JP2649523B2 - Buttonhole sewing control method in computer sewing machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to buttonhole sewing in a computer sewing machine, and more particularly to a method for manually controlling the amplitude of a buttonhole.

(Prior Art) Conventionally, automatic buttonhole sewing has been possible in a computer sewing machine, and it is also possible to manually control the amplitude and feed of the buttonhole sewing. However, among several types of buttonholes, buttonholes such as a keyhole type and a round type are formed of a linear overhang portion and a round overhang portion at the end thereof. If the overhang at the end is round, manual adjustment of the amplitude will damage the appearance or image of the round end of the keyhole and round shapes.

(Problems to be Solved by the Invention) The present invention beautifully rounds the round portions at the ends of the keyhole type and round type buttonholes so as not to damage the appearance and image of the keyhole type and round type. It is.

(Means for Solving the Problems) The present invention divides a keyhole type and a round type buttonhole into a portion including most of the left and right edge overcast portions and a partial overcast portion including the round shape portion, and It is possible to manually adjust the amplitude and feed of the overlocking part, and the round part can be manually adjusted only for the feed, making it invariant to the amplitude, so that beautiful keyhole type and round type buttonholes are sewn. Is what you do.

(Function) The present invention provides a needle bar which is vertically and amplitude-moved in conjunction with the rotation of the upper shaft, a needle fixed to an end of the needle bar, and a cloth presser which is fixed to the needle bar through the cloth presser. A presser bar that presses a cloth, a horizontal shuttle that forms a seam in cooperation with the needle, and a storage device that stores stitch data of a sewing pattern pattern.
A selection key for reading stitch data from the storage device;
Control keys for the amplitude and feed amount of the sewing pattern based on the stitch data are provided, and the keyhole type buttonhole selected by the selection key can be automatically sewn by the automatic buttonhole presser mounted on the presser bar. In the sewing machine, among the stitches of the left overlock portion and the right overlock portion, the right and left linear overlock stitches and the arc portion of the portion where the overlock stitches are combined are formed by changing the stitch of the arc portion to the amplitude control key. This is an automatic buttonhole sewing control method having a constant amplitude portion that is not affected by the operation. For a buttonhole of a type having an arc portion, the other portions are subjected to the amplitude so as not to damage the shape of the arc portion. It is characterized in that the amplitude around the circumference including the arc-shaped portion is made constant while controllable.

(Example) An example of the present invention will be described below.

In FIG. 1, a main shaft 2 is rotatably supported on an arm machine frame 1 of the sewing machine. A needle bar 3 is supported on a needle bar support 4 at an end of the arm machine frame 1 so that the main shaft 2 rotates. The needle bar 3 is moved up and down in conjunction with it, and the needle bar 3 is controlled in its lateral movement by an amplitude control stepping motor 5.
The presser bar 6 is supported in parallel with the needle bar, is pressed downward by a spring 7, and a cloth presser 8 is detachably fixed to a lower end thereof with a tightening screw 9.

A lower shaft 11, which is rotated in time with the upper shaft 2, is rotatably supported on a bed machine frame 10 combined with the arm machine frame 1, and rotates in conjunction with the rotation of the lower shaft. A thread catching portion (not shown) is formed on an outer peripheral portion of the horizontal full rotary hook 12 to be used, and the upper thread carried by the needle 13 attached to the lower end of the needle bar 3 by the thread catching portion (see FIG. (Not shown).

Reference numeral 14 denotes a feed dog fixed to a feed base 15, and the feed dog 14 is moved four times by the cooperative movement of a horizontal feed shaft 16 and a vertical feed shaft 17 which are swung in conjunction with the rotation of the lower shaft 11. The horizontal stepping momentum is controlled by the control stepping motor 18.

Reference numeral 19 denotes an operation panel mounted on the front surface of the upright body of the arm machine frame 1. The operation panel includes ten-key type selection operation keys 20, 20,... For selecting a sewing pattern, an amplitude control key 21,
A feed control key 22 and various buttonholes such as bar tack, round, and keyhole type buttonhole selection keys 23, 24, and 25 are provided, and the various keys stored in the storage device 26 by operating the selection keys. The stitch data of the sewing pattern and the stitch data of various buttonholes are read out, and the read out stitch data is sent to the CPU (Central Processing Unit) 2
7 controls the amplitude and the feed amount. When the buttonhole selection keys 23, 24, 25 are operated to automatically sew various buttonholes, an automatic buttonhole presser 28 is used instead of the general-purpose cloth presser 8 shown in FIG. Use FIG. 3 is an exploded configuration diagram of the automatic buttonhole presser.

That is, the slider 30 is removably fixed to the holding rod 6 by the attachment 30, and a slider portion 31 is pivotally connected to the lower end of the attachment via the thin shaft 32. The moving frame 33 is a rectangular cloth holding frame, and both sides are bent into a U-shape, and both edges of the slider 31 are slidably fitted in the bent portion, and a hole for needle penetration is formed in the center. Elastic cloth slip prevention members 34, 34 are adhered to the lower surface, a spring chamber 35 is fixed to one end in the longitudinal direction of the moving frame, and a spring 36 is provided in the spring chamber. A first detecting portion 39 extending with the slider 31 is provided, and one end of the spring 36 is locked to the slider 31.

Also, a button holding moving frame 37 for holding one of the buttons is movable at the other end of the moving frame 33 while being supported in the moving frame 33, so that the other of the buttons fixed to the moving frame 33 is held. A button of a desired size is pinched in cooperation with the fixing frame 38 to be formed. The button holding moving frame 27 is provided with an extended second detection unit 40. Reference numeral 41 denotes a sensor lever, which is rotatably mounted on the mounting portion 30. The sensor lever is provided with a terminal 42 extending downward and an operating end 43 extending upward and forming a flat surface at the upper end. Have been. Reference numeral 44 denotes a cover for the sensor lever 41, and a light emitting hole 45 is provided at a suitable upper portion.

Since the distance between the first detection unit 39 and the second detection unit 40 is determined in conjunction with the desired button size by the automatic buttonhole press having the above configuration, the buttonhole size is also ideal. Things are obtained.

More specifically, the turning point of the left and right overlock portions will be described. When the movable frame 33 is pulled by the action of the spring 36 and the spring chamber 35 is moved toward the slider portion 31 supported by the mounting portion, the sensor lever 41 Since the lower terminal 42 is lifted up for the first detecting portion 39, the sensor lever 41 rotates, and the upper working end 43 moves from the position A to the position A '. A transition signal to the next step is transmitted from the CPU 27. In this state, the sewing machine is rotated by driving the drive motor M by operating the controller C, so that the sewing of the buttonhole on the left side of the buttonhole proceeds from one end to the other end. Since the lower terminal 42 of the sensor lever descends from the first detector 39, the upper working end 43 receives light from the photo sensor 46, and this state is maintained until the sensor lever 41 is rotated. When the other end is reached and the lower terminal 42 of the sensor lever 41 is rotated by the action of the second detector 40, the CP
Upon receiving a signal from U27 to the next step, the needle shifts to the right overlock portion, and sewing of the right overlock portion proceeds. When the sensor lever 41 reaches one end of the departure position, the sensor lever 41 is raised three times and retracts from the light reception of the photo sensor, whereby the sewing machine is stopped and the buttonhole is completed.

According to the present invention, an optimum buttonhole overlock can be obtained by using the apparatus having the above-described configuration as described above. However, when the keyhole type and the round type are described, the width is reduced by amplitude control in the conventional example. Then, the shape of the arc-shaped end is crushed and the appearance is significantly impaired, but the present invention does not change the shape of the arc-shaped end even if the overall overlock sewing width is amplitude controlled. It was done.

First, referring to FIGS. 6 to 8, the operation order of the keyhole-shaped buttonholes will be described.
The second step is a 1 "to N" needle, and the third step is a C section of the 1 to 26 needles shown in FIG. The fourth step is a bar portion indicated by the 1 st to 15 st needles in FIG.

When it is desired to control the width of such a keyhole type buttonhole, the amplitude control key 21 is operated to reduce or enlarge only the amplitude of the B portion of the first step, the D portion of the third step, and the fourth step. Controlled but first
The amplitude stepping motor 5 is stored in the storage device without any correction for the portion A of the step, the portion C of the third step, and the stitch data of the second step.
Since the amplitude is constant and cannot be reduced or enlarged, the amplitude control operation is given to control the overlocking side of the flat part, and the arc-shaped part is completely invariable. Will not be crushed. As for the control of the feed amount, the feed pitch of all the steps can be controlled simultaneously by operating the feed control key 22 manually.

Since the present invention has the above-described configuration and operation, if the buttonholes are automatically operated and sequentially operated properly, various buttonholes having an appropriate size are automatically and repeatedly sewn. Of course, in the case of a buttonhole with one end having an arc shape such as a keyhole shape or a round shape, it is possible to control the amplitude and feed of the amplitude, but the amplitude of only the arc portion is Since the shape is not changed, the shape of the arc-shaped portion is prevented from being crushed, which has a practical effect.

[Brief description of the drawings]

The drawings show the present invention. FIG. 1 is an external view of a sewing machine equipped with the present invention, FIG. 2 is a block diagram of the present invention, and FIG.
The figure is an exploded perspective view of the automatic buttonhole presser of the present invention, and FIG.
The figure is an enlarged sectional view of the main part of the automatic buttonhole presser of the present invention,
FIG. 5 is an enlarged sectional side view of a main part of the automatic buttonhole presser of the present invention, and FIGS. 6, 7, and 8 are stitch shape diagrams showing steps of a keyhole type buttonhole according to the present invention. , 6 is a presser bar, 12 is a horizontal hook, 20 is an operation key for selection,
26 is a storage device.

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Claims (1)

(57) [Claims] A needle bar fixedly attached to a cloth presser to press a fabric to be sewn; a needle fixed to a lower end of the needle bar; A horizontal hook provided with a thread catching portion which cooperates to form a stitch; a storage device storing stitch data of a sewing pattern; a selection key for reading stitch data from the storage device by operation; A sewing machine having a control key for adjusting the amplitude of a sewing pattern according to data, and capable of automatically sewing a keyhole buttonhole selected by the selection key by an automatic buttonhole presser mounted on the presser bar; Wherein the keyhole buttonhole includes forming a plurality of stitches on the left and right linear overhangs and forming a stitch on the keyhole arcuate portion, The amplitude of the plurality of linear stitches of the left overlock portion and the right overlock portion is controlled by operating the amplitude control key, and the keyhole type arc stitch has an amplitude corresponding to the operation of the amplitude control key. Automatic buttonhole stitching control method, characterized in that the pressure is constant.