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Automated Operational Shaft Coupling

IP.com Disclosure Number: IPCOM000049603D
Original Publication Date: 1982-Jun-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 2 page(s) / 51K

Publishing Venue

IBM

Related People

Baker, MF: AUTHOR

Abstract

This article describes a means for automatically coupling an operational shaft timing pulley of a mechanical module, such as a typewriter, to a rotary encoder. The primary use of this coupling would be in automated test equipment.

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Automated Operational Shaft Coupling

This article describes a means for automatically coupling an operational shaft timing pulley of a mechanical module, such as a typewriter, to a rotary encoder. The primary use of this coupling would be in automated test equipment.

This device connects an encoder to an operational shaft timing pulley with a reversed timing belt. A reversed timing belt is one which has teeth on the outside perimeter of the belt. By reversing the timing belt, it is able to engage with a timing pulley that would otherwise require a captive timing belt.

The coupling consists of a reversed timing belt 10, a timing pulley 12, three idler pulleys 14, and a belt tensioning arm 16. As the operational shaft 18 rotates, the encoder shaft 20 would replicate the operational shaft motion since they are both engaged to the timing belt. The amount of error in tracking depends on the amount of belt wrap on both pulleys and the fit of the belt teeth to the pulley teeth.

The engagement of the coupling is done by vertically lowering the typewriter module containing the operational shaft 18 into the position shown in the drawing. Since the friction of the coupling is low, it tends to be self-aligning. This allows the belt/pulley teeth to engage and disengage with no operator intervention required.

The purpose of the belt-tensioning arm 16 is to maintain a small amount of belt tension when the operational shaft timing pulley 22 is not present. This retains the belt...