JPS6112053Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field This invention relates to a horizontal hook for a sewing machine in which the tip of the outer hook rotates in a plane substantially parallel to the sewing work surface.

Prior Art Conventionally, this type of horizontal pot has, for example, a guide protrusion formed on the inner periphery of the outer pot, the inner pot is constructed by screwing two upper and lower divided bodies, and the boundary between each divided body is The inner hook is attached to the outer hook with the guide protrusion sandwiched therebetween. The outer pot is rotated while the rotation of the inner pot is restricted within the outer pot. However, in this conventional structure, when removing thread caught between the guide protrusion and the inner hook, or removing thread waste inside the outer hook, the screws are loosened and the inner hook is removed. It is necessary to disassemble each segment. Therefore, there is a drawback that the operation of removing the inner pot from the outer pot becomes very troublesome.

Purpose This invention was made in order to eliminate the above-mentioned defects, and its purpose is to provide a horizontal hook for a sewing machine that allows the inner hook to be easily attached to and removed from the outer hook and that has a simplified configuration. There is a particular thing.

Embodiment An embodiment embodying this invention will be described below with reference to FIGS. 1 to 4. A vertically extending shaft 1 is rotatably supported in a bed portion (not shown) of a sewing machine frame, and a horizontal hook 2 is attached to the upper end of the shaft 1. Then, while the needle 3 moves back and forth once as the main shaft of the sewing machine rotates, the horizontal hook 2 together with the shaft 1 is rotated twice in the counterclockwise direction in FIG. 1 in a plane substantially horizontal to the sewing work surface. It's becoming like that. The horizontal hook 2 is composed of an outer hook 4 having a substantially cylindrical shape with a bottom and an inner hook 5 whose rotation is restricted within the outer hook 4. A guide protrusion 6 extending almost all around the inner circumference of the outer pot 4 is formed protrudingly from the inner circumference.
A slot 8 as a notch is formed in the outer peripheral wall of the outer pot 4. Further, a tip 7 is formed on the guide protrusion 6 so as to protrude into the slot 8. A cutout recess 9 is formed in the guide protrusion 6 at a position spaced apart from the slot 8 by a predetermined distance.

A bobbin accommodating portion 10 for accommodating a bobbin 11 is formed approximately in the center of the inner pot 5, and a flange portion 12 that can be engaged with the guide protrusion 6 from above is formed on the outer periphery of the bobbin accommodating portion 10. Said sword tip 7
A needle escape opening 13 is formed in the flange portion 12 of the inner hook 5 so as to be located on the rotational locus of the needle. This needle drop opening 13
A first protrusion 14 that can be opposed to the slot 8 is formed on the outer peripheral wall of the inner hook 5 near the outer hook 4 in the rotational direction, and a first protrusion 14 that is opposite to the needle release opening 13 is formed on the outer circumferential wall of the inner hook 5 on the rotational direction side of the outer hook 4. On the side, a second protrusion 15 that can be opposed to the notch recess 9 is integrally formed on the outer circumferential wall of the inner pot 5 to protrude. And each protrusion 1
4, 15 and the lower surface of the flange portion 12 of the inner hook 5, with the guide protrusion 6 of the outer hook 4 being sandwiched,
is now being rotated. Further, when the outer hook 4 is stopped with the slot 8 and the notched recess 9 facing each of the protrusions 14 and 15, the inner hook 5 is lifted upward from the outer hook 4 and the inner hook 5 is replaced with the outer hook. It can be removed from 4.

A pair of engagement grooves 17a, 1 are provided on the upper surface of the inner pot 5.
7b is formed, and a regulating member 18 that swings as the outer hook 4 rotates is disposed within the bed portion, and each engagement piece 19a,
Rotation of the inner hook 5 within the outer hook 4 is restricted by alternately engaging the engagement grooves 17a and 17b. Furthermore, the flange portion 12 of the inner pot 5 is adjacent to the other engagement groove 17b.
A locking groove 20 is formed on the upper surface of the bed, and a locking piece 21 is provided inside the bed portion, and the locking piece 21 is engaged with the locking groove 20. Therefore, in this embodiment, the engagement between the locking piece 21 and the locking groove 20, and the engagement between the flange portion 12 and each protrusion 14, 15 of the inner hook 5 and the guide protrusion 6 of the outer hook 4 are prevented. The inner pot 5 is designed not to float up due to the situation. Furthermore, in this embodiment, a notched recess 2 is provided in the guide protrusion 6 of the outer hook 4 adjacent to the notched recess 9.
2 is formed to prevent interference between the needle 3 and the guide protrusion 6 when the needle 3 is lowered.

Next, the operation of the sewing machine configured as described above will be explained. As shown in FIGS. 1 and 3, when the sewing machine is operating, the needle 3 is reciprocated in the vertical direction, and the outer hook 4 is rotated counterclockwise in FIG. The regulating member 18 is accordingly swung. Then, when the needle is lowered to the bottom dead center and then raised slightly, the upper thread T1 carried by the needle 3 is captured. Immediately after that, a slot 8 and a notch recess 9 as a notch in the outer pot 4
is opposed to each of the protrusions 14 and 15, but at this point, since the needle thread T1 is not placed below the bottom of the inner hook 5, the inner hook 5 floats due to the needle thread pulling force of a thread take-up (not shown). There is no risk of it happening.

As the outer hook 4 continues to rotate, the upper thread T1 is placed below the bottom and on the top surface of the inner hook 5, as shown in FIG. Then, based on the needle thread pull-up force of the thread take-up, the needle thread T separates from the tip 7, passes through the inner hook 5, and is attached to the bobbin 11 by the loop of the needle thread T1.
The bobbin thread T2 is let out. When the needle thread T1 passes through the inner hook 5, the needle thread pulling force of the thread take-up acts in a direction that causes the inner hook 5 to float. However, at this point, since the slot 8 and the notch recess 9 are spaced apart from each of the protrusions 14 and 15, the inner pot 5
There is no risk that it will surface. Further, although the engagement between the locking groove 20 and the locking piece 21 more reliably prevents the inner pot 5 from floating, both 20 and 21 may be omitted to simplify the configuration. can.

Now, when replacing the bobbin 11 that has used up the bobbin thread T2 with a new one, or when cleaning the inside of the outer hook 4, with the sewing machine stopped,
The tip 7 of the outer hook 4 is connected to one of the locking pieces 1 of the regulating member 18.
Place it near 9a. That is, the outer hook 4 is placed at a predetermined angular position. In this state, the locking piece 19a separates from one of the engagement grooves 17a, and the other engagement piece 19b engages with the other engagement groove 17b.
is held in the engaged state. In addition, the slot 8 and the notch recess 9 of the outer hook 4 are connected to the respective protrusions 14 and 15 of the inner hook 5.
are placed opposite each other. By pulling up the inner hook 5 diagonally upward in this state, the inner hook 5 and bobbin 11 can be easily removed from the outer hook 4.

On the other hand, when the inner hook 5 is attached to the outer hook 4, the other engagement groove 17b of the inner hook 5 is placed with the tip 7 and the regulating member 18 in the position shown in FIG.
is inserted below the other engaging piece 19b of the regulating member 18, and the protrusions 14 and 15 are arranged in the slot 8 and the notch recess 9, respectively.
can be easily installed on the

Note that this invention is not limited to the above embodiment, and for example, the second protrusion 15 and the notch recess 9
It is also possible to arbitrarily change the configuration of each part without departing from the spirit of this invention, such as by omitting .

Effects As detailed above, this invention has at least one protrusion attached to the inner pot in order to clamp the guide protrusion formed on the inner periphery of the outer pot in cooperation with the lower surface of the outer periphery flange of the inner pot. A notch into which the protrusion can fit is formed on the inner hook guide protrusion, so that the inner hook can be attached to and removed from the outer hook when the outer hook is at a predetermined angular position. This provides excellent effects in that the structure can be simplified and the inner pot can be attached and detached from the outer pot with great ease.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing a horizontal hook of a sewing machine embodying this invention and its related components, Fig. 2 is a partial side view of the horizontal hook, Fig. 3 is an explanatory diagram of the operation of the horizontal hook, and Fig. 4 is a diagram showing the operation of the horizontal hook. FIG. 4 is a sectional view taken along line A-A in FIG. 3; Outer hook...4, Inner hook...5, Guide protrusion...6, Tip...7, Slot as notch...8, Notch recess...9, Flange...12, For needle drop relief Opening...
...13, First protruding part...14, Second protruding part...1
5.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. In a horizontal hook of a sewing machine in which the tip 7 of the outer hook 4 rotates in a plane substantially parallel to the sewing work surface, a guide protrusion formed on the inner periphery of the outer hook 4. 6 in cooperation with the lower surface of the outer peripheral flange portion 12 of the inner pot 5.
4 and 15 are formed on the outer circumferential wall of the inner hook 5, and cutouts 8 and 9 into which the protrusions 14 and 15 can fit are formed on the guide protrusion 6, and when the outer hook 4 is at a predetermined angular position, A horizontal hook for a sewing machine, characterized in that the inner hook 5 is removable from the outer hook 4. 2. The horizontal hook of a sewing machine according to claim 1, wherein the notch is a slot 8 formed near the tip 7. 3. The inner hook 5 is formed on the outer peripheral wall of the outer hook 4 on the rotational direction side near the needle drop opening 13 and on the outer peripheral wall on the opposite side of the needle drop opening 13. A horizontal hook for a sewing machine according to claim 1, which has two protrusions 14 and 15.