Inner shuttle of rotating shuttle of sewing machine and manufacturing process thereof

Abstract

The invention discloses an inner shuttle of a rotating shuttle of a sewing machine, which is a complete body formed through a die by adopting the metal power injection molding technology. A first filleted corner (R1) is arranged at the joint of a sub-line hook (10) at a pressing line groove (7) and the circumferential surface of an annular side wall (2); a second filleted corner (R2) is arranged at the joint of a positioning handle (11) and the circumferential surface of the annular side wall (2). The manufacturing processes of the inner shuttle comprise blank making, turn milling, polishing and heat treatment, among which the blanking making process comprises the steps of mixing, injecting, forming, degreasing, sintering and finally obtaining the blanks. According to the inner shuttle of the rotating shuttle of the sewing machine and the manufacturing process thereof, the power of an adopted electromagnetic component is reduced, so that the cost of equipment is reduced; besides, the acting force for opening a valve is smaller, so that the length of an operating rod can be shortened, the size of an overall bottle valve is correspondingly reduced, and the structure of the valve is more compact.

Description

technical field [0001] The invention relates to the technical field of sewing machine accessories, in particular to an inner shuttle of a sewing machine rotary hook and a manufacturing process thereof. Background technique [0002] The rotary hook of the sewing machine is one of the parts of the sewing machine, which includes the inner shuttle and the outer shuttle. Such as figure 1 with figure 2 As shown in , in the prior art, the inner shuttle is machined, and it is composed of a bottom plate 02 and a side wall 01 connected as one, and the opening of the side wall 01 has an outwardly turning hook 03 and a positioning handle 05, and there is a concave crimping groove 04 inside the side wall 01 at the line dividing hook 03, so the thickness of the side wall 01 at the line dividing hook 03 is relatively thin. When the outer peripheral surface of 01 is cut inwardly, the angle θ between the connection between the branching hook 03 and the positioning handle 05 and the outer...

AI Technical Summary

Problems solved by technology

like figure 1 and figure 2 As shown in , in the prior art, the inner shuttle is machined, and it is composed of a bottom plate 02 and a side wall 01 connected as one, and the opening of the side wall 01 has an outwardly turning hook 03 and a positioning handle 05, and there is a concave crimping groove 04 inside the side wall 01 at the line dividing hook 03, so the thickness of the side wall 01 at the line dividing hook 03 is relatively thin. When the outer peripheral surface of 01 is cut inwardly, the angle θ between the connection between the branching hook 03 and the positioning handle 05 and the outer peripheral surface of the side wall 01 is a right angle, so that the connection between the branching hook 03 and the side wall 01 is prone to breakage

In addition, the same problem also exists at the positioning handle 05, and the connection between the positioning handle 05 and the side wall 01 is also prone to breakage

[0003] The inner shuttle of the existing sewing machine rotary hook is generally made by turning and milling processes, the manufacturing process is complicated, the cost is high, and the quality is unstable

Therefore, the technology of powder metallurgy is also used in the prior art to manufacture. However, traditional powder metallurgy products are not easy to form parts with thin walls and complex structures due to the uneven material and low mechanical properties of the finished products. Therefore, It is not suitable for the complex structure and thin-walled parts of the inner shuttle in the sewing machine hook

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