JPS5920228Y2 - Sewing machine outer hook - Google Patents

Description

[Detailed Description of the Invention] (Technical Field) The present invention relates to a sewing machine, and particularly to an outer hook of a horizontal full-rotation hook type sewing machine in which the outer hook fully rotates around a vertical axis.

(Prior Art) When sewing a highly stretchable fabric using a conventional sewing machine, skipped stitches often occur.

To explain the cause of this using the horizontal full-rotation hook type sewing machine shown in FIGS. 1 and 2, when the needle 1 descends and pierces the highly elastic fabric 2, as shown in The penetrating portion 2a is pushed into the needle drop hole 3a of the needle plate 3,
Further, when the needle 1 rises from the lowest point and the needle 1 intersects with the thread ring catching part 5a of the outer hook 5, the needle penetrating part 2a of the fabric 2 is caused by friction with the needle 1, as shown in the second figure. It is pulled upward from the top surface of the plate 3.

Due to such a phenomenon, the thread loop 4a of the upper thread 4 is hardly formed, and as a result, the thread loop 4a cannot be captured by the thread loop catching section 5a of the outer hook 5, resulting in skipped stitches.

(Purpose) The present invention was devised to eliminate the above-mentioned drawbacks, and aims to prevent skipped stitches when sewing highly elastic fabrics by providing two thread loop catchers on the outer hook. That is.

(Example) Examples of the present invention will be described below with reference to FIGS. 3 to 9.

Note that the same parts as those explained in FIGS. 1 and 2 are designated by the same reference numerals.

Reference numeral 6 denotes a hook shaft which is vertically supported on a bed machine frame (not shown) and is fully rotated by a gear mechanism 7 (only a portion is shown); 8 is fixed perpendicularly to the upper end of the hook shaft. A cylindrical outer pot 9 is an inner pot 11 having a flange portion 9a fitted into a circular inner pot sliding surface 10 formed on the inner peripheral surface of the outer pot.
Reference numeral 12 refers to an inner pot rotation stopping device which restricts movement of the inner pot 9 in the rotational direction by alternately engaging engaging elements 11a with a pair of engagement grooves 9b formed on the upper surface of the inner pot; The bobbin is fitted into a circular hole 9C formed in the inner pot 9 with its upper surface open.

To explain in detail the outer pot 8 according to the present invention, 13 is the outer pot 8.
The first thread ring catching part 13a is formed by cutting out a part of the outer circumferential surface of the first thread ring catching part, and 13a is a first stripe formed in a tapered manner at its tip, and the stripe reciprocates in the vertical direction inside the first thread ring capture part 13a. It is arranged with a slight gap from the moving needle 1 (see Fig. 6).

Reference numeral 14 denotes a second thread ring catcher fixed to the outer circumferential surface of the outer hook 8 with a screw 15 with a gap between the outer circumferential surface of the first thread ring catcher 13, and 14a is formed tapered at the tip thereof. The second stripe 13a is rotated in the direction of rotation of the first stripe 13a (the third
counterclockwise in FIG. There is.

Reference numeral 16 denotes a thread ring holder formed on the outer peripheral surface of the outer hook 8 between the first and second thread ring catching portions 13 and 14 so as to be inclined forwardly downward from the upper surface with respect to the rotational direction of the outer hook 8. It's a groove.

(Function) The present invention is constructed as described above, and to explain its function, when sewing a highly stretchable fabric,
As shown in Figure 5, the second stripe 14 rises from the bottom dead center of the needle 1.
At the time when the thread a intersects the needle 1, the thread loop 4a is hardly formed in a state similar to that shown in FIG. There are many.

However, the needle 1 further rises and the first stripe 13 appears as shown in the sixth figure.
At the time when a intersects the needle 1, the thread ring 4a becomes larger than the state shown in FIG. A capture of the ring 4a takes place.

In this case, the thread ring 4a captured by the first light strip 13a is located at a position where the second light strip 14a is slightly lower than the first light strip 13a, as shown in FIG. Since it is located at a position lower than the lower surface of the flange portion 9a, the thread can be smoothly removed from the inner hook 9.

Figure 7 shows the first strip 13a, and Figure 8 shows the second strip 13a.
4a shows the relationship between the thread ring holding groove 16 and the thread ring 4a immediately after each thread ring 4a is captured, and the thread ring 4a is engaged with the thread ring holding groove 16 in any case. The seams are stable.

(Effects) As described above, the present invention has a cylindrical outer hook that makes full rotational movement, and a circular inner hook sliding surface formed on the top surface of the outer hook that is fitted with the rotational movement restricted. In a sewing machine hook mechanism consisting of an inner hook, the outer hook is formed by cutting out a portion of the outer circumferential surface of the outer hook, and a needle that reciprocates vertically inside the outer hook is disposed at the tip with a slight gap. It is fixed to the outer peripheral surface of the outer hook with a gap between the first thread ring catching part forming the first thread light and the outer peripheral surface of the second thread ring catching part, and the first thread ring catching part is fixed to the outer circumferential surface of the outer hook. A second strip of light was formed at a position slightly lower than the light, in front of the first strip of light in the direction of rotation, and at the same distance from the circular center of the outer pot as the first strip of light. The present invention provides an outer hook for a sewing machine, which is equipped with a second thread loop catcher.

Therefore, according to the present invention, when sewing ordinary cloth, the thread loop is captured by the second light stripe and normal sewing is performed.

In addition, since the second striped light is arranged at a position lower than the first striped light in the vertical direction, the thread caught by the first striped light can be smoothly removed from the inner hook. .

Furthermore, the first striped light and the second striped light are arranged on the same circumference in the radial direction, and the first striped light is located further back than the second striped light in the rotational direction. Therefore, when sewing a highly stretchable fabric, even if the second striped light cannot capture the thread loop, the first striped light can capture the thread loop. This is an extremely great idea as it can completely eliminate sewing problems such as skipped stitches that frequently occur when sewing highly stretchable fabrics, and contributes to improved sewing performance.

[Brief explanation of the drawing]

Figures 1 and 2 are explanatory diagrams showing the relationship between the conventional outer hook and thread loop when sewing highly stretchable fabrics, and Figures 3 to 9 show examples of the present invention. , Fig. 3 is a perspective view showing a part of the sewing machine with an outer hook attached, Fig. 4 is a partially exploded perspective view of Fig. 3, and Figs. 5 and 6 are external views when sewing highly elastic fabrics. An explanatory view showing the relationship between the hook and the thread ring, Figs. 7 and 8 are explanatory views showing the relationship between the thread ring and the thread ring holding groove, and Fig. 9 is an explanatory view showing the state of thread removal from the thread ring. It is. In the figure, 8 is an outer hook, 9 is an inner hook, 10 is an inner hook sliding surface of the outer hook,
Reference numeral 13 denotes a first thread ring catcher, 13a a stripe of the catcher, 1
Reference numeral 4 denotes a second yarn ring catcher, and 14a denotes a stripe of the catcher.

Claims (1)

[Scope of utility model registration request] A cylindrical outer hook 8 that makes full rotational movement, and an inner hook 9 that is fitted with a circular inner hook sliding surface 10 formed on the upper surface of the outer hook and whose movement in the rotational direction is restricted. In the lid mechanism of a sewing machine, a first strip is formed by cutting out a part of the outer circumferential surface of the outer hook 8, and is disposed at the tip portion with a slight gap from the needle 1 that reciprocates in the vertical direction inside the hook. It is fixed to the outer peripheral surface of the outer hook 8 with a gap between the first thread ring catching part 13 forming the light 13a and the outer peripheral surface of the second thread ring catching part, and the first thread ring catching part 13 is fixed to the outer circumferential surface of the outer hook 8 at the tip. The striped lights 13a) are placed in front of the rotational direction of the first striped light 13a at a slightly lowered position and at the same distance from the circular center of the outer hook 8 as the first striped light 13a. The second light 14
An outer hook of a sewing machine is provided with a second thread loop catcher 14 formed with a.