EP2311610B1 - A tool for separating cardboard blanks - Google Patents

A tool for separating cardboard blanks Download PDF

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Publication number
EP2311610B1
EP2311610B1 EP10187647.2A EP10187647A EP2311610B1 EP 2311610 B1 EP2311610 B1 EP 2311610B1 EP 10187647 A EP10187647 A EP 10187647A EP 2311610 B1 EP2311610 B1 EP 2311610B1
Authority
EP
European Patent Office
Prior art keywords
string
bolt
tool
blanks
bar
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.)
Not-in-force
Application number
EP10187647.2A
Other languages
German (de)
French (fr)
Other versions
EP2311610A1 (en
Inventor
Kazimierz Borowiecki
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.)
Zaklad Produkcji Opakowan Karton-Pak SA
Original Assignee
Zaklad Produkcji Opakowan Karton-Pak SA
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 Zaklad Produkcji Opakowan Karton-Pak SA filed Critical Zaklad Produkcji Opakowan Karton-Pak SA
Priority to PL10187647T priority Critical patent/PL2311610T3/en
Publication of EP2311610A1 publication Critical patent/EP2311610A1/en
Application granted granted Critical
Publication of EP2311610B1 publication Critical patent/EP2311610B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
    • B26D1/547—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a wire-like cutting member
    • B26D1/553—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a wire-like cutting member with a plurality of wire-like cutting members
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/18—Means for removing cut-out material or waste
    • B26D7/1818—Means for removing cut-out material or waste by pushing out
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/18—Means for removing cut-out material or waste
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F3/00—Severing by means other than cutting; Apparatus therefor
    • B26F3/002—Precutting and tensioning or breaking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/18—Means for removing cut-out material or waste
    • B26D2007/189—Mounting blanking, stripping and break-out tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting

Definitions

  • the object of the invention is a tool for separating cardboard blanks.
  • a large cardboard sheet may comprise even dozens of blanks arranged adjacently to each other, separated by cutting lines with small bridges for holding together the blanks during transport within a cutting machine between individual stations of the machine (cutting-waste stripping-separating).
  • the blanks can be separated from each other at a blanks separating device, comprising a lower tool in the shape of a grid having a pattern corresponding to the blanks and an upper tool with a plurality of pushers, configured to push the blanks via the apertures of lower tool and thus break the bridges between the blanks and separate the blanks.
  • a blanks separating device comprising a lower tool in the shape of a grid having a pattern corresponding to the blanks and an upper tool with a plurality of pushers, configured to push the blanks via the apertures of lower tool and thus break the bridges between the blanks and separate the blanks.
  • An exemplary blanks separating device is presented in a US patent No. US5810333 .
  • the lower tool comprises a plurality of lengthwise bars and crosswise bars disposed in a pattern to form apertures in the location, shape and size of the banks. Such type of device is effective during normal operating conditions, but is highly susceptible to faulty conditions.
  • the separated blank may clog the device when the pushers of the upper tool are activated.
  • the pressure exerted by the pushers of the upper tool may bend the bars and therefore destroy the lower tool. This may cause a long delay of the cardboard articles manufacturing process, requiring repair of the lower tool or installation of a new one.
  • Blank separating devices comprising a combination of bars and strings for separating blanks are known from European patent applications no. EP0343338 and EP0152214 , upon which the preamble of claim 1 is based.
  • EP0343338 and EP0152214 upon which the preamble of claim 1 is based.
  • these documents do not disclose means for tensioning the strings, which are of utmost importance in order to guarantee proper operation of the device at high speeds, when the strings must withstand large impact forces of the blanks.
  • a German utility model DE20016800 describes a string tensioner comprising a rotatable bolt, around which the string is rotated in parallel to the string tension direction, and a vice configured to tension the loose end of the string behind the bolt.
  • Such string tensioner is relatively hard to operate, as it requires constant adjustment of the string with respect to the bolt and requires high clamping force between the vice and the string in order to provide sufficient string tension.
  • a PCT Application WO9422644 describes a cardboard blanks separator with strings tensioned by a string tensioner.
  • the tensioner comprises a bolt around which the string is wound, but no details are given about means to immobilize the string or the bolt.
  • the aim of the present invention is to provide a tool for separating cardboard blanks which is more immune to faulty conditions and situations which may arise during operation of the blanks separating device and is easier to repair in case of misalignment of blanks sheet causing faulty conditions, which furthermore allows separation of long and narrow blanks.
  • the object of the invention is a tool for separating cardboard blanks from a blanks sheet, comprising a frame with a pair of longitudinal bars parallel to the direction of positioning the sheet over the tool, a pair of transverse bars and at least one cutting bar with a plurality of openings, extending between the transverse bars, and a plurality of strings, each string extending between a string holder mounted on one longitudinal bar , the opening of the cutting bar and a string tensioner mounted on the other longitudinal bar, wherein each string extends at least 5 mm below the top edge of the cutting bar (105) and wherein the string tensioner comprises a rotatable bolt with string attachment opening, the bolt configured to rotate around an axis perpendicular to the string tension direction so as to steplessly tension the string and a bolt clamp having a form of a vice configured to act directly on the bolt so as to immobilize the bolt, the vice operable by means of a screw.
  • the string attachment opening (123) is offset in the axial direction of the bolt (122) from a stationary (124) and movable (125) part of the bolt clamp
  • Fig. 1 shows a tool for separating cardboard blanks according to the invention
  • Fig. 2 shows details of a string tensioner.
  • Fig. 1 shows a tool for separating cardboard blanks according to the invention, which may form a lower tool of a conventional blanks separating device.
  • the tool comprises a peripheral frame comprising longitudinal bars 101, 102 and transverse bars 103, 104.
  • the longitudinal bars 101, 102 are positioned in parallel to the direction in which the blanks sheet enters over the tool.
  • At least one cutting bar 105 with a plurality of openings 106 extends between the transverse bars 103, 104.
  • the openings 106 increase the stability of tool operation, as explained below.
  • the cutting bar is a flat bar.
  • the tool further comprises a plurality of strings 110, wherein each string 110 extends between a string holder 111 mounted on one longitudinal bar 101, the opening 106 of the cutting bar 105 and a string tensioner 121 mounted on the other longitudinal bar 102, at the tool maintenance side. All string holders 111 may be located on one longitudinal bar 101 and all string tensioners 121 on the other longitudinal bar 102, which makes string tensioning easy for the tool operator.
  • the cutting bar 105 is made of steel and has a thickness in the range of 3-5mm, which guarantees its strength.
  • the cutting bar 105 comprises bends at its top portion, which facilitate separation of the sheet to strips.
  • the top edge of the bar 105 is 5-10mm above the strings 110.
  • the strings are made of steel or a steel cord, having 2-3 mm in diameter.
  • the strings 110 have to be appropriately tensioned.
  • the strings 110 are statically secured at one end at string holders 111. From a string holder 111, each string passes via appropriate openings 106 in the cutting bars 105 and is secured to a string tensioner 121, shown in details in Fig. 2 .
  • the string tensioner 121 comprises a rotatable bolt 122 with string attachment opening 123, configured to rotate around an axis perpendicular to the string tension direction so as to tension the string.
  • the string 110 enters the string tensioner 121 via an opening 127, which sets the position of the string within the tool. After the string is tensioned by the bolt 122, the bolt may be immobilized by a bolt clamp 124, 125.
  • the bolt clamp 124, 125 may have a form of a vice operable by means of a screw 126, wherein one part of the bolt clamp 124 is static and the other part 125 is movable by turning the screw 126.
  • the bolt clamp 124, 125 may have an internal shape corresponding to the diameter of the bolt 122, so as to increase the area of clamping contact with the bolt.
  • the bolt 122 may be operable by a torque wrench.
  • the tension of the string is adjusted to guarantee stable working conditions, depending on the speed of operation, size of bridges and cardboard.
  • the string tensioner according to the invention provides greater clamp force of the vice and therefore allows achieving greater string tensions than the prior art tensioners, wherein the vice clamps the string rather than the bolt. Furthermore, the tensioner is easy to operate, as the user does not have to manipulate the free end of the string.
  • a blanks sheet When a blanks sheet is positioned over the tool and punched from above, it is first divided by the at least one cutting bar 105 to strips and next by the plurality of strings 110. Since the cutting bars 105 are parallel to the direction of the movement of the sheet over the tool and since the top edge of the cutting bars is above the strings, then even if some blanks fall from the sheet before alignment, the blanks will fall on the strings 110 and not on the cutting bars 105. Then, if the clogged tool is punched from above, the strings may deflect to compensate the clogging. In the worst case, only the clogged strings will break. This will make the tool inoperable, but the repair of the tool will be very simple, as only the broken strings will have to be exchanged, which is a simple and relatively fast operation.
  • the tool facilitates effective separation of narrow blanks, such as blanks narrower than 80 mm without a risk of damage to the blanks.
  • a standard frame as disclosed in US5810333 has relatively wide edges and tends to deform the blank when the blank is pushed via the frame.
  • the tool according to the invention utilizes thin strings, which practically do not affect the shape of the blank when it is pushed via the tool.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Making Paper Articles (AREA)
  • Details Of Cutting Devices (AREA)

Description

  • The object of the invention is a tool for separating cardboard blanks.
  • One of the processing steps of manufacturing of cardboard articles is separation of cardboard blanks from a pre-printed and pre-cut cardboard sheet. A large cardboard sheet may comprise even dozens of blanks arranged adjacently to each other, separated by cutting lines with small bridges for holding together the blanks during transport within a cutting machine between individual stations of the machine (cutting-waste stripping-separating).
  • The blanks can be separated from each other at a blanks separating device, comprising a lower tool in the shape of a grid having a pattern corresponding to the blanks and an upper tool with a plurality of pushers, configured to push the blanks via the apertures of lower tool and thus break the bridges between the blanks and separate the blanks. An exemplary blanks separating device is presented in a US patent No. US5810333 . The lower tool comprises a plurality of lengthwise bars and crosswise bars disposed in a pattern to form apertures in the location, shape and size of the banks. Such type of device is effective during normal operating conditions, but is highly susceptible to faulty conditions. For example, when a blank separates from the sheet of blanks before the sheet is aligned with respect to the lower tool, which may happen when the bridges between the blank are weak, the separated blank may clog the device when the pushers of the upper tool are activated. In an extreme case, where a plurality of blanks separate before alignment, the pressure exerted by the pushers of the upper tool may bend the bars and therefore destroy the lower tool. This may cause a long delay of the cardboard articles manufacturing process, requiring repair of the lower tool or installation of a new one.
  • Blank separating devices comprising a combination of bars and strings for separating blanks are known from European patent applications no. EP0343338 and EP0152214 , upon which the preamble of claim 1 is based. However, these documents do not disclose means for tensioning the strings, which are of utmost importance in order to guarantee proper operation of the device at high speeds, when the strings must withstand large impact forces of the blanks.
  • A German utility model DE20016800 describes a string tensioner comprising a rotatable bolt, around which the string is rotated in parallel to the string tension direction, and a vice configured to tension the loose end of the string behind the bolt. Such string tensioner is relatively hard to operate, as it requires constant adjustment of the string with respect to the bolt and requires high clamping force between the vice and the string in order to provide sufficient string tension.
  • A PCT Application WO9422644 describes a cardboard blanks separator with strings tensioned by a string tensioner. The tensioner comprises a bolt around which the string is wound, but no details are given about means to immobilize the string or the bolt.
  • The aim of the present invention is to provide a tool for separating cardboard blanks which is more immune to faulty conditions and situations which may arise during operation of the blanks separating device and is easier to repair in case of misalignment of blanks sheet causing faulty conditions, which furthermore allows separation of long and narrow blanks.
  • The object of the invention is a tool for separating cardboard blanks from a blanks sheet, comprising a frame with a pair of longitudinal bars parallel to the direction of positioning the sheet over the tool, a pair of transverse bars and at least one cutting bar with a plurality of openings, extending between the transverse bars, and a plurality of strings, each string extending between a string holder mounted on one longitudinal bar , the opening of the cutting bar and a string tensioner mounted on the other longitudinal bar, wherein each string extends at least 5 mm below the top edge of the cutting bar (105) and wherein the string tensioner comprises a rotatable bolt with string attachment opening, the bolt configured to rotate around an axis perpendicular to the string tension direction so as to steplessly tension the string and a bolt clamp having a form of a vice configured to act directly on the bolt so as to immobilize the bolt, the vice operable by means of a screw.
  • Preferably, the string attachment opening (123) is offset in the axial direction of the bolt (122) from a stationary (124) and movable (125) part of the bolt clamp
  • The present invention is shown in an exemplary embodiment on a drawing, in which Fig. 1 shows a tool for separating cardboard blanks according to the invention and Fig. 2 shows details of a string tensioner.
  • Fig. 1 shows a tool for separating cardboard blanks according to the invention, which may form a lower tool of a conventional blanks separating device. The tool comprises a peripheral frame comprising longitudinal bars 101, 102 and transverse bars 103, 104. The longitudinal bars 101, 102 are positioned in parallel to the direction in which the blanks sheet enters over the tool. At least one cutting bar 105 with a plurality of openings 106 extends between the transverse bars 103, 104. The openings 106 increase the stability of tool operation, as explained below. The cutting bar is a flat bar. The tool further comprises a plurality of strings 110, wherein each string 110 extends between a string holder 111 mounted on one longitudinal bar 101, the opening 106 of the cutting bar 105 and a string tensioner 121 mounted on the other longitudinal bar 102, at the tool maintenance side. All string holders 111 may be located on one longitudinal bar 101 and all string tensioners 121 on the other longitudinal bar 102, which makes string tensioning easy for the tool operator. In order to provide efficient blanks separation, the cutting bar 105 is made of steel and has a thickness in the range of 3-5mm, which guarantees its strength. Preferably, the cutting bar 105 comprises bends at its top portion, which facilitate separation of the sheet to strips. Preferably, the top edge of the bar 105 is 5-10mm above the strings 110. The strings are made of steel or a steel cord, having 2-3 mm in diameter.
  • In order to guarantee proper operation of the tool, the strings 110 have to be appropriately tensioned. The strings 110 are statically secured at one end at string holders 111. From a string holder 111, each string passes via appropriate openings 106 in the cutting bars 105 and is secured to a string tensioner 121, shown in details in Fig. 2. The string tensioner 121 comprises a rotatable bolt 122 with string attachment opening 123, configured to rotate around an axis perpendicular to the string tension direction so as to tension the string. The string 110 enters the string tensioner 121 via an opening 127, which sets the position of the string within the tool. After the string is tensioned by the bolt 122, the bolt may be immobilized by a bolt clamp 124, 125. The bolt clamp 124, 125 may have a form of a vice operable by means of a screw 126, wherein one part of the bolt clamp 124 is static and the other part 125 is movable by turning the screw 126. The bolt clamp 124, 125 may have an internal shape corresponding to the diameter of the bolt 122, so as to increase the area of clamping contact with the bolt. In order to guarantee proper tensioning of the string, the bolt 122 may be operable by a torque wrench. The tension of the string is adjusted to guarantee stable working conditions, depending on the speed of operation, size of bridges and cardboard. The string tensioner according to the invention provides greater clamp force of the vice and therefore allows achieving greater string tensions than the prior art tensioners, wherein the vice clamps the string rather than the bolt. Furthermore, the tensioner is easy to operate, as the user does not have to manipulate the free end of the string.
  • When a blanks sheet is positioned over the tool and punched from above, it is first divided by the at least one cutting bar 105 to strips and next by the plurality of strings 110. Since the cutting bars 105 are parallel to the direction of the movement of the sheet over the tool and since the top edge of the cutting bars is above the strings, then even if some blanks fall from the sheet before alignment, the blanks will fall on the strings 110 and not on the cutting bars 105. Then, if the clogged tool is punched from above, the strings may deflect to compensate the clogging. In the worst case, only the clogged strings will break. This will make the tool inoperable, but the repair of the tool will be very simple, as only the broken strings will have to be exchanged, which is a simple and relatively fast operation.
  • In addition, the tool facilitates effective separation of narrow blanks, such as blanks narrower than 80 mm without a risk of damage to the blanks. A standard frame as disclosed in US5810333 has relatively wide edges and tends to deform the blank when the blank is pushed via the frame. In turn, the tool according to the invention utilizes thin strings, which practically do not affect the shape of the blank when it is pushed via the tool.

Claims (2)

  1. A tool for separating cardboard blanks from a blanks sheet, comprising a frame with a pair of longitudinal bars (101, 102) parallel to the direction of positioning the sheet over the tool, a pair of transverse bars (103, 104), at least one cutting bar (105) with a plurality of openings (106), extending between the transverse bars (103, 104), and a plurality of strings (110), characterized in that each string (110) extends between a string holder (111) mounted on one longitudinal bar (101), the opening (106) of the cutting bar (105) and a string tensioner (121) mounted on the other longitudinal bar (102), wherein each string extends 5-10 mm below the top edge of the cutting bar (105) and wherein the string tensioner (121) comprises a rotatable bolt (122) with string attachment opening (123), the bolt (122) configured to rotate around an axis perpendicular to the string tension direction so as to steplessly tension the string and a bolt clamp (124, 125) having a form of a vice configured to act directly on the bolt so as to immobilize the bolt (122), the vice operable by means of a screw (126).
  2. The tool according to claim 1, wherein the string attachment opening (123) is offset in the axial direction of the bolt (122) from a stationary (124) and movable (125) part of the bolt clamp.
EP10187647.2A 2009-10-15 2010-10-15 A tool for separating cardboard blanks Not-in-force EP2311610B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL10187647T PL2311610T3 (en) 2009-10-15 2010-10-15 A tool for separating cardboard blanks

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB0918060.5A GB0918060D0 (en) 2009-10-15 2009-10-15 A tool for separating cardboard blanks
GB0919608.0A GB2474524B (en) 2009-10-15 2009-11-10 A tool for separating cardboard blanks

Publications (2)

Publication Number Publication Date
EP2311610A1 EP2311610A1 (en) 2011-04-20
EP2311610B1 true EP2311610B1 (en) 2013-09-18

Family

ID=41462380

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10187647.2A Not-in-force EP2311610B1 (en) 2009-10-15 2010-10-15 A tool for separating cardboard blanks

Country Status (3)

Country Link
EP (1) EP2311610B1 (en)
GB (2) GB0918060D0 (en)
PL (1) PL2311610T3 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109483625A (en) * 2019-01-03 2019-03-19 河南洪河天地食品有限公司 The cool skin carving knife of steel wire and carving knife

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191126834A (en) * 1911-11-30 1912-09-12 Timothy Charles Hurley An Improved Apparatus for Dividing Butter or the like into Rolls.
GB697389A (en) * 1952-06-27 1953-09-23 Belling & Lee Ltd Improvements in aerial and like supports
GB8401994D0 (en) * 1984-01-26 1984-02-29 Mead Corp Blank separating device
GB8806780D0 (en) * 1988-03-22 1988-04-20 Jowetts Ltd Improvements relating to blanking apparatus
GB2264991A (en) * 1992-02-18 1993-09-15 Mcdowall Wallace Ltd Tensioning devices for elongate, flexible connectors
GB9307211D0 (en) * 1993-04-06 1993-05-26 Mead Corp Improvements in carton blanking units
US5810333A (en) 1997-02-06 1998-09-22 Curtiss Wright Flight Systems Inc. Ram device
DE20016800U1 (en) * 2000-09-29 2001-11-22 Hesse Stanzwerkzeuge Gmbh Panel dividers

Also Published As

Publication number Publication date
GB0918060D0 (en) 2009-12-02
GB2474524B (en) 2012-03-14
GB2474524A (en) 2011-04-20
EP2311610A1 (en) 2011-04-20
PL2311610T3 (en) 2014-03-31
GB0919608D0 (en) 2009-12-23

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