Printing device

Details Printing device Printing device

1978-08-22

1979-11-13

Coven, Edward M.

Printing

Selective or progressive

Bed and platen machines

400 56, 400 57, B41J 792

Patent

active

041739272

ABSTRACT:
A printing device in which a roll having a plurality of characters disposed thereon is displaceable with respect to at least one printing hammer. The printing hammer cooperates with a coil which, when excited, generates a field which by cooperation with a stationary field, puts the hammer into motion and drives it against the character on the roll to be printed. The hammer is arranged to be movable in the device so that the distance between the hammer and the roll is adjustable. A control device is provided which measures the hammer flying time and compares this time with a nominal flying time and which, in the case of a difference, displaces the hammer relative to the roll and also changes the driving force of the hammer.

REFERENCES:
patent: 3172353 (1965-03-01), Helms
patent: 3981235 (1976-09-01), Thomas et al.
patent: 4002118 (1977-01-01), Washimine
patent: 4010834 (1977-03-01), Linden
Bear et al., IBM Tech. Discl. Bulletin, vol. 5, No. 11, 4/1963, pp. 27-29.

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