JP2002253888A - Stitch ending control device for sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stop a sewing end automatic stitch ending started by mistake. SOLUTION: An operation means for stopping the sewing end stitch ending is operated during the formation of the sewing end stitch ending, a sewing machine is stopped.

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 for automatically forming a fixed stitch having a predetermined number of stitches at the end of sewing.

[0002]

2. Description of the Related Art There is known a sewing machine configured to automatically form end stop sewing of a predetermined number of stitches by performing an operation such as stepping back of a sewing pedal at the end of sewing.

[0003]

However, in such a conventional sewing machine, once stop sewing (end stop sewing) performed at the end of the sewing is started, the sewing is set in advance by a stitch number setting means or the like. Until a predetermined number of stitches at the end of the stitch were formed, the stitches could not be stopped halfway. Therefore, if the operator accidentally steps back on the sewing machine pedal, even if the operator notices on the way, the end stop sewing cannot be stopped, and the end of the predetermined number of stitches which have been sewn once is not reached. There has been a problem that it is necessary to work hard to loosen all the seams of the lock seam. In addition, there is also a problem that the sewn material is full of holes due to the needle drop and the quality of the product cannot be maintained. In particular, in the staggered sewing machine, as shown in FIG. 3C, the number of stitches is large (for example, 64 stitches).
Needle), the problem in the case of mistakenly performing the lock stitch was even greater.

The present invention has been made in view of such a problem. By performing an operation such as stepping back of a sewing pedal at the end of sewing, a stitch having a predetermined number of stitches is automatically formed. Even if a worker mistakenly performs end stitches on the configured sewing machine, the end stitches can be stopped at any time to minimize unnecessary formation of the stitches. SUMMARY OF THE INVENTION It is an object of the present invention to provide a sewing and sewing control device for a sewing machine capable of reducing the work of unraveling and maintaining the quality of a product to be sewn as a product.

[0005]

According to a first aspect of the present invention, there is provided a sewing machine control device for automatically forming a predetermined number of stitches by operating an operation means (sewing machine pedal 3) at the end of sewing. A stop operation means (sewing machine pedal 3) for generating a stop signal for stopping the lock stitch;
A control means (CPU1) for stopping the sewing machine when the stop signal is input during the formation of the lock stitch.

In such a configuration, by stopping the sewing machine by operating the stop operation means, the end stop sewing once started can be stopped at any time. Even in the case where it has been done, the formation of unnecessary fastening seams can be minimized, and the work of the operator can be reduced, and the quality of the product to be sewn can be maintained.

The invention according to a second aspect is characterized in that the sewing machine is provided with thread trimming means driven by an electric driving means (thread trimming solenoid 15) to perform thread trimming, and the control means controls the stop command. Control for performing thread trimming by the thread trimming means when the stop sewing is stopped by the means;
The sewing machine is characterized in that the sewing machine can be switched to control for continuing sewing before starting the stop sewing without performing thread trimming.

[0008] In such a configuration, the end stop sewing once started can be stopped at any time by a command from the stop command means, and after stopping the stop sewing, the operator looks at the seam, cuts the thread, and cuts the thread. It is determined whether sewing should be performed again from the beginning or whether normal sewing should be resumed without thread trimming and sewing should be continued to the original sewing position. Since the control of the sewing machine can be switched, even if the operator mistakenly starts the end stitching, the operator can change the control of the sewing machine.
The same effect as the invention described in (1) can be obtained, and more appropriate measures can be taken according to the state at that time.

According to a third aspect of the present invention, in the above-mentioned first aspect, the stitch control device includes a staggered sewing machine (staggered sewing machine 7).
Is a stop sewing control device.

As described above, it is more effective to apply the above-described stitch control device to a zigzag stitch sewing machine having a large number of stitches.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows a main configuration of a stitch sewing control device of the present invention applied to a zigzag stitch sewing machine. The CPU 1 includes a main part of control means of the stitch control device of the sewing machine of the present invention. Unit.

The pedal sensor 2 converts an operation such as stepping on the sewing machine pedal 3, neutral operation, stepping back operation, etc., performed by an operator into an electric signal and outputs it to the CPU 1.

The CPU 1 reads a signal from the pedal sensor 2 based on a speed signal from an encoder 4 for detecting the rotational speed of the main shaft of the sewing machine and a position signal from a needle position detector 5 for detecting the vertical position of the sewing needle. , And controls the rotation and stop of the main motor 8 and the pulsating motor 10 connected via the motor driver 6 and the pulsating driver 9 respectively.

The needle bar vertical movement mechanism and the cloth feed mechanism, both not shown, are driven by the rotational force of the main motor 8 to perform vertical movement of the needle bar and the cloth feed, and the rotational force of the needle swing motor 10 not shown. The needle swing mechanism is driven to perform needle swing, and staggered sewing is formed.

In the case of stop sewing performed at the start or end of sewing, a condensed feed amount is set by the condensing dial 11, and the operation of the feed dog provided in the cloth feed mechanism is controlled by the set feed amount. This is done by: The condensed feed amount can be set to zero from a reverse feed amount equal to the normal feed amount, and is set to a minute feed amount as a normal set amount. In this case, switching from the normal forward feed amount to the condensed feed amount is performed by driving the lock stitch solenoid 13 connected to the CPU 1 via the lock stitch driver 12.

A thread trimming mechanism (not shown) driven by a thread trimming solenoid 15 connected to the CPU 1 via a thread trimming driver 14 is provided on the lower surface of the bed of the sewing machine 7 to automatically perform thread trimming. It can be carried out.

The stop sewing at the end, the thread trimming, and the stop sewing at the end of the sewing according to the present invention are instructed by depressing the sewing machine pedal 3. That is, when the sewing machine pedal 3 is depressed, the CPU 1 reads the depressed signal input from the pedal sensor 2 and issues a command signal corresponding to the situation at that time to the motor driver 6, the needle swing driver 9, the lock stitch driver 12, the thread Output to the cutting driver 14 or the like to start or stop the end stop sewing, thread trimming, and the like.

The stop sewing pattern setting switch 16 is a switch for selecting a stop sewing (start stop sewing) and an end stop sewing pattern to be performed at the start of sewing. In the case of a staggered sewing machine, for example, three staggered stitches are set. It is possible to select, for example, whether the stitches are four-point staggered, and the needle swinging mechanism performs the needle swing based on the fastening pattern selected by the fastening sewing pattern setting switch 16. A in FIG.
The patterns of the start stop stitch and the end stop stitch shown in C and C are for the case where the four-point staggered pattern is selected.

A start stop stitching number setting switch 17 and an end stop stitching number setting switch 18 are switches for setting the number of stitches for the start stop stitch and the end stop stitch, respectively. In some cases, a large number of stitches, such as 64 stitches, may be set for both end stitches.

The start stop stitching switch 19 and the end stop stitching switch 20 are switches for setting whether or not to perform start stop stitching and end stop stitching, respectively, and are applicable only when these switches are set to ON. Lock stitches can be performed.

The various switches 16 to 20 described above are arranged on an operation panel (not shown), and can be set at any time by an operator.

Next, an embodiment of the present invention will be described with reference to the flowchart of FIG.

First, in step S1, the sewing machine pedal 3
Is determined by the CPU 1 based on a signal input from the signal of the pedal sensor 2.

If it is determined that the user has stepped forward, step S
In 2, it is determined whether or not the first stop sewing switch 19 is set to ON. Start stop sewing switch 19
Is set to ON, the process proceeds to step S3, and the setting conditions of the start stitch sewing such as the stitch pattern selection switch 16 and the stitch stitch stitch number setting switch 17 are read.

Next, the process proceeds to step S4, and the first stop sewing is executed based on the setting conditions read in step S3. In this initial stop sewing, the stop sewing solenoid 13 is driven via the stop sewing driver 12 to set the cloth feed amount to the condensed feed amount set by the condensed dial 11, and the motor driver 6 and the needle swing driver 9 are used. The main motor 8 and the swinging motor 10
Is carried out. That is, at the start stop sewing, the cloth feed mechanism is driven by the condensed feed amount while the needle is moved up and down by the rotation of the main motor 8, and the needle swing mechanism is driven by the rotation of the needle swing motor 10. Done.

Next, the process proceeds to step S5, and it is determined whether or not the stop stitching has been performed for the number of stitches set by the stitching stitch number setting switch 17 at the beginning. Here, if a negative determination is made, the process returns to step S4 to start the stop sewing, and if a positive determination is made, the process proceeds to step S6.

On the other hand, if it is determined in step S2 that the lock stitch switch 19 has not been set to ON, the process proceeds to step S6 without performing the lock stitch.

In step S6, normal sewing is performed by operating the sewing machine pedal 3, and the process proceeds to step S7. The normal sewing referred to herein is sewing such as starting, shifting, and stopping the sewing machine by operations such as depressing and neutralizing the sewing machine pedal 3 performed by an operator, and the stitches shown in FIG. 3B are formed. You. In this normal sewing,
The zigzag sewing pattern, the cloth feed amount, the needle swing amount, and the like are determined based on conditions set by well-known setting means (not shown) such as a zigzag sewing pattern selection switch, a feed adjustment dial, and a swing width setting switch. The swinging mechanism is driven by the main motor 8 and the swinging motor 10.

Next, in step S7, it is determined whether or not the sewing machine pedal 3 has been depressed again, based on a signal input from the pedal sensor 2. Here, if the determination is negative, that is, if it is determined that the sewing machine pedal 3 has not been stepped back, the routine returns to step S6 and normal sewing by pedal operation is continued. On the other hand, if affirmative, that is, if it is determined that the sewing machine pedal 3 is depressed, step S
Move to 8.

In step S8, it is determined whether or not the end stop sewing switch 20 is set to ON. If the end stop sewing switch 20 is set to ON, the process proceeds to step S9, and the setting conditions of the end stop sewing such as the stop sewing pattern selection switch 16 and the end stop sewing needle number setting switch 18 are read. S1
Move to 0. In the present embodiment, the same fixed stitch pattern set by the fixed stitch pattern selection switch 16 is used for the fixed stitch at the start and the end of the sewing. good.

In step S10, end stop sewing is performed based on the setting conditions read in step S9.
Next, in step S11, it is determined whether or not the number of stitches has been performed for the number of stitches set by the end stitching stitch number setting switch 18, and if an affirmative determination is made, the process proceeds to step S11.
It moves to 12.

On the other hand, if it is determined in step S8 that the end stop sewing switch 20 has not been set to ON,
The process proceeds to step S12 without performing the end stop sewing.

In step S12, the thread cutting driver 14
A drive signal of the thread cutting solenoid 15 is output from the CPU 1 through the CPU, the thread cutting mechanism is driven to perform thread cutting, and the process proceeds to step S13 to perform a process of stopping the sewing machine.

If a negative determination is made in step S11, the process proceeds to step S14, and it is input from the pedal sensor 2 whether or not the sewing machine pedal 3 which has been depressed in step S7 is returned to neutral once. It is determined by the signal. Here, when it is determined that the result is affirmative, that is, when it is determined that the sewing machine pedal 3 has been returned to the neutral position, it is determined in step S15 whether the sewing machine pedal 3 has been depressed again.

If it is determined in step S14 that the neutral operation of the pedal has not been performed, or
If it is determined in step 15 that the pedal has not been depressed, the process returns to step S10 to continue the end stitching.

If the determination in step S15 is affirmative, that is, it is determined that the sewing machine pedal 3 has been depressed again, C
The PU 1 determines that this signal is a stop sewing stop signal, outputs a stop signal to the main motor 8 and the needle swing motor via the motor driver 6 and the needle swing driver 9, and stops the sewing machine. That is, after the end stop sewing is started, the end stop sewing can be stopped by performing the neutral operation and the returning operation of the sewing machine pedal 3 again.

Next, the process proceeds to step S17, waits for the sewing machine pedal 3 which has been depressed in step S15 to be returned to neutral, and when it is determined that the sewing machine pedal 3 has been returned to neutral,
Move to step S18.

In step S18, the process waits for the sewing machine pedal 3 to be operated forward or backward. When the front stepping operation is performed, the process returns to step S6, and the normal sewing by the sewing machine pedal 3 before the first stepping operation is performed.

If it is determined in step S18 that the sewing machine pedal 3 has been depressed, the operation proceeds to step S1.
The process proceeds to 2 where thread trimming is performed.

Therefore, in step S18, when the end stop sewing is stopped, the operator should perform thread trimming and loosen the thread to start sewing again from the beginning, or perform ordinary sewing without thread trimming from there. Judge whether to restart and continue sewing to the original sewing position by checking the sewing state of the sewing object, and select whether to perform the front stepping operation or the stepping back operation based on the judgment. Thereby, even if the end stop sewing is performed by mistake, an optimum response can be made.

The present invention is not limited to the above-described embodiment, but can be variously modified without departing from the technical idea of the present invention.

For example, in the present embodiment, a stop stop sewing signal is generated by depressing the sewing machine pedal 3 while the end stop sewing is being formed. It is also possible to adopt a configuration in which a stop signal of the end stop sewing is generated by the front depressing operation of the pedal 3.

In this embodiment, a stop operation means for generating a stop signal for stopping the stop sewing at the end of sewing, and a thread trimming operation when the stop sewing is stopped by the operation of the stop operation means The sewing machine pedal 3 is used as operation means for switching between control for performing thread trimming by means and control for continuing sewing before starting the stop sewing without performing thread trimming. Although the stop sewing can be stopped, it is a matter of course that these operation means may be provided with separate operation means without using the sewing machine pedal 3.

In the case where the returning operation of the sewing machine pedal 3 is continued, the end stitching is continued, and in the case where the sewing machine 3 is returned to the neutral position in the middle, the sewing machine is temporarily stopped.
The thread trimming may be performed when a separately provided operation means is operated, and the end stop sewing may be restarted when the operation means is depressed and operated again without being operated.

Further, although the needle swing mechanism of the present embodiment uses the needle swing motor 10 as a drive source, a well-known needle swing mechanism using the main motor 8 as a drive source may be used. in this case,
The stop sewing can be stopped only by stopping the main motor 8.

In this embodiment, the case where the sewing and sewing control device of the present invention is applied to a zigzag stitch sewing machine is described. Automatically for the specified number of stitches by operation,
Needless to say, a sewing machine which forms a well-known end stop sewing in which the cloth feed is reversely or minutely fed is applicable.

[0048]

As described above, according to the first aspect of the present invention, there is provided a sewing machine with a sewing machine in which a sewing machine having a predetermined number of stitches is automatically formed by operating an operating means at the end of sewing. By operating the stop operation means during the formation of the end sewing, the control means stops the sewing machine and stops the sewing at the end of sewing. It is possible to minimize the required formation of the seams of the lock stitches, reduce the work of the worker to loosen the seams of the lock seams, and maintain the quality of the product to be sewn as a product .

According to the second aspect of the present invention, when the stop stitching is stopped by the operation of the stop operation means, control for performing thread cutting by the thread cutting means is provided. Since it is configured to be switchable to control for continuing sewing before the start of the lock stitching, in addition to the effect of claim 1, the operator looks at the seam after stopping the lock stitching,
Judge whether to perform thread trimming and loosen the thread and start sewing again from the beginning, or to resume normal sewing without thread trimming and continue sewing to the original sewing position. Based on this, the control of the sewing machine after the stop sewing can be switched. Therefore, the operator can take not only the stop sewing at the end of the sewing but also take an optimal treatment according to the situation at that time.

According to the third aspect of the present invention, since the above-described stitch control device is applied to a staggered sewing machine having a large number of stitches at the end of sewing, the effects of the first and second aspects are further enhanced. Becomes

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of a lacing control device of the present invention.

FIG. 2 is a flowchart showing the control of the fastening control device of the present invention.

FIG. 3 is an explanatory diagram showing stitches of stop stitches of a staggered sewing machine.

[Explanation of symbols]

 1 CPU 2 Pedal sensor 3 Sewing machine pedal 8 Main motor 13 Lock stitch solenoid

Claims (3)

[Claims] 1. A stop stitching control device for a sewing machine which automatically forms stop stitches of a predetermined number of stitches by operation of an operation means at the end of sewing, a stop operation means for generating a stop signal for stopping the stop stitching; And a control means for stopping the sewing machine when the stop signal is input during formation of the lock stitch. 2. The sewing machine further comprises thread trimming means driven by an electric drive means to perform thread trimming, and wherein the control means controls the sewing machine when the stop sewing is stopped by operation of the stop operation means. 2. The sewing machine according to claim 1, wherein the sewing machine can be switched between a control for performing thread trimming by the thread trimming means and a control for continuing sewing before starting the stop sewing without performing thread trimming. Sewing control device. 3. The sewing machine according to claim 1, wherein said sewing controller is a sewing controller of a staggered sewing machine.
2. The sewing machine control device according to claim 2.