Cassette for strain recorder

Details Cassette for strain recorder Cassette for strain recorder

G - Physics

11

B

242/31.3

G11B 5/00 (2006.01) G01D 13/26 (2006.01)

Patent

CA 1211093

ABSTRACT A cassette for a scratch strain recorder has a rotatable supply bobbin geared directly to a rotatable take-up bobbin so that rotation of the take-up bobbin will be equal in amount but opposite in direction to that of the supply bobbin. The recording tape is formed of a roll of flat resilient material which has one end attached to the supply bobbin and which, in the unused condition, is almost totally wound around the supply bobbin except for the other end which is attached to the take-up bobbin. The tape is driven by a capstan and pinch roller, the capstan being arranged for driving connection to a drive shaft of the strain recorder itself. Because of its inherent resilience the coil tries to straighten, i.e. unwind, and this assists rotation of the two bobbins when the capstan is operated and the direct gear inter- connection causes an equalization of the spring forces between the two bobbins as the cassette progresses from an unused condition to a nearly completely used condition.

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