JP2612757B2 - Overlock sewing machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an overlock sewing machine that performs overcast sewing.

[Conventional technology]

Conventionally, there are a chain looper, an upper looper, and a lower looper, and two needles provided obliquely in the cloth feeding direction cooperate with each other to form an overlock sewing of five needles and five threads ("JIS L0120"). # 516 [= # 401 + by stitch type classification and display symbol]
# 504] In the overlock sewing machine for performing [stitch No. only]), the upper looper is replaced with a key looper to perform overlock stitching of two needles and four threads # 515.
It is known that [= # 401 + # 503] can be performed.

It is also known that double chain stitching # 401 can be performed by using only a chain looper in the overlock sewing machine.

On the other hand, conventionally, a two-needle 4 having an upper looper and a lower looper, and having two needles in parallel at right angles to the cloth feeding direction.
It is known that in an overlock sewing machine that performs overlock sewing (# 514) of the main thread, it is possible to perform overlock sewing (# 509) of the two-needle and three-thread by replacing the upper looper with a key looper.

Further, the two-needle five-thread overlock sewing machine or two-needle
The overlock sewing machine with four needles can perform overlock sewing (# 504 and # 505) of three needles with one needle.
It is also known that in an overlock sewing machine of three needles, overlock sewing (# 502 and # 503) of the single needle two threads can be performed by replacing the upper looper with a key looper.

That is, the stitches obtained with the two-needle, five-needle, five-thread overlock sewing machine having two needles oblique to the cloth feed are # 516, # 504, # 505, and # 401. The seams obtained by replacing the looper with the key looper are # 515, # 502 and # 503.

Next, seams obtained by an overlock sewing machine of two needles and four threads with upper and lower loopers in which two needles are arranged in parallel at right angles to the cloth feed are # 514, # 504 and # 505. The stitches obtained by replacing the upper looper with the key looper in this sewing machine are # 509, # 502 and # 503.

Recently, a device has been devised in which a looper switching device is operated on an upper looper or an upper looper mounting base and used as a key looper (for example, Japanese Patent Publication No. 56-13478). By using this looper switching device, two needles 5
The stitches obtained with an overlock sewing machine with a chain looper of this thread are # 516 and # 515, (# 504 and # 505) and (# 50
2, # 503), and the stitches obtained with the overlock sewing machine with upper and lower loopers with two needles and four threads are # 514 and # 509,
(# 504, # 505) and (# 502, # 503), and an overlock sewing machine that also serves as the overlock sewing can be used.

[Problems to be solved by the invention]

However, such a conventional overlock sewing machine requires a seam # 514 which requires an arrangement of two needles perpendicular to the cloth feeding direction, and an arrangement of two obliquely similar needles. Cannot be used as the overlock sewing of the seam # 516, and it is necessary to prepare a plurality of types of overlock sewing machines on the side of the sewing machine in order to perform these overlock sewings. is there.

[Means for solving the problem]

The present invention has been made in view of such a conventional technical problem, and has a configuration in which a needle that has a needle thread and moves up and down, a chain looper that can have a chain looper thread, and a thread hole at the tip end are provided. In an overlock sewing machine in which an upper looper capable of having an inserted upper looper thread and a lower looper capable of having a lower looper thread cooperate to perform overlock stitching, the upper looper is in a non-formed state in which a key looper is formed. A needle hole attached to the lower end of the needle bar, the needle holes being individually attachable so that two needles are adjacent to each other in a side-by-side state; A needle stopper which has a needle hole which is located slightly eccentric with respect to the hole in the direction in which the work cloth is fed in the direction in which the work cloth is fed and which is orthogonal to the direction in which the cloth is fed; Overlock sewing of 2 threads, 2 types, Overlock stitching of three needles, 2 types, Overlocking of 3 needles, 1 type, Overlocking of 4 needles, 2 types, Overlocking of 2 needles, 5 threads This is an overlock sewing machine that can also be used for sewing, one type or double chain stitching of one needle and two threads.

[Action]

Thus, according to the present invention, the needle stopper is provided with one or two needles switched to a predetermined position, and the upper looper is switched between a key looper forming state and a key looper non-forming state.
Furthermore, one of a chain looper thread, an upper looper thread or a lower looper thread
Eight types of overlock sewing and 1 using 3 or 3 threads
Different types of double chain stitches can be made. That is, the two needles in the side-by-side state can perform the overlock stitching # 514 of the two needles and the four loops using the needle thread of the two needles in the parallel state and the upper looper thread and the lower looper thread. Using one of the needle thread of one of the needles and the upper looper and the lower looper thread, the overlock stitch # 504 or # 505 of the single needle three thread can be performed to form the key looper, Overlock sewing of three needles of two needles using the needle thread of two needles in parallel and the lower looper thread # 509
Can be performed, using the needle thread of any one of the two needles in a parallel state, the lower looper thread and the key looper,
The overlock stitch # 502 or # 503 of the single needle and two threads can be performed, and the needle thread of one of the two needles and the needle thread of the other one of the two needles which are in a parallel state, Using the upper looper thread, the lower looper thread, and the chain looper thread, the overlock stitch # 516 of the two-needle five-thread can be performed to form the key looper and one of the two needles to be arranged in parallel. Using the needle thread of the needle and the needle thread of one of the other needle holes, the lower looper thread and the chain looper thread, the overlock stitch # 515 of the two needles and the four threads can be performed, and the other needle holes By using the needle thread of one needle and the chain looper thread, double chain stitching # 401 of one needle and two threads can be performed.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

FIG. 1 shows a main part of an overlock sewing machine. The lower end of a needle bar 2 which moves up and down in a sewing machine frame (not shown) functions as three needle holes as shown in FIG. A needle stopper 1 having first and second needle accommodating holes 36, 37 is fixedly provided, and a chain looper 5, a lower looper 6, and an upper looper 7 are provided below the needle bar 2.

The chain looper 5 is located below the needle plate 3,
The upper work cloth 4 moves forward and backward in the cloth feeding direction (the direction of arrow a) and in a direction intersecting with the cloth feeding, and performs double chain stitching in cooperation with a needle C described later. Specifically, Chain Looper 5
Swings around a chain looper shaft 13 perpendicular to the cloth feeding direction (direction of arrow a) and makes a reciprocating swinging motion in the direction of arrow Y shown in FIG. 1, and the looper shaft 13 itself also reciprocates horizontally in the axial direction. exercise.

The lower looper 6 is located below the needle plate 3 at the time of sewing, and moves forward and backward in a direction intersecting the cloth feeding direction of the work cloth 4 (the direction of arrow a). Specifically, the lower looper 6 has a lower looper thread in the thread hole 6a, and swings around a lower looper shaft 12 extending in the front-rear direction of the sewing machine frame, that is, the direction intersecting the cloth feeding direction (the direction of arrow a). Then, a reciprocating swinging motion in the direction of arrow X shown in FIG. 1 is performed.

The upper looper 7 performs overcast sewing in cooperation with the lower looper 6 during sewing.

Here, the overlock sewing machine according to the present invention is different from the conventional overlock sewing machine in the structure of the upper looper 7 and the needle stopper 1 itself, and the other parts, that is, the chain looper 5 are provided.
The lower looper 6 and the lower looper 6 are substantially the same including their drive mechanisms, and the drive mechanisms of the upper looper 7 and the needle stopper 1 are also substantially the same. Will be described in detail.

First, as shown in FIGS.
a. Insert the lower end of the needle bar 2 into a
And three needles A, B and C extending in parallel with the axis of the needle bar 2 can be detachably attached.

For this purpose, the needle stopper 1 is provided with a first needle receiving hole 36 and a second needle receiving hole 37 which are opened on the side opposite to the recess 1a and extend in parallel with the axis of the needle bar 2. The first needle receiving hole 36 is
It is located almost directly below the needle bar 2, extends in a direction perpendicular to the feed direction a of the work cloth 4, and has an oval shape with both ends forming a concave arc. Work cloth 4
And is slightly eccentric in the direction perpendicular to the cloth feeding direction and in the direction perpendicular to the cloth feeding direction (the direction of arrow a), and has a circular cross section.

As shown in FIG. 3, two needles A and B are inserted into the first needle accommodating hole 36 in an adjacent side-by-side state, and are screwed into the needle stopper 1. With the needle set screw 38,
The two needles A and B are detachably attached.
That is, the first needle set screw 38 has a conical tip portion 39,
It penetrates between the two needles A and B and presses against both A and B.

As shown in FIG. 3, one needle C is inserted into the second needle accommodating hole 37, and is detachably attached by a short second needle fixing screw 40 screwed to the needle stopper 1. Mounted. The flat end surface of the second needle set screw 40 is pressed against one needle C.

1, reference numeral 7 denotes an upper looper of the overlock sewing machine, and the upper looper 7 is fixed to the upper end of an upper looper mounting rod 10 by a mounting screw 9 inserted through a mounting seat 8. The upper looper mounting rod 10 slidably penetrates an upper looper guide 11 rotatably provided on a front surface of a sewing machine frame (not shown), and operates in a crossing manner with the cloth feeding direction a of the work cloth 4. Is given to the upper looper 7.

The upper looper 7 has a mounting seat 8 as shown in detail in FIG.
Side wall portion 14 which is bent and connected from the front end of the blade, a blade portion 15 extending from the side wall portion 14 toward the needle A or B side (left side in the figure), and a bracket portion extending upward from the side wall portion 14 twenty five
A guide passage extending from the right base end face of the side wall section 14 to the tip end of the blade section 15 on the front side of the blade section 15
16 are formed. As shown in FIGS. 5 and 6, the guide passage 16 guides the flexible rod-shaped horn 23 which is freely inserted and retracted as shown in FIGS.
, The front end side passage 16b opening on the base end rear surface (upward in FIG. 6) near the thread hole 17 of the blade portion 15 of the upper looper 7.
The extension of the front end side passage 16b is
Crosses in the space on the back side with the thread hole 17 drilled back and forth at the tip of the. The base end of the curved portion 16a is
5 is connected to a base end side passage 16c extending in the longitudinal direction, and the base end side passage 16c has an open front end surface at the tip end in order to reduce the weight of the blade portion 15. A curved protruding portion 18 and a concave portion 19 are continuously formed on the back surface of the distal end portion of the blade portion 15 from the distal end side.

The horn 23 loosely inserted into the guide passage 16 is connected to the distal passage 16b.
When the tip of the horn 23 projects from the opening of the tip passage 16b by a predetermined length, the projecting tip and the tip rear surface of the blade 15 of the upper looper 7 are separated from each other. The key looper 29 shown in FIG. 8 is formed. by the way,
The horn 23 may be made of a steel material having a diameter of about 1 mm, but is preferably made of a plastic single fiber such as nylon. The reason is,
Plastic monofilament has a coefficient of friction with sewing thread, conformability,
This is because they are excellent in terms of wear resistance and the like, and are also excellent in elasticity and workability.

The base end of the horn 23 protruding from the base side passage 16c is held by a holding member 24 as shown in FIGS. That is, the base end of the horn 23 is sandwiched by a holding member 24 which can swing substantially in the longitudinal direction of the base end side passage 16c, and the holding member 24 is inserted into a screw hole of the bracket portion 25 of the upper looper 7. It is pivotally supported by the screwed hinge screw 30. Further, the holding member 24 is formed with an elongated hole 26 substantially perpendicular to the base end side passage 16c, and the through hole 25 of the bracket portion 25 is formed.
A small-diameter eccentric portion 27a of an eccentric pin 27, which is an operation member having a large-diameter portion inserted into a, engages with the elongated hole 26, and the eccentric pin 27 is prevented from coming off by a retaining ring 31 made of a C clip. Therefore, if the eccentric pin 27 is rotated in the forward and reverse directions, the small-diameter eccentric portion 27a
Is eccentrically rotated in the elongated hole 26, so that the holding member 24 is swung about the hinge screw 30 as a fulcrum, whereby the horn
23 can be moved back and forth in the longitudinal direction. And
A U-shaped positioning means 28 is fixed to a screw hole at the lower end of the side wall 14 at the center thereof by adjusting the inclination angle with a screw 32, and the holding member 24 is provided in the upward opening of the positioning means 28. Accepts the lower end. Therefore, the holding member
The operating position of the horn 23 obtained by advancing the lower end of 24 is
The inactive position of the horn 23 obtained by the holding member 24 abutting on the inner edge 28a on the distal end side of the positioning means 28 and the holding member 24 being retracted is determined by the positioning member 28
Is positioned in contact with the base side inner edge 28b. The change in the positioning of the working position and the non-working position by the holding member 24 is performed by loosening the screw 32 and adjusting the inclination angle of the positioning means 28 with respect to the side wall portion 14.

According to the overlock sewing machine configured as described above,
By operating the looper switching device, the upper looper 7 is provided with the formation state of the key looper 29 or is switched to the non-formation state, and furthermore, the three needles A, B, and C are inserted into the needle stopper 1 by the replacement operation. Depending on the combination obtained, various types of overcasting are possible.

Next, the types of overlocking that are possible according to the present invention will be described.

1.2 needle 4 thread overlock stitch # 514.

As shown in FIG. 9, two needles A and B are fitted in the first needle accommodating hole 36 in a side-by-side state, and the overlock stitching of the four needles and four threads is performed. At this time, the two needles A and B are
An end portion 39 having a conical shape of 8 presses between the two needles A and B, and presses both the needles A and B individually against the inner wall of the first needle receiving hole 36. The # 514 seam has two needles
Needle yarns NT1 and NT2 passed through A and B, respectively, and upper looper thread LT1 and thread hole 6a of lower looper 6 passed through thread hole 17 of upper looper 7.
The lower looper thread LT2 passed through is entangled and formed.

2. Overlock stitches # 504 and # 505 of three needles.

As shown in FIGS. 10 and 11, one of the needles A or B attached to the first needle accommodating hole 36 and the upper looper 7 and the lower looper 6 are executed in cooperation with each other. That is, the needle thread NT1 or NT2 passed through the thread hole of the needle A or B, the upper looper thread LT1 passed through the thread hole 17 of the upper looper 7, and the lower looper thread LT2 passed through the thread hole 6a of the lower looper 6. When the main thread is entangled with each other, the overlock sewing of # 504 shown in FIG. 10 or # 505 shown in FIG.

3.2 Overlock stitch # 509 with 3 needles.

As shown in FIGS. 7 and 8, by rotating the eccentric pin 27,
The holding member 24 is brought into contact with the tip side inner edge 28a of the positioning means 28, and the tip of the horn 23 is moved to the tip side passage 16b of the upper looper 7.
A key looper formed by projecting a predetermined length from the opening of the upper looper 7 and taking a working position by the horn 23,
29, and the two needles A and B are fitted in the first needle accommodating hole 36 in a parallel state as shown in FIG.
Overlock stitching of the main thread is performed.

The stitch # 509 is formed by entanglement of the needle threads NT1 and NT2 passed through the two needles A and B, respectively, and the lower looper thread LT2 passed through the thread hole 6a of the lower looper 5.

4.1 Overlock stitches # 50K2 and # 503 of two needles.

As shown in FIGS. 13 and 14, one of the needles A or B attached to the first needle accommodation hole 36, the lower looper 6, and the key looper
In cooperation with 29, the overlock stitching of the single needle and two threads is executed.

That is, the two yarns of the needle thread NT1 or NT2 passed through the thread hole of the needle A or B and the lower looper thread LT2 passed through the thread hole 6a of the lower looper 6 are entangled, and the # of a single needle two thread 502 (Fig. 13) or # 5
Overlock stitching of 03 (Fig. 14) is performed.

5.2 Overlock stitch # 516 (# 401 + # 504) of 5 needles.

As shown in FIG. 15, the needle A attached to the first needle holding hole 36 by operating the first needle set screw 38 and the needle A attached to the second needle holding hole 37 by operating the second needle set screw 40. With the needle C, the overlock stitching of the two-needle five-thread is executed.

The stitch # 516 is passed through the needle threads NT1, NT3 passed through the two needles A and C, respectively, the upper looper thread LT1 passed through the thread hole 17 of the upper looper 7, and the thread hole 6a of the lower looper 6. The lower looper thread LT2 and the chain looper thread LT3 passed through the thread hole 5a of the chain looper 5 are entangled and formed.

6.2 Overlock stitch # 515 (# 401 + # 503) of 4 needles.

As shown in FIGS. 7 and 8, by rotating the eccentric pin 27,
The holding member 24 is brought into contact with the tip side inner edge 28a of the positioning means 28, and the tip of the horn 23 is moved to the tip side passage 16b of the upper looper 7.
The horn 23 is made to protrude a predetermined length from the opening of the upper looper 7 to take the action position, and is switched to a key looper 29 formed by the back side of the tip portion of the blade portion 15 of the upper looper 7, and the first needle is accommodated as shown in FIG. Needle A in hole 36, needle C attached in second needle accommodation hole 37, chain looper 5, lower looper 6, and key looper 29
Cooperate to perform the overlock stitching of the two-needle and four-thread.

That is, the stitch # 515 is made of NT1, NT3 passed through the two needles A and C and the chain looper thread LT3 passed through the thread hole 5a of the chain looper 5, and the thread hole 6a of the lower looper 6, respectively.
The lower looper thread LT2 passed through is entangled and formed.

7.1 double needle double stitch # 401.

As shown in FIG. 17, the needle C of the second needle accommodating hole 37 and the chain looper 5 cooperate to perform double chain stitching.

That is, the needle thread NT3 passed through the needle C and the chain looper 5
The chain looper thread LT3 passed through the thread hole 5a is formed by being entangled.

〔The invention's effect〕

As can be understood from the above description, according to the present invention, an overlock sewing machine capable of performing eight types of overlock sewing and one type of double chain stitch with one unit is provided. The overlocking of the stitch # 514 which requires the arrangement of two needles perpendicular to the direction is also used as the overlocking of the stitch # 516 which also requires the arrangement of the two obliquely crossed needles. As a result, the function of the overlock sewing machine can be greatly expanded.

[Brief description of the drawings]

1 to 17 show an embodiment of the present invention, FIG. 1 is a diagram showing a main part of an overlock sewing machine, FIG. 2 is a diagram showing a needle stopper, and FIG. Fig. 4 is an exploded perspective view of the upper looper, Fig. 5 is a view showing the upper looper without a key looper, and Fig. 6 is a main part of the upper looper without a key looper. , FIG. 7 is a view showing an upper looper forming a key looper, FIG. 8 is a cross-sectional view showing a main part of the upper looper forming a key looper, and FIG. 9 is an overcast of # 514. Explanatory drawing showing sewing, 10th
The figure is an explanatory view showing overcasting of # 504, and FIG. 11 is # 505.
FIG. 12 is an explanatory view showing an overcast stitch of # 509, FIG. 13 is an explanatory view showing an overcast stitch of # 502, and FIG. 14 is an explanatory view showing an overcast stitch of # 503. FIG. 15 is an explanatory view showing overcasting of # 516, and FIG.
The figure is an explanatory view showing the overcasting of # 515, and FIG. 17 is # 401
It is explanatory drawing which shows the double chain stitching. 1: Needle stopper, 1a: recess, 2: needle bar, 3: needle plate, 4: work cloth, 5: chain looper, 5a: thread hole, 6: lower looper, 6a: thread hole, 7: upper looper, 8:
Mounting seat, 9: mounting screw, 10: upper looper mounting rod, 12: lower looper shaft, 13: chain looper shaft, 15: blade, 16: guide passage, 16a: curved portion, 16b: distal passage, 16c: Proximal end passage, 17: thread hole, 23: horn, 29: key looper, 36: first needle receiving hole (needle hole), 37: second needle receiving hole (needle hole), 38: first needle set screw, 39:
Tip, 40: 2nd needle set screw, A, B, C: needle, NT1, NT2, NT3: needle thread, LT1: upper looper thread, LT2: lower looper thread, LT3: chain looper thread.

Claims (1)

(57) [Claims] 1. A needle which has a needle thread and moves up and down, a chain looper which can have a chain looper thread, an upper looper which can have an upper looper thread inserted into a thread hole at a tip end, and a lower looper thread. In an overlock sewing machine in which an overlock sewing machine cooperates with a lower looper which can perform overlock sewing, the upper looper includes a looper switching device capable of switching between a formed state and a non-formed state of a key looper, and the needle includes a needle bar. Attached to the lower end,
Needle holes that can be individually attached so that the two needles are adjacent to each other in a side-by-side state, and the needle holes are slightly eccentric with respect to the needle holes on the front side in the cloth feeding direction of the work cloth and in the direction perpendicular to the cloth feeding direction. A needle stopper having a needle hole to which one needle can be attached is provided. One needle, two thread overlock stitching, 2 types, 1 needle, 3 thread edge overlock stitching, 2 types , 2 needle, 3 thread edge overlock, 1 type, 2 needle, 4 thread edge overlock, 2 types, 2 needle, 5 thread edge overlock, 1 type or 1 needle 2 thread An overlock sewing machine characterized in that it can be used for one of double chain stitching.