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Browse Prior Art Database

LOW NOISE PULLEY FOR TIMING BELT

IP.com Disclosure Number: IPCOM000026487D
Original Publication Date: 1992-Apr-30
Included in the Prior Art Database: 2004-Apr-06
Document File: 2 page(s) / 88K

Publishing Venue

Xerox Disclosure Journal

Abstract

Excessive noise from copiedprinters in working environments has been an irritant to users from the advent of such machines until the present day. One of the major contributors to machine noise has been found to be timing belts where engagement between the teeth of the belts and the pulleys emit 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 of the air pockets being displaced and the rate at which they are displaced.

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XEROX DISCLOSURE JOURNAL

LOW NOISE PULLEY FOR TIMING BELT U.S. C1.474/152 Gail J. Levy

Proposed Classification

Int. C1. F16H 55/30

18

FIG. IB

XEROX DISCLOSURE JOURNAL - Vol. 17, No. 2 March/Aprill992 123

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LOW NOISE PULLEY FOR TIMING BELT(Cont'd)

Excessive noise from copiedprinters in working environments has been an irritant to users from the advent of such machines until the present day. One of the major contributors to machine noise has been found to be timing belts where engagement between the teeth of the belts and the pulleys emit 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 of the air pockets being displaced and the rate at which they are displaced.

Accordingly, a low noise timing belt pulley is described that in one embodiment employs perforations cut into the top surface of the teeth in order to allow air to escape in all directions during impact of the pulley teeth with the belt, thereby reducing the noise generated in the process. If air in pockets between the teeth of belts and pulleys is allowed to escape in all directions, the acoustic energy at the mesh frequency and harmonics will be minimized. A preferred means of accomplishing this is s...