JP2003326044A - Controlling device of sewing equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make uniform the tension of a belt-shaped object sent into a sewing means, to prevent the enlargement of the size of a sewing machine and further to facilitate maintenance. <P>SOLUTION: Synchronously with the sewing movement of the sewing means 25, a sending-in driving means 27 and a supply driving means 29 are controlled by one control circuit 47. Therefore a sending-in means 26 and a supply drive means 28 can be controlled synchronously with the sewing movement, in correlation with each other. According to this constitution, it is possible to prevent a change in the tension of the belt-shaped object 23 between the sending-in means 26 and the supply means 28 due to the individual operations of the means 26 and 28, to prevent a change in the tension of the belt-shaped object 23 sent into the sewing means 25 due to the change in the tension between the means 26 and 28 and to maintain the tension to be uniform substantially. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for controlling a sewing device for sewing a belt-like material on a cloth.

[0002]

2. Description of the Related Art FIG. 10 is a block diagram showing a controller 1 of a conventional sewing machine. The control device 1 is a device that is provided in a sewing device 2 for sewing a belt-like material on a cloth and controls the sewing device 2. The sewing device 2 includes a sewing machine body 3, a feeding roller 5 for feeding the belt-shaped material into the sewing machine body 3, a feeding motor 6 for driving the feeding roller 5, and a feeding roller 6 for feeding the belt-shaped material wound around a roll. And a supply motor 8 for driving the supply roller 7.

The control device 1 for controlling the sewing device 2 is
It has two control circuits 11 and 12. The sewing machine body 3 also includes a sewing machine rotation signal generator 13. The sewing machine rotation signal generator 13 detects the rotation speed of the drive shaft that drives the sewing machine main body 3 and generates a rotation signal representing the rotation speed. One control circuit 11 drives and controls the feed motor 6 in accordance with the rotation speed of the drive shaft given by a signal from the sewing machine rotation signal generator 13. As a result, the feed roller 5 is rotationally driven by the feed motor 6 in accordance with the rotation speed of the drive shaft, and the belt-like material is supplied to the sewing machine body 3 in accordance with the sewing operation by the sewing machine body 3.

The sewing device 2 is, for example, Japanese Patent No. 3061.
The tension detector 14 shown in FIG. The tension detector 14 detects the tension of the strip between the feed roller 5 and the supply roller 7. The other control circuit 12 drives and controls the supply motor 8 according to the tension given by the signal from the tension detector 14. As a result, the supply roller 7 is rotationally driven by the supply motor 8 in accordance with the tension of the strip, and the strip is supplied to the feed roller 5 in accordance with the tension. In particular,
The other control circuit 12 supplies the belt-shaped material for a set time so that the supply roller 7 supplies the belt-shaped material at a supply speed higher than the feeding speed of the feeding roller 5 from the time when the tension of the belt-shaped material becomes equal to or higher than the set tension. The driving motor 8 is driven. In this way, after forming the slack in the strip between the feed roller 5 and the supply roller 7, the other control circuit 12
The supply motor 8 is stopped, and then the process waits until the tension of the strip becomes equal to or higher than the set tension.

In the sewing device 2, in order to suppress the change in tension of the belt-like material fed to the sewing machine main body 3, in addition to the feeding roller 5 for feeding into the sewing machine main body 3, a feeding roller 7 for feeding out is provided, and individually. Independently controlled by the control circuits 11 and 12, when the tension of the strip between the rollers 5 and 7 becomes equal to or higher than the set tension, it is fed at high speed to loosen the strip between the rollers 5 and 7. , The supply is stopped until the tension reaches the set tension again.

[0006]

SUMMARY OF THE INVENTION In this conventional technique,
As described above, since the lengths of the strips between the rollers 5 and 7 are changed by controlling the rollers 5 and 7 individually and independently, the tension of the strips between the rollers 5 and 7 is changed. Changes. Therefore, the change in the tension of the strip between the rollers 5 and 7 affects the tension of the strip fed to the sewing machine main body 3 to change the tension of the strip, which may result in poor sewing.

Further, since the belt-like material is fed out at a high speed by the supply roller 7, static electricity is generated between the belt-like material and the supply roller 7. If this static electricity is left unattended, the belt-like material will wind around the supply roller 7, so a means for preventing the winding due to this static electricity, such as a container containing water, is required, and the sewing machine becomes large and maintenance is required. Will increase the effort.

It is an object of the present invention to control the sewing machine so that the tension of the belt-like material fed into the sewing machine can be kept substantially constant, the sewing machine can be prevented from becoming large, and the maintenance can be facilitated. Is to provide.

[0009]

According to a first aspect of the present invention, a sewing means, a feeding means for feeding a belt-like material into the sewing means, a feeding drive means for driving the feeding means, and a belt-like material for the feeding means. Is a control device for controlling a sewing machine including a supply means for supplying the supply means and a supply drive means for driving the supply means, and controls the feed drive means and the supply drive means in synchronization with the sewing operation of the sewing means. It is a control device for a sewing machine including a control means.

According to the present invention, the feed drive means and the feed drive means are controlled by one control means in synchronization with the sewing operation of the sewing means, so that the feed means and the supply means are synchronized with the sewing operation. And can be controlled in association with each other. This reduces the change in the tension of the strip between the feeding means and the supply means due to the operation of the feeding means and the supply means separately, and changes the tension of the strip between the sending means and the supply means. do it,
It is possible to reduce the change in the tension of the belt-like material fed to the sewing means and to maintain the tension at a substantially constant value.

Further, it is not necessary to supply the strip-shaped material at a high speed by the supply means, and it is possible to prevent the generation of static electricity due to such high-speed supply and prevent the strip-shaped material from being wrapped around the supply means. Therefore, it is not necessary to separately provide a means for preventing the winding, for example, a container containing water, and it is possible to prevent the sewing device from increasing in size and facilitate maintenance.

According to the second aspect of the present invention, the control means includes the feed drive means and the feed drive means so that the feeding speed of the belt-shaped material by the feeding means is the same as or slightly higher than the feeding speed of the belt-shaped material by the feeding means. In addition to controlling the means, the supply driving means is controlled based on the tension of the strip between the feeding means and the supplying means.

According to the present invention, the feeding drive means and the feeding drive means are controlled so that the feeding speed of the belt-shaped material by the feeding means is the same as or slightly higher than the feeding speed of the belt-shaped material by the feeding means. It is possible to carry out feeding and feeding of the strip by separate means, and then to keep the length of the strip between the feeding means and the feeding means constant. Thereby, the tension of the belt-like material between the feeding means and the supplying means can be kept constant, and the tension of the belt-like material fed into the sewing means is prevented from being changed and fed into the sewing means. It is possible to realize that the tension of the strip is kept constant.

Further, since the supply driving means is controlled on the basis of the tension of the strip between the feeding means and the feeding means, the tension of the strip between the feeding means and the feeding means is caused by some external factor. When the change occurs, the supply drive means is controlled to change the supply speed by the supply means,
The tension of the strip between the feeding means and the feeding means can be corrected. This ensures that the tension of the strip between the feeding means and the supply means can be kept substantially constant.

According to a third aspect of the present invention, the tension detecting means detects the tension of the belt-shaped material between the feeding means and the supplying means, and the control means has a tension detected by the tension detecting means equal to or more than a preset tension. In this case, the supply driving means is controlled so as to increase the supply speed of the strip-shaped material by the supply means.

According to the present invention, when the detected tension between the feeding means and the supplying means becomes equal to or more than the preset tension, the feeding speed of the belt-like material by the supplying means is increased and the supply amount is increased. This makes it possible at least to prevent the tension of the strip between the feeding means and the supply means from becoming too high. In this way, it is possible to realize the correction for keeping the tension of the strip between the feeding means and the supplying means substantially constant.

According to a fourth aspect of the present invention, the feeding means has a feeding state in which the belt is fed to the sewing means, and a passage allowing state in which the feeding of the belt to the sewing means is stopped and the belt is allowed to pass. When the sewing operation by the sewing means is in a predetermined first operation state, the control means sets the feeding means in the passage permitting state, stops the feeding drive means, and supplies the belt-like material by the supply means. When the first control state in which the supply drive means is controlled and the second operation state in which the sewing operation by the sewing means is different from the first operation state are as described above, the feeding means is set to the feeding state and the belt-like material is fed by the feeding means. It is characterized in that the control state is switched to the second control state in which the feeding drive means is controlled.

According to the invention, in accordance with the sewing operation of the sewing means, the feeding means feeds the belt to the sewing means, and the feeding of the belt to the sewing means is stopped and the belt passes. It is switched to the permitted state of passage.
When the sewing operation is in the predetermined first operation state, the control means is set to the first control state, the feeding means is set in the passage permitting state, the feeding drive means is stopped, and the feeding means supplies the belt-like material. When the sewing operation is in the second operation state, the control means is in the second control state, the feeding means is in the feeding state, and the feeding means is driven by the feeding driving means to feed the belt-like material.

By controlling the feeding drive means for driving the feeding means and the feeding drive means for driving the feeding means by one control means, the operating state of the feeding means can be switched according to the sewing operation of the sewing means. Can be controlled. As a result, control for driving the feeding means can be realized as needed, and convenience is improved.

According to a fifth aspect of the present invention, the sewing machine is provided with cutting means for cutting the belt-like material between the sewing means and the feeding means, and the sewing means cooperates with the cutting means to form the belt-like shape. The object is sewn to the cloth while being cut into a predetermined length dimension, and the first operating state of the sewing means is the sewing state in which the belt-like material is sewn to the cloth, and the second operating state of the sewing means is the cloth. It is characterized in that it is in a preparatory state in which the belt-like material is cut and the belt-like material is sewn to the subsequent material after the sewing to the fabric is completed.

According to the present invention, when the sewing operation is the sewing state in which the band-shaped material is sewn on the cloth, the feeding means is set to the passage permitting state, the feeding driving means is stopped, and the feeding means is operated. Is supplied. Further, when the sewing operation is in a preparation state in which the belt-shaped material is cut and the belt-shaped material is sewn to the succeeding material after the sewing to the material is completed, the feeding means is set to the feeding state, and the feeding operation is performed. The means is driven by the feeding drive means to feed the web.

Thus, the feeding means only needs to be able to feed the belt-like material only in the ready state, and it is not necessary to apply tension to the belt-like material fed to the sewing means by the feeding means. Therefore, the feeding drive means does not require a large output torque that can apply tension to the strip by the feeding means, and can be made compact.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing a control device 21 of a sewing device 20 which is an embodiment of the present invention. FIG. 2 is a perspective view showing the sewing device 20. Figure 3
FIG. 6 is a perspective view showing an example of a sewn product by the sewing device 20. The control device 21 is a device that is provided in the sewing device 20 for sewing a belt-like material on the cloth and controls the sewing device 20.

The sewing device 20 is a device provided with a sewing machine main body 25 called, for example, an overlock sewing machine. The sewing machine 20 has a cloth 22 constituting the main body of the shorts shown in FIGS. 3 (1) and 3 (2), and FIG. As shown in FIG. 3, the device is a device for sewing a band-like material 23 which is a band-like elastic cord for giving elasticity to the mouth part and the waist part.

The sewing device 20 includes a main body side structure body 40.
And the supply side structure 41 and the control device 21. The main body side structure 40 includes a sewing machine main body 25 and a sewing machine main body 25.
The feed roller 26 and the feed motor 27 are provided in the vicinity of the. The supply-side structure 41 is a device called an automatic tape feeder or the like, and is provided above the main body-side structure 40 and supported by columns 42. The supply-side structure 41 has a supply roller 28, a supply motor 29, and a reel support 43.

The sewing machine main body 25 serving as a sewing means presses the cloth 22 (shown in FIG. 3; not shown in FIGS. 1 and 2) supported by the substantially horizontal support surface of the cloth support base 30 with the needle plate 31. The needle (not shown) is sandwiched by the gold 32 and is fed in a predetermined feed direction A by a feed dog (not shown).
The fabric 22 can be sewn by reciprocating in the needle driving direction up and down. Further, in the sewing device 20, the belt-shaped material 23 is fed into the sewing machine main body 25 and the belt-shaped material 23 is sewn to the cloth 22.

The feeding roller 26 is the sewing machine main body 25.
Specifically, it is a means for feeding the strip-shaped material into the strip-shaped material supply port 32A of the presser foot 32, and is a means for feeding the pair of roller pieces 3
5,36. Each of the roller pieces 35, 36 is formed such that one roller piece 35 has a larger outer diameter than the other roller piece 36, is rotatably provided around mutually parallel axes, and abuts elastically. It is done and rotates in conjunction.
The belt-like material 23 can be sent by sandwiching and rotating the belt-like material 23 by these roller pieces 35 and 36.

The feed motor 27 is used for the feed roller 2
The feeding drive means for driving 6 is, for example, a stepping motor or the like. The feed motor 27 is provided on one of the roller pieces 35 and 36, in the present embodiment,
One roller piece 35 is rotationally driven. As a result, the other roller piece 36 is also driven and rotated.

The supply roller 28 is a supply means for supplying the belt-like material 23 to the feeding roller 26, and has a pair of roller pieces 38 and 39. The strip 23 is wound around and held by a reel 44 which is rotatably supported by a reel support 43. The supply roller 28 is a belt-shaped material 23.
Is drawn from the reel 44 and supplied to the feed roller 26. The roller pieces 38 and 39 have substantially the same outer diameter, are rotatably provided around mutually parallel axes, are elastically abutted, and rotate in conjunction with each other. These roller pieces 38, 39 can pull out and supply the belt-shaped material 23 by sandwiching and rotating the belt-shaped material 23.

The supply motor 29 is a supply drive means for driving the supply roller 28, and is, for example, a stepping motor or the like. This supply motor 29 is used for each roller piece 3
One of the rollers 8 and 39, in the present embodiment, one roller piece 38 is rotationally driven. As a result, the other roller piece 39 is also driven and rotated.

The control device 21 has a control circuit 47 which is a control means. The control circuit 47 controls the feed motor 27 and the supply motor 29 in synchronization with the sewing operation of the sewing machine body 25. In the present embodiment, the feeding speed of the belt-shaped material 23 by the feeding roller 26 and the feeding speed of the belt-shaped material 23 by the feeding roller 28 are made to coincide with each other, and further in synchronization with the sewing operation, among the feeding speed and the feeding speed, At least the feed speed is equal to the feed speed of the strip 23 sent together with the cloth 22 by the feed tooth in the sewing machine body 25, and the supply speed is equal to or less than the feed speed of the strip 23 sent together with the cloth 22 by the feed tooth in the sewing machine body 25, The feed motor 27 and the feed motor 29 are controlled so as to be the same or slightly higher, preferably coincident with each other. In addition, the control circuit 47
Not only synchronizes with the sewing operation, but also controls the feed motor 27 and the feed motor 29 based on the tension of the strip between the feed roller 26 and the feed roller 28. Specifically, in the present embodiment, when the detected tension detected by the tension detector 51 becomes equal to or higher than a preset set tension, the supply motor increases the supply speed of the belt-shaped material 23 by the supply roller 28. Control 29.

The control circuit 47 includes a central processing unit (CPU), a read only memory (ROM), a random access memory (RAM), a feed motor drive circuit section, a supply motor drive circuit section and the like. The control circuit 47 may be provided in either the main body side constituent body 40 or the supply side constituent body 41,
The main body side structure 40 and the supply side structure 41 may be provided separately. In the present embodiment, for example, the main body side structural body 40 and the supply side structural body 41 are provided separately below the main body side structural body 40.

The sewing machine main body 25 has a sewing machine rotation signal generator 50. In the sewing machine main body 25, a drive force is applied to the drive shaft from a main body drive means such as a motor, and the drive force is transmitted from the drive shaft to the needles, feed dogs, loopers, etc., and these needles, feed teeth, loopers, etc. are driven. . The sewing machine rotation signal generator 50 detects the rotation speed of the drive shaft that drives the sewing machine body 25 in this way, generates a rotation signal Sr representing the rotation speed, and supplies it to the control circuit 47.

The sewing device 20 has a tension detector 51 which is a tension detecting means, which is provided on the supply-side structure 41.
The tension detector 51 detects the tension of the strip 23 between the feeding roller 26 and the supply roller 28. The tension detector 51 has a switch section 52 and an operation piece 53 for switching the switching mode of the switch section 52.

The operation piece 53 is supported so as to be displaceable, specifically, angularly displaceable, and the strip 23 between the feeding roller 26 and the supply roller 28 is wound around. The operation piece 53 is displaced according to the tension of the strip 23 between the feed roller 26 and the supply roller 28, and the feed roller 2
The switch section 52 is operated so as to switch the switching mode depending on whether the tension of the strip 23 between the roller 6 and the supply roller 28 is equal to or higher than a predetermined set tension or is less than the preset tension.

With such a configuration, the tension detector 51
Detects the tension between the feed roller 26 and the supply roller 28, and gives a tension signal Ss representing the detected tension to the control circuit 47.

The control circuit 47 includes a sewing machine rotation signal generator 5
Based on the rotational speed of the drive shaft given by the rotation signal Sr from 0 and the detected tension given by the tension signal Ss from the tension detector 51, a feed drive for instructing the rotation speed of the feed roller 26 to the feed motor 27 by a pulse. Supply roller 2 to signal Sd27 and supply motor 29
Supply drive signal Sd29 for instructing rotation speed of 8 by pulse
give. In this way, the control circuit 47 controls the feed motor 27 and the supply motor 29 in synchronization with the sewing operation.

The sewing device 20 also has a cutting cutter 55 for cutting the belt-like material 23, and the sewing machine main body 25.
Can cooperate with the cutting cutter 55, which is a cutting means, to sew the belt-like material 23 to the cloth while cutting it into a predetermined length dimension. The cutting cutter 55 is provided between the feeding roller 26 and the strip-shaped material supply port 32A of the presser foot 32 in the supply path of the strip 23. Also, the sewing device 20
Has operation input means (not shown). The operation input means can be operated by the operator to input the cutting operation by the cutting cutter 55, and gives the control circuit 47 a signal indicating that the cutting operation has been input. Control circuit 47
When the cutting operation is input, the cutting signal Sc commands the cutting cutter 55 to cut the strip 23.
give. The cutting cutter 55, based on the cutting command,
The strip 23 is cut.

FIG. 4 is a flow chart showing the control operation of the control circuit 47 of the sewing device 20. The control circuit 47
At the same time when the sewing operation by the sewing device 20 is started, the control is started in step a0, and in step a1, whether the drive shaft of the sewing machine main body 25 is rotated based on the rotation signal Sr from the sewing machine rotation signal generator 50. To determine.

When it is determined in step a1 that the drive shaft is rotating, the process proceeds to step a2 and the control circuit 47
Controls the feed motor 27 so as to rotate the feed roller 26 according to the rotation speed of the drive shaft. Specifically, the control circuit 47 controls the feeding motor 27 so that the feeding speed of the belt 23 by the feeding roller 26 matches the feeding speed of the belt 23 in the sewing machine main body 25.
Is controlled, and the control operation proceeds to step a3. In step a3, the control circuit 47 determines whether the detected tension is equal to or higher than the set tension based on the tension signal Ss from the tension detector 51.

When it is determined in step a3 that the detected tension is equal to or higher than the set tension, the control circuit 47 shifts to the operation of step a4. At step a4, the control circuit 47
The feeding motor 28 is controlled so that the feeding speed of the belt-shaped material 23 by the feeding roller 28 is increased by a predetermined set speed to the feeding speed of the belt-shaped material 23 in the sewing machine main body 25, and the feeding roller 26 is controlled. The tension between the supply roller 28 and the supply roller 28 is reduced, and the control operation returns to step a1.

When it is determined in step a1 that the drive shaft is not rotating, the control circuit 47 shifts to the control operation of step a5. At step a5, the control circuit 47 causes the feeding motor 27 to stop the feeding roller 26.
Is controlled and the supply motor 29 is controlled so as to stop the supply roller 28, and the process returns to the control operation of step a1.

When it is determined in step a3 that the detected tension is less than the set tension, the control circuit 47 shifts to the control operation of step a6. At step a6, the control circuit 47
Controls the supply motor 29 so as to rotate the supply roller 28 according to the rotation speed of the drive shaft. In particular,
The control circuit 47 controls the supply motor 29 so that the supply speed of the belt-shaped material 23 by the supply roller 28 matches the feeding speed of the belt-shaped material 23 in the sewing machine main body 25, and returns to the control operation of step a1.

Further, the control circuit 47 causes the cutting cutter 55 to cut the belt-shaped material 23 when the cutting operation is input by the operation inputting means while executing such control.

FIG. 5 is a timing chart showing an example of the operation of the sewing device 20. At time t0, the sewing machine main body 25 is stopped and the tension detected by the tension detector 51 is less than the set tension. This state continues until time t1, the sewing machine main body 25 is driven from time t1 to time t5, and the sewing machine main body 25 is stopped at time t5. From this time t1 to t5, from time t2 to t
In the example up to 3, it is detected that the detected tension is equal to or higher than the set tension.

From time t0 to t1, the sewing machine rotation signal generator 50 supplies the control circuit 47 with the rotation signal Sr indicating that the rotation speed of the drive shaft is 0, and the detected tension is less than the set tension. The tension signal Ss indicating that is given to the control circuit 47. From this time t0 to t
When the drive shaft of the sewing machine main body 25 is stopped and the tension detector 51 detects that the tension is less than the set tension as in the case of No. 1, the control circuit 47 causes the rotation speed to stop the feeding roller 26. Drive signal Sd27
Is supplied to the feed motor 27, and a feed drive signal Sd29 for setting the rotation speed to 0 so as to stop the supply roller 28 is given to the feed motor 29.

From time t1 to t2, the sewing machine rotation signal generator 50 supplies the control circuit 47 with the rotation signal Sr indicating that the rotation speed of the drive shaft is N25, and the detected tension is less than the set tension. The tension signal Ss indicating that is given to the control circuit 47.

When the drive shaft of the sewing machine main body 25 is rotated and the tension detector 51 detects that the tension is less than the set tension from time t1 to time t2, the control circuit 4
Reference numeral 7 denotes a feed drive signal Sd2 representing the rotational speed of the feed roller 26 so that the feed speed of the feed roller 26 and the feed speed of the sewing machine main body 25 match.
7 is fed to the motor 27. As a result, the feed motor 27 operates so that the output shaft rotates at the rotation speed N27 corresponding to the rotation speed represented by the feed drive signal Sd27, and the feed roller 26 causes the feed drive signal Sd2.
It is rotationally driven at the rotational speed represented by 7.

From time t1 to t2, the control circuit 47
Is the supply speed of the supply roller 28 and the sewing machine main body 25.
Feeding roller 2 so that the feeding speed in
The supply drive signal Sd29 representing the rotation speed of 8 is supplied to the supply motor 29. As a result, the supply motor 29 operates so that the output shaft rotates at the rotation speed N291 corresponding to the rotation speed represented by the supply drive signal Sd29, and the supply roller 28 is rotationally driven at the rotation speed represented by the supply drive signal Sd29. .

From time t2 to t3, the sewing machine rotation signal generator 50 supplies the rotation signal Sr indicating that the rotation speed of the drive shaft is N25 to the control circuit 47, and the detected tension is equal to or higher than the set tension. The tension signal Ss indicating that is given to the control circuit 47.

When the drive shaft of the sewing machine main body 25 is rotated and the tension detector 51 detects that the tension is equal to or higher than the set tension from time t2 to time t3, the control circuit 4
Reference numeral 7 denotes a feed drive signal Sd2 representing the rotational speed of the feed roller 26 so that the feed speed of the feed roller 26 and the feed speed of the sewing machine main body 25 match.
7 is fed to the motor 27. As a result, the feed motor 27 operates so that the output shaft rotates at the rotation speed N27 corresponding to the rotation speed represented by the feed drive signal Sd27, and the feed roller 26 causes the feed drive signal Sd2.
It is rotationally driven at the rotational speed represented by 7.

From time t2 to t3, the control circuit 47
In order to reduce the tension of the strip 23 between the feed roller 26 and the supply roller 28,
The supply drive signal S representing the rotation speed obtained by adding a predetermined increase rotation speed to the rotation speed of the supply roller 28 at which the supply speed according to
The d29 is supplied to the supply motor 29. Thereby, the rotation speed N corresponding to the rotation speed represented by the supply drive signal Sd29.
292, therefore, the supply motor 29 operates so that the output shaft rotates at a rotation speed N292 obtained by adding the rotation speed N291 from time t1 to t2 to the rotation speed N292 obtained by adding the increase rotation speed ΔN29 corresponding to the increase rotation speed of the supply roller 28. The roller 28 is rotationally driven at the rotational speed represented by the supply drive signal Sd29.

Time t4 is a time at which a predetermined set time TA elapses after the detected tension has changed from being equal to or more than the set tension to being less than the set tension at time t3. From time t3 to time t4, the sewing machine rotation signal generator 50 provides the control circuit 47 with the rotation signal Sr indicating that the rotation speed of the drive shaft is N25, and also detects that the detected tension is less than the set tension. The tension signal Ss that is represented is given to the control circuit 47.

From time t3 to time t4, the drive shaft of the sewing machine main body 25 is rotated, and the set time T1 is reached after the tension detector 51 changes from above the set tension to below the set tension.
When it is in the state until the time elapses, the control circuit 47 controls the feed speed of the feed roller 26 and the sewing machine main body 25.
The feed drive signal Sd27 representing the rotation speed of the feed roller 26 is applied to the feed motor 27 so that the feed speed in the same manner as in (1) and (2) becomes the same. As a result, the feed motor 27 operates so that the output shaft rotates at the rotation speed N27 corresponding to the rotation speed represented by the feed drive signal Sd27,
The feed roller 26 is rotationally driven at the rotation speed represented by the feed drive signal Sd27.

Further, from time t3 to t4, the control circuit 47
In order to prevent the control state from being complicatedly changed depending on the detection result of the tension detector 51, the supply roller 28
The supply drive signal S representing the rotation speed obtained by adding a predetermined increase rotation speed to the rotation speed of the supply roller 28 at which the supply speed according to
The d29 is supplied to the supply motor 29. Thereby, the rotation speed N corresponding to the rotation speed represented by the supply drive signal Sd29.
The supply motor 29 operates so that the output shaft rotates at 292, and the supply roller 28 is rotationally driven at the rotation speed represented by the supply drive signal Sd29. In this way, it has hysteresis.

From time t4 to t5, the state is the same as that from time t1 to t2, and the same control is performed from time t1 to t2. Further, after time t5, the state is the same as that from time t0 to t1, and the control is performed in the same manner as from time t0 to t1.

In the example of FIG. 5, in order to facilitate understanding,
Although the drive shaft of the sewing machine body 25 is rotated at a constant rotation speed, the same control can be performed even when the drive shaft changes over time.

As described above, the control circuit 47 acquires the rotational speed of the drive shaft and the detected tension between the feed roller 26 and the supply roller 28, and then determines whether the detected tension is equal to or higher than the set tension. . When it is determined that the detected tension is equal to or higher than the set tension, the control circuit 47 causes the feeding roller 2
6 so that the feeding speed of the sewing machine 6 coincides with the feeding speed of the sewing machine body 25, and the feeding speed of the feeding roller 28 is the feeding speed of the sewing machine body 25 increased by a preset speed. 27 and supply motor 28 are controlled to reduce tension.

When it is determined that the detected tension is less than the set tension, the control circuit 47 causes the set time T1 to change after the detected tension changes from the state equal to or more than the set tension to the state less than the set tension.
Is determined. The control device 21 has a timer, and by this timer, it is possible to measure the time after the above-mentioned detected tension changes from a state of being equal to or higher than the set tension to a state of being lower than the set tension. This timer has an infinite initial value at the start of control, is set to be longer than the set time T1, and is reset when the detected tension changes from a state equal to or more than the set tension to a state less than the set tension. .

When it is determined that the set time T1 has elapsed, the control circuit 47 causes the feed speed of the feed roller 26 to match the feed speed of the sewing machine main body 25 and the supply speed of the supply roller 28 to be the same. The feed motor 27 and the supply motor 28 are controlled so as to match the feed speed at. Set time T1
If the control circuit 47 determines that the feeding speed by the feeding roller 26 is not equal to
Feed roller 2 so as to match the feed speed at
The tension is lowered by controlling the feed motor 27 and the feed motor 28 so that the feed speed by 8 is increased by the preset feed speed in the sewing machine main body 25. The control circuit 47 repeatedly executes such a series of control operations.

Control device 2 of sewing device 20 of the present embodiment
According to the first embodiment, the feed motor 27 and the supply motor 29 are controlled by the single control circuit 47 in synchronization with the sewing operation of the sewing machine main body 25.
6 and the supply roller 28 can be controlled in synchronization with the sewing operation in association with each other. This prevents a change in the tension of the belt-like material 23 between the feed roller 26 and the supply roller 28 due to the separate operation of the feed roller 26 and the supply roller 28, and the feed roller 26 and the supply roller 28 are prevented. The tension of the belt-like material 23 between the belt-like material and the belt-like material 23 is sent to the sewing machine main body 25.
It is possible to prevent the tension of the wire from changing and to maintain the tension at a substantially constant value.

Further, as in the prior art, the supply roller 28
Therefore, it is not necessary to supply the belt-shaped material 23 at high speed, and it is possible to prevent the generation of static electricity due to such high-speed supply and prevent the belt-shaped material from being wrapped around the supply means. Therefore, it is not necessary to separately provide a means for preventing the winding, and it is possible to prevent the sewing device 20 from increasing in size and facilitate maintenance.

Further, the belt-like material 23 by the feeding roller 26
The feeding speed of the strip 23 by the feeding roller 28 is
The same as or slightly higher than the feed rate of 2%
Since the feeding motor 27 and the feeding motor 29 are controlled so as to be increased by about 0% or less and the detected tension is also used, the feeding and feeding of the belt-shaped material 23 are performed by separate means. The length of the strip 23 between the feeding means and the feeding means can be kept constant or almost constant. By utilizing the detected tension, the length of the strip 23 between the feeding means and the feeding means can be kept as constant or almost constant as possible.

If the feeding speed is the same as the feeding speed, the length of the strip 23 between the feeding means and the feeding means can be kept constant. As a result, the tension of the belt-shaped material 23 between the feeding roller 26 and the supply roller 28 can be kept constant, and the tension of the belt-shaped material 23 fed into the sewing machine main body 25 can be prevented from being affected, and the sewing machine main body can be prevented. It is possible to realize that the tension of the belt-like material 23 fed into the belt 25 is kept constant. In this case, the control based on the detected tension changes the tension of the belt-shaped material 23 when the tension of the belt-shaped material 23 between the feeding roller 26 and the supply roller 28 changes so as to increase due to some external factor. It can be compensated to ensure that the tension remains constant.

Although it is preferable to match the feeding speed and the feeding speed in this way, even if the feeding speed and the feeding speed are not matched, the feeding speed is set to be slightly higher than the feeding speed, and the feeding speed is determined based on the detected tension. May be changed. With this configuration, the supply motor 29 is controlled based on the tension of the strip 23 between the feed roller 26 and the supply roller 28, so that the strip shape between the feed roller 26 and the supply roller 28 is controlled. When the tension of the object 23 changes, the supply motor 29 is controlled to change the supply speed of the supply roller 28, and the feeding roller 2
It is possible to correct the tension of the strip 23 between the roller 6 and the supply roller 28. Therefore, with a simple structure, the length of the strip 23 between the feeding means and the supplying means can be kept substantially constant.

This configuration is particularly effective when controlling the feeding speed of the feeding roller 26 to be slightly higher than the feeding speed of the feeding roller 28. The tension detector 51 can be realized with a simple structure that only detects whether or not the tension is equal to or more than the set tension.
The tension of the belt-shaped material 23 between the roller 6 and the supply roller 28 can be maintained substantially constant without changing significantly.

FIG. 6 is a block diagram showing a control device 21A of a sewing device 20A according to another embodiment of the present invention. The present embodiment shown in FIG. 6 is similar to the embodiment shown in FIGS. 1 to 5, corresponding portions are denoted by the same reference numerals, only different configurations will be described, and similar configurations will be described. Is omitted.

In the sewing device 20A of the present embodiment, the feeding roller 26 is in a feeding state in which the belt-shaped material 23 can be fed to the sewing machine main body 25, and the feeding of the belt-shaped material 23 to the sewing machine main body 25 is stopped and the belt-shaped material is stopped. It is possible to switch to a passage-permitted state in which the passage of 23 is permitted. Each roller piece 35, 3
6 is switchable between a state in which they abut against each other and a state in which they separate from each other, and a closed state in which each roller piece 35, 36 abuts each other is the feeding state, and each roller piece 35, 36 separates from each other. The open state is the passage permitted state.

Further, in the sewing device 20A, the sewing machine rotation signal 50 may or may not be provided.
In this embodiment, it is not used to control the motors 27 and 29. Further, in the sewing device 20A, the tension detector 51
Detects the tension of the belt-like material 23 between the feeding roller 26 and the supply roller 28 in a stepless manner, and gives a tension signal Ss representing the detected tension to the control circuit 47. The tension detector 51 is provided, for example, so as to be displaceable, and is a combination of an operation member around which the strip 23 is wound and displaced according to the tension of the strip 23, and a position detection sensor for detecting the position of the operation member. It may be configured. Further, in the present embodiment, the supply motor 29 can drive the supply roller 28 to rotate in both forward and reverse directions.

Further, in the sewing device 20A, the control circuit 47
Indicates that the control state is the first control state and the second control state when the sewing operation by the sewing machine main body 25 is in the predetermined first operation state and in the second operation state different from the first operation state. Switch to. When in the first operating state, the control circuit 47 sets the feeding roller 26 in the passing state, stops the feeding motor 27, and controls the feeding motor 29 to feed the strip 23 by the feeding roller 28. When the control circuit 47 is in the second control state,
The feed-in motor 27 is controlled so that the feed-in roller 26 is in the feed-in state and the belt-like material 23 is fed in by the feed-in roller 26.

The first operating state of the sewing machine main body 25 is the cloth 2
2 is a sewing state in which the band-shaped material 23 is sewn. The second operation state of the sewing machine main body 25 is a preparation state in which after the sewing to the cloth 22 is completed, the belt 23 is cut by the cutting cutter 55 to prepare for sewing the belt to the subsequent cloth.

The sewing device 20A according to the present embodiment sends the switching signal Sw representing the command for switching the control state to the control circuit 47.
It has a switching command means 60 for giving to. The switching command means 60 may be configured to give a command for switching the control state to the control circuit 47 based on a manual operation of the operator, or may issue a command for switching the control state according to a preset operation program. However, in the present embodiment, for example, the switching command means 60
Is provided with an input device that is manually operated by an operator, for example, with a foot, and gives a command for switching the control state to the control circuit 47 based on the operation of the input device. This input means executes and stops the sewing operation of the sewing machine main body 25, the cutting operation of the cutting cutter 55, the opening and closing of the feeding roller 26, and the cutting of the belt-shaped material 23. It is possible to input a command such as the execution of the operation of sending to the
Control each means.

As described above, in the present embodiment, the control circuit 4
7 is controlled by switching the control state in synchronization with the operating state of the sewing machine main body 25.

FIG. 7 is a flow chart showing the control operation of the control circuit 47 of the control device 20A. Control circuit 47
Starts the sewing operation by the sewing device 20A, and at the same time, starts the control in step b0 and determines in step b1 whether the operating state of the sewing machine main body 25 is the first operating state or the second state. This determination is made based on a command from the switching command means 60. Specifically, only when the operator operates the input means so as to sew the belt-like material 23 while feeding the cloth 22, the first
It is determined that it is a motion, and if it is a residual motion, it is determined that it is a second motion.

When it is determined in step b1 that the operation is the first operation, the control circuit 47 shifts to step b2 to open the feed roller 26 in order to perform control in the first control state, and in step b3, feed is performed. The motor 27 is stopped and the control operation of step b4 is started. Step b
In 4, the control circuit 47 controls the supply motor 28 based on the detected tension represented by the tension signal Ss from the tension detector 51. Specifically, the control means is the feeding roller 26.
The tension of the strip between the feeding roller 28 and the feeding roller 28 is
The supply motor 28 is controlled so as to rotate the supply roller 28 so as to maintain a preset tension that is suitable for sewing on.

After the operation of step b4, the control circuit 47
In step b5, it is determined whether a control state switching operation has been performed. Specifically, it is determined whether or not a command to stop the sewing operation has been input to the sewing machine main body 25, and thus the operating state of the sewing machine main body 25 has been changed. If the control circuit 47 determines that the switching operation has been performed, the control circuit 47 returns to the control operation of step b1, and if it determines that the switching operation has not been performed, the control circuit 47 returns to the control operation of step b4.

When it is determined in step b1 that the operation is the second operation, the control circuit 47 proceeds to step b6 to control in the second control state, closes the feeding roller 26, and in step b7, the strip-shaped material. The cutting cutter 55 is controlled so as to cut 23. After disconnection, control circuit 47
Shifts to step b8 to rotate the feed motor 27 and shifts to the control operation of step b9. Step b
In 9, the control circuit 47 controls the supply motor 28 based on the detected tension, as in the control operation of step b4.

After the operation of step b9, the control circuit 47
In step b10, it is determined whether or not the re-feeding of the strip 23 after cutting is completed. That is, after the cutting, it is determined whether or not the tip of the strip 23 extending from the supply roller 28 to the winding reel 44 reaches the presser foot 32. The control circuit 47 makes this determination based on the operation of the input means, based on whether or not the re-feeding operation has been stopped. When the control circuit 47 determines that the re-feeding has been completed, the control circuit 47 proceeds to the control operation of step b11. When it determines that the re-feeding has not been completed, the control circuit 47 returns to the control operation of step b8.

When the process moves to step b11, the control circuit 4
7 is a feeding motor 27 and a feeding motor 29 so as to stop the feeding roller 26 and the feeding roller 28.
Control is performed, and the control operation proceeds to step b12. In step b12, the control circuit 47 determines whether or not the control state switching operation has been performed, as in step b5.
If the control circuit 47 determines that the switching operation has been performed, the control circuit 47 returns to the control operation of step b1. If the control circuit 47 determines that the switching operation has not been performed, the control circuit 47 returns to the control operation of step b12.

FIG. 8 is a timing chart showing an example of the operation of the sewing device 20A. At time t0A, the sewing machine main body 25 is in the second operation state, the control circuit 47 is in the second control state, the sewing machine main body 25 is stopped, and the tension detected by the tension detector 51 is less than the set tension. is there. This state continues until time t1A, and time t1A
Then, the operating state of the sewing machine main body 25 is switched to the first operating state, and the control state of the control circuit 47 is switched to the first control state. The sewing machine body 25 is driven from time t1A to time t2A, and the sewing machine body 25 is stopped at time t2A. From time t1A to t2A, the tension detector 51 detects that the tension is equal to or higher than the set tension. Therefore, based on the detected tension, the supply motor 29 is controlled so that the supply roller 28 can be rotated so that the supply speed returns to the set tension. The rotation speed N291A of the output shaft of the supply motor 29 at this time is a speed corresponding to the feed speed in the sewing machine main body.

At time t2A, the operating state of the sewing machine body 25 is switched to the second operating state, and the control state of the control circuit 47 is switched to the second control state. Further, the cutting cutter 55 starts operating at time t2A, and the cutting cutter 55 starts at time t3A.
Operation ends.

In this second operating state, the belt-shaped material 23 is fed again into the sewing machine main body 25 to prepare for the subsequent sewing. From time t3A to time t6A in the second operation state and the second control state, the output shaft of the feed motor 29 rotates at the rotation speed N27A so that the feed roller 26 and the feed roller 26 rotate at a preset constant rotation speed. To drive. At this time, the tension detector 51 detects that the tension is equal to or higher than the set tension. Therefore, based on the detected tension, set the supply speed to return to the set tension,
The supply motor 29 is controlled so that the supply roller 28 can be rotated. Specifically, for example, time t
From 3A to t4A and from time t5A to time t6A, a tension higher than the detected tension from time t1A to time t2A is detected, and in order to restore this tension to the set tension, the supply motor 29 is Rotate the output shaft to N2
The supply roller 28 is driven to rotate by rotating at 92A. Further, since the detected tension becomes a higher tension from time t4A to t5A, the supply motor 29 is
The output shaft is rotated at a rotation speed N293A to rotate the supply roller 28. The second operating state and the second control state are maintained even after the time t6A.

During the period from time t0A to t1A, when the drive shaft is stopped, the tension signal Ss indicating that the detected tension is equal to or more than the set tension is given to the control circuit 47. As from time t0A to time t1A, the drive shaft of the sewing machine main body 25 is in the second control state, the tension detector 51
Is detected to be the set tension, the control circuit 47 gives the feed motor 29 a feed drive signal Sd29 that sets the rotation speed to 0 so as to stop the supply roller 28.

From time t1A to time t2A, as shown by the solid line in FIG. 8, when the drive shaft is rotating at the rotation speed N25A, the tension signal Ss indicating that the detected tension is equal to or higher than the set tension is the control circuit. Given to 47.

From this time t1A to t2A,
In the first control state, when the drive shaft of the sewing machine body 25 is rotated at a constant rotation speed N25 and the tension detector 51 detects that the tension is equal to or higher than the set tension, the control circuit 47
Supplies the supply drive signal Sd29 representing the rotation speed to the supply motor 29 so that the supply roller 28 rotates at the rotation speed at which the detected tension returns to the set tension based on the detected tension.
Give to. As a result, the supply motor 29 operates so that the output shaft rotates at the rotation speed N291A corresponding to the rotation speed represented by the supply drive signal Sd29, and the supply roller 28
Are rotationally driven at the rotational speed represented by the supply drive signal Sd29.

In the present embodiment, the feed roller 26 and the feed motor 27 are stopped during the sewing operation by the sewing machine main body 25, and the supply motor 29 is driven according to the rotational speed of the drive shaft of the sewing machine main body 25. Instead of controlling, the supply motor is controlled based on the detected tension. Even if the rotation speed of the drive shaft changes, as shown by the broken line in FIG. 8, the supply motor is controlled directly based on this change. The motor 29 is not controlled. Of course, when the detected tension changes, for example, as shown by the phantom line in FIG. 8 based on the change in the rotation speed of the drive shaft, the output of the supply motor is also correspondingly changed by the phantom line. The supply motor 29 is controlled so as to change the rotation speed of the shaft.

After the sewing of the belt-like material 23 to the cloth 22 by the sewing machine main body 25 is completed from the time t2A to the time t3A, the control circuit 47 sends the feeding roller 26 and the feeding roller 28 to stop. The cutting cutter 55 is operated by controlling the motor 27 and the supply motor 29.

As from time t3A to t4A, the second
When the belt 23 is in the controlled state and is fed into the sewing machine body 25 and the detected tension is equal to or higher than the set tension, the control circuit 47 causes the feeding speed of the feeding roller 26 to be a predetermined feeding speed. A feed drive signal Sd27 indicating the rotation speed of the feed roller 26 is supplied to the feed motor 27. Accordingly, the rotation speed N2 corresponding to the rotation speed represented by the feed drive signal Sd27.
The feed motor 27 is operated so that the output shaft rotates at 7 A, and the feed roller 26 causes the feed drive signal Sd27.
It is driven to rotate at the rotation speed represented by.

From time t3A to time t4A, the control circuit 47 controls the feeding speed of the feeding roller 28 and the feeding speed of the feeding roller 26 to coincide with each other.
Supply drive signal Sd2 indicating the rotation speed of the supply roller 28
9 is supplied to the supply motor 29. Thereby, the rotation speed N29 corresponding to the rotation speed represented by the supply drive signal Sd29.
The supply motor 29 operates so that the output shaft rotates at 1 A, and the supply roller 28 is rotationally driven at the rotation speed represented by the supply drive signal Sd29.

From this time t4A to t5A,
It is in the second control state, and the belt-like material 23 is attached to the sewing machine main body 25.
When the detected tension is further increased, the control circuit 47 sends the feed drive signal Sd27 representing the rotation speed of the feed roller 26 so that the feed speed by the feed roller 26 becomes a predetermined feed speed. Give to 27. Accordingly, the rotation speed N2 corresponding to the rotation speed represented by the feed drive signal Sd27.
The feed motor 27 is operated so that the output shaft rotates at 7 A, and the feed roller 26 causes the feed drive signal Sd27.
It is driven to rotate at the rotation speed represented by.

From time t4A to time t5A, the control circuit 47 reduces the tension between the feeding roller 26 and the feeding roller 28, so that the feeding speed by the feeding roller 28 and the feeding speed by the feeding roller 26 match. A supply drive signal Sd29 representing a rotation speed obtained by adding a predetermined increase rotation speed to the rotation speed of the supply roller 28.
Is supplied to the supply motor 29. As a result, the rotation speed N293 corresponding to the rotation speed represented by the supply drive signal Sd29.
A, and therefore the rotation speed N2 from time t1 to t2
The supply motor 29 operates so that the output shaft rotates at a rotation speed N292 obtained by adding the increased rotation speed ΔN29A corresponding to the increased rotation speed of the supply roller 28 to 91, and the supply roller 28 represents the supply drive signal Sd29. It is driven to rotate at the rotation speed.

From time t5A to t6A, time t
It is in the same state as from 3A to t4A, and is controlled in the same manner as from time t3A to t4A. Further, after time t6A, the state is the same as that from time t0A to t1A, and the control is performed in the same manner as from time t0A to t1A.

As described above, the control circuit 47 determines whether the control state is the first control state or the second control state. When it is determined to be in the first control state, it is determined whether or not the detected tension is equal to or higher than the set tension, and whether or not the sewing of the belt-shaped material 23 to the cloth 22 by the sewing machine main body 25 is completed.

When it is determined to be in the first control state, the control circuit 47 causes the feed motor 27 and the cutting cutter 5 to operate.
Stop 5 Further, the first control state, the control circuit 47 controls the supply motor 28 to supply the belt-shaped material 23 based on the detected tension so that the supply speed by the supply roller 28 becomes the set tension.

When the second control state is determined, the cutting cutter 55 is operated in accordance with the input from the input means, or the belt-like material 23 is re-fed by the feeding roller 26 and the supply roller 28. At this time, the control circuit 47
Supplies the strip 23 by controlling the supply motor 28 so that the supply speed of the supply roller 28 becomes the set tension on the basis of the detected tension. Control circuit 47
Repeatedly executes such a series of control operations.

According to the control device 21A of the sewing device 20A of the present embodiment, the feeding motor 27 and the supply motor 29 are synchronized with the sewing operation of the sewing machine main body 25, similarly to the control device 21A of the sewing device 20. One control circuit 47
Since it is controlled by the feeding roller 26 and the feeding roller 28, the feeding roller 26 and the feeding roller 28 can be controlled in association with each other in synchronization with the sewing operation. This prevents a change in the tension of the belt-like material 23 between the feed roller 26 and the feed roller 28 due to the feed roller 26 and the feed roller 28 operating individually.
It is possible to prevent the tension of the belt-like material 23 between the feeding roller 28 and the supply roller 28 from changing and change the tension of the belt-like material 23 fed into the sewing machine main body 25, and it is possible to keep the tension constant.

Further, as in the prior art, the supply roller 28
Therefore, it is not necessary to supply the belt-shaped material 23 at high speed, and the operation is not necessary. It is possible to prevent the generation of static electricity due to such high-speed supply and prevent the belt-shaped material from being wrapped around the supply means. Therefore, it is not necessary to separately provide a means for preventing the winding, and it is possible to prevent the sewing machine from increasing in size and facilitate maintenance.

Further, in the second control state, the feeding speed of the belt-shaped material 23 by the feeding roller 26 is the same as or slightly higher than the feeding speed of the belt-shaped material 23 by the feeding roller 28, for example, more than 0% and 20% or less higher. Since the feeding motor 27 and the feeding motor 29 are controlled by using the detected tension together, the feeding and feeding of the belt-like material 23 are performed after the feeding and feeding of the belt-shaped material 23 are performed by separate means. The length of the strip 23 between the means can be kept constant or almost constant. By utilizing the detected tension, the length of the strip 23 between the feeding means and the feeding means can be kept as constant or almost constant as possible.

When the feeding speed is the same as the feeding speed, the length of the strip 23 between the feeding means and the feeding means can be kept constant. As a result, the tension of the strip 23 of the strip 23 between the feed roller 26 and the supply roller 28 can be kept constant, and the sewing machine main body 25
It is possible to prevent the tension of the belt-like material 23 fed to the sewing machine from being affected and to keep the tension of the belt-like material 23 fed to the sewing machine main body 25 constant. In this case, the control based on the detected tension changes the tension of the belt-shaped material 23 when the tension of the belt-shaped material 23 between the feeding roller 26 and the supply roller 28 changes so as to increase due to some external factor. It can be compensated to ensure that the tension remains constant.

It is preferable to match the feed rate and the feed rate in this way, but even if they do not match, the feed rate is set to be slightly higher than the feed rate, and the feed rate is based on the detected tension. May be changed. With this configuration, the supply motor 29 is controlled based on the tension of the strip 23 between the feed roller 26 and the supply roller 28, so that the strip shape between the feed roller 26 and the supply roller 28 is controlled. When the tension of the object 23 changes, the supply motor 29 is controlled to change the supply speed of the supply roller 28, and the feeding roller 2
It is possible to correct the tension of the strip 23 between the roller 6 and the supply roller 28. Therefore, with a simple structure, the length of the strip 23 between the feeding means and the supplying means can be kept substantially constant.

This structure is particularly effective when controlling the feeding speed of the feeding roller 26 to be slightly higher than the feeding speed of the feeding roller 28. The tension detector 51 can be realized with a simple structure that only detects whether or not the tension is equal to or more than the set tension.
The tension of the belt-shaped material 23 between the roller 6 and the supply roller 28 can be maintained substantially constant without changing significantly.

Further, in accordance with the sewing operation of the sewing machine main body 25, the feeding roller 26, the belt-like material 23 and the sewing machine main body 2 are sewn.
5 and the state of feeding the sewing machine body 25 of the belt-like material 23
It is switched to a passage permitting state in which the feeding to the belt is stopped and the passage of the belt-like material 23 is permitted. When the sewing machine main body 25 is in the first operation state, the control circuit 47 is set to the first control state, the feed roller 26 is set in the passage permitting state, the feed motor 27 is stopped, and the supply roller 28 is set.
The strip 23 is supplied by. The sewing operation is the second
In the operating state, the control circuit 47 is set to the second control state, the feeding roller 26 is set to the feeding state, the feeding roller 26 is driven by the feeding motor 27, and the strip 23 is fed.

A feeding motor 27 for driving the feeding roller 26 and a feeding motor 2 for driving the feeding roller 28.
By controlling 9 and 9 by one control circuit 47, the feeding roller 26 can be operated in accordance with the sewing operation of the sewing machine main body 25.
It is possible to control so as to switch the operating state of.
As a result, control for driving the feeding roller 26 can be realized as needed, and convenience is improved.

Further, the sewing operation is performed on the cloth 22 by the strip 2
3 is sewn on, the feeding roller 26
Is allowed to pass, the feeding motor 27 is stopped, and the belt-like material 23 is supplied by the supply roller 28. In addition, after the sewing operation to the fabric 22 is completed, the strip 23 is cut and the strip 23 is attached to the subsequent fabric 22.
In the state of preparation for sewing on, the feed roller 26 is put into the feed state, and the feed roller 2
6 is driven by the feeding motor 27, and the strip 2
3 is sent.

As a result, it is sufficient for the feed roller 26 to feed the belt-like material 23 only in the ready state.
It is not necessary to apply tension to the strip 23 fed into the.
Therefore, the feeding motor 27 is operated by the feeding roller 26.
Thus, it is possible to reduce the size without requiring a large output torque that can apply tension to the belt-like material 23.

FIG. 9 is a perspective view showing a part of a sewing device 20B according to still another embodiment of the present invention. The present embodiment shown in FIG. 9 is similar to the embodiment shown in FIGS. 1 to 8, corresponding parts are denoted by the same reference numerals, only different configurations will be described, and similar configurations will be described. Is omitted. In the above-described embodiment, the sewing machine main body 25 of the sewing device 20, 20A is a main body called an overlock sewing machine, but in the present embodiment, the sewing machine main body 2 is used.
As 5, the flat stitch sewing machine (however, the needle is not shown) is used to sew the belt-shaped decorative tape 23 to the cloth 22. Detailed description of each part is omitted. Even with such a sewing device 20B, the same effect can be obtained by controlling in the same manner as in the above-described respective embodiments.

The above-described embodiment is merely an example of the present invention, and the configuration can be changed within the scope of the present invention.

[0108]

According to the present invention, the feed drive means and the supply drive means are controlled by one control means in synchronization with the sewing operation of the sewing means.
The feeding means and the supplying means can be controlled in synchronization with each other and associated with each other. This prevents the tension of the strip between the feeding means and the supply means from changing due to the separate operation of the feeding means and the supply means, and changes the tension of the strip between the feeding means and the supply means. As a result, it is possible to prevent the tension of the belt-like material fed to the sewing means from changing and to keep the tension constant.

Further, it is not necessary to supply the strip-shaped material at a high speed by the supply means, and it is possible to prevent the generation of static electricity due to such high-speed supply and prevent the strip-shaped material from being wrapped around the supply means. Therefore, it is not necessary to separately provide a means for preventing the winding, for example, a container containing water, and it is possible to prevent the sewing device from increasing in size and facilitate maintenance.

According to the second aspect of the present invention, the feeding speed of the belt-shaped material by the feeding means is the same as or slightly higher than the feeding speed of the belt-shaped material by the feeding means.
Since the feeding driving means and the feeding driving means are controlled, the feeding and feeding of the strip are performed by separate means, and the length of the strip between the feeding means and the feeding means is kept substantially constant. You can This makes it possible to keep the tension of the strip between the feeding means and the supply means substantially constant, prevent the tension of the strip fed to the sewing means from being affected, and feed the strip to the sewing means. It is possible to realize that the tension of C is kept constant.

Furthermore, since the supply driving means is controlled based on the tension of the strip between the feeding means and the supply means, the tension of the strip between the feeding means and the supply means is controlled by some external factor. When the change occurs, the supply drive means is controlled to change the supply speed by the supply means,
The tension of the strip between the feeding means and the feeding means can be corrected. This ensures that the tension of the strip between the feeding means and the supply means is kept constant.

According to the third aspect of the present invention, when the detected tension between the feeding means and the supplying means becomes equal to or more than the predetermined set tension, the feeding speed of the belt-like material by the feeding means is increased and the feeding amount is increased. Will be increased. This makes it possible at least to prevent the tension of the strip between the feeding means and the supply means from becoming too high. In this way, it is possible to realize the correction for keeping the tension of the belt-like material between the feeding means and the supplying means constant.

According to the fourth aspect of the present invention, in accordance with the sewing operation of the sewing means, the feeding means stops feeding the belt-shaped material to the sewing means and the feeding of the belt-shaped material to the sewing means. It is switched to a passage permitting state that permits passage of the band-shaped material. When the sewing operation is in the predetermined first operation state, the control means is set to the first control state, the feeding means is set in the passage permitting state, the feeding drive means is stopped, and the feeding means supplies the belt-like material. When the sewing operation is in the second operation state, the control means is in the second control state, the feeding means is in the feeding state, and the feeding means is driven by the feeding driving means,
A band is sent.

By controlling the feeding drive means for driving the feeding means and the feeding drive means for driving the feeding means by one control means, the operating state of the feeding means can be switched according to the sewing operation of the sewing means. Can be controlled. As a result, control for driving the feeding means can be realized as needed, and convenience is improved.

According to the fifth aspect of the present invention, when the sewing operation is the sewing state in which the belt-like material is sewn on the cloth, the feeding means is set in the passage permitting state and the feeding drive means is stopped. The strip is supplied by the supply means. Further, when the sewing operation is in a preparation state in which the belt-shaped material is cut and the belt-shaped material is sewn to the succeeding material after the sewing to the material is completed, the feeding means is set to the feeding state, and the feeding operation is performed. The means is driven by the feeding drive means to feed the web.

Thus, the feeding means only needs to be able to feed the belt-shaped material only in the ready state, and it is not necessary to apply tension to the belt-shaped material fed to the sewing means by the feeding means. Therefore, the feeding drive means does not require a large output torque that can apply tension to the strip by the feeding means, and can be made compact.

[Brief description of drawings]

FIG. 1 is a block diagram showing a control device 21 of a sewing device 20 according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a sewing device 20.

FIG. 3 is a perspective view showing an example of a sewing product by the sewing device 20.

FIG. 4 is a flowchart showing a control operation of a control circuit 47 of the sewing device 20.

FIG. 5 is a timing chart showing an example of the operation of the sewing device 20.

FIG. 6 is a sewing device 20A according to another embodiment of the present invention.
2 is a block diagram showing a control device 21A of FIG.

FIG. 7 is a flowchart showing a control operation of a control circuit 47 of the sewing device 20A.

FIG. 8 is a timing chart showing an example of the operation of the sewing device 20A.

FIG. 9 is a sewing device 20 according to still another embodiment of the present invention.
It is a perspective view which shows a part of B.

FIG. 10 is a block diagram showing a control device 1 of a conventional sewing machine.

[Explanation of symbols]

20,20A, 20B sewing machine 21,21A control device 22 fabric 23 Band 25 sewing machine body 26 Feeding roller 27 Feed motor 28 Supply roller 29 Supply motor 50 sewing machine rotation signal generator 51 Tension detector 55 cutting cutter

Claims (5)

[Claims] 1. A sewing means, a feeding means for feeding a belt-like material into the sewing means, a feeding drive means for driving the feeding means, a feeding means for feeding the belt-like material to the feeding means, and a feeding means. A control device for controlling a sewing machine including a supply drive means for controlling the sewing machine, the control device including a control means for controlling the feed drive means and the supply drive means in synchronization with the sewing operation of the sewing means. apparatus. 2. The control means controls the feeding drive means and the feeding drive means so that the feeding speed of the belt-shaped material by the feeding means is the same as or slightly higher than the feeding speed of the belt-shaped material by the feeding means, and the feeding means. 2. The control device for the sewing device according to claim 1, wherein the supply drive means is controlled based on the tension of the strip between the supply means and the supply means. 3. A tension detecting means for detecting the tension of the belt-shaped material between the feeding means and the feeding means, wherein the control means has a belt-like shape by the feeding means when the tension detected by the tension detecting means is equal to or higher than a preset tension. The control device for the sewing device according to claim 2, wherein the supply drive means is controlled so as to increase the supply speed of the product. 4. The feeding means is switchable between a feeding state in which the belt-like material is fed to the sewing means and a passage allowing state in which the feeding of the belt-like material to the sewing means is stopped and the belt-like material is allowed to pass, and the control is performed. The means is the first sewing operation that is predetermined by the sewing means.
A first control means for setting the feeding means into the passage permitting state, stopping the feeding driving means, and controlling the feeding driving means so as to feed the belt-like material by the feeding means when in the operating state;
A second control for controlling the feeding drive means so that the feeding means is in the feeding state when the control state and the sewing operation by the sewing means is in the second operating state different from the first operating state. In the state,
2. The control device for the sewing device according to claim 1, wherein the control state is switched. 5. The sewing machine is provided with a cutting means for cutting the belt-like material between the sewing means and the feeding means, and the sewing means cooperates with the cutting means to make the belt-like material a predetermined length dimension. The first operation state of the sewing means is a sewing state in which a band is sewn to the cloth, and the second operation state of the sewing means ends sewing to the cloth. 5. The control device for the sewing device according to claim 4, wherein the control device is in a preparation state in which the belt-shaped material is cut afterward and the belt-shaped material is ready to be sewn to the subsequent material.