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Image forming apparatus

A technology of imaging equipment and extrusion parts, which is applied in thin material processing, printing, printing devices, etc., can solve the problems of weakening the pressing force of the pinch roller device, high conveying speed of the conveying belt, deterioration of image quality, etc., and achieves the conveying speed. Variation suppression, deterioration prevention, and distortion prevention effects

Inactive Publication Date: 2009-02-11
BROTHER KOGYO KK
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Problems solved by technology

Thus, the variation in the conveying speed of the conveying belt becomes large just after the recording medium has been pinched and conveyed, resulting in deterioration of image quality.
[0006] On the other hand, if the pressing force of the pinch roller device is weakened in order to suppress this change in conveying speed, floating of the recording medium occurs as described above, resulting in deterioration of image quality.

Method used

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Embodiment Construction

[0045] Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a schematic diagram of an image forming apparatus 1 according to a first embodiment of the present invention. First, the overall structure of the imaging apparatus 1 will be described with reference to FIG. 1 .

[0046] The image forming apparatus 1 mainly includes: a supply unit 2 that supplies a recording medium 22 (see FIG. 2B ) to the main body 1 a; a conveyance unit 3 that conveys the recording medium 22 supplied by the supply unit 2; , the recording head 4 ejects ink onto the recording medium 22 conveyed by the conveying unit 3 to form an image; and a stacker 5 that stores the recording medium 22 that has been imaged by the recording head 4 .

[0047]The supply unit 2 includes a tray (not shown) accommodating a recording medium 22 , and a pickup roller 21 that contacts the recording medium 22 accommodated in the tray. When the pick...

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Abstract

In an image forming apparatus (1) according to the present invention, a nip roller group (33) for pressing a face of a conveyance belt (31) on which a recording medium (22) is held includes a pair of first end pressing parts (33a, 33c) which are arranged in the width direction of the conveyance belt (31) at a distance corresponding to the recording medium (22) having a predetermined size, and a first center pressing part (33b) which is arranged between the pair of first end pressing parts (33a, 33c). Herein, a pressing force of the first center pressing part (33b) is set to be smaller than pressing forces of the first end pressing parts (33a, 33c).

Description

technical field [0001] The present invention relates to an imaging device. In particular, the present invention relates to an image forming apparatus that suppresses variations in conveying speed of a conveying belt and floating of a recording medium to prevent image quality from deteriorating. Background technique [0002] In an image forming apparatus that forms a desired image on a recording medium held on an endless conveyor belt, the recording medium held on the conveyor belt generally tends to float. Such floating makes it difficult to maintain the recording medium in a horizontal state with respect to the recording head for ink ejection, resulting in deterioration of image quality. [0003] In order to solve this problem, Japanese Laid-Open Patent Application No. 2-86475 (1990) discloses a technique of disposing cylindrical nip rollers (pinch roller means) on the conveying surface of a belt (conveyor belt). According to this technique, the pinch rollers press the re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B41J11/02B41J13/00B65H5/02B41J2/01
CPCB41J13/076B41J11/007
Inventor 中岛笃久
Owner BROTHER KOGYO KK
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