Horizontal shuttle opening device

Abstract

Provided is an opener device for a horizontal shuttle comprising a horizontal shuttle having shuttle shaft, shuttle bed and rotary shuttle and an opening hook acting on the rotary shuttle contact portion, wherein a loop passby clearance is formed on rotary locking portion under the needle plate. It is characterized in comprising: a cam shaft rotated at a rotation speed 1 / 2 of that of a shuttle shaft; an eccentric cam provided in the upper end of the cam shaft; an opener guide arm having its one end part rotatably fitted to the eccentric cam and another end fixed on the opening hook; an opener guide link having its base end part rotatably supported to a link shaft fitted to a hook saddle and its tip part connected to the other end part of the opener guide arm. The opening hook is fixed to the other end of the opener guide arm and acting on the front end of opening hook of the rotary shuttle contact protion, and along the same direction of the revolving direction of the shuttle bed, one elliptic motion one time about two rotations of an outer shuttle is performed in direction of rotary shuttle contact portion substantially.

Description

technical field [0001] The present invention relates to an opening device of a horizontal hook (horizontal kettle), which is used for flat seaming in which the engaging projection of the hook is engaged with the stopper of the hook under the needle plate so as to keep the hook in a non-rotating state In this horizontal hook, the hook is forcibly rotated in a direction opposite to the direction of rotation of the hook bed, thereby forming a thread loop passage gap at the hook stopper. Background technique [0002] The opening device of this existing horizontal shuttle has been disclosed in Japanese Patent Application Laid-Open No. 11-114264, for example, according to the following Figure 4-Figure 8 Be explained. [0003] Such as Figure 4 and Figure 6 As shown, reference numeral 102 is a hook shaft freely rotatably supported on a hook shaft stand not shown in the figure, and at the upper end of the hook shaft 102, a hook tip 103a having a thread loop is integrally provide...

AI Technical Summary

Problems solved by technology

Originally, the shuttle was treated as a consumable, but when it becomes a dedicated shuttle, the manufacturing cost becomes higher, so using it as a consumable inevitably increases the running cost

[0016] In addition, when the hook shaft is integrated with the shuttle bed and the eccentric cam, the timing at which the front end of the opening hook acts on the contact portion of the hook cannot be changed relative to the rotation phase of the shuttle bed, and there is a problem that it is difficult to respond to changes in sewing conditions.

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