JPH02201379A - Electrophotographic printing device - Google Patents

Abstract

PURPOSE:To eliminate the need to detach a continuous form from the device by providing sets of transfer chargers which transfer a toner image formed on a photosensitive drum to the printing form and fixation parts which fix the toner image transferred to the printing form on the printing form for the continuous paper and cutform paper individually. CONSTITUTION:The sets of the transfer chargers 5 and 10 which transfer the toner image formed on the photosensitive drum 1 to the printing form and the fixing devices 6 and 11 which fix the toner image transferred to the printing form on the printing form are provided for the continuous form 13 and cutform paper 14 individually. Namely, when the cutform paper is used for printing, the toner image transferred to the cutform paper 14 is fixed on the cutform paper 14 by the fixing device 6. Then the cutform paper 14 is discharged to a cutform stacker 8 by a conveyor roller 7. During this period, none of a form tractor, the transfer charger 10, the fixing device 11, and the conveyor roller 12 operates and the continuous paper 13 is still set on the device. Consequently, the continuous paper 13 need not be detached from the device.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electrophotographic printing device, and particularly to an electrophotographic printing device that can use continuous paper and cut paper.

[Conventional technology]

Conventionally, this type of electrophotographic printing apparatus has had a configuration as shown in FIG. In FIG. 2, 21 is a photosensitive drum, 22 is a paper feed roller, 23 is a paper cassette, 24 is a cut sheet, 25 is a paper tractor, 26 is a continuous paper, 27 is a transport roller, 28 is a transfer charger, and 29 is a fixing device. vessel, 30
is a conveyance roller, and 31 is a paper cassette.

[Problem to be solved by the invention]

The conventional electrophotographic printing apparatus described above has a photosensitive drum 2I.
A transfer charger 28 for transferring the toner image formed on the printing paper and a fixing device 29 for fixing the toner image transferred to the printing paper onto the printing paper are connected to the continuous paper 2.
6 and cut paper 24, so when printing on cut paper 24 after printing on continuous paper 26,
When the continuous paper 26 is set in the device, since the continuous paper 26 is present in the transfer charger 28, the cut paper 2
Furthermore, the toner image cannot be transferred normally to the continuous paper 26, and the cut paper 24 runs over the unfixed toner image on the continuous paper 26.

There are problems such as the unfixed 1-toner image on the continuous paper 26 being disturbed, or because the continuous paper 26 is stopped, the continuous paper 26 may be burned by the heat generated from the fixing device 29. - Printing on the cut sheet 24 must be performed after the continuous sheet 26 is removed from the device.

There is a drawback that in order to print on the continuous paper 26 again, the continuous paper 26 must be set in the apparatus again.

An object of the present invention is to provide an electrophotographic printing apparatus that solves the above problems.

[Means to solve the problem]

In order to achieve the above object, two electrophotographic printing apparatuses according to the present invention include a transfer charger that transfers a toner image formed on a photosensitive drum onto a printing paper, and a transfer charger that transfers a toner image formed on a photosensitive drum onto a printing paper. This system has separate sets of fixing devices for continuous paper and cut paper, respectively.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention.

In FIG. 1, 1 is a photosensitive drum, 2 is a paper feed roller, and 3 is a photosensitive drum.
is a paper cassette, 4 is a transport roller, 5 is a transfer charger, 6 is a fixing device, 7 is a transport roller, 8 is a paper stacker, 9
1 is a paper tractor, 10 is a transfer charger, 11 is a fixing device, 12 is a conveying roller, 13 is continuous paper, and 14 is cut paper. Although not shown in the drawing, a mechanism necessary for electrophotographic printing is arranged around the photosensitive drum 1.

Next, the operation will be explained.

When printing on the continuous paper 13, the photosensitive drum 1 first starts rotating, and the mechanism for electrophotographic printing arranged around the photosensitive drum 1 starts operating. Form a toner image.

When the photosensitive drum 1 further rotates and the toner image formed on the photosensitive drum 1 reaches the position of the transfer charger 10, the paper tractor 9 and the conveyance roller 12 rotate simultaneously, and the continuous paper 13 starts running. . At the same time, the transfer charger IO starts operating, and the toner image formed on the photosensitive drum 1 is transferred onto the continuous paper 13.

The toner image transferred to the continuous paper 13 is fixed onto the continuous paper 13 by a fixing device 11. Thereafter, the operations of forming a toner image on the photosensitive drum 1, transferring the toner image to the continuous paper 13, and fixing the toner image transferred to the continuous paper 13 are repeated to perform printing on the continuous paper.

Paper feed roller 2. Conveyance roller 4, transfer charger 5, fixing device 6. The conveyance roller 7 does not operate.

When printing on cut paper, first the photosensitive drum 1 starts rotating, then the paper feed roller 2 rotates, feeds the cut paper 14 in the paper cassette 3 into the device, and then Paper 14
The paper feed roller 2 stops rotating when it reaches the conveyance roller rough. Next, a mechanism for performing electrophotographic printing arranged around the photosensitive drum 1 operates, and a toner image is deposited on the photosensitive drum 1. Form. When the toner image formed on the photosensitive drum 1 reaches the position of the transfer charger 5, the cut sheet 1
When the transfer roller 4 reaches the position of the transfer charger 5, the conveyance roller 4 starts rotating and conveys the cut sheet 14 into the apparatus. When the toner image formed on the photosensitive drum 1 and the cut sheet 14 reach the position of the transfer charger 5, the transfer charger 5 starts operating, and the toner image formed on the photosensitive drum 1 is transferred to the cut sheet 14. transcribed into. The toner image transferred to the cut sheet 14 is fixed onto the cut sheet 14 by the fixing device 6. Thereafter, the cut sheet 14 is discharged to the sheet stacker 8 by the transport roller 7. During this time,
Paper tractor9. Transfer charger 10. Fixing device 11. The conveyance roller 12 does not operate, and the continuous paper 13 remains set in the apparatus.

〔Effect of the invention〕

As explained above, the present invention is a combination of a transfer charger for transferring a toner image formed on a photosensitive drum onto printing paper and a fixing device for fixing the toner image transferred to the printing paper onto the printing paper. By having these separately for continuous paper and cut paper, there is an effect that there is no need to remove the continuous paper from the device when printing on cut paper after printing on continuous paper. be.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional example.

Claims (1)

[Claims] (1) A combination of a transfer charger that transfers the toner image formed on the photosensitive drum onto printing paper and a fixing device that fixes the toner image transferred to the printing paper onto the printing paper is used for continuous paper and cut paper. An electrophotographic printing device characterized in that the electrophotographic printing device is provided separately for each.