WO2018190731A1 - Appareil de scierie mobile - Google Patents

Appareil de scierie mobile Download PDF

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Publication number
WO2018190731A1
WO2018190731A1 PCT/NZ2018/050051 NZ2018050051W WO2018190731A1 WO 2018190731 A1 WO2018190731 A1 WO 2018190731A1 NZ 2018050051 W NZ2018050051 W NZ 2018050051W WO 2018190731 A1 WO2018190731 A1 WO 2018190731A1
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WO
WIPO (PCT)
Prior art keywords
log
mill apparatus
deck
saw mill
mobile saw
Prior art date
Application number
PCT/NZ2018/050051
Other languages
English (en)
Inventor
Karl Jacob Peterson
Original Assignee
Karl Jacob Peterson
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 Karl Jacob Peterson filed Critical Karl Jacob Peterson
Publication of WO2018190731A1 publication Critical patent/WO2018190731A1/fr

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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
    • B27B31/00—Arrangements for conveying, loading, turning, adjusting, or discharging the log or timber, specially designed for saw mills or sawing machines
    • B27B31/04—Turning equipment
    • 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
    • B27B1/007—Methods for subdividing trunks or logs essentially involving sawing taking into account geometric properties of the trunks or logs to be sawn, e.g. curvature
    • 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
    • B27B7/00—Sawing machines working with circular saw blades, specially designed for length sawing of trunks

Definitions

  • This invention relates to a mobile saw mill apparatus arranged to allow for automated rotation of a log during milling operations.
  • Mobile saw mills have the potential to provide advantages in forestry environments, particularly when it may be difficult and costly to remove fallen trees to a remote saw mill installation. These types of mills can also be used to advantage where the desired end product lumbar is to be used in close proximity to the forest location.
  • Mobile saw mills therefore require a log to be locked in place securely to a log deck, and this requirement places some restrictions on the form of cuts which can be made to the log. It is common for prior art mobile saw mills to only allow forthrough and through sawing of logs - where incremental cuts are made and actuated at the top, working down level by level to the bottom left over slab.
  • the through and through method means the actual shape of the log will distort as the cuts are made. Every log has growth tension, some more than others.
  • the timber yielded from the log will not be of an accurate standard. Quite often the timber is significantly bowed. A way around this in part may be to re-skim the faces regularly before the dimensioned timber is removed, however this is only an attempt to prevent the problem.
  • a mobile saw mill apparatus which includes
  • a log deck configured to receive and locate a log to be milled
  • each lift assembly being operable to adjust the relative position of at least one of the rotatable log spikes to a log received by the log deck
  • At least one drive assembly engaged with one or more rotatable mounting spike, said drive assembly or assemblies being operable to rotate a
  • a programmable controller connected to said at least one drive assembly and being configured to issue control signals to said drive assembly or assemblies which control the degree to which a mounting spike and engaged log are rotated.
  • a mobile saw mill apparatus substantially as described above which includes a saw blade movable along the length of the log deck wherein the saw blade is configured to reciprocate along the length of the deck to make a plurality of cuts in a log engaged and held in a locked position by the rotatable mounting spikes.
  • a mobile saw mill apparatus substantially as described above wherein the saw blade is formed by a rotatable disc blade.
  • a mobile saw mill apparatus substantially as described above wherein the saw blade is formed by a swing blade capable of adjusting the orientation of the plane of the blade relative to the longitudinal axis of a log engaged by the rotatable mounting spikes.
  • a computer program product for milling a log using a mobile saw mill apparatus the computer program product being stored on a non-transitory tangible computer readable medium and including instructions that when executed cause a programmable controller to:
  • ⁇ issue at least one of a sequence of operational control signals to a drive assembly of a mobile saw mill apparatus to effect rotation of a log in accordance with the cut plan after each transit of a saw along substantially the length of the log deck of the mobile saw mill apparatus.
  • the present invention is arranged to provide a mobile saw mill apparatus which incorporates a log deck.
  • This log deck provides a support system to bear the weight of a log to be milled.
  • a log deck may be formed by a framework of beams which exhibit a self-centring characteristic.
  • the log deck may define a central depression and utilise a gravity fed operation to allow a log to settle into this central depression.
  • a central log centring depression may be formed in a log bed through the provision of at least one log centring support. Such a support may be deployed between two or more log centring support.
  • a log centring support may have a substantially ⁇ ⁇ or "V" shaped form to provide the central depression used to centre centrally position logs loaded on to the log deck.
  • a log centring support may have a movable connection to longitudinally orientated elements of the log deck, allowing this component to be positioned at various points along the length of the log deck.
  • two or potentially more log centring supports may be provided in the construction of a log deck with this variable connection characteristic allowing the supports to be positioned
  • a log deck may also incorporate two transverse end beams, each beam being supported by at least two height adjustable feet. These end beams can support loads applied to the intervening components of the log deck.
  • the invention may also co-operate with one or more centrally located levelling jacks.
  • a levelling jack or jacks may be provided as a standalone separate component to the log deck and may be positioned underneath various regions of the log deck to support the weight of a log loaded onto the deck and accounting for sag correction.
  • a levelling jack may be provided by a hydraulic jack assembly which can be raised to a desired height underneath the log deck to contact the underside of a log and assist in supporting the weight of the log.
  • the invention includes at least two rotatable mounting spikes deployed at opposite ends of the log deck. These spikes are configured to engage with a log by piercing the ends of the log.
  • a hydraulic cylinder drive which can be employed to force each spike into the end of a log, and also withdraw the spike from the remnants of the log after milling operations have concluded.
  • the invention may include at least one log end measurement system.
  • a log end measurement system may be deployed at one or potentially both ends of the log deck to provide an indication of the minimum diameter of a log supported by the deck.
  • a log end measurement system may also be used to identify the centre of the log on the end of the log.
  • the invention may incorporate a single log end measurement system implemented by a laser rangefinder. These optical devices can be used to remotely identify the minimum or smallest width of a log. Those skilled in the art will however appreciate that other types of log end measurement systems may also be utilised in conjunction with the present invention and reference to the provision of a single laser rangefinder at one end of the log deck should in no way be seen as limiting.
  • the mobile saw mill apparatus may be provided with or in conjunction with a saw blade. This saw blade may be moved along the length of the log deck to complete milling operations, with the saw blade reciprocating back and forth along the deck to mill various lumber cuts from a log.
  • a rotatable disc blade may be provided in combination with the invention.
  • a swing blade may be provided as a saw blade in conjunction with the invention. Swing blades are formed from a rotatable disc blade which has the capacity to pivot through a range of angles.
  • a swing blade may be provided with the invention which has the capacity to present the plane of the blade at a substantially horizontal angle to the longitudinal axis of a log, at a
  • the invention may include a saw blade with the plane of the blade orientated substantially perpendicular to the longitudinal axis of a log.
  • the invention may also include a jig, where the jig controls the vertical position of the perpendicular saw blade as it travels along the log deck.
  • the longitudinal travel rate of the perpendicular blade may be set to a consistent value while the blade follows the profile of the jig, allowing for a very complex shape to be spun true from the log.
  • the invention may include a belt sander and jig in combination with, or as an alternative to the saw blade referenced above. Similar drive systems as those used to rotate a saw blade may be employed to rotate the belt of the sander as it traverses the length of the log deck while the log is continuously rotated on the log deck. This arrangement allows for a smooth product finish against complex radial shapes when the log is spun at a certain set speed while the sanding apparatus is set to travel at a longitudinal rate following the jig.
  • Reference in general throughout this specification will also be made to a swing blade being provided in conjunction with the present invention, while those skilled in the art will appreciate that alternatives are also within the scope of same.
  • the invention may also include a camera remote from a display system which can be viewed by an operator.
  • This camera can record or transmit a view of the end of a log which is remote from the operator.
  • the view provided by this camera may be used by an operator to judge the relative positioning of an adjacent rotatable mounting spike and if the mounting spike is ready to move forward and pierce the centre of the log.
  • an identifier of the log centre may be superimposed on the image presented to the operator by the display system.
  • this information may act as a guide to the operator to ensure they correctly position the rotatable mounting spike and that this spike pierces the centre of the log.
  • a mobile saw mill provided in accordance with the invention includes two lift assemblies, each lift assembly being operable to adjust the relative position of at least one of the rotatable log spikes to a log received by the log deck.
  • a mobile saw mill provided in accordance with the present invention may include two lift assemblies, each being connected to one of the inventions rotatable mounting spikes. These lift assemblies can be configured to move the connected mounting spike towards and away from the log deck, preferably moving the spike up and down relative to the log deck. The action of these lift assemblies will therefore facilitate lifting of a log pierced by the mounting spikes off the log deck, allowing free rotation of the mounting spikes and log during milling operations. The same lift assemblies can then be used to return any remnants of a log to the log deck after the completion of milling operations.
  • the lift assemblies provided by the invention may not be connected to the rotatable mounting spikes, nor be used to move a spike towards and away from the log deck.
  • a lift assembly can be used to adjust the relative position of a log spike to a log received by the log deck by lifting or lowering the log relative to the log deck and mounting spike connected to the log deck.
  • each mounting spike be mounted to the log deck at a static height or position, with the log being manoeuvred by the lifting assemblies to locate each mounting spike adjacent to the centre of the log.
  • a lift assembly may incorporate or include a hydraulic lifting cylinder.
  • Pressurised hydraulic fluid may be used to lift a log (or a mounting spike which is engaged with a log) and this fluid may be released from the hydraulic cylinder to lower the same log.
  • hydraulic lifting cylinders may be easily
  • the invention incorporates at least one drive assembly engaged with one or more mounting spikes.
  • a drive assembly can be used to apply a torque or rotational force to one or more mounting spikes to rotate a log engaged by the spike spikes
  • the invention may incorporate a single drive assembly only engaged with a single mounting spike deployed at one end of the log deck.
  • the remaining mounting spike can be described as a follower spike and will therefore rotate freely when its opposite is rotated by the single drive assembly.
  • Reference throughout this specification will also be made to the present invention incorporating a single drive assembly linked to a single mounting spike only. However those skilled in the art appreciate that other arrangements or configurations of the invention are envisioned - such as the provision of two drive assemblies or a drive assembly linked to both mounting spikes.
  • the drive assembly provided by the invention can allow for precise
  • a drive assembly may be formed by an electric motor with an associated transmission system engaged with a mounting spike. Electric motors and their associated transmissions are well known in the art and may be readily configured to perform as a drive assembly.
  • a self-braking electric motor with an integral gearbox may be employed as a drive assembly which serves to hold the log steady while each incremental cut is performed.
  • a mobile saw mill provided by the invention also includes a programmable controller configured to transmit control signals to the drive assembly.
  • This programmable controller allows for precise automatic control of the degree of rotation applied to a log in a single actuation of the drive assembly for a single pass of the saw blade.
  • a range of information technology systems may be employed to implement a programmable controller, such as for example, embedded automated PLC components through to more sophisticated flexible computer systems.
  • programmable controller hardware may be employed by the invention, preferably which can be loaded with a set of executable instructions which facilitate the completion of milling operations.
  • the programmable controller may also receive input signals from a log end measurement system. These signals may be used to determine a log cut plan in some embodiments, as discussed further below. Furthermore this information may also be used to generate a superimposed centre point graphic or image to be presented on an operator observable display system screen which presents an image of the end of the log remote from the operator.
  • the invention may also include an operator interface station.
  • the station can be used to receive commands from an operator to control the behaviour of the apparatus provided.
  • an operator interface station may include manual override controls which allow direct control of the various moving parts of the invention. For example buttons and/or control levers may be provided to provide the operator with the ability to raise or lower a log to desired heights, rotate the log to a desired degree in either a clockwise or anticlockwise direction, and/or rotate a log at a desired speed.
  • Manual controls may also be provided to actuate mounting spikes to pierce the ends of a log or to withdraw the mounting spikes from the remnants of a log after a milling operation.
  • an operator interface station can also be used to interact with the programmable controller and any executable processes being run by this controller.
  • An operator interface station may receive information from the operator which can be used to determine a cut plan, and may - for example - receive an indication from the operator that the saw blade has completed the current pass down the log deck and that the next rotation of the log dictated by a cut plan should be executed.
  • the present invention also encompasses a computer program product for the above-referenced mobile saw mill apparatus, this program facilitating the determination of log cut plans and also the execution of these cut plans. It should be appreciated by those skilled in the art that this program product may consist of a series of computer executable instructions stored in a non- transitory tangible computer readable medium.
  • this computer program may initially receive a minimum long log diameter indication.
  • minimum log diameter information may be obtained automatically in some embodiments from a log end measurement system, or in other embodiments may be provided through information input into an operator interface station. This minimum log diameter identifies the smallest possible width or diameter of a log to be milled.
  • this computer program can also solicit the provision of desired lumber characteristics to be produced by milling the log with the above identified minimum log diameter. These desired lumber characteristics can incorporate the height and width of individual pieces of lumber to be produced by the milling operation. In some further preferred embodiments this computer program may also solicit the provision of additional information from an operator. For example in a number of exemplary embodiments the following milling processes may be executed through the operator providing lumber characteristic
  • Stable quality logs - Quarter sawn In this instance the operator requires a more structural stable timber from the log. The same parameters are entered; minimum diameter, width (now narrow) and depth (now deep). Each board will be removed with its narrowest face centred above and around the heart - effectively recreating the above- mentioned movements.
  • Simple conversion from round to square In this instance the operator simply chooses to convert a round log into a square. The operator simply measures the first cut and the computer rotates 90 degrees for each cut.
  • Lathing a log In this instance the operator simply requires a lathed round log. A series of fine incremental cuts are performed all around the log - bringing the log to bear a relatively round result. The computer is then told to rotate the log at a set speed and the sawblade is brought to contact the tangent of the log. The saw mill is then set at a very slow feed rate will the log is spun true via rotation.
  • This computer program can also be utilised to determine a cut plan based on the received minimum diameter indication and desired lumber
  • the minimum radius of the log to be milled may be derived and divided into a series of concentrically orientated rings, each with a height approximately equal to the height of the desired lumber products.
  • the circumference of each ring can then be divided by a number of cut identifiers spaced apart by distances approximately equal to the width of the desired lumber products while also accounting for kerf intersection and overlap. In this way a large volume of a log may be sawn into lumber products with the desired identified characteristics through sequentially cutting around each concentric ring defined by the cut plan.
  • this computer program may be utilised to control the operation of the apparatus during execution of the cut plan.
  • the software may receive an input - either via an automated system or from the operator - indicating that the associated saw blade is ready to complete a pass along the length of the log deck.
  • the computer program can then command the appropriate degree of rotation to be applied to the log to produce the next cut dictated by the cut plan.
  • the computer program may also provide informational or instructions to an operator of the invention through the display screen of the operator interface station.
  • this information may indicate any changes required in the orientation or configuration of the saw blade to execute the current cut dictated by the cut plan.
  • the present invention may provide many potential advantages over the prior art.
  • the invention relates to the integration and co- operation of:
  • a single saw blade being position able along 3 movable axes in relation to the position of the rotatable log, where the single blade having the ability to rotate between 0-180 degree of rotation. This enables the single blade (reference to longitude movement along the log) the ability to cut both horizontal and vertical orientations while also having the ability to saw angles between.
  • the use of a single swinging blade reveals an extensive combination of advantages regarding further de-stressing and sawing combinations while reducing the log to timber or shapes.
  • a very small circular 'swing-able' blade may be fitted as a method of double-cutting can be utilised producing double width boards all around the periphery of the log.
  • a 6" depth swing blade may achieve 12" wide boards all around the log.
  • ⁇ Weather boards can be achieved by plunging in to the log, sawing
  • Log home beams may be produced via cutting top and bottom faces flat. With regard to the top face the single blade may plunge in at the centre and remove a female square section. On the other face two cuts can be performed on either side leaving a male square at the centre.
  • a horizontal positioned blade may be positioned at the tangent of the log. The log may be spun at a desired speed. The feed system of the circular blade may be actuated at a set speed. This allows the log to be spun true into a circular pole.
  • the turning system can also secure log halves, quarters, and squares at any given end for further milling reduction.
  • Figures la, lb shows an isometric view and side view of a mobile saw mill apparatus provided in accordance with one embodiment of the invention
  • Figure 2 shows a partial side view of one end of a mobile saw mill
  • Figure 3 provides a schematic flowchart of executable instructions run by a computer program used to operate the mobile saw mill apparatus illustrate with respect to figure 1,
  • Figure 4 shows a further embodiment of the invention with a front view illustrating the invention's log rotating system coupled with a swing blade assembly mounted around it,
  • Figure 7 shows the embodiment of the invention illustrated by figures 4-6 where a log ready to be sawn
  • Figure 8 shows the embodiment of the invention illustrated by figures 4-7 where the controller running computer software has identified the first cut starting point
  • Figure 9 shows the embodiment of the invention illustrated by figures 1-5 with the swing blade cutting head now lowered to the desired depth size of board
  • Figure 10 shows the embodiment of figures 4-9 where the swing blade apparatus is sawing free the horizontal cuts.
  • Figure 11 shows the embodiment of figures 4-10 where a consecutive radial drop of 2" after the minimum diameter is provided to the controller with width and depth of board factored,
  • Figure 12 shows the embodiment of the invention illustrated by figures 4-11 which has been used to produce a surfaced pentagon
  • Figure 13 shows the embodiment of the invention illustrated by figures 4-11 which has been used to produce a finished square or rectangular cant
  • Figure 14 shows the embodiment of the invention illustrated by figures 1-11 and illustrates how a small log or the core of a larger log may be lathed into a true round pole
  • Figure 15 shows a further embodiment of the invention which includes a perpendicular saw blade mounted onto the swing blade apparatus
  • Figure 17 shows a comparative example of cut plans which provide radial 'back sawn' boards
  • Figure 18 shows how in some embodiments the invention may be used to produce lumber used to form log home wall structures.
  • Figures la and lb shows a perspective isometric view and side view of a mobile saw mill apparatus 1 as provided in accordance with one possible embodiment of the invention.
  • the apparatus includes a log deck 2 provided to bear the weight of a log to be milled.
  • the log can be rolled by hand or mechanically lifted on to the deck.
  • the log deck 2 defines a central depression which is provided to locate logs in the centre of the deck, self-centring the log in relation to the circular longitude movement.
  • This central depression is provided by a number of log centralising supports 3 which are connected at right angles to two main longitudinal beams 4 to define the deck.
  • Each log centralising support 3 has a U-shaped configuration to provide the centralising depression of the log deck, and the position of each of these supports along the length of the deck can be adjusted as desired using a set of removable connection pins 5.
  • Adjustable feet 6 are provided to elevate the log deck off the ground, with height adjustments being made to accommodate sawdust build up.
  • the log deck may be mounted using series of wheels and suspension resembling a trailer to provide a more portable character.
  • the centre support Prior sawing and after rotation the centre support is jacked up to alleviate log sag.
  • the amount of lift required can be estimated by measuring the circular saw mill beam position from each ends of the log and comparing the relationship at the centre of the system. Alternatively, a string or laser system will also provide for this adjustment.
  • Two rotatable mounting spikes 8 are provided at each opposed end of the log deck to engage with the ends of a log to be milled.
  • the end mounting spike engagement systems are movable with regards to the ends of the log through the provision of a hydraulic cylinder 9 for each spike, these cylinders being used to plunge the spikes into and out of the ends of the log.
  • Two lift assemblies 10 are provided, each connecting a rotatable mounting spike 8 to the log deck by way of a series of removable pins 11. These removable pins provide a movable connection system for the lift assemblies, allowing them to be connected at different regions in the log deck to accommodate different lengths of log.
  • Each lift assembly 10 also includes a hydraulic cylinder 12 engage with the mounting spike and configured to move the mounting spike towards and away from the log deck to raise or lower the end of any log pierced by the mounting spike.
  • This arrangement therefore provides two hydraulic cylinders at either end of the log deck to respectably drive a mounting pin into the end of log, and to lift the end of the log once pierced by a mounting spike.
  • a drive assembly 13 is also provided, formed by an electric self-braking motor with an integral gearbox and transmission system linked to one of the rotatable mounting spikes 8.
  • the drive assembly operates to apply a torque to the rotatable mounting spike to in turn rotate a log by a specific angle, or at a specific rotational speed.
  • the apparatus also includes a programmable controller mounted within an operator interface station 14. The controller embedded within the operators interface station 14 is arranged to execute a software product and is connected to the drive assembly 13 to issue control signals to the drive assembly to control the rotation of the mounting spike.
  • a camera is located at the opposite end of the log deck to the operator interface station 14 and to transmit images of the adjacent end of the log which can't be seen by an operator when using the interface station.
  • These opposite log end images can be presented to the operator by a display system screen integrated into the interface station 14 so the operator may see when a mounting spike is positioned adjacent to the centre of the log.
  • a cross hair is provided on the display to align the log centre to the far end spike which makes contact into the log. This allows complete operation from a remote position.
  • a log end measurement system can also be provided adjacent to such a camera.
  • this system can include a laser range finder adapted to measure the minimum diameter of the log at the end of the log deck, with the login measurement system and arranged to transmit this information to the programmable controller embedded within the user interface station 14.
  • the interface station also provides the following direct operator control features:
  • the mounting spikes are positioned and driven into the centre of the log at either end of the log.
  • the log is then lifted using the lift assemblies so that it clears the components of the log deck when rotated by the drive assembly.
  • Figure 2 shows a partial side view of one end of a mobile saw mill apparatus provided in a further embodiment.
  • the apparatus provided by the invention has a similar configuration to that shown with respect to figure 1 but also includes a camera 15.
  • This camera is mounted adjacent to a rotatable mounting spike 8' located remotely from the operator interface station (not shown).
  • the camera is positioned in this location to include the end of the log and mounting spike in its field of view as shown by the dotted line of sight rays shown in figure 2.
  • the camera is configured to transmit these images of the end of a log supported by the spike and log deck to the display system of the operator interface station.
  • Figure 3 provides a schematic flow chart of instructions executed by a computer program configured to assist in the operation of the mobile saw mill apparatus discussed with respect to figure 1.
  • Stage A executes once the log is loaded on to the log deck, centred, and lifted using the mobile saw mill apparatus illustrate with respect to figure 1.
  • the log end measuring system communicates (A) the minimum diameter of the log to the programmable controller, although in other embodiments this information may be manually measured, entered by a keyboard or similar user interface, and supplied to the controller by way of the operator interface station.
  • the controller then solicits at stage B desired lumber characteristics from the operator in the form of the width and depth of lumber boards to be produced by milling operations. For example in various embodiments these desired lumber characteristics from the operator in the form of the width and depth of lumber boards to be produced by milling operations. For example in various embodiments these desired lumber characteristics from the operator in the form of the width and depth of lumber boards to be produced by milling operations. For example in various embodiments these desired lumber characteristics from the operator in the form of the width and depth of lumber boards to be produced by milling operations. For example in various embodiments these parameters from the operator in the form of the width and depth of lumber boards to be produced by milling operations. For example in various embodiments these desired lumber characteristics from the operator in the form of the width and depth of lumber boards to be produced by milling operations. For example in various embodiments these desired lumber characteristics from the operator in the form of the width and depth of lumber boards to be produced by milling operations. For example in various embodiments these desired lumber characteristics from the operator in the form of the width and depth of lumber boards to be produced by milling operations
  • characteristics can include the width and depth of lumber cuts to be made, this information being keyed in by the operator.
  • the program provided determines a cut plan at stage B.
  • the computer software run by the controller uses the minimum log width information to calculate the effective radius of the log and divides this area of the log into a number of concentric rings deployed around the centre of the log.
  • the received lumber width information determines how many boards can be obtained from each ring, while the depth information determines the number of rings which can be milled from the log.
  • the cut plan is finalised to identify where cuts need to be made, and hence the angle of rotation to be applied to the log after each specific cut.
  • such cut plans can include or indicate the height of the first cut to be made and the rotational angle and number of turns to be completed in accordance with subsequent cuts.
  • stage D Lastly the program run by the controller executes the cut plan at stage D by issuing a sequence of operational control signals to the drive assembly to affect rotation of the log by the specific amounts after each transit of the saw along the length of the log deck.
  • Stage D can execute a further iterative sub-process which initially makes the first horizontal cut, then the log is rotated to its given angle and a second horizontal cut is made. This process repeats for every rotation defined in the cut plan. The blade is then lowered to the original keyed depth, where the original keyed width board is removed from each open face centred to the heart of the log. The sub- process then runs again until the entire cut plan has been executed.
  • Figure 4 shows a further embodiment of the invention with a front view illustrating the invention's log rotating system coupled with a swing blade saw mill milling apparatus mounted around it. It shows a log (a) staged and ready to roll into the system.
  • the swing-blade sawing head (b) is mounted and ready to be positioned to make its cuts.
  • the swing blade is configured to reciprocate along the length of the log deck shown to make a plurality of cuts in a log engaged by a set of rotatable mounting spikes.
  • the sawblade as formed by a rotating disk swing blade.
  • the swing blade can adjust its orientation to change the angle made by the plane of the blade to the longitudinal axis of a log.
  • a log in the shape of a pentagon (c) is shown after some cuts have been made.
  • the control station and display system screen (d) for manipulation of the log is shown just to the right of the turning system.
  • Blocks of timber (e) or the like have been added to prop up components to allow for alignment and work flow.
  • Figure 5 shows an isometric view of the embodiment of figure 4 including the log rotating system coupled with a swing blade saw mounted around it.
  • the swing blade assembly utilises 3 axis of movement to diminish the mounted rotatable log (c).
  • longitudinal feed axis (h) manipulate the cutting head through log (c).
  • the control station is located directly next to the operator position (i).
  • Figure 6 shows an isometric view of parts of the invention shown in the embodiment illustrated by figures 4 and 5 where by the swing blade cutting head has been plunged into the log and sawing a deep horizontal cut (I). At the end of its longitudinal movement it will be plunged out of the cut. The vertical cuts (j) will be rotated and the process repeated all around the log. The ends of the log (k) will then be docked revealing equal sized wedged boards.
  • Figure 7 shows the embodiment of the invention illustrated by figures 4-6 where a log (a) ready to be sawn.
  • the far end sliding (pin-able) connection point (m) is secured to the log.
  • the near end sliding connection point (o) is also secured to the log.
  • the main support deck is supporting (p) the log.
  • Hydraulic cylinder (q) has lifted both ends off the deck.
  • Hydraulic cylinder (r) has pressurised the spikes into the log ready for rotation.
  • Figure 8 shows the embodiment of the invention illustrated by figures 4-7 where the controller running computer software (d) has identified the first cut starting point optimised with regard, to the choice of board size.
  • the swing blade sawmill (b) has now performed a series of horizontal and vertical cuts to remove the external bark region converting the log shape after rotation into a pentagon (number of rotations and angle of rotation advised by the computer). Each top face (s) is sawn flat then rotated all around the log.
  • the front view shows the bottom log support (t) which allows for initial alignment of the log and adjustability to varying sizes of logs.
  • Figure 9 shows the embodiment of the invention illustrated by figures 4-8 with the swing blade cutting head now lowered to the desired depth size of board.
  • the sawing head has been lowered 1" and a series of vertical cuts have been made into the top face.
  • the controller will then rotate to each additional flat face and the process repeated. This vertical first cut process relaxes the log.
  • the tension is displaced equally around the log between the cuts.
  • Figure 10 shows the embodiment of figures 1-6 where the swing blade (b) apparatus is sawing free the horizontal cuts. The single blade may break up the log stress ordinarily experienced with a full depth horizontal cut.
  • the single blade allows the blade to cut it in to two smaller consecutive cuts, the first horizontal 3" cut (v) followed by the following 3" cut (w) to achieve the full 6" wide board. This progressively reduces the stress in the log and the cut. Typically offering a more accurate cut and less strain on the blade.
  • the log is then rotated to every face repeating the process.
  • Figure 11 shows the embodiment of figures 4-10 where a consecutive radial drop of 2" after the minimum diameter is provided to the controller with width and depth of board factored. The external pentagon is then reshaped and the mill is dropped 2".
  • the swing blade (b) apparatus having already edged the vertical cuts and now releasing a double width cut 12" (z).
  • FIG. 12 shows the embodiment of the invention illustrated by figures 4-11 which has been used to produce a surfaced pentagon (aa) ready to be utilised as a structural product.
  • Figure 13 shows the embodiment of the invention illustrated by figures 4-11 which has been used to produce a finished square or rectangular cant (bb) ready to be utilised as a structural product.
  • Squares of almost any size can be made utilising a very small blade in such embodiments.
  • Figure 14 shows the embodiment of the invention illustrated by figures 4-11 and illustrates how a small log or the core of a larger log may be lathed into a true round pole (cc) using the swing blade (b) cutting head.
  • the log is set to rotate permanently via the controller and software (d).
  • the circular blade is then moved so that the edge of the blade is skimming the log at the tangent (dd).
  • the longitudinal feed rate of the cutting head is then set where by the log rotates while skimming into a true round pole.
  • Figure 15 shows a further embodiment of the invention which includes a perpendicular saw blade (hh) mounted onto the swing blade apparatus (b) (ee) illustrated with respect to figures 1-8.
  • This perpendicular saw blade may be pushed or attached to the head saw.
  • the longitudinal feed rate of the saw blade may be set to a consistent value while the end roller follows a jig (ii), allowing for a very complex shape to be spun true from the log (gg).
  • Log rotation speed is set at a certain rate via the controller and the crosscut blade makes its way along the jig against a roller arm (ff), and log (gg).
  • Figure 16 shows the same perpendicular arrangement of the embodiment of figure 15 but fitted with a belt sander (jj) in place of the saw blade. This arrangement allows for a smooth product finish against complex radial shapes.
  • the log is spun at a certain set speed while the sawing apparatus is set at a longitudinal rate following the same jig.
  • Figure 17 shows a comparative example of cut plans which provide radial 'back sawn' boards (kk) centred to the heart and incrementally tilted to a predetermined board width calculated by the software.
  • the cut plan
  • the process implemented by the invention in this embodiment provides straight timber which tends to bow up and down on the flat edge rather than the thin edge (crook).
  • the last board (nn) on its rotation around the centre is compromised in width as this board is also used for the entry cut. After each full rotation, the boards are removed.
  • the swing blade used is lowered by 1" (kk) followed by (oo), (pp), (qq), (rr) and (ss).
  • the last portion remaining is the core which can be utilised for further shaping or left as it is.
  • stressed logs have an undesirable core.
  • the core may still be used, as enough material surrounding the dead core can captivate it, creating a structurally adequate product (tt).
  • Figure 18 shows how in some embodiments the invention may be used to produce lumber used to form log home wall structures.
  • a log may initially be sawn on the top face.
  • the sawblade is then lowered a set amount, a cut is made to the left and then to the right leaving a male protruding section at its centre.
  • the log would then be rotated 180 degrees, and a face removed.
  • the vertical positioned blade can then be lowered to a depth equalling the other side's male feature.
  • a series of vertical cuts actuated side by side reveal an equal width 'female' channel.

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

Abstract

Selon un aspect, l'invention concerne un appareil de scierie mobile qui comprend un pont de rondin configuré pour recevoir et localiser un rondin à broyer. Un rondin est fixé par deux pointes de montage rotatives, dont chacune est associée à une extrémité opposée de la plate-forme de rondin, et deux ensembles de levage reliant chacun une pointe de montage séparée au lit de rondin. Lesdits ensembles de levage fonctionnent pour déplacer les pointes de rondin vers la plateforme de rondin et à l'opposé de cette dernière, et les pointes de rondin peuvent être mises en rotation sous l'action d'au moins un ensemble d'entraînement qui est actionné par un dispositif de commande programmable configuré pour émettre des signaux de commande qui commandent le degré auquel une pointe de montage et un rondin mis en prise sont mis en rotation.
PCT/NZ2018/050051 2017-04-15 2018-04-13 Appareil de scierie mobile WO2018190731A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NZ73107117 2017-04-15
NZ731071 2017-04-15

Publications (1)

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WO2018190731A1 true WO2018190731A1 (fr) 2018-10-18

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT525806A4 (de) * 2022-03-10 2023-08-15 Holzbau Unterrainer Gmbh Holzbearbeitungsvorrichtung mit einem Bearbeitungsportal

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4307641A (en) * 1980-06-25 1981-12-29 Robert Shapleigh Portable sawmill
US4879659A (en) * 1987-11-24 1989-11-07 Bowlin William P Log processing systems
US4895197A (en) * 1987-06-12 1990-01-23 Andersen Erling J Method and apparatus for sawing logs
US5806401A (en) * 1994-01-04 1998-09-15 Rajala; Edward Satellite sawmill with adjustable saws and automatic sawbolt centering device
US20020038587A1 (en) * 2000-09-25 2002-04-04 Yves Rioux Lathe attachment for a portable bandsaw mill

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4307641A (en) * 1980-06-25 1981-12-29 Robert Shapleigh Portable sawmill
US4895197A (en) * 1987-06-12 1990-01-23 Andersen Erling J Method and apparatus for sawing logs
US4879659A (en) * 1987-11-24 1989-11-07 Bowlin William P Log processing systems
US5806401A (en) * 1994-01-04 1998-09-15 Rajala; Edward Satellite sawmill with adjustable saws and automatic sawbolt centering device
US20020038587A1 (en) * 2000-09-25 2002-04-04 Yves Rioux Lathe attachment for a portable bandsaw mill

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT525806A4 (de) * 2022-03-10 2023-08-15 Holzbau Unterrainer Gmbh Holzbearbeitungsvorrichtung mit einem Bearbeitungsportal
AT525806B1 (de) * 2022-03-10 2023-08-15 Holzbau Unterrainer Gmbh Holzbearbeitungsvorrichtung mit einem Bearbeitungsportal
WO2023168470A1 (fr) 2022-03-10 2023-09-14 Holzbau Unterrainer Gmbh Dispositif d'usinage de bois comprenant un portique d'usinage

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