Electricity: motive power systems – With particular motor-driven load device – Tension-maintaining type of motor-control system
Patent
1989-09-18
1990-07-31
Ro, Bentsu
Electricity: motive power systems
With particular motor-driven load device
Tension-maintaining type of motor-control system
318 6, 318 12, 318 15, 318618, B65H 5938
Patent
active
049452932
ABSTRACT:
To control the draw exerted on a web which is being fed to the rolls of a web processing machine, a strain wave gear power transmission device has its power input shaft driven by the main drive shaft of the machine and its output shaft coupled to the rolls including the nip rolls of the machine which draw the web. The wave generator (W.G.) shaft of the device is driven continuously in a single direction and at a higher rotational speed relative to the power input shaft. Encoders provide concurrent pulses at rates indicative of the main shaft and W.G. shaft speeds. The ratio of the pulse ratio is determined and compared to a stored value which corresponds to percent of draw desired. Any resulting error signal is used to change the speed of the W.G. shaft and output shaft. High encoder pulse rates provide for resolving small speed and draw errors. The output shaft of the transmission drives groups of rolls of the machine by way of a plurality of belt drive systems.
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patent: 4525655 (1985-06-01), Walker
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Leanna Glen B.
Wittkopf Eugene W.
Integrated Design Corp.
Ro Bentsu
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