US3812893A - Method and apparatus for cutting veneer produced by means of turning on a lathe into sheets with uniform fibre configuration - Google Patents

Method and apparatus for cutting veneer produced by means of turning on a lathe into sheets with uniform fibre configuration Download PDF

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Publication number
US3812893A
US3812893A US00265019A US26501972A US3812893A US 3812893 A US3812893 A US 3812893A US 00265019 A US00265019 A US 00265019A US 26501972 A US26501972 A US 26501972A US 3812893 A US3812893 A US 3812893A
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United States
Prior art keywords
cutting
log
veneer
lathe
substance
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Expired - Lifetime
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US00265019A
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English (en)
Inventor
A Ervast
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MESSERS TIMI
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MESSERS TIMI
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Publication date
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    • 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
    • B27L5/00—Manufacture of veneer ; Preparatory processing therefor
    • B27L5/08—Severing sheets or segments from veneer strips; Shearing devices therefor; Making veneer blanks, e.g. trimming to size

Definitions

  • ABSTRACT A method and apparatus for cutting veneer produced by means of turning on a lathe into sheets by first fitting the surface of the log of the veneer with cut markings that, as viewed from the axis of rotation of the log, lie at least approximately on the same radius or radii and by then cutting the veneer into sheets in accordance with the marks on the veneer surface so that a uniform fibre configuration is achieved.
  • a cutting mark a marking substance that is fed onto the log surface by means of a marking equipment synchronized with the movement of rotation of the log.
  • the cutting mark is indicated by means of an indicator device and the cutter is adjusted to cut off the veneer at any desired phase shift in relation to the marks on the veneer face by using a control unit guided by the indicator equipment.
  • the present invention concerns a method for cutting veneer produced by means of turning on a lathe into sheets with uniform fibre configuration by first fitting the surface of the log or of the veneer with cut markings that, as viewed from the axis of rotation of the log, lie at least approximately on the same radius or radii and by then cutting the veneer into sheets in accordance with the marks on the veneer surface.
  • the invention also concerns an apparatus to be used for carrying out this method and consisting of a marking equipment, indicator equipment, control unit, and cutting device.
  • the log to be turned may, for example, first be marked so that the veneer being cut by turning is cut off at every rotation of the lathe, or a radial hole may be drilled into the log to be turned and the cutter may be guided by the holes in the veneer mat produced by the hole drilled.
  • the former method is slow, because the lathe must be stopped several times during the turning of each log for marking.
  • the method has the disadvantage that it is difficult to make the indicator of cutting marks, which controls the cutter, absolutely certainly distinguish the markings made from other holes that may appear in the veneer.
  • Another disadvantage is that unless the mark drilling is made definitely in the most favourable position in the log, which may, moreover, have different positions inside the log and on the outer surface, the drilling causes reduced quantity. and quality of the veneer obtained from the log.
  • the method according to the invention is mainly characterized in that as a cutting mark is used a marking substance that is fed onto the log surface by means of a marking equipment synchronized with the movement of rotation of the log, the cutting mark is indicated by means of an indicator device known per se, and the cutter is adjusted to cut off the veneer at any desired phase shift in relation to the marks on the veneer face by using a control unit guided by the indicator equipment.
  • the equipment according to the invention is, on the other hand, characterized in that the marking equipment consists of a spraying device that sprays the marking substance as being synchronized with the movement of rotation of the log and that is guided by a spray-control device, and the indicator equipment comprises a lamp transmitting ultra-violet radiation, an ultra-violet filter, and a photo-active unit, and the cutter control unit, which operates on the basis of impulses given by the indicator equipment, is fitted with a phaseshift controller known per so.
  • the markings are during the turning operation substantially invisible, but they can be detected by means of the indicator.
  • the cutter can be synchronized by means of these markings, but the cutting does not have to be carried out always exactly at the marking but it may be carried out at any point that is most favourable for the use of raw-material.
  • the cutting marks are produced during the turning operation by spraying them by means of a spraying device 4 controlled from the lathe shaft 15 onto the veneer 3 being cut by the lathe with a marking substance that is invisible but that can be indicated by means of ultra-violet radiation or of any equivalent means.
  • the cutter 12 control unit 10 is synchronized, which unit is characterized in a continuous adjustment of phase shift in relation to the marks so that the cutting position can be shifted to any desired point in relation to the marks.
  • the control unit 10 is able to operate with the given rhythm even if some cutting marks were left out in between for some reason.
  • a preferred marking substance is a fluorescent liquid.
  • marks are sprayed by means of a fluorescent liquid once per each rotation of the lathe by means of the spraying device 4, which is controlled by means of a spray-control device 5, which senses the control impulses on the lathe shaft 15.
  • the marks which are invisible in normal light, are indicated at the cutting site by means of an indicator that comprises a lamp 6 giving ultra-violet radiation, an ultra-violet filter 7 that lets through only the part within the range of visible light of the radiation reflected from the cutting mark, and a photo-active unit 8.
  • the entrance of visible light into the inspection point is prevented by means of a protection bulb 9.
  • the photo-active unit 8 controls the cutter control unit 10, which comprises the memory of the cutting rhythm and the adjuster ll of the phase shift.
  • the synchronization of the marking has been achieved by means of an eccentric section 13 on the lathe shaft 15.
  • marking substance has been used in the example case an ordinary optical whitewashing substance that is fed through a nozzle 14 onto the surface of the log 1.
  • the wave length of the radiation transmitted by the ultra-violet lamp 6 is in the example case 365 mm, and the filter 7 is an ordinary yellow filter.
  • the photo-active unit 8 is a photo-resistance, photo-cell or equivalent.
  • the invention may show even considerable variation.
  • a fluorescent substance for example, a phosphorescent, radio-active or magnetic substance.
  • an indicator sensitive to each of these particular marking substances has to be used.
  • a method of cutting a continuous sheet of veneer produced by peeling a log rotating on a lathe into sheet portions which comprises:
  • Apparatus for cutting a continuous sheet of veneer produced by peeling a log rotating on a lathe into sheet portions which comprises:
  • an indicator having actuating means responsive to passage of a cutting mark past the same and located a predetermined distance ahead of the cutting device

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Manufacture Of Wood Veneers (AREA)
  • Veneer Processing And Manufacture Of Plywood (AREA)
US00265019A 1971-06-22 1972-06-21 Method and apparatus for cutting veneer produced by means of turning on a lathe into sheets with uniform fibre configuration Expired - Lifetime US3812893A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI711772A FI45836C (fi) 1971-06-22 1971-06-22 Menetelmä ja laitteisto sorvaamalla valmistettavan puuviilun leikkaami seksi syykuvioiltaan yhdenmukaisiksi arkeiksi.

Publications (1)

Publication Number Publication Date
US3812893A true US3812893A (en) 1974-05-28

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00265019A Expired - Lifetime US3812893A (en) 1971-06-22 1972-06-21 Method and apparatus for cutting veneer produced by means of turning on a lathe into sheets with uniform fibre configuration

Country Status (4)

Country Link
US (1) US3812893A (OSRAM)
DE (1) DE2230180A1 (OSRAM)
FI (1) FI45836C (OSRAM)
IT (1) IT959193B (OSRAM)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3908725A (en) * 1974-02-01 1975-09-30 Us Agriculture Method for producing parallel laminated pine lumber from veneer
US3970124A (en) * 1974-07-03 1976-07-20 Logging Development Corporation Method and apparatus for severing and marking trees
WO2003057480A1 (de) * 2002-01-12 2003-07-17 Reholz Gmbh Schichtwerkstoff

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1158925B (it) * 1983-04-01 1987-02-25 Saiag Spa Procedimento ed apparecchiatura per realizzare mediante estrusione continua un profilato in particolare una guarnizione di tenuta per carozzerie di autoveicoli presentante successivi tratti di lunghezze predeterminate aventi ciascuno una rispettiva sezione prestabilita e trafilato ottenuto con tale procedimento

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE590788C (de) * 1931-07-19 1934-01-11 C L P Fleck Soehne G M B H Automatischer Furnierbandkuerzer
US2938552A (en) * 1957-03-22 1960-05-31 Southern Wood Preserving Co Apparatus for trimming and sorting switch ties
US3079963A (en) * 1960-12-08 1963-03-05 Elwood H Kime Lumber marking machine
US3244206A (en) * 1963-03-08 1966-04-05 Industrial Nucleonics Corp Control apparatus for a veneer lathe
US3289581A (en) * 1964-05-12 1966-12-06 Vandercook & Sons Inc Ink monitoring system for printing presses
US3521598A (en) * 1968-06-07 1970-07-21 Reynolds Metals Co Spray coating control apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE590788C (de) * 1931-07-19 1934-01-11 C L P Fleck Soehne G M B H Automatischer Furnierbandkuerzer
US2938552A (en) * 1957-03-22 1960-05-31 Southern Wood Preserving Co Apparatus for trimming and sorting switch ties
US3079963A (en) * 1960-12-08 1963-03-05 Elwood H Kime Lumber marking machine
US3244206A (en) * 1963-03-08 1966-04-05 Industrial Nucleonics Corp Control apparatus for a veneer lathe
US3289581A (en) * 1964-05-12 1966-12-06 Vandercook & Sons Inc Ink monitoring system for printing presses
US3521598A (en) * 1968-06-07 1970-07-21 Reynolds Metals Co Spray coating control apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3908725A (en) * 1974-02-01 1975-09-30 Us Agriculture Method for producing parallel laminated pine lumber from veneer
US3970124A (en) * 1974-07-03 1976-07-20 Logging Development Corporation Method and apparatus for severing and marking trees
WO2003057480A1 (de) * 2002-01-12 2003-07-17 Reholz Gmbh Schichtwerkstoff

Also Published As

Publication number Publication date
FI45836B (OSRAM) 1972-06-30
FI45836C (fi) 1972-10-10
IT959193B (it) 1973-11-10
DE2230180A1 (de) 1973-01-11

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