Print hammer damping mechanism for typewriters and like printing

Details Print hammer damping mechanism for typewriters and like printing Print hammer damping mechanism for typewriters and like printing

1988-06-17

1990-02-13

Wiecking, David A.

Typewriting machines

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

Imprint by movement of record-medium against type-face

400167, 400686, 101 9302, B41J 938

Patent

active

049001698

ABSTRACT:
The print apparatus comprises a character-carrying element of the `daisywheel` type with flexible spokes which can be selectively positioned in front of a platen roller, a print hammer for moving a selected character towards the platen roller, an actuating solenoid for the print hammer and a damping mechanism which acts on the hammer after the printing of each character. The hammer is directly connected to a movable armature of the solenoid and is returned by a return spring.
During the return phase, the armature displaces, against a travel limiting stop, a counteracting weight which is urged towards an intermediate stop by the force of a counteracting spring. A first damping element is disposed between the movable armature and the counteracting weight and a second damping element is disposed between the weight and the travel limiting stop. The two damping elements, operating sequentially, minimize the time required for the hammer to settle down.

REFERENCES:
patent: 3134932 (1964-05-01), Ray
patent: 3400351 (1968-09-01), Flentge
patent: 4308794 (1982-01-01), Adamoli et al.
patent: 4422784 (1983-12-01), Arzoumanian et al.
patent: 4430936 (1984-02-01), Adamoli et al.
patent: 4490057 (1984-12-01), Reece
patent: 4496253 (1985-01-01), Morsing
patent: 4613243 (1986-09-01), Rossi et al.
S. Mitrovich, "Multi-Impact Backstop for Print Hammer", Xerox Disclosure Journal, vol. 1, No. 4, p. 21; Apr. 1976.

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