IBM 6400-I15 Maintenance Manual - Page 42
Ribbon Transport System, Ribbon Transport System
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Ribbon Transport System Left Ribbon Guide (Not Shown) Hub Locking Latch Ribbon Spool Ribbon Hub Ribbon Motors Ribbon Right Ribbon Guide Figure 14. Ribbon Transport System An inked ribbon winds and unwinds continuously on a pair of spools latched to hubs that are driven by the ribbon motors. The hubs and spools are offset vertically to equalize ribbon wear and prolong ribbon life. The ribbon motors operate only when the shuttle assembly is moving. Ribbon motion reverses when a metal strip at either end of the ribbon crosses the left or right ribbon guide, completing a circuit that causes both motors to reverse direction. Constant ribbon tension is maintained by controlling each motor with a drive or drag circuit. While the shuttle assembly is in motion, one motor acts as a drive motor, pulling the ribbon against the resistance exerted by the other motor-the drag motor. This system maintains a constant motor speed and ribbon tension. 42 Principles of Operation
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