IBM 6400-I15 Maintenance Manual - Page 40
Hammer Springs and Hammer Bank Detail
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Tungsten Carbide Hammer Tip NOTE: 6400-004/04P hammer bank shown. Hammer Bank Assembly: Coils, Magnet, Pole Pieces, Hammer Spring Assemblies Hammer Spring Assembly Alignment Pin Figure 12. Hammer Springs and Hammer Bank (Detail) Two electromagnetic coils are mounted behind each hammer and wound around each pole piece. The coils are normally de-energized. When hammer driver logic determines that the hammer must print a dot, a current pulse energizes the coils. The polarity of the resulting magnetic field opposes the field of the permanent magnet, canceling its effect and releasing the hammer. The hammer springs forward, strikes the ribbon and paper, and leaves a dot impression of the hammer tip on the paper. While the hammer is in flight the coil is de-energized and its field collapses. After striking the ribbon and paper, the hammer rebounds and the permanent magnet recaptures it. When the shuttle reaches the end of a sweep, it reverses direction, the paper is moved up one dot row, and the hammer springs print the next row of dots as the shuttle sweeps in the opposite direction. 40 Principles of Operation