KR100261090B1 - Imaging method for electrographic imaging system - Google Patents

Abstract

PURPOSE: A method for forming a video of an electronic photography mode printer is provided to form a video in a gap area between unit areas by continuously moving a printing start line of a unit area. CONSTITUTION: The size of paper provided is set(S300). The photosensitive surface except a joint unit of a photosensitive belt is divided into a plurality of unit areas according to the size(S310). A printing is performed by the unit area divided while the photosensitive belt is rotated once(S320). It is judged whether the printing is completed(S330). In case that the printing isn't completed, the unit area formed in the photosensitive belt is shifted from a printing start line(S340).

Description

Imaging method for electrographic imaging system

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming method of an electrophotographic printing press, and more particularly, to an image forming method of an electrophotographic printing press that can use the surface of a photosensitive belt on which an electrostatic latent image is formed, without being limited to a specific region.

The wet electrophotographic image forming apparatus includes imaging means to which a developer for applying a latent image is applied and conveyed. The imaging means comprises a dielectric or a photoconductor, the photoconductor comprising a photoconductive material, wherein a latent image is formed by discharging the photoconductor by a selective light irradiation pattern. As such a photosensitive member, a photosensitive belt, a photosensitive drum and a photosensitive sheet may be used.

1 shows a configuration of an electrophotographic image forming apparatus. Referring to the drawings, the photosensitive belt 100, which is a photoconductive member, is wound around the rollers 101, 102, and 103 to rotate. The rotating photosensitive belt 100 is removed from the charge remaining on the surface by the antistatic portion 104. The photosensitive belt 100 whose surface is cleaned is charged with a uniform charge over the entire surface while passing through the charging unit 105. Subsequently, the electrostatic latent image is formed by partially removing the charge on the surface according to the image to be printed while passing through the exposure portions 107, 108, 109, 110 including a laser scanning unit (not shown) for scanning the laser beam. The photosensitive belt 100 in which the latent electrostatic image is formed is developed by a developer while passing through the developing parts 111, 112, 113, and 114. In the case of a color image forming apparatus, the developer includes a developer such as yellow, magenta, cyan, and black. Each of the developing parts includes a developing roller 111a for applying a developer to the photosensitive belt, and first and second squeegee rollers 111b and 111c for removing excess of the developer.

The photosensitive belt 100 having the electrostatic latent image is dried while passing through the drying roller 115, and transfers the image to the transfer roller 116. The image transferred to the transfer roller 116 is transferred to the feed sheet 200 to complete printing.

Referring to FIG. 2, in which the photosensitive belt 100 is developed, the photosensitive belt 100 is manufactured by connecting both ends of a strip-shaped belt. Therefore, both ends are provided with joints 100a and 100b, and these joints 100a (100b) cause the image to break during printing or deteriorate its quality. In a general electrophotographic image forming apparatus, printing is not performed at the joint portions 100a (100b). That is, when the photosensitive belt 100 is wound around the rollers 101, 102, 103 (see FIG. 1) and circulates in the direction of the arrow, the joint 100a (100b) is sensed by the joint detecting sensor 120. This is mainly performed by the joint detecting sensor 120 detecting the sensing unit 150 displayed on a predetermined portion. The detected signal is sent to the control unit 123 via the analog-to-digital converter 121, and the control unit 123 is connected to the joint portion 100a (100b) of the photosensitive belt 100 according to the signal. Immediately after passing 107, the exposure unit 107 is driven to form an electrostatic latent image on the photosensitive belt 100.

Accordingly, the photosensitive surface of the photosensitive belt 100 has a plurality of unit areas (m ₁ , m ₂ ,..., In which an electrostatic latent image is formed for the area except the joint part 100a according to the size of the paper supplied. m _n ). The unit areas m ₁ , m ₂ , .., m _n are used repeatedly according to the number of prints to be printed in the print job. That is, only one first unit area m ₁ is repeatedly used when a single print job is performed, and the first and second unit areas m ₁ and m ₂ continue to be used when printing two sheets of paper. do. Therefore, since only a specific unit area is used depending on the number of prints, the entire surface of the photosensitive belt may not be evenly used, and the life of the photosensitive belt may be shortened due to damage of a specific portion.

In view of this point, a method of intentional use of the entire surface of the photosensitive belt has been proposed by sequentially forming an electrostatic latent image for the unit regions m ₁ , m ₂ , .., m _n . the unit area _{(m 1, m 2, ..} , m n) areas corresponding to the gap between the well be limited to the use of their own unit area _{(G 1, .., G n} -1,, G n) is Still not available.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides an image forming method of an electrophotographic printer in which an image can be formed even in a gap area between each unit area by continuously moving a printing start line of a unit area. It is.

1 is a schematic diagram showing the configuration of an electrophotographic image forming apparatus according to the present invention;

FIG. 2 is a diagram illustrating division of a unit area for the photosensitive belt shown in FIG. 1;

3 is a flowchart illustrating an electrophotographic image forming method according to the present invention.

<Description of the symbols for the main parts of the drawings>

100 ... Photosensitive belt 101,102,103 ... Roller

104 ... Imperial 105

107,108,109,110 ... Exposure 111,112,113,114 ...

111a ... developing roller 111b, 111c ... squeegee roller

115 ... Drying Roller 116 ... Transfer Roller

120 ... Seam detection means (m ₁ , m ₂ , .., m _n ) ... Unit area

(G ₁ ,., G _n-1 ,, G _n ) ... gap between unit areas

(S ₁ , S ₂ , .., S _n ) ... print start line

In order to achieve the above object, an image forming method of an electrophotographic printer according to the present invention comprises the steps of: dividing a photosensitive surface excluding a joint of a photosensitive belt into a plurality of unit areas according to a size of a feed sheet; And shifting the unit area by ΔL from a printing start line during every printing operation, and satisfies ΔL <G _n . Here, G _n is a gap between the last unit region and the end joint of the photosensitive belt.

In addition, the method includes the steps of: (a) setting the size of the paper to be fed; (b) dividing the photosensitive surface of the photosensitive belt into a plurality of unit areas according to the size of the supplied paper; (c) printing by the partitioned unit area while the photosensitive belt is rotated once; (d) determining whether to end printing after the photosensitive belt rotates once, and if so, terminating printing; And (e) if printing is not finished in step (d), shifting the unit area from the print start line by ΔL and returning to step (c).

Here, ΔL _{n + 1} for ΔL _n and n + 1-th print job for the n-th print job has a value different from each other, and preferably increases or decreases each time every print job.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. 3 is a flowchart illustrating an image forming method of an electrophotographic printing press according to the present invention.

1 to 3 together, first, in step S300, power is applied to the printer, and the size of the supplied paper is set, information about this is transmitted to a memory (not shown) of the controller 123. Subsequently, when the photosensitive belt 100 is circulated, the sensing unit 150 is sensed by the sensing unit 120, and the controller 123 is applied to the surface of the photosensitive belt 100 in consideration of the size of the paper. The print start lines S ₁ , S ₂ , .., S _n and the corresponding unit areas m ₁ , m ₂ , .., m _n are partitioned (step S310). Each of the unit areas m ₁ , m ₂ , .., m _n is partitioned to correspond to the size of the paper to be supplied, for example, A4 or B5. Also,

m ₁ + m ₂ + ... + m _n <L

To satisfy. Here, L represents the photosensitive surface length of the photosensitive belt.

In step S320, an electrostatic latent image is formed for each of the divided unit regions m ₁ , m ₂ , .., m _n . That is, as soon as the print start lines S ₁ , S ₂ ,., S _{n of} each unit area m ₁ , m ₂ , .., m _n pass through the exposure unit 107, laser scanning embedded therein. A laser is irradiated onto the surface of the photosensitive belt 100 by a unit (not shown). Therefore, the surface of the photosensitive belt 100 is charged to correspond to the image to be printed. The charged photosensitive belt 100 is developed while passing through the developing unit 111, and in the case of a color printer, the same process is repeated by the exposure units 108, 109, 110 and the developing units 112, 113, 114.

In step S330, after the photosensitive belt 100 is rotated once, that is, the unit areas m ₁ , m ₂ , .., m _n are all used once, it is determined whether the printing is to be finished. In this case, one rotation of the photosensitive belt 100 may be confirmed by re-sensing by the sensing unit 120 of the sensing unit 150 provided on the surface thereof. In step S330, if the print end command is confirmed, the operation of the printer is terminated, and if the printing is not completed yet, the unit areas (m ₁ , m ₂ , .., m _n ) formed in the photosensitive belt 100 Is shifted from the print start lines S ₁ , S ₂ ,... S _n by ΔL, as indicated by the dotted line in FIG. 2 (step S340). At this time, ΔL is smaller than the gap between the last unit region m _n and the joint 100b, that is, the last gap Gn. That is, ΔL <Gn is satisfied.

As described above, the photosensitive surface length L of the photosensitive belt 100 is

L = (m ₁ + m ₂ , ..., + m _n ) + (G ₁ + G ₂ , ..., + Gn)

This holds true.

After moving by ΔL to form the unit areas m ₁ , m ₂ ,..., And m _n , the sequence returns to step S320 again to perform printing, and it is determined whether to end printing in step S330. If printing is not finished, in step S340 again, the unit areas m ₁ , m ₂ , .., m _n are shifted by ΔL from the print start lines S ₁ , S ₂ , .., S _n . Is formed.

At this time, the unit area shift amount [Delta] L _n at the n print job is set to be different from the shift amount [Delta] L _{n + 1} at the n + 1th print job. Preferably, it is preferable that the value of ΔL gradually increases or decreases as the printing operation is repeated.

As the value of ΔL changes, not only the unit unit areas m ₁ , m ₂ , .., m _{n of} the photosensitive belt 100, but also the gaps G ₁ , G ₂ , .., Gn therebetween. An image is also formed for.

According to the electrophotographic image forming method of the present invention, an image can also be formed in the gap region between each unit region by gradually shifting the unit region partitioned on the photosensitive belt during the printing operation. That is, since the image is uniformly formed over the entire photosensitive surface of the photosensitive belt, not only the life of the photosensitive belt can be extended, but also the printing efficiency can be improved.

Claims (4)

(a) setting the size of the paper to be fed; (b) dividing the photosensitive surface into a plurality of unit areas according to the size of the feed sheet except for the joint of the photosensitive belt; (c) printing by the partitioned unit area while the photosensitive belt is rotated once; (d) determining whether to end printing after the photosensitive belt rotates once, and if so, terminating printing; (e) shifting the unit area by ΔL from the printing start line and returning to step (c) if printing is not finished in the above step, wherein ΔL <G _n is satisfied. Image forming method of electrophotographic printing press. However, G _n is a gap between the last unit area and the end joint of the photosensitive belt. According to claim 1, ΔL _n and n + 1-th ΔL _{n + 1} is the chemical conversion method for forming electrophotographic printing machine, characterized in that with a mutually different value for the print job for the n-th print job. The image forming method of an electrophotographic printer according to claim 2, wherein the ΔL gradually increases or decreases with every printing operation. The image forming method of an electrophotographic printer according to claim 1, wherein the seam is identified by a seam detecting means detecting a sensing unit displayed on the surface of the photosensitive belt.

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