GB1572926A

GB1572926A - Device for stripping off elastic rings lying axially side in annular grooves in the outer periphery of a mould core

Info

Publication number: GB1572926A
Application number: GB3770677A
Authority: GB
Original assignee: SEIDL KG MASCHF
Current assignee: SEIDL KG MASCHF
Priority date: 1976-09-10
Filing date: 1977-09-09
Publication date: 1980-08-06
Also published as: FR2364101B1; IT1089840B; FR2364101A1; DE2640835B1; DE2640835C2

Description

(54) DEVICE FOR STRIPPING OFF ELASTIC RINGS LYING AXIALLY SIDE BY SIDE IN ANNULAR GROOVES IN THE OUTER PERIPHERY OF A MOULD CORE (71) We, MASCHINENFABRIK SEIDL KG, a company organised under the laws of the Federal Republic of Germany, of 461-463, Dachauer Strasse, D-8000 Munched 50, Federal Republic of Germany, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be described in and by the following statement: The invention relates to a device for stripping off elastic rings lying axially side by side in annular grooves in the outer periphery of a mould core.

In the prior art a device of this kind is already known in which longitudinally extending belts are disposed around the mould core.

With the aid of these belts the elastic rings are gripped individually and moved one after the other over the individual ring grooves to an aligning element.

This known device has the disadvantage that cn the one hand it is expensive to construct and on the other hand it is not able to strip the rings off the mould core without damaging them. Each ring must be moved individually over the annular grooves lying in front of it, so that firstly the stripping operation is difficult and secondly the ring may also be damaged because of frequent turning. Also the output of this device is low.

In the prior art a method and an apparatus for stripping objects from mould cores are also known, in which compressed air is used for the stripping operation. This compressed air works with belts extending around the mould cores, the annular elastic objects being stripped off the mould cores through this cooperation. This known device is also rela lively expensive to construct.

In contrast thereto the invention seeks to provide a device of the kind first defined above which enables elastic rings disposed axially side by side in annular grooves in the outer periphery of a mould core to be stripped off the latter in a simple, non-damaging manner and with high efficiency.

According to the invention we provide a device for stripping off moulded elastic rings lying axially side by side in annular grooves in the outer periphery of a mould core, which comprises an inner sleeve which is adapted to be pushed over the mould core and which in its front region has holes and is surrounded by an outer sleeve disposed at a radial distance from it and having a conical front end face, a stripping piston being slidable on the said outer sleeve, while the annular space between the inner and outer sleeves can be brought into communication with a source of compressed air which is emitted from said holes to assist in entering the device into each moulded ring, said outer sleeve being adapted to receive the moulded rings which can be removed from said outer sleeve by said piston.

The advantage is thereby gained that the rings are removed rapidly and without damage from the mould core with the aid of mechanical-pneumatic means. Between the rings and the mould core a cushion of compressed air is formed, which enables the rings to be transported rapidly and reliably in succession onto a sleeve, from which they can afterwards all be pushed off simultaneously with the aid of a stripping element. Elastic rings are thus stripped off a mould core very efficiently and in a simple manner without being damaged, while the use of compressed air in itself does not call for any protection of the elements.

As a further development of the invention the inner sleeve has a recess extending around it in the region of the- radial holes. By means of this recess the working air is moved in an advantageous manner in the direction of the ring to the extent of about 90%, whereby an additional annular chamber is formed and working air pressure is built up. Each individual ring to be lifted out of an annular groove can thus easily be removed and moved onto the outer periphery of the outer sleeve.

According to another advantageous feature of the invention the outer sleeve is surrounded by a jacket tube which is spaced apart from it and in the front end region of the inner and outer sleeves has a ring adapted to sur round the moulded rings successively to ensure that only one mould ring at a time Is carried on to said outer sleeve. Through this jacket tube in conjunction with the slip ring it is reliably ensured that the rings which are to be stripped off will be pushed in succession onto the outer sleeve.

According to another expedient feature the stripping piston can be moved by fluid pressure, so that the compressed air source can be used simultaneously for operating the stripping piston.

As a further development of the invention there is disposed between the annular space and the compressed air source a control unit by which either the annular space or the rear side of the stripping piston mounted between the jacket tube and the outer sleeve can be supplied with compressed air. Through simply switching over the control unit the rings can thus be stripped off the mould core in one position, while thereupon when the control unit is switched over the rings can all be simultaneously removed from the outer periphery of the outer sleeve with the aid of the stripping piston.

As a further development of the invention the control unit can be adapted to be connected to a damping member to achieve a soundproofing action.

According to another advantageous feature of the invention the stripping piston has at least one longitudinal groove in the region of its mounting on the outer sleeve. This longitudinal groove provides the advantage of facilitating the stripping-off of the rings disposed on the outer periphery of the outer sleeve.

According to another expedient feature the outer sleeve has holes distributed over its periphery. In conjunction with the groove in the stripping piston these holes improve the ability of the rings to slide on the outer sleeve, so that the rings can be more easily moved onto and off the outer sleeve. A kind of air cushion is thus formed which improves the movability of the elastic rings.

According to a further development of the invention the jacket tube is provided on its periphery, in the front region, with a vent hole. This vent hole ensures that the stripping piston will not be under pressure in its front end position.

According to another advantageous feature of the invention the rear end wall of the inner sleeve has a vent hole through which air leaks can escape, thereby improving the mode of operation of the device of the invention.

As a further improvement of the invention the core of the mould may be provided, behind the last ring, with a stripping part having a recess into which the front region of the inner and outer sleeves can be inserted. It is thus possible for the last and last but one rings to be correctly removed from the mould core and pushed onto the outer periphery of the outer sleeve.

The invention is described more fully below with the aid of examples of embodiment, which are illustrated in the accompanying drawings, in which: Figures 1, 2, and 3 show a device for stripping elastic rings off a mould onto the outer periphery of a sleeve; Figure 4 is a diagrammatical side view of the device in use on a tool; Figure 5 shows on a larger scale a detail of Figure 4; Figure 6 is a diagrammatical side view in section, showing the device in its rear end position; Figure 7 shows another embodiment of the invention, and Figure 8 is a diagrammatical side view of the device and tool.

According to Figure 1 the device 4 for stripping elastic rings 24, 25, and 26 from a mould core 3 comprises essentially an outer sleeve 6 and an inner sleeve 7 disposed at a distance from the latter. Between the inner sleeve 7 and the outer sleeve 6 an annular space 32 is thus formed.

The outer sleeve 6 has a smooth outer periphery 37 and a conical end face 36.

The rings 24, 25, and 26 lie in individual annular grooves 33 on the mould core 3. As shown in Figure 4, the mould core 3 is surrounded by the upper part 1 and the lower part 2 of a mould.

For the purpose of stripping off the rings 24, 25, 26 the device 4 works in the following manner: The device 4 is pressed by its front end face against the first ring 24, while at the same time compressed air flows towards the ring 24 through the annular space 32 between the outer sleeve 6 and the inner sleeve 7, by way of holes 35 distributed over the periphery. In the region of the annular groove 33 in which the ring 24 is seated a cushion of compressed air is thus formed, so that when the device 4 is pressed against the ring 24 the latter is raised out of its annular groove 33, as shown in Figure 2, and pressed against the next ring 25.

The supply of compressed air also builds up pressure, this action being improved by a recess 19 in the inner periphery of the inner sleeve 7. Compressed air thus flows in the direction of the ring and into the working region to the extent of about 90%. As shown in Figure 2, the ring 24 slides over the conical end face 36 onto the smooth outer periphery 37 of the outer sleeve 6.

As shown in Figure 3, the device 4 can now be pushed further to the left, and by a mechanical-pneumatic action thus lifts the next ring 25 out of its annular groove 33, presses the ring 25 against the next ring 26, and thus moves the ring 25 onto the conical surface 36 and then onto the smooth outer periphery 37 of the outer sleeve 6.

As shown in Figures 1, 2, and 3, with the aid of the mechanical-pneumatic action of the device 4 the individual rings 24, 25, 26 and so on can be lifted out of their respective annular grooves 33 through the building-up of a cushion of compressed air, without undergoing any damage and as this movement continues they are pushed onto the outer periphery 37 of the outer sleeve 6.

In Figure 4 the device 4 is shown in greater detail. As already stated, it consists essentially of the inner sleeve 7, the outer sleeve 6 spaced apart from the latter, the rear end wall 38 in the region of the inner and outer sleeves 6 and 7 respectively, and a jacket tube 5 which surrounds the two sleeves 6 and 7. The jacket tube 5 is joined to the rear end wall 38. This rear end wall 38 forms a control part 8 and has a bore 13 for an annular nozzle and a bore 14 for a stripping piston 9. This stripping piston 9 is mounted for sliding on the outer periphery 37 of the outer sleeve 6 and is disposed between the jacket tube 5 and the outer sleeve 6. Between the outer periphery 37 of the outer sleeve 6 and the inner periphery of the stripping piston 9 longitudinal grooves 10 are provided.

As shown in Figures 4 and 5, the jacket tube 5 has a ring 12 extending around its front region. This ring 12 extending around the front region serves the purpose of ensuring that only one ring 24, 25, 26, etc. at a time will be carried in succession onto the outer periphery 37 of the outer sleeve 6. This slip ring 12 thus correctly ensures that only one ring 24, 25, 26 is moved at a time over the conical end face 36 ouw the outer periphery 37 of the outer sleeve 6, so that the individual rings 24, 25, 26 are pushed one after the other and in correct sequence onto the outer sleeve 6.

As can be seen in Figure 4, the control part 8 is connected to a control unit 40 which comprises an upper control part 41 and a lower control part 42. The control unit 40 is in addition adapted to be connected to a damping element 15 and to a compressed air source 60 shown in Figure 8.

If for example the control unit 40 is moved downwards so that the upper control part 41 comes into operation, compressed air passes from the compressed air source 60 into the bore 13 for the annular nozzle, so that by way of the annular chamber 32 between the outer sleeve 6 and the inner sleeve 7 and also by way of the holes 35 compressed air passes out and ensures that, as previously described, the rings 24, 25, 26 are pushed one after the other onto the outer sleeve 6. When therefore the device 4 is pushed to the left, the rings 24, 25, 26 etc. shown in Figure 4 are lifted out of their respective annular grooves 33 in the mould core 3 and moved onto the outer periphery 37 of the outer sleeve 6.

Since after being lifted out of its annular groove 33 the last ring 30 will then not be able to bear against a ring following it, as shown in Figures 4 and 6 the mould core 3 is provided with a stripping part 27 having a recess 28. As shown in Figure 6, the front region of the outer sleeve 6, that is to say the conical end surface 36 and the front region of the inner sleeve 7, i.e. the recess 19, slides into this recess 28, the ring 30 bearing against the end face 45 of the stripper part 27 and thus being pushed over the conical end face 36 onto the outer periphery 37 of the outer sleeve 6. It is thus possible for the last ring 30 also to be correctly removed from the mould core 3, that is to say to be lifted out of its annular groove 33.

Once all the rings 24, 25, 26 . . . 30 have been removed from the mould core 3 and placed on the outer periphery 37 of the outer sleeve 6, the control unit 40 is changed over as shown in Figure 4, so that the bottom control part 42 now comes into action. Compressed air thus passes from the compressed air source 60 through the bore 14 for the stripping piston 9 into a chamber 43, so that the stripping piston 9 is moved to the left and thus all rings 24, 25, 26...30 disposed on the outer periphery 37 of the outer sleeve 6 are correctly stripped off. For this purpose the device 4 is naturally moved away from the mould core 3 and from the upper part 1 and lower part 2 of the mould.

In order to facilitate the stripping operation, when the stripping piston 9 moves forwards compressed air passes at the same time through the longitudinal grooves 10 to the individual rings 24, 25, 26... 30, so that an air cushion is formed and stripping is thus facilitated.

As shown in Figure 7, holes 29 may also be provided in the outer periphery 37 of the outer sleeve 6. Through these holes 29, which are distributed over the outer periphery 37 of the outer sleeve 6, a kind of air cushion is formed, whereby the ability of the rings 24, 25, 26... 30 to slide on the outer sleeve 6 is improved and thus the movement of the rings 24, 25, 26. .. 30 onto and off the outer periphery 37 of the outer sleeve is simplified.

When the stripping piston 9 has now been moved to its foremost end position, the compressed air which previously moved the stripping piston 9 can pass out through a vent hole 11 in the jacket tube 5, so that no pressure is applied to the stripping piston 9 and its operation is thus terminated. After the control unit 40 has then been switched over from the control part 42 to the control part 41 the device 4 will once again be able to strip elastic rings 24, 25, 26... 30 off the next mould core 3.

As can be seen in Figure 5, the compressed air coming from the compressed air source 60 passes out through the annular space 32 and the recess 19. It is conceivable for part of the air to pass through a narrow annular gap 50 between the mould core 3 and the inner periphery of the inner sleeve 7 into a space 44 which is bounded by the end face of the mould core 3, the inner periphery of the inner sleeve 7, and the end face of the rear end wall 38. In order to prevent pressure from undesirably building up there, the rear end wall 38 is provided with a vent hole 17 for air leakages, as shown in Figure 4, so that it is ensured that compressed air will not undesirably accumulate in this space 44 and hinder the operation of the device 4.

In Figure 8 the device is shown once again diagrammatically. It is suspended on a balancing part 21, has a handle 22 and a control handle 18, and in addition is connected by a pipe 16 to the compressed air source 60.

Between the device 4 and the compressed air source 60 an air preparation device 23 is also provided. This air preparation device 23 con sists of a pressure reducer, a vessel, and a pressure gauge, the vessel containing an aqueous solution containing a small proportion of alkali. The compressed air coming from the compressed air source 60 is thus enriched, so that this mixture, which passes through the control unit 40 either into the bore 13 or into the bore 14 in the device 4, will improve the slidability of all the rings 24, 25, 26...30 and thus make them more slippery. The opera tion of the device 4 is thereby considerably facilitated. As shown in Figure 8 the device also need not be held, since it is suspended on the balancing part 21. For the purpose of stripping the rings 24, 25, 26...30 from the mould core 3, which together with the upper part 1 and lower part 2 form a mould 20, the device 4 is simply moved to the left towards the rings 24, 25, 26... 30 disposed on the mould core 3, the rings 24, 25, 26... 30 thus being stripped off the mould core 3 in the manner already illustrated in Figures 1 to 3. After all the rings 24, 25, 26... 30 have been placed on the outer peri phery 37 of the outer sleeve 6, the device 4 is brought back to the starting position shown in Figure 8, this return movement being facilitated by the balancing part 21. By means of the control handle 18 the control unit 40 can now be switched over so that after the operation of the control part 41 the lower control part 42 is now brought into action and thus the rings 24, 25, 26... 30 disposed on the outer periphery 37 of the outer sleeve 6 can now be stripped off by means of the sapping piston 9.

device 4 provides a mechanical pnzmatic action which makes it possible for the rings 24, 25, 26... 30 to be successively lifted off Phe mould core 3 and pushed onto the euter sleeve 6 in a simple, effective manner. Stripping from the outer sleeve 6 is likewise effected by a mechanical-pneumatic action, so that all in all rapid, clean operation not injurious or dangerous to health is ensured while the individual elastic rings 24, 25, 26...30 cannot be damaged.

WHAT WE CLAIM IS: 1. A device for stripping off moulded elastic rings lying axially side by side in annular grooves in the outer periphery of a mould core, which comprises an inner sleeve which is adapted to be pushed over the mould core and which in its front region has holes and is surrounded by an outer sleeve disposed at a radial distance from it and having a conical front end face, a stripping piston being slidable on the said outer sleeve, while the annular space between the inner and outer sleeves can be brought into communication with a source of compressed air which is emitted from said holes to assist in entering the device into each moulded ring, said outer sleeve being adapted to receive the moulded rings which can be removed from said outer sleeve by said piston.

2. A device according to Claim 1, characterised in that in the region of said holes the inner sleeve has a recess extending around it.

3. A device according to Claims 1 or 2, characterised in that the outer sleeve is surrounded by a jacket tube which is spaced apart from it and in the front end region of the inner and outer sleeves has a ring adapted to surround the moulded rings successively to ensure that only one moulded ring at a time is carried on to said outer sleeve.

4. A device according to Claim 3, characterised in that the stripping piston is adapted to be moved by fluid pressure.

5. A device according to Claim 3, characterized in that between the annular space and the compressed air source a control unit is disposed, by which either the annular space or the rear side of the stripping piston mounted between the jacket tube and the outer sleeve can be supplied with compressed air.

6. A device according to Claim 5, characterized in that the control unit is adapted to be connected to a sound-damping member.

7. A device according to one of Claims 4 to 6, characterized in that the stripping piston has at least one longitudinal groove in the region of its mounting on the outer sleeve.

8. A device according to one of Claims 1 to 7, characterized in that the outer sleeve has holes distributed over its periphery.

9. A device according to one of Claims 3 to 5, characterized in that the jacket tube is provided on its periphery, in the front region, with a vent hole.

10. A device according to one of Claims 1 to 9, characterized in that the rear end wall of the inner sleeve has a vent hole.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. air coming from the compressed air source 60 passes out through the annular space 32 and the recess 19. It is conceivable for part of the air to pass through a narrow annular gap 50 between the mould core 3 and the inner periphery of the inner sleeve 7 into a space 44 which is bounded by the end face of the mould core 3, the inner periphery of the inner sleeve 7, and the end face of the rear end wall 38. In order to prevent pressure from undesirably building up there, the rear end wall 38 is provided with a vent hole 17 for air leakages, as shown in Figure 4, so that it is ensured that compressed air will not undesirably accumulate in this space 44 and hinder the operation of the device 4. In Figure 8 the device is shown once again diagrammatically. It is suspended on a balancing part 21, has a handle 22 and a control handle 18, and in addition is connected by a pipe 16 to the compressed air source 60. Between the device 4 and the compressed air source 60 an air preparation device 23 is also provided. This air preparation device 23 con sists of a pressure reducer, a vessel, and a pressure gauge, the vessel containing an aqueous solution containing a small proportion of alkali. The compressed air coming from the compressed air source 60 is thus enriched, so that this mixture, which passes through the control unit 40 either into the bore 13 or into the bore 14 in the device 4, will improve the slidability of all the rings 24, 25, 26...30 and thus make them more slippery. The opera tion of the device 4 is thereby considerably facilitated. As shown in Figure 8 the device also need not be held, since it is suspended on the balancing part 21. For the purpose of stripping the rings 24, 25, 26...30 from the mould core 3, which together with the upper part 1 and lower part 2 form a mould 20, the device 4 is simply moved to the left towards the rings 24, 25, 26... 30 disposed on the mould core 3, the rings 24, 25, 26... 30 thus being stripped off the mould core 3 in the manner already illustrated in Figures 1 to 3. After all the rings 24, 25, 26... 30 have been placed on the outer peri phery 37 of the outer sleeve 6, the device 4 is brought back to the starting position shown in Figure 8, this return movement being facilitated by the balancing part 21. By means of the control handle 18 the control unit 40 can now be switched over so that after the operation of the control part 41 the lower control part 42 is now brought into action and thus the rings 24, 25, 26... 30 disposed on the outer periphery 37 of the outer sleeve 6 can now be stripped off by means of the sapping piston 9. device 4 provides a mechanical pnzmatic action which makes it possible for the rings 24, 25, 26... 30 to be successively lifted off Phe mould core 3 and pushed onto the euter sleeve 6 in a simple, effective manner. Stripping from the outer sleeve 6 is likewise effected by a mechanical-pneumatic action, so that all in all rapid, clean operation not injurious or dangerous to health is ensured while the individual elastic rings 24, 25, 26...30 cannot be damaged. WHAT WE CLAIM IS:

1. A device for stripping off moulded elastic rings lying axially side by side in annular grooves in the outer periphery of a mould core, which comprises an inner sleeve which is adapted to be pushed over the mould core and which in its front region has holes and is surrounded by an outer sleeve disposed at a radial distance from it and having a conical front end face, a stripping piston being slidable on the said outer sleeve, while the annular space between the inner and outer sleeves can be brought into communication with a source of compressed air which is emitted from said holes to assist in entering the device into each moulded ring, said outer sleeve being adapted to receive the moulded rings which can be removed from said outer sleeve by said piston.

11. A device according to Claim 1, charac

terized in that the mould core is provided, behind the last ring, with a stripping part having a recess into which the front region of the inner and outer sleeves can be inserted.