JPS6275672A - Copying device - Google Patents

Abstract

PURPOSE:To perform side erasing and destaticization of a photosensitive body with one lamp to simplify the constitution of a copying device by dividing a reflecting plate facing the exposure lamp by transfer paper sizes and providing divided plates freely movably independently of one another and displacing them with a reflecting plate driving device. CONSTITUTION:An exposure lamp 2 is provided under an original surface 1 on a copying device, and a reflecting plate 3 is arranged to face the lamp 2. This reflecting plate 3 is freely turned and displaced around a fulcrum 4 in the lower end side, and this reflecting plate 3 is divided into reflecting plates 3a-3d by transfer paper sizes. This reflecting plate 3 is displaced between stoppers 5a and 5b by the reflecting plate driving device consisting or a CPU 8 and solenoids 7a-7d. Individual reflecting plates 3a-3d divided by transfer paper sizes are displaced by the reflecting plate driving device, and one lamp 2 is used to perform erasing of front and rear ends and sides of an image and exposure of the photosensitive body, thus simplifying the constitution of the copying machine.

Description

[Detailed description of the invention] Technical field The present invention relates to a copying apparatus.

BACKGROUND ART In general, in a copying machine, a photoreceptor is uniformly charged by a charger, an original is exposed to light using an exposure lamp, and the light reflected from the original is imaged on the photoreceptor. The unnecessary charges are removed and erased using an eraser. After the image is transferred to the transfer paper, the charge on the photoreceptor is removed by a charge removal lamp. That is, the exposure, erasing, and erasing steps are each performed by members independently provided for exclusive use. As a result, the number of parts increases, and reliability tends to decrease accordingly.

Purpose The present invention has been made in view of the above points, and an object of the present invention is to provide a copying apparatus that can perform erasing and neutralization according to the size of transfer paper on a photoreceptor using an exposure lamp for illuminating a document. do.

Structure In order to achieve the above object, the present invention provides a copying apparatus that is provided with an exposure lamp that exposes the surface of a document and a reflector that faces the exposure lamp and exposes the surface of the document with reflected light. They are divided according to the size of the transfer paper and are movable independently, and when erasing on the photoconductor, these reflective plates are set individually according to the size of the transfer paper, and when the photoconductor is neutralized, the total reflection plate is attached to the exposure lamp. The present invention is characterized by the provision of a reflector drive device that moves the light from the photoreceptor to a position where it directly reflects the light toward the photoreceptor.

Hereinafter, one embodiment of the present invention will be described based on the drawings. First, the basic configuration will be explained with reference to FIGS. 2 and 3. Exposure lamp 2 using an aperture type fluorescent lamp that exposes the document surface 1
is provided. A reflecting plate 3 is provided below the original image 1 and facing the exposure lamp 2. Here, this reflecting plate 3 is not fixed in position, but is rotatable about a fulcrum 4 on the lower side. More specifically, as shown in FIG.
It can take two positions regulated by the collars 5a and 5b, and is normally biased by a torsion spring 6 to take the position shown by the dashed line on the stopper 5a side, and the reflector plate connected to the back side of the reflector plate 3. Solenoid 7 as a drive device is O
It is set so that when it is N, it is sucked and takes the position shown by the solid line on the S1-Blank 51) side. The ON/OFF state of the solenoid 7 is controlled by a control signal from the CPU 8.

As a result, when the reflector 3 is in the state shown by the solid line,
The light from the n-light lamp 2 follows the optical path a and directly exposes the document surface 1, and the reflected light from the document surface 1 is transmitted to a photoreceptor (not shown).
At the same time, the light from the exposure lamp 2 is also irradiated onto the reflecting plate 3, exposing the original image 1 along the optical path, and as in the case of optical path a, the light reflected from above the original surface is directed onto the photoreceptor. irradiated. In other words, the document surface 1 can be efficiently exposed with one exposure lamp 2.

When the reflecting plate 3 is moved to the state shown by the dashed line, the direct light from the exposure lamp 2 is reflected by the reflecting plate 3 along the optical path C and is irradiated onto the photoreceptor. At the same time, the light following the optical path a from the exposure lamp 2 is reflected by this reflection plate 3.
The light is blocked and the photoconductor side is not irradiated. From this, it is understood that regardless of the presence or absence of a document, the potential on the photoreceptor can be erased by placing the first reflecting plate 3 in the state shown by the one-dot chain line. Therefore, it can be understood that the exposure lamp 2 can be used to eliminate the potential on the photoreceptor and to erase outside the area of the transfer paper.

This point will be explained with reference to the timing chart of FIG. In this timing chart, the main motor after the print key is inserted, 4;
This shows the timing of a normal copying process using an exposure lamp 2, an optical scanner, etc. In such a process, erasing, etc. can be performed by appropriately controlling ON/OFF of the solenoid 7. That is, by turning off the solenoid 7 at the start and end of scanning by the optical system scanner to bring the reflection plate 3 into the state shown by the dashed line, the front end and rear end of the image can be erased. If the copying machine has a method for specifying the erase area (for example, S! of the erase area, type input), you can turn off the solenoid 7t at the part you want to erase even in the middle of the original image. The white areas of the image are erased as images by the total reflection light from the reflecting plate 3, and after all, the rung 11 can be erased at the portion shown by the broken line in this timing chart. Then, by rotating the photoreceptor once with the solenoid 7 turned off, the charge remaining on the photoreceptor can be removed. In this way, a static elimination lamp and an eraser can be omitted.

Therefore, copying machines generally use transfer paper of multiple sizes, and the size of the transfer paper is detected by a sensor or designated by an input means.

Charges on the photoreceptor outside the size of the transfer paper are erased (site erase). In order to perform such site erasing, in this embodiment (here, it is assumed that four types of transfer paper 98 to 9d, A3, B4, A4, and B5 are used in the one-sided reference method), the above-mentioned reflection vi3 is used. 1st
As shown in the figure, depending on the size of the transfer paper 9, a reflective plate 3a,
3b, 3c.

3d, each of which can be rotated independently, and each has solenoids 1 to 7a, 7b, and 7c.

7d (indicated by 5oL1 to 5OL4 in the drawing) are connected.

As a result, for example, in the case of A4 size transfer paper 9b, the solenoids 7 for the reflectors 3c and 3d as shown in FIG.
Only the solenoids 7a and 7b for the reflectors 3a and 3b are turned ON while scanning the original.
By leaving F as the setting and performing site erase, an image can be formed only in an A4 size area.

Of course, all the solenoids 78 to 7d are turned off during front end erase, rear end erase, and charge removal. Similarly, in the case of A3 size transfer paper 9d, all solenoids 78 to 7
dt&ON, and in the case of B4 size transfer paper 9c, only the solenoid 7d for the reflection plate 3d is turned OFF in the image area.
FF and other solenoids 78 to 7c are always ON,
In the case of B5 size transfer paper 9a, only the solenoid 7a for the reflection plate 3a is turned on in the image area, and the other solenoids 7 are turned on.
By always turning off bits b to 7d, it is possible to perform site erasing according to the size of the transfer paper.

A flow chart of such ON/OFF control of the solenoids 78 to 7d is shown in FIG.

Moreover, according to this embodiment, not only when the power is turned off, but also when the power is turned on.
Even if the original pressure plate is left open, the solenoid 7 is not energized and the reflector 3 is in the state shown by the dashed line except during copying, so even if the document pressure plate is left open, the reflector 3 is This will block external light. This results in
The photoreceptor is not exposed to unnecessary light irradiation, reducing fatigue and deterioration of the photoreceptor.

Effects In the present invention, as described above, the reflection plate facing the exposure lamp is divided into transfer paper size pieces and each is provided independently and movably to eliminate reflection mJ'! Since it is movably displaced by the device, it is possible to erase the leading and trailing edges of the image, site erase, and remove static electricity from the photoreceptor using one exposure lamp for document exposure. This can be done easily and inexpensively.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a plan view, FIG. 2 is a schematic side view, FIG. 3 is a side view of a reflector, and FIGS. Timing chart, 6th
The figure is a flowchart.

Claims (1)

[Claims] In a copying apparatus that is provided with an exposure lamp that exposes the surface of a document, and a reflector that faces the exposure lamp and exposes the surface of the document with reflected light, the reflector is divided according to the size of the transfer paper and each is independently operated. When erasing on the photoreceptor, these reflecting plates are set individually according to the size of the transfer paper, and when static electricity is removed from the photoreceptor, the total reflection plate is placed at a position where the light from the exposure lamp is directly reflected toward the photoreceptor. A copying machine characterized by being provided with a movable reflector driving device.