JPS5922658B2 - Molding equipment for synthetic resin fixed length slide fasteners - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a molding device for a fixed length slide fastener made of synthetic resin. In the conventional manufacturing of a fixed length slide fastener made of synthetic resin, the following method is known.

In other words, 1) A long slide fastener is molded using an injection molding machine, and the fastening teeth are removed at regular intervals (standard length) in a post-process (separate equipment). 2) Gold of the same length as the standard slide fastener is molded. After molding with an injection molding machine using a mold, a fixed length fastener having the same length as the mold is manufactured by taking off the fixed length plus the length of the gap or winding it up.

However, these known methods have the following drawbacks. In other words, in method 1), a) the fastening teeth are removed in a post-process, which increases the number of man-hours required to manufacture one fastener, resulting in high costs; (2) The process becomes very complicated and expensive. (2) The tape part from which the fasteners have been removed is severely damaged and the product value decreases. (2) The process becomes very complicated and expensive. (b) It takes a long time to change the mold, which increases the number of man-hours and is expensive. (b) It is necessary to prepare many molds for each fixed-length fastener. d) The capacity of molding machines will increase and the equipment will become larger.

The present invention eliminates these shortcomings in conventionally known fixed-length slide fastener manufacturing methods, reduces molding time and manufacturing time, and simplifies the manufacturing process, equipment, and mechanism. The object of the present invention is to obtain a molding device for a fixed length slide fastener made of synthetic resin, which can mold a better product with higher precision.

Hereinafter, the present invention will be described with reference to Nos. 1 to 5 of the accompanying drawings showing embodiments thereof.
This will be explained based on the diagram.

First, as shown in Figure 1, 1 and 1 are opposed molds in which a series of cavities are formed, 2 and γ are mold mounting plates for each mold 1 and V, and 3 is an already molded leading molding. In addition, adjacent to the side of the leading molding tooth row 3 of the mold 1, V, that is, the rear end tooth row of the leading molding tooth row 3 is shown adjacent to the mold side on the feeding device side. A positioning device 5 for determining the pitch between the teeth and the leading tooth of the next forming tooth row 4 and for connecting (connecting) the forming fasteners is attached to the forming disks 2, 2'.

This positioning device generally has a prong with a tooth-shaped groove, and uses the mold closing process during molding to fit the final tooth near the mold of the molded fastener into the tooth-shaped groove. Rarely position. A block having a tooth-shaped groove is arranged near the mold with the tooth pitch dimension. A trigram,
The leading molded tooth row 3 and the next molded tooth row 4 are connected by a tape 6. In addition, the tension device 7
is inserted to apply a constant tension to the tape 6. Further, after molding, there is a feeding device 9 for grasping and feeding the preformed tooth row 3 by the clamping device 8, but the clamping device 8 is stopped in the middle of the feeding path of the clamping device 8. A stopper 10 is provided for this purpose. This stopper 10 is operated by a signal from a preset counter 11. In this embodiment, a cylinder is used as the feeding device 9, but winding by an electric motor may also be used.Also, the stopper 10 is not limited to a cylinder as shown in the figure, but may also be a solenoid. It can also be operated by etc. Next, FIG. 2 shows the structure of one of the molds 1 according to the present invention, in which a runner cap 1 is provided longitudinally in the center.
2 is a sealing pin 13 for sealing the resin filling.
The seal pin 13 is movable so that the length t of the molded fastener can be determined by the position of the seal pin 13.

As shown in FIGS. 2 and 3, this seal pin 13 is fixed to a guide block 14 at the end of the mold 1 so that its position can be adjusted steplessly, and the seal pin 13 is rotated by the guide block 14. is possible, but axial movement is prevented and the adjustment nut 1
5 and engages the screw formed in the rear half of the seal pin 13, and by rotating this adjustment nut 15, the protrusion length of the seal pin 13 into the runner cavity 12 is adjusted. The seal pin 13 may be embedded and fixed within the runner cavity 12 depending on the molded length. Further, in FIGS. 4 and 5 showing a part of the fastener during molding, 16 is a fitting tooth, 17 is a runner, 18 is a spool, 19 is a gate, and 6 is the aforementioned table.

The molding is spool 18, runner 17, gate 19.
, and the fitting teeth 16 are formed in the order shown in FIG. 1 and 2, t is the length of one molded product, t is the length of the molded product, and t is the length of the molded product.
The feed length is determined by the setting position of g, and g indicates the unformed spacing between fixed-length fasteners. In this case, the feed device 9 and the stopper 10 can each be moved in the same direction as the movement direction of the product, and therefore the distance g can also be adjusted. The apparatus according to the present invention has the above-mentioned configuration, and the overall operation and operation thereof will now be explained based on FIG. 1 as follows.

1. First, the molding length t1 is set by the seal pin 13, and the number of molding times is set by the preset counter 11, respectively.

In this case, the feed length l and the forming length t are almost the same length, but the molded product shrinks after forming, so strictly speaking, the feed length l
is slightly smaller than the forming length t. Molded products (
The length of the fastener 1) is the product of the molding length t by the set value of the preset counter, and when molding a molded product (fastener 1), the molding length t is positioned and continuous.
Further, at both ends of the molded product (fastener), there are portions that are only tapes without interlocking teeth, and this is the force forming interval g. Therefore, the feed length l and the interval G between the tape sections are also set. In this manner, when the various parts are set, the VC is removed and molding begins. 2. Synthetic resin is injected into the molds 1 and 1, which have been closed, using an injection cylinder. After the injection, the mold is opened after a period of holding pressure and cooling. Therefore, the molded product is released from the mold 1.

3. The clamping device 8 is activated and when the operation is completed,
The feeding device 9 operates.

At this time, the stopper 10 moves forward and the clamp device 8 is moved to t'.
Stop at the position shown in the figure. This is due to the above 1. As mentioned above, since the fastener 1 shrinks slightly after molding, the molding length t in the mold and the feed length T7 are slightly different.

Therefore, the feed length l is a length that takes into account shrinkage. 4. The mold starts closing again, and at the same time the positioning device 5 operates to perform pitch alignment, and then the steps 3 and 4 above are repeated the number of times set by the preset counter 11 to form a continuous fastener.

5. When the preset counter 11 counts out the number of set moldings, a signal is issued, the stopper 10 is moved backward,
The feed device 9 retreats to the position l+8, returns to the position g, and resets the preset counter 11.

By repeating the steps 2 to 5 above, a fixed-length slide fastener of t x (set value of the preset counter 11) is formed, and g is formed between the fixed-length fasteners.
These repetitions result in a tape spacing of length
Continuous fixed length fasteners are produced. Since the present invention has the above-described configuration and operation, various excellent effects as described below can be obtained. That is, 1. This eliminates the need for post-processing (self-operated tooth removal device → or mold replacement, etc.), which was considered necessary with conventional methods, so manufacturing time is shortened.
2. The manufacturing price will be very low. Even for various fixed-length fasteners, only one set of molds is required, including the seal pin, feed cylinder, stopper, etc., so there is no need to change the molds, and only one set of molds is required. Therefore, the size of the mold should be constant and the equipment should not increase in size 3. 4. A fixed-length fastener of infinite length can be obtained by simply adjusting the seal pin.4. Since the product is completed at the same time as the molding, a high-quality product can be obtained without causing severe damage to the tape in the removed area due to the removal of the interlocking teeth, as is the case with conventional methods.5. 6. The mechanism is extremely simple and can be easily fully automated, so it is easy to operate, and at the same time, maintenance and inspection are easy. A long fastener, which could be formed only by the conventional fastening tooth removal method, can be easily obtained.

[Brief explanation of drawings]

FIG. 1 is a schematic overall layout diagram showing one embodiment of the device of the present invention;
Figure 2 is a plan view of one of the molds, and Figure 3 is the − of Figure 2.
4 is a plan view of a part of the fastener, and FIG. 5 is a view taken along the line V-V in FIG. 4. 1, 1'...Mold: 2, 2'...Mold mounting plate: 3...Previous molding tooth row: 4...
・Next forming tooth row: 5...Positioning device; 6.
...Tape; 7...Tension device: 8...
... Clamp device; 9 ... Feeding device: 10.
... Stop device; 11 ... Preset counter; 12 ... Runner capacity: 13 ...
... Seal pin; 14 ... Guide block; 1
5... Adjustment nut; 16... Fitting tooth; 1
7...Runner;18...Spool;1
9...Gate; t...Molding length: t'
...Feed length; g...Unformed interval.

Claims (1)

[Scope of Claims] 1. A pair of molds each having a series of cavities formed therein, a seal bottle that can be embedded in a runner cavity of one of the molds, and a mold that is molded by these molds. A clamping device for clamping the molded fastener, a feeding device for feeding the clamping device by a fixed length, and a feeding device for feeding the clamping device by a predetermined length. A synthetic resin fixing device characterized in that it is composed of a stopper for turning and stopping at a position and a positioning device for inserting and positioning the final terminal tooth of a molded fastener adjacent to the mold into the terminal groove of the molded fastener. Forming equipment for long slide fasteners. 2. The molding apparatus according to claim 1, wherein the seal bin is movably mounted in the runner cavity of one of the molds.