192 clutches and power-stop control – Clutches – Automatic
Patent
1979-07-27
1981-05-26
Staab, Lawrence J.
192 clutches and power-stop control
Clutches
Automatic
74 69, 192 89A, 192101, F16D 1106, F16D 4302
Patent
active
042692920
ABSTRACT:
A lost-motion drive mechanism is provided which is particularly, although not exclusively, adapted for use as a high speed transport for an X-ray film, or the like, in an X-ray camera. The drive mechanism includes an input shaft for coupling a drive motor to the drive shaft of the transport. Actuators are interposed between the input shaft and the drive shaft. As the input shaft is driven through one complete revolution (360.degree.) by the drive motor, the actuators cause the drive shaft to turn with an angular velocity which rises gradually from zero to a maximum for the first 180.degree. of rotation of the input shaft, and then with an angular velocity which decreases gradually from a maximum to zero for the next 180.degree. of rotation of the input shaft. The assembly of the invention overcomes inertia problems which are encountered, for example, in X-ray cameras when relatively large X-ray films (105 mm, for example) are used; and for providing a high speed transport for such films (for example, 44 milliseconds from one frame to another), without any danger of shock or breakage to the film or to the drive elements of the transports. The lost motion is achieved by two actuators which rotate about intersecting orbits on a 1:1 ratio. A unique self-tightening clutch is provided which is controlled to permit one rotation of the drive shaft each time the mechanism is activated.
REFERENCES:
patent: 1595124 (1926-08-01), Simmons
patent: 1741439 (1929-12-01), Seybold
patent: 2224192 (1940-12-01), Madsen
patent: 2756854 (1956-07-01), Brenholts
patent: 2915160 (1959-12-01), Schneider
patent: 2924317 (1960-02-01), Holstein
patent: 3295381 (1967-01-01), Czarnecki
patent: 3530731 (1970-09-01), Koch et al.
patent: 4023422 (1977-05-01), Jou et al.
Beecher Keith D.
Scentex Corporation
Staab Lawrence J.
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