JPH1020589A - Electrophotographic printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the generation of a futiely discarded paper region by providing a rewinding means for rewinding consecutive recording mediums by a specific amount, in the front stage of an image printing unit of the head of plural image printing units. SOLUTION: In the front stage of the image printing unit A of the head of the pleral image printing units A, B and C, a rewinding device 9 for rewinding the recording mediums 10 by the specific amount, at the time of completing printing is provided. Further, in the rear stage of the final stage image printing unit C, out of the image printing units A, B and C, a fixing device 7 for fixing a toner image transferred onto the recording medium 10 thereon is provided. By such a constitution, at the time of completing the printing, the recording medium 10 supporting the toner image is carried up to a position where the recording medium 10 passes through the fixing device 7 and then, stopped. After stopping, the final page for the printing is rewound up to the image printing unit A of the heat by the rewinding device 9. Therefore, the futilely discarded paper region does not exist between the final page for the printing and the first page for the next printing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophotographic printing apparatus for forming a toner image on a long continuous recording medium.

[0002]

2. Description of the Related Art As one form of an electrophotographic printing apparatus, a photoreceptor, a charger for uniformly charging the surface of the photoreceptor, and an electrostatic latent image are formed on the photoreceptor by exposing the charged photoreceptor. An exposure device, a developing device that supplies toner to the electrostatic latent image to form a toner image on a photoconductor, a transfer device that transfers the toner image to a recording medium, and unnecessary toner attached to the photoconductor surface A plurality of printing units comprising a cleaning device for removing the recording medium are arranged in parallel along the recording medium transport direction, and of the plurality of printing units, after the last printing unit, the printing units are transferred onto the recording medium. Electrophotographic printing in which a fixing device for fixing a toner image to a recording medium is provided, and a toner image is formed on a long continuous recording medium conveyed between a transfer unit and a photoreceptor of each of the printing units. Devices are known.

[0003]

In an electrophotographic printing apparatus using a long continuous recording medium of this kind, when printing is completed, the recording medium is conveyed to the vicinity of a final printing unit, and all of the recording medium is conveyed. After transferring the toner image to the recording medium, the conveyance of the recording medium is stopped.

Therefore, there is a disadvantage that the recording medium sent out and stopped between the first printing unit and the last printing unit is completely wasted.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electrophotographic printing apparatus which solves the drawbacks of the prior art and prevents the generation of wasteful paper areas.

[0006]

An object of the present invention is to provide a photoreceptor, a charger for uniformly charging the surface of the photoreceptor, and an exposure for exposing the charged photoreceptor to form an electrostatic latent image on the photoreceptor. A developing device that supplies toner to the electrostatic latent image to form a toner image on a photoconductor, a transfer device that transfers the toner image to a recording medium, and unnecessary toner adhered to the photoconductor surface. A plurality of printing units each including a cleaning device to be removed are arranged in parallel along the recording medium transport direction, and of the plurality of printing units, the toner transferred onto the recording medium is provided after the last printing unit. An electrophotographic printing apparatus for providing a fixing device for fixing an image on a recording medium and forming a toner image on a long continuous recording medium conveyed between a transfer unit and a photoreceptor of each of the printing units, Top imprint of multiple imprinting units In front of the knitting is accomplished by having a rewinding means rewinds the predetermined amount the continuous recording medium.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the electrophotographic printing apparatus of the present invention comprises a photosensitive member 1a, a charger 2a for uniformly charging the surface of the photosensitive member 1a, and a photosensitive member 1a by exposing the charged photosensitive member to light. An exposure device 3a for forming an electrostatic latent image on the photoconductor 1a, a developing device 4a for supplying toner to the electrostatic latent image to form a toner image on the photoreceptor 1a, and a transfer for transferring the toner image to a recording medium 10. A printing unit A comprising a cleaning device 6a for removing unnecessary substances such as residual toner adhered to the surface of the photoreceptor 1a, a photoreceptor 1b, a charger 2b for uniformly charging the surface of the photoreceptor 1b; An exposure device 3b for exposing the exposed photoconductor to form an electrostatic latent image on the photoconductor 1b; a developing device 4b for supplying toner to the electrostatic latent image to form a toner image on the photoconductor 1b; Transfer device 5b for transferring toner image to recording medium 10 A printing unit B including a cleaning device 6b for removing unnecessary substances such as residual toner attached to the surface of the photoconductor 1b, a photoconductor 1c, a charger 2c for uniformly charging the surface of the photoconductor 1c, and a charged photoconductor 1c An exposure device 3c that forms an electrostatic latent image on the photoconductor 1c by exposing the toner, a developing device 4c that supplies toner to the electrostatic latent image to form a toner image on the photoconductor 1c, A plurality of printing units C including a transfer device 5c for transferring the image onto the recording medium 10 and a cleaning device 6c for removing unnecessary substances such as residual toner adhered to the surface of the photoconductor 1c are arranged in parallel along the transport direction of the recording medium 10. ing.

A fixing device 7 for fixing the toner image transferred onto the recording medium 10 to the recording medium 10 is provided downstream of the last printing unit C among the plurality of printing units A, B, and C.
Is provided.

As the recording medium 10, for example, paper having a fold such as a perforation, or continuous paper having a known form such as roll paper is used.

During normal printing, the recording medium 10 is conveyed in the sheet conveying direction shown in FIG. 1 by the sheet conveying device 8, and the transfer units 5a, 5b, 5c of each printing unit and the photosensitive member 1 are transferred.
a, 1b, and 1c.

[0012] Of the plurality of printing units A, B, and C, the recording medium 1 at the end of printing is located before the leading printing unit A.
A rewinding device 9 for rewinding 0 by a predetermined amount is provided.

In the above configuration, when printing is completed, the recording medium 10 supporting the toner image is transported to a position where it passes through the fixing device 7 and then stopped.

In the present invention, as shown in FIG. 2, after stopping, the last page of printing is rewound by the rewinding device 9 to the first printing unit A.

Accordingly, there is no wasteful paper area between the last page of printing and the first page of next printing.

[0016]

As described above, according to the present invention, of a plurality of printing units, a stage preceding a leading printing unit includes:
Since the rewinding means for rewinding the continuous recording medium by a predetermined amount is provided, it is possible to prevent a paper area from being wasted and discarded.

[Brief description of the drawings]

FIG. 1 is a schematic view of an electrophotographic printing apparatus according to the present invention;
FIG. 4 is an explanatory diagram illustrating a state during printing.

FIG. 2 is a schematic view of an electrophotographic printing apparatus according to the present invention;
It is an explanatory view showing a state at the time of operation of a rewinding device.

[Explanation of symbols]

1a, 1b, 1c: Photoconductor, 2a, 2b, 2c: Charger, 3a, 3b, 3c: Exposure device, 4a, 4b, 4c ...
Developing device, 5a, 5b, 5c ... Transfer device, 6a, 6b, 6
c: cleaning device, 7: fixing device, 8: paper transport device, 9:
Rewinding device, 10 ... recording medium.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoji Hirose 1060 Takeda, Hitachinaka-shi, Ibaraki Prefecture Within Hitachi Koki Co., Ltd.

Claims (3)

[Claims] A photoreceptor, a charger for uniformly charging the photoreceptor surface, an exposure device for exposing the charged photoreceptor to form an electrostatic latent image on the photoreceptor, A developing device that supplies toner to form a toner image on a photoconductor, a transfer device that transfers the toner image to a recording medium, and a printing unit that includes a cleaning device that removes unnecessary toner and the like attached to the surface of the photoconductor A fixing device for fixing the toner image transferred on the recording medium to the recording medium at a stage subsequent to the last one of the plurality of printing units. An electrophotographic printing apparatus that forms a toner image on a long continuous recording medium conveyed between a transfer unit and a photoreceptor of each of the printing units, wherein: Before the printing unit, Electrophotographic printing apparatus characterized by having a rewinding means rewinds predetermined amount medium. 2. The electrophotographic printing according to claim 1, wherein the amount of rewinding by the rewinding means is set to be equal to or greater than the distance from the first printing unit to the last printing unit. apparatus. 3. An electrophotographic printing apparatus according to claim 1, wherein a rewind operation by said rewind means is executed at the end of printing.