JPH0376576U

JPH0376576U -

Info

Publication number: JPH0376576U
Application number: JP13879389U
Authority: JP
Priority date: 1989-11-30
Filing date: 1989-11-30
Publication date: 1991-07-31

Description

[Brief explanation of drawings]

第１図は本考案の１実施例の水平釜を設けたミ
シンの一部概略構成図、第２図は第１図のクラン
プ開放ソレノイドを動作する本考案の１実施例の
下糸クランプ開放装置のブロツク図、第３図は第
２図の装置の動作を説明するフローチヤート、第
４図は第２図の装置の動作を説明するタイミング
チヤート、第５図は従来の水平釜を設けたミシン
の概略構成図、第６図は第５図の水平釜の部分の
平面図、第７図は従来の下糸クランプ開放装置の
概略説明図である。９……下軸、１１……水平釜、１２……釜軸台
、１４……動メス、１５……固定メス、１６……
下糸、１７……クランプばね、１８……クランプ
開放ソレノイド、１９……プツシユロツド、２０
……ねじ、２１……釜軸、２２，２３……ギヤ、
２４……ＣＰＵ、２５……速度発電機、２６……
上下位置検出器、２７……ペダル。 Fig. 1 is a partial schematic diagram of a sewing machine equipped with a horizontal hook according to an embodiment of the present invention, and Fig. 2 is a bobbin thread clamp release device according to an embodiment of the present invention that operates the clamp release solenoid of Fig. 1. 3 is a flow chart explaining the operation of the device shown in FIG. 2, FIG. 4 is a timing chart explaining the operation of the device shown in FIG. 2, and FIG. 5 is a sewing machine equipped with a conventional horizontal hook. 6 is a plan view of the horizontal shuttle portion of FIG. 5, and FIG. 7 is a schematic explanatory diagram of a conventional bobbin thread clamp release device. 9... lower shaft, 11... horizontal hook, 12... hook shaft stand, 14... moving knife, 15... fixed knife, 16...
Lower thread, 17... Clamp spring, 18... Clamp release solenoid, 19... Push rod, 20
... Screw, 21 ... Hook shaft, 22, 23 ... Gear,
24... CPU, 25... Speed generator, 26...
Vertical position detector, 27...pedal.

Claims

[Scope of utility model registration request]

A bobbin thread holding device that holds the cut end of the bobbin thread on the supply source side until a predetermined period of time has elapsed before starting the next stitch, and then releases it. The device includes a position detection means for detecting a specific rotational angular position of the spindle, and the position detection means moves forward by detecting a specific rotational angular position of a preset plurality of rotations of the spindle. A driving means having a movable member that returns by detecting a rotational angular position; and a driving means that allows the lower thread to be clamped in cooperation with the movable knife by forward movement of the driving means, and to release the lower thread by returning. A lower thread holding device for a sewing machine, comprising a clamp member supported by a movable member.