JPS6216806B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a stringer for a slide fastener by fixing a synthetic resin or metal fastener to a fastener tape passed through an injection molding machine by injection molding. Along the reinforcing edge of the fastener tape that is not inserted during molding, a focused laser beam is irradiated at a position that matches the position of the fastener molding mold of the mold to form perforations on the tape surface, and then the fastener is injection molded. This is a stringer manufacturing method in which a bridge portion is provided by passing the tape between the upper and lower leg portions of the interlocking teeth and fixing the interlocking teeth.

Conventionally, when manufacturing stringers for slide fasteners, perforations are formed in advance along the reinforcing edge of the fastener tape at positions that match the fastening spacing of the fastening teeth, and the perforated fastener tape is inserted between the molds of an injection molding machine. After matching the fastening tooth shape of the mold with the perforation position of the fastener tape, mold clamping injection molding is performed to connect the upper and lower legs of the fastener through the tape surface to ensure a strong and stable attachment of the fastener. This method is already in use, but it is necessary to adjust the amount of fastener tape fed between the molds and the tension of the fastener tape in order to match the perforation of the fastener tape with the tooth shape of the mold. However, there were problems in that it was mechanically complex and its operation was somewhat troublesome.

In order to solve the problems of the above-mentioned conventional method of introducing a fastener tape with pre-perforated holes into an injection molding machine and injection molding a fastener, the present invention aims to eliminate the formation of perforations in a fastener tape using a mold of an injection molding machine. In between, holes are made by irradiation with a focused laser beam at positions that match the fastening tooth mold, thereby forming and fixing fastening teeth uniformly and firmly, which is different from conventional perforated tape. This allows the infeed tension adjustment operation to be omitted.

The laser is directed between the open mold surfaces, deflected perpendicularly to the fastening surface of the mold, and passed through a condensing lens to focus the condensed beam on the upper or lower surface of the fastener tape surface being introduced. A perforation of a predetermined diameter is formed on the tape surface.

The focused beam is moved along the tooth arrangement of the mold to irradiate each tooth shape,
For this purpose, the laser beam is oscillated intermittently, or a shutter is installed in the beam source to release the laser beam intermittently, and the irradiation interval of the intermittent beam and the moving speed of the focused beam are adjusted to irradiate each tooth. or the laser focused beam is projected continuously,
A mask plate with transmission holes provided at positions suitable for each tooth shape is inserted into the upper surface of the fastener tape, and irradiation is performed through the transmission holes.

The above-mentioned focused beam optical system and mask plate are inserted between the molds at the time of molding, and after the drilling process is completed, they are moved outside the mold to perform mold clamping and injection molding.

The perforations formed on the fastener tape surface are formed by a focused laser beam, so
The periphery of the perforation is melted, preventing the threads and fibers of the tape from fraying, and ensuring uniform and firm fixation of the interlocking teeth.

Embodiments of the present invention will be described below with reference to the drawings.

Fig. 1 is a longitudinal cross-sectional view of the stringer S in the molded fastener part, where t is the fastener tape, c is its reinforcing edge, e is the fastener, and b connects the upper and lower legs of the fastener e. This is the bridge part.

FIG. 2 is an explanatory side view of an apparatus for implementing the present invention, and the stringer manufacturing method of the present invention will be explained in the order of steps using this apparatus.

The fastener tape t is moved by a predetermined length by a predetermined rotation of the feed rolls 1 and 2, passes through guide rolls 3, 4, and 5, and is pulled up to the fixed mold 11 of the injection molding machine 10 by the drawer rolls 6 and 7 with a constant tension. The movable mold 12 and the movable mold 12 are spread on the interlocking mold surface of the fixed mold.

In this state, the laser oscillator 20 located on the top surface of the fastener tape t on the side of the injection molding machine 10
is intermittently oscillated at predetermined time intervals or every predetermined pitch movement, and the laser beam L is projected parallel to the fastener tape t. The intermittently projected laser beam L is transmitted through a 45° reflector 21 and a condenser lens 2.
2, the focus is positioned on the upper or lower surface of the tape surface along the reinforcing edge of the fastener tape t, and the fastener tape t is moved parallel to the tape t by an external guiding movement device (not shown). Moved at a constant speed.

By correlating the projection time and projection interval of the laser beam L with the movement start position and movement speed of the focused beam optical system, it is possible to form a perforation in accordance with the position of the tooth mold of the fixed mold 11.

When one stringer S is produced by introducing one fastener tape T into an injection molding machine, the drilling process is completed by moving the focused beam optical system in one direction only in the fastener molding area, and the two fasteners are When tapes t are introduced in parallel, a hole is formed in one fastener tape t by the perforation process by moving the focused beam optical system in one direction, and then the laser beam L and the focused beam optical system are introduced into the surface of the other fastener tape t. Then, the focusing beam optical system performs a perforation process in the other direction to form perforations in the other fastener tape t. In this case, the focused beam optical system is reciprocated.

When the above-mentioned drilling process is completed, the oscillation of the laser oscillator 20 is stopped, the focused beam optical system is moved out of the injection molding machine 10, and the movable mold 12 is lowered and the mold is clamped. Tooth injection molding is performed on the reinforcing edge c of the fastener tape t, and the first
A stringer S in which a large number of fastening teeth are arranged and fixed as shown in the figure is manufactured. Thereafter, the movable mold 12 is raised and opened, and the stringer S held on the surface of the fixed mold 11 is removed from the mold by the ejector rod, and the feed rolls 1, 2,
The take-up rolls 6 and 7 are driven to rotate, and the molded stringer S is transferred to the outside of the injection molding machine 10.

Then, the following fastener tape t is fixed to the fixed mold 1.
1 and the stringer manufacturing process described above is repeated.

In the embodiments described above, the intermittent laser beam was generated by intermittent oscillation of the laser oscillator, but it is also possible to generate the continuous wave laser beam by intermittent interruption using a suitable shutter.

FIG. 3 is an explanatory side view of an apparatus for carrying out another embodiment, in which the laser beam L of the previous embodiment is oscillated by a condensing lens 22 fixed at the tip of an optical fiber flexible light guide tube 23. The laser beam from the machine 20 is guided to the fastener tape T surface, and after inserting a mask plate 30 with perforation holes arranged and drilled in the top surface of the fastener tape T at positions that match the attachment positions of the fastener tape T, the optical fiber is inserted. The drilling process is carried out by moving the tip of the flexible light guide tube 23 along the row of transmission holes in the mask plate 30 using an external guiding and moving device (not shown). After the drilling process is completed, the optical fiber is It is exactly the same as in the previous embodiment that the conductive light guide tube 23 and the mask plate 30 are removed from the injection molding machine and the mold clamping injection molding is performed to form the stringer.

FIG. 4 is a plan view of the main parts when two fastener tapes t and t are introduced into an injection molding machine and a mask plate 30 is inserted. The optical system is moved along each row of transmission holes 31 and reciprocated.

FIG. 5 is a partially cutaway plan view showing the main part of the fastener injection molding part of the fixed mold 11, in which the two fastener tapes t and t are inserted into the tape guide groove 13 recessed in the mold surface. The reinforcing edges of the fastener tapes t, t are placed on the respective fastener molds 14, and the perforations 8, 8 formed in the fastener tapes t, t are adapted to the respective fastener molds 14. 15 is an injection nozzle for synthetic resin or molten metal, 16 is a runner groove, and 17 is a gate groove. In this state, the movable mold 12 is tightly attached and clamped, and injection molding is performed, and each tooth e is set to a predetermined value. A stringer S is manufactured by fixing the reinforcing edge c of each fastener tape t at intervals as shown in FIG.

As explained above, the present invention makes it possible to uniformly and reliably make perforations at predetermined positions on the fastener tape surface introduced into an injection molding machine by focused irradiation with a laser beam. This makes it possible to efficiently manufacture stringers for slide fasteners with excellent quality.

[Brief explanation of the drawing]

Figure 1 is a longitudinal cross-sectional view of the stringer's connecting teeth.
FIG. 2 is an explanatory side view of an apparatus implementing the present invention;
FIG. 3 is an explanatory side view of a device according to another embodiment of the present invention, FIG. 4 is a plan view showing the main parts of the device in still another embodiment, and FIG. 5 is a fastener in the case of FIG. FIG. 2 is a partially cutaway plan view showing the main parts of the injection molding section. 10...Injection molding machine, 11...Fixed mold, 12
...Movable mold, 20...Laser oscillator, 21...
...Reflector, 22... Condensing lens, 23... Optical fiber flexible light guide tube, 30... Mask plate, 31...
...Transmission hole, t...Fasener tape, c...Reinforcement edge, e...Flip tooth, b...Bridge part, S...Stringer.

Claims (1)

[Claims] 1. When opening the injection molding machine 10 having a mating tooth mold, a focused laser beam is irradiated from the upper surface of the fastener tape t inserted and stopped along the mating tooth mold to a position that matches each tooth mold. A perforation is formed along the reinforcing edge c of the fastener tape t, and then the mold is closed and injection molding is performed, and a bridge portion b is provided through the tape surface between the upper and lower legs of the fastener e, and the fastener e is fixed. A method for manufacturing a stringer for a slide fastener, comprising forming a stringer S, and then moving the manufactured stringer S by opening the mold to the outside of an injection molding machine.