JPH0654972A - Sewing method by two-head sewing machine and device therefor - Google Patents

Abstract

PURPOSE:To resolve the narrow state at the time of setting a texture and a sewing start and perform the work via the handling advantageous to a worker by sewing the texture from the wide portion when both side edge sections of the texture having nonparallel width are concurrently sewn with a pair of sewing machines. CONSTITUTION:A texture 35 is fed to two sewing machines 1, 2, and the sewing machines 1, 2 are moved nearby or apart by a moving mechanism 30 synchronous with the rotation of a sewing machine main spindle for needle handling to form stitches along the cut shape of the texture 35. At the time of a sewing start, both side sections at one end of both side edge sections having a wide width are sewn with the sewing machines 1, 2 moved apart, then both side edge sections of the texture 35 are sewn toward a gore section 35b while the sewing machines 1, 2 are gradually moved nearby along the texture width, the gore section 35b is sewn at the constant width, and the texture 35 is sewn toward both side sections 35c at the other end of both side edges while the sewing machines 1, 2 are again separated. The setting and sewing start work of the texture 35 can be performed in the separated state of the sewing machines 1, 2, and the work can be performed via the handling advantageous to a worker.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing method using a two-head sewing machine and an apparatus therefor, and more particularly to a sewing method and an apparatus for simultaneously forming two rows of stitches on a cloth by two sewing machines arranged in parallel.

[0002]

2. Description of the Related Art Conventionally, as a device for simultaneously sewing both sides of a cloth with a pair of flat sewing machines, there is a machine in which two sewing machines are fixedly arranged at a predetermined interval. To sew both sides of cloth with uneven cloth width using this device, set the interval between both sewing machines so that the narrowest part of the cloth can be sewn, and when sewing the wide part, leave the excess cloth. Do so that it hangs in the gap between both sewing machines.

[0003]

However, when producing shorts by a method of joining cloth fabrics, the front body and the back body of which are continuous at the crotch portion and shaped on both sides, are joined together,
When the decorative tape is simultaneously sewn to the hem opening portion of the shorts by using the above device before joining both sides, there are the following problems. That is, the sewing of the hem mouth part of the shorts usually starts from the wide sides, but the gap between both sewing machines must be set narrowly according to the crotch part (gusset part) of the shorts. It requires a small amount of work to set the material in the sewing position and start sewing, which causes trouble in handling.

Incidentally, such a problem is not limited to shorts and is common when sewing both sides of a cloth having a non-uniform cloth width. The present invention is proposed in view of the above problems, and an object thereof is to simultaneously sew both side edges of a cloth material whose width is not parallel with a pair of sewing machines, by sewing from a wide portion, It is an object of the present invention to provide a sewing method by a two-head sewing machine and a device therefor, which can solve the problem of a narrow handset at the beginning of setting or sewing and can perform work with advantageous handling for an operator.

[0005]

In order to achieve the above object, the present invention provides a sewing machine movement in which cloth for clothes which is cut into a predetermined shape is supplied to two sewing machines arranged in parallel and driven in synchronization with the rotation of the sewing machine main shaft. The mechanism is characterized in that a stitch row is formed along both side edges of the cloth for clothing while the two sewing machines are brought close to and away from each other.

Further, the shorts material cut into a predetermined shape is supplied to two sewing machines arranged side by side, and at the beginning of sewing, both sides of one end of the wide side edges are sewn apart from the sewing machine, and the width of the material is continued. Sew both side edges of the fabric toward the gusset while gradually bringing the sewing machine closer to each other, and then sew the gusset section with a certain width, and then re-separate the sewing machine to reach both sides of the other end of both sides of the fabric. The feature is to sew.

In this case, it is preferable that the sewing machine is sewn with the sewing machine being moved closer to or separated from the sewing machine according to the number of stitches moved. or,
In a sewing machine in which two rows of stitches are simultaneously formed on a cloth by two sewing machines arranged in parallel, a stepping motor that rotates in synchronization with the rotation of the sewing machine spindle and a sewing machine moving mechanism that is driven by this stepping motor are provided. , In synchronism with the rotation of the sewing machine spindle via the moving mechanism,
By forming the sewing machine rows that are not parallel to each other by moving the sewing machines of the base closer to or further from each other, a machine for calculating the number of stitches of the sewing machine and a sewing machine moving mechanism that is controlled based on the number of stitches are provided. The sewing machine is characterized in that the two sewing machines are brought close to and away from each other to form a non-parallel stitch row in the cloth.

[0008]

With the above construction, when the two sewing machines are in operation, a moving mechanism for moving the sewing machines closer to and further from each other is driven, for example, in synchronization with the rotation of the sewing machine main shaft so that the two sewing machines come close to each other. While separating, shorts fabric cut into a predetermined shape, a series of sewing methods from one end of both sides at the beginning of sewing to the other end of both ends at the end of sewing by sewing the gusset along both edges, It can be achieved reliably.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A sewing method and apparatus using a two-head sewing machine according to the present invention will be described based on the embodiments of the drawings. FIG. 1 shows a sewing device for performing the sewing method of the present invention. The sewing device comprises a right sewing machine 1 and a left sewing machine 2 which are synchronously driven, and the both sewing machines 1 and 2 are placed on the respective tables 3 and 4 and through leg portions 5 and 6. Are connected to each other by a connecting rod 7.

Above the sewing parts of the sewing machines 1 and 2,
A cloth detection sensor 9 for detecting the cloth edge of the cloth to be sewn is provided, and the lower surface of the table 4 is
Auxiliary cloth placing plate 8 slidably extended to the lower surface of the table 3
Is fixed at one end thereof, so that the dough can be held without hanging even if the two tables 3 and 4 are separated from each other.

The table 4 is provided with a long hole 4a so that the sewing machine 2 can be moved in the long hole 4a by a moving mechanism 30 which will be described later. Also, on the bottom surface of the table 4,
The moving mechanism 30 is provided, and the moving mechanism 30 is mainly composed of the ball screw 10 rotated by the stepping motor 16.

The ball screw 10 is rotatably supported at one end by a bearing 11 provided on the lower surface of the table 4 and horizontally supported in the left-right direction, and its screw rod is moved downward from a support plate 12 of the left sewing machine 2. The ball screw hole of the projected bracket 13 is screwed into the bracket 13, and the handle 14 and the gear 15 are fixed to the ends. The stepping motor 16 is fixed to the lower portion of the table 4 and has a drive shaft on which the gear 1 is provided.
6a is fixed, a toothed belt 17 is stretched around the gear 16a and the gear 15 of the ball screw 10, and the ball screw 10 is rotated in synchronization with the rotation of the stepping motor 16. There is.

Further, a sewing machine main shaft (not shown) is provided with a rotation detector 19 which is synchronized with the rotation of the main shaft, and the rotation detector 19 generates a pulse signal of 2 pulses per one rotation to move a hand. It is designed to detect numbers. The stepping motor 16 is driven based on this pulse signal, and when the motor 16 rotates in the CW direction (clockwise when viewed from the left side), the left sewing machine 2 moves leftward on the rail 18 via the ball screw 10. The motor 16 is C
The left sewing machine 2 moves to the right when it rotates in the CW direction (counterclockwise when viewed from the left side).

The rotation direction of the stepping motor 16 is set by a built-in microcomputer (not shown). On the other hand, the left sewing machine 2 is provided with two left and right limit switches 21 and 20 which are spaced from each other on the left and right, and a detector 22 existing between the limit switches 21 and 20 is fixed on the table 4. .

The movement of the left sewing machine 2 causes the detector 22 to move,
The driving of the step motor 16 is stopped by contacting either of the limit switches 20 or 21. In this embodiment, the limit switches 20, 2 are
The interval of 1 is 50 m / m, and the pitch of the ball screw 10 is 2
The step motor 16 that rotates the ball screw 10 at 5 m / m rotates the ball screw 10 once by inputting a pulse signal of 1000 pulses to move the left sewing machine 2 one pitch, that is, 25 m / m. Is made. (However, the above numerical values are not limited.) In the figure, 31 is an operation panel for setting the number of hand movements, etc. with a built-in microcomputer etc., and 25, 26 are left and right sewing machines 1, 2
Each of the sewing machine motors for driving the sewing machine, and 27 and 28 are tape supply portions around which a hem decoration tape is wound.

FIG. 6 shows the configuration of a control system for controlling the stepping motor 16. Although the moving mechanism 30 is provided only on the left sewing machine 2 side in the present embodiment, it may be provided on the right sewing machine 1 so that the sewing machines 1 and 2 move together.
In this case, there is an advantage that the moving stroke of the sewing machine can be halved. Next, the operation of the embodiment configured as described above will be described.

Here, as shown in FIG. 2, the cloth 35 cut into a predetermined shape is supplied to the two sewing machines 1 and 2, and the sewing machines 1 and 2 are moved by the moving mechanism 30 synchronized with the rotation of the main shaft of the sewing machine. A case will be described as an example where the stitches are formed along the cut shape of the cloth 35 by moving the needles while closely moving them apart. The timing of the approach and separation of the sewing machines 1 and 2 is determined by the digital switch DSW1 provided on the operation panel 31,
It is controlled by the number of detection pulses of the rotation detector 19 based on the movement distance L of the sewing machine input to 2 and 3 and the number of needle movements C1 and C2 to a predetermined sewing position. Here, the movement distance L of the sewing machine means the recessed amount (L
/ 2) means the sum. The number C1 of needle movements is the number of needle movements corresponding to the sewing length from the start of sewing until the sewing machine comes closest. Further, the number of stitches C2 is the number of stitches corresponding to the sewing length from the time when the sewing machine starts moving in the approaching direction to the time when the sewing machine starts moving in the separating direction.

Drive control of the stepping motor 16 depends on the contents input to the control unit 40 shown in FIG.
This is performed by a microcomputer (not shown) built in the control unit 40 based on the flowchart shown in FIG. In detail with reference to FIG. 4, first, a predetermined initial adjustment is performed by turning on a start switch (not shown) (S1).

Next, in (S2), it is confirmed whether or not the positions of both the sewing machines 1 and 2 are located at the origin, and if they are not at the origin, the stepping motor 16 is driven by (S3),
The ball screw 10 is rotated to move the left sewing machine 2 to the detection position of the left limit switch 21. In other words, this machine uses the sewing machine 1 and 2 as the origin, based on a state where the sewing machines 1 and 2 are separated to the maximum.

Then, the cut cloth 35 for shorts is set on the sewn portions of the sewing machines 1 and 2 which have returned to the origin together with the decorative tape so as to start sewing from the wide side portions 35a. The set cloth 35 is detected by the cloth detection sensor 9 in (S4). When the presence of the cloth is detected (S5)
Thus, the rotation detector 19 detects whether or not the sewing machine is driven.

If the cloth 35 is present at the sewing position of the sewing machine and the sewing machine is driven, the digital switch D
The set values C1, C2, L input by SW1, 2, 3 are read (S6), and based on these set values, stepping per pulse in the rotation detector 19 is performed in step (S7). The movement amount of the motor 16 is calculated. This calculated value is an important value in order to sew accurately along both side edges of the cloth 35. That is, when the actual movement amount of the stepping motor 16 per pulse in the rotation detector 19 is larger than the calculated value, the cloth 35 is deeply sewn inside and sewn. Since the portion deviated from the cloth 35 is sewn, desired sewing cannot be performed in any case.

When the value calculated in step (S7) is set as the movement amount of the stepping motor 16, then,
A pulse train signal for rotating the stepping motor 16 in the CCW direction (counterclockwise direction) is output from the control unit 40 (S11). Then, sewing is started while moving the left sewing machine 2 to the right with a movement amount based on the above calculated value for each stitch movement of the sewing machine. During sewing, the count in the control unit 40 is decremented by 1 from the set number C1 of stitch movements for each stitch movement, as shown in steps (S12) and (S13). Then, when the subtracted value of the count becomes zero, it is determined that the sewing in the CCW direction is completed, and the process proceeds to step (S14). As a result, the pulse train signal for driving in the CCW direction is stopped.

While the left sewing machine 2 is moving while moving to the right, the cloth 35 is lost at the sewing position of the sewing machine (S8), or the rotation of the sewing machine is stopped (S1).
0) Then, the sewing is immediately finished without further sewing (S9), and the timer waits for 0.5 seconds (S23).
After that, the process is returned to step (S2). Then CCW
When the sewing in the direction is completed and the process proceeds to step (S14), the content of the count is changed to the C2 value, and the sewing is continued until the count value becomes zero (S15). At this time, the left sewing machine 2 does not move in either CCW or CW direction and is stopped, so that the two sewing machines 1 and 2 form parallel stitches. It should be noted that the value of C2 is the number of stitches moved from the start of sewing as described with reference to FIG. 2, so the number of stitches sewn by the processing of steps (S14) and (S15) is C2-C1. Should be.

When the count value becomes zero in step (S15), the process proceeds to (S16) and below, and this time, a pulse train signal for rotating the stepping motor 16 in the CW direction (clockwise direction) is output (S19). By this, 1
Sewing proceeds while the left sewing machine 2 moves leftward for each hand movement. In this case, the number of hand movements while moving the left sewing machine 2 to the left is the number C1 of hand movements while moving the left sewing machine 2 to the right.
Is equal to. This is because the cloth to be sewn has a front-back symmetrical shape as shown in FIG. Therefore, in the case of a cloth that is asymmetrical in the front-rear direction, it can be dealt with by setting a separate number of hands.

Sewing by moving the left sewing machine 2 leftward is advanced until the content of the count becomes zero (S20), (S
21) When it becomes zero, it is determined that all the sewing operations for one fabric 35 are completed, and the process is completed. Even during the sewing operation in the CW direction, the cloth 35 is no longer detected (S16) or the sewing machine stops (S1).
8) Then, the work is forcibly stopped (S17) and 0.5
After a second, the process is returned to step (S2).

By the way, the timing of the operation controlled based on the flowchart in FIG. 4 is as shown in FIG. That is, when the start switch 50 is turned on, the stepping motor 16 drives 51 to return the left sewing machine 2 to the origin, and when the detector 22 of the left sewing machine 2 contacts the left limit switch 21, the left limit switch 21 Is turned ON 52, the CW drive 53 of the stepping motor 16 is stopped, and the left sewing machine 2 is positioned at the origin.

After that, when the cloth detection sensor 9 detects the presence or absence of the cloth 35 and the detection signal 54 of the existence of the cloth is output, the sewing machines 1 and 2 start driving 55 to be in the hand movement state 55a, and at the same time, the stepping motor. 16 counts C in the CCW direction (counterclockwise direction) based on the flow chart.
Drive 56 during 1 and move the left sewing machine 2 to the right. During this time, the sewing from the both side portions 35a of the cloth 35 to the gusset portion 35b is performed.

When the counting of the number of hand movements C1 end 57 is detected by (S13) of the flow chart, the driving of the stepping motor 16 in the CCW direction is stopped 58, and only the hand movement 55a is continued. During this time, the sewing machine is sewing the gusset portion 35b having a narrow width. When the number of hand movements reaches the count C2 and the end of the count C2 is detected by (S15) of the flow chart 59, this time, the stepping motor 16 counts C in the CW direction (counterclockwise direction).
Drive 60 during 1.

During this time, the sewing machine is sewing again toward the wide side portions 35c. The number of hands moved is the same as the flow chart (S
When the end of the count C1 'is detected by 21), the driving of the stepping motor 16 in the CW direction is stopped 6
1. That is, when the left sewing machine 2 moves to the left, the detector 22 comes into contact with the left limit switch 21 and turns it on 62 to stop the output of the pulse signal in the CW direction to the stepping motor 16.

As a result, the sewing machine completes a series of sewing processes, the material detection sensor 9 detects 63 that there is no material, the rotation of the sewing machine stops, and the rotation detection signal becomes OFF64.
As shown on the right side of FIG. 5, when the left sewing machine 2 is moving rightward by the driving 65 of the stepping motor 16 in the CCW direction, the detector 22 contacts the right limit switch 20.
Then, the ON operation 68 is performed and the stepping motor 1 is turned on.
The drive 65 of 6 immediately stops 66.

[0031]

As described above, according to the present invention, when sewing the material cut into a predetermined shape, the two moving machines are moved closer to or separated from each other by the moving mechanism which is synchronized with the rotation of the sewing machine main shaft. Since it can be sewn while sewing, when sewing fabrics for shorts, start sewing from the wide side parts, sew the narrow gusset part, and sew the wide side parts again based on the number of stitches moved. It can be done automatically and an efficient effect can be obtained.

Further, since the sewing is started from the wide portion, the cloth can be set and the sewing can be started in a state where the two sewing machines are separated from each other. This has the effect that work can be performed with advantageous handling.

[Brief description of drawings]

FIG. 1 is an overall front view of a sewing device equipped with the present invention.

FIG. 2 is a development view of a cloth to be sewn by this device.

FIG. 3 is a completed drawing of the dough.

FIG. 4 is a flowchart for controlling the device.

FIG. 5 is a time chart showing the flow of operation.

FIG. 6 is a block diagram showing a configuration of a control unit.

[Explanation of symbols]

 1 Right sewing machine 2 Left sewing machine 16 Stepping motor 30 Moving mechanism

Claims (5)

[Claims] 1. A sewing machine moving mechanism that supplies cloth for clothing that has been cut into a predetermined shape to two sewing machines arranged in parallel, and drives them in synchronization with the rotation of the sewing machine spindle. A sewing method for a garment, characterized in that a row of stitches is formed along both side edges of the cloth for clothing while being separated from each other. 2. A shorts fabric cut into a predetermined shape is supplied to two sewing machines arranged in parallel, and at the beginning of sewing, both sides of one wide edge are sewn apart from the sewing machine, and the fabric width is continued. Sew both side edges of the fabric toward the gusset while gradually bringing the sewing machine closer to each other, and then sew the gusset section with a certain width, and then re-separate the sewing machine to reach both sides of the other end of both sides of the fabric. A method for sewing shorts fabric, which is characterized in that 3. The method for sewing a cloth for shorts according to claim 2, wherein the sewing machine is sewn with the sewing machine moved closer to or separated from the sewing machine according to the number of stitches of the sewing machine. 4. Two cloths are formed by two sewing machines arranged in parallel.
In a sewing device that simultaneously forms a row of seams, a stepping motor that rotates in synchronization with the rotation of a sewing machine spindle and a sewing machine moving mechanism that is driven by this stepping motor are provided, and the sewing machine spindle rotates through the moving mechanism. The sewing machine is characterized in that a non-parallel stitch row is formed on the cloth by moving the two sewing machines close to and away from each other in synchronization with the sewing machine. 5. The fabric is made into two pieces by two sewing machines arranged in parallel.
In a sewing device that simultaneously forms rows of stitches, a sewing machine movement number calculator and a sewing machine movement mechanism controlled based on the number of movements of the sewing machine are provided.
5. The sewing machines of the base are arranged close to and away from each other to form a non-parallel stitch row on the cloth.
The sewing device according to the item.