Sewing – Special machines – Elongated article
Reexamination Certificate
2000-05-24
2001-09-11
Izaguirre, Ismael (Department: 3765)
Sewing
Special machines
Elongated article
Reexamination Certificate
active
06286446
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a zipper tape stitching mechanism for the fabrication of zippers, and more particularly to a multi-needle zipper tape stitching mechanism, which fastens two chains (rows of teeth) to two zipper tapes with three parallel lines of stitches respectively.
A regular zipper, as shown in
FIGS. 1 and 2
, is generally comprised of two zipper tapes
20
′, two chains (rows of teeth)
10
′ respectively fastened to the zipper tapes
20
′ with two parallel lines of stitches
32
′ and
34
′, and two core members
14
′ respectively mounted in the chains
10
′. Because of the use of the core members in the chains, the fabrication of this structure of zipper is complicated, and its manufacturing cost is high. Further, when sliding the slide to close/open the zipper, the chains are stretched, and the lines of stitches tend to be broken.
SUMMARY OF THE INVENTION
It is one object of the present invention to provide a multi-needle zipper tape stitching mechanism, which fastens a chain (row of teeth) to a zipper tape with three parallel lines of stitches. It is another object of the present invention to provide a multi-needle zipper tape stitching mechanism, which simplifies the fabrication of zippers, and saves the manufacturing cost of zippers. According to one aspect of the present invention, a multi-needle zipper tape stitching mechanism comprises a bottom needle plate having two parallel guide grooves for the passing of two chains (rows of teeth, a guide plate with two needle holes mounted on the bottom needle plate, a guide bar for guiding two zipper tapes over the chains being delivered through the bottom needle plate, an upper needle plate covered on the bottom needle plate and defining with the bottom needle plate two zipper tape passage ways for the passing of the zipper tapes and the chains, and two stitching needles reciprocated through respective needle holes on the upper needle plate and the needle holes on the guide plate to fasten the chains to the zipper tapes with three lines of stitches respectively. According to another aspect of the present invention, the stitching needles each have three needle rods arranged in parallel and spaced from one another at a different pitch, the needle rods each having a point and an eye on the point for the insertion of a respective thread.
REFERENCES:
patent: 2858592 (1958-11-01), Schwartz
patent: 3057031 (1962-10-01), Wahl
patent: 3316870 (1967-05-01), Burbank
patent: 3685474 (1972-08-01), Frohlich et al.
patent: 3750605 (1973-08-01), Warburton et al.
patent: 3755879 (1973-09-01), Cuckson
patent: 4441438 (1984-04-01), Takahashi
Izaguirre Ismael
Rosenberg , Klein & Lee
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