Device for temperature control of a print head or of a hammer bl

Details Device for temperature control of a print head or of a hammer bl Device for temperature control of a print head or of a hammer bl

1990-04-27

1991-08-27

Eickholt, Eugene H.

Printing

Selective or progressive

Bed and platen machines

101 9305, 400719, 400124, 318471, B41J 300

Patent

active

050423754

ABSTRACT:
A switching signal, either for the switching off of the print head (20), or for a lowering of the operating frequency, or for a switching-on/switching-off control of a blower motor, is employed in connection with an installation of a temperature surveillance of a print head (20) or of a hammer block based on an electromagnetic coil construction. In order to achieve a more precise, a quicker and a more individual measurement determination, the electromagnetic coil (3), coordinated to each print element (1), is in each case switched during a current-passing pause to a primary constant current source generating a voltage (U.sub.p). A coil voltage drop (U.sub.s) at the electromagnetic coil (3) generates a reference signal (26) at the comparator (27) setting the temperature limit. The reference voltage (U.sub.ref) is received as a binary logic signal in an intermediate data memory storage (30). The logic signal serves as a control signal for effecting a temperature limiting or a temperature lowering in the print head (20).

REFERENCES:
patent: 4496824 (1985-01-01), Kawai et al.
patent: 4639650 (1987-01-01), Nakai
patent: 4776712 (1988-10-01), Okuno et al.
patent: 4834562 (1989-05-01), Shikanai et al.
patent: 4842431 (1989-06-01), Katsukawa

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