Machine Setup Procedures
Rovema VPK Operators Manual
3/2000 VPK REV(B) PANELVIEW 600
6-11
Setting the Film Tension
Proper film tension prevents slack from forming in the film web. When
the film web losses tension, the film moves away form the registration
sensor or shifts around the forming collar. Before setting the film
tension, you must setup the dancer assembly to produce nominal film
tension.
To setup the dancer assembly to produce nominal film tension:
1.
Push the dancer arms to the bottom of the film carriage.
2.
Adjust the upper spring tensioner so that it just touches the top of
the upper spring.
3.
Pull the dancer arms to the top of the film carriage.
4.
Adjust the lower spring tensioner so that it just touches the bottom
of the lower spring.
The setup above will produce nominal film tension. From this point,
the film tension should be set high enough to prevent slack from forming
in the film web yet as low as possible to reduce the strain on the film
feeding device.
To increase the film tension, turn both spring tensioners so that they
compress the springs. To decrease the film tension, turn both spring
tensioners so that they relieve pressure on the springs.
Figure 6.11
Shows the dancer assembly.
Dancer Arm
Upper Spring
Tensioner
Lower Spring
Tensioner