JP2002045584A - Electronically controlled sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply perform an operation in which, after needle location of a sewing needle is changed in the midway of seam forming action, it is returned to the original position. SOLUTION: After an ordinary position and a shifted position are set (S2), when a motor for a sewing machine is driven, sewing action is started and a straight stitch is formed. In addition, when the motor for the sewing machine is stopped (S10) and a shift switch is turned on (S11), amount of movement is calculated (S15) and when it is a timing for the movement (S16), a stepping motor is driven by the amount of movement (S17) and a needle bar is moved. As a result, the needle location of the sewing needle is changed to the shifted position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronically controlled sewing machine used particularly in the field of industrial sewing machines.

For example, a sewing machine motor, a needle bar vertical drive mechanism for reciprocating the needle bar up and down by the driving force of the sewing machine motor, and a needle bar left and right drive for driving the needle bar in the left and right direction. In the electronically controlled sewing machine provided with a mechanism, when changing the needle drop position of the sewing needle in the left-right direction with respect to the work cloth, it has been performed as follows.

That is, during the stitch forming operation, when the sewing needle reaches a predetermined needle drop position, the sewing machine motor is temporarily stopped to interrupt the stitch forming operation, and an arrow for instructing movement in the left-right direction is provided. Operate the key to swing the needle bar left and right. Thereafter, the sewing machine motor is driven to restart the stitch forming operation, thereby changing the needle drop position of the sewing needle.

On the other hand, when the changed needle drop position is returned to the original position, similarly, when the sewing needle reaches a predetermined needle drop position, the sewing machine motor is temporarily stopped to interrupt the stitch forming operation, and Operate the arrow keys to instruct the movement in the direction,
The needle bar is swung right and left to return the needle bar to its original position.

However, in the above-mentioned conventional electronically controlled sewing machine, since the operation of returning the needle drop position after the change of the sewing needle to the original position has been performed visually, it is very difficult to accurately return to the original position. was difficult. In addition, when the needle drop position of the sewing needle is changed and then returned to the original position again, the operator has to remember the needle drop position before the change each time, which is inconvenient.

The present invention has been made in view of the above circumstances, and an object of the present invention is to easily perform an operation of changing a needle drop position of a sewing needle during a stitch forming operation and returning the needle to an original position. To provide an electronically controlled sewing machine.

[0006]

An electronic control sewing machine according to a first aspect of the present invention executes a stitch forming operation on the work cloth while horizontally moving the work cloth relative to a sewing needle. A needle bar up / down drive mechanism for driving the needle bar in the vertical direction by the driving force of a sewing machine motor, a needle bar left / right drive mechanism for driving the needle bar in the left / right direction relative to the work cloth, Position change instructing means for instructing to change the needle drop position of the sewing needle in the left-right direction with respect to the work cloth by relatively moving the needle bar by a left and right drive mechanism; and Storage means for storing a needle drop position of the sewing needle; and a relative movement of the needle bar by the needle bar left / right drive mechanism, so that the needle drop position of the sewing needle is set to the needle drop position of the sewing needle before being changed by the position change instructing means. Return Has a position return indication means for indicating, the characterized in that a control means for controlling the driving of the needle bar left drive mechanism on the basis of the input of the position change instruction means and the position return indication means.

When the operator operates the position change instruction means, the needle bar is relatively moved by the needle bar left / right drive mechanism, and the needle drop position of the sewing needle with respect to the work cloth is changed. Thereafter, when the operator inputs and operates the position return instructing means, the needle bar is relatively moved again by the needle bar left / right driving mechanism, and the needle drop position of the sewing needle with respect to the work cloth is returned to the position before the change. That is,
According to the above configuration, even if the operator changes the needle entry position of the sewing needle during the stitch forming operation by inputting the position change instruction means, the input operation of the position return instruction means is sufficient, The needle drop position can be reliably returned to the original position.

Further, in the above arrangement, by providing a movement amount setting means for setting the relative movement amount of the needle bar by the position change instructing means, the operator can freely set the relative movement amount of the needle bar ( The invention of claim 2).

In this case, the movement amount setting means may be constituted by position input means for inputting a needle drop position of the sewing needle before the change by the position change instructing means and a needle drop position of the sewing needle after the change. Invention), and a movement amount input means for inputting a movement amount of the needle entry position in the left-right direction (invention of claim 4).

It is preferable that the control means ignores the input of the position change instructing means when the sewing machine motor is driven (the invention of claim 5). According to the above configuration, only when the position change instructing means is input while the sewing machine motor is stopped,
Since the input is accepted and the needle bar is moved relatively,
It is possible to prevent a problem that the needle bar is relatively moved at an inappropriate position and the stitch shape is broken.

The electronically controlled sewing machine according to a sixth aspect of the present invention further comprises an on-needle position detecting means for detecting an on-needle position of the sewing needle, wherein the control means sets the on-needle position detection state when the sewing machine motor is stopped. If there is an input from the position change instructing means at a certain time, the needle bar is relatively moved until the next stitch forming operation is started, and when the sewing machine motor is stopped, the needle up position is not changed. When the position change instructing means is input in the detection state, the needle bar is relatively moved after the needle position of the sewing needle is detected at the time of executing the next stitch forming operation. Things.

According to the above configuration, even when the sewing machine motor is stopped, the needle bar is relatively moved when the sewing needle is not at the needle upper position, that is, when the sewing needle is stuck in the work cloth. Problems such as breakage of the sewing needle can be reliably prevented.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. First, FIG. 1 shows an overall configuration of an electronic control sewing machine according to the present embodiment.
In FIG. 1, a sewing machine main body 1 includes a work table 2
A sewing machine bed portion 3 provided on the work table 2; a pillar 4 standing upright at the right end of the sewing machine bed 3; It comprises a sewing machine bed part 3 and an arm part 5 opposed thereto.

A pulley 6 is provided above the right end of the pillar 4. A head 5a of the arm 5 is provided at the left end of the arm 5, and a needle bar extending vertically to the upper surface of the sewing machine bed 3 and supporting a sewing needle 7 is provided below the head 5a. 8 are protruding. The rotation of the pulley 6 and the vertical movement of the sewing needle 7 are configured to interlock.

Further, as shown in FIG.
A cloth presser 9 is provided below the head 5a. A feed dog 10 is provided on a portion of the sewing machine bed 3 facing the cloth presser 9. The work cloth (not shown) placed on the sewing machine bed section 3 is transported by the feed dog 10 in a predetermined transport direction (a front-rear direction indicated by an arrow Y in FIG. 2).

On the other hand, as shown in FIG.
An operation panel 11 is provided on the front of the device. As shown in FIG. 7, the operation panel 11 has a shift key 11 functioning as a position change instruction unit and a position return instruction unit.
a, normal position setting key 11b, shift position setting key 11
c, arrow keys 11d and 11e, and a display unit 11f. As described later, the shift key 11a functions as a position change instruction unit and a position return instruction unit. Also,
Normal position setting key 11b, shift position setting key 11c,
The arrow keys 11d and 11e function as movement amount setting means and position input means.

The work table 2 is provided on a work table 12.
Mounted on top. Below the work table 2 on the work table 12, a sewing machine motor 13 for driving the sewing machine and a control box 14 for controlling each part of the sewing machine are mounted. The control box 14 accommodates a control device 15 (see FIG. 6) and the like. The driving force of the sewing machine motor 13 is a belt 16 (see FIG. 2).
Through the pulley 6. A pedal 17 for instructing a sewing operation is swingably supported at the lower end of the worktable 10. The pedal 17 is configured to be able to swing between a neutral position and a front depressed position depressed on the toe side with respect to the neutral position and a depressed position depressed on the heel side with respect to the neutral position. The pedal 17 is connected to a pedal switch 17a in the control box 12 via a connecting rod 18 extending in a vertical direction.

Next, the internal structure of the sewing machine main body 1 will be described with reference to FIGS. A horizontal rod 19 extending in the left-right direction is provided in the arm portion 5 via a pair of bearings 20, movably in the width direction of the work cloth (the direction indicated by arrow X in FIG. 2). Here, the width direction of the work cloth is orthogonal to the above-described work cloth transport direction (arrow Y direction). An upper shaft 21 extending in the left-right direction is rotatably disposed in the arm portion 5. The right end of the upper shaft 21 protrudes outward from the arm 5, and the pulley 6 is attached to the tip. A rotation operating member 6a is fixed to the right side of the pulley 6.

The needle bar 8 is rotatably driven by the sewing machine motor 13 via a belt 16 and a pulley 6.
It is reciprocated up and down in conjunction with 1. That is, the sewing machine motor 13, the belt 16, the pulley 6, the upper shaft 21 and the like constitute a needle bar vertical movement mechanism. Since the needle bar vertical movement mechanism is well-known, a detailed description thereof will be omitted.

The needle bar 8 is provided inside the head 5a of the arm portion 5 via a U-shaped needle bar support 22 so as to be vertically movable. The needle bar support 22 is connected to one end of the horizontal rod 19. Further, a stepping motor 23 and a link mechanism 24 are disposed in the pillar 4. The link mechanism 24 includes a first link piece 24a and a second link piece 24b rotatably connected to an upper end of the first link piece 24a. The left end of the second link piece 24b is connected to a connecting member 25 fixed to the horizontal rod 19. One end of a lever member 26 is fixed to the output shaft of the stepping motor 23, and the lever member 26
Is rotatably connected to an intermediate portion of the first link piece 24a. With the above configuration, the driving force of the stepping motor 23 is transmitted to the horizontal rod 19.

When the lever member 26 is rotated counterclockwise in the front view by the stepping motor 23, the horizontal rod 19 and the needle bar support 22 are connected via the link mechanism 24.
At the same time, the needle bar 8 is swung to the left. When the lever member 26 is rotated clockwise in the front view by the stepping motor 23, the needle bar 8 is swung to the right together with the horizontal rod 19 and the needle bar support 22 via the link mechanism 24. You. Therefore, the stepping motor 23, the needle bar support 22, the horizontal rod 19, the bearing 20, the link mechanism 2
4 constitutes a needle swing drive mechanism.

A sewing needle 7 is provided on the right side of the pillar 4.
Are provided with a needle down sensor 27 and a needle up sensor 28 capable of detecting the lower limit position and upper limit position, respectively. In the vicinity of the outer periphery of the left end face of the pulley 6, the detection target 2 made of a magnetic material is provided.
9 is fixed. The needle down sensor 27 and the needle up sensor 28 are configured by proximity switches fixed respectively to portions corresponding to the upper limit position and the lower limit position of the rotation trajectory of the detected portion 29. FIG. 5 shows the relationship between the height position of the needle tip of the sewing needle 7 and the rotation angle of the upper shaft 21. In FIG.
The height position of the needle point indicates a length dimension from the upper surface of the sewing machine bed section 3 to the needle point. Also, in FIG.
The rotation angle of the upper shaft 21 when the (needle bar 8) is at the upper limit position is 0 degree, and the rotation angle of the upper shaft 21 when the sewing needle 7 is at the lower limit position is 180 degrees. Also, upper shaft 2
The rotation angle of 1 is 240 to 360 (0) degrees and 0 to 120
In the case of the degree, the needle 7 is at the needle position where the needle tip is located above the upper surface of the sewing machine bed portion 3. When the rotation angle of the upper shaft 21 is 120 to 240 degrees, the needle 7 has It is located at a needle lower position located below the upper surface of the sewing machine bed unit 3. Therefore, the swingable angle a at which the needle bar 8 can swing is 240 degrees between 240 to 360 (0) degrees and 0 to 120 degrees.

Although not shown, the feed dog 10 operates in conjunction with the upper shaft 21, and is a known feed drive for feeding a work cloth when the rotation angle of the upper shaft 21 is the swingable angle a. Driven by a mechanism.

FIG. 6 is a block diagram showing the electrical configuration of the zigzag stitch sewing machine according to this embodiment. The control device 15
For example, it is configured by a circuit mainly composed of a microcomputer, and is configured by connecting an input interface 30, an output interface 31, a CPU 32, a ROM 33, and a RAM 34 to each other via a bus line. The output interface 31 is connected to the sewing machine motor 13 via a drive circuit 35 and the stepping motor 23 via a drive circuit 36. The input interface 30 is connected with a needle down sensor 27, a needle up sensor 28, a pedal switch 17a, a depression amount detection sensor 37, and the operation panel 11.

The ROM 33 controls the drive of the sewing machine motor 13 and the stepping motor 23 in response to an input from the operation panel 11 based on detection signals from the stepping amount detection sensor 37, the needle down sensor 27, the needle up sensor 28 and the like. A control program to be executed is stored.

Here, the pedal switch 17a outputs an output signal linked to the swing position of the pedal 17, and the controller 15 sends an activation signal corresponding to the swing position of the pedal 17 to the sewing machine. It is configured to output to the motor 13. Specifically, the control device 15
When the pedal 17 is at the neutral position, a signal for stopping the sewing operation, when the pedal 17 is at the front depression position, a signal for executing the sewing operation, and when the pedal 17 is at the return position, the sewing end operation is performed. It is configured to output signals to be executed. The sewing end operation is to stop the sewing needle 7 upward at the end of sewing.

Further, the depression amount detecting sensor 37 is
The controller 15 detects the amount of depression when the pedal 17 is depressed to the front depression position, and the control device 15 drives the sewing machine motor 13 in accordance with the amount of depression (sewing speed).
It is configured to adjust.

Based on the driving speed of the sewing machine motor 13, a time T1 when the needle lower sensor 27 detects the lower limit position and then the sewing needle 7 reaches a position above the upper surface of the sewing machine bed portion 3, and the needle upper sensor 28 detects the upper limit position. Then, the time T2 at which the sewing needle 7 reaches below the upper surface of the sewing machine bed section 3 is known. For this reason, the control device 15 is configured to drive the stepping motor 23 at an operation timing at which the needle bar 8 can swing based on these times T1 and T2.
Therefore, in the present embodiment, the needle down sensor 27 and the needle up sensor 2
8. The needle position detecting means is constituted by the control device 15.

Next, the drive control of the sewing machine motor 13 and the stepping motor 23 executed by the control device 15 will be described with reference to FIGS. Note that FIG.
In the above, Si (i = 1, 2, 3,...) Indicates each step. Here, the case where the stitches shown in FIG. 8 are formed will be described as an example.

This control is started when the power is turned on, and first, the shift flag F is set to OFF (S1). Then, a normal position and a shift position are set in step S2. The setting of the normal position and the shift position is performed by a combination of the normal position setting switch 11b and the shift position setting switch of the operation panel 11, and the arrow keys 11d and 11e. For example, when the arrow key 11d is operated after operating the normal position setting switch 11b, the cursor 11g on the scale at the normal position displayed on the display unit 11f moves to the left. The cursor 11g moves to the right. Similarly, when the arrow keys 11d and e are operated after operating the shift position setting switch 11c, the cursor 11h on the scale of the shift position displayed on the display unit 11f moves right and left.

In FIG. 8, the normal position is at the center in the left-right direction,
This shows a state in which the shift position is set to a position shifted three scales to the right from the center. The set normal position data and shift position data are stored in the RAM 34. Therefore, in this embodiment, the RAM 34 functions as a storage unit.

At step S3, the shift flag F is turned on.
Is determined. Here, since the shift flag F is set to OFF (N in S3)
O), the normal position data is read in step S4,
The movement amount (swing amount) of the needle bar 8 is calculated by subtracting the current position data from the read normal position data (step S5).

Next, when the pedal 17 is depressed and moved to the front depression position (YES in step S6), the sewing machine motor 13 is driven (step S7). Subsequently, it is determined whether or not the operation timing is such that the needle point of the sewing needle 7 is located above the work cloth (step S8). If it is the operation timing (YES in step S8), step S5 is performed.
The driving of the stepping motor 23 is controlled by the movement amount calculated in (Step S9), and the process returns to Step S3.
In the stitch forming operation from the point A to the point B, the moving amount is 0.
Therefore, no swing is performed.

When steps S3 to S9 are repeatedly executed to complete the stitch forming operation from point A to point B, the pedal 17 is moved to, for example, the neutral position in step S6 (in step S6). NO), sewing machine motor 13
Is stopped (step S10). Then, when the shift switch 11a is turned on (YE in step S11).
S), the shift flag F is inverted (here, set to “ON”) (step S12), and the determination in step S13 becomes YES, so the process proceeds to step S14 to read shift position data. In step S15, the movement amount (swing amount) of the needle bar 8 is calculated by subtracting the current position data from the read shift position data.

In the following step S16, it is determined whether or not it is operation timing. If it is the operation timing (YES), the stepping motor 23 is driven by the movement amount calculated in step S15 (step S17), and the process returns to step S3.

If it is determined in step S16 that it is not the operation timing (NO), the process returns to step S6, where the pedal 17 is moved to the front depression position (YES in step S6), and the sewing machine motor 13 is turned off. When the motor is driven (step S7) and the operation timing comes (YES in step S8), the stepping motor 23 is driven by the moving amount (step S9), and the process returns to step S3.

As a result, the needle bar 8 is moved rightward, and the needle drop position of the sewing needle 7 is changed to the point C. And, similarly,
By repeatedly executing the processing from steps S3 to S9, the stitch forming operation from point C to point D is performed. Note that when forming the stitch from the point C to the point D, the shift flag F is set to ON (Y in step S3).
ES), the process proceeds to step S18, where the shift position data is read, and the movement amount is calculated by subtracting the current position data from the shift position data (step S5).

When the stitch forming operation from the point C to the point D is completed, the pedal 17 is again moved to the neutral position in step S6 (NO in step S6), and the sewing machine motor 13 is turned on.
Is stopped (step S10). When the shift switch 11a is turned on in this state (Y in step S11).
ES), the shift flag F is inverted and set to "OFF" (step S12). Since the shift flag F is OFF (NO in step S13), the normal position data is read (step S19), and the movement amount of the needle bar 8 is calculated by subtracting the current position data from the read normal position data. (Swinging amount) is calculated (step S15).

If it is the operation timing (YES in step S16), the stepping motor 23 is driven by the movement amount calculated in step S15 (step S17), and the process returns to step S3. If it is not the operation timing (NO in step S16), the pedal 17
Is moved to the front stepping position (YE in step S6).
S), the sewing machine motor 13 is driven (step S7),
When the operation timing comes (YE in step S8)
S), the stepping motor 23 is driven by the moving amount.
As a result, the needle bar 8 is moved to the left, and the needle drop position of the sewing needle 7 is changed to the point E.

As described above, according to the electronic control sewing machine according to the present embodiment, by setting the normal position and the shift position in advance, the shift switch 11 is set in the middle of the stitch forming operation.
When a is operated, the needle bar 8 is swung, and the needle drop position of the sewing needle 7 is changed to a preset shift position. After this,
When the shift switch 11a is operated again, the needle bar 8 is swung to return the changed needle drop position to the original position. That is, even if the needle drop position of the sewing needle 7 is changed during the stitch forming operation, it can be reliably returned to the original position only by operating the shift switch 11a.

In this embodiment, the input signal is received only when the shift switch 11qa is turned on while the sewing machine motor is stopped.
Further, in the present embodiment, the needle bar 8 is configured to swing at the operation timing when the sewing needle 7 is located above the work cloth. Therefore, problems such as the needle bar 8 being swung at an inappropriate position, the needle bar 8 being swung while the sewing needle 7 is stuck in the work cloth, and the sewing needle 7 being broken are generated. Can be reliably prevented.

In this embodiment, a normal position setting switch 11b and a shift position setting switch 11c are provided, and the needle drop position (normal position) before the change by the shift switch 11a and the needle drop position (shift position) after the change are changed. Since the configuration can be set freely, stitches of various patterns can be formed.

Further, since the normal position and the shift position after the setting are displayed on the display unit 11f, the setting contents can be confirmed by looking at the display.

FIG. 10 shows a second embodiment of the present invention, and the points different from the first embodiment will be described.
The same parts as those of the first embodiment are denoted by the same reference numerals.

That is, the second embodiment is characterized in that the shift amount is input instead of setting the shift position. FIG. 10 illustrates steps S2 to S5 in the flowchart of FIG. 9 described above.
The processing executed by the control device 15 instead of the processing described above is shown.

First, in step T1, a normal position and a shift amount are set. Therefore, although not shown, in this embodiment, input means such as a ten-key is provided for inputting the shift amount to the operation panel 11.

Next, normal position data is read in step T2. Then, it is determined in step T3 whether or not the shift flag F is set to ON. If the shift flag F is not ON (NO), the process shifts to step T4 to read the current position data from the read normal position data. By subtracting the position data, the movement amount (oscillation amount) of the needle bar 8 is calculated. On the other hand, when the shift flag F is ON (YES), the process moves to step T5 to read the shift amount data, and the shift position is calculated by adding the read shift amount data to the normal position data. Then, the process proceeds to step T4, where the movement amount (oscillation amount) of the needle bar 8 is calculated by subtracting the current position data from the shift position data. Therefore, even in such a configuration, the same operation and effect as in the first embodiment can be obtained.

It should be noted that the present invention is not limited to the above-described embodiment, and for example, the following modifications are possible. Although the shift switch 11a is configured to serve both as the position change instructing means and the position return instructing means, separate switches may be provided.

That is, a rotation angle detecting device for detecting the rotation angle of the upper shaft such as an encoder may be provided instead of the needle upper sensor and the needle lower sensor. The present invention can also be applied to an electronic control sewing machine such as an embroidery sewing machine having an embroidery frame for holding a work cloth and an embroidery frame moving mechanism for moving the embroidery frame in a horizontal direction with respect to a sewing needle.

[0050]

As is apparent from the above description, according to the electronic control sewing machine of the present invention, the needle bar is moved relative to the work cloth by the needle bar left / right driving mechanism to change the needle drop position of the sewing needle with respect to the work cloth. Position change instructing means for instructing to perform the operation, storage means for storing a needle entry position of the sewing needle before the change by the position change instructing means, and relative movement of the needle bar by the needle bar left and right drive mechanism. Position return instructing means for instructing to return the needle drop position of the sewing needle to the needle drop position of the sewing needle before the change by the position change instructing means is provided, and input of the position change instructing means and the position return instructing means is provided. Is configured to control the drive of the needle bar left and right drive mechanism based on the above, even if the operator operates the position change instruction means to change the needle drop position of the sewing needle during the stitch forming operation. , Simply enter manipulating location return instruction means can be reliably returned to the original position of the needle drop position of the sewing needle.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a sewing machine showing a first embodiment of the present invention.

FIG. 2 is a diagram for explaining an internal configuration of a sewing machine main body.

FIG. 3 is a front view of a right end portion of the arm unit.

FIG. 4 is a right side view of an arm portion.

FIG. 5 is a diagram showing a height position of a needle tip with respect to a rotation angle of an upper shaft.

FIG. 6 is a diagram showing an electric configuration of the electronically controlled sewing machine by combining functional blocks;

FIG. 7 is a diagram showing an operation panel.

FIG. 8 is a diagram illustrating an example of a stitch shape;

FIG. 9 is a flowchart for drive control of a sewing machine motor and a stepping motor.

FIG. 10 is a part of a flowchart for drive control of a sewing machine motor and a stepping motor according to a second embodiment of the present invention;

[Explanation of symbols]

In the figure, 7 is a sewing needle, 8 is a needle bar, 11a is a shift key (position change instructing means, position return instructing means), 11b is a normal position setting key (movement amount setting means, position input means), and 11c is a shift position setting key. (Movement amount setting means, position input means), 11d and 11e are arrow keys (movement amount setting means, position input means), 13 is a sewing machine motor, 15 is a control device (control means, needle position detecting means), 23 is A stepping motor, 27 is a needle lower sensor (needle upper position detecting means), 28
Denotes a needle above sensor (needle above position detecting means).

Claims (6)

[Claims] 1. An electronic control sewing machine for performing a stitch forming operation on a work cloth while horizontally moving the work cloth relative to a sewing needle, wherein a sewing machine motor and a needle bar are moved up and down by a driving force of the sewing machine motor. A needle bar up / down drive mechanism that drives the needle bar in the left / right direction; a needle bar left / right drive mechanism that drives the needle bar in the left / right direction relative to the work cloth; and a relative movement of the needle bar by the needle bar left / right drive mechanism. Position change instructing means for instructing to change the needle drop position of the sewing needle in the left-right direction with respect to the work cloth, and storage means for storing a needle drop position of the sewing needle before the change by the position change instructing means. For instructing the needle bar left / right drive mechanism to relatively move the needle bar to return the needle entry position of the sewing needle to the needle entry position of the sewing needle before being changed by the position change instructing means. An electronic control sewing machine, comprising: a position return instructing unit; and a control unit that controls driving of the needle bar left / right driving mechanism based on inputs of the position change instructing unit and the position return instructing unit. 2. The electronically controlled sewing machine according to claim 1, further comprising a movement amount setting means for setting a relative movement amount of said needle bar by said position change instruction means. 3. The apparatus according to claim 2, wherein the movement amount setting means comprises position input means for inputting a needle drop position of the sewing needle before the change by the position change instruction means and a needle drop position of the sewing needle after the change. The electronically controlled sewing machine according to claim 2, wherein 4. The electronically controlled sewing machine according to claim 2, wherein said moving amount setting means comprises a moving amount input means for inputting a moving amount of the needle drop position of the sewing needle in the left-right direction. 5. The control device according to claim 1, wherein the position change instructing unit receives an input during driving of the sewing machine motor.
5. The method according to claim 1, wherein said input is ignored.
The electronically controlled sewing machine according to any one of the above. 6. An on-needle position detecting means for detecting an on-needle position of the sewing needle, wherein the control means detects the on-needle position while the sewing machine motor is stopped, and detects the on-needle position when the sewing machine motor is stopped. When there is an input, the needle bar is relatively moved until the next stitch forming operation is started, and the position change is performed when the needle position is not detected while the sewing machine motor is stopped. 6. The apparatus according to claim 1, wherein when an instruction is input, the needle bar is relatively moved after the needle position of the sewing needle is detected at the time of executing the next stitch forming operation. An electronically controlled sewing machine as described.