EP1177078B1 - Vorrichtung zum verschieben von holzwerkstücken - Google Patents

Vorrichtung zum verschieben von holzwerkstücken Download PDF

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Publication number
EP1177078B1
EP1177078B1 EP00908148A EP00908148A EP1177078B1 EP 1177078 B1 EP1177078 B1 EP 1177078B1 EP 00908148 A EP00908148 A EP 00908148A EP 00908148 A EP00908148 A EP 00908148A EP 1177078 B1 EP1177078 B1 EP 1177078B1
Authority
EP
European Patent Office
Prior art keywords
timber
abutment
pieces
cross conveyor
timber pieces
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
EP00908148A
Other languages
English (en)
French (fr)
Other versions
EP1177078A1 (de
Inventor
Jan Johansson
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.)
Renholmens Mekaniska Verkstad AB
Original Assignee
Renholmens Mekaniska Verkstad AB
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 Renholmens Mekaniska Verkstad AB filed Critical Renholmens Mekaniska Verkstad AB
Publication of EP1177078A1 publication Critical patent/EP1177078A1/de
Application granted granted Critical
Publication of EP1177078B1 publication Critical patent/EP1177078B1/de
Anticipated expiration legal-status Critical
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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
    • B27B31/06—Adjusting equipment, e.g. using optical projection
    • 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
    • B27B25/00—Feeding devices for timber in saw mills or sawing machines; Feeding devices for trees
    • B27B25/04—Feeding devices for timber in saw mills or sawing machines; Feeding devices for trees with feed chains or belts

Definitions

  • the present invention relates to an arrangement for moving pieces of timber in the direction of their longitudinal axes in order to adjust the positions of said pieces.
  • Pieces of timber are aligned in a sawmill by moving or displacing the timber pieces in the direction of their longitudinal axes, so as to bring one end or the other of a piece of timber into alignment with an anvil abutment surface or with cross-cutting saws.
  • the timber concerned consists of boards or planks.
  • Boards, or planks pass through a root-sorting procedure in which the butt-end or thick-end of the board is cut away, and also through a top-sorting procedure in which the top-end of the timber is cut away to remove faults in the timber and to enhance its quality, and also to cut the timber to a length that corresponds to given module measurements, etc.
  • the timber is moved in the direction of its longitudinal axis into contact with a fixed stop fender, whereafter the timber is moved into contact with a fixed saw blade without further movement in its longitudinal direction.
  • the timber is moved into contact with one of several raisable stop fenders and then into contact with a fixed saw blade, so as to enable the timber to be cut to different lengths.
  • the timber is first moved into contact with a fixed stop fender, whereafter one of several mutually adjacent saw blades, a so-called trimmer, is activated and the timber cut into different lengths.
  • the root sorter usually moves the timber longitudinally by manually pulling the timber into a correct cutting position relative to a fixed saw blade.
  • the present invention is not restricted to displacing timber in the direction of its longitudinal axis for any particular reason, but can be applied in all instances where it is necessary to displace timber longitudinally.
  • the invention finds particular application where timber shall be displaced longitudinally with great precision and where it shall be possible to displace the timber through any desired distance.
  • Swedish Patent Specification 7908652-6 teaches an arrangement in which timber can be moved longitudinally through any desired distance, i.e. an arrangement in which longitudinal alignment of the timber is continuously variable.
  • the arrangement taught by this patent specification includes a number of fixed abutments that define an angle with the cross-conveyor that conveys the timber transversely to its longitudinal axis. As the pieces of timber are conveyed in their cross-direction on the cross-conveyor, they are displaced in the direction of their longitudinal axes by virtue of one end surface of respective timber pieces sliding against the abutments. According to this prior patent publication, the abutments can be swung out of the path of the timber that has been moved longitudinally by said abutments.
  • Swedish Patent Specification 9201379-6 teaches an arrangement for moving timber in the direction of its longitudinal axis when adjusting the position of the timber.
  • This known arrangement includes a cross-conveyor that is provided with dogging elements and that functions to transport timber in its cross-direction, and further includes abutments which abut one end surface of the timber and therewith move the timber in the direction of its longitudinal axis as the timber is conveyed by means of the cross-conveyor.
  • the abutments are driven synchronously with the cross-conveyor along an endless path which is located in a vertical plane and which defines an angle with the conveying direction of the cross-conveyor.
  • Each abutment moves in front of a respective dogging element of the conveyor along the upper part of said path, and each abutment can be lifted at any position along said path to a position in which the abutment is no longer in contact with the end surface of the timber, so that the piece of timber concerned is no longer moved axially.
  • Fig. 1 is a plan view of an inventive arrangement and also shows schematically a timber cross-conveyor
  • Fig. 2 illustrates the inventive arrangement in larger scale
  • Fig. 3 illustrates a displacing device of the arrangement in Fig. 2
  • Fig. 4 is an end view of the arrangement shown in Fig. 1.
  • Fig. 1 thus shows an arrangement for moving timber longitudinally in order to adjust the position of the timber.
  • the arrangement includes a known cross-conveyor 1 provided with dogging elements and functioning to convey pieces of timber 2 in their cross-direction.
  • the cross-conveyor conveys the timber from above and downwards in the figure, horizontally in practice.
  • the cross-conveyor 1 includes mutually parallel chains that carry the dogging elements 3.
  • an endless path 4 Arranged parallel with part of the cross-conveyor 1 is an endless path 4 which is located in a vertical plane and formed by a chain conveyor that is driven synchronously with the cross-conveyor.
  • the endless path 4 carries a number of displacing devices 5, for instance pneumatic cylinders, which are disposed transversely to the longitudinal direction of the endless path, and therewith parallel with the pieces of timber on the cross-conveyor.
  • the displacing devices 5 are mounted on the endless path 4 at the same distance apart as the spacing between the dogging elements 3 on the cross-conveyor 1.
  • the end of respective displacing devices 5 that lies proximal to the cross-conveyor 1 is provided with abutments 6 with which one end of the timber pieces 2 is intended to abut.
  • the endless path 4 is driven synchronously with the cross-conveyor 1 such that the abutments 6 will lie immediately in front of the dogging elements 3 as seen in the conveying direction, so as to enable a piece of timber 2 to be fed forwards on the cross-conveyor in abutment with the dogging elements 3 and lie with at least a part of its end surface opposite to an abutment 6 on the endless path 4.
  • the timber displacing devices 5 mounted on the endless path 4, e.g. pneumatic cylinders, can be moved reciprocatingly in the cross direction of the endless path, so as to move the abutments 6 and therewith also the timber pieces 2 in their longitudinal directions.
  • the extent to which the pieces of timber are moved longitudinally is determined by an adjuster or by some automated function that determines how much of each piece of timber shall be cut-off. This determination decides the extent to which the pieces of timber 2 are moved longitudinally by the displacing device 5 and therewith also the abutment 6.
  • the size of the cut on the piece of timber concerned is fed by the adjuster into a computer which then controls the relevant timber displacing device so as to displace said timber to a corresponding extent.
  • the displacing devices 5 cannot be adjusted directly to desired longitudinal positions, but are extendible towards the cross conveyor 1 or withdrawable therefrom.
  • a guide strip 7 which delimits movement of respective devices 5 and abutments 6 towards the cross conveyor extends from the position in which the abutment 6 first comes into line with the pieces of timber 2 on the conveyor 1.
  • the guide strip 7 has roughly the same length as the extension of the endless path 4 and is disposed obliquely relative to the cross conveyor 1, such that said strip will be level with the end-line A at the place where the abutment 6 first comes into line with the timber pieces 2 on the cross conveyor, whereas the other end of the guide strip will be situated closer to the cross conveyor and thus at a greater distance from the endless path 4.
  • the timber displacing device 5 shall be capable of displacing the timber 2 through a given distance.
  • This given axial displacement of the timber is achieved by causing the abutment 6 to be withdrawn by the displacement device in response to a control signal when desired displacement of said timber has been effected, therewith enabling the timber 2 to be advanced by the cross conveyor and its dogging elements without further axial movement of the timber, because the abutment 6 is no longer in abutment with said timber 2 and able to influence the same.
  • the timber can now be advanced by the cross conveyor to a downstream cross-cutting saw and therewith cut to a desired length from one end of the timber piece. Movement of each individual piece of timber in its longitudinal direction can thus be adjusted, by causing the abutment to leave said timber at any chosen position along the endless path.
  • the timber displacing devices 5 may be pneumatic cylinders to which compressed air is delivered in order to bring respective abutments 6 into engagement with adjacent pieces of timber.
  • compressed air is supplied to the pneumatic cylinders of the timber displacing devices when respective timber pieces have passed the beginning of the guide strip 7, wherewith the piston of the pneumatic cylinder is extended until a guide means 8 on its abutment 6 comes into abutment with the guide strip 7.
  • the pneumatic cylinder may include a return spring for restoring the piston of the pneumatic cylinder to its starting position, and therewith also said abutment, i.e. total withdrawal of the abutment.
  • the pneumatic cylinder may include a reversal valve that functions to reverse the direction of the compressed air delivered to said valve, such as to return the piston of said cylinder to its starting position.
  • the displacing device 5 may include an electrically extendible slide which is returned to its starting position with the aid of spring means.
  • a hydraulic piston-cylinder device instead of a pneumatic piston-cylinder device.
  • Fig. 2 illustrates an embodiment of an endless path 4 which is comprised of two mutually parallel chains that carry a number of displacing devices 5 in mutually spaced relationship.
  • the displacing devices 5 are provided with an abutment 6 on one end.
  • a swivel connection 9 is mounted on the endless path 4 by means of which compressed air and electricity can both be delivered to respective displacing devices 5 for manoeuvring and displacing said devices.
  • Fig. 3 illustrates a displacing device 5 and associated abutment 6 mounted on a chain 10.
  • the underside of the abutment 6 carries the guide means 8, which lies against the guide rail 7 when the displacing device 5 has been extended to displace axially a piece of timber that lies against the abutment 6.
  • a carrier 11 for supporting the electrical and compressed-air lines 12 that extend from the swivel connection to respective displacing devices 5 for manoeuvring said devices.
  • Fig. 4 is an end view of the endless path 4, and shows the upper and the lower part of the path with chain 10, sprocket wheel 13, and also shows displacing devices 5 mounted on the chain.
  • the sprocket wheel or chain wheel 13 may conveniently be connected so as to be driven by the same motor as that which drives the cross conveyor 1 and may also be connected by a drive shaft to a driving sprocket wheel of said conveyor, so as to synchronous movement between the cross conveyor and the endless path.
  • the invention enables different sawmills to readily adapt the arrangement to a maximum cut-off length, by changing the angular setting of the guide strip 7 while leaving remaining parts of the apparatus unchanged.
  • the inventive arrangement can be adapted to requirements with respect to precision and speed.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Chain Conveyers (AREA)

Claims (7)

  1. Anordnung zum Verschieben von Holzwerkstücken (2) in der Richtung einer Längsachse, um die Positionen der Werkstücke einzustellen, wobei die Anordnung einen Querförderer (1) aufweist, der mit Mitnehmerelementen (3) ausgestattet ist und der so arbeitet, daß er die Holzwerkstücke in ihrer Querrichtung fördert, wobei die Anordnung auch Anschlagelemente (6) aufweist, die dazu dienen, an einer Endoberfläche entsprechender Holzwerkstücke (2) anzuschlagen und damit die Holzwerkstücke während eines Teils des Transports der Holzwerkstücke mittels des Querförderers (1) in Längsrichtung zu verlagern, wobei die Anschläge (6) synchron mit dem Querförderer (1) längs einer endlosen Bahn (4) angetrieben sind, und wobei jedes Anschlagelement sich vor entsprechenden Mitnehmerelementen (3) auf dem Querförderer (1) längs eines Teils seiner Zuführbahn bewegt, dadurch gekennzeichnet, daß die Anschlagelemente (6) an Verschiebevorrichtungen (5) angebracht sind, die quer zu der endlosen Bahn (4) angeordnet und um die Bahn herum bewegbar sind; und daß die Verschiebevorrichtungen (5) so ausgebildet sind, daß sie die Anschläge (6) quer zu der Bewegung um die Bahn herum und in der Längsrichtung der Holzwerkstücke verschieben, um so auch die Holzwerkstücke (2) in der Richtung ihrer Längsachsen zu bewegen.
  2. Anordnung nach Anspruch 1, gekennzeichnet durch eine schräg angebrachte Führungsleiste (7), die so arbeitet, daß sie die Bewegung der Anschläge (6) durch die Verschiebevorrichtungen (5) in der Längsrichtung der Holzwerkstücke begrenzt, wobei die Führungsleiste (7) so geneigt ist, daß ihr Abstand von der endlosen Bahn (4) zunehmend in der Förderrichtung des Querförderers (1) zunimmt.
  3. Anordnung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Verschiebevorrichtungen (5) ein Führungsmittel (8) zum Anschlag an der Führungsleiste (7) aufweisen, wobei die Verschiebevorrichtungen so arbeiten, daß sie das Anschlagelement (6) und damit das Holzwerkstück (2) an dem Beginn der Führungsleiste (7) verlagern, bis das Führungsmittel (8) in Anlage mit der Führungsleiste (7) kommt, und zwar wenigstens am Beginn der Führungsleiste in der Förderrichtung.
  4. Anordnung nach Anspruch 3, dadurch gekennzeichnet, daß die Verschiebevorrichtungen (5) so ausgebildet sind, daß sie in eine Position zurückgezogen werden, in der das Steuermittel (8) von der Führungsleiste (7) in Abhängigkeit von einem aufgebrachten Steuersignal beabstandet ist; und daß das Holzwerkstück (2) weiter in der Förderrichtung des Querförderers (1) gefördert wird, ohne weitere Verlagerung des Holzwerkstücks in seiner Längsrichtung.
  5. Anordnung nach irgendeinem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Verschiebevorrichtungen (5) die Form von pneumatischen Zylindern haben, die an der endlosen Bahn (4) angebracht sind mit dem gleichen Abstand dazwischen wie derjenige zwischen den Mitnehmerelementen (3) an dem Querförderer (1).
  6. Anordnung nach Anspruch 5, gekennzeichnet durch einen Schwenkverbinder (9), der an der endlosen Bahn (4) angebracht ist und komprimierte Luft und möglicherweise auch elektrischen Strom an alle pneumatischen Zylinder liefert, die an der endlosen Bahn angebracht sind.
  7. Anordnung nach einem der Ansprüche 2 bis 6, dadurch gekennzeichnet, daß die Führungsleiste (7) auf verschiedene Winkel in Beziehung zu dem Querförderer (1) und zu der endlosen Bahn (4) eingestellt werden kann.
EP00908148A 1999-02-15 2000-01-21 Vorrichtung zum verschieben von holzwerkstücken Expired - Lifetime EP1177078B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9900493A SE513601C2 (sv) 1999-02-15 1999-02-15 Anordning för att förskjuta virkesstycken
SE9900493 1999-02-15
PCT/SE2000/000127 WO2000047379A1 (en) 1999-02-15 2000-01-21 Device for displacing timber pieces

Publications (2)

Publication Number Publication Date
EP1177078A1 EP1177078A1 (de) 2002-02-06
EP1177078B1 true EP1177078B1 (de) 2003-11-26

Family

ID=20414467

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00908148A Expired - Lifetime EP1177078B1 (de) 1999-02-15 2000-01-21 Vorrichtung zum verschieben von holzwerkstücken

Country Status (7)

Country Link
EP (1) EP1177078B1 (de)
AT (1) ATE254986T1 (de)
AU (1) AU2952200A (de)
CA (1) CA2362432A1 (de)
DE (1) DE60006800D1 (de)
SE (1) SE513601C2 (de)
WO (1) WO2000047379A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE1850641A1 (sv) * 2018-05-28 2019-11-29 Renholmen Ab Anordning för att förskjuta virkesstycken

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI70815C (fi) * 1978-10-19 1986-10-27 Valmet Oy Foerfarande och anordning foer foerskjutning av virkesstycken
SE506862C2 (sv) * 1992-04-30 1998-02-23 Renholmens Mek Verkstad Ab Anordning för att förskjuta virkesstycken i längdsled

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE1850641A1 (sv) * 2018-05-28 2019-11-29 Renholmen Ab Anordning för att förskjuta virkesstycken

Also Published As

Publication number Publication date
EP1177078A1 (de) 2002-02-06
CA2362432A1 (en) 2000-08-17
WO2000047379A1 (en) 2000-08-17
ATE254986T1 (de) 2003-12-15
SE9900493L (sv) 2000-08-16
DE60006800D1 (de) 2004-01-08
SE513601C2 (sv) 2000-10-09
AU2952200A (en) 2000-08-29
SE9900493D0 (sv) 1999-02-15

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