JPS59114209A - Zigzag control device of endless belt - Google Patents

Abstract

PURPOSE:To facilitate the zigzag control and the exchange of an endless belt by providing regulation means to be fitted in guide members provided on both sides of the belt and retreated temporarily. CONSTITUTION:On both sides of a photo-sensitive belt 4, perforations 29 are perforated, and sprocket wheels 31 and 32 are rotatably provided on a support shaft 33 on the outsides of the belt for fitting in the perforations 29. In the center part of the support shaft 33 of the sprocket wheels 31 and 32, levers 34 and 35 are provided to be rotated round a shaft 36. The shaft 36 is fixed on the outside device 1, and on the levers 34 and 35, springs 37 are fitted to keep the sprocket wheels 31 and 32 in touch with a roller 7. This construction permits to facilitate the control of the zigzag movement and the exchange of the belt.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a meandering control device for an endless rotating belt. The device shown in Figure 1 is a system that forms a toner image on the surface of an endless rotating belt that serves as an image bearing member and displays it as a display image. It is a highly reliable device that can be manufactured at a relatively low cost.

For example, a terminal device that reproduces and displays as a visible image image information converted into an electrical signal that is calculated or read and output from a computer, image reading device, etc., or image information stored as a soft copy on a magnetic tape, etc.; It is also utilized as an image monitor device IT in office automation equipment such as a reader device or photographic device, and other image-related equipment.

In Fig. 1, 1 is a vertical device outer casing, and 2 is a display image viewing window formed large on the front surface of the outer casing, and is generally covered with a -M bright plate 2a such as a force glass. 05, 6, and 7 are six rotating rollers arranged horizontally in parallel to each other in the upper and lower parts of the outer case of the device, and 4 is an endless belt that is an image bearing member that is suspended and immersed in the six rotating rollers. It is. The roller 5 is rotationally driven by a motor 8 as a driving roller. The tension roller 6 is always biased in the A direction by a biasing member (not shown) to apply tension to the belt 4. The belt 7 is freely supported by a driven roller for one rotation, and the belt portion between the cough row 27 and the drive row 25 is set at both ends -25 and 7 so that it is parallel to the display image viewing window. has been done.

9 is an LE placed inside the belt part between rollers 6 and 7.
An exposure device such as a D array/liquid crystal shutter array @ PLZT shutter array, 10 is a developing device disposed opposite to the exposure device on the outside of the belt portion between rollers 6 and 7, and 6 is an operation panel.

For example, the endless belt that serves as an image carrier has a base layer that is a transparent sheet such as a polyester sheet, and a very thin layer of metal is deposited on the outer surface of the belt to provide conductivity while substantially maintaining transparency. It is entirely flexible and has a photosensitive material layer (photoconductive Jt4) such as CdS formed on the side.
The belt 4 is suspended and supported by the above six rows 25 to 7 with the optical material layer side facing outward.The belt 4 is rotated at a predetermined speed in the direction of the arrow by the rotation of the drive row 25 by the motor 8. dynamically driven.

Toner images to be displayed are sequentially formed on the outer peripheral surface by the action of the exposure device 9 and the developing device 10. Image formation in this example device is a non-charging, simultaneous exposure toner image formation method.
The detailed principle can be found in, for example, Japanese Patent Application No. 197410/1983.
It is disclosed in No. 57-151278 and the like.

The belt surface on which the image has been formed after passing through the image forming sections 9 and 10 is rotated to a position within the range of the image viewing window 2 by the subsequent rotation of the belt 4, and once stopped, and the image is displayed on the window section 2. will be done. After a predetermined period of time has elapsed, or by operating a button on the operation panel 6, the seatbelt 4 is rotated again, and the next display image is positioned in the window 2, and the belt is temporarily stopped and a fist image is displayed. By repeating this process, images are displayed in sequence.

Generally, in a device including an endless rotating belt, it is necessary to take measures to prevent meandering movement of the belt during the rotation process of the belt. For example, in the belt-rotating image forming apparatus as in the above example, meandering of the belt 4 greatly reduces the quality of the formed image, so it is necessary to strictly prevent the belt from meandering.

Conventionally, as a belt meandering prevention means, a plurality of σ2 protruding pawls 12 are provided at both ends of the row 211 as shown in FIG. This is to prevent the belt from meandering and to transmit the driving force of the row 211 to the belt 13.

Alternatively, as shown in FIG. 6, guide grooves 1 are provided at both ends of the roller 15.
6 is provided and square belts 18 provided at both inner ends of the belt 17 are engaged with the guide groove 16 to prevent the belt from meandering.

However, both meandering prevention means are limited to the endless belt 16.1.
If the rollers 7 are replaced by being pulled out in the direction of the center axis of the rollers 11 and 15 (towards the front of the drawing in FIG. 1), the following inconvenience occurs.

First, in the roller 11 shown in FIG. 2 with protruding pawls 12 provided at both ends, the belt cannot be replaced unless the protruding pawls 12 are completely separated from the perforations 14. A movable roller such as 6 must be biased significantly. This requires extra space and makes the device larger.

Furthermore, when installing a new belt, care must be taken to prevent the protruding pawls 12 from hitting the inner surface of the belt and damaging it, which results in a time-consuming replacement.Similarly, there are guide grooves on both ends of the roller shown in Figure 3. 16, it is necessary to completely separate the guide groove 16 and the inner corner belt 18 when replacing the belt, so it is necessary to use a movable roller such as the burnt tension row 26 with a large deviation. becomes. Further, when the belt is attached, the square belt 18 may get caught on the roller end, the guide #16, etc., and the photosensitive surface of the belt may be damaged.

The present invention has been made in view of the above points, and its purpose is to control meandering of the belt in a device in which an endless belt is suspended around a plurality of rollers, and to easily replace the belt in the axial direction of the rollers. The goal is to provide a new device that can.

That is, the present invention comprises a guide member provided at both outer ends of an endless rotary belt and arranged along the conveying direction of the belt, and a temporarily retractable regulating means that engages with the guide member. The gist of the present invention is a meandering control device for an endless belt, which is characterized by the following.

4 and 5 show a belt rotation type image display device equipped with a belt meandering control device according to the present invention, and the first
Components that are the same as those in the illustrated device are given the same reference numbers.

Reference numeral 27 denotes a belt meandering control device according to the present invention, which is disposed at the end of the driven roller 7. The surface of the row 27 is subjected to chrome plating, Teflon coating, etc. in order to suppress the M vibration force to a low level. Also, relief grooves 28 are provided at both ends of the roller 7.
are provided, and perforations 29 are perforated at both ends of the photoreceptor belt 4 corresponding to the grooves. On the other hand, the tin rocket wheel 5 has an outer Ku protruding pawl 30 on the outer surface of the belt so as to engage with the perforation 29.
1.52 is rotatably provided on the support shaft 63. The axial movement of the Sugerocket wheels 31 and 32 is supported by the support shaft 63.
is regulated against.

A lever 34.35 is provided at the center of the support shaft 66,
This lever 34,35 can be pivoted about an axis of rotation 66. The rotating shaft 66 is fixed to the device exterior casing 1. A lever 34.35 KU spring 67 is suspended to bias the sedge rocket wheel 31.32 against the row 27.

A hook 68 is provided below the support shaft 66.

This is for temporarily locking the support shaft 63 in order to release the engagement between the sprocket wheels 31 and 32 and the perforations 29 when the belt 4 is removed.

Therefore, when the belt rotation is driven, the sprocket wheel 61.
The protruding claw 60 of 62 is the perforation 2 on the belt 4 side.
9 from the outside and engages with it, and its beautiful projection claw 60
The tip of the belt 4 is fitted into the relief #2B on the roller 7 side, so that the meandering of the belt 4 is restricted. Also roller 7
By subjecting the outer circumferential surface of the belt to the low-magnification treatment as described above, the ME action power of the belt is reduced and a large lateral force is prevented from acting on the tin rocket wheels 31-32, which are regulating members.

On the other hand, when the belt 4 is temporarily removed from the rollers and reattached, the support shafts 66 of the sprocket wheels 61 and 62 are connected to the four parts of the support levers 64 and 65.
Push down against the force.

By hooking and locking the hook 68, the released MK is held from the roller 7. Also, the tension roller 6 is slightly biased in the belt loosening direction. Next, if the belt 4 is pulled and moved in the axial direction of the roller 7, the roller 7 will not have the protrusion 12 as in the example in FIG. 2, or the roller 7 will be on the side of the belt 4 as in the example in FIG. Since there is no engaging protrusion 18 and the tin rocket wheels 61 and 62 are not engaged with the belt, the belt 4 is easily and smoothly removed from the rollers. Belt 8 can be installed without fear of damaging belt 4 for the same reason.

It can be done easily and smoothly. After the belt 4 is attached to the roller 7, it is tensioned by the tension roller 6, and the shaft 66 is released from the hook 68, so that the protruding pawls 60 of the sprocket wheels 61 and 62 are secured to the perforations 29 of the belt 4. complete the installation.

6 and 7 show other examples of the meandering control device 27.
In this example, in place of the perforations 29 of the belt 4 in the examples shown in Figs. In the case of a horizontal lever, the rollers 4o and 41 are located between the protruding walls 69 and 69 on the outside of the belt 4 to guide the rotation of the pel 840. This prevents meandering movement of the belt.

On the other hand, the removal and reinstallation of the roller of belt 4 is done in the fourth step.
・You can do it in the same way as in the example in Figure 5.

In this case, the belt can be easily removed and reinstalled.
This can be done without risk of damaging the belt.

Although the belt of an image presentation device has been described above as an example, the present invention is not limited to this, but can be widely used as a belt meandering regulating device for devices that generally have endless rotating belts.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional side view of an example of a belt rotation 0 type image display device, FIGS. 2 and 6 are partially cutaway slope views of examples of a conventional belt meandering prevention mechanism, and FIG. 4 is according to the present invention. FIG. 1 is a longitudinal cross-sectional side view of an example image display device equipped with a belt meandering restriction device, FIG. 5 is a partially cutaway slope view of the restriction device portion, and FIG. 04 is an endless rotary belt as an image bearing member, 5-7
9 and 10 are the exposure device for image formation and the imager 0

Claims (1)

[Claims] (1) A guide member provided at both outer ends of the endless rotating belt and arranged along the conveying direction of the belt; and a temporarily retractable restriction means that engages with the guide member. A meandering control device for an endless belt characterized by: