JPH02152494A - Vertical full-rotation shuttle and lock stitch sewing machine - Google Patents

Abstract

PURPOSE:To prevent a thread crossing an upper thread loop from twists and tangle by forming a corresponding shuttle stop part for receiving a shuttle stop member to permit the upper thread to pass through on the inner shuttle opening side opposed to the shuttle stop member. CONSTITUTION:A vertical full-rotation shuttle 20 is constituted of an outer shuttle 23 fixed to a drive shaft 21 by a set screw 22, an inner shuttle 24 received in the outer shuttle 23 and a bobbin case 25 fitted in the inner shuttle 24 to receive a bobbin wound around by a lower thread. The bobbin case 25 is fitted integrally in the inner shuttle 24 not to move angularly relative thereto. When an upper thread moves slidably on the outer periphery of the inner shuttle 24 by the rotation of the outer shuttle 23, large tension is given to the upper thread within the angular range provided with s shuttle stop member 32 and the corresponding shuttle stop part 33 and ranging from a needle drop position to the downstream side of 60-220 deg. in the direction of outer shuttle rotation. Thus, the upper thread can be forcibly passed between the shuttle stop member 32 and the corresponding part and easily surely permit thread crossing without troubles such as tangle and breakage of the upper thread.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a lockstitch sewing machine equipped with a vertical full-rotation flywheel and hook.

&e Prior art No. 61'l is a perspective view of a vertical full rotary hook showing a typical prior art, and FIG. 7 is a perspective view of the inner hook. The vertical full-rotation hook 1 includes an outer hook 4 fixed to a drive shaft 2 by a set screw 3, an inner hook 5 stored in the outer hook 4, and a bobbin on which a bobbin thread is wound. It is composed of a hobbing gear 6 fitted into a rotary hook 5. The outer hook 4 has a tip 8 that allows the needle thread loop to slide along the outer circumferential surface of the inner hook 5. It has a track groove (not shown) formed therein, into which a track 9 provided on the outer peripheral surface of the inner pot 5 is fitted. Further, in the upper part of the open side of the inner hook 5, there is a hook locking recess into which a protrusion 10a of an inner hook rotation stopping member 10 attached to a wooden base of the sewing machine is fitted to prevent rotation of the inner hook 5. 11 is formed.

Problems to be Solved by the Invention According to such a conventional configuration, as shown in FIG.
The critical needle thread 12 of the needle thread loop 7 contacts the contact surface 11a of the hook fastening recess 11 formed in the inner hook 5 when forming a stitch;
The thread fits into the rotary hook recess 11 and passes between the contact surface 11a and the protrusion 10a of the rotary hook member 10 that comes into contact with it. At this time, both abutting surfaces 11a and 10a of the hook locking recess 11 and the hook locking member 10 are in a state of pressure contact with each other as the outer hook 4 rotates, and the thread is passed through the upper thread loop. 7 passes right under the inner hook 5, and just before the upper thread is pulled up by the rise of the needle and thread take-up, the upper thread is almost tension-free, so the upper thread is twisted and becomes a bead. Easy to tangle. Therefore, there was a problem that the sewing performance of the sewing machine was poor.

An object of the present invention is to solve this problem and provide a vertical full-rotation hook with excellent sewing performance and a lockstitch sewing machine equipped with the hook.

Means for Solving the Problems In order to achieve the above object, the present invention provides a rotary hook stopping member that faces from the outside toward the center of the inner hook within an angular range of 60 to 220 degrees from the course position to the downstream side in the rotational direction of the outer hook. On the open side of the inner hook facing the rotary rotary hook, there is a vertical full-rotation hook having a rotary rotary hook corresponding to the rotary rotary hook, which accommodates the rotary rotary hook so that the upper thread can pass therethrough.

Further, the hook locking member of the present invention is synchronized with the rotation of the outer hook,
It is characterized by a motion that facilitates the passage of the upper thread.

Furthermore, the present invention provides a hook stopper member provided from the outside toward the center of the inner hook within an angular range of 60 to 220 degrees downstream in the direction of rotation of the outer hook from the course position; The present invention is a lockstitch sewing machine equipped with a vertical full-rotation hook, which has a hook stop corresponding part formed to accommodate the hook stopper member on the hook open side so that the needle thread can pass therethrough.

Operation When the upper thread moves while sliding on the outer circumferential surface of the inner hook due to the rotation of the outer hook, the needle thread moves downstream from the course position in the direction of rotation of the outer hook, where the hook stopper member and the hook stopper member corresponding part are provided. Within the angular range of 60 to 220 degrees, a large tension is applied to the needle thread. Therefore, the upper thread is forcibly passed between the hook stopper member and its corresponding part, making it possible to pass the thread easily and reliably, and there is no problem of the upper thread becoming tangled or being cut. .

Embodiment FIG. 1 is a perspective view of a vertical full-rotation hook showing an embodiment of the present invention, and FIG. 2 is a perspective view of an inner hook thereof.

As shown in these figures, the vertical full-rotation hook 20 has an outer hook 23 fixed to a drive shaft 21 with a set screw 22.
The inner hook 24 is housed in the outer hook 23, and the bobbin case 25 is fitted into the inner hook 211 and stores a bobbin wound with a bobbin thread. The bobbin case 25 is integrally fitted into the inner hook 24 and is not angularly displaced from each other.

The outer hook 23 has two points that allow the needle thread to slide along the outer circumferential surface of the inner hook 24, and a track groove ( (not shown)
have. On the other hand, the inner hook 24 has an outer hook 23 on its outer peripheral surface.
has a rail 30 that fits into the rail groove so that it can rotate around the rotation axis 11. This rail 30
In this case, the thread facing upstream in the rotational direction of the outer hook 23 is part 3.
1 is formed. In this thread portion 31, the upper thread is on the outer hook 2.
Insert the needle thread in the direction perpendicular to the extending direction of the rail 30 so that it can be pulled by the tip 29 of No. 3 to form a needle thread loop and pass around the inner hook 24. , serves to partially fix the needle thread passage path.

The inner hook 24 that accommodates the bobbin case 25 is attached to a hook stop t'' attached to the base 40 of the sewing machine body.
A hook stop corresponding portion 33 into which this hook stop member 32 is fitted
Rotation is stopped by. According to Saneo, these rotary hook stop members 32 and rotary hook corresponding parts 33 are located about 180 degrees downstream along the rotational direction of the outer hook from the course position of the vertical full-rotation hook 20 shown by the chain line B in FIG. provided at the location. The locking portions 33 are provided on the open front side 24b of the inner hook 24, and are arranged in order from the upstream side in the rotational direction of the outer hook 23, as shown in FIG. 2 and FIG. 3, which is a developed view of the inner hook. , a rotation prevention protrusion 34, a recess 35, and a reverse rotation prevention protrusion 36 are formed.

Further, the rotation prevention protrusion 34 has an upstream side surface 34a, an abutting surface 34b with the hook stopper member 32 formed on the downstream side,
A first inclined surface 34 whose top surface becomes higher as it progresses toward the downstream side.
c and a second inclined surface 34d. The upstream side surface 34
a and the contact surface 34b are each formed within a plane containing the axis 11.

Further, the reversal prevention protrusion 36 is arranged in the recess 35 in order from the upstream side.
The contact surface 36a with the hook stopper member 32, which is an inclined surface continuous to the axis 11, the top surface 36b formed in a plane perpendicular to the axis 11, and the axis ! 1 and a downstream side surface 36c formed in a plane including 1.

As shown in the first (2I), the hook stopper member 32 has a protrusion 37 that fits into the recess 35, and is attached to a base portion 40 attached to a sewing machine base (not shown) via a pin 38. The hook locking member 32 is rotatable around the bottle 38, and when disassembling the inner hook 24, it is necessary to
You can move out from here.

In the above, when forming a stitch by the sewing machine, the sewing machine needle descends in synchronization with the rotation of the outer hook 23 due to the rotation of the drive shaft 21 and moves to the lowest position. At about the same time, the needle thread 26 became loose due to a severe needle condition, and the outer hook 2
It is hooked on the two tips of No. 3 and becomes an upper thread loop 26a. As the two tips move with the rotation of the outer hook 23, they push the needle thread loop 26a open and open the needle side portion 2.
7 comes into contact with the portion 31 by the amount of the rail 30 and is guided to the bottom 24a side of the inner hook 24 and slides thereon. On the other hand, upper thread loop 2
The right side portion 28 of 6a is the open side surface 24b of the inner pot 24.
Then, it moves while slidingly contacting the bobbin case 25 and advances to the hook stop corresponding portion 33, where the needle thread loop 26a passes through the hook stop corresponding portion 33.

During this passage, the needle thread loop 26a is forcibly spread out by the two points of the needle and is forced to the upstream side surface 34 shown in FIG. a to the first inclined surface 34 c and the second inclined surface 3
4d, it advances while tension is gradually applied, passes through the gap between the contact surface 34b of the rotation prevention protrusion 34 and the hook stopper member 32, reaches the recess 35, and returns to the contact surface 36a of the rotation prevention protrusion 36. It moves while being in contact with and under tension. As described above, according to the present invention, as the needle thread 26 is hooked on the two tips and moves in sliding contact with the inner hook 24,
The needle thread 26 is forcibly passed through the gap between the hook stopper member 32 and the hook stop corresponding part 33 due to the large force generated by the rotation of the two tips, so the thread is passed easily and reliably, and the upper thread 26 is not tangled. There is no cutting.

The upper thread 26, which has finished threading, further slides around the outer periphery of the inner hook 24 due to the rising of the needle and the operation of the thread take-up, and then is pulled up, and is sometimes moved to the outer hook 24 as shown in the perspective view of FIG. 2
It is caught on the 1 & ends of the three inner hook pressers 3, but is released as the outer hook 23 rotates, and becomes entangled with the bobbin thread to form a seam.

In addition to the above-mentioned embodiments, the angular range in which the hook locking corresponding portion 33 is provided is from the course position indicated by the chain line B to the downstream l\angle α position in the rotational direction of the outer hook (the chain line C).
〉 to the position of angle β (indicated by a chain line),
α is 60 degrees and β is 220 degrees. When α is smaller than 60 degrees and when β is larger than 220 degrees, the thread passing does not operate as described above, and the movement is within the conventional full-rotation hook, thus solving the problems of the prior art. I can't.

In addition to being provided on the open side surface 24b of the inner hooks 2 and 1 in the embodiment described above, the hook locking corresponding portion 33 may be provided on the sealed side of the bobbin case 25, as shown in FIG. According to this embodiment, the recess 25 Ht provided in the bobbin case 25
The base portion 4 is attached with a locking member 32 corresponding to the
0 slides on a plane perpendicular to the rotation axis r1 of the outer hook. This causes the locking member 32 to move such as angular displacement. That is, in FIG. 5, when the thread passing portion of the upper thread 26 advances to the position where it abuts the hook stopper member 32, a gap is created between the hook stopper member 32 and the hobbin case 25 by causing the hook stopper member 32 to move as described above. This makes it easier for the upper thread 26 to pass through.

In order for the rotary locking member 32 to be easily fitted into the rotary locking member 33, the rotary locking corresponding portion 3 must be
It is convenient to keep the inner pot 24 stationary facing each other at all times, and measures such as increasing the weight of the lower half of the inner hook 24 including the hobbin case 25 can also be taken.

Effects of the Invention As described above, the vertical full-rotation rotary hook of the present invention is provided with a rotary hook stop member that faces from the outside toward the center of the inner hook within an angular range of 60 to 220 degrees from the course position to the downstream side in the rotational direction of the outer hook. A rotary hook lock corresponding portion is formed on the open side of the inner hook facing the hook locking member to accommodate the hook locking member so that the upper thread can pass through. During this process, twisting occurs and tangles do not occur. Further, since the hook stopper moves in synchronization with the rotation of the outer hook to facilitate the passage of the needle thread, thread passing becomes easier and more reliable, resulting in beautiful seams.

Further, the sewing machine includes a hook stop member provided from the outside toward the center of the inner hook within an angular range of 60 to 220 degrees downstream in the direction of rotation of the outer hook from the course position, and a hook stop member that faces the hook stop member. Upper thread can pass through to the open side of the inner hook.
Since the sewing machine is provided with a vertical full-rotation hook having a hook-locking corresponding portion formed to accommodate the hook-stopping member, the sewing performance is significantly improved compared to the conventional hook.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of the present invention, Fig. 2 is a perspective view of the main parts, and Fig. 3 [2I is a developed view of the inner pot showing the operating mode;
Fig. 4 is a perspective view of the main part showing the operating mode, Fig. 5 is a front view of the main part of another embodiment, Fig. 6 is a perspective view of the vertical full rotation rotary hook from FE, No. 70 is a perspective view of the main part, FIG. 8 is a perspective view of the operating mode. 20...Vertical full rotation, 23...Outer hook, 24.Inner hook, 25...Bobbin case, 26...Upper thread, 26
a... Needle thread loop, 29... Tip, 30... Rail, 32... Hook stopper member, 33... Hook stop corresponding part,
35...Recess, 39...Inner hook holder, 10.Base section representative Patent attorney Kei Saikyo Part 1 Figure 2 Figure 2 Figure 2

Claims (3)

[Claims] (1) From the needle drop position to the downstream side in the direction of rotation of the outer hook 60 to 22
A rotary rotary hook member is provided within the 0 degree angle range and faces toward the center of the inner hook from the outside, and the rotary rotary hook member is fitted onto the open side of the inner rotor opposite to this rotary rotary hook member so that the upper thread can pass therethrough. A vertical full-rotation hook characterized by having a hook corresponding to the hook stop. (2) The vertical full-rotation hook according to claim 1, wherein the hook locking member moves in synchronization with the rotation of the outer hook to facilitate passage of the upper thread. (3) From the needle drop position to the downstream side in the direction of rotation of the outer hook 60~2
A rotary rotary hook member provided within an angular range of 20 degrees from the outside toward the center of the inner hook, and a rotary rotary hook retaining member provided on the open side of the inner hook opposite to this rotary rotary hook member so that the needle thread can pass therethrough. A lockstitch sewing machine equipped with a vertical full-rotation hook having a hook-locking corresponding part formed to fit therein.