JPH0355078U

JPH0355078U -

Info

Publication number: JPH0355078U
Application number: JP11453789U
Authority: JP
Priority date: 1989-09-29
Filing date: 1989-09-29
Publication date: 1991-05-28
Anticipated expiration: 2004-09-29
Also published as: JPH0727021Y2

Description

[Brief explanation of drawings]

第１図はこの考案の一実施例を示す分解斜視図
、第２図ａは同実施例における可動刃、固定刃、
板ばね及びピツカの取付け状態を示す平面図、同
図ｂは同図ａに示したものの側面図、同図ｃは同
図ｂに示したものの底面図、第３図は同実施例に
おける要部拡大斜視図、第４図ａ〜ｆは同実施例
における可動刃及びピツカの動作状態を示す説明
斜視図、第５図は同実施例における上糸切断時の
状態を示す説明側面図、第６図は同実施例におけ
るワイパの動作状態を示す斜視図である。図において、１……ミシン釜、４……ボビンケ
ース、４ａ……長溝、８……可動刃、８ｂ……刃
部、１０……固定刃、１０ａ……刃部、１６……
ピツカ（上糸引出し部材）、１６ａ……糸掛け部
、１……上糸ループ、Ｌ……針落位置の延長線
、２１……ワイパ（糸払い部材）。 Fig. 1 is an exploded perspective view showing one embodiment of this invention, and Fig. 2a shows the movable blade, fixed blade, and
A plan view showing the attached state of the leaf spring and the picker, Figure b is a side view of the thing shown in Figure a, Figure c is a bottom view of the thing shown in Figure b, and Figure 3 is a main part of the same embodiment. FIG. 4 is an enlarged perspective view, FIG. The figure is a perspective view showing the operating state of the wiper in the same embodiment. In the figure, 1... Sewing machine pot, 4... Bobbin case, 4a... Long groove, 8... Movable blade, 8b... Blade section, 10... Fixed blade, 10a... Blade section, 16...
Picker (needle thread pull-out member), 16a... thread hooking section, 1... needle thread loop, L... extension line of needle drop position, 21... wiper (thread removal member).

Claims

[Scope of Claim for Utility Model Registration] A movable device that is provided at an intermediate position between the throat plate and the sewing machine hook, and moves in a reciprocating path that crosses the extension line of the needle drop position from an initial position that is horizontally retracted from the needle drop position. a fixed blade having a blade portion that slides into contact with the blade portion of the movable blade in the initial position; and a leaf spring that is joined to one surface of the movable blade, and the movable blade moves in response to a predetermined thread cutting command. By reciprocating the position and forming one stitch with the lockstitch sewing machine needle and sewing machine hook, the movable blade captures the bobbin thread and the needle thread loop formed on the underside of the needle thread, and both threads are separated. In a thread cutting device for a lockstitch sewing machine, which cuts the thread between a movable blade and a leaf spring and simultaneously holds both cut thread ends between the movable blade and the leaf spring, the bobbin is installed in the sewing machine hook. A non-contact part with the upper thread loop is formed on the front surface of the case, and a hook-shaped threading part that can be fitted into the stepped part is provided at the tip, and the threading part is connected to the reciprocating movement of the movable blade. an upper thread pull-out member that reciprocates from a side of the sewing machine hook to a position where it is inserted into the non-contact part; The needle thread loop is captured by the hooking section and pulled out to the side of the sewing machine hook by the backward movement of the threading section, and is pulled out from the movable blade in synchronization with the completion of the backward movement of the movable blade. A thread removing member is provided that moves across the upper thread path leading to the needle, and the upper thread pulled out at the thread hooking portion of the upper thread pulling member is removed by the thread removing member. Thread cutting device for lockstitch sewing machines.