JP4443706B2 - Clockwise full rotation vertical hook inner pot - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an inner hook of a sewing machine, and more particularly to an inner hook of a clockwise full rotation vertical hook.
[0002]
[Prior art]
The sewing machine hook has an outer hook that rotates in conjunction with the main shaft of the sewing machine, and an inner hook that is fixed to the sewing machine. The outer hook scoops the upper thread carried by the needle and surrounds the inner hook. Turn to pass the lower thread in the inner hook and form a seam.
[0003]
A race portion is formed in the inner hook, and a corresponding race groove is formed in the outer hook, and the race portion of the inner hook is fitted into the race groove of the outer hook. The inner hook and the outer hook are usually made of steel, but in order to reduce the frictional resistance due to oil-free operation, a technique for making only the inner race portion of the inner hook made of synthetic resin is known (Japanese Patent Laid-Open No. 6-238084, 10-146485).
[0004]
FIGS. 8 to 10 are perspective views showing an example in which the race portion of the inner hook of the counterclockwise full rotation vertical hook is made of synthetic resin, FIG. 8 is the inner hook body 10, and FIG. 9 is the race portion 20 made of synthetic resin. FIG. 10 shows an inner hook incorporating the race portion 20.
[0005]
The inner hook body 10 includes a substantially circular bottom portion 11, a support column 12 provided upright from the center portion on the front surface 11 </ b> A side of the bottom portion 11, and a circumferential surface formed in the direction from the outer periphery of the bottom portion 11 to the support column 12. 13 A groove 13 a is formed on the peripheral surface 13 of the inner hook body 10. In FIG. 9, the synthetic resin lace portion 20 includes a yarn dividing portion 20a and a yarn removal portion 20b, and is fitted and fixed into the groove 13a of the inner hook body 10 as shown in FIG. The race portion 20 is formed in the intermediate portion of the peripheral surface 13 in the hook shaft direction (perpendicular to the bottom portion 11). The sewing machine needle 31 that moves up and down during sewing passes through the needle drop hole 13b of the inner hook body 10 when it is at the lowest position.
[0006]
FIG. 11 is a rear view for explaining the relationship between the inner hook of FIGS. 8 to 10, the sword tip 32 of the outer hook (not shown), and the upper thread 33. The outer hook catches the upper thread 33 by the sword tip 32 and rotates around the inner hook body 10 in the R1 direction. The captured upper thread 33 is divided into an upper thread 33a on the front side of the inner hook body 10 and an upper thread 33b on the rear side in the thread dividing part 20a of the race part 20, and the upper thread 33b on the rear side is used for rotation of the outer hook. Along with this, it moves while contacting the back surface 11B of the bottom 11 of the inner hook body 10. Eventually, the upper thread 33 comes off from the thread dropout portion 20b and comes out of the hook and entangles with a lower thread (not shown) to form a stitch. Thereafter, the sword tip 32 captures the upper thread 33 again.
[0007]
Thus, the upper thread 33b on the back surface 11B side of the bottom part 11 moves between the thread separating part 20a and the thread missing part 20b while in contact with the bottom part 11, but the thread separating part 20a and the thread missing part that are in contact with the upper thread 33b. The part between 20b is called the yarn crossing surface 11a.
[0008]
12 to 15 are perspective views showing an example in which the inner hook race part of the clockwise full rotation vertical hook is made of synthetic resin. FIG. 12 shows the inner hook body 10 and FIG. 13 shows the synthetic resin race part 20. 14 and 15 show a state in which the race portion 20 is incorporated in the inner hook body 10. As is apparent from FIG. 14, the inner hook main body 10 of the clockwise full-rotation vertical hook is formed so that the bottom 11 and the race portion 20 of the inner hook main body 10 are substantially flush with each other on the back side. . The inner hook main body 10 is disposed at a position that does not overlap the needle drop point with respect to the needle 31 of the sewing machine that moves up and down during sewing, and the needle 31 passes through the back surface 11B side at the bottom when the needle is lowered.
[0009]
The bottom portion 11 is formed with a recess on the back surface 11B side so that the outer peripheral portion 11b is thin. The lace part 20 made of synthetic resin has a shape in which a part of the ring is cut, and the cut ends are a thread dividing part 20a and a thread dropping part 20b, respectively. The race portion 20 is bonded and fixed to the outer peripheral portion 11 b of the bottom portion 11 of the inner hook body 10.
[0010]
FIG. 16 is a rear view for explaining the relationship among the inner hook body 10 of FIGS. 12 to 15, the sword tip 32 of the outer hook (not shown), and the upper thread 33. Since it is a clockwise full rotation vertical hook, the rotation direction of the outer hook is opposite to that of the counterclockwise full rotation vertical hook of FIG. The upper thread 33b on the back side of the inner hook main body 10 moves from the thread dividing part 20a to the thread removing part 20b while being in contact with the yarn passing surface 11a. 14 and 16, reference symbol A indicates a region that is contacted when the upper thread 33 b on the back surface 11 </ b> B side of the bottom portion of the inner hook body 10 moves from the yarn separation portion 20 a to the yarn removal portion 20 b.
[0011]
[Problems to be solved by the invention]
As described above, the inner hook body 10 in which the race portion 20 of the inner hook body 10 is made of a synthetic resin is known, but the race portion 20 and the other portions are formed of different members, and the materials thereof are also different. It was. In the case of the counterclockwise full-rotation vertical hook shown in FIGS. 8 to 11, the race portion 20 is fitted into a groove 13 a formed in the intermediate portion in the hook shaft direction of the peripheral surface 13 of the inner hook body 10. Fixed. However, in the case of the clockwise full rotation vertical hook shown in FIGS. 12 to 16, the race portion 20 is bonded and fixed to the back surface 11B of the bottom portion of the inner hook body 10, and the race portion 20 is a part of the ring. The yarn dividing portion 20a and the yarn dropping portion 20b are formed at both ends of the cut shape. For this reason, when an external force F from the front side toward the back side is applied to the vicinity of the yarn dividing portion 20a and the yarn removing portion 20b of the lace portion 20 as shown in FIG. 15, the yarn dividing portion 20a and the yarn removing portion 20b are connected to the inner hook. It is easy to peel off from the main body 10.
[0012]
Further, in the region A where the upper thread 33 comes into contact, there is a seam between the race portion 20 (the yarn dividing portion 20a and the yarn dropping portion 20b) and the bottom rear surface 11B (the yarn crossing surface 11a) of the inner hook body 10. In such a joint, the surface is difficult to be formed smoothly and burrs are easily formed. For this reason, the upper thread 33 may be caught by the joint, and thread breakage, looping, etc. may occur.
[0013]
An object of the present invention is to provide an inner hook of a clockwise full-rotation vertical hook having a novel structure which has not been conventionally obtained.
Another object of the present invention is to provide an inner portion of a clockwise full-rotation vertical hook that can prevent thread breakage, looping, and the like caused by the upper thread being hooked on the seam between the yarn dividing portion and the yarn slipping portion and the yarn crossing surface. To provide a kettle.
[0014]
Still another object of the present invention is to provide an inner hook of a clockwise fully rotating vertical shuttle that can prevent the race portion 20 from being peeled off.
[0015]
[Means for Solving the Problems]
The present invention relates to an inner pot having a circular bottom portion, a support column provided upright from the center portion on the front side of the bottom portion, and a peripheral surface formed from the outer periphery to the front side on the front side of the bottom portion. A sewing machine needle that moves up and down during sewing passes through the back surface of the bottom portion, and includes a main body and an inner hook race portion that is fixed to the outside along the outer periphery of the bottom portion and is cut out at a part of the entire circumference. The upper hook captured by the outer hook is divided into a hook front side and a hook rear side by a thread dividing portion formed at one end of the notched portion of the inner hook race portion, and the notched In the inner hook of the clockwise full rotation vertical hook where the upper thread is pulled out from the thread drop portion formed at the other end of the portion, the hook is sandwiched between the thread dividing portion and the yarn drop portion, and the hook rear side of the upper thread A thread crossing surface that is in contact with the part divided into A recess which is recessed with respect to the cutout portion bottom front end edge of the bottom provided with a notch portion at a position corresponding to the yarn over surface forming a provided so as to cover the cutout portion, the The yarn crossing surface is integrally formed with the inner hook race portion with resin, and the protruding portion that is in contact with the concave portion formed in the notch portion from the front side is also formed integrally with the inner hook race portion. It is characterized by.
[0016]
Preferably, a concave portion that is recessed with respect to the bottom rear surface is provided at an outer peripheral edge portion other than the notch portion of the bottom surface, and the inner hook race portion is formed with respect to a recess portion that is formed at an edge portion other than the notch portion. Make contact from the back side .
[0017]
More preferably, the yarn crossing surface is an inclined surface inclined so as to connect the outer peripheral surface of the inner hook body and the back surface of the bottom portion .
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1-7 is a figure which shows the inner hook of the clockwise clockwise rotary hook of this Embodiment.
[0019]
1 to 3 show the inner hook body, FIG. 1 (A) is a rear view, FIG. 1 (B) is a front view, FIG. 2 (A) is a perspective view seen from the rear side, and FIG. The perspective view seen from the front side, FIG. 3 is XX sectional drawing of FIG. 1 (B). 4A and 4B show the race portion, where FIG. 4A is a perspective view seen from the back side, and FIG. 4B is a perspective view seen from the front side. The inner hook according to the present embodiment is configured by fixing the race portion 20 of FIG. 4 to the inner hook body 10 of FIGS. 5 and 6 show the inner hook incorporating the race portion 20, FIG. 5 (A) is a rear view, FIG. 5 (B) is a front view, and FIG. 6 (A) is a perspective view as seen from the rear side. 6 (B) is a perspective view seen from the front side, and FIG. 7 is a YY sectional view of FIG. 5 (B).
[0020]
The inner hook body 10 is formed with a substantially circular bottom portion 11, a support column 12 provided upright from the center portion on the front surface 11 </ b> A side of the bottom portion 11, and an outer periphery to a front surface direction on the front surface 11 </ b> A side of the bottom portion 11. The peripheral surface 13 is provided. The bottom portion 11 is formed with a recess on the back surface 11B side so that the outer peripheral portion 11b is thin. Further, a notch portion 11d is formed in the bottom portion 11. When the shuttle is attached to the sewing machine, the cutout portion 11d is arranged upward so as to be in the direction of the sewing needle. A recess 11e is formed on the front surface 11A side of the bottom 11 along the vicinity of the outer peripheral edge 11c forming the notch 11d.
[0021]
The lace portion 20 is formed in a substantially annular shape from a synthetic resin such as liquid crystal polymer, high-density polyethylene, and polyimide. The lace portion 20 is formed by cutting out a part of the outer peripheral portion thereof to form a yarn crossover surface 20c, and a yarn dividing portion 20a and a yarn dropout portion 20b are formed at both ends of the yarn crossover surface 20c. The yarn crossing surface 20c is formed to be inclined in the axial direction (left-right direction in FIG. 7) so that the upper yarn can move smoothly. The lace portion 20 is fixed to the inner hook body 10 such that the yarn crossing surface 20 c is disposed in a space formed by the notch portion 11 d of the bottom portion 11 of the inner hook body 10. For this reason, the notch part 11d of the bottom part 11 of the inner hook main body 10 is formed larger than the yarn crossing surface 20c.
[0022]
The lace portion 20 is formed with a protruding portion 20d having a shape corresponding to the outer peripheral edge 11c of the bottom portion 11 of the inner hook body 10 from the yarn crossing surface 20c toward the center of the lace portion 20, and further from the protruding portion 20d to the lace portion 20. A projecting portion 20e having a shape corresponding to the concave portion 11e of the bottom portion 11 is formed toward the central direction. The projecting portion 20d is formed in a shape such that when the race portion 20 is fixed to the bottom portion 11 of the inner hook body 10, the rear surface of the projecting portion 20d is substantially flush with the rear surface 11B of the bottom portion 11, and similarly the projecting portion 20e is formed in a shape such that the front surface thereof is substantially flush with the front surface 11A of the bottom portion 11.
[0023]
As shown in FIG. 5A, the outer hook (not shown) catches the upper thread 33 by the sword tip 32 and rotates around the inner hook body 10 in the R2 direction. The captured upper thread 33 is divided into an upper thread 33a on the front side of the inner hook body 10 and an upper thread 33b on the rear side in the thread dividing part 20a of the race part 20, and the upper thread 33b on the rear side is used for rotation of the outer hook. Along with this, it moves while in contact with the yarn crossover surface 20c. Eventually, the upper thread 33 comes off the thread dropout portion 20b and comes out of the hook, and is entangled with a lower thread (not shown) to form a stitch. Thereafter, the sword tip 32 captures the upper thread 33 again.
[0024]
Thus, the upper thread 33b on the bottom surface side of the inner hook body 10 moves from the thread separating part 20a to the thread removing part 20b through the thread crossing surface 20c, but the thread separating part 20a, Since the transition surface 20c and the thread dropout portion 20b are integrally formed of resin, there is no joint between the resin portion and the steel portion. Therefore, the surface can be formed smoothly and burrs are hardly formed. For this reason, the upper thread 33 can move smoothly.
[0025]
As shown in FIGS. 6 and 7, even if an external force F1 is applied in the vicinity of the yarn crossing surface 11a of the race portion 20 from the front direction, the race portion 20 is supported by the concave portion 11e of the bottom portion 11. 11 hardly peels from the back surface 11B. When the external force F <b> 2 is applied to the race portion 20 from the back side, the race portion 20 is supported by the outer peripheral portion 11 b of the bottom portion 11, so that it is difficult to peel off from the front surface 11 </ b> A side of the bottom portion 11 of the inner pot main body 10.
[0026]
Further, the lace portion 20 according to the present embodiment is different from the lace portion in the inner hook of the clockwise full rotation vertical hook according to the conventional example shown in FIG. Since the endless annular shape is used, the yarn dividing portion 20a and the yarn dropping portion 20b are not particularly easily peeled off.
[0027]
Furthermore, by integrally forming the yarn dividing portion 20a and the yarn dropout portion 20b and the yarn crossover surface 20c with resin, there is no seam in the region where the upper yarn 33 contacts, and the surface is smoothly formed. For this reason, smooth yarn crossing can be realized, and yarn breakage, looping, and the like can be prevented.
[0028]
Although the present invention has been described above based on the embodiment shown in the drawings, the present invention is not limited to this embodiment and can be variously modified within the scope of the matters described in the claims. For example, although the example in which the yarn crossing surface 20c and the race portion 20 are integrally formed of resin is shown, only the yarn crossing surface may be made of resin and fixed to the inner hook body 10.
[0029]
【The invention's effect】
According to the present invention, an inner hook body having a notch portion at a position corresponding to the yarn passing portion in the inner hook of the clockwise full rotation vertical hook having the inner hook race portion and the yarn passing portion on the back side of the bottom portion; There is provided an inner hook of a clockwise full-rotation vertical hook having a novel structure, which has a novel structure, which is constituted by a resin thread-crossing surface which is fixed to the inner hook body so as to cover the notch.
[0030]
By integrally molding the thread crossing surface and the inner hook race part with resin and fixing it to the inner hook body, there is a seam between the thread dividing part and the thread dropout part and the thread crossing surface in the region where the upper thread contacts. A smooth surface can be formed without being present. For this reason, it is possible to prevent yarn breakage, looping, and the like due to the upper thread being caught by the seam.
[Brief description of the drawings]
1A and 1B show an inner hook body of a clockwise full-rotation vertical hook according to the present embodiment, in which FIG. 1A is a rear view and FIG. 1B is a front view.
2A and 2B show an inner hook body of the present embodiment, in which FIG. 2A is a perspective view seen from the back side, and FIG. 2B is a perspective view seen from the front side.
FIG. 2 (B) is a perspective view seen from the front side,
3 is a cross-sectional view taken along the line XX in FIG.
4A and 4B show a race portion of the inner hook according to the present embodiment, where FIG. 4A is a perspective view seen from the back side, and FIG. 4B is a perspective view seen from the front side.
5A and 5B show the inner hook of the present embodiment, in which FIG. 5A is a rear view and FIG. 5B is a front view.
6A and 6B show the inner hook of the present embodiment, where FIG. 6A is a perspective view seen from the back side, and FIG. 6B is a perspective view seen from the front side.
7 is a YY cross-sectional view of FIG.
FIG. 8 is a perspective view of an inner hook body of a counterclockwise vertical hook according to a conventional example.
FIG. 9 is a perspective view of a race portion of a counterclockwise vertical shuttle according to a conventional example.
FIG. 10 is a perspective view of an inner hook incorporating a race portion of a counterclockwise vertical hook according to a conventional example.
11 is a rear view for explaining the relationship between the inner hook of FIGS. 8 to 10, the sword tip of the outer hook (not shown), and the upper thread. FIG. 12 is a perspective view of the inner hook body of the clockwise vertical hook according to the conventional example. FIG.
FIG. 13 is a perspective view of a race portion of a clockwise vertical shuttle according to a conventional example.
FIG. 14 is a perspective view of an inner hook of a clockwise clockwise hook according to a conventional example as viewed from the back side.
FIG. 15 is a perspective view of an inner hook of a conventional clockwise vertical hook as viewed from the front side.
FIG. 16 is a rear view for explaining the relationship between the inner hook of FIGS. 12 to 15, the sword tip of the outer hook not shown, and the upper thread.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Inner hook main body 11 Bottom part 11A Bottom front surface 11B Bottom back surface 11a Yarn crossing surface 11b Outer peripheral part 11c Outer peripheral edge 11d Notch part 11e Recessed part 12 Strut 13 Peripheral surface 13a Groove 13b Needle drop hole 20 Race part 20a Thread division part 20b Yarn Dropping portion 20c Yarn crossing surface 20d Protruding portion 20e Protruding portion 31 Needle 32 Blade tip 33 Upper thread

Claims (3)

A circular bottom, a support column provided upright from the center on the front side of the bottom, and an inner pot body having a peripheral surface formed from the outer periphery to the front on the front side of the bottom;
An inner hook race part fixed to the outside along the outer periphery of the bottom part and having a part of the entire periphery cut away;
A sewing needle that moves up and down during sewing passes through the back surface of the bottom portion, and the upper thread captured by the outer hook by a thread dividing portion formed at one end of the notched portion of the inner hook race portion is hooked. In the inner hook of the clockwise full rotation vertical hook where the upper thread is pulled out from the thread dropout portion formed at the other end of the notched portion while being divided into the front side and the hook rear side ,
The yarn is sandwiched between the yarn dividing portion and the yarn removal portion, and has a yarn crossing surface that is in contact with a portion divided on the hook back side of the upper yarn,
The bottom of the cutout portion at the position corresponding to the yarn linkage surface forming a part of the outer periphery provided Rutotomoni, a recess which is recessed with respect to the cutout portion bottom front end edge of said bottom surface is provided,
The yarn crossing surface is integrally formed with resin together with the inner hook race portion so as to cover the notch portion, and the protruding portion that comes into contact with the concave portion formed in the notch portion from the front side is also formed on the inner side. An inner hook of a clockwise full turn vertical hook characterized by being formed integrally with the hook race . Provide a recessed portion recessed with respect to the back of the bottom at the outer peripheral edge other than the notch of the bottom,
  2. The inner hook of a clockwise full-rotation vertical hook according to claim 1, wherein the inner hook race portion is in contact with a concave portion formed on an end edge portion other than the notch portion from the back side. The inner hook of a clockwise full-rotation vertical hook according to claim 1 or 2, wherein the yarn crossing surface is an inclined surface that is inclined so as to connect the outer peripheral surface of the inner hook main body and the back surface of the bottom portion. .

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