JP3010104B2 - Eyelet buttonhole sewing method by sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing method for sewing a buttonhole with a sewing machine.

[0002]

2. Description of the Related Art Conventionally, there is a method for sewing a buttonhole by using a buttonhole presser 1 as shown in FIG.

The buttonhole presser 1 is supported by a presser support 2 below the sewing machine head (not shown). A work cloth 5 is sandwiched between the buttonhole presser 1 and a feed dog 4 on the needle plate 3 side of the sewing machine. The work cloth 5 is fed back and forth in accordance with a buttonhole pattern program stored in a sewing machine control device (not shown).

The buttonhole presser 1 has a pair of protrusions 6A and 6B whose diameter in the front-rear direction is equal to the diameter of a button (not shown) to be applied to the buttonhole. Is moved along the buttonhole presser 1 and the work cloth 5 in the front-rear direction by a predetermined distance, the lower end of the detection lever 8 extended from the position detection switch 7 provided on the sewing machine head therebetween is driven. I have.

The position detecting switch 7 is provided with a detecting lever 8
And a first buttonhole press switch (hereinafter referred to as a first switch) 11 and a second buttonhole press switch (hereinafter referred to as a first switch) which the base end 10 selectively presses. 2 switches) 12 and these first
The ON signal of the second switches 11 and 12 is a condition for starting buttonhole sewing or a condition for reversing the buttonhole sewing direction (work cloth feed direction). 4 denotes a needle bar, and 14 denotes a sewing needle attached to the lower end of the needle bar.

Referring to FIG. 5, a process of sewing a buttonhole with a sewing machine will be described.

At the start of buttonhole sewing, a work cloth is set on the sewing machine, and the first switch 11 is turned on with the buttonhole presser foot 1 lowered.

First, as shown in FIG. 5 (A), the left half of the annular portion 15 is sewn, and then the left side linear portion 16 is moved to the left in FIG. And the sewing is performed until the first time the second switch is turned on.

When the second switch 12 is turned on, FIG.
The process proceeds to the step shown in FIG.
In the feed in the opposite direction to (A), the detection lever 8 is pushed counterclockwise by the projection 6A and continues until the first switch 11 is turned on.

When the first switch 11 is turned on, the feeding direction is reversed, and as shown in FIG.
Is sewn.

When the sewing of the right-side linear portion 17 is completed, 2
When the second switch 12 is turned on for the first time , as shown in FIG. 5D, the bar-tacking portion 18 is sewn, the buttonhole sewing is completed, and the sewing machine is stopped.

[0012]

In the conventional buttonhole sewing as described above, the length of the buttonhole in the longitudinal direction of the sewing corresponds to the diameter of the button detected by the pair of protrusions 6A and 6B. , The distance from the first switch 11ON to the second switch 12ON.

Therefore, as compared with a buttonhole of a double bar-tacking without an annular portion of the eye, the length of the hole through which the button passes is
When a buttonhole is provided, there is a problem that the length of the buttonhole is shorter by the width of the annular portion than the buttonhole length in the case of double bar-tacking.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and when buttonhole sewing is performed, the substantial length of the buttonhole is set to the length of the buttonhole in the case of double bar-tacking. It is an object of the present invention to provide a method of sewing a buttonhole with an eye by using a sewing machine configured to be equal.

[0015]

According to the present invention, when the sewing reaches one end or the other end in the longitudinal direction of the buttonhole, the first operation is performed.
Alternatively, the sewing is started with the second buttonhole presser switch being detected and the first buttonhole presser switch is ON, and the sewing is started from the semi-annular portion forming the eyelet, and the one linear portion following this is sewn. inverts the sewing direction in the first of the second buttonhole presser switch oN back to the first buttonhole presser switch oN, the remaining semi-annular portion, while the second button straight portion a second time of the subsequent in eyelet buttonhole sewing method according to the sewing machine to sew up presser switch oN, during sewing of the one and the other straight portion, the first and after the second second button halls presser switch oN, A buttonhole stitch according to a sewing machine, characterized in that the straight portion and the other straight portion are sewn by a distance equal to the width of the annular portion of the eyelet. The above object is achieved by a method.

[0016]

In the present invention, the sewing is started from the ON state of the first buttonhole press switch, the semicircular portion and the linear portion of the eyelet are sewn, and the first second buttonhole press switch is turned ON. After that, and after sewing the remaining semi-annular part and the linear part , the second buttonhole press switch is turned on for the second time. Since the linear portion is sewn, the substantial length of the buttonhole can be made the same as in the case of double bar-tacking.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a buttonhole sewing method using a sewing machine according to the present invention will be described in detail with reference to a flowchart showing the control device of the sewing machine for carrying out the method and the steps of the sewing method. The same or corresponding portions as those shown in FIGS. 4 and 5 are denoted by the same reference numerals as those in FIGS. 4 and 5, and description thereof will be omitted.

First, the control device 50 shown in FIG. 1 will be described.

The controller 50 controls a sewing machine as shown in FIG. 4 and includes a CPU 52, a pattern data ROM 54, a program ROM 56, and a RAM 58.
And a bus 60 for connecting them.

An input interface 62 is connected to the bus 60, and the input interface 62
Through the sewing machine start switch 64, the presser foot lifting switch 68, eyelet switch 70, the first button presser first switch 11, and a second buttonhole push es <br/> switch 12 is connected I have.

The sewing machine start switch 64 is a switch for starting a motor for driving the sewing machine. The presser lifting switch 68 is used to determine whether or not the work cloth is being pressed by the presser support 2 via the buttonhole presser 1. The eyelet switch 70 is turned on when the sewing machine operator sewes the eyelet buttonhole.

An output interface 76 is connected to the bus 60. The output interface 76 is connected to a sewing machine motor 84, a feed amount adjusting motor 86 and a needle swing motor 8 via driving circuits 78, 80 and 82, respectively.
8 are connected.

In the program ROM 56, in addition to a control program for buttonhole sewing shown in the flow chart of FIG. 2, programs necessary for various sewings are stored.

Next, the eyelet buttonhole sewing method according to this embodiment will be described with reference to the flowchart of FIG.

First, after the start, the eyelet buttonhole pattern is selected in step 101, the sewing machine start switch is turned on in step 102, and it is confirmed in step 103 whether the first buttonhole press switch 11 is on. If no, go to step 104 and display an error,
If it is ON, the process proceeds to step 105.

In step 105, the left half of the annular portion 15 in the eyelet is sewn, and then the process proceeds to step 106 .
The left linear portion 16 is sewn continuously to the left semi-annular portion, and the process proceeds to step 107 (see FIG. 3A).

In step 107, it is confirmed whether or not the second buttonhole switch has been turned on. If the second buttonhole switch has not been turned on, the process returns to step 106;
Proceed to 8.

In step 108, by selecting the eyelet buttonhole pattern in step 101, after the first second buttonhole switch is turned on, only the feed amount X, that is, the width of the eyelet annular portion 15, The sewing of the left linear portion 16 in step 106 is added to step 106 (see FIG. 3B), and the process proceeds to step 109.

In step 109, as shown in FIG. 3C, straight stitching is performed in the reverse feed direction until the first buttonhole switch is turned on in step 110.

In step 110, it is confirmed whether or not the first buttonhole switch is ON. If it is not ON, the process returns to step 109, and if it is ON, the process proceeds to step 111.

In step 111, as shown in FIG. 3D, the right half of the annular portion 15 is sewn. Subsequently, in step 112, the right linear portion is sewn, and the process proceeds to step 113. In step 113, it is confirmed whether or not the second buttonhole switch has been turned on for the second time. If it has not been turned on, the process returns to step 112, and if it has been turned on, the process proceeds to step 114.

In step 114, as shown in FIG. 3 (E), the sewing of the right side linear portion 17 is further added by the feed amount X as in step 108, and
Go to 5.

In step 115, the bar-tacking stitch 18 is performed as shown in FIG. 3F, and the buttonhole stitching is completed.

In the case of sewing a buttonhole with both bar-tacks where both ends of the buttonhole are bar-taked, step 101 is executed.
If the selection of the buttonhole pattern is omitted, or if there is a double-buttoning buttonhole pattern selection switch (not shown), it is turned on to execute step 10.
8 and the addition of the linear portion stitching by the feed amount X in the step 114 is omitted, so that the substantial length of the buttonhole is the same as that in the case of double bar-tacking and in the case of the buttonhole stitching. .

[Brief description of the drawings]

FIG. 1 is a block diagram showing a control device of a sewing machine for performing a buttonhole sewing method according to the present invention.

FIG. 2 is a flowchart showing a process of sewing the eyelet buttonhole by the buttonhole sewing method according to the embodiment.

FIG. 3 is a plan view showing a seam in the process of sewing a buttonhole by the same method.

FIG. 4 is a schematic sectional view showing a main part of a sewing machine for performing the buttonhole sewing method according to the present invention.

FIG. 5 is a plan view showing a stitch in the process of sewing a buttonhole according to a conventional buttonhole sewing method.

[Explanation of symbols]

 11: 1st buttonhole press switch 12: 2nd buttonhole press switch 15: annular portion 16, 17: linear portion 18: bar-tacking portion

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-1-121087 (JP, A) JP-A-1-190390 (JP, A) JP-B-63-5716 (JP, B2) (58) Field (Int.Cl. ⁷ , DB name) D05B 3/08

Claims (1)

(57) [Claims] A first or second buttonhole press switch which detects when the sewing reaches one end or the other end in the longitudinal direction of the buttonhole, and starts sewing when the first buttonhole press switch is ON; Start sewing from the semi-annular part that constitutes the eyelet, and then sew one linear part following it. Turn the first buttonhole press switch ON with the first buttonhole press switch ON to reverse the sewing direction.
The sewing machine then sew the remaining linear portion from the remaining semi-circular portion to the second buttonhole press switch ON for the second time. In the case of sewing, once
After the eye and the second second button halls presser switch ON, by a distance equal to the width of the annular portion of the grommet,
A method of sewing buttonholes by a sewing machine, wherein sewing is performed on the one and other linear portions.