Horizontal bobbin case of sewing machine

Abstract

A horizontal rotating shuttle of sewing machine having a shuttle hook point, provided on a rotating hook accommodating a rotating hook bobbin case holder rotatably about an axis, tapered along an axial rotational direction of the rotating hook, and a needle guard having a shape distorted along the axial rotational direction, with one end fixed to the rotating hook and the other end as a free end. Adjustment means adjustably displaces the needle guard in a direction to increase / reduce an outer diameter of the rotating hook. In a case where the horizontal rotating shuttle is mounted in a sewing machine, and the clearance between a needle which reciprocates in a vertical direction while holding a needle thread and the needle guard of the rotating hook becomes outside an appropriate range, the adjustment means displaces the needle guard in the direction to increase the outer diameter of the rotating hook or in the direction to reduce the outer diameter of the rotating hook. Thus the clearance between the needle and the needle guard can be adjusted to a value within the appropriate range.

Description

technical field [0001] The invention relates to a horizontal bobbin case of a sewing machine. Background technique [0002] Until now, as one of the rotary bobbin cases for sewing machines, a horizontal bobbin case that does not take in and out a bobbin case is well known. The horizontal bobbin case of such a sewing machine can rotate on a horizontal rotation surface with respect to a needle moving up and down in a vertical direction. The needle is provided with a hole through which the upper thread can pass. [0003] Here, referring to Figure 8- Figure 11 The structure of the horizontal bobbin case of the conventional sewing machine is demonstrated. Fig. 8 is a front view showing a horizontal bobbin case of a conventional sewing machine, Figure 9 It is a top view showing a horizontal bobbin case of a conventional sewing machine. The horizontal bobbin case 1 of the sewing machine has an outer shell 2 and an inner shell 3 etc., and the inner shell 3 is accommodated in a...

AI Technical Summary

Problems solved by technology

[0018] However, in the method of adjusting the position of the needle stopper by changing the tightening amount of the adjustment screw, because the position of the adjustment screw is away from the position where the needle and the needle stopper are opposite, and because the needle stopper is in a single-end fixed state, it is difficult to Achieve high adjustment accuracy

In addition, because it is fixed at one end, the needle retaining part is easily bent and deformed by external force during sewing.

[0019] Furthermore, as mentioned above, in the method of adjusting the stopper part by rotating the eccentric cam, the adjustment mechanism is complicated and the cost is high, and the bobbin and the inner casing, etc. stored in the outer casing must be removed for the adjustment, which is troublesome to operate. inconvenience

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