Claims
- 1. In a print hammer for use in a hammer bank assembly which has a plurality of hammers interleaved with a plurality of spaced magnets, said hammer including a body comprising a pair of thin metal flag panels and a wire coil sandwiched between said flag panels, a pair of crossed spring wires extending from said panels, each of said spring wires being electrically connected to a different end of said coil, and a foot section through which said spring wires extend, the improvement wherein said spring wires are substantially as flexible in a direction lateral to their direction of travel when energized in said hammer bank assembly as they are in the direction of hammer travel.
- 2. The print hammer of claim 1 including a low friction coating attached to the sides of the flag panels.
- 3. The print hammer of claim 2 wherein said coating is a tape which is made of woven glass.
- 4. The print hammer of claim 1 wherein said spring wires have a substantially square cross-section.
- 5. A hammer bank assembly including a plurality of print hammers according to claims 1 or 2, said assembly comprising:
- a frame including a vertical rear portion and a horizontal portion extending forward from said rear portion;
- a plurality of printer magnets secured to said rear portion parallel to one another and spaced apart a predetermined distance;
- a plurality of print hammers whose foot sections are secured to said horizontal portion and whose bodies are interleaved with said magnets, wherein one side of each body is biased against an adjacent magnet to thereby accurately position the hammers and whereby a predetermined low amount of friction will exist between the hammers and magnets.
- 6. The print hammer of claim 1 wherein said spring wires have a substantially circular cross-section.
- 7. The print hammer of claim 6 wherein the bottom portions of said flag panels are encased in a housing of structural epoxy and said foot member is made of structural epoxy, wherein said housing and foot member are shaped so that said spring wires enter them substantially perpendicularly to thereby reduce stress on said structural epoxy.
- 8. The print hammer of claim 7 wherein the portion of the spring wires between the point where they cross and the housing is shorter than the portion of the spring wires between the point where they cross and where they enter the foot section, thereby reducing stress on said spring wires.
- 9. The print hammer of claim 8 further including at least one weight surrounding each spring wire to reduce and dampen recoil motion of said hammer.
- 10. In a print hammer including a body which includes a pair of thin metal flag panels and a wire coil sandwiched between said flag panels, a bottom section connecting the bottoms of the flags, a pair of laterally offset crossed spring wires extending from said bottom section, each of said spring wires being electrically connected to a different end of said coil, and a foot section through which said spring wires extend, the improvement wherein the portion of each spring wire between the bottom section and the foot section is substantially straight and said bottom section is shaped so that the spring wires enter said bottom section of the hammer substantially perpendicularly, thereby reducing stress on said hammer.
- 11. The print hammer of claim 10 wherein said foot section is shaped so that the spring wires enter the foot section of the hammer substantially perpendicularly.
- 12. In a print hammer including a body which includes a pair of thin metal flag panels and a wire coil sandwiched between said flag panels, a bottom section connecting the bottoms of the flags, a pair of laterally offset crossed spring wires extending from said bottom section, each of said spring wires being electrically connected to a different end of said coil, and a foot section through which said spring wires extend, the improvement wherein the portion of each spring wire between the bottom section and the foot section is substantially straight and said foot section is shaped so that the spring wires enter said foot section substantially perpendicularly, thereby reducing stress on said hammer.
- 13. A print hammer for use in a printer in which plural hammers are interleaved with and contact rigid magnets supported in a bank, comprising:
- a coil located in a flat body, whereby energization of said coil generates a magnetic field which interacts with the magnetic field of the magnets to impart a force to the body which causes the body to move and impact a printing mechanism;
- a pair of crossed wires extending from said body, said wires being attached to a foot member which is secured to the printer, wherein said wires are laterally flexible in a direction perpendicular to the plane of the body to thereby minimize friction between the hammer and a magnet when located in a bank, said print hammer further including a low friction coating located on the sides of the body to thereby further reduce friction between the hammer and a magnet.
- 14. The print hammer of claim 13 wherein said coating comprises a low friction tape.
- 15. A print hammer for use in a printer in which plural hammers are interleaved with and contact rigid mangets supported in a bank, comprising:
- a coil located in a flat body, wherein energization of said coil generates a magnetic field which interacts with the magnetic field of the magnets to impact a force to the body which causes the body to move and impact a printing mechanism;
- a pair of crossed wires extending from said body, said wires being attached to a foot member which is secured to the printer, wherein said wires are laterally flexible in a direction perpendicular to the plane of the body to thereby minimize friction between the hammer and a magnet when located in a bank wherein said wires join said body and said foot member at a substantially perpendicular angle, thereby minimizing the stress imparted to said body and said foot member during impacting, and further including:
- a pair of weights situated on the wires to damp oscillation thereof after printing impact.
Parent Case Info
This is a continuation of application Ser. No. 122,064 filed Feb. 5, 1980, now abandoned.
US Referenced Citations (7)
Continuations (1)
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Number |
Date |
Country |
Parent |
122064 |
Feb 1980 |
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