Device for checking feed conditions of a strip of wrapping material to a user machine.

摘要

The device (13) for checking the feed conditions of a strip (2) of wrapping material comprises a photodiode (14) and a phototransistor (15) arranged on opposite sides of the strip (2). A circuit block (16) causes the phototransistor (15) to operate in a range of proportionality between the amount of light detected and a signal supplied in output. The circuit block (16) furthermore comprises an amplifier for amplifying the output signal of the phototransistor (15) to feed a check signal to the photodiode (14) and to obtain from said photodiode (14) a signal indicating anomaly conditions in the feed of the strip (2).