DE1479249B2 - DEVICE FOR MANUFACTURING LOCKING CAPS MADE OF PLASTIC FABRIC WITH EQUAL NUMBER OF MALE AND MATRIX MOUNTED IN A CIRCLE ON ROTATING DISCS - Google Patents

Description

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The invention relates to a device for producing F i g. 6 shows a cross section through a male mold and

provide sealing caps made of plastic, in which their bearing parts,

Male and female dies in the same number opposite- F i g. 7 shows a cross section through a die and

lying in a circle on rotating disks other bearing parts,

are brought, with the male molds by cams after- 5 F i g. 8 a schematic representation of the cam

can be operated with each other and the profile to be deformed is in the developed form,

Plastic can be fed as a strip of the device. F i g. 9 shows the individual phases of a

With such molding machines, from thermally complete, automatically performed work plastic Plastic material in the form of tapes playing the device,

or strips in rapid succession continuously compared to FIG. 10, G a cross-section through a finished

end caps of various designs with and cap with internal thread and

Manufactured in large numbers without a thread Fig. 10, H a cross section through a finished

will. These caps are threaded in the device cap.

automatically produced in various work steps. 1 shows the device in an embodiment

does. From the forming of the caps to the form and 15 form for the production of plastic caps with

Cutting off the strip or tape material up to the internal thread. Are on bed 1 of the device

for thread forming and the subsequent separation of two opposing each other at a distance

fixed throw of the finished cap from the Vorrich- cheeks 2 and 2a, in whose center a

These operations are sufficient. Shaft 3 is rotatably mounted, which via a reduction

There are devices for forming counter gear 5 and a clutch 6 of one on the

stands made of plastic known, in which a bed 1 attached motor 4 can be driven,

same number of male and female dies opposite- On the inside of the two cheeks 2 and 2 a is

are mounted lying on rotating disks. an annular groove is provided in each case. In these ring grooves

The male molds are loaded one after the other by cams, cam drums 7 or la are used on their

takes place, and the plastic to be deformed is the 25 free sides, as shown in FIG. 3 can be seen in three

Device supplied as a strip. concentric circles the cams 8, 8 a and 8 b

With the known devices only or 8 ', 8a' and 8b 'can be arranged. Between ,

Flat objects without a thread are economical cheeks 2 and 2 a are shaped disks 9 and 9 a with

be made because an automatic demolding of the shaft 3 rigidly connected. You are in the way

these items is not possible. 30 arranged that between them an annular

In another known press for producing free space 10 is created. Between them and of screw caps, the die or the patrix of the cheeks 2 and 2a should also be ring-shaped hydraulically or pneumatically operated. Remain α through closed spaces 11 and 11, respectively. In the guiding devices, e.g. B. Round plate, which is formed by a molded disk 9 is a plurality of male molds 12 adjustable curves are provided between the filling point and the pressing point, which can be moved near the outer edge of the mold, the work of the press auto-disk 9 can be circled at the same distance from one another will. are arranged in a shape, in such a way that they are

The known devices for producing coaxially to the shaft 3 in the shaped disk 9 back and forth

Sealing caps are structurally complex and can be moved here. In the shaped disk 9 α is a

not suitable, the object according to the invention to 4 ° the number of male molds 12 corresponding number

solve, which consists in sealing caps with large bearings from dies 13, which the patrices 12 exactly

Speed continuously from belt or brush opposite and in the same way as this

fen-shaped thermoplastic material are movable. Each of the male parts 12 and each of the

can be produced economically in large quantities, as dies 13 have a bearing plate 14. A one

45 individual male molds achieved by the device according to the invention are shown in FIG. 6 and a single die

, which is characterized in that the in F i g. 7 shown.

Matrices can be actuated one after the other by cams As shown in FIG. 6 can be seen in the bearing plate and that each male mold and each female mold is provided with an opening 14 of the male mold 12, two opposite the cams 8 and a pushing device, which can also be actuated by rollers 15 and cams arranged on the cam drum 7. It is also provided that each 50 15 a stored. Between the rollers 15 and 15 a patrix has a forming die, which is provided at its one middle roller 15 b opposite the cam 8 b of the die facing end with an external thread in the forked end of a sliding block 16 that the forming die has a stores, which is connected in the middle of the bearing plate 14 and part-cylindrical hollow shaft with a gear as sliding in a cylindrical hollow shaft 18 and that means are provided through which the 55 is guided, the outer end of which as a with a gear during the last phase of the Form pre-external thread 17 a provided forming punch 17 is rotatable output. is formed. The other end of the hollow shaft 18 is in

In the drawings, a preferred embodiment of the bearing plate 14 is supported. Near the bearing plate 14

show example of the invention, the hollow shaft 18 is provided with a gear 19,

F i g. 1 shows a side view of the device 60 with which the hollow shaft 18 can be rotated.

F i g. Figure 2 is a front view of the device, an ejector piston 20 is with its piston rod

F i g. 3 shows a longitudinal section through the molded part of the in the end face of the in the bore of the hollow shaft 18

Device, guided end portion of the sliding block 16 attached.

F i g. 4 is a front view of one of the two walls.

gene of the device with built-in cam drum, 65 times with the end face of the forming die 17

F i g. 5 shows a front view of one of the two rotating from. To the ejection piston 20 in its normal form disks of the device, with a part to hold position, is in the bore of the hollow shaft is cut away, 18 a coil spring 21 around the piston rod

brought, which is biased to hold the forming die 17 in its retracted normal position. In certain working positions of the device, the hollow shaft 18 and thus of the casting die 17 are rotated with the gear 19, while the ejection piston 20 by the action of b on the cam 8 running average roll 15 b and against the action of the coil spring 21 via the slide block 16 and the piston rod is moved back and forth in the hollow bearing 18 so that it alternately emerges from the open end face of the forming die 17 and enters it again. The assembly group consisting of plunger piston 20, piston rod, slide block 16 and central roller 15 α is brought back by the helical spring 21 due to its bias in the starting position in which the cam 8 b does not act on the central roller 15 b .

In the male mold formed in this way, the bearing plate 14 lies in the annular space 11, and the hollow shaft 18 is supported in a bore 22 provided in the molded disk 9. A plurality of such bores 22 are arranged along the peripheral edge of the molding disk 9, and a male mold of the construction described above is provided in each of the bores 22. On both sides of the cylindrical hollow shaft 18 pins 23 and 23 a are provided, one end of which is mounted in bores 24 and 24 a of the shaped disk 9 running parallel to the bore 22 and fastened with the other end in the bearing plate 14. On the pins 23 and 23 a compression springs 25 and 25 a are arranged, which load the bearing plate 14 so that the rollers 15 and 15 α are pressed against the cams 8 and 8 a, so that when the shaped disk 9 relative to the Cheek 2 rotates, the bearing plate 14 and the cylindrical hollow shaft 18 with the forming die 17 are moved back and forth in the same way as the rollers 15 and 15 a running on the cams 8 and 8 a, the ejection piston 20 depending on the profile of the Cam 8 b is moved either simultaneously or independently to perform its ejection movement.

The die 13 has a similar design as the male die 12, but differs from the male die 12 in that the punch 27 is designed at its outer end as a die shape 26 and is made in one piece with the bearing plate 14 a and therefore not around his Axis can rotate. Otherwise, the die 13 resembles the patrix 12 in that the rollers 15 'and 15 a' are arranged opposite the cams 8 'and 8 a' of the cam drum 7 a on the bearing plate 14 a on both sides of the middle roller 15 b ' , which are opposite the middle cam 8b 'is held by the slide block 16'.

The sliding block 16 'lies in the bearing plate 14 a and holds the inner end of the ejection piston 20' wrapped with a helical spring 21 ', while the outer end face of the ejection piston 20' cuts off with the profile of the die shape 26. Just like the male mold 12, the female mold 13 is also held in its position in such a way that its bearing plate 14 α lies in the annular gap 11 a between the rotatable shaped disk 9 α and the cheek 2 a, the punch 27 lying in the bore 22 ', which is provided α in the rotatable shaped disk 9 and is symmetrically aligned with the bore 22 of the shaped disk 9. The number of bores 22 'on the peripheral edge of the shaped disk 9 α corresponds to the number of bores in the shaped disk 9, and each of the bores 22' has a die 13 of the construction described. Pins 23 'and 23 a' provided with compression springs 25 'and 25 a' are arranged between the bearing plate 14 a and the shaped disk 9 a in bores 24 'and 24 d in such a way that the die 13 with the rollers 15' and 15 a ' is pressed against the cams 8 'and 8 a', so that the female mold 26 and the ejection piston 20 'are moved back and forth together with the male mold 12 during the molding process. The molding process will be described in more detail later.

The forming die 17 and the die form 26 are corresponding to the size and shape of the to be produced To measure and train plastic cap. The annular spaces 11 and 11a, in where the main parts of the male molds 12 and the female molds 13 lie, and the annular space 10 between the rotatable shaped disks 9 and 9 a must be according to the size of the required Matrices and patrices can be measured.

The device for rotating the forming punch 17 of the male mold 12 consists essentially of one Toothed segment 28, which is attached to the inner surface of the cheek 2 and shown in FIG. 4 is shown. if the bearing plate 14 of a given patrix 12 this tooth segment 28 during the operational As the shaped disk 9 approaches, the gear 19 on the hollow shaft 18 engages the teeth of the Tooth segment 28 a. It thus rolls on the toothed segment 28 while the forming disk 9 is rotating and causes the hollow shaft 18 and the forming punch 17 to rotate while the male part 12 is in moved in a circular path.

Above or to the side of the device is a material feed device 29 for introduction of plastic softened by heating to the desired degree in the form of a continuous Tape or strip provided. A container 30 for taking out what remains after the molding process Waste is provided on the bed 1 of the machine, and a paddle wheel 31 for removing the produced caps is arranged on the cheek 2 a, as in F i g. 2 is shown. The paddle wheel 31 is through the rotatable shaped disk 9 α by means of a toothing provided on its circumferential surface 32 actuated, as shown in FIG. 1 can be seen, or may be powered by any other suitable means will.

The cams 8, 8 α and 8 b of the cam drum 7 and the cams 8 ', 8 a' and 8 b 'of the cam drum 7 α are shown in the FIGS. 4 and 8 arranged and formed in the manner shown. In Fig. 8, in which the cam profiles are shown in developed form for the purpose of explanation, the cams of the two cam drums 7 and 7a are shown opposite one another for a complete working cycle.

The amount by which these cams rise and fall in profile is determined by the size of the one to be made Cap determined. The movements of the male mold 12 and the female mold 13 during operation are through the profile of these cams controlled so that a complementary movement to perform the im essentially consisting of the molding, cutting, demolding and ejection molding process comes.

The operation of the device is as follows:

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The plastic material P softened by heating is introduced into the device from one side in the form of a band or strip through the annular space 10 between the rotatable shaped disks 9 and 9 a, as shown in FIG. 4 is shown. The mold disks 9 and 9 a rotate in the direction indicated by the arrow in Fig. 4, and thus the male mold 12 is through the cams 8, 8 a and 8 b and the die 13 by the cams 8 ', 8 a' and Sb ' actuated, whereby the coordinated movements shown in Fig. 9 are achieved. As can be seen in particular from FIGS. 8 and 9, when the plastic material P arrives, the male part 12 moves towards the material in position S (Fig. 8) and the corresponding position A (Fig. 9). In the position S ₁ , the material is pressed into the female mold 26 by the forming punch 17, as shown in the position B in FIG. The male mold 12 and the female mold 13 then move together towards the molding disk 9 until the tip of the female mold 26 easily enters the bore 22, as in position C in FIG. 9 to cut the plastic material P from the workpiece Pa . After the workpiece Pa has been separated from the plastic material P by cutting, the die 13 withdraws, as shown in the position D , and leaves the workpiece Pa on the forming punch 17. As shown in the position D in FIG. 9, the ejection piston 20 'emerges from the die mold 26 for a short time as a result of the action of the cam 8 &' in the position S _{3 in} order to ensure a positive separation of the workpiece Pa from the plastic material P . In the position S ₄ , the die 13 begins to move forward and moves outward until the position S _{5 is} reached, while the male die 12 also moves slightly outward. The ejector piston 20 of the male mold 12 emerges easily, and the workpiece Pa is pinched between the ejector piston 20 and the female mold 26. In the position S ₅ , the gear 19 provided on the cylindrical hollow shaft 18 of the male part 12 engages with the toothed segment 28, whereby the forming die 17 and the hollow shaft 18 are rotated, while the male part 12 moves as a result of the rotation of the forming disks 9 and 9 moved in a circular path.

As mentioned, the forming die 17 is provided with an external thread 17 a. Since the direction of rotation is selected so that the forming punch 17 is screwed out of the workpiece Pa , a thread remains on the inner circumferential surface of the workpiece Pa due to the rotation of the forming punch 17. More precisely, from the position S ₅ to the position S ₆ (FIG. 8), the die 13 steps back very gradually while the forming punch 17 rotates. The ejector piston 20 of the male mold 12 also gradually moves outward and follows the movement of the female mold 13, so that the workpiece Pa is held between the ejector piston 20 and the female mold 26 on the path between the positions S ₅ and S _8. This state is in position E in FIG. 9 shown. Since the forming die 17 rotates all this time, the thread formed in the workpiece Pa is not damaged during demolding. In the position S ₆ , the gear 19 disengages from the toothed segment 28, whereby the rotation of the forming die 17 is ended. From position S ₆ to position. S ₇ , the die 13 moves back quickly and completely, while the ejection piston 20 also recedes, and in the position S ₇ the ejection piston 20 'emerges and pushes the workpiece Pa from the die form 26, as in the position F in FIG. 9 is shown. The workpiece Pa falls into a paddle of the rotating paddle wheel 31, which conveys the workpiece into an underlying container from which the caps produced can be removed. The waste falls into bed 1 of the machine.

The above-described sequence of molding operations, which are carried out jointly by the male mold 12 and the female mold 13, begins in the angular position in which the plastic material P is introduced into the machine and ends in another angular position which is at an angle to the inlet point of about 180 °. The above description is based on the manufacture of caps of the type designated Pa , which, as shown under G * in FIG. 10, are provided with an internal thread Sp . If the external thread 17 α 'is omitted, however, caps without thread, such as those under H in FIG. Cap Pa ' shown in FIG. 10 can be produced.

As is clear from the above description, with the device according to the invention a ribbon or strip-shaped thermoplastic material quickly and continuously be processed in caps, which can be manufactured in large quantities and at the inner peripheral surface may or may not have a thread.

Claims (2)

Patent claims: 1. Apparatus for the production of plastic caps, in which the male and female molds are mounted in equal numbers opposite in a circle on rotating disks, the male molds being actuated one after the other by cams and the plastic to be deformed being fed to the device as a strip, characterized in that the dies (13) can also be actuated one after the other by cams (8 ', 8 a') and that each patrix (12) and each die (13) is provided with an ejector device (20, 20 '), which is also provided by cams (8 b, 8 Z /) can be actuated. 2. Apparatus according to claim 1, characterized in that each male mold (12) has a forming die (17), the end facing the die (13) with an external thread (17 a) is provided that the forming die (17) via a cylindrical hollow shaft (18) with a gear (19) is connected and that means are provided through which the gear (19) is rotatable during the last phase of the molding process. For this purpose 4 sheets of drawings