JPS60129076A - Automatic stitching apparatus of cloth having long bent flange - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic sewing device for fabrics having relatively long curved edges, such as the side seams of pants, clothes, etc., and more specifically, the present invention relates to an automatic sewing device for sewing fabrics having relatively long curved edges, such as side seams of pants, clothes, etc. ,
During sewing, a path along the curved edge of the fabric to be sewn that is placed in the fixed state, that is, the length of the fabric to be sewn, is created using a mobile sewing machine that is movably supported in two axes (X and Y axes). The width direction (X-axis direction) and the front-rear direction (Y-axis direction) perpendicular to this length direction
The present invention relates to an automatic sewing device that performs sewing according to a curved edge formed on a fabric to be sewn while moving the sewing machine in the axial direction.

Conventionally, several devices have been proposed for automatically sewing long curved edges of a fabric to be sewn. One of them is, for example, the sewing device disclosed in Japanese Patent Application Laid-open No. 118548/1983 (hereinafter referred to as the conventional device), and the other is
This is a sewing device disclosed in Japanese Patent No.-21433 (hereinafter referred to as conventional device B).

Conventional device A has a feeding device made of a bendable band plate that presses and moves the fabric to be sewn onto a table, and uses a separately provided model plate to deform the band plate to match the kinship of the fabric. The curved edge of the fabric is held by the curved part of the band plate, and the fabric is moved to the curved edge by the combined movement of the linear movement of the band plate and the interlocking movement between the front and back while maintaining the curve of the band plate. It is designed to be sewn along the length. The disadvantage of the conventional device A configured in this way is that the structure of the feeding device including the strip plate is complicated, and the model plate with various types of curved surfaces that match the curved edges of the fabric to be sewn is prepared in advance. It is necessary to prepare. Furthermore, it is necessary to replace and set this model plate with a model plate corresponding to the curved edge of the fabric amount each time.

This &i again! 1 device cannot sew fabric unless the entire length of the belt feeding device passes through the front of the sewing machine, so the length of the sewing device is small (it requires at least twice the length of the fabric, and the length of the entire device is short). There were disadvantages such as increased size.

On the other hand, conventional device B was developed by the present applicant in order to eliminate the drawbacks of conventional device A described above.

In this device, a moving path is constituted by an endless flat belt having the same curve as the curve of a flexible guide band that is deformed by a plurality of pattern devices in accordance with the curve of the edge of the fabric to be sewn, and the endless flat belt is By moving the fabric to be sewn to the sewing position of the sewing machine, a curve matching the curve corresponding to the curve of the flexible guide band can be moved to the fabric by the displacement of the suppressing position of the fabric by the movement of the endless flat belt. A distortion is generated in the belt, the distortion is held by the endless flat belt, and the belt is linearly guided to the sewing position of the sewing machine for sewing. In other words, this sewing device uses the elastic properties of the fabric to form a sewing curve for one piece of fabric by distorting the fabric's grain, and while maintaining this distortion, guides the fabric linearly to the sewing position of the sewing machine to sew. This allows the fabric to be sewn in a free state in which the distortion of the fabric is eliminated and the edges are bent in a carelessly-shaped manner. The disadvantage of this conventional device B is that it cannot be applied to fabrics with curved edges with a small radius of curvature or fabrics with a small elastic modulus because it utilizes the elastic properties of fabrics, and it cannot be applied to fabrics with a small elastic modulus. There was some regret that it would be a special purpose aircraft.

In addition, a common drawback of these conventional devices A and H is that they both use fixed sewing machines placed in electrical positions, press the fabric onto a table with a band plate or an endless flat belt, and Since the machine is constructed so that the fabric is guided to the sewing position of the sewing machine by moving it on the table, there is a fatal drawback that the upper and lower fabrics to be sewn together become misaligned during this guidance.

An object of the present invention is to provide a device that eliminates all the drawbacks of the conventional devices mentioned above.In other words, in the device of the present invention, the fabric to be sewn is kept in a fixed state. (In order to achieve this, a stationary work table with a large number of small suction holes perforated on its upper surface is provided, and the work table is supported on the machine base directly below the work table so as to be able to reciprocate along the length of the work table.) A sewing machine base on which a sewing machine for sewing curved edges of the fabric to be sewn is mounted is provided on the carriage so as to be slidable in a direction perpendicular to the running direction of the carriage, and A flat belt is provided along the longitudinal direction of one side and stretched so that its upper surface is flush with the sewing table surface of the sewing machine, and the flat belt is connected to a plurality of belts carried on one side of the trolley. Both ends are fixed to both sides of the machine base through the guide rollers, and
The present invention is characterized in that the length of the belt portion, which is stretched flush with the sewing table surface of the sewing machine, is displaced as the cart moves.

Hereinafter, one embodiment of the device of the present invention will be described with reference to the accompanying drawings. In Figures M41 to 3, on the front frame lOa of the machine 10, there is a stationary work table 11 having a hollow structure with one side formed in a sharp shape as shown in the cross section of Figure 3. It is arranged over the entire length of 111JJ. As shown in FIG.
The area where the small hole 12 exists is the area that is covered by the selling fabric when the fabric F to be sewn is placed at a predetermined position on the work table. Further, a suction duct 13 connected to a suction device (not shown) via an appropriate switching valve is connected to the lower surface of the work table 11, and the suction force from the suction device is transferred to the suction duct 13 when the valve is opened. through the suction holes 12 of the work table 11. As a result, the fabric F placed on the work table 11 is suctioned and held in a fixed state on the work table 11 by the suction force acting on the small suction holes 12.

Directly below the work table 11 and approximately midway between the front and rear frames 10a and 10b of the machine stand 10, there are two slots 15.
16 is provided horizontally along the length of the machine base, and the trolley 17 can be moved back and forth along the rails 15 and 16. Further, a drive shaft 20 is rotatably mounted on one end of the rail 15.16 (left side in FIG. 2), and the drive shaft 20 is mounted on the rail 15.1.
A pair of wheels 21a, 22a are fixed on the outside of the rail 15.16, and this wheel 211 is attached to the other end of the rail 15.16! , a pair of wheels 21 corresponding to 22a
b, 22b are rotatably pivoted. And the wheel 21a on the rail 15 side.

A chain 23 is stretched between 21b and a chain 24 is stretched between wheels 221 and 22b on the rail 16 side, and attachments 23m and 24a are connected to both sides of the trolley 17. do. As shown in FIG. 3, a servo motor 25 is installed in one machine 10, and a wheel 26 is fixed to the rotating shaft of the motor 25.
A chain 28 is stretched between the wheel 27 and the wheel 27 fixed to the drive shaft 20. By driving the servo motor 25 in the forward and reverse directions and moving the chains 23 and 24 left and right through the drive shaft 2O, the platform! 17 to rail 15.
16, the work table 11 can be reciprocated along the length of the work table 11 (in the direction of the X-axis in FIG. 1). As is well known, the servo motor 25 is capable of precise speed switching control, and when the cart 17 is traveling outward, the cart can be run at the same speed as the sewing speed of the sewing machine, or the speed of the sewing machine can be set arbitrarily. The trolley 17 is controlled to run at a speed that corresponds to the change in the hand movement pitch, and on the other hand, to return the trolley 17 at a rapid forward speed during the return trip.

Two slide rails 31 and 32 are provided in parallel on the upper surface of the truck 17 in a direction perpendicular to the direction of travel of the truck, and the sewing machine base 30 is slidably arranged along the slide rails 31 and 32. do. An overlock sewing machine 3 is used to sew the curved edge Fa of the fabric F on the sewing machine base 30.
3, and the drive motor 34 of the sewing machine are installed. In the figure, 35 is the throat plate of the sewing machine, 36 is a sewing needle, and 37 is a sewing table that is flush with the throat plate 35, and the sewing table 37 is a part of the work table 11 formed into a sharp point as shown in FIG. It is placed at the bottom. The nut part 4 of the ball screw 41 is attached to the rear part of the sewing machine table 30 via a bra 40.
2 is installed. The ball screw 41 is rotatably supported by a bearing 44 provided on a plate-shaped bracket 43 erected on the rear side of the truck 17, and a gear 4 is attached to one end of the ball screw 41.
Fix 5. Further, a small servo motor 46 is attached to the plate-shaped bracket 43, and a gear 47 fixed to the rotating shaft of the motor 46 is meshed with the gear 45.

As a result, the ball screw 41 is driven forward and backward by the servo motor 46.
By rotating forward and backward and moving the nut part 42 back and forth along the ball screw, the sewing machine base 30 is moved integrally with the sewing machine 33 in a direction Ial (
It can be slid back and forth in the X-axis direction (see Figure 1). The forward and reverse drive control of the servo motor 46 is performed by two sensors S□ and S2 disposed on the head of the sewing machine 33 detecting the presence or absence of a curved edge of the fabric F to be sewn. , sensor S, causes the motor 46 to rotate forward, and sensor S! The sensor is driven in reverse by detecting this.

A roller bracket 50 is attached to the right side of the truck 17, and three idle rollers 51, 52, and 5 are arranged on the roller bracket 50 as shown in Fig.
3 are each rotatably supported. Then, between these guide rollers 51, 52 and 53, the flat belt 54, whose both ends are fixed to the left and right frame frames 10C and 10d of the machine base 10 with a step, is passed, and the flat belt 54 is passed as shown in FIG. As shown in FIG. 2, the wires are stretched along the length of the machine base 10 in an approximately inverted double-shape. That is, the belt portion 54a of the flat belt 54 stretched between the right side frame 10d of the machine stand 10 and the guide roller 51 is connected to the work table 11.
The guide roller 51 and the other guide rollers 5 are stretched horizontally along the length direction so that the upper surface thereof is flush with the upper surface of the sewing staple 37 of the sewing machine 33.
2.53 The belt portion 54b stretched between
The belt portion 54C stretched between the two carriages 17 is stretched horizontally so as to pass under one of the carts 17. The flat belt 54 stretched like the one above is a stand! 17, the lengths of the horizontally stretched belt portions 54a and 54C are displaced. That is, when the truck 17 travels to the right in FIG.
4C is that much longer. Further, when the platform 1t17 travels to the left, the belt portion 54a becomes longer and the belt portion 54C becomes shorter, contrary to the above case.

) portion 54a end of the flat belt 54,! = At the spatial position of the sewing table 37 of the sewing machine 33, there is a suction pipe 55 for shaping the curved edge Fa of the fabric F to be sewn by air suction force and then guiding it to the sewing position of the sewing machine.
is provided. This suction pipe 55 is attached to the sewing machine base 30 via a suitable bracket (not shown), and as shown in the figure, the suction hole at the tip thereof is formed into a flat shape, and is spaced vertically. information board 55
a, 55b. The lower guide plate 55a is connected to the belt portion 54a of the flat bevel 54 and the sewing tip 3.
7 and the upper guide plate 5.
5b has one end curved upward. By configuring the suction pipe 55 in this way, the curved edge Fa of the fabric F when the sewing machine 33 moves (sewing)
is smoothly and stably guided and supplied from the flat belt 54 onto the sewing table 37 of the sewing machine.

Next, the operation of the above-described embodiment will be explained.

First, as shown in Fig. m1, the fabric F to be sewn is placed at a predetermined position on the work table 11 so that its curved edge Fa rests on the belt portion 54a of the flat belt 54. All the drilled suction holes 12 are covered with the fabric.

After that, the first worker presses the first start button (not shown), the valve of the suction device opens, and the suction force from the suction device is transmitted to the small suction hole 12 on the work table 11 through the suction duct 13. The fabric F is suctioned and held in a fixed state on the work table. At this time, if there is something wrong with the mounting state of the fabric F, the second worker corrects that state. Next, the operator presses the second start button (
(not shown), the servo motor 25
starts normal rotation drive and causes the trolley 17 to travel to the right in FIGS. 1 and 2 (outbound travel). The servo motor 25 is driven and controlled so that the carriage 17 travels at the same speed as the preset sewing speed of the sewing machine 33. In addition, the rimming machine 33 is
The flat belt 54 also moves in the same direction (in the X-axis direction), and as the cart 170 travels, the length of the belt portion 54m of the flat belt 54 is gradually shortened.

Therefore, the curved edge Fa of the fabric F placed on the belt portion 54a is transferred from above the belt portion 54a through the lower guide plate 55a of the suction pipe 55 to the sewing table of the sewing machine 33 when the trolley 17 travels on the outward path. 37. A moderate suction force is acting on the suction pipe 55, and the curved edge Fa passing over the lower guide plate 55a is
For example, even if the fabric is curled, it is shaped by suction and fed onto the sewing table 37 in a stable state. In this embodiment, the curved edge Fa of the fabric is shaped by suction force.

Shaping may be performed using air jet force instead of suction force, or suction force and air jet force may be used together.

In any case, this should be determined depending on the type of fabric to be sewn.

In this way, as the sewing machine 33 moves as the trolley 17 travels in the outward direction, the curved edge F of the fabric F placed in a fixed state on the belt portion 54 of the warg table knob V11 and the flat JHL sheet 54 is moved.
When the fabric a is fed onto the sewing table 37 of the sewing machine, a detection device (not shown) detects the edge of the fabric and sends a detection signal to the sewing machine drive motor 34, thereby starting the sewing machine 33. Start. Since the sewing machine 33 continues to move to the right, the table 37 made by A
The curved edge Fa of the fabric F supplied above is sewn by the sewing needle 36 of the sewing machine.

By the way, the stitches on the curved edge Fa of the fabric F to be sewn by the sewing needle 36 of the sewing machine 33 must be sewn so as to follow the curved shape. For this purpose, in the embodiment of the device of the present invention, two sensors S and S2 are arranged at a position near the front of the sewing needle 36 at the head of the sewing machine 33 with a slight distance between them. Both sensors S/S2
detects the presence or absence of the curved edge Fa supplied onto the sewing table 37, transmits the detection signal to the drive circuit of the servo motor 46, drives the servo motor 46 in forward and reverse directions, and rotates the sewing machine 33 together with the sewing machine base 30. By moving the needle 36 back and forth in a direction perpendicular to the direction of movement (Y-axis direction), the sewing needle 36 of the sewing machine is moved to the curved edge F of the fabric F.
It is constructed so that sewing can be performed by moving the sewing machine along a curved path formed in the shape.

In other words, when the curved edge Fa of the fabric F has a curved shape (gently curved uneven shape) as shown in FIG. The sensor S is within the detection range of the curved edge Fa of the fabric F, and the sensor S2 is outside the detection range.

In this way, when the sensor S□ detects the curved edge Fa and the sensor S does not, that is, when the curved edge Fa is between the two sensors S1 and 52, the servo motor 46 is not driven. . When the sewing machine 33 further moves in the above state, the sensor S first reaches the convex edge of the curved edge Fa, and when the curved edge enters the detection range.

A detection signal is generated from the servo motor 46 to the drive circuit of the servo motor 46. As a result, the servo motor 46 starts reverse drive to move the sewing machine 33 backward away from the curved edge Fa, so that the sewing needle 36 of the sewing machine follows the convex edge of the curved edge Fa. It will be moved by When the curved edge Fa falls outside the detection range of the sensor S2, the reverse rotation of the servo motor 46 is stopped. Further, as the sewing machine 33 moves, when the sensor S□ reaches the concave edge of the curved edge Fa and the curved edge is out of its detection range, the servo motor 4 is activated by the detection signal from the sensor S8.
6 starts normal rotation drive. And this servo motor 46
When the sewing machine 33 is moved forward in the direction approaching the curved edge Fa, the sewing needle 36 is moved along the concave edge of the curved edge Fa. After that, the sensor S□ enters the detection range of the curved edge Fa, and the forward rotation of the servo motor 46 is stopped. In this way, the servo motor 46 is driven in forward and reverse directions based on the detection signals of the two sensors S□ and S2 that detect the presence or absence of the curved edge Fa of the fabric F, and the sewing machine 33 is moved by this forward and reverse drive. The curved edge Fa of the fabric is sewn using the diagonal needle 36 of the sewing machine while always setting the two needles on the sewing table 37 of the sewing machine. . Therefore, the above sewing needle 3
The curved edge Fa of the fabric F to be sewn by 6 is sewn along the curved shape.

In this way, when the curved edge Fa of the fabric F is sewn along the shape of the curve due to the combined movement of the rightward movement of the sewing machine 33 and the movement between the front and back, By the detection device passing the trailing edge of the cloth/%F,
The drive motor 34 of the sewing machine 33 is stopped. At the same time, the valve of the suction device is closed, and the suction and holding of the fabric F that had been continued until then is released, and the servo motor 25
Since the forward rotation of the sewing machine 33 is also stopped, the sewing machine 33, that is, the carriage 17 stops running at the right end of the machine base 10. After that, the servo motor 2 is activated via an appropriate timer.
5 is reversely driven to return the sewing machine 33 to the original position together with the carriage 17. When the truck 17 returns to running, the length of the belt portion 54a of the flat belt 54 is also increased in accordance with the traveling distance of the truck. Further, while the carriage 17 returns to running, the sewn fabric F is removed from the work table 11, and the next unsewn fabric is placed on the work table 11 at a predetermined position by the operator.

Thereafter, the fabric placed on the work table 11 by the operator's operation of the start button is automatically sewn according to the procedure described above.

As described above, when using the apparatus of the present invention, the fabric to be sewn once is placed on the work table in an identified state, and the sewing machine is moved between the length of the fabric and the direction perpendicular to the length.
Since the sewing machine is sewn while being moved along the curve formed on the curved edge of the fabric, unlike the conventional device described at the beginning, it is possible to sew in both directions. There will be no fabric misalignment between the upper and lower fabrics. Therefore, regardless of whether the fabric to be sewn is thick or thin, it can be easily sewn even if one surface of the fabric is easily slippery, and it can be applied to various ridge materials.

In addition, the device of the present invention has a flat belt stretched along the longitudinal direction of one side of the worktable so as to be flush with the sewing tape/V surface of the sewing machine and whose length is displaced when the sewing machine is moved. The curved edge of the fabric to be sewn is placed on the flat belt, and the curved edge is guided and fed onto the sewing table of the sewing machine via the guide plate of the suction pipe during sewing. Curved edges are 1! It is supplied in a stable state onto the sewing table and sewn smoothly.

Further, according to an embodiment of the present invention, the movement between the front and rear of the sewing machine is performed by the cooperation of two sensors and a servo motor, and the movement of the sewing needle of the sewing machine is controlled so as to follow the shape of the curved edge of the fabric. Since it is configured to sew while tightening, there is no need to adjust the curved shape of the strip or endless flat belt, which was required each time the curved shape of the fabric was changed, as in conventional machines. This makes it possible to shorten work time and reduce unit production costs accordingly.

[Brief explanation of the drawing]

1 is a plan view of the apparatus of the present invention, FIG. 2 is a front view of FIG. 1, and FIG. 3 is a view taken along the line II in FIG. 2. In these figures, 10... machine base, 11... work table, 12... small suction hole, 17... trolley, 3
0...Sewing machine base%33...Sewing machine, 37...
Sewing table-51, 52 and 53...Guide roller, 54...Flat belt, 55...Suction pipe-F
...Fabric f%, Fa...Curved edge = Ss +Sz・
··sensor.

Claims (1)

[Claims] In order to keep the aS fabric F in a fixed state, a stationary work table 11 with a large number of small suction holes 12 formed on its upper surface is provided. A dolly 17 supported so as to be able to reciprocate along the transverse direction is provided, and a sewing machine base 3° on which a sewing machine 33 for sewing the curved edge Fa of the fabric to be sewn is mounted on the dolly is perpendicular to the running direction of the dolly. A flat belt 54 is provided so as to be slidable in the direction of the sewing machine, and is stretched along the longitudinal direction of one side of the work table so that its upper surface is flush with the surface of the sewing table 37 of the sewing machine. The belt is fixed at both ends to both sides of the machine base through a plurality of guide rollers 51, 52 and 53 carried on one side of the trolley, and is attached to the M-made table surface of the sewing machine by the running of the trolley. Belt portion 54a stretched flush
1. An automatic sewing device for a fabric having a long curved edge, characterized in that the length of the fabric is configured to be displaced.