JP2000024349A - sewing machine - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To perform stitch back with a simple operation even when a carriage is in an effective state. When a control device detects that a reverse stitch key is operated in a state where an embroidery device is mounted on a sewing machine frame (step S59), the control device reversely traces embroidery data and sets reverse stitch data. Then, the embroidery frame is moved while moving the sewing needle up and down to form a seam in the reverse direction so as to overlap the seam (step S60). This eliminates the need to sequentially operate the “help key” and the “stitch back key” on the LCD when performing the reverse stitching when the embroidery device 10 is mounted, and can respond by operating the reverse stitch key located at the needle base. The nature increases.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing machine provided with a feed dog for feeding a work cloth in the front-rear direction and a carriage for feeding the work cloth in the front-rear direction and the left-right direction.

[0002]

In the above-mentioned sewing machine, a reverse stitch key is mounted on a front surface of a sewing machine frame to form a stitch on the work cloth while feeding the work cloth in a front-rear direction by a feed dog. When operated, there is a configuration in which a seam is formed in a reverse direction so as to overlap a seam (reverse stitch).

However, in the case of a conventional sewing machine, when embroidering to form a seam on the work cloth while feeding the work cloth in the front-rear direction and the left-right direction by the carriage, the reverse sewing is not performed even when the reverse sewing key of the sewing machine frame is operated. After operating the "help key" displayed on the liquid crystal screen, it was necessary to operate the "stitch back key" to perform reverse stitching, resulting in poor operability.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a sewing machine which can perform stitch back with a simple operation even when a carriage is in an effective state.

[0005]

According to a first aspect of the present invention, there is provided a sewing machine comprising: a feed dog for feeding a work cloth in the front-rear direction; a carriage for feeding the work cloth in the front-rear direction and the left-right direction; Control means for forming a seam on the work cloth while feeding the workpiece.The control means performs reverse stitching or stop stitching based on detecting an operation of a predetermined key in an effective state of the feed dog, thereby enabling the carriage to be activated. It is characterized in that stitch-back is performed based on detecting operation of the same predetermined key in the state. According to the above means, even when the carriage is in the valid state, the stitch back is performed only by operating the predetermined key. Therefore, when performing stitch back in the valid state of the carriage, it is not necessary to sequentially operate the “help key” and the “stitch back key” displayed on the liquid crystal screen, so that operability is improved.

The sewing machine according to the second aspect is characterized in that the control means notifies the degree of stitch back performed in the effective state of the carriage using the notification means. According to the above means, it is convenient to know how much stitch back is performed by operating a predetermined key.

The sewing machine according to the third aspect is characterized in that the control means displays the degree of stitch back performed in the effective state of the carriage on the display means. According to the above means, it is convenient to know how much stitch back is performed by operating a predetermined key. Moreover, the degree of stitch-back can be reported using the existing display means. Therefore, it is not necessary to add a dedicated means for notifying the degree of the stitch back, so that the configuration is prevented from becoming complicated.

The sewing machine according to the fourth aspect is characterized in that the degree of stitch-back performed by the control means in the effective state of the carriage is changed according to the operation contents of a predetermined key. According to the above means, the degree of stitch-back changes according to the operation content of the predetermined key. For this reason, it is not necessary to operate a predetermined key after inputting the degree of stitch back using another key, so that operability is further improved.

The sewing machine according to the fifth aspect is characterized in that a predetermined key is provided on the front surface of the head of the sewing machine frame. According to the above means, the operator can easily reach the predetermined key, so that the operability is further improved.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. First, in FIG.
Are a bed 1a, a free arm 1b projecting leftward from the bed 1a, a pillar 1c extending upward from a right end of the bed 1a, and an arm 1d extending leftward from the pillar 1c. And a head 1e extending downward from the left end of the arm 1d. The bed 1a is provided with a needle plate 1f, and a work cloth (not shown) is placed on the needle plate 1f. Have been. The head 1e corresponds to the head and the needle base of the sewing machine frame 1.

A cloth presser bar 2 is mounted on the head portion 1e of the sewing machine frame 1 so as to be vertically movable, and a cloth presser foot 2a is detachably mounted on the lower end of the cloth presser rod 2. The presser bar 2 is urged downward by a presser spring (not shown), and the work cloth on the needle plate 1f is
a is pressed against the upper surface of the needle plate 1f. As shown in FIG. 7, a sewing machine motor 3 composed of a universal motor is provided in the sewing machine frame 1.
A main shaft 4 is connected to a rotation shaft of the sewing machine motor 3. When the sewing machine motor 3 operates, the main shaft 4 rotates.

A feed dog 5 is mounted on the free arm portion 1b of the sewing machine frame 1, and the feed dog 5 is a feed dog control mechanism 6
Is connected to the main shaft 4. The feed dog control mechanism 6 converts the rotational force of the main shaft 4 into a reciprocating motion force in the front-rear direction and a reciprocating motion force in the vertical direction and transmits the same to the feed dog 5. When the main shaft 4 rotates, the feed dog is moved. 5 moves in the front-back direction and the up-down direction.

The feed dog control mechanism 6 uses a feed dog pulse motor 6a as a drive source, and switches between a forward mode and a reverse mode according to the rotation amount of the pulse motor 6a.
Then, when the mode is switched to the forward mode, the feed dog 5 is raised at the time of forward movement and lowered at the time of backward movement, and the work cloth on the needle plate 1f pressed by the cloth presser foot 2a is fed forward. Further, when the feed dog control mechanism 6 is switched to the retreat mode, the feed dog 5 is lowered at the time of forward movement and rises at the time of retreat, and the work cloth on the needle plate 1f pressed by the cloth presser foot 2a is fed rearward. .

As shown in FIG. 8, a needle bar 7 is mounted on the head portion 1e of the sewing machine frame 1.
As shown in the figure, the needle bar is connected to the main shaft 4 via a needle bar vertical movement mechanism 8. The needle bar vertical movement mechanism 8 converts the rotational force of the main shaft 4 into a reciprocating motion force in the vertical direction and transmits it to the needle bar 7. When the main shaft 4 rotates, the needle bar 7 moves to the feed dog 5. It moves up and down in conjunction. In addition, the lower end of the needle bar 7 is
As shown in FIG. 5, the sewing needle 7a is detachably mounted, and when the main shaft 4 rotates, the work cloth is fed forward or backward by the feed dog 5, and the sewing needle 7a moves up and down so as to penetrate the work cloth. And a seam is formed on the work cloth.

A needle swing mechanism 9 is connected to the needle bar 7 as shown in FIG. The needle swing mechanism 9 uses a pulse motor 9a for swinging as a drive source, and adjusts the swing amount of the needle bar 7 in the left and right direction according to the rotation amount of the pulse motor 9a, and bends the work cloth zigzag. To form a seam. The feed dog control mechanism 6 also has a function of changing the stroke of the feed dog 5 in the front-rear direction according to the amount of rotation of the pulse motor 6a, thereby changing the length of the stitch.

The free arm portion 1b of the machine frame 1 includes:
As shown in FIG. 8, the embroidery device 10 is detachably mounted. Hereinafter, the embroidery device 10 will be described. The frame 11 is detachably mounted on the free arm 1b. An X carriage 12 is mounted on the frame 11 so as to be movable in the left-right direction. An arm-shaped Y carriage 13 is mounted on the X carriage 12 so as to be movable in the front-rear direction. An embroidery frame (not shown) is detachably mounted on the Y carriage 13, and the embroidery frame holds a work cloth.

In the frame 11, as shown in FIG.
An X-direction pulse motor 15 is provided. The rotation axis of the X-direction pulse motor 15 is connected to the X carriage 12 via an X-direction moving mechanism 15a. When the X-direction pulse motor 15 operates, the X carriage 12, the Y carriage 13, and the embroidery frame are integrated. Move left and right. In the frame 11, a Y-direction pulse motor 16 is provided. The rotation axis of the Y-direction pulse motor 16 is Y
The Y carriage 13 is connected to the Y carriage 13 via the direction moving mechanism 16a. When the Y direction pulse motor 16 operates, the Y carriage 13 and the embroidery frame move integrally in the front-rear direction.
The embroidery device 10 is configured as described above.

As shown in FIG. 7, a thread cutting mechanism 17 is provided in the free arm portion 1b of the sewing machine frame 1. The thread cutting mechanism 17 is disposed below the needle plate 1f, and mainly includes a fixed blade and a movable blade (neither is shown). This movable blade is connected to the plunger of the thread cutting solenoid 18, and when the plunger of the thread cutting solenoid 18 protrudes, the movable blade moves with respect to the fixed blade, and both blades move the upper thread to the needle plate 1f.
Cut underneath.

A thread feeding mechanism 19 is provided in the sewing machine frame 1. The yarn feeding mechanism 19 uses a yarn feeding pulse motor 19a as a driving source.
The amount of reeling out of the upper thread from the upper thread spool (not shown) is adjusted in accordance with the amount of rotation of the upper thread spool, and the tension of the upper thread from the upper thread spool to the sewing needle 7a via the balance (not shown) is adjusted. I do.

In the sewing machine casing 1, a control device 20 mainly composed of a microcomputer is provided.
The control device 20 includes a CPU 20a, a ROM 20b, an RA
M20c, an input interface 20d, an output interface 20e, etc., the sewing machine motor 3, the feed dog pulse motor 6a, the needle swing pulse motor 9a, the X direction pulse motor 15, the Y direction pulse motor 1
6, thread cutting solenoid 18, thread feeding pulse motor 19
a is the drive circuits 3a, 6b, 9b, 15b, 16b,
It is connected to an output interface 20e of the control device 20 via 18a and 19b.

A cloth thickness sensor 21 is provided in the head portion 1e of the sewing machine frame 1, and the cloth thickness sensor 21 is connected to an input interface 20d of the control device 20.
The cloth thickness sensor 21 is composed of a potentiometer that outputs a cloth thickness signal of a voltage level corresponding to the height position of the cloth presser bar 2, and the control device 20 controls the cloth thickness signal from the cloth thickness sensor 21. To detect the thickness of the work cloth.

An embroidery sensor 22 is mounted on the free arm portion 1b of the sewing machine frame 1, and the embroidery sensor 22 is connected to an input interface 20d of the control device 20. The embroidery sensor 22 includes a microswitch that is turned on when the embroidery device 10 is mounted on the free arm portion 1b. The control device 20 performs embroidery based on detecting that the embroidery sensor 22 is on. The mode is switched to the practical sewing mode based on detecting that the embroidery sensor 22 is turned off.

A thread break sensor 23 is mounted on the sewing machine frame 1, and the thread break sensor 23 is connected to an input interface 20 d of the control device 20. The thread break sensor 23 is turned on when the balance rises and the tension acting on the upper thread increases, and is turned off when the balance descends and the tension acting on the upper thread decreases. The presence or absence of the upper thread is detected based on the output signal from the thread break sensor 23.

As shown in FIG. 8, a liquid crystal display panel (LCD) 24 is mounted on the arm 1d of the sewing machine frame 1, and the LCD 24 is connected via a drive circuit 24a as shown in FIG. It is connected to the output interface 20e of the control device 20. As shown in FIG. 8, the LCD 24 has a horizontally long rectangular shape.
4 is provided with a horizontally long liquid crystal display section 24b.

A transparent touch panel 25 is mounted on the front surface of the LCD 24. As shown in FIG.
It is connected to the. As shown in FIG. 8, usage keys 25a, advice keys 25b, and the like are printed on the right side of the touch panel 25, and the control device 20 controls the keys 25a and 25b based on an output signal from the touch panel 25. Detect operation details.

A start / stop key 26, a reverse stitch key 27, a needle up / down key 2 are provided on the head 1e of the sewing machine frame 1.
8. The thread trimming key 29 is mounted so as to be able to be pressed.
Behind these keys 26-29, switches 26a-29
a (see FIG. 7), and when the keys 26 to 29 are operated, the rear switches 26a to 29a corresponding to the keys 26 to 29 are turned on. Each of these switches 26
a to 29a are connected to an input interface 20d of the control device 20 as shown in FIG.
0 detects the operation contents of the keys 26 to 29 based on the output signals from the switches 26a to 29a.

As shown in FIG. 8, a card slot 30 is provided in the pillar 1c of the machine frame 1, and when a ROM card 31 is inserted into the card slot 30, FIG. As shown in the figure, the input interface 20d of the control device 20
Is connected to the ROM card 31. ROM card 3
1 stores a plurality of embroidery pattern data for defining the contour shape of the embroidery pattern.

Next, the operation of the above configuration will be described.
The following operation is performed by the control device 20 based on a control program stored in the ROM 20b in advance.
When the power is turned on, the control device 20 proceeds to step S1 in FIG. 3 to execute a predetermined initial operation, and then proceeds to step S2 to detect an output signal from the embroidery sensor 22. Here, when the embroidery sensor 22 is detected to be off, it is determined that the embroidery device 10 is not mounted on the sewing machine frame 1, the mode is switched to the practical sewing mode, and the process proceeds to the practical sewing process in step S3. When the embroidery sensor 22 is turned on, it is determined that the embroidery device 10 is mounted on the sewing machine frame 1, and the embroidery mode is switched to the embroidery mode. Hereinafter, the practical sewing process and the embroidery process will be described in detail.

<Practical sewing process> The control device 20 displays a selection screen of a practical sewing pattern on the screen 24b of the LCD 24 in step S31 of FIG. 2, and proceeds to step S32. FIG. 6 shows the selection screen displayed in step S31. The selection screen displays a plurality of selection keys 32a and the like indicating a practical sewing pattern. When the operator touches a desired selection key 32a on the touch panel 25, the control device 20 outputs an output signal from the touch panel 25. , It is determined that the practical sewing pattern has been selected, and the process proceeds to step S33 in FIG.

At step S33, the control device 20 specifies the touched practical sewing pattern based on the output signal from the touch panel 25, and displays the specified practical sewing pattern and the return key on the screen 24b of the LCD 24. Then, the process shifts to step S34 to determine the operation of the start / stop key 26. Here, when the operation of the start / stop key 26 is detected, the process proceeds to step S35 and the tension of the upper thread (thread tension), the forward feed amount of the work cloth, the backward feed amount of the work cloth, and the sewing needle 7a. After setting the parameters such as the amount of swing in the left-right direction and preparing for creating the practical sewing data, the process proceeds to step S36.

When the control device 20 proceeds to step S36, the control device 20 drives the sewing machine motor 3 through the drive circuit 3a of FIG.
The work cloth is fed forward while moving the sewing needle 7a up and down to form a seam on the work cloth. At this time, if the practical sewing data is created based on the parameters set in step S35 and the data for changing the stitch length and the data for forming the bent seam are set in the practical sewing data, the drive circuits 6b and 9b Feed pulse motor 6a and needle swing pulse motor 9
A pulse signal is given to a to change the feed amount of the work cloth or to swing the needle bar 7 in the left and right direction.

When starting the practical sewing operation, the control device 20 proceeds to step S37 in FIG. 2 and determines whether or not there is a stop request. This stop request is a stop command in the practical sewing data, a stop command signal output from the switch 26a in response to the re-operation of the start / stop key 26, the thread break sensor 23
The control device 20 proceeds to step S38, for example, when a yarn break is detected in step S37, for example.

At step S38, the control device 20 stops driving the sewing machine motor 3, stops the practical sewing operation, and returns to step S34. Here, when non-operation of the start / stop key 26 is detected, step S39 is performed.
Then, the operation of the reverse stitch key 27 is determined. For example, when the operation of the reverse stitch key 27 is detected, step S40 is performed.
Then, the reverse sewing of the practical sewing data is started from the time of the detection of the thread breakage, and the reverse sewing data is set.

When the reverse sewing data is set, the control device 20 supplies power to the sewing machine motor 3. Then, the feed dog pulse motor 6a is drive-controlled to switch the feed dog control mechanism 6 to the retreat mode, and the sewing needle 7 is moved while retreating the work cloth.
a is moved up and down. At this time, if data for changing the length of the stitch or data for forming a bent stitch is set in the reverse stitch data, the feed dog pulse motor 6a
Further, the drive stroke of the needle swing pulse motor 9a is controlled to change the movement stroke of the feed dog 5, or the needle bar 7 is swung in the left and right direction to form a seam in the opposite direction by overlapping the seam.

When the reverse sewing is started in step S40, the control device 20 proceeds to step S41 to determine whether the reverse sewing key 27 is turned off. If it is detected that the reverse stitch key 27 has been turned off, the process proceeds to step S42 to stop the sewing machine motor 3, and then returns to step S34. Therefore, while the reverse stitch key 27 is being operated, reverse stitching is continuously performed.

When the controller 20 detects the operation of the start / stop key 26 after the execution of the reverse sewing, the controller 20 supplies power to the sewing machine motor 3 and sends the work cloth forward while moving the sewing needle 7a up and down. Resume the practical sewing operation. As shown in FIG. 6, a reverse sewing key 32b is displayed on the practical sewing pattern selection screen. When the start / stop key 26 is operated after the reverse sewing key 32b is operated to start the practical sewing operation, the control device 20 detects the thread breakage and stops the sewing operation, and then automatically executes reverse stitching by the set number of stitches. Thereafter, the sewing needle 7a is returned to the start point of the reverse stitch without dropping, and the practical sewing operation is automatically restarted.

When the control device 20 detects the non-operation of the reverse stitch key 27 in step S39 in FIG.
3 and the usage key 25a and the advice key 25
b, The operation of the function keys such as the needle up / down key 28 and the thread trimming key 29 is determined. Here, when the operation of the function key is detected,
The process proceeds to step S44, and after performing a process according to the operation content of the function key, returns to step S34.

When detecting the operation of the usage key 25a or the advice key 25b in step S43, the control device 20 determines in step S44 the screen 24b of the LCD 24.
Displays advice on how to use the sewing machine or sewing. When the operation of the needle up / down key 28 is detected in step S43, power is supplied to the sewing machine motor 3 in step S44. Then, the needle bar 7 is moved up and down to change the height of the sewing needle 7a. In step S43, the thread trimming key 29
When the operation of the drive circuit 1 is detected, the operation proceeds to step S44.
Power is supplied to the thread cutting solenoid 18 through 8a. Then, the thread cutting mechanism 18 is operated to cut the upper thread.

When the control device 20 detects the non-operation of the function key in step S43, the process proceeds to step S45, and determines the operation of the return key on the display screen of the practical sewing pattern. Here, when the operation of the return key is detected, step S
Returning to step 31, the selection screen of FIG. 6 is displayed on the screen 24b of the LCD 24. When the operation of the selection key 32a is detected, the process shifts from step S32 to S33 and S34 in FIG. 1, and the above operation is repeated.

<Embroidery Processing> The control device 20 displays a pattern selection screen on the screen 24b of the LCD 24 in step S51 of FIG. 1, and proceeds to step S52. FIG. 4 shows step S
5 shows a selection screen displayed at 51. The selection screen displays a plurality of selection keys 33a indicating an embroidery pattern. When the operator touches a desired selection key 33a on the touch panel 25, the control device 20
It is determined that the embroidery pattern has been selected based on the output signal from the touch panel 25, and the process proceeds to step S53 in FIG.

At step S53, the control device 20 specifies the touched embroidery pattern based on the output signal from the touch panel 25, and reads out the pattern data corresponding to the specified embroidery pattern from the ROM card 31. Then, display data is created based on the pattern data, and the selected pattern is displayed on the screen 24b of the LCD 24 based on the display data. FIG. 5 shows a screen displayed on the LCD 24 in step S53.
"1" is a stitch back amount, and reference numeral 33b is a return key.

After displaying the selected pattern on the LCD 24, the control device 20 proceeds to step S54 in FIG. 1 and determines the operation of the start / stop key 26. Here, when the operation of the start / stop key 26 is detected, step S55 is performed.
Then, embroidery data is created based on the pattern data read from the ROM card 31. The embroidery data is composed of XY coordinate data indicating the needle drop point for each stitch. When the control device 20 creates the embroidery data, the process proceeds to step S56.

At step S56, the controller 20 supplies power to the sewing machine motor 3 to move the sewing needle 7a up and down. At the same time, the drive circuits 15b and 16
A pulse signal is given to the X-direction pulse motor 15 and the Y-direction pulse motor 16 through b to move the embroidery frame 14 on the XY coordinates (to move in the left-right direction and the front-back direction). At this time, the number of pulse signals applied to the X-direction pulse motor 15 and the Y-direction pulse motor 16 is adjusted based on the embroidery data, thereby controlling the amount of movement of the embroidery frame to form an embroidery pattern on the work cloth.

When the control device 20 starts the embroidery operation,
The process proceeds to step S57, and it is determined whether there is a stop request.
This stop request is based on a stop command in the embroidery data, a stop command signal output from the switch 26a upon re-operation of the start / stop key 26, a color change command in the embroidery data, and an output signal from the thread break sensor 23. The control device 20 proceeds to step S58, for example, when a yarn break is detected in step S57.

At step S58, the control device 20 stops the sewing machine motor 3, the X-direction pulser 15, and the Y-direction pulse motor 16 to stop the embroidery operation, and returns to step S54. Here, the start / stop key 26
When the non-operation of is detected, the process proceeds to step S59, and the operation of the reverse stitch key 27 is determined. For example, reverse key 2
When the operation No. 7 is detected, the process proceeds to step S60, in which the embroidery data is traced backward from the time of the detection of the thread break and reverse stitch data is set for one stitch.

After setting the reverse stitch data for one stitch, the control device 20 supplies power to the sewing machine motor 3 and sets the sewing needle 7a.
Move up and down. At the same time, the X-direction pulse motor 15
Then, the Y-direction pulse motor 16 is drive-controlled to retreat the embroidery frame by one stitch in the left-right direction and the front-rear direction, and form one stitch in the reverse direction so as to overlap the stitch in the reverse direction.

After executing the reverse stitching in step S60, the control device 20 proceeds to step S61 and determines whether the reverse stitching key 27 is turned off. Here, when the ON of the reverse stitch key 27 is detected, the process proceeds to step S62, it is determined whether three seconds have elapsed since the ON of the reverse stitch key 27 is detected in step S59, and the process returns to step S61. For example, when the reverse stitch key 27 is operated by one touch and the pressing time of the reverse stitch key 27 is less than 3 seconds, the control device 2
In the case of 0, it is determined as "YES" in the step S61, and the process returns to the step S54. The stitch back “1” on the screen in FIG. 5 indicates to the operator that one-touch operation of the reverse stitch key 27 performs reverse stitch for one stitch.

When the control device 20 detects that the reverse stitch key 27 has been continuously turned on for 3 seconds or more, the process shifts from step S62 to S63 in FIG. 1 and the next embroidery data in which the reverse stitch data is set in step S60. And reversely, and set reverse stitch data for 9 stitches. Thereafter, power is supplied to the sewing machine motor 3 to drive and control the X-direction pulse motor 15 and the Y-direction pulse motor 16. Then, the embroidery frame is retracted by nine stitches in the left-right direction and the front-rear direction, the stitch is formed on the stitch in the reverse direction by nine stitches, and the process returns to step S54.

When the controller 20 detects the operation of the start / stop key 26 in step S54 after the execution of the reverse sewing, the controller 20 supplies power to the sewing machine motor 3, moves the embroidery frame while moving the sewing needle 7a up and down, and terminates the reverse sewing. Start the embroidery operation from the point.

When the control device 20 detects in step S59 that the reverse stitch key 27 has not been operated, the process proceeds to step S64 to determine the operation of the above-described function key. Here, when the operation of the function key is detected, the process proceeds to step S65,
After performing the process according to the operation content of the function key, the process returns to step S54.

When the control device 20 detects the non-operation of the function key in step S64, the process proceeds to step S66, and determines the operation of the return key 33b in FIG. Here, when the operation of the return key 33b is detected, the process returns to step S51 of FIG. 1 and the selection screen of FIG. When the operation of the selection key 33a is detected,
The process moves from step S52 in FIG. 1 to S53 and S54, and the above-described operation is repeated.

According to the above-described embodiment, stitching back (reverse stitching) is performed only by operating the reverse stitch key 27 even when the Y carriage 13 is in the valid state (when the embroidery device 10 is mounted). For this reason, when performing reverse stitching when the embroidery device 10 is mounted, the “help key” on the LCD 24 is used.
In addition, since it is not necessary to sequentially operate the "stitch back key", the operability is improved.

The degree of reverse stitching performed with the embroidery device 10 mounted is reported. Therefore, when the reverse stitch key 27 is operated while the embroidery device 10 is mounted, it is convenient to know how much the reverse stitch is performed. In addition, the degree of reverse stitching performed with the embroidery device 10 mounted is displayed on the existing LCD 24. For this reason, it is not necessary to add a dedicated means for reporting the degree of reverse stitching, so that the configuration is prevented from becoming complicated.

In addition, the degree of reverse stitching to be performed while the embroidery device 10 is mounted is set to 1 according to the operation time of the reverse stitch key 27.
Changed between needles and 10 needles. This eliminates the need to operate the reverse stitch key 27 after inputting the degree of reverse stitch using another key, thereby further improving operability.

Further, since the reverse sewing key 27 is provided on the head portion 1e of the sewing machine frame 1, the operator can easily reach the reverse sewing key 27. For this reason, the handling at the time of thread breakage can be performed at the needle point, and the convenience is further improved.

In the above-described embodiment, the reverse stitch is executed by one touch operation of the reverse stitch key 27 at the time of embroidering. However, the present invention is not limited to this. For example, the reverse stitch is executed by two or more stitches. It is good also as a structure which carries out. In the case of this configuration, it is preferable to display the number of stitches of the reverse stitch by numerical values on the screen of FIG.

In the above embodiment, the number of reverse stitch stitches is set to 1 according to the operation time of the reverse stitch key 27 during embroidery.
Although the configuration is selected to be the needle or the ten stitches, the present invention is not limited to this. For example, the number of the reverse stitch stitches may be increased in proportion to the operation time of the reverse stitch key 27. In the case of this configuration, when the reverse stitch key 27 is operated, reverse stitching is continuously performed.

In the above embodiment, the embroidery device 1
The reverse stitching was performed when the reverse stitch key 27 was operated in the detached state of 0, but the present invention is not limited to this.
For example, stop sewing may be performed. In the stop sewing, the sewing needle 7a is moved up and down while the work cloth is stopped to drop the needle at the same position a plurality of times. The control device 20 controls the drive of the pulse motor 6a for the feed dog, and the feed dog control mechanism. This is realized by moving the feed dog 5 below the upper surface of the needle plate 1f via 6, and then supplying power to the sewing machine motor 3 to move the sewing needle 7a up and down.

[0059]

As is apparent from the above description, the sewing machine of the present invention has the following effects. According to the first aspect, even when the carriage is in the valid state, the stitch-back is performed only by operating a predetermined key, so that the operability when performing the step-back in the valid state of the carriage is improved.

According to the second aspect of the present invention, the degree of stitch back performed in the effective state of the carriage is notified.
For this reason, since it is known how much the stitch back is performed, the convenience is improved. According to the measure of claim 3,
The degree of stitch-back performed in the valid state of the carriage is displayed on the display means. For this reason, since it is known how much the stitch back is performed, the convenience is improved. Moreover,
Since there is no need to add a dedicated means for notifying the degree of stitch back, the configuration is prevented from becoming complicated.

According to the fourth aspect of the present invention, the degree of stitch back performed in the valid state of the carriage is changed according to the operation of a predetermined key. For this reason, it is not necessary to operate a predetermined key after inputting the degree of stitch back using another key, so that operability is further improved. According to the fifth aspect of the present invention, the predetermined key is arranged on the front surface of the head of the sewing machine frame. For this reason, it is possible to take measures at the time of the needle breakage at the needle point, so that the convenience is further improved.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of the present invention (flow chart showing control contents of a control device in an embroidery mode);

FIG. 2 is a flowchart showing control contents of a control device in a practical sewing mode.

FIG. 3 is a flowchart showing control contents of a control device when power is turned on.

FIG. 4 is a view showing an embroidery pattern selection screen;

FIG. 5 is a diagram showing a display screen of pattern data.

FIG. 6 is a diagram showing a selection screen of a practical sewing pattern;

FIG. 7 is a block diagram showing an electrical configuration and a mechanical configuration.

FIG. 8 is a diagram showing an appearance of a sewing machine frame.

[Explanation of symbols]

1 is a sewing machine frame, 1e is a head (head), 5 is a feed dog, 13 is a Y carriage (carriage), 20 is a control device (control means), 27 is a reverse stitch key (key), and 24 is an LCD (information). Means, display means).

Claims (5)

[Claims] 1. A feed dog for feeding a work cloth in the front-rear direction, a carriage for feeding the work cloth in the front-rear direction and the left-right direction, and a control means for forming a seam on the work cloth while feeding the work cloth by the feed dog or the carriage. The control means performs reverse stitching or stop stitching based on detecting operation of a predetermined key in an effective state of the feed dog, and detects operation of the same predetermined key in an effective state of the carriage. A sewing machine characterized in that a stitch back is performed on the basis of the operation. 2. The embroidery sewing machine according to claim 1, wherein the control means reports the degree of stitch back performed in a valid state of the carriage using the reporting means. 3. The sewing machine according to claim 1, wherein the control means displays on the display means a degree of stitch-back performed in a valid state of the carriage. 4. The sewing machine according to claim 1, wherein the control means changes the degree of stitch-back performed in a valid state of the carriage in accordance with an operation of a predetermined key. 5. The sewing machine according to claim 1, wherein the predetermined key is provided on a front surface of a head of the sewing machine frame.