EP0819644A1 - Arbre expansible avec barres à centrage automatique - Google Patents

Arbre expansible avec barres à centrage automatique Download PDF

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Publication number
EP0819644A1
EP0819644A1 EP97111754A EP97111754A EP0819644A1 EP 0819644 A1 EP0819644 A1 EP 0819644A1 EP 97111754 A EP97111754 A EP 97111754A EP 97111754 A EP97111754 A EP 97111754A EP 0819644 A1 EP0819644 A1 EP 0819644A1
Authority
EP
European Patent Office
Prior art keywords
shaft
blocks
modules
expandable
piston
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Withdrawn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
EP97111754A
Other languages
German (de)
English (en)
Inventor
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 EP0819644A1 publication Critical patent/EP0819644A1/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Withdrawn legal-status Critical Current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 or claws, emerging from its external surface and apt to grip the core of the bobbin, when they are in the extracted position, and to allow disengagement thereof from the shaft, when they are in the retracted position.
  • gripping elements such as movable blocks or claws
  • the blocks are made to emerge by means of devices which transform, via the engagement of inclined surfaces, the displacement of an actuating element along the longitudinal axis of the shaft into a radial displacement of the blocks, which allows them to emerge or retract from the surface of the same shaft.
  • This solution is preferred since a synchronised radial movement is imparted to the blocks, so that all the blocks emerge by the same amount, resulting in self-centring of the bobbin on the shaft and hence on the axis of rotation.
  • the spines extend longitudinally over nearly the whole of the shaft.
  • Spline-type shafts thus provide the possibility of supporting bobbins of several lengths, including lengths less than that which would be the standard pitch between one block and the next in block-type shafts.
  • the radial displacement of the splines is performed with a purely pneumatic system in which each spine is extracted/retracted by the action of an expandable cushion located underneath the cushion itself.
  • the expandable cushions are housed in longitudinal seats formed in the surface of the shaft and are inflated with compressed air introduced via suitable ducts and check valves.
  • Pneumatic expandable shafts suffer from certain drawbacks. Among the most important of these, mention must be made of the practical impossibility of achieving self-centring of the bobbin on the shaft.
  • the expandable cushions are deformed differently from one another depending on the load applied to each of them, such that the splines which are stressed more in a given instant, in particular under static conditions, emerge from the shaft to a lesser extent than the spines which are less stressed. This results in the spines emerging in an asymmetrical manner, thus adversely affecting centring of the bobbin on the axis of rotation.
  • An object of the present invention is therefore that of providing a spline-type expandable shaft which is self-centring.
  • a further object of the present invention is that of reducing the impact of the spline seats on the structural strength of the shaft and reducing the costs of forming the said seats.
  • an expandable shaft for supporting bobbins 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 short openings distributed circumferencially over its surface, through which retractable blocks are made to emerge, each module having an axially slidable thrusting element which engages with said blocks by means of surfaces inclined with respect to the longitudinal axis of the shaft, a semirigid spline which extends longitudinally over most of the length of the shaft being fixed externally on each plurality of blocks of the modules which correspond to one another in an axial alignment.
  • the expandable shaft according to the invention is substantially composed of a hollow cylinder 1 which has housed inside it a plurality of locking modules M i , M i+1 , etc. which are repeated in an identical manner along the longitudinal extension of the shaft, each of which has a certain number of retractable blocks 2, for example three or five equally distributed on the circumference of the cross-section, emerging from as many openings or seats 3 formed in the thickness of the cylinder 1.
  • the seats 3 are designed so as to allow only the radial movement of the blocks 2, while preventing the movement thereof along the longitudinal axis of the shaft.
  • the longitudinally aligned retractable blocks 2 of the different modules are fixed externally to a gripping spine 4. Therefore, the gripping pressure imparted onto the internal surface of the core of a bobbin (not shown) mounted on the shaft is exerted by the splines 4 which, being made of substantially rigid material, move in unison with the underlying blocks 2, while retaining a certain local adaptability.
  • Each module has, moreover, an axially slidable thrusting element 5 which engages with the inner side of the blocks 2 by means of surfaces inclined with respect to the sliding axis of the thrusting element itself.
  • the thrusting element 5 may be in the form of a cone or, preferably, may be cylindrical and have an inclined groove 6 inside which a guide element (not visible) fixed to the block 2 slides.
  • Each spline in its rest position, partially retracts into a respective longitudinal seat 6 so as to produce a certain degree of play between the shaft and the bobbin core, which allows mounting of the latter on the shaft.
  • these seats 6 are less deep than those of the corresponding pneumatic shafts, having to receive only the thickness of the splines 6. Only at the location of the blocks, which however are of limited length, do the seats 3 pass entirely through the thickness of the cylinder 1.
  • Axial sliding of the thrusting elements 5 may be produced, in accordance with an entirely mechanical system, by means of an endless screw, indicated schematically in Fig. 1 by the reference number 7 or, preferably, in accordance with a system typical of pneumatic/mechanical shafts, using pneumatic means.
  • each thrusting element 5 is in the form of a piston 50 (Fig. 3) which is displaced by the opposing action of a fluid under pressure, introduced from a single axial duct 70 into pressure chambers 80 delimited by the crown of the pistons 50 and by diaphragms 90, and a return spring 100, in accordance with a design disclosed in the Italian Patent Application No. MI96A001480 filed on 17/7/96 in the name of the same Applicant and which is considered as being included herein as a reference for better understanding of the present invention.
  • MI96A001480 filed on 17/7/96 in the name of the same Applicant
  • the present invention involves a series of advantages which totally overcome the drawbacks of the known art.
  • the splines 4, at the location of each module M i are guided "mechanically" by the blocks 2 co-operating with a same thrusting element 5 which imposes on them a synchronous radial movement.
  • the blocks 2 of the same module M i are all pushed simultaneously outwards by the action of the thrusting element 5 which therefore prevents the blocks emerging to different extents depending on the load applied to each of them. Under these conditions, self-centring of the bobbin on the axis of rotation is ensured, even under static conditions, achieving one of the objects of the invention.
  • the seats 3 which pass through the entire thickness of the hollow cylinder 1 have a limited length since they serve for emergence of the blocks 2 and not the splines 4 as in the known art.
  • the seats 6 of the splines 4 are not very deep and, in particular, do not pass through the entire thickness of the cylinder 1.
  • the volume of material removed by means of milling is substantially limited, compared to corresponding pneumatic shafts, such that a saving is obtained also in terms of machining time and duration of the tools, resulting, as an implicit consequence, in savings from a cost point of view.

Landscapes

  • Discharge By Other Means (AREA)
  • Replacement Of Web Rolls (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)
  • Bearings For Parts Moving Linearly (AREA)
EP97111754A 1996-07-17 1997-07-10 Arbre expansible avec barres à centrage automatique Withdrawn EP0819644A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT1996MI000512U IT242551Y1 (it) 1996-07-17 1996-07-17 Albero espansibile per il supporto di bobine dotato di listelli dipresa autocentranti
ITMI960512U 1996-07-17

Publications (1)

Publication Number Publication Date
EP0819644A1 true EP0819644A1 (fr) 1998-01-21

Family

ID=11373645

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97111754A Withdrawn EP0819644A1 (fr) 1996-07-17 1997-07-10 Arbre expansible avec barres à centrage automatique

Country Status (2)

Country Link
EP (1) EP0819644A1 (fr)
IT (1) IT242551Y1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2388886A (en) * 2002-05-23 2003-11-26 Creative Patent Ltd Expanding shaft
WO2021209513A1 (fr) * 2020-04-15 2021-10-21 Oerlikon Textile Gmbh & Co. Kg Broche pour dispositif d'enroulement de bobine

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB262911A (en) * 1925-11-23 1926-12-23 Goss Printing Press Co England Improvements in or relating to shafts or spindles particularly for supporting paper supply rolls in printing presses
AU470483B1 (en) * 1970-05-05 1972-11-02 Bellmann John Improvements relating to expandable shafts
DE3533735A1 (de) * 1985-09-21 1987-04-16 Hanssmann Erich Aufspreizbare welle zur loesbaren halterung von rohrfoermigen wickelhuelsen und austauschbaren walzenkoerpern

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB262911A (en) * 1925-11-23 1926-12-23 Goss Printing Press Co England Improvements in or relating to shafts or spindles particularly for supporting paper supply rolls in printing presses
AU470483B1 (en) * 1970-05-05 1972-11-02 Bellmann John Improvements relating to expandable shafts
DE3533735A1 (de) * 1985-09-21 1987-04-16 Hanssmann Erich Aufspreizbare welle zur loesbaren halterung von rohrfoermigen wickelhuelsen und austauschbaren walzenkoerpern

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2388886A (en) * 2002-05-23 2003-11-26 Creative Patent Ltd Expanding shaft
GB2388886B (en) * 2002-05-23 2005-09-07 Creative Patent Ltd Pneumo-mechanical expanding shaft
WO2021209513A1 (fr) * 2020-04-15 2021-10-21 Oerlikon Textile Gmbh & Co. Kg Broche pour dispositif d'enroulement de bobine

Also Published As

Publication number Publication date
IT242551Y1 (it) 2001-10-02
ITMI960512U1 (it) 1998-01-17
ITMI960512V0 (fr) 1996-07-17

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