JPS62123781U

JPS62123781U -

Info

Publication number: JPS62123781U
Application number: JP1140786U
Authority: JP
Priority date: 1986-01-29
Filing date: 1986-01-29
Publication date: 1987-08-06

Description

[Brief explanation of the drawing]

第１図は実施例のミシンに主要な制御回路を付
加して示す略体正面図、第２図はミシンの部分拡
大斜視図、第３図は糸調子器部分の拡大断面図、
第４図はこの実施例のミシンの制御回路を示すブ
ロツク図、第５図は針、天秤、送り歯等の作動曲
線と糸解放及び糸挾持信号との関係を示すグラフ
、第６図ａ，ｂは糸解放及び糸挾持に対応した電
磁石の磁化状態を示す略体側面図、第７図は主と
して糸解放及び糸挾持動作を示すフローチヤート
、第８図は糸解放期間の設定動作のサブルーチン
を示すフローチヤートである。１４……針、１５……針糸供給源としての針糸
ボビン、１９……糸調子器、２０……天秤、２１
……糸輪捕捉器、３２……第１の電磁石、３３…
…第２の電磁石、３２ａ，３３ａ……吸引部、３
７……糸挾持部体としてのヨーク部、４０……支
軸、４１……糸調子板、５１……制御手段を構成
するＣＰＵ。 FIG. 1 is a schematic front view showing the sewing machine of the embodiment with the main control circuit added, FIG. 2 is a partially enlarged perspective view of the sewing machine, and FIG. 3 is an enlarged cross-sectional view of the thread tension regulator.
Fig. 4 is a block diagram showing the control circuit of the sewing machine of this embodiment, Fig. 5 is a graph showing the relationship between the operating curves of the needle, thread take-up, feed dog, etc., and the thread release and thread clamp holding signals; b is a schematic side view showing the magnetization state of the electromagnet corresponding to yarn release and yarn clamping; FIG. 7 is a flowchart mainly showing the yarn releasing and yarn clamping operations; and FIG. 8 is a subroutine for setting the yarn release period. This is a flowchart. 14... Needle, 15... Needle thread bobbin as a needle thread supply source, 19... Thread tension device, 20... Balance, 21
... Thread ring catcher, 32 ... First electromagnet, 33...
...Second electromagnet, 32a, 33a...Suction part, 3
7... Yoke part as thread clamp holding body, 40... Support shaft, 41... Thread tension plate, 51... CPU constituting control means.

Claims

[Claims for Utility Model Registration] 1. Needle thread T1 and bobbin thread T2 are separated by feeding the fabric while picking up the needle thread loop that has passed along the circumference of the inner hook of thread loop catcher 21 with thread take-up 20. In a sewing machine that forms stitches by knotting in cloth, a thread clamp is provided at a predetermined interval between the needle thread supply source 15 and the needle 14, with the suction parts 32a and 33a facing each other. a pair of electromagnets 32 and 33 for use and release; a support shaft 40 extending in a direction intersecting the yarn passing direction between the electromagnets 32 and 33; In order to clamp the needle thread T1 between the thread tension plate 41 which is attracted and moved by the excitation of thread tension plates 32 and 33, the thread tension plate 41 and the thread clamp holding electromagnet 32 are connected to each other.
a thread clamping member 37 provided between the
3. A thread tension device for a sewing machine, characterized in that a control means 51 for controlling the excitation timing of No. 3 is provided. 2. The control means 51 releases the needle thread T1 from being held by the thread tension plate 41 and the thread holding member 37 during a period in which the needle thread T1 is paid out from the thread supply source 15 side for stitch formation. At the same time, during other periods, each electromagnet 32 is configured to clamp the needle thread T1.
, 33. The thread tension device for a sewing machine according to claim 1, wherein the thread tension device is adapted to control the excitation timing of the sewing machine.