JP2017080315A - Thread cutting mechanism and sewing machine - Google Patents

Thread cutting mechanism and sewing machine Download PDF

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JP2017080315A
JP2017080315A JP2015214891A JP2015214891A JP2017080315A JP 2017080315 A JP2017080315 A JP 2017080315A JP 2015214891 A JP2015214891 A JP 2015214891A JP 2015214891 A JP2015214891 A JP 2015214891A JP 2017080315 A JP2017080315 A JP 2017080315A
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blade
thread
cutting
moves
roller
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誠 大岡
Makoto Ooka
誠 大岡
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Brother Industries Ltd
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Brother Industries Ltd
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    • DTEXTILES; PAPER
    • D05SEWING; EMBROIDERING; TUFTING
    • D05BSEWING
    • D05B65/00Devices for severing the needle or lower thread

Abstract

PROBLEM TO BE SOLVED: To provide a thread cutting mechanism and a sewing machine which can shorten cut ends of a needle thread and a bobbin thread left on a sewing object after being cut.SOLUTION: When sewing is ended, a transmission member 130 moves forward and rotates a driving blade 120 counterclockwise in a bottom surface view to arrange it at a preparation position. A grooved cam 150 guides a roller member 165 of a driven blade 110 to a rear end part 152 and arranges the driven blade 110 at a separate position where a blade part 114 is separated from a needle hole 9A. When the transmission member 130 moves rearward, the grooved cam 150 guides the roller member 165 to an intermediate part 153 and arranges the driven blade 110 at an approach position where the blade part 114 is positioned at a needle hole 9A formation position. The driving blade 120 rotates clockwise in the bottom surface view and moves to a cutting position where a blade part 124 is positioned at the needle hole 9A formation position. The blade part 124 and the blade part 114 cross each other and cut a needle thread and a bobbin thread at the formation position of the needle hole 9A.SELECTED DRAWING: Figure 7

Description

本発明は、縫製終了後に糸を切断する糸切機構とミシンに関する。   The present invention relates to a thread cutting mechanism and a sewing machine for cutting a thread after completion of sewing.

ミシンは、縫製終了後に糸切機構を駆動し、上糸と下糸を切断する。特許文献1に記載のミシンの糸切機構は、固定刃と可動刃を備える。固定刃は針板下面に固定し、刃先を針穴の側方に配置する。可動刃は固定刃の下側に配置し、針板に段ネジで回動可能に取り付ける。可動刃はパルスモータと連結する。糸切り時、ミシンはパルスモータを駆動し、段ネジを中心に可動刃を回動する。可動刃は上糸と下糸を捕捉し、固定刃との間に挟んで切断する。   The sewing machine drives the thread trimming mechanism after the end of sewing and cuts the upper thread and the lower thread. The thread trimming mechanism of a sewing machine described in Patent Document 1 includes a fixed blade and a movable blade. The fixed blade is fixed to the lower surface of the needle plate, and the blade tip is arranged on the side of the needle hole. The movable blade is placed below the fixed blade and attached to the needle plate so as to be rotatable with a step screw. The movable blade is connected to a pulse motor. At the time of thread trimming, the sewing machine drives a pulse motor to rotate the movable blade around the step screw. The movable blade captures the upper thread and the lower thread and cuts them by sandwiching them between the fixed blade.

糸切機構は、針板上で布に縫目を形成した上糸と下糸を、針板の下側で切断する。故に、切断後の上糸と下糸は、布裏側の縫目形成位置から針穴を介して固定刃の刃先に至る経路の長さ分の切れ端を布に残す。   The thread trimming mechanism cuts an upper thread and a lower thread formed on the cloth on the needle plate at the lower side of the needle plate. Therefore, the upper thread and the lower thread after cutting leave a cut end corresponding to the length of the path from the stitch formation position on the cloth back side to the cutting edge of the fixed blade through the needle hole.

特開2006−314514号公報JP 2006-314514 A

切断後に布に残る上糸と下糸の切れ端を短くしたい要望がある。しかしながら、上記糸切機構の固定刃は針板下面に固定し、刃先を針穴の側方に配置するので、刃先から針穴まで距離がある。故に、布に残る上糸と下糸の切れ端は比較的長い。刃先から針穴まで距離を縮める為に刃先を上記糸切機構よりも針穴に近づけた状態で針板に固定刃を固定する場合、下糸は縫製時に固定刃に触れ、糸切れする可能性があった。故に、固定刃を針穴に近付けることができず、布に残る上糸と下糸の切れ端を短くすることは難しかった。   There is a desire to shorten the upper and lower thread ends that remain on the fabric after cutting. However, since the fixed blade of the thread cutting mechanism is fixed to the lower surface of the needle plate and the cutting edge is disposed on the side of the needle hole, there is a distance from the cutting edge to the needle hole. Therefore, the upper end and lower end of the thread remaining on the cloth are relatively long. When fixing the fixed blade to the needle plate with the blade tip closer to the needle hole than the above thread trimming mechanism to reduce the distance from the blade tip to the needle hole, the lower thread may touch the fixed blade during sewing and break the thread. was there. Therefore, the fixed blade could not be brought close to the needle hole, and it was difficult to shorten the upper thread and lower thread cut ends remaining on the cloth.

本発明の目的は、切断後に縫製対象物に残る上糸と下糸の切れ端を短くできる糸切機構とミシンを提供することである。   An object of the present invention is to provide a thread trimming mechanism and a sewing machine that can shorten the upper ends of upper and lower threads remaining on a sewing object after cutting.

本発明の第一態様によれば、縫針が通る針穴を有する針板の下側に設けた第一刃と、前記針板の下側に回動可能に設け、前記針穴から離れた位置に刃先を配置する待機位置と、前記針穴の形成位置において刃先が前記第一刃の刃先と交差する切断位置と、前記切断位置に対して前記待機位置とは反対側で、前記針穴から離れた位置に刃先を配置する準備位置との間で移動可能な第二刃と、動力源の駆動力を前記第二刃に伝達し、前記第二刃を前記待機位置と前記準備位置との間で移動する伝達部材と、を備え、前記第二刃は、前記動力源の駆動によって前記伝達部材を介して前記待機位置から前記準備位置に移動した後、前記準備位置から前記切断位置に移動し、前記第二刃が前記準備位置から前記切断位置に移動する時、上糸と下糸を捕捉し且つ前記第一刃との協働で切断する糸切機構において、前記第一刃は、刃先が前記針穴の形成位置に配置する接近位置と前記接近位置に対し前記針穴から離間した離間位置との間で移動可能であり、前記伝達部材と共に前記動力源の駆動力で作動し、前記第一刃を前記接近位置と前記離間位置との間で移動する移動機構を備え、前記動力源の非駆動時、前記第一刃は前記離間位置に位置し、且つ前記第二刃は前記待機位置に位置し、前記動力源の駆動時、前記伝達部材によって前記第二刃が前記準備位置から前記切断位置に移動する場合、前記移動機構は、前記第一刃を前記離間位置から前記接近位置に移動することを特徴とする糸切機構が提供される。   According to the first aspect of the present invention, a first blade provided on the lower side of a needle plate having a needle hole through which a sewing needle passes, a position provided on the lower side of the needle plate so as to be rotatable, and a position away from the needle hole From the needle hole on the opposite side of the standby position to the cutting position, the cutting position where the cutting edge intersects the cutting edge of the first blade at the needle hole forming position, A second blade movable between a preparation position for disposing the cutting edge at a distant position, a driving force of a power source is transmitted to the second blade, and the second blade is moved between the standby position and the preparation position. And the second blade moves from the standby position to the preparation position via the transmission member by driving the power source, and then moves from the preparation position to the cutting position. When the second blade moves from the preparation position to the cutting position, the upper thread and the lower thread are captured. In the thread trimmer mechanism that cuts in cooperation with the first blade, the first blade has an approach position where the blade tip is disposed at the formation position of the needle hole and a spaced position separated from the needle hole with respect to the approach position. A moving mechanism for moving the first blade between the approaching position and the separating position, and operating with the driving force of the power source together with the transmission member. When not driven, the first blade is located at the separation position, and the second blade is located at the standby position.When the power source is driven, the transmission member causes the second blade to move from the preparation position. When moving to the cutting position, the moving mechanism moves the first blade from the separated position to the approach position, and a thread cutting mechanism is provided.

縫製時、第一刃と第二刃は刃先を針穴から離れた位置に配置する。上糸と下糸が刃先に接触し難くなるので、糸切機構は、糸切れの可能性を低減できる。糸切り時、第一刃と第二刃は刃先を針穴の形成位置で交差し、上糸と下糸を切断する。故に糸切機構は、針穴から離れた位置で上糸と下糸を切断した場合と比べ、縫製対象物に残る上糸と下糸の切れ端を短くできる。   At the time of sewing, the first blade and the second blade are arranged with their cutting edges away from the needle holes. Since the upper thread and the lower thread are less likely to contact the blade edge, the thread trimming mechanism can reduce the possibility of thread breakage. At the time of thread trimming, the first blade and the second blade intersect the cutting edge at the formation position of the needle hole and cut the upper thread and the lower thread. Therefore, the thread trimming mechanism can shorten the upper thread and lower thread cut ends remaining on the sewing object as compared with the case where the upper thread and the lower thread are cut at a position away from the needle hole.

第一態様では、前記動力源の駆動時、前記伝達部材は、水平方向と平行な所定方向に往復移動して前記第二刃を前記待機位置と前記準備位置との間で往復移動し、前記移動機構は、前記伝達部材と一体に設け、前記所定方向と交差する方向に屈曲する屈曲部分を有し且つ前記所定方向に沿って溝状に延びる溝カムと、前記第一刃に設け、且つ前記溝カムに嵌合するコロ部材と、を含み、前記伝達部材の移動によって前記第二刃が前記待機位置又は前記準備位置に位置する時、前記コロ部材は前記溝カムの端部に位置して前記第一刃を前記離間位置に配置し、前記第二刃が前記切断位置に位置する時、前記コロ部材は前記溝カムの屈曲部分に位置して前記第一刃を前記接近位置に配置してもよい。   In the first aspect, when the power source is driven, the transmission member reciprocates in a predetermined direction parallel to a horizontal direction to reciprocate the second blade between the standby position and the preparation position, A moving mechanism provided integrally with the transmission member, having a bent portion bent in a direction intersecting the predetermined direction and extending in a groove shape along the predetermined direction; provided on the first blade; and A roller member fitted to the groove cam, and when the second blade is positioned at the standby position or the preparation position by movement of the transmission member, the roller member is positioned at an end of the groove cam. When the first blade is disposed at the separated position and the second blade is disposed at the cutting position, the roller member is disposed at the bent portion of the groove cam and the first blade is disposed at the approach position. May be.

移動機構は溝カムとコロ部材であり、コロ部材が溝カムに嵌合するので、コロ部材がカム面から離れない。即ち、カム面とコロ部材の係合を維持する為にコロ部材をカム面に押しつける力は不要である。故に移動機構は、例えば付勢部材が不要の構成であるので、部品点数を削減することができる。   The moving mechanism is a groove cam and a roller member. Since the roller member is fitted to the groove cam, the roller member is not separated from the cam surface. That is, no force is required to press the roller member against the cam surface in order to maintain the engagement between the cam surface and the roller member. Therefore, since the moving mechanism has a configuration that does not require an urging member, for example, the number of parts can be reduced.

第一態様では、前記第一刃と前記第二刃は平板状であり、前記針板に設け、前記第一刃と前記第二刃を同軸で軸方向に重ねて配置し、夫々回動可能に支持する軸部を備え、前記伝達部材が前記所定方向に往復移動する時、前記伝達部材によって前記軸部を中心に回動する前記第二刃の刃先の回動軌跡は、前記移動機構によって回動する前記第一刃の刃先の回動軌跡と重なる位置を含み、前記第一刃が前記接近位置に位置し且つ前記第二刃が前記切断位置に位置する時、前記第二刃の刃先は前記第一刃の刃先と交差してもよい。   In the first aspect, the first blade and the second blade have a flat plate shape, are provided on the needle plate, and the first blade and the second blade are coaxially arranged in an axial direction and can be rotated respectively. When the transmission member reciprocates in the predetermined direction, the rotation locus of the cutting edge of the second blade that rotates about the shaft portion by the transmission member is caused by the movement mechanism. Including a position that overlaps the rotation trajectory of the cutting edge of the first blade that rotates, and when the first blade is positioned at the approach position and the second blade is positioned at the cutting position, the cutting edge of the second blade May intersect the cutting edge of the first blade.

第一刃と第二刃を回動可能に支持する軸部は一つで足りる。故に糸切機構は、部品点数を削減することができる。   A single shaft is sufficient to support the first blade and the second blade in a rotatable manner. Therefore, the thread trimming mechanism can reduce the number of parts.

第一態様は、前記針板に設け、前記第二刃を回動可能に支持する軸部と、前記第一刃を、前記接近位置から前記離間位置へ向けて付勢する第一付勢部材と、を備え、前記移動機構は、前記軸部を中心に前記第二刃と共に回動可能に設け、前記軸部の径方向外側を向き周方向に延びるカム面及び前記カム面の前記周方向の一部に前記径方向外向きに突出する突部を有する外周カムと、前記外周カムの前記カム面に沿って転動可能なコロ部材と、前記針板に設けた軸体が回動可能に支持し、一端に前記コロ部材を設け、他端に前記第一刃を接続するリンク部材と、を含み、前記第一付勢部材は前記リンク部材を介し、前記コロ部材を前記カム面に対して押圧し、前記動力源の駆動時、前記伝達部材は、水平方向と平行な所定方向に往復移動して前記第二刃を前記待機位置と前記準備位置との間で往復移動し、前記伝達部材の移動によって前記第二刃が前記待機位置又は前記準備位置に位置する時、前記コロ部材は前記カム面の内前記突部以外の部分に当接して前記第一刃を前記離間位置に配置し、前記第二刃が前記切断位置に位置する時、前記コロ部材は前記カム面の内前記突部に当接して前記第一刃を前記接近位置に配置してもよい。   In the first aspect, a shaft portion that is provided on the needle plate and rotatably supports the second blade, and a first urging member that urges the first blade from the approach position toward the separation position. The moving mechanism is provided so as to be rotatable together with the second blade about the shaft portion, and extends in a circumferential direction facing a radially outer side of the shaft portion, and the circumferential direction of the cam surface An outer peripheral cam having a protrusion projecting outward in the radial direction at a part thereof, a roller member capable of rolling along the cam surface of the outer peripheral cam, and a shaft provided on the needle plate is rotatable. And a link member that connects the first blade to the other end, the first biasing member via the link member, and the roller member on the cam surface. When the power source is driven, the transmission member moves back and forth in a predetermined direction parallel to the horizontal direction. When the second blade is reciprocated between the standby position and the preparation position, and the second blade is positioned at the standby position or the preparation position by the movement of the transmission member, the roller member moves toward the cam surface. When the first blade is disposed at the separated position in contact with a portion other than the inner protrusion, and the second blade is positioned at the cutting position, the roller member contacts the inner protrusion of the cam surface. The first blade may be disposed in contact with the approaching position.

移動機構は外周カムとコロ部材である。外周カムは形成が容易であり、且つ耐久性が高い。故に糸切機構は長期に亘って確実に動作することができる。   The moving mechanism is an outer peripheral cam and a roller member. The outer peripheral cam is easy to form and has high durability. Therefore, the thread trimming mechanism can operate reliably over a long period of time.

第一態様では、前記移動機構は、前記コロ部材を前記軸部の軸線方向の一方側に付勢する第二付勢部材を含み、前記突部は、前記カム面の前記軸線方向の一方側に突出し、且つ前記軸線方向他方側を向く面が前記軸部の周方向の一端側から他端側に向けて前記軸線方向の一方側から他方側に傾斜する傾斜面を形成し、前記第二刃が前記待機位置から前記準備位置に移動する時、前記コロ部材は前記軸部の周方向の一端側から他端側へ向けて前記傾斜面に沿って前記突部の前記軸線方向他方側を移動して、前記第一刃を前記第一付勢部材の付勢で前記離間位置に配置し、前記第二刃が前記準備位置から前記切断位置に移動する時、前記コロ部材は前記軸部の周方向の他端側から一端側へ向けて前記突部に沿って移動して、前記リンク部材を介し前記第一刃を前記離間位置から前記接近位置に移動してもよい。   In the first aspect, the moving mechanism includes a second urging member that urges the roller member to one side in the axial direction of the shaft portion, and the protrusion is one side in the axial direction of the cam surface. And a surface facing toward the other side in the axial direction forms an inclined surface that is inclined from one side in the axial direction toward the other side toward the other end side in the circumferential direction of the shaft portion, When the blade moves from the standby position to the preparation position, the roller member moves the other axial side of the protrusion along the inclined surface from one end side to the other end side in the circumferential direction of the shaft portion. When the second blade moves from the preparation position to the cutting position when the first blade is moved and arranged at the separated position by the bias of the first biasing member, the roller member moves to the shaft portion. Moving along the protrusion from the other end side in the circumferential direction toward the one end side through the link member The serial first blade may be moved to the approaching position from the spaced position.

第二刃が待機位置から準備位置に移動する時にコロ部材を案内するカム面は、突部を含まない。コロ部材は突部に当接しないので、第一刃を離間位置に維持する。故に糸切機構は、第二刃が切断位置で上糸と下糸を切断する前に、第一刃の刃先が上糸と下糸に触れて切断することを防止できる。   The cam surface that guides the roller member when the second blade moves from the standby position to the preparation position does not include a protrusion. Since the roller member does not contact the protrusion, the first blade is maintained at the separated position. Therefore, the thread cutting mechanism can prevent the cutting edge of the first blade from coming into contact with the upper thread and the lower thread before cutting the upper thread and the lower thread at the cutting position.

第一態様では、前記針板は、前記第一刃の移動を直線状に案内する案内部を備え、前記リンク部材は、前記他端に、前記第一刃に設けたピンに係合する長穴を有し、前記リンク部材の回動によって前記長穴の範囲内で前記ピンが移動し、前記第一刃を前記離間位置と前記接近位置との間で直線状に移動する動力に変換してもよい。   In the first aspect, the needle plate includes a guide portion that linearly guides the movement of the first blade, and the link member has a length that engages with a pin provided on the first blade at the other end. The pin has a hole, and the pin moves in the range of the elongated hole by the rotation of the link member, and the first blade is converted into power that moves linearly between the separation position and the approach position. May be.

第一刃は直線状に移動するので、上糸と下糸を切断するとき、第二刃に向ける刃先の角度を一定に保つことができる。故に糸切機構は、安定した糸切りを行うことができる。   Since the first blade moves linearly, when cutting the upper thread and the lower thread, the angle of the blade edge directed toward the second blade can be kept constant. Therefore, the thread trimming mechanism can perform stable thread trimming.

第一態様では、前記外周カムは、前記軸部の周方向に延びる穴部を有し、前記第二刃は、前記第二刃と前記外周カムとを一体に固定する固定部材を有し、前記外周カムは、前記穴部の範囲内で前記第二刃に対する固定位置を変更して前記固定部材で固定可能であってもよい。   In the first aspect, the outer circumferential cam has a hole extending in the circumferential direction of the shaft portion, and the second blade has a fixing member that integrally fixes the second blade and the outer circumferential cam, The outer peripheral cam may be fixed by the fixing member by changing a fixing position with respect to the second blade within the range of the hole.

第二刃は、穴部内での固定部材の位置に応じて外周カムとの位置関係を調整することで、糸切り時に第一刃と噛み合う位置を調整できる。   The position where the second blade meshes with the first blade during thread trimming can be adjusted by adjusting the positional relationship with the outer peripheral cam in accordance with the position of the fixing member in the hole.

第一態様は、前記第一刃を、前記接近位置から前記離間位置へ向けて付勢する第一付勢部材と、前記針板に設け、前記第二刃を回動可能に支持する軸部を備え、前記移動機構は、前記第二刃に設け且つ前記軸部の径方向外向きに突出し、前記伝達部材と共に動作するコロ部材と、前記針板に設けた上流支軸を中心に回動可能な上流回動部材と、前記針板に設けた下流支軸を中心に回動可能な下流回動部材と、を含み、前記上流回動部材は、前記上流支軸の径方向外向きに突出し、前記コロ部材に当接可能なコロ突出部と、前記コロ突出部とは異なる方向の径方向外向きに突出する作用突出部とを有し、前記下流回動部材は、一端部が前記作用突出部に当接可能であり、他端部が前記第一刃に接続し、前記第二刃が前記待機位置から前記準備位置に移動する時、前記作用突出部は前記下流回動部材の前記一端部から離れる向きに前記コロ突出部を押圧し、前記第一刃は前記第一付勢部材の付勢で前記離間位置に配置し、前記第二刃が前記準備位置から前記切断位置に移動する時、前記作用突出部は前記下流回動部材の前記一端部に当接する向きに前記コロ突出部を押圧し、前記第一刃は前記作用突出部と前記下流回動部材を介して前記離間位置から前記接近位置に移動してもよい。   The first aspect includes a first biasing member that biases the first blade from the approach position toward the separation position, and a shaft portion that is provided on the needle plate and rotatably supports the second blade. The moving mechanism is provided on the second blade and protrudes outward in the radial direction of the shaft portion, and rotates about a roller member that operates together with the transmission member and an upstream support shaft provided on the needle plate. A possible upstream rotating member, and a downstream rotating member rotatable about a downstream support shaft provided on the needle plate, the upstream rotating member being radially outward of the upstream support shaft. A roller protrusion that protrudes and is capable of contacting the roller member; and an action protrusion that protrudes radially outward in a direction different from the roller protrusion. The other end is connected to the first blade, and the second blade is moved from the standby position to the preparation position. When moving to the position, the action protrusion presses the roller protrusion in a direction away from the one end of the downstream rotating member, and the first blade is moved to the separated position by the bias of the first biasing member. When the second blade moves from the preparation position to the cutting position, the action protrusion presses the roller protrusion in a direction to contact the one end of the downstream rotating member, The blade may move from the separated position to the approach position via the action protrusion and the downstream rotating member.

第二刃が準備位置から切断位置に移動する時、コロ部材が上流回動部材を回動しても作用突出部は下流回動部材に接触しない。よって下流回動部材は回動せず、第一刃を離間位置に維持する。故に糸切機構は、第二刃が切断位置で上糸と下糸を切断する前に、第一刃の刃先が上糸と下糸に触れて切断することを防止できる。   When the second blade moves from the preparation position to the cutting position, even if the roller member rotates the upstream rotation member, the action protrusion does not contact the downstream rotation member. Therefore, the downstream rotating member does not rotate, and the first blade is maintained at the separated position. Therefore, the thread cutting mechanism can prevent the cutting edge of the first blade from coming into contact with the upper thread and the lower thread before cutting the upper thread and the lower thread at the cutting position.

第一態様では、前記針板は、前記第一刃の移動を直線状に案内する案内部を備え、前記移動機構は、前記第一刃を前記離間位置と前記接近位置との間で直線状に移動してもよい。   In the first aspect, the needle plate includes a guide portion that linearly guides the movement of the first blade, and the moving mechanism linearly moves the first blade between the separation position and the approach position. You may move on.

第一刃は直線状に移動するので、上糸と下糸を切断するとき、第二刃に向ける刃先の角度を一定に保つことができる。故に糸切機構は、安定した糸切りを行うことができる。   Since the first blade moves linearly, when cutting the upper thread and the lower thread, the angle of the blade edge directed toward the second blade can be kept constant. Therefore, the thread trimming mechanism can perform stable thread trimming.

第一態様では、前記下流回動部材は、前記下流支軸を中心に回動可能であり、前記一端部と前記下流支軸との間に延びる第一部材と、前記下流支軸を中心に回動可能であり、前記他端部と前記下流支軸との間に延びる第二部材と、を備え、前記第一部材は、前記一端部と前記下流支軸との間に長穴である調整穴を有し、前記第二部材は、前記調整穴に係合して前記第一部材に組み付ける組付部材を有し、前記下流回動部材は、前記調整穴の範囲内で前記組付部材の組み付け位置を変更して前記第一部材と前記第二部材を組み付け可能であってもよい。   In the first aspect, the downstream rotation member is rotatable about the downstream support shaft, the first member extending between the one end portion and the downstream support shaft, and the downstream support shaft. A second member that is rotatable and extends between the other end portion and the downstream support shaft, wherein the first member is an elongated hole between the one end portion and the downstream support shaft. The second member has an assembly member that engages with the adjustment hole and is assembled to the first member, and the downstream rotation member is assembled within the range of the adjustment hole. It may be possible to assemble the first member and the second member by changing the assembly position of the member.

下流回動部材は、調整穴内での組付部材の位置に応じて第一部材と第二部材との位置関係を調整することで、糸切り時に第一刃と第二刃とが噛み合う位置を調整できる。   The downstream rotating member adjusts the positional relationship between the first member and the second member in accordance with the position of the assembly member within the adjustment hole, so that the position where the first blade and the second blade mesh with each other during thread trimming. Can be adjusted.

本発明の第二態様によれば、縫針が通る針穴を有する針板の下側に設けた第一刃と、前記針板の下側に回動可能に設け、前記針穴から離れた位置に刃先を配置する待機位置と、前記針穴の形成位置において刃先が前記第一刃の刃先と交差する切断位置と、前記切断位置に対して前記待機位置とは反対側で、前記針穴から離れた位置に刃先を配置する準備位置との間で移動可能な第二刃と、動力源の駆動力を前記第二刃に伝達し、前記第二刃を前記待機位置と前記準備位置との間で移動する伝達部材と、を備え、前記第二刃は、前記動力源の駆動によって前記伝達部材を介して前記待機位置から前記準備位置に移動した後、前記準備位置から前記切断位置に移動し、前記第二刃が前記準備位置から前記切断位置に移動する時、上糸と下糸を捕捉し且つ前記第一刃との協働で切断する糸切機構を備えたミシンにおいて、前記第一刃は、刃先が前記針穴の形成位置に配置する接近位置と前記接近位置に対し前記針穴から離間した離間位置との間で移動可能であり、前記糸切機構は、前記伝達部材と共に前記動力源の駆動力で作動し、前記第一刃を前記接近位置と前記離間位置との間で移動する移動機構を備え、前記動力源の非駆動時、前記第一刃は前記離間位置に位置し、且つ前記第二刃は前記待機位置に位置し、前記動力源の駆動時、前記伝達部材によって前記第二刃が前記準備位置から前記切断位置に移動する場合、前記移動機構は、前記第一刃を前記離間位置から前記接近位置に移動することを特徴とするミシンが提供される。   According to the second aspect of the present invention, the first blade provided on the lower side of the needle plate having a needle hole through which the sewing needle passes, and the position provided at the lower side of the needle plate so as to be rotatable and away from the needle hole. From the needle hole on the opposite side of the standby position to the cutting position, the cutting position where the cutting edge intersects the cutting edge of the first blade at the needle hole forming position, A second blade movable between a preparation position for disposing the cutting edge at a distant position, a driving force of a power source is transmitted to the second blade, and the second blade is moved between the standby position and the preparation position. And the second blade moves from the standby position to the preparation position via the transmission member by driving the power source, and then moves from the preparation position to the cutting position. When the second blade moves from the preparation position to the cutting position, the upper thread and the lower thread are captured. In the sewing machine provided with a thread cutting mechanism that cuts in cooperation with the first blade, the first blade has an approach position where the blade tip is disposed at the formation position of the needle hole and the approach position from the needle hole. The thread cutting mechanism is movable with the transmission member and the driving force of the power source to move the first blade between the approach position and the separation position. The first blade is located at the separation position and the second blade is located at the standby position when the power source is not driven, and the transmission member is used when the power source is driven. When the second blade moves from the preparation position to the cutting position, the moving mechanism moves the first blade from the separated position to the approach position.

縫製時、第一刃と第二刃は刃先を針穴から離れた位置に配置する。上糸と下糸が刃先に接触し難くなるので、糸切機構は、糸切れの可能性を低減できる。糸切り時、第一刃と第二刃は刃先を針穴の形成位置で交差し、上糸と下糸を切断する。故にミシンは、針穴から離れた位置で上糸と下糸を切断した場合と比べ、縫製対象物に残る上糸と下糸の切れ端を短くできる。   At the time of sewing, the first blade and the second blade are arranged with their cutting edges away from the needle holes. Since the upper thread and the lower thread are less likely to contact the blade edge, the thread trimming mechanism can reduce the possibility of thread breakage. At the time of thread trimming, the first blade and the second blade intersect the cutting edge at the formation position of the needle hole and cut the upper thread and the lower thread. Therefore, the sewing machine can shorten the upper thread and lower thread cut ends remaining on the sewing object as compared with the case where the upper thread and the lower thread are cut away from the needle hole.

ミシン1の斜視図である。1 is a perspective view of a sewing machine 1. FIG. ミシン1の右側面図である。2 is a right side view of the sewing machine 1. FIG. ミシン1の背面図である。2 is a rear view of the sewing machine 1. FIG. 駆動刃120が待機位置にある時の糸切機構100の底面図である。It is a bottom view of the thread trimming mechanism 100 when the driving blade 120 is in the standby position. 針板9と駆動機構15の斜視図である。3 is a perspective view of a needle plate 9 and a drive mechanism 15. FIG. 駆動刃120が準備位置にある時の糸切機構100の底面図である。It is a bottom view of the thread trimming mechanism 100 when the driving blade 120 is in the preparation position. 駆動刃120が切断位置にある時の糸切機構100の底面図である。It is a bottom view of the thread trimming mechanism 100 when the driving blade 120 is in the cutting position. 駆動刃220が待機位置にある時の糸切機構200の底面図である。It is a bottom view of the thread trimming mechanism 200 when the driving blade 220 is in the standby position. カム部材270の斜視図である。5 is a perspective view of a cam member 270. FIG. 図9の矢印A方向に見たカム部材270の側面図である。It is the side view of the cam member 270 seen in the arrow A direction of FIG. 駆動刃220が待機位置から準備位置に移動する時の糸切機構200の底面図である。It is a bottom view of the thread trimming mechanism 200 when the driving blade 220 moves from the standby position to the preparation position. 駆動刃220が準備位置にある時の糸切機構200の底面図である。It is a bottom view of the thread trimming mechanism 200 when the driving blade 220 is in the preparation position. 駆動刃220が切断位置にある時の糸切機構200の底面図である。It is a bottom view of the thread trimming mechanism 200 when the driving blade 220 is in the cutting position. 駆動刃320が待機位置にある時の糸切機構300の底面図である。It is a bottom view of the thread trimming mechanism 300 when the driving blade 320 is in the standby position. 駆動刃320が待機位置から準備位置に移動する時の糸切機構300の底面図である。It is a bottom view of the thread trimming mechanism 300 when the driving blade 320 moves from the standby position to the preparation position. 駆動刃320が準備位置にある時の糸切機構300の底面図である。It is a bottom view of the thread trimming mechanism 300 when the driving blade 320 is in the preparation position. 駆動刃320が切断位置にある時の糸切機構300の底面図である。It is a bottom view of the thread trimming mechanism 300 when the driving blade 320 is in the cutting position.

本発明の第一実施形態を説明する。以下説明は、図中に矢印で示す左右、前後、上下を使用する。   A first embodiment of the present invention will be described. In the following description, left, right, front, back, and top and bottom indicated by arrows in the figure are used.

ミシン1の全体構造を説明する。図1〜図3に示すように、ミシン1は布に閂止縫目を形成する閂止ミシンである。ミシン1は、ベッド部2、脚柱部3、アーム部4を備える。ベッド部2は前後方向に延び、内部に垂直釜8、送り台(図示略)、布送り機構(図示略)等を備える。ベッド部2は、針板9を備える。針板9は、前端部上面に針穴9A(図5参照)を有する。送り板11は針板9上に位置し、送り台に固定する。   The overall structure of the sewing machine 1 will be described. As shown in FIGS. 1 to 3, the sewing machine 1 is a tacking sewing machine that forms tacking stitches on a cloth. The sewing machine 1 includes a bed portion 2, a pedestal column portion 3, and an arm portion 4. The bed portion 2 extends in the front-rear direction, and includes a vertical shuttle 8, a feed base (not shown), a cloth feed mechanism (not shown), and the like. The bed unit 2 includes a needle plate 9. The needle plate 9 has a needle hole 9A (see FIG. 5) on the upper surface of the front end portion. The feed plate 11 is located on the needle plate 9 and is fixed to the feed base.

脚柱部3はベッド部2後側から上方に延び、背壁上部にミシンモータ91を備える。アーム部4は、脚柱部3上端からベッド部2と略平行に前方に延び、内部にミシンモータ91で駆動する主軸を備える。アーム部4の前端部5は、アーム部4の他部位よりも下方へ突出する。前端部5は、内部に針棒6を上下動可能に支持する。針棒6は前端部5下端から下方へ延びる。縫針7は針棒6下端に着脱可能であり、針棒6と共に主軸の駆動で上下方向に駆動する。   The pedestal 3 extends upward from the rear side of the bed 2 and includes a sewing machine motor 91 on the back wall. The arm portion 4 extends forward from the upper end of the pillar portion 3 substantially parallel to the bed portion 2 and includes a main shaft that is driven by a sewing machine motor 91 inside. The front end portion 5 of the arm portion 4 projects downward from other portions of the arm portion 4. The front end portion 5 supports the needle bar 6 so as to be movable up and down. The needle bar 6 extends downward from the lower end of the front end portion 5. The sewing needle 7 is detachably attached to the lower end of the needle bar 6 and is driven in the vertical direction together with the needle bar 6 by driving the main shaft.

ミシン1はベッド部2上部に布押え装置10を備える。布押え装置10は押え足12を備える。押え足12は針板9上方に位置する。布押え装置10は押え足12を昇降し、縫製対象物である布を上方から押える。布押え装置10は布押え用モータ(図示略)で駆動する。布押え用モータは脚柱部3内部に設ける。   The sewing machine 1 is provided with a presser foot device 10 at the top of the bed portion 2. The presser foot device 10 includes a presser foot 12. The presser foot 12 is positioned above the needle plate 9. The presser foot device 10 raises and lowers the presser foot 12 and presses the cloth as a sewing object from above. The presser foot device 10 is driven by a presser foot motor (not shown). The presser foot motor is provided inside the pedestal 3.

布送り機構は、X送り用モータ(図示略)とY送り用モータ(図示略)を備える。布送り機構はX送り用モータとY送り用モータを駆動することで、布押え装置10、送り板11、送り台をX方向(左右方向)とY方向(前後方向)に移動する。ミシン1は縫針7の上下動に合わせて布をX方向とY方向に送り、布に閂止縫目を形成する。   The cloth feed mechanism includes an X feed motor (not shown) and a Y feed motor (not shown). The cloth feed mechanism drives the X feed motor and the Y feed motor to move the cloth presser device 10, the feed plate 11, and the feed base in the X direction (left-right direction) and the Y direction (front-back direction). The sewing machine 1 feeds the cloth in the X direction and the Y direction in accordance with the vertical movement of the sewing needle 7, and forms a tack seam on the cloth.

図4に示すように、ミシン1は針板9の下面側に、糸切機構100と糸掴み機構40を備える。糸切機構100は、縫製動作終了時、上糸と下糸の切断動作を行う。糸掴み機構40は縫製開始時の一針目で布の下方に通過した上糸を屈曲して保持し、縫針7からの糸抜けを防止する。図1〜図3に示すように、ミシン1はベッド部2の背面側にブラケット80を介して糸切用モータ95を固定する。糸切用モータ95はパルスモータであり、糸切機構100と糸掴み機構40の駆動源である。   As shown in FIG. 4, the sewing machine 1 includes a thread trimming mechanism 100 and a thread gripping mechanism 40 on the lower surface side of the needle plate 9. The thread trimming mechanism 100 performs an upper thread and lower thread cutting operation at the end of the sewing operation. The thread gripping mechanism 40 bends and holds the upper thread that has passed below the cloth at the first stitch at the start of sewing, and prevents the thread from coming out of the sewing needle 7. As shown in FIGS. 1 to 3, the sewing machine 1 fixes a thread trimming motor 95 to the back side of the bed portion 2 via a bracket 80. The thread trimming motor 95 is a pulse motor and is a drive source for the thread trimming mechanism 100 and the thread gripping mechanism 40.

以下の説明で、糸切機構100を構成する各部材の方向の説明は、駆動刃120が待機位置(図4参照)に位置する時の向きで説明する。図4に示すように、糸切機構100は従動刃110、駆動刃120、伝達部材130、移動機構160を備える。従動刃110は底面視略L字状の板材で、一端部111が左方に延び、他端部112が右斜め前方に延びる。従動刃110はL字の屈曲部分に軸穴(図示略)を有する。軸穴は支軸9Bに係合する。支軸9Bは針板9下面に設け、従動刃110を水平に往復回動可能に支持する。従動刃110は、刃部114を備える。刃部114は、一端部111の後方に突出する部分に形成する。支軸9Bと刃部114との距離は、支軸9Bと針穴9Aの形成位置との距離と略同じである。従動刃110が回動する時、刃部114は支軸9Bを中心とする円弧状の軌跡を移動する。刃部114の移動軌跡は針穴9Aの形成位置を含む。従動刃110は、円柱状のコロ部材165を備える。コロ部材165は他端部112に設け、下方に突出する。   In the following description, the direction of each member constituting the thread trimming mechanism 100 will be described in the direction when the driving blade 120 is positioned at the standby position (see FIG. 4). As shown in FIG. 4, the thread cutting mechanism 100 includes a driven blade 110, a driving blade 120, a transmission member 130, and a moving mechanism 160. The driven blade 110 is a substantially L-shaped plate material as viewed from the bottom, with one end 111 extending leftward and the other end 112 extending diagonally forward right. The driven blade 110 has a shaft hole (not shown) in an L-shaped bent portion. The shaft hole engages with the support shaft 9B. The support shaft 9B is provided on the lower surface of the needle plate 9, and supports the driven blade 110 so as to be horizontally reciprocally rotatable. The driven blade 110 includes a blade portion 114. The blade portion 114 is formed in a portion protruding rearward from the one end portion 111. The distance between the support shaft 9B and the blade portion 114 is substantially the same as the distance between the support shaft 9B and the formation position of the needle hole 9A. When the driven blade 110 rotates, the blade portion 114 moves along an arc-shaped locus centering on the support shaft 9B. The movement trajectory of the blade portion 114 includes the formation position of the needle hole 9A. The driven blade 110 includes a cylindrical roller member 165. The roller member 165 is provided at the other end 112 and protrudes downward.

駆動刃120の形状は、左右方向に延びる板状である。駆動刃120は中間部分に、支軸9Bに係合する軸穴(図示略)を有する。支軸9Bは、駆動刃120を水平に往復回動可能に支持する。即ち支軸9Bは、従動刃110と駆動刃120を同軸で回動可能に支持する。駆動刃120は、従動刃110の下側に配置する。従動刃110と駆動刃120の間には、円環状の座金107を配置する。座金107は支軸9Bに係合する。従動刃110の刃部114と駆動刃120の刃部124の間隙は、厚みの異なる座金107又は複数の座金107を配置することで調整可能である。   The shape of the driving blade 120 is a plate shape extending in the left-right direction. The drive blade 120 has a shaft hole (not shown) that engages with the support shaft 9B in an intermediate portion. The support shaft 9B supports the drive blade 120 so as to be horizontally reciprocally rotatable. That is, the support shaft 9B supports the driven blade 110 and the driving blade 120 so as to be rotatable coaxially. The driving blade 120 is disposed below the driven blade 110. An annular washer 107 is disposed between the driven blade 110 and the driving blade 120. The washer 107 engages with the support shaft 9B. The gap between the blade portion 114 of the driven blade 110 and the blade portion 124 of the driving blade 120 can be adjusted by arranging a washer 107 or a plurality of washers 107 having different thicknesses.

駆動刃120は一端部121、他端部122を備える。一端部121は軸穴の左方に延び、他端部122は軸穴の右方に延びる。一端部121は、糸捌き部123、刃部124、糸係合部125、糸案内部126、糸捕捉部127を有する。糸捌き部123は、縫製時に縫針7が針板9下側で形成する上糸の上糸環(図示略)内に進入する部分である。刃部124は駆動刃120を上下方向に貫通する貫通穴の端部である。支軸9Bと刃部124との距離は、支軸9Bと針穴9Aの形成位置との距離と略同じである。駆動刃120が回動する時、刃部124は支軸9Bを中心とする円弧状の軌跡を移動する。刃部124の移動軌跡は針穴9Aの形成位置を通る。糸係合部125は上糸環のうち縫針7から延びる側を引掛ける部分である。糸案内部126は糸捌き部123と糸捕捉部127の間で湾曲する部分であり、上糸環のうち布から延びる側を糸捕捉部127に案内する。糸捕捉部127は上糸環を捕捉する部分である。他端部122は、下方に突出するピン119を備える。ピン119は、伝達部材130の先端部131に回動可能に連結する。   The driving blade 120 includes one end 121 and the other end 122. One end 121 extends to the left of the shaft hole, and the other end 122 extends to the right of the shaft hole. The one end portion 121 includes a threading portion 123, a blade portion 124, a thread engaging portion 125, a yarn guiding portion 126, and a yarn catching portion 127. The threading portion 123 is a portion that enters the upper thread ring (not shown) of the upper thread formed by the sewing needle 7 below the needle plate 9 at the time of sewing. The blade portion 124 is an end portion of a through hole that penetrates the drive blade 120 in the vertical direction. The distance between the support shaft 9B and the blade portion 124 is substantially the same as the distance between the support shaft 9B and the formation position of the needle hole 9A. When the driving blade 120 rotates, the blade portion 124 moves along an arcuate locus centering on the support shaft 9B. The movement locus of the blade portion 124 passes through the formation position of the needle hole 9A. The thread engaging portion 125 is a portion that hooks the side of the upper thread ring that extends from the sewing needle 7. The yarn guide portion 126 is a portion that is curved between the yarn winding portion 123 and the yarn catching portion 127, and guides the side of the upper thread ring that extends from the cloth to the yarn catching portion 127. The thread catcher 127 is a part that catches the upper thread ring. The other end 122 includes a pin 119 protruding downward. The pin 119 is rotatably connected to the distal end portion 131 of the transmission member 130.

伝達部材130の形状は、前後方向に長く延びる板状である。伝達部材130の先端部131は、右方に弧状に屈曲する部分を有する。先端部131は、上下方向に貫通する貫通穴133を有する。駆動刃120のピン119は、貫通穴133に係合する。糸切機構100の動作時、伝達部材130は前後方向に往復移動する。該時、貫通穴133は、支軸9Bの右斜め後方と右斜め前方との間で支軸9Bを中心とする円弧状に往復移動する。先端部131の屈曲部分は、前方への移動時に支軸9Bの右方に位置し、先端部131と支軸9Bの接触を避ける。   The shape of the transmission member 130 is a plate shape that extends long in the front-rear direction. The distal end portion 131 of the transmission member 130 has a portion that is bent in an arc shape to the right. The tip 131 has a through hole 133 that penetrates in the vertical direction. The pin 119 of the driving blade 120 engages with the through hole 133. During operation of the thread trimmer mechanism 100, the transmission member 130 reciprocates in the front-rear direction. At this time, the through-hole 133 reciprocates in an arc shape centering on the support shaft 9B between the diagonally right rear and the right diagonal front of the support shaft 9B. The bent portion of the tip portion 131 is positioned to the right of the support shaft 9B when moving forward, and avoids contact between the tip portion 131 and the support shaft 9B.

伝達部材130は、先端部131にカム部170を有する。カム部170は、平面視略矩形の板状に形成し、先端部131の前方に一体に設ける。カム部170は、上下方向に貫通する溝カム150を有する。溝カム150は前後方向に延び、前端部151と後端部152の間の中間部153が左方に屈曲する。コロ部材165は溝カム150に嵌合する。コロ部材165と溝カム150は、移動機構160を構成する。移動機構160は、伝達部材130が前後方向へ移動する動力を、従動刃110が離間位置と接近位置の間で回動する動力に変換する。糸切機構100の動作時、カム部170は、支軸9Bの右斜め前方で前後方向に往復移動する。コロ部材165は溝カム150の形状に沿って、支軸9Bを中心とする円弧状の軌跡を移動する。   The transmission member 130 has a cam portion 170 at the distal end portion 131. The cam portion 170 is formed in a substantially rectangular plate shape in plan view, and is integrally provided in front of the tip portion 131. The cam portion 170 has a groove cam 150 penetrating in the vertical direction. The groove cam 150 extends in the front-rear direction, and an intermediate portion 153 between the front end portion 151 and the rear end portion 152 is bent leftward. The roller member 165 is fitted into the groove cam 150. The roller member 165 and the groove cam 150 constitute a moving mechanism 160. The moving mechanism 160 converts the power that the transmission member 130 moves in the front-rear direction into the power that the driven blade 110 rotates between the separated position and the approach position. During the operation of the thread cutting mechanism 100, the cam portion 170 reciprocates in the front-rear direction diagonally to the right of the support shaft 9B. The roller member 165 moves along an arc-shaped locus centering on the support shaft 9B along the shape of the groove cam 150.

糸掴み機構40は、糸掴み板41と保持板44を備える。糸掴み板41の形状は、中央部が略直角に屈曲する略L字状の板状である。糸掴み板41の一端部41Aは屈曲部分から前方に延び、他端部41Bは屈曲部分から左方に延びる。支軸42は針板9の下面に固定し、糸掴み板41の中央部を回動可能に支持する。一端部41Aは穴41Cとピン41Eを備える。穴41Cは糸掴み板41を上下方向に貫通する。ピン41Eは穴41Cの後側に設け、上方に突出する。他端部41Bは、第三リンク63の他端部63Bとピン48で連結する。第三リンク63は糸掴みリンク機構60(図5参照)から前方に延びる。第三リンク63が前後方向に移動すると、糸掴み板41は支軸42を中心に水平に往復回動する。   The thread gripping mechanism 40 includes a thread gripping plate 41 and a holding plate 44. The shape of the thread gripping plate 41 is a substantially L-shaped plate whose central portion is bent at a substantially right angle. One end 41A of the thread gripping plate 41 extends forward from the bent portion, and the other end 41B extends leftward from the bent portion. The support shaft 42 is fixed to the lower surface of the needle plate 9 and rotatably supports the center portion of the thread gripping plate 41. One end 41A includes a hole 41C and a pin 41E. The hole 41C penetrates the thread gripping plate 41 in the vertical direction. The pin 41E is provided on the rear side of the hole 41C and protrudes upward. The other end 41 </ b> B is connected to the other end 63 </ b> B of the third link 63 by a pin 48. The third link 63 extends forward from the thread clamp link mechanism 60 (see FIG. 5). When the third link 63 moves in the front-rear direction, the thread gripping plate 41 reciprocates horizontally around the support shaft 42.

保持板44の形状は、中央部が略直角に屈曲する略L字状の板状である。保持板44の一端部44Aは屈曲部分から前方に延び、他端部41Bは屈曲部分から右方に延びる。支軸47は針板9の下面に固定し、保持板44の中央部を回動可能に支持する。一端部44Aは右方に屈曲し、且つ下方に曲げ形成する。保持板44は、糸掴み板41の上側に配置する。保持板44の一端部44Aは糸掴み板41の一端部41Aと向かい合うように配置する。引張バネ45は他端部44Bを後方に付勢し、支軸47を中心に保持板44を底面視時計回りに回動する。糸掴み板41のピン41Eは、保持板44の一端部44Aの右側面に当接し、保持板44の回動を規制する。   The shape of the holding plate 44 is a substantially L-shaped plate whose central portion is bent at a substantially right angle. One end 44A of the holding plate 44 extends forward from the bent portion, and the other end 41B extends rightward from the bent portion. The support shaft 47 is fixed to the lower surface of the needle plate 9 and supports the central portion of the holding plate 44 so as to be rotatable. The one end 44A is bent rightward and bent downward. The holding plate 44 is disposed on the upper side of the thread gripping plate 41. One end portion 44 </ b> A of the holding plate 44 is arranged to face one end portion 41 </ b> A of the thread gripping plate 41. The tension spring 45 urges the other end 44 </ b> B rearward to rotate the holding plate 44 about the support shaft 47 in the clockwise direction when viewed from the bottom. The pin 41E of the thread gripping plate 41 abuts on the right side surface of the one end portion 44A of the holding plate 44 and restricts the rotation of the holding plate 44.

ミシン1は、ベッド部2に駆動機構15を備える。駆動機構15は、糸切機構100と糸掴み機構40を駆動する。図5に示すように、駆動機構15は糸切用モータ95、カム板70、糸切リンク機構50、糸掴みリンク機構60を備える。糸切用モータ95はブラケット80を介してベッド部2の背面下部(図1参照)に固定する。ブラケット80は後面視略U字溝状に形成する。ブラケット80は開口側を右方に向け、ベッド部2背面下部に三本のネジ84(図3参照)で固定する。糸切用モータ95はブラケット85上面に固定し、出力軸(図示略)をブラケット85内に配置する。カム板70はブラケット85内に配置し、糸切用モータ95の出力軸に接続する。カム板70は、上面に溝カム(図示略)を形成し、側面に外周カム(図示略)を形成する。溝カムは、出力軸の回転力を、糸切リンク機構50を駆動する動力に変換する。外周カムは、出力軸の回転力を、糸掴みリンク機構60を駆動する動力に変換する。   The sewing machine 1 includes a drive mechanism 15 in the bed portion 2. The drive mechanism 15 drives the thread trimming mechanism 100 and the thread gripping mechanism 40. As shown in FIG. 5, the drive mechanism 15 includes a thread trimming motor 95, a cam plate 70, a thread trimming link mechanism 50, and a thread gripping link mechanism 60. The thread trimming motor 95 is fixed to the lower back surface of the bed 2 (see FIG. 1) via a bracket 80. The bracket 80 is formed in a substantially U-shaped groove shape in rear view. The bracket 80 is fixed with three screws 84 (see FIG. 3) with the opening side facing rightward and the lower back of the bed portion 2. The thread trimming motor 95 is fixed to the upper surface of the bracket 85, and an output shaft (not shown) is disposed in the bracket 85. The cam plate 70 is disposed in the bracket 85 and connected to the output shaft of the thread cutting motor 95. The cam plate 70 forms a groove cam (not shown) on the top surface and forms an outer peripheral cam (not shown) on the side surface. The groove cam converts the rotational force of the output shaft into power for driving the yarn cutting link mechanism 50. The outer peripheral cam converts the rotational force of the output shaft into power for driving the thread gripping link mechanism 60.

糸切リンク機構50は、糸切用モータ95側から糸切機構100側に向かって順に、第一リンク51と第二リンク52を備える。第一リンク51の形状は、中央部が略直角に屈曲する略L字状の板状である。ブラケット80は第一リンク51の中央部を水平に回動可能に支持する。第一リンク51の一端部51Aはブラケット80の右方に突出する。一端部51Aは、ピン56を介して第二リンク52の他端部52Bと回動可能に連結する。第一リンク51の他端部(図示略)は、下方に突出するコロ部材(図示略)を備える。コロ部材はカム板70の溝カムに嵌合する。   The thread trimming link mechanism 50 includes a first link 51 and a second link 52 in order from the thread trimming motor 95 side toward the thread trimming mechanism 100 side. The shape of the first link 51 is a substantially L-shaped plate whose central portion is bent at a substantially right angle. The bracket 80 supports the central portion of the first link 51 so as to be horizontally rotatable. One end 51 </ b> A of the first link 51 protrudes to the right of the bracket 80. One end 51 </ b> A is rotatably connected to the other end 52 </ b> B of the second link 52 via a pin 56. The other end (not shown) of the first link 51 includes a roller member (not shown) protruding downward. The roller member is fitted into the groove cam of the cam plate 70.

第二リンク52は、穴部2A(図1参照)を介してベッド部2内部に延設する。穴部2Aはベッド部2背面下部の右側に設ける。第二リンク52は、ベッド部2内の構造に応じて所々で屈曲し、且つ前方に向かって延びる。第二リンク52の一端部52Aは、二本のネジ57で伝達部材130の基端部132に固定する。伝達部材130は、基端部132から糸切機構100へ向けて略直線状に前方に延びる。伝達部材130の先端部131は、ピン119を介して駆動刃120と回動可能に連結する。糸切用モータ95の駆動時、糸切リンク機構50は、カム板70の回転方向と角度に応じて糸切機構100の駆動刃120と従動刃110を駆動し、上糸と下糸を切断する。糸切リンク機構50と糸切機構100の動作の詳細は後述する。   The second link 52 extends inside the bed portion 2 through the hole portion 2A (see FIG. 1). The hole 2A is provided on the right side of the lower back of the bed 2. The second link 52 bends in some places according to the structure in the bed portion 2 and extends forward. One end 52 </ b> A of the second link 52 is fixed to the base end 132 of the transmission member 130 with two screws 57. The transmission member 130 extends forward substantially linearly from the base end portion 132 toward the thread trimming mechanism 100. The tip 131 of the transmission member 130 is rotatably connected to the driving blade 120 via a pin 119. When the thread trimmer motor 95 is driven, the thread trimmer link mechanism 50 drives the driving blade 120 and the driven blade 110 of the thread trimmer mechanism 100 according to the rotation direction and angle of the cam plate 70 to cut the upper thread and the lower thread. To do. Details of operations of the thread trimmer link mechanism 50 and the thread trimmer mechanism 100 will be described later.

糸掴みリンク機構60は、糸切用モータ95側から糸掴み機構40側に向かって順に、第一リンク(図示略)、第二リンク62、第三リンク63を備える。糸掴みリンク機構60の第一リンクは、平面視略直線状に形成し、糸切リンク機構50の第一リンク51の下方に配置する。ブラケット80は、第一リンクの中央部を糸切リンク機構50の第一リンク51と同軸で水平に回動可能に支持する。第一リンクの一端部は、ブラケット80の左方に突出し、第二リンク62の他端部と回動可能に連結する。第一リンクの他端部は、下方に突出するコロ部材(図示略)を備える。コロ部材はカム板70の外周カムに当接する。第二リンク62は、ベッド部2背面下部の左側に設けた穴部(図示略)を介してベッド部2内部に延設する。第二リンク62は、ベッド部2内の構造に応じて所々で屈曲し、且つ前方に向かって延びる。第二リンク62の一端部62Aは、二本のネジ67で第三リンク63の他端部63Bに固定する。第三リンク63は、ベッド部2内の構造に応じて所々で屈曲し、且つ糸掴み機構40へ向けて前方に延びる。第三リンク63の一端部63Aは、ピン48を介して糸掴み板41と回動可能に連結する(図4参照)。   The thread gripping link mechanism 60 includes a first link (not shown), a second link 62, and a third link 63 in order from the thread trimming motor 95 side toward the thread gripping mechanism 40 side. The first link of the thread gripping link mechanism 60 is formed in a substantially linear shape in plan view, and is disposed below the first link 51 of the thread trimming link mechanism 50. The bracket 80 supports the central part of the first link so as to be coaxial with the first link 51 of the thread trimming link mechanism 50 and horizontally rotatable. One end portion of the first link protrudes to the left of the bracket 80 and is rotatably connected to the other end portion of the second link 62. The other end of the first link includes a roller member (not shown) protruding downward. The roller member comes into contact with the outer peripheral cam of the cam plate 70. The second link 62 extends into the bed part 2 through a hole (not shown) provided on the left side of the lower part of the back of the bed part 2. The second link 62 bends in some places according to the structure in the bed 2 and extends forward. One end portion 62 </ b> A of the second link 62 is fixed to the other end portion 63 </ b> B of the third link 63 with two screws 67. The third link 63 bends in some places according to the structure in the bed portion 2 and extends forward toward the thread gripping mechanism 40. One end 63A of the third link 63 is rotatably connected to the thread gripping plate 41 via a pin 48 (see FIG. 4).

糸切機構100と糸掴み機構40の動作を説明する。縫製開始時、糸切用モータ95は出力軸を駆動し、カム板70を所定の方向に往復回動する。糸掴みリンク機構60は、カム板70の回転方向と角度に応じ、糸掴み機構40の糸掴み板41と保持板44を回動する。図4に示すように、第三リンク63が前方へ移動すると、糸掴み板41は底面視時計回りに回動する。一端部41Aの穴41Cは、針穴9Aの下方に位置する。   The operation of the thread trimming mechanism 100 and the thread gripping mechanism 40 will be described. At the start of sewing, the thread trimmer motor 95 drives the output shaft to reciprocate the cam plate 70 in a predetermined direction. The thread gripping link mechanism 60 rotates the thread gripping plate 41 and the holding plate 44 of the thread gripping mechanism 40 according to the rotation direction and angle of the cam plate 70. As shown in FIG. 4, when the third link 63 moves forward, the thread gripping plate 41 rotates clockwise as viewed from the bottom. The hole 41C of the one end 41A is located below the needle hole 9A.

縫製開始時の一針目の上糸は、布を通過して針板9の針穴9Aから糸掴み板41の穴41Cを通過して下方に延びる。糸切用モータ95は第三リンク63を後方へ移動し、糸掴み板41を底面視反時計回りに回動する。穴41Cを通過する上糸は、糸掴み板41の一端部41Aと共に左方に移動する。一端部41Aは、保持板44の一端部44Aとの間に上糸を挟み、上糸を屈曲して保持する。一針目以降、糸掴み板41は、一端部41Aが左方に移動し続け、一端部41Aのピン41Eで保持板44を押圧する。上糸は、糸掴み板41と保持板44の間から抜け、穴41Cからも抜ける。ミシン1は、最初に保持した上糸を縫目の中に巻き込んで縫製を続ける。糸切用モータ95は、出力軸が縫製開始前の状態に戻ると駆動を停止し、非駆動状態になる。   The upper thread of the first stitch at the start of sewing passes through the cloth and extends downward from the needle hole 9A of the needle plate 9 through the hole 41C of the thread gripping plate 41. The thread trimming motor 95 moves the third link 63 rearward and rotates the thread gripping plate 41 counterclockwise as viewed from the bottom. The upper thread passing through the hole 41C moves to the left together with the one end 41A of the thread gripping plate 41. The one end portion 41A sandwiches the upper thread with the one end portion 44A of the holding plate 44, and bends and holds the upper thread. From the first stitch onward, the one end 41A of the thread gripping plate 41 continues to move to the left and presses the holding plate 44 with the pin 41E of the one end 41A. The upper thread comes out from between the thread gripping plate 41 and the holding plate 44 and also comes out from the hole 41C. The sewing machine 1 continues sewing by winding the first held upper thread into the seam. When the output shaft returns to the state before the start of sewing, the thread trimmer motor 95 stops driving and enters a non-driven state.

縫製終了時、糸切用モータ95は出力軸を駆動し、カム板70を縫製開始時とは反対の方向に往復回動する。糸切リンク機構50は、カム板70の回転方向と角度に応じて駆動し、糸切機構100の伝達部材130を前後方向へ往復移動する。図4、図6、図7に示すように、伝達部材130が前後方向へ往復移動する時、駆動刃120は、ピン119を介して支軸9Bを中心に水平に往復回動し、待機位置(図4参照)と準備位置(図6参照)の間を往復移動する。待機位置は、駆動刃120の一端部121が針板9の針穴9Aの形成位置と重ならず、且つ刃部124を針穴9Aの形成位置から離れた前方の位置に配置する時の駆動刃120の位置である。駆動刃120が待機位置に位置する時、伝達部材130は、前後方向の移動範囲において最も後方に位置する。糸切機構100は、糸切時以外は駆動刃120を待機位置に配置する。準備位置は、駆動刃120が待機位置から底面視反時計回りに回動した時に刃部124が針穴9Aの形成位置を通過し、且つ一端部121が針穴9Aの形成位置と重ならない位置である時の駆動刃120の位置である。駆動刃120が準備位置に位置する時、伝達部材130は、前後方向への移動範囲において最も前方に位置する。   At the end of sewing, the thread trimming motor 95 drives the output shaft and reciprocates the cam plate 70 in the direction opposite to that at the start of sewing. The thread trimming link mechanism 50 is driven according to the rotation direction and angle of the cam plate 70, and reciprocates the transmission member 130 of the thread trimming mechanism 100 in the front-rear direction. As shown in FIGS. 4, 6, and 7, when the transmission member 130 reciprocates in the front-rear direction, the driving blade 120 reciprocates horizontally around the support shaft 9 </ b> B via the pin 119, and is in a standby position. (See FIG. 4) and reciprocating between the preparation position (see FIG. 6). The standby position is a drive when the one end 121 of the drive blade 120 does not overlap the formation position of the needle hole 9A of the needle plate 9 and the blade 124 is disposed at a front position away from the formation position of the needle hole 9A. This is the position of the blade 120. When the driving blade 120 is positioned at the standby position, the transmission member 130 is positioned most rearward in the range of movement in the front-rear direction. The thread cutting mechanism 100 arranges the driving blade 120 at the standby position except during thread cutting. The preparation position is a position where the blade portion 124 passes through the formation position of the needle hole 9A and the one end portion 121 does not overlap the formation position of the needle hole 9A when the driving blade 120 rotates counterclockwise from the standby position. This is the position of the driving blade 120 when. When the driving blade 120 is located at the preparation position, the transmission member 130 is located at the foremost position in the range of movement in the front-rear direction.

従動刃110のコロ部材165は、支軸9Bの右斜め前方に位置し、カム部170の溝カム150に嵌合する。溝カム150の前端部151と後端部152はカム部170の右端に位置し、中間部153はカム部170の左端に位置する。故に、伝達部材130が前後方向の一方へ移動する時、コロ部材165は、溝カム150に沿って左右方向に往復移動する。コロ部材165が左右方向に往復移動することで、従動刃110は、支軸9Bを中心に水平に往復回動し、離間位置(図4参照)と接近位置(図7参照)の間を往復移動する。離間位置は、従動刃110の一端部111が針穴9Aの形成位置と重ならず、且つ刃部114を針穴9Aの形成位置から離れた前方の位置に配置する時の従動刃110の位置である。接近位置は、刃部114を針穴9Aの形成位置に配置する時の従動刃110の位置である。駆動刃120と従動刃110は、同一の支軸9Bを中心に夫々回動する。駆動刃120の刃部124の移動軌跡は、従動刃110の刃部114の移動軌跡と重なる位置を含む。   The roller member 165 of the driven blade 110 is positioned diagonally to the right of the support shaft 9B and is fitted to the groove cam 150 of the cam portion 170. The front end portion 151 and the rear end portion 152 of the groove cam 150 are located at the right end of the cam portion 170, and the intermediate portion 153 is located at the left end of the cam portion 170. Therefore, when the transmission member 130 moves to one side in the front-rear direction, the roller member 165 reciprocates in the left-right direction along the groove cam 150. As the roller member 165 reciprocates in the left-right direction, the driven blade 110 reciprocates horizontally around the support shaft 9B, and reciprocates between the separation position (see FIG. 4) and the approach position (see FIG. 7). Moving. The separation position is the position of the driven blade 110 when the one end portion 111 of the driven blade 110 does not overlap the formation position of the needle hole 9A and the blade portion 114 is arranged at a front position away from the formation position of the needle hole 9A. It is. The approach position is the position of the driven blade 110 when the blade portion 114 is disposed at the formation position of the needle hole 9A. The driving blade 120 and the driven blade 110 rotate around the same support shaft 9B. The movement locus of the blade portion 124 of the driving blade 120 includes a position overlapping the movement locus of the blade portion 114 of the driven blade 110.

駆動刃120が待機位置にある時、コロ部材165は、溝カム150の前端部151に位置する。該時、コロ部材165は左右方向の移動範囲の右端に位置し、従動刃110は離間位置に位置する(図4参照)。糸切用モータ95の駆動によって伝達部材130が前方に移動すると、駆動刃120は底面視反時計回りに回動し、待機位置から準備位置へ向けて移動する。駆動刃120が待機位置から準備位置へ向けて移動する時、駆動刃120の糸捌き部123は針穴9Aの形成位置を通る。糸捌き部123は、縫針7が針板9下側で形成した上糸環内に突入する。該時、上糸環のうち縫針7から延びる側は、糸係合部125に掛かる。糸係合部125は、上糸を掛けた状態で後方に移動し、上糸環のうち縫針7から延びる側を後方に誘導する。駆動刃120が準備位置に位置する時、上糸環のうち縫針7から延びる側は糸係合部125に接触し、針穴9Aを通って上方に延びた状態になる。   When the driving blade 120 is in the standby position, the roller member 165 is positioned at the front end portion 151 of the groove cam 150. At this time, the roller member 165 is positioned at the right end of the moving range in the left-right direction, and the driven blade 110 is positioned at the separated position (see FIG. 4). When the transmission member 130 moves forward by driving the thread cutting motor 95, the driving blade 120 rotates counterclockwise as viewed from the bottom, and moves from the standby position toward the preparation position. When the driving blade 120 moves from the standby position toward the preparation position, the threading portion 123 of the driving blade 120 passes through the formation position of the needle hole 9A. The threading portion 123 enters the upper thread ring formed by the sewing needle 7 below the needle plate 9. At this time, the side of the upper thread ring extending from the sewing needle 7 is engaged with the thread engaging portion 125. The thread engaging portion 125 moves rearward with the upper thread hooked, and guides the upper thread ring extending from the sewing needle 7 rearward. When the driving blade 120 is located at the preparation position, the side of the upper thread ring that extends from the sewing needle 7 contacts the thread engaging portion 125 and extends upward through the needle hole 9A.

駆動刃120が待機位置から準備位置へ向けて移動する時、コロ部材165は、溝カム150の前端部151から後端部152へ向かう途中で中間部153を通る。コロ部材165は、中間部153を通過する時、左右方向の移動範囲の左端に位置する。この時、従動刃110は接近位置に位置する。駆動刃120は、待機位置から準備位置に移動する過程で従動刃110を下方から覆うように位置する。駆動刃120は、上糸環のうち縫針7から延びる側を糸係合部125で従動刃110の刃部114よりも右側に逃す。駆動刃120は、上糸環のうち布から延びる側と下糸を糸案内部126で従動刃110の刃部114よりも左側に逃す。駆動刃120が準備位置に移動した時、コロ部材165は、溝カム150の後端部152に位置する。該時、コロ部材165は左右方向の移動範囲の右端に位置し、従動刃110は離間位置に位置する(図6参照)。   When the driving blade 120 moves from the standby position toward the preparation position, the roller member 165 passes through the intermediate portion 153 on the way from the front end portion 151 to the rear end portion 152 of the groove cam 150. When the roller member 165 passes through the intermediate portion 153, the roller member 165 is located at the left end of the moving range in the left-right direction. At this time, the driven blade 110 is located at the approach position. The driving blade 120 is positioned so as to cover the driven blade 110 from below in the process of moving from the standby position to the preparation position. The drive blade 120 allows the side of the upper thread ring extending from the sewing needle 7 to escape to the right side of the blade portion 114 of the driven blade 110 at the thread engaging portion 125. The driving blade 120 allows the side of the upper thread ring extending from the cloth and the lower thread to escape to the left side of the blade portion 114 of the driven blade 110 through the yarn guide portion 126. When the driving blade 120 moves to the preparation position, the roller member 165 is positioned at the rear end portion 152 of the groove cam 150. At this time, the roller member 165 is located at the right end of the moving range in the left-right direction, and the driven blade 110 is located at the separated position (see FIG. 6).

糸切用モータ95の駆動によって伝達部材130が後方に移動すると、駆動刃120は底面視時計回りに回動し、準備位置から待機位置へ向けて移動する。駆動刃120が準備位置から待機位置に移動する過程で、糸捕捉部127は、上糸環のうち布から延びる側と下糸を糸捕捉部127の中央に誘導する。上糸環のうち布から延びる側と下糸は、一端部121上面に設けた凹部(図示略)に沿って、糸捕捉部127から刃部124に向けて延びる。   When the transmission member 130 moves rearward by driving the thread cutting motor 95, the driving blade 120 rotates clockwise as viewed from the bottom, and moves from the preparation position toward the standby position. In the process in which the driving blade 120 moves from the preparation position to the standby position, the yarn catching portion 127 guides the side of the upper yarn ring that extends from the cloth and the lower yarn to the center of the yarn catching portion 127. The side of the upper thread ring that extends from the cloth and the lower thread extend from the thread catching section 127 toward the blade section 124 along a recess (not shown) provided on the upper surface of the one end section 121.

駆動刃120が準備位置から待機位置へ向けて移動する時、コロ部材165は、溝カム150の後端部152から前端部151へ向かう途中で中間部153を通る。コロ部材165が中間部153を通過する時、従動刃110は接近位置に位置する。従動刃110が接近位置に位置する間、駆動刃120の刃部124は、針穴9Aの形成位置を、後方から前方へ向けて通過する。駆動刃120の刃部124は、針穴9Aの形成位置を通過する時、従動刃110の刃部114と上下方向に交差する。該時の駆動刃120の位置は切断位置である。即ち切断位置は、従動刃110が接近位置にあり、且つ駆動刃120の刃部124が従動刃110の刃部114と交差する時の駆動刃120の位置である。駆動刃120が準備位置から待機位置に移動する過程で切断位置を通過する時、カム部170の溝カム150はコロ部材165を中間部153に案内し、従動刃110を接近位置に配置する(図7参照)。駆動刃120の刃部124と従動刃110の刃部114は、上糸環のうち布に向けて延びる側と下糸を挟み、夫々切断する。   When the driving blade 120 moves from the preparation position toward the standby position, the roller member 165 passes through the intermediate portion 153 on the way from the rear end portion 152 to the front end portion 151 of the groove cam 150. When the roller member 165 passes through the intermediate portion 153, the driven blade 110 is located at the approach position. While the driven blade 110 is located at the approach position, the blade portion 124 of the drive blade 120 passes through the formation position of the needle hole 9A from the rear toward the front. The blade portion 124 of the driving blade 120 intersects the blade portion 114 of the driven blade 110 in the vertical direction when passing through the formation position of the needle hole 9A. The position of the driving blade 120 at this time is a cutting position. That is, the cutting position is the position of the driving blade 120 when the driven blade 110 is in the approach position and the blade portion 124 of the driving blade 120 intersects the blade portion 114 of the driven blade 110. When the driving blade 120 passes through the cutting position in the process of moving from the preparation position to the standby position, the groove cam 150 of the cam portion 170 guides the roller member 165 to the intermediate portion 153 and places the driven blade 110 in the approach position ( (See FIG. 7). The blade portion 124 of the driving blade 120 and the blade portion 114 of the driven blade 110 sandwich the side of the upper thread ring that extends toward the cloth and the lower thread, and cut each.

糸切用モータ95の駆動によって伝達部材130が後方に移動し、駆動刃120は切断位置から待機位置に移動する(図4参照)。伝達部材130の後方への移動によって、カム部170の溝カム150は、コロ部材165を前端部151に案内する。コロ部材165は、左右方向の移動範囲の右端に位置する。従動刃110は離間位置に移動し、糸切機構100は、糸の切断を終了する。   The transmission member 130 moves rearward by driving the thread cutting motor 95, and the driving blade 120 moves from the cutting position to the standby position (see FIG. 4). The groove cam 150 of the cam portion 170 guides the roller member 165 to the front end portion 151 by the rearward movement of the transmission member 130. The roller member 165 is located at the right end of the moving range in the left-right direction. The driven blade 110 moves to the separation position, and the yarn cutting mechanism 100 finishes cutting the yarn.

ミシン1は、糸切リンク機構50を駆動し、駆動刃120を駆動すれば、移動機構160を介し、従動刃110を駆動できる。即ちミシン1は、従動刃110を駆動する為の駆動機構を、糸切リンク機構50の他に設ける必要がない。故にミシン1は、従動刃110の代わりに固定刃を用いた従来の構成の糸切機構と差し替えるだけで、糸切機構100を組み付けることができる。   The sewing machine 1 can drive the driven blade 110 via the moving mechanism 160 by driving the thread cutting link mechanism 50 and driving the driving blade 120. That is, the sewing machine 1 does not need to provide a drive mechanism for driving the driven blade 110 in addition to the thread cutting link mechanism 50. Therefore, the sewing machine 1 can be assembled with the thread cutting mechanism 100 only by replacing the conventional thread cutting mechanism using a fixed blade instead of the driven blade 110.

以上説明のように、第一実施形態では、縫製時、従動刃110と駆動刃120は、夫々の刃部114、124を針穴9Aから離れた位置に配置する。上糸と下糸が刃部114、124に接触し難くなるので、糸切機構100は、糸切れの可能性を低減できる。糸切り時、従動刃110と駆動刃120は刃部114、124を針穴9Aの形成位置で交差し、上糸と下糸を切断する。故に糸切機構100は、針穴9Aから離れた位置で上糸と下糸を切断した場合と比べ、縫製対象物に残る上糸と下糸の切れ端を短くできる。   As described above, in the first embodiment, at the time of sewing, the driven blade 110 and the driving blade 120 arrange the respective blade portions 114 and 124 at positions away from the needle hole 9A. Since the upper thread and the lower thread are difficult to contact the blade portions 114 and 124, the thread cutting mechanism 100 can reduce the possibility of thread breakage. At the time of thread trimming, the driven blade 110 and the driving blade 120 intersect the blade portions 114 and 124 at the formation position of the needle hole 9A to cut the upper thread and the lower thread. Therefore, the thread trimming mechanism 100 can shorten the upper thread and lower thread cut ends remaining on the sewing object as compared with the case where the upper thread and the lower thread are cut at a position away from the needle hole 9A.

カム部170に形成した溝カム150とコロ部材165は、移動機構160を構成する。コロ部材165は、溝カム150に嵌合するので、カム面から離れない。即ち、カムとコロの係合を維持する為、コロ部材165をカム面に押しつける力は不要である。故に移動機構160は、例えば付勢部材が不要の構成なので、部品点数を削減することができる。   The groove cam 150 and the roller member 165 formed on the cam portion 170 constitute a moving mechanism 160. Since the roller member 165 is fitted into the groove cam 150, the roller member 165 does not leave the cam surface. That is, in order to maintain the engagement between the cam and the roller, no force is required to press the roller member 165 against the cam surface. Therefore, since the moving mechanism 160 does not require an urging member, for example, the number of parts can be reduced.

従動刃110と駆動刃120を回動可能に支持する支軸9Bは一つで足りる。故に糸切機構100は、部品点数を削減することができる。   A single supporting shaft 9B that supports the driven blade 110 and the driving blade 120 in a rotatable manner is sufficient. Therefore, the thread trimming mechanism 100 can reduce the number of parts.

図8〜図13を参照し、本発明の第二実施形態を説明する。第二実施形態に係るミシン1は、糸切機構200の構成が第一実施形態の糸切機構100の構成と異なる。ミシン1の他の構成は同じであるので、以下では糸切機構200の構成を説明し、他の構成の説明は省略する。以下の説明で、糸切機構200を構成する各部材の方向の説明は、駆動刃220が待機位置(図8参照)に位置する時の向きで説明する。   A second embodiment of the present invention will be described with reference to FIGS. The sewing machine 1 according to the second embodiment is different in the configuration of the thread trimmer mechanism 200 from the configuration of the thread trimmer mechanism 100 of the first embodiment. Since the other configuration of the sewing machine 1 is the same, the configuration of the thread trimming mechanism 200 will be described below, and the description of the other configurations will be omitted. In the following description, the direction of each member constituting the thread trimming mechanism 200 will be described in the direction when the driving blade 220 is positioned at the standby position (see FIG. 8).

図8に示すように、糸切機構200は従動刃210、駆動刃220、伝達部材230、移動機構260を備える。従動刃210は板状で、一端部211から他端部212に向けて左斜め前方に延びる。一端部211側は、他端部212側よりも細幅に形成する。従動刃210は、一端部211に刃部214を設け、他端部212にピン213を備える。ピン213は下方に突出する。針板9は、下面に案内部201を備える。案内部201は、針穴9Aを従動刃210に沿って直線状に延びる溝状に形成する。案内部201の溝幅は、従動刃210の板幅と略同じである。従動刃210は、案内部201に係合し、一端部211を針穴9A側に向けて配置する。底面視U字状の押え板204は、案内部201の右端の一部と左端と後端に沿って設ける。押え板204は、従動刃210の縁部を下側から押え、従動刃210を案内部201内で直線状に移動可能に保持する。押え板204は、螺子261で針板9に固定する。螺子261は、リンク部材240の左端部241に当接して従動刃210の左斜め前方への移動を規制する。   As shown in FIG. 8, the thread cutting mechanism 200 includes a driven blade 210, a driving blade 220, a transmission member 230, and a moving mechanism 260. The driven blade 210 is plate-shaped and extends obliquely leftward from the one end 211 toward the other end 212. The one end 211 side is formed narrower than the other end 212 side. The driven blade 210 is provided with a blade portion 214 at one end portion 211 and a pin 213 at the other end portion 212. The pin 213 protrudes downward. The needle plate 9 includes a guide portion 201 on the lower surface. The guide part 201 forms the needle hole 9 </ b> A in a groove shape extending linearly along the driven blade 210. The groove width of the guide portion 201 is substantially the same as the plate width of the driven blade 210. The driven blade 210 engages with the guide portion 201 and is arranged with one end portion 211 facing the needle hole 9A. The holding plate 204 having a U-shape when viewed from the bottom is provided along a part of the right end, the left end, and the rear end of the guide portion 201. The holding plate 204 holds the edge of the driven blade 210 from the lower side, and holds the driven blade 210 so as to be linearly movable in the guide portion 201. The presser plate 204 is fixed to the needle plate 9 with screws 261. The screw 261 abuts on the left end 241 of the link member 240 and restricts the movement of the driven blade 210 obliquely forward to the left.

従動刃210は、案内部201の案内によって、離間位置と接近位置の間を直線状に移動する。離間位置は、刃部214を針穴9Aの左斜め前方に離れた位置に配置する時の従動刃210の位置である。接近位置は、刃部214を針穴9Aの形成位置に配置する時の従動刃210の位置である。針板9は、案内部201の左斜め前方に、下方に突出するピン202を備える。引張バネ206は、従動刃210のピン213と針板9のピン202の間に掛け留める。引張バネ206は、従動刃210を左斜め前方に付勢する。   The driven blade 210 moves linearly between the separated position and the approach position by the guidance of the guide unit 201. The separation position is the position of the driven blade 210 when the blade portion 214 is arranged at a position that is diagonally left forward of the needle hole 9A. The approach position is the position of the driven blade 210 when the blade portion 214 is disposed at the formation position of the needle hole 9A. The throat plate 9 includes a pin 202 that protrudes downward and obliquely to the left of the guide portion 201. The tension spring 206 is hooked between the pin 213 of the driven blade 210 and the pin 202 of the needle plate 9. The tension spring 206 urges the driven blade 210 diagonally forward to the left.

リンク部材240は左右方向に延びる板状で、中間部分が屈曲する。リンク部材240の左端部241は屈曲部分から左後方に延びる。リンク部材240の右端部242は屈曲部分から右方に延びる。リンク部材240は、屈曲部分に軸穴(図示略)を有する。軸穴は、支軸203に係合する。支軸203は針板9下面に設け、案内部201の右斜め前方に位置する。支軸203は、リンク部材240を水平に往復回動可能に支持する。左端部241は、左端部241が延びる方向に沿う長穴243を有する。従動刃210のピン213は、リンク部材240の長穴243に係合し、長穴243内を移動可能である。右端部242は、下方に突出するコロ部材265を備える。針板9とリンク部材240の間には、支軸9Bに係合する圧縮バネ245を設ける。圧縮バネ245は、リンク部材240を下方に付勢する。   The link member 240 has a plate shape extending in the left-right direction, and an intermediate portion is bent. The left end 241 of the link member 240 extends rearward from the bent portion. A right end 242 of the link member 240 extends rightward from the bent portion. The link member 240 has a shaft hole (not shown) at the bent portion. The shaft hole engages with the support shaft 203. The support shaft 203 is provided on the lower surface of the needle plate 9 and is positioned obliquely forward and to the right of the guide portion 201. The support shaft 203 supports the link member 240 so as to be horizontally reciprocable. The left end 241 has a long hole 243 along the direction in which the left end 241 extends. The pin 213 of the driven blade 210 engages with the long hole 243 of the link member 240 and can move within the long hole 243. The right end 242 includes a roller member 265 that protrudes downward. A compression spring 245 that engages with the support shaft 9B is provided between the needle plate 9 and the link member 240. The compression spring 245 biases the link member 240 downward.

上述のように、引張バネ206が従動刃210を左斜め前方に付勢すると、ピン213が長穴243に係合するので、リンク部材240は、引張バネ206の付勢によって、支軸203を中心に底面視時計回りに回動する。コロ部材265は、リンク部材240の回動によって後方へ移動する。故に、コロ部材265は、引張バネ206の付勢によって外周カム250に当接する状態を維持出来る。   As described above, when the tension spring 206 urges the driven blade 210 obliquely to the left, the pin 213 engages with the elongated hole 243, so that the link member 240 causes the support shaft 203 to be moved by the urging of the tension spring 206. It rotates in the clockwise direction when viewed from the bottom. The roller member 265 moves rearward by the rotation of the link member 240. Therefore, the roller member 265 can maintain a state in which the roller member 265 is in contact with the outer peripheral cam 250 by the urging of the tension spring 206.

駆動刃220の形状は、左右方向に延びる板状である。駆動刃220は中間部分に、支軸9Bに係合する軸穴(図示略)を有する。支軸9Bは、駆動刃220を水平に往復回動可能に支持する。駆動刃220は一端部221、他端部222を備える。一端部221は軸穴の左方に延び、他端部222は軸穴の右方に延びる。一端部221は、糸捌き部223、刃部224、糸係合部225、糸案内部226、糸捕捉部227を有する。糸捌き部223、刃部224、糸係合部225、糸案内部226、糸捕捉部227の構成は、第一実施形態の糸捌き部123、刃部124、糸係合部125、糸案内部126、糸捕捉部127の構成と同様なので、説明を省略する。他端部222は、下方に突出するピン219を備える。ピン219は、伝達部材230の先端部231の貫通穴233に係合する。駆動刃220は、伝達部材230と回動可能に連結する。駆動刃220は、軸穴の前方に突出する突出部228を有する。突出部228は、下方に突出するボルト229を備える。   The shape of the driving blade 220 is a plate shape extending in the left-right direction. The driving blade 220 has a shaft hole (not shown) that engages with the support shaft 9B at an intermediate portion. The support shaft 9B supports the drive blade 220 so as to be horizontally reciprocally rotatable. The driving blade 220 includes one end 221 and the other end 222. One end 221 extends to the left of the shaft hole, and the other end 222 extends to the right of the shaft hole. The one end 221 includes a threading portion 223, a blade portion 224, a thread engaging portion 225, a yarn guiding portion 226, and a yarn catching portion 227. The configurations of the threading unit 223, the blade unit 224, the thread engaging unit 225, the thread guiding unit 226, and the thread catching unit 227 are the same as the threading unit 123, the blade unit 124, the thread engaging unit 125, and the thread guide of the first embodiment. Since it is the same as that of the part 126 and the thread | yarn capture part 127, description is abbreviate | omitted. The other end portion 222 includes a pin 219 protruding downward. The pin 219 engages with the through hole 233 of the distal end portion 231 of the transmission member 230. The driving blade 220 is rotatably connected to the transmission member 230. The drive blade 220 has a protrusion 228 that protrudes in front of the shaft hole. The protrusion 228 includes a bolt 229 that protrudes downward.

カム部材270は、駆動刃220の下側に設ける。図9、図10に示すように、カム部材270は、外周カム250と支持板275を備える。支持板275は、支軸9Bに係合する軸穴276を有する。支持板275は、外周カム250の左斜め後側の端部から、左斜め後方に板状に突出する。外周カム250は、コロ部材265が当接するカム面251〜253と突部254を有する。リンク部材240とコロ部材265と外周カム250は、移動機構260を構成する。移動機構260は、伝達部材230が前後方向へ移動する動力を、従動刃210が離間位置と接近位置の間で移動する動力に変換する。   The cam member 270 is provided below the drive blade 220. As shown in FIGS. 9 and 10, the cam member 270 includes an outer peripheral cam 250 and a support plate 275. The support plate 275 has a shaft hole 276 that engages with the support shaft 9B. The support plate 275 protrudes in a plate shape obliquely leftward and rearward from the left diagonally rear end of the outer cam 250. The outer circumferential cam 250 has cam surfaces 251 to 253 with which the roller member 265 abuts and a protrusion 254. The link member 240, the roller member 265, and the outer peripheral cam 250 constitute a moving mechanism 260. The moving mechanism 260 converts the power that the transmission member 230 moves in the front-rear direction into the power that the driven blade 210 moves between the separated position and the approach position.

カム面251〜253は、軸穴276の軸心を中心とする円弧状の外周面であり、軸穴276の前方を周方向に延びる。突部254は、カム面251〜253の周方向の中央よりも左寄りの位置、且つ上下方向の中央よりも下寄りの位置に設ける。突部254は、カム面251〜253よりも径方向外側に突出する。カム面251は、突部254の左側に位置する。カム面252は、突部254の上側に位置する。カム面253は、突部254の右側に位置する。カム面251〜253にコロ部材265が当接する時、従動刃210は離間位置に位置する。   The cam surfaces 251 to 253 are arc-shaped outer peripheral surfaces with the shaft center of the shaft hole 276 as the center, and extend in front of the shaft hole 276 in the circumferential direction. The protrusion 254 is provided at a position on the left side of the center in the circumferential direction of the cam surfaces 251 to 253 and a position on the lower side of the center in the vertical direction. The protrusion 254 protrudes radially outward from the cam surfaces 251 to 253. The cam surface 251 is located on the left side of the protrusion 254. The cam surface 252 is located above the protrusion 254. The cam surface 253 is located on the right side of the protrusion 254. When the roller member 265 comes into contact with the cam surfaces 251 to 253, the driven blade 210 is located at the separated position.

突部254の上下方向の厚みは、カム面251側よりもカム面253側の方が厚い。突部254の上面は、カム面251側からカム面253側へ向けて上方に傾斜する傾斜面255を形成する。突部254の外周面256にコロ部材265が当接する時、従動刃210は接近位置に位置する。カム部材270は、カム面251〜253よりも径方向内側に、上下方向に貫通し、周方向に延びる長穴257を有する。支持板275の軸穴276に支軸9Bが係合した時、駆動刃220の突出部228のボルト229は、長穴257に係合する。カム部材270と駆動刃220は、ボルト229の位置を長穴257の範囲内で移動することで、互いの位置を水平にずらすことができる。図8に示すように、ナット205はボルト229に締結し、駆動刃220とカム部材270を固定する。従って、カム部材270と駆動刃220は、支軸9Bを中心に一体に回動する。カム部材270と駆動刃220の位置関係を調整することで、突部254にコロ部材265が当接するタイミングが変わる。即ち糸切機構200は、移動機構260が従動刃210を動作するタイミングをずらすことができる。故に糸切機構200は、上糸と下糸の切断時に駆動刃220の刃部224と従動刃210の刃部214が交差する位置を調整できる。   The thickness of the protrusion 254 in the vertical direction is larger on the cam surface 253 side than on the cam surface 251 side. The upper surface of the protrusion 254 forms an inclined surface 255 that is inclined upward from the cam surface 251 side toward the cam surface 253 side. When the roller member 265 contacts the outer peripheral surface 256 of the protrusion 254, the driven blade 210 is located at the approach position. The cam member 270 has a long hole 257 that penetrates in the vertical direction and extends in the circumferential direction on the radially inner side of the cam surfaces 251 to 253. When the support shaft 9B is engaged with the shaft hole 276 of the support plate 275, the bolt 229 of the protrusion 228 of the drive blade 220 is engaged with the elongated hole 257. The cam member 270 and the driving blade 220 can shift the positions of the bolts 229 horizontally by moving the position of the bolt 229 within the range of the elongated hole 257. As shown in FIG. 8, the nut 205 is fastened to the bolt 229 to fix the drive blade 220 and the cam member 270. Therefore, the cam member 270 and the drive blade 220 rotate integrally around the support shaft 9B. By adjusting the positional relationship between the cam member 270 and the driving blade 220, the timing at which the roller member 265 contacts the protrusion 254 changes. That is, the thread cutting mechanism 200 can shift the timing at which the moving mechanism 260 operates the driven blade 210. Therefore, the thread cutting mechanism 200 can adjust the position where the blade part 224 of the driving blade 220 and the blade part 214 of the driven blade 210 intersect when cutting the upper thread and the lower thread.

伝達部材230の形状は、前後方向に長く延びる板状である。伝達部材230の先端部231は、右方に弧状に屈曲する部分を有する。先端部231は、上下方向に貫通する貫通穴233を有する。駆動刃220のピン219は、貫通穴233に係合する。糸切機構200の動作時、伝達部材230は前後方向に往復移動する。該時、貫通穴233は、支軸9Bの右斜め後方と右斜め前方との間で支軸9Bを中心とする円弧状に往復移動する。先端部231の屈曲部分は、前方への移動時に支軸9Bの右方に位置し、先端部231と支軸9Bの接触を避ける。   The shape of the transmission member 230 is a plate shape that extends long in the front-rear direction. The distal end portion 231 of the transmission member 230 has a portion bent in an arc shape to the right. The tip 231 has a through hole 233 that penetrates in the vertical direction. The pin 219 of the driving blade 220 engages with the through hole 233. During the operation of the thread trimming mechanism 200, the transmission member 230 reciprocates in the front-rear direction. At this time, the through hole 233 reciprocates in an arc shape centering on the support shaft 9B between the diagonally right rear and the diagonally right front of the support shaft 9B. The bent portion of the tip 231 is positioned to the right of the support shaft 9B when moving forward, and avoids contact between the tip 231 and the support shaft 9B.

糸切機構200の動作を説明する。縫製終了時、糸切用モータ95は出力軸を駆動する。糸切リンク機構50は、カム板70の回転方向と角度に応じて駆動し、糸切機構200の伝達部材230を前後方向へ往復移動する。図8〜図13に示すように、伝達部材230が前後方向へ往復移動する時、駆動刃220は、ピン219を介して支軸9Bを中心に水平に往復回動し、待機位置(図8参照)と準備位置(図12参照)の間を往復移動する。駆動刃220が待機位置に位置する時、伝達部材230は、前後方向への移動範囲において最も後方に位置する。糸切機構200は、糸切時以外は駆動刃220を待機位置に配置する。駆動刃220が準備位置に位置する時、伝達部材230は、前後方向への移動範囲において最も前方に位置する。駆動刃220が待機位置と準備位置の間で移動する時、刃部224は、支軸9Bを中心とする円弧状の回動軌跡に沿って移動する。該時、刃部224は針穴9Aの形成位置を通過する。   The operation of the thread trimming mechanism 200 will be described. At the end of sewing, the thread trimming motor 95 drives the output shaft. The thread trimming link mechanism 50 is driven according to the rotation direction and angle of the cam plate 70, and reciprocates the transmission member 230 of the thread trimming mechanism 200 in the front-rear direction. As shown in FIGS. 8 to 13, when the transmission member 230 reciprocates in the front-rear direction, the driving blade 220 reciprocates horizontally around the support shaft 9 </ b> B via the pin 219, and is in a standby position (FIG. 8). And a reciprocating movement between the preparation position (see FIG. 12). When the driving blade 220 is positioned at the standby position, the transmission member 230 is positioned most rearward in the range of movement in the front-rear direction. The thread cutting mechanism 200 arranges the driving blade 220 at the standby position except during thread cutting. When the driving blade 220 is positioned at the preparation position, the transmission member 230 is positioned most forward in the range of movement in the front-rear direction. When the driving blade 220 moves between the standby position and the preparation position, the blade portion 224 moves along an arcuate rotation locus centering on the support shaft 9B. At this time, the blade portion 224 passes through the formation position of the needle hole 9A.

駆動刃220が待機位置にある時、コロ部材265は、引張バネ206の付勢で外周カム250のカム面251に当接する。該時、従動刃210は、離間位置に位置する。リンク部材240を付勢する圧縮バネ245は、コロ部材265を下方に移動する。コロ部材265の下端は、突部254のカム面251側の端部において、突部254の上端よりも上側に位置する。   When the driving blade 220 is in the standby position, the roller member 265 contacts the cam surface 251 of the outer cam 250 by the biasing force of the tension spring 206. At this time, the driven blade 210 is located at the separated position. A compression spring 245 that biases the link member 240 moves the roller member 265 downward. The lower end of the roller member 265 is positioned above the upper end of the protrusion 254 at the end of the protrusion 254 on the cam surface 251 side.

糸切用モータ95の駆動によって伝達部材230が前方に移動すると、駆動刃220は底面視反時計回りに回動し、待機位置から準備位置へ向けて移動する。図11に示すように、駆動刃220が待機位置から準備位置へ向けて移動する時、コロ部材265は、カム面251からカム面252に移動する。コロ部材265は、下端が突部254のカム面251側の端部において突部254の上端よりも上側に位置するので、突部254の傾斜面255に当接し、傾斜面255に沿って上方へ移動する(図10の一点鎖線参照)。故に、コロ部材265は、突部254の外周面256には当接せず、カム面252に当接する。カム面251〜253が支軸9Bの周方向に延びるので、コロ部材265は、カム面251からカム面252に移動しても、前後方向の位置が変わらない。故にリンク部材240は回動せず、従動刃210を離間位置に維持する。   When the transmission member 230 moves forward by driving the thread trimmer motor 95, the driving blade 220 rotates counterclockwise as viewed from the bottom, and moves from the standby position toward the preparation position. As shown in FIG. 11, when the driving blade 220 moves from the standby position toward the preparation position, the roller member 265 moves from the cam surface 251 to the cam surface 252. Since the roller member 265 has a lower end positioned above the upper end of the protrusion 254 at the end of the protrusion 254 on the cam surface 251 side, the roller member 265 contacts the inclined surface 255 of the protrusion 254 and moves upward along the inclined surface 255. (Refer to the one-dot chain line in FIG. 10). Therefore, the roller member 265 does not contact the outer peripheral surface 256 of the protrusion 254 but contacts the cam surface 252. Since the cam surfaces 251 to 253 extend in the circumferential direction of the support shaft 9B, even if the roller member 265 moves from the cam surface 251 to the cam surface 252, the position in the front-rear direction does not change. Therefore, the link member 240 does not rotate and maintains the driven blade 210 in the separated position.

駆動刃220の回動によって、糸捌き部223は針穴9Aの形成位置を通る。糸捌き部223は、縫針7が針板9下側で形成した上糸環内に突入する。該時、上糸環のうち縫針7から延びる側は、糸係合部225に掛かる。糸係合部225は、上糸を掛けた状態で後方に移動し、上糸環のうち縫針7から延びる側を後方に誘導する。駆動刃220が準備位置に位置する時、上糸環のうち縫針7から延びる側は糸係合部225に接触し、針穴9Aを通って上方に延びた状態になる。従動刃210が離間位置にて位置を維持するので、駆動刃220が待機位置から準備位置に移動する過程で、駆動刃220と従動刃210は刃部224と刃部214が針穴9Aの形成位置で重ならない。   By the rotation of the driving blade 220, the threading portion 223 passes through the formation position of the needle hole 9A. The threading portion 223 enters the upper thread ring formed by the sewing needle 7 below the needle plate 9. At this time, the side of the upper thread ring extending from the sewing needle 7 is engaged with the thread engaging portion 225. The thread engaging portion 225 moves rearward with the upper thread hooked, and guides the upper thread ring extending from the sewing needle 7 rearward. When the driving blade 220 is located at the preparation position, the side of the upper thread ring that extends from the sewing needle 7 contacts the thread engaging portion 225 and extends upward through the needle hole 9A. Since the driven blade 210 maintains the position at the separated position, the drive blade 220 and the driven blade 210 form the needle portion 224 and the blade portion 214 forms the needle hole 9A in the process of moving the drive blade 220 from the standby position to the preparation position. Does not overlap in position.

駆動刃220の回動に伴い、コロ部材265は、カム面252からカム面253に移動する。コロ部材265が突部254の形成位置から離れると、圧縮バネ245はリンク部材240を付勢して、コロ部材265を下方に移動する。コロ部材265の下端は、突部254のカム面253側の端部において、突部254の上端よりも下側に位置する(図10の破線参照)。図12に示すように、駆動刃220が準備位置に移動した時、コロ部材265は、カム面253に位置する。カム面251〜253が支軸9Bの周方向に延びるので、コロ部材265は、カム面252からカム面253に移動しても、位置が変わらない。リンク部材240は回動せず、従動刃210を離間位置に維持する。   As the drive blade 220 rotates, the roller member 265 moves from the cam surface 252 to the cam surface 253. When the roller member 265 moves away from the position where the protrusion 254 is formed, the compression spring 245 urges the link member 240 to move the roller member 265 downward. The lower end of the roller member 265 is located below the upper end of the protrusion 254 at the end of the protrusion 254 on the cam surface 253 side (see the broken line in FIG. 10). As shown in FIG. 12, when the driving blade 220 moves to the preparation position, the roller member 265 is positioned on the cam surface 253. Since the cam surfaces 251 to 253 extend in the circumferential direction of the support shaft 9B, even if the roller member 265 moves from the cam surface 252 to the cam surface 253, the position does not change. The link member 240 does not rotate and maintains the driven blade 210 in the separated position.

糸切用モータ95の駆動によって伝達部材230が後方に移動すると、駆動刃220は底面視時計回りに回動し、準備位置から待機位置へ向けて移動する。駆動刃220が準備位置から待機位置に移動する過程で、糸捕捉部227は、上糸環のうち布から延びる側と下糸を糸捕捉部227の中央に誘導する。上糸環のうち布から延びる側と下糸は、一端部221上面に設けた凹部(図示略)に沿って、糸捕捉部227から刃部224に向けて延びる。   When the transmission member 230 moves rearward by driving the thread cutting motor 95, the driving blade 220 rotates clockwise as viewed from the bottom, and moves from the preparation position toward the standby position. In the process in which the driving blade 220 moves from the preparation position to the standby position, the yarn catcher 227 guides the upper thread ring on the side extending from the cloth and the lower thread to the center of the yarn catcher 227. The side of the upper thread ring that extends from the cloth and the lower thread extend from the thread catcher 227 toward the blade 224 along a recess (not shown) provided on the upper surface of the one end 221.

駆動刃220が準備位置から待機位置へ向けて移動する時、コロ部材265は、下端が突部254のカム面253側の端部において突部254の上端よりも下側に位置するので、カム面253から突部254の外周面256に移動する(図10の二点鎖線参照)。図13に示すように、突部254はコロ部材265を前方に押圧する。リンク部材240は底面視反時計回りに回動する。リンク部材240は、長穴243に係合するピン213を後方に押圧する。ピン213と長穴243は、リンク部材240の回動を従動刃210の直線状の移動に変換する。従動刃210は案内部201に沿って右斜め後方に移動し、接近位置に位置する。従動刃210が接近位置に位置する間、駆動刃220の刃部224は、針穴9Aの形成位置を、後方から前方へ向けて通過する。刃部224は、針穴9Aの形成位置を通過する時、従動刃210の刃部214と上下方向に交差する。該時の駆動刃220の位置は切断位置である。駆動刃220の刃部224と従動刃210の刃部214は、上糸環のうち布に向けて延びる側と下糸を挟み、夫々切断する。   When the driving blade 220 moves from the preparation position toward the standby position, the roller member 265 has a lower end positioned on the cam surface 253 side end of the protrusion 254 below the upper end of the protrusion 254. It moves from the surface 253 to the outer peripheral surface 256 of the protrusion 254 (see the two-dot chain line in FIG. 10). As shown in FIG. 13, the protrusion 254 presses the roller member 265 forward. The link member 240 rotates counterclockwise when viewed from the bottom. The link member 240 presses the pin 213 engaged with the elongated hole 243 backward. The pin 213 and the long hole 243 convert the rotation of the link member 240 into a linear movement of the driven blade 210. The driven blade 210 moves diagonally right rearward along the guide part 201 and is located at the approach position. While the driven blade 210 is located at the approach position, the blade portion 224 of the drive blade 220 passes through the formation position of the needle hole 9A from the rear toward the front. The blade portion 224 intersects the blade portion 214 of the driven blade 210 in the vertical direction when passing through the formation position of the needle hole 9A. The position of the driving blade 220 at this time is a cutting position. The blade portion 224 of the driving blade 220 and the blade portion 214 of the driven blade 210 sandwich the side of the upper thread ring that extends toward the cloth and the lower thread, and cut each.

糸切用モータ95の駆動によって伝達部材230が後方に移動し、駆動刃220は切断位置から待機位置に移動する。図8に示すように、伝達部材230の後方への移動によって、コロ部材265は、突部254の外周面256からカム面251に移動する。コロ部材265がカム面251に移動すると、リンク部材240は、引張バネ206の付勢によって底面視反時計回りに回動する。従動刃210は、引張バネ206の付勢によって左斜め前方へ移動し、離間位置に移動する。糸切機構200は、糸の切断を終了する。   The transmission member 230 moves rearward by driving the thread cutting motor 95, and the drive blade 220 moves from the cutting position to the standby position. As shown in FIG. 8, the roller member 265 moves from the outer peripheral surface 256 of the protrusion 254 to the cam surface 251 by the rearward movement of the transmission member 230. When the roller member 265 moves to the cam surface 251, the link member 240 rotates counterclockwise as viewed from the bottom by the biasing force of the tension spring 206. The driven blade 210 moves diagonally to the left forward by the urging force of the tension spring 206 and moves to the separated position. The yarn cutting mechanism 200 ends the yarn cutting.

ミシン1は、糸切リンク機構50を駆動し、駆動刃220を駆動すれば、移動機構260を介し、従動刃210を駆動できる。即ちミシン1は、従動刃210を駆動する為の駆動機構を、糸切リンク機構50の他に設ける必要がない。故にミシン1は、従動刃210の代わりに固定刃を用いた従来の構成の糸切機構と差し替えるだけで、糸切機構200を組み付けることができる。   The sewing machine 1 can drive the driven blade 210 via the moving mechanism 260 by driving the thread cutting link mechanism 50 and driving the driving blade 220. That is, the sewing machine 1 does not need to provide a drive mechanism for driving the driven blade 210 in addition to the thread cutting link mechanism 50. Therefore, the sewing machine 1 can be assembled with the thread trimming mechanism 200 only by replacing the conventional thread trimming mechanism using a fixed blade instead of the driven blade 210.

以上説明のように、第二実施形態では、移動機構260は外周カム250とコロ部材265である。外周カム250は形成が容易であり、且つ耐久性が高い。故に糸切機構200は長期に亘って確実に動作することができる。   As described above, in the second embodiment, the moving mechanism 260 is the outer peripheral cam 250 and the roller member 265. The outer peripheral cam 250 is easy to form and has high durability. Therefore, the thread trimming mechanism 200 can operate reliably over a long period of time.

駆動刃220が待機位置から準備位置に移動する時、コロ部材265を案内するカム面251〜253は、突部254を含まない。コロ部材265は突部254に当接しないので、従動刃210を離間位置に維持する。故に糸切機構200は、駆動刃220が切断位置で上糸と下糸を切断する前に、従動刃210の刃部214が上糸と下糸に触れて切断することを防止できる。   When the driving blade 220 moves from the standby position to the preparation position, the cam surfaces 251 to 253 that guide the roller member 265 do not include the protrusion 254. Since the roller member 265 does not come into contact with the protrusion 254, the driven blade 210 is maintained at the separated position. Therefore, the thread cutting mechanism 200 can prevent the blade portion 214 of the driven blade 210 from coming into contact with and cutting the upper thread and the lower thread before the driving blade 220 cuts the upper thread and the lower thread at the cutting position.

従動刃210は案内部201に沿って直線状に移動するので、上糸と下糸を切断するとき、駆動刃220に向ける刃部224の角度を一定に保つことができる。故に糸切機構200は、安定した糸切りを行うことができる。   Since the driven blade 210 moves linearly along the guide portion 201, the angle of the blade portion 224 directed toward the driving blade 220 can be kept constant when the upper thread and the lower thread are cut. Therefore, the thread trimming mechanism 200 can perform stable thread trimming.

駆動刃220は、長穴257内でのボルト229の位置に応じて外周カム250との位置関係を調整することで、糸切り時に従動刃210と噛み合う位置を調整できる。   The driving blade 220 can adjust the position where the driving blade 220 meshes with the driven blade 210 during thread trimming by adjusting the positional relationship with the outer peripheral cam 250 according to the position of the bolt 229 in the elongated hole 257.

図14〜図17を参照し、本発明の第三実施形態を説明する。第三実施形態に係るミシン1は、糸切機構300の構成が第一実施形態の糸切機構100の構成と異なる。ミシン1の他の構成は同じであるので、以下では糸切機構300の構成を説明し、他の構成の説明は省略する。以下の説明で、糸切機構300を構成する各部材の方向の説明は、駆動刃320が待機位置(図14参照)に位置する時の向きで説明する。   A third embodiment of the present invention will be described with reference to FIGS. The sewing machine 1 according to the third embodiment is different in the configuration of the yarn cutting mechanism 300 from the configuration of the yarn cutting mechanism 100 of the first embodiment. Since the other configurations of the sewing machine 1 are the same, the configuration of the thread trimming mechanism 300 will be described below, and the description of the other configurations will be omitted. In the following description, the direction of each member constituting the yarn cutting mechanism 300 will be described in the direction when the driving blade 320 is positioned at the standby position (see FIG. 14).

図14に示すように、糸切機構300は従動刃310、駆動刃320、伝達部材330、移動機構360を備える。従動刃310は板状で、一端部311から他端部312に向けて左斜め前方に延びる。一端部311側は、他端部312側よりも細幅に形成する。従動刃310は、一端部311に刃部314を設け、他端部312にピン313を備える。ピン313は下方に突出する。針板9は、下面に案内部301を備える。案内部301は、針穴9Aを従動刃310に沿って直線状に延びる溝状に形成する。案内部301の溝幅は、従動刃310の板幅と略同じである。従動刃310は、案内部301に係合し、一端部311を針穴9A側に向けて配置する。底面視U字状の押え板304は、案内部301の右端の一部と左端と後端に沿って設ける。押え板304は、従動刃310の縁部を下側から押え、従動刃310を案内部301内で直線状に移動可能に保持する。押え板304は、螺子361で針板9に固定する。螺子361は、下流回動部材380の左端部387に当接して従動刃310の左斜め前方への移動を規制する。   As shown in FIG. 14, the thread cutting mechanism 300 includes a driven blade 310, a driving blade 320, a transmission member 330, and a moving mechanism 360. The driven blade 310 is plate-shaped, and extends obliquely leftward from the one end 311 toward the other end 312. The one end 311 side is formed narrower than the other end 312 side. The driven blade 310 includes a blade portion 314 at one end 311 and a pin 313 at the other end 312. The pin 313 protrudes downward. The needle plate 9 includes a guide portion 301 on the lower surface. The guide part 301 forms the needle hole 9 </ b> A in a groove shape extending linearly along the driven blade 310. The groove width of the guide portion 301 is substantially the same as the plate width of the driven blade 310. The driven blade 310 engages with the guide portion 301 and is arranged with one end portion 311 facing the needle hole 9A. The U-shaped presser plate 304 in the bottom view is provided along a part of the right end, the left end, and the rear end of the guide portion 301. The presser plate 304 presses the edge of the driven blade 310 from below, and holds the driven blade 310 movably in a straight line within the guide portion 301. The presser plate 304 is fixed to the needle plate 9 with screws 361. The screw 361 abuts on the left end portion 387 of the downstream rotating member 380 and restricts the movement of the driven blade 310 obliquely forward to the left.

従動刃310は、案内部301の案内によって、離間位置と接近位置の間を直線状に移動する。従動刃310は、離間位置に位置する時、案内部301の左斜め前側の端部に位置する。針板9は、案内部301の左斜め前方に、下方に突出するピン302を備える。引張バネ306は、従動刃310のピン313と針板9のピン302の間に掛け留める。引張バネ306は、従動刃310を左斜め前方に付勢する。   The driven blade 310 moves linearly between the separated position and the approach position by the guidance of the guide unit 301. When the driven blade 310 is positioned at the separated position, the driven blade 310 is positioned at the end of the guide portion 301 on the diagonally left front side. The needle plate 9 includes a pin 302 that protrudes downward and diagonally to the left of the guide portion 301. The tension spring 306 is hooked between the pin 313 of the driven blade 310 and the pin 302 of the needle plate 9. The tension spring 306 biases the driven blade 310 obliquely forward to the left.

移動機構360は、下流回動部材380、上流回動部材340、コロ部材365を含む。下流回動部材380は、第一部材381と第二部材386を備える。第二部材386は、底面視略L字状に屈曲する板状で、両端部が屈曲部分から夫々左斜め後方と前方に延びる。第二部材386は、屈曲部分に軸穴(図示略)を有する。軸穴は、支軸303に係合する。支軸303は針板9下面に設け、案内部301の右斜め前方に位置する。支軸303は、第二部材386を水平に往復回動可能に支持する。第二部材386の左斜め後方に延びる端部は、下流回動部材380の左端部387を構成する。左端部387は、左端部387が延びる方向に沿う長穴388を有する。従動刃310のピン313は、下流回動部材380の長穴388に係合し、長穴388内を移動可能である。螺子穴389は第二部材386の前方に延びる端部に形成する。   The moving mechanism 360 includes a downstream rotating member 380, an upstream rotating member 340, and a roller member 365. The downstream rotating member 380 includes a first member 381 and a second member 386. The second member 386 has a plate shape that is bent in a substantially L shape when viewed from the bottom, and both ends extend obliquely leftward and forward from the bent portion, respectively. The second member 386 has a shaft hole (not shown) at the bent portion. The shaft hole engages with the support shaft 303. The support shaft 303 is provided on the lower surface of the throat plate 9 and is positioned diagonally to the right of the guide portion 301. The support shaft 303 supports the second member 386 in a horizontally reciprocable manner. The end portion of the second member 386 that extends diagonally to the left is a left end portion 387 of the downstream rotating member 380. The left end portion 387 has a long hole 388 along the direction in which the left end portion 387 extends. The pin 313 of the driven blade 310 engages with the elongated hole 388 of the downstream rotating member 380 and can move within the elongated hole 388. The screw hole 389 is formed at an end portion extending forward of the second member 386.

第一部材381は、底面視略L字状に屈曲する板状で、両端部が屈曲部分から夫々後方と右方に延びる。第一部材381は、後側に延びる端部に軸穴(図示略)を有する。軸穴は、支軸303に係合する。第一部材381は、屈曲部分に、上下方向に貫通し、左右方向に延びる長穴382を有する。第一部材381の右方に延びる端部は、下流回動部材380の右端部383を構成する。右端部383は、当接部384と掛留部385を備える。当接部384は、右端部383から後方に突出する部分である。当接部384は、上流回動部材340の作用突出部342に当接する。掛留部385は、当接部384の前方にて下方に突出し、引張バネ307の一端を掛け留める。   The first member 381 has a plate shape that is bent in a substantially L shape when viewed from the bottom, and both end portions extend rearward and rightward from the bent portion, respectively. The first member 381 has a shaft hole (not shown) at the end extending to the rear side. The shaft hole engages with the support shaft 303. The first member 381 has a long hole 382 that penetrates in the up-down direction and extends in the left-right direction at the bent portion. An end portion extending rightward of the first member 381 constitutes a right end portion 383 of the downstream rotating member 380. The right end 383 includes a contact part 384 and a hanging part 385. The contact portion 384 is a portion that protrudes rearward from the right end portion 383. The abutting portion 384 abuts on the action projecting portion 342 of the upstream rotating member 340. The hanging portion 385 projects downward in front of the contact portion 384 and hooks one end of the tension spring 307.

第一部材381と第二部材386は、夫々の軸穴を支軸303に係合し、第一部材381を第二部材386の下側に重ねて配置する。第二部材386の螺子穴389は、第一部材381の長穴382の位置に対応する。第一部材381と第二部材386は、螺子穴389の位置を長穴382の範囲内で移動することで、互いの位置を水平にずらすことができる。ボルト308は螺子穴389に締結し、第一部材381と第二部材386を一体に固定する。第一部材381と第二部材386が一体になった下流回動部材380は、支軸303を中心に回動する。第一部材381と第二部材386の位置関係を調整することで、後述する上流回動部材340のコロ突出部341に駆動刃320のコロ部材365が作用するタイミングが変わる。即ち糸切機構300は、移動機構360が従動刃310を動作するタイミングをずらすことができる。故に糸切機構300は、上糸と下糸の切断時に駆動刃320の刃部324と従動刃310の刃部314が交差する位置を調整できる。   The first member 381 and the second member 386 have their respective shaft holes engaged with the support shaft 303, and the first member 381 is placed on the lower side of the second member 386. The screw hole 389 of the second member 386 corresponds to the position of the elongated hole 382 of the first member 381. The positions of the first member 381 and the second member 386 can be shifted horizontally by moving the position of the screw hole 389 within the range of the elongated hole 382. The bolt 308 is fastened to the screw hole 389 to fix the first member 381 and the second member 386 together. The downstream rotating member 380 in which the first member 381 and the second member 386 are integrated rotates about the support shaft 303. By adjusting the positional relationship between the first member 381 and the second member 386, the timing at which the roller member 365 of the driving blade 320 acts on the roller protrusion 341 of the upstream rotating member 340 described later is changed. That is, the thread cutting mechanism 300 can shift the timing at which the moving mechanism 360 operates the driven blade 310. Therefore, the thread cutting mechanism 300 can adjust the position where the blade part 324 of the driving blade 320 and the blade part 314 of the driven blade 310 intersect when cutting the upper thread and the lower thread.

上流回動部材340は底面視略L字状に屈曲する板状で、屈曲部分に軸穴(図示略)を有する。支軸309は軸穴に係合し、上流回動部材340は支軸309を中心に回動する。支軸309は針板9下面に設け、支軸303の右側に位置する。下流回動部材380の右端部383側の部分は、支軸309の左側から前側を回り込み、当接部384を支軸309の右側に配置する。上流回動部材340は、コロ突出部341と作用突出部342を備える。コロ突出部341は、軸穴から支軸309の径方向外側である後方に突出する。コロ突出部341は、駆動刃320のコロ部材365に当接可能である。作用突出部342は、軸穴から右方に突出する。作用突出部342は、下流回動部材380の当接部384に当接可能である。作用突出部342は、基端部分に下方に突出するピン343を備える。引張バネ307は、下流回動部材380の右端部383に設けた掛留部385と、作用突出部342のピン343の間に掛け留める。引張バネ307は、上流回動部材340を底面視反時計回りに付勢する。コロ突出部341にコロ部材365が当接しない時、引張バネ307によって作用突出部342は下流回動部材380の当接部384に当接し、コロ突出部341は後方へ向く。   The upstream turning member 340 has a plate shape bent in a substantially L shape when viewed from the bottom, and has a shaft hole (not shown) at the bent portion. The support shaft 309 engages with the shaft hole, and the upstream rotation member 340 rotates about the support shaft 309. The support shaft 309 is provided on the lower surface of the needle plate 9 and is located on the right side of the support shaft 303. The portion on the right end 383 side of the downstream rotating member 380 wraps around the front side from the left side of the support shaft 309, and the contact portion 384 is arranged on the right side of the support shaft 309. The upstream turning member 340 includes a roller protrusion 341 and an action protrusion 342. The roller protrusion 341 protrudes rearward from the shaft hole, which is the radially outer side of the support shaft 309. The roller protrusion 341 can contact the roller member 365 of the drive blade 320. The action protrusion 342 protrudes rightward from the shaft hole. The action protrusion 342 can contact the contact portion 384 of the downstream rotating member 380. The action protrusion 342 includes a pin 343 protruding downward at the base end portion. The tension spring 307 is hooked between the hanging portion 385 provided at the right end portion 383 of the downstream rotating member 380 and the pin 343 of the action protruding portion 342. The tension spring 307 biases the upstream rotating member 340 counterclockwise as viewed from the bottom. When the roller member 365 does not contact the roller protrusion 341, the action protrusion 342 contacts the contact portion 384 of the downstream rotating member 380 by the tension spring 307, and the roller protrusion 341 faces rearward.

駆動刃320の形状は、左右方向に延びる板状である。駆動刃320は中間部分に、支軸9Bに係合する軸穴(図示略)を有する。支軸9Bは、駆動刃320を水平に往復回動可能に支持する。駆動刃320は一端部321、他端部322を備える。一端部321は軸穴の左方に延び、他端部322は軸穴の右方に延びる。一端部321は、糸捌き部323、刃部324、糸係合部325、糸案内部326、糸捕捉部327を有する。糸捌き部323、刃部324、糸係合部325、糸案内部326、糸捕捉部327の構成は、第一実施形態の糸捌き部123、刃部124、糸係合部125、糸案内部126、糸捕捉部127の構成と同様なので、説明を省略する。他端部322は、下方に突出するピン319を備える。ピン319は、伝達部材330の先端部331の貫通穴333に係合する。駆動刃320は、伝達部材330と回動可能に連結する。駆動刃320は、軸穴の前方に突出する突出部328を有する。突出部328は、下方に突出するコロ部材365を備える。   The shape of the driving blade 320 is a plate shape extending in the left-right direction. The drive blade 320 has a shaft hole (not shown) that engages with the support shaft 9B in an intermediate portion. The support shaft 9B supports the drive blade 320 so as to be horizontally reciprocally rotatable. The driving blade 320 includes one end 321 and the other end 322. One end 321 extends to the left of the shaft hole, and the other end 322 extends to the right of the shaft hole. The one end 321 includes a threading portion 323, a blade portion 324, a thread engaging portion 325, a yarn guiding portion 326, and a yarn catching portion 327. The configurations of the threading unit 323, the blade unit 324, the thread engaging unit 325, the thread guiding unit 326, and the thread catching unit 327 are the same as the threading unit 123, the blade unit 124, the thread engaging unit 125, and the thread guide of the first embodiment. Since it is the same as the structure of the part 126 and the thread | yarn capture part 127, description is abbreviate | omitted. The other end 322 includes a pin 319 protruding downward. The pin 319 engages with the through hole 333 of the distal end portion 331 of the transmission member 330. The driving blade 320 is rotatably connected to the transmission member 330. The drive blade 320 has a protrusion 328 that protrudes in front of the shaft hole. The protrusion 328 includes a roller member 365 that protrudes downward.

伝達部材330は、第二実施形態の伝達部材230と同様の構成である。伝達部材330は、駆動刃320のピン319が貫通穴333に係合する以外は伝達部材230と同様なので、説明を省略する。   The transmission member 330 has the same configuration as the transmission member 230 of the second embodiment. Since the transmission member 330 is the same as the transmission member 230 except that the pin 319 of the drive blade 320 engages with the through hole 333, the description thereof is omitted.

糸切機構300の動作を説明する。縫製終了時、糸切用モータ95は出力軸を駆動する。糸切リンク機構50は、カム板70の回転方向と角度に応じて駆動し、糸切機構300の伝達部材330を前後方向へ往復移動する。図14〜図17に示すように、伝達部材330が前後方向へ往復移動する時、駆動刃320は、支軸9Bを中心に水平に往復回動し、待機位置(図14参照)と準備位置(図16参照)の間を往復移動する。駆動刃320が待機位置に位置する時、伝達部材330は、前後方向への移動範囲において最も後方に位置する。糸切機構300は、糸切時以外は駆動刃320を待機位置に配置する。駆動刃320が準備位置に位置する時、伝達部材330は、前後方向への移動範囲において最も前方に位置する。駆動刃320が待機位置と準備位置の間で移動する時、刃部324は、支軸9Bを中心とする円弧状の回動軌跡に沿って移動する。該時、刃部324は針穴9Aの形成位置を通過する。   The operation of the thread cutting mechanism 300 will be described. At the end of sewing, the thread trimming motor 95 drives the output shaft. The thread trimming link mechanism 50 is driven according to the rotation direction and angle of the cam plate 70, and reciprocates the transmission member 330 of the thread trimming mechanism 300 in the front-rear direction. As shown in FIGS. 14 to 17, when the transmission member 330 reciprocates in the front-rear direction, the drive blade 320 reciprocates horizontally around the support shaft 9 </ b> B, and a standby position (see FIG. 14) and a preparation position. (See FIG. 16). When the driving blade 320 is positioned at the standby position, the transmission member 330 is positioned most rearward in the range of movement in the front-rear direction. The thread cutting mechanism 300 arranges the driving blade 320 at the standby position except during thread cutting. When the driving blade 320 is positioned at the preparation position, the transmission member 330 is positioned most forward in the range of movement in the front-rear direction. When the driving blade 320 moves between the standby position and the preparation position, the blade portion 324 moves along an arcuate rotation locus centering on the support shaft 9B. At this time, the blade portion 324 passes through the formation position of the needle hole 9A.

引張バネ306は、下流回動部材380を支軸303を中心に底面視時計回り方向に付勢する。下流回動部材380の右端部383に掛け留めた引張バネ307は、上流回動部材340のピン343を前方に付勢する。上流回動部材340の作用突出部342は右方に延び、コロ突出部341は後方に延びる。上流回動部材340の作用突出部342は下流回動部材380の当接部384に当接する。駆動刃320が待機位置にある時、コロ部材365は、コロ突出部341の右方に離れて位置する。コロ部材365は、上流回動部材340に駆動力を伝達しない状態である。引張バネ306の付勢によって、従動刃310は、案内部301の左斜め前側の端部に位置する。故に下流回動部材380は回動せず、従動刃310を離間位置に維持する。   The tension spring 306 urges the downstream rotating member 380 in the clockwise direction in the bottom view around the support shaft 303. The tension spring 307 hung on the right end 383 of the downstream rotating member 380 biases the pin 343 of the upstream rotating member 340 forward. The action protrusion 342 of the upstream rotation member 340 extends rightward, and the roller protrusion 341 extends rearward. The action protrusion 342 of the upstream rotation member 340 contacts the contact portion 384 of the downstream rotation member 380. When the driving blade 320 is in the standby position, the roller member 365 is positioned to the right of the roller protrusion 341. The roller member 365 is in a state where no driving force is transmitted to the upstream rotating member 340. Due to the biasing force of the tension spring 306, the driven blade 310 is positioned at the end of the guide portion 301 on the diagonally left front side. Therefore, the downstream rotation member 380 does not rotate, and the driven blade 310 is maintained in the separated position.

糸切用モータ95の駆動によって伝達部材330が前方に移動すると、駆動刃320は底面視反時計回りに回動し、待機位置から準備位置へ向けて移動する。図15に示すように、駆動刃320が待機位置から準備位置へ向けて移動する時、コロ部材365は左側に移動し、上流回動部材340のコロ突出部341に右方から当接する。コロ部材365は、コロ突出部341を左方に押圧する。上流回動部材340は底面視時計回りに回動する。作用突出部342は、後方に移動し、下流回動部材380の当接部384から離れる。引張バネ307は伸張するが、従動刃310は、案内部301の左斜め前側の端部に位置するので移動しない。故に下流回動部材380は回動せず、従動刃310を離間位置に維持する。   When the transmission member 330 moves forward by driving the thread cutting motor 95, the driving blade 320 rotates counterclockwise as viewed from the bottom, and moves from the standby position toward the preparation position. As shown in FIG. 15, when the driving blade 320 moves from the standby position toward the preparation position, the roller member 365 moves to the left and contacts the roller protrusion 341 of the upstream rotation member 340 from the right. The roller member 365 presses the roller protrusion 341 leftward. The upstream rotation member 340 rotates clockwise when viewed from the bottom. The action protrusion 342 moves rearward and moves away from the contact portion 384 of the downstream rotating member 380. The tension spring 307 extends, but the driven blade 310 does not move because it is located at the end of the guide portion 301 on the left diagonal front side. Therefore, the downstream rotation member 380 does not rotate, and the driven blade 310 is maintained in the separated position.

駆動刃320の回動によって、糸捌き部323は針穴9Aの形成位置を通る。糸捌き部323は、縫針7が針板9下側で形成した上糸環内に突入する。該時、上糸環のうち縫針7から延びる側は、糸係合部325に掛かる。糸係合部325は、上糸を掛けた状態で後方に移動し、上糸環のうち縫針7から延びる側を後方に誘導する。駆動刃320が準備位置に位置する時、上糸環のうち縫針7から延びる側は糸係合部325に接触し、針穴9Aを通って上方に延びた状態になる。従動刃310が離間位置にて位置を維持するので、駆動刃320が待機位置から準備位置に移動する過程で、駆動刃320と従動刃310は刃部324と刃部314が針穴9Aの形成位置で重ならない。   By the rotation of the driving blade 320, the threading portion 323 passes through the formation position of the needle hole 9A. The threading portion 323 enters the upper thread ring formed by the sewing needle 7 below the needle plate 9. At this time, the side of the upper thread ring that extends from the sewing needle 7 is engaged with the thread engaging portion 325. The thread engaging portion 325 moves rearward with the upper thread being hung, and guides the side of the upper thread ring extending from the sewing needle 7 rearward. When the driving blade 320 is located at the preparation position, the side of the upper thread ring that extends from the sewing needle 7 contacts the thread engaging portion 325 and extends upward through the needle hole 9A. Since the driven blade 310 maintains the position at the separated position, the drive blade 320 and the driven blade 310 form the needle portion 324 and the blade portion 314 form the needle hole 9A in the process in which the drive blade 320 moves from the standby position to the preparation position. Does not overlap in position.

駆動刃320の回動に伴い、コロ部材365は、上流回動部材340を底面視反時計回りに回動しながらコロ突出部341の先端部分を通過する。コロ部材365がコロ突出部341の左側に移動すると、上流回動部材340は、引張バネ307の付勢によって、底面視反時計回りに回動する。作用突出部342は、下流回動部材380の当接部384に当接する。上流回動部材340は回動を停止する。図16に示すように、駆動刃320が準備位置に移動した時、コロ部材365は、コロ突出部341の左方に離れて位置する。従動刃310は、案内部301の左斜め前側の端部にて位置を維持する。故に下流回動部材380は回動せず、従動刃310を離間位置に維持する。   As the driving blade 320 rotates, the roller member 365 passes through the tip of the roller protrusion 341 while rotating the upstream rotation member 340 counterclockwise as viewed from the bottom. When the roller member 365 moves to the left side of the roller protrusion 341, the upstream rotation member 340 rotates counterclockwise as viewed from the bottom by the biasing force of the tension spring 307. The action protrusion 342 contacts the contact portion 384 of the downstream rotating member 380. The upstream rotation member 340 stops rotating. As shown in FIG. 16, when the driving blade 320 moves to the preparation position, the roller member 365 is positioned to the left of the roller protrusion 341. The driven blade 310 maintains its position at the end of the guide portion 301 on the left diagonal front side. Therefore, the downstream rotation member 380 does not rotate, and the driven blade 310 is maintained in the separated position.

糸切用モータ95の駆動によって伝達部材330が後方に移動すると、駆動刃320は底面視時計回りに回動し、準備位置から待機位置へ向けて移動する。駆動刃320が準備位置から待機位置に移動する過程で、糸捕捉部327は、上糸環のうち布から延びる側と下糸を糸捕捉部327の中央に誘導する。上糸環のうち布から延びる側と下糸は、一端部321上面に設けた凹部(図示略)に沿って、糸捕捉部327から刃部324に向けて延びる。   When the transmission member 330 moves rearward by driving the thread trimmer motor 95, the driving blade 320 rotates clockwise from the bottom and moves from the preparation position toward the standby position. In the process in which the driving blade 320 moves from the preparation position to the standby position, the yarn catcher 327 guides the upper thread ring on the side extending from the cloth and the lower thread to the center of the yarn catcher 327. The side of the upper thread ring that extends from the cloth and the lower thread extend from the thread catcher 327 toward the blade 324 along a recess (not shown) provided on the upper surface of the one end 321.

図17に示すように、駆動刃320が準備位置から待機位置へ向けて移動する時、コロ部材365は右側に移動し、コロ突出部341に左方から当接する。コロ部材365は、コロ突出部341を右方に押圧する。上流回動部材340は、底面視反時計回りに回動する。作用突出部342は引張バネ307の付勢に抗して前方へ移動し、下流回動部材380の当接部384を前方に押圧する。下流回動部材380は、支軸303を中心に底面視反時計回りに回動する。下流回動部材380は、長穴388に係合するピン313を後方に押圧する。ピン313と長穴388は、下流回動部材380の回動を従動刃310の直線状の移動に変換する。従動刃310は案内部301に沿って右斜め後方に移動し、接近位置に位置する。従動刃310が接近位置に位置する間、駆動刃320の刃部324は、針穴9Aの形成位置を、後方から前方へ向けて通過する。刃部324は、針穴9Aの形成位置を通過する時、従動刃310の刃部314と上下方向に交差する。該時の駆動刃320の位置は切断位置である。駆動刃320の刃部324と従動刃310の刃部314は、上糸環のうち布に向けて延びる側と下糸を挟み、夫々切断する。   As shown in FIG. 17, when the driving blade 320 moves from the preparation position toward the standby position, the roller member 365 moves to the right side and contacts the roller protrusion 341 from the left side. The roller member 365 presses the roller protrusion 341 to the right. The upstream rotation member 340 rotates counterclockwise when viewed from the bottom. The action protrusion 342 moves forward against the biasing force of the tension spring 307 and presses the contact portion 384 of the downstream rotating member 380 forward. The downstream rotation member 380 rotates about the support shaft 303 counterclockwise as viewed from the bottom. The downstream rotating member 380 presses the pin 313 engaged with the elongated hole 388 backward. The pin 313 and the long hole 388 convert the rotation of the downstream rotation member 380 into the linear movement of the driven blade 310. The driven blade 310 moves diagonally right rearward along the guide portion 301 and is positioned at the approach position. While the driven blade 310 is located at the approach position, the blade portion 324 of the drive blade 320 passes the formation position of the needle hole 9A from the rear toward the front. The blade portion 324 intersects the blade portion 314 of the driven blade 310 in the vertical direction when passing the formation position of the needle hole 9A. The position of the driving blade 320 at this time is a cutting position. The blade portion 324 of the driving blade 320 and the blade portion 314 of the driven blade 310 sandwich the side of the upper thread ring that extends toward the cloth and the lower thread, and cut each.

糸切用モータ95の駆動によって伝達部材330が後方に移動し、駆動刃320は切断位置から待機位置に移動する。駆動刃320の回動に伴い、コロ部材365は、上流回動部材340を底面視反時計回りに回動しながらコロ突出部341の先端部分を通過する。コロ部材365は、コロ突出部341の右側に移動すると、上流回動部材340に駆動力を伝達しない状態になる。引張バネ306は、下流回動部材380を底面視時計回りに回動し、且つ従動刃310を案内部301の左斜め前方に移動する。図14に示すように、従動刃310は引張バネ306の付勢によって離間位置に位置する。駆動刃320が待機位置に移動し、糸切機構300は、糸の切断を終了する。   The transmission member 330 is moved backward by driving the thread cutting motor 95, and the drive blade 320 is moved from the cutting position to the standby position. As the driving blade 320 rotates, the roller member 365 passes through the tip of the roller protrusion 341 while rotating the upstream rotation member 340 counterclockwise as viewed from the bottom. When the roller member 365 moves to the right side of the roller protrusion 341, the roller member 365 is not transmitted to the upstream rotating member 340. The tension spring 306 rotates the downstream rotating member 380 clockwise as viewed from the bottom, and moves the driven blade 310 diagonally to the left of the guide portion 301. As shown in FIG. 14, the driven blade 310 is located at the separated position by the biasing force of the tension spring 306. The driving blade 320 moves to the standby position, and the yarn cutting mechanism 300 ends the yarn cutting.

ミシン1は、糸切リンク機構50を駆動し、駆動刃320を駆動すれば、移動機構360を介し、従動刃310を駆動できる。即ちミシン1は、従動刃310を駆動する為の駆動機構を、糸切リンク機構50の他に設ける必要がない。故にミシン1は、従動刃310の代わりに固定刃を用いた従来の構成の糸切機構と差し替えるだけで、糸切機構300を組み付けることができる。   The sewing machine 1 can drive the driven blade 310 via the moving mechanism 360 by driving the thread cutting link mechanism 50 and driving the driving blade 320. That is, the sewing machine 1 does not need to provide a drive mechanism for driving the driven blade 310 in addition to the thread cutting link mechanism 50. Therefore, the sewing machine 1 can be assembled with the thread cutting mechanism 300 only by replacing the conventional thread cutting mechanism using a fixed blade instead of the driven blade 310.

以上説明のように、第三実施形態では、駆動刃320が準備位置から切断位置に移動する時、コロ部材365が上流回動部材340を回動しても作用突出部342は下流回動部材380に接触しない。よって下流回動部材380は回動せず、従動刃310を離間位置に維持する。故に糸切機構300は、駆動刃320が切断位置で上糸と下糸を切断する前に、従動刃310の刃先が上糸と下糸に触れて切断することを防止できる。   As described above, in the third embodiment, when the driving blade 320 moves from the preparation position to the cutting position, even if the roller member 365 rotates the upstream rotation member 340, the action projecting portion 342 is the downstream rotation member. Do not touch 380. Therefore, the downstream rotation member 380 does not rotate, and the driven blade 310 is maintained at the separated position. Therefore, the thread cutting mechanism 300 can prevent the cutting edge of the driven blade 310 from touching and cutting the upper thread and the lower thread before the driving blade 320 cuts the upper thread and the lower thread at the cutting position.

従動刃310は直線状に移動するので、上糸と下糸を切断するとき、駆動刃320に向ける刃先の角度を一定に保つことができる。故に糸切機構300は、安定した糸切りを行うことができる。   Since the driven blade 310 moves linearly, the angle of the blade edge directed toward the drive blade 320 can be kept constant when the upper thread and the lower thread are cut. Therefore, the thread trimming mechanism 300 can perform stable thread trimming.

下流回動部材380は、長穴382内での螺子穴389の位置に応じて第一部材381と第二部材386との位置関係を調整することで、糸切り時に従動刃310と駆動刃320とが噛み合う位置を調整できる。   The downstream rotating member 380 adjusts the positional relationship between the first member 381 and the second member 386 in accordance with the position of the screw hole 389 in the elongated hole 382, so that the driven blade 310 and the driving blade 320 at the time of thread trimming. Can be adjusted.

本発明は上記各実施形態に限定されず、種々の変更を加えることが可能である。第一実施形態の糸切機構100では、支軸9Bは、従動刃110と駆動刃120を同軸で回動可能に支持する。これに限らず、従動刃110と駆動刃120は、夫々別の支軸が回動可能に支持してもよい。   The present invention is not limited to the above embodiments, and various modifications can be made. In the yarn cutting mechanism 100 of the first embodiment, the support shaft 9B supports the driven blade 110 and the driving blade 120 so as to be rotatable coaxially. Not limited to this, the driven blade 110 and the driving blade 120 may be supported so that different support shafts can rotate.

第二実施形態の糸切機構200では、外周カム250の突部254の上面は、カム面251側からカム面253側へ向けて上方に傾斜する傾斜面255を形成する。これに限らず、傾斜面255は設けなくてもよい。該場合、外周カム250はカム面252を省略し、突部254を上下方向の全てに亙って設けてもよい。   In the thread trimming mechanism 200 of the second embodiment, the upper surface of the protrusion 254 of the outer circumferential cam 250 forms an inclined surface 255 that is inclined upward from the cam surface 251 side toward the cam surface 253 side. Not limited to this, the inclined surface 255 may not be provided. In this case, the outer peripheral cam 250 may omit the cam surface 252 and provide the protrusions 254 over the entire vertical direction.

第二実施形態の糸切機構200は、カム部材270と駆動刃220の位置関係を調整し、移動機構260が従動刃210を動作するタイミングを調整した。これに限らず、糸切機構200は、例えばリンク部材240を二つの部材で構成し、リンク部材240が屈曲する角度を調整することで、従動刃210の動作タイミングを調整してもよい。カム部材270と駆動刃220の位置関係は調整できなくてもよい。該場合、カム部材270と駆動刃220は互いに固定してもよく、一体的に形成してもよい。   The thread cutting mechanism 200 of the second embodiment adjusts the positional relationship between the cam member 270 and the driving blade 220, and adjusts the timing at which the moving mechanism 260 operates the driven blade 210. Not limited to this, the thread cutting mechanism 200 may adjust the operation timing of the driven blade 210 by, for example, configuring the link member 240 with two members and adjusting the angle at which the link member 240 bends. The positional relationship between the cam member 270 and the drive blade 220 may not be adjustable. In this case, the cam member 270 and the driving blade 220 may be fixed to each other or may be formed integrally.

第三実施形態の糸切機構300は、下流回動部材380の第一部材381と第二部材386の位置関係を調整し、移動機構360が従動刃310を動作するタイミングを調整した。これに限らず、糸切機構300は、例えばコロ部材365の位置を駆動刃320に対して回動の周方向にずらす調整を行って、従動刃310の動作タイミングを調整してもよい。下流回動部材380の第一部材381と第二部材386の位置関係は調整できなくてもよい。該場合、第一部材381と第二部材386は互いに固定してもよく、一体的に形成してもよい。   The thread cutting mechanism 300 of the third embodiment adjusts the positional relationship between the first member 381 and the second member 386 of the downstream rotating member 380 and adjusts the timing at which the moving mechanism 360 operates the driven blade 310. However, the thread cutting mechanism 300 may adjust the operation timing of the driven blade 310 by adjusting the position of the roller member 365 in the circumferential direction of rotation with respect to the drive blade 320, for example. The positional relationship between the first member 381 and the second member 386 of the downstream rotating member 380 may not be adjustable. In this case, the first member 381 and the second member 386 may be fixed to each other or may be formed integrally.

第二実施形態の糸切機構200では、従動刃210は、案内部201の案内で離間位置と接近位置の間を直線状に移動する。これに限らず、従動刃210の離間位置と接近位置の間の移動は、直線状でなく、円弧状でもよい。該場合、針板9は、下面に案内部201を備えなくてもよい。従動刃210は他端部212にピン213を備えず、リンク部材240は左端部241に長穴243を有さずに従動刃210の他端部212を固定してもよい。   In the yarn cutting mechanism 200 of the second embodiment, the driven blade 210 moves linearly between the separated position and the approach position by the guide of the guide unit 201. The movement between the separated position and the approach position of the driven blade 210 is not limited to this, but may be an arc shape instead of a linear shape. In this case, the needle plate 9 may not include the guide portion 201 on the lower surface. The driven blade 210 may not include the pin 213 at the other end portion 212, and the link member 240 may fix the other end portion 212 of the driven blade 210 without having the long hole 243 at the left end portion 241.

第三実施形態の糸切機構300では、従動刃310は、案内部301の案内で離間位置と接近位置の間を直線状に移動する。これに限らず、従動刃310の離間位置と接近位置の間の移動は、直線状でなく、円弧状でもよい。該場合、針板9は、下面に案内部301を備えなくてもよい。従動刃310は他端部312にピン313を備えず、下流回動部材380は左端部387に長穴388を有さずに従動刃310の他端部312を固定してもよい。   In the thread cutting mechanism 300 of the third embodiment, the driven blade 310 moves linearly between the separated position and the approach position by the guide of the guide unit 301. However, the movement between the separated position and the approach position of the driven blade 310 is not limited to a straight line but may be an arc. In this case, the needle plate 9 may not include the guide portion 301 on the lower surface. The driven blade 310 may not include the pin 313 at the other end 312, and the downstream rotating member 380 may fix the other end 312 of the driven blade 310 without the elongated hole 388 at the left end 387.

第二実施形態の糸切機構200は、圧縮バネ245でリンク部材240ごとコロ部材265を下方に付勢した。これに限らず、糸切機構200は、コロ部材365をリンク部材240の右端部242に対して下方に付勢する部材を設けてもよい。   The thread trimming mechanism 200 according to the second embodiment urges the roller member 265 downward together with the link member 240 by the compression spring 245. Not limited to this, the thread trimming mechanism 200 may be provided with a member that urges the roller member 365 downward with respect to the right end portion 242 of the link member 240.

第三実施形態の糸切機構300は、引張バネ307で上流回動部材340を底面視反時計回りに付勢した。これに限らず、糸切機構300は、例えば支軸309に係合し、針板9に対して上流回動部材340を底面視反時計回りに付勢する巻きバネを設けてもよい。   The thread trimmer mechanism 300 of the third embodiment urges the upstream rotating member 340 counterclockwise as viewed from the bottom by the tension spring 307. For example, the thread trimmer mechanism 300 may be provided with a winding spring that engages with the support shaft 309 and biases the upstream rotating member 340 counterclockwise as viewed from the bottom with respect to the needle plate 9.

第三実施形態の糸切機構300では、上流回動部材340は底面視略L字状に屈曲する板状である。これに限らず、上流回動部材340はコロ突出部341と作用突出部342を備えれば、底面視略三角形状等でもよい。   In the thread trimming mechanism 300 according to the third embodiment, the upstream rotating member 340 has a plate shape that is bent in a substantially L shape when viewed from the bottom. However, the upstream rotation member 340 may have a substantially triangular shape as viewed from the bottom as long as the upstream rotation member 340 includes the roller protrusion 341 and the action protrusion 342.

上記実施形態において、従動刃110,210,310が、本発明の「第一刃」に相当する。刃部114,214,314が、本発明の第一刃の「刃先」に相当する。駆動刃120,220,320が、本発明の「第二刃」に相当する。刃部124,224,324が、本発明の第二刃の「刃先」に相当する。糸切用モータ95が、本発明の「動力源」に相当する。後端部152が、本発明の溝カムの「端部」に相当する。中間部153が、本発明の溝カムの「屈曲部分」に相当する。支軸9Bが、本発明の「軸部」に相当する。引張バネ206,306が、本発明の「第一付勢部材」に相当する。右端部242が、本発明のリンク部材の「一端」に相当する。左端部241が、本発明のリンク部材の「他端」に相当する。圧縮バネ245が、本発明の「第二付勢部材」に相当する。長穴257が、本発明の「穴部」に相当する。ボルト229とナット205が、本発明の「固定部材」に相当する。支軸309が、本発明の「上流支軸」に相当する。支軸303が、本発明の「下流支軸」に相当する。右端部383が、本発明の下流回動部材の「一端部」に相当する。左端部387が、本発明の下流回動部材の「他端部」に相当する。長穴382が、本発明の「調整穴」に相当する。螺子穴389とボルト308が、本発明の「組付部材」に相当する。   In the above embodiment, the driven blades 110, 210, and 310 correspond to the “first blade” of the present invention. The blade portions 114, 214, and 314 correspond to the “blade edge” of the first blade of the present invention. The driving blades 120, 220, and 320 correspond to the “second blade” of the present invention. The blade portions 124, 224, and 324 correspond to the “blade edge” of the second blade of the present invention. The thread cutting motor 95 corresponds to the “power source” of the present invention. The rear end portion 152 corresponds to an “end portion” of the groove cam of the present invention. The intermediate portion 153 corresponds to a “bent portion” of the groove cam of the present invention. The support shaft 9B corresponds to the “shaft portion” of the present invention. The tension springs 206 and 306 correspond to the “first biasing member” of the present invention. The right end 242 corresponds to “one end” of the link member of the present invention. The left end 241 corresponds to the “other end” of the link member of the present invention. The compression spring 245 corresponds to the “second biasing member” of the present invention. The long hole 257 corresponds to a “hole” in the present invention. The bolt 229 and the nut 205 correspond to the “fixing member” of the present invention. The support shaft 309 corresponds to the “upstream support shaft” of the present invention. The support shaft 303 corresponds to the “downstream support shaft” of the present invention. The right end 383 corresponds to “one end” of the downstream rotating member of the present invention. The left end portion 387 corresponds to the “other end portion” of the downstream rotating member of the present invention. The long hole 382 corresponds to the “adjustment hole” of the present invention. The screw hole 389 and the bolt 308 correspond to the “assembly member” of the present invention.

1 ミシン
7 縫針
9 針板
9A 針穴
9B 支軸
95 糸切用モータ
100,200,300 糸切機構
110,210,310 従動刃
114,214,314 刃部
120,220,320 駆動刃
124,224,324 刃部
130,230,330 伝達部材
150 溝カム
152 後端部
153 中間部
160,260,360 移動機構
165,265,365 コロ部材
201 案内部
205 ナット
206 引張バネ
213 ピン
229 ボルト
240 リンク部材
241 左端部
242 右端部
243 長穴
245 圧縮バネ
250 外周カム
251,252,253 カム面
254 突部
255 傾斜面
257 長穴
301 案内部
303,309 支軸
306 引張バネ
308 ボルト
340 上流回動部材
341 コロ突出部
342 作用突出部
380 下流回動部材
381 第一部材
382 長穴
383 右端部
386 第二部材
387 左端部
389 螺子穴
1 Sewing machine 7 Sewing needle 9 Needle plate 9A Needle hole 9B Support shaft 95 Thread trimmer motor 100, 200, 300 Thread trimmer mechanism 110, 210, 310 Drive blade 114, 214, 314 Blade portion 120, 220, 320 Drive blade 124, 224 , 324 Blade portion 130, 230, 330 Transmission member 150 Groove cam 152 Rear end portion 153 Intermediate portion 160, 260, 360 Moving mechanism 165, 265, 365 Roll member 201 Guide portion 205 Nut 206 Tension spring 213 Pin 229 Bolt 240 Link member 241 Left end portion 242 Right end portion 243 Long hole 245 Compression spring 250 Peripheral cams 251, 252, 253 Cam surface 254 Projection portion 255 Inclined surface 257 Long hole 301 Guide portions 303, 309 Support shaft 306 Tension spring 308 Bolt 340 Upstream rotating member 341 Roller protrusion 342 Action protrusion 380 Downstream rotating member 3 81 First member 382 Long hole 383 Right end 386 Second member 387 Left end 389 Screw hole

Claims (11)

縫針が通る針穴を有する針板の下側に設けた第一刃と、
前記針板の下側に回動可能に設け、前記針穴から離れた位置に刃先を配置する待機位置と、前記針穴の形成位置において刃先が前記第一刃の刃先と交差する切断位置と、前記切断位置に対して前記待機位置とは反対側で、前記針穴から離れた位置に刃先を配置する準備位置との間で移動可能な第二刃と、
動力源の駆動力を前記第二刃に伝達し、前記第二刃を前記待機位置と前記準備位置との間で移動する伝達部材と、
を備え、
前記第二刃は、前記動力源の駆動によって前記伝達部材を介して前記待機位置から前記準備位置に移動した後、前記準備位置から前記切断位置に移動し、
前記第二刃が前記準備位置から前記切断位置に移動する時、上糸と下糸を捕捉し且つ前記第一刃との協働で切断する糸切機構において、
前記第一刃は、刃先が前記針穴の形成位置に配置する接近位置と前記接近位置に対し前記針穴から離間した離間位置との間で移動可能であり、
前記伝達部材と共に前記動力源の駆動力で作動し、前記第一刃を前記接近位置と前記離間位置との間で移動する移動機構を備え、
前記動力源の非駆動時、前記第一刃は前記離間位置に位置し、且つ前記第二刃は前記待機位置に位置し、
前記動力源の駆動時、前記伝達部材によって前記第二刃が前記準備位置から前記切断位置に移動する場合、前記移動機構は、前記第一刃を前記離間位置から前記接近位置に移動することを特徴とする糸切機構。
A first blade provided on the lower side of a needle plate having a needle hole through which a sewing needle passes;
A standby position where the cutting edge is provided at the lower side of the needle plate and arranged at a position away from the needle hole, and a cutting position where the cutting edge intersects the cutting edge of the first blade at the formation position of the needle hole A second blade movable between a preparation position for disposing a cutting edge at a position away from the needle hole on the side opposite to the standby position with respect to the cutting position;
A transmission member that transmits a driving force of a power source to the second blade, and moves the second blade between the standby position and the preparation position;
With
The second blade moves from the standby position to the preparation position via the transmission member by driving the power source, and then moves from the preparation position to the cutting position.
When the second blade moves from the preparation position to the cutting position, a thread cutting mechanism that captures the upper thread and the lower thread and cuts in cooperation with the first blade;
The first blade is movable between an approach position where a blade tip is disposed at a formation position of the needle hole and a separation position spaced from the needle hole with respect to the approach position;
A moving mechanism that operates with the driving force of the power source together with the transmission member and moves the first blade between the approach position and the separation position;
When the power source is not driven, the first blade is located at the separated position, and the second blade is located at the standby position,
When the power source is driven, when the second blade is moved from the preparation position to the cutting position by the transmission member, the moving mechanism moves the first blade from the separated position to the approach position. Characteristic thread trimming mechanism.
前記動力源の駆動時、前記伝達部材は、水平方向と平行な所定方向に往復移動して前記第二刃を前記待機位置と前記準備位置との間で往復移動し、
前記移動機構は、
前記伝達部材と一体に設け、前記所定方向と交差する方向に屈曲する屈曲部分を有し且つ前記所定方向に沿って溝状に延びる溝カムと、
前記第一刃に設け、且つ前記溝カムに嵌合するコロ部材と、
を含み、
前記伝達部材の移動によって前記第二刃が前記待機位置又は前記準備位置に位置する時、前記コロ部材は前記溝カムの端部に位置して前記第一刃を前記離間位置に配置し、
前記第二刃が前記切断位置に位置する時、前記コロ部材は前記溝カムの屈曲部分に位置して前記第一刃を前記接近位置に配置すること
を特徴とする請求項1に記載の糸切機構。
When the power source is driven, the transmission member reciprocates in a predetermined direction parallel to the horizontal direction to reciprocate the second blade between the standby position and the preparation position,
The moving mechanism is
A groove cam provided integrally with the transmission member, having a bent portion bent in a direction crossing the predetermined direction, and extending in a groove shape along the predetermined direction;
A roller member provided on the first blade and fitted into the groove cam;
Including
When the second blade is positioned at the standby position or the preparation position by the movement of the transmission member, the roller member is positioned at the end of the groove cam and the first blade is disposed at the separation position;
2. The yarn according to claim 1, wherein when the second blade is positioned at the cutting position, the roller member is positioned at a bent portion of the groove cam and the first blade is disposed at the approach position. Cutting mechanism.
前記第一刃と前記第二刃は平板状であり、
前記針板に設け、前記第一刃と前記第二刃を同軸で軸方向に重ねて配置し、夫々回動可能に支持する軸部を備え、
前記伝達部材が前記所定方向に往復移動する時、前記伝達部材によって前記軸部を中心に回動する前記第二刃の刃先の回動軌跡は、前記移動機構によって回動する前記第一刃の刃先の回動軌跡と重なる位置を含み、
前記第一刃が前記接近位置に位置し且つ前記第二刃が前記切断位置に位置する時、前記第二刃の刃先は前記第一刃の刃先と交差すること
を特徴とする請求項2に記載の糸切機構。
The first blade and the second blade are flat.
Provided on the needle plate, the first blade and the second blade are coaxially arranged in an axial direction, and each has a shaft portion that rotatably supports,
When the transmission member reciprocates in the predetermined direction, the rotation trajectory of the blade edge of the second blade rotated about the shaft portion by the transmission member is the rotation trajectory of the first blade rotated by the movement mechanism. Including the position that overlaps the rotation trajectory of the cutting edge,
The blade edge of the second blade intersects the blade edge of the first blade when the first blade is located at the approach position and the second blade is located at the cutting position. The thread trimming mechanism described.
前記針板に設け、前記第二刃を回動可能に支持する軸部と、
前記第一刃を、前記接近位置から前記離間位置へ向けて付勢する第一付勢部材と、
を備え、
前記移動機構は、
前記軸部を中心に前記第二刃と共に回動可能に設け、前記軸部の径方向外側を向き周方向に延びるカム面及び前記カム面の前記周方向の一部に前記径方向外向きに突出する突部を有する外周カムと、
前記外周カムの前記カム面に沿って転動可能なコロ部材と、
前記針板に設けた軸体が回動可能に支持し、一端に前記コロ部材を設け、他端に前記第一刃を接続するリンク部材と、
を含み、
前記第一付勢部材は前記リンク部材を介し、前記コロ部材を前記カム面に対して押圧し、
前記動力源の駆動時、前記伝達部材は、水平方向と平行な所定方向に往復移動して前記第二刃を前記待機位置と前記準備位置との間で往復移動し、
前記伝達部材の移動によって前記第二刃が前記待機位置又は前記準備位置に位置する時、前記コロ部材は前記カム面の内前記突部以外の部分に当接して前記第一刃を前記離間位置に配置し、
前記第二刃が前記切断位置に位置する時、前記コロ部材は前記カム面の内前記突部に当接して前記第一刃を前記接近位置に配置すること
を特徴とする請求項1に記載の糸切機構。
A shaft portion provided on the needle plate and rotatably supporting the second blade;
A first biasing member that biases the first blade from the approach position toward the separation position;
With
The moving mechanism is
A cam surface that is pivotable with the second blade about the shaft portion, extends radially outward of the shaft portion in a circumferential direction, and extends radially outward to a portion of the cam surface in the circumferential direction. An outer peripheral cam having a protruding portion that protrudes;
A roller member capable of rolling along the cam surface of the outer peripheral cam;
A shaft member provided on the needle plate is rotatably supported, the roller member is provided at one end, and the link member is connected to the first blade at the other end,
Including
The first urging member presses the roller member against the cam surface via the link member,
When the power source is driven, the transmission member reciprocates in a predetermined direction parallel to the horizontal direction to reciprocate the second blade between the standby position and the preparation position,
When the second blade is positioned at the standby position or the preparation position due to the movement of the transmission member, the roller member abuts against a portion of the cam surface other than the protrusion to place the first blade at the separation position. Placed in
2. The roller member according to claim 1, wherein when the second blade is located at the cutting position, the roller member abuts against the protrusion of the cam surface and the first blade is disposed at the approach position. Thread trimming mechanism.
前記移動機構は、前記コロ部材を前記軸部の軸線方向の一方側に付勢する第二付勢部材を含み、
前記突部は、前記カム面の前記軸線方向の一方側に突出し、且つ前記軸線方向他方側を向く面が前記軸部の周方向の一端側から他端側に向けて前記軸線方向の一方側から他方側に傾斜する傾斜面を形成し、
前記第二刃が前記待機位置から前記準備位置に移動する時、前記コロ部材は前記軸部の周方向の一端側から他端側へ向けて前記傾斜面に沿って前記突部の前記軸線方向他方側を移動して、前記第一刃を前記第一付勢部材の付勢で前記離間位置に配置し、
前記第二刃が前記準備位置から前記切断位置に移動する時、前記コロ部材は前記軸部の周方向の他端側から一端側へ向けて前記突部に沿って移動して、前記リンク部材を介し前記第一刃を前記離間位置から前記接近位置に移動すること
を特徴とする請求項4に記載の糸切機構。
The moving mechanism includes a second urging member that urges the roller member to one side in the axial direction of the shaft portion,
The protrusion protrudes on one side in the axial direction of the cam surface, and a surface facing the other axial direction is one side in the axial direction from one end side to the other end side in the circumferential direction of the shaft portion. Forming an inclined surface inclined from one side to the other,
When the second blade moves from the standby position to the preparation position, the roller member moves in the axial direction of the protrusion along the inclined surface from one end side to the other end side in the circumferential direction of the shaft portion. Moving the other side, placing the first blade in the spaced position by the biasing of the first biasing member,
When the second blade moves from the preparation position to the cutting position, the roller member moves along the protrusion from the other end side in the circumferential direction of the shaft portion toward the one end side, and the link member The thread cutting mechanism according to claim 4, wherein the first blade is moved from the separated position to the approach position via a thread.
前記針板は、前記第一刃の移動を直線状に案内する案内部を備え、
前記リンク部材は、前記他端に、前記第一刃に設けたピンに係合する長穴を有し、
前記リンク部材の回動によって前記長穴の範囲内で前記ピンが移動し、前記第一刃を前記離間位置と前記接近位置との間で直線状に移動する動力に変換することを特徴とする請求項4又は5に記載の糸切機構。
The needle plate includes a guide portion that guides the movement of the first blade in a straight line,
The link member has, at the other end, an elongated hole that engages with a pin provided on the first blade,
The pin moves in the range of the elongated hole by the rotation of the link member, and the first blade is converted into power that moves linearly between the separation position and the approach position. The thread trimming mechanism according to claim 4 or 5.
前記外周カムは、前記軸部の周方向に延びる穴部を有し、
前記第二刃は、前記第二刃と前記外周カムとを一体に固定する固定部材を有し、
前記外周カムは、前記穴部の範囲内で前記第二刃に対する固定位置を変更して前記固定部材で固定可能であることを特徴とする請求項4〜6の何れかに記載の糸切機構。
The outer circumferential cam has a hole extending in the circumferential direction of the shaft portion,
The second blade has a fixing member that integrally fixes the second blade and the outer peripheral cam,
The thread cutting mechanism according to any one of claims 4 to 6, wherein the outer circumferential cam can be fixed by the fixing member by changing a fixing position with respect to the second blade within the range of the hole. .
前記第一刃を、前記接近位置から前記離間位置へ向けて付勢する第一付勢部材と、
前記針板に設け、前記第二刃を回動可能に支持する軸部を備え、
前記移動機構は、
前記第二刃に設け且つ前記軸部の径方向外向きに突出し、前記伝達部材と共に動作するコロ部材と、
前記針板に設けた上流支軸を中心に回動可能な上流回動部材と、
前記針板に設けた下流支軸を中心に回動可能な下流回動部材と、
を含み、
前記上流回動部材は、前記上流支軸の径方向外向きに突出し、前記コロ部材に当接可能なコロ突出部と、前記コロ突出部とは異なる方向の径方向外向きに突出する作用突出部とを有し、
前記下流回動部材は、一端部が前記作用突出部に当接可能であり、他端部が前記第一刃に接続し、
前記第二刃が前記待機位置から前記準備位置に移動する時、前記作用突出部は前記下流回動部材の前記一端部から離れる向きに前記コロ突出部を押圧し、前記第一刃は前記第一付勢部材の付勢で前記離間位置に配置し、
前記第二刃が前記準備位置から前記切断位置に移動する時、前記作用突出部は前記下流回動部材の前記一端部に当接する向きに前記コロ突出部を押圧し、前記第一刃は前記作用突出部と前記下流回動部材を介して前記離間位置から前記接近位置に移動すること
を特徴とする請求項1に記載の糸切機構。
A first biasing member that biases the first blade from the approach position toward the separation position;
Provided on the needle plate, comprising a shaft portion that rotatably supports the second blade,
The moving mechanism is
A roller member provided on the second blade and projecting outward in the radial direction of the shaft, and operating together with the transmission member;
An upstream rotating member that is rotatable about an upstream support shaft provided on the needle plate;
A downstream rotating member that is rotatable about a downstream support shaft provided on the needle plate;
Including
The upstream rotating member protrudes outward in the radial direction of the upstream support shaft, a roller protrusion that can contact the roller member, and an action protrusion that protrudes radially outward in a direction different from the roller protrusion. And
One end of the downstream rotating member can be brought into contact with the action protrusion, and the other end is connected to the first blade,
When the second blade moves from the standby position to the preparation position, the action protrusion presses the roller protrusion in a direction away from the one end of the downstream rotating member, and the first blade Arranged in the separated position by the biasing of one biasing member,
When the second blade moves from the preparation position to the cutting position, the working protrusion presses the roller protrusion in a direction to contact the one end of the downstream rotating member, and the first blade 2. The thread trimming mechanism according to claim 1, wherein the thread trimming mechanism moves from the separated position to the approach position via an action protrusion and the downstream rotating member.
前記針板は、前記第一刃の移動を直線状に案内する案内部を備え、
前記移動機構は、前記第一刃を前記離間位置と前記接近位置との間で直線状に移動することを特徴とする請求項8に記載の糸切機構。
The needle plate includes a guide portion that guides the movement of the first blade in a straight line,
The yarn cutting mechanism according to claim 8, wherein the moving mechanism moves the first blade linearly between the separated position and the approach position.
前記下流回動部材は、
前記下流支軸を中心に回動可能であり、前記一端部と前記下流支軸との間に延びる第一部材と、
前記下流支軸を中心に回動可能であり、前記他端部と前記下流支軸との間に延びる第二部材と、
を備え、
前記第一部材は、前記一端部と前記下流支軸との間に長穴である調整穴を有し、
前記第二部材は、前記調整穴に係合して前記第一部材に組み付ける組付部材を有し、
前記下流回動部材は、前記調整穴の範囲内で前記組付部材の組み付け位置を変更して前記第一部材と前記第二部材を組み付け可能であることを特徴とする請求項8又は9に記載の糸切機構。
The downstream rotating member is
A first member that is pivotable about the downstream support shaft and extends between the one end and the downstream support shaft;
A second member that is pivotable about the downstream support shaft and extends between the other end and the downstream support shaft;
With
The first member has an adjustment hole that is a long hole between the one end and the downstream support shaft;
The second member has an assembly member that engages with the adjustment hole and is assembled to the first member;
10. The downstream rotating member can be assembled with the first member and the second member by changing the assembly position of the assembly member within the range of the adjustment hole. The thread trimming mechanism described.
縫針が通る針穴を有する針板の下側に設けた第一刃と、
前記針板の下側に回動可能に設け、前記針穴から離れた位置に刃先を配置する待機位置と、前記針穴の形成位置において刃先が前記第一刃の刃先と交差する切断位置と、前記切断位置に対して前記待機位置とは反対側で、前記針穴から離れた位置に刃先を配置する準備位置との間で移動可能な第二刃と、
動力源の駆動力を前記第二刃に伝達し、前記第二刃を前記待機位置と前記準備位置との間で移動する伝達部材と、
を備え、
前記第二刃は、前記動力源の駆動によって前記伝達部材を介して前記待機位置から前記準備位置に移動した後、前記準備位置から前記切断位置に移動し、
前記第二刃が前記準備位置から前記切断位置に移動する時、上糸と下糸を捕捉し且つ前記第一刃との協働で切断する糸切機構を備えたミシンにおいて、
前記第一刃は、刃先が前記針穴の形成位置に配置する接近位置と前記接近位置に対し前記針穴から離間した離間位置との間で移動可能であり、
前記糸切機構は、前記伝達部材と共に前記動力源の駆動力で作動し、前記第一刃を前記接近位置と前記離間位置との間で移動する移動機構を備え、
前記動力源の非駆動時、前記第一刃は前記離間位置に位置し、且つ前記第二刃は前記待機位置に位置し、
前記動力源の駆動時、前記伝達部材によって前記第二刃が前記準備位置から前記切断位置に移動する場合、前記移動機構は、前記第一刃を前記離間位置から前記接近位置に移動することを特徴とするミシン。
A first blade provided on the lower side of a needle plate having a needle hole through which a sewing needle passes;
A standby position where the cutting edge is provided at the lower side of the needle plate and arranged at a position away from the needle hole, and a cutting position where the cutting edge intersects the cutting edge of the first blade at the formation position of the needle hole A second blade movable between a preparation position for disposing a cutting edge at a position away from the needle hole on the side opposite to the standby position with respect to the cutting position;
A transmission member that transmits a driving force of a power source to the second blade, and moves the second blade between the standby position and the preparation position;
With
The second blade moves from the standby position to the preparation position via the transmission member by driving the power source, and then moves from the preparation position to the cutting position.
When the second blade moves from the preparation position to the cutting position, the sewing machine includes a thread cutting mechanism that captures an upper thread and a lower thread and cuts the upper blade and the first blade in cooperation with each other.
The first blade is movable between an approach position where a blade tip is disposed at a formation position of the needle hole and a separation position spaced from the needle hole with respect to the approach position;
The yarn cutting mechanism includes a moving mechanism that operates with the driving force of the power source together with the transmission member and moves the first blade between the approach position and the separation position,
When the power source is not driven, the first blade is located at the separated position, and the second blade is located at the standby position,
When the power source is driven, when the second blade is moved from the preparation position to the cutting position by the transmission member, the moving mechanism moves the first blade from the separated position to the approach position. Characteristic sewing machine.
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CN109881389A (en) * 2019-03-18 2019-06-14 杰克缝纫机股份有限公司 For cutting the mechanism of sewing machine suture

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US20210009373A1 (en) * 2017-11-30 2021-01-14 Zuiko Corporation Sheet supply device and sheet supply method

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JP2009195382A (en) * 2008-02-20 2009-09-03 Brother Ind Ltd Thread cutter of sewing machine
JP2009195464A (en) * 2008-02-21 2009-09-03 Juki Corp Thread cutter of sewing machine
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CN109881389A (en) * 2019-03-18 2019-06-14 杰克缝纫机股份有限公司 For cutting the mechanism of sewing machine suture

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