Advancing material of indeterminate length – With adherence or attraction of material to advancing means – By pneumatic pressure
Patent
1978-12-11
1980-03-25
Christian, Leonard D.
Advancing material of indeterminate length
With adherence or attraction of material to advancing means
By pneumatic pressure
226190, B65H 1728
Patent
active
041946618
ABSTRACT:
Methods and apparatus for advancing a tape with a tape capstan rotating about an axis provide the capstan with circumferential grooves distributed across the capstan and withdraw air from each groove for attracting the tape to the capstan. The tape is guided to a first peripheral capstan region extending across the capstan and is shieleded against the withdrawal of air in each groove during such guiding to the first peripheral capstan region. The tape is attracted to the capstan by the withdrawal of air in each groove at the first peripheral capstan region and is advanced with the rotating capstan through an arc to a second peripheral capstan region extending across the capstan, while being maintained attracted to the capstan by withdrawal of air from each groove. The tape is released from the capstan at the second peripheral capstan region, is guided away from the capstan and is shielded against withdrawal of air in each groove during such guiding away from the capstan.
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DC Motors Speed Controls Servo Systems Engineering Handbook, Electro-Craft Corp. pp. 7-30 to 7-37 3rd. Edition, Oct., 1975.
Bell & Howell Company
Christian Leonard D.
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