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Image forming device and sheet conveying device

A sheet and image technology, applied in the field of image forming devices, can solve the problems of increasing the interval between sheets and reducing productivity, and achieve the effect of precise sheet interval

Active Publication Date: 2017-02-22
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conversely, if the sheet interval is excessively increased by adjustment, the productivity (the number of sheets capable of forming an image on a sheet per unit time) decreases

Method used

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  • Image forming device and sheet conveying device
  • Image forming device and sheet conveying device
  • Image forming device and sheet conveying device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] image forming device

[0022] figure 1 is a schematic cross-sectional view of the image forming apparatus 100 . Although the image forming apparatus 100 according to the present embodiment is a printer employing an electrophotographic method, an image forming apparatus applicable to the present invention may employ other image forming methods such as an inkjet method or a thermal transfer method. The photosensitive drum 122 serves as a photosensitive element and an image carrier, and rotates in a clockwise direction at a predetermined peripheral speed (process speed) vps. The charging roller 123 uniformly charges the surface of the photosensitive drum 122 . The optical scanning device 140 outputs light beams according to image signals. The light beam is reflected by the mirror 141, irradiates the surface of the photosensitive drum 122, and forms an electrostatic latent image. The developing roller 121 develops the electrostatic latent image by adhering toner thereto...

Embodiment 2

[0068] In Embodiment 1, the method for determining the reduction amount Q is selected by using the difference Δ between the sheet length measurement result Lmsr of the previous sheet and the nominal value specified by the operator. Embodiment 1 is based on the premise that the operator designates the correction size of the sheet S. Therefore, if the operator designates an incorrect size, the reduction amount Q cannot be correctly determined. In view of the above problems, Embodiment 2 describes an example in which the reduction amount is determined according to the range of the measurement error measured in advance. Note that the description of the matters common to Embodiment 2 and Embodiment 1 is omitted.

[0069] refer to Figure 4A to Figure 4F As mentioned above, the gyro sensor 107 has a marker 402, an optical chopper 401, a spring 407, and the like. Therefore, the following factors may cause sheet spacing measurement errors:

[0070] - Tolerances for the shape of th...

Embodiment 3

[0083] In Embodiments 1 and 2, the sheet sensor 400 having the optical chopper 401 and the marker 402 is described as the gyro sensor 107 . However, other types of sheet sensors may be employed with the present invention. In Embodiment 3, a rotating sheet sensor is described. Note that descriptions of matters common to Embodiment 3 and Embodiments 1 and 2 are omitted.

[0084] Figure 8A to Figure 8F is a diagram illustrating the configuration and operation of the rotating sheet sensor 400'. The sheet sensor 400" has: a shaft 904 serving as a center of rotation; a mark 902 for detecting a sheet S; a light chopper mark 903; and a light chopper 901. The mark 902 and the mark 903 are fixed to the shaft 904, Assume that the sheet S is conveyed from right to left along the conveyance guide 404 .

[0085] Figure 8A The sheet sensor 400' in a state where the sheet S is not fed is shown. exist Figure 8A , the marker 902 is at its original position. In a state where the sheet...

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PUM

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Abstract

The invention discloses an image forming device and a sheet conveying device. A conveying unit conveys sheets on a conveying path, a first detection unit detects the sheets on the conveying path, a determination unit determines the adjusting amount of the interval from the rear end of a former sheet to the front end of a latter sheet according to the difference between a measuring interval and a target interval, a correction unit corrects the adjusting amount according to the difference between a measuring value of length of the former sheet in the conveying direction and a reference value of the length of the former sheet in the conveying direction, and a control unit controls the conveying unit to accelerate or decelerate the conveying speed of the conveying unit within the period corresponding to the adjusting amount corrected by the correction unit.

Description

technical field [0001] The present invention relates to an image forming apparatus and a sheet conveying apparatus. The present invention also relates to printing devices, and more particularly, to image forming devices such as copiers, laser printers, and facsimile machines. Background technique [0002] Japanese Patent Application Laid-Open No. 2002-132765 proposes to measure the sheet interval between the previous sheet and the subsequent sheet before the sheet enters the image forming section, and to speed up the paper feed motor by temporarily accelerating the sheet according to the difference from the target interval. to adjust the sheet spacing. Therefore, the sheet interval can be maintained at the target interval. The sheet interval means the distance or time period from the rear end of the previous sheet to the front end of the subsequent sheet. A sheet sensor is required to measure the sheet interval. Japanese Patent Laid-Open No. 2014-40329 and Japanese Paten...

Claims

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Application Information

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IPC IPC(8): G03G15/00B65H5/06
CPCB65H5/064B65H2220/02B65H2404/15B65H2553/24G03G15/6564
Inventor 谷真希
Owner CANON KK
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