JPH01147481A - Image forming device - Google Patents

Abstract

PURPOSE:To improve processing speed when image forming processing is successively performed more than two times on one recording sheet by providing one image carrier with at least two pairs of image forming parts. CONSTITUTION:The image carrier 1 is provided with 1st toner image forming parts 20, 25 and 30 forming toner images. The image carrier 1 which has passed a 1st transfer part 35 is provided with 2nd toner image forming parts 50, 55 and 60 forming toner images. A 1st fixing process part 40 performs a fixing process on a recording medium 5 where toner images are transferred by the 1st transfer part 35 and a 2nd fixing process part 70 performs a fixing process on the recording medium 5 where toner images are transferred by the 2nd transfer part 65. The recording medium 5 is conveyed in this order; from the 1st transfer part 35, the 1st fixing process part 40 and the 2nd transfer part 65 to the 2nd fixing process part 70. Thus, the processing speed can be improved when toner images are formed at least more than two times on one recording sheet in the form of cut sheet.

Description

[Detailed Description of the Invention] [Summary] A ψ forming device that forms a toner image on an endless image carrier and transfers this toner image around a cut paper-like recording medium. The purpose of the present invention is to provide an image forming apparatus that can increase the processing speed when forming at least two (b) toner images on a recording medium, and includes an endless image carrier and a toner image formed on the image carrier. a first toner image forming section to form a toner image; a second toner image forming section that forms a toner image on the mass carrier); and a transfer section that transfers the toner image formed by the second toner image forming section onto the recording medium. and a first fixing section for performing a fixing process on the recording medium onto which the toner image has been transferred in the first transfer section.
II processing section; a second fixing section that performs fixing processing on the recording medium onto which the toner image has been transferred by the second transfer section; , a second transfer section, and a conveying means for conveying the image to the second fixing section in this order.

[Industrial application field]

The present invention relates to an image forming apparatus that forms a toner image on an endless image carrier and transfers the toner image to a cut paper-like recording medium.

[Conventional technology]

FIG. 2 is a diagram showing an example of image forming and mounting using cut paper, for example, using an electronic printing method such as a laser printer.

In the figure, a photosensitive drum 11 which is an endless image carrier
The toner image is formed on the process members disposed in a circle by rotating in the eight directions indicated by the arrow L'i.

This process member includes a light source such as an LRD array, a laser, etc., which irradiates light to form a six-electrode latent image according to the information to be recorded, before uniformly charging the entire surface of the photoreceptor drum 1. 3. Developing device that develops the latent image with toner 4. Transfer charger 6 that transfers the toner image onto cut paper-like recording paper 5
．． There is a cleaner 7 for removing residual toner, and a fixing device 8 for fixing the toner onto the recording paper 6.

On the other hand, a large number of recording sheets 5 are stacked in a hopper 9, and after being fed out by a pick roller IO, they are transported by a transport means such as a roller 11 to a transfer section.

The image passes through the fixing device and is stored in the stacker 12.

In addition, when performing double-sided printing on the recording paper 5, after passing through the fixing device 8, it is guided to the transport direction reversing section 13, the transport direction is reversed, and the paper is introduced into the re-transfer section. The opposite side of the recording paper 5 comes into contact with the photosensitive drum 1@.

[Problem that the invention seeks to solve]

However, in the conventional A↑forming apparatus as described above, printing on the next recording paper 5 cannot be performed until after printing has been performed on both sides of the − sheet of recording paper 50, and in the case of single-sided printing, printing cannot be performed on the next recording paper 5. There was a problem in that the processing amount of 4g was reduced by half compared to the previous version.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional problems, an object of the present invention is to provide an image forming apparatus that can improve the processing unit when forming toner images at least twice on a sheet of cut paper-like recording paper. There is a particular thing.

[Means for solving intervening points]

As shown in FIG. 1, this purpose is to provide an endless image carrier 1 and first toner image forming sections 20 and 25 that form toner images on the image carrier 1.

30, a first transfer section 35 that transfers the toner image formed by the first toner image forming section I onto the cut paper-like recording medium 5, and the image that has passed through the first transfer section 35. a second toner image forming section 50, 55, 60 that forms a toner image on the carrier 1; and the second toner image forming section 50.
, 55 and 60 are transferred to the recording medium 5.
a second transfer section 65 that transfers onto the top, and the first transfer section 3
A first fixing processing unit 40 performs a fixing process on the recording medium 5 onto which the toner image has been transferred in step 5, and a first fixing processing unit 40 performs a fixing process on the recording medium 5 onto which the toner image has been transferred in the second transfer unit 65. 2
fixing processing section 70, and the recording medium 5 is transferred to the first transfer section 35. First fixing processing section 40. Second transfer section 65. The second fixing processing section 70 is configured to include a conveying means for transporting drops in order.

[Effect]

That is, in the present invention, at least two sets of toner image forming sections are provided for one image bearing member, and the toner is sequentially supplied to the transfer section corresponding to each image storage section. 4! +
, the processing speed can be improved.

〔Example〕

FIG. 1 is an explanatory diagram of an embodiment of an image forming apparatus according to the present invention. In the figure, the same parts as in Figure 2 are given the same numbers, and the spaces between them are omitted. L'F2D array optical system that irradiates light onto the photoreceptor drum 1 in response to f-information.

It consists of a laser source, etc., and 30 is the first developing device. 35 is a first transfer section that transfers the toner image onto the recording paper 50 and 5a side; 40 is a first fixing section; 45 is a first cleaner section that removes residual toner, and with the above configuration, recording paper is Recording processing is performed on one side 5a of the paper 5. On the other hand, the processing on the other side 5b is carried out by the second front charger 50, which is similar to the one described above. Second exposure section 5
5. Second developing section 60. Second transfer section 65, second fixing device 70. This is done by the action of the second cleaner 75.

Here, the recording paper 5 is conveyed along a guide by rollers (not shown).

It goes without saying that the second transfer section 65 transfers the image onto the cut paper-like recording paper conveyed by the direction transfer section 3.

With the configuration described above, recording can be performed without reducing the processing speed when recording on both sides of -sheets of recording paper.

In other words, even if the recording paper 5 is continuously fed out from the hopper 9, it will not return to the same part for printing on the back side, and the $2
Since the image is recorded in the transfer section, continuous processing is possible.

In addition, in the case of only one side, the reversing part 13. Second transfer section 65
and is stored in the stacker 12. At this time, no transfer is performed at the second transfer section.

Furthermore, the first fixation? A switching lever and another stacker may be provided at the rear stage of 540, and the stacker may be stored there.

Furthermore, in the above embodiment, double-sided printing of the same color was described, but the first image forming side is configured to be printed in black and the second image forming side is printed in red, and the eye reversal portion 13 is Alternatively, two-color recording may be performed by transporting the recording paper 5 from the first fixing device 40 to the second transfer section 65 as shown by arrow B.

〔Effect of the invention〕

As explained above, according to the present invention, since at least two sets of image forming sections are provided for one image carrier,
- The processing speed can be increased when image forming processing is performed on a sheet of recording paper two or more times in succession.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of one embodiment, and FIG. tJX2 is an explanatory diagram of a conventional example. In the figure, 1 is a photosensitive drum, 5 is a recording paper, 25 is a first exposure section, 35 is a first transfer section, 55 is a second dawn section, and 65 is a second transfer section. −・he＼ Agent Patent Attorney Igata Sada゛−゛)、／

Claims (2)

[Claims] (1) An endless image carrier (1), a first toner image forming section (20, 25, 30) that forms a toner image on the image carrier (1), and the first toner image A first transfer unit (35) that transfers the toner image formed by the forming unit (20, 25, 30) onto a cut paper-like recording medium (5);
35), a second toner image forming section (50, 55, 60) forming a toner image on the image carrier (1) that has passed through the second toner image forming section (50, 55, 60); A second step for transferring the toner image formed by the toner image onto the recording medium (5).
a transfer unit (65); and a first fixing unit (40) that performs a fixing process on the recording medium (5) onto which the toner image has been transferred by the first transfer unit (35).
), and a second fixing processing section (70) that performs a fixing processing on the recording medium (5) onto which the toner image has been transferred by the second transfer section (65).
), and the recording medium (5) is transferred to the first transfer section (35) and the first transfer section (35).
An image forming apparatus comprising: a fixing processing section (40), a second transfer section (65), and a conveying means for transporting the image in the order of a second fixing processing section (70). (2) The conveying means transports the recording medium (5) between the first fixing processing section (40) and the second transfer section (65).
The image forming apparatus according to claim 1, further comprising a conveying direction reversing section (13) for reversing the conveying direction of the image forming apparatus.