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5.4
Setting the photocell
The machine can be equipped with a photocell that is used for packaging with a printed top film
(see Figure 5.7).
During transport of the film the top film passes a photocell that detects marks on the film.
Usually a top film packaging length is slightly shorter than the stroke length (see also
paragraph 3.2.9). The top film is stretched into register by a film brake so that the top film
always can be positioned above the package. As soon as the photocell detects the mark during
transport, the brake will be activated.
The extent of the correction is determined by the measurements taken by the photocell.
This means that the photocell needs to be appropriately adjusted.
Follow the adjusting steps below:
-
Ensure that both upper and bottom films are placed in the machine as described in
paragraph 5.3.
-
Turn the photocell on via the touch screen.
-
Loosen the star grip (see Figure 5.7) and aim the photocell at the marking across the
machine. Set the position by tightening the star grip again.
-
Calibrate the photocell see paragraph 5.5.
-
After tensioning the top film by rolling it up manually, let the machine run a few strokes,
check the position of printed top film and re-position the photocell if necessary. Re-
position to the right for braking later, or to the left for braking earlier.
-
Machine is ready for run.
photocell
star
grip
film roll
film brake
housing
Figure 5.7 Setting the photocell
