JPH058872A - Sheet material feeding device - Google Patents

Abstract

PURPOSE:To reduce a cost and to reduce the size of a device by eliminating a conveyance roller by performing the role of the conveyance roller by means of a sheet feed roller instead of the conveyance roller, and reducing the number of parts. CONSTITUTION:A separation idler roller 5 is moved in the directions of arrow marks A and B through rotation of a sheet feed shaft 3 and a sheet material loading member 6 is moved in the directions of arrow marks C and D. A sheet feed roller 1 rotatably supported to the sheet feed shaft 3 and normally rotated is brought into contact with and separation from a separation pad 8 and a sheet material 33 loaded on the sheet material loading member 6 and the sheet materials 33 are fed one by one. Conveyance of the sheet material 33 is performed between the sheet feed roller 1 and the conveyance driven roller 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet material feeding apparatus for an image forming apparatus such as a printer, a copying machine or a facsimile machine which separates and feeds sheet materials one by one by friction separation.

[0002]

2. Description of the Related Art A conventional sheet material feeding device will be described below.

FIG. 7, FIG. 8 and FIG. 9 are schematic configuration diagrams of a conventional sheet material feeding device. In FIG. 7, 33 is a sheet material,
Reference numeral 27 is a paper feed roller in which a part of a circle for feeding the sheet material 33 is cut off, and 3 is a paper feed shaft supporting the paper feed roller 27, and a one-rotation clutch (not shown) is incorporated therein. 8
Is a separation pad that is swingably supported in the direction of arrow F inside the main body of the apparatus (not shown).
It is urged to the 7 side. 28 is a separation idler roller that is rotatably supported by the paper feed shaft 3, and is slightly smaller than the radius of the paper feed roller 27, and the cut-out portion of the circle of the paper feed roller 27 is separated by the rotation of the paper feed roller 27. When it moves to the side, it is in contact with the separation pad 8. Reference numeral 6 denotes a sheet material stacking member whose end portion is swingably supported inside the apparatus main body (not shown), and is biased toward the paper feed roller 27 by a spring 7. 29 is an upper guide that guides the conveyance of the sheet material 33, 30 is a lower guide, and 31 and 32 are the image formation at the downstream position in the conveyance direction of the sheet materials 33 that are fed one by one by the paper feed roller 27. It is a carrying roller for carrying to a means (not shown).

Here, the paper feed roller 27 and the sheet material 33,
If the frictional forces between the separation pad 8 and the sheet material 33 and between the sheet materials 33 are Q, R, and S, respectively, the magnitude is Q> R.
> S.

The operation of the sheet material feeding device configured as described above will be described below.

The positional relationship among the paper feed roller 27, the separation pad 8, the separation idler roller 28, and the sheet material 33 is the sheet material 33.
When the paper is not fed and conveyed, the paper feed roller 27 is stopped in a state where the cut out portion of the circle is located at the bottom as shown in FIG. 7, and the separation pad 8 is located on the separation idler roller 28 side. It is biased by a spring 9 and is in pressure contact with. In addition, the separation idler roller 28 is attached from below from the sheet material stacking member 6
Sheet material 33 being lifted by spring 7 via
Both are in pressure contact.

When the paper feeding operation is started, the paper feeding roller 27 first rotates in the direction of arrow G, and the paper feeding roller 27 comes into contact with the sheet material 33. Further, when the paper feed roller 27 rotates, the paper feed roller 27 is moved to the separation pad 8 as shown in FIG.
Is pushed down to feed the sheet material 33 between the paper feed roller 27 and the separation pad 8. At this time, as the sheet material 33, only the uppermost sheet material 33a is fed due to the difference in frictional force between the separation pad 8 and the sheet feeding roller 27.

When the sheet material 33a is fed, the paper feed roller 27 has a built-in one-rotation clutch. Therefore, the sheet material 33a is rotated once to convey the sheet material 33a for a predetermined distance and then stopped, and the state shown in FIG. 9 is obtained. The conveyance distance for one rotation of the paper feed roller 27 is equal to that of the conveyance rollers 31 and 32 and the paper feed roller 27.
It is set longer than the distance from. After the sheet material 33a is conveyed by the sheet feeding roller 27,
It is conveyed by 32 into the image forming means (not shown). At this time, the sheet material 33a is pressed against the separation idler roller 28 by the separation pad 8, but the separation idler roller 2
Since 8 rotates according to the movement of the sheet material 33a, it does not affect the conveyance of the sheet material 33a. After the conveyance of the sheet material 33a is completed, the paper feed roller 27 starts to rotate again, and the paper feed separation is repeated as described above.

[0009]

However, in the above-mentioned conventional configuration, the sheet feeding roller 2 is used to separate the sheet material 33a from the sheet feeding.
Two conveying means, that is, 7 and the conveying rollers 31 and 32, are required, and there are problems that the cost is increased due to the increase in the number of parts and the size of the apparatus is increased.

[0010]

In order to solve the above problems, the present invention solves the above-mentioned problems by rotating means for rotating a feeding roller for feeding a sheet material, and pressing for stacking sheet materials against the feeding roller. A member, a separating member that is pressed against the feeding roller by the pressing member and is fed to the feeding roller to perform friction separation, and a separating member that is provided on the downstream side of the feeding roller in the sheet material feeding direction. After that, the driven roller, which is pressed against the feeding roller and rotates with the rotation of the feeding roller, and the sheet material frictionally separated by the separating member come into contact with the driven roller, and then the pressing member presses the sheet material against the feeding roller. And a release releasing means for releasing the pressing of the sheet material to the feeding roller by the releasing member at substantially the same time that the pressing release means releases the pressing of the sheet material to the feeding roller. With the door.

[0011]

According to the present invention, by the above-mentioned structure, the sheet material can be separated by pressing the sheet material against the roller, and the sheet material can be conveyed by the driven roller pressed against the roller.

[0012]

1, FIG. 2, FIG. 3, and FIG. 4 are schematic structural views of a sheet material feeding device according to an embodiment of the present invention, and FIG. 5 is a schematic view of a sheet material feeding device according to an embodiment of the present invention. 6 is a perspective view of the entire sheet material feeding device according to an embodiment of the present invention. FIG. 6 is a perspective view of the same sheet material feeding device shown in FIG. 7, FIG. 8 and FIG. The same reference numerals are given and the description is omitted.

In FIGS. 1 and 5, reference numeral 1 denotes a paper feed roller which is rotatably supported by a paper feed shaft 3 and feeds a sheet material 33.
Is a cam member supported by the paper feed shaft 3, and is composed of two cam members 2a and 2b. 4 is a regulating member 14a attached inside the apparatus main body (not shown),
14b is an idler roller bracket that can be moved only in the directions of arrows A and B by the cam member 2, and can be moved by the cam member 2.
and b. 5 is idler roller bracket 4
It is a separation idler roller rotatably supported by a pair of separation idler rollers 5a and 5b. 10 is an upper guide for guiding the conveyance of the sheet material 33, and 1
1 is a lower guide, 12 is a conveyance driven roller that is rotatably supported inside the apparatus main body (not shown) and rotates together with the paper feeding roller 1, and 13 is a spring that biases the conveyance driven roller 12 toward the paper feeding roller 1 side. Is.

Here, if the frictional forces between the sheet feed roller 1 and the sheet material 33, the separation pad 8 and the sheet material 33, and the sheet materials 33 are T, R, and S, respectively, the size is T>R>.
It is S.

In FIG. 5, 15a and 15b are feed roller brackets that are rotatably supported by the feed shaft 3 and that support the feed rollers 1a and 1b, 16 and 17 are gears, and 18a,
Reference numeral 18b is a pin provided on the gear 16, and 19a and 19b are holes provided on the paper feed roller brackets 15a and 15b. The holes 19a and 19b are fitted to the pins 18a and 18b to rotate the gear shaft 20. Feed roller 1a,
It is transmitted to 1b. Reference numerals 25a and 25b denote cam members supported by the paper feed shaft 3.

In FIG. 6, reference numerals 21, 22, 23 denote gears,
The rotation of the gear 21 is transmitted to the paper feed shaft 3 and the gear shaft 20, respectively. Reference numeral 24 denotes a one-rotation clutch that is supported by the paper feed shaft 3 and separates and couples transmission of rotation between the gear 23 and the paper feed shaft 3, and the gear 23 and the paper feed shaft 3 are driven by an electric signal from the main body of the apparatus.
The paper feed shaft 3 is coupled so as to rotate by one rotation from the state in which the transmission of rotation between and is separated. 26a, 26b
Is a protrusion that is provided on the sheet material stacking member 6 and that causes the sheet material stacking member 6 to swing in the directions of arrows C and D by the cam members 25a and 25b supported by the sheet feeding shaft 3.

The operation of the sheet material feeding device in one embodiment of the present invention constructed as above will be described below.

First, the positional relationship among the sheet feed roller 1, the separation pad 8, the separation idler roller 5, and the sheet material 33 is as follows.
When the paper feeding and feeding of No. 3 is not performed, as shown in FIG.
The separation idler roller 5 is pushed in the direction of arrow A by the cam member 2 and is in pressure contact with the separation pad 8 which is biased by the spring 9 toward the separation idler roller 5 side. On the other hand, the sheet material stacking member 6 has projections 26a and 26b provided on the sheet material stacking member 6 by the cam members 25a and 25b shown in FIG.
Since the sheet is pressed and moved in the direction of arrow C, the separation idler roller 5 and the sheet material 33 are not in contact with each other. At this time, since the sheet feeding roller 1 is not in contact with the separation pad 8 and the sheet material 33, the sheet material 33 is not fed even if the sheet feeding roller 1 is constantly rotating.

Next, FIG.
When the one-rotation clutch 24 shown in FIG. 6 transmits the rotation between the gear 23 and the paper feed shaft 3, the paper feed shaft 3 rotates, and the rotation of the paper feed shaft 3 causes the cam member 2 and the cam member shown in FIG. 25
a and 25b rotate. As the cam member 2 and the cam members 25a and 25b shown in FIG. 6 rotate, the separation idler roller 5 moves in the direction of arrow B and the sheet material stacking member 6 moves in the direction of arrow D, resulting in the state of FIG. At this time, the paper feed roller 1 is in pressure contact with the separation pad 8 and the sheet material 33.
In this state, the sheet material 33 is fed between the paper feeding roller 1 and the separation pad 8 by the rotation of the paper feeding roller 1, and the sheet material 33 is frictional force between the separation pad 8 and the paper feeding roller 1. Therefore, only the uppermost sheet material 33a is fed.

Further, the sheet feeding shaft 3 is rotated, the separating idler roller 5 is moved in the direction of arrow A and the sheet material stacking member 6 is moved in the direction of arrow C by the cam member 2 and the cam members 25a and 25b shown in FIG. In this state, the rotation of the gear 23 and the feed shaft 3 is interrupted by the one-rotation clutch 24. At this time, contact between the sheet feed roller 1 and the separation pad 8 and between the sheet feed roller 1 and the sheet material 33b stacked on the sheet material stacking member 6 is eliminated, and the sheet material 33b and thereafter are not fed, but the sheet material 33b is not fed. 33a is a paper feed roller 1
It is nipped between the carrier and the driven roller 12, and is conveyed to an image forming unit (not shown). At this time, the sheet material 33a is pressed against the separation idler roller 5 by the separation pad 8, but since the separation idler roller 5 rotates with the movement of the sheet material 33a, it does not affect the conveyance of the sheet material 33a. After the sheet material 33 is conveyed, the paper feed shaft 3 starts to rotate again, and the paper feed separation is repeated as described above.

When the sheet material 33 is used up and the sheet feeding operation is stopped as shown in FIG. 4, the sheet material stacking member 6 is provided with the cam members 25a and 25b as shown in FIGS.
Since the sheet material stacking member 6 and the separation idler roller 5 are not in contact with each other, the sheet material 33 is moved in the direction of arrow C.
Will be easy to replenish.

As described above, according to this embodiment, the paper feed shaft 3
The separation idler roller 5 is moved by the rotation of the separation idler roller 5, and the separation idler roller 5 and the separation pad 8 are brought into contact with each other and separated from each other. The paper feed roller 1 and the separation pad 8 which are constantly rotating by the supported gear shaft 20 come into contact with and separate from each other to feed the sheet material 33 one by one, and at the same time, the paper feed roller 1 and the transport driven follower. The sheet material 33 is conveyed to and from the roller 12. With this configuration, it is possible to perform sheet feeding and conveyance up to the image forming unit only by the sheet feeding roller 1.

[0023]

According to the present invention, the rotating means for rotating the feeding roller for feeding the sheet material, the pressing member for pressing the stacked sheet material against the feeding roller, and the pressing member for pressing the feeding roller against the feeding roller. A separating member that performs friction separation by pressing the fed and fed sheet material against the feeding roller, and a separating member that is provided on the downstream side of the feeding roller in the sheet material feeding direction and is pressed by the feeding roller. A driven roller that rotates with the rotation, and a pressing release means that releases the pressing of the sheet material to the feeding roller by the pressing member after the sheet material frictionally separated by the separating member comes into contact with the driven roller, and a pressing release means. The release of the pressing of the sheet material to the feed roller by means of the separation release means for releasing the pressing of the sheet material to the feed roller by the separating member almost at the same time. By separating the stacked sheet material by pressing the sheet material, the driven material roller pressed by this roller can convey the sheet material, and the sheet material can be separated and conveyed by one roller. Since it is not necessary to separately provide the transport rollers, the number of parts can be reduced, so that the cost can be reduced and the device can be downsized.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a sheet material feeding device according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a sheet material feeding device according to an embodiment of the present invention.

FIG. 3 is a schematic configuration diagram of a sheet material feeding device according to an embodiment of the present invention.

FIG. 4 is a schematic configuration diagram of a sheet material feeding device according to an embodiment of the present invention.

FIG. 5 is an exploded perspective view of essential parts of a sheet material feeding device according to an embodiment of the present invention.

FIG. 6 is a perspective view of the entire sheet material feeding device in one embodiment of the present invention.

FIG. 7 is a schematic configuration diagram of a conventional sheet material feeding device.

FIG. 8 is a schematic configuration diagram of a conventional sheet material feeding device.

FIG. 9 is a schematic configuration diagram of a conventional sheet material feeding device.

[Explanation of symbols]

1 Paper feed roller 1a Paper feed roller 1b Paper feed roller 2 Cam member 2a cam member 2b cam member 3 paper feed axes 4 idler bracket 4a idler roller bracket 4b idler roller bracket 5 Separated idler roller 5a Separate idler roller 5b Separation idler 6 sheet material stacking members 7 spring 8 separation pads 9 springs 10 Upper guide 11 Lower guide 12 Transport driven roller 13 springs 14a regulating member 14b Control member 15a Paper feed roller bracket 15b Paper feed roller bracket 16 gears 17 gears 18a pin 18b pin 19a hole 19b hole 20 gear shaft 21 gears 22 gears 23 gears 24 1-turn clutch 25a cam member 25b cam member 26a protrusion 26b protrusion 27 paper feed roller 28 Separation idler 29 Upper guide 30 Lower guide 31 Conveyor roller 32 transport rollers 33 sheet material 33a sheet material 33b sheet material

Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location H04N 1/00 108 L 4226-5C

Claims (5)

[Claims] 1. A feeding roller for feeding a sheet material, a driving means for rotating the feeding roller, a pressing member capable of pressing the stacked sheet material against the feeding roller, and the pressing member for pressing the sheet material. A separation member that performs friction separation by pressing the sheet material that is pressed by the feeding roller and is rotated by the rotation of the feeding roller, and a sheet material feeding direction of the feeding roller. The driven roller, which is provided on the downstream side and is pressed by the feeding roller to rotate with the rotation of the feeding roller, and the sheet material frictionally separated by the separating member come into contact with the driven roller, and then the pressing member By means of a pressure releasing means for releasing the pressing of the sheet material on the feeding roller by means of the separating member at almost the same time as the pressing release means releases the pressing of the sheet material on the feeding roller. It sheet feeding apparatus according to claim in which a separation canceling means for canceling the pressure to the feed roller over preparative material. 2. The pressing releasing means has a cam, and the pressing of the sheet material to the feeding roller by the pressing member is released by rotating the cam and contacting the pressing member. The sheet material feeding device according to claim 1. 3. The sheet material feeding device according to claim 2, wherein cams of the pressing releasing means are arranged near both sides of the feeding roller. 4. The separation releasing means has a rotatable roller, and the pressing of the sheet material against the feeding roller by the separating member is released by contacting the roller with the separating member. The sheet material feeding device according to claim 1. 5. The sheet material feeding device according to claim 2, wherein the rollers of the separation releasing means are arranged near both sides of the feeding roller.