FR3093455A1 - Sawing device - Google Patents

Abstract

The present invention relates to a sawing device (1) of the type comprising a receiving table (3) of pieces to be cut (2) comprising a backrest (16) perpendicular to the plane of the table (3) which is provided with a plane of 'support (16a) intended to receive an edge of said pieces to be cut (2), a sawing guide (27) inside which a circular saw (31) is mounted movably in translation, this sawing guide (27) being mounted movably in rotation around a guide tube (17) perpendicular to the receiving table. This sawing device is characterized in that it comprises means for vertical displacement of the sawing guide (27) and / or of the receiving table (3) capable of applying the base of the sawing guide (27) against the upper part. backrest (16) and against the upper surface of the workpiece (2). (Figure for the abstract: Fig. 1)

Description

Sawing device

The present invention relates to a device for sawing, in particular flat elements, capable of making longitudinal and transverse cuts as well as inclined cuts, and ensuring during these a maintenance of these elements.

Known, in particular from US Patent 2,630,146, is a cutting device for portable circular saws which are slidably mounted on a cutting guide which is mounted to pivot around a vertical axis extending above this guide. so that it can rest on the part to be cut during the cut.

Such a cutting device has significant drawbacks and in particular that of not allowing the cutting plane of the saw blade to cross the axis of rotation of the cutting guide so that, when the user makes two successive cuts inclined on either side of an axis perpendicular to the longitudinal axis of the part to be cut, these cuts are made far from each other so that the user who wishes not to waste a large part of material is forced to move it longitudinally to compensate for such a shift.

Risk of instability of the part when it is a thickness lower than that of the file, which presents a gap between the upper face of the part to be cut and the lower face of the guide

The present invention proposes to remedy these drawbacks by proposing a cutting device in which the two previously mentioned cutouts are adjacent, thus keeping the piece to be cut tight between the support and against the lower surface of the sawing guide.

The subject of the present invention is thus a sawing device of the type comprising a receiving table for pieces to be cut comprising a backrest perpendicular to the plane of the table provided with a support plane intended to receive an edge of said pieces to be cut, a guide sawing machine inside which a circular saw is mounted movable in translation, this sawing guide being mounted movable in rotation around a guide tube perpendicular to the receiving table, this sawing device is characterized in that it comprises means for vertical displacement of the sawing guide and/or of the receiving table able to apply the base of the sawing guide against the upper part of the backrest and against the upper surface of the piece to be cut.

According to the invention, the guide tube may be arranged at a lower level than that of the sawing guide and the axis of the guide tube may be located in the support plane of the backrest.

The sawing guide may be movable in rotation about an axis integral with the backrest and parallel to the receiving table, this axis of rotation may be maintained by support means which will be integral in vertical translation with the backrest.

Furthermore, the backrest may be movable in vertical translation along an axis perpendicular to the receiving table, furthermore the backrest may be integral with holding elements which will be slidably mounted in vertical supports.

The holding elements may comprise weight compensation elements which may in particular consist of compression springs which will be arranged between the lower part of the holding elements and the ground.

The circular saw will preferably be placed on a plate which will be able to slide in the sawing guide, moreover this plate may be able to be placed in such a way that the plane of the saw blade is placed perpendicular to the sawing guide. , or along the longitudinal axis thereof.

The table may include beams which will preferably be parallel to the backrest, these beams may include means capable of receiving support wedges for the part to be cut.

The receiving table may consist of a frame formed of tubular elements and the beams may be provided at each of their ends with two wings arranged in their longitudinal extension and the opposite tubular elements of the frame may comprise on their internal face notches suitable to receive the wings.

The beams may include means capable of receiving support wedges for the part to be cut and the upper face of the latter may be pierced with vertical holes capable of receiving studs made at the base of support wedges for the part to be cut.

The sawing device according to the invention may comprise means capable of maintaining the base of the sawing guide at a distance from the table equal to the thickness of the part to be cut.

This table may include holding means capable of making it movable in vertical translation, it may be held by at least three holding jacks which will be adjustable in height in a synchronized manner.

Each of these cylinders may include a screw placed in a vertical hole in the feet onto which a toothed wheel will be screwed, the latter being immobilized in translation relative to the feet and a notched flexible element, in particular a belt, will engage with each of these notched wheels.

Finally, the sawing device according to the invention may comprise means for immobilizing the sawing guide relative to the receiving table comprising a slider able to move relative to said table and to be immobilized with the latter, this slider being provided with removable fastening means with the sawing guide.

There will be described below, by way of non-limiting example, embodiments of the present invention, with reference to the appended drawing in which:

Figure 1 is a perspective view of a sawing device according to the invention shown in cross-sectional position,

Figure 2 is a perspective view of the front structure of the sawing device according to the invention shown in Figures 1

Figure 3 is a view of the front structure and the cutting guide of the sawing device according to the invention shown in Figures 1 and 2,

Figure 4 is a schematic view in partial cross section of the sawing device shown in the previous figures,

FIG. 5 is a partial perspective view of an embodiment of the sawing device according to the invention,

Figure 6 is a partial cross-sectional schematic view of another embodiment of the invention,

Figure 7 is a schematic partial sectional view of a detail of a method of fixing the sawing guide and the saw holder plate of the sawing device according to the invention,

FIG. 8 is a perspective view of an embodiment of a sawing device according to the invention with vertical displacement of a cutting table,

Figure 9 is a schematic sectional view of a cylinder for vertical movement of the cutting table.

Figure 10 is a partial perspective view of the sawing device shown in Figure 1,

Figure 11 is a horizontal sectional view of the fixing device shown in Figure 7, along line VII-VII respectively in the fixing and non-fixing position of the sawing guide,

Figure 12 is a horizontal sectional view of the fixing device shown in Figure 7, along line VII-VII respectively in the fixing and non-fixing position of the sawing guide,

There is shown in Figures 1 to 2 a sawing device 1 according to the invention which is intended to ensure the cutting of a wooden board 2. This device essentially comprises a horizontal tubular support structure 3 forming a cutting table which is maintained at a distance from the ground capable of allowing easy work by a user, on the one hand by means of two vertical feet 5 of square-shaped cross section, which are arranged on a side, called rear, of this structure and, on the other hand, 'on the other hand, by a flat metal front face 6 which ends at its base in a profile 6a of U-shaped cross section and a vertical front structure 7 which will be described below.

The horizontal tubular support structure 3, which is rectangular in shape, is formed of four tubes of square cross section, namely a rear tube 9a, a front tube 9b, two side tubes 9c and the front face 6. It also comprises side members longitudinal 10 which are intended to receive the piece to be cut 2.

The front structure 7 comprises four coplanar vertical tubular columns 11 inside which are slidably mounted four feet 13 which are biased upwards by respective compression springs 15 which are housed in the base of the columns 11. The four columns 11 are fixed by their respective bases to a longitudinal metal profile 12 with a U-shaped cross-section which is secured to the profile 6a. The upper part of the feet 13 is secured for its part to a longitudinal crosspiece with a cross section in the shape of an inverted U, the rear wing of which extends downwards and which forms a backrest 16.

Under these conditions, it is understood that the backrest 16 is capable of sliding vertically between the front face 6 and the columns 11. It will also be noted that the backrest 16 comprises a vertical face 16a, referred to below as the support plane, against which the user will apply the edge of part 2 to be cut when cutting.

A vertical cylindrical guide tube 17 with a vertical axis uu', the base of which is fixed to the profile 12, is placed in the center of the front structure 7.

The two horizontal arms 22a of a fork 22 are slidably and rotatably mounted on this guide tube 17, this fork terminating in a vertical arm 22b whose upper end is integral with a yoke 23 provided with two flanges of maintenance 25.

The fork 22 is traversed by a horizontal upright 19 which is connected by two vertical uprights 19a, arranged at its ends, to the backrest 16. A sector 21 provided with graduations 21a is fixed to the backrest 16 and its center is located on the axis uu 'of the guide tube 17. It is understood, under these conditions, that the vertical arm 22b and the yoke 23 are able to pivot from one side to the other of the front structure 7 around the guide tube 17 of axis uu'.

A sawing guide 27 consisting of a rectangular tubular frame is mounted articulated in rotation in the yoke 23 between the two wings 25 thereof around a horizontal axis 24 of direction xx' perpendicular to the latter.

As shown in Figures 1 and 7, the sawing guide 27 receives a plate 29 which is slidably mounted in a groove 28 dug in the uprights 27a forming this frame and on which is fixed a circular saw 31 provided with a blade 31a, as shown in Figures 1 and 3. The plate 29 is provided with means capable of enabling it to occupy two positions, namely a transverse sawing position as shown in Figure 1, and a longitudinal sawing position perpendicular to it.

The sawing guide 27 is provided with an index 33 which, in cooperation with the graduations 21a of the sector 21, allows the user to know the angle formed by the sawing guide 27 with the direction of the longitudinal axis yy 'of the horizontal support structure 3, and consequently, the angle formed by the sawing plane with this axis.

As shown in Figure 1, the sawing device makes it possible, by moving the plate 29 in the sawing guide 27, to make cutouts of material, in particular wood, which are perpendicular to the longitudinal axis yy' of the structure. bracket 3.

According to the present invention, it is possible to easily make cutouts forming different angles with the longitudinal axis yy', as shown in FIG. 3, in which, for reasons of clarity of the figures, the front structure has simply been shown 7 and the sawing guide 27. To do this, the fork 22 has been rotated around the guide tube 17 until the index 33 indicates on the graduations 21a of the sector 21 the desired value of the cutting angle with respect to the longitudinal axis yy' of the support structure 3.

The present invention is particularly advantageous in that it makes it possible, during the cutting operation, to rest the sawing guide 27 on the piece of wood to be cut, which, on the one hand, provides good precision of cutting and, on the other hand, ensures a good maintenance of the latter.

Indeed, as shown in Figure 4, when the user wishes to carry out a sawing operation, he begins by raising, at least partially, the sawing guide 27 then he places the cutting board 2 on the beams 10, ensuring that that one edge of the latter comes into contact with the support surface 16a of the backrest 16. He then returns the sawing guide 27 to the horizontal position, and the springs 15 exert on the backrest 16 a vertical force F which is opposes the weight P of the front structure 7 and of the sawing guide and applies the upper face of the backrest 16 against the base of the sawing guide 27. Thus the latter is applied both against the respective upper faces of the piece to be cut 2 and file 16.

Note a first arrangement of the invention according to which the guide tube 17 of axis uu' around which the rotation of the sawing guide 27 takes place is arranged at a lower level than that of this sawing guide. Such an arrangement is particularly advantageous in that it makes it possible to clear the upper part of the sawing guide, thus allowing the saw blade 31a to have a stroke allowing it to go beyond the axis of rotation uu' .

It will also be noted a second arrangement of the invention according to which the axis uu' of the guide tube 17 is located in the support plane 16a of the backrest 16. Such an arrangement is particularly advantageous in that it allows the plane to section of the saw blade 31a, during the rotation of the sawing guide 27 around the axis uu', to always pass through this axis regardless of the angle of rotation of the sawing guide 27, as shown in the Figure 3a.

These two arrangements thus make it possible, when a user makes successive cuts inclined on either side of an axis perpendicular to the longitudinal axis of a part to be cut, to make these in adjacent positions which avoids, as in the devices of the prior state of the art, being forced to move the piece to be cut longitudinally if it wishes to avoid a waste of material.

The sawing device according to the invention comprises means making it possible to immobilize the sawing guide 27 with respect to the support structure 3. These means, as shown in FIGS. 1, 7, 11, and 12, consist of a slider 26 adapted to move by sliding on the tubes 9a and 9c and to be immobilized on the latter by means of a screw 26a passing through the slider 26 and coming to rest on the tubes 9a and 9c.

This slider 26 is traversed vertically by a locking rod 30 which is slidably mounted in a bore 26b of the slider 26 and whose upper part ends in a head 30a whose width h is close to the diameter of the rod 30 and the length H is greater than this. The rod 30 is controlled in rotation about its vertical axis zz' by a member 30b and can be locked in rotation and translation by a screw 32 which is screwed into the slider 26 and comes to rest on the latter.

The base of the tubular sections 27a of the sawing guide 27 is split with a groove 36 slightly greater than the diameter of the rod 30 so that, in one position of the latter, as shown in FIG. 12, the head 30a can penetrate through this groove 36 inside the profile. After a 90° rotation of the rod 30, the head 30a then comes to bear against the lower internal wall of the profile 27a, as shown in FIGS. 7 and 11, and can be locked in this position by the screw 32 which has the effect of ensuring the maintenance of the sawing guide 27 relative to the support structure 3 or table.

In an alternative implementation of the present invention, and as shown in Figures 1 and 5 the beams 10 are provided at each of their ends with two wings 10a arranged in their longitudinal extension, and the uprights 9c have on their face internal notches 8 of the same width. These notches 8 are spaced apart so that they can receive the wings 10a, which makes it possible to arrange the longitudinal members 10 in various lateral positions depending on the arrangement of the saw cuts that the operator wishes to make on the board 2.

Furthermore, the beams 10 can be provided, from their upper face, with vertical holes 14 which are intended to receive studs 18 made at the base of wedges 20. The latter are intended to receive the board 2 to be cut, as well as shown in Figure 6. Such a mode of implementation makes it possible to position the wedges 20 according to the position of the saw cut on the board which is itself a function of the angle of inclination of the sawing guide with respect to to the longitudinal axis of the support structure 3, as indicated by the vernier 33.

Of course, according to the invention, the relative displacement of the sawing guide 27 with respect to the cutting board 2 can also be achieved by keeping the backrest 16 fixed and by causing the support of the board 2 to move.

There is shown in Figures 8 and 9 such a variant implementation of the invention in which the front columns 11 'are of fixed height and maintain a backrest 16' which is thus at a fixed distance from the ground. The support structure comprises two front legs 5' which are of the same height as the rear legs 5 and which maintain a cutting table 34. The upper part of each of these legs 5 and 5' includes a screw 38 whose height is adjustable by means of a control mechanism.

As shown in Figure 9 each of these four control mechanisms consists of a threaded rod 35 which takes place in a longitudinal bore 35a of the foot 5, 5 'and on which is screwed a toothed wheel 37 which is housed in a chamber 39. A toothed belt 41 which goes all the way around the horizontal structure 3 is engaged with each of the four toothed wheels 37. It is understood that a movement of the toothed belt 41 parallel to the cutting table 34 in one direction or in the other along the arrows C, causes the rotation of the four toothed wheels 37 which, themselves cause the vertical displacement of the threaded rod 35 and the subsequent displacement in height of the cutting table 34.

To carry out the movement of the toothed belt 41, use may be made of any suitable mechanism or, more simply, of manual means constituted as shown in FIG. 8, by a handle 43 intended to be taken in hand by the user which comprises a recess 43a able to engage in the grooves of the toothed belt 41.

Of course, the sawing device according to the invention makes it possible to place the saw plate 29 in a position in which the saw blade 31a is parallel to the side members 10, which makes it possible to cut very long panels.

Claims (20)

Sawing device (1) of the type comprising a receiving table (3,34) of pieces to be cut (2) comprising a backrest (16) perpendicular to the plane of the table (3) which is provided with a support plane ( 16a) intended to receive an edge of said pieces to be cut (2), a sawing guide (27) inside which a circular saw (31) is mounted mobile in translation, this sawing guide (27) being mounted mobile in rotation around a guide tube (17) perpendicular to the receiving table, characterized in that it comprises means for vertical displacement of the sawing guide (27) and / or of the receiving table (3,34) capable of apply the base of the saw guide (27) against the upper part of the backrest (16) and against the upper surface of the workpiece (2). Sawing device according to Claim 1, characterized in that the guide tube (17) is arranged at a level lower than that of the saw guide (27). Sawing device according to any one of claims 1 or 2, characterized in that the axis (uu ’) of the guide tube (27) is located in the support plane (16a) of the backrest (16). Sawing device according to any one of the preceding claims, characterized in that the sawing guide (27) is movable in rotation about an axis (24) integral with the backrest (16) and parallel to the receiving table (3,34 ). Sawing device according to Claim 4, characterized in that the axis of rotation (24) is maintained by support means (25) which are integral in vertical translation with the backrest (16). Sawing device according to any one of the preceding claims, characterized in that the backrest (16) is movable in vertical translation along an axis (uu ’) perpendicular to the receiving table (3, 34). Sawing device according to Claim 6, characterized in that the backrest (16) is integral with retaining elements (13) mounted to slide in vertical supports (11). Sawing device according to Claim 7, characterized in that the retaining elements (13) comprise weight compensation elements (15). Sawing device according to Claim 8, characterized in that the weight compensation elements consist of compression springs (15) arranged between the lower part of the retaining elements (13) and the ground. Sawing device according to any one of the preceding claims, characterized in that the circular saw (31) is arranged on a plate (29) capable of sliding in the sawing guide (27). Sawing device according to Claim 10, characterized in that the plate (29) is adapted to be arranged such that the blade plane of the saw (31a) can be arranged perpendicular to the saw guide (27), or along the longitudinal axis thereof. Sawing device according to any one of the preceding claims, characterized in that the receiving table (3) comprises longitudinal members (10) parallel to the backrest (16). Sawing device according to Claim 12, characterized in that the receiving table (3) consists of a frame formed of tubular elements and the longitudinal members (10) are provided, at each of their ends, with two wings (10a) arranged in their longitudinal extension and opposed tubular elements (9c) of the frame have on their internal face notches (8) capable of receiving the wings (10a). Sawing device according to any one of Claims 12 or 13, characterized in that the longitudinal members (10) comprise means (14) adapted to receive support blocks (20) for the piece to be cut (2). Sawing device according to Claim 14, characterized in that the upper face of the longitudinal members (10) is pierced with vertical holes (14) suitable for receiving studs (18) produced at the base of support wedges (20) of the piece to be cut. (2). Sawing device according to any one of the preceding claims, characterized in that it comprises means suitable for maintaining the base of the sawing guide (27) at a distance from the table (3) equal to the thickness of the piece to be cut (2). Sawing device according to any one of the preceding claims, characterized in that the receiving table (34) comprises holding means (38) capable of making it mobile in vertical translation. Sawing device according to Claim 17, characterized in that the table (3) is held by at least three holding jacks (38) which are adjustable in height in a synchronized manner. Sawing device according to Claim 18, characterized in that each of the jacks (38) comprises a screw (35) arranged in a vertical hole (35a) of the feet (5, 5 ') on which a toothed wheel (37) is screwed, the latter being immobilized in translation with respect to the feet (5, 5 ') and a flexible notched element (41), in particular a belt, is engaged with each of the notched wheels (37). Sawing device according to any one of the preceding claims, characterized in that it comprises means (26a) for immobilizing the sawing guide (27) with respect to the receiving table (3) comprising a slide (26) capable of move relative to said table (3) and to be immobilized therewith, this slide being provided with removable fixing means (30, 30a, 32) with the saw guide (27).