JPS6017559B2 - Looper of single chain stitch sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The invention of this application relates to a single-ring all-stitch sewing machine.

In particular, it relates to the structure of the looper of a single chain stitch sewing machine. There are generally two types of sewing methods used with conventional embroidery sewing machines.

One is double-thread lockstitch, and the other is single-thread chainstitch. However, the invention of this application relates to the latter, that is, a single thread ring key stitch sewing machine. A conventional single chain stitch sewing machine will be briefly described below. Attached Figure 1A
is a perspective view with the front plate and side plate removed from the head of the sewing machine, and figure B is a schematic diagram of the structure provided below the sewing machine head at corresponding positions to interlock with each structure in figure A. It is a diagram.

The front surface of the sewing machine head 2 is equipped with a needle holder a, a needle holder support b, a cloth feed and presser foot c (hereinafter simply referred to as cloth feed), and a cloth feed moving rod d.

The needle twill a is provided with a needle birch support 8 and a crochet hook 10 detachably fixed to the end thereof (FIG. 10), and by the operation of a needle twill driver 12 connected to the upper shaft 4, the needle twill support cylinder b is moved. Works up and down within the company. Another gear 18 which is interlocked with the shaft 4 meshes with the gear 16 provided on the needle twill support section b, and is configured to be rotatable as will be described later. However, it is provided with a nipple 14 at its lower end. An annular presser 20 is provided at the lower end of the cloth feed c, and a cloth feed c is provided at the upper end in conjunction with the upper shaft 4.
A section 22 is provided to give vertical movement to the section 22, and a part of the section 22 is connected to a cloth feeding moving ring 30, which will be described later.

The cloth feeding movement rod d is composed of an actuating rod 28 that moves up and down within the cylindrical body via a spring 26 in conjunction with the cylindrical body 24 and the upper shaft 4, and the actuating rod 28 moves up and down to move up and down. The leg part 29 moves up and down by moving the moving ring 30 up and down by touching and separating from the lower surface of the moving ring 30 that is aligned with the supporting cylinder b, and through the tongue-like member 32 attached to the outside of the needle birch supporting cylinder, The movable ring 30 moves in the lateral direction, and the cloth feed c connected to the three movable rings also moves in the same direction. Therefore, the cloth feed c performs a so-called four-movement feeding action by the combination of the vertical movement of the member 22 and the horizontal movement of the cloth feed c. However, the normal feeding direction is the tongue-shaped portion 3.
This is the direction facing 2. That is, the tongue 3 in FIG.
2, the feeding action is performed from the front to the rear. Next, to explain the configuration shown in FIG.
The looper shaft 42 rotates through a and 36b,
This rotational movement is transmitted to the gears 18, 16 via the third gear groups 38a, 38b and the fourth gear groups 40a, 40b, resulting in a rotational movement of the needle bar support b.

At the same time, the rotational movement of the looper shaft 42 causes the rotation of the looper gear 44 provided at the end of the looper.
The looper 46 meshing with the looper 4 also rotates. The above is an outline of the structure of the single chainstitch sewing machine as a subsidiary example, and although it is not directly related to the present invention, it is necessary to explain its operation etc. in relation to the present invention. Next, the configuration and operation of the looper, which are directly related to the present invention, will be explained.

Conventionally used loopers are illustrated in FIGS. 2, 3, and 4. A through hole 48 through which the sewing thread passes is bored in the direction of the central axis of the looper 46, a spiral notch 52 is provided in the head 5, and a longitudinal groove is provided near the end of the spiral notch in the direction of the ball of the looper 46. 54 is drilled. A helical gear 58 is formed on the body portion 56, and the lower end of the Tsukioka portion extends to form a leg portion 59. The throat plate 6 has a circular shape, and around its center point are provided a plurality of needle holes 62 and the same number of thread holes 64 adjacent to these holes (FIG. 5).

When supplying sewing thread to the looper 46, first insert a thread pulling tool 68 having a hook portion 66 at its tip into the through hole 48 of the looper 46 located below the thread hole 64 of the needle plate 60. , the sewing thread 72 wound around the thread winding tool 70 is attached to the hook portion 6.
6, pull up the thread puller 68 above the looper 46, and pull it out from the thread hole 64 of the throat plate.

Next, when the handle date is rotated, the first gear group 34a, 34
b. Since the looper shaft 42 rotates together with the looper gear 44 via the second gear group 36a, 36b (in this case, the looper shaft 42 only rotates and does not make horizontal reciprocating motion), the louver 46 that meshes with it rotates in a predetermined direction. As the sewing thread 72 rotates, the thread 72 moves along the spiral cutout 52 of the looper and becomes hooked in the longitudinal groove 54. Once the sewing thread 72 is stuck in the groove 54, the needle a with the crochet hook 10 attached thereto is moved up and down, and the sewing thread 72 is hooked on the tip of the crochet hook and pulled up to the upper surface of the fabric W, thus completing the preparation. Next, when the crochet needle 10 and the sewing thread 72 pass through the fabric W and move up and down as the upper shaft 4 rotates, the looper 46 adjusts the timing to the operation of the needle a to solve problems with the sewing thread 72. Since it makes a half-rotation reciprocating motion, the crochet needle 10' threads the sewing thread 72 at regular intervals. The above-mentioned half-rotation movement of the looper 46 is possible by reciprocating the looper shaft 42 in the direction of the arrow (FIG. I) and rotating the looper gear 44 meshed therewith.
Although not shown, the looper shaft 42 is connected to the upper shaft 4 of the head, and as the upper shaft 4 rotates by operating the balance wheel 5, a biasing device 74 provided at the end of the shaft is biased. The motion is transmitted to the looper shaft 42 via the vertical shaft 9 and converted into a reciprocating motion. Further, the vertical shaft 9 and the looper shaft 42 are connected to each other by a detachable coupling mechanism, as shown in the drawing. In addition, in order to adjust the feeding direction of the cloth feed c, the needle birch support cylinder b is rotated through a plurality of groups of gears that move by operating the handle, and the tongue-like part attached to this is rotated. As described above, this is possible by changing the position of 32. As mentioned above, in the looper of the conventional single chain stitch sewing machine, at the beginning of sewing, the sewing thread is first pulled up and held by the puller, and then the handle is operated to allow the sewing thread to hang in the vertical groove of the looper. The looper must be rotated until the looper is rotated, which is extremely complicated and inefficient. Therefore, this has been a major hindrance to automating the sewing process for this type of embroidery sewing machine.
Therefore, the invention of the present application has been devised to simplify the complicated operations of the conventional example and contribute to improving efficiency, and also to be useful for automatic sewing of this kind of sewing machine.

Regarding one embodiment of the looper according to the invention of the present application,
This will be explained based on the attached FIGS. 7, 8, and 9.

The structure of the looper 78 according to the present invention is the same as that of the conventional example, in that the body part 80 is formed with a helical gear, the legs 82 are extended, and a through hole 84 is bored in the center. A semicircular annular groove or notch 92 is provided on one side of the head 90 to fit the central through hole 84, and a hole 96 is provided in one side wall of the annular groove or notch to fit the top surface 91 of the head 90. The hole 96 and the central through hole 84 are indirectly communicated with each other. In this embodiment, a semicircular annular groove or notch 94 is provided between the hole 96 and the central through hole 84, but in another embodiment, the hole 96 may be directly connected to the central through hole 84. It may be perforated so that it can be done.

When setting a sewing thread using the looper of the present invention, first insert the thread puller 68 downward into the hole 96 from above, lower it through the semicircular annular groove 92 into the central through hole 84, and then The sewing thread 72 is removed by the hook 66 of the thread puller below the sewing thread 82.
After hooking the sewing thread 72, the semicircular groove 92
, the sewing thread 72 is drawn out from the upper surface 91 of the head 90 through the hole 96.
is set in a predetermined position, and immediately thereafter, the crochet hook 10 of the needle twill a is moved up and down through the needle hole 64 and into the through hole 48,
The sewing thread 72 is pulled up to the upper surface of the fabric W, and sewing is then performed as described in the conventional example.

Therefore, like the conventional looper 46, it is possible to set the sewing thread by first pulling up the sewing thread 72 through the central through hole 48, then rotating the looper 46 and hooking the sewing thread 72 into the head longitudinal groove 54. Compared to the method that requires two-stage operation, the sewing thread can be set very vertically and quickly simply by the pulling operation of the thread pulling tool, which contributes to improving efficiency, and also makes it possible to easily set the sewing thread in the annular groove or in the case of defects. If it is provided in the section, the operation of the thread pulling tool 68 can be easily monitored, so that the work can be carried out easily and accurately.

[Brief explanation of the drawing]

FIG. 1A is a perspective view of the single chainstitch sewing machine with the front plate and side plate removed. FIG. 1B is a schematic diagram of a looper drive and needle twill support tube rotation mechanism provided corresponding to FIG. 1A. 2 and 3 are enlarged side views of a conventional looper. FIG. 4 is a plan view of FIG. 3.
FIG. 5 is an enlarged plan view of the throat plate. FIG. 6 is an enlarged side view showing a state in which the looper and the looper gear according to the present invention are engaged. 7th
The figure is an enlarged side view of the looper according to the present invention. FIG. 8 is a longitudinal sectional view of FIG. 7. FIG. 9 is a plan view of FIG. 7. FIG. 10 is an enlarged side view of the needle a. a is a needle bar, day is a handle, 66 is a hook portion, 68 is a thread puller, 70 is a thread winder, 72 is a sewing thread,
78 is a looper, 80 is a body, 82 is a leg, 84 is a through hole, 90 is a head, 92 is an annular register, 94 is a side wall, and 96 is a hole.
Figure 1 Figure 3 Figure 4 Figure 2 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10

Claims (1)

[Claims] 1. A notch or groove is provided on one side of the looper head with a through hole in the center, and from the top surface of the head, through the notch or groove,
A looper for a single chainstitch sewing machine provided with a hole communicating with the central through hole.