JPS5923266B2 - Continuous molding positioning device for synthetic resin slide fasteners - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Conventionally, when continuously molding a zipper chain, a pre-formed chain is formed by a set of molds having a series of cavities to a certain length, and this mold The next molding secretary row of a certain length must be molded in succession with an accurate pitch.

For this purpose, the following methods and devices are used. In other words, (1) a mechanism is provided to move one movable mold at right angles to the opening/closing movement of the mold, and after or during mold opening, the movable metal fitting is moved while the molded product is fixed, and the molded product is moved. After ejecting, the movable mold is returned to its original position. (2) In protruding the molded product and feeding it a certain length, the molding protrusion provided on the rear end secretary or runner of the leading pre-formed secretary row is inserted into the groove or At the same time as the mold is clamped, it is inserted vertically into the hole using the pressing force.

(3) When feeding the molded product, it is fed beyond a certain molding length, and during the mold closing process, it is reversed and the rear end of the previous pre-formed secretarial row is scraped. The next secretarial row is molded by applying it to the end face of the movable mold.

However, this method has the following drawbacks.

(In method C, the weight of the mold is very heavy, so the moving speed cannot be set very fast, and the moving mold must return to its original position accurately in order to perform the next molding.) This increases the molding cycle or molding time and reduces production capacity.Also, the mold movement mechanism becomes complicated and large, increasing its cost.In method (2), the final positioning of the molding secretary row is performed by clamping the mold. At the same time, it is done with that pressing force.

Therefore, clamping the mold requires a larger clamping force than necessary. Furthermore, the movement of the tape due to its positioning and the generation of clamping force when closing the mold cause variations in the tension and elongation of the tape within the mold, making it impossible to produce a stable product. In addition, since the tape is moved for positioning until the mold clamping is completed, the runner is unstable in fitting into the groove or hole, and the tape cannot be checked in a stationary state.

Furthermore, if the amount of tape feeding is not accurate, guide parts such as interlocking teeth will be crushed by mold clamping.

Moreover, since there is no ability to correct the position, even if pitch deviation occurs, it cannot be confirmed.

In method (3), the device for reversing is complicated, and since only a pair of fasteners are brought into contact with the end face of the mold, the shock caused by the sudden stop may deform and damage the fasteners. It will not be possible to produce the product, and it will also damage the end face of the mold. The device of the present invention was developed in an attempt to eliminate all of the numerous drawbacks of these conventional devices.

This will be explained with reference to the diagram. 1 is a connecting tooth, which passes through the spool 2, runner 3, and gate 4 to the mold 7,
7' to form the tape 5.

6 is a molding protrusion formed on the opposite side of the spool 2. As shown in FIG. A clamping device 9 that clamps the tooth row 8 and a feeding device 36 that feeds it every fixed length are provided.

The positioning device a shown in FIGS. 5 to 9 will be explained.

A pressing plate 1 is mounted on a pedestal 10 attached to one mold 7'.
014, 14' through which the pins 12, 12' connected to 1 are inserted through springs 13, 13' are cams attached to the base 10, and have inclined surfaces at their tips.

Correspondingly, a bracket 15 is attached to the other mold 7, and guide pins 16, 1 are attached to this bracket 15.
6 is provided, and a block 17 and a guide plate 18 are inserted therein.

19 is a connecting pin that connects the block 17 and the guide block 20.
Concatenate.

22 is a spring installed between the guide block 20 and the guide plate 18, and 21 is a spring installed between the block 17 and the bracket 15.

A roller 23 is provided on each end surface of the block 17 and the guide plate 18.
23, 23, 23 are attached, and between each roller 23, 23, the tip of the cam 14, 14' provided on the pedestal 10 having an inclined surface can be freely inserted.

Guide grooves 24 and 25 for guiding the molded protrusion 6 are bored in the upper and lower edges of the central portion of the guide plate 18, and a guide groove 26 corresponding to the guide groove 25 is provided in the guide block 20 in a protruding manner. ing.

27 and 28 are stoppers fixed to the block 17, as shown in FIGS. match.

In other embodiments shown in FIGS. 13 to 16,
The guide plate 18' and guide block 20', which correspond to the guide plate 18 and guide block 20 of the above embodiment, are slid in the vertical direction in FIG.
6 is made to correspond to the guide grooves 25' and 26' by sliding in the left and right direction as shown in FIG.
It is designed to correspond to

For this purpose, a spring 22' is interposed between the guide plate 18' and the guide block 2σ, and each roller 23', 2 is provided on the outer surface of the spring 22'.
3' by engaging the cams 14, 14' with the guide plate 1.
8' and guide block 2σ are opened and closed.

34 is a stopper bolt for the guide plate 18' and the guide block 20'.

The guide grooves 25' and 26' have the same radius as the molded projection 6.
Furthermore, the tangents on both sides of R are cut at an angle of θ=135 to 150 as shown in FIG.

The operation of the positioning device a shown in FIGS. 5 to 9 will be explained based on FIGS. 10 to 12.

After forming the tooth row 8 of a certain length, the molds 7, 7' are opened, and at the same time the cams 14, 14' pressing plate 11 retreats, and the guide plate 18 and guide block 20 are moved by the spring 22. At the same time, the guide grooves 25 and 26 are also opened. (1st
(Fig. 0) Then, the molded product is ejected by a post-feeding device 36 (Fig. 4) to feed a roughly constant length.Next, the molds 7, 7' begin to close, and as the mold r moves, this The pressing plate 11 attached to the runner also moves in the mold closing direction, and the molding protrusion 6 provided on the runner 3 is pushed into the open guide grooves 25 and 26, as shown in FIG. 〇The mold closing progresses further, and the rollers 23, 23 are pushed open by the inclined surfaces at the tips of the cams 14, 14', and as a result, the guide plate 18 is pushed down, and the block 17 is pushed up. The integral guide block 20 is pushed up, thereby pushing the molded projection 6 into the guide groove 25, 26.
Upon correcting the movement to the correct position, it is fixed between both guide grooves 25 and 26 to complete the positioning (see Fig. 12). At this time, the upper molded protrusion 6 is placed in the upper guide groove of the guide plate 18. 24 so that the runner 3 is completely parallel to the mold closing surface.

Then, the mold closing progresses further, and when the mold clamping is completed, the next molding is performed.

Such operations continue.

As described above, in this embodiment, the forming protrusion 6 is corrected and positioned in the flow direction of the runner 3, that is, in the vertical direction thereof, but in other embodiments shown in FIGS. 13 to 16, The molded protrusion 6 is attached to the runner 3
At right angles to the flow direction, i.e. in the left and right direction,
The guide plate 18' and the guide block 20' are moved and positioned between the guide grooves 25' and 26'.

Since the guide grooves 25' and 26' have the same diameter R as the molded protrusion 6, and the tangents on both sides are further cut at an angle of θ, the molded protrusion 6 pushed in during this time is well corrected and positioned. The positioning is performed in the correct position. As can be seen from the above description, the present invention requires only a rough feed stroke, and then the device itself automatically performs corrective positioning, so it is extremely easy to set up, and its operation is reliable. Since the positioning is done before the mold clamping is completed, the stationary table can be reliably fitted into the tape groove in the mold, and this can be confirmed, resulting in high quality with high pitch accuracy. It can be manufactured.

In addition, although the corrective positioning uses the mold clamping action of the mold, it does not utilize the mold clamping force itself, but is performed by the operation of a device separate from the mold that moves as the mold moves. Therefore, no clamping force is applied to the molded product itself that performs positioning, so there is no damage to the molded product at all, and the corrective positioning force can be adjusted in any way. .

Since the mechanism is simple, the device can be made compact and easy to maintain, and since its operation is extremely simple, the molding time can be shortened.

It can also be easily installed on any general-purpose injection molding machine.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the fastener, Fig. 2 is a vertical cross-sectional side view taken along the line A-A in Fig. 1, Fig. 3 is a cross-sectional side view taken along the line B-B, and Fig. 4 is a cross-sectional side view taken along the line B-B.
The figure is a schematic front view of this device, FIG. 5 is a plan view of this device, FIG. 6 is a longitudinal cross-sectional side view taken along line C-C in FIG. 5, and FIG. 7 is also a D
- A side view as seen from line D, Fig. 8 is a plan view of the opening stroke adjustment stopper, and Fig. 9 is a cross-sectional side view taken along line F-F.
Figures 10 to 12 are longitudinal side views showing the operation, with Figure 10 showing the beginning of the operation, Figure 11 showing the middle of the operation, and Figure 12 showing the completion of the operation. be. 13 to 16 show other embodiments, FIG. 13 is a plan view thereof, and FIG. 14 is a G
15 is a plan view of a portion of the guide groove that has undergone corrected positioning, and FIG. 16 is a plan view illustrating its operating state. 1...Makuto, 3...
...Runner 6...Molding protrusion, 7,7'・
... Mold, 8 ... Service tooth row, 10 ...
...Pedestal, 11...Press plate, 14,14'...
...Cam, 15...Bracket, 18...
...Guidance board, 20...Guidance block, 22
, 22'... spring, 23... roller,
25, 26... Guide groove.

Claims (1)

[Scope of Claims] 1. A pedestal is attached to the end face of one of the two molds for molding a tooth row of a fixed length, and a pressing plate is provided on this pedestal in the direction of clamping the mold. and cams are arranged in parallel with each other, a bracket is attached to the other mold, and a guide plate and a guide block are provided on this bracket so that the two correspond to each other by engagement of the cam and can be opened and closed, In addition, a continuous molding positioning device for a slide fastener made of synthetic resin is provided, in which guide grooves for sandwiching and fixing molded protrusions formed on the runner are bored on the end faces of the front walls of the guide plate and the guide block. 2. Continuous molding of a synthetic resin slide fastener according to claim 1, in which a guide plate and a guide block are arranged side by side via a spring, and rollers are provided on both outsides thereof, and a cam is engaged with the rollers. Positioning device.