Theory of Operations
Rovema VPK Operators Manual
3/2000 VPK REV(B) PANELVIEW 600
4-7
Film Registration
The registration sensor allows the bagmaker to use registered film.
Registered film is designed to be sealed at specific locations. To
accomplish this, the bagmaker must identify these locations and time
the sealing jaws to land on them. The locations are identified by marks
printed along the edge of the film web (registration marks). When the
JOG/RUN push-button is pressed, the bagmaker advance the film
web until it detects one of these marks. Then, it moves the sealing
jaws into the fully open position. Once the film has been registered
and the sealing jaws have been homed, the bagmaker starts the
forming cycle. During the cycle, it advances the film and times the
sealing jaws to land on it after the bag length has been feed. When
this sealing location is not the desired sealing location, the PHOTOEYE
CORRECTION switch (on the photoeye screen) can make the bagmaker
advance more film to change the sealing location.
When there are other markings on the film that can be mistaken as
registration marks, the PHOTOEYE WINDOW switch (on the photoeye
screen) can prevent the bagmaker from detecting these markings. It
allows the markings to pass the registration sensor before allowing the
bagmaker to examining the signal from the sensor.
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