EP0885096A1 - Guide d'outil de coupe pour machine a scier - Google Patents

Guide d'outil de coupe pour machine a scier

Info

Publication number
EP0885096A1
EP0885096A1 EP97906201A EP97906201A EP0885096A1 EP 0885096 A1 EP0885096 A1 EP 0885096A1 EP 97906201 A EP97906201 A EP 97906201A EP 97906201 A EP97906201 A EP 97906201A EP 0885096 A1 EP0885096 A1 EP 0885096A1
Authority
EP
European Patent Office
Prior art keywords
cutter
tool bit
guide
lubricant
guide surface
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.)
Withdrawn
Application number
EP97906201A
Other languages
German (de)
English (en)
Inventor
Martti Malin
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.)
Heinolan Sahakoneet Oy
Original Assignee
Heinolan Sahakoneet 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 Heinolan Sahakoneet Oy filed Critical Heinolan Sahakoneet Oy
Publication of EP0885096A1 publication Critical patent/EP0885096A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D55/00—Sawing machines or sawing devices working with strap saw blades, characterised only by constructional features of particular parts
    • B23D55/08—Sawing machines or sawing devices working with strap saw blades, characterised only by constructional features of particular parts of devices for guiding or feeding strap saw blades
    • B23D55/082—Devices for guiding strap saw blades
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D59/00—Accessories specially designed for sawing machines or sawing devices
    • B23D59/04—Devices for lubricating or cooling straight or strap saw blades

Definitions

  • the invention relates to the cutter guide of a sawing machine, especially a bandsaw, as defined in the preamble of claim 1.
  • a bandsaw is a sawing machine that comprises an endless cutter passing over saw discs and controlled by means of a cutter guide disposed above and underneath the cutting point.
  • the task of the cutter guide of a sawing machine is to steer the cutter and to maintain it in the correct sawing position.
  • the tool bits of the cutter guide require service, such as cleaning and lubrication.
  • the tool bits are lubricated by spraying a mixture of water and emulsifier, especially oil, such as rapeseed oil, through a nozzle.
  • emulsifier especially oil, such as rapeseed oil
  • the lubricant tank is usually located far from the sawing machine, often requiring a piping tens of metres long.
  • a lubricant containing water and the emulsifier above tends to become rancid, i.e. to grow bacteries which precipitate the lubricant.
  • Precipitated lubricant interferes with the lubricant supply.
  • each nozzle is equipped with a screen to prevent the lubricant from proceeding, because solid matter will readily clog the small nozzle outlet, thus preventing the lubricant from reaching the object. Clogging is particularly frequent after shutdowns of the sawing machine. Under these circumstances, pipes, nozzles and particularly screens require relatively frequent cleaning; otherwise there is a risk of a costly shutdown of the sawing machine during its operation.
  • a further problem of current cutter guides is that they accumulate sawdust. Sawdust accumulates especially on top of the cutter guide, thus preventing the lubricant jet from the nozzle from reaching the cutter and the cutter guide. Short of lubricant, both the cutter and the cutter guide will be heated and wear rapidly in use, also requiring frequent service and replacements.
  • the purpose of the present invention is to provide a new cutter guide allowing the drawbacks above to be substantially eliminated.
  • the invention is characterised by the features set out in the characterising clause of the independent claim.
  • the cutter guide of a sawing machine, especially a bandsaw, in accordance with the invention includes a tool bit, with associated fasteners and positioning means.
  • the tool bits contain a duct system, through which lubricant is supplied to the moving cutter.
  • the duct system includes a connecting duct and a set of nozzle ducts disposed to open to the guide surface of the cutter.
  • the invention has the advantage of reducing service required for the cutter guide.
  • This cutter guide no longer requires the use of actual nozzles, and hence not of screens with a clogging tendency.
  • the amount of actual lubricant used with water may be reduced; water as such will be sufficient lubricant during the sawing operation.
  • a particularly advantageous feature is that a thin layer of lubricant, especially water, will form during sawing between the moving cutter and the cutter guide, particularly its guide surface, and this thin layer will remain on the cutter even when it rotates over the saw discs until the following sawing cycle.
  • the invention has the further advantage of efficiently preventing sawdust from accumulating on the cutter guide, owing to the fact that the nozzle ducts open to the guide surface of the cutter guide.
  • sawings accumulate are that they absorb lubricant and subsequently adhere to the cutter guide and to other sawing machine components in the vicinity of the cutter and the cutter guide.
  • a still further advantage of the invention is that the cutter and the cutter guide are easy to clean by introducing water under high pressure into the duct system of the tool bit and further to the moving cutter.
  • the invention also has the advantage of improving the sawing result of frozen timber with the use of the cutter guides in accordance with the invention.
  • the amount of water supplied through the duct system of the tool bit is adjustable, allowing sawdust to be more efficiently removed from the saw notch. This results in a good saw cut and a product of better quality than those obtained with sawing machines provided with conventional cutter guides.
  • Still one advantage of the invention is that the actual feeding of lubricant and/or emulsifier can be performed locally. This implies that a separate lubricant supply, such as an emulsion cartridge or the like, can be provided for each cutter guide in accordance with the invention, from where lubricant is periodically supplied to the cutter guide and the saw cutter whenever necessary. It should be noted that, in this way, the lubricant will admix with water only in the cutter guide or in the immediate vicinity of this. This arrangement completely avoids the previously frequent serious inconvenience of bactery deposits in the mixture of water and emulsifier.
  • the invention has the further advantage of the tool bit not being subjected to strong wear to the same extent as the tool bits in conventional cutter guides. This is primarily due to the fact that a thin film of water and/or lubricant, which provides efficient protection against wear for the tool bit, is formed between the tool bit and the moving cutter.
  • the invention also has the advantage of the effective lubricant supply subjecting the cutter to intense cooling, so that the temperature of the cutter does not rise much. The result of this is that pitch from the timber does not stick to the cutter in the same amount as with conventional cutter guides.
  • figure 1 illustrates a bandsaw viewed in the direction of movement of the log
  • figure 2 illustrates the bandsaw of figure 1 laterally viewed
  • figure 3 is a cross-section of the cutter guide in accordance with the invention.
  • figure 4 illustrates the cutter guide of figure 3 viewed from above
  • figure 5 is a longitudinal section A-A (figure 3) of a tool bit of a cutter guide in accordance witii the invention
  • figures 6a to 6e are various possible cross-sectional views B-B (figure 4) of the tool bit of the cutter guide in accordance with the invention; and figure 7 is a front view of the tool bit of a cutter guide in accordance with the invention.
  • Bandsaw 1 is schematically shown in figures 1 and 2.
  • Bandsaw 1 includes two saw discs 2, 3, about which cutter 4, i.e. an endless cutter belt, is arranged to rotate.
  • Saw discs 2, 3 are rotatably fixed to frame 5.
  • Driving equipment 6a is provided in connection with the lower saw disc 3.
  • Clamping equipment 6b for cutter 4 is arranged in connection with the upper saw disc 2.
  • Log T or a similar piece of timber to be sawn is brought in an appropriate position perpendicularly to cutter 4 moved by means of saw discs 2, 3, and an appropriate longitudinal piece is sawn from log T by means of the cutter.
  • cutter guides 7, 8, i.e. upper cutter guide 7 and lower cutter guide 8, are disposed. With the aid of cutter guides 7, 8, cutter 4 is fitted to pass exactly along the desired sawing line at the sawing point, in the correct position.
  • Cutter guides 7, 8 are identical in principle. Such a cutter guide 7, 8 is illustrated in figures 3 and 4.
  • Fasteners 10 include a support 12 and fastening means 10a, 10b, 10c, lOd.
  • Positioning means 1 1, including adjusting nuts 1 la, 1 lc, are used to position tool bit 9 such that the guide surface 14 of the tool bit adopts an adequate position to steer the cutter 4 passing in front of it. Adjustment nuts 1 la, 1 lc are connected to two pin-like guide and stopper means 10a, 10b of fasteners 10.
  • the first fastening means 10c of fastener 10 such as screws, are used to lock tool bit 9 in position on support 12.
  • the second fastening means lOd such as a nut, is used to attach support 12 and tool bit 9 removably to frame 5 of bandsaw 1.
  • Tool bit 9 is provided with a duct system 15, through which lubricant is supplied on the moving cutter 4.
  • the duct system 15 includes a connecting duct 16 and a set of nozzle ducts 17, disposed to open to the guide surface 14 of tool bit 9, as shown for instance in figure 5.
  • Connecting duct 16 in duct system 15 is most preferably a cylindrical bore, disposed to extend from the lateral suface 18 of the tool bit 9 inside the tool bit.
  • Nozzle ducts 17, in turn, extend from the guide surface 14 of the tool bit 9 inside the tool bit, joining connecting duct 16.
  • the cross area of connecting duct 16 is larger than the cross area of each individual nozzle duct 17 in order to ensure efficient lubricant supply from connecting duct 16 to nozzle ducts 17.
  • Connecting duct 16 of duct system 15 is preferably substantially parallel with the guide surface 14 of tool bit 9, in a plane perpendicular to the direction of movement C of cutter 4.
  • Nozzle ducts 17 connect connecting duct 16 through outlets 19 with the guide surface 14 of tool bit 9.
  • Outlets 19 of nozzle ducts 17 are placed at regular intervals a on guide surface 14 of tool bit 9 over the entire width t of the cutter. They are preferably in a plane substantially perpendicular to the direction of movement C of cutter 4, as shown in figures 5 and 7 for instance.
  • a groove 20 is provided on guide surface 14 of tool bit 9, as illustrated in figures 6b-6e. Outlets 19 of nozzle ducts 17 open up in this groove 20. Groove 20 is most preferably perpendicular to the direction of movement C of cutter 4. The length p of groove 20 equals at least nearly the width t of cutter 4.
  • the first end 20a of groove 20 is preferably disposed near the toothed edge 4a of cutter 4; in this way, lubrication and cooling will be directed to the critical zone of cutter 4. Most often, toothed edge 4a extends 2 to 3 mm outwards from edge 9a of tool bit 9, in the lateral direction of this. The first end 20a of groove 20 extends to the vicinity of this edge 9a of the tool bit.
  • the length p of groove 20 and the position of its second end 20b are adapted to the width t of cutter 4 such that the back 4b of cutter 4 barely covers the second end 20b of groove 20, and the straight line assumingly connecting the bottoms of the grooves between the teeth in the toothed edge 4a of cutter 4 and the second end 20b of the groove most preferably face each other.
  • the length p of groove 20 equals the width t of cutter 4, subtracted by some millimetres, e.g. 5 mm.
  • groove 20 of the guide surface 14 of tool bit 9 is bevelled 21, as illustrated in figures 6c, 6d and 6e.
  • This bevelling 21 is disposed at the output edge of groove 20 with regard to the movement of direction C of cutter 4. Bevelling 21 has the advantage that no impurities, such as sawdust, will gather in groove 20 during the sawing operation, but will be rinsed away along with the lubricant.
  • nozzle ducts 17 of duct system 15 are disposed to form a small sharp angle ⁇ downwards from connecting duct 16 towards the guide surface 14 of the tool bit.
  • Lubricant feed duct 22 is arranged to be connected with an appropriate connecting pipe 27 to connecting pipe 16 in duct system 15 projecting from tool bit 9, such as lateral surface 18 of the tool bit.
  • This duct 22 is further most preferably connected to a water source, such as a water distribution system or a water tank 23, as illustrated schematically in figure 4.
  • Feed duct 23 preferably comprises a lateral branch 24, which is most preferably located near tool bit 9.
  • lateral branch 24 is connected directly to connecting duct 16 of tool bit 9.
  • Lateral branch 24 of the feed duct is connected to a lubricant supply source, such as lubricant container 25 or a lubricant network (which several sawing machines may use in common).
  • Lubricant container 25 is most preferably a replaceable, relatively small-sized lubricant cartridge. Lateral branch 24 is also provided with a controllable valve 26. As before, oil, such as vegetal rapeseed oil, is used as a lubricant.
  • tool bit 9 will wear only to a small extent in use.
  • a water film forms, which rotates along with saw discs 2, 3 back to cutter guides 7, 8 (cf. figures 1 and 2). This water film cools cutter 4, it prevents pitch from returning to the surface of cutter 4, and it protects the saw notch against impurities in timber piece T to be sawn.
  • any suitable lubricant may be used periodically by opening valve 26 and introducing lubricant from container 25 into the supply water for cutter guide 7, 8.
  • Lubricant is used when the operation of bandsaw 1 is about to end and/or when saw discs 2, 3 of cutter 4 are to be protected against corrosion.
  • any suitable lubricating substances which protect cutter 4 and saw discs 2, 3 may be used.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sawing (AREA)

Abstract

Cette invention concerne un guide (7, 8) d'outil de coupe destiné à une machine à scier, notamment à une scie à ruban, lequel guide comprend un barreau (9) auquel sont associés des fixations (10) ainsi que des boulons de réglage (11). D'après cette invention, le barreau (9) est équipé d'un système de conduites (15) à travers lesquelles on envoie un lubrifiant vers l'outil de coupe mobile (4). Ce système de conduites (15) comprend une conduite de connexion (16) ainsi qu'un ensemble de conduites à buses (17) s'ouvrant sur la surface de guidage (14) du barreau (9).
EP97906201A 1996-03-06 1997-03-05 Guide d'outil de coupe pour machine a scier Withdrawn EP0885096A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI961041A FI100866B (fi) 1996-03-06 1996-03-06 Sahakoneen teräohjain
FI961041 1996-03-06
PCT/FI1997/000145 WO1997032698A1 (fr) 1996-03-06 1997-03-05 Guide d'outil de coupe pour machine a scier

Publications (1)

Publication Number Publication Date
EP0885096A1 true EP0885096A1 (fr) 1998-12-23

Family

ID=8545595

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97906201A Withdrawn EP0885096A1 (fr) 1996-03-06 1997-03-05 Guide d'outil de coupe pour machine a scier

Country Status (4)

Country Link
EP (1) EP0885096A1 (fr)
AU (1) AU2097297A (fr)
FI (1) FI100866B (fr)
WO (1) WO1997032698A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102514035A (zh) * 2011-12-30 2012-06-27 西南铝业（集团）有限责任公司 一种分切机润滑清洗装置

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3674065A (en) * 1970-07-06 1972-07-04 Weyerhaeuser Co Saw guides
DE3036406A1 (de) * 1980-09-26 1982-05-13 Peter Ing.(grad.) 8221 Stein Herkt Bandsaege, insbesondere fuer kirstalline oder kristallaehnliche materialien, mit einem um umlaufrollen umlaufenden endlosen saegeband

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9732698A1 *

Also Published As

Publication number Publication date
FI100866B (fi) 1998-03-13
FI961041A0 (fi) 1996-03-06
FI961041A (fi) 1997-09-07
WO1997032698A1 (fr) 1997-09-12
AU2097297A (en) 1997-09-22

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