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US 4,189,997 AGranted
Printer
AssigneeCanon Kabushiki Kaisha
InventorsMineo Nozaki, Mitsuaki Seki
Life of this patent
Estimating the term…
Abstract
A printer has a stationary electromagnet device, a hammer having a permanent magnet therein, and a resilient member coupled to the hammer. The permanent magnet may be moved upon electrical energization of the electromagnet device to cause the hammer to impact against a character by mechanical energy accumulated in the resilient member.
Claims11
A printer comprising:
- a type member including a plurality of type characters, said type member comprising a non-magnetic material;
- ink supplying means for supplying ink to said type member;
- a hammer head arranged to move against selected ones of the plurality of type characters, said hammer head consisting of non-magnetic material;
- an elastic member connected to said hammer head at one end and to a base plate at the other end, said elastic member biasing said hammer head toward a printing position;
- magnetic field producing means comprising a permanent magnet mounted in said printing hammer head to hold said hammer head at a non-printing position in such a way that the permanent magnet contacts with a magnetic material disposed at the non-printing position whereby mechanical energy is stored in said elastic member;
- and
- an electromagnetic assembly disposed at the non-printing position for producing a magnetic field opposed to the magnetic flux of said permanent magnet when selectively actuated so that the mechanical energy stored in said elastic member is released to move said hammer head in the direction towards its printing position.
4 more elements
A printer comprising:
- a type member including a plurality of type characters, said type member comprising a non-magnetic material;
- ink supplying means for supplying ink to said type member;
- a hammer head arranged to move against selected ones of the plurality of type characters, said hammer head consisting of non-magnetic material;
- an elastic member connected to said hammer head at one end and to a base plate at the other end, said elastic member biasing said hammer head toward a printing position;
- magnetic field producing means comprising a permanent magnet mounted in said printing hammer head to hold said hammer head at a non-printing position in such a way that the permanent magnet contacts with a magnetic material disposed at the non-printing position whereby mechanical energy is stored in said elastic member;
- an electromagnet assembly disposed at the non-printing position for producing a magnetic field opposed to the magnetic flux of said permanent magnet when selectively actuated so that the mechanical energy stored in said elastic member is released to move said hammer head in the direction towards its printing position;
- and
- a non-magnetic member disposed between said permanent magnet and said electromagnet assembly, whereby said electromagnet assembly is spaced from a plane defining the strongest magnetic field of said permanent magnet by the thickness of said non-magnetic member.
5 more elements
A printer comprising:
- a type member including a plurality of type characters, said type member comprising a non-magnetic material;
- ink supplying means for supplying ink to said type member;
- a hammer head arranged to move against selected ones of the plurality of type characters, said hammer head consisting of non-magnetic material;
- an elastic member connected to said hammer head at one end and to a base plate at the other end, said elastic member biasing said hammer head toward a printing position;
- magnetic field producing means comprising a permanent magnet mounted in said printing hammer head to hold said hammer head at a non-printing position in such a way that the permanent magnet contacts with a magnetic material disposed at the non-printing position whereby mechanical energy is stored in said elastic member, said magnetic field producing means emitting a magnetic flux from a first portion of said permanent magnet and absorbing the magnetic flux at a second portion of said permanent magnet to establish a first magnetic field;
- and
- an electromagnet assembly disposed at the non-printing position for producing a second magnetic field opposed to the first magnetic field of said permanent magnet when selectively actuated so that the mechanical energy stored in said elastic member is released to move said hammer head in the direction towards its printing position, said electromagnetic assembly including a magnetic member having a pair of projections and a coil wound on said magnetic member, said pair of projections being disposed opposite the first and second portions of said permanent magnet, respectively;
- and
- a non-magnetic member disposed between said permanent magnet and said electromagnet assembly whereby said electromagnet assembly is spaced from a plane defining the strongest magnetic field of said permanent magnet by the thickness of said non-magnetic member.
6 more elements
Dependencies are inferred from the claim text.