Browse Prior Art Database

Bidirectional Belt Constant Tensioning Device

IP.com Disclosure Number: IPCOM000048221D
Original Publication Date: 1981-Dec-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Bethel, RK: AUTHOR [+2]

Abstract

In electric motor belt driven machines using DC motor logic control, the algorithm allows for only a small variation in friction. The algorithm determines the proper acceleration rates. If the friction varies too much, the control algorithm will not be able to compensate and erroneous acceleration rates will result in hard escapement failures: drifting margins, escapement, piling, etc.

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Bidirectional Belt Constant Tensioning Device

In electric motor belt driven machines using DC motor logic control, the algorithm allows for only a small variation in friction. The algorithm determines the proper acceleration rates. If the friction varies too much, the control algorithm will not be able to compensate and erroneous acceleration rates will result in hard escapement failures: drifting margins, escapement, piling, etc.

One of the major contributors to this friction is the shaft/DC motor belt tension which is normally adjusted by moving the DC motor axis.

The apparatus described herein results in a constant belt tension regardless of the direction of rotation of the DC motor.

The adjustment of the belt tension is no longer critical and can be eliminated.

The mechanism consists of two idlers 10 rotating on arms 12 that pivot on studs 14 that are mounted to the frame (not shown). The arms 12 are coupled together by means of a tension spring 16 which causes the idlers 10 to be loaded against the belt 18. This belt 18 couples the DC motor 20 to the driven shaft 22.

Regardless of rotation and where the belt slack is, the distance 24 and therefore the spring force exerted on the belt 18 through the two idlers 10 remains constant.

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