JPS6236944B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a registration device for transfer paper used in copying machines, printing machines, etc.

Conventionally, the registration method between the transfer paper and the image position on the plate cylinder or photoconductor involves keeping the transfer paper device at a certain position and adjusting the timing with the top of the plate cylinder or the top of the image position on the photoconductor. The mainstream method used to be to remove the paper and restart the paper, but this method required a mechanism for inserting and removing the registration finger, which is a device for connecting and disconnecting power to the registration roll, making it complicated and expensive. It had the disadvantage that registration errors were likely to occur.

There is also a method in which a roll with a registration finger is rotated in synchronization with the optics, but this only has a small registration area, and skew, etc., cannot be completely corrected within this area. That could have happened.

The present invention has been made in view of the above circumstances, and its purpose is to eliminate the drawbacks of the prior art as described above, and to provide a registration device that is inexpensive and applicable to high-speed machines. be.

Hereinafter, the present invention will be explained with reference to the drawings. In the drawing, reference numerals 1 and 2 are pulleys rotatably provided on the device frame (not shown);
There is Endless Belt 3 hanging on it. The pulleys 1 and 2 are provided with sprockets 4 and 5, and the sprockets 4 and 5 mesh with a toothed portion 6 formed on the back surface of the endless belt 3. By rotationally driving one of the pulleys 1, the endless belt The belt 3 can be rotated in the direction of the arrow. A plurality of registration fingers 7 are attached to the surface of the endless belt 3 at regular intervals in the width direction.

In the drawing, reference numeral 8 indicates a paper feed roll of the paper feeding device B, and reference numeral 9 indicates a pressure conveyance roll as the conveyance member A. A shaft 10 of the pressure conveying roll 9 is connected to a shaft 12 of the pulley 2 via a gear mechanism 11.

By means of this gear mechanism 11, the endless belt 3 is operated at a speed S in complete synchronization with, for example, optics together with the pressure conveying roll 9.

Therefore, the paper feed roll 8 has a circumferential speed of V
The paper C, which is a transfer paper, is sped up at a speed V at an appropriate timing. Speed S is speed V
It is set slightly smaller. Therefore, the paper C catches up with the registration finger 7 at a certain point, and registration can be easily performed by adjusting the length of the endless belt 3 so that the registration takes time in a long registration area. The image is reliably fed to the pressure conveyance roll 9 to the transfer point of the image.

If there is no space to place the compression conveyance roll 9 of the paper C (there is a possibility that the space will run out if the drum 14 is moved closer), the position of the roll 9 may be moved backward.

What is shown in FIG. 3 is another embodiment of the present invention, in which a vacuum transport 13 is used as the conveying member A. In the case of this vacuum transfer 13, for example, when the registration finger 7 approaches the transfer point (because we want to make the registration area as long as possible), the mechanism that turns on the function of the vacuum transfer 13 turns on. is necessary.

This is because in order to fully demonstrate the registration function, the paper must be placed on the endless belt 3.
This is because it is desired to be in a state where it can easily slip.

As described in detail above, the registration device according to the present invention includes at least two pulleys 1,
2. An endless belt 3 that is wound and rotatable between them, a registration finger 7 that is provided on the endless belt 3 and makes the transfer sheet follow the endless belt 3, and a transfer finger 7 that is provided on the input side of the endless belt 3. A paper feeding device B that feeds paper in the same direction as the moving direction of the endless belt 3, and a conveyance member A that conveys the transfer paper in synchronization with the endless belt 3.
and is characterized in that the feeding speed V of the paper feeding device B is made faster than the speed S of the endless belt 3, and registration is made possible on the endless belt 3 up to the conveying member A. It is.

Therefore, since the transfer paper is sent out by the paper feeding device B at a speed V that is higher than the speed S of the endless belt 3, the transfer paper catches up with the registration finger 7 at a certain point and takes a long time in the long registration area. It is now possible to perform the registration by applying a certain amount of time, so that there is no deviation in the registration at all, and for this purpose, the transfer paper is restarted at the timing with the leading edge of the image position on the photoreceptor. Since this is not necessary and a relatively long registration area can be set, even transfer paper that has been fed with severe skew can be fed normally.

Furthermore, since the transfer paper is sent out in the same direction as the moving direction of the endless belt 3, the registration finger 7 and the leading edge of the transfer paper move in the same direction, and the transfer paper is fed out on the endless belt 3 to the conveyance member A. Coupled with the fact that registration is possible across the belt, accurate registration is possible even if the speed difference between the delivery speed V and the speed S of the endless belt 3 is set roughly.

Further, although there is a disadvantage that it requires a space corresponding to the conveyance distance of the endless belt 3, as far as registration is concerned, there are no elements that need to be specially controlled, so the structure is simple and it can be manufactured at low cost.

[Brief explanation of the drawing]

Figure 1 is a perspective view of one embodiment of the present invention, Figure 2,
, is an explanatory diagram of its operation, and FIG. 3 is an explanatory diagram of the configuration of another embodiment of the present invention. 1 and 2 are pulleys, 3 is an endless belt, 7 is a registration finger, A is a conveyance member, B
is the paper feed device.

Claims (1)

[Claims] 1 Carrying in an endless belt 3 that is wound between at least two pulleys 1 and 2 and is rotatable, a registration finger 7 that is provided on the endless belt 3 and makes the transfer paper follow the endless belt 3, and the endless belt 3. The paper feeding device includes a paper feeding device B that is provided on the side and feeds the transfer paper in the same direction as the moving direction of the endless belt 3, and a conveyance member A that transports the transfer paper in synchronization with the endless belt 3. A registration device characterized in that the delivery speed V of B is made faster than the speed S of the endless belt 3, and registration can be performed on the endless belt 3 up to the conveying member A.