IBM 6400-I15 Maintenance Manual - Page 39
Hammer Bank Asm, Shuttle Drive Motor
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Hammer Bank Assembly The hammer springs are grouped in comb-like assemblies mounted on a solid hammer bank. Both the number of hammer springs per hammer spring assembly and the number of hammer spring assemblies on the hammer bank vary according to printer model: ♦ 6400-004/-04P/-005/-05P/-050/-P50: seven 4-hammer assemblies, for a total of 28 hammer springs ♦ 6400-008/-08P/009/-09P: seven 7-hammer assemblies, for a total of 49 hammer springs ♦ 6400-010, -10P: six 10-hammer assemblies, for a total of 60 hammer springs ♦ 6400-012/-014: seven 13-hammer assemblies, for a total of 91 hammer springs ♦ 6400-015: six 17-hammer assemblies, for a total of 102 hammer springs Shuttle Drive Motor The shuttle drive motor is built into the shuttle assembly casting and drives two connecting rods on a crankshaft. (See Figure 11.) The small end of one connecting rod attaches to the hammer bank; the small end of the other connecting rod attaches to a counterweight frame surrounding the hammer bank. (The hammer bank and the counterweight constitute the shuttle assembly.) The rotary motion of the shuttle drive motor converts to linear and opposing motion of the hammer bank assembly and the counterweight, in an arrangement similar to that of a horizontally-opposed gasoline engine. Mechanically, this design achieves the same benefits as this type of engine: perfect primary balance, low vibration, and durability. Each hammer spring is a stiff leaf spring with a cylindrical tungsten carbide tip on the free end. (See Figure 12.) A permanent magnet is imbedded along the length of the hammer bank and acts on the hammer springs through individual pole pieces. The pole pieces magnetically attract and hold the free end of the hammer spring under tension. This is called the retracted state. Principles of Operation 39