Belt rupture detection sensor e.g. for electric motor drive belt, using transmission element for operation of switch contact system upon abnormal length variation of rupture of belt

摘要

The sensor has a movable transmission element (4), functionally coupled to the belt (2) and an electrical switch (7) with a contact system (8) which is closed when an abnormal length change or a rupture of the belt occurs. The contact system has a switching contact spring (9) having a contact surface (13) at the opposite end to that which is coupled to the transmission element and provided with 2 offset arms (11,12), clamped to the carrier (26) of the switch for cascade operation of the contact system.