Damping apparatus for a print hammer mechanism

Details Damping apparatus for a print hammer mechanism Damping apparatus for a print hammer mechanism

1986-10-20

1988-02-02

Burr, Edgar S.

Typewriting machines

Including type-set-assemblage mounted on carrier and...

Imprint by pivoting of type-head-carrier and type-head...

101 9302, 101 9348, 400457, B41J 730

Patent

active

047226226

ABSTRACT:
Damping apparatus for minimizing print hammer settle time permits an increase in the hammer repetition rate, and in which the damping element is a reactive mass which is freely movable behind the actuated element to effect one or more energy transfer collisions with the actuated element. A return spring applies a return force to restore the actuated element and the reactive mass to a rest position. A bias spring, having an applied spring force which is lower than the return spring moves the reactive mass at a slower rate than the actuated element to cause the actuated element to collide with the reactive mass in advance of the rest position whereby the rebound energy of the actuated element is dissipated and restoration of the actuated element can occur as a result of the restore force applied by the return spring. In one embodiment, the reactive mass comprises a backstop assembly movable from the rest position by a spring and comprises a pair of relatively movable damping masses coupled by resilient energy absorbing material.

REFERENCES:
patent: 4603985 (1986-08-01), Helinski et al.
patent: 4613243 (1986-09-01), Rossi et al.

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