JPH08208062A - Paper feeding device - Google Patents

Abstract

PURPOSE: To make a sheet jam or the like from hardly taking place, even when a document containing a plurality of sheets is used, by providing a hopper with a seat stacking seat made of a low friction material having a smaller friction factor than a friction member in such a state as concealing the member, when the document is used, instead of a single sheet document. CONSTITUTION: A sheet stacking seat 21 having at least a flat and plate type surface and breadth slightly larger than sheet breadth is mounted between the rising walls 9 and 9 of a hopper 1, when a document containing a plurality of sheets is used, instead of a single sheet document. The seat 21 is mounted, so as to conceal cork 2 fitted to the sheet stacking section 10 of the hopper 1. Also, the seat 21 is made of material having a low friction factor than the cork 2 fitted to the hopper 1, for example, a mold and a plastic sheet formed out of polycarbonate, polyacetate, vinyl chloride, ABS or the like, or alternatively cardboard, an iron plate or the like coated with vinyl chloride, ABS or the like.

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 that can be used for both single-cut sheets and book-shaped sheets.

[0002]

2. Description of the Related Art As shown in FIG. 10 (A), a conventional paper feeding device is a paper storage unit (hereinafter referred to as a "hopper", which stores a plurality of sheets of paper (hereinafter referred to as "cut sheet") in a stacked state. -") And a pick roller-3 which is rotatably supported on the housing 6 so as to face the cork 2 attached to the hopper-1 and is laminated on the hopper-1. The hopper-1 is rotated counterclockwise with the hopper-mounting shaft 4 mounted on the housing 6 as a fulcrum so that the pick roller-3 comes into contact with the uppermost sheet (not shown). Is configured.

A printer (not shown) one by one from the uppermost sheet by the pick roller 3 rotating clockwise.
It is sent to the side (direction of arrow A).

When the paper is sent out one by one by the rotation of the pick roller 3, the corners 5 attached to the housing 6 separate the paper one by one. further,
A cork 2 is provided in the hopper-1 in order to prevent the last double feeding in which two sheets are fed out at the same time when the remaining number of sheets becomes low, for example, when the last two sheets are reached.

[0005]

In a conventional sheet feeding device, a plurality of sheets of paper are stacked and bound together along one edge thereof (hereinafter referred to as "booklet paper").
When multiple books are stacked and stored in the hopper-1,
When the pick roller 3 is rotated clockwise as in the case of the single-cut sheet, the topmost sheet of paper is fed one by one to the printer side (direction of arrow A). However, for example, the booklet paper stored at the bottom of the hopper-1 is picked up by a pick roller.
When the sheet is fed by 3, the sheet at the bottom of the book-shaped sheet is in contact with the cork 2 having friction, and thus the sheet at the bottom is less likely to be delivered than the sheet above this sheet.

For this reason, in the case of the book-like paper stored at the bottom of the hopper-1, the delivery by the pick roller-3 is the paper located at the top of this book-like paper (hereinafter referred to as "top-most paper"). Is more likely to be sent out than the paper located at the bottom of this booklet (hereinafter referred to as the “bottom paper”), so the loop formed on the booklet becomes closer to the topmost paper. It is gradually enlarged (see FIG. 10B).

Therefore, there is a problem in that the booklet-shaped paper on which the loop is formed is sent out into the paper feed path, and jams such as paper jam and paper bend occur in the paper feed path.

The present invention has been made in view of the above points, and an object of the present invention is to provide a paper feeding device in which a jam or the like is unlikely to occur even when a book-like paper is used.

[0009]

In order to achieve the above object, the paper feeding apparatus of the present invention supplies a hopper for stacking and accommodating sheets and a part of the cut sheets stacked on the hopper. In a paper feeding device including a pick roller for paper and a friction material provided at a position facing the pick roller, when a book-like paper is used instead of the single-cut paper, the paper is lower than the friction material. It is characterized in that the hopper is provided so as to cover the friction material with a sheet mounting table made of a low friction material having a friction coefficient.

[0010]

In the above construction, when only the last book-like paper stored in the hopper is left, the book-like paper and the friction object (cork) come into contact with each other, so that the friction between the paper and the cork is reduced. , Single cut paper <There is a relation of booklet paper. Therefore, when the booklet is in contact with the cork, the frictional force between the cork and the booklet is larger than that of the single-cut sheet, and the sheet at the bottom of the booklet is , It is more difficult to convey the paper than the paper at the bottom as compared to the paper at the top.

Therefore, when using the book-shaped paper, if the paper-shaped paper is stacked on a paper placing table made of a material having a friction coefficient smaller than that of cork and conveyed by a pick roller, the printer side without jamming. It is sent out (in the direction of arrow A).

[0012]

Embodiments of the present invention will be described below with reference to FIGS. The same components as those of the conventional technique will be described with the same reference numerals.

FIG. 1 shows a sheet feeding device according to the present invention, wherein 1 is a pair of hoppers having a substantially L-shaped cross section and facing each other and attached to a hopper attaching portion 8. The hopper-1 is a sheet. A sheet-like sheet placing section 10 for placing a sheet and this sheet placing section 10
And a rising wall 9 which is formed at a substantially right angle from one end in the longitudinal direction thereof and which guides the sheet. Further, corner claws 5 are located at the lower end corners of the rising wall 9 of these hoppers 1 and are mounted facing each other.

Hopper to which these hoppers-1 are attached
The mounting portion 8 is rotatably mounted counterclockwise about the hopper-mounting shaft 4 mounted on the housing 6 as a fulcrum, and the pick roller 3 is mounted on the housing 6 by a coil-shaped hopper spring 7. It is biased and attached to the side.

A sheet placing section 10 facing the pick roller 3
The corks 2 are attached to each of the sheets in a state of being substantially the same as or slightly protruding from the surface of the sheet stacking portion 10.

When using single-cut sheets, hopper-1
Is rotated counterclockwise against the hopper spring 7 around the hopper shaft 4 as a fulcrum, and the cut sheets are stacked and stored between the rising walls 9 and 9 of the hopper-1. The cut sheets stacked and stored in these hoppers-1 are urged and attached to the pick roller 3 side.

Next, when the pick roller 3 is rotated in the clockwise direction, the cut sheets are separated one by one by the corner claws 5 and 5, and the top sheet stacked on these hoppers-1. The sheets are sequentially conveyed to the printer side (direction of arrow A).

When a sheet-shaped sheet is used instead of the single-cut sheet, as shown in FIG. 1B, the surface between the rising walls 9 of the hopper-1 is at least flat and has a plate shape. Attach the paper tray 21 that is slightly wider than the paper width.
The sheet loading table 21 is the sheet loading unit 10 of the hopper-1.
It is attached so as to cover the cork 2 attached to the. The paper table 21 is made of a material having a coefficient of friction lower than that of the cork 2 attached to the hopper-1 such as polycarbonate.
A mold or plastic sheet made of polyacetate, vinyl chloride, ABS or the like, or a surface of a cardboard or an iron plate coated with vinyl chloride, ABS or the like.

Since the paper loading table 21 has substantially the same size as the paper width, the width between the rising walls 9 of these hoppers-1 can be easily set. Further, since the sheet loading table 21 is only attached by being sandwiched between the rising walls 9, 9 of the hopper-1 and the corner claws 5, 5, the sheet loading table 21 can be easily attached and detached.

A second embodiment of the sheet placing table and the like will be described with reference to FIGS.

Instead of the hopper-1 of the first embodiment, the hopper-25 is attached to the hopper-attaching member 8. The hopper 25 has a substantially L-shaped cross section, and has a substantially flat sheet placing portion 26 on which a sheet-like sheet placing table 31 for placing a book-like sheet, which will be described later, is placed, and this sheet placing portion. A hopper (left) 25a, which is formed from one end in the longitudinal direction of the section 26 at a substantially right angle and is formed with a rising wall 27 for guiding the sheet, and is formed at a substantially right angle from the other end in the longitudinal direction of the sheet stacking section 26. With a rising wall 27 for the paper guide
(Right) 25b. Below the sheet stacking unit 26,
As in the first embodiment, the cork 2 is opposed to the pick roller 3
Are respectively attached. Furthermore, the upper portion of the rising wall 27 has a first engaging recess 27 formed of a groove that opens upward.
A second engaging recess 28, which is a groove formed in the lateral direction and formed at least up to the upper surface of the sheet stacking portion 26, is formed substantially in the middle of the rising wall 27.

Reference numeral 31 denotes a plate-shaped sheet placing table for placing a book-like sheet, and engaging convex portions 32 protruding in a substantially L shape are formed at both ends of an upper portion 31a of the sheet placing table 31, respectively. ing. The respective engaging protrusions 32 of the paper tray 31 are provided with the first engaging recess 27 and the second engaging recess 28 of the hopper 25.
It has a shape to be hooked and engaged with. That is, the groove width B of the first engaging concave portion 27, the groove width G of the second engaging concave portion 28, and the thickness A and the width F of the engaging convex portions 32 of the sheet mounting base portion 31, respectively.
The relation with is B> A and G> F.

When using a single-cut sheet, as shown in FIG. 3A, each of the engaging convex portions 32 of the sheet mounting table 31 is placed in the hopper 25 so that the surface of the cork 2 is exposed. The first engaging recesses 27 are hooked and engaged for use.

Next, when using a book-like paper, as shown in FIG.
As shown in (B), the surface of the cork 2 has the paper loading table 31.
So as to be covered by the engaging convex portion 32 of the sheet mounting table 31.
Are used by hooking them into the second engaging recesses 28 of the hopper 25, respectively.

Therefore, the sheet mounting table 31 is provided with the hopper 25 regardless of whether the cut sheet or the book-like sheet is used.
The sheet mounting table 31 is not lost because it is hooked and engaged with the engaging recesses of the sheet mounting table 31. Further, when the sheet placing table 31 is hooked and engaged with the engaging concave portions of the hopper 25, respectively, the upper end portion 31a or the lower end portion 31 of the sheet placing table 31 is engaged.
Since b is attached so as to project from the upper end portion 25a or the lower end portion 25b of the hopper 25, it is easy to attach and detach the sheet stacking table 31 from the hopper 25.

A third embodiment of the sheet placing portion and the like will be described with reference to FIGS. 4 and 5.

In the modified example of the second embodiment, instead of the engaging grooves 27, 28 provided in the rising wall 27 of the hopper 25, the paper placing portion 36 has a first engaging concave portion 38 having a concave shape or a hole shape. Further, the second engaging recess 39 is provided, and the engaging protrusion 41 that engages with the first engaging recess 38 and the second engaging recess 39 is formed on the back surface of the sheet mounting table 40, respectively.

When using a single-cut sheet, as shown in FIG. 5 (A), each of the engaging convex portions 41 of the sheet mounting table 40 is placed in the hopper 35 so that the surface of the cork 2 is exposed. The first engaging recesses 38 are used by inserting them respectively. Further, when using a sheet of paper, as shown in FIG. 5 (B), each of the engaging convex portions 41 of the sheet placing table 40 is hopper so that the surface of the cork 2 is covered with the sheet placing table 40. It is used by inserting it into the second engaging recess 39 of -35. For this reason, it is possible to prevent the sheet placing table 40 from being lost, as in the second embodiment.
Further, as in the second embodiment, since the end portion of the sheet placing table 40 is attached so as to project from the hopper 35, the sheet placing table 40 can be easily attached and detached.

A fourth embodiment of the sheet placing portion and the like will be described with reference to FIGS. 6 and 7.

Reference numeral 50 denotes a paper loading table, which is rotatably attached to the paper loading portion 52 of the hopper 51. The sheet placing table 50 is plate-shaped, has a size that covers the surface of the cork 2 attached to the sheet placing section 52, and has a generally rectangular recess that opens upward at the upper end of the sheet placing section 52. 53, the shaft support portions 54 are provided at both ends of the upper portion, and the shaft support portion 55 is also formed at the upper end of the sheet stacking table 50. The sheet mounting table 50 is rotatably supported by a shaft 56 on a shaft supporting portion 55 of the sheet mounting table 50 and a shaft supporting portion 54 of the hopper 51.

When using a single-cut sheet, as shown in FIG. 7B, the sheet mounting table 50 is rotated clockwise so that the surface of the cork 2 is exposed. Further, when using the book-shaped paper, as shown in FIG. 7A, the surface of the cork 2 is covered by the paper placing table 50,
The paper table 50 is used by rotating it counterclockwise. Therefore, by simply rotating the paper loading table 50 rotatably attached to the hopper 51, the paper loading table 50 can be easily used for both single-cut sheets and book-like sheets, and the paper loading table 50 can be prevented from being lost. .

A fifth embodiment of the sheet placing member will be described with reference to FIGS. 8 and 9.

The sheet placing table 60 is the sheet placing table 6
The cork 2 is covered by sliding 0 into the hopper 61.

As shown in FIG. 8A, the sheet placing table 60 has a substantially rectangular sheet placing portion 65 and the sheet placing portion 6.
Slide protrusions 66 are formed on the back surface of the upper portion of 5, and deformable engaging protrusions 67 are formed at both ends of the slide protrusions 66, respectively. Further, locking claws 68 are formed on the back surface of the slide protrusions 66, respectively.

A pair of locking claws 6 formed on the hopper 61.
8 and the slide convex portion 66, the paper placing portion 65
As shown in FIG. 8 (B), a substantially rectangular engagement hole 69 and a slide recess 70 are formed in the base. A first engaging recess 71 and a second engaging recess 72 are formed opposite to each other at both ends of the slide recess 70. Further, the cork 2 is attached to the lower portion of the sheet stacking portion 65.

To attach the sheet placing table 60 to the sheet placing section 65, as shown in FIG. 8C, the slide protrusion 66 of the sheet placing section 60 is attached to the slide recess 70 of the sheet placing section 65. The locking claw 68 of the sheet stacking table 60 is the sheet stacking section 6
5 is engaged with the engagement hole 69 and is slidably attached.

When using a single-cut sheet, as shown in FIG. 9A, the engaging projections 67 of the sheet mounting table 60 are respectively arranged on the sheet mounting portion 65 so that the surface of the cork 2 is exposed. The first engaging recess 71 is engaged. Further, when using the book-like paper, as shown in FIG. 9B, the paper placing table 6 is covered so that the surface of the cork 2 is covered by the paper placing table 60.
0 is slid downward to engage the engagement protrusions 67 of the sheet mounting table 60 with the second engagement recesses 72 of the sheet mounting portion 65, respectively. Therefore, by simply sliding the sheet mounting table 60 in the vertical direction, the sheet mounting table 50 can be easily used for both single-cut sheets and book-shaped sheets, and the sheet mounting table 50 can be prevented from being lost.

Next, the operation of the above embodiment will be described.

When the cut sheet is conveyed to the printer side by the pick roller, the cut sheets having the same friction coefficient are stacked on the hopper. Then, the uppermost sheets stacked on the hopper are sequentially conveyed to the printer side. However, when the remaining sheets are low, for example, when the last two sheets are reached, two sheets may be sent out at the same time. Therefore, when the last second sheet is conveyed by the pick roller, The cork is attached to the hopper so that one of the sheets remains in the hopper.

When the book-shaped paper is conveyed to the printer side by the pick roller, there is a relation that the coefficient of friction between the sheets bound to the book-shaped paper is smaller than the coefficient of friction between the book-shaped paper. However, for example, when only the last book-like paper stored in the hopper becomes the contact between the book-like paper and the friction object (cork), the friction between the paper and the cork is a single-cut paper. <There is a relation of booklet paper. For this reason, when the booklet is in contact with the cork, the frictional force between the cork and the booklet becomes large, and the paper at the bottom of the booklet is more than the paper at the bottom. It is more difficult to be transported than the upper sheet. Therefore, the pick roller causes the loop formed on the book-like paper to be gradually expanded as it approaches the uppermost paper, thereby causing a jam.

Therefore, when using the book-shaped paper, when the paper-shaped paper is stacked on the paper placing table made of a material having a friction coefficient smaller than that of the cork and conveyed by the pick roller, the printer side without jamming. It is sent out (in the direction of arrow A).

The present invention has been made in view of the above points, and an object of the present invention is to provide a paper feeding device in which a jam or the like is unlikely to occur even when a book-like paper is used.

[0043]

As described above in detail, when the booklet-shaped paper is used instead of the single-cut sheet, if the booklet-shaped paper is stacked on the paper mounting table made of a material having a friction lower than that of the cork material, the last book-shaped paper is formed. Is also sent to the printer side (direction of arrow A) without causing jam.

[Brief description of drawings]

FIG. 1 is a sheet feeding device according to an embodiment of the present invention,
FIG. 3A is a cross-sectional view showing a sheet feeding device. FIG. 3B is a front view showing a state in which the paper loading table is attached to the hopper.

FIG. 2 is a perspective view of a sheet mounting table and a hopper showing a first embodiment of the same embodiment.

FIG. 3 is a sectional view showing a usage state of a cut sheet and a book-like sheet in the first embodiment, and FIG. FIG. 3B is a cross-sectional view showing a usage state of the book-shaped paper.

FIG. 4 is a perspective view of a sheet mounting table and a hopper showing a second embodiment of the same embodiment.

FIG. 5 is a sectional view showing a usage state of cut sheets and a book-like sheet in the second embodiment, and FIG. FIG. 3B is a cross-sectional view showing a usage state of the book-shaped paper.

FIG. 6 is a perspective view of a paper stacking table and a hopper showing a third embodiment of the same embodiment.

FIG. 7 is a sectional view showing a usage state of cut sheets and a book-like sheet in the third embodiment, and FIG. FIG. 6B is a cross-sectional view showing a usage state of cut sheet.

FIG. 8 is a perspective view of a sheet placing table and a hopper showing a fourth example of the embodiment, and FIG. 8A is a perspective view and a sectional view of the sheet placing table. (B) is a perspective view and a sectional view of a hopper. FIG. 6C is a cross-sectional view showing a state in which the sheet placing table is assembled to the hopper.

FIG. 9 is a sectional view showing a usage state of cut sheets and a book-like sheet in the fourth embodiment, and FIG. FIG. 3B is a cross-sectional view showing a usage state of the book-shaped paper.

FIG. 10 is a cross-sectional view of the sheet feeding device according to the related art. (B) is before being conveyed by a pick roller,
Sectional drawing of the book-shaped paper which shows the back.

[Explanation of symbols]

 2 ... Cork (friction material), 21, 31, 40, 50, 60 ... Paper loading table, 1, 25, 35, 51, 61 ... Hopper.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location G03G 15/00 514

Claims (1)

[Claims] 1. A hopper for stacking and accommodating sheets, a pick roller for feeding the cut sheets stacked in the hopper one by one, and a picker provided at a position facing the pick roller. In a paper feeding device including a friction material, when a book-shaped paper is used instead of the single-cut paper, the friction material is covered by a paper table of a low friction material having a friction coefficient lower than that of the friction material. A paper feeding device characterized by being provided in a hopper.