KR920005080Y1 - Paper supplying apparatus for copying machine - Google Patents

Abstract

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Description

Copier Feeder

1 is a schematic diagram of a copier.

2 is a side use state of the present invention.

3 is a perspective view of the present invention.

4 is an exemplary embodiment of a state of use of the present invention.

* Explanation of symbols for main parts of the drawings

1: guide plate 2: hole

3: Leviathan 4: the chief

5, 5 ': shaft 6: movable rod

7: stopper 9: solenoid

10: spring

The present invention relates to an apparatus for feeding paper accurately fed to the drum surface in an electrophotographic copier using plain paper.

A commonly used copying apparatus will be described with reference to the electrophotographic copying system shown in FIG. 1, and the general copying function will be described. The surface of the photosensitive drum 28 is evenly charged by the corona discharge of the charger 25 and the photosensitive drum is used. The portion charged by the rotation of 28 is exposed by the light reflected from the original on the document table 21 by the light source of the exposure lamp 22.

After this exposure, the magnification and the like are processed by the four mirrors 23 and the lens 24, and an electrostatic latent image such as an image of the original is generated on the photosensitive drum 25, and the generated latent image is then developed by the developer 24. The paper is developed by the toner and becomes visible while passing through the paper. Then, the copy paper fed by the paper feed roller 20 is guided to the paper guide 36 through the register roller 26 and transported to the photosensitive drum 28. The transfer machine 32 acts on the visible image on the photosensitive drum 28 to be transferred onto the copy paper 31.

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, and is transferred between the heating roller 35 and the pressing roller 34 of the fixing part 40 to the discharge tray 39 and radiated by heat and pressure. The image of the original is settled on the sheet of paper to produce the desired copy.

On the other hand, residual toner and a latent image exist on the drum passing through the transfer machine 32, where the toner is removed by the cleaner 29, and the latent image is removed by the latent image removal lamp 37.

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 through the register roller 26 with the rotational force of the paper feed roller 20. It is conveyed to the surface and is transferred to the transfer machine 32 and the separator 33. However, in the conventional copying apparatus, the copy paper from the cassette is fed to the photosensitive drum 28 by the register roller 26 through the guide guide. In this case, the operation of the electronic clutch installed on one side of the register roller 26 is performed. As a result, the register roller 26 is driven to feed the paper, and the paper to be fed is transferred to the paper at a time coinciding with the image formed on the photosensitive drum. However, it was difficult to match the leading edges of the sheet of paper to be fed since it was not provided with a means for controlling the sheet. Therefore, if the timing does not match, there was a problem that paper jams and paper wrinkles occur.

The present invention has been made to solve the above problems, and the purpose of the present invention is to improve the reliability of the machine by accurately matching the leading edge of the paper with the image of the photosensitive drum when feeding the paper from the paper feeder of a small copier. do.

Another object of the present invention is to reduce the manufacturing cost and miniaturization of the device because it is controlled by a simple mechanical device.

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. 2 and 3, and the guide plate 1 through which the paper 11 is conveyed is bent downwardly at a front side to form a guide surface 1a and at the same time the rear side is at the bottom side. The upper surface 1c is bent to form the wall surface 1b, and the upper surface 1c forms a plurality of holes 2 so that the register roller 12 protrudes, and the solenoid 9 is movable on the wall surface 1b. The lever 3 connected to the shaft 5 'is axially axially pinched through the long hole 4 so that the end 3' of the lever 3 protrudes from the upper surface of the guide plate 1. In the figure, reference numeral 7 denotes a stop wave for preventing the forwarding of the movable rod 6, and 10 denotes a spring.

Referring to the accompanying drawings, the effects of the present invention configured as described above will be described with reference to the accompanying drawings, the paper 31 is transferred to the register roller 20 along the transfer path in the copy paper 11 is made of a single power source. At this time, when the paper positioned at the top of the paper feed cassette is fed by the driving of the paper feed roller 20, the paper is guided along the guide surface 1a from the front of the guide plate 1 and transported by the register roller 12 so that the tip is guide plate ( It is caught by the end 3 'of the lever 3 provided on the side wall 1b of 1). At this time, both sides of the leading end of the sheet touch the two lever ends 3 'and remain in parallel. Thereafter, the electrostatic latent image of the photosensitive drum 28 is developed and rotated in the developing unit 27, and the solenoid 9 is driven at the moment when the moving part is moved to the transfer unit, and the movable rod 6 is pulled. The lever 3 engulfed in 5 'is moved from the position of the solid line in FIG. 4 to the position of the dotted line as the axis 5' moves. That is, since the end 3 'of the lever is located below the upper surface 1c of the guide plate 1, the paper 11 can be transported.

In this state, the paper 11 is transported along the conveyance path, and after the transfer operation, the paper 11 is moved by the conveying unit 30 to pass through the fixing unit 40. At this point, the means of the paper passes through the fixing unit 40. At the solenoid 9 the drive power is cut off.

In the above state, the paper guide lever 3 is positioned in the initial vertical state by the restoring force of the spring 10 on which the movable rod bar is provided on the other side. At this time, the stopper 7 causes the movable rod 6 to stop at the first position.

Therefore, the next sheet to be copied can be inserted and in a waiting state, and the copy operation is performed by repeating the above operation.

According to the present invention as described above, by installing the paper guide lever operated by the solenoid to accurately feed the copy paper transported on the transfer portion of the photosensitive drum surface, it is possible to transfer a structurally simple device, and to reduce the cost of the machine as well as transfer It is to improve the reliability of the copier by increasing the efficiency, making high quality Mars and preventing the jammed or twisted copy paper.

Claims (1)

In an office automation device that transfers and prints a paper such as a copying machine or a laser printer, a pair of levers 3 are installed on the side wall 1b of the guide plate 1 for guiding the incoming paper, but the solenoid 9 It is axially supported by the movable rod 6 operated by the shaft 5 'and the long hole 4 formed in the middle portion by the pin 5 on the side wall 1b, positioned by the movable rod 6, and drawn therein. Paper feeder of the copier characterized in that to be able to align the leading end of the paper (11).