JPH04286553A - Paper feeding device - Google Patents

Abstract

PURPOSE:To supply sheets after performing positive one sheet separation regardless of the change of paper feeding torque. CONSTITUTION:There is provided a separation roller 1 brought into contact with the uppermost sheet A and rotated intermittently in the paper feeding direction and in the reverse direction, and the separation roller 1 is provided, at its outer peripheral surface, with a friction face 1c and a cutout recessed part 1d with which the paper feeding direction front edge A1 of an uppermost sheet A transferred/curved in association with the rotation of the friction face 1c. A pressing roller 5a for pressing the uppermost sheet A to the stacking base B side is further provided on the anti-paper feeding direction side of the separation roller 1, and a paper feed roller 2 continuously rotated in the paper feeding direction interlockingly with the intermittent rotation of the separation roller 1 performs approaching/separating motion to the outer peripheral surface of the separation roller 1 with the uppermost sheet A held in between.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feeding device that separates and feeds sheets stacked on a stacking table one by one as a paper feeding roller rotates.

0002

2. Description of the Related Art Conventionally, this type of paper feeding device has, for example, provided a paper feeding roller and a reverse roller which is supported by a torque limiter in an opposed manner, and as the paper feeding roller rotates, the paper feeding roller There is one sheet between the reverse roller
When only one sheet has been fed, the torque of the torque limiter is overcome by the frictional force between the sheets, and the reverse roller is rotated in the paper feeding direction, allowing one sheet to be fed out smoothly, and two or more sheets to be fed in. Sometimes, the torque of the torque limiter overcomes the frictional force between the sheets, causing the reverse roller to rotate in the opposite direction to the paper feeding direction and return the lower sheet.
Some machines prevent double feeding by continuing this operation until the topmost sheet is fed out.

0003

[Problem to be Solved by the Invention] However, in such a paper feeding device, due to a change in paper feeding torque, the lower sheet is moved in the opposite direction to the paper feeding direction and separated one by one, so that the sheet may be folded. In such a case, it is not possible to reliably separate one sheet, and since a torque limiter and a bearing are used for the reverse roller, there is a problem that the cost is high.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional circumstances, it is an object of the present invention to feed paper after reliably separating one sheet irrespective of changes in paper feeding torque.

[0005]

[Means for Solving the Problems] The technical means taken by the present invention to solve the above problems is to provide a sorting roller that is in contact with the uppermost sheet and rotates intermittently in a direction opposite to the paper feeding direction. A friction surface is provided on the outer circumferential surface of the sorting roller, and a notched recess that engages with the front edge in the paper feeding direction of the uppermost sheet that is transferred and curved as the friction surface rotates. A pressing means is provided to press the top sheet toward the stacking table, and the paper feed roller, which rotates continuously in the paper feeding direction in conjunction with the intermittent rotation of the separation roller, is used to sandwich the top sheet against the outer circumferential surface of the separation roller. It is characterized by moving towards and away from each other.

[0006]

[Operation] According to the above-mentioned technical means, the present invention rotates the friction surface of the sorting roller intermittently in the opposite direction to the paper feeding direction, so that the portion of the uppermost sheet up to the position pressed by the pressing means is The uppermost sheet is shifted in the paper feeding direction and curved in a direction away from the lower sheet, and as a result of subsequent rotation, the front edge of the curved uppermost sheet in the paper feeding direction engages with the notch recess.
The paper is turned over onto a sorting roller, and then a paper feed roller approaches the uppermost sheet on the sorting roller, and the rotation of the paper feed roller feeds out the uppermost sheet in the paper feeding direction.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In this embodiment, as shown in FIG. 1, a loading table B is arranged in an inclined manner, along which a large number of sheets A are stacked, and the uppermost sheet A is brought into contact with the sorting roller 1.
A pressing roller 5a is provided as the pressing means 5, and an elastic member 6, such as a spring, for pressing the sheet A in the stacking direction is connected to the stacking table B to feed the sheets A. Even if the height of the stacked sheets A becomes lower, the uppermost sheet A is always moved to the sorting roller 1 and the presser roller 5.
It is brought into contact with a.

The sorting roller 1 has an intermittent rotating shaft 1a inserted through its center, which is perpendicular to the paper feeding direction, and is arranged so that the uppermost sheet A
The front edge A of the topmost sheet A in the paper feeding direction is
The intermittent rotating shaft 1a is connected to an intermittent drive unit 1b such as a motor at a position a predetermined distance away from the top sheet A in the opposite direction from the paper feeding direction, with a part of the outer circumferential surface in contact with the surface of the uppermost sheet A. In conjunction,
The intermittent drive unit 1b operates to rotate the separating roller 1a once in the opposite direction to the paper feeding direction, and the time required to feed one sheet A from the end of that rotation to the start of the next rotation. Leave a non-rotation time of approximately the same length or slightly longer.

[0009] On the outer peripheral surface of the sorting roller 1, a friction surface 1c having a large frictional resistance against the surface of the sheet A is provided.
The uppermost sheet A is formed to be shorter than the length up to the contact position with the friction surface 1c, and the uppermost sheet A
A notch recess 1d into which the front end edge A1 of the front end A1 fits and engages is provided.

In this embodiment, as shown in FIG. 1, the friction surface 1c is constructed by fixing a rubber sheet with an uneven surface to the outer peripheral surface of the sorting roller 1, and the outer peripheral surface other than the friction surface 1c is 1e is formed to be easy to slide on the surface of the sheet A, and the front end 1d' of the notch recess 1d in the rotational direction is formed in a straight line so that the front edge A1 of the uppermost sheet A is aligned with the notch recess 1d.
The rear end 1d'' is recessed in an arc shape to make it easier for the front edge A1 of the uppermost sheet A to be caught.

Further, the intermittent rotation shaft 1a is linked with a paper feed roller 2 via an interlocking member 4, which will be described later, and the paper feed roller 2 is brought into contact with the sorting roller 1 in conjunction with the intermittent rotation of the intermittent rotation shaft 1a. move away.

The paper feeding roller 2 has a continuous rotating shaft 2a inserted through its center supported by a swinging arm 3 so as to be able to swing toward and away from the sorting roller 2, and this continuous rotating shaft 2a is connected to a motor or the like. The paper feed roller 2 is continuously rotated in the paper feeding direction by the operation of the continuous drive part 2b.

The swinging arm 3 has an inverted L-shape on its side, and has a pivot 3 parallel to the intermittent rotation axis 1a at its intermediate bent portion 3a.
b is inserted through it and pivotally supported so as to be able to swing freely, and the continuous rotation shaft 2a of the paper feed roller 2 is supported parallel to the intermittent rotation shaft 1a at the tip of one half portion 3c that moves toward and away from the intermittent rotation shaft 1a. With,
In the other half, a long hole 3d is bored parallel to the pivot 3b.

In this embodiment, as shown in FIG. 2, two paper feed rollers 2 are fixed to a continuous rotation shaft 2a with the above-mentioned sorting roller 1 sandwiched between them, and an intermittent rotation shaft 1 is mounted opposite to each of these paper feed rollers 2.
Free rollers 1f are each pivotally attached to a.

The interlocking member 4 is composed of a crank 4a fixed to the intermittent rotation shaft 1a, and a crank arm 4b extending from the crank 4a to the elongated hole 3d of the swing arm 3. When 1a rotates once, the swinging arm 3 swings back and forth once.

Furthermore, an arm 5 is provided on one half 3c of the swinging arm 3.
A presser roller 5a constituting the pressing means 5 is pivoted to the lower end of the arm 5b so as to be rotatable in the paper feeding direction. By contacting the surface of the intermediate portion of the uppermost sheet A in the sheet feeding direction, the uppermost sheet A is always moved toward the loading platform B by the weight of the arm 5b and the presser roller 5a, regardless of the swinging of the swinging arm 3. to press.

Next, the operation of such a paper feeding device will be explained. First, in the initial state, as shown in FIG.
The front end of the friction surface 1c in the rotational direction is in contact with the topmost sheet A, the notch recess 1d is in a positional relationship farthest from the topmost sheet A, and the paper feed rollers 2, 2 are in contact with the free roller 1f.
, 1f, and is rotating in the paper feeding direction.

In this state, the friction surface 1c of the sorting roller 1
begins to rotate in the counter-feeding direction, the portion of the uppermost sheet A from the front edge A1 in the paper-feeding direction to the position pressed by the presser roller 5a is shifted in the counter-feeding direction to the two points in FIG. As shown by the chain line, the sheet A' gradually curves away from the lower sheet A', and at the same time, the swinging arm 3 swings and the paper feed rollers 2,
2 begins to move away from the free rollers 1f, 1f.

3 due to the subsequent rotation of the sorting roller 1.
As shown in , by the time the rear end of the friction surface 1c in the rotational direction comes into contact with the uppermost sheet A, the uppermost sheet A is shifted and transferred to near the front edge A1, and the curvature becomes large, and this front edge A
1 faces the inner surface of the notch recess 1d.

Thereafter, when the rear end of the friction surface 1c separates from the surface of the lower sheet A', the uppermost sheet A
The front edge A1 also separates from the surface of the lower sheet A', and from around this time the contact pressure between the friction surface 1c and the uppermost sheet A rapidly decreases, and at the same time, the uppermost sheet A begins to return from its curved state to a straight line. Because of this force, the front end A1 tries to move in the paper feeding direction.

As a result, the front edge A1 of the uppermost sheet A enters into the notch recess 1d from the front end 1d' in the rotational direction of the notch recess 1d as shown in FIG. 4, hits the rear end 1d'' and is caught and engaged. Further movement in the paper feeding direction is prevented.

At this time, due to the rotation of the sorting roller 1, 2
In some cases, more than one sheet A overlaps and is transported, but in this case, as these sheets A are curved, the force exerted on each sheet A to return from the curved state to the straight state increases, and the lower side At a point in time before the front edge A1 of the uppermost sheet A is caught in the rear end 1d'' of the notch recess 1d, the force applied to the lower sheet becomes greater than the frictional force generated between this lower sheet and the uppermost sheet A. , the lower sheet moves away from the top sheet A and returns to the straight state, preventing double feeding.

Then, due to the subsequent rotation of the notch recess 1d, the uppermost sheet A caught on the rear end 1d'' is
The front edge A1 is pulled up in the direction away from the lower sheet A' and eventually returns to the straight state as shown in FIG.
It can be flipped up.

On the other hand, as shown in FIG. 4, the swinging arm 3 temporarily stops swinging when the rear end 1d'' of the notched recess 1d comes closest to the lower seat A', and thereafter moves in the opposite direction. The paper feed rollers 2, 2 come into contact with the free rollers 1f, 1f.

By the subsequent rotation of the sorting roller 1, the cutout recess 1d returns to the initial state where it is farthest from the lower sheet A', and by the time the rotation stops, the paper feed rollers 2, 2 are moved as shown in FIG. The uppermost sheet A turned up on the sorting roller 1 is held between the uppermost sheets A and comes into contact with the free rollers 1f and 1f,
As a result, the rotation of the paper feed rollers 2, 2 is transmitted to the uppermost sheet A, and the uppermost sheet A is fed out in the paper feeding direction.

At this time, in this embodiment, the presser roller 5a rotates only in the paper feeding direction, so the uppermost sheet A is fed straight in the paper feeding direction and is not fed diagonally.

After the feeding rollers 2, 2 finish feeding out the uppermost sheet A, the above-described operation is repeated.

Although the loading table B is tilted in the above-mentioned embodiment, it is not limited to this and may be placed horizontally.Also, the pressing roller 5a is provided as the pressing means 5, but this also applies. The present invention is not limited to this, and other structures may be used as long as they operate in the same way. Furthermore, the swinging arm 3 and the interlocking member 4 are not limited to those described above, and other structures may be used.

[0029]

[Effects of the Invention] Since the present invention has the above structure, it has the following advantages. By intermittently rotating the friction surface of the sorting roller in the opposite direction to the paper feeding direction, the portion of the uppermost sheet up to the position pressed by the pressing means is shifted in the counter-feeding direction and is moved away from the lower sheets. The leading edge of the curved uppermost sheet in the sheet feeding direction engages with the notch recess and is turned over onto the sorting roller, and then the sheet feeding roller pulls the uppermost sheet on the sorting roller. Since the uppermost sheet is fed out in the paper feeding direction by the rotation of the paper feeding roller, it is possible to reliably separate one sheet and then feed the paper, regardless of changes in the paper feeding torque.

Therefore, compared to the conventional method in which lower sheets are moved in the counter-feeding direction and separated one by one due to changes in paper feeding torque, even folded sheets can be fed one by one.
Costs can be reduced because there is no need to use a torque limiter.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional side view of a paper feeding device showing an embodiment of the present invention, showing an initial state.

FIG. 2 is a partially cutaway view taken from the 2nd arrow in FIG. 1;

FIG. 3 is an explanatory diagram illustrating a state in which paper is transferred in a direction opposite to paper feeding by a sorting roller.

FIG. 4 is an explanatory diagram showing the state of engagement with the notch.

FIG. 5 is an explanatory diagram showing when the paper is turned over onto a sorting roller.

FIG. 6 is an explanatory diagram showing the time of paper feeding.

[Explanation of symbols]

A Top sheet
A1 Front edge B Loading platform
1 Judging roller

Claims (1)

[Claims] 1. In a paper feeding device that separates and supplies sheets stacked on a stacking table one by one as a paper feeding roller rotates, the uppermost sheet is brought into contact with the uppermost sheet and the sheet is intermittently fed in a direction opposite to the paper feeding direction. A rotating sorting roller is provided, and the outer circumferential surface of the sorting roller is provided with a friction surface and a notched recess that engages with the front edge in the sheet feeding direction of the uppermost sheet that is transferred and curved as the friction surface rotates. A pressing means for pressing the uppermost sheet toward the stacking table is provided on the side opposite to the paper feeding direction of the sorting roller, and the paper feeding roller, which continuously rotates in the paper feeding direction in conjunction with the intermittent rotation of the sorting roller, is pressed against the outer peripheral surface of the sorting roller. A paper feeding device characterized by sandwiching the topmost sheet and moving it toward and away from the sheet.