WO1987007203A1 - Appareil pour mesurer le diametre d'une grume - Google Patents

Appareil pour mesurer le diametre d'une grume Download PDF

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Publication number
WO1987007203A1
WO1987007203A1 PCT/SE1987/000248 SE8700248W WO8707203A1 WO 1987007203 A1 WO1987007203 A1 WO 1987007203A1 SE 8700248 W SE8700248 W SE 8700248W WO 8707203 A1 WO8707203 A1 WO 8707203A1
Authority
WO
WIPO (PCT)
Prior art keywords
log
rollers
transducer
diameter
feeding device
Prior art date
Application number
PCT/SE1987/000248
Other languages
English (en)
Inventor
Roger Jonsson
Original Assignee
Söderhamns Verkstäder 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 Söderhamns Verkstäder Ab filed Critical Söderhamns Verkstäder Ab
Publication of WO1987007203A1 publication Critical patent/WO1987007203A1/fr
Priority to NO880242A priority Critical patent/NO880242L/no
Priority to FI880287A priority patent/FI880287A/fi

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
    • G01B5/0035—Measuring of dimensions of trees
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27L—REMOVING BARK OR VESTIGES OF BRANCHES; SPLITTING WOOD; MANUFACTURE OF VENEER, WOODEN STICKS, WOOD SHAVINGS, WOOD FIBRES OR WOOD POWDER
    • B27L1/00—Debarking or removing vestiges of branches from trees or logs; Machines therefor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/12—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring diameters

Definitions

  • This invention relates to an apparatus for mea ⁇ suring the diameter of logs in a log-feeding device included in a barking machine of the rotation ring type, said feeding device comprising at least three, 5 and preferably precisely three, rotary feed and/or support rollers movable in a coordinated manner sub ⁇ stantially radially relative to the centre of the machine by means of a link system.
  • a log-feeding device included in a barking machine of the rotation ring type
  • said feeding device comprising at least three, 5 and preferably precisely three, rotary feed and/or support rollers movable in a coordinated manner sub ⁇ stantially radially relative to the centre of the machine by means of a link system.
  • barking machines of the above type are used in sawmills where they precede the different sawing devices of the sawmill and are disposed prima ⁇ rily in conjunction with the block-sawing machines where, in an initial step, the log is slabbed on two
  • logs 25 are easily affected by pieces of bark and similar waste products which may accompany the log from the barking machine. Further, logs do not generally have a circular cross-section but a substantially oval one. Therefore, when using traditional optical measur-
  • the present invention aims at overcoming the above-mentioned drawbacks inherent in prior art op ⁇ tical measuring devices by providing an apparatus for measuring the diameter of logs which is able in a simple and most reliable manner to measure the average diameter of the log. According to the invention, this is achieved by means of an apparatus which is charac ⁇ terized in that a transducer, preferably in the form of a potentiometer, connected to a computing device is adapted to sense the radial positions and/or move ⁇ ments of the rollers and to continuously or intermit ⁇ tently transmit to said computing device the measured values received when a log is fed through the feeding device.
  • a transducer preferably in the form of a potentiometer
  • Fig. 1 shows the outfeed side of a barking machine comprising a log-feeding device which in accordance with the invention is provided with a transducer
  • Fig. 2 shows the upper part of the same barking machine as seen from the side.
  • a barking machine of the rotation ring type is designated 1 and a log-feeding device included therein is designated 2.
  • 3 designates three spiked rollers which form part of the log-feeding device and each of which is mounted on a pivot arm 4.
  • two relatively short levers 5, 5', 6, 6', 7, 7' are fixedly mounted, the levers facing each other being interconnected by means of link arms 9, 9 1 , 9".
  • a further, rela ⁇ tively short lever 8 is fixedly mounted, to which suitably hydropneumatic resilient means 10 is con ⁇ nected.
  • rollers 3 are movable in a coordinated manner towards and away from the centre of the barking machine by means of the link arms 9 and the levers 5, 6 and 7.
  • the force applied by the resilient means 10 to the link system will load all the rollers 3 equally.
  • a transducer in the form of a potentiometer 11 fixedly mounted on the barking machine 1 is articulated to the lever 8. This transducer senses the position of the lever 8 and, hence, indirectly the position of the rollers 3. Since the position of the rollers is determined by the dia- meter of a log being fed between the rollers, the values received from the transducer provide a basis for calculating the diameter of the part of the log situated between the rollers.
  • a small-size computer (not shown) is connected to the transducer.
  • the computer unit is equipped with required modules for computing the diameter of the logs on the basis of the values received from the transducer, for presentation thereof on a display and for communication with a control device for block- sawing machines.
  • an impulse is supplied to the mea- suring equipment which then initiates the measuring operation.
  • the transducer is read, preferably in a num ⁇ ber of preset points at the top end and once at the butt end to check that the log is turned right way round.
  • the positions for initiating the measurement may of course be changed.
  • use is made of the minimum diameter value measured.
  • the diameter value corre ⁇ sponding to the innermost position of the feed rollers can be changed, i.e. the entire diameter scale can be changed by a constant value.
  • a linear potentiometer connected to the lever 8. This means that a circular movement is transformed into a linear movement, which entails that the values received from the transducer do not have a linear relationship.
  • the inventive measuring apparatus provides a most accurate measuring value of the average diameter of the log. This value is so exact that it can be used, in con ⁇ nection with a length measurement, e.g. by means of a photo cell and a pulse meter, for wood value determina ⁇ tions, i.e. for establishing the compensation a supplier should receive for the timber he has supplied.
  • Other major advantages of the apparatus according to the invention are that it can easily be mounted on existing barking machines and that it is very in ⁇ expensive to manufacture since the rollers included therein can be used as sensing means together with a relatively inexpensive potentiometer which can easily be mounted on the barking machine without any major modifications thereof.
  • the transducer can be connected to a small-size computer unit which contains a queue register and can be connected to a servo-mechanism for automatic re-setting of the block-sawing machines.
  • the number of logs having passed through the barking machine and been measured is input in the queue register together with the respective measured values, whereupon the block-sawing machine is re-set when the respective log passes a transducer, e.g. in the form of a photo cell, arranged in con ⁇ junction with the block-sawing machine.
  • a transducer e.g. in the form of a photo cell, arranged in con ⁇ junction with the block-sawing machine.
  • the transducer need not be a linearly operating po- tentiometer but may instead be a circular potentiometer having substantially the same radius as the lever on which it is mounted.
  • the transducer may also consist of a pulse transducer and need not necessarily be mounted precisely on the lever described above, but may be connected to any suitable, movable part of the mechanism controlling the radial movements of the rollers, including locations on or in the resi- lient means.
  • the rollers need not necessarily be driving but may for instance have a supporting func ⁇ tion only.
  • the above-described apparatus for measuring the diameter of logs may particularly advantageous- ly be combined with an apparatus for measuring the length of the logs, which is connected to one and the same computer unit.
  • a length measuring appa ⁇ ratus may consist of a pulse transducer and two photo cells one of which is placed in front of the feeding device 2 and the other behind it.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Botany (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Debarking, Splitting, And Disintegration Of Timber (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

Un dispositif d'alimentation en grumes (2), de préférence faisant partie d'une machine à écorcer du type à anneau rotatif (1), comporte un appareil servant à mesurer le diamètre des grumes et comportant au moins trois, et de préférence exactement trois, rouleaux rotatifs (3), pouvant se déplacer de manière coordonnée et essentiellement radiale par rapport au centre de la machine (1) au moyen d'un système de liaison (9). Un capteur (11) relié à un dispositif de calcul permet de détecter les positions et/ou mouvements radiaux des rouleaux (3) et de transmettre en continu ou de façon intermittente audit dispositif de calcul les valeurs mesurées reçues lorsqu'on fait passer une grume dans le dispositif d'alimentation (2).
PCT/SE1987/000248 1986-05-22 1987-05-20 Appareil pour mesurer le diametre d'une grume WO1987007203A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
NO880242A NO880242L (no) 1986-05-22 1988-01-21 Innretning for maaling av stokkers diameter.
FI880287A FI880287A (fi) 1986-05-22 1988-01-22 Anordning foer maetning av diametern hos stockar.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8602329-8 1986-05-22
SE8602329A SE8602329L (sv) 1986-05-22 1986-05-22 Anordning for metning av diametern hos stockar

Publications (1)

Publication Number Publication Date
WO1987007203A1 true WO1987007203A1 (fr) 1987-12-03

Family

ID=20364609

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1987/000248 WO1987007203A1 (fr) 1986-05-22 1987-05-20 Appareil pour mesurer le diametre d'une grume

Country Status (4)

Country Link
AU (1) AU7512787A (fr)
FI (1) FI880287A (fr)
SE (1) SE8602329L (fr)
WO (1) WO1987007203A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009112627A1 (fr) * 2008-03-12 2009-09-17 Jussi-Pekka Usenius Procédé et dispositif de mesure des propriétés du bois
JP2016095269A (ja) * 2014-11-17 2016-05-26 株式会社東京精密 形状測定機及び形状測定方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE74414C1 (fr) *
SE305547B (fr) * 1965-06-16 1968-10-28 S Casselbrant
SE343391B (fr) * 1970-11-06 1972-03-06 Oestbergs Fabriks Ab
SE353958B (fr) * 1967-04-19 1973-02-19 Asea Ab
SE421453B (sv) * 1977-04-13 1981-12-21 Valmet Oy Anordning for att meta en dimension hos ett foremal med hjelp av ett over foremal gripande griporgan, serskilt for att meta dimametern hos en tredstam

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE74414C1 (fr) *
SE305547B (fr) * 1965-06-16 1968-10-28 S Casselbrant
SE353958B (fr) * 1967-04-19 1973-02-19 Asea Ab
SE343391B (fr) * 1970-11-06 1972-03-06 Oestbergs Fabriks Ab
SE421453B (sv) * 1977-04-13 1981-12-21 Valmet Oy Anordning for att meta en dimension hos ett foremal med hjelp av ett over foremal gripande griporgan, serskilt for att meta dimametern hos en tredstam

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009112627A1 (fr) * 2008-03-12 2009-09-17 Jussi-Pekka Usenius Procédé et dispositif de mesure des propriétés du bois
JP2016095269A (ja) * 2014-11-17 2016-05-26 株式会社東京精密 形状測定機及び形状測定方法

Also Published As

Publication number Publication date
AU7512787A (en) 1987-12-22
SE8602329L (sv) 1987-11-23
SE8602329D0 (sv) 1986-05-22
FI880287A0 (fi) 1988-01-22
FI880287A (fi) 1988-01-22

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