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Image-forming apparatus

An image and replication device technology, which is applied in the fields of electrical recording technology using charge graphics, equipment using electrical recording technology using charge graphics, and electrical recording technology, can solve the problems of poor adsorption of replication materials, printing disorder, etc., and achieve adjustment. Effect of toner duplication, prevention of decrease in electrostatic adsorption ability, good toner duplication

Inactive Publication Date: 2004-06-23
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is easy to cause poor adsorption of copy materials and printing disorder.

Method used

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Examples

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Embodiment Construction

[0091] Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

[0092] Refer below Figure 1 to Figure 18 , to illustrate the first embodiment of the present invention.

[0093] Such as figure 2 As shown, according to the image forming apparatus according to this embodiment, the image reproduction material P is formed from the storage and supply toner (see Figure 11 ), the transfer unit 2 for transferring the toner image on the transfer material P, the developing unit 3 for forming the toner image, and the welding and fixing of the toner image transferred on the transfer material P The fixing unit 4 is used.

[0094] At the above-mentioned paper supply unit 1, there is provided a detachably arranged at the lowermost part of the main body, storing reproduction materials P (refer to Figure 11 ) and supply the paper feeding cassette 5 of the duplicating material P to the above-mentioned duplicating section 2; and...

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Abstract

An image-forming apparatus is provided with: a photoconductor drum having a surface on which a toner image is formed, a transfer drum for transferring the toner image onto a copying material by allowing the copying material to contact the photoconductor drum, and a ground roller for electrostatically attracting the copying material onto the transfer drum prior to transferring the toner image onto the copying material. The transfer drum is constituted by a semiconductive layer and a dielectric layer that are stacked on a conductive layer. Supposing that the nip width between the photoconductor drum and the transfer drum is L1, the rotation speed of the two drums is Vp, and the time constant, which is represented by a product of the resistance and the capacitance between the two drums, is tau , the relationship represented by L1 / Vp < tau is satisfied. By defining the time constant of the transfer drum as described above, it becomes possible to stabilize an electric field made by the transfer drum, and consequently to carry out a desired transferring operation.

Description

technical field [0001] The present invention relates to image forming apparatuses used in laser printers, copiers, laser facsimiles, composite devices thereof, and the like. Background technique [0002] Conventional image forming apparatus attaches toner to an electrostatic latent image formed on a photosensitive drum, develops it, and prints the toner image on a copy material wound on the drum. [0003] This type of image forming apparatus, such as Figure 27 As shown, in the interior of the cylindrical body 101 having the dielectric layer 101a, corona electrostatic chargers 102 for absorbing the copying material P are arranged respectively, and the toner image formed on the surface of the photosensitive drum 103 is copied on the surface of the photosensitive drum 103. The corona electrostatic charger 104 on the duplication material P, and each of the corona electrostatic chargers 102, 104 is used to respectively perform adsorption and duplication of the duplication materi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G21/14G03G15/01G03G15/16
CPCG03G15/1685G03G15/167G03G2215/1614
Inventor 高谷敏彦岛津史生吉田诚一大西英树及川智博岩仓良惠
Owner SHARP KK