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
  • 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
  • B27B31/00—Arrangements for conveying, loading, turning, adjusting, or discharging the log or timber, specially designed for saw mills or sawing machines
  • B27B31/08—Discharging equipment

Definitions

• the present invention relates to a method of advancing separately at least two mutually adjacent boards cut simultaneously from a log or a block in a sawing ma ⁇ chine to downstream board treating equipment, said boards being held pressed against the remainder of the log or block until the boards have been completely cut from said log or block.
• the invention also relates to an arrangement for use when carrying out the method.
• the main object of the present invention is to achieve effective separation of the boards without the need for board separating knives or barrier devices, so as to enable the edging mill to be operated unmanned.
• This object can be achieved in accordance with the present invention by means of a method of the kind defined in the first paragraph of this specification which is characterized by, subsequent to having cut or sawn the boards from said log or said block, moving each outermost board away from the log or the block with the aid of a respective gripping device which coacts with said outermost board in a manner to release the board lying inwardly thereof and then releasing the outermost board from its gripping device.
• each inner board is allowed to fall down onto a board conveyor while the outermost board is held by its gripping device and the outermost board is then placed on the same conveyor by said gripping device at a slightly later point in time.
• the inner board may be allowed to fall down onto a supporting surface in one position and the outermost board released from said gripping device in another position.
• board is meant in the description and Claims of this specification any piece of wood that is cut from a log or like workpiece, irrespective of the dimensions and length of said log.
• the reference numeral 3 identifies a log from which two boards 1, 2 are cut from both sides of the log with the aid of a saw (not shown) , for instance a bandsaw or circular saw.
• a saw for instance a bandsaw or circular saw.
• the log 3 is transported past the saw, the log is supported on a conveyor chain 5 and is urged against the chain by means of an overlying wheel or runner 6. Since both the saw and the log feeding arrangement may both be of conventional design, they will not be illustrated or described in detail here.
• the boards 1 and 2 cut from the log 3 are held firmly against the remainder of said log by the means of a board pressing device which, in the case of the il- lustrated embodiment, comprises mutually opposing rollers 4, journal means 9 and drive motors 10, which may comprise series-connected hydraulic motors for instance, so that only one drive source is required.
• a board pressing device which, in the case of the il- lustrated embodiment, comprises mutually opposing rollers 4, journal means 9 and drive motors 10, which may comprise series-connected hydraulic motors for instance, so that only one drive source is required.
• rollers When sawing full-length logs, four pairs of rollers are normally required along the length of the log, said rollers being moveable towards and away from the log in a manner known per se.
• the arrangement also includes two mutually opposing gripping devices 7 which coact with the outermost boards 1 cut from opposing sides of the log.
• the gripping de ⁇ vices 7 are carried by a parallelogram guide means 11, one leg of which is comprised of a hydraulic piston- cylinder device 12.
• movement of the gripping devices 7 towards and away from the log is guided by means of a hydraulic piston-cylinder device 14 carried by a schematically illustrated stand 13.
• the arrangement will preferably include at least three, normally four pairs of gripping devices 7, disposed along the length of the log 3.
• the gripping devices are suspended in pairs from rails 15, so as to permit a given degree of movement together with the log in the direction of its long axis.
• the arrangement further includes a conveyor 8 which is provided with dogging devices 17 and which is able to deliver boards to a conveyor 18 located outside said arrangement.
• the conveyor 18 functions to convey logs against hooked stops 19 which are used to keep the boards separated from one another, so as to enable the boards to be advanced individually to a downstream edging mill.
• Figure 1 shows the arrangement during the actual log sawing operation, in which two boards 1, 2 are cut from opposite sides of the log 3. The boards are held firmly to the log with the aid of the roller-pairs 4. The outermost boards that were cut from the log in a preceding sawing operation are referenced 20 and are shown in abutment with the outermost hooked devices 19 for advancement to a downstream edging mill.
• each gripping device 7 is provided with suction cups which grip the outer boards. While the necessary vacuum in the suction cups is being established, the gripping devices 7 can be caused to accompany movement of the log through a short distance, by moving the suspension devices along the longitudinally extending rails 15.
• the gripping devices 7 are moved away from the log 3, see Figure 3, and the innermost boards 2 fall down onto the conveyor 8 while guided by a respective board deflecting plate 21, with the outermost boards 1 still held firmly by the gripping devices 7.
• the hydraulic piston-cylinder device 12 is then ac ⁇ tivated to swing respective gripping devices 7 down towards the conveyor 8 and to deliver the boards 1 onto said conveyor, with said boards separated from the innermost board 2, see Figure 4.
• the hooks 19, which are located in the vicinity of the outer conveyor 18 (see Figure 1) are controlled so that only one board at a time is advanced in a correct infeed position, in contact with the outer hooked device 19 for feeding the board into a downstream edging mill. It will be noted that as a result of the board deflecting plate 21 and downward swinging of the gripping devices 7 towards the conveyor 8, both boards 1, 2 will be positioned right-way-up, i.e. with the wane edge of the boards facing upwards on the conveyor 8. This positioning of the boards upstream of the following board-edging processing is highly advantag- eous and eliminates the necessity of turning certain boards manually.
• the gripping devices 17 may be constructed to deliver the outerboards 1 held thereby in a position which differs from the positions in which the inner boards 2 fall down onto the conveyor 8, as an alternative to the aforedescribed method of delivering said boards on said conveyor, thereby to immediately achieve appropriate spacing between the boards without employing a time delay to deliver the boards on one and the same conveyor, as in the former case.

Landscapes

• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Wood Science & Technology (AREA)
• Forests & Forestry (AREA)
• Sawing (AREA)
• Specific Conveyance Elements (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=20382457

Family Applications (1)

Country Status (2)

Cited By (3)

Citations (3)

• 1991
  • 1991-04-12 SE SE9101115A patent/SE467728B/sv not_active IP Right Cessation
• 1992
  • 1992-04-09 WO PCT/SE1992/000233 patent/WO1992018301A1/en active Application Filing

Patent Citations (3)

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