JPS62147469A - Image former - Google Patents

Abstract

PURPOSE:To prevent a conveyor belt from shifting laterally, snaking, and twisting by providing a snaking preventing means which prevents a driving belt from snaking adjacently to the upper and outside edge parts of the driving belt. CONSTITUTION:The snaking preventing means 74 which prevents the driving belt 73 from snaking is provided at a position corresponding to the rotary suspension position of the top surface part of the driving belt 73 to a driving roller 71. The snaking preventing means 74 is formed of a thrust roller 75 and an abutting roller 76 and the thrust roller 75 is arranged so that its outer peripheral surface presses the top surface of the driving belt 73 and slants by a fine angle theta in the moving direction of the driving belt 73. The snaking preventing means 74 maintains the accurate rotation and sufficient linearity of the driving belt 73 and the abutting roller 75 contacts the driving belt 73 slantingly, so the belt is prevented completely from moving onto a flange. Conse quently, the conveyor belt is prevented from shifting laterally, twisting, and snaking, and an image shift on a transfer material is evaded, and an image of high quality is formed.

Description

[Detailed description of the invention] 3. Release 1! ! 7. The present invention is characterized in that a transfer material is made to face an image 111 bearing body carrying a toner image, and a discharge for transfer is carried out from the back side. For example, it relates to an image forming apparatus that obtains a transferred image on a transfer material by changing the corona decay area, and in particular, it forms a toner image at a plurality of image forming stations, and transfers the transfer material to each image station using a conveyor belt device. The present invention relates to an image forming apparatus that transfers toner images onto the same transfer material.

In this specification, the term "image forming apparatus" includes various color printing apparatuses such as a color copying apparatus, a color printer forming an output section of a computer, and a facsimile machine.

'Novel Todoroki Maru Ili'l, a type of image forming device,
Do multiple devices become black as their functions become more diverse? −
As well as reproduction by red, l'? Copying using multicolor toner such as , green, etc. is also possible.

As shown in FIG. 4, some duplicating devices have a plurality of image forming stations, form toner images of predetermined colors, and transfer the transfer material to each image forming station by a conveyor belt device. There is a structure in which toner images of different colors formed at each IIII image forming station are sequentially transferred to the same transfer member in an overlapping manner.

Furthermore, referring to FIG. 4, this type of copying apparatus will be explained in detail. Four image forming stations I, II, and (1) are sequentially arranged in parallel in the main body 1 of the copying apparatus, and each Image forming station 1. , II, m, and ■, toner images of cyan toner, magenta toner, yellow toner, and black toner are formed.

Image forming station 1. Il, m, and IV are equipped with photosensitive drums (image-tracking holders) 11, 12, 13, and 14. On their outer peripheries, there are primary coronas (j' is an electric current 21, 22, 24, and a developing device. 31, 32, 33, 34 and Kan' II: For (1) Ichiki 41, 42, 43, 44 and Cleanings 851, 52, 53, 54, respectively.

These image forming stations I, I1. m, ■ are beams j whose light intensity is modulated by an information signal after being weighed on the surface of the photosensitive drum LL, 12.13.14 by a primary corona charger 21.22.23.24; ,Iz,I
3.1. Scan the photosensitive drums 11, 12, 13, 14.1 and electrostatic W! form an image.

Each 1"r'e J latent image is made of cyan toner,
The developing devices 31, 32, 33, and 34 containing magenta toner, yellow toner, and black toner are used to develop cyan, magenta, yellow, black, and rack toner images. Each of these toner images is transferred to a conveyor belt device 6.
The color image is transferred to the transfer member P! by passing the transfer member P conveyed by the transfer member P by the transfer member P! − is formed.

In such a device, the m conveying belt device 61 is a thin liner, L
A conveyor belt 61a formed in an encircling shape using a body sheet or a screen mesh is suspended around a drive roller 63 and a driven roller 63a, and is rotated in the direction of the arrow. Then, the material P to be rolled is transferred to the absorption Ii charger 62.
It is sucked up in batches by a conveyor belt 61a1, and conveyed in a dense manner by a belt 61a.

Also, this conveyor belt! In order to prevent image shift on the transfer material P, the device 61 must accurately drive the conveyor belt 61a without causing lateral shift, meandering, twisting, etc. However, the conveyance belt 61a as described in 1- Because the belt 6ja is thin and wide, it is difficult to prevent the belt from shifting, meandering, or twisting. If the part collapses or 1. It wrinkled and was not practical.

For this purpose, it has been proposed that a transport belt 61a is used as the belt main body, and narrow drive belts 64 are mounted on both sides of the conveyor belt 61a to form a transport belt 65, as shown in FIG. It is difficult to make the lengths of the drive belts 64 at both ends of the belt completely the same, and due to such a difference in the length of the drive belts 64, the conveyor belt I/65 may be twisted, causing problems in practical use. It wasn't on point.

Also, as shown in FIG.
It has been proposed to form the hole a as a perforation belt 66, but in this case, pitch deviation of the feed fL 64a causes image deviation, so it is necessary to fabricate the perforation hole 64a with a pitch equal to the law iE. Therefore, there were problems in that the manufacturing process was complicated and the price was high.

5. For example, detect the misalignment of the conveyor belt.

A means for controlling the feed of the conveyor belt using this method has been proposed, but the conveyor belt device having the structure shown in L has a complicated detection stage for detecting minute deviations of the conveyor belt, and the detection means uses a complicated detection stage to detect minute deviations of the conveyor belt. As a result, a complicated control means having a control circuit for controlling the feed speed of the conveyor belt has become necessary.

Moxibustion "L's" [Kakumihata II was created in view of the problems mentioned above, and its purpose is to improve the structure of the conveyor belt of the transfer material conveyance device to prevent horizontal deviation, meandering, or twisting of the conveyor belt. Prevent!
Forming high-quality images on transfer materials + 4-function image formation! Another object of the present invention is to provide an image forming apparatus that can create color images without color shift.

j111 for getting old! The above objects are achieved by an image forming apparatus according to the present invention. To summarize, the present invention provides an image forming apparatus in which a transfer material is made to face an image carrier holding 111 toner images and a transferred image is formed on the transfer material, and ii. a conveyor belt to be moved, the conveyor belt having a belt main body that supports the transfer material, and an endless drive belt integrally provided at one edge of the belt main body;
The image forming apparatus is characterized in that the drive belt is driven by the drive roll.

According to a preferred embodiment of the present invention, a meandering prevention step for preventing meandering of the drive belt is provided adjacent to one and outer edge of the drive belt, and The first meandering prevention stage preferably includes a thrust roller that is driven by the rotation of the drive belt and applies a force to the drive belt in an overlapping direction with respect to its advancing direction, and an outer end of the drive belt. It is comprised of an abutment roller that comes into contact with the edge and restricts the movement of the drive belt in a direction perpendicular to the direction of travel of the drive belt.

From the first example onwards, the image forming apparatus according to the present invention will be explained in more detail with reference to the drawings. An embodiment of the present invention is illustrated in FIGS. 1-3.

In this embodiment, the present invention is suitably embodied in an electrophotographic copying apparatus having a plurality of image forming stations arranged in parallel as described above in connection with FIG. Only the conveying belt device portion for the transfer material is shown.

Referring to the drawings, the transfer material conveying belt device has an endless conveying belt 70 (the conveying belt)
70 is configured to rotate in the direction of the arrow by being suspended from a drive roller 71 having a rotating shaft 71a and a driven roller 77.

Further, according to the present invention, the conveyor belt 70 includes a belt main body 72 that statically suctions and conveys the transfer material, and a narrow drive belt 7 installed to extend on one side of the belt main body 72.
3.

The belt body 72 is made of, for example, an insulating screen mesh, and is particularly wrinkled to maintain good conveyance.
A material that is hard, does not twist or stretch, and is difficult to stretch is selected.

In addition, transferability and electrostatic absorption of the transfer material, which is usually used as transfer paper, are
For the purpose of improving the properties, the thickness and number of meshes of the belt body 72 are limited, and strong fibers such as Tetoron and 4i, 1 fat fibers are used, and 5O-1
It is most suitable to be made into a mesh. or, !
The belt main body 72 has a small coefficient of friction and is effective for the purpose described below.

The drive belt 73 is non-stretchable and has a thickness of O, for example.
, l" 1 mm 1 It is suitable to be made of a reinforcing rubber belt with a width of 10 to 40 mm.

Therefore, according to the invention, the conveyor belt) 70.

The drive belt 73 is driven by the drive roller 71, but since the drive belt I.73 has a large friction coefficient, the drive roller 71
Therefore, the belt body 72 is driven at a constant speed and rotates at a predetermined speed. On the other hand, the belt body 72 has a small coefficient of friction with the drive roller 71 and can slide on the drive roller 711. Wrinkles.

Prevents twisting, sagging, etc. 1 [Transportation bell]
・70 can rotate at a predetermined speed (one book can be rotated accurately).

No, the drive belt 73 has that! A meandering prevention/first stage 74 for preventing the drive belt 73 from meandering can be provided at an arbitrary position on the - face part, or preferably at the - face part corresponding to the position where it is suspended around the drive roller 71.

The anti-rubbing +lr stage 74 is formed by a thrust roller 75 and an abutment roller 76, and the thrust roller 75 has its outer circumferential surface pressing against the surface of the drive belt 73, and as shown in FIG. 73 is inclined by a total small angle indicated by 0. The angle 0 is preferably 5 to 30'.

When the drive belt 73 is driven, this thrust roller 75 is moved by J! ! , the drive receiver rotates in the direction of the arrow shown in FIG. 1 and 31-4 and in the direction α in FIG.
3, apply an outward force perpendicular to 1F with respect to the traveling direction.

Further, according to the present invention, the 4-13 contact roller 76 is provided.

It is provided adjacent to the outer end edge 73a of the drive belt 73. As can be understood from FIG. 2, when the driving belt 73 receives a force in this direction from the thrust roller 75, the end edge 73a of the first side of the belt is pressed against the abutting roller 76. il/, at the center part 76a of the outer peripheral surface of
The drive belt 73 is installed at an angle with respect to the drive belt 73 so as to be in contact with the drive belt 73. Therefore, the drive belt 73 is prevented from moving in a direction perpendicular to the traveling direction, and straightness is maintained.

1 - Drive belt 7 by means 74 in the twisted meandering prevention 1
3/11 - Precise rotation and 1 minute straightness are maintained. Furthermore, since the abutment roller 75 is in diagonal contact with the drive belt 73, the drive roller 71 has a flange (
The phenomenon that occurs when trying to maintain the straightness of the belt I by providing a flange) is completely prevented. There is no unnecessary wear on the end of the rotating belt 73 or an increase in belt driving force1.

In addition, in the present invention, the drive roller 71 is not operated! The contact portion with the Ih belt 73 is made of metal, etc., and the belt body 7
2 can also be made of a material having a smaller coefficient of friction, such as Teflon resin.

In addition, the WJ and moving belt 73 are made of non-stretchable metal or 4Htm.
The belt body 72 does not need to be made of synthetic rubber and molded with a mesh material embedded therein; for example, it can be made of metal, and the belt body 72 may be made of a synthetic rubber material with low volume resistance to prevent chassis lumps instead of slurry/mesh material. It is also possible to form it using a blank sheet.

Color Hole Vertical Difference] The image forming apparatus according to the present invention configured as described in 1 below,
The conveyor belt for conveying the transfer material is composed of the main body of the bell 1 for conveying the transfer member and a drive belt, and can prevent the occurrence of horizontal displacement, twisting, or meandering of the conveyor belt 11. - image deviation is avoided, and a high-quality image can be formed.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the transfer material conveying belt device of the image forming apparatus according to the present invention. FIG. 2 is a cross-sectional view taken along arrow A-A in FIG. 1. FIG. 11 is a view taken along arrow B in FIG. 2. FIG. 4 is a schematic explanatory diagram of an image forming apparatus in which a conventional transfer member conveyor belt device is installed in one device. FIGS. It is a perspective view showing the main parts of a conventional conveyance belt device for a transfer member. 70: @Transmission belt 71/Drive roller 72: Belt body 73: Drive belt 76/A/1 Abutment roller Agent Patent attorney 1: Kurahashi 1 Saki... Figure 2 Figure 3 Figure 4 ■mn I

Claims (1)

[Scope of Claims] 1) In an image forming device that faces a transfer material to an image carrier carrying a toner image and forms a transferred image on the transfer material, the image forming apparatus is rotated by a drive roller to convey the transfer material. The conveyor belt has a belt body that carries the transfer material, and an endless drive belt is integrally provided on one edge of the belt body, and the drive belt is driven by the drive roll. An image forming apparatus characterized by: 2) The friction coefficient between the belt body and the drive roller is made small so that the belt body easily slides on the drive roller, and the friction coefficient between the drive belt and the drive roller is made large so that driving is performed. 2. The apparatus of claim 1, wherein the belt is configured to be difficult to slide on the drive roller. 3) The device according to claim 1 or 2, further comprising anti-meandering means for preventing meandering of the drive belt adjacent to the upper and outer edges of the drive belt. 4) The anti-rubbing means includes a thrust roller that follows the rotation of the drive belt and applies a force to the drive belt in a direction perpendicular to its traveling direction, and an edge portion of the outer side of the drive belt. 4. The apparatus according to claim 3, further comprising an abutting roller that is in contact with the drive belt and restricts movement of the drive belt in a direction perpendicular to the direction of travel thereof. 5) The device according to any one of claims 1 to 3, wherein the belt body is an endless belt made of an insulating mesh or film, and the drive belt is a rubber endless belt.