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Control Of Rebound Energy In A Coil Actuated Hammer Disclosure Number: IPCOM000066689D
Original Publication Date: 1979-Apr-01
Included in the Prior Art Database: 2005-Feb-20

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Arnold, RW Helinski, EF Zable, JL [+details]


The hammer mechanism of Fig. 1 comprises a striking bar 10 attached to a flat coil 11 which rotates about pivot 12 within a magnetic field formed by magnets 13. When operated, bar 10 strikes print medium 14 against a platen or raised helical surface 15 on a rotating drum 16, and then rebounds to make contact with a resilient backstop 17. In order to minimize settle-out time in such a print hammer, it is desirable to remove most of the kinetic energy still contained in the hammer during rebound. The rebound energy should be removed some time before the hammer makes contact with the backstop 17.