JP2612877B2 - Transfer material transfer device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a transfer material transport device, and more particularly, to a structure of a registration roller for transporting a transfer material such as transfer paper used in a copying machine.

(Prior Art) As is well known, in a copying machine, a visible image on a photoconductor is electrostatically transferred to a transfer material such as plain paper. A transfer material feeding device having a structure as shown in FIG. 3 is provided.

That is, the copying machine shown in FIG. 3 is a color copying machine. The outline of the copying machine is as follows. This copying machine faces a photosensitive drum 1 rotatable in one direction and a transfer position of the photosensitive drum 1. And a feeding device 3 for feeding a transfer material to the conveying belt 2. The photosensitive drum 1 is provided around the photosensitive drum 1. 1, an exposure device 4, a developing device 5, and a cleaning device 6 as image forming means are arranged.

On the other hand, the transport belt 2 is a component for eliminating the complexity of the structure due to the provision of a transfer material gripping mechanism or the like that occurs when a transfer drum that can contact and separate from the photosensitive drum is used. At the time of image transfer on the drum 1, the transfer material placed on the upper surface is moved in a direction to contact the photosensitive drum 1, and at the time of non-transfer, the transfer material is moved to the photosensitive drum 1.
It is configured to be able to move to a position to be separated from the camera. Therefore, the photosensitive drum 1 is provided inside the transport belt 2.
The transfer device 7 is disposed at a position corresponding to the transfer position.

The transfer material feeding device 3 of the copying machine provided with such a transport belt 2 is located at an upper position in one of the reciprocating directions of the transport belt 2, and includes a feed roller 3A and the feed roller 3A. The paper feed cassette 3B is located on a feed path that is continuous with the paper feed cassette 3B.

In the copying machine having such a structure, when the image on the photosensitive drum 1 is transferred, the transfer material is fed out from the paper feed cassette 3B in the transfer material feeding device 3 via the feeding roller 3A, and the transfer is performed. A registration roller 8 located in a feeding path between the material feeding device 3 and the conveying belt 2 sets a feeding timing for obtaining synchronization between the image position on the photosensitive drum 1 and the movement of the transfer material. The transfer material is transferred to the conveyor belt 2 (for example, see Japanese Patent Application Laid-Open No. 58-19 / 1983).
8062, JP-A-50-63941).

By the way, as described above, when the structure for feeding the transfer material to the transport belt is positioned above the transport belt, the type of the transfer material fed from the feeding device,
In particular, depending on the thickness, normal transfer to the transfer material may not be performed.

That is, the feeding device is positioned above the transport belt because the transfer material placed on the transport belt may protrude from the transport belt when the belt moves backward. Although it is from consideration to not hinder, by this position setting, for example,
When a thick transfer material is fed out and the rear end is released from the feeding roller, the rear end of the transfer material is hit against the transport belt by its own weight and stiffness, so-called restoring force. As a result, the transport belt itself vibrates in a wavy state. Therefore, when vibration occurs in the transport belt, a part of the transfer material reaching the transfer position with the photosensitive drum cannot maintain a proper transfer distance with the surface of the photosensitive drum, and normal transfer cannot be expected.

(Purpose) In view of the above, an object of the present invention is to solve the problems of a conventional transfer material transporting apparatus, particularly, a transporting apparatus using a transporting belt.
It is an object of the present invention to provide a transfer material transporting apparatus that can perform normal image transfer on the transfer material regardless of a difference in the type of the transfer material such as the thickness of the transfer material.

(Structure) In order to achieve this object, the present invention provides a transport belt which is close to an image transfer portion of a photoconductor and is movable in a direction in which a transfer material to be subjected to image transfer is transported toward the image transfer portion. A feed position which is located at a higher position in one of the stretching directions of the transport belt and feeds out the transfer material to the transport belt, a transport path of the transfer material formed by the transport belt, and a feed of the transfer material. The transfer belt is constituted by a pair of rollers which are located between the transfer belt and the transfer material delivery side of the apparatus, and are opposed to each other with the conveyance belt interposed therebetween. A registration roller having a roller that is provided detachably and rotates following the belt when the belt is in contact with the belt, wherein the registration roller is at least the feeding device. Transfer material is fed out, the rear end is to propose to make it is moved away from the conveyor belt after being placed on the conveyor belt.

According to the present invention, since the rear end of the transfer material fed from the transfer material conveyance device is placed on the conveyance belt and then separated from the conveyance belt, the registration roller places the rear end of the transfer material on the conveyance belt. The transmission of vibrations on the conveyor belt that occurs at the time of the placement is stopped by the registration rollers.

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIG. 1 and FIG.

FIG. 1 is a sectional view showing a case where the transfer material transporting device according to the embodiment of the present invention is applied to a color copying machine using a reciprocating transporting belt.

The feature of the present embodiment is that a registration roller for setting the time of rapid transfer of the transfer material fed from the transfer material feeding unit to the photoreceptor is provided so as to be capable of coming into contact with and separating from the transport belt. The point is that the separation roller separation time is set.

First, before describing an embodiment of the present invention, the structure of a color copying machine to which the transfer material transporting device according to the embodiment of the present invention is applied will be described.

That is, the color copying machine 10 shown in FIG. 1 is wound around a plurality of pulleys 11, 12, and 13 rotatably supported in the copying machine main body, and in FIG. A movable belt-shaped photoconductor 10A is provided.Around the photoconductor 10A, a pre-charging device 10B and an exposure device 10 for performing a copying process along the moving direction of the photoconductor 10A are provided.
C, a developing device 10D, and a cleaning device (not shown) are arranged respectively.

The above-described exposure apparatus 10C includes an exposure light source 10C2 for an original on a document table 10C1 which is disposed at the top of the copying machine and is reciprocally movable, and a converging light transmitter 10C3 for guiding reflected light from the original to the photoconductor 10A. And a filter (not shown) for color-separating the light from the transmission body 10C3.

Then, the developing device 10D accommodates a plurality of color toner developing sleeves therein, and is rotatable so that any one of the color toner developing sleeves selectively faces the photoconductor 10A in accordance with the color separated by the filter. It is composed of a cylinder.

The cleaning device includes a static elimination device having a known structure and a toner removal device.

In FIG. 1, reference numeral 10F denotes a static elimination lamp for recovering the deterioration of the photosensitive member, and reference numeral 10G denotes an eraser.

On the other hand, a transfer device 10H is disposed at a position passing through the developing device 10D in the moving direction of the photoconductor 10A. The transfer device 10H includes a photoconductor 10A with a transfer path of the transfer material S interposed therebetween.
The feeding path of the transfer material S is
It is composed of 14.

That is, the transport belt 14 is driven around a pair of rollers including a driving roller and a driven roller, and is capable of reciprocating in conjunction with the reciprocating movement of the document table 10C1 in the exposure apparatus 10C. Photoreceptor in reciprocable movement
The transfer device 10H described above is disposed inside a position facing the photoconductor 10A, and an adjusting member 15 that is formed of an eccentric cam and adjusts the pressing state of the conveyor belt 14 against the photoconductor 10A is provided inside the vicinity of the same. Is arranged. This conveyor belt
Reference numeral 14 denotes a roller which can swing about one of a pair of rollers, in the figure, a roller which has passed through the photoconductor 10A as a fulcrum. At the time of transfer, the transfer material S on the transport belt 14 is transferred to the photoconductor 10A.
The transfer material S moves in a direction to approach or contact A, and moves in a direction to separate the transfer material S from the photoconductor 10A during non-transfer.

Further, inside the position of the transport belt 14 which has passed the position facing the photoreceptor 10A, the belt is opposed to the transfer belt S to neutralize the transfer material S to facilitate neutralization by electrically neutralizing the transfer material S. The device 16 is disposed, and near one end of the belt in the reciprocating direction of the belt and near the end where the static eliminator 16 is located, there are provided rollers that are in contact with each other across the transfer path of the transfer material S. A heating and fixing device 17 is disposed.

The above is the structure of the copying machine to which the transfer material conveying device according to the embodiment of the present invention is applied. The operation state of the copying machine will be described later in accordance with the operation of the present embodiment.

On the other hand, the transfer material transport device 18 according to the present embodiment is located in front of the portion facing the photoconductor 10A in the forward movement direction of the transport belt 14 described above.

That is, as shown in FIG. 2 (A), the transfer material conveying device 18 includes a feeding portion 18A located in front of the photoreceptor 10A at the time of forward movement of the conveying belt 14 and located above the photoreceptor 10A, and
And a registration roller 18B located in the conveyance path of the transfer material S formed by the conveyance belt 14.

The above-described feeding unit 18A includes a half-moon-shaped feeding roller 18A2 capable of contacting the uppermost one of the transfer materials S stored in the feeding cassette 18A1, and a transfer material fed from the cassette 18A1. The registration roller 18B is provided with a feed roller 18A3 for holding and feeding the transfer material S at least at the leading end of the transfer material S at the transfer portion of the photoconductor 10A. It is composed of a pair of rollers arranged at a position where the transfer material S can be pinched and conveyed until the transfer material S is attracted. This registration roller
The transfer belt 18 is opposed to the transfer belt 14, and one of the transfer belts 18, that is, the transfer material S on the mounting surface side of the transfer belt 14 is provided so as to be able to contact and separate from the transfer belt 14. The rollers of the registration rollers 18B located inside the conveyor belt 14 are always in contact with the conveyor belt 14 and transmit the rotation obtained from the conveyor belt 14 to the roller 18B1 facing the roller.

One of the registration rollers 18B 18B1 is provided so as to be able to contact and separate from the conveyor belt 14 because the color toner attached on the belt 14 is transferred to one of the registration rollers 18B 18B, and the color toner is transferred. This is to prevent the material S from adhering to the image transfer surface.

Then, one of the registration rollers 18B 18B
Reference numeral 1 denotes a feeding unit 18A as a contact / separation machine for the transport belt 14.
After the rear end of the transfer material S fed out of the transfer material S is placed on the conveyor belt 14, the transfer material S is separated from the conveyor belt 14, and is set to come into contact with the conveyor belt 14 when the transfer material S is fed out again. .

Such a contact / separation relationship between the registration roller 18B and the conveyor belt 14, in particular, the setting of the separation time, for example, the conveyor belt
In the case of a copying machine of a type in which a single-color copy is performed by a reverse rotation start signal to the drive roller at the time of the backward movement of 14 or by using the above-described reciprocating conveyor belt, the first transfer of the transfer material S is performed. After the transfer is completed, a second transfer material feeding is performed, and the transfer material is transferred to a transfer position with the photoconductor by a signal of a timing to start a forward movement. In this case, the length of the transfer material is According to the timing, the rear end of the transfer material S is brought into contact with the transport belt 14 again, corresponding to the time when the rear end of the transfer material S is placed on the transport belt 14.

In addition, such a separation roller 18B separation time,
The trailing end of the fed transfer material S may be removed from the registration roller 18B. In this case, a part of the transfer material S surely reaches the transfer position with the photoconductor 10A, and the transfer material S A state in which electrostatic adsorption is firmly obtained is obtained.

Since the present embodiment has the above-described structure, at the start of copying, the document table 10C1 returns to the exposure start position, and at this return, the transfer material S is fed out.

That is, when the original placing table 10C1 moves back to the left in FIG. 1, the conveying belt 14C in FIG.
Moves to the right. At this point, the transfer material S is fed from the feeding cassette 18A2 in the feeding section 18A to the transport belt 14 via the feeding roller 18A3 and the feeding roller 18A4.

On the other hand, since one of the registration rollers 18B abuts the other 18B1 on the transfer material mounting surface side of the transport belt 14, the leading end of the transferred transfer material S is moved as shown in FIG. 2 (B). Stop, loosen its tip.

Then, when the original placing table 10B1 moves forward to perform exposure scanning of the original, as shown in FIG.
14 also started going forward, and the registration rollers in contact with this
18B also rotates 18B1 along the direction of movement of the transfer material placement surface. Therefore, the transport belt 14 and the registration roller 18B at this time are synchronized based on the movement of the transport belt 14.

On the other hand, after this state progresses and the rear end of the transfer material S is placed on the conveyor belt 14, as shown in FIG.
One of the registration rollers 18B1 is separated from the transfer material mounting surface side of the conveyor belt.

The one 18B1 of the registration roller 18B is kept separated until the next transfer material S is fed out, and contacts the conveyor belt 14 during a plurality of reciprocating movements of the conveyor belt 14 performed during this period. As a result, the transfer of the residual toner adhered on the conveyor belt 14 is prevented.

In this way, by setting the contact / separation time between the registration roller 18B and the transport belt 14, the transport belt 14 due to the drop of the transfer material S occurring at the time when the rear end of the transfer material S is placed on the transport belt 14 is set. The ripple phenomenon of the registration roller 18B
Are canceled out by becoming a wave-proof member.

(Effects) As described above, according to the present invention, it is possible to prevent the conveyance belt, which conveys the transfer material placed thereon, from vibrating depending on the type of the transfer material, particularly, the thickness of the transfer material. This prevents instability of the transfer distance between the transfer material and the photoconductor at the transfer position, which is particularly likely to occur when a thick transfer material is conveyed, and eliminates the occurrence of transfer failure. can do.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a color copying machine which is an example of an apparatus to which a transfer material conveying device according to an embodiment of the present invention is applied, and FIG. 2 is a diagram for explaining the operation of the transfer material conveying device according to the embodiment of the present invention. FIG. 3 is a model diagram showing a conventional transfer material transporting unit structure. 10 ... Color copier, 10A ... Photoconductor, 10H ... Transfer device, 14 ... Transport belt, 18 ... Transfer material transport device, 18A ...
... Supply unit, 18B ... Registration roller, 18B1 ... Roller that can contact and separate from the conveyor belt, S ... Transfer material.

Claims (1)

(57) [Claims] A transport belt which is close to an image transfer section of the photosensitive member and is movable in a direction for transporting a transfer material to be subjected to image transfer toward the image transfer section; And a feeding device for feeding the transfer material to the transport belt, between a transport path of the transfer material formed by the transport belt and a transfer material feeding side in the transfer material feed device. And a pair of rollers facing each other with the transfer belt interposed therebetween, and the transfer belt on the transfer material mounting surface side of the transfer belt is provided so as to be able to approach and separate from the same belt. A registration roller having a roller that rotates following the belt when contacted with the belt, wherein the registration roller is at least a transfer material fed out from the feeding device. The transfer material transport device, characterized in that it is moved away from the conveyor belt after being placed on the conveyor belt.