Importance

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Abstract

A process chart recorder for the on-line recording of process measurement data that has a dot-printing head. In order to develop a chart recorder arrangement having a dot-printing head of the generic type to the extent that the overall printing operation can be effected more easily using mechanically or electromechanically simple means, the printing actuation of the dot-printing head and the actuation of the pen wheel is effected through a common stepping motor. The stepping motor is provided with mechanical means through which the stepping motor is coupled to the pen wheel in a manner causing rotation in one direction and blocking rotation in the opposite direction, with the result that, in one direction of rotation of the stepping motor, only the pen wheel can be actuated and, in the other direction of rotation, the entire dot-printing head can be lowered for printing.

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First Claim