Patent ID: 6729231
Filing Date: 2004-05-04
Classification: B41F

Abstract:
A workpiece carrier positioning structure used in an auto printing and drying machine for controlling positioning of a workpiece carrier fixedly carried on a carriage sliding in a track, for enabling said workpiece carrier to be positively maintained in a printing/drying position, the workpiece carrier positioning structure comprising:a roller pivoted to the center of a bottom side of said workpiece carrier; a rack fixedly provided in said carriage and adapted to support said workpiece carrier on said carriage, said rack having pairs of upright lugs symmetrically disposed at two opposite lateral sides thereof; a plurality of axles connected in parallel between the upright lugs at the two opposite lateral sides of said rack; a plurality of locating blocks fixedly provided at said bottom side of said workpiece carrier and respectively coupled to said axles for enabling said workpiece carrier to be moved transversely between the upright lugs at the two opposite lateral sides of said rack; a plurality of compression springs respectively mounted on said axles and bilaterally supported between said upright lugs and said locating blocks to keep said workpiece carrier in balance; an air cylinder two parallel guide rails arranged adjacent to said air cylinder; a slide mounted on said guide rails; said air cylinder adapted to reciprocate said slide along said guide rails and a stop block fixedly provided at a top side of said slide, said stop block having a V-notch disposed in one side thereof and adapted to receive said roller to hold said workpiece carrier in said printing/drying position.