EP0216644B1 - Steuereinrichtung für weiche, nichtflächige Werkstücke an Nähmaschinen - Google Patents

Steuereinrichtung für weiche, nichtflächige Werkstücke an Nähmaschinen Download PDF

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Publication number
EP0216644B1
EP0216644B1 EP86401500A EP86401500A EP0216644B1 EP 0216644 B1 EP0216644 B1 EP 0216644B1 EP 86401500 A EP86401500 A EP 86401500A EP 86401500 A EP86401500 A EP 86401500A EP 0216644 B1 EP0216644 B1 EP 0216644B1
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EP
European Patent Office
Prior art keywords
edge
signal
wheel
circuit
fabric
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
EP86401500A
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English (en)
French (fr)
Other versions
EP0216644A1 (de
Inventor
Christian Huau
Pierre Jean Alphonse Facon
Alain Pelleray
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.)
ALAIN ROULEAU EN PATRICK ROULEAU BEIDEN TE TOULOUS
Original Assignee
Bertin et Cie SA
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 FR8511858A external-priority patent/FR2585683B1/fr
Priority claimed from FR8511859A external-priority patent/FR2585684B1/fr
Application filed by Bertin et Cie SA filed Critical Bertin et Cie SA
Priority to AT86401500T priority Critical patent/ATE46726T1/de
Publication of EP0216644A1 publication Critical patent/EP0216644A1/de
Application granted granted Critical
Publication of EP0216644B1 publication Critical patent/EP0216644B1/de
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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H43/00—Use of control, checking, or safety devices, e.g. automatic devices comprising an element for sensing a variable
    • B65H43/08—Photoelectric devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H7/00—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles
    • B65H7/02—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors
    • B65H7/14—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors by photoelectric feelers or detectors
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B35/00—Work-feeding or -handling elements not otherwise provided for
    • D05B35/10—Edge guides
    • D05B35/107—Fixed or adjustable pin holding the work, e.g. for circular or spiral stitching
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B73/00—Casings
    • D05B73/04—Lower casings
    • D05B73/12—Slides; Needle plates
    • 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
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05D—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES D05B AND D05C, RELATING TO SEWING, EMBROIDERING AND TUFTING
    • D05D2209/00—Use of special materials
    • D05D2209/04—Use of special materials with high friction
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05D—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES D05B AND D05C, RELATING TO SEWING, EMBROIDERING AND TUFTING
    • D05D2209/00—Use of special materials
    • D05D2209/08—Use of special materials elastic, e.g. rubber spring
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05D—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES D05B AND D05C, RELATING TO SEWING, EMBROIDERING AND TUFTING
    • D05D2303/00—Applied objects or articles
    • D05D2303/02—Tape
    • D05D2303/04—Tape elastic

Definitions

  • the invention relates to an assembly for guiding sheets of flexible material intended to form a three-dimensional assembly, said assembly comprising a drive device formed of at least one support plate, a drive wheel pressing a sheet to be guided on the support plate, drive wheel control means, and a sheet edge position detector for controlling the drive device, said detector comprising at least one photoelectric detector disposed in front of the edge, serving guiding the piece of fabric and the electronic circuits, transforming the signal delivered by the photoelectric detector into a control signal from the drive device.
  • the assembly of flexible parts in a three-dimensional shape is mainly encountered in the clothing industries. Indeed, the making of clothing consists in assembling pieces of more or less deformable fabric to form a surface intended to cover a volume. The assembly is carried out for fabrics, whatever their texture, by sewing. Two cases can arise depending on whether or not the pieces can be superimposed before sewing.
  • Conventional sewing machines generally include a mechanism providing the inter-looping of the sewing thread (s) and a mechanism for advancing the fabric.
  • This advance mechanism consists of an elliptical movement claw and a presser foot between which the fabric passes.
  • the longitudinal amplitude of the claw movement determines the length of the stitch and is generally adjustable.
  • the parts to be assembled are guided relative to their edges which the operator superimposes as exactly as possible.
  • Actuators can take many forms, however it seems that only claw and wheel actuators have had some developments, with a preference for the latter, the implementation of which is easier.
  • the wheel actuators of the known technique can be divided into two groups: those with free wheel and fixed direction, and those with controlled wheel and fixed direction.
  • French Patent No. 2,241,648 describes an actuator of the first group whose free wheel makes an angle with the direction of advance of the piece of fabric so as to impart thereto a rotational movement, limited by the abutment of the edge of the fabric along a guide whose curvature corresponds to the orientation necessary for the formation of a three-dimensional assembly seam, the second piece of fabric, possibly being guided by the same device.
  • This process has a certain number of drawbacks among which it is necessary to point out a use limited to fabrics sufficiently rigid so that their edge can be effectively guided by the guide, and the need to have as many guides as models of making and sizes.
  • the guide device also comprises means for adjusting the pressure of the wheel on the fabric so as to ensure a contact pressure which is a function, inter alia, of the material, the thickness and the weaving.
  • the position detector comprises at least one photoelectric detector disposed in front of one of the faces of a plate intended to separate, to allow their positioning, two pieces of fabric to be assembled by sewing.
  • the photoelectric detector is made up of two pairs of light-emitting diodes and photo-transistors.
  • the reference position from which the position of the edge of the fabric is checked, is that for which the edge is centered between the two diodes.
  • a second similar photoelectric detector is mounted on the other side of the separation plate to detect the edge of the second piece of fabric.
  • the electrical signals supplied by the photoelectric detectors are sent into an electronic processor device which compares the signals received for each piece of fabric with reference values stored in memory and acts on the drive circuits of the motors of a device for guiding pieces of fabric.
  • the analog device no more than the logic system (all or nothing) does not allow the treatment of fabrics of irregular transparency such as lace, tulle, or printed fabrics with strong variations in density.
  • the openwork fabrics have, after cutting, very jagged edges and, in the limit, in the case of tulle, threads separated by spaces greater than their diameter.
  • the presence of gaps inside the fabric in the field of the photoelectric detector prevents the use of simple analog sensors measuring the level of obscured surface.
  • the scrolling of the edge of an openwork fabric in front of a supposed sensor capable of detecting the precise position of the apparent edge and not of the cut will give an analog signal reproducing the fluctuations of this apparent edge. These fluctuations are due to the displacement of the cutting line in front of the sensor and to the presence of gaps in the fabric along this line. We must therefore be able to distinguish these two causes in order to reconstruct the cutting line that the seam must follow.
  • the subject of the invention is a guide assembly the drive device of which comprises a drive wheel which can be oriented as a function of the desired curvature, the speed of rotation of which is mechanically controlled by its orientation and the edge position detector of which allows, from the detection of the apparent edge of the fabric, to reconstruct the cutting line parallel to which the seam is to be executed.
  • the drive device is mounted on a larger scale, FIG. 2, mounted on a machine head containing the mechanism for actuating the needle rod 2 at the end of which the needle 3 is fixed and the lowering mechanism and presser foot developer 4.
  • the head further includes the mechanism for feeding and guiding the needle thread (not shown).
  • the table 5 (FIG. 3) carries the needle plate 6 in which are provided openings for the passage of the feed means constituted by the claw 7 and a needle passage hole 8.
  • the claw is animated with an alternating movement which causes the teeth to periodically protrude from the plate simultaneously with their movement from the front to the rear of the machine (for an observer looking at the machine according to FIG. 1), the return of the claw s performing, the teeth being below the plate.
  • the table also carries the stitch formation mechanism by interlocking the needle thread with the bobbin thread.
  • the pieces of the fabric to be assembled by sewing are introduced once positioned on the needle plate where they are held by the pressure of the lifting presser foot.
  • the synchronization of the various movements of the mechanical parts of the machine is designed so that when the needle passes through the pieces of the fabric to loop the sewing threads, these are kept stationary.
  • the claw protrudes from the needle plate and presses the fabric against the presser foot and drives it backwards bringing between the foot presser and needle plate a length of fabric corresponding to the length of the stitch.
  • the drive device is positioned in front of the needle plate, and comprises a spherical wheel 9 which presses on one of the pieces of fabric to be guided.
  • the wheel is freely movable around an axis 10, parallel to the surface of the fabric, fixed by one of its ends to a wing 11 of a bracket 12 whose other wing 13 is fixed to a shaft 14, mobile around its axis in bearings 15, 16 fixed to a fixed frame 17.
  • the shaft 14 and the axis 10 of the wheel are, according to the embodiment perpendicular and the axis of the shaft 14 passes through the center of the spherical wheel.
  • the shaft 14 is provided with an angular position measurement device 18 consisting, for example, of a circular potentiometer and carries at its free end rotation control means consisting of a servo motor 19 controlled by a device edge detection electronics which will be described later.
  • the stators of the potentiometer and servo-motor are fixed by a spacer 20 to the fixed frame 17.
  • the wheel 9 is rotated about its axis 10 by a roller 21 whose axis 22 is in a plane containing the axis 10 of the wheel, preferably in the horizontal plane orthogonal to the shaft 14.
  • the roller occupies a fixed position relative to the frame 17 on which it is held by a bearing.
  • the roller is rotated by a mechanical transmission consisting at least in part of a set of pulleys 23, 24 and belt 25.
  • This set is itself driven by a transmission 26 connected directly or indirectly to a power take-off 27 on the main shaft of the machine.
  • the speed of rotation thus communicated to the roller is linked to that of the machine and therefore is a function of the speed of advance of the parts under the seam forming mechanism.
  • the roller 21 drives the spherical wheel 9 in circles, the diameter of which depends on the orientation thereof. As the piece of cloth is always driven at the same point situated on a large circle of the wheel, the speed at this point will vary inversely proportional to the diameter of the circle along which the roller will drive the wheel.
  • FIG. 4 makes it possible to understand the principle of the variation of the drive speed as a function of the position of the wheel in front of the roller whose speed is considered to be constant.
  • the first position 1 (solid line) shows the spherical wheel 9 oriented so that its plane of symmetry coincides with the plane of symmetry of the roller 21.
  • a second position II in broken lines the vertical plane of symmetry of the wheel is turned, for example to the right, by an angle a.
  • the axis of the wheel, perpendicular to the plane of symmetry, also rotates by the same angle, presenting before the roller 21 a circle of radius R 1 less than R and equal to R cos a.
  • V o can be considered as a component of the speed V, and was chosen, for reasons which will be developed later, equal to the speed of advance of the claw and in the same direction.
  • the synchronous mechanical drive of the movement of the main shaft of the machine is replaced by a servomotor 230 (shown in broken lines) making it possible to communicate to the wheel, via the roller, a tangential speed producing a drive of the part to be guided at a speed of which a component parallel to the direction of movement of the claw is constant and equal to the speed of advance of the parts to be assembled.
  • the guide assembly comprises a separation device 28 consisting of a support plate 29 comprised between two support plates 30, 31 disposed respectively above and below the plate 29 and at a distance from the support plate, corresponding approximately to the thickness of the pieces of fabric 32, 33 to be assembled.
  • the support plates carry an opening 34 ensuring the passage of the wheel of the device for driving the piece of fabric, the wheel being in abutment against said piece of fabric.
  • the drive device to a guide assembly of a sewing machine, provision is made for guiding each of the pieces of fabric to be assembled.
  • the piece of fabric 33 passing between the support plate 31 and the support plate 29 is guided by a device at all points similar to the first, which is suggested in FIG. 2 by a portion of wheel 35 shown in phantom, arranged possibly opposite the first with respect to the support plate.
  • the pieces of fabric are guided, as known, by their edges: at least one of the edges being cut along the curve, projected onto the plane of the fabric, of the desired assembly and serving as a reference.
  • the guide assembly also includes an edge detector N which comprises edge detection means formed by a proportional photodetector which will be described later.
  • the signals supplied by the edge detector N are sent to an electronic device which detects the source of the signals and generates a signal which is sent to a comparator, one of the inputs of which receives a reference signal taking into account the orientation of the wheel given by the potentiometer 18.
  • the resulting signal controls a servo device comprising the servomotor 19 which controls the orientation of the wheel 9 in front of the roller 21.
  • Figure 5 is a geometric construction for understanding the operation of the guide device.
  • the straight lines D and E correspond respectively to a straight seam obtained by keeping constant the distance e from the straight edge E of the piece of fabric to the needle A.
  • This piece of fabric is driven by the claw disposed upstream of the needle, at a speed V o which is represented in intensity and direction by the vector V o applied approximately at point A, as will be explained later.
  • the tracking of a curved line is done by superimposing a rotational movement of the fabric in advance given by the claw.
  • the supposedly rigid fabric is endowed with a speed field which can be expressed by the rotation around an instantaneous center of rotation Ci, 0 2 , Os ...
  • This instantaneous center is located at the intersection of all perpendicular to the velocity vectors at each point of the fabric.
  • a point B other than the needle A, is applied via the wheel 9, a speed defined in orientation and intensity by a vector V i for example.
  • V 1 has a component V ' o with the same orientation and intensity as the vector V o applied to point A.
  • the angle a is the angle made by the diametrical plane of the wheel passing through the point of application B, it is also the angle made by the horizontal axis of the wheel with the line XX ', the point d intersection O 1 being an instantaneous center of rotation.
  • the point O 1 is the center of a curve Ci of radius equal to O, F, F being the point of intersection of the edge of the fabric with the line XX '.
  • a modification of the radius of curvature of the seam will be obtained by modification of the orientation and intensity of the speed vector V i .
  • the curve C 2 will be obtained by the application of a new speed vector V 2 which will cause a displacement of the instantaneous center of rotation in O 2 .
  • the orientation of the wheel limited on either side of the direction BH to an angle less than 45 ° depending on the importance of the horizontal axis around which rotates wheel. According to other embodiments, this angle can be greater or less, depending on the size of the spherical part of the wheel.
  • An example of the latter case corresponds to the vector V 3 .
  • the edge detector N must be positioned so that the photodetector cells observe positions 36 located on either side of the theoretical path of the edge of the part to be guided. Their position determines the distance "e" between the seam and the edge of the fabric. If the seam must have a succession of different curvatures, the position of the cells must theoretically be modified according to the progress of the seam to keep e constant. An equivalent result can be obtained using a row of cells of which only the two cells surrounding the theoretical path of the edge for the desired curvature are activated. In practice, the precision sought does not often require this correction.
  • training point B is dictated by the seam to be made and depends on the distance from this point to the nearest edge. Depending on the curvature of the seam, it can be on the other side of the straight line D passing through the needle.
  • the angular position of the drive wheel 9 is identified by the potentiometer 18 while the position of the edge of the fabric is identified by the edge position detector N comprising, according to the embodiment shown, a photoelectric sensor arranged in an enclosure 37 fixed to the arm of the machine.
  • a mirror 38 transmits a light beam on the positions 36 of the polished support plate 29 on which it is reflected.
  • the reflected beam falls on the photoelectric sensor consisting of a strip of diodes mounted on an integrated circuit, in a pitch of 0.1 mm.
  • the bar used, in the application described has 64 diodes, which allows a viewing range of 6.4 mm deemed to be sufficient.
  • the size of the diodes (0.1 mm) was chosen so that their width is less than the diameter of the threads constituting the fabric and in particular those constituting the mesh network of tulle or lace. The place of the thread can therefore be detected to the nearest 0.1 mm, which is sufficient to obtain a sewing precision of ⁇ 0.5 mm.
  • the light rays which fall on the fabric are diffused with a weak intensity while those which fall at the side or in the gaps are reflected and concentrated by the optics towards the strip of diode.
  • the result is a set of weak signals in front of the fabric and strong outside.
  • the state of the different diodes of the detector 37 (FIG. 7) is observed by a cyclic scan clocked by signals 40 from a clock and defined by synchronization signals 41 from a multiplexer 42 to form a video signal.
  • the timing diagrams of the signals, represented in FIG. 8, correspond, in order to simplify the diagram, to a strip of ten photodiodes, while the embodiment uses a strip of 64 photodiodes.
  • each level represents the illumination of a photodiode.
  • the diagram corresponds to three successive scans l, II, III triggered by the three synchronization signals A, B, C and to a single movement of the fabric, which explains the modification of the signal between each synchronization.
  • the low levels correspond to a hole in a mesh of a lace.
  • a threshold 43 is defined against which the signals are compared.
  • the comparator 44 which receives the threshold signal and the video signal, separates the levels and makes it possible to obtain an all-or-nothing signal 45.
  • comparator 44 is sent to a bi-stable flip-flop circuit 45.
  • the first presence of the fabric encountered generates a signal which switches the bistable to state 1 shown in FIG. 8, this is only reset to state 0 at the end of scanning, that is to say on the arrival of the next synchronization signal A. Consequently, only the edge of l is taken into account. 'fabric and not any holes.
  • a gate circuit 46 controlled by the output signal of the bistable allows a number of pulses of the clock signal 40 proportional to the position of the first photodiode marked by the edge of the fabric to pass.
  • a counting circuit 47 triggered by a synchronization signal 41, determines the number of pulses contained in each output signal of the bistable passing through the gate circuit 46, between two synchronization signals 41. The result of the counting is then transferred in a transfer register 48 by a transfer control circuit 49, which also ensures the reset of the counter 47, controlled by the synchronization signal after time shift.
  • the count value previously obtained is translated into voltage by a digital analog converter 50.
  • a signal proportional to the distance separating the edge of the fabric from the end of the bar is thus obtained.
  • This edge signal faithfully follows the shape obtained after cutting, including the contour of the gaps cut by the cutting line in the openwork fabrics.
  • a second signal processing is necessary to reconstruct the cutting line, and will consist in making a peak-to-peak follow-up of the edge signal, so as to skip the gaps.
  • the analog signal obtained in the first processing is sent to a correction circuit 51 which transforms it into a peak signal.
  • This correction is obtained from two time constants, a short one which quickly takes the maximum value, a longer one which makes it possible to follow the minimum acceptable curve by guiding the fabric.
  • the signal obtained at the output of the correction circuit 51 is sent to a framing circuit 52 where it is calibrated and exits in the form of a signal e 2 .
  • the signal from the angular position sensor 18 is also sent to a framing circuit 53 where it is calibrated in the form of a signal e l .
  • the signals e i and e 2 are sent in a comparison and control circuit 54 and (FIG. 9) consisting, according to the example, of at least three comparator circuits 55, 56, 57 (for example SIEMENS TCA 965) of which the outputs are associated with three relays 58, 59, 60.
  • the circuit 58 makes it possible to limit the speed of the servomotor 19 by interposing a series resistor R, and the circuits 59 and 60 define the direction of rotation ROT + and ROT- and l 'engine stop by presence at its terminals of the same polarity.
  • the comparator 55 receives the signal e, which it compares to two maximum and minimum stop values. These two values are sent to the comparator 57 which receives the values of e i and e 2 .
  • One of the relays 59 of the motor circuit is actuated by the signal e i > e 2 + ⁇ 1 , ⁇ 1 being the tripping value, the other relay 60 is actuated by the signal ei ⁇ e 2 - ⁇ 1 .
  • the motor finds the same polarity at its terminals and remains stationary, otherwise it turns in one direction or the other.
  • the comparator 56 compares the absolute value of the difference of the signals e l and e 2 with a trigger value s 2 to put or remove a speed limitation resistor on the motor circuit.
  • the tangential speed of the drive wheel varied automatically with its orientation, that is to say that the drive device included a spherical wheel driven by a roller 21 at constant speed, as previously described.

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  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)

Claims (7)

1. Führungsvorrichtung für Bahnen aus weichem Material, aus denen ein dreidimensionaler Verbund geformt wird, mit einer Antriebsvorrichtung, mit mindestens einer Stützplatte, einem Antriebsrad, das eine zu führende Bahn auf die Stützplatte drückt, Antriebsvorrichtungen für das Antriebsrad und einem Detektor zur Ermittlung der Position des Randes der Bahn, wobei der Detektor mindestens einen fotoelektrischen Detektor enthält, der für die Position des zur Führung der Bahn dienenden Randes sensibel ist und weiterhin elektronische Schaltkreise enthalten sind, die das von dem Detektor gelieferte Signal in ein Steuersignal für die Antriebsvorrichtung umsetzen, dadurch gekennzeichnet, daß die Antriebsvorrichtung ein kugelförmiges Antriebsrad (9) enthält, das freibeweglich um eine zur Stützplatte (29) parallele Achse (10) ist, die mit ihrem einen Ende an dem Ende einer um ihre Achse drehbaren Welle (14) befestigt ist, deren gedachte rechtwinklig zur Stützplatte ausgerichtete Verlängerung durch den Mittelpunkt des Rades geht; daß weiterhin eine Antriebsführungsrolle (21) mit einer Achse parallel zu der Stützplatte vorgesehen ist, die die Drehung des Rades bewirkt, wobei die Welle (14) und die Führungsrolle (21) durch dasselbe Rahmengestell (17, 20) getragen werden; und daß weiterhin Vorrichtungen zur Messung der Winkelposition (18) und zur Steuerung einer Drehung (19) an dem anderen Ende der Welle (14) vorgesehen sind.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß das Antriebsrad (9) an dem Berührungspunkt mit dem Stoff eine variable Tangentialgeschwindigkeit (V1) aufweist, die eine Funktion des Kosinus des Winkels (a) zwischen seiner senkrecht zur Achse stehenden Symmetrieebene mit der Symmetrieebene der Antriebsführungsrolle (21) bei konstanter Geschwindigkeit (Vg) ist
3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß eine Komponente V'α des Geschwindigkeitsvektors V, der Antriebsrolle (9) parallel und gleich zum Geschwindigkeitsvektor Vo der Beförderungsvorrichtung (7) ist.
4. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Positionsdetektor für den Rand (N) der Bahn einen fotoelektrischen Detektor enthält, der durch einen Sensor aus einer Leiste fotoelektrischer Dioden und einer Lichtquelle gebildet wird, wobei ein Lichtstrahl aus der Lichtquelle auf eine Stützplatte (29) reflektiert wird, auf der der Rand des Stoffes vorbeigeführt wird, daß weiterhin ein Vielfachumwandler (42) enthalten ist, der ausgehend von den Signalen jeder Diode ein Videosignal bildet, eine Vergleichsvorrichtung (43), um die Videosignale in Abhängigkeit ihres Niveaus in Ja- oder Nein-Signale zu trennen, ein bistabiler Schaukelschaltkreis (41), der aus dem Zustand 1 durch erste Anwesenheit des angetroffenen Stoffes in den Zustand 0 nach dem Ende der Überstreichung der Leiste übergeht, ein Eingangsschaltkreis (46), der eine Anzahl von Uhrimpulsen abhängig zu der Stellung der ersten Diode, die von dem Rand des Stoffes verdeckt wird, durchläßt, eine Zählschaltkreis (47), ein Transferregister (48) und ein Numerisch/Analogumformer (50), wobei die Ausgangsspannungen genau der beobachteten Kontur des Randes entsprechen, ein Lochkorrekturschaltkreis (51) das von durchbrochenen Stoffen produzierte Ausgangssignal in ein Gipfel-an-Gipfel (crete ä crete) umwandelt, ein Vergleichs- und Steuerschaltkreis (54), das von dem Korrekturschaltkreis stammende verarbeitete Signal und das Positionssignal von dem Positionssensor (18) vergleicht, um die Orientierung und die Geschwindigkeit der Antriebsvorrichtungen zu steuern.
5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß die die Leiste bildenden Fotodioden einen geringeren Durchmesser haben als die Fäden, die die Maschen des durchbrochenen Stoffes bilden.
6. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß der Vergleichs- und Steuerschaltkreis (54) des Motors drei integrierte Vergleichsschaltkreise (55, 56, 57) enthält, wobei ein erster Vergleichsschaltkreis (55) das von der Diodenleiste verarbeitete Signal (e2) empfängt und mit zwei Eckwerten, einem maximalen und einem minimalen (S1, S2) vergleicht, ein zweiter Vergleichsschaltkreis (57) die zwei vorhergehenden Eckwerte und die Signale (ei, e2) von der Diodenleiste (19) und dem Positionssensor (18) empfängt, und die Ausgänge der Vergleichsschaltkreise (55, 57) zwei Signale erzeugen, oberhalb oder unterhalb eines um einen Auslöswert (ε1) vergrößerten oder verkleinerten Referenzwerts (e2), die Relais zur Steuerung eines Stellmotors (19) für die Orientierung der Antriebsvorrichtung betätigen; wobei der dritte Vergleichsschaltkreis (56) das Signal (ei) von dem Positionssensor (18) und das Signal (e2) von der Diodenleiste mit einem Referenzwert (82) vergleicht, um einen Widerstand in den Versorgungsstromkreis des Stellmotors (19) einzuführen, zur Begrenzung seiner Geschwindigkeit.
7. Vorrichtung nach den Ansprüchen 3 oder 4, dadurch gekennzeichnet, daß das Antriebsrad (9) durch einen Stellmotor (230) in eine Drehbewegung gebracht wird, und dadurch, daß der Randdetektor einen Speisestromkreis für den Stellmotor (230) enthält, der in Abhängigkeit von der Orientierung (a) des Rades eine variable Speisespannung liefert.
EP86401500A 1985-08-02 1986-07-04 Steuereinrichtung für weiche, nichtflächige Werkstücke an Nähmaschinen Expired EP0216644B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86401500T ATE46726T1 (de) 1985-08-02 1986-07-04 Steuereinrichtung fuer weiche, nichtflaechige werkstuecke an naehmaschinen.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR8511858A FR2585683B1 (fr) 1985-08-02 1985-08-02 Dispositif d'entrainement pour ensemble de guidage de feuilles de materiau souple destinees a former un assemblage tridimensionnel
FR8511859A FR2585684B1 (fr) 1985-08-02 1985-08-02 Detecteur de position du bord d'une piece d'etoffe pour la commande d'un dispositif d'entrainement
FR8511859 1985-08-02
FR8511858 1985-08-02

Publications (2)

Publication Number Publication Date
EP0216644A1 EP0216644A1 (de) 1987-04-01
EP0216644B1 true EP0216644B1 (de) 1989-09-27

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Family Applications (1)

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EP86401500A Expired EP0216644B1 (de) 1985-08-02 1986-07-04 Steuereinrichtung für weiche, nichtflächige Werkstücke an Nähmaschinen

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US (1) US4730824A (de)
EP (1) EP0216644B1 (de)
DE (1) DE3665894D1 (de)

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DE3804576A1 (de) * 1987-03-28 1988-10-06 Heidelberger Druckmasch Ag Vorrichtung zum foerdern und ausrichten von bogen bei bogenverarbeitenden maschinen
US4825787A (en) * 1987-05-20 1989-05-02 Porter Sewing Machines, Inc. Method and apparatus for guiding fabric to a sewing machine
US4836119A (en) * 1988-03-21 1989-06-06 The Charles Stark Draper Laboratory, Inc. Sperical ball positioning apparatus for seamed limp material article assembly system
JPH0732827B2 (ja) * 1989-01-27 1995-04-12 ハムス株式会社 タコ巻縫いミシンにおける布端の振れ修正装置
FR2665191B1 (fr) * 1990-07-27 1992-11-20 Rouleau Patrick Dispositif de guidage de tissu et procede de couture automatique.
GB9019091D0 (en) * 1990-09-01 1990-10-17 British United Shoe Machinery Automatic sewing machine system
EP0848768B1 (de) * 1996-06-14 2002-03-20 Patrick Rouleau Nähmaterial-führungsvorrichtung auf gleicher höhe wie der stoffdrückerfuss angebracht, verfahren und machine zum automatischen nähen
FR2749862A1 (fr) * 1996-06-14 1997-12-19 Rouleau Patrick Dispositif de guidage de materiau a coudre applique lateralement et commande en tout ou rien, procede de couture automatique et machine a coudre
FR2749861A1 (fr) * 1996-06-14 1997-12-19 Rouleau Patrick Dispositif de guidage de materiau a coudre applique au droit du pied-presseur, procede de couture automatique et machine a coudre
EP0997567B1 (de) * 1998-10-30 2003-01-02 Johannes Sahl Nähmaschinezubehör
US20060070093A1 (en) * 2004-09-30 2006-03-30 Joy Mangano Combination candle centerpiece and side loading music CD player
JP2007014556A (ja) * 2005-07-07 2007-01-25 Ykk Corp 生地片の縁縫装置
US7444951B2 (en) * 2006-11-21 2008-11-04 Ykk Corporation Curved edge sewing systems
US8573145B2 (en) * 2010-03-18 2013-11-05 Stephen Lang Dickerson Feed mechanism that advances fabric
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US4730824A (en) 1988-03-15
DE3665894D1 (en) 1989-11-02
EP0216644A1 (de) 1987-04-01

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