Needle thread feeding device of sewing machine

Abstract

A sewing machine which comprises a needlework leading out device is suitable for the flat-seam machine and the like, the needle stick (3) traverses the crank mechanism and is supported at the front end of the sewing machine arm part (1) while doing reciprocating motion in the up-and-down direction, and the up-and-down reciprocating motion range of the needle stick (3) is set that the upper end part of the needle stick (3) does not extend upwards from the upper wall part (1A) at the front end part of the sewing machine arm part (1) even the needle stick (3) ascends to the dead point. With thisstructure the needlework channel which synchronously does up-and-down motion with the needle stick can be eliminated from the upper end part of the needle stick, the sewing machine arm part can be basically realized with enclosing and the intrusion of leaked oil and dust can be prevented, and with the realization of shortening and lighting of the needle stick length the high speed of the sewing velocity can be easily adapted.

Description

[0001] The present invention is a divisional application with an application number of 03130778.7, an application date of April 30, 2003, and an invention title of "Sewing Machine Needle and Thread Lead-out Device". Technical field [0002] The present invention relates to a sewing machine with a needle thread lead-out device mainly suitable for a multi-needle flat chain sewing machine, and in particular to a sewing machine with a needle thread lead-out device having the following components, namely, including: a crank mechanism and a penetrating support in the arm of the sewing machine A needle bar supported by the front end of the arm of the sewing machine in linkage with the driving spindle and capable of reciprocating up and down directions; a needle installed at the lower end of the needle bar; contained in the bottom of the sewing machine, including looping and grey cloth feeding mechanisms The sewing member at the front end of the needle; the thread regulator that adjusts t...

AI Technical Summary

Problems solved by technology

[0004] However, in the above-mentioned conventional sewing machine with the needle thread lead-out device, in order to fix the needle thread passage, since at the upper wall portion, there is formed the upper end portion of the needle bar to extend upwards from the upper wall portion of the sewing machine arm front end. Therefore, not only the possibility of oil leakage and dust intrusion into the arm of the sewing machine will occur from the through hole, but also because the needle thread passage protruding upward performs high-speed up-and-down reciprocating motion, in terms of safety for operators, etc. It's not good to see

In addition, due to the lengthening of the needle bar, and the increase in the weight of the needle bar caused by the fixing of the needle thread channel, it will naturally hinder the high-speed sewing speed.

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