3.4. DESCRIPTION OF ELECTRICAL DEVICES
The figure shows the position of the devices on the machine.
1. Gearmotor:
it activates the table rotation.
2. Gearmotor:
it activates the spool carriage movement.
3. Carriage limit microswitch:
it is activated when the spool carriage reaches the minimum and maximum wrapping height.
4. Microswitch:
it stops the downstroke if there are obstacles under the spool carriage.
5. Photocell:
it detects the height and the presence of the load to be wrapped.
6. “Load cell” sensor:
it detects the film tensioning and enables the variation of the pre-stretching roller speed.
7. Electric motor:
it powers pre-stretching rollers.
8. Sensor:
it enables the synchronised stop of the rotary table.
9. Carriage lifting sensor:
it determines the position in which the carriage must be stopped to start the processing.
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