Two way wrap spring clutch gear

Details Two way wrap spring clutch gear Two way wrap spring clutch gear

1999-02-03

2000-09-12

Eickholt, Eugene

Typewriting machines

Sheet or web

For feeding web record-medium

192 33C, 192415, 192 81C, 192104C, B41J 1126

Patent

active

061167975

ABSTRACT:
A gear mechanism containing a clutch assembly made of an outer member with an offset hub, a wrap spring, a pin wherein the rotation of the pin around the offset hub is less than one revolution. A protrusion on a stop at a fixed location is used to dislodge the wrap spring such that it is incapable of transferring torque to the pin. With the spring dislodged, the pin ceases rotation as the hub continues to rotate. Once the power source reverses the rotation, the spring engages the pin which causes the spring to tighten around the hub. The tightening of the spring causes the spring to transmit torque and consequently move the pin away from the stop. In applications where, in one direction, a rotation of less than one revolution is acceptable, the use of a fixed protrusion to dislodge the spring allows the full torque of the driving member to drive the mechanism in either rotational direction.

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