JPH0298872U

JPH0298872U -

Info

Publication number: JPH0298872U
Application number: JP439189U
Authority: JP
Priority date: 1989-01-20
Filing date: 1989-01-20
Publication date: 1990-08-07

Description

[Brief explanation of drawings]

図面は本考案の実施例に係り、第１図は第１の
実施例の上糸調子調節機構の説明図、第２図は予
備張力付与装置と回転抵抗型上糸調子器との断面
図、第３図はミシンの外観図、第４図は糸調子車
の説明図、第５図は糸調子車の要部拡大図、第６
図は第５図中の−線による拡大断面図、第７
図は第２実施例の上糸調子調節機構の説明図、第
８図は第３実施例の上糸調子調節機構の説明図、
第９図は第３実施例の回転抵抗型上糸調子器の説
明図、第１０図は制御ブロツク図、第１１図は糸
調子設定手段の説明図、第１２図は布厚検出手段
の説明図、第１３図は駆動軸回転検出手段の説明
図であり、１１は上糸供給源の糸コマ、４は天秤
、１５は糸調子軸、１６と１８は糸調子皿、１９
は第１の調節体、７は糸調子バネ、１２は押圧型
上糸調子器、２３は回転支持軸、２６は糸調子車
、２７は第２の調節体、１３は回転抵抗型上糸調
子器、３２は連結手段であるベルト、３３は糸調
子設定手段の糸調子ダイアルである。 The drawings relate to an embodiment of the present invention, and FIG. 1 is an explanatory diagram of the upper thread tension adjustment mechanism of the first embodiment, FIG. 2 is a sectional view of a pre-tensioning device and a rotation resistance type upper thread tension device, Figure 3 is an external view of the sewing machine, Figure 4 is an explanatory diagram of the thread tension wheel, Figure 5 is an enlarged view of the main parts of the thread tension wheel, and Figure 6 is an enlarged view of the main parts of the thread tension wheel.
The figure is an enlarged sectional view taken along the - line in Figure 5.
The figure is an explanatory diagram of the upper thread tension adjustment mechanism of the second embodiment, FIG. 8 is an explanatory diagram of the upper thread tension adjustment mechanism of the third embodiment,
Fig. 9 is an explanatory diagram of the rotation resistance type upper thread tension device of the third embodiment, Fig. 10 is a control block diagram, Fig. 11 is an explanatory diagram of the thread tension setting means, and Fig. 12 is an explanation of the cloth thickness detection means. 13 are explanatory diagrams of the drive shaft rotation detection means, in which 11 is the thread piece of the upper thread supply source, 4 is the thread take-up lever, 15 is the thread tension shaft, 16 and 18 are the thread tension discs, 19
1 is a first adjusting body, 7 is a thread tension spring, 12 is a pressing type upper thread tension device, 23 is a rotating support shaft, 26 is a thread tension wheel, 27 is a second adjusting body, 13 is a rotation resistance type upper thread tension device 32 is a belt which is a connecting means, and 33 is a thread tension dial which is a thread tension setting means.

Claims

[Scope of utility model registration request]

One of a pair of thread tension discs which is fitted onto a thread tension shaft fixed to the sewing machine frame and which is disposed on the needle thread path between the needle thread supply source and the thread take-up and which holds the needle thread therebetween, and the thread tension disc. A press-type upper thread tension device that adjusts the pressing force of a thread tension spring disposed between the first adjusting body and the first adjusting body rotatably fitted on a shaft; A rotating member that engages in frictional contact with the inner diameter portion and the upper thread, which is rotatably fitted to a rotary support shaft which is disposed on the upper thread path between the upper thread tension device and the thread take-up and is fixed to the sewing machine frame. The rotational resistance type upper thread tensioner adjusts the pressure of a rotational resistance spring that applies rotational resistance to the side surface of the thread tension wheel consisting of the upper and lower parts by the rotation of a second adjustment body that is rotatably fitted to the rotational support shaft. The vessel and
A connecting means for connecting the first adjusting body and the second adjusting body, and a thread tension setting means for connecting to either the first adjusting body or the second adjusting body. Upper thread tension adjustment mechanism of sewing machine.