EP0848768A1 - Dispositif de guidage de materiau a coudre applique au droit du pied-presseur, procede de couture automatique et machine a coudre - Google Patents
Dispositif de guidage de materiau a coudre applique au droit du pied-presseur, procede de couture automatique et machine a coudreInfo
- Publication number
- EP0848768A1 EP0848768A1 EP97929357A EP97929357A EP0848768A1 EP 0848768 A1 EP0848768 A1 EP 0848768A1 EP 97929357 A EP97929357 A EP 97929357A EP 97929357 A EP97929357 A EP 97929357A EP 0848768 A1 EP0848768 A1 EP 0848768A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- adjustment member
- drive
- state
- contact
- presser foot
- 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
Links
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
Definitions
- the invention relates to a device for guiding flexible textile material (fabric, knitting, etc.) capable of being sewn on a traditional type sewing machine comprising a work-holding plate and a mechanism with claws for advancing the material, associated with at least one needle; thereafter this mechanism and its accessories will be designated by the expression "presser foot”.
- the invention extends to an automatic material sewing process, implemented by means of a sewing machine equipped with such a guide device. It also extends to improved sewing machines equipped with one or more guide devices according to the invention.
- a guide device which comprises a spherical wheel bearing against the material upstream of the presser foot and rotating in a single direction of rotation to ensure driving and guiding the material upstream of the sewing area.
- This device is of a principle radically different from other prior systems in that, in these patents, the spherical wheel is offset laterally, drives the material in the same direction as the presser foot, but is pivotally mounted around a vertical axis so as to be able to orient it by means of a proportional analog type control according to different drive directions enabling the material to be brought back to the desired position.
- the spherical wheel is rotated by friction by a roller which comes to bear on one side thereof in the horizontal plane containing the axis of said wheel.
- EP-A-0 468 578 then proposed a guide device, the roller of which is positioned above a rotating adjustment member by entrainment of the material (elastic sphere) so as to come into abutment with the upper zone of said rotating member opposite the zone of contact of said member with the material, the bearing area of said roller with said rotating member being substantially situated on the vertical axis around which the pivoting of said rotating member takes place .
- the material is longitudinally driven by the rotating member, permanently, at a contact point located on the drive line upstream of the presser foot, and the position corrections are carried out by orienting so 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 large, in particular greater than about 25 cm.
- this system is not in practice fast and efficient enough to produce automatic seams parallel to lines having portions of very pronounced curvature (radius of curvature less than 25 cm), or even angular. Such seams must therefore still be carried out manually by operators who guide the material. in front and upstream of the needle.
- FR-2,392,909 describes a device comprising several rollers rotating around a common fixed axis perpendicular to the drive direction and passing through the needle.
- the different motors of the different rollers are controlled by an analog control which applies voltages to them such that the center of pivoting applied by all of these rollers coincides with the center of curvature of the edge of the sewn piece of fabric.
- This device is only conceivable with large width pieces and leads in practice to numerous phenomena of untimely pleating, in particular in the case of flexible or stretchy fabrics.
- it is complex, extremely delicate, if not impossible to adjust satisfactorily, and requires adjustments with each change of fabric and / or shape of piece.
- US-4,813,364 describes an endless band disposed laterally in contact along a linear contact surface parallel to the drive direction. Such a device is totally ineffective in practice since the strip in contact with the fabric prevents any pivoting or induces significant folding of the fabric.
- 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 relates in particular to the production of automatic seams which may have radii of curvature significantly less than 25 cm, in particular which may take any value between a centimeter or a few centimeters, and 25 centimeters.
- the subject of the invention is the mounting of one or more of these improved devices on a sewing machine of a type known per se (provided with a work-holding plate and a presser foot associated with at least one needle) in order to allow the pieces of material to be sewn automatically parallel to a predefined reference line, constituted in particular by an edge of the pieces.
- the invention applies regardless of the purpose of sewing: sewing a ribbon, a belt, an elastic band at the edge of the workpiece, sewing a hem (the machine being provided with a device conventional material folding), sewing two pieces together (the machine being provided with two guide devices) ...
- the objective of the invention is to allow obtaining a regular seam of good quality, at high speed, including in the case of strong curvatures, whatever the material (in particular knitted fabrics or fine fabrics, difficult to handle. , extensible materials ...), and this, by eliminating the difficulties of implementation (such as untimely wrinkling phenomena) which the prior devices collide with.
- Another objective is to provide a guiding device of simple structure, which, mounted on a sewing machine of the traditional type, makes it possible to carry out automatic seams on materials of any thickness, parallel to any lines, with pieces of any shapes.
- the invention aims more particularly Lier to provide a guide device for producing both concave and convex curvatures (that is to say in both directions).
- the invention further aims to propose such a device which does not require complex adjustments each time the materials and / or shape of the part is changed, and therefore has great versatility.
- the invention aims more particularly to provide a guide device for guiding the material from the start of sewing and until the end of sewing of the piece of material.
- the invention aims in particular to propose a guide device allowing the automatic sewing of underwear (thongs, bras, tank tops, T-shirts, briefs, etc.).
- presser foot assembly of the conventional mechanism ensuring the guidance and the advance of the material at the level of the needle
- upstream and downstream are used with reference to the direction of entrainment of the piece of material by the presser foot
- drive straight straight parallel to the longitudinal direction of drive by the presser foot and passing through the presser foot.
- the invention therefore relates to an automatic method of sewing a piece of flexible textile material (fabric, knitting, etc.) by means of a sewing machine, in which at least one rotary adjustment member is permanently applied to the contact of the material at at least one contact point on the material offset laterally from the drive line, characterized in that the adjustment member is applied at at least one contact point located, in operation, at least substantially to the right of the presser foot, and in that one goes up, the adjustment member is applied and it is kept permanently applied in contact with the material so that, in operation, a plane perpendicular to the work-holding plate at the point of contact and which contains the direction of the peripheral speed VI of the adjusting member at the point of contact, forms with a plane perpendicular to the work-holding plate at the point of contact and parallel to said driving straight line, an angle non-zero fixed orientation.
- the angle ⁇ of orientation is less than 90 °, in particular between 20 ° and 45 °.
- the adjustment member is mounted on the machine and it is applied at a contact point situated such that a vertical plane which contains a straight line passing through the contact point and through the entry of the presser foot forms an angle ⁇ of the order of 90 ° with a vertical plane which contains the drive line.
- the invention further relates to a method in which the transverse position of a predefined reference line of the material is detected in a detection zone upstream of the presser foot and a signal is generated. position whose value varies depending on whether said predefined reference line is on one side or the other of a straight line, called detection line passing through the detection zone and parallel to the drive line, characterized in what:
- the adjustment member is placed and maintained in one of the following two states, depending on the value of the position signal: a state driven in rotation in the forward direction; and a braked state, - in the directly driven state, the adjustment member is driven at a speed corresponding to a peripheral speed V1 of the adjustment member at the contact point which is greater than the component V2 ", at the point of contact and in the direction of said peripheral speed V1, of the speed of drive V2 of the material by the presser foot,
- the drive of the adjustment member is controlled so that said peripheral speed V1 is less than or in the direction opposite to said component V2 "of the drive speed V2 of the material by the presser foot ,
- the adjustment member is placed and maintained in the state driven in direct rotation when said contact point and said predefined reference line are on either side of a straight line, called the detection line , passing through the detector and parallel to the drive line, whereby the material is accelerated, at said point of contact, by the adjustment member, and therefore driven in pivoting in a direction FI relative to the carrier plate -work,
- the adjustment member is placed and maintained in the braked state when said contact point and said predefined reference line are located on the same side of the detection line, whereby the material is braked, at said point contact, by the adjustment member, and therefore pivoted in the other direction F2 relative to the work-holding plate.
- the process according to the invention is more particularly applicable to the execution of an automatic sewing of a piece of material along one of its edges constituting a predefined reference line, and is characterized in that: - the presence or absence of material is detected in at least one detection zone located immediately upstream, and preferably in the immediate vicinity of the presser foot, on the planned path of the edge to be detected, - a position signal is generated in two states representative of the presence or the absence of material,
- the change of state of the adjustment member is controlled alternately from the directly driven state to the braked state, or vice versa, depending on the state and each time the state of the position signal changes.
- both convex and concave curves are produced and guidance is provided up to the end of the piece of 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 upstream and near the presser foot, so that any zone of absence of material guidance upstream of the presser foot and reaction times are faster.
- the adjustment member is not upstream of the presser foot, which was considered essential in the devices of the prior art (in which the principle was to guide the piece of material before 'it does not pass under the presser foot), we obtain with the invention a guide on all the material entering the presser foot with greater efficiency and greater precision at the presser foot. Furthermore, according to the invention, it is the position of the portion of the reference line which passes to the right of the detection zone, which is used to determine whether the adjustment member is placed in one or the other of the states. In addition, when this portion of the reference line passes exactly over the detection zone and coincides with the detection line, one can choose to place and maintain the adjustment member in one or the other of the two states. We choose for example the directly driven state.
- the point of contact of the adjusting member is not placed on the drive line and the orientation of the adjusting member remains fixed, it appeared that with a simple piloting of the all-type or nothing carried out continuously and at high frequency, an adjustment and a guidance of high precision are obtained according to curves which can be of very strong curvature, even angular.
- the pivoting torque induced by the guide device is at least approximately proportional to the distance between the point of contact and the entry of the presser foot, which distance can be significant.
- the braked state it is the presser foot itself which generates the pivoting of the material around a center of rotation which passes through the point of contact, and at the state driven in the direct direction the pivoting is due to the difference in speed between the drive of the material at the point of contact by the adjustment member and the drive of the material at the presser foot; the non-zero fixed orientation angle ⁇ laterally stretches the material permanently between the contact point and the presser foot, which considerably increases the dynamic performance by avoiding any unwanted undesirable phenomenon (puckering, wave effects, etc. ).
- the adjusting member brakes the material at the point of contact for the latter to pivot.
- the adjustment member is blocked to stop it. in the braked state.
- a stop command is particularly simple and quick to implement.
- an all-or-nothing drive motor is controlled by applying to it either a drive signal in the forward direction or a brake signal, depending on whether or not the presence or absence of material is detected.
- the invention also relates to a material guiding device, with a view to implementing the method according to the invention.
- the invention thus relates to a device for guiding flexible textile material (fabric, knit, etc.) capable of being sewn, fitted to a sewing machine provided with a work-holding plate, and a presser foot for driving of the material in a longitudinal drive direction associated with at least one needle, in order to allow the execution of an automatic sewing of the material,
- this guide device comprising:
- At least one member for adjusting the transverse position of the material mounted so as to be able to come into contact with the material, and adapted so as to be able to locally modify the drive speed of the material when it is applied to the material,
- the adjustment member permanently in contact with the material at a contact point offset laterally by a straight line, known as the driving straight line passing through the presser foot and parallel to the longitudinal direction of drive, characterized in that the application means are adapted and the adjustment member is mounted so that: said contact point is located, in operation, at least substantially at the level of the presser foot,
- a plane perpendicular to the work-holding plate at the contact point and which contains the direction of the peripheral speed V1 of the adjustment member at the contact point forms with a plane perpendicular to the work-carrying plate at the point of contact and parallel to said drive line, a non-zero angle of fixed orientation.
- the orientation angle ⁇ is less than 90 °, in particular between 20 ° and 45 °.
- the expression "at least substantially at the level of the presser foot” means that the contact point is located in an area which is neither completely upstream nor completely downstream of the presser foot. In other words, a plane perpendicular to the work-holding plate and to the drive direction and which contains the point of contact, passes through the presser foot.
- the adjustment 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 drive line.
- 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 guiding device according to the invention is advantageously applicable for the execution of an automatic sewing of a piece of material along a predefined reference line, for example along one of its edges. It then includes:
- a detector of the transverse position of said predefined reference line in particular in the form of a material presence or absence detector, associated with means for generating a position signal, the value of which varies according to whether said predefined reference line is on one side or the other of a straight line, called detection line, passing through the detector and parallel to the drive line.
- the drive means are adapted to be able to drive the adjustment member in the direct direction at a peripheral speed V1 of the adjustment member at the contact point which is greater than the component V2 ", at the point contact and in the direction of said peripheral speed V1, of the speed of driving V2 of the material by the presser foot,
- the means for driving the adjustment member are adapted to place and maintain the adjustment member in one of the following states: a state, known as a forward driven state, where it is driven , at said peripheral speed VI, in the direct direction by the drive means; and a state, called braked state, where said peripheral speed V1 is lower or in the opposite direction to said component V2 "of the speed of driving V2 of the material by the presser foot,
- the drive means comprise a drive motor
- said control means comprise an electronic control circuit in all or nothing adapted to deliver to the motor, ie a drive signal in direct direction of the motor corresponding to the state driven in the direct direction of the adjusting member, that is a braking signal of the motor corresponding to the braked state of the adjusting member, according to the state of said position signal .
- the drive means comprise means for clutching / disengaging the adjustment member with respect to said motor movement.
- the device according to the invention comprises means for braking the adjustment member adapted to block the adjustment member in the braked state.
- the control means are adapted to be able to control the stopping of the adjustment member in the braked state.
- the guide device is characterized in that the drive means are adapted to also be able to drive the adjustment member in reverse retrograde direction in the direct direction.
- the device comprises means for prior adjustment of the angle of orientation, so as to allow an initial adjustment, in particular as a function of the nature and characteristics of the material, and of the shapes of the reference line.
- 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 guiding device is characterized in that the adjustment member is of the rotary type (wheel) and mounted freely in rotation about an axis and in that the drive means comprise a driving member capable of being coupled in rotation to the adjustment member at least in the directly driven state, and means for driving this driving member in direct rotation from a motor movement, at a speed of rotation corresponding to said peripheral speed of the adjustment member.
- the driving member is a roller mounted to rotate about an axis so as to be able to be placed in abutment against the adjustment member in order to drive it in rotation by friction contact. This roller is for example coupled to said drive motor of the adjustment member controlled in all or nothing.
- the roller and the adjustment member are then advantageously adapted to have a sufficiently low rotational inertia so as not to cause the motor to rotate in the forward direction when a signal to stop or change direction is rotation, is applied to the motor.
- the roller is made of light alloy, in particular aluminum alloy, and has recesses to lighten it.
- the motor is driven by inertia during passages in the braked state which are carried out at high speed (of the order of ten times or more per second). This characteristic is more particularly useful in the case of a stepping motor.
- the guide device according to the invention is advantageously applicable for the execution of an automatic sewing of a piece of material along one of its edges constituting said predefined reference line. It is then characterized in that:
- the position detector is a presence or absence detector of material, associated with means for generating a position signal with two states representative of the presence or absence of material, the control means are adapted to control the drive means alternately from the directly driven state to the braked state or vice versa at each change of state of the position signal.
- the detector and the adjustment member are arranged so that the contact point and the detection line are located on either side of said drive line.
- the device comprises means for blowing the material upstream of the presser foot, arranged so as to be able to apply a current of air to the material of antagonistic effect during the drive. of the material induced by the adjustment member in the directly driven state. In this way, the folding of the material liable to disturb the operation of the detector is avoided.
- the invention also relates to a sewing machine, in particular an automatic industrial sewing machine, for example for assembling finishing pieces for neck, sleeves, leg, etc., characterized in that it comprises at least a guide device according to the invention.
- the invention also relates to a method, a guiding device and a machine comprising in combination all or part of the characteristics mentioned above or below.
- FIG. 1 is a partial schematic perspective view seen from a first angle of a guide device and of a machine according to the invention
- FIG. 2 is a partial schematic perspective view seen from a second angle of a guide device and of a machine according to the invention
- FIG. 3 is a partial schematic view in elevation of a guide device according to the invention in the operating position
- FIG. 4 is a schematic top view illustrating the position and orientation of an adjustment member of a guide device according to the invention, in operation
- FIG. 5 is a schematic top view similar to Figure 4, illustrating the execution of an automatic sewing along a concave edge of a piece of material
- - Figure 6 is a schematic view from above similar in FIG. 4, illustrating the execution of an automatic seam at a concave angle of a piece of material
- FIG. 7 is a schematic top view similar to FIG. 4, illustrating the execution of an automatic sewing along a convex edge of a piece of material
- FIG. 8 is a schematic top view similar to FIG. 4, illustrating the execution of an automatic seam at a convex angle of a piece of material
- FIGS. 1 to 8 are mounted on a sewing machine 2 of the left head type; conventionally, this machine comprises a frame 3, a work-holding plate 4, a foot presser 5 associated with a needle 6 with their conventional drive kinematics (feed mechanism with claws, etc.), means for distributing the threads, etc.
- the aim of the example is to sew an elastic ribbon of collar E at the edge of a piece P of knitting or other flexible textile material and the machine is provided with conventional means for feeding and guiding this elastic tape E towards the sewing area (not shown).
- the presser foot 5 is adapted to drive the piece of material in the longitudinal direction, along a driving straight line 18.
- the guide device is intended to guide the piece of material P which rests on the work-holding plate 4 so as to allow the production, without the help of an operator, of a seam parallel to the edge of the material which can be of strong curvature, even angular, convex or concave.
- This guide device 1 is carried by a pneumatic cylinder 7, the body of which is secured by means of a part 8 to the frame 3 of the machine and the movable rod of which is fixed at its end to a support bracket 9 of the device. guide.
- the jack 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 distant from the material and from the work-holding plate 4 of in particular to allow 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 jack 7 extends vertically to move the guide device, downwards, in contact with the material to be guided. It is nevertheless understood that the invention extends to other embodiments, including those where the work-holding plate 4 could comprise 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.
- the guiding device can be placed under the work-holding plate 4, or duplicated in order to achieve simultaneous guiding of two layers of material, one above, the other below the plate 4.
- L 'support bracket 9 carries an adjustment member 10 which is mounted and adapted to, in the working position of the guide device, be applied in contact with the material at a contact point 12.
- This contact point 12 is located at- above the work support plate or, more generally, on a straight line normal to the work support plate.
- the actuator 7 applies and permanently maintains the adjustment member 10 in contact with the material, that is to say throughout the duration of the sewing of the piece P.
- this adjustment member 10 is of the rotary type and mounted to rotate freely about a horizontal axis XX ′, that is to say more generally parallel to the work-holding plate 4.
- the axis XX ′ and the member 10 are carried by the support bracket 9.
- the adjustment member 10 advantageously consists of a wheel, for example a sphere of elastic material such as a hollow rubber ball, mounted (for example by bonding of a side cap of its surface) on a carrier shaft 11 which pivots 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 by its center.
- Such an adjustment member 10 comes into contact with the material along a contact point 12 belonging to a circular drive generator situated in a plane perpendicular to the work-holding plate 4 and to the axis XX 'of rotation.
- the support bracket 9 also carries a driving member 13 able to be associated with the adjustment member 10 with a view to driving it in rotation.
- This driving member 13 is advantageously a roller mounted to rotate about an axis ZZ 'horizontal parallel to the axis XX' so that it can be placed in abutment against the adjustment member 10 in order to drive it in rotation by friction contact.
- the roller 13 is carried by a drive shaft 14 of an electric motor 15, the assembly being itself carried by the support bracket 9.
- the motor 15 is an electric motor of the stepping type.
- the motor 15 When the motor 15 is supplied with electrical energy, it rotates the roller 13 which, itself, drives the sphere 10 in rotation about its axis XX 'by friction contact.
- the guiding device also comprises an optical detector 16 of the predefined reference line which the automatic sewing must follow.
- This detector 16 is of the conventional type, and comprises a block 16a emitter / light sensor and a reflective plate 16b carried by the work holding plate 4 immediately upstream of the presser foot 5.
- the light source of the emitter assembly / sensor 16a emits a light ray which is reflected by the plate 16b.
- the sensor of the transmitter / sensor assembly 16a delivers an electrical signal whose value depends on the light intensity reflected by the wafer 16b.
- the electrical signal is maximum, all the light being reflected towards the sensor. In the presence of material, the light is absorbed and is not reflected, and the electrical signal delivered by 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 wafer 16b or on the contrary does not cover it.
- the detector 16 makes it possible to detect the transverse position of the edge to be sewn of the piece of material, this edge constituting said predefined reference line.
- the position detector 16 is therefore a presence or absence detector of material, and the photoelectric sensor constitutes means for generating a position signal with two states representative of the presence and absence of material in look of the plate 16b.
- the presence or absence of material is detected in at least one detection zone 16b defined by the plate 16b, located immediately upstream and near the presser foot 5, on the planned path of the edge. to detect.
- the plate 16b is preferably arranged as close as possible to the inlet 21 of the presser foot 5.
- the optical detector 16 -and more particularly the plate 16b- is associated with means for adjusting its transverse position in order to allow the position of the seam to be adjusted relative to the edge of the material.
- the detector 16 makes it possible to detect whether a portion of the edge of the material which passes opposite the detection zone 16b is on one side or the other of a line, called the detection line 17, parallel to the right of drive 18 and which passes through the detection zone 16b.
- a detector of the transverse position of another predefined reference line for example a reflective line drawn on the piece of material.
- the detector 16 is mounted upstream of the presser foot 5 and is associated with means for generating (photoelectric cell) a position signal whose value varies according to 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 (that is to say by the reflecting 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 transverse position of 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 adjustment 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 the detector 16 is supplied to a control circuit 19 (FIG. 9) of the motor 15.
- the vector V2 represents the driving speed of the piece of material by the presser foot 5. At the contact point 12, this driving induces a driving speed represented by the vector V2 '.
- the motor 15 and the roller 13 form means for driving the adjustment member 10, and are adapted to be able to drive this adjustment member 10 in the direct direction for which the peripheral speed of this adjustment member 10 to contact point 12, represented by the velocity vector VI, has a component parallel to the drive line 18, represented by the vector VI ', which is oriented in the same direction as the direction of drive of the material by the foot presser 5, that is to say in the same direction as the speed vector V2 for driving the material by the presser foot 5 (FIGS. 5 and 6).
- These drive means 13, 15 are also adapted to drive the adjustment member 10 in the direct direction at a speed of rotation corresponding to a peripheral speed V1 of this adjustment member 10 whose value is greater than the component shown. by the vector V2 "of the drive speed V2, at the point of contact 12 and in the direction of said peripheral speed VI. More particularly, 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 pivoting torque according to the arrow F1 (FIG. 5).
- V1 ′ is greater than V2 ′ in the example shown in FIG. 5 where the contact point 12 is in line with the presser foot 5. More generally, it it suffices that the components V1 ', V2' at contact point 12 of the peripheral speed VI of the adjusting member 10 and of the drive speed V2 by the presser foot 5 along a line perpendicular to the line connecting the contact point 12 and the presser foot 5 , are such that V1 '>V2' (or V1> V2 ", V2" being the component of V2 'according to the direction of V1).
- the motor 15 and the roller 13 also form drive means which are adapted to place and maintain the adjustment member 10 either in the state driven in the direct direction at said peripheral speed V1, or in a state, called state braked, where the peripheral speed V1 is less than or in the opposite direction to said component V2 "of the speed of drive of the material by the presser foot 5.
- V1 is less than or in the opposite direction to said component V2 "of the speed of drive of the material by the presser foot 5.
- an electric motor 15 step by step it suffices, for example, to send a signal to the motor 15 commanding its drive at a lower speed, or even stopping or driving it at a speed in a retrograde direction, opposite to the direct direction (FIGS. 7 and 8). is of the all or nothing type and is suitable for controlling the drive means 13, 15 as a function of the value of the position signal coming from the detector 16:
- the position signal changes state very quickly, since the edge " of the material is always at least substantially perpendicular to the plate 16b.
- the sphere 10 is therefore stressed at high frequency at the directly driven state and the alternately braked state This frequency of state change can reach a high value, in particular greater than 10 Hertz.
- the adjustment member 10 is mounted so that the contact point 12 is laterally offset from the drive line 18, and so that, in operation, its peripheral speed VI at the contact point 12 retains a fixed orientation. More generally, the plane perpendicular to the work plate 4 which contains the direction of the peripheral speed V1 at the point of contact 12, forms with a plane perpendicular to the work plate 4 and parallel to the drive line 18, a non-zero fixed angle of orientation ⁇ (FIG. 4) of less than 90 °.
- This fixed angle ⁇ is also the angle which the axis XX 'forms with respect to the line 20 perpendicular to the drive line 18. According to the invention, this orientation angle ⁇ is not zero, so that the sphere 10 tends to extend laterally the piece of material in the directly driven state. According to the invention, 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 means for prior adjustment of the orientation angle ⁇ , that is to say that it is mounted so that it can be moved in rotation about a vertical axis relative to the machine frame.
- this angle of orientation ⁇ remains fixed and the part 8 is locked in position by any suitable means.
- these adjustment means may be provided between the support bracket 9 and the rod of the jack 7.
- the adjustment member 10 is mounted so that the contact point 12 is located, in operation, at least substantially in line with the presser foot 5.
- a plane perpendicular to the work-carrying plate 4 and to the drive right 18 and which contains the contact point 12 passes through the presser foot 5.
- the adjustment member 10 is mounted so that a plane perpendicular to the work-holding plate 4 which contains a straight line passing through the contact point 12 and through the inlet 21 of the presser foot 5 forms an angle ⁇ of the order of 90 ° with a plane perpendicular to the work-holding plate 4 which contains the drive line 18 ( Figure 4).
- the angle ⁇ is significantly less than 90 °, the effectiveness of the guiding device in the braked state is reduced, or even canceled. Indeed, the presser foot 5 tends very quickly to exert a traction incompatible with the braking of the material at the point of contact 12. Similarly, if the angle ⁇ is significantly greater than 90 °, and in particular from approximately 100 ° , the guide device is no longer effective in the directly driven state since the material accelerates downstream of the presser foot 5, at a point which does not allow the pivoting of the room.
- the guide device according to the invention is placed at least substantially in line with the inlet 21 of the presser foot 5 and reaches its maximum efficiency for this position. In this way, it is possible to produce both concave (FIGS. 5 and 6) and convex (FIGS. 7 and 8) seams with high efficiency and high precision of the guidance.
- the device according to the invention advantageously comprises means 28, 29, 30 for adjusting the position of the contact point 12 relative to the presser foot, and in particular means 28, 29, 30 for adjusting said angle ⁇ .
- the part 8 carrying the vertical cylinder 7 and the support bracket 9 can be mounted relative to the frame 3 of the machine by means of a horizontal slide system 29 integral with the part 8 and with rod threaded 28 fixed on this frame 3, the position of the part 8 along the rod 28 can be adjusted for example by nuts 30 (one on each side of the part 8 to block it).
- the slides 29 and the rod 28 extend parallel to the direction in which the material is driven by the presser foot 5, so that these means 28, 29, 30 make it possible to adjust the position of the contact point 12 parallel to this direction .
- the device according to the invention comprises means (not shown) for moving the support piece 8 upstream before the start of sewing and of the presser foot drive so that the adjustment member 10 comes into contact with the fabric .
- These means are also suitable for again moving the support piece 8 downstream, simultaneously with the start of sewing, with a speed slightly lower than the driving speed V2 by the presser foot until the adjustment member 10 returns to its normal position substantially in line with the presser foot.
- These movements can be obtained simply by means of 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 drive direction.
- the control circuit 19 includes an all-or-nothing electronic control circuit 22 which receives the position signal delivered by the detector 16, analyzes this signal to determine whether it corresponds to the presence or absence of material (by comparing the analog electrical signal received at a threshold), and produces a two-state signal corresponding respectively to the drive state in the forward direction and to the braked state of the adjustment member 10.
- this electronic control circuit 22 delivers either a drive signal in the forward direction of the motor 15 capable of placing the adjustment member 10 in the driven state in the forward direction, or a braking signal of the engine 15 capable of placing the adjustment member 10 in the braked state, according to the state of the position signal delivered by the detector 16.
- the signal delivered by the control circuit 22 is supplied to a control card 23 of the stepping motor 15.
- This control card 23 develops and supplies the motor 15 with an electrical supply (in the form of frequency pulses proportional to the desired speed of rotation) corresponding to the state determined by the control circuit 22, in which the control unit adjustment 10 should be placed.
- the control circuit 19 receives a signal representative of the value of the speed V2 of driving the material by the presser foot 5, and the control card 23 is adapted to deliver a signal of drive in the forward direction such that the value of the peripheral speed V1 of the adjusting member 10 is in constant relation with the drive speed V2.
- V1 '>V2' whatever the value of V2, which can possibly be adjustable and vary.
- this constant ratio is chosen so that VI 'is little greater than V2' (V1 little greater than V2 ").
- the drive signal in the forward direction corresponds to a drive of the motor 15 at maximum speed in the forward direction
- the braking signal corresponds to a stop signal for the engine 15.
- the drive means of the adjustment member 10 may comprise clutch / disengage means of the adjustment member 10 relative to a motor movement.
- the main motor of the sewing machine to drive the adjustment member 10 and provide a clutch / brake device in the transmission kinematics.
- an electrically controlled clutch / brake can be provided on the rotary shaft 14 carrying 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 it is also possible to drive the roller 13 at nominal constant speed and to move the adjustment member 10 relative to the driven roller, either in a position where it is engaged in contact with the roller 13, or in a position where it is moved away from the roller 13 and disengaged.
- the adjustment member 10 can also be applied in contact with a fixed part to brake it.
- the shaft 11 which carries the sphere 10 can be mounted at the end of the actuating rod of a horizontal cylinder carried by the support bracket 9.
- the circuit of control 19 is then adapted so as to be able to place the adjustment member 10 in a state, known as a retrograde direction state, where it is driven in a retrograde direction by the drive means 13, 15.
- the braked state of the adjustment member 10 includes in particular the following states:
- the roller 13 and the adjustment member 10 are adapted to have as low an inertia as possible, and in particular a sufficiently low rotational inertia so as not to inertially drive the motor 15 in direct rotation when a signal d stop or rotation in a retrograde direction, or more generally a signal for changing the direction of rotation, is applied to the motor 15. It is in fact necessary to prevent the motor 15, in particular in the case of a stepping motor, from loses its reference in rotation due to the inertia in rotation of the roller 13 and / or of the sphere 10.
- the roller 13 is made of light alloy, in particular of aluminum alloy and / or provided with lights and recesses to lighten it.
- the guide device also comprises means 26 for blowing the material upstream of the presser foot 5, arranged so as to be able to apply a current of air on the material of antagonistic effect to the entrainment of the material induced by the adjustment member 10 in the directly driven state.
- FIGS. 1 and 2 show a nozzle 26 for blowing compressed air which opens immediately upstream of the presser foot 5 and blows an air stream upstream and in a direction substantially parallel to that of speed VI (angle ⁇ relative to the drive direction) to spread the material before it enters the presser foot 5.
- This current of air tends to unwind the edge of the material, to press it onto the plate 4, and to extend the portion of the material upstream of the presser foot in the opposite direction to that in which the material is entrained.
- a blowing nozzle 31 is provided for opening out between the trees 11 , 14 carrying the roller 13 and the sphere 10, so as to extend the material immediately downstream of the contact point 12 in the direction of the peripheral speed V1 of drive by the sphere 10. This avoids jamming and wrinkling each time the sphere 10 is rotated in the direct direction.
- a lateral suction mouth 27 is disposed on the side of the inlet 21 of the presser foot, opposite to the adjustment member 10. This mouth 27 is located on the side of the plate. detection 16b, and allows to press the edge of the material on this plate 16b avoiding creases.
- a guide for example in the form of a stirrup 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 guiding of the edge of the facing material. of the plate 16b.
- the minimum radius of curvature that can be achieved automatically by the guiding device of the invention depends on the difference between the peripheral speed V1 of direct drive of the sphere 10 and of 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.
- the value of the speed V1 of the sphere 10 is not made to depend on that of the speed V2 of the drive.
- the device is provided with a second optical detector 24, similar to the detector 16, and which is located opposite the detection line 17 relative to the detection member. adjustment 10.
- this second detector 24 The function of this second detector 24 is to detect the presence of the edge of the piece of material P in the case of concave curves with an extremely pronounced or angular curvature. If this detector 24 is covered with material, it transmits a signal corresponding to a circuit for controlling the drive speed V2 of the presser foot 5, and this control circuit decreases or cancels the speed V2. Thus, if the peripheral speed V1 of direct drive does not suffice to rotate the piece of material P by a sufficient amplitude in the direction of the arrow F1 to uncover the plate 16b (FIG. 6), the edge of the piece of material will come to cover the second detector 24, which has the effect of controlling the stopping or the reduction of the speed V2 of driving by the presser foot 5. Consequently, the pivoting can be entirely effective until that this second detector 24 is again discovered. This is particularly advantageous for edges of concave parts with acute angles.
- the state driven in the direct direction notably includes not only a state driven in the direct direction according to a nominal speed V1 little higher than V2 "(or VI 1 little higher than V2 '), but also a state driven in direct direction at high speed at a speed V1 much higher than V2 ", for example of the order of double or triple V2".
- V1 little higher than V2
- V2 very low speed
- This is particularly advantageous in the case of edges of concave parts with obtuse angles.
- the value of the peripheral speed VI is not always the same, and can vary between various values. The same applies to the ratio between the value of the peripheral speed VI of the adjustment member 10 and that of the drive speed V2.
- FIG. 8 shows a third detector 25 which, when uncovered, transmits a signal to the speed control circuit V2 which stops or slows down the drive by the presser foot 5, so that the part material can be pivoted in the direction of arrow F2 by retrograde drive of the sphere 10 until its edge comes to cover this third detector 25 again.
- the radius of curvature of the convex curves that can be obtained automatically can be extremely small or even angular thanks in particular to such a detector 25.
- the radii of curvature that can be achieved are further reduced without modifying the drive speed of the foot presser 5.
- FIGS. 5 to 8 illustrate different examples of automatic stitching that can be produced on a machine according to the invention, as well as different operating states of the adjustment member 10.
- a seam is produced along a concave edge of strong curvature of the piece P by sewing the piece E which is for example a round neck neckline.
- the plate 16b is covered and the point I of intersection between the edge of the material and a straight line which passes through the detection zone 16b and which is perpendicular to the detection line, is on the side opposite to the point contact 12 relative to the detection line 17.
- the adjusting member 10 is then driven in the forward direction at the peripheral speed V1.
- the peripheral speed V1 of the adjustment member 10 has a component VI 'in the drive direction which is oriented downstream, that is to say in the same direction as the speed V2 of drive by the presser foot 5.
- the part P tends to pivot according to the arrow FI until the plate 16b is uncovered, after which the adjustment member 10 will be placed in the braked state, for example by stopping the motor 15.
- the seam is made along a concave angle (for example a V-neck).
- the plate 16b being covered, the adjustment member 10 is in the state driven in the direct direction at speed V1, which induces a pivoting according to the arrow F1.
- the second detector 24 can be replaced by several separate detectors, for example one detector for stopping the drive and another for resuming it.
- the invention makes it possible in particular to produce automatic seams at high speed with high sewing precision and with any radii of curvature, in particular very small. It is in particular applicable to the automatic fitting of neck pieces E and then allows the production of V-necks or necks with a small radius of curvature.
- the adjustment member disposed in line with the presser foot can be produced in the form of a circular wheel, an endless band, and come into contact with the material at several contact points, or even according to a surface contact zone (which is offset laterally and at least substantially in line with the presser foot).
- several adjustment members can be provided (for example one in the forward direction, one in the retrograde direction, or one on each side of the presser foot and of the drive line 18, etc.).
- the invention is applicable to a left head or right head sewing machine.
- the invention is also applicable with other embodiments of the drive means and of the control means of the adjustment member.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Sewing Machines And Sewing (AREA)
Abstract
Description
Claims
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 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0848768A1 true EP0848768A1 (fr) | 1998-06-24 |
EP0848768B1 EP0848768B1 (fr) | 2002-03-20 |
Family
ID=26232782
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97929357A Expired - Lifetime EP0848768B1 (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 |
Country Status (5)
Country | Link |
---|---|
US (1) | US5941187A (fr) |
EP (1) | EP0848768B1 (fr) |
JP (1) | JPH11510724A (fr) |
AU (1) | AU3348597A (fr) |
WO (1) | WO1997047797A1 (fr) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001092627A1 (fr) * | 2000-05-29 | 2001-12-06 | Schmale-Holding Gmbh & Co. | Dispositif d'alignement precis du bord d'une bande |
GB0125288D0 (en) * | 2001-10-20 | 2001-12-12 | Pro Fit Internat | Application of waistband to garments |
US6789592B2 (en) * | 2002-10-18 | 2004-09-14 | Gore Enterprise Holdings, Inc. | Apparatus and method for guiding the seam allowance in seam sealing |
JP4585897B2 (ja) * | 2005-03-23 | 2010-11-24 | 株式会社森本製作所 | カーブ縫いミシンのプーラー装置 |
US7726252B2 (en) * | 2007-02-02 | 2010-06-01 | Maples Industries, Inc | Systems and methods for edge measurement |
US8348251B2 (en) * | 2008-08-14 | 2013-01-08 | Paul Edward Gallo | Sewing clip |
JP2015070892A (ja) * | 2013-10-02 | 2015-04-16 | ブラザー工業株式会社 | ミシン、及びミシンの制御プログラム |
DE102015200720B4 (de) * | 2014-07-02 | 2021-05-20 | Adient Luxembourg Holding S.À R.L. | Zuführeinrichtung und Fertigungsvorrichtung zum Vernähen von Zuschnitten gleicher Kontur |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3598070A (en) * | 1970-03-25 | 1971-08-10 | Ivanhoe Research Corp | Drag-steering walking-needle machine |
FR2392909A1 (fr) * | 1977-06-03 | 1978-12-29 | Inst Textile De France | Installation de guidage automatique d'un article devant un point de travail |
US4455954A (en) * | 1982-12-14 | 1984-06-26 | Tultex Corp. | Lateral position adjuster for edge margin of longitudinally conveyed flexible material |
FR2585683B1 (fr) * | 1985-08-02 | 1987-11-27 | Bertin & Cie | Dispositif d'entrainement pour ensemble de guidage de feuilles de materiau souple destinees a former un assemblage tridimensionnel |
DE3665894D1 (en) * | 1985-08-02 | 1989-11-02 | Bertin & Cie | Guiding device for sewing three-dimensional soft work pieces upon sewing machines |
DE3712493A1 (de) * | 1986-04-30 | 1987-11-05 | Textima Veb K | Mikrorechnergesteuerte naehgutfuehrung von zuschnitteilen aus flexiblen flaechengebilden |
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 |
US4813364A (en) * | 1988-04-08 | 1989-03-21 | Boser Ronald J | Belt drive material feed control apparatus for sewing machines |
DE3904385A1 (de) * | 1989-02-14 | 1990-08-16 | Schips Ag | Vorrichtung zum seitlichen ausrichten einer stoffkante beim naehen |
FR2665191B1 (fr) * | 1990-07-27 | 1992-11-20 | Rouleau Patrick | Dispositif de guidage de tissu et procede de couture automatique. |
JPH0796091A (ja) * | 1993-09-30 | 1995-04-11 | Matsuka Shoten:Kk | 敷物周縁部の縫製装置 |
US5497720A (en) * | 1994-03-25 | 1996-03-12 | Tachi-S Co., Ltd. | Device for guiding a cover member to a sewing machine |
-
1997
- 1997-06-13 WO PCT/FR1997/001079 patent/WO1997047797A1/fr active IP Right Grant
- 1997-06-13 AU AU33485/97A patent/AU3348597A/en not_active Abandoned
- 1997-06-13 JP JP10501325A patent/JPH11510724A/ja not_active Ceased
- 1997-06-13 US US09/011,616 patent/US5941187A/en not_active Expired - Fee Related
- 1997-06-13 EP EP97929357A patent/EP0848768B1/fr not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO9747797A1 * |
Also Published As
Publication number | Publication date |
---|---|
AU3348597A (en) | 1998-01-07 |
WO1997047797A1 (fr) | 1997-12-18 |
US5941187A (en) | 1999-08-24 |
EP0848768B1 (fr) | 2002-03-20 |
JPH11510724A (ja) | 1999-09-21 |
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