JPS6141673U

JPS6141673U - Sewing machine needle thread supply device

Info

Publication number: JPS6141673U
Application number: JP16253184U
Authority: JP
Inventors: 享松原; 庸太郎平川; 正好大木
Original assignee: ジューキ株式会社
Priority date: 1984-10-26
Filing date: 1984-10-26
Publication date: 1986-03-17
Also published as: JPH0232226Y2

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図は本考案装置を備えたミシンの正面図、第２図は
電気回路のブロック図、第３図は釜曲線及び天秤曲線と
繰出し制限体及び糸把持器との関係を示した説明図であ
る。Fig. 1 is a front view of a sewing machine equipped with the device of the present invention, Fig. 2 is a block diagram of the electric circuit, and Fig. 3 is an explanatory diagram showing the relationship between the hook curve, the thread take-up curve, the feed limiter, and the thread gripper. It is.

Claims

[Scope of claim for utility model registration] In a sewing machine that intertwines upper and lower threads through the cooperation of a needle, hook, and thread take-up that are linked to the main shaft, the feed corresponds to the parallel movement distance along the top surface of the bed of the feed dog that is linked to the main shaft. A cloth feed pitch detector 19 that generates a pitch signal; a cloth thickness detector 24 that detects the flying distance of the workpiece from the top surface of the bed of the presser foot and generates a cloth thickness signal corresponding to that distance; A feed-out restricting body 11 disposed on the needle thread path between the needle thread supply sources and capable of acting on the needle thread to allow and prevent the needle thread from being fed from the needle thread supply source to the thread take-up; and the needle thread path between the needle and thread take-up. a thread gripper 14 disposed above and operable to act on the upper thread to permit and prevent passage of the upper thread; and a thread take-up and upper thread supply rotatable in relation to feeding of the upper thread from the supply source to the thread take-up. Rotating body 10 placed on the needle thread path between the sources
and a payout detector 9 consisting of a detector 21 that detects the rotation of the rotating body and generates a yarn signal every time the rotating body rotates at a specific angle, and a feed-out detector 9 that counts the yarn signal and calculates the counted value. A counter 23 that outputs a corresponding signal, and a hook position detector 2 that detects the rotational angular position of the main shaft of the sewing machine and generates a thread dropout signal from the hook of the upper thread loop on the hook curve.
2, a storage means 23 which calculates the amount of needle thread payout required to intertwine the upper and lower threads with a cloth based on the feed pitch signal and the cloth thickness signal, and stores the calculation result as numerical information; and a counter. A comparator 2j that compares the counted value with information stored in the storage means and generates a stop signal when the two values match; and a comparator 2j that generates a stop signal when the two values match; The upper thread starts to be allowed to be fed from the supply source to the take-up lever until the intertwining point of the upper thread and the lower thread is pulled up by the thread take-up to the position where it touches the bottom surface of the fabric, and in response to the stop signal of the comparator, A control circuit 23 that prevents the thread from being let out and prevents the needle thread from passing while the thread gripper allows the needle thread to be let out after the stitch is in a hanging state and the let-out limiter allows the needle thread to be let out.
, needle thread supply device for a sewing machine.