Print hammer actuator for dot matrix printers

Details Print hammer actuator for dot matrix printers Print hammer actuator for dot matrix printers

1975-11-13

1977-07-05

Coren, Edward M.

Printing

Selective or progressive

Bed and platen machines

197 1R, 335300, B41J 770

Patent

active

040332551

ABSTRACT:
An improved print hammer actuator for dot matrix printers employs a substantially closed loop magnetic path including a resilient magnetic hammer, a number of such hammers being aligned in a hammer bank assembly which is shuttled back and forth along a printing line at a high rate of speed, while the hammers are individually actuated by energizing coils which overcome a permanent magnetic field normally maintaining the hammers in retracted position. Heat conducting elements are mounted in heat transfer relationship with each of the different ones of the coils in the hammer bank, and high surface area fins on the elements extend into an air flow directed across one side of the hammer bank. For this purpose the hammer bank assembly is configured to define an interior air channel along its length and includes a fixed top cover and spaced apart circuit board forming part of a plenum and directing air frontwardly from a rear mounted fan. Heat generated in the coils during high duty cycle energization is effectively dissipated into the environment with substantial improvements in the uniformity of printer operation.

REFERENCES:
patent: 2528734 (1950-11-01), Brass
patent: 2947957 (1960-08-01), Spindler
patent: 3317798 (1967-05-01), Chu et al.
patent: 3541435 (1970-11-01), Davis
patent: 3659238 (1972-04-01), Griffing
patent: 3782278 (1974-01-01), Barnett et al.
patent: 3818398 (1974-06-01), Barbier et al.

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