JP5195468B2 - Automatic sewing machine - Google Patents

Description

  The present invention relates to an automatic sewing machine that automatically sews fabrics superimposed on each other, and more particularly to an automatic sewing machine that is particularly suitable for application to stitch two fabrics into a three-dimensional shape.

Conventionally, various products are manufactured by sewing. The skin of the armrest provided inside the door of the automobile is one of the sewing products.
FIG. 17 shows a specific example.
In the figure, 10 is an armrest, and 12 is a skin on the surface of the armrest 10.
The skin 12 is a separate body from the first piece 12A, which covers a part of the upper surface and the entire side surface of the armrest 10, and which forms the majority of the skin 12, and the first piece that extends thinly along the notch on the upper surface. And a second piece 12B, which are formed together, and are stitched together along the joining line P to be integrated.

In this example, both the first piece 12A and the second piece 12B are made of polyurethane, and the skin 12 has elasticity.
Note that the edge of the notch continuously moves downward from the upper surface and then reaches the end in the longitudinal direction.

The second piece 12B has a shape that intersects the first piece 12A at an angle of 90 ° or close to the first piece 12A along the upper end of the first piece 12A. Specifically, it is joined to the first piece 12A so as to have such a shape.
The first piece 12A and the second piece 12B have a bent shape at the right end in the figure in the state of the sewing product. 24 and 26 in the figure represent bent portions in the first piece 12A and the second piece 12B, respectively.

  However, in the first piece 12A, the bent portion 24 is not formed in such a bent shape in a single molding state, and the bent portion 24 is in an unfolded shape as shown in FIG. Are formed in the same direction as the main body portion.

The first piece 12A and the second piece 12B are joined together to form a three-dimensional shape as a whole by sewing, and FIG. 18 specifically shows the sewing method.
FIG. 18I shows the single shape of the first piece 12A and the second piece 12B (however, the second piece 12B is shown in an inverted shape).

  In addition, the lower side end of the second piece 12B in the width direction in the drawing has a concavo-convex shape having a plurality of convex portions 14 and concave portions 16 along the longitudinal direction, and the right end portion in the drawing has a concavo-convex shape. Has a protruding portion 18 that protrudes partially.

In order to sew the first piece 12A and the second piece 12B, as shown in FIG. 18 (II), the second piece 12B is turned over, and the surfaces of the first piece 12A and the second piece 12B are brought together. In this way, the left end portions in the figure are overlapped.
At this time, as shown in FIG. 19 (A), the side ends of the respective left end portions on the stitching side are brought into contact with the ruler 20 to align each other.

As shown in FIG. 18 (II), when the second piece 12B is turned upside down, the side end shapes of the first piece 12A and the second piece 12B on the stitching side are opposite to each other.
Therefore, in order to match the shape of the stitching side of the first piece 12A and the second piece 12B, the second piece 12B having a shape opposite to the first piece 12A is forcibly deformed, The side end shape is matched with the side end shape of the first piece 12A, and stitching is performed.

  At this time, the first piece 12A and the second piece 12B are aligned with the stitching side edges so that the stitching side of the second piece 12B and the stitching side of the first piece 12A do not shift in the longitudinal direction. V notches 30A and 30B are provided in a cutout shape.

  At the time of sewing, the corresponding V notch 30B of the second piece 12B is aligned with the V notch 30A of the first piece 12A so that the positions in the longitudinal direction are aligned, and the first piece 12A and the first piece 12A are The two pieces 12B are sewn along the longitudinal direction with a predetermined seam (for example, the seam is 9 mm).

  When forcing the shape of the second piece 12B to the shape of the first piece 12A in the suturing, the length of the side end on the stitching side of the second piece 12B and the side end on the opposite side in the width direction are set. Since the lengths are different from each other (the length of the side end on the stitching side is longer than the length of the side end on the opposite side in the width direction), if the second piece 12B is simply forcibly deformed, The stitching side of the piece 12B is compressed in the longitudinal direction, and the opposite side in the width direction is pulled in the longitudinal direction.

  In this case, as shown in FIGS. 19B and 19I, the stitching side generates wrinkles or deforms into a wavy shape due to the compression, and the position of the side edge on the stitching side is the first piece 12A. A positional shift occurs in the longitudinal direction with respect to the side end on the suture side.

In order to prevent this, as shown in FIGS. 19B and II, the second piece 12B is pulled in the longitudinal direction (tensioned), and the second piece 12B having elasticity is stretched. Is deformed to match the shape of the first piece 12A (the shape of the stitching side), and the V-notch 30B of the second piece 12B is aligned with the V-notch 30A of the first piece 12A. The stitching is performed while preventing the side end of the stitching side of 12B from being deformed into a corrugated shape.
The V notch 30B also has a function of slightly absorbing the compressive deformation at the side end on the stitching side.

  However, the adjustment of the tension and the amount of extension are not the same over the entire length in the longitudinal direction, and the degree of change must be naturally changed between a portion close to a straight line and a portion bent largely. Even so, the degree of change must be changed between the large and small bends.

Such an adjustment operation is a difficult operation and requires a fine adjustment.
Therefore, conventionally, there has been a problem that such a sewing operation must be performed manually by an operator, and can only be performed by a skilled operator.

  However, even a skilled worker is difficult to perform the above-described sewing operation that requires fine adjustment, and the first piece 12A and the second piece 12B are sewn together while the undulation deformation is generated. It may occur that the first piece 12A and the second piece 12B are sewn together with the position shifted in the longitudinal direction.

  Further, if the first piece 12A and the second piece 12B are sewn together while the position is shifted in the longitudinal direction, the end position of the stitch, that is, the first piece 12A, as shown in the enlarged view of FIG. 18 (III). The position of the right end in the drawing and the right end of the second piece 12B in the drawing may be shifted in the longitudinal direction, and either one may protrude from the other.

  In addition, such manual work by workers requires a lot of labor and time for sewing work, and it is difficult to improve productivity, and it takes a long time to train skilled workers, Furthermore, there arises a problem that the quality of the sewing product varies due to individual differences among workers.

  Variations among individual workers, sewing with the wrinkles and wavy deformation described above, sewing with the longitudinal position shifted, and displacement of the longitudinal end. In order to prevent this, it is desired to automate the above-described sewing, that is, to enable sewing with an automatic sewing machine.

Various automatic sewing machines have been proposed.
For example, in Patent Document 1 below, the upper fabric and the lower fabric are regulated by the regulating member in the thickness direction of the fabric, the upper fabric and the lower fabric are introduced into the sewing position by the sewing needle, and a stopper portion is provided. Further, there is disclosed a technique in which an upper fabric and a lower fabric are laterally fed in a direction perpendicular to the feed direction by a lateral feed means and positioned by a stopper portion to keep a sewing margin constant.

  When automating the sewing of the first piece 12A and the second piece 12B, the first piece 12A is used as the lower fabric, the second piece 12B is used as the upper fabric, and the upper fabric is pressed by the regulating member of Patent Document 1. In addition, it is conceivable that the upper fabric is tensioned and stretched along with the feeding by the feeding device and the sewing is automated, but when sewing the first piece 12A and the second piece 12B, the second piece 12B is When there is a part that needs to be pressed to generate elongation (for example, a curved part) and a part that does not want to generate elongation by the presser (for example, a straight line or a part that is close to this), However, there are a part that needs to be increased and a part that needs to be reduced. When the dough over consisting et thus pressing with a constant force, it is impossible to satisfactorily perform sewing.

Further, in Patent Document 2 below, a presser roller that is movable up and down by a cylinder is pressed against the fabric, and the fabric is pulled in an oblique direction with respect to the feed direction while the fabric is fed in the sewing direction. A sewing device is disclosed.
However, the one disclosed in Patent Document 2 does not change the pressing force in the middle of feeding the cloth, and therefore the object of the present invention cannot be achieved with this sewing apparatus.
Although the problem has been described above regarding the sewing of the armrest skin as an example of the sewn product, this is merely an example, and the same problem occurs when sewing various other sewn products.

JP 11-319359 A Japanese Utility Model Publication No. 5-70475

  The present invention is based on the circumstances as described above, and an automatic sewing machine that can automatically sew a fabric in a superposed state without causing wrinkles or wavy deformation and preventing misalignment in the stitching direction. It was made for the purpose of providing.

  Thus, according to the first aspect of the present invention, there is provided (a) a sewing needle for stitching the lower fabric and the upper fabric in a state where the upper fabric having elasticity is superimposed on the lower fabric, and (b) the sewing needle. A presser member that presses the upper and lower fabrics around the sewing position, (c) a feed device that feeds the upper and lower fabrics in the stitching direction, and (d) a control that controls the operation of the sewing needle, presser member, and feed device. And an automatic sewing machine that automatically sews the upper and lower fabrics under the control of the control unit, and is located on the rear side of the presser member in the feed direction of the feed device. There is provided a tension adjusting member that generates a tension in the feeding direction by generating a tension between the upper fabric and the pressing member by pressing the upper fabric fed forward in the apparatus downward, And the tension adjusting member is in the thickness direction of the upper fabric. And each other form a movable, characterized in that the upper, are without a pressing force against the upper fabric under the control of the control unit as feed the by the feeding device under the fabric shall be variable.

  According to a second aspect of the present invention, in the first aspect, a forward movement position of the tension adjusting member toward the upper fabric is predetermined for each first set number of stitches by the sewing needle, and the tension adjusting member The movement timing is controlled by the control unit for each first set number of stitches, and the extension is made variable according to the change in the forward movement position.

  A third aspect of the present invention is characterized in that, in any one of the first and second aspects, the forward movement position of the tension adjusting member is variable in three or more stages.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the feeding direction of the side end is in contact with the side end of each of the upper fabric and the lower fabric on the stitching side, A stopper portion for positioning in a right angle direction is provided.

  According to a fifth aspect of the present invention, in the fourth aspect of the present invention, as the stopper portion, the upper stopper portion and the lower stopper portion, which are in contact with the side end of the upper fabric and the side end of the lower fabric, respectively, are positioned in the perpendicular direction. The stopper part is provided separately, and the upper stopper part and the lower stopper part can be moved in the perpendicular direction independently of each other, and each movement amount is controlled by the control part. It is characterized by the above.

  According to a sixth aspect of the present invention, in any one of the fourth and fifth aspects, the tension adjusting member is opposite to a side end on the stitching side which is a contact side of the upper fabric with the upper stopper portion in the width direction. A position restricting portion for restricting the position by engaging with the side end is provided.

  According to a seventh aspect of the present invention, in the fourth aspect of the present invention, when the abutment portion is brought into contact with a side end of the upper fabric opposite to the side end on the stitching side, A side guide member for pressing and positioning the other side end of the upper fabric in a direction in which the side end on the stitching side of the upper fabric is brought into contact with the upper stopper portion is provided.

  According to an eighth aspect of the present invention, in the seventh aspect, the position of the abutment portion of the side guide member is variable in the perpendicular direction.

  According to a ninth aspect of the present invention, in the seventh aspect, the position of the contact portion of the side guide member is variable in the feeding direction.

  According to a tenth aspect of the present invention, in the eighth aspect, the perpendicular position of the contact portion of the side guide member is predetermined for each second set number of stitches by the sewing needle, and the corresponding contact portion is moved. The timing is controlled by the control unit for each second set number of stitches.

  According to an eleventh aspect, in the ninth aspect, the feed direction position of the contact portion of the side guide member is predetermined for each third set number of stitches by the sewing needle, and the corresponding contact portion is moved. The timing is controlled by the control unit for each third set number of stitches.

  According to a twelfth aspect of the present invention, in any one of the first to eleventh aspects, the feeding device includes an upper feeding portion that feeds the upper fabric and a lower feeding portion that feeds the lower fabric, and the feeding device Under the state in which the upper fabric is stretched, the apparatus makes the feed of the upper feed section faster than the feed of the lower feed section under the control of the control section, In the sewing position, the shift of the position in the feeding direction of the upper fabric with respect to the lower fabric is eliminated.

  According to a thirteenth aspect of the present invention, in any one of the first to twelfth aspects, the feeding device is configured to change a feeding speed of the entire upper fabric and the lower fabric.

  According to a fourteenth aspect of the present invention, in the fourth aspect, an air nozzle is provided for ejecting air in a direction in which the lower fabric is brought into contact with the stopper portion.

  A fifteenth aspect is characterized in that, in the fourth aspect, a support surface for the lower fabric is inclined downward toward the stopper portion.

Effects and effects of the invention

  As described above, according to the present invention, in the feeding direction by the feeding device, the upper fabric around the sewing position by the sewing needle is positioned behind the presser member that presses the lower fabric, and the upper fabric fed forward by the feeding device faces downward. The automatic sewing machine is provided with a tension adjusting member that generates tension in the upper fabric by pressing the upper fabric and generates elongation in the feeding direction, and the tension adjusting member is movable in the thickness direction of the upper fabric so that the upper and lower The pressing force on the upper fabric is made variable under the control of the control unit as the fabric is fed by the feeding device.

  In the automatic sewing machine of the present invention, the shape of the side edge on the suture side of the upper fabric having elasticity is partially different or the same as the shape of the side edge on the suture side of the lower fabric. When the tension adjusting member is pressed against the upper fabric, it is possible to cause the upper fabric to stretch in the feeding direction by the feeding device, or to release the pressure by releasing the press. The shape of the side edge of the upper fabric on the stitching side is changed to the shape of the side edge of the lower fabric on the stitching side, and the side edge of the upper fabric on the stitching side is deformed. It is possible to adjust accurately without causing wrinkles or undulating deformation, and in the parts that do not need to deform the upper fabric in particular, it is also possible to prevent elongation from occurring. Of the suture side The shape of the end, it is possible to shape according to the shape of the suture side of the side edge of the lower fabric.

Alternatively, by adjusting the amount of extension of the upper fabric according to the difference between the shape of the side end of the upper fabric on the stitching side and the shape of the side end of the lower fabric on the stitching side, It is possible to correctly match the shape of the side end of the side with the shape of the side end of the lower fabric on the stitching side.
This makes it possible to realize automatic sewing of a pair of fabrics having different shapes at the side edges on the stitching side by turning either the upper fabric or the lower fabric in the opposite direction. .

  As is clear from the above description, the variable pressing force of the tension member in the present invention is a concept including a case where the pressing force is zero, that is, a case where the pressing force is not pressed and a case where the pressing force is pressed. Similarly, making the elongation variable is a concept including the case where the elongation is zero, that is, the case where the elongation does not occur.

  In addition, a partition plate (intermediate plate) is provided between the upper fabric and the lower fabric at a location where the upper fabric is pressed by the tension adjusting member, and the pressing force of the tension adjusting member against the upper fabric is received by the partition plate. The lower fabric can be kept out of the pressing force.

  In the present invention, the advance movement position toward the upper fabric of the tension adjusting member is determined in advance for each first set number of stitches by the sewing needle, and the movement timing of the tension adjusting member is controlled by the control unit for each number of stitches. And the elongation can be made variable in accordance with the change in the forward movement position (claim 2).

  In this way, it is possible to adjust the elongation generated in the upper fabric for each of various products or even for the same type of product to an appropriate elongation according to the shape. It is possible to perform fine adjustment work such as generating or not generating elongation or increasing or decreasing the degree of elongation.

  In the present invention, the forward movement position of the tension adjusting member can be varied in three or more stages (including a position where the upper fabric is not pressed) (Claim 3).

  In the present invention, it is possible to provide a stopper portion that abuts on the side edges of the upper and lower fabrics on the stitching side and positions the side ends in a direction perpendicular to the feeding direction when feeding by the feeding device. (Claim 4).

  By providing such a stopper portion, the position of the side edge on the stitching side of the upper fabric and the lower fabric can be correctly defined, and thereby, it is constant from the side end on the stitching side in the direction perpendicular to the feeding direction. When the upper and lower fabrics are sewn at a position separated from each other, that is, with a predetermined seam, the seam can be set to a predetermined desired seam.

  In this case, as the stopper portion, an upper stopper portion and a lower stopper portion, which are in contact with the side edge on the stitching side of the upper fabric and the side end on the stitching side of the lower fabric, respectively, are positioned in a direction perpendicular to the feeding direction. Are provided separately, and the upper stopper portion and the lower stopper portion can be moved in the perpendicular direction independently of each other, and the amount of movement thereof is controlled by the control portion. (Claim 5).

  According to the fifth aspect, the side edges on the stitching side of the upper fabric and the lower fabric are bent at the time of contact with the upper stopper portion and the lower stopper portion, or the upper fabric and the lower fabric are the upper stopper. When a gap is partially generated in the longitudinal direction (stitching direction) at the contact portion with respect to the lower stopper portion, the degree of bending of the upper stopper portion and the lower stopper portion is different, Alternatively, when the above gaps are different, the movement of the upper and lower stoppers can be changed by controlling the movement of the upper and lower stoppers in the direction perpendicular to the feed direction. The sewing position of the upper fabric and the lower fabric with the sewing needle is set to an appropriate position, and an appropriate seam margin can be ensured over the entire length in the sewing direction between the side end on the sewing side.

  5. The position according to claim 4, wherein the tension adjusting member is engaged with a side end on the opposite side in the width direction to a side end on the opposite side in the width direction from the side end on the stitching side which is a contact side with the upper stopper portion of the upper fabric. A restricting portion can be provided (claim 6).

  If it does in this way, under the state which pressed the upper cloth downward with the tension adjustment member (it may be in the state where it does not press), the other side of the width direction of the upper cloth in the position regulation part By restricting the positions of the side edges of the upper fabric, it is possible to prevent the upper fabric from meandering during feeding by the feeding device.

  Next, according to a seventh aspect of the present invention, the abutment portion is brought into contact with the side end of the upper fabric opposite to the side on the stitching side, and the side end on the stitching side of the upper fabric is moved at the time of feeding by the feeding device. A side guide member for pressing and positioning the other side end on the opposite side in the direction of contact with the stopper portion is provided.

In the conventional automatic sewing machine, a member for horizontally feeding the cloth in a direction perpendicular to the feeding direction by the feeding device is generally provided, and the side edge on the stitching side of the cloth is brought into contact with the stopper portion and positioned by the transverse feeding. The bill is made constant.
For example, the above-mentioned Patent Document 1, Japanese Patent Laid-Open No. 4-132585, and Japanese Patent Laid-Open No. Hei 8-141258 and others have disclosed that the cloth is laterally fed by such a lateral feed member to make the seam allowance constant. .

  However, in these cases, the cloth is laterally fed by rotating the rotating member while pushing the cloth downward with the rotating member. In this case, the rotating member is partially pressed against the cloth, and tension is applied to the cloth. This will adversely affect the application of tension by the tension adjusting member of the present invention.

  However, in this seventh aspect, the side guide member simply pushes the side end of the upper fabric, specifically the side end opposite to the side end on the stitching side, toward the stopper portion, thereby positioning in the direction perpendicular to the feed direction. Therefore, in other words, since the seam allowance is made constant, the above-described disadvantage does not occur, and the member for making the seam allowance adversely affects the tension applied by the tension adjusting member. The problem can be avoided.

In this case, the side guide member can be configured such that the position of the abutting portion that abuts on the other side end of the upper fabric is variable in a direction perpendicular to the feeding direction.
By doing this, even when the shape of the opposite side edge of the upper fabric has a concavo-convex shape along the feed direction, by changing the position of the contact portion in the right angle direction, The abutting portion can be favorably moved to follow the shape of the side edge on the opposite side of the upper fabric, and position regulation with respect to the opposite side edge can be favorably performed.

On the other hand, in the side guide member, the position of the contact portion can be made variable in the feeding direction by the feeding device (claim 9).
For example, the second piece 12B shown in FIG. 18 is used as the upper fabric, and the side guide is provided at the left end in the drawing of the protruding portion 18 at the end, that is, the other side end opposite to the one side on the stitching side. When the abutting portion of the member is abutted and guided, if the abutting portion of the side guide member is fixed in the feed direction, the projecting portion 18 passes through the abutting portion of the side guide member instantly. Thus, after the protruding portion 18 has passed the contact portion of the side guide member, the side guide for the protruding portion 18 cannot be performed.

  However, if the abutting portion of the side guide member is made variable in the feeding direction according to the ninth aspect, the abutting portion is brought into contact with the upper fabric while keeping the abutting portion in contact with the opposite side end of the protruding portion 18. By moving the contact portion to the forward position, the contact portion is moved following the forward movement of the protruding portion 18, and the side guide can be maintained during that time.

  In Claim 8, the perpendicular position of the contact portion of the side guide member is predetermined for each second set number of stitches by the sewing needle, and the movement timing of the contact portion is set for each second set number of stitches. It is possible to control by the control unit (claim 10).

  By doing in this way, it is possible to move the position of the contact portion at an appropriate timing when the shape of the opposite side end of the upper fabric changes.

An eleventh aspect of the invention relates to the ninth aspect, in which the position in the feed direction of the contact portion of the side guide member is predetermined for each third set number of stitches by the sewing needle, and the movement timing of the contact portion is set for each third set number of stitches. These are controlled by the control unit.
By doing so, the contact portion of the side guide member can be moved forward in an appropriate and appropriate amount according to the position and shape of the protruding portion on the opposite side end of the upper fabric. The side guide for the convex shape or conversely the concave shape can be appropriately performed.

  In the present invention, the feeding device includes an upper feeding portion that feeds the upper fabric and a lower feeding portion that feeds the lower fabric, and the feeding device is in a state where the upper fabric is stretched. Under the control of the control unit, the feed of the upper feed unit can be faster than the feed of the lower feed unit, and the displacement in the feed direction relative to the lower fabric of the upper fabric can be eliminated at the sewing position by the sewing needle (Claim 12).

If the upper fabric remains stretched even at the sewing position by the sewing needle due to the pressing of the tension adjusting member, that is, if the upper fabric is sewn to the lower fabric by the sewing needle while being stretched, the upper fabric is distorted after sewing. The remaining upper fabric and lower fabric cannot be sewn well.
However, according to the twelfth aspect, such inconvenience can be prevented, and even when the upper fabric is once stretched, the upper fabric and the lower fabric can be connected without leaving any distortion in the upper fabric. It becomes possible to sew well.

In the present invention, it is also possible for the feeding device to change the feeding speed of the entire upper fabric and lower fabric (claim 13).
For example, it is possible to make the feed to the fabric different between when sewing a large bent portion and when sewing a shape portion close to a straight line, and by doing so, the fabric can be stitched efficiently. Is possible.

In the present invention, an air nozzle that ejects air in a direction in which the lower fabric is brought into contact with the stopper portion can be provided (claim 14).
By doing in this way, the force of the direction which makes the side edge | side of a stitching | suture side contact | abut to a stopper part can also be exerted positively also about a lower fabric.

According to the fifteenth aspect, the support surface of the lower fabric can be a surface inclined downward toward the stopper portion.
By doing in this way, the side edge by the side of the sewing of the lower cloth can be made to contact the stopper part using the operation of the inclined surface.

It is a figure which shows the structure of the automatic sewing machine of one Embodiment of this invention. It is II-II sectional drawing of FIG. FIG. 3 is a sectional view taken along line III-III in FIG. 1. It is a figure which shows the structure of the tension adjustment apparatus of the embodiment. It is a figure which shows the structure of the side guide apparatus of the embodiment. It is a figure which shows the structure of the stopper apparatus of the embodiment. It is a figure which shows the structure of the feeder of the embodiment. It is a figure which shows the shape of the cloth | dough in the sewing process by the automatic sewing machine of the embodiment for every process. It is a figure explaining the process of sewing by the automatic sewing machine of the embodiment. It is a figure explaining the process following FIG. It is a figure explaining the process of following FIG. It is a figure explaining the process following FIG. It is a figure for demonstrating operation | movement of the tension adjustment apparatus of the embodiment. It is a figure for demonstrating operation | movement of the principal part of the automatic sewing machine of the embodiment. It is action | operation explanatory drawing of the lower stopper plate of the embodiment. 3 shows an example of control timing and control amount of the tension adjusting member of the embodiment. It is a perspective view of the armrest containing the sewn product of the skin. It is explanatory drawing of the sewing method of the outer skin of FIG. It is a figure explaining the problem of the sewing method of the conventional skin.

Next, an embodiment of the automatic sewing machine of the present invention will be described in detail below by taking as an example a case where the first piece 12A shown in FIG.
As shown in FIG. 18, the first piece 12A has a side end 32A on the stitching side that is substantially curved following the first portion 32A-1 having a shape that is almost a straight line on the left end side in the drawing. From the (curved) second portion 32A-2, the third portion 32A-3 having a shape that is almost linear following the second portion 32A-2, and a shape curved more than the third portion 32A-3 and the second portion 32A-2 The fourth portion 32A-4 has a small degree of curvature, and the fifth portion 32A-5 has a slightly larger degree of curvature on the right end side than the fourth portion 32A-4.

  On the other hand, in the second piece 12B, the side end 32B on the stitching side has a first part 32A-1, a second part 32A-2, a third part 32A-3, a fourth part 32A-4, and a fifth part of the first piece 12A. The first portion 32B-1, the second portion 32B-2, the third portion 32B-3, the fourth portion 32B-4, and the fifth portion 32B-5 each having a shape corresponding to the portion 32A-5 are provided. .

The fourth part 32B-4 of the second piece 12B has a shape that is greatly curved with respect to the corresponding fourth part 32A-4 of the first piece 12A, and is shaped like the fourth part 32A-4. Although it is different from the portion 32A-4, this is a shape in which the bent portion 24 is developed in the first piece 12A in a single molding state, whereas the second piece 12B is bent in advance in the shape at the time of single molding. This is based on the fact that the portion 26 is formed into a final bent shape.
That is, the bent portion 24 of the first piece 12A becomes the final bent shape only when it is stitched with the second piece 12B.
Note that a protruding portion 34 protruding rightward in FIG. 18I is provided on the left end side of the second piece 12B in the drawing.

In FIGS. 1 and 2, reference numeral 40 is a base for sewing work in an automatic sewing machine, 42 (see FIG. 2) is a sewing needle, 44 is a first piece 12A as a lower fabric around the sewing needle 42, and an upper fabric. It is a pressing member that presses the second piece 12B.
The pressing member 44 is L-shaped and has a pressing portion 46 at the lower end in the drawing.

48 is a feeding device that feeds the first piece 12A and the second piece 12B in the overlapping state in the stitching direction. The feeding device 48 includes a lower feeding portion 50 that feeds the first piece 12A as the lower fabric, and an upper fabric. And an upper feed portion 52 for feeding the second piece 12B.
Here, the lower feed portion 50 has a sawtooth-like feed dog 54 upward, and the upper feed portion 52 has a saw-tooth-like feed dog downward.

FIG. 7 shows a schematic configuration of the feeding device 48.
In this embodiment, the feeding device 48 has a function of differential feeding that makes the feeding speed by the upper feeding part 52 different from (accelerated) the feeding speed by the lower feeding part 50. The link 58 is connected to the upper feed portion 52 by a link that moves up and down.
In the feeding device 48, the link 58 moves up and down, so that the upper feeding unit 52 is moved up and down.

Reference numeral 60 denotes a drive unit that moves integrally with the lower feed unit 50 in the left-right direction (horizontal direction) in the figure. The upper feed unit 52 connects the horizontal link 62 and the vertical link 64 to the drive unit 60. Are connected through.
Here, the link 62 is connected to the links 58 and 64 through a shaft 65 so as to be relatively rotatable.

The link 64 is slidably engaged with the convex portion 68 of the drive unit 60 in the sliding groove 66 so as to be slidable in the vertical direction in the figure. Is added.
The link 64 can swing around the fulcrum 70 in the left-right direction in the figure.

A stepping motor 72 is connected to the rotary shaft 76 so that the disk 74 rotates integrally with the rotary shaft 76.
The disc 74 is connected to the link 64 at the outer peripheral portion via the shaft 65 so as to be relatively rotatable around the shaft 65.

In this feeding device 48, the lower feeding portion 50 operates so as to draw an ellipse as shown by an arrow in FIG. 2, and the first piece 12A as the lower fabric is intermittently fed forward to the left in the drawing.
The upper feed unit 52 also intermittently forwards the second piece 12B as the upper fabric while performing an elliptical motion as indicated by an arrow in FIG.

The above elliptical motion of the upper feed portion 52 is given as follows.
That is, the vertical movement of the upper feed portion 52 is given to the upper feed portion 52 by the vertical movement of the link 58, and the rocking motion is further caused by the rocking motion around the fulcrum 70 of the link 64 accompanying the rotation of the disk 74. By being transmitted to the upper feed unit 52 via the movement, a movement in the left-right direction in the figure is given to the upper feed unit 52.
The upper feed unit 52 is elliptically moved in the direction of the arrow shown in FIG. 2 by combining the vertical movement and the horizontal movement.

  In the upper feed portion 52, the link 64 is moved upward by the upward rotation of the disk 74 in the drawing, and the fulcrum 70 of the swing moves upward accordingly, whereby the feed speed to the lower feed portion 50 is increased. Is expedited.

  More specifically, when the fulcrum 70 moves upward, the distance L between the operating point of the driving force applied from the drive unit 60 to the link 64 and the fulcrum 70 of the swing is shortened, so The movement distance in the left-right direction is increased (the amount of feed for one time is increased), and the feed speed of the upper feed section 52 is increased accordingly.

1 and 2, reference numeral 78 denotes a partition plate that partitions the first piece 12A as the lower fabric and the second piece 12B as the upper fabric in the middle, and is provided in a fixed state.
A tension adjusting member 80 is provided above the partition plate 78 and at a rear position of the pressing member 44.
The tension adjusting member 80 is movable in the thickness direction of the second piece 12B, and presses the second piece 12B by a forward movement toward the second piece 12B, whereby the tension is applied to the second piece 12B. Tension is generated between the adjustment member 80 and the pressing member 44, and the second piece 12B is caused to generate elongation.

In this embodiment, the tension adjusting member 80 does not press the second piece 12B depending on the shape of the stitched portion, and does not generate tension (e.g., zero elongation), or presses the second piece 12B. Thus, tension is generated to cause elongation, or the amount of elongation is changed by changing the pressing force.
The movement of the tension adjusting member 80 is controlled by the control unit 82 in FIG.

FIG. 4 shows a schematic configuration of a tension adjusting device having the tension adjusting member 80.
In the figure, 84 represents the tension adjusting device.
As shown in the figure, this tension adjusting device 84 has a stepping motor 86 as its drive source, and its rotating shaft 88 is operatively connected to the tension adjusting member 80 via an arm 90 and a rod 92. It is connected.

In the tension adjusting device 84, the arm 90 is rotated in the vertical direction in the drawing by the rotation of the stepping motor 86, and thereby the tension adjusting member 80 is moved up and down in the vertical direction in the drawing.
The tension adjusting member 80 moves closer to the second piece 12B as the upper fabric by the lowering.
And according to the change of the approaching movement position (approaching movement end), the second piece 12B is not pressed or pressed, or the pressing amount is changed.

The control unit 82 controls the operation of the stepping motor 86 to change and control the pressing force applied by the tension adjusting member 80.
The tension adjusting member 80 is provided with a position restricting portion 94 that protrudes downward.
The position restricting portion 94 engages with the other side end opposite to the side end 32B on the stitching side of the second piece 12B, and restricts its position.

In FIG. 1, reference numeral 96 denotes a stopper portion that contacts the side edges 32A and 32B on the stitching side of the first piece 12A and the second piece 12B and is positioned in a direction perpendicular to the stitching direction. A lower stopper plate 98 that contacts and positions the side end 32A on the stitching side of the first piece 12A as the fabric, and an upper stopper plate that contacts and positions the side end 32B on the stitching side of the second piece 12B as the upper fabric. 100.
The lower stopper plate 98 and the upper stopper plate 100 can be moved independently in the vertical direction in FIG. 1, that is, in the direction perpendicular to the stitching direction, and the movement amount is controlled by the control unit 82. It is like that.

FIG. 6 shows a schematic configuration of the stopper device 102 having the stopper portion 96.
As shown in the figure, the stopper device 102 has a pair of drive units 104 and 106 for driving the lower stopper plate 98 and the upper stopper plate 100, respectively.

The drive unit 104 has a pair of guide rods 108 and a rack member 110 slidably fitted in the guide holes of the frame 107.
A rack gear 112 is provided on the rack member 110, and a pinion gear 116 provided on a stepping motor 114 as a drive source is engaged with the rack gear 112.

The lower stopper plate 98 is moved in the vertical direction in FIG. 6 according to the rotation amount of the stepping motor 114.
The other drive unit 106 is basically the same in configuration as the one drive unit 104, and only the reference numerals are shown, and a detailed description thereof is omitted.
Specifically, the upper stopper plate 100 is also moved in the vertical direction in FIG. 6 by the rotation of the stepping motor 114 by the drive unit 106.

  In FIG. 1, 118 is in contact with the side end 32B opposite to the side end 32B on the stitching side of the second piece 12B, and cooperates with the upper stopper plate 100 when the second piece 12B is fed. A side guide member that restricts the position of the second piece 12B in the direction perpendicular to the feeding direction and guides the second piece 12B. As shown in FIG. 5, a guide roller (contact portion) 122 is provided at the distal end of the L-shaped arm 120. Is provided downward.

  The side guide member 118 is movable in the vertical direction in FIG. 1, that is, in the direction perpendicular to the feeding direction by the feeding device 48 and in the feeding direction. The side guide device 124 of FIG. A drive unit 126 in the perpendicular direction and a drive unit 127 in the feed direction are provided.

  The drive unit 126 in the perpendicular direction has a pair of guide rods 128 slidably fitted in the guide holes of the frame 129, and a rack member 133 fixed to one guide rod 128 and moving integrally. In addition, a pinion gear 132 provided in a stepping motor 130 as a drive source is engaged with a rack gear 134 of the rack member 133.

  In the side guide device 124, the driving unit 127 in the feeding direction is moved together with the side guide member 118 in the vertical direction in FIG. 5, that is, in the direction perpendicular to the feeding direction by the rotation of the stepping motor 130.

  The drive unit 127 in the feed direction also has a guide rod 138 slidably fitted in the guide hole of the frame 136, and a rack member 140 fixedly provided on the guide rod 138, and is driven. A pinion gear 144 provided in a stepping motor 142 as a source is engaged with a rack gear 146 of the rack member 140.

  In the driving unit 127 in the feed direction, the stepping motor 142 is rotated, so that the guide rod 138 is moved in the left-right direction in the drawing based on the meshing between the pinion gear 144 and the rack gear 146, thereby the side guide member. 118 is moved forward and backward in the same direction.

In FIG. 1, an inclined plate 148 is provided on the base 40.
As shown in FIG. 3, the inclined plate 148 has an upper surface serving as a support surface for supporting the first piece 12A as the lower fabric, and the first piece 12A is inclined to the lower stopper plate 98 by the inclination of the support surface. The urging action based on gravity is exerted on the first piece 12A.
That is, the lower piece 12A is guided and biased so that the side end 32A on the stitching side of the first piece 12A is brought into contact with the lower stopper plate 98.

The inclined plate 148 is also provided with an air nozzle 150.
The air nozzle 150 injects air toward the first piece 12A and assists the movement toward the lower stopper plate 98 of the first piece 12A.
In FIG. 1, reference numeral 152 denotes a cover that covers the upper piece 12B from above.

Next, a procedure for sewing the first piece 12A and the second piece 12B by the automatic sewing machine of the present embodiment will be described below.
First, the first piece 12A is placed on the inclined plate 148 with the surface facing up, and air is ejected from the air nozzle 150 to place the first piece 12A on the lower stopper plate 98 side along the inclined surface of the upper surface of the inclined plate 148. And the first portion 32A-1 of the side end 32A on the stitching side of the first piece 12A is positioned against the lower stopper plate 98.
Further, the left end of the first piece 12A in FIGS. 18 and 8 is applied to a positioning member (not shown) to determine the position of the left end in the longitudinal direction in FIGS.

In addition, with the second piece 12B turned upside down, that is, with the back side facing up, the left end in the figure is overlaid on the first piece 12A, and the positioning member that is not shown in the drawing is further elongated. Determine the position by applying the direction end.
At this time, the second piece 12B is positioned in the direction perpendicular to the stitching direction by bringing the first portion 32B-1 of the side end 32B on the stitching side into contact with the upper stopper plate 100.
That is, as shown in FIG. 8I, the first portions 32A-1 and 32B-1 are aligned. FIG. 9 shows the state at this time.
At this time, as shown in FIG. 13A, the tension adjusting member 80 is retracted upward so that the position restricting portion 94 does not interfere with the protruding portion 34 of the second piece 12B.

In this state, as shown in FIG. 8 (II) and FIG. 10, the side end of the second piece 12B opposite to the side end 32B on the stitching side is the guide roller 122 of the side guide member 118. The first piece 12A and the second piece 12B are fed leftward in FIG. 10 by the feeding device 48 while the position is regulated by the side guide and the first needle 12 and the presser member 44 are moved up and down. The piece 12A and the second piece 12B are stitched together at a position that is a predetermined distance away from the side edges 32A and 32B on the stitching side in the direction perpendicular to the feed direction.
That is, the first portions 32A-1 and 32B-1 corresponding to the first piece 12A and the second piece 12B are sewn together with a predetermined stitch allowance (9 mm in this case).
Since the first portions 32A-1 and 32B-1 have a shape close to a straight line, as shown in FIG. 13A, the tension adjusting member 80 has the second piece 12B as the upper fabric. Does not press, and therefore does not cause elongation.

Next, the automatic sewing machine sews the second portions 32A-2 and 32B-2 following the first portions 32A-1 and 32B-1 (strictly, a position separated by a sewing allowance, the same applies hereinafter) ( FIG. 8 (II)).
Since these second portions 32A-2 and 32B-2 are largely curved, when the second portions 32A-2 and 32B-2 are stitched together, the tension adjusting member 80 is attached to the second piece 12B. The second piece 12B is pressed by the tension adjusting member 80 to generate tension.

Specifically, in a state where the second piece 12B is pressed by the tension adjusting member 80, the upper feed portion 52 advances the second piece 12B forward in the left direction in the drawing, thereby extending the second piece 12B. Give birth.
Then, by causing the elongation, in cooperation with the function of the side guide by the side guide member 118, the second portion 32B-2 of the second piece 12B is changed to the shape of the second portion 32A-2 of the first piece 12A. The shape is matched with deformation.

The second portions 32A-2 and 32B-2 are portions having the largest degree of curvature in the entire side edges 32A and 32B on the stitching side, and as shown in FIG. In addition, the pressure applied by the tension adjusting member 80 is maximized. That is, the amount of elongation of the second piece 12B is maximized.
The first piece 12A is forwardly fed leftward in the drawing by the lower feed unit 50 without causing tension and elongation.

  Therefore, if the feed speed (feed amount) of the first piece 12A by the lower feed portion 50 and the feed speed (feed amount) of the second piece 12B by the upper feed portion 52 are the same, the second piece 12B is stretched. In such a portion, the first piece 12A is displaced in the feeding direction.

Therefore, here, in order to eliminate the positional deviation, specifically, in order to eliminate the positional deviation at the sewing position by the sewing needle 42, the feeding speed (feed amount) by the upper feeding section 52 is set to be higher than the feeding speed by the lower feeding section 50. Also make it faster. That is, the feed amount is increased.
The pressing and feeding of the second piece 12B by the upper feed portion 52 and the pressing against the second piece 12B by the pressing member 44 are alternately performed.

FIG. 14 schematically shows a state in which the second piece 12B is stretched to cause a positional shift in the feed direction with respect to the first piece 12A, and the stretch is eliminated at the sewing position by the sewing needle 42. Represents.
In the state shown in FIG. 14I, the notch 30B of the second piece 12B is displaced to the rear side in the feed direction with respect to the corresponding V notch 30A of the first piece 12A (due to elongation). As shown in (II), when the feed speed by the upper feed portion 52 is fast, at the sewing position by the sewing needle 44, the V notch 30B of the second piece 12B is changed to the corresponding V notch 30A of the first piece 12A. The position is in the feed direction.

When the sewing of the second portions 32A-2 and 32B-2 is completed as described above, the sewing of the third portions 32A-3 and 32B-3 is subsequently performed (FIG. 8 (III)). .
The third portions 32A-3 and 32B-3 are portions having a shape close to a straight line. Therefore, at this time, the tension adjusting member 80 does not press the second piece 12B and causes the second piece 12B to stretch. Absent.
As shown in FIG. 11, the side guide member 118 continues to perform a side guide action on the side end of the second piece 12B opposite to the side end 32B on the stitching side in the width direction.

When the third portions 32A-3 and 32B-3 have been sewn, the fourth portions 32A-4 and 32B-4 are then sewn (see FIGS. 8 (IV) and 12).
The fourth portion 32A-4 of the first piece 12A has a shape that is close to a straight line, but the fourth portion 32B-4 of the second piece 12B has a curved shape, where the fourth portions 32A-4, When sewing 32B-4, the tension adjusting member 80 again presses the second piece 12B, thereby generating tension on the second piece 12B to cause elongation. Then, with the elongation and forced deformation of the second piece 12B, the sewing is performed by raising and lowering the sewing needle 42 while matching the shape of the fourth portion 32B-4 with the fourth portion 32A-4 of the first piece 12A. go.
In this case, as shown in FIG. 13C, the tension adjusting member 80 is controlled to have a smaller pressing force than when the second portions 32A-2 and 32B-2 are stitched. That is, the second piece 12B is controlled so as to have a small elongation.
Even when the fourth portions 32A-4 and 32B-4 are sewn, the side guide member 118 continues the side guide.

When the fourth portions 32A-4 and 32B-4 are stitched as described above, the fifth portions 32A-5 and 32B-5 are finally stitched (FIG. 8 (V)).
Since the fifth portions 32A-5 and 32B-5 have a substantially straight shape, the tension adjusting member 80 does not press the second piece 12B at this time, and only the side guide by the side guide member 118 is used. Then, these portions are stitched.
In addition, said protrusion part 18 exists in the position of 5th part 32B-5 of 2nd piece 12B.

  The side guide member 118, specifically the guide roller 122, abuts the side end opposite to the side end 32B of the second piece 12B through almost the entire process and performs side guide action. Has a concavo-convex shape with the convex portion 14 and the concave portion 16, and the guide roller 122 moves in a direction perpendicular to the feeding direction so as to conform to the concavo-convex shape, and is opposite to the side end 32B on the stitching side. Side guides work well at the side edges.

In addition, when the fifth portions 32A-5 and 32B-5 are stitched together, the guide roller 122 moves in a direction perpendicular to the feeding direction, so that the protruding portion 18 is brought into contact with the opposite side end. Keep side guide action.
However, if the guide roller 122 is movable only in the direction perpendicular to the feed direction, that is, only in the width direction of the second piece 12B and is fixed in the feed direction, the protrusion 18 passes the guide roller 122 instantaneously. Thereafter, the second piece 12B is not side-guided by the guide roller 122.

  Therefore, in this embodiment, as shown in the partially enlarged view of FIG. 12, after the guide roller 122 abuts on the side end of the protruding portion 18, the guide roller 122 moves forward in the feeding direction along with the feeding of the second piece 12B. That is, it moves forward following the movement of the protrusion 18, and continues the side guide action for the protrusion 18, that is, the side guide action for the second piece 12B.

  In this embodiment, the lower stopper plate 98 of the stopper portion 96 and the upper stopper plate 100 positioned on the upper side, which are located on the lower side with the partition plate 78 therebetween, independently move in the direction perpendicular to the feeding direction. Then, the side end 32A on the stitching side of the first piece 12A and the side end 32B on the stitching side of the second piece 12B are respectively defined in the direction perpendicular to the feed direction.

The first piece 12A as the lower fabric and the second piece 12B as the upper fabric are pressed toward the lower stopper plate 98 and the upper stopper plate 100, respectively, so that the side edges 32A and 32B on the stitching side are bent. Produce.
Thus, if the first piece 12A and the second piece 12B are forwardly fed and stitched with such a bend occurring, a constant seam margin cannot be secured.

  Therefore, in this embodiment, the lower stopper plate 98 and the upper stopper plate 100 move in the direction perpendicular to the feeding direction, so that the side end 32A on the sewing side of the first piece 12A and the side end on the sewing side of the second piece 12B. The contact position with respect to 32B is changed, and thereby, the seam allowance is kept constant.

The first piece 12A and the second piece 12B are not the same in the amount of bending, but are different from each other.
Therefore, in this embodiment, the lower stopper plate 98 and the upper stopper plate 100 can be moved independently, and the movement amount is controlled by the control unit 82. As a result, the first piece 12A and the second piece 12B can be sewn with appropriate seams.

The independent movement of the lower stopper plate 98 relative to the upper stopper plate 100 and its control also have the following meaning.
As shown in FIG. 15, the lower stopper plate 98 does not create a gap between the first piece 12A and the first piece 12A. When positioning and guiding the second portion 32A-2, a gap S is generated between the linear portion of the lower stopper plate 98 and the curved portion of the first piece 12A.

If such a gap S occurs, the side end 32A on the stitching side of the first piece 12A will not be positioned correctly, and as a result, the seam margin will differ from the preset seam margin.
In such a case, the lower stopper plate 98 is moved so that the actual seam allowance becomes the set seam allowance.

  In this embodiment, the forward movement position of the tension adjusting member 80 toward the second piece 12B is determined in advance for each set number of stitches (first set number of stitches) by the sewing needle 42. The movement timing is controlled by the control unit 82 for each number of stitches.

  Similarly, the movement of the side guide member 118 in the direction perpendicular to the set number of stitches (the first stitches) by the sewing needle 42 according to the shape of the side end opposite to the side end 32B on the stitching side of the second piece 12B. 2), the movement timing of the side guide member 118, that is, the guide roller 122, is controlled by the control unit 82 for each number of stitches.

  Further, also in the feed direction, the side guide member 118 is predetermined for each set number of stitches (third set number of stitches) by the sewing needle 42 according to the shape of the opposite side end of the second piece 12B. The movement timing of the guide roller 122 is controlled by the control unit 82 for each number of stitches.

  In addition, the movement timing of the lower stopper plate 98 and the upper stopper plate 100 is similarly controlled by the controller 82 for each set number of stitches by the sewing needle 42, and the movement amount is controlled.

FIG. 16 shows the control timing and control amount of the tension adjusting member 80 as a representative.
In the table shown in FIG. 16, the tension adjusting member 80 is held at the position represented by the index 405 in the step (I) of FIG. 8, and the number of stitches by the sewing needle 42 becomes 25. The adjusting member 80 moves toward the second piece 12B by the amount represented by the index 168, and when the number of stitches becomes 47 from the beginning, the tension adjusting member 80 is now turned upward by the amount represented by the index 85. When the number of stitches reaches 123 after that, the tension adjusting member 80 again moves downward by an amount represented by the index 68, and when the number of stitches reaches 146, the tension adjusting member 80 Represents the backward movement again by the amount represented by the index 100.

The number of stitches up to 25 corresponds to step (I) in FIG. 8, and the number of stitches up to 25 to 47 corresponds to step (II) in FIG.
Further, the number of stitches 47 to 123 corresponds to step (III) in FIG. 8, and the number of stitches 123 to 146 corresponds to step (IV) in FIG. The number of stitches after 146 corresponds to step (V) in FIG.

In this embodiment, the feed speed of the lower feed section 50 in the feed device 48 with respect to the first piece 12A is variable. That is, the feed speed for the entire first piece 12A and the second piece 12B is variable.
As a result, for example, it is possible to speed up feeding at a portion close to a straight shape, and slow down the feeding speed at a curved portion, so that stitching can be performed with high efficiency while keeping the stitching accuracy high. The time required for the process can be shortened.

  As described above, according to the present embodiment, the second piece 12B is stretched by the pressing of the tension adjusting member 80 against the second piece 12B, or the elongation is changed or the amount of stretch is changed. Thus, while deforming the second piece 12B, the shape of the side end 32B on the suture side of the second piece 12B is changed to the shape of the side end 32A on the suture side of the first piece 12A, and the side on the suture side of the second piece 12B. It can be accurately aligned without causing wrinkles or wavy deformation at the end 32B, and with the second piece 12B superimposed on the first piece 12A in the reverse direction, they are good Thus, automatic sewing of the skin 12 of the armrest 10 can be realized.

  In this embodiment, the side guide member 118 also side-guides the side end 32B opposite to the stitching side end 32B of the second piece 12B by the guide roller 122, so that the seam margin is constant. Therefore, the member for making the seam allowance constant as in the conventional automatic sewing machine has an advantage that the problem of adversely affecting the tension applied by the tension adjusting member 80 does not occur.

  Although the embodiment of the present invention has been described in detail above, this is merely an example, and the present invention can be applied when sewing various other sewing products other than the above examples. The present invention can be configured in various modifications without departing from the scope of the invention.

12A 1st piece (under fabric)
12B 2nd piece (upper fabric)
32A, 32B side end 42 Sewing needle 44 Presser member 48 Feeder 50 Lower feed part 52 Upper feed part 80 Tension adjusting member 82 Control part 94 Position restricting part 96 Stopper part 98 Lower stopper plate (lower stopper part)
100 Upper stopper plate (upper stopper)
118 Side guide member 148 Inclined plate (support surface)
150 Air nozzle

Claims (15)

(B) a sewing needle for stitching the lower fabric and the upper fabric in a state where the upper fabric having elasticity is superimposed on the lower fabric, and (b) the upper and lower fabrics around the sewing position by the sewing needle. A presser member that presses down, (c) a feed device that feeds the upper and lower fabrics in the stitching direction, and (d) a control unit that controls the operation of the sewing needle, presser member, and feed device. An automatic sewing machine that automatically sews the upper and lower fabrics under the control of the upper fabric, the upper fabric being positioned behind the presser member in the feeding direction by the feeding device and fed forward by the feeding device. A tension adjusting member that generates tension in the feeding direction by generating tension between the upper fabric and the pressing member by pressing downward is provided,
The tension adjusting member is movable in the thickness direction of the upper fabric, and the pressing force on the upper fabric can be changed under the control of the control unit as the upper and lower fabrics are fed by the feeding device. An automatic sewing machine characterized by the fact that   2. The advance movement position of the tension adjusting member toward the upper fabric is determined in advance for each first set number of stitches by the sewing needle, and the movement timing of the tension adjusting member is the first timing. An automatic sewing machine that is controlled by the control unit for each set number of stitches, and that the extension is variable according to a change in the forward movement position.   3. The automatic sewing machine according to claim 1, wherein the forward movement position of the tension adjusting member is variable in a plurality of stages of three or more stages.   The stopper according to any one of claims 1 to 3, wherein the stopper is in contact with each stitching side end of the upper fabric and the lower fabric to position the side end in a direction perpendicular to the feeding direction when feeding by the feeding device. An automatic sewing machine characterized in that a part is provided.   5. The upper stopper portion and the lower stopper portion, which are in contact with the side end of the upper fabric and the side end of the lower fabric and perform positioning in the perpendicular direction, are provided separately as the stopper portion. The upper stopper portion and the lower stopper portion can be moved in the perpendicular direction independently of each other, and each movement amount is controlled by the control portion. Automatic sewing machine characterized by   6. The tension adjusting member according to claim 4, wherein the tension adjusting member is engaged with a side end on the opposite side in the width direction from the side end on the stitching side which is a contact side of the upper fabric with the upper stopper portion. An automatic sewing machine having a position restricting portion for restricting the position.   In Claim 4, A contact part is made to contact | abut to the side edge on the opposite side to the said sewing side side edge of the said upper fabric, and when the said fabric side of the said sewing side is fed at the time of the feed by the said feeder An automatic sewing machine comprising a side guide member for pressing and positioning the other side end of the opposite side in a direction in which the side end is brought into contact with the upper stopper portion.   8. The automatic sewing machine according to claim 7, wherein the position of the contact portion of the side guide member is variable in the perpendicular direction.   8. The automatic sewing machine according to claim 7, wherein the position of the contact portion of the side guide member is variable in the feed direction.   9. The position of the abutment portion of the side guide member according to claim 8, wherein the position in the perpendicular direction is predetermined for each second set number of stitches by the sewing needle, and the movement timing of the contact portion is determined by the second set stitch. An automatic sewing machine which is controlled by the control unit every number.   In Claim 9, the said feed direction position of the said contact part of the said side guide member is predetermined for every 3rd setting number of stitches by the said sewing needle, and the movement timing of an applicable contact part is this 3rd setting sewing. An automatic sewing machine which is controlled by the control unit every number. In any one of Claims 1-11, the said feeder has an upper feed part which sends the said upper fabric, and a lower feed part which sends the said lower fabric,
And the feed device is configured to feed the upper feed unit under the control of the control unit under the state where the upper fabric is stretched, and to feed the feed faster than the feed of the lower feed unit. An automatic sewing machine that eliminates a shift of the position of the upper fabric with respect to the lower fabric in the feeding direction at a sewing position by a sewing needle.   The automatic sewing machine according to any one of claims 1 to 12, wherein the feeding device is configured to change a feeding speed of the entire upper fabric and the lower fabric.   5. The automatic sewing machine according to claim 4, further comprising an air nozzle that ejects air in a direction in which the lower fabric is brought into contact with the stopper portion with respect to the lower fabric.   5. The automatic sewing machine according to claim 4, wherein a support surface for the lower fabric is inclined downward toward the stopper portion.

Images