EP0500161B1 - Sheet cutting station for rotary cut wood veneer - Google Patents
Sheet cutting station for rotary cut wood veneer Download PDFInfo
- Publication number
- EP0500161B1 EP0500161B1 EP92200356A EP92200356A EP0500161B1 EP 0500161 B1 EP0500161 B1 EP 0500161B1 EP 92200356 A EP92200356 A EP 92200356A EP 92200356 A EP92200356 A EP 92200356A EP 0500161 B1 EP0500161 B1 EP 0500161B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- strip
- station
- accordance
- cut
- transverse
- 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
Links
- 239000002023 wood Substances 0.000 title claims abstract description 16
- 230000007547 defect Effects 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 7
- 238000001514 detection method Methods 0.000 claims description 5
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims 1
- 230000002950 deficient Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 241000252254 Catostomidae Species 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 239000011093 chipboard Substances 0.000 description 1
- 230000001010 compromised effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000002916 wood waste Substances 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D11/00—Combinations of several similar cutting apparatus
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
- B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
- B26D1/12—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis
- B26D1/25—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member
- B26D1/34—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member moving about an axis parallel to the line of cut
- B26D1/40—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member moving about an axis parallel to the line of cut and coacting with a rotary member
- B26D1/405—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member moving about an axis parallel to the line of cut and coacting with a rotary member for thin material, e.g. for sheets, strips or the like
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
- B27G1/00—Machines or devices for removing knots or other irregularities or for filling-up holes
-
- 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
- CH 354890 discloses a transverse cutting apparatus in which cutting means comprises two side-by-side transverse blades. If the sheet is wide, then the two blades are operated simultaneously. If the sheet is narrower than one blade, only one blade is operated.
- a method of cutting as mentioned above is substantially the only one used at present and the only palliative found in the known art is reuse of the large quantity of transverse strips of scrap for low quality applications or production of chipboard or the like.
- the general purpose of the present invention is to obviate the above mentioned shortcomings by supplying a method and a machine for cutting veneer in sheets which would reject defective parts with minimal wood waste.
- a cutting station indicated as a whole by reference number 10 comprises in accordance with the present invention conveyor belts supplying a veneer strip 12 (arriving from veneer cutting machines of known type and hence not shown) in front of known systems 13 of detection of specific zones of the strip such as those containing defects.
- Said defect detection systems can for example comprise telecameras, transparency or reflection sensors or the like, as easily imagined by those skilled in the art, to supply information on the presence and position of defects such as for example holes in the veneer transiting opposite them.
- Such systems of defect detection of the known art being well known to those skilled in the art they are not described further.
- the means 14 comprise a circular shear 20 driven to cut the veneer in two parallel strips while the means 15 comprise, as better seen in FIG. 3, a rotary-blade cutter made up of blade units consisting of two blades 21 and 22 arranged side by side to rotate coaxially between bucking rollers 23 and 24 by motors 25 and 26 respectively having position sensors.
- Axial sliding is controlled by a double action piston 28 driven hydraulically through the ducts 40, 54 by a hydraulic control unit 29 connected to electronic processing and control means 19.
- an axially sliding clutch 30 having a spring 31, e.g. the Melville type, which usually holds it in engagement of the two blades (blades brought near).
- a spring 32 e.g. the Melville type, which usually holds it in engagement of the two blades (blades brought near).
- Another spring 32 weaker than the spring 31, placed in the piston 28, maintains axial tension of the blades.
- FIG. 4 shows schematically an example of an embodiment of the axial clutch 30.
- integral with the blade 21 is a supporting and containing structure 46 in which is inserted in a sliding manner a shaft 47 integral with the blade 22. Reciprocal rotation between the structure 46 and the shaft 47 is permitted by bearings 48 and 49.
- the spring 31 pushes between an element 50 integral with the shaft 47 and an element 51 rotating with the shaft 47, sliding coaxially thereto and butted axially on the structure 46 with an interposed bearing 52.
- the bearing 48 is of known type permitting mutual axial translation of the parts between which it is placed.
- selection means 16 selectively sending the cut sheets to an automatic stacker 18 and to a scrap bin 17.
- the selection means 16 are the vacuum type with top conveyor belt 33. Selection is performed separately in front of each blade 21 and 22 and is actuated by suckers 34 and 35. When one of the suckers is operated the wood sheet passing under it after leaving the cutter remains in adherence to the top belt 33, which deposits it on a double belt 36 for conveyance to the stacker 18 On the contrary, if the sucker is not operated the corresponding product leaving the cutter falls freely in the scrap bin 17.
- Said selectors are of the known art and therefore not further described nor shown.
- the stacker 18 can be of any type of the known art.
- a stacker comprising a top belt 37 which, by a vacuum method of the type described for the selector 16, conveys the wood sheets to deposit them in piles selected in accordance with the dimensions of the sheets and which form on the vertically movable tables with full width 38 or halved width 39 for the full width sheets 41 or half width sheets 42 respectively.
- All the various parts of the station are controlled and commanded to operate substantially as described below by electronic processing and control means 19, e.g. provided by programmed logics such as a microprocessor of the known art programmed in accordance with the description given below and optionally interconnected to a personal computer or the like.
- electronic processing and control means 19 e.g. provided by programmed logics such as a microprocessor of the known art programmed in accordance with the description given below and optionally interconnected to a personal computer or the like.
- the control device 19 in addition to processing the data from the sensor and synchronizing the movements of the various devices, commands coupling or not of the two blades of the transverse cutter depending on requirements.
- the device 19 commands the control unit 29 to supply fluid to the piston through the duct 54.
- the piston moves the blade 22 axially away from the blade 21, thus disengaging the clutch 30 and permitting the two motors 25 and 26 to rotate the respective blade independently with independent speeds.
- control device 19 To again engage the blades so that they behave substantially as a single blade the control device 19 first resynchronizes them electronically, putting the motors in step (by means of the signals emitted by their position sensors), so that the blades are rearranged as much as possible with parallel faces, and then commands the control unit 29 to supply the piston 28 with a fluid counterpressure through the duct 40, thus reconnecting the mechanical clutch 30 between the blades.
- the cutting station described above receives on its conveyors 11 an unbroken strip 12 of wood veneer.
- the sensor 13 scans the veneer in transit beneath it and sends corresponding signals to the control device 19.
- the possible conditions which can occur are 'no defect', 'defect on the right half of the veneer', 'defect on the left half of the veneer', 'defect on both halves of the veneer'.
- the distance between the vertical line of the sensor and the shear 14 permits the processing system 19 to select the best plan for minimizing wood scrap before the zone involved reaches said shear.
- the system decides whether to start the longitudinal cut or not and whether to perform a transverse cut on the entire width of the veneer or only on one half of it.
- FIG. 5 shows schematically a possible cutting situation in which the parts of the veneer to be scrapped are identified by oblique lines.
- the control means 19 activate the longitudinal shear 20 and remove the defect, commanding the blade 21 or 22 corresponding to the defective half so as to remove a strip with the defect, which will be scrapped by the selector means 16. In this manner the half free of defects is not uselessly scrapped as would happen by the known art but there is produced a wood sheet of half width as indicated by 42.
- the longitudinal cut can be maintained until a defect free section of wood is detected for a length of veneer sufficient to justify obtaining a full width sheet without creating a preceding half sheet too short.
- a defect free section of wood is detected for a length of veneer sufficient to justify obtaining a full width sheet without creating a preceding half sheet too short.
- the section of veneer indicated by 44 in FIG. 5 would be acceptable.
- the senor detects defects affecting both halves of the veneer, e.g. as indicated at 45, the entire defective strip is removed by a double paired cut of the blades 21 and 22.
- the blades 21 and 22 are commanded by the device 19 at intervals so as to always obtain sheets, halved or not, of a length not exceeding a preset value.
- the control system can also be programmed to optimize the positions of the transverse cuts so as not to obtain, as far as possible, sheets shorter than a preset value.
- FIGS. 6 and 7 show schematically a different transverse cutter 15' usable in place of the cutter 15.
- the cutter 15' comprises a shaft 56 on which are supported independently in a rotating manner two blade holder units each with a plurality 50, 60 of equally spaced radial blades as may be seen well in FIG. 7.
- bucking roller 61 Parallel to the shaft 56 is a bucking roller 61 on which slides the veneer 12.
- Each blade holder 57 and 58 is rotated by a motor 62 or 63 through a kinematic transmission, e.g: with a chain, 64 and 65.
- the motors are mechanically engaged together through an electromechanical joint of the known art, e.g the electromagnetic type controlled by the device 19.
- the cutting station operates as described above.
- the joint 66 When cuts are to be made on half strips the joint 66 is disengaged and the motors drive the blade holders independently.
- the device 19 first synchronizes the blades by controlling the motors 62, 63 through position sensors, similarly to the motors of the cutter 15, and then operates the clutch 66 so that the blades of the two blade holders rotate integrally and with mated cutting edges.
- FIG. 7 shows three blades for each blade unit, as a compromise between cutting speed and manufacturing cost it is also possible to use cutters with a different number of blades.
- connection means between the blades of the cutters 15 or 15' can be provided differently than described schematically or could even be replaced by only electronic synchronization of the rotation of the respective motors.
- the sheets emerging from the cutters can be accumulated in a manner different from that shown in the stacker 18, e.g. by selecting them in larger piles.
- the actual cutting plan can vary depending on which cutting parameter it is intended to favour. For example, it may be preferred to maximize the length of the sheets, even if they are half width, rather than the number of full length but shorter sheets, etc.
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Forests & Forestry (AREA)
- Mechanical Engineering (AREA)
- Wood Science & Technology (AREA)
- Manufacturing & Machinery (AREA)
- Manufacture Of Wood Veneers (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
- Debarking, Splitting, And Disintegration Of Timber (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
Abstract
Description
- Production of wood sheets by transverse cutting performed by special automatic cutters from a continuous sheet of veneer is known. The cutter is usually commanded to cut sheets in preset dimensions or transverse strips to be eliminated because they contain defects of the wood, e.g. holes.
- For example, CH 354890 discloses a transverse cutting apparatus in which cutting means comprises two side-by-side transverse blades. If the sheet is wide, then the two blades are operated simultaneously. If the sheet is narrower than one blade, only one blade is operated.
- With this procedure it is obvious that the waste of material is quite high since it is necessary to cut a transverse strip of material as long as the longitudinal dimension of the defect and as wide as the entire veneer strip even if the transverse width of the defect is very limited. In addition, because of the repeated defects the possibility of obtaining long sheets is compromised.
- Despite said disadvantages, a method of cutting as mentioned above is substantially the only one used at present and the only palliative found in the known art is reuse of the large quantity of transverse strips of scrap for low quality applications or production of chipboard or the like.
- US 3,165,961, representing the closest state of the art and covering the preambles of claims 1 and 2, discloses an apparatus in which the defective strips are cut in half even if the defect is only in one half of the strip. In this way, only a half strip is scrapped, but the other half strip is generally unusefully short.
- The general purpose of the present invention is to obviate the above mentioned shortcomings by supplying a method and a machine for cutting veneer in sheets which would reject defective parts with minimal wood waste.
- In view of said purpose it has been sought to provide in accordance with the present invention a method as claimed in claim 1.
- In addition it has been sought to provide in accordance with said method a sheet cutting station as claimed in claim 2.
- To further clarify the explanation of the innovative principles of the present invention and its advantages as compared with the known art there is described below with the aid of the annexed drawings a possible embodiment as a nonlimiting example applying said principles. In the drawings:-
- FIG. 1 shows a schematic side view of a veneer cutting station provided in accordance with the present invention,
- FIG. 2 shows a plan view of the station of FIG. 1,
- FIG. 3 shows a schematic partially sectioned front view of a cutting part of the station of FIG. 1,
- FIG. 4 shows a schematic partial cross section view of a disengageable joint of the part of FIG. 3,
- FIG. 5 shows a schematic plan view of an example of a cutting sequence performed by the station of FIG. 1,
- FIG. 6 shows a schematic side view partially sectioned along plane of cut VI-VI of FIG. 7 of a possible variant of the station of FIG. 1, and
- FIG. 7 shows a cross section view along line of cut VII-VII of FIG. 6.
- With reference to FIGS. 1 and 2 a cutting station indicated as a whole by
reference number 10 comprises in accordance with the present invention conveyor belts supplying a veneer strip 12 (arriving from veneer cutting machines of known type and hence not shown) in front ofknown systems 13 of detection of specific zones of the strip such as those containing defects. Said defect detection systems can for example comprise telecameras, transparency or reflection sensors or the like, as easily imagined by those skilled in the art, to supply information on the presence and position of defects such as for example holes in the veneer transiting opposite them. Such systems of defect detection of the known art being well known to those skilled in the art they are not described further. - Downstream from said
detection systems 13 are placed means 14 of controlled longitudinal cutting of the veneer and, next, selective transverse cutting means 15. - The
means 14 comprise acircular shear 20 driven to cut the veneer in two parallel strips while themeans 15 comprise, as better seen in FIG. 3, a rotary-blade cutter made up of blade units consisting of twoblades bucking rollers motors - While the
blade 21 is supported at the motor end to rotate without axial sliding, theblade 22 is supported at the end near its own motor by an axially slidingsupport 27. - Axial sliding is controlled by a
double action piston 28 driven hydraulically through theducts hydraulic control unit 29 connected to electronic processing and control means 19. - Between the two
blades clutch 30 having aspring 31, e.g. the Melville type, which usually holds it in engagement of the two blades (blades brought near). Anotherspring 32, weaker than thespring 31, placed in thepiston 28, maintains axial tension of the blades. - FIG. 4 shows schematically an example of an embodiment of the
axial clutch 30. As may be seen in the figure, integral with theblade 21 is a supporting and containingstructure 46 in which is inserted in a sliding manner ashaft 47 integral with theblade 22. Reciprocal rotation between thestructure 46 and theshaft 47 is permitted bybearings 48 and 49. - The
spring 31 pushes between anelement 50 integral with theshaft 47 and anelement 51 rotating with theshaft 47, sliding coaxially thereto and butted axially on thestructure 46 with an interposedbearing 52. - The bearing 48 is of known type permitting mutual axial translation of the parts between which it is placed.
- In this manner is assured firm coaxial alignment of the rotation axles of the
blades spring 31. - Between the
structure 46 and theelement 50 are arranged facing rings withfrontal teeth spring 31. - Thus the axial traction of one of the blades (in this specific case the
blade 22 by means of the piston 28) to permit disengagement and independent rotation. - Referring again to FIGS. 1 and 2, at the outlet of the
cutter 15 are placed selection means 16 selectively sending the cut sheets to anautomatic stacker 18 and to ascrap bin 17. Advantageously the selection means 16 are the vacuum type withtop conveyor belt 33. Selection is performed separately in front of eachblade suckers top belt 33, which deposits it on adouble belt 36 for conveyance to thestacker 18 On the contrary, if the sucker is not operated the corresponding product leaving the cutter falls freely in thescrap bin 17. Said selectors are of the known art and therefore not further described nor shown. - The
stacker 18 can be of any type of the known art. For example, in the figures is shown a stacker comprising atop belt 37 which, by a vacuum method of the type described for theselector 16, conveys the wood sheets to deposit them in piles selected in accordance with the dimensions of the sheets and which form on the vertically movable tables withfull width 38 or halvedwidth 39 for thefull width sheets 41 orhalf width sheets 42 respectively. - All the various parts of the station are controlled and commanded to operate substantially as described below by electronic processing and control means 19, e.g. provided by programmed logics such as a microprocessor of the known art programmed in accordance with the description given below and optionally interconnected to a personal computer or the like.
- Such a device, especially in the light of the following operation description, can readily be imagined by those skilled in the art and therefore is not further described here.
- The
control device 19, in addition to processing the data from the sensor and synchronizing the movements of the various devices, commands coupling or not of the two blades of the transverse cutter depending on requirements. - In particular, if independent operation is necessary, the
device 19 commands thecontrol unit 29 to supply fluid to the piston through theduct 54. In this manner the piston moves theblade 22 axially away from theblade 21, thus disengaging theclutch 30 and permitting the twomotors - To again engage the blades so that they behave substantially as a single blade the
control device 19 first resynchronizes them electronically, putting the motors in step (by means of the signals emitted by their position sensors), so that the blades are rearranged as much as possible with parallel faces, and then commands thecontrol unit 29 to supply thepiston 28 with a fluid counterpressure through theduct 40, thus reconnecting themechanical clutch 30 between the blades. - In use the cutting station described above receives on its
conveyors 11 anunbroken strip 12 of wood veneer. Thesensor 13 scans the veneer in transit beneath it and sends corresponding signals to thecontrol device 19. For each scan of the veneer the possible conditions which can occur are 'no defect', 'defect on the right half of the veneer', 'defect on the left half of the veneer', 'defect on both halves of the veneer'. The distance between the vertical line of the sensor and theshear 14 permits theprocessing system 19 to select the best plan for minimizing wood scrap before the zone involved reaches said shear. - Briefly, on the basis of the data from the sensor and the cuts already performed the system decides whether to start the longitudinal cut or not and whether to perform a transverse cut on the entire width of the veneer or only on one half of it.
- By way of example of the operation of the station described here, FIG. 5 shows schematically a possible cutting situation in which the parts of the veneer to be scrapped are identified by oblique lines.
- Essentially, until the
sensor 13 detects unacceptable defects theblades shear 20 is deactivated so that the station produces full width wood sheets as indicated for example byreference number 41. When thesensor 13 detects defects which require scrapping of the material but affect only half the width of the strip as indicated by 43, the control means 19 activate thelongitudinal shear 20 and remove the defect, commanding theblade - The longitudinal cut can be maintained until a defect free section of wood is detected for a length of veneer sufficient to justify obtaining a full width sheet without creating a preceding half sheet too short. For example, the section of veneer indicated by 44 in FIG. 5 would be acceptable.
- If during the full width transverse cut the sensor detects defects affecting both halves of the veneer, e.g. as indicated at 45, the entire defective strip is removed by a double paired cut of the
blades - Naturally, even in the absence of defects, the
blades device 19 at intervals so as to always obtain sheets, halved or not, of a length not exceeding a preset value. The control system can also be programmed to optimize the positions of the transverse cuts so as not to obtain, as far as possible, sheets shorter than a preset value. - It is now clear that the proposed purposes are achieved, providing a cutting station minimizing wood scrap.
- As another example of embodiment of the invention, FIGS. 6 and 7 show schematically a different transverse cutter 15' usable in place of the
cutter 15. - As may be seen in said figures, the cutter 15' comprises a
shaft 56 on which are supported independently in a rotating manner two blade holder units each with aplurality - Parallel to the
shaft 56 is a buckingroller 61 on which slides theveneer 12. - Each
blade holder motor device 19. - In use the cutting station operates as described above.
- When cuts are to be made on half strips the joint 66 is disengaged and the motors drive the blade holders independently. When a full transverse cut is required, the
device 19 first synchronizes the blades by controlling themotors cutter 15, and then operates the clutch 66 so that the blades of the two blade holders rotate integrally and with mated cutting edges. - Naturally the above description of an embodiment applying the innovative principles of the present invention is given merely by way of example and therefore is not to be taken as a limitation of the patent right claimed here.
- For example, although FIG. 7 shows three blades for each blade unit, as a compromise between cutting speed and manufacturing cost it is also possible to use cutters with a different number of blades.
- In addition the connection means between the blades of the
cutters 15 or 15' can be provided differently than described schematically or could even be replaced by only electronic synchronization of the rotation of the respective motors. - The sheets emerging from the cutters can be accumulated in a manner different from that shown in the
stacker 18, e.g. by selecting them in larger piles. - Lastly, as may readily be imagined by those skilled in the art, the actual cutting plan can vary depending on which cutting parameter it is intended to favour. For example, it may be preferred to maximize the length of the sheets, even if they are half width, rather than the number of full length but shorter sheets, etc.
Claims (22)
- A method for cutting sheets (41, 42) from a continuously fed wood veneer strip (12) comprising the steps of:- cutting full width wood sheets (41, 42), of a length falling within predetermined ranges, from the veneer strip (12), until a specific zone containing a predetermined feature, such as a defect (43), is detected in the veneer strip (12), at which point a longitudinal cutting device (14, 20) is actionable to cut the veneer strip (12) into two half width strips for the length of the specific zone and- subsequently a full width transverse cut, using transverse cutting means (15), is made in the veneer strip (12) ahead (with respect to the direction of feed of the veneer strip 12) of the specific zone containing the predetermined feature and, if the longitudinal cutting device was actuated within the specific zone, joining up with the beginning of a longitudinal cut that divides the veneer strip (12) into two half width strips;- followed by a second full width transverse cut, using the transverse cutting means (15), in the veneer strip (12) behind the specific zone containing the predetermined feature and joining with the end of the longitudinal cut if present, characterised in that;- when determined as necessary by control means (19) the transverse cutting means (15) is capable of performing a transverse cut across only one half of the veneer strip and;- the control means (19) being capable of determining specific zones covering both half widths of the strip (12); such that- in the event that the predetermined feature only affects one half width of the strip, the control means (19) can activate the transverse cutter (15) to make a transverse cut only in the one half width strip containing the specific zone;- in the event that the specific zone containing the predetermined feature covers both halves of the veneer strip (12), then the entire specific zone is removed by a double full width transverse cut without necessarily actuating the longitudinal cutting device (14,20) for the length of the specific zone;- the longitudinal cut once started being maintained until a full width transverse cut is made.
- Station (10) for cutting sheets (41, 42) from a strip of wood veneer (12) continuously fed thereto and comprising in combination transverse (to a feed path for a veneer strip 12) cutting means (15) operated by control means (19) to obtain sheets (41) of a length falling within predetermined ranges, and sensor means (13) for detection of a plurality of specific zones of the strip (12) containing preset features, the control means (19) receiving a control signal from the sensor means (13) for selecting a zone of said plurality and recognising whether the selected zone is either contained within one half width of the strip or lies in both halves, the control means (19) driving the transverse cutting means (15) for cutting the strip transversely upstream and downstream of the selected specific zone and longitudinal cutting means (14) for cutting the strip (12) longitudinally in half, characterized in that the transverse cutting means (15) comprises two blade units (21, 22; 57, 58), each for cutting one half width of the strip (12), the control means (19) operating the blade units either synchronously to make two cuts forming one continuous transverse cut or operating each blade unit independently of the other to only make one cut, the longitudinal cutting means (14) lying between the two blade units (21, 22; 57, 58) in the transverse direction.
- Station in accordance with claim 2 characterized in that the individual blade units (21, 22; 57, 58) are arranged side-by-side on the same line across the strip.
- Station in accordance with claim 3 characterized in that the individual blade units (21, 22; 57, 58) have operating means comprising means of synchronization to perform jointly a continuous cut along the entire width of the strip in such a manner as to also provide complete transverse cut.
- Station in accordance with claim 2 characterized in that the longitudinal cutting means (14) comprise at least one rotary shear (20).
- Station in accordance with claim 2 characterized in that the transverse cuting means (15) has an axle rotating longitudinally.
- Station in accordance with claim 6 characterized in that the cutting means (15) has a rotating blade (21, 22) with axle in a median position and with two opposing edges to rotate between bucking rollers (23, 24), the strip to be cut passing between one bucking roller (24) and said blade (21, 22).
- Station in accordance with claim 2 characterized in that the individual blade units (21, 22; 57, 58) have rotating longitudinal axle.
- Station in accordance with claim 8 characterized in that the blade units have a rotating blade (21, 22) with axle in a median position and with two opposing edges to rotate between bucking rollers (23, 24), the half strip to be cut passing between one bucking roller (24) and said blade (21, 22).
- Station in accordance with claims 4 and 8 characterized in that the synchronization means comprise a mechanical clutch (30, 66) for mutual coupling of the rotation axles of the individual blade units (21, 22; 57, 58).
- Station in accordance with claim 10 characterized in that the mechanical clutch (30) comprises teeth (53, 55) on the facing ends of the individual blade units (21, 22) to engage mutually upon mutual axial approach of the blade units.
- Station in accordance with claim 11 characterized in that the individual blade units are held in mutual nearness by elastic means (31) disengagement means (28) controlled by said control means (19) causing selectively axial withdrawal of the individual blade units against the action of said elastic means.
- Station in accordance with claim 12 characterized in that the disengagement means between two individual blade units comprise a hydraulic piston (28) for movement against the action of a spring (32) placed at one end of one of the two individual blade units.
- Station in accordance with claims 3 and 9 characterized in that the individual blade units have bucking rollers (23, 24, 61) in common.
- Station in accordance with claim 2 characterized in that downstream from the cutting means are placed selector means (16) shunting selectively toward a scrap path (17) or toward an outlet path (36) for cut strip parts.
- Station in accordance with claim 15 characterized in that the selector means (16) comprise a conveyance device with top vacuum belt (33) conveying to said outlet path.
- Station in accordance with claim 15 characterized in that at the end of said outlet path (36) are placed stacker means (18) for stacking wood sheets in separate piles depending on the dimensions of the sheets.
- Station in accordance with claim 6 characterized in that the transverse cutting means (15) has a plurality of blades (59) arranged radially around said longitudinally rotating axle to move sequentially near to a bucking roller (61), the strip to be cut passing between the blade (59) and the roller (61).
- Station in accordance with claim 8 characterized in that the individual blade units have a plurality of blades (59) arranged radially around said longitudinally rotating axle to move sequentially near to a bucking roller (61), the strip to be cut passing between the blade (59) and the roller (61).
- Station in accordance with claims 3 and 19 characterized in that the individual blade units have common bucking rollers (61).
- Station in accordance with claim 10 characterized in that the synchronization means comprise a disengageable mechanical clutch (66) between the shafts of rotation motors of each individual blade unit.
- Station in accordance with claim 21 characterized in that the disengageable mechanical clutch (66) is an electromechanical coupling.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP94201351A EP0627285B1 (en) | 1991-02-12 | 1992-02-10 | Transverse cutting device for wood veneer |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITMI910354 | 1991-02-12 | ||
ITMI910354A IT1249595B (en) | 1991-02-12 | 1991-02-12 | CUTTING STATION IN SHEETS FOR SHEETS OF WOOD |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94201351.7 Division-Into | 1992-02-10 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0500161A2 EP0500161A2 (en) | 1992-08-26 |
EP0500161A3 EP0500161A3 (en) | 1993-02-24 |
EP0500161B1 true EP0500161B1 (en) | 1997-05-02 |
Family
ID=11358533
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94201351A Expired - Lifetime EP0627285B1 (en) | 1991-02-12 | 1992-02-10 | Transverse cutting device for wood veneer |
EP92200356A Expired - Lifetime EP0500161B1 (en) | 1991-02-12 | 1992-02-10 | Sheet cutting station for rotary cut wood veneer |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94201351A Expired - Lifetime EP0627285B1 (en) | 1991-02-12 | 1992-02-10 | Transverse cutting device for wood veneer |
Country Status (5)
Country | Link |
---|---|
EP (2) | EP0627285B1 (en) |
AT (2) | ATE174251T1 (en) |
DE (2) | DE69227842T2 (en) |
ES (2) | ES2127881T3 (en) |
IT (1) | IT1249595B (en) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5562137A (en) * | 1995-05-31 | 1996-10-08 | Capital Machine Company, Inc. | Method and apparatus for retaining a flitch for cutting |
US5694995A (en) * | 1995-05-31 | 1997-12-09 | Capital Machine Company, Inc. | Method and apparatus for preparing a flitch for cutting |
US5868187A (en) | 1995-05-31 | 1999-02-09 | Capital Machine Company, Inc. | Method and apparatus for retaining a flitch for cutting |
US5590700A (en) * | 1995-11-15 | 1997-01-07 | Capital Machine Co., Inc. | Vacuum flitch table with self-cleaning vacuum valve |
US5680887A (en) * | 1995-11-30 | 1997-10-28 | Capital Machine Co., Inc. | Veneer slicer with timing belt |
WO1997032699A1 (en) * | 1996-03-08 | 1997-09-12 | Miller Veneers, Inc. | Method and apparatus for cutting veneer sheets |
US5960104A (en) * | 1996-08-16 | 1999-09-28 | Virginia Polytechnic & State University | Defect detection system for lumber |
WO2005102633A2 (en) | 2004-04-15 | 2005-11-03 | Miller Veneers, Inc. | Method and apparatus for cutting veneer sheets from a flitch |
US9050735B2 (en) | 2006-06-20 | 2015-06-09 | Danzer Services Schweiz Ag | Automatic clipping line |
JP2011513098A (en) * | 2008-03-11 | 2011-04-28 | パダナ アーゲー | Apparatus and method for cross cutting and binding of veneer bundles |
CN102350713B (en) * | 2011-08-01 | 2014-04-02 | 济南德佳机器控股有限公司 | Processing equipment and method for material optimization |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2616501A (en) * | 1947-11-12 | 1952-11-04 | Willis E Smith | Combined veneer clipper and trimmer |
GB692783A (en) * | 1950-02-03 | 1953-06-17 | Marvin Hart | Improvements in the production of wood veneers |
US2928305A (en) * | 1957-01-14 | 1960-03-15 | Prentice Machine Works Inc | Veneer clipper for cutting measured lengths with means responsive to feed of work to regulate the cutting cycle |
CH353890A (en) * | 1957-09-05 | 1961-04-30 | Mueller Ag | Veneer scissors |
US2942635A (en) * | 1959-01-16 | 1960-06-28 | Roy C Horne | Method of reconstituting lumber and product thereof |
US3165961A (en) * | 1962-11-30 | 1965-01-19 | Weyerhaeuser Co | Apparatus for automatically cutting defective veneer sheets |
CH467658A (en) * | 1968-02-02 | 1969-01-31 | Saffa Spa | Clapboard cutter |
US3808925A (en) * | 1973-03-12 | 1974-05-07 | Durand Machine Co Ltd | Rotary veneer clipper |
JPS6246601A (en) * | 1985-08-26 | 1987-02-28 | 橋本電機工業株式会社 | Cross-peeling device for thin long-sized veneer |
IT206331Z2 (en) * | 1985-09-25 | 1987-08-10 | Cremona Angelo & Figlio | PERFECTED ROTARY CUTTER FOR LEAF MATERIALS, IN PARTICULAR SHEETS OF WOOD. |
IT1228658B (en) * | 1989-02-10 | 1991-06-27 | Cremona Angelo & Figlio | DEVICE FOR SECTIONING AND STACKING OF WOODEN RIVETS. |
JP2706332B2 (en) * | 1989-11-10 | 1998-01-28 | 三菱重工業株式会社 | Rotary drum type cutting device |
FI86818C (en) * | 1990-12-28 | 1992-10-26 | Raute Oy | AVSKAERARE |
FI87431C (en) * | 1991-06-26 | 1993-01-11 | Raute Oy | Veneer cutting device |
-
1991
- 1991-02-12 IT ITMI910354A patent/IT1249595B/en active IP Right Grant
-
1992
- 1992-02-10 DE DE69227842T patent/DE69227842T2/en not_active Expired - Fee Related
- 1992-02-10 AT AT94201351T patent/ATE174251T1/en not_active IP Right Cessation
- 1992-02-10 ES ES94201351T patent/ES2127881T3/en not_active Expired - Lifetime
- 1992-02-10 EP EP94201351A patent/EP0627285B1/en not_active Expired - Lifetime
- 1992-02-10 EP EP92200356A patent/EP0500161B1/en not_active Expired - Lifetime
- 1992-02-10 DE DE69219381T patent/DE69219381T2/en not_active Expired - Fee Related
- 1992-02-10 ES ES92200356T patent/ES2101794T3/en not_active Expired - Lifetime
- 1992-02-10 AT AT92200356T patent/ATE152390T1/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
DE69219381D1 (en) | 1997-06-05 |
EP0627285A2 (en) | 1994-12-07 |
EP0627285A3 (en) | 1995-09-06 |
DE69227842D1 (en) | 1999-01-21 |
EP0500161A3 (en) | 1993-02-24 |
ES2101794T3 (en) | 1997-07-16 |
ATE152390T1 (en) | 1997-05-15 |
ATE174251T1 (en) | 1998-12-15 |
DE69227842T2 (en) | 1999-04-29 |
ITMI910354A0 (en) | 1991-02-12 |
IT1249595B (en) | 1995-03-09 |
EP0627285B1 (en) | 1998-12-09 |
EP0500161A2 (en) | 1992-08-26 |
DE69219381T2 (en) | 1997-11-20 |
ITMI910354A1 (en) | 1992-08-12 |
ES2127881T3 (en) | 1999-05-01 |
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