Device and method for positioning a substrate to be printed
First Claim
1. A screen printing device comprising:
- a print table for disposing a substrate thereon;
a photoelectric element to detect an actual disposition of the substrate on the print table and which generates adjustment signals;
a screen; and
an illumination element which illuminates a first side of the screen;
wherein the screen is adjustable with respect to the print table and the substrate in response to the adjustment signals,the photoelectric element detects light diffusely reflected from the first side of the screen and evaluates the diffusely reflected light with regard to the actual disposition of an edge of the substrate and derives therefrom the adjustment signals and the screen is adjusted based on the adjustment signals, and the edge of the substrate is indirectly illuminated by the light diffused by the first side of the screen.
2 Assignments
0 Petitions
Accused Products
Abstract
The disclosure relates to a device and a method for positioning a substrate to be printed in accordance with a screen printing method, lying on a print table, with respect to a template of a screen of the screen printing device. After placement and fixing of the substrate on the print table, and with the screen arranged close to the print position, the side of the screen towards the print table is illuminated from the print table and at least one predetermined edge section of the substrate is photoelectrically detected from the print table. After evaluation of the detection signals, the screen is adjusted into its desired disposition with respect to the actual disposition of the substrate, and then the printing is effected.
27 Citations
16 Claims
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1. A screen printing device comprising:
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a print table for disposing a substrate thereon; a photoelectric element to detect an actual disposition of the substrate on the print table and which generates adjustment signals; a screen; and an illumination element which illuminates a first side of the screen; wherein the screen is adjustable with respect to the print table and the substrate in response to the adjustment signals, the photoelectric element detects light diffusely reflected from the first side of the screen and evaluates the diffusely reflected light with regard to the actual disposition of an edge of the substrate and derives therefrom the adjustment signals and the screen is adjusted based on the adjustment signals, and the edge of the substrate is indirectly illuminated by the light diffused by the first side of the screen. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of positioning a substrate on a print table with respect to a print template screen comprising the steps of:
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placing and fixing the substrate on the print table; positioning the print template screen at a first distance from the substrate; lowering the print template screen to a second, closer distance from the substrate; illuminating a first side of the print template screen which is facing the print table; detecting the actual disposition of a predetermined edge section of the substrate with a photoelectric element which receives diffusely reflected light from the first side of the print template screen in the region of the predetermined edge of the substrate; adjusting the position of the screen with respect to the substrate and with regard to the desired position; and bringing the print template screen into contact with the substrate for printing. - View Dependent Claims (14, 15, 16)
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Specification