EP3705432B1 - Dispositif annulaire à performance améliorée pour arbres de machines d'enroulement - Google Patents

Dispositif annulaire à performance améliorée pour arbres de machines d'enroulement Download PDF

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Publication number
EP3705432B1
EP3705432B1 EP20160871.8A EP20160871A EP3705432B1 EP 3705432 B1 EP3705432 B1 EP 3705432B1 EP 20160871 A EP20160871 A EP 20160871A EP 3705432 B1 EP3705432 B1 EP 3705432B1
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EP
European Patent Office
Prior art keywords
rings
engagement elements
balls
outer ring
sliding
Prior art date
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Active
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EP20160871.8A
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German (de)
English (en)
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EP3705432A1 (fr
Inventor
Andrea PETTINATI
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MEC Mechanical Engineering Consulting Srl
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MEC Mechanical Engineering Consulting Srl
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Publication of EP3705432A1 publication Critical patent/EP3705432A1/fr
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    • 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
    • B65H75/246—Expansible spindles, mandrels or chucks, e.g. for securing or releasing cores, holders or packages expansion caused by relative rotation around the supporting spindle or core axis
    • B65H75/247—Expansible spindles, mandrels or chucks, e.g. for securing or releasing cores, holders or packages expansion caused by relative rotation around the supporting spindle or core axis using rollers or rods moving relative to a wedge or cam surface

Definitions

  • the present invention relates to an innovative device for locking and winding coils of tape in multiple winding machines.
  • the invention also relates to a shaft with a plurality of such devices.
  • These devices comprise two concentric rings between which engagement elements are inserted, said engagement elements protruding from the outermost ring so as to engage with the cores which are fitted onto the shaft.
  • the outer ring can be rotated on the inner ring between an operating position and a rest position for locking or allowing radial movement of the engagement elements such as to engage or release the inner surface of the cores inserted on them.
  • the cores of the coils can slide along the shaft so that they may be inserted on or removed from them.
  • the cores of the coils are instead locked by the engagement elements so as to rotate together with the shaft.
  • the engagement elements are usually unable to retract fully within the outer ring because the rotation of the outer ring from and into the rest position is necessarily achieved by means of minimum engagement of these elements against the inside of the core fitted onto the shaft.
  • the resulting movement produced by the start of the shaft rotation is indispensable for automatically bringing all the devices on the shaft from the rest position into the working position.
  • JP2017-114597 discloses a device in which a sequence of balls is arranged between an innermost ring and an intermediate ring and the intermediate ring carries inclined planes on which other balls rest, these other balls slide on the inclined planes by the engagement with the outermost ring.
  • the sequence of balls creates a ball bearing which serves to facilitate the rotation of the entire device on the shaft.
  • the projection of the engagement elements from the ring also in the rest position even if it is attempted to keep it as small as possible (for example even only equal to about a tenth of a millimetre), entails various drawbacks.
  • the engagement elements rub against the inner surface of the cores during the insertion and removal of the cores on the shaft, and this causes both undesirable scoring of this surface and the generation of dust (especially in the case of cardboard cores) which is not only damaging for the mechanisms of the winding machines, but is also unacceptable in the case of winding machines used for food products. This latter condition especially may prevent the use, in the food industry, of automatic unloading and loading winding machines and/or cardboard cores.
  • the projection of the engagement elements during the insertion and the removal of the cores on the shaft also causes jumping and jamming of the cores which is detrimental for the loading and unloading operations, above all in the case of automatic loading and unloading systems.
  • a further drawback of the known systems is that it is often necessary to manufacture at least the outer ring or both rings using steel.
  • the working life of the known devices may however be relatively limited and fairly frequent maintenance may be required to prevent the number of jamming situations from increasing excessively over time.
  • a further drawback of the prior art is the relative complexity of the device, which requires a relatively large number of parts which are not simple to machine and are relatively complicated to assemble.
  • the inner ring is provided with a side shoulder which protrudes radially outwards and on which there rests a corresponding side face of the outer ring which is axially inserted on the inner ring while at the same time all the engagement elements must be housed between the rings.
  • a round rim is then fixed on the opposite face of the inner ring and locked in place with a plurality of screws distributed circumferentially along the rim. All this results in various ring machining operations and a not insignificant amount of wasted material (for example, due to the turning of the inner ring in order to form as one piece the shoulder which protrudes radially from the finished part).
  • the general object of the present invention is to overcome the drawbacks of the prior art by providing an improved annular device for winding machines.
  • the device is intended to be arranged alongside a plurality of same annular devices in order to form a winding shaft in a winding machine, and it comprises a concentric inner ring and outer ring, and engagement elements which emerge through slots on the peripheral surface of the outer ring, the outer ring being rotatable with respect to the inner ring between a first angular rest position, in which the engagement elements may be retracted into the outer ring by a first amount, and a second angular operating position, in which the engagement elements may be retracted by an amount less than in the first angular rest position.
  • At least one circumferential interspace containing a series of balls for relative sliding of the two rings is present between the inner ring and the outer ring.
  • a shaft assembly for winding coils on coil cores in a multiple winding machine comprising a shaft on which a plurality of annular devices realized according to claim 1 are inserted, being arranged coaxially side-by-side along the shaft so as to accommodate on them cores of coils to be wound.
  • Figure 1 shows an annular locking device, denoted generally by 10, intended to be mounted on a winding shaft 17 of a known winding machine (not shown here or described in detail since it is well known per se and may be easily imagined by the person skilled in the art).
  • Several annular devices 10 are intended to be mounted side-by-side on the shaft 17 using systems known in the sector and therefore not shown since they may be easily imagined by the person skilled in the art, in order to accommodate one or more cores inserted onto the devices 10 so as to be controllably locked to the shaft 17 of the winding machine.
  • a shaft assembly for a winding machine, formed by a plurality of devices according to the invention mounted on a rotation shaft, is thus provided (by way of example, a second device according to the invention is shown in broken lines in Figure 1 ).
  • the device 10 comprises an inner ring 11 and an outer ring 12 coaxial with each other.
  • Engagement elements 13 emerge from the peripheral cylindrical surface 15 of the outer ring through shaped seats or slots 14 arranged at - preferably equidistant - intervals around the circumference of the ring.
  • the engagement elements 13 are movable radially with respect to the rings depending on the relative angular position of the two rings, which can be rotated relative to each other between a first angular rest position and a second angular locking position.
  • the engagement elements 13 In the first angular rest position, the engagement elements 13 are radially retracted or elastically retractable, while in the second angular position the engagement elements 13 are retractable or retracted by an amount less than in the first angular rest position.
  • the cores of the coils to be wound may be slid axially along the shaft, while in the second position they are constrained to rotate together with the annular devices, as known to the person skilled in the art.
  • the engagement elements are completely retracted and do not protrude from the surface 15 of the outer ring.
  • the seats 14 narrow towards the exterior of the device so as to allow the engagement elements 13 to move radially in the seats but without being able to come out completely from the device through these seats.
  • the engagement elements are preferably balls, advantageously arranged in adjacent pairs or in any case on two circumferences of the cylindrical surface 15 which are axially spaced so as to define between them a central annular strip, as is clear in the drawings.
  • the device 10 has the inner ring 11 with a peripheral surface which forms for each engagement element 13 a sliding surface 19 with a variation in height in the support of the corresponding engagement element 13 with respect to the outer ring so that at one end 20 of the sliding surface (corresponding to the angular rest position) the element 13 can retract more than at the opposite end 21.
  • the sliding surface 19 can be formed by a tear-shaped groove 19, i.e. with side walls which converge from the end 20 to the end 21 on the surface of the inner ring, so as to form a channel with decreasing width and to move correspondingly closer together the two points making contact on the surface of the ball during sliding along the groove 19 and thus lift the ball.
  • each ball may slide in a channel having a constant width but with a depth of the channel which varies from one end to the other.
  • a stop allows relative rotation of rings 11 and 12 only through a small angle, corresponding to sliding of the engagement elements 13 between the first and second ends of the sliding surface 19.
  • the stop may be formed by a locking element 22 which protrudes from one ring so as to be inserted and to slide in a circumferential recess 23 of suitable length formed on the facing peripheral surface of the other ring.
  • the locking element 22 may be in the form of a ball, which is received inside a seat 24 so as to slide along the circumferential recess 23 upon rotation of the rings.
  • the seat 24 may be extended to form a passage from the lateral periphery of the outer and/or inner ring towards the circumferential recess 23, so as to allow the passage of the locking element 22 during a relative movement of the two rings in their axial direction.
  • the passage 24 may be a half-channel with a circular cross-section formed on the inner face of the outer ring 12 so as to intersect the circumferential slot 23 formed on the outer surface of the inner ring 11.
  • the locking element 22 For the assembly of the two rings, it is sufficient to insert the locking element 22 into the recess 23 and slide the two rings one on top of the other after arranging them in a relative angular position about the common axis so that the locking element 22 may simultaneously slide along the passage 24.
  • Figure 3 shows clearly how the surface 19 makes the engagement elements 13 protrude more or less when the rings are rotated relative to each other. This figure also clearly shows how the locking element 22 inside the recess 23 limits the degree of rotation.
  • annular interspace 25 is formed between the two inner and outer rings and receives a circumferential series of sliding balls 26 around the whole circumference of the inner ring, which thus form a circumferential row of balls 26.
  • the annular interspace is advantageously formed by a circumferential groove in the inner face of the outer ring and by a corresponding circumferential facing groove in the outer face of the inner ring so as to form the two halves of an interspace with a generally circular cross-section inside which the balls 26 are received so as to form a substantially continuous circumferential sequence (i.e. with only a small play between the balls to allow rotation thereof inside the groove).
  • the diameters of the facing surfaces of the two rings and the diameters of the balls 26 are such as to maintain a small space between the rings in a radial direction so that they do not touch each other during their relative rotation, but slide on the balls.
  • the fact that the balls 26 are free to roll and slide in the continuous circumferential interspace allows the rings to rotate without the need for any further element.
  • the sliding balls 26 may be introduced into the interspace between the rings through a radial hole 27 which is formed in one of the rings and which leads into the interspace.
  • the hole 27 is formed in the outer ring. Once the balls are introduced into the interspace, the hole 27 can be closed with a suitable plug 28.
  • the device according to the invention can be easily made with few parts. For example, it is possible to keep the two rings assembled together simply by means of the action of the sliding balls arranged in the interspace between the rings.
  • the two halves of the interspace formed as grooves in the rings are sufficiently deep to prevent an axial displacement of the rings with respect to each other, as is clear for example from Figure 2 . No additional components are therefore necessary.
  • the engagement elements 13 are arranged in the ends 20 of the surfaces 19, so that they are retracted as far as possible.
  • the dimensioning of the engagement elements and the rings will be such as to allow the relative sliding of the two rings on each other (making use also of the radial play between the rings), as may now be easily imagined by the person skilled in the art.
  • the locking element 22 may also be inserted in its seat, as already described above.
  • the interspace 25 may be substantially filled with sliding balls 26 through the hole 27 and the hole can then be plugged.
  • the double circumference of engagement elements 13 gives stability to the coupling between the two rings, preventing a significant inclination between the axes of revolution of the two rings, said axes thus always coinciding.
  • the device according to the invention has the outer ring which can roll on the inner ring with minimum effort, owing to the balls 26. This ensures, for example, that the small friction produced between a core fitted onto the shaft with the devices of the invention is sufficient to allow the rotation of the device between the rest position and operating position, without the need in the rest position for the engagement elements to protrude from the outer face of the outer ring. These engagement elements may therefore be fully retracted within the seats 14 when the device is in the rest position, as can be clearly seen for example in Figure 2 .
  • FIG. 5 shows schematically a variant of a device according to the invention.
  • this variant has parts which are similar to those of the previous embodiment denoted by the same numerals increased by 100.
  • Figure 5 is formed by an annular locking device, generally denoted by 110, which is intended to be mounted on a winding shaft 17 of a known winding machine (not shown here or described in detail since it is well known per se and may be easily imagined by the person skilled in the art).
  • the device 110 comprises an inner ring 111 and an outer ring 112 coaxial with each other.
  • Engagement elements 113 emerge from the peripheral cylindrical surface 115 of the outer ring through shaped seats or slots 114 arranged at intervals, which are preferably equidistant, around the circumference of the ring.
  • the engagement elements 113 are movable radially with respect to the rings depending on the relative angular position of the two rings owing to variable-depth sliding surfaces 119.
  • Each surface 119 has an end 120 (corresponding to the angular rest position of the device) which is less distant from the axis of the ring and an opposite end 121 (corresponding to the angular operating position of the device) which is more distant from the axis of the ring than the first end 120.
  • the engagement elements 113 are therefore movable so as to protrude more or less from the respective seats 114 depending on the relative angular position of the two rings, as already described above for the engagement elements 13.
  • the seats 114 narrow towards the exterior of the device so as to prevent the engagement elements 113 from coming out completely from their seats.
  • the engagement elements are cylindrical elements with their axis parallel to the axis of the rings.
  • these cylindrical elements may also have rounded bases (advantageously semispherical), as shown in the drawings, and the seats will in this case be correspondingly shaped. In this way the cylinders have no sharp edges in the axial direction with respect to the device and possible damage to the cores is avoided.
  • the cylindrical elements which are rounded on the bases may also advantageously be free to tilt slightly in order to adapt better to the cores.
  • Each interspace 125 may be formed in the same way as already described above for the interspace 25, as may now be easily imagined by the person skilled in the art.
  • the balls 126 can be inserted into the respective interspaces 125 through a corresponding hole 127 which is then closed with a suitable plug 126, as already described above for the balls 26.
  • a stop is used to limit the rotation of one ring with respect to the other one between the two rest and operating positions of the device.
  • the stop may also be arranged between the two rows of balls 126 in a free space between the surfaces 119 for actuating the movement of the cylindrical elements 113.
  • the stop may be formed with a locking element 122 which protrudes from one ring so as to be inserted and slide in a circumferential recess 123 of suitable length formed on the facing peripheral surface of the other ring.
  • the locking element 122 may be a pin which may, for example, protrude inside the outer ring in the radial direction so as to be inserted in the recess 123 formed in the outermost surface of the inner ring.
  • the pin 122 is inserted from the outer surface 115 of the outer ring through a special hole 124 inside which it is locked (for example by mean of screwing, gluing, etc.).
  • the locking element 122 may also be a ball which is inserted through hole 124 (subsequently plugged) and has a suitable size so as to remain partially inside the hole 124 and partially inside the recess 123.
  • the assembly of the device 110 is substantially similar to that of the device 10. Once the engagement elements 113 have been positioned, the two rings are inserted axially one inside the other and the balls 126 are inserted through the respective holes 127 which are then plugged. The rotation stop element 122 is inserted into the hole 124 so as to enter into the recess 123.
  • the device is thus rapidly assembled. If it is to be disassembled, it is sufficient to remove the balls 126 and the stop 122 and the rings may be once again extracted from each other. It is clear at this point how the objects of the invention have been achieved.
  • the core sliding, supporting and locking operations are facilitated and more reliable than in the known solutions.
  • the cores are kept intact and, if the engagement elements are designed so as to be completely retracted in the rest position, there is for example no production of dust.
  • the device according to the invention is therefore suitable also for the use of cardboard cores for alimentary purposes and also in the case of automatic systems for insertion and extraction of the cores onto/from the shaft of the winding machine. Owing to the sliding balls, the relative rotation of the two rings is facilitated and even only the slightest friction between the outer ring and the core is sufficient to produce the rotation of the device around the rest position, even with the engagement elements completely retracted.
  • the outer rings may be easily made from a cylindrical tube with an inner wall in which a part of the interspace for receiving the sliding balls is formed.
  • the inner rings may be easily made from a cylindrical tube with an outer wall in which a part of the interspace for receiving the sliding balls and sliding surfaces of the engagement elements upon rotation of the rings are rotated between said two rest and operating positions is formed.
  • the radial thickness of the device may also be kept very small and this facilitates, for example, the manufacture of devices suitable for mounting cores with a small diameter or in any case with a small difference in diameter with respect to the rotating shaft.
  • the engagement elements may be arranged centrally and two series of sliding balls may be used on the sides or in the opposite arrangement.
  • two rows of sliding balls as described for device 110 but with spherical engagement elements, as described for the device 10, and also in a single circumferential line in the centre of the two rows of sliding balls, may be used.
  • the opposite arrangement is also possible, if the desired width of the rings allows it.
  • the engagement elements and the surfaces for their movement between the two rest and operating positions may have a shape different from that shown and may, for example, be made according to other types known in the sector.
  • the shaft assembly formed by a rotation shaft and a plurality of devices according to the invention may also include further known mechanisms, such as for example known pneumatic systems for locking the devices on the shaft.

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  • Winding Of Webs (AREA)

Claims (11)

  1. Dispositif de verrouillage annulaire (10, 110) avec bobines d'enroulement, prévues pour être agencées le long d'une pluralité de dispositifs annulaires similaires afin de former un arbre d'enroulement dans une machine d'enroulement, comprenant une bague interne concentrique (11, 111) et une bague externe (12, 112) et des éléments de mise en prise (13, 113) qui sortent par les fentes (14, 114) sur la surface périphérique de la bague externe, la bague externe pouvant tourner par rapport à la bague interne entre une première position de repos angulaire, dans laquelle les éléments de mise en prise (13, 113) peuvent être rétractés dans la bague externe selon une première quantité et une seconde position de fonctionnement angulaire, dans laquelle les éléments de mise en prise (13, 113) peuvent être rétractés selon une quantité inférieure à celle dans la première position de repos angulaire, au moins un espace intermédiaire circonférentiel (25, 125) contenant une série de billes (26, 126) pour le coulissement relatif des deux bagues est présent entre la bague interne (11, 111) et la bague externe (12, 112), caractérisé en ce que la bague externe est un tube cylindrique avec une paroi interne dans laquelle une partie de l'espace intermédiaire pour recevoir les billes de coulissement est formée et la bague interne est un tube cylindrique avec une paroi externe dans laquelle une partie de l'espace intermédiaire pour recevoir les billes de coulissement et les surfaces pour le coulissement des éléments de mise en prise suite à la rotation des bagues entre lesdites deux positions de repos et de fonctionnement sont formées.
  2. Dispositif annulaire selon la revendication 1, caractérisé en ce que dans la première position de repos, les éléments de mise en prise (13, 113) peuvent être complètement rétractés dans la bague externe afin de ne pas faire saillie de la surface périphérique de la bague externe.
  3. Dispositif annulaire selon la revendication 1, caractérisé en ce que les éléments de mise en prise (13) sont formés par les billes.
  4. Dispositif annulaire selon la revendication 1, caractérisé en ce que les éléments de mise en prise (113) sont des cylindres avec des bases rondes et un axe parallèle à l'axe des bagues.
  5. Dispositif annulaire selon la revendication 1, caractérisé en ce que les éléments de mise en prise sont agencés le long des deux circonférences des bagues avec, dans le centre, l'espace intermédiaire circonférentiel (25) contenant les séries de billes pour le coulissement relatif des deux bagues.
  6. Dispositif annulaire selon la revendication 1, caractérisé en ce que les espaces intermédiaires circonférentiels (125) contenant la série de billes pour le coulissement sont au nombre de deux avec les éléments de mise en prise dans le centre.
  7. Dispositif annulaire selon la revendication 1, caractérisé en ce que la série de billes est introduite dans l'espace intermédiaire par un trou radial dans l'une des bagues.
  8. Dispositif annulaire selon la revendication 1, caractérisé en ce que la série de billes à l'intérieur de l'espace intermédiaire empêche le dégagement axial des bagues l'une par rapport à l'autre.
  9. Dispositif annulaire selon la revendication 1, caractérisé en ce qu'entre la bague interne (11, 11) et la bague externe (12, 112), il y a une butée pour une rotation relative limitée des bagues.
  10. Dispositif annulaire selon la revendication 9, caractérisé en ce que la butée comprend un évidement (23, 123) s'étendant de manière circonférentielle dans l'une des deux bagues et un élément coulissant dans ledit évidement et raccordé à l'autre bague.
  11. Ensemble d'arbre pour enrouler des bobines sur des âmes de bobine dans une machine d'enroulement, comprenant un arbre (17) sur lequel une pluralité de dispositifs annulaires (10, 110) réalisés selon l'une quelconque des revendications précédentes, sont insérés, agencés de manière coaxiale côte à côte le long de l'arbre pour accueillir sur ce dernier, les âmes de bobines à enrouler.
EP20160871.8A 2019-03-05 2020-03-04 Dispositif annulaire à performance améliorée pour arbres de machines d'enroulement Active EP3705432B1 (fr)

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IT201900003153 2019-03-05

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EP3705432A1 EP3705432A1 (fr) 2020-09-09
EP3705432B1 true EP3705432B1 (fr) 2023-06-07

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Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0213545A (ja) * 1988-06-29 1990-01-17 Masaru Kawasaki 巻取り軸
JP4240518B2 (ja) * 1999-10-07 2009-03-18 株式会社片岡機械製作所 フリクション式シート巻軸の巻取カラー
JP6955663B2 (ja) * 2015-12-22 2021-10-27 株式会社片岡機械製作所 巻取カラー

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