JPH08217262A - Paper feeding device - Google Patents

Abstract

PURPOSE: To facilitate adjustment of the positions of side fences by fixing one side fence through a process of engaging a projecting part of a specified position fixed-type stopper with a recessed groove of a first engaging part, and fixing the other side fence through a process of engaging a stopper claw of a claw fixed-type stopper with an engaging tooth of a second engaging part. CONSTITUTION: A paper feeding tray housing part in a copying machine is provided with a paper feeding tray 1 capable of being taken in and out from the front of a main body, and side fences 3, 4 are respectively provided on the front side and the innermost side in the tray drawing-out direction Y in this paper feeding tray 1. A claw fixed-type stopper 23, a specified position fixed-type stopper 25 are respectively provided on stopper supporting parts 5 of respective side fences 3, 4 so as to be turned by the specified angle, and a stopper claw 24 is formed on the lower part of the stopper 23 at a specified pitch, and a projecting part 26 is formed on the lower part of the stopper 25. Engaging parts 27, 28 are provided on the paper feeding tray 1 so as to face the stopper claw 24 and the projecting part 26, and the adjustment of the positions of the side fences 3, 4 is achieved by the engagement.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet feeding device of an image forming apparatus such as a copying machine, a printer and a facsimile.

[0002]

2. Description of the Related Art Conventionally, by sliding a pair of side fences on a paper feed tray in accordance with the size of the paper to be fed, and positioning the paper in the left-right direction with respect to the paper feed / conveyance direction, it is possible to set an arbitrary position. There is a paper feeding device that can stack sheets of different sizes.

However, in such a sheet feeding device, since the side fence is slidably movable, the stop position of the side fence is displaced. As a result, the positions of the sheets are varied, which causes a defective copy position, and defective transport such as non-feeding and double feeding.

Therefore, there is a sheet feeding device provided with a stopper on the side fence in order to prevent the stop position of the side fence from being displaced. Such a sheet feeding device has a pair of side fences provided with stoppers, a rack,
There are those in which a stopper is provided on either one of the side fences connected by a pinion, and those in which a stopper is provided on each of the rack and the side fences connected by a pinion.

Here, a sheet feeding tray of a sheet feeding device in which stoppers are provided on a pair of side fences, respectively, is shown in FIG.
1 and FIG. 12 will be described. Paper tray 1 has
The guide groove 2 is formed along a direction Y that is orthogonal to the sheet feeding and conveying direction X. The paper feed tray 1 is provided with a pair of side fences 3 and 4 slidably along the guide groove 2. A stopper support portion 5 is formed on each of the side fences 3 and 4. These stopper support parts 5 include stoppers 6, 7
Are rotatably provided at a fixed angle. Below the stoppers 6 and 7, serrated stopper claws 8 and 9 are formed. The stopper claws 8 and 9 are formed with an inclined portion only on the center side in the paper feed / transport direction X. Further, engaging portions 10 and 11 are formed on the paper feed tray 1 so as to face the stopper pawls 8 and 9. At this time, the stoppers 6 and 7 are rotated by being urged by a spring or the like, and the stopper claws 8 and 9 are engaged with the engaging portions 10 and 11 to fix the side fences 3 and 4. . A rear end fence 12 is slidably provided in the sheet feeding tray 1 along the sheet feeding and conveying direction X, and a bottom plate 13 is provided at a front center in the sheet feeding and conveying direction X so as to be rotatable by a predetermined angle. ing. In addition, the pair of side fences 3,
A corner claw 14 is provided on each of the positions 4 on the front side in the paper feeding and conveying direction X so as to be rotatable by a predetermined angle.

In such a structure, the side fences 3 and 4 are pushed toward the center side in the sheet feeding and conveying direction X because the inclined portions of the stopper claws 8 and 9 are formed only on the center side in the sheet feeding and conveying direction. Then, the stopper claws 8 and 9 and the engaging portions 10 and 11
And move away and slide. However, when pushed in a direction away from the center of the paper feed / transport direction X, the stopper claws 8,
9 and the engaging portions 10 and 11 are engaged and do not move.

Next, a paper feed tray of a paper feed device in which a stopper is provided on one of the side fences connected by a rack and a pinion will be described with reference to FIGS. 13 and 14. However, the same parts as those of the above-described conventional example are denoted by the same reference numerals, and the description thereof will be omitted (the same applies hereinafter). The paper feed tray 1 is provided with side fences 15 and 16 slidably along the guide groove 2. These side fences 15,1
A rack 17 is provided at 6. A pinion gear 18 is rotatably held on the central axis of the paper feed tray 1 in the paper feed direction X. At this time, the racks 17 and the pinion gears 18 are engaged with each other to connect the side fences 15 and 16 to each other. Further, the side fence 15 is provided with a stopper support portion 5 and a stopper 6. Further, the paper feed tray 1 is provided with an engaging portion 10 facing the stopper claw 8.

In such a structure, the side fences 15 and 16 interlock with each other, slide symmetrically across the central axis of the sheet feeding and conveying direction X, and are fixed only by the stopper 6. Therefore, it is possible to position the sheet in alignment with the central axis of the sheet feeding / conveying direction X.

Further, a paper feed tray of a paper feed device in which stoppers are provided on the side fences connected by a rack and a pinion will be described with reference to FIGS. 15 and 16. The paper feed tray 1 is provided with a side fence 19 slidably along the guide groove 2. The side fence 19 is provided with a rack 17. The side fence 19 is connected to the side fence 15 by engaging the racks 17 and the pinion gears 18. Further, a stopper support portion 5 is formed on the side fence 19 and the stopper 7
Is provided. The paper feed tray 1 is provided with an engaging portion 11 facing the stopper claw 9.

In such a structure, the side fences 15 and 19 interlock with each other, slide symmetrically across the center of the sheet feeding and conveying direction X, and the side fences 15 and 19 are separated by the stoppers 6 and 7. Fixed to.

[0011]

The sheet feeding device provided with the stoppers 6 and 7 on each of the pair of side fences 3 and 4 described above is effective for preventing the shift of the stop position after the sheet is positioned. However, it is necessary to operate the two stoppers 6 and 7 to slide and move the side fences 3 and 4 to position and fix the side fences 3 and 4.
It is difficult to position the paper in line with the central axis of, and the operability is poor.

Further, in the paper feeding device in which the stopper 6 is provided on either one of the side fences 15 and 16 which are connected by the rack 17 and the pinion gear 18, there is looseness in the connecting portion between the rack 17 and the pinion gear 18. As a result, a gap is created between the sheet and the side fences 15 and 16, and the position of the sheet varies. This allows
Since the conveyance quality becomes unstable, a defective copy position occurs.

Furthermore, the side fences 15 and 16 connected by the rack 17 and the pinion gear 18 described above.
In the paper feeding device in which the stopper 6 is provided in either one of the two, the direction Y orthogonal to the paper feeding and conveying direction X of the paper is set as the paper feeding tray pulling direction, and the paper feeding tray 1 is set in the paper feeding tray pulling direction Y. If it is taken in and out, when the paper feed tray 1 is stored in the paper feed device, an inertial force acts on the paper, and the side fence 16 on the back side in the paper feed tray pull-out direction Y is pushed. At this time, since the side fences 15 and 16 are bent or loosened, the paper moves to the back side of the paper feeding device,
The space between the paper and the side fences 15 and 16 is widened. As a result, the conveyance quality becomes unstable, resulting in defective copying.

Further, when the corner claw separation method is used for the paper feeding device for taking the paper feeding tray 1 in and out in the paper feeding tray withdrawing direction Y, the paper may be damaged by the impact when the paper feeding tray 1 is slid and set. If the paper moves to the back side even for a moment, the paper comes off from the front side corner claw 14. Therefore, feeding failure such as non-feeding or double feeding occurs, and the conveyance quality becomes unstable.

Therefore, in the above-described paper feeding apparatus for taking in and out the paper feeding tray 1 in the paper feeding tray withdrawing direction Y, if the stopper 6 is provided on one of the two side fences 15 and 16, the back side is provided. The one provided on the fence 16
It is effective to prevent the movement of the paper due to the impact when the paper feed tray 1 is slid and set. However, when the side fence 16 is provided with the stopper, the operability becomes worse than when the side fence 15 is provided with the stopper 6.

Further, the side fences 15, 19 connected by the rack 17 and the pinion gear 18 described above.
In the paper feeding device in which the stoppers 6 and 7 are provided respectively, the fixed pawl type stoppers 6 and 7 are used as the stoppers of the side fences 15 and 19, so rattling occurs due to the claw pitch, and the paper and each side fence are A gap is formed between the sheets 15 and 19 and the position of the sheet varies. As a result, the conveyance quality becomes unstable and a copy position defect occurs.

The rattling due to the claw pitch can be suppressed by reducing the claw pitch. However, the fixing force for preventing the shift of the stop positions of the side fences 15 and 19 becomes weak. Therefore, if the claw pitch is made small, feeding failure such as non-feeding and double feeding occurs, and the conveyance quality becomes unstable.

The rack 17 and the pinion gear 1 described above are also provided.
When a fixed position type stopper is used as the stopper of the side fences 15 and 19 in the paper feeding device in which the stoppers 6 and 7 are provided on the side fences 15 and 19 connected to each other by 8 respectively, the fixing force is fixed. Although the operability and the operability can be improved, the positions of the side fences 15 and 19 cannot be finely adjusted, and the size of the paper varies depending on the type, environment, and the like, resulting in large backlash. There is a gap between the side fences 15 and 19,
The position of the paper varies. As a result, the conveyance quality becomes unstable, and a defective copy position occurs.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a sheet feeding device provided with a side fence having a stopper with good operability and capable of obtaining stable conveyance quality. .

[0020]

According to the first aspect of the present invention,
A paper feed tray on which the sheets are stacked, a pair of side fences that are slidable in the left and right direction and that is positioned in the left and right direction with respect to the paper feed and conveyance direction of the paper on the paper feed tray, and are defined according to the paper size. A first engaging portion in which a deep groove is formed for each fixed position, and a convex portion provided in one of the side fences and selectively engaged with any of the groove. A fixed-position fixed type stopper urged in the engaging direction, a second engaging portion in which engaging teeth are formed at a fine constant pitch over the sliding range of the side fence, and the other side fence. And a pawl fixing type stopper having a stopper pawl selectively engaged with an arbitrary portion of the engaging tooth and biased in the engaging direction.

According to a second aspect of the present invention, there is provided a paper feed tray in which papers are stacked and accommodated in the paper feed tray accommodating section from a direction orthogonal to the paper feed / conveyance direction of the papers. A pair of side fences that are slidable in the left-right direction and are positioned in the left-right direction with respect to the paper feeding and conveying direction of the paper, and a first deep groove is formed at each fixed position determined according to the paper size. Fixed position stopper which is biased in the engaging direction and has an engaging portion and a convex portion which is provided on the back side fence and engages selectively with any of the concave grooves. A second engaging portion having engaging teeth formed over the sliding range of the side fence at a fine constant pitch; and a second engaging portion provided on the front side fence and at an arbitrary portion of the engaging tooth. Has a stopper claw that selectively engages And a biased pawl fixed stopper in the direction of engagement.

According to a third aspect of the present invention, there is provided a paper feed tray on which sheets are stacked, and a pair of left and right slidable plates which are positioned on the paper feed tray in the left and right directions with respect to the paper feed and conveyance direction of the paper. A side fence, a connecting portion that connects these side fences with a rack and a pinion, a first engaging portion in which engaging teeth are formed at a constant pitch over the sliding range of the side fence, and one of A pawl fixed first stopper that is provided on the side fence and has a first stopper pawl that selectively engages an arbitrary portion of the engaging tooth, and that is biased in the engagement direction; A second engaging portion in which engaging teeth are formed over the sliding range of the side fence at a constant pitch different from that of the first stopper claw, and an arbitrary one of the engaging teeth is provided on the other side fence. part And a second stopper biased pawl fixed to the engagement direction with a second stopper pawl to selectively engage.

According to a fourth aspect of the present invention, there is provided a paper feed tray in which papers are stacked and accommodated in the paper feed tray accommodating portion from a direction orthogonal to the paper feed / conveyance direction of the papers. A pair of side fences that are slidable in the left-right direction and positioned in the left-right direction with respect to the paper feeding and conveying direction of the sheet, and a connecting portion that connects the side fences with a rack and a pinion, and engages at a constant pitch. A first engaging portion having teeth formed over the sliding range of the side fence, and a first engaging portion provided on the front side fence and selectively engaging any portion of the engaging teeth. First claw-fixing type that has a stopper claw and is urged in the engagement direction
And a second engaging portion in which engaging teeth are formed at a pitch larger than the first claw pitch over the sliding range of the side fence, and the second side engaging portion is provided on the back side of the side fence. A second pawl-fixing type stopper having a second stopper pawl that selectively engages an arbitrary portion of the engaging tooth and is biased in the engaging direction.

According to a fifth aspect of the present invention, there is provided a paper feed tray in which paper is stacked and accommodated in a paper feed tray accommodating portion in a direction orthogonal to the paper feed and conveyance direction of the paper, and the paper feed tray is provided on the paper feed tray. A pair of side fences that are slidable in the left-right direction and positioned in the left-right direction with respect to the paper feeding and conveying direction of the sheet, and a connecting portion that connects the side fences with a rack and a pinion, and engages at a constant pitch. A first engaging portion having teeth formed over the sliding range of the side fence, and a first engaging portion provided on the front side fence and selectively engaging any portion of the engaging teeth. A fixed first stopper which has a stopper claw and is formed so that the inclined portion of the first stopper claw is formed toward the front side of the paper tray accommodating portion and is biased in the engagement direction, The engaging teeth at the pitch of A second engagement portion formed over the sliding range of the id fence and a second stopper claw provided on the back side fence and selectively engaged with an arbitrary portion of the engagement tooth. The second stopper pawl includes a second pawl-fixing type stopper in which the inclined portion of the second pawl is formed toward the front side and is biased in the engaging direction.

According to a sixth aspect of the present invention, there is provided a paper feed tray in which papers are stacked and accommodated in a paper feed tray accommodating portion from a direction orthogonal to the paper feed and conveyance direction of the papers, and the paper feed tray is provided on the paper feed tray. A pair of side fences that are slidable in the left-right direction and positioned in the left-right direction with respect to the paper feeding and conveying direction of the sheet, and a connecting portion that connects the side fences with a rack and a pinion, and engages at a constant pitch. An engagement portion having teeth formed over the sliding range of the side fence,
It is provided on the back side fence and has stopper claws that selectively engage any part of the engaging teeth, and is arranged on the front side of the front side fence and attached in the engaging direction. And a stopper fixed with a biased claw.

According to a seventh aspect of the present invention, there is provided a paper feed tray in which papers are stacked and accommodated in a paper feed tray accommodating section from a direction orthogonal to the paper feed and conveyance direction of the papers, and the paper feed tray is provided on the paper feed tray. A pair of side fences that are slidable in the left-right direction and positioned in the left-right direction with respect to the paper feeding and conveying direction of the sheet, and a connecting portion that connects the side fences with a rack and a pinion, and engages at a constant pitch. A first engaging portion having teeth formed over the sliding range of the side fence, and a stopper claw provided on the back side fence and selectively engaged with an arbitrary portion of the engaging tooth. A claw-fixing type stopper that is disposed on the front side of the side fence on the front side and is biased in the engaging direction,
A second engaging portion in which a shallow groove is formed at each fixed position determined in accordance with the sheet size, and the side fence on the front side, which is selectively engaged with either of the groove. A fixed position fixed type click type stopper having matching convex portions and biased in the engaging direction is provided.

According to an eighth aspect of the present invention, there is provided a paper feed tray on which sheets are stacked, and a pair of left and right slidable sides which are positioned on the paper feed tray in the left and right directions with respect to the paper feed and conveyance direction of the paper. A fence, a connecting portion that connects these side fences with a rack and a pinion, and an engagement tooth that is provided on one of the side fences and that has engaging teeth formed at a constant pitch over the sliding range of the side fence. And a claw-fixing type stopper provided on the other side fence and having a stopper claw that selectively engages an arbitrary part of the engaging tooth and is urged in the engaging direction. .

[0028]

According to the first aspect of the invention, the convex portion of the fixed-position fixed stopper deeply engages with any one of the concave grooves of the first engaging portion to fix one side fence. With this, operability and fixing force can be improved, and the stopper claw of the claw-fixing type stopper engages with any part of the engaging teeth of the second engaging part to fix the other side fence. By doing so, the position of the side fence can be finely adjusted, and the gap between the paper and each side fence can be reduced. Therefore, when a stopper is provided on each of the pair of side fences, the sheet can be positioned in accordance with the central axis in the sheet feeding / conveying direction, a stopper with good operability can be obtained, and the conveying quality is stable.

According to the second aspect of the present invention, the convex portion of the fixed-position fixed stopper deeply engages with any one of the concave grooves of the first engaging portion to fix the back side fence. As a result, operability and fixing force can be improved,
It is possible to prevent the movement of the paper due to the impact when the paper feed tray is stored in the paper feed tray storage portion, and the stopper pawl of the pawl fixing type stopper has an arbitrary portion of the engaging teeth of the second engaging portion. By fixing the side fence on the front side by engaging with, the position of the side fence on the front side can be finely adjusted, and the gap between the sheet and each side fence can be reduced. Therefore, when a stopper is provided on each of the pair of side fences, the sheet can be positioned in accordance with the central axis in the sheet feeding / conveying direction, a stopper with good operability can be obtained, and the conveying quality is stable.

According to the third aspect of the present invention, since the pitch of the first stopper claws and the pitch of the second stopper claws are different, the stopper claws formed with a larger pitch are provided on any part of the engaging teeth. By engaging and fixing one of the side fences, it is possible to improve the fixing force, and further, the stopper claws formed at a smaller pitch engage with any part of the engaging teeth and the other By fixing the side fence, the position of the side fence can be finely adjusted, the gap between the paper and each side fence can be reduced, and the side fence provided with the claw-fixing-type first stopper is also provided. The operability can be improved by connecting the side fence provided with the claw-fixing type second stopper with the connecting portion. Therefore, when a stopper is provided on each of the side fences connected by the rack and the pinion, operability and fixing force can be improved and fine adjustment of the side fences can be performed together, and a stopper with good operability can be obtained. In addition, the transportation quality is stable.

In the invention of claim 4, the pitch of the second stopper claw is larger than the pitch of the first stopper claw, so that the second stopper claw of the second claw-fixing type stopper is the second. By fixing the side fence on the back side by engaging any part of the engaging teeth of the engaging part of, the fixing force can be improved and the paper feed tray is stored in the paper feed tray storage part. It is possible to prevent the movement of the paper due to the impact at the time of performing, and further, the first stopper claw of the first claw-fixing type first stopper engages with any part of the engaging teeth of the first engaging portion. By fixing the side fence on the front side, the position of the side fence can be finely adjusted, the gap between the paper and each side fence can be made small, and the first pawl-fixing type stopper can be used. Fixed side fence and claw fixing on the front side A rear side of the side fence provided with a second stopper by connected by a connecting portion, it is possible to improve the operability of the. Therefore, when a stopper is provided on each of the side fences connected by the rack and the pinion, operability and fixing force can be improved and fine adjustment of the side fences can be performed together, and a stopper with good operability can be obtained. In addition, the transportation quality is stable.

According to the fifth aspect of the present invention, since the inclined portion of the first stopper pawl and the inclined portion of the second stopper pawl are both facing the front side of the paper feed tray accommodating portion, the front side is the connecting portion. By connecting the side fence and the back side fence, the first stopper claw engages with any part of the engaging teeth of the first engaging portion to fix the front side fence, A force that pushes the front side fence toward the rear side of the paper feed tray storage portion acts to reduce the gap between the paper and each side fence, and further, the second stopper claw has the second engagement portion. By fixing the side fence on the back side by engaging with any part of the engaging teeth of, it is possible to prevent the movement of the paper due to the impact when the paper feed tray is stored in the paper feed tray storage portion. , The hand with the claw fixed first stopper By connecting the rear side of the side fence provided with a second stop on the side of the side fences and the pawl fixed at the junction, it is possible to improve the operability. Therefore, when a stopper is provided on each of the side fences connected by the rack and the pinion, operability and fixing force can be improved and fine adjustment of the side fences can be performed together, and a stopper with good operability can be obtained. In addition, the transportation quality is stable.

According to the sixth aspect of the present invention, the stopper pawl of the pawl fixing type stopper engages with an arbitrary portion of the engaging teeth of the engaging portion to fix the side fence on the back side, thereby feeding the paper. It is possible to prevent the movement of the paper due to the impact when the tray is stored in the paper feed tray storage section, and it is possible to finely adjust the position of the side fence to reduce the gap between the paper and each side fence. In addition, the pawl fixed stopper is placed in front of the front side fence, and the front side fence and the rear side fence are connected at the connecting part, which improves operability. it can. Therefore, when a stopper is provided on one of the side fences connected by the rack and the pinion, a sufficient fixing force can be obtained to prevent displacement of the stop position of the side fence, and a stopper with good operability can be obtained. In addition, the transportation quality is stable.

According to the seventh aspect of the invention, the stopper claw of the claw-fixing type stopper engages an arbitrary part of the engaging teeth of the engaging part to fix the side fence on the back side, and the convex part engages. By fixing the side fence on the front side by engaging the joint part, it is possible to more reliably prevent the movement of the paper due to the impact when the paper feed tray is stored in the paper feed tray storage portion.
In addition, the position of the side fence can be finely adjusted to reduce the gap between the paper and each side fence, and the stopper of the side fence on the front side can be used as a click type stopper and a claw fixed type stopper. Is arranged in front of the front side fence, and the front side fence and the rear side fence are connected by the connecting portion, so that the operability can be improved. Therefore,
When a stopper is provided on one of the side fences connected by a rack and a pinion, a sufficient fixing force can be obtained to prevent displacement of the stop position of the side fence, and a stopper with good operability can be obtained, and Conveyance quality is stable.

In the invention of claim 8, the pair of side fences are connected by the connecting portion, and the stopper claws provided on one side fence are engaged with the engaging claws provided on the other side fence. By fixing the side fence, the operability and the fixing force can be improved, and the position of the side fence can be finely adjusted to reduce the gap between the paper and each side fence. Therefore, when a stopper is provided on one of the side fences connected by the rack and pinion,
A fixing force sufficient to prevent displacement of the stop position of the side fence is obtained, a stopper with good operability is obtained, and the transportation quality is stable.

[0036]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the invention described in claims 1 and 2 is shown in FIG.
Or, it demonstrates based on FIG. The present embodiment is a paper feeding device 20 in which stoppers are provided on the pair of side fences 3 and 4, respectively. A paper feed tray accommodating portion 22 is formed in the lower portion of the main body of the copying machine 21 including the paper feeding device 20 of this embodiment. The paper tray 1 can be inserted into and taken out of the paper tray storage unit 22 from the front of the main body in the paper feed tray withdrawing direction Y.
Is provided. The paper feed tray 1 is provided with a side fence 3 on the front side in the paper feed tray pull-out direction Y and a side fence 4 on the back side in the paper feed tray pull-out direction Y. On the stopper support portion 5 of the side fence 3, a pawl fixed stopper 23 is provided so as to be rotatable by a predetermined angle. Under the stopper 23, stopper claws 24 are formed at a constant pitch. A fixed position fixed stopper 25 is provided on the stopper support portion 5 of the side fence 4 so as to be rotatable by a predetermined angle. A convex portion 26 is formed below the stopper 25. Further, the paper feed tray 1 has the stopper claws 2
4 is provided with a second engaging portion 27, and the convex portion 26 is provided with a first engaging portion 28.
It should be noted that the stopper claw 24 has a sheet feeding tray withdrawing direction Y.
The inclined portion is formed only on the inner side. Further, the engagement portion 27 is formed with sawtooth-shaped engagement teeth 27a at a constant pitch. In addition, the engaging portion 28 is formed with a plurality of concave grooves 29 in which the convex portion 26 is selectively engaged, in accordance with a rated sheet size. Further, the stoppers 23 and 25 have upper portions biased rearward in the sheet feeding and conveying direction X by a spring 30 and lower portions rotating forward by a certain angle in the sheet feeding and conveying direction X. At this time, the stopper claw 24 and the engaging tooth 27a are engaged to fix the side fence 3, and the convex portion 26 and the groove 29 are engaged to fix the side fence 4. There is. Therefore, the side fence 3 is provided with the stopper claw 24 and the engaging tooth 2.
The side fence 3 is fixed at a free position according to the pitch of 7a, and the side fence 3 is fixed at a position matching the rated size according to the groove 29.

Further, the side fence 3 is formed with a guide portion 31 which fits in the guide groove 2. Further, although not shown, the side fence 4 is also provided with the guide portion 31 similarly to the side fence 3. Thereby, the side fence 3,
4 slides along the guide groove 2.

In such a structure, in the side fence 3, the inclined portion of the stopper claw 24 has the sheet feeding tray pulling direction Y.
Since it is formed only on the inner side of the sheet feeding direction X, the stopper claw 24 and the engaging tooth 27a are disengaged and slid when pushed toward the center side of the sheet feeding direction X, and move away from the center of the sheet feeding direction X. When pushed to, the stopper claw 24 and the engaging tooth 27a are engaged and do not move. Further, the side fence 4 does not move even if it is pushed toward the center of the sheet feeding / conveying direction X or is pushed away from the center of the sheet feeding / conveying direction X.

Therefore, when positioning the side fences 3 and 4 in accordance with the paper 32 to be fed, first, the upper portion of the stopper 25 is picked up and the side fence 4 is slid to move to the size of the paper 32. Position according to the closest rated paper size. Then, the stopper 25 is released, the convex portion 26 and the concave groove 29 are engaged with each other, and the side fence 4 is fixed. After that, the paper 32 is placed on the bottom plate 13
On top of. At this time, the front end of the paper 32 is brought into contact with the front wall surface of the paper feed tray 1 in the paper feed conveyance direction X.
Then, the side fence 3 is slid to move the paper 3
Position according to size 2. At this time, the corner claw 14 is brought into contact with the uppermost sheet 32, and the sheet 32 is pressed by the weight of the corner claw 14.

Further, the trailing edge fence 12 is slid and moved to be fixed according to the size of the paper 32. afterwards,
The paper feed tray 1 on which the paper 32 is stacked is slid on the copying machine 21. Then, the sheet 32 is fed by the corner claw separation method.

In this way, the side fence 4 can be positioned by the stopper 25 in accordance with the rated paper size, and the side fence 4 is fed when the paper feed tray 1 is slid on the copying machine 21. It is possible to prevent the paper tray from moving in the drawing direction Y.
Further, the side fence 3 can be positioned by the stopper 23 in accordance with the size of the sheet 32, and the gap between the sheet 32 and the side fences 3 and 4 can be suppressed. Therefore, the stopper 2 is attached to the side fence 4.
5, the side fence 3 is provided with the stopper 23, so that the operability and the fixing force can be improved.
Moreover, the position of the side fence 3 can be finely adjusted. Therefore, it is possible to obtain a stopper with good operability and obtain stable conveyance quality. Further, by shortening the pitch of the stopper claws 24, finer adjustment can be performed.

In this embodiment, the paper feed tray storage unit 2
The sheet feeding device is described as an example of application to the sheet feeding device 20 in which the sheet feeding tray 1 with respect to 2 is taken in and out in the sheet feeding tray withdrawing direction Y orthogonal to the sheet feeding and conveying direction X, but the sheet feeding device according to claim 1 is configured. In the above, the present invention is not limited to this, and may be, for example, a paper feeding device that sets the paper feeding tray 1 in the paper feeding and conveying direction X. In this case, it is not always necessary to provide the side fence 3 with the claw fixing type stopper 23 and the side fence 4 with the fixed position fixing type stopper 25 as in the present embodiment. A fixed position fixed type stopper 25 may be provided on the side fence 4, and a claw fixed type stopper may be provided on the side fence 4.

An embodiment of the invention described in claims 3 and 4 will be described with reference to FIG. In this embodiment, the side fence 1 connected by a rack 17 and a pinion gear 18
This is a sheet feeding device in which stoppers 5 and 19 are provided. A first pawl-fixing type stopper 23 is provided on the stopper support portion 5 of the side fence 15 so as to be rotatable by a predetermined angle. A second pawl-fixing type stopper 33 is provided on the stopper support portion 5 of the side fence 19 so as to be rotatable by a predetermined angle. At the bottom of this stopper 33,
The stopper claws 34 are formed with a pitch larger than the pitch of the stopper claws 24. Then, in the paper feed tray 1,
A second engaging portion 35 is formed so as to face the stopper claw 34. Sawtooth-shaped engagement teeth 35a are formed on the engagement portion 35 at a pitch larger than the pitch of the engagement teeth 27a. The stopper claw 34 is provided with an inclined portion only on the front side in the paper feed tray drawing direction Y. Further, the stopper 33 has an upper portion urged rearward in the sheet feeding / conveying direction X by a spring 30 and a lower portion rotating forward by a certain angle in the sheet feeding / conveying direction X. As a result, the stopper claw 34 and the engaging portion 35 engage with each other to fix the side fence 19.

In such a structure, the side fences 15 and 19 are connected to each other by the rack 17 and the pinion gear 18, and the inclined portions of the stopper claws 24 and 34 are only on the center side in the sheet feeding and conveying direction X. Since it is formed, when it is pushed toward the center side in the sheet feeding and conveying direction X, the stopper claws 24 and 34 and the engaging teeth 27a and 35a are separated,
It slides symmetrically across the central axis of the sheet feeding and conveying direction X. However, when pushed in a direction away from the center of the sheet feeding / conveying direction X, the stopper claws 24, 34 and the engaging teeth 27a,
35a is engaged and does not move. Therefore, when the side fences 15 and 19 are moved away from the center in the sheet feeding / conveying direction X, the upper portions of the stoppers 23 and 33 are pinched and the stopper claws 2 are
4, 34 and the engaging teeth 27a, 35a are separated, and the side fences 15, 19 are slid.

Thus, the rack 17 and the pinion gear 1
The stoppers 23 and 33 of the side fences 15 and 19 connected to each other are fixed hook type stoppers, and the pitch of the stopper hooks 24 is small.
9 can be positioned according to the size of the sheet 32, and the gap between the sheet 32 and the side fences 15 and 19 can be suppressed. In addition, the stopper claw 24
The pitch of the stopper claws 34 is large and the fixing force is large as compared with the pitch of 1., the movement of the side fence 19 that occurs when the paper feed tray 1 is slid on the copying machine 21 is moved inward in the paper feed tray drawing direction Y. Can be prevented.
Therefore, interlock the side fences 15 and 19 with each other,
By providing the stopper 33 on the side fence 19 and the stopper 23 on the side fence 15, the operability and the fixing force can be improved, and the position of the side fence 15 can be finely adjusted. Therefore, it is possible to obtain a stopper with good operability and obtain stable conveyance quality.

Since the side fences 15 and 19 are connected by the rack 17 and the pinion gear 18,
Fine adjustment can be performed by the stoppers 23 and 33 within the range of the play generated in the rack 17, the pinion gear 18, and the like. Therefore, by expanding the play range during manufacturing,
It is also possible to expand the range of fine adjustment.

An embodiment of the invention described in claim 5 will be described with reference to FIG. In this embodiment, the side fences 15 and 1 connected by the rack 17 and the pinion gear 18 are connected.
9 is a sheet feeding device provided with stoppers. A first pawl-fixing type stopper 36 is provided on the stopper support portion 5 of the side fence 15 so as to be rotatable by a predetermined angle. A stopper claw 37 is formed below the stopper 36. An inclined portion 38 is formed only on the front side of the stopper claw 37 in the paper feed tray drawing direction Y.
Further, a second pawl-fixing type stopper 39 is provided on the stopper supporting portion 5 of the side fence 19 so as to be rotatable by a predetermined angle. A stopper claw 40 is formed below the stopper 39. An inclined portion 41 is formed on the stopper claw 40 only on the front side in the paper feed tray drawing direction Y. The stopper claw 3 is provided on the paper feed tray 1.
7, a first engaging portion 42 is formed so as to face the stopper 7, and a second engaging portion 43 is formed so as to face the stopper claw 40. The engagement portion 42 is formed with serrated engagement teeth 42a at a constant pitch. Further, the engagement portion 43 is formed with sawtooth-shaped engagement teeth 43a at the same pitch as the engagement teeth 42a. Further, the stopper 36,
The upper portion of 39 is biased rearward in the sheet feeding / conveying direction X by the spring 30, and the lower portion is rotated forward by a certain angle in the sheet feeding / conveying direction X. Accordingly, the stopper claw 37 and the engaging portion 42
Engage with to fix the side fence 15, and the stopper claw 40 engages with the engaging portion 43 to fix the side fence 19.

In such a structure, the side fences 15 and 19 are connected by the rack 17 and the pinion gear 18, and the inclined portions 38 and 41 of the stopper claws 37 and 40 are located in the front in the paper feed tray drawing direction Y. Since it is formed only on the side, when it is pushed toward the center side in the sheet feeding and conveying direction X, the stopper claw 37 and the engaging tooth 42a engage with each other and do not move. Further, when pushed in the direction away from the center of the sheet feeding / conveying direction X, the stopper claw 40 and the engaging tooth 43a engage and do not move. Therefore, when the side fences 15 and 19 are moved to the center side in the sheet feeding / conveying direction X, the stopper 3
The upper part of 6 is picked up, the stopper claw 37 and the engaging portion 42 are separated, and only the side fence 15 is pushed toward the center side in the sheet feeding and conveying direction X, and the side fences 15 and 19 are slid. Then, when the side fences 15 and 19 are moved away from the center of the sheet feeding / conveying direction X, the stopper 39 is pinched to separate the stopper claw 40 from the engaging portion 43, and only the side fence 19 is fed in the sheet feeding / conveying direction. Push the side away from the center of X to slide the side fences 15 and 19.

Thus, the rack 17 and the pinion gear 1
Since the stoppers 36 and 39 of the side fences 15 and 19 connected by 8 are pawl-fixing type stoppers, and the inclined portion 38 of the stopper pawl 37 is formed only on the front side in the paper feed tray drawing direction Y, Since a force is applied from the stopper 36 to the side fence 15 toward the rear side in the paper feed tray drawing direction Y, the side fences 15 and 19 can be positioned according to the size of the paper 32, and the paper 32 and each side fence 15 can be positioned. , 19 can be suppressed. Further, since the inclined portion 41 of the stopper claw 40 is formed only on the front side in the paper feed tray pull-out direction Y, the paper feed tray pull-out of the side fence 19 which occurs when the paper feed tray 1 is slid and set on the copying machine 21. It is possible to prevent the movement to the back side in the direction Y. Therefore, side fence 1
By providing the side fence 19 with the stopper 39 and the side fence 15 with the stopper 36, the operability and the fixing force can be improved, and the position of the side fence 15 can be improved slightly. Adjustments can be made. Therefore, it is possible to obtain a stopper with good operability and obtain stable conveyance quality.

An embodiment of the invention described in claims 6 and 7 will be described with reference to FIGS. 8 and 9. In this embodiment, the rack 1
This is a sheet feeding device in which stoppers are provided on the side fences 15 and 19 which are connected to each other by the pinion gears 18 and 7. On the lower surface of the side fence 19, a rack 44
Has been fixed. The rack 44 is provided with a stopper support portion 45 at the front end on the front side in the paper feed tray drawing direction Y. The stopper 39 is attached to the stopper support portion 45.
Are rotatably provided at a fixed angle. The rack 44
Engages with the pinion gear 18, and the stopper support portion 4
The length 5 is located closer to the front side of the side fence 15 than the side fence 15 in the paper feed tray drawing direction Y. In addition, rack 1
7, the pinion gear 18 and the rack 44 form a connecting portion. A click-type stopper 46 is provided on the stopper support portion 5 of the side fence 15 so as to be rotatable by a predetermined angle. A triangular protrusion 47 is formed below the stopper 46. Also,
The paper feed tray 1 has an engaging portion 4 facing the convex portion 47.
8 are provided. The engaging portion 48 is formed with V-shaped grooves 49 which are a plurality of concave grooves to which the convex portions 47 are selectively engaged according to the rated sheet size. Further, the stopper 46 has its upper portion biased rearward in the sheet feeding and conveying direction X by the spring 30, and its lower portion is rotated forward by a certain angle in the sheet feeding and conveying direction X. At this time, the convex part 47 and the V-shaped groove 49 are engaged with each other to fix the side fence 15.

In such a structure, the side fences 15 and 19 are connected by the rack 17 and the pinion gear 18, the stopper 46 of the side fence 15 is a click type, and the inclined portion 4 of the stopper claw 40 is formed.
Since 1 is formed only on the front side in the paper feed tray pull-out direction Y, when it is pushed toward the center in the paper feed transport direction X, the convex portion 4 is formed.
7 and V-shaped groove 49 are disengaged, and stopper claw 40 and engaging tooth 4
3a separates from each other, and slides symmetrically across the central axis in the sheet feeding and conveying direction X. However, when pushed in a direction away from the center of the sheet feeding / conveying direction X, the stopper claw 40 and the engaging tooth 43a engage and do not move. Therefore, when the side fences 15 and 19 are moved away from the center in the sheet feeding / conveying direction X, the upper portion of the stopper 39 is pinched and the stopper claw 40 is pulled.
And the engaging portion 43 are separated, and the side fences 15 and 19 are slid. At this time, the convex portion 47 and the V-shaped groove 49 are separated from each other by the force applied to the side fence 15. Further, since the side fences 15 and 19 are fixed by the click type stopper 46 in accordance with the rated paper size, the side fences 15 and 19 can be used as a guide when positioning.

As described above, since the stopper 39 is a claw-fixing type stopper, the side fences 15 and 19 can be positioned in accordance with the size of the sheet 32, and the sheet 32 and the side fences 15 and 19 can be positioned. A gap between them can be suppressed. Further, by fixing the side fence 19 with the stopper 39, the side fence 1 generated when the paper feed tray 1 is slid and set on the copying machine 21.
It is possible to prevent the movement of 9 toward the back side in the paper feed tray drawing direction Y. Therefore, by interlocking the side fences 15 and 19 and providing the stopper 39 at a position closer to the front side of the side fence 15 in the paper feed tray drawing direction Y, operability and fixing force can be improved, and The positions of the side fences 15 and 19 can be finely adjusted. Therefore, it is possible to obtain a stopper with good operability and obtain stable conveyance quality.

In this embodiment, the side fence 1
Although an example of application to the sheet feeding device in which the stoppers 39 and 46 are provided on the sheet feeding device 5 and 19 respectively, the present invention is not limited to such a configuration in the sheet feeding device according to claim 6, and, for example, a side device. The stopper 46 of the fence 15 may be omitted.

An embodiment of the present invention will be described with reference to FIG. In this embodiment, the side fence 15, which is connected by the rack 17 and the pinion gear 18,
It is a sheet feeding device in which a stopper is provided on either one of 16. A stopper 23 is provided on the stopper support portion 5 of the side fence 15. The rack 44 of the side fence 16 is provided with an engaging portion 27 at its front end in the paper feed tray drawing direction Y.

In such a structure, the side fences 15 and 16 are connected to each other by the rack 17 and the pinion gear 18, and the inclined portion of the stopper claw 24 is formed only on the front side in the sheet feeding tray drawing direction Y. Therefore, when pushed toward the center side in the sheet feeding / conveying direction X, the stopper claw 24 and the engaging tooth 27a are disengaged, and slide symmetrically across the central axis in the sheet feeding / conveying direction X. However, when pushed in the direction away from the center of the sheet feeding / conveying direction X, the stopper claw 24 and the engaging tooth 27a are engaged and do not move. Therefore, when the side fences 15 and 16 are moved away from the center in the sheet feeding / conveying direction X, the upper portion of the stopper 23 is pinched,
The stopper claw 24 and the engaging portion 27 are separated from each other, and the side fences 15 and 16 are slid.

As described above, since the stopper 23 is a claw-fixing type stopper, the side fences 15 and 16 can be positioned according to the size of the paper 32, and the space between the paper 32 and each side fence 15 and 16 can be determined. It is possible to suppress the gap. Further, by fixing the side fences 15 and 16 with the stopper 23, it is possible to prevent the side fence 15 from moving inward in the paper feed tray pull-out direction Y when the paper feed tray 1 is slid on the copying machine 21. be able to. Therefore, the side fences 15 and 16 are interlocked, the side fence 15 is provided with the stopper 23,
By providing the rack 44 with the engaging portion 27, engaging the stopper 23 with the engaging portion 27, and fixing the side fences 15 and 16, the operability and the fixing force can be improved, and The positions of the side fences 15 and 16 can be finely adjusted. Therefore, it is possible to obtain a stopper with good operability and obtain stable conveyance quality.

[0057]

According to the first aspect of the present invention, the convex portion of the fixed position fixed type stopper deeply engages with any one of the concave grooves of the first engaging portion to fix one side fence. As a result, the operability and the fixing force can be improved, and the stopper claw of the claw-fixing type stopper engages with an arbitrary part of the engaging teeth of the second engaging portion to secure the other side fence. By fixing, the position of the side fence can be finely adjusted, and the gap between the sheet and each side fence can be reduced. Therefore, when a stopper is provided on each of the pair of side fences, the paper can be positioned in accordance with the central axis in the paper feed / conveyance direction, and a stopper with good operability can be obtained, and the conveyance can be performed. Quality can be stabilized.

According to a second aspect of the present invention, the convex portion of the fixed-position fixed stopper is deeply engaged with any one of the concave grooves of the first engaging portion to fix the side fence on the back side. Due to
The operability and fixing force can be improved, the movement of the paper due to the impact when the paper feed tray is stored in the paper feed tray storage section can be prevented, and the stopper pawls of the pawl fixed stopper By engaging any part of the engaging teeth of the second engaging portion and fixing the front side fence, the position of the front side fence can be finely adjusted, and the paper and each side can be adjusted. The gap with the fence can be reduced. Therefore, when a stopper is provided on each of the pair of side fences, the paper can be positioned in accordance with the central axis in the paper feed / conveyance direction, and a stopper with good operability can be obtained, and the conveyance can be performed. Quality can be stabilized.

According to the invention of claim 3, the pitch of the first stopper claws and the pitch of the second stopper claws are different,
The stopper claw formed with a larger pitch engages with any part of the engaging teeth to fix one side fence, so that the fixing force can be improved, and further, it can be formed with a smaller pitch. The stopper claw engages with any part of the engaging teeth to fix the other side fence, so that the position of the side fence can be finely adjusted, and the gap between the paper and each side fence can be reduced. In addition, it is possible to improve the operability by connecting the side fence having the claw-fixing type first stopper and the side fence having the claw-fixing type second stopper at the connecting portion. it can. Therefore, when a stopper is provided on each of the side fences connected by the rack and the pinion, both operability and fixing force can be improved and fine adjustment of the side fence can be performed together, and a stopper with good operability can be provided. In addition, it is possible to obtain stable quality.

Since the pitch of the second stopper claw is larger than the pitch of the first stopper claw, the second stopper claw of the second claw-fixing type stopper has a second stopper claw. The fixing force can be improved by engaging any part of the engaging teeth of the engaging portion and fixing the side fence on the back side, and the paper feed tray is stored in the paper feed tray storage portion. It is possible to prevent the movement of the paper due to the impact at the time, and further, the first stopper claw of the first claw-fixing type first stopper engages with any part of the engaging teeth of the first engaging portion. By fixing the side fence on the front side, the position of the side fence can be finely adjusted, the gap between the paper and each side fence can be reduced, and a claw fixing type first stopper is provided. Front side fence and claw-fixed second By connecting the rear side of the side fence provided with stopper at the junction, it is possible to improve the operability. Therefore, when a stopper is provided on each of the side fences connected by the rack and the pinion, both operability and fixing force can be improved and fine adjustment of the side fence can be performed together, and a stopper with good operability can be provided. In addition, it is possible to obtain stable quality.

According to the fifth aspect of the present invention, since the inclined portion of the first stopper pawl and the inclined portion of the second stopper pawl are both facing the front side of the paper feed tray accommodating portion, the front side of the connecting portion is located. By connecting the side fence and the back side fence, the first stopper claw engages with any part of the engaging teeth of the first engaging portion to fix the front side fence, and The force that pushes the side fence on the side toward the back side of the paper feed tray storage section acts to reduce the gap between the paper and each side fence, and further, the second stopper claw is used for the second engagement section. By engaging any part of the engaging teeth and fixing the back side fence, it is possible to prevent the movement of the paper due to the impact when the paper feed tray is stored in the paper feed tray storage portion, The front side service provided with a claw fixed type first stopper. By connected by a connecting portion and a rear side of the side fence provided with a second stopper Dofensu and nails fixed, it is possible to improve the operability. Therefore, when a stopper is provided on each of the side fences connected by the rack and the pinion, both operability and fixing force can be improved and fine adjustment of the side fence can be performed together, and a stopper with good operability can be provided. In addition, it is possible to obtain stable quality.

According to a sixth aspect of the present invention, the stopper claw of the claw-fixing type stopper engages with an arbitrary portion of the engaging teeth of the engaging portion to fix the side fence on the back side, thereby providing a paper feed tray. Paper can be prevented from moving due to impact when the paper is stored in the paper tray storage section, and the position of the side fence can be finely adjusted to reduce the gap between the paper and each side fence. In addition, the claw-fixing type stopper is placed in front of the front side fence, and the front side fence and the rear side fence are connected at the connecting part, so operability can be improved. . Therefore, when a stopper is provided on one of the side fences connected by the rack and the pinion, it is possible to obtain a fixing force sufficient to prevent displacement of the stop position of the side fence, and obtain a stopper with good operability. In addition, the transport quality can be stabilized.

According to a seventh aspect of the present invention, the stopper claw of the claw-fixing type stopper engages an arbitrary portion of the engaging teeth of the engaging portion to fix the side fence on the rear side, and the convex portion engages. By fixing the side fence on the front side by engaging with the side portion, it is possible to more reliably prevent the movement of the paper due to the impact when the paper feed tray is stored in the paper feed tray storage portion, and also the side fence. The position of can be finely adjusted to reduce the gap between the paper and each side fence, and the stopper of the side fence on the front side can be used as a click-type stopper, and the stopper of the claw fixing type can be used on the front side. Since it was placed in front of the side fence, and the side fence on the front side and the side fence on the back side were connected at the connecting part,
The operability can be improved. Therefore, when a stopper is provided on one of the side fences connected by the rack and the pinion, it is possible to obtain a fixing force sufficient to prevent displacement of the stop position of the side fence, and obtain a stopper with good operability. In addition, the transport quality can be stabilized.

According to the eighth aspect of the present invention, the pair of side fences are connected by the connecting portion, and the stopper claw provided on one side fence is engaged with the engaging claw provided on the other side fence. By fixing the fence, the operability and the fixing force can be improved, and the position of the side fence can be finely adjusted to reduce the gap between the paper and each side fence.
Therefore, when a stopper is provided on one of the side fences connected by the rack and the pinion, it is possible to obtain a fixing force sufficient to prevent displacement of the stop position of the side fence, and obtain a stopper with good operability. In addition, the transport quality can be stabilized.

[Brief description of drawings]

FIG. 1 is a partially cutaway plan view showing a stopper of a side fence according to an embodiment of the invention described in claims 1 and 2. FIG.

FIG. 2 is a perspective view showing a copying machine including the paper feeding device of the present embodiment.

FIG. 3 is a partially cutaway perspective view showing a side fence of the paper feed tray.

FIG. 4 is a perspective view showing a stopper of one side fence.

FIG. 5 is a perspective view showing a stopper of the other side fence.

FIG. 6 is a partially cutaway plan view showing an embodiment of the invention described in claims 3 and 4. FIG.

FIG. 7 is a partially cutaway plan view showing an embodiment of the invention according to claim 5;

FIG. 8 is a partially cutaway plan view showing an embodiment of the invention described in claims 6 and 7. FIG.

FIG. 9 shows a click-type stopper according to an embodiment of the invention as set forth in claim 7, (a) is a perspective view and (b) is a plan view.

FIG. 10 is a partially cutaway plan view showing an embodiment of the invention as set forth in claim 8;

FIG. 11 is a plan view showing a conventional paper feed tray.

FIG. 12 is a partially cutaway plan view showing a stopper of a side fence of the paper feed tray.

FIG. 13 is a plan view showing another conventional paper feed tray.

FIG. 14 is a partially cutaway plan view showing a stopper of a side fence of the paper feed tray.

FIG. 15 is a plan view showing still another paper feed tray.

FIG. 16 is a partially cutaway plan view showing a stopper of a side fence of the paper feed tray.

[Explanation of symbols]

 1 Paper Feed Tray 3, 4, 15, 16, 19 Side Fence 17, 44 Rack 18 Pinion 20 Paper Feeder 22 Paper Feed Tray Storage 23, 33, 36, 39 Claw Fixed Stopper 24, 34, 37, 40 , 47 Stopper claw 25 Fixed position fixed stopper 26, 46 Convex part 27, 28, 35, 42, 43, 46 Engaging part 27a, 35a, 42a, 43a Engaging tooth 29, 49 Recessed groove 32 Paper 38, 41 Inclined part 46 Click type stopper

Claims (8)

[Claims] 1. A paper feed tray on which paper is stacked, a pair of left and right side fences which are positioned on the paper feed tray in the left-right direction with respect to the paper feed and conveyance direction of the paper, and a paper size. A first engaging portion in which a deep groove is formed at each fixed position determined according to the above, and a convex provided in one of the side fences and selectively engaged in any of the groove. Fixed position fixed type stopper having a portion and biased in the engaging direction, and a second engaging portion in which engaging teeth are formed at a fine constant pitch over the sliding range of the side fence, The other side fence is provided with a pawl fixing type stopper that has a stopper pawl that selectively engages an arbitrary portion of the engaging tooth and is urged in the engaging direction. And a paper feeder. 2. A paper feed tray in which paper is stacked and is stored in a paper feed tray storage section in a direction orthogonal to the paper feed / transport direction of the paper, and the paper feed / transport of the paper on the paper feed tray. A pair of side fences that are slidable in the left-right direction and are positioned in the left-right direction with respect to the direction, and first engaging portions in which deep concave grooves are formed at fixed positions determined according to the paper size, respectively. A fixed-position fixed stopper that is provided in the back side fence and has a convex portion that selectively engages with any of the concave grooves and that is biased in the engaging direction,
A second engaging portion having engaging teeth formed over the sliding range of the side fence at a fine constant pitch, and a second engaging portion provided on the side fence on the front side and selectively in any part of the engaging teeth. And a stopper fixed type stopper that is biased in the engaging direction and that has a stopper claw that engages with the sheet feeding device. 3. A paper feed tray for stacking paper sheets, and a pair of side fences slidable in the left and right direction for positioning the paper sheets on the paper feed tray in the left and right direction with respect to the paper feed and conveyance direction. A connecting portion for connecting the side fence to the rack and the pinion, and engaging teeth formed at a constant pitch over the sliding range of the side fence.
And the first engaging portion provided on the one side fence and selectively engaging any portion of the engaging teeth.
The first stopper of the claw fixed type having the stopper claw biased in the engaging direction and the engaging teeth of the side fence at a constant pitch different from the engaging teeth of the first engaging portion. Engagement with a second engaging portion formed over the sliding range and a second stopper claw provided on the other side fence and selectively engaging any part of the engaging tooth A sheet feeding device, comprising: a claw-fixing type second stopper that is biased in the direction. 4. A paper feed tray in which paper is loaded and is housed in a paper feed tray accommodating section in a direction orthogonal to the paper feed and conveyance direction of the paper, and the paper feed and conveyance of the paper on the paper feed tray. A pair of side fences that are slidable in the left-right direction for positioning in the left-right direction with respect to the direction, a connecting portion that connects these side fences with a rack and a pinion, and engaging teeth at a constant pitch of the side fence. It has a first engaging portion formed over the sliding range and a first stopper claw provided on the front side fence and selectively engaged with an arbitrary portion of the engaging tooth. A claw-fixing type first stopper urged in the engaging direction and engaging teeth are formed over the sliding range of the side fence at a pitch larger than the engaging teeth of the first engaging portion. Second
Second engaging part and a second part that is provided on the back side fence and selectively engages with any part of the engaging tooth.
And a second stopper of a claw fixed type having a stopper claw urged in the engagement direction. 5. A paper feed tray for accommodating paper and accommodating the paper in a paper feed tray accommodating section in a direction orthogonal to the paper feed and conveyance direction of the paper, and the paper feed and conveyance of the paper on the paper feed tray. A pair of side fences that are slidable in the left-right direction for positioning in the left-right direction with respect to the direction, a connecting portion that connects these side fences with a rack and a pinion, and engaging teeth at a constant pitch of the side fence. It has a first engaging portion formed over the sliding range and a first stopper claw provided on the front side fence and selectively engaged with an arbitrary portion of the engaging tooth. An inclined portion of the first stopper claw is formed toward the front side of the paper feed tray accommodating section, and a claw-fixing-type first stopper biased in the engaging direction and engaging teeth at a constant pitch. Is the side fence sly And a second stopper claw provided on the back side fence and selectively engaged with an arbitrary portion of the engaging tooth. A sheet feeding device comprising: a second stopper, which is a claw-fixing type, in which an inclined portion of the second stopper claw is formed toward the front side and is biased in the engaging direction. 6. A paper feed tray in which paper is stacked and accommodated in a paper feed tray accommodating portion in a direction orthogonal to the paper feed and conveyance direction of the paper, and the paper feed and conveyance of the paper on the paper feed tray. A pair of side fences that are slidable in the left-right direction for positioning in the left-right direction with respect to the direction, a connecting portion that connects these side fences with a rack and a pinion, and engaging teeth at a constant pitch of the side fence. The side fence on the front side having an engaging portion formed over the sliding range and a stopper claw provided on the side fence on the far side and selectively engaging with any part of the engaging teeth. A paper feeding device, comprising: a claw-fixing type stopper that is disposed on the front side of the claw and is biased in the engagement direction. 7. A paper feed tray in which paper is loaded and is housed in a paper feed tray accommodating section in a direction orthogonal to the paper feed and conveyance direction of the paper, and the paper feed and conveyance of the paper on the paper feed tray. A pair of side fences that are slidable in the left-right direction for positioning in the left-right direction with respect to the direction, a connecting portion that connects these side fences with a rack and a pinion, and engaging teeth at a constant pitch of the side fence. The first engagement portion formed over the sliding range and the stopper claw provided on the back side fence and selectively engaged with an arbitrary portion of the engagement tooth are provided on the front side. A pawl-fixing type stopper arranged on the front side of the side fence and biased in the engaging direction, and a second engaging member having a shallow groove formed at each fixed position determined according to the paper size. Joint and front side A fixed position fixed type click type stopper provided on the side fence and biased in the engaging direction with a convex portion that selectively engages with any of the concave grooves is provided. Characteristic paper feeding device. 8. A paper feed tray for stacking paper sheets, and a pair of side fences slidable in the left-right direction for positioning the paper sheets on the paper feed tray in the left-right direction with respect to the paper feed and conveyance direction thereof. A connecting portion that connects the side fence with a rack and a pinion, and an engaging portion that is provided on one of the side fences and has engaging teeth formed at a constant pitch over the sliding range of the side fence,
The other side fence is provided with a pawl fixing type stopper that has a stopper pawl that selectively engages an arbitrary portion of the engaging tooth and is urged in the engaging direction. And a paper feeder.