Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
  • B27D—WORKING VENEER OR PLYWOOD
  • B27D5/00—Other working of veneer or plywood specially adapted to veneer or plywood
  • B27D5/006—Trimming, chamfering or bevelling edgings, e.g. lists

Definitions

• the invention relates to a cutting unit for a continuous machine of the type specified in the preamble of claim 1.
• such cutting units are arranged as cross-cut saws on the continuous machines mentioned on longitudinal guides which are parallel to the direction of the workpieces.
• the respective cross-cut saw travels along these guides with the respective continuous workpiece corner at which the end of the edge strip glued onto the side of the narrow workpiece surface facing away is cut off.
• the chop saw is running, the sawing tool is fed transversely to the direction of travel of the workpieces, and after the chop cut has been carried out, the chop saw is returned to its starting position after returning the tool to its starting position so that the next work cycle can be started from here .
• two linear movements overlap in different planes for guiding the sawing tool, the respective straight path in each case having to be traveled in the forward and backward directions.
• the reversal of direction at the ends of the linear traverse paths for the cross-cut saw requires high acceleration forces both when starting off and when braking the unit.
• the support for holding the cross-cut saw with its linear guides represents a cross-support, in which the linear guides lie in superimposed levels. Accordingly, separate drives are required for moving the cross-cut saw in the direction of travel of the workpieces on the one hand and transversely to the direction of travel on the other. It is particularly disadvantageous in the known cross-cut saws that the longitudinal guides arranged parallel to the workpiece passage direction have a considerable length, which can be up to 1 m.
• the invention is therefore based on the object.
• To create cutting unit of the type mentioned which requires a shorter construction length in the direction of throughput of the continuous machine and which enables higher throughput speeds and cycle rates of the workpieces.
• This object is achieved in a cutting unit of the generic type according to the invention by the characterizing features of claim 1.
• the oscillation movement forced on the support which is likewise carried out by the cutting tool, has no acceleration peaks, since there is no reversal of direction with dead centers, as is unavoidable with a linear stroke. Due to the oscillation movement, the support and the parts built on it perform a movement along a circle or an ellipse with every point or point.
• the oscillation movement takes place in a single plane, and a single oscillation drive can be provided for this purpose, the mechanical oscillation being able to be generated in a simple manner by implementing a rotational movement. This enables a high rotational speed along the elliptical or circular oscillation path during a single oscillation period, which corresponds to one working cycle of the cutting unit.
• the support can be stopped exactly in its starting position after each work cycle in order to go through another oscillation period upon a corresponding start signal.
• This discontinuous oscillation operation allows the difference between the duration of one Easily compensate for the work cycle and the time sequence of the continuous interfaces on the workpieces.
• One of the main areas of application of a cutting unit of the type according to the invention is in the cutting station of such through-feed machines, in which the processing of the narrow surface sides of the workpieces comprises the gluing of an edge strip, the protrusions of which have to be cut at the corners of the workpieces located at the front and rear in the direction of travel.
• the new cutting tool is also suitable for other cutting processes that have to be carried out on the narrow surface sides or on the adjacent workpiece surfaces. This can be, for example, cuts in a seal or a piping on which incisions or notches have to be made.
• FIG. 1 is a side view of a cutting unit designed as a cutting unit
• Fig. 2 is a top view of the oscillation drive Cutting unit according to Fig. 1 and
• Fig. 3 is a plan view of the cutting unit of FIG. 1, omitting the lower structures for the oscillation drive.
• a workpiece transport device 1 is schematically shown in Fig. 1, which can be a transport chain, as are common in those continuous machines on which plate-shaped workpieces for the furniture industry or interior design are processed, particularly in the area of the narrow sides of the plate ,
• narrow surface sides 3 which lie with their longitudinal direction in the direction of passage specified by the transport device 1, and the workpieces 2 also have narrow surface sides 4 in the usual square or rectangular configuration transverse to the direction of flow.
• These narrow surface sides 3, 4 are coated in very many cases by means of an edge strip which is applied in an edge banding station of the continuous machine.
• the edge strip protrudes on the narrow surface side in question, here the narrow surface side 3, which lies in the direction of travel of the machine, both on the front of the workpieces 2 in the direction of travel and on the back, and a capping be made to cut the edge strip flush with the narrow surfaces 4 of the workpieces 2, which are transverse to the direction of flow.
• Cutting tool 5 generally have a circular saw blade which is arranged on the motor shaft of a cutting motor 6.
• the cutting tool 5 with the cutting motor 6 is seated on a support 7, which in turn is arranged on an oscillation drive 8.
• the oscillation drive 8 ensures that the support 7 with the parts built on it moves with every point along an elliptical or circular path, the traversing of this circular path between the two vertices, the connecting line of which is parallel to the direction of travel of the workpieces 2, sufficient to carry the cutting tool 5 for the cutting process on a piece of the through path with the workpiece 2 at an adapted speed.
• a superimposed cross stroke is carried out between the two vertices of the oscillation path, the connecting line of which runs transversely to the direction of travel of the workpieces 2.
• This cross stroke is matched to the necessary depth of cut, which must be provided for cutting through the respective edge material.
• the oscillation drive 8 has a positionable drive motor 9, which is necessary because the cutting tool 5 depends on the work cycle the oscillation path should only be traversed once.
• the motor 9 drives a drive gear 10, which is arranged with an upright axis between two turntables 11, which have a toothing 14 along their circumference with which the drive gear 10 meshes, which can be seen particularly clearly from FIG. 2.
• the turntables 11 have projecting drivers 12 in the form of eccentric bolts on their upper sides, both drivers 12 having the same eccentricity, the two turntables 11 being the same and being driven synchronously with the same direction of rotation by the motor 9 and the drive gear 10. The angular position of the two drivers 12 relative to the axis of rotation of the turntable 11 is always the same.
• the support 7 has a lower platen 13 which has receptacles 20 on the underside for a play-free, rotating receptacle for the drivers 12 of the driver disks 11.
• the cutting tool 5 may be necessary to support the cutting tool 5 together with its cutting motor 6 on the front transverse side 4 of the workpiece during the cutting process.
• the oscillation movement is delayed during the cutting process so that the cutting tool 5 is carried along by the workpiece.
• the corresponding compensation takes place by displacing the cutting tool 5 with the cutting motor 6 and the support plate 15 against a pressure element 18, such as a pneumatic cylinder or a spring, which is arranged on a support arm 17 which is fixedly arranged on the mounting plate 13.
• a pushbutton 19 is movably arranged on the support plate 15 in such a way that it can be retracted into and withdrawn from the passage area of the relevant workpiece transverse side 4 without being compliant in the direction of passage of the workpieces, so that it acts against the force of the pressure element 18 delayed oscillation drive 8 can shift the cutting tool 5 relative to it.
• the oscillation drive 8 can be accelerated in relation to the throughput speed of the workpieces 2, so that a support in an analogous manner on the in Direction of movement of the rear transverse workpiece side 4 can take place in order to achieve a defined position of the cutting tool 5 relative to the relevant transverse workpiece side 4, with which the edge strip is to be cut flush, during the cutting operation.
• the cutting unit shown in FIG. 1 is supplemented in the cross-cutting machine by a mirror-symmetrically constructed and arranged cutting unit in order to be able to cut the protruding ends of the edge strip at both ends of the coated workpiece narrow surface side 3.
• the cutting tool 5 with the cutting motor 6 is arranged on a carrier plate 16, which can be pivoted relative to the support plate 15.
• the pivot path is predetermined by a link 21, which can be incorporated in one of the two plates 15, 16 and in which the other plate 16, 15 engages with a protruding cam or the like, as can be seen in FIG. 3.

Landscapes

• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Wood Science & Technology (AREA)
• Forests & Forestry (AREA)
• Sawing (AREA)
• Milling, Drilling, And Turning Of Wood (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (2)

Family

ID=7685168

Family Applications (1)

Country Status (4)

Families Citing this family (8)

Family Cites Families (9)

• 2001
  • 2001-05-16 DE DE2001124081 patent/DE10124081C1/de not_active Expired - Fee Related
• 2002
  • 2002-05-02 WO PCT/EP2002/004816 patent/WO2002092268A2/de active IP Right Grant
  • 2002-05-02 ES ES02753037T patent/ES2312602T3/es not_active Expired - Lifetime
  • 2002-05-02 EP EP02753037A patent/EP1419026B1/de not_active Expired - Lifetime
  • 2002-05-02 DE DE50212843T patent/DE50212843D1/de not_active Expired - Lifetime

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