JPS6315969U - - Google Patents

Description

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本考案の一実施例の平面図、第２図は
内かま３の軌帯７が外かま１の軌溝８に嵌合した
状態を示す拡大断面図、第３図は外かまの表面の
一部の拡大断面図である。 １……外かま、２……外かまの軸、３……内か
ま、４……内かま抑え、５……外かまの剣先、６
……内かま回止め突起、７……軌帯、８……軌溝
、９……硬化層、１０……硬質クロムメツキ層、
１１……窒化チタン層、１２……浸炭硬化層、１
３……硬化層。 Fig. 1 is a plan view of one embodiment of the present invention, Fig. 2 is an enlarged sectional view showing the state in which the raceway 7 of the inner hook 3 is fitted into the raceway groove 8 of the outer hook 1, and Fig. 3 is an enlarged sectional view of the outer hook 3. FIG. 2 is an enlarged cross-sectional view of a part of the surface of 1...Outer hook, 2...Shaft of outer hook, 3...Inner hook, 4...Inner hook holding down, 5...Tip of outer hook, 6
... Inner rotary rotary locking protrusion, 7 ... Raceway, 8 ... Raceway groove, 9 ... Hardened layer, 10 ... Hard chrome plating layer,
11...Titanium nitride layer, 12...Carburized hardened layer, 1
3...Hardened layer.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 外かままたは内かまの少なくとも一方のかまの
表面に硬質クロムメツキ層を形成し、その硬質ク
ロムメツキ層上に窒化チタン層を形成したことを
特徴とするミシンの全回転かま。 A full-rotation hook for a sewing machine, characterized in that a hard chrome plating layer is formed on the surface of at least one of the outer hook and the inner hook, and a titanium nitride layer is formed on the hard chrome plating layer.