THREADER FOR OVERLOCK MACHINE

摘要

Provided is a threader for an overlock machine that allows the whole machine to be made compact and allows an operator to carry out threading reliably with one hand. The threader comprises: a threading shaft that moves vertically and is supported rotatably, with a shaft core being taken as a central axis; a threading hook that is fixed to the lower end of the threading shaft and that includes a hook part that can be inserted into the needle eye of a sewing needle and a first guide part that guides the hook part to the needle eye; and a thread guide member that guides a needle thread to the hook part in the vicinity of the descent limit point of the threading shaft. The threading hook is rotated by a predetermined angle so that the hook part is inserted into the needle eye of the sewing needle in the vicinity of the descent limit point of the threading shaft. The threading hook and the thread guide member are rotated in opposite directions to each other and thereby the thread guide member is rotated by the predetermined angle so that the thread hooking part intersects the sewing needle beyond the position of the sewing needle in the vicinity of the descent limit point of the threading shaft. The threading shaft moves according to the relative positional relationship between the needle eyes of a plurality of sewing needles.

主权项

1. A threader for an overlock machine, comprising:
a threading shaft that is located near a needle bar, which collectively and vertically moves a plurality of sewing needles attached thereto, that can move in substantially parallel with a direction of vertical motion of the needle bar, and that is supported rotatably, with the direction of vertical motion of the needle bar being taken as a rotation axis; a threading hook that is fixed to a lower end of the threading shaft and that includes a hook part, which can be inserted into a needle eye of a sewing needle and a first guide part for guiding the hook part to the needle eye; a first rotary mechanism that rotates the threading hook by a predetermined angle so that the hook part is inserted into the needle eye of the sewing needle in a vicinity of a descent limit point of the threading shaft; a thread guide member that has a thread hooking part for hooking a needle thread and a second guide part for guiding the needle thread hooked on the thread hooking part towards the needle eye of the sewing needle and that guides the needle thread to the hook part in the vicinity of the descent limit point of the threading shaft; and a second rotary mechanism that rotates the thread guide member by the predetermined angle so that the thread hooking part intersects the sewing needle beyond the position of the sewing needle in the vicinity of the descent limit point of the threading shaft, wherein the first rotary mechanism and the second rotary mechanism rotate the threading hook and the thread guide member in opposite directions to each other, and the threading shaft moves according to a relative positional relationship between the needle eyes of the plurality of sewing needles.