| 摘要 |
A device in which a sliding-gear nut is displaced on a threaded rod, one of these elements being driven in rotation by the motor to be controlled, the sliding-gear nut actuating a switch when it arrives at the end of its travel after a determined number of revolutions of the motor. The sliding-gear nut is integral in rotation with a second nut intended to interact with a second threaded part situated at the end of the first threaded part, of diameter greater than the diameter of the first threaded part and the pitch of the screw thread of which is substantially greater than the pitch of the screw thread of the first threaded part, with the result that when the second nut engages with the second threaded part, it is displaced more quickly than the first nut and quickly actuates the switch. This improvement enables the accuracy of the halting of the motor to be increased, independently of the size of the pitch of the first threaded part, in other words independently of the length of this threaded part, in other words independently of the size of the device.
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