EP0020184A1 - Sewing machines comprising an automatic fabric-guiding device - Google Patents

Sewing machines comprising an automatic fabric-guiding device Download PDF

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Publication number
EP0020184A1
EP0020184A1 EP80400271A EP80400271A EP0020184A1 EP 0020184 A1 EP0020184 A1 EP 0020184A1 EP 80400271 A EP80400271 A EP 80400271A EP 80400271 A EP80400271 A EP 80400271A EP 0020184 A1 EP0020184 A1 EP 0020184A1
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EP
European Patent Office
Prior art keywords
length
stitch
presser
speed
adjusting
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.)
Granted
Application number
EP80400271A
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German (de)
French (fr)
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EP0020184B1 (en
Inventor
Gérard Biotteau
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Pfaff Industriemaschinen GmbH
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Biotteau Gerard
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Publication date
Application filed by Biotteau Gerard filed Critical Biotteau Gerard
Priority to AT80400271T priority Critical patent/ATE2854T1/en
Publication of EP0020184A1 publication Critical patent/EP0020184A1/en
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Publication of EP0020184B1 publication Critical patent/EP0020184B1/en
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    • DTEXTILES; PAPER
    • D05SEWING; EMBROIDERING; TUFTING
    • D05BSEWING
    • D05B27/00Work-feeding means
    • D05B27/22Work-feeding means with means for setting length of stitch
    • DTEXTILES; PAPER
    • D05SEWING; EMBROIDERING; TUFTING
    • D05BSEWING
    • D05B35/00Work-feeding or -handling elements not otherwise provided for
    • D05B35/10Edge guides
    • D05B35/102Edge guide control systems with edge sensors
    • DTEXTILES; PAPER
    • D05SEWING; EMBROIDERING; TUFTING
    • D05BSEWING
    • D05B69/00Driving-gear; Control devices
    • D05B69/20Control devices responsive to the number of stitches made
    • DTEXTILES; PAPER
    • D05SEWING; EMBROIDERING; TUFTING
    • D05DINDEXING SCHEME ASSOCIATED WITH SUBCLASSES D05B AND D05C, RELATING TO SEWING, EMBROIDERING AND TUFTING
    • D05D2207/00Use of special elements
    • D05D2207/02Pneumatic or hydraulic devices

Definitions

  • the present invention relates to sewing machines comprising an automatic workpiece guiding device.
  • this guide device is to automatically rotate the part in an anti-clockwise direction when the edge of the part to be “joined” or "bordered” has a convex curvature.
  • connect is meant the assembly by a border stitching of two superimposed pieces and by "border” the application of a loop folded astride the edge of the piece.
  • Guidance is, in general, in the device described in this French patent and in its Certificate of Addition as well as in the devices proposed, for example, in American patents? 2,971,483, 3,598,070 and 3,752,097, provided by a presser which comes to bear on the workpiece at the theoretical center of rotation while the workpiece continues to be driven by the claws and the needle or other following drive devices the type of machine.
  • the pressing of the presser is controlled by a detector either mechanical or with photocell, which detects the displacement apparent, towards the presser, from the edge of the workpiece.
  • the object of the present invention is to remedy this defect in a simple manner.
  • the guide device mounted in a known manner on a sewing machine comprising a device for adjusting the stitch length and a device for adjusting the operating speed of the machine, is characterized by a device for increase in the length of the stitch and by a device for reducing the speed of the workpiece drive both controlled by the actuation of the guide presser.
  • the length of the needle pitch and positive drive devices such as the prongs is increased, this lengthening having to correspond substantially to the amplitude of the "backtracking" of the material constituting the part.
  • the combination of these two factors "training on a greater pitch” and “backward retracing” should theoretically lead to a practical length of the point in the curved parts of the bite substantially uniform and equal to that of the point in the straight parts.
  • the "backtrack” varies according to the nature of the material on which the stitching is carried out and also varies according to the nature of the thread used and the length of the stitch.
  • the control device for varying the length of the stitch acting by all or nothing because it is controlled by whether the guide presser is pressed or not it is preferable to provide in the transmission an adjustment of the ratio between the stroke of the control member and the stroke of the controlled stitch length adjusting member or to provide a member such as a stop limiting the stroke of the stitch length adjusting member to be able to take these particular factors into account. This adjustment can be made by trial and error during the general adjustment for a series of parts.
  • the presser control device also controls a reduction in the speed of the drive devices of the part such as the needle and the claws, that is to say in practice of the general drive motor of the machine.
  • control members of the same type as that ensuring the pressing of the presser can therefore be constituted by a pneumatic or hydraulic cylinder in combination with an electromechanical valve or an electromagnet with or without mechanical transmission.
  • Figures 1 to 4 show a stitching 1 made on the corner of a shoe tongue 2 in sheepskin lined with textile.
  • the stitching is carried out using a machine equipped with a guiding device such as that described in the request for French Certificate of Addition N ° 76 11707, the length of the stitch being adjusted to 3 mm.
  • the length of the stitch is regular and the stitching follows a correct line.
  • the stitching is carried out on the same machine as the stitching in FIG. 1, but the latter is provided with a device for modifying the length of the stitch.
  • the length of the stitch is increased from 3 mm to 4.5 mm.
  • a zone c 'in which the point is elongated followed by a zone d' in which the line again becomes irregular and offset towards the outside the point being greatly shortened .
  • FIG. 3 The injection of FIG. 3 is carried out on the same machine as that of FIG. 1, said machine having been provided with a speed adjustment device which makes it possible to reduce the speed of the machine from 3000 points / minute to 900 points / minute when pressing the presser at 3.
  • the line obtained in c "and d" is regular but the length of the point decreases progressively from the entry towards the exit of the zone, the average length falling to a millimeter which does not give a regular puncture.
  • the stitching is carried out on the same machine as that of FIG. 1.
  • the machine is provided with a device allowing both the modification of the length of the stitch and the adjustment of the speed. in accordance with the present invention.
  • the length of the stitch was increased from 3 mm to 4.5 mm and the machine speed which was 3000 points / minute was reduced during the pressing of the presser to 900 points / minute.
  • the curve of the stitching which had a radius of curvature of 6 mm does not present any irregularity and the length of the point remained constant.
  • the reference 10 designates the input of the signal from the detector which controls the descent of the rotary feeler 11
  • 12 designates the input of the signal from the detector which controls the raising of the feeler 11.
  • the reference 13 designates the needle, the reference 14 the crowbar, the reference 15 the feed dogs, the reference 16 the needle plate, the reference 17 the photoelectric cell constituting the rotation control detector, the reference 18, the photoelectric cell starting and stopping of the machine engine, reference 19 the engine, and the ref 20 the electronic engine speed control unit.
  • FIG. 5 represents the overall diagram of the modification according to the invention as regards the adjustment of the length of the stitch.
  • the reference 21 designates the lever of the cursor of the machine which controls the length of the stitch, this lever moving towards the + to increase the length of the stitch and towards the - to shorten it.
  • the normal length of the stitch is adjusted by a micrometric stop 22 and the maximum length by the position of the knurled nut 23 on the lever 21, the lever being biased towards the "long” points by a spring 24 and towards the “short” points "by a jack 25 supplied by a valve 26 controlled by a switch 27 from the input 12 of the presser raising control 11.
  • the device consists essentially of two adjustable potentiometers 28 and 29 inserted in the power supply of the electronic member 20 for controlling the speed of the motor 19.
  • the potentiometer 28 corresponds to slow speed and it is switched on by a relay 30 when the presser 11 is pressed by an entry at 10.
  • the manual contactor 31 enables the device to be switched on or off.
  • a second or more sets of speed adjustment 28 ′, 29 ′, 30 ′, 31 ′ may be provided when the puncture layout includes areas where the speed maximum must be reduced to achieve a pitting curve with a large radius of curvature separating zones with a small radius of curvature, the selection being carried out manually with the contactors 31, 31 '.

Abstract

Sewing machines comprising automatic guide apparatus for the piece, have a presser foot adapted to bear against the piece during operation so as to turn the piece, this bearing of the presser foot being controlled by a detector. A device for regulating the stitch length and a device for regulating the speed of operation of the machine are provided, and the control device for stitch length and the control device for the speed of driving of the piece are actuated by application of the guiding presser foot so as to increase the stitch length and reduce the speed as long as the presser foot is applied, that is, so long as the machine is stitching around a curve.

Description

La présente invention concerne les machines à coudre comportant un dispositif de guidage automatique de la pièce.The present invention relates to sewing machines comprising an automatic workpiece guiding device.

De telles machines sont décrites notamment dans le brevet français N° 74 16917 du 15 mai 1974 et dans son Certificat d'Addition N° 76 11707 du 21 Avril 1976 pour "Dispositif de guidage automatique de la pièce sur une machine à coudre".Such machines are described in particular in French patent N ° 74 16917 of May 15, 1974 and in its Certificate of Addition N ° 76 11707 of April 21, 1976 for "Device for automatic guiding of the workpiece on a sewing machine".

Ce dispositif de guidage a essentiellement pour but d'assurer automatiquement la rotation de la pièce dans le sens inverse des aiguilles d'une montre lorsque le bord de la pièce à "relier" ou à "border" présente une courbure convexe. Par "relier" on entend l'assemblage par une piqûre de bordure de deux pièces superposées et par "border" l'application d'une ganse pliée à cheval sur le bord de la pièce. Le guidage est, d'une manière générale, dans le dispositif décrit dans ce brevet français et dans son Certificat d'Addition ainsi que dans les dispositifs proposés, par exemple, dans les brevets américains ? 2.971.483, 3.598.070 et 3.752.097, assuré par un presseur qui vient prendre appui sur la pièce au centre théorique de rotation alors que la pièce continue à être entraînée par les griffes et l'aiguille ou autres dispositifs d'entraînement suivant le type de la machine. La mise en appui du presseur est commandée par un détecteur soit mécanique, soit à cellule photoélectrique, qui détecte le déplacement apparent, en direction du presseur, du bord de la pièce.The main purpose of this guide device is to automatically rotate the part in an anti-clockwise direction when the edge of the part to be "joined" or "bordered" has a convex curvature. By "connect" is meant the assembly by a border stitching of two superimposed pieces and by "border" the application of a loop folded astride the edge of the piece. Guidance is, in general, in the device described in this French patent and in its Certificate of Addition as well as in the devices proposed, for example, in American patents? 2,971,483, 3,598,070 and 3,752,097, provided by a presser which comes to bear on the workpiece at the theoretical center of rotation while the workpiece continues to be driven by the claws and the needle or other following drive devices the type of machine. The pressing of the presser is controlled by a detector either mechanical or with photocell, which detects the displacement apparent, towards the presser, from the edge of the workpiece.

Le fonctionnement de ce dispositif de guidage est analysé en détail dans le Certificat d'Addition français N° 76 11707 du 21 Avril 1976 publié le 18 Novembre 1977 sous le N° 2.348.993. Ce certificat d'addition décrit en détail le fonctionnement d'un dispositif de guidage qui permet d'effectuer à moins de 5 millimètres du bord de la pièce et par exemple à 3 millimètres du bord de celle-ci, une piqûre dont le tracé présente des courbes convexes de rayon inférieur à une vingtaine de millimètres, ce rayon pouvant descendre jusqu'à environ 7 à 8 millimètres. Il est toutefois signalé dans ce Certificat d'Addition que le dispositif "assure un rayon de courbure constant avec un léger resserrement du point qui est légèrement plus court dans la zone courbe, la contrainte imposée à la matière étant libérée pendant la période de dégagement de l'aiguille et du dispositif d'entraînement". On a indiqué dans ce texte que le resserrement du point dans les courbes convexes constituerait un avantage car la ganse serait mieux appliquée dans une partie où elle aurait tendance à froncer et que l'aspect fini de la pièce serait bien meilleur. En fait, toutefois, cette irrégularité du point se combine avec une certaine irrégularité du tracé et donne un défaut d'aspect qui, s'il est acceptable dans la fabrication en grande série, constitue un inconvénient grave dans le cas des articles de luxe et dans le cas des piqûres effectuées avec un fil assez gros ou d'une couleur tranchée par rapport à la pièce.The operation of this guidance device is analyzed in detail in the French Addition Certificate N ° 76 11707 of April 21, 1976 published on November 18, 1977 under N ° 2.348.993. This addition certificate describes in detail the operation of a guiding device which makes it possible to make, within 5 millimeters from the edge of the part and for example 3 millimeters from the edge of the latter, a puncture whose outline has convex curves of radius less than about twenty millimeters, this radius being able to go down to approximately 7 to 8 millimeters. It is however indicated in this Certificate of Addition that the device "ensures a constant radius of curvature with a slight tightening of the point which is slightly shorter in the curved area, the stress imposed on the material being released during the release period of needle and drive ". It was indicated in this text that the tightening of the point in the convex curves would be an advantage because the strap would be better applied in a part where it would tend to gather and that the finished appearance of the part would be much better. In fact, however, this point irregularity is combined with a certain irregularity in the layout and gives an appearance defect which, if acceptable in mass production, constitutes a serious disadvantage in the case of luxury articles and in the case of bites made with a fairly large wire or a color marked in relation to the part.

Ce défaut résultait du principe même de fonctionnement du dispositif de guidage, le presseur freinant la pièce en une matière plus ou moins déformable alors que celle-ci est entraînée périodiquement par des moyens d'entraînement qui, à chaque point, reviennent en arrière pour saisir à nouveau la pièce et la faire avancer de la longueur théorique du point afin d'effectuer un nouveau point. Le "ressort" de la matière de la pièce l'amène à suivre partiellement les moyens d'entraînement pendant la période où le bord de la pièce est libre, la pièce étant maintenue serrée par le presseur à une certaine distance de la ligne d'entraînement positif qui est la ligne d'action des organes d'entraînement. Il semblait donc impossible d'y remédier et le défaut était considéré comme une contre partie de la très grande vitesse de piqûre qui est réalisable sur une machine munie de ce dispositif de guidage.This defect resulted from the very principle of operation of the guide device, the presser braking the workpiece in a more or less deformable material while the latter is periodically driven by drive means which, at each point, go back to grasp again the part and advance it by the theoretical length of the point in order to make a new point. The "spring" of the workpiece material causes it to partially follow the drive means during the period when the edge of the workpiece is free, the part being kept clamped by the presser at a certain distance from the positive drive line which is the line of action of the drive members. It therefore seemed impossible to remedy it and the defect was considered as a counterpart of the very high puncture speed which is achievable on a machine provided with this guiding device.

La présente invention a pour but de remédier d'une manière simple à ce défaut.The object of the present invention is to remedy this defect in a simple manner.

Conformément à l'invention le dispositif de guidage, monté de façon connue sur une machine à coudre comportant un dispositif de réglage de la longueur du point et un dispositif de réglage de la vitesse de fonctionnement de la machine, est caractérisé par un dispositif d'accroissement de la longueur du point et par un dispositif de réduction de la vitesse de l'entraînement de la pièce asservis tous les deux à la mise en action du presseur de guidage.According to the invention, the guide device, mounted in a known manner on a sewing machine comprising a device for adjusting the stitch length and a device for adjusting the operating speed of the machine, is characterized by a device for increase in the length of the stitch and by a device for reducing the speed of the workpiece drive both controlled by the actuation of the guide presser.

En agissant sur le dispositif de réglage de la longueur du point, on accroit la longueur du pas de l'aiguille et des dispositifs d'entraînement positif tels que les griffes, cet allongement devant correspondre sensiblement à l'amplitude du "retour arrière" de la matière constituant la pièce. La combinaison de ces deux facteurs "entraînement sur un plus grand pas" et "retour arrière" devrait aboutir théoriquement à une longueur pratique du point dans les parties en courbe de la piqûre sensiblement uniforme et égale à celle du point dans les parties rectilignes.By acting on the stitch length adjustment device, the length of the needle pitch and positive drive devices such as the prongs is increased, this lengthening having to correspond substantially to the amplitude of the "backtracking" of the material constituting the part. The combination of these two factors "training on a greater pitch" and "backward retracing" should theoretically lead to a practical length of the point in the curved parts of the bite substantially uniform and equal to that of the point in the straight parts.

Le "retour arrière"varie selon la nature du matériau sur lequel est effectuée la piqûre et varie également selon la nature du fil mis en oeuvre et la longueur du point. Le dispositif de commande de variation de la longueur du point agissant par tout ou rien du fait qu'il est asservi à la mise en appui ou non du presseur de guidage, il est préférable de prévoir dans la transmission un réglage du rapport entre la course de l'organe de commande et la course de l'organe commandé de réglage de la longueur du point ou de prévoir un organe tel qu'une butée de limitation de la course de l'organe de réglage de la longueur du point pour pouvoir tenir compte de ces facteurs particuliers. Ce réglage peut être effectué par tatonnement au cours du réglage général pour une série de pièces.The "backtrack" varies according to the nature of the material on which the stitching is carried out and also varies according to the nature of the thread used and the length of the stitch. The control device for varying the length of the stitch acting by all or nothing because it is controlled by whether the guide presser is pressed or not, it is preferable to provide in the transmission an adjustment of the ratio between the stroke of the control member and the stroke of the controlled stitch length adjusting member or to provide a member such as a stop limiting the stroke of the stitch length adjusting member to be able to take these particular factors into account. This adjustment can be made by trial and error during the general adjustment for a series of parts.

En outre une vitesse de fonctionnement très élevée de l'ordre de 3000 points/minute, telle que celle qu'il est possible d'utiliser pour les piqûres rectilignes, est trop élevée pendant la période où la pièce doit effectuer une rotation autour du presseur. On a constaté en effet que l'inertie propre de la pièce l'empêchait de tourner d'une manière uniforme et que le rayon de courbure de la piqûre tendait à "s'ouvrir",la partie de la piqûre se trouvant à la sortie du virage étant déportée vers l'extérieur. En conséquence et selon la deuxième caractéristique de l'invention dont la combinaison avec l'allongement de la longueur du point est nécessaire pour obtenir le résultat, le dispositif de commande du presseur commande également une réduction de la vitesse des dispositifs d'entraînement de la pièce tels que l'aiguille et les griffes, c'est-à-dire en pratique du moteur d'entraînement général de la machine.In addition, a very high operating speed of the order of 3000 points / minute, such as that which can be used for rectilinear punctures, is too high during the period when the part must rotate around the presser. . In fact, it has been found that the inertia inherent in the part prevents it from rotating in a uniform manner and that the radius of curvature of the puncture tends to "open", the part of the puncture being at the outlet. of the turn being offset to the outside. Consequently and according to the second characteristic of the invention, the combination of which with the lengthening of the stitch length is necessary to obtain the result, the presser control device also controls a reduction in the speed of the drive devices of the part such as the needle and the claws, that is to say in practice of the general drive motor of the machine.

Les asservissements du dispositif de réglage de la longueur du point et du dispositif de réglage de la vitesse de la machine sont de préférence assurés par des organes de commande du même type que celui assurant la mise en appui du presseur. Ces organes de commande peuvent, en conséquence, être constitués par un vérin pneumatique ou hydraulique en combinaison avec une vanne électromécanique ou un électro-aimant avec ou sans transmission mécanique.The controls of the stitch length adjusting device and the machine speed adjusting device are preferably ensured by control members of the same type as that ensuring the pressing of the presser. These control members can therefore be constituted by a pneumatic or hydraulic cylinder in combination with an electromechanical valve or an electromagnet with or without mechanical transmission.

L'invention sera décrite plus en détail ci-après avec référence aux dessins ci-annexés dans lesquels :

  • La figure 1 est une reproduction à plus grande échelle d'une piqûre réalisée avec le dispositif de guidage selon le Certificat d'Addition français N° 76 11707 avec une "longueur de point constante" et une "vitesse constante"; la figure 2 est une vue semblable à figure 1 avec allongement de la longueur du point sans réduction de la vitesse; la figure 3 est une vue semblable à figure 1 avec réduction de la vitesse sans modification de la longueur du point; la figure 4 est une reproduction à la même échelle d'une piqûre réalisée avec la machine modifiée conformément à l'invention; la figure 5 est un schéma du dispositif de guidage conforme à l'invention en ce qui concerne la longueur du point et la figure 6 est un schéma du dispositif de réglage de la vitesse.
The invention will be described in more detail below with reference to the accompanying drawings in which:
  • Figure 1 is an enlarged reproduction of a puncture made with the guide device according to the French Addition Certificate No. 76 11707 with a "constant stitch length" and a "constant speed"; Figure 2 is a view similar to Figure 1 with elongation of the stitch length without reduction of the speed; FIG. 3 is a view similar to FIG. 1 with reduction of the speed without modification of the length of the stitch; Figure 4 is a reproduction on the same scale of a puncture made with the machine modified according to the invention; Figure 5 is a diagram of the guide device according to the invention with regard to the length of the stitch and Figure 6 is a diagram of the speed adjustment device.

Les figures 1 à 4 représentent une piqûre 1 réalisée sur le coin d'une languette de chaussure 2 en basane doublée textile. Dans la figure 1, la piqûre est réalisée à l'aide d'une machine équipée d'un dispositif de guidage tel que celui décrit dans la demande de Certificat d'Addition française N° 76 11707, la longueur du point étant réglée à 3 mm. Comme on peut le voir sur la figure dans la zone d'entrée a et dans la zone de sortie b , la longueur du point est régulière et la piqûre suit une ligne correcte. Par contre sur la longueur de la piqûre pendant la réalisation de laquelle le presseur est en appui au point 3, on trouve une pa.rtie c dans laquelle le tracé de la piqûre reste à peu près correct mais avec un point raccourci présentant une longueur de point d'environ 1 mm suivie d'ure partie d dans laquelle le tracé est irrégulier avec des points de plus en plus courts.Figures 1 to 4 show a stitching 1 made on the corner of a shoe tongue 2 in sheepskin lined with textile. In FIG. 1, the stitching is carried out using a machine equipped with a guiding device such as that described in the request for French Certificate of Addition N ° 76 11707, the length of the stitch being adjusted to 3 mm. As can be seen in the figure in the entry area a and in the exit area b, the length of the stitch is regular and the stitching follows a correct line. On the other hand, over the length of the puncture during the production of which the presser is in support at point 3, there is a part c in which the path of the puncture remains approximately correct but with a shortened point having a length of point of about 1 mm followed by a part d in which the line is irregular with increasingly short points.

Dans la figure 2, la piqûre est réalisée sur la même machine que la piqûre de figure 1, mais celle-ci est munie d'un dispositif de modification de la longueur du point. Ainsi, lors de la mise en appui en 3 du presseur, la longueur du point est portée de 3 mm à 4,5 mm. Dans ce cas, on trouve après la zone d'entrée a et au moment de la mise en appui du presseur, une zone c' dans laquelle le point est allongé suivie d'une zone d' dans laquelle le tracé redevient irrégulier et déporté vers l'extérieur le point étant fortement raccourci.In FIG. 2, the stitching is carried out on the same machine as the stitching in FIG. 1, but the latter is provided with a device for modifying the length of the stitch. Thus, during the pressing of the presser at 3, the length of the stitch is increased from 3 mm to 4.5 mm. In this case, we find after the entry zone a and at the moment of pressing the presser, a zone c 'in which the point is elongated followed by a zone d' in which the line again becomes irregular and offset towards the outside the point being greatly shortened .

La piqûre de la figure 3 est réalisée sur la même machine que celle de la figure 1, ladite machine ayant été munie d'un dispositif de réglage de la vitesse qui permet de diminuer la vitesse de la machine de 3000 points/minute à 900 points/ minute lors de la mise en appui en 3 du presseur. Dans ce cas, le tracé obtenu en c" et d" est régulier mais la longueur du point diminue progressivement de l'entrée vers la sortie de la zone, la longueur moyenne tombant à un millimètre ce qui ne donne pas une piqûre régulière.The injection of FIG. 3 is carried out on the same machine as that of FIG. 1, said machine having been provided with a speed adjustment device which makes it possible to reduce the speed of the machine from 3000 points / minute to 900 points / minute when pressing the presser at 3. In this case, the line obtained in c "and d" is regular but the length of the point decreases progressively from the entry towards the exit of the zone, the average length falling to a millimeter which does not give a regular puncture.

Dans la figure 4, la piqûre est réalisée sur la même machine que celle de figure 1. Toutefois, dans ce cas, la machine est munie d'un dispositif permettant à la fois la modification de la longueur du point et le réglage de la vitesse conformément à la présente invention. Lors de la mise en appui en 3 du presseur la longueur du point a été portée de 3 mm à 4,5 mm et la vitesse de la machine qui était de 3000 points/minute a été ramenée pendant la mise en appui du presseur à 900 points/minute. Comme on le voit la courbe de la piqûre qui avait un rayon de courbure de 6 mm ne présente aucune irrégularité et la longueur du point est restée constante.In FIG. 4, the stitching is carried out on the same machine as that of FIG. 1. However, in this case, the machine is provided with a device allowing both the modification of the length of the stitch and the adjustment of the speed. in accordance with the present invention. During the pressing of the presser in 3 the length of the stitch was increased from 3 mm to 4.5 mm and the machine speed which was 3000 points / minute was reduced during the pressing of the presser to 900 points / minute. As we can see the curve of the stitching which had a radius of curvature of 6 mm does not present any irregularity and the length of the point remained constant.

Dans les figures 5 et 6, la référence 10 désigne l'entrée du signal du détecteur qui commande la descente du palpeur de rotation 11, et 12 désigne l'entrée du signal du détecteur qui commande le relèvement du palpeur 11. La référence 13 désigne l'aiguille, la référence 14 le pied de biche, la référence 15 les griffes d'entraînement, la référence 16 la plaque à aiguille, la référence 17 la cellule photoélectrique constituant le détecteur de commande de rotation, la référence 18, la cellule photoélectrique de départ et d'arrêt du moteur de la machine, la référence 19 le moteur, et la référence 20 l'organe électronique de commande de la vitesse du moteur.In FIGS. 5 and 6, the reference 10 designates the input of the signal from the detector which controls the descent of the rotary feeler 11, and 12 designates the input of the signal from the detector which controls the raising of the feeler 11. The reference 13 designates the needle, the reference 14 the crowbar, the reference 15 the feed dogs, the reference 16 the needle plate, the reference 17 the photoelectric cell constituting the rotation control detector, the reference 18, the photoelectric cell starting and stopping of the machine engine, reference 19 the engine, and the ref 20 the electronic engine speed control unit.

La figure 5 représente le schéma d'ensemble de la modification conforme à l'invention en ce qui concerne le réglage de la longueur du point. Dans cette figure la référence 21 désigne le levier du curseur de la machine qui contrôle la longueur du point, ce levier se déplaçant vers le + pour accroître la longueur du point et vers le - pour le raccourcir. La longueur normale du point est réglée par une butée micrométrique 22 et la longueur maximale par la position de l'écrou moleté 23 sur le levier 21, le levier étant sollicité vers les points "longs" par un ressort 24 et vers les points "courts" par un vérin 25 alimenté par une vanne 26 commandée par l'intermédiaire d'un interrupteur 27 depuis l'entrée 12 de la commande de relèvement du presseur 11. En conséquence, lorsqu'à l'amorce d'un virage sur le contour du morceau à piquer, la cellule photoélectrique 17 est découverte, le signal de contrôle sur l'entrée 12 cesse et un signal de commande de mise en appui du presseur 11 apparaît sur l'entrée 10. De ce fait le vérin 25 n'est plus alimenté et, sous l'action du ressort 24, le levier 21 vient dans la position du point long, par exemple 4,5 mm pour une longueur normale de point de 3 mm.FIG. 5 represents the overall diagram of the modification according to the invention as regards the adjustment of the length of the stitch. In this figure, the reference 21 designates the lever of the cursor of the machine which controls the length of the stitch, this lever moving towards the + to increase the length of the stitch and towards the - to shorten it. The normal length of the stitch is adjusted by a micrometric stop 22 and the maximum length by the position of the knurled nut 23 on the lever 21, the lever being biased towards the "long" points by a spring 24 and towards the "short" points "by a jack 25 supplied by a valve 26 controlled by a switch 27 from the input 12 of the presser raising control 11. Consequently, when at the start of a turn on the contour of the piece to be stitched, the photoelectric cell 17 is uncovered, the control signal on the input 12 ceases and a press control command signal of the presser 11 appears on the input 10. As a result the jack 25 is not more energized and, under the action of the spring 24, the lever 21 comes into the long point position, for example 4.5 mm for a normal point length of 3 mm.

Simultanément le dispositif de contrôle de la vitesse représenté dans la figure 6 rentre en action. Le dispositif est constitué essentiellement par deux potentiomètres réglables 28 et 29 insérés dans l'alimentation de l'organe électronique 20 de contrôle de la vitesse du moteur 19.-Le potentiomètre 28 correspond à la vitesse lente et il est mis en circuit par un relais 30 lorsque le presseur 11 est mis en appui par une entrée en 10. Lorsqu'aucune entrée n'existe sur 10 c'est le potentiomètre 29 de vitesse rapide qui est en circuit. Le contacteur manuel 31 permet la mise en circuit ou hors circuit du dispositif. Un deuxième ou plusieurs ensembles de réglage de la vitesse 28' , 29' , 30' , 31' peuvent être prévus lorsque le tracé de la piqûre comporte des zones où la vitesse maximale doit être réduite pour réaliser une piqûre en courbe avec grand rayon de courbure séparant des zones à faible rayon de courbure, la sélection étant effectuée manuellement avec les contacteurs 31, 31'.Simultaneously the speed control device shown in Figure 6 comes into action. The device consists essentially of two adjustable potentiometers 28 and 29 inserted in the power supply of the electronic member 20 for controlling the speed of the motor 19.-The potentiometer 28 corresponds to slow speed and it is switched on by a relay 30 when the presser 11 is pressed by an entry at 10. When no entry exists on 10 it is the potentiometer 29 of fast speed which is in circuit. The manual contactor 31 enables the device to be switched on or off. A second or more sets of speed adjustment 28 ′, 29 ′, 30 ′, 31 ′ may be provided when the puncture layout includes areas where the speed maximum must be reduced to achieve a pitting curve with a large radius of curvature separating zones with a small radius of curvature, the selection being carried out manually with the contactors 31, 31 '.

Les modes de réalisation ci-dessus décrits sont susceptibles de recevoir de nombreuses modifications sans sortir du cadre de l'invention, les commandes pouvant notamment être inversées pour être contrôlées par les entrées sur l'une quelconque des entrées 10 et 12The embodiments described above are capable of receiving numerous modifications without departing from the scope of the invention, the commands being able in particular to be reversed to be controlled by the inputs on any of the inputs 10 and 12

Claims (5)

1. Une machine à coudre comportant un dispositif de guidage automatique de la pièce constitué essentiellement par un presseur susceptible de venir prendre appui sur la pièce en cours de travail de façon à faire tourner la pièce, cette mise en appui du presseur étant commandée par un détecteur, ladite machine à coudre comportant aussi un dispositif de réglage de la longueur du point et un dispositif de réglage de la vitesse de fonctionnement de la machine caractérisée en ce qu'elle comporte des moyens asservissant le dispositif de réglage de la longueur du point et le dispositif de réglage de la vitesse de l'entraînement de la pièce à la mise en action du presseur de guidage de façon à accroître la longueur du point et réduire la vitesse pendant la durée de la mise en appui du presseur.1. A sewing machine comprising an automatic device for guiding the part, consisting essentially of a presser capable of coming to bear on the part during work so as to rotate the part, this pressing of the presser being controlled by a detector, said sewing machine also comprising a device for adjusting the length of the stitch and a device for adjusting the operating speed of the machine, characterized in that it comprises means controlling the device for adjusting the length of the stitch and the device for adjusting the speed of the workpiece drive when the guide presser is actuated so as to increase the length of the stitch and reduce the speed for the duration of the presser pressing. 2. Une machine à coudre avec dispositif de guidage selon la revendication 1,
caractérisée en ce que l'asservissement est assuré pour chaque dispositif de réglage par un organe de commande du même type que celui assurant la mise en appui du presseur.
2. A sewing machine with guide device according to claim 1,
characterized in that the control is ensured for each adjustment device by a control member of the same type as that ensuring the pressing of the presser.
3. Une machine à coudre avec dispositif de guidage selon la revendication 2,
caractérisée en ce que l'organe de commande est constitué par un vérin pneumatique ou hydraulique en combinaison avec une vanne électromécanique ou un électro-aimant avec ou sans transmission mécanique.
3. A sewing machine with guide device according to claim 2,
characterized in that the control member is constituted by a pneumatic or hydraulic cylinder in combination with an electromechanical valve or an electromagnet with or without mechanical transmission.
4. Une machine à coudre avec dispositif de guidage selon l'une quelconque des revendications 1 à 3,
caractérisée en ce qu'elle comporte un dispositif de réglage du rapport entre la course de l'organe de commande et la course de l'organe commandé de réglage de la longueur du point.
4. A sewing machine with guide device according to any one of claims 1 to 3,
characterized in that it comprises a device for adjusting the ratio between the stroke of the control member and the stroke of the controlled member for adjusting the length of the stitch.
5. Une machine à coudre avec dispositif de guidage selon l'une quelconque des revendications 1 à 3,
caractérisée en ce qu'elle comporte un organe, tel qu'une butée, de limitation de la course de l'organe de réglage de la longueur du point.
5. A sewing machine with guide device according to any one of claims 1 to 3,
characterized in that it comprises a member, such as a stop, for limiting the stroke of the member for adjusting the length of the stitch.
EP80400271A 1979-05-11 1980-02-27 Sewing machines comprising an automatic fabric-guiding device Expired EP0020184B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80400271T ATE2854T1 (en) 1979-05-11 1980-02-27 SEWING MACHINES WITH AUTOMATIC PIECE FEED.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7912011A FR2456156B1 (en) 1979-05-11 1979-05-11 IMPROVEMENT IN SEWING MACHINES INCLUDING AN AUTOMATIC WORK GUIDANCE DEVICE
FR7912011 1979-05-11

Publications (2)

Publication Number Publication Date
EP0020184A1 true EP0020184A1 (en) 1980-12-10
EP0020184B1 EP0020184B1 (en) 1983-03-23

Family

ID=9225356

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80400271A Expired EP0020184B1 (en) 1979-05-11 1980-02-27 Sewing machines comprising an automatic fabric-guiding device

Country Status (8)

Country Link
US (1) US4312286A (en)
EP (1) EP0020184B1 (en)
AT (1) ATE2854T1 (en)
BR (1) BR8002825A (en)
DE (1) DE3062392D1 (en)
ES (1) ES489941A1 (en)
FR (1) FR2456156B1 (en)
PT (1) PT71034A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0194182A1 (en) * 1985-02-21 1986-09-10 Centre Technique Industriel dit: INSTITUT TEXTILE DE FRANCE Work piece steering device at a sewing machine
FR2585378A2 (en) * 1985-07-26 1987-01-30 Inst Textile De France Improved installation for the linear treatment of an edge of a flexible article, such as a textile article
EP0237510A2 (en) * 1986-03-11 1987-09-16 Husqvarna Aktiebolag Control arrangement of feeding in a sewing machine

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3314717C1 (en) * 1983-04-22 1984-02-09 Pfaff Industriemaschinen Gmbh, 6750 Kaiserslautern Sewing machine with at least one fabric pusher and a guiding device for the automatic production of a curved seam parallel to the edge
GB8316899D0 (en) * 1983-06-22 1983-07-27 British United Shoe Machinery Folding machines
US4589363A (en) * 1984-10-06 1986-05-20 Pfaff Industriemaschinen Gmbh Sewing machine for automatically making edge-parallel seams

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US3609373A (en) * 1970-05-18 1971-09-28 Singer Co Photoelectric sensors and circuitry for edge-guiding systems for sewing machines
US3742879A (en) * 1970-12-03 1973-07-03 Usm Corp Automatic work guidance mechanism
FR2230778A1 (en) * 1973-05-22 1974-12-20 Rimoldi C Spa Virginio
DE2608859A1 (en) * 1976-03-04 1977-09-08 Duerkoppwerke Superposed sewing blanks adjusting device - has carriage provided with blank tensioning cables associated with limit switches compensating tension difference

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BE538934A (en) * 1954-06-15
US3139051A (en) * 1962-08-21 1964-06-30 Wayne G Story Sewing machine universal feed arrangement
FR2348993A2 (en) * 1976-04-21 1977-11-18 Eram Chaussures AUTOMATIC PART GUIDANCE DEVICE ON A SEWING MACHINE
US4100864A (en) * 1977-01-17 1978-07-18 Usm Corporation Automatic work guidance mechanism

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3609373A (en) * 1970-05-18 1971-09-28 Singer Co Photoelectric sensors and circuitry for edge-guiding systems for sewing machines
US3742879A (en) * 1970-12-03 1973-07-03 Usm Corp Automatic work guidance mechanism
FR2230778A1 (en) * 1973-05-22 1974-12-20 Rimoldi C Spa Virginio
DE2608859A1 (en) * 1976-03-04 1977-09-08 Duerkoppwerke Superposed sewing blanks adjusting device - has carriage provided with blank tensioning cables associated with limit switches compensating tension difference

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0194182A1 (en) * 1985-02-21 1986-09-10 Centre Technique Industriel dit: INSTITUT TEXTILE DE FRANCE Work piece steering device at a sewing machine
FR2585378A2 (en) * 1985-07-26 1987-01-30 Inst Textile De France Improved installation for the linear treatment of an edge of a flexible article, such as a textile article
EP0237510A2 (en) * 1986-03-11 1987-09-16 Husqvarna Aktiebolag Control arrangement of feeding in a sewing machine
EP0237510A3 (en) * 1986-03-11 1988-04-06 Husqvarna Aktiebolag Control arrangement of feeding in a sewing machine

Also Published As

Publication number Publication date
FR2456156A1 (en) 1980-12-05
DE3062392D1 (en) 1983-04-28
PT71034A (en) 1980-04-01
BR8002825A (en) 1980-12-16
US4312286A (en) 1982-01-26
ATE2854T1 (en) 1983-04-15
EP0020184B1 (en) 1983-03-23
FR2456156B1 (en) 1985-05-31
ES489941A1 (en) 1980-10-01

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