JPH09294885A - Automatic sewing device and sewing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a beautiful sewn shape and prevent an object to be sewn from being sewn in the shape of pleats. SOLUTION: A device comprises front and rear rollers 71, 82 which come into contact with, rotate, pull and extend an object to be sewn. The front roller 71 is disposed on the opposite side of the rotating direction (arrow b) as seen from a needle center B. Its position is displaced toward the outer edge from intended sewing position loci M1, M2 located before needle dropping points 99a, 99b. A tangential direction L4 on the intended sewing position locus of the object to be sewn (in this example, assumed as the locus of movement of the needle center B) at the needle drop point and a direction L5 of the front roller 71 surface form an acute angle. The back-and-forth direction of a free holder 95 or the direction of the sewing machine arm reference L3 is the direction of two needle sewing. The rear roller 81 is located on the machine arm reference L3 and on the side of moving direction (arrow b direction) due to ration of the object to be sewn as seen from the needle drop point B.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing device such as an automatic sewing device for performing shape sewing based on previously stored information on a sewing position.

[0002]

2. Description of the Related Art There is provided a means for holding and rotating an object to be sewn,
As a sewing apparatus for sewing the rotating workpiece, for example, there is a sewing apparatus disclosed in Japanese Patent Publication No. 6-67426.

The sewing machine disclosed in the above publication is an automatic sewing machine that superimposes a plurality of circularly cut sewing fabrics in a concentric shape and automatically sewes the outer peripheral edge portion thereof.

[0004]

In the above automatic sewing machine, the sewing object is circular and the sewing position is circular. Therefore, the circular sewing object is held and rotated at a constant angular velocity, and the rotating sewing object drops the needle at a constant needle driving speed at a predetermined fixed position, thereby making the sewing pitch constant. be able to.

However, the sewing position is not circular,
That is, when the distance from the center of rotation of the held sewn object to the sewing position is not constant, and therefore the automatic sewing is performed when the curvature of the sewing position is also not constant, in the above-mentioned conventional technique, the sewing pitch is kept constant. Can not do it. Note that FIG. 25 is a perspective view showing an example of a sewn object whose sewing position is not circular, and this sewn object has two sewing materials 202 and 20.
3 is an airbag 201 mounted on an automobile, in which 3 are overlapped with each other, and a seam allowance of an outer peripheral edge portion is circled once to perform double chain stitching with two needles.

Therefore, the applicant of the present invention, along with the coordinate information calculated based on the information about the sewing position including the information about the curvature, the relative position between the rotation center of the holding part and the needle drop position of the sewing part and the holding part. By sewing by adjusting the angular displacement of the needle and adjusting the needle drop position, even if the distance from the center of rotation of the work to the sewing position is not constant, automatic sewing can be performed at a uniform sewing pitch. A device has been proposed (Japanese Patent Application No. 7-321971 [unpublished at the time of this application]).

However, in the above sewing machine, the central portion of the sewn object is sandwiched and held, but the peripheral edge portion of the sewn area serving as a seam allowance is free. Therefore, when the relative position between the rotation center of the holding part and the needle drop position of the sewing machine approaches and the sewing machine part enters the peripheral part of the sewing machine, there is no "strain" on the outer peripheral part of the sewing machine and there is a clean sewing. There is a problem that the shape cannot be obtained. Further, there is a problem in that the upper sewing object to be sewn is pushed to the rotation center side of the holding section by the sewing machine section, and if it is sewn as it is, the sewing object is sewn in a pleat shape.

Therefore, an object of the present invention is to hold and rotate the central portion of the sewn object, and to rotate the center of rotation and the needle drop position of the sewing machine portion toward and away from each other, while the outer peripheral portion of the sewn object is sewn. In the automatic sewing machine that needles down along the line and sewn, by using a predetermined rotating body, a beautiful sewing shape can be obtained, and the sewn object will not be sewn in a pleat shape. Especially.

Another object of the present invention is to further ensure the cleanness of the sewing shape and the prevention of pleat-like sewing by adding another rotating body in the above automatic sewing machine.

Further, another object of the present invention is to improve the cleanness of the sewing shape in the above automatic sewing machine by using only the drive of the other rotary body or the drive of the other rotary body as the center. It is to further ensure the prevention of pleated sewing.

Another object of the present invention is to make it possible to maintain the predetermined rotating body in a desired direction at all times in the above automatic sewing machine, and further ensure the clean sewing shape and the prevention of pleated sewing. To do so.

Another object of the present invention is to allow the mounting position of the predetermined rotary body to be adjusted as desired in the above automatic sewing machine so that a desired arrangement state of the predetermined rotary body can be selected. To do.

Another object of the present invention is to further ensure the clean sewing shape and the prevention of pleated sewing in the above automatic sewing machine by providing a desired installation position of the predetermined rotating body. It is in.

Another object of the present invention is to further ensure the cleanness of the sewing shape and the prevention of pleated sewing in the above automatic sewing machine by providing the desired direction of rotation of the predetermined rotating body. is there.

Another object of the present invention is to ensure the cleanness of the sewing shape and the prevention of pleated sewing in the above automatic sewing machine even when the workpiece is continuously rotated. is there.

Another object of the present invention is to appropriately start and end the driving of the rotating body in the above automatic sewing machine, in order to prevent the sewing shape from being clean and the pleat-like sewing to be prevented by using a predetermined rotating body. By giving such timing,
It is to ensure the cleanness of the sewing shape and the prevention of pleated sewing.

Another object of the present invention is to prevent a thread after sewing from being damaged by a feed dog in a sewing device for sewing by dropping a needle along an outer peripheral portion of a rotating sewn object. It is to be able to maintain the strength of the sewing material.

To explain another problem, the present applicant makes the needle drop along the outer peripheral portion of the rotating sewn object and makes the interval between the sewing lines constant when performing double chain stitching with two needles. In order to tilt the sewing machine with respect to the tangent of the sewing line,
A sewing device has been proposed in which a line connecting two needles always passes through the center of rotation of a sewing object (Japanese Patent Application No. 7-7629).
No. 7 (unpublished at the time of this application)).

However, in the double chain stitch, the thread is entangled by the looper under the needle plate to form the sewing. When the thread immediately after the sewing is finished is pressed by the presser foot, the entanglement of the thread is adversely affected, There was a problem that the sewing tightness could not be improved.

Therefore, another object of the present invention is to drop the needle along the outer peripheral portion of the rotating sewing object and perform double chain stitching with two needles. The tangent direction of the sewing line and the sewing direction are the same. In a sewing machine that does not have a good sewing tightness.

[0021]

Means for solving the above-mentioned problems will be described by adding corresponding members and reference numerals in parentheses in the embodiments of the invention described later.

According to a first aspect of the present invention, a sewn object (20
1) Holding part (upper and lower presser 2
5, 26), a rotary drive unit (θ-axis motor 107) that rotates the holding unit about a predetermined rotation center (A), and a sewing machine unit (sewing machine device) that needles and sewes against the rotating workpiece. 3), and the position adjusting unit (R-axis motor 1 that moves the rotation center and the needle drop position (B) of the sewing machine unit closer to and away from each other.
08) and a storage unit (RAM 101) for storing information (sewing pattern data) on the sewing position with respect to the object to be sewn,
Based on this information, the rotation control unit and the position adjusting unit are driven to adjust the needle drop position and needle drop along the outer peripheral portion of the sewn object to sew.
100) is provided on the side opposite to the rotation direction (arrow b) of the sewn item when viewed from the needle drop position of the sewing machine part, and by contacting the outer peripheral portion of the sewn item at that position and rotating. ,
An automatic sewing machine including a first rotating body (front roller 71) for keeping a sewn object pressed at a needle drop position of the sewn object in cooperation with the holding section. It is (1).

In normal sewing, the work to be sewn below the presser foot can be smoothly passed because it enters from the curved front end part of the sewn presser upward, but along the curve of the end of the sewn product. In the case of sewing (see FIG. 23), since the cloth presser enters obliquely to the side of the presser foot, the cloth presser enters not from the upward curved portion but from the lateral flat portion of the presser foot. Such a sewn object is sandwiched and held by the holding portion on the side of the presser foot, but since the other end side is a free end, it stops at the side of the presser foot due to the presser foot pressure. The moving direction is changed so that it is along the side surface of the work clamp, and it cannot be smoothly passed.
Then, the workpieces transferred one after another from the diagonal direction are accumulated in a pleated shape between the side of the presser foot and the holding portion, and the gradually accumulated sewing objects press the side of the presser foot, and finally. Passes through the bottom of the presser foot in a pleated shape, and the sewn object gets wet in a pleated shape.

According to the automatic sewing machine of the first aspect, the first rotating body is provided on the side opposite to the rotating direction of the sewing object (the side from which the needle drops) as viewed from the needle drop position of the sewing machine. , By rotating this rotating body in contact with the outer peripheral portion of the sewn object at the position, the sewn object to be pressed at the needle drop position of the sewn object is pulled, and as a result, the cloth pressing is performed as described above. Even if the sewn object that is transferred diagonally from below hits the side of the presser foot, the transfer force can be smoothly sent to the lower part of the presser foot. With the cooperation of, the sewing target can be in a stretched state.

Therefore, according to the automatic sewing machine according to the first aspect, even if the sewing machine portion comes close to the center of rotation of the holding portion, a neat sewing shape can be obtained and the upper side to be sewn together can be sewn. The sewn object will not be pushed to the rotation center side of the holding portion and sewn as it is, and the sewn object will not be sewn in a pleated shape.

According to a second aspect of the present invention, the sewing machine is provided on the side of the sewing machine in the rotation direction (arrow b) as viewed from the needle drop position, and the outer peripheral portion of the sewing machine is contacted at that position. The second rotating body (which rotates by coming into contact with the workpiece and held in the needle drop position of the sewing article by the cooperation of the holding portion and the first rotating body). Rear roller 8
The automatic sewing machine according to claim 1, further comprising 1).

According to the automatic sewing machine of the second aspect, the second rotating body is provided in addition to the first rotating body. The second rotating body is provided on the sewing machine rotation direction side as seen from the needle drop position of the sewing machine, and comes into contact with the outer peripheral portion of the sewing machine at that position to rotate and pull the sewing machine, The sewn object to be pressed at the needle drop position of the sewn item is in a state of being extended by the cooperation of the holding portion and the first rotating body. That is, with respect to the needle drop position of the sewn object, the holding portion holds the central part of the sewn object, the first rotating body extends the sewn object, and the second rotating body extends the sewn object. Since the three-point support is provided, the deviation of the needle drop position is reliably prevented as compared with the case where only the first rotating body is provided (two-point support).

Therefore, according to the automatic sewing machine according to the second aspect of the present invention, by adding the second rotating body, the sewing shape can be made more beautiful, and the pleated sewing can be prevented more reliably. Done.

On the sewing position locus, it is better to stop or weaken the pulling of the sewn object by the first rotating body and use only the pulling by the second rotating body or the pulling center by the second rotating body.
It may be convenient to prevent the needle drop position of the sewing object from shifting.

Therefore, on the locus of the sewing position stored in the storage section, information indicating a section in which the first rotating body is brought into contact with the object to be sewn and a section in which it is released (front roller contact). Rotating body contact / release position storage section (RAM 101) for storing contact / release data) and a rotating body contact for contacting and releasing the first rotating body with respect to the sewn object based on this information. Contact / release adjustment unit (cylinder 77, solenoid valve 122,
123, CPU 100, etc.).
According to the automatic sewing machine (Claim 3), the second
At the position where it is convenient to pull only the sewn object by the rotating body, the contact between the first rotating body and the sewn object is released to further improve the sewing shape and prevent pleated sewing. Can be more certain.

Information relating to a specific section of the locus of the sewing position stored in the storage section and a desired pressing force on the object to be sewn by the contact of the first rotating body (front roller) Rotating body pressure fluctuation storage unit (R
AM 101), and a rotary body pressure adjusting section (cylinder 77, solenoid valves 118, 121, CPU 1 for adjusting the contact pressure of the first rotary body on the sewing object based on this information.
00 etc.), the automatic sewing device according to claim 2 or claim 3 (claim 4) is more convenient to use as the pulling center of the sewn object by the second rotating body. At the position, this can be realized by weakening the contact pressure of the first rotating body against the object to be sewn, the sewing shape can be further cleaned, and the pleated sewing can be prevented more reliably.

Further, a rotational speed variation memory for storing information (front roller speed data) which associates a specific section of the locus of the sewing position stored in the storage section with the rotational speed of the first rotational body. 5. A unit (RAM 101) and a rotating body speed adjusting unit (motor 72a, CPU 100) that adjusts the rotating speed of the first rotating body based on this information, according to any one of claims 2 to 4. According to the automatic sewing machine (Claim 5), the rotation number of the first rotating body is reduced at a position where it is more convenient to set the pulling center of the sewn object by the second rotating body. This makes it possible to further improve the sewing shape and prevent pleated sewing more reliably.

According to a sixth aspect of the present invention, a rotating body direction adjusting portion (motor 75, rack 74a, pinion 74b, variable angle fulcrum step screw 73b, etc.) for adjusting the direction of the contact surface of the first rotating body. , A certain needle drop position (n, n + 1, ...) To the sewn object and a next needle drop position (n + 1, n +).
2, ...) in the tangential direction (L4) of the sewing position locus, the next needle drop position (n + 1, n + 2, ...) After pulling out the needle from a certain needle drop position (n, n + 1, ...). A rotary body direction control unit (CPU 100) that adjusts the direction of the contact surface of the first rotary body by the rotary body direction adjusting unit until the needle tip comes into contact with the sewing machine. The angle between the tangential direction at the needle drop position (n, n + 1, ...) And the pulling direction (L5) of the sewn object by the first rotating body is maintained at a constant acute angle. 5
The automatic sewing device according to any one of items 1 to 5.

According to the automatic sewing machine of the sixth aspect, the angle formed by the tangential direction at each needle drop position on the sewn object and the pulling direction of the sewn object by the first rotating body is a constant acute angle. Therefore, the pulling state of the sewn object by the first rotating body can be uniformly maintained even at the position where the curvature changes in the sewing position locus.

Therefore, according to the automatic sewing machine according to the sixth aspect of the present invention, the pulling state of the first rotating body is always maintained at a desired constant state, whereby the sewing shape is further cleaned and the pleat-like sewing is performed. Can be more reliably prevented.

According to a seventh aspect of the present invention, a mounting position adjusting portion (position adjusting plate 734a, position adjusting plate 734b, screw 732b,) for adjusting the mounting position of the first rotating body is provided.
733b, 732a, 733a), and the contact position and rotation direction of the first rotating body with respect to the object to be sewn can be adjusted by adjusting the mounting position. It is a sewing machine.

According to the automatic sewing machine of the seventh aspect, it is possible to adjust the mounting position of the first rotating body to adjust the contact position and the rotating direction with respect to the sewing object to a desired state. .

According to an eighth aspect of the invention, the abutting position of the first rotating body is further out of the sewing target position from the sewing scheduled position locus (M1, M2) before the needle drop position of the sewing machine portion. The automatic sewing machine according to any one of claims 1 to 7, which is closer to the edge side.

According to the automatic sewing machine of the eighth aspect, the abutting position of the first rotating body is further closer to the outer edge side of the sewing object from the locus of the planned sewing position before the needle drop position of the sewing machine portion. . Since the central part of the sewn object is sandwiched by the holding parts, it is considered that the contact position of the first rotating body is further closer to the outer edge side of the sewn position from the scheduled sewing position locus before the needle drop position. It is preferable to prevent the displacement of the sewing object around the needle drop position.

Therefore, according to the automatic sewing machine according to the eighth aspect, by making the contact position of the first rotating body with respect to the object to be sewn to be an appropriate position, the sewing shape can be made more beautiful and the pleated shape can be obtained. It is also possible to more reliably prevent the sewing of.

According to a ninth aspect of the present invention, the tangential direction (L4) of the sewing position locus at the needle drop position of the sewn object and the pulling direction (L of the sewn object due to the rotation of the first rotating body).
5) forms an acute angle, whereby the first rotating body is sewn in the normal direction (L1) extended from the rotation center (A) of the holding portion to the needle drop position of the sewn object. The automatic sewing machine according to any one of claims 1 to 8, wherein the sewn object is pulled on the outer peripheral side and the tangential direction moving side (the arrow b side) of the sewn object.

If the work to be sewn on the outer peripheral portion is extended to the outer peripheral side of the sewn product in the direction of the normal line extended to the needle drop position of the sewn product,
Prevents misalignment of the sewn item and makes the sewing shape cleaner,
Pleated sewing is also prevented.

However, if the object to be sewn is pulled only in the direction in which the rotating body is brought into contact with the sewn object, it will be difficult in relation to the rotating direction of the cloth.

Therefore, according to the automatic sewing machine of the ninth aspect, the tangential direction of the sewing position locus at the needle drop position of the sewn item and the pulling direction of the sewn item by the rotation of the first rotating body are set. There is no difficulty because the work piece is made to have an acute angle and the work piece is pulled in the moving direction.

Therefore, according to the automatic sewing machine according to the ninth aspect, by providing the desired orientation of the first rotating body, it is possible to further ensure the cleanness of the sewing shape and the prevention of the pleated sewing. it can.

According to a tenth aspect of the present invention, the rotation driving section continuously rotates the holding section during sewing, and the first rotating body continuously rotates during sewing. The automatic sewing machine according to any one of claims 1 to 9.

When the first rotating body is rotated intermittently in accordance with the needle drop when the sewn object is continuously rotated, small wrinkles are accumulated on the sewn object and the cleanness of the sewing shape is impaired. In addition, pleated stitches are eventually formed.

Therefore, according to the automatic sewing machine of the tenth aspect, since the first rotating body also rotates continuously in accordance with the continuous rotation of the holding portion, it is small on the sewing object. Accumulation of wrinkles is prevented, the sewing shape is cleaned, and pleated sewing is prevented.

According to the eleventh aspect of the present invention, at least one of the first rotating body and the second rotating body is started to rotate before the needle drive of the sewing machine portion is started to extend the work. And a rotating body control unit (CPU 100) for starting and ending the rotation of at least one of the first rotating body and the second rotating body to end the extension of the sewing target after the completion of needle driving. The automatic sewing machine according to any one of claims 1 to 10.

According to the automatic sewing machine of the eleventh aspect, before the needle driving of the sewing machine is started, the extension of the sewing machine near the needle drop position is started by the first rotating body and the second rotating body. ,
Since the extension is terminated after the end of the needle drive, the needle drop position of the sewing target is in the extended state when the sewing starts and the first needle drop, and the needle drop position of the sewing target before sewing is completed. Since the stretched state is not released, give appropriate timing for starting and ending the drive of the rotating body to clean the sewing shape at the start and end of sewing, and pleated sewing may occur. To be prevented.

According to a twelfth aspect of the invention, there is provided a sewn object (20
1) Holds and rotates a holding part (upper and lower pressers 25, 2)
6), a sewing machine portion (sewing machine device 3) for needle sewing along the outer peripheral portion of the rotating sewing object, and a side portion of a needle drop position of a needle provided in the sewing machine portion. And a feed dog (98a), which feeds the sewn object only on the outer edge side of the sewn item from the needle drop position.

According to the sewn device of the twelfth aspect, the feed dog provided on the side of the needle drop position of the needle provided on the sewing machine portion is closer to the outer edge side of the workpiece than the needle drop position. Since only the sewn material is fed, and there is no feed by the feed dog on the side opposite to the needle drop position, that is, on the side where the needle drop trajectory with respect to the sewn item is curved, the thread after sewing may be damaged by the feed dog. There is no. Further, since the thread after sewing is not pulled by the feed dog, the strength of the sewn object can be maintained.

According to a thirteenth aspect of the present invention, there is provided a sewing object (2
01) A holding portion (upper and lower die pressers 25, 26) for holding, a rotation driving portion (θ-axis motor 107) for rotating the holding portion around a predetermined rotation center (A), and needle drop positions of the sewing target. Sewing direction (L3) and the tangential direction of the sewing position locus (L
And 4) are arranged so as to form a predetermined acute angle, and a sewing machine part (3) for needle-dropping with respect to the rotating sewing object and sewing with double chain stitch with two needles is provided in this sewing machine part. A presser foot (free presser foot 95) for pressing the sewing object to the needle drop side is provided, and a recess (96) is provided on the sewing object pressing surface (96) of the presser foot.
a, 96b) is formed, and this recess is formed from the needle through hole (95a, 95b) formed in the presser to the opposite side (arrow b) in the sewing direction, and the needle drop at the present position is formed. The sewing device (1) prevents the needle thread from being pressed by the pressing surface from the position to the needle drop position one stitch before.

According to the sewing apparatus of the thirteenth aspect, by the depression formed in the pressing surface of the presser foot, the needle thread is pressed from the present needle drop position to the needle drop position one stitch before. Pressing can be prevented.

Therefore, according to the sewing apparatus of the thirteenth aspect, since the thread one stitch before is not pressed by the presser foot,
The entanglement of the threads is good, and the sewing tightness can be kept in a good state.

[0056]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the structure will be described.

FIG. 1 is an overall perspective view of an automatic sewing machine according to an embodiment of the present invention.

This sewing device is used to sew an airbag to be mounted on an automobile by double needle double chain stitching.

As shown in FIG. 1, the automatic sewing machine 1 is roughly divided into a workpiece holding device 2 and a sewing machine device 3.

First, the mechanism of the sewn object holding device 2 will be described.

FIG. 2 is a perspective view for explaining the mechanism of the sewn object holding device 2.

The sewn object holding device 2 includes rotary shafts 10 and 11.
The two shafts 10 and 11 are connected by a fixed joint 12, and both ends of the bearings 13 are mounted on a machine frame (not shown).
And 14 vertically and rotatably. In addition, the rotating shafts 10 and 11 are provided with a support frame 15.
Are provided rotatably at both ends of the rotating shafts 10 and 11. An arm 16 is provided from the upper end side of the support frame 15.
Is horizontally extended, and a swing cylinder 17 which is a pneumatic cylinder provided rotatably in the horizontal direction on a machine frame (not shown) is connected to the lower end side of the support frame 15 to drive the support frame 15 in the horizontal direction. .

Upper and lower cylinders 18 and 19 which are pneumatic cylinders are provided in series at the tail end of the arm 16, and one end side of a connecting plate 20 is connected to the upper and lower cylinders 18 and 19 by a joint 32. The connecting plate 20 is driven in the vertical direction. One end of a vertical slide shaft 21 whose axial direction is a vertical direction is fixed to the other end of the connecting plate 20. A sprocket 22 is provided on a predetermined slider (not shown) provided on the vertical slide shaft 21.
The rotating shaft 10 is also provided with a sprocket 23, and a belt 24 is stretched between the sprockets 22 and 23. The other end of the vertical slide shaft 21 has an upper presser 25
Has been fixed.

The lower presser foot 26 is fixed to the tail end side of a lower shaft 27 which is rotatably supported by a machine frame (not shown), a sprocket 28 is fixed to the lower shaft 27, and the rotary shaft 11 is also fixed. A sprocket 29 is fixed, and a belt 30 is stretched over both sprockets 28 and 29.

FIG. 3 is a perspective view of the upper presser foot 25. The upper die retainer 25 is divided into a plurality of partial upper plates 40 .... Each partial upper plate 40 is supported by a disk 41 fixed to one end of the vertical slide shaft 21. Partial top plate 4
0 and the disc 41 are connected by a four-node link mechanism 42, and the four-node link mechanism 42 is driven by a cylinder 43. That is, when the four-bar linkage mechanism 42 is pushed out by the cylinder 43, the respective partial upper plates 40 move so as to spread toward the outer peripheral side of the upper die presser 25.

Next, the mechanism of the sewing machine device 3 will be described.

As shown in FIG. 1, the sewing machine device 3 includes a base 50, and a sewing machine mounting table 51 that moves toward and away from the workpiece holding device 2 on a predetermined straight line on the base 50.
Sewing machine arm 53 provided on this sewing machine mounting table 51
And

For the convenience of sewing double chain stitches in parallel with two needles, the longitudinal direction of the sewing machine arm 53 of the sewing machine arm 53 is provided at an acute angle to the approaching and separating movement direction of the sewing machine mounting table 51. There is.

As shown in FIG. 4, a lower thread trimming device 60 is provided on a surface 62 of the sewing machine arm 53 on the side of the workpiece holding device 2 on the end face in the longitudinal direction. This lower thread cutting device 60
Is equipped with an electric heater 61 and a predetermined device (described later) for moving the electric heater 61 up and down, and cuts the lower thread after sewing on the lower side of the end face 62.

Reference numeral 64 is an upper thread trimming device, which is provided with a predetermined thread trimming knife and a predetermined cylinder for driving the knife.

As shown in FIGS. 5 to 7, the sewing machine arm 5
A front roller driving device 7 is provided on the entire surface of 3.

The front roller driving device 7 includes a front roller 71. The gearbox 72 has a front roller drive motor 72
a is provided, and the front roller 7 is provided via the drive shaft 72b.
1 is provided. The continuous rotation of the front roller drive motor 72a is transmitted to the front roller 71 via the gear box 72 and the drive shaft 72b, and the front roller 71 continuously rotates. The gear box 72 is attached to the position adjusting plate 73 rotatably in the horizontal direction by an angle variable fulcrum step screw 73b.

The gear box 72 is provided with an arcuate curvature rack 74a. Further, the position adjusting plate 73 is provided with an angle varying motor 75, and the motor shaft 75a of the angle varying motor 75 is provided with a pinion 74b that meshes with the curvature rack 74a. An upper and lower unit case 76 is fixed to the sewing machine arm 53. A vertical drive air cylinder 77 is fixed to the vertical unit case 76. Reference numeral 78 is a vertical slide plate,
The rod end 77 of the vertical drive air cylinder 77 is provided on one side.
a is fixed, and is guided up and down by the guide 76a. A position adjusting plate 73 is fixed to the other of the upper and lower slit plates 78.

As shown in FIG. 8, a rear roller driving device 8 is provided on the rear surface of the sewing machine arm 53.

The rear roller driving device 8 includes a rear roller 81. The sprocket 82a is fixed to the upper shaft 94 which is driven by the sewing machine drive motor 91 via the timing belt 92 and the sprockets 82a and 93b (see also FIG. 13 described later). This sprocket 82a,
Through the timing belt 83 and the sprocket 82b,
Drive the shaft 84. The continuous rotation of the shaft 84 is converted into an intermittent rotation drive of a predetermined pitch via an intermittent drive / pitch changing device 85, transmitted to a gear box 87 via a universal joint 86, and the number of rotations is increased by the gear box 87. The rear roller 81 fixed to the drive shaft 87a is rotated. Reference numeral 88 is a vertical drive air cylinder, and a gear box 87 is fixed to a rod end 88a of the vertical drive air cylinder 88.

As shown in FIG. 9, the free presser 95 provided in the sewing machine 1 is formed with two needle insertion holes 95a and 95b corresponding to two needles. Recesses 96a and 96b are formed on the pressing surface 96 (contact surface with the cloth) of the free pressing member 95. The recesses 96a and 96b are formed from the needle through holes 95a and 95b formed in the presser 95 to the side opposite to the sewing direction (the feed side of the sewing object 201 [arrow a]). The recesses 96a and 96b have such a spread that they are always covered on the needle thread after sewing from the needle drop position where the sewing object 201 is currently located to the needle drop position one stitch before during sewing. It prevents the pressing surface 96 from pressing the needle thread.

As shown in FIG. 10, feed dogs 98a are provided on the sides of the needle drop positions 97a and 97b of the needle plate 97. The feed dog 98a is provided on the outer edge side (left side in the sewing direction [opposite side of the arrow a] in FIG. 9) of the sewn item from the needle drop position of the needle plate 97, and is provided on the opposite side. Not not. Further, another feed dog 98b is provided in front of the needle drop position of the needle plate 97 (on the entry side of the sewing object 201).

Next, the structure of the control system of the sewing device 1 will be described.

11 to 13 are block diagrams showing the configuration of the control system of the sewing device 1, which is divided into three diagrams for the sake of convenience.

As shown in FIG. 11, the CPU 100, RA
M101, ROM 102, floppy disk drive 103, input device 104, operation panel 105, display device 106, θ-axis motor 107, sewing machine motor 91, R-axis motor 108, front roller drive motor 72a, rotation direction control motor 75, heater energizing switch. 109, rotation sensor 1
10, the solenoid valves 111 to 118, 121 and the magnetic disk device 119 are connected by a bus 120. Note that, for convenience, the I / O interface, the motor driver, and the like are not shown. Further, other various actuators, various sensors, etc. are also connected by the bus 120,
Illustration is omitted (individually described later).

The ROM 102 stores various control programs for the sewing machine 1.

The input device 104 is a predetermined keyboard device.

The operation panel 105 is a panel in which switches for operating the sewing machine 1 are arranged.

As shown in FIG. 12, the cylinder 18 and the solenoid valves 111 and 112 are connected by a predetermined air passage,
The cylinder 18 is driven by opening and closing the solenoid valves 111 and 112. The cylinder 19 and the solenoid valve 113 are connected by a predetermined air flow path, and the cylinder 1 is opened and closed by opening and closing the solenoid valve 113.
9 is driven.

The cylinder 17 and the solenoid valves 114 and 115 are connected by a predetermined air passage, and the solenoid valves 114 and 115 are connected.
It is driven by opening and closing. The support frame 15 is
The cylinder 17 is rotatably supported by the support portions 33 and 34.
Thus, even if the upper presser foot 25 is driven, the rotary shafts 11 and 12 are not rotated (see FIG. 2).

The θ-axis motor 123 is a motor which is connected to the rotary shaft 11 and rotates the rotary shafts 10 and 11. The rotation sensor 110 detects the rotation angle of the rotation shaft 10.

As shown in FIG. 13, the R-axis motor 125 drives the drive shaft 130 provided on the lower side of the sewing machine mounting table 51. Further, the driven shaft 13 is provided below the sewing machine mounting table 51.
1 is also provided, a belt 132 is stretched over the drive shaft 130 and the driven shaft 131, and the sewing machine mounting table 51 is moved to a predetermined position with respect to the sewing target holding device 2 by the driving of the R-axis motor 125. Move closer and further apart on a straight line.

The cylinder 63 is provided in the bobbin thread cutting device 60 (see FIG. 4) and moves the electric heater 61 up and down. The cylinder 63 and the solenoid valves 116 and 117 are connected by a predetermined air passage, and the cylinder 63 is driven by opening and closing the solenoid valves 116 and 117.

Heater energizing switch 109 and electric heater 6
When the heater energizing switch 109 is turned on, the electric heater 61 is energized to heat the electric heater 61.

Cylinders 77 and 88 and solenoid valves 118 and 12
1 is connected by a predetermined air flow path, and solenoid valves 118, 12
The cylinders 77 and 88 are driven by opening and closing 1.

Next, the operation of the sewing device 1 will be described.

Referring to FIG. 14, first, when the power of the sewing device 1 is turned on (step S1), the CPU 100
Check whether each sensor operates normally (Step S
2) Read or register data such as a predetermined sewing pattern (step S3 [details will be described later]). After that, based on the sewing pattern data, the θ-axis motor 123 is driven to rotate the rotary shafts 10 and 11, and the R-axis motor 125 is driven to rotate the rotary shafts 130 and 131, and the origin position of the sewing start is started. Is searched (step S4). When the home position is searched, the operation is ready (step S5), and the sewing machine stands by in a sewing-ready state.

After this, if the previously sewn object 201 to be sewn remains between the upper and lower mold clamps 25 and 26, it is removed and a new object to be sewn 201 is set (step S6). Operate 105 and presser foot 25
And 26 hold the sewing object 201 (step S7).
That is, the cylinder 17 is driven to set the upper presser foot 25 on the lower presser foot 26, and the cylinders 18 and 19 are driven to clamp the central portion of the sewing object 201 between the upper and lower presser feet 25 and 26 (see FIG. 12). . At this time, the cylinders 43 are driven and the four-joint link mechanism 42 is pressed by the partial upper plates 40 so that the to-be-sewn object 201 is extended toward the outer peripheral side thereof.

After that, by operating the operation panel 105,
Predetermined loading (step S8 [details will be described later]) is performed, and predetermined sewing is performed (step S9 [details will be described later]). When this sewing is completed, a predetermined upper thread trimming and lower thread trimming operation is performed (step S10 [details will be described later]). Thereafter, when the power of the sewing apparatus 1 is not turned off, the process returns to step S5, and waits in the operation preparation state (step S11).

The reading / registration of data such as a sewing pattern (step S3) will be described in detail with reference to FIG.

As shown in FIG. 15, first, the sewing pattern data (at the time of previous sewing), the predetermined front roller data, and the predetermined operation mode are stored in the magnetic disk device 119, and the CPU 100 stores these data. The presence / absence is confirmed (step S30), and the presence / absence and the content of the data are displayed on the display device 106. If such data exists and there is no problem in performing sewing using this data (step S31), such data is read into the RAM 101 by operating the operation panel 105 (step S3).
2) Reading and registration of data such as sewing patterns is completed.

Even if the previous data stored in the ROM 102 is not used, if the data to be used is stored in the floppy disk 103, the floppy disk 10 is loaded in the floppy disk drive (not shown).
3 is loaded and the RAM is operated by operating the operation panel 105.
You may read in 101.

There is no such existing data as above,
Alternatively, if such data is not used, sewing data is newly created (step S3).
3).

Regarding the creation of such data, FIG.
This will be described with reference to FIG.

Referring to FIG. 16, reference numeral 140 is a locus indicating a desired sewing position. Since the sewing device 1 is a sewing machine that performs two-needle sewing, this locus 140 is actually a locus of the center position between the two needles. The locus of this sewing position 14
The sewing pattern data is calculated from the data on the sewing position including the data on the curvature of 0. That is, in this example, the radii of curvature R1, R2, R3, and R4 and the locus 14
A predetermined calculation is performed based on a total of six parameters, that is, the widths X1 and Y1 of 0 in the xy direction.

That is, as shown in FIG. 17, first, the locus 140 of FIG. 16 and the predetermined polar coordinates are overlapped, and the intersection point of the polar coordinates most approximate to the locus 140 is set so that the sewing pitch becomes a substantially constant pitch P. Needle drop positions a1, a2, ..., a
Decide on 10, ... The movement of the sewing machine mounting table 51 by the drive of the R-axis motor 125 is controlled by the distances R1, R2, ..., R8, R9 ,. Formed angle θ1, ..., R8 and R
The angle θ8 formed with 9 ... Controls the rotation angles of the upper and lower mold pressers 25 and 26 driven by the θ-axis motor 123.

R1 obtained on polar coordinates as described above ...
… 、 Θ1 …… Correct the needle drop position to a position where it can be driven,
The most approximate data is the sewing pattern data.

FIG. 17 shows the concept of the calculation performed by the sewing device 1. In reality, the maximum error when creating polar coordinate data is ± 0.092 mm. That is, the drivable position correction is performed within a range of ± 0.092 mm.

As shown in FIG. 15, the sewing pattern data created in step S33 is displayed on the display device 1 as described above.
After confirmation in step 06 (step S34), the sewing operation is confirmed (step S35). That is, the sewing operation data stored in the ROM 102 or the floppy disk 103 is confirmed on the display device 106.

Also, predetermined front roller data (described later) is created.

When the mode of the sewing operation data is not changed (step S36), the operation panel 105 is operated to
The sewing pattern data created above, the front roller data,
The sewing operation data is registered in the magnetic disk device 119.
Further, if necessary, it is also registered in the floppy disk 103 (step S38).

When it is necessary to change the sewing operation data, the sewing operation data is input by the input device 104 in accordance with the support of the screen of the display device 106. That is, various modes such as the sewing machine speed and the stitch mode (the start of sewing is selected from standard, soft start or condensed sewing, etc.) are set (step S37).

Next, the loading (step S8)
Will be described.

As shown in FIG. 18, first, the operation panel 1
When the start switch at 05 is set to 0N (step S4)
1) Air is blown out from a predetermined cloth end blow nozzle (not shown) (step S42). After that, the sewing machine arm 53 is moved by the drive of the motor 125 to start moving the two needles to a predetermined sewing start position (step S43). The outer peripheral portion that serves as a seam allowance of the sewing object 201 is free,
The air blown from the cloth end blow nozzle does not hang down, and the outer peripheral portion of the sewing object 201 does not go under the sewing machine mounting table 51. When the two needles reach the predetermined sewing start position, the motor 125 stops (step S44).

Thereafter, the solenoid valve 118 is used to move the cylinders 77, 8
8 is driven to lower the front and rear rollers 71 and 81 to contact the sewn object 201. Further, the free presser 95 also descends by a predetermined actuator and comes into contact with the sewing object 201 (see FIG. 19). The positions of the front and rear rollers 71 and 81 and the free presser 95 at this time will be described with reference to FIGS. 20 and 21.

As shown in FIG. 20, in the sewing machine 1, a straight line L1 passing through the center of rotation A of the upper and lower pressers 25 and 26 and the center B of the needle bar of the sewing machine arm 53 and the longitudinal direction of the sewing machine arm 53 form an acute angle. Is doing. As a result, the horizontal line L2 (predetermined reference) orthogonal to the straight line L1 and the sewing machine arm 5
A horizontal line L3 (reference of the sewing machine arm) orthogonal to the length direction of 3 forms an acute angle.

As shown in FIG. 21, the midpoint between the tips of the two needles inserted through the two needle insertion holes 95a and 95b of the free presser 95 is the center B of the needle bar. Since the sewing device 1 has two needles, the coordinates of the needle drop position indicated by the sewing pattern data are the coordinates of the needle bar center B for convenience.

The front roller 71 is provided on the side opposite to the rotation direction (arrow b) of the sewing object 201 when viewed from the needle drop position (needle bar center B). The position is the needle drop position 9
It is closer to the outer edge side of the to-be-sewn object 201 from the scheduled sewing position loci M1 and M2 in front of 9a and 99b. Furthermore, the scheduled sewing position loci M1 and M at the needle drop position of the sewn object 201
The tangential direction L4 of 2 (in this example, the movement locus of the needle bar center B) and the pulling direction (direction of the roller surface) L5 of the peripheral portion of the sewn object 201 by the rotation of the front roller 71 make an acute angle. .

In the front-rear direction of the free presser 95, the reference L3 of the sewing machine arm is the direction of sewing with two needles, and as described above, the direction of sewing L3 is for convenience of performing shape sewing by double chain stitching of two needles. Does not match the tangential direction L4 of the sewing shape and forms an acute angle.

The rear roller 81 is positioned on the reference L3 of the sewing machine arm, on the side of the moving direction (direction of arrow b) by the rotation of the sewing object 201 as viewed from the needle drop position (needle bar center B), and the sewing object is sewn. Contact 201.

Next, the sewing (step S9) will be described.

Referring to FIG. 22, first, the front roller drive motor 72a drives the front roller 71 to rotate in the direction of arrow c (see FIG. 21). The front roller 71 abuts on the outer peripheral portion of the sewn object 201 at the above position and rotates to extend the needle drop position of the sewn object 201 (step S51).
As a result, the front roller 71 moves the sewing object 201 in the direction of the normal line L1.
The sewn object 201 is pulled to the outer edge side and the sewn object movement side (direction of arrow b) in the tangential line L4 direction.

Next, the sewing machine motor 91 is driven to drive the upper shaft 9
4 is rotated to start driving the needle bar, the feed dogs 98a and 98b, and the rear roller 81 (step S52). As a result, the rear roller 81 comes into contact with the outer peripheral portion of the sewn object 201 and rotates at the position, so that the sewn object 201 is sewn at that position.
Pull to extend.

By driving the motors 123 and 125, the upper and lower presser feet 25 and 26 are synchronously rotated with a variable angular velocity, and the two needles of the sewing machine arm 53 rotate the upper and lower presser feet 25 and 26 in the direction of the normal line L1. The sewing machine moves so as to approach or separate from the center, and shape sewing according to a predetermined sewing pattern starts (step S53).

At this time, the upper and lower pressers 25 and 26 continuously rotate and do not stop even when the needle is dropped. Also,
The front roller 71 also rotates continuously.

The front roller data includes data (front roller rotation data) regarding the rotation angle of the front roller 71 by the motor 75 and the direction of rotation for each needle drop. Then, as shown in FIG. 23, when there is a change in the tangential line L4 direction of the sewing shape between a certain needle drop position n to the sewing object 201 and the next needle drop position n + 1, the needle from the certain needle drop position n After pulling out, the direction of the contact surface of the front roller 71 is adjusted by driving the motor 75 until the needle tip comes into contact with the next needle drop position n + 1. This is performed between all adjacent needle drop positions as long as there is a change in the tangential line L4 direction. As a result, the needle drop positions n, n + 1, and n + onto the sewing object 201.
The angle formed by the tangential direction L4 in 2, n + 3, ... And the pulling direction of the sewn object 201 by the front roller 71 is maintained at a constant acute angle (40 ° in the example of FIG. 20).

The angle difference between the line connecting the needle drop positions n and n + 1 and the line connecting the needle drops n + 1 and n + 2 to the work 201, the line connecting the drop positions n + 1 and n + 2 and the needle drop n +.
The angle difference between the line connecting 2 and n + 3, ... May be replaced with the angle difference in the tangential line L4 direction.

Further, in the example shown in FIG.
As the needle drop position moves to each of the needle drop positions n, n + 1, n + 2, n + 3, ..., The angle between the direction of the contact surface of the front roller 71 and the predetermined reference is 30 °, 24 °, 34 °. ,
It changes to 44 ° ...

Further, the front roller data may include front roller contact / release data, front roller pressure data, and front roller rotation speed data in addition to or instead of the front roller rotation data. These data are data for designating the coordinates indicated by the sewing pattern data, contacting or releasing the front roller 71, adjusting the contact pressure as desired, or adjusting the rotation speed as desired. .
When these data are included, the front roller 71 is contacted or released, or the contact pressure is adjusted as desired, or the rotation speed is adjusted as desired according to the data.

In this way, sewing is performed in accordance with the sewing pattern data, and when this sewing is completed, the motor 91
Stop the sewing machine upper shaft 94 (step S
55), the motor 72a is stopped to stop the rotation of the front roller 71 (step S56). After that, the cylinder 77,
88 and a predetermined actuator drive the front and rear rollers 7
1, 81 and the free presser foot 95 are raised (step S5)
7).

Upper thread trimming and bobbin thread trimming operations (step S1)
0) will be described.

Referring to FIG. 4, first, in the upper thread trimmer, an upper thread trimming knife (not shown) is driven by an air cylinder (not shown) so as to push out from the upper thread trimmer 64 and advance to the upper thread. The thread loosening is activated to loosen the upper thread, and then the upper thread trimming knife retracts to cut the upper thread.

Next, regarding the bobbin thread trimming operation, first, when sewing is completed as described above, the heater energizing switch 109 is turned on to energize the electric heater 71. Then, the cylinder 73 is driven by opening and closing the electromagnetic valves 116 and 117 to lower the electric heater 71 to the position of the lower thread, and the electric heater 71 cuts the lower thread. After this, the electric heater 7
1 to the original position and the heater energizing switch 11
0 is turned off and the electric heater 71 is turned off.

In normal sewing, a sewing object that passes under the presser foot can smoothly pass because it enters from the curved front end portion of the upward presser foot. In the case of sewing along the curve of the outer peripheral portion of 201, since the cloth presser 95 enters obliquely to the side of the cloth presser 95, the cloth presser 95 enters not from the upward curved portion but from the lateral flat portion of the cloth presser 95. In such a sewn object 201, the side of the presser foot 95 is clamped and held by the upper and lower die pressers 25 and 26, but the other end side is a free end, and therefore the presser foot 9 is pressed by the presser pressure.
It stops on the side of 5, and is moved by changing the moving direction so as to follow the side surface of the cloth presser 95, and cannot pass smoothly. Then, the sewn object 20 is transferred one after another from an oblique direction.
1 is pleated between the side of the cloth presser 95 and the upper and lower die pressers 25 and 26, and the sewn object 201 gradually presses the side of the presser foot 95, and finally the pleated shape. As it passes through the lower part of the presser foot 95, the to-be-sewn object 201 gets wet in a pleated shape.

According to the sewing device 1, the front roller 71 is provided on the side opposite to the rotation direction (arrow b) of the sewing object 201 when viewed from the needle drop position of the sewing machine 3 (the side from which the needle drops). By rotating the front roller 71 in contact with the outer peripheral portion of the sewn object 201 at that position, the sewn object 201 to be pressed down at the needle drop position of the sewn object 201 is pulled, whereby
As described above, since the sewn object 201 obliquely transferred from below the cloth presser can be smoothly fed below the cloth presser 95 even if it hits the side of the cloth presser, the sewn object 201 is clamped at its central portion. By cooperating with the upper and lower presser foots 25 and 26, the sewn object 201 can be in an extended state, so that a beautiful sewing shape can be obtained and the sewn object 20
1 is not sewn into pleats.

Further, the abutting position of the front roller 71 with respect to the sewn object 201 is further toward the outer edge side of the sewn object 201 from the scheduled sewing position locus before the needle drop position from the sewing machine arm 53. Since the central portion of the to-be-sewn object 201 is clamped by the upper and lower mold clamps 25 and 26, it is necessary to move the sewing tool 201 toward the outer edge side of the to-be-sewn object 201 further from the scheduled sewing position locus before the needle drop position. Since the contact position is preferable for preventing displacement of the sewn item 201 around the needle drop position, the contact position of the front roller 71 with respect to the sewn item 201 is set to an appropriate position to further improve the sewing shape. It is also possible to prevent pleated sewing more reliably.

Further, the tangential direction L4 of the sewing position locus at the needle drop position of the sewn object 201 and the pulling direction L5 of the sewn object 201 due to the rotation of the front roller 71 make an acute angle, whereby the front roller 71 is moved. Sewing is performed on the outer peripheral side of the sewing object 201 in the direction of the normal line L1 extending from the rotation center A of the upper and lower pressers 25, 26 to the needle drop position of the sewing object 201 and the moving side of the sewing object 201 in the tangent line L4 direction. Since the object 201 is pulled, there is no difficulty in relation to the rotation direction of the sewn object 201, and the desired direction of the front roller 71 is given to further ensure the clean sewing shape and the prevention of pleated sewing. can do.

In addition, the front roller 71 is used for the sewing object 201.
When there is a change in the tangential direction L4 to the sewing shape between a certain needle drop position and the next needle drop position, after the needle is pulled out from one needle drop position until the needle tip comes into contact with the next needle drop position. Further, the direction of the contact surface of the front roller 71 is adjusted by driving the motor 75, and the tangential direction L4 with respect to the sewing shape at each needle drop position on the sewn object 201 and the pulling direction of the sewn object 201 by the front roller 71. Since the angle formed by and is maintained at a constant acute angle, the pulling state of the front roller 71 by the front roller 71 can be uniformly maintained even when the curvature of the sewing shape varies. By constantly maintaining the desired state, it is possible to make the sewing shape more beautiful and prevent pleated sewing more reliably.

Further, according to the sewing device 1, the front roller 71
In addition to the above, a rear roller 81 is provided. The rear roller 81 is provided on the side of the sewing machine 201 in the direction of rotation (arrow b) of the sewing machine arm 53 as viewed from the needle drop position, and rotates by contacting the outer peripheral portion of the sewing machine 201 at that position. The sewn object 201, which is pressed down at the needle drop position, is brought into a stretched state by the cooperation of the upper and lower pressers 25, 25 and the front roller 71. That is, with respect to the needle drop position of the sewn object 201, the center part of the sewn object 201 is clamped by the upper and lower mold clamps 25, 26, the sewn object 201 is extended by the front roller 71, and the sewn object by the rear roller 81. Since the extension 201 is supported at three points, the deviation of the needle drop position can be reliably prevented as compared with the case of only the front roller 71 (two-point support). Therefore, by adding the rear roller 81, the sewing shape can be made more beautiful, and the pleated sewing can be prevented more reliably.

On the sewing position locus, the pulling of the sewn object 201 by the front roller 71 is stopped or weakened, and the rear roller 81 is pulled.
It may be more convenient to prevent the needle drop position of the sewn object 201 from shifting by using only the pulling by or the pulling center by the rear roller 81.

According to the sewing device 1, the section in which the front roller 71 is brought into contact with the sewn object 201 and the section in which the front roller 71 is released are designated on the locus of the sewing position, and the sewn object 201 by the rear roller 81 is designated. At a position where it is more convenient to pull only, the contact shape of the front roller 71 with respect to the object to be sewn 201 is released, whereby the sewing shape can be further cleaned and pleated sewing can be prevented more reliably. .

Similarly, a section is designated on the sewing position locus,
When it is better to set the pulling center of the sewn object 201 by the rear roller 81, the contact pressure of the front roller 71 on the sewn object 201 is adjusted according to the locus of the sewing position, or the rotation of the front roller 71 is adjusted. Since the speed can be adjusted, the sewing shape can be further cleaned and pleated sewing can be prevented more reliably.

In the sewing apparatus 1, the upper and lower presser feet 25, 26 are continuously rotated by the motor 123 for sewing.
Does not stop even when the needle is dropped. In the case of performing such sewing, if the front roller 71 is rotated intermittently in accordance with the needle drop, small wrinkles are accumulated on the sewn object 201, impairing the cleanness of the sewing shape, and finally, Pleated stitches are formed. However, according to the sewing device 1,
Since the front roller 71 is also continuously rotated by the motor 72a,
Accumulation of small wrinkles on the sewn object 201 is prevented, the sewing shape is cleaned, and pleated sewing is prevented.

Before the rotation of the upper shaft 94, the front roller 71 starts the extension of the sewing object 201 near the needle drop position (see steps S51 and S52), and after the rotation of the upper shaft 94 is stopped, the sewing by the front roller 71 is performed. Since the extension of the material 201 is completed, the needle drop position of the sewing object 201 is in the extended state when the needle is first dropped after sewing is started, and the needle drop of the sewing object 201 is completed before the sewing is completed. Since the extended state of the position is not released, the proper driving start and end timings of the front roller 71 are given to clean the sewing shape at the start and end of sewing, and the pleat-like sewing is performed. It is prevented from occurring.

According to the sewing device 1, the feed dog 98a provided on the side portion of the needle drop position (direction of the normal line L1) is closer to the outer edge side of the sewing object 201 than the needle drop position (outside the curve of the sewing shape).
Since it is provided only on the other side and not on the opposite side, the thread after sewing is not damaged by the feed dog. In addition, since the thread after sewing is not pulled by the feed dog, it is possible to maintain a good sewing tightness.

According to the sewing device 1, recesses 96a and 96b are formed in the pressing surface 96 of the free presser 95.
6a and 96b are needle insertion holes 95 formed in the presser foot 95.
It is formed from a, 95b to the side opposite to the sewing direction (direction of arrow b), and it is 1 from the needle drop position at the present position.
Since the pressing of the needle thread by the pressing surface 96 to the needle drop position before the needle is prevented, the entanglement of the thread is good, and the sewing tightness can be maintained in a good state.

Needless to say, the sewing device 1 described above does not limit the present invention.

For example, the position adjusting plate 73 may be configured as shown in FIG. That is, the position adjusting plate 73 is formed of two plates, a position adjusting plate 734a and a position adjusting plate 734b, and long holes 731a and 731b are formed in each of them, and the gear box 72, and thus the front roller 71, and the screw 732b. Is rotated about the position adjustment plate 734b in the direction of the arrow e and fixed by a screw 733b. Similarly, the position adjustment plate 734b is rotated about the screw 732a for position adjustment. The fixed mounting position of the front roller 71 may be adjusted by rotating the plate 73a by a desired angle in the direction of the arrow f and fixing it with the screw 733a. This makes it possible to adjust the contact position and the rotating direction of the front roller 71 with respect to the sewing object 201 to a desired fixed position.

[0144]

According to the first aspect of the invention, the central portion of the sewn object is clamped and rotated, and the center of rotation and the needle drop position of the sewing machine portion are approached and separated from each other, and the sewn object is sewn. In an automatic sewing machine that stitches needles along the outer peripheral portion of a material, a beautiful sewn shape can be obtained by using a predetermined rotating body, and the sewn object is sewn in a pleated shape. There can be no.

According to the second aspect of the present invention, the first aspect is provided.
According to the invention described in (1), by adding the second rotating body, the sewing shape can be made more beautiful, and the pleated sewing can be prevented more reliably.

According to the invention of claim 3, claim 2
In the invention described in (3), at the position where it is more convenient to pull only the sewn object by the second rotating body, by releasing the contact of the first rotating body with the sewn object, the sewing shape can be further cleaned. However, it is possible to more reliably prevent the pleated sewing.

According to the invention of claim 4, claim 2
Alternatively, in the invention according to claim 3, at a position where it is more convenient to set the pulling center of the sewn object by the second rotating body, it is possible to weaken the contact pressure of the first rotating body with respect to the sewn object. This makes it possible to make the sewing shape more beautiful and prevent pleated sewing more reliably.

According to the invention of claim 5, claim 2
In the invention according to claim 4, at a position where it is more convenient to set the pulling center of the sewn object by the second rotating body, this is realized by reducing the number of rotations of the first rotating body, and sewing is performed. The shape can be made even more beautiful, and pleated sewing can be prevented more reliably.

According to the invention of claim 6, claim 1
According to the invention of claim 5 to 5, by constantly maintaining the pulling state of the first rotating body at a desired constant state, the sewing shape can be further cleaned and the pleated sewing can be prevented more reliably. it can.

According to the invention of claim 7, claim 1
According to the sixth aspect of the invention, the mounting position of the first rotating body can be adjusted as desired, and a desired arrangement state of the predetermined rotating body can be selected.

According to the invention of claim 8, claim 1
According to the invention described in claim 7, by setting the contact position of the first rotating body with respect to the object to be sewn to an appropriate position, the sewing shape is made more clean and the pleated sewing is prevented more reliably. be able to.

According to the invention of claim 9, claim 1
According to the eighth aspect of the present invention, by providing a desired orientation of the first rotating body, it is possible to further ensure the clean sewing shape and the prevention of pleat-like sewing.

According to the invention described in claim 10, in the invention described in any one of claims 1 to 9, even when the holding portion is continuously rotated, the sewing shape is clean and the pleat-like sewing is prevented. To be done.

According to the eleventh aspect of the present invention, with respect to the first to tenth aspects of the present invention, appropriate timing for starting and ending driving of the first rotating body or the second rotating body is provided. , Clean the sewing shape at the start and end of sewing to prevent pleated sewing.

According to the twelfth aspect of the present invention, in the sewing device for sewing by dropping the needle along the outer peripheral portion of the rotating sewn object, the thread after sewing is not damaged by the feed dog, and , It is possible to maintain a good sewing condition.

According to the thirteenth aspect of the present invention, the needle is dropped along the outer peripheral portion of the rotating sewn object, and two needles are used to remove the needle.
In a sewing device in which the tangential direction of the sewing line and the sewing direction are not the same, which is subjected to heavy chain stitching, it is possible to maintain a good state of tightness of the sewing.

[Brief description of drawings]

FIG. 1 is an external perspective view of the entire sewing device that is an embodiment of the present invention.

FIG. 2 is a perspective view of a sewn object holding device of a sewing device that is an embodiment of the present invention.

FIG. 3 is a perspective view of the upper presser foot of the sewing device according to the embodiment of the present invention.

FIG. 4 is a perspective view illustrating a thread cutting device of a sewing device that is an embodiment of the present invention.

FIG. 5 is a perspective view illustrating a front roller drive mechanism of the sewing device that is an embodiment of the present invention.

FIG. 6 is a front view illustrating a front roller drive mechanism of the sewing device according to the embodiment of the present invention.

FIG. 7 is a plan view illustrating a front roller drive mechanism of the sewing device that is an embodiment of the present invention.

FIG. 8 is a perspective view illustrating a rear roller drive mechanism of the sewing device that is an embodiment of the present invention.

FIG. 9 is a bottom view of the free presser used in the sewing device according to the embodiment of the present invention.

FIG. 10 is a plan view of a feed dog used in the sewing device according to the embodiment of the present invention.

FIG. 11 is a block diagram illustrating a configuration of a control system of the sewing device that is an embodiment of the present invention.

FIG. 12 is a block diagram illustrating a configuration of a control system of the sewing device that is an embodiment of the present invention.

FIG. 13 is a block diagram illustrating a configuration of a control system of the sewing device that is an embodiment of the present invention.

FIG. 14 is a flowchart explaining the operation of the sewing device according to the embodiment of the present invention.

FIG. 15 is a flow chart (reading / registration of a sewing pattern or the like) for explaining the operation of the sewing device according to the embodiment of the present invention.

FIG. 16 is a view for explaining the calculation of sewing pattern data of the sewing device that is an embodiment of the present invention.

FIG. 17 is a view for explaining calculation of sewing pattern data of the sewing device which is the embodiment of the present invention.

FIG. 18 is a flowchart (loading) for explaining the operation of the sewing device according to the embodiment of the present invention.

FIG. 19 is a perspective view of a needle base portion of the sewing device according to the embodiment of the present invention.

FIG. 20 is a view for explaining the arrangement of the front and rear rollers and the free presser of the sewing device according to the embodiment of the present invention.

FIG. 21 is a view for explaining the arrangement of the front and rear rollers and the free presser of the sewing device according to the embodiment of the present invention.

FIG. 22 is a flowchart (sewing) for explaining the operation of the sewing device according to the embodiment of the present invention.

FIG. 23 is a view for explaining the angle adjustment of the front roller of the sewing device which is an embodiment of the present invention.

FIG. 24 is a perspective view showing a modified example of the sewing device according to the embodiment of the present invention.

FIG. 25 is a perspective view of an airbag that is a sewn object of the sewing device according to the embodiment of the present invention.

[Explanation of symbols]

 1 Sewing device 2 Sewing device holding device 3 Sewing machine device 10 Rotating shaft 11 Rotating shaft 25 Upper presser foot 26 Lower presser foot 51 Sewing machine mounting base 53 Sewing machine arm 71 Front roller 72a Front roller drive motor 73b Angle variable fulcrum step screw 732a Screw 732b Screw 733a Screw 733b Screw 734a Position adjusting plate 734b Position adjusting plate 74b Pinion 75 Angle changing motor 77 Air cylinder 81 Rear roller 95 Free press 95a Needle through hole 95b Needle through hole 96 Pressing face 96a Recess 96b Recess 100a CPU 101 RAM 102 ROM 103 Floppy disk drive 104 Input device 105 Operation panel 107 θ-axis motor 108 R-axis motor 119 Magnetic disk device 122 Electromagnetic valve 123 Electromagnetic valve A Rotation center B Needle drop position L1 method Direction L4 sewing position trajectory tangential L5 the sewing pulling direction M1 sewing expected position trajectory M2 sewing position scheduled rotation locus b the sewing direction 201 the sewing (automotive airbags)

Claims (13)

[Claims] 1. A holding portion for sandwiching and holding a central portion of a sewn object, a rotation driving portion for rotating the holding portion around a predetermined rotation center, and needle sewing to the rotating sewn object. A sewing machine section, a position adjusting section that approaches and separates the rotation center and the needle drop position of the sewing machine section, a storage section that stores information on the sewing position for the sewing object, and based on this position information, A sewing control unit that drives the rotation drive unit and the position adjusting unit to adjust the needle drop position while needle-falling along the outer peripheral portion of the sewn item, and seeing from the needle drop position of the sewing machine unit. It is provided on the side opposite to the rotating direction of the sewn object, and by contacting and rotating the outer peripheral portion of the sewn object at the position, the sewn object to be pressed at the needle drop position of the sewn object A first rotating body that is extended by cooperation with the holding portion. Eteiru, automatic sewing sewing machine. 2. The sewing machine is provided on the rotational direction side of the sewing machine as viewed from the needle drop position, and abuts on the outer peripheral portion of the sewing machine at the position to rotate the sewing machine, thereby rotating the sewing machine. The workpiece to be pressed at the needle drop position is the holding portion and the first
The automatic sewing machine according to claim 1, further comprising a second rotating body which is brought into an extended state by cooperation with the rotating body. 3. A rotation for storing information indicating a section in which the first rotating body makes contact with the object to be sewn and a section in which the release is made on the locus of the sewing position stored in the storage section. A body contact / release position storage section, and a rotor contact / release adjustment section for contacting and releasing the first rotating body with respect to the sewing object based on this information. Item 3. The automatic sewing device according to Item 2. 4. Information is stored that associates a specific section of the locus of the sewing position stored in the storage unit with a desired pressing force on the object to be sewn by the contact of the first rotating body. The rotary body pressure fluctuation storage unit, and a rotary body pressure adjusting unit that adjusts the contact pressure of the first rotary body with respect to the sewing object based on this information. The automatic sewing device described in. 5. A rotor speed variation storage unit for storing information in which a specific section of a locus of a sewing position stored in the storage unit and a rotation speed of the first rotor are stored, and to this information. The automatic sewing machine according to any one of claims 2 to 4, further comprising: a rotating body speed adjusting unit that adjusts a rotating speed of the first rotating body based on the rotating body speed adjusting unit. 6. A tangential line of a sewing position locus between a rotating body direction adjusting portion that adjusts a direction of a contact surface of the first rotating body, a needle drop position on the sewing object, and a next needle drop position. When there is a change in the direction, the direction of the contact surface of the first rotary body is adjusted by the rotary body direction adjusting unit until the needle tip comes into contact with the next needle drop position after pulling out the needle from a certain needle drop position. And a rotary body direction control unit for adjusting the tangential direction at each needle drop position to the sewing object and the pulling direction of the sewing object by the first rotating body to a constant acute angle. The automatic sewing device according to any one of claims 1 to 5, which is maintained. 7. A mounting position adjusting portion for adjusting a mounting position of the first rotating body is provided, and a contact position and a rotating direction of the first rotating body with respect to the object to be sewn can be adjusted by adjusting the mounting position. The automatic sewing machine according to any one of claims 1 to 6. 8. The method according to claim 1, wherein the abutting position of the first rotating body is further closer to the outer edge side of the sewn item from a scheduled sewing position locus before the needle drop position of the sewing machine portion. The automatic sewing machine according to any one of 1. 9. The tangential direction of the sewing position locus at the needle drop position of the sewn object and the pulling direction of the outer peripheral portion due to the rotation of the first rotating body form an acute angle, whereby the first The rotating body pulls the sewn object on the outer edge side of the sewn object in the normal direction extending from the rotation center of the holding portion to the needle drop position of the sewn object and on the sewn object moving side in the tangential direction. Item 9. The automatic sewing device according to any one of items 1 to 8. 10. The rotary drive unit is for continuously rotating the holding unit during sewing, and the first rotating body is for continuously rotating during sewing. Item 10. The automatic sewing machine according to any one of Items 9. 11. The first part before starting the needle drive of the sewing machine part.
At least one of the first rotating body and the second rotating body is started after starting rotation of at least one of the rotating body of 11. The automatic sewing machine according to any one of claims 1 to 10, further comprising: a rotating body control unit for ending the rotation of the sewing machine and ending the extension of the sewn object. 12. A holding portion for holding and rotating a sewn object, a sewing section for needle-falling and sewing along an outer peripheral portion of the rotating sewn object, and a needle provided on the sewing section. And a feed dog provided on a side portion of the needle drop position, wherein the feed dog feeds the sewn object only on the outer edge side of the sewn item from the needle drop position. 13. A holding part for holding a sewn object, a rotation driving part for rotating the holding part at a predetermined rotation center, a sewing direction at each needle drop position of the sewn object, and a tangential direction of a sewing position locus. And are arranged so as to form a predetermined acute angle,
A sewing machine portion that is needle-dropped to the rotating sewing object and is sewn by double chain stitching with two needles; and a cloth retainer that is provided on the sewing machine portion and presses the sewing object toward the needle drop side, A recess is formed on the surface of the presser foot to be sewn, and this recess is formed from the needle through hole formed in the presser to the side opposite to the sewing direction, and the needle drop position currently located by this recess is formed. A sewing device which prevents the needle thread from being pressed by the pressing surface from the front to the needle drop position one stitch before.