Impact printer which can detect partial defects in coils

Details Impact printer which can detect partial defects in coils Impact printer which can detect partial defects in coils

1994-12-14

1996-05-21

Burr, Edgar S.

Typewriting machines

Including selection of type-face by...

Including error detection

4001572, B41J 952

Patent

active

055183263

ABSTRACT:
An impact printer which can detect halfway defects of printing coils such as partial short circuits is disclosed. The impact printer according to the present invention includes at least one printing coil for driving a printing element and driving transistor which controls the printing element by switching a current flowed through the printing coil, and further includes an inductance detection means for detecting whether or not said printing coil has an appropriate inductance.

REFERENCES:
patent: 4706561 (1987-11-01), Greer
patent: 4819556 (1989-04-01), Abe et al.

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