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Experimental analyses of low noise driving mechanisms for pulse motors used for paper transport and cutter mechanisms in facsimile machines are presented in two parts. The first study focuses on the noise generation mechanism from one-way clutch gear used for torque transmission switching between document paper transport mechanisms and a recording paper cutter, called “chattering noise.” Unexpected movement of the clutch due to internal friction and subsequent collisions of the gears is found to be the cause for this type of noise. The chattering noise is controlled with a spring-friction damper placed between two clutch gears. The second study focuses on the noise generation mechanism observed for particular pulse intervals when the pulse motor for recording paper transport is driven with a double pulse train. It is found to be the rotational oscillation resonance noise from the pulse motors, and it can be controlled using proper double pulse combination timing.

Low noise drive methods for pulse motors in facsimile machines.