| 摘要 |
The invention relates to a method in a multi-colour silk-screen printer having a parality of printing stations for orientating in each of the printing stations a second pattern (7a), deriving from a pattern (6a) carried by a stencil (6) in relation to print material (7) intended to receive the second pattern, so that the second pattern (7a) will have a predetermined position in relation to the print material (7). The second pattern (7a) is formed by causing coating substance to pass, in one printing position, through the first pattern (6a) and on to the print material, for example with the aid of a squeegee arrangement. For the purpose of calibrating a control unit (8) incorporated in the silk-screen printer it is proposed; a) that the position of the material in relation to a reference value, e.g. the printer chassis, is read-off (11,12) in a first registered position (A), a material feed position, and the resultant measurement value stored; b) that the print material is moved to a second registered position, a printing position in a first printing station, in order to receive the second pattern belonging to the first printing station; c) that the print material (7) to which the second pattern (7a) has been applied in accordance with "b" above is moved back to the first registered position (A), in order to read-off the position of the printed second pattern (7a) in this registered position relative to the reference position stored in the control unit (8); and d) that the stencil frame carrying the first pattern in the first printing station is displaced in response to the established discrepancy between the actual position of the pattern, obtained when effecting the transfer according to "b" above, and its pre-determined position, to an extent and in a direction such that the established discrepancy is minimised when printing subsequent print material. t |
