JP2576699Y2 - Bobbin case in sewing machine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bobbin case for a sewing machine.

[0002]

2. Description of the Related Art FIGS. 2 to 4 show a conventional example.
In FIG. 2, reference numeral 1 denotes an inner hook rotatably fitted to an outer hook (not shown) mounted on the sewing machine. A bobbin case 3 is fitted into a bobbin case accommodating portion 2 formed at one end opening of the inner hook 1. As shown in FIG. 3, a needle passing hole 5 for passing a sewing needle is formed in a part of the circular inner peripheral wall 4 of the bobbin case housing portion 2, and a bottom portion 6 of the bobbin case housing portion 2 is formed.
A shaft 8 having an annular groove 7 at its tip is provided upright at the center of the shaft. A plurality of guide projections 9 are formed on the inner peripheral wall 4 of the bobbin case housing portion 2, and a notch 10 is formed on an opening surface of the bobbin case housing portion 2.

[0003] As shown in FIG.
Comprises a case body 11 and a latch 13 mounted on the bottom 12 thereof. A locking hole 14 is formed at a central portion of the latch 13 as a locking portion to be locked in the groove 7 of the shaft 8, and a locking claw 15 locked to the notch 10 is formed at one end. Have been. The latch 13 is urged in the direction of the notch 10 by a coil spring (not shown) provided on the case body 11 and is slidably held in a direction perpendicular to the shaft 8. Further, a knob 16 for sliding the latch 13 in a direction opposite to the biasing direction is held on the bottom portion 12 of the case body 11 by a hinge 17 so as to be able to move up and down. Further, a needle drop hole 18 for preventing interference with a sewing needle (not shown) inserted through the needle through hole 5 is opened in the bottom portion 12 of the case main body 11. Further, a cutout portion 19 guided by the guide projection 9 is formed on the outer peripheral wall 11a of the case body 11, and a thread tension spring 20 for pressing the lower thread and applying tension to the lower thread is provided with a screw 21. It is fixed by.

Next, a single bobbin case 3 is shown in FIG.
FIG. 2A is a front view, FIG. 2B is a plan view, and FIG.
Is a rear view. Then, as shown in FIG. 3C, a bobbin housing portion 22 for housing a bobbin (not shown) is formed in the case body 11, and the shaft 8 projects from the bottom surface of the bobbin housing portion 22. A cylindrical shaft 23 that rotatably holds the bobbin is provided upright. Around the cylindrical shaft 23, an anti-spin spring 24 that is pressed against a flange of the bobbin to prevent the bobbin from idling is provided. Further, the notch 19 is set to a depth communicating with the needle drop hole 18 from the opening side of the bobbin housing 22.

Here, in the state shown in FIG. 2, when the knob 16 is raised around the hinge 17, the latch 13 slides to the left in FIG. As a result, the locking claw 15 is disengaged from the notch 10 and the outer peripheral edge of the flange of the bobbin is gripped, so that the locking hole 14 is disengaged from the groove 7 of the shaft 8. Thus, by pulling the raised knob 16, the bobbin case 3
Comes off the inner pot 1. At this time, the bobbin is maintained in a state of being housed in the bobbin housing portion 22 by the locking claw 15.

Further, when the bobbin case 3 is accommodated in the inner pot 1, the both edges of the notch 19 are located outside the guide projections 9, so that the position of the bobbin case 3 relative to the inner pot 1 in the rotation direction is adjusted. Can be matched. The bobbin case 3 is attached to the bobbin case accommodating portion 2 of the inner pot 1, and the knob 16
In a state in which the latch 13 is tilted, the latch 13 is returned by the urging force of the coil spring, the locking claw 15 projects into the notch 10 while releasing the bobbin, and the locking hole 14 is locked in the groove 7 of the shaft 8. Therefore, the bobbin case 3 is prevented from dropping from the inner hook 1, and by rotating the inner hook 1, the bobbin case 3 also rotates.

[0007]

In recent years, sewing materials have been diversified, and cloth and sewing threads may be coated with a synthetic resin-based coating agent. The purpose of the coating is, for example, to maintain airtightness. On the other hand, since heat is generated by the rotation of the inner hook 1 and the reciprocating motion of the sewing needle, the coating agent is melted by the heat and adheres to the inner hook 1 and the bobbin case 3. In addition, static electricity is generated by the adhesion of the coating agent, and dust adheres to a portion where the yarn slips. These foreign substances, such as dust and coating agent, mix with the lubricating oil supplied to the rotating part and enter the gaps between the various parts, thus hindering the sewing operation. In particular, in the case of an embroidery sewing machine, a device such as a cutting knife is used, so that a few millimeters of dust is generated.

[0008] Specifically, the problem that occurs is that, for example, when a mixture of foreign matter and lubricating oil enters between the thread tension spring 20 and the outer periphery of the bobbin case 3, the action of pressing the lower thread becomes unstable, and the lower thread becomes unstable. Cannot provide the proper tension, thereby affecting the seam. Recently, in order to prevent the bobbin from spinning due to rotational inertia when the sewing machine is suddenly stopped, an anti-spin spring 24 for applying a brake to the bobbin is provided on the bottom surface of the bobbin case 3. When the mixture enters between the bottom surface of the bobbin case 3 and the anti-spin spring 24, the braking effect on the bobbin decreases. In order to eliminate such troubles, a worker wastes much time for cleaning dust. If these are not managed, beautiful seams cannot be formed, and the value of high-end products is significantly impaired, and the processor sometimes bears a heavy burden on compensation.

[0009]

According to the present invention, an outer surface of a bottom portion of a case main body is formed with a bottomed needle dropping recess which is not opened on an inner side to avoid interference with a sewing needle, and an opening of a bobbin housing portion is formed. One end is opened to the surface and the other end is set to a depth at which a predetermined interval is formed between the bottom of the case main body and a notch guided by a guide projection formed on the inner peripheral wall of the inner pot. A sealing portion formed on the outer peripheral wall of the case main body and sealing the entire outer periphery of the bobbin housing portion between the cutout portion and the bottom portion is formed on the case main body.

[0010]

According to the present invention, the notch formed in the outer peripheral wall of the case main body is brought close to the opening surface side of the bobbin accommodating portion, the depth is limited, and a sealing portion is formed on the entire outer periphery on the bottom side of the case main body. Since the needle drop recess has a bottom with no opening on the inner surface side ,
Foreign matter can be prevented from entering through the needle drop recess and the notch, thereby preventing the influence on sewing.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIG. The same parts as those described in FIGS. 2 to 4 are denoted by the same reference numerals, and description thereof is omitted. First, a single bobbin case 3 is shown in FIG. FIG. 1A is a front view, and FIG.
Is a plan view, and FIG. 3C is a rear view. Case body 11
A bottomed needle dropping recess 25 is formed in the bottom portion 12. Further, a notch 27 having a depth that allows one end to be opened in the opening surface of the bobbin housing portion 22 and the other end to be separated from the bottom portion 12 of the case main body 11 by a predetermined distance is formed in the case main body 1.
One of the outer peripheral walls 11a is formed. Furthermore, notch 2
A sealing portion 26 that seals the entire outer periphery of the bobbin housing portion 22 between the bottoms 7 and 12 is formed on the outer peripheral wall 11 a of the case main body 11.

In such a configuration, the bobbin case 3
Is fitted to the inner pot 1, by positioning both side edges of the notch 27 outside the guide projection 9, the position of the bobbin case 3 in the rotation direction with respect to the inner pot 1 can be adjusted.

At this time, the inner hook 1 is rotated during sewing, but the notch 27 formed in the outer peripheral wall 11a of the case body 11 is moved toward the opening side of the bobbin accommodating portion 22 to limit the depth. In addition, since a sealing portion 26 is formed on the entire outer periphery of the bottom portion 12 of the case body 11 and the needle drop recess 25 has a bottom, it is possible to prevent foreign matter from entering through the needle drop recess 25 and the notch 27. Can be. Thereby, the influence on the sewing can be prevented.

[0014]

According to the present invention, the bottom of the case body is formed with a bottomed needle dropping recess which does not open on the inner surface to avoid interference with the sewing needle, and one end is opened on the opening surface of the bobbin housing portion and the other end. Is formed at a depth such that a predetermined distance is formed between the bottom of the case body and a notch formed in an outer peripheral wall of the case body, which is guided by a guide protrusion formed on an inner peripheral wall of the inner pot. Since a sealing portion for sealing the entire outer periphery of the bobbin housing portion is formed in the case main body between the cutout portion and the bottom portion, entry of foreign matter from the needle drop recess and the cutout portion can be prevented. This has the effect that the effect on sewing can be prevented.

[Brief description of the drawings]

FIG. 1 shows a bobbin case according to an embodiment of the present invention, wherein (a) is a front view, (b) is a plan view, and (c) is a rear view.

FIG. 2 is a front view showing a fitting state of a conventional inner hook and a bobbin case.

FIG. 3 is a perspective view of a conventional bobbin case.

4A and 4B show a conventional bobbin case, wherein FIG. 4A is a front view, FIG. 4B is a plan view, and FIG. 4C is a rear view.

[Explanation of symbols]

 Reference Signs List 1 inner pot 3 bobbin case 4 inner peripheral wall 8 axis 9 guide projection 10 notch 11 case main body 11a outer peripheral wall 12 bottom 13 latch 14 locking section 15 locking claw 22 bobbin housing section 25 needle dropping recess 26 sealing section 27 notch

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroshi Nihei 20 Tsukakoshi, Ichinomiya-shi, Aichi Pref. (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) D05B 1/00-83/00

Claims (1)

(57) [Scope of request for utility model registration] 1. A case main body in which a bobbin housing portion for rotatably housing a bobbin is formed inside an outer peripheral wall fitted to an inner peripheral wall of a container-like inner pot, and a case body is provided from a center of the inner pot. A latch having a locking portion locked to a protruding shaft and a locking claw locked to a notch formed in an opening surface of the inner hook is displaceable in a direction orthogonal to the shaft. In the case of the bobbin case attached to the outer surface of the bottom, the outer surface of the bottom of the case body has an opening on the inner surface to avoid interference with sewing needles.
The bottom of the bobbin housing portion is formed with a needle dropping recess having no bottom, and one end is opened at an opening surface of the bobbin housing portion, and the other end is set to a depth such that a predetermined interval is provided between the bottom portion of the case main body and the inside. A notch guided by a guide protrusion protrudingly formed on the inner peripheral wall of the shuttle is formed on the outer peripheral wall of the case body, and the entire outer periphery of the bobbin accommodating portion is sealed between the notch and the bottom. A bobbin case in a sewing machine, wherein a sealing portion is formed on the case main body.