Importance

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Abstract

A metering pump with a rotary drive motor and an oscillating piston, wherein the rotary motion of a drive motor is transformed into an oscillatory motion of a connecting rod by means of a gear arrangement, so that a displacement means activated thereby executes an oscillating linear motion on continuous rotation of the drive motor, that results in transfer of a medium to be metered in a metering head (12) arranged in the longitudinal axis of the connecting rod (19) cooperating alternately with an outlet and inlet valve to produce a pump stroke (pressure stroke) and a priming stroke. A reference element (35) is associated with the connecting rod, the position of which is detected by a positional sensor, wherein the positional sensor provides an actual signal (x.sub.I) that is in a fixed relationship to the position of the reference element and thus to that of the displacement means and that provides information regarding the motion executed by the displacement means, so that the electronic control system of the metering pump can react to the conditions of the metering circuit and pump.

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First Claim