Device for positioning a component receptacle unit of an automatic placement machine for printed circuit boards

摘要

The rotary positioning of a suction pipette (5) serving for receiving a component (8) takes place with the aid of an incremental encoder arrangement essentially comprising a stationary read head and a rotatable segmental disk (9) which has an incremental track (10) for measuring a traversed angle of rotation for the fine positioning and also one of two full tracks (12a, 12b) arranged in opposite quadrants (11a, 11c) of the segmental disk (9) and serving for rapid movement into an initial position of the suction pipette (5) for receiving a component (8). According to the invention, to supplement the full tracks (12a, 12b) the segmental disk (9) is in this case provided with an additional marking (13a; 13b, 13b; 13c) in order to ensure, by means of the incremental encoder arrangement, a reproducible angular orientation of the suction pipette (5) with respect to the initial position. (in this respect, FIG. 3a)