Folding-shift mechanism for a bag knitting apparatus

Abstract

A folding-shift mechanism for a bag knitting apparatus which folds inward the text-printed side portion of the knitted bag automatically to enhance the structural strength on both side portions and which overcomes the problem met in previous bag knitting apparatus in which the text-printed side portions can not be folded automatically. Therefore, the folding-shift mechanism for a bag knitting apparatus enhances the structural strength and production efficiency of the knitted bag. The folding-shift mechanism is arranged between a set of upper/lower rollers and comprises a pulley stage and a rotating-and-expanding frame. A front side of the pulley stage is provided with an expanding pulley. The rotating-and-expanding frame is provided with supporting rods which extend slantingly backward in right and left directions and a folding pulley arranged on the end of each supporting rod. The folding pulleys are positioned on a diagonal of the material strip of rectangular cross-section as the material strip is passed over the rotating-and-expanding frame to shift the folding of the material strip to a new folding line coincident with the diagonal. The orientation of the material strip can be redirected after passing over the rotating-and-expanding frame.

Dependencies are inferred from the claim text.