Parts and Functions
Rovema VPK Operators Manual
3/2000 VPK REV(B) PANELVIEW 600
3-45
Optional Equipment
Automatic Film Tracking Sensors
The automatic film tracking sensors keep the edges of the vertical
seal aligned. There are two optical sensors; one positioned just inside
of the film web (inner sensor) and one positioned just outside of the
film web (outer sensor). If the film web drifts to the right and the inner
sensor becomes unblocked, the bagmaker moves the film carriage
towards the left until the sensor is blocked again. If the film web drifts
to the left and the outer sensor becomes block
ed
, the bagmaker
moves
the film carriage towards the right until the sensor is
unblocked again.
Figure 3.43
Shows the automatic film tracking sensors.
Inner and Outer
Optical Sensors