Parts and Functions
Rovema VPK Operators Manual
3/2000 VPK REV(B) PANELVIEW 600
3-4
Film Carriage
Dancer Assembly
The dancer assembly maintains tension on the film web. It includes
one fixed roller and a dancer arm assembly. When film is threaded
through the bagmaker, a film loop forms between the fixed roller and
the arm rollers. As film is pulled out of the film carriage during bag
forming, the film loop pulls the dancer arms upward and tensions the
arm springs. The tensioned springs cause the dancer arm assembly
to push downward on the film loop. This prevents any slack from
forming in the loop.
Note:
Slack in the film web causes film registration and film tracking
problems.
Figure 3.3
Shows the dancer assembly.
Dancer Arm
Arm Springs
Arm Rollers
Film Loop
Fixed Roller