EP0386813A2 - Vorrichtung zum axialen Ein- und Ausspannen von Holzstämmen in Furnierscheidmaschinen - Google Patents

Vorrichtung zum axialen Ein- und Ausspannen von Holzstämmen in Furnierscheidmaschinen Download PDF

Info

Publication number: EP0386813A2
Authority: EP; European Patent Office
Prior art keywords: log; teeth; shaft; wood; veneer cutting
Prior art date: 1989-03-10
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.): Granted

Application number

EP90200378A

Other languages

English (en)

French (fr)

Other versions

EP0386813A3 (de

EP0386813B1 (de

Inventor

Lorenzo Cremona

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.)

Angelo Cremona e Figlio SpA

Original Assignee

Angelo Cremona e Figlio SpA

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.)

1989-03-10

Filing date

1990-02-16

Publication date

1990-09-12

1990-02-16 Application filed by Angelo Cremona e Figlio SpA filed Critical Angelo Cremona e Figlio SpA

1990-09-12 Publication of EP0386813A2 publication Critical patent/EP0386813A2/de

1991-11-13 Publication of EP0386813A3 publication Critical patent/EP0386813A3/de

1994-01-05 Application granted granted Critical

1994-01-05 Publication of EP0386813B1 publication Critical patent/EP0386813B1/de

2010-02-16 Anticipated expiration legal-status Critical

Status 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
- 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
- B27L5/02—Cutting strips from a rotating trunk or piece; Veneer lathes

Definitions

This invention refers to a device for engaging and disengaging claws axially gripping a log of wood inserted in a veneer cutting machine.
Said claws are axially movable so as to enable them to move away from and towards the ends of the log and thus keep it secured to the spindles during the cutting and, at the end of the operation, to release the remaining core of wood which is conveyed away from the machine in order to make room for the next log.
the general scope of this invention is to obviate the aforementioned problem by providing devices which ensure efficient disengagement of the gripping claws from the ends of the residual core of wood in veneer cutting machines.
a device for axial engagement and disengagement of one end of a log of wood rotating in a veneer cutting machine of the type comprising a claw, having a plurality of teeth which penetrate into the wood, disposed on a shaft which rotates by means of a coupling with a spindle in which said shaft slides axially from a first position in which the teeth penetrate the log to a second position in which the teeth are removed from the log, in order to insert the teeth into the end of the log and thus cause it to rotate for the veneer cutting operations while cooperating with a similar device at the other end of the log, characterized by the fact that disposed coaxially to said claw is a pusher which is positively movable, by means of actuators, from a retracted position in which it does not interfere with the log penetrated by the teeth to an extracted position in which it pushes the log away from said teeth during the substantially simultaneous movement of the shaft from said first to said second position.
a device for engaging and disengaging a plurality of teeth 10 of a claw 13 in one end of a log 14 comprises a shaft 15 carrying the claw 13 and fitted, slidingly but not rotatingly, by means of a splined profile 16, into couplings 24 in a spindle 18.
the spindle 18 in turn is housed, by means of bearings 17 and 19, in a supporting upright secured to the floor.
the shaft 15 is axially movable by known traversing means (for example hydraulic), not shown, to enable the gripping claws to carry out said known movement towards and away from the end of the log.
known traversing means for example hydraulic
a single-acting piston 20 hydraulically or pneumatically operated by means of a duct 21 inside the shaft 15 and connected by means of a rotating joint 23 of known technique to a supply system which is not shown since it can be of any known type.
the shaft 15 is free to rotate driven by the spindle 18 which, in order to rotate, is connected to a pulley 25 coaxial thereto.
the piston 20 acts upon a pusher 22 which passes axially through the claw 13 between the teeth 10.
the device 12 and a device 12′ of identical structure form an integral part of a veneer cutting machine 26 the remainder of which is made according to the known technique and is therefore neither described nor drawn in detail.
the two devices 12, 12′ are disposed at both ends of the log 14 and the device 12 is provided with a coupling 27 between the pulley 25 and an electric motor 28.
the device 12′ Since the device 12′ is not connected to driving mechanisms, obviously, it need not necessarily be provided with the pulley 25.
the shafts 15, 15′ are pushed by the known traversing means so that the teeth of the claws 13, 13′ engage in the ends of the log positioned between them so that the spindle 18 can drive it round when the motor 28 is turned on for the veneer cutting operations.
the shafts 15, 15′ retract and at the same time the pistons inside them are fed so as to operate the pushers in the claws which exert pressure on the ends of the log thus reliably disengaging it from the teeth 10, 10′.
the device is thus able to exert all the necessary force to disengage the teeth of the claws from the wood without, however, reducing in any way whatsoever the force available for penetration of the teeth in order to secure the log.
the mechanisms transmitting motion to the spindle 18 may be of any type known to the technician and not necessarily belts and pulleys as shown in the figures.
the means for preventing relative rotatory movement between the spindle and the sliding shaft may also be different, as is easily imaginable by any technician expert in the field.

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)
Medicines Containing Plant Substances (AREA)
Debarking, Splitting, And Disintegration Of Timber (AREA)

EP90200378A 1989-03-10 1990-02-16 Vorrichtung zum axialen Ein- und Ausspannen von Holzstämmen in Furnierscheidmaschinen Expired - Lifetime EP0386813B1 (de)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
IT2071889U		1989-03-10
IT8920718U IT215761Z2 (it)	1989-03-10	1989-03-10	Dispositivo di innesto e disinnesto assiale di tronchi di legno in macchine sfogliatrici.

Publications (3)

Publication Number	Publication Date
EP0386813A2 true EP0386813A2 (de)	1990-09-12
EP0386813A3 EP0386813A3 (de)	1991-11-13
EP0386813B1 EP0386813B1 (de)	1994-01-05

Family

ID=11171038

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP90200378A Expired - Lifetime EP0386813B1 (de)	1989-03-10	1990-02-16	Vorrichtung zum axialen Ein- und Ausspannen von Holzstämmen in Furnierscheidmaschinen

Country Status (7)

Country	Link
EP (1)	EP0386813B1 (de)
AT (1)	ATE99589T1 (de)
DE (1)	DE69005667T2 (de)
DK (1)	DK0386813T3 (de)
ES (1)	ES2049401T3 (de)
FI (1)	FI901172A7 (de)
IT (1)	IT215761Z2 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
WO2004094121A1 (de) *	2002-12-13	2004-11-04	Grenzebach Bsh Gmbh	Furniermessermaschine

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US2194391A (en) *	1939-03-08	1940-03-19	Jabez N Ingalsbe	Driving head for lathes
US3176735A (en) *	1961-08-22	1965-04-06	Coe Mfg Co	Veneer lathe
US4603744A (en) *	1984-11-01	1986-08-05	Ramirez Frank L	Weed extractor device

1989
- 1989-03-10 IT IT8920718U patent/IT215761Z2/it active
1990
- 1990-02-16 ES ES90200378T patent/ES2049401T3/es not_active Expired - Lifetime
- 1990-02-16 AT AT90200378T patent/ATE99589T1/de active
- 1990-02-16 EP EP90200378A patent/EP0386813B1/de not_active Expired - Lifetime
- 1990-02-16 DE DE69005667T patent/DE69005667T2/de not_active Expired - Fee Related
- 1990-02-16 DK DK90200378.9T patent/DK0386813T3/da active
- 1990-03-08 FI FI901172A patent/FI901172A7/fi not_active Application Discontinuation

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
WO2004094121A1 (de) *	2002-12-13	2004-11-04	Grenzebach Bsh Gmbh	Furniermessermaschine
US7100650B2 (en) *	2002-12-13	2006-09-05	Grenzebach-Bsh Gmbh	Veneer slicer

Also Published As

Publication number	Publication date
EP0386813A3 (de)	1991-11-13
IT8920718V0 (it)	1989-03-10
ATE99589T1 (de)	1994-01-15
DE69005667T2 (de)	1994-05-19
DK0386813T3 (da)	1994-01-31
IT215761Z2 (it)	1990-11-05
FI901172A7 (fi)	1990-09-11
ES2049401T3 (es)	1994-04-16
FI901172A0 (fi)	1990-03-08
EP0386813B1 (de)	1994-01-05
DE69005667D1 (de)	1994-02-17

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