JP2800556B2 - sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing machine in which history data in which a situation when an abnormality occurs in a sewing operation is cumulatively stored is used for controlling a sewing machine.

[0002]

2. Description of the Related Art In a sewing machine, for example, a multi-head embroidery sewing machine having a plurality of sewing machine heads, a control device controls a needle drop position for each needle (a relative movement amount of a needle bar in the X-axis and Y-axis directions). The needle bar provided on each sewing machine head is moved up and down while moving the embroidery frame holding the work cloth in the X-axis and Y-axis directions based on the embroidery data instructing the work cloth. A plurality of embroideries are formed simultaneously.

In this type of multi-head embroidery sewing machine, for example, Japanese Patent Application Laid-Open Nos. Sho 62-57588 and Sho 6
As disclosed in Japanese Unexamined Patent Publication No. 2-57585 and Japanese Unexamined Patent Publication No. 2-91264, the time required for sewing (finished embroidery time) is automatically obtained before the start of operation, and a production plan is determined based on the prediction. Efficiency, such as standing, is being improved. This sewing time reads embroidery data and set speed,
From the sewing speed (the number of revolutions of the spindle motor) and the length of each stitch, the time required for sewing one stitch is integrated and calculated over all stitches.

[0004]

In the embroidery sewing machine described above, the thread often breaks during the sewing operation. The likelihood of thread breakage varies depending on the sewing speed, stitch length, thread thickness and type, and the like, but thread breakage is inevitable for the sewing machine. In addition, if there is an adjustment failure, a failure, or the like of the drive unit of the sewing machine, thread breakage frequently occurs.

Generally, an embroidery sewing machine is provided with a thread break sensor for detecting the occurrence of a thread break, and when a thread break occurs, a buzzer or the like informs the user of the break and also stops the sewing operation at that time. After the operator performs a thread break repairing operation, the sewing operation is restarted by operating the return switch.

However, in the conventional calculation method of the sewing time prediction, since the loss time due to the occurrence of the thread break is not taken into consideration, if the thread break occurs during the sewing operation, the estimated time is shorter than the estimated time. The time required for actual sewing will be significantly prolonged. Therefore, the conventional sewing time prediction method has a drawback in that the possibility of occurrence of a sewing operation abnormality is not taken into consideration, and that the predicted sewing time cannot be very reliable.

Further, in the conventional machine, the operator is only informed of the occurrence of a thread break each time. Therefore, the cause of the thread break is not truly inevitable. Even if the problem could be easily resolved, such as because of poor adjustment or because the sewing speed was too high, the operator could not easily recognize the cause, and eventually the same thread There was a problem that the cutting efficiency was reduced repeatedly and the work efficiency was reduced unnecessarily.

The present invention has been made in view of the above circumstances, and has as its object to effectively use a history of sewing operation abnormalities such as thread breaks that have occurred in the past to improve the efficiency of subsequent sewing operations. Is to provide a sewing machine that can.

[0009]

According to the present invention, there is provided a sewing machine body which performs a sewing operation by moving a work cloth relative to the needle bar while moving the needle bar up and down, and a sewing machine having the sewing machine. Abnormality detecting means for detecting the occurrence of an abnormality in the sewing operation; storage means for cumulatively storing a state of the sewing operation of the sewing machine body when the occurrence of the abnormality is detected by the abnormality detecting means; and It is characterized in that it comprises a history data processing means for processing the stored history data of the occurrence of the abnormality so as to be used for controlling the sewing machine main body.

In this case, the abnormality detecting means comprises a thread break sensor for detecting a yarn supply abnormality to the needle bar, and the history data processing means calculates a frequency of occurrence of the thread break so that when the frequency is high, It can be configured to notify an abnormality.

The abnormality detecting means comprises a thread breakage sensor for detecting a yarn supply abnormality to the needle bar, and the history data processing means calculates a frequency of occurrence of thread breakage for each sewing operation condition to thereby detect thread breakage. It is effective if the sewing operation is controlled so as to reduce the occurrence of the sewing operation.

Further, the abnormality detecting means comprises a thread breakage sensor for detecting a yarn supply abnormality to the needle bar, and the history data processing means controls the yarn breakage based on the result of calculating the frequency of occurrence of thread breakage. The sewing time may be estimated in consideration of the possibility of occurrence.

[0013]

According to the sewing machine of the present invention, it is detected by the abnormality detecting means that the sewing operation of the sewing machine is abnormal.
The state of the sewing operation of the sewing machine main body when the occurrence of the abnormality is detected is cumulatively stored in the storage means, and thus the history data is configured. Then, the history data processing means processes the history data so as to be used for controlling the sewing machine main body. Therefore, the history of sewing operation abnormalities such as thread breakage that occurred in the past can be used to improve the efficiency of subsequent sewing operations. It can be used effectively.

In this case, if the yarn breakage sensor detects a yarn supply abnormality to the needle bar and calculates the frequency of occurrence of the yarn breakage from the history data, the yarn breakage can be reduced to a standard level due to an improper adjustment of the drive unit. It can be determined whether or not the occurrence has occurred exceeding the frequency, and when the frequency is high, the abnormality is notified, thereby prompting the operator to take appropriate action promptly.

Further, if a thread breakage sensor detects a thread supply abnormality to the needle bar and calculates the frequency of thread breakage occurrence for each sewing operation condition such as sewing speed from the history data, the probability of thread breakage occurrence can be obtained. High and low situations can be determined,
It is possible to improve the efficiency by controlling the sewing operation such as changing the sewing speed so as to reduce the occurrence of thread breakage.

Further, it is possible to predict the possibility of occurrence of a thread break in the future by detecting a yarn supply abnormality to the needle bar by a thread break sensor and calculating the frequency of occurrence of the thread break from the history data. This makes it possible to predict the sewing time with high reliability in consideration of the loss time due to the occurrence of thread breakage.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a multi-head embroidery sewing machine will be described below with reference to the drawings. First, the overall configuration of the multi-head embroidery sewing machine according to the present embodiment will be briefly described with reference to FIGS.

As shown in FIG. 6, the sewing machine body 1 has a plurality of (only three shown in FIG. 6) sewing machine heads 3 above a sewing machine table 2 which is long in the horizontal direction (X-axis direction). It is configured so as to be arranged side by side at intervals. Each of the sewing machine heads 3 is provided with a support case 5 having a plurality of needle bars 4 in this case. The four needle bars 4 are vertically movably supported by a support case 5 side by side, and different types (colors) of embroidery threads are supplied to the lower sewing needle 6 from a thread supply source (not shown). It is being supplied.

The supporting case 5 is attached to the sewing machine head 3 so as to be slidable in the horizontal direction, and is moved by a needle bar selecting motor 7. Although not shown in detail, in each sewing machine head 3, the rotation of a spindle (not shown) rotated at a variable speed by a spindle motor 8 (shown only in FIG. 7) is converted into a vertical movement of the needle bar 4. A drive mechanism is provided. In this case, the driving force of the spindle is
The transmission is performed only to the needle bar 4 positioned at a predetermined use position. Therefore, by moving the support case 5 by the needle bar selection motor 7, one of the four needle bars 4 is moved. Only the needle bar 4 is selectively moved up and down. In this embodiment, the plurality of sewing machine heads 3 are used.
Are distinguished by, for example, numbers 1, 2, 3,... In order from the left, and four needle bars 4 of each sewing machine head 3 are also numbered 1, 2, 3, 4, also in order from the left. They are distinguished by numbers.

The sewing machine head 3 is provided with a known thread break sensor 9 (shown only in FIG. 7) as abnormality detecting means corresponding to each needle bar 4. Although not shown in detail, the thread breakage sensor 9 detects whether there is an abnormality in the supply of the embroidery thread to the sewing needle 6 based on the displacement of a thread take-up spring (not shown).

On the other hand, a shuttle mechanism (not shown) for forming a stitch on a work cloth in cooperation with the sewing needle 6 is provided on the sewing machine table 2 in correspondence with each sewing machine head 3. An embroidery frame 10 for holding a work cloth (not shown) is provided. The embroidery frame 10 has, for example, a rectangular frame shape extending in the X-axis direction on the sewing machine table 2, and holds a horizontally long work cloth under the plurality of sewing machine heads 3.

The embroidery frame 10 is provided so as to be movable in the horizontal direction (X-axis and Y-axis directions) on the sewing machine table 2 and is moved to any position in the X-axis and Y-axis directions by a moving mechanism. Has become. This moving mechanism includes an X-axis direction moving mechanism 11 for moving the embroidery frame 10 in the X-axis direction, and
The embroidery frame 10 includes a Y-axis direction moving mechanism 12 for moving the embroidery frame 10 in the Y-axis direction (front-back direction).

The X-axis direction moving mechanism 11 includes an X-axis drive motor 13 composed of a stepping motor (see FIG. 7).
As a drive source, and the Y-axis direction moving mechanism 12 is configured to include, as a drive source, a Y-axis drive motor 14 (see FIG. 7) also formed of a stepping motor.

Each of the above mechanisms is provided by a control device 15 shown in FIG.
Is controlled by the This control device 15
Is mainly composed of a microcomputer including a CPU 16, an EEPROM 17, a RAM 18, and a bus 19 for interconnecting them, and an output interface 20 and an input interface 21 are connected to the bus 19.

The output interface 20 includes the spindle motor 8, the X-axis drive motor 18, the Y-axis drive motor 19
And motor drive circuits 22, 23, 24 and 25 for driving the plurality of needle bar selection motors 7, respectively, and a display drive circuit 27 for driving a display device 26 such as a CRT display. Have been. The input interface 21 includes the thread break sensor 9.
In addition, a floppy disk drive 28 for reading embroidery data, a keyboard 29 for the operator to perform various input operations, and a speed for the operator to set the sewing speed (in this case, the upper limit of the rotation speed of the spindle motor 8) An adjustment volume 30 is connected.

Thus, the control device 15 is controlled by the EEPROM
17 and the embroidery data read into the RAM 18 to control the spindle motor 8, the X-axis drive motor 13, the Y-axis drive motor 14, and the needle bar of each sewing machine head 3. Control the selection motor 7,
The embroidery operation on the work cloth is automatically performed.

Here, the embroidery data will be briefly described. In the present embodiment, this embroidery data is obtained by using X stitches of one stitch from one needle drop point to the next needle drop point on the work cloth.
It is composed of a set of stitch data indicating the movement distance in the axis and Y-axis directions, and further includes needle bar number data for changing the needle bar 4 at the required position. With this, the first needle bar 4 is red, the second is blue,.
If different colors of embroidery threads are set on each needle bar 4, the color change is automatically performed. The embroidery data is stored and provided on a floppy disk, for example, and is read into the RAM 18 by the floppy disk drive 28 at the time of starting the sewing operation.

The control device 15 automatically executes the sewing operation based on the embroidery data by the software configuration, and stores the contents in the EEPROM 17 in which the contents can be electrically rewritten as described later. The history data of the past sewing operation status in the sewing machine main body 1 is cumulatively stored, and the history data is processed so as to be used for operation control. Therefore, the EEPROM
17 functions as storage means according to the present invention, and the control device 1
5 functions as history data processing means according to the present invention.

FIG. 8 shows the contents of the EEPROM 17. In this EEPROM 17, in addition to a program area 17a for storing a control program and the like, information areas 17b to 17h for storing the following history data and the like.
Is provided.

First, a thread breakage information area 17b for each head needle bar
In the table, data such as how many times thread breakage has occurred in the past is stored in the numbered needle bar 4 of the numbered sewing machine head 3. FIG. 10 shows a specific example. For example, no thread break has occurred in the first needle bar 4 of the first sewing machine head 3 in the past, and no Data indicating the occurrence of thread breakage is stored, and the frequency of how many times a thread break has occurred per 1000 stitches is calculated from the accumulated number of times and stored together. In this case, the needle bar 4 whose thread breakage frequency per thousand stitches is abnormally high (in FIG.
The numbered needle bar 4) can be estimated to have an improper adjustment or failure.

In order to calculate the frequency, the number of stitches in the past sewing operation is cumulatively counted and stored in the total stitch number counting area 17h for each stitch length and speed.

Next, although illustration of a specific example is omitted, the thread break information area 17c for each thread number stores data on how many thread breaks have occurred in the past for each type of embroidery thread.

The frequency of thread breakage per thousand stitches is calculated and stored in the thread breakage information area 17d for each set speed with respect to the sewing speed set by the operator using the speed adjustment volume 30. . FIG. 11 shows a specific example, in which the set speed (the number of revolutions of the spindle motor 8) can be set in increments of 50 rpm. For example, at 500 rpm, 0.2 is set for every 1,000 stitches.
Data indicating that a thread break has occurred is stored. From this data, the operator can set the setting speed to, for example, 9
It can be determined that 00 rpm is the limit. In this case, generally, as the sewing speed (sewing speed) increases, thread breakage tends to occur more easily.

Next thread break information area 17e by stitch length
Is calculated and stored as to how many times a thread break has occurred per thousand stitches with respect to the stitch length. FIG. 12 shows a specific example, in which the maximum length of one stitch is set to 12 mm, and the stitch length is divided into, for example, four stages, and the frequency of each thread break is obtained.
In this case, generally, as the stitch length becomes shorter, thread breakage tends to occur.

In the sewing speed information area 17f for each set speed and stitch length, an appropriate sewing speed (sewing speed) for actually performing the sewing operation with respect to the set speed and the stitch length is stored. FIG. 13 shows a specific example. In this case, generally, as the stitch length becomes longer, the sewing speed must be lower than the setting speed set by the operator. In this embodiment, the setting speed is 550 rpm. And the stitch length is 1.0
mm or less when the frequency of thread breakage is high,
The sewing speed is automatically changed.

The average sewing speed information for the actual sewing speed and the stitch length is calculated and stored in the average sewing speed information area 17g for each sewing speed and for each stitch length. FIG. 14 shows a specific example thereof. The average sewing speed is an average sewing speed including the time required for repairing a thread break. From the average sewing speed, it is possible to predict the sewing time (the sewing rise time for the read embroidery data) in consideration of the loss time due to the thread breakage.

On the other hand, as shown in FIG.
Inside are a general-purpose counter 18a, an embroidery data area 18b into which embroidery data is read, various thread breakage counters 18c for counting the number of thread breaks for each situation, and a needle bar for storing thread number information and the like for each needle bar 4. A thread number information area 18d, a repair time counter 18e for counting the time required for repairing a thread break, and a predicted sewing up time area 18f for storing the calculated predicted sewing up time are provided along with a working area, a temporary area, and the like. .

Next, the operation of the above configuration will be described mainly with reference to FIGS. In the present embodiment, the control device 15 can perform the processing shown in the flowchart of FIG. That is, when the power is turned on, in step S1, whether to execute the sewing operation, to predict the sewing up time, to display the thread breakage information, or to end the display on the screen of the display device 26 is displayed. A selection screen is displayed, and the operator performs a selection operation.

Here, if the operator selects the execution of the sewing operation, the sewing process is performed in the next step S2. If the prediction of the sewing up time is selected, step S3
In, the processing of the sewing up time prediction is performed. If the display of the thread break information is selected, a process of displaying the thread break information is performed in step S4. The specific contents of these processes will be described in detail below.

First, the sewing process (step S)
The contents of 2) will be described with reference to the flowcharts of FIGS. Note that FIGS. 2 and 3 are one flowchart, but are divided into two in view of space.

First, as shown in FIG.
Then, the embroidery data designated by the operator is read into the RAM 18. Then, in the next step S12, the upper limit value (set speed) of the sewing speed set by the operator using the speed adjustment volume 30 is read.
, The sewing speed data for each stitch length corresponding to the set speed from the EEPROM 17 (see FIG. 13).
Is read.

As shown in FIG. 13, for example, if the set speed is 500 rpm, the sewing speed is 500 rpm if the stitch length is 1 mm or less.
m, when the stitch length is 1-3 mm, 500 rpm,
When the stitch length is 3 to 6 mm, the sewing operation is performed at 450 rpm, and when the stitch length is 6 to 12 mm, the sewing operation is performed at 400 rpm.

In step S14, it is asked whether a thread number of the embroidery thread (a number assigned according to the thickness of the thread) is to be input.
When the thread number data is used for control (Ye
s) In step S15, the operator operates the keyboard 29 to input the thread number of the embroidery thread set on each needle bar 4. On the other hand, when the thread number is not used for control (No), the process directly proceeds to step S16.

When the sewing operation is started (Yes in step S16), first, in step S17, a timer for counting the sewing work time is started, and sewing for each stitch is started (step S17). This sewing operation is performed in step S13).
The sewing is performed at the sewing speed according to the stitch length read in. During this sewing operation, the detection signal of the thread break sensor 9 is constantly monitored (step S19).

Here, if a thread break occurs in any of the needle bars 4 (Yes in step S19), the entire sewing operation is stopped (step S20), and a repair timer for counting a repair time is started. (Step S2
1) A warning sound to the effect that a thread break has occurred due to the buzzer is issued to the operator (step S22). At the same time, in step S23, the control device 15 stores the sewing machine head number 3 and the needle bar 4 number where the thread break has occurred, the thread number (only at the time of input), the stitch length, and the sewing speed.

Thereafter, a repair work is performed by the operator (step S24), and when restarted (Yes in step S25), the repair timer is stopped (step S26), and the time required for repair is calculated. After being stored and stored (step S27), the sewing operation from the point of the stop is resumed. When the sewing operation proceeds and the sewing of all stitches is completed (Yes in step S28), the timer is stopped (step S29), and the time required for the sewing is calculated and stored (step S30).

When the sewing operation has been completed in this manner, the routine of step S31 and subsequent steps is performed in the EEPROM.
The history data in 17 is rewritten by adding the history of the sewing operation completed here (see FIG. 3 below).

That is, first, in step S31, the EEP
The number of stitches for each set speed is read from the total number of stitches for each set speed in the ROM 17 from the total stitch number count area 17h for each stitch length. In step S32, a new total stitch number count is calculated. The data of the separate total stitch count area 17h is updated.

Then, in step S33, EEPRO
The average sewing speed according to the stitch length according to the sewing speed (see FIG. 14) is read from M17, and in step S34, a new average sewing speed including the time to repair the thread break is calculated, and the average sewing speed according to the stitch length according to the sewing speed is calculated. The data in the information area 17g is updated.

Next, in step S35, the EEPROM
17, the head needle bar-specific thread break information (see FIG. 10) is read out, and in step S36, new head needle bar-specific thread break information is calculated, and the data in the head needle bar-specific thread break information area 17b is calculated. Update.

In the next step S37, the above step S
It is determined at 15 whether or not a thread number has been input. Only when the input has been made (Yes), the thread number break information is read out from the thread number break information area 17c of the EEPROM 17 (step S38). Ban thread break information area 17
The data of c is updated (step S39).

Subsequently, in step S40, EEPRO
The thread breakage information for each setting speed is read from M17 (see FIG. 11), and in step S41, a new thread breakage occurrence frequency for each setting speed is calculated, and the data in the thread breaking information area 17d for each setting speed is updated.

Further, at step S42, EEPRO
The thread breakage information by stitch length is read from M17 (see FIG. 12), and in step S43, the frequency of occurrence of thread breakage by new stitch length is calculated, and the thread breakage information area by stitch length 1
The data of 7e is updated.

Finally, in step S44, the EEPRO
The sewing speed information according to the set speed and the stitch length according to the set speed (see FIG. 13) is read out from M17, and in step S45, the stitching speed is set to be small for the stitch length where the thread breakage occurs frequently. The data of the sewing speed information area 17f for each set speed and for each stitch length is changed in the direction of slowing down.

By the above processing, the EEPROM 1
7 shows the state of sewing operation when thread breakage occurs (sewing machine head 3 and needle bar 4 number, setting speed, sewing speed,
The history data according to the stitch length, thread number, time required for repair, etc.) is cumulatively stored. Also,
Stitching speed according to stitch length against set speed (Fig. 1
3) is sequentially updated in a direction to reduce the occurrence of thread breakage. As a result, the frequency of occurrence of thread breakage can be gradually reduced, and as a result, efficiency can be improved due to shortening of sewing time, and quality of sewing products can be improved.

Next, the above-described sewing up time prediction processing (FIG. 1)
Step S3) will be described with reference to the flowchart of FIG. First, in step S51,
The embroidery data is read. Then, in step S52, from the speed set by the speed adjustment volume 30,
The sewing speed according to the set speed and the stitch length according to the stitch length (see FIG. 13) is read. Further, in step S53, the average sewing speed according to the sewing speed and the stitch length (see FIG. 14) is read.

In the next step S54, a calculation of the sewing time is performed. In this calculation, the stitch length for each stitch is obtained from the embroidery data, and the average sewing speed for the stitch length is calculated for each stitch. The sewing time for all stitches is calculated by integrating the time required for sewing. The calculated predicted sewing time is displayed on the display device 26 in step S55.

Thus, the operator can make an efficient production plan based on the predicted time. In this case, the data of the average sewing speed stored in the average sewing speed information area 17g by stitch length by sewing speed takes into account the loss time caused by the occurrence of thread breakage in the past. The reliability is extremely high.

Finally, the flowchart of FIG. 5 shows the contents of the processing of displaying the thread breakage information (step S4 of FIG. 1). First, in step S61, the EEPROM
Thread readout information (see FIG. 10) is read from the head needle bar 17 and the data content is displayed on the display device 2 in step S62.
6 is displayed. This display may be in the form of a table as shown in FIG. 10 or, for example, a graph such as a bar graph.

Further, in step S63, if there is yarn breakage information for each yarn number, it is read out, and in step S64 it is also displayed. The operator can easily know the needle bar 4 and the thread number where the thread breakage is likely to occur by looking at these displays. For example, the operator can perform the sewing operation while avoiding the needle bar 4 and the thread number.

If the frequency of thread breakage is particularly high, it is considered that the drive unit of the sewing machine main body 1 has a failure or an improper adjustment, so that the operator can immediately take appropriate measures. In this case, if a specific needle bar 4 has a thread breakage with a frequency exceeding twice the average, for example, the abnormality is notified not only at the above-mentioned display but also at any time. If configured, it is more effective. still,
In addition to the above two types of data, the thread breakage information for each set speed (see FIG. 11) may be displayed.

As described above, according to the present embodiment, various conditions such as the number of the needle bar 4 in which thread breakage occurred in the past, the sewing speed and stitch length at that time, and the time required for repairing the thread breakage are accumulated. Since the history data is stored in a predetermined manner, it is possible to perform a predetermined processing of the history data and to effectively use the history data for controlling a sewing operation later.

More specifically, first, the needle bar 4
Since the frequency of occurrence of thread breaks is calculated and displayed for each thread number or for each set speed, the operator is notified each time that a thread break has occurred. It is possible to avoid the use of the needle bar 4 and the set speed which are frequently used, and to promptly take measures against the improper adjustment of the drive unit, thereby enabling efficient sewing work with less thread breakage. is there.

Then, from the history data, a situation where the probability of thread breakage occurrence with respect to the sewing speed and stitch length is high or low is determined, and the sewing speed for each stitch length is automatically changed sequentially in the direction in which thread breakage occurrence is small. As a result, a so-called learning function is added to the sewing machine itself, and the efficiency of the sewing operation can be improved.

Furthermore, since the frequency of occurrence of thread breaks is calculated from the history data and the sewing time is predicted in consideration of the possibility of future thread breaks, loss due to the inevitable thread breaks is performed. Unlike the conventional prediction method in which time is not taken into account, the sewing time can be predicted with high reliability, and the working efficiency can be improved.

In the above-described embodiment, the history data is used for three kinds of processing of changing the sewing speed, calculating the sewing time, and displaying the frequency of thread breakage. It may be configured to perform only necessary processing.

In the above embodiment, the present invention is applied to a multi-head embroidery sewing machine. However, the present invention may be applied to a single-head embroidery sewing machine, or may be applied to a sewing machine other than an embroidery sewing machine. It is also possible. Moreover,
The abnormality of the sewing operation is not limited to the thread supply abnormality, but may be configured to detect and store, for example, an abnormality such as burning of a mechanical portion or a step-out of each motor.

In addition, for example, an external storage device such as a hard disk drive may be used as the storage means, and not only the estimated sewing time is displayed in advance, but also the remaining time during the sewing operation is displayed. The present invention can be appropriately modified and implemented without departing from the gist, for example, it may be used for cost management and the like.

[0069]

As apparent from the above description, according to the present invention, the following excellent effects can be obtained.

That is, according to the sewing machine of the first aspect, abnormality detecting means for detecting occurrence of an abnormality in the sewing operation, storage means for cumulatively storing the state of the sewing operation at the time of occurrence of the abnormality, and processing of the history data. With such a processing means, the history of sewing operation abnormalities such as thread breakage that occurred in the past can be effectively used to improve the efficiency of subsequent sewing operations.

According to the second aspect of the present invention, it is possible to determine whether or not thread breakage has occurred beyond a standard frequency due to factors such as poor adjustment of the drive unit. The notification can prompt the operator to take an appropriate action promptly, thereby improving the work efficiency.

Further, according to the sewing machine of the third aspect, it is possible to determine a situation where the probability of thread breakage is high and a situation where the probability of thread breakage is low, and control the sewing operation by changing the sewing speed to reduce the occurrence of thread breakage. The efficiency can be improved.

Further, according to the sewing machine of the fourth aspect, it is possible to predict the possibility of thread breakage, and to predict the sewing time with high reliability in consideration of the loss time when thread breakage occurs. Is what you can do.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention, and is a flowchart showing processing contents of a control device.

FIG. 2 is a flowchart showing a processing procedure in a sewing operation (part 1);

FIG. 3 is a flowchart showing a processing procedure in a sewing operation (part 2);

FIG. 4 is a flowchart showing a procedure for estimating a sewing up time.

FIG. 5 is a flowchart showing a procedure for displaying thread breakage information.

FIG. 6 is a perspective view showing the appearance of a multi-head embroidery sewing machine.

FIG. 7 is a block diagram showing an electrical configuration.

FIG. 8 is a diagram conceptually showing the contents of an EEPROM.

FIG. 9 is a diagram conceptually showing the contents of a RAM.

FIG. 10 is a diagram showing an example of the content of thread break information by head needle bar.

FIG. 11 is a diagram showing an example of the content of thread breakage information by setting speed.

FIG. 12 is a diagram showing an example of the content of thread breakage information by stitch length.

FIG. 13 is a diagram showing an example of the content of stitching speed information by stitch length by setting speed.

FIG. 14 is a diagram showing an example of contents of average sewing speed information by stitch length by sewing speed;

[Explanation of symbols]

In the drawing, 1 is a sewing machine main body, 3 is a sewing machine head, 4 is a needle bar,
8 is a spindle motor, 9 is a thread break sensor (abnormality detection means),
10 is an embroidery frame, 11 is an X-axis direction moving mechanism, 12 is a Y-axis direction moving mechanism, 15 is a control device (history data processing means),
17 is an EEPROM (storage means), 26 is a display device, 3
0 indicates a speed adjustment volume.

Claims (4)

(57) [Claims] 1. A sewing machine main body which performs a sewing operation by moving a work cloth relative to the needle bar while vertically moving a needle bar, and an abnormality which detects occurrence of an abnormality in the sewing operation of the sewing machine main body. Detection means; storage means for cumulatively storing the state of the sewing operation of the sewing machine body when the occurrence of an abnormality is detected by the abnormality detection means; and history data of the occurrence of the abnormality stored in the storage means. A sewing machine comprising: history data processing means for performing processing for use in controlling the sewing machine main body. 2. The abnormality detecting means comprises a thread breakage sensor for detecting a yarn supply abnormality to the needle bar, and the history data processing means calculates a frequency of occurrence of thread breakage and detects an abnormality when the frequency is high. The sewing machine according to claim 1, wherein the sewing machine is configured to notify. 3. The abnormality detecting means includes a thread breakage sensor for detecting a yarn supply abnormality to the needle bar, and the history data processing means calculates a frequency of thread breakage occurrence for each sewing operation condition to generate a thread breakage. 3. The sewing machine according to claim 1, wherein the sewing operation is controlled so as to reduce the number of sewing operations. 4. The abnormality detecting means comprises a yarn break sensor for detecting a yarn supply abnormality to a needle bar, and the history data processing means calculates a yarn break occurrence based on a result of calculating a frequency of the yarn break occurrence. The sewing machine according to any one of claims 1 to 3, wherein the sewing machine is configured to perform a calculation for predicting a sewing time in consideration of a possibility.