JP2000317183A - Control device for sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control device of a sewing machine capable of maintaining the temperature of a heating element in a proper condition for cutting a thread at the time of cutting the thread and controlling the thread cutting operation always properly. SOLUTION: This control device has a thread information input means 45 for inputting information about a sewing thread, a thread cutting condition memory means for storing conditions for cutting a thread, and a thread cutting condition determining means 48 for determining a thread cutting condition among those stored in the thread cutting condition memory means 47 based on the thread information inputted by the thread information input means 45. The device also has a control means 50 for cutting the thread based on the thread cutting condition determined by the thread cutting condition determining means 48.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing machine control device suitable for a sewing machine provided with a thread cutting device for cutting a sewing thread by contacting a heating element which generates heat by electric current.

[0002]

2. Description of the Related Art Conventionally, sewing machines, especially industrial sewing machines, and the like are provided with a thread trimming device capable of automatically cutting a sewing thread for reasons such as improvement in sewing efficiency. The upper thread and the lower thread, which are sewing threads, can be automatically cut at the same time.

[0003] As such a thread cutting device, for example,
It is known that a moving knife and a fixed knife are provided on the back surface of the needle plate, and the sewing thread is trimmed with the moving knife, and the sewing thread is cut between the moving knife and the fixed knife to cut the sewing thread.

However, in such a thread cutting device, for example, when cutting a twisted yarn consisting of a plurality of single yarns, each single yarn is separated from the cut portion, and the appearance of the cut portion of the yarn becomes poor. There was a defect. In addition, there is also a problem in that cutting a specially coated yarn slows down the scalpel and causes poor thread cutting.

In order to solve such a problem, a thread cutting device has been proposed in which a heating element which generates heat by passing an electric current is brought into contact with a sewing thread to cut (cut) the thread.

FIGS. 3 to 5 show an example of a conventional sewing machine provided with a thread cutting device using a heating element.
As shown in FIG. 1, the thread trimming device 2 of the sewing machine 1 includes a heating element 5 which is arranged near the needle hole 4 on the back surface of the needle plate 3 and generates heat by passing an electric current, and a sewing thread 6 to be cut (fused) (see FIG. And 4) a capturing member 7 for capturing and urging the heating element 5 to come into contact therewith. Then, at the end of sewing of the sewing machine 1, the catching member 7 is rotated by a thread cutting solenoid 21 (FIG. 6) as a driving means, so that the sewing thread to be cut by the catching member 7 as shown in FIGS. 6, the upper thread 6a and the lower thread 6b are captured and brought into contact with the heating element 5,
The upper thread 6a and the lower thread 6b are melted at the same time. More specifically, the thread cutting solenoid 21 is turned on by a needle down signal from a needle position detector 28 (FIG. 6) after a predetermined sewing operation, and is turned off by a needle up signal thereafter.
Is done.

Further, in the sewing machine 1 provided with such a thread trimming device 2, the sewing thread 6 is not used except when the thread trimming is performed.
In order to prevent the sewing thread 6 during sewing from being cut by contact with the heating element 5, the heating element 5 is heated only at the time of thread cutting, and the heat of the heating element 5 is dissipated before the heat is radiated to the surroundings other than the heating element 5. In order to generate heat, a control device 10 that controls the heating element 5 to heat for a certain time by instantaneously applying a large current to the heating element 5 is used. That is, as shown in FIG.
The control device 10 is connected to a power supply 17 by controlling the operation of a switch unit 16 configured by a relay or the like by a CPU board 15 mounted with a CPU 12, a memory 13, a control circuit 14, and the like connected to a control panel 11. The energization control is performed by controlling the energization time (continuous energization signal for a predetermined time) or energization duty (switching signal time for a fixed time) of the current supplied to the heating element 5 after setting the voltage to a predetermined value by the heater transformer 19. Is formed. Also, the control panel 11
Is connected to a volume or a switch as an energization time setting means 20 for setting an energization time of a current supplied to the heating element 5. A thread cutting solenoid 21 for driving the capturing member 7 is connected to the CPU board 15. Is connected.

Therefore, at the time of thread trimming, generally,
By controlling the duration of the current supplied to the heating element 5, the temperature of the heating element 5 is controlled to exceed the settable temperature for a short time, ie, the thread fusing possible temperature required for fusing the sewing thread 6. It has become.

[0009] Further, the sewing machine 1 is known to include a thread removing device. This thread removing device is for pulling out the upper thread 6a from the sewn material after thread cutting so that sewing can be performed efficiently. As shown in FIGS. The upper thread 6a is sewn after thread trimming by rotating a thread wiper member 26 movably disposed along a thread wiper solenoid 27 (FIG. 6) serving as a driving means connected to the CPU board 15 so as to rotate. It is designed to be pulled out of an object (FIG. 8).

That is, as shown in FIG. 9, just before the sewing is completed and the upper shaft of the sewing machine 1 stops, the thread cutting solenoid 21 is driven to bring the sewing thread 6 into contact with the heating element 5. Then, at the timing when the upper shaft stops and the sewing is completed, a heating command to the heating element 5 is sent out, the current supply to the heating element 5 is executed for a predetermined time T1 ms, the sewing thread 6 is melted, and the thread cutting operation is performed. finish. Further, after a predetermined time T2 ms elapses after the end of the heating command to the heating element 5, the thread removing solenoid 27 is driven to pull out the upper thread 6a from the sewing product after thread trimming.

[0011]

However, in the conventional control device 10 described above, the energizing time setting means 20 constituted by a volume or a switch is manually operated to supply the heat to the heating element 5 at the time of thread cutting. The current supply time of the supplied current is controlled,
There has been a problem that it is difficult to always properly control the thread cutting conditions (energization time) with respect to various kinds of yarn 6 materials and yarn counts (thread thickness).

When using the thread removing device 25,
The start timing (start timing) of the thread removing operation becomes important. That is, since the time T2, which is the operation start timing (thread-wiping operation start timing) of the thread-wiping device 25 with respect to the power-supply timing to the heating element 5 (electric-flow timing), is fixed, If the current supply time of the current supplied to the heating element 5 is changed, and the start timing of the thread-wiping operation is too early, the thread-wiping operation is started before the sewing thread 6 is melted. Therefore, as shown in FIG. The fusing portion (cutting portion) of No. 6 is separated. Also,
If the start timing of the thread sweeping operation is too late, the sewing thread 6 melts, but before the sewing thread 6 is removed, the fusing section (cut section) of the sewing thread 6
Is cooled and becomes hump-shaped and hardens, and the upper thread 6a
Is not pulled out onto the sewn material and is not drawn out, resulting in inconveniences such as poor thread removal and welding of the cut upper and lower threads 6a and 6b.

Therefore, in the sewing machine 1 in which the thread removing device 25 is provided in the conventional thread cutting device 2, a wide variety of threads 6
There is a problem that it is difficult to always properly control the thread-wiping operation start timing (operation start timing: thread-wiping condition) with respect to the material and the yarn thickness (yarn count).

The present invention has been made in view of these points, and can maintain the temperature of a heating element at the time of thread cutting in a state appropriate for cutting a sewing thread, and always appropriately control a thread removing operation. It is an object of the present invention to provide a control device for a sewing machine that can perform the operation.

[0015]

According to a first aspect of the present invention, there is provided a sewing machine control device according to the first aspect of the present invention, comprising: thread information input means for inputting information on a sewing thread; Thread trimming condition storage means for storing thread trimming conditions, and thread trimming condition determining means for determining thread trimming conditions from thread trimming conditions stored in the thread trimming condition storage means based on thread information input by the thread information input means And a control means for performing thread trimming based on the thread trimming condition determined by the thread trimming condition determining means.

By adopting such a configuration, when thread information is input by the thread information input means, the thread trimming condition determining means responds to the thread information from the thread trimming conditions stored in the thread trimming condition storing means. The thread trimming condition is automatically determined, and the control means can automatically control the current supplied to the heating element based on the thread trimming condition determined by the thread trimming condition determining means at the time of thread trimming. In addition, the temperature of the heating element at the time of thread trimming can be maintained in a state appropriate for cutting the sewing thread.

According to a second aspect of the present invention, there is provided a sewing machine control device according to the first aspect, wherein the thread information input means specifies at least one of a material and a thickness of the sewing thread. The point is to input or select information.

By employing such a configuration, the temperature of the heating element at the time of thread cutting can be easily and appropriately controlled according to at least one of the material and the thickness (thread count) of the sewing thread.

A third aspect of the present invention is a sewing machine control device according to the first or second aspect, wherein the thread trimming condition is such that the current supply time to the heating element is controlled by the current supply time. And a set value for determining at least one of the energization duty.

By adopting such a configuration, the temperature of the heating element at the time of thread cutting can be maintained at an appropriate state by cutting the sewing thread.

According to a fourth aspect of the present invention, there is provided a sewing machine control device according to any one of the first to third aspects, wherein the thread trimming condition for setting the thread trimming condition is provided. The point is that setting means is provided.

By adopting such a configuration, correction of the set value stored in the thread trimming condition storage means and storage of a new set value in the thread trimming condition storage means can be easily performed. Further, the temperature of the heating element at the time of thread trimming can be maintained in a more appropriate state by cutting the sewing thread.

According to a fifth aspect of the present invention, there is provided a sewing machine control device according to any one of the first to fourth aspects, wherein the sewing machine cuts the upper thread after thread trimming. A thread wiping device for pulling out from a sewing product is provided, and the thread trimming condition has information for determining an operation start time of the thread wiping device with respect to a power supply time to the heating element.

By adopting such a configuration, the thread-wiping operation can be executed at an optimum time.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments shown in the drawings. Note that the same or corresponding components as those of the above-described conventional device are denoted by the same reference numerals in the drawings, and description thereof is omitted.

FIG. 1 is a block diagram showing a main part of an embodiment of a control device for a sewing machine according to the present invention.

As shown in FIG. 1, the sewing machine 3 of this embodiment
The one control device 32 has a heater transformer 19 connected to the heating element 5 and capable of supplying a current set to the heating element 5, for example, several tens of amperes. This heater transformer 1
Numeral 9 is connected to a power supply 17 to supply a heating power supply, and a switch section 16 constituted by a relay or the like controls the power supply time to the heating element 5. The switch unit 16 includes a CPU 34, a memory 35
And a CPU board 37 on which a control circuit 36 and the like are mounted, and controls energization to the heating element 5 in accordance with a heating command (control designation) sent from the CPU board 37. Further, on the CPU board 37,
A thread cutting solenoid 21 for driving the catching member 7, a thread removing solenoid 27 for driving the thread removing member 26, and the like are connected. The CPU board 37 is connected to a control panel 39. The control panel 39 has a thread material input means 41 such as a ten key for inputting or selecting a material of the sewing thread 6, and a thread count which is the thickness of the sewing thread 6. A thread count input means 42 including a numeric keypad for inputting or selecting, and a thread cutting condition setting means 43 including a numeric keypad for setting thread cutting conditions are connected.

The thread material input means 41 and the thread count input means 42 constitute a thread information input means 45 for inputting information on the sewing thread 6 of the present embodiment.

The thread cutting condition setting means 4 in this embodiment
Reference numeral 3 is used for correcting and newly setting the energizing time and energizing duty to be supplied to the heating element 5 at the time of thread trimming, which is the thread trimming condition, and the operation start timing T2 of the thread removing device 25, as described later. .

The memory 35 has at least a threading time T1 corresponding to the thread material and the thread count as the thread information input by the thread information input means 45 comprising at least the thread material input means 41 and the thread count input means 42; Operation start timing of the yarn removing device 25 with respect to the energizing duty and the timing of energizing the heating element 5 (starting operation of the yarn removing operation).
Operation start timing T of the thread removing solenoid 27
2 is stored as a timing table, and the current supply control to the heating element 5 based on the yarn material and the yarn count as the yarn information input by the yarn information input means 45 and the operation of the yarn wiping device 25 are started. A control program for controlling the CPU 34 to control the timing is stored.

That is, the memory 35 has a function as a thread trimming condition storage means 47 for storing thread trimming conditions, and the CPU 34 controls the thread trimming condition based on the thread information input by the thread information inputting means 45. It has a function as a thread trimming condition determining means 48 for automatically determining the thread trimming condition from the thread trimming condition stored in the storage means 47.

The CPU board 37, the control panel 39, the thread information inputting means 45 comprising the thread material inputting means 41 and the thread count inputting means 42, and the thread cutting condition setting means 43 provide the thread cutting condition determining means of this embodiment. Control means 50 for performing thread trimming and thread wiping based on the thread trimming conditions determined by 48 is configured.

The thread trimming condition determined based on the information of the sewing thread 6 input or selected by the thread information input means 45 for inputting the information of the sewing thread 6 may be displayed on the control panel 39.

Next, the operation of the present embodiment having the above-described configuration will be described.

The operation of controlling the energization of the heating element 5 by the control device 32 of the sewing machine 31 of this embodiment is performed by the thread information input means 4.
Yarn material input means 41 and yarn count input means 4 as 5
2 is started by inputting or setting the material and thread count (thickness) of the sewing thread 6 used for sewing by operating the sewing machine 2.
Then, the yarn material input means 41 and the yarn count input means 42
Is operated to input or set the material and thread count of the sewing thread 6, input data corresponding to the thread material and thread count are input from the control panel 39 to the CPU 34 of the CPU board 37 which also serves as the thread cutting condition determining means 49. . Then, the CPU 34 sets the optimum energizing time and energizing duty to the heating element 5 for the yarn material and yarn count inputted based on the control program, and the yarn removing device 25, more specifically, the yarn removing solenoid 27 for driving the thread removing member 26. The time T2 from the end of the current supply to the heating element 5, which is the operation start timing (operation start timing), is stored in advance in the memory 35.
From the timing table stored in the. That is, the CPU 34 sets the energization time, the energization duty, and the yarn removal operation timing, which are the set values for determining the thread trimming conditions of the present embodiment, based on the yarn material and yarn count input by the yarn information input means 45. Also functions as thread trimming condition determining means 48 for automatically determining the three. FIG. 2 shows an example of this timing table.

By operating the thread trimming condition setting means 43, it is easy to correct or newly set the timing table set value stored in the memory 35 functioning as the thread trimming condition storing means 47.

As described above, according to the control device 32 of the sewing machine of this embodiment, when the thread information is inputted by the thread information input means 45, the thread cutting condition determining means 43 is stored in the thread cutting condition storing means 47. The thread trimming condition according to the thread information is automatically determined from the thread trimming condition, and the control means 50 supplies the heating element 5 based on the thread trimming condition determined by the thread trimming condition determining means 48 at the time of the thread trimming. Since the current and the operation start timing of the thread removing device 25 can be easily controlled, the temperature of the heating element 5 at the time of thread cutting can be maintained in a state appropriate for cutting the sewing thread 6 and the thread removing device 25 can be maintained. , The start timing (operation start timing: thread removal condition) of the thread removal operation can always be appropriately and easily controlled.

Further, the controller 3 of the sewing machine of the present embodiment
According to 2, the information for specifying at least one of the material and the thickness of the sewing thread 6 is input or selected as the thread information input means 45, so that the temperature of the heating element 5 at the time of thread trimming is changed to the material of the sewing thread. And the thickness (yarn count) can be easily and appropriately controlled. Further, by controlling at least one of the energizing time and the energizing duty of the current supplied to the heating element 5, the temperature of the heating element 5 at the time of thread trimming can be maintained in an appropriate state by cutting the sewing thread 6. Further, by controlling the energization duty, more precise control can be performed.

Further, the control device 32 of the sewing machine of this embodiment
According to this, the thread trimming condition setting unit 43 can easily execute the correction of the thread trimming condition stored in the thread trimming condition storage unit 47 and the storage of a new thread trimming condition in the thread trimming condition storage unit 47. In addition, the temperature of the heating element 5 at the time of thread trimming can be maintained in a state appropriate for cutting the sewing thread 6, and the start timing of the thread sweeping operation by the thread sweeping device 25 (operation start timing: thread sweeping condition) is always appropriate. And it can be easily controlled.

As another embodiment, various set values such as a thread gripping timing at the time of thread trimming, a rotation speed of a main shaft (upper shaft) at the time of thread trimming, a cloth moving direction and a moving amount at the time of thread trimming, and the like are used. It can be configured to be added as a cutting condition.

The present invention is not limited to the above embodiment, but can be variously modified as needed.

[0042]

As described above, according to the sewing machine control device of the present invention, when the thread information is inputted by the thread information input means, the thread cutting condition determining means becomes the thread cutting condition storing means. Automatically determines the thread trimming condition corresponding to the thread information from the thread trimming condition stored in the controller, and supplies the heating element to the heating element based on the thread trimming condition determined by the thread trimming condition determining unit at the time of thread trimming. Since the current to be cut can be automatically controlled, an extremely excellent effect is obtained such that the temperature of the heating element at the time of thread trimming can be maintained in a state appropriate for cutting the sewing thread.

Further, according to the sewing machine control device of the present invention, the temperature of the heating element at the time of thread trimming can be easily and appropriately adjusted according to at least one of the material and the thickness (thread count) of the sewing thread. It has an extremely excellent effect that it can be controlled to a certain degree.

According to the control device for a sewing machine of the present invention, the temperature of the heating element at the time of thread trimming can be maintained in an appropriate state by cutting the sewing thread. To play.

According to the sewing machine control device of the present invention, the thread trimming condition stored in the thread trimming condition storing means is corrected and the new thread trimming condition is stored in the thread trimming condition storing means. Can be easily executed, and the temperature of the heating element at the time of thread trimming can be maintained at a more appropriate state by cutting the sewing thread.

Further, according to the sewing machine control device of the present invention, a very excellent effect is obtained such that the thread wiping operation can be executed at an optimum time.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a main part of an embodiment of a sewing machine control device according to the present invention.

FIG. 2 is a timing table showing an example of an energizing time and an energizing duty and a thread-wiping operation timing as a reference to a heating element most suitable for a yarn material and a yarn count stored in a memory of a control device of the sewing machine in FIG. 1;

FIG. 3 is a bottom view showing an example of a sewing machine provided with a conventional thread cutting device using a heating element.

FIG. 4 is a view similar to FIG. 3, illustrating a thread cutting state of the sewing machine shown in FIG. 3;

FIG. 5 is a front view of FIG. 4;

FIG. 6 is a block diagram showing a control device of the sewing machine shown in FIG. 3;

7 is a front view showing an initial state of the thread removing device of the sewing machine shown in FIG. 3;

FIG. 8 is a view similar to FIG. 7, showing a state in which the upper thread has been removed from the thread removing device of the sewing machine shown in FIG. 7;

9 is a timing chart at the time of thread trimming of the sewing machine shown in FIG. 3;

FIG. 10 is an explanatory diagram illustrating a state in which a cut portion of a sewing thread is separated when the start timing of the thread sweeping operation in the sewing machine illustrated in FIG. 3 is too early.

[Explanation of symbols]

 3 Needle plate 4 Needle hole 5 Heating element 6 Sewing thread 6a Upper thread 6b Lower thread 7 Capture member 16 Switch section 17 Power supply 19 Heater transformer 21 Thread trimmer solenoid 25 Thread remover 26 Thread remover 27 Thread remove solenoid 28 Needle position detector 31 Sewing machine 32 Control device 34 CPU 35 Memory 36 Control circuit 37 CPU board 39 Control panel 41 Thread material input means 42 Thread count input means 43 Thread cutting condition setting means 45 Thread information input means 47 Thread cutting condition storage means 48 Thread cutting condition determination means 50 Control means N needle

Continued on the front page F term (reference) 3B150 CE00 CE01 FH02 FH03 FH06 FH09 FH17 FH20 NA00 NA49 NA76 NB16 NB17 NC00 NC11 QA00 QA04 QA06

Claims (5)

[Claims] 1. A control device for a sewing machine having a thread cutting device for cutting a sewing thread by contacting a heating element which generates heat by an electric current, a thread information inputting means for inputting information of a sewing thread, and a thread for storing thread trimming conditions. A thread cutting condition storing unit; and a thread cutting condition determining unit that determines a thread cutting condition from the thread cutting condition stored in the thread cutting condition storing unit based on the thread information input by the thread information input unit. A control device for a sewing machine, further comprising control means for performing thread trimming based on thread trimming conditions determined by thread trimming condition determining means. 2. The sewing machine control device according to claim 1, wherein the thread information input means inputs or selects information for specifying at least one of a material and a thickness of the sewing thread. 3. The sewing machine according to claim 1, wherein the thread trimming condition is a set value for determining at least one of an energization time and an energization duty of a current supplied to the heating element. Control device. 4. A thread trimming condition setting means for setting the thread trimming condition is provided.
The control means of the sewing machine according to any one of the above items. 5. The sewing machine according to claim 1, wherein the sewing machine further includes a thread removing device for pulling out an upper thread from the sewing material after the thread cutting. The sewing machine control device according to any one of claims 1 to 4, further comprising information to be determined.