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Spring Loaded Automatic Belt Tensioner

IP.com Disclosure Number: IPCOM000052491D
Original Publication Date: 1981-Jun-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Blaskovic, SU: AUTHOR [+3]

Abstract

When a mass such as a wire matrix print head, is driven by a drive belt, it is necessary to maintain proper belt tension on the print head drive belt to prevent numerous problems. If the belt tension is too low, the drive system becomes elastic, making speed control difficult, whereby print quality can suffer. Conversely, when the belt tension is too high, excessive friction and short belt life result.

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Spring Loaded Automatic Belt Tensioner

When a mass such as a wire matrix print head, is driven by a drive belt, it is necessary to maintain proper belt tension on the print head drive belt to prevent numerous problems. If the belt tension is too low, the drive system becomes elastic, making speed control difficult, whereby print quality can suffer. Conversely, when the belt tension is too high, excessive friction and short belt life result.

To manually adjust belt tension on each machine is expensive. This entails the following procedure. Midway between the drive and idler pulley, a force gage is placed to measure and deflect the belt to a predetermined load. The amount of belt deflection is measured, and an adjustment nut is either tightened or loosened. By trial and error, this procedure eventually obtains the proper belt tension. When a belt needs to be replaced in the field, it is unlikely that a serviceman can perform the tension adjustment without special tools.

The apparatus shown in the figure provides a means for proper belt tensioning without having to measure and adjust. A bolt 16 is placed between bracket 12 and machine frame 17, and a spring 18 is secured thereon by nuts 19 on the outside of frame 17. The pulley 10 is mounted to bracket 12 by a pin 14 at point "B". The bracket 12 is free to pivot about the pin 22 at "C" The bolt 16, at point "A", transmits the load of the spring 18 to the bracket 12. The compression load in the spring 18 sets the bel...