Classifications

• • D—TEXTILES; PAPER
  • D05—SEWING; EMBROIDERING; TUFTING
  • D05B—SEWING
  • D05B7/00—Linking machines, e.g. for joining knitted fabrics

Definitions

• the invention relates to a remeshing machine ensuring the assembly of lacunary sheets by means of a wire passing in the middle of gaps of an upper layer and binding with a lower layer, that these gaps are delimited by meshes, by a crisscrossing in weft and warp threads or by spaces between threads arranged randomly in mats.
• the state of the art provides numerous re-grinding machines that can be used in making to knit another knit piece, such as a U-folded collar, to sandwich the edge of a knitted piece.
• the remeshing operation requires to match each of the stitches of a border row of the workpiece to be reported with the vertical trajectory of the needle carrying the connecting thread with the lower ply.
• this matching of the meshes is ensured, either by combs on the teeth of which the meshes must be put in place manually, which gives a low yield, either by a vision or imaging installation comprising on the one hand, a camera locating the mesh or loophole of the next link area on the part to be reported and, secondly, a set of processing signals collected.
• this assembly analyzes the position of the next stitch and defines the value of the relative displacements to be communicated, respectively, to the parts to be assembled and / or to the needle, to bring the stitch of the next stitching area. connection in the vertical path of the needle of the machine.
• the invention relates more particularly to the remeshing machines comprising a vision installation, working or not by locating a contrasting thread included in the edge area of the element to be assembled with another.
• JP 09 103589 a remesher machine in which the upper blank of the insert, bent in a U around the edge of the receiving part, is clamped between two frames which, before each new stitching, are moved according to the X and Y directions defined above, to bring a mesh of this blank, identified by imaging equipment, in coincidence with a reference position, corresponding to the projection in the horizontal plane of the vertical path of the needle.
• the object of the present invention is to remedy the various disadvantages mentioned above and to provide an automated remeshing machine, working at high speed and producing, by a straight and regular seam and in a continuous manner, the binding of lacunary sheets by a through wire. gaps and whose engagement in a gap occurs without risk of coming into contact with the son or fibers of the reported web.
• This machine comprises the following means described in the state of the art: - a sewing mechanism with an upper vertical needle and a lower hook,
• a support structure supporting the plies to be assembled in the assembly zone by stitching, this structure being combined with means capable of driving the plies in the direction of the stitching X, means ensuring the relative movements of the gaps in the needle; horizontal plane, respectively, in the X direction of the seam and in the Y direction perpendicular thereto,
• a vision installation with, on the one hand, a camera observing an examination zone surrounding the seam area and, on the other hand, a processing unit defining, during each quilting, the positioning of the next gap. and reacting to control and control the means ensuring the relative displacements, so that at the time of tapping, the vertical path of the needle coincides with the gap.
• the means ensuring the displacement in the direction of seam X move all the plies to be assembled and are associated with means ensuring the movements of the entire sewing mechanism, needle and hook, in both directions and in the direction Y
• the latter means comprise a vertical carriage which, slidably mounted relative to the frame of the machine, carries the connecting means and transmission of movement between the sewing mechanism and its motor means, the latter motor means being independent of those actuating the drive means of the webs and those ensuring the movements of the carriage, all carried by the chassis but all under the control and direction of the same processing unit and control, and so that the position of stitching of each stitching gap results from the displacement of the plies according to the single direction of seam X and the movement of the needle with the mechanism sewing in only Y direction.
• the carriage which ensures the positioning of the needle on the Y axis is freed from the heavier elements, ie the motors carried by the frame of the machine, and bears itself only elements ensuring the connection between the quilting mechanism and its motor and between the truck and the engine communicating its movements. Thanks to this relief of the means of displacement on the Y axis, the positioning of each new gap, mesh, hole or crisscrossing of threads or fibers, identified by the vision equipment, is effected by two independent means, not very heavy, having less inertia, and making it possible to improve the sewing speed and the general machine performance The next gap in the web connection is detected at the same time as the gap in the preceding gap, so that the machine operates without a dead time, with permanent target tracking.
• the reduction of the inertia improves the positioning accuracy and allows, by the certainty that the needle passes through the gap, without touching the son or fibers defining this gap, to apply this method of connection to the attachment of the reportable parts on Composite lacunary structures, of various textile-fiber yarns type used in technical textiles.
• the assemblies obtained can be used in reinforcements of various composite structures, but also in so-called intelligent clothing textiles and comprising data transmission fibers or fibers performing any other technical function, as long as these fibers retain their integrity.
• the carriage In one embodiment of this re-grinding machine, the carriage:
• the carriage is constituted by a recumbent U-shaped frame having an upper horizontal arm and a lower horizontal arm connected by a vertical core, the upper horizontal arm being provided with a vertical downward bearing bearing.
• the mechanism of the needle each arm of this carriage carrying: - On the same side, skids by which it slides in a horizontal slide fixed against the corresponding arm of a frame, of the same general shape as the carriage and,
• the means for guiding and transmitting the movements of the needle and the hook are provided on the other side, the means for guiding and transmitting the movements of the needle and the hook.
• each of the arms of the carriage carries bearings for a horizontal shaft of action of the hook or the needle mechanism, each shaft being connected by a transmission of movements by pulleys and belt to the shaft carried by the other arm.
• one of these shafts is provided with a toothed wheel which, meshing with a pinion wedged on the output shaft of the driving motor of the needle and the hook, is narrower than the pinion to remain in position. taken with him despite the cart's movements.
• the toothed wheel remains in engagement with the drive pinion, despite the movements of the carriage in a direction parallel to the longitudinal axis of the pinion.
• the means ensuring the movement movements of the webs comprise:
• Figures 1 and 2 are perspective views of the machine, respectively, with its cover and without;
• Figures 3 and 4 are perspective views of the carriage carrying the sewing equipment, respectively, on one side with connection to its displacement motor and on the other side, without this motor and to show the guide pads;
• Figure 5 is a perspective view of the rear portion of the frame of the machine showing the guide rails of the carriage;
• Figure 6 is an external perspective view of the means for moving the webs
• Figure 7 is a vertical sectional view in the longitudinal median plane means for moving the webs
• Figure 8 is a plan view over the work area, from a horizontal plane disposed under the needle, schematizing the means of the invention
• Figure 9 is a sectional view along IX-IX of Figure7 showing on an enlarged scale the arrangement of the webs in the seam area;
• Figures 10 and 11 are respectively views, respectively, in cross-section and elevational side along Xl-Xl of Figure 10, showing an embodiment of the disengageable drive device of the carriage.
• the machine to be reweld in the general shape of a sewing machine and comprises a body 2 with, in the upper part, a gooseneck 3 and, at the bottom, a plate 4.
• the spout 3a The gooseneck contains a portion of the mechanism of the needle 5 and supports various means which will be described with reference to Figures 2 and 3.
• the plate 4 is extended by a housing 6 containing the means of advancement of the sheets N1 and N2 to to assemble.
• the assembly is protected by removable covers 7, 8 and 9, which are removed in FIG.
• FIG. 3 shows an embodiment of the carriage 11 carrying the sewing mechanism C, that is to say the needle and its hook. with their training means.
• this carriage 11 is constituted by a metal frame
• the arms 10a and 10b carry skids 12 which, projecting from their lateral face, are intended to slide in horizontal slides 13, represented in FIG. 5.
• These slides are carried by the arms 14a. and 14b of the frame 14 of the machine, comprising, as shown in this figure 5, a horizontal flange 14s and, on either side of the core 14d connecting the arms 14a and 14b, vertical flanges 14f and 14g for fixing the motor means.
• the sewing mechanism C is carried by a carriage 11 which is movable in both directions in the Y direction of the neck of the machine, that is to say perpendicular to the X direction of sewing.
• the movements of the carriage 11 are provided by an electric motor 15 whose body is fixed on the vertical flange 14f of the frame 14, as shown in FIG. 2. Its horizontal output shaft is connected by a coupling 15a. to the shaft 16 of a drive device 17 disengageable end of stroke, described below.
• FIG. 3 shows that the lower horizontal arm 10b of the carriage 11 carries, against its lateral face opposite to that carrying the shoes 12, two bearings 18 for a drive shaft 19 of the hook 20, cooperating with the needle 5, while the upper arm 10a carries two bearings 22 for a horizontal shaft 23 driving the actuating mechanism 24 of the needle 5.
• This needle mechanism 24, which is only one element of the sewing mechanism C, n It is not described in detail because it is well known by sewing machine manufacturers and is not part of the invention.
• the rear ends of the two shafts 19 and 23, carried by the carriage 11, are connected in rotation, for example by pulleys, respectively, driving 25 and return 26, they themselves connected by a belt 27, ensuring the synchronization of their movements , that of the needle 5 with that of the hook 20.
• the rear end of the shaft 23 is also integral with a toothed wheel 28 which, as shown in Figure 2, meshes with a pinion 29 wedged to the end of the output shaft of an electric motor 30.
• the body of this motor is also fixed on the vertical flange 14f. Note that the pinion 29 is much longer than the width of the toothed wheel 28, so that it remains in engagement with him over the entire travel path of the carriage 11.
• the blue light emitter 38 used for marking a colored wire 41 previously disposed in the edge of the reported web N2, - and the mechanism 39 of the presser foot 40.
• This distribution of the equipment makes it possible to limit the mass of the carriage and, consequently, to limit the inertia which it opposes with each change of state, such as stop, forward movement to the right or recoil movement. g to the left, to improve the positioning accuracy provided by control means responsive to data processing means provided by the vision equipment 37.
• the drive means of the plies N1 and N2 comprise an electric motor 42 whose body is fixed on the flange 14g of the frame of the machine (FIGS. 2 and 5).
• the output shaft 43 of this motor is connected in rotation to a horizontal transmission shaft 44.
• FIG. 2 shows that this shaft runs along the frame 14, before entering the housing 6.
• the latter is fixed on a rib 45 which , disposed transversely to the frame 14, is screwed on and against the sole 14s of this frame.
• the housing 6 contains bearings, not shown, for two driving pulleys 46, shown in FIG. 7, for two return pulleys 47 and for two intermediate pulleys 48.
• the return pulleys 47 are disposed at the upstream end of the work zone. and have a smaller outer diameter than that of the intermediate pulleys 48, arranged upstream of the needle 5.
• pulleys are connected by belts 50a and 50b which are gripping externally, and, for example are made of material with a high coefficient of friction and / or are notched externally to ensure a good entrainment of the plies clad on them by a presser foot 40.
• belts 50a and 50b which are gripping externally, and, for example are made of material with a high coefficient of friction and / or are notched externally to ensure a good entrainment of the plies clad on them by a presser foot 40.
• the upper strands of the belts form a sloping input area K, facilitating the engagement of the sheets in the work area and allowing the operator to position the plies to be assembled, so that the U-shaped folded sheet N2 can grip the edge of the receptive sheet N1, as shown in FIG. 9.
• FIGS. 8 and 9 show that these two belts 50a and 50b are spaced from one another by a value E and that this spacing is effected on either side of a vertical median plane MV intersecting the plane horizontal working P along a line parallel to the sewing direction, represented by the axis X.
• this axis X is perpendicular to the axis Y 1 materializing the direction of movement of the carriage 11, and is orthogonal to the Z axis of the ideal vertical path of needle 5, when it is correctly positioned.
• the machine also comprises a unit 52 for processing the data and images coming from the camera 37, thanks to an electrical connection 53.
• this unit 52 controls the motor electrical drive 30 of the needle 5 and the hook 20, and the motors 15 and 42 controlling the movements of displacement, the carriage 11 on the Y axis and N1 and N2 plies on the X axis.
• the data and image processing is provided by the camera processing means, arranged inside thereof, which reduces the construction and reduces cabling and costs.
• At least the two motors, 15 and 42, are reversible movements and feed step, so as to perfectly control the movements they communicate.
• the body of the device is composed of two elements 60a and 60b which surround the shaft 16 and define two end chambers 62a and 62b. Each of them comprises three rollers 63 mounted free to rotate on pivots 64, angularly spaced at 120 ° around the cylindrical shaft 16.
• FIG. 11 shows that the axis of each pivot 64 is not parallel to the axis of the shaft 16 but forms with it an angle a.
• these pivots 64 are arranged radially so that each roller 63 comes into contact with the shaft 16.
• the two elements 60a and 60b of the body of the device are assembled by at least two screws 65 which screw in one of them, for example in that 60a and freely passes through 60b through a bore 66.
• the head 66a of each of screw relies on the element 60b via a spring 67.
• the screwing or unscrewing of the screws 65 determines, by compression or decompression of the springs 67, the effort of plating the edges of the rollers 63 against the tree 16.
• FIG. 9 shows that the transverse travel T of the needle 5 and the hook 20 on the Y axis is distributed on both sides of the vertical median plane MV and has a value which is lower, on the one hand, at the spacing value E between the two driving belts 50a and 50b of the plies N1 and N2, and, on the other hand, on the other hand, at the width S of the housing 40a formed in the presser foot 40.
• the value of T is of the order of 8 millimeters and that of S is of the order of 10 millimeters.
• the automatic advance means are first calibrated.
• the camera 37 takes, in an examination zone A of the sheet N2 to be assembled with the sheet N1, an image comprising the representation of the marker wire 41, (FIG. 8).
• the latter previously arranged in the room to be reported N2 and near the row R of gaps L to be used to ensure the connection of the sheets, is all the more visible that it contrasts other son by its color or not its reaction to the UV light diffused by the lamp 38.
• the image appearing on a screen, not shown in the drawing, also shows the meshes or gaps of the row R which are in the examination zone A and close to the initialization position of the sewing mechanism C, which allows the operator to select the mesh or departure gap LO and to manually coincide this gap with the needle 5 in the initialization position.
• the automation provided by the processing unit 52 comes into action, controlling successively, the location by the camera 37 of the position of the following lacuna L1, the displacement on the X axis of the plies N1 and N2 simultaneously with the displacement on the Y axis of the sewing mechanism C, to make the gap L1 coincide with the position of the needle 5, then the realization from the stitching point, before automatically restarting a new cycle.
• the carriage 11 carrying this needle moves on the Y axis of the the race assigned to it by the unit 52.
• the accuracy of this race is even greater than the mass of the carriage 11 is small and for each new sewing point the coordinates thereof are calculated from coordinates of the previous position.
• the machine works continuously, without any dead time, and automatically, the operator having only to manually organize the folding of the sheets upstream of the examination zone A and as the belts 50a and 50b causing these webs. It is not necessary to develop the working method of the processing unit 52 since it is independent of the present invention and is more fully described in the Applicant's earlier document WO 03/060219.
• the machine which has just been described in the context of its application to the assembly of plies having gaps may also ensure the assembly of knit pieces on a knitted tablecloth, or woven fabric, and generally the assembly of all webs having local location with location and random manner, gaps or holes whose dimensions allow the passage of a needle carrying the wire or any operation requiring precision and a random location, non-rigid, detection and Selection.

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• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Sewing Machines And Sewing (AREA)

Applications Claiming Priority (2)

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Cited By (1)

Family Cites Families (3)

• 2006
  • 2006-12-21 FR FR0611151A patent/FR2910497B1/fr not_active Expired - Fee Related
• 2007
  • 2007-12-19 EP EP07872396A patent/EP2115202A2/de not_active Withdrawn
  • 2007-12-19 WO PCT/FR2007/002109 patent/WO2008093014A2/fr not_active Ceased
  • 2007-12-19 CN CN200780050852A patent/CN101657577A/zh active Pending

Non-Patent Citations (1)

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