JP2017124067A - Bobbin case of sewing machine - Google Patents

Bobbin case of sewing machine Download PDF

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Publication number
JP2017124067A
JP2017124067A JP2016005760A JP2016005760A JP2017124067A JP 2017124067 A JP2017124067 A JP 2017124067A JP 2016005760 A JP2016005760 A JP 2016005760A JP 2016005760 A JP2016005760 A JP 2016005760A JP 2017124067 A JP2017124067 A JP 2017124067A
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thread
bobbin
bobbin case
sewing machine
corner
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JP6692573B2 (en
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宏彰 菅
Hiroaki Suga
宏彰 菅
理人 ▲柳▼沢
理人 ▲柳▼沢
masato Yanagisawa
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Juki Corp
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Juki Corp
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Priority to JP2016005760A priority Critical patent/JP6692573B2/en
Priority to DE102017100603.6A priority patent/DE102017100603A1/en
Priority to CN201710028312.7A priority patent/CN106978679A/en
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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B57/00—Loop takers, e.g. loopers
    • D05B57/26—Bobbin holders or casings; Bobbin holder or case guards; Bobbin discharge devices

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

Abstract

PROBLEM TO BE SOLVED: To prevent a bobbin thread from being reversely twisted while applying large thread tension to the bobbin thread.SOLUTION: A bobbin case 40 of a sewing machine for storing a bobbin 31 of a bobbin thread therein includes a rotation stopper part 46 which is extended to the outside in the radial direction of a side wall part 42 surrounding the bobbin 31. The rotation stopper part 46 is provided with at least two thread insertion parts 461 and 462 for inserting the bobbin thread therethrough. At least one of the thread insertion parts may be a through hole, and at least one of the thread insertion parts may be a notch. The edge part of each thread insertion part may be chamfered or formed in a round shape. As a result, the bobbin thread passes through the rotation stopper while sliding on a plurality of corners, so that thread tension is strongly applied thereto while reverse twisting is avoided.SELECTED DRAWING: Figure 3

Description

本発明は、ミシンのボビンケースに関する。   The present invention relates to a bobbin case for a sewing machine.

ミシンの下糸はボビンに巻かれた状態で、針板の下側の中釜の中心において、ボビンケース内に格納されている。
ボビンケースは、中釜の中心にあって、当該中釜と共に半回転動作を行わないように、前面から半径方向外側に延出された回り止め部が延出されており、当該回り止め部の先端部が中釜押さえの凹所に嵌合されている。また、この回り止め部の先端部には、下糸を通す糸挿通孔が貫通形成されており、回り止め部が下糸を上方にガイドする機能も果たしていた。
また、ボビンケースの外周には、下糸を繰り出すスリット状の開口が形成され、当該開口を塞ぐようにして薄板状の糸調子バネが取り付けられている。この糸調子バネは、繰り出される下糸をボビンケースの外周面との間で挟み、挟持圧を下糸に付与することで下糸に糸張力を付与していた。また、糸調子バネには、下糸の挟持圧を調節するためのネジが設けられており、作業者が工具を使用してネジを回すことにより、下糸の糸張力の調節が行われていた（例えば、特許文献１参照）。 The lower thread of the sewing machine is wound around the bobbin and stored in the bobbin case at the center of the lower hook of the needle plate.
The bobbin case is located at the center of the inner hook and has a non-rotating portion extending radially outward from the front so as not to perform a half-rotation operation together with the inner hook. The tip is fitted into the recess of the inner hook presser. Further, a thread insertion hole through which the lower thread is passed is formed at the tip of the detent part, and the detent part also functions to guide the lower thread upward.
In addition, a slit-like opening for feeding the lower thread is formed on the outer periphery of the bobbin case, and a thin-plate thread tension spring is attached so as to close the opening. In this thread tension spring, the lower thread to be fed is pinched between the outer peripheral surface of the bobbin case, and a tension pressure is applied to the lower thread by applying a clamping pressure to the lower thread. The thread tension spring is provided with a screw for adjusting the clamping pressure of the lower thread, and the thread tension of the lower thread is adjusted by the operator turning the screw with a tool. (For example, see Patent Document 1).

特開平８−２５７２８１号公報JP-A-8-257281

被縫製物の材質、厚さ、硬さ等によっては、下糸の張力をより強くする必要が生じる場合がある。
上記従来のボビンケースでは、下糸の張力をより強くするためには、糸調子バネをボビンケースの外周面側により強く押しつけて、下糸を強力に挟む必要がある。
しかしながら、下糸をより強力に挟持すると、狭い隙間を通過する下糸に撚り戻しが生じ、下糸を構成する細糸の隙間に中釜の剣先が入り込んで引っ掛かりを生じ、縫製ができなくなるおそれがあった。 Depending on the material, thickness, hardness, etc. of the material to be sewn, it may be necessary to increase the tension of the lower thread.
In the above-described conventional bobbin case, in order to further increase the tension of the lower thread, it is necessary to strongly press the thread tension spring toward the outer peripheral surface side of the bobbin case and pinch the lower thread strongly.
However, if the lower thread is pinched more strongly, the lower thread passing through the narrow gap may be twisted back, and the hook of the inner hook may get caught in the gap between the thin threads that make up the lower thread, which may prevent sewing. was there.

本発明は、下糸に十分な張力を付与しつつ良好な縫製を行うことをその目的とする。   An object of the present invention is to perform satisfactory sewing while applying sufficient tension to the lower thread.

請求項１記載の発明は、ミシンのボビンケースにおいて、
下糸のボビンを内部に収容するミシンのボビンケースにおいて、
前記ボビンを囲繞する側壁部の半径方向外側に延出された回り止め部を備え、
前記回り止め部に下糸を挿通する糸挿通部を少なくとも二つ設けたことを特徴とする。 The invention according to claim 1 is the bobbin case of the sewing machine.
In the bobbin case of the sewing machine that houses the bobbin of the lower thread inside,
A detent portion extending radially outward of the side wall surrounding the bobbin;
The anti-rotation portion is provided with at least two thread insertion portions through which a lower thread is inserted.

請求項２記載の発明は、請求項１記載のミシンのボビンケースにおいて、
少なくとも一つの前記糸挿通部は貫通孔であることを特徴とする。 The invention according to claim 2 is the bobbin case of the sewing machine according to claim 1,
At least one of the thread insertion portions is a through hole.

請求項３記載の発明は、請求項１又は２記載のミシンのボビンケースにおいて、
少なくとも一つの前記糸挿通部は切り欠きであることを特徴とする。 The invention according to claim 3 is the bobbin case of the sewing machine according to claim 1 or 2,
At least one of the thread insertion portions is a notch.

請求項４記載の発明は、請求項１から３のいずれか一項に記載のミシンのボビンケースにおいて、
前記糸挿通部の縁部に面取り又は丸み形状が施されていることを特徴とする。 The invention according to claim 4 is the bobbin case of the sewing machine according to any one of claims 1 to 3,
The edge of the thread insertion part is chamfered or rounded.

本発明は、ボビンケースの回り止め部に下糸を挿通する少なくとも二つの糸挿通部を設けたので、これらに下糸を挿通させることにより、下糸がより多くの角に摺動することとなり、糸挿通部が一つのみの場合に比べてより大きな糸張力を下糸に付与することが可能となる。
従って、より大きな糸張力を下糸に付与する必要がある場合に、糸調子バネで強力に締め付ける必要がなくなり、当該締め付けによる糸の撚り戻しの発生を効果的に低減し、剣先の絡みを効果的に回避して、良好な縫製を行うことが可能となる。 In the present invention, since at least two thread insertion parts for inserting the lower thread are provided in the rotation preventing part of the bobbin case, the lower thread slides to more corners by inserting the lower thread into these. As compared with the case where only one thread insertion portion is provided, it is possible to apply a greater thread tension to the lower thread.
Therefore, when it is necessary to apply a higher thread tension to the lower thread, there is no need to strongly tighten it with a thread tension spring, effectively reducing the occurrence of untwisting of the thread due to the tightening and effectively tangling the sword tip Therefore, good sewing can be performed.

ミシンに搭載される釜機構の主要な構成を示す分解斜視図である。It is a disassembled perspective view which shows the main structures of the shuttle mechanism mounted in a sewing machine. ボビンケースの斜め後方から見た斜視図である。It is the perspective view seen from the slanting back of the bobbin case. ボビンケースの一部省略した正面図である。It is the front view which abbreviate | omitted a part of bobbin case. ボビンケースの一部省略した左側面図である。It is the left view which abbreviate | omitted some bobbin cases. ボビンケースの変形例(1)の一部省略した正面図である。FIG. 10 is a front view of the bobbin case in which a modification (1) is partially omitted. ボビンケースの変形例(2)の一部省略した正面図である。FIG. 10 is a front view of the bobbin case with a part of modification (2) omitted.

［発明の実施形態の概略構成］
本発明の実施の形態としてミシンのボビンケース４０について図１〜図４に基づいて説明する。
ここで、ボビンケース４０を格納する中釜３３（後述）の回転中心線に沿った水平な方向をＹ軸方向とし、当該Ｙ軸方向の一方を「前」、他方を「後」とする。また、水平であってＹ軸方向に直交する方向をＸ軸方向とし、当該Ｘ軸方向に平行であって「後」方向を向いた状態で左手側を「左」とし、右手側を「右」とする。また、鉛直上下方向をＺ軸方向とし、その一方を「上」、他方を「下」とする。 [Schematic Configuration of Embodiment of the Invention]
A bobbin case 40 for a sewing machine will be described with reference to FIGS. 1 to 4 as an embodiment of the present invention.
Here, the horizontal direction along the rotation center line of the inner hook 33 (described later) that houses the bobbin case 40 is defined as the Y-axis direction, and one of the Y-axis directions is “front” and the other is “rear”. Also, the horizontal direction perpendicular to the Y-axis direction is the X-axis direction, the left-hand side is "left" in the state parallel to the X-axis direction and facing the "rear" direction, and the right-hand side is "right"" The vertical vertical direction is the Z-axis direction, one of which is “upper” and the other is “lower”.

［釜機構］
図１はミシンに搭載される釜機構３０の主要な構成を示す分解斜視図である。図１に示すように、釜機構３０は、ミシンモーターにより往復回動動作を付与されるドライバー３２と、ドライバー３２から往復回動が付与される半回転釜としての中釜３３と、中釜３３の内側に収納されたボビン３１及びボビンケース４０と、中釜３３を回動可能に格納する大釜３４と、大釜３４の前面に取り付けられて中釜３３が前方に脱落しないように押さえる中釜押さえ３５と、縫い糸を挿通する開口が形成された上バネ３６を備えている。 [Hook mechanism]
FIG. 1 is an exploded perspective view showing a main configuration of a shuttle mechanism 30 mounted on a sewing machine. As shown in FIG. 1, the shuttle mechanism 30 includes a driver 32 that is given a reciprocating rotation by a sewing machine motor, a middle shuttle 33 that is a half-rotating shuttle that is given a reciprocating rotation by the driver 32, and a middle shuttle 33. A bobbin 31 and a bobbin case 40 housed inside, a cauldron 34 that rotatably stores the inner hook 33, and an inner hook presser that is attached to the front surface of the cauldron 34 so that the inner hook 33 does not fall forward. 35 and an upper spring 36 in which an opening for inserting the sewing thread is formed.

上記大釜３４は、その内部に中釜３３の外周面に摺接する内周面が形成されており、この内周面に沿って滑らせるようにして中釜３３のＹ軸回りの回動を許容する構造となっている。
また、大釜３４は、中釜３３に往復回動を付与するドライバー３２を中釜３３と共に格納している。 The cauldron 34 has an inner peripheral surface that is slidably contacted with the outer peripheral surface of the inner hook 33 therein, and allows the inner hook 33 to rotate around the Y axis so as to slide along the inner peripheral surface. It has a structure to do.
Further, the cauldron 34 stores a driver 32 that gives reciprocating rotation to the inner hook 33 together with the inner hook 33.

中釜３３は前から見るとＹ軸方向を中心とする円周の一部が欠けた円形であり、ドライバー３２は、欠けた円周の一部分に対応する略円弧状である。
ドライバー３２は、大釜３４の後端部から内部に挿入されると共にミシンモーターによりＹ軸回りに往復回動を行う釜軸の前端部に固定されており、釜軸と共に往復回動を行う。
そして、ドライバー３２は、大釜３４の内部において、Ｙ軸を中心とする周方向における一端部と他端部の二つの接触点で往復回動方向に応じて交互に中釜３３に接触し、これら接触点が切り替わることを利用して、中釜３３とドライバー３２の間を上糸が通過することで上糸のループに中釜３３をくぐらせることを可能としている。 When viewed from the front, the inner hook 33 has a circular shape with a part of the circumference centered in the Y-axis direction, and the driver 32 has a substantially arc shape corresponding to a part of the lacked circumference.
The driver 32 is inserted into the inside from the rear end of the cauldron 34 and is fixed to the front end of the hook shaft that reciprocates around the Y axis by a sewing machine motor, and reciprocates together with the hook shaft.
Then, inside the cauldron 34, the driver 32 alternately contacts the inner hook 33 according to the reciprocating rotation direction at two contact points of one end and the other end in the circumferential direction around the Y axis. By utilizing the fact that the contact point is switched, the upper hook passes through between the inner hook 33 and the driver 32 so that the upper hook 33 can pass through the upper thread loop.

中釜３３は、ボビン３１及びボビンケース４０を格納保持する格納部３３１と、ボビン３１及びボビンケース４０を支持するために格納部３３１内に立設された支軸３３２と、大釜３４の内部に摺接するレール状の摺動部３３３と、摺動部３３３の一端部に形成されると共に半回転釜の前進回動時に（釜正面側から見て時計方向）縫い針から上糸のループをすくい取る剣先３３４とを備えている。   The inner hook 33 includes a storage portion 331 for storing and holding the bobbin 31 and the bobbin case 40, a support shaft 332 erected in the storage portion 331 for supporting the bobbin 31 and the bobbin case 40, and an inside of the cauldron 34. A rail-shaped sliding portion 333 that is in sliding contact with each other, and is formed at one end of the sliding portion 333 and scoops the loop of the upper thread from the sewing needle during forward rotation of the half-rotating hook (clockwise as viewed from the hook front side). And a sword tip 334.

格納部３３１の内部平坦面に垂直に立設されている支軸３３２は、中釜３３の回動中心に位置しており、中釜３３が大釜３４に格納された状態において、支軸３３２は、釜軸と同心となるように設けられている。   The support shaft 332 erected perpendicularly to the inner flat surface of the storage portion 331 is positioned at the center of rotation of the inner hook 33. In the state where the inner hook 33 is stored in the cauldron 34, the support shaft 332 is It is provided to be concentric with the shuttle shaft.

中釜押さえ３５は、大釜３４の前面部に取り付けられ、大釜３４の前側開口部を塞ぐ蓋体として機能する。この中釜押さえ３５により大釜３４内の中釜３３は前後方向に安定的に支持される。
また、中釜押さえ３５は、その中央部に大釜３４の前側開口部より小径の開口部３５１が形成されており、これにより、中釜３３内に格納されたボビンケース４０及びボビン３１を大釜３４の外側に取り出すことができる。 The inner hook press 35 is attached to the front portion of the cauldron 34 and functions as a lid for closing the front opening of the cauldron 34. The inner hook 33 in the large hook 34 is stably supported in the front-rear direction by the inner hook retainer 35.
Further, the inner hook retainer 35 is formed with an opening 351 having a smaller diameter than the front opening of the cauldron 34 at the center thereof, whereby the bobbin case 40 and the bobbin 31 stored in the inner hook 33 are connected to the cauldron 34. Can be taken out outside.

さらに、中釜押さえ３５の開口部３５１の内縁の前面側上部には、後方に凹んだ凹部３５２が形成されている。この凹部３５２には、後述するボビンケース４０の前面部から上方に延出された突起状の角部４６の上端部が嵌合し、往復回動を行う中釜３３に対して、ボビン３１及びボビンケース４０が回動しないように保持する。   Further, a recessed portion 352 that is recessed rearward is formed at the upper portion on the front side of the inner edge of the opening 351 of the inner hook retainer 35. The concave portion 352 is fitted with an upper end portion of a protruding corner portion 46 extending upward from a front surface portion of a bobbin case 40 to be described later, and the bobbin 31 and The bobbin case 40 is held so as not to rotate.

［ボビン］
ボビン３１は、中釜３３の支軸３３２が挿入される円筒部と当該円筒部の両端部にそれぞれ形成された外径の等しいフランジ部とからなり、これらは金属により一体的に形成されている。また、ボビン３１の二つのフランジ部の間で円筒部の外周に下糸が巻回されている。 [Bobbin]
The bobbin 31 includes a cylindrical portion into which the support shaft 332 of the inner hook 33 is inserted and flange portions having the same outer diameter formed at both ends of the cylindrical portion, which are integrally formed of metal. . A bobbin thread is wound around the outer periphery of the cylindrical portion between the two flange portions of the bobbin 31.

［ボビンケース］
図２はボビンケース４０の斜め後方から見た斜視図、図３は一部省略した正面図、図４は一部省略した左側面図である。
ボビンケース４０は、全体が金属から形成されており、各図に示すように、前面部４１及び側壁部４２から構成されるカバー４３と、中釜３３の支軸３３２に係合するラッチレバー４４と、側壁部４２の外周に沿って取り付けられた糸調子バネ４５と、前面部４１から上方に延出された回り止め部としての角（つの）部４６とを備えている。 [Bobbin case]
2 is a perspective view of the bobbin case 40 as viewed obliquely from the rear, FIG. 3 is a partially omitted front view, and FIG. 4 is a partially omitted left side view.
The bobbin case 40 is entirely made of metal, and as shown in each figure, a cover 43 composed of a front surface portion 41 and a side wall portion 42 and a latch lever 44 engaged with a support shaft 332 of the inner hook 33. And a thread tension spring 45 attached along the outer periphery of the side wall portion 42, and a corner portion 46 as a detent portion extending upward from the front surface portion 41.

カバー４３の側壁部４２は、ボビン３１のフランジ部の外径より幾分内径が大きな筒状を呈しており、ボビン３１を内側に格納することができる。
前面部４１は、側壁部４２の前端部を閉塞しており、ボビン３１は、閉塞されていない側壁部４２の後端部側から内部に挿入される。 The side wall portion 42 of the cover 43 has a cylindrical shape whose inner diameter is somewhat larger than the outer diameter of the flange portion of the bobbin 31, and can store the bobbin 31 inside.
The front surface portion 41 closes the front end portion of the side wall portion 42, and the bobbin 31 is inserted into the inside from the rear end portion side of the side wall portion 42 that is not closed.

ラッチレバー４４は、前面部４１に対して起伏回動操作することが可能となっている。そして、その中間部には開口部４４１が形成されており、ラッチレバー４４の臥伏状態で支軸３３２の先端部が開口部４４１に遊挿される。支軸３３２の先端部近傍には、支軸外周を一周するように図示しない周溝が形成されており、ラッチレバー４４の開口部４４１の内縁部が支軸３３２の周溝に嵌合して、ボビンケース４０が中釜３３から抜け落ちないように保持することができる。   The latch lever 44 can be rotated up and down with respect to the front surface portion 41. An opening 441 is formed at the intermediate portion, and the tip end portion of the support shaft 332 is loosely inserted into the opening 441 when the latch lever 44 is in the prone state. A circumferential groove (not shown) is formed in the vicinity of the distal end portion of the support shaft 332 so as to go around the outer periphery of the support shaft. The inner edge of the opening 441 of the latch lever 44 is fitted into the peripheral groove of the support shaft 332. The bobbin case 40 can be held so as not to fall out of the inner hook 33.

また、カバー４３の側壁部４２の上端部よりやや左側には、糸繰り出し穴４２１が貫通形成されている。この糸繰り出し穴４２１は、側壁部４２の後端縁部から切り込まれたスリット４２２につながっている。そして、ボビン３１をボビンケース４０の内側に格納した状態で、ボビン３１から引き出された下糸をスリット４２２から糸繰り出し穴４２１に容易に導くことができる。   Further, a thread feeding hole 421 is formed in a penetrating manner slightly to the left of the upper end portion of the side wall portion 42 of the cover 43. The yarn feeding hole 421 is connected to a slit 422 cut from the rear end edge of the side wall portion 42. In a state where the bobbin 31 is stored inside the bobbin case 40, the lower thread pulled out from the bobbin 31 can be easily guided from the slit 422 to the thread feeding hole 421.

糸調子バネ４５は、側壁部４２の周面に沿って湾曲しており、糸繰り出し穴４２１を外側から塞ぐ配置で側壁部４２に取り付けられている。これにより、糸繰り出し穴４２１から繰り出される下糸を側壁部４２と糸調子バネ４５との間に挟むことができ、その挟持圧によって生じる摺動抵抗により、繰り出される下糸に糸張力を付与している。
糸調子バネ４５は、側壁部４２の上端部から左下方に延出されており、上端部には、糸張力が付与された下糸が引き出される切り欠き状のガイド部４５１が形成され、下端部には，側壁部４２に形成された図示しないネジ穴に螺入された調節ネジ４５２が設けられている。この調節ネジ４５２を回転操作することにより、側壁部４２と糸調子バネ４５との隙間の幅を調節することができ、挟持圧を変えることができる。 The thread tension spring 45 is curved along the peripheral surface of the side wall part 42, and is attached to the side wall part 42 so as to close the yarn feeding hole 421 from the outside. As a result, the lower thread fed out from the thread feeding hole 421 can be sandwiched between the side wall portion 42 and the thread tension spring 45, and the sliding resistance generated by the clamping pressure gives the thread tension to the fed lower thread. ing.
The thread tension spring 45 extends from the upper end portion of the side wall portion 42 to the lower left, and a notch-shaped guide portion 451 from which a lower thread to which a thread tension is applied is drawn is formed at the upper end portion. The part is provided with an adjusting screw 452 that is screwed into a screw hole (not shown) formed in the side wall part 42. By rotating the adjustment screw 452, the width of the gap between the side wall portion 42 and the thread tension spring 45 can be adjusted, and the clamping pressure can be changed.

角部４６は、長尺板状であって、カバー４３の前面上部から幾分右側に傾斜した状態で上方に延出されており、さらに、その上端部は、若干後方に傾斜している。
角部４６は、その上部が前述した糸調子バネ４５のガイド部４５１の上方に位置している。そして、角部４６の上部には、糸挿通部としての第一の糸挿通孔４６１と糸挿通部としての第二の糸挿通孔４６２とが、上下に並んで、角部４６の前面から後面にかけて貫通形成されている。そして、糸調子バネ４５のガイド部４５１から引き出された下糸は、角部４６の第一及び第二の糸挿通孔４６１，４６２に通されてから針板の針穴に到る下糸の経路が形成される。 The corner portion 46 has a long plate shape, and extends upward in a state inclined somewhat to the right from the front upper portion of the cover 43, and further, its upper end portion is slightly inclined rearward.
The upper portion of the corner portion 46 is located above the guide portion 451 of the thread tension spring 45 described above. A first thread insertion hole 461 as a thread insertion section and a second thread insertion hole 462 as a thread insertion section are arranged vertically above the corner section 46, from the front surface to the rear surface of the corner section 46. It is formed through. The lower thread pulled out from the guide part 451 of the thread tension spring 45 is passed through the first and second thread insertion holes 461 and 462 of the corner part 46 and then reaches the needle hole of the needle plate. A path is formed.

上記第一及び第二の糸挿通孔４６１，４６２は、下糸の糸張力が小さくて良い場合には、第一の糸挿通孔４６１のみに下糸が挿通され、下糸の糸張力を大きくする必要がある場合には、第一及び第二の糸挿通孔４６１，４６２の両方に下糸が挿通される。
第一及び第二の糸挿通孔４６１，４６２の両方を使用する場合には、例えば、ガイド部４５１から引き出された下糸を角部４６の後面側から前面側に抜けるように第二の糸挿通孔４６２に通し、さらに、角部４６の側面から後面に引き回して、再び、角部４６の後面側から前面側に抜けるように第一の糸挿通孔４６１に通すことができる。
このような下糸の経路を形成した場合、下糸を、第二の糸挿通孔４６２と角部４６の前面との角（かど）、角部４６の前面と側面との角、角部４６の側面と後面との角、角部４６の後面と第一の糸挿通孔４６１との角からなる四つの角に摺接させて、その摺動摩擦により、糸調子バネ４５と同等或いはそれ以上の糸張力を付与することができる。 In the first and second thread insertion holes 461 and 462, when the thread tension of the lower thread may be small, the lower thread is inserted only into the first thread insertion hole 461 and the thread tension of the lower thread is increased. When it is necessary to do so, the lower thread is inserted into both the first and second thread insertion holes 461 and 462.
When both the first and second thread insertion holes 461 and 462 are used, for example, the second thread so that the lower thread pulled out from the guide part 451 is pulled out from the rear side of the corner part 46 to the front side. It can be passed through the insertion hole 462, further drawn from the side surface of the corner portion 46 to the rear surface, and again through the first yarn insertion hole 461 so as to come out from the rear surface side of the corner portion 46 to the front surface side.
When such a lower thread path is formed, the lower thread is divided into the corner (corner) between the second thread insertion hole 462 and the front surface of the corner portion 46, the corner between the front surface and the side surface of the corner portion 46, and the corner portion 46. Of the side surface and the rear surface of the thread, and the four corners formed by the corners of the rear surface of the corner portion 46 and the first thread insertion hole 461. Yarn tension can be applied.

なお、上記角を形成する角部４６の前面及び後面の外縁部と、第一の糸挿通孔４６１の前後の内縁部と、第二の糸挿通孔４６２の前後の内縁部とには、過剰な摺動摩擦が生じないように、面取り加工或いは丸み形状（アール形状）の加工が施されている。   It should be noted that the front and rear outer edge portions of the corner portion 46 forming the corner, the front and rear inner edge portions of the first thread insertion hole 461, and the front and rear inner edge portions of the second thread insertion hole 462 are excessive. A chamfering process or a rounded (R-shaped) process is performed so that no sliding friction is generated.

また、下糸を、第二の糸挿通孔４６２の前から後に向けて通してから第一の糸挿通孔４６２に等しても良い。
その場合、下糸を、角部４６の後面と側面との角、角部４６の側面と前面との角、角部４６の前面と第二の糸挿通孔４６２との角、第二の糸挿通孔４６２と角部４６の後面との角、角部４６の後面と第一の糸挿通孔４６１との角からなる五つの角に摺接させて、その摺動摩擦により、より大きな糸張力を付与することができる。
なお、第一の糸挿通孔４６１については、中釜押さえ３５の凹部３５２に周囲が囲まれるので、下糸を後から前に通すことが望ましい。 Alternatively, the lower thread may be passed through the second thread insertion hole 462 from the front to the rear and then the first thread insertion hole 462 or the like.
In that case, the lower thread may be the corner between the rear surface and the side surface of the corner portion 46, the corner between the side surface and the front surface of the corner portion 46, the corner between the front surface of the corner portion 46 and the second thread insertion hole 462, the second yarn. The sliding hole is slidably contacted with five corners formed by the corners of the insertion hole 462 and the corner 46, and the corner 46 and the first thread insertion hole 461. Can be granted.
The first thread insertion hole 461 is surrounded by the concave portion 352 of the inner hook presser 35, so it is desirable to pass the lower thread from the rear to the front.

［ボビンケースの作用効果］
上記ボビンケース４０を使用する場合には、下糸が巻かれたボビン３１をボビンケース４０の内側に格納する。その際、ボビン３１に巻かれた下糸の一端部を側壁部４２のスリット４２２から糸繰り出し穴４２１に引き込み、糸調子バネ４５と側壁部４２との間に下糸を介挿する。
そして、下糸の一端部を糸調子バネ４５のガイド部４５１から引き出して、さらに、角部４６の第二の糸挿通孔４６２の後端部から挿入し、さらに、角部４６の後側に回して第一の糸挿通孔４６１の後端部からもう一度挿入する。
その後、ボビンケース４０をボビン３１と共に中釜３３の内側に格納する。このとき、ボビン３１の円筒部に中釜３３の支軸３３２が挿入され、ボビンケース４０の角部４６は中釜押さえ３５の凹部３５２に嵌合させる。 [Function and effect of bobbin case]
When the bobbin case 40 is used, the bobbin 31 around which the lower thread is wound is stored inside the bobbin case 40. At that time, one end of the lower thread wound around the bobbin 31 is drawn into the thread feeding hole 421 from the slit 422 of the side wall part 42, and the lower thread is inserted between the thread tension spring 45 and the side wall part 42.
Then, one end portion of the lower thread is pulled out from the guide portion 451 of the thread tension spring 45 and further inserted from the rear end portion of the second thread insertion hole 462 of the corner portion 46, and further to the rear side of the corner portion 46. Turn and insert again from the rear end of the first thread insertion hole 461.
Thereafter, the bobbin case 40 is stored inside the inner hook 33 together with the bobbin 31. At this time, the support shaft 332 of the inner hook 33 is inserted into the cylindrical portion of the bobbin 31, and the corner portion 46 of the bobbin case 40 is fitted into the concave portion 352 of the inner hook retainer 35.

かかる状態で縫製を開始することにより、中釜３３の剣先３３４が先端側に向かう方向に回動することにより、剣先３３４に捕捉された上糸のループにボビンケース４０及びボビン３１をくぐらせることができ、上糸が天秤により引き上げられると、上糸のループが縮小しながら角部４６と凹部３５２との間を通過して針板上方に引き上げられて下糸と上糸とによる結節が形成される。   By starting the sewing in such a state, the sword tip 334 of the inner hook 33 is rotated in the direction toward the front end side, whereby the bobbin case 40 and the bobbin 31 are passed through the loop of the upper thread captured by the sword tip 334. When the upper thread is pulled up by the balance, the upper thread loop shrinks and passes between the corner 46 and the recess 352 and is pulled up above the needle plate to form a knot between the lower thread and the upper thread. Is done.

このように、ボビンケース４０の角部４６に下糸を挿通する第一と第二の糸挿通孔４６１，４６２を設けたので、これら双方に下糸を挿通させることにより、下糸がより多くの角に摺動することとなり、糸挿通孔が一つのみの場合に比べてより大きな糸張力を下糸に付与することが可能となる。
従って、より大きな糸張力を下糸に付与する必要がある場合に、糸調子バネ４５で強力に締め付ける必要がなくなり、当該締め付けによる糸の撚り戻しの発生を効果的に低減し、剣先の絡みを効果的に回避して、良好な縫製を行うことが可能となる。 As described above, since the first and second thread insertion holes 461 and 462 for inserting the lower thread are provided in the corner portion 46 of the bobbin case 40, the lower thread can be increased by inserting the lower thread in both of them. It is possible to apply a larger thread tension to the lower thread than when only one thread insertion hole is provided.
Accordingly, when it is necessary to apply a higher thread tension to the lower thread, it is not necessary to strongly tighten the thread tension spring 45, effectively reducing the occurrence of untwisting of the thread due to the tightening, and entanglement of the sword tip. It is possible to effectively avoid and perform good sewing.

また、第一及び第二の糸挿通孔４６１，４６２の前後の内縁部と角部４６の前面と後面の外縁部とに、面取り又は丸み形状が施されているので、それぞれの角で摺動する下糸に傷やけば立ち等の劣化の発生を抑制することができ、縫い品質の向上を図ることが可能となる。   Further, since the front and rear inner edge portions of the first and second thread insertion holes 461 and 462, the front surface of the corner portion 46, and the outer edge portion of the rear surface are chamfered or rounded, they slide at the respective corners. It is possible to suppress the occurrence of deterioration such as scratching or flaking on the lower thread, and to improve the sewing quality.

［ボビンケースの他の例(1)］
上記ボビンケース４０の角部４６とは異なる他の角部４６Ａを備えるボビンケース４０Ａについて図５に基づいて説明する。
このボビンケース４０Ａの角部４６Ａは、貫通孔である第一及び第二の糸挿通孔４６１，４６２に替えて、切り欠きからなる第一及び第二の糸挿通部４６１Ａ，４６２Ａが形成されている。
各糸挿通部４６１Ａ，４６２Ａは、いずれも角部４６Ａの右縁部から左方に向かってＵ字状に切り欠かれている。これにより、下糸は、角部４６Ａの後方から第二の糸挿通部４６２Ａの内側に挿通され、角部４６Ａの左縁部から後側に回して、後方から第一の糸挿通部４６１Ａの内側に挿通することにより、角部４６と同様に複数の角に下糸を摺動させて、より大きな糸張力を付与することができる。
なお、二つの糸挿通部のいずれか一方を貫通孔とし、他方を切り欠きとしても良い。 [Other examples of bobbin cases (1)]
A bobbin case 40A having another corner portion 46A different from the corner portion 46 of the bobbin case 40 will be described with reference to FIG.
The corner portion 46A of the bobbin case 40A has first and second thread insertion portions 461A and 462A formed of notches instead of the first and second thread insertion holes 461 and 462 which are through holes. Yes.
Each of the thread insertion portions 461A and 462A is cut out in a U shape from the right edge portion of the corner portion 46A toward the left. As a result, the lower thread is inserted into the second thread insertion part 462A from the rear of the corner part 46A, turned from the left edge of the corner part 46A to the rear side, and the first thread insertion part 461A from the rear side. By inserting the inner thread, the lower thread can be slid to a plurality of corners similarly to the corner portion 46, and a larger thread tension can be applied.
One of the two thread insertion portions may be a through hole and the other may be a notch.

［ボビンケースの他の例(2)］
上記ボビンケース４０の角部４６とは異なる他の角部４６Ｂを備えるボビンケース４０Ｂについて図６に基づいて説明する。
このボビンケース４０Ｂの角部４６Ｂは、第一及び第二の糸挿通孔４６１，４６２に加えて、第二の糸挿通孔４６２の下側にさらに第三の糸挿通孔４６３Ｂが形成されている。
この場合、まず、下糸は、第三の糸挿通孔４６３Ｂの後端部から前方に挿入され、次に、角部４６Ｂの後に回されて第二の糸挿通孔４６２の後端部から前方に挿入され、さらに、角部４６Ｂの後に回されて第一の糸挿通孔４６１の後端部から前方に挿入される。
これにより、角部４６より多くのと同様に複数の角に下糸を摺動させて、より大きな糸張力を付与することができる。
この場合も、必要とする糸張力の大きさに応じて下糸を通す糸挿通孔の数を増減させても良い。
なお、糸挿通孔の数は三つに限らず、より多く形成しても良い。また、それらの一部又は全部を貫通孔ではなく切り欠きとしても良い。 [Other examples of bobbin cases (2)]
A bobbin case 40B having another corner 46B different from the corner 46 of the bobbin case 40 will be described with reference to FIG.
In addition to the first and second thread insertion holes 461 and 462, the corner portion 46B of the bobbin case 40B is further formed with a third thread insertion hole 463B below the second thread insertion hole 462. .
In this case, first, the lower thread is inserted forward from the rear end portion of the third thread insertion hole 463B, and then is rotated after the corner portion 46B to forward from the rear end portion of the second thread insertion hole 462. Further, it is rotated after the corner portion 46B and inserted forward from the rear end portion of the first thread insertion hole 461.
As a result, the lower thread can be slid to a plurality of corners in the same manner as the corner portions 46, and a larger thread tension can be applied.
Also in this case, the number of thread insertion holes through which the lower thread is passed may be increased or decreased according to the required thread tension.
Note that the number of the thread insertion holes is not limited to three and may be formed more. Also, some or all of them may be cut out instead of through holes.

３０ 釜機構
３１ ボビン
３３ 中釜
３５ 中釜押さえ
３５２ 凹部
４０，４０Ａ，４０Ｂ ボビンケース
４２ 側壁部
４５ 糸調子バネ
４６，４６Ａ，４６Ｂ 角部（回り止め部）
４５２ 調節ネジ
４６１ 第一の糸挿通孔（糸挿通部）
４６２ 第二の糸挿通孔（糸挿通部）
４６１Ａ 第一の糸挿通部
４６２Ａ 第二の糸挿通部
４６３Ｂ 第三の糸挿通孔（糸挿通部） 30 Hook mechanism 31 Bobbin 33 Middle hook 35 Middle hook presser 352 Recess 40, 40A, 40B Bobbin case 42 Side wall part 45 Thread tension springs 46, 46A, 46B Corner part (anti-rotation part)
452 Adjustment screw 461 First thread insertion hole (thread insertion part)
462 Second thread insertion hole (thread insertion part)
461A First thread insertion part 462A Second thread insertion part 463B Third thread insertion hole (thread insertion part)

Claims (4)

下糸のボビンを内部に収容するミシンのボビンケースにおいて、
前記ボビンを囲繞する側壁部の半径方向外側に延出された回り止め部を備え、
前記回り止め部に下糸を挿通する糸挿通部を少なくとも二つ設けたことを特徴とするミシンのボビンケース。 In the bobbin case of the sewing machine that houses the bobbin of the lower thread inside,
A detent portion extending radially outward of the side wall surrounding the bobbin;
A bobbin case for a sewing machine, wherein at least two thread insertion portions for inserting a lower thread are provided in the anti-rotation portion. 少なくとも一つの前記糸挿通部は貫通孔であることを特徴とする請求項１記載のミシンのボビンケース。   The bobbin case for a sewing machine according to claim 1, wherein at least one of the thread insertion portions is a through hole. 少なくとも一つの前記糸挿通部は切り欠きであることを特徴とする請求項１又は２記載のミシンのボビンケース。   The bobbin case for a sewing machine according to claim 1 or 2, wherein at least one of the thread insertion portions is a notch. 前記糸挿通部の縁部に面取り又は丸み形状が施されていることを特徴とする請求項１から３のいずれか一項に記載のミシンのボビンケース。   The bobbin case for a sewing machine according to any one of claims 1 to 3, wherein an edge portion of the yarn insertion portion is chamfered or rounded.
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