Sheet storage device

Abstract

To provide a sheet storage device capable of suppressing adjustment of a cassette storage position.SOLUTION: A sheet storage device includes a case, a cassette, a guide mechanism, a cassette body, a cover, and a biasing member. The cassette is moved to a pull-out side in an inserting / removing direction, and gets out of the case. On the contrary, the cassette is moved to an insertion side opposite to the pull-out side in the inserting / removing direction, and is settled in the case. The guide mechanism guides the cassette to a position where the cassette is settled in the case. The cassette body is included in the cassette, and can store a sheet. The cover is included in the cassette, and is arranged on the pull-out side of the cassette body. The cover is relatively movable in the inserting / removing direction with respect to the cassette body. When the cassette is settled in the case, the cover can be brought into contact with the case. The biasing member is included in the cassette, and biases the cover to the insertion side toward the cassette body.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] Embodiments of the present invention relate to a sheet storage device.

Background Art

[0002] The sheet storage device has a cassette. The cassette is housed in an image forming apparatus and supplies sheets to the image forming apparatus. Position adjustment of the cover of the cassette is performed while the cassette is housed in the image forming apparatus. There is a need for a sheet storage device that can suppress position adjustment of the cover.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The problem to be solved by the present invention is to provide a sheet storage device that can suppress position adjustment of the cover.

Means for Solving the Problems

[0005] The sheet storage device of this embodiment comprises a case, a cassette, a guidance mechanism, a cassette body, a cover, and a biasing member. The cassette moves out of the case by moving towards the pull-out side in the insertion / removal direction. Conversely, the cassette moves into the case by moving towards the insertion side in the insertion / removal direction, which is opposite to the pull-out side in the insertion / removal direction. The guidance mechanism guides the cassette to the position where it fits into the case. The cassette body is included in the cassette and is capable of storing a sheet. The cover is included in the cassette and is positioned on the pull-out side of the cassette body in the insertion / removal direction. The cover is relatively movable relative to the cassette body in the insertion / removal direction. The cover can abut against the case when the cassette is seated in the case. The biasing member is included in the cassette and biases the cover toward the insertion side in the insertion / removal direction toward the cassette body. [Brief explanation of the drawing]

[0006] [Figure 1] Schematic diagram of an image forming apparatus. [Figure 2] Perspective view of an image forming apparatus. [Figure 3] A plan view of the sheet storage device in the embodiment. [Figure 4] A side view of a sheet storage device in a modified embodiment. [Figure 5] Side cross-sectional view of the seat storage device. [Figure 6] First operational diagram of the sheet storage device. [Figure 7] Second operational diagram of the seat storage device. [Figure 8] Third operation diagram of the seat storage device. [Figure 9] Fourth operational diagram of the sheet storage device. [Modes for carrying out the invention]

[0007] The sheet storage device of this embodiment will be described below with reference to the drawings. Figure 1 is a schematic diagram of the image forming apparatus 1. For example, the image forming apparatus 1 is placed in a workplace such as an office.

[0008] In this application, the Z, X, and Y directions of the Cartesian coordinate system are defined as follows: The Z direction is the vertical direction, and the +Z side is the upper side. The X and Y directions are the horizontal directions. The X direction is the left-right direction of the image forming apparatus 1. In the X direction, the side approaching the center of the image forming apparatus 1 is sometimes called the inside, and the side moving away from the center of the image forming apparatus 1 is sometimes called the outside. The Y direction is the front-back direction of the image forming apparatus 1. The +Y side is the front side, and the -Y side is the rear side.

[0009] The image forming apparatus 1 performs the process of forming an image on a sheet S. The sheet S may be made of paper. The image forming apparatus 1 includes a case C, a scanner unit 2, an image forming unit 3, a sheet supply unit 4, a transport unit 5, an inversion unit 9, a tray 7, a control panel 8, and a control unit 6.

[0010] Case C is formed by a combination of resin material parts and metal material parts. Case C constitutes the outer shape of the image forming apparatus 1. Case C houses the components of the image forming apparatus 1 inside.

[0011] The scanner unit 2 reads the image information of the object to be copied as brightness and darkness and generates an image signal. The scanner unit 2 outputs the generated image signal to the image forming unit 3. The image forming unit 3 forms a toner image based on an image signal from the scanner unit 2 or an external source. The toner image is an image formed from toner or other materials. The image forming unit 3 transfers the toner image onto the surface of the sheet S. The image forming unit 3 heats and pressurizes the toner image on the surface of the sheet S to fix the toner image to the sheet S.

[0012] The sheet supply unit 4 supplies sheets S one by one to the transport unit 5 in accordance with the timing at which the image forming unit 3 forms the toner image. The sheet supply unit 4 includes a cassette 20 and a pickup roller 11. Cassette 20 houses sheets S of a predetermined size and type. The pickup roller 11 picks up the sheets S one by one from the cassette 20. The pickup roller 11 supplies the picked-up sheet S to the conveyance unit 5.

[0013] The conveyance unit 5 conveys the sheet S supplied from the sheet supply unit 4 to the image forming unit 3. The conveyance unit 5 includes a conveyance roller 12 and a registration roller 13. The conveyance roller 12 conveys the sheet S supplied from the pickup roller 11 to the registration roller 13. The conveyance roller 12 abuts the leading end of the sheet S in the conveyance direction against the nip RN of the registration roller 13. The registration roller 13 aligns the position of the leading end of the sheet S in the conveyance direction by bending the sheet S at the nip RN. The registration roller 13 conveys the sheet S according to the timing when the image forming unit 3 transfers the toner image to the sheet S.

[0014] The image forming unit 3 will be described. The image forming unit 3 includes a plurality of image forming sections F, a laser scanning unit 16, an intermediate transfer belt 17, a transfer section 18, and a fixing device 19. The image forming section F includes a photosensitive drum (photoconductor) D, a charger 14, and a developer 15. The image forming section F forms a toner image corresponding to the image signal on the charged photosensitive drum D. The plurality of image forming sections FY, FM, FC, FK form toner images using yellow, magenta, cyan, and black toners on the photosensitive drums DY, DM, DC, DK, respectively.

[0015] The charger 14 charges the surface of the photosensitive drum D. The developer 15 stores a developer containing yellow, magenta, cyan, and black toners. The developer 15 develops the electrostatic latent image on the photosensitive drum D to form toner images of each color on the photosensitive drum D.

[0016] The laser scanning unit 16 scans the charged photoreceptor drum D with a laser beam L to expose the photoreceptor drum D and form an electrostatic latent image. The laser scanning unit 16 exposes the photoreceptor drums DY, DM, DC, DK of the image forming units FY, FM, FC, FK for each color with separate laser beams LY, LM, LC, LK.

[0017] The toner image on the surface of the photoreceptor drum D is primarily transferred onto the intermediate transfer belt 17. The transfer unit 18 transfers the toner image primarily transferred onto the intermediate transfer belt 17 onto the surface of the sheet S at the secondary transfer position. The fixing device 19 heats and pressurizes the toner image transferred onto the sheet S to fix the toner image onto the sheet S.

[0018] The reversing unit 9 reverses the sheet S to form an image on the back surface of the sheet S. The reversing unit 9 reverses the front and back of the sheet S discharged from the fixing device 19 by means of a switchback. The reversing unit 9 conveys the reversed sheet S toward the registration roller 13. The tray 7 places the sheet S on which an image has been formed and discharged. The control panel 8 is part of an input unit for an operator to input information for operating the image forming apparatus 1. The control panel 8 is also a display unit for displaying information. The control panel 8 has a touch panel and various hard keys. The control unit 6 controls the operations of each part of the image forming apparatus 1.

[0019] Figure 2 is a perspective view of the image forming apparatus 1. The cassette 20 is detachable from the case C of the image forming apparatus 1. The insertion and removal direction is the Y direction, which is the front-back direction of the image forming apparatus 1. The cassette 20 moves to the pulling-out side in the insertion and removal direction and exits from the case C. The pulling-out side is the front side of the image forming apparatus 1, which is the +Y side. The cassette 20 moves to the insertion side in the insertion and removal direction and fits into the case C. The insertion side is the rear side of the image forming apparatus 1, which is the -Y side.

[0020] Cassette 20 is long in the X direction and short in the Z direction. Of the directions perpendicular to the Y direction, the X direction, where the dimensions of cassette 20 are greatest, is the horizontal direction, and the Z direction is the vertical direction. Multiple cassettes 20 are mounted in case C of the image forming apparatus 1. The multiple cassettes 20 are mounted side by side in the Z direction. The widths of the multiple cassettes 20 in the X direction are the same. The +Y side end faces of the multiple cassettes 20 constitute the design surface of the image forming apparatus 1.

[0021] Figure 3 is a plan view of the sheet storage device 10 in an embodiment. Figure 3 shows the state just before the cassette 20 is placed in the case C. The sheet storage device 10 includes the case C, the cassette 20, and the guidance mechanism 23.

[0022] The induction mechanism 23 guides the cassette 20 to a position where it fits into the case C. The induction mechanism 23 includes a pin 24 and a retraction device 25. For example, one side in the X direction is the -X side. The pin 24 is located at the -X and -Y corners of the cassette 20. The pin 24 protrudes from the cassette 20 towards the -X side. The retraction device 25 is located on the outside of the -X side of the cassette 20, near the -Y end of the cassette 20.

[0023] When the user of the image forming apparatus 1 places the cassette 20 into case C, they push the cassette 20 towards the -Y side. When the cassette 20 has moved to near the -Y end of case C, the pin 24 enters the retraction device 25. The retraction device 25 uses the restoring force of a biasing member located inside to retract the pin 24 towards the -Y side. This causes the cassette 20 to fit into case C. The retraction device 25 assists the user in storing the cassette 20. The guidance mechanism 23 guides the cassette 20 to the position where it fits into case C.

[0024] Figure 4 is a side view of the sheet storage device 10 in a modified embodiment. The guide mechanism 23 of the modified embodiment has a roller 26 and a groove 27. The roller 26 is mounted on the cassette 20. The roller 26 is rotatable around a rotation axis parallel to the X direction. The groove 27 is formed on the +Z side surface of the case C and recessed on the -Z side. When the cassette 20 is in the position to fit into the case C, the roller 26 falls into the groove 27. The guide mechanism 23 of the modified embodiment also guides the cassette 20 to the position to fit into the case C.

[0025] As shown in Figure 3, the cassette 20 includes a cassette body 21, a cover 30, a guide portion 31, and a biasing member 35. The cassette body 21 is formed by a combination of resin material parts and metal material parts. The cassette body 21 has a sheet storage section 22 capable of accommodating a sheet S. The sheet storage section 22 opens to the +Z side. The sheet storage section 22 is capable of accommodating a sheet S with its thickness direction substantially aligned with the Z direction.

[0026] The cover 30 is formed separately from the cassette body 21 using a resin material or the like. The cover 30 is positioned on the +Y side of the cassette body 21 and covers the +Y side of the cassette body 21. The cover 30 is movable relative to the cassette body 21 in the Y direction. The X-direction end of the cover 30 protrudes outward from the cassette body 21 in the X direction. When the cassette 20 is placed in the case C, the cover 30 can abut against the case C at its X-direction end. The position of the cover 30 is stabilized by the abutment of both X-direction ends of the cover 30 against the case C.

[0027] The cover 30 has projections 37 at its ends in the X direction. The projections 37 protrude toward the -Y side. The cover 30 can contact the +Y side end of the case C by the -Y side end of the projection 37. The projections 37 are formed from a rigid material such as resin. The projections 37 are formed integrally with the cover 30. The projections 37 may be formed separately from the cover 30 and attached to the cover 30. The projections 37 are positioned at both ends in the Z direction of both ends in the X direction of the cover 30.

[0028] The guide portion 31 guides the relative movement of the cassette body 21 and the cover 30 in the Y direction. The guide portion 31 has an engagement groove 33 and an engagement pin 32. The engagement groove 33 is provided on one of the cassette body 21 and the cover 30, and the engagement pin 32 is provided on the other. In the example of this embodiment, the engagement groove 33 is provided on the cover 30 and the engagement pin 32 is provided on the cassette body 21.

[0029] The engagement groove 33 extends in the Y direction. The engagement groove 33 is formed in the engagement member 34. The engagement groove 33 may also be formed in the cover 30 itself. The engagement groove 33 is an elongated hole that penetrates the engagement member 34 in the Z direction. The engagement groove 33 may also be an elongated groove that is recessed in the Z direction. The engagement member 34 having the engagement groove 33 is formed integrally with the cover 30. The engagement member 34 having the engagement groove 33 may be formed separately from the cover 30 and attached to the cover 30.

[0030] The engaging pin 32 is substantially cylindrical in shape. The engaging pin 32 protrudes from the cassette body 21 in the Z direction. The engaging pin 32 is formed integrally with the cassette body 21. The engaging pin 32 may be formed separately from the cassette body 21 and attached to the cassette body 21. The engaging pin 32 is positioned inside the engaging groove 33.

[0031] A pair of guide portions 31 are positioned spaced apart in the X direction. The pair of guide portions 31 allow the cassette body 21 and the cover 30 to move relative to each other only in the Y direction. The range of relative movement in the Y direction is restricted by the length of the engagement groove 33. The pair of guide portions 31 suppress relative movement of the cassette body 21 and the cover 30 in the X and Z directions. The pair of guide portions 31 suppress tilting of the cover 30 in the Z direction.

[0032] A pair of guide sections 31 are positioned on only one side of the cassette 20 in the Z direction. This allows for smooth relative movement of the cassette body 21 and the cover 30 in the Y direction. Alternatively, a pair of guide sections 31 may be positioned on both sides of the cassette 20 in the Z direction.

[0033] The biasing member 35 is a coil spring or the like. The biasing member 35 biases the cover 30 toward the cassette body 21 in the -Y direction. One biasing member 35 is positioned inside a pair of guide portions 31 in the X direction. Another biasing member 35 is positioned in the center of the cassette 20 in the X and Z directions. This stabilizes the posture of the cover 30 relative to the cassette body 21. Alternatively, multiple biasing members 35 may be positioned symmetrically in the X and Z directions.

[0034] Figure 5 is a side cross-sectional view of the cassette body 21 and cover 30. The cover 30 has a through hole 38. The through hole 38 penetrates the cover 30 in the Y direction. The cassette body 21 has a recess 29 and a pull tab 28. The recess 29 is formed in approximately the same position as the through hole 38 in the X and Z directions. The recess 29 extends from the +Y side end face of the cassette body 21 to the -Y side and further to the +Z side. The pull tab 28 is formed between the portion of the recess 29 that extends to the +Z side and the +Y side end face of the cassette body 21. The pull tab 28 is formed integrally with the cover 30 as part of the cover 30.

[0035] When the user of the image forming apparatus 1 pulls the cassette 20 out of case C, they insert their hand into the through-hole 38 in the cover 30 and the recess 29 in the cassette body 21. The user bends the tips of their fingers toward the +Z side and positions the tips of their fingers toward the -Y side of the pull handle 28. When the user pulls their hand toward the +Y side, a force toward the +Y side is applied from the tips of their fingers toward the pull handle 28. In other words, the user can access the pull handle 28 from the +Y side of the cover 30 through the through-hole 38 and can apply a force toward the +Y side to the pull handle 28. This causes the cassette 20 to be pulled out toward the +Y side. The pull handle may also be a handle that protrudes inward from the cassette body 21 into the through-hole 38.

[0036] The operation of the sheet storage device 10 of this embodiment will be described. In the state shown in Figure 3, the cassette body 21 and the cover 30 are in contact with each other. The projection 37 of the cover 30 is separated from the case C on the +Y side.

[0037] Figure 6 is a diagram illustrating the first operation of the sheet storage device 10. The cassette 20 is pulled in to the -Y side by the retraction device 25 (see Figure 3), transitioning to the state shown in Figure 6. In the state shown in Figure 6, the projection 37 of the cover 30 is in contact with the case C. The cassette body 21 is biased to the +Y side by the biasing member 35. The biasing force of the biasing member 35 is less than the retraction force of the retraction device 25. The retraction device 25 pulls the cassette body 21 to the -Y side against the biasing force of the biasing member 35. As a result, the cassette body 21 is pulled in to a storage position away from the cover 30 on the -Y side.

[0038] The cover 30 is biased to the -Y side by the biasing member 35. Therefore, even if the storage position of the cassette body 21 varies, the cover 30 will be positioned in the predetermined position shown in Figure 6.

[0039] The image forming apparatus 1 shown in Figure 2 has multiple cassettes 20. The covers 30 of the multiple cassettes 20 are all positioned in predetermined locations. The covers 30 have vertical lines VL at both ends in the X direction. The vertical lines VL are straight lines parallel to the Z direction. The multiple cassettes 20 are arranged in a line in the Z direction. The vertical lines VL of the covers 30 of the multiple cassettes 20 are aligned in a straight line. This suppresses deterioration of the appearance of the image forming apparatus 1.

[0040] As detailed above, the sheet storage device 10 of the embodiment includes a case C, a cassette 20, a guidance mechanism 23, a cassette body 21, a cover 30, and a biasing member 35. The cassette 20 moves to the +Y side and exits the case C. On the other hand, the cassette 20 moves to the -Y side, which is opposite to the +Y side, and fits into the case C. The guidance mechanism 23 guides the cassette 20 to the position where it fits into the case C. The cassette body 21 is included in the cassette 20 and is capable of storing sheets. The cover 30 is included in the cassette 20 and is positioned on the +Y side of the cassette body 21. The cover 30 is movable relative to the cassette body 21 in the Y direction. The cover 30 can abut against the case C when the cassette 20 fits into the case C. The biasing member 35 is included in the cassette 20 and biases the cover 30 toward the cassette body 21 to the -Y side.

[0041] Because the induction mechanism 23 is composed of multiple parts, the storage position of the cassette body 21 varies. In particular, because the retraction device 25 is composed of many parts, the variation in the storage position of the cassette body 21 becomes significant. In addition, because the cassette body 21 is composed of many parts, the position of the cover 30, which is located on the +Y side of the cassette body 21, varies. In contrast, in this embodiment, the cover 30 is positioned in a predetermined position, so deterioration of appearance is suppressed. Therefore, the positional adjustment (alignment) of the cover 30 can be suppressed.

[0042] Figure 7 is a diagram illustrating the second operation of the sheet storage device 10, Figure 8 is a diagram illustrating the third operation, and Figure 9 is a diagram illustrating the fourth operation. Figures 7-9 exaggerate the operation of the cassette body 21 and cover 30 of the cassette 20.

[0043] The pull-in device 25 (see Figure 3) is located only on the -X side of the cassette 20 and pulls the cassette 20 to the -Y side. As shown in Figure 7, the -X side of the cassette 20 is pulled to the -Y side before the +X side. The projection 37 on the -X side of the cover 30 contacts the case C before the projection 37 on the +X side.

[0044] From the state shown in Figure 7, the cassette 20 is pulled further towards the -Y side. As shown in Figure 8, the cover 30 rotates using the projection 37 on the -X side as a pivot point. The projection 37 on the +X side of the cover 30 comes into contact with the case C, and the cover 30 is positioned in its predetermined location. At this time, the -X side of the cassette body 21 moves away from the cover 30 towards the -Y side. The cassette body 21 rotates using its +X end as a pivot point.

[0045] From the state shown in Figure 8, the cassette 20 is pulled further towards the -Y side. As shown in Figure 9, the cover 30 remains in place, and the cassette body 21 is pulled into storage position. At this time, the +X side of the cassette body 21 moves away from the cover 30 towards the -Y side. Of the pair of guide parts 31, the guide part 31 located on the -X side is designated as the first guide part 31a, and the guide part 31 located on the +X side is designated as the second guide part 31b. The cassette body 21 rotates around the engagement pin 32 of the first guide part 31a.

[0046] The engagement dimension difference is defined as the difference in the X-direction between the engagement groove 33 and the engagement pin 32 in the guide portion 31. That is, the engagement dimension difference is the difference between the width of the engagement groove 33 in the X-direction and the diameter of the engagement pin 32. Preferably, the engagement dimension difference of the first guide portion 31a is smaller than the engagement dimension difference of the second guide portion 31b. From Figure 8 to Figure 9, the cassette body 21 rotates around the engagement pin 32 of the first guide portion 31a. Because the engagement dimension difference of the first guide portion 31a is small, the rotation center of the cassette body 21 does not wobble, and rattling during rotation of the cassette body 21 is suppressed. Because the engagement dimension difference of the second guide portion 31b is large, the cassette body 21 rotates smoothly. As a result, even if the retraction device 25 is positioned only on the -X side of the cassette 20, the cassette 20 is smoothly retracted to the storage position.

[0047] The engagement groove 33 of the second guide portion 31b may be an arc shape centered on the engagement pin 32 of the first guide portion 31a, instead of being a straight line parallel to the Y direction. Even in this case, the cassette body 21 can rotate smoothly around the engagement pin 32 of the first guide portion 31a.

[0048] (Note 1) The case and, A cassette moves out of the case by moving towards the pull-out side in the insertion / removal direction, while moving towards the insertion side in the insertion / removal direction, which is opposite to the pull-out side in the insertion / removal direction, and fits back into the case. A guidance mechanism for guiding the cassette to a position where it fits into the case, The cassette includes a cassette body capable of housing a sheet, A cover included in the cassette, positioned on the pull-out side of the cassette body in the insertion / removal direction, movable relative to the cassette body in the insertion / removal direction, and capable of contacting the case when the cassette is placed in the case, The cassette includes a biasing member that biases the cover toward the cassette body toward the insertion side in the insertion / removal direction, Seat storage device. (Note 2) The induction mechanism has a pull-in device that pulls the cassette towards the insertion side in the insertion / removal direction. The sheet storage device described in Appendix 1. (Note 3) The biasing force of the biasing member is less than the retraction force of the retraction device. The seat storage device described in Appendix 2. (Note 4) The cassette includes a guide portion that guides the relative movement of the cassette body and the cover in the insertion / removal direction, The aforementioned guide portion is An engagement groove extending in the insertion / removal direction is provided on one of the cassette body and the cover, The cassette body and the cover are provided with an engagement pin, which is positioned inside the engagement groove, The sheet storage device described in Appendix 1. (Note 5) The cassette body and the cover are movable relative to each other only in the insertion / removal direction. The seat storage device described in Appendix 4. (Note 6) When the direction perpendicular to the insertion / removal direction, and the direction in which the dimensions of the cassette are greatest, is defined as the lateral direction, The pair of guide portions are arranged to be spaced apart in the lateral direction. The seat storage device described in Appendix 4. (Note 7) One biasing member is positioned inside the pair of guide portions in the lateral direction. The seat storage device described in Appendix 6. (Note 8) The retraction device is positioned on one side of the cassette in the lateral direction. The difference in lateral dimensions between the engagement groove and the engagement pin in the guide portion is defined as the engagement dimension difference. When, of the pair of guide portions, the guide portion located on one side in the lateral direction is designated as the first guide portion, and the guide portion located on the other side in the lateral direction, opposite to the one side in the lateral direction, is designated as the second guide portion, The difference in engagement dimensions of the first guide portion is smaller than the difference in engagement dimensions of the second guide portion. The seat storage device described in Appendix 6. (Note 9) The cassette body is accessible from the pull-out side of the cover in the insertion / removal direction, and has a pull-out portion that allows force to be applied to the pull-out side in the insertion / removal direction. The sheet storage device described in Appendix 1. (Note 10) When the direction perpendicular to the insertion / removal direction, and the direction in which the dimensions of the cassette are greatest, is defined as the lateral direction, The cover is capable of contacting the case at the tip of a projection located at the lateral end. The sheet storage device described in Appendix 1.

[0049] According to at least one embodiment described above, the cassette body 21, the cover 30, and the biasing member 35 are included. This makes it possible to suppress adjustment of the storage position of the cassette 20.

[0050] While several embodiments of the present invention have been described, these embodiments are presented as examples only and are not intended to limit the scope of the invention. These embodiments can be carried out in a variety of other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims and their equivalents. [Explanation of Symbols]

[0051] C...Case, 10...Sheet storage device, 20...Cassette, 21...Cassette body, 23...Induction mechanism, 25...Retraction device, 30...Cover, 31...Guide part, 31a...First guide part, 31b...Second guide part, 32...Engaging pin, 33...Engaging groove, 35...Biasing member, 37...Protrusion.

Claims

1. The case and, A cassette moves out of the case by moving towards the pull-out side in the insertion / removal direction, while moving towards the insertion side in the insertion / removal direction, which is opposite to the pull-out side in the insertion / removal direction, and fits back into the case. A guidance mechanism for guiding the cassette to a position where it fits into the case, The cassette includes a cassette body capable of housing a sheet, A cover included in the cassette, positioned on the pull-out side of the cassette body in the insertion / removal direction, movable relative to the cassette body in the insertion / removal direction, and capable of contacting the case when the cassette is placed in the case, The cassette includes a biasing member that biases the cover toward the cassette body toward the insertion side in the insertion / removal direction, Seat storage device.

2. The induction mechanism has a pull-in device that pulls the cassette towards the insertion side in the insertion / removal direction. The sheet storage device according to claim 1.

3. The biasing force of the biasing member is less than the retraction force of the retraction device. The sheet storage device according to claim 2.

4. The cassette includes a guide portion that guides the relative movement of the cassette body and the cover in the insertion / removal direction, The aforementioned guide portion is An engagement groove extending in the insertion / removal direction is provided on one of the cassette body and the cover, The cassette body and the cover are provided with an engagement pin, which is positioned inside the engagement groove, The sheet storage device according to claim 1.

5. The cassette body and the cover are movable relative to each other only in the insertion / removal direction. The sheet storage device according to claim 4.

Images