EP0819643A1 - Arbre expansible à commande pneumatique - Google Patents

Arbre expansible à commande pneumatique Download PDF

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Publication number
EP0819643A1
EP0819643A1 EP97111752A EP97111752A EP0819643A1 EP 0819643 A1 EP0819643 A1 EP 0819643A1 EP 97111752 A EP97111752 A EP 97111752A EP 97111752 A EP97111752 A EP 97111752A EP 0819643 A1 EP0819643 A1 EP 0819643A1
Authority
EP
European Patent Office
Prior art keywords
piston
shaft
expandable shaft
gripping elements
cylinder
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Withdrawn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
EP97111752A
Other languages
German (de)
English (en)
Inventor
Claudio Garella
Paolo 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 EP0819643A1 publication Critical patent/EP0819643A1/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Withdrawn legal-status Critical Current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
    • B65H75/248—Expansible spindles, mandrels or chucks, e.g. for securing or releasing cores, holders or packages expansion caused by actuator movable in axial direction
    • B65H75/2484—Expansible spindles, mandrels or chucks, e.g. for securing or releasing cores, holders or packages expansion caused by actuator movable in axial direction movable actuator including wedge-like or lobed member

Definitions

  • the expandable shaft has a plurality of gripping elements such as movable blocks, spines or claws, emerging from the external surface thereof and apt to grip the core of the bobbin, when they are in the extracted position, and allow disengagement of the bobbin from the shaft, when they are in the retracted position.
  • gripping elements such as movable blocks, spines or claws, emerging from the external surface thereof and apt to grip the core of the bobbin, when they are in the extracted position, and allow disengagement of the bobbin from the shaft, when they are in the retracted position.
  • the art offers different constructional types for performing the extraction/retraction movement of these gripping elements, which can be basically summarised as three types: mechanical, pneumatic and pneumatic/mechanical.
  • the gripping elements are made to emerge by means of devices which transform the displacement of an actuating element along the longitudinal axis of the shaft into a radial displacement of the gripping elements, which allows them to emerge or retract from the surface of the shaft itself.
  • This technique is used, for example, for the construction of expandable shafts in which an axial endless screw displaces longitudinally wedges capable, in turn, of radially displacing gripping elements, such as keys.
  • the expandable shafts obtained in accordance with this type are strong and low-cost, but give rise to problems of assembly tolerances and are subject to seizing.
  • the inflatable cushions are deformed differently from one another depending on the load applied locally, such that the gripping spines which are under more stress at a given moment emerge from the shaft to a lesser extent than the gripping splines which are under less stress. This results in the gripping splines arranged on the same section emerging in a non-symmetrical manner, thus adversely affecting centring of the bobbin on the axis of rotation.
  • the present invention falls within this latter group and, in particular, provides considerable improvements to the pneumatic/mechanical expandable shafts, so as to render them flexible in the employment and extremely simple in terms of assembly.
  • an expandable pneumatic/mechanical shaft is provided, on one hand, with a plurality of gripping elements inserted in associated seats formed on the surface of the shaft - having externally a surface parallel to the axis of the shaft and internally an oblique wedge-shaped surface - and, on the other hand, with a piston movable longitudinally inside the shaft and actuated pneumatically so that, with its displacement, it acts on a plurality of wedge-shaped pushing elements which, in turn, act on the facing wedge-shaped surfaces of the respective gripping elements, causing them to emerge from their seats.
  • This configuration is able to overcome both the drawbacks of completely mechanical shafts, since it does not have low-efficiency mechanical elements which could result in seizing, as well as the drawbacks of completely pneumatic shafts, since the piston causes the gripping elements of the same section to emerge symmetrically without the possibility of asymmetry caused by unequal application of the load on the gripping elements.
  • the mechanical "tandem" coupling arrangement i.e. the fixed connection between the gripping elements of different sections of the shaft and the individual piston, obliges the gripping elements to emerge from the shaft all in unison.
  • the synchronised displacement of the gripping elements along the longitudinal extension of the shaft may cause problems if the bobbin core is not perfectly cylindrical or likely to yield (cardboard core).
  • the emerging movement of the gripping elements is interrupted as soon as a series of them, forming part of the same section, bears against the internal core of the bobbin wall: at that moment, the advancing movement of the piston is prevented by locking of this first section and hence also the travel of the other gripping elements is stopped at that point. The risk therefore exists that the core is not locked properly, the extreme situation being where the core is locked along a single section, but is loose along all the others.
  • the expandable shaft proposed by the Applicant intends, however, to solve fully the drawbacks of the known art, overcoming also the disadvantages of the patent mentioned above.
  • the object of the present invention is to provide a self-centring pneumatic/mechanical expandable shaft which ensures an independent movement of the gripping elements between one module and the next, maintaining a uniform movement of the gripping elements belonging to the same module, while ensuring a notable constructional simplicity and low production costs.
  • Another object of the present invention is to provide a pneumatic/mechanical expandable shaft which can be supplied with fluid under pressure at both its ends.
  • an expandable shaft for supporting bobbins being of the type comprising a hollow cylinder housing inside it a plurality of locking modules and having, corresponding with each of these modules, a plurality of openings distributed over the circumference of its surface, from which gripping elements for the bobbin are free to emerge, each module substantially being composed of a piston which is guided directly in the cavity of the cylinder and in which there are formed guides inclined with respect to the longitudinal axis of the shaft and each co-operating with a gripping element, a pressure chamber defined between the crown of the piston and a diaphragm fixed to the cylinder, and a resilient return element arranged between the bottom of the piston and diaphragm of the next module.
  • an expandable shaft of the type described above in which the diaphragms of the pressure chambers consist of the bottom of bell members inserted in the cylinder and inside which said piston partially slides, seals being provided between the side surface of the pistons and the internal surface of said bell members.
  • the expandable shaft according to the invention present a hollow cylinder 1 within which are inserted - respectively in the sequence described here - a resilient return element 2, such as a spiral spring, a piston 3 and a diaphragm fixed inside the cylinder 1 by means of a grub screw 5.
  • a resilient return element 2 such as a spiral spring
  • the diaphragm is the bottom of a closing bell member 4, the cylindrical walls of which partially act as a guide for the piston 3.
  • each module has only three constructionally fairly simple elements. This results in a reduction in the manufacturing times and costs as well as simple assembly, as will also emerge more clearly below, achieving one object of the invention.
  • the piston performs the dual function of pushing and guiding the gripping elements.
  • a plurality of grooves 9 which are inclined with respect to the longitudinal axis of the shaft (in Fig. 1 one is shown for each piston 3) are formed directly on the pistons 3, said grooves forming inclined guides for gripping elements or keys 10; the latter have an external surface parallel to the axis of the shaft, while the internal surface is inclined in the manner of a wedge.
  • the grooves 9 have a shape so as to form a long cage for a retaining element 11 sliding inside it and fixed to the key 10, for example by means of a bolt 13.
  • the key 10 emerges from a seat 12 of the cylinder 1 which guides its radial movement and prevents its movement along the axis of the shaft; therefore, sliding, inside the shaft, of the piston 3 and the associated grooves 9, imparts a radial movement to the retaining element 11, causing the key 10 to emerge from and retract into its seat 12.
  • the inclination of the grooves 9 is such that, during the forward movement of the piston 3, the keys 10 emerge, whereas during the backward movement of the piston 3 due to the action of the return spring 2, the keys 10 retract inside the cylinder 1.
  • each module may have passing through them a single rigid supply pipe 6.
  • the pipe 6 has openings 7 which introduce compressed air into chambers 8 formed between the crown of the pistons 3 and the bell members 4.
  • each chamber 8 has seals 8a and 8b respectively between the piston 3 and the bell member 4 and between the piston 3 and the pipe 6.
  • the coupling between the piston 3 and the bell member 4 is performed with a certain degree of play so that between the side surface of the piston 3 and the internal surface of the bell member 4 there nevertheless exists a certain gap inside which the seal 8a may easily operate.
  • the load of the bobbins supported by the expandable shaft is transmitted, via the keys 10 and the pistons 3, directly onto the internal surface of the hollow cylinder 1 without affecting at all the seals 8a and 8b which are thus able to work correctly and without excessive wear, to the benefit of the duration and reliability of the expandable shaft.
  • Assembly of the key 10 is performed by introducing pressure into the chamber 8 so as to bring the piston 3 into the forward position shown in Fig. 1; the retaining element 11 is then inserted into the groove 9 and the key 10 is then inserted into the associated seat 12, fixing it with the bolt 13 to a threaded hole in the retaining element 11 (Fig. 2). At this point the piston is able to move back owing to the action of the spring 2, causing the key to retract inside the shaft (Fig. 3). This assembly operation is performed separately for each module until assembly of the entire shaft has been completed.
  • the pistons 3 are connected in parallel on the same compressed-air supply line (the pipe 6), the power delivered by the compressor is supplied to each piston independently of the length of the expandable shaft so as to be able to manufacture shafts with a length of up to three metres without any difficulty.

Landscapes

  • Actuator (AREA)
  • Golf Clubs (AREA)
  • Supports For Plants (AREA)
EP97111752A 1996-07-17 1997-07-10 Arbre expansible à commande pneumatique Withdrawn EP0819643A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT96MI001480A IT1283440B1 (it) 1996-07-17 1996-07-17 Albero espansibile pneumomeccanico modulare
ITMI961480 1996-07-17

Publications (1)

Publication Number Publication Date
EP0819643A1 true EP0819643A1 (fr) 1998-01-21

Family

ID=11374602

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97111752A Withdrawn EP0819643A1 (fr) 1996-07-17 1997-07-10 Arbre expansible à commande pneumatique

Country Status (2)

Country Link
EP (1) EP0819643A1 (fr)
IT (1) IT1283440B1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0968775A2 (fr) * 1998-07-02 2000-01-05 Finsid S.r.l. Mandrin de bobinage expansible à auto-centrage
CN103043255A (zh) * 2012-12-27 2013-04-17 诸城晶品机械有限公司 全自动拉伸膜包装机拉伸膜预紧装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113460810B (zh) * 2021-07-29 2024-06-14 武汉淡雅香生物科技有限公司 一种活塞式内储能张紧轴

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4469288A (en) * 1983-02-28 1984-09-04 Double E Company Inc. Expansible shaft with actuator retaining member and spherical bearing surface
DE3533735A1 (de) * 1985-09-21 1987-04-16 Hanssmann Erich Aufspreizbare welle zur loesbaren halterung von rohrfoermigen wickelhuelsen und austauschbaren walzenkoerpern
EP0477137A1 (fr) * 1990-09-06 1992-03-25 Konrad Wandeler Arbre de bobinage ou tête de serrage pour le serrage de tubes

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4469288A (en) * 1983-02-28 1984-09-04 Double E Company Inc. Expansible shaft with actuator retaining member and spherical bearing surface
DE3533735A1 (de) * 1985-09-21 1987-04-16 Hanssmann Erich Aufspreizbare welle zur loesbaren halterung von rohrfoermigen wickelhuelsen und austauschbaren walzenkoerpern
EP0477137A1 (fr) * 1990-09-06 1992-03-25 Konrad Wandeler Arbre de bobinage ou tête de serrage pour le serrage de tubes

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0968775A2 (fr) * 1998-07-02 2000-01-05 Finsid S.r.l. Mandrin de bobinage expansible à auto-centrage
EP0968775A3 (fr) * 1998-07-02 2002-01-23 Finsid S.r.l. Mandrin de bobinage expansible à auto-centrage
CN103043255A (zh) * 2012-12-27 2013-04-17 诸城晶品机械有限公司 全自动拉伸膜包装机拉伸膜预紧装置

Also Published As

Publication number Publication date
ITMI961480A0 (fr) 1996-07-17
ITMI961480A1 (it) 1998-01-17
IT1283440B1 (it) 1998-04-21

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