JPH02215644A - Transfer paper carrier - Google Patents

Abstract

PURPOSE:To properly carry decalcomania papers by detecting the rotary displacement of an image forming drum side roller position by means of a sensor to apply angle information selected therefrom and preventing the changing of angle from forgetting. CONSTITUTION:Transfer papers P are put on a belt to be carried to a fixing device 4 by the belt which is extended and rolled between an image forming drum 1 side holding roller 5 and a fixing device 4 side holding roller 6. The drum side holding roller 5 may rotate round the holding roller 5 and also may select a carrying angle and a separating angle for removing a jammed paper according to the size of the transfer paper P. The angle is changed by rotating a lever wheel 9 and rotating and displacing a lever 10 integral therewith. The lever wheel 9 is provided with the sensor 11 of a rotary encoder so that information of the rotary position of the lever 10 can be obtained thereby. Consequently, a carrying angle can be automatically changed due to the reversible rotary control of a motor 8 so that the forgetting of changing of an angle can be eliminated and the transfer papers P can be properly carried.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a transfer paper conveying device, and more specifically, the present invention relates to a transfer paper conveying device, and more specifically, a belt and a roller that receive a transfer paper on which a toner image has been transferred from an image forming drum and send it to a fixing device. The present invention relates to a conveyance device using a conveyance unit having the above-mentioned conveyance unit.

(Prior Art) Most of the above-mentioned conveyance devices convey the transfer paper by fixing the roller axis position on the fuser side and making the roller position on the image forming drum rotatable around the fuser side roller axis. If the image forming drum side roller is moved closer to the image forming drum, the image forming drum side roller is moved closer to the image forming drum. The jammed paper is removed at a detachment angle that is displaced to a position away from the image forming drum, and switching between the conveyance angle and detachment angle by displacing the roller on the image forming drum side is done by opening the front door of a recording device such as a copying machine. This was done manually, and when the switch was switched to the detachment angle, the switching operation member came into contact with the front door, etc., thereby preventing the front door, etc. from being closed.

With this conveyance device, not only is it inconvenient to switch the transfer paper manually, but the conveyance angle is constant regardless of the size of the transfer paper, so it can be transferred from the image forming drum to the fixing device with plenty of time. When conveying large-sized transfer paper, when the leading edge of the transfer paper enters the nip of the fixing device, the impact is propagated on the transfer paper, causing transfer misalignment caused by slippage between the image forming drum and the transfer paper, or There is a problem in that transfer misalignment is likely to occur due to the difference in linear velocity between the image forming drum and the fixing device.

Therefore, as a conveying device to solve this problem, when conveying a large-sized transfer paper like the one mentioned above, the image forming drum side roller should be moved farther from the image forming drum than the conveying angle of a small-sized transfer paper! Therefore, when the leading edge of the transfer paper reaches the fixing device, there is slack in the transfer paper as an impact part, and this slack causes the shock and image when the leading edge of the transfer paper enters the nip of the fixing device. There is also known a conveying device that absorbs the influence of a slight difference in linear velocity between the forming drum and the fixing device to prevent transfer misalignment from occurring. This conveyance device also has to be switched manually, and therefore, with this conveyance device, there is a problem in that it is easy to forget to switch the conveyance angle depending on the size of the transfer paper.

Note that if a small-sized transfer paper that does not pass from the image forming drum to the fixing device is transported at the transport angle used for transporting a large-sized transfer paper as described above, it may sag on the transport device. It becomes easier.

[Problem to be solved by the invention]

The present invention has been made in order to solve the above-mentioned problems with conventional conveying devices, and it is possible to switch the conveying angle depending on the size of the transfer paper or to change the detachment angle for removing jams. Now, it is an object of the present invention to provide a transfer paper conveying device that can prevent forgetting to switch and furthermore, can easily perform automatic switching.

[Means to solve the problem]

The present invention is a conveying unit having a belt and rollers that receive a transfer sheet on which a 1-toner image has been transferred from an image forming drum and send it to a fixing device, and the image forming drum side roller is centered around a roller axis on the fixing device side. A transfer paper conveyance device using a conveyance unit that selects a plurality of conveyance angles by rotationally displacing the position, characterized in that a sensor is used that detects the rotational displacement and provides information on the selected angle. This configuration achieves the above object.

[Effect]

That is, in the transfer paper conveyance device of the present invention that can select a plurality of conveyance angles, the sensor detects the rotational displacement of the image forming drum side roller position around the fuser side roller axis, and selects a plurality of conveyance angles. Since angle information is provided, forgetting to switch can be easily prevented by using that information for switching display and automatic switching.

〔Example〕

The present invention will be explained below using illustrated examples.

FIG. 1 is a side view of essential parts of an electrophotographic recording apparatus showing an example of the transfer paper conveying apparatus of the present invention. In the figure, ■ indicates rotation 12 in the direction of the arrow, a toner image is formed on the surface by an image forming means (not shown), and the toner image is transferred by a transfer device 2 to paper fed by a paper feeding means (not shown). An image forming drum 4 separates the transfer paper r onto which the toner image has been transferred by a separator 3, and 4 is a fixing device that rotates in the direction of the arrow to feed the transfer paper P and fixes the toner image on the transfer paper P. .

The transfer paper P separated from the image forming drum 1 is wrapped around an image forming drum side support roller 5 and a fixing device side support roller 6, and is conveyed to the fixing device 4 by riding on a conveying belt 7 rotating in the direction of the arrow. be done. The image forming drum side support roller 5 of this conveying device is located at a solid line position closest to the image forming drum l, at a dashed line position a little away from the image forming drum l, and at two points farthest from the image forming drum l. It can be switched to the chain line position. In this switching, a forward/reverse rotation motor 8, such as a stepping motor, rotates under the control of a control means (not shown), rotates a lever wheel 9, and rotationally displaces a lever IO integrated with the lever wheel 9. This is done by The control means controls the transfer paper r to be placed between the image forming drum l and the fixing device 4 based on the transfer paper size information and the rotational position information of the lever 10 provided by the sensor 11 of the rotary encoder provided for the lever wheel 9. If the image forming drum side support roller 5 occupies the solid line position, and the transfer paper P is placed between the image forming drum 1 and the fixing device 4 with a large margin, if the image forming drum side support roller 5 is of a size that does not cross the image forming drum 1 or does not have much margin even if it crosses over, In the case of a large size, the forward and reverse rotation of the motor 8 is controlled so that the image forming drum side support a-ra 5 occupies the position indicated by the dashed dot line, and the lever 1 is provided with jam detection information of the transfer paper P and the sensor 11.
Based on the rotational position information of 0, if the transfer paper P is jammed, the forward and reverse rotation of the motor 8 is controlled so that the image forming drum side support roller 5 occupies the position indicated by the two-dot chain line. As a result, switching of the conveying angle and switching to the t-th angle for removing jammed paper are performed automatically, eliminating the need to forget to switch, and ensuring that small-sized transfer paper is fed to the fixing device without tripping over it. Even if there is a slight difference in linear velocity between the image forming drum and the fixing device, it is possible to obtain the effect that transfer misalignment will not occur on a large-sized transfer paper.

Although the above illustrated example is preferable, the present invention is not limited thereto, and even if a sensor is provided for each possible position of the image forming drum side roller, the possible positions of the image forming drum side roller may be the stopper or the like. Switching is performed manually based on the click stop, and sensor information is used to display fαH of the roller on the image forming drum side.1. It's okay to wait.

C Effects of the Invention] In the transfer paper conveyance device of the present invention, it is possible to switch the conveyance angle according to the transfer paper size and the separation angle for removing jammed paper, and there is no need to forget to switch.
Therefore, it is necessary to feed the small-sized transfer paper to the fixing device without causing it to trip, and even if there is a slight linear speed difference between the image forming drum and the fixing device, transfer misalignment will occur on the large-sized transfer paper. This has the excellent effect of ensuring that no damage is caused.

[Brief explanation of the drawing]

FIG. 1 is a side view of a main part of an electrophotographic recording device showing an example of a transfer paper conveying device of the present invention. l... Image forming drum 2... Transfer device 3... Separator 4... Fixing device 5... Image forming drum side support roller 6... Fixing device side support roller 7... Conveyance belt 8... Forward/reverse rotation motor 9...
Lever wheel 10...Lever 11...Sensor

Claims (4)

[Claims] (1) A conveyance unit that has a belt and rollers that receives a transfer paper on which a toner image has been transferred from an image forming drum and sends it to a fixing device, and the roller position on the image forming drum side is rotated around the roller axis on the fixing device side. A transfer paper transport device using a transport unit capable of dynamically displacing and selecting a plurality of transport angles, characterized in that a sensor is used that detects the rotational displacement and provides selected angle information. Conveyance device. (2) The transfer paper conveying device according to claim 1, wherein the rotational displacement is performed based on information of the sensor and paper size information of the transfer paper, and a conveyance angle according to the paper size is selected. . (3) The transfer paper conveying device according to claim 1, wherein the rotational displacement is performed by driving a motor. (4) The transfer paper transport device according to claim 1, wherein at least one of the plurality of transport angles is a separation angle for removing jammed paper.