JP2013063526A - Image forming device - Google Patents

Image forming device Download PDF

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Publication number
JP2013063526A
JP2013063526A JP2011202179A JP2011202179A JP2013063526A JP 2013063526 A JP2013063526 A JP 2013063526A JP 2011202179 A JP2011202179 A JP 2011202179A JP 2011202179 A JP2011202179 A JP 2011202179A JP 2013063526 A JP2013063526 A JP 2013063526A
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JP
Japan
Prior art keywords
carriage
head
scanning
plate
head holder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
JP2011202179A
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Japanese (ja)
Inventor
Kenji Shimizu
健司 清水
Shinichiro Naruse
慎一郎 成瀬
Takayuki Niihara
貴之 新原
Original Assignee
Ricoh Co Ltd
株式会社リコー
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Publication date
Application filed by Ricoh Co Ltd, 株式会社リコー filed Critical Ricoh Co Ltd
Priority to JP2011202179A priority Critical patent/JP2013063526A/en
Publication of JP2013063526A publication Critical patent/JP2013063526A/en
Withdrawn legal-status Critical Current

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Abstract

There is a need to increase the positional accuracy between recording heads when a plurality of head holders are mounted on a carriage.
An intermediate member 101 is provided with a plate member 131 that can be bent, and a carriage 5 is provided with an eccentric member 132 that can be rotated in one or both directions, and an upper end portion 131a of the plate member 131 is provided. Can be displaced in the sub-scanning direction perpendicular to the main scanning direction by being pushed by the eccentric member 132, and the lower end portion 131b hits and comes into contact with the abutting portion 158 provided on the back surface of the head holder 51B on the reference shaft member 71 side. The intermediate portion 131c is inserted into the insertion portion 101c of the intermediate member 101 so that the movement of the upper end portion 131a in the direction in which the upper end portion 131a is displaced is restricted. By displacing, the lower end 131b is displaced and the head holder 51B moves in the sub-scanning direction.
[Selection] Figure 6

Description

  The present invention relates to an image forming apparatus.
  As an image forming apparatus such as a printer, a facsimile, a copying machine, a plotter, or a complex machine of these, for example, a liquid discharge recording type image forming apparatus using a liquid discharge head (droplet discharge head) for discharging droplets as a recording head An ink jet recording apparatus is known.
  By the way, when an image is formed in an image forming apparatus using a liquid ejection method, the landing accuracy of droplets ejected from nozzles greatly affects the image quality, and if the landing accuracy of droplets is poor, the image quality is degraded. Therefore, it is necessary to position the recording head with high accuracy.
  On the other hand, it is necessary to make it possible to easily replace the head under the usage environment of the user, such as when a discharge failure occurs in the recording head. In this case as well, reproducibility with high position accuracy must be provided.
  2. Description of the Related Art Conventionally, a head holder for mounting a plurality of liquid discharge heads and a carriage for detachably holding the head holder are provided as positioning accuracy at the time of head replacement, and the head holder is a carriage provided on the carriage. A positioning unit that is in contact with a positioning reference in the scanning direction and the sheet conveyance direction is known, and the positioning unit serves as a positioning reference for the head holder of the liquid ejection head (Patent Document 1).
  As a recording head positioning structure, the carriage is rotatable relative to the carriage body via the sub carriage and a carriage body that reciprocates along the main carriage guide shaft and the sub carriage guide shaft provided in the main scanning direction. And a recording head mounted so as to be movable in the sub-scanning direction, and a first, which is interposed between the carriage body and the sub-carriage, and presses the recording head against the main carriage guide shaft and the sub-carriage guide shaft, respectively. And what is provided with the 2nd biasing member is known (patent document 2).
JP 2011-037235 A JP 2007-190868 A
  However, in the configuration disclosed in Patent Document 1 described above, the positioning of the head holder with respect to the carriage is performed by the positioning surface and the positioning pins, which makes the configuration complicated. Further, when a plurality of head holders are provided, a positioning portion is required for each head holder, and it is difficult to position the head holders with each other, and the head cannot be easily replaced.
  The present invention has been made in view of the above problems, and enables the head to be easily replaced by enabling the relative positional accuracy of the recording heads mounted on the plurality of head holders to be positioned with high accuracy with a simple configuration. The purpose is to.
In order to solve the above problems, an image forming apparatus according to the present invention provides:
A recording head having a plurality of nozzles for discharging droplets;
A first head holder and a second head holder for holding one or more recording heads;
A carriage for holding the first and second head holders,
The carriage is movable along a guide member disposed in a main scanning direction;
The carriage has a reference member disposed in the same direction as the guide member,
The first and second head holders are detachably hooked and held on the reference member,
The carriage is provided with a plate-like member that can be bent and an eccentric member that can rotate in one or both directions,
One end of the plate-like member is pushed by the eccentric member and can be displaced in the sub-scanning direction orthogonal to the main scanning direction,
The other end of the plate-like member is located on the back side of the second head holder on the reference member side,
The intermediate portion of the plate-like member is restricted from moving in the direction in which the one end portion is displaced,
By rotating the eccentric member, one end portion of the plate-like member is displaced in the sub-scanning direction, and the other end portion is displaced in the direction opposite to the one end portion, whereby the second head holder is displaced in the sub-scanning direction. It was configured to move in the scanning direction.
An image forming apparatus according to the present invention includes:
A recording head having a plurality of nozzles for discharging droplets;
A first head holder and a second head holder for holding one or more recording heads;
A carriage for holding the first and second head holders,
The carriage is movable along a guide member disposed in a main scanning direction;
The carriage has a reference member disposed in the same direction as the guide member,
The first and second head holders are detachably hooked and held on the reference member,
An intermediate member is provided between the carriage and the first and second head holders,
The intermediate member is provided with a plate-like member that can be bent, and the carriage is provided with an eccentric member that is rotatable in one or both directions.
One end of the plate-like member is pushed by the eccentric member and can be displaced in the sub-scanning direction orthogonal to the main scanning direction,
The other end of the plate-like member is located on the back side of the second head holder on the reference member side,
The intermediate portion of the plate-like member is restricted from moving in the direction in which the one end portion is displaced,
By rotating the eccentric member, one end portion of the plate-like member is displaced in the sub-scanning direction, and the other end portion is displaced in the direction opposite to the one end portion, whereby the second head holder is displaced in the sub-scanning direction. It was configured to move in the scanning direction.
  According to the image forming apparatus of the present invention, the relative positional accuracy of the recording heads mounted on the plurality of head holders can be positioned with high accuracy with a simple configuration, and head replacement is facilitated.
1 is an external perspective view illustrating an entire configuration of an example of an image forming apparatus according to the present invention. It is a perspective explanatory view of a carriage scanning mechanism part of the same device. It is a typical perspective explanatory view of a carriage part explaining a state before mounting a head holder on a carriage. It is a perspective explanatory view of a carriage portion for explaining a state where an intermediate member is mounted on the carriage. It is a perspective explanatory view of a carriage portion for explaining a state where the head holder is mounted on the carriage. FIG. 9 is a cross-sectional explanatory view corresponding to the line CC of FIG. 8 for explaining the position adjustment mechanism of the second head holder in the first embodiment of the present invention. FIG. 9 is a cross-sectional explanatory view corresponding to the line CC in FIG. 8 in a state where the head holder is also moved. It is a back explanatory drawing of an intermediate member similarly. It is principal part perspective explanatory drawing with which it uses for description of the holding structure of the plate-shaped member in 2nd Embodiment of this invention. It is principal part perspective explanatory drawing with which it uses for description of the holding structure of the eccentric member in 3rd Embodiment of this invention. It is sectional explanatory drawing with which it uses for description of 4th Embodiment of this invention. It is a section explanatory view of the state where the head holder was similarly moved.
  Embodiments of the present invention will be described below with reference to the accompanying drawings. An example of an image forming apparatus according to the present invention will be described with reference to FIGS. 1 is an explanatory perspective view showing the overall configuration of the recording apparatus, and FIG. 2 is an explanatory perspective view of the carriage scanning mechanism.
  This image forming apparatus is a serial type ink jet recording apparatus, and includes an apparatus main body 1 and a support base 2 that supports the recording apparatus main body 1.
  Inside the apparatus main body 1, a guide rod 3 and a guide stay 4, which are guide members, are spanned on both side plates (not shown), and a carriage 5 can slide in the direction indicated by the arrow A on the guide rod 3 and the guide stay 4. Is held in.
  On the carriage 5, a recording head 6 including a liquid ejection head that ejects ink droplets of each color of black (K), yellow (Y), magenta (M), and cyan (C) is mounted. Although not shown, each recording head 6 is integrally provided with a head tank that supplies ink to each recording head.
  The main scanning mechanism 10 that moves and scans the carriage 5 is disposed on one side in the main scanning direction, a driving pulley 12 that is rotationally driven by the driving motor 11, and on the other side in the main scanning direction. The driven pulley 13 is provided, and a timing belt 14 that is a pulling member wound between the drive pulley 12 and the driven pulley 13 is provided. The driven pulley 13 is tensioned outward (in a direction away from the drive pulley 12) by a tension spring (not shown).
  Among the main scanning areas in the carriage 5, in the recording area, the paper 20 is intermittently moved in the direction orthogonal to the main scanning direction of the carriage 5 by the suction conveyance unit 7 (sub-scanning direction, paper conveyance direction: arrow B direction). Be transported.
  In addition, a maintenance / recovery mechanism 8 that performs maintenance / recovery of the recording head 6 is disposed in one end side region of the main scanning region. Further, a main cartridge 9 containing each color ink to be supplied to the sub tank of the recording head 6 is located outside the carriage movement area in the main scanning direction or in the other end side area of the main scanning area. And is detachably mounted.
  In addition, roll paper (hereinafter referred to as “paper”) 20 is set in the paper supply unit 21, but roll papers having different sizes in the width direction can be set. The sheet 20 conveyed from the sheet feeding unit 21 is conveyed from the rear of the apparatus main body 1 to the front by the conveying unit to the recording area. Then, the carriage 5 is moved in the main scanning direction, and the recording head 6 is driven according to the image information to eject droplets while intermittently feeding the paper 20 by the suction conveyance unit 7. A required image is formed. Further, the paper 20 after the image formation is cut to a predetermined length and discharged to a paper discharge tray (not shown) arranged on the front side of the apparatus main body 1.
  Next, the configuration of the carriage portion will be described with reference to FIGS. 3 is a schematic perspective explanatory view of the carriage portion explaining a state before the head holder is mounted on the carriage, FIG. 4 is a perspective explanatory view of the carriage portion illustrating a state where the intermediate member is mounted on the carriage, and FIG. FIG. 4 is a perspective explanatory view of a carriage portion for explaining a state where the head holder is mounted on the carriage.
  The carriage 5 holds a black head holder 51A and a color head holder 51B. In the present embodiment, the head holder 51A is a first head holder, and the head holder 51B is a second head holder.
  The head holder 51A is equipped with two recording heads 6A and 6B that discharge black droplets arranged in a staggered manner in the sub-scanning direction. The head holder 51B is mounted with three recording heads 6C, 6D, and 6E that discharge yellow, magenta, and cyan droplets at the same position in the sub-scanning direction as the recording head 6A. As described above, when the recording heads are not distinguished, they are referred to as “recording head 6”. The number of recording heads 6 held by the head holders 51A and 51B may be one.
  Here, the carriage 5 is provided with a reference shaft member 71 as a reference member in the same direction as the guide rod 3. The head holders 51A and 51B (hereinafter referred to as “head holder 51” when not distinguished from each other) are provided with hook-shaped hook portions 53 that are detachably fitted to the reference shaft member 71, and the head holders 51A and 51B. Is held by the carriage 5 by hooking the hook portion 53 on the reference shaft member 71. Note that the reference shaft member 71 may have a cylindrical shape or a polygonal shape.
  Thus, by arranging the reference shaft member 71 in the same direction as the guide member 3 of the carriage 5, the positional accuracy of the tilt in the sub-scanning direction, the height direction, the tilt direction, and the main scanning direction is improved.
  In this embodiment, when head replacement is performed, for example, when the recording heads 6A and 6B are replaced, the head holder 51 is detached from the reference shaft member 71, and the replaced head holder 51 is hooked on the reference shaft member 71 and held. .
  Thereby, the head position accuracy of the replaced head holder 51 can be reproduced, and high position accuracy can be obtained for the head 6 of the other head holder 51.
  In the present embodiment, the intermediate member 101 is interposed between the reference shaft member 71 and the head holders 51A and 51B.
  The intermediate member 101 is provided with support shaft members 103 at both ends in the same direction as the reference shaft member 71, and is supported by through holes 170 provided on both side walls of the carriage 5.
  Next, the position adjustment mechanism of the second head holder in the first embodiment of the present invention will be described with reference to FIGS. 6 is a cross-sectional explanatory view corresponding to the CC line in FIG. 8 for explaining the embodiment, and FIG. 7 is a cross-sectional explanatory view corresponding to the CC line in FIG. 8 in a state where the head holder is also moved. FIGS. 8 and 8 are explanatory views of the back surface of the intermediate member.
  Between the head holder 51A and the intermediate member 101, the abutable portion 158 of the head holder 51A of the intermediate member 101 hits and contacts the deformable portion 101b, thereby deforming the head holder 51A in the sub-scanning direction. An adjustment mechanism 130 for adjusting the position is provided.
  In this adjustment mechanism 130, the intermediate member 101 is provided with a plate-like member 131 that can be bent, and the carriage 5 is provided with an eccentric member 132 that is rotatable in one direction or both directions.
  An upper end portion 131a which is one end portion of the plate-like member 131 is pushed by the eccentric member 132 and can be displaced in the sub-scanning direction orthogonal to the main scanning direction. Here, the eccentric member 132 is arranged on the downstream side in the sub-scanning direction with respect to the plate-like member 131, and pushes the upper end 131a upstream in the sub-scanning direction.
  Further, the lower end 131b, which is the other end of the plate-like member 131, is in contact with the rear surface (head) of the deformable portion 101b that is in contact with the abutting portion 158 provided on the rear surface of the head holder 51B on the reference shaft member 71 side. The contact portion 158 of the holder 51B abuts against and contacts the surface opposite to the surface on which the contact portion 158 abuts.
  Further, the intermediate portion 131c of the plate-like member 131 is restricted from moving in the direction in which the upper end portion 131a is displaced by being inserted into the insertion portion 101c of the intermediate member 101. In this case, the insertion portion 101c has a shape that restricts the intermediate portion 131c from being displaced upstream and downstream in the sub-scanning direction.
  As a result, the plate-like member 131 functions in the same manner as a lever member in which the upper end portion 131a serves as a force point to be pushed by the eccentric member 132, the intermediate portion 131c serves as a fulcrum, and the lower end portion 131b serves as an action point.
  On the other hand, the eccentric member 132 provided on the carriage 5 side is attached with an eccentric cam 134 that comes into contact with the upper end portion 131a of the plate-like member 131 on a rod 133 that is rotatably held on the carriage 5 in one or both directions. An operation knob 135 is provided at the end of the rod 133.
  With this configuration, by rotating the eccentric member 132 from the state shown in FIG. 6, the upper end 131a of the plate-like member 131 is pushed upstream in the sub-scanning direction by the eccentric cam 134 as shown in FIG. The plate-like member 131 is deformed, and the lower end portion 131b is displaced downstream in the sub-scanning direction with the intermediate portion 131c as a fulcrum.
  As a result, the deformable portion 101b of the intermediate member 101 is pushed to the head holder 51B side (the downstream side in the sub-scanning direction), and as a result, the head holder 51B is pushed to the downstream side in the sub-scanning direction, which is the arrow direction. 51B rotates around the reference shaft member 71 in the direction of the arrow, and the position of the head holder 51B in the sub-scanning direction is adjusted.
  By adjusting the position of the head holder 51B in the sub scanning direction, the positions of the recording heads 6C to 6E mounted on the head holder 51B and the recording head 6A mounted on the head holder 51A are positioned with high accuracy. be able to.
  Since the position of the head holder 51B in the sub-scanning direction can be positioned with high accuracy in this way, even when the head is replaced, the relative positional accuracy between the recording heads of the plurality of head holders can be increased, and the head can be easily replaced. Become.
  Here, since the head holder 51B is adjusted by applying a force from the eccentric member 132 around the insertion portion 101c serving as a fulcrum centering on the reference shaft member 71, the head holder in a direction perpendicular to the transport direction. If a force is not applied to the contact surface between 51B and the intermediate member 101 (the contact surface between the butting portion 158 and the deformable portion 101b), the center of the reference shaft member 71 may not be adjusted. That is, there is a possibility that a force is applied in a direction in which the head holder 51 </ b> B is separated from the reference shaft member 71. Therefore, a force is applied from the contact surface between the head holder 51B and the intermediate member 101 in a direction perpendicular to the sub-scanning direction.
  Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 9 is an explanatory perspective view of a main part for explaining the holding structure for the plate-like member in the embodiment.
  In the present embodiment, the intermediate member 101 is formed with a convex portion 141 that fits into a through hole 131 d formed in the lower end portion 131 b of the plate-like member 131.
  Thereby, the height direction position and the main scanning direction position of the plate-like member 131 are regulated.
  Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 10 is an explanatory perspective view of a main part for explaining the structure for holding the eccentric member in the embodiment.
  In the present embodiment, the cam 134 of the eccentric member 132 is held by the arc-shaped portion 151 provided on the carriage 5 to regulate the height direction position and the sub-scanning direction position, and the main scanning direction is the rod of the eccentric member 132. This is regulated by increasing the diameter of the outer portion 133a of the rod 133 of the eccentric member 132 with respect to the hole of the carriage 5 into which the 133 is inserted.
  Next, a fourth embodiment of the present invention will be described with reference to FIGS. 11 is a cross-sectional explanatory view for explaining the embodiment, and FIG. 12 is a cross-sectional explanatory view in a state where the head holder is also moved.
  In the present embodiment, the eccentric member 132 is arranged on the upstream side in the sub scanning direction with respect to the plate member 131 and pushes the upper end portion 131a of the plate member 131 downstream in the sub scanning direction. The lower end 131b, which is the other end of the plate-like member 131, is in contact with the rear surface side of the deformable portion 101b that is in contact with the abutting portion 158 provided on the rear surface of the head holder 51B on the reference shaft member 71 side. Bonded and fixed.
  Further, the middle portion 131c of the plate-like member 131 is restricted from moving in the direction in which the upper end portion 131a is displaced by being inserted into the insertion portion 101c of the intermediate member 101. In this case, the insertion portion 101c has a shape that restricts the intermediate portion 131c from being displaced downstream in the sub-scanning direction.
  With this configuration, when the eccentric member 132 is rotated from the state shown in FIG. 11, the upper end 131a of the plate-like member 131 is pushed downstream in the sub-scanning direction by the eccentric cam 134 as shown in FIG. The plate-like member 131 is deformed, and the lower end portion 131b is displaced upstream in the sub-scanning direction with the intermediate portion 131c as a fulcrum.
  As a result, the deformable portion 101b of the intermediate member 101 is pulled to the side opposite to the head holder 51B side (upstream side in the sub scanning direction), and as a result, the head holder 51B is pulled to the upstream side in the sub scanning direction that is the arrow direction. The head holder 51B rotates in the direction of the arrow about the reference shaft member 71, and the position of the head holder 51B in the sub-scanning direction is adjusted.
  By adjusting the position of the head holder 51B in the sub scanning direction, the positions of the recording heads 6C to 6E mounted on the head holder 51B and the recording head 6A mounted on the head holder 51A are positioned with high accuracy. be able to.
  In each of the embodiments described above, the intermediate member is provided between the carriage and the head holder, and the intermediate member is provided with the plate-like member. However, the intermediate member may not be provided. In this case, the plate-like member may be provided on the carriage, and the portion where the plate-like member of the carriage is provided may have the same configuration as the intermediate member of the above embodiment.
  In the present application, the “paper” is not limited to paper, but includes OHP, cloth, glass, a substrate, etc., and means a material to which ink droplets or other liquids can be attached. , Recording media, recording paper, recording paper, and the like. In addition, image formation, recording, printing, printing, and printing are all synonymous.
  The “image forming apparatus” means an apparatus that forms an image by discharging liquid onto a medium such as paper, thread, fiber, fabric, leather, metal, plastic, glass, wood, ceramics, etc. “Formation” means not only giving an image having a meaning such as a character or a figure to a medium but also giving an image having no meaning such as a pattern to the medium (simply causing a droplet to land on the medium). ) Also means.
  The “ink” is not limited to an ink unless otherwise specified, but includes any liquid that can form an image, such as a recording liquid, a fixing processing liquid, or a liquid. Used generically, for example, includes DNA samples, resists, pattern materials, resins, and the like.
  In addition, the “image” is not limited to a planar image, and includes an image given to a three-dimensionally formed image and an image formed by three-dimensionally modeling a solid itself.
  Further, the image forming apparatus includes both a serial type image forming apparatus and a line type image forming apparatus, unless otherwise limited.
DESCRIPTION OF SYMBOLS 1 Apparatus main body 5 Carriage 6, 6A-6D Recording head 10 Carriage scanning mechanism part 51, 51A, 51B Head holder 53 Hook part 71 Reference | standard shaft member (reference | standard member)
130 Adjustment mechanism 131 Plate member 132 Eccentric member

Claims (4)

  1. A recording head having a plurality of nozzles for discharging droplets;
    A first head holder and a second head holder for holding one or more recording heads;
    A carriage for holding the first and second head holders,
    The carriage is movable along a guide member disposed in a main scanning direction;
    The carriage has a reference member disposed in the same direction as the guide member,
    The first and second head holders are detachably hooked and held on the reference member,
    The carriage is provided with a plate-like member that can be bent and an eccentric member that can rotate in one or both directions,
    One end of the plate-like member is pushed by the eccentric member and can be displaced in the sub-scanning direction orthogonal to the main scanning direction,
    The other end of the plate-like member is located on the back side of the second head holder on the reference member side,
    The intermediate portion of the plate-like member is restricted from moving in the direction in which the one end portion is displaced,
    By rotating the eccentric member, one end portion of the plate-like member is displaced in the sub-scanning direction, and the other end portion is displaced in the direction opposite to the one end portion, whereby the second head holder is displaced in the sub-scanning direction. An image forming apparatus that moves in a scanning direction.
  2. A recording head having a plurality of nozzles for discharging droplets;
    A first head holder and a second head holder for holding one or more recording heads;
    A carriage for holding the first and second head holders,
    The carriage is movable along a guide member disposed in a main scanning direction;
    The carriage has a reference member disposed in the same direction as the guide member,
    The first and second head holders are detachably hooked and held on the reference member,
    An intermediate member is provided between the carriage and the first and second head holders,
    The intermediate member is provided with a plate-like member that can be bent, and the carriage is provided with an eccentric member that is rotatable in one or both directions.
    The carriage is provided with a plate-like member that can be bent and an eccentric member that can rotate in one or both directions,
    One end of the plate-like member is pushed by the eccentric member and can be displaced in the sub-scanning direction orthogonal to the main scanning direction,
    The other end of the plate-like member is located on the back side of the second head holder on the reference member side,
    The intermediate portion of the plate-like member is restricted from moving in the direction in which the one end portion is displaced,
    By rotating the eccentric member, one end portion of the plate-like member is displaced in the sub-scanning direction, and the other end portion is displaced in the direction opposite to the one end portion, whereby the second head holder is displaced in the sub-scanning direction. An image forming apparatus that moves in a scanning direction.
  3.   The image forming apparatus according to claim 2, wherein the intermediate member is provided with a protrusion that determines a position in a height direction and a main scanning direction of the plate-like member.
  4.   4. The image forming apparatus according to claim 1, wherein a protrusion that determines a position in a direction along a height direction of the eccentric member and a medium feeding direction is provided. 5.
JP2011202179A 2011-09-15 2011-09-15 Image forming device Withdrawn JP2013063526A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015047836A (en) * 2013-09-04 2015-03-16 株式会社リコー Image formation device
JP2015128830A (en) * 2014-01-06 2015-07-16 株式会社リコー Image formation device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015047836A (en) * 2013-09-04 2015-03-16 株式会社リコー Image formation device
JP2015128830A (en) * 2014-01-06 2015-07-16 株式会社リコー Image formation device

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