EP0194182B1 - Work piece steering device at a sewing machine - Google Patents

Work piece steering device at a sewing machine Download PDF

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Publication number
EP0194182B1
EP0194182B1 EP86400322A EP86400322A EP0194182B1 EP 0194182 B1 EP0194182 B1 EP 0194182B1 EP 86400322 A EP86400322 A EP 86400322A EP 86400322 A EP86400322 A EP 86400322A EP 0194182 B1 EP0194182 B1 EP 0194182B1
Authority
EP
European Patent Office
Prior art keywords
article
installation according
guide
processing
edge
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP86400322A
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German (de)
French (fr)
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EP0194182A1 (en
Inventor
Jean-Marie Bachmann
Jacques Pion
Jean-Pierre Raisin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Institut Textile de France
Original Assignee
Institut Textile de France
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from FR8502519A external-priority patent/FR2577578B1/en
Priority claimed from FR8511509A external-priority patent/FR2585378B2/en
Application filed by Institut Textile de France filed Critical Institut Textile de France
Priority to AT86400322T priority Critical patent/ATE46725T1/en
Publication of EP0194182A1 publication Critical patent/EP0194182A1/en
Application granted granted Critical
Publication of EP0194182B1 publication Critical patent/EP0194182B1/en
Expired legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B35/00—Work-feeding or -handling elements not otherwise provided for
    • D05B35/10—Edge guides
    • D05B35/102—Edge guide control systems with edge sensors
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05D—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES D05B AND D05C, RELATING TO SEWING, EMBROIDERING AND TUFTING
    • D05D2207/00—Use of special elements
    • D05D2207/02—Pneumatic or hydraulic devices

Definitions

  • the refocusing means consist of a carousel movable in rotation above the work table and the frame of the processing machine, this carousel with several pads that can be applied to the part being processed.
  • Such an installation is complicated and requires the workpiece to be held flat without folds on the work table, during treatment.
  • the recentering means comprise a part of the working table movable in rotation about an axis which is perpendicular thereto, and motor means controlled by the detection device to rotate said movable part in a suitable direction depending on the position of the part.
  • This installation is mainly intended for linear treatment along a curved edge, having a regular curvature, for example a male panty; it is not suitable for the treatment of parts having various profiles, for example a successively convex then concave curvature, nor for the treatment of parts of reduced dimensions.
  • the upstream and downstream as well as the right and the left are to be situated in relation to the movement of the part during its treatment.
  • the notion of right and left is to be considered as dependent on the right or left character of the processing machine itself, or on the way of placing the part and its edge relative to said machine.
  • the part to be treated will first pass over the mobile support, which is most upstream, then under the active guide before being introduced under the drive device of the treatment machine.
  • the detection device will control the refocusing of the part by displacement, either of the only active guide, or of the only movable support or of these two means. same time in the same direction or even in opposite directions.
  • the installation according to the invention allows a much more precise refocusing thanks to the combination of the two distinct means, which can act either together or independently of one another depending on the position of the part. and its shape.
  • the detection device will advantageously include four detectors, the fourth being located upstream of the active guide, to the left and substantially distant from the line reference.
  • the first two detectors are placed symmetrically with respect to the reference line, likewise.
  • the detector device comprises four detectors
  • the third and the fourth detectors are placed symmetrically with respect to the reference line.
  • the active guide consists of a member that applies to the workpiece and moves it by sliding it on the work table.
  • it consists of a rotary member coming into contact with the part and rotating around an axis situated in a vertical plane substantially parallel to the processing axis, said rotary member comprising on its periphery several identical elements, intended to come into contact with the part, each of said elements having the shape of a disc, being free to rotate and being placed in a radial plane relative to the axis of rotation of the rotary member.
  • the presence of the discs, on the periphery of the rotary member and in contact with the workpiece, allows during the rotation of said member to move the workpiece transversely relative to the treatment axis, while limiting friction during the advancement of the part thanks to the rotation of said discs on themselves.
  • the mobile support can consist of a part of the work table, mobile in rotation around a perpendicular axis, as described in French patent FR-A-2 457 920. It can also consist of an endless belt whose strand upper is placed in the plane of the work table and in continuation thereof.
  • the linear processing installation described above can operate in a manner which is not yet appropriate.
  • the refocusing means automatically follow the edge of the part without the treatment stopping. actually at the desired location for the end of treatment.
  • the counting device is intended to give a numerical value to the treatment along the edge of the part. In particular, this will involve counting stitches for sewing or planking along the edge of a textile piece. In the latter case, counting is obtained by detecting the reciprocating movement of the needle bar of the sewing machine: the counting device then comprises a detector, which counts the oscillations of the needle bar.
  • the counting device controls the action of the recentering means so that the stopping of the motor means of the turntable and the lifting of the active guide are controlled as soon as the counting device has recorded a numerical value given, function of the length of the edge to be treated of the flexible part.
  • the numerical value in the case of a seam of a certain type, can correspond to the number of stitches necessary to carry out the seam over a distance slightly less than the total length of the edge to be sewn.
  • the counting device records, for each piece, the number of stitches made by the sewing machine since the start of sewing.
  • the numerical value can correspond to the number of stitches necessary to carry out sewing over a certain distance, between a locatable stitch and the end of the edge to be sewn.
  • This locatable point will for example be the limit of a locatable excess thickness thanks to a reflector type detection system mounted on the active guide placed opposite a photoelectric sensor.
  • the counting device controls the stopping of the motor means of the turntable and the lifting of the active guide which thereby loses contact with the workpiece; the seam continues linearly along the edge of the workpiece, without it being moved by the centering means.
  • This particular arrangement responds well to the difficulty encountered in making the end of the sewing selvedge escape from the control of the refocusing means when said selvedge has a profile close to a portion of the curve.
  • a retractable stop guide controlled by the counting device.
  • the guide surface of this abutment guide is, in the service position, positioned at a distance from the treatment line which corresponds approximately to the width of the part required between the treatment line and the edge of the part.
  • the counting device controls the commissioning of the stop guide and therefore the movement of the guide surface towards the position described above, simultaneously with the lifting of the active guide.
  • the drive device for moving, with respect to the treatment machine, the zone being treated of the part along the axis of treatment comprises means for varying the advance of the part in front the processing point, said means being controlled by the counting device.
  • the sewing machine has a differential shoe, the adjustment of which is controlled during sewing by the counting device.
  • This embodiment is particularly well suited for controlling the deformation of a knitted fabric during sewing.
  • the differential claw adjustment is predetermined as a function of the expected deformation of the knitting during sewing; and the adjustment during sewing is controlled by the counting device as a function of the number of stitches counted since the start of sewing.
  • the installation is intended to border textile pieces 1 during manufacture, for example to elasticize or glue briefs along a leg entry.
  • This installation comprises a sewing machine 2, specially equipped for carrying out the planking operation, with its drive device comprising a claw 33 and a presser foot 3, and the needle 4 which carries out the sewing along the sewing axis AA '.
  • the seam must be made at a certain distance e from the edge 5 to be sewn.
  • the edge of the piece 1 is located along the axis BB ', parallel to the sewing axis AA' and distant from it by the distance e to the right in the direction of advance of room 1 during planking.
  • the work table 6 supports the piece 1 throughout and after the planking operation.
  • a part 7 of the table 6 is movable in rotation around the axis 8 which is perpendicular thereto: this mobile part which we call turntable has an annular shape, surrounding the sewing machine 2 and a fixed part of the work table 6.
  • the turntable is driven in one direction or the other by motor means not shown.
  • the active guide 9 is positioned upstream of the presser foot 3, to the left of the reference line BB 'and to the right of the fixed part 6 of the work table.
  • This guide 9, as illustrated in FIG. 5, consists of a rotary member 10 rotating around an axis 11 and supporting on its periphery ten discs 12, free to rotate in recesses 13 formed radially in the member 10 It is placed above the table 6 so that it rests on the piece 1 during the planking and that the plane perpendicular to the table 6 passing through its axis of rotation 11 is parallel to the seam axis. AA '.
  • the action of transverse displacement of the discs 12 during the rotation of the member 10 takes place along the line CC'perpendicular to the processing axis AA 'in a zone 17 located at a distance D3 from the reference line BB' .
  • the distance D3 is a function of the behavior of the fabric constituting the piece 1 and also of the minimum radius of curvature of the piece; in any event D3 must be sufficient for the active guide 9 to always be in contact with the part 1 during the planking operation, as long as the latter has not exceeded the line CC ′.
  • Two photoelectric detectors 14 and 15 are placed on either side of the reference line BB 'in a plane perpendicular to said line located between the presser foot 3; one 14 to the right, the other 15 to the left of line BB ', they are placed symmetrically with respect to said line and their spacing defines the width of the correct guide zone and is a function of the distance e allowed for l planking operation.
  • Another photoelectric detector 16 is placed to the right of the line BB 'upstream of the active guide 9: it is distant from the line BB' by a distance D1 which is much greater than that existing between the detector 14 and the line BB 'and which is a function of the minimum radius of curvature of the part 1 to be bordered: the greater the curvature of the edge to be treated and the greater the distance D1.
  • Each of the three detectors 14, 15, 16 is designed to emit a signal when the part 1 is present above it.
  • the information sent by the three detectors, of the presence or absence of the piece 1 at each of their positions, makes it possible to know the exact position of the piece 1 in front of the sewing head, and to control the turntable 7 and / or the active guide 9 for orienting the part 1 all along its planking, according to a predetermined program.
  • the installation includes a sensor 30 placed at the top of the needle bar 4 'and capable of counting the number of movements “up” and “down” of said bar 4' during the sewing operation and therefore the number of sewing stitches.
  • a jack 18, integral with the sewing machine 2 is connected to the support 19 of the active guide 9.
  • the latter has a horizontal axis of rotation 21, making it possible to raise and lower the part 10 of the guide 9 under the action of the jack 18.
  • the connection between the rod of the jack 18 and the support 19 of the active guide 9 is provided by a flexible cable 20; thus when the rollers 12 of the guide 9 are applied to the piece 1 the cable 20 is relaxed and the rollers 12 can follow the differences in thickness that the piece 1 may have when it moves on the table 6.
  • the abutment guide 34 has a guide surface 36, against which the edge to be treated of the part 1 comes to bear when the jack 35 is got out.
  • the guide surface 36 of the abutment guide 34 is at a distance from the treatment line AA 'which corresponds approximately to the width e necessary between the treatment line AA' and the edge of the part BB '.
  • the guide surface 36 can. as illustrated in FIG. 2, present an angled shape 36 'adapted to prevent the edge to be guided of the piece 1 from lifting and therefore hold it against the table 6.
  • the jacks 18 and 35 are controlled by the counting device 30 .
  • the operation of the installation is as follows.
  • the piece 1 to be bordered is placed on the turntable 7, then the angle at which the seam must begin is introduced under the active guide 9 and under the presser foot 3.
  • the sew 2 is on on and the claw system 33 - presser foot 3 drives the piece 1 in the direction of the sewing axis AA '.
  • the three preceding operations, placing of the part 1 on the plate 7, introduction under the active guide 9 and under the presser foot 3, starting the sewing machine 2 are carried out either by an operator or automatically.
  • the recentering means which are the active guide 9 and the turntable 7 will, independently of one another or simultaneously, guide the piece 1 so that the seam is performs along the edge 5, substantially parallel to the latter and at a distance e.
  • the action of the refocusing means is controlled by the information received from the detectors 14, 15, 16 according to a defined program, an example of which is given in annex 1.
  • the columns entitled 14, 15, 16 define the state of each detector according to whether the part is present (X) above said detector or absent (-).
  • the column entitled “active guide” defines either the inaction of the rotary member 10 (0) or its rotation in the direction driving the part 1 to the right (D) or its rotation in the direction causing the part 1 to the left (G).
  • the column titled “turntable” uses the same parameters as the previous column for the turntable 7.
  • the right part of the table illustrates the position of the part relative to the detectors and the action of the recentering means: arrow f for the guide active 9 and arrow F for platform 7.
  • the stitch counting device 30 is programmed to count the stitches on the one hand from the start of sewing of each piece 1 to be treated, and on the other hand to order, when the number of stitches counted by the counting device 30 has been reached.
  • a pair of briefs as shown in Figure 3a, has a border length EF equal to 50 cm. It is desired to interrupt the action of the recentering means when the seam is produced according to the curve EF ′, the point F ′ being 2 cm from the point F which marks the end of the pord to be treated.
  • the stitch density obtained by the sewing machine 2 is 5 stitches per centimeter.
  • the numerical value given is equal to the number of points to cover the distance EF ', ie 240 points.
  • the active guide 9 comprises a system for detecting the oscillations to which the rollers 12 are subjected during variations in thickness of the part 1.
  • This detection system comprises a reflector 31 secured to the support 19 of the active guide 9, and a photoelectric sensor 32.
  • FIG. 3b represents a panty, to border along EF, which consists of three pieces 24, 27 and 28 assembled by sewing with shaving. Due to the imprecision of the cut for each of the pieces to be assembled and also due to the assembly zones 25 and 26, there are significant differences from one piece to another for the same EF edge to be treated.
  • the counting device 30 is programmed to count the number of stitches either from the start E of the seam. but from point H. The imprecision is therefore limited to the deviation only on the length HF (and no longer EF).
  • the point H at the start of counting is identified by the detection system, according to the oscillations of the active guide 9.
  • the bottom 24 of the pants consists of two pieces of knitted fabric and therefore has a thickness twice that of the back 28; thus the passage of the rollers 12 of the active guide 9 from the bottom 24 to the back 28 creates a downward movement of the active guide 9, movement which is detected by the displacement of the reflector 31 in front of the photoelectric sensor 32: the signal obtained authorizes the start of the counting of points by the device 30.
  • the installation comprises, in addition to the sensor 30 placed at the upper part of the needle bar 4 ', a differential claw 34.
  • this claw is placed upstream of the needle 4 and is driven by a movement allowing the workpiece 1 to advance at a speed greater than, equal to or less than that of the claw 33.
  • the differential claw 34 is controlled by the counting device 30.
  • This particular arrangement is used in particular when the piece 1 to be treated is a knitted fabric which will tend to deform during treatment. This deformation is compensated by the operator when sewing is carried out manually, it will be done, in automatic operation, thanks to variations in adjustment of the differential prong programmed according to the number of stitches counted by the sensor 30.
  • the border strip EF can be divided approximately in three parts as a function of the direction of the rows and of the columns of meshes: the part E1 whose direction is substantially parallel to the rows of meshes, the part IH whose direction is substantially perpendicular to the rows of meshes (and therefore parallel to the columns mesh) and the HF part whose direction is oblique to the mesh columns.
  • the sensor 30 is preprogrammed to start counting the number of stitches from point E, the start of sewing of each piece 1, and to successively control a linear speed of the differential gripper 34 significantly greater than that of the gripper 33 from 0 to 50 points, equal to that of the gripper 33 from 51 to 185 points and slightly higher than that of the brand 33 from 186 to 300 points.
  • the variation of the linear speed of the differential shoe 34 is obtained by changing the amplitude of the horizontal movement of said shoe.
  • the bottom 24 of the briefs (FIG. 3a) consists of two layers of knitting, the sewing edges 45 of which are adjusted during the mounting of this bottom 24 with the front 27 and the back 28 of the article.
  • the active guide 9 When this part 24 is subjected to the action of the active guide 9, the latter comes into contact with the upper layer and drives it transversely to the sewing direction according to the method described above. But the upper layer sliding more easily on the lower layer, than the latter slides on the fixed part 6 of the work table, this lower layer does not follow the movement imposed by the active guide 9. This results in a shift of the two sewing edges which is inadmissible.
  • a second active guide, lower 42 can complete the action of the upper guide 9 (FIG. 4).
  • This second guide 42 is identical to guide 9. It is placed under the fixed part 6 of the work table and emerges a few millimeters through the recess 43. Its rotation is obtained by motor means 46 similar to those of guide 9 and by a set of pulleys and belt 44 and 40.
  • a flexible blade 41 integral with the frame exerts a pressure above the knitted fabric in the direction of the table 6 in order to apply the lower layer of knitted fabric against the active guide 42.
  • the rotation of the active guides 9 and 42 is controlled by the same information received from the detectors 15 and 16.
  • the two guides therefore act simultaneously, the upper guide 9 rotating in the trigonometric direction and the lower guide 42 in the opposite direction or vice versa.
  • Each guide acts on a thickness of knitting and displaces it by the same amount. As a result, the edge-to-edge adjustment is maintained.
  • the motor means of the turntable 7 allow said drive to be driven at two different speeds, which allows accelerating in certain cases the corrections on the upstream part of the part 1.
  • the sewing machine 2 also has a normal speed and a slow speed, the latter being advantageously used in the event of a particularly pronounced curvature to be corrected.
  • Table 2 in appendix It gives an example of a program for controlling the two recentering means and the sewing machine 2 as a function of the information emitted by the three detectors 14, 15, 16.
  • the speed of the motor means by using an uppercase letter for high speed and a lowercase letter for low speed.
  • the arrangement of the different means with respect to each other is as follows. Taking sewing point 4 as the origin and seam line AA 'as the reference axis, the three detectors 14, 15 and 16 are located respectively 40, 32 and 70 millimeters from the needle and 5.2 and 30 millimeters from the seam axis AA '.
  • the active guide 9 has an outside diameter of 24 millimeters, each of the ten rollers has a diameter of 8 millimeters.
  • the axis of rotation 11 of the active guide 9 makes an angle of 35 "with the work table 6.
  • the point of contact of the active guide 9 with the work table 6 is on the seam line AA ', 45 mm from the needle 4.
  • the fixed part 6, inside the turntable 7, has a diameter of 480 millimeters, its center being located on the perpendicular to the sewing axis AA 'passing through the sewing point 4 at a distance of 200
  • the speed of the sewing machine 2 in normal operation is 4,170 revolutions per minute, in idle operation of 2,000 revolutions per minute.
  • the mat is associated with motor means, allowing its movement in both directions; it is directed either transversely to the seam axis AA ', or obliquely to said axis, in this in this case it ensures the centering of the part and also it facilitates the advancement of the part 1 towards the sewing head 4.
  • This latter arrangement is particularly advantageous in the case of a heavier part.

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

Description

La présente invention concerne une installation pour le traitement linéaire, tel que la couture, suivant une ligne dont la direction reste sensiblement parallèle à un bord d'une pièce souple telle qu'une pièce textile , du type comprenant:

  • une machine de traitement linéaire à poste fixe ayant un point de traitement fixe, telle qu'une machine à coudre;
  • un dispositif d'entraînement pour déplacer, par rapport à la machine de traitement, la zone en cours de traitement de cette pièce, suivant un axe prédéterminé, dit axe de traitement, tel que la griffe et le pied-presseur d'une machine à coudre;
  • une table de travail s'étendant autour dudit dispositif d'entraînement, cette table étant située sensiblement au niveau dudit point de traitement, et étant destinée à supporter la pièce durant son traitement;
  • un dispositif de correction comprenant un dispositif de détection de présence de la pièce et des moyens dits de recentrage commandés par ledit dispositif de détection pour déplacer la pièce sensiblement transversalement par rapport à l'axe de traitement et dans un sens convenable, en fonction de la position de la pièce, afin que ladite pièce soit traitée par la machine de traitement suivant une ligne s'étendant sensiblement parallèlement au bord de cette pièce.
The present invention relates to an installation for linear processing, such as sewing, along a line the direction of which remains substantially parallel to an edge of a flexible piece such as a textile piece, of the type comprising:
  • a stationary linear processing machine having a fixed processing point, such as a sewing machine;
  • a drive device for moving, with respect to the treatment machine, the zone being treated of this part, along a predetermined axis, called the treatment axis, such as the claw and the presser foot of a to sew;
  • a work table extending around said drive device, this table being situated substantially at said treatment point, and being intended to support the part during its treatment;
  • a correction device comprising a device for detecting the presence of the part and so-called refocusing means controlled by said detection device to move the part substantially transversely with respect to the processing axis and in a suitable direction, depending on the position of the part, so that said part is treated by the treatment machine along a line extending substantially parallel to the edge of this part.

Dans une installation de ce type, connue par le brevet français FR-A-2 252 008, les moyens de recentrage sont constitués par un carrousel mobile en rotation au-dessus de la table de travail et du bâti de la machine de traitement, ce carrousel comportant plusieurs patins susceptibles de venir s'appliquer sur la pièce en cours de traitement. Une telle installation est compliquée et nécessite un maintien à plat sans pli de la pièce sur la table de travail, en cours de traitement.In an installation of this type, known from French patent FR-A-2 252 008, the refocusing means consist of a carousel movable in rotation above the work table and the frame of the processing machine, this carousel with several pads that can be applied to the part being processed. Such an installation is complicated and requires the workpiece to be held flat without folds on the work table, during treatment.

Dans une autre installation de ce type, connue par le brevet français FR-A-2 457 920, les moyens de recentrage comprennent une partie de la table de travail mobile en rotation autour d'un axe qui lui est perpendiculaire, et des moyens moteurs commandés par le dispositif de détection pour entraîner en rotation ladite partie mobile dans un sens convenable en fonction de la position de la pièce. Cette installation est prévue principalement pour le traitement linéaire le long d'un bord courbe, présentant une courbure régulière, par exemple un slip masculin; elle ne convient pas au traitement de pièces présentant des profils variés, par exemple une courbure successivement convexe puis concave, ni au traitement de pièces de dimensions réduites.In another installation of this type, known from French patent FR-A-2 457 920, the recentering means comprise a part of the working table movable in rotation about an axis which is perpendicular thereto, and motor means controlled by the detection device to rotate said movable part in a suitable direction depending on the position of the part. This installation is mainly intended for linear treatment along a curved edge, having a regular curvature, for example a male panty; it is not suitable for the treatment of parts having various profiles, for example a successively convex then concave curvature, nor for the treatment of parts of reduced dimensions.

  • Or on a trouvé, et c'est ce qui fait l'objet de l'invention, une installation du type précité qui pallie les inconvénients constatés. Les moyens de recentrage de l'installation selon l'invention comportent deux moyens distincts: un guide actif, placé à proximité du dispositif d'entraînement de la machine de traitement, en amont de celui-ci et de préférence sur l'axe de traitement ou du côté intérieur de la pièce par rapport à l'axe dans la direction de déplacement de la pièce en cours de traitement, ledit guide assurant le déplacement rediligne de la partie de la pièce située près du point de traitement, sensiblement transversalement par rapport à l'axe de traitement, etHowever, we have found, and this is the subject of the invention, an installation of the aforementioned type which overcomes the drawbacks noted. The means for refocusing the installation according to the invention comprise two distinct means: an active guide, placed near the drive device of the treatment machine, upstream of it and preferably on the treatment axis or on the inner side of the part with respect to the axis in the direction of movement of the part being treated, said guide ensuring the redilinear movement of the part of the part located near the point of treatment, substantially transversely to the processing axis, and
  • un support mobile, placé en amont du guide actif, présentant une surface plane, mobile, sur le même plan que la table de travail, assorti de moyens moteurs pour entraîner le déplacement de ladite surface, ledit support assurant le déplacement de la partie amont de la pièce, eta mobile support, placed upstream of the active guide, having a flat, mobile surface, on the same plane as the work table, with motor means for driving the movement of said surface, said support ensuring the movement of the upstream part of the room, and
  • le guide actif et les moyens moteurs du support mobile sont commandés, ensemble ou indépendamment l'un de l'autre, par les instructions données par le dispositif de détection.the active guide and the motor means of the mobile support are controlled, together or independently of one another, by the instructions given by the detection device.

Dans la présente description, l'amont et l'aval ainsi que la droite et la gauche sont à situer par rapport au déplacement de la pièce au cours de son traitement. De plus la notion de droite et gauche est à considérer comme dépendante du caractère droit ou gauche de la machine de traitement elle-même, ou de la façon de placer la pièce et son bord par rapport à ladite machine. Ainsi la pièce à traiter passera d'abord sur le support mobile, qui est le plus en amont, puis sous le guide actif avant d'être introduit sous le dispositif d'entraînement de la machine de traitement. Suivant la position de la pièce sur la table de travail lors de son introduction puis de son traitement, le dispositif de détection commandera le recentrage de la pièce par déplacement, soit du seul guide actif, soit du seul support mobile soit de ces deux moyens en même temps dans la même direction voire même dans des directions opposées. Par rapport aux installations existantes, l'installation selon l'invention permet un recentrage beaucoup plus précis grâce à la combinaison des deux moyens distincts, qui peuvent agir soit ensemble soit indépendamment l'un de l'autre en fonction de la position de la pièce et de sa forme.In the present description, the upstream and downstream as well as the right and the left are to be situated in relation to the movement of the part during its treatment. In addition, the notion of right and left is to be considered as dependent on the right or left character of the processing machine itself, or on the way of placing the part and its edge relative to said machine. Thus, the part to be treated will first pass over the mobile support, which is most upstream, then under the active guide before being introduced under the drive device of the treatment machine. Depending on the position of the part on the work table during its introduction and then its treatment, the detection device will control the refocusing of the part by displacement, either of the only active guide, or of the only movable support or of these two means. same time in the same direction or even in opposite directions. Compared to existing installations, the installation according to the invention allows a much more precise refocusing thanks to the combination of the two distinct means, which can act either together or independently of one another depending on the position of the part. and its shape.

Préférentiellement le dispositif de détection comprend trois détecteurs:

  • le premier et le deuxième étant situés entre le dispositif d'entraînement de la machine de traitement et le guide actif, de part et d'autre et très peu éloignés d'une ligne de référence, parallèle à l'axe de traitement et tangente au bord de la pièce au point de traitement,
  • et le troisième étant situé en amont du guide actif, à droite et sensiblement éloigné de ladite ligne de référence.
Preferably, the detection device comprises three detectors:
  • the first and the second being located between the drive device of the treatment machine and the active guide, on both sides and very little distant from a reference line, parallel to the treatment axis and tangent to the edge of the workpiece at the point of treatment,
  • and the third being located upstream of the active guide, to the right and substantially distant from said reference line.

Pour le cas où l'on est amené à traiter des pièces dont le bord à traiter présente une courbure convexe, le dispositif de détection comprendra avantageusement quatre détecteurs, le quatrième étant situé en amont du guide actif, à gauche et sensiblement éloigné de la ligne de référence.In the case where it is necessary to treat parts whose edge to be treated has a convex curvature, the detection device will advantageously include four detectors, the fourth being located upstream of the active guide, to the left and substantially distant from the line reference.

Dans une réalisation préférée de l'invention, les deux premiers détecteurs sont placés symétriquement par rapport à la ligne de référence, de même. lorsque le dispositif de détecteur comprend quatre détecteurs, le troisième et le quatrième détecteurs sont placés symétriquement par rapport à la ligne de référence.In a preferred embodiment of the invention, the first two detectors are placed symmetrically with respect to the reference line, likewise. when the detector device comprises four detectors, the third and the fourth detectors are placed symmetrically with respect to the reference line.

Le guide actif consiste en un organe s'appliquant sur la pièce et la déplaçant en la faisant glisser sur la table de travail. Avantageusement il consiste en un organe rotatif venant en contact avec la pièce et tournant autour d'un axe situé dans un plan vertical sensiblement parallèle à l'axe de traitement, ledit organe rotatif comportant sur sa périphérie plusieurs éléments identiques, destinés à venir en contact avec la pièce, chacun desdits éléments ayant la forme d'un disque, étant libre en rotation et étant placé dans un plan radial par rapport à l'axe de rotation de l'organe rotatif. La présence des disques, sur la périphérie de l'organe rotatif et en contact avec la pièce, permet lors de la rotation dudit organe de déplacer transversalement la pièce par rapport à l'axe de traitement, tout en limitant les frottements lors de l'avance de la pièce grâce à la rotation desdits disques sur eux-mêmes.The active guide consists of a member that applies to the workpiece and moves it by sliding it on the work table. Advantageously, it consists of a rotary member coming into contact with the part and rotating around an axis situated in a vertical plane substantially parallel to the processing axis, said rotary member comprising on its periphery several identical elements, intended to come into contact with the part, each of said elements having the shape of a disc, being free to rotate and being placed in a radial plane relative to the axis of rotation of the rotary member. The presence of the discs, on the periphery of the rotary member and in contact with the workpiece, allows during the rotation of said member to move the workpiece transversely relative to the treatment axis, while limiting friction during the advancement of the part thanks to the rotation of said discs on themselves.

Le support mobile peut consister en une partie de la table de travail, mobile en rotation autour d'un axe perpendiculaire, comme décrit dans le brevet français FR-A-2 457 920. Il peut également consister en un tapis sans fin dont le brin supérieur est placé dans le plan de la table de travail et en continuation de celle-ci.The mobile support can consist of a part of the work table, mobile in rotation around a perpendicular axis, as described in French patent FR-A-2 457 920. It can also consist of an endless belt whose strand upper is placed in the plane of the work table and in continuation thereof.

Dans certains cas particuliers, l'installation de traitement linéaire décrite ci-dessus peut fonctionner de manière non encore appropriée. Par exemple, lorsque la fin du bord de la pièce souple à traiter présente un profil proche d'une portion de courbe, sans changement brusque de direction, les moyens de recentrage suivent automatiquement le bord de la pièce sans que le traitement ne s'arrête effectivement à l'endroit souhaité pour la fin de traitement. Dans un autre exemple, dans le cas de pièces souples réalisées en tricots et de traitement entraînant une rotation importante de la pièce en cours de traitement, il se produit une déformation du tricot en cours de traitement selon que la partie sous le pied-presseur se présente dans le sens des colonnes de mailles ou en travers de ces colonnes pour atteindre éventuellement le sens rangées; cette déformation influe sur le traitement et est difficilement contrôlable à l'aide de l'installation décrite ci-dessus.In certain particular cases, the linear processing installation described above can operate in a manner which is not yet appropriate. For example, when the end of the edge of the flexible part to be treated has a profile close to a portion of a curve, without abrupt change of direction, the refocusing means automatically follow the edge of the part without the treatment stopping. actually at the desired location for the end of treatment. In another example, in the case of flexible pieces made of knits and of treatment resulting in a significant rotation of the piece during treatment, there is a deformation of the knitted fabric during treatment depending on whether the part under the presser foot is present in the direction of the mesh columns or across these columns to possibly reach the row direction; this deformation influences the treatment and is difficult to control using the installation described above.

Pour pallier ces inconvénients, on adjoint à l'installation décrite un dispositif de comptage. Le dispositif de comptage est destiné à donner une valeur numérique au traitement le long du bord de la pièce. Il s'agira, en particulier, du comptage des points pour la couture ou le bordage le long de la lisière d'une pièce textile. Dans ce dernier cas, le comptage est obtenu par la détection du mouvement alternatif de la barre à aiguilles de la machine à coudre: le dispositif de comptage comprend alors un détecteur, qui compte les oscillations de la barre à aiguilles.To overcome these drawbacks, a counting device is added to the installation described. The counting device is intended to give a numerical value to the treatment along the edge of the part. In particular, this will involve counting stitches for sewing or planking along the edge of a textile piece. In the latter case, counting is obtained by detecting the reciprocating movement of the needle bar of the sewing machine: the counting device then comprises a detector, which counts the oscillations of the needle bar.

Selon un premier mode de réalisation du dispositif de comptage, il commande l'action des moyens de recentrage de telle sorte que l'arrêt des moyens moteurs du plateau tournant et la levée du guide actif sont commandés dès que le dispositif de comtage à enregistré une valeur numérique donnée, fonction de la longueur du bord à traiter de la pièce souple. La valeur numérique, dans le cas d'une couture d'un certain type, peut correspondre au nombre de points nécessaires pour réaliser la couture sur une distance légèrement inférieure à la longueur totale du bord à coudre. Ainsi le dispositif de comptage enregistre, pour chaque pièce, le nombre de points réalisé par la machine à coudre depuis le début de la couture. La valeur numérique peut correspondre au nombre de points nécessaires pour réaliser la couture sur une certaine distance, entre un point repérable et la fin du bord à coudre. Ce point repérable sera par exemple la limite d'une surêpaisseur repérable grâce à un système de détection du type réflecteur monté sur le guide actif placé en regard d'un capteur photo-électrique. Lorsque le nombre compté atteint la valeur donnée, le dispositif de comptage commande l'arrêt des moyens moteurs du plateau tournant et la levée du guide actif qui de ce fait perd le contact avec la pièce à coudre; la couture se poursuit linéairement le long du bord de la pièce , sans que celle-ci soit déplacée par les moyens de recentrage. Cette disposition particulière répond bien à la difficulté rencontrée pour faire échapper la fin de la lisière à coudre au contrôle des moyens de recentrage lorsque ladite lisière présente un profil proche d'une portion de courbe. A titre de sécurité, on adjoint au dispositif de comptage un guide-butée escamotable, commandé par le dispositif de comptage. La surface de guidage de ce guide-butée est, en position service, positionnée à une distance de la ligne de traitement qui correspond approximativement à la largeur de la pièce nécessaire entre la ligne de traitement et le bord de la pièce. Le dispositif de comptage commande la mise en service du guide-butée et donc le déplacement de la surface de guidage vers la position décrite ci-dessus, simultanément à la levée du guide actif. Ainsi la fin du traitement, après retrait du guide actif, est effectuée alors que le bord est guidé par la surface de guidage du guide-butée.According to a first embodiment of the counting device, it controls the action of the recentering means so that the stopping of the motor means of the turntable and the lifting of the active guide are controlled as soon as the counting device has recorded a numerical value given, function of the length of the edge to be treated of the flexible part. The numerical value, in the case of a seam of a certain type, can correspond to the number of stitches necessary to carry out the seam over a distance slightly less than the total length of the edge to be sewn. Thus the counting device records, for each piece, the number of stitches made by the sewing machine since the start of sewing. The numerical value can correspond to the number of stitches necessary to carry out sewing over a certain distance, between a locatable stitch and the end of the edge to be sewn. This locatable point will for example be the limit of a locatable excess thickness thanks to a reflector type detection system mounted on the active guide placed opposite a photoelectric sensor. When the number counted reaches the given value, the counting device controls the stopping of the motor means of the turntable and the lifting of the active guide which thereby loses contact with the workpiece; the seam continues linearly along the edge of the workpiece, without it being moved by the centering means. This particular arrangement responds well to the difficulty encountered in making the end of the sewing selvedge escape from the control of the refocusing means when said selvedge has a profile close to a portion of the curve. For security, we add to the counting device a retractable stop guide, controlled by the counting device. The guide surface of this abutment guide is, in the service position, positioned at a distance from the treatment line which corresponds approximately to the width of the part required between the treatment line and the edge of the part. The counting device controls the commissioning of the stop guide and therefore the movement of the guide surface towards the position described above, simultaneously with the lifting of the active guide. Thus, the end of the treatment, after removal of the active guide, is carried out while the edge is guided by the guide surface of the stop guide.

Selon un second mode de réalisation, le dispositif d'entraînement pour déplacer par rapport à la machine de traitement, la zone en cours de traitement de la pièce suivant l'axe de traitement comporte des moyens pour faire varier l'avance de la pièce devant le point de traitement, lesdits moyens étant commandés par le dispositif de comptage.According to a second embodiment, the drive device for moving, with respect to the treatment machine, the zone being treated of the part along the axis of treatment comprises means for varying the advance of the part in front the processing point, said means being controlled by the counting device.

En particulier, dans le cas d'une couture, la machine à coudre comporte une griffe différentielle dont le réglage est commandé en cours de couture par le dispositif de comptage. Ce mode de réalisation est particulièrement bien adapté pour contrôler la déformation d'un tricot pendant la couture. Ainsi pour un type de pièce donné, dont on connaît l'emplacement des colonnes de mailles par rapport au bord à coudre, on prédétermine le réglage de la griffe différentielle en fonction de la déformation attendue du tricot au cours de la couture; et le réglage en cours de couture est commandé par le dispositif de comptage en fonction du nombre de points comptés depuis le début de la couture.In particular, in the case of sewing, the sewing machine has a differential shoe, the adjustment of which is controlled during sewing by the counting device. This embodiment is particularly well suited for controlling the deformation of a knitted fabric during sewing. Thus, for a given type of piece, the location of the mesh columns of which is known with respect to the edge to be sewn, the differential claw adjustment is predetermined as a function of the expected deformation of the knitting during sewing; and the adjustment during sewing is controlled by the counting device as a function of the number of stitches counted since the start of sewing.

L'invention sera mieux comprise à la lecture de la description qui va suivre et du dessin annexé dans lequel:

  • la figure 1 représente une vue schématique de l'installation de guidage d'une pièce textile devant une machine à coudre, équipée d'un guide-butée,
  • la figure 2 est une coupe schématique de la figure 1 selon l'axe XX',
  • Les figures 3a et 3b sont des illustrations différentes de pièces textiles dont le bord à traiter ne présente pas un changement brusque de direction,
  • la figure 4 est une vue schématique en coupe de l'installation,
  • la figure 5 représente une vue schématique en perspective d'un guide actif.
The invention will be better understood on reading the description which follows and the appended drawing in which:
  • FIG. 1 represents a schematic view of the installation for guiding a textile piece in front of a sewing machine, equipped with a stop guide,
  • FIG. 2 is a diagrammatic section of FIG. 1 along the axis XX ',
  • FIGS. 3a and 3b are different illustrations of textile pieces whose edge to be treated does not show a sudden change in direction,
  • FIG. 4 is a schematic sectional view of the installation,
  • Figure 5 shows a schematic perspective view of an active guide.

L'installation est destinée à border des pièces textiles 1 en cours de confection, par exemple à élastiquer ou colleter des slips le long d'une entrée de jambe. Cette installation comprend une machine à coudre 2, spécialement équipée pour réaliser l'opération de bordage, avec son dispositif d'entraînement comprenant une griffe 33 et un pied-presseur 3, et l'aiguille 4 qui réalise la couture selon laxe de couture AA'. La couture doit être réalisée à une certaine distance e du bord 5 à coudre. Au point de couture, le bord de la pièce 1 est situé selon l'axe BB', parallèle à l'axe de couture AA' et éloigné de celui-ci de la distance e vers la droite dans le sens de l'avance de la pièce 1 en cours de bordage.The installation is intended to border textile pieces 1 during manufacture, for example to elasticize or glue briefs along a leg entry. This installation comprises a sewing machine 2, specially equipped for carrying out the planking operation, with its drive device comprising a claw 33 and a presser foot 3, and the needle 4 which carries out the sewing along the sewing axis AA '. The seam must be made at a certain distance e from the edge 5 to be sewn. At the point of sewing, the edge of the piece 1 is located along the axis BB ', parallel to the sewing axis AA' and distant from it by the distance e to the right in the direction of advance of room 1 during planking.

Autour de la machine à coudre 2, la table de travail 6 supporte la pièce 1 tout au long et après l'opération de bordage. Une partie 7 de la table 6 est mobile en rotation autour de l'axe 8 qui lui est perpendiculaire: cette partie mobile que nous appelons plateau tournant a une forme annulaire, entourant la machine à coudre 2 et une partie fixe de la table de travail 6. Le plateau tournant est entraîné dans un sens ou dans l'autre par des moyens moteurs non représentés.Around the sewing machine 2, the work table 6 supports the piece 1 throughout and after the planking operation. A part 7 of the table 6 is movable in rotation around the axis 8 which is perpendicular thereto: this mobile part which we call turntable has an annular shape, surrounding the sewing machine 2 and a fixed part of the work table 6. The turntable is driven in one direction or the other by motor means not shown.

Le guide actif 9 est positionné en amont du pied-presseure 3, à gauche de la ligne de référence BB' et au droit de la partie fixe 6 de la table de travail. Ce guide 9, comme l'illustre la figure 5, est constitué d'un organe rotatif 10 tournant autour d'un axe 11 et supportant sur sa périphérie dix disques 12, libres en rotation dans des évidements 13 pratiqués radialement dans l'organe 10. Il est placé au dessus de la table 6 de telle sorte qu'il s'appuie sur la pièce 1 pendant le bordage et que le plan perpendiculaire à la table 6 passant par son axe de rotation 11 soit parallèle à l'axe de couture AA'. L'action de déplacement transversal des disques 12 pendant la rotation de l'organe 10 s'effectue selon la ligne CC'perpendiculaire à l'axe de traitement AA' en une zone 17 située à une distance D3 de la ligne de référence BB'. La distance D3 est fonction du comportement de l'étoffe constituant la pièce 1 et également du rayon de courbure minimum de la pièce; en tout état de cause D3 doit être suffisante pour le guide actif 9 soit toujours en contact avec la pièce 1 au cours de l'opération de bordage, tant que celle-ci n'a pas dépassé la ligne CC'.The active guide 9 is positioned upstream of the presser foot 3, to the left of the reference line BB 'and to the right of the fixed part 6 of the work table. This guide 9, as illustrated in FIG. 5, consists of a rotary member 10 rotating around an axis 11 and supporting on its periphery ten discs 12, free to rotate in recesses 13 formed radially in the member 10 It is placed above the table 6 so that it rests on the piece 1 during the planking and that the plane perpendicular to the table 6 passing through its axis of rotation 11 is parallel to the seam axis. AA '. The action of transverse displacement of the discs 12 during the rotation of the member 10 takes place along the line CC'perpendicular to the processing axis AA 'in a zone 17 located at a distance D3 from the reference line BB' . The distance D3 is a function of the behavior of the fabric constituting the piece 1 and also of the minimum radius of curvature of the piece; in any event D3 must be sufficient for the active guide 9 to always be in contact with the part 1 during the planking operation, as long as the latter has not exceeded the line CC ′.

Deux détecteurs photo-électriques 14 et 15 sont placés de part et d'autre de la ligne de référence BB' dans un plan perpendiculaire à ladite ligne située entre le pied-presseur 3; l'un 14 à droite, l'autre 15 à gauche de la ligne BB', ils sont placés symétriquement par rapport à ladite ligne et leur écartement définit la largeur de la zone de guidage correcte et est fonction de la distance e admise pour l'opération de bordage. Un autre détecteur photo-électrique 16 est placé à droite de la ligne BB' en amont du guide actif 9: il est éloigné de la ligne BB' d'une distance D1 qui est beaucoup plus grande que celle existant entre le détecteur 14 et la ligne BB' et qui est fonction du rayon de courbure minimum de la pièce 1 à border: plus la courbure du bord à traiter est importante et plus grande sera la distance D1. Chacun des trois détecteurs 14, 15, 16 est conçu pour émettre un signal lorsque la pièce 1 est présente au-dessus de lui. Les informations émises par les trois détecteurs, de présence ou d'absence de la pièce 1 à chacune de leur position, permettent de connaître la position exacte de la pièce 1 devant la tête de couture, et de commander le plateau tournant 7 et/ou le guide actif 9 pour orienter la pièce 1 tout au long de son bordage, selon un programme prédéterminé.Two photoelectric detectors 14 and 15 are placed on either side of the reference line BB 'in a plane perpendicular to said line located between the presser foot 3; one 14 to the right, the other 15 to the left of line BB ', they are placed symmetrically with respect to said line and their spacing defines the width of the correct guide zone and is a function of the distance e allowed for l planking operation. Another photoelectric detector 16 is placed to the right of the line BB 'upstream of the active guide 9: it is distant from the line BB' by a distance D1 which is much greater than that existing between the detector 14 and the line BB 'and which is a function of the minimum radius of curvature of the part 1 to be bordered: the greater the curvature of the edge to be treated and the greater the distance D1. Each of the three detectors 14, 15, 16 is designed to emit a signal when the part 1 is present above it. The information sent by the three detectors, of the presence or absence of the piece 1 at each of their positions, makes it possible to know the exact position of the piece 1 in front of the sewing head, and to control the turntable 7 and / or the active guide 9 for orienting the part 1 all along its planking, according to a predetermined program.

Selon un premier mode de réalisation du dispositif de comptage, l'installation comporte un capteur 30 placé à la partie supérieure de la barre à aiguille 4' et capable de compter le nombre de mouvements «monte» et «baisse» de ladite barre 4' lors de l'opération de couture et donc le nombre de points de couture. Un vérin 18, solidaire de la machine à coudre 2, est relié au support 19 du guide actif 9. Celui-ci comporte un axe de rotation horizontal 21, permettant de lever et baisser la partie 10 du guide 9 sous l'action du vérin 18. La liaison entre la tige du vérin 18 et le support 19 du guide actif 9 est assurée par un câble souple 20; ainsi lorsque les roulettes 12 du guide 9 sont appliquées sur la pièce 1 le câble 20 est détendu et les roulettes 12 peuvent suivre les différences d'épaisseur que peut présenter la pièce 1 lors de son déplacement sur la table 6. De plus sur la table 6 est positionné un guide-butée 34 actionné par un vérin 35, fixé sur la table 6. Le guide-butée 34 présente une surface de guidage 36, contre laquelle vient prendre appui le bord à traiter de la pièce 1 lorsque le vérin 35 est sorti. Dans ce cas la surface de guidage 36 du guide-butée 34 est à une distance de la ligne de traitement AA' qui correspond approximativement à la largeur e nécessaire entre la ligne de traitement AA' et le bord de la pièce BB'. La surface de guidage 36 peut. comme illustré sur la figure 2, présenter une forme coudée 36' adaptée pour éviter que le bord à guider de la pièce 1 ne se soulève et donc le maintenir contre la table 6. Les vérins 18 et 35 sont commandés par le dispositif de comptage 30.According to a first embodiment of the counting device, the installation includes a sensor 30 placed at the top of the needle bar 4 'and capable of counting the number of movements “up” and “down” of said bar 4' during the sewing operation and therefore the number of sewing stitches. A jack 18, integral with the sewing machine 2, is connected to the support 19 of the active guide 9. The latter has a horizontal axis of rotation 21, making it possible to raise and lower the part 10 of the guide 9 under the action of the jack 18. The connection between the rod of the jack 18 and the support 19 of the active guide 9 is provided by a flexible cable 20; thus when the rollers 12 of the guide 9 are applied to the piece 1 the cable 20 is relaxed and the rollers 12 can follow the differences in thickness that the piece 1 may have when it moves on the table 6. Furthermore on the table 6 is positioned an abutment guide 34 actuated by a jack 35, fixed on the table 6. The abutment guide 34 has a guide surface 36, against which the edge to be treated of the part 1 comes to bear when the jack 35 is got out. In this case the guide surface 36 of the abutment guide 34 is at a distance from the treatment line AA 'which corresponds approximately to the width e necessary between the treatment line AA' and the edge of the part BB '. The guide surface 36 can. as illustrated in FIG. 2, present an angled shape 36 'adapted to prevent the edge to be guided of the piece 1 from lifting and therefore hold it against the table 6. The jacks 18 and 35 are controlled by the counting device 30 .

Le fontionnement de l'installation est le suivant La pièce 1 à border est placée sur le plateau tournant 7, puis l'angle par lequel doit commencer la couture est introduit sous le guide actif 9 et sous le pied-presseur 3. La machine à coudre 2 est mise en marche et le système griffe 33 - pied-presseur 3 entraîne la pièce 1 dans la direction de l'axe de couture AA'. Les trois opérations précédentes, placement de la pièce 1 sur le plateau 7, introduction sous le guide actif 9 et sous le pied-presseur 3, mise en marche de la machine à coudre 2 sont effectuées soit par un opérateur soit de manière automatique. Pendant le déroulement de l'opération de bordage, les moyens de recentrage que sont le guide actif 9 et le plateau tournant 7 vont, indépendamment l'un de l'autre ou simultanément, guider la pièce 1 de telle sorte que la couture s'effectue le long du bord 5, sensiblement parallèlement à celui-ci et à une distance e. L'action des moyens de recentrage est commandée par les informations reçues des détecteurs 14, 15, 16 selon un programme défini dont un exemple est donné en annexe 1. Les colonnes intitulées 14, 15, 16 définissent l'état de chaque détecteur selon que la pièce est présente (X) audessus dudit détecteur ou absente (-). La colonne intitulée «guide actif» définit soit l'inaction de l'organe rotatif 10 (0) soit sa rotation dans le sens entraînant la pièce 1 vers la droite (D) soit sa rotation dans le sens entraînant la pièce 1 vers la gauche (G). La colonne intitulée «plateau tournant» reprend les mêmes paramètres que la colonne précédente pour le plateau tournant 7. La partie droite du tableau illustre la position de la pièce par rapport aux détecteurs et l'action des moyens de recentrage: flèche f pour le guide actif 9 et flèche F pour le plateau 7.The operation of the installation is as follows. The piece 1 to be bordered is placed on the turntable 7, then the angle at which the seam must begin is introduced under the active guide 9 and under the presser foot 3. The sew 2 is on on and the claw system 33 - presser foot 3 drives the piece 1 in the direction of the sewing axis AA '. The three preceding operations, placing of the part 1 on the plate 7, introduction under the active guide 9 and under the presser foot 3, starting the sewing machine 2 are carried out either by an operator or automatically. During the course of the planking operation, the recentering means which are the active guide 9 and the turntable 7 will, independently of one another or simultaneously, guide the piece 1 so that the seam is performs along the edge 5, substantially parallel to the latter and at a distance e. The action of the refocusing means is controlled by the information received from the detectors 14, 15, 16 according to a defined program, an example of which is given in annex 1. The columns entitled 14, 15, 16 define the state of each detector according to whether the part is present (X) above said detector or absent (-). The column entitled “active guide” defines either the inaction of the rotary member 10 (0) or its rotation in the direction driving the part 1 to the right (D) or its rotation in the direction causing the part 1 to the left (G). The column titled “turntable” uses the same parameters as the previous column for the turntable 7. The right part of the table illustrates the position of the part relative to the detectors and the action of the recentering means: arrow f for the guide active 9 and arrow F for platform 7.

Dans le cas où la pièce 1 présente un bord EF à traiter et que ce bord, comme cela est illustré à la figure 3a, a au niveau du point F de fin de traitement un profil qui est proche d'une portion de courbe, sans changement brusque de direction, le fonctionnement de l'installation selon le premier mode de réalisation du dispositif de comptage est le suivant. Le dispositif 30 de comptage de points est programmé pour d'une part compter les points à compter du début de couture de chaque pièce 1 à traiter, d'autre part pour commander, lorsque le nombre de points compté par le dispositif 30 de comptage atteint une valeur donnée qui est fonction de chaque pièce, à la fois l'arrêt des moyens de recentrage, à savoir l'arrêt des moyens moteurs du plateau tournant 7 et l'action du vérin 18 qui lève le guide actif 9 et également l'action du vérin 35 qui avance le guide-butée 34 en position de service. A titre d'exemple, un slip, comme montré à la figure 3a, a une longueur à border EF égale à 50 cm. On désire interrompre l'action des moyens de recentrage lorsque la couture est réalisée selon la courbe EF', le point F' étant distant de 2 cm du point F qui marque la fin du pord à traiter. La densité de points obtenue par la machine à coudre 2 est de 5 points par centimètre. La valeur numérique donnée est égale au nombre de points pour parcourir la distance EF' soit 240 points. Ainsi, le guidage de la pièce 1 le long du bord EF' est obtenu grâce aux moyens de recentrage, plateau tournant 7 et guide actif 9, puis lorsque le dispositif 30 a compté 240 points et que donc le point F' est atteint, le dispositif 30 commande d'une part le retrait du vérin 18 qui entraîne la levée du guidage actif 9 et l'arrêt des moyens moteurs du plateau tournant 7 et d'autre part la sortie du vérin 35 qui présente la surface 36 du guide-butée en position de guidage le long du bord F'F à traiter. De la sorte la couture se poursuite le long de la courbe F'F et dans sa continuation (en pointillé sur la figure 3a) et non le long du bord FG.In the case where the part 1 has an edge EF to be treated and this edge, as illustrated in FIG. 3a, has at the level of the point F of end of treatment a profile which is close to a portion of the curve, without sudden change of direction, the operation of the installation according to the first embodiment of the counting device is as follows. The stitch counting device 30 is programmed to count the stitches on the one hand from the start of sewing of each piece 1 to be treated, and on the other hand to order, when the number of stitches counted by the counting device 30 has been reached. a given value which is a function of each part, both the stopping of the refocusing means, namely the stopping of the motor means of the turntable 7 and the action of the jack 18 which lifts the active guide 9 and also the action of the jack 35 which advances the stop guide 34 into the service position. For example, a pair of briefs, as shown in Figure 3a, has a border length EF equal to 50 cm. It is desired to interrupt the action of the recentering means when the seam is produced according to the curve EF ′, the point F ′ being 2 cm from the point F which marks the end of the pord to be treated. The stitch density obtained by the sewing machine 2 is 5 stitches per centimeter. The numerical value given is equal to the number of points to cover the distance EF ', ie 240 points. Thus, the guiding of the part 1 along the edge EF 'is obtained by means of recentering, turntable 7 and active guide 9, then when the device 30 has counted 240 points and that therefore the point F' is reached, the device 30 controls on the one hand the withdrawal of the jack 18 which causes the active guide 9 to be lifted and the motor means of the turntable 7 to stop and on the other hand the outlet of the jack 35 which has the surface 36 of the stop guide in the guide position along the edge F'F to be treated. In this way the seam continues along the curve F'F and in its continuation (in dotted lines in FIG. 3a) and not along the edge FG.

Dans une variante de ce premier mode de réalisation du dispositif de comptage, le guide actif 9 comporte un système de détection des oscillations auxquelles sont soumises les roulettes 12 lors des variations d'épaisseur de la pièce 1. Ce système de détection comprend un réflecteur 31. solidaire du support 19 du guide actif 9, et un capteur photo-électrique 32. Cette disposition particulière convient notamment lorsque la pièce à traiter est constituée d'éléments assemblés par couture et présentant de ce fait des surépaisseurs La figure 3b représente un slip, à border le long de EF, qui est constitué de trois morceaux 24, 27 et 28 assemblés par couture avec rasage. Du fait de l'imprécision de la coupe pour chacun des morceaux à assembler et également du fait des zones d'assemblage 25 et 26, il existe d'une pièce à l'autre des écarts de longueur importants pour le même bord EF à traiter; ces écarts nuisent à la précision du suivi du profil F'F, les moyens de recentrage étant arrêtés soit trop tôt, soit trop tard. Pour réduire cette dispersion, on programme le dispositif de comptage 30 pour compter le nombre de points non plus à partir du début E de la couture. mais à partir du point H. L'imprécision est donc limitée à l'écart sur la seule longueur HF (et non plus EF). Le point H de début de comptage est repéré grâce au système de détection, suivant les oscillations du guide actif 9. Le fond 24 du slip est constitué de deux pièces de tricot et a donc une épaisseur double de celle du dos 28; ainsi le passage des roulettes 12 du guide actif 9 du fond 24 au dos 28 crée un mouvement descendant du guide actif 9, mouvement qui est détecté par le déplacement du réflecteur 31 devant le capteur photo-électrique 32: le signal obtenu autorise le début du comptage de points par le dispositif 30.In a variant of this first embodiment of the counting device, the active guide 9 comprises a system for detecting the oscillations to which the rollers 12 are subjected during variations in thickness of the part 1. This detection system comprises a reflector 31 secured to the support 19 of the active guide 9, and a photoelectric sensor 32. This particular arrangement is suitable in particular when the part to be treated is made up of elements assembled by sewing and therefore having extra thicknesses FIG. 3b represents a panty, to border along EF, which consists of three pieces 24, 27 and 28 assembled by sewing with shaving. Due to the imprecision of the cut for each of the pieces to be assembled and also due to the assembly zones 25 and 26, there are significant differences from one piece to another for the same EF edge to be treated. ; these deviations affect the accuracy of monitoring the F'F profile, the refocusing means being stopped either too early or too late. To reduce this dispersion, the counting device 30 is programmed to count the number of stitches either from the start E of the seam. but from point H. The imprecision is therefore limited to the deviation only on the length HF (and no longer EF). The point H at the start of counting is identified by the detection system, according to the oscillations of the active guide 9. The bottom 24 of the pants consists of two pieces of knitted fabric and therefore has a thickness twice that of the back 28; thus the passage of the rollers 12 of the active guide 9 from the bottom 24 to the back 28 creates a downward movement of the active guide 9, movement which is detected by the displacement of the reflector 31 in front of the photoelectric sensor 32: the signal obtained authorizes the start of the counting of points by the device 30.

Selon un second mode de réalisation du dispositif de comptage, l'installation comporte, en plus du capteur 30 placé à la partie supérieure de la barre à aiguille 4', une griffe différentielle 34. De manière connue, cette griffe est placée en amont de l'aiguille 4 et est animée d'un mouvement permettant une avance de la pièce 1 à une vitesse supérieure, égale ou inférieure à celle de la griffe 33. La griffe différentielle 34 est commandée par le dispositif de comptage 30. Cette disposition particulière est utilisée notamment quand la pièce 1 à traiter est un tricot qui aura tendance à se déformer au cours du traitement. Cette déformation est compensée par l'opérateur quand la couture est réalisée manuellement, elle le sera, en fonctionnement automatique, grâce aux variations de réglage de la griffe différentielle préprogrammée en fonction du nombre de points comptés par le capteur 30. Si l'on considère le slip représenté sur la figure 3b, la lisière à border EF peut être divisée approximativement en trois parties en fonction de la direction des rangées et des colonnes de mailles: la partie El dont la direction est sensiblement parallèle aux rangées de mailles, la partie IH dont la direction est sensiblement perpendiculaire aux rangées de mailles (et donc parallèles aux colonnes de mailles) et la partie HF dont la direction est oblique par rapport aux colonnes de mailles. Lors de la couture le long du bord EF, le passage du tricot dans les organes d'entraînement de la machine à coudre provoque des extensions variables selon que la ligne de couture AA' est parallèle, perpendiculaire ou en oblique par rapport aux colonnes de mailles: par exemple le long de la partie El le tricot aura tendance à subir une forte extension lors de son passage sous les organes d'entraînement de la machine à coudre, le long de la partie 1 H aucune extension et le long de la partie H une extension plus faible. Si la distance EF est au total de 60 cm, avec El égal à 10 cm, IH à 27 cm et HF à 23 cm, et que la densité de points est de 5 points par centimètre, on préprogramme le capteur 30 pour commencer à compter le nombre de points à partir du point E, début de couture de chaque pièce 1, et pour commander successivement une vitesse linéaire de la griffe différentielle 34 nettement supérieure à celle de la griffe 33 de 0 à 50 points, égale à celle de la griffe 33 de 51 à 185 points et légèrement supérieure à celle de la griffe 33 de 186 à 300 points. La variation de la vitesse linéaire de la griffe différentielle 34 est obtenue par changement de l'amplitude du mouvement horizontal de ladite griffe.According to a second embodiment of the counting device, the installation comprises, in addition to the sensor 30 placed at the upper part of the needle bar 4 ', a differential claw 34. In known manner, this claw is placed upstream of the needle 4 and is driven by a movement allowing the workpiece 1 to advance at a speed greater than, equal to or less than that of the claw 33. The differential claw 34 is controlled by the counting device 30. This particular arrangement is used in particular when the piece 1 to be treated is a knitted fabric which will tend to deform during treatment. This deformation is compensated by the operator when sewing is carried out manually, it will be done, in automatic operation, thanks to variations in adjustment of the differential prong programmed according to the number of stitches counted by the sensor 30. If we consider the slip shown in Figure 3b, the border strip EF can be divided approximately in three parts as a function of the direction of the rows and of the columns of meshes: the part E1 whose direction is substantially parallel to the rows of meshes, the part IH whose direction is substantially perpendicular to the rows of meshes (and therefore parallel to the columns mesh) and the HF part whose direction is oblique to the mesh columns. When sewing along the edge EF, the passage of the knit in the drive members of the sewing machine causes variable extensions depending on whether the seam line AA 'is parallel, perpendicular or oblique with respect to the columns of stitches : for example along the part El the knitted fabric will tend to undergo a strong extension during its passage under the drive members of the sewing machine, along the part 1 H no extension and along the part H a weaker extension. If the distance EF is a total of 60 cm, with El equal to 10 cm, IH at 27 cm and HF at 23 cm, and the point density is 5 points per centimeter, the sensor 30 is preprogrammed to start counting the number of stitches from point E, the start of sewing of each piece 1, and to successively control a linear speed of the differential gripper 34 significantly greater than that of the gripper 33 from 0 to 50 points, equal to that of the gripper 33 from 51 to 185 points and slightly higher than that of the brand 33 from 186 to 300 points. The variation of the linear speed of the differential shoe 34 is obtained by changing the amplitude of the horizontal movement of said shoe.

Dans certains cas, des difficultés de guidage pourraient survenir avec des slips réalisés dans des tricots très glissants comme, par exemple, des dentelles fines ou des indémaillables pour slips féminins.In some cases, guidance difficulties could arise with briefs made in very slippery knits such as, for example, fine lace or non-ratchets for female briefs.

Le fond 24 du slip (figure 3a) est constitué de deux couches de tricot dont les bords à coudre 45 sont ajustés lors du montage de ce fond 24 avec le devant 27 et le dos 28 de l'article. Lorsque cette partie 24 est soumise à l'action du guide actif 9, celui-ci entre en contact avec la couche supérieure et l'entraîne transversalement à la direction de couture selon le procédé décrit plus haut. Mais la couche supérieure glissant plus facilement sur la couche inférieure, que celle-ci ne glisse sur la partie fixe 6 de la table de travail, cette couche inférieure ne suit pas le mouvement imposé par le guide actif 9. Il en résulte un décalage des deux bords à coudre qui est inadmissible.The bottom 24 of the briefs (FIG. 3a) consists of two layers of knitting, the sewing edges 45 of which are adjusted during the mounting of this bottom 24 with the front 27 and the back 28 of the article. When this part 24 is subjected to the action of the active guide 9, the latter comes into contact with the upper layer and drives it transversely to the sewing direction according to the method described above. But the upper layer sliding more easily on the lower layer, than the latter slides on the fixed part 6 of the work table, this lower layer does not follow the movement imposed by the active guide 9. This results in a shift of the two sewing edges which is inadmissible.

Pour pallier cet inconvénient, un second guide actif, inférieur 42, peut compléter l'action du guide supérieur 9 (figure 4). Ce second guide 42 est identique au guide 9. Il est placé sous la partie fixe 6 de la table de travail et émerge de quelques millimètres à travers l'évidement 43. Sa rotation est obtenue par des moyens moteurs 46 analogues à ceux du guide 9 et par un ensemble de poulies et courroie 44 et 40. Une lame flexible 41 solidaire du bâti exerce au-dessus du tricot une pression en direction de la table 6 afin d'appliquer la couche inférieure de tricot contre le guide actif 42.To overcome this drawback, a second active guide, lower 42, can complete the action of the upper guide 9 (FIG. 4). This second guide 42 is identical to guide 9. It is placed under the fixed part 6 of the work table and emerges a few millimeters through the recess 43. Its rotation is obtained by motor means 46 similar to those of guide 9 and by a set of pulleys and belt 44 and 40. A flexible blade 41 integral with the frame exerts a pressure above the knitted fabric in the direction of the table 6 in order to apply the lower layer of knitted fabric against the active guide 42.

La rotation des guides actifs 9 et 42 est commandée par les mêmes informations reçues des détecteurs 15 et 16. Les deux guides agissent donc simultanément, le guide supérieur 9 tournant dans le sens trigonométrique et le guide inférieur 42 dans le sens opposé ou inversement. Chaque guide agit sur une épaisseur de tricot et la déplace de la même quantité. De ce fait, l'ajustement bord à bord est maintenu.The rotation of the active guides 9 and 42 is controlled by the same information received from the detectors 15 and 16. The two guides therefore act simultaneously, the upper guide 9 rotating in the trigonometric direction and the lower guide 42 in the opposite direction or vice versa. Each guide acts on a thickness of knitting and displaces it by the same amount. As a result, the edge-to-edge adjustment is maintained.

Selon un mode particulier de réalisation de l'invention, les moyens moteurs du plateau tournant 7 permettent un entraînement dudit plateau selon deux vitesses différentes, ce qui autorise d'accélérer dans certains cas les corrections sur la partie amont de la pièce 1. De plus la machine à coudre 2 dispose également d'une vitesse normale et d'une vitesse ralentie, cette dernière étant avantageusement utilisée en cas de courbure particulièrement prononcée à corriger. Le tableau 2 en annexe Il donne un exemple de programme de commande des deux moyens de recentrage et de la machine à coudre 2 en fonction des informations émises par les trois détecteurs 14, 15, 16. Dans la colonne intitulée «plateau tournant» on a différencié la vitesse des moyens moteurs en utilisant une lettre majuscule pour la grande vitesse et une minuscule pour la petite vitesse.According to a particular embodiment of the invention, the motor means of the turntable 7 allow said drive to be driven at two different speeds, which allows accelerating in certain cases the corrections on the upstream part of the part 1. In addition the sewing machine 2 also has a normal speed and a slow speed, the latter being advantageously used in the event of a particularly pronounced curvature to be corrected. Table 2 in appendix It gives an example of a program for controlling the two recentering means and the sewing machine 2 as a function of the information emitted by the three detectors 14, 15, 16. In the column entitled “turntable” we have differentiated the speed of the motor means by using an uppercase letter for high speed and a lowercase letter for low speed.

Dans un exemple précis de réalisation, la dispositif des différents moyens les uns par rapport aux autres, est la suivante. En prenant comme origine le point de couture 4 et comme axe de repère la ligne de couture AA', les trois détecteurs 14, 15 et 16 sont situés respectivement à 40, 32 et 70 millimètres de l'aiguille et à 5,2 et 30 millimètres de l'axe de couture AA'. Le guide actif 9 a un diamètre extérieur de 24 millimètres, chacune des dix roulettes a un diamètre de 8 millimètres. L'axe de rotation 11 du guide actif 9 fait un angle de 35" avec la table de travail 6. Le point de contact du guide actif 9 avec la table de travail 6 est sur la ligne de couture AA', à 45 millimètres de l'aiguille 4. La partie fixe 6, intérieure au plateau tournant 7, a un diamètre de 480 millimètres, son centre étant situé sur la perpendiculaire à l'axe de couture AA' passant par le point de couture 4 à une distance de 200 millimètres de celui-ci. La vitesse de la machine à coudre 2 en marche normale est de 4.170 tours par minute, en marche ralentie de 2.000 tours par minute.In a specific embodiment, the arrangement of the different means with respect to each other is as follows. Taking sewing point 4 as the origin and seam line AA 'as the reference axis, the three detectors 14, 15 and 16 are located respectively 40, 32 and 70 millimeters from the needle and 5.2 and 30 millimeters from the seam axis AA '. The active guide 9 has an outside diameter of 24 millimeters, each of the ten rollers has a diameter of 8 millimeters. The axis of rotation 11 of the active guide 9 makes an angle of 35 "with the work table 6. The point of contact of the active guide 9 with the work table 6 is on the seam line AA ', 45 mm from the needle 4. The fixed part 6, inside the turntable 7, has a diameter of 480 millimeters, its center being located on the perpendicular to the sewing axis AA 'passing through the sewing point 4 at a distance of 200 The speed of the sewing machine 2 in normal operation is 4,170 revolutions per minute, in idle operation of 2,000 revolutions per minute.

L'exemple décrit ci-dessus est donné à titre d'illustration et n'est pas limitatif de l'invention On pourra par exemple utiliser d'autres types de guide actif, tel que celui décrit dans le brevet français FR-A-2 518 134, c'est-à-dire une roue de guidage dont l'axe de rotation est parallèle à l'axe de couture AA' et s'appliquant sur la pièce avec une pression modulable. On pourra utiliser d'autres types de support mobile, tel qu'un tapis sans fin dont la surface du brin supérieur, sur laquelle est placée la pièce 1 est dans le plan de la table de travail et en continuation de celle-ci. Le tapis est associé à des moyens moteurs, permettant son déplacement dans les deux sens; il est dirigé soit transversalement par rapport à l'axe de couture AA', soit en oblique par rapport audit axe, dans ce cas il assure le recentrage de la pièce et également il facilite l'avance de la pièce 1 vers la tête de couture 4. Cette dernière disposition est particulièrement avantageuse dans le cas de pièce plus lourde.The example described above is given by way of illustration and is not limitative of the invention. It is possible, for example, to use other types of active guide, such as that described in French patent FR-A-2. 518 134, that is to say a guide wheel whose axis of rotation is parallel to the seam axis AA ′ and which is applied to the part with a modular pressure. We can use other types of mobile support, such as an endless belt whose surface of the upper strand, on which is placed the part 1 is in the plane of the work table and in continuation thereof. The mat is associated with motor means, allowing its movement in both directions; it is directed either transversely to the seam axis AA ', or obliquely to said axis, in this in this case it ensures the centering of the part and also it facilitates the advancement of the part 1 towards the sewing head 4. This latter arrangement is particularly advantageous in the case of a heavier part.

On pourra ainsi mettre en oeuvre plus de trois détecteurs, par exemple en ajoutant un quatrième détecteur symétriquement au troisième par rapport à la ligne de référence BB'. Cette disposition complémentaire permet de recentrer très précisément les bords présentant les courbures convexes, telles que celle illustrée par la figure 4b. Dans ce cas, le plateau tournant 7 sera avantageusement animé de deux vitesses vers la droite.It will thus be possible to use more than three detectors, for example by adding a fourth detector symmetrically to the third with respect to the reference line BB '. This additional arrangement makes it possible to very precisely refocus the edges having the convex curvatures, such as that illustrated in FIG. 4b. In this case, the turntable 7 will advantageously be driven by two speeds to the right.

Annexe IAnnex I

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Annexe IlAnnex II

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Claims (20)

1. An installation for linear processing, e.g. sewing, along a line (AA') in a direction which remains substantially parallel to an edge (5) of a flexible article (1) such as a textile article, the installation being of the kind comprising:
- a stationary linear processing machine (2) having a stationary processing point (4), such as a sewing machine;
- a drive device for moving the processed area of the article relative to the processing machine (2) and along a predetermined axis, called the processing axis (AA'), such as the claw and presser foot (B) of a sewing machine;
- a work tabel (6, 7) extending around the drive device and situated substantially level with the processing point and adapted to hold the article (1) during processing thereof, and
- an adjusting device comprising a device (14, 15, 16) for detecting the presence of the article and also comprising «recentring» means actuated by the detection device so as to move the article substantially transversely with respect to the processing axis and in a suitable direction in dependence on the position of the article, so that the article is processed by the processing machine in a line extending substantially parallel to the edge of the article;
characterised in that the recentring means comprise two separate means:
- at least one active guide (9) disposed near the means (3) for driving the processing machine (2) and upstream thereof in the direction of motion of the article during treatment, the guide (3) being used for moving the part of the article situated near the processing point (4), the movement being in a straight line and substantially transversely to the processing axis, and
- a movable holder (7) disposed upstream of the active guide and having a flat surface movable in the same plane as the work table and associated with drive means for moving the aforementioned surface, the movable holder being used for moving the upstream part of the article, and the active guide (9) and the drive means of the movable holder are actuated together or independently by instructions given by the detection device (14, 15, 16).
2. An installation according to claim 1, characterised in that the active guide comprises a member (9) which acts on the article (1) and moves it by sliding it on the work table (6).
3. An installation according to claim 2, characterised in that the active guide comprises a rotary member (9) coming into contact with the article (1) and rotating around an axis (11) situated in a vertical plane substantially parallel to the processing axis (AA'), the periphery of the rotary member (9) bearing a number of identical components (12) adapted to come into contact with the article (1 ), each component (12) being a disc and freely rotatable and disposed in a radial plane with respect to the axis of rotation (11) of the rotary member.
4. An installation according to claim 1, characterised in that the movable holder comprises part of the work table (7) movable in rotation around an axis perpendicular thereto.
5. An installation according to claim 1, characterised in that the movable holder comprises an endless belt, the top run of which is situated in the plane of the work table and in continuation thereof.
6. An installation according to any of claims 1, 4 and 5, characterised in that the means for driving the movable holder (7) comprise at least two speeds in the two directions.
7. An installation according to any of claims 1 to 6, characterised in that the information given by the detection device (14, 15, 16) also controls the speed of the linear processing machine (2).
8. An installation according to claim 7, characterised in that the linear processing machine (2) has at least two operating speeds.
9. An installation according to claim 1, characterised in that the detection device comprises three detectors (14, 15, 16):
- the first (14) and the second (15) detector being situated between the means (3) for driving the processing machine (1) and the active guide (3), on either side of and very near a reference line (BB') parallel to the processing axis (AA') and touching the edge (5) of the article (1 ) at the processing point (4), and
- the third (16) being situated upstream of the active guide (9) to the right and at a substantial distance from the reference line (BB').
10. An installation according to claim 9, characterised in that the detection device comprises a fourth detector situated upstream of the active guide (9), to the left and at a substantial distance from the reference line (BB').
11. An installation according to any of claims 1 to 10, characterised in that it comprises two active guides (9, 42) respectively disposed above and below the work table (6, 7).
12. An installation according to any of claims 1 to 11, characterised in that it also comprises a counting device (30) adapted to give a numerical value to processing along the edge (5) of the article (1) and to actuate some members of the installation in dependence on the numerical value obtained.
13. An installation according to claim 12, characterised in that the counting device (30) is connected to the system of stopping the drive means of the turntable (7) and the system for raising the active guide (9).
14. An installation according to claim 13, characterised in that it comprises a system for detecting excess thickness and comprising a reflector (31 ) mounted on the holder (19) of the active guide (9) and also comprising a photo-electric pick-up (32) disposed facing the reflector (31 ) and adapted to detect a connecting point (H) along the processed edge of an article comprising at least two pieces (24, 28).
15. An installation according to claim 13 or 14, characterised in that it comprises a retractable abutment guide (34) actuated by the counting device (30) in such a manner that as soon as the numerical value reaches the given value, the guide surface (36) of the abutment guide (34) takes up position at a distance from the processing line (AA') approximately equal to the necessary width (e) of the article between the processing line (AA') and the edge (5) of the article (1), as a result of which the processed edge (5) is guided via the guide surface (36) of the abutment guide (34), after stopping the drive means of the rotating table (7) and raising the active guide (9).
16. An installation according to claim 12, characterised in that the counting device (30) actuates means for varying the advance of the article in front of the processing point (4) along the processed edge (EF).
17. An installation according to claim 16, characterised in that the variation means comprise a differential claw (34) disposed upstream of the device (3, 33) for driving the article (1 ) being processed.
18. An installation according to claim 16 or 17, characterised in that the counting device (30) is programmed so as to move the variation means along some portions (El, HF) of the processed edge (EF) in order to compensate the expected deformation of the article during processing of the aforementioned portions.
19. A sewing installation according to any of claims 12 to 17, characterised in that the counting device (30) comprises a detector (30) disposed level with the needle bar (4') of the sewing machine (2) and counting the number of stitches
EP86400322A 1985-02-21 1986-02-17 Work piece steering device at a sewing machine Expired EP0194182B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86400322T ATE46725T1 (en) 1985-02-21 1986-02-17 WORKPIECE EDGE GUIDE DEVICE FOR SEWING MACHINE.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR8502519A FR2577578B1 (en) 1985-02-21 1985-02-21 INSTALLATION FOR LINEAR PROCESSING OF AN EDGE OF A FLEXIBLE PART SUCH AS A TEXTILE PART.
FR8502519 1985-02-21
FR8511509 1985-07-26
FR8511509A FR2585378B2 (en) 1985-07-26 1985-07-26 IMPROVED PLANT FOR LINEAR PROCESSING OF AN EDGE OF A FLEXIBLE PART, SUCH AS A TEXTILE PART

Publications (2)

Publication Number Publication Date
EP0194182A1 EP0194182A1 (en) 1986-09-10
EP0194182B1 true EP0194182B1 (en) 1989-09-27

Family

ID=26224386

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86400322A Expired EP0194182B1 (en) 1985-02-21 1986-02-17 Work piece steering device at a sewing machine

Country Status (3)

Country Link
US (1) US4682553A (en)
EP (1) EP0194182B1 (en)
DE (1) DE3665893D1 (en)

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US9481955B2 (en) 2012-08-02 2016-11-01 Johnson Controls Technology Company Stitching system with real-time steering control

Also Published As

Publication number Publication date
US4682553A (en) 1987-07-28
DE3665893D1 (en) 1989-11-02
EP0194182A1 (en) 1986-09-10

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