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Impact matrix print head solenoid assembly

  • US 4,046,244 A
  • Filed: 08/06/1975
  • Issued: 09/06/1977
  • Est. Priority Date: 08/06/1975
  • Status: Expired due to Term
First Claim
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1. A printing head driver comprising:

  • a printing element and a magnetically responsive armature for moving such element in response to magnetic force;

    means for exerting a first force on said printing element, of a magnitude and direction to hold said element in a non-printing rest position;

    spring means for providing a force directed to move the printing element away from said rest position and toward a printing position;

    magnetic means for applying an actuating magnetic force to said armature, said actuating force when applied to said armature effectively counteracting said first force and additionally impelling the printing element toward a printing position in cooperation with said spring force, said actuating magnetic force and said spring force cooperatively having an effective combined force exceeding the magnitude of the first force by an amount greater than the magnitude of the spring force alone; and

    means for retracting the printing element from a printing position and back to said rest position upon removal of said actuating magnetic force.

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