JPH1033870A - Right-handed total rotation vertical shuttle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a right-handed total rotation vertical shuttle for not causing the damage of a needle in any sewing conditions by smoothly forming a range opposing a lowering needle on the surface on a needle location side of a rotating hook. SOLUTION: This right-handed total rotation vertical shuttle is provided with the rotating hook 1 provided with a sword tip 1a for catching the loop of a needle thread, the rotating hook bobbin case holder 2 of non rotation to which a bobbin thread bobbin and a bobbin case 11 are set, a rotating hook section 3 for holding and supporting the rotating hook bobbin case holder 2 there between the rotating hook 1 and a back plate 4. The rotating hook section 3 is provided with a function for detaching the needle thread from the rotating hook bobbin case holder 2 when a needle thread loop is moved around the shuttle in a stitch formation process and is provided with a pawl part 3b for hooking the needle thread and tightening the thread on a rear end in the rotating direction. In this case, the position of the mark of a dotted line circle of the rotating hook section 3, that is the range opposing the needle of the right-handedly rotated rotating hook 1, is formed into a smooth surface. Thus, the danger of hooking a needle tip when the needle is bent to a shuttle side is dissolved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an industrial sewing machine,
In particular, the present invention relates to a clockwise full-rotation vertical hook (hereinafter referred to as a DP-type hook) used in a staggered sewing machine. The rotation direction is viewed from the front, that is, from the side opposite to the needle drop side. .

[0002]

2. Description of the Related Art FIGS. 3 and 4 (1) show the structure of a DP type shuttle.
This will be described with reference to FIG.

[0003] The DP type shuttle has parts shown in FIG.
An outer hook 1 that rotates fully clockwise and has a blade point 1a, and a non-rotating inner hook 2 on which a lower thread bobbin and a bobbin case are set.
And an inner hook presser 3 fixed to the front side of the outer hook 1 and holding the inner hook 2 so as to be relatively rotatable, and a back plate 4 fixed to the back side of the outer hook 1
And more.

The inner hook retainer 3 is provided with three threaded round holes 3a, and the outer hook 1 is provided with three stepped holes 1b at positions corresponding to the screw holes 3a. I have. Then, with the inner hook 2 accommodated in the outer hook 1, the tightening screw 5 is screwed into the screw hole 3 a of the inner hook holder 3 through the stepped hole 1 b from the back of the outer hook 1, and the surface of the outer hook 1 is adjusted. The inner hook 2 is held so as to be relatively rotatable by fixing the inner hook presser 3 to the inner hook 2. In this case, the stepped hole 1b for inserting the tightening screw 5 is
Is formed on the surface on the needle drop side. The back plate 4
Is fixed to the back surface of the outer hook 1 with a tightening screw 6.

Next, the operation will be described with reference to FIG. In synchronization with the clockwise rotation of the outer hook 1, the needle 7 descends to the back side of the blade point 1a when viewed from the front of the hook. The needle thread 1a catches the needle thread loop 9 formed when the needle 7 is lifted while being stuck in the cloth 8. Then, the captured needle thread is rotated once around the hook, so that the needle thread 9 and the lower thread 10 are entangled to form a seam.

[0006]

When the needle 7 is lowered, the position of the outer hook 1 facing the needle 7 is, as shown in FIG. 4 (2), just by tightening the inner hook presser 3 at the forefront in the rotation direction. Screw 5
Is near where one of them exists. That is, the needle point is
As shown in (3), it approaches the tightening screw 5 or the stepped hole 1b. If the thread touches the tightening screw 5, the thread may break, so the tightening screw 5 is embedded in the stepped hole 1 b. Therefore, when the sewing machine is operated at a high speed, the needle oscillates or the needle tip is bent due to resistance of a sewing product or the like, and enters the stepped hole 1b.
The needle point may contact the tightening screw 5 or the stepped hole 1b. Further, the needle point may contact the tightening screw 5 or the stepped hole 1b depending on the adjustment position of the needle swing width, the needle swing baseline position, the pattern sewing cam and the needle bar height. As a result, the needle tip may be damaged and bent to damage the cloth, or the needle tip may be crushed and the penetration force into the cloth may be reduced. In order to prevent such problems, when sewing under conditions where needle bending is likely to occur, it is necessary to use a rigid needle and reduce the rotation speed of the sewing machine, which takes extra time and reduces sewing efficiency. Problem.

An object of the present invention is to provide a clockwise full-rotation vertical hook that does not cause damage to the needle under any sewing conditions.

[0008]

A clockwise full-rotation vertical hook according to the present invention comprises a needle 7 descending on the needle drop side surface of the outer hook 1.
Is smoothed in a range facing the above.

The screw hole 3a is not provided in the area of the inner hook presser 3 which faces the descending needle 7.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. 1 and 2, an embodiment of a clockwise full rotation vertical shuttle according to the present invention will be described.

The basic members of this clockwise full-rotation vertical shuttle are the same as those of the prior art, and the corresponding members are denoted by the same reference numerals as in the conventional example.

That is, the clockwise full-rotation vertical shuttle has the outer shuttle 1 having the blade tip 1a for fully rotating clockwise and capturing the loop of the upper thread, the lower thread bobbin and the bobbin case 11. By fixing the inner shuttle 2 to the non-rotating inner shuttle 2 and the front side of the outer shuttle 1, an inner shuttle retainer (runway retainer) 3 that supports the inner shuttle 2 between the outer shuttle 1 and the rear side of the outer shuttle 1. It is composed of a fixed back plate 4.

The inner hook presser 3 has a function of removing the upper thread from the inner hook 2 when the upper thread loop passes around the hook in the seam forming process. FIG.
As shown in (1), the claw portion 3 on which the upper thread is hooked and tightens the thread.
b.

As shown in FIG. 2A, the inner hook retainer 3 has two round holes 3a formed with female threads. The inner hook retainer 3 has a hole 3 as shown in FIG.
The outer hook 1 is fixed to the front side of the outer hook 1 by screwing the tightening screw 5 into the outer hook 1.

The position indicated by a dotted line of the inner hook presser 3 is
This is the position where the hole was formed in the conventional product. However, in the present invention, no hole is intentionally formed in this portion. That is, when the needle 7 descends to the back side of the blade point 1a, a concave portion for screwing the tightening screw 5 is prevented from being formed in a range facing the needle 7 of the outer shuttle 1 rotating clockwise. In other words, when the needle 7 descends, a concave surface or a convex portion is not formed in a range of the outer shuttle 1 facing the needle 7 and a smooth surface is formed.

Thus, even if the round hole 3a is reduced by one, since the inner hook retainer 3 is a small part, the fixing strength can be sufficiently secured. If still unsatisfactory, the distance between the two round holes 3a may be made wider than the conventional one.

As described above, when the needle 7 descends, if the concave surface or the convex portion is not formed in the area of the outer hook 1 on the needle drop side facing the needle 7 and a smooth surface is formed, the sewing machine operates at high speed. Even when the needle 7 may bend toward the shuttle at the time or the like, there is no portion where the needle tip is caught or collides with the needle 7 of the outer shuttle 1, so that the needle 7 is It will not break.

[0018]

Since the present invention is configured as described above, it has the following effects.

That is, since the area of the outer hook facing the needle drop side on the needle drop side is made smooth, the needle is damaged even if the needle is bent toward the hook during high-speed operation of the sewing machine or the like. Things are gone. Therefore, the fabric is not damaged and the penetrating power to the fabric is not reduced, and the workability of the operator is further improved. Further, the processing cost can be reduced by reducing the number of screw holes of the inner hook retainer.

[Brief description of the drawings]

FIG. 1 is a view of a DP type shuttle of the present invention, (1) is a front view, and (2) is a plan view.

FIGS. 2A and 2B are diagrams showing an inner hook retainer of a DP type hook of the present invention, wherein FIG. 2A is a plan view of the inner hook retainer, FIG. 2B is a rear view showing an attached state thereof, and FIG. is there.

FIG. 3 is a perspective view of each component constituting a conventional DP type shuttle.

FIG. 4 is a diagram relating to an inner hook retainer of a conventional DP type shuttle, (1) is a plan view of the inner hook retainer, (2) is a rear view showing an attached state thereof, and (3) is a side view thereof. .

FIG. 5 is a front view for explaining a stitch forming process in the DP type shuttle.

[Explanation of symbols]

 1 Outer hook 1a Sword point 2 Inner hook 3 Inner hook retainer 3a Round hole 3b Claw 4 Back plate 5 Tightening screw 7 needle

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] April 14, 1997

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

FIG. 2

FIG. 5

FIG. 3

FIG. 4

Claims (1)

[Claims] 1. A clockwise full-rotation vertical shuttle in which the area facing the descending needle on the needle drop side surface of the outer shuttle is smoothened.