JPH1033866A - Sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manage the number of times of thread breakage for the small number of sewing machines without the need of performing centralized management and to facilitate maintenance or the like while suppressing a cost to be low. SOLUTION: When a thread breakage detection timing comes, a sewing machine controller 100 outputs operation signals to thread breakage detectors 10A, 20A,..., Z0A. The thread breakage detectors 10A or the like receive pin signals outputted from sewing machine heads 10, 20,..., Z0 and output detection signals including the presence/absence of thread breakage generation. The sewing machine controller 100 receives the detection signals outputted from the thread breakage detectors 10A or the like, and in the case of the thread breakage generation, counts the number of times of the thread breakage for each needle bar (or for each sewing machine head 10 or the like) and displays it at a display device 116. In such a manner, the number of times of the thread breakage is managed for the small number of these sewing machines without the need of performing the centralized management and the cost is suppressed to be low. Since the number of times of the thread breakage is displayed at the display device 116, the maintenance or the like is easily performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing machine provided with a thread breakage detecting device, and relates to a technique for displaying the number of times of thread breakage occurring during sewing.

[0002]

2. Description of the Related Art In a sewing machine, thread breakage may occur during sewing due to operation timing of a balance, tension applied to an upper thread and a lower thread, and the like. If such thread breaks occur frequently, the production efficiency is reduced. Therefore, it is necessary to grasp the number of thread breaks and perform maintenance or the like. A system for managing the number of thread breaks is disclosed in Japanese Patent Laid-Open No. 7-194.
No. 880 discloses this. In the system disclosed in this publication, a plurality of sewing machines are connected to one host computer via communication means. Each of the plurality of sewing machines is provided with a thread break detecting device for detecting a thread break for each needle bar (or for each sewing head). The host computer displays the number of thread breaks detected by the thread break detection device, that is, the number of thread breaks, on a display device for each needle bar (or for each sewing machine head) for each sewing machine to facilitate maintenance and the like. I have.

[0003]

However, if this system is applied to a small number of sewing machines that do not need to be centrally managed, the cost will increase because communication means and a host computer must be provided. The present invention has been made in view of such a point, and by controlling the number of times of thread breakage for a small number of sewing machines that do not need to be centrally controlled, a sewing machine that is easy to maintain while keeping costs low. The realization is a first object. In addition to the first object, a second object is to manage the number of thread breaks for each needle bar, for each sewing head, or for each of the upper thread and / or the lower thread in order to subdivide the management. . Furthermore, in addition to the first object, a third object is to diversify the display mode of the number of times of thread breakage for easy viewing.

[0004]

A first aspect of the present invention corresponds to a first object, and a thread breakage detecting means for detecting a thread breakage and a thread breakage detected by the thread breakage detecting means. It is characterized by having counting means for counting the number of thread breaks, and display means for displaying the number of thread breaks counted by the counting means on a display device. According to the invention as set forth in claim 1, the counting means counts the number of times of yarn breakage detected by the yarn breakage detection means,
The display means displays the number of thread breaks on a display device. Since the number of times of thread breakage is controlled in this way, maintenance and the like can be easily performed on a small number of sewing machines that do not need to be centrally controlled, while keeping costs low.

[0005]

According to a second aspect of the present invention, there is provided a sewing machine according to the first aspect, wherein the display means comprises: The number of thread breaks for each needle bar is displayed. According to the second aspect of the present invention, since the display means displays the number of thread breaks for each needle bar, it is possible to specify which needle bar is likely to cause thread breakage.

[0006]

According to a third aspect of the present invention, there is provided a sewing machine according to the first aspect, wherein the display means comprises a sewing machine. The number of times of thread breakage for each head is displayed. According to the third aspect of the present invention, since the display means displays the number of thread breaks for each sewing head, it is possible to specify which sewing head is likely to cause thread breakage.

[0007]

A fourth aspect of the present invention corresponds to a second object, and in the sewing machine according to the first aspect, the thread breakage detecting means includes an upper thread and / or a lower thread. It is characterized by detecting breakage of the lower thread. According to the fourth aspect of the present invention, since the yarn breakage detecting means detects the yarn breakage of the upper yarn and / or the lower yarn, it is specified which of the upper yarn and / or the lower yarn is likely to have the yarn breakage. it can.

[0008]

A fifth aspect of the present invention is directed to a sewing machine according to the first to fourth aspects, wherein the display means includes a counted thread breakage. The display of the number of times can be switched between a digital display mode and an analog display mode.
According to the fifth aspect of the present invention, since the display means is switched between the digital display mode and the analog display mode, the display mode can be switched to an easy-to-see display mode, and the number of thread breaks can be quickly confirmed.

[0009]

According to a sixth aspect of the present invention, there is provided a sewing machine according to the first to fourth aspects, wherein the display means includes a digital display mode or an analog display mode. The number of thread breaks is displayed in a display mode. According to the invention described in claim 6, the display means displays the number of thread breaks in a digital display mode or an analog display mode, so that the occurrence state of the thread break can be grasped as a whole.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. In one embodiment, the present invention is applied to a sewing machine having a plurality of sewing heads. Each of the sewing heads has a plurality of needle bars.

First, the configuration of the sewing machine of the present invention will be described with reference to FIG. FIG. 1 is a block diagram showing the overall configuration of the present invention. The sewing machine according to the present invention includes sewing machine heads 10, 20,..., Z0, and thread breakage detecting devices 10A, 20.
A,..., Z0A, and a sewing machine control device 100 are provided.
Each of the sewing heads 10, 20,..., Z0 outputs a pin signal indicating whether or not a thread break has occurred. Each of these sewing heads 10, 20,..., Z0 has the same configuration, and includes a plurality of needle bars 16 (six in the example of FIG. 2). Thread break detection devices 10A, 20
, Z0A have the same configuration, and are provided corresponding to the sewing machine heads 10, 20,..., Z0. Thread break detectors 10A, 20A, ...,
.., Z0 correspond to the corresponding sewing heads 10, 20,.
And the operation signal output from the sewing machine control device 100 to determine whether or not a thread break has occurred, and outputs the determination result to the sewing machine control device 100 as a detection signal.

Next, a specific configuration of the sewing machine head and the thread breakage detecting device will be described with reference to FIG.
FIG. 2 shows a configuration of the sewing machine head and the thread breakage detecting device. Here, the sewing heads 10, 20,..., Z0 have the same configuration. Also, each of the sewing heads 10, 20,.
Each of the yarn breakage detecting devices 10A, 20A,.
Z0A has the same configuration. Therefore, in order to simplify the description, the following description will be made based on the sewing head 10 and the thread breakage detecting device 10A. Thread break detection device 10A
Is composed of a determination circuit 12A and an output circuit 14A. The discriminating circuit 12A includes a pin signal output from the sewing machine head 10 and an operation signal output from the sewing machine controller 100 (that is, a needle position signal and a timing signal).
In response to this, the presence or absence of thread breakage (and any needle bar 1
6 to determine whether a yarn break has occurred) and output a determination signal. The output circuit 14A receives the determination signal output from the determination circuit 12A and outputs a detection signal to the sewing machine control device 10A.
Output to 0. This detection signal is a digital signal, and indicates whether a thread break has occurred, a unique identification code for each needle bar,
Data such as a unique identification code is added to each sewing head. Based on these data, the sewing machine control device 100
Can identify which yarn break detecting device and which needle bar caused the yarn break.

On the other hand, the sewing machine head 10 has a function of guiding a sewing thread to a sewing needle 17 and a function of giving tension to the sewing thread. ing. Thread tensioner 1
The needles 1 and 12 are provided corresponding to the respective needle bars 16, and the strength of the tension applied to the sewing thread can be adjusted by turning the knob. Note that the thread tensioner 12 further includes a thread take-up spring 13, and is configured to output a pin signal by the operation of the thread take-up spring 13. The balance 14 moves up and down in accordance with the rotational movement of the main shaft 15 of the sewing machine, and applies a tension such that the sewing thread stitched to the workpiece is not loosened. The sewing machine spindle 15 is connected to a sewing machine spindle motor (not shown, hereinafter simply referred to as “motor”), and the rotation of this motor is controlled by the sewing machine control device 100. Needle bar 16 has
A sewing needle 17 is provided.

Here, the fact that the pin signal follows the operation of the thread take-up spring 13 will be briefly described. The thread take-up spring 13 has a portion through which a sewing thread is passed. The thread is passed through the portion and guided to the balance 14. When the balance 14 moves up and down, the movement reciprocates the thread take-up spring 13 through the sewing thread against its elastic force. During this reciprocating movement, the thread take-up spring 13 comes into contact with or separates from a detection member (not shown) provided inside. As described above, the output pin signal is turned on or off depending on the presence or absence of contact between the thread take-up spring 13 and the detection member. Therefore, when the output pin signal is turned on during a period in which the output pin signal is normally off (hereinafter, referred to as a “detection period”), it can be determined that a thread break has occurred. In the determination of the thread breakage, there is a mode in which on and off are reversed depending on the structure of the thread take-up spring 13 and the detection member.

Next, the configuration of the sewing machine control device 100 will be described with reference to FIG. The sewing machine control device 100 has a function of counting the number of thread breaks and displaying the count on a display device.
M102, RAM 112, output processing circuit 104, input processing circuit 106, display control circuit 114, display device 116,
It is constituted by an operation panel 118. CPU110
Controls the entire sewing machine according to a sewing machine control program stored in the ROM 102. The sewing machine control program includes various programs for thread breakage detection processing shown in a flowchart described later. ROM102
Is an EPROM, but an EEPROM or a flash memory may be used. The RAM 112 stores various data such as the number of thread breaks, a display flag, a display method flag, a detection signal, and an encoder counter. This RA
Although a DRAM and an SRAM are used for the M112, a flash memory, a storage medium stored in an external storage device (for example, a hard disk or a flexible disk), or the like may be used.

The output processing circuit 104 outputs an operation signal to the yarn breakage detecting devices 10A, 20A,..., Z0A according to the output data sent from the CPU 110 via the bus 108. The input processing circuit 106 receives the detection signals output from the yarn breakage detecting devices 10A, 20A,..., Z0A, and sends them to the CPU 110 or stores them in the RAM 112 or the like. The operation panel 118 is a device for inputting various commands to the sewing machine control device 100 by the operator, numerical values set in advance, and the like. As the operation panel 118, for example, a touch panel, a keyboard, or the like, which is attached (or built-in) to the display device 116 and instructs the operator by touching its surface, is used. Note that a pointing device (for example, a mouse or the like) may be used instead of the touch panel and the keyboard. The display control circuit 114 displays the number of thread breaks on the display device 116 according to display data sent from the CPU 110 or the like via the bus 108. Although a liquid crystal display device is used as the display device 116, a CRT, a 7-segment LED, or the like may be used. Note that each of the above-described components is a bus 10.
8 are connected to each other.

In displaying the number of thread breaks in the sewing machine having the above configuration, the processing shown in FIGS. 3 to 8 is performed in the sewing machine control device 100. All of these processes are realized by the CPU 110 executing the sewing machine control program. Here, FIG. 3 is a flowchart showing a main process, FIG. 4 is a flowchart showing a spindle stop process, FIGS. 5 and 6 are a flowchart showing a spindle operation process, FIG. 7 is an interrupt process, and FIG. . In these figures, when a flag or a signal is on, “O”
N ", and" OFF "when off.

First, in the main processing shown in FIG. 3, an initial routine is executed [Step S10]. In this routine, the microcomputer CPU is initialized and a working area (for example, a display flag is turned off) in the storage element RAM 112 is cleared. Next, a sewing machine spindle stop routine is executed [Step S1]
2]. FIG. 4 shows the specific processing contents of this routine.
This will be described with reference to FIG.

In FIG. 4, first, a sewing machine spindle stop initial routine is executed [step S20]. In this routine, the microcomputer CPU clears the working area in the storage element RAM 112 when the sewing machine spindle is stopped. Next, the operator operates the operation panel 118.
It is determined whether or not the display method setting of the number of times of thread break has been instructed from [Step S22]. Specifically, the display switching key 202 on the display device with a touch panel 116 shown in FIG.
Is determined based on whether or not is pressed. The display switching key 202 is pressed once to display a command for displaying in a graph format (analog display mode, hereinafter referred to as "graph display"), and is pressed again to display numbers in a table format (digital display mode, digital display mode). Hereinafter, this is referred to as "numerical display.") Here, when the display method setting (graph display or numeric display) is instructed by pressing the display switching key 202 (YES), it is further determined whether or not the display is set to the graph display (step S24). If a graph display is instructed (YES), the display method flag is turned on [Step S28], and if a numerical display is instructed (NO), the display method flag is turned off [Step S26].

When the display method setting is not instructed in step S22 (NO), or after the display method flag is set [steps S26 and S28], a thread breakage number display routine is executed [step S30]. The specific processing content of this routine will be described with reference to FIG. In FIG. 8, first, it is determined whether or not the current number of thread breaks is being displayed (step S90). If it is not being displayed (NO), it is determined whether or not the number of thread breaks is displayed based on the display flag [ Step S92]. That is, it is determined whether the display flag is on or off. If the display flag is off (NO), the display routine of FIG. 8 ends.

If the display flag is on (YES) in step S92, the display method flag is determined [step S94]. In this case, the display method flag is turned on (YE
If S), the number of thread breaks is displayed in a graph as shown in FIG. 11A [Step S96]. If the display method flag is off (NO), the number of times of thread breakage is displayed by a numerical display as shown in FIG.
8]. Here, in the graph display shown in FIG. 11A, (1
-24) The number of thread breaks for each of the upper and lower threads is displayed. In the numerical display shown in FIG. 11B, the number of thread breaks for each needle bar in the column direction and for each sewing machine head in the row direction are displayed in the display area 200. In these figures, a display screen 116a is an example of a screen displayed on the display device 116 shown in FIG. The total count display 204 displays the total value of the number of thread breaks displayed in the display area 200. The clear key 206 is a key for clearing the number of thread breaks displayed in the display area 200 and the total count display 204. The close key 208 is a key for ending the display of the number of times of thread breakage. The display of the number of times of thread breakage is not limited to the mode shown in FIG.
Graphs or numbers can be arbitrarily displayed for each needle bar and each sewing head. That is, the identification code included in the detection signal is data for identifying the upper thread, the lower thread, the needle bar, the sewing head, and the like, and the number of times of thread breakage is counted according to the data.

In the state where the number of thread breaks is displayed in step S90 (YES) or after the number of thread breaks is displayed [steps S96 and S98], it is determined whether or not the number of thread breaks is cleared to zero [step S90]. S100]. In particular,
It is determined whether or not the operator has pressed the clear key 206 shown in FIG. If the clear key 206 is depressed (YES), the number of thread breaks stored in the RAM 112 is cleared to zero and [Step S10
2], the number of thread breaks is all changed to zero and redisplayed [step S104].

If the number of times of thread breakage is not cleared to zero in step S100 (NO), or after redisplaying in step S104, it is determined whether or not display of thread breakage information is terminated [step S106]. Specifically, it is determined whether or not the operator has pressed the close key 208 shown in FIG. If the close key 208 has been pressed (YES), the display flag is turned off and the display of the number of times of thread breakage ends (step S108). Also,
If the display of the thread breakage information is not ended in step S106 (NO), or after the display of step S108 is ended, the thread breakage number display routine is ended.

Returning to FIG. 4, after executing the thread breakage number display routine of step S30, the sewing machine (for example, an embroidery machine)
Control process and other stop processes [Step S
32]. As the stop processing, for example, color change control, or when a display switch of the number of times of thread breakage is instructed by an operator, a display flag is set to ON, and the like. Then, it is determined whether or not the operator has instructed the data set from the operation panel 118 (step S34). If the data set has been instructed (YES), the pattern information is registered [step S36]. This data set is a command for specifying embroidery data that forms a pattern when sewing such as embroidery is performed. Further, the state of the operation switch is determined [Step S38]. If the operation switch is off, the process returns to Step S22 to repeatedly execute the sewing machine spindle stop routine. On the other hand, if the operation switch is on, the sewing machine spindle stop routine ends and the routine returns.

Returning to FIG. 3, after finishing the sewing machine spindle stop routine in step S12, the sewing machine spindle operation routine is executed [step S14]. The specific processing content of this routine will be described with reference to FIGS. In FIG. 5, first, a sewing machine spindle operation initial routine is executed [Step S40]. In this routine, the working area in the RAM 112 is initialized, and the clock interrupt and the origin interrupt of the rotary encoder are set. Then, the operation of the sewing machine spindle 15 is started by driving the motor [Step S
42].

Next, until the stop request flag is turned on (step S44), the thread breakage number display routine [step S56] and various interrupt routines [step S4]
6], the spindle encoder origin interrupt routine [Step S50] and the like are appropriately executed. At this time, the stop request flag is turned on when the stop switch is turned on, when the thread breakage detection flag is turned on, or when a stop / end code error is turned on [step S48, S54]. The stop switch is turned on when the operator presses a stop switch provided on the sewing machine. The thread breakage detection flag is turned on when the detection signal shown in FIG. 2 is turned on. Further, the stop / end code error is turned on when the sewing command program is ended. Further, in the thread breakage number display routine of step S56, steps S90 to S108 shown in FIG. 8 are executed as described above.

Here, various interrupt routines shown in step S46 will be described with reference to FIG. In FIG. 7, first, it is determined whether or not it is the thread breakage detection timing (step S80). The thread break detection timing is a timing when the pin signal output from the sewing head 10 is normally turned off. The details will be described later (description of FIG. 9).

If it is the thread break detection timing (YES in step S80), the thread break detection device 10
A is output to A, and a detection signal output from the yarn breakage detecting device 10A is received. Then, it is determined whether or not the received detection signal is ON, that is, whether or not a thread break has occurred [Step S82]. If the detection signal is on (YES), the thread break detection flag is turned on [step S84]. And
If it is not the thread breakage detection timing (N in step S80)
O) or when the thread break signal is off (N in step S82).
O) Or, after executing step S84, other interrupt processing is performed [step S86], and the processing in FIG. Other interrupt processing includes, for example, controlling the movement of the embroidery frame, and setting the display flag to ON when the display switch for the number of thread breaks is commanded by the operator.

Returning to FIG. 5, the origin interrupt routine of step S50 performs a process of resetting the encoder counter to zero. This encoder counter has a function of counting pulse signals output from a rotary encoder provided in the motor.

When the stop request flag is turned on [YES in step S44], control is performed to decelerate the motor and stop it at a fixed position [step S5].
2, S58]. Until the sewing machine spindle 15 reaches the home position, the above-described processing of steps S44 to S56 is repeated. On the other hand, when stopping at the fixed position in step S58, the process proceeds to FIG. 6, and the stop request flag is turned off [step S60].

Then, it is determined whether or not a thread break has occurred, that is, whether or not a thread break detection flag has been turned on (step S62). If the thread break detection flag is ON (YES), the number of thread breaks stored in the RAM 112 is counted up by one [Step S6].
4]. At this time, if the number of thread breaks is being displayed [YES in step S66], the displayed number of thread breaks is updated and displayed [step S68]. Thereafter, the thread breakage detection flag is turned off in preparation for the next thread breakage detection [Step S70], and the sewing machine main operation routine is terminated and the routine returns. On the other hand, if the thread breakage detection flag is turned off in step S62 (NO), the sewing machine spindle operation routine ends without any processing, and the process returns. Thus, the process returns to step S12 shown in FIG.

By executing the above various routines, the number of thread breaks detected by the thread break detecting device 10A (thread break detecting means) is counted (step S64 in FIG. 6), and the counted number of thread breaks is displayed. Device 116
[Steps S96 and S98 in FIG. 8]. Therefore, the number of times of thread breakage can be managed, and maintenance can be easily performed while keeping costs low. In the multi-needle sewing machine and the multi-head sewing machine, the number of thread breaks displayed on the display device 116 is performed for each needle bar and for each sewing head [steps S96 and S98 in FIG. 8]. Therefore, it is possible to specify which needle bar or sewing head is likely to cause thread breakage. Further, the yarn breakage detecting device 10
A detects the breakage of the upper thread and the lower thread, and displays the number of thread breaks for each of the upper thread and the lower thread on the display device 116 (steps S96 and S98 in FIG. 8). Therefore, it is possible to specify which of the upper thread and the lower thread is likely to be broken. The display mode of the number of times of thread breakage is switched between the digital display mode and the analog display mode by the display switching key 202 [Step S24 in FIG. 4, Step S94 in FIG. 8].
For this reason, the number of thread breaks can be quickly confirmed in an easily viewable display mode. Then, since the number of thread breaks is displayed in the digital display mode [step S98 in FIG. 8] or the analog display mode [step S96 in FIG. 8], the occurrence state of the thread break can be grasped as a whole. With the above function, a portion where the yarn breakage is likely to occur can be specified, so that the maintenance becomes easy.

Next, the relationship between the chronological change in the signal processed in the yarn breakage detecting device 10A and the above-mentioned various routines will be described with reference to FIG. “Needle 1, needle 2” shown in FIG.
It points to the 0 needle bar. Similarly, the "operation switch"
Means a switch for an operator to issue a sewing command, and is provided on the operation panel 118. "Encoder"
Means a pulse signal output from a rotary encoder provided in the motor. The “rotary encoder Z signal” is output when the main shaft of the motor that rotates the main shaft 15 of the sewing machine reaches a predetermined angle (at times t16 and t2 in the figure).
0, t24, etc.). “Detection timing” indicates a detection timing signal synchronized with the pulse signal, and corresponds to the “timing signal” shown in FIG. “Yarn breakage detection” indicates the above detection signal. When the main shaft 15 of the sewing machine is stopped (before time t12 or after time t28 in the figure), the main shaft of the motor is locked at the above-mentioned predetermined angle, so that it is turned on.

At time t10, the needle bar of the sewing head 10 is switched from the needle 1 to the needle 2. Time t12
When the operation switch is turned on, a pulse is output from the rotary encoder. In the figure, the signal is shown as being on, but actually, a fine pulse is output intermittently. When the operation switch is turned on, the thread breakage detection signal is forcibly reset to off. Then, the rotation of the sewing machine main shaft 15 (that is, the motor) is slow until the rotary encoder Z signal is output by the predetermined number of pulses for the switched needle 2, so that the detection timing signal is not output. The period during which this detection timing signal is output (for example, from time t18 to t19, t22)
To t23) is the detection period. This detection timing signal is output from the sewing machine control device 100 [the timing signal shown in FIG. 2, between steps S80 and S82 in FIG. 7]. If a yarn break occurs (time t24 to t24 in the figure)
During 26), the pin signal remains on. for that reason,
At time t26 when the detection timing signal is output, the pin signal is on, so the detection signal also turns on at time t26. When the detection signal is turned on, [Step S8 in FIG.
2], the thread breakage detection flag is set to ON (step S84 in FIG. 7). The thread breakage detection flag is determined, and the number of times of thread breakage is counted [step S64 in FIG. 6]. The counted number of thread breaks is displayed on the display device 116 [steps S96 and S98 in FIG. 8].

The reason why the detection timing signal is output is as follows. That is, normally, in this period, a tension is applied to the sewing thread, and the pin signal is turned off. If the pin signal is ON, it means that no tension is applied to the sewing thread, and it can be determined that the sewing thread is broken. On the other hand, normally, even if the inspection is performed at the time when the pin signal is turned on, the tension is not applied to the sewing thread, and the pin signal is always turned on, and it is not possible to determine whether or not the thread is broken. Note that the detection timing signal is not limited to one pulse as shown in one detection period, and may output a plurality of pulses of two or more pulses. Depending on the behavior of the sewing thread, the pin signal may change by accident. By performing inspection using a plurality of pulses, it becomes possible to determine the thread breakage more accurately. Further, the detection timing signal may be output immediately after the operation switch is pressed to determine whether there is a thread break.

According to the above embodiment, when the thread breakage detection timing (detection period) is reached, the sewing machine control device 100
Outputs an operation signal to the yarn breakage detecting devices 10A, 20A,..., Z0A. The yarn break detecting devices 10A, 20
A,..., Z0A are corresponding sewing machine heads 10, 20,.
.., Z0, and outputs a detection signal including the presence / absence of thread breakage. Further, the sewing machine control device 100 receives a detection signal output from the thread breakage detecting device 10A or the like and, in the case of a thread breakage, for each of the needle bars (in addition to each of the upper and lower threads, or the sewing heads 10, 20,. …, Z
The number of times of thread breakage (every 0) is counted and displayed on the display device 116. In this way, the number of times of thread breakage is managed for a small number of sewing machines that do not need to be centrally managed, and the cost can be kept low. In addition, the number of times of thread breakage
6, maintenance and the like are facilitated.

[Other Embodiments] The structure, shape, size, material, number, arrangement, operating conditions and the like of other parts of the sewing machine described above are not limited to the above-described embodiment. For example, each of the following embodiments to which the above embodiment is applied may be implemented. (1) The number of thread breaks [steps S96 and S98 in FIG. 8] displayed on the display device 116 may be sorted and displayed in ascending or descending order. In addition, it can be displayed in different shades for each needle bar, sewing machine head, etc.
The display may be color-coded. By doing so, it is possible to recognize at a glance which needle bar, sewing machine head, or the like, in which thread breakage frequently occurs. (2) The graph display as the analog display mode is shown in FIG.
Not only the bar graph shown in (A) but also other graph displays such as a pie graph and a line graph may be displayed. By displaying the number of thread breaks in a display mode that is easy for the operator to see, it is possible to easily recognize which needle bar, sewing machine head, or the like has a large number of thread breaks.

(3) FIG. 10 in which display modes are sequentially switched
May be provided in place of the display switching key 202 shown in FIG. For example,
As shown in FIG. 12, a non-display key 210 for instructing the display of the number of times of thread breakage, and a graph display key 2 for instructing the graph display
12. A numeric display key 214 for instructing numeric display is provided. That is, when the operator touches the touch panel corresponding to each key portion displayed on the display screen 116a, a command of the key is input to the sewing machine control device 100. According to this configuration, the number of thread breaks in a desired display mode can be displayed with one touch. (4) Along with the display of the number of times of thread breakage, the maintenance content corresponding to the number of times of thread breakage may be displayed simultaneously or independently. Specifically, a table corresponding to the number of times of thread breakage for each of the upper and lower threads, each of the needle bars, and each of the sewing heads is provided, and maintenance contents are set in the table. For example, a message "Adjust the needle hook timing" is set in the above table in correspondence with the thread breakage of 10 times for a certain needle bar. Then, the maintenance contents are displayed in steps S96 and S98 in FIG. According to this display, even a person with little maintenance experience can perform appropriate maintenance of the sewing machine.

(5) The display of the number of thread breaks of the sewing machine head may be switched by a changeover switch or the like for each of the upper and lower threads, each of the needle bars, and the like. Alternatively, an arbitrary number of display modes may be displayed simultaneously on one screen. By doing so, the occurrence state of the thread breakage, that is, the state of the sewing machine can be grasped more quickly. (6) In the sewing machine heads 10, 20,..., Z0, the pin signal is output by the thread take-up spring 13, but the sewing thread is irradiated with a laser to output a pin signal depending on the presence or absence of reflected light, or the pin signal is output by a microswitch. May be output. This makes it possible to more accurately determine the presence or absence of a thread break.

[0040]

Other Embodiments The embodiments of the present invention have been described above. This embodiment has aspects of the invention other than the aspects of the invention described in the claims.
Embodiments of the present invention will be enumerated below, and related explanations will be provided as necessary. [Aspect 1] The sewing machine according to claim 1, wherein the display means displays the number of thread breaks counted by the counting means on a display in a graph. [Relevant Description of Aspect 1] According to Aspect 1, the number of times of thread breakage is displayed in a graph, so that the target of the thread breakage occurrence can be recognized at a glance.

[0041]

According to the present invention, for a small number of sewing machines that do not need to be centrally managed, the communication means and the host computer are not required, so that the cost can be reduced. Also, since the number of thread breaks is displayed on the display device,
Maintenance becomes easier depending on the number of times.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the overall configuration of the present invention.

FIG. 2 is a diagram illustrating a configuration of a sewing head and a thread breakage detection device.

FIG. 3 is a flowchart showing a main process.

FIG. 4 is a flowchart showing a spindle stop process.

FIG. 5 is a flowchart showing a spindle operation process.

FIG. 6 is a flowchart showing a spindle operation process.

FIG. 7 is a flowchart showing an interrupt process.

FIG. 8 is a flowchart showing a thread breakage number display process.

FIG. 9 is a time chart showing thread breakage detection.

FIG. 10 is a diagram illustrating an example of a screen displayed on the display device.

FIG. 11 is a diagram showing a display mode of the number of times of thread breakage.

FIG. 12 is a diagram illustrating another example of a screen displayed on the display device.

[Explanation of symbols]

 , Z0 sewing machine head 11, 12 thread tensioner 13 thread take-up spring 14 balance 15 sewing machine spindle 16 needle bar 17 sewing needle 10A, 20A, ..., Z0A thread breakage detecting device 12A, 22A, ..., Z2A discriminating circuit 14A , 24A,..., Z4A output circuit 100 sewing machine controller 102 ROM 104 output processing circuit 106 input processing circuit 108 bus 110 CPU 112 RAM 114 display control circuit 116 display device 118 operation panel

Claims (6)

[Claims] 1. A yarn breakage detecting means for detecting a yarn breakage, a counting means for counting the number of yarn breakages detected by the yarn breakage detecting means, and a yarn breakage number counted by the counting means is displayed on a display device. A sewing machine comprising: display means for displaying; 2. A sewing machine according to claim 1, wherein the display means displays the number of times of thread breakage for each needle bar. 3. A sewing machine according to claim 1, wherein the display means displays the number of times of thread breakage for each sewing machine head. 4. The sewing machine according to claim 1, wherein the thread breakage detecting means detects a thread breakage of the upper thread and / or the lower thread. 5. The sewing machine according to claim 1, wherein the display means is capable of switching the display of the counted number of thread breaks between a digital display mode and an analog display mode. Sewing machine. 6. The sewing machine according to claim 1, wherein the display means displays the number of thread breaks in a digital display mode or an analog display mode.