JPS63283696A - Inner hook of sewing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to an inner rotary hook of a lockstitch sewing machine, such as a vertical or horizontal fully rotary hook.

BACKGROUND ART In order to prevent the inner rotor from rotating, in the prior art, a protrusion of the rotor retainer attached to the machine body is fitted into a rotary rotor retainer, which is a recess formed at the i end of the inner rotor. The inner hook, which is supported by the outer hook to be rotated, is prevented from rotating.

Problems to be Solved by the Invention In such prior art, an undesirably large tension is applied to the needle thread when it passes through the protrusion and the detent recess of the inner hook. This makes it difficult to perform high-quality sewing.

In order to solve this problem, some types of sewing machines slightly angularly displace the inner hook toward the upstream side in the direction of rotation of the outer hook when the upper thread passes through the protrusion and the detent recess. This allows the upper thread to pass through smoothly.
Such an arrangement is known to those skilled in the art as an opener.

This prior art has a problem in that the opener has a relatively retro construction and the sewing machine is expensive.

An object of the present invention is to allow the upper thread to pass through smoothly, thereby allowing R5! The purpose of this project is to provide an inner hook for a lockstitch sewing machine that improves quality and has a simple and inexpensive structure.

Means for Solving the Problems The present invention provides a lockstitch sewing machine in which a roller is rotatably attached to the inner hook of the lockstitch sewing machine, and faces upstream in the direction of rotation of the outer hook in a recess for locking the inner hook. A lockstitch sewing machine characterized in that a protruding part that fits into a hook locking recess is protruded from a support part attached to a rotary hook, and a roller and the protruding part are brought into contact when the outer hook rotates. There is a lot inside.

Preferred implementation! ! In this case, the axis of the roller is substantially parallel to the axis of rotation of the outer hook or is characterized in that it has a predetermined angle with the axis of rotation of the outer hook.

Further, in a preferred embodiment B, the roller has a right cylindrical shape.

Furthermore, in a preferred embodiment, the material of the roller is an elastic material.

Further, a preferred embodiment is characterized in that a circular convexity is formed on the outer circumferential surface of the roller so that the needle thread can easily pass therethrough.

According to the present invention, the support portion attached to the body of the lockstitch sewing machine is formed with a protruding portion toward the inner hook that fits into the hook hook recess of the inner hook, and the protrusion portion that fits into the hook hook recess for,
Facing the upstream side in the direction of rotation of the outer hook, a roller is rotatably mounted. Therefore, the roller rotates when the upper thread passes between the outer circumferential surface of the roller and the protrusion of the support portion, and thereby the upper thread can pass smoothly. The material of the roller has elasticity, which allows the upper thread to pass more smoothly, and by forming irregularities on the outer peripheral surface of the roller, the upper thread can also pass smoothly. You will be able to do this. Therefore, even in a normal lockstitch sewing machine without an opener, the sewing quality can be improved and the construction is simplified compared to an opener.

Embodiment FIG. 1 is a perspective view of an embodiment of the present invention with the bobbin omitted, and FIG. 2 is an enlarged perspective view of a portion thereof. This vertical rotating pine hook is fixed at both ends to a rotating shaft 1 having a horizontal axis of rotation. has a tip 3 and is rotationally driven in the direction of the arrow holder 4. Inner pot 5 is stored in outer pot 2, and this inner pot! The bobbin thread is stored inside S.

At the end of the inner pot 5, a recess or a permanent stop portion 6 is formed. A roller 7 is inserted into a cylindrical recess 14 formed in the inner pot 5 facing the retaining portion 6 and supported by a pongee 8. A portion of the outer circumferential surface of the roller rough protrudes from the recess 14 into the hook stop 6.

The pongee 8 is fixed in the recess 14 of the inner hook 5. A protrusion 10 fits into the hook stop 6. The protruding part 10 is the supporting part 9
It is formed integrally with the rotary shaft 1 and is formed parallel to the axis of the rotating shaft 1 toward the inner pot 5 . The protrusion 10 has an abutment surface 13 and abuts against the outer circumferential surface of the roller luff. The support portion 9 is fixed to the body of the sewing machine.

FIG. 3 is a sectional view of the vicinity of the roller 7. The roller 7 is
It is made of an elastic material, has a right cylindrical shape, and is rotatably supported on the sleeve 8 by a ring support 11. The pongee R12 of this roller 7 is parallel to the axis of the rotating shaft 1 of the outer hook 2. 11, when the outer hook 2 is rotationally driven in the direction of the arrow i4, the contact surface 13 formed on the protrusion 6Ho of the support portion 9 comes into contact with the outer circumferential surface of the roller luff.

The upper thread passes between this contact surface 13 and the roller 7.

When this upper thread passes, the roller 7 rotates around its rotation axis m12.
It is possible to rotate or angularly displace the . This allows the upper thread to pass through smoothly and prevents undesired tension from acting on the upper thread.

The roller 7 is made of an elastic material such as rubber or plastic, so that the thread can more easily pass between the outer peripheral surface of the roller 7 and the contact surface 13.

Although the axis 12 of the roller rough was parallel to the axis of the rotary shaft 1 in the above embodiment, in another embodiment of the present invention, the axis 12 of the roller rough may be inclined diagonally upward at an angle θ1 toward the bottom side of the inner hook. , or diagonally downward I with an angle θ2
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Further, the roller 7 may be made of a rigid material.

FIG. 4 is a perspective view of a portion of another embodiment of the invention.

The roller 20 basically has a right cylindrical shape, and a large number of V-shaped grooves along the III#a of the roller 20 are formed on its outer periphery at equal intervals of ri11. This makes it easier for the upper thread to pass through.

The roller 7I20 is not limited to a right-circular shape, but may be, for example, spherical.

The present invention is applicable not only to vertical full-rotation hooks, but also to horizontal full-rotation hooks and other hooks! ! It can be implemented later and more widely.

Effects As described above, according to the present invention, a roller is attached to the hook locking recess of the inner hook, the roller is made rotatable, and the inner hook hook locking recess is provided with a protrusion formed on the support portion. Since these are fitted together, the upper thread can smoothly pass between the outer circumferential surface of the roller and the contact surface of the protrusion. Therefore, even though the opener is small, the product quality can be improved and the configuration can be simplified.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a vertical full-rotation hook according to an embodiment of the present invention;
Fig. 2 is an enlarged perspective view of the vicinity of roller 7, and Fig. 3 is an enlarged perspective view of the vicinity of roller 7.
A sectional view of the vicinity, FIG. 4 is a perspective view of a portion of another embodiment of the present invention. 1... Rotating shaft, 2... Outer hook, 3... Sword tip, 4...
...rotation direction of outer hook 2, 5...inner hook, 6...rotation stopper, 7.20...loaf, 8...sleeve, 10.
...Protruding part, 13...Contact surface agent Patent attorney Number of strokes Keiichiichi 12

Claims (5)

[Claims] (1) In the inner hook of a lockstitch sewing machine, a roller facing upstream in the direction of rotation of the outer hook is rotatably attached to the inner hook in the hook locking recess of the inner hook, and a support part attached to the body of the lockstitch sewing machine is attached. An inner hook for a lockstitch sewing machine, characterized in that a protruding portion is formed to protrude and fit into a hook stop recess, and a roller and the protruding portion are brought into contact when the outer hook rotates. (2) The lockstitch sewing machine according to claim 1, wherein the axis of the roller is substantially parallel to the rotational axis of the outer hook or has a predetermined angle with the rotational axis of the outer hook. Inner pot. (3) The inner hook of a lockstitch sewing machine according to claim 1, wherein the roller has a right cylindrical shape. (4) The inner hook of a lockstitch sewing machine according to claim 1, wherein the material of the roller is an elastic material. (5) The inner hook of a lockstitch sewing machine as set forth in claim 1, characterized in that the outer circumferential surface of the roller is formed with unevenness to facilitate passage of the upper thread.