Printer coil temperature sensor and method

Typewriting machines – Typing by other than type-face or type-die – Character formation by impact

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Details

4001572, 101 9303, B41J 230

Patent

active

057205612

ABSTRACT:
A line printer having a hammerbank with hammers that are held by a permanent magnet and released by electrically driven coils. The temperature of the coils is determined by the relative resistance of the coils to provide an output equivalent to the temperature of said coils. The resistance is determined as a function of the current through the coils or voltage of the coils which is converted from an analog to a digital value. The attendant method of determining temperature of the coils in the hammerbank is by comparing a pre-established current or voltage value based upon a pre-established temperature of the coil with the current passing through the coil during operation of the hammerbank. The comparison of the current passing through the coil during operation with the pre-established current is provided to a controller for controlling the printer in response to the current differential between the currents which is in turn a function of the operating temperature.

REFERENCES:
patent: 4359289 (1982-11-01), Barrus
patent: 4540295 (1985-09-01), Okunishi
patent: 4705412 (1987-11-01), Matsumoto
patent: 4724336 (1988-02-01), Ichikawa et al.
patent: 5241904 (1993-09-01), Kobayashi et al.

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