JPH0639658Y2 - Full rotation sewing machine hook - Google Patents

Description

【考案の詳細な説明】 〔産業上の利用分野〕 この考案は全回転ミシンにおける釜に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a hook in a full-rotary sewing machine.

〔本考案が解決しようとする問題点〕[Problems to be solved by the present invention]

近年、ミシンは高速化とともに縫製材の多様化が要求さ
れている。In recent years, sewing machines have been required to have higher speeds and diversified sewing materials.

ミシンを高速運転するとそれに使用する釜は、内釜の軌
帯と外釜の軌帯溝とが摩擦し、高熱を発し両者の摩耗が
著しく又、焼付けを起こし運転不能となる。When the sewing machine is operated at high speed, the cauldron used for the sewing machine becomes inoperative due to friction between the gauge belt of the inner hook and the groove groove of the outer hook, resulting in high heat, significant wear of both, and seizure.

又、使用する糸には伸縮率が大で滑りの悪いものがあ
り、この様な糸を使用した場合には糸切れの原因とな
る。In addition, some of the yarns used have a large expansion and contraction rate and have poor slippage, and when such a yarn is used, it causes yarn breakage.

これらの問題を解決するために、従来、焼付け防止のた
めには潤滑油の供給や、実公昭46−27071に開示されて
いるように低摩擦係数の四フッ化エチレン、三フッ化塩
化エチレンおよびこれらの重合体の皮膜を必要箇所に形
成する方式や実開昭63−147190に開示されるように窒化
チタンの皮膜を表面に形成する方式等の考案が提示され
ている。In order to solve these problems, in the past, in order to prevent seizure, a lubricating oil was supplied, and as disclosed in JP-B-46-27071, tetrafluoroethylene, trifluoroethylene chloride having a low friction coefficient and There have been proposed methods such as a method of forming a film of these polymers on a required portion and a method of forming a film of titanium nitride on the surface as disclosed in Japanese Utility Model Application Laid-Open No. 63-147190.

しかし、潤滑油の供給は給油機構の複雑化、潤滑油飛散
による布地の汚染、環境の汚染が問題になり、又、前記
低摩擦係数の皮膜は地金との結合力が弱く、又、摩耗に
弱いため短期間に剥離して長期の効果を期待できない。
更に、前記皮膜を形成するには、200度Ｃ〜300度Ｃの高
温処理を施すため、表面硬化処理を施した釜が硬度低下
をきたし短寿命になることが指摘されている。However, the supply of lubricating oil poses a problem of complicated lubrication mechanism, contamination of fabric due to scattering of lubricating oil, and environmental pollution, and the coating with a low coefficient of friction has a weak bonding force with the metal and wear. Since it is weak against peeling, it cannot be expected to have long-term effects because it peels off in a short time.
Further, it has been pointed out that in order to form the above-mentioned film, a high temperature treatment of 200 ° C. to 300 ° C. is performed, so that the pot subjected to the surface hardening treatment has a reduced hardness and a short life.

又、窒化チタンの皮膜は実際面では円滑な糸滑りを阻害
する性質があり、均一、美麗な縫目を得ることが出来な
い。Further, the titanium nitride film actually has a property of hindering smooth thread sliding, and it is not possible to obtain uniform and beautiful seams.

〔問題点を解決するための手段〕[Means for solving problems]

本考案はこれらの欠点を皆無とするために発案されたも
のである。The present invention was devised to eliminate these drawbacks.

即ち、前記低摩擦皮膜の釜地金との結合力を強化すると
ともに、低摩擦皮膜形成時の高温にも十分に耐え得るよ
うにするため、先ず地金に窒化チタン、セラミックス等
の耐熱性、耐摩耗性の多孔質または梨地状の皮膜を被覆
し、その上に更に前記低摩擦皮膜を形成する。このよう
に二重に皮膜を形成した場合には、結果的に、初期摩耗
以後、低摩耗性皮膜に耐摩耗性の高い窒化チタン、セラ
ミックス等を介在させるような状態となり、低摩擦性且
つ耐摩耗性の表面を形成させることになる。That is, in order to strengthen the binding force of the low-friction coating with the metal kettle and to withstand the high temperatures during the formation of the low-friction coating, first, the base metal is heat-resistant, such as titanium nitride and ceramics, A wear-resistant porous or satin-like film is coated, and the low friction film is further formed thereon. When the double coating is formed as described above, as a result, after the initial wear, titanium nitride, ceramics, etc. having high wear resistance are intervened in the low wear coating, resulting in low friction and resistance. It will form an abradable surface.

〔実施例〕〔Example〕

以下、本考案の一実施例を図面に基づいて説明する。 An embodiment of the present invention will be described below with reference to the drawings.

第１図は釜の分解図であり、１は外釜、２は内釜、３は
切欠ガイドリングであり、内釜２の軌帯４が外釜１の軌
帯溝５に回転自在に嵌合し切欠ガイドリング３を外釜１
の外周に螺着することによって外釜１と内釜２が回転の
み可能に結合していることになる。このような釜は公知
のごとく図示されていない駆動軸が外釜１に嵌着螺止さ
れていて、又、内釜２の開口部に設けられた係止溝６に
図示されていないミシン本体に装着された釜止片が嵌着
されている。このため駆動軸が回転すると内釜２が停止
のまま外釜１のみが回転することになり、軌帯４と軌帯
溝５の間は金属間接触摺動となり特に高速回転の場合に
は高熱を発し摩耗が著しく発生することになる。この欠
点を解決するため本考案では、第２図のごとく釜の地金
７の表面に地金の鉄より硬い窒化チタン、セラミックス
等を梨地状または多孔質項に硬化皮膜８を形成し更にそ
の表面に低摩耗係数の四フッ化エチレン、三フッ化塩化
エチレンおよびこれらの重合体のフッ素樹脂皮膜９を形
成する。FIG. 1 is an exploded view of the hook, 1 is an outer hook, 2 is an inner hook, 3 is a notch guide ring, and the rail 4 of the inner hook 2 is rotatably fitted in the rail groove 5 of the outer hook 1. Attach the notch guide ring 3 to the outer hook 1
The outer pot 1 and the inner pot 2 are rotatably connected to each other by being screwed onto the outer periphery of the. In such a hook, as is well known, a drive shaft (not shown) is fitted and screwed to the outer hook 1, and a sewing machine main body (not shown) is provided in a locking groove 6 provided in the opening of the inner hook 2. The hook stopper attached to is attached. For this reason, when the drive shaft rotates, only the outer hook 1 rotates while the inner hook 2 remains stopped, and metal-metal contact sliding occurs between the track 4 and track groove 5, especially when high speed rotation occurs. Will be generated and wear will occur remarkably. In order to solve this drawback, according to the present invention, as shown in FIG. 2, a hard coating 8 is formed on the surface of the metal 7 of the kettle on the surface of the metal 7 such as titanium nitride, ceramics, etc. A fluororesin film 9 made of tetrafluoroethylene, trifluoroethylene chloride or a polymer thereof having a low wear coefficient is formed on the surface.

この様に二層の皮膜の場合には初期摩耗においては第二
層のフッ素樹脂層が摩耗し、第３図、第４図に示すごと
く第一層の突出部10がフッ素樹脂層より露出するように
なり、あたかもフッ素樹脂の表面に鉄より硬い窒化チタ
ン、セラミックス等の斑点が無数に点在する状態とな
る。表面がこの様な状態となると釜はこれ以後は摩耗に
強く、且つ、低摩擦係数の表面で覆われることになる。As described above, in the case of a two-layer coating, the fluororesin layer of the second layer is abraded in the initial abrasion, and the protrusion 10 of the first layer is exposed from the fluororesin layer as shown in FIGS. 3 and 4. As a result, countless spots of titanium nitride, ceramics, etc., which are harder than iron, are scattered on the surface of the fluororesin. When the surface is in such a state, the shuttle is thereafter resistant to wear and covered with a surface having a low friction coefficient.

尚、従来のフッ素樹脂単層コーテングの場合はこれが剥
離した場合、コーテング時の加熱処理により釜地金の浸
炭焼入等による表面硬化層が軟化しているため短寿命で
あったが、本考案によるものはセラミックス、窒化チタ
ン等の耐熱性の皮膜が第一層にあるため第二層のフッ素
樹脂層が剥離しても高硬度の層があるため長寿命とな
る。In the case of the conventional fluororesin single-layer coating, if it peeled off, the surface hardening layer was softened due to the carburizing and quenching of the pot metal due to the heat treatment during coating, but the life was short. Since the heat-resistant coating of ceramics, titanium nitride or the like is present in the first layer, it has a long-life because there is a layer of high hardness even if the second fluororesin layer is peeled off.

〔考案の効果〕[Effect of device]

本考案により次の効果が実際に確認できた。 The following effects were actually confirmed by the present invention.

潤滑油供給装置が不要となり釜の構造が簡略化されコ
ストダウンが可能となった。A lubricating oil supply device is no longer required, and the structure of the hook is simplified, enabling cost reduction.

潤滑油が不要となったため布地の汚れ、環境汚染がな
くなった。Since lubricating oil is no longer needed, there is no stain on the fabric or environmental pollution.

低摩擦のため糸の滑りが良くなり、糸切れ、目飛び等
がなくなり、更に、如何なる糸でも均一美麗な縫目が形
成できた。Because of the low friction, the thread slipped well, thread breakage, skipping, etc. were eliminated, and a uniform and beautiful seam was formed with any thread.

耐摩耗性が向上したため長寿命となった。Longer life due to improved wear resistance.

【図面の簡単な説明】[Brief description of drawings]

第１図は釜の分解図、第２図及び第３図は本考案による
各々釜表面の拡大断面図、初期摩耗以後の釜の拡大断面
図、第４図は第３図の平面図。 1:外釜、2:内釜、3:切欠ガイドリング 4:軌帯、5:軌帯溝、7:釜の地金 8:硬化皮膜、9:フッ素樹脂皮膜1 is an exploded view of a hook, FIGS. 2 and 3 are enlarged cross-sectional views of the surface of the hook according to the present invention, an enlarged cross-sectional view of the hook after initial wear, and FIG. 4 is a plan view of FIG. 1: Outer pot, 2: Inner pot, 3: Notch guide ring 4: Gage, 5: Gage groove, 7: Metal of pot, 8: Hardened film, 9: Fluororesin film

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 【請求項１】全回転ミシンの釜において、それの構成要
素である外釜、内釜、切欠ガイドリングの少なくとも一
つの構成要素の表面に第一層として窒化チタン、セラミ
ックス等耐熱性、耐摩耗性を有する硬化層を細かく凹凸
を有する梨地状又は多孔質の状態に形成し、更に、その
表面に第二層としてフッ素樹脂等の低摩擦係数の皮膜を
形成したことを特徴とする全回転ミシンの釜。1. A rotary hook of a full-rotary sewing machine, in which at least one of the constituent elements of the rotary hook, the inner hook, and the notch guide ring is made of titanium nitride as a first layer, heat resistance and wear resistance such as ceramics. Fully rotating sewing machine characterized by forming a hardened layer having fine properties into a finely textured or satin-like state or a porous state, and further forming a film of low friction coefficient such as fluororesin as a second layer on the surface thereof. Kettle.