JPS60129079A - Overlock sewing machine - 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] Technical Field This invention relates to an upper louver that extends from an upper louver base mounted on an upper looper shaft to the needle locus line side and cooperates with a lower looper and a needle to form a single piece. This invention relates to an overlock sewing machine that performs overlock sewing using three needles and three threads.

Conventional technology Normally, one needle, three thread overlock stitches are performed to prevent fraying of the edges of processed fabrics, but this one needle, three thread overlock stitch is performed on thin fabrics. This causes wrinkles and impairs the appearance. For this reason, conventional overlock sewing machines that perform single-needle, three-thread overlock stitches
After removing the upper looper from the upper looper shaft, attach the key looper and perform single-needle, double-thread overlock stitching on thin workpiece fabric in this state. There was a problem in that not only the work was done on a regular basis, but also skill was required to adjust the gap between the louver and the needle.

In order to solve this problem, for example, JP-A-54-11
An overlock sewing machine capable of performing one-needle, three-thread overlock stitches has been proposed in the past, as described in Japanese Patent No. 5948. In other words, when performing single-needle, double-thread overlock sewing with this overlock sewing machine, after rotating the looper claw provided on the upper looper mounting base, the upper looper claw is rotated along the center line of the same movement. Move it to the looper side and engage the tip with the thread hole of the upper looper.
It is designed to form a pa.

However, in this conventional configuration, when forming the key looper, it is necessary to rotate the looper claw and move the louver claw to engage the thread hole, and the operations are not only the same but also There is a problem that the configuration for this becomes complicated.

Purpose of the Invention The present invention has been made in view of the above-mentioned circumstances, and its purpose is to provide an overlock sewing machine that can form a hooked looper with one touch without the need to remove the upper looper. It is in.

Structure of the Invention In order to achieve the above object, the present invention provides a distal end whose base end is slidably supported on the upper looper stand or the upper looper shaft, and which extends from the base end toward the distal end side of the lower looper. an engagement plate having a retaining portion that engages near the tip of the upper looper to form a key looper; and a holding means for holding the retaining plate in the non-working position, and by holding the engaging plate in the working position, it is possible to perform single-needle, double-thread overlock stitching. It is something.

FIRST EMBODIMENT Hereinafter, a first embodiment embodying this invention will be described in FIGS. 1 to 7.
This will be explained according to the diagram. As shown in Fig. 1, the lower frame 1 of the overlock sewing machine has a swing shaft 2 extending back and forth.
is provided, and the operating lever 3 is attached to the base end of the swing shaft 2. An upper louver 4 is rotatably attached to the tip of the operating lever 3, and is inserted into and slidably guided by an upper louver shaft guide 5 rotatably provided on the front surface of the lower frame 1. It has become. An upper looper stand 6 is fitted into and supported by the small diameter portion 4a of the upper looper shaft 4, and a screw 7
It is fixed by An upper looper 8 is integrally formed on the left side of the lower looper base 6 and extends toward the lower movement trajectory of the needle 9 having a thread insertion hole 9a. After t>j1, a thread insertion hole 8a is formed which passes through G.

A lower louver swing shaft 1o is swingably supported on the lower frame 1, and a lower louper operating lever 11 is attached to the lower louper swing shaft 1o at its base end. A lower looper 12 is attached to the tip of the lower looper operating lever 11, and a thread insertion hole 12a is formed at the tip.

A support body 13 having an inverted side profile is attached to the upper looper base 6 by screws 14, and a sliding guide extending in the left-right direction perpendicular to the axis of the upper looper shaft 4 is provided on the upper surface of the support body 13. A groove 13a is formed. An engagement plate 15 is supported in the sliding guide groove 13a of the support Vf-13 so as to be slidable in the left-right direction with its base end held in place. At the tip of the curved portion 15a,
A retaining portion 15b, which is relatively engaged with the recess 8b formed on the upper edge near the tip of the upper looper 8 from the upper right side to form the key looper 16, is provided to protrude downward.

In addition, in this embodiment, as shown in FIGS. 6 and 7, the upper looper 8
A substantially triangular guide groove 8c in plan view, which is continuous to the recess 8b, is formed on the two sides of the plate, and the engaging portion 15b of the engaging plate 15 is guided into the recess 8b through the guide groove 8c. It has become so. Note that instead of this configuration, for example, the eighth
As shown in the figure, the engaging portion 15b is rotated and protruded to the left in the sliding direction of the engaging plate 15, but instead of forming the recess 8b on the upper louver 8 to open upward to the right, Joint part 15
b may be configured to be securely engaged within the recess 8b.

In this embodiment, the engaging portion 15 of the engaging plate 15
As shown in FIG. 2, b is the working position where the lower looper 8 is engaged with the recess 8b, and the inactive position is where it is spaced apart from the recess 8b as shown in FIG. Holding means 17 for holding the plywood 15 are provided.

That is, an elastic member 18 made of a leaf spring having an inverted side profile is disposed on the support body 13, and
are fastened together to the upper looper stand 6. Then, the upper plate portion of the elastic member 18 comes into sliding contact with the upper surface of the proximal end of the engagement plate 15, and thereafter elastically biases and holds the plywood 15 in either the working position or the non-working position. It's happening.

Further, an operating knob 19 as an operating member is provided at the upper right end of the engagement plate 15 via a bent piece. It can be moved to the position of

Further, between the engagement plate 15 and the elastic member 1B,
A positioning member 20 is provided for positioning the engagement plate 15 in an active position and a non-active position. That is, a pair of positioning holes 21a and 21b are formed at the base end of the engagement plate 15, and a positioning protrusion 22 is formed on the lower surface of the upper plate portion of the elastic member 1B. The alignment plate 15 is positioned by engagement with the plate 21b.

The operation of the overlock sewing machine configured as described above will now be explained.

First, when performing one-needle, three-thread overlock stitch using this sewing machine, thread the thread through each thread insertion hole 9a, 8a, 12a of the needle 9, upper louver 8, and lower looper 12, and When the engagement plate 15 is slid to the right using the operation knob 19,
The positioning protrusion 22 of the positioning member 20 engages with the position 1L positioning hole 21b on the left side, and the retaining plate 15 has an engaging portion 15b at its tip that is spaced apart from the recess 8b of the upper louver 8, as shown in FIG. Positioned and held in the working position. Therefore, if the sewing machine is operated in this state, the upper roots < 8 will be the lower looper 1.
2 and the needle 9, and their thread insertion holes 8a
, 12a, 9aG can be twisted to perform a one-needle three-thread overlock stitch.

Next, when performing single-needle, double-thread overlock sewing using this overlock sewing machine, pull out the thread from the thread insertion hole 8a of the upper louver 8, and use the operation knob 19 to move the engagement plate 15 to the left. When the engagement plate 15 is slid in the opposite direction, the positioning protrusion 22 engages with the positioning hole 21a on the right side, and the engagement portion 15b at the tip of the engagement plate 15 engages with the recess 8b of the upper looper 8, as shown in FIG. The combined working position is positioned and maintained.

Therefore, in this state, the hook looper 16 is formed by threading the engaging portion 15b and the tip of the upper looper 8, and when the sewing machine is operated in this state, the needle 9, the lower looper 12, and the key looper 16 are moved at a predetermined timing. When activated, one-needle, two-thread overlock stitching can be performed using two threads inserted through the needle 9 and the thread insertion holes 9a and 12al of the lower looper 12, respectively.

As described above, in this embodiment, the state in which the key looper 16 is formed and the state in which the key looper 16 is not formed can be easily changed by the extremely simple operation of sliding the engagement plate 15 to the left or right using the operating knob 19. In addition, the engagement plate 15 can be switched between the operating position and the key looper 1 by the urging force of the elastic member 18 of the holding means 11 and the positioning action of the positioning member 2o.
It is precisely and firmly positioned and held in the inactive position that does not form 6. Therefore, there is no need to worry about the engagement plate 15 moving accidentally and changing its set position while the sewing machine is operating, and it is possible to stably perform single-needle, triple-thread or single-needle, triple-thread overedge stitching. .

Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIGS. 9 and 1o. This embodiment differs from the first embodiment in the sliding guide structure of the engagement plate 15. That is, in this embodiment, the sliding guide groove 13a on the support body 13 is formed to extend in the front-back direction perpendicular to the axis of the upper looper shaft 4,
An engagement plate 15 is supported at its base end within this sliding guide groove 13a so as to be slidable in the front-rear direction. Then, using the operating knob 19 provided at the upper front end of the engagement plate 15, the engagement plate 15 is selectively slid between a front working position shown by a solid line in FIG. 10 and a rear non-working position shown by a chain line in FIG. A positioning member 20 consisting of positioning holes 21a, 21b and a positioning protrusion 22 allows these positions to be maintained. Therefore, in this second embodiment, as in the case of the first embodiment, the state in which the key looper 16 is formed and the state in which the key looper 16 is not formed can be switched by a simple sliding operation of the engagement plate 15. Under these switching conditions, single-needle, double-thread or single-needle, triple-thread overlock stitching can be stably performed.

Third Embodiment Next, a third embodiment shown in FIGS. 11 and 12 will be described. This embodiment differs from the above-mentioned first and second embodiments in the sliding guide structure of the engagement plate 15. That is, in this embodiment, a sliding guide groove 13a is formed in the right side hanging portion 23 of the support body 13 so as to extend in the axial direction of the upper looper shaft 4, and a support protrusion 24 is formed on the upper surface of the support body 13. It is set up. In addition, the engagement plate 15 has a fitting hole 25 provided at its base end fitted into the supporting protrusion 24, and a bent portion 26 at the right end fitted into the sliding guide groove 13a. It is supported on a support 13 so as to be slidable in the vertical direction. An operating knob 19 provided at the lower end of the bent portion 26 of the engagement plate 15 selectively moves the engagement plate 15 between a lower working position shown by a solid line in FIG. 11 and an upper non-working position shown by a chain line. The positioning member 2o allows the positioning member 2o to position and maintain the position. Therefore, in this third embodiment as well, the state in which the key looper 16 is formed and the state in which it is not formed can be switched by a simple operation, and the one-needle three-thread or one-needle three-thread overlock stitch can be stably performed. It can be carried out.

Fourth Embodiment Next, the fourth embodiment shown in Figs. 13 and 14 will be described. '+J is different from each embodiment. That is, in this example,
A hanging portion 23 is formed on the right side of the support body 13, and a support portion 27 is provided on two sides of the support body 13. The support portion 27 is provided with an opening 27a having a rectangular cross section. And the engagement plate 15
The right end bent portion 26G is the sliding guide groove 2 extending in the vertical direction.
8 is formed, and the support body 13 is inserted through this sliding guide groove 28.
A stepped screw 29 is screwed into the hanging portion 23 of the holder. As a result, the engagement plate 15 has its proximal front edge aligned with the supporting portion 2 at 6rJ.
It is designed to be able to slide in the vertical direction based on the opening 2a of No. 7.

Further, an elastic member 30 made of a leaf spring having a substantially horizontal U-shape in front is interposed between the upper surface of the support body 13 and the base end of the retaining plate 150, and the elastic force of this elastic member 30 causes the engagement plate to 15
is simultaneously biased to the upper inactive position shown by the dashed line in FIG. An operating member 32 is fitted and supported in a through hole 31 provided in the earthen wall portion of the support portion 27 so as to be movable up and down and rotatably, and has a large diameter portion at its lower end that abuts the upper surface of the proximal end of the engagement plate 15. 33 is formed, and a key 35 that can be engaged with a key groove 34 on the periphery of the through hole 31 is provided on the outer periphery.

Further, in this embodiment, the holding means 17 is constituted by the elastic member 30 and the operating portion 32, and
The large diameter part 33 and the key 35 constitute a positioning part 20. Then, as shown in FIGS. 13 and 14, the operating member 32 is pressed downward against the elastic force of the elastic portion 4A30. When rotated, the key 35
The lower end of the support part 27 engages with the lower surface of the earthen wall, and the retaining plate 15 is positioned and held at the lower operating position shown by the solid line in FIG. 13. From this state, the operating member 32 is rotated When the key 35 is aligned with the key groove 34, the operating member 32 and the engagement plate 15 are moved upward by the elastic force of the elastic member 30, and the large diameter portion 33 is engaged with the lower surface of the earthen wall of the support portion 27. As a result, the engagement plate 15 is positioned and held in the upper inactive position shown by the chain line in FIG. Therefore, in this embodiment as well, by switching between the state in which the key looper 16 is formed and the state in which the key looper 16 is not formed using a simple operation part, one-needle, two-thread or one-needle, three-thread edge stitching can be stably performed. You can do it by doing this.

It should be noted that the present invention is not limited to the configurations of the respective embodiments described above, and the configurations of each part can be changed and embodied as desired without departing from the spirit of the invention.

Effects of the Invention As detailed above, the present invention has an excellent effect in that it is not necessary to remove the upper looper and a key looper can be formed with a single touch.

[Brief explanation of the drawing]

FIG. 1 is a partial front view showing a first embodiment of an overlock sewing machine embodying the present invention, FIG. 2 is a partial front view showing an enlarged configuration of the upper louver portion thereof, and FIG. 4 is a sectional view taken along line A-A in FIG. 2, FIG. 5 is an exploded perspective view of the upper louver, FIG. 6 is a plan view showing an enlarged tip of the upper louver, and FIG. This figure is also a partially enlarged sectional view, and FIG. 8 is a partially sectional view showing different engagement configurations between the recess of the upper looper and the engagement portion of the engagement plate. FIG. 9 is a front view of the upper louver portion showing a second embodiment of the invention;
FIG. 10 is a plan view thereof as well. FIG. 11 is a partially cutaway front view of an upper looper portion showing a third embodiment of the present invention, and FIG. 12 is a plan view thereof. FIG. 13 is a partially cutaway front view of an upper looper portion showing a fourth embodiment of the present invention, and FIG. 14 is a plan view thereof. Upper louver shaft 4, upper looper stand 6, upper looper 8, recess 8b,
Needle 9, lower looper 12, support body 13, engagement plate 15, engagement portion 15b1 key looper 16, holding means 17, elastic member 1B
, an operating knob 19 as an operating member, and a positioning member 20
, elastic member 30, operating member 32゜Patent applicant Brother Industries, Ltd. Fig. 1 Fig. 2 M'r Fig. 3 Fig. 4 Fig. 5 Fig. 9 Fig. 10 Fig. 3 Fig. 141

Claims (1)

[Claims] l Upper louver stand (6) mounted on the upper looper shaft (4)
) on the trajectory line side of the needle (9) In the sewing machine, the base end is slidably supported on the upper louver base (6) or the upper looper shaft (4), and the upper looper (8) is supported from the base end.
A retaining portion (forming a key looper (16)) is engaged near the tip of the upper louver (8) with the tip extending on the same tip side as before.
15b), and the engaging portion (15b) of the retaining plate (15) is located between the working position where the upper looper (8) is engaged and the engaging portion (15b) that is spaced apart from the upper looper (8). and a holding means (17) for holding the engagement plate (15) in the operation position, and by holding the engagement plate (15) in the operation position, one-needle, two-thread overlock stitching can be performed. An overlock sewing machine characterized by being able to perform the following operations. 2. The overlock sewing machine according to claim 1, wherein the engagement plate (15) is supported so as to be slidable in a direction orthogonal to the axis of the upper louver shaft (4). 8. The overlock sewing machine according to claim 1, wherein the engagement plate (15) is supported so as to be slidable in the axial direction of the upper looper shaft (4). 4 The holding means (17) includes an elastic member (18, 30) for elastically biasing and holding the engagement plate (15) in either the active position or the non-active position, and the engagement plate (15) and an operation member (19, 32) for moving the engagement plate (15) to the other position against the elastic force of the elastic member (18, 30). An overlock sewing machine according to any one of claims 1 to 3, characterized in that: 5. The holding means (17) includes a positioning part @ (20) for positioning the engagement plate (15) in an active position and a non-active position. The overlock sewing machine according to any one of Item 4.