JPH0449073U

JPH0449073U -

Info

Publication number: JPH0449073U
Application number: JP8978290U
Authority: JP
Priority date: 1990-08-28
Filing date: 1990-08-28
Publication date: 1992-04-24
Anticipated expiration: 2005-07-12
Also published as: JPH0729979Y2

Description

[Brief explanation of the drawing]

第１図および第２図は、この考案に係るミシン
の糸切断装置の一実施例を示す図で、第１図は、
ミシンの糸切断装置を示す図で、同図ａは平面図
、同図ｂは同図ａにおける、駆動メスと下糸保持
体とを示す平面図、第２図は、ミシンの糸切断装
置の作用を示す説明図で、同図ａは、下糸の切断
時を示す説明図、同図ｂは、下糸切断後の下糸掛
止時を示す説明図、同図ｃは、次の縫製開始に伴
う下糸の引き出し状態を示す説明図、第３図ない
し第６図は、従来のミシンの糸切断装置を示す図
で、第３図は、ミシンの糸切断装置の構成状態を
示す平面図、第４図は、駆動メスと固定メスとに
よる縫い糸の切断状態を示す説明図で、同図ａは
、駆動メスが初期位置より縫い糸方向に移動する
状態を示す説明図、同図ｂは、駆動メスが上下糸
を掛止した状態を示す説明図、同図ｃは、駆動メ
スと固定メスとが協働して、上下糸を切断してい
る状態を示す説明図、第５図は、駆動メスおよび
下糸保持体を示す平面図、第６図は、下糸の保持
状態を示す説明図で、同図ａは、下糸切断時を示
す説明図、同図ｂは、下糸切断後の下糸保持状態
を示す説明図、同図ｃは、次の縫製開始に伴う下
糸の引き出し状態を示す説明図、第７図は、下糸
が適正に引き出されず縫製が進行し、下糸が縫い
目に入り込み布に突き張りが生じた状態を示す説
明図である。図において、４……固定メス、５……駆動メス
、Ａ……下糸保持体、９ｂ……下糸。 1 and 2 are diagrams showing an embodiment of a thread cutting device for a sewing machine according to this invention, and FIG.
FIG. 2 is a plan view of the thread cutting device of the sewing machine; FIG. These are explanatory diagrams showing the action. Figure a is an explanatory diagram showing when the bobbin thread is cut, Figure b is an explanatory diagram showing when the bobbin thread is hooked after cutting the bobbin thread, and Figure c is an explanatory diagram showing the time when the bobbin thread is hooked after cutting the bobbin thread. An explanatory diagram showing a state in which the bobbin thread is pulled out at the start, and FIGS. 3 to 6 are diagrams showing a thread cutting device of a conventional sewing machine, and FIG. 3 is a plan view showing a configuration state of the thread cutting device of a sewing machine. Figure 4 is an explanatory diagram showing a state in which the sewing thread is cut by the driving knife and the fixed knife. Figure a is an explanatory diagram showing a state in which the driving knife moves in the direction of the sewing thread from the initial position, and Figure b is an explanatory diagram showing the state in which the driving knife moves in the direction of the sewing thread from the initial position. , Fig. 5 is an explanatory diagram showing a state in which the driving knife has hooked the upper and lower threads, Figure c is an explanatory diagram showing a state in which the driving knife and the fixed knife are working together to cut the upper and lower threads, and Fig. , a plan view showing the driving knife and the bobbin thread holder, and FIG. 6 is an explanatory diagram showing the state in which the bobbin thread is held. FIG. An explanatory diagram showing the state in which the bobbin thread is held after cutting, Figure c is an explanatory diagram showing the state in which the bobbin thread is pulled out at the start of the next sewing, and Fig. 7 shows that the bobbin thread is not drawn out properly and sewing progresses. FIG. 3 is an explanatory diagram showing a state where the bobbin thread enters the seam and tension is generated in the cloth. In the figure, 4... fixed knife, 5... driving knife, A... lower thread holder, 9b... lower thread.

Claims

[Scope of claim for utility model registration] A fixed knife fixed at a position below the throat plate away from the sewing needle drive path, and a fixed knife located below the fixed knife so that it can be driven in the direction of the sewing thread, and which hooks the upper and lower threads. A driving knife that cuts the upper and lower threads in cooperation with the fixed knife, and a driving knife that is located below the driving knife and works together with the driving knife to temporarily hold the lower thread of the sewing thread when the driving knife cuts the upper and lower threads. A thread cutting device for a sewing machine, comprising: a bobbin thread holder that hangs the bobbin thread at a proper position in a released state after cutting;