JP5089120B2 - Full rotary hook of sewing machine - Google Patents
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- JP5089120B2 JP5089120B2 JP2006265039A JP2006265039A JP5089120B2 JP 5089120 B2 JP5089120 B2 JP 5089120B2 JP 2006265039 A JP2006265039 A JP 2006265039A JP 2006265039 A JP2006265039 A JP 2006265039A JP 5089120 B2 JP5089120 B2 JP 5089120B2
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Description
本発明は、外釜に相対回転自在に装着された中釜の下糸案内部に形成された係止壁部の周方向幅が中釜の回転中心側から中釜の径方向外側へ向かってリニアに減少するように形成され、係止壁部をこれに係合した釜止め部材で左右方向に移動させて中釜を時計回りと反時計回りに回動できるようにしたミシンの全回転釜に関する。 In the present invention, the circumferential width of the locking wall portion formed in the lower thread guide portion of the inner hook mounted on the outer hook so as to be relatively rotatable is from the rotation center side of the inner hook toward the radially outer side of the inner hook. Full-rotation hook of the sewing machine formed so as to decrease linearly, and the inner wall can be turned clockwise and counterclockwise by moving the locking wall portion in the left-right direction with the hook stopper member engaged with the hook. About.
従来、工業用ミシンには、半回転釜が使用される場合もあるが、一般的には、釜駆動機構が簡単な垂直全回転釜を使用する場合が多い。この垂直全回転釜として、DP型の高速千鳥縫い用の全回転釜を使用する場合がある。この種の垂直全回転釜は、下軸により回転される外釜と、この外釜に相対回転自在に装着された中釜と、この中釜に着脱可能に装着されたボビンケースとを有し、中釜は釜止め部材で回転しないようになっている。しかも、この釜止め部材を駆動機構により左右方向に移動させて、同時に中釜を時計回り又は反時計回りに回動させることにより、ヒッチステッチを防止するようにしたミシンが各種提案されている。 Conventionally, a half-rotary shuttle may be used for an industrial sewing machine, but in general, a vertical full-rotary shuttle with a simple shuttle drive mechanism is often used. As this vertical full rotary hook, a DP type full rotary hook for high-speed zigzag stitching may be used. This type of vertical full rotary hook has an outer hook that is rotated by a lower shaft, an inner hook that is relatively rotatably attached to the outer hook, and a bobbin case that is detachably attached to the inner hook. The inner hook is prevented from rotating by the hook retaining member. In addition, various sewing machines have been proposed in which the hook stopper is moved in the left-right direction by a drive mechanism, and at the same time the inner hook is rotated clockwise or counterclockwise to prevent hitch stitches.
例えば、特許文献1に記載のサイクルミシンの縫目形成機構は、ボビンケースから上方に突出した角部を左右方向向きの移動体の係止部に係合させ、送り方向によって、縫目がヒッチステッチとパーフェクトステッチの何れになるのか不安定な状態の送りの場合には、送りカムを回転させ、回動レバーと移動体を介して角部を、左側傾斜又は右側傾斜に切換えて、ボビンケースの下糸出口を縫針の左側又は右側に傾けることにより、パーフェクトステッチを形成するようにしてある。 For example, in the stitch formation mechanism of a cycle sewing machine described in Patent Document 1, a corner protruding upward from a bobbin case is engaged with a locking portion of a moving body facing in the left-right direction, and the stitches are hitch depending on the feed direction. In the case of feeding in an unstable state, whether the stitch or perfect stitch, the feed cam is rotated and the corner is switched to the left side or right side via the rotating lever and moving body, and the bobbin case A perfect stitch is formed by tilting the lower thread exit to the left or right side of the sewing needle.
ところで、特許文献1に記載のサイクルミシンの縫目形成機構は、大きな移動体及び送りカムを設けており、下糸出口の切換え機構が大型化することから、最近では、二股状で小型の釜止め部材を用いた切換え機構が実用化されている。例えば、特許文献2に記載のミシンの垂直回転釜は、外釜と、この外釜に装着された内釜と、この内釜に不図示のボビンを回転可能に保持するように嵌挿されたボビンケースとからなり、内釜はミシンのベッドフレームに前端部が固定された板状の内釜止めの後端部で回転しないように支持されている。 By the way, since the stitch formation mechanism of the cycle sewing machine described in Patent Document 1 is provided with a large moving body and a feed cam, and the switching mechanism of the lower thread outlet is enlarged, recently, a bifurcated and small shuttle A switching mechanism using a stop member has been put into practical use. For example, a vertical rotary hook of a sewing machine described in Patent Document 2 is inserted so as to rotatably hold an outer hook, an inner hook mounted on the outer hook, and a bobbin (not shown) in the inner hook. It consists of a bobbin case, and the inner hook is supported so as not to rotate at the rear end of a plate-like inner hook stopper whose front end is fixed to the bed frame of the sewing machine.
この垂直回転釜101に設けられた内釜止め107の後端部は、図12に示すように、一般的に、平面視にて所謂二股状であり、この二股部に左右1対の係合部107a,107bが形成されている。この係合部107a,107bで内釜103の下糸案内部103aに形成された縦向きの係止壁部103cを外釜回転方向の両側から当接するようにして、縫製中においても、内釜103の外釜102に対する相対位置を保持するようにしている。 As shown in FIG. 12, the rear end portion of the inner hook stopper 107 provided in the vertical rotary hook 101 is generally a so-called bifurcated shape in a plan view. Portions 107a and 107b are formed. Even when the inner hook is being sewn, the engaging portions 107a and 107b abut the vertical locking walls 103c formed on the lower thread guide portion 103a of the inner hook 103 from both sides in the outer hook rotating direction. The relative position of 103 to the outer hook 102 is maintained.
この場合、外釜102は縫製時に図12において矢印で示す時計回りに高速回転するため、左右1対の係合部107a,107bのうちの右側係合部107bは外釜102の回転力を受けるので、左側係合部107aよりも大きく且つ頑丈に形成されている。しかも、中釜103の係止壁部103cの周方向幅は、一般的に内周側から外周側へ向かって拡大するように形成されている。 In this case, since the outer hook 102 rotates at high speed clockwise as indicated by an arrow in FIG. 12 during sewing, the right engaging portion 107b of the pair of left and right engaging portions 107a and 107b receives the rotational force of the outer hook 102. Therefore, it is larger and more robust than the left engaging portion 107a. Moreover, the circumferential width of the locking wall 103c of the inner hook 103 is generally formed so as to increase from the inner peripheral side toward the outer peripheral side.
縫製中に、作業者は、この内釜止め107を適宜手動操作で左方又は右方に移動させたり、ソレノイドアクチュエータにより電気的に切換えるようになっている。それ故、送り方向に応じてこのように、内釜止め107を左右に移動させることにより、中釜103が反時計回りに可動したり、図13に示すように時計回りに回動し、ヒッチステッチを回避するようにしている。
図12に示すように、釜止め107を左方に移動して中釜103を反時計回りに回動させる場合、左側係合部107aは小型であるため、中釜103は回転軸心に対して反時計回りに大きく回動させることができ、この場合のヒッチステッチを回避することができる。しかし、図13に示すように、釜止め107を右方に移動して中釜103を回転軸心に対して時計回りに回動させる場合、右側係合部107bは大型であり、係止壁部103cの周方向幅は、内周側から外周側へ向かって拡大するように形成されている。それ故、右側係合部107aと係止壁部103cとが干渉するようになり、中釜103を時計回りに少しだけしか回動させることができず、この場合におけるヒッチステッチを確実に防止することができないという問題がある。 As shown in FIG. 12, when the hook stopper 107 is moved to the left and the inner hook 103 is rotated counterclockwise, the left hook 107a is small, so that the inner hook 103 is positioned relative to the rotational axis. Therefore, the hitch stitch can be avoided in this case. However, as shown in FIG. 13, when the hook stopper 107 is moved to the right and the inner hook 103 is rotated clockwise with respect to the rotation axis, the right engagement portion 107b is large and the locking wall The circumferential width of the portion 103c is formed so as to increase from the inner peripheral side toward the outer peripheral side. Therefore, the right engagement portion 107a and the locking wall portion 103c interfere with each other, and the inner hook 103 can be rotated only slightly in the clockwise direction, thereby reliably preventing hitch stitching in this case. There is a problem that can not be.
そこで、このヒッチステッチを極力回避できるように、釜止め107をできるだけ大きく右方へ移動させた場合には、右側係合部107bと係止壁部103cとの間の隙間が殆どなくなり、天秤による糸引き締めに時に、外釜102と中釜103の間を挿通した上糸が右側係合部107bと係止壁部103cの間を通過する際の糸抜けが悪くなり、結果的に、糸締まりが悪くなるという問題がある。 Therefore, when the hook stopper 107 is moved to the right as much as possible so as to avoid this hitch stitch as much as possible, there is almost no gap between the right engaging portion 107b and the locking wall portion 103c, and the balance When thread tightening, the upper thread that has passed between the outer hook 102 and the inner hook 103 passes between the right engaging portion 107b and the locking wall portion 103c, resulting in poor thread pulling. There is a problem of getting worse.
本発明の目的は、中釜を回転軸心に対して反時計回りと同様に時計回りにも大きく回動できるようにすること、中釜を時計回りに回動させたときでも、上糸の糸引き締めを良好にできるようにすることである。 The object of the present invention is to enable the inner hook to be rotated clockwise as well as counterclockwise with respect to the rotation axis, and even when the inner hook is rotated clockwise, It is to be able to satisfactorily tighten the thread.
請求項1のミシンの全回転釜は、ミシンの針板の下側で縫針の上下動と調時して下軸と一体回転する外釜と、この外釜に相対回転自在に装着された中釜と、前記針板に取り付けられ中釜が回転しないように拘束する釜止め部材と、中釜に着脱可能に装着されたボビンケースとを有するミシンの全回転釜において、中釜は下糸案内部と、この下糸案内部に形成された係止穴部と、下糸案内部のうちの係止穴部よりも外釜回転方向前進側の係止壁部有し、前記係止壁部に下糸通過穴が形成されると共に前記係止壁部の上端部の下軸側後面に後方へ膨らませた膨出部が形成され、釜止め部材は、係止壁部に外釜回転方向の両側から当接可能な1対の係合部を有する二股部を有すると共に水平方向位置を調節可能に構成され、前記係止壁部の周方向幅が中釜の回転中心側から中釜の径方向外側へ向かってリニアに減少するように形成されると共に、前記二股部の1対の係合部は同様の形状に形成されたことを特徴としている。 A fully rotating hook of the sewing machine according to claim 1 is provided with an outer hook that rotates in unison with the lower shaft in synchronism with the vertical movement of the sewing needle below the needle plate of the sewing machine, In a full-rotation hook of a sewing machine having a hook, a hook stopper member that is attached to the needle plate and restrains the inner hook from rotating, and a bobbin case that is detachably attached to the inner hook, the inner hook is a lower thread guide. And a locking hole formed on the lower thread guide, and a locking wall on the further side of the outer hook rotation direction than the locking hole of the lower thread guide, the locking wall A lower thread passing hole is formed in the lower wall side rear surface of the upper end portion of the locking wall portion, and a bulging portion bulging backward is formed on the locking wall portion. adjustably configured to horizontal position while have a bifurcated portion having an engagement portion of the pair capable of contacting from both sides, the circumferential width of the engaging wall portion It is formed so as to decrease linearly from the rotation center side of the inner hook toward the outer side in the radial direction of the inner hook, and the pair of engaging portions of the forked portion are formed in the same shape. .
釜止め部材は、係止壁部に外釜回転方向の両側から当接可能な1対の係合部を有する二股部を有する共とに水平方向位置を調節可能に構成され、前記係止壁部の周方向幅が中釜の回転中心側から中釜の径方向外側へ向かってリニアに減少するように形成されると共に、前記二股部の1対の係合部は同様の形状に形成されている。それ故、釜止め部材を左右方向に移動させる際に、中釜と一体的に回転移動する係止壁部と釜止め部材の二股部とが何ら干渉することがなく、中釜は反時計回りと同様に時計回りにも大きく回動する。 The hook stop member is configured to be able to adjust the horizontal position together with the bifurcated portion having a pair of engaging portions that can come into contact with the locking wall portion from both sides in the outer hook rotation direction. And the pair of engaging portions of the bifurcated portion are formed in a similar shape.The circumferential width of the portion is linearly reduced from the rotation center side of the inner hook toward the radially outer side of the inner hook. ing. Therefore, when the hook stopper member is moved in the left-right direction, there is no interference between the locking wall portion that rotates integrally with the inner hook portion and the bifurcated portion of the hook stopper member, and the inner hook portion rotates counterclockwise. As with, it also turns clockwise.
請求項2のミシンの全回転釜は、請求項1において、釜止め部材を左右方向へ所定ストローク移動駆動可能な駆動手段を設け、駆動手段で釜止め部材を移動駆動することで、下糸通過穴を縫針の上下動軌跡の延長線に対して左側に位置する左側位置と右側に位置する右側位置とに択一的に切換え可能に構成したものである。 Full rotary hook of a sewing machine according to claim 2, Oite to claim 1, provided with a predetermined stroke movement drivable drive means hook stopper member in the lateral direction, the hook stopper member by moving driven by the driving means, under The thread passage hole is configured to be selectively switchable between a left side position positioned on the left side and a right side position positioned on the right side with respect to the extension line of the vertical movement locus of the sewing needle.
請求項1の発明によれば、外釜と中釜と釜止め部材とボビンケースとを有するミシンの全回転釜において、中釜は、下糸案内部と、この下糸案内部に形成された係止穴部と、係止壁部を有し、前記係止壁部に下糸通過穴が形成されると共に前記係止壁部の上端部の下軸側後面に後方へ膨らませた膨出部が形成され、釜止め部材は、係止壁部に外釜回転方向の両側から当接可能な1対の係合部を有する二股部を有すると共に水平方向位置を調節可能構成され、前記係止壁部の周方向幅が中釜の回転中心側から中釜の径方向外側へ向かってリニアに減少するように形成されると共に、前記二股部の1対の係合部は同様の形状に形成されている。
それ故、釜止め部材の二股部を介して係止壁部を左右方向(水平方向)に移動させる際に、この二股部と、これに当接している中釜の係止壁部とが何ら干渉することがない。それ故、中釜は反時計回りと同様に時計回りにも大きく回動することができ、この場合におけるヒッチステッチを確実に回避することができる。
According to the first aspect of the present invention, in the full rotary hook of the sewing machine having the outer hook, the inner hook, the hook stopper member, and the bobbin case, the inner hook is formed in the lower thread guide portion and the lower thread guide portion. A bulging portion having a locking hole portion and a locking wall portion, in which a lower thread passage hole is formed in the locking wall portion, and is bulged rearward on the lower shaft side rear surface of the upper end portion of the locking wall portion The hook stopper member has a bifurcated portion having a pair of engaging portions that can be brought into contact with the locking wall portion from both sides in the outer hook rotation direction, and is capable of adjusting the horizontal position. The circumferential width of the wall portion is formed so as to decrease linearly from the rotation center side of the inner hook toward the outer side in the radial direction of the inner hook, and the pair of engaging portions of the bifurcated portion are formed in the same shape. Has been.
Therefore, when the locking wall portion is moved in the left-right direction (horizontal direction) via the bifurcated portion of the hook stopper member, the bifurcated portion and the locking wall portion of the inner hook that is in contact with the bifurcated portion are not. There is no interference. Therefore, the inner hook can be greatly rotated clockwise as well as counterclockwise, and hitch stitches in this case can be reliably avoided.
そして、前記係止壁部の周方向幅が中釜の回転中心側から中釜の径方向外側へ向かってリニアに減少するように形成されたので、釜止め部材が左右方向へ移動する移動距離に応じて、中釜の回動角度を係止壁部を介して比例的に変化させることができる。その他請求項1と同様の効果を奏する。 And since the circumferential width of the locking wall portion is linearly decreased from the rotation center side of the inner hook toward the radially outer side of the inner hook, the movement distance by which the hook stopper moves in the left-right direction. Accordingly, the rotation angle of the inner hook can be changed proportionally through the locking wall portion. Other effects similar to those of the first aspect are obtained.
請求項2の発明によれば、釜止め部材を左右方向へ所定ストローク移動駆動可能な駆動手段を設け、駆動手段で釜止め部材を移動駆動することで、下糸通過穴を縫針の上下動軌跡の延長線に対して左側に位置する左側位置と右側に位置する右側位置とに択一的に切換え可能に構成したので、布送り方向によって、ヒッチステッチが発生しないように、駆動機構を駆動して釜止め部材を左右方向に移動駆動させ、下糸通過穴を左側位置と右側位置とに適宜切換えることができる。 According to the invention of claim 2, provided with a predetermined stroke movement drivable drive means hook stopper member in the lateral direction, the hook stopper member by moving driven by driving means, vertical movement locus of the sewing needle and lower thread passing hole Since it can be switched selectively between the left position on the left side and the right position on the right side of the extension line, the drive mechanism is driven so that hitch stitches do not occur depending on the cloth feed direction. Thus, the hook stopper can be moved in the left-right direction, and the lower thread passage hole can be appropriately switched between the left position and the right position.
即ち、布送り方向によって縫針の目孔から延びる上糸が縫針の右側に絡むときには、駆動手段により釜止め部材を右方に移動させて、下糸通過穴を右側位置に切換えることで下糸も縫針の右側に位置するので、ヒッチステッチを防止することができる。また、布送り方向によって縫針の目孔から延びる上糸が縫針の左側に絡むときには、駆動手段により釜止め部材を左方に移動させて、下糸通過穴を左側位置に切換えることで下糸も縫針の左側に位置するので、ヒッチステッチを防止することができる。 That is, when the upper thread extending from the stitch hole of the sewing needle is entangled on the right side of the sewing needle depending on the cloth feeding direction, the lower thread passing hole is moved to the right position by the driving means, and the lower thread passing hole is switched to the right position. Since it is located on the right side of the sewing needle, hitch stitches can be prevented. In addition, when the upper thread extending from the stitch hole of the sewing needle is entangled on the left side of the sewing needle depending on the cloth feed direction, the lower thread passing hole is moved to the left position by the driving means and the lower thread passing hole is switched to the left position. Since it is located on the left side of the sewing needle, hitch stitches can be prevented .
本実施例のミシンの全回転釜は、中釜に形成された下糸案内部の右端部に形成された係止壁部の周方向幅を、内周側から外周側へ向かってリニアに小さくなるように構成し、しかも、釜止め部材に有する二股部を構成する左右1対の突出部を同形状で且つ小型化することで、中釜を反時計回りと同様に時計回りにも大きく回動できるようにしてある。更に、下糸案内部の係止壁部に形成した上糸通過穴を左方又は右方に回動させることで、加工布の布送り方向が何れであっても、ヒッチステッチが発生しないようにしてある。 In the full rotation shuttle of the sewing machine of this embodiment, the circumferential width of the locking wall formed at the right end of the lower thread guide formed in the center hook is linearly reduced from the inner peripheral side to the outer peripheral side. In addition, the pair of left and right protrusions that make up the bifurcated portion of the hook-stopping member have the same shape and size, so that the inner hook can be rotated clockwise as well as counterclockwise. It can be moved. Furthermore, by turning the upper thread passage hole formed in the locking wall portion of the lower thread guide portion to the left or right, the hitch stitch does not occur regardless of the cloth feed direction of the work cloth. It is.
先ず、ミシンのベッド部に設けられた垂直全回転釜1について説明する。
図1に示すように、垂直全回転釜1は、高速千鳥縫い用の全回転釜であり、後述する下軸8により回転可能に設けられる外釜2と、この外釜2に嵌まり込んで外釜2に対して相対回転自在に装着された中釜3と、中釜3に装着されるボビンケース4と、針板5に取付けられ中釜3が回転しないように拘束する釜止め部材7とを含んで構成される。
First, the vertical full rotary hook 1 provided on the bed portion of the sewing machine will be described.
As shown in FIG. 1, the vertical full rotary hook 1 is a full rotary hook for high-speed zigzag stitching, and an outer hook 2 that is rotatably provided by a lower shaft 8 described later, and the outer hook 2 is fitted into the outer hook 2. An inner hook 3 mounted so as to be rotatable relative to the outer hook 2, a bobbin case 4 attached to the inner hook 3, and a hook stopper 7 attached to the needle plate 5 and restraining the inner hook 3 from rotating. It is comprised including.
外釜2は外釜本体10と、この外釜本体10に連なる回転軸11とを有し、ミシンの主軸(図示略)と同期して回転する下軸8から回転軸11に回転力が伝達されることによって、縫針6の上下動に同期して回転軸11の軸心回りに正面視にて時計回りに回転駆動される。ここで、外釜本体10には、時計回りの回転方向に向けた剣先12が形成されている。 The outer hook 2 has an outer hook main body 10 and a rotary shaft 11 connected to the outer hook main body 10, and rotational force is transmitted from the lower shaft 8 rotating in synchronization with the main shaft (not shown) of the sewing machine to the rotary shaft 11. Thus, in synchronization with the vertical movement of the sewing needle 6, it is rotated clockwise around the axis of the rotary shaft 11 in a front view. Here, the outer hook body 10 is formed with a sword tip 12 oriented in the clockwise rotation direction.
中釜3は中釜本体15とスタッド16とを有し、外釜本体10に同軸に嵌まり込んで、相互に回転可能に支持される。スタッド16は、中釜本体15の底部から中釜本体15の開放端側に水平に延びるように突出して設けられる。 The inner hook 3 has an inner hook body 15 and a stud 16 and is fitted coaxially to the outer hook body 10 and is supported so as to be mutually rotatable. The stud 16 is provided so as to protrude horizontally from the bottom of the inner hook body 15 to the open end side of the inner hook body 15.
ボビンケース4は、図4,図5に示すように、前面が塞がれた筒体であり、中釜3に相対的な回転が阻止された状態で装着され、下糸DTが巻装された下糸ボビン(図示略)を収納している。そこで、下軸8の回転による回転力が垂直全回転釜1に伝達されると、外釜2が縫針6の上下動に同期して、中釜3を釜止め部材7で回転しないように拘束した状態で、正面視にて時計回りに回転駆動される。 As shown in FIGS. 4 and 5, the bobbin case 4 is a cylindrical body whose front is closed, and is mounted on the inner hook 3 in a state in which relative rotation is prevented, and the lower thread DT is wound thereon. The lower bobbin (not shown) is stored. Therefore, when the rotational force due to the rotation of the lower shaft 8 is transmitted to the vertical full rotary hook 1, the outer hook 2 is restrained from rotating the inner hook 3 by the hook stopper member 7 in synchronization with the vertical movement of the sewing needle 6. In this state, it is rotated clockwise in front view.
外釜2が下軸8により回転されることによって、加工布Wを挿通した縫針6の目孔6aから延びる上糸UTの上糸ループUTaが剣先12によって捕捉され、中釜3の周囲を周回し、これによって縫針6の目孔6aから延びる上糸ループUTaと下糸ボビンから延びる下糸DTとが交絡され、図示しない天秤によって上糸ループUTaが引き締められることにより、縫目が形成される。ここで、縫針6の目孔6aは前後方向向きに形成され、天秤から供給される上糸UTはこの目孔6aに後方から前方に向けて糸通しされている。 When the outer hook 2 is rotated by the lower shaft 8, the upper thread loop UTa of the upper thread UT extending from the eye hole 6 a of the sewing needle 6 through which the work cloth W is inserted is captured by the sword tip 12 and circulates around the inner hook 3. Thus, the upper thread loop UTa extending from the eye hole 6a of the sewing needle 6 and the lower thread DT extending from the lower thread bobbin are entangled, and the upper thread loop UTa is tightened by a balance (not shown), thereby forming a stitch. . Here, the eye hole 6a of the sewing needle 6 is formed in the front-rear direction, and the upper thread UT supplied from the balance is threaded through the eye hole 6a from the rear to the front.
中釜3の上側に一体的に張り出した下糸案内部3aが形成され、この下糸案内部3aには、釜止め部材7の左側係合部7aが挿入される係止穴部3bが形成されている。下糸案内部3aのうちの係止穴部3bよりも右側端部(外釜回転方向前進側端部)に係止壁部3cが形成され、この係止壁部3cの下端部に小さな下糸通過穴3dが形成されている。 A lower thread guide portion 3a that integrally projects on the upper side of the inner hook 3 is formed, and a locking hole portion 3b into which the left engagement portion 7a of the hook stopper member 7 is inserted is formed in the lower thread guide portion 3a. Has been. A locking wall portion 3c is formed at the right end portion (end portion on the forward side in the outer hook rotation direction) of the locking hole portion 3b in the lower thread guide portion 3a, and a small lower portion is formed at the lower end portion of the locking wall portion 3c. A thread passage hole 3d is formed.
更に、下糸通過穴3dよりも上側において、図8に示すように、係止壁部3cの上端部の後面に後方へ膨らませた膨出部3fが形成され、下糸通過穴3dを通過した下糸DTが膨出部3fで案内され、針板5の針穴5aに向かうようになっている。 Further, on the upper side of the lower thread passage hole 3d, as shown in FIG. 8, a bulging portion 3f bulging rearward is formed on the rear surface of the upper end portion of the locking wall portion 3c, and passes through the lower thread passage hole 3d. The lower thread DT is guided by the bulging portion 3 f and is directed toward the needle hole 5 a of the needle plate 5.
係止壁部3cの右端側縁(外釜回転方向前進側端縁)のうちの内周側端部以外の部分が内周側端部よりも右側(外釜回転方向前進側)へ突出しないように構成されている。即ち、係止壁部3cの周方向幅は、内周側から外周側へ向かってリニアに減少するように形成されている。 Of the right end side edge (outer hook rotation direction advance side edge) of the locking wall portion 3c, a portion other than the inner periphery side end part does not protrude to the right side (outer pot rotation direction advance side) from the inner periphery side end part. It is configured as follows. That is, the circumferential width of the locking wall 3c is formed so as to linearly decrease from the inner peripheral side toward the outer peripheral side.
ところで、図4,図8に示すように、ボビンケース4の外周壁4aのうちの右肩の部位に、内部の下糸ボビンから外部に引き出される下糸DTに付与する糸張力を調節可能な糸調子バネ18が付設されている。従って、下糸DTは、糸調子バネ18と外周壁4aとの間を通り、糸調子バネ18の先端部の下糸出口19を経て外部に引き出される。 By the way, as shown in FIGS. 4 and 8, the thread tension applied to the lower thread DT drawn out from the inner lower thread bobbin to the right shoulder portion of the outer peripheral wall 4a of the bobbin case 4 can be adjusted. A thread tension spring 18 is attached. Accordingly, the lower thread DT passes between the thread tension spring 18 and the outer peripheral wall 4a, and is drawn out through the lower thread outlet 19 at the tip of the thread tension spring 18.
次に、ボビンケース4の前面左側に固着された糸案内部材20について説明する。
図1,図3〜図5に示すように、糸案内部材20は、正面視にて小判形状であり、ボビンケース4の前面のうち縫針6の上下動軌跡の延長線Nよりも左側に配設され、この下半部分において固着されている。そして、この上半部分が前方に所定角度だけ曲げ形成(図5参照)されている。糸案内部材20の上半部分には、下糸DTを係合可能な下糸案内穴20aが形成されている。
Next, the yarn guide member 20 fixed to the front left side of the bobbin case 4 will be described.
As shown in FIGS. 1 to 3, the thread guide member 20 has an oval shape when viewed from the front, and is arranged on the left side of the front surface of the bobbin case 4 with respect to the extension line N of the vertical movement locus of the sewing needle 6. And is fixed in the lower half portion. The upper half is bent forward by a predetermined angle (see FIG. 5). A lower thread guide hole 20a capable of engaging with the lower thread DT is formed in the upper half portion of the thread guide member 20.
ボビンケース4の前面部には、更に、図4,図5に示すように、下糸出口19から糸案内部材20の上半部分に向かう案内溝20bが左下がりに傾斜した直線状に形成されている。そこで、ボビンケース4の下糸出口19から引き出された下糸DTは、この案内溝20bに案内されて糸案内部材20の下糸案内穴20aを後側から前側に通され、上側の下糸通過穴3dを前面側から挿通し、斜め上側に延びて針板5の針穴5aを経て加工布Wに連なっている。 As shown in FIGS. 4 and 5, a guide groove 20b from the lower thread outlet 19 to the upper half of the thread guide member 20 is further formed on the front surface of the bobbin case 4 in a straight line inclined downwardly to the left. ing. Therefore, the lower thread DT pulled out from the lower thread outlet 19 of the bobbin case 4 is guided by the guide groove 20b and passed from the rear side to the front side through the lower thread guide hole 20a of the thread guide member 20, and the upper lower thread. The passage hole 3d is inserted from the front side, extends obliquely upward, and continues to the work cloth W through the needle hole 5a of the needle plate 5.
次に、釜止め部材7を左右方向へ所定ストローク移動駆動可能な釜止め駆動機構(駆動手段)25について説明する。
図6〜図8に示すように、垂直全回転釜1よりも前側の針板5の下面に、左右方向向きのスライド部材26が配置されている。このスライド部材26は、これに形成された左右方向に長い1対の長穴26aを介して段付き螺子27で針板5の下面に左右方向移動可能に支持されている。
Next, a hook stop driving mechanism (drive means) 25 capable of driving the hook stopper member 7 by a predetermined stroke in the left-right direction will be described.
As shown in FIGS. 6 to 8, a slide member 26 facing in the left-right direction is disposed on the lower surface of the needle plate 5 in front of the vertical full rotary hook 1. The slide member 26 is supported on the lower surface of the needle plate 5 by a stepped screw 27 through a pair of elongated holes 26a formed in the left and right direction so as to be movable in the left and right direction.
このスライド部材26には、前後方向に向けた釜止め部材7の前端部が螺子28で固定されている。釜止め部材7の後端部はやや上向きに湾曲し、この湾曲した二股部に左右両係合部7a,7bが形成されている。これら左右両係合部7a,7bから二股部が構成されている。左側係合部7aは中釜3の係止穴部3bに挿入され、右側係合部7bは中釜3の係止壁部3cの右側端縁に当接している。即ち、係止壁部3cは左右両係合部7a,7bにより係止されるので、中釜3の回動位置が位置決めされている。これら左右両係合部7a,7bは同じ高さ寸法を有する同様の形状であり、小型化されている。 A front end portion of the hook member 7 facing in the front-rear direction is fixed to the slide member 26 with a screw 28. The rear end portion of the hooking member 7 is slightly upwardly curved, and left and right engaging portions 7a and 7b are formed at the curved bifurcated portion. These left and right engaging portions 7a and 7b constitute a bifurcated portion. The left engaging portion 7 a is inserted into the locking hole 3 b of the inner hook 3, and the right engaging portion 7 b is in contact with the right edge of the locking wall portion 3 c of the inner hook 3. That is, since the locking wall portion 3c is locked by the left and right engaging portions 7a and 7b, the rotation position of the inner hook 3 is positioned. These left and right engaging portions 7a and 7b have the same shape having the same height and are miniaturized.
スライド部材26の直ぐ左側に、下面にラック歯30aを形成したラック部材30が連結され、針板5の下面に左右方向スライド可能に支持されている。更に、このラック部材30から前側の位置に後向きに配置された切換えモータ31が針板5の下面に固着されている。この駆動軸にピニオン32が固定され、このピニオン32がラック部材30のラック歯30aに噛み合っている。この切換えモータ31はステッピングモータからなっている。 A rack member 30 having rack teeth 30a formed on the lower surface is connected to the left side of the slide member 26, and is supported on the lower surface of the needle plate 5 so as to be slidable in the left-right direction. Further, a switching motor 31 disposed rearward from the rack member 30 at a front position is fixed to the lower surface of the needle plate 5. A pinion 32 is fixed to the drive shaft, and the pinion 32 meshes with the rack teeth 30 a of the rack member 30. The switching motor 31 is a stepping motor.
それ故、切換えモータ31が正面視にて反時計回りに回転すると、ラック部材30とスライド部材26とが一体的に左方に移動するので、釜止め部材7も同時に左方に所定ストロークだけ移動し、釜止め部材7と係止壁部3cの係合を介して中釜3が反時計回り(図1参照)に回動する。このとき、下糸通過穴3dは縫針6の上下動軌跡の延長線Nに対して左側の左側位置に移動し、この下糸通過穴3dを前面側から後方に挿通した下糸DTは、膨出部3fで案内されてから右斜め上側の針穴5aに向かう。 Therefore, when the switching motor 31 rotates counterclockwise when viewed from the front, the rack member 30 and the slide member 26 are integrally moved to the left, so that the hook stopper 7 is simultaneously moved to the left by a predetermined stroke. Then, the intermediate hook 3 rotates counterclockwise (see FIG. 1) through the engagement between the hook stopper member 7 and the locking wall portion 3c. At this time, the lower thread passage hole 3d moves to the left position on the left side with respect to the extension line N of the vertical movement locus of the sewing needle 6, and the lower thread DT inserted through the lower thread passage hole 3d rearward from the front side is expanded. After being guided by the exit portion 3f, it heads toward the needle hole 5a on the upper right side.
この状態で縫針6が針穴5aを経て針板5の下側に下降してくると、針穴5aを挿通して下糸通過穴3dに至る下糸DTは弛むことなく張った状態で必ず縫針6の左側に位置することになる。それ故、XY座標の+Y方向を0°とした場合に、下糸通過穴3dが左側位置に切換えられている場合であって、縫目形成方向θ(布送り方向と反対方向)が、180°〜220°付近の場合に、図9に示すヒッチステッチ(HSにて図示)が発生する範囲を避けることになり、ヒッチステッチを防止することができる。 In this state, when the sewing needle 6 descends to the lower side of the needle plate 5 through the needle hole 5a, the lower thread DT that passes through the needle hole 5a and reaches the lower thread passage hole 3d is always stretched without being loosened. It is located on the left side of the sewing needle 6. Therefore, when the + Y direction of the XY coordinates is set to 0 °, the lower thread passage hole 3d is switched to the left position, and the stitch formation direction θ (the direction opposite to the cloth feed direction) is 180. In the case of around ˜220 °, the range where hitch stitches (illustrated by HS) shown in FIG. 9 occur is avoided, and hitch stitches can be prevented.
切換えモータ31が正面視にて時計回りに回転すると、ラック部材30とスライド部材26とが一体的に右方に移動(図6参照)するので、釜止め部材7も同時に右方に所定ストロークだけ移動し、釜止め部材7と係止壁部3cの係合を介して中釜3が時計回り(図10参照)に回動する。このとき、下糸通過穴3dは縫針6の上下動軌跡の延長線Nに対して右側の右側位置に移動し、この下糸通過穴3dを前面側から後方に挿通した下糸DTは膨出部3fで案内されてから左斜め上側の針穴5aに向かう。 When the switching motor 31 is rotated clockwise in front view, the rack member 30 and the slide member 26 are integrally moved to the right (see FIG. 6), so that the hook member 7 is simultaneously moved to the right by a predetermined stroke. The intermediate hook 3 rotates clockwise (see FIG. 10) through the engagement of the hook stopper member 7 and the locking wall portion 3c. At this time, the lower thread passage hole 3d moves to the right position on the right side with respect to the extension line N of the vertical movement locus of the sewing needle 6, and the lower thread DT inserted through the lower thread passage hole 3d rearward from the front side bulges. After being guided by the portion 3f, it heads toward the upper left needle hole 5a.
この状態で縫針6が針穴5aを経て針板5の下側に下降してくると、針穴5aを後側から前側に挿通して下糸通過穴3dに至る下糸DTは弛むことなく張った状態で必ず縫針6の右側に位置していることになる。それ故、XY座標の+Y方向を0°とした場合に、下糸通過穴3dが右側位置に切換えられている場合であって、縫目形成方向θ(布送り方向と反対方向)が、140°〜180°付近の場合に、図11に示すヒッチステッチ(HSにて図示)が発生する範囲を避けることになり、ヒッチステッチを防止することができる。 When the sewing needle 6 descends to the lower side of the needle plate 5 through the needle hole 5a in this state, the lower thread DT that passes through the needle hole 5a from the rear side to the front side and reaches the lower thread passage hole 3d is not loosened. It is always located on the right side of the sewing needle 6 in the tensioned state. Therefore, when the + Y direction of the XY coordinates is set to 0 °, the lower thread passage hole 3d is switched to the right position, and the stitch formation direction θ (the direction opposite to the cloth feed direction) is 140. In the case of around ˜180 °, the range where the hitch stitch (shown by HS) shown in FIG. 11 occurs is avoided, and the hitch stitch can be prevented.
次に、このように構成された垂直全回転釜1の作動及び効果について説明する。
図8に示すように、ボビンケース4に収容された下糸ボビンの下糸DTは、下糸出口19から案内溝20bを経て糸案内部材20の下糸案内穴20aを経た後、下糸通過穴3dを前面側から挿通して膨出部3fで案内されてから、針穴5aを経由して針板5の上側の加工布Wに連なっている。
Next, the operation and effect of the vertical full rotary hook 1 configured as described above will be described.
As shown in FIG. 8, the lower thread DT of the lower thread bobbin accommodated in the bobbin case 4 passes through the lower thread guide hole 20a from the lower thread outlet 19 through the guide groove 20b, and then passes through the lower thread guide hole 20a. After passing through the hole 3d from the front side and being guided by the bulging portion 3f, it is connected to the work cloth W on the upper side of the needle plate 5 via the needle hole 5a.
縫製途中の縫目形成方向が前方且つ右方の場合、つまり図1,図8に示すように、布送り方向が後方且つ左方の場合には、図1に示すように、釜止め駆動機構25により釜止め部材7が左方に移動して、下糸通過穴3dが縫針6の上下動軌跡の延長線Nに対して左側の左側位置に移動される。この場合には、上糸UTは縫針6の左側に位置し且つ下糸DTも張った状態で縫針6の左側に位置するようになるので、ヒッチステッチの発生を確実に防止することができる。 When the stitch formation direction during sewing is forward and right, that is, when the cloth feed direction is backward and left as shown in FIGS. 1 and 8, as shown in FIG. 25, the hook stopper 7 is moved to the left, and the lower thread passage hole 3 d is moved to the left position on the left side with respect to the extension line N of the vertical movement locus of the sewing needle 6. In this case, since the upper thread UT is positioned on the left side of the sewing needle 6 and the lower thread DT is also tensioned, the upper thread UT is positioned on the left side of the sewing needle 6. Therefore, it is possible to reliably prevent hitch stitches from occurring.
縫製途中の縫目形成方向が前方且つ左方の場合、つまり図8,図10に示すように、布送り方向が後方且つ右方の場合には、釜止め駆動機構25により釜止め部材7が右方に移動して下糸通過穴3dが右側位置に移動される(図6参照)。このとき、係止壁部3cの右側端縁のうちの内周側端部以外の部分が内周側端部よりも右側へ突出しないように構成されている。 When the stitch forming direction during sewing is forward and left, that is, as shown in FIGS. 8 and 10, when the cloth feed direction is backward and right, the hook stopper member 7 is moved by the hook stopper drive mechanism 25. Moving to the right, the lower thread passage hole 3d is moved to the right position (see FIG. 6). At this time, it is comprised so that parts other than the inner peripheral side edge part of the right side edge of the locking wall part 3c may not protrude rightward rather than an inner peripheral side edge part.
それ故、右側係合部7bと係止壁部3cとが干渉することがなく、釜止め部材7は所定ストローク分右方に移動することができ、中釜3は下糸案内部3aを介して時計回りに大きく回動することができる。この場合には、上糸UTは縫針6の右側に位置し且つ下糸DTも張った状態で縫針6の右側に位置するようになるので、この場合にも、ヒッチステッチの発生を確実に防止することができる。 Therefore, the right engaging portion 7b and the locking wall portion 3c do not interfere with each other, and the hook stopper member 7 can move to the right by a predetermined stroke, and the inner hook 3 is interposed via the lower thread guide portion 3a. Can be rotated clockwise. In this case, the upper thread UT is located on the right side of the sewing needle 6 and the lower thread DT is also located on the right side of the sewing needle 6 so that hitch stitches can be reliably prevented. can do.
係止壁部3cの周方向幅は、内周側から外周側へ向かってリニアに減少するように形成されているので、釜止め部材が左右方向へ移動する移動距離に応じて、中釜の回動角度を係止壁部を介して比例的に変化させることができる。 Since the circumferential width of the locking wall portion 3c is formed so as to decrease linearly from the inner peripheral side toward the outer peripheral side, depending on the moving distance of the hook stopper member moving in the left-right direction, The rotation angle can be changed proportionally via the locking wall.
図10に示すように、中釜3が時計回りに大きく回動した場合でも、右側係合部7bと係止壁部3cとの間に、下糸UTが通過するのに充分な隙間が形成されているため、天秤による糸引き締めに時に、外釜2と中釜3の間を挿通した上糸UTが右側突出部7bと係止壁部3cとの間を何ら抵抗なく糸抜けすることができ、結果的に、糸締まりが良好になる。 As shown in FIG. 10, even when the inner hook 3 is greatly rotated clockwise, a sufficient gap is formed between the right engaging portion 7b and the locking wall portion 3c so that the lower thread UT can pass therethrough. Therefore, when tightening the thread with the balance, the upper thread UT inserted between the outer hook 2 and the inner hook 3 may pull out the thread between the right protruding portion 7b and the locking wall portion 3c without any resistance. As a result, the thread tightening is improved.
次に、前記実施例を部分的に変更した変更形態について説明する。
1)釜止め駆動機構25は、切換えモータ31とラック部材30を設けない手動式の切換え機構であってもよい。この場合には、縫目形成方向により、ヒッチステッチが発生しないように、作業者が釜止め部材7を手動で左方又は右方に適宜切換えることができる。
Next, a modified embodiment in which the above embodiment is partially modified will be described.
1) The hook stop driving mechanism 25 may be a manual switching mechanism in which the switching motor 31 and the rack member 30 are not provided. In this case, depending on the stitch formation direction, the operator can manually switch the hook stopper 7 to the left or right appropriately so that hitch stitch does not occur.
2)ボビンケース4に設けた糸案内部材20を省略し、ボビンケース4の下糸出口19から外部に出た下糸DTを下糸通過穴3dに直接導くようにしてもよい。この場合にも、前述した実施例と同様の効果を得ることができる。 2 ) The thread guide member 20 provided in the bobbin case 4 may be omitted, and the lower thread DT that has come out from the lower thread outlet 19 of the bobbin case 4 may be directly guided to the lower thread passage hole 3d. Also in this case, the same effect as the above-described embodiment can be obtained.
1 垂直全回転釜
2 外釜
3 中釜
3a 下糸案内部
3b 係止穴部
3c 係止壁部
3d 下糸通過穴
4 ボビンケース
5 針板
6 縫針
7 釜止め部材
7a 左側係合部
7b 右側係合部
20 糸案内部材
25 釜止め駆動機構
30 ラック部材
31 切換えモータ
32 ピニオン
N 縫針の上下動軌跡の延長線
DESCRIPTION OF SYMBOLS 1 Vertical full rotation hook 2 Outer hook 3 Middle hook 3a Lower thread guide part 3b Locking hole part 3c Locking wall part 3d Lower thread passage hole 4 Bobbin case 5 Needle plate 6 Sewing needle 7 Locking member 7a Left side engaging part 7b Right side Engagement part 20 Thread guide member 25 Retaining drive mechanism 30 Rack member 31 Switching motor 32 Pinion N Extension line of the vertical movement locus of the sewing needle
Claims (2)
前記中釜は、下糸案内部と、この下糸案内部に形成された係止穴部と、前記下糸案内部のうちの前記係止穴部よりも外釜回転方向前進側の係止壁部を有し、
前記係止壁部に下糸通過穴が形成されると共に前記係止壁部の上端部の下軸側後面に後方へ膨らませた膨出部が形成され、
前記釜止め部材は、前記係止壁部に外釜回転方向の両側から当接可能な1対の係合部を有する二股部を有すると共に水平方向位置を調節可能に構成され、
前記係止壁部の周方向幅が中釜の回転中心側から中釜の径方向外側へ向かってリニアに減少するように形成されると共に、前記二股部の1対の係合部は同様の形状に形成されたことを特徴とするミシンの全回転釜。 An outer hook that rotates integrally with the lower shaft in synchronization with the vertical movement of the sewing needle below the needle plate of the sewing machine, an inner hook that is relatively rotatably attached to the outer hook, and an inner hook that is attached to the needle plate In a full rotation hook of a sewing machine having a hook stopper member that restrains the rotation of the sewing machine and a bobbin case that is detachably attached to the inner hook,
The inner hook has a lower thread guide portion, an engagement hole formed in the lower thread guide portion, and an engagement of the lower thread guide portion closer to the outer hook rotation direction than the engagement hole portion. Has a wall,
A bobbin thread passage hole is formed in the locking wall portion, and a bulging portion bulging backward is formed on the lower shaft side rear surface of the upper end portion of the locking wall portion ,
The hook stopper member is adjustably configure the horizontal position as well as have a bifurcated portion having an engagement portion of the locking wall pair capable of contacting the opposite sides of the outer hook rotating direction unit,
The circumferential width of the locking wall portion is formed so as to linearly decrease from the rotation center side of the inner hook toward the outer side in the radial direction of the inner hook, and the pair of engaging portions of the bifurcated portion has the same A sewing machine full-rotation hook characterized by its shape .
前記駆動手段で釜止め部材を移動駆動することで、前記下糸通過穴を縫針の上下動軌跡の延長線に対して左側に位置する左側位置と右側に位置する右側位置とに択一的に切換え可能に構成したことを特徴とする請求項1に記載のミシンの全回転釜。 Provided with drive means capable of driving the hook stopper member to move in the left-right direction by a predetermined stroke,
By moving and driving the hook stopper member with the driving means, the lower thread passage hole is alternatively positioned on the left side positioned on the left side and the right side position positioned on the right side with respect to the extension line of the vertical movement locus of the sewing needle. 2. The full rotary shuttle of the sewing machine according to claim 1 , wherein the sewing machine is configured to be switchable .
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US3386400A (en) * | 1967-10-16 | 1968-06-04 | Singer Co | Bobbin thread preplenishment mechanism for lockstitch sewing machines |
JPS58149165U (en) * | 1982-03-31 | 1983-10-06 | ジューキ株式会社 | Stitch forming mechanism of cycle sewing machine |
JPS58169486A (en) * | 1982-03-31 | 1983-10-05 | ジューキ株式会社 | Stitch line forming mechanism of cycle sewing machine |
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