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Browse Prior Art Database

Phase Adjustor For Synchronously Driven Shafts

IP.com Disclosure Number: IPCOM000048754D
Original Publication Date: 1982-Mar-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Karidis, JP: AUTHOR

Abstract

This article describes a mechanism for adjusting the longitudinal paper tension in printers by changing the phase relationship between two tractor shafts connected with the timing belt. Timing belt tension is automatically reset to the proper value when the phase relationship is changed.

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Phase Adjustor For Synchronously Driven Shafts

This article describes a mechanism for adjusting the longitudinal paper tension in printers by changing the phase relationship between two tractor shafts connected with the timing belt. Timing belt tension is automatically reset to the proper value when the phase relationship is changed.

Two Idler pulleys 10 and 11, mounted on pivoting arms 12 and 13, take up the slack in timing belt 14. Spring 15 spring loads arms 12 and 13 to provide the proper timing belt tension. When arm 12 is moved, the length of timing belt 14 changes so that tractor shafts 16 and 17 rotate slightly relative to one another. Arm 13 is free to move and repositions itself to maintain proper timing belt tension. A single knob 18 or wing nut is then used to lock both arms 12 and 13 to the machine frame, thereby locking the phase relationship and the timing belt tension.

Use of this invention speeds machine assembly since drive pulleys do not have to be as accurately positioned on shafts. Also, shaft centered distances are not as critical.

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