U.S. patent application number 14/056058 was filed with the patent office on 2014-02-06 for sheet handling apparatus.
This patent application is currently assigned to KABUSHIKI KAISHA TOSHIBA. The applicant listed for this patent is KABUSHIKI KAISHA TOSHIBA. Invention is credited to Yukio ASARI, Naruaki HIRAMITSU, Yusuke MITSUYA, Yoshihiko NARUOKA, Toru TODORIKI.
Application Number | 20140035221 14/056058 |
Document ID | / |
Family ID | 44582569 |
Filed Date | 2014-02-06 |
United States Patent
Application |
20140035221 |
Kind Code |
A1 |
ASARI; Yukio ; et
al. |
February 6, 2014 |
SHEET HANDLING APPARATUS
Abstract
According to one embodiment, a sheet handling apparatus includes
a conveying path to convey a sheet, a processing portion to perform
a predetermined process on the sheet while conveying the sheet on
the conveying path, a separable roller pair that is arranged at a
certain distance from the processing portion on an upstream side or
a downstream side in conveying direction, the separable roller pair
being adapted to hand over the sheet between the conveying path and
the processing portion by holding the sheet with a nip and
rotating, a separating mechanism to separate the separable roller
pair, and a controller that controls the separating mechanism such
that the separable roller pair is separated before or after
processing is started with the processing portion on a sheet that
is conveyed on the conveying path.
Inventors: |
ASARI; Yukio; (Kanagawa-ken,
JP) ; TODORIKI; Toru; (Kanagawa-ken, JP) ;
MITSUYA; Yusuke; (Kanagawa-ken, JP) ; NARUOKA;
Yoshihiko; (Kanagawa-ken, JP) ; HIRAMITSU;
Naruaki; (Kanagawa-ken, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
KABUSHIKI KAISHA TOSHIBA |
Tokyo |
|
JP |
|
|
Assignee: |
KABUSHIKI KAISHA TOSHIBA
Tokyo
JP
|
Family ID: |
44582569 |
Appl. No.: |
14/056058 |
Filed: |
October 17, 2013 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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13224526 |
Sep 2, 2011 |
8590883 |
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14056058 |
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Current U.S.
Class: |
271/125 |
Current CPC
Class: |
B65H 2404/1442 20130101;
B65H 2511/414 20130101; B65H 2515/10 20130101; B65H 2301/4452
20130101; B65H 5/068 20130101; B65H 7/08 20130101; B65H 2511/224
20130101; B65H 2557/61 20130101; B65H 2701/1916 20130101; B65H
2511/11 20130101; B65H 2511/414 20130101; B65H 2511/224 20130101;
B65H 2701/1311 20130101; B65H 2220/03 20130101; B65H 2220/02
20130101; B65H 2220/03 20130101; B65H 2220/01 20130101; B65H
2220/01 20130101; B65H 2553/82 20130101; B65H 2701/1311 20130101;
B65H 7/02 20130101; B65H 2701/1313 20130101; B65H 2511/11 20130101;
B65H 2701/1313 20130101; B65H 2511/514 20130101; B65H 5/062
20130101; B65H 2220/01 20130101; B65H 2515/10 20130101 |
Class at
Publication: |
271/125 |
International
Class: |
B65H 7/08 20060101
B65H007/08; B65H 5/06 20060101 B65H005/06 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 17, 2010 |
JP |
2010-209249 |
Claims
1-20. (canceled)
21. A sheet handling apparatus comprising: a conveyor conveying a
sheet; a weight measuring apparatus measuring weight of the sheet
fed on the conveyor into the weight measuring apparatus; a
downstream-side separable roller pair that is arranged at a
predetermined distance from the weight measuring apparatus on a
downstream side in a conveying direction, the downstream-side
separable roller pair including rollers having a nip therebetween
and being adapted to hand over the sheet between the conveyor and
the weight measuring apparatus by the nip of the rollers holding
the sheet and rotating the rollers; a separating mechanism
configured to separate the downstream-side separable roller pair;
and a controller configured to control the separating mechanism
wherein the rollers of the downstream-side separable roller pair
are brought into contact after the weight measuring apparatus has
finished weighing the sheet.
22. The apparatus according to claim 21, further comprising: an
upstream-side conveying roller pair having a nip that is arranged
on the upstream side in the conveying direction and spaced from the
weight measuring apparatus, and a downstream-side conveying roller
pair that is arranged on the downstream side in conveying direction
and spaced from the downstream-side separable roller pair; wherein
the weight measuring apparatus is adapted to start the weighing of
a sheet after a trailing edge of the sheet fed into the weight
measuring apparatus has left the nip of the upstream-side conveying
roller pair, and to end the weighing of the sheet before the
leading edge in conveying direction of the sheet reaches the nip of
the downstream-side conveying roller pair.
23. The apparatus according to claim 22, wherein nips of adjacent
roller pairs are spaced apart at a distance that is less than a
minimum length corresponding to a shortest length of the sheet
handling apparatus is configured to convey along the conveyor, and
a distance between the nip of the upstream-side separable roller
pair to the nip of the downstream-side conveying roller pair is
shorter than three times the minimum length.
24. The apparatus according to claim 22, wherein a length in
conveying direction from a nip of the upstream-side conveying
roller pair to a nip of the downstream-side separable roller pair
is shorter than twice a length of the shortest sheet in conveying
direction, the shortest sheet being shortest out of the sheets that
can be processed by the sheet handling apparatus.
25. The apparatus according to claim 22, wherein a length in
conveying direction from a nip of the upstream-side conveying
roller pair to the nip of the downstream-side conveying roller pair
is longer than a length of the sheet being conveyed along the
conveyor.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application is based upon and claims the benefit of
priority from Japanese Patent Application No. 2010-209249, filed on
Sep. 17, 2010, the entire contents of which are incorporated herein
by reference.
FIELD
[0002] Exemplary embodiments described herein relate to a sheet
handling apparatus that measures the weight of the sheets that are
being conveyed consecutively or that corrects the gap between the
trailing edge of a preceding sheet and the leading edge of the
following sheet while the sheets are being conveyed.
BACKGROUND
[0003] Mail handling apparatuses include, for example, a weight
measuring apparatus that measures the weight of mail items that are
conveyed consecutively. In order to measure the weight of each mail
item in a state in which it is unaffected by conveying systems on
its upstream side and its downstream side, the weight measuring
apparatus is built into the mail handling apparatus as a unit that
is independent from the conveying systems. The mail items to be
processed have different lengths in conveying direction.
[0004] In order to reliably hand over and convey the mail items to
this independent unit, the distance between the weight measuring
apparatus and the conveying rollers that are closest to the unit on
the upstream side in conveying direction of the weight measuring
apparatus (these conveying rollers are referred to in the following
as "upstream-side conveying rollers") is set to a distance that is
shorter than the mail item with the shortest length in conveying
direction out of the mail items that are handled by the mail
handling apparatus (such a mail item is referred to in the
following as "shortest mail item"). The length of the shortest mail
item, as the shortest sheet, may be 14 cm in Japan, for example.
The length of the shortest mail item differs for every country.
Similarly, also the distance between the weight measuring apparatus
and the conveying rollers that are closest to the unit on the
downstream side in conveying direction of the weight measuring
apparatus (these conveying rollers are referred to in the following
as "downstream-side conveying rollers") is set to be shorter than
the shortest mail item.
[0005] Moreover, in order to enable the weight measurement of the
mail item whose length is longest in conveying direction out of the
mail items that are handled by the mail handling apparatus (such a
mail item is referred to in the following as "longest mail item"),
it is necessary that the distance between the upstream-side
conveying rollers and the downstream-side conveying rollers is
longer than at least the length in conveying direction of the
longest mail item. That is to say, when measuring the weight of a
mail item, it is necessary that that mail item is unaffected by the
conveying systems on the upstream side and on the downstream side.
The length of the longest mail item, as the longest sheet, may be
23.5 cm in Japan, for example. The length of the longest mail item
differs for every country.
[0006] Thus, it is necessary that the distance between the
upstream-side conveying rollers and the downstream-side conveying
rollers is sufficiently long, so that the weight measurement is
finished in the time after the trailing edge in conveying direction
of the longest mail item that is fed into the weight measuring
apparatus has left the nip of the upstream-side conveying rollers
and the conveying state of that longest mail item has stabilized
until the leading edge in conveying direction of that longest mail
item reaches the downstream-side conveying rollers.
[0007] However, when the distance between the upstream-side
conveying rollers and the downstream-side conveying rollers is made
large, the length of the weight measuring apparatus in conveying
direction necessarily also needs to be made large, which is
problematic for example in cases where the shortest mail item is
conveyed consecutively. That is to say, when the shortest mail
items are conveyed consecutively with a short gap in order to
achieve fast processing, a plurality of the shortest mail items
will be fed simultaneously into the weight measuring apparatus, and
it is not possible anymore to measure the weight of the mail
items.
[0008] While it is conceivable to widen the conveying gap of the
mail items, in this case the number of mail items conveyed per unit
time becomes accordingly lower, and the processing capability of
the mail handling apparatus drops. That is to say, in this case,
high-speed processing of mail items is not possible anymore.
[0009] On the other hand, a method is conceivable in which drops in
the processing capability are averted by branching the conveying
path of the mail items, arranging a plurality (for example two)
weight measuring apparatuses in parallel, and guiding the mail
items alternatingly to these measuring apparatuses. However, in
this case, the manufacturing costs of the apparatus increase, and
also the installation space for the apparatuses increases.
BRIEF DESCRIPTION OF THE DRAWINGS
[0010] FIG. 1 is a front view of a mail handling apparatus
according to a first embodiment;
[0011] FIG. 2 is a diagrammatical view of the handling apparatus in
FIG. 1;
[0012] FIG. 3 is a top view of the handling apparatus in FIG.
1;
[0013] FIG. 4 is a block diagram of the control system controlling
the operation of the handling apparatus in FIG. 1;
[0014] FIGS. 5A to 5E are operation diagrams illustrating the
operation of the upstream-side separable roller pair in FIG. 3;
[0015] FIGS. 6A to 6H are operation diagrams illustrating the
operation of the handling apparatus in FIG. 1;
[0016] FIG. 7 is a flowchart illustrating the operation of the
handling apparatus in FIG. 1 together with FIG. 6;
[0017] FIG. 8 is diagram, viewed from the front, of a mail handling
apparatus according to a second embodiment;
[0018] FIGS. 9A to 9H are operation diagrams illustrating the
operation of the handling apparatus in FIG. 8;
[0019] FIG. 10 is a flowchart illustrating the operation of the
handling apparatus in FIG. 8 together with FIG. 9;
[0020] FIG. 11 is top view, viewed from above, of a mail handling
apparatus according to a third embodiment;
[0021] FIGS. 12A to 12F are operation diagrams illustrating a first
operation example of the handling apparatus in FIG. 11;
[0022] FIGS. 13A to 13J are operation diagrams illustrating a first
operation example of the handling apparatus in FIG. 11;
[0023] FIGS. 14A to 14F are operation diagrams illustrating a
second operation example of the handling apparatus in FIG. 11;
[0024] FIGS. 15A to 15H are operation diagrams illustrating a
second operation example of the handling apparatus in FIG. 11;
[0025] FIGS. 16A to 16I are operation diagrams illustrating a third
operation example of the handling apparatus in FIG. 11;
[0026] FIGS. 17A to 17I are operation diagrams illustrating a
fourth operation example of the handling apparatus in FIG. 11;
[0027] FIG. 18 is a top view showing a simplified apparatus
configuration of the handling apparatus in FIG. 3;
[0028] FIG. 19 is a top view showing a simplified apparatus
configuration of the handling apparatus in FIG. 9;
[0029] FIG. 20 is a diagrammatic view, viewed from the front,
showing a mail handling apparatus according to a fourth
embodiment;
[0030] FIGS. 21A to 21E are operation diagrams illustrating the
operation of the handling apparatus in FIG. 20;
[0031] FIG. 22 is a diagrammatic view, viewed from the front,
showing a mail handling apparatus according to a fifth
embodiment;
[0032] FIGS. 23A to 23E are operation diagrams illustrating the
operation of the handling apparatus in FIG. 22;
[0033] FIG. 24 is a diagrammatic view, viewed from the front,
showing a mail handling apparatus according to a sixth
embodiment;
[0034] FIGS. 25A to 25G are operation diagrams illustrating a first
operation example of the handling apparatus in FIG. 24; and
[0035] FIGS. 26A to 26E are operation diagrams illustrating a
second operation example of the handling apparatus in FIG. 24.
DETAILED DESCRIPTION
[0036] In general, according to one embodiment, there is provided a
sheet handling apparatus including: a conveying path to convey a
sheet; a processing portion to perform a predetermined process on
the sheet while conveying the sheet on the conveying path; a
separable roller pair that is arranged at a certain distance from
the processing portion on an upstream side or a downstream side in
conveying direction, the separable roller pair being adapted to
hand over the sheet between the conveying path and the processing
portion by holding the sheet with a nip and rotating; a separating
mechanism to separate the separable roller pair; and a controller
that controls the separating mechanism such that the separable
roller pair is separated before or after processing is started with
the processing portion on the sheet that is conveyed on the
conveying path.
[0037] Referring to the accompanying drawings, the following is a
detailed explanation of one embodiment. FIG. 1 is a front view
showing, as an example of a sheet handling apparatus, the structure
of the principal parts of a mail handling apparatus 100 (referred
to below simply as "handling apparatus 100") according to a first
embodiment, as viewed from the side. FIG. 2 shows a diagrammatical
view of the handling apparatus 100 in FIG. 1, and FIG. 3 shows a
top view of the handling apparatus 100 in FIG. 1, as viewed from
above. Moreover, FIG. 4 shows a block diagram of the control system
controlling the operation of the handling apparatus 100 in FIG. 1.
Here, an apparatus that handles mail items M serving as sheets is
explained, but the sheets to be handled are not limited to mail
items M.
[0038] The handling apparatus 100 of this embodiment includes a
weight measuring apparatus 10 (processing portion) through which
mail items M (sheets) that are conveyed consecutively in an upright
orientation in arrow direction T are passed along a conveying path
2, and measures the weight of the mail items M. Moreover, the
handling apparatus 100 includes an upstream-side separable roller
pair 4 at a position that is spaced apart by a certain distance
from the weight measuring apparatus 10 on the upstream side in
conveying direction of the weight measuring apparatus 10. A
separable roller pair is a roller pair that can be switched, e.g.
by a separating mechanism, between two states, namely a first state
in which the two rollers of the roller pair are in contact with
each other forming a nip, and a second state in which the two
rollers of the roller pair are spaced apart (i.e. separated), such
that they impart substantially no force on a sheet or mail item
passing between them. Furthermore, the handling apparatus 100
includes a downstream-side conveying roller pair 6 at a position
that is spaced apart by a certain distance from the weight
measuring apparatus 10 on the downstream side in conveying
direction of the weight measuring apparatus 10. It should be noted
that an upstream-side conveying roller pair 8 (shown only in FIG.
3) is arranged at a position that is spaced apart by a certain
distance from the upstream-side weight measuring apparatus 10
further on the upstream side of the upstream-side separable roller
pair 4.
[0039] That is to say, the mail items M that are fed consecutively
into the handling apparatus 100 are conveyed at a certain speed in
the arrow direction T on the conveying path 2, and pass along the
upstream-side conveying roller pair 8, the upstream-side separable
roller pair 4, the weight measuring apparatus 10, and the
downstream-side conveying roller pair 6 in that order. In order to
stabilize their conveying orientation, the mail items M are
conveyed in their longitudinal direction. As explained further
below, the weight measuring apparatus 10 is arranged to be
mechanically independent from the upstream-side and the
downstream-side conveying systems of the handling apparatus 100.
Therefore, the weight of the mail items M fed into the weight
measuring apparatus 10 can be measured with high precision without
being affected by the conveying systems.
[0040] The weight measuring apparatus 10 includes two holding
roller pairs 3 and 5 that convey a mail item M in the arrow
direction T on the conveying path 2, while restraining the mail
item M by rotating while clamping the mail item M in the nip. The
respective rotation shafts 3a and 5a of the two holding roller
pairs 3 and 5 are arranged in the vertical direction and their
lower ends are held rotatively by a base plate 1 that extends in
the horizontal direction. Moreover, the two holding roller pairs 3
and 5 each include two roller portions that are spaced apart
vertically along the rotation shafts 3a and 5a. These two holding
roller pairs 3 and 5 have substantially the same structure.
[0041] To explain the structure of the holding roller pair 3 on the
upstream side in conveying direction in more detail, a holding
roller 3F that is arranged on the front side of the apparatus with
respect to the conveying path 2 (below the conveying path in FIG.
3) includes two roller portions 3FL and 3FH that are made of solid
rubber rollers that are spaced apart vertically along the rotation
shaft 3a. A motor 11 is connected to the rotation shaft 3a of the
front-side holding roller 3F, and this holding roller 3F functions
as a driving roller. It should be noted that also the rotation
shaft 5a of the holding roller 5F on the front side of the
downstream-side holding roller pair 5 is connected to this motor
11, and also this holding roller 5F functions as a driving
roller.
[0042] Also the holding roller 3R that is arranged on the rear side
of the apparatus with respect to the conveying path 2 (above the
conveying path in FIG. 3) includes two roller portions 3RL and 3RH
that are spaced apart vertically along the rotation shaft 3a. These
two roller portions 3RL and 3RH are arranged such that they
respectively contact the outer circumferential surfaces of the two
roller portions 3FL and 3FH of the opposing holding roller 3F
across the conveying path 2. The two roller portions 3RL and 3RH
each have a two-layer structure including a sponge layer on the
outer side of their metal core, and a rubber layer as the outermost
layer. The rear-side holding roller 3R functions as a driven roller
that follows the front-side holding roller 3F. It should be noted
that also the rear-side holding roller 5R of the holding roller
pair 5 on the downstream-side functions as a driven roller that
contacts and follows the rotation of the front-side holding roller
5F.
[0043] That is to say, in this pair of holding rollers 3F and 3R
(5F and 5R), the respective rotation shafts 3a are held rotatively
with respect to the base plate 1, so that their axial distance is
constant, and in order to allow the mail items M that are fed
between the two to pass through them, the roller portion of at
least one of the holding rollers should be elastically deformable.
Therefore, in the present embodiment, an elastically deformable
roller with two-layer structure is used for the rear-side holding
roller 3R. It should be noted that also the holding roller pair 5
on the downstream side has the same structure as the holding
rollers 3 on the upstream side, so that its further detailed
explanation is omitted.
[0044] That is to say, the weight of the mail items M that are
being conveyed while clamped in the nip of the two holding roller
pairs 3 and 5 is supported by the base plate 1. In the present
embodiment, the base plate 1 of the weight measuring apparatus 10
is independent from the conveying systems, so that if no external
force from the surrounding conveying systems acts on the mail item
M that is being held by any of the holding rollers 3 and 5, then
the weight of the mail item M can be measured accurately through
the base plate 1.
[0045] That is to say, as shown in FIG. 2, the weight measuring
apparatus 10 includes a force sensor 7 (see U.S. Pat. No.
7,219,561) at a position where the base plate 1 is supported by a
casing 10a of the apparatus. Moreover, this force sensor 7 is
connected to a control board 9. The weight of the mail items M
passing through the weight measuring apparatus 10 is detected by
the control board 9 via the force sensor 7.
[0046] The upstream-side separable roller pair 4 that is arranged
on the upstream side of the weight measuring apparatus 10 includes
a driving roller 4F that is arranged on the front side of the
apparatus with respect to the conveying path 2, and a driven roller
4R that is arranged on the rear side of the conveying path 2 such
that it can be separated from the driving roller 4F.
[0047] The driving roller 4F has substantially the same structure
as the holding roller 3F on the front side of the above-described
weight measuring apparatus 10, and the driving force of a motor 14
is transmitted to its rotation shaft 4a via a plurality of pulleys
12 and timing belts 13. It should be noted that the driving force
of this motor 14 is transmitted also to a front-side driving roller
6F of the downstream-side conveying roller pair 6 and a front-side
driving roller 8F of the upstream-side conveying roller pair 8,
which are explained later.
[0048] On the other hand, the rear-side driven roller 4R of the
upstream-side separable roller pair 4 has substantially the same
structure as the rear-side holding roller 3R of the above-described
weight measuring apparatus 10, and is attached in such a manner
that it can be moved by a later-described separating mechanism 20
(FIG. 5) in a direction separating it with respect to the conveying
path 2. That is to say, in a state in which this separating
mechanism 20 is operated and the driven roller 4R contacts the
driving roller 4F, a conveying force can be imparted on the mail
item M, and in a state in which the driven roller 4R is spaced
apart from the driving roller 4F, no conveying force can be
imparted on the mail item M.
[0049] Furthermore, the downstream-side conveying roller pair 6
that is arranged on the downstream side of the weight measuring
apparatus 10 and the upstream-side conveying roller pair 8 that is
arranged further on the upstream side of the upstream-side
separable roller pair 4 have substantially the same structure as
the holding roller pairs 3 and 5 of the above-described weight
measuring apparatus 10. Therefore, their detailed explanation has
been omitted.
[0050] As shown in FIG. 4, a plurality of sensors S0 to S6 that are
spaced apart along the conveying path 2 are connected to a
controller 30 that controls the operation of the handling apparatus
100. Each of the sensors includes a light-emitting portion and a
light-receiving portion that are respectively arranged at positions
on opposite sides of the conveying path 2. Moreover, the sensors
are arranged at such positions that the optical axis connecting the
light-emitting portion with the light-receiving portion intersects
the conveying path 2.
[0051] In the present embodiment, as shown in FIG. 1, each of the
sensors S0 to S6 includes two sensors, namely a sensor whose
optical axis passes near the lower edge of the mail items M and a
sensor whose optical axis passes near the middle or the upper edge
of the mail items M. The controller 30 senses the passage of a mail
item M as a result of the optical axis of the sensors being blocked
by the mail item M. That is to say, the sensors sense the passage
of the front edge in conveying direction and the rear edge in
conveying direction of the mail items M at their respective
positions.
[0052] The sensor S0, which is arranged furthest upstream on the
conveying path 2, is arranged at such a position that its optical
axis intersects the conveying path 2 at a position at a distance on
the upstream side in conveying direction from the nip of the
upstream-side conveying roller pair 8. Moreover, the sensor S1 next
to this sensor S0 on the downstream side in conveying direction is
arranged such that its optical axis intersects the conveying path 2
near the nip of the upstream-side conveying roller pair 8. Also,
the sensor S2 next to this sensor S1 on the downstream side in
conveying direction is arranged such that its optical axis
intersects the conveying path 2 near the nip of the upstream-side
separable roller pair 4. Also, the sensor S3 next to this sensor S2
on the downstream side in conveying direction is arranged such that
its optical axis intersects the conveying path 2 near the nip of
the holding roller pair 3 on the upstream side of the weight
measuring apparatus 10. Also, the sensor S4 next to this sensor S3
on the downstream side in conveying direction is arranged at such a
position that its optical axis intersects the conveying path 2 near
the nip of the holding roller pair 5 on the downstream side of the
weight measuring apparatus 10. Furthermore, the sensor S5 next to
this sensor S4 on the downstream side in conveying direction is
arranged at such a position that its optical axis intersects the
conveying path 2 near the nip of the downstream-side conveying
roller pair 6.
[0053] The controller 30 is connected to the motor 14 for driving
the driving roller 4F of the upstream-side separable roller pair 4,
the driving roller 6F of the downstream-side conveying roller pair
6 and the driving roller 8F of the upstream-side conveying roller
pair 8, the motor 11 for driving the holding roller 3F on the front
side of the upstream-side holding roller pair 3 and the holding
roller 5F on the front side of the downstream-side holding roller
pair 5 of the weight measuring apparatus 10, the separating
mechanism 20 (upstream-side separating mechanism) for separating
the driven roller 4R of the upstream-side separable roller pair 4
from the driving roller 4F, and the control board 9 controlling the
force sensor 7 of the weight measuring apparatus 10.
[0054] In the present embodiment, in order to hand over mail items
M between the plurality of roller pairs 8, 4, 3, 5 and 6 that are
arranged along the conveying path 2, the distance between the nips
among adjacent roller pairs is set in accordance with the size of
the mail items whose length in conveying direction is shortest out
of the mail items M that are processed by the handling apparatus
100 (in the following, these mail items are referred to as
"shortest mail items Mmin"). Here, the length in conveying
direction of the shortest mail item Mmin is set to 127 mm.
[0055] More specifically, as shown in FIG. 2, in the present
embodiment, the distance between the nips of the roller pairs 4, 3,
5 and 6 that are spaced apart at a certain distance along the
conveying path 2 is set to 120 mm. Thus, by making the distance
between the nips shorter than the length of the shortest mail item
Mmin in conveying direction, it is possible to hand over any mail
item M among the roller pairs, regardless of the length of the
conveyed mail item M, and all mail items M can be conveyed
reliably. That is to say, the length in conveying direction from
the nip of the upstream-side separable roller pair 4 to the nip of
the downstream-side conveying roller pair 6 is set to be shorter
than three times the length Mmin of the shortest mail item in
conveying direction.
[0056] However, if there is a weight measuring apparatus 10 in an
intermediate section of the conveying path 2, as in the case of the
handling apparatus 100 of the present embodiment, when the distance
between the nips of the plurality of roller pairs for handing over
and conveying the mail items M is shortened in accordance with the
shortest mail item Mmin, an external force from the conveying
mechanisms on the upstream-side and/or downstream-side of the
weight measuring apparatus 10 tends to be imparted on the mail item
M whose weight is being measured, and there is the possibility that
precise weight measurement is not possible anymore. In particular,
if the weight of the mail items whose length in conveying direction
is longest, out of the mail items M that are processed by the
handling apparatus 100 (in the following such a mail item is
referred to as "longest mail item Mmax") is measured, then the time
for which this longest mail item Mmax is held only by the weight
measuring apparatus 10 becomes very short, and the necessary
calculation time that is required by the weight measurement cannot
be ensured anymore.
[0057] Therefore, in the present embodiment, the roller pair that
is arranged next to the upstream side of the weight measuring
apparatus 10 can be separated with respect to the conveying path 2.
The structure and the operation of the separating mechanism 20 of
the upstream-side separable roller pair 4 is explained with
reference to FIG. 5.
[0058] The separating mechanism 20 includes a slide arm 22, a
sleeve 24, a cam arm 26, a support pin 28 and a motor 29. One end
of the slide arm 22 is rotatively attached to the rotation shaft 4a
of the rear-side driven roller 4R of the upstream-side separable
roller pair 4. The sleeve 24 supports this slide arm 22 movably in
the direction of the arrow S in the drawing (in the direction in
which the rotation shafts of the driving roller 4F and the driven
roller 4R are lined up). One end of the cam arm 26 is turnably
linked to the other end of the slide arm 22. The other end of the
cam arm 26 is turnably linked to the support pin 28 at a position
that is shifted from the center of a rotation plate 27. The motor
29 rotates this rotation plate 27.
[0059] Now, when the motor 29 is rotated in the direction of the
arrow R in the drawing, then the other end of the cam arm 26 is
rotated by rotating the rotation plate 27 once as shown in FIGS. 5A
to 5E, and the slide arm 22 coupled to the front end of the cam arm
26 slides in the direction of the arrow S along the sleeve 24.
Thus, the driven roller 4R can be separated from the driving roller
4F. Here, a motor is used for the separating mechanism 20 for
separating the driven roller 4R from the driving roller 4F, but it
is also possible to use another actuator, such as a solenoid, for
example.
[0060] Referring to the FIGS. 6 and 7, the following is an
explanation of the operation of the above-explained handling
apparatus 100. FIG. 6 is an operation diagram illustrating the
operation of the handling apparatus 100, and FIG. 7 is a flowchart
illustrating the operation of the handling apparatus 100.
[0061] In a standby state prior to the mail item M being fed into
the handling apparatus 100, the controller 30 rotates the motor 29
of the separating mechanism 20 such that the driven roller 4R of
the upstream-side separable roller pair 4 contacts the driving
roller 4F. Moreover, in the standby state, the controller 30 causes
the motors 11 and 14 to rotate, thus rotating the two holding
roller pairs 3 and 5 of the weight measuring apparatus 10, the
upstream-side conveying roller pair 8, the upstream-side separable
roller pair 4 and the downstream-side conveying roller pair 6 at
constant speed. It should be noted that the controller 30 monitors
the conveying position of the mail item M that is fed on the
conveying path 2 to the handing apparatus 100 based on the output
of the plurality of sensors S0 to S6.
[0062] Moreover, as a preparation before measuring the weight of
the conveyed mail item M, the controller 30 measures the weight of
the weight measuring apparatus 10 with the force sensor 7. That is
to say, the controller 30 measures, in advance, the weight of the
weight measuring apparatus 10 when no mail item M is being
conveyed, and measures the weight of the mail item M by subtracting
this from the weight of the weight measuring apparatus 10 when the
mail item M is being conveyed.
[0063] When a plurality of mail items M is conveyed consecutively
on the conveying path 2 and fed into the handling apparatus 100,
then, based on the output of the sensor S3, the controller 30 first
judges whether the mail item M to be processed is clamped by the
nip of the holding roller pair 3 on the upstream side of the weight
measuring apparatus 10 (FIG. 7, Step 1). For example, in the state
in FIG. 6A, the leading edge in conveying direction of the mail
item M has already passed the nip of the holding roller pair 3.
[0064] If it is judged in Step 1 that the leading edge in conveying
direction of the mail item M is held by the weight measuring
apparatus 10 (Step 1: YES), then the controller 30 judges, based on
the output of the sensor S1, whether the trailing edge in conveying
direction of the mail item M has passed the nip of the
upstream-side conveying roller pair 8 (Step 2). For example, if the
mail item is a shortest mail item Mmin, then, at the point in time
when it is sensed in Step 1 that the leading edge in conveying
direction of the shortest mail item Mmin is held by the holding
roller pair 3, the trailing edge in conveying direction of the
shortest mail item Mmin has already passed the nip of the
upstream-side conveying roller pair 8.
[0065] If it is judged in Step 2 that the trailing edge in
conveying direction of the mail item M has passed the nip of the
upstream-side conveying roller pair 8 (Step 2: YES), then the
controller 30 causes the motor 29 of the separating mechanism 20 to
rotate, to space apart the driven roller 4R of the upstream-side
separable roller pair 4 from the driving roller 4F and open the
upstream-side separable roller pair 4 (Step 3). This state is shown
in FIG. 6B.
[0066] Then, after the controller 30 has opened the upstream-side
separable roller pair 4 in Step 3, the weighing of the weight of
the mail item M with the force sensor 7 of the weight measuring
apparatus 10 is started (Step 4). While the weight of the mail item
M is being measured, the mail item M is conveyed, as shown in FIGS.
6B to 6D. In the states shown in FIGS. 6B, 6C and 6D, there are no
other roller pairs clamping the mail item M other than the two
holding roller pairs 3 and 5 of the weight measuring apparatus 10,
so that the weight of the mail item M can be measured with high
precision without imparting an undesired force from outside on the
mail item M.
[0067] After this, based on the output of the sensor S5, the
controller 30 judges whether the front edge in conveying direction
of the mail item M is clamped in the nip of the downstream-side
conveying roller pair 6 (Step 6). Then, if it is judged in Step 6
that the front edge in conveying direction of the mail item M is
clamped by the nip of the downstream-side conveying roller pair 6
(state in FIG. 6E) (Step 6: YES), or measuring the weight of the
mail item M has finished (Step 5: YES), then the controller 30
rotates the motor 29 of the separating mechanism 20 such that the
upstream-side separable roller pair 4 is closed (Step 7).
[0068] As described above, with the present embodiment, the
controller 30 opens the upstream-side separable roller pair 4 as in
Step 3 at the point in time when it is judged in Step 2 that the
trailing edge in conveying direction of the mail item M has passed
the nip of the upstream-side conveying roller pair 8, so that the
measurement of the weight of the mail item M can be started before
the trailing end in conveying direction of the mail item M passes
the nip of the upstream-side separable roller pair 4 (from the
point in time of FIG. 6B).
[0069] That is to say, with the present embodiment, a shortest mail
item Mmin can be reliably handed over to the holding roller pair 3
on the upstream side of the weight measuring apparatus 10 by
closing the upstream-side separable roller pair 4, and if for
example the weight of a longest mail item Mmax is to be measured,
then the weight measurement can be started at a timing that is
earlier than usual (that is, if there is no opening and closing of
the upstream-side separable roller pair 4) by opening the
upstream-side separable roller pair 4 at the above-described
timing, so that the necessary processing time for the weight
measurement can be ensured. Thus, a weight measurement with higher
precision becomes possible.
[0070] Moreover, with the present embodiment, since it is
sufficient to make the simple configurational change of enabling
opening and closing of the roller pair (the upstream-side separable
roller pair 4 in the present embodiment) that is next to the weight
measuring apparatus 10 on the upstream side in conveying direction,
a large-scale redesign of the apparatus is unnecessary, so that
also the manufacturing costs of the apparatus can be kept low.
[0071] With the present embodiment, if the weight measurement of
the mail item M is finished before the controller 30 has sensed in
Step 6 that the leading edge in conveying direction of the mail
item M has reached the nip of the downstream-side conveying roller
pair 6 (Step 6: NO; Step 5: YES), then the upstream-side separable
roller pair 4 is closed at this point in time, so that the mail
items M can be reliably conveyed in a stable manner. That is to
say, if the weight measurement of the mail item M is finished, then
the measurement result is unaffected, even if a force is exerted
from outside on the mail item M.
[0072] Furthermore, with the present embodiment, if the trailing
edge in conveying direction of the mail item M passes the
upstream-side separable roller pair 4 after the upstream-side
separable roller pair 4 has been closed in Step 7, then it becomes
immediately possible to hand over the next mail item M to the
upstream-side separable roller pair 4, so that there is no
necessity to widen the gap between the mail items M, and there is
no necessity to branch the conveying path into two directions and
to provide two weight measuring apparatuses 10 in parallel, so that
the installation space of the apparatus does not become large.
[0073] FIG. 8 is a diagrammatical view, taken from the front and
corresponding to FIG. 2, of a mail handling apparatus 110 according
to a second embodiment (referred to below simply as "handling
apparatus 110"). In this handling apparatus 110 according to the
second embodiment, the upstream-side conveying roller pair 8 is
arranged at the position of the upstream-side separable roller pair
4 of the above-described handling apparatus 100 of the first
embodiment, a downstream-side separable roller pair 40 is newly
provided at the position of the downstream-side conveying roller
pair 6 of the handling apparatus 100 of the first embodiment, and
the downstream-side conveying roller pair 6 (not shown in the
drawings) is arranged further on the downstream side of the
downstream-side separable roller pair 40. Otherwise, the handling
apparatus 110 has the same configuration as the handling apparatus
100 of the above-described first embodiment. Thus, structural
elements having the same function as those in the above-described
handling apparatus 100 of the first embodiment are assigned the
same reference numerals and their further explanation has been
omitted.
[0074] That is to say, a mail item M that is conveyed on the
conveying path 2 of this handling apparatus 110 in the arrow
direction T in the drawing is passed along the upstream-side
conveying roller pair 8, the upstream-side holding roller pair 3 of
the weight measuring apparatus 10, the downstream-side holding
roller pair 5 of the weight measuring apparatus 10, the
downstream-side separable roller pair 40, and the downstream-side
conveying roller pair 6 in that order.
[0075] It should be noted that the downstream-side separable roller
pair 40 has substantially the same structure as the above-described
upstream-side separable roller pair 4, and is opened and closed by
a separating mechanism 20 (downstream-side separating mechanism)
that is similar to that in the above-described first embodiment.
Moreover, also in the present embodiment, the distance between the
nips of the roller pairs 8, 3, 5, 40 and 6 that are lined up along
the conveying path 2 is set to 120 mm. That is to say, the length
in conveying direction from the nip of the upstream-side conveying
roller pair 8 to the nip of the downstream-side separable roller
pair 40 is shorter than three times the length in conveying
direction of the shortest sheet Mmin.
[0076] Referring to FIGS. 9 and 10, the following is an explanation
of the operation of the handling apparatus 110 of the second
embodiment. FIG. 9 is an operation diagram illustrating the
operation of the handling apparatus 110, and FIG. 10 is a flowchart
illustrating the operation of the handling apparatus 110.
[0077] In a standby state prior to the mail item M being fed into
the handling apparatus 110, the controller 30 rotates the motors 11
and 14 so that the two holding roller pairs 3 and 5 of the weight
measuring apparatus 10, the upstream-side conveying roller pair 8,
the downstream-side separable roller pair 40 and the
downstream-side conveying roller pair 6 are rotated at a certain
speed. At this time, the downstream-side separable roller pair 40
may be open or closed. It should be noted that the controller 30
monitors the conveying position of the mail item M that is fed on
the conveying path 2 to the handing apparatus 110 based on the
output of the plurality of sensors S0 to S6.
[0078] Moreover, as a preparation before measuring the weight of
the conveyed mail item M, the controller 30 measures the weight of
the weight measuring apparatus 10 with the force sensor 7. That is
to say, the controller 30 measures, in advance, the weight of the
weight measuring apparatus 10 when no mail item M is being
conveyed, and measures the weight of the mail item M by subtracting
this from the weight of the weight measuring apparatus 10 when the
mail item M is being conveyed.
[0079] When a plurality of mail items M is conveyed consecutively
on the conveying path 2 and fed into the handling apparatus 110,
then, based on the output of the sensor S3, the controller 30 first
judges whether the mail item M to be processed is clamped by the
nip of the holding roller pair 3 on the upstream side of the weight
measuring apparatus 10 (FIG. 10, Step 1). For example, in the state
in FIG. 9A, the leading edge in conveying direction of the mail
item M has already passed the nip of the holding roller pair 3.
[0080] If it is judged in Step 1 that the leading edge in conveying
direction of the mail item M is held by the holding roller pair 3
on the upstream side of the weight measuring apparatus 10 (Step 1:
YES), then the controller 30 judges, based on the output of the
sensor S2, whether the trailing edge in conveying direction of the
mail item M has passed the nip of the upstream-side conveying
roller pair 8 (Step 3). For example, if the mail item is a shortest
mail item Mmin, then, immediately after it has been sensed in Step
1 that the leading edge in conveying direction of the shortest mail
item Mmin is held by the holding roller pair 3, the trailing edge
in conveying direction of the shortest mail item Mmin passes the
optical axis of the sensor S2.
[0081] If it is judged in Step 3 that the trailing edge in
conveying direction of the mail item M has passed the nip of the
upstream-side conveying roller pair 8 (state in FIG. 9E) (Step 3:
YES), then the controller 30 causes the motor 29 of the separating
mechanism 20 to rotate, to space apart the driven roller 4R of the
downstream-side separable roller pair 40 from the driving roller 4F
and open the downstream-side separable roller pair 40 (Step 4).
[0082] Alternatively, if, as shown for example in FIG. 9D, the
leading edge in conveying direction of the mail item M blocks the
optical axis of the sensor S5 before it is sensed in Step 3 that
the trailing edge in conveying direction of the mail item M has
passed the optical axis of the sensor S2 (Step 3: NO; Step 2: YES),
then the controller 30 opens the downstream-side separable roller
pair 40 at that point in time (Step 4).
[0083] In the present embodiment, assuming that a plurality of mail
items M are conveyed consecutively with a comparatively short gap,
the downstream-side separable roller pair 40 is closed in a state
in which the passage of the trailing edge in conveying direction of
the mail item M is sensed in Step 3 with the sensor S2, or in a
state in which the passage of the leading edge in conveying
direction of the mail item M is sensed in Step 2 with the sensor
S5, as shown in FIGS. 9A to 9C, but if the gap to the preceding
conveyed mail item M is comparatively large, then it is also
possible to open the downstream-side separable roller pair 40 at an
earlier timing.
[0084] After opening the downstream-side separable roller pair 40
in Step 4, or, if the downstream-side separable roller pair 40 is
already open, after the trailing edge in conveying direction of the
mail item M has passed the nip of the upstream-side conveying
roller pair 8 in Step 3, the controller 30 starts the weight
measurement of the mail item M with the force sensor 7 of the
weight measuring apparatus 10 (Step 5).
[0085] While the weight of the mail item M is measured, the mail
item M is conveyed in a state in which, as shown for example in
FIGS. 9E and 9F, no external force is imparted on it from any
roller pairs other than the holding roller pairs 3 and 5 of the
weight measuring apparatus 10. Thus, in the state of FIG. 9E and
9F, there are no other roller pairs clamping the mail item M other
than the two holding roller pairs 3 and 5 of the weight measuring
apparatus 10, so that the weight of the mail item M can be measured
with high precision.
[0086] After this, based on the output of the sensor S6, the
controller 30 judges whether the front edge in conveying direction
of the mail item M is clamped in the nip of the downstream-side
conveying roller pair 6 (Step 7). Then, if it is judged in Step 7
that the front edge in conveying direction of the mail item M is
clamped by the nip of the downstream-side conveying roller pair 6
(state in FIG. 9G) (Step 7: YES), or measuring the weight of the
mail item M has finished before it has been sensed in Step 7 that
the front edge in conveying direction of the mail item M has passed
the optical axis of the sensor S6 (Step 7: NO; Step 6: YES), then
the controller 30 rotates the motor 29 of the separating mechanism
20 such that the downstream-side separable roller pair 40 is closed
(Step 8).
[0087] As described above, with the present embodiment, the
controller 30 opens the downstream-side separable roller pair 40 as
in Step 4 at the time when it is judged in Step 3 that the trailing
edge in conveying direction of the mail item M has passed the nip
of the upstream-side conveying roller pair 8, or before it is
judged in Step 3 that the trailing edge in conveying direction of
the mail item M has passed the nip of the upstream-side conveying
roller pair 8, so that when the measurement of the weight of the
mail item M is started in Step 5, the downstream-side separable
roller pair 40 does not impart any conveying force on the mail item
M and a precise weight measurement becomes possible.
[0088] In particular, if for example the longest mail item Mmax is
processed, the downstream-side separable roller pair 40 is opened
at the point in time when the controller 30 senses in Step 2 that
the leading edge in conveying direction of this longest mail item
Mmax has passed the nip of the downstream-side separable roller
pair 40, before it is sensed in Step 3 that the trailing edge in
conveying direction of this longest mail item Mmax has passed the
nip of the upstream-side conveying roller pair 8 (state shown in
FIG. 9D), so that the downstream-side separable roller pair 40 can
be opened in advance at a timing slight before the weight
measurement of the longest mail item Mmax starts (at the time of
FIG. 9D), and the conveying state of the longest mail item Mmax can
be stabilized before the weight measurement of the longest mail
item Mmax starts.
[0089] That is to say, with the present embodiment, a shortest mail
item Mmin can be reliably handed over from the holding roller pair
5 on the downstream side of the weight measuring apparatus 10 to
the downstream-side separable roller pair 40 by closing the
downstream-side separable roller pair 40, and if for example the
weight of a longest mail item Mmax is to be measured, then a time
for the weight measurement can be ensured that is longer than usual
(that is, if there is no opening and closing of the downstream-side
separable roller pair 40) by opening the downstream-side separable
roller pair 40 at the above-described timing, and a sufficient
processing time for the weight measurement can be ensured. Thus, a
weight measurement with higher precision becomes possible.
[0090] Moreover, with the present embodiment, since it is
sufficient to make the simple configurational change of enabling
opening and closing of the roller pair (the downstream-side
separable roller pair 40 in the present embodiment) that is next to
the weight measuring apparatus 10 on the downstream side in
conveying direction, the manufacturing costs of the apparatus can
be kept low.
[0091] With the present embodiment, if the weight measurement of
the mail item M is finished before the controller 30 has sensed in
Step 7 that the leading edge in conveying direction of the mail
item M has reached the nip of the downstream-side conveying roller
pair 6, then the downstream-side separable roller pair 40 is
closed, so that the mail items M can be reliably conveyed in a
stable manner.
[0092] Furthermore, with the present embodiment, after the weight
measurement of the postal item M has been finished, it becomes
immediately possible to hand over the next mail item M to the
holding roller pair 3 on the upstream side of the weight measuring
apparatus 10, so that there is no necessity to widen the gap
between the mail items M, and there is no necessity to branch the
conveying path into two directions and to provide two weight
measuring apparatuses 10 in parallel, so that the installation
space of the apparatus does not become large.
[0093] FIG. 11 is a top view, taken from above, of a mail handling
apparatus 120 according to a third embodiment (referred to below
simply as "handling apparatus 120"). This handling apparatus 120
has a structure that combines the above-described handling
apparatus 100 of the first embodiment and the handling apparatus
110 of the second embodiment. That is to say, a mail item M that is
conveyed on the conveying path 2 in the arrow direction T in the
drawing is passed along the upstream-side conveying roller pair 8,
the upstream-side separable roller pair 4, the upstream-side
holding roller pair 3 of the weight measuring apparatus 10, the
downstream-side holding roller pair 5 of the weight measuring
apparatus 10, the downstream-side separable roller pair 40, and the
downstream-side conveying roller pair 6 in that order. It should be
noted that the length in conveying direction from the nip of the
upstream-side separable roller pair 4 to the nip of the
downstream-side conveying roller pair 6 is shorter than four times
the length in conveying direction of the shortest mail item (sheet)
Mmin.
[0094] The upstream-side separable roller pair 4 can be opened and
closed by a separating mechanism 20 (here, referred to as
"upstream-side separating mechanism 20U"), whereas the
downstream-side separable roller pair 40 can be opened and closed
by a separating mechanism 20 (here, referred to as "downstream-side
separating mechanism 20D"). Based on the output of the sensor S0,
the controller 30 detects the length in conveying direction of the
conveyed mail item M, and based on the output signal from the
sensors S1 to S6, the controller 30 controls the upstream-side
separating mechanism 20U and the downstream-side separating
mechanism 20D, opening and closing the upstream-side separable
roller pair 4 and the downstream-side separable roller pair 40.
Here, the same reference numerals are assigned to structural
elements having the same function as those in the handling
apparatus 100 of the first embodiment or the handling apparatus 110
of the second embodiment described above, and their further
explanation has been omitted.
[0095] Referring to FIGS. 12 to 17, the following is an explanation
of several operation examples of the handling apparatus 120 of the
present embodiment. First of all, as a first operation example, the
case that a mail item M whose length in conveying direction is
relatively short is conveyed and processed is explained with
reference to FIGS. 12 and 13. As shown in FIG. 12A, when, after the
front edge in conveying direction of the mail item M conveyed in
arrow direction T on the conveying path 2 has passed the sensor S3
and the mail item M has been fed into the weight measuring
apparatus 10, the trailing edge in conveying direction of the mail
item M passes the sensor S2 (state shown in FIG. 12B), the weight
measurement of the mail item M with the weight measuring apparatus
10 becomes possible. At this time, since the length of the mail
item M measured in advance by the sensor S0 is relatively short,
the upstream-side separable roller pair 4 stays closed. That is to
say, in this case, the upstream-side separable roller pair 4
functions in the same manner as the other conveying roller
pairs.
[0096] After this, the mail item M is conveyed further and passes
the weight measuring apparatus 10, and until the leading edge in
conveying direction of the mail item M is detected by the sensor S5
(state shown in FIG. 12D), the weight of the mail item M is
measured. In this situation, the length in conveying direction of
the mail item M is relatively short, so that the weight measurement
of the mail item M is finished before the leading edge in conveying
direction of the mail item reaches the sensor S5.
[0097] For this reason, when the leading edge in conveying
direction of the mail item M reaches the sensor S5, the
downstream-side separable roller pair 40 stays closed (state shown
in FIG. 12D). In other words, before the leading edge in conveying
direction of the mail item M reaches the sensor S5, the
downstream-side separable roller pair 40 is not opened. That is to
say, also here, the downstream-side separable roller pair 40
functions in a similar manner as the other conveying roller
pairs.
[0098] On the other hand, if two comparatively short mail items are
conveyed consecutively as shown in FIG. 13, after the trailing edge
in conveying direction of the preceding mail item M has passed the
sensor S2, as shown in FIG. 13A, the measurement of the weight of
this preceding mail item M begins. The weight measurement of the
preceding mail item M continues until the leading edge in conveying
direction of the preceding mail item M reaches the sensor S5 (state
shown in FIG. 13D) or until the leading edge in conveying direction
of the following mail item M reaches the sensor S3 (state shown in
FIG. 13C).
[0099] Moreover, the measurement of the weight of the following
mail item M is carried out in the time after the trailing edge in
conveying direction of the preceding mail item M has passed the
sensor S4 (state shown in FIG. 13E) and before the leading edge in
conveying direction of the mail item M (the following mail item M)
has reached the sensor S5 (state shown in FIG. 13F). That is to
say, also in this case, it is detected by the sensor S0 in advance
that the lengths in conveying direction of the two mail items M
that are conveyed consecutively are comparatively short, so that
the upstream-side separable roller pair 4 and the downstream-side
separable roller pair 40 are not opened.
[0100] That is to say, if relatively short mail items M are
conveyed and processed as in this first operation example, then the
upstream-side separable roller pair 4 and the downstream-side
separable roller pair 40 are not opened, and function similarly to
the other conveying roller pairs.
[0101] As a second operation example, the following is an
explanation with reference to FIGS. 14 and 15 of the case that a
mail item M whose length in conveying direction is relatively long
is conveyed and processed. When, after the leading edge in
conveying direction of the mail item M conveyed in the arrow
direction T on the conveying path 2 has passed the sensor S3 and
the mail item M has been fed into the weight measuring apparatus
10, as shown in FIG. 14A, the trailing edge in conveying direction
of the mail item M passes the sensor S1 as shown in FIG. 14B, the
measurement of the weight of the mail item M with the weight
measuring apparatus 10 becomes possible. At this time, the length
of the mail item M measured in advance by the sensor S0 is
relatively long, so that the upstream-side separable roller pair 4
is opened in advance before the weight measurement of the mail item
M is started.
[0102] After this, the mail item M is conveyed further and passes
through the weight measuring apparatus 10, and the weight of the
mail item M is measured until the leading edge in conveying
direction of the mail item M is detected by the sensor S6 (state
shown in FIG. 14D). In this situation, the fact that the length in
conveying direction of the mail item M is relatively long has
already been detected by the sensor S0, so that the downstream-side
separable roller pair 40 is opened in advance, before the front
edge in conveying direction of the mail item M passes the sensor
S5.
[0103] That is to say, the upstream-side separable roller pair 4
and the downstream-side separable roller pair 40 are opened at a
suitable timing, such that no undesired force is applied by the
upstream-side separable roller pair 4 or the downstream-side
separable roller pair 40 to the mail item M while the weight of the
mail item M is being measured. Moreover, after the trailing edge in
conveying direction of the mail item M has passed the upstream-side
separable roller pair 4, the upstream-side separable roller pair 4
is closed for the following mail item M (state shown in FIG. 14D).
Furthermore, after the trailing end in conveying direction of the
mail item M has passed the downstream-side separable roller pair
40, the downstream-side separable roller pair 40 is closed (state
shown in FIG. 14F).
[0104] On the other hand, if two relatively long mail items M are
conveyed consecutively, as shown in FIG. 15, then, after the rear
end in conveying direction of the preceding mail item M has passed
the sensor S1 as shown in FIG. 15A, the measurement of the length
of the preceding mail item M starts. The measurement of the length
of the preceding mail item M continues until the leading edge in
conveying direction of the preceding mail item M reaches the sensor
S6 (the state shown in FIG. 15D), or until the leading edge in
conveying direction of the following mail item M reaches the sensor
S3.
[0105] Moreover, the measurement of the weight of the following
mail item M is started after the trailing edge in conveying
direction of the preceding mail item has passed the sensor S4, and
after the trailing edge in conveying direction of the mail item M
(the following mail item M) has passed the sensor S1 (state shown
in FIG. 15E). Then, after this, the measurement of the length of
the following mail item M is finished in the time until the leading
edge in conveying direction of the mail item M has reached the
sensor S6 (state shown in FIG. 15G).
[0106] In this case, the controller 30 has detected in advance that
the lengths in conveying direction of the two mail items M that are
conveyed consecutively are relatively long, so that the
upstream-side separable roller pair 4 and the downstream-side
separable roller pair 40 are not closed.
[0107] Next, as a third operation example, the case is explained
with reference to FIG. 16 that a mail item M whose length in
conveying direction is relatively short is conveyed consecutively
to a mail item M whose length in conveying direction is relatively
long. As shown in FIG. 16A, when a relatively long preceding mail
item M is fed into the weight measuring apparatus 10 and its rear
end passes the sensor S1, then the weight measurement of the mail
item M becomes possible. In this situation, the fact that the
length of the mail item M in conveying direction is relatively long
has already been detected by the sensor S0, so that at the time
when the weight measurement of the mail item M starts (state shown
in FIG. 16A), the upstream-side separable roller pair 4 and the
downstream-side separable roller pair 40 are opened.
[0108] The weight measurement of the mail item M is carried out in
the time until the leading edge in conveying direction of the mail
item M (the relatively long preceding mail item M) has reached the
sensor S6 (state shown in FIG. 16D), or until the following mail
item M has been fed into the nip of the holding roller pair 3 on
the upstream side of the weight measuring apparatus 10.
[0109] Moreover, in this third operation example, it is detected in
advance with the sensor S0 that the length of the following mail
item M in conveying direction is relatively short, so that after
the trailing edge in conveying direction of the preceding mail item
M has passed the sensor S2, the upstream-side separable roller pair
4 is closed as shown in FIG. 16C, in order to securely hand over
and convey the following mail item M to the weight measuring
apparatus 10.
[0110] Then, the weight measurement of the relatively short
following mail item M is started when the leading edge in conveying
direction of the mail item M (the following mail item M) has been
fed into the weight measuring apparatus 10, and after the trailing
edge in conveying direction of the preceding mail item M has passed
the sensor S4 (state shown in FIG. 16G). Moreover, the weight
measurement of the following mail item M is finished until the
leading edge in conveying direction of the mail item M (the
following mail item M) reaches the sensor S5 (state shown in FIG.
16H).
[0111] Needless to say, at the time when the weight measurement of
the following mail item M starts, the weight measurement of the
preceding mail item M has finished, so that the downstream-side
separable roller pair 40 is closed. In other words, at the time
when the following mail item M is held by the upstream-side holding
roller pair 3 of the weight measuring apparatus 10 (state shown in
FIG. 16F), the weight measurement of the preceding mail item M
becomes impossible, so that at this time, the downstream-side
separable roller pair 40 is closed.
[0112] That is to say, since it has already been detected with the
sensor S0 that the following mail item M is a comparatively short
mail item, the downstream-side separable roller pair 40 is closed
after the trailing edge in conveying direction of the preceding
mail item M has passed the sensor S5 (state shown in FIG. 16H), the
trailing edge in conveying direction of the preceding mail item has
passed the sensor S4 (state shown in FIG. 16G), or after the
following mail item M has been fed into the weight measuring
apparatus 10 (state shown in FIG. 16F).
[0113] As a fourth operation example, the case is explained with
reference to FIG. 17 that a mail item M whose length in conveying
direction is relatively long is conveyed consecutively to a mail
item M whose length in conveying direction is relatively short. As
shown in FIG. 17A, when a relatively short preceding mail item M is
fed into the weight measuring apparatus 10 and its rear end passes
the sensor S2, then the weight measurement of this mail item M
becomes possible.
[0114] In this situation, the fact that the length of the mail item
M in conveying direction is relatively short has already been
detected by the sensor S0, so that at the time when the weight
measurement of the mail item M starts (state shown in FIG. 17A),
the upstream-side separable roller pair 4 and the downstream-side
separable roller pair 40 are closed.
[0115] The weight measurement of the mail item M is carried out in
the time until the leading edge in conveying direction of the mail
item M (the relatively short preceding mail item M) has reached the
sensor S5 (state shown in FIG. 17D), or until the following mail
item M has been fed into the nip of the holding roller pair 3 on
the upstream side of the weight measuring apparatus 10 (state shown
in FIG. 17C).
[0116] Moreover, in this fourth operation example, it is detected
in advance with the sensor S0 that the length of the following mail
item M in conveying direction is relatively long, so that after the
trailing edge in conveying direction of the preceding mail item M
has passed the sensor S2, the upstream-side separable roller pair 4
is opened as shown in FIG. 17B.
[0117] Then, the weight measurement of the relatively long
following mail item M is started when the leading edge in conveying
direction of the mail item M (the following mail item M) has been
fed into the weight measuring apparatus 10, after the trailing edge
in conveying direction of the preceding mail item M has passed the
sensor S4, and after the trailing edge in conveying direction of
the following mail item M has passed the sensor S1 (state shown in
FIG. 17D). Moreover, the weight measurement of the following mail
item M is finished until the leading edge in conveying direction of
the mail item M (the following mail item M) reaches the sensor S6
(state shown in FIG. 17G).
[0118] Since it has been detected in advance with the sensor S0
that the length of the following mail item M in conveying direction
is relatively long, the downstream-side separable roller pair 40 is
opened after the relatively short preceding mail item M has been
handed over to the nip of the downstream-side conveying roller pair
6, in order to gain time for measuring the weight of the following
mail item M.
[0119] With the present embodiment as described above, similar
effects can be achieved as with the above-described first and
second embodiments.
[0120] Referring to FIGS. 18 and 19, the following is a discussion
of the relation between the distance between the plurality of
rollers lined up along the conveying path 2 and the above-described
length in conveying direction of the shortest mail item Mmin and
the longest mail item Mmax.
[0121] It should be noted that here, in order to keep the
explanations simple, a simplified apparatus configuration is shown,
in which the weight measuring apparatus 10 is assumed to have only
one holding roller pair (holding roller pair 3). That is to say,
FIG. 18 shows a simplified apparatus configuration of the handling
apparatus 100 of the above-described first embodiment, and FIG. 19
shows a simplified apparatus configuration of the handling
apparatus 110 of the above-described second embodiment.
[0122] In the handling apparatuses 100 and 110, a configuration is
adopted, in which, instead of the upstream-side conveying roller
pair 8, two belts are wound around the conveying roller 8R, and
instead of the downstream-side conveying roller pair 6, two belts
are wound around the conveying roller 6R. In this case, the
location where the two belts are wound around the conveying roller
8R (6R) functions as a conveying nip that can impart a conveying
force on the mail items M.
[0123] As explained for the above-described embodiments, the
distance L between the nips of neighboring roller pairs along the
conveying path 2, that is to say, the upstream-side conveying
roller pair 8, the upstream-side separable roller pair 4, the
holding roller pair 3 of the weight measuring apparatus 10, the
downstream-side separable roller pair 40, and the downstream-side
conveying roller pair 6 is set shorter than the length in conveying
direction of the shortest mail item Mmin. Thus, it is possible to
securely hand over and convey mail items M of all different lengths
between the roller pairs.
[0124] That is to say, in the handling apparatus 100 of FIG. 18,
the distance between the nip of the conveying roller 8R on the
upstream side and the nip of the upstream-side separable roller
pair 4, the distance between the nip of the upstream-side separable
roller pair 4 and the nip of the holding roller pair 3, and the
distance between the nip of the holding roller pair 3 and the nip
of the conveying roller 6R on the downstream side are each set to
be shorter than the length of the shortest mail item Mmin in
conveying direction. In other words the length in conveying
direction from the nip of the upstream-side separable roller pair 4
to the nip of the conveying roller 6R on the downstream side is
shorter than twice the length of the shortest mail item Mmin in
conveying direction.
[0125] Moreover, also in the handling apparatus 110 in FIG. 19, the
distance between the nip of the conveying roller 8R on the upstream
side and the nip of the holding roller pair 3, the distance between
the nip of the holding roller pair 3 and the nip of the
downstream-side separable roller pair 40, and the distance between
the nip of the downstream-side separable roller pair 40 and the nip
of the conveying roller 6R on the downstream side are each set to
be shorter than the length of the shortest mail item Mmin in
conveying direction. In other words the length in conveying
direction from the nip of the conveying roller 8R on the upstream
side to the nip of the downstream-side separable roller pair 40 is
shorter than twice the length of the shortest mail item Mmin in
conveying direction.
[0126] On the other hand, in order to measure the weight of a
longest mail item Mmax, it is necessary to make the distance
between the nip of the conveying roller 8R on the upstream side and
the nip of the conveying roller 6R on the downstream side longer
than the length of the longest mail item Mmax in conveying
direction.
[0127] That is to say, in the handling apparatus 100 shown in FIG.
18, in the time after the leading edge in conveying direction of
the longest mail item Mmax that is conveyed on the conveying path 2
is held by the holding roller pair 3 and the trailing edge in
conveying direction of the mail item Mmax has passed the nip of the
conveying roller 8R on the upstream side, and until the leading
edge in conveying direction of the mail item M passes the nip of
the conveying roller 6R on the downstream side, it becomes possible
to measure the weight of that longest mail item Mmax in a state in
which the upstream-side separable roller pair 4 is open, but if the
distance between the nip of the conveying roller 8R on the upstream
side and the nip of the conveying roller 6R on the downstream side
is not at least longer than the length of the longest mail item
Mmax in conveying direction, then it is not possible to ensure the
time for measuring the weight of this longest mail item Mmax.
[0128] Similarly, in the handling apparatus 110 shown in FIG. 19,
in the time after the leading edge in conveying direction of the
longest mail item Mmax that is conveyed on the conveying path 2 is
held by the holding roller pair 3 and the trailing edge in
conveying direction of the mail item Mmax has passed the nip of the
conveying roller 8R on the upstream side, and until the leading
edge in conveying direction of the mail item Mmax passes the nip of
the conveying roller 6R on the downstream side, it becomes possible
to measure the weight of that longest mail item Mmax in a state in
which the downstream-side separable roller pair 40 is open, but if
the distance between the nip of the conveying roller 8R on the
upstream side and the nip of the conveying roller 6R on the
downstream side is not at least longer than the length of the
longest mail item Mmax in conveying direction, then it is not
possible to ensure the time for measuring the weight of this
longest mail item Mmax.
[0129] Referring to FIG. 20, the following is an explanation of a
mail handling apparatus 130 according to a fourth embodiment
(referred to below simply as "handling apparatus 130"). Other than
having a gap correction apparatus 50 (processing portion) instead
of the weight measuring apparatus 10, the handling apparatus 130 of
this embodiment has a structure that is substantially the same as
the handling apparatus 100 of the first embodiment described above.
Thus, structural elements having the same function as those in the
above-described first embodiment are assigned the same reference
numerals and their further explanation has been omitted.
[0130] That is to say, in the handling apparatus 130 of the present
embodiment, the mail item M that is conveyed on the conveying path
2 is passed along the upstream-side separable roller pair 4, the
holding roller pair 51 of the gap correction apparatus 50, and the
downstream-side conveying roller pair 6 in that order. The gap
correction apparatus 50 is provided mechanically independent from
the upstream-side and the downstream-side conveying system of the
handling apparatus 130. Therefore, the gaps before and after the
mail item M passing through the gap correction apparatus 50 can be
corrected with high precision.
[0131] The gap correction apparatus 50 includes a holding roller
pair 51 that conveys the mail item M while clamping it, by taking
in with a nip the mail item M conveyed on the conveying path 2 and
rotating it. The holding roller pair 51 includes a holding roller
51F and a holding roller 51R. The holding roller 51F is arranged on
the front side of the apparatus and the holding roller 51R is
arranged on the rear side of the apparatus, with the conveying path
2 arranged between them. The holding roller pair 51 of the gap
correction apparatus 50 has substantially the same structure as the
holding roller pair 3 of the weight measuring apparatus 10. Thus, a
detailed explanation of the holding roller pair 51 is omitted.
[0132] A motor 54 is connected via a coupling 52 to the rotation
shaft 51a of the holding roller 51F on the front side, and this
front-side holding roller 51F functions as a driving roller.
Furthermore, a control board 56 is connected to this motor 54,
enabling rotation speed control of the motor 54.
[0133] Moreover, also in the handling apparatus 130 of the present
embodiment, the distance between the nips of the plurality of
roller pairs lined up along the conveying path 2 is set to a
constant length. That is to say, the distance between the nip of
the upstream-side separable roller pair 4 and the nip of the
holding roller pair 51 of the gap correction apparatus 50 as well
as the distance between the nip of the holding roller pair 51 of
the gap correction apparatus 50 and the nip of the downstream-side
conveying roller pair 6 is set to a distance that is shorter (120
mm in the present embodiment) than the length of the shortest mail
item Mmin in conveying direction. That is to say, the length in
conveying direction from the nip of the upstream-side separable
roller pair 4 to the nip of the downstream-side conveying roller
pair 6 is set to be shorter than twice the length of the shortest
mail item (sheet) Mmin in conveying direction.
[0134] Referring to FIG. 21, the following is an explanation of the
operation of the handling apparatus 130 with the above-described
structure. In the standby state before a mail item M is fed into
the handling apparatus 130, the controller 30 closes the
upstream-side separable roller pair 4 (state shown in FIG. 21A).
Then, every time mail items M are conveyed on the conveying path 2,
the controller 30 detects the length of each mail item M in
conveying direction and the spacing (gap) between the mail items M,
with the sensor S0 that is arranged upstream in conveying direction
from the upstream-side conveying roller pair 8.
[0135] To detect the length of a mail item M, the controller 30
calculates the length of the mail item M based on the conveying
speed of the mail item M and the time after the leading edge in
conveying direction of the mail item M has passed the sensor S0 and
the output from the sensor S0 has gone from light to dark, until
the trailing edge in conveying direction of the mail item M has
passed the sensor S0 and the output from the sensor S0 has gone
from dark to light. Moreover, to detect a gap between mail items M,
the controller 30 calculates the gap between mail items M based on
the conveying speed of the mail items M and the time after the
trailing edge in conveying direction of a preceding mail item M has
passed the optical axis of the sensor S0 until the leading edge in
conveying direction of the following mail item M passes the sensor
S0.
[0136] Then, when the leading edge in conveying direction of the
conveyed mail item M reaches the nip of the holding roller pair 51
of the gap correction apparatus 50 and the optical axis of the
sensor S3 is blocked (state shown in FIG. 21A), the controller 30
opens the upstream-side separable roller pair 4 to undertake a gap
correction of the mail items M (state shown in FIG. 21B).
Furthermore, at this time, the controller 30 monitors the output of
the sensor S1, and taking the fact that the trailing edge in
conveying direction of the mail item M has passed the nip of the
upstream-side conveying roller pair 8 (state shown in FIG. 21B) as
a trigger, the controller 30 starts the rotation control of the
motor 54 of the holding roller 51F of the gap correction apparatus
50, so as to change the conveying speed of the mail item M.
[0137] The gap between the mail items M can be controlled by
decelerating or accelerating the conveying speed of the mail items
M. In the present embodiment, since the length of all conveyed mail
items M in conveying direction as well as the length of the gaps
has been detected in advance with the sensor S0, the gaps between
the mail items M can be controlled to the desired value by
accelerating or decelerating the motor 54 based on the length of
the mail items M in conveying direction and the gap length.
[0138] After this, the controller 30 monitors the output of the
sensor S4 and closes the upstream-side separable roller pair 4,
taking the fact that the leading edge in conveying direction of the
mail item M has reached the nip of the downstream-side conveying
roller pair 6 (state shown in FIG. 21D) or the fact that the gap
correction control of the mail items M has finished as a
trigger.
[0139] With the handling apparatus 130 of the present embodiment as
described above, similar effects can be achieved as with the
handling apparatus 100 of the above-described first embodiment.
That is to say, the upstream-side separable roller pair 4 is opened
at the point in time when the trailing edge in conveying direction
of the mail item M fed into the gap correction apparatus 50 has
passed the nip of the upstream-side conveying roller pair 8, so
that the gap correction of the mail items M can be started before
the trailing edge in conveying direction of the mail item M passes
the nip of the upstream-side separable roller pair 4, the gap
correction can be started at an earlier timing, and a more precise
gap correction becomes possible.
[0140] Moreover, with the present embodiment, since it is
sufficient to make the simple configurational change of enabling
opening and closing of the roller pair (the upstream-side separable
roller pair 4 in the present embodiment) that is next to the gap
correction apparatus 50 on the upstream side in conveying
direction, a large-scale redesign of the apparatus is unnecessary,
so that also the manufacturing costs of the apparatus can be kept
low.
[0141] Moreover, with the present embodiment, if the gap correction
of the mail items M is finished before sensing that the leading
edge in conveying direction of the mail item M has reached the nip
of the downstream-side conveying roller pair 6, then the
upstream-side separable roller pair 4 is closed at that point in
time, so that the mail items M can be more reliably conveyed in a
stable manner.
[0142] Furthermore, with the present embodiment, if the trailing
edge in conveying direction of the mail item M passes the
upstream-side separable roller pair 4 after the upstream-side
separable roller pair 4 is closed, then it becomes immediately
possible to hand over the next mail item M to the upstream-side
separable roller pair 4, so that there is no necessity to widen the
gap between the mail items M, and there is no necessity to branch
the conveying path into two directions and to provide two gap
correction apparatuses 50 in parallel, so that the installation
space of the apparatus does not become large.
[0143] FIG. 22 is a diagrammatic view, taken from the front, of a
mail handling apparatus 140 (referred to below simply as "handling
apparatus 140") according to the fifth embodiment. Other than being
provided with an upstream-side conveying roller pair 8 at the
position of the upstream-side separable roller pair 4 of the
above-described handling apparatus 130 of the fourth embodiment and
being newly provided with a downstream-side separable roller pair
40 at the position of the downstream-side conveying roller pair 6
of the above-described handling apparatus 130 of the fourth
embodiment, the handling apparatus 140 of this embodiment has a
structure that is substantially the same as that of the handling
apparatus 130 of the fourth embodiment described above. Thus,
structural elements having the same function as those in the
handling apparatus 130 of the above-described fourth embodiment are
assigned the same reference numerals and their further explanation
has been omitted.
[0144] That is to say, a mail item M that is conveyed in the arrow
direction T in the drawing on the conveying path 2 of the handling
apparatus 140 is passed along the upstream-side conveying roller
pair 8, the holding roller pair 51 of the gap correction apparatus
50, and the downstream-side separable roller pair 40 in that
order.
[0145] It should be noted that the downstream-side separable roller
pair 40 has substantially the same structure as the above-described
upstream-side separable roller pair 4, and is opened and closed by
a similar separating mechanism 20 (downstream-side separating
mechanism) as in the above-described fourth embodiment. Moreover,
also in the present embodiment, the distance between the nips of
the roller pairs 8, 51 and 40 that are lined up along the conveying
path 2 is set to 120 mm. That is to say, the length in conveying
direction from the nip of the upstream-side conveying roller pair 8
to the nip of the downstream-side separable roller pair 40 is set
to be shorter than twice the length in conveying direction of the
shortest mail item Mmin.
[0146] Referring to FIG. 23, the following is an explanation of the
operation of the handling apparatus 140 with the above-described
structure. In the standby state before a mail item M is fed into
the handling apparatus 140, the controller 30 closes the
downstream-side separable roller pair 40 (state shown in FIG. 23A).
Then, every time mail items M are conveyed on the conveying path 2,
the controller 30 detects the length of each mail item M in
conveying direction and the spacing (gap) between the mail items M,
for example with the sensor S0 that is arranged upstream in
conveying direction from the upstream-side conveying roller pair
8.
[0147] To detect the length of a mail item M, the controller 30
calculates the length of the mail item M in conveying direction
based on the conveying speed of the mail item M and the time after
the leading edge in conveying direction of the mail item M has
passed the sensor S0 and the output from the sensor S0 has gone
from light to dark, until the trailing edge in conveying direction
of the mail item M has passed the sensor S0 and the output from the
sensor S0 has gone from dark to light. Moreover, to detect a gap
between mail items M, the controller 30 calculates the gap between
mail items M based on the conveying speed of the mail items M and
the time after the trailing edge in conveying direction of a
preceding mail item M has passed the optical axis of the sensor S0
until the leading edge in conveying direction of the following mail
item M passes the sensor S0.
[0148] Then, when the leading edge in conveying direction of the
conveyed mail item M passes the nip of the holding roller pair 51
of the gap correction apparatus 50 and reaches the nip of the
downstream-side separable roller pair 40, and the optical axis of
the sensor S3 is blocked, the controller 30 opens the
downstream-side separable roller pair 40 to undertake a gap
correction of the mail items M (state shown in FIG. 23B).
Furthermore, at this time, the controller 30 monitors the output of
the sensor S1, and taking the fact that the trailing edge in
conveying direction of the mail item M has passed the nip of the
upstream-side conveying roller pair 8 (state shown in FIG. 23B) as
a trigger, the controller 30 starts the rotation control of the
motor 54 of the holding roller 51F of the gap correction apparatus
50, so as to change the conveying speed of the mail item M.
[0149] The gap between the mail items M can be controlled by
decelerating or accelerating the conveying speed of the mail items
M. In the present embodiment, since the length of all conveyed mail
items M in conveying direction as well as the length of the gaps
has been detected in advance with the sensor S0, the gaps between
the mail items M can be controlled to the desired value by
accelerating or decelerating the motor 54 based on the length of
the mail items M in conveying direction and the gap length.
[0150] After this, the controller 30 monitors the output of the
sensor S4 and closes the downstream-side separable roller pair 40,
taking the fact that the leading edge in conveying direction of the
mail item M has reached the nip of the downstream-side conveying
roller pair 6 (state shown in FIG. 23D) or the fact that the gap
correction control of the mail items M has finished as a trigger
(state shown in FIG. 23D).
[0151] With the handling apparatus 140 of the present embodiment as
described above, similar effects can be achieved as with the
handling apparatus 110 of the above-described second embodiment.
That is to say, the downstream-side separable roller pair 40 is
opened at the point in time when the leading edge in conveying
direction of the mail item M fed into the gap correction apparatus
50 has reached the nip of the downstream-side separable roller pair
40, so that when the gap correction of the mail item M is started,
the conveying state of the mail item M can be stabilized, and a
more precise gap correction becomes possible.
[0152] Moreover, with the present embodiment, since it is
sufficient to make the simple configurational change of enabling
opening and closing of the roller pair (the downstream-side
separable roller pair 40 in the present embodiment) that is next to
the gap correction apparatus 50 on the downstream side in conveying
direction, a large-scale redesign of the apparatus is unnecessary,
so that also the manufacturing costs of the apparatus can be kept
low.
[0153] Moreover, with the present embodiment, if the gap correction
of a mail item M is finished before sensing that the leading edge
in conveying direction of the mail item M has reached the nip of
the downstream-side conveying roller pair 6, then the
downstream-side separable roller pair 40 is closed at that point in
time, so that the mail items M can be more reliably conveyed in a
stable manner.
[0154] Furthermore, with the present embodiment, if the trailing
edge in conveying direction of the mail item M passes the holding
roller pair 51 of the gap correction apparatus 50 after the
downstream-side separable roller pair 40 is closed, then it becomes
immediately possible to hand over the next mail item M to the
holding roller pair 51, so that there is no necessity to widen the
gap between the mail items M, and there is no necessity to branch
the conveying path into two directions and to provide two gap
correction apparatuses 50 in parallel, so that the installation
space of the apparatus does not become large.
[0155] FIG. 24 is a diagrammatic view, taken from the front, of a
mail handling apparatus 150 (referred to below simply as "handling
apparatus 150") according to the sixth embodiment. This handling
apparatus 150 has a structure combining the handling apparatus 130
of the fourth embodiment and the handling apparatus 140 of the
fifth embodiment described above. That is to say, a mail item M
that is conveyed on the conveying path 2 is passed along the
upstream-side separable roller pair 4, the holding roller pair 51
of the gap correction apparatus 50, and the downstream-side
separable roller pair 40 in that order.
[0156] The upstream-side separable roller pair 4 can be opened and
closed by a separating mechanism 20 (here, referred to as
"upstream-side separating mechanism 20U"), whereas the
downstream-side separable roller pair 40 can be opened and closed
by a separating mechanism 20 (here, referred to as "downstream-side
separating mechanism 20D"). It should be noted that the length in
conveying direction from the nip of the upstream-side separable
roller pair 4 to the nip of the downstream-side conveying roller
pair 6 is set to be shorter than three times the length of the
shortest mail item Mmin in conveying direction. Here, the same
reference numerals are assigned to structural elements having the
same function as those in the handling apparatus 130 of the fourth
embodiment or the handling apparatus 140 of the fifth embodiment
described above, and their further explanation has been
omitted.
[0157] Referring to FIGS. 25 and 26, the following is an
explanation of several operation examples of the handling apparatus
150 of the present embodiment. First of all, as a first operation
example, the case that a mail item M whose length in conveying
direction is relatively short is conveyed and processed is
explained with reference to FIG. 25. If the length of the mail item
M conveyed on the conveying path 2 is detected with the sensor S0
and it is judged that that mail item M is a comparatively short
mail item, then the controller 30 closes both the upstream-side
separable roller pair 4 and the downstream-side separable roller
pair 40 (state shown in FIG. 25A). When in this state, the leading
edge in conveying direction of the mail item M conveyed in arrow
direction T on the conveying path 2 passes the sensor S3 and the
mail item M is fed into the gap correction apparatus 50 as shown in
FIG. 25B, then the controller 30 opens the upstream-side separable
roller pair 4 to undertake a gap correction operation for the mail
item M.
[0158] After this, taking the fact that the trailing edge in
conveying direction of the mail item M has passed the sensor S1 as
a trigger (state shown in FIG. 25B), the controller 30 starts the
gap correction operation for the mail item M. The gap correction
operation for the mail item M continues until the leading edge in
conveying direction of the mail item M is detected with the sensor
S5 (state shown in FIG. 25F) or until the trailing edge in
conveying direction of the mail item M has passed the sensor S3
(state shown in FIG. 25F).
[0159] In this situation, when the leading edge in conveying
direction of the mail item M has reached the sensor S4, the
controller 30 opens the downstream-side separable roller pair 40.
Moreover, at the point in time when the gap correction operation
for the mail item M has finished, the controller 30 closes the
upstream-side separable roller pair 4 after the trailing edge in
conveying direction of the mail item M has passed the sensor S2.
Furthermore, at the point in time when the gap correction operation
for the mail item M has finished, the controller 30 closes the
downstream-side separable roller pair 40 after the trailing edge in
conveying direction of the mail item M has passed the sensor
S3.
[0160] Next, as a second operation example, the following is an
explanation with reference to FIG. 26 of the case that a mail item
M whose length in conveying direction is relatively long is
conveyed and processed. If the conveyed mail item M is detected by
the sensor S0 to be a relatively long mail item, then, as shown in
FIG. 26A, the upstream-side separable roller 4 and the
downstream-side separable roller pair 40 may be closed or they may
be open. When the leading edge in conveying direction of the mail
item M conveyed on the conveying path 2 passes the sensor S3 and is
fed into the gap correction apparatus 50, then the controller 30
opens the upstream-side separable roller pair 4 and the
downstream-side separable roller pair 40, to undertake a gap
correction operation for the mail item M.
[0161] After this, the controller 30 monitors the output of the
sensor S1, and judges whether the trailing edge in conveying
direction of the mail item M has passed the nip of the
upstream-side conveying roller pair 8. Then, when the output of the
sensor S1 has gone from dark to light and it is judged that the
trailing edge in conveying direction of the mail item M has passed
the nip of the upstream-side conveying roller pair 8 (state shown
in FIG. 26B), the controller 30 starts the gap correction operation
for the mail item M.
[0162] The gap correction operation for the mail item M is
continued until the leading edge in conveying direction of the mail
item M has passed the sensor S5 and reaches the nip of the
downstream-side conveying roller pair 6. Then, at the point in time
when the leading edge in conveying direction of the mail item M has
been detected by the sensor S5 and fed into the nip of the
downstream-side conveying roller pair 6 (state shown in FIG. 26D),
the controller 30 closes the upstream-side separable roller pair 4
and the downstream-side separable roller pair 40.
[0163] With the present embodiment as described above, similar
effects can be achieved as with the above-described third
embodiment.
[0164] While certain embodiments have been described, those
embodiments have been presented by way of example only, and are not
intended to limit the scope of the inventions. Indeed, the novel
apparatuses described herein may be embodied in a variety of other
forms; furthermore, various omissions, substitutions and changes in
the form of the apparatuses described herein may be made without
departing from the spirit of the inventions. The accompanying
claims and their equivalents are intended to cover such forms or
modifications as would fall within the scope and spirit of the
inventions.
* * * * *