JP2587430Y2 - Sewing machine with multiple overlocks - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overlock sewing machine capable of forming a plurality of overlock stitches. [0002] Among conventional overlock sewing machines capable of overlock sewing, a one-needle, three-thread sewing machine has a JIS stitch type 50.
No. 4 or 505 is sewn, and JIS stitch type 514 or 506 is sewn on a two-needle, four-thread sewing machine. For the former one-needle, three-thread sewing machine, JIS stitch type 5 of one-needle, two-thread may be used depending on the application.
02 or 503, and the latter two-needle, four-thread sewing machine is JIS stitch type 509 or 521 of two-needle, three-thread.
Is possible. However, to sew each with these applications, replace the upper looper, which cooperates with the needle, with a key looper. Alternatively, the driving timing of the upper looper is changed. [0003] These require adjustment of the phase alignment for the intersection of the lower looper and the upper looper, and the structure becomes large and complicated, so that the threading of the looper is performed. Various obstacles, such as difficulty in making
The present invention makes it possible to perform overlock sewing of another stitch configuration in which the number of threads is reduced by attaching an accessory having a simple structure to the upper looper shaft when used in an overlock sewing machine. According to the present invention, there is provided a drive shaft rotatably supported by a sewing machine frame, a needle bar and a needle which can be moved up and down in conjunction with the rotation of the drive shaft, and the drive shaft. A lower looper that is reciprocally oscillated in conjunction with the rotation of the shaft and intersects with the needle in a timed manner, and which is reciprocally oscillated in synchronization with the rotation of the drive shaft and is timed with the lower looper In an edge overlock sewing machine provided with an upper looper that is crossed in such a manner, an auxiliary looper pedestal made of a thin plate elastic material is fixed near an axial end of an upper looper shaft for fixing the upper looper,
An auxiliary looper base for supporting the auxiliary looper is detachably mounted on the auxiliary looper base receiver, and the end of the auxiliary looper is locked and positioned and fixed to the thread hole formed in the upper looper. In addition to the normal overlock sewing, the overlock sewing with less number of threads than the normal overlock sewing is possible.Since the structure of the device is simple, it does not hinder other work. Also, it is characterized in that the attachment / detachment operation is easy. In the present invention, an auxiliary looper support is provided at the end of the upper looper shaft in the overcast sewing machine, and the auxiliary looper supported by the auxiliary looper support is mounted on the auxiliary looper support during use. The end of the auxiliary looper is fixed to the upper looper shaft in the thread hole of the upper looper and positioned and fixed, thereby enabling the overlock sewing with a reduced number of threads. The structure of an embodiment of the present invention will be described below with reference to the drawings. The sewing machine frame 1 is composed of an upper arm machine frame 2 and a lower bed machine frame 3, and the arm machine frame 2 supports a needle bar (not shown) that is reciprocated in the up-down direction. A needle (not shown) is fixed to the tip of the needle bar. A drive shaft 4 is rotatably supported on the bed machine frame 3, and an upper looper 5 that reciprocates and swings in conjunction with the rotation of the drive shaft is provided. An upper looper shaft 6 for fixing the upper looper is connected to a connecting rod 8 connected to an eccentric cam 7 fixed to the drive shaft 4.
The upper looper 5 fixed to the vicinity of the tip of the upper looper shaft is reciprocated so as to intersect with the needle at the same time. It is made to move. The lower looper rod 11 to which the lower looper 10 is fixed is reciprocally oscillated through an eccentric cam 12 fixed to the drive shaft 4 and a connecting rod 13 connected to the eccentric cam. At the end of the upper looper shaft 6 above the upper looper 5, an auxiliary looper support 14 made of an elastic material is provided. As shown in FIG. 3, the auxiliary looper support has a substantially d-shape when viewed from the side, and a side surface 15 is brought into close contact with a cut plane 16 formed on a side surface of the upper looper shaft 6 and an upper surface 17 is formed on the upper looper shaft 6. Is fixed to the end face of the base with a fastening screw 18. As shown in FIG. 7, the auxiliary looper 19 is bent in a mountain shape substantially from the center, and one end 20 has a twisted U shape and the other end 21 has a long U shape. The auxiliary looper 19 is attached to the auxiliary looper base 22 by fitting the longitudinal U-shaped portion of the other end 21 into auxiliary looper insertion holes 23 and 24 formed at two places of the auxiliary looper base 22. A U-shaped groove 25 is formed in the auxiliary looper base on the side opposite to the side where the insertion holes 23 and 24 of the auxiliary looper 19 are formed.
The U-shaped groove is attached to an arc portion on the back side of the cut plane 16 of the upper looper shaft 6, and the U-shaped portion of the other end 21 of the auxiliary looper 19 is substantially perpendicular to the axis of the upper looper shaft. (See FIG. 2), the bent portion 26 formed on the opposite side of the auxiliary looper support 14 is pressed against the U-shape of the other end, and the movement of the auxiliary looper 19 is suppressed. Further, the tip portion 27 of the U-shaped torsion of one end 20 of the auxiliary looper 19 is bent at a substantially right angle, and is engaged with the thread hole 28 of the upper looper 5 when mounted on the upper looper shaft 6 to determine the position of the auxiliary looper 19. Let it.
A finger hooking operation unit 29 is extended from an end of the opposite side of the auxiliary looper support 14. The present invention has the above-mentioned structure. In the case of normal overcast sewing, the upper looper 5, the needle and the lower looper 10 are fixed with the auxiliary looper base support 14 fixed to the tip of the upper looper shaft 6. The sewing machine is operated by passing the thread through each thread hole of
An overlock stitch is formed on the main thread or the two-needle four-thread. In the case of an overlock stitch having one less thread than this, an auxiliary looper base 22 supporting the auxiliary looper 19 is attached to the auxiliary looper base receiver, and the thread is passed through the needle and the lower looper 10 to operate the sewing machine to perform the overlock. Form seams. . The attachment / detachment of the auxiliary looper base 22 to / from the auxiliary looper base support 14 is performed by the operation unit 29 provided near the auxiliary looper base support 14.
Is easily performed by releasing the finger with a finger. Depending on the type of sewing machine, the distance from the axis of the upper looper shaft 6 to the position of the thread hole 28 of the upper looper 5 may differ, but the auxiliary looper 19 moves in the U-shaped longitudinal direction with respect to the auxiliary looper base 22. Since it is mounted as possible, it can be adjusted to correspond to any model. Since the present invention has the above-described structure and operation, when the sewing machine is driven in the normal state of one needle and three threads passing through the thread holes of the needle, the upper looper and the lower looper, J is performed.
IS seam type 504 or 505 can be sewn. The auxiliary looper 1 is attached to the auxiliary looper support 14 provided at the tip of the upper looper shaft 6.
9 is attached, and the tip 27 of the auxiliary looper 19 is locked in the thread hole 28 at the tip of the upper looper 5. The looper is used, and the JIS stitch pattern 502 or 503 can be sewn. According to the present invention, the normal overlock sewing and the overlock sewing having less number of threads than the normal overlock sewing can be sewn by attaching and detaching a device having a simple structure. It is extremely easy to attach and detach the sewing machine, and the auxiliary looper is removed in the normal overlock sewing state, so there are no obstacles around the upper looper and there is no obstacle to threading work and dust removal work. The effect is extremely large.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the present invention. FIG. 1 is an external perspective view of a sewing machine of the present invention. FIG. 2 is a front view of a main part of the present invention before an auxiliary looper is installed. 3 is a side view of the main part shown in FIG. 2, FIG. 4 is a front view of the main part after the auxiliary looper of the present invention is attached, FIG. 5 is a side view of the main part shown in FIG. 4, and FIG. FIG. 7 is an exploded perspective view of a main part of the present invention. DESCRIPTION OF SYMBOLS 1 ... Sewing machine frame 4 ... Drive shaft 5 ... Upper looper 6 ... Upper looper shaft 10 ... Lower looper 14 ... Auxiliary looper stand receiver 19 ... Auxiliary looper 22 ... Auxiliary looper stand 28 ... Thread hole

Claims (1)

(57) [Claims for registering a utility model] A drive shaft rotatably supported by the sewing machine frame, a needle bar and a needle which can be moved up and down in conjunction with the rotation of the drive shaft, and A lower looper that is reciprocally oscillated in conjunction with the needle and is crossed in time with the needle; In an overlock sewing machine having an upper looper, an auxiliary looper support made of a thin plate elastic material is fixed near the shaft end of an upper looper shaft to which the upper looper is fixed, and the auxiliary looper is supported by the auxiliary looper support. A plurality of overlock sewing machines, wherein an auxiliary looper base is detachably mounted and one end of the auxiliary looper is locked in a thread hole formed in the upper looper.