JP3363499B2 - Thread cutting device - Google Patents
Thread cutting deviceInfo
- Publication number
- JP3363499B2 JP3363499B2 JP34323792A JP34323792A JP3363499B2 JP 3363499 B2 JP3363499 B2 JP 3363499B2 JP 34323792 A JP34323792 A JP 34323792A JP 34323792 A JP34323792 A JP 34323792A JP 3363499 B2 JP3363499 B2 JP 3363499B2
- Authority
- JP
- Japan
- Prior art keywords
- thread
- moving knife
- cloth
- bobbin
- lower thread
- 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.)
- Expired - Fee Related
Links
Landscapes
- Sewing Machines And Sewing (AREA)
Description
【発明の詳細な説明】
【０００１】
【産業上の利用分野】この発明は、針落ち位置とボビン
の下糸導出点との間に中釜剣先を配した半回転釜を有す
るミシンにおける糸切断装置に関するものである。
【０００２】
【従来の技術】ボビンの下糸導出点（ボビンケースの
角）と中釜剣先との間に針落ち位置がある半回転釜（以
下、ＤＢタイプの半回転釜という）を有するミシンは広
く使われており、その糸切断装置（図７（１））は、作
業者から見て動メス１の支点３が針落ち位置Ｏの右側前
方にあり、動メス１が手前で待機し、且つ、糸捌き時に
は動メス１が下糸、上糸の順に捌くものである。この糸
切断装置においては、釜の構成から必然的に決定される
切断すべき下糸、布側上糸が、図７（１）に示すよう
に、針落ち位置Ｏに対してほぼ一直線に並び、動メス１
の往動による下糸、布側上糸の各変位量を最小に抑える
ことが可能である。その糸切断は、図５に示すようにな
される。
【０００３】動メス１が（１）に示す待機状態から
（２）に示すように往動し、捌き（糸の切断に先立って
動メスの往動により、下糸及び布側上糸を動メスの糸手
繰り部へ導く動作）を開始する。上糸は釜に充分に引き
込まれており、動メスの捌き部先端が確実に進入するこ
とができる。そして、（３）の黒い矢印で示すように、
下糸が捌かれる。この下糸捌き量は、動メスの支軸から
捌き部先端までの距離と同支軸から捌き部終端までの距
離の差となって表れる。捌かれて屈曲した下糸には、下
糸自体の復元力とミシンの送りによる力以外には大きな
力が働かないが、捌き量が小さいので、下糸は十分に復
帰することができる。次いで（４）に示すように、布側
上糸が捌かれる。上糸は下糸に比べて、天秤の引上げや
釜の糸取り等の大きな挙動変化があり、布側上糸を図７
（１）の矢印方向に動かすことが必要であるが、この方
向と動メスの往動方向が一致しているので、最も少ない
捌き量を有効に与えることができる。（５）に示すよう
に、動メスが最後退し、捌かれた布側上糸が動メスの捌
き部外周を越え、糸手繰り部に進入する。（６）に示す
ように、動メス１が復動を開始し、布側上糸、下糸の順
に糸手繰り部に糸掛けがなされ、（７）に示すように、
上糸が天秤により引き上げられて動メスに巻き付くよう
にして保持される。そして下糸は、動メスに引出され、
必要量が繰り出される。このとき、下糸の引出し速度が
速過ぎてボビンが空転（余分な回転）し、次の縫い始め
に悪影響を及ぼすことがないように、動メス１の復動速
度が制御される。なお、動メス１に保持された部分の上
糸は、糸切断後の針側の残糸となる。最後に、（８）に
示すように、布側上糸、下糸の切断が行なわれる。切断
位置は針穴の直ぐ横であるので、布Ｆの裏に残る糸端は
短く、良い品質を確保することができる。そして、動メ
ス１を適宜の幅に設定し、大釜上ばね４の孔５の形状及
び糸の切断方向を以上のように定めることにより、次の
縫い出しに必要十分な針側の上糸端及び下糸端の各長さ
を確保することができる。
【０００４】ところで、ＤＢタイプの半回転釜を有する
ミシンにおいては、正送りする（左から右へ送る）とき
にはパーフェクトステッチが形成され、逆送りする（右
から左へ送る）ときにはヒッチステッチが形成され、自
動八方縫いには不向きである。一方、針落ち位置とボビ
ンの下糸導出点との間に中釜剣先を配した半回転釜（以
下、ＤＰタイプの半回転釜という）を備えたミシンも公
知であり（特許第９９３５３号公報参照）、正、逆両送
り時にパーフェクトステッチが形成され、八方縫い自動
ミシンに適しているが、今のところ普及しておらず、そ
の糸切断装置も開発されていない。
【０００５】そこで、このミシンに、ＤＢタイプの半回
転釜を有するミシンにおけると同様に、動メスによって
下糸を捌いた後に上糸を捌く糸切断装置を適用してみ
た。即ち、この糸切断装置は、図７（２）に示すよう
に、作業者から見て動メス１の支軸３が針落ち位置Ｏの
左側後方にあり、動メスが後方で待機し、且つ、糸捌き
時には動メス１が下糸、上糸の順に捌くものである。こ
の糸切断装置においては、釜の構成から必然的に決定さ
れる切断すべき下糸、布側上糸が、共に大釜上ばね４の
孔５の手前側にあり、ＤＢタイプの半回転釜を有するミ
シンにおけるように、針落ち位置Ｏに対して簡単には一
直線に並ぶ構成とすることができない。従って、動メス
１の往動による下糸、布側上糸の各変位量を最小に抑え
ることができない。その糸切断は、図６に示すようにな
される。
【０００６】動メス１が（１）に示す待機位置から
（２）、（３）に示すごとく往動し、先ず下糸から捌き
を入れる。次いで、（４）に示すように布側上糸を捌く
が、天秤の引上げや釜の糸取り等によって上糸の挙動が
大きく、布側上糸は図７（２）の矢印の範囲のどこに存
在するか定まらないので、布側上糸の変位量を大きくす
る必要がある。そのために下糸も大きく捌かれ、復帰力
の弱い、大きく捌かれた下糸は、（４）の※印に示すご
とく、撓みが元に戻れないまま残っている。（５）に示
す最後退状態では、釜の糸取りのモーションによって捌
かれた布側上糸は復帰するが、下糸は依然として撓んだ
ままである。次に（６）に示すように、動メス１が復動
を開始して布側上糸、下糸の順に糸手繰り部に糸掛けを
行なうが、下糸の復帰が不完全なことが多く、その場合
は、下糸の切断不良が発生する（ここでは糸掛けした状
態が示されている）。糸掛け後は、（７）に示すように
天秤による上糸引上げ、動メス１の復動による下糸繰り
出しが行なわれる。そして、（８）に示すように、動メ
ス１は各糸を手繰り、必要な長さを確保して糸切断を行
なうが、下糸の出る側の反対側で糸切断を行なっている
ので、ＤＢタイプの半回転釜を有するミシンの糸切断装
置に比べて、ボビンケース側の下糸の長さが動メスの幅
分長く残ることになる。
【０００７】
【発明が解決しようとする課題】ＤＰタイプの半回転釜
を有するミシンに下糸を捌いた後に上糸を捌く従来タイ
プの糸切断装置を適用した上記のものは、挙動の小さい
下糸を先に捌いてから挙動の大きい布側上糸を捌くまで
の距離が長く、動メス１の運動量を大きくする必要があ
り、下糸の捌き量が物理的に多くなるので、動メス１の
復動時に下糸を糸手繰り部に掛けることができず、下糸
切断不良が多発する。また、動メス１の支軸位置の関係
によって下糸の手繰り量が長くなる結果、糸切断後のボ
ビンケース側の下糸残糸長が長くなり、次の縫製開始時
に鳥の巣が発生し、縫い品質を低下させる。更に、下糸
に与える挙動が捌き、糸掛け、手繰の間大きく、ボビン
の空転（余分な回転）が大きいので、縫い品質を低下さ
せる。
【０００８】この発明は、針落ち位置とボビンの下糸導
出点との間に中釜剣先を配した半回転釜を有するミシン
における、切断不良を起こしたり、縫い品質を低下させ
ない糸切断装置を提供することを目的としている。
【０００９】
【課題を解決するための手段】上記目的を達成するため
に、この発明の糸切断装置は、針落ち位置とボビンケー
スの角との間に中釜剣先を配した半回転釜と、前記半回
転釜の大釜の上側に固定され、前記ボビンケースの角側
から見て、針側上糸を針落ち位置の後方に案内すると共
に布側上糸と下糸とを針落ち仕置の左右前方に分離して
案内する開口を有する大釜上ばねとを備えたミシンの糸
切断装置であって、往動時に前記大釜上ばねにより針落
ち位置の左右前方に案内された前記布側上糸と下糸とを
捌く糸捌き部と、復動時に前記糸捌き部により捌かれた
前記布側上糸と下糸とを手操って切断する糸手繰り部と
糸切断刃とを有する動メスと、前記動メスと協働して布
側上糸と下糸とを切断する固定メスとを備え、前記動メ
スは、前記ボビンケースの角側から見て針落ち位置の左
側後方に回動可能に軸支され、糸捌き時には、布側上
糸、下糸の順に糸捌きを行なうことを特徴とするもので
ある。
【００１０】
【作 用】上記のように構成された糸切断装置において
は、下糸より布側上糸が大きく捌かれ、下糸の挙動は小
さく、上糸も釜の糸取りによって、糸掛け位置に確実に
復帰し、動メスによる下糸、布側上糸の糸掛けが確実に
なされ、下糸、布側上糸の切断が確実になされる。ま
た、動メスの支軸の位置の関係によって下糸の手繰り量
が短くなる。
【００１１】
【実施例】図１ないし図４、図７（３）及び図８を参照
し、この発明の糸切断装置の実施例について説明する。
【００１２】この糸切断装置は、針落ち位置とボビンの
下糸導出点（ボビンケースの角１３）との間に中釜剣先
を配した半回転釜（ＤＰタイプの半回転釜：中釜が反時
計回りに回転する）を有するミシンに取り付けられ、作
業者（ボビンケースの角１３側）から見て支軸３が針落
ち位置Ｏの左側後方にあり、糸捌き部を手前に向けて待
機し、下糸より先に布側上糸を捌く動メス１と、動メス
１と共働して布側上糸及び下糸を切断する固定メス２と
より構成されており、上糸及び下糸は切断の際に、大釜
上ばね４の孔５によって制御される。
【００１３】動メス１は、従来のものと基本的には変わ
らず、図３に示す糸切りカム（数字は、後述する切断動
作における図４の順序番号に対応するものである）によ
って長さ方向の運動をする糸切り連結棒６、機枠に揺動
自在に支持された糸切り連結腕７、糸切りロッド８、機
枠に揺動自在に支持された糸切りレバーＬ９、それに一
体化された糸切りレバーＳ１０、動メスリンク１１を介
して反時計方向の回動（往動）及び時計方向の回動（復
動）を行なうことができる。即ち、後述するように、往
動時には、布側上糸が先に捌かれ、次に下糸が捌かれ
る。また、復動時には、下糸、布側上糸の糸掛け、糸切
断がなされる。
【００１４】動メス１の各部分の名称は、図２に示す通
り、１ａが糸捌き部、１ａ’が糸捌き部先端、１ｂが糸
手繰り部、１ｂ’が糸手繰り部先端あるいは糸捌き部終
端、１ｃが顎部、１ｄが糸切断刃（目玉と称する孔の前
縁に刃部が形成されている）、１ｅが支軸３が嵌合され
る孔、１ｆが動メスリンク１１の枢軸が嵌合される孔で
ある。
【００１５】固定メス２は、動メス１の上側に位置し、
先端の糸切断刃が針落ち位置の少し手前に位置してい
る。
【００１６】大釜上ばね４は、ＤＰタイプの半回転釜の
大釜１２の上側に固定され、その針落ち位置Ｏを中心と
した中心部に特殊形状をした糸制御用の孔５が形成され
ている。
【００１７】以上のような構成の糸切断装置における糸
切断動作は、図４に示すようになされる。なお、図４中
のＦは布で、１３はボビンケースの角（つの）である。
【００１８】動メス１が（１）に示す待機位置から
（２）、（３）、（４）に示すごとく往動し、上糸、下
糸の順に捌きを入れる。そして、（５）に示すように最
後退してから、（６）に示すごとく復動し、下糸、布側
上糸の順に糸掛けがなされ、（７）に示すごとく、更に
動メス１が復動して下糸が繰り出され、天秤の引上げに
より上糸が引上げられる。（８）に示すごとく、動メス
１が更に復動して布側上糸、下糸の切断がなされる。
【００１９】この発明の糸切断装置においては、図６に
示すものとは対照的に、下糸より布側上糸が大きく捌か
れるので、下糸に大きな挙動が与えられることはなく、
上糸も釜の糸取りによって、（６）に示すように、糸掛
け位置に確実に復帰するので、下糸、布側上糸の糸掛け
が確実になされ、糸切断不良を生じることはない。ま
た、糸切断に入る動メス１の方向が、図５に示すものと
同様であり、図８の実線で示すように、切断されてボビ
ンケースの角１３側に残る下糸の長さが、一点鎖線で示
す図６のものと比較してＬ2 −Ｌ1 だけ短くなってい
る。即ち、下糸を必要以上に繰り出さないので、ボビン
の空転も少なく、縫い品質の低下を防止することができ
る。
【００２０】
【発明の効果】この発明は、以上説明したように構成さ
れているので、以下に記載するような効果を奏する。
【００２１】即ち、ＤＰタイプの半回転釜を有するミシ
ンにおいて、縫い品質の低下や切断不良もなく、安定し
た切断性能を有する糸切断装置を得ることができる。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thread cutting device for a sewing machine having a half-turn hook having a middle hook blade point disposed between a needle drop position and a lower thread lead-out point of a bobbin. It concerns the device. 2. Description of the Related Art A bobbin lower thread lead-out point (of a bobbin case)
A sewing machine having a half-turn kettle (hereinafter, referred to as a DB-type half-turn hook) having a needle drop position between a corner) and a middle hook point is widely used, and its thread cutting device (FIG. 7 (1)) the fulcrum 3 of the moving knife 1 as viewed from the operator on the right side ahead of the needle drop position O, the moving knife 1 are available at the front, and the lower thread movable knife 1 during handling member, loosened in the order of upper thread Things. In this thread cutting device, the lower thread to be cut and the upper thread on the cloth side, which are inevitably determined from the configuration of the shuttle, are substantially aligned with the needle drop position O as shown in FIG. , Moving knife 1
It is possible to minimize the respective displacement amounts of the lower thread and the cloth-side upper thread due to the forward movement of. The thread cutting is performed as shown in FIG. The moving knife 1 moves forward from the standby state shown in (1) as shown in (2) and loosens (moves the lower thread and the cloth-side upper thread by the forward movement of the moving knife prior to cutting the thread). (Operation to guide the knives to the thread reeling portion). The upper thread is sufficiently drawn into the shuttle, so that the leading end of the moving section of the moving knife can reliably enter. And, as shown by the black arrow in (3),
The lower thread is loosened. The lower thread separation amount is expressed as a difference between the distance from the support shaft of the moving knife to the leading end of the separation portion and the distance from the support shaft to the end of the separation portion. A large force other than the restoring force of the lower thread itself and the force of the sewing machine feed does not act on the lower thread that has been separated and bent, but the lower thread can be sufficiently returned because the amount of separation is small. Next, as shown in (4), the cloth-side upper thread is separated. The upper thread has a large change in behavior, such as pulling up the balance and removing the thread from the shuttle, as compared with the lower thread.
Although it is necessary to move in the direction of the arrow (1), since this direction coincides with the forward movement direction of the moving knife, the smallest amount of loosening can be effectively given. As shown in (5), the moving knife retreats last, and the loosened cloth-side upper thread passes over the outer periphery of the loosening portion of the moving knife and enters the thread reeling portion. As shown in (6), the moving knife 1 starts to move backward, and the thread is threaded on the yarn handing portion in the order of the cloth side upper thread and the lower thread, and as shown in (7),
The upper thread is pulled up by the balance and held so as to be wound around the moving knife. And the lower thread is pulled out by a moving knife,
The required amount is paid out. At this time, the reciprocating speed of the moving knife 1 is controlled so that the bobbin does not spin out (excessive rotation) because the bobbin thread is pulled out too fast and does not adversely affect the next sewing start. The upper thread held by the moving knife 1 is a remaining thread on the needle side after thread cutting. Finally, as shown in (8), the upper thread and the lower thread on the cloth side are cut. Since the cutting position is right beside the needle hole, the yarn end remaining on the back of the cloth F is short, and good quality can be secured. Then, the moving knife 1 is set to an appropriate width, and the shape of the hole 5 of the cauldron upper spring 4 and the cutting direction of the thread are determined as described above. And each length of the lower thread end can be secured. By the way, in a sewing machine having a half-turn rotary hook of the DB type, perfect stitches are formed when feeding forward (feeding from left to right), and hitch stitches are formed when feeding backward (feeding from right to left). It is not suitable for automatic eight-way sewing. On the other hand, a sewing machine provided with a half-turn kettle (hereinafter, referred to as a DP-type half-turn hook) having an intermediate hook point disposed between a needle drop position and a bobbin lower thread take-out point is also known (Japanese Patent No. 99353). ), Perfect stitches are formed at the time of both forward and reverse feeding, and it is suitable for an eight-way sewing automatic sewing machine. However, it has not been widely used and its thread cutting device has not been developed. [0005] Therefore, as in the case of a sewing machine having a DB type half-turn hook, a thread cutting device that separates a lower thread with a moving knife and then separates an upper thread is applied to the sewing machine. That is, in this thread cutting device, as shown in FIG. 7 (2), when viewed from the operator, the support shaft 3 of the moving knife 1 is located on the left rear side of the needle drop position O, the moving knife stands by behind, and The moving knife 1 separates the lower thread and the upper thread in the order of thread separation. In this yarn cutting device, the lower thread and the cloth-side upper thread to be cut, which are inevitably determined from the configuration of the shuttle, are both on the front side of the hole 5 of the upper spring 4 of the cauldron. As in the case of a sewing machine having such a configuration, it is not possible to simply adopt a configuration in which the needle drop position O is aligned in a straight line. Therefore, it is not possible to minimize the respective displacement amounts of the lower thread and the cloth upper thread due to the forward movement of the moving knife 1. The thread cutting is performed as shown in FIG. [0006] The moving knife 1 moves forward from the standby position shown in (1) as shown in (2) and (3), and first, loosening is performed from the lower thread. Next, as shown in (4), the cloth-side upper thread is loosened, but the upper thread behaves largely due to pulling up of the balance, picking up of the shuttle, etc., and the cloth-side upper thread exists anywhere in the range of the arrow in FIG. 7 (2). It is not possible to determine whether to perform this operation, and it is necessary to increase the amount of displacement of the cloth-side upper thread. For this reason, the lower thread is also largely loosened, and the largely loosened lower thread having a weak restoring force remains unreturned as indicated by the mark * in (4). In the last retreat state shown in (5), the cloth-side upper thread that has been loosened by the thread take-up motion of the shuttle returns, but the lower thread is still bent. Next, as shown in (6), the moving knife 1 starts the backward movement, and the thread is threaded on the thread reeling portion in the order of the cloth side upper thread and the lower thread. However, the return of the lower thread is often incomplete. In this case, the lower thread is cut poorly (here, the thread is hooked). After the thread is hooked, the upper thread is pulled up by the balance and the lower thread is fed out by moving the moving knife 1 back as shown in (7). Then, as shown in (8), the moving knife 1 cuts each thread by hand and secures a necessary length to cut the thread. However, since the thread is cut on the side opposite to the side where the lower thread comes out, The bobbin case-side lower thread remains longer than the moving knife width compared to a sewing machine thread cutting device having a DB-type half-turn hook. [0007] A conventional type thread cutting device, in which a lower thread is separated from a sewing machine having a DP-type half-turning hook and then the upper thread is separated from the sewing machine, is used. Since the distance from the first separation of the thread to the separation of the cloth-side upper thread, which has a large behavior, is long and the momentum of the moving knife 1 needs to be increased, the amount of loosening the lower thread physically increases. When returning, the lower thread cannot be hooked on the thread reeling section, and lower thread cutting failure frequently occurs. Further, as a result of an increase in the amount of threading of the lower thread due to the relationship between the positions of the spindles of the moving knife 1, the length of the remaining lower thread of the bobbin case after thread cutting becomes longer, and a bird's nest occurs at the start of the next sewing. , Lowering the sewing quality. Further, the behavior given to the bobbin thread is large during loosening, threading, and threading, and the idling (excessive rotation) of the bobbin is large, thereby deteriorating the sewing quality. [0008] The present invention provides a thread cutting device that does not cause a cutting failure and does not lower the sewing quality in a sewing machine having a half-turn hook having a middle hook point disposed between a needle drop position and a lower thread lead-out point of a bobbin. It is intended to provide. In order to achieve the above object, a yarn cutting device according to the present invention comprises a needle drop position and a bobbin casing.
And a half-turn kettle with a middle hook sword point
It is fixed on the upper side of the cauldron of the turning bobbin,
From the needle side, the needle side upper thread is
The upper and lower threads on the cloth side
Sewing machine thread having a cauldron upper spring having an opening for guiding
A cutting device, wherein the needle falls by the upper hook of the cauldron during forward movement.
The cloth side upper thread and lower thread guided to the left and right front of the
The yarn is separated by the yarn separating unit and the yarn separating unit when returning.
A yarn hand-over unit that manually cuts the cloth-side upper thread and lower thread;
A moving knife having a thread cutting blade, and a cloth cooperating with the moving knife.
A fixed knife for cutting the upper thread and the lower thread;
Is located at the left of the needle drop position when viewed from the corner of the bobbin case.
The shaft is rotatably supported to the rear side, and the upper side is
It is characterized in that thread handling is performed in the order of thread and bobbin thread . In the yarn cutting device constructed as described above, the upper thread on the cloth side is loosened more than the lower thread, the behavior of the lower thread is smaller, and the upper thread is also threaded at the yarn hooking position by the thread pick-up of the shuttle. The lower thread and the cloth-side upper thread are securely hooked by the moving knife, and the lower thread and the cloth-side upper thread are reliably cut. Further, the amount of manual threading of the bobbin thread becomes shorter depending on the position of the support shaft of the moving knife. Referring to FIGS. 1 to 4, FIG. 7 (3) and FIG. 8, an embodiment of a yarn cutting apparatus according to the present invention will be described. This thread cutting device has a half-rotation hook (DP type half-rotation hook: middle hook ) in which an intermediate hook blade point is arranged between the needle drop position and the lower thread lead-out point (bobbin case corner 13) of the bobbin. (Rotating counterclockwise)), the support shaft 3 is located on the left rear side of the needle drop position O when viewed from the operator (the corner 13 side of the bobbin case) , and the thread handling unit stands by toward the front. A moving knife 1 for loosening the cloth upper thread prior to the lower thread, and a fixed knife 2 for cutting the cloth upper thread and lower thread in cooperation with the moving knife 1. The yarn is controlled by the hole 5 of the cauldron upper spring 4 during cutting. The moving knife 1 is basically the same as the conventional knife, and is lengthened by a thread cutting cam shown in FIG. 3 (the numerals correspond to the sequence numbers in FIG. 4 in the cutting operation described later). Threading connection rod 6 that moves in the direction, threading connection arm 7 swingably supported by the machine frame, thread cutting rod 8, threading lever L9 swingably supported by the machine frame, and integrated therewith Rotation in the counterclockwise direction (forward movement) and rotation in the clockwise direction (backward movement) can be performed via the thread trimming lever S10 and the moving knife link 11 thus set. That is, as described later, at the time of forward movement, the cloth-side upper thread is separated first, and then the lower thread is separated. At the time of the backward movement, the lower thread and the cloth-side upper thread are hooked and cut. As shown in FIG. 2, the names of the respective parts of the moving knife 1 are as follows: 1a is a thread separating section, 1a 'is a thread separating section tip, 1b is a thread threading section, 1b' is a thread threading section tip or a thread separating section. The end, 1c is a jaw, 1d is a thread cutting blade (a blade is formed at the front edge of a hole called an eyeball), 1e is a hole into which the support shaft 3 is fitted, and 1f is a pivot of the moving knife link 11. Is a hole to be fitted. The fixed knife 2 is located above the moving knife 1,
The thread cutting blade at the tip is located slightly before the needle drop position. The cauldron upper spring 4 is fixed on the upper side of the cauldron 12 of the DP type half-turning cauldron. A specially shaped thread control hole 5 is formed at the center of the needle dropping position O. I have. The yarn cutting operation of the yarn cutting device having the above configuration is performed as shown in FIG. In addition, F in FIG. 4 is cloth, and 13 is a corner of the bobbin case. The moving knife 1 moves forward from the standby position shown in (1) as shown in (2), (3) and (4), and loosens the upper thread and the lower thread in this order. Then, after retreating as shown in (5), it moves backward as shown in (6), and the thread is hooked in the order of the lower thread and the cloth-side upper thread. As shown in (7), the moving knife 1 is further moved. Moves back and the lower thread is fed out, and the upper thread is pulled up by pulling up the balance. As shown in (8), the moving knife 1 is further moved back, and the cloth-side upper thread and lower thread are cut. In the yarn cutting device according to the present invention, in contrast to the one shown in FIG. 6, the upper yarn on the cloth side is handled more heavily than the lower yarn.
As shown in (6), the upper thread is also securely returned to the thread hooking position by thread pick-up by the shuttle, so that the lower thread and the cloth-side upper thread are hooked securely, and no yarn cutting failure occurs. The direction of the moving knife 1 entering the thread cutting is the same as that shown in FIG. 5, and as shown by the solid line in FIG. 8, the length of the lower thread that is cut and remains on the corner 13 side of the bobbin case is: It is shorter by L 2 -L 1 as compared with the one shown in FIG. That is, since the bobbin is not unnecessarily fed out, bobbin idling is reduced, and a decrease in sewing quality can be prevented. Since the present invention is configured as described above, it has the following effects. That is, in a sewing machine having a DP type half-turn hook, a thread cutting device having stable cutting performance without lowering of sewing quality or defective cutting can be obtained.
【図面の簡単な説明】
【図１】この発明の糸切断装置の平面図である。
【図２】この発明の糸切断装置に用いられる動メスの平
面図である。
【図３】この発明の糸切断装置に用いられる糸切りカム
の転開図である。
【図４】ＤＰタイプの半回転釜を有するミシンにおい
て、布側上糸、下糸の順に捌いて糸を切断する場合の動
作を説明する斜視図である。
【図５】ＤＢタイプの半回転釜を有するミシンにおける
糸切断動作を説明する斜視図である。
【図６】ＤＰタイプの半回転釜を有するミシンにおい
て、下糸、布側上糸の順に捌いて糸を切断する場合の動
作を説明する斜視図である。
【図７】（１）、（２）、（３）はそれぞれ図５、図
６、図４の各糸切断動作における動メスの軌跡を説明す
る図である。
【図８】ＤＰタイプの半回転釜を有するミシンにおけ
る、布側上糸、下糸の順に捌く場合と、下糸、布側上糸
の順に捌く場合のボビンケース側下糸の長さの違いを説
明する図である。
【符号の説明】
１ 動メス
１ａ 動メスの糸捌き部
２ 固定メス
３ 動メスの支軸
４ 大釜上ばね
５ 大釜上ばねの孔
Ｏ 針落ち位置BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of a yarn cutting device according to the present invention. FIG. 2 is a plan view of a moving knife used in the yarn cutting device of the present invention. FIG. 3 is a roll-up view of a thread cutting cam used in the thread cutting device of the present invention. FIG. 4 is a perspective view for explaining an operation in a case where a sewing machine having a DP type half-rotary shuttle and cutting a yarn by separating a fabric side upper thread and a lower thread in this order. FIG. 5 is a perspective view illustrating a thread cutting operation of a sewing machine having a DB type half-turn shuttle. FIG. 6 is a perspective view for explaining an operation in a case where the lower thread and the cloth-side upper thread are separated in this order in the sewing machine having the DP type half-turn shuttle to cut the thread. FIGS. 7 (1), (2), and (3) are diagrams illustrating the locus of the moving knife in each of the thread cutting operations of FIGS. 5, 6, and 4, respectively. FIG. 8 shows the difference in the length of the bobbin case-side lower thread between the case where the fabric side upper thread and the lower thread are separated in this order and the case where the lower thread and the fabric side upper thread are separated in the sewing machine having the DP type half-turn shuttle. FIG. [Description of Signs] 1 Moving knife 1a Thread separating portion of moving knife 2 Fixed knife 3 Spindle of moving knife 4 Cauldron upper spring 5 Hole of cauldron upper spring O Needle drop position
フロントページの続き (56)参考文献 特開 平３−111084（ＪＰ，Ａ) 特開 昭48−93451（ＪＰ，Ａ) 特開 昭52−34846（ＪＰ，Ａ) 特開 昭60−210290（ＪＰ，Ａ) 特開 昭62−53700（ＪＰ，Ａ) 特開 昭56−106692（ＪＰ，Ａ) 特開 昭61−100294（ＪＰ，Ａ) 特開 平４−65569（ＪＰ，Ａ) 実開 平２−106183（ＪＰ，Ｕ) 実用新案登録2605394（ＪＰ，Ｙ２) 特公 昭57−53753（ＪＰ，Ｂ２) 特許99353（ＪＰ，Ｃ２) (58)調査した分野(Int.Cl.7，ＤＢ名) D05B 65/02 D05B 57/12 Continuation of front page (56) References JP-A-3-111108 (JP, A) JP-A-48-93451 (JP, A) JP-A-52-34846 (JP, A) JP-A-60-210290 (JP, A) JP-A-62-53700 (JP, A) JP-A-56-100692 (JP, A) JP-A-61-100294 (JP, A) JP-A-4-65569 (JP, A) 2-106183 (JP, U) Utility model registration 2605394 (JP, Y2) Japanese Patent Publication No. 57-53753 (JP, B2) Patent 99353 (JP, C2) (58) Fields investigated (Int. Cl. 7 , DB name) ) D05B 65/02 D05B 57/12
Claims (1)
釜剣先を配した半回転釜と、前記半回転釜の大釜の上側
に固定され、前記ボビンケースの角側から見て、針側上
糸を針落ち位置の後方に案内すると共に布側上糸と下糸
とを針落ち仕置の左右前方に分離して案内する開口を有
する大釜上ばねとを備えたミシンの糸切断装置であっ
て、往動時に前記大釜上ばねにより針落ち位置の左右前
方に案内された前記布側上糸と下糸とを捌く糸捌き部
と、復動時に前記糸捌き部により捌かれた前記布側上糸
と下糸とを手操って切断する糸手繰り部と糸切断刃とを
有する動メスと、前記動メスと協働して布側上糸と下糸
とを切断する固定メスとを備え、前記動メスは、前記ボ
ビンケースの角側から見て針落ち位置の左側後方に回動
可能に軸支され、糸捌き時には、布側上糸、下糸の順に
糸捌きを行なうことを特徴とするミシンの糸切断装置。(57) [Claims] [Claim 1] The middle between the needle drop position and the corner of the bobbin case.
A half-turn kettle with a kettle point and the upper part of the cauldron of the half-turn kettle
At the needle side when viewed from the corner side of the bobbin case.
Guides the yarn to the rear of the needle drop position and the upper and lower yarns on the cloth side.
And an opening to separate and guide the left and right front of the needle drop device.
Sewing machine with a cauldron upper spring
During forward movement, the cauldron upper spring moves left and right before the needle drop position.
Yarn handling section for handling the cloth side upper thread and lower thread guided in the direction
And the cloth side upper thread loosened by the yarn loosening section during the backward movement
And a thread cutting blade that manually cuts the bobbin thread and the bobbin thread.
A moving knife having a cloth side upper thread and a lower thread in cooperation with the moving knife
And a fixed knife for cutting the moving knife.
Rotates to the left rear of the needle drop position when viewed from the corner of the bin case
It is supported as possible, and at the time of thread handling, the upper thread on the cloth side and the lower thread
A thread cutting device for a sewing machine, which performs thread handling .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34323792A JP3363499B2 (en) | 1992-11-30 | 1992-11-30 | Thread cutting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34323792A JP3363499B2 (en) | 1992-11-30 | 1992-11-30 | Thread cutting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06165891A JPH06165891A (en) | 1994-06-14 |
| JP3363499B2 true JP3363499B2 (en) | 2003-01-08 |
Family
ID=18359985
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34323792A Expired - Fee Related JP3363499B2 (en) | 1992-11-30 | 1992-11-30 | Thread cutting device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3363499B2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2605394Y2 (en) | 1992-11-30 | 2000-07-10 | ジューキ株式会社 | Cauldron upper spring |
| JP5753753B2 (en) | 2011-09-30 | 2015-07-22 | 日立コンシューマエレクトロニクス株式会社 | Information reproducing apparatus and information reproducing method |
-
1992
- 1992-11-30 JP JP34323792A patent/JP3363499B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2605394Y2 (en) | 1992-11-30 | 2000-07-10 | ジューキ株式会社 | Cauldron upper spring |
| JP5753753B2 (en) | 2011-09-30 | 2015-07-22 | 日立コンシューマエレクトロニクス株式会社 | Information reproducing apparatus and information reproducing method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06165891A (en) | 1994-06-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5016829A (en) | Takeup machine | |
| JP2912374B2 (en) | Thread trimmer for zigzag sewing machine | |
| DE19650933A1 (en) | Winding unit of a textile machine producing cross-wound bobbins | |
| JPH0768071A (en) | Automatic lower thread feeder | |
| JP3363499B2 (en) | Thread cutting device | |
| JP4799752B2 (en) | Hole sewing machine | |
| JPH0244744B2 (en) | ||
| DE1485306A1 (en) | Lockstitch sewing machine | |
| JP2605394Y2 (en) | Cauldron upper spring | |
| JP2000327228A (en) | Threading device for winding machine | |
| JP3792779B2 (en) | Upper thread changing device of sewing machine | |
| JPH02213385A (en) | Thread-cutting device for sewing machine | |
| JP2733791B2 (en) | Yarn winding device | |
| JPH11333175A (en) | Thread cutting device of sewing machine | |
| JP3211766B2 (en) | Spinning winder | |
| JPS6037409Y2 (en) | Auxiliary cutter device in thread winding machine | |
| JP2584981Y2 (en) | Sewing machine thread trimmer | |
| JP2583394B2 (en) | Thread trimmer for horizontal hook sewing machine | |
| JP3394059B2 (en) | Thread cutting device in automatic sewing machine | |
| US4799440A (en) | Looper changeover device | |
| JPH0747102Y2 (en) | Sewing machine thread trimmer | |
| JPS5818861Y2 (en) | Sewing machine thread cutting device | |
| JPH0741735Y2 (en) | Separate winding detection device | |
| SU981167A1 (en) | Apparatus for securing material on winding machine core | |
| EP0066410A1 (en) | Thread cutting device for sewing machine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| S533 | Written request for registration of change of name |
Free format text: JAPANESE INTERMEDIATE CODE: R313533 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20071025 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20081025 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20091025 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20091025 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20101025 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20111025 Year of fee payment: 9 |
|
| LAPS | Cancellation because of no payment of annual fees |