| 摘要 |
Ribbon feed control apparatus includes a rotatable supply roll on which a supply of ribbon to be dispensed is placed, a rotatable take-up roll on which the ribbon is collected after being used in printing, a mechanism for driving the take-up roll in one direction for pulling the ribbon from the supply roll, a device for determining the amount of ribbon required for a printing operation, a device for measuring the amount of ribbon used in such an operation, a device for comparing the amount of ribbon required with that actually used, and for terminating operation of the take-up roll driving mechanism when the amount required and the amount used are equal, tension sensing mechanism for determining when the ribbon becomes slack while it is being driven between the supply roll and the take-up roll, driving mechanism controlled by the tension sensing mechanism for driving the supply roll in a direction opposite to the direction in which the take-up roll is driven in order to take up the slack in the ribbon, and delay mechanism operable to keep the supply roll drive mechanism from operating until after the take-up roll driving mechanism has completed its operation.
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