JP2000118746A - Paper sheet feeding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure the conveyance property and prevent the feed of sheets in an overlapped condition even when a friction coefficient of a feed roller is reduced and a sheet material having a slippery surface is fed. SOLUTION: A pick up roller 1 feeds a sheet material 6 to a feed roller 2 from a loading position, and the feed roller 2 and a separation roller 3 separate the sheet materials 6 one by one for conveyance. Moreover, when the sheet material 6 does not pass between the feed roller 2 and the separation roller 3 and there is a section where it does not pass through, a pressurizing means 9 is controlled by a CPU 8 to bring the pick up roller 1 into pressure- contact with the sheet material 6 so as to assist the conveyance of the sheet material 6 by means of the feed roller 2 and the separation roller 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet feeding apparatus which feeds sheet members one by one from the top.

[0002]

2. Description of the Related Art In a conventional sheet feeding apparatus, a pickup roller feeds sheet members stacked on a sheet member stacking apparatus one by one from the uppermost sheet. No. 1377.

[0003] That is, the conventional paper feeder is configured as shown in FIG. In FIG. 4, reference numeral 1 denotes a pickup roller for feeding a sheet member 6 loaded on a sheet member stacking device 5, reference numeral 2 denotes a feed roller disposed downstream of the pickup roller 1, and reference numeral 3 denotes a contact with the feed roller 2. A separation roller that separates the sheet members 6 fed from the pickup roller 1 into sheets one by one. A sheet member passing between the feed roller 2 and the separation roller 3 is located near the separation roller 3. A sheet detection sensor 7 for detecting the presence of the sheet 6 is provided. Reference numeral 4 denotes a pair of transport rollers disposed further downstream than the feed roller 2 and the separation roller 3. Important performances in such a sheet feeding device are the transportability of the sheet member and a mechanism for preventing double feeding.

[0004] In the paper feeder configured as described above,
When a paper feed command is issued, the pickup roller 1 waiting above the sheet member 6 is lowered by a pressing unit (not shown) to press the uppermost part of the sheet member 6. Thereafter, the sheet member 6 is rotated by rotating the pickup roller 1 in the direction indicated by the arrow R1 in the drawing, so that the sheet member
Are transported while being separated one by one by the feed roller 2 and the separation roller 3, and further transported to the transport roller pair 4 on the downstream side.

Incidentally, the above-described sheet feeding device is configured to retract the pickup roller 1 above the sheet member 6 after feeding the uppermost sheet member 6 in order to prevent double feeding of the sheet member 6. Control means for operating the pressurizing means is provided.

Accordingly, the above-described paper feeder according to the present invention
Even when the next paper feed command is issued, the sheet member 6 is placed between the feed roller 2 and the separation roller 3.
Is held, that is, when the sheet detection sensor 7 emits a paper detection signal, the control means applies a pressure so that the sheet member 6 is not pressed by the pickup roller 1 as in the sequence shown in FIG. Controlling the pressure means.

[0007]

However, in the above-described conventional paper feeding apparatus, when the sheet member 6 exists between the feed roller 2 and the separation roller 3,
Since the pickup roller 1 does not press the sheet member 6, it is effective in preventing double feed, but a special sheet member,
For example, when a sheet member such as a label sheet having a slippery surface is fed, the frictional force between the feed roller 2 and the sheet member 6 is small. was there.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and is intended for use even when the coefficient of friction of the separation / conveyance means is reduced or when a sheet member having a slippery surface is fed. It is an object of the present invention to provide a sheet feeding device which ensures the performance and prevents double feeding.

[0009]

According to a first aspect of the present invention, there is provided a sheet feeding device for feeding a sheet member from a loading position, and a sheet feeding device for feeding a sheet member from a stacking position. A separation / conveyance unit configured to convey the fed sheet members while separating them one by one, and a sheet detection unit configured to detect the sheet members passing through the separation / conveyance unit, wherein the sheet Pressing means for pressing the sheet feeding means against the member; and pressing the sheet feeding means against the sheet member when the sheet member does not pass through the separation / conveying means within a predetermined time or when there is a possibility that the sheet member will not pass. Control means for controlling the pressurizing means so as to cause the pressurizing means.

According to a second aspect of the present invention, the control means controls the sheet feeding means based on a retry signal transmitted when the sheet member does not pass through the sheet detecting means within a predetermined time. The pressurizing means is controlled so as to be pressed again to.

According to a third aspect of the present invention, the control means controls the sheet feeding means when the separation and conveyance means selects conveyance of a sheet member having a smooth surface which is difficult to convey by the sheet selection means. The pressing means is controlled so as to keep the sheet member pressed.

[Operation] Based on the above construction, the paper feeding means feeds the stacked sheet members to the separation / conveyance means, and the separation / conveyance means separates the sheet members one by one. Transport. Further, when the sheet member does not pass through the separation and conveyance unit within a predetermined time, and when there is a possibility that the sheet member does not pass, the control unit controls the pressing unit to press the sheet feeding unit against the sheet member, Assisting the conveyance of the sheet member by the separation / conveyance means.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings.

<First Embodiment> FIG. 1 shows a first embodiment of the present invention.
FIG. 2 is a schematic diagram illustrating a sheet feeding apparatus according to the embodiment, FIG. 2 is a control block diagram of the sheet feeding apparatus according to the first embodiment, and FIG. 3 is a diagram illustrating a sequence of the sheet feeding apparatus according to the first embodiment. In FIGS. 1 and 2, the same or equivalent components as those in FIG. 4 are denoted by the same reference numerals, and redundant description will be omitted.

In FIG. 1, the paper feeder is provided with a pressurizing means 9 for raising and lowering the pickup roller 1 as a paper feed means. The pressurizing unit 9 is controlled to move up and down by a CPU 8 as a control unit. This CPU 8
Is a pressing means 9 based on a retry signal from a sheet detecting sensor 7 as a sheet detecting means for detecting the presence of the sheet member 6 between the feed roller 2 and the separation roller 3 as a separating and conveying means. And the pressurizing means 9 is controlled based on a signal when the conveyance of the special sheet member 6 having a smooth surface is selected by the paper selection switch 11 as the paper selection means.

Next, the operation will be described with reference to FIG.

The sheet member 6 is stacked on the sheet member stacking device 5. When a sheet feed command signal is issued from the start switch 10, the CPU 8 activates the pressurizing means 9 to stand on the sheet member 6. The pick-up roller 1 is moved down to press the uppermost part of the sheet member 6 into pressure. afterwards,
The sheet member 6 is rotated by rotating the pickup roller 1 in the direction of arrow R1 shown in FIG.
Feed roller 2 and separation roller 3 which are fed out of the
Is fed between Then, the CPU 8 controls the sheet member 6.
Is detected based on a signal from the sheet detection sensor 7, the pickup roller 1 is raised.
The CPU 8 controls the feed roller 2 and the separation roller 3 to rotate so as to convey the sheet member 6 while separating the sheet members one by one, and also controls the rotation of the conveying roller pair 4 disposed on the downstream side. Then, the sheet member 6 is conveyed.

At the time of a sheet feeding operation for feeding the sheet member 6,
If the sheet member 6 does not pass between the feed roller 2 and the separation roller 3 within a predetermined time because the feed roller 2 has reached the end of its service life and the friction coefficient has decreased, the sheet detection sensor 7 outputs a no-paper signal (delay signal). And send CPU
8 sends a retry signal. As described above, when the sheet detection sensor 7 issues the paper-out signal, the CPU 8
Transmits a retry signal to control the pressing means 9 so as to press the pickup roller 1 against the sheet member 6 again.

When the sheet member 6 is a special sheet member having a slippery surface, a pressure is applied so as to keep the surface of the sheet member 6 pressed against the pickup roller 1 without releasing the pressure contact of the pickup roller 1 at a predetermined timing. Control means 9. That is, when conveying a sheet member 6 having a smooth surface, the paper selection switch 11 is turned on in advance, and C
The PU 8 controls the pressurizing means 9 to assist the conveyance of the feed roller 2 while keeping the pickup roller 1 in pressure contact even when the sheet member 6 reaches between the feed roller 2 and the separation roller 3. The conveyance of the sheet member 6 existing between the feed roller 2 and the separation roller 3 is assisted by the rotation of the pickup roller 1 in the direction of arrow R1 shown in FIG.

[0020]

As described above, according to the present invention,
When the sheet member does not pass within a predetermined time or when there is a possibility that the sheet member does not pass through the separation and conveyance unit that separates and conveys the sheet member one by one, the control unit controls the pressurizing unit to set the sheet feeding unit to Since the sheet member is brought into pressure contact with the sheet member, it is possible to assist the conveyance of the sheet member by the separation / conveyance means, and it is possible to reliably feed not only a normal sheet member but also a sheet member having a smooth surface. In addition to the above, even when the separation / conveyance unit reaches the end of its life, the conveyance assist of the paper supply unit can avoid the jam of the sheet member and the double feed of the sheet member, and perform the stable paper supply. be able to.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating a sheet feeding device according to a first embodiment of the present invention.

FIG. 2 is a control block diagram of the sheet feeding device according to the first embodiment.

FIG. 3 is a diagram illustrating a sequence of the sheet feeding device according to the first embodiment.

FIG. 4 is a schematic diagram illustrating an example of a conventional sheet feeding device.

FIG. 5 is a diagram illustrating a sequence of a conventional sheet feeding device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Paper feed means (pickup roller) 2 Separation conveyance means (feed roller) 3 Separation conveyance means (separation roller) 6 Sheet member 7 Sheet detection sensor 8 Control means (CPU) 9 Pressure means 11 Paper selection means (paper selection switch)

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) 3F048 AA01 AB01 BA13 BB02 BD05 CB12 CC03 CC11 EA05 3F343 FA02 FB01 FC01 GA01 GB01 GC01 GD01 HA12 HA33 HB04 HD16 JA01 JD03 JD09 JD33 LA04 LA14 LC07 LC19 LD10 MA03 MA14 MA45 MA54 MB03 MC23

Claims (3)

[Claims] A sheet feeding means for feeding a sheet member from a stacking position; and a sheet feeding means for feeding the sheet member from the stacking position.
In a sheet feeding apparatus having a separation / conveying unit that conveys a sheet while separating the sheets, and a sheet detection unit that detects the sheet member passing through the separation / conveying unit, the sheet feeding unit is pressed against the sheet member. A pressurizing unit; controlling the pressurizing unit so that the sheet feeding unit is pressed against the sheet member when the sheet member does not pass through the separation / conveying unit within a predetermined time, or when there is a possibility that the sheet member does not pass through. And a control unit that performs the control. 2. The control means according to claim 1, wherein said sheet feeding means is pressed again to said sheet member based on a retry signal transmitted when said sheet member does not pass through said sheet detecting means within a predetermined time. 2. The sheet feeding device according to claim 1, wherein the pressure unit is controlled. 3. The control means continues to press the sheet feeding means against the sheet member when the sheet selecting means selects conveyance of a sheet member having a smooth surface which is difficult to be conveyed by the separation and conveyance means. 2. The sheet feeding device according to claim 1, wherein the pressurizing means is controlled as described above.