JP2023139956A - Sheet storage device and image formation device - Google Patents

Abstract

To provide a sheet storage device that, despite simple constitution adaptive to downsizing, allows a user to move a slider which regulates a rear end of a sheet only by moving a pair of cursors regulating both ends of the sheet in an interlocking manner.SOLUTION: A sheet feeder 10 has a first pinion gear 26 and a second pinion gear 27 which are supported on the same axis, and rotates the first pinion gear 26 and second pinion gear 27 as respective widthwise rack gears 24 and respective cursors 22 move to pass each other so as to move, in an interlocking manner, a longitudinal rack gear 25 and a slider 23 in a longitudinal direction, with the respective widthwise rack gears 24 being provided with cut-off parts 24A (or 24B) each formed through cutting-off in a portion where the teeth thereof mesh with the first pinion gear 26.SELECTED DRAWING: Figure 4

Description

The present invention relates to a paper accommodating device that stacks and accommodates a plurality of sheets of paper, and an image forming apparatus equipped with the same, and particularly relates to a technique for aligning the edges of each sheet of paper accommodated in the paper accommodating device.

2. Description of the Related Art An image forming apparatus forms an image on recording paper (paper), and includes a paper storage device in which a plurality of recording papers are stacked and stored, and the recording paper is supplied from this paper storage device. For example, as shown in FIGS. 9A, 9B, and 9C, the paper storage device 101 includes a tray 102 on which a plurality of recording sheets are stacked and stored. This tray 102 is provided with a pair of cursors 103 that are movable in the width direction of the recording sheets and that come into contact with both ends of the plurality of recording sheets stacked on the tray 102 to align both ends of each recording sheet. , a slider 104 is provided so as to be movable in the longitudinal direction of the recording sheets, and is brought into contact with the rear ends of the plurality of recording sheets stacked on the tray 102 to align the rear ends of the recording sheets. . The paper feed roller 105 is intermittently rotated while being pressed against the uppermost recording paper on the tray 102, and sequentially pulls out and supplies each recording paper on the tray 102.

Here, in the paper storage device 101, each cursor 103 and slider 104 must be operated and moved separately.

On the other hand, the sheet stacking device described in Patent Document 1 includes a cassette housing in which a plurality of recording papers are stacked and accommodated, respective side regulation plates regulating both ends of each recording paper, and regulating the rear end of each recording paper. a trailing edge regulating plate that guides the guide pins of each side regulating plate, and a cam plate that is connected to the trailing edge regulating plate and has respective cam grooves that guide the guide pins of each side regulating plate, and the trailing edge regulating plate When the cam plate is moved, the cam plate is moved to follow the trailing edge regulating plate, and the guide pins of each side regulating plate are guided and moved by each cam groove of the cam plate, so that each side regulating plate is moved according to the width of the recording paper. direction. Thereby, each side regulation plate is moved in conjunction with the movement operation of the rear end regulation plate, and there is no need to separately operate and move each side regulation plate and the rear end regulation plate.

In addition, the sheet stacking cassette described in Patent Document 2 has a sheet storage cassette in which a plurality of recording sheets are stacked and stored, and a sheet storage cassette that is moved in conjunction with each other in directions toward and away from each other to regulate both ends of each recording sheet. It includes a side regulating member and a trailing edge regulating member that regulates the trailing edge of each recording paper, and one side regulating member is extended in the vertical direction of the recording paper to form a fitting groove. is provided with a fitting member that fits into the fitting groove of one side regulating member, and when the trailing edge regulating plate is moved in the vertical direction of the recording paper, the fitting member of the trailing edge regulating member moves to one side. By moving in the fitting groove of the regulating member, one side regulating member is moved in the width direction of the recording paper, and each side regulating member is moved in a direction toward and away from each other. Thereby, each side regulating member is moved in conjunction with the moving operation of the rear end regulating member, and there is no need to separately operate and move each side regulating member and the rear end regulating member.

Japanese Patent Application Publication No. 07-117864 Japanese Patent Application Publication No. 2000-318843

However, Patent Document 1 has a cam plate connected to a rear end regulating plate, and Patent Document 2 has a side regulating member provided with a portion extending in the vertical direction of the recording paper and having a fitting groove formed therein. Both the cam plate and the side regulating member are large in size, and the device main body or cassette main body becomes large.

The present invention has been made in view of the above circumstances, and has a simple structure suitable for miniaturization, but also includes a pair of cursors that regulate both ends of the paper in the width direction, and a pair of cursors that regulate the rear end of the paper in the length direction. The purpose is to move the slider in conjunction with the regulating slider.

A paper storage device according to one aspect of the present invention includes a tray on which paper is stacked, and a paper storage device that is provided movably in the width direction of the paper placed on the tray and that comes into contact with both ends of the paper. a pair of cursors; a slider provided on the tray so as to be movable in the vertical direction perpendicular to the width direction of the paper and abutting the rear end of the paper; a pair of width-direction rack gears that protrude inside the cursor and move in the width direction of the paper together with the cursor; and a pair of width-direction rack gears that are connected to the slider and protrude toward the leading edge of the paper and move in a direction orthogonal to each of the width-direction rack gears. A first device which is sandwiched between the extending longitudinal rack gear and each of the width direction rack gears, meshes with each of the width direction rack gears, and moves each of the width direction rack gears and each of the cursors in a direction passing each other in conjunction with each other. a pinion gear, and a second pinion gear that meshes with the longitudinal rack gear, the first pinion gear and the second pinion gear are supported and fixed by the same shaft, and each of the widthwise rack gears and the The first pinion gear and the second pinion gear are rotated as each cursor moves in a direction that passes each other, and the vertical movement of the vertical rack gear and the slider is interlocked, so that each of the widthwise rack gears A notch portion is provided by cutting out a part of the tooth that meshes with the first pinion gear.

Further, an image forming apparatus according to one aspect of the present invention includes the paper storage device of the present invention, a paper feed roller that pulls out and transports paper from the paper storage device, and a paper feed roller that pulls out and transports the paper from the paper storage device. The apparatus includes an image forming section that records an image on the incoming paper.

According to the present invention, although the configuration is simple and suitable for miniaturization, a pair of cursors that regulate both ends of the paper in the width direction and a slider that regulates the trailing edge of the paper in the length direction are moved in conjunction with each other. can be done.

1 is a perspective view showing the appearance of an image forming apparatus including a paper feed cassette to which a paper storage device according to an embodiment of the present invention is applied. FIG. 2 is a plan view showing a paper feed cassette to which the paper storage device of the present embodiment is applied. FIG. 2 is a plan view showing the paper storage device of this embodiment. FIG. 2 is an enlarged plan view of a part of the paper storage device. FIG. 3 is an enlarged perspective view showing a first pinion gear and a second pinion gear in the paper storage device. This is a chart Z showing the vertical length, the horizontal length, and the ratio of the vertical and horizontal lengths of the standard size for each type of standard size. (A) and (C) are diagrams showing the movement of each cursor and slider, and (B), (D), and (E) are diagrams showing each widthwise rack gear, vertical rack gear, first pinion gear, and second pinion. It is a figure showing operation of a gear. (A) and (C) are diagrams showing the movement of each cursor and slider, and (B) is a diagram showing the operation of each widthwise rack gear, vertical rack gear, first pinion gear, and second pinion gear. . (A) is a plan view showing a conventional paper storage device, (B) is a plan view showing a slider of the conventional paper storage device, and (C) is a plan view showing each cursor of the conventional paper storage device. It is.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing the appearance of an image forming apparatus including a paper feed cassette to which a paper storage device according to an embodiment of the present invention is applied. As shown in FIG. 1, the image forming apparatus 1 is a printer, and the apparatus main body 2 is provided with a plurality of component devices for realizing various functions of the image forming apparatus 1. For example, the apparatus main body 2 is provided with an operation section 3, a paper feed cassette 4, a discharge tray 6, etc., and an image forming section and a fixing device are provided inside the apparatus main body 2.

The image forming section forms an image represented by the image data on recording paper fed from the paper feed cassette 4 using an electrophotographic method using toner. The recording paper on which the image has been formed is ejected to the ejection tray 6 after being subjected to a fixing process by the fixing device.

The operation unit 3 includes, for example, a start key, a decision key for confirming operation input, a numerical input key for inputting numerical values, and receives instructions from the operator regarding various operations and processes. The operation unit 3 is also provided with a display unit that displays operation guidance for the operator.

FIG. 2 is a plan view showing a paper feed cassette to which the paper storage device of this embodiment is applied. Further, FIG. 3 is a plan view showing the paper storage device of this embodiment, and FIG. 4 is a plan view showing a part of the paper storage device in an enlarged manner.

The paper storage device 10 of this embodiment is provided in the main body casing of the paper feed cassette 4. In addition to the paper storage device 10, the main body housing of the paper feed cassette 4 includes a frame 11 disposed on the leading edge side of a plurality of recording sheets K stacked on the tray 21 of the paper storage device 10; A paper feed roller 12 is provided which is supported and sequentially pulls out each recording paper K on the tray 21 and supplies it to the image forming section.

The paper storage device 10 includes a tray 21 on which a plurality of recording papers K are stacked, and a pair of trays provided on the tray 21 so as to be movable in the width direction Y of each recording paper K, and abutting both ends of the recording papers K. a cursor 22, a slider 23 provided on the tray 21 so as to be movable in the longitudinal direction A pair of widthwise rack gears 24 are connected to the slider 23 and protrude inside each cursor 22, and are moved together with each cursor 22 in the width direction Y of each recording paper K. A vertical rack gear 25 that protrudes toward the tip side and extends in a direction perpendicular to each width direction rack gear 24, and a first rack gear 25 that is sandwiched between each width direction rack gear 24 and meshes with each width direction rack gear 24. It includes a pinion gear 26 and a second pinion gear 27 that meshes with the vertical rack gear 25.

Each cursor 22 is movably supported on the tray 21 by a guide rail (not shown) extending in the width direction Y of each recording paper K.

The first pinion gear 26 is meshed with each width direction rack gear 24, and moves each width direction rack gear 24 in a direction passing each other (width direction Y) in conjunction with each other. Each cursor 22 is moved along with each width direction rack gear 24 in a direction passing each other. Each width direction rack gear 24 and each cursor 22 are moved symmetrically about the first pinion gear 26.

The slider 23 is fixed to one end of an elongated frame 28, and a vertical rack gear 25 is formed on one side inside a rectangular opening 28A formed in the elongated frame 28. The elongated frame 28 is movably supported on the tray 21 by guide rails (not shown) extending in the longitudinal direction X of each recording sheet K. The slider 23 is supported so as to be movable in the vertical direction X together with an elongated frame 28.

As shown in FIG. 5, the first pinion gear 26 and the second pinion gear 27 are supported by the same shaft, fixed to each other, and rotate together. The diameter R2 of the second pinion gear 27 is set to be three times the diameter R1 of the first pinion gear 26.

In the paper storage device 10 having such a configuration, each cursor 22 is moved in the width direction Y of each recording paper K (in the direction in which they pass each other) with each recording paper K stacked on the tray 21. At this time, as each cursor 22 moves in the width direction Y, each width direction rack gear 24 connected to each cursor 22 also moves in a direction passing each other, and the The first pinion gear 26 rotates clockwise CW or counterclockwise CCW, and the second pinion gear 27 also rotates together with the first pinion gear 26. Then, as the second pinion gear 27 rotates, the vertical rack gear 25 meshed with the second pinion gear 27 moves in the vertical direction X of each recording paper K, and the vertical rack gear 25 and the elongated frame The slider 23 connected to one end of the slider 28 also moves in the vertical direction X.

When the size of each recording paper K on the tray 21 is large, the cursors 22 are moved in a direction away from each other, the first pinion gear 26 and the second pinion gear 17 are rotated counterclockwise CCW, and the slider 23 is moved in a direction away from the paper feed roller 12. Further, when the size of each recording paper K on the tray 21 is small, the cursors 22 are moved in a direction closer to each other, the first pinion gear 26 and the second pinion gear 17 are rotated in the clockwise direction CW, and the slider 23 is moved in a direction approaching the paper feed roller 12. As a result, regardless of the size of each recording paper K on the tray 21, when each cursor 22 approaches both ends of each recording paper K, the slider 23 approaches the rear end of each recording paper K, and vice versa. When the cursor 22 is moved away from both ends of each recording paper K, the slider 23 is moved away from the rear end of each recording paper K.

FIG. 6 is a chart Z showing the vertical length, horizontal length, and ratio H of the vertical and horizontal lengths of the standard sizes for each standard size (A4, B5, A6, A5). As is clear from this diagram Z, the ratio H of the length and width of the standard size is slightly smaller than 1.5. From this, for example, the vertical movement distance Δx (shown in FIG. 4) of the slider 23 is set to 1.5 times the sum (2×Δy) of the width movement distance Δy (shown in FIG. 4) of each cursor 22. When set, it can be seen that when each cursor 22 approaches both ends of each recording paper K, the slider 23 approaches the rear end of each recording paper K. Further, the approach of the slider 23 to the rear end of each recording paper K is slightly faster than the approach of each cursor 22 to both ends of each recording paper K.

To set the moving distance Δx of the slider 23 in the vertical direction to 1.5 times the sum (2 x Δy) of the moving distance Δy of each cursor 22 in the width direction Y, set the moving distance Δx to 3 times the moving distance Δy. It is also possible to set it to . Therefore, as described above, the diameter R2 of the second pinion gear 27 is set to three times the diameter R1 of the first pinion gear 26, and as each cursor 22 moves in the width direction Y, the first pinion gear 26 becomes When rotated, the second pinion gear 27 rotates once, and the slider 23 moves by three times the movement distance Δy of each cursor 22 (Δx=3×Δy).

However, as is clear from chart Z in FIG. 6, the ratio H of length and width varies among various standard sizes. Therefore, even if the vertical movement distance Δx of the slider 23 is set to three times the movement distance Δy of each cursor 22 in the width direction Y, each recording paper K The timing at which each cursor 22 approaches both ends of the recording paper K and the timing at which the slider 23 approaches the rear end of each recording paper K are shifted.

Therefore, the slider 23 moves by three times the moving distance Δx of each cursor 22, and the slider 23 approaches the rear end of each recording paper K more than the approach of each cursor 22 to both ends of each recording paper K. After setting the speed to be slightly faster, as shown in FIG. ) has been established.

When the slider 23 comes into contact with the rear end of each recording paper K immediately before each cursor 22 comes into contact with both ends of each recording paper K, the first pinion gear 26 moves into the notch of each width direction rack gear 24. 24A (or notch 24B), the first pinion gear 26 and the second pinion gear 27 stop, and the slider 23 stops. In this state, even if each cursor 22 is further moved and comes into contact with both ends of each recording paper K, the first pinion gear 26 and the second pinion gear 27 do not rotate, and the slider 23 remains stopped. This makes it possible to bring the slider 23 into contact with the rear end of each recording paper K by simply performing an operation to bring each cursor 22 into contact with both ends of each recording paper K.

Here, for example, it is assumed that recording sheets K of the largest standard size A4, standard size B5, standard size A5, and minimum standard size A6 are stacked on the tray 21.

As shown in FIG. 7A, when each recording paper K of the maximum standard size A4 is loaded on the tray 21, each cursor 22 is moved to the outermost position by touching both ends of each recording paper K. At the same time, the slider 23 is brought into contact with the rear end of each recording paper K and moved to the leftmost position, and the first pinion gear 26 is brought into mesh with the starting end of each widthwise rack gear 24, as shown in FIG. 7(B). The second pinion gear 27 is meshed with the vertical rack gear 25.
<Transition from A4 to B5>
Next, in the state shown in FIGS. 7(A) and 7(B), each recording paper K of standard size B5 is stacked on the tray 21, and each cursor 22 is moved from one to another as shown in FIG. 7(C). When it is moved in the approaching direction and comes into contact with both ends of each recording paper K of standard size B5, the slider 23 is simultaneously moved to the right and comes into contact with the rear end of each recording paper K of standard size B5. Ru. In this case, since the difference in width between the standard sizes A4 and B5 is 34 mm (2 x Δy), when each cursor 22 is moved 17 mm (Δy) in the direction toward each other, each cursor 22 becomes the standard size. It is brought into contact with both ends of each recording paper K of B5. In addition, the difference in length between standard sizes A4 and B5 is 47 mm, and the moving distance Δx of the slider 23 is set to 3 times the moving distance Δy of each cursor 22, so each cursor 22 is 47 mm/3 (approximately 16 mm), the slider 23 is moved approximately 48 mm and comes into contact with the rear end of each recording sheet K of standard size B5.

Therefore, as shown in FIG. 4, a notch 24A of each widthwise rack gear 24 is formed in a range of 16 mm to 18mm (approximately 2 mm width range) from the starting end of each widthwise rack gear 24.

When the cursors 22 are moved 16 mm toward each other as described above, the slider 23 comes into contact with the rear end of each recording paper K of standard size B5. At this time, each cursor 22 reaches just before both ends of each recording paper K of standard size B5, and the first pinion gear 26 moves to the end of each rack gear 24 in the width direction, as shown in FIGS. 7(D) and 7(E). It moves to a position approximately 16 mm away from the section and enters the notch section 24A of each width direction rack gear 24, and the rotation of the first pinion gear 26 and the second pinion gear 27 is stopped. In this state, when each cursor 22 is further moved 1 mm in the direction toward each other, each cursor 22 comes into contact with both ends of each recording paper K of standard size B5, and the first pinion gear 26 is moved in each width direction. The rack gear 24 is moved by the notch 24A without rotating. Further, since the first pinion gear 26 and the second pinion gear 27 do not rotate, the slider 23 remains stopped.
<Transition from B5 to A5>
Next, in the state shown in FIGS. 7(C) and 7(E), each recording paper K of standard size A5 is stacked on the tray 21, and each cursor 22 is moved from one to another as shown in FIG. 8(A). The slider 23 is moved in the approaching direction and comes into contact with both ends of each recording paper K of standard size A5, and the slider 23 is moved to the right and comes into contact with the rear end of each recording paper K of standard size A5. In this case, since the difference in width between the standard sizes B5 and A5 is 28 mm (2 x Δy), when each cursor 22 is moved 14 mm (Δy) in the direction toward each other, each cursor 22 becomes the standard size. It is brought into contact with both ends of each A5 recording paper K. Further, the difference in length between standard sizes B5 and A5 is 40 mm, and the moving distance Δx of the slider 23 is set to 3 times the moving distance Δy of each cursor 22, so each cursor 22 is 40 mm/3 (approximately 14 mm), the slider 23 is moved at least 40 mm and comes into contact with the rear end of each recording paper K of standard size A5.

After the first pinion gear 26 is moved from the end of each rack gear 24 in the width direction to the notch 24A as described above, each cursor 22 is further moved in a direction in which the cursors 22 approach each other as shown in FIG. 8(A). Then, as shown in FIG. 8(B), the first pinion gear 26 comes out from the notch 24A of each width direction rack gear 24 and meshes with each width direction rack gear 24, and the first pinion gear 26 and the first pinion gear 26 2 pinion gear 27 is rotated. In this state, each cursor 22 is moved in the direction of approaching each other by approximately 14 mm as described above, and each cursor 22 is brought into contact with both ends of each recording paper K of standard size A5, and the first pinion gear 26 and As the second pinion gear 27 rotates, the slider 23 is moved by at least 40 mm and comes into contact with the rear end of each recording paper K of standard size A5.
<Transition from A5 to A6>
Next, in the state shown in FIG. 8(A), each recording paper K of standard size A6 is loaded on the tray 21, and each cursor 22 is moved in a direction toward each other as shown in FIG. 8(C). The slider 23 is moved to the right and is brought into contact with the rear end of each recording paper K of standard size A6. In this case, since the difference in width between standard sizes A5 and A6 is 43 mm (2 x Δy), when each cursor 22 is moved by about 21.5 mm (Δy) in the direction toward each other, each cursor 22 are brought into contact with both ends of each recording paper K of standard size A6. In addition, the difference in length between standard sizes A5 and A6 is 62 mm, and the moving distance Δx of the slider 23 is set to 3 times the moving distance Δy of each cursor 22, so each cursor 22 has a length of 62 mm/3 (approximately 20 mm). .5 mm), the slider 23 is moved at least 62 mm and comes into contact with the rear end of each recording paper K of standard size A6.

Therefore, as shown in FIG. 4, a notch 24B is formed at the end of each widthwise rack gear 24.

When the cursors 22 are moved 20.5 mm toward each other as described above, the slider 23 comes into contact with the rear end of each recording paper K of standard size A6. At this time, each cursor 22 reaches just before both ends of each recording paper K of standard size A6, the first pinion gear 26 enters the notch 24B of each width direction rack gear 24, and the first pinion gear 26 and the second pinion gear Rotation of gear 27 is stopped. In this state, when each cursor 22 is further moved 1 mm in the direction toward each other, each cursor 22 comes into contact with both ends of each recording paper K of standard size A6, and the first pinion gear 26 is moved in each width direction. The rack gear 24 is moved by the notch 24A without rotating.

Incidentally, as mentioned above, variations occur in the moving distances of the respective cursors 22 that come into contact with both ends of each recording paper K, and similarly, variations occur in the moving distances of the sliders 23 that come into contact with the rear ends of each recording paper K. Even if they occur, the backlash between each widthwise rack gear 24 and the first pinion gear 26 and the backlash between the longitudinal rack gear 25 and the second pinion gear 27 absorb these variations, so these errors do not become a problem. It won't happen.

In this way, in the paper storage device 10 of this embodiment, the slider 23 moves by three times the movement distance Δx of each cursor 22, and each recording paper The slider 23 is set so that it approaches the rear end of K slightly faster, and a cutout portion 24A (a part of the teeth of each widthwise rack gear 24 connected to each cursor 22 is cut out) Alternatively, since the cutout portion 24B) is provided, the slider 23 can be brought into contact with the rear end of each recording paper K by simply performing an operation to bring each cursor 22 into contact with both ends of each recording paper K. can. For this reason, the paper storage device 10 of this embodiment has a configuration that is simple and suitable for miniaturization, and has a pair of cursors that regulate both ends of the paper in the width direction, and a pair of cursors that regulate the rear end of the paper in the length direction. It can be moved in conjunction with the slider.

Furthermore, each of the width direction rack gears 24, the longitudinal direction rack gears 25, the first pinion gears 26, and the second pinion gears 27 are stacked on the bottom of the main body casing of the paper feed cassette 4, and the space occupied by them is Since it is small, it is possible to provide a paper storage device 10 and a paper feed cassette 4 that are simple and suitable for downsizing.

In the above embodiment, the diameter R2 of the second pinion gear 27 is set to three times the diameter R1 of the first pinion gear 26, but the ratio of these diameters R1 and R2 may be changed as appropriate. In addition, although A4, B5, A6, and A5 are illustrated as standard sizes, for standard sizes of other standards, the ratio of the diameters R1 and R2 of each pinion gear 26 and 27, or the ratio of the diameters R1 and R2 of each rack gear 24 in the width direction It is possible to respond by appropriately setting the position of the notch.

Further, in the above embodiment, a printer is exemplified as an embodiment of the image forming apparatus of the present invention, but this is only an example, and the image forming apparatus may be a multifunction machine, a copy machine, a facsimile machine, or the like.

Further, the configuration of the above embodiment described using FIGS. 1 to 8 is only an example of the present invention, and is not intended to limit the present invention to this configuration.

1 Image forming apparatus 2 Apparatus main body 3 Operating section 4 Paper feed cassette 6 Ejection tray 10 Paper storage device 21 Tray 22 Cursor 23 Slider 24 Width direction rack gear 25 Vertical direction rack gear 26 First pinion gear 27 Second pinion gear 28 Frame body

Claims (3)

A tray on which paper is loaded,
a pair of cursors that are movable in the width direction of the paper placed on the tray and abut against both ends of the paper;
a slider provided on the tray so as to be movable in a vertical direction perpendicular to the width direction of the paper and abutted against a rear end of the paper;
a pair of width direction rack gears connected to each of the cursors, protruding inside each of the cursors, and moving in the width direction of the sheet together with the cursors;
a vertical rack gear connected to the slider, protruding toward the leading end of the paper, and extending in a direction perpendicular to each of the width direction rack gears;
a first pinion gear that is sandwiched between the width direction rack gears, meshes with the width direction rack gears, and causes the width direction rack gears and the cursors to move in a direction passing each other;
a second pinion gear meshing with the vertical rack gear;
The first pinion gear and the second pinion gear are supported and fixed by the same shaft, and as each of the width direction rack gears and each of the cursors move in a direction passing each other, the first pinion gear and the second pinion gear are fixed. A gear is rotated to interlock the vertical movement of the vertical rack gear and the slider, and each width rack gear is provided with a cutout portion in which a part of a tooth that meshes with the first pinion gear is cut out. Paper storage device provided. The tray can be loaded with multiple types of standard size paper,
The various standard sizes mentioned above have a vertical length longer than a width,
The paper storage device according to claim 1, wherein the diameter of the second pinion gear is made larger than the diameter of the first pinion gear based on the ratio of the vertical length to the width of the various standard sizes. A paper storage device according to claim 1 or claim 2;
a paper feed roller that pulls out and conveys paper from the paper storage device;
An image forming apparatus comprising: an image forming section that records an image on a sheet of paper pulled out and conveyed by the paper feed roller.