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Image forming apparatus that smoothly conveys transfer medium while suppressing pre-transfer

A transfer medium and equipment technology, applied in the field of tandem image forming equipment, can solve problems such as hindering the smooth transmission of paper, difficult operation of thick paper transmission, and affecting image quality

Inactive Publication Date: 2006-09-13
BROTHER KOGYO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the entire paper delivery path becomes wavy, preventing smooth paper delivery and potentially affecting image quality
Especially difficult for thick paper transfer operations

Method used

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  • Image forming apparatus that smoothly conveys transfer medium while suppressing pre-transfer
  • Image forming apparatus that smoothly conveys transfer medium while suppressing pre-transfer
  • Image forming apparatus that smoothly conveys transfer medium while suppressing pre-transfer

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0019] Regarding the image forming apparatus of the first embodiment of the present invention, reference will be made to Figure 1B and 2 is described.

[0020] In the following description, the expressions "front", "rear", "upper" and "lower" are used to define various parts when the image forming apparatus is arranged in an orientation intended to be used.

[0021] 1. The overall structure of the printer

[0022] figure 2 is a vertical sectional view showing the overall structure of the printer 1 according to the first embodiment.

[0023] Such as figure 2 As shown in , the printer 1 is a horizontal tandem color laser printer having four horizontally juxtaposed image forming units 20 described later. The printer 1 includes a main casing 5 and, in the main casing 5, a paper supply unit 9 that supplies recording paper 3 into the main casing 5, an image forming unit 4 that forms an image on the recording paper 3 supplied from the paper supply unit 9, A discharge unit 6 ...

no. 2 example

[0063] image 3 is a vertical sectional view of the printer 101 according to the second embodiment. The printer 101 according to the second embodiment differs from the printer 1 regarding the first embodiment in the offset amount between the photosensitive drum 16 and the transfer roller 27 . Since the rest of the structure of the printer 101 is the same as that of the printer 1 in the first embodiment, similar parts and components are assigned the same reference numerals to avoid duplication of description.

[0064] Such as image 3 As shown in , no horizontal offset is provided between the photosensitive drums 16Y, 16M, and 16C and the respective transfer rollers 27Y, 27M, and 27C, that is, except for the photosensitive drum 16K and the transfer roller 27K that are arranged most downstream. The axes 16a and 27a of all the photosensitive drums 16 and the transfer roller 27 are vertically aligned. Therefore, in the present embodiment, each group of the photosensitive drum 1...

no. 3 example

[0069] Figure 4 is a vertical sectional view of the printer 201 according to the third embodiment. The printer 201 according to the third embodiment is different from the printer 1 according to the first embodiment in the structure of increasing the contact distance. Since the rest of the structure of the printer 201 is the same as that of the printer 1 in the first embodiment, similar parts and components are assigned the same reference numerals to avoid duplication of description.

[0070] Such as Figure 4As shown, the photosensitive drums 16 are all arranged in the horizontal direction (front-rear direction). The printer 201 also includes a lift roller (moving member) 40 arranged on the lower upstream side of the photosensitive drum 16K. The lift roller 40 lifts (pulls up) the portion 15b of the transfer belt 15 just upstream of the photosensitive drum 16K to a height above where the photosensitive drums 16Y, 16M, and 16C face the respective transfer rollers 27Y, 27M, ...

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PUM

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Abstract

An image forming apparatus includes an apparatus main body and a plurality of sets each including a photosensitive member and a transfer member. The plurality of sets is disposed in a linear arrangement in the apparatus main body. The photosensitive member and the transfer member of each set sequentially interpose a transfer medium therebetween, thereby sequentially transferring a developer image borne on each photosensitive member onto the transfer medium. A contact distance is defined for each set. The contact distance is a distance from a contact start position at which the photosensitive member starts contacting the transfer medium to a contact end position at which the photosensitive member separates from the transfer medium. The contact distance is greatest for the set farthest downstream in a conveying direction for conveying the transfer medium.

Description

[0001] Cross-references to related applications [0002] This application claims priority from Japanese Patent Application No. 2005-069722 filed on March 11, 2005. The entire content of this priority application is incorporated herein by reference. technical field [0003] The present invention relates to an image forming apparatus, and more particularly, to a tandem image forming apparatus. Background technique [0004] One type of image forming apparatus using electrophotography known in the art is a tandem image forming apparatus. This type of image forming apparatus includes a developing roller, a photosensitive member, and a transfer roller for each color such as yellow, magenta, cyan, and black. During image formation, each developing roller supplies developer in each respective color onto each respective photosensitive member to form developer images in respective colors. Each ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G15/16G03G15/00
CPCG03G15/0189G03G2215/0141G03G2215/00599G03G15/6564G03G15/0194G03G15/6558G03G15/0178
Inventor 横井胜行
Owner BROTHER KOGYO KK