Screen-printing machine
AssigneeU.S. Philips Corporation
InventorAlain Sorel
Life of this patent
Estimating the term…
Abstract
The machine is used, for example, in the production of printed circuits. The frame (5) supporting the screen cloth (3) is moved in a plane which always remains approximately parallel to the plane of the circuit (2) to be printed, and the machine is equipped, in each corner of the frame, with a tracer (9) which detects an exact height of the cloth (3) and which commands independently in each corner the stopping of the means (7, 8, 10, 17) for the lowering of the frame, so as to establish a reference height, on the basis of which fine adjustments can subsequently be programmed.
Claims19
A screen-printing machine for printing a plane article, comprising mounting means for supporting the article;
- a screen cloth;
- a frame supporting the screen cloth;
- means for moving the frame between a loading/unloading position spaced from the article for the loading/unloading of the article and a working position, in which the cloth is disposed adjacent to the article;
- a doctor movable above the screen cloth in the working position;
- means for moving the frame toward and away from the article in a plane approximately parallel to the plane of the article, said means for moving the frame comprising a plurality of raising/lowering mechanisms coupled to the frame;
- means for sensing a predetermined position of the screen cloth, said means for sensing height comprising a plurality of detectors, each arranged opposite the screen cloth in the vicinity of one of said raising/lowering mechanisms;
- and
- means for enabling each of said detectors to command the stopping of the adjacent mechanism when the screen cloth has descended to the desired height.
A machine according to claims 11 through 16, comprising a direct-current motor with a coder for actuating each of the raising/lowering means.
Dependencies are inferred from the claim text.