JPS60240411A - Molding equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thread, groove, notch or hole formed in whole or in part by a core consisting of longitudinal segments disposed about a longitudinally extending core bin. The present invention relates to actively expanding and contracting cores for use in molding plastic products having internal surfaces containing or other undertone shapes.

Certain adjacent segments abut within the mold cavity and form a continuous mold surface due to the corresponding inner wall surface of the molded part. These contact segments are moved radially inward to remove the core from the molded part. For example, as described in U.S. Pat. No. 3,660,001, an l-type core in which adjacent contact segments retract radially inward such that they are removable requires that the segments flex. subject to this restriction. For example, U.S. Pat. No. 3,3.39.242 or 3.482.81
No. 5 or No. 3,584, . No. 111 or No. 4.13
Other cores in which adjacent segments contract radially inward, as described in the 0.264 patent, require a complex system for guiding and/or effecting radial inward movement of successive core segments. The need for a sliding structure limits cost and operation.

OBJECTS OF THE INVENTION It is an object of the invention to provide a radially inwardly retractable core in which successive segments are pivotally connected for rocking motion without superimposing deflection conditions on the original limitations, and in which the segments The purpose is to make the installation and operation of the device simple, economical and reliable.

Another object of the invention is to provide a core that can be contracted inwardly;
Here, adjacent segments are mounted for rocking movement between two positions by means of a movable actuator pin, the actuator pin holding the segment in the forming position.

And before moving the adjacent segment to another position, the holding is first released and then the movement to the other position is initiated.

Yet another object of the present invention is to provide an inwardly retractable core as described above, wherein the actuator bin has independent camming surfaces for swinging each segment in two directions; Moreover, these surfaces are separated so that when the actuator is moved in a direction opposite to the previous movement, there is a delay in the reverse swinging of the mold segment. This ensures that there is room for movement of the segments and actuator turbines.

In the illustrations of the preferred embodiments, similar parts are numbered -1;t; (q).

FIG. 1 shows an embodiment of the present invention for molding a plastic product.

It has a convoluted flange-like part with an internally threaded neck, in this case off-center, defining an opening through the flange. The mold is shown in the closed position. The type is.

It consists of a lower mold part 1 and an upper mold part 3 which can be vertically separated by a separation line 5. The lower mold part has a lower plate 7.

On this lower plate rests a core assembly comprising segments mounted in a support sleeve 9, which in this figure rests on the lower retaining plate ll, which is screwed to the upper plate 13. Consists of half a split ring held together in Omukai. The plate 13 forms part of the mold cavity 15. In this example, 12 core segments are provided, of which every other six
7 have the same shape. The outer circumferential surfaces of these core segments are narrower than the outer circumferential surfaces of the intervening segments 19, which are all the same in this example. The segments are assembled about a common longitudinal axis 21 around a ring 21a that fits within the oversized grooves of the segments. Each segment has a semi-circular pivot projection 23 centered at 25 and is respectively supported within a semi-circular surface 27 of the sleeve 9. In the molding position of FIG. 1, the surface 29 of the segment abuts a cylindrical hole 29 in sleeve 90 and a similar cylindrical hole 9' in &13, both of which are oriented about axis 21. Each segment abuts its neighbor within the mold cavity. The threaded portion 31 of each segment is.

Each adjacent segment is continuous and forms a core surface forming a continuous helical thread.

In this case, the threads are at least 360 mm on the inner surface of the molded product.
It extends across 0. This is just one example, where shrinkage of the core allows for longitudinal movement of one relative to the other to separate the core from the molded product.
Just one example. The surface 33 in each segment when in the molding position of FIG. Allow it to swing to the release position shown in the figure. The sleeve 90 surface 33' is
It has a radially outward heave from the arched surface 27 towards the lower end 9 of the sleeve 9.

Each segment is moved twice by an actuator capable of reciprocating between the molding position of FIG. 1 and the release position of FIG.
oscillates between two positions. The actuator consists of an upper and a lower actuator bin 35 or 37;
These actuator pins are aligned along the axis 21.

The bottle 35 is attached to a holder 39 held within the upper mold part 3. In this case the holder is placed in the mold cavity 1
It forms part of 5. This bottle 35 is.

It has an actuator cam with an upper taber cam surface 41, which cam surface is supported on a corresponding follower cam surface 43 of the corresponding segment, so that the segment swings into the forming position of FIG. , and retained here.

Due to the downward closing movement of the upper mold part when moving to this position, the bottom of the upper pin 35 pushes the cylindrical lower part of the lower bottle up to the rest position in the direction of the pillar 59', compressing the cover spring 45. do.

After the end of each molding operation, the upper mold part 3 is lifted from the lower part l and the bottle 35 is lifted. This relieves the force of surface 41 on the segment,
The lower pin 37 is then released and follows the bottle 35 upwards by the force of the spring 450. The bin 37 has an actuator cam surface 47 such that the follower cam portions of the segments 17 that are spaced apart from each other cause each segment 17 to pivot about its own vibond axis 25 . The upper ends of these six segments move inwardly towards axis 21;

This is made possible by the continuous raising of the surface 41 of the bin 35.

If for any reason the raising of the cam 47 tends to cause any segment to swing "faster" than would be possible with the retraction of the bin 35, that segment
Temporarily halt any further rise in 7. Bin 35 is
It leaves Bin 37 and continues to rise independently. This rise causes the cam surface 41 to rise, thereby resuming the upward movement of the bin 35.

The segment can again swing. The actuator pin and the swingable segment do not stick together during normal operation.

'In the 111th position the bottoms of the six segments 19 are separated from the cam surface 47 as indicated at 51.

Hence the beginning of the release swing in these segments.

There is a delay until cam surface 47 has risen sufficiently to close space 51. The upper part of the segment 17 has then already moved inward, creating a space for starting the inward movement of the upper part of the segment 19. Continuous upward movement of bin 37 causes the tops of segments 17 and 19 to continuously move radially inward. The upward movement of the bin 37 is stopped by a rod 55 attached to the bin 37, which rod has a head 57 restricted in movement in a hole in the bottom of the column 59 carrying the support sleeve 9.

In this tool, the inward movement of the mold part of segment) 17 is more than twice the movement of the corresponding end of segment) 19.

The mold part 3 continues to move away from the mold part 1, at least sufficiently to enable ejection of the molded product by a conventional ejector mechanism.

The mold can be closed again as usual to repeat the molding process. This involves lowering the mold part 3 into the position shown in FIG.

The stem 59 of the bottle 35 has a smaller diameter than the opening formed by the upper end of the segment in the released position. When lowered, the stem 59 reaches the top of the bin 37.

At this time, there is a small space 53 (FIG. 3) between the conical surface 41 and the segment surface 430. If the bin 35 is lowered further, the bin 37 will correspondingly lower. A surface 47 for the lower end of the segment 17 that may therefore be present
The holding pressure of is removed so that these lower ends are free to swing into the molding position. During the continuous lowering of bin 35, 41 and 43 are in contact, swinging all segments into the molding position of FIG. Bin 37 is pushed downwards, thereby causing movement of the segment bottom towards axis 21 and bin 3
7 interference is prevented. Differences in the rocking motion of different segments are obtained by segment differences. A particularly circular arrangement of bins 35-37 for any particular segment is not required.

Figures 5, 6 and 7 show a variant embodiment of the invention as used in a single bottle core to form a plastic closure, in this case having an internally threaded neck. . Figure 5 is.

A cross section corresponding to that taken along line 1-1 in FIG. 2 is shown. Here, like the tool of FIG. 1, as shown in FIG. 2, the same six segments 2 and the same six complementary segment surfaces are provided, corresponding to segments 17 and 19, respectively. Each segment 2 and 4 has a protrusion 23 centered at 16 and recessed in a surface 27 as in the tool of FIG. 1, and also shown in FIG.
Spaces 34 and 36 have a retaining ring 21a in groove 21b, not shown in FIG. 5, for better visibility. Heads 6 and 8.

forming a continuous circular core surface with grooves;
There is continuity between the segments that meet momentarily to form a helical thread 9'.

The segment 2.4 is assembled in a mounting section consisting of a support sleeve 10 having a cylindrical bore 12 following an outwardly tapered bore 14.

The pivot center 16 of each of the 12 segments is.

It is placed at the point where the two taber parts join.

An actuator bin 18, whose longitudinal axis 20 coincides with the longitudinal axis ′ of the support sleeve 10, extends within the collection of segments. The pin cross section perpendicular to axis 20 is circular. At the molding position shown in Fig. 5, the upper part of the bottle 18 is
Together with the upper part of the segment, it forms a continuous surface. The top view of the assembled segments is the same as shown in FIG.

In the forming position (FIG. 5), the conical surface 22 of the actuator is in contact with the corresponding surface 26 of the segment. The projections 23 prevent longitudinal movement of the segments within the sleeve 10.

At the molding position, one end of the core assembly is connected to the cavity plate 3
0 into the mold cavity 28, this cavity plate is movable relative to the support sleeve 1o in contact at the 1 minute m line 32. The cavity is.

It is shaped like the outer shape of the lid, and the core forms the inner shape of the lid. The simplest form is the lid.

It is a disc with a rim or neck around it.

The inner surface of this rim has a threaded portion for screwing the lid onto a threaded neck of a bottle or the like.

After the forming operation, pin 18 is retracted to the position shown in FIG. When moved to the intermediate position of FIG. 6, the hinge releases its hold on the upper end of segment 2.4 and is free to move inward to the release position.The actuator is in the position of FIG. No such movement will take place until the point is reached, since there is a space 34 between the actuator and each of the six segments 2.

This is also because there is a larger space 36 between the actuator and the six segments 40.

In the position shown in FIG. 6, the conical surface 24 of the actuator is in contact with the opposing surfaces of the six segments 2, and the thickest part of the actuator is axially below the pivot center 16. If you continue to lower the actuator,
Each segment 2 swings about the pivot 16 towards the release position, but since the space 36 is wider, segment 4 is not acted upon immediately. When the actuator is lowered further and the gap 36 closes, these segments will also pivot towards the axis 20 as the actuator is lowered further, providing space for the upper part 8 to move accordingly. Here, as in the embodiment of FIG. 1, the space 36 is sufficiently larger than the space 34, such that the segment 4 swings over approximately half the arcuate range of swing of the segment 2. In order that the upper part 38 of the pin 18 in the position of FIG. 6 does not interfere with the beginning of the swinging of the segment 2.4 towards the position of FIG.
There is sufficient room for the sides of segment 2.4.

To repeat the molding cycle, move from the release position shown in Figure 7 to the 5th position.
The actuator pin 18 is moved upwardly to swing the segment into the forming position shown.

The initial movement eliminates the holding pressure on the lower ends of all segments, allowing them to move freely inward until the circumference of the top 38 of the actuator pin reaches the face 26 of the segment 20. Pins do not cause such movement. This means that
Occurs at a location substantially above pivot axis 16 in the direction of axial movement of the actuator pin. It is on the surface 26 of the segment 2 that a force is first applied to initiate the rocking into the forming position. The lower conical surface 24 of the actuator pin 18 is now sufficiently close to the final position of FIG. Does not interfere with radial inward movement of the bottom. When the segment 2 swings into the forming position, it moves the intervening segment 4 into the forming position. When segment 2 reaches the forming position, segment 4 also reaches the forming position.

That is, the position shown in FIG. 2 has been reached.

When the actuator pin moves from the molding position shown in FIG. 5 to the position shown in FIG. 6, a space is created between the actuator pin upper part 38 and the segment before the segments begin to swing together (FIG. 61). Follower segment and recessed upper part 3
There is sufficient space between pin 1 and 80, and the rocking movement of the lower end of the segment caused by the lower part of the actuator pin
8 is unobstructed by the upper segment part of the pivot 16 which contacts the retracting upper part of the pivot 16.

[Brief explanation of drawings]

FIG. 1 is a sectional view taken along line 1 in FIG. 2 of a tool embodying the present invention, and FIG. 2 is a partial plan view showing an enlarged collection of core segments in a forming position. 3 shows the core segment of FIG. 1 in the release position, FIG. 4 shows an enlarged view of a portion of the tool in area A of FIG. 1, and FIG. 6 shows the core segment of FIG. 5 in the intermediate position, and FIG. 7 shows the core segment IA in the released position. 1.3... Mold part, 5... Minute L line,
7... Lower side plate, 9... Support sleeve,
11... Holding plate, 13... Board, 15.
...Mold cavity, l'7,19... Core segment, 35. 37... Actuator pin patent applicant Law Tool Corporation 1
) Representative patent attorney 1) Engraving of the drawings (no changes to the contents - Figure 1, IV 47, J-Z procedure amendment band (method) % formula % 1, Case indication patent application 1988-8 '8507 No. 2 Name forming device for the invention 3 Person making the amendment (Relationship with 'l) Name of patent applicant Law, Saul, Corporation 4, Agent 〒
103 Address: Tokyo Tatemono Building, 1-9-9 Yaesu, Chuo-ku, Tokyo (Telephone: 271-8500) 5. Date of amendment order: July 31, 1980 (shipping date) 6. Address of the inventor subject to the amendment and an application form stating the name of the representative, a proxy statement,
Drawing 7, contents of amendment as shown in attached sheet (1 request for correction) (1 copy of commission request) (1 copy of drawing (3) Engraving of drawing, no change in content)

Claims (1)

Claims: (1) The mold has a cavity which together with the core molds the product at least partially therein. and the shape of the product prevents the core from being pulled out longitudinally and linearly from the molded product;
It is expandable in the molded state. and is retractable in the released state and is comprised of independent individual segments, the attachment of the segments having means for retaining the segments against longitudinal movement within the mold, and having a pivot axis attached to each segment. each segment is capable of swinging about its own axis between an expanded, molded state and a contracted, released state, and is provided with an actuator for moving the segment from one of these states to the other. shall be. Molding equipment. (2) The mounting member surrounds the segment, and the segment is between the actuator and the mounting member. Each segment has first and second cam followers facing the actuator and offset from each other in the longitudinal direction of the segment, and the rocker wheel of each segment is between the two followers of the segment. The molded product is 1. means for manipulating the actuator to move the segments to the released condition when in the groove-shaped cavity; and retaining means for holding the segments 1--so that they do not move in the longitudinal direction under the force of swinging from the molded condition to the released condition. is provided. An apparatus according to claim 1. (3) When the individual pivot axes of each segment are between the ends of the segments, such that one end of the segment moves in one radial direction. The other end of the segment moves in the opposite radial direction. - The device according to claim 1. In the molded state in the bamboo mold cavity, the position of the segments extends over a total of 3600 degrees, each segment contacting the adjacent segment in the cavity. The device according to claim 1, wherein the segments are arranged around the longitudinal axis of the actuator and swing about their respective pivot axes towards and away from the longitudinal axis of the actuator. movable, at least a plurality of adjacent segments are at a predetermined angle to each other and are continuous in contact with each other within the cavity when in the molding position, characterized by a continuous range of product to be molded. The device according to scope 1. (B) The means to hold the segment is the member. and the mounting for each swing is provided by a segment having cooperating means surrounding the respective segment within the member, and the mounting for retaining the segments by a journal restraining longitudinal movement of the respective segment relative to the member. An apparatus according to claim 1. (7) the retaining means has a radially outward projection for each segment, and the mounting member has sockets into which the respective projections extend;
The protrusions are enclosed within sockets that restrict longitudinal movement of the respective segments relative to the mounting member. An apparatus according to claim 1.