KR920002742Y1 - Paper guide apparatus for copy machine - Google Patents

Abstract

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Description

Paper transfer guide of copier

1 is a schematic diagram of a copier.

2 is a state of mounting the paper guide of a conventional copier.

3 is a perspective view of the present invention.

4 is a state of mounting the paper guide applied to the present invention.

* Explanation of symbols for main parts of the drawings

26: regulating roller 28: photosensitive drum

31: copy paper 36: paper guide

38 side wall plate 41 spacer

42: shaft 43: leaf spring

44: front frame 45: support rib

46: crevice

The present invention relates to a paper conveying guide of a copier for accurately guiding paper conveyed to the drum surface in a copier using plain paper of an electrophotographic copier.

A commonly used copying apparatus is described below with reference to the electrophotographic copying system system shown in FIG.

The surface of the photoconductor 28 is evenly charged by the corona discharge of the charger 25 and the light source of the partial exposure lamp 22 charged by the rotation of the photosensitive drum 28 It is exposed by light reflected from the original on the platen glass 21.

After this exposure, the axial magnification and the like are processed by the four mirrors 23 and the lens 24, an electro-static latent image such as an image of the original is generated on the photosensitive drum 28. At this time, the generated latent image develops into a visible image while developing with a toner while passing through the developing unit 27, and then the copy paper fed by the feeding roller 20 is transferred to the register roller 26. The visible image on the photosensitive drum 28 is transferred to the copying paper 31 by the action of the transfer machine 32 on the copying paper which is guided to the paper guide 36 through the photosensitive drum 28.

At this time, the copy paper is in close contact with the photosensitive drum 28 by the electrostatic force and the separator 33 serves to separate the close contact with the copy paper. Thereafter, the separated copy paper is conveyed by the conveying belt 30 so as to pass between the heating roller 35 and the pressure roller 34 of the fixing part 40 to the discharge tray 39 axis. When the feed is passed through, the image of the original is settled on the copy surface by heat and pressure, and the desired copy is made. On the other hand, residual toner and a latent image are present on the drum passing through the transfer machine 32, where the toner is removed by a cleaning blade 29, and the latent image is removed from a per-erase lamp array. 37) to be removed.

Conventionally, in such an apparatus, the copy paper 31 is ejected from the cassette, and the copy paper 31 is guided to the paper guide 36 via the paper roller 26 by the rotational force of the paper feed roller 20. It is conveyed to the surface and conveyed to the transfer machine 32 and the separator 33.

However, such a conventional copying apparatus is guided by a paper guide when copying paper is transferred from a register roller, and a device that accurately maintains the gap between the surface of the photosensitive drum and the paper guide when it is transferred to the surface of the photosensitive drum provides a clear image on the surface. Even if it is formed, there is a problem that not only the image is unclear but also that the copy paper jams or twists because the image is not accurately transferred.

The present invention has been made to solve the above problems, and the spacers and plate springs are installed on the paper guide where the copy paper transferred from the paper roller is transferred to the surface of the photosensitive drum through the paper guide, and the surface between the photosensitive drum surface and the paper guide. It is an object of the present invention to increase the transfer efficiency and obtain a high quality image by keeping the gap of the constant at all times, and to prevent the jammed or twisted copy paper.

An embodiment for achieving the above object will be described in detail with reference to the accompanying drawings.

First, the configuration of the present invention will be described with reference to FIGS. 3 and 4, and a paper guide having sidewall plates 38 formed on both sides between the resist roller 26 and the photosensitive drum 28 to which the copy paper 31 is conveyed. (36) forms a paper guide 36 formed on both sides of the side wall plate 38, and the circular spacer 41 is fixed to the central portion of both side wall plates 38 by the shaft 42 and the paper guide 36 The support spring 45 of the front frame 44 supports the leaf spring 43 by coupling the leaf spring 43 to one bottom surface, and the spacer 41 on both sides of the paper guide 36 around the hinge portion 47. Is installed to abut on the surface of the photosensitive drum 28 is formed so that the gap 46 between the paper guide 36 and the photosensitive drum 28 is constant.

Effects of the present invention configured as described above are as follows.

The copy paper 31 is guided to the paper guide 36 via the register roller 26, and is actuated by the transfer machine 32 on the copy paper 31 transported to the surface of the photosensitive drum 28. The visible image of the image is transferred onto the copy paper 31.

The spacer 41 is mounted on both ends of the paper guide 36 by the shaft 42 so that the surface and the gap 46 of the paper guide 36 and the photosensitive drum 28 as described above are always constant. 43, the paper guide 36 installed on the back frame 48 and the front frame 44 is coupled to the support ribs 45 of the front frame 44 so that the leaf spring 43 is supported by the leaf spring 43. The paper guide 36 is always pushed upward with respect to the hinge portion 47 due to the elastic force of the elastic force, so that the spacer 41 coupled to the paper guide 36 comes into contact with the surface of the photosensitive drum 28 so as to always maintain a constant gap 46. The copy paper 31 jams or twists while the copy paper 31 conveyed from the register roller 26 forms a constant gap 26 between the paper guide 36 and the photosensitive drum 28. The transfer efficiency of the thermal copier can be improved and high quality images can be obtained.

According to the present invention as described above by using a spacer and a leaf spring in the paper guide to guide the copy paper transported on the transfer portion of the photosensitive drum surface accurately to maintain a gap between the photosensitive drum and the paper guide to increase the transfer efficiency There is an advantage in that the image quality of the copier can be improved by obtaining a high quality image and preventing the jammed or twisted copy paper.

Claims (1)

In a paper conveying guide for guiding copy paper of a copier to a photosensitive drum, a sheet having sidewall plates 38 formed on both sides between the register roller 26 and the photosensitive drum 28 to which the copy paper 31 is conveyed. The front frame (44) forms a guide (36) and secures a circular spacer (41) to the center of both side wall plates (38) with a shaft (42), and a plate spring (43) is coupled to one side of the paper guide (36). The support ribs 45 support the leaf springs 43 and the spacers 41 on both sides of the paper guide 36 are abutted on the surface of the photosensitive drum 28 so that the paper guide 36 and the photosensitive drum 28 are provided. Paper transfer guide device of the copier, characterized in that the gap 46 is formed to be constant.