Patent ID: 7047879
Filing Date: 2006-05-23
Classification: B41F

Abstract:
1. A cantilever type screen-printing machine with double platforms comprising a base, an elevating mechanism, a transverse sliding assembly, a chase clamping mechanism, a main printing mechanism, and a double-platform mechanism; the transverse sliding assembly is lifted vertically by the elevating mechanism and the chase clamping mechanism that vertically moves with the transverse sliding assembly synchronously are connected with the right and the left cantilever arms of the transverse sliding assembly; while the main printing mechanism on the transverse sliding assembly slides rightward and leftward to process printing; the double-platform mechanism having an upper platform and a lower platform which are loaded with print materials and slide under the main printing mechanism respectively for processing printing; wherein the elevating mechanism includes right and left aluminum rectangular columns, each with a set of linear sliding rails which is connected with a connection board that is joined with the transverse sliding assembly on inner side respectively; a gear reducer motor with a hollow shaft is fixed under the two aluminum rectangular columns for rotating a screw of a precision threaded screw unit, thus driving a corresponding threaded rod to move vertically without rotation inside the hollow shaft; while the top of the threaded rod is connected with the connection board by a top block so as to drive the transverse sliding assembly synchronously; the transverse sliding assembly having an aluminum extrusion transverse column with linear slide rails on inner side thereof to make the main printing mechanism slide back and forth along the linear slide rails; an active belt pulley driven by a motor and a passive belt pulley are arranged on left and right ends of the inner side of the transverse column for driving the main printing mechanism transversely; the chase clamping mechanism having a rectangular frame and two sets of chase clamps; the right and left sides of the rectangular frame are fastened under right and left cantilever arms respectively while the two sets of chase clamping device are fixed transversely on top of the rectangular frame by fastening units at front and rear ends thereof; the chase clamping device having a fixed lever, a holding plate, and a plurality of clamping pneumatic cylinder for holding the chase; on both ends of the fixed lever, where connected with the rectangular frame, a vertical micro adjuster is installed for micro-adjustment that includes a forward piece and a backward piece, both attached with a washer plate which includes a plurality of assembling screws and one fastening screw; by a plurality of anti-loose assembling nuts and an anti-loose fastening nut, the washer plate is fastened on the fixed lever; holes on the fixed lever for assembling screws and fastening screw are vertical long narrow hole so that the forward and the backward piece adjust in proper position vertically; a horizontal adjusting bolt and a washer are arranged in the surface of the forward and the backward piece and are fixed on top of the fixed lever through a hole in the forward and the backward piece; the washer screwed on the horizontal adjusting bolt to cover on the hole prevents the screwed horizontal adjusting bolt from loosening off; by rotating the horizontal adjusting bolt, the fixed lever shifts vertically thus micro-adjusting the distance between the fixed lever and the rectangular frame; the double-platform mechanism includes a right and a left runner tracks, an upper and a lower platforms, a homocentric coaxial shaft, and two gear reducer motors while the right and the left runner tracks fixed on the right and the left sides of the base and a supporting sliding track as well as a gear sliding belt with different altitude are accommodated therein; the right and the left sides of the upper and the lower platforms are connected with the gear sliding belts by the sliding connection bars and slide forward and backward along the supporting sliding track; the homocentric coaxial shaft having an inner shaft fitted in an outer shaft is arranged transversely on the rear portion of the right and the left runner track while outer and inner bearings are fixed at both ends of the outer shaft and the inner shaft for supporting; on two sides of the outer shaft and far beyond the inner shaft, two passive belt pulleys powered and driven by the respective gear reducer motor are set there respectively; the outer shaft and the inner shaft rotate are driven by the two gear reducer motors respectively so that the inner and the outer shafts can rotate in various modes such as both shafts runs simultaneously in the reverse rotate direction, or in the same rotate direction, or different rotate speed for the inner and outer shafts respectively, or only one shaft rotates, thus the upper and lower platforms shift back and forth reciprocally, or simultaneously, or single platform shifting for different requirements of printing.