JPS6111628B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present application relates to a sewing machine that simultaneously performs hem stitching and blind stitching, and more specifically, in a scoop stitch sewing machine, two loopers that reciprocate along the sewing edge of the fabric are provided, and three This invention relates to a sewing machine that can simultaneously perform hem stitching and blind stitching using real thread.

Conventionally, in order to sew easily frayed fabrics with existing scoop stitch sewing machines, a two-step process of over-seaming and then hem stitching was indispensable, but sewing the same hem twice was cumbersome and The finish was inferior.

The present application has been developed in view of these circumstances, and has been developed by adding a separate new looper to the existing scooping needle and looper, and devising a way to perform hem stitching and blind stitching at the same time, which greatly improves the sewing of clothes. The aim is to improve efficiency and save labor.

The sewing machine according to the present application will be explained in detail below.
The configuration is as follows: In a scoop stitch sewing machine, a needle thread 3A is passed through the fabric 2 together with a scoop needle 3, and a first looper thread 11A is passed through the needle thread 3A together with a first looper 11.
As the scooping needle 3 retracts, the second looper 21 is moved along with the second looper thread 21A, and the first looper thread 1
The needle thread 3 is passed through the loop 11B of the second looper 21 and hooked onto the thread, and as the first looper 11 retracts, the needle thread 3 is attached to the thread 21A of the second looper 21 along with the scooping needle 3.
A, the second looper 21 retracts and comes off the loop 11B of the first looper thread, and the operation of passing the scooping needle 3 through the fabric 2 together with the needle thread 3A is repeated. It is characterized in that the second looper 21 is provided so as to draw a substantially saddle-shaped loop-shaped trajectory.

An example of such a sewing machine is shown in its entirety in FIGS. 1 to 3. However, the swinging mechanisms of the first looper and the second looper will be further explained below along with other embodiments.

First, regarding the swinging mechanism of the first looper, its configuration is such that an eccentric rotating body, a crank, a universal joint, etc. is provided on the drive shaft 10, and this and the looper mounting portion 12 are connected by an appropriate link mechanism to mount the swing mechanism. The section 12 is swung, and a hook-shaped first looper 11 is provided at the tip thereof, so that the looper 11 is reciprocated in an arc shape.

This will be explained in detail by illustrating a more specific example.

4, an eccentric rotating plate 13 fixed to a drive shaft 10 is rotatably fitted to one end of an arm 14, and the other end of the arm 14 is attached to a shaft 15 which is pivotally connected to a machine frame 1. Lever 16a, 1 fixed at both ends
6b is pivoted to one lever 16a, and the other lever 16b
is connected by a link 17 to a lever 19 fixed to one end of a shaft 18 pivotally connected to the machine frame 1, and a looper attachment part 12 is fixed to the other end of the shaft 18.

Further, in the one shown in FIG. 5, a shaft 20 connected to the drive shaft 10 in a crank shape and a lever 19 fixed to one end of a shaft 18 pivotally connected to the machine frame 1 are connected by a link 17'. The looper mounting portion 12 is fixed to the other end.

Next, regarding the looper mounting portion 12 in the above, as already shown in FIGS. 1 to 5, and as shown separately in FIG. 1st looper 1
1 is installed.

As another embodiment of the looper mounting portion 12, as shown in FIG.
There is a configuration in which a rod 12C, which is swingably fitted into a guide sleeve 12B, is pivotally supported, and the first looper 11 is attached to the tip of the rod 12C.

The swinging mechanism of the first looper is not limited to the above, and in addition, as shown in FIG.
A rod 12C is slidably fitted into a guide sleeve 12B having a support pin 12b pivotally connected to the shaft machine frame 1 via a link 17' which is swingably provided on the shaft machine frame 1 connected to the drive shaft 10 in a crank shape. In some cases, the rod 12C of the looper mounting portion 12 is connected to the rod 12C.

In the swinging mechanism of the first looper described above as an example, the operation of the first looper is slightly different depending on the configuration of the looper mounting portion 12. In general, it is more advantageous to allow the tip of the first looper to spring up at the beginning and end of the swing in order to hook the thread with the second looper, but this makes the structure more complicated, so the configuration of the attachment part 12 is It may be selected as appropriate depending on the purpose.

Next, to explain the swinging mechanism of the second looper, its configuration is such that the drive shaft 10 is provided with an eccentric rotating plate, a crank, a universal joint, etc.
The second looper 21 is connected to a looper mounting portion 22 provided thereon by an appropriate link mechanism, so that the looper 21 traces a substantially saddle-shaped loop-shaped trajectory.

This will be explained with reference to more specific embodiments shown in FIGS. 8 and 9. Its structure is as follows.

A convex portion 23a is provided diagonally protruding from an eccentric portion of the rotary plate 23 fixed to the drive shaft 10, and one of the convex portion 23a and a cross sleeve 24 is rotatably provided, and the other of the sleeve 24 is attached to the bifurcated lever 25. A rod 26 is fitted and fixed onto the suspended pin 25a, and a rod 26 is connected to the bifurcated rod 25, and a spherical portion 26a bulging above the rod 26 is provided on a lever 27 whose one end is pivotally connected to the machine frame 1. The rod 26 is fitted into and engaged with a bearing ring 27a that allows the rod 26 to freely rotate and rotate, and the second looper 21 is attached to the tip of the rod 26.

In the illustrated embodiment, whether the swinging mechanism of the second looper is shown in FIG. 8 or 9 depends on the drive shaft 10.
It depends on the direction of rotation.

The configuration of the sewing machine according to the present application has been described in detail above, and the operations of the scoop needle, first looper, and second looper when actually sewing with this sewing machine are shown in FIG. 12.

The sewing procedure using three threads is as follows.

First, the needle thread 3A is passed through the fabric 2 together with the scooping needle 3 (FIG. 12A). Next, the first looper thread 11A is inserted into the needle thread 3A together with the first looper 11 (FIG. 12B). Next, the scooping needle 3 is retracted and the second looper 21 is passed through the loop 11B of the first looper thread 11A together with the second looper thread 21A and hooked onto the thread 11A. (Figure 12 c and d). Next, as the first looper 11 is retracted, the needle thread 3A together with the scooping needle 3 is inserted into the thread 21A of the second looper 21 (FIG. 12E). Next, the second looper 21 retracts and loops 11 of the first looper yarn.
As soon as it is removed from B, the scooping needle 3 is made to pass through the fabric 2 together with the needle thread 3A (FIG. 12F). If the above operations are repeated, a sewing line as shown in FIG. 13 will be obtained, which will be sewn with hem stitches and hem stitches. In the figure, 4 is a throat plate, 5 is a needle guide, 6 is a stitch stabilizing piece, 7 is an upper presser foot, and 8 is a ruler. Also, regarding the trajectory drawn by the second looper 21, since the rod 26 twists and swings with the bearing ring 27a as a fulcrum, it exhibits a loop like the periphery of a saddle where both ends spring up.
In the illustrated embodiment, it revolves inwardly when viewed from the top.
At this time, the right end of the saddle acts to hook the line.

The sewing using the sewing machine according to the present application has been described above.
Needless to say, sewing can be performed not only when sewing A, but also when two or more pieces of fabric are overlapped. Furthermore, there is no particular distinction as to the type of fabric, and it is possible to sew everything from underwear to outerwear in the same way. However, the action of scooping out the base material can be performed for each predetermined stitch by adjusting the cloth lifting mechanism 9. The illustrated sewing shows an example in which stitches are skipped one by one.

In the sewing machine of the present invention, the front and back sides of the stitches can be reversed by operating the scoop needle, first looper, and second looper in the opposite manner to the illustrated embodiment.

The structure and operation of the sewing machine according to the present application have been described in detail above, and the following unique effects are brought about.

According to the sewing machine of the present invention, overlocking and hem stitching can be performed at the same time, which greatly simplifies, saves labor, and improves efficiency of the sewing process.

In addition, the finished product is beautiful because the blind stitches do not overlap with the hem stitches as in the past, and since the stitches are sewn with two or more threads, there is no chance of one of the threads breaking. However, the fraying will stay at the seams and will not spread.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a front view of the sewing machine body, FIG. 2 is a side view,
3 is a bottom view, FIG. 4 is a front view of the swing mechanism of the first looper, FIG. 5 is a front view showing another embodiment, and FIG. A front view of the looper mounting part in the first looper swing mechanism, FIG. 6B is a front view showing another embodiment of the looper mounting part, and FIG. 7 is a third implementation of the first looper swing mechanism A front view showing an example, FIG. 8 is a front view of the second looper swing mechanism, FIGS. 9 A and B are front views and side views showing another embodiment, and FIGS. Diagram showing the sewing order in the case of
FIG. 1 is a diagram showing similarly sewn seams. 1... Machine frame, 2... Fabric, 3... Scooping needle, 10
... Drive shaft, 11 ... First looper, 12 ... Looper mounting part, 21 ... Second looper, 22 ...
Looper mounting part.

Claims (1)

[Claims] 1 In a scoop stitch sewing machine, pass the needle thread 3A through the fabric 2 together with the scoop needle 3, insert the first looper thread 11A together with the first looper 11 through the needle thread 3A, and withdraw the scoop needle 3. As the second looper 2
1 and the second looper thread 21A are passed through the loop 11B of the first looper thread 11A and hooked onto the thread. 3, the needle thread 3A is inserted, and as the second looper 21 retracts and comes off the loop 11B of the first looper thread, the scooping needle 3 is passed through the fabric 2 together with the needle thread 3A. Repeat the same action as the second looper 21.
A sewing machine that simultaneously performs hem stitching and hem stitching, and is characterized in that it is provided so as to draw a substantially saddle-shaped loop-shaped trajectory.