JP2001162073A - Stop stitching device for zigzag chain sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent generation of yarn escape in execution of stop stitching. SOLUTION: An operator sets swinging widths aw, bw and feed pitches ap, bp of forward and rearward portions (a), (b) of stop stitches. When the feed pitches ap, bp are set, the number of needles an, bn are automatically set. Then, when a zigzag chain sewing michine 1 is started, a sewing processing program is implemented. In the portion (a), data is read out without driving a first solenoid 53, and while an object to be sewn H is fed successively in the normal direction by the length corresponding to the size of the pitch ap a sewing needle 16 is swung only by the size corresponding to the swing width aw so as to form stithes (S1-S7). In the portion (b), on the other hand, the solenoid 53 is driven to read out data, and then while the object H is fed successively by the length corresponding to the size of the feeding pitch bp the needle 16 is swung only by the size corresponding to the swing width bw to thereby form stitches (S8-S14).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for a zigzag sewing machine for forming a zigzag stitch, and performs a stop stitch by changing a swing amount of a sewing needle before and after reversing a feed direction applied to a workpiece. The present invention relates to a sewing device for performing sewing.

[0002]

2. Description of the Related Art Conventionally, in a sewing operation using a straight stitch sewing machine, at least one of a sewing start operation and a sewing end operation is generally performed by reversing a feeding direction of a workpiece in order to prevent a thread coming off. It is being done. For example,
Two types of so-called V-stops and N-stops are widely used as straight stitches. FIG. 20 is a diagram showing a V-stop at the start of sewing in straight stitching, and FIG. 21 is a diagram showing a V-stop at the end of sewing in straight stitching. FIG. 22 is a diagram showing N stops at the start of sewing in straight stitching, and FIG. 23 is a diagram showing N stops at the end of sewing in straight stitching. In addition, the stop stitch is actually sewn on the same line as the lock stitch, but for convenience of explanation, the lock stitch is shown slightly shifted from the lock stitch.

As shown in FIG. 20, the V-stop is moved from the first needle dropping position in the direction opposite to the feed direction (the direction indicated by the arrow Z in the drawing:
After forming several seams in the “reverse direction”),
It is formed by performing the main sewing in the direction of the feed of the workpiece (the direction of arrow Y in the figure: hereinafter referred to as the “forward direction”).
The V-stop may also be formed by forming several stitches in the reverse direction (the direction of the arrow Z) after the completion of a predetermined amount of lock stitches, as shown in FIG.

On the other hand, as shown in FIG. 22, the N-stop is formed by forming several stitches in the forward direction (arrow Y direction) and then forming several stitches in the reverse direction (arrow Z direction). It is formed by performing a lockstitch in the direction (arrow Y direction). Also, as shown in FIG. 23, after the final stitching is completed, several seams are formed in the reverse direction (arrow Z direction), and then several seams are again formed in the normal direction (arrow Y direction). It is also formed by forming. Such a V-stop and an N-stop can prevent the thread from coming off because the later formed seam presses the previously formed seam.
Here, in general, it can be said that the smaller the seam, the harder it is for the thread to come off.

It is conceivable to apply the V-stop or the N-stop of the straight stitch sewing machine to perform the stitch at the staggered stitch also in the staggered stitch sewing machine. FIG. 24 is a diagram illustrating N-stopping by a conventional staggered sewing machine. In the conventional zigzag stitch sewing machine, the lock stitch and the lock stitch are actually formed in an overlapping manner, but the lock stitch is slightly displaced from the lock stitch in FIG. 24 for convenience of explanation.

The staggered sewing machine intermittently swings a sewing needle in a swing direction orthogonal to the direction of feeding of a sewing object while moving and transporting the sewing object in a forward direction (arrow Y direction) by a predetermined amount.
A predetermined staggered stitch is formed on the workpiece according to a predetermined sewing order of the stitch data created based on the swing width corresponding to the swing amount of the sewing needle in the swing direction and stored in the memory. Fig. 24 shows the N-stop with this type of staggered sewing machine.
As shown in the figure, after forming several stitches in the forward direction (arrow Y direction) of the workpiece, several stitches are formed in the reverse direction (arrow Z direction), and then, in the forward direction (arrow Y direction). A zigzag stitch is formed in the Y direction) as the final stitch. In other words, the N-stop in the staggered sewing machine forms the stop stitch by reversing only the feed direction while keeping the swing amount and the number of stitches of the sewing needles constant. By performing such stop stitching, a stitch formed later overlaps a stitch formed earlier, and it becomes difficult to remove a thread.

[0007]

However, in the above-mentioned conventional staggered sewing machine, even if the staggered stitches are formed at the same feed pitch (conveyance amount) as the straight stitches, the stitches are swung by the swing of the sewing needle. It tends to be larger than straight stitching. Therefore, there is a problem that the thread is more easily removed in the conventional stitching by the staggered stitching than in the stitching formed by the straight stitches.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and has as its object to provide a sewing device capable of preventing a thread from coming off during stitching by staggered sewing.

[0009]

According to a first aspect of the present invention, a sewing machine is provided with a feed at a predetermined pitch in a predetermined direction, and the sewing needles are set at a predetermined staggered width in a direction intersecting with the feed direction. It is used in a zigzag sewing machine that forms a zigzag stitch on a sewing object by swinging, and performs a stop stitch on the sewing object. The sewing machine further comprises a sewing control means for controlling the staggered sewing machine to reverse the direction and change the swing width of the sewing needle before and after the reverse rotation. According to the configuration of the present invention, when the sewing needle is swung by a predetermined amount to form a predetermined number of stitches while feeding the workpiece at a predetermined feed pitch (conveyance amount), the feeding is reversed. In accordance with the reverse rotation of the feed, the swing width of the sewing needle is changed, and the seam formed after the reverse rotation of the feed is formed with a different swing width from the seam formed before the reverse rotation of the feed. Therefore, the stitch formed before the reverse rotation of the feed and the stitch formed after the reverse rotation of the feed are formed to intersect.

Further, the present invention provides a feed pitch control means for controlling a staggered sewing machine in order to change the feed pitch of a workpiece before and after the feed direction is reversed at the time of stop sewing. It is characterized by having. According to the configuration of the above invention, in addition to the operation of the invention of claim 1, in the staggered sewing machine, when a predetermined number of stitches are formed while feeding the workpiece in a predetermined direction at a predetermined feed pitch, the feed direction is reversed. Is done. The feed pitch is changed in accordance with the reverse rotation of the feed, and the stitch formed after the reverse rotation of the feed is formed at a feed pitch different from the stitch formed before the reverse rotation of the feed. Therefore, the seam of the stop stitch is formed more densely.

According to a third aspect of the present invention, in the second aspect, the number of stitches forming the stitches before and after the feed pitch is changed by the feed pitch control means is controlled. The number of stitches control means is provided. According to the configuration of the present invention, in addition to the operation of the invention described in claim 2, when a predetermined number of stitches are formed in the staggered sewing machine, the feed is reversed and the feed pitch is changed. The number of stitches is changed according to the change of the feed pitch, and the stitch after the reverse rotation of the feed is formed with a different number of stitches from the stitch before the reverse rotation of the feed. Here, the number of stitches refers to the number of times the sewing needle moves up and down. Therefore, the operator does not need to set the number of stitches in accordance with the feed pitch.

The invention described in claim 4 is the first invention.
A swing width setting means for arbitrarily setting the swing width of the sewing needle in the stop sewing is provided in the invention according to any one of the third to third aspects. According to the configuration of the present invention, in addition to the operation of any one of the first to third aspects, the swing width of the lock stitch is adjusted by a keyboard, a setting switch, or the like in accordance with the thickness of the workpiece and the use of the workpiece. When input, the swing width is stored in a RAM or the like. This allows
The swing width of the lock stitch is set arbitrarily.

The invention described in claim 5 is the first invention.
The invention according to any one of claims 4 to 4, further comprising a feed pitch setting means for arbitrarily setting a feed pitch of the sewing material in the stop sewing. According to the configuration of the present invention, in addition to the operation of any one of claims 1 to 4, when the feed pitch of the lock stitch is input by using a keyboard, a setting switch, or the like in accordance with the thickness or use of the sewing object, the feed is performed. The pitch is stored in a RAM or the like. Thereby, the feed pitch is set arbitrarily.

According to a sixth aspect of the present invention, the sewing machine is provided with a feed at a predetermined pitch in a forward direction to the sewing object and swings the sewing needles at a predetermined staggered width in a direction intersecting the feed direction. Used in a zigzag sewing machine that forms a series of a large number of zigzag stitches on a sewn product, and performs a stop stitch on a workpiece at at least one of a start end and an end of a series of zigzag stitches, Controls the zigzag stitch sewing machine to reverse the direction of the feed applied to the workpiece in the middle of the stop sewing and to change the swinging width of the sewing needle between the forward portion before the reverse rotation and the retreat portion after the reverse rotation. The sewing machine further comprises a sewing control means for performing sewing. According to the configuration of the present invention, when the sewing needle is swung by a predetermined amount while feeding the workpiece at a predetermined feed pitch (conveyance amount), a predetermined number of stitches are formed.
The feed is reversed. In accordance with the reverse rotation of the feed, the swing width of the sewing needle is changed, so that the seam formed in the retreating portion of the lock stitch is formed with a different swing width from the seam formed in the advance portion of the fixing stitch. Therefore, the stitches formed before and after the reverse rotation of the feed are formed so as to intersect.

The invention described in claim 7 is the same as the claim 6.
In the invention described in (1), a feed pitch control means for controlling the staggered sewing machine to individually change the feed pitch of the workpiece in the advance portion and the retreat portion of the stop sewing is provided. According to the configuration of the present invention, in addition to the operation of the invention according to claim 6, in a staggered sewing machine, when a predetermined number of stitches are formed while feeding a workpiece in a predetermined direction at a predetermined feed pitch, Is reversed. In response to this, the feed pitch is changed, and the stitch formed at the retreating portion of the lock stitch is formed at a feed pitch different from that of the seam formed at the advance portion of the lock stitch. Therefore, the seam of the stop stitch is formed more densely.

The invention described in claim 8 is the same as the claim 7.
The invention according to the above, further comprising a stitch number control means for controlling the number of stitches forming a stitch in the advance portion and the retreat portion of the lock stitch in which the feed pitch is changed by the feed pitch control means, I do. According to the configuration of the present invention, in addition to the effect of the invention described in claim 7, when a predetermined number of stitches are formed, the feed is reversed and the feed pitch is changed. The number of stitches is changed in accordance with the change of the feed pitch, and the number of stitches formed at the retreating portion of the stitch is formed with a different number of stitches than the number of stitches formed at the advancing portion of the stitching. Therefore, the operator does not need to set the number of stitches in accordance with the feed pitch.

The invention according to claim 9 is the invention according to claim 6.
In the invention described in any one of the above items (1) to (8), a swing width setting means for individually setting the swing width of the sewing needle in the advance portion and the retreat portion of the lock stitch separately from the predetermined staggered width is provided. It is characterized by having. According to the configuration of the present invention, in addition to the operation of any one of claims 6 to 8, the swing width of the lock stitching advance portion and the lock stitch retreat portion is adjusted according to the thickness of the material to be sewn or the use of the material to be sewn. Input from a keyboard or setting switch, the swing width is stored in a RAM or the like. As a result, the swing widths of the forward lock stitching portion and the reverse lock stitch portion are separately set.

According to a tenth aspect of the present invention, in the inventions of the sixth to ninth aspects, the feed pitch of the workpiece at the forward portion and the backward portion of the lock stitch is set independently of the staggered stitch. And a feed pitch setting means for setting the feed pitch. According to the configuration of the above invention, in addition to the function of any one of claims 6 to 9, a keyboard and an installation switch are provided in accordance with the feed pitch of the lock stitch advance portion and the lock stitch retreat portion in accordance with the thickness and use of the workpiece. And the like, the feed pitch is stored in a RAM or the like. As a result, the feed pitches of the lock stitch advance portion and the lock stitch retreat portion are separately set.

Further, according to an eleventh aspect of the present invention, in the invention according to any one of the sixth to tenth aspects, the number of needles in the advance portion and the retreat portion of the lock stitch are separately set. A number setting means is provided. According to the configuration of the present invention, in addition to the function of any one of claims 6 to 10, the number of stitches of the forward stitching portion and the backward stitching portion of the lock stitch is adjusted by a keyboard, a setting switch, or the like in accordance with the use of the workpiece. When input, the number of stitches is stored in the RAM or the like. Thus, the number of stitches of the forward stitching portion and the backward stitching portion is independently set without depending on the feed pitch or the like.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) Hereinafter, a first embodiment of a stitching device for a staggered sewing machine according to the present invention will be described in detail. FIG. 1 is an external perspective view of a staggered sewing machine 1 according to the present embodiment.

In FIG. 1, a staggered sewing machine 1 includes a sewing machine bed 3 provided on a work table 2, a pillar 4 erected from the right end of the machine bed 3,
An arm 5 extending leftward from the pillar 4 so as to face the sewing machine bed 3.

The work table 2 is mounted on a work table 6. A drive motor 7 for driving the zigzag sewing machine 1 and a control box 8 for performing main control of the zigzag sewing machine 1 are attached below the work table 2 on the work table 6. A pedal 9 for operating a sewing operation by the staggered sewing machine 1 is swingably supported at a lower end portion of the worktable 6. The pedal 9 is connected to the control box 8 via a connecting rod 10 extending in the vertical direction.

The pedal 9 is configured to swing between a neutral position, 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. I have. The control box 8 outputs a stop signal for stopping the sewing operation when the pedal 9 is in the neutral position, an execution signal for executing the sewing operation when the pedal 9 is in the front depressed position, and a control signal when the pedal 9 is depressed. In the case of the return position, there is provided a pedal sensor 9A (see FIG. 9) for outputting a sewing signal for executing sewing. Here, the stop sewing is
It is formed at least at one of the sewing start and the sewing end.

On the front side of the housing of the control box 8, there are provided a forward feed pitch setting switch 11a, a reverse feed pitch setting switch 11b, a swing width setting switch 11c, a mode changeover switch 11d, a decision switch 11e, and the like.

A drive motor 7 is provided above the right end of the pillar 4.
Is provided with a pulley 15 which is drivingly connected to the pulley 15. A sewing needle 16 projects perpendicularly to the upper surface of the sewing machine bed 3 from below the left end of the head of the arm 5. Pulley 1
The rotation of the sewing needle 16 and the vertical movement of the sewing needle 16 are interlocked, and the vertical movement position of the sewing needle 16 can be adjusted by manually rotating the pulley 15. Here, the sewing material H is placed between the sewing machine bed portion 3 and the sewing needle 16 and is used for sewing.

Next, a swing mechanism for swinging the sewing needle 16 in a direction orthogonal to the direction of feeding the workpiece H will be described with reference to FIG. FIG. 2 is a perspective view showing a main part of a swing mechanism of the staggered sewing machine 1. As shown in FIG. 2, the needle bar 1 supporting the sewing needle 16 is provided from below the head of the arm portion 5.
The tip of 7 protrudes. A cloth holder 18 is provided below the head of the arm 5. Sewing machine bed part 3
On the upper side, a feed dog 19 is provided at a position facing the cloth holder 18. The feed dog 19 is driven by a horizontal feed mechanism to be described later, and conveys the sewing material H intermittently in the front-rear direction.

The needle bar 17 is held vertically via a U-shaped needle bar holder 20. The needle bar holder 20 is
It is connected to one end of a shaft 21 disposed horizontally in the arm 5. The shaft 21 includes a shaft holding portion 22
The workpiece H is swingably held in the width direction (the direction of the arrow X) of the sewing object H via the. Here, the width direction (arrow X direction) of the sewing object H is orthogonal to the feed direction of the sewing object H (arrow Y direction). Near the center of the shaft 21, the connecting member 2
3 are provided. The pulse motor 2 is provided in the pillar 4.
Four and a plurality of link members 25 are provided. The driving force of the pulse motor 24 is configured to be transmitted from the plurality of link members 25 to the shaft 21 via the connecting members 23.

Therefore, the swing amount of the sewing needle 16 in the swing direction (arrow X direction) is determined by the drive amount of the pulse motor 24. The drive amount of the pulse motor 24 is controlled by a pulse signal generated by a pulse generator 26.

In the vicinity of the pulse generator 26, the sewing needle 16
An operation timing generation device 27 for detecting the timing of swinging the oscillating motion is provided. The operation timing generator 27 includes a light emitting and receiving element, receives reflected light from a reflecting section (not shown) provided on the pulley 15, and outputs a signal. The reflector (not shown) is provided with a reflector for an operation timing signal, a reflector for a needle above signal, a reflector for a signal below a needle, and the like at predetermined intervals.

In the arm 5, a rotary shaft 28 having a U-shaped crank 28a is provided horizontally. Connecting rods 29 and 32 are connected to the rotating shaft 28. One end of the rotating shaft 28 is fixed to the pulley 15 so as to rotate integrally with the pulley 15.

Next, a schematic configuration of a horizontal feed mechanism for driving the feed dog 19 in the front-rear direction and the vertical direction will be described with reference to the drawings. FIG. 3 is a perspective view showing a main part of the horizontal feed mechanism. FIG. 4 shows a switch 41 in a state where the feed is zero.
FIG. FIG. 5 is a diagram illustrating the switch 41 in a state where the feed is in the forward direction. FIG. 6 is a diagram illustrating the switch 41 in a state where the feed is in the reverse direction. FIG. 7 is a diagram illustrating the feed pitch variable mechanism 55 in a state where the feed is in the forward direction, and FIG. 8 is a diagram illustrating the feed pitch variable mechanism 55 in a state where the feed is in the reverse direction.

As shown in FIG. 3, a lower end of a connecting rod 29 having an upper end connected to the crank 28a of the rotating shaft 28 has
A vertical feed rod 30 horizontally disposed in the sewing machine bed 3
Are connected. For this reason, when the rotation shaft 28 rotates, the vertical feed rod 30 reciprocates vertically according to the connecting rod 29. The vertical feed rod 30 has a bifurcated arm 31.
Is fixed.

As shown in FIG. 4, an upper end of a connecting rod 32 extending vertically is rotatably fitted to the rotating shaft 28 via an eccentric cam 33. A horizontal feed shaft 34 rotatably supported by the sewing machine bed 3 is provided below the rotary shaft 28. A swing arm 35 is fixed to the horizontal feed shaft 34. A pair of link members 38 are respectively connected between the support shaft 36 fixed to the swing arm 35 and the support shaft 37 fixed to the lower end of the connecting rod 32. The front ends of the pair of rotary levers 39 are rotatably supported by the support shaft 37, and the rear ends of the rotary levers 39 are connected to the switch 41 by the support shafts 40.

As shown in FIG. 7, a feed pitch adjuster 43 is provided below the rotary shaft 28. The feed pitch adjuster 43 is rotatably supported by a support shaft 44, and has a front end formed with a bifurcated portion having a substantially L-shaped side surface. The bifurcated portion includes a pair of upper and lower feed pitch adjusting surfaces 45.
Are formed respectively. A vertically extending tension spring (not shown) is stretched between the rear end of the feed pitch adjuster 43 and the machine frame, and the feed pitch adjuster 43 is constantly urged clockwise in the drawing. The upper end of a connecting rod 46 extending vertically is connected to the rear end of the feed pitch adjuster 43. The lower end of the connecting rod 46 is connected to the switch 41 via the support shaft 40 as shown in FIG.

A feed pitch adjusting knob 47 for arbitrarily setting the feed pitch p is screwed into the machine frame of the pillar 4. The rear end of the feed pitch adjusting knob 47 is in contact with the lower feed pitch adjusting surface 45 of the feed pitch adjuster 43. When the feed adjusting knob 47 is rotated to move the rear end portion forward or backward, the inclination angle of the feed pitch adjuster 43 is displaced, the connecting rod 46 is moved up and down, and the feed pitch of the feed dog 19 in the forward direction is reduced. Be changed. As shown in FIG. 3, the feed dog 19 is provided on a feed base 48 rotatably supported by the horizontal feed shaft 34. Slide 48
A shaft 50 with which the fork arm 31 is engaged is fixed to an arm 49 provided on the front end surface of the arm.

Therefore, the connecting rod 32 reciprocates in the vertical direction via the eccentric cam 33 by the rotation of the rotary shaft 28, so that the link member 38 swings about the support shaft 36 as the center of rotation and the rotating lever 39 and the switch 41 are the support shaft 4
The oscillating motion is performed with 0 as the center of rotation. At this time, as shown in FIG. 5, when the support shaft 40 is not located on the line LL connecting the support shafts 36 and 37, the rotation center positions of the link member 38 and the rotation lever 39 are not on a straight line. The swinging motion of the swinging arm 35 occurs, and the horizontal feed shaft 34 and the feed base 4 are moved.
8, the feed dog 19 reciprocates in the front-rear direction.
Further, since the feed base 48 is connected to the vertical feed rod 30 via the shaft 50, the feed base 48 reciprocates in the vertical direction together with the vertical feed rod 30. As a result, the feed base 48 and the feed dog 19
Makes a four-feeding motion, and the workpiece H can be fed in the forward direction. The feed pitch can be set arbitrarily by adjusting the feed pitch adjustment knob 47. In carrying out this embodiment, the feed pitch is controlled by a second solenoid 57 described later.
The rear end of the feed pitch adjustment knob 47 is retracted to the rear so that the control by the second solenoid 57 is not restricted.

Next, a reversing mechanism for reversing the feed direction of the feed dog 19 will be described with reference to the drawings. As shown in FIGS. 3 and 6, the rotating shaft 2
A feed adjusting shaft 51 parallel to 8 is rotatably supported by a machine frame (not shown). A front end of a connecting lever 52 is fixed to one end of the feed adjusting shaft 51, and a rear end of the connecting lever 52 is connected to a connecting rod 46. The front end of the plunger 53a of the first solenoid 53 disposed near the connecting rod 46 is rotatably connected to the feed adjusting shaft 51 via a connecting arm 54. When the first solenoid 53 is not driven, the plunger 53a is retracted into the first solenoid 53. Therefore, the feed adjustment shaft 51 is at a predetermined forward rotation position, and the connecting rod 46 is moved up and down according to the inclination of the feed pitch adjuster 43. On the other hand, when the first solenoid 53 is driven, the plunger 53a projects forward,
The connecting arm 54 rotates in a predetermined direction, and the connecting rod 46 moves upward. At this time, the rear end of the feed pitch adjusting knob 47 shown in FIGS.
3 moves upward until it comes into contact with the upper feed pitch adjusting surface 45. As a result, as shown in FIG.
9 and the inclination angle of the switch 41 are changed. That is,
The switch 41 includes a line LL connecting the support shaft 40 to the support shafts 36 and 37.
, A swinging motion for reverse feed is generated in the swing arm 35, and the feed direction of the feed dog 19 is reversed.

Next, the variable feed pitch mechanism 55 will be described with reference to FIGS. As shown in FIG. 7, the variable feed pitch mechanism 55 mainly includes a second solenoid 57 supported by a bracket 56 fixed to the pillar 4. A lock lever 60 is connected to a rotation shaft of the second solenoid 57 via a solenoid link 58 and a lock link 59. The lock lever 60 is
It is rotatably held on a support shaft 44 together with the feed pitch adjuster 43.

Accordingly, when the second solenoid 57 is driven so that the rotation shaft rotates counterclockwise, the lock lever 6
0 and the feed adjuster 43 rotate clockwise about the support shaft 44, and the connecting rod 46 moves downward. On the other hand, when the second solenoid 57 is driven so that the rotation shaft rotates clockwise, the lock lever 60 and the feed adjuster 43 rotate counterclockwise about the support shaft 44 as shown in FIG. The connecting rod 46 moves upward. Thus, the feed pitch can be forcibly changed without using the feed pitch adjustment knob 47.

Next, an electrical configuration of the sewing device according to the present embodiment will be described with reference to FIGS.
FIG. 9 is a block diagram showing a main configuration of the control box 8. FIG. 10 shows a forward feed pitch setting switch 1
It is a figure which shows 1a. FIG. 11 is a diagram illustrating the reverse feed pitch setting switch 11b. FIG. 12 is a diagram illustrating a zigzag stitch formed by the zigzag sewing machine 1.

In the control box 8, as shown in FIG.
Forward feed pitch setting switch 11a, reverse feed pitch setting switch 11b, swing width setting switch 1 described above
1c, mode changeover switch 11d, decision switch 11e
In addition, the pedal sensor 9A, pulse generator 26, drive motor 7, pulse motor 24, operation timing generator 27, first solenoid 53, second solenoid 57, RA
An M61, a ROM 62, a CPU 63, and the like are provided. These are connected to each other via a bus 64.

The forward feed pitch setting switch 11a is
This is a switch for inputting a feed amount for one stroke movement of the sewing needle 16 when the first solenoid 53 is not driven as a feed pitch p. The forward feed pitch setting switch 11a is of a volume type as shown in FIG. Reverse feed pitch setting switch 1
Reference numeral 1b denotes a switch for inputting, as a feed pitch p, a feed amount for one stroke movement of the sewing needle 16 when the first solenoid is driven. The reverse feed pitch setting switch 11b is of a volume type as shown in FIG. 11, and if the set value is set to a negative value, the feed pitch when the feed is in the reverse direction can be set. On the other hand, if it is set to a plus value, the feed pitch in the forward direction is set. The forward feed pitch setting switch 1
When the feed pitch p is set by 1a and the reverse feed pitch setting switch 11b, the number of stitches n is automatically set.

The swing width setting switch 11c is a switch for setting the swing of the sewing needle 16 in the direction orthogonal to the direction in which the workpiece H is fed as the swing width w.
The mode changeover switch 11d is used to set a swing width w and the like when performing the stop sewing in the forward direction at the start of sewing.
A second mode for setting a swing width w and the like when performing the reverse sewing at the start of sewing and a third mode for setting a swing width w and the like when performing the reverse sewing at the end of sewing. This is a switch for selectively switching between a mode and a fourth mode for setting a swing width w and the like at the time of performing sewing in the forward direction at the end of sewing. The decision switch 11e is a switch for storing set values such as the swing width w in the RAM 61.

As shown in FIG. 12, these switches are operated by switching a mode changeover switch 11d to adjust a forward feed pitch setting switch 11a, a reverse feed pitch setting switch 11b and a swing width setting switch 11c. The dynamic width w (“W” shown), the feed pitch p (“P” shown), and the number of stitches n (the number of “●” shown) are set,
The user presses the decision switch 11e. Thus, the swing width w and the like in the mode designated by the mode switch 11d are stored in the RAM 61. Here, the number of stitches n refers to the number of needle drops of the sewing needle 16. In addition, the swing width w is
Is the amount to move in the direction orthogonal to the transport direction,
Specifically, it refers to the amount by which the sewing needle 16 moves from one black circle to the next black circle in a direction orthogonal to the transport direction (arrow Y direction).
The feed pitch p refers to the amount by which the sewing object is sent in a predetermined direction. Specifically, the sewing needle 16 moves from one ● to the next ●.
Means the amount of movement in the feed direction (arrow Y direction).

The RAM 61 includes a stitch table 61A storing stitch data and the like, and is configured to read and write data necessary for executing various control operations by the control box 8. The ROM 62 stores various sewing control programs such as a sewing processing program for executing a sewing operation to be described later. CPU63
Is a central processing unit that controls the entire operation of the zigzag sewing machine 1, and manages all data relating to the operation of the zigzag sewing machine 1.

Here, the stitches formed by the staggered sewing machine 1 will be described with reference to FIGS. FIG.
16 is a diagram illustrating a first specific example of a stitch formed by the stitching device of the staggered sewing machine 1 according to the first embodiment, and FIG. 15 is a diagram illustrating a stop stitch at the start of sewing. FIG.
FIG. 6 is a view showing stop sewing at the end of sewing.

As shown in FIG. 15, for example, the zigzag stitch sewing machine 1 has a zigzag stitch at a predetermined feed pitch p and a predetermined swing width w in a forward direction (arrow Y direction) from an initial needle drop position (START). After forming several stitches (hereinafter referred to as "a portion"), the feed is reversed to form several straight stitches at a predetermined feed pitch p in the reverse direction (the direction of arrow Z) (hereinafter referred to as "b portion").
). Then, when a predetermined amount of lockstitch is formed in the forward direction (arrow Y direction) (hereinafter referred to as “c portion”), the feed is reversed to a predetermined feed pitch in the reverse direction (arrow Z direction) as shown in FIG. p to form several straight stitches (hereinafter referred to as “d part”).
), The feed is reversed again, and the forward direction (arrow Y direction)
Then, several zigzag stitches are formed at a predetermined feed pitch p and a predetermined swing width w (hereinafter referred to as “e part”). As described above, in the zigzag sewing machine 1, the zigzag stitches (a and e) and the straight stitches (b) formed before and after the reversal of the feed in the stop stitching.
And the lock stitch are performed so that the cross stitch and the lock stitch cross each other to press each other.

The stitches at the portions a to e are CP
The U63 is formed by controlling some programs stored in the ROM 62 to operate the sewing needle 16 and the feed dog 19. The sewing processing program unique to the present invention is one of those executed by the CPU 63,
Swing width w, feed pitch p and number of stitches n
Is controlled so as to form a seam while changing. Hereinafter, the contents of the sewing processing program will be described with reference to FIGS.
This will be described with reference to FIG. FIG. 13 is a flowchart showing the contents of the sewing processing program, and FIG. 14 is a sub-flowchart of FIG.

First, the stop sewing process at the start of sewing will be described with reference to FIGS. When the operator steps on the pedal 9, the processing of this routine is started. First, step (hereinafter referred to as “S”) 1
, The first solenoid 53 is turned off. The first solenoid 53 is for reversing the feed direction of the feed dog 19. Therefore, the first solenoid 53 is turned off.
When the sewing is performed, the work H is sent in the forward direction.

Next, in S2, it is determined whether or not the number of stitches a in section a is 0. The number a of stitches in the a section refers to the number of times the sewing needle 16 moves up and down to form a stitch, and the a section feed pitch a
Is set automatically when is set. Number of stitches an
Is 0 (S2: YES), it means that the sewing of the section a has been completed, and the process proceeds to S8. On the other hand, the number of stitches an
Is not 0 (S2: NO), it means that the sewing of the section a has not been completed, and the process proceeds to S3 to perform the sewing of the section a.

In step S3, the second solenoid 57 is driven so that the feed dog 19 feeds the sewing material H by the feed pitch a of the section a. Next, in S4, it is determined whether or not it is operation timing. The operation timing is determined based on an operation timing signal that the operation timing generator 27 receives and outputs the reflected light from the operation timing reflector provided on the pulley 15, and determines the operation timing of the sewing needle 16. It measures timing. If it is not the operation timing (S4: NO), the process waits until the operation timing signal is output. On the other hand, if it is the operation timing (S4: YES), the process proceeds to S5, where the a-part swing width aw is set to R
The pulse motor 24 is read out from the AM 61 and driven by a predetermined amount to swing the sewing needle 16 by the swing width aw of the portion a.

Next, in S6, the number of stitches an in the a section is counted down. This is performed by rewriting the value of the number a of stitches a stored in the RAM 61. Next, S7
In, it is determined whether or not the counted number of stitches a of the section a has become zero. If the number a of stitches in section a is not 0 (S7: NO), it means that the sewing of section a has not been completed, and the processing of S4 to S7 is executed until the remaining stitches are formed. On the other hand, if the number of stitches an in the a section is 0 (S7: YES), this means that the sewing in the a section has been completed, and the process proceeds to S8 in order to form a stitch in the b section.

In S8, it is determined whether or not the number bn of stitches in section b is zero. The b-number of stitches bn refers to the number of vertical movements of the sewing needle 16 in the b-part, that is, the number of stitches formed in the b-part. Further, the number bn of stitches in section b is the feed pitch bp in section b.
Is set automatically while the sewing needle 16 returns to the first needle drop position (START) of the section a. If the number bn of stitches in section b is 0 (S8: YES), this means that sewing of section b has been completed, and the process proceeds to S16.

On the other hand, if the number of stitches bn is not 0 (S
8: NO), meaning that the sewing of the section b has not been completed, the process proceeds to S9, and the first solenoid 53 is turned on. First
When the solenoid 53 is driven, the plunger 53a, the connecting arm 54, the feed adjusting shaft 51, the connecting lever 52, the connecting rod 46
And the switch 41 interlocks to change the feed direction of the feed dog 19 in the opposite direction. Next, in S10, the feed dog 1
9 drives the second solenoid 57 so as to feed the workpiece H by the feed pitch bp of the b portion. Next, in S11, it is determined whether or not it is an operation timing. If it is not the operation timing (S11: NO), the process waits until the operation timing signal is output. On the other hand, if it is the operation timing (S11: YES), the process proceeds to S12, where the b-part swing width bw is read from the RAM 61 and the pulse motor 2 is read.
4 is driven by a predetermined amount to swing the sewing needle 16 by the swing width bw of the portion b.

Next, in S13, the number bn of stitches in section b is counted down. Next, in S14, it is determined whether or not the counted-down stitch number bn of section b is zero.
This is a process for determining whether or not the sewing of the section b has been completed. If the number bn of stitches in section b is not 0 (S14: N
O), the processes in S11 to S14 are executed until the number bn of stitches in section b becomes zero. On the other hand, if the number bn of stitches in section b has become 0 (S14: YES), the process proceeds to S15, and the first solenoid 53 is turned on so that the feed dog 19 feeds the sewing material H in the forward direction.
FF.

Next, at S16, c
The second part feed pitch cp is read out, and the second feed dog 19 feeds the workpiece H in the forward direction by the c part feed pitch cp.
The solenoid 57 is driven. Next, in S17, it is determined whether or not to finish the sewing. This determination is made based on a sewing signal output from the pedal sensor 9A when the operator steps on the pedal 9 again. When the sewing signal is detected (S17: YES), the process proceeds to S20 to perform the sewing processing at the end of sewing. On the other hand, when the stop sewing signal is not detected (S17: NO), the step S1 is performed to perform the lock stitching.
Proceed to 8.

In S18, it is determined whether or not it is operation timing. If it is not the operation timing (S18: NO), the process waits until the operation timing signal is output. On the other hand, if it is operation timing (S1
8: YES), and proceeds to S19, where the swing width cw of the portion c is stored in the RAM.
61, the pulse motor 24 is driven by a predetermined amount,
The sewing needle 16 is swung by the swing width cw of the portion c. Then, the process returns to S17.

Subsequently, the stop sewing process at the end of sewing (S20)
Will be described with reference to FIGS. 14 and 16. First, in S2001, it is determined whether the number d of stitches of the d section is 0, that is, whether the sewing of the d section has been completed. Here, the number d of stitches of the d portion means the number of times the sewing needle 16 moves up and down to form a stitch, and is automatically set when the d portion feed pitch dp is set.

When the number dn of stitches in the d section is 0 (S20)
01: YES), meaning that the sewing of the d section has been completed,
Proceed to step S2009. If the stitch number dn of the d section is not 0 (S2001: NO), it means that the sewing of the d section has not been completed, and S200 is formed to form a stitch at the d section.
Proceed to 2 to turn on the first solenoid 53. As a result, the direction of feed of the workpiece H is reversed. Next, S2
In 003, the second solenoid 57 is driven so that the feed dog 19 feeds the sewing material H by the d portion feed pitch dp. Next, in S2004, it is determined whether or not it is operation timing, that is, whether or not the operation timing device 27 outputs an operation timing signal. If it is not the operation timing (S2004: NO), the process waits until an operation timing signal is detected. On the other hand, if it is the operation timing (S2004: YES), the process proceeds to S2005, where the d part swing width dw is read from the RAM 61, the pulse motor 24 is driven by a predetermined amount, and the sewing needle 16 is moved to the d part swing width d.
Swing by w.

Next, in S2006, the number d of stitches of the d section is dn.
Count down. Next, in S2007, it is determined whether or not the counted number d of stitches dn of the d section is 0. That is, it is determined whether the sewing of the d portion has been completed. If the number d of stitches is not 0 (S2007: N
O), meaning that the sewing of the d part has not been completed, and the processes of S2004 to S2007 are executed until the stitch number dn of the d part becomes zero. On the other hand, if the number d of stitches of the d section is 0 (S2007: YES), this means that the sewing of the d section has been completed, the process proceeds to S2008, and the first solenoid 53 is turned off.
F. Thereby, the feed direction of the feed dog 19 becomes the forward direction.

Next, in S2009, the number of stitches in the e section en
Is zero, that is, whether or not the sewing of the portion e has been completed. In S2009, if the number dn of stitches in the e section is 0 (S2009: YES), this means that the sewing of the e section has been completed, and the execution of the sewing processing program is completed. Here, the number e of stitches in the e portion refers to the number of times the sewing needle 16 moves up and down in the e portion, that is, the number of stitches formed in the e portion. When the e-section feed pitch ep is set, the number e of stitches in the e-section is automatically set while the sewing needle 16 returns to the first needle drop position in the d section (the last needle drop position in the lockstitch c section). Is set.

On the other hand, if the number of stitches en in section e is not 0 (S2009: NO), it means that the sewing in section e has not been completed, and in order to form a stitch in section e, step S201 is performed.
The process proceeds to 0, the e-part feed pitch ep is read from the RAM 61, and the second solenoid 57 is driven so that the feed dog 19 feeds the sewing material H by the e-part feed pitch ep. Next, in S2011, it is determined whether it is operation timing. If it is not the operation timing (S2011: N
O) Wait until the operation timing signal is output. On the other hand, if it is the operation timing (S2011: YE
S), the process proceeds to S2012, where the swing width ew of the e part is set to the RAM
, The pulse motor 24 is driven by a predetermined amount, and the sewing needle 16 is swung by an e-part swing width ew.

Next, in S2013, the number of stitches in the e section en
Count down. Next, in S2014, it is determined whether or not the counted-down stylus number en is 0. If the number e of stitches is not 0 (S2014: N
O), meaning that the sewing of the e part is not completed, and the processing of S2011 to S2014 is executed until the number of stitches en of the e part becomes zero. If the number e of stitches is 0 (S20)
14: YES), meaning that the sewing of the e-section has been completed,
The processing of the sewing processing program is completed.

Here, a second specific example of each of the above-described processes will be described. 17 and 18 are views showing a second specific example of the lock stitch formed by the lock stitch device of the staggered sewing machine 1 of the present embodiment, and FIG. 17 shows the lock stitch at the start of sewing. FIG. 18 is a view showing the stop sewing at the end of sewing.

First, the operator sets the swing width w, the feed pitch p and the number of stitches n in the sections a to e. That is, for example, when the operator sets the a-part swing width aw or the like, the mode changeover switch 11d is switched to the first mode, and the scale of the forward feed pitch setting switch 11a is adjusted to "2" to set the a-part Input the feed pitch "2mm",
Further, the swing width “0 mm” of the portion a is input by the swing width setting switch 11c. Here, a section feed pitch “2 m
When "m" is input, the number of stitches a in section a is automatically set to "3". Then, when the operator presses the decision switch 11e, each set value is stored in the RAM 61. The operator similarly sets the swing width w, the feed pitch p, and the number of stitches n for the portions b, d, and e. Table 1 shows setting values in the second specific example. The part c is set based on a stitch table 61A corresponding to a stitch pattern selected by a stitch selection switch (not shown) by the operator. Also, c
The number of stitches cn is not set because the desired amount is formed by the operator adjusting the pedal 9.

[0066]

[Table 1]

When the operator sets the sewing object H on the sewing machine bed 3 and starts the zigzag sewing machine 1 by depressing the pedal 9, the first solenoid 53 is not driven, and
The second solenoid 57 is driven, and the feed dog 19 feeds the workpiece H in the forward direction by "2 mm" (S1 to S3). When the operation timing comes, the swing width “0 mm” of the portion a is read, the pulse motor 24 is driven by a predetermined amount, and the sewing needle 16 is rocked to a predetermined position to form a stitch (S4, S5). Then, the number of stitches of the “a” section “3” is counted down, and
It is determined whether or not n has become 0. At this point, the number of stitches in section a is "2" (S7: NO), so that S4-S
7 is executed. By the above processing, as shown in FIG. 17, three straight stitches with a feed pitch of “2 mm” are formed in the portion a.

When the number of stitches a in the section a becomes 0, that is, when three stitches are formed in the section a (S7: YES), it is confirmed that the number bn of stitches in section b is set to "12". The first solenoid 53 is turned on and the second solenoid 57 is driven so that the feed dog 19 feeds the sewing object H in the opposite direction by "0.5 mm" (S8 to S10). When the operation timing comes, the swing width “10 mm” of the portion b is read out, the pulse motor 24 is driven by a predetermined amount, and the sewing needle 16 is swung to a predetermined position to form a stitch (S11, S12). Then, the number bn of stitches in section b is counted down, and the number bn of stitches in section b is counted down.
Is determined to be 0 (S13, S14). At this point, the number d of stitches in the d section is “11”,
-S14 are executed. By the above processing, FIG.
As shown in FIG. 12, 12 staggered stitches having a feed pitch of “0.5 mm” and a swing width of “10 mm” are formed in the portion b.

When the number dn of stitches in section b becomes 0, ie, b
When 12 staggered stitches are formed in the portion, the first solenoid 53 is turned off and the second solenoid 57 is driven so that the feed dog 19 feeds the sewing object H in the forward direction by "2 mm" (S14: YES). , S15, S16). Then, when the operator steps on the pedal 9, the desired amount of lock stitches including the staggered stitches including the portion c is formed (S17: NO,
S18, S19).

On the other hand, when the operator steps on the pedal 9 again, a sewing signal is detected from the pedal sensor 9A, and the sewing processing at the end of sewing is executed (S17: YES, S2).
0). That is, as shown in FIG. 14 and FIG.
After the solenoid 53 is turned off and it is confirmed that the sewing of the d section is not completed, the first solenoid 53 is set so that the feed dog 19 feeds the workpiece H in the opposite direction by "0.5 mm".
Then, the second solenoid 57 is driven by a predetermined amount (S2001).
~ S2003). When the operation timing signal is detected, R
The swing width “10 mm” is read from the AM 61 and the pulse motor 24 is driven to swing the sewing needle 16 to a predetermined position to form a stitch (S2004, S2005). Then, the number d of stitches of the d section is counted down, and it is determined whether or not the number dn of stitches of the d section has become 0 (S2006, S200).
7). At this point, the number d of stitches in the d section is “11”,
The processes of S2004 to S2007 are executed until the number d of stitches of the d section becomes zero. By the above processing, as shown in FIG. 18, the feed pitch “0.5 mm” and the swing width “10 m”
Twelve staggered stitches of “m” are formed.

When twelve staggered stitches are formed in the portion d, the first solenoid 53 is turned off so that the feed dog 19 feeds the workpiece H in the forward direction (S2007: YES, S200).
8). Then, the number of stitches "3" is read out and the feed dog 19 is read.
So that the workpiece H is forwarded by 2 mm in the forward direction.
The solenoid 57 is driven by a predetermined amount (S2009: YE
S, S2010). When the operation timing comes, the swing width “0 mm” of the portion e is read out, the pulse motor 24 is driven by a predetermined amount, and the sewing needle 16 is rocked to a predetermined position to form a stitch (S2011, S2012). Then, the number e of stitches in the e section is counted down, and it is determined whether the number en of stitches in the e section has become 0 (S2013, S2014). At this point, the number e of stitches of the e section is “2”, and thus the number of stitches of the e section en
Until the value becomes 0, the processing of S2011 to S2014 is executed. As a result, as shown in FIG. 18, three straight stitches having a feed pitch of “2 mm” can be formed in the portion e.
When a predetermined number of stitches are formed in the portion e as described above, the sewing is completed.

As described above, according to the zigzag stitch sewing machine 1 of the present embodiment, the advance portions (a and e) of the lock stitch.
The feed pitch p, the swing width w and the number of stitches n can be changed between and the retreating parts (parts b and d). For this reason, as in the first specific example, the staggered stitches of the portion a and the straight stitches of the portion b and the staggered stitches of the portion d and the staggered stitches of the portion e are formed so as to intersect so as to be pressed. Becomes possible. Also, as in the second specific example, the sewing start (START) and the sewing end (END)
Can be formed by straight stitching. As a result, it is possible to form a lock stitch that is difficult to remove a thread.

Further, the lock stitching advance portion (a portion, e portion) and the lock stitch retreat portion (b portion, d portion) can be formed with different feed pitches p and different numbers of stitches n. Therefore, as shown in the second specific example, the swing width w of the zigzag stitch formed in the lock stitch can be formed to be larger than the swing width cw of the lock stitch. As a result, the seams were densely formed at the beginning and end of the main sewing, and the start and end of the sewing could be reinforced.

The forward feed pitch setting switch 11
When the feed pitch p is set by a and the reverse feed pitch setting switch 11b, the last needle drop position of the later-formed stitch seam (portion b, portion e) is changed to the pre-adhesive stitching advance portion ( The number of stitches n is set so as to return to the first needle drop position of the section a and the section d). For this reason, the operator adjusts the feed pitch p and the number of stitches n so that the operator can form the lock stitch advance portion (a portion, e portion) and the lock stitch retreat portion (b portion, d portion) in the same area. There is no need to set it.
As a result, the set time of the feed pitch p and the number of stitches n can be shortened, and a good-looking stop sewing can be formed.

When the operator sets the swing width w and the feed pitch p of the sections a to e and starts the sewing machine, the CP
U63 controls the sewing processing program, and the stop sewing is automatically formed at the beginning and end of the main sewing. For this reason,
The operator does not need to give a trigger for reverse rotation, for example, by depressing the pedal 9 or operating the feed reversing lever. As a result, the burden on the operator can be reduced, and work efficiency can be improved.

The feed pitch p and the swing width w can be arbitrarily changed by the forward feed pitch setting switch 11a, the reverse feed pitch setting switch 11b, and the swing width setting switch 11c. For this reason, it is possible to set the feed pitch p and the swing width w according to the material and use of the sewing object H, and it is possible to form a good stitch in a stitched state.

(Second Embodiment) Next, a description will be given of a second embodiment of a stitching apparatus for a staggered sewing machine according to the present invention. FIG. 19 is a block diagram illustrating a main configuration of a control box 80 according to the zigzag sewing machine according to the second embodiment. The stitching device of the zigzag sewing machine according to the present embodiment is shown in FIG.
As shown in FIG. 9, the control box 80 includes a stitch number setting switch 11f in addition to the forward feed pitch setting switch 11a and the reverse feed pitch setting switch 11b of the staggered sewing machine 1 of the first embodiment. I have.

The operator operates the mode switch 11d.
And the swing width w is inputted by the swing width setting switch 11c, and the feed pitch p is inputted by adjusting the forward feed pitch setting switch 11a or the reverse feed pitch setting switch 11b. Further, the operator inputs an arbitrary number of stitches with the stitch number setting switch 11f and presses the confirmation switch 11e. As a result, data including the desired number of stitches n is stored in the RAM 61. For this reason, even if the number of stitches n is automatically set by the forward feed pitch setting switch 11a or the reverse feed pitch setting switch 11b, the operator appropriately increases or decreases the number of stitches in accordance with the material and use of the sewing material H. can do. As a result, when the number of stitches is reduced by the operator, it is possible to avoid waste of work by avoiding extra stitches, thereby improving work efficiency. On the other hand, when the operator increases the number of stitches, the end of the lockstitch can be reinforced more firmly.

It is needless to say that the present invention is not limited to the above-described embodiment at all, and can be appropriately changed without departing from the spirit of the invention. For example, in each of the embodiments described above, the N-stop is described. For example, by setting the feed pitch p of the forward-stitching advance portion (a portion) at the start of sewing and the forward-stitching advancement portion (e portion) at the end of sewing. , V stop. Also, for example, the V-stop can be performed by setting the number of stitches to “0” using a stitch number setting switch. Further, for example, in the above embodiments, the switches such as the forward-direction pitch setting switch 11a and the reverse-direction pitch setting switch 11b are formed by volume-type knobs, but may be set by a touch panel or a keyboard. it can. In each of the above embodiments,
Although switches such as a forward feed pitch setting switch 11a are provided in the control box 8, the pillar 4 of the staggered sewing machine 1 is provided.
Or on the arm 5 or the like. Also, for example,
In the above embodiments, the swing width w and the like of the lockstitch are set based on the stitch table 61A, but may be set by the swing width setting switch 11c and the like.

[0080]

According to the first aspect of the present invention,
The stitches formed before and after the reversal of the feed of the fixing stitch are pressed against each other, and an effect that the thread can be prevented from coming off can be exhibited.

According to the second aspect of the present invention, in addition to the effect of the first aspect, since the stitches of the lock stitch are formed densely, the start and end portions of the zigzag stitch of the lockstitch are formed. The effect is that the suture can be reinforced.

According to the configuration of the third aspect of the invention, in addition to the effect of the second aspect, it is possible to shorten the set time of the feed pitch and the like, and to improve the working efficiency. Demonstrate.

According to the structure of the invention described in claim 4, in addition to the effect of any one of claims 1 to 3, an effect of being able to form a good laced stitch in a sewn state is exhibited. .

Further, according to the structure of the invention described in claim 5, in addition to the effect of any one of claims 1 to 4, an effect of forming a good stitch in a sewn state is exhibited. .

Further, according to the configuration of the invention described in claim 6, the stitch of the forward stitching portion and the stitch of the backward stitching portion are pressed against each other, so that the effect of preventing the thread from coming off can be exhibited. .

According to the structure of the invention described in claim 7, in addition to the effect of claim 6, an effect that the stitches at the start and end of the lockstitch can be reinforced can be exhibited.

According to the structure of the invention described in claim 8, in addition to the effect of claim 7, it is possible to shorten the set time of the feed pitch and the like, and to improve the working efficiency. Demonstrate.

According to the configuration of the ninth aspect of the present invention, in addition to the effect of any one of the sixth to eighth aspects, an effect of being able to form a good sewn stitch in a sewn state is exhibited. .

Further, according to the structure of the invention described in claim 10, in addition to the effect described in any one of claims 6 to 9, an effect of forming a good laced stitch in a sewn state can be obtained. Demonstrate.

According to the structure of the invention described in claim 11, in addition to the effect described in any one of claims 6 to 10, it is possible to form an appropriate fixing seam according to the purpose. Thus, it is possible to improve the working efficiency without wasting work.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a staggered sewing machine according to a first embodiment.

FIG. 2 is a perspective view showing a main part of a swing mechanism of the staggered sewing machine.

FIG. 3 is a perspective view showing a main part of a horizontal feed mechanism of the staggered sewing machine.

FIG. 4 is a diagram showing the switch in a state where the feed is zero.

FIG. 5 is a diagram showing the switch in a state where the feed is in the forward direction.

FIG. 6 is a diagram showing the switch in a state where the feed is in the reverse direction.

FIG. 7 is a view showing the feed pitch variable mechanism in a state where the feed is in the forward direction.

FIG. 8 is a view showing a feed pitch variable mechanism in a state where the feed is in the reverse direction.

FIG. 9 is a block diagram showing a main configuration of the control box.

FIG. 10 is also a diagram showing a forward feed pitch setting switch.

FIG. 11 is a diagram showing a reverse feed pitch setting switch.

FIG. 12 is a view showing a zigzag stitch formed by the zigzag sewing machine.

FIG. 13 is a flowchart showing the contents of a sewing processing program.

FIG. 14 is a sub flowchart of FIG.

FIG. 15 is a view showing a first specific example of the lock stitch formed by the lock stitch device of the staggered sewing machine, which illustrates the lock stitch at the start of sewing.

FIG. 16 is a view showing a first specific example of the lock stitch formed by the stitch sewing device of the staggered sewing machine, which illustrates the lock stitch at the end of the sewing.

FIG. 17 is a view showing a second specific example of the lock stitch formed by the lock stitch device of the staggered sewing machine, which illustrates the lock stitch at the start of sewing.

FIG. 18 is a view showing a second specific example of the lock stitch formed by the lock stitch device of the staggered sewing machine, which illustrates the lock stitch at the end of the sewing.

FIG. 19 is a block diagram showing a main configuration of a control box according to the second embodiment.

FIG. 20 is a diagram showing a V-stop at the start of sewing in straight stitching.

FIG. 21 is a diagram showing a V-stop at the end of sewing in straight-line sewing.

FIG. 22 is a diagram showing N-stop at the start of sewing in straight stitching.

FIG. 23 is a diagram showing N-stop at the end of sewing in straight-line sewing.

FIG. 24 is a diagram illustrating N-stopping by a conventional staggered sewing machine.

[Explanation of symbols]

 1 staggered sewing machine 11a forward feed pitch setting switch 11b reverse feed pitch setting switch 11c swing width setting switch 11f stitch number setting switch 16 sewing needle 61 RAM 62 ROM 63 CPU w swing width p feed pitch n number of stitches H Sewing goods

Claims (11)

[Claims] 1. A staggered stitch is formed on a sewing object by giving a feed to a sewing object at a predetermined pitch in a predetermined direction and swinging a sewing needle at a predetermined staggered width in a direction intersecting the feeding direction. A stitching device for a zigzag stitch sewing machine that is used in a zigzag sewing machine that forms stitches on the sewing object, and reverses a feed direction applied to the sewing object at the time of the stitching. And a stitching control means for controlling the staggered sewing machine to change the swing width of the sewing needle before and after the reverse rotation. 2. The sewing machine according to claim 1, further comprising a feed pitch control unit that controls the staggered sewing machine to change a feed pitch of the workpiece before and after the feed direction is reversed at the time of the stop sewing. The stitching device for a zigzag sewing machine according to claim 1. 3. A stitch number control means for controlling the number of stitches forming a stitch before and after the feed pitch is changed by the feed pitch control means. A stitching device for a staggered sewing machine. 4. A swing width setting means for arbitrarily setting a swing width of the sewing needle in the stop stitching. A stitching device for a staggered sewing machine. 5. The apparatus according to claim 1, further comprising a feed pitch setting means for arbitrarily setting a feed pitch of the sewn article in the stop sewing. A stitching device for a staggered sewing machine. 6. A sewing machine is provided with a feed at a predetermined pitch in the forward direction and a sewing needle is swung at a predetermined staggered width in a direction intersecting with the feed direction, thereby forming a series of multiple feeds on the work. A staggered sewing machine used for a zigzag stitch sewing machine forming staggered stitches, wherein at least one of a start end and an end of the series of staggered stitches performs a stop stitch on the workpiece. In order to change the swinging width of the sewing needle in a forward portion before the reverse rotation and a retreating portion after the reverse rotation while reversing the direction of the feed applied on the workpiece in the middle of the stop sewing, A stitching device for a staggered sewing machine, comprising a stitching control means for controlling the staggered sewing machine. 7. A feed pitch control means for controlling the staggered sewing machine in order to individually change a feed pitch of the workpiece in a forward portion and a reverse portion of the lock stitch. A stitching device for a staggered sewing machine according to claim 6. 8. A stitch number control means for controlling the number of stitches forming a stitch at an advance portion and a retreat portion of the lock stitch where the feed pitch is changed by the feed pitch control means. The stitching device for a zigzag stitch sewing machine according to claim 7. 9. A swing width setting means for arbitrarily setting a swing width of the sewing needle at a forward portion and a backward portion of the lock stitch separately from the predetermined staggered width. A stitching device for a staggered sewing machine according to any one of claims 6 to 8. 10. A feed pitch setting means for arbitrarily setting a feed pitch of the sewn material in a forward portion and a retreat portion of the lock stitch separately from the staggered stitch. A stitching device for a staggered sewing machine according to any one of claims 6 to 9. 11. The staggered sewing according to claim 6, further comprising stitch number setting means for individually setting the number of stitches in a forward portion and a backward portion of the lock stitch. Sewing device for sewing machine.