Claims
- 1. A positioning device for a strip-guide member, in combination with a strip-coiling mandrel, of a strip coiler, said device comprising:
- a linkage carrying said member and displaceable to shift said member toward and away from said mandrel; and
- an elongated pneumatic-hydraulic unit connected to said linkage, said unit comprising
- pneumatic cylinder means including a pneumatic cylinder having a working chamber and a pneumatic piston,
- means forming a hydraulic cylinder carried by said pneumatic piston and having a hydraulic piston connected to said linkage for displacing same,
- means for independently hydraulically pressurizing said hydraulic cylinder and pneumatically pressurizing said pneumatic cylinder, and
- means for supporting said unit at an upper end thereof, said pneumatic piston being tubular and enclosing said hydraulic cylinder, said hydraulic piston extending downwardly out of said tubular piston.
- 2. The device defined in claim 1 wherein said pneumatic cylinder is formed with a plunger portion extending in the direction of displacement of said pneumatic piston and extending from said pneumatic cylinder means in a limited-stroke position of said pneumatic cylinder.
- 3. The device defined in claim 2 wherein said plunger portion is hollow and contains compressed air communicating with compressed air in said pneumatic cylinder.
- 4. The device defined in claim 1, wherein the stroke of said hydraulic piston is greater than that of said pneumatic piston and is at least equal to the length of an elongated portion of said pneumatic piston provided with said hydraulic cylinder.
- 5. The device defined in claim 1, wherein said hydraulic piston is formed as a differential piston and defines in said hydraulic cylinder a pair of independently pressurizable working compartments.
- 6. The positioning device defined in claim 1 wherein said hydraulic cylinder has two compartments and a bottom at its upper end, said bottom being provided with passages opening upwardly and communicating with said compartments.
- 7. The positioning device defined in claim 1 wherein upon hydraulic pressurization of said chamber, said means forming said hydraulic cylinder is drawn further into said pneumatic cylinder means.
- 8. The positioning device defined in claim 1 wherein said linkage includes an arm articulated on a support, a pivot lever connected with said arm and swingably displaceable about an axis, a carrier for said member, and a toggle lever connecting said carrier to said pivot lever whereby said levers and said carrier form a five-member planar linkage.
- 9. The positioning device defined in claim 1, further comprising a carrier for said member connected to said linkage, said carrier being directly swingable on a fixed frame, said linkage and said carrier forming a four-pivot swingable structure for positioning said member relative to said mandrel.
- 10. The positioning device defined in claim 1, further comprising a position detector for said linkage and control means responsive for said position detector for regulating the position of said member relative to said mandrel.
- 11. The positioning device defined in claim 10 wherein a plurality of such members is disposed in angularly spaced relationship around said mandrel and each of said members is provided with a respective carrier, and a respective pneumatic-hydraulic unit for displacing same.
- 12. The positioning device defined in claim 11, further comprising a strip displacement detector respective of the movement of said strip for actuating said units in succession to spirit said members away from said mandrel and return said units toward said mandrel as said strip passes around said mandrel.
- 13. The positioning device defined in claim 11 wherein the first of said members encountered by a strip as it coiled on said mandrel has a five-member linkage connecting it to its respective unit.
- 14. The positioning device defined in claim 10, further comprising programming means responsive to said position detector and included in said control means for regulating the position of said member with respect to said mandrel.
Priority Claims (2)
Number |
Date |
Country |
Kind |
3026524 |
Jul 1980 |
DEX |
|
3307840 |
Mar 1983 |
DEX |
|
CROSS REFERENCE TO RELATED APPLICATION
This application is a continuation-in-part of Ser. No. 283,004, filed July 13, 1981, now U.S. Pat. No. 4,404,831.
US Referenced Citations (9)
Foreign Referenced Citations (1)
Number |
Date |
Country |
546126 |
Jun 1942 |
GBX |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
283004 |
Jul 1981 |
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