Sheet-material associating – Reciprocating-carriage piler – With tension indicator or control
Patent
1995-09-20
1998-01-06
Kwon, John T.
Sheet-material associating
Reciprocating-carriage piler
With tension indicator or control
270 3004, 2424203, 242557, B65H 2946
Patent
active
057046034
ABSTRACT:
In a cloth spreading machine having a motor-driven cradle for holding a roll of cloth and feeding cloth from the roll onto a supporting surface along which the machine travels, a first signal is provided which is proportional to the speed of travel of the machine, a second signal is provided which is proportional to the rate of feed of cloth from the roll, and a control responsive to the first and second signals provides a signal for controlling the speed of the cradle motor so that the rate of feed of cloth from the roll is substantially equal to the speed of travel of the machine along the surface. Sudden changes in tension on the cloth due to acceleration or deceleration of the machine cause movements in a dancer bar which are converted by a transducer to an input to the control for causing a relatively rapid compensating increase or decrease in the speed of the cradle motor. The first and second signals are provided by tachometers associated with the machine and cradle motors, respectively, and the control includes a circuit having one control loop with the dancer bar transducer being in another loop of the control circuit. The circuit also includes a component for providing a fine adjustment in tension on the cloth during feed. The knife box or folding blades of the cloth spreading machine includes a one-piece cloth guide which accommodates raising and lowering of the box or blades in a manner interfacing with flow of cloth along the guide.
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Nalecz Andrew A.
Yetman Robert M.
Eastman Machine Company
Kwon John T.
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