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Browse Prior Art Database

Gear Loading Mechanism

IP.com Disclosure Number: IPCOM000083261D
Original Publication Date: 1975-Apr-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Cimijotti, RL: AUTHOR [+2]

Abstract

This device reduces the noise generated by a gear train. It is especially effective in a phase-lock system, where one independently driven section of a document transport is prohibited from running faster than another independently driven section.

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Gear Loading Mechanism

This device reduces the noise generated by a gear train. It is especially effective in a phase-lock system, where one independently driven section of a document transport is prohibited from running faster than another independently driven section.

Referring to Fig. 1, timing belt 2 rotates shaft 1 which drives gear 4 and clutch assembly 5. Gears 3 and 4 connect the two transport sections together with normal tooth clearance and backlash.

Since the driven gear 4 and clutch assembly 5 are normally operating in an unloaded condition. the shaft-to-clutch bearing clearance and gear tooth clearance cause excessive noise.

Fig. 2 shows the addition of a soft rubber or plastic tire 6 molded on the clutch assembly housing 5 which is attached to gear 4. A mating steel boss 7 is attached to gear 3. Tire 6 is slightly larger than the pitch diameter of gear 4 (Fig.
3). Boss 7 is slightly smaller in diameter than the pitch diameter of gear 3. Tire 6 is compressed by boss 7 at their contact point causing a load on the clutch bearing, with the center distance between gear 3 and gear 4 being standard.

As the gears rotate, boss 7, being smaller in diameter, tries to drive tire 6 and gear 4 slower. But since the gears lock the two sections together, tire 6 deflects in shear, keeping a constant force on the gear teeth of both gears 3 and 4 (Fig.
3).

This constant force on gear 3 and gear 4 reduces the noise to an acceptable level.

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