- Controlled tension on monofilament
- Simple operator interface
- High throughput
Motion Control Requirements:
- 2 Axes of coordinated motion
- Linear interpolation
- Constant torque from motor
The prime requirement of the bobbin drive is to provide a controlled tension, which means operating in Torque mode rather than Velocity mode. This requirement leads to the use of a servo operating in Torque mode even though a servo in Velocity mode might be recommended with an overriding torque limit. Therefore, the servo normally operates as a constant-torque drive, but if the filament breaks, the velocity is limited to the programmed value. The traversing arm is usually driven by a smaller servo.
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