Browse Prior Art Database

LOW NOISE PULLEY HAVING BI-DIRECTIONAL SLOTS

IP.com Disclosure Number: IPCOM000026512D
Original Publication Date: 1992-Jun-30
Included in the Prior Art Database: 2004-Apr-06
Document File: 2 page(s) / 78K

Publishing Venue

Xerox Disclosure Journal

Abstract

Excessive noise from copiers and similar office machines in work environments has been an irritant to users from the advent of such machines. One of the major noise contributors in these machines has been found to be timing belts, where the engagement between the teeth of the belts and the pulleys creates noise. As the air pockets between the teeth of the belts and the pulleys are displaced periodically along the lateral direction of motion, the disturbance modulates air in the surrounding areas and generates noise. The noise level is proportional to a number of things, for example, the volume and the rate at which the air pockets are displaced.

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XEROX DISCLOSURE JOURNAL

LOW NOISE PULLEY HAVING BI- DIRECTIONAL SLOTS U.S. C1.474/152 Gail J. Levy

Proposed Classification

Int. C1. F16H 55/30

FIG. 2

XEROX DISCLOSURE JOURNAL - Vol. 17, No. 3 May/June 1992 197

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LOW NOISE PULLEY HAVING BI-DIRECTIONAL SLOTS(Cont'd)

Excessive noise from copiers and similar office machines in work environments has been an irritant to users from the advent of such machines. One of the major noise contributors in these machines has been found to be timing belts, where the engagement between the teeth of the belts and the pulleys creates noise. As the air pockets between the teeth of the belts and the pulleys are displaced periodically along the lateral direction of motion, the disturbance modulates air in the surrounding areas and generates noise. The noise level is proportional to a number of things, for example, the volume and the rate at which the air pockets are displaced.

In Figures 1 and 2, a low noise timing belt pulley, 10, is shown in one embodiment which employs exhaust slots 18 cut into land regions 11 between the teeth, 13, in order to allow air to escape during impact of the belt teeth with the pulley. The slots, or grooves, 18 are alternately cut in both directions, as shown in the partial side view of Figure 2, and air is allowed to escape in one of the directions when the teeth of the pulley come into contact with the land or valley region of the belt....