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Pressure-adjustable mechanism for paper feeding roller of automatic paper feeder

a technology of automatic paper feeder and paper feeding roller, which is applied in the direction of transportation and packaging, thin material processing, article separation, etc., can solve the problems of paper feeding and paper dispensing difficulty, weight or paper sheet amount, etc., and achieve the effect of accurate paper dispensing

Inactive Publication Date: 2012-09-25
INTELLECTUAL VENTURES I LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008]It is therefore a primary object of the present invention to provide a pressure-adjustable mechanism for paper feeding roller in an automatic paper feeder, so that a pressure from the paper feeding roller is automatically adjusted when there is an increased amount of paper sheets stacked on the paper tray of the automatic paper feeder, and that an accurate paper dispensing is maintained.
[0010]A further object of the present invention is to provide a self-adjustable pressure-adjustable mechanism for paper feeding roller in an automatic paper feeder, wherein a movable paper tray is pivotally lowered due to a weight of paper sheets stacked thereon and thereby lifts the paper feeding roller by a proper distance and adjusts a paper feeding angle of the paper tray as well as a frictional pressure between the paper feeding roller and a paper separating plate, so that good paper dispensing effect could be maintained.

Problems solved by technology

Problems such as difficult paper feeding and paper dispensing occur when the weight or the amount of paper sheets 3 on the paper tray 21 increases.

Method used

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  • Pressure-adjustable mechanism for paper feeding roller of automatic paper feeder
  • Pressure-adjustable mechanism for paper feeding roller of automatic paper feeder
  • Pressure-adjustable mechanism for paper feeding roller of automatic paper feeder

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first embodiment

[0019]Please refer to FIG. 3 that is a sectioned side view of a pressure-adjustable mechanism for paper feeding roller in an automatic paper feeder according to the present invention. In this embodiment, the pressure-adjustable mechanism mainly includes a movable paper tray 4 on which a plurality of paper sheets 40 may be stacked. The movable paper tray 4 is rotatably supported on a supporting shaft 41 mounted to a fixed position in the automatic paper feeder, so that a length of the movable paper tray 4 to the left side of the supporting shaft 41, as viewed in front of FIG. 3, forms a paper supporting end 4a, and an end of the paper tray 4 opposite to the end 4a forms a paper-out end 4b.

[0020]A paper feeding roller 5 is located downstream closely below the paper-out end 4b of the movable paper tray 4, and a paper separating mechanism 61 and a paper separating plate 62 are located downstream closely above the paper-out end 4b of the movable paper tray 4, so that a proper gap is prov...

second embodiment

[0026]FIG. 4 is a sectioned side view of a pressure-adjustable mechanism for paper feeding roller in an automatic paper feeder according to a second embodiment of the present invention. the present invention has a structure generally similar to that of the first embodiment shown in FIG. 3, except that the paper tray pressure detecting mechanism further includes a guiding post 71 provided at the bottom side of the movable paper tray 4 to extend toward the pressure transfer member 81 by a proper distance. The spring element 7 is put around the guiding post 71 to avoid undesired deviation of the spring element 7 when the same is compressed or extended due to changes in the weight of paper sheets 40 on the movable paper tray 4.

third embodiment

[0027]FIG. 5 is a sectioned side view of a pressure-adjustable mechanism for paper feeding roller in an automatic paper feeder according to a third embodiment of the present invention. the present invention also has a structure generally similar to that of the first embodiment shown in FIG. 3, except that the paper tray pressure detecting mechanism includes an arched leaf spring 72 to replace the spring element 7. An apex 72a of the arched leaf spring 72 is pressed against the bottom side of the movable paper tray 4, and two free ends 72b, 72c of the arched leaf spring 72 are pressed against the pressure transfer member 81. The arched leaf spring 72 functions equally well as the spring element 7 to transfer the pressure of paper on the movable paper tray 4 to the pressure transfer member 81.

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Abstract

An automatic paper feeder for an image-scanning device with a pressure-adjustable mechanism for adjusting the paper feeding roller of the automatic paper feeder is disclosed. A pressure from paper sheets stacked on a paper tray of the automatic paper feeder is detected by a paper tray pressure detecting mechanism and transferred to a roller pressure adjusting mechanism to change a pressure between the paper feeding roller and a paper separating plate and adjust a feeding angle of the movable paper tray.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to an automatic paper feeder for an image-scanning device, and more particularly to a pressure-adjustable mechanism for the paper feeding roller of the automatic paper feeder.[0003]2. Description of the Prior Art[0004]An automatic paper feeder is frequently included in various kinds of office automation equipment, such as image-scanning device, photocopier, printer, etc., so that paper sheets to be scanned, copied or printed could be automatically separated and fed via the automatic paper feeder. FIG. 1 illustrates a scanner 1 and a conventional automatic paper feeder 2 associated therewith. The scanner 1 is internally provided with an optical scanning module 11, a pair of guide bars 12, and related optical components, such as focusing lens, image sensor, driving mechanism, etc. The optical scanning module 11 is moved along the guide bars 12 under control of a control circuit of the scanner...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): B65H3/52B65H3/06
CPCB65H3/063B65H3/5238B65H2402/54B65H2405/1117B65H2515/10B65H2515/34B65H2220/01B65H2220/08B65H2220/02B65H2220/11
Inventor CHIANG, SHU-YA
Owner INTELLECTUAL VENTURES I LLC