JPH037376U

JPH037376U -

Info

Publication number: JPH037376U
Application number: JP6769789U
Authority: JP
Priority date: 1989-06-09
Filing date: 1989-06-09
Publication date: 1991-01-24

Description

[Brief explanation of the drawing]

図は本考案の一実施例を示すもので、第１図は
糸切断装置を含むミシンの要部の平面図、第２図
は第１図の−線断面図、第３図は動メスの拡
大平面図、第４図は第３図の−線断面図、第
５図は第３図の−線断面図、第６図及び第７
図は異なるタイミングにおける糸切断機構及びピ
ツカーの動きを上糸及び下糸に関連して示した要
部の斜視図、第８図は糸切断装置のタイミングチ
ヤート、第９図は動メスによる糸分け状態を示す
平面図、第１０図は天秤による上糸引上げ後の動
メスと各糸との関係を示す平面図、第１１図は下
糸案内レバーにより上糸を動メスの回動軌跡内に
動かした状態を示す平面図、第１２図は動メスの
切断刃と固定刃との協働による布側上糸の切断状
態を示す断面図である。１０……糸切断機構、１３……針板、３０……
釜、３４……針穴、４４……動メス、４６……第
１係止溝、５２……切断刃、６６……下糸案内機
構、７４……下糸案内レバー、Ｔ１……上糸、Ｔ
２……下糸、Ｔ１ａ……針側上糸、Ｔ１ｂ……布
側上糸。 The figures show one embodiment of the present invention. Figure 1 is a plan view of the main parts of the sewing machine including the thread cutting device, Figure 2 is a cross-sectional view taken along the line - - of Figure 1, and Figure 3 is a section of the moving knife. An enlarged plan view, FIG. 4 is a sectional view taken along the - line in FIG. 3, FIG. 5 is a sectional view taken along the - line in FIG. 3, and FIGS.
The figure is a perspective view of the main parts showing the movement of the thread cutting mechanism and picker at different timings in relation to the upper and lower threads, Fig. 8 is a timing chart of the thread cutting device, and Fig. 9 is thread separation using a moving knife. Fig. 10 is a plan view showing the relationship between the moving knife and each thread after the upper thread has been pulled up by the thread take-up, and Fig. 11 is a plan view showing the relationship between the moving knife and each thread after the upper thread has been pulled up by the thread take-up. FIG. 12 is a plan view showing a moving state, and a cross-sectional view showing a state in which the cloth-side needle thread is cut by cooperation between the cutting blade of the moving knife and the fixed blade. 10... Thread cutting mechanism, 13... Throat plate, 30...
Hook, 34... Needle hole, 44... Moving knife, 46... First locking groove, 52... Cutting blade, 66... Lower thread guide mechanism, 74... Lower thread guide lever, T1... Upper thread , T
2...Lower thread, T1a...Needle side upper thread, T1b...Fabric side upper thread.

Claims

[Scope of utility model registration request]

In a sewing machine that performs sewing using a bobbin thread sent out from a hook provided below a needle hole in the throat plate, and an upper thread fed out from a needle that moves up and down toward the hook through the needle hole, Below, move from the standby position to the swinging position, and from this swinging position to the cutting position move the area where only the fabric-side upper thread and needle-side upper thread, excluding the bobbin thread, exist between the needle hole and the shuttle. A movable knife is provided, and the movable knife has a needle-side upper thread locking portion on the front side and a cutting blade on the rear side with respect to the direction of movement toward the swinging position, and the movable knife has a needle-side needle thread locking portion on the front side and a cutting blade on the rear side in the direction of movement toward the swinging position. When moving to the position, the cloth-side needle thread existing between the needle hole and the hook is separated to the cutting blade side, and the needle-side needle thread is separated to the needle-side needle thread locking part side, and the swinging The needle thread on the cloth side is cut when moving from the position to the standby position, and further, the lower thread between the needle hole and the hook is cut at least by the swinging knife of the movable knife. When moving from the movable position to the cutting position, the movable knife is movable between a bobbin thread cutting position within a movement range of the cutting blade of the movable scalpel in the relevant direction, and a bobbin thread non-cutting position separated from the bobbin thread. A thread cutting device for a sewing machine, characterized by being provided with a bobbin thread guide mechanism.