JPS5938346B2 - Thread guide device for embroidery sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sewing machine for embroidering cloth.

Conventionally, this type of sewing machine is based on chain stitching as shown in Figure 1. A hook needle is inserted into the fabric, the sewing thread is scooped up from the looper, and the upper thread and core thread (the core thread is always attached to the needle bar at the hook position). It is penetrating and hanging down.

) After winding the thread (embroidery thread) around the thread, only the crochet hook is inserted into the fabric, and the thread is scooped up from the looper using the hook.

Therefore, the sewing thread is a single thread knitted together (called a chain stitch).
Because of this, if a part of the sewing machine is torn due to washing, etc., it will all come undone and cannot be repaired.Also, since the needle is a hook, there is a risk of scooping up the threads of the fabric when scooping up the sewing thread. It has the disadvantage that non-defective products are often produced.

The present invention has been researched to eliminate the above-mentioned defects in embroidery products or defects in the production of defective products during the sewing process, and is based on lockstitching using a sewing machine using upper thread and bobbin thread.
In this way, the winding thread (embroidery thread) and core thread are sewn onto the fabric, and even if one part of the bobbin thread or upper thread breaks, there is no chance of infection, thereby ensuring the durability of the product. The purpose of the present invention is to perform embroidery sewing with a high yield by allowing embroidery to be embroidered at a predetermined position.

The present invention will be described in detail with reference to the illustrated embodiment. In a sewing machine 6, sewing is performed using a bobbin thread 2 fed out from a hook 1 and an upper thread 5 passed through a threading hole 4 at the tip of the sewing machine needle 3 and fed out. An outer cylindrical body 8 that moves up and down in conjunction with the vertical movement of the needle bar 7 is fitted into the rod 7 so as to be vertically movable, and a nipple 9 that tapers downward is screwed into the lower end of the outer cylindrical body 8. 1
0, and the sewing machine needle 3 fixed to the needle bar 7 can be freely inserted through the insertion opening 11 at the tip of the nipple 9 (details will be described later).

A needle thread insertion hole 14 and a core thread insertion hole 1 are formed in the side walls of the frame 12 and the outer cylinder 8 from the upper outer position toward the lower inner space 13.
5 is provided through the needle thread insertion hole 14 , and the needle thread 5 unwound from a bobbin (not shown) is inserted through the needle thread insertion hole 14 .

A core thread 16 drawn out from a bobbin (not shown) is inserted through the core thread insertion hole 15 , and the core thread 16 is allowed to hang down from the insertion opening 11 of the nipple 9 .

A rotary tongue 17 is rotatably fitted in the outer cylinder 8, and the rotary ring 17 is rotatably supported by a semicircular support portion 19 of a support rod 18 fixed to the frame 12. A driving tooth 20 is carved in the upper part of this rotating ring 17, a mounting rod 21 is fixed to the outer periphery of the rotating ring 17 at the lower position of the driving tooth 20, and a winding thread is attached to the mounting shaft 24 of the mounting rod 21. The bobbin 22 is pivotally mounted via a brake spring 23, and the mounting shaft 24 into which the thread bobbin 22 is fitted is aligned with the axis a of the needle bar 7.
The angle b at which the mounting shaft 24 is inclined downwardly toward the outside
(preferably about 45 to 75 degrees) and hold the bobbin 2.
The thread 25 of the bobbin 22 is prevented from unraveling inadvertently due to centrifugal force when the entire bobbin 2 rotates.

The winding thread 25 of the winding thread bobbin 22 is passed through a through hole 27 provided at the tip of a guide rod 26 rotatably attached to the rotating ring 17.
and is guided to the tip of the nipple 9.

A stop bar 28 is provided on the side of the guide rod 26 (at a position opposite to the rotating direction of the rotary ring 17).

In the figure, 29 and 29' are peepholes.

30 is a reinforcing cylinder for reducing wear of the outer cylinder body 8.

In such an embroidery sewing machine, the auxiliary nipple 31 is fitted inside the nipple 9, and the thin push tube 32 of the auxiliary nipple 31 can be freely retracted and retracted from the insertion opening 11 of the nipple 9. A spring 33 is inserted in the push tube 3 to constantly press the auxiliary nipple 31 downward.
2 protrudes from the insertion opening 11.

The sewing machine needle 3 can be freely inserted into the push tube 32, and the upper thread 5 and the core thread 16 are also inserted therethrough.

34 is a guide hole provided in the side wall of the auxiliary nipple 31, into which a screw 10 is fitted to prevent rotation.

Reference numerals 35 and 35' designate auxiliary peepholes that are bored to communicate with the peephole of the nipple 9.

The present invention is embodied as described above, and its operation will be explained. When the fabric C to be embroidered is placed on the table T and the sewing machine 6 is operated, the outer cylinder body 8 and the nipple 9,
Then, the needle bar 7 and the needle 3 simultaneously start descending toward the table. First, the tip of the push tube 32 of the auxiliary nipple 31 descends from pressing the fabric C, and when the tip of the nipple 9 presses against the fabric, the needle 3 and the needle As the rod 7 continues to descend, the needle 3 passes through the fabric C and the table T, and the needle thread 5 becomes entangled with the bobbin thread 2 of the hook 1.

Next, the needle 3 and the needle bar 7 rise, and when the tip of the needle 3 leaves the fabric C, the nipple 9 and the outer cylinder 8 rise.

At this time, the tip of the auxiliary nipple 31 is pressed by the spring 33 and presses the cloth C.

Next, the drive teeth 20 of the rotary ring 17 are driven by a drive source (not shown), causing the rotary ring 17 to rotate once and the winding bobbin 22 to be rotated as shown by the arrow.

As a result, the winding thread 25 is wound around the push tube 32, the core thread 16, and the upper thread 5 or the bobbin thread 2, and then the tip of the push tube 32 is separated from the fabric C by the rise of the outer cylinder 8 and the nipple 9.
The fabric C moves.

When this operation is completed, the operation returns to the initial operation order and repeats the operation.

The embroidery body thus sewn has a structure in which the core thread 16 and the needle thread 5 are wound around the core thread 16 and the needle thread 5, and the needle thread 5 is entangled with the bobbin thread 2, as shown in FIG.

) In the present invention, an outer cylindrical body that moves up and down in conjunction with the needle bar is fitted to the needle bar of a sewing machine that sews with a lower thread and an upper thread in a diagonal manner, so that the lower end of the outer cylindrical body can move up and down. A lockstitch sewing machine needle fixed to the needle bar can be freely inserted into the insertion hole of the nipple, and a lockstitch sewing machine needle fixed to the needle bar can be inserted freely into the insertion hole of the nipple. A needle thread insertion hole and a core thread insertion hole are formed through the outer cylinder body, and a rotary ring is rotatably fitted to the outer cylinder body, and the rotary ring is rotatably supported by a support rod. carving driving teeth; 1;
On the outer periphery of the rotating ring at the lower position of the drive tooth, there is provided a thread bobbin and a guide rod for guiding the thread of the thread bobbin to the tip of the nipple.In a sewing machine, an auxiliary nipple that can move up and down is fitted into the nipple. The presser tube of the auxiliary nipple can be freely moved in and out from the nipple insertion opening, and a spring is interposed between the auxiliary nipple and the outer cylinder to constantly press the auxiliary nipple downward, and the sewing machine needle, core thread, and needle thread are Since it can be freely inserted into the presser foot tube, the winding thread (embroidery thread) is attached to the lock stitch of the upper thread and bobbin thread; since it is sewn to the fabric, part of the upper thread or bobbin thread may be lost due to washing, etc. Even if it is cut carelessly, it will only partially unravel and can be repaired without causing infection.

Furthermore, since a lockstitch sewing machine needle is used, there is no risk of the thread of the fabric C getting caught during the sewing process, so the fabric is not damaged and no defective products are produced.

Furthermore, when the rotating ring rotates and the winding thread is wound around the needle thread and the core thread, the booster tube, which the winding thread is wound around the push tube of the auxiliary nipple, rises and the wound thread is dislodged. Since no tension is applied to the needle thread or the core thread when the thread is wound, the fabric, etc., does not shift and can be embroidered securely in a predetermined position.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional explanatory diagram of an embroidery object showing a conventional embroidery structure;
Fig. 2 is a cross-sectional view of an embroidered object sewn by the sewing machine of the present invention;
FIG. 3 is a sectional view of the embroidery sewing machine according to the present invention, and FIG. 4 is a longitudinal sectional side view of the nipple and the auxiliary nipple. 2 is a lower thread, 3 is a sewing machine needle, 5 is an upper thread, 7 is a needle bar, 8 is an outer cylinder, 9 is a nipple, 11 is an insertion port, 13 is a lower inner space, 14 is an upper thread insertion hole, 15 is a Core yarn insertion hole, 16 core yarn, 17 rotation ring, 20 drive tooth, 22 winding bobbin, 25 winding yarn, 26 guide rod, 31 auxiliary nipple, 3
2 is a push tube, 33 is a spring, and C is fabric.

Claims (1)

[Claims] 1 The needle bar of a sewing machine that sews with the bobbin thread and upper thread has
An outer cylindrical body that moves up and down in conjunction with the needle bar is fitted so as to be able to move up and down, a nipple that tapers downward is fixed to the lower end of the outer cylindrical body, and the nipple is fixed to the needle bar in the insertion opening of the nipple. The lockstitch sewing machine needle can be inserted freely, and the outer cylinder has an upper thread insertion hole and a core thread insertion hole extending from the upper outer position to the lower inner space.
A rotary ring is rotatably fitted into the outer cylindrical body, and the rotary ring is rotatably supported by a support rod. Driving teeth are carved on the upper outer periphery of the rotary ring, and the rotary ring at the lower position of the first driving tooth. In an embroidery sewing machine, which is equipped with a winding thread bobbin and a guide rod for guiding the winding thread of the winding thread bobbin to the tip of the nipple, an auxiliary nipple that can be moved up and down is fitted into the nipple to create a nipple insertion opening. The presser tube of the auxiliary nipple can be moved in and out, and a spring is interposed between the auxiliary nipple and the outer cylindrical body to constantly press the auxiliary nipple downward.
A thread guide device for embroidery sewing machines that allows the core thread and upper thread to be inserted freely into the presser foot tube.