JPH0327473U

JPH0327473U -

Info

Publication number: JPH0327473U
Application number: JP8720089U
Authority: JP
Priority date: 1989-07-25
Filing date: 1989-07-25
Publication date: 1991-03-19

Description

[Brief explanation of drawings]

第１図〜第９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図に示した糸切断装置の要部
の拡大図、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図は固定刃の拡
大図、第６図は第５図の左側面図、第７図は第５
図の−線断面拡大図、第８図は及び第９図は
糸切断装置により所定の糸を切断する際の固定刃
に対する動メスの動きと糸との関係をそれぞれ異
なる位置で示した断面図、第１０図は従来の糸切
断装置の第８図に対応する断面図である。１０……糸切断装置、１４……針板、２０……
針穴、２４……固定刃、２５ａ……切断縁、２４
ａ……糸切れ防止片、２８……動メス、４０……
切断刃、４２……第２係止溝。 Figures 1 to 9 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, and Figure 2 is a plan view of the thread cutting device shown in Figure 1. An enlarged view of the main parts, Fig. 3 is an enlarged plan view of the movable scalpel, Fig. 4 is a sectional view taken along the - line in Fig. 3, Fig. 5 is an enlarged view of the fixed blade, and Fig. 6 is the left side of Fig. 5. Figure 7 is the 5th
8 and 9 are cross-sectional views showing the relationship between the motion of the movable knife relative to the fixed blade and the thread at different positions when cutting a predetermined thread with the thread cutting device. , FIG. 10 is a sectional view corresponding to FIG. 8 of a conventional thread cutting device. 10... Thread cutting device, 14... Throat plate, 20...
Needle hole, 24... Fixed blade, 25a... Cutting edge, 24
a... Thread breakage prevention piece, 28... Moving knife, 40...
Cutting blade, 42...second locking groove.

Claims

[Scope of utility model registration request]

A throat plate attached to the upper surface of the main body of the sewing machine, a fixed blade fixed to the main body below the throat plate, and a needle hole provided in the throat plate from a remote position apart from the fixed blade. A movable knife is provided which is movable to a cutting position that intersects with the fixed blade below the fixed blade in order to cut a predetermined thread passing therethrough, and the movable knife has an end on the front side with respect to the direction of movement to the cutting position. To,
A locking part for locking the predetermined thread, which is formed so as to be kept in a non-contact state with respect to the fixed blade when moving to the cutting position, and a locking part for locking the predetermined thread, and a locking part for locking the predetermined thread, which is formed so as to be kept in a non-contact state with respect to the fixed blade when moving to the cutting position. A cutting blade is provided at an appropriate distance in a direction opposite to the direction in which the movable scalpel moves to the cutting position, and the fixed blade has the cutting blade at an end on the rear side with respect to the direction in which the movable scalpel moves to the cutting position. A thread cutting device for a sewing machine having a cutting edge for cutting thread in cooperation with a sewing machine, wherein the fixed blade is disposed between the moving knife and the throat plate by moving the moving knife to the cutting position. Adjustment is made so that the angular change at the contact portion with the cut edge of the thread stretched between the locking portion and the needle hole of the throat plate through the end portion having the cut edge of the needle plate is slight. A thread cutting device for a sewing machine, characterized in that a thread breakage prevention mechanism is provided to prevent thread breakage before the cutting blade cooperates with the cutting edge.