Positioning device for a screen-printing machine

专利名称：Positioning device for a screen-printing

machine

发明人：Metso, Matti申请号：EP85850317申请日：19851009公开号：EP0187125A3公开日：19860917

专利附图：

摘要：An arrangement in a silkscreen printer for positioning a second pattern (46)deriving from a first pattern (4a) provided on a stencil (4) in relation to material (2) to beprinted while using a first memory arranged to store data relating to the desired positionof the second pattern in relation to a reference point. The material (2) on to which the

second pattern (4b) is to be printed is displaced to a printing position, in which means (5,5') are arranged to evaluate the true position of the material. In addition means areprovided for evaluating the discrepancy which would occur if the second pattern (4b)were to be applied to the material (2) in its present position. Any deviation between thetrue position and the desired position is evaluated and when a deviation is found to exista stencil-holding frame (3) and/or a printing table and/or the material is, or are, displaced,or brought in some other way to a position determined by the magnitude and directionalsense of the deviation, so that when applying the first pattern (4a) to the material (2) thetransfer pattern (4b) is printed on the material in a position in which full or satisfactorycompensation has been made for the previously established deviation. The position ofthe material can be evaluated with the aid of index marks (2') or part of a previouslyprinted pattern. The position of the material (2) and/or its pattern is, or are, evaluatedwith the aid of one or more optical scanning and sensing means (5, 5'), preferablyevaluating the position of index marks. The scanning signals (5a) obtained from theoptical scanning and sensing means (5) are fed to a first unit (34) which stores scanningsignals for each line in real time. These scanning signals are evaluated by a processor (2)which restructures the signals to a different from, these restructured signals beingstored in a second memory (35). A stencil frame (and/or material to be printed) isarranged for displacement by means of three stepping-motors or like devices, andevaluated and calculated displacement values for each of these stepping-motors areapplied thereto simultaneously and/or substantially simultaneously.

申请人：Svecia Silkscreen Maskiner AB

更多信息请下载全文后查看