JPS6218078U

JPS6218078U -

Info

Publication number: JPS6218078U
Application number: JP11024585U
Authority: JP
Priority date: 1985-07-18
Filing date: 1985-07-18
Publication date: 1987-02-03

Description

[Brief explanation of the drawing]

第１図〜第８図はこの考案を具体化した一実施
例を示すものであつて、第１図は下糸の検出状態
を示すミシンの部分断面図、第２図はミシンの正
面図、第３図はミシンのベツド部を示す部分平面
図、第４図は下糸検出器の斜視図、第５図は上下
両糸の検出状態を示すミシンの部分断面図、第６
図はミシンの電気ブロツク図、第７図はミシン各
部の作動位相を示す線図、第８図はフローチヤー
トである。第９図はこの考案を具体化した別の実
施例を示すものであつて、第３図相当図である。図において、２はミシン主軸、１０は加工布支
持面、１１は糸輪捕捉器、２０は送り歯、２２は
押え足（前記２０，２２により送り装置が構成さ
れている）、２３は下糸検出器としての糸張力検
出器、３０は制御手段としてのＣＰＵ、３１は記
憶手段としてのＲＯＭ、Ｔ１は上糸、Ｔ２は下糸
である。 1 to 8 show an embodiment embodying this invention, in which FIG. 1 is a partial sectional view of the sewing machine showing the bobbin thread detection state, FIG. 2 is a front view of the sewing machine, Fig. 3 is a partial plan view showing the bed section of the sewing machine, Fig. 4 is a perspective view of the bobbin thread detector, Fig. 5 is a partial sectional view of the sewing machine showing the detection state of both the upper and lower threads, and Fig. 6
The figure is an electrical block diagram of the sewing machine, FIG. 7 is a diagram showing the operating phases of each part of the sewing machine, and FIG. 8 is a flowchart. FIG. 9 shows another embodiment embodying this invention, and is a diagram corresponding to FIG. 3. In the figure, 2 is the main shaft of the sewing machine, 10 is a work cloth support surface, 11 is a thread loop catcher, 20 is a feed dog, 22 is a presser foot (the above-mentioned 20 and 22 constitute a feed device), and 23 is a bobbin thread. A thread tension detector is used as a detector, 30 is a CPU as a control means, 31 is a ROM as a storage means, T1 is an upper thread, and T2 is a lower thread.

Claims

[Scope of Claim for Utility Model Registration] As the sewing machine main shaft 2 rotates, the work cloth support surface 10
It is equipped with a needle 9 that is moved up and down across the upper work cloth W, and a bobbin 16 around which the bobbin thread T2 is wound, and for forming stitches on the work cloth W by cooperation with the needle 9. In a sewing machine having a thread wheel catcher 11 and feeding devices 20 and 22 that feed the work cloth W on the work cloth support surface 10, a lower thread detector 23 that engages with the lower thread T2 on the thread path and outputs a predetermined detection signal based on the pressure generated by the engagement; and a lower thread detector 23 that outputs a predetermined detection signal based on the pressure generated by the engagement;
A storage means 31 stores data on the tension applied to the bobbin thread T2 during the operations of 0 and 22, and compares the output level of the detection signal with the tension data, and outputs an abnormality detection signal according to the result. A sewing machine equipped with a bobbin thread detection device, characterized in that a control means 30 is provided.