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Compensating Idler System for Bidirectional Belt Drive

IP.com Disclosure Number: IPCOM000082180D
Original Publication Date: 1974-Oct-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Shuman, RB: AUTHOR

Abstract

Fig. 1 shows a pulley and belt drive. If pulley 10 is clutched in, output pulley 12 is driven counterclockwise and pulley 14 spins freely. If pulley 14 is clutched in, output pulley 12 is driven clockwise and pulley 10 spins freely.

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Compensating Idler System for Bidirectional Belt Drive

Fig. 1 shows a pulley and belt drive. If pulley 10 is clutched in, output pulley 12 is driven counterclockwise and pulley 14 spins freely. If pulley 14 is clutched in, output pulley 12 is driven clockwise and pulley 10 spins freely.

To account for varying center distances in the assembled mechanism and minute belt-to-belt length variations, an idler 16 is normally supplied in an adjustable manner to allow for take-up of the belt slack to prevent teeth from jumping while driving. The idler 16 is on the tight side of the belt 8 whenever pulley 14 is clutched in and driving, causing the belt to transmit driving tension through a reverse bend.

The arrangement shown in Figs. 2 and 3 greatly reduces the reverse bending on the tight side of the belt 8, as encountered in the mechanism shown in Fig. 1. This mechanism consists of two idlers 18 and 20, each mounted to a pivot arm 22, 24, respectively. The two arms pivot freely and independently about point 28. The arms are joined by an extension spring 26 which pulls idlers 18 and 20 against the belt 8, as shown. When pulley 10 is driving, the belt 8 under idler 18 is drawn tight as shown in Fig. 2, causing the belt to straighten and lift idler 18 and its pivot arm 22. Spring 26 causes idler 20 and its pivot arm 24 to move and take up slack in the belt 8, as shown. When pulley 14 is driving as shown in Fig. 3, idler 20 is displaced as the adjacent portion of belt 8 tigh...