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ADJUSTABLE SPEED CONTROL FOR A DOCUMENT IMAGING SYSTEM

IP.com Disclosure Number: IPCOM000025799D
Original Publication Date: 1988-Apr-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 4 page(s) / 175K

Publishing Venue

Xerox Disclosure Journal

Abstract

The Figure shows an imaging system which incorporates a mechanism to adjust the speed ratio between a document and a moving photoreceptor. Referring to the figure, adjustable speed pulley mechanism 82 comprises a drive pulley 84 having a shaft fixedly mounted to photoreceptor drive shaft 15 and thereby adapted to rotate at the same s eed (process speed) as shaft 15.

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Page 1 of 4

XEROX DISCLOSURE JOURNAL

ADJUSTABLE SPEED CONTROL FOR A DOCUMENT IMAGING SYSTEM William E. Kramer 1nt.Cl. F16h
John E. Forward

Proposed Classification
U.S. C1.74/230

94

Volume 13 Number 2 March/April 1988 53

[This page contains 1 picture or other non-text object]

Page 2 of 4

ADJUSTABLE SPEED CONTROL FOR A DOCUMENT IMAGING SYSTEM (Cont'd)

The Figure shows an imaging system which incorporates a mechanism to adjust the speed ratio between a document and a moving photoreceptor. Referring to the figure, adjustable speed pulley mechanism 82 comprises a drive pulley 84 having a shaft fixedly mounted to photoreceptor drive shaft 15 and thereby adapted to rotate at the same s eed (process speed) as shaft 15.

complementary tooth segments 88,90, each tooth pair connected at the base. An adjustable shaft member 92, having an internally threaded portion, is secured to shaft 86 and can be advanced axially along the threaded portion of shaft 86 by turning know 94 at the outboard end of shaft 92. Mounted towards the inboard side of shaft 92 is cylindrical, tapered slotted member 96. Member 96 is held in place by metal snap rings which are seated in grooves formed in shaft 92. Member 96 has a plurality of blunt-ended, finger-like, tapered tabs 98 separated by rectangular-shaped slots. The tab dimensions are such that they can fit within the spaces between the tooth segment pairs 88, 90. The slots are slightly wider than the tooth segment widths. The ends of tabs 98 rest on some portion of the inter-tooth pair surface, the exact location dependent on the axial position of adjustable shaft member 92.

Clockwise rotation of knob 94 moves shaft member 92, and hence tabs 98, towards the photoreceptor (direction A); counterclockwise rotation has the opposite effect. Thus, movement of member 92 causes the tabs 98 ta move in and out between the rows of segments 88, 90 changin the location of the

diameter of pulley 84. The effective diameter increases when the tapered fingers are moved in direction A and decreases when the fingers are moved in opposite directions.

Pulley 84 has arranged, along its circum tp erence, a plurality of pairs of

tapered surface of the tabs. This movement has the e

k ect of changing the

Continuing with the description, timing belt 80 has a plurality of ridges (teeth) on the entraining surface. Belt 80 is entrained about drive shafts 55A, 56A, which preferably have complementary grooved surfaces. The belt is entrained about, and drive...