JPH01121087A - Method for control of button hole sewing in computer sewing machine - Google Patents

Abstract

PURPOSE: To enable a beautiful linking to be carried out by dividing a buttonhole into a portion including most of left and right linking parts and a partial linking portion including a round part, making the amplitude and feeds of left and right linking parts manually adjustable, and making only the feed manually adjustable and the amplitude invariable in the round part. CONSTITUTION: As for the operation order of key hole shaped buttonhole, a first step is composed of a part A from 1 to 27 stitches and a part B from 1' to N' stitches, a second step is from 1" to N" stitches, a third step is composed of a part C from 1 to 26 stitches and a part D from 1' to N' stitches and a fourth step becomes a crosspiece part shown by 1 to 15 stitches. When it is desired to control the width of the buttonhole, by operating a key for amplitude control, only the parts B and C in the first and third steps and amplitude in the fourth step are controlled to be reduced or expanded but the parts A and C in the first and third steps and stitch data in the second step are transmitted to an amplitude stepping motor 5 as stored in a storage device without being corrected, and since the amplitude is controlled on the side of fixed and flat hem and an arcuate part is not changed at all, the key hole shape can be prevented from being crushed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to buttonhole sewing in a computerized sewing machine, and particularly to a method for manually controlling the amplitude of a buttonhole.

(Prior Art) Conventionally, automatic buttonhole sewing has been possible with computerized sewing machines, and it has also been possible to manually control the amplitude and feed of buttonhole sewing. However, among several types of buttonhole shapes, such as keyhole and round buttonholes, when the overlocking part at the end of the buttonhole is round, manual adjustment of the amplitude will change the rounded end of the keyhole or round buttonhole. The department's appearance or image may be damaged.

(Problems to be Solved by the Invention) The present invention is a buttonhole in which the round part at the end of a keyhole-type buttonhole or a round-type buttonhole is beautifully stitched so as not to spoil the appearance and image of the keyhole-type or round-type buttonhole. It is.

(Means for Solving the Problems) The present invention divides keyhole-type and round-type buttonholes into a part that includes most of the left and right overlocking parts, and a part of the left and right overlocking parts that include the round part. It is possible to manually adjust the amplitude and feed of the overlocking part, and for the round part, only the feed can be manually adjusted, but the amplitude remains unchanged, so that beautiful keyhole and round buttonholes can be sewn. It is something to do.

(Function) The present invention provides a needle bar that is caused to move up and down and in amplitude in conjunction with the rotation of the upper shaft, a needle that is fixed to the end of the needle bar, and a fabric presser that is fixedly attached to the fabric presser through the fabric presser. a presser foot that presses down the cloth; a horizontal hook that cooperates with the needle to form stitches; a storage device that stores stitch data of the sewing pattern; and a selection key that reads the stitch data from the storage device. and a control key for controlling the amplitude or feed amount of the sewing pattern according to the stitch data, and automatically sews a keyhole type buttonhole selected by the selection key by an automatic buttonhole presser attached to the presser foot. On possible sewing machines,
Of the stitches in the left side overlocking part and the right side overcasting part, only some of the plurality of stitches, including the arcuate part of the part where both left and right overlock stitches are joined, have a constant amplitude part that is not affected by the operation of the amplitude control key. This is an automatic buttonhole sewing control method for buttonholes that have an arcuate part, so that the amplitude around the arcuate part can be controlled while controlling the amplitude of other parts so as not to damage the shape of the arcuate part. It is characterized by keeping constant.

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

In FIG. 1, a main shaft 2 is rotatably supported on an arm frame l of a sewing machine, and a needle bar 3 is attached to the end of the arm frame 1.
is supported by a needle bar support 4 and is moved downward in conjunction with the rotation of the main sleeve 2, and the lateral movement of the needle bar 3 is controlled by a stepping motor 5 for amplitude control.

The presser bar 6 is supported parallel to the needle bar 1 and pressed downward by a spring 7, and a cloth presser 8 is removably fixed to the lower end with a tightening screw 9.

A lower shaft 11, which is rotated in synchronization with the upper shaft 2, is rotatably supported on the bed machine frame 10 coupled to the arm machine frame 1. Rotate 1
．． A thread ring catcher (not shown) is formed on the outer periphery of the horizontal full-rotation hook 12. A thread (not shown) is what is captured.

A feed dog 14 is fixed to a feed base 15, and the feed dog 14 is interlocked with four feeds by the cooperative movement of a horizontal feed shaft 16 and a vertical feed shaft 17, which are oscillated in conjunction with the rotation of the lower shaft 11. The horizontal feed momentum is controlled by a feed control steering/knobbing motor 18.

Reference numeral 19 denotes an operation panel, which is mounted on the front surface of the vertical body of the arm machine frame L, and includes ten-key selection operation keys 20, 20, 20, 20, 20, etc. for amplitude control. key 21, a feed control key 22, and buttonhole selection keys 23, 24, and 25 for various buttonholes, such as part tuck, round, and keyhole. The stitch data of the various sewing patterns and the stitch data of the various buttonholes marked with circles are read out, and the amplitude and feed amount of the read stitch data are controlled via a CPU (central processing unit) 27. Moeki buttonhole selection key 23
, 24 and 25 to automatically sew various buttonholes, an automatic buttonhole presser 28 is used in place of the general-purpose cloth presser 8 shown in FIG. An exploded configuration diagram of the automatic buttonhole presser is shown in FIG.

That is, it is removably fixed to the presser bar 6 by a fixture 30, and a slider portion 31 is pivotally attached to the lower end of the fixture via a thin shaft 32. The moving frame 33 is a rectangular presser frame with both sides bent in a U-shape (7), and both edges of the slider 31 are slidably fitted into the bent portions, and a hole for passing a needle is provided in the center. A cloth slip prevention member 34 34 made of an elastic material is attached to the lower surface of the movable frame, and a spring chamber 35 is fixed to one end in the longitudinal direction of the moving frame, and a spring 36 is attached to the spring chamber. A first detection portion 39 is provided inside and extends, and one end of the spring 36 is locked to the slider 31.

Further, at the other end of the moving frame 33, a button holding moving frame 37 that holds one of the buttons is supported within the moving frame 33 and can be moved, so that the other button fixed to the front IT2 moving frame 33 can be moved. A button of a desired size is clamped in cooperation with the clamping fixed frame 38. A second detecting section 40 extending from the button holding moving frame 27 is provided. Reference numeral 41 denotes a sensor lever, which is rotatably attached to the mounting portion 30, and the sensor lever is provided with a terminal 42 extending downward and an operating end 43 extending upward and having a flat surface at its upper end. It is being Reference numeral 44 denotes a cover for the sensor lever 41, and a hole 45 for light projection is provided at a proper position on the upper part.

The distance between the first detection section 39 and the second detection section 40 is determined in conjunction with the automatic buttonhole presser configured as described above according to the desired button size, so that the size of the buttonhole is also ideal. You can get the following.

To describe in more detail the folding points of the left and right overhanging parts, the movable frame 33 is pulled by the action of the spring 36, and the spring chamber part 35 is attached to the slider part 31 supported by the mounting part.
When the lower terminal 42 of the sensor lever 41 is brought to the
The sensor lever 41 is lifted up for the detection part 39.
rotates and the upper working end 43 moves from the position A to the position A, and is removed from the line of action of the photosensor 46, thereby transmitting a transition signal to the next step from the CPU 27. In this state, the sewing machine is rotated by driving the drive motor M through the operation of the controller C, so that the construction of the left overlock portion of the buttonhole progresses from one end to the other end. The lower terminal 42 of the sensor lever is the first
Since it descends from the detection part 39, the upper working end 43 is in a state where it is received by the photo sensor 46, and in that state, the sensor lever 4
It is maintained continuously until 1 is rotated. When the needle reaches the other end and the lower terminal 42 of the sensor lever 41 is rotated by the action of the second detection section 40 and receives a signal to proceed to the next step from the CPU 27, the needle moves to the right overhanging section. The configuration of the right side hook is progressing. When one end of the starting position is reached, the sensor lever 41 is lifted a third time to avoid receiving light from the photosensor, thereby stopping the sewing machine and completing the buttonhole.

According to the present invention, an optimal buttonhole stitching can be obtained by using a device having such a configuration and performing the above-described process.However, regarding the keyhole type and round type buttonholes, in the conventional example, the width is reduced by amplitude control. In this case, the shape of the arcuate end becomes crushed, resulting in a significantly impaired appearance. However, the present invention allows the shape of the arcuate end to remain unchanged even if the amplitude of the entire gutter is controlled. , Tachino.

First, referring to Figures 6 to 8, we will describe the order of movement of the keyhole-shaped buttonholes.The first step is 1 to 2 in Figure 6.
It consists of part A of 7 needles and part B of 1" to N" needles, the second step is 1" to N" total, and the third step is part 0 and 1 of needles 1 to 26 in Figure 7. It consists of the D part of the needle from ' to N'.
The fourth step is the interval shown by stitches 1-15 in FIG.

If you want to control the width of such a keyhole-type buttonhole, by operating the amplitude control key 21, only the amplitudes of section B of the first step, section D of the third step, and amplitude of the fourth step can be reduced or ( However, part A of the first step, part 0 of the third step, and step data of the second step are stored in the storage device and transmitted to the swing width stepping motor 5 without any correction. Since the amplitude is constant and cannot be reduced or enlarged, the amplitude is controlled on the overlay line side of the flat part, and the arcuate part remains completely unchanged, so the keyhole shape is collapsed. The feed rate cannot be controlled manually using the feed control gear 2.
By operating 2, the feed bits of all steps can be controlled simultaneously.

Since the present invention has the above-described structure and operation, if the automatic buttonhole presser foot is attached and the operations are performed properly in sequence, various buttonholes of appropriate sizes will be automatically sewn repeatedly. Of course, it is possible to control the swing width and feed for buttonholes that have an arc shape at one end, such as a keyhole shape or a round shape, but only for the arc shape part. Since the amplitude of is kept unchanged, the arcuate portion is prevented from being crushed into a round shape, which has a practical effect.

[Brief explanation of the drawing]

The drawings show the present invention. Figure 1 is an external view of a sewing machine equipped with the present invention, Figure 2 is a block diagram of the present invention, and Figure 3 is a block diagram of the present invention.
The figure is an exploded perspective view of the automatic buttonhole presser of the present invention.
The figure is an enlarged sectional view of the main parts of the automatic buttonhole presser of the present invention.
Fig. 5 is an enlarged cross-sectional side view of the main part of the automatic buttonhole presser of the present invention, Fig. 6゜7.8 is a stitch shape diagram showing each step of the keyhole type buttonhole according to the present invention,
: 3 is a needle bar, 6 is a presser bar, 12 is a horizontal hook, 20 is a selection operation key, and 26 is a storage device.

Claims (1)

[Claims] A needle bar that moves up and down and in amplitude in conjunction with the rotation of the upper shaft; a presser bar that fixes a fabric presser and presses the fabric to be sewn;
a horizontal hook provided with a thread loop catcher that cooperates with the needle fixed to the lower end of the needle bar to form a stitch; a storage device storing stitch data of a sewing pattern; It is equipped with a selection key for reading out stitch data and a key for controlling the amplitude or feed amount of the sewing pattern based on the stitch data, and the keyhole type buttonhole selected by the selection key is pressed by the automatic buttonhole presser attached to the presser foot. In a sewing machine that can sew automatically, among the plurality of stitches on the left side overlocking part and the right side overlocking part, by operating the amplitude control key, excluding some stitches including the keyhole-shaped arc-shaped part, the stitches can be reduced or enlarged. An automatic buttonhole sewing control method in which some stitches including the arcuate portion are sewn with a constant amplitude.