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Publication numberCA1099466 A
Publication typeGrant
Application numberCA 249510
Publication date21 Apr 1981
Filing date2 Apr 1976
Priority date5 Apr 1975
Also published asCA1099466A1, DE2514973A1, DE2514973B2, DE2514973C3, US4059375
Publication numberCA 1099466 A, CA 1099466A, CA 249510, CA-A-1099466, CA1099466 A, CA1099466A
InventorsFriedrich Koch, Lothar Fink
ApplicantFriedrich Koch, Lothar Fink, Sopecom S.A. Fribourg
Export CitationBiBTeX, EndNote, RefMan
External Links: CIPO, Espacenet
Vehicle wheel pneumatic tyres and the manufacture thereof
CA 1099466 A
Abstract
ABSTRACT OF THE DISCLOSURE

It is known to mould separate halves of a vehicle tyre by injection moulding and then adhere the halves together.
In this invention, a complete vehicle tyre is injection-moulded in two successive stages in the first of which the two side parts of the type are moulded and partially vulcanised be-tween a core and first outer mould part. The core together with the moulded side parts is then removed and inserted into a second outer mould part and the tread is moulded and connected to the side parts by completing the vulcanisation.
This produces an integral, unitary structure and permits reinforcements to be embedded in the tyre.
Claims(23)
THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An injection moulding apparatus used for making moulded articles comprising a plurality of moulded portions formed in sequence and joined together, the apparatus compri-sing a first injection mould for the moulding of one or more of said portions from a first material, a second injection mould for the moulding of one or more of said portions from a second material, said moulds comprising interchangeable compo-nents or sets of components, a press for closing the injection moulds, and injection units each arranged for the supply of one of said materials to the respective injection mould, where-in the apparatus comprises a common press for accommodating both the first and the second injection moulds together, in which said moulds are spaced apart in the direction of opening and closing of the press, the injection units being operatively connectable to the respective injection moulds, and means for removing said portion or portions from the first injection mould and together with said components or sets of components inserting them into the second injection mould so that the moulding of the article may be completed.
2. An apparatus according to Claim 1, wherein the injection moulds are accommodated one above the other in the common press.
3. An apparatus according to Claim 1, comprising a vertical conveyor with a plurality of lifting platforms whereby the interchangeable components or sets of components are supplied alternately to the injection moulds.
4. An apparatus according to Claim 3, wherein the lifting platforms comprise telescopic or other conveyor means for moving the said components or sets of components to and from stationary parts of the injection moulds.
5. An apparatus according to Claim 3 or 4, wherein the vertical conveyor is provided with an additional lifting platform to support an extra one of said sets of components being heated or otherwise prepared for use in the first in-jection mould.
6. An apparatus according to Claim 1, wherein the common press is constructed for simultaneous opening of the injection moulds accommodated therein.
7. An apparatus according to Claim 1, wherein the first injection mould comprises a set of components for the moulding of portions of said first material, this set of com-ponents including a core, an upper mould part and a lower mould part, and this set of mould components being removable together with a first moulded portion out of the first injec-tion mould and insertable together with said first moulded portion into the second injection mould.
8. An apparatus according to Claim 6 or 7, wherein separable and raisable components of the injection moulds are disposed one above another and are connected to one another by lost-motion coupling means whereby during raising of an upper pressure plate of the press the said components are raised and separated from each other.
9. An apparatus according to Claim 1 or 2, wherein the mould components include an upper part with a centering cone, and a lower part with a centering cone, and a core with a central opening into which the centering cones can protrude and engage whilst remaining spaced apart from each other.
10. An apparatus according to Claim 7, wherein the mould components include outer mould parts each comprising a plurality of relatively movable outer mould segments.
11. An apparatus according to Claim 10, wherein the outer mould segments are movable upon a mould carrier plate and are radially movable in slideways or other guides.
12. An apparatus according to Claim 11, wherein the outer mould segments are movable in unison by a common drive means.
13. An apparatus according to Claim 12, wherein the outer mould segments are mounted on a thrust ring and are displaceable radially by rotation of the thrust ring in the peripheral direction in relation to the outer mould segments.
14. An apparatus according to Claim 13, wherein the outer mould segments engage with obliquely directed reces-ses or guide slots of the thrust ring.
15. An apparatus according to any one of Claims 11 to 13, wherein the lower mould part is mounted on the mould carrier plate and is fixed thereon by a central prominence.
16. An apparatus according to Claim 7, wherein the upper mould part, lower mould part and outer mould parts in-cluding the enclosed core, can be pressed against one another in the closed position by a common closer element or closure bell which partially laterally surrounds the outer mould parts.
17. An apparatus according to Claim 16, wherein the closure bell is formed with guide surfaces converging down-wards or towards the outer mould parts which guide surfaces in the closed position abut in positive fitting manner on center-ing surfaces of the outer mould parts, which centering sur-faces converge upwards or towards the closure bell, in such a way that a mould closure pressure can be transmitted to the upper mould part, the lower mould part, and the outer mould parts.
18. An apparatus according to Claim 16, wherein after the production of side parts of a mould article struc-tural means are provided so that the closure bell can be lifted away from the outer mould part so far that the latter can be moved back from the core in such a way that the upper mould part and lower mould part and the internal core can be lifted out of the region of the outer mould part.
19. An apparatus according to Claim 18, wherein the closure bell and upper mould part and lower mould part are connected with one another in such a way that on opening of the injection mould firstly the closure bell can be lifted away until the outer mould part is raisable and then the upper mould part and lower mould part and the core can be lifted, on further upward movement of the closure bell.
20. An apparatus according to Claim 19, wherein the closure bell and lower mould part are connected with one another by a lifting spindle which extends through the upper mould part and the closure bell and in the lifting spindle there is an upright slot for the introduction of an axially movable locking rod which enters laterally into the closure bell.
21. An apparatus according to Claim 20, wherein the locking rod can be moved by displacement in its axial direction out of the region of the lifting spindle and its slot and thus the closure bell can be lifted away from the upper mould part beyond the movement allowed by the slot.
22. An apparatus according to Claim 21, wherein the closure bell and upper mould part are connected with one another by drag bolts which render possible a stroke of the closure bell in relation to the upper mould part and which stroke is greater than the maximum motion of the closure bell in relation to the upper mould part, this maximum relative motion being limited by the slot of the lifting spindle.
23. An apparatus according to Claim 22, wherein for the removal of a finished moulded article from the mould or for the withdrawal of the core from the injection mould, after the locking rod has been withdrawn out of engagement with the lifting spindle, the closure bell with the upper mould part coupled to it by the drag bolts can be lifted away from the lower mould part and the core, and then the core together with the moulded article can be withdrawn from the lower mould part.
Description  (OCR text may contain errors)

g466 This invention relates to an injection moulding apparatus of the kind (herein called "the kind defined") used for making moulded articles each comprising a plurality of moulded portions formed in sequence one upon another, the apparatus comprising a first injection mould for the moulding of one or more of said portions from a first material, a second injection mould for the moulding of one more of said portions from a second material, at least one press for clo-sing the injection moulds, and injection units each arranged for the supply of one of said materials to the respective injection mould.
With known apparatus of the kind defined there may be disadvantages, for example there may be great expense and space requirements if there are several mould closure ~ :
presses and production is slow because each moulded article has to be completed and removed before commencing to prepare the apparatus for starting the next production sequence. ::
The present invention provides an injection moulding - apparatus used for making moulded articles comprising a plura-lity of moulded portions formed in sequence and joined together, ~ .
the apparatus comprising a first injection mould for the moul-ding of one or more of said portions from a first.material, a second injection mould for the moulding of one or more of said portions from a second material, said moulds comprising inter-changeable components or sets of components, a press for clo-sing the injection moulds, and injection units each arranged for the supply of one of said materials to the respective in-jection mould, wherein the apparatus comprises a common press ;
for accommodating both the first and the second injection - .
moulds together, in which said moulds are spaced apart in the direction of opening and closing of the press, the injection units being operatively connectable to the respective injection moulds, and means for removing said portion or portions from . ~
.

. .

1~99466 the first injection mould and together with said components or sets of components inserting them into the second injec-tion mould so that the moulding of the article may be completed.
The production sequences can be expidited if the injection units allow injection to be affected simultaneously into two or more moulds, and further expedited if there are means for opening the moulds in common with the opening of the press.
The invention will be described in greater detail hereinafter .................................................

-la-1(~9~466 by reference to examples of embodiMent thereof which are illustrat-ed in the accompanying drawings, wherein:-Figure 1 shows a radial vertical cross-section through an injection mould for the production of pneumatic tyres;
Figure 2 shows a vertical section through a press station with an injection mould according to Figure l;
Figure 3 shows a detail of the injection mould~ namely the outer mould part~ in plan view;
Figure 4 shows a further detail of the injection mould, namely the course of injection pas~ages, in plan view;
Figure 5 shows a further detail of the injection mould, namely the course of further injection passages, in plan view;
Figure 6 shows a tyre injection plant in diagrammatic re-presentation in plan view;
Figure 7 shows two injection moulds for the production of tyres arranged one above the other, in vertical section;
Figure 8 is an illustration corresponding to Figure 7 with the mould parts of the injection mould drawn apart, on a reduced scale;
Figure 9 shows a complete tyre injection plant with core withdrawal station, in vertical section;
Figure 10~ which appears on the same sheet as Figure 6, shows a diagrammatic representation of the course of work in a tyre injection plant according to Figure 9;
. Pigure 11 shows a core withdrawal station in vertical .
~ ~ section; and r Figure 12 shows a detail of the core withdrawal station in plan viewO

.

1C~99466 In the drawings, the production of vehicle tyres 10 by injection-moulding, especially by processing rubber, is connected in the present case with a special design configuration of this tyre. The tyre in fact is formed from three parts which are pro-duced in two successive injection actions and connected with one another. The first action here concerns two side parts 11 and 12 and the other a tread 130 The side parts 11 and 12 are moulded in a first injection action and the tread 13 in a second. After the injection of the side parts 11 and 12 their material is firstly partially consolidated, namely its vulcanisation is commenced, in fact up to about 70~ for example. Then the tread 13 is produced and connected with the partially vulcanised side parts 11 and 12 by common vulcanisation to completiQn, so that in the final effect a one-piece pneumatic tyre 10 is producedO The side parts 11 and 12 on the one hand and the tread 13 on the other can here consist of different materials.
The above-mentioned division of the production process renders it pos~ible to work prefabricated one-piece reinforcements, for example a belt 14 and a carcass 15, into the pneumatic tyre.
These insert parts are introduced into the mould cavity for the side parts 11 and 12 and the tread 13 before the injection mouldingO
The tyre 10 can be produced in an injection mould 16 or 16a, 16b, an example of embodiment of which is shown in Figure lo The injection mould 16 is equipped with a solid core 17 (see also Figure 3~, the radially outer zone of the core 17 is adapted, as may be seen from Figure 1, to the internal contour of the tyre 10 to be produced, or serves for the reception of a--prefabricated carcass 15. On the radially inner side this outer zone is adjoined ~,~ _ ~_ by an extension 18 with foot-like widening 19. The foot-like widening 19 is formed upwards and downwards, that is in the axial direction of the core, with converging engaging faces 20 and 21 respectively. The radially inner upper and lower engaging faces 21, directed towards one another at an angle, are equipped with a wear piece 22 of plate form attached replaceably to the widening 19.
The above-mentioned engaging faces 20 and 21 and the wear piece 22 serve for the exact centring of the core in relation to the ad-joining mould partsO The core is made in a plurality of parts, namely consisting of a plurality of segments, for dismantlement.
After the removal of a tyre 10 from the mould, the core 17 is prepared for the next injection action outside the injection mould 16. Any reinforcements proposed, namely the carcass 15 and the belt 14, are drawn on to the core 17 in the assembled positionO
Since the adequate fixing of the belt 14, which in the initial ~ ~
position is approximately cylindrical, in the injection mould is -problematical, here the belt 14 i9 SO dimensioned that it is seated with a certain tension on the core 17 or on the carcass 15. Due to this tension the belt 14 is additionally fixed in relation to the forces occurring in injection, and also slightly convexly shaped in cross-saction.
The injection mould 16 for the reception of the core 17 is of multi-part formation, namely so that the core 17 is completely enclosed. For this purpose the core 17 is received between an upper mould part 27 and a lower mould part 28. These mould parts are provided with recesses in which the core with the extension 18 and the widening 19 fits. A centring cone 23 as part of the upper mould part and a cone 24 as part of the lower mould part enter the central space of the core 17 from above and beneath respectively.

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iU994~6 The upper mould part 27 and lower mould part 28 are provided with mould cavities for the reception of the side parts 11 and 12 of the tyre, including the side parts of the carcass 150 In the radially outer zone the above-mentioned mould parts 27 and 28 te~minate with the external limitation of the side parts 11 and 12.
The tread 13 of the tyre 10 is shaped by an outer mould part 29 or 29a which i5 equipped with a corresponding mould cavity.
The outer mould part encloses the core 17 and the upper and lower mould part~ 27 and 28.
The outer mould part is configured differently for the execution of the injection-moulding process in two actionsO During the first injection action for the production of the side parts 11 and 12 the outer mould part 29 (Figure 1, right half) i8 shaped so that the mould cavity for the side parts 11 and 12 i8 radially outwardly defined by the outer mould part 29 formed without mould cavity and fitting against the belt 140 For the second injection action (Figure 1, left) there serves an outer mould part 29a which is equipped with the mould cavity for the tread l3 adjoining the 8 ide parts 11 and 120 ;
The present injection mould, in the embodiment with the outer mould part 29a, is suitable for the production of one-piece tyres in one injection action.
The above-described mould parts are received between upper ; and lower thrust pieces of a press 30 of a construction type known - in principle, as illustrated in an example of embodiment in Figure ; 2. The press 30 has primarily the task of holding together in the closed position the mould parts forming the injection mould, namely in such a way that no relative displacement takes place during the injection operation " - :

1(~99~66 The upper mould part 28 and the outer mould part 29 or 29a in the present case are arranged on a mould carrier plate 31. On its upper side this has a central prominence 32 which fits into a recess of the lower mould part 28 for the centring of the latter.
The mould carrier plate 31 in turn lies on an under plate 33. Be-neath the latter again, as known in principle, there are arranged a heating plate, an insulating plate, a cooling plate and finally the base plate 34 of the press D
- The upper mould part 27 and the upper region of the outer 10 mould part 29 or 29a are surrounded by an upper thrust element in the form of a closure bell 35. This likewise is provided with a central prominence 36 for the centring of the upper mould part 27. The outer mould part 29 or 29a is equipped in the zone surrounded by the closure bell 35 with centring surfaces 37 con-verginq towards the closure bell 35, which are fittingly surround-ed by corresponding counter-surfaces of the closure bell.
Above the closure bell 35 there follow, as known in principle, the heating plate, insulating plate, cooling plate and thrust plate 38 for the transmission of the closure pressure exerted for 20 example by four pressure-medium-operated columns 39~
The outer mould part 29 or 29a is moveable radially in re-lation to the core 17 for the assembling and separation of the injection mould 16. For this purpose the outer mould part con-si6ts of a plurality of external segments 40, namely for example 8, with radially directed separating surfaces. The outer segments ~ 40 lie with a foot 41 on the mould carrier plate 31 and are r radially displaceable thereon, namely with the aid of separate slider guides 42.
To carry out the opening and closing movements of the outer 1(~99466 mould part 29, 29a a thrust ring 43 is provided here, This is mounted on the mould carrier plate 31 in the region of a recess 44 of the outer segments 400 The outer segments 40 are provided each with two guide rollers 45 which are arranged in the region of the recess 44 and enter an oblique guide slot 46 of the thrust ring 43. By a partial rotation of the thrust ring 43, actuated by a pressure medium cylinder 47, the outer segments 40 are displaced in the radial direction in their guides 42 by means of the guide slots 46 and guide roller~ 45, so that the outer mould part 29, 29a is opened or closed.
For the production of a tyre 10 in two successive injection actions a tyre injection plant 47 (Figure 6) or 48 (Figure 9) is provided which works with at least two complete injection moulds 16 or 16a, 16b respectively. The two injection moulds of a plant differ es~entially only as regards the configuration of the outer mould part~ 29 or 29a. Here the procedure is adopted that firstly the side parts 11 are produced in an injection mould with an outer mould part 29 and then a mould component set consisting of upper mould part 27, lower mould part 28 and core 17 with the already injected tyre parts is taken out of the injection mould and in-serted into an injection mould having an outer mould part 29a.
The individual mould parts are coupled to one another by special drag connections for carrying out the above-mentioned ex-change of mould parts. In the injection mould 16 according to Figure 1~ a lifting spindle 49 is arranged centrally on the lower mould part 28 and extends through the upper mould part 27 and the closure bell 35O This lifting spindle 49 can be fixed in the region of the closure bell 35, namely by an axially displaceable locking rod 50 which enters from the side. This rod enters an elongated _ ~ _ 1~99466 hole or slot 51 of the lifting spinclle 49 in such a way that according to the longitudinal or height dimension of the slot 51 relative movements are possible between lifting spi~dle 49 and locking rod 500 Furthermore the upper mould part 27 is connected with the closure bell 35 through several drag bolts 52 - arranged in distribution. The drag bolts 52 permit a movement clearance between upper mould part 27 and closure bell 35 to an extent which corresponds to the free length of the drag bolt 52, namely, as : far as abutment of a bolt head 53 on the bottom of a recess 54 in the closure bell 35. This clearance is greater than the movement clearance given by the slot 51, After a first injection action for the production of the side parts 11 and 12, firstly the closure bell 35 is lifted away from the upper mould part 27 and the outer mould part 29 by upward movement of the thrust plate 38 and of the parts arranged therebeneath, until the locking rod 50 abutŠ on the upper limit of the slot 51 in the lifting spindle 49. Due to this lifting movement the outer mould part 29 has come free from the closure bell 35 in such a way that the individual outer seg-ments 40 can be driven apartO During this phase the upper mould 20 part 27, lower mould part 28 and core 17 are held in the closed position by thrust bolts 55 charged each by a cylinder (not shown) and passing through the closure bell 35. By further upward move-ment of the thrust plate 38 with the closure bell 35 now the upper mould part, lower mould part and core are lifted out of the region of the outer mould part 29, in such a way that the part of the in-jection mould which has remained behind, namely the outer mould r' part 29 with mould carrier plate 31 and under plate 33, can be ~: moved or driven out of the region of the press 300 In place of the outer mould part 29 without mould cavity for the tread 13 an ,,:

1(~99~66 outer mould part 29a with such a mould cavity and the plates 31 and 33 pertaining to this unit is driven into the press. The thrust plate 38 and thus closure bell 35, upper mould part 27, lower mould part 28 and core 17 are now lowered again into the region of the still open outer mould part. This is then closed again. The material for the tread 13 can now be injected into the mould cavity provided for it, with simultaneous connection with the partly vulcanised side parts 11 and 120 After termination of the injection operation and subsequent complete vulcanisation of the entire tyre 10 the injection mould 16 is opened afresh by upward movement of the thrust plate 38.
Previously however the locking rod 50 is drawn out of engagement with the lifting spindle 49. Thus with corresponding upward move-ment the upper mould part 27 i9 withdrawn by the action of the drag bolts 52 from the core 17 and the lower mould part 28, after the outer mould part 29a has previously been driven back from the core.
The thrust plate 38 with closure bell 35 and upper mould part 27 suspended therefrom are driven upwards until the lower mould part 28 with the lifting spindle 49 seated thereon can be moved out of the region of the press. Now the core 17 with the finished tyre can be lifted out of the lower mould partO Then the tyre is re-moved from the core.
As illustrated diagrammatically in Figure 6, such a tyre injection plant 47 can be equ~pped with a sliding table 56 which is driven to and fro in front of two stationary injection units 57 and 58 and in relation to the press 38 arranged before these injection units 57 and 58. This sliding table 56 i8 eguipped with two mould component sets, each consisting of underplate 33, mould carrier plate 31 and outer mould part 29 or 29a. The above-1(~9~466 mentioned mould parts are arranged with spacing on the slidingtablein such a way that by transverse movement of the sliding table 56 the one or the other mould component set can be fed alternatively to the press 30 and the injection units 57 and 58. Moreover{the lower mould part 28 and core 17 are provided in duplicate, so that during an injection action a core 17 can be removed from the mould and prepared for the next injection action. For this purpose in the tyre injection plant 47 according to Figure 6 corresponding further working stations are provided, namely an alternate station 59 in which the cores 17 prepared for an injection action, namely provided with belt 14 and carcass 15, are taken up and fed to a mould set of the sliding table 56 by a transport device 60 - here represented in simplified form as a pivotable arm - or a core 17 with finished tyre 10 is supplied by the sliding table 56 and de-livered. With the alternate station 59 there is associated a pre-paration station 61 for the assembling and charging of the core 17 with b-lt an~ arcass, also a core withdrawal station 620 The core 17 is transported between these stations 59, 61 and 62 by a further conveyor 63 - here represented in simplified form as pivotable arm.
In the tyre injection plant 48 according to Figure 9, in one common press 64 several injection moulds 16a and 16b, namely two in number, are arranged one above the other so that in one injection action a tyre can be completed (lower injection mould 16b) and at the same time also the side parts for a tyre can be produced (upper injection mould 16a), by an appropriate number of injection units.
The arrangement of the individual mould parts is here selected as the converse of the form of embodiment according to Figure 1. The closure bells 35 allocated to the injection moulds 16a and 16b are .

1~994616 arranged in each case on the underside of the relevant injection mould. Correspondingly the mould carrier plates 31 carrying the outer mould parts 29 or 29a are provided in each case above the associated injection mould 16a, 16b.
With the tyre injection plant 48 there is associated a vertical conveyor 65. In the present case this is equipped with three lifting platforms 66, 67 and 68. With the aid of these lifting platforms 66 to 68, prepared mould component sets con-sisting of the core 17 with upper mould part 27 and lower mould part 28 are conveyed to the injection moulds 16a, 16b or conveyed from one injection mould to the other.
In detail the procedure is adopted that a prepared core 17 (with belt 14 and/or carcass 15) is mounted on the lifting platform 66 ~ituated in the upper position and pre-heated. By lowering of the vertical conveyor 65 by an appropriate amount then this pre-pared mould component set is fed to the upper, open injection mould 16a. The lifting platforms 66 to 68 are equipped for this purpose with a transverse conveyor, namely a transverse conveyor belt 69 which can be extended out telescopically in the direction towards the injection moulds 16a, 16b. The mould component set resting in each case on the tran-~verse conveyor belt 69 is driven at the level of the open injection mould 16a into the open injection mould 16a by lateral extension of the transverse conveyor belt 69. At the same time the injection mould 16b lying therebeneath is charged with a corresponding mould component set, in which however the side parts 11 and 12 have been produced in the injection mould 16a in ~ a preceding injection action~
; After the mould component sets have been driven into the open injection moulds 16a, 16b the latter are closed, namely by .,, ,.

, . .

1(~99466 lowering of the mould carrier plates 31 with the outer mould parts 29 and 29a to the level of the mould component sets upon the transverse conveyor belts 69. Then the segments of the outer mould parts 29 and 29a are driven inwards to abut on the core 17 and on the upper and lower mould parts~ ~ow the transverse conveyor belts 69 can be retracted into the initial position. By further down-ward movement of the thrust plate 38 of the press 64 the mould parts are applied to the respective closure bell 35, grasped by the latter n the closed position and thus fixed. In the subsequent injection operation at the same time the side parts 11 and 12 are produced in the region of the upper injection mould 16a and the tread 13 ofa tyre is produced in the region of the lower injec~ion mould 16bo After termination of the injection operation and the initial and complete vulcanisation the injection moulds 16a, 16b are opened again by converse sequence of movement of the pressO The mould component sets are taken up by extended transverse conveyor ~elts 69 of the lifting platforms 67 and 68, after the vertical conveyor 65 has previously returned into the initial position as illustrated in Figure 9. The mould component set of the injection ; :~
mould 16a~ after retraction of the transverse conveyor belts 69 into the initial position~ is applied by low~ring of the lifting platforms 66~ 67~ 68 to the injection mould 16b~ while the lower mould component set is fed by driving of the transverse conveyor belt 69 of the lifting platform 68 to an opposite core-withdrawal station 62 (Figure 11).
The core withdrawal station 62 is preceded in the example of embodiment according to Figures 9 and 11 by a ~eparation point 70 in which the upper mould part 27 and lower mould part 28 are ~. _ ,~ _ . . .

109946~;

lifted away from the core 17. The core is conveyed by a transport device 86 represented diagrammatically in Figure 12, which extends into the region o~ the core-withdrawal station 620 The transport device 86 is equipped with lateral clamping jaws 87, 88 by which the core 17 is grasped. The upper mould part 27 is lifted away from the core by an upper lifting piston 710 The connection be-tween this lifting piston 71 and the upper mould part 27 can be generated for example by magnets, but can also be made mechanical.
The lower mould part 28 is removed from the core 17 by loweringO
The free core fitted only with the finished tyr,e 10 is then fed by the transport device 86 to the core-withdrawal station 62.
In the present case this consists of an upper carrier plate 72 and a lower carrier plate 73. The core 17 still grasped by the clamping jaws 87, 88 ig accommodated between these carrier plates 72 and 73. The carrier plates 72 and 73 are displaceable in height on vertical spars 740 Thrust elements~ namely pressure medium cylinder~ 75, are arranged on the side of the carrier plates 72 and 73 facing the core 17. Their piston rods are equipped with pressure claws 76 which due to appropriate formation of the lower and upper parts grasp in each case in shape-locking manner one or more of the parts (segments) of the core. The above-mentioned pressure claws here engage on the foot-like widenings 19 of the ' core. Thus on adequate application of force, parts of the core are moved towards the centre point by radially inwardly directed movement of the piston rods of the pressure medium cylinders 75.
The parts of the core grasped by the pressure medium cylinders 75 or their pressure claws 76 are then moved upwards and downwards ,' with the carrier plates 72 and 730 Thus the tyre comes free from '", the core.
- . _ ~_ ., !

i~399~66 The core 17 freed of the finished tyre 10 is then re-assembled and provided with a belt 14 and/or a carcass 15 and introduced afresh into the product:ion process.
The course of the above working steps for the apparatus according to Figures 9 and 11 is reproduced diagrammatically in the illustrations in Figure 10.
For the supply of the different injection materials to the respective mould cavities, special measures are taken in the present case. As may be seen for example from Figures 1, 4 and 5 the materials are fed through different passage systems to the relevant mould cavitiesO In Figure 4 the passage system for the production of the side parts 11 and 12 is illustrated, while Figure 5 shows the passage system for the tread 13 of the tyreO
A main passage 77 and 78 is arranged in each case in the region of the plane of separation between the mould carrier plate 31 and the under plate 33. The main passage 77 or 78 leads in each case as far as an imaginary central axis leading through the centre point of the core 17. The passage is here adjoined by radially directed secondary passages 79 and 80 arranged in star form.
The (shorter) secondary passages 79 for the side part~ 11 and 12 extend in the plane between mould carrier plate 31 and under plate 33 as far as a region lying approximately beneath the inner edge of the mould cavity for the side parts 11 and 12. Thence the secondary passages 79 are conducted with an upright branch 81 through the mould carrier plate 31 and the lower mould part 28 into the core17~ At the level of an (imaginary)central transverse plane of the core the again angled-off branch 81 merges into two distributor passages 82 and 83 which open respectively into the radially inner regions of the mould cavities for the side parts /~
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10994~

11 and 120 As may be seen from Figures 1 and 4, the upper regions of the branch 81 and the distributor passages 82 and 83 extend in the region of a plane of separation between parts of the core.
The passages for the material of the tread 13 are arranged in a manner slmilar in principle. The secondary passages 80 of this system extend into a region beneath the tread 13 or the mould cavity provided for it. Then upwardly directed branches 84 adjoin which are conducted through the mould carrier plate 31 into the outer mould part 29a. The branch 84 then opens with a plurality of branching passages 85 into the mould cavity for the tread 13~ namely in the radial direction in relation to the coreO
The part of the branch 84 extending in the region of the outer mould part 29a and the branching passages 85 are arranged, as may be seen in Figures 1 and 5, in the region of a plane of separation between the outer segments 40 of the outer mould part 29a.
In the plant 48 the main passages 77 for the lower injection mould 16b are arranged in the region of the plane of separation between the downwardly situated closure bell 35 of the injection mould 16a and the mould carrier plate 31 of the injection mould 16b. ~ero an under plate i8 ~bsent irom the injection mou1d 16_.

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Classifications
International ClassificationB29C35/02, B29C45/00, B29D30/06, B29C43/00, B29C45/14, B29C67/00, B29C45/26, B29D30/08, B29L30/00, B29C45/44, B29C45/36, B29C45/16, B29C45/37, B29C41/00
Cooperative ClassificationB29C45/16, B29D30/0678
Legal Events
DateCodeEventDescription
21 Apr 1998MKEXExpiry