JPS6044127B2 - Method and apparatus for producing a fastener chain with extruded elements - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for manufacturing a fastener chain having elements formed by extrusion.

A method of forming an extruded element by rotating a die wheel having an element-shaped cavity on its outer periphery and extruding molten synthetic resin into the cavity using an extruder is already known (for example, U.S. Pat. No. 3,196,196)
).

Since the continuous elements formed by the conventional method are simply connected to each other with strings, etc., it is necessary to attach the chain-like elements to the fastener tape after forming by sewing with a sewing machine or by weaving. It was hot. Since the two-step process of forming the element and attaching the element is required, not only does the manufacturing time become longer and the cost increase, but it is also difficult to obtain a slide fastener with stable quality. The present invention solves the above-mentioned drawbacks, and has an extruded element that directly attaches the extruded element to the fastener tape, eliminating the need for a subsequent attachment process, simplifying the process, and producing a high-quality product. An object of the present invention is to provide a method and apparatus for manufacturing a zipper chain. Embodiments of the present invention will be described below based on the drawings.

Reference numeral 1 denotes a die wheel, in which element-shaped cavities 2 are formed at regular intervals over the entire circumference, and grooves 3 are formed over the entire circumference so as to connect the cavities 2.

An extruder nozzle 4 is arranged above the die wheel 1. The tip of the nozzle 4 is slidably fitted into a groove 5 formed on the outer periphery of the die wheel 1, as shown in FIG. A slit 7 (see FIG. 4) communicating with the widthwise center of the passage 6 is formed in the nozzle 4 in the longitudinal direction, and a guide groove 8 is provided in the slit 7 so as to pass through the passage 6. A tape guide 9 is fitted and fixed. The lower end of the tape guide 9 is located at the nozzle hole 10 at the lower end of the passage 6, and the opening B at the lower end of the guide groove 8
a communicates with the cavity 12 and the groove 3. 11
is a mandrel, which extends below the nozzle 4 along the vicinity of the bottom of the groove 3 of the die wheel 1.

The fastener tape 12 is provided with a core string 13 at the edge,
In addition, through holes 14 are formed at equal intervals along the core string 13. The fastener tape 12 passes through the slit 7 of the nozzle 4 and the guide groove 8, and the core string 13 is arranged along the upper surface of the mandrel 11, and is moved to the first and second left by the front and rear feed rollers 15, 16. is sent continuously to
At the same time, the goo wheel 1 is also rotated at the same speed as the tape 12 in the direction of the arrow. Then, the molten synthetic resin is continuously supplied to the nozzle 4 from the screw of the extruder, and is extruded into the cavity 2 facing the nozzle opening 10, so that the cavity 2 is filled with the molten metal 20 as shown in FIG. is attached to the core string 13 and the tape 12, and enters the through hole 14 of the tape 12 to form a bridge 17 that connects the side walls of the element to each other. In this manner, the molten metal is continuously extruded into the cavity 2, and after passing through the nozzle nozzle 10, the molten metal is cooled and solidified, and then die-cut near the front of the nozzle 4.

The completed element 18 has a cavity 19 at the location of the mandrel 11 and has a structure in which it is strongly adhered to the tape via the bridge 17. As described above, according to the method and apparatus of the present invention, the extruded elements are directly attached to the tape, so the zipper chain is completed in one step, and the subsequent attachment process is not required, so the manufacturing time of the zipper chain is significantly reduced. Not only is the manufacturing cost reduced, but the resulting product also has the effect of providing a high-quality fastener chain with high element mounting strength and no irregularities in element rows.

[Brief explanation of the drawing]

Fig. 1 is a side view showing an embodiment of the device of the present invention, Fig. 2 is a longitudinal sectional side view of the main parts of the same, Fig. 3 is an enlarged sectional view taken along the line ■-■ in Fig. 2, and Fig. 4 is a nozzle portion. 5 is a side view of the completed element, and FIG. 6 is a front view of the same. 1... Die wheel, 2... Cavity, 3... Groove, 4... Nozzle, 8...
...Guide groove, 8a...Opening, 9...Tape guide, 10...Nozzle opening, 12...
...Tape, 13... Core string, 14...
Through hole, 18...element.

Claims (1)

[Claims] 1. A die wheel having element-shaped cavities arranged at equal intervals on the outer periphery and grooves connecting the cavities is continuously rotated, and a die wheel is provided with a core string and through holes arranged at equal pitches along each core string. The tape is arranged so that the core string and the through hole pass through the cavity, and the tape is conveyed at a constant speed with the die wheel, and the molten metal is continuously extruded from the nozzle of the extruder into the cavity to form the element. 1. A method for producing a fastener chain having an extruded element, characterized in that it is attached to a tape. 2. A die wheel equipped with cavities in the shape of elements arranged at equal intervals on the outer periphery and grooves connecting the cavities, an extruder nozzle equipped with a nozzle opening that runs along the grooves of the die wheel and communicates with the cavities, and a nozzle with a lower end opening. 1. A fastener chain manufacturing apparatus having an extruded element, comprising a tape guide having a guide groove and a tape guide attached to the inside of the nozzle so that the opening extends along the groove.