Fromm FS380, Use And Maintenance Manual, Page: 37 / 100

Fromm
31
MACHINE DESCRIPTION
31
A
6
A A
5
4
1
7
5
4
1
7
8
3
2
8
3
2
Clockwise plate rotation Anti-clockwise plate
rotation
With this carriage version, the application tension of the fi lm on the pallet.
This carriage can pre-stretch the fi lm according to fi xed ratios determined by
interchangeable gears.
The pre-stretch ratios are:
- 150% (1 metre of film is pre-stretched to a length of 2.5 metres);
- 200% (1 metre of film is pre-stretched to a length of 3.0 metres);
- 250% (1 metre of film is pre-stretched to a length of 3.5 metres);
- 300% (1 metre of film is pre-stretched to a length of 4.0 metres).
The carriage is fi tted with a sensor (4) , connected to the outlet roller, which
measures the tension of the fi lm applied to the pallet.
A specifi c electronic card integrates the signal of the sensor
(4) with the
adjustment set with setting F13-16 (F32) functions in the control panel in
order to dynamically control the speed of the pre-stretch roller drive motor
and thus the fi lm tension.
The carriage is fi tted with a gearmotor which drives three rubber-surfaced
rollers (1) and (2) by means of toothed gearing. The diff erent transmission
ratios generate diff erent speeds of the rollers (1) and (2) creating the pre-
stretch action. The carriage also features a set of idle rollers which are used
to increase the winding angle of the fi lm on the rubber-coated rollers.
Upon starting, the fi lm must be loaded onto the carriage.
• Put the carriage into the Down position to make fitting the roll
easier.
• Push the roll (7) onto the centre pin (8) .
• Open the door and insert the film between the rollers following
the path indicated in figure (A) , the symbol with the triangles
identifies the side of the film to which the bonding agent (if
present) is applied.
• Diagram (A) is also attached to the carriage.
To facilitate insertion between the rollers, we recommend squeezing the
strip of fi lm into the shape of a rope.
When the reel is in, thread the fi lm behind the fi rst idle roller
(3) and pull it
out at least 50 cm. Thread the rope between the rollers (1) and (2) at the top
of the carriage (at the height of the reduced roller pin) and push it inwards
until it comes out behind roller (2) ; when it extends far enough out to be
gripped, simply pull it outwards and arrange it along the last stretch of its
route, around the dancer (4) and behind the last idle roller (5) .
Now, and in this order, use one hand to press the dispenser button (6) and
your other hand to pull the fi lm.
Picture 18