FIBER OPTIC SAFETY AND DYNAMIC BRAKING ARRANGEMENT

摘要

The invention provides a safety arrangement for a laminating machine, the safety arrangement including a plurality of fiber optic sensors (40, 42, 44) and a dynamic braking arrangement. The fiber optic sensors are arranged to cover an entry safety zone (36) disposed prior to the nip (26) such that a standard test finger (46) of 12 mm entering the safety zone will obstruct at least one of the lights from the fiber optic sensor to cut power to the motor driving the rollers (22, 24). When power is so cut, a dynamic braking arrangement provides for rapid arrest of the motor by short-circuiting the motor coil via a relay connected across the voltage applied to the motor.