JPH0775694A - Opener for horizontally rotating shuttle - Google Patents

Abstract

PURPOSE:To provide the opener of a horizontally rotating shuttle through which a needle thread can smoothly pass in order to execute stable sewing. CONSTITUTION:A base end part 11a of an opener 11 having elasticity is screwed to a fixed body 12 provided in the rear of a horizontally rotating shuttle A, and in the lower face of the tip of a free end part 11b, a hemispherical end part is provided. This hemispherical end part is engaged with a recessed part provided on the opposite side to a sewing needle 14, on the upper face of a rotating hook bobbin case holder 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an opener for a horizontal hook of a sewing machine.

[0002]

2. Description of the Related Art Conventionally, the sewing machine is located below the sewing needle of a sewing machine.
The horizontal hook of the sewing machine, which captures the upper thread loop formed by the ascending / descending drive of the sewing needle and intersects with the held lower thread, is configured as shown in FIG.

In FIG. 5, A is a horizontal shuttle, and this horizontal shuttle A comprises an outer hook 2 and an inner hook 1, and the outer hook 2 moves up and down a sewing needle (not shown) of the sewing machine. It has a sword tip K for catching the needle thread formed by driving, and is adapted to rotate in the direction of arrow X according to the up-and-down drive of the sewing needle.

Further, the inner hook 1 is provided so that a bobbin around which a lower thread is wound is stored and placed in the outer hook 2.

When the outer pot 2 of the rotary pot A is rotationally driven, the inner pot 1 placed on the outer pot 2 follows the outer pot 2 and is unnecessarily rotationally driven in the same direction. There is an inconvenience.

In order to prevent unnecessary rotation of the inner hook 1, the horizontal hook A is provided with rotation preventing means 8 for preventing the inner hook 1 from rotating.

The rotation preventing means 8 is composed of a protrusion 7 formed on the inner pot 1 and a recess 6 formed in the needle plate 4 so as to receive the protrusion 7. The engagement prevents the inner hook 1 from unnecessarily rotating following the rotation of the outer hook 2.

However, there are the following problems in preventing the inner pot 1 from rotating only by the rotation preventing means 8 constructed as described above.

The horizontal hook A opens the upper thread after passing through the upper thread that has been caught and crossing the lower thread, but the upper thread trying to slip through is caught by the rotation preventing means 8. Occurs.

That is, as shown in FIG. 6, there is a disadvantage that the upper thread S is caught at this portion and thread breakage occurs.

For this reason, there has been proposed an opener for opening a predetermined gap through which the upper thread S can pass between the protrusion 7 and the recess 6 of the rotation preventing means 8.

Reference numeral 5 shown in FIG. 5 is an opener. The opener 5 includes a fixed body 9 fixed near the horizontal hook A,
One end is fixed to the fixed body 9, and the other end extends to a position facing the engaging portion 3 formed on the outer peripheral surface of the inner pot 1,
The contact rod 10 is made of an elastic body.

The opener 5 constructed as described above is
By preventing the inner hook 1 from moving, the normal contact between the protrusion 7 and the recess 6 is eliminated as shown in FIG. 7, and the upper thread S captured by the horizontal hook A can pass through the horizontal hook A properly. Gap W
Can be formed between them.

The opener 5 comes into contact with the upper thread S when the upper thread S passes through the horizontal hook A, and the upper thread S rotates the contact rod 10 made of an elastic body to rotate the outer hook 2. It can be slightly curved in the direction, and can slide through between the engaging portion 3 and the contact rod 10.

[0015]

However, the above-mentioned conventional opener has the following problems.

The horizontal shuttle A, which rotates at a high speed, causes a disturbance in the upper thread loop S released from the sword tip K when the upper thread S is captured and passed through. Those skilled in the art refer to such yarn turbulence as yarn violence.

When the needle thread S passing through the horizontal shuttle A is violently threaded and the needle thread S reaches the opener 5, the contact rod 1
As shown in FIG. 8, the needle thread S, which is engaged with 0 in a point contact, may be entangled with the contact rod 10.

When such a phenomenon occurs, the timing of releasing the upper thread S of the horizontal shuttle A becomes irregular, that is, it becomes later than usual, and uneven stitches are formed in the formed seam.
Alternatively, there has been a serious problem that the upper thread S is broken in the opener portion without releasing the upper thread S.

The present invention has been made in order to solve the above-mentioned problems, and provides an opener for a horizontal hook in which the upper thread can pass smoothly in order to perform stable sewing. Is intended.

[0020]

In order to achieve this object, an opener for a horizontal hook according to the present invention has an inner hook rotatably held therein, has a sword tip on the outside, and rotates about a vertical axis. An outer hook that moves, a concave section and a convex section that allows relative movement in the concave section, one of which is provided on the inner hook and the other is provided on a stationary portion such as a needle plate, and an anti-rotation means, and an inner hook. A horizontal hook device of the sewing machine, which comprises an opener for elastically abutting against the ridge to form a gap through which the needle thread coming out of the hook can pass between the concave and convex portions of the rotation preventing means. In addition, an engaging portion between the opener and the inner hook is provided at a position opposite to the sewing needle with respect to the center of the rotary shaft of the inner hook.

[0021]

The opener of the horizontal hook of the present invention having the above-mentioned structure is provided with an engaging portion for engaging with the inner hook on the upper surface of the inner hook and at a position opposite to the sewing needle with respect to the center of the rotary shaft of the hook. The free end is elastically brought into contact with the engaging portion to form a predetermined gap through which the needle thread passes between the uneven portions of the rotation preventing means.
Further, the upper thread is gradually fed out by the sword tip of the outer hook and passes through the center of the hook, but at that time, by passing through the engaging portion between the inner hook and the opener, the upper thread loop is not entangled with the opener. Properly go through.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the opener for a horizontal hook according to the present invention will be described below with reference to FIGS.

In FIG. 1, the horizontal hook A is an outer hook 2 and an inner hook 1.
The outer hook 2 is provided with a hook K for catching an upper thread (not shown) formed by the up-and-down drive of the sewing needle 14 of the sewing machine.
And is adapted to rotate in the direction indicated by the arrow X in accordance with the up-and-down drive of the sewing needle 14. And the inner pot 1
Is provided so that the bobbin around which the lower thread is wound is stored and placed in the outer hook 2.

Further, the inner hook 1 is provided with a projection 7, and the needle plate 4 is formed with a recess 6 having a recess shape so as to receive the projection 7. 1
Does not unnecessarily rotate following the rotation of the outer pot 2. The concave portion 6 and the protruding portion 7 constitute the rotation preventing means of the present invention.

Further, the base end portion 11a of the opener 11 having elasticity is fixed to the fixed body 12 provided at the rear of the horizontal hook A.
3 is attached to the lower surface of the tip of the free end 11b.
A hemispherical end 11c is provided as shown in FIG. The hemispherical end 11c is engaged with a recess 1a provided on the upper surface of the inner hook 1 on the side opposite to the sewing needle 14. And
When the outer pot 2 is rotated, as shown in FIG.
a is pressed against the end 11c of the opener, and the rotation of the inner pot 1 is blocked. In this state, the protrusion 7 of the rotation prevention means 8
A gap through which the needle thread loop can pass is formed between the groove and the recess 6.

The needle thread loop S caught by the sword tip K of the outer hook 2 gradually crosses the inner hook 1 so as to pass through the inner hook 1 as shown in FIG. 4, and reaches the central portion of the inner hook 1. At this time, at the engaging portion between the recess 1a of the inner hook 1 and the end portion 11c of the opener, the needle thread loop S in a tensioned state as the outer hook 2 rotates.
Comes into contact with the end 11c of the opener 11 shown in FIG.
Furthermore, the end portion 11c can be pushed upward, and the end portion 11c can be slid properly between the recess 1a and the end portion 11c.

As described above, according to the opener of the horizontal hook of this embodiment, since the opener 11 is not provided near the opening of the upper thread loop S from the sword tip K, the upper thread loop S is not entangled with the opener 11. It is possible to prevent uneven stitches in the formed seam,
It is possible to prevent a phenomenon in which the upper thread S is broken at the opener 11 portion.

[0028]

As is apparent from the above description, according to the opener of the horizontal hook of the present invention, the engaging portion between the opener and the inner hook is located on the upper surface of the inner hook and on the side opposite to the sewing needle. Since the upper thread can slide properly through the engaging portion while maintaining the tension state, it is possible to prevent uneven sewing due to repeated loosening and tension of the upper thread and the opener portion. It is possible to prevent the thread breakage of the upper thread in the above and improve the quality of the sewn product.

[Brief description of drawings]

FIG. 1 is an external perspective view of an opener for a horizontal hook according to this embodiment.

FIG. 2 is a diagram of FIG. 1 viewed from the right side.

FIG. 3 is an enlarged view of an engaging portion between the opener and the inner hook of FIG.

FIG. 4 is an enlarged view showing a state where the upper thread passes through the opener of the horizontal shuttle of the present embodiment.

FIG. 5 is an external perspective view of an opener of a conventional horizontal hook.

FIG. 6 is a view showing a state in which the protrusion of the inner hook is in contact with the recess of the needle plate.

FIG. 7 is an explanatory diagram showing a state in which a gap through which an upper thread passes is formed.

FIG. 8 is an explanatory diagram showing a state in which the upper yarn released from the outer hook is entangled with the opener of the horizontal hook.

[Explanation of symbols]

 1 Inner hook 2 Outer hook 3 Engagement part 6 Recessed part 7 Protrusion part 8 Anti-rotation means 11 Opener 12 Fixed body 14 Sewing needle A Horizontal hook S S upper thread

Claims (1)

[Claims] 1. An outer hook which rotatably holds an inner hook, has a sword tip on the outside, and rotates around a vertical axis, and a concave section and a convex section which is relatively movable in the concave section. And one of them is provided in the inner hook and the other is provided in the stationary portion such as the needle plate, and the rotation prevention means is elastically brought into contact with the inner hook so as to pull out between the uneven portions of the rotation prevention means. A horizontal shuttle device for a sewing machine, which comprises an opener for forming a gap through which an upper thread can pass, wherein the sewing machine is provided on the upper surface of the inner hook and at a position opposite to the sewing needle with respect to the center of the rotary shaft of the inner hook. An opener for a horizontal hook, wherein an engagement portion between the opener and the inner hook is provided.