JP5929502B2 - Paper feeding device and image forming apparatus - Google Patents

Description

  The present invention relates to a sheet feeding device and an image forming apparatus.

  As an optional device of an image forming apparatus such as a copying machine or a printer, there is a manual paper feeding unit for recording paper. For example, Patent Document 1 proposes a paper feeding device that conveys a recording paper from a manual paper feeding tray to a secondary transfer roller, and is capable of moving outside the image forming apparatus. Further, Patent Document 2 proposes a single sheet feeder configured to be interchangeable with a paper feed cassette of an image forming apparatus.

JP-A-2005-208141 JP 2004-217387 A

  An object of the present invention is to suppress a decrease in nip pressure of a pair of conveyance rolls configured by a conveyance roll provided in a conveyance unit that can be attached to and detached from the casing of the apparatus and a conveyance roll provided in the casing. And

A sheet feeding device according to claim 1 of the present invention includes a plate body that forms a conveyance path for conveying a recording medium, and a pair of wall portions that are arranged to face each other at a side end portion of the plate body, A transport unit having a first roll rotatably arranged in the plate, a housing to which the transport unit is detachably attached, and provided in the housing, the first roll and a roll pair a second roll for transporting the recording medium in the plate on the body formed by, a pressing member that is provided in the housing, or to press the respective side of the pair of wall portions or the pair of walls A pressing member that presses the other side face in a state where one movement of the portion is restricted and warps the plate so as to be convex in the direction of the second roll.

  According to a second aspect of the present invention, there is provided the paper feeding device according to the first aspect, wherein the pressing member is configured so that the transport unit is predetermined in the housing when the transport unit is mounted in the housing. It is a member that guides to a specified position.

  According to Claim 3 of the present invention, in the configuration according to Claim 2, each of the pair of wall portions has a flange, and at least one side surface of the pair of wall portions via the flange. Is pressed by the pressing member.

  According to a fourth aspect of the present invention, there is provided the sheet feeding device according to the third aspect, wherein the pressing member has a groove, and an end portion of the flange is formed when the transport unit is mounted in the casing. And sliding in the groove.

  An image forming apparatus according to a fifth aspect of the present invention forms an image on the paper feeding device according to any one of the first to fourth aspects and a recording medium fed by the paper feeding device. Image forming means.

According to the invention which concerns on Claim 1, 5, compared with the structure which does not have a press member, the conveyance roll provided in the conveyance unit removable from the housing | casing of an apparatus, and the conveyance roll provided in the said housing | casing It is possible to suppress a decrease in the nip pressure of the pair of conveying rolls configured as described above.
According to the invention which concerns on Claim 2, compared with the structure which does not have a press member, with the conveyance roll provided in the conveyance unit removable from the housing | casing of an apparatus, and the conveyance roll provided in the said housing | casing A decrease in the nip pressure of the configured transport roll pair can be suppressed.
According to the invention which concerns on Claim 3, compared with the structure which does not have a press member, with the conveyance roll provided in the conveyance unit removable from the housing | casing of an apparatus, and the conveyance roll provided in the said housing | casing A decrease in the nip pressure of the configured transport roll pair can be suppressed.
According to the invention which concerns on Claim 4, compared with the structure which does not have a press member, with the conveyance roll provided in the conveyance unit removable from the housing | casing of an apparatus, and the conveyance roll provided in the said housing | casing A decrease in the nip pressure of the configured transport roll pair can be suppressed.

1 is a diagram illustrating a configuration of an image forming apparatus 100. FIG. FIG. 3 is a schematic view showing a side surface of a transport unit 21. 3 is a perspective view of a transport unit 21. FIG. FIG. 3 is a diagram illustrating a state in which a transport unit 21 is mounted in the image forming apparatus 100. FIG. 4 is a diagram illustrating a force that acts on a transport unit 21. It is a figure which shows the force which acts with respect to 21 A of conveyance units. FIG. 2 is a diagram illustrating a state where a transport unit 21A is mounted in an image forming apparatus 100. It is a figure which shows the force which acts with respect to the conveyance unit 21B. It is the schematic which shows the side surface of an example of the conveyance unit 21B.

Embodiments of the present invention will be described below with reference to the drawings.
(1) Embodiment FIG. 1 is a diagram showing a configuration of an image forming apparatus 100 according to an embodiment of the present invention. The image forming apparatus 100 is, for example, a printer. As shown in FIG. 1, the image forming apparatus 100 includes a container 1, a paper feeding device 2, developing units 3 </ b> Y, 3 </ b> M, 3 </ b> C, and 3 </ b> K, a transfer unit 4, and a fixing unit 5.

  In the following description, the depth direction when the image forming apparatus 100 is viewed from the front is referred to as the + x direction, and the front direction is referred to as the −x direction. Of the left and right directions, the left direction is called the + y direction, and the right direction is called the -y direction. Also, the upper direction of the height direction is called the + z direction, and the lower direction is called the -z direction. A coordinate symbol depicting two line segments intersecting in a white circle represents an arrow heading from the near side to the far side.

  The container 1 is a member that accommodates a recording medium for forming an image. The container 1 is, for example, a rectangular box that is open at the top. Here, the recording medium is, for example, a recording sheet or a plastic sheet such as an OHP (Overhead Projector) sheet. The recording medium accommodated in the container 1 is taken out by the pickup roll 6 and conveyed to the transfer unit 4 by the conveyance roll pair 7. The recording medium that has passed through the transfer unit 4 and the fixing unit 5 is discharged to the upper surface of the image forming apparatus 100.

  The paper feeding device 2 is a device for manually feeding a recording medium. For example, the paper feeding device 2 is disposed so as to be sandwiched between the container 1 and the developing unit 3 in the z direction. As shown in FIG. 1, the sheet feeding device 2 includes a conveyance unit 21, a conveyance roll 22, and a manual sheet feeding tray 23.

  The transport unit 21 is a member that forms a transport path for transporting the recording medium. The transport unit 21 has, for example, a rectangular and plate shape as a whole. The recording medium is transported in the longitudinal direction (y direction) of the transport unit 21, for example. The transport unit 21 is made of resin, for example. The transport unit 21 is configured to be detachable from the housing of the image forming apparatus 100. A specific configuration of the transport unit 21 will be described later.

  The transport roll 22 is a member for transporting the recording medium. The transport roll 22 is provided in the casing of the image forming apparatus 100 so as to be rotatable. The rotation shaft 25 (see FIG. 4) of the transport roll 22 is provided perpendicular to the longitudinal direction of the transport unit 21, for example. The rotary shaft 25 is driven to rotate by a drive unit (not shown). The transport roll 22 forms a roll pair with the transport roll 214 of the transport unit 21 described later. The area where both rolls contact is called the nip area. The transport roll 22 is an example of a “second roll” according to the present invention.

  The manual paper feed tray 23 is a member for placing a recording medium to be fed. The manual paper feed tray 23 has, for example, a rectangular and plate shape. As shown in FIG. 1, the manual paper feed tray 23 is mounted on a movable wall 213 (see FIG. 2) of a later-described transport unit 21 and is movable. The recording medium placed on the manual paper feed tray 23 is transported on the transport unit 21 by the transport roll 22 and then transported by the transport roll pair 7 to reach the transfer unit 4. The recording medium that has passed through the transfer unit 4 and the fixing unit 5 is discharged to the upper surface of the image forming apparatus 100.

  The developing units 3Y, 3M, 3C, and 3K are devices that form toner images of respective colors. The symbols “Y”, “M”, “C”, and “K” in the developing units 3Y, 3M, 3C, and 3K represent yellow, magenta, cyan, and black toner colors, respectively. Yellow, magenta, cyan, and black toner images are formed. The developing units 3Y, 3M, 3C, and 3K are different in the color of the toner to be handled, but have the same configuration. Therefore, in the following description, when there is no need to distinguish between them, they are collectively referred to as “developing unit 3”. .

  As shown in FIG. 1, the developing unit 3 includes a photosensitive drum 31, a charger 32, an exposure device 33, a developing device 34, and a primary transfer roll 35.

  The photosensitive drum 31 is a member in which a photoconductive film is laminated on the outer peripheral surface thereof, and is rotated in the direction of arrow A1 in FIG. 1 by a driving unit (not shown). The charger 32 charges the surface of the photosensitive drum 31. The exposure device 33 irradiates the photosensitive drum 31 charged by the charger 32 with laser light corresponding to image data output from a control unit (not shown) to form an electrostatic latent image. The developing device 34 contains a two-component developer containing toner of any one of Y, M, C, and K colors and a magnetic carrier such as ferrite powder, and forms an electrostatic latent image formed on the photosensitive drum 31. A toner image is formed by attaching toner. The primary transfer roll 35 is disposed so as to face the photosensitive drum 31 with an intermediate transfer belt 41 to be described later interposed therebetween, and transfers a toner image on the photosensitive drum 31 to the intermediate transfer belt 41 by generating a predetermined potential difference. To do.

  As shown in FIG. 1, the transfer unit 4 includes an intermediate transfer belt 41, a secondary transfer roll 42, a belt transport roll 43, and a backup roll 44.

  The intermediate transfer belt 41 is an endless belt-like member and is stretched between a belt conveyance roll 43 and a backup roll 44. The intermediate transfer belt 41 is rotated in the direction of arrow A2 in FIG. 1 by a belt conveyance roll 43 or a backup roll 44. The secondary transfer roll 42 is disposed so as to face the backup roll 44 with the intermediate transfer belt 41 interposed therebetween. A toner image on the intermediate transfer belt 41 is conveyed by the conveyance roll pair 7 by generating a predetermined potential difference. Transfer to the recording medium. The transfer unit 4 is an example of the “image forming unit” according to the present invention.

The fixing unit 5 includes a fixing roll and a pressure roll. The fixing unit 5 performs a fixing process of applying heat and pressure to the recording medium on which the toner image is transferred, and fixes the toner image on the recording medium.
The above is the outline of the configuration of the image forming apparatus 100.

  Next, a specific configuration of the transport unit 21 will be described. FIG. 2 is a schematic view showing a side surface of the transport unit 21. FIG. 3 is a perspective view showing the back surface (the surface in the −z direction) and the side surface (the surface in the + x direction) of the transport unit 21. 2 and 3, the transport unit 21 includes a plate body 211, a pair of side walls 212, a pair of movable walls 213, a transport roll 214, a pair of flanges 215, and a pair of latches 216. And ribs 217. The transport unit 21 has a U-shape as a whole.

  The plate body 211 is a member that forms a transport path for transporting the recording medium. The plate body 211 is, for example, a rectangular and plate-shaped member. The recording medium is conveyed in the longitudinal direction (y direction) of the plate body 211, for example. As shown in FIGS. 2 and 3, the plate body 211 may have undulations or may be flat. The surface (the surface in the + z direction) of the plate body 211 is a transport surface that transports the recording medium and faces the transport roll 22. Ribs extending in the longitudinal direction of the plate 211 may be provided on the surface of the plate 211 in order to reduce friction with the recording medium. Ribs 217 are provided on the back surface (surface in the −z direction) of the plate body 211 in order to improve rigidity. For example, the rib 217 may be configured by a plurality of plate bodies extending in the longitudinal direction of the plate body 211 and a plurality of beam portions connecting the plate bodies.

  The pair of side walls 212 are plate-like members that are disposed so as to face each other across the plate body 211 at the side end portion of the back surface of the plate body 211. For example, as illustrated in FIG. 3, the side wall 212 is formed so as to extend perpendicularly to the plate body 211 at a side end portion extending in the longitudinal direction of the plate body 211. The angle at which the side wall 212 extends is not necessarily vertical. The side wall 212 is an example embodiment that corresponds to the “wall portion” according to the present invention.

  The pair of movable walls 213 is a structure installed on the side wall 212 so as to face each other with the plate body 211 interposed therebetween. The movable wall 213 is installed on the rear end side surface (the inner surface on the −y direction side) of the side wall 212. The pair of movable walls 213 are connected to each other by a rotation shaft (not shown) and are installed on the side walls 212 so as to be rotatable by a predetermined angle. As described above, the manual feed tray 23 is attached to the movable wall 213.

  The transport roll 214 is a member for transporting the recording medium, and is provided so as to be rotatable in the plate body 211. A rotation shaft (not shown) of the transport roll 214 is provided, for example, perpendicular to the longitudinal direction of the plate body 211. The transport roll 214 forms a roll pair with the transport roll 22 as described above. The transport roll 214 rotates following the rotation of the transport roll 22. The transport roll 214 is an example of the “first roll” according to the present invention.

  The pair of flanges 215 are members provided so as to extend along the longitudinal direction (y direction) of the side wall 212 at the end of the side wall 212 in the −z direction. The pair of flanges 215 are installed on the side wall 212 so as to face each other across the plate body 211. The flange 215 has an L-shaped cross section, and includes a first plate portion 2151 extending outward from the side wall 212 and a first plate portion 2151 extending downward (−z direction) from the end portion of the first plate portion 2151. 2 plate portions 2152. For example, the first plate portion 2151 extends perpendicular to the side wall 212, and the second plate portion 2152 extends, for example, parallel to the side wall 212. In the example shown in FIGS. 2 and 3, only the front end portion (the end portion on the + y direction side) of the flange 215 has a T-shaped cross section.

  The pair of latches 216 are members for positioning the transport unit 21 in the image forming apparatus 100. The pair of latches 216 are provided on the outer surfaces of the side walls 212, respectively. For example, the pair of latches 216 are installed on the side wall 212 so as to face each other with the plate body 211 interposed therebetween.

The latch 216 is mainly composed of two upper and lower members, for example, and the upper member is biased upward (+ z direction) by a spring. When the transport unit 21 is inserted into the image forming apparatus 100, the upper member of the latch 216 comes into contact with a downward projecting portion (not shown) (not shown) provided in the apparatus. When the latch 216 passes under the protrusion, it returns to its original position. The latch 216 that has passed under the projection is restricted from moving in the -y direction by the projection. As a result, the movement of the transport unit 21 in the −y direction is restricted.
The above is the description of the configuration of the transport unit 21.

  Next, a method for attaching the transport unit 21 to the image forming apparatus 100 will be described. FIG. 4 is a diagram illustrating a state where the transport unit 21 is mounted in the image forming apparatus 100. 4 is a cross-sectional view taken along the line II of FIG.

  The pair of rails 24 shown in FIG. 4 are members for guiding the conveyance unit 21 to a predetermined position in the image forming apparatus 100. The pair of rails 24 are arranged in the housing of the image forming apparatus 100 so as to extend perpendicular to the rotation shaft 25 of the transport roll 22, for example. In addition, the pair of rails 24 are installed to face each other below (−z direction) the transport roll 22. The pair of rails 24 is an example of the “pressing member” according to the present invention. Each of the pair of rails 24 includes a groove 241 and an abutment surface 242 as shown in FIG. 4.

  The groove 241 is formed so as to extend in the longitudinal direction (y direction) of the rail 24. The groove 241 is formed so as to open upward (+ z direction). As shown in FIG. 4, a flange 215 (more specifically, the second plate portion 2152) of the conveyance unit 21 is inserted into the groove 241, and the conveyance unit 21 is inserted into the image forming apparatus 100. In addition, the flange 215 (more specifically, the second plate portion 2152) slides in the groove 241. The groove 241 restricts the movement of the transport unit 21 in the width direction (x direction).

  The abutting surface 242 is a surface provided inside the rail 24. In other words, it is a surface provided on the side facing the other rail 24. The abutting surface 242 may be, for example, a surface perpendicular to the rotation shaft 25 of the transport roll 22, and the abutting surface 242 may be a flat surface.

  The abutting surface 242 contacts the flange 215 of the transport unit 21 when and after the transport unit 21 is mounted. More specifically, when the second plate portion 2152 of the flange 215 is inserted into the groove 241, it contacts the outer surface of the second plate portion 2152. The abutting surface 242 restricts the movement of the transport unit 21 in the width direction.

  A distance D1 (see FIG. 4) from one abutting surface 242 to the other abutting surface 242 is set to be shorter than a length L1 (see FIG. 3) of the transport unit 21 in the width direction. Here, the length L1 in the width direction of the transport unit 21 is the length from the outer surface of one second plate portion 2152 to the outer surface of the other second plate portion 2152. For example, when the length L1 is 300 mm, the distance D1 is set to 298 mm. Therefore, the outer surface of the second plate portion 2152 of the transport unit 21 is pressed inward by the abutting surface 242 when the transport unit 21 is mounted and after the mounting.

  FIG. 5 is a diagram illustrating the force acting on the transport unit 21. In FIG. 5, the configuration of the transport unit 21 is simplified.

  As described above, as a result of the outer surface of the second plate portion 2152 of the transport unit 21 being pressed by the abutting surface 242, the outer surface of the side wall 212 of the transport unit 21 has a force as shown in FIG. F1 and force F2 are applied. The force F1 is a force having a + x direction component, and the force F2 is a force having a −x direction component.

  As a result of the force F1 and the force F2 being applied to the side wall 212, the plate body 211 of the transport unit 21 is warped upward (in the + z direction) as indicated by an arrow A3. In other words, the plate 211 is warped so as to be convex in the direction of the transport roll 22. As a result, the transport roll 214 provided on the plate body 211 is closer to the transport roll 22 as compared with the case where the plate body 211 is not warped. As a result, the transport roll 214 and the transport roll 22 are separated. The applied pressure (nip pressure) is more applied than when the plate body 211 is not warped.

  As described above, according to the present embodiment, the distance between the pair of abutting surfaces 242 is set so that the plate body 211 of the transport unit 21 is warped in the direction of the transport roll 22. Therefore, the occurrence of a situation where the intended nip pressure is not ensured by the escape of the transport roll 214 of the transport unit 21 from the transport roll 22 is suppressed. In addition, the occurrence of a situation in which the intended nip pressure is not secured due to deformation of the transport unit 21 due to environmental changes or deterioration over time is suppressed.

(2) Modifications The above embodiment may be modified as follows. The following modifications may be combined with each other.

(2-1) Modification 1
In the above-described embodiment, the plate body 211 is warped so as to protrude toward the transport roll 22 by applying a force to the outer surface of the side wall 212 of the transport unit 21. However, the plate 211 may be warped so as to be convex in the direction of the transport roll 22 by applying a force to the inner surface of the transport unit. In this modification, such an aspect will be described.

  FIG. 6 is a diagram illustrating the force acting on the transport unit 21A according to this modification. In the transport unit 21A according to this modification, the pair of side walls 212A are formed to extend upward (+ z direction). In FIG. 6, the configuration of the transport unit 21A is simplified.

  As shown in FIG. 6, in the transport unit 21A according to this modification, force F3 and force F4 are applied to the inner surface of the side wall 212A of the transport unit 21A. The force F3 is a force having a −x direction component, and the force F4 is a force having a + x direction component.

  As a result of the force F3 and the force F4 being applied to the side wall 212A, the plate 211 of the transport unit 21A is warped upward (in the + z direction) as indicated by an arrow A4. In other words, the plate 211 is warped so as to be convex in the direction of the transport roll 22. As a result, the conveyance roll 214 provided on the plate body 211 is closer to the conveyance roll 22 as compared with the case where the plate body 211 is not warped. As a result, the nip between the conveyance roll 214 and the conveyance roll 22 is obtained. The pressure is applied more than when the plate 211 is not warped.

  FIG. 7 is a diagram illustrating a state where the transport unit 21 </ b> A is mounted in the image forming apparatus 100. FIG. 7 is a cross-sectional view taken along the line II of FIG. 1 when the transport unit 21 and the transport unit 21A according to the above embodiment are replaced.

  As described above, the transport unit 21A shown in FIG. 7 includes a pair of side walls 212A formed so as to extend upward (+ z direction). Unlike the side wall 212 according to the above-described embodiment, the side wall 212A is disposed at a side end portion of the surface (conveying surface) of the plate body 211. Further, unlike the flange 215 according to the above-described embodiment, the transport unit 21A has a pair of flanges 215A provided at end portions in the + z direction of the side walls 212A. Unlike the flange 215 according to the above-described embodiment, the flange 215 </ b> A has a second plate portion 2152 </ b> A that extends upward (+ z direction) from the end portion of the first plate portion 2151. Other configurations of the transport unit 21A are the same as those of the transport unit 21 according to the above-described embodiment.

  The pair of rails 24A shown in FIG. 7 has a groove 241A and an abutting surface 242A. Unlike the groove 241 according to the above-described embodiment, the groove 241A is formed to open downward (−z direction). On the other hand, the abutting surface 242A is different from the abutting surface 242 according to the above embodiment, and the second plate portion 2152A of the flange 215A is inserted into the groove 241A. It is formed in contact with the side. The configuration of the other rail 24A is the same as that of the rail 24 according to the above embodiment.

  A distance D2 from one abutting surface 242A to the other abutting surface 242A is set to be longer than a length L2 in the width direction of the transport unit 21A. Here, the length L2 in the width direction of the transport unit 21A is the length from the inner surface of one second plate portion 2152A to the inner surface of the other second plate portion 2152A. Therefore, the inner surface of the second plate portion 2152A of the transport unit 21A is pressed outward by the abutting surface 242A during and after the transport unit 21A is mounted. As a result, force F3 and force F4 are applied to the inner surface of the side wall 212A of the transport unit 21A.

(2-2) Modification 2
In the above embodiment, the plate body 211 is warped in the direction of the transport roll 22 by applying a force to the side surface in the width direction of the transport unit 21. However, the plate 211 may be warped so as to be convex in the direction of the transport roll 22 by applying a force to the side surface in the longitudinal direction (transport direction) of the transport unit. In this modification, such an aspect will be described.

  FIG. 8 is a diagram illustrating the force acting on the transport unit 21B according to this modification. In the transport unit 21B according to this modification, a front wall 218 and a rear wall 219 are provided. The front wall 218 and the rear wall 219 are disposed perpendicular to the longitudinal direction (y direction), for example. In FIG. 8, the configuration of the transport unit 21B is illustrated in a simplified manner.

  As shown in FIG. 8, in the transport unit 21B according to this modification, forces F5 and F6 are applied to the outer surfaces of the front wall 218 and the rear wall 219 of the transport unit 21B. The force F5 is a force having a −y direction component, and the force F6 is a force having a + y direction component.

  As a result of the force F5 and the force F6 being applied to the front wall 218 and the rear wall 219, the plate body 211 of the transport unit 21B warps upward (in the + z direction) as indicated by an arrow A5. In other words, the plate 211 is warped so as to be convex in the direction of the transport roll 22. As a result, the conveyance roll 214 provided on the plate body 211 is closer to the conveyance roll 22 as compared with the case where the plate body 211 is not warped. As a result, the nip between the conveyance roll 214 and the conveyance roll 22 is obtained. The pressure is applied more than when the plate 211 is not warped.

  FIG. 9 is a schematic diagram illustrating a side surface of an example of the transport unit 21B. In the transport unit 21B shown in FIG. 9, unlike the transport unit 21 according to the above embodiment, a front wall 218 is provided. The front wall 218 is formed to extend perpendicularly to the plate body 211 at the front end portion (the end portion in the + y direction) of the back surface (the surface in the −z direction) of the plate body 211. The angle at which the side wall 212 extends is not necessarily vertical.

  Moreover, in the conveyance unit 21B shown in FIG. 9, unlike the conveyance unit 21 according to the above-described embodiment, a pair of side walls 212B is provided. Unlike the side wall 212 according to the above-described embodiment, the pair of side walls 212B has a part of the length in the z direction that is short. Specifically, the length in the z direction from the front end (end in the + y direction) to the rear portion where the latch 216 is provided is shorter than the length in the z direction of the rear portion. This is for making the plate 211 more easily warped. Further, in the transport unit 21B shown in FIG. 9, unlike the transport unit 21 according to the above-described embodiment, the flange 215 and the rib 217 are not provided. The structure of the other conveyance unit 21B is the same as the conveyance unit 21 which concerns on said embodiment.

  In the transport unit 21 </ b> B, the length L <b> 3 from the outer surface of the front wall 218 to the latch 216 is the above-described protrusion that comes into contact with the latch 216 from the abutting surface in contact with the front wall 218 in the housing of the image forming apparatus 100. It is set to be longer than the distance D3 to the part. As a result, in the transport unit 21B attached to the image forming apparatus 100, the outer surface of the front wall 218 is pressed inward by the abutting surface in a state where movement in the −y direction is restricted. That is, the force F5 shown in FIG. 8 is applied to the front wall 218. As a result, the plate body 211 of the transport unit 21 </ b> B warps so as to be convex in the direction of the transport roll 22.

  In the example of the transport unit 21B shown in FIG. 9, a force is applied only to the front wall 218, but a rear wall 219 is also provided to apply a force to the rear wall 219. Also good. In this case, the latch 216 may not be provided.

(2-3) Modification 3
In the above embodiment, only the transport unit 21 is configured to be detachable from the image forming apparatus 100, but the sheet feeding device 2 itself is also configured to be detachable from the image forming apparatus 100. May be. In this case, the paper feeding device 2 includes, for example, a transport unit 21, a transport roll 22, a manual paper feed tray 23, and a housing 26. The housing 26 accommodates the transport unit 21 and the transport roll 22. The housing 26 accommodates the rail 24.

(2-4) Modification 4
In the above embodiment, the outer surface of the side wall 212 is pressed through the flange 215. However, the outer surface of the side wall 212 may be pressed directly by the abutment surface 242 without providing the flange 215. Good.

(2-5) Modification 5
The image forming apparatus 100 according to the above embodiment is not limited to a printer, and may be a copying machine. Further, it may be a printer having a copying function and a facsimile function.

DESCRIPTION OF SYMBOLS 1 ... Container, 2 ... Paper feeder, 3 ... Development part, 4 ... Transfer part, 5 ... Fixing part, 6 ... Pickup roll, 7 ... Conveyance roll pair, 21 ... Conveyance unit, 22 ... Conveyance roll, 23 ... Manual feed Paper plate, 24 ... rail, 25 ... rotating shaft, 26 ... housing, 31 ... photosensitive drum, 32 ... charger, 33 ... exposure device, 34 ... developing device, 35 ... primary transfer roll, 41 ... intermediate transfer belt, 42 ... secondary transfer roll, 43 ... belt conveyance roll, 44 ... backup roll, 100 ... image forming apparatus, 211 ... plate body, 212 ... side wall, 213 ... movable wall, 214 ... conveyance roll, 215 ... flange, 216 ... latch 217 ... rib 218 ... front wall 219 ... rear wall 241 ... groove 242 ... abutting surface 2151 ... first plate part 2152 ... second plate part

Claims (5)

A plate member that forms a conveyance path for conveying a recording medium; a pair of wall portions that are arranged to face each other at a side end portion of the plate member; and a first member that is rotatably arranged on the plate member. A transport unit having a roll;
A housing to which the transport unit is detachably attached;
A second roll that is provided in the casing and forms a roll pair with the first roll to convey a recording medium on the plate;
Wherein a pressing member that is provided in the housing, presses the other side surface at one state movement is restricted in each side or to press the pair of wall portions of the pair of wall portions, And a pressing member that warps the plate so as to be convex in the direction of the second roll.   The sheet feeding device according to claim 1, wherein the pressing member is a member that guides the transport unit to a predetermined position in the housing when the transport unit is mounted in the housing. apparatus.   The sheet feeding device according to claim 2, wherein each of the pair of wall portions has a flange, and at least one side surface of the pair of wall portions is pressed by the pressing member via the flange. . The pressing member has a groove;
The sheet feeding device according to claim 3, wherein an end of the flange slides in the groove when the transport unit is mounted in the housing. A sheet feeding device according to any one of claims 1 to 4,
An image forming apparatus comprising: an image forming unit that forms an image on a recording medium fed by the paper feeding device.

Images