JPH0889681A - Theread trimming device for sewing machine - Google Patents

Theread trimming device for sewing machine

Info

Publication number
JPH0889681A
JPH0889681A JP23297694A JP23297694A JPH0889681A JP H0889681 A JPH0889681 A JP H0889681A JP 23297694 A JP23297694 A JP 23297694A JP 23297694 A JP23297694 A JP 23297694A JP H0889681 A JPH0889681 A JP H0889681A
Authority
JP
Japan
Prior art keywords
thread
gripping
cutting blade
thread cutting
sewing machine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP23297694A
Other languages
Japanese (ja)
Inventor
Yoshiki Katayama
芳喜 片山
Yoshinori Bessho
芳則 別所
Motoaki Yamanashi
素明 山梨
Shigeaki Komatsu
慈明 小松
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Brother Industries Ltd
Original Assignee
Brother Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Brother Industries Ltd filed Critical Brother Industries Ltd
Priority to JP23297694A priority Critical patent/JPH0889681A/en
Publication of JPH0889681A publication Critical patent/JPH0889681A/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H54/00—Winding, coiling, or depositing filamentary material
    • B65H54/70—Other constructional features of yarn-winding machines
    • B65H54/71—Arrangements for severing filamentary materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)

Abstract

PURPOSE: To provide a thread trimming device for a sewing machine, allowing the improvement of the durability of a thread trimming cutter as well as easy assembly and adjustment. CONSTITUTION: Left needle thread and bobbin thread holders 8A and 8B, and right needle thread and bobbin thread holders 10A and 10B are formed to hold a thread 6 at positions immediately above and under a thread trimming cutter 24. Furthermore, the holders 8A and 8B as well as 10A and 10B are moved via a plunger 16 for holding the thread 6 by electrically energizing a solenoid 14. The thread 6 in a held condition is pressed to the cutter 24 for trimming.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、糸供給源から縫製部に
至る糸供給経路に糸を切断する糸切り刃を備えたミシン
の糸切り装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thread cutting device for a sewing machine having a thread cutting blade for cutting a thread in a thread supply path from a thread supply source to a sewing portion.

【０００２】[0002]

【従来の技術】従来、この種のミシンの糸切り装置とし
ては、そのほとんどが、移動刃と固定刃とを組にして糸
を切断するか、あるいは、二枚の移動刃同士を適宜の力
で押圧しつつ、その間に挟まれた糸を切断するようにな
っている。これはいわば、鋏と同じ原理で糸を切断しよ
うとするものである。2. Description of the Related Art Conventionally, most thread cutting devices of this type of sewing machine use a moving blade and a fixed blade as a set to cut the thread, or two moving blades have an appropriate force. While pressing with, the thread sandwiched between them is cut. This is, so to speak, an attempt to cut a thread by the same principle as scissors.

【０００３】この種の一般的な糸切り機構は図６に示す
ように構成されている。かかる糸切り装置の動作を図６
に基づいて以下に説明する。なお、図６は釜を取り外し
た状態を示している。A general thread cutting mechanism of this type is constructed as shown in FIG. The operation of the thread cutting device is shown in FIG.
It will be described below based on. Note that FIG. 6 shows a state in which the shuttle is removed.

【０００４】今、図示しない足踏みペダル等の操作によ
って糸切り動作の実行が指示されると、糸切りソレノイ
ド５０に電圧が印加され、プランジャ５２は図６の矢印
Ａ方向に所定のストロークで変位する。When a thread cutting operation is instructed by operating a foot pedal (not shown) or the like, a voltage is applied to the thread cutting solenoid 50 and the plunger 52 is displaced in a predetermined stroke in the direction of arrow A in FIG. .

【０００５】これに伴って糸切りカムレバ組５４が矢印
Ａ方向に変位する。糸切りカムレバ組５４に付属してい
るコロ軸５６も同時に矢印Ａ方向に変位し、糸切りカム
５８の円周上に移動する。また、糸切りカムレバ組５４
に付属している突起部６０も同時に矢印Ａ方向に移動
し、二又軸６２の切欠部６３内に深く進入する。二又軸
６２の軸部は、ミシン機枠に回動自在に固定されてい
る。Along with this, the thread trimming cam lever set 54 is displaced in the direction of arrow A. The roller shaft 56 attached to the thread trimming cam lever set 54 is also displaced in the direction of arrow A at the same time, and moves on the circumference of the thread trimming cam 58. In addition, the thread trimming cam lever set 54
At the same time, the protrusion 60 attached to the shaft also moves in the direction of arrow A and deeply enters into the notch 63 of the bifurcated shaft 62. The shaft portion of the bifurcated shaft 62 is rotatably fixed to the sewing machine frame.

【０００６】下軸６４が矢印Ｅ方向に回転するにつれ、
糸切りカム５８がコロ軸５６を矢印Ｃ方向に押し上げ、
糸切りカムレバ組５４を介して、二又軸６２に矢印Ｃ方
向の回転運動を伝達する。As the lower shaft 64 rotates in the direction of arrow E,
The thread trimming cam 58 pushes up the roller shaft 56 in the direction of arrow C,
Rotational movement in the direction of arrow C is transmitted to the bifurcated shaft 62 via the thread trimming cam lever set 54.

【０００７】二又軸６２に取り付けられた糸切りレバ６
６は、糸切り連桿６８を通じて糸切りホルダ７０に運動
を伝達し、糸切りホルダ７０は矢印Ｃ方向に回転運動す
る。なお、糸切りホルダ７０は下軸６４の回転軸と同一
直線上に回動自在に取り付けられている。A thread trimming lever 6 attached to the bifurcated shaft 62.
6 transmits the motion to the thread cutting holder 70 through the thread cutting connecting rod 68, and the thread cutting holder 70 rotates in the direction of arrow C. The thread trimming holder 70 is rotatably attached on the same straight line as the rotating shaft of the lower shaft 64.

【０００８】糸切りホルダ７０に取り付けられた移動刃
７２も矢印Ｃ方向に回転する。図７は、糸６が切断され
る直前における移動刃７２と固定刃７６の状態を断面で
示している。固定刃７６に対し移動刃７２が右方向に移
動し、相互に摺り合うことにより糸６は切断される。The movable blade 72 attached to the thread trimming holder 70 also rotates in the direction of arrow C. FIG. 7 shows in cross section the state of the movable blade 72 and the fixed blade 76 immediately before the yarn 6 is cut. The movable blade 72 moves to the right with respect to the fixed blade 76 and slides on each other, whereby the thread 6 is cut.

【０００９】また、下軸６４がさらに矢印Ｅ方向に回転
し、図示しない糸切りレババネの作用と糸切りカム５８
の形状により、糸切りカムレバ組５４、二又軸６２、糸
切り連桿６８、および糸切りホルダ７０がそれぞれ矢印
Ｄ方向に回転運動し、元の位置に復帰する。これに伴
い、移動刃７２と固定刃７６と離れる。Further, the lower shaft 64 further rotates in the direction of arrow E, and the action of a thread trimming lever spring (not shown) and the thread trimming cam 58 are performed.
With the shape, the thread trimming cam lever set 54, the bifurcated shaft 62, the thread trimming connecting rod 68, and the thread trimming holder 70 each rotate in the direction of arrow D and return to their original positions. Along with this, the movable blade 72 and the fixed blade 76 are separated from each other.

【００１０】糸切り終了の信号によって糸切りソレノイ
ド５０の印加電圧が零となり、圧縮されていたカムレバ
戻しバネ７４が元の長さに戻る。前記カムレバ戻しバネ
７４の作用により糸切りカムレバ組５４が矢印Ｂ方向に
押され、糸切りカムレバ組５４のコロ軸５６が糸切りカ
ム５８上から外れ、糸切り動作が完了する。The voltage applied to the thread trimming solenoid 50 becomes zero in response to the thread trimming completion signal, and the compressed cam lever return spring 74 returns to its original length. By the action of the cam lever return spring 74, the thread cutting cam lever set 54 is pushed in the direction of arrow B, the roller shaft 56 of the thread cutting cam lever set 54 is disengaged from the thread cutting cam 58, and the thread cutting operation is completed.

【００１１】[0011]

【発明が解決しようとする課題】しかしながら、上述し
たような鋏方式のミシンの糸切り装置では、移動刃及び
固定刃、あるいは、二枚の移動刃同士が押圧されつつ互
いに摺動するので、刃の移動手段として強力な動力源を
必要とする。糸の切断時には刃が互いに擦れ合うので、
刃が摩耗し易く、耐久性が劣る。However, in the thread cutting device of the scissors type sewing machine as described above, since the movable blade and the fixed blade or the two movable blades slide against each other while being pressed, Requires a powerful power source as a means of transportation. Since the blades rub against each other when cutting the thread,
The blade is easily worn and the durability is poor.

【００１２】また、移動刃及び固定刃、あるいは、二枚
の移動刃同士の接触状態如何によって糸の切れ味が異な
り、ミシンの組立時、あるいは、糸切り刃の交換時にお
ける調整が難しく、良好な切れ味を得るには、高い部品
精度と作業者の熟練とを必要とする欠点があった。Further, the sharpness of the thread is different depending on the contact state between the movable blade and the fixed blade, or the two movable blades, and it is difficult to adjust when assembling the sewing machine or exchanging the thread cutting blade. In order to obtain sharpness, there is a drawback that it requires high precision of parts and skill of an operator.

【００１３】本発明は、上述した問題点を解決するため
になされたものであり、糸切り刃の耐久性を向上させる
ことができ、しかも、組立調整が容易なミシンの糸切り
装置を提供することを目的としている。The present invention has been made in order to solve the above-mentioned problems, and provides a thread cutting device for a sewing machine, which can improve the durability of the thread cutting blade and can be easily assembled and adjusted. Is intended.

【００１４】[0014]

【課題を解決するための手段】前記目的を達成するため
に、本発明のミシンの糸切り装置は、糸供給源から縫製
部に至る糸供給経路に糸を切断する糸切り刃を備えたミ
シンの糸切り装置において、前記糸切り刃による糸切り
位置の両側近傍に、糸切りに際して糸を固定的に把持
し、かつ前記糸切り刃と相接近する方向に相対的に移動
して前記糸を前記糸切り刃に押し付けその糸を切断させ
る可動糸把持手段を備えている。In order to achieve the above object, a thread cutting device for a sewing machine according to the present invention is provided with a thread cutting blade for cutting a thread in a thread supply path from a thread supply source to a sewing portion. In the thread cutting device, the thread is fixedly gripped during thread cutting near both sides of the thread cutting position by the thread cutting blade, and the thread is relatively moved in a direction approaching the thread cutting blade to move the thread. Movable thread gripping means for pressing the thread cutting blade to cut the thread is provided.

【００１５】なお、前記可動糸把持手段は、前記糸切り
刃による糸切り位置の上下両側近傍において、それぞれ
糸を固定的に把持する状態及び糸を開放する状態をとり
得ると共に、それぞれ糸を把持した状態で糸の供給方向
と交差する方向に移動可能な上下各一対の糸把持片によ
って構成し、前記糸を把持した状態の前記各一対の糸把
持片を移動させて、前記把持された糸を前記糸切り刃に
押し付けるように作用する駆動手段を備えるようにして
もよい。The movable thread gripping means can be in a state of fixedly gripping the thread and a status of releasing the thread near the upper and lower sides of the thread cutting position by the thread cutting blade, and gripping the thread respectively. The pair of upper and lower thread gripping pieces that are movable in the direction intersecting the thread supply direction in the above state, the pair of thread gripping pieces that grips the thread are moved to move the gripped thread. May be provided with a drive means that acts to press the thread cutting blade against the thread cutting blade.

【００１６】そして、前記糸を開放した状態において、
前記上下各一対の糸把持片を常には糸から離隔した位置
に配置させる弾性手段を備えるようにしてもよい。Then, in a state where the thread is released,
An elastic means may be provided for arranging the pair of upper and lower thread gripping pieces at positions that are always separated from the thread.

【００１７】また、前記糸切り刃を、前記上下各一対の
糸把持片の片側の上下両糸把持片の間に固定的に配置
し、前記片側の上下両糸把持片を、それぞれその先端の
糸把持部が前記糸切り刃の先端部よりも突出する位置
と、糸切り刃の先端部よりも後退する位置との間に移動
可能に装置すると共に、常には前記突出する位置に配置
するようにしてもよい。Further, the thread cutting blade is fixedly arranged between the upper and lower thread gripping pieces on one side of the pair of upper and lower thread gripping pieces, and the upper and lower thread gripping pieces on one side of the thread gripping pieces are respectively attached to the tip ends thereof. The thread gripper is arranged so as to be movable between a position projecting from the tip of the thread cutting blade and a position retracting from the tip of the thread cutting blade, and is always arranged in the projecting position. You may

【００１８】さらに、前記糸切り刃及び可動糸把持手段
を針板の直下位置に配置するようにしてもよい。Further, the thread cutting blade and the movable thread gripping means may be arranged directly below the needle plate.

【００１９】[0019]

【作用】前記の構成を有する本発明のミシンの糸切り装
置によれば、可動糸把持手段は、糸切りに際し、糸切り
刃による糸切り位置の両側近傍において糸を固定的に把
持し、かつ前記糸切り刃と相接近する方向に相対的に移
動して前記糸を前記糸切り刃に押し付けその糸を切断さ
せる。According to the thread cutting device of the present invention having the above-mentioned structure, the movable thread gripping means fixedly grips the thread near both sides of the thread cutting position by the thread cutting blade during thread cutting, and The yarn cutting blade is relatively moved in a direction in which the yarn cutting blade moves closer to the yarn cutting blade, and the yarn is pressed against the yarn cutting blade to cut the yarn.

【００２０】なお、前記可動糸把持手段を前記上下各一
対の糸把持片によって構成した場合、糸を切断する際に
は前記各対の糸把持片によって糸を固定的に把持し、糸
を切断しないときは前記各対の糸把持片を離間させて糸
を開放させる。そして、糸を切断するときは、その糸を
固定的に把持した前記各対の糸把持片を駆動手段によっ
て移動させることにより、前記糸を糸切り刃に押し付け
て切断させる。なお、糸を切断しないときは、前記各対
の糸把持片が糸を開放した位置に配置されているので、
その各対の糸把持片は縫製に伴う糸の消費に支障をきた
さない。When the movable thread gripping means is composed of the pair of upper and lower thread gripping pieces, when the thread is cut, the thread is fixedly gripped by the pair of thread gripping pieces and the thread is cut. If not, the yarn gripping pieces of each pair are separated to release the yarn. When the thread is cut, the pair of thread gripping pieces that fixedly grip the thread are moved by the driving means to press the thread against the thread cutting blade to cut the thread. When the thread is not cut, the pair of thread gripping pieces are arranged at the position where the thread is released,
The thread gripping pieces of each pair do not hinder the consumption of threads during sewing.

【００２１】そして、前記糸を開放した状態において、
前記上下各一対の糸把持片を弾性手段によって常には糸
から離隔した位置に配置するようにした場合、この状態
の糸把持片は縫製振動等によって盲動するようなことが
なく、縫製に伴う糸の消費に支障をきたさない状態を一
層確実にすることができる。Then, in a state where the yarn is released,
When the pair of upper and lower thread gripping pieces are always arranged at a position separated from the thread by the elastic means, the thread gripping piece in this state does not blindly move due to sewing vibration or the like, and the thread accompanying the sewing It is possible to further ensure the state that does not hinder the consumption of.

【００２２】また、前記糸切り刃を、前記上下各一対の
糸把持片の片側の上下両糸把持片の間に固定的に配置す
る一方、前記片側の上下両糸把持片を、それぞれその先
端の糸把持部が前記糸切り刃の先端部よりも突出する位
置と、糸切り刃の先端部よりも後退する位置との間に移
動可能に装置すると共に、常には前記突出する位置に配
置するよう構成すれば、糸の切断に際して、その糸を糸
切り刃に押し付ける前にその糸を前記各対の糸把持片に
よって確実に固定把持しておくことができ、把持途中の
状態のままで糸を糸切り刃に作用させるようなことがな
い。Further, the thread cutting blade is fixedly arranged between the upper and lower thread gripping pieces on one side of the pair of upper and lower thread gripping pieces, while the upper and lower thread gripping pieces on the one side are respectively provided at their tips. The yarn gripping part is movably arranged between a position projecting from the tip of the thread cutting blade and a position retracting from the tip of the thread cutting blade, and is always arranged in the projecting position. According to this structure, at the time of cutting the thread, the thread can be securely fixed and gripped by the pair of thread gripping pieces before the thread is pressed against the thread cutting blade, and the thread is held in the state of being gripped. Does not act on the thread cutting blade.

【００２３】さらに、前記糸切り刃及び可動糸把持手段
を針板の直下位置に配置した場合、糸を針板の直下で切
断することができ、糸切り終了後の縫製布の長さを短く
することができ、縫製品質の向上を図ることができる。Further, when the thread cutting blade and the movable thread gripping means are arranged directly below the needle plate, the thread can be cut immediately below the needle plate, and the length of the sewing cloth after the thread cutting is shortened. It is possible to improve the quality of sewn products.

【００２４】[0024]

【実施例】以下に、本発明を具体化した一実施例を図面
を参照して説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to the drawings.

【００２５】図１は、糸切りミシンのベッドの下部に設
けた可動糸把持装置の構造を示している。FIG. 1 shows the structure of a movable thread gripping device provided at the bottom of a bed of a thread trimming sewing machine.

【００２６】針板２には、針孔４が設けられており、糸
６が針孔４内を通っている。針板２の下側には、前記糸
６を挟んで可動糸把持手段が設けられている。即ち、図
１において、糸６の左側には、上、下糸把持片８Ａ，８
Ｂを備えた断面略コ字状の一側糸把持体８が配置され、
その一側糸把持体８は、駆動手段としてのソレノイド１
４のプランジャ１６の一端部に固定され、そのプランジ
ャ１６の移動によって水平方向に移動可能とされる。そ
の上、下糸把持片８Ａ，８Ｂの先端部にはそれぞれ凸状
糸把持部８Ｃが形成される。その一側糸把持体８と、ソ
レノイド１４の外ケースとの間には、弾性手段としての
一対の引っ張りバネ１８が張設され、その引っ張りバネ
１８は前記一側糸把持体８を常には前記糸６から離間す
る方向に付勢している（図１参照）。A needle hole 4 is provided in the needle plate 2, and a thread 6 passes through the needle hole 4. On the lower side of the needle plate 2, a movable thread gripping means is provided with the thread 6 interposed therebetween. That is, in FIG. 1, on the left side of the thread 6, the upper and lower thread gripping pieces 8A, 8
A one-side thread gripping body 8 having a substantially U-shaped cross section is arranged,
The one side thread gripping body 8 is a solenoid 1 as a driving means.
4 is fixed to one end of the plunger 16 and can be moved in the horizontal direction by the movement of the plunger 16. In addition, convex thread gripping portions 8C are formed at the tips of the lower thread gripping pieces 8A and 8B, respectively. A pair of tension springs 18 as elastic means are stretched between the one-side thread gripping body 8 and the outer case of the solenoid 14, and the tension springs 18 keep the one-side thread gripping body 8 at the above-mentioned position. It is biased in a direction away from the yarn 6 (see FIG. 1).

【００２７】一方、前記糸６の右側には、針板２の下側
に位置してケーシング２０が固定配置される。そのケー
シング２０には、前記上、下糸把持片８Ａ，８Ｂと水平
方向に一致する各位置においてそれぞれ糸６側に開口し
た案内孔２０Ａ，２０Ｂが設けられる。前記各案内孔２
０Ａ，２０Ｂには、他側の糸把持体としての上、下糸把
持片１０Ａ，１０Ｂが水平方向に移動可能に嵌合支持さ
れ、左方向への移動が前記案内孔２０Ａ，２０Ｂの中間
段部に係合するストッパピン１１によって図１の図示位
置に規制されるようになっている。その各上、下糸把持
片１０Ａ，１０Ｂは、それぞれ前記案内孔２０Ａ，２０
Ｂの内部に挿入配置された圧縮バネ２２によって常には
図１の図示位置に弾発配置され、その各先端部にはそれ
ぞれ前記凸状糸把持部８Ｃと協働して糸６を挟持するた
めの凹状糸把持部１０Ｃが形成される。On the other hand, on the right side of the thread 6, a casing 20 is fixedly arranged below the needle plate 2. The casing 20 is provided with guide holes 20A and 20B which are open to the yarn 6 side at respective positions which coincide with the upper and lower thread gripping pieces 8A and 8B in the horizontal direction. Each guide hole 2
Upper and lower bobbin thread gripping pieces 10A and 10B, which are thread grippers on the other side, are fitted and supported on 0A and 20B so as to be movable in the horizontal direction, and the movement to the left is an intermediate step of the guide holes 20A and 20B. The stopper pin 11 that engages with the portion regulates the position shown in FIG. On top of that, the lower thread gripping pieces 10A, 10B are respectively provided with the guide holes 20A, 20B.
The compression spring 22 inserted into the inside of B always elastically disposes at the position shown in FIG. 1, and the tip end of each of the springs cooperates with the convex thread gripping portion 8C to clamp the thread 6. The concave thread grip portion 10C is formed.

【００２８】前記上、下糸把持片１０Ａ，１０Ｂの間に
おいて前記ケーシング２０の側面には、先端部が鋭利に
形成された糸切り刃２４が固定される。その糸切り刃２
４の先端部は、図１に示されるように、通常の突出した
位置に配置された前記上、下糸把持片１０Ａ，１０Ｂの
先端部よりも僅か右側に引っ込んだ位置に配置されてい
る。従って、糸切断時以外は、その糸切り刃２４が糸６
に接触するようなことがない。A thread cutting blade 24 having a sharp tip is fixed to the side surface of the casing 20 between the upper and lower thread gripping pieces 10A and 10B. The thread cutting blade 2
As shown in FIG. 1, the tip portion of No. 4 is arranged at a position slightly retracted to the right of the tip portions of the upper and lower thread gripping pieces 10A and 10B which are normally arranged at the projecting position. Therefore, except when the thread is cut, the thread cutting blade 24 makes the thread 6
There is no contact with.

【００２９】前記ソレノイド１４は、適当な電圧が印加
されると、図１において、プランジャ１６及び一側糸把
持体８を引っ張りバネ１８の作用に抗して右方向に移動
させる。一方、ソレノイド１４の電圧印加を零にする
と、引っ張りバネ１８の作用によって、一側糸把持体８
及びプランジャ１６は左方向に移動して原位置に復帰す
る。When an appropriate voltage is applied, the solenoid 14 moves the plunger 16 and the one-side thread gripper 8 in the right direction against the action of the tension spring 18 in FIG. On the other hand, when the voltage applied to the solenoid 14 is set to zero, the tension spring 18 acts so that the one-side thread gripper 8
And the plunger 16 moves leftward and returns to the original position.

【００３０】以下に、前記構成に基づくミシンの糸切り
装置の作用について説明する。The operation of the thread cutting device of the sewing machine based on the above construction will be described below.

【００３１】今、糸切り動作の実行を指示するために、
例えば、図示しない足踏みペダル等の操作によって糸切
りスイッチをＯＮにすると、ソレノイド１４に電圧が印
加され、そのソレノイド１４は、引っ張りバネ１８を伸
ばしつつ、プランジャ１６及び一側糸把持体８を右方向
に移動させる。Now, in order to instruct the execution of the thread cutting operation,
For example, when the thread trimming switch is turned on by operating a foot pedal (not shown) or the like, a voltage is applied to the solenoid 14, and the solenoid 14 extends the tension spring 18 and moves the plunger 16 and the one side thread gripping body 8 to the right. Move to.

【００３２】一側糸把持体８が右に移動すると、その
上、下糸把持片８Ａ，８Ｂは糸６を右方向に押す。やが
て、押される糸６が右側の上、下糸把持片１０Ａ，１０
Ｂに接触し、そして、左側の上、下糸把持片８Ａ，８Ｂ
及び右側の上、下糸把持片１０Ａ，１０Ｂによって糸６
が把持される。図２はこの状態を示している。When the one side thread gripping body 8 moves to the right, the lower thread gripping pieces 8A and 8B push the thread 6 to the right. Eventually, the thread 6 to be pushed is on the upper right side, and the lower thread gripping pieces 10A, 10
B, and the upper left side, lower thread gripping pieces 8A, 8B
And the upper right side, the thread 6 by the lower thread gripping pieces 10A, 10B.
Is gripped. FIG. 2 shows this state.

【００３３】左側の上、下糸把持片８Ａ，８Ｂが右方向
に移動すると、右側の上、下糸把持片１０Ａ，１０Ｂに
付属させた圧縮バネ２２を縮ませながら上、下糸把持片
１０Ａ，１０Ｂが右方向に移動するため、糸切り刃２４
が露出し始め、その後、糸６が糸切り刃２４に直接接触
する。図３はこの状態を示している。When the left upper and lower thread gripping pieces 8A and 8B move to the right, the upper and lower thread gripping pieces 10A are compressed while compressing the compression spring 22 attached to the right upper and lower thread gripping pieces 10A and 10B. , 10B moves to the right, the thread cutting blade 24
Starts to be exposed, and then the thread 6 directly contacts the thread cutting blade 24. FIG. 3 shows this state.

【００３４】さらに、左側の上、下糸把持片８Ａ，８Ｂ
が右方向に移動すると、糸６は糸切り刃２４に押圧さ
れ、その糸６の上、下部が左側の上、下糸把持片８Ａ，
８Ｂ及び右側の上、下糸把持片１０Ａ，１０Ｂに把持固
定されているので、容易に切断される。図４はこの状態
を示している。Further, the upper left and lower thread gripping pieces 8A, 8B
When the thread 6 moves to the right, the thread 6 is pressed by the thread cutting blade 24, the upper and lower parts of the thread 6 are on the left side, and the lower thread gripping piece 8A,
8B and the right side, the upper and lower threads are gripped and fixed to the lower thread gripping pieces 10A and 10B, so that they are easily cut. FIG. 4 shows this state.

【００３５】糸６の切断終了後、ソレノイド１４の印加
電圧を零にすると、引っ張りバネ１８が縮むことによ
り、プランジャ１６及び左側の上、下糸把持片８Ａ，８
Ｂは左方向に移動する。同時に、ケーシング２０内の圧
縮バネ２２が元の状態に伸び、右側の上、下糸把持片１
０Ａ，１０Ｂは左の突出した位置に移動し、糸切り刃２
４は、再び、上、下糸把持片１０Ａ，１０Ｂの間の引っ
込んだ位置に相対的に配置されることになる。図５はこ
の状態を示している。以上によって、糸切り動作が完了
する。After the thread 6 has been cut, when the voltage applied to the solenoid 14 is set to zero, the tension spring 18 contracts, and the plunger 16 and the left upper and lower thread gripping pieces 8A, 8
B moves to the left. At the same time, the compression spring 22 inside the casing 20 expands to its original state, and the upper and lower thread gripping pieces 1 on the right side
0A and 10B move to the left protruding position, and the thread cutting blade 2
4 is again arranged relatively in the retracted position between the upper and lower thread gripping pieces 10A and 10B. FIG. 5 shows this state. With the above, the thread cutting operation is completed.

【００３６】なお、本発明のミシンの糸切り装置は、前
記実施例例に限定されるものではない。The thread cutting device of the sewing machine of the present invention is not limited to the above embodiment.

【００３７】前記実施例では、可動糸把持手段を構成し
ている左側の上、下糸把持片８Ａ，８Ｂ及び右側の上、
下糸把持片１０Ａ，１０Ｂの凸状糸把持部８Ｃ及び凹状
糸把持部１０Ｃにおける糸６に接する面の形状を凹凸と
したが、要するに、糸把持時に糸６が滑らない構成であ
ればいかなる形状でもよい。例えば、糸把持部の糸に接
する面を粗くしたり、あるいは、糸に接する面に微粒子
を付着させる等により、糸把持部と糸との摩擦係数を大
きくすることが考えられる。In the above embodiment, the upper left side, the lower thread gripping pieces 8A, 8B and the upper right side, which constitute the movable thread gripping means,
The convex thread gripping portions 8C and the concave thread gripping portions 10C of the lower thread gripping pieces 10A and 10B have uneven shapes on the surfaces in contact with the thread 6, but any shape is acceptable as long as the thread 6 does not slip when gripping the thread. But it's okay. For example, it is conceivable to increase the friction coefficient between the thread gripping portion and the thread by roughening the surface of the thread gripping portion in contact with the thread or by adhering fine particles to the surface in contact with the thread.

【００３８】また、前記実施例では、駆動手段をソレノ
イド１４及びプランジャ１６によって構成されている
が、その他の構成も考えられる。例えば、エアシリンダ
やリニアモータ等であってもよい。Further, in the above embodiment, the driving means is constituted by the solenoid 14 and the plunger 16, but other constitutions are conceivable. For example, an air cylinder or a linear motor may be used.

【００３９】[0039]

【発明の効果】以上説明したことから明かなように、本
発明のミシンの糸切り装置は、従来のミシンの糸切り装
置のように、固定刃と移動刃とを組み合わせたもの、あ
るいは移動刃と移動刃とを組み合わせたもののような、
摺動による摩擦滅失が発生せず、糸切り刃の耐久性を向
上させることができる。また、可動糸把持手段と糸切り
刃とが非接触で糸の切断を行なうため、部品についても
従来のような高い精度は必要とされず、組立調整が容易
であり作業者の熟練も不要となる等の優れた効果を奏す
る。As is apparent from the above description, the thread cutting device for a sewing machine of the present invention is a combination of a fixed blade and a movable blade, or a moving blade, like the thread cutting device for a conventional sewing machine. And a moving blade,
The friction loss due to sliding does not occur, and the durability of the thread cutting blade can be improved. Further, since the movable thread gripping means and the thread cutting blade do not contact each other to cut the thread, the parts are not required to have the high precision required in the conventional art, the assembly and adjustment are easy, and the skill of the operator is not required. It has excellent effects such as

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

【図１】本発明を具体化した一実施例のミシンの糸切り
装置の要部断面図である。FIG. 1 is a sectional view of an essential part of a thread cutting device for a sewing machine according to an embodiment of the present invention.

【図２】糸切り動作を開始した状態を示す断面図であ
る。FIG. 2 is a cross-sectional view showing a state in which a thread cutting operation has started.

【図３】糸切り動作の途中で糸が刃に接触している状態
を示す断面図である。FIG. 3 is a cross-sectional view showing a state in which the thread is in contact with the blade during the thread cutting operation.

【図４】糸切り動作の途中で糸が切断された直後の状態
を示す断面図である。FIG. 4 is a cross-sectional view showing a state immediately after a thread is cut during a thread cutting operation.

【図５】糸切り動作が完了した状態を示す断面図であ
る。FIG. 5 is a cross-sectional view showing a state where the thread cutting operation is completed.

【図６】従来のミシンの糸切り機構を示す斜視図であ
る。FIG. 6 is a perspective view showing a thread cutting mechanism of a conventional sewing machine.

【図７】従来のミシンの糸切り機構において、糸の切断
直前の状態を示す図である。FIG. 7 is a view showing a state just before the thread is cut in the thread cutting mechanism of the conventional sewing machine.

【符号の説明】[Explanation of symbols]

２ 針板 ６ 糸 ８ 一側糸把持体 ８Ａ 上糸把持片 ８Ｂ 下糸把持片 １０Ａ 上糸把持片 １０Ｂ 下糸把持片 １４ ソレノイド １６ プランジャ １８ 引っ張りバネ ２２ 圧縮バネ ２４ 糸切り刃 2 Needle plate 6 Thread 8 One side thread gripping body 8A Upper thread gripping piece 8B Lower thread gripping piece 10A Upper thread gripping piece 10B Lower thread gripping piece 14 Solenoid 16 Plunger 18 Pulling spring 22 Compression spring 24 Thread cutting blade

フロントページの続き (72)発明者 小松 慈明 名古屋市瑞穂区苗代町15番１号ブラザー工 業株式会社内Continuation of front page (72) Inventor Cimei Komatsu 15-1 Naeshiro-cho, Mizuho-ku, Nagoya City Brother Industries, Ltd.

Claims (5)

【特許請求の範囲】[Claims] 【請求項１】 糸供給源から縫製部に至る糸供給経路に
糸を切断する糸切り刃を備えたミシンの糸切り装置にお
いて、 前記糸切り刃による糸切り位置の両側近傍に、糸切りに
際して糸を固定的に把持し、かつ前記糸切り刃と相接近
する方向に相対的に移動して前記糸を前記糸切り刃に押
し付けその糸を切断させる可動糸把持手段を備えたこと
を特徴とするミシンの糸切り装置。1. A thread cutting device of a sewing machine, comprising a thread cutting blade for cutting a thread in a thread supply path from a thread supply source to a sewing section, in the vicinity of both sides of a thread cutting position by the thread cutting blade, in thread cutting. A movable thread gripping means for gripping the thread fixedly, and relatively moving in a direction approaching the thread cutting blade to press the thread against the thread cutting blade to cut the thread. Sewing machine thread cutting device. 【請求項２】 前記可動糸把持手段は、前記糸切り刃に
よる糸切り位置の上下両側近傍において、それぞれ糸を
固定的に把持する状態及び糸を開放する状態をとり得る
と共に、それぞれ糸を把持した状態で糸の供給方向と交
差する方向に移動可能な上下各一対の糸把持片によって
構成し、 前記糸を把持した状態の前記各一対の糸把持片を移動さ
せて、前記把持された糸を前記糸切り刃に押し付けるよ
うに作用する駆動手段を備えたことを特徴とする請求項
１に記載のミシンの糸切り装置。2. The movable thread gripping means can be in a state of fixedly gripping the thread and in a state of releasing the thread near the upper and lower sides of the thread cutting position by the thread cutting blade, and gripping the thread respectively. The upper and lower thread gripping pieces that are movable in a direction intersecting the thread supply direction in the state where the thread is gripped, and the pair of thread gripping pieces that are gripping the thread are moved to move the gripped thread. 2. The thread trimming device for a sewing machine according to claim 1, further comprising a driving unit that acts to press the thread cutting blade against the thread cutting blade. 【請求項３】 前記糸を開放した状態において、前記上
下各一対の糸把持片を常には糸から離隔した位置に配置
させる弾性手段を備えたことを特徴とする請求項２に記
載のミシンの糸切り装置。3. The sewing machine according to claim 2, further comprising elastic means for arranging the pair of upper and lower thread gripping pieces at positions which are always separated from the thread when the thread is opened. Thread trimming device. 【請求項４】 前記糸切り刃を、前記上下各一対の糸把
持片の片側の上下両糸把持片の間に固定的に配置し、前
記片側の上下両糸把持片を、それぞれその先端の糸把持
部が前記糸切り刃の先端部よりも突出する位置と、糸切
り刃の先端部よりも後退する位置との間に移動可能に装
置すると共に、常には前記突出する位置に配置したこと
を特徴とする請求項２に記載のミシンの糸切り装置。4. The thread cutting blade is fixedly arranged between the upper and lower thread gripping pieces on one side of the pair of upper and lower thread gripping pieces, and the upper and lower thread gripping pieces on one side are respectively attached to the tip ends of the thread gripping pieces. The thread gripper is arranged so as to be movable between a position projecting from the tip of the thread cutting blade and a position retracting from the tip of the thread cutting blade, and is always arranged in the projecting position. The thread cutting device for a sewing machine according to claim 2, wherein 【請求項５】 前記糸切り刃及び可動糸把持手段を針板
の直下位置に配置したことを特徴とする請求項１に記載
のミシンの糸切り装置。5. The thread cutting device for a sewing machine according to claim 1, wherein the thread cutting blade and the movable thread gripping means are arranged directly below the needle plate.
JP23297694A 1994-09-28 1994-09-28 Theread trimming device for sewing machine Pending JPH0889681A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP23297694A JPH0889681A (en) 1994-09-28 1994-09-28 Theread trimming device for sewing machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP23297694A JPH0889681A (en) 1994-09-28 1994-09-28 Theread trimming device for sewing machine

Publications (1)

Publication Number Publication Date
JPH0889681A true JPH0889681A (en) 1996-04-09

Family

ID=16947844

Family Applications (1)

Application Number Title Priority Date Filing Date
JP23297694A Pending JPH0889681A (en) 1994-09-28 1994-09-28 Theread trimming device for sewing machine

Country Status (1)

Country Link
JP (1) JPH0889681A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2952615A1 (en) * 2014-06-04 2015-12-09 Maschinenfabrik Rieter AG Method and a thread cutting device for clamping and cutting a yarn
CN105645176A (en) * 2014-11-19 2016-06-08 金华市鹰豪电子机械有限公司 Intelligent thread separation plate sewing equipment

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2952615A1 (en) * 2014-06-04 2015-12-09 Maschinenfabrik Rieter AG Method and a thread cutting device for clamping and cutting a yarn
CN105293186A (en) * 2014-06-04 2016-02-03 里特机械公司 Method for clamping and separating a yarn and a yarn separating device
CN105645176A (en) * 2014-11-19 2016-06-08 金华市鹰豪电子机械有限公司 Intelligent thread separation plate sewing equipment
CN105645176B (en) * 2014-11-19 2018-11-20 金华市鹰豪电子机械有限公司 A kind of intelligence distributor plate sewing device

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