Sheet conveying device, image forming apparatus, and image reading apparatus

A conveying device and sheet material technology, which is applied in the direction of transportation and packaging, thin material handling, object separation, etc., can solve the problems of insufficient paper holding force, unstable holding state, increased noise, etc., and achieve stable conveying accuracy, Effect of suppressing stick-slip vibration and reducing sliding friction sound

Active Publication Date: 2014-02-19
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the holding state of the friction pad 148 to the paper is very unstable, and the holding force to the paper is not sufficient.
Therefore, it is in a situation where stick-slip vibration is likely to occur, and the occurrence of this vibration becomes an abnormal sound or causes an increase in noise.

Method used

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  • Sheet conveying device, image forming apparatus, and image reading apparatus
  • Sheet conveying device, image forming apparatus, and image reading apparatus
  • Sheet conveying device, image forming apparatus, and image reading apparatus

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Experimental program
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no. 2 approach

[0129] Next, according to Figure 5A and Figure 5B A second embodiment of the present invention will be described. In the second embodiment, the upstream upper surface 50B2 on the upstream side of the top 50B1 of the guide portion 50B is formed in an arc shape convex upward, and the downstream upper surface 50B3 on the downstream side of the top 50B1 is formed in a circular arc shape. The same inclined flat surface 50B3 as in the first embodiment. The other configurations are the same as those of the first embodiment. By forming the upper surface 50B2 on the upstream side in such a circular arc shape, the entry angle of the front end of the paper P when placed on the upper surface of the guide portion 50B is relaxed, thereby preventing paper non-feeding when the transport load is too large.

[0130] The downstream upper surface 50B3 may also be formed in an upwardly convex arc shape similarly to the upstream upper surface 50B2. By forming the upper surface 50B3 on the dow...

no. 3 approach

[0132] Next, according to Figure 6A and Figure 6B A third embodiment of the present invention will be described. In the third embodiment, the upstream upper surface 50C2 on the upstream side from the top 50C1 of the guide portion 50C is formed in a continuous concave-convex shape with a height difference of 1 mm or less. The other configurations are the same as those of the first embodiment. With this continuous concave-convex shape, when a plurality of sheets of paper enters the upper surface of the guide portion 50C in a bundle, the leading ends of the individual papers hit the continuous concave-convex shape, are shifted into steps, and are sorted. Therefore, the effect of suppressing double-feeding by the conveying device can be enhanced by the continuous concavo-convex shape. The height difference of the continuous concave-convex shape is preferably less than 1mm, and when it exceeds 1mm, the step-like staggering effect is reduced because multiple pages of paper will...

no. 4 approach

[0134] Next, according to Figure 7A and Figure 7B A fourth embodiment of the present invention will be described. In the fourth embodiment, the upstream upper surface 50D2 upstream of the top 50D1 of the guide portion 50D and the downstream downstream upper surface 50D3 are connected by a common arc of radius r. Thereby, when the front end of the paper P rests on the guide portion 50D, the angle at which the paper P enters becomes gentle, and it is possible to prevent paper non-feeding when the conveyance load is too large. In addition, when the rear end of the paper moves away from the guide portion 50D, the rear end of the paper can be suppressed from bouncing up, thereby avoiding collision of the rear end of the paper with the downstream side surface of the friction pad 48 and achieving noise reduction. In addition, by forming the upper surfaces 50D2 and 50B3 of the guide portion 50D in an arc shape (curved surface shape), manufacturing of the member can be facilitated,...

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Abstract

A sheet conveying device (40A through 40G, 95) includes a holder (49), a friction member (48), a rotary conveyance member (47) forming a nip area (N2) between an outer circumferential surface thereof and the friction member (48), rotating while contacting the friction member (48), and separating and convey multiple sheet-like materials (P) one by one at the nip area (N2), and a pair of guides (50A through 50H) configured to lift an underside of each of the sheet-like materials (P) facing the friction member (48), the pair of guides (50A through 50H) disposed upstream from the nip area (N2) in a sheet conveying direction, outside both ends in an axial direction of the rotary conveyance member (47), separate from the nip area (N2) from the axial direction of the rotary conveyance member (47), and being substantially even with the outer circumferential surface of the rotary conveyance member (47).

Description

technical field [0001] The present invention relates to a sheet-shaped object conveying device for conveying a sheet-shaped object used as a recording medium, and an image forming apparatus, image reader, etc. Take the device. Background technique [0002] Image forming apparatuses such as copiers, printers, and facsimiles are equipped with a paper feed tray that stores a plurality of sheets (paper) in a stacked state. Sheets of paper are fed from the paper feed tray to the image forming unit one by one. A paper conveying device (paper feeding device) is used to feed the paper sheet by sheet. This paper conveying device is equipped with a separation conveying mechanism such as a friction pad method, a FRR friction reverse roller feeding method, or a corner separator feeder in order to separate and convey paper. [0003] The friction pad method is a structure in which a friction pad as a friction member biased by a spring or the like is pressed against the outer peripheral...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B65H3/06
CPCB65H3/5223B65H3/46B65H2301/51212B65H3/66B65H3/56B65H2404/52B65H2404/513
Inventor 木村一平田中瑞来藤井郁夫堀田浩史
Owner RICOH KK
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