EP0261090A2 - Method and means related to sawing - Google Patents

Method and means related to sawing Download PDF

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Publication number
EP0261090A2
EP0261090A2 EP87850188A EP87850188A EP0261090A2 EP 0261090 A2 EP0261090 A2 EP 0261090A2 EP 87850188 A EP87850188 A EP 87850188A EP 87850188 A EP87850188 A EP 87850188A EP 0261090 A2 EP0261090 A2 EP 0261090A2
Authority
EP
European Patent Office
Prior art keywords
sawing
movement
saw blade
work piece
saw
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.)
Granted
Application number
EP87850188A
Other languages
German (de)
French (fr)
Other versions
EP0261090A3 (en
EP0261090B1 (en
Inventor
Bruno Linnér
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.)
Raute Wood Processing Machinery Oy
Original Assignee
Raute Wood Processing Machinery Oy
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 Raute Wood Processing Machinery Oy filed Critical Raute Wood Processing Machinery Oy
Publication of EP0261090A2 publication Critical patent/EP0261090A2/en
Publication of EP0261090A3 publication Critical patent/EP0261090A3/en
Application granted granted Critical
Publication of EP0261090B1 publication Critical patent/EP0261090B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B3/00—Gang saw mills; Other sawing machines with reciprocating saw blades, specially designed for length sawing of trunks
    • B27B3/02—Gang saw mills; Other sawing machines with reciprocating saw blades, specially designed for length sawing of trunks with vertically-reciprocating saw frame
    • B27B3/12—Mechanisms for producing the reciprocating movement of the saw frame; Arrangements for damping vibration; Arrangements for counter-balancing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B1/00—Methods for subdividing trunks or logs essentially involving sawing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B3/00—Gang saw mills; Other sawing machines with reciprocating saw blades, specially designed for length sawing of trunks

Definitions

  • the present invention relates to a method and to means in sawing, preferably in frame sawing.
  • Frame sawing is a technique used for more than 100 years to saw timber length wise. With “high speed” frames up to 400 strokes/minute is used and about 60 pieces of 5 m long and at the top side 12" thick pine logs can be sawn each hour. A continous feeding of the work piece made it necessary to tilt the saw blades. The "over cutting” arising from this tilting of the blades was tried to be kept at about 55 % of the feeding for each stroke to avoid the blades from to much dragging at initial movement upwards. The sawing took place during just one of the two movements of the frame.
  • the british patent no 1879 from 1874 discloses a frame saw using the two movements of the frame for sawing. This patent describes how slides are tilted to guide the movement of the loose frame to split the saw cut in such a way that sawing is obtained in each direction over just half the work piece In a direction from its middle out towards the edge surfaces. This movement of the saw blades is very unsuitable when sawing e.g. veneer.
  • the british patent 1.187.892 discloses a frame saw technique where the movement of the loose frame is established by two cranks. The sawing movement thus obtained gives the blades a sawing action from one of the edge surfaces towards the centre of the work piece, i.e. this technique should be better suited for sawing e.g. veneer as the splinter of wood at the release side of the blades at least theoretically ought to decrease.
  • this fram sawing technique has shown to be hard to handle in the running production.
  • the swedish patent application 8303296-1 discloses a "power saw", in fact a fram saw technique where the loose frame is guided along tilted slides, their relative angular setting "range between 5° and 45 0 , preferably between 15 0 and 25 0 ". in spite of extensive work of development the technique described in this swedish patent application has not been realized. Among other things a continous feed has been difficult to obtain
  • the main object of the nresent invention is to obtain a sawing technique making It possible to use fram sawing of extremely thin sheets from a work piece continously fed through a loose fram.
  • An other object of the invention is to obtain a sawing technique admitting optimal sawing purposes for different kind of tree species.
  • Still an other object of the present invention is to obtain a sawing technique giving very smooth cutting surfaces also when sawing extremely thin sheets from a work piece.
  • the feeding speed of the work piece automatically adjustable, in one hand in relation to the size of the moving distance of the saw blade towards the work piece and in the other hand in relation to the cutting machinability of the work piece, it is easy to obtain optimal working conditions for different kind of tree spieces.
  • the other end position is shown, i.e. the position from which the working from the other direction is to be started.
  • the "ideal" position has been shown in the figures, i.e. the position where the working is equal at both cutting sections.
  • the cutting sections When sawing a bigger dimensioned work piece, i.e. where the hight is increased and with the same setting of the feeding table, the cutting sections will be of different size as the centre line of the work piece wi I be situated above the centre of the saw blade when this is in a neutral position perpendicular to the work piece.
  • the feeding table is suitably arranged adjustable in several positions.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Sawing (AREA)
  • Mechanical Treatment Of Semiconductor (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Feeding Of Workpieces (AREA)
  • Harvester Elements (AREA)

Abstract

The present invention relates to a method and to means in sawing, preferably in frame sawing.
The method according to the invention is characterized in that the movement of the saw blade is compulsory guided along slides in such a way that the rearward part of the saw blade - seen in the moving direction thereof - is given a movement towards the work piece while the forward part of the blade at the same time is given a movement away from the work piece, at which the ratio between the movement of the saw blade towards respectively from the work piece and the total movement of the sawblade during one sawing cycle is within the range 7:100 - 1:100.
The means according to the invention is characterized in at least two pair of slides (3, 4), along which the saw blade (2) is guided during its movement in both sawing directions, the angle between the slides is in the range between 172° and 179°.

Description

  • The present invention relates to a method and to means in sawing, preferably in frame sawing.
  • Frame sawing is a technique used for more than 100 years to saw timber length wise. With "high speed" frames up to 400 strokes/minute is used and about 60 pieces of 5 m long and at the top side 12" thick pine logs can be sawn each hour. A continous feeding of the work piece made it necessary to tilt the saw blades. The "over cutting" arising from this tilting of the blades was tried to be kept at about 55 % of the feeding for each stroke to avoid the blades from to much dragging at initial movement upwards. The sawing took place during just one of the two movements of the frame.
  • The british patent no 1879 from 1874 discloses a frame saw using the two movements of the frame for sawing. This patent describes how slides are tilted to guide the movement of the loose frame to split the saw cut in such a way that sawing is obtained in each direction over just half the work piece In a direction from its middle out towards the edge surfaces. This movement of the saw blades is very unsuitable when sawing e.g. veneer.
  • The british patent 1.187.892 discloses a frame saw technique where the movement of the loose frame is established by two cranks. The sawing movement thus obtained gives the blades a sawing action from one of the edge surfaces towards the centre of the work piece, i.e. this technique should be better suited for sawing e.g. veneer as the splinter of wood at the release side of the blades at least theoretically ought to decrease. In spite of a hope of less waste regarding to a reduced setting of the teeth of the saw blades, this fram sawing technique has shown to be hard to handle in the running production.
  • The swedish patent application 8303296-1 discloses a "power saw", in fact a fram saw technique where the loose frame is guided along tilted slides, their relative angular setting "range between 5° and 450, preferably between 150 and 250". in spite of extensive work of development the technique described in this swedish patent application has not been realized. Among other things a continous feed has been difficult to obtain
  • The main object of the nresent invention is to obtain a sawing technique making It possible to use fram sawing of extremely thin sheets from a work piece continously fed through a loose fram.
  • An other object of the invention is to obtain a sawing technique admitting optimal sawing purposes for different kind of tree species.
  • Still an other object of the present invention is to obtain a sawing technique giving very smooth cutting surfaces also when sawing extremely thin sheets from a work piece.
  • The objects above according to the present invention are obtained by giving the method and means the characteristics mentioned in the accompanying claims.
  • By compulsory guiding the movement of the saw blade along slides in such a way that the rearward part of the saw blade - seen in the moving direction thereof - is given a movement towards the work piece, while the forward part of the blade at the same time is given a movement away from the work piece, at which the ratio between the movement of the saw blade toward respectively from the work piece and the total movement of the sawblade is within the range 7:100 - 1:100, it has surprisingly shown to be possible to saw extremely thin sheets from a work piece by using thin saw blades without set teeth and with an effectiv chip transport.
  • By the fact that the sawing only takes place from the outside surfaces of the work piece toward the centre of it, splinting, when the blade leaves the work piece, is effectively prevented.
  • By arranging the feeding of the work piece towards the saw blade in such a way, that the ratio between the feeding distance of the work piece and the moving distance of the saw blade is in the range 4:100 and 1:100, it has succeded to saw sheets of veneer with a thickness of just 1 mm out of a work piece.
  • By arranging the the feeding speed of the work piece automatically adjustable, in one hand in relation to the size of the moving distance of the saw blade towards the work piece and in the other hand in relation to the cutting machinability of the work piece, it is easy to obtain optimal working conditions for different kind of tree spieces.
  • The invention will now be described in the following with reference to an example shown in the accompanying drawings, in which:-
    • Fig. I schematically shows a neutral initial position of a saw blad and a work piece,
    • Fig. 2 shows one of the end positions of the saw blade during sawing,
    • Fig. 3 shows the other end positions of the saw blade during sawing, and
    • Fig. 4 shows a perspective view of a set of saw blades for a loose frame designed to work according to the principles of this invention.
  • In fig. 1 the work piece and the saw blade 2 are shown. The saw blade is guided on slides 3 and 4, their relative angular setting beeing in the range between 1720 and 1790. Thus, in the figure - to make it more clear - the angle shown has been strongly exaggerated.
  • In fig. 2 the saw blade 2 has taken one of the end positions and at the same time the work piece has been shown in a position for accomplishing working Thus, there is just the "rearward" part of the saw blade 2 coming into contact with the work piece 1 during working action.
  • In fig. 3 the other end position is shown, i.e. the position from which the working from the other direction is to be started. To be noted in regard to the outlook of the two different kind of cutting sections 5 and 6, the "ideal" position has been shown in the figures, i.e. the position where the working is equal at both cutting sections. When sawing a bigger dimensioned work piece, i.e. where the hight is increased and with the same setting of the feeding table, the cutting sections will be of different size as the centre line of the work piece wi I be situated above the centre of the saw blade when this is in a neutral position perpendicular to the work piece. To obtain optimal working conditions for more than one dimension the feeding table is suitably arranged adjustable in several positions.
  • In fig. 4 a set of saw blades for a loose frame designed to work according to the principles of this invention is shown.
  • The invention Is not restricted to the embodiments described above, but modifications can be made within the scoop of the following claims.

Claims (6)

1. Method in sawing with at least one saw blade where the sawing occurs in both directions of sawing and where the saw blade during its movement is forced to perform a swinging movement through slides arranged in angle set guides and at the same time the work piece is continously fed against the saw blade, characterized in that the movement of the saw blade is compulsory guided along slides in such a way that the rearward part of the saw blade - seen in the moving direction thereof - is given a movement towards the work piece while the forward part of the blade at the same time is given a movement away from the work piece, at which the ratio between the movement of the saw blade towards respectively from the work piece and the total movement of the sawblade during one sawing cycle is within the range 7:100 - 1:100.
2. Method according to claim 1, characterized in that the sawing only takes place from the outside surfaces of the work piece toward the centre of it.
3. Method according to claim 1, wherein several saw blades are arranged in a saw frame, characterized in that centrally to the frame a crank is connected and gives the saw frame a movement in the two sawing directions.
4. Method according to one or several of the preceeding claims 1 - 3, characterized in that the the ratio between the feeding distance of the work piece and the moving distance of the saw blade is in the range 4:100 and 1:100.
5. Method according to one or several of preceeding claims, characterized in that the the feeding speed of the work piece is automatically adjustable, in one hand in relation to the size of the moving distance of the saw blade towards the work piece and in the other hand in relation to the cutting machinability of the work piece.
6. Sawing means using at least one saw blade where the sawing occurs in both directions of sawing and where the saw blade during its movement is forced to perform a swinging movement through slides arranged in angle set guides and at the same time as the work piece is continously fed against the saw blade characterized in at least two pair of slides (3,4), along which the saw blade (2) is guided during its movement in both sawing directions, the angle between the slides is in the range between 1720 and 1790.
EP87850188A 1986-06-12 1987-06-10 Method and means related to sawing Expired - Lifetime EP0261090B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8602627 1986-06-12
SE8602627A SE459328B (en) 1986-06-12 1986-06-12 CUTTING DEVICE

Publications (3)

Publication Number Publication Date
EP0261090A2 true EP0261090A2 (en) 1988-03-23
EP0261090A3 EP0261090A3 (en) 1990-04-25
EP0261090B1 EP0261090B1 (en) 1994-09-28

Family

ID=20364794

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87850188A Expired - Lifetime EP0261090B1 (en) 1986-06-12 1987-06-10 Method and means related to sawing

Country Status (4)

Country Link
EP (1) EP0261090B1 (en)
AT (1) ATE112205T1 (en)
DE (1) DE3750604T2 (en)
SE (1) SE459328B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003051594A1 (en) * 2001-12-19 2003-06-26 Fachhochschule Furtwangen Separating device and method for creating point contacts

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR320788A (en) * 1902-04-30 1902-12-19 Moutheau Felix Reciprocating saw with oscillating blade
DE1453181A1 (en) * 1962-03-28 1969-03-27 Wurster & Dietz Maschinenfabri Frame saw with continuous feed, saw curtain and swing-back frame
FR1561645A (en) * 1967-04-11 1969-03-28

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR320788A (en) * 1902-04-30 1902-12-19 Moutheau Felix Reciprocating saw with oscillating blade
DE1453181A1 (en) * 1962-03-28 1969-03-27 Wurster & Dietz Maschinenfabri Frame saw with continuous feed, saw curtain and swing-back frame
FR1561645A (en) * 1967-04-11 1969-03-28

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003051594A1 (en) * 2001-12-19 2003-06-26 Fachhochschule Furtwangen Separating device and method for creating point contacts

Also Published As

Publication number Publication date
DE3750604T2 (en) 1995-05-18
SE8602627L (en) 1987-12-13
EP0261090A3 (en) 1990-04-25
DE3750604D1 (en) 1994-11-03
EP0261090B1 (en) 1994-09-28
SE8602627D0 (en) 1986-06-12
ATE112205T1 (en) 1994-10-15
SE459328B (en) 1989-06-26

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