JP2003126577A - Sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To confirm the timing for the motions of both of a sewing machine needle and a shuttle prior to sewing, after adjusting the meeting location between the sewing machine needle and the shuttle, form favorable stitches, and reduce the number of working processes. SOLUTION: This sewing machine 1 is equipped with the sewing machine needle 3, the shuttle 4 which catches a needled thread at the distal end of the sewing machine needle, a main spindle servo motor 50 which drives the sewing machine needle 3, and a shuttle shaft servo motor 51 which drives the shuttle 4. In this case, the main spindle servo motor 50 and the shuttle shaft servo motor 51 are independently and synchronously driven for this sewing machine 1. Such a sewing machine 1 is equipped with a location-adjusting means, a confirmation key 37 which instructs a confirming motion, and a CPU11. In this case, the location-adjusting means comprises an adjusting shaft-selecting key 34, a fine adjustment increase key 36a, and a fine adjustment decrease key 36b. The adjusting shaft-selecting key 34 adjusts the positional relationship between the sewing machine needle 3 and the shuttle 4 in advance so that the sewing machine needle 3 and the tip 4a of the shuttle 4 may approach by the timing by which the needle thread can be caught. The CPU11 drives the sewing machine needle 3 and the shuttle 4 from the state adjusted by the location-adjusting means when receiving the instruction from the confirmation key 37.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing machine in which a sewing machine needle and a catching member for catching a needle thread connected to the sewing machine needle are independently driven and controlled.

[0002]

2. Description of the Related Art In a conventional sewing machine, a sewing machine needle is driven up and down by a main shaft that is driven by a main motor to rotate up and down, and the rotation of the main shaft is mechanically transmitted to a lower shaft so that a needle thread that is continuous with the sewing machine needle is used. By rotating and driving a member such as a shuttle for capturing (hereinafter, a capturing member), the needle and the capturing member are synchronized with each other. However, in recent years, sewing machines have been developed in which the main shaft and the lower shaft are driven by different drive sources. In such a sewing machine, it is necessary to adjust the position of the catching member with respect to the sewing machine needle before sewing so that the catching member can surely catch the needle thread on the side of the sewing machine needle.
For example, in the sewing machine disclosed in JP-A-9-140972,
The position where the sewing machine needle and the blade point of the hook meet was adjusted as follows. First, when the "encounter adjustment switch" is operated and then the "operation dial" is operated, at least one of the spindle and shuttle shaft is driven according to the change amount and resolution (sensitivity) of the operation dial, and the encounter position is set. adjust. The resolution at this time is "fine" and "coarse" depending on the operation sensitivity switch.
It was configured to be switchable to two stages.

[0003]

However, in the sewing machine of the above publication, although the adjusted state can be visually confirmed, it is determined whether the position of the sewing needle and the tip of the hook of the hook match in a state close to the sewing operation. I couldn't confirm. Therefore, when sewing is actually performed, there arises a problem that the position is misaligned, a defect such as a skipped stitch occurs, or the number of work steps is increased by re-adjusting.

An object of the present invention is to provide a sewing machine in which a sewing machine needle and a catching member such as a hook are independently controlled and driven, and after adjusting the encounter position between the sewing machine needle and the catching member, the timing of the operation of the sewing machine and the catching member is adjusted before sewing. It is possible to check and, as a result, to form a good seam, and in addition, to reduce the number of working steps.

[0005]

In order to solve the above-mentioned problems, the invention described in claim 1 can move up and down by passing a needle thread (T) as shown in, for example, FIGS. A sewing machine needle (3), a catching member (hook 4) that approaches the sewing machine needle and catches the needle thread at its tip, needle driving means (main shaft servomotor 50) that drives the sewing machine needle, and drives the catching member. In a sewing machine (1) provided with a catching member driving means (hook shaft servo motor 51) and the needle driving means and the catching member driving means are driven independently and synchronously, the needle and the sewing machine are caught at a timing capable of catching the upper thread. Position adjustment means (adjustment axis selection key 34, fine adjustment + key 36a, fine adjustment − key 36) that adjusts the positional relationship between the sewing needle and the capturing member in advance so that the members approach each other.
b) and to confirm the timing when both approaches,
A confirmation instruction type step (confirmation key 37) for instructing a confirmation operation,
It is characterized by comprising a confirmation driving means (CPU 11) for driving the sewing machine needle and the capturing member from the state adjusted by the position adjusting means in response to the instruction from the confirmation instructing means.

According to the first aspect of the present invention, the position adjusting means allows the catching member to approach the sewing machine needle in advance with respect to the positional relationship between the sewing machine needle and the catching member at a timing at which the upper thread can be caught. If there is an instruction from the confirmation instruction means after the adjustment, the sewing machine needle and the capturing member are driven from the state adjusted by the position adjustment means by the confirmation drive means, and the timing at which they approach each other can be confirmed. Therefore, it is possible to check the operation timings of the sewing machine needle and the catching member before the sewing after adjusting the position where they meet, and it is possible to form a good stitch without causing skipping in the actual sewing. Since it is not necessary to redo the adjustment after a failure after sewing, the number of working steps can be reduced as compared with the conventional method.

In the first aspect, the position adjusting means may adjust one of the sewing machine needle and the catching member with respect to the other, or may individually adjust the other as in the second aspect. That is, the invention according to claim 2 is
The sewing machine according to claim 1 is characterized in that the position adjusting means is capable of adjusting the position by selecting each of the sewing machine needle and the capturing member as an adjustment target.

According to a third aspect of the invention, in the sewing machine according to the first or second aspect, the confirmation driving means drives the sewing needle and the capturing member an integral number of times. According to the third aspect of the present invention, the sewing machine needle and the catching member are driven by the confirmation driving means an integral number of times. Therefore, first, when the sewing machine needle and the catching member catch the thread during the adjustment by the position adjusting means. If the position is adjusted to the same state as in the above, when it is driven by the confirmation driving means thereafter, the sewing machine needle and the capturing member are driven an integral number of times, almost returned to their original positions, and the positional relationship between them has been stopped. You can easily check with.

The invention according to claim 4 is the sewing machine according to any one of claims 1 to 3, further comprising speed setting means (rotation number setting screen 41) for setting a driving speed at the time of confirmation driving. And According to the invention described in claim 4, since the speed at the time of confirmation driving can be set by the speed setting means, for example, if the speed is set to a small speed, the positional relationship between the sewing machine needle and the capturing member can be sufficiently confirmed even during operation. If the speed is set to a high value, the state at the time of sewing can be confirmed. In this way, it is possible to freely confirm according to the purpose.

According to a fifth aspect of the present invention, in the sewing machine according to any one of the first to fourth aspects, drive amount setting means (rotation number setting screen 41) for setting a drive amount during confirmation drive is provided. And According to the invention of claim 5, since the drive amount at the time of confirmation drive can be set by the drive amount setting means, for example, when the confirmation work is desired to be completed in a short time, the drive amount is set small and a little time is spent. If you want to make a precise check even after applying, you can set a large drive amount. In this way, it is possible to confirm according to the purpose and situation. here,
The drive amount may be, for example, the number of rotations (the number of rotations) or the confirmation driving time.

According to a sixth aspect of the present invention, in the sewing machine according to any one of the first to fifth aspects, the positional relationship between the sewing needle and the catching member that can reliably catch the upper thread is used as a reference. Deviation display section for displaying deviation (deviation display section 4
0) is provided. According to the invention of claim 6, the positional relationship between the sewing machine needle and the catching member is adjusted to a position where the upper thread can be reliably caught, but when actually driven, the sewing machine needle and the catching member are If there is a positional deviation between them, the positional deviation can be visually recognized, which is more convenient.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows a control block diagram of a sewing machine 1 as an example of the present invention. Note that FIG.
Then, only the configuration necessary for the present invention is shown, and other drive circuits, drive sources, various sensors, etc., which are not necessary for explanation, are omitted. As shown in FIG. 2, the sewing machine 1 is provided with a needle bar 2 to which a sewing machine needle 3 through which a needle thread T is fixed and a sewing machine bed (not shown) are provided, and a bobbin thread is wound. There is provided a shuttle 4 in which a bobbin case (not shown) accommodating the bobbin is set. The sewing machine 1 drives the needle bar 2 up and down by a main shaft servo motor (needle driving means) 50 and rotates the shuttle 4 by a shuttle shaft servo motor (capturing member driving means) 51 while entwining the upper and lower threads. Then, the sewing (main stitch) is formed on the material S to be sewn placed on the bed. In the sewing machine 1, the shuttle 4 and the sewing needle 3 are driven by independent motors, respectively,
As in the state shown in FIG. 2, the blade point 4 of the hook 4 which is the capturing member.
It is necessary to adjust in advance the timing at which the sword tip 4a and the sewing machine needle 3 meet so that a comes close to the tip of the sewing machine needle 3 and the upper thread can be reliably hooked. This hook capture timing adjustment processing will be described later.

As shown in FIG. 1, the sewing machine 1 comprises a microcomputer (hereinafter referred to as a microcomputer) 10, a control section 20 for transmitting and receiving various control signals, an operation panel 30 and the like.

The control unit 20 includes a sewing machine control circuit 21, an input control circuit 22, and an output control circuit 23. The sewing machine control circuit 21 outputs a control signal for controlling the drive of the spindle servomotor 50 and the shuttle shaft servomotor 51 during sewing. Further, the main shaft servo motor 50 and the hook shaft servo motor 51 respectively include a main shaft encoder 50a and a hook shaft encoder 5 for detecting a rotation speed (rotation speed) and a rotation angle.
1a is provided in close proximity. Encoders 50a, 5
The detection signal from 1a is input to the input control circuit 22.

The microcomputer 10 is a CPU (Central Process).
sing unit) 11 and ROM (Read Only Memory) 12
And a RAM (Random Access Memory) 13.
In the ROM 12, a control program of the sewing machine 1, control data, and various sewing data are written. The RAM 13 is provided with various work memories, counters and the like, is used as a work area during the sewing operation, and various data relating to the hook capture timing adjustment processing is also stored in the RAM 13.

The operation panel 30 is composed of, for example, a touch panel type liquid crystal display screen, and corresponds to the input control circuit 22 of the control section 20 when an operator inputs a predetermined instruction or set value through a switch or the like on the display screen. The signal to perform is input. Further, according to the output control signal from the output control circuit 23, predetermined contents are displayed on the display screen. FIG. 3A shows a shuttle catch timing adjustment screen 31 displayed on the operation panel 30. This screen 3
1 is displayed by selecting a shuttle catch timing adjustment mode by operating a predetermined switch (not shown) on the operation panel 30.

On the hook capture timing adjustment screen 31, a main spindle display section 32, a hook axis display section 33, an adjustment axis selection key 34, a rotation number setting key 35, a fine adjustment + key 36a, a fine adjustment-key 36b, and a confirmation key 37. A registration key 38, a cancel key 39, and a shift display section 40 are provided. The adjustment axis selection key 34 selects an axis to be adjusted from either the spindle or the shuttle shaft. The spindle and the shuttle shaft are alternately selected each time the operation is performed, and if the spindle is selected, the spindle is selected. The display unit 32 is highlighted, and when the shuttle shaft is selected, the shuttle shaft display unit 33 is highlighted.

Fine adjustment + key 36a and fine adjustment-key 36
b is the rotational position of the axis selected by the adjustment axis selection key 34,
Each time, each time the button is pressed, a predetermined unit is moved to the + side and the-side by a small angle. For example, when the main shaft is selected as the adjustment shaft and it is desired to advance the rotational position by a small amount with respect to the hook shaft, if the fine adjustment + key 36a is operated once, the main shaft is actually the + direction in the clockwise direction (the rotation direction at the time of sewing). Rotate to the side by a predetermined angle. Further, when the fine adjustment key 36b is operated once, the main shaft rotates in the negative direction in the counterclockwise direction (direction opposite to the rotation direction at the time of sewing) by a predetermined angle. These fine adjustments are performed while actually observing the positional relationship between the blade tip 4a of the shuttle 4 and the tip of the sewing machine needle 3. These adjustment axis selection keys 34,
The fine adjustment + key 36a and the fine adjustment-key 36b constitute the position adjusting means of the present invention. Incidentally, the displacement may be visually displayed on the spindle display unit 32 or the shuttle shaft display unit 33 in accordance with this fine adjustment.

When the rotation number setting key 35 is operated, as shown in FIG.
The rotation number setting screen 41 of (b) is displayed. The rotation number setting screen 41 is for setting the number of rotations (the number of rotations) and the rotation speed (the number of rotations) of rotating the main shaft and the hook shaft when the confirmation driving is performed not for the actual sewing but for the result of the timing adjustment. The speed setting means and the drive amount setting means of the present invention. The rotation number setting screen 41 is provided with a ten key 42, a right key 43a, a left key 43b, a backspace (BS) key 44, a return key 45, a rotation number display section 46, and a rotation speed display section 47. Rotation number display section 46,
On the rotation speed display portion 47, cursors 46a and 47a are displayed at positions where characters can be input, respectively. And
Operate the right key 43a, the left key 43b, the BS key 44,
While the cursors 46a and 47a are appropriately moved, the desired rotation number and rotation speed are input to the rotation number display section 46 and the rotation speed display section 47 with the ten keys 42, and finally the return key 45 is operated to adjust the hook capture timing. Screen 31
Return to. The number of rotations that can be input to the rotation number display unit 46 is an integral number.

When the confirmation key 37 which is the confirmation instruction means is operated, the main spindle and the hook shaft actually operate (confirmation drive) according to the number of rotations and the rotation speed set on the rotation number setting screen 41.
And then stop. The operator visually confirms whether or not the positions of the sword tip 4a of the shuttle 4 and the tip of the sewing machine needle 3 are aligned.
If it is determined that they match, the operator presses the registration key 38, thereby determining the positional relationship between the rotational positions of the main shaft and the shuttle shaft with the current settings. If they do not match, by operating the cancel key 39, all the settings up to that point can be canceled and the settings can be reset from the beginning.

The CPU 11 monitors signals from the main shaft encoder 50a and the shuttle shaft encoder 51a. Thus, in the shuttle catch timing adjustment mode, the drive deviation amount may be calculated by comparing the monitoring signals during the shuttle capture. When rotating a plurality of times, the average value of the deviation amount for each rotation is calculated. Then, after the confirmation driving is finished,
For example, "± 0.5 °" (here, it is + when there is a deviation in the direction in which the hook advances with respect to the needle, and -when it is in a direction in which it deviates) May be displayed, and a predetermined threshold value may be provided, and if the angle of the deviation amount is larger than the threshold value, it may be displayed blinking or changed in color so as to be conspicuous.

The CPU 10 uses the RAM 13 as a work area in accordance with the control program and control data of the ROM 12 and performs various processes based on various signals input to the input control circuit 22 while sewing the sewing machine 1 and capturing the hook. Controls the timing adjustment process, and the operation panel 30
The display is controlled and is also the confirmation driving means of the present invention.

Next, the shuttle catch timing adjusting process performed under the control of the CPU 10 will be described with reference to the flow charts of FIGS. First, in step S1, it is determined whether or not adjustment has been performed in the past. If the hook catch timing adjustment process has been performed before, the data remains, so in step S2, the main shaft and the hook shaft rotate according to the data, and the sewing machine needle 3 and the blade point 4a of the hook 4 meet. The state is entered, and the process proceeds to step S3. If it is determined in step S1 that the adjustment has not been performed, the process proceeds to step S3.

In step S3, the rotation number setting key 35
It is determined whether or not has been pressed. If it has not been pressed, the process proceeds to step S5, and if it has been pressed, the process proceeds to step S4, the rotation number setting screen 4 is displayed, and the rotation number / rotation speed setting process is performed. . FIG. 5 shows a subroutine of the number of rotations / rotational speed setting process. When this process starts, in step J1, a desired value is input to the rotation number display section 46 while operating the ten-key pad 42 and the like. Here, for example, about 1 to 10 times is input as the number of rotations. Then
When the return key 45 is operated in step J2,
Go to step J3. In step J3, the desired rotation speed is input to the rotation speed display portion 47, and then the return key 45 is operated in step J4, and this processing ends. The rotation speed input in step J3 is, for example, several hundreds to several thousands.

After the number of rotations / rotational speed setting process, FIG.
To step S5. In step S5, adjustment axis selection / adjustment processing for selecting an adjustment axis and adjusting the rotational position is performed. FIG. 6 shows a subroutine of adjustment axis selection / adjustment processing. When this process starts, in step J10,
It is determined whether or not the main axis is selected as the adjustment axis by operating the adjustment axis selection key 34. If the spindle is selected, the process proceeds to step J11, it is determined whether or not the fine adjustment + key 36a is pressed, and if it is pressed, at step J12 +
Rotate the spindle by a predetermined angle in the direction.

When it is determined in step J11 that the fine adjustment + key 36a is not operated, or step J12
After that, the process moves to step J13. In step J13, it is determined whether or not the fine adjustment key 36b has been pressed, and if it has been pressed, the process proceeds to step J14, in which the spindle is rotated by a predetermined angle in the-direction, and then this processing ends. If the fine adjustment-key 36b has not been pressed in step J13, this process ends. When this process ends, step S6 in FIG.
Move to. In step S6, it is determined whether the confirmation key 37 has been operated. If the shuttle shaft is not operated, the process returns to step S3. If it is desired to adjust the shuttle shaft at this stage, the adjustment shaft selection key 34 is operated again, and the shuttle shaft is selected in step J10.

In step J15, fine adjustment + key 36a
Is pressed, and if it is pressed, step J1
At 6, the shuttle shaft is rotated in the + direction by a predetermined angle. If it is determined in step J15 that the fine adjustment + key 36a is not operated, or after step J16, step J1
Move to 7. In Step J17, fine adjustment-key 36
It is determined whether or not b is pressed, and if it is pressed, step J1
After shifting to No. 8 and rotating the shuttle shaft in the predetermined angle-direction, this process is finished, and if not pushed, this process is finished as it is, and the process proceeds to step S6 of FIG. By finely adjusting the rotational positions of the main shaft and shuttle shaft in FIG. 6, the blade tip 4a of the shuttle 4
And the tip of the sewing machine needle 3 is adjusted to the same positional relationship as the captured state at the time of sewing.

After the adjustment axis selection / adjustment process of FIG. 6, if it is determined in step S6 of FIG. 4 that the confirmation key 37 is pressed, the process proceeds to step S7, where the work of adjusting the hook shaft and the spindle is performed in the past. It is determined whether or not has been performed. That is, it may be the one depending on the process of the immediately preceding step S5,
It may be based on the processing in the previous hook capture timing adjustment processing. In these cases, the processing shifts to the hook capture timing confirmation drive in step S8. If it is determined in step S7 that adjustment has not been performed in the past, step S12
Displays an error and returns to step S3. It should be noted that "not adjusted in the past" means that it has been determined in step S1 that no adjustment has been made in the past, and that the previous step S5
That is, no adjustment was made in (that is, the flow of FIG. 6). Even if the hook capture timing confirmation drive is performed in this state, it is meaningless to drive the hook and the sewing machine needle that have not been aligned at all.
It is configured to display an error.

In the hook capture timing confirmation drive of step S8, the main shaft and the shuttle shaft are actually driven to rotate at the rotation speed and the number of rotations set in step S3. When the rotation is stopped, it is visually checked whether or not the sword tip 4a of the shuttle 4 and the tip of the sewing machine needle 3 are at substantially the same positions as before rotation driving.
If the result of confirmation is that the position is displaced, the cancel key 39 is pressed (step S9). As a result, this process ends once, and when it is desired to readjust, the hook capture timing adjustment process is performed again from the beginning. When the position is not displaced and the sewing can be performed as it is, the registration key 38 is pressed (step S10). In response to this operation, step S1
In 1, the adjustment data regarding the position adjustment of the main shaft and the shuttle shaft is stored, and this processing is ended. If neither the cancel key 39 nor the registration key 38 is operated, step S3
The number of rotations / rotational speed setting process and the adjustment axis selection / adjustment process can be performed again. Therefore, at first, check drive at a slower rotation speed, for example 200 rpm, and then
It is also possible to perform confirmation driving a plurality of times such as confirmation driving at a rotation speed of sewing (for example, 4000 rpm).

According to the above-described sewing machine 1, before sewing, the adjustment axis is selected by the adjustment axis selection key 34, and then the upper thread is captured by the fine adjustment + key 36a and the fine adjustment-key 36b. If the sword tip 4a of the shuttle 4 is adjusted to approach the sewing machine needle 3 and the confirmation key 37 is operated, the sewing machine needle 3 and the shuttle 4 are driven from the state adjusted by the control of the CPU 11, and both are moved. You can check the approach timing. Therefore, it is possible to check the operation timings of the sewing machine needle 3 and the hook 4 before adjusting the sewing position after adjusting the position where they meet each other. In addition, it is possible to reduce the number of working steps as compared with the conventional method, since it is not necessary to redo the adjustment when the sewing fails.

Further, since the sewing machine needle 3 and the shuttle 4 are driven by the CPU 11 for an integral number of times, if the position of the sewing machine needle 3 and the shuttle 4 is adjusted in the same state as when the thread is caught, the adjustment can be confirmed after the adjustment. When it is driven, the sewing machine needle 3 and the shuttle 4 are driven an integral number of times, and almost return to their original positions, and it can be easily confirmed in a stopped state whether the two are in a preferable positional relationship.

In addition, since the rotation speed during the confirmation drive can be set on the rotation number setting screen 41, for example, if a small (slow) speed is set, the positional relationship between the sewing machine needle 3 and the shuttle 4 can be confirmed in a moving state. If the speed is set to a high value, the state at the time of sewing can be confirmed. In this way, it is possible to freely confirm according to the purpose. Further, since the number of rotations at the time of confirmation drive can be set on the number-of-rotations setting screen 41, for example, a small number of times is set when the confirmation work is desired to be completed in a short time, and a precise confirmation is required even if it takes time. A large number of times should be set. In this way, it is possible to confirm according to the purpose and situation. Further, by the shift display section 40,
Since the positional deviation between the sewing machine needle 3 and the shuttle 4 can be visually recognized, it is more convenient.

The present invention is not limited to the above-mentioned embodiment, and it goes without saying that it can be appropriately modified. For example, the specific structure of the operation panel, the number of rotations / rotation speed setting process,
The specific flow of the adjustment axis selection / adjustment process can also be changed as appropriate, and for example, in the flow of FIG. 6, it is possible to switch to the adjustment of another axis after the flow is once terminated. Adjustment may be made for both the main shaft and the shuttle shaft in one flow. Further, the displacement amount display on the hook capture timing adjustment screen 31 may be displayed in a graph display instead of a character display.

[0034]

According to the first aspect of the present invention, the position adjusting means allows the catching member to approach the sewing machine needle in advance with respect to the positional relationship between the sewing machine needle and the catching member at a timing at which the upper thread can be caught. As described above, if there is an instruction from the confirmation instruction means, the sewing machine needle and the capturing member can be driven from the state adjusted by the position adjustment means by the confirmation drive means, and the timing at which they approach each other can be confirmed. . Therefore, it is possible to check the operation timings of the sewing machine needle and the catching member before the sewing after adjusting the position where they meet, and it is possible to form a good stitch without causing skipping in the actual sewing. Since it is not necessary to redo the adjustment after a failure after sewing, the number of working steps can be reduced as compared with the conventional method.

According to the third aspect of the present invention, the sewing machine needle and the catching member are driven an integral number of times by the confirmation driving means. Therefore, when the position adjusting means makes an adjustment, the sewing machine needle and the catching member are threaded. If the position is adjusted to the same state as when capturing, then the sewing machine needle and the capturing member are driven an integral number of times when they are driven by the confirmation drive means, and they return to their original positions almost and the positional relationship between them is changed. It can be easily confirmed when stopped.

According to the invention as set forth in claim 4, since the speed at the time of confirmation driving can be set by the speed setting means, for example, if the speed is set to a small speed, the positional relationship between the sewing needle and the capturing member is included even during operation. It is possible to confirm sufficiently, and the state at the time of sewing can be confirmed if the speed is set to a high speed, and thus it is possible to freely confirm according to the purpose. According to the invention of claim 5, since the drive amount at the time of confirmation drive can be set by the drive amount setting means, for example, when the confirmation work is desired to be completed in a short time, the drive amount is set small and a little time is spent. If you want to make a precise check even after applying, you can set a large drive amount. In this way, it is possible to confirm according to the purpose and situation. According to the invention described in claim 6, the positional relationship between the sewing needle and the catching member is adjusted to a position where the upper thread can be reliably caught. However, when actually driven, the sewing machine needle and the catching member are If there is a positional deviation between them, the positional deviation can be visually recognized, which is more convenient.

[Brief description of drawings]

FIG. 1 is a control block diagram of a sewing machine as an example of the present invention.

FIG. 2 is a schematic view of a sewing machine needle and a shuttle provided in the sewing machine of FIG.

FIG. 3 shows an example of a screen displayed on the operation panel of FIG. 1, where (a) is a hook capture timing adjustment screen and (b) is a screen.
Is a rotation number setting screen.

FIG. 4 is a flowchart of a hook capture timing adjustment process.

FIG. 5 is a flowchart showing a subroutine of a rotation number / rotational speed setting process.

FIG. 6 is a flowchart showing a subroutine of adjustment axis selection / adjustment processing.

[Explanation of symbols]

1 sewing machine 2 needle bars 3 sewing needle 10 Microcomputer 11 CPU 12 ROM 13 RAM 30 Operation panel 31 hook capture timing adjustment screen 41 Rotation number setting screen 50 Spindle servo motor (needle driving means) 50a Spindle encoder 51 hook shaft servo motor (capturing member drive means) 51a hook shaft encoder

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Shinji Kamakura             1 J, 8-2 Kokuryo-cho, Chofu-shi, Tokyo             Within TUKI CORPORATION F term (reference) 3B150 AA01 CB03 CB27 CE01 CE03                       CE04 CE09 CE23 DB02 DG03                       GD14 GD22 GF02 GF03 GG04                       JA03 JA08 LA02 LA31 LA85                       LA88 LA90 LB01 LB02 NA02                       NA72 NB02 NB18 NC03 NC07                       QA06 QA07 QA08

Claims (6)

[Claims] 1. A sewing machine needle through which a needle thread is passed and which can be moved up and down, a catching member for approaching the sewing machine needle and catching the needle thread at its tip, needle driving means for driving the sewing machine needle, and a catching member. In a sewing machine having a driving means for driving a catching member, and the needle driving means and the catching member driving means are driven independently in synchronization, in advance, the sewing machine needle and the catching member approach each other at a timing at which the upper thread can be caught. Position adjustment means for adjusting the positional relationship between the sewing machine needle and the capture member, a confirmation instruction type step for instructing a confirmation operation to confirm the timing when the two approach each other, and position adjustment in response to an instruction from the confirmation instruction means. A sewing machine comprising: a sewing needle and a confirmation driving means for driving the capturing member from a state adjusted by the means. 2. The sewing machine according to claim 1, wherein the position adjusting means is capable of adjusting the position by selecting each of the sewing machine needle and the capturing member as an adjustment target. 3. The sewing machine according to claim 1, wherein the confirmation driving means drives the sewing needle and the capturing member an integral number of times. 4. The sewing machine according to claim 1, further comprising speed setting means for setting a driving speed during confirmation driving. 5. The sewing machine according to claim 1, further comprising drive amount setting means for setting a drive amount during confirmation drive. 6. A shift display section for displaying a shift between the positions of the sewing machine needle and the catching member capable of reliably catching the upper thread based on the positional relationship between the two.
The sewing machine according to any one of 5 above.