| 摘要 |
The invention relates to rack and pinion lifts, which include a lift car which is driven via toothed wheels by means of an electromotor along a rack carried by a lift mast, said car containing a control and maneuver unit for the electric motor with a control and maneuver button set including floor call buttons, landing based call button units being connected to said control and maneuver unit via a ground level unit from which also a power cable leads to the lift car. In association with the lift car a sensor device is arranged to indicate passage of teeth of the rack or the toothed wheel and produce corresponding position impulses, which represent the position of the lift car. A micro computer system is connected for receiving the position impulses and for collecting and storing call impulses from the call units and destination impulses from the button set of the control and maneuver unit, and based upon the position of the lift car ordering travel direction, retardation and stop of the lift car. Said micro computer system includes on the one hand a programmable micro computer unit in the lift car with a register for position impulse numbers corresponding to the positions of the landings, inputs for landings and outputs for controlling operation of the electric motor, on the other hand a micro computer unit scanning the call button units with respect to their state and associated with the ground level unit and communicating with the programmable micro computer unit in the lift car.
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