EP0848768B1 - Nähmaterial-führungsvorrichtung auf gleicher höhe wie der stoffdrückerfuss angebracht, verfahren und machine zum automatischen nähen - Google Patents

Nähmaterial-führungsvorrichtung auf gleicher höhe wie der stoffdrückerfuss angebracht, verfahren und machine zum automatischen nähen Download PDF

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Publication number
EP0848768B1
EP0848768B1 EP97929357A EP97929357A EP0848768B1 EP 0848768 B1 EP0848768 B1 EP 0848768B1 EP 97929357 A EP97929357 A EP 97929357A EP 97929357 A EP97929357 A EP 97929357A EP 0848768 B1 EP0848768 B1 EP 0848768B1
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EP
European Patent Office
Prior art keywords
adjustment
unit
contact
point
entrainment
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EP97929357A
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English (en)
French (fr)
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EP0848768A1 (de
Inventor
Patrick Rouleau
Alain Rouleau
Jean-Pierre Touret
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Individual
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Individual
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Priority claimed from FR9607591A external-priority patent/FR2749861A1/fr
Priority claimed from FR9607592A external-priority patent/FR2749862A1/fr
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Publication of EP0848768A1 publication Critical patent/EP0848768A1/de
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Publication of EP0848768B1 publication Critical patent/EP0848768B1/de
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    • 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

Definitions

  • the invention relates to a device for guidance of flexible textile material (fabric, knitting, etc.) likely to be sewn on a type sewing machine traditional comprising a work-holding plate and a material feed claw mechanism, associated with minus a needle; thereafter this mechanism and its accessories will be designated by the expression "presser foot”.
  • the invention extends to an automatic sewing process for material, implemented using a sewing machine equipped with such a guide device. She's spreading also to advanced sewing machines equipped one or more guidance devices conforming to the invention.
  • EP-A-0 468 578 then proposed a guide device the roller of which is positioned above a member adjustment turn by entrainment of the material (sphere elastic) so as to come into contact with the area upper of said rotating member opposite the area of contact of said member with the material, the support zone of said roller with said rotating member being substantially located on the vertical axis around which the pivoting of said rotating member. So the material is longitudinally driven by the rotating member, so permanent, at a point of contact on the right upstream of the presser foot, and position corrections are made by orienting appropriate the direction of this training.
  • This system is satisfactory, but is nevertheless limited to guiding parts parallel to reference lines whose radius of curvature is important, especially greater than about 25 cm. So, this system is not in practice fast enough and efficient to make automatic seams parallel to lines with very pronounced curvature portions (radius of curvature less than 25 cm), even angular. Of such seams must therefore still be made manually by operators who guide the material in front and upstream of the needle.
  • FR-2,392,909 describes a device comprising several rotating rollers around a common fixed axis perpendicular to the direction drive and passing through the needle.
  • the different motors of the different rollers are controlled by a analog control which applies voltages to them that the pivot center applied by all of these pebbles coincides with the center of curvature of the edge of the sewn piece of fabric.
  • This device is not conceivable only with large pieces and leads in practice to numerous untimely wrinkling phenomena, especially in the case of flexible or stretchy fabrics.
  • it is complex, extremely delicate, if not impossible to settle satisfactorily, and requires adjustments with each change of fabric and / or shape of room.
  • US-4,813,364 describes an endless strip arranged laterally in contact along a linear surface contact parallel to the direction of training. Such device is totally ineffective in practice since the strip in contact with the fabric prevents pivoting or induces significant wrinkling of the tissue.
  • the invention therefore aims to resolve these disadvantages by proposing a device for guiding a material to be sewn parallel to a reference line, in particular an edge of the material, which may have any curvatures, and in particular strong curvatures or even angles.
  • the invention aims at especially the realization of automatic seams which can have radius of curvature significantly less than 25 cm, in particular which can take any value between a centimeter or a few centimeters, and 25 centimeters.
  • the subject of the invention is the mounting of one or many of these devices perfected on a machine sewing type known per se (with a work-holding plate and a presser foot associated with at least one needle) to allow sewing so automatic pieces of material parallel to a predefined reference line, constituted in particular by an edge of the pieces.
  • the invention applies whatever or the purpose of sewing: sewing a ribbon, a belt, elastic at the edge of the piece, seam a hem (the machine being provided with a device classic material folding), two-piece sewing together (the machine being provided with two guide) ...
  • the objective of the invention is to allow obtaining a regular seam of good quality, high cadence, including in the case of strong curvatures, whatever the material (especially knitwear or fabrics thin, difficult to handle, stretch materials %), and this, by eliminating the difficulties of implementation (such as phenomena of untimely wrinkling) to which collide with previous devices.
  • Another objective is to provide a simple structure guiding device, which, mounted on a traditional type sewing machine, allows make automatic seams on materials of any thickness, parallel to lines any, with pieces of any shape.
  • the invention relates more particularly to propose a guidance device making it possible to achieve both concave and convex curvatures (i.e. in both directions).
  • the invention further aims to provide a such a device which does not require complex adjustments to each change of material and / or shape of part, and therefore has great versatility.
  • the invention aims even more particularly to provide a guidance device to guide the material from the start of sewing and until the end of the seam of the piece of material.
  • the invention aims in particular to propose a guiding device for automatic sewing underwear (thongs, bras, tank tops, t-shirts, briefs, ).
  • the invention therefore relates to a method of automatic sewing of a piece of flexible textile material (fabric, knitting ...) using a sewing machine, in which at least one organ is permanently applied rotary adjustment in contact with the material in at least one contact point on the material laterally offset from the drive right, characterized in that one applies the adjustment member at at least one point of contact located, in operation, at least substantially at the level of the presser foot, and as you go up, you apply the organ adjustment and it is kept permanently applied to the contact of the material so that, in operation, a plane perpendicular to the work plate at the point of contact and which contains the speed direction peripheral V1 of the adjustment member at the point of contact, form with a plane perpendicular to the plate book holder at the point of contact and parallel to said training right, an angle ⁇ of fixed orientation no no.
  • the angle ⁇ of orientation is less than 90 °, in particular between 20 ° and 45 °.
  • a method according to the invention performs both convex and concave curves and the guidance is provided to the end of the workpiece material.
  • the adjustment of the material takes place on the portion of material engaged in the presser foot and is controlled by a detection carried out immediately at upstream and near the presser foot, so that eliminates any area of no guidance of the material to be the upstream of the presser foot and the reaction times are longer fast.
  • the adjusting member does not either not upstream of the presser foot, which was considered as essential in the devices of the prior art (in which the principle was to guide the piece of material before it passes under the presser foot), we with the invention obtains guidance on all the material entering the presser foot with greater efficiency and with greater precision at the presser foot.
  • the position of the portion of the reference line that passes to the right of the detection area which we use to determine whether to place the adjuster in one or the other of the states. Furthermore, when this portion of the reference line passes exactly over the area of detection and coincides with the detection line we can choose to place and maintain the adjusting member in either of the two states. We choose for example the state driven in a direct sense.
  • the couple of pivoting induced by the guide device is at least approximately proportional to the distance between the contact point and presser foot entry, distance which may be significant and no longer affects the effectiveness of the guidance as in the previous devices; of them separate phenomena are used respectively in two states: in the braked state, it is the presser foot itself which causes the material to pivot around a center of rotation passing through the point of contact, and at the state driven in the direct direction the pivoting is due to the speed difference between the material training at point of contact by the adjuster and the material drive at the presser foot; the non-zero fixed orientation angle ⁇ laterally stretches the material permanently between the point of contact and the presser foot, which greatly increases the dynamic performance avoiding any phenomenon untimely unwanted (puckering, wave effects, ).
  • the organ adjustment brakes the material at the point of contact so that it pivots.
  • the adjustment member is blocked to stop it in the braked state. Indeed, a stop command is particularly simple and quick to implement.
  • a drive motor for control the functioning and state of the organ adjustment, we drive a drive motor in all or nothing by applying it, either a training signal in direct direction, i.e. a braking signal, depending on whether detect or not the presence or absence of material.
  • the invention also relates to a device for material guidance, for the implementation of the process according to the invention.
  • the orientation angle ⁇ is less than 90 °, in particular between 20 ° and 45 °.
  • the adjusting member is also applied and mounted so that a plane which contains a straight line passing through the point of contact and through the entry of the presser foot forms an angle ⁇ of the order of 90 ° with a vertical plane which contains the training right.
  • the device according to the invention advantageously comprises means for prior adjustment of the position of the adjustment member relative to the presser foot.
  • the means drive include a drive motor, and said control means comprise a circuit electronic control in all or nothing suitable for deliver to the engine, a drive signal in the direction direct from the motor corresponding to the driven state in direction direct from the adjustment device, i.e. a braking signal of the motor corresponding to the braked state of the member adjustment, according to the state of said position signal.
  • the drive means include means for clutching / disengaging the member adjustment with respect to said motor movement.
  • the device according to the invention comprises means for braking of the adjustment member adapted to block the adjustment member in the braked state.
  • the control means are adapted for ability to control shutdown of state adjuster braked.
  • the guide device is characterized in that the means are adapted to be able to also train the retrograde adjustment member opposite to the direction direct.
  • the device comprises means for prior adjustment of the angle of orientation, so as to allow adjustment initial, in particular depending on the nature and characteristics of the material, and shapes of the line of reference.
  • the device according to the invention advantageously comprises means for prior adjustment of the position of the adjustment member relative to the presser foot.
  • the guide device is characterized in that the adjustment member is of the rotary type (wheel) and mounted free in rotation around an axis and in that the drive means include a driving member capable of be coupled in rotation to the adjusting member at least in the directly driven state, and means for drive this organ leading in direct rotation to from a motor movement, at a speed of rotation corresponding to said peripheral speed of the organ adjustment.
  • the driving member is a roller mounted to rotate around a axis so that it can be placed in abutment against the adjustment member with a view to driving it in rotation by friction contact.
  • This roller is for example coupled said drive motor of the controlled adjustment member in all or nothing.
  • the roller and the member are then advantageously adapted for have a sufficiently low rotational inertia to do not drive the motor in direct rotation when a signal to stop or change direction rotation, is applied to the motor.
  • the roller is made of light alloy, in particular aluminum alloy, and has recesses to lighten it. In this way, we prevents the motor from being driven by inertia during braked passages which take place at high speed (on the order of ten or more times per second). This feature is particularly useful in the case of a stepper motor.
  • the device comprises blowing means material upstream of the presser foot, arranged so that a draft can be applied to the material antagonistic effect to the entrainment of the material induced by the body of adjustment to the state driven in the direct direction.
  • blowing means material upstream of the presser foot arranged so that a draft can be applied to the material antagonistic effect to the entrainment of the material induced by the body of adjustment to the state driven in the direct direction.
  • the invention also relates to a sewing, especially an industrial sewing machine automatic, for example for assembling parts of finish of neck, sleeves, leg ..., characterized in that it comprises at least one guiding device according to the invention.
  • the invention also relates to a method, a guide device and a machine comprising combination of all or some of the characteristics mentioned above or below.
  • the guide device 1 shown in Figures 1 to 8 is mounted on a sewing machine 2 of the type head to the left; traditionally, this machine includes a frame 3, a work plate 4, a presser foot 5 associated with a needle 6 with their kinematics classic drive (feed mechanism with claws ...), means of distributing the wires ...
  • This machine includes a frame 3, a work plate 4, a presser foot 5 associated with a needle 6 with their kinematics classic drive (feed mechanism with claws ...), means of distributing the wires ...
  • Presser foot 5 is suitable for driving the piece of material into the longitudinal direction, along a drive line 18.
  • the guiding device according to the present invention is intended to guide the workpiece material P which rests on the work-holding plate 4 in order to allow the realization without the help of an operator of a seam parallel to the edge of the material which can be strong curvature, even angular, convex or concave.
  • This guide device 1 is carried by a pneumatic cylinder 7 whose body is secured by means of a part 8 on the frame 3 of the machine and whose rod mobile is secured by its end to a support bracket 9 of the guide device.
  • the cylinder 7 is arranged to be able to move the guide device between a working position where it is applied in contact with the material to guide it, and an inactive position where it is away from the material and the work plate 4 of so as to allow in particular the introduction of a new piece of material under the presser foot 5.
  • the work-holding plate 4 is formed of a horizontal plate, and the cylinder 7 extends vertically to move the guide device down to the contact of the material to be guided. It is nevertheless understood that the invention extends to other embodiments, including including those where the book holder plate 4 could include an inclined or vertical portion and where the guide device would be applied in contact with this portion, the jack 7 then being inclined or even horizontal. Likewise, the guide device can be placed under the book holder plate 4, or duplicated to achieve a simultaneous guidance of two layers of material, one above it, the other below the plate 4.
  • the support bracket 9 carries a member adjustment 10 which is mounted and adapted for, in position of the guide device, be applied to the contact of the material at a point of contact 12.
  • This point of contact 12 is located above the work-holding plate or, more generally, on a straight line normal to the book holder plate.
  • the application cylinder 7 applies and permanently maintains the adjusting member 10 in contact of the material, that is to say throughout the duration of the sewing of piece P.
  • this adjustment member 10 is of the rotary type and mounted free in rotation around a horizontal axis XX ', that is to say more generally parallel to the work-holding plate 4.
  • the axis XX 'and the adjusting member 10 are carried by the support bracket 9.
  • the adjusting member 10 advantageously consists of a wheel, for example a sphere of elastic material such as a hollow ball in rubber, mounted (for example by bonding a cap lateral of its surface) on a carrier shaft 11 which journalled relative to a bearing carried by the support bracket 9 so that this spherical wheel 10 is free to rotate around the axis XX 'which passes through its center.
  • Such an adjustment member 10 comes to material contact at a point of contact 12 belonging to a generator of circular drive located in a plane perpendicular to the work plate 4 and to the axis XX 'of rotation.
  • the support bracket 9 also carries a leading organ 13 able to be associated with the organ adjustment 10 in order to drive it in rotation.
  • This the driving member 13 is advantageously a mounted roller rotatable around a horizontal ZZ 'axis parallel to the axis XX 'so that it can be placed in abutment against the adjustment member 10 for driving it in rotation by friction contact.
  • the roller 13 is carried by a motor shaft 14 of an electric motor 15, the assembly being carried by the support bracket 9.
  • the motor 15 is a motor electric type step by step.
  • the engine 15 When the engine 15 is supplied with electrical energy, it rotates the roller 13 which, itself, drives the sphere 10 in rotation around its axis XX 'by friction contact.
  • the guiding device also includes an optical line detector 16 predefined reference that automatic sewing must to follow.
  • This detector 16 is of conventional type, and comprises a block 16a light transmitter / sensor and a reflective plate 16b carried by the work-carrying plate 4 immediately upstream of the presser foot 5.
  • the light source of the transmitter / sensor assembly 16a emits a light ray which is reflected by the plate 16b.
  • the sensor of the transmitter / sensor assembly 16a delivers a electrical signal whose value depends on the intensity light reflected by the plate 16b. So in the absence of material opposite this plate 16b, the electrical signal is maximum, all light being reflected back to the sensor. In the presence of material, the light is absorbed and is not reflected, and the signal electrical output from the sensor is minimum.
  • the senor which is for example a photoelectric cell, delivers an electrical signal whose value varies depending on whether the edge of the material covers the plate 16b or at otherwise do not cover it.
  • the detector 16 detects the transverse position of the edge at sew the piece of material, this edge constituting said predefined reference line.
  • the position detector 16 is therefore a presence or absence of material detector, and the photoelectric sensor constitutes generation means of a position signal with two representative states of the presence and absence of material next to the plate 16b.
  • the optical detector 16 - and more particularly the plate 16b- is associated with means for adjusting its position transverse in order to adjust the position of the seam in relation to the edge of the material.
  • the detector 16 makes it possible to detect whether a portion of the edge of the material that passes next to the area detection 16b is on one side or the other of a line, said detection line 17, parallel to the right 18 and which passes through the detection zone 16b.
  • a position detector cross of another predefined reference line by example a reflective line drawn on the piece of material.
  • detector 16 is mounted upstream of the presser foot 5 and is associated with means for generating (photoelectric cell) a signal position whose value varies depending on whether the point of intersection I of the predefined reference line with a straight line perpendicular to the detection line 17 and passing through the detection zone 16b (i.e. by the reflective plate 16b) is on one side or the other of the detection line 17.
  • the position of the point of intersection I indeed represents the position transverse from the edge of the piece of material opposite the detection zone 16b, on one side or the other of the detection line 17.
  • the detector 16 and the adjusting member 10 are arranged so that the contact point 12 and the detection line 17 are located on either side of the drive line 18.
  • the signal from detector 16 is supplied to a control circuit 19 (FIG. 9) of the motor 15.
  • the vector V2 represents the speed of the piece of material by the presser foot 5. At the point of contact 12, this training induces a training speed represented by the vector V2 '.
  • the motor 15 and roller 13 form means of the adjustment member 10, and are adapted to be able to drive this adjustment member 10 in direction direct for which the peripheral speed of this organ 10 at the point of contact 12, represented by the velocity vector V1, has a component parallel to the drive line 18, represented by the vector V1 ', which is oriented in the same direction as the direction material drive by the presser foot 5, that is to say in the same direction as the speed vector V2 material drive by the presser foot 5 ( Figures 5 and 6).
  • These drive means 13, 15 are also adapted to drive the adjustment member 10 in direction direct at a rotation speed corresponding to a peripheral speed V1 of this adjustment member 10 of which the value is greater than the component represented by the vector V2 "of the drive speed V2, at the point of contact 12 and in the direction of said speed peripheral V1. More specifically, at the point of contact 12, the adjustment member 10 driven in the direct direction locally accelerates the material with respect to the speed at which it is driven by the presser foot 5 and this acceleration is sufficient to generate a couple of pivoting according to arrow F1 ( Figure 5).
  • V1 ' is greater than V2 'in the example shown in Figure 5 where the point of contact 12 is to the right of presser foot 5. More generally, it suffices that the components V1 ', V2' at point of contact 12 of the peripheral speed V1 of the adjusting member 10 and the drive speed V2 by the presser foot 5 along a straight line perpendicular to the straight line connecting point of contact 12 and the presser foot 5, such that V1> V2 '(or V1> V2 ", V2" being the component of V2 'in the direction of V1).
  • Motor 15 and roller 13 form also training means which are adapted for place and maintain the adjustment member 10 either in the state driven in direct direction at said peripheral speed V1, either in a state, called braked state, where the speed device V1 is lower or opposite to said component V2 "of the material drive speed by the presser foot 5.
  • a 15 step electric motor for example, send a signal to the engine 15 commanding its training at a lower speed, or even stopping or its training at a speed in retrograde direction, opposite in the direct sense ( Figures 7 and 8).
  • the sphere 10 when the plate 16b of the detector 16 is covered with material, the sphere 10 is driven in forward rotation, which tends to accelerate the material (Figure 5).
  • the control circuit 19 places the motor 15 in the braked state, which tends to brake the material at the point of contact 12 and rotate it in the direction of overlap of the plate 16b.
  • the position signal changes very quickly state, since the edge of the material is always at least substantially in line with the plate 16b.
  • the sphere 10 is therefore requested at high frequency in the state driven in the forward direction and in the braked state alternately. This frequency of change of state can reach a high value, especially greater than 10 Hertz.
  • the adjustment member 10 is mounted so that the contact point 12 is offset laterally from the drive right 18, and so that, in operation, its peripheral speed V1 at the point of contact 12 maintains a fixed orientation. More general, the plane perpendicular to the work-holding plate 4 which contains the direction of the peripheral speed V1 at contact point 12, form with a perpendicular plane to the work-holding plate 4 and parallel to the right drive 18, a fixed angle of orientation ⁇ ( Figure 4) non-zero less than 90 °. This fixed angle ⁇ is also the angle formed by the axis XX 'with respect to the line 20 perpendicular to the drive line 18.
  • this orientation angle ⁇ is not zero, of so that the sphere 10 tends to extend the piece laterally of material in the directly driven state.
  • this orientation angle ⁇ is advantageously greater than 20 ° and less than 45 °. For example, it is around 40 °.
  • the part 8 associated with the frame 3 of the machine and carrying the jack 7 is provided with adjustment means prior to the angle of orientation ⁇ , i.e. it is mounted so that it can be rotated around a vertical axis with respect to the machine frame. However, in operation, this orientation angle ⁇ remains fixed and the part 8 is locked in position by everything appropriate means.
  • these adjustment means can be provided between the support bracket 9 and the cylinder rod 7.
  • the organ 10 is mounted so that the contact point 12 is located, in operation, at least substantially at right of the presser foot 5.
  • the organ 10 is mounted so that a plane perpendicular to the work-holding plate 4 which contains a straight line passing through the point of contact 12 and through the inlet 21 of the presser foot 5 forms an angle ⁇ of the order 90 ° with a plane perpendicular to the work plate 4 which contains the drive line 18 (figure 4).
  • the angle ⁇ is significantly less than 90 °, the effectiveness of the guidance device in the braked state is reduced or even canceled. Indeed, the presser foot 5 very quickly tends to exert incompatible traction with the braking of the material at the point of contact 12. From even, if the angle ⁇ is significantly greater than 90 °, and in particular from around 100 °, the guidance is no longer effective in the driven state direct since the material acceleration intervenes downstream of the presser foot 5, at a point which does not allow the part to pivot.
  • the guide device according to the invention is placed at least substantially to the right of entrance 21 of the presser foot 5 and reaches its maximum efficiency for this position. In this way, it is possible to realize both concave seams ( Figures 5 and 6) and convex ( Figures 7 and 8) with great efficiency and great guidance precision.
  • the device according to the invention comprises advantageously means 28, 29, 30 for adjusting the position of the contact point 12 relative to the presser foot, and in particular adjustment means 28, 29, 30 said angle ⁇ .
  • the part 8 carrying the cylinder 7 vertical and the support bracket 9 can be mounted by compared to the frame 3 of the machine via a horizontal slide system 29 integral with the part 8 and with a threaded rod 28 fixed on this frame 3, the position of the part 8 along the rod 28 can be adjusted by example by nuts 30 (one on each side of the part 8 to block it).
  • the device according to the invention includes means (not shown) for move support piece 8 upstream before start sewing and presser foot training so that the adjustment member 10 comes into contact with the tissue.
  • These means are also suitable for moving again downstream support piece 8, simultaneously with start of sewing, with a speed slightly lower than the drive speed V2 by the presser foot until the adjusting member 10 returns to its normal position substantially to the right of the presser foot.
  • These displacements can be obtained simply thanks to a horizontal double acting pneumatic cylinder (not shown) mounted on the frame to move the support piece 8 horizontally and at least substantially parallel to the direction of training.
  • the control circuit 19 includes a electronic control circuit 22 in all or nothing which receives the position signal delivered by the detector 16, analyze this signal to determine if it corresponds to a presence or absence of material (by comparing the analog electrical signal received at a threshold), and elaborates a two-state signal corresponding respectively to the direct drive state and braked state of the adjustment member 10.
  • this electronic circuit of piloting 22 delivers either a drive signal in direction direct from the motor 15 able to place the adjustment member 10 in the directly driven state, a signal of braking of the motor 15 able to place the adjustment member 10 in braked state, depending on the state of the position signal delivered by the detector 16.
  • the signal delivered by the control 22 is supplied to a motor control card 23 15 step by step.
  • This control card 23 develops and supplies to the motor 15 an electrical supply (in the form frequency pulses proportional to the speed of rotation sought) corresponding to the state determined by the control circuit 22, in which the member 10 should be placed.
  • control circuit 19 receives a signal representative of the value of the speed V2 of entrainment of the material by the presser foot 5, and the control board 23 is adapted to deliver a direct drive signal such as that the value of the peripheral speed V1 of the organ adjustment 10 is in constant relation with the drive speed V2. In this way, we can ensure that V1 '> V2' whatever the value of V2, which can possibly be adjustable and vary.
  • the means of the adjustment member 10 can include means for clutching / disengaging the member adjustment 10 with respect to a motor movement. So, you can use the main motor of the sewing machine to drive the adjustment member 10 and provide a clutch / brake device in the kinematics of transmission.
  • a clutch / brake control electric can be provided on the rotary shaft 14 bearing the roller 13, this clutch / brake device receiving the motor movement on one side and transmitting it or not to the shaft carrying the roller 13 on the other side.
  • the roller 13 and the adjusting member 10 are adapted to have as low an inertia as possible, including enough rotational inertia weak so as not to drive the motor 15 by inertia forward rotation when a stop signal or backward rotation, or more generally a signal to change direction of rotation, is applied to motor 15. It is indeed necessary to prevent the motor 15, especially in the case of a stepping motor, does not lose its reference in rotation due to the inertia in rotation of the roller 13 and / or sphere 10.
  • the roller 13 is made of light alloy, especially of alloy aluminum and / or with lights and recesses for lighten.
  • the guide device also includes means 26 for blowing the material upstream of the presser foot 5, arranged so as to be able to apply a air flow on the antagonistic effect material to the entrainment of the material induced by the adjustment member 10 in the directly driven state.
  • a nozzle 26 for blowing air tablet which opens immediately upstream of the presser foot 5 and blows an air current upstream and into a direction substantially parallel to that of speed V1 (angle ⁇ with respect to the direction of drive) for spread the material before entering the presser foot 5. This draft tends to unwind the edge of the material, place it on plate 4, and extend the portion of material upstream of the presser foot in the opposite direction to one in which the material is entrained by the sphere 10 at contact point 12.
  • a blowing nozzle 31 is provided for open out between the shafts 11, 14 carrying the roller 13 and sphere 10, so as to extend the material immediately downstream of the point of contact 12 in the direction of the peripheral speed V1 of training by the sphere 10. We avoids jams and wrinkles each time rotation of the sphere 10 in the direct direction.
  • a suction mouth lateral 27 is arranged on the side of the entrance 21 of the presser foot, opposite the adjusting member 10. This mouth 27 is located on the side of the wafer. detection 16b, and allows to press the edge of the material on this plate 16b avoiding creases. If necessary (variant not shown), a guide, for example in the form caliper with opening oriented laterally towards the plate 16b, can be provided immediately on the side of the plate 16b to improve the precision of the guidance of the edge of the material opposite the plate 16b.
  • the minimum radius of curvature can be carried out automatically by the guide device the invention depends on the difference between the speed V1 direct drive device of the sphere 10 and the drive speed V2 of the presser foot 5 as explained above, as well as the distance between the contact point 12 and the presser foot 5. Nevertheless, it is possible to achieve concave radii of curvature as small as possible, even concave angles in decreasing the speed V2 of driving by the presser foot 5, or even by stopping this training. To do this, we don't does not depend on the value of the speed V1 of the sphere 10 of that of the speed V2 drive.
  • the device has a second detector 24 optical, similar to detector 16, which is located the opposite of the detection line 17 with respect to the organ adjustment 10.
  • This second detector 24 has the function detect the presence of the edge of the piece of material P in the case of concave curves with extremely curvature pronounced or angular. If this detector 24 is covered with material it transmits a signal corresponding to a circuit of the V2 presser foot speed control 5, and this control circuit decreases or cancels the speed V2.
  • the state directly driven includes not only a state driven in a direct direction at a nominal speed V1 little more than V2 "(or V1 'little more than V2'), but also a state driven in direct direction at high speed at a speed V1 much higher than V2 ", for example from the order of double or triple V2 ".
  • the adjustment member 10 can be controlled at the state driven in a direct direction at high speed when the second detector 24 is covered. This is particularly advantageous in the case of borders of concave parts with obtuse angles. To do this, just provide the stepper motor 15 with frequency signals greater, for example, double or triple the frequency controlling the nominal speed. So in the state driven in the forward direction, the value of speed V1 device is not always the same, and may vary between various values. The same applies to the relationship between the value of the peripheral speed V1 of the organ adjustment 10 and that of the drive speed V2.
  • a third detector 25 which, when discovered, transmits a signal to the V2 speed control which stops or brakes the presser foot 5 drive, so that the piece of material can be rotated in the direction of arrow F2 by retrograde direction of the sphere 10 until its edge comes to cover again this third detector 25. It is easy to understand that the radius of curvature of the convex curves obtainable automatically can be extremely weak or even angular thanks in particular to such a detector 25.
  • a seam is made on along a concave edge of strong curvature of the piece P in sewing piece E which is for example a neckline round.
  • the plate 16b is covered and the point I of intersection between the edge of the material and a straight line that goes through the detection zone 16b and which is perpendicular to the detection line, is on the side opposite the point of contact 12 with respect to the detection line 17.
  • the adjustment member 10 is then driven in the direct direction at the peripheral speed V1.
  • the peripheral speed V1 of the adjustment member 10 has a component V1 'according to the direction of training which is oriented downstream, that is to say in the same direction as speed V2 presser foot 5. Workpiece P tends to rotate according to arrow F1 until the plate 16b is discovered, after which the adjustment member 10 will be placed in the braked state, for example by stopping the engine 15.
  • the invention makes it possible in particular to perform high-speed automatic stitching with a high sewing precision and with radii of curvature any, especially very weak. She is in particular applicable to the automatic installation of parts E neckline and allows the realization of V-necks or collar with small radius of curvature.
  • the adjustment member arranged to the right of the presser foot can be realized in the form a circular wheel, an endless belt ... and come to contact of the material at several points of contact, or even according to a surface contact zone (which is offset laterally and at least substantially in line with the presser foot).
  • several adjustment bodies can be provided (for example one in the direct direction, one in retrograde direction, or one on each side of the presser foot and from the right of drive 18 ).
  • the invention is applicable to a left head sewing machine or head right.

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

Claims (23)

  1. Vorrichtung zum Führen von zu nähendem elastischem Textilmaterial (Gewebe, Trikot ...) auf einer Nähmaschine mit einer Arbeitsplatte (4) und einem Stoffdrückerfuß (5) zum Mitnehmen des Materials in einer Längsmitnahmerichtung in Verbindung mit wenigstens einer Nadel (6), damit das Material automatisch genäht werden kann, wobei die Führungsvorrichtung folgendes umfasst:
    wenigstens einen Mechanismus (10) zum Einstellen der Querposition des Materials, der drehbar und so montiert ist, dass er mit dem Material in Kontakt kommt, und der so gestaltet ist, dass er die Mitnahmegeschwindigkeit des Materials örtlich ändern kann, wenn er auf das Material aufgebracht wird,
    ein Mittel (7), um den Einstellmechanismus (10) dauerhaft in Kontakt mit dem Material an einem Kontaktpunkt (12) zu bringen, der seitlich von einer Geraden (18) verschoben ist, wobei die genannte Mitnahmegerade den Stoffdrückerfuß (5) parallel zur Längsmitnahmerichtung passiert,
    dadurch gekennzeichnet, dass das Mittel (7) zum Aufbringen so ausgestaltet und der Einstellmechanismus (10) so montiert ist, dass:
    der genannte Kontaktpunkt (12) sich im Betrieb wenigstens im Wesentlichen auf gleicher Höhe wie der Stoffdrückerfuß (5) befindet;
    im Betrieb eine Ebene lotrecht zur Arbeitsplatte (4) am Kontaktpunkt (12), die die Richtung der Umfangsgeschwindigkeit (V1) des Einstellmechanismus am Kontaktpunkt (12) beinhaltet, mit einer lotrechten Ebene zur Arbeitsplatte am Kontaktpunkt und parallel zu der genannten Mitnahmegeraden (18) einen Ausrichtungswinkel (α) bildet, der nicht null ist.
  2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass der Ausrichtungswinkel (α) kleiner als 90° ist.
  3. Vorrichtung nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, dass der Ausrichtungswinkel (α) zwischen 20° und 45° liegt.
  4. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass sie Regelmittel vor dem Ausrichtungswinkel (α) aufweist.
  5. Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der Einstellmechanismus (10) so montiert ist, dass eine Ebene lotrecht zur Arbeitsplatte (4), die eine Gerade (20) aufweist, die durch den genannten Kontaktpunkt (12) und durch den Eingang (21) des Stoffdrückerfußes (5) verläuft, einen Winkel (β) in der Größenordnung von 90° mit einer Ebene lotrecht zur Arbeitsplatte bildet, die die Mitnehmergerade (18) enthält.
  6. Vorrichtung nach einem der Ansprüche 1 bis 5 zum automatischen Nähen des Materials parallel zu einer vordefinierten Referenzlinie, umfassend:
    Mitnahmemittel (13, 15), um den Einstellmechanismus (10) aufgrund einer durch einen Motor (15) erzeugten Antriebsbewegung in Rotation in wenigstens einer Richtung, als Direktrichtung bezeichnet, für die die Umfangsgeschwindigkeit (V1) des Einstellmechanismus (10) am Kontaktpunkt (12) eine Komponente (V1') gemäß der Mitnahmerichtung darstellt, die in der Mitnahmerichtung des Materials durch den Stoffdrückerfuß (5) ausgerichtet ist,
    einen Detektor (16) der Querposition der genannten vordefinierten Referenzlinie, die oberhalb des Stoffdrückerfußes (5) montiert und mit Mitteln zum Erzeugen eines Positionssignals verbunden ist, dessen Wert je nach dem variiert, ob sich die genannte vordefinierte Referenzlinie auf der einen oder der anderen Seite einer Geraden (17) befindet, wobei die genannte Erfassungslinie, die den Detektor (16) passiert, parallel zur Mitnahmegeraden (18) verläuft, wobei die genannte Vorrichtung dadurch gekennzeichnet ist, dass:
    die Mitnahmemittel (13, 15) so gestaltet sind, dass sie den Einstellmechanismus (10) in der Direktrichtung mit einer-Umfangsgeschwindigkeit (V1) des Einstellmechanismus (10) am Kontaktpunkt (12) mitnehmen kann, die größer ist als die Komponente (V2") am Kontaktpunkt (12), und in der Richtung der genannten Umfangsgeschwindigkeit (V1) der Mitnahmegeschwindigkeit (V2) des Materials durch den Stoffdrückerfuß (5),
    die genannten Mitnahmemittel (13, 15) des Einstellmechanismus (10) so gestaltet sind, dass sie den Einstellmechanismus (10) in einen der folgenden Zustände bringen und ihn dort halten: einen Zustand, als Mitnahmezustand in Direktrichtung bezeichnet, in dem er von den Mitnahmemitteln (13, 15) mit der genannten Umfangsgeschwindigkeit (V1) in Direktrichtung mitgenommen wird; und einen Zustand, als Bremszustand genannt, in dem die genannte Umfangsgeschwindigkeit (V1) geringer ist oder in der entgegengesetzten Richtung zu der genannten Komponente (V2") der Mitnahmegeschwindigkeit (V2) des Materials durch den Stoffdrückerfuß (5) wirkt,
    sie ein Ein-Aus-Steuermittel (19) zum Steuern der Mitnahmemittel (13, 15) in Abhängigkeit vom Wert des genannten Positionssignals umfasst:
    im Mitnahmezustand in der Direktrichtung des Einstellmechanismus (10), wenn sich der genannte Kontaktpunkt (12) und die genannte vordefinierte Referenzlinie auf verschiedenen Seiten der Erfassungslinie (17) befinden, wodurch das Material am Kontaktpunkt (12) durch den Einstellmechanismus (10) beschleunigt und somit schwenkend in einer Richtung (F1) in Bezug auf die Arbeitsplatte (4) mitgenommen wird,
    im Bremszustand des Einstellmechanismus (10), wenn sich der genannte Kontaktpunkt (12) und die genannte vordefinierte Referenzlinie auf derselben Seite der Erfassungslinie (17) befinden, wodurch das Material an dem genannten Kontaktpunkt (12) durch das Einstellorgan (10) gebremst und somit schwenkend in der anderen Richtung (F2) in Bezug auf die Arbeitsplatte (4) mitgenommen wird.
  7. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, dass sie Bremsmittel des Einstellmechanismus (10) aufweist, die so gestaltet sind, dass sie den Einstellmechanismus (10) im Bremszustand blockieren.
  8. Vorrichtung nach einem der Ansprüche 6 und 7, dadurch gekennzeichnet, dass die Mitnahmemittel (13, 15) so gestaltet sind, dass sie den Einstellmechanismus (10) in der der Direktrichtung entgegengesetzten Rückwärtsrichtung mitnehmen können.
  9. Vorrichtung nach einem der Ansprüche 6 bis 8, dadurch gekennzeichnet, dass die Mitnahmemittel (13, 15) einen Mitnahmemotor (15) umfassen, und dadurch, dass das genannte Steuermittel (19) eine elektronische Ein-Aus-Pilotschaltung (22) aufweist, die die Aufgabe hat, entweder ein Mitnahmesignal in Direktrichtung des Motors (15) entsprechend dem Mitnahmezustand in Direktrichtung des Einstellmechanismus (10) oder ein Bremssignal des Motors (15) anzulegen, das dem Bremszustand des Einstellmechanismus (10) gemäß dem Zustand des genannten Positionssignals entspricht.
  10. Vorrichtung nach einem der Ansprüche 6 bis 9, dadurch gekennzeichnet, dass der Einstellmechanismus (10) ein Rotationstyp und so montiert ist, dass er sich frei um eine Achse (XX') drehen kann, und dadurch, dass die Mitnahmemittel (13, 15) einen Antriebsmechanismus (13) umfassen, der in Rotation wenigstens im Mitnahmezustand in Direktrichtung mit dem Einstellmechanismus (10) verbunden werden kann, und ein Mittel zum Mitnehmen dieses Antriebsmechanismus in Rotation in Direktrichtung durch einen Antriebsmotor mit einer Rotationsgeschwindigkeit, die der genannten Umfangsgeschwindigkeit (V1) des Einstellmechanismus (10) entspricht.
  11. Vorrichtung nach Anspruch 10, dadurch gekennzeichnet, dass der Antriebsmechanismus (13) eine Rolle ist, die sich so um eine Achse (ZZ') dreht, dass sie gegen den Einstellmechanismus (10) drücken kann, um diesen durch Reibkontakt in Drehung zu versetzen.
  12. Vorrichtung nach einem der Ansprüche 9 und 11, dadurch gekennzeichnet, dass die Rolle (13) in Rotation mit dem genannten Motor (15) verbunden werden kann, und dadurch, dass die Rolle (13) und der Einstellmechanismus (10) so gestaltet sind, dass sie eine Rotationsträgheit aufweisen, die so schwach ist, dass sie den Rotationsmotor (15) nicht in Direktrichtung mitnehmen, wenn ein Signal zum Halten oder zum Ändern der Rotationsrichtung an den Motor (15) angelegt wird.
  13. Vorrichtung nach Anspruch 12, dadurch gekennzeichnet, dass die Rolle (13) aus einer Leichtmetalllegierung, insbesondere einer Aluminiumlegierung besteht.
  14. Vorrichtung nach einem der Ansprüche 1 bis 13, die ein automatisches Nähen eines Stücks Materials entlang eines seiner Ränder zulässt, die die genannte vordefinierte Referenzlinie bilden, dadurch gekennzeichnet, dass:
    der Positionsdetektor (16) ein Detektor für die Anwesenheit oder Abwesenheit von Material ist, der mit Mitteln zum Erzeugen eines Positionssignals in zwei Zuständen verbunden ist, die für die Anwesenheit oder Abwesenheit von Material repräsentativ sind,
    das Steuermittel (19) die Mitnahmemittel (13, 15) abwechselnd vom Mitnahmezustand in Direktrichtung in den Bremszustand oder-umgekehrt je nach Zustand und bei jeder Zustandsänderung des Positionssignals steuert.
  15. Vorrichtung nach einem der Ansprüche 1 bis 14, dadurch gekennzeichnet, dass sie ein Mittel (26) zum Blasen des Materials oberhalb des Stoffdrückerfußes (5) aufweist, wobei das Mittel so angeordnet ist, dass es einen Luftstrom auf das Material aufbringt, der die entgegengesetzte Wirkung zur Mitnahme des Materials hat, die durch den Einstellmechanismus (10) im Mitnahmezustand in Direktrichtung bewirkt wird.
  16. Nähmaschine, dadurch gekennzeichnet, dass sie wenigstens eine Führungsvorrichtung nach einem der Ansprüche 1 bis 15 aufweist.
  17. Verfahren zum automatischen Nähen eines Stücks elastisches Textilmaterial (Gewebe, Trikot ...) mit einer Nähmaschine, bei dem dauerhaft wenigstens ein drehbarer Einstellmechanismus (10) in Kontakt mit dem Material an wenigstens einem Kontaktpunkt (12) auf dem Material angewendet wird, der seitlich zur Mitnahmegeraden (18) versetzt ist, dadurch gekennzeichnet, dass der Einstellmechanismus (10) wenigstens an einem Kontaktpunkt (12) aufgebracht wird, der sich im Betrieb wenigstens im Wesentlichen auf gleicher Höhe wie der Stoffdrückerfuß (5) befindet, und dadurch, dass der Einstellmechanismus (10) in Kontakt mit dem Material gebracht und dauerhaft mit diesem Material in Kontakt gehalten wird, so dass im Betrieb eine Ebene lotrecht zur Arbeitsplatte (4) am Kontaktpunkt (12) in der Richtung der Umfangsgeschwindigkeit (V1) des Einstellmechanismus am Kontaktpunkt (12) mit einer Ebene lotrecht zur Arbeitsplatte am Kontaktpunkt und parallel zur genannten Mitnahmegerade (18) einen Ausrichtungswinkel (α) bildet, der nicht null ist.
  18. Verfahren nach Anspruch 17, dadurch gekennzeichnet, dass der Ausrichtungswinkel (α) kleiner als 90° ist.
  19. Verfahren nach einem der Ansprüche 17 und 18, dadurch gekennzeichnet, dass der Ausrichtungswinkel (α) zwischen 20° und 45° liegt.
  20. Verfahren nach einem der Ansprüche 17 bis 19, dadurch gekennzeichnet, dass der Einstellmechanismus (10) an einem Kontaktpunkt (12) aufgebracht wird, der so positioniert ist, dass eine Ebene lotrecht zur Arbeitsplatte, die eine durch den genannten Kontaktpunkt (12) und durch den Eingang (21) des Stoffdrückerfußes (5) verlaufende Gerade (20) beinhaltet, einen Winkel (β) in der Größenordnung von 90° mit einer Ebene lotrecht zur Arbeitsplatte bildet, die die Mitnahmegerade (18) beinhaltet.
  21. Verfahren nach einem der Ansprüche 17 bis 20, bei dem die Querposition einer vordefinierten Referenzlinie des Materials in einer Erkennungszone (16b) oberhalb des Stoffdrückerfußes (5) erfasst und ein Positionssignal erzeugt wird, dessen Wert gemäß der genannten vordefinierten Referenzlinie auf der einen oder der anderen Seite einer Geraden variiert, wobei die genannte Erkennungslinie (17) durch die Erkennungszone (16b) und parallel zur Mitnahmegeraden (18) verläuft, dadurch gekennzeichnet, dass:
    der Einstellmechanismus (10) in Abhängigkeit vom Wert des Positionssignals in einen der folgenden beiden Zustände gebracht und dort gehalten wird: einen Mitnahmezustand in Rotation in Direktrichtung; und einen Bremszustand,
    im Mitnahmezustand in Direktrichtung der Einstellmechanismus (10) mit einer Geschwindigkeit mitgenommen wird, die einer Umfangsgeschwindigkeit (V1) des Einstellmechanismus (10) am Kontaktpunkt (12) entspricht, die größer ist als die Komponente (V2"), am Kontaktpunkt (12) und in Richtung der genannten Umfangsgeschwindigkeit (V1), der Mitnahmegeschwindigkeit (V2) des Materials durch den Stoffdrückerfuß (5),
    im Bremszustand die Mitnahme des Einstellmechanismus (10) so gesteuert wird, dass die genannte Umfangsgeschwindigkeit (V1) geringer ist oder in der entgegengesetzten Richtung zu der genannten Komponente (V2") der Mitnahmegeschwindigkeit (V2) des Materials durch den Stoffdrückerfuß (5) wirkt,
    der Einstellmechanismus (10) in den Mitnahmezustand in Rotation in Direktrichtung gesetzt und dort gehalten wird, wenn der genannte Kontaktpunkt (12) und die genannte vordefinierte Referenzlinie sich auf verschiedenen Seiten einer Geraden (17) befinden, Erkennungslinie genannt, die durch den Detektor (16) und parallel zur Mitnahmegeraden (18) verläuft, wodurch das Material am genannten Kontaktpunkt (12) durch den Einstellmechanismus (10) beschleunigt und somit in einer Richtung (F1) relativ zur Arbeitsplatte (4) schwenkend mitgenommen wird,
    der Einstellmechanismus (10) in den Bremszustand gesetzt und dort gehalten wird, wenn sich der genannte Kontaktpunkt (12) und die genannte vordefinierte Referenzlinie auf derselben Seite der Erkennungslinie (17) befinden, wodurch das Material an dem genannten Kontaktpunkt (12) durch den Einstellmechanismus (10) gebremst und somit in der anderen Richtung (F2) in Bezug auf die Arbeitsplatte (4) schwenkend mitgenommen wird.
  22. Verfahren nach Anspruch 21, dadurch gekennzeichnet, dass der Einstellmechanismus (10) blockiert wird, um im Bremszustand anzuhalten.
  23. Verfahren nach einem der Ansprüche 21 und 22 zum automatischen Nähen eines Stücks Material entlang eines seiner Ränder, die die genannte vordefinierte Referenzlinie bilden, dadurch gekennzeichnet, dass:
    die Anwesenheit oder Abwesenheit von Material in wenigstens einer Erkennungszone (16b) erfasst wird, die sich oberhalb des Stoffdrückerfußes (5) auf der Trajektorie befindet, die durch den zu erkennenden Rand vorgegeben wird,
    ein Positionssignal in zwei Zuständen erzeugt wird, das für die Anwesenheit oder die Abwesenheit von Material repräsentativ ist,
    die Zustandsänderung des Einstellmechanismus (10) wechselweise vom Mitnahmezustand in Direktrichtung in den Bremszustand oder umgekehrt je nach Zustand und bei jeder Zustandsänderung des Positionssignals gesteuert wird.
EP97929357A 1996-06-14 1997-06-13 Nähmaterial-führungsvorrichtung auf gleicher höhe wie der stoffdrückerfuss angebracht, verfahren und machine zum automatischen nähen Expired - Lifetime EP0848768B1 (de)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
FR9607591 1996-06-14
FR9607591A FR2749861A1 (fr) 1996-06-14 1996-06-14 Dispositif de guidage de materiau a coudre applique au droit du pied-presseur, procede de couture automatique et machine a coudre
FR9607592A FR2749862A1 (fr) 1996-06-14 1996-06-14 Dispositif de guidage de materiau a coudre applique lateralement et commande en tout ou rien, procede de couture automatique et machine a coudre
FR9607592 1996-06-14
PCT/FR1997/001079 WO1997047797A1 (fr) 1996-06-14 1997-06-13 Dispositif de guidage de materiau a coudre applique au droit du pied-presseur, procede de couture automatique et machine a coudre

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EP0848768A1 EP0848768A1 (de) 1998-06-24
EP0848768B1 true EP0848768B1 (de) 2002-03-20

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EP0848768A1 (de) 1998-06-24
WO1997047797A1 (fr) 1997-12-18

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