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US 5,518,326 AGranted
Impact printer which can detect partial defects in coils
AssigneeFujitsu Limited
InventorsSatoshi Yoshino, Akihiro Abe
Life of this patent
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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.
Claims8
An impact printer comprising:
- at least one printing coil for driving a printing element;
- switching means for controlling said printing element by switching a current flowing through said printing coil;
- short circuit detection means for detecting a full short circuit defect of said printing coil;
- and
- inductance detection means for detecting whether or not said printing coil has an appropriate inductance value within a predetermined range between open circuit and full short circuit of said coil;
- and
- circuit means for actuating said inductance detection means after said short circuit detection means determine that full short circuit defects of said printing coil do not exist.
4 more elements
Dependencies are inferred from the claim text.