JPS5940943Y2 - Straight stitch mechanism of pattern sewing machine - Google Patents

Description

【考案の詳細な説明】 本考案は模様縫いミシンの直線縫い機構に関するもので
ある。[Detailed Description of the Invention] The present invention relates to a straight stitch mechanism for a pattern stitch sewing machine.

本考案の実施例を図面により説明すると、ミシン機枠（
図示しない）のアーム部内の上方部において、ミシン主
軸（図示しない）との直交方向に回転可能に支持し、且
つ斜歯車１を介して主軸に連動して回転するカム軸２上
に複数の振りカムと複数の送りカムと一つの円形カム３
とを積層した模様カムユニット４をカム軸２と共に回転
するように設置し、このカム軸２左側に支軸５をカム軸
２に平行に支持し、その支軸５に一側部６ａを長くして
コ字状に形成し、その両側部６ａ、６ｂ上端に平行に対
向する一対の支片６Ｃ，６Ｃを形成した揺動枠６を上記
模様カムユニット４を挾むように設は且つ支軸５の軸線
を中心に揺動可能に支持すると共に、揺動枠６と機枠（
図示しない）との間に適宜配置したばね７により揺動枠
６を常には支軸５を中心に第１図時計方向に作用力を付
与する。To explain the embodiment of the present invention using drawings, the sewing machine frame (
In the upper part of the arm of the sewing machine (not shown), a plurality of swings are mounted on a camshaft 2 that is rotatably supported in a direction orthogonal to the main shaft of the sewing machine (not shown) and rotates in conjunction with the main shaft via a helical gear 1. Cam, multiple feed cams and one circular cam 3
A patterned cam unit 4 is installed to rotate together with the camshaft 2, and a support shaft 5 is supported on the left side of the camshaft 2 in parallel to the camshaft 2. A swinging frame 6 is formed in a U-shape, and has a pair of supporting pieces 6C, 6C facing each other in parallel on the upper ends of both sides 6a, 6b. The swing frame 6 and the machine frame (
(not shown), a spring 7 is appropriately arranged between the swing frame 6 and the swing frame 6 to apply a force acting clockwise in FIG. 1 about the support shaft 5 at all times.

支軸５の上方には上端に上記模様カムユニット４の一つ
のカムに係合する係合部を形成すると共に、下端をコ字
状に折曲形成して後端面に縦方向の長孔８ａを形成し、
且つ中央基部にも案内孔８ｂを形成したカム追従子８の
下端を揺動可能に、且つ軸方向に摺動可能に支持し、揺
動枠６の支片６Ｃ，６Ｃ間に上記案内孔８ｂ内を貫通す
る案内軸９を配置する。Above the support shaft 5, an engaging portion that engages with one cam of the patterned cam unit 4 is formed at the upper end, and the lower end is bent into a U-shape to form a longitudinal long hole 8a in the rear end surface. form,
The lower end of the cam follower 8, which also has a guide hole 8b formed in the central base, is supported swingably and slidably in the axial direction, and the guide hole 8b is provided between the support pieces 6C of the swing frame 6. A guide shaft 9 is arranged to pass through the inside.

ミシンアーム部内の上記揺動枠６より下方において、回
動軸１０をカム軸２に直交する軸線を中心に回動可能に
支持すると共に、この回動軸１０に平行に操作軸（図示
しない）をその一端をミシン機枠の後端面から突出して
回動可能に支持し、その突出端には操作ダイアル（図示
しない）を固定する。A rotating shaft 10 is supported below the swinging frame 6 in the sewing machine arm so as to be rotatable about an axis perpendicular to the camshaft 2, and an operating shaft (not shown) is provided parallel to the rotating shaft 10. One end thereof projects from the rear end surface of the sewing machine frame and is rotatably supported, and an operation dial (not shown) is fixed to the projecting end.

回動軸１０には切り離しカム１１．選択カム１２及び振
り幅制御カム１３を順次固定配置すると共に、平歯車１
４に噛合うピニオン（図示しない）により操作軸（図示
しない）に連動させる。The rotation shaft 10 has a separation cam 11. The selection cam 12 and the amplitude control cam 13 are sequentially fixedly arranged, and the spur gear 1
A pinion (not shown) that meshes with the operating shaft (not shown) is interlocked with the operating shaft (not shown).

なお、振り幅制御カム１３には、高位部（第４図Ａ）と
低位部（第４図Ｂ）及び凸部（第４図Ｃ）を設ける。The amplitude control cam 13 is provided with a high portion (FIG. 4A), a low portion (FIG. 4B), and a convex portion (FIG. 4C).

上記支軸５の一端には上下方向の係合部１５ａを設けた
揺動体１５の下端部を揺動可能に支持すると共に、揺動
枠６の一方の支片６Ｃから突出させた案内軸９の一端を
揺動体１５の上端部に連結する。A guide shaft 9 that swingably supports the lower end of a swinging body 15 provided with a vertical engagement portion 15a at one end of the support shaft 5, and protrudes from one support piece 6C of the swing frame 6 One end is connected to the upper end of the rocking body 15.

この揺動体１５の係合部１５ａには、一端を針棒揺動体
１６に連結し、常には巻ばね１７の弾性力を受けて右方
向に作用力を付与した連動杆１８の他端部に設けた腕１
８ａ先端の係合ピン１８ｂが圧接係合する。The engaging portion 15a of the oscillating body 15 has one end connected to the needle bar oscillating body 16, and the other end of an interlocking rod 18 which normally receives the elastic force of the coil spring 17 and applies an acting force in the right direction. provided arm 1
The engagement pin 18b at the tip of 8a is pressed into engagement.

また、支軸５の一端には、一端に振り幅制御カム１３の
カム面１３ａに係合する接触部１９ａを有し、他端に連
動杆１８の他端に設けた二叉部１８ｃ内に遊嵌するピン
１９ｂを設けた支持体１９の中間部を回動可能に且つ常
に反時計方向に作用力を付与して支持する。Further, one end of the support shaft 5 has a contact portion 19a that engages with the cam surface 13a of the swing width control cam 13, and a forked portion 18c provided at the other end of the interlocking rod 18 at the other end. The intermediate portion of the support body 19 provided with the loosely fitted pin 19b is rotatably supported by always applying an acting force in the counterclockwise direction.

このため、振り幅制御カム１３のカム面１３ａの変化に
より支持体１９を介して連動杆１８が上下方面に移動さ
れ、これにより揺動体１５の係合部１５ａに対する腕１
８ａの係合ピン１８ｂの係合位置が変化する。Therefore, due to the change in the cam surface 13a of the swing width control cam 13, the interlocking rod 18 is moved vertically via the support body 19, and thereby the arm 1 relative to the engaging portion 15a of the rocking body 15
The engagement position of the engagement pin 18b of 8a changes.

切り離しカム１１の外周面は高位部と低位部とが交互に
形成されており、このカム１１の上方において中間部側
面にカム１１の外周面に係合する係合ピン（図示しない
）を設けた伝動体２０の一端をその他。The outer circumferential surface of the separation cam 11 is formed with alternating high and low portions, and above the cam 11, an engaging pin (not shown) that engages with the outer circumferential surface of the cam 11 is provided on the side surface of the intermediate portion. One end of the transmission body 20 is connected to the other end.

端上端縁２０ａが揺動枠６の一側部６ａの下端縁に対向
するように回動軸１０に平行な軸２１を中心に回動可能
に支持すると共に、機枠との間に適宜配置したばね２２
により常には反時計方向（第１図）の作用力を付与する
。It is rotatably supported around a shaft 21 parallel to the rotation axis 10 so that the upper end edge 20a of the swing frame 6 faces the lower edge of the one side 6a of the swing frame 6, and is appropriately arranged between the swing frame 6 and the machine frame. Shita spring 22
Therefore, an acting force is always applied in the counterclockwise direction (Fig. 1).

選択カム１２の左側方（第１図）において、上端にカム
追従子８の長孔８ａ内に遊嵌するピン（図示しない）を
設は中間部に選択カム１２の外周カム面に係合する係合
部２３ａを形成した中間体２３の下端を回動軸１０に平
行な軸２４を中心に回動可能に支持すると共に、機枠と
の間に適宜配置したばね２５により上記係合部２３ａが
選択カム１２の外周カム面に常に圧接係合するよう時計
方向（第１図）の作用力を付与する。On the left side of the selection cam 12 (FIG. 1), a pin (not shown) that loosely fits into the elongated hole 8a of the cam follower 8 is provided at the upper end and engages with the outer cam surface of the selection cam 12 at the middle part. The lower end of the intermediate body 23 forming the engaging portion 23a is rotatably supported around a shaft 24 parallel to the rotating shaft 10, and the engaging portion 23a is supported by a spring 25 appropriately arranged between the engaging portion 23a and the machine frame. Applying force in the clockwise direction (FIG. 1) so that the selection cam 12 always presses into contact with the outer peripheral cam surface of the selection cam 12.

選択カム１２には、カム追従子８を上記模様カムユニッ
ト４の複数の振りカム及び円型カム３のうちの一つに選
択的に対向させるための複数のカム面が形成されている
。The selection cam 12 is formed with a plurality of cam surfaces for selectively causing the cam follower 8 to face one of the plurality of swing cams and the circular cam 3 of the pattern cam unit 4.

ミシンアーム部先端のあご部（図示しない）には、軸１
６ａにより揺動可能に支持した針棒揺動体１６を設け、
針棒揺動体１６に上下動可能に支持すると共に、ミシン
の主軸に連動して上下動しその下端に針２６を支持した
針棒２７の下方には、ミシンベッド（図示しない）上に
配置し、布送り方向と直交する方向に長孔２８ａを形成
すると共に、布送り方向に平行に数条の切り欠き２８ｂ
を間隔をおいて形成した平担な板状の針板２８を設ける
。The jaw (not shown) at the tip of the sewing machine arm has a shaft 1.
A needle bar swinging body 16 is provided swingably supported by 6a,
A needle bar 27 is supported on the needle bar oscillating body 16 so as to be movable up and down, moves up and down in conjunction with the main shaft of the sewing machine, and supports a needle 26 at its lower end. , a long hole 28a is formed in a direction perpendicular to the cloth feeding direction, and several cutouts 28b are formed in parallel to the cloth feeding direction.
A flat plate-shaped needle plate 28 is provided with spaces between the throat plate 28.

ミシン機構に連動して四運動する複数の送り歯２９は布
を布送り方向に送るときには切り欠き２８ｂから突出し
、布に係合して布を前進するようにする。A plurality of feed teeth 29, which move in conjunction with the sewing machine mechanism, protrude from the notch 28b when feeding the cloth in the cloth feeding direction, engage with the cloth, and move the cloth forward.

本考案は以上の構成であり、次にその作用を説明する。The present invention has the above configuration, and its operation will be explained next.

先づ、操作ダイヤル（図示しない）を回動操作すると、
操作軸（図示しない）、ピニオン（図示しない）、平歯
車１４及び回動軸１０を介して切り離しカム１１．選択
カム１２及び振り幅制御カム１３が回動する。First, when you turn the operation dial (not shown),
The disconnection cam 11. The selection cam 12 and the amplitude control cam 13 rotate.

この回動により、切り離しカム１１の高位部により、係
合ピン（図示しない）を介して伝動体２０がばね２２の
弾性力に抗して時計方向（第１図）に回動され、その他
端上端糸ｔ２０ ａが揺動枠６の一側部６ａの下端縁を
上方に押し上げ、揺動枠６に付与した弾性作用力に抗し
て、揺動枠６は支軸５上を反時計方向に回動する。Due to this rotation, the transmission body 20 is rotated clockwise (FIG. 1) by the high portion of the separation cam 11 via the engagement pin (not shown) against the elastic force of the spring 22, and the other end The upper end thread t20a pushes up the lower edge of one side 6a of the swing frame 6, and against the elastic force applied to the swing frame 6, the swing frame 6 moves counterclockwise on the support shaft 5. Rotate to.

この回動により案内軸９を介してカム追従子８は揺動枠
６と共に支軸５上を反時計方向に回動して、その上端の
係合部が模様カムユニツｌ−４のカム面から離れる。Due to this rotation, the cam follower 8 rotates counterclockwise on the support shaft 5 together with the swing frame 6 via the guide shaft 9, and the engaging portion at the upper end of the cam follower 8 moves from the cam surface of the pattern cam unit l-4. Leave.

また、切り離しカム１１の低位部が係合ピン（図示しな
い）に対向すると伝動体２０がばね２２の作用力により
反時計方向に回動してその他端上端縁２０ａによる揺動
枠６の押し上げが解除され、揺動枠６はそれに付与した
弾性作用力により上記とは反対方向に回動して、カム追
従子８の上端の係合部が模様カムユニット４の対向する
カム面に圧接係合するようになる。Further, when the lower part of the separation cam 11 faces an engagement pin (not shown), the transmission body 20 is rotated counterclockwise by the acting force of the spring 22, and the swing frame 6 is pushed up by the upper edge 20a of the other end. When the swing frame 6 is released, the swing frame 6 rotates in the opposite direction to the above due to the elastic acting force applied thereto, and the engagement portion at the upper end of the cam follower 8 presses into engagement with the opposing cam surface of the pattern cam unit 4. I come to do it.

切り離しカム１１の回動によりその高位部と低位部が交
互に伝動体２０の係合ピン（図示しない）に対向する毎
に追従子８の上端の係合部が模様カムユニット４のカム
面に係合及び離脱を交互にくり返すようになる。As the separation cam 11 rotates, the upper end of the follower 8 is brought into contact with the cam surface of the pattern cam unit 4 each time its high and low parts alternately face the engagement pin (not shown) of the transmission body 20. Engagement and disengagement will be repeated alternately.

そして、その離脱の間に選択カム１２のカム面変化によ
り中間体２３を介してカム追従子８は支軸５上を軸方向
に摺動されて、複数の振りカム及び円形カムのうちの−
っのカムとの対向位置に選択的に規制される。During the separation, the cam follower 8 is slid in the axial direction on the support shaft 5 via the intermediate body 23 due to the change in the cam surface of the selection cam 12, and the -
selectively regulated to a position facing the cam.

そして、回動軸１０の回動に関連して移動するように、
ミシン機枠に適宜配置した模様表示パネルの指針（図示
しない）が選択する縫模様の表示に一致したときに、操
作ダイヤル（図示しない）の操作を止めれば、その縫模
様に関する振りカムまたは円形カムとの対向位置にカム
追従子８がセットされる。Then, so as to move in relation to the rotation of the rotation shaft 10,
When the needle (not shown) on the pattern display panel appropriately placed on the sewing machine frame matches the display of the selected sewing pattern, if you stop operating the operation dial (not shown), the swing cam or circular cam for that sewing pattern A cam follower 8 is set at a position opposite to.

そして、ミシンが駆動されると、模様カムユニット４が
回転上、このときカム追従子８は円形カム３に対向して
いる場合には、カム面変化が生じないので、これら追従
子８は静止したままである（ここ状態は直線縫いに対応
する）が、振りカムに対向している場合は、そのカム面
変化に追従して支軸５上を揺動するようになる。When the sewing machine is driven, the pattern cam unit 4 rotates, and if the cam followers 8 are opposed to the circular cam 3 at this time, the cam surface does not change, so these followers 8 remain stationary. (this state corresponds to straight stitching), but if it is facing the swing cam, it will swing on the spindle 5 following the change in the cam surface.

カム追従子８の揺動による揺動枠６の案内軸９の揺動に
連動して、揺動体１５が支軸５上を揺動するようになり
、この揺動により係合ピン１８ｂを介して、連動杆１８
が第１図の左右方向に往復動され、送り歯２９による布
の送りと関連して縫模様が形成される。In conjunction with the swinging of the guide shaft 9 of the swinging frame 6 due to the swinging of the cam follower 8, the swinging body 15 comes to swing on the support shaft 5, and due to this swinging, the te, interlocking rod 18
is reciprocated in the left-right direction in FIG. 1, and a sewing pattern is formed in conjunction with the feed of the cloth by the feed dog 29.

この針棒２６の振り幅、すなわち、連動杆１８の移動量
は揺動体１５の係合部１５ａに対する係合ピン１８ｂの
位置により決定され、この係合ピン１８ｂの係合位置が
揺動体１５の揺動中心である支軸５の軸心から遠くなる
にしたがって針棒の振幅が大きくなり、軸心に近くなる
にしたがって連動杆１８の移動量、すなわち、針棒の振
幅が小さくなる３この揺動体１５の係合部１５ａに対す
る連動杆１８の係合ピン１８ｂの位置は振り幅制御カム
１３のカム面１３ａにより決定され、回動軸１０の回動
によりそのカム面１３ａが変化するとその変化に追従し
て支持体１９が支軸５上を一方向あるいは逆方向に回動
するようになり、この回動によって、そのピン１９ｂ及
び連動杆１８の二叉部１８Ｃを介して連動杆１８を上下
方向に移動され、これにより上記係合ピン１８ｂの係合
位置が決定される。The swing width of the needle bar 26, that is, the amount of movement of the interlocking rod 18 is determined by the position of the engagement pin 18b with respect to the engagement portion 15a of the oscillating body 15. The amplitude of the needle bar increases as it moves away from the axis of the support shaft 5, which is the center of oscillation, and the amount of movement of the interlocking rod 18, that is, the amplitude of the needle bar decreases as it approaches the axis. The position of the engagement pin 18b of the interlocking rod 18 with respect to the engagement portion 15a of the moving body 15 is determined by the cam surface 13a of the swing width control cam 13, and when the cam surface 13a changes due to the rotation of the rotation shaft 10, the position changes depending on the change. Following this, the support body 19 begins to rotate on the support shaft 5 in one direction or the opposite direction, and this rotation causes the interlocking rod 18 to move up and down via the pin 19b and the bifurcated portion 18C of the interlocking rod 18. This determines the engagement position of the engagement pin 18b.

そしてこの振り幅制御カム１３のカム面１３ａは選択さ
れた縫模様にとって最適な振幅となるように係合ピン１
８ｂの係合位置を決定するように形成されている。The cam surface 13a of this swing width control cam 13 is adjusted so that the engaging pin 13 has an optimum amplitude for the selected sewing pattern.
8b is formed to determine the engagement position.

上述したように追従子８の係合部が円型カム３に対向し
ている場合は追従子８は静止した状態において、案内軸
９、揺動体１５、連動杆１８、及び針棒揺動体１６を介
して針棒２６を第３図実線の位置にお・く。As described above, when the engaging portion of the follower 8 faces the circular cam 3, the guide shaft 9, the swinging body 15, the interlocking rod 18, and the needle bar swinging body 16 are connected to each other while the follower 8 is stationary. 3, and place the needle bar 26 in the position shown by the solid line in FIG.

この時支持体１９の接触部１９ａは振幅制御カム１３の
カム面１３ａの高位部（第４図Ａ）に係合して支持体１
９が第４図イの位置にあり、連動杆１８の係合ピン１８
ｂが揺動体１５の下部において揺動体１５の係合部１５
ａに圧接係合している。At this time, the contact portion 19a of the support body 19 engages with the high portion (FIG. 4A) of the cam surface 13a of the amplitude control cam 13, and the support body 19
9 is in the position shown in Fig. 4A, and the engagement pin 18 of the interlocking rod 18
b is the engagement portion 15 of the rocking body 15 at the lower part of the rocking body 15;
It is press-fitted to a.

この状態で、ミシンを駆動すると針２７は針孔２８ａの
中央部で上下動しながら布を送り第２図点線で示すよう
に送り歯２９を逸れた直線縫い目Ｘ（中基線縫い目）を
形成する。In this state, when the sewing machine is driven, the needle 27 moves up and down at the center of the needle hole 28a and feeds the fabric to form a straight seam .

追従子８の係合部が円型カム３に対向したま・振り幅制
御カム１３を回動して、支持体１９の接触部１９ａが振
り幅制御カム１３のカム面１３ａ低位部（第４図Ｂ）に
係合すると、支持体１９は支軸５を軸として反時計方向
（第４図）に回動して連動杆１８を上方に移動する。While the engaging part of the follower 8 faces the circular cam 3, the swing width control cam 13 is rotated, and the contact part 19a of the support body 19 contacts the lower part (fourth part) of the cam surface 13a of the swing width control cam 13. When engaged as shown in FIG. B), the support body 19 rotates counterclockwise (FIG. 4) about the support shaft 5 and moves the interlocking rod 18 upward.

この時、揺動体１５の下端に設けられた脚部１５ｂの左
側部が振り幅制御カム１３の突出部１３ｂの右側面（第
４図Ｃ）に係合して、揺動体１５を支軸５を軸として反
時計方向（第４図）に回動して連動杆１８の係合ピン１
８ｂを揺動体１５の上部において揺動体１５の係合部１
５ａに圧接係合して左方向に移動すると共に、追従子８
の係合部は案内軸９を介して円型カム３のカム面より離
脱する。At this time, the left side of the leg 15b provided at the lower end of the swinging body 15 engages with the right side (FIG. 4C) of the protrusion 13b of the swing width control cam 13, and the swinging body 15 is moved to the support shaft 5. The engagement pin 1 of the interlocking rod 18 is rotated counterclockwise (Fig. 4) about the axis.
8b to the upper part of the oscillating body 15 and the engaging part 1 of the oscillating body 15.
5a and moves to the left, and the follower 8
The engaging portion separates from the cam surface of the circular cam 3 via the guide shaft 9.

連動杆１８の左方向への移動によって針棒２６は第３図
実線の位置から二点鎖線の位置に移動し、ミシンが駆動
すると針２７は針孔２８ａの左側部で上下動しながら布
を送り、第２図一点鎖線で示すように送り歯２９の上を
通るように直線縫い目Ｙ（左基線縫い目）を形成する。By moving the interlocking rod 18 to the left, the needle bar 26 moves from the position shown by the solid line in FIG. Then, as shown by the dashed line in FIG. 2, a straight seam Y (left baseline seam) is formed so as to pass over the feed dog 29.

以上述べたように、本考案は、ミシン主軸に連動して固
定軸線を中心に回動する複数の模様カム群４と、その模
様カムの一つに選択的に係合しカム面変化により揺動量
を変える追従子８と、追従子８に連動して揺動する揺動
体１５と、一端を針棒揺動体１６に連結し常には弾性力
を受けて他端を揺動体１５に圧接させることにより追従
子８を模様カム４外周に圧接させる連動体１８と、一端
に接触部１９ａを形威し他端を連動体に連結し固定軸線
を中心に回動可能とした支持体１９とを備えた模様縫い
ミシンにおいて、揺動体１５に揺動中心より離れる方向
に伸びた脚部１５ｂを設け、手回動操作により斬新定位
置に回動したとき、支持体１９の接触部１９ａに係合し
、支持体１９を回動して、連動体１８の他端を揺動体１
５の揺動中心から離れた位置に移動する第１のカム面１
３ａ及び揺動体１５の脚部１５ｂに係合し揺動体１５を
回動して追従子８を模様カム４外周から隔離する方向に
回動する第２のカム面１３ｂを形成し、直線縫い目が送
り歯２９を通るように第１及び第２のカム面１３ａ、
１３ｂにより連動体１８を介して針棒揺動体１６を移動
するカム体１３とを設けたものである。As described above, the present invention includes a plurality of pattern cam groups 4 that rotate about a fixed axis in conjunction with the main shaft of the sewing machine, and a pattern cam that selectively engages one of the pattern cams and oscillates by changing the cam surface. A follower 8 that changes the amount of movement, a rocker 15 that swings in conjunction with the follower 8, one end of which is connected to the needle bar rocker 16, and the other end is always pressed against the rocker 15 under elastic force. The interlocking body 18 presses the follower 8 against the outer periphery of the pattern cam 4, and the supporting body 19 has a contact portion 19a at one end, connects the other end to the interlocking body, and is rotatable about a fixed axis. In the pattern stitch sewing machine, the swinging body 15 is provided with a leg portion 15b extending away from the center of swing, and the leg portion 15b engages with the contact portion 19a of the support body 19 when the leg portion 15b is rotated to the novel fixed position by manual rotation operation. , rotate the support body 19 to connect the other end of the interlocking body 18 to the rocking body 1.
The first cam surface 1 moves to a position away from the swing center of 5.
3a and the leg portions 15b of the rocking body 15 to form a second cam surface 13b that rotates the rocking body 15 in a direction to separate the follower 8 from the outer periphery of the pattern cam 4. first and second cam surfaces 13a so as to pass through the feed dog 29;
A cam body 13 that moves the needle bar oscillating body 16 via an interlocking body 18 by means of a cam body 13b is provided.

従来、この種の模様縫いミシンにおいては、直線縫い目
が送り歯２９から離れその側方を通るものがあり、布の
縁部を直線縫いする場合には送り歯２９が布押えと共同
して布の縫い目から離れた部分を挾んで送るので縫い目
部分は不安定な状態で確実に送られず縫い目が不揃いと
なり製品の価値を著しく低下する欠点があった。Conventionally, in this type of pattern stitch sewing machine, the straight seam sometimes separates from the feed dog 29 and passes along the side thereof, and when sewing the edge of the fabric in a straight line, the feed dog 29 works together with the presser foot to move the fabric. Since the part away from the seam is pinched and fed, the seam part is unstable and cannot be fed reliably, resulting in uneven seams, which significantly reduces the value of the product.

この欠点をなくするために、直線縫い目が送り歯２９を
送る位置に交換するために前述した模様カム群４に円型
カムを設け、円型カムに追従子８が係合したとき、追従
子８に関連する揺動手段たる揺動体１５、連動体１８を
介して針棒２６を所定位置に移動するものが提案されて
いるが、その位置に対応する円型カムを設けたのでそれ
だけ模様縫いの種類が少くなり、縫い機能が低下して模
様縫いミシンとしての商品価値が減少する欠点があった
。In order to eliminate this drawback, a circular cam is provided in the pattern cam group 4 described above in order to replace the straight seam with the position where the feed dog 29 is sent, and when the follower 8 engages with the circular cam, the follower It has been proposed that the needle bar 26 is moved to a predetermined position via a rocking body 15 and an interlocking body 18, which are rocking means related to 8, but since a circular cam corresponding to that position is provided, pattern sewing is much easier. This had the disadvantage that the number of types was reduced, the sewing function was reduced, and the commercial value of the pattern sewing machine was reduced.

本考案は前記の欠点をなくすることを目的とし、直線縫
いするとき縫い目が確実に送り歯２９を通るように針棒
２６を移動することができるようにしたので、布の縁部
を直線縫いする場合に、送り歯２９が布押えと共同して
布縁部を挾んで確実に布送り方向に送るから、縫い目の
揃った商品価値の高い製品を得るのに効果があり、さら
に、ひものように巾の狭いものを縫うのに効果がある。The purpose of this invention is to eliminate the above-mentioned drawbacks, and the needle bar 26 can be moved to ensure that the seam passes through the feed dog 29 when sewing a straight line, so the edge of the fabric can be sewn in a straight line. In this case, the feed dog 29 cooperates with the presser foot to pinch the edge of the fabric and feed it in the fabric feeding direction, which is effective in obtaining products with high commercial value and uniform seams. It is effective for sewing narrow width items.

また直線縫い目が送り歯２９を通るように針棒２６を移
動するのにカム体１３にカム面１３ａ、 １３ｂを設け
たので、前述のように所定位置に対応する円型カムに代
えて模様カムを設けることができるから模様カムの数が
多くなり、それだけ模様縫いの数がふえ、縫い機能が向
上して模様縫いミシンとしての商品価値が高くなる等大
いに効果がある。In addition, since the cam body 13 is provided with cam surfaces 13a and 13b for moving the needle bar 26 so that the straight stitch passes through the feed dog 29, a pattern cam is used instead of the circular cam corresponding to a predetermined position as described above. Since the number of pattern cams can be increased, the number of pattern stitches can be increased accordingly, the sewing function is improved, and the product value of the pattern stitch sewing machine is increased.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は、本考案の他を省略した要部の斜視図であり、
第２，３図は作用説明図であり、第４図は支持体、揺動
体、及び連動杆の関係を示す説明図である。 図中、１３は振り幅制御カム、１５は揺動体、１８は連
動杆１９は支持体である。FIG. 1 is a perspective view of the main parts of the present invention, with other parts omitted;
2 and 3 are action explanatory diagrams, and FIG. 4 is an explanatory diagram showing the relationship between the support body, the swinging body, and the interlocking rod. In the figure, 13 is a swing width control cam, 15 is a swinging body, and 18 is an interlocking rod 19 is a support body.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] ミシンの主軸に連動して上下動する針棒を支持しミシン
機枠に対して布送り方向との直交方向に揺動可能に支持
した針棒揺動体１６と、針の揺動方向に長い針孔及び布
送り方向に沿う送り歯溝を形成した針板２８と、ミシン
機構に連動して四運動し送り歯溝から出没し布押えと共
同して布を送る送り歯２９と、ミシン機枠に回動可能に
支持しミシンの主軸に連動して基軸を中心に回動する複
数の模様カム群４と、模様カムの一つに選択的に係合可
能とし模様カムの回転によるカム面変化により揺動量が
変るように固定軸線を中心に揺動可能な追従子８と、追
従子の揺動に連動して揺動するとともに一側方に係合面
をもつ係合部及び揺動中心より離れる方向に伸びた脚部
を形成した揺動体１５と一端を針棒揺動体に連結し他端
に支持した係合体を揺動体の係合部に対向させた連動体
１８と、連動体に作用して係合体を揺動体の係合部に圧
接させ連動体を介して追従子を模様カム外周に圧接させ
る弾性体１７と、一端に接触部を形成し他端を連動体に
連結し固定軸線を中心に回動可能とした支持体１９と、
回動操作可能とし所定位置に回動したとき支持体の接触
部に係合し支持体を回動して連動体の係合体を揺動体の
揺動中心から離れた位置に移動する第１のカム面及び揺
動体の脚部に係合し揺動体を回動して追従子を模様カム
外周から隔離する方向に回動する第２のカム面とを形成
し直線縫い目が送り歯を通るように第１及び第２のカム
面により連動体を介して針棒揺動体を移動するカム体１
３とを設けた模様縫いミシンの直線縫い機構A needle bar oscillating body 16 supports a needle bar that moves up and down in conjunction with the main shaft of the sewing machine, and is supported so as to be swingable in a direction perpendicular to the cloth feeding direction with respect to the sewing machine frame, and a needle that is long in the direction of needle oscillation. A needle plate 28 having a hole and a feed dog groove along the cloth feeding direction, a feed dog 29 that moves in conjunction with the sewing machine mechanism and moves in and out of the feed dog groove to feed the cloth together with the presser foot, and a sewing machine frame. A plurality of pattern cam groups 4 that are rotatably supported and rotated around the base shaft in conjunction with the main shaft of the sewing machine, and a cam surface that can be selectively engaged with one of the pattern cams and change the cam surface by rotation of the pattern cam. a follower 8 that can swing around a fixed axis so that the amount of swing changes, an engagement part that swings in conjunction with the swing of the follower and has an engagement surface on one side, and a swing center. An oscillating body 15 having legs extending further apart, an interlocking body 18 having one end connected to the needle bar oscillating body and an engaging body supported at the other end facing the engaging portion of the oscillating body; An elastic body 17 that acts to press the engaging body against the engaging part of the rocking body and press the follower against the outer periphery of the pattern cam via the interlocking body, forms a contact part at one end, and connects and fixes the other end to the interlocking body. a support 19 rotatable around an axis;
A first element that can be rotated and, when rotated to a predetermined position, engages the contact portion of the support body, rotates the support body, and moves the engaging body of the interlocking body to a position away from the rocking center of the rocking body. A second cam surface that engages with the cam surface and the leg of the oscillator and rotates the oscillator in a direction to separate the follower from the outer periphery of the pattern cam is formed so that the straight seam passes through the feed dog. A cam body 1 that moves the needle bar rocking body via the interlocking body by the first and second cam surfaces.
3 Straight stitch mechanism of pattern stitch sewing machine