JPS638020B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a paper feeding device for a copying machine.

[Prior Art] Some copying machines form a toner image on a photoreceptor on which an optical semiconductor is vapor-deposited, and transfer this to paper fed through a paper conveyance path to copy the image of a document. be.

In such copying machines, the toner image that moves as the photoreceptor rotates is always transferred to a fixed position on the paper moving along the paper transport path, so the timing for feeding the paper is adjusted to match the rotation of the photoreceptor. Regulating is an important issue.

For this reason, some devices are equipped with a registration gate (hereinafter referred to as registration gate) 1 as shown in FIG.

That is, when the copy switch (not shown) is turned on, the paper 2 is transferred to the cassette 3 or the elevator 4.
As the paper feed roll 5 rotates, the paper is sent out one by one onto the paper transport path. As the paper feed roll 6 rotates, the fed paper is conveyed along the first paper guide 8 toward the photoreceptor 9 through a conveyance path. On the other hand, the written image of the original is reconstructed as a toner image on the photoreceptor 9, and moves toward the transfer corotron 10 as the photoreceptor 9 rotates. During this time, the paper 2 comes into contact with the registration gate 1,
Once the progress is stopped and a loop is created, the timing with the photoreceptor 9 is determined. And photoreceptor 9
When the toner image formed on the transfer corotron 10 reaches the transfer corotron 10, the registration gate 9 is released and the transport roll 6
The paper sent to the transfer corotron also reaches the transfer corotron, and the toner image is always transferred to a fixed position on the paper. by the way,
The propulsion force of the paper when the registration gate 1 is released is due to the elasticity of the loop formed by the paper itself when stopped. In order to make the elasticity of this loop more effective, the first paper guide 8 is provided with a paper guide 11 that can be rotated by a certain angle. However, if the loop is too large, as shown in Figure 2, guide 1
The paper 2 protrudes from the gap between the paper guide 1 and the fourth paper guide 12 disposed at the top, causing the paper 2 to become stiff and lose its force in the advancing direction, causing a paper jam.

[Purpose of the invention]

SUMMARY OF THE INVENTION In view of these conventional problems, it is an object of the present invention to provide a paper feeding device for a copying machine that can reliably feed paper to a photoreceptor without the risk of paper jams.

[Summary of the invention]

That is, the present invention achieves the above objectives by providing a movable guide that presses the loop of paper with an appropriate pressure without any gaps, preventing the paper from protruding, and ensuring that a loop with appropriate elasticity is always formed. There is.

〔Example〕

The present invention will be explained below based on the drawings.

In FIG. 3, in addition to the second paper guide 11', a third paper guide 13 is hinged to the portion where the paper loop is formed. The tip of the third paper guide 13 is inserted below the fourth paper guide 12 disposed above, and guides this portion without any gaps.

With this configuration, when the paper sent through the conveyance path comes into contact with the registration gate 1 and forms a loop, the third paper guide 13 expands together with the second paper guide 11' and presses the paper. Gives proper elasticity. However, the third paper guide 13
Even if it expands, the tip of the fourth
It comes into contact with the paper guide 12 of the paper guide 12 and does not create a gap. Therefore, there is no room for the paper 2 to protrude, and jams can be prevented.

In the unlikely event that a jam occurs, if the first paper guide is configured to be rotatable around the lower fulcrum 15, the first paper guide 8, the second paper guide 11', and the third The paper guide 13 can also be opened integrally so that the jammed paper 2 can be easily taken out.

〔Effect of the invention〕

As explained above, the paper feeding device of the copying machine according to the present invention is provided with a movable guide that presses the loop of paper with an appropriate pressure without any gaps.
It prevents the paper from sticking out, always creates a loop with appropriate elasticity, and reliably prevents paper jams.

[Brief explanation of the drawing]

Figure 1 is a system schematic diagram of a conventional paper feeding device.
FIG. 2 is an explanatory diagram of its operation. FIG. 3 is an explanatory diagram of the operation according to the present invention. 1... Registration gate, 2... Paper, 6... Paper feed roll, 8... First paper guide, 9... Drum, 11... Paper guide, 1
1'...Second paper guide, 12...Fourth paper guide, 13...Third paper guide.

Claims (1)

[Claims] 1. In a paper feeding device that temporarily stops the paper to adjust the transfer position of the toner image and forms a paper loop in the paper transport path, the paper transport path is connected to the first paper guide 8 adjacent to each other. Second paper guide 11' and third paper guide 1
3 and a fourth paper guide 12;
The paper guide 13 is the second paper guide 1
1', the second paper guide 11' is rotatably supported by the elasticity of the paper in the direction of expanding the paper transport path when the paper forms a loop, and the second paper guide 11' is supported by the first paper guide 11'. For paper guide 8,
When the paper forms a loop, it is rotatably supported by the elasticity of the paper in the direction of expanding the paper transport path, and the second paper guide 1
1' and the third paper guide 13 rotate in the direction of expanding the paper conveyance path, the third paper guide 13 is engaged with the fourth paper guide 12, and the Second paper guide 11'
and a third paper guide 13 to form a curved paper guide wall between the first paper guide 8 and the fourth paper guide 12.