EP1013585A1 - Dispositif d'alimentation d'une bande - Google Patents

Dispositif d'alimentation d'une bande Download PDF

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Publication number
EP1013585A1
EP1013585A1 EP98830783A EP98830783A EP1013585A1 EP 1013585 A1 EP1013585 A1 EP 1013585A1 EP 98830783 A EP98830783 A EP 98830783A EP 98830783 A EP98830783 A EP 98830783A EP 1013585 A1 EP1013585 A1 EP 1013585A1
Authority
EP
European Patent Office
Prior art keywords
web material
speed
driving means
web
accordance
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Withdrawn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
EP98830783A
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German (de)
English (en)
Inventor
Paolo Pasqualoni
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.)
Fameccanica Data SpA
Original Assignee
Fameccanica Data SpA
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 Fameccanica Data SpA filed Critical Fameccanica Data SpA
Priority to EP98830783A priority Critical patent/EP1013585A1/fr
Publication of EP1013585A1 publication Critical patent/EP1013585A1/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Withdrawn legal-status Critical Current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
    • B65H20/00—Advancing webs
    • B65H20/30—Arrangements for accumulating surplus web
    • B65H20/32—Arrangements for accumulating surplus web by making loops
    • B65H20/34—Arrangements for accumulating surplus web by making loops with rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/042—Sensing the length of a web loop

Definitions

  • the present invention relates to systems for supplying moving web material in accordance with the preamble of Claim 1 hereinbelow.
  • a system of this type is known - for example - from US-A 3 995 791.
  • This document describes a system for the continuous supply of moving web material, the system in question consisting, inter alia, of two stations intended to accommodate the rolls from which the web material is to be paid out.
  • the web is taken alternatively from one or the other of the said stations, matters being arranged in such a manner that the expiring end of the web from a dispensing roll in one station is spliced to the beginning of the web from a ready roll carried in the other station, thus avoiding solutions of continuity in the supply (payout) of the web.
  • the system in question includes a web storage device in the form of a so-called web festooner.
  • the said web storage device When web supply is to be switched from one roll-carrying station to the other and the two web ends have to be spliced together, the said web storage device is brought into action in a positive manner by mechanical means in synchrony and in phase with a set of rollers that feed the web material towards the utilization station.
  • the speed at which the web material is paid out on the output side of the system therefore stands in a fixed mechanical relationship with the speed at which the web is utilized, and this makes it possible to bring the motion of the web to a halt upstream of the web storage device, so that the two web sections can be spliced in what are to all intents and purposes conditions of standstill.
  • the system is set in motion again and the web storage device begins to reconstitute a certain web reserve contained in its interior, thus making possible a subsequent roll switching and web splicing operation in exactly the same conditions as have just been described.
  • the said mechanism not only causes a gradual slowdown of the speed with which the web is moved in the splicer (bringing it to a complete standstill), but also brings into action the driving means associated with the web storage unit. This is done in such a manner that, even during the period of time needed to complete the splicing of the web, the supply needs of the utilization station at the downstream end are satisfied by a length of web material taken from the storage device.
  • the web material in the splicer is gradually re-accelerated, while the driving means of the web storage device are gradually slowed down, these processes being continued until the re-establishment of the normal operating conditions in which the supply needs of the downstream utilization station can be satisfied directly by web material passing through the splicer.
  • the driving means of the web storage device are activated again, but this time in the direction opposite to the previous one, so that the web storage unit can gradually build up a new web reserve.
  • the deceleration/acceleration of the web motion at the splicer are piloted in a rigid manner via a cam mechanism, so that - for example - it is not readily possible to modify the applied acceleration and deceleration laws to take account of possible variations of the operating parameters (size and moment of inertia of the web rolls, etc.).
  • the fundamental parameter for controlling the operation of the system is the rate (speed) at which the utilization station situated downstream of the web storage device absorbs the web. Both the speed of the web in the splicer and the speed of the driving means of the web storage device are controlled as functions of this absorption rate, though always in the previously described rigid manner.
  • Another drawback - and one that is extremely penalizing whenever the web material in use is of a delicate nature - is constituted by the fact that the part of the web comprised between the splicer and the unit that feeds the web to the downstream station has to be dragged in a positive manner between these two points and also in the web storage unit. Any instantaneous difference of speed between the various moving parts will therefore inevitably become translated into a longitudinal tensile stress acting on the web.
  • a solution of the previously described type can therefore prove to be generally satisfactory from the functional point of view only for as long as one is concerned with relatively low web payout speeds at the output side (generally less than 150 m/s) and web materials of relatively good tensile strength characteristics to enable them to withstand the traction forces, polyethylene and nonwoven tissue being two cases in point.
  • the system described in the previously cited US-A-3 995 791 is intrinsically bound up with the possibility of having to function in combination with a splicer intended to operate in standstill conditions (that is to say, in accordance with what are nowadays known as "zero speed” modalities).
  • the state-of-the-art system as previously described does not therefore constitute a self-contained unit capable of performing its function of supplying web material in a controlled manner, complete with storage capacity, in an autonomous manner.
  • the said system is de facto designed and realized as a function of the processing stations situated upstream (splicer) and downstream (utilization station) of it.
  • Such a device conceived to operate with a splicer that works in "zero speed” conditions, cannot be adapted to enable it to function also with a splicing system capable of working in dynamic conditions, i.e. without bringing the web to a standstill, except on the basis of a complete reconfiguration.
  • the previously examined state-of-the-art system does not therefore lend itself to being used for retrofitting operations involving already existing installations.
  • the present invention sets out to provide a device of the type specified hereinabove such as to overcome the drawbacks associated with the state-of-the-art systems and thus to provide a wholly satisfactory answer to the various needs just discussed.
  • this scope can be attained by a device for the continuous supply of web materials having the additional characteristics set out in the claims hereinbelow.
  • the reference number 1 in the figures and drawings attached hereto indicates the whole of a device capable of being used for supplying web material in a controlled manner and with storage capacity.
  • the web material which is indicated by the letter W, may be - inter alia - a web material (sometimes also referred to as "fabric") to be used for the production of sanitary and hygienic products, including those of the previously mentioned type.
  • the web material W may be constituted by a material such as cellulose wadding ("tissue") that has very limited resistance to mechanical stresses, especially tensile stresses in the longitudinal direction.
  • tissue cellulose wadding
  • the device 1 is essentially configured as a module intended to be inserted between processing stations on its upstream and downstream side in the general context of a plant for the processing and/or handling of web material.
  • the device 1 may be located on the downstream side of a supply unit made up of a pair of stations intended to carry the respective rolls B1, B2 of web material, the said stations being associated with a splicer S to be used for making the joints between successive lengths of web material, which is taken in alternating sequence from the said two rolls.
  • a supply unit made up of a pair of stations intended to carry the respective rolls B1, B2 of web material, the said stations being associated with a splicer S to be used for making the joints between successive lengths of web material, which is taken in alternating sequence from the said two rolls.
  • the arrangement of the said supply unit may be substantially analogous to the one illustrated in US-A-3 995 791, a document already repeatedly referred to hereinabove.
  • any type of utilization station employing the web material W may be situated on the downstream side of the device 1.
  • the said station (which is not illustrated here) may employ a typical "in line" process to pair the web material W with other web materials to form a chain of hygienic and sanitary products intended to be separated by means of a subsequent chain segmentation operation, thus giving rise to individual products.
  • the invention aims at realizing a device capable of receiving at its intake side (i.e. the position generically indicated by the reference number 2 on the drawings annexed hereto) a web material W that is being supplied to it at a given input speed.
  • This input speed may be selectively varied, this even to the point of completely zeroing the said speed and thus bringing the incoming supply of the web W temporarily to a standstill.
  • the device 1 seeks to make the web material W available at its output side (i.e.
  • the device 1 consists of a vertical supporting panel 4 that may be constituted either by a frame or a single member of solid structure, usually realized as steelwork. Fixed to the supporting panel 4, in the solution here illustrated more or less in a central or midway position, there is a solid cage 5 that carries, likewise in a fixed position with respect to the support 4, a first set of rollers 6 (the set consisting of five such rollers in the particular embodiment here illustrated).
  • the rollers 6 are here represented as capable of rotating freely around a horizontal axis.
  • the cage 5 projects from the supporting panel 4 in a horizontal direction, the general arrangement being that of a bracket (or shelf). Likewise mounted on the said supporting panel 4 there is a series of vertical guide rails 4a on which there is mounted a sliding trolley 7 that in the vertical direction extends to above the cage 5. On the trolley 7, in turn, there is mounted a certain number of rollers 8 (there being four such rollers in the particular embodiment here illustrated), which can once again rotate freely on a horizontal axis and are located above the rollers 6 carried by the cage 5.
  • the rollers 8 are arranged in such a manner that, as seen in plan, each one of them is positioned midway between two of the rollers 6 carried by the cage 5.
  • the number of rollers 8 will always be one less than the number of rollers 6.
  • the trolley 7 (and therefore also the rollers 8 mounted on it) can move along the guide rails 4a under the action of the driving means 9, which - just like the other driving and sensor organs subsequently to be described herein - are controlled by a central processing unit 10, for example, a so-called PLC (acronym for "Programmable Logic Controller”).
  • the driving means 9, for example, can be an electric motor (of known type and characteristics) that acts via an appropriate reduction gear 11 on an endless screw 12 that engages with a female thread (not shown) provided on the trolley 7.
  • the trolley 7 can therefore be selectively lowered or raised (and therefore be brought either closer to the cage 5 or moved further away therefrom), which has the effect of varying the distance that separates the set of rollers 6 mounted on the cage 5 from the set of rollers 8 carried on the trolley 7.
  • the said translatory movement of the trolley 7 thus makes possible a selective variation of the length of the individual branches of the web festoon formed between the rollers 6 and 8 and therefore also the overall length of web material accumulated in the storage unit defined by the rollers 6 and 8.
  • the driving means 9 - and therefore also the appropriate control commands - are configured in such a way as to make it possible for the rollers 8 to descend below the level of the rollers 6. Placing the trolley in this position at the moment when the device 1 is initially prepared for operation, the web W can be made to pass horizontally between the rollers 6 and the rollers 8, which in that position will be situated, respectively, just above and just below the web. When the driving means 9 subsequently determine an upward movement of the rollers 8 to rise, this will automatically cause the web to become disposed in the manner of a festoon.
  • the web material W enters the device 1 by passing over a series of rollers that are here jointly indicated by the reference number 13.
  • the said series of rollers 13 comprises at least one motor-operated roller 14 over which the web W has to pass before it arrives, passing over one or more deflection rollers (such as the one here indicated by reference number 15), at the intake side of the previously described storage unit.
  • the roller 14 is operated, once again preferably via an appropriate reduction gear 16, by other driving means 17 substantially similar to the previously described driving means 9 and likewise slave to the control unit 10.
  • the web W passes over one or more deflection rollers 18, which must comprise at least one roller 19 performing the function of a so-called "floating" or “jockey” roller.
  • the roller 19 in question is mounted on a lever arm 20 capable of oscillating around a horizontal hinge pin 21 projecting from the supporting panel 4.
  • the oscillating lever arm 20 should preferably be subject to the balancing action of a counterweight or some similar return device here indicated by the reference number 22.
  • the latter should preferably act in the sense of inducing the lever arm 20 to swing in the direction that will cause a slackening of the loop of web material W that passes round the roller 19.
  • the reference number 23 indicates a position sensor (of a known type, which could be - for example - a linear potentiometer or some similar device) capable of providing the control unit 10 with a finely sensitive feedback signal that will enable the said control unit to detect with considerable accuracy any difference between the speed with which the web material W is fed into the intake side 3 of the device 1 and the speed with which the said web is paid out after leaving the storage unit defined by the rollers 6, 8.
  • a position sensor of a known type, which could be - for example - a linear potentiometer or some similar device
  • the speed v 1 shown in Figure 3 corresponds to the speed at which the web material W passes over the set of rollers 13 at the intake side 2 of the device 1 and, more particularly, the motor-driven roller 14. In practical terms, this speed is determined by the speed of rotation that the control unit 10 imposes on the driving means 17.
  • the diagramme reproduced as Figure 4 identifies the operating speed that the said control unit 10 imposes on the driving means 9, i.e. the driving means that move the trolley 7 up and down. More precisely, the speed v 2 shown in Figure 4 represents the speed with which, following operation of the driving means 9, the web W is effectively paid out at the output side 3 of the device when the intake speed v 1 is reduced to zero.
  • the trolley 7 is to be found in a position at some distance from the cage 5 (to be quite clear: in the position indicated schematically by means of broken lines in Figure 1).
  • the driving means 9 are necessarily at a standstill and its speed of rotation is zero (always refer to the part of Figure 4 immediately preceding the time t 1 ).
  • the driving means 9 are not running and the speed v L , at which the web issues from the output side of the device 1 depends solely on the driving means 17.
  • the feedback signal provided by the sensor 23 and generated by the so-called "jockey” roller 19 will make it possible to absorb any instantaneous speed fluctuations, since these will become translated into a momentary variation of the position and orientation of the lever arm 20.
  • the described feedback mechanism aims at compensating accidental differences between the input speed and the output speed, this in the sense of seeking to keep the lever arm 20 always pointing in the same direction.
  • the control unit 10 In order to avoid this slowdown of the feed rate having repercussions on the payout to the downstream station, the control unit 10 immediately activates the driving means 9 and thus causes the trolley 7 to move downwards and come closer to the cage 5. The result of this movement is a gradual reduction of the length of web contained in the storage device. This becomes necessarily translated into the stored web being paid out to the output side 3 at a speed v 2 , which can be selectively controlled (in a known manner, via the geometry of the storage unit 6, 8) by the control unit 10 and in accordance with a ramp pattern that is the exact counterpart (complement) of the ramp pattern in accordance with which the feed rate on the intake side is being reduced.
  • This operating mode is continued for the entire period of time in which the feed of web material to the intake side of the device has to be minimized or completely suspended (for example, to permit the two lengths of web material to be spliced in standstill or substantial standstill conditions), that is to say, until the instant of time indicated by t 3 .
  • the control unit 10 will act on the two driving means 9 and 17 in accordance with the complementary modalities described hereinabove and schematically illustrated in Figures 3 and 4 for the time intervals between t 3 and t 4 .
  • the speed v 1 at which web material is fed to the device (driving means 17) will thus be gradually increased, so that it will be gradually brought up to its normal operating value (which de facto corresponds to v L ), while the speed at which the trolley 7 is lowered will be gradually and complementarily reduced until the trolley 7 (at the time t 4 ) is brought to a complete standstill in its lowermost position, at which point the driving means 9 are also brought to a halt.
  • control unit 10 again acts on the driving means 9, causing them to rotate (but now in the direction opposite to the one in which it rotated during the phase in which the stored length of web material was paid out to the output side of the device), so that the trolley 7 will now be gradually raised to its uppermost position, shown by the dotted line in Figure 1, which has the effect of creating a new reserve of web material within the storage device.
  • This operation of reconstituting the reserve can generally be carried out by operating in a gradual manner and therefore at a slow speed, always preserving (just as in all the other operating conditions of the storage device) the possibility of exercising fine control over the web supply rate assured by the supply speed sensor, which (in the embodiment here illustrated) is represented by the so-called "jockey" roller 19 mounted on the lever arm 20 and the various organs associated therewith.
  • the supply speed sensor which (in the embodiment here illustrated) is represented by the so-called "jockey" roller 19 mounted on the lever arm 20 and the various organs associated therewith.
  • the device 1 in accordance with the invention is a completely self-contained piece of equipment and can therefore perform its function no matter what type of web handling and/or processing stations may be situated upstream and downstream of it.
  • the device in accordance with the invention can be combined with any type of unwinding station and any type of splicer, quite irrespective of whether the latter operates at zero speed or at full speed.
  • the device in accordance with the invention can be used both with tape splicing systems and with splicing systems of the hot wire type.
  • the device in accordance with the invention not only completely avoids tensile forces acting on the web W, but also drastically reduces the accelerations to which the various mechanical components of the system are subjected, including the set of parts (rollers 6 and 8 and the elements associated with them) that form the web reserve festoon.
  • the device in accordance with the invention can be used to dilate the braking and acceleration times of the web rolls as compared with the corresponding times of the line they serve, and this quite independently of the switchover phase. This may become necessary with unstable rolls of raw material (for example, rolls having a very high ratio between diameter and web width) or rolls having an extremely high moment of inertia.
  • the device in accordance with the invention makes it possible to modulate the deceleration, switchover and acceleration "ramps" to take due account of the various parameters in play.
  • the straight-line pattern of the acceleration and deceleration ramps shown in Figures 3 and 4 are to be considered as purely exemplifying and can therefore be replaced by any other pattern capable of being used for that purpose (for example, acceleration and deceleration ramps of what is currently known as the "cos 2 " type).
  • the time of the deceleration ramp used to slow down a dispensing roll about to become exhausted can be cut down, subsequently extending the time of the acceleration ramp of the ready roll inserted to serve as the new source of web material, so that the motors to be installed can be of more limited power and reducing the probability of such harmful phenomena as roll decoring.
  • the device in accordance with the invention is particularly and almost ideally suitable for retrofitting operations on existing installations, i.e. when it is desired to improve the performance of an existing plant without extensive reconfiguration interventions.
  • roller 19 (hereinabove referred to as "jockey” roller), together with the other elements associated with it, could also be situated upstream of the storage unit constituted by the rollers 6 and 8 and, more precisely, in a position between the roller set 13 inclusive of the motor-driven roller 14 and the said storage unit. This would still preserve the advantage deriving from the fact that the action of detecting the web speed is based on the slackening or the shortening of a loop formed by the web itself in substantial absence of tensile stresses applied to the web material W.

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  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
EP98830783A 1998-12-24 1998-12-24 Dispositif d'alimentation d'une bande Withdrawn EP1013585A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP98830783A EP1013585A1 (fr) 1998-12-24 1998-12-24 Dispositif d'alimentation d'une bande

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP98830783A EP1013585A1 (fr) 1998-12-24 1998-12-24 Dispositif d'alimentation d'une bande

Publications (1)

Publication Number Publication Date
EP1013585A1 true EP1013585A1 (fr) 2000-06-28

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EP98830783A Withdrawn EP1013585A1 (fr) 1998-12-24 1998-12-24 Dispositif d'alimentation d'une bande

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002057168A1 (fr) * 2001-01-18 2002-07-25 Gevas Verpackungsmaschinen Gmbh Procede et dispositif pour fournir un materiau en bande
US6811637B2 (en) 2001-07-20 2004-11-02 Fameccanica.Data S.P.A. Process and device for picking up materials
WO2011114254A1 (fr) 2010-03-18 2011-09-22 Fameccanica.Data S.P.A. Procédé pour l'épissage des parties d'un matériau d'âme et dispositif correspondant
CN104386520A (zh) * 2014-09-28 2015-03-04 昆山一鼎电镀设备有限公司 一种双面异形料带产品缓冲机
EP2886089A1 (fr) 2013-12-17 2015-06-24 Fameccanica. Data S.p.A. Procédé et appareil pour le soudage transversal des structures élastiques superposées
EP3095589A1 (fr) 2015-05-15 2016-11-23 Fameccanica.Data S.p.A. Dispositif et procédé de formation de soudures par ultrasons sur des matériaux en bande en mouvement continu
EP3578344A1 (fr) 2017-06-20 2019-12-11 Fameccanica.Data S.p.A. Procédé de chargement automatique de bobines dans un ensemble de déroulement

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB616271A (en) * 1945-06-22 1949-01-19 Carnegie Illinois Steel Corp Improvements in a looper for control of travelling elongated material
DE2227995A1 (de) * 1972-06-08 1974-01-03 Giesenhagen Kg Durchlaufspeicher fuer bandfoermiges material
US3995791A (en) * 1975-07-09 1976-12-07 Package Machinery Company Continuous web supply system
JPS59118645A (ja) * 1982-12-23 1984-07-09 Fuji Tekkosho:Kk シ−ト状物速度差整合装置
EP0169476A2 (fr) * 1984-07-21 1986-01-29 Graphischer Maschinenbau Gmbh Dispositif pour effectuer un changement de bobine
EP0521159A1 (fr) * 1990-04-13 1993-01-07 Sk Engineering Ltd Systeme automatique de jonction de bandes

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB616271A (en) * 1945-06-22 1949-01-19 Carnegie Illinois Steel Corp Improvements in a looper for control of travelling elongated material
DE2227995A1 (de) * 1972-06-08 1974-01-03 Giesenhagen Kg Durchlaufspeicher fuer bandfoermiges material
US3995791A (en) * 1975-07-09 1976-12-07 Package Machinery Company Continuous web supply system
JPS59118645A (ja) * 1982-12-23 1984-07-09 Fuji Tekkosho:Kk シ−ト状物速度差整合装置
EP0169476A2 (fr) * 1984-07-21 1986-01-29 Graphischer Maschinenbau Gmbh Dispositif pour effectuer un changement de bobine
EP0521159A1 (fr) * 1990-04-13 1993-01-07 Sk Engineering Ltd Systeme automatique de jonction de bandes

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 008, no. 240 (M - 336) 6 November 1984 (1984-11-06) *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002057168A1 (fr) * 2001-01-18 2002-07-25 Gevas Verpackungsmaschinen Gmbh Procede et dispositif pour fournir un materiau en bande
US6811637B2 (en) 2001-07-20 2004-11-02 Fameccanica.Data S.P.A. Process and device for picking up materials
WO2011114254A1 (fr) 2010-03-18 2011-09-22 Fameccanica.Data S.P.A. Procédé pour l'épissage des parties d'un matériau d'âme et dispositif correspondant
EP2886089A1 (fr) 2013-12-17 2015-06-24 Fameccanica. Data S.p.A. Procédé et appareil pour le soudage transversal des structures élastiques superposées
EP3583929A1 (fr) 2013-12-17 2019-12-25 Fameccanica.Data S.p.A. Procédé et appareil de soudage transversal de structures élastiques à chevauchement
CN104386520A (zh) * 2014-09-28 2015-03-04 昆山一鼎电镀设备有限公司 一种双面异形料带产品缓冲机
CN104386520B (zh) * 2014-09-28 2016-08-17 昆山一鼎工业科技有限公司 一种双面异形料带产品缓冲机
EP3095589A1 (fr) 2015-05-15 2016-11-23 Fameccanica.Data S.p.A. Dispositif et procédé de formation de soudures par ultrasons sur des matériaux en bande en mouvement continu
US10377085B2 (en) 2015-05-15 2019-08-13 Fameccanica.Data S.P.A Device and method for forming ultrasonic welds on web materials in continuous movement
EP3578344A1 (fr) 2017-06-20 2019-12-11 Fameccanica.Data S.p.A. Procédé de chargement automatique de bobines dans un ensemble de déroulement

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