Description of Linear Drive of a Pumping Member in a Media Dispenser

The present invention relates to a device for the linear drive of a pumping member in a media dispenser.Electrically operated soap and/or Foam Pump(KEXON) dispensers for hand washing are generally activated in a contactless manner by a sensor, i.e. a hand held out at a suitable distance sets a pump mechanism in action, so a portion of soap or foam is dispensed. If the hand is withdrawn prematurely or if someone wishes to “test” the action of the dispenser by passing the hand underneath quickly, the dispensed portion falls on parts of the wash basin and/or soils the floor.

This drawback has been recognised and an attempt made to eliminate it by reversing the direction of rotation of the drive motor as set forth in DE-A1-198 05 304. Here the presence of the hand to be provided with soap is monitored during the is pumping process. The necessary change in the drive and the subsequent mechanism from a forward direction to a reverse direction represents a complete reversal in the flow of energy and causes motor currents which are a multiple of the nominal current. Repeated successive actuation of the change in the direction of rotation can overheat and damage a small motor. In addition, the control circuit has to be equipped with components (transistors/thyristors, passive elements) which can process the maximum resulting high currents and are correspondingly expensive.

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