FR2631981A1 - SEWING DEVICE FOR SEWING ONDULATED FABRIC - Google Patents

Abstract

This sewing device comprises a sewing machine body 4 provided with a table 3, to which is fixed a fixed plate 1 comprising, in its upper face, guide grooves 11, 12, 13, and a movable plate 2 capable of sliding on the fixed plate 2 and comprising clamps 20 for fixing a basic raw material which can be sewn, and three guide rollers rotatably mounted on the rear surface of the plate 2 and intended to slide in said grooves, the shapes of which correspond to a sinuous or wavy seam line to be formed. Application in particular to automatic industrial sewing devices.

Description

Sewing device for sewing corrugated fabric The present invention

  a sewing device arranged to sew according to a

curved or sinuous arrangement.

  In the past and in general, the sewing of a fabric to another fabric in a curved or curvy arrangement was not achieved, in practice, by automatic means, due to technical difficulties inherent in such complex sewing operation. In most cases, an operator must manually move separately cut basic fabrics to make a curved or sinuous stitch using a conventional sewing machine. That is why it was necessary to have great skill or experience to implement this sewing technique, which hindered the execution of extremely efficient and fast sewing operations, of the type necessary for

  follow the recent trend - automation driven.

  The author of this invention

  previously proposed to make a sewing device

  putting into effect the automation of a curved seam. According to this first invention, a fixed plate is fixed to the table of a sewing machine and a movable plate is mounted so as to slide on the fixed plate. The fixed plate comprises guide means which are arranged in projection, and an elongate groove, curved or sinuous, formed in this plate. On the other hand, the movable plate is provided with a peripheral edge, which has a shape adapted to a given curved seam line, along which a fabric or base material is sewn from the starting point to end point, with a curvature corresponding generally at a 90 degree angle. This movable plate has a curved guide opening, which has a shape similar to the previous seam line, and dependent guide means, which protrude from the underside of the movable plate. The sinuous elongate groove of the stationary plate has a configuration corresponding to a track, along which the movable plate is to move so as to allow the stitching of the fabric or base material, in a manner corresponding to such a curvature. The guide means of the fixed plate are slidably inserted in the curved guide opening of the movable plate, and the guide means of the movable plate are inserted so as to slide in the groove.

  elongated sinuous of the fixed plate.

  Therefore, the fabric fixed on the movable plate is sewn in a curved arrangement obtained from the combination of the curved guide opening of the movable plate and the sinuous elongated groove of the fixed plate, thanks to the fact that the aperture guide curve serves to guide the movable plate along this curvature corresponding generally at a 90 degree angle and that the elongate sinuous groove serves to cause the movable plate to move along the curved opening of guide. As a result, the fabric is sewn

  automatic according to a predetermined curve arrangement.

  But, the first invention, described above, was limited to a curved seam, and it was not possible, with this prior art, to perform a seam to obtain a seam line of generally sinusoidal shape or shape-like . This is because the two guide means, which are respectively associated with the fixed and movable plates, are moved in a mutual cooperation relation for the sole purpose of sewing the fabric with a curvature corresponding generally to an angle. 90 degrees. No effective automatic sewing device has yet been proposed for sewing

  automatic two seam-shaped seams.

  Therefore, an object of the present invention is to provide a new sewing device, which allows to automatically perform a seam in a sinuous configuration. '

  In order to achieve this objective, the present invention

  It comprises a fixed plate, fixed on the table of a sewing machine body, and a movable plate slidably mounted on the fixed plate, the movable plate being arranged in such a way that a fabric to be sewn is fixed on this plate by means of clamps, and that on the lower face of the movable plate, it is provided de-s first, second and third guide rollers, mounted

  rotating and spaced from each other. The fixed plate com-

  * carries, at its upper surface, first, second and third guide grooves, which respectively receive the first, second and third guide rollers, in a manner allowing the sliding displacements of the three guide rollers along the three guide grooves. Each configuration of the three guide grooves has a sinuous shape adapted to a correct trace, which must be shown, so as to allow movement of the movable plate along a desired sinuous line of seam. In addition, the guide grooves are arranged such that two of them each comprise an enlarged groove, while, moreover, one of them does not have such a configuration. Thus, an escape or clearance zone is established for one of the three guide gauges to be placed in an idle state or able to rotate freely, which makes it possible to obtain uniform displacements of two or more guide rollers. along the respective parts, very

  curved, their guide grooves.

  Therefore, when the sewing device is actuated to start the sewing operation, the fabric attached to the movable plate is sewn by this device and is caused to move in a sewing direction which, in turn, leads to the movable plate to move in a sinuous movement relative to the fixed plate, the three guide rollers of the first plate moving by sliding along the respective grooves of

guiding the second plate.

  Other goals, features and benefits

  close to the present invention will be apparent to those skilled in the art upon reading the

  detailed description, which will follow, forms of

  realized in accordance with the invention and taken

  with reference to the accompanying drawings.

  The present invention will now be described in more detail with reference to the preferred embodiments of the device, given by way of example only and with reference to the accompanying drawings, in which: FIG. 1A is a perspective view partially cut away from a raw base material which is to be sewn by means of a sewing device according to the present invention; FIG. 1B is a perspective view, partially broken away, of the basic raw material which has been sewn by means of the same sewing device; FIG. 2 represents a perspective view of the device according to the present invention; FIG. 3 represents a sectional view taken

  along the line III-III in Figure 2.

  - Figure 4 shows a plan view of the movable plate according to the present invention; - Figure 5 shows a sectional view taken along the line V-V in Figure 4; - Figure 6 shows a plan view of the fixed plate according to the present invention; - Figure 7 shows a sectional view taken along the line VII-VII in Figure 6; Fig. 8 shows a plan view of a first raw stock material, showing its initial position for the sewing operation;

  FIG. 9 represents a schematic view of

  trating. displacements of the movable plate during the sewing operation;

  FIGS. 10 (1) to 10 (8) are schematic views

  ticks roughly representing a series of displacements of the movable plate as well as a series of sewing operations; FIG. 11 is a very diagrammatic view of the traces followed respectively by the first, second and third guide rollers of the movable plate; and

  12 (I) to 12 (IV) are illus-

  trant, explanatory manner, the displacement of the three guide rollers along their respective guide grooves as well as the associated displacements of the movable plate. Referring first to FIG. 1A, there is shown a three-layer basic raw material having a sinuous or corrugated cut edge al-1 having a concave-convex contour having a similar "shape" to a sine wave. This raw material of base al comprises a top layer of garlic coating, preferably made of a woven fabric (or a synthetic leather-tick), an intermediate buffer layer a12, preferably constituted by a urethane foam, and a layer of reinforcement a13 preferably made of a fabric

nonwoven.

  FIG. 1B shows the basic raw material having a seam appearing in the vicinity and the

2,631.91

  along the corrugated edge al-1. Indeed, in this figure, the edge al-1 is sewn with a thread that prevents everything

  fraying that may occur in this area.

  Referring now to FIG. 2, there is shown the sewing device A according to the present invention, which is arranged to sew the previous corrugated edge al-1 of the basic raw material al. A fixed plate 1 is fixed on a table 3 of the sewing device A, and there is provided a movable plate 2, on which the first raw material base, mentioned

  above, is fixed with two clamps 20.

  As shown in Figure 4, the movable plate 2 is superimposed on the fixed plate 1 and is defined by a side 2a of execution of the seam, which is close to the

  body of the sewing machine 4, by a pair of lateral sides

  2b, 2b 'and a free base side 2c, located at

  the opposite of the execution side 2a of the seam.

  A first guide groove 11, a second guide groove 12 and a third guide groove 13 are formed on the fixed plate 1 (see FIG. 6) and a first guide roller 21, a second guide roller 22 and a third roller 23 are rotatably mounted on the rear or bottom surface of the movable plate 2 (FIG. 4) so that the first, second and third guide rollers 21, 22, 23 are respectively inserted into the first, second and third guiding grooves 11, 12, 13, so as to be able to roll, as can be understood with reference to FIGS. 3, 5, 5, 6 and 7. A retaining presser member 4b of the sewing device A is adapted to retain, under the action of a pressure, the raw materials al so as to join them by sewing in the area

Sewing 4a.

  With reference to FIGS. 4 and 5, it can be seen that the movable plate 2 comprises a plate 25 forming a guide

  seam, provided on the side 2a execution of the seam.

  The guide plate 15 extends outwardly from the side 2a and has a concave-convex corrugated edge 25a, which is adapted to the shape of the corrugated edge al-1 of the raw base material 1a, and a thickened rim. device 26 formed along the two lateral sides 2b and 2b 'and the free base side 2c of the movable plate 2, a pair of clamps 20 located in opposite positions and provided on the respective lateral sides 2b, 2b', a zone recess 24, which is defined at the center of the movable plate 2 due to the presence of the thickened portion 26, which is raised on the periphery of the movable plate 2, and the first, second and third guide rollers 21,22 , 23 rotatably mounted on the rear surface of the movable plate 2, so that they extend downwardly from this plate. The concave-convex corrugated edge 25a is made of

  preferably stainless steel or similar material.

  As will be readily understood from FIG. 4, an arrangement of these guide rollers 21, 22, 23 is such that they are separated from each other so as to establish between them a positional relationship corresponding to a triangular arrangement. the first and second rollers 21, 22 being disposed adjacent the respective lateral sides 2b, 2b 'of the movable plate 2, and the second roller 23 being disposed adjacent the free base side 2c of

the movable plate 2.

  With reference to FIGS. 6 and 7, there is shown

  specifically the first, second and third

  previous guide elements 11, 12, 13, formed on the

  upper face of the fixed plate 1. These three grooves

  in accordance with the respective paths of

  cementing the first, second and third guide rollers 21,22,23, the arrangement of these tracks being determined so that the movable plate 2 performs a correct displacement (as can be seen in Figure 10) so as to position the corrugated edge al-1 of the raw base material al so that it is sewn into a predetermined sinuous corrugated configuration, having a shape similar to a "l / s", as will be explained later in more detail. Briefly, the first guide groove 11 is chamfered on the left side so as to have the shape of a dog tab, the third guide groove 13 is formed on the right side so as to have a configuration generally L-shaped, and the second guide groove 12 is formed with a generally curved shape between the first and third guide grooves 11,13, when looking at Figure 6. An enlarged groove of generally circular shape 12a is provided at one end of the second guide groove 12 and, similarly, an elongated enlarged groove 13a is provided at a

  end portion of the third guide groove 13.

  The two circular and elongate widened grooves 12a, 13a extend over a surface whose dimensions are greater than the external diameters of the second and

  respective third guide rollers 23 and 22.

  The circular enlarged groove 12 is arranged in such a way that the second guide roller 23 stays there or moves freely, in the case where (i) the first and third guide rollers 21, 22, which are naturally both inserted. in the respective first and third guide grooves 11, 13, cross tight elbow-shaped portions as shown at P and in FIG.

  P 'and defined respectively in the first and third

  11,13 or (ii) the first roller of

  guide 21 moves in a direction opposite to or different from

  ferent direction, wherein the third guide roller 23 moves. In this way, the second guide roller 22 does not interfere with the movements executed.

  together, first and third rollers 21,22.

2 63 198 1

  The elongated enlarged groove 13a is arranged so that the third guide roller 22 remains idle or freely moves in it at the initial stage, in which the movable plate 2 begins to move, namely when the first and second guide rollers 21 , 23 move at the initial curved ends S, S 'of the first and second guide grooves 11, 12. Therefore, the third guide roller 22 does not interfere with the initial movements, executed jointly, of the

  first and second guide rollers 21,23.

  FIG. 8 represents the state or the initial position of the movable plate 2. Therefore, from the position shown, the plate 2 begins to move, which makes it possible to sew the corrugated edge al-1 of the material basic gross al. Figure 9 shows schematically the continuous sequence of displacements of the movable plate 2 during the implementation of the sewing operation. In this figure,

  we see that the sliding movement of the first, second,

  and third guide rollers 21,22,23 along the respective guide grooves 11,12,12a, 13,13a causes the execution of a series of displacements of the movable plate 2. In this particular figure, the movable plate 2 is caused to move in the following sequence. First, it is located in the initial position marked 101, then passes through the subsequent positions 102,103, 104,105,106,107 in the direction of the arrow, to arrive at the final position 108. The reference numerals 11 ', 12', 13 'designate the traces which are followed respectively by the first, second and third guide rollers 21, 22, 23, during such series of

  displacements of the movable plate 2.

  Figures 10 (1) to 10 (8) show the posi-

  1, and the individual diagrams of the movable plate 2 from the initial position 101 to the end position 108, as shown in FIG. 9. Thus, the split diagrams 101, 102, 103, 104, 105, 106, and 107 associated with the movable plate 2, as shown in FIG. diagrams in the form of drawings 101 in Fig. 10 (1), 102 in Fig. 10 (2), 103 in Fig. 10 (3), 104 in Fig. 10 (4), 105 in Fig. 10 (5), 106 in Fig. 10 (6), 107 in Fig. (7) and 108 in Fig. 10 (8). From these figures, one can observe the position of the movable plate 2 relative to the needle 8 of the body 4 of the sewing machine and it is also possible to understand, by means of the line formed by dashes, what is the path according to which the winding edge

  al-1 raw material al is sewn by the needle 6.

  Referring to Figure 11, the traces of

  placement, which are followed respectively by the first, second and third guide rollers 21,22,23, mentioned above, during their movements along the guide grooves 11,12,13, which correspond to them, are represented by lines in solid lines. The reference numerals 11 ', 12' and 13 'respectively denote the first trace followed by the first guide roller 21, the second trace followed by the second guide roller 22 and the third trace followed by the third roller.

guidance 23.

  In this regard, a comparison of Figures 10 and 11.

  allows to understand the positional relationship existing between these three traces 11 ', 12', 13 'and the movable plate 20. In fact, the reference numerals 111, 121, 131 in FIG. 11, which represent the respective initial positions of the first, second and third guide rollers 21,22,23 in their respective tracks 11 ', 12', 13 'indicate the initial position of the movable plate 20 shown in FIG. 10 (1), the second following set of reference numerals 113,123,133 and the third set of reference numerals 115,125,135 in Fig. 11, which are naturally associated respectively to the three guide rollers 21,22,23, indicate the second position of the movable plate 20 in Fig. 10 (3) and the third position of the same plate 20 in Fig. 10 (5), and the last and fourth set of reference numerals 118,128,138, which represent the respective end positions of the three guide rollers -21,22,23, designate

  the terminal positions of the movable plate 20.

  FIGS. 12 (I) to 12 (IV) show the displacements of the movable plate 2 with respect to the fixed plate 1. FIG. 12 (I) represents the initial state, in which the movable plate 2 is situated at the point of starting, its first, second and third guide rollers 21,22,23 being located respectively at the initial ends of the first and second grooves 11,12 and the elongated groove 13a, formed in the fixed plate 2. This initial state corresponds in FIG. 10 (I) and reference numerals 111, 121, 131 in FIG. 11. Then, the second state in FIG. 12 (II) corresponds to FIG. 10 (3) and to reference numerals 113, 123, 133 in FIG. third state shown in Fig. 12 (3) corresponds to Fig. 10 (5) and reference numerals, 125,135 in Fig. 11, and the fourth state in Fig. 12 (IV) corresponds to Fig. 10 (8) and the numbers

reference 118,128,138.

  Thus, the comparative observation of FIGS. 9 to 11 and 12 (I) to 12 (IV) makes it possible to obtain a general understanding of the basic displacement of the movable plate 2 by

relative to the fixed plate 1.

  We will give below a description of the

  operation of the sewing device A described above.

  above. Firstly, the basic raw material is placed in the recessed area 24 of the movable plate 20, by fixing it on this plate by means of clamps 20.

2O 6 3 19

  ensure that the sewing margin of the raw material α1, marked in m in FIG. 4, projects a correct distance from the outer edge 25a of the guide plate 25 so as to be placed in a ready initial position for sewing, as shown

in Figure 8.

  Then, the connection of the sewing device A in order to start the sewing operation of the raw material leads the needle 8 to perform vertical movements back and forth and causes an advance action through the retaining presser member 4b and the advancing member (not shown). In turn, this causes the raw material ai towards the seam area 4a and simultaneously causes the moving plate 2 to move along the three preceding guide grooves 11, 12, 13, since the raw material al

  is firmly attached to the movable plate 2.

  As shown in Figs. 10 (1) and 10 (2), the corrugated edge α1 of the raw base material α1 is sewn while being guided by the corresponding corrugated edge 25a of

  the sewing guide plate 25 of the movable plate 2.

  Therefore the first, second and third guide rollers 21, 22, 23 are moved from their respective initial positions shown in Fig. 12 (I) and slide down along the respective guide grooves 11, 12 and the widened groove. elongated 13a. At this moment, it will be noted that the first and second guide rollers 21, 22 are in fact displaced along the respective first and second guide grooves 11, 12, while the third guide roller 23

  remains insane or moves freely within the realm of

  13a, which has the effect that the displacement of the movable plate 2 is effected in a uniform manner without any interruption caused by a discomfort opposed by the third guide roller 23 to joint movements

first and second rollers 21,22.

  When the sewing operation reaches the posi-

  located in the bottom of the recessed portion v in the two corrugated edges of the raw material al and the movable plate 2, as shown in Figure 10 (3), then the first, second and third guide rollers 21,22 , 23 located above the movable plate 2 are brought into the respective positions 113, 123, 133 in the first and second grooves 11, 12 and in the enlarged groove 13a, as can be understood by considering FIGS.

and 12 (II).

  Then, the seam reaches the point c located midway between the two corrugated edges of the base material al and the movable plate 2, as shown in FIG. 10 (5), in which case the first and second rollers of guidance 21,22 are released from their displacement relationship

  joint, since the second guide roller 22

  is in the widened groove of generally circular shape 12a, in which case it becomes crazy inside this groove. The third guide roller 23 then moves sliding along the third guide groove 13 to move together with the first guide roller 21, so as to orient the sewing operation towards the center h of the part convex corrugated edge al-l raw material al. At this stage, the first, second and third rollers 21, 22, 23 are therefore positioned in their respective positions 115, 125, 135,

  as can be seen in Figures 11 and 12 (3).

  From the midpoint c to the end point shown in Figure 10 (8), during the progression of

  the sewing operation, the movable plate 2 executes

  investments such as those represented in a very

  in Figures 10 (6) to 10 (8). The remaining half

  corrugated edge al-1 of the material is then sewn. Pen

26 1981

  in this part of the operation, the first and third guide rollers 21, 23 are moved along their guide grooves 11, 13, while the second roller 22 remains idle, which causes no discomfort with respect to the joint displacements of the first two rollers 21,23. When the sewing operation reaches the point

  as shown in Fig. 10 (8), the movable plate

  the 2 can not continue to move as the first and third guide rollers 21,23 reach their respective end positions 118,138, and the second guide roll 22 reaches the upper edge of the circular enlarged groove 12a, as is shown in Figures 11 and 12 (IV). So, the seam of the corrugated edge al-1

raw material is completed.

  The present invention is not limited to the embodiment shown, but, for example, the three guide rollers 21,22,23 and the three guide grooves 11,12,13, which have been mentioned previously, can be provided respectively on the fixed plate 1 and on the movable plate 2, contrary to the provisions

  provided in the embodiment described above.

  Likewise, a suitable cutting blade may be provided in the vicinity of the needle 8 of the sewing machine body 4, which makes it possible to simultaneously sew and cut a raw material of rectangular base so as to form a

  corrugated edge with a seam on its lateral side.

  From the previous description, we will note

  that the arrangement of the three guide rollers 21,22,23 and the three sinuous guide grooves 11,12,13 having two widened grooves 12a, 13a makes it possible to move the movable plate 2 so as to produce a sinuous and corrugated seam of the raw material al. In particular, the formation of the enlarged grooves 12a, 13a allows uniform joint displacements of two guide rollers among the three guide rollers 21, 22, 23, without one of them interfering with the others, which guarantees uniform and uninterrupted sewing operation. In addition, it is for this reason that the movable plate 2 is guided efficiently by at least two guide rollers, which move by sliding the

  along their own guide grooves, and consequently

  the movable plate 2 can not make a rattling sound or vibrate, which ensures stable movement and accurate sewing of the basic raw material along the

of a sinuous curve desired.

  Finally, the descriptions given previously

  made with reference to the embodiment shown, but it should be understood that the present invention is not limited to

  this embodiment and that it is possible, from the structural point of view, to make various other -changes, modifications and additions, without departing from the scope of the present invention. For example, the guide rollers 21, 22, 23 and the guide grooves 11, 12, 13 may be provided respectively in the fixed plate 1 and in the movable plate 2, in contrast to the embodiment described above, and the provisions these guide rollers and guide grooves may be modified in any other suitable manner so that the guide plate is properly displaced to create any type of guide.

  sinuous or wavy configuration of the seam line.

  The same is true for the corrugated edge 25a of the movable plate 2. Similarly, the raw material of base A1 is not limited to a material having an edge al-1 sinuous cut, but can be a. conventional rectangular material, in order to use the sewing device A as a means for executing a sinuous or corrugated seam

  deco-rative of such a common material.

  The foregoing description of the forms of

  specific statement fully indicates the general nature of

263198 1

  the invention, so that with usual knowledge, it is possible to easily modify such specific embodiments and / or adapt to different applications without departing from the scope of the invention, and therefore such adaptations and modifications are intended to be encompassed within the scope and range of embodiments equivalent to the described embodiments. It will be understood that the phraseology or terminology used here is only used in,

  a descriptive purpose and has no limiting character.

Claims (7)

  1. Sewing device in which a raw material base is sewn, characterized in that it comprises a sewing machine body (4) having a table (3),   a fixed plate (1) fixed on said table of said sewing machine body, said fixed plate having three guiding grooves (11, 12, 13) in its upper surface, and a movable plate (2) mounted so as to be able to sliding on said fixed plate (1) and comprising means in the form of clamps (20) for fixing said raw material base on the plate, and three guide rollers (21, 22, 23) rotatably mounted on a rear surface of said movable plate, these three guide rollers being adapted to slide respectively in said three guide grooves of said fixed plate, and that said three guide grooves (11, 12, 13) are each formed in accordance with the respective traces, which should be followed by said three guide rollers (21,22,23) so that said movable plate (2) moves on said fixed plate (1) to sew said raw base material in a sinuous or wavy configuration and in addition two (12, 13) of the three guide grooves (11, 12, 13) each comprise an enlarged groove (12a, 13a) whose surfaces have dimensions greater than the outside diameters of said guide rollers, so that at least two guide rollers move continuously sliding in their respective guide grooves, which allows to obtain a stable seam of said basic raw material, in which case, during operation of said body of the sewing machine (4), said raw stock material is sewn automatically according to a sinuous or corrugated. ? 631,981   2. Sewing device according to claim 1, characterized in that an edge (2a) of said movable plate (2) has a shape adapted to said sinuous or corrugated sewing mode, which must be implemented on said raw material of base, and that this base material is fixed on said movable plate (2) by means of said clip-shaped means (20), so that an end of said basic raw material overflows an edge of said plate mobile. 3. Sewing device according to claim 1, characterized in that said three guide rollers (21,22,23) are arranged on said movable plate (2) so that they are separated from each other and each of them 'them is located in the vicinity of the respective one of three   sides (2a, 2b, 2c) of said movable plate (2).   4. Sewing device according to claim 1, characterized in that said enlarged grooves (12a, 13a) are each defined in a region of said   respective guide grooves (11, 12, 13), making it difficult   a movement of said guide rollers along these grooves.   Sewing device according to claim 1, characterized in that said enlarged groove (12a, 13a) is defined in the two respective guide grooves (12, 13) so that one of said three guide rollers (21 , 22,23) remains idle or free to move in the groove when at least one of the other two rollers, which are part of said three guide rollers, moves along a tight elbow-shaped zone of the corresponding guide groove, which avoids discomfort   reciprocal of said three guide rollers.   Sewing device according to claim 1, characterized in that said enlarged groove (12a, 13a) is defined in the two respective guide grooves (12, 13) so that one of said three guide rollers 2 63 19 81   remains idle or free to move in this groove, when at least one of the two other rollers, which are part of said three guide rollers (21,22,23), moves in a -direction - opposite to or different a direction, wherein said first of said three guide rollers moves, thereby preventing mutual annoyance said three guide rollers.   7. Sewing device according to claim 2, characterized in that said raw material base is constituted by a top coating layer (garlic), an intermediate buffer layer (a12) and a reinforcing layer (a13), and comprises in Moreover, at the level of one of   ends, an edge with a sinuous cutout (al-   1), whose contour corresponds to that of said edge (2a) of said movable plate (2y.