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Browse Prior Art Database

TORSION BAR COUNTERBALANCE MECHANISM

IP.com Disclosure Number: IPCOM000026767D
Original Publication Date: 1993-Aug-31
Included in the Prior Art Database: 2004-Apr-06
Document File: 2 page(s) / 103K

Publishing Venue

Xerox Disclosure Journal

Abstract

Disclosed is a low cost and space saving counter-balance mechanism for counter-balancing heavy objects such as a recirculating document handler (RDH) in xerographic copiers. Counter-balance mechanism 2, which consists of two torsion bars 3 and 4 coupled via gearset 5, having gears 6 and 7, is shown in Figure 1. The overall length (L/2) of the counter-balance 2 is reduced by placing the torsion bars 3 and 4 side-by-side. The disclosed low cost counter-balance mechanism design solves two problems frequently associated with a torsion bar type counter-balance design. First, long span length is reduced by a factor of two (or more) through the use of gearset 5 that couples folded torsion bar spans 3 and 4. Second, the spring rate is precisely adjustable by moving the location of mating gear pair 6 and 7.

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XEROX DISCLOSURE JOURNAL

TORSION BAR COUNTER- BALANCE MECHANISM Lam F. Wong

Proposed Classification
U.S. C1.355/014 Int. C1. G03g 15/00

9

XEROX DISCLOSURE JOURNAL - VO~. 18, NO. 4 July/August 1993 381

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TORSION BAR COUNTER-BALANCE MECHANISM(Cont'd)

Disclosed is a low cost and space saving counter-balance mechanism for counter-balancing heavy objects such as a recirculating document handler (RDH) in xerographic copiers. Counter-balance mechanism 2, which consists of two torsion bars 3 and 4 coupled via gearset 5, having gears 6 and 7, is shown in Figure 1. The overall length (L/2) of the counter-balance 2 is reduced by placing the torsion bars 3 and 4 side-by-side. The disclosed low cost counter- balance mechanism design solves two problems frequently associated with a torsion bar type counter-balance design. First, long span length is reduced by a factor of two (or more) through the use of gearset 5 that couples folded torsion bar spans 3 and 4. Second, the spring rate is precisely adjustable by moving the location of mating gear pair 6 and 7.

Fine tuning of the spring rate of the torsion bars 3 and 4 is accomplished by sliding gearset 5 along bars 3 and 5 as shown by arrow 9, thereby changing the torsion bars effective lengths. Using the following equation:

dT/de = GIpL where:

      T = torque, 0 = angle of angular deflection, G = modulusofshear,
Ip = polar area moment of inertia, and L = length of tors...