DEVICE FOR TESTING OF FOIL USED FOR AUTOMATIC PAPER WEB SPLICING IN HIGH SPEED PRINTING MACHINE

摘要

A device for testing of foils used for automatic paper web splicing in a high speed printing machine. The device includes a sensor adapted to sense the foil and generate an electrical signal, a relay connected to the sensor and adapted to receive the electrical signal therefrom, and an indicator assembly for generating at least an audio and/or a visual signal upon the foil being sensed. The device also includes a power supply coupled to the indicator assembly through the relay and the sensor. The relay includes an electromagnet, an armature and at least one normally open contact terminal. The foil is sensed by the sensor based on an intrinsic property. Upon the foil being sensed, the electrical signal generated by the sensor is provided to the relay to energize the electromagnet for closing the normally open contact terminal. Consequently, the indicator assembly generates the audio and/or the visual indication.