JPH10203690A - Image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately perform a feed of transfer material without generating a phenomenon obliquely feeding the transfer material. SOLUTION: A transfer material 3 is opened by a stopper means 61, in the case of the transfer material 3 leading to a moving unit 37 from a second roller part 35, the transfer material 3 is opened from a condition interposing it by the second roller part 35. In this way, by only accuracy of the stopper means 61, a diagonal feed condition of the transfer material 3 is left as high accurately corrected, the transfer material 3 can be fed in a side of the moving unit 37.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus capable of feeding a transfer material to a moving body in a correct posture without causing skew of the transfer material.

[0002]

2. Description of the Related Art In a tandem type (serial array type) color image forming apparatus as an image forming apparatus, for example, a plurality of drums as image forming bodies are arranged in tandem. A color image is formed on the transfer material by sequentially transferring the toner images of various colors to the plurality of drums.

In this type of image forming apparatus, a transfer material is sandwiched between a pair of registration rollers, is sent to the moving body side by the rotation of the pair of registration rollers and is placed on the moving body, and the transfer material is moved along the moving direction of the moving body. Moving. Also, JP-A-2-2767
As disclosed in Japanese Patent Application Laid-Open No. 45-45, another image forming apparatus of this type has a stopper claw provided on an upstream side of a transfer material conveying path and a registration roller pair on a downstream side.

[0004]

However, in the system using the pair of registration rollers, when the pair of registration rollers conveys the transfer material from the paper feeding section to the moving body side, the phenomenon that the transfer material is sent obliquely, that is, the skew occurs. If this occurs, in order to correct this skew, the leading end of the transfer material must accurately project into the nip portion of the registration roller pair, and the registration roller pair is used to correct the skew of the transfer material. The correction ability is not so high.

In the method using a stopper claw and a pair of registration rollers, the correction ability is high because the skew of the transfer material is corrected by the stopper claw. However, the transfer of the transfer material is performed between the registration roller pair and the sheet feeding section. Since the operation is performed by the pair of grip rollers and the like, the operation of both the pair of registration rollers and the pair of grip rollers causes the correction state of the skew of the transfer material to be cancelled, and the skew of the transfer material may occur.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide an image forming apparatus capable of accurately feeding a transfer material without causing a phenomenon in which the transfer material is fed obliquely.

[0007]

According to a first aspect of the present invention, at least one or more image forming bodies, image recording means for recording an image on the image forming bodies, and a transfer position of the image forming bodies are moved. In an image forming apparatus that obtains an image by transferring an image to a moving body or a transfer material carried on the moving body, the transfer path of the transfer material between the paper feeding unit and the moving body includes A first roller unit that feeds the transfer material from the paper feeding unit, a stopper unit that corrects a state of the oblique feeding of the transfer material sent by the first roller unit, and a transfer unit that receives the transfer material from the first roller unit A second roller section for feeding the transfer material to the moving body side, wherein the stopper means releases the transfer material and the transfer material
The second roller unit releases the transfer material from the state where the transfer material is sandwiched when the transfer material reaches the moving body from the roller unit.

According to the first aspect of the present invention, when the transfer material reaches the moving body from the second roller portion, the second roller releases the transfer material. Therefore, the transfer material is inclined only by the accuracy of the stopper means. The transfer material can be fed to the moving body while the feeding state is corrected with high precision.

According to a second aspect of the present invention, the second roller portion includes a driving roller and a driven roller driven by rotation of the driving roller, and the driven roller presses the driving roller when the transfer material is sandwiched therebetween. The driven roller is separated from the drive roller when the transfer member is in contact with the transfer roller and is released.

According to the second aspect of the invention, when the transfer material is sandwiched between the driven roller and the drive roller, the driven roller presses and contacts the drive roller, so that the transfer material corrected with high precision can be accurately fed. In a state where the transfer material is released, the driven roller is separated from the drive roller, so that the transfer material can be moved toward the moving body by the first roller unit without hindering the correction of the transfer material with high accuracy.

According to a third aspect of the present invention, the driven roller presses and contacts the drive roller side after the transfer material enters the stopper means, and the driven roller separates from the drive roller after the transfer material enters the moving body. It is characterized by the following.

According to the third aspect of the present invention, since the impact when the transfer material comes out of the second roller portion toward the moving body is not transmitted to the image forming body through the moving body, the image can be accurately transferred to the transfer material. Can be.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a color image forming apparatus which is the image forming apparatus of the present invention. This color image forming apparatus converts a color image of a color original 1 into a transfer material 3 such as paper.
This is a device for transferring images to The color original 1 is a glass platen 5
The original is irradiated with light from a light source 7 on the original surface of the color original 1, and the reflected light from the color original 1 is guided to a color-magnification CCD (charge-coupled device) camera 11 through a rinse 9. The CCD camera 11 separates the reflected light into three primary colors of light (R: red, G: green, B: blue) and detects the light.

The three primary colors created by the CCD camera 11 are received by an IPU (image signal processing unit) 13 and images of BK (black), C (cyan), M (magenta), and Y (yellow) are obtained. A signal is generated, and each image signal is sent to the writing unit 15. The writing unit 15 includes BK, C, M, Y
According to the respective image signals, writing for one page by four laser beams is performed on the drums 17, 19, 21, and 23 as image forming bodies, thereby obtaining an electrostatic latent image. Next, the developing units 25, 27, 29, 31 give toner images of respective colors on the corresponding drums 17, 19, 21, 23, respectively.

The transfer material 3 shown in FIG. As shown in FIG. 1, the sheet feeding unit 33 and the moving body 37
A transport path 53 is provided between the
As shown in FIG. 7, a grip roller pair (first roller portion) 77,
A registration roller pair (second roller portion) 35 and stopper means 61 are provided.

The drums 17, 19, 21, 23 are arranged in a tandem type. A moving body 37 is disposed on the rear side of the registration roller pair 35 along the direction in which the drums 17, 19, 21, and 23 are arranged.

FIG. 2 shows the portion R in FIG. 1 and its surroundings. FIG. 2 shows the transfer material 3 fed out from the sheet feeding section 33, the pair of grip rollers 77, the pair of registration rollers 35, and the starting end 39a of the moving body 37. It is shown enlarged. The grip roller pair 77 has a driving roller 78 and a driven roller 79.
The drive roller 78 rotates in the CW direction by the motor 78a, so that the driven roller 79 rotates in the CCW direction,
The driving roller 78 and the driven roller 79 can feed the transfer material 3 in the T1 direction.

The registration roller pair 35 includes a driving roller 39.
And a driven roller 41. The drive roller 39 is rotatably supported by a side plate (not shown) of the main body. The driving roller 39 is rotated in the CW direction by the motor 43, so that the driven roller 41 rotates in the CCW direction. The driven roller 41 is rotatably supported by a bracket 41a, and the bracket 41a is rotatably supported about a central axis 41b. The bracket 41a is supported by the spring 41d so as to be elastically lifted in the Z1 direction with respect to the fixing portion 41c on the main body side.
The solenoid 41e can move in the Z2 direction against the force of d.

The stopper means 61 includes a grip roller pair 7
7 is a substantially L-shaped stop member for temporarily stopping the transfer material 3 sent in by Z7, and a solenoid 61b pushes a stopper portion 63 protruding in the Z2 direction against a force of a spring 61c about a center shaft 61a. Can move in any direction. That is, as shown in FIGS. 2 to 4, the stopper 63 can be withdrawn from the transport path 53.

As shown in FIG. 1, a pair of grip rollers 77
A guide body 44 for guiding the transfer material 3 is provided around the pair of registration rollers 35 and the start end 39 a of the moving body 37. The guide body 44 includes two guide plates 49, 51.
These guide plates 49 and 51 are arranged at upper and lower positions with respect to the transport path 53 of the transfer material 3. The moving body 37 is moved in the T direction by two rollers 45 and 47.

As shown in FIG. 1, the drums 17, 19, 2
Transfer portions 81, 83, 8 are provided at positions corresponding to 1, 23, respectively.
5,87 are arranged. A fixing unit 91 is disposed downstream of the transfer unit 87, and the fixing unit 91 has rollers 93 and 95. Drums 17, 19, 21,
23, the cleaning units 101, 10
3, 105, 107 and charging units 111, 113, 115,
117 are arranged respectively.

In the embodiment of the present invention, the image recording means 1
Reference numeral 50 denotes the writing unit 15, the developing units 25, 27, and 2.
9, 31, charging units 111, 113, 115, and 117, and cleaning units 101, 103, 105, and 107.

Next, the operation of the image forming apparatus will be described with reference to FIGS. In a standby state in which the transfer material 3 does not pass, the bracket 41a maintains a horizontal state as shown in FIG. 3, the driven roller 41 is in contact with the drive roller 39, and the stopper claw 63 is in the position shown in FIGS. Thus, the transport path 53 is closed. In FIG. 1, the transfer body 3 is fed in advance to a paper feed unit 33, and the force for feeding the transfer material 3 to the stopper claw 63 is
This is performed by the grip roller pair 77, and the grip roller pair 7
The registration material pair 7 and the registration roller pair 35 take the timing of the transfer material 3 with the image obtained by the CCD camera 11, and the transfer material 3 is sent to the moving body 37 side without causing skew.

As shown in FIG. 2, the grip roller pair 77
When the transfer material 3 is fed into the transport path 53, the driven roller 41 is in contact with the drive roller 39. However, when the leading end portion 3a of the transfer material 3 protrudes into the stopper claw 63 as shown in FIG. 41e operates, and the driven roller 41 is lowered in the Z2 direction, and the driven roller 41 is separated from the driving roller 39.

Then, as shown in FIG. 3, when the leading end portion 3a of the transfer material 3 enters and hits the stopper claw 63,
The skew of the transfer material 3 is corrected with high accuracy only by the accuracy of the stopper claw 63, and becomes a proper posture in the feed direction, the solenoid 41e is operated, the driven roller 41 is raised in the Z1 direction, and the driven roller 41 is The side is pressed and contacted by the force of the spring 41d. Then, as shown in FIG.
Is lifted in the Z1 direction to open the transport path 53 and transfer the transfer material 3
To release. As a result, the transfer material 3 is further fed by the force of the pair of grip rollers 77 in a state where the transfer material 3 is corrected with high accuracy by the stopper claws 63, and when the leading end portion 3 a of the transfer material 3 enters the moving body 37, it is driven. Roller 41 is Z2
And separates from the drive roller 39.

The transfer material 3 that has reached the moving body 37 is sequentially transferred by the drums 17, 19, 21, and 23 to the transfer units 81, 83, and 8 while being transported in the T direction by the moving body 37 shown in FIG.
At 5,87, the toner image is transferred. At the stage after the transfer section 87 where the transfer process is completed, the transfer material 3 is transferred to the fixing unit 9.
The toner image is fixed at 1 and is discharged from the main unit discharge roller portion to the outside of the apparatus. Drums 17, 19, 2 whose transfer process has been completed
The toner and the like remaining on the surfaces of the first and second cleaning units are cleaned by the cleaning units 101, 103, 105, and 107.
It is charged again by the charging units 111, 113, 115, 117 to prepare for the next latent image.

[0027]

As described above, according to the first aspect of the present invention, when the transfer material reaches the moving body from the second roller portion, the second roller releases the transfer material. The transfer material can be fed to the moving body side while the state of the oblique feed of the transfer material is corrected with high accuracy only by the accuracy.

According to the second aspect of the present invention, when the transfer material is sandwiched between the driven roller and the drive roller, the driven roller is brought into contact with the drive roller by pressing, so that the transfer material corrected with high precision can be accurately fed. When the roller is opened, the driven roller is separated from the drive roller, so that the transfer material can be moved toward the movable body by the first roller unit without hindering the correction of the transfer material with high accuracy.

According to the third aspect of the present invention, since the impact when the transfer material comes out of the second roller portion toward the moving body is not transmitted to the image forming body through the moving body, the image can be accurately transferred to the transfer material. it can.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of an image forming apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a transfer material feeding operation.

FIG. 3 is a diagram illustrating a transfer material feeding operation.

FIG. 4 is a diagram illustrating a transfer material feeding operation.

[Explanation of symbols]

 Reference Signs List 3 transfer material 17, 19, 21, 23 drum (image forming body) 35 registration roller pair (second roller section) 37 moving body 39 drive roller 41 driven roller 61 stopper means 77 grip roller pair (first roller section) 150 images Recording means

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Nobuyuki Sato 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Company, Ltd.

Claims (3)

[Claims] An image forming apparatus comprising: at least one or more image forming bodies; an image recording unit that records an image on the image forming bodies; and a moving body that moves a transfer position of the image forming bodies. An image forming apparatus for transferring an image to a transfer material carried thereon to obtain an image, comprising: a first roller for sandwiching the transfer material from the paper supply unit in a transfer path of the transfer material between the paper supply unit and the moving body; Unit, stopper means for correcting the state of oblique feeding of the transfer material sent by the first roller unit, and a second roller unit for receiving the transfer material from the first roller unit and sending the transfer material to the moving body side Wherein when the stopper means releases the transfer material and the transfer material reaches the moving body from the second roller portion, the second roller portion releases the transfer material from a state in which the transfer material is sandwiched. Image forming apparatus. A second roller portion including a driving roller and a driven roller that is driven by the rotation of the driving roller. When the transfer material is sandwiched between the driven roller and the driven roller, the driven roller comes into contact with the driving roller to open the transfer material. The image forming apparatus according to claim 1, wherein the driven roller is separated from the driving roller in a state in which the driving roller is driven. 3. The driven roller is pressed against the drive roller after the transfer material enters the stopper means, and the driven roller is separated from the drive roller after the transfer material enters the moving body. 3. The image forming apparatus according to 2.