Adjustable pulleys for mail sorting system

Endless belt power transmission systems or components – Means for adjusting belt tension or for shifting belt,... – Guide roll mounted for movement of its axis along arcuate...

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474135, 271 34, F16H 712

Patent

active

053685245

ABSTRACT:
A tension release mechanism for use with a dancer pulley assembly includes a first horizontal plate having an upper surface and a lower surface, a swing arm having a first end pivotally mounted to the first horizontal plate on the lower surface thereof and being pivotal about a vertical pivot axis A, a second horizontal plate having an upper surface and a lower surface and being spaced vertically above the first horizontal plate by at least one vertical support, a pulley shaft having an upper end and a lower end, the lower end being mounted on the second end of the swing arm and extending upwardly through an arcuate opening formed in the first horizontal plate, a dancer pulley rotatably mounted on the pulley shaft between the first and second horizontal plates for rotation about a vertical rotation axis B and being swingable on the swing arm through an arc defined by a distance between the pivot axis A and the rotation axis B, a guide for guiding the upper end of the pulley shaft during swinging motion of the dancer pulley, and a mechanism for adjusting the guide to maintain a substantially vertical orientation of the rotation axis B.

REFERENCES:
patent: 3863517 (1975-02-01), Pareja
patent: 4270906 (1981-06-01), Kraft et al.
patent: 4507104 (1985-03-01), Clark et al.
patent: 4532844 (1985-08-01), Chang et al.
patent: 4568318 (1986-02-01), Johnson et al.
patent: 4966571 (1990-10-01), de Guillebon

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