JP2009213529A - Needle thread holding mechanism of sewing machine - Google Patents

Needle thread holding mechanism of sewing machine Download PDF

Info

Publication number
JP2009213529A
JP2009213529A JP2008057413A JP2008057413A JP2009213529A JP 2009213529 A JP2009213529 A JP 2009213529A JP 2008057413 A JP2008057413 A JP 2008057413A JP 2008057413 A JP2008057413 A JP 2008057413A JP 2009213529 A JP2009213529 A JP 2009213529A
Authority
JP
Japan
Prior art keywords
thread
thread holding
sewing machine
needle
holding member
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2008057413A
Other languages
Japanese (ja)
Inventor
Motonari Nakano
元就 中野
Takeo Wataya
竹男 綿谷
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Brother Industries Ltd
Original Assignee
Brother Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Brother Industries Ltd filed Critical Brother Industries Ltd
Priority to JP2008057413A priority Critical patent/JP2009213529A/en
Priority to CN2009100087659A priority patent/CN101525822B/en
Publication of JP2009213529A publication Critical patent/JP2009213529A/en
Pending legal-status Critical Current

Links

Images

Landscapes

  • Sewing Machines And Sewing (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a needle thread holding mechanism of a sewing machine which is capable of suppressing the generation of wrinkles of a workpiece and the winding of a thread end into a needle thread loop while preventing thread falling by turning the holding force of needle thread in the initial period of sewing to an appropriate value. <P>SOLUTION: The needle thread holding mechanism of the sewing machine includes a first thread holding plate 21 provided on the lower surface of a needle plate 12 and a second thread holding plate 22 provided with a thread hole 22b where a sewing needle 11 which has passed through a needle hole 12a is to pass through and provided relatively movably to the first thread holding plate 21 below the first thread holding plate 21. As sewing is started, the second thread holding plate 22 is moved to a thread capturing position such that the sewing needle 11 passes through the thread hole 22b and is moved relatively to the first thread holding plate 21 after the sewing needle 11 is detached from the thread hole 22b, a bent thread passing resistance imparting part S is formed, and the thread end of the needle thread 7 extending downward from the eye hole 11a of the sewing needle 11 is inserted to the thread passing resistance imparting part S and held. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、縫製開始時の数針分の縫目形成に際し、上糸の端部を保持するミシンの上糸保持機構に関する。   The present invention relates to an upper thread holding mechanism for a sewing machine that holds an end portion of an upper thread when forming stitches for several stitches at the start of sewing.

従来、閂止め縫目を形成する閂止めミシン等、各種のミシンにおいては、縫製開始時に、加工布や上糸の種類によっては、天秤の上昇により上糸が縫針の目穴から抜けてしまい、縫目が形成できない場合がある。そこで、縫製開始に際して、縫針が最上位置から針穴を通過して下降し、次の上昇移動の途中で針板の上側に移動したときに、針板の下側に残っている上糸の糸端部を、数針分の縫目が形成されるまで挟持しておくようにして、縫製開始時における糸抜けや目飛びを防止するようにしたミシンの上糸保持機構が各種提案されている。   Conventionally, in various types of sewing machines such as a bar-tacking machine that forms a bar-tacking seam, at the start of sewing, depending on the type of work cloth and upper thread, the upper thread may come off from the eye of the sewing needle due to the lifting of the balance, Seams may not be formed. Therefore, at the start of sewing, when the sewing needle descends through the needle hole from the uppermost position and moves to the upper side of the needle plate during the next ascending movement, the thread of the upper thread remaining on the lower side of the needle plate Various types of upper thread holding mechanisms have been proposed in which the end is held until several stitches are formed so as to prevent thread dropout and stitch skipping at the start of sewing. .

例えば、特許文献１に記載のミシンの上糸保持機構は、縫製開始に際して挟持手段がその貫通孔を針穴と合致する「初期位置」に移動し、第１針目の縫針が針板の上側に移動したときに、挟持手段が「初期位置」から「挟持位置」に移動して糸端部を挟持し、所定針数（例えば、２〜３針）分の縫製が実行されたときに、挟持手段が「挟持位置」から「開放位置」に移動して、糸端部の挟持を解除するようになっている。
特開２００３−２９９８９４号公報 For example, in the upper thread holding mechanism of the sewing machine described in Patent Document 1, when the sewing is started, the clamping means moves to the “initial position” where the through hole matches the needle hole, and the sewing needle of the first stitch is located above the needle plate. When moved, the clamping means moves from the “initial position” to the “clamping position”, clamps the thread end, and is clamped when a predetermined number of stitches (for example, 2 to 3 stitches) are sewn. The means moves from the “clamping position” to the “opening position” to release the pinching of the yarn end.
JP 2003-299894 A

前述した従来技術のミシンの上糸保持機構においては、糸端を糸端が抜け落ちないように強固な力で狭持するため、縫製開始から所定針数分の被縫製物の送り量によっては被縫製物にしわが発生するおそれがある。また最初に保持した糸端部の長さがやや長すぎた場合には、その後の天秤の上糸の引き上げや生地送りにともなう上糸の送り出しにより上糸が消費されないため、上糸の糸端部が次に形成される上糸ループに巻き込まれてしまうおそれがあった。   In the above-described conventional needle thread holding mechanism of the sewing machine, since the thread end is held with a strong force so that the thread end does not fall off, depending on the feed amount of the sewing product for a predetermined number of stitches from the start of sewing, There is a risk of wrinkling of the sewn product. In addition, if the length of the yarn end held first is slightly too long, the upper yarn will not be consumed by the upper yarn being pulled up and the upper yarn being sent out when the fabric is fed. There is a possibility that the portion is caught in the upper thread loop to be formed next.

本発明の目的は、縫製初期における上糸の保持力を適正な値とすることで、糸抜けを防止しつつ被縫製物のしわの発生や糸端部の上糸ループへの巻き込みを抑制できるミシンの上糸保持機構を提供することにある。   An object of the present invention is to set the holding force of an upper thread in an initial stage of sewing to an appropriate value, thereby preventing wrinkles of a sewing object and entanglement of the thread end portion in an upper thread loop while preventing thread dropout. The object is to provide an upper thread holding mechanism of a sewing machine.

上記目的を達成するために、第１発明のミシンの上糸保持機構は、針孔を備えベッド部に設けた針板と、上糸を担持する目孔を備え上下動する縫針とを有するミシンにおいて、前記針板の下面に設けた第１糸保持部材と、前記針孔を貫通した前記縫針が通過する糸孔を備え、前記第１糸保持部材の下方において、前記第１糸保持部材に対して相対移動可能に設けた第２糸保持部材とを有し、縫製開始にともない、縫針が前記糸孔を貫通するように第２糸保持部材を糸捕捉位置に移動し、縫針が前記糸孔から離脱した後に第１糸保持部材に対して相対移動して、屈曲状の糸通過抵抗付与部を形成し、縫針の目孔から下方に延びる上糸の糸端を前記糸通過抵抗付与部に挿通保持したことを特徴とする。   In order to achieve the above object, an upper thread holding mechanism of a sewing machine according to a first aspect of the present invention is a sewing machine having a needle plate provided with a needle hole and provided in a bed portion, and a sewing needle having an eye hole carrying an upper thread and moving up and down. A first thread holding member provided on a lower surface of the needle plate, and a thread hole through which the sewing needle that passes through the needle hole passes, wherein the first thread retaining member is provided below the first thread retaining member. And a second thread holding member provided so as to be relatively movable, and at the start of sewing, the second thread holding member is moved to the thread catching position so that the sewing needle penetrates the thread hole, and the sewing needle is moved to the thread After moving away from the hole, it moves relative to the first thread holding member to form a bent thread passing resistance applying portion, and the thread end of the upper thread extending downward from the eye hole of the sewing needle is connected to the thread passing resistance applying portion. It is characterized in that it is inserted and held.

本願第１発明のミシンの上糸保持機構は、第１糸保持部材と第２糸保持部材とを有する。第１糸保持部材はミシンの針板の下面に設けており、第２糸保持部材は第１糸保持部材の下方に設けている。第２糸保持部材は糸孔を備えている。縫製開始時に縫針の上下動により縫針の目孔が担持した上糸は、針板の針孔から下方に垂下する。上糸の糸端部は、第１糸保持部材と第２糸保持部材との間の糸通過抵抗付与部で屈曲した後、第２糸保持部材の糸孔を通過する。糸通過抵抗付与部は、糸端の通路が屈曲したものとなっている。縫製開始時に糸端が屈曲通路から外に引っ張られるが糸端に抵抗がかかるので、１針目から糸端が糸通過抵抗付与部から抜け落ちてしまうことがない。縫製が進行していくと、上糸の糸端は被縫製物に引っ張られて糸通過抵抗付与部から抜けていく。   The upper thread holding mechanism of the sewing machine according to the first invention of the present application includes a first thread holding member and a second thread holding member. The first thread holding member is provided on the lower surface of the needle plate of the sewing machine, and the second thread holding member is provided below the first thread holding member. The second thread holding member has a thread hole. The upper thread carried by the stitch hole of the sewing needle by the vertical movement of the sewing needle at the start of sewing hangs downward from the needle hole of the needle plate. The yarn end portion of the upper yarn is bent at the yarn passing resistance applying portion between the first yarn holding member and the second yarn holding member, and then passes through the yarn hole of the second yarn holding member. The yarn passage resistance applying portion has a bent yarn end passage. At the start of sewing, the thread end is pulled out of the bent passage, but resistance is applied to the thread end, so that the thread end does not fall out of the thread passing resistance applying portion from the first stitch. As the sewing progresses, the thread end of the upper thread is pulled by the workpiece and comes out of the thread passage resistance applying portion.

本願第１発明は、第１糸保持部材と第２糸保持部材とで糸端を離脱不能に狭持する上糸掴み機構ではなく、糸端の通路を屈曲して糸端の通過抵抗を付与して上糸を保持する上糸保持機構である。これにより、上糸の保持力を、強すぎることなく弱すぎることのない、適正な値とすることができる。   The first invention of this application is not an upper thread gripping mechanism in which the first thread holding member and the second thread holding member nip the thread end so that it cannot be detached, but the thread end passage is bent to give the thread end passage resistance. Thus, the upper thread holding mechanism holds the upper thread. Thereby, the holding force of the upper thread can be set to an appropriate value that is neither too strong nor too weak.

したがって、被縫製物への縫目形成数が比較的少ない縫製の初期において、糸通過抵抗付与部から上糸が抜けない程度に上糸を保持しつつ、ミシンの送り機構が被縫製物を１針毎に送った量に応じて上糸を被縫製物側に徐々に送り出すことができる。この結果、上糸掴み機構の強固な掴み力で上糸を掴んだままミシンの送り機構が被縫製物を送ることで発生する、被縫製物のしわを防止することができる。また、最初に保持した糸端部の長さがやや長すぎたとしても、その後の天秤の上糸の引き上げや生地送りにともなう上糸の送り出しにより保持する糸端部の長さを徐々に短くすることができる。上糸のループに下糸ボビンがくぐり抜ける際に、上糸の糸端部が上糸ループに巻き込まれてしまうことを抑制することができる。   Accordingly, in the initial stage of sewing where the number of stitches formed on the sewing product is relatively small, the sewing machine feed mechanism 1 holds the sewing product while holding the upper thread to such an extent that the upper thread does not come off from the thread passage resistance applying portion. The upper thread can be gradually sent to the sewing product side in accordance with the amount sent for each needle. As a result, it is possible to prevent wrinkles of the sewing product that occur when the sewing machine feed mechanism feeds the sewing product while holding the upper thread with the strong gripping force of the upper thread gripping mechanism. Also, even if the length of the yarn end held first is slightly too long, the length of the yarn end held by gradually lifting the upper thread of the balance or feeding the upper thread accompanying the feeding of the fabric is gradually shortened. can do. When the lower thread bobbin passes through the upper thread loop, it is possible to prevent the end portion of the upper thread from being caught in the upper thread loop.

第２発明のミシンの上糸保持機構は、上記第１発明において、前記糸通過抵抗付与部は、前記第１糸保持部材の下面と前記第２糸保持部材の上面との間に設けた所定の上下方向寸法の間隙と、前記第１糸保持部材の側面と前記第２糸保持部材の側面との間に設けた前記相対移動方向寸法の間隙との少なくともいずれか一方を備えたことを特徴とする。   The upper thread holding mechanism of the sewing machine according to a second aspect of the present invention is the sewing machine according to the first aspect, wherein the thread passage resistance applying portion is provided between the lower surface of the first thread holding member and the upper surface of the second thread holding member. At least one of a gap in the vertical direction dimension and a gap in the relative movement direction dimension provided between a side surface of the first yarn holding member and a side surface of the second yarn holding member. And

本願第２発明のミシンの上糸保持機構では、第１糸保持部材と第２糸保持部材とで上糸を狭持するのではなく、第１糸保持部材と第２糸保持部材との間に隙間を設け、且つ上糸を屈曲させることで糸通過抵抗を付与し上糸を保持する。これにより、上糸の保持力を、強すぎることなく弱すぎることのない、適正な値とすることができる。   In the upper thread holding mechanism of the sewing machine according to the second invention of the present application, the upper thread is not held between the first thread holding member and the second thread holding member, but between the first thread holding member and the second thread holding member. The upper thread is held by providing a gap and providing the thread passing resistance by bending the upper thread. Thereby, the holding force of the upper thread can be set to an appropriate value that is neither too strong nor too weak.

第３発明のミシンの上糸保持機構は、上記第２発明において、前記上下方向寸法の間隙を与えるスペーサ部材を、前記第１糸保持部材と前記第２糸保持部材との間に設けたことを特徴とする。   The upper thread holding mechanism of the sewing machine according to a third aspect of the present invention is the sewing machine according to the second aspect, wherein a spacer member that provides the gap in the vertical direction is provided between the first thread holding member and the second thread holding member. It is characterized by.

本願第３発明のミシンの上糸保持機構では、第１糸保持部材と第２糸保持部材との間にスペーサ部材を設ける。これにより、糸通過抵抗を付与するために必要な第１糸保持部材と第２糸保持部材との間の間隙を、確実に形成することができる。   In the upper thread holding mechanism of the sewing machine according to the third aspect of the present invention, a spacer member is provided between the first thread holding member and the second thread holding member. Thereby, it is possible to reliably form a gap between the first yarn holding member and the second yarn holding member necessary for providing the yarn passage resistance.

第４発明のミシンの上糸保持機構は、上記第２又は第３発明において、前記糸通過抵抗付与部は、前記第１糸保持部材の下面に、前記目孔から下方に延びる前記上糸を受け入れる凹部を設けたことを特徴とする。   An upper thread holding mechanism of a sewing machine according to a fourth aspect of the present invention is the sewing machine according to the second or third aspect, wherein the thread passage resistance applying portion is provided on the lower surface of the first thread holding member. It is characterized in that a recess for receiving is provided.

本願第４発明のミシンの上糸保持機構では、第１糸保持部材の下面に凹部を設ける。これにより、第１糸保持部材と第２糸保持部材との間の間隙において上糸を屈曲させて通過させるとき、第１糸保持部材の凹部と第２糸保持部材との間を上糸が確実に通過するように上糸を受け入れて上糸の通過抵抗を確実に適正な値とすることができる。   In the upper thread holding mechanism of the sewing machine according to the fourth aspect of the present invention, a recess is provided on the lower surface of the first thread holding member. Thus, when the upper thread is bent and passed through the gap between the first thread holding member and the second thread holding member, the upper thread is interposed between the recess of the first thread holding member and the second thread holding member. It is possible to receive the upper thread so as to surely pass and reliably set the upper thread passage resistance to an appropriate value.

第５発明のミシンの上糸保持機構は、上記第４発明において、前記針板に対し軸部材を介して前記第２糸保持部材を水平方向に回動可能に支持したことを特徴とする。   The upper thread holding mechanism of the sewing machine according to a fifth aspect of the present invention is characterized in that, in the fourth aspect of the invention, the second thread holding member is rotatably supported in the horizontal direction with respect to the needle plate via a shaft member.

本願第５発明のミシンの上糸保持機構では、軸部材を介し、第２糸保持部材を回動可能に支持する。上糸を糸孔に通過させる位置と上糸を保持する位置との間の切り替えを、水平方向の回転運動で行うことが可能になる。第２糸保持部材の位置の切り替えを直線的なスライド運動で行う場合よりも、第２糸保持部材の針板への支持構造を簡素化することができる。   In the upper thread holding mechanism of the sewing machine according to the fifth aspect of the present invention, the second thread holding member is rotatably supported via the shaft member. Switching between the position where the upper thread is passed through the thread hole and the position where the upper thread is held can be performed by a horizontal rotational movement. The support structure for the needle plate of the second thread holding member can be simplified as compared with the case where the position of the second thread holding member is switched by a linear slide motion.

第６発明のミシンの上糸保持機構は、上記第５発明において、前記第２糸保持部材を、前記糸孔と前記針孔との水平方向位置が一致し、前記上糸を前記糸孔に通過させる開始位置と、上面が前記第１糸保持部材の前記凹部に対向し、前記糸孔を通過した状態の前記上糸を前記凹部に受け入れて前記上糸を保持する保持位置との間で回動可能に構成したことを特徴とする。   The upper thread holding mechanism of a sewing machine according to a sixth aspect of the present invention is the sewing machine according to the fifth aspect, wherein the second thread holding member is aligned with a horizontal position of the thread hole and the needle hole, and the upper thread is used as the thread hole. Between the starting position to pass through and the holding position where the upper surface is opposed to the concave portion of the first yarn holding member and the upper yarn in the state of passing through the yarn hole is received in the concave portion and holds the upper yarn. It is configured to be rotatable.

本願第６発明のミシンの上糸保持機構では、開始位置と保持位置との間で第２糸保持部材が回動する。これにより、開始位置で上糸を糸孔に通過させた後、回動して保持位置に切り替え、その保持位置で上糸を凹部に受け入れて保持することができる。   In the upper thread holding mechanism of the sewing machine according to the sixth aspect of the present invention, the second thread holding member rotates between the start position and the holding position. Thereby, after passing the upper thread through the thread hole at the start position, the upper thread can be rotated and switched to the holding position, and the upper thread can be received and held in the recess at the holding position.

第７発明のミシンの上糸保持機構は、上記第５又は第６発明において、前記第２糸保持部材は、回動用の駆動力を伝達するリンク機構を作動連結するリンク連結部を備えることを特徴とする。   An upper thread holding mechanism of a sewing machine according to a seventh aspect of the present invention is the above fifth or sixth aspect, wherein the second thread holding member includes a link connecting portion that operatively connects a link mechanism that transmits a driving force for rotation. Features.

本願第７発明のミシンの上糸保持機構では、第２糸保持部材にリンク連結部を設けている。これにより、リンク機構からの駆動力をリンク連結部に伝達することで、第２糸保持部材を回動させることができる。   In the upper thread holding mechanism of the sewing machine according to the seventh invention of the present application, the second thread holding member is provided with a link connecting portion. Thereby, the 2nd thread | yarn holding member can be rotated by transmitting the driving force from a link mechanism to a link connection part.

第８発明のミシンの上糸保持機構は、上記第７発明において、前記第１糸保持部材を、前記第２糸保持部材と共通の前記軸部材を介し、前記針板に平行な方向に回動可能に支持し、第２糸保持部材とともに前記糸通過抵抗付与部を構成する保持位置と、その糸通過抵抗付与部を構成したまま第２糸保持部材とともに回動して前記保持位置よりも針孔から離れた退避位置へ移動可能にしたことを特徴とする。   An upper thread holding mechanism of a sewing machine according to an eighth aspect of the present invention is the sewing machine according to the seventh aspect, wherein the first thread holding member is rotated in a direction parallel to the needle plate via the shaft member common to the second thread holding member. A holding position that supports the movement and constitutes the yarn passing resistance applying portion together with the second yarn holding member, and rotates together with the second yarn holding member while forming the yarn passing resistance applying portion. It is possible to move to a retreat position away from the needle hole.

本願第８発明のミシンの上糸保持機構では、軸部材を介し、第１糸保持部材を保持位置と退避位置との間で回動可能に支持する。これにより、保持位置に配置した第１糸保持部材に対して第２糸保持部材を相対移動させて、上糸通過抵抗付与部を構成できる。その後、第１糸保持部材と第２糸保持部材との相対位置関係を維持したまま上糸通過抵抗付与部を針孔よりも離れた退避位置へ移動できる。また、上糸保持のための上糸通過抵抗を維持したまま退避する退避位置への移動を回動運動で行うことが可能になる。縫製開始後の１針目の糸端を前記保持位置で上糸に通過抵抗を付与しつつ保持し、適宜針数縫製後に積極的に退避位置に移動させることにより糸端の糸通過抵抗付与部からの離脱を促進することができる。位置の切り替えを直線的なスライド運動で行う場合よりも、第１糸保持部材及び第２糸保持部材の針板への支持構造を簡素化することができる。第１糸保持部材を第２糸保持部材と共通の軸部材で支持することにより、部材数を減らすことができるとともに、互いに回動中心を一致させ、回動駆動のために必要な周囲の構成を簡素化することができる。   In the upper thread holding mechanism of the sewing machine according to the eighth aspect of the present invention, the first thread holding member is rotatably supported between the holding position and the retracted position via the shaft member. Accordingly, the upper thread passage resistance applying portion can be configured by moving the second thread holding member relative to the first thread holding member arranged at the holding position. Thereafter, the upper thread passage resistance applying portion can be moved to the retracted position away from the needle hole while maintaining the relative positional relationship between the first thread holding member and the second thread holding member. Further, it is possible to move to the retreat position where the upper thread passage resistance for retaining the upper thread is maintained while the upper thread passing resistance is maintained by a rotational movement. The thread end of the first needle after the start of sewing is held while giving a passage resistance to the upper thread at the holding position, and is appropriately moved to the retracted position after sewing the appropriate number of stitches from the thread passage resistance applying portion at the thread end. The withdrawal of can be promoted. The support structure of the first thread holding member and the second thread holding member to the needle plate can be simplified as compared with the case where the position is switched by a linear slide motion. By supporting the first thread holding member with the shaft member common to the second thread holding member, it is possible to reduce the number of members and to make the rotation centers coincide with each other, and the surrounding configuration necessary for rotational driving Can be simplified.

第９発明のミシンの上糸保持機構は、上記第８発明において、前記第１糸保持部材を、前記凹部が前記第２糸保持部材の上面と対向し、前記糸孔を通過した状態の前記上糸を前記凹部に受け入れて前記上糸を保持する前記保持位置と、前記糸端部を保持するための糸通過抵抗を維持した状態で退避する前記退避位置との間で回動可能に構成したことを特徴とする。   An upper thread holding mechanism of a sewing machine according to a ninth aspect of the invention is the sewing machine according to the eighth aspect, wherein the first thread holding member is in a state where the concave portion faces the upper surface of the second thread holding member and passes through the thread hole. It is configured to be rotatable between the holding position for receiving the upper thread in the recess and holding the upper thread, and the retracted position for retracting while maintaining the thread passage resistance for holding the thread end. It is characterized by that.

本願第９発明のミシンの上糸保持機構では、保持位置と退避位置との間で第１糸保持部材が回動する。これにより、保持位置で上糸を第２糸保持部材と凹部との間に受け入れて保持し第１糸保持部材の凹部と第２糸保持部材との間を第１針目から糸端の抜け落ちを防止しつつ糸端が確実に上糸通過抵抗付与部を通過するようになる。その後、退避位置に回動して、糸通過抵抗付与部からの糸端部の離脱を促進できる。   In the upper thread holding mechanism of the sewing machine according to the ninth aspect of the present invention, the first thread holding member rotates between the holding position and the retracted position. As a result, the upper thread is received and held between the second thread holding member and the recess at the holding position, and the thread end is removed from the first stitch between the recess of the first thread holding member and the second thread holding member. The yarn end surely passes through the upper yarn passage resistance applying portion while preventing. Thereafter, it can be rotated to the retracted position, and the detachment of the yarn end portion from the yarn passage resistance applying portion can be promoted.

第１０発明のミシンの上糸保持機構は、上記第９発明において、前記第２糸保持部材を、前記開始位置と、前記保持位置と、前記退避位置との間で回動可能に構成し、前記第１糸保持部材を前記第２糸保持部材と連動して前記保持位置から前記退避位置へ回動させるための連動部材を、前記第２糸保持部材に設けたことを特徴とする。   The upper thread holding mechanism of the sewing machine according to a tenth aspect of the present invention is the above ninth aspect, wherein the second thread holding member is configured to be rotatable between the start position, the holding position, and the retracted position, An interlocking member for rotating the first thread holding member from the holding position to the retracted position in conjunction with the second thread holding member is provided on the second thread holding member.

本願第１０発明のミシンの上糸保持機構では、第２糸保持部材に連動部材を設け、開始位置、保持位置、退避位置の間で回動可能とする。これにより、第２糸保持部材を駆動し保持位置から退避位置へ回動させるとき、連動して第１保持部材も退避位置へと回動させることができる。また、下糸が針板の上部に出た状態となっていた場合、第１糸保持部材と第２糸保持部材とが連動して退避位置へ回動した後に開始位置に戻るときに、下糸を押し出すことで針板の下部に戻すことも可能である。   In the upper thread holding mechanism of the sewing machine according to the tenth invention of the present application, the second thread holding member is provided with an interlocking member, and is rotatable between the start position, the holding position, and the retracted position. As a result, when the second thread holding member is driven and rotated from the holding position to the retracted position, the first holding member can also be rotated to the retracted position. In addition, when the lower thread has come out on the upper part of the needle plate, when the first thread holding member and the second thread holding member are rotated to the retracted position in conjunction with each other, It is also possible to return to the lower part of the needle plate by pushing out the thread.

第１１発明のミシンの上糸保持機構は、上記第５乃至第７発明のいずれかにおいて、前記第２糸保持部材の前記保持位置を、前記糸孔が前記ミシンの釜糸案内部材に設けた下糸引き出し用の開口部の周囲の上方に位置するように、前記第２糸保持部材を前記針板に支持したことを特徴とする。   An upper thread holding mechanism of a sewing machine according to an eleventh aspect of the invention is the sewing machine according to any one of the fifth to seventh aspects, wherein the holding position of the second thread holding member is provided in the hook thread guide member of the sewing machine. The second thread holding member is supported by the throat plate so as to be positioned above the periphery of the lower thread drawing opening.

一般に、ミシンの針板の下部には釜糸案内部材を設けており、釜糸案内部材には下糸を上方に引き出すための下糸引き出し用の開口部を設けている。本願第１１発明のミシンの上糸保持機構では、上糸を糸孔に通過させる第２糸保持部材を針板に対し回動可能に支持する。第２糸保持部材が保持位置にあるときには、上糸の先端が、釜糸案内部材の下糸引き出し用の開口部の上部ではなく、釜糸案内部材の下糸引き出し用の開口部の周囲の上部に位置している。これにより、上糸の先端が、下糸引き出し用の開口部から釜の内部に入り込み下糸あるいは釜をくぐりぬけた上糸と絡まるのを確実に防止することができる。   In general, a hook thread guide member is provided at the lower part of the needle plate of the sewing machine, and the hook thread guide member is provided with an opening for pulling out the lower thread for pulling the lower thread upward. In the upper thread holding mechanism of the sewing machine according to the eleventh aspect of the present invention, the second thread holding member that allows the upper thread to pass through the thread hole is rotatably supported with respect to the needle plate. When the second thread holding member is in the holding position, the tip of the upper thread is not on the upper part of the lower thread drawing opening of the hook thread guiding member, but around the lower thread pulling opening of the hook thread guiding member. Located at the top. As a result, it is possible to reliably prevent the tip of the upper thread from entering the inside of the hook through the lower thread drawing opening and entangled with the lower thread or the upper thread that has passed through the hook.

本発明によれば、縫製初期における上糸の保持力を適正な値とすることで、糸抜けを防止しつつ被縫製物のしわの発生や糸端部の上糸ループへの巻き込みを抑制することができる。   According to the present invention, the holding force of the upper thread at the initial stage of sewing is set to an appropriate value, so that the occurrence of wrinkles of the sewing object and the entanglement of the thread end in the upper thread loop is suppressed while preventing the thread from coming off. be able to.

以下、本発明の一実施の形態を図面を参照しつつ説明する。   Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

図１に示すように、作業テーブル８はその上に電子閂止めミシン１を載置している。電子閂止めミシン１（ミシン）は、ベッド部２と、ベッド部２の後端部から上方に立設する脚柱部５と、脚柱部５の上端部からベッド部２と対向するように前方へ延びるアーム部６等を有している。   As shown in FIG. 1, the work table 8 has the electronic tacking sewing machine 1 mounted thereon. An electronic barbed sewing machine 1 (sewing machine) has a bed part 2, a leg column part 5 standing upward from a rear end part of the bed part 2, and a bed part 2 from the upper end part of the leg column part 5. It has an arm portion 6 and the like extending forward.

脚柱部５及びアーム部６は、針棒１０を介して縫針１１を上下駆動するためのミシンモータ（図示略）、ミシンモータの駆動力を主軸を介して縫針１１に伝達する駆動力伝達機構（図示略）、布押え１３を布押え機構（図示略）を介して上下動させる押え駆動機構（図示略）等を内部に有する。またアーム部６は、その内部の前端部に、針棒１０を上下動させる針棒上下動機構（図示略）、上糸を引き上げる天秤を駆動する天秤駆動機構（図示略）等を有している。   The columnar part 5 and the arm part 6 are a sewing machine motor (not shown) for driving the sewing needle 11 up and down via the needle bar 10, and a driving force transmission mechanism for transmitting the driving force of the sewing motor to the sewing needle 11 via the main shaft. (Not shown), and a presser drive mechanism (not shown) that moves the presser foot 13 up and down via a presser foot mechanism (not shown). The arm portion 6 has a needle bar up / down moving mechanism (not shown) for moving the needle bar 10 up and down, a balance driving mechanism (not shown) for driving a balance for pulling up the upper thread, and the like at the front end of the arm 6. Yes.

ベッド部２は、脚柱部５を立設するベッド本体部３と、ベッド本体部３から前方に延びるシリンダヘッド部４とを有しており、シリンダヘッド部４の上面に、針孔１２ａ（図３等参照）を有する針板１２を着脱可能に固定している。   The bed portion 2 includes a bed main body portion 3 that erects the pedestal column portion 5 and a cylinder head portion 4 that extends forward from the bed main body portion 3. A needle hole 12 a ( A throat plate 12 having a structure (see FIG. 3 etc.) is detachably fixed.

ベッド部２は、布押え１３を有する布押え機構（図示略）と、針板１２及び送り板１４を前後方向（Ｙ方向）及び左右方向（Ｘ方向）に移動させる布送り機構（図示略）に加えて、縫針１１の上下動と調時して縫目を形成する垂直釜１５と、半回転駆動力を垂直釜１５に伝達する下軸１６と、後述する上糸保持機構２０と、縫製終了時に上糸と下糸を切断する糸切り機構（図示略）等を内部に有している。   The bed 2 includes a presser foot mechanism (not shown) having a presser foot 13, and a cloth feed mechanism (not shown) that moves the needle plate 12 and the feed plate 14 in the front-rear direction (Y direction) and the left-right direction (X direction). In addition, a vertical hook 15 that forms a seam in time with the vertical movement of the sewing needle 11, a lower shaft 16 that transmits a half-rotation driving force to the vertical hook 15, an upper thread holding mechanism 20 described later, and sewing A thread trimming mechanism (not shown) that cuts the upper thread and the lower thread at the end is provided inside.

垂直釜１５は、ミシンフレームに取り付けた大釜体１５ａと、大釜体１５ａが回転可能に枢支する中釜１５ｂ及びドライバ１５ｃ等を有している。下軸１６がドライバ１５ｃを半回転駆動する。中釜１５ｂはボビンケース１７を収納すると共に、剣先１５ｄを有している（図６参照）。   The vertical hook 15 includes a large hook body 15a attached to the sewing machine frame, an intermediate hook 15b on which the large hook body 15a is rotatably supported, a driver 15c, and the like. The lower shaft 16 drives the driver 15c by half rotation. The inner hook 15b accommodates the bobbin case 17 and has a sword tip 15d (see FIG. 6).

次に、ベッド部２内に設けた上糸保持機構２０について説明する。   Next, the upper thread holding mechanism 20 provided in the bed part 2 will be described.

図２に示すように、上糸保持機構２０は、針板１２の下面に設けた第１糸保持板２１（第１糸保持部材）と、第１糸保持板２１のさらに下方において、第１糸保持板２１に対し相対移動可能に設けた第２糸保持板２２（第２糸保持部材）と、これら第１及び第２糸保持板２１，２２を回動駆動するための回動駆動機構３５等を有する。   As shown in FIG. 2, the upper thread holding mechanism 20 includes a first thread holding plate 21 (first thread holding member) provided on the lower surface of the needle plate 12 and a first thread holding plate 21 further below the first thread holding plate 21. A second thread holding plate 22 (second thread holding member) provided so as to be relatively movable with respect to the thread holding plate 21 and a rotation driving mechanism for rotating the first and second thread holding plates 21 and 22. 35 etc.

針板１２の下面における針孔１２ａ（図３等参照）よりも後方位置において、枢支ピン２４（軸部材）が、第１糸保持板２１及び第２糸保持板２２を針板１２と平行な方向に回動可能に支持している。枢支ピン２４には、図３に示すように、第１糸保持板２１の下面と第２糸保持板２２の上面との間に所定の上下方向寸法の間隙（例えば０．２ｍｍ程度）を与えるためのスペーサ部材１８を設けている。   At a position behind the needle hole 12a (see FIG. 3 etc.) on the lower surface of the needle plate 12, the pivot pin 24 (shaft member) causes the first thread holding plate 21 and the second thread holding plate 22 to be parallel to the needle plate 12. It is supported so that it can rotate in any direction. As shown in FIG. 3, the pivot pin 24 has a predetermined vertical dimension gap (for example, about 0.2 mm) between the lower surface of the first thread holding plate 21 and the upper surface of the second thread holding plate 22. A spacer member 18 is provided.

第１糸保持板２１は、前方に突出して設けた保持腕部２１ａの前端部に貫通孔２１ｂを有しており、縫針１１の目孔１１ａ（図４参照）から下方に延びる上糸７を受け入れることが可能である。また第１糸保持板２１は、左方に突出して設けたバネ受け部２１ｃを有しており、このバネ受け部２１ｃの先端部と針板１２の下面の後端部に固着したバネ係止板２５とを、引っ張りコイルバネ２６が掛装している。引っ張りコイルバネ２６は、第１糸保持板２１を平面視（図５、図７、図９参照）にて反時計回りの方向に弾性付勢する。第１糸保持板２１の後端部に突出して設けたストッパ部２１ｄがバネ係止板２５に当接し、第１糸保持板２１を図５に示す係止位置に係止する。   The first thread holding plate 21 has a through hole 21b at a front end portion of a holding arm part 21a provided to protrude forward, and an upper thread 7 extending downward from the eye hole 11a (see FIG. 4) of the sewing needle 11 is provided. It is possible to accept. Further, the first thread holding plate 21 has a spring receiving portion 21c provided so as to protrude to the left, and the spring locking portion fixed to the distal end portion of the spring receiving portion 21c and the rear end portion of the lower surface of the needle plate 12. A tension coil spring 26 is hooked on the plate 25. The tension coil spring 26 elastically biases the first thread holding plate 21 counterclockwise in plan view (see FIGS. 5, 7, and 9). A stopper portion 21d provided protruding from the rear end portion of the first thread holding plate 21 abuts on the spring locking plate 25 and locks the first thread holding plate 21 at the locking position shown in FIG.

第２糸保持板２２は、前方に突出して設けた保持腕部２２ａの前端部に、針板１２の針孔１２ａを貫通した縫針１１が通過する糸孔２２ｂを有している。また第２糸保持板２２は、後端部に左方に突出するように設けた連結腕部２２ｃを有している。この連結腕部２２ｃに形成した係合孔２２ｄ（リンク連結部。図５参照）に、連結腕部２２ｃの下側に位置する糸保持連竿４５に固着した上向きの連結ピン４６が下側から嵌合する。第２糸保持板２２と糸保持連竿４５とが、連結ピン４６と係合孔２２ｄの係合を介して回動可能に連結する。   The second thread holding plate 22 has a thread hole 22b through which the sewing needle 11 passing through the needle hole 12a of the needle plate 12 passes at the front end portion of the holding arm portion 22a that protrudes forward. Further, the second thread holding plate 22 has a connecting arm portion 22c provided at the rear end portion so as to protrude leftward. In the engaging hole 22d (link connecting portion; see FIG. 5) formed in the connecting arm portion 22c, an upward connecting pin 46 fixed to the thread holding linkage 45 located below the connecting arm portion 22c is provided from below. Mating. The second yarn holding plate 22 and the yarn holding linkage 45 are rotatably connected through the engagement of the connecting pin 46 and the engagement hole 22d.

第２糸保持板２２は、保持腕部２２ａの糸孔２２ｂよりも後方位置に上方に突出した係合ピン２７（連動部材）を固着している。第２糸保持板２２が、図７に示す「保持位置」から図９に示す「待避位置」に回動する際に、係合ピン２７が第１糸保持板２１の保持腕部２１ａに係合する。その結果、第１糸保持板２１は、引っ張りコイルバネ２６の付勢力に抗して、第２糸保持板２２と共に、図７に示す「保持位置」から図９に示す「待避位置」に回動する。   The second thread holding plate 22 has an engaging pin 27 (interlocking member) protruding upward at a position behind the thread hole 22b of the holding arm portion 22a. When the second thread holding plate 22 rotates from the “holding position” shown in FIG. 7 to the “retraction position” shown in FIG. 9, the engagement pin 27 engages with the holding arm portion 21 a of the first thread holding plate 21. Match. As a result, the first thread holding plate 21 rotates together with the second thread holding plate 22 from the “holding position” shown in FIG. 7 to the “retraction position” shown in FIG. 9 against the urging force of the tension coil spring 26. To do.

針板１２の下面には、ビス止めした固定刃３０と、枢支ピン３２により回動可能に枢着した可動刃３１を設けている。可動刃３１は糸切り連竿（図示略）の先端部に連結しており、糸切断に際し、糸切りソレノイド（図示略）の駆動により糸切り駆動系を介して糸切り連竿が前方に移動すると、可動刃３１が回動して固定刃３０と協働して上糸７及び下糸（図示略）を切断する。   On the lower surface of the needle plate 12, there are provided a fixed blade 30 that is screwed and a movable blade 31 that is pivotally attached by a pivot pin 32. The movable blade 31 is connected to the tip of a thread trimming linkage (not shown), and when cutting the yarn, the thread trimming linkage moves forward via a thread trimming drive system by driving a thread trimming solenoid (not shown). Then, the movable blade 31 rotates and cooperates with the fixed blade 30 to cut the upper thread 7 and the lower thread (not shown).

次に糸保持連竿４５を介して第１及び第２糸保持板２１，２２を回動駆動する回動駆動機構３５（リンク機構）について説明する。   Next, the rotation drive mechanism 35 (link mechanism) that rotates the first and second thread holding plates 21 and 22 via the thread holding linkage 45 will be described.

図１及び図２に示すように、ベッド本体部３は、内部において、下向きに配置したステッピングモータからなる糸保持モータ３６を、取付け板３７を介しフレームに固着している。糸保持モータ３６の駆動軸３６ａに駆動レバー３８の基端部が固着し、その駆動レバー３８の先端部が連結ボルト４０を介してＬ字状のリンク板３９の基端部に連結する。また、上下に連結腕部４１ａ，４１ｂを有し、鉛直向きの枢支軸４２を介してフレームに回動可能に設けた回動レバー４１が、糸保持モータ３６の側方に位置している。   As shown in FIGS. 1 and 2, the bed main body 3 has a thread holding motor 36 formed of a stepping motor disposed downwardly fixed to a frame via a mounting plate 37 inside. The base end portion of the drive lever 38 is fixed to the drive shaft 36 a of the yarn holding motor 36, and the front end portion of the drive lever 38 is connected to the base end portion of the L-shaped link plate 39 via the connecting bolt 40. Further, a pivot lever 41 having upper and lower connecting arm portions 41 a and 41 b and pivotally provided on the frame via a vertically-oriented pivot shaft 42 is positioned on the side of the yarn holding motor 36. .

回動レバー４１の下側の連結腕部４１ａは、リンク板３９の他端部に連結ボルト４３を介して連結し、回動レバー４１の上側の連結腕部４１ｂは、糸保持連竿４５の一端部に連結ボルト４４を介して連結する。糸保持連竿４５の先端部の上面に固着した連結ピン４６は、前述したように第２糸保持板２２の連結腕部２２ｃの係合孔２２ｄに下側から嵌合している。   The lower connecting arm portion 41 a of the rotating lever 41 is connected to the other end portion of the link plate 39 via a connecting bolt 43, and the upper connecting arm portion 41 b of the rotating lever 41 is connected to the yarn holding linkage 45. The one end is connected via a connecting bolt 44. The connecting pin 46 fixed to the upper surface of the tip end portion of the yarn holding linkage 45 is fitted into the engaging hole 22d of the connecting arm portion 22c of the second yarn holding plate 22 from below as described above.

次に、図４〜図１０を用いて縫製開始時における第１糸保持板２１及び第２糸保持板２２の動作について説明する。   Next, the operation of the first thread holding plate 21 and the second thread holding plate 22 at the start of sewing will be described with reference to FIGS.

縫製開始前においては、図４に示すように、縫針１１は、針板１２上に載置した被縫製物９の上方に位置しており、目孔１１ａに挿通した上糸７を担持している。また針板１２の下面では、第１糸保持板２１が、前述した係止位置（ストッパ部２１ｄがバネ係止板２５に当接した位置。図５参照）に位置しており、第２糸保持板２２が、糸孔２２ｂと針板１２の針孔１２ａとの水平方向が一致し、針孔１２ａを貫通した縫針１１が糸孔２２ｂを貫通可能である位置に位置している。このときの第１及び第２糸保持板２１，２２の位置を「開始位置」と称する。   Before the start of sewing, as shown in FIG. 4, the sewing needle 11 is positioned above the workpiece 9 placed on the needle plate 12, and carries the upper thread 7 inserted through the eye hole 11a. Yes. On the lower surface of the needle plate 12, the first thread holding plate 21 is located at the above-described locking position (the position where the stopper portion 21d is in contact with the spring locking plate 25; see FIG. 5), and the second thread The holding plate 22 is located at a position where the horizontal direction of the thread hole 22b and the needle hole 12a of the needle plate 12 coincide, and the sewing needle 11 penetrating the needle hole 12a can penetrate the thread hole 22b. The positions of the first and second thread holding plates 21 and 22 at this time are referred to as “start positions”.

この状態から、縫い始めの最初の針落ち（第１針目）が行われると、図５及び図６に示すように、縫針１１の下降により被縫製物９を貫通した上糸７が、針板１２の針孔１２ａ及び第２糸保持板２２の糸孔２２ｂを挿通して下方に垂下する。このときの第１及び第２糸保持板２１，２２は、上述した「開始位置」に位置している。なお、このときの第２糸保持板２２の位置が、特許請求の範囲各項記載の糸捕捉位置に相当する。   When the first needle drop (first stitch) at the start of sewing is performed from this state, as shown in FIGS. 5 and 6, as shown in FIGS. The twelve needle holes 12a and the thread hole 22b of the second thread holding plate 22 are inserted and suspended downward. The first and second thread holding plates 21 and 22 at this time are located at the “start position” described above. Note that the position of the second thread holding plate 22 at this time corresponds to the thread catching position described in the claims.

第１針目の縫針１１が第２糸保持板２２の糸孔２２ｂから離脱した後、図７及び図８に示すように、回動駆動機構３５の駆動により糸保持連竿４５が後方に移動し、連結ピン４６と係合孔２２ｄの係合を介して第２糸保持板２２が平面視（図７参照）時計回りの方向に回動する。これにより、第２糸保持板２２は、保持腕部２２aの糸孔２２ｂに上糸７を通過させた状態で、上面が第１糸保持板２１の貫通孔２１ｂに対向し、糸孔２２ｂを通過した状態の上糸７を第１糸保持板２１の貫通孔２１ｂに受け入れて上糸７を保持するための位置に移動する。これにより、第１及び第２糸保持板２１，２２は、上糸７の通路を屈曲させて糸通過抵抗付与部Ｓを形成し、上糸７の糸端に対し糸通過抵抗を付与する。また、第２糸保持板２２の係合ピン２７が、第１糸保持板２１の保持腕部２１ａに係合する。このときの第１及び第２糸保持板２１，２２の位置を「保持位置」と称する。   After the first sewing needle 11 is detached from the thread hole 22b of the second thread holding plate 22, as shown in FIGS. 7 and 8, the thread holding linkage 45 is moved rearward by the rotation drive mechanism 35. The second thread holding plate 22 rotates in the clockwise direction in plan view (see FIG. 7) through the engagement between the connecting pin 46 and the engagement hole 22d. Thereby, the upper surface of the second thread holding plate 22 faces the through hole 21b of the first thread holding plate 21 with the upper thread 7 passed through the thread hole 22b of the holding arm portion 22a, and the thread hole 22b The passed upper thread 7 is received in the through hole 21 b of the first thread holding plate 21 and moved to a position for retaining the upper thread 7. As a result, the first and second yarn holding plates 21 and 22 bend the passage of the upper yarn 7 to form the yarn passage resistance applying portion S, and give yarn passage resistance to the yarn end of the upper yarn 7. Further, the engagement pin 27 of the second thread holding plate 22 is engaged with the holding arm portion 21 a of the first thread holding plate 21. The positions of the first and second thread holding plates 21 and 22 at this time are referred to as “holding positions”.

第１糸保持板２１の保持腕部２１ａと第２糸保持板２２の係合ピン２７との係合により、第１糸保持板２１の側面と第２糸保持板２２の側面との間に相対回動方向寸法の間隙を設ける。その結果、図７に示すように、第２糸保持板２２の保持腕部２２ａの側面２２ｅと、第１糸保持板２１の貫通孔２１ｂの側面(内面)２１ｆとの間に相対回動方向に沿った寸法の間隙Ｄを維持している。   Due to the engagement between the holding arm portion 21 a of the first thread holding plate 21 and the engaging pin 27 of the second thread holding plate 22, there is a gap between the side surface of the first thread holding plate 21 and the side surface of the second thread holding plate 22. A gap having a relative rotational direction dimension is provided. As a result, as shown in FIG. 7, the relative rotation direction between the side surface 22 e of the holding arm portion 22 a of the second yarn holding plate 22 and the side surface (inner surface) 21 f of the through hole 21 b of the first yarn holding plate 21. A gap D having a dimension along the line is maintained.

なお、図４、図６、図８及び図１０に示すように、針板１２の下部には釜糸案内部材１９を設けており、図１１に示すように、釜糸案内部材１９には下糸を上方に引き出すための下糸引き出し用の開口部１９ａを設けている。釜糸案内部材１９は、開口部１９ａの左端側に上糸７のループを広げるための三角形状部１９ｂを、開口部１９ａの右端側に縁部１９ｃを有している。第１及び第２糸保持板２１，２２は、上述した「保持位置」における第２糸保持板２２の糸孔２２ｂが、針板１２の針孔１２ａの直下位置から縁部１９ｃ側となる向きに回動する。これにより、図８に示すように、第１及び第２糸保持板２１，２２が「保持位置」に移動した際の上糸７の糸端は、釜糸案内部材１９の開口部１９ａの上部ではなくその周囲(右側)である縁部１９ｃ側の上部に位置する。   4, 6, 8, and 10, a hook thread guide member 19 is provided at the lower portion of the needle plate 12, and the hook thread guide member 19 has a lower part as shown in FIG. 11. An opening 19a for pulling out a lower thread for pulling out the thread upward is provided. The hook yarn guide member 19 has a triangular portion 19b for expanding the loop of the upper thread 7 on the left end side of the opening portion 19a, and an edge portion 19c on the right end side of the opening portion 19a. The first and second thread retaining plates 21 and 22 are oriented such that the thread hole 22b of the second thread retaining plate 22 at the above-described “holding position” is located on the edge 19c side from the position directly below the needle hole 12a of the needle plate 12. To turn. As a result, as shown in FIG. 8, when the first and second thread holding plates 21 and 22 are moved to the “holding position”, the thread end of the upper thread 7 is located above the opening 19 a of the hook thread guide member 19. Instead, it is located in the upper part on the edge 19c side that is the periphery (right side).

その後、被縫製物９を送りつつ縫製が進行し、所定の回数（例えば２〜３回）針落ちが行われると、図９及び図１０（煩雑防止のため１回の針落ちのみ行われた場合を示す）に示すように、回動駆動機構３５の駆動により糸保持連竿４５がさらに後方に移動し、連結ピン４６と係合孔２２ｄの係合を介して第２糸保持板２２が平面視（図９参照）時計回りの方向にさらに回動する。保持腕部２１ａに係合した係合ピン２７により、第１糸保持板２１は、引っ張りコイルバネ２６の付勢力に抗して第２糸保持板２２と共に回動する。その結果、第１糸保持板２１と第２糸保持板２２は、糸通過抵抗付与部Ｓを形成したまま、上糸７の糸端部を保持するための糸通過抵抗を維持した状態で、上述した「保持位置」よりも針孔１２ａから離れた位置まで回動する。このときの第１及び第２糸保持板２１，２２の位置を「待避位置」と称する。   Thereafter, the sewing progresses while the workpiece 9 is fed, and when the needle drop is performed a predetermined number of times (for example, 2 to 3 times), FIG. 9 and FIG. 10 (only one needle drop is performed to prevent complications). As shown in FIG. 4, the yarn holding linkage 45 is further moved rearward by the rotation drive mechanism 35, and the second yarn holding plate 22 is moved through the engagement of the connecting pin 46 and the engaging hole 22d. Further rotation in a clockwise direction in plan view (see FIG. 9). The first thread retaining plate 21 rotates together with the second thread retaining plate 22 against the urging force of the tension coil spring 26 by the engaging pin 27 engaged with the retaining arm portion 21 a. As a result, the first yarn holding plate 21 and the second yarn holding plate 22 maintain the yarn passage resistance for holding the yarn end portion of the upper yarn 7 while forming the yarn passage resistance application portion S, It rotates to a position farther from the needle hole 12a than the "holding position" described above. The positions of the first and second thread holding plates 21 and 22 at this time are referred to as “retreat positions”.

その後、縫製が進行していくと、上糸７の糸端は被縫製物９に引っ張られて糸通過抵抗付与部Ｓから抜ける。尚、保持した糸端が短い場合は、糸通過抵抗付与部Ｓが前記保持位置に位置しているときに、数針縫えば糸端が糸通過抵抗付与部Ｓから抜け出す。数針縫ったときに、まだ糸端が糸通過抵抗付与部Ｓから抜け出ていない場合でも、待避位置に糸端が糸通過抵抗付与部Ｓを移動すれば糸端の糸通過抵抗付与部Ｓからの離脱を促進することができる。   Thereafter, as the sewing progresses, the thread end of the upper thread 7 is pulled by the workpiece 9 and comes out of the thread passage resistance applying portion S. When the held yarn end is short, the yarn end comes out of the yarn passing resistance applying portion S if several stitches are sewn when the yarn passing resistance applying portion S is located at the holding position. Even if the yarn end has not yet come out of the yarn passage resistance applying portion S when several stitches are sewn, if the yarn end moves the yarn passage resistance applying portion S to the retracted position, the yarn end from the yarn passage resistance applying portion S at the yarn end. The withdrawal of can be promoted.

次に、以上説明した実施形態の作用及び効果を説明する。   Next, the operation and effect of the embodiment described above will be described.

本実施形態の電子閂止めミシン１の上糸保持機構２０は、第１糸保持板２１と第２糸保持板２２とを有する。第１糸保持板２１は針板１２の下面に設けており、第２糸保持板２２は第１糸保持板２１の下方に設けている。第２糸保持板２２は糸孔２２ｂを備えている。縫製開始時に縫針１１の上下動により縫針１１の目孔１１ａが担持した上糸７は、針板１２の針孔１２ａから下方に垂下する。上糸７の糸端部は、第１糸保持板２１と第２糸保持板２２との間の糸通過抵抗付与部Ｓで屈曲した後、第２糸保持板２２の糸孔２２ｂを通過する。糸通過抵抗付与部Ｓは、糸端の通路が屈曲したものとなっている。縫製開始時に糸端が屈曲通路から外に引っ張られるが糸端に抵抗がかかるので、１針目から糸端が糸通過抵抗付与部Ｓから抜け落ちてしまうことがない。縫製が進行していくと、上糸７の糸端は被縫製物９に引っ張られて糸通過抵抗付与部Ｓから抜けていく。   The upper thread holding mechanism 20 of the electronic tacking sewing machine 1 of the present embodiment includes a first thread holding plate 21 and a second thread holding plate 22. The first thread holding plate 21 is provided on the lower surface of the needle plate 12, and the second thread holding plate 22 is provided below the first thread holding plate 21. The second thread holding plate 22 includes a thread hole 22b. The upper thread 7 carried by the eye hole 11a of the sewing needle 11 by the vertical movement of the sewing needle 11 at the start of sewing hangs downward from the needle hole 12a of the needle plate 12. The yarn end portion of the upper yarn 7 is bent at the yarn passage resistance applying portion S between the first yarn holding plate 21 and the second yarn holding plate 22 and then passes through the yarn hole 22b of the second yarn holding plate 22. . The yarn passing resistance applying portion S is formed by bending the yarn end passage. At the start of sewing, the thread end is pulled out of the bending path, but resistance is applied to the thread end, so that the thread end does not fall out of the thread passage resistance applying portion S from the first stitch. As the sewing proceeds, the thread end of the upper thread 7 is pulled by the workpiece 9 and comes out of the thread passage resistance applying portion S.

本実施形態の上糸保持機構２０は、第１糸保持板２１と第２糸保持板２２とで糸端を離脱不能に狭持する上糸掴み機構ではなく、糸端の通路を屈曲して糸端の通過抵抗を付与して上糸７を保持する上糸保持機構である。これにより、上糸７の保持力を、強すぎることなく弱すぎることのない、適正な値とすることができる。   The upper thread holding mechanism 20 according to the present embodiment is not an upper thread gripping mechanism in which the first thread holding plate 21 and the second thread holding plate 22 nip the thread end so as not to be detached, but bends the thread end passage. This is an upper thread holding mechanism that holds the upper thread 7 by imparting a thread end passage resistance. Thereby, the holding force of the upper thread 7 can be set to an appropriate value that is neither too strong nor too weak.

したがって、被縫製物９への縫目形成数が比較的少ない縫製の初期において、糸通過抵抗付与部Ｓから上糸７が抜けない程度に上糸７を保持しつつ、ミシン１の送り機構が被縫製物９を１針毎に送った量に応じて上糸７を被縫製物９側に徐々に送り出すことができる。この結果、上糸掴み機構の強固な掴み力で上糸７を掴んだままミシンの送り機構が被縫製物９を送ることで発生する、被縫製物９のしわを防止することができる。また、最初に保持した糸端部の長さがやや長すぎたとしても、その後の上糸の送り出しにより保持する糸端部の長さを徐々に短くすることができる。上糸７のループに下糸ボビンケース１７がくぐり抜ける際に、上糸７の糸端部が上糸ループに巻き込まれてしまうことを抑制することができる。   Accordingly, in the initial stage of sewing in which the number of stitches formed on the workpiece 9 is relatively small, the feed mechanism of the sewing machine 1 holds the upper thread 7 to such an extent that the upper thread 7 cannot be removed from the thread passage resistance applying portion S. The upper thread 7 can be gradually sent to the sewing product 9 side according to the amount of the sewing product 9 sent for each stitch. As a result, it is possible to prevent wrinkles of the sewing product 9 that occur when the sewing machine feed mechanism feeds the sewing product 9 while the upper thread 7 is held by the firm holding force of the upper thread holding mechanism. Further, even if the length of the yarn end portion held first is slightly too long, the length of the yarn end portion held by the subsequent feeding of the upper yarn can be gradually shortened. When the lower thread bobbin case 17 passes through the loop of the upper thread 7, it is possible to prevent the thread end portion of the upper thread 7 from being caught in the upper thread loop.

また、本実施形態では特に、第１糸保持板２１の下面と第２糸保持板２２の上面との間に、所定の上下方向寸法の間隙と、前記第１糸保持部材の側面と前記第２糸保持部材の側面との間に相対回動方向寸法の間隙とを設けた。このように、第１糸保持板２１と第２糸保持板２２とで上糸７を狭持するのではなく、第１糸保持板２１と第２糸保持板２２との間に隙間を設け、且つ上糸７を屈曲させることで糸通過抵抗を付与し上糸７を保持する。これにより、上糸７の保持力を、強すぎることなく弱すぎることのない、適正な値とすることができる。   Further, in the present embodiment, in particular, a gap of a predetermined vertical dimension, a side surface of the first yarn holding member, and the first yarn are provided between the lower surface of the first yarn holding plate 21 and the upper surface of the second yarn holding plate 22. A gap having a relative rotational direction dimension was provided between the two yarn holding members. In this way, the upper thread 7 is not held between the first thread holding plate 21 and the second thread holding plate 22, but a gap is provided between the first thread holding plate 21 and the second thread holding plate 22. Further, the upper thread 7 is held by bending the upper thread 7 to provide a thread passage resistance. Thereby, the holding force of the upper thread 7 can be set to an appropriate value that is neither too strong nor too weak.

また、本実施形態では特に、第１糸保持板２１の下面と第２糸保持板２２の上面との間に上下方向寸法の間隙を与えるスペーサ部材１８を設ける。これにより、糸通過抵抗を付与するために必要な第１糸保持板２１と第２糸保持板２２との間の間隙を、確実に形成することができる。   In the present embodiment, in particular, a spacer member 18 that provides a gap in the vertical dimension is provided between the lower surface of the first yarn holding plate 21 and the upper surface of the second yarn holding plate 22. As a result, a gap between the first yarn holding plate 21 and the second yarn holding plate 22 necessary for providing the yarn passage resistance can be reliably formed.

また、本実施形態では特に、第１糸保持板２１に、目孔１１ａから下方に延びる上糸７を受け入れる貫通孔２１ｂを設ける。これにより、第１糸保持板２１と第２糸保持板２２との間の間隙において上糸７を屈曲させて通過させるとき、第１糸保持板２１の貫通孔２１ｂと第２糸保持板２２との間を上糸７が確実に通過するように上糸７を受け入れて上糸７の通過抵抗を確実に適正な値とすることができる。   In the present embodiment, in particular, the first thread holding plate 21 is provided with a through hole 21b for receiving the upper thread 7 extending downward from the eye hole 11a. Thus, when the upper thread 7 is bent and passed through the gap between the first thread holding plate 21 and the second thread holding plate 22, the through hole 21 b of the first thread holding plate 21 and the second thread holding plate 22. The upper thread 7 can be received so that the upper thread 7 reliably passes between the upper thread 7 and the passage resistance of the upper thread 7 can be reliably set to an appropriate value.

また、本実施形態では特に、針板１２に対し枢支ピン２４を介して第２糸保持板２２を水平方向に回動可能に支持する。上糸７を糸孔２２ｂに通過させる「開始位置」と上糸７を保持する「保持位置」との間の切り替えを、水平方向の回転運動で行うことができる。第２糸保持板２２の位置の切り替えを直線的なスライド運動で行う場合よりも、第２糸保持板２２の針板１２への支持構造を簡素化することができる。   In the present embodiment, in particular, the second thread holding plate 22 is supported by the needle plate 12 via the pivot pin 24 so as to be rotatable in the horizontal direction. Switching between the “start position” for allowing the upper thread 7 to pass through the thread hole 22 b and the “holding position” for retaining the upper thread 7 can be performed by a horizontal rotational movement. The support structure of the second thread holding plate 22 to the needle plate 12 can be simplified as compared with the case where the position of the second thread holding plate 22 is switched by a linear slide motion.

また、本実施形態では特に、「開始位置」と「保持位置」との間で第２糸保持板２２が回動する。これにより、「開始位置」で上糸７を糸孔２２ｂに通過させた後、回動して「保持位置」に切り替え、その「保持位置」で上糸７を第１糸保持板２１の貫通孔２１ｂに受け入れて保持することができる。   In the present embodiment, in particular, the second thread holding plate 22 rotates between the “start position” and the “holding position”. As a result, after the upper thread 7 is passed through the thread hole 22b at the “start position”, the upper thread 7 is rotated and switched to the “holding position”, and the upper thread 7 passes through the first thread holding plate 21 at the “holding position”. It can be received and held in the hole 21b.

また、本実施形態では特に、第２糸保持板２２に係合孔２２ｄを設けている。これにより、回動駆動機構３５からの駆動力を連結ピン４６を介して係合孔２２ｄに伝達することで、第２糸保持板２２を回動させることができる。   In the present embodiment, in particular, the second thread holding plate 22 is provided with an engagement hole 22d. Accordingly, the second thread holding plate 22 can be rotated by transmitting the driving force from the rotation driving mechanism 35 to the engagement hole 22d via the connecting pin 46.

また、本実施形態では特に、枢支ピン２４を介し、第１糸保持板２１を「保持位置」と「退避位置」との間で回動可能に支持する。これにより、「保持位置」に配置した第１糸保持板２１に対して第２糸保持板２２を相対移動させて、上糸通過抵抗付与部Ｓを構成できる。その後、第１糸保持板２１と第２糸保持板２２との相対位置関係を維持したまま上糸通過抵抗付与部Ｓを針孔１２ａよりも離れた「退避位置」へ移動できる。また、上糸保持のための上糸通過抵抗を維持したまま退避する「退避位置」への移動を回動運動で行うことができる。縫製開始後の１針目の糸端を「保持位置」で上糸７に通過抵抗を付与しつつ保持し、適宜針数縫製後に積極的に「退避位置」に移動させることにより糸端の糸通過抵抗付与部Ｓからの離脱を促進することができる。位置の切り替えを直線的なスライド運動で行う場合よりも、第１糸保持板２１及び第２糸保持板２２の針板１２への支持構造を簡素化することができる。第１糸保持板２１を第２糸保持板２２と共通の軸部材である枢支ピン２４で支持することにより、部材数を減らすことができるとともに、互いに回動中心を一致させ、回動駆動のために必要な周囲の構成を簡素化することができる。   In the present embodiment, in particular, the first thread holding plate 21 is rotatably supported between the “holding position” and the “retracted position” via the pivot pin 24. Thereby, the upper thread passage resistance applying portion S can be configured by moving the second thread holding plate 22 relative to the first thread holding plate 21 arranged at the “holding position”. Thereafter, while maintaining the relative positional relationship between the first thread holding plate 21 and the second thread holding plate 22, the upper thread passage resistance applying portion S can be moved to the “retracted position” that is further away from the needle hole 12a. Further, the movement to the “retraction position” for retreating while maintaining the upper thread passage resistance for retaining the upper thread can be performed by a rotational motion. The thread end of the first stitch after the start of sewing is held at the “holding position” while applying resistance to the upper thread 7, and the thread passes through the thread end by actively moving to the “retraction position” after sewing the appropriate number of stitches. The detachment from the resistance applying part S can be promoted. The support structure of the first thread holding plate 21 and the second thread holding plate 22 to the needle plate 12 can be simplified as compared with the case where the position is switched by a linear slide motion. By supporting the first thread holding plate 21 with a pivot pin 24 that is a common shaft member with the second thread holding plate 22, the number of members can be reduced and the rotation centers can be made to coincide with each other. Therefore, it is possible to simplify the surrounding configuration required.

また、本実施形態では特に、「保持位置」と「退避位置」との間で第１糸保持板１２が回動する。これにより、「保持位置」で上糸７を第２糸保持板２２と第１糸保持板２１の貫通孔２１ｂとの間に受け入れて保持し、第１糸保持板２１の貫通孔２１ｂと第２糸保持板２２との間を第１針目から糸端の抜け落ちを防止しつつ糸端が確実に上糸通過抵抗付与部Ｓを通過するようになる。その後、「退避位置」に回動して、糸通過抵抗付与部Ｓからの糸端部の離脱を促進できる。   In the present embodiment, in particular, the first thread holding plate 12 rotates between the “holding position” and the “retracted position”. As a result, the upper thread 7 is received and held between the second thread holding plate 22 and the through hole 21b of the first thread holding plate 21 at the “holding position”, and the upper thread 7 and the through hole 21b of the first thread holding plate 21 are The yarn end surely passes through the upper yarn passing resistance applying portion S while preventing the yarn end from falling off from the first stitch between the two yarn holding plates 22. Thereafter, it can be rotated to the “retracted position” to facilitate the removal of the yarn end portion from the yarn passage resistance applying portion S.

また、本実施形態では特に、第２糸保持板２２に係合ピン２７を設け、「開始位置」、「保持位置」、「退避位置」の間で回動可能とする。これにより、第２糸保持板２２を駆動し「保持位置」から「退避位置」へ回動させるとき、連動して第１糸保持板２１も「退避位置」へと回動させることができる。また、下糸が針板１２の上部に出た状態となっていた場合、第１糸保持板２１と第２糸保持板２２とが連動して「退避位置」へ回動した後に「開始位置」に戻るときに、下糸を押し出すことで針板１２の下部に戻すことも可能である。   In the present embodiment, in particular, an engagement pin 27 is provided on the second thread holding plate 22 so as to be rotatable between a “start position”, a “hold position”, and a “retract position”. Accordingly, when the second thread holding plate 22 is driven and rotated from the “holding position” to the “retracted position”, the first thread holding plate 21 can also be rotated to the “retracted position”. Further, when the lower thread has come out above the needle plate 12, the first thread holding plate 21 and the second thread holding plate 22 are interlocked and rotated to the “retraction position”, and then the “start position”. It is also possible to return to the lower part of the needle plate 12 by pushing out the lower thread.

また、本実施形態では特に、針板１２の下部に釜糸案内部材１９を設けており、釜糸案内部材１９には下糸を上方に引き出すための下糸引き出し用の開口部１９ａを設けている。また、上糸７を糸孔２２ｂに通過させる第２糸保持板２２を針板１２に対し回動可能に支持する。第２糸保持板２２が「保持位置」にあるときには、上糸７の先端が、釜糸案内部材１９の下糸引き出し用の開口部１９ａの上部ではなく、開口部１９ａの周囲（１９ｃ側）の上部に位置している。これにより、上糸７の先端が、下糸引き出し用の開口部１９ａから釜の内部に入り込み下糸あるいは釜をくぐりぬけた上糸７と絡まるのを確実に防止することができる。   In this embodiment, in particular, the hook thread guide member 19 is provided at the lower part of the needle plate 12, and the hook thread guide member 19 is provided with an opening 19a for pulling the lower thread for pulling the lower thread upward. Yes. Further, the second thread holding plate 22 that allows the upper thread 7 to pass through the thread hole 22b is supported rotatably with respect to the needle plate 12. When the second thread holding plate 22 is in the “holding position”, the tip of the upper thread 7 is not the upper part of the lower thread drawing opening 19a of the hook thread guide member 19 but around the opening 19a (19c side). Located at the top of the. As a result, it is possible to reliably prevent the tip of the upper thread 7 from entering the inside of the hook through the lower thread drawing opening 19a and getting entangled with the upper thread 7 passing through the lower thread or the hook.

なお、本発明は、上記実施形態に限られるものではなく、その趣旨及び技術的思想を逸脱しない範囲内で種々の変形が可能である。   The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit and technical idea of the present invention.

例えば、前述した実施形態では、第１糸保持板２１に貫通孔２１ｂを設け、当該貫通孔２１ｂで第２糸保持板２２との間を上糸７が通過するように受け入れる構成としたが、必ずしも貫通させる必要はなく、図１２に示すように、第１糸保持板２１の下面に凹部２１ｅを設ける構成としてもよい。これによっても、第１糸保持板２１と第２糸保持板２２との間の間隙において上糸７を屈曲させて通過させるとき、第１糸保持板２１の凹部２１ｅと第２糸保持板２２との間を上糸７が確実に通過するように上糸７を受け入れて上糸７の通過抵抗を確実に適正な値とすることができる。   For example, in the above-described embodiment, the first thread holding plate 21 is provided with the through hole 21b, and the through hole 21b is configured to receive the upper thread 7 between the second thread holding plate 22; It is not always necessary to pass through, and a recess 21e may be provided on the lower surface of the first thread holding plate 21 as shown in FIG. Also by this, when the upper yarn 7 is bent and passed through the gap between the first yarn holding plate 21 and the second yarn holding plate 22, the concave portion 21e of the first yarn holding plate 21 and the second yarn holding plate 22 are passed. The upper thread 7 can be received so that the upper thread 7 reliably passes between the upper thread 7 and the passage resistance of the upper thread 7 can be reliably set to an appropriate value.

前述した実施形態では、糸通過抵抗付与部Ｓを形成するために、第１糸保持板２１の下面と第２糸保持板２２の上面との間に所定の上下方向寸法の間隙と、前記第１糸保持部材の側面と前記第２糸保持部材の側面との間に相対回動方向寸法の間隙とを設けている。両方向の間隙を設けることにより糸端を確実に離脱可能に保持することができる。しかしながら、糸端を離脱可能に保持するための構成としては、上下方向寸法の間隙と相対回動方向寸法の間隙の両方ともに必要というわけではない。上下方向寸法の間隙と相対回動方向寸法の間隙の少なくとも一方を設ければよい。   In the above-described embodiment, in order to form the yarn passage resistance applying portion S, a gap having a predetermined vertical dimension between the lower surface of the first yarn holding plate 21 and the upper surface of the second yarn holding plate 22, and the first A gap having a relative rotational direction dimension is provided between the side surface of the one yarn holding member and the side surface of the second yarn holding member. By providing a gap in both directions, the yarn end can be securely held so as to be detachable. However, the configuration for holding the yarn end in a detachable manner does not require both the vertical dimension gap and the relative rotational direction dimension gap. It is sufficient to provide at least one of a gap having a vertical dimension and a gap having a relative rotation direction dimension.

その他、一々例示はしないが、本発明は、その趣旨を逸脱しない範囲内において、種々の変更が加えられて実施されるものである。   In addition, although not illustrated one by one, the present invention is implemented with various modifications within a range not departing from the gist thereof.

電子閂止めミシンの全体構造を表す外観図である。It is an external view showing the whole structure of an electronic tacking sewing machine. 上糸保持機構の全体構造を表す斜め下方向から見た斜視図である。It is the perspective view seen from the diagonally downward direction showing the whole structure of an upper thread holding mechanism. 第１糸保持板と第２糸保持板との間の間隙構造を表す、図５のＸ−Ｘ線に対応する断面図である。It is sectional drawing corresponding to the XX line of FIG. 5 showing the gap | interval structure between a 1st thread | yarn holding board and a 2nd thread | yarn holding board. 縫製開始前の第１糸保持板と第２糸保持板の位置を表す、一部を断面で表したベッド部の正面図である。It is a front view of the bed part which represented the position of the 1st thread | yarn holding board and 2nd thread | yarn holding board before a sewing start, and represented a part in cross section. 第１糸保持板と第２糸保持板の開始位置を表す、針板を透視した平面図である。It is the top view which sees through the needle plate showing the starting position of the 1st thread retention board and the 2nd thread retention board. 第１糸保持板と第２糸保持板の開始位置を表す、一部を断面で表したベッド部の正面図である。It is a front view of the bed part which represented the start position of a 1st thread | yarn holding board and a 2nd thread | yarn holding board, and represented a part in cross section. 第１糸保持板と第２糸保持板の保持位置を表す、針板を透視した平面図である。It is the top view which sees through the needle plate showing the holding position of the 1st thread holding plate and the 2nd thread holding plate. 第１糸保持板と第２糸保持板の保持位置を表す、一部を断面で表したベッド部の正面図である。It is a front view of the bed part which represented the holding position of a 1st thread | yarn holding board and a 2nd thread | yarn holding board, and represented a part in cross section. 第１糸保持板と第２糸保持板の待避位置を表す、針板を透視した平面図である。It is the top view which saw through the needle | hook plate showing the retracted position of a 1st thread | yarn holding board and a 2nd thread | yarn holding board. 第１糸保持板と第２糸保持板の待避位置を表す、一部を断面で表したベッド部の正面図である。It is a front view of the bed part which expressed the retreat position of the 1st thread holding board and the 2nd thread holding board, and expressed a part in section. 釜糸案内部材の構造を表す斜め上方向から見た斜視図である。It is the perspective view seen from the diagonally upper direction showing the structure of a hook thread guide member. 第１糸保持板の下面に凹部を設けた構造を表す断面図である。It is sectional drawing showing the structure which provided the recessed part in the lower surface of a 1st thread | yarn holding board.

符号の説明Explanation of symbols

１ 電子閂止めミシン（ミシン）
２ ベッド部
７ 上糸
１１ 縫針
１１ａ 目孔
１２ 針板
１２ａ 針孔
１８ スペーサ部材
１９ 釜糸案内部材
１９ａ 開口部
２０ 上糸保持機構
２１ 第１糸保持板（第１糸保持部材）
２１ｂ 貫通孔（凹部）
２１ｅ 凹部
２２ 第２糸保持板（第２糸保持部材）
２２ｂ 糸孔
２２ｄ 係合孔（リンク連結部）
２４ 枢支ピン（軸部材）
２７ 係合ピン（連動部材）
３５ 回動駆動機構（リンク機構）
Ｓ 糸通過抵抗付与部 1 Electronic sewing machine (sewing machine)
2 Bed portion 7 Upper thread 11 Sewing needle 11a Eye hole 12 Needle plate 12a Needle hole 18 Spacer member 19 Hook thread guide member 19a Opening 20 Upper thread holding mechanism 21 First thread holding plate (first thread holding member)
21b Through hole (concave)
21e Concave portion 22 Second thread holding plate (second thread holding member)
22b Yarn hole 22d Engagement hole (link connecting part)
24 pivot pin (shaft member)
27 Engagement pin (interlocking member)
35 Rotation drive mechanism (link mechanism)
S Yarn passage resistance application section

Claims (11)

針孔を備えベッド部に設けた針板と、
上糸を担持する目孔を備え上下動する縫針と
を有するミシンにおいて、
前記針板の下面に設けた第１糸保持部材と、
前記針孔を貫通した前記縫針が通過する糸孔を備え、前記第１糸保持部材の下方において、前記第１糸保持部材に対して相対移動可能に設けた第２糸保持部材とを有し、
縫製開始にともない、縫針が前記糸孔を貫通するように第２糸保持部材を糸捕捉位置に移動し、縫針が前記糸孔から離脱した後に第１糸保持部材に対して相対移動して、屈曲状の糸通過抵抗付与部を形成し、縫針の目孔から下方に延びる上糸の糸端を前記糸通過抵抗付与部に挿通保持した
ことを特徴とするミシンの上糸保持機構。 A needle plate provided with a needle hole in the bed,
In a sewing machine having a needle that carries an upper thread and has a needle that moves up and down,
A first thread holding member provided on the lower surface of the needle plate;
A second thread holding member provided with a thread hole through which the sewing needle passing through the needle hole passes, and provided below the first thread holding member so as to be movable relative to the first thread holding member. ,
With the start of sewing, the second thread holding member is moved to the thread catching position so that the sewing needle penetrates the thread hole, and the sewing needle moves relative to the first thread holding member after detaching from the thread hole, An upper thread holding mechanism for a sewing machine, characterized in that it forms a bent thread passage resistance applying portion, and the thread end of the upper thread extending downward from the stitch hole of the sewing needle is inserted and held in the thread passing resistance applying portion. 請求項１記載のミシンの上糸保持機構において、
前記糸通過抵抗付与部は、
前記第１糸保持部材の下面と前記第２糸保持部材の上面との間に設けた所定の上下方向寸法の間隙と、前記第１糸保持部材の側面と前記第２糸保持部材の側面との間に設けた前記相対移動方向寸法の間隙との少なくともいずれか一方を備えた
ことを特徴とするミシンの上糸保持機構。 In the upper thread holding mechanism of the sewing machine according to claim 1,
The yarn passing resistance applying unit is
A gap having a predetermined vertical dimension provided between the lower surface of the first yarn holding member and the upper surface of the second yarn holding member; a side surface of the first yarn holding member; and a side surface of the second yarn holding member. An upper thread holding mechanism for a sewing machine provided with at least one of the gaps in the relative movement direction dimension provided between them. 請求項２記載のミシンの上糸保持機構において、
前記上下方向寸法の間隙を与えるスペーサ部材を、前記第１糸保持部材と前記第２糸保持部材との間に設けた
ことを特徴とするミシンの上糸保持機構。 In the upper thread holding mechanism of the sewing machine according to claim 2,
An upper thread holding mechanism for a sewing machine, wherein a spacer member for providing a gap in the vertical dimension is provided between the first thread holding member and the second thread holding member. 請求項２又は請求項３記載のミシンの上糸保持機構において、
前記糸通過抵抗付与部は、
前記第１糸保持部材の下面に、前記目孔から下方に延びる前記上糸を受け入れる凹部を設けた
ことを特徴とするミシンの上糸保持機構。 In the upper thread holding mechanism of the sewing machine according to claim 2 or 3,
The yarn passing resistance applying unit is
An upper thread holding mechanism for a sewing machine, wherein a recess for receiving the upper thread extending downward from the eye hole is provided on a lower surface of the first thread holding member. 請求項４記載のミシンの上糸保持機構において、
前記針板に対し軸部材を介して前記第２糸保持部材を水平方向に回動可能に支持したことを特徴とするミシンの上糸保持機構。 In the upper thread holding mechanism of the sewing machine according to claim 4,
An upper thread holding mechanism for a sewing machine, wherein the second thread holding member is supported on the needle plate via a shaft member so as to be rotatable in a horizontal direction. 請求項５記載のミシンの上糸保持機構において、
前記第２糸保持部材を、
前記糸孔と前記針孔との水平方向位置が一致し、前記上糸を前記糸孔に通過させる開始位置と、
上面が前記第１糸保持部材の前記凹部に対向し、前記糸孔を通過した状態の前記上糸を前記凹部に受け入れて前記上糸を保持する保持位置と
の間で回動可能に構成した
ことを特徴とするミシンの上糸保持機構。 In the upper thread holding mechanism of the sewing machine according to claim 5,
The second thread holding member;
The horizontal position of the thread hole and the needle hole are coincident, a start position to pass the upper thread through the thread hole,
An upper surface faces the recess of the first thread holding member, and the upper thread in a state of passing through the thread hole is received in the recess and can be rotated between a holding position for holding the upper thread. An upper thread holding mechanism of a sewing machine characterized by that. 請求項５又は請求項６記載のミシンの上糸保持機構において、
前記第２糸保持部材は、
回動用の駆動力を伝達するリンク機構を作動連結するリンク連結部を備える
ことを特徴とするミシンの上糸保持機構。 In the upper thread holding mechanism of the sewing machine according to claim 5 or 6,
The second thread holding member is
An upper thread holding mechanism for a sewing machine comprising a link connecting portion for operatively connecting a link mechanism for transmitting a driving force for rotation. 請求項７記載のミシンの上糸保持機構において、
前記第１糸保持部材を、前記第２糸保持部材と共通の前記軸部材を介し、前記針板に平行な方向に回動可能に支持し、第２糸保持部材とともに前記糸通過抵抗付与部を構成する保持位置と、その糸通過抵抗付与部を構成したまま第２糸保持部材とともに回動して前記保持位置よりも針孔から離れた退避位置へ移動可能にした
ことを特徴とするミシンの上糸保持機構。 In the upper thread holding mechanism of the sewing machine according to claim 7,
The first thread holding member is supported so as to be rotatable in a direction parallel to the needle plate via the shaft member common to the second thread holding member, and together with the second thread holding member, the thread passage resistance applying portion The sewing machine is configured to be movable to a retreat position that is further away from the needle hole than the holding position by rotating together with the second thread holding member while forming the yarn passing resistance applying portion. Upper thread holding mechanism. 請求項８記載のミシンの上糸保持機構において、
前記第１糸保持部材を、
前記凹部が前記第２糸保持部材の上面と対向し、前記糸孔を通過した状態の前記上糸を前記凹部に受け入れて前記上糸を保持する前記保持位置と、
前記糸端部を保持するための糸通過抵抗を維持した状態で退避する前記退避位置と
の間で回動可能に構成した
ことを特徴とするミシンの上糸保持機構。 The upper thread holding mechanism of the sewing machine according to claim 8,
The first thread holding member;
The holding position for holding the upper thread by receiving the upper thread in a state in which the concave part faces the upper surface of the second thread holding member and has passed through the thread hole;
An upper thread holding mechanism for a sewing machine, wherein the upper thread holding mechanism is configured to be rotatable between the retracted position and the retracted position in which the thread end resistance for retaining the thread end is maintained. 請求項９記載のミシンの上糸保持機構において、
前記第２糸保持部材を、
前記開始位置と、前記保持位置と、前記退避位置との間で回動可能に構成し、
前記第１糸保持部材を前記第２糸保持部材と連動して前記保持位置から前記退避位置へ回動させるための連動部材を、前記第２糸保持部材に設けた
ことを特徴とするミシンの上糸保持機構。 In the upper thread holding mechanism of the sewing machine according to claim 9,
The second thread holding member;
It is configured to be rotatable between the start position, the holding position, and the retracted position,
A sewing machine comprising: an interlocking member for rotating the first thread retaining member from the retaining position to the retracted position in conjunction with the second thread retaining member. Upper thread holding mechanism. 請求項５乃至請求項７のいずれか１項記載のミシンの上糸保持機構において、
前記第２糸保持部材の前記保持位置を、前記糸孔が前記ミシンの釜糸案内部材に設けた下糸引き出し用の開口部の周囲の上方に位置するように、前記第２糸保持部材を前記針板に支持した
ことを特徴とするミシンの上糸保持機構。
In the upper thread holding mechanism of the sewing machine according to any one of claims 5 to 7,
The second thread holding member is positioned so that the thread hole is positioned above the lower thread drawing opening provided in the hook thread guide member of the sewing machine. An upper thread holding mechanism of a sewing machine supported by the needle plate.
JP2008057413A 2008-03-07 2008-03-07 Needle thread holding mechanism of sewing machine Pending JP2009213529A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2008057413A JP2009213529A (en) 2008-03-07 2008-03-07 Needle thread holding mechanism of sewing machine
CN2009100087659A CN101525822B (en) 2008-03-07 2009-03-06 Sewing machine face thread retaining device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2008057413A JP2009213529A (en) 2008-03-07 2008-03-07 Needle thread holding mechanism of sewing machine

Publications (1)

Publication Number Publication Date
JP2009213529A true JP2009213529A (en) 2009-09-24

Family

ID=41093884

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2008057413A Pending JP2009213529A (en) 2008-03-07 2008-03-07 Needle thread holding mechanism of sewing machine

Country Status (2)

Country Link
JP (1) JP2009213529A (en)
CN (1) CN101525822B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107620170A (en) * 2016-07-14 2018-01-23 天津宝盈电脑机械有限公司 Anti- " Bird's Nest " device of one kind

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011212137A (en) * 2010-03-31 2011-10-27 Brother Industries Ltd Sewing machine

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000325683A (en) * 1999-05-19 2000-11-28 Juki Corp Bird nest preventive device of sewing machine
JP4047624B2 (en) * 2002-05-14 2008-02-13 Ｊｕｋｉ株式会社 sewing machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107620170A (en) * 2016-07-14 2018-01-23 天津宝盈电脑机械有限公司 Anti- " Bird's Nest " device of one kind

Also Published As

Publication number Publication date
CN101525822B (en) 2012-10-31
CN101525822A (en) 2009-09-09

Similar Documents

Publication Publication Date Title
JP5042573B2 (en) sewing machine
JP5494598B2 (en) Method for preventing fraying of stitches, fraying prevention device for stitches, and stitch structure
US20130025517A1 (en) Multi-needle sewing machine
TWI527951B (en) Multi-head, multi-needle embroidery machine, multi-needle head for such a machine, thread cutter element and thread cutter for such a machine
JP6195752B2 (en) Sewing machine thread holding mechanism, sewing machine threading device, and sewing machine
JP2008068001A (en) Sewing machine
JP2017046758A (en) sewing machine
JP2008245731A (en) Sewing machine
JP2009095503A (en) Presser foot for sewing machine and sewing machine
JP2009061020A (en) Thread cutting apparatus for sewing machine
US7918171B2 (en) Threading device of sewing machine
JP6386241B2 (en) Sewing machine with threading device
JP2009011547A (en) Sewing machine
JP2008178455A (en) Thread cutter of sewing machine
JP2011245065A (en) Sewing machine with sequin feeding apparatus
JP2009213529A (en) Needle thread holding mechanism of sewing machine
EP2241662B1 (en) Thread cutting device for sewing machine
JP2008068005A (en) Sewing machine
JP2008142498A (en) Sewing machine with top cover thread mechanism
JP3872487B2 (en) Intermittent stitch sewing machine
JP2010227374A (en) Sewing machine
JP3994391B2 (en) Sewing machine and threading control program
JP5053824B2 (en) Sewing machine threading device
JP6099378B2 (en) Sewing machine with buttons
JP4898180B2 (en) Thread trimming device for chain stitch machine