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Improved accuracy with less tension is provided with a wire feeding device when using an encoding measuring wheel to control a wire feed motor.
English (United States)
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Wire Feeding and Tensioning Device
Improved accuracy with less tension is provided with a wire feeding device
when using an encoding measuring wheel to control a wire feed motor.
Referring to the figure, wire is pulled out at point 1 through tube 2 and rotates
an encoder wheel 3 which provides output pulses for each unit of wire advanced.
These pulses are amplified and supplied to a step motor (not shown) which, by
means of a rubber-faced drive wheel 4 and pinch roll 5, pulls the wire from supply
spool 6 through an unwind tube 7 at an increment per step slightly larger than the
unit length per encoding pulse. This assures that the wire loop 8 can be
replenished with more wire than is drawn out. Wire stored in loop 8 by dancer
roll 9 is under tension controlled by tension spring 10. A flag 11 on the end of the
dancer roll support sets the motor control photosensor as the loop gets too large,
and inhibits motor drive pulses. This stabilizes the demand tension at point 1 by
allowing only small fluctuations in the dancer roll position. A "soft" coupling, such
as springs 12. is interposed between the stepper motor shaft and the drive wheel
to smooth out the wire increment per step of drive motion by the drive wheel
which would otherwise create a pulsing motion, especially at lower speeds. The
result is that "pull out" tension at point 1 is controlled by the force of spring 10.
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