Hammer lock releasing mechanism for a printing device

Details Hammer lock releasing mechanism for a printing device Hammer lock releasing mechanism for a printing device

1981-09-25

1984-11-20

Burr, Edgar S.

Printing

Selective or progressive

Bed and platen machines

B41J 928

Patent

active

044832494

ABSTRACT:
A printing device comprises a rotary type wheel provided on its outer surface with a plurality of types disposed at equal angular intervals and in at least one column, a printing hammer head disposed confronting said type wheel and undergoing displacement, in printing operation, to strike a desired type selectively onto a sheet of paper thereby to carry out printing, means for urging the hammer head to move in the direction of carrying out printing action, a mechanism for locking the hammer head in a non-printing position, and a mechanism for releasing the hammer head from its locked state by means of the locking mechanism. The locking mechanism comprises a locking member for locking the hammer head and a first spring for urging the locking member so as to make locking operation. The releasing mechanism comprises a single electromagnet, a second spring facing the electromagnet in spaced-apart relation which is caused to displace when the electromagnet is operated, a locking member displacing together with the second spring, an unlocking cam rotating correspondingly with the rotation of the type wheel and engaging the engaging catch displaced to further move the engaging catch thereby to release the locked state of the hammer head locked by the locking member.

REFERENCES:
patent: 1705803 (1929-03-01), Brush et al.
patent: 3848527 (1974-11-01), Nihira
patent: 4326459 (1982-04-01), Iwao et al.

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