JPH06101157A - Multihead embroidery machine - Google Patents

Abstract

PURPOSE:To prevent the lowering of the quality of embroidery caused by yarn breakage as far as possible while minimizing the deterioration of the operation efficiency caused by the yarn breakage. CONSTITUTION:When a yarn breakage is detected by a yarn breakage sensor, a controller judges (S91) whether the timing of the yarn breakage is in the initial stage of embroidery work or after the initial stage. If the timing of the yarn breakage is judged to be in the initial stage of the embroidery work (S91: No), the driving of all machine heads is stopped (S92), a mending work is performed (S93) and the embroidery work is restarted (S95). On the contrary, if the yarn breakage is at the final stage of embroidery work (S91: Yes), the driving of the yarn-breakage machine head is exclusively stopped (S96) and the yarn breakage position in the embroidery data of the machine head and the number of the machine head are stored in a RAM (S97). Each embroidery cloth subjected to the interruption of embroidery work is set on each machine head and embroidery work is restarted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-head embroidery sewing machine having a plurality of sewing machine heads and capable of simultaneously performing embroidery forming operations on a plurality of work cloths.

[0002]

2. Description of the Related Art Conventionally, a multi-head embroidery sewing machine of this type is provided with a plurality of sewing machine heads arranged side by side in a lateral direction above a sewing machine table and a movable frame which is long in the lateral direction on the sewing machine table. It is configured. An embroidery frame holding a work cloth is detachably attached to the moving frame in correspondence with each of the sewing machine heads, and the moving frame is moved in the X and Y directions by a horizontal moving mechanism. It can be moved freely.

Then, the control device of the embroidery sewing machine, based on the embroidery data indicating the needle drop position for each stitch (the relative movement amount of the sewing needle for each stitch in the X and Y directions), the moving frame, and thus each embroidery frame. The needle bar of each sewing machine head is vertically moved while moving the machine in the horizontal direction. Thus, the same embroidery corresponding to the embroidery data is simultaneously formed on the work cloth held in each embroidery frame by one sewing operation.

By the way, in this type of embroidery sewing machine, the embroidery thread may break during the sewing operation. Occurrence of such yarn breakage is inevitable for the sewing machine. Therefore, in general, a multi-head embroidery sewing machine is provided with a thread breakage sensor for detecting the occurrence of thread breakage, and when there is a thread breakage, a lamp, a buzzer, or the like is used to notify the thread breakage, and at that time all sewing machines are informed. After the driving of the head is stopped and the operator performs the thread breakage repair work, the sewing work is restarted by operating the return switch.

[0005]

By the way, when the embroidery forming operation is temporarily stopped in the middle of one sewing operation and then the embroidery forming operation is resumed, when the sewing machine head is stopped, the sewing is suddenly performed. Since the speed is decreased, the thread tension is slightly deviated at that portion, and the finished condition of the embroidery is slightly inferior to that obtained when the embroidery forming operation is continuously performed from the beginning to the end.

Therefore, in recent years, when a thread breakage occurs during the sewing operation, only the sewing machine head where the thread breakage occurs is stopped, and the embroidery forming operation is continued for the other sewing machine heads to the end. In the next sewing work,
By leaving the work cloth with the thread breakage in the embroidery frame as it is, the embroidery forming operation of the remaining part of the work cloth with the thread breakage is performed in addition to the embroidery forming operation on the new work cloth. Is considered (Japanese Patent Publication Sho 51-5
1840). According to this, the deterioration of the embroidery quality due to the thread breakage can be limited to the portion where the thread breakage occurs.

However, according to this method, in the case of the sewing machine head in which the thread breakage occurs, the time until the other sewing machine heads finish the embroidery forming operation after the driving is stopped (the embroidery frame is moving, The needle bar is not moving). For this reason, there is a drawback in that the efficiency of the sewing work is deteriorated by the idle time as compared with a case in which the entire embroidery forming operation is temporarily stopped when a thread breakage occurs.

The present invention has been made in view of the above circumstances, and an object thereof is to prevent deterioration of work efficiency due to occurrence of thread breakage as much as possible, and at the same time prevent deterioration of embroidery quality due to occurrence of thread breakage. It is to provide a multi-head embroidery sewing machine that can.

[0009]

In order to achieve the above object, the multi-head embroidery sewing machine of the present invention has a detecting means for detecting thread breakage in each sewing machine head and a position where the thread breakage occurs in the embroidery data. The storage means that stores whether the thread breakage occurs, the determination means that determines whether the thread breakage occurs at the beginning of one sewing operation or after that, and the thread breakage is initially determined based on the determination of this determination means. When the thread breakage occurs, the entire embroidery forming operation is stopped, and when the thread breakage occurs after the initial stage, only the drive of the sewing machine head where the thread breakage occurs is stopped.

[0010]

In general, when a thread breakage occurs at the beginning of the sewing work, if only the driving of the sewing machine head where the thread breakage occurs is stopped, the idle time of the sewing machine head becomes longer and the sewing work The efficiency will be greatly reduced. On the other hand, when a thread breakage occurs near the end of the sewing work, the idle time of the sewing machine head is short even if only the drive of the sewing machine head where the thread breakage occurs is stopped, and the sewing The work efficiency does not deteriorate so much.

According to the multi-head embroidery sewing machine of the present invention having the above structure, when the detecting means detects the thread breakage, the storing means stores the thread breakage occurrence position in the embroidery data in the sewing machine head. However, here, the determination means determines whether the thread breakage has occurred at the beginning of the sewing operation or after that. When the thread breakage occurs at the beginning, the stop control means stops the entire embroidery forming operation, so that the sewing work efficiency does not deteriorate. On the other hand, when the thread breakage occurs at the end of the sewing operation, the drive of only the sewing machine head where the thread breakage has occurred is stopped by the stop control means, so that the sewing work efficiency does not deteriorate so much and the embroidery accompanying the thread breakage occurs. It is possible to prevent the deterioration of quality.

Therefore, even if the occurrence of thread breakage is unavoidable, it is possible to prevent deterioration of sewing work efficiency due to thread breakage,
Further, both conflicting problems of preventing deterioration of embroidery quality due to thread breakage can be solved while balancing.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a multi-needle, 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 this embodiment will be briefly described with reference to FIGS. 3 and 4.

As shown in FIG. 3, the sewing machine main body 1 has a plurality of, for example, twelve sewing machine heads 3 arranged side by side at equal intervals above a sewing machine table 2 which is long in the lateral direction (X-axis direction). It is equipped with. Each sewing machine head 3 is provided with a needle bar case 5 having a plurality of, in this case, six needle bars 4, and the needle bars 4 are supported in the needle bar case 5 so as to be vertically movable side by side. Has been done. The sewing needles attached to the lower ends of the needle bars 4 are supplied with embroidery threads of different types (colors) from thread supply sources (not shown). The twelve sewing machine heads 3 are numbered as No. 1, 2, 3, 4, ... 12 in order from the left, for example.

A spindle motor 6 for rotating a spindle (not shown) at a variable speed is provided below the sewing machine table 2. Although not shown, each sewing machine head 3 is provided with a transmission mechanism that converts the rotation of the main shaft into the vertical movement of the needle bar 4. Further, each sewing machine head 3 is provided with an actuator 7 (shown only in FIG. 4) for connecting and disconnecting the main shaft and the transmission mechanism.

In this case, the driving force of the main shaft is selectively transmitted to only one needle bar 4 out of the six needle bars 4 in the needle bar case 5 for driving. The selection of the needle bar 4 is made by the color changing motor 8. As a result, the type (color) of the embroidery thread is automatically switched, and multicolor embroidery can be formed. When switching the embroidery thread, the thread cutting motor 9
The embroidery thread of the needle after the sewing work is automatically cut by the thread cutting device driven by (see FIG. 4).

The sewing machine head 3 is provided with a known thread breakage sensor 1 corresponding to each needle bar 4 as the detecting means of the present invention.
0 (only shown in FIG. 4) is provided. Although not shown in detail, the thread breakage sensor 10 detects whether or not there is an abnormal supply of the embroidery thread to the sewing needle, depending on whether or not the thread take-up spring (not shown) is displaced. A thread breakage lamp 11 is provided above each sewing machine head 3 to notify the operator of the occurrence of thread breakage.

On the other hand, the sewing machine table 2 is provided with a hook mechanism (not shown) for forming an embroidery stitch on a work cloth in cooperation with the sewing needle, corresponding to each sewing machine head 3. At the same time, the moving frame 12 is provided so as to be movable in the horizontal direction (X-axis, Y-axis direction). This moving frame 12
As shown in FIG. 5, the sewing machine 2 has a rectangular frame shape extending in the lateral direction (X-axis direction) almost completely.

Then, as shown in FIG.
A plurality of (12) embroidery frames 13 are detachably attached to the sewing machine 2 under the sewing machine heads 3. The embroidery frame 13 is configured to hold a work cloth in a stretched state in a frame portion having a rectangular frame shape, for example, by mounting portions 13a extending in the front-rear direction, opposing long side portions of the moving frame 12. By being screwed to the inside of the moving frame 12, the moving frame 12 is supported in a spanning manner. A large number of embroidery frames 13 are prepared in advance so that a plurality of sewing operations can be performed without changing the work cloth.

The moving frame 12 is moved by the moving mechanism to an arbitrary position in the X-axis direction (lateral direction) and the Y-axis direction (front-back direction) based on the XY coordinate system unique to the apparatus. Has become. Although not shown in detail, this moving mechanism includes an X-axis drive motor 14 including a stepping motor.
An X-axis direction moving mechanism 15 having a driving source (see FIG. 4), and a Y-axis direction moving mechanism 17 having a Y-axis driving motor 16 (see FIG. 4) which is also a stepping motor as a driving source.
It consists of As a result, the plurality of embroidery frames 13 are integrally moved by the moving mechanism.

Each of the above mechanisms is equivalent to the control device 18 shown in FIG.
It is controlled by. This controller 18
Is mainly composed of a microcomputer including a well-known CPU 19, ROM 20, RAM 21 and a bus 22 for mutually connecting them. Further, an input interface 23 and an output interface 24 are connected to the bus 22. There is.

As shown in FIG. 4, the output interface 24 includes the spindle motor 6, the X-axis drive motor 14,
Motor drive circuits 25, 26 and 2 for respectively driving the Y-axis drive motor 16, the color changing motor 8 and the thread trimming motor 9.
7, 28 and 29 are connected, and a display device drive circuit 31 for driving a display device 30 such as a CRT display is also connected. Further, the output interface 24 is connected to an actuator drive circuit 32 for operating each of the plurality of actuators 7.

Further, the input interface 23 includes
In addition to the thread break sensor 10, an external storage device 33 including a floppy disk drive for reading embroidery data and the like, a keyboard 34 for an operator to perform various input operations, and the like are connected. In this case, the embroidery data includes needle drop positions for each stitch (X axis of the moving frame 12 for each stitch,
The stitch data for instructing the movement amount in the Y-axis direction includes color change data for instructing the execution of color change, and is stored and given to, for example, a floppy disk.

Then, the control device 18 uses the control program stored in the ROM 20, the embroidery data read in the RAM 21, and the like to determine the spindle motor 6, the X-axis drive motor 14, the Y-axis drive motor 16, and the color. By controlling the replacement motor 8 and the thread trimming motor 9, each embroidery frame 1 can be processed by one sewing operation.
The embroidery forming operation for the plurality of work cloths held in 3 is simultaneously executed.

When the thread breakage sensor 10 detects the occurrence of thread breakage during the embroidery forming operation, the controller 18 generates the thread breakage at which position in the embroidery data, that is, at what stitch number. Whether or not it is stored in the RAM 21. Therefore, the RAM 21 functions as the storage means in the present invention. In this case, as shown in FIG.
a, a stitch data area 21 in which embroidery data is read
b, a thread breakage head information area 21c for storing which thread breakage has occurred in the sewing machine head 3 and a thread breakage needle number information area 21d for storing the number of stitches of thread breakage are provided together with the work area. ing.

In the present embodiment, the control device 18 is
With the software configuration, when a thread break occurs, it is determined whether the thread break occurs at the beginning of sewing work or after that, and when the thread break occurs at the beginning, the entire embroidery forming operation is performed. When the thread breakage occurs thereafter, the actuator 7 is operated to stop only the driving of the sewing machine head 3 where the thread breakage occurs. Therefore, the control device 18 functions as the determination means and the stop control means according to the present invention. The function of each of the above means will be apparent from the following description of the operation.

Next, the operation of the multi-head embroidery sewing machine configured as described above will be described with reference to FIGS. 1, 2 and 7. FIG. 7 shows a specific example of the progress of the embroidery forming operation in order to facilitate understanding of the operation and effect of this embodiment. Here, for simplification of description, No is shown.
As a specific example, embroidery of 10,000 stitches from 0 stitches to 10,000 stitches is carried out for a machine having four sewing machine heads 3 of 1 to No. 4. In the embroidery forming operation progress status column in FIG. 7, the occurrence of thread breakage is represented by a white circle, the solid line (arrow) indicates that the embroidery forming operation is being performed, and the broken line is idle (embroidery frame 13 Indicates that the needle bar 4 is moving but the needle bar 4 is not moving.

Now, the flow chart of FIG. 1 shows the entire procedure of the processing of the sewing work. That is, first, when the power of the sewing machine main body 1 is turned on, desired embroidery data designated by the operator is read into the RAM 21 in step S1. In the next step S2, the screen of the display device 30 displays a selection screen for performing a sewing operation, a re-sewing operation for the work cloth for which the embroidery forming operation has been interrupted, or an end, and the operator The keyboard 34 is operated to make a selection.

Here, when the operator wants to perform a sewing operation on a new work cloth, the operator selects execution of the sewing operation. Then, at step S3, each sewing machine head 3 can be started, and at the same time, at step S4, the variable N
Is assigned to the total number of stitches (total number of stitches) according to the embroidery data. It should be noted that whether or not the sewing machine head 3 can be started in step S3 is determined by a flag and can be started by setting the flag to 1.

Then, the operator sets the embroidery frame 13 holding the work cloth on the moving frame 12 and operates the start key to start the embroidery forming operation (step S5). Then, in step S6, the counter C
1 is substituted for, and subsequently, in the next step S7, the embroidery forming operation of the C-stitch is executed.

This embroidery forming operation is performed in order while incrementing the value of the counter C by 1 (step S10) based on the embroidery data, and the value of the counter C exceeds the variable N (10,000) (at step S11). It becomes Yes) and is repeated. During the embroidery forming operation, when the embroidery data includes color change data, the needle bar 4 is switched by the color change motor 8 and the thread cutting mechanism.

During execution of the embroidery forming operation, the thread breakage sensor 10 constantly monitors the occurrence of thread breakage (step S8). When the occurrence of yarn breakage is detected by the yarn breakage sensor 10 (Yes in step S8), the routine advances to a yarn breakage process routine in step S9.

The flow chart of FIG. 2 shows this step S
9 shows a routine for thread breakage processing of No. 9. That is, when the thread breakage occurs, first, in step S91, it is determined whether the thread breakage occurs at the beginning of the sewing operation or after that. In this embodiment, this determination is made by comparing the total number N of stitches in the embroidery data with the number of stitches when the thread breakage occurs (the value of the counter C), and the value of the counter C is 1/2 of the total number N of stitches. I try to do it depending on whether or not it exceeds. That is, if the value of the counter C is less than or equal to 1/2 of the total number of stitches N (No in step S91), the initial stage, and if it exceeds 1/2 of the total number of stitches N (Yes in step S91), After that, that is, it is determined as the end.

If the value of the counter C is 1/2 or less of the total number N of stitches (No in step S91), the entire embroidery forming operation is stopped in step S92. At this time, the operator is informed of the occurrence of the thread breakage by the thread breakage lamp 11 or the buzzer, and the operator executes the repair work for the needle bar 4 in which the thread breakage has occurred (step S93), and then restarts. (Step S94). Then, the entire embroidery forming operation is restarted from the point where the thread breakage occurred and stopped.

Here, in the concrete example shown in FIG.
In the sewing work of (a), the sewing machine heads No. 1 to No. 4
Shows that the embroidery forming operation is performed on the work cloths A to D (embroidery frame 13), and the sewing work is performed without thread break until the last (10,000 stitches). In the sewing work of (b), while the embroidery forming operation is performed on the work cloths (embroidery frame 13) of E to H by the sewing machine heads 3 of No1 to No4, respectively, the sewing machine head 3 of No2 (F In the case of the processed cloth of No. 1), a thread breakage occurs at the 2000th needle. Here, since the result in Step S91 is No, the entire embroidery forming operation stops at the 2000th stitch number. After that, when the operator performs a repair work and restarts, the embroidery forming operation is restarted from the 2000th stitch as shown in the sewing work of (c).

On the other hand, when thread breakage occurs in the latter half of the sewing operation, that is, the value of the counter C at the time of thread breakage is the total number N of stitches.
If it exceeds 1/2 of the value (Yes at step S91)
s) In the next step S96, only the driving of the sewing machine head 3 where the thread breakage has occurred is stopped, and in the next step S97, the number of stitches at the time of thread breakage (the value of the counter C) is changed to that sewing machine. It is stored in the RAM 21 together with the number of the head 3.

In the example of FIG. 7, the sewing work of (d) corresponds to this. Here, the embroidery forming operations for the work cloths I to L are executed by the sewing machine heads No. 1 to No. 4, respectively, of which, in the sewing machine head 3 of No. 2 (working cloth J), the number of stitches is 7,000 stitches. A break has occurred. Therefore, only the No. 2 sewing machine head 3 is stopped, and the remaining embroidery machine head 3 is not stopped and the embroidery forming operation is performed to the end. In this case, No2
In the sewing machine head 3, the idle time from 7,000 stitches to 10,000 stitches occurs.

When one embroidery forming operation is completed (Yes in step S11), the screen returns to the menu selection screen in step S2, and the operator performs the sewing operation, the re-sewing operation, or the end. The choice is made. Although not shown, if there is a work cloth whose embroidery has been interrupted due to thread breakage during the sewing work at the end of one sewing work, the operator performs the subsequent re-sewing work on the work cloth. Which sewing machine head 3 is to be used is designated and input in advance.

In this case, in the present embodiment, the sewing work is repeated until the number of work cloths for which embroidery is interrupted due to thread breakage is accumulated by the number of sewing machine heads 3 (four in the example of FIG. 7).
Before starting the next sewing work,
The work cloth of the embroidery frame 13 is replaced with a new one (or the embroidery frame 13 with the new work cloth set therein is replaced with the moving frame 12), but at this time, the embroidery is interrupted due to thread breakage. The embroidery frame 13 holding the work cloth is detached from the moving frame 12 and held while holding the work cloth.

After the work cloths for which embroidery is interrupted due to thread breakage are accumulated, the operator selects execution of the re-sewing work in step S2. Then, first, step S
At 12, the start of all sewing machine heads 3 is disabled (the flag is reset to 0). Here, the operator sets the embroidery frames 13 holding the work cloths for which the embroidery forming operation has been suspended, which has been set aside during the previous sewing work, to predetermined positions of the moving frames 12 (corresponding to the respective specified sewing machine heads 3). Then, the embroidery forming operation is started (step S13).

Then, first, in step S14, 1 is substituted into the counter C. At this point, all the sewing machine heads 3 are still unstartable, and the next step S1
At 5, it is judged whether or not there is a thread breakage at the Cth stitch of the number of stitches in the stored re-sewing data, and if there is a thread breakage at the Cth stitch of stitches (Y at step S14
es) only, in step S16, the sewing machine head 3
That is, only the sewing machine head 3 on which the thread-broken work cloth is set at the Cth stitch is ready to start (flag is set) for the first time. Along with this, assuming that the value of the counter C when passing through step S16 for the first time is C0, the value of (N-C0) / 2 + C0 is calculated in step S17 and is substituted into the variable M. There is.

In the next step S18, the embroidery forming operation of the C-stitch is performed, but this embroidery forming operation is performed only for the sewing machine head 3 which can be started, and the sewing machine head 3 which is not so. Remains stopped.
Further, when all the sewing machine heads 3 are incapable of starting, that is, in the state in which the answer is never Yes in step S15, the moving operation of the moving frame 12 is not performed, and the embroidery data is simply fed. It will be only. This process is also performed in order while incrementing the value of the counter C by 1 (step S21), and the value of the counter C is the variable N (10,000).
Is repeated (Yes in step S22).

In the example of FIG. 7, the sewing operation (e) corresponds to this re-sewing. Here, in addition to the work cloth of J above in which the thread breakage occurred at the 7,000th stitch,
Embroidery was interrupted at the 500th and 8500th stitches M, N,
The work cloth of O is set corresponding to the sewing machine heads 3 of No1 to No4.

Of the four work cloths, the yarn breakage occurs earliest when the number of stitches of the work cloth of J is 7,000. Therefore, the sewing machine head 3 and the movement are moved until the value of the counter C reaches 7,000. The frame 12 does not operate, and the value of the counter C is 70
When it becomes 00 (Yes in step S15), N
Only the sewing machine head 3 of o1 can be started (step S
16), the embroidery forming operation is restarted from the 7,000th stitch on the work cloth J. In this case, the time required for jump feed of embroidery data is extremely short, and
The movement of the moving frame 12 to the position of the 7,000th stitch is also instantaneously performed. In this case, the variable M is 850
0 is substituted.

Then, the embroidery forming operation starts from the 7,000th stitch, and the counter C shows 7500 (7500th stitch).
Then, the driving of the No. 3 sewing machine head 3 corresponding to the N work cloth is started, and at the 8000th stitch, the driving of the No. 2 sewing machine head 3 corresponding to the M work cloth is started and the 8500th stitch. When it becomes, No corresponding to the O work cloth
The driving of the sewing machine head 3 of No. 4 is started, and the embroidery forming operation up to the end (10,000 stitches) is executed. In this case as well, there is free rotation, but the time is extremely short.

Although a detailed description is omitted, even during the embroidery forming operation, the thread break sensor 10 constantly monitors whether or not a thread break occurs, as in steps S8 and S9 during the sewing operation. (Step S19) If thread breakage occurs (Yes in Step S19)
s), in step S20, the same thread breaking process as in step S9 is executed. Although not shown,
In the yarn breakage process of step S20, the above step S
At the place corresponding to 91, the value of C is compared with the value of the variable M instead of comparing the value of C with N / 2.

As described above, according to this embodiment, even if the occurrence of thread breakage is unavoidable, when the thread breakage occurs at the beginning of the sewing operation, the entire embroidery forming operation is stopped. The sewing machine head 3
As compared with the case where only the driving of the sewing machine is stopped and the embroidery forming operation is continued, the sewing machine head 3 is not idled and the sewing work efficiency is not deteriorated.

When the thread breakage occurs after the initial stage of the sewing operation, only the driving of the sewing machine head 3 where the thread breakage occurs is stopped and the embroidery forming operation is continued, so that the thread breakage occurs. It is possible to prevent the quality of embroidery from being deteriorated as much as possible. In this case, with respect to the sewing machine head 3 in which the thread breakage occurs, idle time occurs, but since the idle time is short, it is possible to prevent deterioration of the sewing work efficiency so much.

Here, especially in this embodiment, since the work cloths in which the thread breakage has occurred at the same position are collectively re-sewn, the idle time during the re-sewing work is extremely small. It can be completed in a short time, and it is possible to more effectively prevent the work efficiency from being deteriorated.

As a result, unlike the conventional one in which the entire machine is unconditionally stopped when a thread breakage occurs, or the drive of only the sewing machine head where the thread breakage occurs unconditionally is stopped. Prevention of deterioration of sewing work efficiency,
In addition, the contradictory problems of preventing the deterioration of the quality of embroidery due to thread breakage could be solved in a balanced manner.

In the above embodiment, the judgment as to whether thread breakage has occurred at the beginning of sewing or after that is compared with the total number N of stitches in the embroidery data and the number of stitches at the time of thread breakage. Then, the determination is made depending on whether or not the number of stitches exceeds 1/2 of the total number of stitches N, but the setting of the judgment criteria such as whether or not the number of stitches exceeds 1/3 of the total number of stitches N can be appropriately changed. Further, instead of the judgment based on the number of stitches, a modification may be considered in which, for example, the time required for the entire embroidery forming operation (estimated sewing time) is compared with the time when the thread breakage occurs and the judgment is made.

In addition, the present invention is not limited to the above-described embodiments, for example, the invention may be applied to a single-needle type embroidery sewing machine, and various modifications may be made without departing from the scope of the invention. be able to.

[0053]

As is apparent from the above description, according to the multi-head embroidery sewing machine of the present invention, when the thread breakage occurs in the initial stage, the entire embroidery forming operation is stopped and the thread breakage occurs after the initial stage. When this happens, only the drive of the sewing machine head where the thread breakage occurs is stopped, so even if there is a situation in which the thread breakage is unavoidable, while suppressing the deterioration of work efficiency due to the occurrence of the thread breakage as much as possible. Also, it is possible to prevent the deterioration of embroidery quality due to the occurrence of thread breakage as much as possible.

[Brief description of drawings]

FIG. 1 is a flow chart showing a processing procedure in a sewing work according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a routine for thread breakage processing.

FIG. 3 is a perspective view showing the overall appearance.

FIG. 4 is a block diagram showing an electrical configuration.

FIG. 5 is a plan view showing a moving frame.

FIG. 6 is a diagram conceptually showing the contents of RAM.

FIG. 7 is a diagram showing an example of the progress of the embroidery forming operation.

[Explanation of symbols]

In the drawings, 1 is a sewing machine main body, 3 is a sewing machine head, 4 is a needle bar,
6 is a spindle motor, 7 is an actuator, 10 is a thread break sensor (detection means), 12 is a moving frame, 13 is an embroidery frame, and 15
Is an X-axis direction moving mechanism, 17 is a Y-axis direction moving mechanism, 18 is a control device (determination means, stop control means), 19 is a CPU,
20 is a ROM, 21 is a RAM (storage means), 30 is a display device, 33 is an external storage device, and 34 is a keyboard.

Claims (1)

[Claims] 1. An embroidery machine having a plurality of sewing machine heads having needle bars and a moving mechanism for integrally moving a plurality of embroidery frames holding work cloths corresponding to the respective sewing machine heads. An embroidery forming operation for a plurality of work cloths is simultaneously performed by one sewing operation by moving the sewing machine heads while moving the embroidery frame based on the data. Detecting means for detecting thread breakage in the head, storage means for storing at which position in the embroidery data thread breakage has occurred, and thread breakage occurring at the beginning of one sewing operation or thereafter Based on the judgment means for judging whether the thread breakage has occurred, when the thread breakage occurs in the initial stage, the entire embroidery forming operation is stopped, and when the thread breakage occurs after the initial stage, the thread breakage occurs. Multi-head type embroidery machine, characterized by comprising to a stop control means for stopping the drive only machine head was.