FR2688160A1 - MACHINING DEVICE FOR WOOD WORKING MACHINE AND MACHINE COMPRISING SUCH A DEVICE. - Google Patents

Abstract

The machining device (17) for a woodworking machine comprises a tool-holder spindle (14), mounted in rotation, on which are engaged a tool (11) having a machining surface of revolution about the axis of the spindle (14), this surface being intended to machine one of the faces of an elongated piece of wood (15), and a second tool (12) in contact with the first tool (11) and having a surface of revolution shaped to machine a face perpendicular to the aforementioned face and at the same time as the latter. Use in particular for machine to machine the four faces of the same piece of wood.

Description

The present invention relates to a machining device for a machine for

  work with wood or similar material in the form of elongated pieces

example of rectangular section.

  The invention aims in particular to improve machining in a single pass of two or more faces

of the same piece of wood.

  In known woodworking machines, especially in the groomers, the rough pieces of wood are moved in front of a rotary machining tool that works

one of the faces of the piece of wood.

  To machine the other faces, it is necessary to make successive passes in front of the tool, after turning the piece of wood, or to pass successively in front of other rotating tools arranged

on the same machine.

  The conventional device for machining a face of a piece of wood or similar material is composed of a tool spindle mounted in rotation, on which is engaged a tool having a surface

  Revolution machining around the axis of the spindle.

  The object of the present invention is to create a machining device of the pieces of wood for machining simultaneously at least two faces

  perpendicular to a piece of wood.

  The device according to the invention consists in mounting on the tool spindle, comprising a first tool having a machining surface of revolution about the axis of the spindle, a second tool in contact with the first tool and having a surface of revolution machining The machining surface of the second tool is shaped to machine a face perpendicular to the face

machined by the first tool.

  The device according to the invention therefore has the advantage of machining two faces simultaneously.

  perpendicular to the same elongated piece of wood.

  The invention thus makes it possible to save time

  substantial for the machining of pieces of wood.

  The device according to the invention allows

  halving the number of pins

  tools used in the conventional process for the machining of two perpendicular faces It thus presents an economic interest by reducing on the same machine the

number of rotating pins.

  According to a preferred version of the invention, the first tool engaged on the tool-holder spindle is of generally cylindrical shape, whose axis coincides with that of the spindle, and the second tool has a general shape of milling cutter whose diameter is greater than that of the first tool The device thus simultaneously allows the horizontal dressing or planing of a face and the vertical dressing of another face

perpendicular to the first.

  An advantageous version of the device is obtained with a cutting cutter, comprising on its side opposite to the first tool, shredding teeth arranged on a surface of revolution coaxial with said cutter Such a shredder transforms the overthickness of

wood cut into chips.

  According to another version of the invention, the first and second tools have a generally conical machining surface whose vertices are substantially merged, the two surfaces form between them an angle substantially equal to 900 This device simultaneously allows the alignment two perpendicular faces of the same piece of wood, plus

  particularly of substantially square section.

  The invention also relates to a machine for the implementation of this device which comprises two machining devices according to the invention whose pins are spaced apart from each other, the position of the two tools on one pin being reversed from their position on the other pin The machine according to

  the invention involves only two pins

  tools in rotation, allows to machine in one

  pass the four sides of the same piece of wood.

  Other peculiarities and advantages of

  the invention will become apparent in the description below.

  after. In the accompanying drawings given by way of non-limiting example: Figure 1 is a schematic view of a device according to the invention and a piece of wood machined by this device; Figure 2 is a side view of the device according to Figure 1; Figure 3 is a perspective view of a first mode of association according to the invention of two tools; Figure 4 is a perspective view of a second mode of association according to the invention of two tools; Figure 5 is a perspective view of a third mode of association according to the invention of two tools and a shredder; Figure 6 is a schematic view of a machine according to the invention, comprising two machining devices; Figure 7 is a side view of the two devices of Figure 6; FIGS. 8A, 8B, 8C are cross-sectional views of a piece of wood respectively before machining, after machining by the first device according to the invention and after machining by the second device according to the invention; FIG. 9 is a schematic view of two conically shaped machining surface tools mounted on

the same axis.

  A will now be described the device according to the invention applied to the realization of a machine to machine simultaneously two or four sides of the same piece of wood of rectangular section, more particularly to the realization of a machine to plan two faces and to erect the other two faces,

commonly called groomer.

  The device 17 according to the invention, represented in FIG. 1, consists of a tool spindle 14 that can be rotated, on which two tools Il and 12 are coupled and tightened.

  axially on the tool spindle 14 by a nut 16.

  The device 17 thus makes it possible to simultaneously machine two perpendicular faces 18 and 20 of the same piece of wood 15 of rectangular section. The first tool 11 makes it possible to carry out the horizontal dressing of the lower face 18 of the piece of wood 15, as shown 2 and the second tool 12 makes it possible to carry out the vertical dressing of a perpendicular face 20 to the lower face 18 of the

piece of wood 15.

  The coupling of the first tool 11 and the second tool 12 engaged on the tool spindle 14 can be achieved by simply tightening by means of a nut 16. This clamping is sufficient for the machining tools 11 and 12 to be integral in rotation. , the cutting force being

  not important considering the tenderness of the material to be machined.

  The tools 11 and 12 can also be made integral with one another by a

  axial interlocking system or by means of screws.

  The first tool 11 A of cylindrical general shape, whose diameter is equal for example to about mm, may comprise, according to Figure 3, a series of projecting blades 30 extending along the generatrices of the cylinder whose axis is coincident with the axis of the tool spindle 14 The blades 30 are

  sharpened and made of hardened steel.

  The tool 11 B (see FIG. 4) can also consist of a series of protruding carbide knives 32 that are offset relative to each other. The staggered arrangement of the knives 32 makes it possible to reduce the sound level during the machining by avoiding sudden compressions-decompressions of the air between

  the blades and the surface to be machined, sources of hissing.

  The tool li C according to FIG. 5 also makes it possible to reduce the noise during the machining by virtue of the arrangement of the carbide teeth 34 along a helix coaxial with the cylinder of the tool li C. In the case of the embodiment according to FIG. 3, the second tool 12A mounted on the tool spindle 14 is a cutting bit, for example with a diameter of about 280 mm and a width adapted to the extra thickness

of wood to be eliminated.

  The cutter 12 A may comprise soldered pellets 31 made of hardened steel or carbide arranged radially in notches 31 has regularly distributed

on the circumference of the strawberry.

  In the example of Figure 4, the cutter 12 B

door knives 33 carbide.

  In the case of Figure 5, the second tool 12 C is associated with a shredder 13 placed on its side opposite to the first tool li C shredder teeth 35 of the shredder 13 are arranged on a surface of revolution 36 coaxial with the cutter 12 These shredding teeth 35 make it possible to chip the wood strip cut by the mill 12 C. The machine according to the invention, shown schematically in FIGS. 6 and 7, comprises two devices 17, 17 A, the position of the tools. 11 and 12 on one of the tool pins 14 being inverted with respect to their position on the other pin 14 The two devices 17, 17 A arranged in parallel, are offset in the direction of movement F of the piece of wood

on the machine.

  One of the devices 17 A, placed downstream with respect to the other device 17 in the direction of advance of the workpiece 15, can be adjusted along a vertical axis in order to modify the thickness of the piece of machined wood and along a horizontal axis to change the

width of the piece of wood 15.

  The machine shown in FIGS. 6 and 7 thus enables the four faces of a piece of wood to be machined simultaneously in a single pass. The piece of rough sawn wood, represented in FIG. 8A, is introduced into the machine. resting on its horizontal guide table and is machined on two sides

  perpendicular 18 and 20 by the first device 17.

  The piece of wood 15 partly machined, according to Figure 8 B, is then machined by the second device 17 A on the other two faces 19 and 21 The piece of wood 15 is machined on its four sides, as shown by the

Figure 8 C, in a single pass.

  The machine according to the invention therefore considerably reduces the number of manipulations required for the machining of four faces of the same piece of wood. It therefore makes it possible to facilitate the work of the manipulator and to save a considerable amount of time during the operation. machining and thereby reduce machining costs. The invention also makes it possible to simplify

  considerably reduce the cost of the machine.

  Of course, the invention is not limited to the embodiment that has just been described and can be made to it many changes without

depart from the scope of the invention.

  It can thus be arranged on a spindle

  two tool tools 25 of conical shape, shown in Figure 9, whose vertices 25 are substantially merged, the two machining surfaces forming between them an angle substantially equal to 900 C. This device allows to machine simultaneously two perpendicular faces of a piece of wood 26 By using two devices such as that shown in Figure 9, suitably arranged relative to each other on the machine, it is possible to machine simultaneously the

  four faces of the same piece of wood.

  Of course, one or both tools of the same machining device could be adapted to machine a face in a non-planar, but profiled manner, for

  make moldings or ribs.

  Moreover, the two pins 14 of the two tools shown in FIGS. 6 and 7 could be nonparallel to each other, which would make it possible to machine

  pieces of wood following a trapezoidal section.

Claims (8)

  1 machining device (17) for a woodworking machine, comprising a tool spindle (14) rotatably mounted on which is engaged a tool (11) having a machining surface of revolution about the axis of the spindle (14), said surface being for machining one of the faces of an elongated piece of wood (15), characterized in that the tool spindle (14) further comprises a second tool (12) made of contact with the first tool (11) and having a surface of revolution shaped to machine a perpendicular face   to the aforementioned face and at the same time as this one.   2 Device (17) according to claim 1, characterized in that the first tool (IA) has a generally cylindrical shape whose axis coincides with that of the spindle (14) and the second tool (12 A) has the general shape of a strawberry whose diameter is greater than that of said cylinder.   3 Device (17) according to claim 2, characterized in that the cylinder of the first tool (li) has blades (30) projecting, extending according to generatrices of said cylinder.   4 Device (17) according to claim 2, characterized in that the cylinder of the first tool (11 B) carries a series of knives (32) projecting staggered one to another.   Device (17) according to claim 2, characterized in that the cylinder of the first tool (11 C) carries a series of teeth (34) arranged in a coaxial helix to said cylinder.   6 Device (17) according to one of the   Claims 2 to 5, characterized in that said strawberry   (12 A, 12 B) is a cutting cutter.   7 Device (17) according to claim 6, characterized in that the cutter (12 C) has on its side opposite to the first tool (11 C), shredding teeth (35) arranged on a surface of revolution   (36) coaxial with said mill (12 C).   8 Device (17) according to claim 1, characterized in that the first and second tools (25) have a generally conical machining surface whose vertices (25 a) are substantially merged, the two surfaces forming between them an angle (a) substantially equal to 900.   9 Woodworking machine comprising two machining devices (17, 17 A) according to one of the   Claims 1 to 8, characterized in that the pins   (14) of the two devices (17, 17 A) are spaced from one another, the position of the two tools (11) and (12) on one of the pins (14) being reversed with respect to their position on the other pin (14), so that the assembly formed by the two pairs of tools (11) and (12) can simultaneously machine the four faces of a same piece of wood (15).   Machine according to claim 9, characterized in that the two pins (14) are parallel.