JPS639485A - Method for sewing button hole - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application] The present invention relates to a buttonhole cutting method in which both the left and right edges are fed in the same direction.

[Conventional technology]

If the stitches are different from the reverse feed, one of the stitches is likely to be a part-ef stitch and the other is a pitch stitch.
The disadvantages were that the stitches looked the same and looked 17, and since the feed was forward and reverse, it was cumbersome to have to match the left and right feed pitches. In order to solve this problem, the technique of U.S. Pat. No. 2,977,913, shown in FIG. By inserting a straight line in , the other side stitch is sewn in the same direction. The buttonhole sewing method of US Pat. No. 3,570,433 shown in FIG. 6 involves inserting a skip stitch before sewing both side stitches.

[Problems to be solved by the invention] However, all of these techniques require a crossing thread to sew from the same direction, and especially in the case of the former, they have the disadvantage that the left and right stitches look different, and In the latter case, there are disadvantages in that many sewing steps are required to make the feeding direction of left and right side stitches the same, and it takes a long time to sew one buttonhole.

The present invention has been made to solve the above-mentioned drawbacks, and its purpose is to be able to sew left and right side stitches from the same direction, eliminate the process of sewing an extra thread called a crossover thread, and thereby Our objective is to provide buttonhole combs that always have a good appearance.

[Means for solving problems]

In order to achieve the above-mentioned buttonhole sewing, in the buttonhole sewing method in which the narrow parts on both sides are sewn from the same direction, one of the narrow parts on both sides is sewn to a predetermined length, the thread is cut, and the main shaft of the sewing machine and the needle bar are connected. is disengaged, the sewing cloth is fed in the direction opposite to the one side line section, moved to the start position of the other side sewing section, and the main shaft and needle bar are connected to start the other side sewing section. Invented a buttonhole sewing method characterized by sewing the buttonhole section.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the accompanying drawings. Reference numeral 1 shown in FIG. 4 is a buttonhole presser foot, and this buttonhole presser foot 1 is provided close to the upper surface of the throat plate 10 from the bottom i of the head H of the sewing machine frame F shown in FIG. The needle plate 10 is supported by the presser foot support 2 disposed on the side opposite to the operator of the needle bar 11, which moves up and down in conjunction with the main shaft.
Alternatively, it is mounted so as to be able to approach and separate in the vertical direction with respect to the feed m3. 4 is provided below from the head I, and a fulcrum 4α
The detection lever is pivotally mounted to be rotatable in the feeding direction about the buttonhole presser foot 1, and its tip 46 is disposed between the protrusions 5, 5 which protrude upward from the buttonhole presser foot 1. The interval between the protrusions 5, 5 is adjusted to the length of the buttonhole, and the buttonhole presser foot 1 follows the feed movement of the feed m3.
When the lever 4 moves, the detection lever 4 comes into contact with one of the protrusions 5, and one of the switches 6, 6 disposed opposite to each other at the base end 4C of the detection lever 4 is turned on, and the side sewing of the buttonhole is started (completed). Detect.

In FIG. 5, reference numeral 12 denotes a rocking base for supporting the needle bar 11, which is pivotally mounted by a pin 12α provided on the head H so as to be rockable at right angles to the cloth feeding direction, thereby enabling zigzag stitching.

13 is a detachable link, and a pin 14 is attached to the rocking table 12.
A rocking base spring 15 is pivotally connected to the rocking base 12 and is provided between the rocking base 12 and the rocking base spring 15.
The cut-off link 16 is moved to the stopper 12b by an elastic force that resists the zigzag drive by the oscillating pulse motor 2V, which will be described later.
is in pressure contact with. One end of this disconnection link 13 is pivotally attached to the arm qα of a needle swing pulse motor, W, through a swing ring 16, and is attached to the needle bar 11 by the reciprocating drive of this needle swing pulse motor M in the needle picking section S. The needle N swings in a zigzag pattern.

A cutting-off action piece 13α protrudes from the other end of the cutting-off link 13, which rotates the oscillating pulse motor 1W beyond the oscillating section S (position iS+) t, and rotates the oscillating table 12 to the stopper 17.
When the oscillating table spring 15 is stretched and the disconnection link is rotated (arrow T)
This cutting/disengaging piece 13α disengages the needle bar connecting pin (not shown) and disconnects the main shaft and the needle bar 11.

When the needle swing pulse motor M is returned to the needle swing section S, the needle bar connecting pin is engaged with the initial position by the spring mechanism, and the connection between the main shaft and the needle bar 11 is restored.

20 is a well-known thread cutting mechanism that cuts the upper thread and lower thread of the sewing machine at the end of sewing, and when the thread cutting lever/id 21 is turned on,
A thread cutting cam is rotated by a lower shaft 22 that is linked to the main shaft, and a thread cutting knife cuts the thread in conjunction with the thread cutting cam. Next, the operation of this embodiment will be explained based on the flowchart shown in FIG.

First, adjust the distance between the protrusions 5, 5 of the buttonhole presser foot 1 to the length of the buttonhole, lower the buttonhole presser foot 1 onto the fabric to be sewn, and press the tip of the detection lever 4! 4b is brought into contact with one of the protrusions 5, and one of the switches 6 is turned on.

In this state, when you turn on the start switch of the sewing machine (sr
Ep-1), After several tacking stitches (STEp-2), form the bar tacking part (Fig. 1 A), 5Tzp-3), and enter the left side side stitch (Fig. 1 opening) (STEP-4). ). As the zigzag stitching progresses for this side stitching, the buttonhole presser foot 1 moves in the feed direction together with the fabric to be sewn in conjunction with the feed movement of the feed m6, and when a predetermined length is reached, the switch 6 is turned on by the detection lever 4. do. After receiving this ON signal (5T E
P-5), a low speed signal is output from a speed control circuit (not shown), C3TEP-6), and several tacking stitches are performed (STEP-7).

Next, turn on the thread trimming solenoid 21 and thread trimming machine [20
Activate (STEP-8) and cut the thread forming side i (STEP-9). Then, stop the needle N at the upper position,
When the needle swing pulse motor M is rotated to the position S2 shown in the drawing, the needle bar 11 is disengaged from the main shaft by the disconnection link 13 (STEPlo). Furthermore, when the sewing machine is driven with the feed direction of the feed m6 reversed, the needle bar 11 is stopped at the upper position and is continuously fed in the opposite direction to the feed direction of the left side stitch (opening in Figure 1) (srp:p- 11) When the sewing machine returns to the sewing start position, the detection lever 4 turns on the switch 6 to stop the idle feed (STEP-12). In this way, it is no longer necessary to sew a crossing thread as shown in FIG. 2 for the purpose of empty feeding.

Next, when the needle swing pulse motor M is returned to the needle swing section S, the needle bar 11 and the main shaft are connected again (STEP-13). As a result, after several tacking stitches (SrHp-14), zigzag stitches on the right side (Fig. 1 C) are sewn (srxp-15).
. When the zigzag stitch on the right side is sewn to a predetermined length, the switch 6 is turned on by the detection lever 4 and the C3TEP-16
), perform bar tacking (Fig. 1, 2), and at the end of this bar tacking, issue a 4M speed signal and sew the tacks (STEP-1).
7). Finally, the thread trimming mechanism 20 is driven to cut the thread (srzp-18), and the sewing machine stops at the top to complete the buttonhole sewing.

When the buttonhole presser foot 1 is lifted from the cloth to be sewn, the movement of the spring spring returns it to the predetermined starting position, completing preparations for sewing the next buttonhole.

In the above example, the right side stitch is started after the left side l, but in contrast, the right side stitch is sewn first, then the side stitch is fed in the opposite direction, and then the bar tack is sewn and then the side stitch is sewn. Even if sewing is included, it is included in the embodiments of the present invention.

In addition, in the present invention, a pulse motor and a disconnection link are used for the engagement and disengagement mechanism between the needle bar and the main shaft, but this does not cause the needle bar to stop while the feed dog is operating. It is clear that any mechanism that can be used will suffice as long as it can be used. Similarly, any type of thread cutting mechanism may be used for the thread cutting mechanism.

〔Effect of the invention〕

As described above based on the embodiments, according to the present invention, the left and right sides L can be sewn from the same direction, so the left and right seams are the same, and there is no need for crossover threads, resulting in a good appearance. It is possible to form buttonholes.

[Brief explanation of drawings]

FIG. 1 shows a buttonhole stitch pattern showing an embodiment of the buttonhole sewing method according to the present invention; FIG.
FIG. 3 is a conventional buttonhole sewing process. FIG. 6 is an operation flowchart. 1... Buttonhole presser foot 4... Detection lever 11... Needle bar 12... Rocking stand 13
...Cut-off link 20...Thread trimming mechanism M...
Needle swing pulse motor N...Name of Hariyama Ganto Tokyo Heavy Equipment Industry Co., Ltd.

Claims (1)

[Claims] In a buttonhole sewing method in which both sides are sewn in the same direction, one of the both sides is sewn to a predetermined length, and the thread is cut to disengage the sewing machine main shaft and the needle bar. A method for sewing a buttonhole, comprising: feeding the sewing cloth in a direction opposite to the one side sewing part, and sewing the other side sewing part by connecting the main shaft and the needle bar.