EP0822879B1 - Systeme d'entrainement de lame de scie - Google Patents

Systeme d'entrainement de lame de scie Download PDF

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Publication number
EP0822879B1
EP0822879B1 EP96910874A EP96910874A EP0822879B1 EP 0822879 B1 EP0822879 B1 EP 0822879B1 EP 96910874 A EP96910874 A EP 96910874A EP 96910874 A EP96910874 A EP 96910874A EP 0822879 B1 EP0822879 B1 EP 0822879B1
Authority
EP
European Patent Office
Prior art keywords
sawblade
drive
point
spline
rotation
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
EP96910874A
Other languages
German (de)
English (en)
Other versions
EP0822879A1 (fr
Inventor
Gary R. Taylor
Paul Wierzba
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.)
Balance Investments Ltd
Original Assignee
Balance Investments Ltd
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 CA 2147899 external-priority patent/CA2147899C/fr
Priority claimed from US08/480,288 external-priority patent/US6035758A/en
Application filed by Balance Investments Ltd filed Critical Balance Investments Ltd
Publication of EP0822879A1 publication Critical patent/EP0822879A1/fr
Application granted granted Critical
Publication of EP0822879B1 publication Critical patent/EP0822879B1/fr
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
    • B27B5/00—Sawing machines working with circular or cylindrical saw blades; Components or equipment therefor
    • B27B5/29—Details; Component parts; Accessories
    • B27B5/30—Details; Component parts; Accessories for mounting or securing saw blades or saw spindles
    • B27B5/32—Devices for securing circular saw blades to the saw spindle
    • 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
    • B23D61/00—Tools for sawing machines or sawing devices; Clamping devices for these tools
    • B23D61/02—Circular saw blades
    • B23D61/025—Details of saw blade body

Definitions

  • This invention relates to a saw blade and a drive system therefore and, more particularly, to a sawblade and its associated drive spline having a specific driving configuration, such as disclosed in e.g. CA-A-1015246.
  • Circular type sawblades for use in cutting cants or lumber are of course known as are their associated drive splines.
  • the drive spline has a series of rounded or convex male drive pieces spaced intermittently and circumferentially around the drive spline. These male drive pieces mate with corresponding concave female recesses in the saw blade.
  • the sawblade is mounted onto the drive spline endwise. It slides over the spline until the desired operating position on the drive spline is reached. Under operating conditions, the sawblade is maintained in its desired position with sawguides which prevent undesirable movement in the sawblade. This keeps the kerf or cutting width created by the blade narrow which is desirable in order not to avoid wood wastage during the sawing operation.
  • a sawblade of circular configuration having an axis of rotation, an outer cutting edge and a plurality of inner driven surfaces defined by a first angular distance between a first radial and a second radial.
  • the first and second radials contact each end of a respective one of the driven surfaces located most closely to the axis of rotation.
  • a second angular distance is defined between a third radial and a fourth radial, with the third and fourth radials contacting each end of the respective one of the driven surfaces located most remotely from the axis of rotation.
  • the angular distance between the first and second radials is greater than the angular distance between the third and fourth radials.
  • a drive spline of circular configuration having an axis of rotation, a plurality of outer drive recesses defined by a first angular distance between first and second radials, and a second angular distance between third and fourth radials.
  • the first and second radials contact each end of a respective one of the drive recesses located most closely to the axis of rotation and the third and fourth radials contact each end of a respective one of the drive recesses located most remotely from the axis of rotation.
  • the angular distance between the first and second radials is greater than the angular distance between the third and fourth radials.
  • a drive spline of circular configuration having an axis of rotation, with the drive spline having a plurality of drive recesses provided with replaceable drive surfaces along a first angular distance between a first and second radial, said drive surfaces extending axially along the drive spline.
  • a circular sawblade 10 is mounted on a drive spline 11 which, in turn, is mounted on an arbor 12.
  • the arbor 12 is journalled in bearings 13 and a source of turning power for the arbor 12 is provided (not shown) which is then transferred to the sawblade 10 to turn the sawblade 10 and cut the wood diagrammatically illustrated at 14.
  • a pair of sawguides 20 are mounted on either side of the circular sawblade 10. They guide the sawblade 10 and can move it axially on the drive spline 11. It will be appreciated, of course, that a plurality of sawblades could be mounted on the drive spline 11 depending on the lumber which is being cut and the desires of the operator.
  • FIG. 2 illustrates the sawblade 10 mounted on the drive spline 11.
  • the drive spline 11 and the sawblade 10 have a common axis of rotation 21 and, under operation, the sawblade 10 rotates clockwise as seen by the arrows.
  • a series of inner driven surfaces 22 of the sawblade 10 are complementary to outer drive recesses 23 of the drive spline 11.
  • the radially innermost distance 24 of the drive surface 22 is greater that the radially outermost distance 25 so that if the sawblade contacts a foreign object such as a spike in a tree being cut, the blade 10 will not be hurled from the drive spline 11, but will be retained by the drive spline 11 such that the operator may immediately terminate operation of the drive system.
  • the outside circumference of the drive spline is indicated by a first diameter d io and the inside diameter of the drive spline is indicated by a second diameter d 2i .
  • the distance between d io and d 2i is the distance between the outer diameter of the drive spline 11 and the radially inwardmost distance of the drive recess 23.
  • First and second radials r 1 , r 2 are drawn from the axis of rotation 21 to touch the ends of the drive recess 23 located radially most closely to the axis 21.
  • Third and fourth radials r 3 , r 4 are drawn from the axis of rotation 21 to touch the ends of the drive recess 23 located radially most remotely from axis 21.
  • the angular distance between r 1 and r 2 will be larger than the distance between r 3 and r 4 as can clearly be seen from Figures 2 and 3.
  • This distance is obtained by drawing radials to each of the ends of the drive recess 23 and measuring the distance of .597 in.
  • a 60 degree angle is cut into the drive spline 23 and a surface is formed 90 degrees to the line defining the distance of .597 in. which meets the 60 degree angle cut. This surface defines the most advanced point of the radial r 1 and the most retarded point of radial r 2 .
  • the drive surfaces 30 take a somewhat partially convex configuration and in Figure 4B, the drive surfaces 32 take on an appearance similar to the drive surfaces 22 of Figures 2 and 3 but extend inwardly a much greater distance. However, it remains the case that the angular distance ⁇ 1 between the radials r 1 , r 2 is less that the angular distance ⁇ 2 between the radials r 3 , r 4 .
  • FIGS 4C and 4D illustrate two further drive configurations according to further aspects of the invention.
  • a drive surface 40, 41 which has an angle ⁇ relative to radial r 3 which is greater than zero degrees.
  • replaceable drive surfaces 34 are located along removable inserts made of hardened steel material 35 extending axially along the spline 11, and being secured to the drive spline with bolts 36.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Sawing (AREA)
  • Power Steering Mechanism (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Scissors And Nippers (AREA)

Claims (3)

  1. Lame de scie (10) de configuration circulaire destinée à être montée sur un arbre (12) ayant une cannelure d'entraínement (11) selon la revendication 3 afin d'effectuer la coupe grâce à la rotation de la lame de scie dans un sens de rotation autour d'un axe de rotation (21), la lame de scie ayant un bord de coupe extérieur et une ouverture centrale destinée à recevoir l'arbre, l'ouverture centrale dans la lame de scie (10) étant délimitée par plusieurs surfaces entraínées intérieures (22) qui sont circonférentiellement espacées autour de l'ouverture centrale pour l'interface opérationnelle avec des surfaces d'entraínement sur l'arbre (12) de telle sorte que la rotation de l'arbre a pour résultat une rotation de la lame de scie, caractérisée en ce que chaque surface de la multiplicité de surfaces entraínées intérieures (22) s'étend entre un premier point et un deuxième point, le deuxième point étant disposé radialement à l'extérieur du premier point, chacune des surfaces entraínées intérieures étant configurée de telle sorte qu'un deuxième rayon (r3) s'étendant à travers le deuxième point est positionné en avant par rapport au sens de rotation d'un premier rayon (r1) s'étend à travers le premier point de façon à effectuer la retenue de la lame de scie par la cannelure d'entraínement, spécialement avec des charges de choc.
  2. Lame de scie selon la revendication 1, dans laquelle ladite lame de scie est pourvue de plusieurs saillies et chacune des surfaces entraínées intérieures forme une partie d'une des saillies.
  3. Cannelure d'entraínement (11) destinée à engager une lame de scie (10) selon la revendication 1 ou 2 afin d'entraíner en rotation la lame de scie dans un sens de rotation autour d'un axe de rotation (21) de façon à effectuer la coupe grâce à la lame de scie, la cannelure d'entraínement ayant une surface périphérique extérieure pourvue de plusieurs surfaces d'entraínement (23) pouvant être engagées avec des surfaces entraínées (22) sur la lame de scie de façon à transmettre un mouvement de rotation à la lame de scie pendant la rotation de la cannelure d'entraínement, caractérisée en ce que chaque surface de la multiplicité de surfaces d'entraínement s'étend entre un premier point et un deuxième point, le deuxième point étant disposé radialement à l'extérieur du premier point, chacune des surfaces entraínées intérieures étant configurée de telle sorte qu'un deuxième rayon s'étendant à travers le deuxième point est positionné en avant par rapport au sens de rotation d'un premier rayon s'étendant à travers le premier point de façon à effectuer la retenue de la lame de scie par la cannelure d'entraínement, spécialement avec des charges de choc.
EP96910874A 1995-04-26 1996-04-26 Systeme d'entrainement de lame de scie Expired - Lifetime EP0822879B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
CA 2147899 CA2147899C (fr) 1995-04-26 1995-04-26 Systeme d'entrainement de lame de scie
CA2147899 1995-04-26
US08/480,288 US6035758A (en) 1995-06-07 1995-06-07 Saw blade drive system
US480288 1995-06-07
PCT/CA1996/000266 WO1996033835A1 (fr) 1995-04-26 1996-04-26 Systeme d'entrainement de lame de scie

Publications (2)

Publication Number Publication Date
EP0822879A1 EP0822879A1 (fr) 1998-02-11
EP0822879B1 true EP0822879B1 (fr) 2002-01-09

Family

ID=25677922

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96910874A Expired - Lifetime EP0822879B1 (fr) 1995-04-26 1996-04-26 Systeme d'entrainement de lame de scie

Country Status (6)

Country Link
EP (1) EP0822879B1 (fr)
AT (1) ATE211666T1 (fr)
AU (1) AU706706B2 (fr)
DE (1) DE69618452D1 (fr)
NZ (1) NZ305825A (fr)
WO (1) WO1996033835A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6321627B1 (en) * 1995-06-07 2001-11-27 Balance Investments Ltd. Sawing apparatus

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE199811C (fr) *
US1357030A (en) * 1919-07-23 1920-10-26 Alfred M Currier Circular saw
US3703915A (en) * 1970-08-14 1972-11-28 Portland Iron Works Thin kerf saw machinery
CA1015246A (en) * 1975-05-27 1977-08-09 Marc A. Allard Circular saw mechanism

Also Published As

Publication number Publication date
AU5394396A (en) 1996-11-18
NZ305825A (en) 1998-04-27
ATE211666T1 (de) 2002-01-15
WO1996033835A1 (fr) 1996-10-31
DE69618452D1 (de) 2002-02-14
EP0822879A1 (fr) 1998-02-11
AU706706B2 (en) 1999-06-24

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