JPH10146486A - Sewing machine with spindle and rotating hook driven separately - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the need of skill and much labor in the adjustment of synchronization between the main spindle and the rotating hook for a thread loop, in the case of assembling and repairing of a type of sewing machine whose spindle and the rotating hook are independently driven. SOLUTION: The machine is capable of selecting, through a menu on the screen of the display 16a, 'collection and storage of diagnostic data' for synchronization control, 'display of diagnostic data' so collected, and 'analysis of diagnostic data'. In the collection and storage of the diagnostic data, different kinds of diagnostic data can be collected and stored, for example, by each number of stitch, by the prescribed number of stitch in each seam design, and by each synchronization control. The diagnostic data are those of the number of stitch, rotation angle of the upper shaft and of lower shaft, and the deviation of the rotation angle; these diagnostic data can be displayed in the form of a table as well as in a statistically processed form.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spindle hook separating drive type sewing machine which drives a spindle and a thread wheel catching hook while controlling them synchronously with independent drive motors. The present invention relates to an apparatus for displaying and outputting diagnostic information for diagnosing synchronization control to be synchronized.

[0002]

2. Description of the Related Art Conventionally, a sewing machine main body of a normal sewing machine mainly includes a bed portion, a pillar portion, an arm portion and a head portion, and a main shaft driven by a sewing machine motor is provided in the arm portion. The needle bar, sewing needle and balance of the section are driven up and down by the driving force of the main shaft. In the bed portion, there is provided a thread wheel catching shuttle which is driven by the lower shaft and forms a thread loop of the upper thread in cooperation with the sewing needle, and the lower shaft is also rotationally driven by the driving force from the main shaft. Since the sewing needle and the shuttle for catching the thread wheel need to be operated synchronously, the lower shaft is driven by the main shaft in the conventional sewing machine.

By driving the thread wheel catching hook independently of the main shaft by a dedicated hook driving motor, the thread wheel catching hook is driven synchronously with the spindle while the thread wheel catching hook is driven in accordance with sewing conditions. Can be precisely controlled every moment. Various types of spindle-separator-separation-drive sewing machines of this type have been proposed. For example, JP-A-60-
In Japanese Patent No. 21750, a needle drive motor for driving a sewing needle and a hook drive motor for driving a thread wheel catching hook are provided, and the needle drive motor and the hook drive motor are driven so that the sewing needle and the thread wheel catching hook operate synchronously. There has been proposed a sewing machine that controls a motor in synchronization with a series of stitches to perform perfect stitching.

Japanese Utility Model Laid-Open Publication No. Sho 61-158816 discloses a sewing machine in which a needle drive motor and a shuttle drive motor are provided and controlled synchronously to prevent skipping and to improve the tightness of a stitch. Proposed. JP-A-3-2342
No. 91 and JP-A-3-234293 disclose that a sewing needle is driven by a sewing machine motor via a main shaft, and a thread wheel catching hook is driven independently by a hook driving motor different from the sewing machine motor to reduce the rotation amount of the main shaft. A rotary encoder for detection is provided, and interlocking control means for turning the hook drive motor by the amount of rotation of the main shaft by manual operation is provided so that the interlocking relationship between the sewing needle and the hook for catching the thread wheel is not shifted. Sewing machines have been proposed.

[0005] In the above-mentioned spindle hook separate drive sewing machine, the origin position of the spindle, the rotation angle of the sewing machine motor, the origin position of the shuttle, the rotation angle of the hook drive motor, and the like are detected. Synchronous control is performed so that the drive motor rotates in synchronization with the drive motor. If the synchronization control is out of order, the sewing needle and the shuttle will interfere with each other and damage the sewing needle and the shuttle, or the quality of the sewn product will be degraded. If the conditions fluctuate, the load on the sewing machine motor and the shuttle drive motor will change, and the synchronous control will be out of order.

[0006]

In the conventional spindle hook separating drive type sewing machine, the origin position of the sewing needle and the hook, the sewing machine motor and the sewing machine motor are adjusted so that the sewing needle and the hook meet at a predetermined meeting phase angle when the sewing machine is assembled. Although the rotation speed of the shuttle drive motor is adjusted, the adjustment requires skill and requires a great deal of labor. When repairing the sewing machine, the same adjustment as described above is required. Conventionally, there is no means for obtaining diagnostic information suitable for diagnosing a phase angle shift between the sewing needle and the shuttle (synchronous control shift), and the phase angle shift is diagnosed and adjusted based on the experience of a skilled person. Therefore, the above-mentioned adjustment work is troublesome. SUMMARY OF THE INVENTION It is an object of the present invention to create and store diagnostic information for diagnosing synchronous control in a spindle hook separate drive sewing machine, to enable the diagnostic information to be displayed and output, and to provide various diagnostic information. It is possible to make it possible to make it possible to make statistically processed information of diagnostic information.

[0007]

According to a first aspect of the present invention, there is provided a spindle-separator-separation drive type sewing machine, wherein a head portion provided with a needle bar and a sewing needle driven via a spindle by a sewing machine motor, and an upper thread cooperating with the sewing needle. A bed equipped with a yarn catching kettle for catching
A spindle hook separation drive type sewing machine including a hook drive motor that drives the yarn catching hook independently of the spindle; first detection means for detecting an origin position of the spindle and a rotation angle of the sewing machine motor; A second detecting means for detecting an origin position of the yarn catching hook and a rotation angle of the shuttle driving motor; and a detecting wheel from the first and second detecting means, the thread catching hook being attached to the main shaft. Synchronous control means for controlling at least one of the sewing machine motor and the shuttle drive motor to rotate in synchronization,
Diagnostic information generating means for receiving diagnostic signals from the first and second detecting means and generating diagnostic information for diagnosing synchronization control by the synchronous control means; and diagnostic information generated by the diagnostic information generating means And information storage means for storing the information.

The first detecting means may be configured to detect the origin position of the main shaft and the rotation angle of the sewing machine motor by one detecting means, or may be configured to detect by two detecting means. The second detecting means may be configured to detect the origin position of the thread wheel catching hook and the rotation angle of the hook driving motor with one detecting means,
The structure which detects with two detection means may be sufficient. The origin position of the main spindle is, for example, a position at a rotation angle (phase angle) of 0 ° which is a needle position, and the origin position of the thread wheel catching hook is, for example, a rotation angle (phase angle) of 0 ° corresponding to the needle position. Position.

The synchronous control means controls at least one of the sewing machine motor and the shuttle driving motor so that the thread wheel catching shuttle rotates in synchronization with the main shaft. In the case where the yarn catching hook is synchronized with the main shaft, when the main shaft is at the home position, the yarn catching hook also becomes the home position, and a predetermined meeting angle (for example, a phase angle)
At the time of 204.5 °), the blade point of the thread catching hook encounters the sewing needle, and the thread catching hook cooperates with the sewing needle to form a thread loop of the upper thread, and sewing is performed by the upper thread and the lower thread. That is, when the phase angle of the main shaft is the meeting angle and the phase angle of the yarn wheel catching hook is equal to the meeting angle, the main shaft and the yarn wheel catching hook are synchronized.

The diagnostic information creating means creates diagnostic information for diagnosing the synchronization control by the synchronous control means, and the information storage means stores the diagnostic information. Synchronous control can be diagnosed based on the amount of deviation of the phase angle of the thread catching hook from the phase angle of the main shaft when the main shaft phase angle is at or near the meeting angle. The deviation amount may be obtained for each stitch, or may be obtained for each predetermined number of stitches (for example, tenth stitch) of each stitch pattern when a predetermined stitch pattern is repeatedly sewn. Further, in the case where a predetermined stitch pattern is repeatedly sewn, the synchronous control can be diagnosed based on a deviation amount of a phase angle of the thread wheel catching hook with respect to a phase angle of the main shaft when the sewing machine stops.

According to a second aspect of the present invention, there is provided a spindle hook separation drive type sewing machine according to the first aspect, further comprising: display means including a display; and display control means for displaying diagnostic information stored in the information storage means on a display of the display means. It is characterized by having. As described above, since the diagnostic information can be displayed on the display of the display means, based on the displayed diagnostic information, the origin position of the main spindle and the origin position of the thread wheel catching hook can be adjusted, and the sewing machine motor and shuttle hook can be adjusted. For example, the control characteristics of the drive motor can be adjusted. In addition, the same operation as the first aspect is achieved.

According to a third aspect of the present invention, in the second aspect of the invention, the display control means displays the diagnostic information on a display of a display means in a table format. is there. As described above, since the diagnostic information is displayed on the display in the form of a table, the diagnostic information is easily viewed. In addition, the same operation as the second aspect is achieved.

According to a fourth aspect of the present invention, in the sewing machine according to the first or second aspect, the diagnostic information creating means is configured to operate in a designated one of a plurality of modes for creating different types of diagnostic information. It is characterized in that it is configured to operate. A plurality of modes in a case where a predetermined stitch pattern is repeatedly sewn include, for example, a phase angle of the thread catching hook with respect to a phase angle of the main shaft when the phase angle of the main shaft for each needle is at or near the meeting angle. In this mode, the phase angle of the main shaft when the number of stitches is a predetermined number of stitches for each stitch pattern or the phase angle of the main shaft when the position of the main shaft is in the vicinity thereof is the deviation amount of the phase angle of the thread catching hook. Modes for determining the amount of deviation of the phase angle of the thread catching hook with respect to the phase angle of the main shaft when the phase angle of the main shaft at the end of sewing of each stitch pattern is at or near the encounter angle. Is desirably provided. By creating the diagnostic information by switching the modes, it is possible to create different types of diagnostic information. In addition, the same operation as the first or second aspect is achieved.

According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the diagnostic information creating means is capable of creating information obtained by statistically processing the diagnostic information. It is. The information obtained by statistically processing the diagnostic information is, for example, information such as an average value, a maximum value, and a minimum value of the deviation amount.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. Referring to FIG. 1, a description will be given of a spindle hook separation drive type sewing machine 1. The sewing machine main body has a bed portion 2, a pillar 3, and an arm portion 4. A needle bar 5 is provided on the needle bar holder so as to be movable up and down.
Is mounted and the upper shaft 8 (spindle) disposed in the arm portion 4
Is connected to the needle bar 5 via a needle bar crank 7, and the upper shaft 8 is rotatably supported by a bearing 9. Although not shown, a balance is also connected to the upper shaft 8 via a balance crank. A sewing machine motor 10 is provided outside the sewing machine body.
Is fixedly provided to the sewing machine main body, and the output shaft of the sewing machine motor 10 is connected to the upper shaft 8 via a coupling 10b, and the upper shaft 8 is driven to rotate by the sewing machine motor 10. The sewing machine motor 10 is a servomotor provided with a rotary encoder 10a, and is driven and controlled by a control unit 20 described later.

At a position corresponding to the sewing needle 6 in the bed 2, there is provided a thread wheel catching hook 11, which is, for example, a half-turn shuttle, and a lower shaft 12 for driving the thread wheel catching hook 11 is provided on the bed section 2. The lower shaft 12 is rotatably supported by a bearing 13, and a shuttle drive motor 14 is provided outside the sewing machine main body or in the bed portion 2, and an output shaft of the shuttle drive motor 14 is connected via a coupling 14 b. The lower shaft 12 is rotatably driven by a shuttle drive motor 14. The shuttle drive motor 14 is a servomotor provided with a rotary encoder 14a, and is driven and controlled by a control unit 20 described later.

In order to detect the position of the origin of the upper shaft 8, a substantially semicircular detection disk 17a is fixed to the upper shaft 8, and the upper shaft 8 is formed of a photo-interrupter positioned across the rotation locus of the detection disk 17a. An axis origin sensor 17 is provided. When the origin position of the upper shaft 8 is at the origin position of the upper shaft 8 (in this embodiment, the position of the needle 8 at a rotation angle of 0 °), the upper axis origin sensor 17 is turned on. , Then until just before the needle down position
N is maintained, and when the needle comes to the needle down position, it is turned off, and thereafter, it is kept off until just before the needle up position. Upper axis origin sensor 17
Is supplied to the control unit 20.

In order to detect the origin position of the lower shaft 12, a detection disk 18a having one slit on the circumference is fixed to the lower shaft 12, and the detection disk 18a is located across the rotation locus of the detection disk 18a. A lower axis origin sensor 18 composed of a photo interrupter is provided, and the origin position of the lower axis 12 (in the case of the present embodiment, the rotational position of the upper axis 8 and the lower axis 12 is set correctly). The lower axis origin sensor 18 is turned on when the lower shaft 12 has a rotation angle of 0 ° corresponding to the origin position, and turned off at other positions.
Becomes The detection signal of the lower axis origin sensor 18 is supplied to the control unit 20.

Next, a control system of the sewing machine 1 will be described. As shown in FIG. 2, the control unit 20 includes a CPU
21, a ROM 22, a RAM 23, an input / output interface 24, a counter 26 for counting detection signals from the rotary encoder 10a, a drive circuit 27 for driving the sewing machine motor 10, a drive circuit 28 for driving the shuttle drive motor 14, and a rotary encoder 14a. A counter 29 for counting detection signals, drive circuits 31 and 32, a display controller 25 (D / C), and the like are provided. The counter 26 detects that the detection signal of the upper axis origin sensor 17 is OF.
The counter 29 is reset to 0 when it is turned on from F, and the counter 29 is reset to 0 when the detection signal of the lower axis origin sensor 18 is turned on. It is desirable that the rotary encoders 10a and 14a have a resolution of at least about 0.1 ° in the angle of the upper shaft 8 and the lower shaft 12.

The start switch 15 of the sewing machine 1 is connected to the input / output interface 24, and the operation panel 1 of the sewing machine 1
The liquid crystal display 16a is driven and controlled by a display controller 25, and signals from various switches on the operation panel 16 are also supplied to the input / output interface 24. The R-axis drive motor 30 and the θ-axis drive motor 32
Is a motor that independently feeds the work cloth to be sewn in the R direction and the θ direction in the R-θ coordinate system.

The ROM 22 includes sewing control (which includes synchronous control), diagnostic data collection and storage control, diagnostic data analysis control, diagnostic data display control, and sewing machine motor 1 described later.
0 and the rotation speed of the shuttle drive motor 14
A control program, such as motor drive control for performing feedback control using the count value of, to achieve the set rotational speed, is stored in advance. The diagnostic data includes the sewing machine motor 10 so that the upper shaft 8 and the lower shaft 14 rotate in synchronization.
And data for diagnosing synchronous control for controlling at least one of the shuttle drive motor 14. In the RAM 23,
A ring buffer 23a for storing diagnostic data and work memories necessary for executing the various controls are provided. As shown in FIG.
3a stores diagnostic data at the address pointed to by the log pointer LP.

When selecting a collection, storage, display, and analysis of diagnostic data, a predetermined command is input from the operation panel 16, a menu screen as shown in FIG. 4 is displayed on the display 16a, and the cursor 16c and the cursor movement are performed. Each item of A, B, C can be selected via the key and the execution key. If you select diagnostic data collection and storage,
A screen A shown in FIG. 5 is displayed, and a desired mode among modes 1, 2, and 3 can be selected on the screen A via the cursor 16c, the cursor movement key, and the execution key. However, when mode 2 is selected, it is necessary to set the number of stitches n. When any one of the modes 1, 2, and 3 is set, the mode flag LM is set to any of 1, 2, and 3 according to the setting.

Mode 1 is a mode for collecting and storing diagnostic data for each needle in a sewing operation as described later, and mode 2 is a mode for repeatedly stopping after sewing a predetermined stitch pattern as described later. When a plurality of predetermined stitch patterns are sewn, the mode is a mode for collecting and storing diagnostic data for the set number of stitches n for each stitch pattern. Mode 3 is executed every minute time as described later. In this mode, diagnostic data is collected and stored for each synchronous control.

Next, sewing control and diagnostic data collection / storage control will be described with reference to the flowcharts of FIGS. In the flowchart, reference symbol Si (i = 1, 2, 3)
...) show each step. As shown in FIG. 6, when the power supply to the sewing machine 1 is turned on, the control is started. The control waits until the start switch 15 is turned on while determining whether or not the start switch 15 is turned on. When the start switch 15 is turned on (S1: Yes),
The stitch number counter CN that counts the number of stitches when sewing each stitch pattern is cleared (S2), and the log pointer LP indicating the data storage position of the ring buffer 23a that stores the diagnostic data is cleared (S3). Next, the sewing machine motor 10 and the shuttle drive motor 14 are started, and these motors 10 and 14 are driven and controlled by the motor drive control so as to reach the set speed Ss set in advance from the operation panel 16 (S4). A subroutine for synchronous control is executed (S5).

Next, it is determined whether or not the start switch 15 is OFF (S6). While the start switch 15 is ON, S5 and S6 are performed.
Are repeated to execute sewing and diagnostic data collection and storage. If the start switch 15 is turned off (S6: Yes) when the sewing machine 1 is to be stopped, for example, when the sewing of each stitch pattern is completed (S6: Yes). The motor 10 and the shuttle drive motor 14 are stopped (S7), and thereafter, the process returns to S1, and S1 and subsequent steps are repeated. This control ends when the power is turned off.

The synchronous control subroutine in S5 will be described with reference to FIG. First, the upper axis counter 26
Is read (S10), the rotation angle Up of the upper shaft 8 is calculated based on the count value, and the RAM 2
3 (S11). For example, when the current position of the upper shaft 8 is the needle-up position, the rotation angle Up is 0 °, and when the current position of the upper shaft 8 is the needle-down position, the rotation angle U is 0 °.
p = 180 °. Next, the count value of the lower shaft counter 29 is read (S12), and the rotation angle Dp of the lower shaft 12 is calculated based on the count value, and stored in the memory of the RAM 23 (S13).

Next, the lower shaft 12 with respect to the rotation angle Up of the upper shaft 8
Is the relative shift amount Z of the rotation angle Dp of Z = (Up−Dp)
And is stored in the memory of the RAM 23 (S
14). Next, it is determined whether or not the displacement amount Z is Z ≧ 0 (S1).
5) If the determination is Yes, the upper shaft 8 is ahead of the lower shaft 12, and the rotation speed of the sewing machine motor 10 is k × Z.
(Where k is a predetermined constant). in this case,
A signal or data for instructing the motor drive control to decelerate is output. In the case of Z = 0, since k × Z = 0, the deceleration is not substantially executed. S
If the determination of No. 15 is No, since the upper shaft 8 is behind the lower shaft 12, the rotation speed of the sewing machine motor 10 is increased by k × Z (S17). Also in this case, a signal or data for instructing the motor drive control to increase the speed is output. In this way, the rotation angle (phase angle) of the upper shaft 8 and the rotation angle (phase angle) of the lower shaft 12 are matched, that is, the upper shaft 8 and the lower shaft 1
Synchronous control for synchronously rotating the second and the second is performed.

Subsequent to S16 or S17, a subroutine for diagnostic data collection / storage processing is executed (S18). Next, whether or not the detection signal of the upper axis origin sensor 17 has been switched from OFF to ON (that is, the needle upper position) No) (S1)
9) If the determination is Yes, the stitch number counter CN is incremented by 1 (S20) and the process returns to S6.
When the determination in S19 is No, the process returns to S6 without incrementing the stitch number counter CN.

The subroutine of the diagnostic data collection / storage processing in S18 will be described with reference to FIG. At first,
It is determined whether or not the mode flag LM = 1 (S30).
In the case of 1, since it is necessary to collect diagnostic data for each needle, in S31, the rotation angle Up of the upper shaft 8 is determined by the angle of encounter (the position where the sewing needle and the point of the hook of the hook for catching the thread wheel meet). It is determined whether or not it is near. In the sewing machine 1 according to the present embodiment, since the meeting angle is 204.5 °, if Up ≒ 204.5 °, S
The determination at 31 becomes Yes, and the routine goes to S35. Also, S
When the determination of No. 31 is No, the process returns to S19.

In S35, the diagnostic data is read from the counter or the memory, and the diagnostic data (the data of the number of stitches CN, the data of the upper axis rotation angle Up, the data of the lower axis rotation angle) is stored in the address of the ring buffer 23a indicated by the log pointer LP. Dp data, deviation amount Z data, etc.) are stored, and then the log pointer LP is updated so as to point to the next data write position (S36), and thereafter, the process returns to S19. on the other hand,
When the mode flag LM is not 1 (S30: No) and the mode flag LM = 2 (S32: Yes), it is necessary to collect diagnostic data when the number of stitches is set for each stitch pattern. It is determined whether or not the number of stitches is a set value, that is, whether or not CN = n (set value) (S33). If the determination is Yes, S35 and S36 are executed, and the process returns to S19. S33
If the determination is No, S35 and S36 are skipped and the process returns to S19.

Further, if the mode flag LM is not 2 (S
32: No), when the mode flag LM = 3 (S34:
In the case of Yes), since it is necessary to collect diagnostic data for each synchronous control, the process returns to S19 after executing S35 and S36. If the determination in S34 is No, the process returns to S19.

As described above, when "diagnosis data display" is selected on the menu screen shown in FIG. 4 in a state where the diagnostic data is collected and stored in the ring buffer 23a and the sewing machine 1 is stopped, the diagnostic data is displayed. 16a is displayed in a table format. FIG. 10 is a display example of diagnostic data collected and stored in mode 1, FIG. 11 is a display example of diagnostic data collected and stored in mode 2, and FIG. 12 is a display example of diagnostic data collected and stored in mode 3. 10 to 12, the diagnostic data can be scrolled one after another by moving the cursor 16c downward.
If the total number of stitches of each stitch pattern in the present embodiment is 50 and the sewing machine 1 is stopped in a state where the number of stitches is sewn to the number of stitches CN = 50, in the case of mode 3, diagnostic data is collected every moment. Therefore, the diagnostic data immediately before the end of the sewing remains in the ring buffer 23a. Also,
As described above, the display control itself for displaying the diagnostic data is as follows.
The description is omitted because it is the same as the well-known technique.

On the other hand, in the state where the diagnostic data is collected and stored in the ring buffer 23a as described above and the sewing machine 1 is stopped, when "diagnosis data analysis" is selected on the menu screen shown in FIG. Is performed. In this diagnostic data analysis processing, first, the data of the deviation amount Z of the diagnostic data is read from the ring buffer 23a (S40), and the average deviation amount, the maximum deviation amount, the minimum deviation amount, The standard deviation is calculated (S41), stored in the memory of the RAM 23 (S42), and the process ends. After the execution of the above-described analysis processing, the data of the analysis result can be displayed on the display 16a as shown in FIG.

According to the above-described spindle-separator-separation-drive type sewing machine 1, since the upper shaft 8 and the lower shaft 12 are synchronously controlled so as to rotate synchronously, sewing of desired quality can be reliably performed. Various diagnostic data can be collected and stored in desired modes 1, 2, and 3, and the collected diagnostic data can be displayed in a table format on the display 16a. Since the quality of synchronization control, the degree of synchronization failure, and the like can be diagnosed, adjustment work for synchronization at the time of assembling and repairing the sewing machine can be simplified and efficiently performed. Moreover, since the diagnostic data can be displayed on the display 16a in a table format,
Diagnostic data is easier to see. In addition, since the diagnostic data can be statistically processed to create the data, it is easy to determine the quality of the synchronization control, the degree of the synchronization failure, and the like.

Next, a description will be given of a modification in which the above-described embodiment is partially changed and a modification which is added to the above-described embodiment. 1) In S31 of FIG. 8, by determining whether the absolute value of (Up−204.5 °) is equal to or less than a predetermined value α (for example, α = 20 °), a predetermined range before and after the encounter angle is included. Can be collected and stored. 2) The diagnostic data is collected and stored in the mode 3 at an angle of the upper axis 8 at every predetermined angle β (for example, β = 5 to 10 °), and extends from 0 to 360 ° of the upper axis 8. The diagnostic data (for one cycle) may be stored in the ring buffer. The diagnostic data may be displayed in a graph format as shown in FIG. 14 in addition to the table format, or may be recorded and output.

3) A floppy disk drive capable of driving a floppy disk for a personal computer is provided in the control unit 20, and the diagnostic data stored in the ring buffer 23a is written to the floppy disk via the floppy disk drive. The floppy disk may be mounted on a personal computer and recorded on a printer via the personal computer. Alternatively, a printer may be connected to the control unit 20 so that the diagnostic data stored in the ring buffer 23a is recorded on the printer.

4) While the sewing machine 1 is stopped, the upper shaft 8 and the lower shaft 1
6 may be in a state of remarkable synchronization deviation by manually turning the sewing machine motor 1 immediately after the start of the control in FIG.
It is preferable that the upper shaft 8 be initialized to the needle upper position (rotation angle 0 °) by operating 0, and the lower shaft 12 be initialized to the rotation angle 0 ° by operating the shuttle drive motor 14.

[0038]

According to the first aspect of the present invention, synchronous control is performed by receiving detection information of the origin position of the main shaft, the rotation angle of the sewing machine motor, the origin position of the thread wheel catching hook, and the rotation angle of the hook driving motor. The diagnostic information creating means for creating the diagnostic information for diagnosing the synchronization control by the means and the information storing means for storing the diagnostic information created by the diagnostic information creating means are provided. Diagnostic information can be displayed and output or recorded and output. The quality of the synchronous control, the degree of deviation of the synchronous control, and the like can be easily diagnosed by looking at the diagnostic information. Therefore, when assembling or repairing the sewing machine, the adjustment work for synchronizing the main shaft and the thread wheel catching hook is simplified.

According to the second aspect of the present invention, since the diagnostic information can be displayed on the display of the display means, the origin position of the main spindle and the origin position of the thread catching hook are adjusted while viewing the displayed diagnostic information. And the control characteristics of the sewing machine motor and the shuttle drive motor can be adjusted. The other effects are the same as those of the first aspect.

According to the third aspect of the present invention, since the diagnostic information is displayed on the display in the form of a table, the diagnostic information can be easily viewed. The other effects are the same as those of the second aspect.

According to the fourth aspect of the present invention, since the diagnostic information creating means is configured to operate in a designated mode among a plurality of modes for creating different types of diagnostic information, the mode is switched. By creating diagnostic information,
Different types of diagnostic information can be created. In addition, the same effect as the first or second aspect is obtained.

According to the fifth aspect of the present invention, since the diagnostic information creating means can create information obtained by statistically processing the diagnostic information, for example, an average value, a maximum value, and a minimum value of the deviation amount can be obtained. Based on such information, it becomes easy to diagnose the synchronization control. The other effects are the same as those of the fourth aspect.

[Brief description of the drawings]

FIG. 1 is a schematic front view of a spindle hook separation drive type sewing machine according to an embodiment of the present invention.

FIG. 2 is a block diagram of a control system of the sewing machine.

FIG. 3 is an explanatory diagram of a data structure of diagnostic data stored in a ring buffer.

FIG. 4 is a diagram showing a display example of a menu screen.

FIG. 5 is a diagram showing a display example of a screen A.

FIG. 6 is a flowchart of sewing control including synchronous control and diagnostic data collection and storage control.

FIG. 7 is a flowchart of a subroutine of synchronization control of FIG. 6;

FIG. 8 is a flowchart of a subroutine of a diagnostic data collection / storage process of FIG. 7;

FIG. 9 is a flowchart of a diagnostic data analysis process.

FIG. 10 is a diagram showing a display example of a screen B in a mode 1;

FIG. 11 is a diagram illustrating a display example of a screen B in a mode 2;

FIG. 12 is a diagram illustrating a display example of a screen B in a mode 3;

13 is a diagram showing a display example of a screen C. FIG.

FIG. 14 is a diagram illustrating a display example of a shift amount for one cycle.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 Spindle hook separation drive type sewing machine 8 Upper shaft 10 Sewing motor 10a Rotary encoder 11 Thread wheel catching hook 12 Lower shaft 14 Hook drive motor 14a Rotary encoder 16 Operation panel 16a Display 17 Upper axis origin sensor 18 Lower axis origin sensor 20 Control unit

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takehisa Nozaki 15-1, Naeshiro-cho, Mizuho-ku, Nagoya-shi Inside Brother Industries, Ltd. (72) Inventor Koichi Harada 15-1 Naeshiro-cho, Mizuho-ku, Nagoya In company

Claims (5)

[Claims] A head provided with a needle bar and a sewing needle driven by a sewing machine motor via a main shaft; and a bed provided with a thread catching hook for catching a thread thread of an upper thread in cooperation with the sewing needle. ,
A spindle hook separation drive type sewing machine including a hook drive motor that drives the yarn catching hook independently of a spindle; a first detection unit that detects an origin position of the spindle and a rotation angle of the sewing machine motor; Second detecting means for detecting an origin position of the yarn catching hook and a rotation angle of the shuttle driving motor; and using the detection signals from the first and second detecting means, the thread catching hook becomes the main shaft. Synchronous control means for controlling at least one of the sewing machine motor and the shuttle drive motor so as to rotate synchronously; receiving a detection signal from the first and second detection means, and diagnosing synchronization control by the synchronous control means. A spindle hook separation drive sewing machine, comprising: diagnostic information creating means for creating diagnostic information for use; and information storage means for storing the diagnostic information created by the diagnostic information creating means. 2. The spindle hook separater according to claim 1, further comprising display means including a display, and display control means for displaying diagnostic information stored in the information storage means on a display of the display means. Driven sewing machine. 3. The sewing machine according to claim 2, wherein the display control means displays the diagnostic information on a display of a display means in a table format. 4. The apparatus according to claim 1, wherein the diagnostic information creating unit is configured to operate in a designated mode among a plurality of modes for creating different types of diagnostic information. Spindle hook separation drive type sewing machine. 5. The spindle hook separate drive sewing machine according to claim 4, wherein the diagnostic information creating means is capable of creating information obtained by statistically processing the diagnostic information.