US3727814A - Tear-off apparatus for successively tearing off a length from the leading end of a moving flattened tubular web of material - Google Patents

Tear-off apparatus for successively tearing off a length from the leading end of a moving flattened tubular web of material Download PDF

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Publication number
US3727814A
US3727814A US00120916A US3727814DA US3727814A US 3727814 A US3727814 A US 3727814A US 00120916 A US00120916 A US 00120916A US 3727814D A US3727814D A US 3727814DA US 3727814 A US3727814 A US 3727814A
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US
United States
Prior art keywords
web
rolls
tear
rollers
rows
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.)
Expired - Lifetime
Application number
US00120916A
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English (en)
Inventor
G Kuckhermann
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.)
Windmoeller and Hoelscher KG
Original Assignee
Windmoeller and Hoelscher KG
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
Priority claimed from DE19702011101 external-priority patent/DE2011101C/de
Application filed by Windmoeller and Hoelscher KG filed Critical Windmoeller and Hoelscher KG
Application granted granted Critical
Publication of US3727814A publication Critical patent/US3727814A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B65H35/00—Delivering articles from cutting or line-perforating machines; Article or web delivery apparatus incorporating cutting or line-perforating devices, e.g. adhesive tape dispensers
    • B65H35/10—Delivering articles from cutting or line-perforating machines; Article or web delivery apparatus incorporating cutting or line-perforating devices, e.g. adhesive tape dispensers from or with devices for breaking partially-cut or perforated webs, e.g. bursters
    • 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
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/14—Cutting, e.g. perforating, punching, slitting or trimming
    • B31B70/16—Cutting webs
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T225/00—Severing by tearing or breaking
    • Y10T225/10—Methods
    • Y10T225/16—Transversely of continuously fed work
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T225/00—Severing by tearing or breaking
    • Y10T225/30—Breaking or tearing apparatus
    • Y10T225/35—Work-parting pullers [bursters]

Definitions

  • a tear-off apparatus for lengths of flattened tube from a transversely scored or perforated single or multi-ply paper or plastic moving tubular web including a pair of holding rolls adapted to turn at no more than the web feeding speed, a pair of tear-off rolls downstream of the holding rolls and adapted to turn faster than the web feeding speed and at least two rows of deflector rollers for the web extending transversely of the web downstream from the holding rolls and upstream of the tear-off rolls, said rollers being adapted to make substantially point contact with the web.
  • the invention relates to tear-off apparatus for successively tearing off a length from the leading end of a moving flattened tubular web of material.
  • the practice is therefore to provide the material for the individual plies with transverse scorelines or perforations at the required intervals and then to fom them into a tubular web with the scorelines or perforation offset from one another, whereupon the lengths of tube with offset plies are successively torn from the web along the offset scorelines or perforations by means of a tear-off apparatus.
  • Such a tear-off apparatus comprises a pair of holding rolls for the web and a pair of tear-off rolls downstream of the holding rolls as veiwed in the direction of web movement, the web passing between both pairs of rolls.
  • the tear-off rolls turn at a higher peripheral speed than the holding rolls.
  • One of the tear-off rolls can be lifted off the web in sequence withthe operating cycle of the tube-making machine and moved back again so that it is momentarily applied to the web as soon as the offset transverse scorelines 0r perforations are located in a tearoff path which is the distance between the holding rolls and the tear-off rolls.
  • the higher peripheral speed of the tear-off rolls relatively to the holding rolls causes that part of the web located along the tear-off path to be set under a sufficiently high tension to tear the leading length of web that is engaged by the tear-off rolls along the offset transverse scorelines or perforations.
  • the tub on the web during tearing is all the greater if the speed of the web is high and the tensile force that has to be applied increases with an increase in the number of plies of the web and/or increased strength of the web material. It is extremely difficult to ensure that a uniform tensile force will be applied along the scorelines or perforations but on the other hand a uniform tensile force is desirable to facilitate troublefree sudden tearing across the entire width of the web.
  • Tubes which are particularly subjected to this danger are those having offset plies with short preformed longitudinal incisions which are provided to facilitate the formation of corner folds and side folds in the base of the bag to be subsequently made from the severed tube length. These incisions unintentionally increase in length or spread uncontrollably across the web under the tug exerted to the web by the tear-off rolls, the damaged tube lengths being unusable and therefore wasted.
  • the high pressure that needs to be exerted by the tear-off rolls to subject the web to the necessary tension and tear the web along the entire scoreline or perforations may prove disadvantageous.
  • the pressure of the tear-off and holding rolls must of course be very high so that the innermost plies are also engaged and torn apart. Even so, some slipping of the web during tearing is inevitable. If the pressure between the rolls is high then slide marks are formed on the web which not only detract from its appearance but could also influence the strength of the bags to be made from the web.
  • the roll pressure may damage the coating and detrimentally affect the desired sealing effect.
  • stretchable paper the roll pressure may distort the web and make subsequent operations more difficult.
  • paper having a rough surface for example crepe paper, the surface structure is rolled flat wherever the web is engaged by the holding and tear-off rolls and this affects the appearance of the finished bags.
  • Particularly grave difficulties are encountered with multi-ply webs in which one of the outer plies is provided with an internal smooth lining such as of bitumen.
  • the invention aims to provide a tear-off apparatus which will function efficiently on single or multi-ply webs without an undesirably high roll pressure, thereby reducing the power required to drive the rolls and the danger of damage to the web even if the latter is of sensitive materials.
  • a tearoff apparatus for lengths of flattened tube from a transversely scored or perforated single or multi-ply paper or plastics moving tubular web, comprising a pair of holding rolls for the web turning at no more than the web feeding speed, a pair of tear-off rolls downstream of the holding rolls and turning faster than same for momentarily engaging the leading web end between each other, and a plurality of deflectors for the web disposed at a spacing from one another in a row transversely of the web downstream of the holding rolls and upstream of the tear-off rolls, the deflectors projecting through a plane that passes through the nips of the holding and tear-off rolls and being adapted to make substantially point contact with the web.
  • the apparatus of the present invention does not effect tearing in two distinct stages. Instead, the tension applied by the tear-off rolls becomes effective at several points distributed across the width of the web sooner than at other portions of the web. Whilst the web is not engaged by the tear-off rolls, it moves along a deflected path which is predetermined by the deflectors and which differs slightly from the shortest path between the nips of the pairs of rolls. As soon as the tear-off rolls have engaged the leading end of the web and accelerated same, the web is firstly pulled taut at the points where the web is engaged by the deflectors and subjected to the tensile force that is necessary for tearing off the leading end of the web.
  • the deflectors may comprise rollers having a convex periphery so that frictional forces are kept to a minimum or virtually completely avoided if, as is preferred, the deflecting rolls are turned at the same speed as the conveying speed of the web.
  • two or more closely juxtaposed rows of deflectors are provided transversely of the web, the deflectors of one row projecting through the aforesaid plane in a direction opposite to that in which the deflectors of the adjacent row project.
  • the tear-off rolls are in this case set so that for each operating cycle of the machine they engage the web when the transverse scoreline or line of perforations has reached the last row of deflectors.
  • the deflectors may be movable to and from the web in sequence with the operating cycle of the tear-off rolls so that they deflect the web only during the tearing-off operation but remains out of contact with the web at other times.
  • the rollers of each row may be mounted on a common shaft extending across and beyond the entire width of the web and the ends of the shafts of the two rows or every two adjacent rows may be carried by the arms of two-armed pivotable levers disposed adjacent the longitudinal edges of the web, the pivotal axes of the levers lying in the plane of the web and the levers being pivotable to and fro in sequence with the operating cycle of the machine.
  • the spacing of the deflectors of the or each row may be adjustable. This is particularly desirable in cases where the web is preformed with short longitudinal incisions. The deflectors are then set so that they are as far removed as possible from such preformed incisions.
  • FIG. 1 is a diagrammatic side elevation of a tear-off apparatus provided with two rows of deflecting rolls, and
  • FIG. 2 is a diagrammatic plan view of the FIG. 1 apparatus.
  • the illustrated tear-off apparatus comprises a pair of holding rolls 1 and a pair of tear-off rolls 2 downstream of the rolls 1 as viewed in the direction a of movement of a flattened tubular web S.
  • the spacing r between the pairs of rolls constitutes a tear-off path at which leading lengths of the web are successively torn off along preformed transverse perforations P.
  • the spacing r should therefore be less than the intervals, lengthwise of the web S, of the lines of perforations P so that only one line of transverse perforations will be located along the tear-off path at any one time.
  • FIG. 2 of the drawings only a single line of transverse perforations P is shown in FIG. 2 of the drawings. If the web S is made of a plurality of plies which are offset from one another, there would of course be a corresponding number of offset lines of perforations in the vicinity of the single illustrated line.
  • the individual rolls 1 and 2 are alternately pressed against one another and lifted off the web in the sequence of the operating cycle of the tube-making machine or rather of the operating cycle of a perforating apparatus (not shown) for the web.
  • the control mechanism for the individual rolls does not form part of the present invention and the reciprocatability of the rolls is therefore only diagrammatically indicated by the arrows b, b.
  • the peripheral speed of the holding rolls 1 is approximately one-half percent less than the feeding speed imparted to the web S by a pair of feed rolls 3.
  • the peripheral speed of the tear-off rolls 2 is approximately 12 percent higher than the feeding speed of the web.
  • the web S is continuously fed by the rolls 3 whilst the pairs of holding rolls 1 and tear-off rolls 2 are separated.
  • the rolls 1 and 2 are pressed against one another to engage the web and impart thereto the speed at which they are turning. This causes the web to be increasingly tensioned by the more rapidly turning tear-off rolls until the leading end of the web is torn along the perforations, this taking place within a very short time after the upper tear-off roll has been applied to the lower tear-off roll.
  • Downstream of the tearoff rolls the severed length of tube is moved away at an accelerated speed by a conveyor (not shown).
  • each deflector 4 is in the form of a roller which is convexly curved at its periphery and a second row of such roller deflectors is provided as indicated at 4.
  • the rollers 4, 4' are seated on respective shafts 5, 5' and are offset from one another lengthwise of the web S as well as in a vertical direction.
  • the ends of the shafts 5, 5' are mounted in two-armed levers 6, 6' so that the row of rollers 4 projects from above through a plane EE that joins the nips of the pairs of rolls 1, 2 whilst the rollers 4' project through this plane from below.
  • the levers 6, 6' at each side of the web are pivotable about a common axis by means of a rod 7 which can be reciprocated in the direction of the arrows c so that the degree by which the web is deflected out of the plane EE to assume the path F may be adjusted.
  • the deflecting rollers 4, 4 may be moved towards and away from the web in the sequence of the operating cycle of the tear-off rolls 2, in which case the rollers 4, 4' will cause the web to be deflected only whilst the respective rolls 1 and 2 are engaged with the web and they will remain out of contact with the web when only a pair of feed rolls 3 is effective to feed the web.
  • the spacing x of the deflecting rollers along the shafts 5, 5' is adjustable.
  • the convexly curved contour at the periphery ensures that the deflecting rollers will make substantially point contact with the web.
  • the web When the web is tensioned along the path r between the holding rolls 1 and tear-off rolls 2, the web is firstly pressed under the action of this tension with increasing pressure against the deflecting rollers 4, 4 In this way the longitudinal fibres F of the web which pass over the deflecting rollers are tensioned to a greater extent than the fibres located between the adjacent deflecting rollers. As soon as the tension of the fibres F exceeds the tensile strnegth of the perforations P, the latter begin to tear at those places where they lie against the deflecting rollers 4. Since the speed difference between the rolls 1 and 2 is maintained, the initial tears are immediately extended in both directions so that within a fraction of a second the entire web will be torn along the line of perforations P.
  • the deflecting rollers 4 are distributed across the web so that the incisions L pass between two adjacent deflecting rollers where the tensile force on the web becomes effective only after initial tearing-off has commenced. This protects the incisions L from extending uncontrollably.
  • a tear-off apparatus for lengths of flattened tube from a transversely scored or perforated single or multi-ply paper or plastics moving tubular web comprising a pair of holding rolls for the web adapted to turn at no more than the web feeding speed, a pair of tear-off rolls downstream of the holding rolls adapted to turn faster than the web feeding speed for momentarily engaging the leading end of the web between each other, and two rows of deflector rollers for the web, the rows extending transversely of the web downstream from said holding rolls and upstream from said tear-off rolls, said rollers being adapted to make substantially point contact with the web, the rollers of each row being spaced from one another, said two rows being closely juxtaposed, the periphery of the deflector rollers of one of said rows projecting through a plane passing through the nips of said holding and tear-off rolls from one side of said plane and the periphery of the deflector rollers of the other of said rows projecting through said plane from the other side of said plane and in a
  • Apparatus according to claim 1 comprising wherein the rollers of each row of deflector rollers are mounted on a common shaft extending across and beyond the entire width of the web and the ends of the shafts of the two rows are carried by the rrns of twoarmed pivotable levers disposed adjacent the longitudinal edges of the web, the pivotal axes of th levers lying in the plane of the web and the levers being pivotable to and fro in sequence with the operating cycle of the machine.

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  • Making Paper Articles (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)
US00120916A 1970-03-09 1971-03-04 Tear-off apparatus for successively tearing off a length from the leading end of a moving flattened tubular web of material Expired - Lifetime US3727814A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702011101 DE2011101C (de) 1970-03-09 Vorrichtung zum Abreißen von Bahnstücken von einer mit Querperforationen versehenen Materialbann

Publications (1)

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US3727814A true US3727814A (en) 1973-04-17

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US00120916A Expired - Lifetime US3727814A (en) 1970-03-09 1971-03-04 Tear-off apparatus for successively tearing off a length from the leading end of a moving flattened tubular web of material

Country Status (4)

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US (1) US3727814A (enExample)
JP (1) JPS5720120B1 (enExample)
FR (1) FR2084307A5 (enExample)
GB (1) GB1326814A (enExample)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3792807A (en) * 1972-07-25 1974-02-19 P Mare Band dispensing apparatus
US3942694A (en) * 1973-09-10 1976-03-09 Canadian Industries Limited Bag severing machine
US4529114A (en) * 1983-09-09 1985-07-16 Moore Business Forms, Inc. Form burster
US6135281A (en) * 1997-04-03 2000-10-24 Simhaee; Ebrahim Continuous roll of plastic bags
US20010014246A1 (en) * 1999-10-16 2001-08-16 Luciano Robert A. Secure printer system for gaming devices
US20030092477A1 (en) * 1999-10-16 2003-05-15 Sierra Design Group Voucher gaming systems and methods
US20050129449A1 (en) * 1999-10-16 2005-06-16 Sierra Design Group Vertically mounted modular printer system
US20050160699A1 (en) * 2004-01-27 2005-07-28 Andrew Perkins Method and apparatus for pre-tearing strings of air-filled packing materials and the like
US20060059865A1 (en) * 2004-09-22 2006-03-23 Free-Flow Packaging International, Inc. Method and apparatus for pre-tearing strings of air-filled packing materials
US20080172989A1 (en) * 2004-08-19 2008-07-24 Gagan Deep Package
US7497362B2 (en) * 1999-10-16 2009-03-03 Bally Gaming, Inc. Printer tear bar and presenter system
US7513401B1 (en) * 2000-06-19 2009-04-07 Bally Gaming, Inc. Printer tear bar and presenter system
CN106384455A (zh) * 2016-11-10 2017-02-08 广东金赋科技股份有限公司 一种防多出票装置及出票机
US10357954B2 (en) * 2015-11-04 2019-07-23 Koenig & Bauer Ag Separating device for separating sections from a material web, laminating machine comprising a separating device, and method for laminating a sheet of a material web and for separating at least one section from a material web

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6012466A (ja) * 1983-06-30 1985-01-22 Toshiba Corp 連続紙の裂断装置
US5390875A (en) * 1992-05-01 1995-02-21 Cmd Corporation Method and apparatus for interleaving plastic bags
US5362013A (en) * 1992-05-01 1994-11-08 Custom Machinery Design, Inc. Method and apparatus for interleaving plastic bags
US5377929A (en) * 1992-05-01 1995-01-03 Custom Machinery Design, Inc. Method and apparatus for interleaving plastic bags
US5979729A (en) * 1996-03-11 1999-11-09 Cmd Corporation Separating a web at a line of weakness

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2375542A (en) * 1944-03-16 1945-05-08 United Autographic Register Co Bursting machine
US2875689A (en) * 1953-04-01 1959-03-03 R L Crain Ltd Strip printer and burster
US3135446A (en) * 1963-01-21 1964-06-02 Moore Business Forms Inc Strip severing machines
US3484031A (en) * 1967-07-20 1969-12-16 Uarco Inc Stationery burster

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2375542A (en) * 1944-03-16 1945-05-08 United Autographic Register Co Bursting machine
US2875689A (en) * 1953-04-01 1959-03-03 R L Crain Ltd Strip printer and burster
US3135446A (en) * 1963-01-21 1964-06-02 Moore Business Forms Inc Strip severing machines
US3484031A (en) * 1967-07-20 1969-12-16 Uarco Inc Stationery burster

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3792807A (en) * 1972-07-25 1974-02-19 P Mare Band dispensing apparatus
US3942694A (en) * 1973-09-10 1976-03-09 Canadian Industries Limited Bag severing machine
US4529114A (en) * 1983-09-09 1985-07-16 Moore Business Forms, Inc. Form burster
US6379292B1 (en) 1997-04-03 2002-04-30 Ebrahim Simhaee Continuous roll of plastic bags
US6135281A (en) * 1997-04-03 2000-10-24 Simhaee; Ebrahim Continuous roll of plastic bags
US7497362B2 (en) * 1999-10-16 2009-03-03 Bally Gaming, Inc. Printer tear bar and presenter system
US20010014246A1 (en) * 1999-10-16 2001-08-16 Luciano Robert A. Secure printer system for gaming devices
US6814518B2 (en) 1999-10-16 2004-11-09 Sierra Design Group Secure printer system for gaming devices
US20050129449A1 (en) * 1999-10-16 2005-06-16 Sierra Design Group Vertically mounted modular printer system
US7862418B2 (en) 1999-10-16 2011-01-04 Bally Gaming, Inc. Voucher gaming systems and methods
US20030092477A1 (en) * 1999-10-16 2003-05-15 Sierra Design Group Voucher gaming systems and methods
US7314324B2 (en) 1999-10-16 2008-01-01 Sierra Design Group Vertically mounted modular printer system
US7513401B1 (en) * 2000-06-19 2009-04-07 Bally Gaming, Inc. Printer tear bar and presenter system
US7343723B2 (en) * 2004-01-27 2008-03-18 Free-Flow Packaging International, Inc. Method and apparatus for pre-tearing strings of air-filled packing materials and the like
US20050160699A1 (en) * 2004-01-27 2005-07-28 Andrew Perkins Method and apparatus for pre-tearing strings of air-filled packing materials and the like
US20080172989A1 (en) * 2004-08-19 2008-07-24 Gagan Deep Package
WO2006036270A3 (en) * 2004-09-22 2006-08-03 Free Flow Packaging Int Inc Method and apparatus for pre-tearing strings of air-filled packing materials
US20060059865A1 (en) * 2004-09-22 2006-03-23 Free-Flow Packaging International, Inc. Method and apparatus for pre-tearing strings of air-filled packing materials
US10357954B2 (en) * 2015-11-04 2019-07-23 Koenig & Bauer Ag Separating device for separating sections from a material web, laminating machine comprising a separating device, and method for laminating a sheet of a material web and for separating at least one section from a material web
CN106384455A (zh) * 2016-11-10 2017-02-08 广东金赋科技股份有限公司 一种防多出票装置及出票机

Also Published As

Publication number Publication date
JPS5720120B1 (enExample) 1982-04-26
GB1326814A (en) 1973-08-15
DE2011101A1 (de) 1971-10-07
FR2084307A5 (enExample) 1971-12-17

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