JPH10337391A - Sewing machine capable of stopping at bottom position - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable to realize corner sewing without generating a blank at a corner part, by setting the rotation angle of cloth by a corner sewing cloth rotation angle setting key in corner sewing by zigzag sewing and making a bottom position stopping point at a proper point on right or left side corresponding to the cloth rotation direction. SOLUTION: On corner sewing by zigzag sewing, rotation direction of corner sewing and cloth are preliminarily set by a cloth rotation angle setting key 4. During zigzag sewing operation of a sewing machine, when a bottom stopping key 3 is operated, the needle position is judged to be right or left by a signal from a needle oscillation detecting sensor 20, and whether the same matches the setting of the setting key 4 or not is judged. The judgement is executed by every one stitch step, and, if it does not match, same judgement is carried out after execution of one stitch. If matches, lower dead point stopping is carried out at the next needle position. A user raise the cloth presser, rotates the cloth, and lowers the cloth presser down again, then zigzag sewing is started again.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a sewing machine capable of stopping at a lower position.

[0002]

2. Description of the Related Art When performing square sewing by zigzag sewing,
When sewing is advanced to the corner, the sewing machine is stopped once with the needle stuck in the cloth, the cloth holder is raised, the cloth is rotated by a predetermined angle, and the cloth holder is lowered again to perform sewing. . In order to realize such a corner stitch, a sewing machine which can stop the sewing machine at a lower position such as a bottom dead center of the sewing machine is commercially available.

[0003]

FIG. 5 shows an example in which the following zigzag sewing is executed, the cloth N is rotated counterclockwise by 90 °, and then the next zigzag sewing is executed. In this case, if the lower stop operation is performed at the time indicated by the arrow, the sewing machine stops at the needle entry point on the left side in the figure, and the next sewing is performed with this point as the base point KL. In this case, there is a problem that a blank portion where no seam exists at the corner of the cloth N occurs. An object of the present invention is to remedy the above-mentioned disadvantages of the prior art.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides means for providing zigzag sewing data in a sewing machine capable of zigzag sewing and stopping a needle at a lower position. Means for instructing which side in the zigzag direction of the zigzag sewing the needle to stop at the lower position, means for instructing to stop the needle at the lower position, and instructions by the means for instructing Correspondingly, there is provided a means for stopping the needle at the lower position on the side indicated by the instruction means.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, a CPU 100 controls the entire sewing machine in accordance with a program stored in a program storage device 101, controls a sewing machine motor drive circuit 110, drives a sewing machine motor 111, and
To execute the sewing. The sewing machine is provided with an S / S key 1 for instructing start / stop, and a speed controller 2 for designating the speed of the sewing machine motor 111. Sewing is performed in accordance with a user's command and designation.

The vertical position of the needle in the stitch forming mechanism 112 can be detected by the upper shaft rotation phase detection sensor 114. It is possible to stop at the dead center. Further, in this embodiment, a needle run-out detection sensor 20 is provided so that a horizontal run-out of the needle at the time of zigzag sewing or the like can be detected. Further, a cloth press operation detection sensor 21 is provided to detect raising and lowering of the cloth press.

The stitch data storage device 10 stores stitch data corresponding to various stitch patterns such as zigzag stitches. When the pattern selection key 5 is operated, the stitch patterns are displayed via the display control device 102. An arbitrary pattern is displayed on the display device 103 and can be selected. Reference numeral 11 denotes a temporary storage device.

The CPU 100 is further connected with a lower stop key 3 and a square sewing cloth rotation direction setting key 4, and the user sets a rotation direction of the cloth at the time of square sewing by operating the square sewing cloth rotation direction setting key 4. Further, the needle can be stopped at the bottom dead center position by operating the lower stop key 3. The square sewing cloth rotation direction setting key 4 is used to set which side in the zigzag direction, that is, the left stitch or the right stitch of the zigzag seen by the user toward the sewing machine, to stop the needle downward. is there. Therefore, it may be configured to directly specify the right side or the left side instead of the cloth rotation direction, and any other direct or indirect setting sets the right side or the left side. Anything can be used. When a stop command is issued by the lower stop key 3 to the lower stop control program storage device 12, the stop position is set to the left side of the zigzag by the setting of the rotation direction by the square sewing cloth rotation direction setting key 4 and the signal from the needle deflection detection sensor 20. Alternatively, a program for stopping on the right side is stored, and the CPU 100 controls the sewing machine motor drive circuit 110 based on a command from the upper shaft rotation phase detection sensor 114 to stop the needle at the right or left position to stop at the bottom dead center. It is made to let.

Now, as shown in FIG. 4, the cloth N is rotated in a counterclockwise direction.
It is assumed that the setting has been made. When the lower stop key 3 is operated at the time indicated by the arrow, the CPU 100 follows the program in the lower stop control program storage device 12 to perform the setting by operating the square sewing cloth rotation direction setting key 4. Correspondingly, it is determined to stop at the needle drop point on the right side in the drawing, that is, on the right side when viewed from the posture in which the user is performing the sewing machine operation, and the point (K−1) is determined based on the signal from the needle vibration detection sensor 20. Then, the needle is stopped at the bottom dead center of the next needle drop point without stopping, and this point is set as a base point KR. If the setting of the square sewing cloth rotation direction setting key 4 is clockwise, the point (K-
The sewing machine stops at 1) and executes the next sewing with this point as a base point.

The user raises the cloth presser, rotates the cloth N counterclockwise by 90 ° with the needle stuck at the base point KR, lowers the cloth presser again, presses the S / S key 1, and resumes sewing. The sewing shown in FIG. 4 is executed. The sewing can be resumed based on the cloth presser lifting / lowering detection signal from the cloth presser operation detection sensor 21.

The setting of the rotation direction by the square sewing cloth rotation direction setting key 4 may be performed before the square sewing is performed, or may be set after the lower position is once stopped. When the setting is performed by the square sewing cloth rotation direction setting key 4 after the lower position is stopped, if the left and right of the stop position match the setting, the setting is left as it is, otherwise, 1 is set.
The stitching is advanced, and the lower position is stopped again.

FIG. 2 shows a square sewing cloth rotating direction setting key 4 at first.
4 shows a flowchart in the case of performing the setting according to. First, the square sewing and the rotation direction of the cloth are set by the square sewing cloth rotation direction setting key 4 (step S1), the sewing machine is operated to perform zigzag sewing (step S2), and the lower stop key 3 is operated. (Step S3), the left and right of the next needle position is determined based on the signal from the needle runout detection sensor 20, and it is determined whether or not this matches the setting of the square sewing cloth rotation direction setting key 4 (Step S4). This determination is made for each first step, and if they do not match, the same determination is made after the first stitch has been advanced. If they match, the bottom dead center is stopped at the next needle position (step S5). Then, the user raises the cloth presser, rotates the cloth N, lowers the cloth presser again, and
When a restart command is issued by the / S key 1 (step S6), zigzag sewing is restarted from the point where the bottom dead center stops (step S7).

[0013] According to FIG.
A flowchart will be described in which the setting is performed after the lower position stops. The sewing machine operation is performed, zigzag sewing is performed (step S10), and when the key operation of the lower stop key 3 is performed (step S11), the lower dead center stops at the next needle position (step S12). Then, when the rotation direction of the cloth is set by the square sewing cloth rotation direction setting key 4 (step S1).
3) Based on the information from the needle runout detection sensor 20, it is determined whether the current needle position is on the left or right side, and it is determined whether or not this matches the setting of the square sewing cloth rotation direction setting key 4 (step S14). ). If they do not match, the first stitch is advanced again, and the bottom dead center is stopped again there (step S15). Then, the user raises the cloth presser, rotates the cloth N, lowers the cloth presser again, and when a restart command is issued by the S / S key 1 (step S16), zigzag sewing is performed with the point at which the bottom dead center stops as a base point. Is restarted (step S17).

According to the embodiment described above, if the rotation direction of the cloth is set in the square sewing cloth rotation direction setting key 4 at the time of the square sewing by zigzag sewing, the lower position stop point as shown in FIG. Is set to an appropriate side on the left or right side according to the cloth rotating direction, so that no blank spaces can be formed in the corners and excellent corner stitching can be realized.

[0015]

As described above, according to the sewing machine capable of stopping at the lower position according to the present invention, there is an effect that the corner stitching in which a blank can not be made at the corner can be performed.

[Brief description of the drawings]

FIG. 1 is a functional block diagram showing an embodiment of the present invention.

FIG. 2 is a flowchart of an embodiment of the present invention.

FIG. 3 is a flowchart of another embodiment of the present invention.

FIG. 4 is an explanatory diagram of corner sewing in one embodiment of the present invention.

FIG. 5 is an explanatory view of corner sewing in a conventional sewing machine.

[Explanation of symbols]

1: S / S key, 2: Speed controller, 3: Lower stop key, 4: Square sewing cloth rotation direction setting key, 5: Pattern selection key, 10: Program storage device, 11: Temporary storage device, 12: Lower stop Control program storage device, 20: needle run-out detection sensor, 21: cloth press operation detection sensor, 10
0: CPU, 101: program storage device, 102: display control device, 103: display device, 110: sewing machine motor drive circuit, 111: sewing machine motor, 112: stitch forming mechanism, 113: rotation detection sensor, 114: upper shaft Rotation phase detection sensor.

Claims (2)

[Claims] 1. A sewing machine capable of zigzag sewing and stopping a needle at a lower position, means for giving zigzag sewing data, and stopping the needle at a lower position on either side of the zigzag direction of the zigzag sewing. Means for instructing whether to stop the hand at the lower position, and means for instructing the needle to stop at the lower position. In response to the instruction by the means for instructing, the side indicated by the means for instructing Means for stopping the needle in the lower position, a sewing machine capable of stopping the lower position. 2. The method according to claim 1, wherein when the side to stop at the lower position is instructed after the stop at the lower position, the means for stopping at the lower position is different from the current stop position at the lower position and the designated side. 2. The sewing machine according to claim 1, wherein the sewing machine determines whether or not the sewing machine is different from the sewing machine, and executes the first stitch to stop the lower position again on the designated side.