EP0819645A1 - Arbre expansible pneumatique - Google Patents

Arbre expansible pneumatique Download PDF

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Publication number
EP0819645A1
EP0819645A1 EP97111758A EP97111758A EP0819645A1 EP 0819645 A1 EP0819645 A1 EP 0819645A1 EP 97111758 A EP97111758 A EP 97111758A EP 97111758 A EP97111758 A EP 97111758A EP 0819645 A1 EP0819645 A1 EP 0819645A1
Authority
EP
European Patent Office
Prior art keywords
shaft
valve
annular
axis
duct
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP97111758A
Other languages
German (de)
English (en)
Inventor
Claudio Garella
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Finsid Srl
Original Assignee
Finsid Srl
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Finsid Srl filed Critical Finsid Srl
Publication of EP0819645A1 publication Critical patent/EP0819645A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H75/00—Storing webs, tapes, or filamentary material, e.g. on reels
    • B65H75/02—Cores, formers, supports, or holders for coiled, wound, or folded material, e.g. reels, spindles, bobbins, cop tubes, cans, mandrels or chucks
    • B65H75/18—Constructional details
    • B65H75/24—Constructional details adjustable in configuration, e.g. expansible
    • B65H75/242—Expansible spindles, mandrels or chucks, e.g. for securing or releasing cores, holders or packages
    • B65H75/243—Expansible spindles, mandrels or chucks, e.g. for securing or releasing cores, holders or packages actuated by use of a fluid
    • B65H75/2437—Expansible spindles, mandrels or chucks, e.g. for securing or releasing cores, holders or packages actuated by use of a fluid comprising a fluid-pressure-actuated elastic member, e.g. a diaphragm or a pneumatic tube

Definitions

  • Mechanical-type actuating means are based on the principle of inclined planes so as to transform a displacement of an actuating element along the longitudinal axis of the shaft into a radial displacement of the gripping elements - which are coupled with the actuating element by means of matching inclined surfaces - a movement which causes them to emerge or retract from the surface of the shaft itself.
  • This technique is used to construct, for example, expandable shafts in which an axial endless screw is used in order to displace wedges longitudinally, the latter being in turn designed to push gripping keys radially.
  • the expandable shafts obtained in accordance with this technique are robust and low cost, but are difficult to set up correctly and are subject to seizing.
  • Pneumatic-type actuating means consist essentially of inflatable cushions which are located underneath the gripping elements and are housed in associated seats running longitudinally along the shaft and which, inflated with compressed air, expand and push the gripping elements radially outwards, causing them to emerge from the surface of the shaft.
  • the present invention falls within this latter group and, in particular, relates to the device for inflating and deflating these inflatable cushions.
  • a completely pneumatic expandable shaft has a certain number of inflatable cushions, normally three or five, extending longitudinally along the shaft and distributed on the circumference of the shaft in regular angular positions, i.e. three cushions at 120° from one another or five cushions at 72° from one another.
  • These cushions assume a "sausage" shape in that they have a narrow cross-section, having to be accommodated in small-size seats of the shaft, and a considerable length, the expandable shafts being up to a length of 3 m.
  • the inflatable cushions are made from tubes of resilient material, such as rubber, which are closed at the ends by clamping blocks fixed onto the shaft after the cushions have been housed inside it.
  • the cushions are provided with a check valve which allows entry of the air, closes automatically in order to maintain the pressure and allows air to escape only after positive actuation thereof.
  • each cushion should have its own separate valve.
  • the check valves have a stem which extends radially with respect to the axis of the shaft and which emerges inside the central duct with an actuating tip.
  • a sliding pin is located inside the central compressed-air duct; in order to achieve deflation of the cushions, the pin is deeply introduced in the duct until it strikes against the actuating tip of the valves, projecting inside the duct, so as to open the valves themselves. The compressed air is then able to flow out from the check valves and escape externally, running back along the central duct.
  • This sliding pin mechanism is not the only one adopted in pneumatic expandable shafts: what, however, constitutes a common feature of all the solutions proposed in the art is the presence of a rigid opening element, such as the pin mentioned above, which is made to strike mechanically or pneumatically against the actuating tip of the stem of the valves, causing them to open.
  • the pin or other opening element acts on the stem tip with a force component perpendicular to the axis of the valve stem, imparting a lateral force and a bending moment to the latter.
  • the action of the opening element on the actuating tip is hence a source of problems. Moreover this action is often "impulsive" i.e. it occurs within a brief space of time and with a not insignificant force - normally the pin is fired with compressed air against the actuating tip - and is repeated thousands of times during the life of the expandable shaft.
  • the object of the present invention is therefore that of providing an expandable shaft, with a device for inflating/deflating the inflatable cushions, which allows a gentle operating action devoid of lateral stressing, of the actuating tip of the check valves.
  • a pneumatic expandable shaft of the type composed of a hollow cylinder and a plurality of gripping elements emerging from openings present on the surface of said cylinder comprising at least one inflatable cushion located underneath said gripping elements and being provided with at least one check valve for the inflating fluid mounted with its actuating stem arranged radially with respect to the axis of the shaft, as well as an annular chamber for distribution of compressed air to said valve and a first duct for introducing air into said chamber, said annular chamber housing a resilient annular element which is deformable by the action of a fluid under pressure and apt, upon its deformation, to press against said actuating stem in a direction substantially parallel to its axis.
  • said annular chamber is an annular groove formed on a cylindrical rod mounted inside one end of the hollow cylinder, the bottom of said groove having terminating on it a second duct formed in the body of said rod and designed to supply the fluid under pressure which deforms said resilient annular element.
  • the innovative and inventive idea of the present invention is applicable to a conventional pneumatic expandable shaft in which a hollow cylinder 1 houses, in longitudinal seats 2, a series of elongated inflatable cushions 3 which are fixed to the cylinder 1 at their ends by clamping blocks 4 and are each provided with their own check valve 5.
  • inflation of the cushions 3 produces a radial thrust on a series of gripping elements 6 such as keys or spines which, emerging from the associated seats, engage against the internal surface of the hollow core of a bobbin (not shown) supported by the shaft.
  • a cylindrical rod M which is provided with an annular chamber 7, in the form of a groove, and which distributes to the valves 5 compressed air supplied from a first duct 8 formed radially in the thickness of the cylinder 1.
  • the check valve 5 consists of an essentially mushroom-shaped body 5a which is provided with a main axial hole 5d, which receives compressed air from the annular groove 7 and distributes it to secondary transverse holes 5e.
  • the hole 5d houses inside it the valve head 5b with its stem 5c terminating in an actuating tip 5f.
  • the valve is arranged as shown in Fig. 2A, under the thrust of the compressed air supplied from the duct 8.
  • the valve head 5b subject to the pressure present in the inflatable cushion and acting through the secondary holes 5e, occludes the hole 5d as shown in Fig. 2B, keeping the pression in the cushion.
  • the tip 5f of the stem 5c When the inflatable cushion 3 must be discharged in order to remove the bobbin from the shaft, it is necessary to operate the tip 5f of the stem 5c so as to raise the valve head 5b, as shown in Fig. 2A, and allow the air under pressure to escape from the main hole 5d.
  • the tips 5f of the valves 5 were pushed towards the inside of the bodies 5a using a single rigid conical element which, moving forwards perpendicularly with respect to the axis of the stem 5c, would come into contact with the plurality of facing tips inside the central duct, causing them to retract.
  • the Applicant has devised a new constructional solution which uses a pneumatic circuit in order to disengage the check valves.
  • the stem 5c is pushed towards the inside of the body 5a of the valve by a resilient element which is deformed, by the action of compressed air, along the direction of the axis of the stem itself, thus overcoming entirely the problems of the known art.
  • the resilient element consists of a ring-shaped membrane 9 housed on the bottom of the annular groove 7.
  • a second duct 11 running axially inside the cylindrical rod M, connects the bottom of the groove 7 to an air supply.
  • Introducing compressed air into the second duct 11 causes radial expansion of the membrane 9 which pushes the tip 5f gently and in particular in the radial direction, thus opening the check valve 5.
  • This operating mode emerges even more clearly with reference to Figs. 4: in Fig. 4B the resilient membrane 9 is in the rest position and is laid down inside the groove 7, whereas in Fig. 4A the membrane 9 is extended by the action of the compressed air and interferes with the actuating tips 5f of the five valves 5 shown in cross-section.
  • the bottom of the groove 7 is suitably shaped so as to prevent the compressed air introduced by the duct 11 escaping laterally from the membrane 9 without achieving the necessary deformation thereof.
  • the groove 7 has, on the bottom, lateral undercuts 12 inside which the side lips of the membrane 9 are inserted.
  • the cylindrical wall of the body 5a of the valve in the vicinity of the edge of the main hole 5d, has a series of apertures 5g, as visible in Fig. 3.
  • the pressure applied through the first duct 8, in order to inflate the cushions 3, is of the order of 6 atm, having to exert a considerable force on the gripping keys 6, the pressure necessary for activating the deflating device, i.e. the pressure to be exerted through the second duct 11, is considerably lower since it must simply overcome the resilience of the membrane 9, the groove 7 containing air at ambient pressure when the valve 5 is closed.
  • the device proposed by the Applicant completely resolves the drawbacks of the known art since it acts on the check valve by means of a soft element, such as a resilient membrane, and in an axial direction so as not to stress transversely the stem of the valve itself.
  • the present device is fairly efficient, does not involve problems of reliability or working duration and is fairly low-cost, thus resulting in a series of additional advantages with respect to the known art.
  • the device according to the invention functions equally well if a different annular element deformable radially by means of a fluid under pressure is used instead of the resilient membrane; this may be a closed-ring tubular rubber element housed in a circular chamber, radial deformation of which is permitted mainly outwardly.

Landscapes

  • Golf Clubs (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
  • Manipulator (AREA)
EP97111758A 1996-07-17 1997-07-10 Arbre expansible pneumatique Withdrawn EP0819645A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT96MI001479A IT1283439B1 (it) 1996-07-17 1996-07-17 Albero espansibile pneumatico
ITMI961479 1996-07-17

Publications (1)

Publication Number Publication Date
EP0819645A1 true EP0819645A1 (fr) 1998-01-21

Family

ID=11374601

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97111758A Withdrawn EP0819645A1 (fr) 1996-07-17 1997-07-10 Arbre expansible pneumatique

Country Status (2)

Country Link
EP (1) EP0819645A1 (fr)
IT (1) IT1283439B1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001075319A1 (fr) * 2000-04-01 2001-10-11 Teknek Electronics Limited Arbre
CN101602450B (zh) * 2009-07-02 2011-04-06 西南铝业（集团）有限责任公司 一种气囊式胀轴
CN110342348A (zh) * 2019-07-17 2019-10-18 南京信息职业技术学院 一种自动胀缩轴

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2145220A5 (fr) * 1971-07-02 1973-02-16 Gattrugeri Giovanni
EP0665180A2 (fr) * 1994-02-01 1995-08-02 I.E.S. INTERNATIONAL EXPANDING SHAFTS S.r.l. Arbre d'enroulement à expansion pneuamatique avec dispositif auto-centrant mécanique

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2145220A5 (fr) * 1971-07-02 1973-02-16 Gattrugeri Giovanni
EP0665180A2 (fr) * 1994-02-01 1995-08-02 I.E.S. INTERNATIONAL EXPANDING SHAFTS S.r.l. Arbre d'enroulement à expansion pneuamatique avec dispositif auto-centrant mécanique

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001075319A1 (fr) * 2000-04-01 2001-10-11 Teknek Electronics Limited Arbre
CN101602450B (zh) * 2009-07-02 2011-04-06 西南铝业（集团）有限责任公司 一种气囊式胀轴
CN110342348A (zh) * 2019-07-17 2019-10-18 南京信息职业技术学院 一种自动胀缩轴

Also Published As

Publication number Publication date
IT1283439B1 (it) 1998-04-21
ITMI961479A0 (fr) 1996-07-17
ITMI961479A1 (it) 1998-01-17

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