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over again until the required length of the wire is processed. Then it activates a solenoid valve
that supplies air pressure to a pneumatic cutter. Air pressure regulator for the cutter on the back
of the system is normally set to 80 psi. The pressure can be increased for small gauge solid
conductor wires and cables. PLC also synchronizes coiling pan spinning with wire movement,
monitors pressure, interlocks and laser-scanner malfunctions. Fig.4.7. shows all major electrical
components.
Optional motorized prefeed is mounted on a separate cart on the left side of the
laser marker. It consists of the spool shaft connected to the AC motor, two pairs of wire pulleys
on a dancer shaft, top and bottom limit switches and speed regulator. When the wire starts
moving the bottom pulleys move up and the motor spins the spool faster. An excess of wire in
the loop causes the bottom pulleys to drop back down and reduces the motor speed. This
specially designed dancing mechanism coupled directly with the motor allows maintaining the
proper wire tension without jerking the wire.
Fig.4.8. Motorized Prefeed.
Prefeed
motor and
controller
Speed
Regulator
Dancer
Top
Wire
Pulleys
Motor
Shaft
Limit
Switch
Grounding clip
Bottom
Wire
Pulleys
