Intelligent servo-controlled fiber placement machine tensioner

Details Intelligent servo-controlled fiber placement machine tensioner Intelligent servo-controlled fiber placement machine tensioner

1991-05-24

1993-06-29

Simmons, David A.

Adhesive bonding and miscellaneous chemical manufacture

Surface bonding means and/or assembly means therefor

Automatic and/or material-triggered control

156425, 156433, 156523, 156574, 242 7544, 242 7551, B65H 5900

Patent

active

052230724

ABSTRACT:
To maintain tension on a fiber tow as it travels between a spool of the tow and a fiber placement head in a computer controlled fiber placement machine, closed tension loop servo control tow velocity feed forward is provided to control spool rotation so as to not only provide closed loop tension control but to also cause rotation in anticipation of expected tow movement such as due to tow payout upon commanded movements of the fiber placement head. Gain scheduling based on spool radius is also provided. Additionally, a compliant roller is provided to reduce tension dips and spikes from disturbances on the tow, and an inner velocity loop is included with the closed tension loop to provide more effective control of tow tension. The servo control is reconfigurable into an open or pseudo-closed loop mode with a safety low power supply to slowly reel-up slack tow after tow threading, for example, and to otherwise maintain low tension on the tow to hold it in the machine while allowing servicing thereof. A broken tow test is also provided to detect tow slippage indicative of tow breakage or a possible part defect.

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