Universal Scheu Company L60 - Manual (Page 9)

Page 9
FUNCTION OF UNWIND ASSEMBLY
The unwind is simple, but important to the operation of the L-60 machine. When the
motor starts, the web and labels are pulled through the machine by the drive roller.
The label stock pulls on the brake arm, releasing the brake, and allows the roll of
labels to unwind. When the motor stops, the brake arm returns to the rest position.
This movement tightens the brake band around the 3" diameter main unwind hub
and the roll of labels stops unwinding.
The L-60 has a fixed speed, AC drive motor that transmits power to the drive roller.
The AC drive is directly influenced by the load it is trying to pull. In this case, the load
is the tension of the brake arm spring and the weight of the roll of labels. The brake
arm spring shown below in Fig # 4, should be fastened to the unwind assembly
mounting bar in the tapped hole which provides the least amount of tension at the
brake arm. (The hole closest to the hub.)
If the L-60 is dispensing a long label (10" for example), you may have to increase
the tension on the brake arm spring (Move spring attachment point to lower hole -
See Fig # 4) to keep the brake arm from bottoming out.
The length and speed figures mentioned above are only examples. Your observation
of the unwind operation will be the best indication of when a tension change may be
needed.
Dancer Arm
Spring located in top
hole. Move to bottom
hole for larger labels.
Fig 4