JP2017099657A - sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sewing machine capable of making cut ends of a needle thread and a bobbin thread short remaining on a sewing object after cutting.SOLUTION: At the start of sewing, a thread grip member 160 arranges a thread hole 165 below a needle hole 90 and passes a needle thread. The thread grip member 160 rotates counter-clockwise in a bottom view, and holds the needle thread between itself and a thread pressing member 180. The thread grip member 160 moves to a release position and loosens the holding of the needle thread. A sewing machine sews the needle thread in seams and continues sewing. One end part 161 of the thread grip member 160 is connected integrally to a protection member 175 via an arm part 170. At the release position, the protection member 175 is located at a protection position below a blade part 114 of a stationary blade 110. On a cross section including a center position of the needle hole 90, the protection member 175 crosses a virtual straight line connecting an edge part of the needle hole 90 and the blade part 114, it is prevented that the needle thread and the bobbin thread coming into contact with the blade part 114. Therefore, the stationary blade 110 can arrange the blade part 114 closer to the needle hole 90 than a conventional one.SELECTED DRAWING: Figure 11

Description

本発明は、縫製終了後に糸を切断する糸切機構を備えたミシンに関する。   The present invention relates to a sewing machine provided with a thread cutting mechanism 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。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、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. When the fixed blade is fixed to the needle plate in a state where the blade edge is closer to the needle hole than the thread cutting mechanism, the lower thread may touch the fixed blade at the time of sewing and may break the thread. Therefore, it has been difficult to shorten the upper thread and lower thread ends of 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ミシンを提供することである。   An object of the present invention is to provide a sewing machine that can shorten the upper thread and the lower thread that are left 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、刃先を前記針穴に向けて配置する固定刃と、前記針板の下側に水平に回動可能に設け、刃先が前記固定刃の刃先と交差する経路を往復移動可能な可動刃と、前記可動刃に駆動力を付与し、前記可動刃を往復移動する動力源と、を備え、前記動力源による前記可動刃の駆動時、上糸と下糸を前記可動刃で捕捉し、且つ前記可動刃の刃先と前記固定刃の刃先とを交差して前記上糸と下糸を切断するミシンにおいて、前記可動刃の非駆動時に前記固定刃の下側の防護位置に位置し、前記可動刃の駆動時に前記固定刃の刃先に対し前記針穴から離間する待避位置に位置する防護部材を備え、前記防護部材が前記防護位置に位置する時、前記固定刃と前記防護部材と前記針穴の中心位置とを含む断面において、前記防護部材の前記針穴側の端部は、前記針穴の前記防護部材が位置する側の縁部と前記固定刃の刃先とを結ぶ仮想直線に対して接触又は交差することを特徴とするミシンが提供される。   According to the first aspect of the present invention, the fixed blade is provided on the lower side of the needle plate having the needle hole through which the sewing needle passes, and the blade tip is disposed toward the needle hole, and the lower side of the needle plate is rotated horizontally. A movable blade capable of reciprocally moving along a path where the blade edge intersects the blade edge of the fixed blade, and a power source that applies a driving force to the movable blade and reciprocates the movable blade. A sewing machine that captures an upper thread and a lower thread with the movable blade when the movable blade is driven by a source, and cuts the upper thread and the lower thread by crossing the blade edge of the movable blade and the blade edge of the fixed blade; A protective member positioned at a protective position below the fixed blade when the movable blade is not driven and positioned at a retracted position away from the needle hole with respect to the blade edge of the fixed blade when the movable blade is driven, When the protective member is located at the protective position, the fixed blade, the protective member, and the needle hole The end of the protective member on the side of the needle hole is in contact with an imaginary straight line connecting the edge of the needle hole on the side where the protective member is located and the cutting edge of the fixed blade. A sewing machine characterized by crossing is provided.

防護部材は、可動刃の非駆動時に防護部材と針板との間に固定刃の刃先を配置し、固定刃の刃先が上糸と下糸の経路上に位置することを防ぐ。即ち防護部材は、縫製中に上糸と下糸が固定刃の刃先に触れることを防止し、糸切れの可能性を低減できる。防護部材が固定刃の刃先による上糸と下糸の糸切れを防止するので、固定刃は、刃先を従来よりも針穴に近づけて配置することができる。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、切断後に縫製対象物に残る上糸と下糸の切れ端を短くすることができる。   The protection member arranges the blade edge of the fixed blade between the protection member and the needle plate when the movable blade is not driven, and prevents the blade edge of the fixed blade from being positioned on the path of the upper thread and the lower thread. That is, the protective member prevents the upper thread and the lower thread from touching the cutting edge of the fixed blade during sewing, and can reduce the possibility of thread breakage. Since the protective member prevents thread breakage of the upper thread and the lower thread by the blade edge of the fixed blade, the fixed blade can be disposed with the blade edge closer to the needle hole than in the past. Therefore, the sewing machine can shorten the upper end of the upper thread and the lower thread remaining on the sewing target after cutting, as compared with the case where the upper thread and the lower thread are cut away from the needle hole.

第一態様では、前記固定刃の刃先は前記針穴の中心線に直交する延伸方向に延び、前記防護部材は、前記針穴側の端部が前記延伸方向に沿って延び、前記針穴の直径以上の長さを有してもよい。   In the first aspect, the cutting edge of the fixed blade extends in an extending direction perpendicular to the center line of the needle hole, and the protective member has an end portion on the needle hole side extending along the extending direction, You may have a length more than a diameter.

縫製時、上糸と下糸は針穴を通り、針板の下方に延びる。防護部材の延びる長さは、針穴の直径以上である。上糸と下糸が針穴の範囲内で動いても、防護部材は、上糸と下糸が固定刃の刃先に触れることを確実に防止することができる。   When sewing, the upper thread and lower thread pass through the needle hole and extend below the needle plate. The extending length of the protective member is not less than the diameter of the needle hole. Even if the upper thread and the lower thread move within the range of the needle hole, the protective member can reliably prevent the upper thread and the lower thread from touching the cutting edge of the fixed blade.

第一態様は、前記針板の下側に水平に回動可能に設け、前記上糸が通る糸穴を第一端部に有し、縫製開始時に前記糸穴を前記針穴の下方に位置する準備位置と、前記準備位置に対し前記糸穴を前記針穴から離れた位置に位置する離間位置との間で移動する糸掴み部材と、前記針板の下側に水平に回動可能に設け、前記糸掴み部材の前記第一端部との間に前記上糸を挟んで保持可能な第二端部を有し、前記糸掴み部材に従動し、前記第二端部が前記糸穴と上下方向に重なる位置に移動して前記上糸を挟む糸押え部材と、を備え、前記糸掴み部材と前記防護部材は、前記糸掴み部材が前記準備位置から前記離間位置に向けて移動する方向と反対方向に前記第一端部から延びる腕部を介して一体に設け、前記糸掴み部材は、前記準備位置と前記離間位置の間の捕獲位置に移動した時、前記糸穴が前記第二端部と上下方向に重なる位置に移動し、且つ前記捕獲位置と前記離間位置の間の解放位置に移動した時、前記糸穴が前記第二端部から離間する位置に移動して前記上糸の保持を緩め、前記防護部材は、前記糸掴み部材が前記解放位置に移動した時、前記防護位置に位置してもよい。   The first aspect is provided at the lower end of the needle plate so as to be horizontally rotatable, and has a thread hole through which the upper thread passes at the first end, and the thread hole is positioned below the needle hole at the start of sewing. A thread gripping member that moves between a preparation position to perform and a separation position in which the thread hole is located away from the needle hole with respect to the preparation position, and can be horizontally rotated under the needle plate A second end portion that can be held by holding the upper thread between the first end portion of the thread gripping member and is driven by the thread gripping member, and the second end portion is the thread hole. And a thread holding member that sandwiches the upper thread by moving to a position that overlaps with the upper and lower direction, and the thread gripping member and the protection member move the thread gripping member from the preparation position toward the separated position. The thread gripping member is provided integrally with an arm portion extending from the first end portion in a direction opposite to the direction. When the yarn hole moves to a position overlapping the second end portion in the vertical direction and moves to a release position between the capture position and the separation position, The hole may move to a position away from the second end to loosen the upper thread, and the protection member may be positioned at the protection position when the thread gripping member is moved to the release position. .

糸掴み部材と糸押え部材は、縫製開始時に上糸の端部を挟み、保持することができる。防護部材は、糸掴み部材と一体に設ける。防護部材は、糸掴み部材と糸押え部材が上糸の端部を保持した後、緩めた時に、防護位置に位置する。故にミシンは、糸掴み部材を駆動するだけで、上糸の保持を行うと共に、防護部材の移動を行うことができるので、別途、防護部材の移動機構を設けなくてもよい。   The thread gripping member and the thread presser member can sandwich and hold the end of the upper thread at the start of sewing. The protective member is provided integrally with the thread gripping member. The protection member is positioned at the protection position when the thread gripping member and the thread pressing member are loosened after holding the end portion of the upper thread. Therefore, since the sewing machine can hold the upper thread and move the protection member only by driving the thread gripping member, it is not necessary to provide a separate movement mechanism for the protection member.

第一態様では、前記糸掴み部材は、前記固定刃よりも下方に位置し、前記腕部は上下方向に屈曲し、前記防護部材を前記第一端部よりも上方に配置する第一屈曲部を有してもよい。   In the first aspect, the thread gripping member is positioned below the fixed blade, the arm portion is bent in the vertical direction, and the first bent portion is disposed above the first end portion. You may have.

第一屈曲部により腕部が上下方向に屈曲するので、防護部材は防護位置で固定刃の刃先により近づけた状態に配置できる。故に、防護部材は、固定刃の刃先との間隔を短くし、縫製中に上糸と下糸が固定刃の刃先に触れることをより確実に防ぐことができ、糸切れの可能性をより低減できる。   Since the arm portion is bent in the vertical direction by the first bent portion, the protective member can be arranged in a state closer to the cutting edge of the fixed blade at the protective position. Therefore, the protective member shortens the distance between the fixed blade and the blade, and more reliably prevents the upper thread and lower thread from touching the fixed blade during sewing, further reducing the possibility of thread breakage. it can.

第一態様では、前記糸掴み部材が前記捕獲位置に位置する時、前記防護部材と前記第一端部、及び前記腕部と前記糸掴み部材の回動中心は夫々前記針穴の形成位置を間にして反対側に位置し、前記腕部は前記糸掴み部材の回動中心と反対側に水平方向に屈曲する第二屈曲部を有してもよい。   In the first aspect, when the thread gripping member is located at the capture position, the protective member and the first end part, and the arm part and the rotation center of the thread gripping member are located at the position where the needle hole is formed. The arm portion may have a second bent portion that is bent in the horizontal direction on the opposite side to the rotation center of the thread gripping member.

糸掴み部材が捕獲位置に位置する時、腕部は針穴の形成位置とは上下方向に重ならない。故に腕部は、針穴を通る上糸と下糸に干渉しにくい。腕部が上糸と下糸に負荷を与えることがないので、ミシンは円滑に縫製できる。   When the thread gripping member is located at the capture position, the arm portion does not overlap with the needle hole formation position in the vertical direction. Therefore, the arm portion hardly interferes with the upper thread and the lower thread that pass through the needle hole. Since the arm does not apply a load to the upper thread and the lower thread, the sewing machine can be sewn smoothly.

第一態様では、前記動力源は、前記糸掴み部材に駆動力を付与し、前記糸掴み部材を前記準備位置と前記離間位置との間で移動してもよい。   In the first aspect, the power source may apply a driving force to the thread gripping member and move the thread gripping member between the preparation position and the separation position.

可動刃に駆動力を付与する動力源は、糸掴み部材にも駆動力を付与する。故にミシンは、糸掴み部材を駆動する為の動力源を別途設ける必要がない。   A power source that applies a driving force to the movable blade also applies a driving force to the thread gripping member. Therefore, the sewing machine does not require a separate power source for driving the thread gripping member.

第一態様では、前記糸掴み部材は、前記糸掴み部材の回動中心と前記第一端部との間に、上下方向に突出する突出部を備え、前記糸押え部材は、前記糸押え部材の回動中心と前記第二端部との間に、前記糸掴み部材が前記準備位置から前記解放位置に移動する時に前記突出部が当接する側面である当接部を備え、前記突出部は、前記糸掴み部材が前記準備位置から前記解放位置に移動する時に前記当接部に当接して前記糸押え部材を前記糸掴み部材と同じ方向に回動させ、前記当接部は、前記糸掴み部材が前記準備位置から前記解放位置までの間に位置する時に前記突出部が当接する第一当接部と、前記糸掴み部材が前記解放位置よりも前記離間位置側に位置する時に前記突出部が当接し、前記第一当接部よりも前記突出部と反対側に凹む第二当接部と、を含んでもよい。   In the first aspect, the thread gripping member includes a projecting portion that protrudes in a vertical direction between a rotation center of the thread gripping member and the first end portion, and the thread presser member includes the thread presser member. A contact portion that is a side surface against which the protrusion comes into contact when the thread gripping member moves from the preparation position to the release position. When the thread gripping member moves from the preparation position to the release position, the thread gripping member is brought into contact with the contact portion to rotate the thread presser member in the same direction as the thread gripping member. A first abutting portion with which the projecting portion abuts when the gripping member is positioned between the preparation position and the release position; and the projection when the thread gripping member is positioned on the side of the separation position with respect to the release position. The first part is in contact with the first contact part and is recessed on the opposite side of the projecting part. A contact portion may include a.

可動刃の駆動時、防護部材を可動刃の経路から遠ざける為、糸掴み部材が回動する範囲は従来の防護部材が無い構成よりも大きい。糸押え部材は、糸掴み部材に従動して回動する。糸押え部材は、第一当接部よりも突出部と反対側に凹む第二当接部を備えるので、糸掴み部材が解放位置よりも離間位置側に位置する時の糸押え部材の回動量を抑制できる。故にミシンは、針板の下側に糸押え部材が回動する為の領域を大きく確保する必要がない。   Since the protection member is moved away from the path of the movable blade when the movable blade is driven, the range in which the thread gripping member rotates is larger than the configuration without the conventional protection member. The thread presser member rotates following the thread gripping member. Since the thread presser member includes the second contact part that is recessed to the opposite side of the projecting part from the first contact part, the amount of rotation of the thread presser member when the thread gripping member is located on the separated position side from the release position. Can be suppressed. Therefore, the sewing machine does not need to ensure a large area for the thread presser member to rotate below the needle plate.

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. 糸掴み部材１６０が離間位置にある時の糸掴み機構１５０の底面図である。FIG. 5 is a bottom view of the thread gripping mechanism 150 when the thread gripping member 160 is in a separated position. 糸掴み部材１６０の底面図である。5 is a bottom view of the thread gripping member 160. FIG. 図５の矢印Ａ方向に見た糸掴み部材１６０の側面図である。FIG. 6 is a side view of the thread gripping member 160 viewed in the direction of arrow A in FIG. 5. 糸押え部材１８０の底面図である。6 is a bottom view of the thread presser member 180. FIG. 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. 糸掴み部材１６０が準備位置にある時の糸掴み機構１５０の底面図である。FIG. 6 is a bottom view of the thread gripping mechanism 150 when the thread gripping member 160 is in a preparation position. 糸掴み部材１６０が捕獲位置にある時の糸掴み機構１５０の底面図である。FIG. 5 is a bottom view of the thread gripping mechanism 150 when the thread gripping member 160 is in a capture position. 糸掴み部材１６０が解放位置にある時の糸掴み機構１５０の底面図である。It is a bottom view of the thread gripping mechanism 150 when the thread gripping member 160 is in the release position. 図１１のＢ−Ｂ線で矢印方向に側面視した針穴９０の中心位置Ｃを含む針板９と固定刃１１０と防護部材１７５の断面図である。12 is a cross-sectional view of the needle plate 9, the fixed blade 110, and the protection member 175 including the center position C of the needle hole 90 viewed from the side in the arrow direction along the line BB in FIG. 防護部材２７５の端部が仮想直線Ｖ１に接する変形例の針板９と固定刃１１０と防護部材２７５の断面図である。It is sectional drawing of the needle plate 9, the fixed blade 110, and the protection member 275 of the modification which the edge part of the protection member 275 touches the virtual straight line V1. 防護部材３７５の変形例を示す底面図である。It is a bottom view showing a modification of the protection member 375.

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９０（図８参照）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 90 (see FIG. 8) 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２１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２１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 21 on the upper portion of the back wall. The arm portion 4 extends forward substantially parallel to the bed portion 2 from the upper end of the pedestal portion 3 and includes a main shaft that is driven by a sewing machine motor 21 therein. 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１５０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１５０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２５を固定する。糸切用モータ２５はパルスモータであり、糸切機構１００と糸掴み機構１５０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 150 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 150 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 the thread cutting motor 25 to the back side of the bed portion 2 via a bracket 80. The thread trimming motor 25 is a pulse motor and is a drive source for the thread trimming mechanism 100 and the thread gripping mechanism 150.

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、可動刃１２０が非駆動時に待機する位置（図４参照）における向きで説明する。図４に示すように、糸切機構１００は固定刃１１０と可動刃１２０を備える。固定刃１１０は底面視略Ｌ字状の板材である。固定刃１１０の一端部１１１は屈曲部分から右後方に延びる部分の端部であり、他端部１１２は屈曲部分から左後方に延びる部分の端部である。固定刃１１０の他端部１１２は、針板９の下面に二つの螺子１１３で固定する。固定刃１１０の一端部１１１は、針穴９０の左前方に位置する。一端部１１１は刃部１１４を備える。刃部１１４は、刃渡りの方向が水平方向且つ針穴９０の中心線に直交する方向である延伸方向に延び、固定刃１１０の一端において下方に曲げ形成する。   In the following description, the direction of each member constituting the thread trimming mechanism 100 will be described in the direction at the position where the movable blade 120 stands by when not driven (see FIG. 4). As shown in FIG. 4, the thread cutting mechanism 100 includes a fixed blade 110 and a movable blade 120. The fixed blade 110 is a plate material that is substantially L-shaped when viewed from the bottom. One end 111 of the fixed blade 110 is an end of a portion extending rightward and rearward from the bent portion, and the other end 112 is an end of a portion extending leftward and rearward from the bent portion. The other end 112 of the fixed blade 110 is fixed to the lower surface of the needle plate 9 with two screws 113. One end 111 of the fixed blade 110 is located on the left front side of the needle hole 90. The one end portion 111 includes a blade portion 114. The blade portion 114 extends in the extending direction, which is the horizontal direction and the direction perpendicular to the center line of the needle hole 90, and is bent downward at one end of the fixed blade 110.

可動刃１２０の形状は、左右方向に延びる板状である。可動刃１２０は中間部分に、支軸９１に係合する軸穴（図示略）を有する。支軸９１は、可動刃１２０を水平に往復回動可能に支持する。可動刃１２０は、固定刃１１０の下側に配置する。可動刃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る部分の端部であり、他端部１２２は軸穴の右方に延びる部分の端部である。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は可動刃１２０を上下方向に貫通する貫通穴の端部である。可動刃１２０が回動する時、刃部１２４は支軸９１を中心とする円弧状の軌跡を移動し、針穴９０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、第三リンク５３の一端部５３Ａに回動可能に連結する。糸切機構１００の動作時、第三リンク５３は前後方向に往復移動し、可動刃１２０を往復回動する。   The shape of the movable blade 120 is a plate shape extending in the left-right direction. The movable blade 120 has a shaft hole (not shown) that engages with the support shaft 91 at an intermediate portion. The support shaft 91 supports the movable blade 120 so as to be able to reciprocate horizontally. The movable blade 120 is disposed below the fixed blade 110. The movable blade 120 includes one end 121 and the other end 122. One end 121 is an end of a portion extending to the left of the shaft hole, and the other end 122 is an end of a portion extending 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 movable blade 120 in the vertical direction. When the movable blade 120 rotates, the blade portion 124 moves along an arcuate locus centering on the support shaft 91 and passes through the formation position of the needle hole 90. 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 one end 53A of the third link 53. During the operation of the thread cutting mechanism 100, the third link 53 reciprocates in the front-rear direction, and the movable blade 120 reciprocates.

以下の説明で、糸掴み機構１５０を構成する各部材の方向の説明は、糸掴み部材１６０が離間位置（図４参照）に位置する時の向きで説明する。糸切用モータ２５の出力軸は、縫製開始前の状態において、糸掴み部材１６０を離間位置に配置し、且つ可動刃１２０の刃部１２４を針穴９０の前側の位置に配置する。図４〜図７に示すように、糸掴み機構１５０は、糸掴み部材１６０と糸押え部材１８０を備える。糸掴み部材１６０の形状は、中央部１６３において略直角に屈曲する略Ｌ字状の板状である。中央部１６３は、穴部１６４を有する。支軸９２は針板９の下面に固定し、穴部１６４に係合して糸掴み部材１６０を回動可能に支持する。中央部１６３から前方に延びる部分は、一端部１６１において左前方に屈曲する。一端部１６１は、糸穴１６５とピン１６６を備える。糸穴１６５は糸掴み部材１６０を上下方向に貫通する。糸穴１６５は、糸掴み時に上糸を通す。ピン１６６の形状は円柱状である。ピン１６６は糸穴１６５の後側に設け、上方に突出する。ピン１６６は、糸押え部材１８０の当接部１９０に当接する。   In the following description, the direction of each member constituting the thread gripping mechanism 150 will be described in the direction when the thread gripping member 160 is located at the separation position (see FIG. 4). The output shaft of the thread trimming motor 25 has the thread gripping member 160 disposed at a separated position and the blade portion 124 of the movable blade 120 disposed at the front side of the needle hole 90 in a state before starting sewing. As shown in FIGS. 4 to 7, the thread gripping mechanism 150 includes a thread gripping member 160 and a thread presser member 180. The shape of the thread gripping member 160 is a substantially L-shaped plate that bends at a substantially right angle at the central portion 163. The central part 163 has a hole 164. The support shaft 92 is fixed to the lower surface of the needle plate 9 and engages with the hole 164 to support the thread gripping member 160 in a rotatable manner. A portion extending forward from the central portion 163 is bent leftward and forward at one end portion 161. The one end 161 includes a thread hole 165 and a pin 166. The thread hole 165 penetrates the thread gripping member 160 in the vertical direction. The thread hole 165 allows the upper thread to pass when gripping the thread. The pin 166 has a cylindrical shape. The pin 166 is provided on the rear side of the thread hole 165 and protrudes upward. The pin 166 contacts the contact portion 190 of the thread presser member 180.

防護部材１７５は、腕部１７０を介して糸掴み部材１６０と一体に設ける。防護部材１７５は、縫製中に上糸と下糸が固定刃１１０の刃部１１４に触れることを防止する。腕部１７０は、一端部１６１の前端右角部分から右前方に延び、防護部材１７５に接続する。腕部１７０は第一屈曲部１７１と第二屈曲部１７２を有する。第一屈曲部１７１は、腕部１７０を上方へ向けて段状に屈曲し、防護部材１７５を一端部１６１よりも上方に配置する。第二屈曲部１７２は、第一屈曲部１７１よりも右側で右後方に屈曲する。防護部材１７５は、左後方から右前方へ向けて直線状に延びる防護面１７６を有する。防護面１７６は、右後側を向く面と、右後方且つ下方を向く面を含む。防護面１７６が延びる長さＬは、針穴９０の直径Ｄ以上であり、且つ固定刃１１０の刃部１１４の刃渡り長さより短い。尚、針穴９０の直径Ｄは、針板９を上下に貫通する部分の内径である。糸掴み部材１６０が解放位置（図１１参照）に位置する時、防護面１７６が延びる方向は、固定刃１１０の刃部１１４の延伸方向に沿う。   The protection member 175 is provided integrally with the thread gripping member 160 via the arm portion 170. The protection member 175 prevents the upper thread and the lower thread from touching the blade portion 114 of the fixed blade 110 during sewing. The arm portion 170 extends rightward from the right corner portion of the front end of the one end portion 161 and is connected to the protection member 175. The arm part 170 has a first bent part 171 and a second bent part 172. The first bent portion 171 is bent stepwise with the arm portion 170 facing upward, and the protective member 175 is disposed above the one end portion 161. The second bent portion 172 bends rightward and rearward on the right side of the first bent portion 171. The protection member 175 has a protection surface 176 that extends linearly from the left rear to the right front. The protective surface 176 includes a surface facing the right rear side and a surface facing the rear right side and the lower side. The length L that the protective surface 176 extends is equal to or larger than the diameter D of the needle hole 90 and is shorter than the blade span length of the blade portion 114 of the fixed blade 110. The diameter D of the needle hole 90 is the inner diameter of the portion that penetrates the needle plate 9 vertically. When the thread gripping member 160 is located at the release position (see FIG. 11), the direction in which the protection surface 176 extends is along the extending direction of the blade portion 114 of the fixed blade 110.

糸掴み部材１６０の他端部１６２は、中央部１６３から左方に延びる部分の端部である。他端部１６２は、穴部１６７を有する。穴部１６７は、第三リンク６３の一端部６３Ａのピン９３と係合し、他端部１６２を第三リンク６３に連結する。第三リンク６３は糸掴みリンク機構６０（図８参照）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、糸掴み部材１６０は支軸９２を中心に水平に往復回動する。   The other end portion 162 of the thread gripping member 160 is an end portion of a portion extending leftward from the central portion 163. The other end 162 has a hole 167. The hole portion 167 engages with the pin 93 of the one end portion 63 </ b> A of the third link 63 and connects the other end portion 162 to the third link 63. The third link 63 extends forward from the thread clamp link mechanism 60 (see FIG. 8). When the third link 63 moves in the front-rear direction, the thread gripping member 160 reciprocates horizontally around the support shaft 92.

糸押え部材１８０の形状は、中央部１８３が略直角に屈曲する略Ｌ字状の板状である。糸押え部材１８０の一端部１８１は中央部１８３から前方に延びる部分の端部であり、他端部１８２は中央部１８３から右方に延びる部分の端部である。中央部１８３は、穴部１８４を有する。支軸９４は針板９の下面に固定し、穴部１８４に係合して糸押え部材１８０を回動可能に支持する。一端部１８１は右方に延び、且つ下方へ向けて段状に屈曲し、把持部１８６を形成する。糸押え部材１８０は、糸掴み部材１６０の上側に配置する。糸押え部材１８０の一端部１８１と糸掴み部材１６０の一端部１６１は、少なくとも一部を上下方向に重ねて配置する。把持部１８６は、上下方向において一端部１８１よりも糸掴み部材１６０の一端部１６１に近接する。   The shape of the thread presser member 180 is a substantially L-shaped plate shape in which the central portion 183 is bent at a substantially right angle. One end 181 of the thread presser member 180 is an end of a portion extending forward from the central portion 183, and the other end 182 is an end of a portion extending rightward from the central portion 183. The central part 183 has a hole 184. The support shaft 94 is fixed to the lower surface of the needle plate 9 and engages with the hole 184 to support the thread presser member 180 in a rotatable manner. The one end 181 extends to the right and bends downward in a stepped manner to form a grip 186. The thread presser member 180 is disposed above the thread gripping member 160. At least a part of the one end 181 of the thread presser member 180 and the one end 161 of the thread gripping member 160 are arranged in the vertical direction. The grip part 186 is closer to the one end part 161 of the thread gripping member 160 than the one end part 181 in the vertical direction.

他端部１８２は、穴部１８５を有する。引張バネ４５の一端は、穴部１８５に係合する。引張バネ４５の他端は、支軸９２の右後方に設けた掛留部９５に掛け留める。糸押え部材１８０の他端部１８２は、掛留部９５の前方に位置する。引張バネ４５は他端部１８２を後方に付勢し、支軸９４を中心に糸押え部材１８０を底面視時計回りに回動する。   The other end 182 has a hole 185. One end of the tension spring 45 engages with the hole 185. The other end of the tension spring 45 is hooked on a hanging portion 95 provided on the right rear side of the support shaft 92. The other end portion 182 of the thread presser member 180 is located in front of the hanging portion 95. The tension spring 45 urges the other end 182 rearward, and rotates the thread presser member 180 about the support shaft 94 in the clockwise direction when viewed from the bottom.

糸押え部材１８０は当接部１９０を有する。当接部１９０は、中央部１８３と一端部１８１の間で延びる部分の側部である。当接部１９０は、第一当接部１９１と第二当接部１９２を有する。第一当接部１９１は、一端部１８１側の部分である。糸掴み部材１６０が準備位置（図９参照）、捕獲位置（図１０参照）、解放位置（図１１参照）に位置する時、ピン１６６は、第一当接部１９１に右側から当接する。   The thread presser member 180 has a contact portion 190. The contact portion 190 is a side portion of a portion extending between the central portion 183 and the one end portion 181. The contact part 190 includes a first contact part 191 and a second contact part 192. The first contact portion 191 is a portion on the one end portion 181 side. When the thread gripping member 160 is located at the preparation position (see FIG. 9), the capture position (see FIG. 10), or the release position (see FIG. 11), the pin 166 contacts the first contact portion 191 from the right side.

第二当接部１９２は、第一当接部１９１よりも中央部１８３側の部分である。第二当接部１９２は、第一当接部１９１よりも左側に凹む。糸掴み部材１６０が離間位置（図４参照）に位置する時、ピン１６６は、第二当接部１９２に右側から当接する。糸押え部材１８０は、ピン１６６が第二当接部１９２に当接する時、第一当接部１９１を仮に中央部１８３側へ延長した位置に当接する場合よりも、底面視反時計回りに回動する大きさを抑制できる。   The second contact part 192 is a part closer to the center part 183 than the first contact part 191. The second contact portion 192 is recessed to the left side of the first contact portion 191. When the thread gripping member 160 is positioned at the separated position (see FIG. 4), the pin 166 contacts the second contact portion 192 from the right side. When the pin 166 contacts the second contact portion 192, the thread presser member 180 rotates counterclockwise as viewed from the bottom as compared with the case where the first contact portion 191 contacts the position extended to the center portion 183 side. The moving size can be suppressed.

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１５０を駆動する。図８に示すように、駆動機構１５は糸切用モータ２５、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２５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２５はブラケット８０上面に固定し、出力軸（図示略）をブラケット８０内に配置する。カム板７０はブラケット８０内に配置し、糸切用モータ２５の出力軸に固定する。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。カム板７０は、糸切用モータ２５の出力軸の回転角度において、溝カムが糸切リンク機構５０を駆動する角度範囲と外周カムが糸掴みリンク機構６０を駆動する角度範囲が異なるように形成する。   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 150. As shown in FIG. 8, the drive mechanism 15 includes a thread trimming motor 25, a cam plate 70, a thread trimming link mechanism 50, and a thread gripping link mechanism 60. The thread trimming motor 25 is fixed to the lower back portion (see FIG. 1) of the bed portion 2 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 cutting motor 25 is fixed to the upper surface of the bracket 80, and an output shaft (not shown) is disposed in the bracket 80. The cam plate 70 is disposed in the bracket 80 and fixed to the output shaft of the thread cutting motor 25. 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. The cam plate 70 is formed so that the angular range in which the groove cam drives the thread trimming link mechanism 50 and the angular range in which the outer peripheral cam drives the thread gripping link mechanism 60 differ at the rotation angle of the output shaft of the thread trimming motor 25. To do.

糸切リンク機構５０は、糸切用モータ２５側から糸切機構１００側に向かって順に、第一リンク５１、第二リンク５２、第三リンク５３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, a second link 52, and a third link 53 in order from the thread trimming motor 25 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で第三リンク５３の他端部５３Ｂに固定する。第三リンク５３は、他端部５３Ｂから糸切機構１００へ向けて略直線状に前方に延びる。第三リンク５３の一端部５３Ａは、ピン１１９を介して可動刃１２０と回動可能に連結する。糸切用モータ２５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の可動刃１２０を駆動し、上糸と下糸を切断する。   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 portion 52 </ b> A of the second link 52 is fixed to the other end portion 53 </ b> B of the third link 53 with two screws 57. The third link 53 extends forward substantially linearly from the other end 53B toward the thread trimming mechanism 100. One end 53 </ b> A of the third link 53 is rotatably connected to the movable blade 120 via a pin 119. When the thread trimming motor 25 is driven, the thread trimming link mechanism 50 drives the movable blade 120 of the thread trimming mechanism 100 according to the rotation direction and angle of the cam plate 70 to cut the upper thread and the lower thread.

糸掴みリンク機構６０は、糸切用モータ２５側から糸掴み機構１５０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する。ブラケット８０は、第一リンクを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１５０へ向けて前方に延びる。第三リンク６３の一端部６３Ａは、ピン９３を介して糸掴み部材１６０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 25 side toward the thread gripping mechanism 150 side. The first link of the thread grasping link mechanism 60 is formed in a substantially straight line shape in plan view. The bracket 80 supports the first link so as to be 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 150. One end 63A of the third link 63 is rotatably connected to the thread gripping member 160 via a pin 93 (see FIG. 4).

糸切機構１００と糸掴み機構１５０の動作を説明する。縫製開始時、糸切用モータ２５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１５０の糸掴み部材１６０を回動する。図９に示すように、第三リンク６３が前方へ移動すると、糸掴み部材１６０は底面視時計回りに回動し、準備位置に移動する（図９参照）。準備位置では、一端部１６１の糸穴１６５は、針穴９０の下方に位置する。ピン１６６は右方に移動し、糸押え部材１８０の当接部１９０から離れる。糸押え部材１８０は、引張バネ４５の付勢によって底面視時計回りに回動する。糸押え部材１８０は、他端部１８２が支軸９２に当接する位置で回動を停止する。   The operation of the thread trimming mechanism 100 and the thread gripping mechanism 150 will be described. At the start of sewing, the thread trimming motor 25 drives the output shaft to reciprocate the cam plate 70 in a predetermined direction. The thread gripping link mechanism 60 rotates the thread gripping member 160 of the thread gripping mechanism 150 according to the rotation direction and angle of the cam plate 70. As shown in FIG. 9, when the third link 63 moves forward, the thread gripping member 160 rotates clockwise as viewed from the bottom and moves to the preparation position (see FIG. 9). In the preparation position, the thread hole 165 of the one end portion 161 is located below the needle hole 90. The pin 166 moves to the right and moves away from the contact portion 190 of the thread presser member 180. The thread presser member 180 is rotated clockwise as viewed from the bottom by the biasing force of the tension spring 45. The thread presser member 180 stops rotating at a position where the other end 182 contacts the support shaft 92.

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９０から糸掴み部材１６０の糸穴１６５を通過して下方に延びる。一針目の縫針７が糸穴１６５から離れた後、糸切用モータ２５はカム板７０を回転し、第三リンク６３はカム板７０の回転方向と角度に応じて後方へ移動する。図１０に示すように、第三リンク６３が後方へ移動すると、糸掴み部材１６０は底面視反時計回りに回動し、捕獲位置に移動する（図１０参照）。糸穴１６５を通過する上糸は、糸掴み部材１６０の一端部１６１と共に左方に移動する。捕獲位置では、糸穴１６５は、一端部１８１の屈曲部分の下方に位置する。糸押え部材１８０の把持部１８６は、糸穴１６５の右方に位置し、上下方向において一端部１６１に近接する。一端部１６１と把持部１８６は糸穴１６５と針穴９０の間に延びる上糸を間隙に挟み、且つ上糸を屈曲して保持する。糸掴み機構１５０は、縫製開始時に上糸を保持することで、縫目に上糸の端部を巻き込むことを防止する。   The upper thread of the first stitch at the start of sewing passes through the cloth and extends downward from the needle hole 90 of the needle plate 9 through the thread hole 165 of the thread gripping member 160. After the first sewing needle 7 is separated from the thread hole 165, the thread cutting motor 25 rotates the cam plate 70, and the third link 63 moves rearward according to the rotation direction and angle of the cam plate 70. As shown in FIG. 10, when the third link 63 moves rearward, the thread gripping member 160 rotates counterclockwise when viewed from the bottom and moves to the capture position (see FIG. 10). The upper thread passing through the thread hole 165 moves to the left together with the one end portion 161 of the thread gripping member 160. In the capture position, the thread hole 165 is located below the bent portion of the one end 181. The gripping portion 186 of the thread presser member 180 is located to the right of the thread hole 165 and is close to the one end 161 in the vertical direction. The one end portion 161 and the gripping portion 186 sandwich the upper thread extending between the thread hole 165 and the needle hole 90 in the gap, and bend and hold the upper thread. The thread gripping mechanism 150 holds the upper thread at the start of sewing, thereby preventing the end of the upper thread from being caught in the seam.

捕獲位置では、防護部材１７５は、一端部１６１との間に針穴９０の形成位置を有する位置に移動する。腕部１７０は、第二屈曲部１７２が右後方に屈曲する形状である。故に腕部１７０は、一端部１６１から針穴９０の形成位置の前側を通って延び、第二屈曲部１７２で屈曲して針穴９０右側に位置する防護部材１７５に接続する。故に糸掴み部材１６０が捕獲位置に位置する時、腕部１７０は、針穴９０の形成位置とは上下方向に重ならない。故に腕部１７０は、針穴９０を通る上糸と下糸に干渉しない。   In the capture position, the protection member 175 moves to a position having the formation position of the needle hole 90 between the end portion 161 and the protection member 175. The arm portion 170 has a shape in which the second bent portion 172 bends to the right rear. Therefore, the arm portion 170 extends from the one end portion 161 through the front side of the formation position of the needle hole 90, is bent at the second bent portion 172, and is connected to the protection member 175 located on the right side of the needle hole 90. Therefore, when the thread gripping member 160 is located at the capture position, the arm portion 170 does not overlap the formation position of the needle hole 90 in the vertical direction. Therefore, the arm portion 170 does not interfere with the upper thread and the lower thread that pass through the needle hole 90.

縫製が進行し、所定回数（例えば２〜３回）の針落ち後、糸切用モータ２５はカム板７０を回転し、第三リンク６３はカム板７０の回転方向と角度に応じて更に後方へ移動する。図１１に示すように、第三リンク６３が更に後方へ移動すると、糸掴み部材１６０は底面視反時計回りに回動し、解放位置に移動する（図１１参照）。ピン１６６は、第一当接部１９１を左方に押圧し、引張バネ４５の付勢力に抗して糸押え部材１８０を底面視反時計回りに回動する。解放位置では、糸穴１６５は、糸押え部材１８０の一端部１８１とは前後方向に糸穴１６５の大きさの半分程度ずれて位置する。一端部１６１と把持部１８６の重なる位置が糸穴１６５と針穴９０を結ぶ方向からずれるので、上糸は、一端部１６１と把持部１８６の間隙から抜けやすくなる。縫製が進行すると、布が移動して上糸を引っ張るので、上糸の端部は一端部１６１と把持部１８６の間隙から抜け、糸穴１６５からも抜ける。糸切用モータ２５は、糸掴み部材１６０が解放位置に位置する状態を維持する。ミシン１は、糸穴１６５から抜けた上糸を縫目の中に巻き込んで縫製を続ける。   After the sewing has progressed and the needle drop has occurred a predetermined number of times (for example, 2 to 3 times), the thread trimming motor 25 rotates the cam plate 70, and the third link 63 is further rearward depending on the rotation direction and angle of the cam plate 70. Move to. As shown in FIG. 11, when the third link 63 moves further rearward, the thread gripping member 160 rotates counterclockwise as viewed from the bottom and moves to the release position (see FIG. 11). The pin 166 presses the first contact portion 191 to the left, and rotates the thread presser member 180 counterclockwise as viewed from the bottom against the urging force of the tension spring 45. In the release position, the thread hole 165 is positioned so as to be shifted from the one end 181 of the thread presser member 180 by about half the size of the thread hole 165 in the front-rear direction. Since the overlapping position of the one end portion 161 and the gripping portion 186 is displaced from the direction connecting the thread hole 165 and the needle hole 90, the upper thread is easily pulled out from the gap between the one end portion 161 and the gripping portion 186. As the sewing progresses, the cloth moves and pulls the upper thread, so that the end of the upper thread comes out of the gap between the one end 161 and the gripping part 186 and also comes out of the thread hole 165. The thread trimming motor 25 maintains the state where the thread gripping member 160 is located at the release position. The sewing machine 1 continues sewing by winding the upper thread that has come out of the thread hole 165 into the seam.

解放位置では、防護部材１７５は、固定刃１１０の刃部１１４下方の防護位置に移動する。防護位置では、防護面１７６は、刃部１１４の延伸方向に沿って延びる。防護部材１７５は、刃部１１４を下側から覆い、防護部材１７５と針板９との間に刃部１１４を配置する。図１２に示すように、防護部材１７５が防護位置に位置する時、防護部材１７５の針穴９０側の端部は、刃部１１４よりも針穴９０側に位置する。具体的に、仮想直線Ｖ１は、針穴９０の防護部材１７５が位置する側の縁部Ｅと、固定刃１１０の刃部１１４を結ぶ直線である。防護部材１７５の針穴９０側の端部は、仮想直線Ｖ１に対して交差する。換言すると、刃部１１４は、防護部材１７５の防護面１７６と針穴９０の縁部Ｅを通る仮想直線Ｖ２よりも、針穴９０側に露出しない。   In the release position, the protection member 175 moves to a protection position below the blade portion 114 of the fixed blade 110. In the protective position, the protective surface 176 extends along the extending direction of the blade 114. The protection member 175 covers the blade portion 114 from below, and the blade portion 114 is disposed between the protection member 175 and the needle plate 9. As shown in FIG. 12, when the protection member 175 is located at the protection position, the end of the protection member 175 on the needle hole 90 side is located closer to the needle hole 90 than the blade portion 114. Specifically, the virtual straight line V <b> 1 is a straight line connecting the edge E on the side where the protection member 175 of the needle hole 90 is located and the blade 114 of the fixed blade 110. The end of the protection member 175 on the side of the needle hole 90 intersects the virtual straight line V1. In other words, the blade portion 114 is not exposed to the needle hole 90 side with respect to the virtual straight line V2 passing through the protection surface 176 of the protection member 175 and the edge E of the needle hole 90.

縫製時、図１２中に糸Ｔで表す上糸と下糸は、針穴９０を通り、針板９の下方に延びる。糸Ｔは、縫製状態に応じて針板９下側で前後左右に移動する。防護部材１７５は、糸Ｔの経路上に刃部１１４が露出するのを防ぐ。故に糸Ｔは、固定刃１１０側に移動した時、針穴９０の縁部Ｅと防護部材１７５の防護面１７６には接触するが、刃部１１４には接触しない。防護部材１７５は、糸Ｔが刃部１１４との接触によって糸切れするのを防ぐ。   At the time of sewing, an upper thread and a lower thread represented by a thread T in FIG. 12 pass through the needle hole 90 and extend below the needle plate 9. The thread T moves to the front, back, left and right below the needle plate 9 according to the sewing state. The protection member 175 prevents the blade portion 114 from being exposed on the path of the thread T. Therefore, when the thread T moves to the fixed blade 110 side, it contacts the edge E of the needle hole 90 and the protection surface 176 of the protection member 175, but does not contact the blade 114. The protection member 175 prevents the thread T from being broken by contact with the blade portion 114.

縫製終了前の最終針の時、糸切用モータ２５はカム板７０を回転し、第三リンク６３はカム板７０の回転方向と角度に応じて更に後方へ移動する。図４に示すように、糸掴み部材１６０は底面視反時計回りに回動し、離間位置に移動する。ピン１６６は、第二当接部１９２に移動し、第二当接部１９２を左方に押圧する。糸押え部材１８０は、引張バネ４５の付勢力に抗して更に底面視反時計回りに回動する。第二当接部１９２は第一当接部１９１よりも左側に凹むので、糸押え部材１８０の更なる回動を抑制し、引張バネ４５にかかる負荷を軽減する。離間位置では、防護部材１７５は、固定刃１１０の刃部１１４に対して針穴９０から離間する待避位置に位置する。待避位置は、可動刃１２０が回動しても防護部材１７５が可動刃１２０に接触しない位置である。   At the time of the final stitch before the end of sewing, the thread trimming motor 25 rotates the cam plate 70, and the third link 63 moves further rearward according to the rotation direction and angle of the cam plate 70. As shown in FIG. 4, the thread gripping member 160 rotates counterclockwise when viewed from the bottom, and moves to the separated position. The pin 166 moves to the second contact portion 192 and presses the second contact portion 192 leftward. The thread presser member 180 further rotates counterclockwise as viewed from the bottom against the urging force of the tension spring 45. Since the second contact portion 192 is recessed to the left of the first contact portion 191, further rotation of the thread presser member 180 is suppressed, and the load applied to the tension spring 45 is reduced. In the separated position, the protection member 175 is located at a retracted position away from the needle hole 90 with respect to the blade portion 114 of the fixed blade 110. The retracted position is a position where the protective member 175 does not contact the movable blade 120 even when the movable blade 120 rotates.

糸切用モータ２５は出力軸を駆動し、カム板７０を往復回動し、糸切動作を行う。糸切動作中、糸掴み部材１６０は離間位置に位置する状態を維持する。   The thread cutting motor 25 drives the output shaft, reciprocates the cam plate 70, and performs a thread cutting operation. During the thread trimming operation, the thread gripping member 160 maintains the state of being located at the separated position.

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の第三リンク５３を前後方向へ往復移動する。第三リンク５３が前後方向へ往復移動する時、可動刃１２０は、ピン１１９を介して支軸９１を中心に水平に回動し、一端部１２１を針穴９０の前側の位置と後側の位置との間で往復回動する。糸切機構１００は、糸切時以外は可動刃１２０の一端部１２１を針穴９０の前側の位置に配置する。   The thread trimming link mechanism 50 is driven according to the rotation direction and angle of the cam plate 70, and reciprocates the third link 53 of the thread trimming mechanism 100 in the front-rear direction. When the third link 53 reciprocates in the front-rear direction, the movable blade 120 rotates horizontally around the support shaft 91 via the pin 119, and the one end 121 is moved to the position on the front side and the rear side of the needle hole 90. Reciprocates between positions. The thread trimming mechanism 100 arranges the one end 121 of the movable blade 120 at a position in front of the needle hole 90 except during thread trimming.

糸切用モータ２５の駆動によって第三リンク５３が前方に移動すると、可動刃１２０は底面視反時計回りに回動し、一端部１２１を針穴９０の前側の位置から後側の位置に移動する。防護部材１７５が待避位置に位置するので、可動刃１２０は防護部材１７５に接触しない。一端部１２１が針穴９０の後側に移動する時、可動刃１２０の糸捌き部１２３は針穴９０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。可動刃１２０が針穴９０の後側に位置する時、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９０を通って上方に延びた状態になる。   When the third link 53 moves forward by driving the thread cutting motor 25, the movable blade 120 rotates counterclockwise as viewed from the bottom, and the one end 121 moves from the front position of the needle hole 90 to the rear position. To do. Since the protection member 175 is located at the retracted position, the movable blade 120 does not contact the protection member 175. When the one end portion 121 moves to the rear side of the needle hole 90, the stringing portion 123 of the movable blade 120 passes through the formation position of the needle hole 90. 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 movable blade 120 is positioned on the rear side of the needle hole 90, the side of the upper thread ring that extends from the sewing needle 7 comes into contact with the thread engaging portion 125 and extends upward through the needle hole 90.

糸切用モータ２５が逆向きに駆動して第三リンク５３が後方に移動すると、可動刃１２０は底面視時計回りに回動し、針穴９０の後側の位置から前側の位置に移動する。可動刃１２０の移動過程で、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。可動刃１２０の刃部１２４は、針穴９０の形成位置を、後方から前方へ向けて通過する。可動刃１２０の刃部１２４は、針穴９０の形成位置を通過する時、固定刃１１０の刃部１１４と上下方向に交差する。可動刃１２０の刃部１２４と固定刃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 thread cutting motor 25 is driven in the reverse direction and the third link 53 moves backward, the movable blade 120 rotates clockwise as viewed from the bottom, and moves from the rear position of the needle hole 90 to the front position. . In the process of moving the movable blade 120, the yarn catching portion 127 guides the side of the upper thread ring extending from the cloth and the lower thread 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. The blade portion 124 of the movable blade 120 passes through the formation position of the needle hole 90 from the rear to the front. The blade portion 124 of the movable blade 120 intersects the blade portion 114 of the fixed blade 110 in the vertical direction when passing through the formation position of the needle hole 90. The blade portion 124 of the movable blade 120 and the blade portion 114 of the fixed 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２５の駆動によって第三リンク５３が後方に移動し、可動刃１２０は針穴９０の前側の位置に移動する（図４参照）。糸切機構１００は、糸の切断動作を終了する。糸切用モータ２５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 third link 53 moves rearward by driving the thread cutting motor 25, and the movable blade 120 moves to the front position of the needle hole 90 (see FIG. 4). The yarn cutting mechanism 100 ends the yarn cutting operation. When the output shaft returns to the state before the start of sewing, the thread trimming motor 25 stops driving and enters a non-driving state.

ミシン１は、防護部材１７５を糸掴み部材１６０と一体に設けたことで、糸掴み機構１５０を駆動するだけで、糸掴み動作を行うと共に、防護部材１７５を防護位置と待避位置の間で移動できる。即ちミシン１は、防護部材１７５を防護位置と待避位置の間で移動する為の駆動機構を、糸掴みリンク機構６０の他に設ける必要がない。故にミシン１は、糸掴み部材１６０と糸押え部材１８０を従来の構成の糸掴み機構と差し替えるだけで、糸掴み機構１５０を組み付けることができる。   Since the sewing machine 1 is provided with the protective member 175 integrally with the thread gripping member 160, the thread gripping operation is performed only by driving the thread gripping mechanism 150, and the protective member 175 is moved between the protective position and the retracted position. it can. That is, the sewing machine 1 does not need to provide a drive mechanism for moving the protection member 175 between the protection position and the retracted position in addition to the thread grip link mechanism 60. Therefore, the sewing machine 1 can be assembled with the thread gripping mechanism 150 only by replacing the thread gripping member 160 and the thread presser member 180 with a thread gripping mechanism having a conventional configuration.

以上説明のように、防護部材１７５は、可動刃１２０の非駆動時に防護部材１７５と針板９との間に固定刃１１０の刃部１１４を配置し、固定刃１１０の刃部１１４が上糸と下糸の経路上に位置することを防ぐ。即ち防護部材１７５は、縫製中に上糸と下糸が固定刃１１０の刃部１１４に触れることを防止し、糸切れの可能性を低減できる。防護部材１７５が固定刃１１０の刃部１１４による上糸と下糸の糸切れを防止するので、固定刃１１０は、刃部１１４を従来よりも針穴９０に近づけて配置することができる。故にミシン１は、針穴９０から離れた位置で上糸と下糸を切断した場合と比べ、切断後に布に残る上糸と下糸の切れ端を短くすることができる。   As described above, the protective member 175 has the blade portion 114 of the fixed blade 110 disposed between the protective member 175 and the needle plate 9 when the movable blade 120 is not driven, and the blade portion 114 of the fixed blade 110 is the upper thread. And prevent it from being positioned on the lower thread path. That is, the protection member 175 prevents the upper thread and the lower thread from touching the blade portion 114 of the fixed blade 110 during sewing, and can reduce the possibility of thread breakage. Since the protective member 175 prevents the upper thread and the lower thread from being broken by the blade portion 114 of the fixed blade 110, the fixed blade 110 can be disposed with the blade portion 114 closer to the needle hole 90 than in the prior art. Therefore, the sewing machine 1 can shorten the upper thread and lower thread cut ends remaining on the cloth after cutting, as compared with the case where the upper thread and the lower thread are cut at a position away from the needle hole 90.

縫製時、上糸と下糸は針穴９０を通り、針板９の下方に延びる。防護部材１７５は、防護面１７６の延びる長さが針穴９０の直径Ｄ以上である。故に、上糸と下糸が針穴９０の範囲内で動いても、防護部材１７５は、上糸と下糸が固定刃１１０の刃部１１４に触れることを確実に防止することができる。   At the time of sewing, the upper thread and the lower thread pass through the needle hole 90 and extend below the needle plate 9. In the protection member 175, the extension length of the protection surface 176 is not less than the diameter D of the needle hole 90. Therefore, even if the upper thread and the lower thread move within the range of the needle hole 90, the protection member 175 can reliably prevent the upper thread and the lower thread from touching the blade portion 114 of the fixed blade 110.

糸掴み部材１６０と糸押え部材１８０は、縫製開始時に上糸の端部を挟み、保持することができる。防護部材１７５は、糸掴み部材１６０と一体に設ける。防護部材１７５は、糸掴み部材１６０と糸押え部材１８０が上糸の端部を保持した後、緩めた時に、防護位置に位置する。故にミシン１は、糸掴み部材１６０を駆動するだけで、上糸の保持を行うと共に、防護部材１７５の移動を行うことができるので、別途、防護部材１７５の移動機構を設けなくてもよい。   The thread gripping member 160 and the thread presser member 180 can sandwich and hold the end of the upper thread at the start of sewing. The protection member 175 is provided integrally with the thread gripping member 160. The protection member 175 is positioned at the protection position when the thread gripping member 160 and the thread presser member 180 are loosened after holding the end of the upper thread. Therefore, since the sewing machine 1 can hold the upper thread and move the protection member 175 only by driving the thread gripping member 160, it is not necessary to provide a separate movement mechanism for the protection member 175.

第一屈曲部１７１により腕部１７０が上下方向に屈曲するので、防護部材１７５は防護位置で固定刃１１０の刃部１１４により近づけた状態に配置できる。故に、防護部材１７５は、固定刃１１０の刃部１１４との間隔を短くし、縫製中に上糸と下糸が固定刃１１０の刃部１１４に触れることをより確実に防ぐことができ、糸切れの可能性をより低減できる。   Since the arm portion 170 is bent in the vertical direction by the first bent portion 171, the protection member 175 can be disposed in a state closer to the blade portion 114 of the fixed blade 110 at the protection position. Therefore, the protective member 175 can shorten the distance between the fixed blade 110 and the blade portion 114, and can more reliably prevent the upper thread and the lower thread from touching the blade portion 114 of the fixed blade 110 during sewing. The possibility of cutting can be further reduced.

糸掴み部材１６０が捕獲位置に位置する時、腕部１７０は針穴９０の形成位置とは上下方向に重ならない。故に腕部１７０は、針穴９０を通る上糸と下糸に干渉しにくい。腕部１７０が上糸と下糸に負荷を与えることがないので、ミシン１は円滑に縫製できる。   When the thread gripping member 160 is located at the capture position, the arm portion 170 does not overlap with the formation position of the needle hole 90 in the vertical direction. Therefore, the arm portion 170 is unlikely to interfere with the upper thread and the lower thread that pass through the needle hole 90. Since the arm portion 170 does not apply a load to the upper thread and the lower thread, the sewing machine 1 can be sewn smoothly.

可動刃１２０に駆動力を付与する糸切用モータ２５は、糸掴み部材１６０にも駆動力を付与する。故にミシン１は、糸掴み部材１６０を駆動する為の糸切用モータ２５を別途設ける必要がない。   The thread cutting motor 25 that applies a driving force to the movable blade 120 also applies a driving force to the thread gripping member 160. Therefore, the sewing machine 1 does not need to be separately provided with a thread trimming motor 25 for driving the thread gripping member 160.

可動刃１２０の駆動時、防護部材１７５を可動刃１２０の経路から遠ざける為、糸掴み部材１６０が回動する範囲は従来の防護部材１７５が無い構成よりも大きい。糸押え部材１８０は、糸掴み部材１６０に従動して回動する。糸押え部材１８０は、第一当接部１９１よりもピン１６６と反対側に凹む第二当接部１９２を備えるので、糸掴み部材１６０が解放位置よりも離間位置側に位置する時の糸押え部材１８０の回動量を抑制できる。故にミシン１は、針板９の下側に糸押え部材１８０が回動する為の領域を大きく確保する必要がない。   Since the protection member 175 is moved away from the path of the movable blade 120 when the movable blade 120 is driven, the range in which the thread gripping member 160 rotates is larger than the configuration without the conventional protection member 175. The thread presser member 180 rotates following the thread gripping member 160. Since the thread presser member 180 includes the second contact part 192 that is recessed on the opposite side of the pin 166 from the first contact part 191, the thread presser member when the thread gripping member 160 is positioned on the separated position side from the release position. The amount of rotation of the member 180 can be suppressed. Therefore, the sewing machine 1 does not need to ensure a large area for the thread presser member 180 to rotate below the needle plate 9.

本発明は上記実施形態に限定されず、種々の変更を加えることができる。防護部材１７５は、防護位置で、針穴９０側の端部が仮想直線Ｖ１に交差する位置に配置したが、これに限らない。例えば図１３に示すように、防護部材２７５は、防護位置で、針穴９０側の端部が仮想直線Ｖ１に接する位置に配置してもよい。この場合、刃部１１４は、糸Ｔが接しても糸Ｔに食い込まないので、糸Ｔを切断しない。防護部材２７５を針穴９０に近づけて配置すれば、固定刃１１０は、刃部１１４が針穴９０により近づくよう配置することができる。防護部材２７５は、糸Ｔが針板９下側で縫製状態に応じて移動可能な範囲を広げることができる。   The present invention is not limited to the above embodiment, and various modifications can be made. The protective member 175 is disposed at a position where the end on the side of the needle hole 90 intersects the virtual straight line V1 at the protective position, but is not limited thereto. For example, as shown in FIG. 13, the protection member 275 may be disposed at a position where the end on the needle hole 90 side is in contact with the virtual straight line V <b> 1 in the protection position. In this case, the blade 114 does not cut into the yarn T even if the yarn T comes into contact with the blade portion 114, and therefore does not cut the yarn T. If the protection member 275 is disposed close to the needle hole 90, the fixed blade 110 can be disposed such that the blade portion 114 is closer to the needle hole 90. The protection member 275 can widen the range in which the thread T can move according to the sewing state below the needle plate 9.

本実施形態では、防護部材１７５の防護面１７６の延伸方向の長さＬは、固定刃１１０の刃部１１４の刃渡り長さより短い。これに限らず、防護部材１７５の延伸方向の長さＬは、針穴９０の直径Ｄ以上であれば、固定刃１１０の刃部１１４の刃渡り長さ以上であってもよい。防護部材１７５の延伸方向の長さＬが長いほど、防護部材１７５は、より確実に上糸と下糸が固定刃１１０の刃部１１４に接触することを防止できる。   In the present embodiment, the length L in the extending direction of the protective surface 176 of the protective member 175 is shorter than the blade span length of the blade portion 114 of the fixed blade 110. Not limited to this, the length L in the extending direction of the protection member 175 may be equal to or longer than the blade span length of the blade portion 114 of the fixed blade 110 as long as it is equal to or larger than the diameter D of the needle hole 90. As the length L in the extending direction of the protection member 175 is longer, the protection member 175 can more reliably prevent the upper thread and the lower thread from coming into contact with the blade portion 114 of the fixed blade 110.

防護部材１７５の防護面１７６は延伸方向に延びるが、これに限らない。例えば図１４に示すように、防護部材３７５の防護面３７６は、針穴９０の形状に合わせた弧状に延びてもよい。防護面３７６は、針板９下側に延びる上糸と下糸と固定刃１１０の刃部１１４の間に位置することができる。故に防護部材３７５は、より確実に上糸と下糸が固定刃１１０の刃部１１４に接触することを防止できる。   The protective surface 176 of the protective member 175 extends in the extending direction, but is not limited thereto. For example, as shown in FIG. 14, the protective surface 376 of the protective member 375 may extend in an arc shape that matches the shape of the needle hole 90. The protective surface 376 can be positioned between the upper thread and the lower thread extending below the needle plate 9 and the blade portion 114 of the fixed blade 110. Therefore, the protection member 375 can more reliably prevent the upper thread and the lower thread from coming into contact with the blade portion 114 of the fixed blade 110.

本実施形態では、防護部材１７５は糸掴み部材１６０と一体に設けたが、これに限らない。例えば、防護部材１７５は腕部１７０を介し、糸押え部材１８０と一体に設けてもよい。例えば、防護部材１７５は糸掴み部材１６０と別体に設け、防護位置と待避位置の間を移動してもよい。例えば、糸押え部材１８０を設けず、糸掴み部材１６０が防護部材１７５を防護位置と待避位置の間で移動してもよい。   In the present embodiment, the protection member 175 is provided integrally with the thread gripping member 160, but is not limited thereto. For example, the protection member 175 may be provided integrally with the thread presser member 180 via the arm portion 170. For example, the protective member 175 may be provided separately from the thread gripping member 160 and moved between the protective position and the retracted position. For example, the thread clamp member 180 may not be provided, and the thread gripping member 160 may move the protection member 175 between the protection position and the retracted position.

腕部１７０は第一屈曲部１７１、第二屈曲部１７２がなくてもよい。糸切用モータ２５は、糸押え部材１８０にも駆動力を付与し、糸掴み部材１６０とは独立に糸押え部材１８０を駆動してもよい。糸掴み部材１６０の駆動源は糸切用モータ２５でなく、個別に設けてもよい。糸押え部材１８０の第二当接部１９２は平面視で第一当接部１９１に対して段差を有する凹部形状に設けたが、これに限らない。第二当接部１９２は、例えば第一当接部１９１から滑らかに連続する弧状に設けてもよい。   The arm portion 170 may not have the first bent portion 171 and the second bent portion 172. The thread trimming motor 25 may also apply a driving force to the thread presser member 180 to drive the thread retainer member 180 independently of the thread gripping member 160. The driving source of the thread gripping member 160 may be provided individually instead of the thread cutting motor 25. Although the second contact portion 192 of the thread presser member 180 is provided in a recessed shape having a step with respect to the first contact portion 191 in plan view, the present invention is not limited thereto. For example, the second contact portion 192 may be provided in an arc shape that is smoothly continuous from the first contact portion 191.

上記実施形態において、刃部１１４は、本発明の固定刃の「刃先」に相当する。刃部１２４は、本発明の可動刃の「刃先」に相当する。糸切用モータ２５は、本発明の「動力源」に相当する。一端部１６１は、本発明の「第一端部」に相当する。一端部１８１は、本発明の「第二端部」に相当する。ピン１６６は、本発明の「突出部」に相当する。   In the above embodiment, the blade portion 114 corresponds to the “blade edge” of the fixed blade of the present invention. The blade portion 124 corresponds to the “blade edge” of the movable blade of the present invention. The thread cutting motor 25 corresponds to the “power source” of the present invention. The one end 161 corresponds to the “first end” of the present invention. The one end 181 corresponds to the “second end” of the present invention. The pin 166 corresponds to the “projection” of the present invention.

１ ミシン
７ 縫針
９ 針板
２５ 糸切用モータ
９０ 針穴
１１０ 固定刃
１１４、１２４ 刃部
１２０ 可動刃
１６０ 糸掴み部材
１６１、１８１ 一端部
１６５ 糸穴
１６６ ピン
１７０ 腕部
１７１ 第一屈曲部
１７２ 第二屈曲部
１７５、２７５、３７５ 防護部材
１８０ 糸押え部材
１９０ 当接部
１９１ 第一当接部
１９２ 第二当接部 1 Sewing machine 7 Sewing needle 9 Needle plate 25 Thread trimmer motor 90 Needle hole 110 Fixed blade 114, 124 Blade portion 120 Movable blade 160 Thread gripping member 161, 181 One end portion 165 Thread hole 166 Pin 170 Arm portion 171 First bent portion 172 First Two bent portions 175, 275, 375 Protective member 180 Yarn presser member 190 Contact portion 191 First contact portion 192 Second contact portion

Claims (7)

縫針が通る針穴を有する針板の下側に設け、刃先を前記針穴に向けて配置する固定刃と、
前記針板の下側に水平に回動可能に設け、刃先が前記固定刃の刃先と交差する経路を往復移動可能な可動刃と、
前記可動刃に駆動力を付与し、前記可動刃を往復移動する動力源と、
を備え、
前記動力源による前記可動刃の駆動時、上糸と下糸を前記可動刃で捕捉し、且つ前記可動刃の刃先と前記固定刃の刃先とを交差して前記上糸と下糸を切断するミシンにおいて、
前記可動刃の非駆動時に前記固定刃の下側の防護位置に位置し、前記可動刃の駆動時に前記固定刃の刃先に対し前記針穴から離間する待避位置に位置する防護部材を備え、
前記防護部材が前記防護位置に位置する時、前記固定刃と前記防護部材と前記針穴の中心位置とを含む断面において、前記防護部材の前記針穴側の端部は、前記針穴の前記防護部材が位置する側の縁部と前記固定刃の刃先とを結ぶ仮想直線に対して接触又は交差すること
を特徴とするミシン。 A fixed blade that is provided on the lower side of a needle plate having a needle hole through which a sewing needle passes, and has a cutting edge disposed toward the needle hole;
A movable blade that is provided on the lower side of the needle plate so as to be horizontally rotatable and capable of reciprocating along a path where the blade edge intersects the blade edge of the fixed blade;
A power source for applying a driving force to the movable blade and reciprocating the movable blade;
With
When the movable blade is driven by the power source, the upper thread and the lower thread are captured by the movable blade, and the upper thread and the lower thread are cut by crossing the blade edge of the movable blade and the blade edge of the fixed blade. In the sewing machine
A protective member positioned at a lower protective position when the movable blade is not driven and positioned at a retracted position away from the needle hole with respect to the blade edge of the fixed blade when the movable blade is driven;
When the protective member is located at the protective position, in the cross section including the fixed blade, the protective member, and the center position of the needle hole, the end portion of the protective member on the needle hole side is the needle hole side. A sewing machine that contacts or intersects an imaginary straight line connecting an edge on a side where a protective member is located and a blade edge of the fixed blade. 前記固定刃の刃先は前記針穴の中心線に直交する延伸方向に延び、
前記防護部材は、前記針穴側の端部が前記延伸方向に沿って延び、前記針穴の直径以上の長さを有すること
を特徴とする請求項１に記載のミシン。 The cutting edge of the fixed blade extends in the extending direction perpendicular to the center line of the needle hole,
2. The sewing machine according to claim 1, wherein an end of the protective member on the side of the needle hole extends along the extending direction and has a length equal to or greater than a diameter of the needle hole. 前記針板の下側に水平に回動可能に設け、前記上糸が通る糸穴を第一端部に有し、縫製開始時に前記糸穴を前記針穴の下方に位置する準備位置と、前記準備位置に対し前記糸穴を前記針穴から離れた位置に位置する離間位置との間で移動する糸掴み部材と、
前記針板の下側に水平に回動可能に設け、前記糸掴み部材の前記第一端部との間に前記上糸を挟んで保持可能な第二端部を有し、前記糸掴み部材に従動し、前記第二端部が前記糸穴と上下方向に重なる位置に移動して前記上糸を挟む糸押え部材と、
を備え、
前記糸掴み部材と前記防護部材は、前記糸掴み部材が前記準備位置から前記離間位置に向けて移動する方向と反対方向に前記第一端部から延びる腕部を介して一体に設け、
前記糸掴み部材は、前記準備位置と前記離間位置の間の捕獲位置に移動した時、前記糸穴が前記第二端部と上下方向に重なる位置に移動し、且つ前記捕獲位置と前記離間位置の間の解放位置に移動した時、前記糸穴が前記第二端部から離間する位置に移動して前記上糸の保持を緩め、
前記防護部材は、前記糸掴み部材が前記解放位置に移動した時、前記防護位置に位置すること
を特徴とする請求項１又は２に記載のミシン。 A preparation position in which a thread hole through which the upper thread passes is provided at a first end portion so as to be horizontally rotatable under the needle plate, and the thread hole is positioned below the needle hole at the start of sewing; A thread gripping member that moves between the preparation position and a separation position that is located at a position away from the needle hole;
The thread gripping member is provided below the needle plate so as to be horizontally rotatable, and has a second end portion capable of holding the upper thread between the first end portion of the thread gripping member and holding the upper thread. A thread presser member that moves to a position where the second end portion overlaps with the thread hole in the vertical direction and sandwiches the upper thread,
With
The thread gripping member and the protection member are integrally provided via an arm portion extending from the first end in a direction opposite to the direction in which the thread gripping member moves from the preparation position toward the separation position,
When the thread gripping member moves to a capture position between the preparation position and the separation position, the thread hole moves to a position overlapping the second end portion in the vertical direction, and the capture position and the separation position The thread hole moves to a position away from the second end and loosens the upper thread,
The sewing machine according to claim 1 or 2, wherein the protection member is located at the protection position when the thread gripping member is moved to the release position. 前記糸掴み部材は、前記固定刃よりも下方に位置し、
前記腕部は上下方向に屈曲し、前記防護部材を前記第一端部よりも上方に配置する第一屈曲部を有することを特徴とする請求項３に記載のミシン。 The thread gripping member is located below the fixed blade,
4. The sewing machine according to claim 3, wherein the arm portion is bent in a vertical direction, and has a first bent portion that disposes the protection member above the first end portion. 前記糸掴み部材が前記捕獲位置に位置する時、前記防護部材と前記第一端部、及び前記腕部と前記糸掴み部材の回動中心は夫々前記針穴の形成位置を間にして反対側に位置し、
前記腕部は前記糸掴み部材の回動中心と反対側に水平方向に屈曲する第二屈曲部を有することを特徴とする請求項３又は４に記載のミシン。 When the thread gripping member is located at the capture position, the rotation center of the protection member and the first end, and the arm part and the thread gripping member are opposite to each other with the needle hole forming position in between. Located in
5. The sewing machine according to claim 3, wherein the arm portion has a second bent portion that is bent in a horizontal direction on a side opposite to a rotation center of the thread gripping member. 前記動力源は、前記糸掴み部材に駆動力を付与し、前記糸掴み部材を前記準備位置と前記離間位置との間で移動することを特徴とする請求項３〜５の何れかに記載のミシン。   6. The power source according to claim 3, wherein the power source applies a driving force to the thread gripping member and moves the thread gripping member between the preparation position and the separation position. sewing machine. 前記糸掴み部材は、前記糸掴み部材の回動中心と前記第一端部との間に、上下方向に突出する突出部を備え、
前記糸押え部材は、前記糸押え部材の回動中心と前記第二端部との間に、前記糸掴み部材が前記準備位置から前記解放位置に移動する時に前記突出部が当接する側面である当接部を備え、
前記突出部は、前記糸掴み部材が前記準備位置から前記解放位置に移動する時に前記当接部に当接して前記糸押え部材を前記糸掴み部材と同じ方向に回動させ、
前記当接部は、
前記糸掴み部材が前記準備位置から前記解放位置までの間に位置する時に前記突出部が当接する第一当接部と、
前記糸掴み部材が前記解放位置よりも前記離間位置側に位置する時に前記突出部が当接し、前記第一当接部よりも前記突出部と反対側に凹む第二当接部と、
を含むこと
を特徴とする請求項６に記載のミシン。 The thread gripping member includes a protruding portion that protrudes in the vertical direction between the rotation center of the thread gripping member and the first end.
The thread presser member is a side surface on which the protruding portion abuts between the rotation center of the thread presser member and the second end when the thread gripping member moves from the preparation position to the release position. A contact portion,
The protruding portion contacts the contact portion when the thread gripping member moves from the preparation position to the release position, and rotates the thread presser member in the same direction as the thread gripping member.
The contact portion is
A first abutting portion with which the protrusion abuts when the thread gripping member is located between the preparation position and the release position;
A second abutting portion that abuts the projecting portion when the thread gripping member is located on the side of the separated position from the release position, and that is recessed to the opposite side of the projecting portion from the first abutting portion;
The sewing machine according to claim 6, comprising:

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