Damping device for an electromagnetically driven printing hammer

Details Damping device for an electromagnetically driven printing hammer Damping device for an electromagnetically driven printing hammer

1980-05-27

1982-05-18

Coven, Edward M.

Printing

Selective or progressive

Bed and platen machines

100167, B41J 942

Patent

active

043299210

ABSTRACT:
A damping device for a printing hammer which is driven by an electromagnetically actuated pivotable armature has a circuit associated therewith for operating the electromagnetic coils which generates a high excitation current for rapid acceleration of the armature and printing hammer which is followed by a switch over to a considerably lower holding current which maintains the armature in a position to abut the printing hammer during its return stroke. The armature also actuates a rotatable angle lever into engagement with the printing hammer for frictional braking thereof so that the hammer is rapidly damped to a rest position and is ready for a subsequent printing stroke.

REFERENCES:
patent: 2204187 (1940-06-01), Ostler
patent: 3755700 (1973-08-01), Buschmann et al.
patent: 3804009 (1974-04-01), Blume
patent: 4018154 (1977-04-01), Matsumoto et al.
patent: 4062285 (1977-12-01), Deetz et al.
Mathews, IBM Tech. Discl. Bulletin, vol. 19, No. 9, Feb. 1977, pp. 3245-3246.

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