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Image forming apparatus

An image and image carrier technology, which is applied to the electrical recording process using charge graphics, equipment and instruments for the electrical recording process using charge graphics, etc.

Active Publication Date: 2014-03-26
KONICA MINOLTA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, there is a risk that the paper will move in a direction perpendicular to the transport direction in a state where the front end of the paper is bitten by the transfer roller at the image transfer position.

Method used

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Examples

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Embodiment Construction

[0030] Hereinafter, a configuration example and a control example of an image forming apparatus according to an embodiment of the present invention will be described with reference to the drawings. The description in this column is not limited to the scope of technology described in the claims, or the meaning of terms.

[0031] figure 1 The illustrated color copier 100 constitutes an example of an image forming apparatus. The color copier 100 has a function of correcting the offset of the paper P, and forms a color image on the predetermined paper P after offset correction (calibration shake correction). The image forming apparatus according to the present invention is not limited to the color copier 100, but can be applied to monochrome or color printers, and their multifunction machines.

[0032] The color copier 100 has an offset correction mode. Here, the offset correction mode refers to shifting the paper P immediately before image transfer based on the offset amount t...

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Abstract

Provided is an image forming apparatus which can reliably complete the deviation correction before paper after correction reaches an image transfer position, and meanwhile, can reliably clamp paper after deviation correction in a transfer roller even though the paper is in different basic weight.The image forming apparatus contains a registration correction portion (40) correcting an inclination of the sheet of paper by hitting a forward end of the sheet of paper against a pair of registration rollers (32), a detection portion (11) that detects an amount of deviation in the sheet of paper, a control portion (50) that calculates a command value of movement for correcting the amount of deviation and a moving portion (41) that moves the registration rollers (32) toward a direction which is perpendicular to a sheet-conveying direction based on the command value of movement with the sheet of paper being nipped with the registration rollers (32). The control portion (50) controls the moving portion so that the movement of the registration rollers (32) finishes before a limited time of movement or below an upper limit of movement set in relation to the command value of movement.

Description

technical field [0001] The present invention relates to an image forming apparatus suitable for use in monochrome or color printers, copiers, multifunction machines, and the like. Background technique [0002] A recent image forming apparatus includes a moving unit including a positional deviation detecting unit and a pair of alignment rollers. The positional deviation detection unit detects the positional deviation of the paper immediately before the image transfer position, and the moving unit pinches the paper by the alignment roller pair based on the detected amount of the paper and directs the paper in a direction perpendicular to the conveying direction. Move to correct the positional deviation (offset correction) (JP-A-2007-022680). [0003] However, according to the image forming apparatus having an offset correction function found in Patent Document 1, there are the following problems. [0004] i. When the registration roller is moved in a direction perpendicular ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G15/00
CPCG03G15/6567G03G2215/00561G03G15/6558G03G15/6561
Inventor 川中子悠介大久保贵弘野中建
Owner KONICA MINOLTA INC
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