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US 3,952,853 AGranted
Vertical shift mechanism
AssigneeLitton Business Systems, Inc.
InventorEdward Feldman
Life of this patent
Estimating the term…
Abstract
A pair of electromagnets, each including pole faces separated by an air gap, cooperate with a permanent bar magnet, the ends of which extend into the electromagnet air gaps. Polarization of the electromagnets causes the bar magnet to shift into four possible positions thereby shifting a coupled print head to bring one of its four type bands into printing position.
Claims7
A mechanism for shifting a print head containing a plurality of type bands into a number of operative positions comprising:
- electromagnet means comprising core means and winding means;
- said winding means being selectively coupled to a source of electrical energy for establishing a magnetic field;
- actuating means for causing variations in said magnetic field;
- a shifting element comprising magnet means in operative proximity to said magnetic means and being moved in response to said magnetic field;
- said electromagnet means comprising a pair of electromagnets each having a core including a gap region defined by a pair of separated opposed pole faces and a winding;
- said magnet means comprising a member having a first portion with an associated first magnetic polarity extending into the gap region of a first of said electromagnets and a second portion with an associated second magnetic polarity extending into the gap region of a second of said electromagnets;
- and
- a print head coupled to said shifting element;
- said shifting element being movable into any one of a plurality of positions in accordance with variations in said magnetic field;
- whereby
- said print head is correspondingly moved into any one of a plurality of positions.
8 more elements
Dependencies are inferred from the claim text.