Abstract: A method for manufacturing an invisible trademark zipper comprises (1) transferring a continued yard strip printed thereon with complementary halves of a pattern facing down into a weaving machine; (2) synchronizing two zipper teeth by passing the two zipper teeth through a teeth driving device, thereafter transferring the two zipper teeth together with the continued yard strip into the weaving machine; (3) sewing the two zipper teeth on predetermined positions at two sides of a longitudinal central line of the continued yard strip near the complementary halves by using two sets of needles; (4) using a cutting device to cut the continued yard strip into two symmetric pieces along the longitudinal central line of the continued yard strip; and (5) folding the two foldable fringes of the two zipper strips. The zipper teeth are engaged with each other to completely present the pattern on the two zipper strips.

Abstract: A method for manufacturing an invisible trademark zipper comprises (1) transferring a continued yard strip printed thereon with complementary halves of a pattern facing down into a weaving machine; (2) synchronizing two zipper teeth by passing the two zipper teeth through a teeth driving device, thereafter transferring the two zipper teeth together with the continued yard strip into the weaving machine; (3) sewing the two zipper teeth on predetermined positions at two sides of a longitudinal central line of the continued yard strip near the complementary halves by using two sets of needles; (4) using a cutting device to cut the continued yard strip into two symmetric pieces along the longitudinal central line of the continued yard strip; and (5) folding the two foldable fringes of the two zipper strips. The zipper teeth are engaged with each other to completely present the pattern on the two zipper strips.

Abstract: The present invention discloses a sewing needle structure for stitching a hidden nylon zipper, more particularly relates to a sewing needle structure applicable for the hidden nylon zippers of size No. 5 or above, characterized in that the sewing needle structure has at least three needles, which are parallel to each other. Those parallel needles are arranged with a gap having the smallest length within the maximum range and being evenly distributed along the interlocking teeth. The sewing needle structure having at least three needles fixes each seam between the interdigitating teeth, and the distance between the interlocking can be set to a minimum, such that the positioning of each tooth onto the tape by splicing could be more secure and reliable. Furthermore, the turnover folded edges of the two zipper tapes can be directly interlocked and securely coupled, and thereby the nylon zipper attains the hidden effect with high artistic quality.