Sheet storage device and image forming device

Abstract

To store tab sheets small in size without reducing the number of loadable sheets.SOLUTION: A sheet storage device 61 comprises: a tab sheet attachment unit 114 provided with a fixed member 1141 fixed to a sheet loading member 111 to rise / fall integrally with the sheet loading member 111 and abuttable against the upstream end of a sheet S, a movable member 1142 provided to be movable, with respect to the fixed member 1141, in the rising / falling direction of the fixed member 1141 and abuttable against the upstream end of the sheet S, and a pressing spring 1143 for pressing the movable member 1142 in the rising direction of the fixed member 1141; and hooks 1122a and 1122b for limiting movement of the movable member 1142 in the rising direction when the sheet loading member 111 rotates in the rising direction.SELECTED DRAWING: Figure 8

Description

[Technical field]

[0001] The present invention relates to a sheet storage device that stores sheets, and an image forming apparatus, such as a copying machine, a printer, a fax machine, or a multifunction machine having a plurality of these functions, that is equipped with the sheet storage device. [Background technology]

[0002] Conventionally, a sheet storage device for storing sheets generally uses a sheet feed cassette, which is a sheet stacking means capable of storing a plurality of different sizes of sheets. In such a sheet feed cassette, a sheet guide is provided movably as a regulating member that regulates the position of the sheet according to the size of the stored sheet and enables the size of the sheet to be detected. Known examples of such sheet guides include side guides that regulate the sheet from both sides in the width direction perpendicular to the sheet feeding direction, and a rear end guide that regulates the position of the rear end of the sheet in the sheet feeding direction from the upstream side in the sheet feeding direction.

[0003] Among the sheets stored in the paper feed cassette, there is a type called tab paper, which is not a simple rectangular shape. Tab paper is a sheet on which a tab is provided at the edge of the sheet for writing a heading or the like for the purpose of classifying documents, etc. Furthermore, the positions of the tabs provided on the tab paper are not constant, but are offset from one another so that the heading or the like written on the tabs can be easily checked. Therefore, in order to stably regulate the trailing end of the tab paper in the feeding direction, it is necessary to provide a regulating surface across the entire width of the sheet.

[0004] Patent Document 1 discloses a sheet storage device that uses an adapter for tab paper to store tab paper. The sheet storage device of Patent Document 1 includes a rotatable sheet stacking plate on which sheets are stacked, and a spring for pushing up the sheet stacking plate. The sheet storage device of Patent Document 1 also has an adapter with a tab paper trailing end guide provided over substantially the entire width of A4 and letter sizes attached to the sheet stacking member, so that the trailing end of A4 and letter size tab paper can be regulated regardless of where the tab is located on the tab paper. This allows the sheet storage device of Patent Document 1 to store multiple tab papers with their trailing ends aligned. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2001-213529 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, in Patent Document 1, only A4 and letter size tab paper is considered, and there is a problem that it cannot accommodate tab paper of a size smaller than A5. For example, if an adapter is used in which the tab paper rear end guide of an adapter for A4 size tab paper is moved to the rear end position of A5 size tab paper, the number of A5 size tab papers that can be loaded is limited to about half the number of A4 size tab papers that can be loaded.

[0007] Specifically, when A4 size tab paper is set on the sheet stacking member with the adapter attached, when the sheet stacking member rotates and is lifted up, the rear end of the A4 size tab paper moves little in the height direction because it is close to the rotation center of the sheet stacking member. Therefore, in this case, even if the sheet stacking member is lifted up to its maximum height, the adapter does not protrude from the top end of the paper feed cassette.

[0008] On the other hand, when A5 size tab paper is set on the sheet stacking member to which the adapter is attached, when the sheet stacking member rotates and is lifted up, the rear end position of the A5 size tab paper is far from the center of rotation, so the amount of movement in the height direction is large. Therefore, in this case, when the sheet stacking member is lifted up to the maximum height, the adapter protrudes from the top end of the paper feed cassette. In order to prevent the adapter from protruding from the top end of the paper feed cassette when it is lifted up to the maximum height, it is necessary to limit the height of the adapter. This reduces the number of A5 size tab paper that can be loaded.

[0009] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a sheet storage device and an image forming apparatus capable of storing small-sized tab sheets without reducing the number of sheets that can be stacked. [Means for solving the problem]

[0010] The sheet storage device of the present invention is a sheet storage device for storing sheets, and comprises a stacking member on which sheets are loaded and which rises and falls by rotating around the upstream side of the sheet feeding direction as a rotation center, and a first regulating member which is attached to the stacking member and regulates the position of the upstream end of the sheets, the first regulating member comprising: a fixed member which is fixed to the stacking member and rises and falls together with the stacking member and is capable of abutting the upstream end of the sheets, a movable member which is attached to the fixed member and is movable in the lifting and lowering direction of the fixed member relative to the fixed member and is capable of abutting the upstream end of the sheets, and a biasing member which biases the movable member in the lifting direction of the fixed member, and the sheet storage device is characterized in that it has a movement limiting section which limits the movement of the movable member in the lifting direction when the stacking member rotates in the lifting direction. Effect of the Invention

[0011] According to the present invention, small size tab sheets can be stored without reducing the number of sheets that can be stacked. [Brief description of the drawings]

[0012] [Figure 1] 1 is a schematic diagram of an image forming apparatus according to an embodiment of the present invention; [Diagram 2] 1 is a perspective view of a sheet storage device according to an embodiment of the present invention in a state where a tab sheet attachment unit is not attached; [Diagram 3] 1 is a perspective view of a state in which an attachment unit for tab sheets is attached to a sheet storage device according to an embodiment of the present invention; [Figure 4] 2 is a perspective view of an attachment unit for tab sheets of the sheet storage device according to the embodiment of the present invention; FIG. [Diagram 5] 4 is a cross-sectional view of an attachment unit for tab sheets of the sheet storage device according to the embodiment of the present invention. FIG. [Figure 6] 2 is a perspective view of the sheet storage device according to the embodiment of the present invention, in a state where a sheet stacking member is lifted up. FIG. [Figure 7] 11 is a schematic diagram showing a positional relationship between a side guide and a protruding portion of a movable member in a state in which a sheet stacking member of the sheet storage device according to the embodiment of the present invention is not lifted up; FIG. [Figure 8] 11 is a schematic diagram showing a positional relationship between a side guide and a protruding portion of a movable member in a state in which a sheet stacking member of the sheet storage device according to the embodiment of the present invention is lifted up; FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, the embodiments will be described in detail with reference to the drawings.

[0014] <Configuration of Image Forming Apparatus> The configuration of an image forming apparatus 10 according to an embodiment of the present invention will be described in detail with reference to FIG.

[0015] The image forming apparatus 10 includes image forming units 1Y, 1M, 1C, and 1K, a manual paper feed door 2, a fixing device 5, scanner units 13Y, 13M, 13C, and 13K, a reader unit 21, and an intermediate transfer body 31. The image forming apparatus 10 also includes primary transfer units 35Y, 35M, 35C, and 35K, a pair of registration rollers 40, a secondary transfer unit 41, an outlet 50, and a switching unit 51. The image forming apparatus 10 also includes a sheet storage unit 61, a sheet storage unit 62, a sheet storage unit 63, a sheet storage unit 64, a paper feed roller 70, a paper feed roller 71, a paper feed roller 72, a paper feed roller 73, and a paper feed roller 74.

[0016] The image forming units 1Y, 1M, 1C, and 1K are provided below the reader unit 21 of the device body 100 of the image forming apparatus 10, and form images based on image information input from the scanner units 13Y, 13M, 13C, and 13K. The image forming units 1Y, 1M, 1C, and 1K include photosensitive drums 11Y, 11M, 11C, and 11K, chargers 12Y, 12M, 12C, and 12K, developing units 14Y, 14M, 14C, and 14K, and drum cleaning members 15Y, 15M, 15C, and 15K.

[0017] The photosensitive drums 11Y, 11M, 11C, and 11K are rotated by motors (not shown).

[0018] The chargers 12Y, 12M, 12C, and 12K uniformly charge the surfaces of the photosensitive drums 11Y, 11M, 11C, and 11K.

[0019] The developing devices 14Y, 14M, 14C, and 14K supply toner to the electrostatic latent images formed on the photosensitive drums 11Y, 11M, 11C, and 11K by the scanner units 13Y, 13M, 13C, and 13K to form toner images on the photosensitive drums 11Y, 11M, 11C, and 11K.

[0020] The drum cleaning members 15Y, 15M, 15C and 15K remove residual toner remaining on the surfaces of the photosensitive drums 11Y, 11M, 11C and 11K after transfer from the surfaces of the photosensitive drums 11Y, 11M, 11C and 11K.

[0021] The manual feed door 2 is provided so as to be freely opened and closed with respect to the apparatus body 100, and when in the open state serves as a manual feed tray into which the sheet S can be manually set.

[0022] The fixing device 5 fixes the toner image onto the sheet S by applying heat and pressure to the toner image transferred onto the sheet S transported by the secondary transfer unit 41. The fixing device 5 transports the sheet S onto which the toner image has been fixed, toward the discharge port 50.

[0023] The scanner units 13Y, 13M, 13C, and 13K photoelectrically convert the image information input from the reader unit 21. The scanner units 13Y, 13M, 13C, and 13K form electrostatic latent images on the photosensitive drums 11Y, 11M, 11C, and 11K charged by the chargers 12Y, 12M, 12C, and 12K, based on the photoelectrically converted image information.

[0024] The reader unit 21 is provided on the upper part of the device body 100 and includes a scanning optical system for reading an image of a document. The reader unit 21 reads an image of a document by the scanning optical system, and outputs image information of the read image to the scanner units 13Y, 13M, 13C, and 13K.

[0025] The intermediate transfer body 31 conveys the toner images transferred by the primary transfer sections 35Y, 35M, 35C, and 35K to a secondary transfer section 41.

[0026] The primary transfer portions 35Y, 35M, 35C, and 35K transfer the toner images formed on the photosensitive drums 11Y, 11M, 11C, and 11K onto the intermediate transfer body 31.

[0027] The pair of registration rollers 40 transports the sheet S fed by the feed roller 70, the feed roller 71, the feed roller 72, or the feed roller 73 to the secondary transfer unit 41 in accordance with the transport timing of the toner image transferred to the intermediate transfer body 31.

[0028] The secondary transfer section 41 transfers the toner image transferred onto the intermediate transfer body 31 onto the sheet S being conveyed by the registration roller pair 40 , and conveys the sheet S onto which the toner image has been transferred towards the fixing device 5 .

[0029] The discharge port 50 discharges the sheet S conveyed by the fixing device 5 to the outside of the apparatus body 100.

[0030] When the single-sided image forming mode is selected, or when the double-sided image forming mode is selected and toner images are fixed on both sides of the sheet S, the switching unit 51 guides the sheet S conveyed by the fixing device 5 to the discharge outlet 50. When the double-sided image forming mode is selected and toner images are fixed on only one side of the sheet S, the switching unit 51 guides the sheet S conveyed by the fixing device 5 to be conveyed to the secondary transfer unit 41 via the reversal path 52 and the double-sided path 85.

[0031] Sheet storage devices 61, 62, 63 and 64 are provided below the apparatus main body 100 and store sheets S. Sheet storage devices 61, 62, 63 and 64 have a front-loading configuration provided on the front side of the apparatus main body 100 so as to be removable from the apparatus main body 100. Here, the sheets S stored in sheet storage devices 61, 62, 63 and 64 are normal rectangular sheets or tab paper. The configurations of sheet storage devices 61, 62, 63 and 64 will be described in detail later.

[0032] The sheet feed roller 70 feeds the sheet S set on the manual feed tray, which is configured when the manual feed door 2 is in an open state, to the pair of registration rollers 40 .

[0033] The paper feed roller 71 feeds the sheet S stored in the sheet storage device 61 to the pair of registration rollers 40 .

[0034] The paper feed roller 72 feeds the sheet S stored in the sheet storage device 62 to the pair of registration rollers 40 .

[0035] The paper feed roller 73 feeds the sheet S stored in the sheet storage device 63 to the pair of registration rollers 40 .

[0036] The paper feed roller 74 feeds the sheet S stored in the sheet storage device 64 to the pair of registration rollers 40 .

[0037] <Configuration of the sheet storage device> The configurations of sheet storage devices 61, 62, 63, and 64 according to the embodiment of the present invention will be described in detail with reference to Figures 2 and 3. Note that since the configurations of sheet storage devices 61, 62, 63, and 64 are all the same, description and illustration of the configurations of sheet storage devices 62, 63, and 64 will be omitted.

[0038] The sheet storage device 61 has a paper feed tray 110, a sheet stacking member 111, side guides 112a and 112b, a rear end guide 113, and a tab paper attachment unit 114. The sheet storage device 61 also has a hand screw 115, a lifter gear 116, a lifter plate 117, a locking portion 1101, a locking portion 1102, a release lever 1121, and a release lever 1131.

[0039] The paper feed tray 110 stores sheets S therein.

[0040] The sheet stacking member 111 as a stacking member supports the sheets S stored in the paper feed tray 110. The sheets S are stacked on the sheet stacking member 111. The sheet stacking member 111 has a hole 1111 for mounting a tab paper attachment unit 114. The sheet stacking member 111 rotates about a rotation center 1112 on the upstream side of the feeding direction of the sheets S (hereinafter simply referred to as the "feeding direction"), thereby moving up and down in a lifting direction perpendicular to the feeding direction and the width direction perpendicular to the feeding direction. Here, the feeding direction is the direction toward the side guides 112a and 112b as viewed from the rotation center 1112 in FIG. 2.

[0041] Side guide 112a, which serves as a second regulating member, regulates the position of one end in the width direction. Side guide 112a is engaged with engaging portion 1101 and fixed to paper feed tray 110 so as to be movable in the width direction. Side guide 112a has hook portion 1122a, which serves as a movement limiting portion, that comes into contact with protrusion 11422a (described later) of tab paper attachment unit 114.

[0042] Side guide 112b as a second regulating member regulates the position of the other end in the width direction. Side guide 112b is engaged with engaging portion 1101 and fixed to paper feed tray 110 so as to be movable in the width direction. Side guide 112b has hook portion 1122b as a movement limiting portion that abuts against protrusion 11422b (described later) of tab paper attachment unit 114.

[0043] A rear end guide 113 as a third regulating member is engaged with an engaging portion 1102 so as to be movable in the feeding direction so that its position in the feeding direction can be changed, and is supported by the paper feed tray 110. The rear end guide 113 regulates the upstream position in the feeding direction of sheets S other than tab sheets stored in the paper feed tray 110. When the sheets S stored in the paper feed tray 110 are tab sheets, the rear end guide 113 is retracted to the upstream side in the feeding direction.

[0044] Tab paper attachment unit 114, which serves as a first regulating member, is detachably provided on sheet stacking member 111. When sheets S stored in paper feed tray 110 are tab sheets, tab paper attachment unit 114 is attached to sheet stacking member 111 to regulate the position of the upstream end of sheets S in the feeding direction. The portion of tab paper attachment unit 114 that can contact the upstream end of sheets S is longer in the width direction than the portion of rear end guide 113 that can contact the upstream end of sheets S. The configuration of tab paper attachment unit 114 will be described in detail later.

[0045] A hand screw 115 secures the tab paper attachment unit 114 to the sheet stacking member 111 .

[0046] The lifter gear 116 rotates by receiving a driving force from a driving source (not shown) provided in the apparatus main body 100 .

[0047] As the lifter gear 116 rotates, the lifter plate 117 moves together with the rotation of the lifter gear 116 .

[0048] The locking portion 1101 is provided on the paper feed tray 110. The locking portion 1101 locks the side guides 112a and 112b to the paper feed tray 110.

[0049] The release lever 1121 is operated by a user. The release lever 1121 releases the engagement between the engagement portion 1101 and the side guides 112a and 112b, allowing the side guides 112a and 112b to move in the width direction.

[0050] The locking portion 1102 is provided on the paper feed tray 110. The locking portion 1102 locks the rear end guide 113 to the paper feed tray 110.

[0051] The release lever 1131 is operated by a user. The release lever 1131 releases the engagement between the engagement portion 1102 and the rear end guide 113, allowing the rear end guide 113 to move in the feeding direction or in the direction opposite to the feeding direction.

[0052] The sheet storage device 61 having the above configuration is pulled out from the device body 100 when the user replenishes the sheets S. After the sheet storage device 61 is pulled out from the device body 100, the side guides 112a, 112b and the rear end guide 113 are adjusted to predetermined positions according to the size of the sheets S, and the sheets S are set in the paper feed tray 110. Then, the sheet storage device 61 is inserted back into the device body 100.

[0053] <Configuration of the tab paper attachment unit> The configuration of the tab sheet attachment unit 114 of the sheet storage device 61 according to the embodiment of the present invention will be described in detail with reference to FIGS.

[0054] The tab paper attachment unit 114 includes a fixed member 1141 , a movable member 1142 , and a biasing spring 1143 .

[0055] The fixed member 1141 is attached to the sheet stacking member 111 and is capable of moving up and down together with the sheet stacking member 111. The fixed member 1141 includes a boss 11411, a retaining portion 11412, and a trailing end regulating surface 11413.

[0056] The boss 11411 protrudes in the mounting direction of the tab paper attachment unit 114 to the sheet stacking member 111 , and is inserted into a hole 1111 in the sheet stacking member 111 .

[0057] The retaining portions 11412 are provided at both widthwise ends of the fixed member 1141. The retaining portions 11412 are engaged with snap fit portions 11421 (described later) of the movable member 1142 so as to be relatively movable, and hold the movable member 1142 so as not to allow the movable member 1142 to come off the fixed member 1141.

[0058] An end portion on the upstream side in the feeding direction of the sheet S abuts against the rear end regulating surface 11413. When the sheet S is a tab sheet, the rear end regulating surface 11413 abuts against the tab of the tab sheet.

[0059] The movable member 1142 is provided to be movable relative to the fixed member 1141. The movable member 1142 includes a snap fit portion 11421, a protruding portion 11422a, a protruding portion 11422b, and a rear end restriction surface 11423.

[0060] The snap fit portion 11421 movably engages with the retaining portion 11412 of the fixed member 1141 to hold the movable member 1142 to the fixed member 1141 .

[0061] The protruding portion 11422a protrudes outward from one end in the width direction of the movable member 1142. When the movable member 1142 moves upward, the protruding portion 11422a comes into contact with the hook portion 1122a of the side guide 112a to limit the upward movement of the movable member 1142.

[0062] The protruding portion 11422b protrudes outward from the other end in the width direction of the movable member 1142. When the movable member 1142 moves upward, the protruding portion 11422b comes into contact with the hook portion 1122b of the side guide 112b to limit the upward movement of the movable member 1142.

[0063] An end portion on the upstream side in the feeding direction of the sheet S abuts against the rear end regulating surface 11423. When the sheet S is a tab sheet, the rear end regulating surface 11423 abuts against the tab of the tab sheet.

[0064] A biasing spring 1143 as a biasing member is provided between the fixed member 1141 and the movable member 1142. The biasing spring 1143 biases the movable member 1142 in the upward direction of the sheet stacking member 111 when the tab paper attachment unit 114 is attached to the sheet stacking member 111.

[0065] The tab paper attachment unit 114 having the above-mentioned configuration is positioned relative to the sheet stacking member 111 by inserting the positioning boss 11411 of the fixing member 1141 into the hole 1111 of the sheet stacking member 111. The tab paper attachment unit 114 is then attached and fixed to the sheet stacking member 111 by fastening the hand screw 115.

[0066] Furthermore, when the user sets tab paper in the paper feed tray 110, a rear end regulating surface 11413 of the fixed member 1141 and a rear end regulating surface 11423 of the movable member come into contact with the tab portion of the tab paper to regulate the position of the tab paper. Unlike the rear end guide 113, the widthwise length of the rear end regulating surface 11413 and the rear end regulating surface 11423 is approximately the same as the widthwise length of an A5 size sheet S, so that the upstream end of the A5 size tab paper in the feeding direction can be stably regulated.

[0067] <Operation of the sheet storage device> The operations of the sheet storage devices 61, 62, 63, and 64 according to the embodiment of the present invention will be described in detail with reference to Fig. 6 to Fig. 8. Note that since the operations of the sheet storage devices 61, 62, 63, and 64 are all the same, a description of the operations of the sheet storage devices 62, 63, and 64 will be omitted.

[0068] When the sheet stacking member 111 is not lifted up, the protruding portion 11422a is spaced apart from the hook portion 11422a of the side guide 112a, and the protruding portion 11422b is spaced apart from the hook portion 11422b of the side guide 112b.

[0069] The sheet stacking member 111 is lifted up by rotating about a rotation center 1112 as a result of the lifter gear 116 and the lifter plate 117 being driven.

[0070] At this time, since the fixed member 1141 is fixed to the sheet stacking member 111, the fixed member 1141 rises in conjunction with the lift-up of the sheet stacking member 111. On the other hand, when the movable member 1142 rises to a certain extent together with the fixed member 1141, the protruding portion 11422a abuts against the hook portion 1122a and the protruding portion 11422b abuts against the hook portion 1122b, thereby restricting the upward movement.

[0071] As the sheet stacking member 111 rises further, the fixed member 1141 rises while guiding the snap fit portion 11421 with the retaining portion 11412. Also, the movable member 1142 maintains a state in which the protrusion 11422a abuts on the hook portion 1122a and the protrusion 11422b abuts on the hook portion 1122b, thereby restricting the rise of the movable member 1142 from the abutment position. The rise of the movable member 1142 can be restricted by a simple configuration in which the protrusion 11422a abuts on the hook portion 1122a and the protrusion 11422b abuts on the hook portion 1122b.

[0072] Furthermore, when the sheet stacking member 111 descends and the movable member 1142 descends from the contact position, the protrusions 11422a and 11422b are separated from the hooks 1122a and 1122b. This prevents the protrusions 11422a and 11422b from contacting the hooks 1122a and 1122b when the side guides 112a and 112b are moved to supply the sheets S to the paper feed tray 110. Therefore, the side guides 112a and 112b can be easily operated when the sheet stacking member 111 is not lifted up.

[0073] In this way, the tab paper attachment unit 114 expands and contracts in the ascending and descending direction of the sheet stacking member 111 in accordance with the ascending and descending movement of the sheet stacking member 111. This allows the tab paper attachment unit 114 to load the same number of small size tab papers, such as A5 size, as A4 size tab papers.

[0074] In this embodiment, the tab paper attachment unit 114 includes a fixed member 1141 that is fixed to the sheet stacking member 111, moves up and down together with the sheet stacking member 111, and can abut against the upstream end of the sheet S. The tab paper attachment unit 114 also includes a movable member 1142 that is movable relative to the fixed member 1141 in the lifting direction of the fixed member 1141, and can abut against the upstream end of the sheet S. The tab paper attachment unit 114 further includes a biasing spring 1143 that biases the movable member 1142 in the lifting direction of the fixed member 1141.

[0075] In this embodiment, the sheet storage device 61 has hooks 1122a and 1122b that limit the movement of the movable member 1142 in the upward direction when the sheet stacking member 111 rotates in the upward direction. This allows small-sized tab sheets to be stored without reducing the number of sheets that can be stacked.

[0076] In addition, in this embodiment, by providing a hook portion 1122a on the side guide 112a and a hook portion 1122b on the side guide 112b, the position of the sheet S in the width direction can be regulated and the rise of the movable member 1142 can be restricted at the same time.

[0077] The present invention is not limited to the above-described embodiment, and it goes without saying that various modifications are possible without departing from the spirit and scope of the present invention.

[0078] Specifically, in the above embodiment, the lift of the movable member 1142 is restricted by the hook portion 1122a of the side guide 112a and the hook portion 1122b of the side guide 112b. However, the present invention is not limited to this, and the lift of the movable member 1142 may be restricted by a member other than the side guide 112a and the side guide 112b of the sheet storage device 61. For example, the main body of the paper feed tray 110 may be provided with a portion that contacts the movable member 1142 to restrict the lift of the movable member 1142. Also, the device main body 100 of the image forming device 10 may be provided with a portion that contacts the movable member 1142 to restrict the lift of the movable member 1142.

[0079] In the above embodiment, the protrusion 11422a comes into contact with the hook 1122a and the protrusion 11422b comes into contact with the hook 1122b, thereby restricting the lift of the movable member 1142. However, the present invention is not limited to this, and the lift of the movable member 1142 may be restricted by any concave-convex shape or the like provided on the sheet storage device 61.

[0080] In the above embodiment, the tab paper attachment unit 114 is detachably attached to the sheet stacking member 111. However, the present invention is not limited to this. The tab paper attachment unit 114 may be fixed to the sheet stacking member 111 so that it cannot be removed. [Explanation of symbols]

[0081] 1Y Image forming section 1M Image forming section 1C Image forming section 1K image forming section 61 Seat storage device 62 Seat storage device 63 Seat storage device 64 Seat storage device 70 Paper feed roller 71 Paper feed roller 72 Paper feed roller 73 Paper feed roller 74 Paper feed roller 110 Paper feed tray 111 Sheet loading member 112a Side guide 112b Side guide 113 Rear end guide 114 Tab paper attachment unit 1112 Rotation center 1122a Hook 1122b Hook 1141 Fixing member 1142 Movable parts 1143 Spring 11422a Protrusion 11422b Protrusion

Claims

1. A sheet storage device for storing sheets, a stacking member on which sheets are stacked and which moves up and down by rotating about an upstream side in a sheet feeding direction; a first regulating member provided on the stacking member and regulating a position of an upstream end of the sheet; having The first restricting member is a fixed member fixed to the stacking member, raised and lowered together with the stacking member, and capable of abutting against the upstream end of the sheet; a movable member provided movable relative to the fixed member in a lifting and lowering direction of the fixed member, and capable of abutting against the upstream end of the sheet; and a biasing member biasing the movable member in a lifting direction of the fixed member, The sheet storage device includes: a movement limiting portion that limits the movement of the movable member in the upward direction when the loading member rotates in the upward direction; A sheet storage device comprising:

2. The movable member is a protruding portion protruding in a width direction perpendicular to the feeding direction and the lifting direction, The movement limiting portion is abutting the protrusion to limit the movement of the movable member in the upward direction; 2. The sheet storage device according to claim 1, wherein the sheet storage device is a storage unit for storing sheets.

3. The movement limiting portion is When the loading member is lowered from a contact position where the movement limiting portion and the protruding portion contact each other, the loading member is separated from the protruding portion.

3. The sheet storage device according to claim 2, wherein the sheet storage device is a storage unit for storing sheets.

4. a second regulating member that regulates a position of the sheet in a width direction perpendicular to the feeding direction and the lifting direction, The movement limiting portion is The second restricting member is provided with 3. The sheet storage device according to claim 1 or 2.

5. The loading member is The tab paper is loaded as a sheet. The first restricting member is abutting against the tab of the tab sheet to regulate the position of the upstream end of the tab sheet; 3. The sheet storage device according to claim 1 or 2.

6. The first restricting member is Removably attached to the loading member, 3. The sheet storage device according to claim 1 or 2.

7. a third regulating member that abuts against the upstream end of the sheet to regulate the sheet, a portion of the first regulating member that can contact an upstream end of the sheet is longer in a width direction perpendicular to the feeding direction and the lifting direction than a portion of the third regulating member that can contact an upstream end of the sheet; 3. The sheet storage device according to claim 1 or 2.

8. The sheet storage device according to claim 1 or 2, an image forming unit that forms an image on the sheet stored in the sheet storage device; An image forming apparatus comprising:

Images