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Rotary coder, roller, belt conveying device and image forming device

A rotary encoder and conveying device technology, which is applied in the direction of transmitting sensing components with optical devices, can solve the problems of inability to correctly detect the rotation state of the code disc, unstable driving and control of roller components, etc., and achieve improved detection reliability and low price. Inexpensive, good maintenance effect

Inactive Publication Date: 2006-11-01
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the code part 50a is deformed, the encoder sensor cannot accurately detect the rotation state of the code disc 72 or the roller member, and the drive control of the roller member becomes unstable.

Method used

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  • Rotary coder, roller, belt conveying device and image forming device
  • Rotary coder, roller, belt conveying device and image forming device
  • Rotary coder, roller, belt conveying device and image forming device

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0055] FIG. 1 is a diagram showing the overall configuration of an image forming apparatus according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of an imaging unit in the image forming apparatus of FIG. 1 .

[0056] In FIGS. 1 and 2, reference numeral 100 denotes an apparatus main body of a color printer as an image forming apparatus, reference numeral 2 denotes an optical writing unit that emits laser light based on image information, and reference numerals 20Y, 20M, 20C, and 20BK denote colors ( yellow, magenta, cyan, black) corresponding to the process cartridges, the symbol 21 represents the photoreceptor drums respectively accommodated in the process cartridges 20Y, 20M, 20C, 20BK, the symbol 22 represents the charging part for charging the photoreceptor drum 21, Reference numeral 23 denotes a developing section for developing the electrostatic latent image formed on the photoreceptor drum 21 , reference numeral 24 denotes a transfer rol...

no. 2 example

[0104] refer to Figure 7 , to describe the second embodiment of the present invention in detail.

[0105] The second embodiment is the same as the above-mentioned first embodiment, and a driven roller 47 provided with a rotary encoder is provided in the transfer belt assembly 30 . The rotary encoder of the second embodiment is also composed of a code wheel 72, a transmissive optical sensor, a support plate 71 (support member), a cover, and the like, as in the above-mentioned first embodiment.

[0106] In this embodiment, the support plate 71 is pressed into the shaft portion 47b, the contact area between the support plate 71 and the shaft portion 47b is set as M, and the code wheel 72 is fixed at a distance away from the press-in area M (actually related to the press-in area). Location. Specifically, the axial diameter of the area N between the press-fit region M and the fixed position of the code wheel 72 (the shaft diameter of the shaft portion 47a ) is smaller than the s...

no. 3 example

[0110] refer to Figure 8 , to describe the third embodiment of the present invention in detail.

[0111] Figure 8 Shows a partial sectional view of the driven roller 47 according to the third embodiment of the present invention, which is the same as that of the above-mentioned second embodiment of the present invention Figure 7 quite. The difference is that in this embodiment, the inner diameter portion of the support plate 71 forms a small diameter portion and a large diameter portion. On the other hand, in the above-mentioned second embodiment of the present invention, the inner diameter of the support plate 71 is uniform, and the small diameter portion 47a and the large diameter portion 47b are formed on the shaft portion.

[0112] The third embodiment is the same as the above-mentioned second embodiment, and a driven roller 47 provided with a rotary encoder is provided in the transfer belt assembly 30 . The rotary encoder of the third embodiment is also composed of ...

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Abstract

The present invention relates to a rotary encoder for detecting changes in the rotational speed or rotational angle of a roller member, a roller member provided with the rotary encoder, a belt conveying device and an image forming device. The rotary encoder of the present invention includes: a support member 71 that is fixed to the shaft portion 47c of the roller member 47 and rotates with the roller member 47; a code wheel that is fixed on the support member 71 and rotates with the support member 71 ; and the housing 73 . The cover 73 is supported by the shaft 47 a via a bearing 74 provided on the shaft 47 a, and covers the code wheel 72 together with the support member 71 , and the shaft 47 a is rotatable relative to the cover 73 . An encoder sensor 51 is also provided, which is installed in the above-mentioned housing 73 and detects the rotation of the code wheel 72 . No malfunctions such as misdetection due to adhesion of foreign matter such as toner or braking due to adhesion of foreign matter will not occur, and it is inexpensive, compact, and easy to maintain.

Description

technical field [0001] The present invention relates to a rotary encoder for detecting changes in the rotational speed or rotational angle of a roller member, a roller member provided with the rotary encoder, a belt conveying device and an image forming device. Background technique [0002] In image forming devices such as copiers, printers, facsimile machines, compound machines, etc., it is common to have a roller member erected with a belt member structure. In order to detect changes in the rotational speed or rotational angle of the roller member, it is known to use a rotary encoder, such as , Japanese Unexamined Patent Publication No. 2002-248822 (hereinafter abbreviated as "Patent Document 1") can be cited. [0003] Specifically, in the aforementioned Patent Document 1, a code wheel is integrally provided on the shaft portion of a roller member (conveying roller), radial code sections are formed on the main surface of the code wheel, and the image forming apparatus ( T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/36
Inventor 山形正信
Owner RICOH KK