Flat-bed screen printing machine for printing of electric circuit boards

摘要

A flat-bed screen printing machine is described for the printing of electric circuit boards which are provided with an electrically conducting layer and are to be printed with two print images. In order to move the printing table plate (23) which is arranged on the printing table, a control arrangement (43, 45, 47) is provided, the latter having electronic cameras (13a, 13b) which, after a circuit board (20) has been placed on the printing table plate (23), record the actual position of reference marks (41, 51) on the circuit boards (20). The control device (43, 45, 47) then compares the actual position of the reference marks (41, 51) with a previously determined and stored desired position, in which both print images are aligned with each other, and derives from the comparison a control signal which triggers stepped motors (25a, 25b, 25c) and guides the printing table plate (23) on the carriage (24) until the actual position of the reference marks (41, 51) on the circuit board (20) agrees with the previously determined desired position. <IMAGE>