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
  • B65H20/02—Advancing webs by friction roller
  • B65H20/04—Advancing webs by friction roller to effect step-by-step advancement of web
• • 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
  • B65H23/18—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web
  • B65H23/188—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web in connection with running-web
  • B65H23/1888—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web in connection with running-web and controlling web tension
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
  • B31B50/005—Making rigid or semi-rigid containers, e.g. boxes or cartons involving a particular layout of the machinery or relative arrangement of its subunits
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
  • B31B50/02—Feeding or positioning sheets, blanks or webs
  • B31B50/10—Feeding or positioning webs
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
  • B31B50/74—Auxiliary operations
  • B31B50/81—Forming or attaching accessories, e.g. opening devices, closures or tear strings
  • B31B50/84—Forming or attaching means for filling or dispensing contents, e.g. valves or spouts

Definitions

• the present invention relates to a multi-stage unit for processing a web of packaging material, comprising a first and a second processing station.
• packaging containers are sometimes produced in that a web of packaging material is reformed into a tube in a forming unit in a filling machine where the one longitudinal edge of the material web is joined together in overlap with the second longitudinal edge, whereafter the tube is filled with the intended contents and sealed along transverse sealing zones disposed in spaced apart relationship to one another.
• the sealed portions of the tube thus containing contents are thereafter separated from the tube by means of cuts in the sealing zones and are formed, where applicable, by folding to a desired geometric configuration depending upon how the two seals disposed transversely of the longitudinal direction of the tube are oriented.
• the material web may be fed through a multi-stage unit for processing in several sequential operations.
• opening devices for example screw caps, foldable tops or pull tabs
• these operations can comprise punching so as to create holes at desired positions along the web, and mounting of the opening device over these holes.
• the opening devices may be mounted in position in that they are injection moulded direct on the holes, for example in accordance with the description in WO 98/18609.
• US 6,386,851 discloses a multi-stage unit comprising a processing station in which holes are punched in the packaging material web, and a processing station in which opening devices are injection moulded in the holes. Both of the stations each include a number of processing tools positioned with a certain mutual spacing along the path of the material web. With this design, simultaneous processing is permitted of a distance of the packaging material web corresponding to a number of future packages. With, for example, a punching station comprising three punching tools, three holes may be punched simultaneously, one in each web portion to be formed into a package, i.e. in each of three future packages.
• the mutual spacing between the processing tools thus depends upon the relevant packaging volume, i.e. the size of the package being produced, so that each respective hole is punched at a given place on each future package.
• the mutual spacing between the processing tools also depends upon how the web is indexed and, in a number of cases, the processing tools are thereby positioned at a distance corresponding to one packaging web portion from one another, in other cases at a distance corresponding to two or more packaging web portions.
• the multi-stage unit must thus, in many cases, be replaced or rebuilt, which, in certain cases, may take up considerable time.
• the multi-stage unit comprises, for processing a web of packaging material, a first processing station where a first processing step is carried out on the material web, a second processing station where a second processing step is carried out on the material web, the first processing station comprising a first processing tool and at least one second processing tool placed downstream of the first, the second processing station comprising a first processing tool, and the multi-stage unit also comprising a web tensioning device for the material web which is placed between the first and the second processing stations.
• both of the first processing tools in the first and second processing station can process the same package which, in the event of production stoppage, facilitates the check that no package departs from the multi-stage unit unprocessed or semi-processed and which also increases the precision between punching and injection moulding.
• the present invention also encompasses a multi-stage unit for processing a web of packaging material, comprising a first processing station where a first processing step is carried out on the material web, a second processing station where a second processing step is carried out on the material web, the first processing station comprising a first and at least one second processing tool placed downstream of the first, the second processing station comprising a first processing tool, and the multi-stage unit also comprises a web-tensioning device for the material web which is placed between the first and the second processing stations.
• the multi-stage unit makes it possible to design the multi-stage unit so that it will be adjustable as described above even if the entire unit as such is limited to a certain height or length so as to fit in the filling machine.
• the processing tools and/or the web- tensioning device may be positioned offset, i.e. may be displaced from the centre of linkage intersections in a linkage arrangement which entails that the unit will be adjustable.
• the web-tensioning device is a tensioning device for the material web comprising a tensioning roller which cooperates with the packaging material and resilient support members for this tensioning roller.
• the first processing station is a punching station where holes are made in the material web.
• the second processing station is an injection moulding station for injection moulding of opening devices on said holes.
• Fig. 1 schematically shows a side elevation of a multi-stage unit comprising a first processing station and a second processing station
• Fig. 2 schematically shows two views, one in side elevation and one in perspective, of a linkage arrangement which interconnects the respective processing tools in the first station and the web-tensioning device
• Fig. 1 schematically shows a side elevation of a multi-stage unit comprising a first processing station and a second processing station
• Fig. 2 schematically shows two views, one in side elevation and one in perspective, of a linkage arrangement which interconnects the respective processing tools in the first station and the web-tensioning device
• Fig. 1 schematically shows a side elevation of a multi-stage unit comprising a first processing station and a second processing station
• Fig. 2 schematically shows two views, one in side elevation and one in perspective, of a linkage arrangement which interconnects the respective processing tools in the first station and the web-tensioning device
• Fig. 1 schematically shows a side elevation of a multi-stage
• FIG. 3 schematically shows two views, where the left-hand view shows where a tensioning roller with radius r s is to be placed in relation to a linkage intersection in order that the theoretical model be attained, and the right-hand view shows how a bending roller with radius fy affects the system;
• Fig. 4 schematically illustrates the factor f, i.e. the relationship between the positioning of the web-tensioning device and the processing tools;
• Fig. 5 schematically illustrates the factor f, and
• Fig. 6 schematically illustrates the factor f.
• the multi-stage unit is employed for processing a web 2 of packaging material and is included in a filling machine (not shown) for producing packages, in particular food packages.
• the web 2 is fed through the multistage unit 1 along a path P.
• the advancement takes place by 3:3 indexing of the web, i.e. three web portions are advanced in each processing cycle.
• the term web portion is taken to signify that length of the packaging material which is consumed to form one package.
• the multi-stage unit 1 includes a first processing station 3 where a first processing step is carried out on the material web 2.
• the first processing station 3 is placed along a first vertical section P-i of the path P of the material web.
• said first processing station is a punching station 3 in which openings or holes 4 are punched in the packaging material 2.
• the openings or holes 4 which, for example, are circular in configuration, are punched with uniform distribution along the web 2.
• the distance between the openings or holes is normally called the distribution length and is normally defined as the distance between one point on the web, for example a point where an opening is to be punched, to the next such point, i.e. where the next opening or hole is to be made.
• the distribution length is as long as a web portion, whereby an opening or hole 4 is being punched in each future package.
• the openings or holes 4 are made substantially centrally on the web portion, and thus the distribution lengths begin and end in a point centrally on the web portion. Hence, it should be perceived that one distribution length and one web portion need not begin at the same point on the web.
• the first processing station 3 includes a first processing tool 3a and at least one second processing tool 3b placed downstream of the first.
• the station 3 also includes a third processing tool 3c placed downstream of the second.
• the number of processing tools corresponds to the number of web portions indexed in each cycle.
• the processing tools work "in parallel", i.e.
• the unit 1 further includes a second processing station 5 where a second processing step is carried out on the material web. Said second station is placed downstream of the first station along a horizontal section P 2 of the path P of the material web.
• the second station is an injection moulding station 5 where opening devices 6 of thermoplastic material are injection moulded on the material web 2 at its opening 4.
• the second processing station 5 includes a first processing tool 5a.
• the station 5 also includes a second and a third processing tool 5b and 5c, i.e. the number of processing tools in the second station 5 is preferably equal to the number of processing tools in the first station 3.
• Reference numeral 7 relates generically to a system for the stepped advancement of the web 2 through the multi-stage unit 1.
• This advancement system 7 includes a pair of infeed rollers 8, 9 which act one on each side of the material web 2.
• the roller 8 is driven by a first servomotor 10 by the intermediary of a first synchronous transmission 11 , for example a gear belt transmission.
• the roller 9 is preferably idle and only journalled.
• the infeed rollers 8 and 9 lie upstream of the first processing station 3 along the path P of the material web.
• the servomotor 10 is controlled so that the web 2 is advanced stepwise by a control unit 14 which receives a first input signal Si from an optical indicator 15 which is located in the proximity of the first processing tool 3a.
• the signal Si may, for example, be generated by a bar code or the like on the material web.
• the advancement system 7 also displays a pair of discharge rollers 16, 17 which lie downstream of the first processing station 3 along the path P. These discharge rollers 16 and 17 act one on each side of the material web 2.
• a servomotor 18 drives the roller 16 by the intermediary of a second synchronous transmission 19, for example a gear belt transmission.
• the roller 17 is preferably idle and merely journalled.
• the servomotor 18 is controlled by the control unit 14 which receives a second input signal S 2 from an optical indicator 20 which is positioned in the proximity of the second processing station 5, for example directly upstream of the first injection moulding tool 5a.
• the indicator 20 can thereby read-off, for example, the position of those holes 4 which are made by the punching tools 3a-c and cause the control unit 14 to stop the servomotor 18 on the basis of the signals from the indicator 20 so that the holes 4 are positioned within a permitted tolerance inside each respective injection moulding cavity in the injection moulding tools 5.
• the multi-stage unit 1 further includes a web-tensioning device 21 for the material web 2.
• the web-tensioning device 21 is placed along the path P between the first and the second processing stations 3, 5. Those differences which the web-tensioning device 21 normally need to take up are slight and are to be found within a given narrow interval.
• the web-tensioning device 21 is a tensioning device for the material web 2 comprising a tensioning roller 23, with a radius r s , which cooperates with the packaging material 2 and resilient support members (not shown) for this tensioning roller 23.
• the tensioning device also includes a support frame 22.
• the material web 2 abuts with a circumferential angle of substantially 180° around the tensioning roller 23 so that the direction of the web is changed and the web 2 is guided up to a bending roller 24 with a radius /&.
• the section P 2 of the path P begins.
• the material web 2 abuts with a circumferential angle of substantially 90° around the bending roller 24.
• the tensioning roller 23 may rotate about an axis A which, in the examples, is at right angles to both of the web sections Pi and P 2 , see Fig. 2.
• the axis of rotation A lies in a shaft (not shown) which, in both ends, is connected to arms 28 which are journalled about an axis B in the support frame 22.
• Each arm 28 is pre-tensioned by one of the resilient support members, this resilient support member being disposed between the journal points of the arm 28 in the support frame 22 and the anchorage of the tensioning roller 22 in the arm 28.
• This arrangement imparts to the material web 2 a pre-set, substantially constant tension. Differences in the web advancement at the infeed rollers 8, 9 and the discharge rollers 16, 17, respectively, as a result of the fact that they do not advance the web 2 completely synchronously are taken up by the "floating" movement of the tensioning roller 23 in the web-tensioning device 21. In order for it to be possible to take up differences in the advancement, there is a material web loop, a slack, between the first and second processing stations 3, 5.
• the length of the material web loop corresponds in the example to the length of one indexing, i.e. corresponding to three web portions, so that an opening or hole 4 which is punched in the first processing tool 3a will subsequently be injection moulded in the first processing tool 5a in the second processing station 5.
• the same result may also be achieved in those cases where the length of the material web loop is a whole number multiple of the number of web portions which are located in the first processing station 3, as will be described in greater detail below.
• Each respective processing tool 3a-c in the first processing station 3 and the web-tensioning device 21 are interconnected by a linkage arrangement 25 of conventional gantry type as shown in Fig. 2 and as will be described in greater detail below.
• a linkage arrangement 25 of this type will be protractable and retractable, respectively, with a uniform spacing between the inner and outer linkage intersections 26, 27, respectively.
• the distance between a first inner linkage intersection 26a and a second inner linkage intersection 26b is designated l_ ⁇ .
• the distance between the second inner linkage intersection 26b and a third linkage intersection 26c is designated L 2 .
• the processing tools 3a-c are placed on these linkage intersections.
• the web-tensioning device is also secured to a linkage intersection and the distance between the third linkage intersection 26c and that linkage intersection to which the web-tensioning device 21 is secured is designated L ⁇ .
• the radius r s of the tensioning roller and the radius ti > of the bending roller are both very small, i.e. substantially zero.
• the processing tools 3a-c and the web-tensioning device 21 are placed on the linkage intersections so that the punching elements and that point which constitutes the "tensioning roller" (r s close to or equal to zero) are located at the same height, i.e. in line with a respective linkage intersection.
• the tensioning roller 23 normally displays a considerable radius r s and arch length B s .
• ⁇ B b 2- ⁇
• the centre of the punching element in the first processing tool 3a is placed at the same height as, i.e. lies flush with, the first inner linkage intersection 26a.
• the centre of the punching element in the second processing tool 3b is placed at the same height as , i.e. lies flush with, the second inner linkage intersection 26b.
• the centre of the third punching element is placed at the same height as the third inner linkage intersection 26c.
• the web-tensioning device 21 is, in the example, placed on a fourth linkage intersection 26d, as will be described in greater detail below, and that point which constitutes the "tensioning roller" is located on the same height, i.e. flush with this fourth linkage intersection 26d.
• the mutual spacing between the processing tools 5a-c i.e. the distribution length
• the mutual spacing between the processing tools 5a-c is preferably substantially the same as in the first processing station, i.e. the spacing corresponds to the distance L-i.
• 3:3 indexing three mutually subsequent punched openings or holes 4 may be processed.
• the multi-stage unit 1 according to the present invention is flexible and can be adjusted for the production of different packaging sizes. This implies 5 that the mutual distance L
• the smallest packaging size that can be produced is limited by the extent of each respective tool along the path of the web, i.e. the smallest distribution length is obtained in the position where the processing tools have been moved as close to one another as possible and, as a result, their housings abut.
• first processing tools 3a, 5a are fixedly disposed in their respective processing stations 3, 5. This implies that the housing in the first punching tool 3a is fixedly anchored in the frame of the filling machine, like the housing for the first injection moulding tool 5a. Further, the second processing tool 3b in the first processing station 3 is
• the web-tensioning device 21 is moveable in relation to the third processing tool 3c.
• the web-tensioning device 21 is secured in a linkage intersection at a distance l_ ⁇ from that linkage intersection 26c to which the third processing tool 3c is secured.
• Which linkage intersection is relevant depends upon a number of factors.
• the distance L ⁇ is the distance Li multiplied by the factor f, where where m is a whole number multiple of the number of web portions located in the first processing station 3, and where n is the number of processing tools in the first processing station 3.
• the variable m relates to the length of the material loop, how many times it is longer in relation to the length of the 35 relevant number of web portions in the first station 3, and in the described example, the number of web portions in the first processing station is equal to the number of web portions in the material loop, in which event m is equal to 1. Further, there are three processing tools in the first processing station 3 and n will therefore be 3. Thus, the factor f by which the distance l_ ⁇ is to be multiplied will thus be 1. Consequently, the distance L ⁇ in this case will be equal to the distance L
• the linkage arrangement is designed in such a manner that, on a change of the distance l_ ⁇ between the first processing tool 3a and the second processing tool 3b, there will be obtained a corresponding change of the distance L 2 between the second processing tool 3b and the third tool 3c. Similarly, there will be obtained a change of the distance L ⁇ between the web-tensioning device 21 and the third processing tool 3c.
• f will, like before, be 1 in which event the changes are of equal size.
• the geometry entails that the total change of the distance from the first processing tool 3a to the web-tensioning device 21 is as large as the total change of the material web distance between the web-tensioning device and the first tool 5a in the second processing station 5.
• FIG. 1 shows a position where the processing tools 3a-c in the first processing station 3 are positioned in spaced apart relationship from one another.
• the second and third processing tools 3b, 3c have therefore been displaced away from the first, fixedly disposed processing tool 3a in a direction along the material web 2, and the web-tensioning device 21 has been placed a distance from the third processing tool 3c.
• the circle markings in the figure relate to punched openings 4, i.e. the beginning and end of each respective distribution length.
• the dashes at right angles to the material web 2 relate to the beginning and end of each respective web portion. It may be seen that the first web portion begins immediately ahead of the first processing tool 3a in the first station 3 and the third ends immediately after the third processing tool 3c.
• the first distribution length begins in on half of the first web portion.
• the fourth web portion is folded over a point which relates to "tensioning roller 23" (which, in the theoretical model, has the radius r s close to or equal to zero) so that an opening or hole 4 arrives substantially in said point, i.e. the third distribution length ends substantially centrally on the web-tensioning device 21.
• the seventh web portion begins immediately ahead of the first processing tool 5a in the second processing station 5 and the sixth distribution length begins centrally thereof, i.e. the opening or hole 4 is located centred under the first injection moulding tool 5a. There will thus be located as many punched openings or holes 4 in the material loop as in the first and second processing stations 3, 5, respectively.
• the linkage arrangement will be described in the following disclosure and with reference to Fig. 2. It should however be observed that the linkage arrangement which is shown in the figure does not fully correspond to the theoretical model, since it can be seen that neither the punching elements nor the web-tensioning device are correctly positioned in relation to the centre of the linkage intersections.
• the second and third tools 3b, 3c, as well as the web-tensioning device 21 are moveable along guides 29 and the displacement proper is realised with the aid of ball screws 30 secured in the housing of the third tool.
• the ball screws 30 are driven by a servomotor (not shown). In order that no force is applied on the linkage system during operation of the multi-stage unit, i.e.
• two locking devices 31 are disposed between the third tool 3c and the web-tensioning device 21.
• These locking devices 31 each include a compressed air cylinder 32 which each surround a shaft 33. No further locking between the first and second tools 3a, 3b and between the second and third tools 3b, 3c, respectively is needed, since the geometry of the linkage system automatically provides locking of all linkages through the locking devices 31.
• the positioning of the web-tensioning device 21 in relation to the third processing tool 3c in the first processing station 3 is calculated using the factor f.
• the factor depends upon n and m, i.e. if the number of processing tools in the first processing station is changed and/or the number of web portions in the material loop is changed, the factor is correspondingly changed. In table 1 can be seen different values of the factor /for different m and n.
• the number of web portions in the material loop is equal to the number of web portions in the first station.
• the length of the material loop can be a multiple m of the number of web portions in the first station, i.e. the number of web portions can be multiplied by a whole number m.
• L ⁇ would thereby be Li multiplied by 2.5.
• the linkage system would then need to be extended so that the web-tensioning device 21 could be interconnected to a linkage intersection which is located 2.5 steps upwards, i.e.
• the web-tensioning device is moved from the fourth inner intersection 26d to a fifth outer intersection 27e, see Fig. 5.
• the processing tools 5a-5c in the second station 5 are preferably correspondingly moveable, i.e. the second processing too! 5b in the second processing station 5 is moveable in relation to the first processing tool 5a in a direction along the material web 2.
• the third processing tool 5c is moveable in relation to the second processing tool 5b in a direction along the material web 2.
• the interconnection between the tools 5a-c can be into effect employing a linkage system in accordance with the foregoing or, for example, using a ball screw system where the motor is positioned on the second processing tool 5b.
• the theoretical model has been described with reference int. al. to Fig. 1 which actually shows the multi-stage unit when the tensioning roller 23 in the web-tensioning device 21 has a radius r s and a brief description now follows: In order to compensate for the radius so that the multi-stage unit behaves as in the theoretical model, the web-tensioning device 21 has been moved so that its uppermost point, i.e.
• the tangent to the uppermost point in the circumferential surface of the tensioning roller 23 is located the distance k below the fourth linkage intersection 26d.
• an opening or hole 4 will thereby be located on the uppermost point.
• the second station 5 has been moved a horizontal distance 2r s to the right in the figure, i.e. in a direction away from the web-tensioning device 21. If a new radius were to be selected, a new compensation must be made, i.e. a new distance k must be calculated and the second station must be moved a distance 2Ar s , i.e. the difference between the new and the old radius multiplied by 2.
• the multi-stage unit 1 When this has been done and the parts have been locked in the multi-stage unit 1 , it functions as the theoretical model, i.e. the multi-stage unit 1 can be adapted by means of the linkage system 25 for processing another length of web portions.
• the linkage system 25 There are often limitations to the space in the filling machine where the multi-stage unit 1 is to be positioned and, in certain cases, it may be necessary to depart from the ideal model because the multi-stage unit 1 is, for example, limited to a given height or length.
• the theoretical model must then be modified and, in the following disclosure, a second, more practical embodiment will be described with reference to Fig. 2.
• the punching elements are positioned offset, i.e.
• the multi-stage unit 1 Only when this has been set in relation to those constants which are relevant in the system can the distances between the first tool 3a, 5a in each respective station 3, 5 be established and locked to the filling machine, i.e. the multi-stage unit 1 must be constructed in response to certain given preconditions.
• a multi-stage unit 1 which has been constructed in this manner will then be adjustable in the same way as the theoretical mode, i.e. k1-k4 remain constant while L
• the system must be reconstructed and each respective first processing tool 3a, 5a must probably need to be moved in relation to one another.
• the position of the first and second stations 3, 5 may naturally be given from the start and then it is the constants k 1-k4 which must be adjusted so that the correct relationships are attained between the parts in the multi-stage unit 1.
• the present invention has only been described with respect to one currently preferred embodiment, it should be clear to a person skilled in the art that the present invention is not restricted thereto, but that a plurality of variations and modifications are conceivable without departing from the scope of the appended Claims.
• a multi-stage unit 1 has been described as comprising two stations 3, 5.
• the number of stations may be increased.
• the number of processing tools in each station 3, 5 need not be three as in the described example, but could be a different number.
• another indexing is also selected corresponding to the number of tools, for example 4:4 indexing if the number of tools n is increased to four.
• 3:3 indexing has been described.
• the present invention also functions in other types of indexing.
• the indexing 1 :5 may, for example, be put into effect. This type of indexing has been described in publication EP 1 249 399 and the indexing proper will not be described in greater detail.
• the multi-stage unit has been described as comprising a punching station and an injection moulding station, but it should, however, be understood that it can be employed in different types of practical applications and thereby contain other stations.
• the second processing station may comprise applicators for pull tabs which are to be sealed over each respective punched hole.
• Another alternative for the second station may comprise applicators for opening devices of the type consisting of screw caps etc. It should further be understood that the construction of the advancement system as described may be modified without departing from the scope of the invention. Similarly, both stations of the multi-stage unit can alternatively be placed along one and the same vertical line P-i, or along one and the same horizontal line P 2 .
• the processing tools 3a-c in the first station and the web-tensioning device 21 are interconnected to each other by means of the above described linkage system 25. Alternative apparatuses and systems for interconnection may however be employed, for example ball screws may be used. Another alternative is to connect in a servomotor to each tool as well as one to the web-tensioning device.
• one type of web-tensioning device 21 has been described. It should, however, be understood that its construction may be of a different type, for example an air cylinder may be employed. Alternatively, a web- tensioning device of the type described in US 6,386,851 may be employed.

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• 2004
  • 2004-01-13 SE SE0400042A patent/SE526408C2/sv not_active IP Right Cessation
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  • 2004-11-24 WO PCT/SE2004/001721 patent/WO2005068298A1/en not_active Ceased
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