EP0929484B1 - Anlage zum zuführen von baumstämmen zu einer vereinzeleinrichtung - Google Patents

Anlage zum zuführen von baumstämmen zu einer vereinzeleinrichtung Download PDF

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Publication number
EP0929484B1
EP0929484B1 EP97919812A EP97919812A EP0929484B1 EP 0929484 B1 EP0929484 B1 EP 0929484B1 EP 97919812 A EP97919812 A EP 97919812A EP 97919812 A EP97919812 A EP 97919812A EP 0929484 B1 EP0929484 B1 EP 0929484B1
Authority
EP
European Patent Office
Prior art keywords
boards
conveyor
board
feeder
speed
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
EP97919812A
Other languages
English (en)
French (fr)
Other versions
EP0929484A1 (de
Inventor
Erland Marklund
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
Priority claimed from SE9601389A external-priority patent/SE510399C2/sv
Priority claimed from SE9602914A external-priority patent/SE507265C2/sv
Application filed by Renholmens Mekaniska Verkstad AB filed Critical Renholmens Mekaniska Verkstad AB
Publication of EP0929484A1 publication Critical patent/EP0929484A1/de
Application granted granted Critical
Publication of EP0929484B1 publication Critical patent/EP0929484B1/de
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
    • B27B31/00—Arrangements for conveying, loading, turning, adjusting, or discharging the log or timber, specially designed for saw mills or sawing machines
    • B27B31/006—Arrangements for conveying, loading, turning, adjusting, or discharging the log or timber, specially designed for saw mills or sawing machines with chains or belts

Definitions

  • the present invention relates to plant for feeding timber boards to and through a single-board feeder in accordance with the preamble of Claim 1.
  • the invention relates in particular to high-speed production plants, i.e. plants in which the boards are fed to different stations at high speeds.
  • the timber boards are normally transported in sawmills with their longitudinal axes transversal to the direction of conveyor belt movement.
  • the boards are not distributed uniformly on the belts and the spacings between the boards can vary widely.
  • the boards are advanced with the aid of so-called single-board feeders which grip boards stored temporarily in a buffer region and advance the boards one by one for further handling.
  • the general aim is to increase the rate of production and therewith the speed at which boards are transported through the plant, it is endeavoured to keep the buffer region upstream of the individual board feeder under control, so that the buffer region will neither be too large nor too small.
  • An excessively large buffer region will result in various kinds of disturbances in operation. For instance, the boards will not remain in contact with the conveyor, but will be pressed up and lifted in the buffer region. If the buffer region is too small or when no boards are present in said region, the feeder will stop. Both instances will immediately result in an interruption in production. Because a high production rate is contingent on the continuous outfeed of boards downstream of the board feeder, the buffer region must be kept constantly full of boards above a given lowest level, wherein the feeder output rate V ut , i.e.
  • the buffer region upstream of the board feeder can be said to form a magazine or storage facility and is thus necessary for single-board feeding.
  • the conveyor belt of the embodiment illustrated in Fig. 1 has the form of a belt conveyor 1 whose board-feeding rate is referenced V in .
  • the reference numeral 2 identifies a single-board feeder whose board-feeding rate is referenced V ut .
  • the conveyor 1 moves the boards 4 at the speed V in , said boards lying cross-wise to the conveying direction.
  • the boards 4 will not normally be distributed regularly on the conveyor 1, but may be spaced unevenly therealong. This is indicated on the left of the Figure.
  • the single-board feeder 2 is intended to feed the boards one by one on a forwarding conveyor provided with dogging means, as indicated on the right of the Figure, it is necessary to obtain a given temporary storage or buffer 3 upstream of the single-board feeder. This buffer is obtained by ensuring that V in is greater than V ut , as earlier indicated.
  • the aforedescribed forms part of the known technology and a more detailed description is thereof unnecessary.
  • the invention enables the buffer region 3 upstream of the single-board feeder 2 to be maintained within a controlled size.
  • a regulator which includes endless belts 5 disposed across the width of the conveyor 1, each of said belts being guided over respective guide wheels or rollers 6, of which one is driven.
  • the upper run of the endless belt 5 is located above the upper transporting plane of the conveyor 1 and will thus engage the timber boards 4.
  • the upper run of the belt 5 shall move in the transporting direction of the conveyor 1.
  • the speed of the belt 5 is V reg , which is lower than the speed V in of the conveyor 1.
  • the unevenly distributed boards 4 transported on the conveyor 1 will either be gripped or retarded by the belt 5 as a result of the difference between the speeds V in and V reg .
  • a pre-buffer 3' will be built-up with boards on the upper run of the belt 5 at the same time as the regulator device will deliver the boards that collect thereon in a delayed rate to the conveyor 1 upstream of the single-board feeder 2 when so required by the feeder buffer 3.
  • the pre-buffer 3' can be allowed to grow or expand to a given extent upstream of the regulator.
  • the regulator can be constructed to adapt to different speeds of the conveyor 1, and also to different board dimensions and feeder capacities.
  • the regulator speed V reg will normally lie between V in and V ut .
  • the invention thus provides a highly flexible arrangement which can be installed in existing plants to solve an existing serious problem, particularly in the case of high-production plants.
  • the conveyor belts may be of any appropriate kind and made from any suitable material, including high friction chains, provided that they will lower the rate of feed of the boards the speed V reg .

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Attitude Control For Articles On Conveyors (AREA)
  • Feeding Of Articles To Conveyors (AREA)
  • Paper (AREA)
  • Interface Circuits In Exchanges (AREA)

Claims (4)

  1. Anlage zum Zuführen von Holzbrettern (4) zu und durch eine Einzelbrettzuführung (2) für längliche Holzbretter (4), welche nacheinander quer zu dessen Längsachse auf einem Förderer (1) liegen, wobei der Förderer die Bretter mit einer Geschwindigkeit Vin zur Einzelbrettzuführung (2) vorschiebt, welche mit einer Brett-Zuführungsgeschwindigkeit Vut arbeitet, die niedriger ist als Vin, gekennzeichnet durch ein in Förderrichtung gesehen vor der Brettzuführung (2) und der Pufferzone (3) in der Nähe derselben angeordnetes Regelmittel (5, 6), wobei das Regelmittel die auf dem Förderer (1) vorwärts bewegtere Bretter (4) auf eine Geschwindigkeit Vreg verlangsamt, welche langsamer ist als Vin, bevor die Bretter (4) auf dem Förderer (1) zur Brettzuführung (2) weiterbefördert werden.
  2. Anlage nach Anspruch 1, dadurch gekennzeichnet, dass das Regelmittel endlose Bänder (5) oder Ketten mit hoher Reibung enthält, welche quer über die Breite des Förderers (1) verlaufen und jeweils über mindestens zwei Führungsrollen (6) laufen, wobei die Obergurte im Regelmittel über der Förderebene des Förderers (1) liegen und sich mit einer Geschwindigkeit Vreg bewegen, welche niedriger ist als Vin.
  3. Anlage nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Geschwindigkeit Vreg der Regelmittel grösser ist als die Geschwindigkeit Vut der Einzelbrettzuführung (2), jedoch niedriger als die Zuführungsgeschwindigkeit Vin des Förderers.
  4. Verfahren zur Steuerung der Zuführung von Holzbrettern zu und durch eine Einzelbrettzuführung (2), wobei die Bretter nacheinander quer zur Zuführungsrichtung auf einem Förderer (1) mit einer Brett-Zufuhrgeschwindigkeit Vin zur Einzelbrettzuführung (2) transportiert werden, wobei die Zuführung (2) mit einer Brett-Zuführungsgeschwindigkeit Vut arbeitet, die niedriger ist als Vin, dadurch gekennzeichnet, dass die Bretter (4) in Förderrichtung gesehen vor der Einzelbrett-Zuführung (2) und der Pufferzone (3) neben derselben mit einer Geschwindigkeit Vreg bewegt werden, welche langsamer ist als Vin, bevor die Bretter auf dem Förderer (1) zur Einzelbrett-Zuführung (2) weiterbefördert werden.
EP97919812A 1996-04-12 1997-03-25 Anlage zum zuführen von baumstämmen zu einer vereinzeleinrichtung Expired - Lifetime EP0929484B1 (de)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
SE9601389 1996-04-12
SE9601389A SE510399C2 (sv) 1996-04-12 1996-04-12 Anordning för styrd doserad frammatning av virkesstycken
SE9602914A SE507265C2 (sv) 1996-08-02 1996-08-02 Anordning och förfarande i anslutning till en enstycksmatare
SE9602914 1996-08-02
PCT/SE1997/000514 WO1997038929A1 (en) 1996-04-12 1997-03-25 A set-up for feeding timber to a single-log feeder

Publications (2)

Publication Number Publication Date
EP0929484A1 EP0929484A1 (de) 1999-07-21
EP0929484B1 true EP0929484B1 (de) 2004-03-03

Family

ID=26662581

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97919812A Expired - Lifetime EP0929484B1 (de) 1996-04-12 1997-03-25 Anlage zum zuführen von baumstämmen zu einer vereinzeleinrichtung

Country Status (5)

Country Link
EP (1) EP0929484B1 (de)
AT (1) ATE260846T1 (de)
AU (1) AU2416097A (de)
DE (1) DE69727950T2 (de)
WO (1) WO1997038929A1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE509744C2 (sv) * 1998-03-10 1999-03-01 Renholmens Mek Verkstad Ab Skiktare för sågvirke
SE519998C2 (sv) * 2001-09-03 2003-05-06 Renholmens Mek Verkst Ab Anordning för momentan separation av i skikt frammatade virkesstycken
CA2469544C (en) 2003-05-30 2009-03-24 Darryl Irwin Kujat Elevated grade station drive system
GB2421676B (en) * 2004-12-30 2010-03-24 Fmc Technologies Portioning apparatus and method

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2128182B1 (de) * 1971-03-10 1975-06-06 Guilliet Ets
DE3316284A1 (de) * 1983-05-04 1984-11-08 Maschinenfabrik Esterer AG, 8262 Altötting Vorrichtung zum aufrechterhalten einer bestimmten lage eines angeflachten holzes beim transport zwischen arbeitsstationen
IT1266179B1 (it) * 1994-07-20 1996-12-23 Cavanna Spa Dispositivo e procedimento per regolare l'avanzamento di articoli, ad esempio in impianti per il confezionamento automatico di prodotti

Also Published As

Publication number Publication date
DE69727950D1 (de) 2004-04-08
WO1997038929A1 (en) 1997-10-23
AU2416097A (en) 1997-11-07
ATE260846T1 (de) 2004-03-15
EP0929484A1 (de) 1999-07-21
DE69727950T2 (de) 2005-03-10

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