U.S. patent application number 12/707218 was filed with the patent office on 2010-09-09 for image recording apparatus.
This patent application is currently assigned to BROTHER KOGYO KABUSHIKI KAISHA. Invention is credited to Mutsumi OTOBE.
Application Number | 20100225043 12/707218 |
Document ID | / |
Family ID | 42677518 |
Filed Date | 2010-09-09 |
United States Patent
Application |
20100225043 |
Kind Code |
A1 |
OTOBE; Mutsumi |
September 9, 2010 |
IMAGE RECORDING APPARATUS
Abstract
Disclosed is a recording apparatus including a recording portion
which records an image on a recording medium, a feeding mechanism
which feeds the medium along a feed path extending from a
recording-medium supply position to a recording-medium ejection
position via a recording point where the recording portion performs
the recording of the image, a reading portion which reads the image
recorded on the medium fed along the feed path, and a position
controller which controls a position of at least one of the medium
and the reading portion such that the medium as located at a
reading point for the reading portion in the feed path is
selectively placed in one of a first position allowing the reading
portion to read the image recorded on the recording medium and a
second position at which the recording medium is away from the
reading portion farther than when at the first position.
Inventors: |
OTOBE; Mutsumi; (Nagoya-shi,
JP) |
Correspondence
Address: |
Scully, Scott, Murphy & Presser, P.C.
400 Garden City Plaza, Suite 300
Garden City
NY
11530
US
|
Assignee: |
BROTHER KOGYO KABUSHIKI
KAISHA
Aichi-ken
JP
|
Family ID: |
42677518 |
Appl. No.: |
12/707218 |
Filed: |
February 17, 2010 |
Current U.S.
Class: |
271/3.14 |
Current CPC
Class: |
B41J 13/0036
20130101 |
Class at
Publication: |
271/3.14 |
International
Class: |
B65H 5/00 20060101
B65H005/00; B65H 9/00 20060101 B65H009/00 |
Foreign Application Data
Date |
Code |
Application Number |
Mar 6, 2009 |
JP |
2009-053319 |
Claims
1. An image recording apparatus comprising: a recording portion
which records an image on a recording medium; a feeding mechanism
which feeds the recording medium along a feed path extending from a
recording-medium supply position to a recording-medium ejection
position via a recording point where the recording portion performs
the recording of the image; a reading portion which reads the image
recorded on the recording medium fed along the feed path by the
feeding mechanism; and a position controller which controls a
position of at least one of the recording medium and the reading
portion such that the recording medium as located at a reading
point for the reading portion in the feed path is selectively
placed in one of a first position allowing the reading portion to
read the image recorded on the recording medium and a second
position at which the recording medium is away from the reading
portion farther than when at the first position.
2. The apparatus according to claim 1, wherein the position
controller controls the recording medium at the reading point to be
bent toward the reading portion such that the recording medium is
placed in the first position.
3. The apparatus according to claim 1, wherein the feeding
mechanism includes a plurality of feeding members that operate to
feed the recording medium and are disposed along the feed path with
a spacing therebetween and on an upstream side and a downstream
side of the reading point with respect to a direction of the feed
path, and wherein the position controller bends the recording
medium toward the reading portion between the feeding members, by
adjusting operations of the feeding members.
4. The apparatus according to claim 3, wherein the position
controller adjusts amounts of feeding of the recording medium by
the respective feeding members by adjusting the operations of the
feeding members.
5. The apparatus according to claim 4, wherein the position
controller adjusts the amounts of feeding of the recording medium
by the feeding members such that the amount of feeding by at least
one of the plurality of feeding members that is located on the
downstream side of the reading point with respect to the direction
of the feed path is made lower than that by the rest of the
plurality of feeding members that is located on the upstream side
of the reading point.
6. The apparatus according to claim 3, further comprising a guide
which limits a displacement of the recording medium away from the
reading portion at the portion of the feed path between the feeding
members.
7. The apparatus according to claim 3, wherein the feeding members
include a first feeding member and a second feeding member disposed
on the upstream side and the downstream side of the reading point,
respectively, with respect to the direction of the feed path, the
second feeding member being disposed above the first feeding member
and horizontally closer to the reading portion than the first
feeding member.
8. The apparatus according to claim 1, wherein the reading portion
is disposed on the downstream side of the recording portion with
respect to the direction of the feed path.
9. The apparatus according to claim 8, further comprising: a
test-recording control portion which controls the recording portion
to implement a test recording operation on the recording medium
based on test recording data; a test-image reading control portion
which controls the reading portion to read the image which is
formed on the recording medium under the control by the
test-recording control portion; and a recording-portion adjusting
portion which adjusts the recording portion based on the image read
by the reading portion under the control by the test-image reading
control portion.
10. The apparatus according to claim 1, wherein the first position
is where the recording medium contacts the reading portion.
11. The apparatus according to claim 1, wherein a first medium
accommodating portion disposed at the recording-medium supply
position and a second medium accommodating portion disposed at the
recording-medium ejection position that are used in the recording
by the recording portion are also used in the reading by the
reading portion.
12. The apparatus according to claim 1, wherein when the reading of
the image from the recording medium by the reading portion is
implemented, the position controller places the recording medium as
located at the reading point in the first position.
13. The apparatus according to claim 1, wherein when the recording
of the image on the recording medium by the recording portion is
implemented and the reading by the image from the recording medium
by the reading portion is not implemented, the position controller
places the recording medium as located at the reading point in the
second position.
14. The apparatus according to claim 1, wherein the position
controller displaces the position of the reading portion toward and
away from the recording medium to place the recording medium at the
reading point in the first position and the second position,
respectively.
15. The apparatus according to claim 1, wherein the position
controller displaces the position of the recording medium toward
and away from the reading portion to place the recording medium at
the reading point in the first position and the second position,
respectively.
Description
CROSS REFERENCE TO RELATED APPLICATION
[0001] The present application claims priority from Japanese Patent
Application No. 2009-53319, which was filed on Mar. 6, 2009, the
disclosure of which is herein incorporated by reference in its
entirety.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The present invention relates to an image recording
apparatus that records an image on a recording medium, and
particularly to an image recording apparatus including a reading
portion that reads an image recorded on a recording medium.
[0004] 2. Description of Related Art
[0005] There is known an image recording apparatus including a
recording portion and a reading portion, and accordingly having
both a function to record an image on a recording medium and a
function to read an image recorded on a recording medium. Such an
image recording apparatus can be made relatively small in size by
arranging the recording portion and the reading portion along a
same feed path of recording medium, for instance as compared to an
arrangement where a feed path of recording medium to the recording
portion is formed separately and independently of a feed path of
recording medium to the reading portion.
SUMMARY OF THE INVENTION
[0006] However, in a case where the focal length of the reading
portion disposed along the same feed path as the recording portion
is relatively small, a recording medium may contact with the
reading portion while being fed along the feed path. Hence, the
image recording apparatus has a disadvantage such that contact of a
recording medium with the reading portion leads to damage to or
deterioration of the reading portion. Further, where the reading
portion is of contact type such as CIS (Contact Image Sensor),
reading of an image from a recording medium is performed with the
recording medium contacted with the reading portion. In the image
recording apparatus using a reading portion of contact type, even
when only recording is performed on a recording medium, that is,
even when reading therefrom is not performed, the recording medium
is contacted with the reading portion. This makes the problem of
damage to or deterioration of the reading portion more serious in
the case of a contact-type reading portion.
[0007] This invention has been developed in view of the
above-described situations, and it is an object of the invention,
therefore, to provide an image recording apparatus with both a
function to record an image and a function to read an image, which
is relatively small in size and capable of preventing damage to or
deterioration of the reading portion.
[0008] To attain the above object, the invention provides an image
recording apparatus including a recording portion, a feeding
mechanism, a reading portion, and a position controller. The
recording portion records an image on a recording medium. The
feeding mechanism feeds the recording medium along a feed path
extending from a recording-medium supply position to a
recording-medium ejection position via a recording point where the
recording portion performs the recording of the image. The reading
portion reads the image recorded on the recording medium fed along
the feed path by the feeding mechanism. The position controller
controls a position of at least one of the recording medium and the
reading portion such that the recording medium as located at a
reading point for the reading portion in the feed path is
selectively placed in one of a first position allowing the reading
portion to read the image recorded on the recording medium and a
second position at which the recording medium is away from the
reading portion farther than when at the first position.
BRIEF DESCRIPTION OF THE DRAWINGS
[0009] The above and other objects, features, advantages and
technical and industrial significance of the present invention will
be better understood by reading the following detailed description
of preferred embodiments of the invention, when considered in
connection with the accompanying drawings, in which:
[0010] FIG. 1 is a side cross-sectional view of an inkjet printer
according to a first embodiment of the invention;
[0011] FIG. 2 is a flowchart illustrating a control routine
executed in the printer;
[0012] FIGS. 3A and 3B are enlarged views of a part of FIG. 1
encircled by dashed line, in which FIG. 3A shows a state where the
printer is in a normal recording mode and FIG. 3B shows a state
where the printer is in a recording-quality check mode;
[0013] FIG. 4 is a flowchart illustrating a control routine
executed in an inkjet printer according to a second embodiment of
the invention;
[0014] FIGS. 5A and 5B are enlarged views of a part of the printer
of the second embodiment corresponding to the part encircled by
dashed line in FIG. 1, in which FIG. 5A shows a state where the
printer is in a normal recording mode and FIG. 5B shows a state
where the printer is in a recording-quality check mode;
[0015] FIG. 6 is a flowchart illustrating a control routine
executed in an inkjet printer according to a third embodiment of
the invention; and
[0016] FIGS. 7A and 7B are enlarged views of a part of the printer
of the third embodiment corresponding to the part encircled by
dashed line in FIG. 1, in which FIG. 7A shows a state where the
printer is in a normal recording mode and FIG. 7B shows a state
where the printer is in a recording-quality check mode.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
[0017] Hereinafter, there will be described presently preferred
embodiments of the invention, by referring to the accompanying
drawings.
[0018] Referring first to FIG. 1 to FIG. 3B, there will be
described an image recording apparatus according to a first
embodiment of the invention, in the form of an inkjet printer. FIG.
1 shows a general structure of the inkjet printer, which is
generally denoted by reference numeral 1.
[0019] As shown in FIG. 1, the inkjet printer 1 has a housing 1a
having the shape of a rectangular parallelepiped. An internal space
of the housing 1a is vertically divided into three sub spaces
denoted by reference signs A, B and C from top to bottom. In the
sub space A are disposed four inkjet recording heads 10, a
controller 100, a CIS (Contact Image Sensor) 50, and others. The
four inkjet recording heads 10, which correspond to a recording
portion, eject droplets of magenta, cyan, yellow and black inks,
respectively. The controller 100 controls operation of various
portions of the printer 1. The CIS 50, which corresponds to a
reading portion, reads an image recorded on a recording sheet P as
a recording medium. In the sub spaces B and C are respectively
disposed a sheet supply unit 1b and an ink tank unit 1c, both of
which are detachably inserted in the housing 1a along a main
scanning direction. The housing 1a has a top plate whose upper side
corresponds to a sheet ejection position where a sheet ejection
portion 131 is disposed. A recording sheet P is rejected out of the
internal space of the housing 1a onto the sheet ejection portion
131 through an opening 130. The sheet ejection position and the
sheet ejection portion 131 respectively correspond to a
recording-medium ejection position and a second medium
accommodating portion.
[0020] The ink tank unit 1c includes four main tanks 121
respectively storing the inks of the four different colors
corresponding to the four recording heads 10. The main tanks 121
are connected with the respectively corresponding recording heads
10 via tubes (not shown) or others. The sheet supply unit 1b has a
sheet supply tray 123 corresponding to a first medium accommodating
portion and a pickup roller 125. The sheet supply tray 123 is
capable of storing a plurality of recording sheets P, and the
pickup roller 125 is attached to the sheet supply tray 123.
Recording sheets P placed in the sheet supply tray 123 are one by
one supplied or fed out of the sheet supply tray 123 by the pickup
roller 125, from a topmost one. Each recording sheet P fed out of
the sheet supply tray 123 is fed to a belt feeding mechanism 122 by
being nipped between a feeding roller pair 126 while guided by
guides 127a, 127b.
[0021] The belt feeding mechanism 122 includes two belt rollers 6,
7, an endless feeder belt 8, a tensioner roller 9, and a support
frame 11. The feeder belt 8 is wound around the belt rollers 6, 7.
The tensioner roller 9 is biased downward and held in contact with
an inner circumferential surface of a lower part of the feeder belt
8 so as to apply a tension to the feeder belt 8. The support frame
11 supports the belt rollers 6, 7 and the tensioner roller 9 such
that the rollers 6, 7, 9 are rotatable. When the controller 100
controls the belt roller 7 serving as a drive roller to rotate
clockwise as seen in FIG. 1, the feeder belt 8 travels or
circulates, which in turn rotates the belt roller 6 as a driven
roller clockwise as seen in FIG. 1.
[0022] An upper part of the feeder belt 8 is supported by a platen
19 such that an outer circumferential surface of the feeder belt 8
extends parallel to lower surfaces of the four recording heads 10
with a gap therebetween. In the lower surface of each of the
recording heads 10 are arranged a large number of ejection openings
through which the ink is ejected in the form of minute droplets.
The four recording heads 10 each long in the main scanning
direction are arranged in an auxiliary scanning direction and
supported on the housing 1a via a frame 2.
[0023] The outer circumferential surface of the feeder belt 8 is
coated with a silicone layer exhibiting a low adhesion such that a
recording sheet P fed to the belt feeding mechanism 122 and pressed
against the outer circumferential surface of the feeder belt 8 by a
pressing roller 4 is then fed in the auxiliary scanning direction
as indicated by bold black arrows in FIG. 1 while held on the outer
circumferential surface of the feeder belt 8 by the adhesion
thereof.
[0024] When a recording sheet P thus held on the feeder belt 8
passes immediately under the four recording heads 10, that is, a
recording point where the recording sheet P is opposed to the
ejection openings arranged in the lower surfaces of the recording
heads 10, droplets of the inks of different colors are sequentially
ejected from the ejection openings of the recording heads 10 onto
the recording sheet P so as to form a color image on the recording
sheet P. Thereafter, the recording sheet P is separated from the
surface of the feeder belt 8 by a separation plate 5, and fed
upward by being nipped between an upstream roller pair 71 and then
between a downstream roller pair 72 while guided by a guide pair 61
and a guide 62, to be ejected onto the sheet ejection portion 131
through the opening 130 formed in an upper portion of the housing
1a. The roller pairs 71, 72 respectively correspond to a first
feeding member and a second feeding member.
[0025] In the printer 1, a recording sheet P is fed by a feeding
unit, which corresponds to a feeding mechanism, along a feed path.
The feeding unit includes the pickup roller 125, the feeding roller
pair 126, the belt feeding mechanism 122, and the upstream and
downstream roller pairs 71, 72. The feed path extends from the
sheet supply tray 123 disposed in the sub space B as a
recording-medium supply position to the sheet ejection portion 131
through the recording point under the recording heads 10.
[0026] Among the guides 127a, 127b, 61, 62 disposed to guide the
recording sheet P fed along the feed path, the guides 127a, 127b,
61 are constituted each by a pair of plates that are disposed to be
opposed to the recording sheet P from two opposite sides such that
one of the plates is opposed to a first surface of the recording
sheet P on which an image is recorded by the recording heads 10 and
the other plate is opposed to a second surface of the recording
sheet P opposite to the first surface. The guide 62 is constituted
by a single plate disposed to be opposed to the second surface of
the recording sheet P. The size of each of the plates constituting
the guides 127a, 127b, 61, 62 is determined in order that the
guides 127a, 127b, 61, 62 can guide a recording sheet P of a
maximum width that the printer 1 is meant to handle.
[0027] The guide 62 extends upward from a position near the roller
pair 71 such that a lower portion thereof extends vertically and an
upper portion thereof curves toward the opening 130. The CIS 50 is
disposed on an inner side of the curve of the upper portion of the
guide 62, and opposed to a guide surface (i.e., a left-side surface
as seen in FIG. 1) of the guide 62 with a spacing therebetween.
[0028] As shown in FIG. 1, the guide 62 extends straight and
vertically upward from the downstream side of the upstream roller
pair 71, and then curves to the side of the CIS 50 and toward the
upstream side of the downstream roller pair 72. The recording sheet
P is fed by the upstream roller pair 71 along the guide 62
vertically upward and then along the curve of the guide 62 to the
downstream roller pair 72. Thus, a portion of the feed path of the
recording sheet P between the roller pairs 71, 72 is defined solely
by the guide 62. Therefore, the guide 62 is constituted by a single
plate that limits a displacement of the recording sheet P fed
between the roller pairs 71, 72 in a direction away from the CIS
50, and allows a displacement of the recording sheet P fed between
the roller pairs 71, 72 in a direction toward the CIS 50.
[0029] The CIS 50 is a reading unit of contact type, and has a
reading surface 50a provided by a glass material. To read an image
on a surface of a recording sheet P, the surface of the recording
sheet P is contacted with the reading surface 50a. The CIS 50 is
fixed in position inside the printer 1 in an inclined orientation
such that the reading surface 50a faces the curve, or the upper
portion, of the guide 62, that is, the reading surface 50a
constitutes a right side of the reading unit 50 and faces obliquely
upward, as seen in FIG. 1.
[0030] The roller pair 72 is disposed between an upper end of the
guide 62 and the opening 130. More specifically, the position where
the roller pair 72 is disposed is above the roller pair 71, which
is disposed near a lower end of the guide 62, and horizontally
closer to the CIS 50 than the roller pair 71. Each of the rollers
of the roller pairs 71, 72 has a rotation axis perpendicular to a
surface of the sheet on which FIG. 1 is presented, like the pickup
roller 125 and the feeding roller pair 126. Further, like the
feeding roller pair 126, each of the roller pairs 71, 72 operates
to feed a recording sheet P by nipping the recording sheet P from
two opposite sides and rotates in contact with the recording sheet
P. Each of the roller pairs 71, 72, 126 is such that one of the two
rollers as a drive roller rotates under control of the controller
100, and the other roller as a driven roller in direct or indirect
contact with the drive roller (i.e., with or without a recording
sheet nipped between the roller pair) rotates with the rotation of
the drive roller.
[0031] Referring to FIGS. 2 and 3, there will be described a
control routine of the printer 1 executed by the controller
100.
[0032] The controller 100 can receive an instruction to perform a
normal recording operation (hereinafter referred to as "the normal
recording instruction") or an instruction to perform a test
recording operation (hereinafter referred to as "the test recording
instruction"). For instance, such instructions are received from a
personal computer connected with the printer 1 via an interface of
the printer 1.
[0033] When the controller 100 receives the normal recording
instruction, the controller 100 executes a normal recording control
routine according to which an image reading operation for reading
an image by the CIS 50 is not performed. That is, the controller
100 controls various portions of the printer 1 in a normal
recording mode, i.e., to feed a recording sheet P from the sheet
supply tray 123 to the recording point under the recording heads
10, drive the recording heads 10 so as to form an image on the
recording sheet P based on normal recording data included in the
normal recording instruction, and then feed the recording sheet P
with the image thereon from the recording point to the sheet
ejection portion 131.
[0034] In the normal recording mode, the controller 100 controls
the roller pairs 71, 72 to rotate at a same speed. After the
recording sheet P with the image having been recorded thereon is
fed to a position where a leading edge of the recording sheet P
reaches the upstream roller pair 71, the recording sheet P is fed
upward along the guide 62 by being nipped between the upstream
roller pair 71. Then, after reaching the downstream roller pair 72,
the recording sheet P is fed along the guide 62 in a direction as
indicated by bold arrows in FIG. 3A by being nipped between each of
the roller pars 71, 72 rotating at a same speed, to be ejected onto
the sheet ejection portion 131 from the side of its leading edge. A
two-dot chain line in FIG. 3A indicates this phase of the feed path
of recording sheet.
[0035] As shown in FIG. 3A, while the recording sheet P is fed by
being nipped between the roller pairs 71, 72, the rotation speeds
of the roller pairs 71, 72 are the same. Thus, the recording sheet
P substantially does not bend or warp toward the outer side of the
guide 62 (i.e., rightward as seen in FIG. 3A). Further, the
recording sheet P substantially does not bend or warp toward the
inner side and off the guide 62 (i.e., leftward as seen in FIG. 3A)
of the guide 62 at a portion of the feed path between the roller
pairs 71, 72, but conforms to the curve of the guide 62. Even while
the leading edge of the recording sheet P is located in the portion
of the feed path between the roller pairs 71, 72, the rigidity of
the recording sheet P prevents downward slacking or sagging thereof
and keeps its shape in side view conforming to the two-dot chain
line in FIG. 3A.
[0036] As shown in FIG. 3A, in the normal recording mode the CIS 50
is held separated from and does not contact the recording sheet P
fed along the two-dot chain line.
[0037] On the other hand, when the controller 100 receives the test
recording instruction, the controller 100 executes a control
routine illustrated in FIG. 2, which will be hereinafter referred
to as a recording-quality check processing routine.
[0038] The recording-quality check processing routine begins with
step S10 in which the controller 100 controls various portions of
the printer 1 to record test recording data included in the test
recording instruction. That is, the controller 100 controls in a
recording-quality check mode, i.e., controls to feed a recording
sheet P for the test recording operation from the sheet supply tray
123 to the recording point under the recording heads 10, drive the
recording heads 10 so as to form an image on the recording sheet P
based on the test recording data, and then feed the recording sheet
P with the image recorded thereon from the recording point through
between the guide pair 61 and along the guide 62 by nipping the
recording sheet P between the roller pair 71.
[0039] The test recording data is a kind of data different from the
normal recording data, and may be printable by ejecting ink
droplets from all the ejection openings of all the recording heads
10, for instance. The width and length of the image printed based
on the test recording data may be determined as desired.
[0040] The processing of step S10 may be implemented simultaneously
with that of step S11 and the following steps. That is, it may be
configured such that while step S11 and the following steps are
implemented, the test recording operation is implemented based on
the test recording data by operating the recording heads 10 and
others.
[0041] Then, step S11 is implemented in which the controller 100
determines whether a leading edge of the recording sheet P reaches
the downstream roller pair 72. This determination may be made on
the basis of a detection signal from a sheet sensor (not shown)
disposed in the vicinity of the roller pair 72, or a change in the
rotation load of the roller pair 72, for instance. When it is
determined that the leading edge of the recording sheet P does not
reach the downstream roller pair 72, a negative decision (NO) is
made in step S11 and the controller 100 repeats step S11. The
recording sheet P is fed along the same feed path as in the normal
recording mode which is shown in FIG. 3A, until its leading edge
reaches the downstream roller pair 72.
[0042] When it is determined that the leading edge of the recording
sheet P reaches the downstream roller pair 72, an affirmative
decision (YES) is made in step S11 and the routine goes to step
S12, in which the controller 100 controls rotations of the roller
pairs 71, 72 with the rotation speed of the downstream roller pair
72 set lower than that of the upstream roller pair 71. Thus, after
the leading edge of the recording sheet P reaches the roller pair
72, the recording sheet P gradually sags or bends vertically
downward at the portion of the feed path between the roller pairs
71, 72 by gravitation and a difference in rotation speed between
the roller pairs 71, 72, as the recording sheet P is fed by being
nipped between the roller pairs 71, 72.
[0043] The routine then goes to step S13 in which the controller
100 determines whether the surface of the recording sheet P is
contacted with the reading surface 50a of the CIS 50, as shown in
FIG. 3B. This determination may be made based on a signal from the
CIS 50, for instance. When it is determined that the surface of the
recording sheet P is not contacted with the reading surface 50a of
the CIS 50, a negative decision (NO) is made in step S13 and the
controller 100 repeats step S13.
[0044] When it is determined that the surface of the recording
sheet P is contacted with the reading surface 50a of the CIS 50, an
affirmative decision (YES) is made in step S13 and the routine goes
to step S14, in which the controller 100 controls the rotation
speeds of the roller pairs 71, 72 to become same. In the next step
S15, the controller 100 controls the CIS 50 to read the image
printed on the recording sheet P, i.e., a result of the test
recording operation.
[0045] That is, the recording sheet P is fed in a direction
indicated by bold arrows in FIG. 3B by being nipped between the
roller pairs 71, 72 rotating at a same speed, with the recording
sheet P bent downward at the portion of the feed path between the
roller pairs 71, 72 into contact with the reading surface 50a of
the CIS 50, as shown in FIG. 3B. While the recording sheet P is fed
in this way, the image reading operation is implemented, i.e., the
CIS 50 reads the image or the result of the test recording
operation on the recording sheet P and sends data corresponding to
a result of the image reading operation to the controller 100.
[0046] Thereafter, the routine goes to step S16 in which the
controller 100 determines whether it is necessary to adjust the
operation of the recording heads 10, based on the data
representative of the result of the test recording operation sent
from the CIS 50. For instance, in a case where blurring of a dot
formed with an ink droplet is recognized in the image formed as the
result of the test recording operation, the controller 100
determines that it is necessary to adjust the operation of the
recording heads 10 so as to reduce the size and/or amount of an ink
droplet ejected from one of the ejection openings corresponding to
the dot blurring, or of ink droplets ejected from all the ejection
openings. More specifically, in this case, it is necessary to
adjust operation of an actuator of the recording heads 10, for
instance. In another case where a defective dot or a blank dot due
to defective ejection or non-ejection of an ink droplet is
recognized in the image formed as the result of the test recording
operation, the controller 100 determines that it is necessary to
adjust the operation of the recording heads 10 by implementing a
maintenance operation such as flushing operation.
[0047] When the controller 100 determines that it is necessary to
adjust the operation of the recording heads 10, an affirmative
decision (YES) is made in step S16 and the routine goes to step
S17, in which the controller 100 adjusts the operation of the
recording heads 10. As described above by way of example, the
adjustment of the operation of the recording heads 10 may take the
form of adjustment of the operation of an actuator in the case
where the recording heads 10 employ a piezoelectric actuator, or
implementation of the maintenance operation. The adjustment of the
operation of the actuator may take the form of increasing or
decreasing the drive voltage.
[0048] When the controller 100 determines that it is not necessary
to adjust the operation of the recording heads 10, a negative
decision (NO) is made in step S16 and this cycle of the routine
terminates. On the other hand, when the controller 100 determines
that it is necessary to adjust the operation of the recording heads
10 in step S16, the routine goes to step S17 to adjust the
operation of the recording heads 10 and then this cycle of the
routine terminates. The recording sheet P on which the test
recording operation and the image reading operation have been
performed is ejected onto the sheet ejection portion 131.
[0049] As described above, according to the present embodiment, the
CIS 50 is disposed to be capable of reading an image recorded on a
recording sheet P fed along the feed path extending from the sheet
supply tray 123 to the sheet ejection portion 131 via the recording
point under the recording heads 10. In other words, a same single
path provides a feed path of recording sheet to the recording heads
10 and a feed path thereof to the CIS 50. This enables to make the
printer 1 relatively small in size, compared to an arrangement
where two separate feed paths are formed to serve as a feed path of
recording sheet to the recording heads 10 and a feed path thereof
to the CIS 50, respectively.
[0050] A position in the feed path where a recording sheet P is
opposed to the reading surface 50a of the CIS 50 to allow the CIS
50 to read an image on the recording sheet P is defined as a
reading point in the feed path. The controller 100 controls the
position of a recording sheet P as located at the reading point.
That is, at the reading point, a recording sheet P is selectively
placed in one of a "readable position" and a "retracted position".
When the recording sheet P is at the readable position, which is
one example of a first position, the CIS 50 can read the image on
the recording sheet P or the image is in focus on the CIS 50 to be
read thereby. When the recording sheet P is at the retracted
position, which is one example of a second position, the recording
sheet P is away from the CIS 50 farther than when at the readable
position. In this embodiment, the readable position is where the
recording sheet P contacts the reading surface 50a of the CIS 50,
as shown in FIG. 3B, and the retracted position is where the
recording sheet P is separated or spaced from the CIS 50, as shown
in FIG. 3A. In this way, the controller 100 controls the position
of a recording sheet P as located at the reading point in the feed
path such that when an image on the recording sheet P is to be
read, the recording sheet P is placed in the readable position, and
when an image is to be recorded on the recording sheet P, the
recording sheet P is placed in the retracted position to prevent
contact of the recording sheet P with the CIS 50, thereby
preventing damage to or deterioration of the CIS 50.
[0051] The controller 100 changes the position of the recording
sheet P toward the CIS 50 (i.e., to the position shown in FIG. 3B)
to place the recording sheet P in the readable position, and
changes the position of the recording sheet P away from the CIS 50
(i.e., to the position shown in FIG. 3A) to place the recording
sheet P in the retracted position.
[0052] In this embodiment, the case where the normal recording
operation and the recording-quality check processing routine are
executed is described. However, it is not essential to execute the
recording-quality check processing routine, and the embodiment may
be modified as follows. That is, when the controller 100 receives
the normal recording instruction, i.e., the instruction to perform
the normal recording operation without performing the image reading
operation for reading an image by the CIS 50, the controller 100
implements a control to have the roller pairs 71, 72 rotate at a
same speed, and place in the non-read position the recording sheet
P at the reading point in the feed path where the CIS 50 can read
an image. On the other hand, when the controller 100 receives an
image reading instruction, that is, an instruction to perform the
image reading operation for reading an image by the CIS 50 without
performing an image recording operation by the recording heads 10,
the controller 100 controls the roller pair 72 to rotate at a speed
lower than that of the roller pair 71, thereby placing in the
readable position the recording sheet P at the reading point in the
feed path. This inhibits the recording sheet P from contacting the
CIS 50 when the normal recording operation is performed, thereby
preventing the damage to or deterioration of the CIS 50.
[0053] Further, it is possible to continuously record an image on a
recording sheet and then read the image while the recording sheet P
is fed along the feed path extending from the sheet supply tray 123
to the sheet ejection portion 131.
[0054] The roller pairs 71, 72 of the feeding unit are arranged
with a spacing therebetween along the feed path extending from the
sheet supply tray 123 to the sheet ejection portion 131 via the
recording point under the recording heads 10, such that the roller
pairs 71, 72 are on the upstream and downstream sides of the
reading point, respectively, with respect to a direction of the
feed path. In order to switch the position of a recording sheet P
from non-read (shown in FIG. 3A) to read (shown in FIG. 3B), the
controller 100 adjusts the rotations of the roller pairs 71, 72 in
step S12 of FIG. 2 so as to bend or warp toward the CIS 50 the
recording sheet P at the portion of the feed path between the
roller pairs 71, 72. As in a second embodiment of the invention
described later, switching of the position of a recording sheet P
from non-read to read to allow reading of an image on the recording
sheet P may be achieved by an arrangement where the controller 100
controls or changes the position of the CIS 50, not the position of
the recording sheet P, but such an arrangement involves a mechanism
exclusively for displacing the CIS 50. Further, switching of the
position of a recording sheet P from non-read to read may also be
achieved by further another arrangement where a member (e.g., a
sheet pressing member 80 in a third embodiment of the invention
described later) exclusively for being pressed against a recording
sheet P and a mechanism for displacing the member are disposed in
the printer 1, and the position of the recording sheet P is
controlled or changed such that the controller 100 operates to
press the member against the recording sheet P with the CIS 50
fixed in position. In contrast to this arrangement involving the
member exclusively for being pressed against a recording sheet P
and the mechanism for displacing the member, this embodiment where
the controller 100 controls or changes the position of the
recording sheet P by utilizing the roller pairs 71, 72 of the
feeding unit involves neither the member nor the mechanism for
displacing the member. Thus, the complexity in structure and the
manufacturing cost of the printer 1 are reduced, while downsizing
of the printer 1 is facilitated.
[0055] The inkjet printer 1 has the guide 62 that is disposed on
the outer side (i.e., a side opposite to the CIS 50) of the portion
of the feed path of recording sheet between the roller pairs 71,
72. The recording sheet P is bent at the portion of the feed path
between the roller pairs 71, 72 by adjustment of the operations of
the roller pairs 71, 72 (that correspond to amounts of feeding of
the recording sheet P), but it is limited by the guide 62 that the
recording sheet P bends to the outer side of the feed path. Hence,
the recording sheet P can be reliably bent toward the CIS 50 at the
portion of the feed path between the roller pairs 71, 72.
[0056] With respect to the direction of the feed path the roller
pair 71 and the roller pair 72 are respectively disposed upstream
and downstream of the reading point where the CIS 50 can read an
image on a recording sheet P, i.e., where a recording sheet P is
opposed to the reading surface 50a of the CIS 50, and the roller
pair 72 is disposed above the roller pair 71 and horizontally
closer to the CIS 50 than the roller pair 71. This arrangement is
advantageous in that gravitation facilitates bending or warping
toward the CIS 50 a recording sheet P at the portion of the feed
path between the roller pairs 71, 72.
[0057] Since the CIS 50 is disposed downstream of the recording
heads 10 with respect to the direction of the feed path, it is
enabled to promptly read an image having just been recorded by the
recording heads 10 so as to check the quality of the image or the
performance of the recording heads 10, as described above with
reference to FIG. 2.
[0058] As described above with respect to steps S15-S17, the
controller 100 adjusts the operation of the recording heads 10 on
the basis of the result of the test recording operation. This
contributes to maintain an excellent recording quality.
[0059] Employing a reading unit of contact type such as the CIS 50
is advantageous over employing a reading unit of non-contact type
in the following: as compared to the case of the non-contact type
reading unit (i) the size of the printer 1 as a whole can be made
small since a contact-type reading unit is small in size, (ii) a
contact-type reading unit is available at low cost, (iii) a
contact-type reading unit requires no warm-up time, making the
start-up time of the printer 1 relatively short, (iv) the power
consumption is low, and others.
[0060] The sheet supply tray 123 in the sub space B and the sheet
ejection portion 131 on the upper side of the top plate of the
housing 1a serve as a recording-medium supply position and a sheet
ejection position, respectively, in both the case where the
recording heads 10 records an image and the case where the CIS 50
reads an image. That is, irrespective of whether an image is to be
recorded using the recording heads 10 or an image is to be read
using the CIS 50, a recording sheet P as a recording medium is
supplied from the sheet supply tray 123, and ejected onto the sheet
ejection portion 131. In contrast, for instance in an arrangement
where a pair of recording-medium accommodating portions are
provided to serve as the recording-medium supply position in the
recording and the reading of an image, respectively, or/and a pair
of recording-medium ejection portions are provided to serve as the
recording-medium ejection position in the recording and the reading
of an image, respectively, a work operation and/or a control
related to switching of the feed path is/are involved. This
embodiment does not involve such a work operation and a control and
thus can quickly or promptly implement an operation to record
and/or read an image.
[0061] It is noted that in the first embodiment a portion of the
controller 100 that operates to have the recording heads 10
implement the test recording operation based on the test recording
data corresponds to a test-recording control portion, a portion of
the controller 100 that operates to have the reading portion read
the image on the recording sheet P as the result of the test
recording operation corresponds to a test-image reading control
portion, and a portion of the controller 100 that operates to
adjust the operation of the recording heads 10 corresponds to a
recording-portion adjusting portion.
[0062] Referring next to FIGS. 4 and 5, there will be described an
inkjet printer according to a second embodiment of the invention.
In the following description and the drawings of the second
embodiment, members or parts and processings corresponding those in
the first embodiment are denoted by the same reference numerals or
symbols, and detailed description thereof is omitted.
[0063] As shown in FIGS. 5A and 5B, an inkjet printer according to
the second embodiment differs from that of the first embodiment in
that in place of the CIS 50, a CIS 250 which is not fixed in
position, is horizontally displaceable by operating a solenoid 90,
and has a reading surface 250a parallel to a vertical plane is
disposed in the printer, and the controller 100 does not
differentiate the rotation speeds of the roller pairs 71, 72 from
each other in the recording-quality check processing routine.
[0064] In the second embodiment, an end of a movable portion 90a of
the solenoid 90 is held in contact with a rear surface of the CIS
250 that is opposite to the reading surface 250a. When the
recording-quality check processing routine is not implemented, for
instance when the printer is in the normal recording mode, the CIS
250 is located at an original position off the feed path as shown
in FIG. 5A. When at the original position, the CIS 250 does not
contact, or is held off of, a recording sheet P fed along a two-dot
chain line in FIG. 5A. As described later, when the
recording-quality check processing routine is implemented, the CIS
250 is displaced rightward from the original position shown in FIG.
5A to an advanced position shown in FIG. 5B, by operating the
solenoid 90 to extend its movable portion 90a rightward as seen in
FIG. 5B. The advanced position is where the reading surface 250a of
the CIS 250 becomes parallel to a surface of a recording sheet P
being fed along the same feed path as in the normal recording
mode.
[0065] In the first embodiment, the position of the CIS 50 is
invariant between the normal recording mode and the
recording-quality check mode, but the feed path of recording sheet
is varied or differentiated between the two modes around the
reading point where a recording sheet P is opposed to the reading
surface 50a and the CIS 50 reads an image thereon. On the other
hand, according to the second embodiment, the feed path is not
differentiated around the reading point but the position of the CIS
250 is differentiated between the two modes.
[0066] That is, the controller 100 changes the position of the CIS
50 toward the recording sheet P (i.e., the advanced position shown
in FIG. 5B) to place the recording sheet P in the readable
position, and changes the position of the CIS 50 away from the
recording sheet P (i.e., the original position shown in FIG. 5A) to
place the recording sheet P in the retracted position.
[0067] In addition to the guide 62, the inkjet printer of the
second embodiment has a guide 63 opposed to the guide 62 via the
feed path. Like the guide 62, the guide 63 is constituted by a
plate. The guide 63 has an opening in its lengthwise central
portion. When at its advanced position, the CIS 250 is accommodated
in the opening in the guide 63.
[0068] In the second embodiment, the controller 100 executes a
recording-quality check processing routine illustrated in FIG. 4,
instead of that of FIG. 2, upon receiving the test recording
instruction.
[0069] The recording-quality check processing routine begins with
step S21 in which the controller 100 operates the solenoid 90 to
extend the movable portion 90a so as to displace the CIS 250 from
the original position shown in FIG. 5A to the advanced position
shown in FIG. 5B. Then, the routine goes to step S10 in which the
controller 100 implements the same processing of the test recording
operation as in the first embodiment, while the CIS 250 is held at
the advanced position. In the following step S13, the controller
100 determines whether the surface of the recording sheet P
contacts the reading surface 250a of the CIS 250.
[0070] When the controller 100 determines that the surface of the
recording sheet P contacts the reading surface 250a, an affirmative
decision (YES) is made in step S13 and the routine goes to step
S15, in which the controller 100 controls the CIS 250 to read the
image as a result of the test recording operation that is recorded
on the recording sheet P. In the following steps S16 and 17, the
controller 100 implements the same operation-adjustment processing
as in the first embodiment. Then, the routine goes to step S22 in
which the controller 100 operates the solenoid 90 to retract the
movable portion 90a so as to displace the CIS 250 from the advanced
position shown in FIG. 5B to the original position shown in FIG.
5A.
[0071] As described above, according to the second embodiment, the
controller 100 controls the position of the CIS 250 such that a
recording sheet P as located at the reading point in the feed path,
where the recording sheet P is opposed to the reading surface 250a
of the CIS 250 and the CIS 250 can read an image on the recording
sheet P, is selectively placed in one of a readable position shown
in FIG. 5B and a retracted position shown in FIG. 5A. In this
embodiment, the readable position to allow the CIS to read an image
on a recording sheet P is where the contact surface 250a of the CIS
250 contacts the recording sheet P, as shown in FIG. 5B, and the
retracted position where the recording sheet P is farther away from
the CIS than at the reading point is where the recording sheet P is
separated or spaced from the CIS 250, as shown in FIG. 5A. In this
way, the controller 100 controls to place a recording sheet P in
the readable position when an image on the recording sheet P is
read, and in the retracted position when an image is recorded on
the recording sheet P so as to prevent contact between the
recording sheet P and the CIS 250, thereby preventing damage to or
deterioration of the CIS 250, like in the first embodiment.
[0072] Further, the first and second embodiments have the following
arrangements in common: the CIS 50, 250 is disposed to be capable
of reading an image having been recorded on a recording sheet P
being fed along the feed path extending from the sheet supply tray
123 to the sheet ejection portion 131 via the recording point under
the recording heads 10; the CIS 50, 250 is disposed downstream of
the recording heads 10 with respect to the direction of the feed
path; the controller 100 adjusts the operation of the recording
heads 10 on the basis of the result of the test recording
operation; as a reading unit, the CIS 50, 250 which is of contact
type is employed; and the sheet supply tray 123 and the sheet
ejection portion 131 are used in both recording and reading of an
image. Therefore, the second embodiment can enjoy a part of the
effects of the first embodiment that derives from the arrangements
common with the first and second embodiments.
[0073] Referring to FIGS. 6 and 7, there will be described an
inkjet printer according to a third embodiment of the invention. In
the following description of the third embodiment, members or parts
and processings corresponding to those of the first embodiment will
be denoted by the same reference numerals or symbols and detailed
description thereof is omitted.
[0074] In the inkjet printer of the third embodiment, a CIS 350 is
disposed in the printer in place of the CIS 50. The CIS 350 is
fixed in position like the CIS 50 in the first embodiment, but the
CIS 350 differs from the CIS 50 in that a reading surface 350a of
the CIS 350 is parallel to a vertical plane. As shown in FIGS. 7A
and 7B, the printer of the third embodiment includes a sheet
pressing member 80 that is horizontally displaceable by operating a
solenoid 390.
[0075] The sheet pressing member 80 is a cylindrical member having
a rotation axis perpendicular to the sheet on which FIGS. 7A and 7B
are presented. The sheet pressing member 80 is disposed to be
opposed to the reading surface 350a of the CIS 350, and is
supported by a main body of the printer to be rotatable relative to
the main body. A rear portion of the sheet pressing member 80 away
from the reading surface 350a is held in contact with an end of a
movable portion 390a of the solenoid 390. When the printer is not
in the recording-quality check mode, e.g., when the printer is in
the normal recording mode, the sheet pressing member 80 is located
at an original position shown in FIG. 7A. The original position is
on an opposite side to the CIS 50 of the feed path of recording
sheet in the normal recording mode. When at the original position,
the sheet pressing member 80 does not contact with and is held off
of the recording sheet P fed along a two-dot chain line in FIG. 7A.
When the printer is in the recording-quality check mode, the
solenoid 390 is operated to extend the movable portion 390a
leftward as seen in FIG. 7A, thereby displacing the sheet pressing
member 80 from the original position shown in FIG. 7A to an
advanced position shown in FIG. 7B. At the advanced position, the
sheet pressing member 80 is in the feed path of recording sheet in
the normal recording mode, and is opposed to the reading surface
350a of the CIS 350 with a spacing therefrom that corresponds to a
thickness of the recording sheet P.
[0076] Thus, according to the third embodiment, the position of the
CIS 350 and the rotation speeds of the roller pairs 71, 72 are
invariant between the normal recording mode and the
recording-quality check mode, but the feed path of recording sheet
is varied or differentiated, using the sheet pressing member 80,
around the reading point in the feed path where the CIS 350 reads
an image on the recording sheet P.
[0077] The inkjet printer of the third embodiment has a pair of
guides 162, 163, in place of the guide 62. The guide pair 162, 163
has an opening in its central portion. When located at the advanced
position, the sheet pressing member 80 is accommodated in this
opening. The guides 162, 163 are each a plate-like member and
disposed to be opposed to two opposite surfaces of the recording
sheet P being fed, respectively.
[0078] In the printer of the third embodiment, the controller 100
implements a recording-quality check processing routine illustrated
in FIG. 6, instead of that in FIG. 2, upon receiving a test
printing instruction.
[0079] The recording-quality check processing routine begins with
step S31 in which the controller 100 operates the solenoid 390 to
extend its movable portion 390a so as to displace the sheet
pressing member 80 from the original position shown in FIG. 7A to
the advanced position shown in FIG. 7B. Then, the processing
routine goes to step S10 in which the controller 100 implements the
same processing of the test recording operation as in the first
embodiment, while the sheet pressing member 80 is held at the
advanced position. In the following step S13, the controller 100
determines whether the surface of the recording sheet P contacts
the reading surface 350a of the CIS 350.
[0080] When the surface of the recording sheet P contacts the
reading surface 350a, an affirmative decision (YES) is made in step
S10 and the routine goes to step S15, in which the controller 100
controls the operation of the CIS 350 so as to read the image
recorded on the recording sheet P as the result of the test
recording operation. In the following steps S16 and 517, the
controller 100 implements the same operation-adjustment processing
as in the first embodiment. Then, the routine goes to step S32 in
which the controller 100 operates the solenoid 390 to retract the
movable portion 390a so as to displace the sheet pressing member 80
from the advanced position shown in FIG. 7B to the original
position shown in FIG. 7A.
[0081] The recording sheet P entering the spacing between the
guides 162, 163 is contacted with an end of the sheet pressing
member 80 and then directed along an outer surface of the sheet
pressing member 80 into or in a spacing between the reading surface
350a of the CIS 350 and the sheet pressing member 80. Thus, the
recording sheet P is fed along a feed path indicated by a two-dot
chain line in FIG. 7B. In this way, the sheet pressing member 80
functions to differentiate the feed path of recording sheet in the
recording-quality check mode from that in the normal recording
mode. Therefore, the size (e.g., the diameter and the length) and
the shape of the sheet pressing member 80 are determined so as to
enable the differentiation of the feed path between the
recording-quality check mode and the normal recording mode as
described above. In this embodiment, the sheet pressing member 80
is a cylindrical member having a diameter larger than those of the
roller pairs 71, 72, and designed such that after an end of the
sheet pressing member 80 is contacted with the recording sheet P,
the sheet pressing member 80 directs the recording sheet P in the
spacing between the reading surface 350a of the CIS 350 and the
sheet pressing member 80 preventing the recording sheet P from
being displaced or deviating rightward as seen in FIG. 7B.
[0082] According to the third embodiment, the controller 100
controls the position of the recording sheet P such that the
recording sheet P as located at the reading point in the feed path,
where the recording sheet P is opposed to the reading surface 350a
of the CIS 350 to allow the CIS 350 to read an image on the
recording sheet P, is selectively placed in one of a readable
position shown in FIG. 7B and a retracted position shown in FIG.
7A. In this embodiment, the readable position is where the
recording sheet P contacts the reading surface 350a of the CIS 350,
as shown in FIG. 7B. In this embodiment, the retracted position
where the recording sheet P is farther away from the CIS than at
the reading point is where the recording sheet P is separated or
spaced from the CIS 350, as shown in FIG. 7A. In this way, the
controller 100 controls to place a recording sheet P in the
readable position when an image thereon is to be read, and in the
retracted position when an image is to be recorded thereon so as to
prevent contact between the recording sheet P and the CIS 350,
thereby preventing damage to or deterioration of the CIS 350, as in
the first embodiment.
[0083] The controller 100 changes the position of the recording
sheet P toward the CIS 50 (i.e., to the position shown in FIG. 7B)
to place the recording sheet P in the readable position, and
changes the position of the recording sheet P away from the CIS 50
(i.e., to the position shown in FIG. 7A) to place the recording
sheet P in the retracted position.
[0084] Further, the first and third embodiments have the following
arrangements in common: the CIS 50, 350 is disposed to be capable
of reading an image having been recorded on a recording sheet P
being fed along the feed path extending from the sheet supply tray
123 to the sheet ejection portion 131 via the recording point under
the recording heads 10; the CIS 50, 350 is disposed downstream of
the recording heads 10 with respect to the direction of the feed
path; the controller 100 adjusts the operation of the recording
heads 10 on the basis of the result of the test recording
operation; as a reading unit, the CIS 50, 350 which is of contact
type is employed; and the sheet supply tray 123 and the sheet
ejection portion 131 are used in both recording and reading of an
image. Therefore, the second embodiment can enjoy a part of the
effects of the first embodiment that derives from the arrangements
common with the first and third embodiments.
[0085] Although there have been described several embodiments of
the invention, it is to be understood that the invention is not
limited to the details of the embodiments, but may be otherwise
embodied with various modifications and improvements that may occur
to those skilled in the art, without departing from the scope and
spirit of the invention defined in the appended claims.
[0086] For instance, as long as the reading unit can read an image
recorded on a recording medium fed along a feed path extending via
a recording point where the recording heads records an image, the
sheet supply tray and/or the sheet ejection portion may be
differentiated between the case of recording of an image using the
recording heads and the case of reading of an image using the
reading unit. That is, two sheet supply trays and/or two sheet
ejection portions may be provided to be used in recording of an
image and in reading of an image, respectively.
[0087] The reading unit may not necessarily be of contact type as
the CISs 50, 250, 350, which reads an image while in contact with a
recording surface of a recording medium on which an image is
recorded. That is, a reading unit of a type having a relatively
small focal length and reading an image while in the vicinity of,
or slightly spaced from, a recording surface of a recording medium
may be employed. When a reading unit of such a type is employed in
the printer, the readable position is where a recording sheet P is
slightly spaced from the reading surface 50a, 250a, 350a. Although
this type of reading unit does not contact a recording medium when
reading an image, the relatively small focal length can make the
recording medium and the reading unit contact with each other while
the recording medium is fed. Therefore, even where the invention is
applied to a printer in which the reading unit is of such a
non-contact type, the effect to prevent damage to or deterioration
of the reading unit is enjoyed.
[0088] In the above-described embodiments, the recording sheet P is
selectively placeable in one of the readable position to allow the
CIS to read the image on the recording sheet P and the retracted
position at which the recording sheet P is located away from the
CIS farther than when at the readable position. However, the
retracted position may be a position where the image recorded on
the recording sheet P can be read by the CIS. That is, as long as a
distance between the recording sheet P placed in the retracted
position and the CIS is larger than a distance between the
recording sheet P placed in the readable position and the CIS, it
may or may not be arranged such that the CIS can read the image on
the recording sheet P when the recording sheet P is in the
retracted position. That is, by placing the recording sheet P in
the retracted position, contact between the recording sheet P and
the CIS is prevented, thereby preventing damage to or deterioration
of the CIS.
[0089] In the above-described embodiments, the test recording
operation is implemented based on the test recording instruction
sent to the controller 100 from an external apparatus such as PC.
However, the test recording operation may be implemented at a
predetermined timing, e.g., when the printer 1 is turned on, when
the number of recording sheets on which an image was recorded
reaches a predetermined number, or when a predetermined period of
time has elapsed after the printer 1 is turned on.
[0090] The test recording operation, the processing of reading the
result of the test recording operation, and the
operation-adjustment processing based on the result of the reading
are not essential and may be omitted.
[0091] An image to be read by the reading unit is not limited to an
image recorded in the test recording operation, but may be an image
recorded in the normal recording operation, i.e., an image formed
by the recording heads 10 based on the normal recording
instruction. Further, a recording medium with an image already
recorded thereon may be supplied from the recording-medium supply
position so as to have the image read by the reading unit.
[0092] It is not essential to dispose the reading unit downstream
of the recording heads with respect to the direction of the feed
path, but the reading unit may be disposed upstream of the
recording heads with respect to the direction of the feed path.
Further, it is not essential to juxtapose the reading unit to the
recording heads, and the reading unit may be disposed at a desired
position in the printer as long as the reading unit can read an
image on a recording medium fed along a feed path extending via a
reading point where recording heads can record an image on a
recording medium.
[0093] The structure of the feeding unit for feeding a recording
medium may be variously modified. For instance, in the first
embodiment, the roller pairs 71, 72 as a feeding member are
disposed at respective positions, which are on the upstream and
downstream sides of the reading unit with respect to the direction
of the feed path, and differs vertically and horizontally from each
other so as to facilitate bending of a recording medium toward the
reading unit by utilization of gravitation. However, the positions
of the roller pairs 71, 72 are not limited thereto but may be
variously changed. Further, in place of the roller pairs 71, 72, a
feeding member not a roller member, e.g., a sliding mechanism, may
be employed. The guides 62, 162, 163, 63 may be omitted. Further,
the guides 62, 162, 163, 63 may be shaped otherwise than as shown
in FIGS. 1, 3A, 3B, 5A, 5B, 7A, 7B, that is, it is not essential to
have the part of the guides 62, 162, 163, 63 between the roller
pairs 71, 72 curve to surround the CIS 50, 250, 350.
[0094] Adjusting operations of a plurality of feeding members
(roller pairs 71, 72) to bend the recording medium toward the
reading unit at the portion of the feed path between the feeding
members is not limited to adjusting an operation speed (e.g.,
rotation speed) thereof as in the first embodiment, but may be
adjusting a direction of the operation (e.g., rotation) thereof,
for instance. In the state where the recording sheet P is nipped
between the upstream and downstream roller pairs 71, 72, the
rotation direction of only the downstream roller pair 72 is
reversed, that is, the downstream roller pair 72 is rotated in the
direction to feed the recording sheet P to the downstream side,
thereby bending the recording sheet P toward the reading
portion.
[0095] In the second and third embodiments, a solenoid 90, 390 is
employed as means for displacing the CIS 250 and the sheet pressing
member 80. However, the means for displacing the CIS 250 and the
sheet pressing member 80 is not limited to a solenoid, but the CIS
250 and the sheet pressing member 80 may be otherwise
displaced.
[0096] In the first and second embodiments, a position controller
operates to control the position or shape of the recording medium
for selectively placing in one of the readable and retracted
positions a recording medium as located at the reading point in the
feed path. More specifically, in the first embodiment, a portion of
the controller 100 that operates to control the position or shape
of the recording medium around the reading point by adjusting the
operations of the roller pairs 71, 72 of the feeding unit
constitutes the position controller. In the third embodiment, a
portion of the controller 100 that operates to control the position
or shape of the recording medium around the reading point by use of
the sheet pressing member 80 cooperates with the sheet pressing
member 80 and the solenoid 390 to constitute the position
controller. However, these modes are described by way of example
only, and various other members and/or processings may be employed
as the position controller.
[0097] In the above-described embodiments, the controller 100
controls the position of only one of the recording sheet P and the
CIS 50 so as to make the recording sheet P selectively placeable in
one of the readable position allowing the CIS to read the image and
the retracted position at which the recording sheet is farther away
from the CIS than at the readable position. However, this is not
essential. For instance, the controller 100 may place the recording
sheet P in the readable position by controlling the roller pairs
71, 72 to displace the recording sheet P toward the CIS 50, and at
the same time controlling to displace the CIS 50 toward the
recording sheet P. Such a control enables to quickly place the
recording sheet P in the readable position.
[0098] The number of recording heads included in the image
recording apparatus according to the invention may not be four, but
may be any number at least one.
[0099] The type of the recording heads included in the image
recording apparatus according to the invention may be either line
or serial. Further, the recording heads may eject a liquid other
than ink. It is not essential that the recording heads are of
liquid ejection type, but other types of recording heads such as
thermal, dot impact, and laser types of recording heads may be
employed as long as the recording heads can record an image on a
recording medium.
[0100] The invention is applicable to apparatuses other than
printer, such as facsimile machine and copy machine.
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