WO1999058306A1 - Adjusting mechanism for a blade clearance in a twin rotary cutter - Google Patents

Adjusting mechanism for a blade clearance in a twin rotary cutter Download PDF

Info

Publication number
WO1999058306A1
WO1999058306A1 PCT/FI1999/000327 FI9900327W WO9958306A1 WO 1999058306 A1 WO1999058306 A1 WO 1999058306A1 FI 9900327 W FI9900327 W FI 9900327W WO 9958306 A1 WO9958306 A1 WO 9958306A1
Authority
WO
WIPO (PCT)
Prior art keywords
blade
cutter
set forth
rotary cutter
adjusting mechanism
Prior art date
Application number
PCT/FI1999/000327
Other languages
French (fr)
Inventor
Martti Karhu
Original Assignee
Valmet Corporation
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 Valmet Corporation filed Critical Valmet Corporation
Priority to AU35244/99A priority Critical patent/AU3524499A/en
Publication of WO1999058306A1 publication Critical patent/WO1999058306A1/en

Links

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
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/26—Means for mounting or adjusting the cutting member; Means for adjusting the stroke of the cutting member
    • B26D7/2614—Means for mounting the cutting member
    • 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
    • B26D1/56—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 travels with the work otherwise than in the direction of the cut, i.e. flying cutter
    • B26D1/62—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 travels with the work otherwise than in the direction of the cut, i.e. flying cutter and is rotating about an axis parallel to the line of cut, e.g. mounted on a rotary cylinder
    • B26D1/626—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 travels with the work otherwise than in the direction of the cut, i.e. flying cutter and is rotating about an axis parallel to the line of cut, e.g. mounted on a rotary cylinder for thin material, e.g. for sheets, strips or the like
    • 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
    • B26D7/26—Means for mounting or adjusting the cutting member; Means for adjusting the stroke of the cutting member
    • B26D7/2628—Means for adjusting the position of the cutting member

Definitions

  • the present invention relates to an adjusting mechanism for a blade clearance in a twin rotary cutter, a web to be cut in said cutter being guided through be- tween two rotating rolls, one of which is provided with a solid blade and the other roll with an adjustable cutter blade.
  • the cutting process is based on a rotating cross-cutting blade and a solid counter- blade.
  • the aim is to provide a good cutting trace.
  • Requirements for a good cutting trace include permanently sharp blades and a controlled blade clearance.
  • the technical solution will be extremely expensive in the present-day mechanisms which involve a rotating cutting blade and a counter-blade.
  • the pulp web is subjected to compression between the blades before the web is cut.
  • the edge areas of a sheet develop a pulp material compression at the edges and material build-ups ("fish eyes").
  • such material build-ups are not desir- able, while the cutting trace itself need not be particularly good since, after all, the cut pulp sheet will be processed further.
  • An object of the invention is to eliminate such a foregoing clearance of the cutting blades, which impedes a web cutting process.
  • a mechanism of the invention is characterized in that the adjustable blade is provided with a press element for subjecting the blade to a force controlling its position.
  • the press element has a compression force which can be regulated, said press element comprising, in a pre- ferred case, a hydraulically or pneumatically loaded elastic bellows or tube.
  • a mechanism of the invention offers the following benefits over a mechanical blade suspension: 2 pressure compensates for blade wear
  • the invention relates also to a method for adjusting a blade clearance in a twin rotary cutter, said method being characterized in that an adjustable blade is subjected to a force controlling the blade position.
  • this adjustment is effected in such a way that the pressure of a pressure medium to be fed into an elastic press element in contact with an adjustable blade is regulated for achieving a desired position for the blade element and for eliminating a developed clearance.
  • the press element is fitted with a pneumatic or hydraulic source of pressure, which uses a control unit and a supply valve for regulating the level of pressure to be fed into the press element.
  • the pressure medium can be a gas or a fluid.
  • Fig. 1 shows a solution of the invention in principle
  • fig. 2 shows a cutting blade with its fastening holes
  • fig. 3 shows an adjustment system for a blade of the invention with its control unit
  • fig. 4 shows the system of fig. 3, but manually implemented.
  • Fig. 1 shows two rolls 1 and 3, the lower being provided with a solid counter- blade 2 extending from the outer roll surface.
  • the upper or overhead roll 3 is provided with a blade 4, which is in cooperation with the counter-blade 2 and has its position adjustable in accordance with the invention.
  • the 3 adjustable blade 4 can be optionally mounted on the lower roll 1 and the solid blade 2 on the upper roll 3.
  • the blade 4 is fitted in a recess included in the outer surface of the roll 3, the blade 4 being secured in said recess by means of a fastening bolt 10 with the help of an attachment mounted on the roll.
  • the attachment is provided with a fastening peg 11 projecting into the recess for attachment apertures 12 present in the blade 4.
  • the blade 4 can be provided with one or more apertures. In the embodiment shown in fig. 2, the apertures are elongated in shape for an easier attachment of the blade.
  • the blade 4 positions itself along the other side of the recess with a slight leeway and projects from the outer surface of the roll 3.
  • the blades 2 and 4 have such a dimensioning that, at a point of cutting, the blades will meet each other in the illustrated fashion for cutting a web.
  • the recess is partially closed by a plate 7 restricting the movement of the blade.
  • the press element As shown in figs. 3 and 4, the press element, an elastic tube 5 in the case of fig. 1 , is connected with a source of pressure 13, which can be hydraulic or pneumatic.
  • the pressure source has its feeding line fitted with a valve 15, which in turn is in communication with a control unit 14.
  • This control unit 14 receives its set values from a detector 16, which is mounted on a conveyor and may respond to possible breaks or other malfunctions.
  • the roll 3 is machined to include a cut-out 8, which is provided with an adjusting screw 9 extending all the way to the blade 4 for effecting a rough adjust- ment of the blade 4.
  • the actual adjustment of clearance is carried out by supplying the elastic bellows 5 with a pressure medium, which can be a gas, e.g. air, or a hydraulic fluid.
  • a pressure medium which can be a gas, e.g. air, or a hydraulic fluid.
  • the expanding bellows 5 presses against the blade 4 and forces the 4 same towards the recess wall.
  • a possible clearance between the blades can be adjusted.
  • the apparatus and method of the invention can be used for eliminating possible disturbance factors in cutting, which result from vibrations and deflections of the rolls.
  • cardboard cutters for example, the foregoing aspects have been limiting factors in terms of increasing the operating width.
  • wearing of the blades can be compensated for and, by virtue of a simple structure, the mass of rolls can be reduced and, thus, the deflection of rolls will be reduced as well.

Abstract

The invention relates to an adjusting mechanism for a blade clearance in a twin rotary cutter, a web to be cut in said cutter being guided through between two rotating rolls (1, 3), one of which is provided with a solid blade (2) and the other roll with an adjustable cutter blade (4). The adjustable blade is provided with a press element (5) for subjecting the blade to a force controlling its position. The invention relates also to a method for adjusting the above-mentioned blade clearance. In this method, the adjustable blade is subjected to a force regulating the blade position. The invention relates further to a twin rotary cutter for cross-cutting a web-like material (4), such as a pulp web, said cutter making use of the above-described mechanism and method.

Description

Adjusting mechanism for a blade clearance in a twin rotary cutter
The present invention relates to an adjusting mechanism for a blade clearance in a twin rotary cutter, a web to be cut in said cutter being guided through be- tween two rotating rolls, one of which is provided with a solid blade and the other roll with an adjustable cutter blade.
In the prior art cross-cutting mechanisms used in a pulp-drying machine, the cutting process is based on a rotating cross-cutting blade and a solid counter- blade. The aim is to provide a good cutting trace. Requirements for a good cutting trace include permanently sharp blades and a controlled blade clearance. As the machines become wider and wider, the control of a blade clearance will be increasingly difficult, if not impossible. In any event, the technical solution will be extremely expensive in the present-day mechanisms which involve a rotating cutting blade and a counter-blade. At the cutting point, the pulp web is subjected to compression between the blades before the web is cut. In such a cutting process, the edge areas of a sheet develop a pulp material compression at the edges and material build-ups ("fish eyes"). In terms of the further processing of a pulp sheet, such material build-ups are not desir- able, while the cutting trace itself need not be particularly good since, after all, the cut pulp sheet will be processed further.
An object of the invention is to eliminate such a foregoing clearance of the cutting blades, which impedes a web cutting process. A mechanism of the invention is characterized in that the adjustable blade is provided with a press element for subjecting the blade to a force controlling its position.
In order to facilitate the practical operation, the press element has a compression force which can be regulated, said press element comprising, in a pre- ferred case, a hydraulically or pneumatically loaded elastic bellows or tube.
A mechanism of the invention offers the following benefits over a mechanical blade suspension: 2 pressure compensates for blade wear
"run without a web" - condition = pressure off, consequently no wearing of blades
The invention relates also to a method for adjusting a blade clearance in a twin rotary cutter, said method being characterized in that an adjustable blade is subjected to a force controlling the blade position.
In a preferred case, this adjustment is effected in such a way that the pressure of a pressure medium to be fed into an elastic press element in contact with an adjustable blade is regulated for achieving a desired position for the blade element and for eliminating a developed clearance. In practice, the press element is fitted with a pneumatic or hydraulic source of pressure, which uses a control unit and a supply valve for regulating the level of pressure to be fed into the press element.
The pressure medium can be a gas or a fluid.
The invention will be described in more detail with reference made to the ac- companying drawings.
Fig. 1 shows a solution of the invention in principle,
fig. 2 shows a cutting blade with its fastening holes,
fig. 3 shows an adjustment system for a blade of the invention with its control unit, and
fig. 4 shows the system of fig. 3, but manually implemented.
Fig. 1 shows two rolls 1 and 3, the lower being provided with a solid counter- blade 2 extending from the outer roll surface. The upper or overhead roll 3 is provided with a blade 4, which is in cooperation with the counter-blade 2 and has its position adjustable in accordance with the invention. Naturally, the 3 adjustable blade 4 can be optionally mounted on the lower roll 1 and the solid blade 2 on the upper roll 3.
The blade 4 is fitted in a recess included in the outer surface of the roll 3, the blade 4 being secured in said recess by means of a fastening bolt 10 with the help of an attachment mounted on the roll. The attachment is provided with a fastening peg 11 projecting into the recess for attachment apertures 12 present in the blade 4. The blade 4 can be provided with one or more apertures. In the embodiment shown in fig. 2, the apertures are elongated in shape for an easier attachment of the blade.
Between the attachment and the outer periphery remains an interspace, in which is accommodated a tube-like bellows 5 that is elastic and substantially fills the available space within the recess. The blade 4 positions itself along the other side of the recess with a slight leeway and projects from the outer surface of the roll 3. The blades 2 and 4 have such a dimensioning that, at a point of cutting, the blades will meet each other in the illustrated fashion for cutting a web. The recess is partially closed by a plate 7 restricting the movement of the blade.
As shown in figs. 3 and 4, the press element, an elastic tube 5 in the case of fig. 1 , is connected with a source of pressure 13, which can be hydraulic or pneumatic. The pressure source has its feeding line fitted with a valve 15, which in turn is in communication with a control unit 14. This control unit 14 receives its set values from a detector 16, which is mounted on a conveyor and may respond to possible breaks or other malfunctions.
The roll 3 is machined to include a cut-out 8, which is provided with an adjusting screw 9 extending all the way to the blade 4 for effecting a rough adjust- ment of the blade 4.
The actual adjustment of clearance is carried out by supplying the elastic bellows 5 with a pressure medium, which can be a gas, e.g. air, or a hydraulic fluid. The expanding bellows 5 presses against the blade 4 and forces the 4 same towards the recess wall. Thus, a possible clearance between the blades can be adjusted.
Alternatively, of course, it is possible to discharge a pressure medium from the bellows for effecting a blade adjustment in the other direction.
The apparatus and method of the invention can be used for eliminating possible disturbance factors in cutting, which result from vibrations and deflections of the rolls. In cardboard cutters, for example, the foregoing aspects have been limiting factors in terms of increasing the operating width. At the same time, wearing of the blades can be compensated for and, by virtue of a simple structure, the mass of rolls can be reduced and, thus, the deflection of rolls will be reduced as well.

Claims

Claims
1. An adjusting mechanism for a blade clearance in a twin rotary cutter, a web to be cut in said cutter being guided through between two rotating rolls (1 , 3), one of which is provided with a solid blade (2) and the other roll with an adjustable cutter blade (4), characterized in that the adjustable blade is provided with a press element (5) for subjecting the blade to a force controlling its position.
2. An adjusting mechanism as set forth in claim 1 , characterized in that the press element (5) has a compression force which can be regulated.
3. An adjusting mechanism as set forth in claim 1 , characterized in that the press element (5) comprises a hydraulically or pneumatically chargeable elastic bellows or tube.
4. An adjusting mechanism as set forth in claim 1 , characterized in that the twin rotary cutter is included in the sheet cutting unit of a pulp-drying machine.
5. An adjusting mechanism as set forth in claim 1 , characterized in that the blade (4) is provided with elongated attachment holes (12).
6. An adjusting mechanism as set forth in claim 2, characterized in that the mechanism comprises an extra-cutter source (13) and regulating assembly (14, 15) for compression force.
7. A method for adjusting a blade clearance in a twin rotary cutter, characterized in that an adjustable blade is subjected to a force regulating the blade position.
8. A method as set forth in claim 7, characterized in that the regulation of pressure is used for compensating for the wearing of blades (2, 4).
9. A twin rotary cutter for cross-cutting a web-like material (4), such as a pulp web, comprising two rotatable rolls (1 , 3) or the like, the web (4) to be cut being 6 guided therethrough, and one of which is provided with a fixedly mounted blade (2) and the other with an adjustable cutter blade (4), characterized in that the adjustable blade (4) is secured to a second roll (3) or the like by means of a press element (5), having a blade-position regulating force which can be set/adjusted while the cutter is running.
10. A twin rotary cutter as set forth in claim 9, characterized in that the press element comprises a hydraulically and/or pneumatically chargeable bellows (5) or tube or a plurality of bellows or tubes means (13-15) in a functional communication with the cutter for setting a hydraulic and/or pneumatic force.
11. A twin rotary cutter as set forth in claim 10, characterized in that the means (13-15) in a functional communication with the cutter for setting a hydraulic and/or pneumatic force include at least one pressure adjusting valve (15).
12. A twin rotary cutter as set forth in claim 10, characterized in that the press elements include a control assembly (14) which, after receiving information about a web break (16), is able to release a hydraulic and/or pneumatic force with the press element.
PCT/FI1999/000327 1998-05-11 1999-04-22 Adjusting mechanism for a blade clearance in a twin rotary cutter WO1999058306A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU35244/99A AU3524499A (en) 1998-05-11 1999-04-22 Adjusting mechanism for a blade clearance in a twin rotary cutter

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI981036A FI981036A (en) 1998-05-11 1998-05-11 Control device for the loss of the bite in a double rotation cutting machine
FI981036 1998-05-11

Publications (1)

Publication Number Publication Date
WO1999058306A1 true WO1999058306A1 (en) 1999-11-18

Family

ID=8551691

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1999/000327 WO1999058306A1 (en) 1998-05-11 1999-04-22 Adjusting mechanism for a blade clearance in a twin rotary cutter

Country Status (3)

Country Link
AU (1) AU3524499A (en)
FI (1) FI981036A (en)
WO (1) WO1999058306A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005051616A1 (en) * 2003-11-24 2005-06-09 G.D Societa' Per Azioni Method for predictive maintenance of a cutting unit of an automatic machine
CN102102669A (en) * 2009-12-16 2011-06-22 东芝开利株式会社 Multi-cylinder rotary compressor and refrigeration circulation device
WO2012146791A1 (en) * 2011-04-28 2012-11-01 Pasaban, S.A. Device for the transverse cutting of cellulose-pulp bands
CN106078919A (en) * 2016-08-25 2016-11-09 坂崎雕刻模具（昆山）有限公司 A kind of rotor blade is spacing and waste discharge apparatus

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2021061A1 (en) * 1970-04-29 1971-11-11 Strecker Otto C Dr Kg Knife arrangement for a cross cutter
DE2128871A1 (en) * 1971-06-11 1972-12-21 Will E C H Fa Cross cutter for cutting sheets from a paper strip or the like!
DE3507929A1 (en) * 1985-03-06 1986-09-11 Maschinenfabrik Goebel Gmbh, 6100 Darmstadt KNIFE CYLINDERS FOR PROCESSING RAILWAY GOODS
DE3928594A1 (en) * 1989-08-29 1991-03-07 Strecker Valmet KNIFE DRUM FOR ROTATIONAL CONTINUOUS CUTTERS WITH SHEARING CUT
SE469217B (en) * 1991-11-25 1993-06-07 Rolf Arne Larsson Device for securing a knife blade for cutting of a paper web
SE469940B (en) * 1992-01-14 1993-10-11 Rolf Arne Larsson Device for holding knife blades in a cylinder intended for machining a running track
FI101352B (en) * 1994-12-28 1998-06-15 Gma Printing Syst Ab Oy Paper sheet cross-cutter

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2021061A1 (en) * 1970-04-29 1971-11-11 Strecker Otto C Dr Kg Knife arrangement for a cross cutter
DE2128871A1 (en) * 1971-06-11 1972-12-21 Will E C H Fa Cross cutter for cutting sheets from a paper strip or the like!
DE3507929A1 (en) * 1985-03-06 1986-09-11 Maschinenfabrik Goebel Gmbh, 6100 Darmstadt KNIFE CYLINDERS FOR PROCESSING RAILWAY GOODS
DE3928594A1 (en) * 1989-08-29 1991-03-07 Strecker Valmet KNIFE DRUM FOR ROTATIONAL CONTINUOUS CUTTERS WITH SHEARING CUT
SE469217B (en) * 1991-11-25 1993-06-07 Rolf Arne Larsson Device for securing a knife blade for cutting of a paper web
SE469940B (en) * 1992-01-14 1993-10-11 Rolf Arne Larsson Device for holding knife blades in a cylinder intended for machining a running track
FI101352B (en) * 1994-12-28 1998-06-15 Gma Printing Syst Ab Oy Paper sheet cross-cutter

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005051616A1 (en) * 2003-11-24 2005-06-09 G.D Societa' Per Azioni Method for predictive maintenance of a cutting unit of an automatic machine
US7561940B2 (en) 2003-11-24 2009-07-14 G.D. Societa' Per Azioni Method for predictive maintenance of a cutting unit of an automatic machine
CN102102669A (en) * 2009-12-16 2011-06-22 东芝开利株式会社 Multi-cylinder rotary compressor and refrigeration circulation device
WO2012146791A1 (en) * 2011-04-28 2012-11-01 Pasaban, S.A. Device for the transverse cutting of cellulose-pulp bands
CN106078919A (en) * 2016-08-25 2016-11-09 坂崎雕刻模具（昆山）有限公司 A kind of rotor blade is spacing and waste discharge apparatus

Also Published As

Publication number Publication date
AU3524499A (en) 1999-11-29
FI981036A0 (en) 1998-05-11
FI981036A (en) 1999-11-12

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