PRINTER WITH SCREEN FRAME LIFT AND SQUEEGEE SUPPORT PIVOT MEANS

摘要

The master frame which supports a transversely movable squeegee assembly and a removable screen chase is coupled by blocks including slide bearings to a rearwardly upwardly inclined shafts forming one member of each support assembly fixed to opposite sides of the table top of the screen printer cabinet. This allows the master frame to be raised and lowered and simultaneously moved rearwardly to permit easy visual inspection of the platen supporting the screen print substrate. The squeegee assembly is supported for movement by yoke members carrying open sided ball bushings at 90 DEG to each other, which in turn slidably receive a pair of mounting shafts fixed to a rack bar in cantilever fashion. The rack bar, being pivoted at its ends, pivots the squeegee assembly about a horizontal axis extending parallel to the front panel of the screen printer. A drive motor fixed to the squeegee assembly mounting plate rotates a drive pinion in mesh with the rack on a side of the bar opposite to that of the horizontal ball bushing. Paired, angled male locator members are inclined 60 DEG to the horizontal, in the same manner as the guide shafts of the support assemboy for the blocks, to accurately locate the master frame relative to female locator members fixed to the top of the cabinet table. A single lifting cylinder centrally located relative to the end bars of the master frame and the support assemblies effects equal force application to both sides of the master frame maintaining horizontal alignment between the same during complete lift of the master frame from the underlying table top. Rotatable clamping members, each carrying a torque screw, effect identical registration of the removable screen printing chase with the master frame during coupling of the chase to the frame. The platen is supported on the table top, beneath the master frame, by means allowing adjustment both fore and aft and to the right or left and dial indicators indicate the extent of shift from neutral positions in either direction for insuring proper relocation of the platen after removal and subsequent replacement.