JPH0317517B2

JPH0317517B2 -

Info

Publication number: JPH0317517B2
Application number: JP61221226A
Authority: JP
Inventors: Tozo Muraoka
Original assignee: Individual
Current assignee: Individual
Priority date: 1986-09-19
Filing date: 1986-09-19
Publication date: 1991-03-08
Also published as: JPS6377490A

Description

【発明の詳細な説明】［発明の目的］（産業上の利用分野）本発明は、まつり縫いミシン、特に縫い始め及
び縫い終り時における糸の端末処理を考慮したま
つり縫いミシンに関するものである。（従来の技術）まつり縫いとは周知のように、ズボンの裾等の
折り返し部分を縫着する場合に使用される、一種
のかがり縫いであり、まつり縫いミシンによつて
縫製がなされる。上記ミシンを自動化するため、第６図に示され
るように、出願人は既に特願昭60−185557号（特
開昭62−44286）を提案した。第６図はまつり縫いミシンの要部のみを示して
おり、その概要はミシン本体１に針の収納装置２
を設け、この内部にある針を針の装着装置３を用
いて装着し、糸通し手段４を用いて針穴に糸を通
し、更に糸切り手段（第６図ではソレノイド７に
よつてリンク６，５に伝達し、最終的には支点８
を中心としてリンク５にて糸切り手段を作動させ
るようになつている。）によつて糸を切る構成と
し、前記各操作を半自動化したものである。そして、９は針であつて、針振腕１０に取付け
られ、針台１２に設けられた針通路１３内を左側
底部から右側上部にかけて時計の振子状に往復運
動する。又、ルーパー１１は図示しない上軸の動作によ
り、押え受け１４上を時計の振子状に往復運動
し、前記した針９とルーパー１１との関係によ
り、まつり縫いが行なわれる。なお、支持材１５の下部内側には糸切り手段１
６があり、前記したリンク５の端部で、後述する
押圧棒の頭部１７を押圧する構成となつている。第７図は、第６図を矢印方向から見た糸切り手
段のみの図である。前記した通り、支持材１５の
下部内側には、頭部１７と一体になつた押圧棒１
８がスプリング１９によつて移動自由に取付けら
れ、その先端には直線状の刃部２０に対して回動
自在な刃部２１が設けられ、押圧棒１８の押圧操
作によつて刃部２０が前進し、この前進動作に応
じて回動自在な刃部２１が回動し、ルーパー１１
によつて支持状態にある糸２２を切るようになつ
ている。即ち、各刃部が前進してルーパー１１の剱先内
にまで入り込み、この部分で引掛けてきた糸２２
を切断する。（発明が解決しようとする問題点）上記した構成において、糸を切断した場合に第
８図に示されるように、縫い始め部分と終り部
分に糸が残つてしまう。従つて、この糸を所定長さ、即ち、布の上部に
やや出る程度に仕上げるために、改めて残つてい
る糸を切り揃えなければならず、このため工数が
増える問題があつた。上記したものは、縫い上つた製品に関する話と
して行なつたが、ミシン針に残つた糸についても
次のような問題点がある。即ち、針穴には、所定寸法の糸が残つて挿通状
態にあり、次に縫う場合に針は、第６図にて説明
した通り針台１２に設けた針通路１３内を左側底
部から右側上部にかけて移動する。この場合、糸
は糸調子皿（第６図２３）にて所定の引張力が与
えられているため、針が針通路１３内を移動して
糸のループを作る間に針穴から糸が抜けてゆき、
残り少なくなつた状態にて針が布から抜けてゆく
（縫目が出来る）ことになり、この針が布から抜
けてゆく過程で、糸が抜けてしまう。従つて、この状態で何回か縫う状態を経た後
に、糸が繰れてきて縫える状態になるが、それま
では縫うことが出来ない欠点を有している。本発明は上記問題点を解決するためになされた
ものであり、縫い始めと縫い終りに所定の糸の長
さを自動的に残して、切り揃えの不要なまつり縫
いミシンを提供することを目的としている。［発明の構成］（問題点を解決するための手段）上記目的を達成するため、本発明はソレノイド
の付勢をリンクを介して糸切り手段に伝え、ルー
パーの剱先に係止した糸を切断する構成を有する
まつり縫いミシンにおいて、前記リンクに連動し
て作動するように設けた糸のたぐり機構と、ルー
パーの剱先が糸切り手段の刃部の面と90゜の位置
になつたことを検出する糸の切断タイミング検出
機構とから構成した。（作用）したがつてリンクに糸のたぐり機構を設けてい
るため、糸の切断と同時に糸をたぐることがで
き、更に、送り台に糸の切断タイミング検出機構
を設けているため、そのタイミングを目視でき
る。（実施例）以下図面を参照して実施例を説明する。第１図は本発明によるまつり縫いミシンを説明
する一実施例の構成図である。そして、本発明によるまつり縫いミシンでは、
縫製工程に先がけて糸のたぐり工程を入れ、この
たぐり工程を糸の切断工程と同時に行ない、又、
糸の切断タイミングを、ルーパーの最も立つた状
態時（針の最上位）としたものである。即ち、ルーパーの最も立つた状態が最も糸を切
り易い状態であることに着目し、この状態を検出
して糸を切ると同時に、この操作に合せて糸の必
要長さ（次に縫製する場合、最初の縫目上に突出
して残る長さ）を確保するようにしている。第１図において、第６図と同一部分については
同一符号を付している。第１図において、２４は糸のたぐり機構であ
り、２枚の起立板２５，２５の間にリンク６を挿
通し、前記各起立板２５，２５とリンク６に穴２
６を設け、この穴を介して糸２２を挿入した後、
針穴へ通すようにしている。なお、糸のたぐり機構２４全体は、基板２７と
一体に形成され、ネジ２８によつて取付位置を調
整できるようになつている。２９は糸の切断タイミング検出機構であり、指
示片３０の先端３１が指示位置３２上にきた時を
最も良い切断タイミングとする。なお、この件に
関しては後に詳記する。次に、動作説明をする。第１図において、本発明にて新たに追加した部
分、即ち、糸のたぐり機構２４及び糸の切断タイ
ミング機構は、まつり縫いミシンの本来的な処理
そのものには、何らの影響を与えるものではな
い。従つて、針振腕１０に固定された針９は、図示
しない針振軸の往復運動に従い、針台１２に設け
た針通路１３内を左側底部から右側上部にかけて
時計の振子状に往復運動する。一方、ルーパー１１も前記動作に応じて押え受
け１４上を時計の振子状に往復運動し、まつり縫
いが行なわれる。なお、まつり縫い自体は、そのミシンの構造及
び動作が周知であるため、これ以上は詳記しな
い。この状態にて順次縫い進むと、第１図に示さ
れるように、糸は順次たぐられて、即ち、糸のた
ぐり機構２４の起立板２５，２５とリンク６の穴
２６内を順次進み、この動作に応じてまつり縫い
が完成してゆく。第２図は糸のたぐり機構２４を上から見た図で
あり、糸２２の状態は実線で示される。第３図は糸の切断タイミングを説明する図であ
り、この図は第１図の矢印方向から見た概要図で
ある。即ち、第３図は刃部２０，２１からなる糸
切り手段と、針９とルーパー１１との相互位置関
係のみを示したものである。前記した縫製動作によつて順次縫い進まれてゆ
き、所定最終点に到達したとする。この場合、針
９に着目すると、当然のことながら針穴３３内に
糸２２を通した状態で、実線矢印に従つた往復運
動を行なつている。即ち、位置から位置への往復運動である。
なお、針がの位置にある時は、ルーパー１１は
′位置にあつて、最も立つた状態（ルーパーの
剱先が糸切り手段の刃部２０，２１の面とほぼ
90゜となつた状態）にあり、この状態から針９が
方向へ移動するにつれて、ルーパー１１は一旦
後退し、更に方向へ向けて矢印に沿つて横移動
する。この横移動時に、今まで立つた状態にあつ
たルーパー１１は、順次横に寝た状態となり、
点にて糸をすくつて′点に至り、最も立つた状
態となる。この′点を検出して、ソレノイド７を付勢す
ると、リンク６の吸引動作に応じてリンク５が糸
切り手段の頭部１７を押圧し、刃部２０，２１を
前進させ、ルーパー１１の剱先内にて糸２２が切
断される。なお、ソレノイド７の付勢時では、第２図に示
されるように、リンク６がリンク５方向に移動
し、それまで起立板２５の穴２６と合つていたリ
ンク６が移動することにより、第２図で示される
点線状のたるみ（余分にたぐり寄せられた糸）が
できる。この糸のたるみについて、次に説明する。第３図のルーパー′位置にて、糸が切られる
ことは既に説明した。この位置は、まつり縫いの
完了した位置であり、しかも糸の終端から所定の
長さで切ることが出来る。一方、この位置は、針が最も高い位置にあり、
しかもこの位置にて糸を切つたために、糸は針穴
へ挿通されてはいるが、その長さは最も短い。従つて、この状態で次のまつり縫いを開始する
こととなるが、針がこの状態から方向へ移動を
開始すると、何らの引張力を与えずに、たるみが
ついてきて、針が最も伸びた状態にて、即ち、針
台１２の端部まで針が進んで、前記余分な糸を用
いてループができる。この余分なたるみの長さを調整すれば、まつり
縫いの縫い始めに所定の長さの糸を残すことが可
能となる。なお、前記したたるみ長さは、糸のたぐり機構
２４のネジ２８によつて調整することができる。第４図は糸の切断タイミング検出機構の説明図
である。指示片３０は、状を有して、その端部
を送り台３４と送り３５との接続部へ固定する。即ち、送り台３４は周知のように、図示しない
プーリーに接続された上軸３６の回転動作に応じ
て、送り３５を図示矢印の如く、移動させる。こ
の動作は、指示片３０を円運動させつつ、結果と
して上下動させる。この場合、針の最上位は、指
示片３０の最下位であることは機構上から明らか
であるため、ミシンの作業員は第１図に示される
ように、指示片３０の先端３１が指示位置３２
（指示片３０が最低位置になつた時、その先端３
１が指示位置３２に合うように、予め設定してあ
る。）へきた時、ソレノイドを付勢して糸を切れ
ば、状態が最も糸の切り易い位置であると同時
に、切つた後の糸の端部を適当の長さとでき、か
つ切断動作に応じて、糸のたぐりが出来、この結
果、次の縫い始めに所定の長さの糸を残すことが
出来る。第５図は本発明によつて縫つた場合の始端及び
終端の糸２２−１の突出状態図であり、本発明に
よれば長くも短くもない適当寸法を自動的に作り
出すことが出来ることを示している。なお、上記実施例では、糸の切断タイミングの
検出手段として、指示片の最下位置にて行なう旨
の説明をしたが、これに限定されるものではな
く、送り台の最下位置にて接点が入る構成とし、
電球の点灯によつて目視してもよいことは勿論で
ある。［発明の効果］以上説明した如く、本発明によれば針の最も上
つた状態にて糸を切断し、この切断動作に応じて
糸をたぐるようにしたので、縫い始め及び縫い終
り位置にて適当な長さの糸を残すことができ、縫
製作業の効率の向上が可能なまつり縫いミシンを
提供できる。 DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a blind stitch sewing machine, and particularly to a blind stitch sewing machine that takes into consideration thread end treatment at the beginning and end of sewing. (Prior Art) As is well known, a blind stitch is a type of overlock stitch used to sew folded parts such as the hem of pants, and is sewn using a blind stitch sewing machine. In order to automate the above-mentioned sewing machine, the applicant has already proposed Japanese Patent Application No. 185557/1983 (Japanese Patent Application Laid-Open No. 44286/1982), as shown in FIG. Figure 6 shows only the main parts of a blindstitch sewing machine, and its outline is as follows: sewing machine body 1 , needle storage device 2
The needle inside the needle is attached using the needle mounting device 3, the thread is passed through the needle hole using the threading means 4, and the link 6 is inserted by the thread cutting means (in FIG. 6, the solenoid 7 , 5, and finally to the fulcrum 8
The thread cutting means is actuated at the link 5 centering on the thread cutting means. ), and each of the above operations is semi-automated. Reference numeral 9 denotes a needle, which is attached to the needle swing arm 10 and reciprocates in a needle passage 13 provided in the needle base 12 from the bottom left side to the top right side like a pendulum of a clock. The looper 11 reciprocates on the presser foot holder 14 like a clock pendulum by the operation of an upper shaft (not shown), and blind stitching is performed due to the relationship between the needle 9 and the looper 11 described above. Note that thread cutting means 1 is provided inside the lower part of the support member 15.
6, and the end of the link 5 described above is configured to press a head 17 of a pressing rod, which will be described later. FIG. 7 is a view of only the thread cutting means when FIG. 6 is viewed from the direction of the arrow. As described above, the press rod 1 integrated with the head 17 is located inside the lower part of the support member 15.
8 is freely movably attached by a spring 19, and a blade portion 21 is provided at the tip of the blade portion 21, which is rotatable relative to a linear blade portion 20. The rotatable blade part 21 rotates in accordance with this forward movement, and the looper 11
The thread 22 in the supported state is cut by the thread 22. That is, each blade moves forward and enters the tip of the looper 11, and the thread 22 that has been hooked at this portion
cut. (Problems to be Solved by the Invention) In the above-described configuration, when the thread is cut, thread remains at the beginning and end of sewing, as shown in FIG. 8. Therefore, in order to finish the thread to a predetermined length, that is, to the extent that it extends slightly above the cloth, the remaining thread must be trimmed again, which poses the problem of increasing the number of man-hours. The above discussion has been made regarding sewn products, but there are also problems with threads left on sewing machine needles as follows. That is, a thread of a predetermined size remains in the needle hole and is inserted, and when sewing next time, the needle moves from the left bottom to the right inside the needle passage 13 provided in the needle rest 12 as explained in FIG. 6. Move towards the top. In this case, since a predetermined tensile force is applied to the thread by the thread tension plate (Fig. 6, 23), the thread comes out from the needle hole while the needle moves in the needle passage 13 and creates a thread loop. Teyuki,
When the needle is running low, the needle will come out of the fabric (a stitch will be created), and in the process of the needle coming out of the fabric, the thread will come out. Therefore, after the thread has been sewn several times in this state, the thread will come back and become ready for sewing, but the sewing machine has the drawback that sewing cannot be performed until then. The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a blind stitch sewing machine that automatically leaves a predetermined length of thread at the beginning and end of sewing, eliminating the need for trimming. It is said that [Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention transmits the energization of the solenoid to the thread cutting means via the link, and cuts the thread caught on the tip of the looper. In a blindstitch sewing machine having a configuration for cutting, a thread pulling mechanism provided to operate in conjunction with the link and a looper tip are positioned at 90 degrees with respect to a blade surface of a thread cutting means. It consists of a thread cutting timing detection mechanism that detects the thread cutting timing. (Function) Therefore, since the link is provided with a thread pulling mechanism, the thread can be pulled at the same time as the thread is cut.Furthermore, since the thread cutting timing detection mechanism is provided on the feed base, the timing can be checked. Can be visually observed. (Example) An example will be described below with reference to the drawings. FIG. 1 is a block diagram of an embodiment of a blind stitch sewing machine according to the present invention. In the blind stitch sewing machine according to the present invention,
Prior to the sewing process, a thread retrieval process is performed, and this retrieval process is performed at the same time as the thread cutting process, and
The timing for cutting the thread is when the looper is in its most upright position (the top of the needle). In other words, by focusing on the fact that the most upright position of the looper is the easiest to cut the thread, it detects this state and cuts the thread, and at the same time determines the required length of thread (for the next sewing). , the length that remains protruding above the first seam) is ensured. In FIG. 1, the same parts as in FIG. 6 are designated by the same reference numerals. In FIG. 1, reference numeral 24 denotes a thread pulling mechanism, in which a link 6 is inserted between two upright plates 25, 25, and a hole 2 is formed in each upright plate 25, 25 and the link 6.
6 and inserting the thread 22 through this hole,
I'm trying to pass it through the needle hole. The entire thread pulling mechanism 24 is formed integrally with the base plate 27, and its mounting position can be adjusted using screws 28. Reference numeral 29 denotes a yarn cutting timing detection mechanism, which determines the best timing for cutting when the tip 31 of the indicating piece 30 is above the indicated position 32. This matter will be detailed later. Next, the operation will be explained. In FIG. 1, the parts newly added in the present invention, that is, the thread pulling mechanism 24 and the thread cutting timing mechanism, do not have any influence on the original processing of the blind stitch sewing machine itself. . Therefore, the needle 9 fixed to the needle swing arm 10 reciprocates like a pendulum of a clock from the bottom left side to the top right side in the needle passage 13 provided in the needle base 12 in accordance with the reciprocating movement of the needle swing shaft (not shown). . On the other hand, the looper 11 also reciprocates on the presser foot receiver 14 in a clock pendulum shape in response to the above-mentioned operation, and blind stitching is performed. Note that the blind stitch itself will not be described in further detail since the structure and operation of the sewing machine are well known. As sewing proceeds sequentially in this state, the thread is drawn in sequence, as shown in FIG . The blind stitch is completed according to this movement. FIG. 2 is a top view of the thread pulling mechanism 24 , and the state of the thread 22 is shown by solid lines. FIG. 3 is a diagram for explaining the thread cutting timing, and this diagram is a schematic view seen from the direction of the arrow in FIG. 1. That is, FIG. 3 only shows the mutual positional relationship between the thread cutting means consisting of the blade parts 20 and 21, the needle 9 and the looper 11. It is assumed that the sewing operation described above is performed in sequence and a predetermined final point is reached. In this case, paying attention to the needle 9, it is obvious that the needle 9 is performing a reciprocating motion according to the solid line arrow with the thread 22 passed through the needle hole 33. That is, it is a reciprocating movement from position to position.
Note that when the needle is in position , the looper 11 is in the ' position and in its most upright state (the tip of the looper is almost in contact with the surface of the blades 20 and 21 of the thread cutting means).
As the needle 9 moves in the direction from this state, the looper 11 once retreats and further moves laterally in the direction along the arrow. During this horizontal movement, the looper 11, which had been in a standing position until now, gradually becomes a lying position,
The thread is scooped up at the point until it reaches the 'point', which is the most standing state. When this ' point is detected and the solenoid 7 is energized, the link 5 presses the head 17 of the thread cutting means in response to the suction operation of the link 6, moves the blade parts 20 and 21 forward, and the looper 11 The thread 22 is cut within the tip. Note that when the solenoid 7 is energized, the link 6 moves in the direction of the link 5, as shown in FIG. A dotted line-shaped sag (excessive tangled thread) is formed as shown in Figure 2. This yarn slack will be explained next. It has already been explained that the thread is cut at the looper' position in FIG. This position is the position where blind stitching is completed, and the thread can be cut at a predetermined length from the end. On the other hand, in this position, the needle is at its highest position.
Moreover, since the thread was cut at this position, although the thread was inserted into the needle hole, its length was the shortest. Therefore, the next blind stitch will be started in this state, but when the needle starts moving in the direction from this state, it will become slack without applying any tension, and the needle will reach its maximum elongation. In this state, that is, when the needle advances to the end of the needle rest 12, a loop is formed using the extra thread. By adjusting the length of this extra slack, it becomes possible to leave a predetermined length of thread at the beginning of blind stitching. Note that the slack length can be adjusted using the screw 28 of the thread pulling mechanism 24. FIG. 4 is an explanatory diagram of the thread cutting timing detection mechanism. The indicator piece 30 has a shape and its end is fixed to the connection between the feed base 34 and the feed 35. That is, as is well known, the feed table 34 moves the feed 35 in the direction of the illustrated arrow in response to the rotation of the upper shaft 36 connected to a pulley (not shown). This operation causes the indicator piece 30 to move circularly and as a result move up and down. In this case, it is clear from the mechanism that the highest point of the needle is the lowest point of the indicator piece 30, so the operator of the sewing machine must make sure that the tip 31 of the indicator piece 30 is at the indicated position as shown in FIG. 32
(When the indicator piece 30 reaches the lowest position, its tip 3
1 is set in advance so that it matches the indicated position 32. ), if you energize the solenoid and cut the thread, the position will be the position where it is easiest to cut the thread, and at the same time the end of the thread after cutting will be at an appropriate length, and the position will be adjusted according to the cutting operation. As a result, a predetermined length of thread can be left at the beginning of the next sewing. FIG. 5 is a diagram showing the protruding state of the thread 22-1 at the starting end and the end when sewing according to the present invention, and it is clear that according to the present invention, an appropriate size that is neither long nor short can be automatically created. It shows. In the above embodiment, it was explained that the yarn cutting timing is detected at the lowest position of the indicator piece. The configuration is such that
Of course, it may be visually observed by lighting a light bulb. [Effects of the Invention] As explained above, according to the present invention, the thread is cut when the needle is at its highest point, and the thread is pulled in accordance with this cutting operation, so that the thread is cut at the sewing start and sewing end positions. To provide a blind stitch sewing machine that can leave thread of an appropriate length and improve the efficiency of sewing work.

[Brief explanation of the drawing]

第１図は本発明によるまつり縫いミシンを説明
するための一実施例の構成図、第２図は糸のたぐ
り機構の説明図、第３図は糸の切断タイミングを
説明する概要図、第４図は糸の切断タイミング検
出機構図、第５図は本発明で縫つた場合の始端及
び終端の糸の突出状態図、第６図は既に提案済の
まつり縫いミシンの概要図、第７図は糸の切断状
態を示す図、第８図は従来のまつり縫いミシンで
縫つた場合の始点及び終点に残る糸の状態図であ
る。１……ミシン本体、２……針の収納装置、３…
…針の装着装置、４……糸通し手段、５，６……
リンク、７……ソレノイド、８……支点、９……
針、１０……針振腕、１１……ルーパー、１２…
…針台、１３……針通路、１４……押え受け、１
５……支持材、１６……糸切り手段、１７……頭
部、１８……押圧棒、１９……スプリング、２
０，２１……刃部、２２，２２−１……糸、２３
……糸調子皿、２４……糸のたぐり機構、２５…
…起立板、２６……穴、２７……基板、２８……
ネジ、２９……糸の切断タイミング検出機構、３
０……指示片、３１……先端、３２……指示位
置、３３……針穴、３４……送り台、３５……送
り、３６……上軸。 Fig. 1 is a configuration diagram of an embodiment of the blind stitch sewing machine according to the present invention, Fig. 2 is an explanatory diagram of the thread pulling mechanism, Fig. 3 is a schematic diagram illustrating the thread cutting timing, and Fig. 4 The figure is a diagram of the thread cutting timing detection mechanism, Figure 5 is a diagram of the protruding state of the thread at the beginning and end when sewing with the present invention, Figure 6 is a schematic diagram of a blind stitch sewing machine that has already been proposed, and Figure 7 is a diagram of the thread cutting timing detection mechanism. FIG. 8 is a diagram illustrating the state of thread cutting, and is a diagram showing the state of thread remaining at the start and end points when sewing with a conventional blind stitch sewing machine. 1 ... Sewing machine body, 2... Needle storage device, 3...
...Needle mounting device, 4... Threading means, 5, 6...
Link, 7... Solenoid, 8... Fulcrum, 9...
Needle, 10... Needle swing arm, 11... Looper, 12...
...needle rest, 13...needle passage, 14...presser foot holder, 1
5...Supporting material, 16 ...Thread cutting means, 17...Head, 18...Press rod, 19...Spring, 2
0,21...Blade part, 22,22-1...Thread, 23
...Thread tension disc, 24 ...Thread pulling mechanism, 25...
...Upright plate, 26...hole, 27...board, 28...
Screw, 29 ... Thread cutting timing detection mechanism, 3
0... Indication piece, 31... Tip, 32... Indication position, 33... Needle hole, 34... Feed base, 35... Feed, 36... Upper shaft.

Claims

[Scope of Claims] 1. In a blind stitch sewing machine configured to transmit the bias of a solenoid to a thread cutting means via a link to cut the thread caught on the crochet tip of a looper, the blind stitch sewing machine operates in conjunction with the link. The present invention is characterized by comprising a thread pulling mechanism provided as shown in FIG. Blind stitch sewing machine. 2. The blind stitch sewing machine according to claim 1, wherein the thread is cut when the indicator piece attached to the feed base reaches the lowest position. 3 Turn on the lamp at the lowest moving position of the feed base,
A blind stitch sewing machine according to claim 1, characterized in that the thread is cut at the timing.