JPS5812174Y2 - copying device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a copying apparatus using an electrophotographic process, and more particularly to a copying apparatus capable of overwriting and partial erasing.

Conventionally, when it was desired to copy portions of two originals onto the same copy paper, the originals were folded or cut and pasted.

Furthermore, if there is a part of information that one does not want to copy, that part is masked.

However, in such cases, the original may be damaged by cutting or folding, and black lines may appear in the folds or overlapping areas, making the copy difficult to read.

SUMMARY OF THE INVENTION An object of the present invention is to provide a copying apparatus which eliminates the drawbacks of the conventional apparatus and can easily perform duplicate copying or partial deletion copying.

The present invention will be explained below with reference to embodiments shown in the drawings.

FIG. 1 shows a first embodiment of the present invention, in which a document table 1 has a first document placement section 1A and a second document placement section 1B arranged in series in the scanning direction.

The document on the document table 1 is scanned by light from a movable light source 2.

In other words, after the light from light source 2 is reflected by the document, the light from light source 2
The first mirror 3 that moves together with the first mirror 3
It is reflected by the second mirror 4, which moves in the same direction as the first mirror 3 at a slower speed.

The reflected light from the second lens 4 is branched into two directions, which pass through lenses 5A and 5B, respectively.

The photosensitive drum 8 is exposed at different positions via the third mirrors 6A, 6B and the fourth mirrors 7A, 7B.

The first mirror 3, second mirror 4, lens 5A, third mirror 6A and fourth mirror 7A form a first optical system,
Further, the first mirror 3, the second mirror 4, the lens 5B,
The third mirror 6B and the fourth mirror 7B form a second optical system.

A shutter 9 faces each of the optical systems, and this shutter 9 blocks one of the optical paths 10A and 10B of the first optical system and the second optical system.

The optical path 10A is blocked by this shutter 9,
10B is the one that has not been scanned.

The photoreceptor drum 8 is rotated in the direction of the arrow around a central axis 11, and around the photoreceptor tram 8 there is a charger 12 that charges the photoreceptor drum 8, and a charger 12 that charges the photoreceptor drum 8 and transfers toner to the photoreceptor. A developing roller 13 that causes the toner to adhere to the photosensitive drum 8, a transfer charger 14 that transfers the toner adhering to the photosensitive drum 8 onto copy paper, and a cleaning roller 1 that sequentially removes the residual toner on the photosensitive drum 8.
5 and the like are arranged in this order with respect to the rotational direction of the photoreceptor drum 8.

and an optical path 10A of the first optical system and the second optical system.
, 10B are the charging charger 12 and the developing roller 1.
The photoreceptor drum 8 between 3 and 3 is exposed to light.

Note that the scanning speed of the original by the light source 2 and the rotation speed of the photoreceptor drum 8 mean that the same portion of the photoreceptor drum 8 is It is adjusted so that it is exposed twice.

Next, the operation of the above-described embodiment will be explained.

When duplicating information on two originals, originals (not shown) are placed on the first and second original placing sections 1A and IB of the original table 1, and the apparatus is activated.

Then, first the light source 2 and the first . The second mirror 3.degree.4 moves to scan the surface of the document on the first document placement section 1A.

The scanned optical paths 10A and 10B try to expose the photoreceptor drum 8, but the optical path 10B is connected to the shutter 9.
Since the optical path 10A is blocked by the photoreceptor drum 8, only the optical path 10A exposes the photoreceptor drum 8.

Then, when the document surface on the second document tray 1B is scanned, the shank 9 is automatically switched and the optical path 10 is
Since the optical path A is blocked, only the optical path 10B exposes the photosensitive drum 8.

At this time, since the photosensitive drum 8 is rotated by a predetermined angle, the portion where the electrostatic latent image is formed by the optical path 10A is exposed again by the optical path 10B.

Therefore, it is possible to make copies of two originals stacked one on top of the other.

A specific example of such superimposed copying is shown in FIG. 2, in which the unnecessary information portion of the original A is covered with black paper 16 and placed on the first original placing section 1A of the original table 1, and the other If the unnecessary information portion of original B is also covered with black paper 1γ and placed on the second original placing portion 1B and the apparatus is driven, both originals A and B are covered with black paper 16, 1.
The portion not covered by 7 is copied onto one sheet of copy paper P.

Note that if one of the two originals A and B is printed with halftone dots, it becomes possible to separate the halftone dots, and if you do as shown in Figure 2, only one part of the original has halftone dots. be able to.

Using a similar idea, you can also erase part of the information in the manuscript.

FIG. 3 shows a second embodiment of the present invention, in which only one optical system is used, and the same portion of the photosensitive drum 8 is exposed twice by rotating the photosensitive drum 8 twice. It is something.

Therefore, the charging charge 12, the phenomenon roller 13, the transfer charge 14, and the cleaning member 15 operate once every two rotations.

As described above, the copying apparatus according to the present invention includes a document table on which two originals can be placed, two optical systems that scan the two originals and expose a photoreceptor, and one optical system. Since it has a switchable shutter for selectively blocking the optical path of the image forming apparatus, it has an excellent effect of being able to easily perform overlapping copying and partial removal copying.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a first embodiment of a copying apparatus according to the present invention, FIG. 2 is an explanatory diagram showing a specific example of duplicate copying, and FIG. 3 is an explanatory diagram showing a second embodiment of a copying apparatus according to the present invention. FIG. 1...Original table 1.2...Light source, 3,4
, 6, 7... mirror, 8... photoreceptor,
9...Shutter, 12...Charger, 13...Developing roller, 14...
Transfer charger, 15...Cleaning member.

Claims (1)

[Scope of utility model registration request] A document table that can hold two originals, two optical systems that scan these two originals and expose the photoreceptor, and a switchable switch that can selectively close the optical path of one of the optical systems late. A copying apparatus having a shutter.