Advancing material of indeterminate length – With means to retard material movement
Patent
1980-10-07
1982-07-27
McCarthy, Edward J.
Advancing material of indeterminate length
With means to retard material movement
242 755, 242 7553, B65H 2308, B65H 5900
Patent
active
043413358
ABSTRACT:
Method and apparatus for controlling tension in a longitudinally moving web between fixed material feeding points while maintaining the length of the path of web movement between said fixed points substantially constant. Two axially fixed, web-feeding rollers are positively driven from a common drive motor. One roller is driven at a variable speed through a shaft-mounted transmission unit having a variable pitch pulley spaced from the axis of rotation of the roller shaft and connected to the motor by a flexible belt. Fluid piston means provides a constant force on the transmission unit in a direction about the roller shaft axis to impose a constant torque on the variable speed roller and to move the variable pitch pulley to increase or decrease the speed of the roller, thereby maintaining a constant imposed tension on the material in its path of movement between the two rollers.
In a further embodiment, web tension variations upstream of the two feed rollers is controlled by an upstream displaceable roller which moves in response to upstream tension variations in the web to move the transmission unit about the feed roller shaft axis and vary the speed of the feed roller to maintain a substantially constant total tension on the web in its path of movement between the two feed rollers.
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Manning, Jr,. Wellington M.
McCarthy Edward J.
Sistig Corporation
Wilburn, Jr. Luke J.
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