JPS6333868Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Field of Application In the present invention, upper and lower paper guide plates are arranged between the paper feed rollers of a pair of registration rollers, and a developing device is provided near the upper and lower paper guide plates. Regarding copying machines.

Configuration of conventional example and its problems In a copying machine, as shown in FIG.
It reaches a pair of registration rollers 5 and 6 via paper guide plates 3 and 4 provided below. At this time, since the registration rollers 5 and 6 are stopped, the paper feed roller 1
The leading edge of the copy paper 2 fed out comes into contact with the registration rollers 5 and 6, the copy paper 2 is deflected upward, and the inclination of the copy paper 2 with respect to the feeding direction is corrected. On the other hand, a toner image 9 is formed by a developing device 8 on the photosensitive drum 7 rotating in the direction of arrow A.
Then, the registration rollers 5 and 6 rotate in synchronization with the movement of the toner image 9 on the photoreceptor drum 7, and the copy paper 2 is sandwiched between the registration rollers 5 and 6 and sent to the photoreceptor drum 7. Upper toner image 9
At the same time, the transfer position 10 is reached, and the toner image 9 is transferred onto the copy paper 2 by the transfer device 10.

However, as copying machines are required to be lighter and more compact, the developing device 8 and the upper and lower paper guide plates 3 and 4 have become closer together, and in order to improve handling and serviceability, the developing device 8 has been made movable. In a copying machine, the length of the upper paper guide plate 3 in the feeding direction is shortened as shown in FIG. I had no choice but to bring it closer.

However, in the case of the structure shown in FIG. 2, the copy paper 2 fed by the paper feed roller 1 may enter the gap between the upper paper guide plate 3 and the developing device 8, causing a paper jam. In addition, in the case of the structure shown in FIG. 3, the distance between the upper paper guide plate 3 and the lower paper guide plate 4 is too short, so that the leading edge of the copy paper 2 is placed between the registration rollers 5 and 6.
When the copy paper 2 comes into contact with the copy paper 2, there is not enough space for the copy paper 2 to bend, which also causes paper jams and the inclination of the copy paper 2 cannot be corrected accurately.

Purpose of the invention The present invention was made to eliminate the above-mentioned drawbacks of the conventional technology, and has a simple configuration that allows copy paper to be smoothly inserted into the registration rollers without causing paper jams, and to feed the copy paper. To provide a copying machine that reliably corrects the inclination in a feeding direction, is small and lightweight, and allows a developing device to be moved in and out.

Structure of the invention In the present invention, one end of an elastic member is attached to one of upper and lower paper guide plates located between a pair of registration rollers and a paper feed roller, and the other end of the elastic member is brought into contact with a developing device. The copy paper is guided by the elastic member and smoothly contacts the registration roller, and since the elastic member is used, the developing device can be moved, and the developing device can be made smaller and lighter. be.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. 11 and 12 are a pair of registration rollers consisting of an upper roller and a lower roller; 13 is an upper paper guide plate;
14 is a lower paper guide plate, 15 is an upper paper guide plate 13
This is an elastic paper guide member (hereinafter referred to as elastic member 15) having one end attached to the elastic member 15. Further, 16 is a developing device disposed above the upper paper guide plate 13, and 17 is a paper feed roller. The other end of the elastic member 15 is attached at a position where it comes into contact with the lower surface of the developing device 16. Further, the developing device 16 is structured so that it can be taken in and out from the front of the copying machine (in the direction from the back to the front of the paper) using a slide device (not shown).

When copying starts, the copy paper 18 is fed to the conveyance path 19 by the paper feed roller 17, and the leading edge of the copy paper 18 is connected to the elastic member 15 and the upper and lower paper guide plates 13, 14.
and reaches the registration rollers 11 and 12.
At this time, since the registration rollers 11 and 12 are stopped, the copy paper 18 is bent in the conveyance path 19,
The leading edge of the copy paper 18 comes into contact with the registration rollers 11 and 12, and its inclination with respect to the feeding direction is corrected. Then, a pair of registration rollers 11 and 12 are rotated by a driving device (not shown) in synchronization with the toner image on the photosensitive drum 7, and the copy paper 18 is sent out.
The toner image reaches the transfer device 10 and is transferred.

According to this embodiment configured as described above, the tip of the elastic member 15 is attached so as to come into contact with the lower surface of the developing device 16, so that the fed copy paper 18 is not bent upward even if it is bent upward. Even if the copy paper 18 is pushed out, the tip of the copy paper 18 is guided by the elastic member 15 and smoothly reaches the registration rollers 11 and 12. In addition, since there is sufficient space in the upper direction for the copying machine 18 to flex,
There is no longer a situation where the deflection of the copy paper 18 is restricted and the inclination of the copy paper 18 cannot be corrected accurately. Further, since the elastic member 15 has elasticity, the tip of the elastic member 15 is in contact with the lower surface of the developing device 16, so that the developing device 16 can be freely taken in and out during service.

In the above embodiment, the elastic member is attached only to the upper paper guide plate 13, but depending on the conveyance path of the copy paper 18 and the position of the developing device 16, an elastic member may be attached to the lower paper guide plate 14 as well. Alternatively, the elastic member may be attached only to the lower paper guide plate.

Further, in the above embodiment, the developing device 16 is configured to be able to move forward of the copying machine (from the back to the front of the paper), but is also configured to be able to move upward (from the bottom to the top of the paper). Needless to say, it may be configured such that the entire transport path including the upper and lower paper guide plates 13 and 14 can be moved.

Effects of the invention As described above, according to the invention, paper jams of copy paper can be prevented by a simple structure in which one end of the elastic member is attached to the paper guide plate and the other end of the elastic member is brought into contact with the developing device. The tilt can be reliably corrected and accurate copies can be obtained. Further, it is possible to obtain a copying machine that is effective in reducing the weight and size of the copying machine, and has excellent handling and serviceability, such as the ability to take in and out the developing device.

[Brief explanation of the drawing]

1, 2, and 3 are sectional views of main parts of a conventional copying machine, and FIG. 4 is a sectional view of main parts showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 11... Upper registration roller, 12... Lower registration roller, 13... Upper paper guide plate, 14... Lower paper guide plate, 15... Elastic member, 16... Developing device, 1
7... Paper feed roller, 18... Copy paper.

Claims (1)

[Claims for Utility Model Registration] (1) A pair of registration rollers, a paper feed roller that feeds copy paper so that the leading edge of the copy paper comes into contact with the pair of registration rollers, and the pair of registration rollers and the paper feed roller. an upper paper guide plate and a lower paper guide plate arranged between the upper paper guide plate and the lower paper guide plate, and a developing device arranged near the upper paper guide plate and the lower paper guide plate, and one end of an elastic member on at least one of the upper paper guide plate and the lower paper guide plate. A copying machine characterized in that the elastic member is attached such that the other end of the elastic member comes into contact with the developing device. (2) The copying machine according to claim 1, wherein the developing device is configured to be movable relative to the upper and lower paper guide plates. (3) The copying machine according to claim 1, wherein the upper and lower paper guide plates are configured to be movable relative to the developing device.