| 摘要 |
<p>Pulses from a motor-driven roto pulser, e.g., primary pulses, and from a roto pulser powered by a moving ribbon, e.g., secondary pulses are (1) compared to determine if the ribbon is continuous and (2) used to actuate ribbon cross scoring and snapping equipment. When the secondary pulse count exceeds the primary pulse count for a given ribbon displacement by more than a predetermined amount, indications are that a ribbon break has occurred and the scoring and snapping equipment is actuated by the pulses from the ribbon powered roto pulser. When the difference between the secondary pulse count and primary pulse count is less then the predetermined amount, indications are that the ribbon is continuous and the equipment is actuated by pulses from the motor-driven roto pulser.</p> |
