U.S. patent application number 10/683127 was filed with the patent office on 2004-07-22 for tube pump, tube for tube pump and liquid ejecting apparatus.
This patent application is currently assigned to SEIKO EPSON CORPORATION. Invention is credited to Harada, Shuhei, Ito, Hiroyuki, Takahashi, Nobuhito.
Application Number | 20040141863 10/683127 |
Document ID | / |
Family ID | 32718733 |
Filed Date | 2004-07-22 |
United States Patent
Application |
20040141863 |
Kind Code |
A1 |
Harada, Shuhei ; et
al. |
July 22, 2004 |
Tube pump, tube for tube pump and liquid ejecting apparatus
Abstract
A tube pump, includes a tube, a tube pump body including a
roller, and rotating the roller for depressing to flatten the tube,
and a pump holder, having substantially a cylindrical shape, and
containing the tube pump body and the tube therein. The tube has a
curve portion, an upstream side portion extended upstream from the
curve portion, and a downstream side portion extended downstream
from the curve portion. The tube is drawn out so as to overlap the
upstream side portion and the downstream side portion being
parallel each other. Also, a second tube pump includes a tube, a
casing containing a flow path middle portion of the tube, and a
pressing member pressing the flow path middle portion against an
inner wall of the casing. The pressing member includes a contact
member facing to the casing through the tube and an urging member
urging the contact member to the tube by an elastic force. Also, a
tube for a tube pump includes a plurality of tube bodies, each
including a flow path, and a tube connecting portion connecting the
tube bodies separately from each other so as to escape wall
thicknesses of the tube bodies in a state that the tube is
depressed to flatten.
Inventors: |
Harada, Shuhei; (Nagano,
JP) ; Takahashi, Nobuhito; (Nagano, JP) ; Ito,
Hiroyuki; (Nagano, JP) |
Correspondence
Address: |
SUGHRUE MION, PLLC
2100 PENNSYLVANIA AVENUE, N.W.
SUITE 800
WASHINGTON
DC
20037
US
|
Assignee: |
SEIKO EPSON CORPORATION
|
Family ID: |
32718733 |
Appl. No.: |
10/683127 |
Filed: |
October 14, 2003 |
Current U.S.
Class: |
417/476 ;
417/474 |
Current CPC
Class: |
F04B 43/0072 20130101;
F04B 43/1253 20130101 |
Class at
Publication: |
417/476 ;
417/474 |
International
Class: |
F04B 043/12 |
Foreign Application Data
Date |
Code |
Application Number |
Oct 11, 2002 |
JP |
P.2002-299470 |
Oct 16, 2002 |
JP |
P.2002-302255 |
Oct 17, 2002 |
JP |
P.2002-303483 |
Claims
What is claimed is:
1. A tube for a tube pump, comprising: a plurality of tube bodies,
each including a flow path; and a tube connecting portion,
connecting the tube bodies separately from each other so as to
escape wall thicknesses of the tube bodies in a state that the tube
is depressed to flatten.
2. The tube as set forth in claim 1, wherein the tube is depressed
to flatten by a load given by multiplying a load for depressing a
single tube body of the tube bodies to flatten by substantially a
number of the tube bodies of the tube.
3. The tube as set forth in claim 1, wherein the tube includes at
least two tube bodies connected by the tube connecting portion; and
wherein a diameter of each of the tube bodies is 4.6 mm, a wall
thickness thereof is 1 mm, and a distance between centers of
adjacent tube bodies of the at least two tube bodies is 5.1 mm.
4. The tube as set forth in claim 1, wherein the tube connecting
portion separates the tube bodies from each other in a state that
the tube is not depressed to flatten; and wherein the tube makes
the tube bodies proximate to each other in a state that the tube is
depressed to flatten.
5. The tube as set forth in claim 4, wherein the tube connecting
portion is buckled so as to make the tube bodies proximate to each
other when the tube is depressed to flatten.
6. The tube as set forth in claim 1, wherein the tube connecting
portion connects the tube bodies substantially at a center of the
tube bodies in a direction of depressing the tube bodies to
flatten.
7. A tube pump, comprising: a tube, drawn out in a shape of a ring;
a tube pump body, including a roller, and rotating the roller for
depressing to flatten the tube from an inner side of the ring; a
pump holder, having substantially a cylindrical shape, and
containing the tube pump body and the tube therein; and a tube
holder, detachably mounted on the pump holder, and holding the tube
in the shape of the ring as a ring portion by overlapping an
upstream side portion extended upstream from the ring portion of
the tube and a downstream side portion extended downstream from the
ring portion of the tube.
8. The tube pump as set forth in claim 7, wherein the tube holder
is detachably mounted on the pump holder in a direction
intersecting with the ring portion of the tube.
9. The tube pump as set forth in claim 7, wherein the tube includes
a plurality of tube bodies; and wherein the tube holder includes a
positioning projection projected along a longitudinal direction of
the tube bodies for positioning the tube bodies.
10. The tube pump as set forth in claim 7, wherein the tube holder
holds the tube in a state of bending the tube.
11. The tube pump as set forth in claim 7, wherein the tube holder
includes a tube holder body and a tube holder lid; wherein the tube
holder body and the tube holder lid holds the tube at a clearance
therebetween; and wherein the clearance is smaller than an outer
diameter of the tube in a sate that the tube holder is attached to
the pump holder.
12. A tube pump, comprising: a tube; a tube pump body, including a
roller, and rotating the roller for depressing to flatten the tube;
and a pump holder, having substantially a cylindrical shape, and
containing the tube pump body and the tube therein, wherein the
tube has a curve portion, an upstream side portion extended
upstream from the curve portion, and a downstream side portion
extended downstream from the curve portion; and wherein the tube is
drawn out from the tube pump body so as to overlap the upstream
side portion and the downstream side portion being parallel each
other.
13. A tube pump, comprising a tube; a casing, containing a flow
path middle portion of the tube; and a pressing member, pressing
the flow path middle portion against an inner wall of the casing,
wherein the pressing member includes: a contact member, facing to
the casing through the tube; and an urging member, urging the
contact member to the tube by an elastic force.
14. The tube pump as set forth in claim 13, wherein the inner wall
of the casing is formed in a cylindrical shape; wherein the urging
member includes: a rotating member, rotated with a center of the
inner wall as an axis center; a supporting member, supported on the
rotating member so that a distance of the contact member from the
axis center can be changed, and supporting the contact member; and
an elastic member, disposed between the rotating member and the
supporting member, and urging the supporting member by the elastic
force such that the contact member is separated from the axis
center.
15. The tube pump as set forth in claim 13, wherein the flow path
middle portion is contained along the inner wall of the casing so
as to draw in a Q shape; and wherein the tube has a bundled portion
in which an upstream side end portion and a downstream side end
portion of the flow path middle portion are overlapped in a state
that directions of liquid flow in the upstream side end portion and
the downstream side end portion are reverse to each other.
16. The tube pump as set forth in claim 15, wherein the supporting
member is supported on the rotating member such that a position of
the contact member can be changed between a first position and a
second position; wherein the first position is capable of pressing
the bundled portion so that the upstream side end portion and the
downstream side end portion are simultaneously depressed to
flatten; and wherein the second position is capable of depressing
to flatten the flow path middle portion between the upstream side
end portion and the downstream side end portion.
17. The tube pump as set forth in claim 13, wherein the tube
includes a plurality of tubes.
18. The tube pump as set forth in claim 17, wherein the tubes has a
tube connecting portion which connects adjacent tubes of the
tubes.
19. The tube pump as set forth in claim 13, wherein only a single
one of the contact member is provided on the supporting member.
20. A liquid ejecting apparatus, comprising: a tube pump,
including: a tube; a casing, containing a flow path middle portion
of the tube; and a pressing member, pressing the flow path middle
portion against an inner wall of the casing, wherein the pressing
member includes: a contact member, facing to the casing through the
tube; and an urging member, urging the contact member to the tube
by an elastic force.
21. The liquid ejecting apparatus as set forth in claim 20, wherein
the flow path middle portion is contained along the inner wall of
the casing so as to draw in a .OMEGA. shape; and wherein the tube
has a bundled portion in which an upstream side end portion and a
downstream side end portion of the flow path middle portion are
overlapped in a state that directions of liquid flow in the
upstream side end portion and the downstream side end portion are
reverse to each other.
Description
BACKGROUND OF THE INVENTION
[0001] The present invention relates to a tube pump, a tube for the
tube pump and a liquid ejecting apparatus.
[0002] In a related art, by depressing to flatten a tube by a tube
pump main body from an upstream side to a downstream side of the
tube, the tube pump transports an ink fluid in the tube which is
depressed to flatten to downstream. Here, there is a case of using
a plurality of tubes to increase a flow rate of the tubes. Further,
there is a tube in which outer peripheries of a plurality of tube
main bodies are connected directly with an object of facilitating
an operation of assembling the tube (for example, refer to
JP-A-2001-193670).
[0003] However, in the case of the tube connecting the plurality of
tube main bodies, when the tube pump depresses to flatten the tube,
the contiguous tube main bodies are deformed to push each other.
Thereby, a load necessary for depressing to flatten the tube
becomes larger than a load in the case of depressing to flatten a
single one of the plurality of tube main bodies multiplied by a
number of pieces of the tube main bodies to thereby pose a problem
that torque for driving the tube pump is increased and a motor for
driving the tube pump becomes large-sized.
[0004] Also, a length of the tube contained in the pump holder is
adjusted by visual observation after the tube has been arranged to
be along the inner wall of the pump holder. Therefore, there is a
case in which the length of the tube is not adjusted optimally.
[0005] Further, an ink jet printer has widely been used as a
related liquid ejecting apparatus for ejecting a liquid to a target
via a liquid ejecting head. Further, in such an ink jet printer, at
a recording head as a liquid ejecting head, there is a concern that
printing is not carried out excellently since ink at a vicinity of
a nozzle becomes viscous or bubbles are mixed into the nozzle.
Hence, there have been proposed a number of head cleaning
mechanisms for recovering the liquid ejecting head.
[0006] There is known a head cleaning mechanism for covering the
nozzle of the recording head by a cap, driving a pump provided in
an ink discharge path communicated with the cap and sucking ink
from the nozzle by utilizing pressure (negative pressure) generated
by a pump.
[0007] Further, as one of the pumps, a second related tube pump 101
as shown in FIG. 19 is known. The tube pump 101 includes a flexible
tube 103 provided in a shape of a circular arc along a casing 102,
a roller 104 for pressing the flexible tube 103 and a rotating
member 105 for supporting the roller 105. That is, the flexible tub
103 is arranged substantially over a half periphery of the casing
102 along an inner wall of the casing 102. Further, by rotating the
rotating member 105, the roller 104 is moved while successively
depressing to flatten the flexible tube 103, thereby, pressure in
the flexible tube 103 upstream from a portion thereof contained in
the casing 102 is reduced.
[0008] Further, when the tube pump 101 is provided with only one of
the roller 104, in accordance with rotation of the rotating member
105, a state in which the roller 104 depresses to flatten the
flexible tube 103 and a state in which the roller 104 does not
depress to flatten the flexible tube 103 are repeated. Therefore,
when the flexible tube 103 is not depressed to flatten the roller
104, upstream and downstream thereof are brought into a
communicating state and there is a possibility that negative
pressure accumulated on the upstream side is extinguished. As a
result, generation of pressure is intermittent, accumulation of
pressure is difficult and there is a concern that pertinent
negative pressure cannot be generated at inside of the cap.
[0009] Hence, there is a constitution in which the rotating member
105 is provided with two or more of the rollers 104 and when the
rotating member 105 is rotated, at least one of the rollers 104 is
necessarily depressed to flatten the flexible tube 103 to thereby
enable to accumulate the negative pressure. However, by providing
two or more of the rollers 104, there poses a problem that the
apparatus is complicated and cost is increased.
[0010] Hence, as shown in FIG. 20, there is proposed the tube pump
101 provided with the flexible tube 103 intersected by 360.degree.
or more, that is, in a shape of a along the casing 102 (for
example, refer to JP-A-2001-301195). Further, thereby, the flexible
tube 103 includes an overlapped portion 107 and even when there is
only one of the roller 104, the roller 104 can always depress to
flatten the flexible tube 103. As a result, the upstream side of
the tube pump 101 is not opened intermittently to the downstream
side and negative pressure can be continuously accumulated to the
upstream side.
[0011] However, since the tube pump 101 of the related art includes
the overlapped portion 107, there poses a problem that a space in a
direction along a rotating shaft is increased.
SUMMARY OF THE INVENTION
[0012] It is therefore an object of the present invention to
provide a tube for a tube pump capable of downsizing a motor for
driving the tube pump, a tube pump capable of adjusting a length of
a tube used in the tube pump optimally, and a tube pump and a
liquid ejecting apparatus capable of simplifying and downsizing
structure of apparatus. The object is achieved by a combination of
characteristics described in independent claims in the scope of
claims. Further, dependent claims prescribe a further advantageous
specific example of the invention.
[0013] In order to achieve the above object, according to the
present invention, there is provided a tube for a tube pump,
comprising:
[0014] a plurality of tube bodies, each including a flow path;
and
[0015] a tube connecting portion, connecting the tube bodies
separately from each other so as to escape wall thicknesses of the
tube bodies in a state that the tube is depressed to flatten.
[0016] Thereby, a load necessary for depressing to flatten the tube
can be reduced in comparison with that of the case of directly
connecting outer peripheries of the plurality of tube main bodies
and the tube pump can be downsized.
[0017] Preferably, the tube is depressed to flatten by a load given
by multiplying a load for depressing a single tube body of the tube
bodies to flatten by substantially a number of the tube bodies of
the tube. In the above configuration, a total of the tube can be
depressed to flatten by a total of loads of depressing to flatten
the individual tubes.
[0018] Preferably, the tube includes at least two tube bodies
connected by the tube connecting portion. A diameter of each of the
tube bodies is 4.6 mm, a wall thickness thereof is 1 mm, and a
distance between centers of adjacent tube bodies of the at least
two tube bodies is 5.1 mm. In the above configuration, the tube can
sufficiently be depressed to flatten even when the load of
depressing to flatten the tube for the tube pump is substantially
twice as much as a load when one of the tube main bodies is
depressed to flatten.
[0019] Preferably, the tube connecting portion separates the tube
bodies from each other in a state that the tube is not depressed to
flatten. The tube makes the tube bodies proximate to each other in
a state that the tube is depressed to flatten. Thereby, the tube
pump can be downsized within a range in which the contiguous tube
main bodies are not deformed to push each other.
[0020] Here, it is preferable that, the tube connecting portion is
buckled so as to make the tube bodies proximate to each other when
the tube is depressed to flatten. Thereby, it is reduced that the
tube for the tube pump becomes difficult to be depressed to flatten
by the tube connecting portion.
[0021] Preferably, the tube connecting portion connects the tube
bodies substantially at a center of the tube bodies in a direction
of depressing the tube bodies to flatten. Thereby, the respective
tube main bodies connected to the tube connecting portion are
uniformly depressed to flatten.
[0022] According to the present invention, there is also provided A
tube pump, comprising:
[0023] a tube, drawn out in a shape of a ring;
[0024] a tube pump body, including a roller, and rotating the
roller for depressing to flatten the tube from an inner side of the
ring;
[0025] a pump holder, having substantially a cylindrical shape, and
containing the tube pump body and the tube therein; and
[0026] a tube holder, detachably mounted on the pump holder, and
holding the tube in the shape of the ring as a ring portion by
overlapping an upstream side portion extended upstream from the
ring portion of the tube and a downstream side portion extended
downstream from the ring portion of the tube.
[0027] In the above configuration, a length of the ring portion of
the tube can previously be adjusted before the tube is arranged to
be along an inner wall of the pump holder. Therefore, the length of
the ring portion of the tube is made to be easy to adjust
optimally.
[0028] Preferably, the tube holder is detachably mounted on the
pump holder in a direction intersecting with the ring portion of
the tube. Thereby, the tube becomes easy to integrate to the pump
holder.
[0029] Preferably, the tube includes a plurality of tube bodies.
The tube holder includes a positioning projection projected along a
longitudinal direction of the tube bodies for positioning the tube
bodies. Thereby, the plurality of tube bodies can firmly be
positioned to the tube holder.
[0030] Preferably, the tube holder holds the tube in a state of
bending the tube. Thereby, the tube is difficult to draw from the
tube holder even when the tube is subjected to a pulling force.
[0031] Preferably, the tube holder includes a tube holder body and
a tube holder lid. The tube holder body and the tube holder lid
holds the tube at a clearance therebetween. The clearance is
smaller than an outer diameter of the tube in a sate that the tube
holder is attached to the pump holder. Therefore, even when a force
of fitting the tube holder main body and the tube holder lid is
small, the tube is firmly held by the pump holder along with the
tube holder.
[0032] According to the present invention, there is also provided a
tube pump, comprising:
[0033] a tube;
[0034] a tube pump body, including a roller, and rotating the
roller for depressing to flatten the tube; and
[0035] a pump holder, having substantially a cylindrical shape, and
containing the tube pump body and the tube therein,
[0036] wherein the tube has a curve portion, an upstream side
portion extended upstream from the curve portion, and a downstream
side portion extended downstream from the curve portion; and
[0037] wherein the tube is drawn out from the tube pump body so as
to overlap the upstream side portion and the downstream side
portion being parallel each other.
[0038] According to the present invention, there is also provided a
tube pump, comprising
[0039] a tube;
[0040] a casing, containing a flow path middle portion of the tube;
and
[0041] a pressing member, pressing the flow path middle portion
against an inner wall of the casing,
[0042] wherein the pressing member includes:
[0043] a contact member, facing to the casing through the tube;
and
[0044] an urging member, urging the contact member to the tube by
an elastic force.
[0045] Preferably, the flow path middle portion is contained along
the inner wall of the casing so as to draw in a .OMEGA. shape. The
tube has a bundled portion in which an upstream side end portion
and a downstream side end portion of the flow path middle portion
are overlapped in a state that directions of liquid flow in the
upstream side end portion and the downstream side end portion are
reverse to each other.
[0046] In the above configuration, the flow path middle portion of
the flexible tube is arranged in the casing to draw the character
.OMEGA. shape and therefore, the flexible tube is not provided with
an overlapped portion formed when, for example, the flexible tube
is intersected in an .alpha.-like shape. As a result, an extra
space for the overlapped portion needs not to ensure and the tube
pump can be downsized. Further, the contact member presses the
flexible tube by the elastic force by the urging memver and
therefore, the flexible tube is flexibly pressed by the contact
member. As a result, even the flexible tube disposed at the bundled
portion and the flexible tube disposed at other portion can
similarly be depressed to flatten. Therefore, the upstream side end
portion and the downstream side end portion can simultaneously be
depressed to flatten. As a result, even when the flow path middle
portion of the flexible tube is constituted in the .OMEGA.-like
shape and is not provided with the overlapped portion, some portion
of the flexible tube can always be depressed to flatten by the
single contact member and pressure can be accumulated continuously
in the flexible tube by a simple constitution. Further, pressure
can be accumulated in a shorter period of time than in the case of
accumulating pressure discontinuously.
[0047] Preferably, the inner wall of the casing is formed in a
cylindrical shape. The urging member includes a rotating member,
rotated with a center of the inner wall as an axis center, a
supporting member, supported on the rotating member so that a
distance of the contact member from the axis center can be changed,
and supporting the contact member, an elastic member, disposed
between the rotating member and the supporting member, and urging
the supporting member by the elastic force such that the contact
member is separated from the axis center.
[0048] In the above configuration, the casing is formed in the
cylindrical shape, the urging member is constituted by three
members of the rotating member, the supporting member and the
elastic member and therefore, the constitution of the tube pump can
be simplified. Further, pressure of the tube pump can smoothly be
accumulated despite the simple constitution.
[0049] Preferably, the supporting member is supported on the
rotating member such that a position of the contact member can be
changed between a first position and a second position. The first
position is capable of pressing the bundled portion so that the
upstream side end portion and the downstream side end portion are
simultaneously depressed to flatten. The second position is capable
of depressing to flatten the flow path middle portion between the
upstream side end portion and the downstream side end portion.
[0050] In the above configuration, even when the flow path middle
portion of the tube is constituted by the .OMEGA.-like portion and
is not provided with the overlapped portion, some portion of the
flexible tube can always be depressed to flatten by the single
contact member and pressure can be accumulated continuously in the
flexible tube by a simple constitution. Further, pressure can be
accumulated in a shorter period of time than in the case of
accumulating pressure discontinuously.
[0051] Preferably, the tube includes a plurality of tubes.
Particularly, a plurality of the flexible tubes are provided to
single ones of the casing and the pressing member.
[0052] In the above configuration, since the plurality of flexible
tubes are provided, a sucking function of the tube pump can be
increased. Further, even when the plurality of flexible tubes are
provided, the flexible tube is not provided with the overlapped
portion and therefore, even when two pieces of the flexible tubes
are used to increase the sucking function, a space of containing
two pieces of the flexible tubes may be provided in the casing and
the space is saved.
[0053] Preferably, the tubes has a tube connecting portion which
connects adjacent tubes of the tubes.
[0054] In the above configuration, the plurality of tubes are
connected to constitute one aggregation and therefore, the
plurality of tubes are easy to deal with and operation of
integrating the flexible tubes to the tube pump is facilitated.
[0055] Preferably, only a single one of the contact member is
provided on the supporting member.
[0056] In the above configuration, only one of the contact member
is provided and therefore, the structure can be simplified.
Further, even when only one of the contact member is provided, the
upstream side end portion and the downstream side end portion can
simultaneously be depressed to flatten and even when the flow path
middle portion of the flexible tube is not provided with the
overlapped portion, some portion of the flexible tube can always be
depressed to flatten by the single contact member and pressure can
be accumulated continuously in the flexible tube.
[0057] According to the present invention, there is also provided a
liquid ejecting apparatus, comprising:
[0058] a tube pump, including:
[0059] a tube;
[0060] a casing, containing a flow path middle portion of the tube;
and
[0061] a pressing member, pressing the flow path middle portion
against an inner wall of the casing,
[0062] wherein the pressing member includes:
[0063] a contact member, facing to the casing through the tube;
and
[0064] an urging member, urging the contact member to the tube by
an elastic force.
[0065] Preferably, flow path middle portion is contained along the
inner wall of the casing so as to draw in a 0 shape. The tube has a
bundled portion in which an upstream side end portion and a
downstream side end portion of the flow path middle portion are
overlapped in a state that directions of liquid flow in the
upstream side end portion and the downstream side end portion are
reverse to each other.
[0066] In the above configuration, the flow path middle portion of
the tube is arranged in the casing to draw in the .OMEGA. shape and
therefore, the tube is not provided with the overlapped portion
formed when, for example, the tube is intersected in an
.alpha.-like shape. As a result, an extra space for the overlapped
portion needs not ensure and downsizing of the tube pump and
downsizing of the liquid injecting apparatus can be achieved.
Further, since the contact member presses the flexible tube by the
elastic force by the urging member, the flexible tube is flexibly
pressed by the contact member. As a result, even the flexible tube
disposed at the bundled portion and the flexible tube disposed at
other portion can similarly be depressed to flatten. Therefore, the
upstream side end portion and the downstream side end portion can
simultaneously be depressed to flatten. As a result, even when the
flow path middle portion of the flexible tube is constituted by the
.OMEGA.-like shape and is not provided with the overlapped portion,
some portion of the flexible tube can always be depressed to
flatten by the single contact member and pressure can be
accumulated continuously in the flexible tube by the simple
constitution. Further, pressure can be accumulated in a shorter
period of time than in the case of accumulating the pressure
discontinuously.
[0067] Further, the above-described summary of the invention does
not enumerate all of characteristics necessary for the invention
but a sub combination of the group of characteristics can
constitute the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
[0068] The above objects and advantages of the present invention
will become more apparent by describing in detail preferred
exemplary embodiments thereof with reference to the accompanying
drawings, wherein:
[0069] FIG. 1 is a partial perspective view of an ink jet type
recording apparatus according to a first embodiment of the
invention;
[0070] FIG. 2 is a sectional view of a tube according to the
embodiment;
[0071] FIG. 3 illustrates sectional views showing a state of
depressing to flatten the tube;
[0072] FIG. 4 is a disassembled perspective view viewing a tube
pump according to the embodiment from a skewed lower direction;
[0073] FIG. 5 is a disassembled perspective view viewing the tube
pump according to the embodiment from a skewed upper direction;
[0074] FIG. 6 is an outline perspective view of a printer according
to a second embodiment of the present invention;
[0075] FIG. 7 is an outline constitution view of an essential
portion of the printer according to the embodiment;
[0076] FIG. 8 is a partially disassembled perspective view of a
tube pump according to the embodiment;
[0077] FIG. 9 is a partially sectional view of a discharging tube
according to the embodiment;
[0078] FIG. 10 is a partially disassembled perspective view of a
pressing device according to the embodiment;
[0079] FIG. 11 is a perspective view of a rotating member according
to the embodiment;
[0080] FIG. 12 is a front view of the pressing device according to
the embodiment;
[0081] FIG. 13 is a plane view of the pressing device according to
the embodiment;
[0082] FIG. 14 is a front view of the pressing device according to
the embodiment;
[0083] FIG. 15 is a plane view of the pressing device according to
the embodiment;
[0084] FIG. 16 is a partially broken plane view of the tube pump
according to the embodiment;
[0085] FIG. 17 is a partially broken plane view of the tube
pump;
[0086] FIG. 18 is a partially broken plane view of the tube pump
according to the embodiment;
[0087] FIG. 19 is an outline constitution view of a tube pump
according to a related art; and
[0088] FIG. 20 is an outline constitution view of a tube pump
according to a related art.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0089] Although an explanation will be given of the invention
through embodiments of the invention as follows, the following
embodiments do not limit the invention according to the scope of
claims and all of combinations of characteristics to be explained
in the embodiments are not necessarily indispensable in resolving
means of the invention.
[0090] FIG. 1 is a partial perspective view of an ink jet type
recording apparatus 10 according to the first embodiment of the
invention. The ink jet type recording apparatus 10 is provided with
a feed motor 41 used for feeding a recorded object 11, a recording
portion 40 for recording on the fed recorded object 11, and a
discharge roller 20 for discharging the recorded object 11 in this
order in a feeding direction. The ink jet type recording apparatus
10 is further provided with an ink transporting portion 70 for
transporting discharged ink, wiping portion 80 and a drive portion
50.
[0091] The recording portion 40 includes a carriage 42 for mounting
an ink cartridge, a recording head 44 provided at a face of the
carriage 42 opposed to the recorded object 41 for delivering ink, a
shaft hole 46 provided at the carriage 42, a guide shaft 48
inserted into the shaft hole 46 for slidably supporting the
carriage 42 in a direction substantially orthogonal to the feeding
direction, a timing belt 402, a carriage motor 404, a black ink
cartridge 406 and a color ink cartridge 408.
[0092] The black ink cartridge 406 and the color ink cartridge 408
are mounted detachably to an upper portion of the carriage 42 for
supplying black ink and color ink to the recording head 44. The
recording head 44 includes a delivery port for black ink and a
delivery port for color ink as a plurality of delivery ports
aligned along the feeding direction of the recorded object 11.
[0093] The ink transporting portion 70 includes capping member 72
arranged at a non-recording region (home position) outside of a
recording region (feed path of the recorded object 11) for sealing
the delivery ports of the recording head 44, a tube 75 for
transporting ink which is ejected from the delivery ports to the
capping member 72, a tube pump 76 for transporting ink in the tube
75 from upstream to downstream by elastically deforming a portion
of the tube 75, and a waste solution box 79 for accumulating ink
transported by the tube pump 76 in this order in a direction of
transporting ink. That is, an upstream side of the tube 75
communicates with the capping member 72 and a downstream side of
the tube 75 communicates with the waste solution box 79. The waste
solution box 79 includes an absorbing member for absorbing an ink
waste solution at inside thereof and accumulates the received ink
waste solution at inside thereof.
[0094] The wiping portion 80 has an elasticity and arranged at a
vicinity of an end portion of the capping member 72 on a side of
the recording region. The drive portion 50 drives the feed motor 41
and the carriage motor 404.
[0095] In the above, the carriage motor 404 drives the timing belt
402 so that the carriage 42 is reciprocally moved substantially
orthogonal to the feeding direction of the recorded object 11 while
being guided by the guide shaft 48. The ink jet type recording
apparatus 10 delivers ink from the recording head 44 while
reciprocating the carriage 42. The ink jet type recording apparatus
10 carries out recording operation on a total of the recorded
object 11 by feeding the recorded object 11 at each scan. The
recording head 44 may carry out recording operation in both of a
going path and a returning path or may carry out recording
operation only in one of the paths.
[0096] When recording operation is not carried out by the ink jet
type recording apparatus 10, the carriage 42 moves from the
recording region to the non-recording region. When the recording
head 44 provided on the carriage 42 is moved right above the
capping member 72, the capping member 72 moves up to the side of
the carriage 42 and seals a face of the recording head 44 having
the delivery ports.
[0097] In the sealed state, the tube pump 76 sucks air at an inner
space formed by the recording head 44 and the capping member 72 so
that ink is forcibly sucked to discharge from the delivery ports of
the recording head 44 to enable to clean a delivery port. The
capping member 72 can prevent the delivery ports from being dried
by sealing the face of the recording head 44 having the delivery
ports. Further, in flushing for making the recording head 44 idly
deliver ink drops, the capping member 72 receives the idly
delivered ink. The flushing is carried out by applying a drive
signal which is not related to recording to the recording-head
44.
[0098] The carriage 42 is firstly separated from the capping member
72 when returning from the non-recording region to the recording
region. Further, in accordance with movement of the carriage 42 to
the side of the non-recording region, the wiping portion 80
advances onto a movement path of the recording head 44 to wipe ink
on a nozzle forming face of the recording head 44.
[0099] In the tube pump of the related ink jet type recording
apparatus, a length of a ring-like portion of the tube is adjusted
by visual observation after the tube has been arranged in a
ring-like shape at inside of the tube pump. Therefore, there is a
case in which the length of the ring-like portion of the tube is
not adjusted optimally. Further, an upstream portion and a
downstream portion of the tube are held in the tube pump
respectively by being shifted in a direction intersected with the
ring-like portion of the tube. Therefore, there poses a problem
that a space for holding the upstream portion and the downstream
portion of the tube is enlarged and the tube pump is
large-sized.
[0100] Also, the first related tube pump transports ink to the
downstream side of the tube by depressing to flatten the tube from
the upstream side to the downstream side. Here, there is a case of
providing a plurality of the tubes between the capping member and
the waste solution box in order to increase an amount of
transporting ink.
[0101] Further, there is the tube in which outer peripheries of a
plurality of tube main bodies are directly connected with an object
of facilitating operation of integrating the tube.
[0102] In this case, when the tube pump depresses to flatten the
tube, contiguous tube main bodies are deformed to push each other.
Thereby, a load necessary for depressing to flatten a plurality of
tube main bodies becomes larger than a load in the case of
depressing to flatten a single one of the tube main body multiplied
by a number of pieces of the tube main bodies to thereby pose a
problem that torque for driving the tube pump is increased and a
motor for driving the tube pump becomes large-sized.
[0103] FIG. 2 is a sectional view of the tube 75. FIG. 3
illustrates sectional views showing a state in which the tube 75 is
depressed to flatten, FIG. 3A shows a state in which a tube
connecting portion 750 is not buckled and FIG. 3B shows a state in
which the tube connecting portion 750 is buckled. The tube 75
includes a plurality of tube main bodies 75a and 75b each having a
flow path and the tube connecting portion 750 for connecting the
plurality of tube main bodies 74a and 74b separately from each
other. The tube connecting portion 750 escapes wall thicknesses of
the plurality of tube main bodies when the tube for the tube pump
is depressed to flatten.
[0104] The tube connecting portion 750 connects the plurality of
tube main bodies 75a and 75b substantially at a center in a
direction of depressing to flatten the plurality of tube main
bodies 75a and 75b. As shown in FIG. 2, the tube connecting portion
750 separates the plurality of tube main bodies 75a and 75b from
each other in a state in which the tube 75 is not depressed to
flatten. Further, as shown in FIGS. 3A and 3B, the tube connecting
portion 750 makes the plurality of tube main bodies 75a and 75b
proximate to each other when the tube 75 is depressed to flatten.
FIG. 3A shows a state in which the tube connecting portion 750 is
contracted and the plurality of tube main bodies 75a and 75b become
proximate to each other to thereby escape wall thicknesses thereof.
FIG. 3B shows a state in which the tube connecting portion 750 is
buckled and the plurality of tube main bodies 75a and 75b become
proximate to each other to thereby escape the wall thicknesses.
[0105] As described above, a load necessary for pressing to flatten
the tube becomes smaller than that in the case of directly
connecting the outer peripheries of the plurality of tube main
bodies. Therefore, the torque for driving the tube pump 76 can be
reduced, and the motor for driving the tube pump 76 and therefore,
the tube pump 76 can be downsized. Further, the tube pump 76 can be
downsized in a range in which the contiguous tube main bodies 75a
and 75b are not deformed to push each other.
[0106] Further, the tube connecting portion 750 connects the
plurality of tube main bodies 75a and 75b substantially at the
center in a direction of depressing to flatten the plurality of
tube main bodies 75a and 75b to thereby uniformly depress to
flatten the respective tube main bodies 75a and 75b.
[0107] In the firs related tube pomp, when the tube is depressed to
flatten by a small load, there is a concern that one of the tube
main bodies is not sufficiently depressed to flatten. In this case,
a flow rate of a total of the tube is reduced because ink at inside
of the tube main body is not sufficiently pushed out. However,
according to the embodiment, the respective tube main bodies 75a
and 75b are uniformly depressed to flatten and therefore, the flow
rate of the total of the tube 75 is prevented from being reduced
owing to the above-described.
[0108] Further, the tube 75 is made to be less difficult to be
depressed to flatten by the tube connecting portion 750 by buckling
the tube connecting portion 750 when the tube 75 is depressed to
flatten.
[0109] The load of depressing to flatten the tube 75 is the load of
depressing to flatten one of the plurality of tube main bodies 75a
and 75b multiplied by the number of pieces of the tube main bodies,
that is, multiplied by two. In this case, the tube 75 is
sufficiently depressed to flatten such that the load of depressing
to flatten the tube 75 is not larger than the load when one of the
plurality of tube main bodies 75a and 75b is depressed to flatten
multiplied substantially by the number of pieces of the tube main
bodies, that is, substantially multiplied by two.
[0110] Further, according to the embodiment, a diameter R of one of
the two tube main bodies 75a and 75b is 4.6 mm, a wall thickness t
is 1 mm and a distance d between centers of the two tube main
bodies 75a and 75b is 5.1 mm. In this case, the tube 75 is
sufficiently depressed to flatten even when the load of depressing
to flatten the tube 75 is twice as much as the load when one of the
tube main bodies 75a and 75b is depressed to flatten.
[0111] FIG. 4 is a disassembled perspective view viewing the tube
pump 76 according to the embodiment from a skewed lower direction.
FIG. 5 is a disassembled perspective view viewing the tube pump 76
from a skewed upper direction. The tube pump 76 includes a pump
holder 760 for holding the tube 75, a tube holder 77 for pinching
the tube 75 to fix to the pump holder 760, and a tube pump main
body 790 driven to rotate by power from outside. Further, the tube
holder 77 includes a tube holder main body 770 and a tube holder
lid 780. In FIG. 5, the tube 75 and the tube pump main body 790 are
omitted for simplicity.
[0112] The pump holder 760 has a substantially cylindrical shape.
The pump holder 760 includes a first guide groove 762 and a second
guide groove 764 for fixing the tube holder main body 770 to the
pump holder 760 and a tube support face 766 for restricting an
outer shape of the tube 75 in a shape of a circular arc.
[0113] The tube holder main body 770 includes a notch 772 and a
locking claw 779 to be engaged with the tube holder lid 780, a
first engaging portion 774 and a second engaging portion 776 to be
engaged with the pump holder 760, a tube contact face 777 brought
into contact with the tube 75 and a positioning projection 778 for
positioning the tube 75.
[0114] The tube contact face 777 is formed to bend along a length
direction of the tube 75. The positioning projection 778 is
slenderly formed on the tube contact face 777 to be along the
length direction of the tube 75 and along the tube connecting
portion 750 of the tube 75.
[0115] The tube holder lid 780 includes a projection 782 to be
engaged with the notch 772 of the tube holder main body 770, a tube
contact face 783 brought into contact with the tube 75, a
positioning projection 784 for positioning the tube 75, a shift
preventing projection 785 for preventing shift of the tube 75, and
a recessed portion 786 for locking the locking claw 779 of the tube
holder main body 770.
[0116] The tube contact face 783 is formed to bend along the length
direction of the tube 75. The positioning projection 784 is
slenderly formed to project on the tube contact face 783 to be
along the length direction of the tube 75 and along the tube
connecting portion 750 of the tube 75. The shift preventing
projections 785 are respectively formed at a portion at which the
tube main bodies 75a and 75b are brought into contact with each
other on the tube contact face 783. Further, the shift preventing
projection 785 is slenderly formed in a direction intersecting with
the positioning projection 784. Further, although not illustrated,
also the tube holder main body 770 is formed with a projection
similar to the shift preventing projection 785 on the tube contact
face 777.
[0117] The tube pump main body 790 includes a roller 792 rotatably
attached to the tube pump main body 790 for depressing to flatten
the tube 75 from an inner side of the ring.
[0118] In the above constitution, the tube holder lid 780 and the
tube holder main body 770 pinch the tube 75 in a ring-like shape
such that the tube 75 becomes a ring-like shape and an upstream
side extended portion extended upstream from a ring-like portion of
the tube 75 and a downstream side extended portion extended
downstream from the ring-like portion of the tube 75 overlap.
[0119] Further, the tube holder lid 780 is fitted together with the
tube holder main body 770 by engaging the projection 782 of the
tube holder lid 780 to the notch 772 of the tube holder main body
770 and locking the locking claw 779 of the tube holder main body
770 to the recessed portion 786 of the tube holder lid 780. In this
case, the upstream side extended portion and the downstream side
extended portion of the tube 75 overlapped to each other are held
by the tube holder 77 by respectively being brought into contact
with the tube contact face 777 and the tube contact face 783.
[0120] Under the state, the respective tube connecting portions 750
of the upstream side extended portion and the downstream side
extended portion of the tube 75 overlapped to each other are
positioned along the positioning projection 778 of the tube holder
main body 770 and the positioning projection 784 of the tube holder
lid 780. Thereby, movement of the tube 75 in the diameter direction
of the tube 75 is restricted.
[0121] By restricting movement of the tube 75 in the diameter
direction, one of the tube main bodies 75a and 75b is prevented
from being compressed. Thereby, the flow rate of the total of the
tube 75 is prevented from being reduced owing to a reduction in a
flow path sectional area of one of the tube main bodies 75a and
75b.
[0122] Further, the tube 75 is held by the tube holder 77 in a bent
state by being pinched between the tube contact face 777 and the
tube contact face 783 both of which are bent. Thereby, a resistance
between the tube 75 and the tube contact face 777 or the tube
contact face 783 becomes larger than that in the case in which the
tube 75 is held by the tube holder 77 in a straight state. Thereby,
even when the tube 75 is subjected to external force, the tube 75
is difficult to shift from the tube holder 77.
[0123] Further, by forming the shift preventing projection 785 on
the tube contact face 783 and forming a similar projection also on
the tube contact face 777, the projections constitute a resistance
when the tube 75 is moved. Thereby, the upstream side extended
portion and the downstream side extended portion of the tube 75 are
respectively difficult to shift from the tube holder 77 even when
subjected to external force.
[0124] Further, the projections of the shift preventing production
785 and the like are respectively formed at a portion at which the
tube main bodies 75a and 75b are brought into contact with each
other on the tube contact face 777 and the tube contact face 783
and therefore, both of the tube main bodies 75a and 75b are
difficult to shift from the tube holder 77 even when subjected to
external force. Further, one of the tube main bodies 75a and 75b is
prevented from being shifted from other thereof in the length
direction of the tube 75.
[0125] Next, the tube holder 77 is mounted to the pump holder 760
by engaging the first engaging portion 774 and the second engaging
portion 776 of the tube holder main body 770 to the first guide
groove 762 and the second guide groove 764 of the pump holder 760.
In this way, the tube 75 pinched by the tube holder 77 is held by
the pump holder 760 to constitute the ring-like shape in a state of
overlapping the upstream side extended portion and the downstream
side extended portion. Here, a direction of attaching and detaching
the tube holder 77 to and from the pump holder 760 is a direction
intersecting with the ring of the tube 75.
[0126] Thereby, the upstream side extended portion and the
downstream side extended portion of the tube 75 are held by the
pump holder 760 at one location. Therefore, a space of holding the
upstream portion and the downstream portion is reduced and the pump
holder 760 is downsized in comparison with a case of holding the
upstream side and the downstream side of the tube 75 respectively
at the pump holder 760 by shifting in a direction intersecting with
the ring-like portion.
[0127] Further, a length of the ring-like portion of the tube 75 is
determined by being held by the tube holder 77 and therefore, the
ring-like portion of the tube 75 can be adjusted to a desired
length before arranging the tube 75 to be along the inner wall of
the pump holder 760. Thereby, operational performance is promoted
in comparison with that in the case of adjusting the length of the
ring-like portion of the tube 75 while integrating the tube 75 to
the pump holder 760.
[0128] Further, according to the embodiment, by integrating the
tube 75 to the pump holder 760, the tube 75 is simultaneously
positioned to the tube supporting face 766.
[0129] Thereby, operational performance is promoted in comparison
with that in the case of positioning the tube 75 to the tube
supporting face 766 after integrating the tube 75 to the pump
holder 760.
[0130] Further, the direction of attaching and detaching the tube
holder to and from the pump holder 760 is a direction intersecting
with the ring of the tube 75 and therefore, the tube 75 can be
attached and detached to and from the pump holder 760 without
operating excessive external force to the tube 75.
[0131] Further, an interval between the tube holder 770 and the
tube holder lid 780 when the tube holder 77 is attached to the pump
holder 760 is smaller than an outer diameter of the tube 75.
Thereby, when the tube holder 77 is attached to the pump holder
760, the tube holder 770 and the tube holder lid 780 fasten the
tube 75. Therefore, even when a force of fitting the tube holder
main body 770 and the tube holder lid 780 is small, the tube 75 is
firmly held by the pump holder 760 along with the tube holder
77.
[0132] Next, when the tube 75 is contained in the pump holder 760,
the outer shape of the ring of the tube 75 is restricted to the
shape of the circular arc along the tube supporting face 766. By
containing the tube pump main body 790 in the ring of the tube 75
under the state, the tube 75 is drawn around the tube pump main
body 790.
[0133] When the tube pump main body 790 is rotated by power from
outside under the state, the roller 792 successively depresses to
flatten one point of the tube 75 from upstream to downstream.
Thereby, the tube pump main body 790 transports the ink waste
solution at inside of the tube 75 depressed to flatten to
downstream. The tube 75 depressed to flatten recovers by an elastic
force of the tube 75 per se to produce negative pressure at inside
of the tube 75. By conducting the negative pressure to the upstream
side of the tube 75, the ink waste solution on the upstream side of
the tube 75 is sucked. The tube pump main body 79 transports the
ink waste solution on the upstream side of the tube 75 to the waste
solution box 79 on the downstream side of the tube 75 by repeating
the processes.
[0134] As is apparent from the above-described explanation,
according to the tube pump 76 of the embodiment, the length of the
ring-like portion of the tube 75 can previously be adjusted before
the tube 75 is arranged to be along the inner wall of the pump
holder 760. Therefore, the length of the ring-like portion of the
tube 75 is made to be easily to adjust optimally.
[0135] Next, the second embodiment of the invention will be
explained in reference to FIG. 6 through FIG. 18 as follows.
[0136] As shown in FIG. 6, in a printer 111 as a liquid ejecting
apparatus of the embodiment, a platen 113 is installed to a frame
112 thereof and paper P is fed on the platen 113 by a paper feed
mechanism, not illustrated. A carriage 115 is supported on the
frame 112 movably in a longitudinal direction of the platen 113 via
a guide member 116 and reciprocally moved by a carriage motor 117
via a timing belt 118.
[0137] Further, the carriage 115 is mounted with a recording head
120 on a lower side thereof. The recording head 120 is provided
with a nozzle delivery port, not illustrated, at a lower face
thereof and ink drops are delivered from the nozzle delivery port
by driving a piezoelectric element, not illustrated.
[0138] An ink cartridge 121 is detachably mounted on the carriage
115 and ink is supplied from the ink cartridge 121 to the recording
head 120. Therefore, printing is carried out by delivering ink from
the recording head 120 onto the paper P by driving the
piezoelectric element based on printing data.
[0139] A head cleaning mechanism 125 is provided at a non-recording
region (home position) at one side portion of the frame 112. As
shown in FIG. 6 and FIG. 7, the head cleaning mechanism 125 has a
cap holder 126 and a tube pump 128. The cap holder 126 is attached
to the frame 112 movably in an up and down direction by a
publicly-known lifting mechanism, not illustrated.
[0140] A cap 129 in a shape of a square frame is provided on the
cap holder 126. The cap 129 can seal the nozzle delivery port of
the recording head 120 by bringing an upper end edge thereof into
contact with the recording head 120. Further, as shown in FIG. 7,
the cap 129 is fixedly attached with a sponge 131 in a shape of a
sheet at a bottom portion thereof. The sponge 131 is opposed to the
nozzle delivery port of the recording head 120 at a predetermined
interval therebetween in a state of bringing the cap 129 into
contact with the recording head 120 for receiving ink delivered
from a nozzle of the recording head 120. Further, the cap 129 is
formed with a discharge port 132 to penetrate a bottom face
thereof.
[0141] The tube pump 128 sucks ink from the recording head 120 by
decompressing inside of the cap 129 in a state of sealing the
nozzle delivery port of the recording head 120, and discharges ink
to a waste ink tank 133 provided at inside of the frame 112.
[0142] In details, as shown in FIG. 8, the tube pump 128 is
provided with a casing 135, a discharging tube 136 and a pressing
device 137. The casing 135 is formed in a cylindrical shape in a
bottomed shape by a resin and is formed with a support hole 139 to
penetrate at a center of a bottom face 138 thereof. Further, a
portion of a side face of the casing 135 is formed with a notch
portion 141 to notch from an upper side to a lower side up to
before the bottom face 138. Further, the casing is projected with a
groove portion 142 an upper side of which is opened to extend from
the notch portion 141 to an outer side in a diameter direction of
the casing 135. Further, an inner side of the groove portion 142 of
the casing 135 is provided with two of fitting projected portions
143 and 144 extended in an up and down direction and the fitting
projected portions 143 and 144 are opposed to each other.
[0143] The discharging tube 136 is a tube formed of a flexible
member of silicone rubber or the like, as shown in FIG. 9. The
discharging tube 136 has two flexible tubes 146 and 147 according
to the embodiment and the flexible tubes 146 and 147 are connected
by an connecting portion 148 to integrate. Further, the flexible
tubes 146 and 147 are respectively formed with flow paths 146a and
147a therein.
[0144] Further, as shown in FIG. 8, according to the discharging
tube 136, in a state in which the respective flexible tubes 146 and
147 are aligned in an up and down direction, an upstream side end
portion 150 and a downstream side end portion 151 of a flow path
middle portion 149 are bundled such that flow directions thereof
are directed reverse to each other. As a result, a flow path middle
portion 149 draws substantially a shape of a circular arc. Further,
the upstream side end portion 150 and the downstream side end
portion 151 are bundled by a fastening portion 53 made of a resin
formed substantially in a shape of a rectangular parallelepiped to
form a bundled portion 152 and in details, the bundled portion 152
is formed by simultaneously inserting the upstream side end portion
150 and the downstream side end portion 151 into an inserting hole
53a provided at the fastening portion 49. Further, the fastening
portion 53 is formed with fitting grooves 54 and 55 to extend in
the up and down direction at two side faces thereof opposed to each
other.
[0145] Further, as shown in FIG. 7, an upstream side portion 136a
of the discharging tube 136 is connected to the discharge port 132
of the cap 129. Further, a downstream side portion 136b thereof is
connected to the waste ink tank 133.
[0146] Further, as shown in FIG. 8, the discharging tube 136 is
attached to the casing 135 by sliding the fastening portion 53
relative to the groove portion 142 of the casing 135 from the upper
side to the lower side to thereby engage the engaging grooves 54
and 55 of the fastening portion 53 respectively to the fitting
projected portions 143 and 144 of the groove portion 142. Further,
as a result, the flow path middle portion 149 of the discharging
tube 136 is contained along an inner wall 135a in a cylindrical
shape of the casing 135 and draws a character .OMEGA. when viewed
in a plane direction.
[0147] As shown in FIG. 10, the pressing device 137 is provided
with a rotating member 156, a torsional spring 157, a supporting
member 158, a contact member 159 and a retaining piece 160. The
rotating member 156 has a center shaft 161 and a circular disk
portion 162 integrally formed therewith by a resin. The center
shaft 161 is provided with a small diameter portion 163 and a large
diameter portion 164 having a diameter larger than that of the
small diameter portion 163 to align to dispose on an axis center A
shown in FIG. 10 successively from the upper side. At a middle of
the large diameter portion 164, the circular disk portion 162 is
provided to dispose on the axis center A at a center thereof and
orthogonal to the center shaft 161. Further, at a portion of the
large diameter portion 164 on a side upper than the circular disk
portion 162, there is formed a first fitting face 165 (refer to
FIG. 13, FIG. 15) having a shape notched to be flat in a direction
of the axis center A. Further, at a portion of the large diameter
portion 164 on a side lower than the circular disk portion 162,
there is formed a second fitting face 167 having a shape notched
from a lower side thereof to a middle thereof in the direction of
the axis center A.
[0148] The circular disk portion 162 is provided with an outer
diameter smaller than an inner diameter of the casing 135. Further,
the circular disk portion 162 is formed with an upper side circular
through hole 168 and an upper side rectangular through hole 169 to
penetrate along the axis center A direction. Respective sectional
shapes of the upper side circular through hole 168 and the upper
side rectangular through hole 169 constitute a circular shape and a
rectangular shape. Further, as shown in FIG. 11, the circular disk
portion 162 is provided with a projected portion 170 at a lower
face 162a thereof. The projected portion 170 has a first projected
portion 170a, a second projected portion 170b and a third projected
portion 170c provided to align successively from the upper side.
The first projected portion 170a is provided with a shape of a fan
centering on the axis center A and having a diameter smaller than
that of the circular disk portion 162 and the second projected
portion 170b is provided with the shape of a fan having a diameter
smaller than that of the first projected portion 170a. Further, the
third projected portion 170c is provided such that a sectional
shape thereof in a plane direction constitutes substantially a
triangular shape.
[0149] Further, in FIG. 11, respective left side faces of the first
projected portion 170a and the second projected portion 170b and
the third projected portion 170c are flushed with each other to
form a contact face 71. Further, in FIG. 11, respective right side
faces of the first projected portion 170a and the second projected
portion 170b are flush with each other. However, respective side
faces of the second projected portion 170b and the third projected
portion 170c are not flush with each other but form a stepped
difference portion 172.
[0150] As shown in FIG. 10, the torsional spring 157 is a spring
for generating a recovery force against torsion. The torsional
spring 157 has a coil portion 173 and two arms 173a and 173b formed
at end portions of the coil potion 173. An inner diameter of the
coil portion 173 is larger than an outer diameter of the large
diameter portion 164 of the center shaft 161 of the rotating member
156. The arm 173a and 173b are provided to extend in directions
orthogonal to the axis center A when the center axis of the coil
portion 173 is disposed on the axis center A. Further, the arm 173a
and the arm 173b are expanded to open by a predetermined angle.
[0151] The supporting member 158 is provided with a through
inserting hole 158a in parallel with the axis center A at a center
thereof and provided with an upper side plate 175 and a lower side
plate 176 substantially in a shape of a doughnut plate. Further,
the respective side plates 76 and 76 are disposed to be orthogonal
to the axis center A, connected by a junction portion 177 and
integrally formed by a resin.
[0152] The upper side plate 175 is provided with an outer diameter
smaller than that of the circular disk portion 162 of the rotating
member 156 and provided with an inner diameter larger than an outer
diameter of the torsional spring 157. Further, a portion thereof is
notched in a shape of a fan along the axis center A direction to
form an upper side plate side opening portion 75a. Further, an
upper face of the upper side plate 175 is projected with a first
upper side projected portion 78 and a second upper side projected
portion 179 in a cylindrical shape. Further, the upper side
projected portion 78 is formed in a size pivotably fitted to the
upper side circular through hole 168 formed at the rotating member
156. Further, the second upper side projected portion 179 is formed
in a size fitted to the upper side rectangular through hole 169 of
the rotating member 156 movably in the longitudinal direction of
the upper side rectangular through hole 169.
[0153] Further, a penetrated groove 181 is formed to penetrate the
upper side plate 175. In details, the penetrated groove 181 is
provided at a vicinity of a middle in a diameter direction of the
upper side plate 175 along a circumferential direction
substantially over a half periphery thereof and provided such that
a distance from a center of the upper side plate 175 is increased
as proceeding toward an arrow mark D1 direction of FIG. 10.
[0154] The lower side plate 176 is provided with an outer diameter
smaller than the outer diameter of the upper side plate 175 and is
provided with an inner diameter coinciding with the inner diameter
of the upper side plate 175. Further, a portion (not illustrated)
of an outer side face of the lower side plate 176 is provided with
a shape coinciding with a face 181a on an inner side of the through
penetrated groove 181 of the upper side plate 175 when viewed in a
plane direction. Further, the lower side plate 176 is provided with
two lower side projected portions (not illustrated) in a
cylindrical shape at a lower face thereof. Further, the lower side
projected portions are provided at positions overlapping the
respective upper side projected portions 178 and 179 when viewed in
a plane direction and sizes thereof are sizes similar to those of
the respective corresponding upper side projected portions 178 and
179.
[0155] A sectional shape of the junction portion 177 in a direction
orthogonal to the axis center A is a shape of a circular arc.
Further, the junction portion 177 is formed with a connecting
portion side opening portion 177a in a shape of being notched in a
shape of a fan along the axis center A continuously from the upper
side plate side opening portion 75a of the upper side plate 175. An
inner wall face 182 of the connecting portion side opening portion
177a on the right side of FIG. 10 is projected with a locking
projected portion 183. Further, the locking projected portion 183
is provided with a longitudinal direction thereof along the axis
center A and a lower end portion thereof is not brought into
contact with a lower face 184 of the connecting portion side
opening portion 177a. As a result, a stepped difference portion 185
is formed between the locking projected portion 183 and the lower
face 184 of the connecting portion side opening portion 177a.
Further, urging unit has the rotating member 156, the torsional
spring 157 and the supporting member 158.
[0156] The contact member 159 has a circular cylindrical portion
187 and shaft portions 188 and 189 (refer to FIG. 12) provided at
an upper face and a lower face of the circular cylindrical portion
187. Further, respective center axes of the circular cylindrical
portion 187 and the shaft portions 188 and 189 are disposed in a
shape of the same straight line in parallel with the axis center A.
Further, movement of the contact member 159 in the diameter
direction of the support member 58 is restricted by fitting the
shaft portion 188 on the upper side to the penetrated groove 181 of
the upper side plate 175 from the lower side and bringing the shaft
portion 189 on the lower side into contact with the outer side face
of the lower side plate 176. Further, movement of the contact
member 159 to a lower side in the axis center A direction is
restricted by bringing a lower face 187a of the circular
cylindrical portion 187 into contact with an upper face 176a of the
lower side plate 176 of the supporting member 158.
[0157] Further, under the state, the contact member 159 is
rotatable centering on the center axis of the circular cylindrical
portion 187 and at the same time, can freely be moved reciprocally
along the penetrated groove 181 between an escape position T
disposed at an initial end portion of the penetrated groove 181 in
the arrow mark D1 direction of FIG. 10 and an operating position S
disposed at a terminal end portion thereof.
[0158] Further, an attaching groove 181b directed to an outer side
in the diameter direction of the upper side plate 175 is formed at
the terminal end portion of the penetrated groove 181 of the
supporting member 158 in the arrow mark D1 direction of FIG. 10.
The attaching groove 181b is a groove provided for facilitating to
integrate the contact member 159 to the supporting member 158. In
details, the contact member 159 can easily be integrated to the
supporting member 158 by inserting the shaft portion 188 of the
contact member 159 to the attaching groove 181b.
[0159] The retaining piece 160 is formed in a shape of a circular
disk a center of which is disposed on the axis center A and which
is orthogonal to the axis center A and an outer diameter thereof
becomes smaller than that of the lower side plate 176 of the
supporting member 158. Further, the retaining piece 160 is formed
with a center hole 191 having a shape coinciding with that of the
large diameter portion 164 of the rotating member 156 at a center
thereof. Therefore, the center hole 191 is formed with a linear
portion 191a coinciding with the second fitting face 167 of the
large diameter portion 164. Further, the retaining piece 160 is
provided with a lower side circular through hole 92 and a lower
side rectangular through hole 193 at a peripheral edge portion
thereof. The lower side circular through hole 92 is provided with a
size and a shape the same as those of the upper side circular
through hole 168. The lower side rectangular through hole 193 is
provided with a size and a shape the same as those of the upper
side rectangular through hole 169 of the rotating member 156.
[0160] Further, the pressing device 137 having the rotating member
156, the torsional spring 157, the supporting member 158, the
contact member 159 and the retaining piece 160 as described above
is integrated by firstly outwardly fitting the torsional spring 157
to the center shaft 161 of the rotating member 156 from the lower
side. Further, the arm 173a of the torsional spring 157 is engaged
with the stepped difference portion 172 (refer to FIG. 11 and FIG.
12) of the rotating member 156.
[0161] Next, the center shaft 161 of the rotating member 156 is
inserted to penetrate into the through ole 158a provided at the
center of the supporting member 158 from the upper side. Further,
the supporting member 158 is previously attached with the contact
member 159. Further, the projected portion 170 (refer to FIG. 11)
of the rotating member 156 is disposed in the upper side plate side
opening portion 75a and the connecting portion side opening portion
177a of the supporting member 158. Further, the arm 173a of the
torsional spring 157 is engaged with the stepped difference portion
185 of the supporting member 158 (refer to FIG. 12). Thereafter,
the first upper side projected portion 78 and the second upper side
projected portion 179 of the supporting member 158 are respectively
fitted to the upper side circular through hole 168 and the upper
side rectangular through hole 169 of the rotating member 156.
[0162] Successively, the center shaft 161 inserted to penetrate the
supporting member 158 is inserted to penetrate the center hole 191
of the retaining piece 160. Further, at this occasion, the second
fitting face 167 of the center shaft 161 and the linear portion
191a of the center hole 191 are engaged with each other and
therefore, the retaining piece 160 is attached unrotatably to the
rotating member 156. Further, the lower side projected portions of
the supporting member 158 are respectively fitted to the lower side
circular through hole 92 and the lower side rectangular through
hole 193 of the retaining piece 160.
[0163] The pressing device 137 is integrated as described above and
as shown in FIG. 12, according to the pressing device 137, an angle
made by the arms 173a and 173b of the torsional spring 157 is more
or less reduced to generate a recovering force against torsion at
the torsional spring 157. As a result, in a state in which a force
is not applied from outside to the pressing device 137, the
rotating member 156 and the supporting member 158 are urged by the
torsional spring 157 such that the projected portion 1.70 of the
rotating member 156 and the locking projected portion 183 of the
supporting member 158 are separated from each other.
[0164] Therefore, as shown in FIG. 13, the supporting member 158 is
applied with a force of being pivoted in an arrow mark direction
shown in FIG. 13 centering on the first upper side projected
portion 78 fitted to the upper side circular through hole 168 and
the lower side projected portion. As a result, in a state in which
no force is applied from outside, the second upper side projected
portion 179 and the lower side projected portion of the supporting
member 158 are respectively disposed at right corners shown in FIG.
13 of the upper side rectangular through hole 169 and the lower
side rectangular through hole 193 (refer to FIG. 10).
[0165] Further, when a force of reducing the angle made by the arms
173a and 173b is applied to the pressing device 137 against the
recovery force against torsion of the torsional spring 157 as shown
in FIG. 14, the supporting member 158 is pivoted in an arrow mark
direction shown in FIG. 15 centering on the first upper side
projected portion 78 and the lower side projected portion as shown
in FIG. 15. Further, the second upper side projected portion 179
and the lower side projected portion of the supporting member 158
are respectively disposed at left corners shown in FIG. 15 of the
upper side rectangular through hole 169 and the lower side
rectangular through hole 193 (refer to FIG. 10). Further, as shown
in FIG. 14, the distance between the projected portion 170 of the
rotating member 156 and the locking projected portion 183 of the
supporting member 158 is reduced.
[0166] Therefore, in the case in which the contact member 159
attached to the supporting member 158 is disposed at the operating
position S (refer to FIG. 10) of the penetrated groove 181, when no
force is applied from outside to the contact member 159, as shown
in FIG. 12, the contact member 159 is disposed at a position most
remote from the axis center A, that is, a first position. Further,
when some force is applied from outside to the supporting member
158 as shown in FIG. 14, the contact member 159 is disposed at a
position more proximate to the axis center A than the first
position, that is, a second position, since the second upper side
projected portion 179 and the lower side projected portion of the
supporting member 158 are respectively moved to at left corners of
the upper side rectangular through hole 169 and the lower side
rectangular through hole 193. Further, when the force applied to
the supporting member 158 is changed, in accordance with the
magnitude of the force, the contact member 159 is disposed at any
position between the first position and the second position while
being disposed at the operating position S of the penetrated groove
181.
[0167] Further, as shown in FIG. 16, the pressing device 137
constituted as described above is fitted to the casing 135 attached
with the discharging tube 136 such that the center shaft 161 of the
pressing device 137 is inserted to penetrate the support hole 139
(refer to FIG. 8) of the casing 135. Further, at this occasion, the
contact member 159 of the pressing device 137 is brought into
contact with the flow path middle portion 149 of the discharging
tube 136 from the inner side. Further, the tube pump 128 is
finished as described above.
[0168] Next, an explanation will be given of operation of the
printer 111 constituted as described above.
[0169] First, an explanation will be given of a case of cleaning
the recording head 120 at the printer 111. In such a case, the
carriage 115 is moved to the home position and the recording head
120 is covered by the cap 129. Further, as shown in FIG. 16,
according to the tube pump 128, the rotating member 156 of the
pressing device 137 is rotated in an arrow mark D2 direction
(regularly rotating direction) shown in FIG. 16.
[0170] Then, the contact portion 59 supported by the supporting
member 158 is applied with a force in a direction reverse to the
regularly rotating direction by a friction force generated between
the contact member 159 and the flow path middle portion 149 of the
discharging tube 136. As a result, the contact member 159 is moved
along the penetrated groove 181 of the supporting member 158 to
dispose at the operating position S. Further, the contact member
159 presses the flow path middle portion 149 of the discharging
tube 136 while being disposed at the operating position S and is
rotated in the regularly rotating direction.
[0171] As a result, by depressing to flatten the discharging tube
136 and bringing about a change in the volume at inside of the
discharge tube 36, a pressure at the upstream side portion 136a of
the discharging tube 136 becomes lower than a pressure at the
downstream side portion 136b. Further, a pressure at inside of the
cap 129 connected to the upstream side portion 136a of the
discharging tube 136 is reduced and ink or air bubbles are sucked
from the nozzle opening of the recording head 120.
[0172] Further, at this occasion, the supporting member 158 for
supporting the contact member 159 is applied with a reaction force
which the contact member 159 receives from the flow path middle
portion 149. Further, the larger the applied force, the more the
supporting member 158 is moved from the first position (refer to
FIG. 12) to the second position (refer to FIG. 14). Particularly,
as shown in FIG. 17, since the bundled portion 152 at which the
discharging tube 136 is bundled is disposed at a position remote
from the center shaft 161, the magnitude of the reaction force
applied to the contact member 159 becomes smaller than that at
other portion. Therefore, the position of the supporting member 158
becomes proximate to the first position. As a result, also at the
bundled portion 152, the discharging tube 136 is depressed to
flatten by the contact member 159 by a pertinent pressing force.
Further, at the bundled portion 152, the upstream side end portion
150 and the downstream side end portion 151 of the flow path middle
portion 149 are simultaneously depressed to flatten by the contact
member 159.
[0173] Therefore, the position of the supporting member 158 is
changed from the first position to the second position in
accordance with the magnitude of the force received from the
discharging tube 136 and therefore, when rotated in the regularly
rotating direction, a state of depressing to flatten some portion
of the discharging tube 136 can always be brought about even when
the contact member 159 is disposed at any position in the rotating
direction. Further, the upstream side portion 136a of the
discharging tube 136 is prevented from being opened to the
downstream side portion 136b. As a result, by continuously rotating
the rotating member 156 in the regularly rotating direction,
pressure can be accumulated gradually from first rotation to second
rotation, from second rotation to third rotation.
[0174] Further, when the cleaning has been finished, as shown in
FIG. 18, according to the tube pump 128, the rotating member 156 of
the pressing device 137 is rotated by a predetermined number of
times in an arrow mark D3 direction (reversely rotating direction)
shown in FIG. 18 by diving unit. Then, the contact member 159
supported by the supporting member 158 is applied with a force in a
direction reverse to the reversely rotating direction by the
friction force generated between the contact member 159 and the
flow path middle portion 149 of the discharging tube 136. As a
result, the contact member 159 is moved along the penetrated groove
181 of the supporting member 158 to dispose at the escape position
T. Further, at the escape position T, the contact member 159 is
lightly brought into contact with the flow path middle portion 149
of the discharging tube 136.
[0175] As a result, the flow path middle portion 149 of the
discharging tube 136 is not depressed to flatten and a pressure
difference is not brought about in the discharging tube 136.
Further, in printing or pause for a long period of time of the
printer 111, the printer is left for a long period of time under
the state and deformation, a deterioration of durability or the
like of the discharging tube 136 is prevented.
[0176] According to the embodiments, the following effects can be
achieved.
[0177] (1) According to the embodiment, the flow path middle
portion 149 of the discharging tube 136 is arranged at inside of
the casing 135 to draw character .OMEGA.. Therefore, the
discharging tube 136 is not provided with an overlapped portion of
the tube formed, for example, when the tube is intersected in an
.alpha.-like shape. As a result, an extra space in the axis center
A direction produced by the overlapped portion needs not to ensure
and the tube pump 128 can be downsized.
[0178] (2) According to the embodiment, when the rotating member
156 is regularly rotated, the contact member 159 supported by the
supporting member 38 is pressed to the discharging tube 136 by an
elastic force by the torsional spring 157 engaged with the
supporting member 158. Therefore, the discharging tube 136 is
flexibly pressed by the contact member 159. As a result, when
regularly rotated, the flow path middle portion 149 including also
the bundled portion 152 are uniformly depressed to flatten.
Further, at the bundled portion 152, the upstream side end portion
150 and the downstream side end portion 151 can simultaneously be
depressed to flatten and even when the flow path middle portion 149
of the discharging tube 136 has the .OMEGA.-like shape and is not
provided with the overlapped portion, some portion of the
discharging tube 136 can always be depressed to flatten by the
single contact member. Therefore, pressure can be accumulated
continuously at inside of the discharging tube 136 by a simple
constitution. Further, pressure can be accumulated in a shorter
period of time than in the case of accumulating pressure
discontinuously.
[0179] (3) According to the embodiment, the casing 135 is formed in
the cylindrical shape and the urging unit has three members of the
rotating member 156, the torsional spring 157 and the supporting
member 158. Therefore, the constitution of the urging unit can be
simplified.
[0180] (4) According to the embodiment, the supporting member 158
is provided with the penetrated groove 181 and the contact member
159 is made movable to the operating position S for pressing the
discharging tube 136 by the contact member 159 and the escape
position T of being brought lightly into contact with the
discharging tube 136 in accordance with a rotational direction of
the rotating member 156. Therefore, the supporting member 158 can
serve as a member constituting the urging member and a member for
making the contact member 159 movable to the operating position S
and the escape position T and the structure of the tube pump 128
can be simplified.
[0181] (5) According to the embodiment, the discharging tube 136
has two flexible tubes 146 and 147. Therefore, a sucking function
of the tube pump 128 can be increased more than that in the case of
a single piece of the flexible tube. Further, even when the
discharging tube 136 has two flexible tubes 146 and 147, since the
flexible tubes 146 and 147 are not provided with an overlapped
portion in the axis center A direction, only a space in the axis
center A direction of two pieces of the flexible tubes may be
provided and therefore, the tube pump 128 can be downsized.
[0182] (6) According to the embodiment, the flexible tubes 146 and
147 are connected by the connecting portion 148 to constitute one
aggregation and therefore, the flexible tubes 146 and 147 are easy
to deal with and operation of integrating the discharging tube 136
to the tube pump 128 is facilitated.
[0183] (7) According to the embodiment, only one of the contact
member 159 is provided. Therefore, the structure of the tube pump
128 can be simplified. Further, the upstream side end portion 150
and the downstream side end portion 151 can simultaneously be
depressed to flatten by only a single one of the contact member 159
and even when the flow path middle portion 149 of the discharging
tube 136 is not provided with the overlapped portion, some portion
of the discharging tube 136 can always be depressed to flatten by
the single contact member 159. As a result, pressure can
continuously be accumulated at inside of the discharging tube
136.
[0184] Further, the above embodiment may be modified as
follows.
[0185] Although according to the embodiment, the torsional spring
157 is used as elastic member, the other elasticity member, for
example, rubber, tension spring, leaf spring or the like may be
used.
[0186] Although according to the embodiment, the discharging tube
136 has two flexible tubes 146 and 147, the discharging tube 136
may be constituted only by a single piece of the flexible tube.
Further, the discharging tube 136 may be constituted by three
pieces or more of the flexible tubes.
[0187] Although according to the embodiment, the flexible tubes 146
and 147 constituting the discharging tube 136 are connected by the
connecting portion 148, the flexible tubes 146 and 147 may not be
connected to each other.
[0188] Although according to the embodiment, the tube pump 128 is
provided with only a single one of the contact member 159, the tube
pump 128 may be provided with two pieces or more thereof.
[0189] Although according to the embodiment, an explanation has
been given such that the tube pump 128 is an apparatus used for
cleaning the printer 111, the tube pump 128 may be used for use
other than the printer 111.
[0190] Although according to the first and the second embodiments,
an explanation has been given of the printer for delivering ink
(printing apparatus including facsimile, copier or the like) as a
liquid ejecting apparatus, the embodiment may be a liquid ejecting
apparatus for ejecting other liquid. For example, the embodiment
may be a liquid ejecting apparatus for ejecting a liquid of an
electrode member, a colorant or the like used for fabricating
liquid crystal display, EL display, FED (face electroluminescence
display) or the like, a liquid ejecting apparatus for ejecting a
biological organic substance used for fabricating a biochip, or a
sample ejecting apparatus as a precision pipet.
[0191] Although an explanation has been given of the invention by
using the embodiments as described above, the technical range of
the invention is not limited to the range described in the
embodiments. The embodiments can variously be modified or improved.
It is apparent from the description of the scope of claims that the
modified or improved mode in this way can also be included in the
technical range of the invention.
* * * * *