JPS5983186A - Holder of belt-like photosensitive body - Google Patents

Abstract

PURPOSE:To eliminate the possibility of generating the winding habit on a belt- like photosensitive body even if a recorder is held unoperated for a long period of time and to prevent a trouble such as defective exposure and defective development by giving tension on the belt-like photosensitive body only while the recorder is in operation. CONSTITUTION:A copying machine is started and when a belt-like photosensitive body is run around a driven roll 3 and a tension roll 4 according to the revolution of a driving roll, a solenoid 23 is energized to retreat a movable iron core 24 into the solenoid 23. An oscillating rod 22 is turned in the direction of an arrow A against the energizing force of a sprint 25. Then the roll 4 presses the rear of the photoreceptor 1 toward the front thereby holding the tension the photosensitive body 1. While the copying machine is not in operation, the solenoid 23 is held not to be energized and therefore the rod 22 is energized by the spring 25 and is turned in the direction opposite from the arrow A, to release the roll 4 from the pressing and to relax the tension of the photosensitive body 1.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a holding device for a belt-like photoreceptor in a recording device such as a copying machine, and more particularly, to a device for holding a belt-like photoreceptor in a tensioned state only when a photographing machine or the like is in operation.

The present invention relates to a holding device for a belt-like photoreceptor that can release the tension of the belt-like photoreceptor when the belt-like photoreceptor is not in operation.

PRIOR TECHNOLOGY There are many copying machines and recording devices that use a belt-shaped photoreceptor. If the recording device is left unused for a long period of time, the belt-shaped photoreceptor will become curled up by the rollers that hold it, making it difficult to expose flat surfaces. This has caused various problems such as poor focus and uneven development due to variations in the development gap. Such curling tends to occur in small diameter roller portions such as tension rollers.

Purpose This invention was made in order to eliminate the drawbacks of the conventional recording apparatus equipped with a belt-shaped photoreceptor as described above. It is an object of the present invention to provide a holding device for a belt-like photoreceptor that can hold the belt-like photoreceptor and release the tension of the belt-like photoreceptor when the belt-like photoreceptor is not in operation, thereby preventing curling.

Configuration This invention will be explained below based on the embodiment shown in the drawings.
゜ Fig. 1 is a schematic side view showing the internal structure of a copying machine equipped with a belt-like photoreceptor holding device according to the present invention. The belt is wound around and attached to a driving roller 2, a driven row 23, and a tension row 24 that presses the back surface of the belt-shaped photoreceptor 1 in the front direction to apply tension to the photoreceptor 1. Reference numeral 5 denotes a charger, and 6 an exposure optical system, which forms an image of an original 8 on an original table glass 7 on the photoreceptor 1. 9 is a developing device, i.

Reference numeral 11 indicates a transfer device, 11 a cleaning device, and 12 a static eliminator. The transfer paper 14 fed from the paper feed section 13 is
The powder image is transferred at the transfer section 10, fixed at the fixing section 15, and sent out of the machine.

2 and 3 show the operating mechanism of the tension roller 4. FIG. 2 shows the tension roller 4 holding the belt-shaped photoreceptor 1 in a tensioned state, and the third
The figure shows a state in which the tension on the photoreceptor 1 is released.

The tension roller 4 is rotatably attached to one end of a swinging rod 22, which is pivotably attached at approximately the center by a shaft 21 attached to a machine frame (not shown) in a direction perpendicular to the traveling direction of the photoreceptor 10. ing. The other end of the swinging rod 22 is attached with the tip of a driving iron core 24 of a solenoid 230, which is attached downward to a machine frame (not shown).When the solenoid 23 is energized, the movable iron core 24 moves into the solenoid 23. The end of the swinging rod 22 to which the movable core 24 of the swinging rod 22 is attached is then pulled upward. Furthermore, one end of a spring 25 is attached to the side end of the tension roller 4 of the swinging rod 22, and the other end of the spring 25 is attached to a machine frame (not shown) located above the swinging rod 22. As a result, the m-moving rod 22 is biased in a direction in which the tension roller 4 is pulled upward.

The holding device for the belt-shaped photoreceptor is configured to hold a second
As shown in the figure, the solenoid 23 is energized and moved, the movable iron core 24 is retreated into the solenoid 23, and the swinging rod 22 is moved in the direction of the arrow in FIG. 2 against the biasing force of the spring 25. The tension is lowered by being rotated to
) 4 presses the surface of the photoreceptor 10 in the front direction to hold the photoreceptor 1 in a stretched state.

Next, when the copy mode is inactive, the energization to the solenoid 23 is stopped, as shown in FIG.
The swinging rod 22 is biased by the spring 25 and rotated in the direction of arrow B in FIG. 3, and the tension roller 4 is released from being pressed against the photoreceptor 1, thereby loosening the tension on the photoreceptor 1.

Effects As described above, the present invention provides a jitter to the belt-shaped photoreceptor only when the recording device is in operation, so that even if the recording device is left inactive for a long time, the belt-shaped photoreceptor is not wound. It has excellent effects in that it does not cause curls and there is no risk of troubles such as poor optical performance or poor 3J images. In particular, the present invention is highly effective in devices that are left unused for a relatively long time, such as low-copy-volume copying machines.

Note that the effectiveness will be further increased if the tension roller for releasing the tension on the belt-like photoreceptor is selected from among the rollers around which the belt-like photoreceptor is wound, having a smaller diameter.

[Brief explanation of drawings]

Fig. 1- is a schematic side view showing the internal structure of a copying machine equipped with a belt-like photoreceptor holding device according to the present invention, and Fig. 2 shows an embodiment of the present invention with the belt-like photoreceptor stretched. FIG. 3 is a side view showing the same embodiment in a state where the belt-shaped photoreceptor is not bent. 1... Belt-shaped photoreceptor 4... Tension roller 22... Rocking rod 23... Renoid 24... Movable iron core 25... Spring element
Figure 1 - 567 - Figure 2 Figure 7 Figure 3

Claims (1)

[Claims] 1. A holding device for a belt-like photoreceptor having a tension roller that applies tension to the belt-like photoreceptor, wherein the tension roller moves between a position where tension is applied to the belt-like photoreceptor and a position where the tension is released by an operating member. The tension roller is movably attached to the machine frame, and when the belt-like photoreceptor is traveling, the tension roller is moved by the actuating member to a position where tension is applied to the belt-like photoreceptor. A holding device for a belt-shaped photoreceptor.