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TIMING BELT DERAILER

IP.com Disclosure Number: IPCOM000024343D
Original Publication Date: 1980-Jun-30
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 68K

Publishing Venue

Xerox Disclosure Journal

Abstract

A multi-speed drive, which includes a derailer mechanism, is used as a transmission for driving a multi-speed document handler in an automatic office copier. Figure 1 is a cross section of the derailer mechanism in which a drive belt 8 is shifted from a first small pulley 10 to a second large pulley 12 when the cam 14 is rotated thereby pushing the belt between the flanges of the smaller pulley 10 and the spiral cam surface 18 on the cam flange 20. In this manner, the spiral cam assists in making the belt quickly climb from the smaller pulley to the larger pulley and

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XEROX DISCLOSURE JOURNAL

TIMING BELT DERAILER
T. N. Taylor Robert Schlode r

Proposed Classification
U.S. C1. 74/230.17 Int. C1. F16h 55/52

A multi-speed drive, which includes a derailer mechanism, is used as a transmission for driving a multi-speed document handler in an automatic office copier. Figure 1 is a cross section of the derailer mechanism in which a drive belt 8 is shifted from a first small pulley 10 to a second large pulley 12 when the cam 14 is rotated thereby pushing the belt between the flanges of the smaller pulley 10 and the spiral cam surface 18 on the cam flange 20. In this manner, the spiral cam assists in making the belt quickly climb from the smaller pulley to the larger pulley and

Volume 5 Number 3 May/June 1980 227

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

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TIMING BELT DERAILER (Cont'd)

thereby alters the drive speed of a drive shaft attached to the derailer. In Figure 2, the belt 8 is driven from motor pulley 22, which translates the drive motion through the derailer to a drive shaft. In Figure 2, the belt is depicted on the larger pulley and the extra belt length for the large pulley is available by virtue of the spring loaded idler roll 24 dropping down. When the belt 8 is driving the smaller diameter pulley, the idler roll 24 is urged to an up position taking up the slack in the belt. It should be understood that a derailer mechanism with more than two speeds may be used employing the same principle.

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