JP5198921B2 - Sewing needle - Google Patents
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- JP5198921B2 JP5198921B2 JP2008097014A JP2008097014A JP5198921B2 JP 5198921 B2 JP5198921 B2 JP 5198921B2 JP 2008097014 A JP2008097014 A JP 2008097014A JP 2008097014 A JP2008097014 A JP 2008097014A JP 5198921 B2 JP5198921 B2 JP 5198921B2
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- 238000009958 sewing Methods 0.000 title claims description 43
- 235000019589 hardness Nutrition 0.000 description 83
- 230000000694 effects Effects 0.000 description 4
- 230000001965 increasing effect Effects 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
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Description
本発明は、針としての高弾性を確保しながら、針先の耐変形性と耐摩耗性に優れたミシン針に関するものである。 The present invention relates to a sewing needle that is excellent in deformation resistance and wear resistance of a needle tip while ensuring high elasticity as a needle.
ミシン針の針先は、生地、ミシンの釜あるいは釜剣先などとの直接接触や衝突によって損傷や摩耗を受け易い。このため、針先の耐変形性、耐摩耗性がミシン針の寿命を決定している。針先の耐変形性、耐摩耗性が低いと縫製中に、特に自動車シート、ジーンズ、皮革などの硬い生地の縫製中に、ミシン針の早期交換が必要となり、縫製作業における生産性の低下やコスト高の要因となっている。 The needle tip of the sewing needle is susceptible to damage and wear due to direct contact or collision with the fabric, sewing machine hook or hook sword tip. For this reason, the deformation resistance and wear resistance of the needle tip determine the life of the sewing needle. If the needle tip has low deformation resistance and wear resistance, it is necessary to replace the sewing needle early during sewing, especially during the sewing of hard fabrics such as automobile seats, jeans, leather, etc. This is a factor of high costs.
上記の対策として、例えば特許文献1には、TiN(窒化チタン)、DCL(ダイヤモンドライクカーボン)などで表面コーティング処理を行ない、針表面を硬化させる方法が提案されている。しかし、この方法では、針先部のコーティング層が剥離し易く、また、生産性が不十分であり、コスト高となることを回避できない。 For example, Patent Document 1 proposes a method of curing the needle surface by performing a surface coating process using TiN (titanium nitride), DCL (diamond-like carbon), or the like. However, according to this method, the coating layer at the needle tip part is easily peeled off, and the productivity is insufficient, and it cannot be avoided that the cost increases.
一方、針先の耐変形性、耐摩耗性を向上させるために、従来より針先全体の硬度を上げる方法も知られている。ミシン針の場合、高弾性は針の品質要求の本質的なものであるが、従来のように針全体の硬度を800(HV)以上(HV:ビッカース硬度)にすると弾性がなくなって脆くなってしまい、ミシンへの装着時あるいは縫製中に針折れの危険性が高まってしまうおそれがある。また、針穴部やえぐり部付近で針が粉々に破損して飛散することにより、縫製作業者などに身体的被害を及ぶすおそれもあることが判明している。 On the other hand, in order to improve the deformation resistance and wear resistance of the needle tip, a method of increasing the hardness of the entire needle tip has been known. In the case of sewing needles, high elasticity is an essential requirement of needle quality, but if the overall hardness of the needle is 800 (HV) or higher (HV: Vickers hardness) as in the past, the elasticity disappears and becomes brittle. Therefore, there is a risk that the risk of needle breakage may increase during mounting on the sewing machine or during sewing. Further, it has been found that there is a possibility of causing physical damage to a sewing manufacturer or the like due to the needles being broken and scattered in the vicinity of the needle hole part or the counterbore part.
また、特許文献2には、針全体を複数の部分に分け、各部分を異なった硬度(例えば針先が最も硬い)とした針が開示されている。しかしながら、この針の場合、各部分の硬度のみに着目しただけであり、ミシン針全体から見たときの高弾性、特に針先飛散の安全性については十分には考慮されていない。また、異なった硬度を有する部分の位置限界と硬度限界も明確にされていない。
上記したように、従来においては、針として必要な高弾性を保持したまま、針先の十分な耐変形性、耐摩耗性を備えたミシン針は見当たらなかった。本発明は、このような要求を満たすためになされたもので、針としての高弾性を保持したまま、針先の十分な耐変形性と耐摩耗性を備えたミシン針を提供することを目的とするものである。 As described above, conventionally, there has not been found a sewing needle having sufficient deformation resistance and wear resistance of the needle tip while maintaining high elasticity necessary for the needle. The present invention has been made to satisfy such a demand, and an object of the present invention is to provide a sewing needle having sufficient deformation resistance and wear resistance of a needle tip while maintaining high elasticity as a needle. It is what.
一般的に、ミシン針における耐変形性、耐摩耗性は、次の2つの観点のバランスによって決まる。1つは、ミシン針の硬さ水準であり、他の1つは、ミシン針の靱性である。しかしながら、これら2つの観点を満足するために必要とされる特性は、互いに相反するものである。すなわち、針を硬くするほど針先の耐変形性、耐摩耗性は向上するが、反対に靱性は低下し、針折れなどが発生し易くなる。逆に、靱性を高くするほど針折れなどが発生しにくくなり、安全性は向上するが、反対に針先の耐変形性、耐摩耗性は低下してしまう。 Generally, the deformation resistance and wear resistance of a sewing needle are determined by the balance of the following two viewpoints. One is the hardness level of the sewing needle and the other is the toughness of the sewing needle. However, the characteristics required to satisfy these two viewpoints are contradictory to each other. That is, as the needle becomes harder, the deformation resistance and wear resistance of the needle tip are improved, but on the contrary, the toughness is lowered and needle breakage or the like is likely to occur. Conversely, as the toughness is increased, needle breakage and the like are less likely to occur and the safety is improved, but conversely, the deformation resistance and wear resistance of the needle tip are reduced.
本発明者らは、上記2つの観点に基づいてミシン針が必要とする高弾性の保持と、針先の耐変形性、耐摩耗性の向上を両立させるべく、鋭意実験と研究を重ねた。その結果、針先部、針本体部の硬さ、特に硬化する領域を特定の範囲に設定すると同時にその硬さを特定の値に設定すれば、針としての高弾性を保持させながら、針先の耐変形性、耐摩耗性に優れたミシン針を得ることができることを見出したものである。 Based on the above two viewpoints, the present inventors have conducted intensive experiments and researches in order to achieve both the high elasticity required by the sewing needle and the improvement of the deformation resistance and wear resistance of the needle tip. As a result, if the hardness of the needle tip portion and the needle body portion, particularly the hardened area is set to a specific range and the hardness is set to a specific value, the needle tip is maintained while maintaining high elasticity as a needle. It has been found that a sewing needle excellent in deformation resistance and wear resistance can be obtained.
本発明は、上記知見に基づいてなされたもので、ミシン針において、針穴よりも下側であって、かつ、針先端から1.5〜5.0mmの範囲の針先部分を硬度800〜950(HV)の高硬度領域とするとともに、該高硬度領域に続くその上側の0.1〜0.5mmの範囲を硬度500〜650(HV)の低硬度領域とし、さらに該低硬度領域に続くその上側の針本体部分の硬度を690〜770(HV)の中硬度領域とし、針先側の高硬度領域と針本体部側の中硬度領域の間を幅の狭い低硬度領域でつないだことを特徴とするものである。 The present invention has been made on the basis of the above findings. In the sewing needle, the needle tip portion below the needle hole and in the range of 1.5 to 5.0 mm from the needle tip has a hardness of 800 to 800 mm. A high hardness region of 950 (HV) and a range of 0.1 to 0.5 mm above the high hardness region is defined as a low hardness region of hardness 500 to 650 (HV), and further to the low hardness region Next, the hardness of the needle body on the upper side is set to a medium hardness region of 690 to 770 (HV), and a high hardness region on the needle tip side and a medium hardness region on the needle body side are connected with a narrow low hardness region. It is characterized by this.
本発明によれば、針の硬度を針先端から針柄部の側に向かって高硬度領域、低硬度領域、中硬度領域の三段構成とし、これら各領域の長さとその硬度を最良の値に設定したので、針としての必要な高弾性を保持させたまま、針先の耐変形性、耐摩耗性を向上させることができる。また、針が簡単に折れるようなことがなくなるので、縫製時の安全性も十分に確保することができる。さらに、針先の耐久性の向上に伴い、針の交換時期を長くすることができ、縫製現場の生産性向上とコスト削減に資することができる。 According to the present invention, the hardness of the needle has a three-stage configuration of a high hardness region, a low hardness region, and a medium hardness region from the needle tip toward the needle handle side, and the length and the hardness of each region are the best values. Therefore, the deformation resistance and wear resistance of the needle tip can be improved while maintaining the necessary high elasticity as a needle. In addition, since the needle is not easily broken, safety at the time of sewing can be sufficiently ensured. Furthermore, with the improvement of the durability of the needle tip, the needle replacement time can be lengthened, which can contribute to the improvement in productivity and cost reduction at the sewing site.
以下、図面を参照して本発明の実施の形態について説明する。
図1は本発明の説明図であって、1は針本体部、2は針穴、3は針先部、4は針先端である。本発明のミシン針は、針穴2よりも下側であって、針先端4から1.5〜5.0mmの範囲の針先部分を硬度800〜950(HV)の高硬度領域L1とし、該高硬度領域L1に続くその上側の0.1〜0.5mmの範囲を硬度500〜650(HV)の低硬度領域L2とし、さらに、該低硬度領域L2に続くその上側の針本体部1の部分の硬度を690〜770(HV)の中硬度領域L3とし、針先側の高硬度領域L1と針本体部側の中硬度領域L3の間を幅の狭い低硬度領域L2によってつなぐことにより、針先端から針柄部側に向かって、針の硬度を高硬度領域L1、低硬度領域L2、中硬度領域L3の三段構成としたものである。
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is an explanatory diagram of the present invention, in which 1 is a needle body, 2 is a needle hole, 3 is a needle tip, and 4 is a needle tip. The sewing needle of the present invention is located below the
一般に、針先の耐変形性と耐摩耗性を確保するには、針先の硬度を高めることが有効である。しかしながら、針先の硬度を高くし過ぎると、針と接触するミシン部品に損傷を与えるおそれがある。また、硬度を高くすると針が脆くなり易く、針先部3が折れて飛散し、縫製作業および縫製品の安全問題を誘発する危険を増加させる。一方、針先部3の硬度を低くし過ぎると、針先部3が柔らかくなり過ぎるため、十分な耐変形性、耐摩耗性を確保することができない。
In general, it is effective to increase the hardness of the needle tip in order to ensure the deformation resistance and wear resistance of the needle tip. However, if the hardness of the needle tip is too high, there is a risk of damaging the sewing machine component that contacts the needle. Further, when the hardness is increased, the needle is likely to become brittle, and the
本発明者らは、これらの点に鑑み鋭意実験と研究を重ねた結果、針先側の硬さを硬度800〜950(HV)の範囲に設定すれば、針先の安全性を十分に確保しながら、針先部分の耐変形性と耐摩耗性を十分に確保できることを見出したものである。800(HV)よりも小さいと、柔らか過ぎて耐変形性、耐摩耗性が十分でなく、950(HV)を超えると、硬すぎて針先が脆くなり、針折れを生じるおそれがある。 As a result of intensive experiments and researches in view of these points, the present inventors have sufficiently secured the safety of the needle tip if the hardness on the needle tip side is set in the range of hardness 800 to 950 (HV). However, it has been found that the deformation resistance and wear resistance of the needle tip portion can be sufficiently secured. If it is less than 800 (HV), it is too soft and the deformation resistance and wear resistance are not sufficient, and if it exceeds 950 (HV), the needle tip is too hard and the needle tip may become brittle, which may cause needle breakage.
また、上記高硬度800〜950(HV)とする範囲L1は、種々の実験結果から、針穴2の下側であって、かつ、針先端4から1.5〜5.0mmの範囲とすることが望ましいことが判明した。すなわち、高硬度領域L1の範囲が1.5mmよりも小さくなると、硬化部分が少な過ぎるため、十分な耐久性が得られない。一方、高硬度領域L1が針穴2の位置まで達すると、縫製条件(ハンドリング、糸の張力、生地の厚さ、縫製素材など)やその他の様々な要因によって過大な荷重が発生して針に大きな単純曲げ応力、局部的曲げ応力、座屈力などが作用すると、高硬度に硬化した針穴2の部分が偏心荷重による曲げモーメントに耐えることができなくなる。その結果、縫製作業中に針穴2の部分で針が破損すると同時に上糸の離脱を招き、破片が飛散するおそれが高まってしまう。従って、高硬度とする領域L1は少なくとも針穴2よりも下側であることが必要である。
Further, the range L 1 for setting the high hardness 800 to 950 (HV) is, based on various experimental results, below the
本発明者らの実験結果によれば、高硬度とする領域L1の範囲は、針穴2よりも下側であって、針先端4から1.5〜5.0mmの範囲とすれば、すべての要求を満たすことが判明した。1.5mmより小さいと、前述したように針先が部分的に硬化されるため、十分な耐久性が得られない。5.0mmを超えると、針先部3の硬度バラツキが大きくなる。また、耐変形性、耐摩耗性の点からは、さらなる効果は得られない。
According to the present inventors' experimental results, the range of the region L 1 to a high hardness, a lower than the
また、針本体部1側の領域L3の部分の硬度を中程度の硬さである690〜770(HV)としているので、針本体部1に十分な弾性と靱性を与えることができ、針折れなどの発生を可能な限り防止することができる。なお、領域L3の硬度が690(HV)よりも小さいと柔らかくなり過ぎて弾性が不足し、770(HV)を超えると硬くなり過ぎて折れ易くなる。 Further, since the hardness of the region L 3 on the side of the needle body 1 is set to a moderate hardness of 690-770 (HV), the needle body 1 can be given sufficient elasticity and toughness, and the needle Occurrence of breakage and the like can be prevented as much as possible. Incidentally, too soft and the hardness of the region L 3 is less than 690 (HV) insufficient elasticity, easily broken too hard exceeds 770 (HV).
さらに、針先部3側の高硬度領域L1と針本体部1側の中硬度領域L3との間を、幅0.1〜0.5mm、硬度500〜650(HV)からなる低硬度領域L2でつないでいるので、針軸方向に過大な圧縮荷重や衝撃力が作用しても、間に挟んだ低硬度領域L2がクッション作用を発揮してこれらを吸収することができる。このため、過大な圧縮荷重や衝撃力によって針先が欠損するようなことを防止できる。なお、低硬度領域L2の硬さが500(HV)よりも小さいと、縫製作業中に低硬度領域L2部分で針折れが生じ易くなり、650(HV)よりも大きいと、過大な圧縮荷重、衝撃力を吸収するクッション的効果を発揮できなくなる。また、低硬度領域L2の幅が0.1mmよりも小さいと、十分なクッション作用を発揮することが困難となり、0.5mmを超えると、低硬度領域L2部分で針が破損し易くなる。
Further, between the high hardness region L 1 and hardness region L 3 into the needle main body 1 side of the
上記各領域L1,L2,L3と各硬度を備えたミシン針を得るには、超高周波焼入れ装置(例えば、高周波周波数27.12MHz)を用い、各領域L1,L2,L3のそれぞれについてその加熱温度と加熱時間を制御しながら焼入れを行なえばよい。 In order to obtain a sewing needle having each of the above regions L 1 , L 2 , L 3 and each hardness, an ultra high frequency quenching apparatus (for example, a high frequency frequency of 27.12 MHz) is used, and each region L 1 , L 2 , L 3 is used. For each of these, quenching may be performed while controlling the heating temperature and heating time.
本発明のミシン針(以下、「本発明品」という)と従来のミシン針(以下、「従来品」という)の物理特性の比較試験を行なったので以下に示す。 A comparative test of the physical characteristics of the sewing needle of the present invention (hereinafter referred to as “the product of the present invention”) and the conventional sewing needle (hereinafter referred to as “the conventional product”) was performed, and is shown below.
(1)弾性(折れ点)の比較試験
本発明品と従来品の弾性、すなわち針の折れ点を測定した。針の折れ点とは、針先端に横方向から力を加えていき、針が折れた時の垂直軸からの傾斜角度である。検査規格(JIS)において正常とみなされる折れ点は10°〜30°である。なお、弾性の比較試験に用いたミシン針は以下の仕様になるものである。
本発明品1:DP×17 #21
L1=2.9mm、硬度=875(HV)
L2=0.3mm、硬度=538(HV)
L3部分の硬度=736(HV)
従来品1:DP×17 #21、針全体の硬度=約820(HV)
従来品2:DP×17 #21、針全体の硬度=約740(HV)
(1) Elasticity (folding point) comparison test The elasticity of the product of the present invention and the conventional product, that is, the breaking point of the needle was measured. The needle break point is an inclination angle from the vertical axis when a force is applied to the tip of the needle from the lateral direction and the needle is broken. The break point regarded as normal in the inspection standard (JIS) is 10 ° to 30 °. The sewing needle used in the elasticity comparison test has the following specifications.
Invention product 1: DP × 17 # 21
L 1 = 2.9 mm, hardness = 875 (HV)
L 2 = 0.3 mm, hardness = 538 (HV)
L 3 portions of hardness = 736 (HV)
Conventional product 1: DP × 17 # 21, hardness of the entire needle = about 820 (HV)
Conventional product 2: DP × 17 # 21, hardness of the entire needle = about 740 (HV)
表1の試験結果から明らかなように、本発明品1は弾性の大きな従来品2と同等の弾性を有し、従来品と同様に折れにくいことが確認された。
As is clear from the test results in Table 1, it was confirmed that the product 1 of the present invention has the same elasticity as the
(2)針先の圧縮変形量の比較試験
本発明品と従来品の針先圧縮変形量を測定した。なお、圧縮変形量の比較試験に用いたミシン針は以下の仕様になるものである。
本発明品2:DP×17 #21
L1=3.4mm、硬度=880(HV)
L2=0.25mm、硬度=530(HV)
L3部分の硬度=730(HV)
従来品3:DP×17 #21、針全体の硬度=約740(HV)
(2) Comparison test of the amount of compressive deformation of the needle tip The amount of needle tip compressive deformation of the product of the present invention and the conventional product was measured. The sewing needle used for the comparison test of the amount of compressive deformation has the following specifications.
Invention product 2: DP × 17 # 21
L 1 = 3.4 mm, hardness = 880 (HV)
L 2 = 0.25 mm, hardness = 530 (HV)
L 3 part hardness = 730 (HV)
Conventional product 3: DP × 17 # 21, hardness of the entire needle = about 740 (HV)
表2の試験結果から明らかなように、本発明品2は、従来品3に比べて圧縮変形量が格段に小さく、針先の耐変形性に優れることが確認された。
As is apparent from the test results in Table 2, it was confirmed that the
(3)針先摩耗の比較試験
実際にミシンを用いて連続4時間縫製し、縫製後の針先の摩耗量を測定した。なお、針先摩耗の比較試験に用いたミシン針は以下の仕様になるものである。
本発明品3:UY×128GAS #9
L1=2.65mm、硬度=876(HV)
L2=0.38mm、硬度=550(HV)
L3部分の硬度=735(HV)
従来品4:UY×128GAS #9、針全体の硬度=約745(HV)
(3) Comparison test of needle tip wear Actual sewing was performed continuously for 4 hours using a sewing machine, and the amount of wear of the needle tip after sewing was measured. The sewing needle used for the comparison test of the needle tip wear has the following specifications.
Invention product 3: UY × 128 GAS # 9
L 1 = 2.65 mm, hardness = 876 (HV)
L 2 = 0.38 mm, hardness = 550 (HV)
L 3 part hardness = 735 (HV)
Conventional product 4: UY × 128GAS # 9, hardness of the entire needle = about 745 (HV)
表3から明らかなように、本発明品3は、4時間縫製後の摩耗量が従来品4の半分以下であり、耐摩耗性において格段に優れることが確認された。
As is apparent from Table 3, the
1 針本体部
2 針穴
3 針先部
4 針先端
L1 高硬度領域
L2 低硬度領域
L3 中硬度領域
1
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JPS5459450A (en) * | 1977-10-17 | 1979-05-14 | Toray Industries | Needle for processing fiber |
JP3584360B2 (en) * | 1995-05-12 | 2004-11-04 | オルガン針株式会社 | Sewing needle |
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CN106012351A (en) * | 2016-08-03 | 2016-10-12 | 吴江金叶织造有限公司 | Machine needle |
CN106012351B (en) * | 2016-08-03 | 2018-11-09 | 吴江金叶织造有限公司 | A kind of eedle |
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