B - Operations – Transporting – 41 – J
Patent
B - Operations, Transporting
41
J
101/94
B41J 9/00 (2006.01) B41J 9/36 (2006.01)
Patent
CA 1225875
LONG RELEASE COIL HAMMER ACTUATING MECHANISM Abstract of the Disclosure An actuating mechanism comprising a magnetic circuit formed by a permanent magnet (43), a flux plate (45), a return plate (47), a post (49), and a long release coil (51) is disclosed. The flux and return plates (45 and 47) lie in parallel planes located on opposite sides (poles) of the permanent magnet (43) and extend outwardly therefrom in the same direction. The post (49) is mounted on the end of the flux plate (45) and the release coil (51) is mounted on the post. The outer end of the release coil (51) terminates slightly short of the tip of the post. Further, the post (49), long coil (51), flux plate (45) and return plate (47) are sized and positioned such that the tip of the post (49) lies coplanar with the outer surface of the return plate (47) and such that the end of the return plate(47) terminates just short of the release coil (51). The fixed end of a cantilever- mounted hammer (53) is attached to the outer surface of the return plate in (47)alignment with the permanent magnet (43). The head (59) of the hammer (53) is positioned to be attracted to the post tip and the adjacent area of the return plate (47) by the magnetic flux created by the permanent magnet (43) when the long release coil (51) is not energized. The permanent magnet attraction force bends the head (59) of the hammer (53) across the small gap resulting in the hammer (53) being stressed, i.e., cocked. When the long release coil (51) is energized, it produces a magnetic field that counteracts the permanent magnet attraction force, releasing the cocked hammer. Release of the cocked hammer impacts a ball (61), welded to the side of the hammer (53) remote from the pole tip, against a ribbon to create a dot on a print-receiving medium. Because the release coil (51) terminates just short of the tip of the post (49), the intensity of the flux produced by the coil (51) at the interface between the post tip and thehammerhead (59) is high. As a result, for the same amount of applied coil current, the amount of drag force created by the permanent magnet (43) after the hammer (53) is released is lower than it would be if the release coil (51) were spaced a substantially greater distance from the tip of the post (49).
464581
Mannesmann Tally Corporation
Smart & Biggar
LandOfFree
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