FR2850057A1 - Wood pieces sawing machine for wooden bracket manufacturing, has rotational drive unit driving pieces towards saw and recipient with adjustable stop plate to regulate length of fitting of piece in its recipient - Google Patents

Abstract

The machine has a saw attached to a conveyor with rotational drive unit driving the pieces (P) to be sawed in loops towards the saw. The drive unit for the pieces has a recipient (520) to receive the pieces, where recipient is provided with a stop plate (550) of adjustable type to regulate the length of the fitting (L) of the piece in its recipient.

Description

The present invention relates to a machine for sawing parts comprising

  a saw coupled to a conveyor comprising rotational drive means able to circulate in loops drive means of the workpieces to be sawed towards the saw. The sawing machine of the invention is suitable, in particular, for the manufacture of wooden battens.

  It is known to continuously saw pieces, such as pieces of wood, to use a machine comprising a saw, for example a circular saw, coupled to a motorized conveyor for feeding pieces of wood. The conveyor is, for example, of the endless chain type. It may consist of two rollers arranged in parallel and around which chains carrying supports can circulate.

  Pieces of wood are then continuously deposited in these supports and are brought in the direction of the saw to saw them. The sawn free end can be recovered, for example, in a bin while the sawn piece of wood continues to be brought into its support until it goes around one of the rollers. The 1 5 piece of sawn wood then falls, by gravity, to the ground to form a heap.

  It appeared interesting to the inventor to seek to design a machine for sawing pieces, such as pieces of wood, which can saw, continuously, said pieces of wood according to different lengths, for example, to reduce the length of the sawn free ends which very often constitute a scrap or else to assign the sawn pieces of wood to a particular use.

  It also appeared interesting to the inventor to seek to design such a machine for sawing pieces of wood which can also sort by length classes the sawn pieces of wood.

  Certain sawing machines of the aforementioned type have been perfected in an attempt to meet this first objective. Such a known sawing machine comprises, for this purpose, several other saws coupled to the conveyor and offers supports arranged accordingly so that they can hold the pieces of wood on either side of the saws. Such a machine includes a device making it possible to modify, at standstill, the distance separating two saw blades. However, such a machine 30 operates in campaigns and can, therefore, continuously saw pieces of wood only according to predetermined lengths.

  A first object of the invention is therefore to propose a sawing machine capable of sawing, continuously, pieces of wood according to selected lengths.

  Another object of the invention is to propose a machine for sawing such pieces of wood and which can also sort them by length classes.

  For this purpose, there is provided a sawing machine comprising a saw coupled to a conveyor comprising rotary drive means able to circulate in loops the drive means of the workpieces to be sawed towards the saw, said machine being remarkable in that the means for driving the parts comprise receptacles intended to receive parts respectively, each receptacle being provided with an adjustable type stop so as to be able to adjust the length of embedding of the part in its corresponding receptacle. The sawing machine 10 is then able to saw pieces according to different lengths.

  According to an additional characteristic of the invention, the stop consists of a cleat through which a screwing means takes hold in a post mounted in a longitudinal groove of the receptacle. The adjustment of the longitudinal position of the stop is thus very easily obtained.

  According to an additional characteristic of the invention, the drive means of the parts comprise support plates assembled in an articulated manner to each other by means of axes, each support plate being provided with at least one receptacle. The parts drive means are thus mounted on the conveyor without using chains.

  According to an additional characteristic of the invention, each support plate comprises beams supporting said or each receptacle, a common axis passing through the beams of two consecutive support plates.

  According to an additional characteristic of the invention, the axes cooperate with grooves produced at the periphery of the rotation drive means in order to mechanically link the support plates to said rotation drive means during their rotations around the latter.

  According to an additional characteristic of the invention, the conveyor rests on a chassis of said machine while being positioned so that each of the axes of rotation of the rotation drive means forms an acute angle with a plane 30 passing through the base of said frame. The support plates are thus positioned in an inclined manner along their transverse planes, which allows positioning of the parts, by gravity, against the stops provided in the receptacles.

  According to an additional characteristic of the invention, the support plates respectively comprise guide means intended to cooperate with raceways fixed on flanges constituting the conveyor to guide them in two orthogonal directions.

  According to an additional characteristic of the invention, the guide means consist of bearings causing little loss of energy by friction.

  According to an additional characteristic of the invention, the sawing machine comprises a sorting device provided to allow sorting by length classes the previously sawn pieces.

  According to an additional characteristic of the invention, the sorting device consists of slides arranged in an unloading zone located below the conveyor, the free ends of the slides being offset with respect to each other so that the receptacles having substantially the same installation length of parts can be completely discovered by said 1 5 slides when they are positioned at a particular location when moving the support trays in the unloading area. The pieces of the same length class arranged in these receptacles thus fall, by gravity, to the same location. Containers are arranged below the different locations to collect, by length classes, the pieces after their 20 falls.

  According to an additional characteristic of the invention, the slides have means for adjusting their positions vis-à-vis the support plates in order to adapt the effort of holding the slides to the dimensions of the parts.

  According to an additional characteristic of the invention, the slides are fixed to the machine by means of elastic means in order to provide an elastic behavior to the slides so that they can press the parts into their receptacles without excessive tightening.

  The characteristics of the invention mentioned above, as well as others, will appear more clearly on reading the following description of an exemplary embodiment, said description being made in relation to the accompanying drawings, among which: Fig. 1 shows a front perspective view of a sawing and sorting machine for parts without its protective casings and without support plates according to the invention, FIG. 2 shows a sectional view of a conveyor for a sawing and sorting machine for parts according to the invention, FIG. 3a shows a bottom view of a pair of support plates for a conveyor of a sawing and sorting machine for parts according to the invention, FIG. 3b shows a side view of a pair of support plates for a conveyor of a sawing and sorting machine for parts according to the invention, FIG. 4 shows a sectional view of a machine for sawing and sorting parts according to the invention, FIG. 5a shows a section view of a receptacle of a support plate 10 for a conveyor of a sawing and sorting machine for parts according to the invention, FIG. 5b shows a front sectional view of a support plate for a conveyor of a sawing and sorting machine for parts according to the invention, FIG. 5c shows a top view of a support plate for a conveyor of a sawing and sorting machine for parts according to the invention, FIG. 6 shows a dorsal perspective view of a machine for sawing and sorting parts according to the invention, and FIG. 7 shows a schematic view of a sorting device for a sawing and sorting machine for parts according to the invention.

  The machine 100 for sawing and sorting parts which is shown in FIG. 1 is intended, in particular, for the manufacture of wooden cleats. The machine 100 essentially consists of a chassis 200 on which is mounted a conveyor 300 carrying a saw 400.

  The chassis 200 consists of a metal structure resting on a base 25 202 provided with jacks 210 for wedging on the ground.

  The conveyor 300 mainly consists of two flanges 310 and 311 between which and at their free ends of which are rotatably mounted, by means of shafts 312 and 313, rotational drive means 314 and 315, formed at this Fig., Of two pairs of drive rollers 314 and 315 and which are intended to drive, in loops, means for driving the parts P, not shown in this Fig. A drive motor 320 such as a variable speed gearmotor is mounted against one of the flanges 310 or 3 1 1 so as to allow the drive in rotation of a shaft, in this case the shaft 312 to Fig. 1 and the pair of drive rollers 314 associated therewith.

  The conveyor 300 is fixed to the chassis 200, for example, by means of a support 302. The conveyor 300 is fixed to the chassis 200 while being positioned in an inclined manner relative to the base 202 and in a direction transverse to the chassis 200. The value of this inclination, measured for example between the axis of rotation of a shaft 312 or 313 and a plane passing through the base 202, is of the order of 60.

  The saw 400 consists of a drive motor 410 capable of driving a cutting tool 420, advantageously a circular saw. The saw 400 is fixed to the conveyor 300 near the pair of rollers 314 driven by the gear motor 320.

  In Fig. 2, the means for driving the parts P consist of support plates 500, 500 ′ assembled in an articulated manner with each other and which are arranged in loops around the pairs of rollers 314 and 315 so as to be able to circulate, in particular , following rectilinear trajectories between said pairs of rollers 314 and 315, as indicated by arrows A and B in this FIG. 2. When the support plates 500, 500 ′ circulate above the conveyor 300, that is to say, when they move along the path A, they move between a loading zone E and a sawing zone o the circular saw 420 can be used to saw the free ends of the protruding parts P of the support plates 500, 500 '. When the support plates 500, 500 ′ circulate below the conveyor 300, that is to say, when they move along the path B, they allow the unloading of the cut pieces P in an unloading zone D. The saw 400 is provided with a suction device 430 making it possible to evacuate the sawdust produced during the sawing operation of the P parts. It is also noted the presence of a pressing device 440 intended to press, during sawing, the P parts in their respective support plates 500, 500 '.

  Two consecutive support plates 500, 500 ′ are joined by an axis 510 forming an articulation between them. The axes 510 also cooperate with grooves 316 produced at the periphery of the pairs of drive rollers 314 and 315 30 in order to mechanically link the support plates 500, 500 ′ to the drive rollers 314 and 315 during their rotations around these last. The rotary drive, represented by arrow C, of the shaft 312 by the gear motor, not shown in this FIG. 2, then allows said loops 500, 500 'to be driven in loops.

  It will be noted, in FIG. 4, that given the inclined arrangement of the conveyor 300 and in particular the axes of its shafts 312, 313, the support plates 500, 500 ′ are also arranged in an inclined manner when they circulate between the drive rollers 314 and 315 .

  In Figs. 3a and 3b, a pair of support plates 500 and 500 'is shown.

  The first support plate 500 consists of at least one receptacle 520 fixed on longitudinal members 530 and 531 crossed by two axes 510. Several receptacles 520 are fixed on two longitudinal members 530 and 531 in these FIGS. 3a and 3b. The second support plate 500 ′ is articulated to the first via a common axis 510. This second support plate 500 ′ differs from the first by a different positioning of its longitudinal members 530 ′ and 531 ′ allowing said axis 510 to pass through the stringers 530, 531 and 530 ', 531'. In Fig. 3a, the longitudinal members 530 'and 531' are placed inside the longitudinal members 530 and 531.

  We also note in these Figs. 3a and 3b, the presence on each plate 500, 15 500 'of guide means 540, 541 and 542, 543 such as bearings. The bearings 540 and 541 are mounted respectively at the free ends of each axis 510, while the bearings 542, 543 are fixed to the outside of the longitudinal members 530, 531 or 530 ', 531' with their rolling faces arranged substantially perpendicularly to that of bearings 540 and 541.

  In Fig. 4, the flanges 310 and 311 are provided respectively, in particular in the loading area E and possibly in the unloading area D, with raceways 330 and 331 capable of cooperating with the bearings 540, 541 and 542, 543 of the plates supports 500, 500 ′ to guide them in two orthogonal directions and, more precisely, in a first direction perpendicular to the axis of rotation of the shafts 312, 313 of the drive rollers 314, 315 and in a second direction parallel to the 'axis of rotation of the shafts 312, 313 of the drive rollers 314, 315, thus allowing the support plates 500, 500' to circulate without parasitic play, in particular, during the sawing operation of the pieces P by the circular saw 420.

  In Fig. Sa, the internal section of each receptacle 520 is adapted to partially wrap the sides of a piece P so as to be able to maintain it during a sawing operation. In this Fig. Sa, the receptacle 520 has a U-shaped section which is adapted to receive parts P of square or rectangular section.

  In Fig. 5c, the support plate 500 shown comprises four receptacles 520. Each receptacle 520 is provided with a stop 550 allowing the longitudinal positioning of a part P in the receptacle 520. The stop 550 is preferably of adjustable type in order to be able to adjust the installation length L of the part P in its corresponding receptacle 520. The stop 550 is, for this purpose, constituted in FIG. 5b of a cleat 552 traversed by a screwing means 554 taking hold in a tenon 556 mounted in a longitudinal groove 522 of the receptacle 520.

  In Fig. 4, it will be noted that taking into account the inclination of the conveyor 300, and consequently of the support plates 500, 500 ′, the pieces P are positioned, when they are loaded into the receptacles 520 and under the effect of gravity, against the stops 550. The parts P remain positioned thus until they are removed from their receptacles 520.

  In Fig. 6, the machine 100 is also provided with a sorting device 600. It is intended to allow sorting by length classes the pieces P 15 previously sawn. The sorting device 600 operates below the conveyor 300, in the unloading zone D. Containers 230, mounted for example on the chassis 200, are arranged at the foot of the unloading zone D. It will be noted in this FIG. 6, that the sawing and sorting machine 100 is provided with a device 110 for collecting scraps cut by the saw 400. The scraps can then be collected in a container 230 ′.

  The sorting device 600 consists of slides 610 arranged parallel to the support plates 500, 500 ′ and, preferably, parallel to the direction of circulation of the support plates 500, 500 ′ in the unloading zone D. For reasons of clarity, only a pair of support plates 25 500, 500 ′ is shown in this FIG. 6.

  In Fig. 4, the slides 610 are also arranged in such a way that they are able to hold the parts P in the receptacles 520 on part of the path of the support plates 500, 500 ′ in the unloading zone D. In FIG. 4, the slides 610 are mounted on arms 620 fixed to uprights 630 which are mounted on the machine 100, for example, on the flange 311 of the conveyor 300 in this FIG. 4. The slides 610 have adjustment means 640 for their positions with respect to the support plates 500, 500 ′ in order to adapt the effort of holding the slides 610 to the dimensions of the parts P. In this FIG. 4, the adjustment means 640 are constituted by sliding flanges mounted respectively between the arms 620 and the uprights 630. An elastic means 642, such as an elastomer plate, can also be interposed between each upright 630 and its support in order to provide an elastic behavior to the slides 610. They can thus keep the P parts in their receptacles without play.

  In Fig. 7, the slides 610 are arranged parallel to each other. The free ends of the slides 610 are offset with respect to each other so that the receptacles 520 having substantially the same fitting length L of the parts P can be completely discovered by said slides 610 when they are positioned at a particular location 10 during the movement of the support plates 500, 500 ′ in the unloading zone D along the path B. Thus, the parts P placed in the receptacles 520 which have been sawn and which have substantially the same length, are under the effect of the gravity, in the same place and in particular in the same container 230 shown here on the right of FIG. but which is actually located under said location, as shown in Figs. 4 and 6.

  In Fig. 7, the length interval between the sorted pieces P of the same length class can be changed by modifying the distance S separating two neighboring slides 610.

  Other slides in the form of arcs of a circle, not shown, are arranged at the ends of the conveyor 300 at the periphery of the drive rollers 314 and 315 so as to be able to hold the parts P in the support plates 500, 500 ′ during of their rotations around said rollers 314 and 315.

  The operation of the sawing and sorting machine 100 is as follows. The machine 100 is started, the geared motor 320 then drives the support plates 500, 500 ′ which thus circulate in loops around the drive rollers 314 and 315 and the circular saw 420 is rotated. An operator deposits parts P in receptacles 520 while they are circulating in the loading area E. The parts P are positioned, under the effect of gravity, against the stops 550 due to the inclination of the support plates 500 , 500 '. The pieces P 30 are taken in the direction of the saw 400 where they are pressed into their respective receptacles 520 by the pressing device 440. The circular saw 420 then cuts the free ends of the pieces P protruding from their respective receptacles 520. The cut cuts are discharged by the collection device 110 into a container 230 '. The support plates 500, 500 ′ containing the truncated P parts continue their paths in loops and are transferred to the unloading zone D, after having bypassed the rollers 315. There, the slides 610 hold the truncated P parts in their receptacles 520 for one part of the path of the support plates 500, 500 ′ in the unloading zone D. When the parts P are not held by any of the slides 610, they fall, under the effect of gravity, into containers 230 where they are sorted by length classes in the containers 230. The support trays 500, 500 ′ leave the unloading area D, bypass the rollers 314 and return again to the loading area E o new pieces P can be placed in receptacles 520 .

  It is possible to modify the lengths of the sawn parts by modifying the longitudinal positions of the stops 550 mounted in the receptacles 520.

  It is also possible to modify the length interval of the same length class of the sorted parts by modifying the distance S separating two neighboring guides 610.

  The sawing and sorting machine of the invention makes it possible to carry out sawing and sorting operations on parts consecutively with the help of a single operator for loading.

  It allows, by a simple adjustment, the modification of the lengths of the sawn pieces as well as the interval of the length classes of the sorted pieces.

Claims (12)

  1) machine (100) for sawing parts (P) comprising a saw (400) coupled to a conveyor (300) comprising rotation drive means (314, 315) capable of circulating in drive loops the drive means workpieces (P) to be sawn towards the saw (400), characterized in that the workpiece drive means (P) 5 comprise receptacles (520) intended to receive workpieces (P) respectively, each receptacle (520) being provided with an adjustable type stop (550) in order to be able to adjust the fitting length (L) of the part (P) in its corresponding receptacle (520).   2) sawing machine (100) according to claim 1, characterized in that the stop (550) consists of a cleat (552) traversed by a screwing means (554) taking hold in a stud (556) mounted in a longitudinal groove (522) of the receptacle (520).   3) sawing machine (100) according to claim 1 or 2, characterized in that the workpiece drive means (P) comprise support plates (500, 15,500 ') assembled in an articulated manner with each other by the 'intermediate axes (510), each support plate (500, 500') being provided with at least one receptacle (520).   4) sawing machine (100) according to claim 3, characterized in that each support plate (500, 500 ') comprises longitudinal members (530, 531; 530', 531 ') supporting said or each receptacle (520), a common axis (510) passing through the longitudinal members (530, 531; 530 ', 531') of two consecutive support plates (500, 500 ').   5) sawing machine (100) according to claim 3 or 4, characterized in that the axes (510) cooperate with grooves (316) formed on the periphery of the rotation drive means (314, 315) in order to bind mechanically the 25 support plates (500, 500 ′) to said rotation drive means (314, 315) during their rotations around the latter.   6) sawing machine (100) according to one of the preceding claims, characterized in that the conveyor (300) rests on a frame (200) of said machine (100) while being positioned so that each of the axes of rotation 30 means for driving in rotation (314, 315) forms an acute angle with a plane passing through the base (202) of said chassis (200).   7) sawing machine (100) according to one of claims 3 to 6, characterized in that the support plates (500, 500 ') respectively comprise guide means (540, 541 and 542, 543) intended to cooperate with raceways (330, 331) fixed on flanges (310, 311) constituting the conveyor (300) to guide them in two orthogonal directions.   8) sawing machine (100) according to claim 7, characterized in that the guide means (540, 541 and 542, 543) consist of bearings.   9) Sawing machine (100) according to one of the preceding claims, characterized in that it comprises a sorting device (600) provided to allow sorting by length classes the pieces (P) previously sawn.   10) sawing machine (100) according to claim 9, characterized in that the sorting device (600) consists of slides (610) arranged in an unloading zone (D) located below the conveyor (300), free ends of the slides (610) being offset from one another so that the receptacles 15 (520) having substantially the same length of fitting (L) of parts (P) can be completely discovered by said slides (610) when 'they are positioned at a particular location when the support plates (500, 500') are moved in the unloading area (D).   11) Sawing machine (100) according to claim 10, characterized in that the slides (610) have means for adjusting (640) their positions with respect to the support plates (500, 500 ') in order to '' adapt the slide holding force (610) to the dimensions of the parts (P).   12) Sawing machine (100) according to claim 10 or 11, characterized in that the slides (610) are fixed to the machine (100) by means of elastic means (642) in order to provide elastic behavior to slides (610).