JPH058891A - Sheet feeding device - Google Patents

Abstract

PURPOSE:To reduce production of a friction load between a planetary roller and a sheet during conveyance of a sheet by means of a conveyance roller by stopping rotation of the planetary roller. CONSTITUTION:The periphery of a solar shaft 19 is supported by a rocking arm 23 so that a planetary roller 20 effects planetary movement, and a solar shaft 19 and a planetary roller 20 are rotated through a drive gear 16, a solar gear 17, and a planetary gear 18 through rotation by a driven source. During conveyance of sheets, the planetary roller 20 feeds a sheet 22 nipped between the planetary roller and a conveyance table 21 as the sheet is brought into pressure contact therebetween. In rotation of the planetary gear 18, since a load is exerted by a pseudo load member 26, when the drive gear 16 is rotated in a reverse direction to a direction during conveyance of the sheets, the planetary roller 20 is separated away from the sheet 22 and lifted upward, and a friction load is not produced between the sheet 22 and the planetary roller 20.

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, for example, a sheet feeding device for a copier or a printer.

[0002]

2. Description of the Related Art Generally, a paper feed roller that feeds out one sheet at a time does not transfer a frictional force to the next sheet at the time of feeding out one sheet (continuous rotation causes the sheet to be delivered without break). Means as shown in (a) to (c) are adopted. That is, FIG. 3A shows a means for stopping the rotation of the paper feed roller 1. After the rotation is stopped, the paper in the middle of being sent out is pinched on the lower side. And, the drawing of this is the view of the transport roller shown in FIG. This transport roller 2
Pulls out the paper 3 against the frictional force between the paper feed roller 1 and the paper 3. At this time, in order to reduce the frictional load as much as possible, if the one-way clutch 5 is interposed between the paper feed roller 1 and the shaft 4 supporting the same to pull the paper, the one-way clutch 5 and the shaft 4 are separated. By rotating between them, the frictional force between the paper feed roller 1 and the paper 3 is reduced. However, even though it is reduced, there is a problem that a considerable friction load still remains and the inertial load of the paper feed roller 1 is newly added.

Further, (b) is a view showing a means using the half roller 6, and in comparison with (a), since the paper can be sent out only by the length of the half circumference, the conveying roller 2 is half The placement of the transport roller 2 is restricted, for example, because it is necessary to bring it close to the split roller 6. Further, (c) is a view showing a means for moving the paper feed roller 1 up and down, (a)
Compared with, the shaft for driving the paper feed roller 1 needs to be moved up and down, which is a complicated mechanism.

[0004]

However, in the above-described conventional paper feeding device, even if the one-way clutch 5 is used for the paper feeding roller 1, the reduction of the frictional load with the paper 3 is insufficient. Therefore, there is a problem that the use of the one-way clutch 5 causes a cost. In addition, half roller 6
When the vertical movement mechanism of the paper feed roller 1 is used, the frictional load when the paper is pulled by the conveyance roller 2 is almost eliminated, but there is a problem that the arrangement of the conveyance rollers is limited and the mechanism is complicated.

Furthermore, conventional sun rollers, planetary rollers,
As a sheet feeding device using a mechanism with a swing arm, there is one described in Japanese Patent Laid-Open No. 2-295837, which conveys a sheet by rotational drive of a planetary roller and rotates the swing arm even when the rotation is stopped. Due to the movement, the force for pressing the paper is released to some extent. However, also in this case, there is a problem that the pressing force on the sheet remains due to the own weight of the planetary roller and the swing arm, which causes a frictional load.

Therefore, the present invention provides a sheet feeding device capable of reducing the frictional load generated between the planetary roller and the sheet when the sheet is conveyed by the conveying roller by stopping the rotation of the planetary roller. The purpose is to

[0007]

In order to achieve the above, a sheet feeding device according to the present invention has a first rotating body and a second rotating body in which a supporting member allows a planet to rotate around the first rotating body. And a rotation transmitting member provided between the first rotating body and the second rotating body, or rotation is transmitted by contact between the first rotating body and the second rotating body. The rotation transmitting means is used to rotate the first rotating body to rotate the second rotating body.
In the paper feeding device configured to transfer the rotation to the second rotating body and simultaneously feed the paper between the second rotating body and the third rotating body or the fixing member, A pseudo load unit that applies a rotational load and a reverse rotation drive unit that rotates the first rotating body in a direction opposite to the direction in which the sheet is conveyed are provided.
It is characterized in that the rotating body of is separated from the paper.

[0008]

Therefore, according to the present invention, the pseudo load means applies a rotational load to the second rotating body to make it difficult to rotate.
When the first rotating body is rotated in the sheet conveying direction, the rotation is transmitted from the first rotating body to the second rotating body, and the sheet is normally sent out. Next, after the conveyance of the sheet is completed, the reverse rotation drive means is used to rotate the first rotating body in the opposite direction, so that the pseudo load causes the second rotating body to swing up and lift up above the sheet. Converted into force, second
The rotating body of can be separated from the paper. For this reason, the second rotating body is separated from the sheet, and thus the sheet can be conveyed without causing a frictional load between the sheet and the second rotating body.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram for explaining an embodiment of a sheet feeding device according to the present invention. In FIG. 1, 11 is a first roller, which is a sun roller, 12 is a second roller, which is a planet roller around which a planet is around, 13 is a third roller, which is a driven roller, and 14 are 11 and 12 A rocking arm, which is a supporting member of the paper, and a paper sheet 15. In addition, each arrow A, B, C shows a rotation advancing direction. A sun roller 11 rotatably supported by a swing arm 14
And the planet roller 12 contact each other and transmit the rotation. The sun roller 11 is fixed to a frame (not shown), and the planet roller 12 is rotatable around the sun roller 11 by a swing arm 14. The driven roller 13 is arranged at a position in contact with the planetary roller 12, and is rotatably supported by the frame.

When the sun roller 11 is rotated in the arrow A direction by a drive source (not shown), the planet roller 12 rotates in the arrow B direction. At this time, the swing arm 14 obtains a rotational force in the direction of arrow A around the sun roller 11, and the driven roller 13
The planetary roller 12 is brought into pressure contact with and the rotation is transmitted. The sheet sandwiched between the planet roller 12 and the driven roller 13 moves in the direction of arrow C.

The positional relationship among the rollers 11, 12 and 13 is preferably such that when the sun roller 11 rotates, the planetary roller 12 becomes a bite bite and the pressing force with the driven roller 13 increases. Next, FIGS. 2 and 3 show another embodiment of the present invention. In the drawings, reference numeral 16 denotes a drive gear, which is connected to a rotation drive source (not shown) capable of normal and reverse rotation.
The sun gear 17 and the planet gear 18 are rotation transmission members provided between the sun shaft 19 which is the first rotating body and the planet roller 20, and the paper is provided between the planet roller 20 and the carrier 21.
Carry it across 22. Reference numeral 23 is a swing arm that is a support member, 24 is a bearing, and 25 is a frame. Further, 26 is a pseudo load member that applies a load to the rotation of the planet gears 18.

The sun shaft 19 is rotatably supported by a bearing 24 fixed to a frame 25. Sun shaft 19
The sun gear 17 is fixed to one side of the
More transmitted. Swing arms on both sides of the sun shaft 19
23 is rotatably fitted and has a planetary roller at one end.
The shaft of 20 is rotatably fitted, and the planetary gear 18 and the sun gear 17 mesh with each other to rotate the planetary roller 20.
The planetary roller 20 can be rotated around the sun shaft 19 by a swing arm 23, and a pseudo load member 26 is attached to the planetary roller 20. Therefore, a constant pressure is applied to the carrier table 21 as shown in FIG. Contact with. When the paper 22 is sent to the planetary rollers 20, the paper 22 is sent by the planetary rollers 20 in the direction of arrow D in FIG.

FIG. 4 schematically shows an example in which the paper feeding device of the present invention is applied to a paper feeding mechanism of a copying machine. In the figure, 27 is an OPC drum having a photoreceptor coated on its surface, 28 is a charger, 29 is a sun roller, 30 is a planet roller, 31 is a driven roller, 32 is a swing arm, 33 is paper, and 34 is paper feed. Roller (Operation is the same as planetary roller.) 35 is stacked paper, 36
Is a sun roller and 37 is a swing arm.

Then, the paper 33 delivered by the paper supply roller 34 strikes the planetary roller 30 and the driven roller 31 which also serve as registration rollers. When the sun roller 29 is driven at the timing, the paper 33 is sent out by the planetary roller 30 and the driven roller 31. After the start of transportation by resist,
If the sun roller 36 is rotated counterclockwise,
The paper feed roller 34 is lifted and separated from the paper 35 by the function of the pseudo load member 26 (not shown) provided on the paper 34. In this way, the paper feed roller 34 after the paper feed is completed is lifted upward and does not apply a load to the paper.
It is possible to prevent a frictional load from being generated when the paper 33 is fed by 30.

FIG. 5, FIG. 6 and FIG. 7 are views showing a configuration example of the pseudo load member in this embodiment. When a pseudo load is applied by a frictional force, as shown in FIG. 5, the planetary gear 18 is urged by a spring 26c via a holding plate 26b against a friction member 26a such as cork or felt, so that the planetary gear 18 is pressed. A frictional force is generated on the side surfaces of 18 and becomes a load.

When a dummy load is produced by using a damper, as shown in FIG. 6, a damper 26d is fixed to the swing arm 23 by a fixing screw 26e on the rotating shaft portion of the planetary gear 18. For the damper 26d, for example, a hydraulic damper or a powder torque limiter can be preferably used. FIG. 7 is a cross-sectional view showing one structural example of the hydraulic damper. In the figure, 38 is a rotary shaft that is directly connected to the planetary roller, and an impeller is formed at its end. 39 is a seal member for preventing leakage of liquid, 40 is a cover, and the inside thereof is filled with viscous oil 41.

In the damper 26d having such a structure, when the planetary roller 20 of FIG. 6 rotates, the rotary shaft 38 of FIG. 7 also starts to rotate, but the oil 41 adds resistance to the impeller of the rotary shaft 38 to generate a load. To do. FIG. 8 shows a paper feed roller in this embodiment.
FIG. 34 is a diagram showing an operation mode of 34. As described above, in this embodiment, since the pseudo load member 26 is arranged on the paper feed roller 34, when the paper 35 is fed out, the sun roller 36 moves in the direction of arrow E.
The paper is fed while the paper feed roller 34 is pressed against the paper 35 by rotating the.
Is rotated in the opposite arrow F direction, the paper feed roller 34 can be lifted in the arrow G direction and held at the broken line position.

FIG. 9 is an explanatory view of the operating principle when the sun roller 36 is rotated in the reverse direction to lift the paper feed roller 34. That is, the torque T generated by the pseudo load member (not shown) provided on the paper feed roller 34 is a moment when the weight of the paper feed roller 34 and the swing arm 37 is F and the length of the swing arm 37 is 1. The paper feed roller 34 can be lifted only by adjusting the pseudo load so that Fl <T.

[0019]

According to the present invention, the pseudo load means applies a rotational load to the second rotary body, and the reverse rotation drive means causes the first rotary body to rotate in the reverse direction after the sheet conveyance is completed. The second rotating body can be separated from the upper surface of the sheet, and the frictional load between the sheet and the second rotating body can be reduced.

[Brief description of drawings]

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

FIG. 2 is a side configuration diagram showing another embodiment of the paper feeding device according to the present invention.

FIG. 3 is a front view of FIG.

FIG. 4 is a front view showing a configuration example in which the present invention is applied to a copying machine.

FIG. 5 is a side view showing a configuration example of a pseudo load member according to the present invention.

FIG. 6 is a side view showing a configuration example of another pseudo load member according to the present invention.

7 is a cross-sectional view of the structure of the pseudo load member of FIG.

FIG. 8 is an operation explanatory view of the second rotating body according to the present invention.

9 is an explanatory diagram of the operation principle of FIG.

[Fig. 10] Fig. 10 is a configuration diagram of a conventional sheet feeding device, (a) is a diagram using a sheet feeding roller, (b) is a diagram using a half roller,
(C) is a diagram using a vertically movable sheet feeding roller.

FIG. 11 is an explanatory diagram of a sheet conveying operation in a conventional sheet feeding device.

[Explanation of symbols]

 11 sun roller (first rotating body) 12 planetary roller (second rotating body) 13 driven roller (third rotating body) 14 swing arm (supporting member) 15 paper 17 sun gear (rotation transmitting member) 18 planet Gear (rotation transmitting member) 19 Sun shaft (first rotating body) 20 Planetary roller (second rotating body) 21 Transport table (fixing member) 23 Swing arm (supporting member) 26 Pseudo load member (pseudo load means) 26a Friction member 26b Holding plate 26c Spring 26d Damper 26e Fixing screw 34 Paper feed roller (first rotating body) 36 Sun roller (second rotating body)

Claims (1)

Claim: What is claimed is: 1. A first rotating body and a support member for the first rotating body.
A second rotating body capable of planetary rotation around the rotating body, and a rotation transmitting member provided between the first rotating body and the second rotating body, or the first rotating body. And the rotation transmitting means adapted to transmit the rotation by contact with the second rotating body, the rotation is transmitted to the second rotating body by the rotation of the first rotating body, and at the same time, the second rotating body is transmitted. A sheet feeding device configured to feed a sheet between a rotating body and a third rotating body or a fixed member, wherein a pseudo load unit that applies a rotational load to the second rotating body, and the first rotating body. Reverse rotation driving means for rotating the body in a direction opposite to the direction when the sheet is conveyed, and after the sheet has been conveyed, the first rotating body is reversely rotated to separate the second rotating body from the sheet. Paper feeding device.