JP3000581U - Paper feeder - Google Patents

Abstract

(57) [Summary] [Purpose] When handling large-sized paper in a copier, printer, or paper folding machine, it is possible to prevent skewing of the paper and to stably feed curled paper. Provided is a paper feeding device capable of preventing occurrence of jams and the like. [Structure] A bundle of sheets placed on a sheet feeding plate 11 is positioned with both side edges thereof aligned by side edge guides 12 on the sheet feeding plate 11. A lever mounting plate 13 is fixed to the side edge guide 12, and a support shaft 14 fitted in the elongated hole 13a is movable along the elongated hole 13a. The lever 15 is rotatable about the support shaft 14, and a roller 17 is pivotally supported by a free end portion of the lever 15 via a support shaft 16. Then, the rollers 17 roll on both side edges of the sheet bundle.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a paper feeding device capable of handling large-sized paper in a copying machine, a printing machine, a paper folding machine, or the like.

[0002]

[Prior art]

 When copying a large size paper that is a copy of a drawing, etc., it is generally folded to A4 size. Then, a punch hole is formed at a predetermined position on the sheet, and the sheet is bound into the file through the punch hole. In the folded state, sheets of A0 to A2 size are inconvenient for binding because the punch holes are closed. Therefore, normally, the edge of the paper is folded in a triangle so as to avoid the punch hole or the edge is notched beforehand. ing.

On the other hand, a sheet feeding device such as a drawing folder that folds a large size sheet is provided with a side edge guide for positioning the stacked sheets on the sheet feeding plate in order to handle various sizes A0 to A3. ing.

[0004]

[Problems to be solved by the device]

 However, when feeding a large size paper, even if the paper is configured to be fed along the side edge guide, a slight skew occurs while the paper is conveyed to the folding rollers, As a result, a misalignment occurs. In addition, if the short edge side of a large size sheet is placed along the side edge guide and the long edge side is fed first, the skew feeding tends to be even larger.

Further, after copying, a curl is often formed on the side edge portion and the leading end portion. Especially, when the leading end portion in the sheet feeding direction is curled, the leading end portion of the paper is fed. There is a problem in that the roller shaft and the guide plate that guides the feeding of paper, etc. are caught and a jam occurs, and the machine must be stopped.

Furthermore, when an upward curl is formed on the side edge of the sheet, the side edge of the sheet curled upward rides on the side edge guide, causing skew of the sheet. There is.

The present invention has been made in view of the above problems, and provides a sheet feeding device capable of preventing the sheet from skewing, stably feeding the sheet even when curled, and preventing the occurrence of a jam. The purpose is to provide.

[0008]

[Means for Solving the Problems]

 The sheet feeding device according to the present invention is a sheet feeding device that separates and feeds sheets one by one by rotating a sheet feeding roller from a sheet stack placed on the sheet feeding table. A pair of side edge guides for aligning and positioning both side edges of the placed sheet bundle, and the sheet by rotating about an axis provided in each of the side edge guides and parallel to the rotation axis of the sheet feeding roller. It is characterized by having a roller rolling on the upper surface of the bundle.

Further, a supporting shaft is attached to each of the side edge guides, and a lever rotatable about the supporting shaft as a rotation axis in a plane perpendicular to the rotation axis of the sheet feeding roller is attached to the roller, It may be rotatably attached to the free end of the lever.

Further, a support member having an elongated hole extending in the sheet feeding direction of the paper is fixed to each of the side edge guides, fitted in the elongated hole, and a lever is provided on a support shaft that is movable in the longitudinal direction. One end of the lever may be attached and the other end of the roller may be rotatably attached so that the lever can rotate in a plane perpendicular to the rotation axis of the sheet feeding roller with the spindle as the rotation axis.

[0011]

[Action]

 In the present invention, the sheet bundle is aligned on both side edges by the side edge guides on the sheet feeding plate, and both side edges are positioned. Then, as the paper feed roller rotates, the paper is fed one by one due to the frictional force between the paper and the paper feed roller. In this case, the rollers rotate about an axis parallel to the rotation axis of the sheet feeding roller and roll-contact with the upper surface of the sheet bundle, so that both side edges of the sheet bundle are pressed by the rollers. For this reason, even if there are curls on both side edges or the leading edge of the sheet, the sheet is smoothly fed without coming into contact with the roller shaft or riding on the side edge guide.

When the paper feed roller is made of a material such as rubber, a slight runout or the like occurs during paper feed, and the paper feed roller rotates in a perfect cylindrical shape around its rotation axis. Do not mean. Therefore, a pressure difference may occur on the tangent line between the paper feed roller and the paper, which causes skew of the paper. In this case, skewing of the paper can be prevented by setting the position where the roller contacts the paper to an appropriate position as described in claims 2 to 4.

Further, even when the size of the paper is changed, since the rollers are attached to the side edge guides, it suffices to move the side edge guides, and the work accompanying the change of the paper size is simple. Is.

[0014]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 to 5 are schematic views showing an embodiment in which the present invention is applied to a drawing folding machine. It should be noted that in FIGS. 1 and 3, the sheet is indicated by the symbol P and is indicated by a chain double-dashed line. A bundle of sheets to be folded is placed on the paper supply plate 11 of the drawing folder 10. A paper feed roller 25 is arranged downstream of the paper feed plate 11 in the paper feed direction. The paper feed roller shaft 25a of the paper feed roller 25 is fixed to a paper feed bracket (not shown) provided in the apparatus housing. The paper feeding roller 25 is rotationally driven by a driving device (not shown) via the paper feeding roller shaft 25a.

A sorting base 29 is disposed below the sheet feeding roller 25, and a first transport guide 30 is provided on the upper surface of the sorting base 29 so that the sheet P is fed from the sheet feeding plate 11. The sheet is guided by the first transport guide 30 and reaches the sheet feeding roller 25. A separating plate (friction plate) 28 provided on a swinging member (not shown) swingably supported by a separating base 29 is arranged at the front end portion of the first transport guide 30. There is. The separating plate 28 is arranged so as to come into contact with the peripheral surface of the sheet feeding roller 25 from below, and is pressed toward the sheet feeding roller 25 by an appropriate urging force by an urging member (not shown). There is. As a result, the plurality of sheets P on the first transport guide 30 are taken out one by one with the separation plate 28 by the rotation of the paper feed roller 25, and are sent out one by one from the paper feed roller 25. The materials and the like of the paper feed roller 25 and the separating plate 28 are set to appropriate ones in consideration of the frictional force on the paper P.

A pair of first conveying rollers 33a and 33b facing each other in the vertical direction are arranged on the downstream side of the sheet feeding roller 25 in the sheet feeding direction with their rotation axes being horizontal and parallel to each other. The sheet P conveyed by the sheet feeding roller 25 is sandwiched by the first conveying rollers 33a and 33b, and is forwarded by its rotation.

A pair of second transport guides 36a, 36b curved in an L shape are arranged on the downstream side of the first transport rollers 33a, 33b in the sheet feeding direction so as to face each other with a gap therebetween. The paper P changes its paper feed direction from horizontal to vertical while passing through the second conveyance guides 36a and 36b.

A pair of second conveying rollers 35a, 35b facing each other in the horizontal direction are arranged in the vicinity of the front ends of the second conveying guides 36a, 36b in the sheet feeding direction with their rotation axes being horizontal and parallel to each other. Has been done. As a result, the paper P delivered from the second transport guides 36a and 36b is pinched by the second transport rollers 35a and 35b, and by its rotation, it is delivered to a paper folding pocket (not shown) arranged below it. Be paid.

On the other hand, upstream of the paper feed roller 25 in the paper feed direction and above the end of the paper feed plate 11, an auxiliary paper feed roller 26 has its rotation axis parallel to the rotation axis of the paper feed roller 25. It is located in The auxiliary paper feed roller 26 is configured to press the paper P at a predetermined paper feed pressure by a paper feed pressure adjusting means (not shown). A pulley 25b and a pulley 26b are fitted to the paper feed roller shaft 25a and the auxiliary paper feed roller shaft 26a, respectively, and a timing belt 27 is stretched between these pulleys 25b and 26b. . As a result, when the paper feed roller 25 is rotationally driven, the auxiliary paper feed roller 26 is driven to rotate.

A pair of side edge guides 12 are provided on both side edges of the sheet feeding plate 11. Further, both end portions of the paper feed plate 11 project slightly downward, and both ends of the slide shaft 20 are fixed to the downward projecting portions. The slide shaft 20 is arranged parallel to the rotation shaft 25a of the paper feed roller 25 at the center of the paper feed plate 11 in the paper feed direction.

At a position aligned with the slide shaft 20 of the sheet feeding plate 11, a pair of notches 11a and 11b cut from the side edge to the vicinity of the center are formed with an appropriate width, and the notches 11a and 11b. Thus, the slide shaft 20 arranged below the paper feed plate 11 is exposed above it. A pair of slide blocks 19 are fitted on the slide shafts 20, and a mounting plate 18 is fixed to each slide block 19. The mounting plate 18 projects above the sheet feeding plate 11 through the notches 11a and 11b, and a screw hole (not shown) into which the fixing knob 21 is screwed is provided on the upper edge of the mounting plate 18. As a result, the side edge guide 12 is sandwiched between the fixing knobs 21 and screwed into the screw holes of the mounting plate 18, and the side edge guides 12 are tightened to the mounting plate 18 by tightening the fixing knobs 21. The side edge guide 12 frictionally engages with the sheet feed plate 11 and the slide shaft 20 to fix them.

A lever mounting plate 13 is erected at the front end of each of the side edge guides 12, and the lever mounting plate 13 is provided with an elongated hole 13a parallel to the sheet feeding direction. The threaded portion 14a of the support shaft 14 is inserted into the elongated hole 13a of the lever mounting plate 13, and a hexagon nut (not shown) or the like is screwed into the threaded portion 14a so that the elongated hole 13a It does not fall out. As a result, the support shaft 14 can move in the paper feeding direction along the lever mounting plate 13. Further, the support shaft 14 can be fixed to the lever mounting plate 13 by tightening the hexagon nut.

One end of a lever 15 is pivotally supported on the support shaft 14, and the lever 15 can rotate with the support shaft 14 as a center. A support shaft 16 parallel to the support shaft 14 is provided at the other end of the lever 15, that is, a free end portion, and a roller 17 is rotatably attached with the support shaft 16 as a rotation shaft. As a result, the roller 17 is positioned with a slight gap between the roller 17 and the side edge guide 12, and the support shaft 16 parallel to the rotation axis of the paper feed roller 25 rotates about the rotation axis to rotate the paper feed plate 11. Roll on both edges of the upper stack. As shown in FIG. 3, when the lever 15 is rotated so that the roller 17 is located forward in the sheet feeding direction, the roller 17 is located on an extension of the rotation shaft 26a of the auxiliary sheet feeding roller 26.

Next, the operation of this embodiment will be described. The sheet bundle is placed on the sheet feeding plate 11, the knob 21 is loosened, the side edge guide 12 is brought into contact with the side edge of the sheet bundle, and the widthwise position of the sheet bundle is adjusted. Then, the knob 21 is tightened to fix the side edge guide 12 to the sheet feeding plate 11, the roller 17 is positioned forward of the support shaft 14 in the sheet feeding direction, and brought into contact with the side edge portion of the sheet bundle. Then, the paper feed roller shaft 25a is rotationally driven to rotationally drive the paper feed roller 25 and the auxiliary paper feed roller 26.

Then, the plurality of sheets P are sent forward from the bundle of sheets on the sheet feeding plate 11 by the rotation of the auxiliary sheet feeding roller 26. These sheets P slide on the first transport guide 30 and move to the rolling contact position between the paper feed roller 25 and the separating plate 28, and are separated one by one by the separating plate 28 and are rotated by the rotation of the paper feeding roller 25. Sent forward. Then, each sheet P is fed to the paper folding section by the first transport rollers 33a and 33b, the second transport guides 36a and 36b, and the second transport rollers 35a and 35b.

In this case, in the present embodiment, since the pair of rollers 17 roll on both side edge portions of the sheet bundle, even if the side edge portions of the sheet P are curled, the curl is generated. The paper P is kept pressed by the rollers 17 so that the paper P does not go over the side edge guides 12 and protrude laterally, and the side edges of the paper P are always regulated by the side edge guides 12 so that the paper feed roller 25 moves in parallel to the paper feeding direction. As a result, the sheet P is prevented from being skewed and jams are prevented.

The paper P placed on the paper feed plate 11 is fed from the paper feed roller 25 and the auxiliary paper feed roller 26 by the frictional force applied to the paper P. Since the la 26 is usually made of a material such as rubber, some runout may occur. In this case, even if the sheet feeding roller 25 and the auxiliary sheet feeding roller 26 are located at the center position with respect to the both side edge guides 12 on the sheet feeding plate 11, both ends of the contact line between the sheet P and the sheet feeding roller 25 and A slight difference in the frictional force occurs at both ends of the contact line between the paper P and the auxiliary paper feed roller 26, and the force with which the paper P is fed differs depending on the position of the paper P in the width direction. Due to this, skewing of the paper P may occur.

A method for preventing skew of the sheet in such a case will be described with reference to FIGS. 6 and 7. 6 and 7, two-dot chain lines 40 and 41 indicate sheet positions. Usually, the roller 17 is arranged on the extension line of the rotation shaft of the auxiliary paper feed roller 26 at the front end of the paper feed plate 11. However, the lever 15 is rotatable around the support shaft 14, and since the support shaft 14 can move along the elongated hole 13a of the lever mounting plate 13, the position where the roller 17 contacts the paper can be freely set. Can be adjusted. Therefore, by adjusting the position of the roller 17, the position at which the roller 17 presses against the paper and exerts a frictional force is changed, whereby the force at which the paper is fed is adjusted at both edges. In this way, the force with which the paper is fed can be made equal on both edges of the paper to prevent skewing of the paper.

Specifically, as shown in FIG. 6, when the paper is fed while the leading edge of the paper is held in parallel with the paper feed roller shaft 25a, the paper is normally fed. However, factors such as the runout of the paper feed roller 25 and the auxiliary paper feed roller 26, the form of the paper 40 (paper size and thickness), and the state of curl (direction of curl and amount of curl), etc. Thus, when the sheet skews to the right as shown by the chain double-dashed line 41, the roller 17 on the right side in the sheet feeding direction is positioned rearward in the sheet feeding direction. That is, the lever 15 is rotated about the support shaft 14 to rotate the roller 17 to a position 17a shown in FIG. 6, and the roller 17 is brought into contact with the paper at this position, so that the paper skews. Can be prevented.

Further, the hexagon nut screwed to the threaded portion of the support shaft 14 is loosened to move the lever 15 and the roller 17 along the elongated hole 13a of the lever mounting plate 13 in the upstream direction of the sheet feeding direction, Even if the roller 17 is moved to a position 17b and the roller 17 is brought into contact with the paper at this position, the skew of the paper 40 can be prevented.

On the other hand, when the curl of the paper is large, when the roller 17 is moved to the position indicated by reference numeral 17a or 17b, the distance between the leading end of the paper and the position pressed by the roller 17 becomes long. Therefore, the leading end of the sheet is largely displaced upward, and there is a possibility that the sheet may come into contact with the sheet feeding roller shaft 25a or the like to be bent or jammed. Therefore, in this case, as shown in FIG. 7, the lever 15 and the roller 17 on the left side in the sheet feeding direction are moved to the downstream side (that is, the front) in the sheet feeding direction, and the roller 17 is moved to the position indicated by the reference numeral 17c. The roller 17 is brought into contact with the paper at this position. This makes it possible to prevent the paper from skewing.

On the other hand, when changing the size of the paper, the fixing knob 21 is loosened and the mounting plate 18 is loosened from the slide shaft 20. Then, by adjusting the position of the side edge guide 12 together with the mounting plate 18 and the slide block 19 in the paper width direction, the lever 15 also moves simultaneously, so that the paper size can be easily changed.

In this embodiment, both side edge guides on the sheet feeding plate can be moved, but one side edge guide is a fixed side edge guide that is fixed as a reference for sheet feeding, and only the other side edge guide is used for sheet feeding. Even if it can be moved according to the size of, the same effect can be obtained. At this time, the positions of the sheet feeding roller and the auxiliary sheet feeding roller may be provided at the center of the sheet feeding plate in the width direction or near the fixed side edge guide.

Further, although the present embodiment is a paper feeding device applied to a paper folding machine, the present invention can also be applied to a copying machine or a printing machine.

[0035]

[Effect of device]

 According to the present invention, since the roller comes into contact with the side edge of the sheet to be fed, even if the sheet is curled, the leading edge of the sheet comes into contact with the shaft of the sheet feeding roller or the like and a corner is bent or a jam occurs. Moreover, since the paper is always regulated by the side edge guide, the side edge of the paper does not ride on the side edge guide and the skew does not occur. Furthermore, when skew occurs due to the runout of the paper feed roller or the like, as described in claims 2 to 4, the position where the roller contacts the paper is adjusted to increase the force for feeding the paper. Skew can be prevented by adjusting the width of both sides of the paper. Furthermore, since the rollers are supported by the side edge guides, when changing the paper size, the rollers can be brought into contact with the side edges of the paper simply by moving the side edge guides.

[Brief description of drawings]

FIG. 1 is a side view showing a sheet feeding device according to an embodiment of the present invention.

FIG. 2 is a perspective view of the same.

FIG. 3 is a top view of the same.

FIG. 4 is a partially enlarged top view of the same.

FIG. 5 is a partially enlarged side view of the same.

FIG. 6 is a top view showing an example of a method for preventing skewing of a sheet in this embodiment.

FIG. 7 is a top view showing another example of the method for preventing the skew of the sheet in this embodiment.

[Explanation of symbols]

 10; Drawing Folding Machine 11; Paper Feed Plate 12; Side Edge Guide 13; Lever Mounting Plate 13a; Long Holes 14, 16; Spindle 15; Lever 17; Rollers 17a, 17b, 17c; Position of Rollers after Movement 18; Mounting Plate 19; Slide Block 20; Slide Shaft 25; Paper Feed Roller 25a; Paper Feed Roller Shafts 25b, 26b; Pulley 26; Auxiliary Paper Feed Roller 26a; Auxiliary Paper Feed Roller Shaft 27; Timing Belt 28; Separation Board 29; Separation base 30; first transport guides 33a and 33b; first transport rollers 35a and 35b; second transport rollers 36a and 36b; second transport guide P; sheets 40 and 41; two-dot chain line indicating sheet position

Claims (4)

[Scope of utility model registration request] 1. A sheet feeding device for separating and feeding sheets one by one from a bundle of sheets placed on the sheet feeding table by rotation of a sheet feeding roller, and a sheet placed on the sheet feeding table. A pair of side edge guides for aligning and positioning both side edges of the stack and a pair of side edge guides, which rotate around an axis provided in each side edge guide and parallel to the rotation axis of the sheet feeding roller, and roll-contact with the upper surface of the sheet stack A paper feeding device having a roller. 2. The roller has a support shaft attached to each of the side edge guides, and a lever rotatable about the support shaft in a plane perpendicular to the rotation shaft of the paper feeding roller. The paper feeding device according to claim 1, wherein the paper feeding device is rotatably attached to a free end portion of the lever. 3. A support member fixed to each of the side edge guides and having an elongated hole extending in the sheet feeding direction of the sheet, a support shaft fitted in the elongated hole and movable in the longitudinal direction, and one end The sheet feeding device according to claim 1, further comprising a lever attached to the support shaft and the other end of which is rotatably attached to the roller. 4. The sheet feeding device according to claim 3, wherein the lever is rotatable in a plane perpendicular to the rotation axis of the sheet feeding roller with the support shaft as a rotation axis.