knob is provided for adjusting the pressure of the
conical roll shaft and fitting against the wire. An ad-
justment setscrew (factory-set) aligns the grooved
roll shaft. A cam handle on the assembly, when de-
pressed, actuates a spring-cam which moves the
conical roll shaft away from the welding wire to
facilitate wire-threading.
The wire reel mounts and locks on a hub assembly
for the shoe of the drag brake. The operation of the
brake is determined by the position of the PUSH-PULL
switch, In PUSH position, the brake remains engaged
and the brake shoe drags on the brake wheel of the hub
to control overrun of wire from the reel. In PULL
position, the brake is electrically released when the
trigger switch is pulled to eliminate drag so that the
reel is free as the wire is pulled by the gun. As soon
as the trigger is released, the spring loaded brake re-
engages with the brake wheel of the hub to stop wire
pay-out.
A brake adjustment device permits the adjustment of
the degree of friction between the brake shoe and the
hub brake wheel to increase or decrease the amount
of drag and to compensate for brake wear.
Figure 13. Brake Mechanism
Figure 14. Feeder Service Connections
50
