Method for rebound damping of print hammer magnets in typewriter

Details Method for rebound damping of print hammer magnets in typewriter Method for rebound damping of print hammer magnets in typewriter

1988-05-05

1989-11-14

Sewell, Paul T.

Typewriting machines

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

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

4001572, 101 9348, B41J 942

Patent

active

048803227

ABSTRACT:
A method of damping the rebound in print hammer magnets in typewriters or similar office machine in which kinetic energy is removed, in a manner known per se, from the armature of the print hammer magnet returning to its initial position by charging the coil of the print hammer magnet with a so-called braking pulse. The method provides the charging of the coil of the print hammer magnet with measuring pulses during the time when it returns into its initial position and to measure the current flowing through the coil. The increase in current depends on the width of the air gap and therefore permits conclusions as to the position of the armature, so that the braking impulse can be switched on at the correct time.

REFERENCES:
patent: 3909681 (1975-09-01), Campari et al.
patent: 4291992 (1980-09-01), Barr et al.
patent: 4538930 (1985-09-01), Dunfield
patent: 4659969 (1987-04-01), Stupak
patent: 4679116 (1987-07-01), Oshizawa et al.

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