Driving device used in a paper separation mechanism

Patent metadata

Field	Value
Publication number	US-2016201741-A1
Application number	US-201514595552-A
Country	US
Kind code	A1
Filing date	Jan 13, 2015
Priority date	Jan 13, 2015
Publication date	Jul 14, 2016
Grant date	—

Abstract

A driving device used in a paper separation mechanism includes an internal gear, an external gear sheathed around the internal gear, a shell of which an inner front face protrudes backward to form a hollow cylinder which the internal gear is sheathed around, an elastic element restrained between a front end of the internal gear and the inner front face of the shell, and a driving member rotatably on the rear of the shell. The driving device utilizes the cooperation of a guide block of the internal gear and a guide groove of spiral shape of the hollow cylinder, the cooperation of a locking arm of the shell and an outer ratchet of the external gear, the cooperation of a slope of the external gear and pushing blocks of the driving member to make a clockwise rotation angle of the driving member be greater than a counterclockwise rotation angle.

First claim

What is claimed is:

1 . A driving device used in a paper separation mechanism, comprising:
an internal gear of cylindric shape, an inner sidewall of the internal gear protruding inward to form a guide block, a plurality of rear meshing teeth being protruded in the rear of the internal gear; an external gear of cylindric shape sheathed around the internal gear, the external gear having an outer ratchet around an outside surface of the external gear and a front ratchet protruded in the front of the external gear, a rear edge of the external gear protruding backward to form a plurality of resist blocks which are spaced from one another to form a plurality of activity grooves each between every two adjacent ones of the resist blocks, one sidewall of each of the resist blocks being designed with a slope, another side wall of each of the resist blocks being a vertical resist surface; a driving member having a substrate, a front face of the substrate protruding forward to form a plurality of front meshing teeth corresponding to the rear meshing teeth of the internal gear, the front face of the substrate protruding forward to form a plurality of pushing blocks which are separately arranged around the front meshing teeth and corresponding to the activity grooves of the external gear; a shell of cylindric shape, an inner front face of the shell protruding backward to form a hollow cylinder, an outside surface of the hollow cylinder defining a guide groove of spiral shape, the inner front face of the shell further protruding backward to form a rear ratchet arranged around the hollow cylinder in the shell and corresponding to the front ratchet of the external gear, a hole being opened through an outer wall of the shell, one side edge of the hole extending towards the other side edge of the hole to form a locking arm, the outer surface curvature of the locking arm being same with that of the outer wall of shell, the free end of the locking arm projecting into the shell; and an elastic element; wherein the internal gear is sheathed around the hollow cylinder, the guide block is slidably located in the guide groove to guide the internal gear and the external gear to rotate and move back and forth in the shell, the free end of the locking arm resists against the outer ratchet of the external gear to stop the external gear rotating counterclockwise, the elastic element is wound around the hollow cylinder and restrained between a front end of the internal gear and the inner front face of the shell, the driving member is rotatably mounted on the rear of the shell, the pushing blocks of the driving member are contained in the activity grooves of the external gear respectively and the rear meshing teeth of the internal gear mesh with the front meshing teeth of the driving member; wherein in use, the paper separation mechanism drives the driving member to rotate counterclockwise, each of the pushing blocks of the driving member slides along the slope of the external gear to push the external gear together with the internal gear to move forward, the guide block of the internal gear slides in the guide groove of the hollow cylinder to guide the internal gear to counterclockwise rotate and further move forward to press the elastic element, until the front ratchet of the external gear meshes with the rear ratchet of the shell, at this point a counterclockwise rotation angle of the driving member is directly proportional to the length of the slope of the external gear; then the elastic element releases the elastic potential energy to push the internal gear together with the external gear to clockwise rotate under the cooperation of the guide block and the guide groove and further move backward, the slope of the external gear pushes the pushing blocks of the driving member to make the driving member rotate clockwise, until the rear meshing teeth of the internal gear mesh with the front meshing teeth of the driving member, at this point a clockwise rotation angle of the driving member is directly proportional to the sum of the length of the slope and the length of the guide groove, so the clockwise rotation angle of the driving member is greater than the counterclockwise rotation angle.

2 . The driving device as claimed in claim 1 , wherein a rear of an inner surface of the outer wall of the shell defines a mounting groove, a groove wall of the mounting groove protrudes inward to form a plurality of buckling blocks which are spaced from a front sidewall of the mounting groove to form a buckling groove between the buckling blocks and the front sidewall of the mounting groove, a ring-shaped buckling rib is protruded around an outside face of the substrate, the buckling rib of the driving member is movably positioned in the buckling groove of the shell and can guide the rotation of the driving member.

3 . The driving device as claimed in claim 2 , wherein a rear of each of the buckling blocks is designed with a guide incline which guides the assembly of the buckling rib and the buckling groove.

4 . The driving device as claimed in claim 1 , wherein the front end of the internal gear protrudes outward to form a circular fastening portion, an inner sidewall of the fastening portion defines a holding groove, a rear end of the elastic element is held in the holding groove and resists against a rear groove wall of the holding groove of the internal gear.

5 . The driving device as claimed in claim 4 , wherein a front end of an inner sidewall of the external gear defines a holding fillister corresponding to the fastening portion of the internal gear, the fastening portion of the internal gear is held in the holding fillister of the external gear.

6 . The driving device as claimed in claim 1 , wherein a back face of the substrate protrudes backward to form a plurality of mounting blocks mounted to the paper separation mechanism.

7 . The driving device as claimed in claim 1 , wherein the elastic element is a spring.

Assignees

• Foxlink Image Tech Co Ltd

Inventors

• Hong I Chuan
• Chen Lung
• Liao Wen Ching
• Kao Shih Chao
• Fang jing hua
• Lin Ming Wei

Classifications

• F16D41/12 Primary

  with hinged pawl co-operating with teeth, cogs, or the like (F16D41/02, F16D41/24 take precedence) · CPC title

• F16H2055/173

  Crown gears, i.e. gears have axially arranged teeth · CPC title

• F16H55/17 Primary

  Toothed wheels (worm wheels F16H55/22; chain wheels F16H55/30) · CPC title

• F16D41/22 Primary

  with clutching ring or disc axially shifted as a result of lost motion between actuating members (F16D41/02, F16D41/24 take precedence) · CPC title

• F16D43/2026

  with a plurality of axially moving parts · CPC title