| 摘要 |
An adjusting device for parts of pneumatic tube conveyor systems which can reciprocate between mechanically fixed end positions contains an electric motor which can reverse its direction of rotation. A switching device which is controlled by the control device of the pneumatic tube conveyor system is situated in the circuit of the electric motor, the electric motor being supplied with current in accordance with the desired direction of rotation via the switching means of the said switching device, and the switching device switching off the motor current when the respective end position has been reached. The electric motor can then only be restarted with rotation in the opposite direction. In order to dispense with end position switches which are to be actuated by the part, the current consumption of the electric motor depends on the actuation. A current sensor is situated in the circuit of the electric motor, the outlet of which sensor is connected to a threshold value switch, which controls the switching means situated in the circuit at their control inlet in such a way that when the threshold value is exceeded, the current, associated with the corresponding direction of rotation, for the electric motor is disconnected and also remains disconnected until the motor is restarted with a different direction of rotation.
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