JPH0234629B2 - MISHIN - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a sewing machine such as a buttonhole sewing machine that automatically performs cycle sewing such as buttonhole sewing on a workpiece cloth at predetermined intervals. be.

(Prior Art and Problems to be Solved by the Invention) Conventionally, for example, while a part of the work cloth is held by the action of a presser foot, feeding is applied to the work cloth,
In a sewing machine that executes one sewing cycle of cycle sewing such as buttonholing by moving the needle up and down in synchronization with the feed operation, the workpiece cloth is transferred to the cycle sewing machine after the cycle sewing for one sewing cycle is completed. When performing relative intermittent movement and performing the next cycle sewing at the moved position, the workpiece cloth is slackened in the vicinity of the presser foot prior to the start of cycle sewing, and the workpiece cloth is not adjusted when the next cycle sewing is executed. I haven't found anything that allows for smooth feeding.

(Object of the Invention) The present invention has been made in view of the above circumstances, and its purpose is to intermittently move the workpiece cloth relative to the cycle sewing machine after completing cycle sewing for one sewing cycle, and When executing the next cycle sewing at the moving position, the work cloth can be fed smoothly during cycle sewing by creating slack in the work cloth near the presser foot before starting the cycle sewing. Our goal is to provide sewing machines.

(Problems to be Solved by the Invention) In order to achieve the above object, the present invention includes a seam forming means that includes a needle that can move up and down and forms a seam in a work cloth, and a part of the work cloth. and a work cloth feeding means for feeding the work cloth while holding the work cloth based on the action of the presser foot, and both means are operated synchronously. A cycle sewing machine capable of forming cycle stitches, a mounting table, and a pair of cloth clamps for clamping a workpiece cloth between the mounting table,
a work cloth support means disposed to be intermittently movable relative to the cycle sewing machine; a setting means for setting the number of cycle stitches to be executed and an interval between each cycle stitch execution position; When sewing based on the execution number data and interval data, the presser foot is adjusted by moving at least one of the cloth clamps on the mounting table while the presser foot and the pair of cloth clamps are activated, prior to the start of each cycle of sewing. and control means for controlling the operation of the work cloth support means so as to form slack in the work cloth between the foot and the foot.

(Function) Therefore, when sewing is performed based on the execution number data and interval data set by the setting means, before starting each cycle of sewing, the control means controls the workpiece cloth supporting means and moves at least one cloth clamp on the mounting table to form a slack in the workpiece cloth between it and the presser foot. This slack allows the work cloth to be fed smoothly during cycle sewing.

(Example) Hereinafter, an example in which the present invention is embodied in an industrial buttonhole sewing machine will be described with reference to FIGS. 1 to 3. As shown in Figure 1, on the top of the table 1 is a cycle sewing machine 2 that can sew buttonholes.
is placed. A needle bar 4 having a needle 3 at its lower end is movably and swingably supported on the arm portion 2a of the cycle sewing machine 2, and is moved up and down in conjunction with a main shaft (not shown) and in a direction perpendicular to the cloth feeding direction. is swayed by. Bed section 2 of the sewing machine 2
A feed stand (not shown) is supported on the upper surface of b so as to be movable in the cloth feeding direction, and a presser foot 5 is supported on the feed stand so as to be movable up and down. This presser foot 5
is operatively connected to an air cylinder (not shown), and is moved up and down based on the action of a solenoid valve 6 for operating the air cylinder.

Then, when the presser foot 5 is moved down and the main shaft is rotated with the work cloth C being held between the presser foot 5 and the feed base, the feed base and presser foot are moved through a predetermined feed cam mechanism. The legs 5 are moved back and forth as a unit,
Feed is applied to the work cloth C. Further, the needle 3 is moved up and down and swung, and a buttonhole stitch is formed on the work cloth C by the cooperation of the needle 3 and a thread loop catcher (not shown). A drive pulley 7 is provided at the end of the main shaft and is located on the outer surface of the arm portion 2a, and can be connected to a drive source (not shown) via a predetermined clutch mechanism including a clutch lever 8. This clutch lever 8
is connected to an air cylinder 9 supported on the table 1, and is configured to be rotated to two predetermined positions in response to the action of an electromagnetic valve 10 for operating the air cylinder 9.

Then, when the air cylinder 9 is operated, the first
As shown in the figure, when the clutch lever 8 is placed in a position away from the micro switch 11 for detecting the stoppage of the sewing machine and the drive pulley 7, the micro switch 11 is held in the OFF state and the drive source is turned off. Power is transmitted to the drive pulley 7. Further, after the air cylinder 9 is activated, the clutch lever 8 is held at the separated position by a predetermined linking means (not shown) while one sewing cycle of buttonhole stitching is performed.
Thereafter, the clutch lever 8 is engaged with the drive pulley 7 via a predetermined cam mechanism (not shown), and the connection between the main shaft and the drive source is interrupted. At this time, the microswitch 11 is kept in the ON state.

A guide rod 12 is installed between the left and right ends of the upper surface of the table 1, and a workpiece cloth mounting table 13 having a long hole (not shown) in the center of the guide rod 12 moves in the left-right direction in FIG. Possibly supported. A pair of guide rollers 14 and a pulse motor 15 are disposed on the table 1 below the mounting table 13, and a drive belt 16 is hung around the roller 15a on the motor shaft of the pulse motor 15 and the guide roller 14. There is. This drive belt 16 is connected to the mounting table 1 by a connecting piece 17.
3, and when the pulse motor 15 is intermittently rotated, the mounting table 13 is intermittently moved in the left-right direction via the drive belt 16 and the connecting piece 17. Further, during this movement, a relative movement occurs between the feed table and the presser foot 5 arranged in the elongated hole and the mounting table 13.

A pair of cloth clamps 18 and 19 are disposed above the mounting table 13 near both ends thereof so as to be movable together with the mounting table 13, and air cylinders 18a and 1
It is designed to be moved up and down by 9a. In addition, the right cloth clamp 19 is connected to another air cylinder 1.
9b, it is adapted to be moved in the left and right direction. When the air cylinders 18a and 19a are operated based on the action of the electromagnetic valve 20 shown in FIG. is fixed on the mounting table 13, so that the work cloth C can be held in close contact with the mounting table 13. In this state, the air cylinder 19 is activated based on the action of the electromagnetic valve 21 shown in FIG.
When b is activated, the right cloth clamp 19 is moved to the left in FIG. 1, and the clamped portion of the workpiece cloth C, which is clamped between the feed table and the presser foot 5, moves during buttonhole sewing. Presser foot 5
The work cloth C is made to have slack in the vicinity of. A workpiece cloth supporting means is constituted by the above-mentioned mounting table 13, cloth clamps 18, 19, and the like.

Further, as shown in FIGS. 1 and 2, a pedal 22a connected to a start switch 22 for turning on power to the sewing machine 2 is provided below the table 1, and a pedal 22a connected to a start switch 22 for turning on power to the sewing machine 2 is provided. There is a thread breakage detection switch 2 on the needle thread guide path.
3 is provided. Furthermore, a buttonhole number setting device and a distance setting device between buttonholes (both not shown) are provided in the operation box 24 installed upright on the table 1, and the detection switch 23 is also installed when thread breakage is detected. A light emitting indicating device 25 is provided which is activated by the. The operation box 24 is provided with a selection switch 26 for selecting an overlap stitch mode M1 for repeatedly performing sewing on the same section and a skip stitch mode M2 for proceeding to the next sewing cycle.
And each of the switches 11, 22, 23, 26
is connected to an input terminal of the control circuit 27, and each electromagnetic valve 6, 10, 20, 21 is connected to an output terminal of the control circuit 27. In addition, the pulse motor 15
is connected to the output terminal of the control circuit 27 via the drive circuit 28.

Next, the operation of the automatic sewing machine constructed as described above will be explained with reference to FIG. Now, when buttonhole stitching is to be performed continuously at predetermined intervals, after setting the distance between adjacent buttonholes, convert it to the number of pulses, and calculate the number of pulses between each buttonhole stitch position. B in the control circuit 27 as interval data.
Store in register. Next, the number of buttonholes, that is, the number of overlock stitches to be executed, is set, and the control circuit 27
The data is stored in the A register within. After that, the mounting table 13
After placing the work cloth C on top and arranging its right end between the feed table and the presser foot 5, the sewing machine 2 is powered on by depressing the foot pedal 22a linked to the start switch 22. And cloth clamp 1
The solenoid valves 20 for the cloth clamps 18 and 19 are activated, and the air cylinders 18a and 19a operate the cloth clamps 18 and 19 respectively.
19 is moved down. Therefore, both cloth clamps 18,
Both ends of the workpiece cloth C are fixed onto the mounting table 13 by means 19 .

Next, the electromagnetic valve 6 is operated, and the presser foot 5 is moved down via an air cylinder (not shown), so that the vicinity of the right end of the workpiece cloth C is held between the presser foot 5 and the feed table. Thereafter, the electromagnetic valve 21 is activated, and the right cloth clamp 19 is moved slightly to the left in FIG. . Subsequently, the electromagnetic valve 10 is actuated, and the clutch lever 8 is rotated to the position shown in FIG. 1 via the air cylinder 9, and held at that position by a predetermined linking means. Therefore, the microswitch 11 is held in the OFF state, and the main shaft is connected to the drive source and rotated. Along with this rotation of the main shaft, an overlock stitch is formed by the cooperation of the needle 3 and the thread ring catcher, and the workpiece cloth, which is held between the feed table and the presser foot 5 via a predetermined feed cam mechanism, is Feed is applied to C, and one sewing cycle of buttonhole sewing is completed. At this time, since a slack is formed in the vicinity of the presser foot 5 of the work cloth C, the feeding operation can be performed smoothly. Then, the clutch lever 8 is engaged with the drive pulley 7 via a predetermined cam mechanism, the micro switch 11 is held in the ON state, and the rotation of the main shaft is stopped. In order to ensure that the rotation of the main shaft can start, the electromagnetic valve 10 is kept in an operating state for a predetermined period of time by a timer, and then its operation is stopped.

And the electromagnetic valve 2 for the air cylinder 19b
1 is stopped, when it is confirmed by the thread breakage detection switch 23 that no thread breakage occurred during one sewing cycle, that is, when the thread breakage detection switch 23 is not activated. In this case, the operation of the electromagnetic valve 6 for the presser foot 5 is stopped, and the presser foot 5 is moved upward. Thereafter, it is determined whether the number of holes stored in the A register has become zero, that is, whether all buttonholes have been overlocked, and if the number of holes is not zero, the pulse motor 15 is driven. Then, the number of pulses stored in the B register is subtracted. It is determined whether the number of pulses is zero, that is, whether the work cloth C has been moved by the distance between adjacent buttonholes, and the number of pulses is subtracted until it becomes zero. Then, according to the number of pulses, the pulse motor 15
As a result, the workpiece cloth C is moved by a predetermined amount to the right in FIG. 1 together with the mounting table 13 via the guide roller 14, drive belt 16, and the like. Therefore, the buttonhole part of the work cloth C to be sewn next is placed on the feed table, and the number of holes is subtracted.

Then, as shown by the connector P2 in FIG. 3, the cloth clamps 18, 19, the presser foot 5, and the clutch lever 8 are operated again, and the next buttonhole is sewn. In this way, a plurality of buttonhole sewing cycles can be repeated at predetermined intervals until the number of holes stored in the A register becomes zero, and when the number of holes becomes zero, the third A new work cloth C can be set as shown by connector P1 in the figure.

Furthermore, when the thread breakage detection switch 23 confirms that the needle thread has broken during one sewing cycle, the switch 23 activates the light emitting indicator 25 to indicate that trouble has occurred. In this case, the rotation of the spindle is immediately stopped. After the needle thread is placed on the proper guide path, when the start switch 22 is activated, the operation of the light emitting instruction device 25 is stopped. After that, if the overlapping stitching mode M1 is selected by the selection switch 26, as shown by the connector P2 in FIG.
Sewing can be performed again in the same buttonhole area.

On the other hand, if skip stitch mode M2 is selected by the selection switch 26, the pulse motor 15 is driven, and the workpiece cloth C is intermittently moved to the right in FIG. will be moved. As for the incomplete buttonhole stitching portion caused by the thread breakage, after a series of buttonhole stitching for one piece of work cloth C is completed, the thread can be unraveled and sewn again. Therefore, for relatively low-grade clothing that is allowed to be sewn again in the same hole, overlapping stitching can be performed, and for high-quality clothing that does not allow overlapping sewing, the following You can now proceed to the sewing cycle.

Furthermore, in this embodiment, a slack is formed in the workpiece cloth C near the presser foot 5 prior to the start of one sewing cycle, so that the workpiece cloth can be fed extremely smoothly during cycle sewing. .

Note that the present invention is not limited to the above-mentioned embodiments, and the configuration of each part can be arbitrarily changed without departing from the spirit of the present invention.

(Effects of the Invention) As described in detail above, the present invention moves the workpiece cloth intermittently relative to the cycle sewing machine after completing cycle sewing for one sewing cycle, and executes the next cycle sewing at the moved position. In this case, prior to the start of the cycle sewing, slack is created in the work cloth in the vicinity of the presser foot, so that the work cloth can be smoothly fed during the cycle sewing, which is an excellent effect.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of the present invention in a buttonhole sewing machine, FIG. 2 is a diagram showing the electrical configuration of the sewing machine, and FIG. 3 is a flowchart. In the figure, 2 is a cycle sewing machine, 3 is a needle, and 5 is a cycle sewing machine.
13 is a presser foot, 13 is a mounting table, 18 and 19 are cloth clamps, 27 is a control circuit constituting a setting means and a control means, and C is a workpiece cloth.

Claims (1)

[Scope of Claims] 1. A stitch forming means that includes a needle 3 that can move up and down and forms a stitch on the work cloth C, and a presser foot 5 that includes a presser foot 5 for holding a part of the work cloth C. A cycle sewing machine 2 is equipped with a work cloth feeding means for feeding the work cloth C while holding the work cloth C based on the action of the above, and is capable of forming cycle stitches by operating both means in synchronization. and a pair of cloth clamps 18 and 19 for clamping the work cloth C between the mounting table 13 and the mounting table 13.
a work cloth support means disposed to be intermittently movable relative to the cycle sewing machine 2; a setting means 27 for setting the number of cycle stitches to be executed and the interval between each cycle stitch execution position; and the setting means. During sewing based on the execution number data and interval data set by 27, prior to the start of each cycle sewing, at least one of the fabrics is It is characterized by comprising a control means 27 for controlling the operation of the work cloth support means so as to form a slack in the work cloth C between the clamp 19 and the presser foot 5 by moving the clamp 19 on the mounting table 13. sewing machine.