JP2009095575A - Multi-thread chain stitch sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multi-thread chain stitch sewing machine which enables sewing room operation by multiple needles using a vertically shaking looper, wherein a differential feed dog is included in order to correspond to the sewing room operation of extended or inelastic fabric. <P>SOLUTION: In the multi-thread chain stitch sewing machine which forms a seam by a vertically shaking looper 1 which can be engaged with needle thread by rocking around a looper shaft 6 in a back and forth direction almost parallel to a fabric feed direction in synchronization with the vertical motion of needle thread and a spreader 2 which hooks the lower thread of the vertically shaking looper 1 and brings it near a needle thread direction by both-way driving in right and left directions mostly perpendicular to a fabric feed direction in synchronization with the vertical motion of the needle thread, the differential feed dog 3 and a main feed dog 4, which are arranged before and behind a needle location, are arranged behind the vertically shaking looper 1. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、二重環縫いミシンに係り、より詳しくは、立振りルーパーを用いた二重環縫いミシンに、伸びる生地や伸びない生地に対応した縫製を可能にする差動送り歯を備えることに特徴を有する二重環縫いミシンに関する。   The present invention relates to a double chain stitch sewing machine, and more particularly, a double chain stitch sewing machine using a vertical swing looper is provided with a differential feed dog that enables sewing corresponding to a stretched fabric or a stretched fabric. The present invention relates to a double chain stitch sewing machine characterized by

二重環縫いミシンに用いられるルーパーには針糸の上下動に同期して、生地送り方向に対して左右方向に楕円運動を行って縫い目を作る横振りルーパーがある（例えば、特許文献１参照。）。横振りルーパーは生地送り方向に対して左右方向に楕円運動を行う機構上、主送り歯の前側に差動送り歯を取り付けることができ、差動送り歯と主送り歯の送り量を変化させることで、意図的に生地に伸ばしを掛けたり、縮みを掛けることが可能であって、伸びる生地と伸びない生地に対応させて縫製するに適している（例えば、特許文献２参照）。   A looper used in a double chain stitch sewing machine includes a horizontal looper that creates a seam by performing an elliptical motion in the left-right direction with respect to the fabric feed direction in synchronization with the vertical movement of the needle thread (see, for example, Patent Document 1). .) The horizontal swing looper has an elliptical motion in the left-right direction with respect to the material feed direction, so that a differential feed dog can be attached to the front side of the main feed dog, changing the feed amount of the differential feed dog and the main feed dog. Thus, the fabric can be intentionally stretched or shrunk, and is suitable for sewing according to the stretched fabric and the stretched fabric (for example, see Patent Document 2).

これに対し、生地送り方向に対して平行に前後運動する立振りルーパーがある。この立振りルーパーの前側にはスプレッダーが配置され、このスプレッダーが下糸を引っ掛けて縫い目を形成している（例えば、特許文献３参照）。立振りルーパーは多本針で縫製を可能にするという利点がある。   On the other hand, there is a vertical looper that moves back and forth in parallel with the dough feeding direction. A spreader is disposed on the front side of the vertical swing looper, and the spreader hooks a lower thread to form a seam (see, for example, Patent Document 3). The vertical swing looper has the advantage of allowing sewing with a multi-needle.

特開平８−１３１６８２号公報JP-A-8-131682 特開２００６−６８２６２号公報JP 2006-68262 A 特開２００６−３１４４２３号公報JP 2006-314423 A

しかしながら、立振りルーパーを用いる上記二重環縫いミシンでは、立振りルーパーが前後運動し、この立振りルーパーの前側にスプレッダーが配置されており、これら立振りルーパーおよびスプレッダーの配置周辺には空間的な余裕が乏しいため、伸びる生地と伸びない生地の縫製に対応すべく、差動送り歯を設置することが難しいという問題がある。前出の特許文献３に記載の、立振りルーパーを用いる二重環縫いミシンには差動送り歯、差動送り機構が付いていない。   However, in the double chain stitch sewing machine using the vertical swing looper, the vertical swing looper moves back and forth, and a spreader is disposed on the front side of the vertical swing looper, and there is a space around the arrangement of the vertical swing looper and the spreader. There is a problem that it is difficult to install a differential feed dog in order to cope with sewing of stretched fabric and stretched fabric. The double chain stitch sewing machine using the vertical swing looper described in Patent Document 3 is not provided with a differential feed dog and a differential feed mechanism.

本発明は、このような問題を解決するためになされたものであって、その目的とするところは、立振りルーパーを用いて多本針での縫製を可能にした二重環縫いミシンにおいて、差動送り歯を備え、伸びる生地や伸びない生地の縫製に対応できる二重環縫いミシンを提供することにある。   The present invention was made in order to solve such problems, and the object of the present invention is a double chain stitch sewing machine which enables sewing with a multi-needle using a vertical swing looper. An object of the present invention is to provide a double chain stitch sewing machine that has a differential feed dog and can be used to sew a stretched fabric or a stretched fabric.

本発明は、請求項１に記載のように、その発明の内容を理解し易くするために図１〜図１６に付した符号を参照して説明すると、針糸の上下運動と同期して、生地送り方向とほぼ平行な前後方向にルーパー軸（６）回りに揺動して針糸に係合し得る立振りルーパー（１）と、針糸の上下運動と同期して、生地送り方向とほぼ直交する左右方向に往復駆動して立振りルーパー（１）の下糸を引っ掛けて前記針糸方向に寄せるスプレッダー（２）とで縫い目を形成する二重環縫いミシンにおいて、立振りルーパー（１）の後方に、針落ち位置の前後に配した差動送り歯（３）および主送り歯（４）を設置していることに特徴を有するものである。
この構成によると、主送り歯（４）の前側に配する差動送り歯（３）は立振りルーパー（１）の後方に設置することで、立振りルーパー（１）やスプレッダー（２）に干渉するといった問題なく、コンパクトに納めることができる。 As described in claim 1, the present invention will be described with reference to the reference numerals attached to FIGS. 1 to 16 in order to facilitate understanding of the content of the invention. A swinging looper (1) that can swing around the looper shaft (6) in the front-rear direction substantially parallel to the cloth feeding direction and engage with the needle thread, and the cloth feeding direction in synchronization with the vertical movement of the needle thread. In a double chain stitch sewing machine that forms a seam with a spreader (2) that reciprocates in the left-right direction substantially orthogonal and hooks the lower thread of the vertical swing looper (1) and moves toward the needle thread direction, the vertical looper (1 ), A differential feed dog (3) and a main feed dog (4) arranged before and after the needle drop position are provided.
According to this configuration, the differential feed dog (3) disposed on the front side of the main feed dog (4) is disposed behind the vertical swing looper (1), so that the vertical swing looper (1) and the spreader (2) It can be stored compactly without the problem of interference.

請求項１記載の二重環縫いミシンは、請求項２に記載のように、主送り歯（４）が、主送り歯取付台（１５）から前方へ延出する主送り歯部材（１４）の上面に形成され、差動送り歯（３）が、差動送り歯取付台（１７）から前方へ延出する差動送り歯部材（１６）の先端寄り部（１６ｂ）のみの上面に形成され、主送り歯部材（１４）の下面側に差動送り歯部材（１６）の差動送り歯（３）より後方の歯無し部（１６ｃ）が前後方向に摺動可能に重ね合わされて、主送り歯取付台（１５）に対して差動送り歯取付台（１７）が平行に前後方向にスライド自在に一体的に組み合わされた構成を採用することができる。
このような構成によると、主送り歯（４）および差動送り歯（３）の厚みを確保できて強度アップを図ることができ、そのうえ、立振りルーパー（１）の後方の制約されたスペース内に、主送り歯（４）と差動送り歯（３）をコンパクトに配備することができるため、環縫いミシンの大型化を避けることができる。 The double chain stitch sewing machine according to claim 1 has a main feed dog member (14) in which the main feed dog (4) extends forward from the main feed dog mount (15). The differential feed dog (3) is formed only on the top surface of the differential feed dog member (16) near the tip (16b) extending forward from the differential feed dog mounting base (17). The toothless portion (16c) behind the differential feed dog (3) of the differential feed dog member (16) is slidably overlapped on the lower surface side of the main feed dog member (14) so as to be slidable in the front-rear direction. A configuration in which the differential feed dog mounting base (17) is integrally combined with the main feed dog mounting base (15) so as to be slidable in the front-rear direction can be employed.
According to such a configuration, the thickness of the main feed dog (4) and the differential feed dog (3) can be ensured and the strength can be increased, and furthermore, the restricted space behind the vertical swing looper (1). Since the main feed dog (4) and the differential feed dog (3) can be provided in a compact manner, an enlargement of the chain stitch sewing machine can be avoided.

請求項２記載の二重環縫いミシンは、請求項３に記載のように、差動送り歯（３）及び主送り歯（４）に前後運動及び上下運動を行わせる差動送り機構（５）と、差動送り歯（３）の前後動作量を変更する差動送り調節機構（３３）とを備えた構成を採用することができる。   The double chain stitch sewing machine according to claim 2 is a differential feed mechanism (5) that causes the differential feed dog (3) and the main feed dog (4) to move back and forth and up and down as described in claim 3. ) And a differential feed adjustment mechanism (33) for changing the front-rear movement amount of the differential feed dog (3).

請求項３記載の二重環縫いミシンは、請求項４に記載のように、差動送り機構（５）は、生地送り方向とほぼ直交する左右方向に架設された主軸（１０）および送り軸（１１）と、主軸（１０）の揺動を主軸（１０）に固着した主送り偏心カム（１２）に嵌着した主送りレバー（１３）を介して送り軸（１１）に伝達する伝動機構とを備え、差動送り歯取付台（１７）と一体的に組み合わされた主送り歯取付台（１５）を、送り軸（１１）上に固定された送り元台（２６）に、主送り歯取付台（１５）に一体的に結合された送り土台（２８）の一端部を枢軸（２９）を介して枢支連結し、その送り土台（２８）の他端部を、主軸（１０）に固着した送り上下偏心カム（３０）に嵌着した送りロッド（３１）にピン（３２）を介して枢支連結しており、送り軸（１１）の揺動に伴い送り元台（２６）が送り軸（１１）回りに前後揺動し、この送り元台（２６）の前後揺動により送り土台（２８）を介して主送り歯取付台（１５）および主送り歯（４）は差動送り歯取付台（１７）および差動送り歯（３）と共に前後に運動し、一方、主軸（１０）の回転により送り上下偏心カム（３０）と送り土台（２８）を介して、主送り歯取付台（１５）および主送り歯（４）は差動送り歯取付台（１７）および差動送り歯（３）と共に上下に運動することにより、主送り歯（４）および差動送り歯（３）はこれらの前後運動と上下運動の合成により楕円運動を行うようにした構成を採用することができる。
この構成の差動送り機構（５）によると、差動送り歯（３）及び主送り歯（４）に前後運動及び上下運動を確実に行わせることができ、これらの前後運動と上下運動の合成により楕円運動を保証できる。 In the double chain stitch sewing machine according to claim 3, the differential feed mechanism (5) includes the main shaft (10) and the feed shaft that are installed in the left-right direction substantially orthogonal to the cloth feed direction. (11) and a transmission mechanism for transmitting the swing of the main shaft (10) to the feed shaft (11) via the main feed lever (13) fitted to the main feed eccentric cam (12) fixed to the main shaft (10). The main feed dog mounting base (15) integrally combined with the differential feed dog mounting base (17) is connected to the feed base (26) fixed on the feed shaft (11). One end of a feed base (28) integrally coupled to the tooth mounting base (15) is pivotally connected via a pivot (29), and the other end of the feed base (28) is connected to the main shaft (10). The feed rod (31) fitted to the feed up / down eccentric cam (30) fixed to the shaft is pivotally connected via a pin (32). As the feed shaft (11) swings, the feed base (26) swings back and forth around the feed shaft (11), and the feed base (26) swings back and forth via the feed base (28). The main feed dog mounting base (15) and the main feed dog (4) move back and forth together with the differential feed dog mounting base (17) and the differential feed dog (3), while feeding by the rotation of the main shaft (10). The main feed dog mounting base (15) and the main feed dog (4) together with the differential feed dog mounting base (17) and the differential feed dog (3) via the vertical eccentric cam (30) and the feed base (28). By moving up and down, it is possible to adopt a configuration in which the main feed dog (4) and the differential feed dog (3) perform an elliptical motion by combining these back-and-forth motion and vertical motion.
According to the differential feed mechanism (5) of this configuration, the differential feed dog (3) and the main feed dog (4) can reliably perform the back-and-forth motion and the up-and-down motion. Elliptic motion can be guaranteed by synthesis.

請求項４記載の二重環縫いミシンは、請求項５に記載のように、差動送り調節機構（３３）は、送り軸（１１）に、上端側に円弧溝（３４）を有する差動調節レバー（３５）を装備し、この差動調節レバー（３５）の円弧溝（３４）に差動調節ピン（３７）の一端側に設けた雄ねじ部（３７ａ）を挿通し、円弧溝（３４）より突出する雄ねじ部（３７ａ）の先端にナット（４１）を締め付け、差動調節ピン（３７）の他端部（３７ｂ）は差動送り連結リンク（３８）の下端部に結合し、差動送り連結リンク（３８）の上端部は、差動送り歯取付台（１７）に枢軸（４０）で枢支連結した構成を採用することができる。
この構成の差動送り調節機構（３３）によれば、差動調節ピン（３７）の雄ねじ部（３７ａ）に螺合させたナット（４１）をナット回し用工具で緩めて差動調節ピン（３７）の円弧溝（３４）内での位置を変更することにより、差動送り歯（３）の前後方向の送り量を簡単かつ確実に調節することができる。 According to a fourth aspect of the present invention, in the double chain stitch sewing machine, the differential feed adjustment mechanism (33) has a differential having an arc groove (34) on the upper end side of the feed shaft (11). An adjustment lever (35) is provided, and a male thread portion (37a) provided on one end side of the differential adjustment pin (37) is inserted into the arc groove (34) of the differential adjustment lever (35), so that the arc groove (34 ) The nut (41) is fastened to the tip of the male screw portion (37a) protruding from the other end, and the other end portion (37b) of the differential adjustment pin (37) is coupled to the lower end portion of the differential feed connection link (38). The upper end part of the dynamic feed connecting link (38) can adopt a configuration in which the differential feed dog mount (17) is pivotally connected by the pivot (40).
According to the differential feed adjustment mechanism (33) of this configuration, the nut (41) screwed into the male screw portion (37a) of the differential adjustment pin (37) is loosened with a nut turning tool, and the differential adjustment pin ( By changing the position of 37) in the arc groove (34), the feed amount in the front-rear direction of the differential feed dog (3) can be easily and reliably adjusted.

請求項４記載の二重環縫いミシンは、請求項６に記載のように、差動送り調節機構（３３）は、送り軸（１１）に差動調節レバー（４３）を装備し、差動調節レバー（４３）の上端側腕部（４３ａ）にスライダ（４４）を装着し、このスライダ（４４）を差動送り連結リンク（３８）の下端部に第１差動調節リンク（４５）の上端部を介して連結し、差動送り連結リンク（３８）の上端部を差動送り歯取付台（１７）に枢軸（４０）を介して枢支連結し、スライダ（４４）は、第１差動調節リンク（４５）、この第１差動調節リンク（４５）の下端部に差動調節ピン（４６）で連結される第２差動調節リンク（４７）を介して、送り軸（１１）と平行な差動レバー軸（４８）の一端部に連結し、差動レバー軸（４８）の他端部には外部操作レバー（４２）を固定した構成を採用することができる。
この構成の差動送り調節機構（３３）によれば、外部操作レバー（４２）によって差動送り歯（３）の前後方向の送り量を簡単かつ確実に調節することができる。 In the double chain stitch sewing machine according to claim 4, the differential feed adjustment mechanism (33) is equipped with a differential adjustment lever (43) on the feed shaft (11), and the differential feed adjustment mechanism (33) is provided. The slider (44) is mounted on the upper end side arm portion (43a) of the adjusting lever (43), and this slider (44) is attached to the lower end portion of the differential feed connecting link (38) of the first differential adjusting link (45). The upper end of the differential feed connection link (38) is pivotally connected to the differential feed dog mounting base (17) via the pivot (40), and the slider (44) is connected to the first end. The differential adjustment link (45) and the feed shaft (11) via the second differential adjustment link (47) connected to the lower end of the first differential adjustment link (45) by a differential adjustment pin (46). ) Is connected to one end of the differential lever shaft (48) parallel to the other end of the differential lever shaft (48). It can be employed fixed configure chromatography (42).
According to the differential feed adjustment mechanism (33) having this configuration, the feed amount in the front-rear direction of the differential feed dog (3) can be easily and reliably adjusted by the external operation lever (42).

本発明によれば、立振りルーパーを用いて多本針での縫製を可能にした二重環縫いミシンにおいても伸びる生地や伸びない生地の縫製によく対応できるという利点がある。   According to the present invention, there is an advantage that even a double chain stitch sewing machine that can be sewn with a multi-needle using a vertical swing looper can cope with sewing of stretched fabric and fabric that does not stretch.

本発明の好適な実施形態を図面に基づき説明する。図１は本発明の一実施例の二重環縫いミシンの立振りルーパー、スプレッダー、および差動送り機構を、立振りルーパーを前方向に揺動させた状態で示す側面図、図２は同二重環縫いミシンの立振りルーパー、スプレッダー、および差動送り機構を、立振りルーパーを後方向に揺動させた状態で示す側面図、図３は差動送り機構および差動送り調節機構を後ろ側から見た斜視図、図４は差動送り機構の要部を前側から見た斜視図、図５は差動送り機構および差動送り調節機構の要部を後ろ側から見た斜視図、図６は図５の差動送り機構および差動送り調節機構の要部を後ろ側から見た分解斜視図、図７は主送り歯と差動送り歯を組み合わせた状態の斜視図、図８は主送り歯と差動送り歯を組み合わせた状態の平面図、図９は主送り歯と差動送り歯を組み合わせた状態の正面図、図１０は主送り歯と差動送り歯を組み合わせた状態の左側面図、図１１は主送り歯と差動送り歯を組み合わせた状態の右側面図、図１２は主送り歯の斜視図、図１３は主送り歯と差動送り歯の分解斜視図、図１４は主送り歯、差動送り歯および差動送り機構の縦断側面図、図１５は他の実施例を図５に相応して示す斜視図、図１６は他の実施例を図６に相応して示す分解斜視図である。   A preferred embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side view showing a vertical looper, a spreader, and a differential feed mechanism of a double chain stitch sewing machine according to an embodiment of the present invention in a state where the vertical looper is swung forward, and FIG. FIG. 3 is a side view showing the vertical swing looper, spreader, and differential feed mechanism of the double chain stitch sewing machine in a state where the vertical swing looper is swung backward, and FIG. 3 shows the differential feed mechanism and the differential feed adjustment mechanism. FIG. 4 is a perspective view of the main part of the differential feed mechanism viewed from the front side, and FIG. 5 is a perspective view of the main part of the differential feed mechanism and the differential feed adjustment mechanism viewed from the rear side. 6 is an exploded perspective view of the essential parts of the differential feed mechanism and the differential feed adjustment mechanism of FIG. 5 viewed from the rear side, and FIG. 7 is a perspective view of a state in which the main feed dog and the differential feed dog are combined. 8 is a plan view of the main feed dog and the differential feed dog combined, and FIG. 9 is the main feed dog and the differential feed dog. FIG. 10 is a left side view of a state where the main feed dog and the differential feed dog are combined, FIG. 11 is a right side view of a state where the main feed dog and the differential feed dog are combined, FIG. 12 is a perspective view of the main feed dog, FIG. 13 is an exploded perspective view of the main feed dog and the differential feed dog, FIG. 14 is a longitudinal side view of the main feed dog, the differential feed dog and the differential feed mechanism, and FIG. 5 is a perspective view corresponding to FIG. 5, and FIG. 16 is an exploded perspective view corresponding to FIG.

図１、図２において、本発明の一実施例を示す二重環縫いミシンは、立振りルーパー１とスプレッダー２を備え、立振りルーパー１の後方に、針落ち位置の前後に配した差動送り歯３および主送り歯４を設置するとともに、差動送り歯３及び主送り歯４に送り動作（前後動及び上下動）を行わせる差動送り機構５を備えている。   1 and 2, a double chain stitch sewing machine according to an embodiment of the present invention includes a vertical swing looper 1 and a spreader 2, and is arranged behind the vertical swing looper 1 and before and after the needle drop position. The feed dog 3 and the main feed dog 4 are installed, and a differential feed mechanism 5 for causing the differential feed dog 3 and the main feed dog 4 to perform feed operations (back and forth movement and vertical movement) is provided.

立振りルーパー１は、複数本の縫針（図示せず）の上下運動と同期して、生地送り方向とほぼ平行な前後方向Ｆにルーパー軸６回りに揺動して針糸（図示せず）に係合し得るものであって、図外の周知のルーパー駆動機構により軸線回りに前後方向に揺動可能なルーパー軸６の左端側に嵌挿されたルーパー台７の上面に、左右方向に複数本並べて固定されている。   The vertical swing looper 1 swings around the looper shaft 6 in the front-rear direction F substantially parallel to the cloth feeding direction in synchronization with the vertical movement of a plurality of sewing needles (not shown), and a needle thread (not shown). On the upper surface of the looper base 7 fitted on the left end side of the looper shaft 6 which can be swung back and forth around the axis by a well-known looper driving mechanism (not shown). Multiple books are fixed side by side.

スプレッダー２は、複数本の縫針（図示せず）の上下運動と同期して、生地送り方向とほぼ直交する左右方向に往復駆動して立振りルーパー１の下糸（図示せず）を引っ掛けて針糸方向に寄せるものであって、スプレッダー２は、糸引掛け用爪２ａを有し、図外のスプレッダー駆動機構により生地送り方向と直交する左右方向に往復運動可能なスプレッダー軸８の左端部に取り付けられている。   The spreader 2 is driven to reciprocate in the left-right direction substantially perpendicular to the cloth feed direction in synchronization with the vertical movement of a plurality of sewing needles (not shown) to hook the lower thread (not shown) of the vertical swing looper 1. The spreader 2 has a thread hooking claw 2a and is arranged at the left end portion of the spreader shaft 8 that can reciprocate in the left-right direction perpendicular to the cloth feeding direction by a spreader drive mechanism (not shown). It is attached.

次に、主送り歯４、差動送り歯３、および差動送り機構５について説明する。   Next, the main feed dog 4, the differential feed dog 3, and the differential feed mechanism 5 will be described.

図３、図４に示すように、ミシンベッド（図示せず）の内部に、ミシンモータ（図示せず）からの伝動によりプーリ9を介して軸心回りに揺動する主軸１０を左右方向に架設するとともに、主軸１０と平行に送り軸１１を架設する。主軸１０の回転は、主軸１０に固着した主送り偏心カム１２に嵌着した主送りレバー１３による伝動機構を介して送り軸１１に伝動され、送り軸１１は軸心回りに揺動する。なお、主軸１０が回転すると、主送り偏心カム１２に嵌着された主送りレバー１３には主送り偏心カム１２の偏心量に応じたストロークの往復動が生じる。   As shown in FIGS. 3 and 4, a main shaft 10 that swings around a shaft center through a pulley 9 by a transmission from a sewing machine motor (not shown) is set in a horizontal direction in a sewing machine bed (not shown). The feed shaft 11 is installed in parallel with the main shaft 10 while being installed. The rotation of the main shaft 10 is transmitted to the feed shaft 11 through a transmission mechanism by a main feed lever 13 fitted to a main feed eccentric cam 12 fixed to the main shaft 10, and the feed shaft 11 swings around the shaft center. When the main shaft 10 rotates, the main feed lever 13 fitted to the main feed eccentric cam 12 undergoes a reciprocating motion with a stroke corresponding to the amount of eccentricity of the main feed eccentric cam 12.

主送り歯４および差動送り歯３について、図７ないし図１１に示すように、主送り歯４を有する主送り歯部材１４を支持する主送り歯取付台１５と、差動送り歯３を有する差動送り歯部材１６を支持する差動送り歯取付台１７とは一体的に組み合わされる。
主送り歯部材１４は、図１２、図１３に示すように、主送り歯取付台１５に取付ねじ１８で固定される後方基端部１４ａから前方へ延出するフォーク形状に形成され、この主送り歯部材１４の上面に主送り歯４を形成する。一方、差動送り歯部材１６は、図７ないし図１１、図１３に示すように、差動送り歯取付台１７に取付ねじ１９で固定される後方基端部１６ａから前方へ延出するフォーク形状に形成され、この差動送り歯部材１６の先端寄り部１６ｂのみの上面に差動送り歯３を形成する。 As shown in FIGS. 7 to 11, the main feed dog 4 and the differential feed dog 3 include a main feed dog mounting base 15 that supports the main feed dog member 14 having the main feed dog 4 and the differential feed dog 3. The differential feed dog mounting base 17 that supports the differential feed dog member 16 is integrally combined.
As shown in FIGS. 12 and 13, the main feed dog member 14 is formed in a fork shape extending forward from a rear base end portion 14 a fixed to the main feed dog mounting base 15 with a mounting screw 18. The main feed dog 4 is formed on the upper surface of the feed dog member 14. On the other hand, as shown in FIGS. 7 to 11 and 13, the differential feed dog member 16 is a fork extending forward from a rear base end portion 16a fixed to the differential feed dog mounting base 17 with a mounting screw 19. The differential feed dog 3 is formed on the upper surface of the differential feed dog member 16 only at the tip end portion 16b.

そして、主送り歯取付台１５と差動送り歯取付台１７とは、図７ないし図１１、図１３に示すように、差動送り歯取付台１７の左右方向一端側から後方へ突出したピン２０を主送り歯取付台１５の取付孔２１内に嵌め込まれたブッシュ２２に、また差動送り歯取付台１７の左右方向他端側から後方へ突設したガイド２３を主送り歯取付台１５に止めねじ２４で固定した上下一対の溝形ガイド受け２５，２５間にそれぞれ前後方向に摺動自在に嵌合させる。これにより主送り歯取付台１５と差動送り歯取付台１７とは、主送り歯部材１４の下面側に差動送り歯部材１６の差動送り歯３より後方の歯無し部１６ｃが前後方向に摺動可能に重ね合わされるように、主送り歯取付台１５に対して差動送り歯取付台１７が平行に前後方向にスライド自在に一体的に組み合わされる。このように主送り歯取付台１５に対して差動送り歯取付台１７を一体的に組み合わせることで、主送り歯４および差動送り歯３の厚みを確保できて強度アップを図ることができ、しかも立振りルーパー１の後方の制約されたスペース内に、主送り歯４と差動送り歯３をコンパクトに配備することが可能になる。   The main feed dog mounting base 15 and the differential feed dog mounting base 17 are, as shown in FIGS. 7 to 11 and 13, a pin protruding backward from one end in the left-right direction of the differential feed dog mounting base 17. 20 is inserted into the bush 22 fitted in the mounting hole 21 of the main feed dog mounting base 15, and the guide 23 projecting rearward from the other end in the left-right direction of the differential feed dog mounting base 17 is connected to the main feed dog mounting base 15. And a pair of upper and lower groove-shaped guide receivers 25, 25 fixed by a set screw 24, respectively, are slidably fitted in the front-rear direction. Accordingly, the main feed dog mounting base 15 and the differential feed dog mounting base 17 are configured so that the toothless portion 16c behind the differential feed dog 3 of the differential feed dog member 16 on the lower surface side of the main feed dog member 14 is in the front-rear direction. The differential feed dog mounting base 17 is integrally combined with the main feed dog mounting base 15 so as to be slidable in the front-rear direction. Thus, by integrally combining the differential feed dog mounting base 17 with the main feed dog mounting base 15, the thickness of the main feed dog 4 and the differential feed dog 3 can be secured, and the strength can be increased. In addition, the main feed dog 4 and the differential feed dog 3 can be arranged in a compact manner in a limited space behind the vertical swing looper 1.

主送り歯４と一体的に組み合わされた差動送り歯３は、針落ち位置において、図１に示すように、主送り歯４の前側でかつ立振りルーパー１の後方に、該立振りルーパー１と干渉することのないように設置される。主送り歯４の前側に配する差動送り歯３は立振りルーパー１の後方に設置することで、立振りルーパー１やスプレッダー２に干渉するといった問題なく、コンパクトに納めることができる。   As shown in FIG. 1, the differential feed dog 3 integrally combined with the main feed dog 4 is located on the front side of the main feed dog 4 and behind the vertical swing looper 1 as shown in FIG. 1 is installed so as not to interfere with 1. The differential feed dog 3 disposed on the front side of the main feed dog 4 can be accommodated in a compact manner without the problem of interfering with the vertical swing looper 1 and the spreader 2 by being installed behind the vertical swing looper 1.

差動送り機構５は、図１、図５、図１４に示すように、差動送り歯取付台１７と一体的に組み合わされた主送り歯取付台１５を、送り軸１１上に固定された送り元台２６に、主送り歯取付台１５に取付ピン２７で一体的に結合された「く」の字形状の送り土台２８の一端のボス部（屈曲部）２８ａを枢軸２９を介して枢支連結し、その送り土台２８の他端のボス部２８ｂを主軸１０に固着した送り上下偏心カム３０に嵌着した送りロッド３１にピン３２を介して枢支連結する。かくして、送り軸１１の揺動に伴い送り元台２６が送り軸１１回りに前後揺動し、この送り元台２６の前後揺動により送り土台２８を介して主送り歯取付台１５および主送り歯４は差動送り歯取付台１７および差動送り歯３と共に前後に運動する。一方、主軸１０の回転により送り上下偏心カム３０と送り土台２８を介して、主送り歯取付台１５および主送り歯４は差動送り歯取付台１７および差動送り歯３と共に上下に運動する。主送り歯４および差動送り歯３はこれらの前後運動と上下運動の合成により楕円運動を行い、針落ち位置に供給される縫製生地に、縫針（図示せず）の上下動に対応した間欠的な送りが加えられることになる。
このように構成された差動送り機構５によれば、送り元台２６、送り土台２８および送り上下偏心カム３０に嵌着した送りロッド３１により差動送り歯３及び主送り歯４に前後運動及び上下運動を確実に行わせることができ、これらの前後運動と上下運動の合成により楕円運動を保証できる。 As shown in FIGS. 1, 5, and 14, the differential feed mechanism 5 has a main feed dog mounting base 15 integrally combined with the differential feed dog mounting base 17 fixed on the feed shaft 11. A boss portion (bent portion) 28 a at one end of a “<”-shaped feed base 28 integrally connected to the main feed dog mounting base 15 by a mounting pin 27 is pivoted to the feed base 26 via a pivot 29. The boss portion 28 b at the other end of the feed base 28 is pivotally connected via a pin 32 to a feed rod 31 fitted to a feed vertical eccentric cam 30 fixed to the main shaft 10. Thus, as the feed shaft 11 swings, the feed base 26 swings back and forth around the feed shaft 11, and the feed feed base 26 and the main feed dog mounting base 15 and the main feed are moved through the feed base 28 by swinging back and forth of the feed base 26. The teeth 4 move back and forth with the differential feed dog mount 17 and the differential feed teeth 3. On the other hand, the main feed dog mounting base 15 and the main feed dog 4 move up and down together with the differential feed dog mounting base 17 and the differential feed dog 3 through the feed vertical eccentric cam 30 and the feed base 28 by the rotation of the main shaft 10. . The main feed dog 4 and the differential feed dog 3 perform an elliptical motion by combining these back-and-forth motions and up-and-down motions. Will be added.
According to the differential feed mechanism 5 configured as described above, the differential feed dog 3 and the main feed dog 4 are moved back and forth by the feed rod 31 fitted to the feed base 26, the feed base 28, and the feed vertical eccentric cam 30. In addition, the vertical motion can be surely performed, and the elliptical motion can be guaranteed by the combination of the longitudinal motion and the vertical motion.

次に、差動送り歯３の前後動作量を変更するための差動送り調節機構３３について説明する。   Next, the differential feed adjustment mechanism 33 for changing the front-rear movement amount of the differential feed dog 3 will be described.

図５、図６に示すように、送り軸１１に、上端側に円弧溝３４を有する差動調節レバー３５が装備される。この差動調節レバー３５の円弧溝３４には差動調節ピン３７の一端側に設けた雄ねじ部３７ａを挿通し、円弧溝３４より突出する雄ねじ部３７ａの先端にナット４１をワッシャー４１ａを介して締め付けて固定する。差動調節ピン３７の他端部３７ｂは差動送り連結リンク３８の下端側のボス部３８ａに挿通結合する。差動送り連結リンク３８の上端側のボス部３８ｂは、差動送り歯取付台１７にピン２０と平行に後方へ突設した腕部３９に枢軸４０で枢支連結する。しかるときは、ナット４１をナット回し用工具で緩めて差動調節ピン３７の円弧溝３４内での位置を変更することにより、差動調節レバー３５と差動送り連結リンク３８の連結位置が変更される。この変更により差動送り歯３の前後方向の運動量（送り量）を調節することができる。よって、主送り歯４の前後動作量と差動送り歯３の前後動作量との差を比率にした差動比を変更できる。
このように、差動調節ピン３７の雄ねじ部３７ａに螺合させたナット４１をナット回し用工具で緩めて差動調節ピン３７の円弧溝３４内での位置を変更するという簡単な操作で、差動送り歯３の前後方向の送り量を確実に調節することができる。 As shown in FIGS. 5 and 6, the feed shaft 11 is equipped with a differential adjustment lever 35 having an arc groove 34 on the upper end side. A male threaded portion 37a provided on one end side of the differential adjusting pin 37 is inserted into the circular arc groove 34 of the differential adjusting lever 35, and a nut 41 is inserted through a washer 41a at the tip of the male threaded part 37a protruding from the circular arc groove 34. Tighten and fix. The other end portion 37 b of the differential adjustment pin 37 is inserted and coupled to a boss portion 38 a on the lower end side of the differential feed connection link 38. A boss portion 38 b on the upper end side of the differential feed connection link 38 is pivotally connected to an arm portion 39 projecting rearward from the differential feed dog mounting base 17 in parallel with the pin 20 by a pivot 40. In this case, the connection position of the differential adjustment lever 35 and the differential feed connection link 38 is changed by loosening the nut 41 with a nut turning tool and changing the position of the differential adjustment pin 37 in the arc groove 34. Is done. By this change, the amount of movement (feed amount) in the front-rear direction of the differential feed dog 3 can be adjusted. Therefore, the differential ratio obtained by setting the difference between the front-rear movement amount of the main feed dog 4 and the front-rear movement amount of the differential feed dog 3 as a ratio can be changed.
In this way, the nut 41 screwed into the male thread portion 37a of the differential adjustment pin 37 is loosened with a nut turning tool to change the position of the differential adjustment pin 37 in the arc groove 34. The feed amount in the front-rear direction of the differential feed dog 3 can be adjusted reliably.

工具でナット４１を緩めて差動送り歯３の前後動作量を変更する上記実施例に代えて、図１５に示すように環縫いミシンの外部に取り付けた外部操作レバー４２により差動送り歯３の前後動作量を変更することもできる。
すなわち、図１５、図１６に示すように、送り軸１１に差動調節レバー４３を送り元台２６に並べて装備する。差動調節レバー４３の上端側腕部４３ａにはスライダ４４が装着される。このスライダ４４は、差動送り連結リンク３８の下端側のボス部３８ａに第１差動調節リンク４５の上端部を介して連結される。差動送り連結リンク３８の上端側のボス部３８ｂは差動送り歯取付台１７の腕部３９に枢軸４０を介して枢支連結される。またスライダ４４は、第１差動調節リンク４５、この第１差動調節リンク４５の下端部に差動調節ピン４６で連結される第２差動調節リンク４７を介して、送り軸１１と平行に配備される差動レバー軸４８の一端部４８ａに連結される。差動レバー軸４８の他端部４８ｂには外部操作レバー４２が固定される。しかるときは、外部操作レバー４２で差動レバー軸４８を回動させて所定角度位置で停止させると、差動調節レバー４３と差動送り連結リンク３８との連結位置が変更される。この連結位置の変更により、差動送り歯３の前後方向の送り量を調節することができる。
このように、外部操作レバー４２によって差動レバー軸４８を所定角度に回動させるという簡単な操作で、差動送り歯３の前後方向の送り量を確実に調節することができる。 In place of the above-described embodiment in which the nut 41 is loosened with a tool to change the amount of forward / backward movement of the differential feed dog 3, the differential feed dog 3 is attached by an external operation lever 42 attached to the outside of the chain stitch machine as shown in FIG. It is also possible to change the amount of forward and backward movement.
That is, as shown in FIGS. 15 and 16, the feed shaft 11 is equipped with the differential adjustment lever 43 side by side on the feed base 26. A slider 44 is attached to the upper end side arm portion 43 a of the differential adjustment lever 43. The slider 44 is connected to the boss portion 38 a on the lower end side of the differential feed connection link 38 via the upper end portion of the first differential adjustment link 45. A boss portion 38b on the upper end side of the differential feed connecting link 38 is pivotally connected to an arm portion 39 of the differential feed dog mounting base 17 via a pivot 40. The slider 44 is parallel to the feed shaft 11 via a first differential adjustment link 45 and a second differential adjustment link 47 connected to a lower end portion of the first differential adjustment link 45 by a differential adjustment pin 46. Are connected to one end portion 48a of the differential lever shaft 48. An external operation lever 42 is fixed to the other end 48 b of the differential lever shaft 48. In this case, when the differential lever shaft 48 is rotated by the external operation lever 42 and stopped at a predetermined angular position, the connection position between the differential adjustment lever 43 and the differential feed connection link 38 is changed. By changing the coupling position, the feed amount in the front-rear direction of the differential feed dog 3 can be adjusted.
As described above, the feed amount in the front-rear direction of the differential feed dog 3 can be reliably adjusted by a simple operation of rotating the differential lever shaft 48 to a predetermined angle by the external operation lever 42.

本発明の一実施例の二重環縫いミシンの立振りルーパー、スプレッダー、および差動送り機構を、立振りルーパーを前方向に揺動させた状態で示す側面図である。It is a side view which shows the swinging looper of the double chain stitch sewing machine of one Example of this invention, a spreader, and the differential feed mechanism in the state which rocked the standing swing looper to the front. 同二重環縫いミシンの立振りルーパー、スプレッダー、および差動送り機構を、立振りルーパーを後方向に揺動させた状態で示す側面図である。FIG. 5 is a side view showing the vertical swing looper, spreader, and differential feed mechanism of the double chain stitch sewing machine in a state where the vertical swing looper is swung backward. 差動送り機構および差動送り調節機構を後ろ側から見た斜視図である。It is the perspective view which looked at the differential feed mechanism and the differential feed adjustment mechanism from the back side. 差動送り機構の要部を前側から見た斜視図である。It is the perspective view which looked at the principal part of the differential feeding mechanism from the front side. 差動送り機構および差動送り調節機構の要部を後ろ側から見た斜視図である。It is the perspective view which looked at the principal part of the differential feed mechanism and the differential feed adjustment mechanism from the back side. 図５の差動送り機構および差動送り調節機構の要部を後ろ側から見た分解斜視図である。It is the disassembled perspective view which looked at the principal part of the differential feed mechanism and differential feed adjustment mechanism of Drawing 5 from the back side. 主送り歯と差動送り歯を組み合わせた状態の斜視図である。It is a perspective view of the state which combined the main feed dog and the differential feed dog. 主送り歯と差動送り歯を組み合わせた状態の平面図である。It is a top view of the state which combined the main feed dog and the differential feed dog. 主送り歯と差動送り歯を組み合わせた状態の正面図である。It is a front view of the state which combined the main feed dog and the differential feed dog. 主送り歯と差動送り歯を組み合わせた状態の左側面図である。It is a left view of the state which combined the main feed dog and the differential feed dog. 主送り歯と差動送り歯を組み合わせた状態の右側面図である。It is a right view of the state which combined the main feed dog and the differential feed dog. 主送り歯の斜視図である。It is a perspective view of a main feed dog. 主送り歯と差動送り歯の分解斜視図である。It is a disassembled perspective view of a main feed dog and a differential feed dog. 主送り歯、差動送り歯および差動送り機構の縦断側面図である。It is a vertical side view of a main feed dog, a differential feed dog, and a differential feed mechanism. 他の実施例を図５に相応して示す斜視図である。FIG. 6 is a perspective view showing another embodiment corresponding to FIG. 5. 他の実施例を図６に相応して示す分解斜視図である。It is a disassembled perspective view which shows another Example corresponding to FIG.

符号の説明Explanation of symbols

１ 立振りルーパー
２ スプレッダー
３ 差動送り歯
４ 主送り歯
５ 差動送り機構
６ ルーパー軸
１０ 主軸
１１ 送り軸
１２ 主送り偏心カム
１３ 主送りレバー
１４ 主送り歯部材
１５ 主送り歯取付台
１６ 差動送り歯部材
１７ 差動送り歯取付台
２６ 送り元台
２８ 送り土台
２９ 枢軸
３０ 送り上下偏心カム
３１ 送りロッド
３２ ピン
３３ 差動送り調節機構
３４ 円弧溝
３５ 差動調節レバー
３６ ビス
３７ 差動調節ピン
３８ 差動送り連結リンク
４０ 枢軸
４１ ナット
４２ 外部操作レバー
４３ 差動調節レバー
４４ スライダー
４５ 第１差動調節リンク
４６ 差動調節ピン
４７ 第２差動調節リンク
４８ 差動レバー軸 DESCRIPTION OF SYMBOLS 1 Standing looper 2 Spreader 3 Differential feed dog 4 Main feed dog 5 Differential feed mechanism 6 Looper shaft 10 Main shaft 11 Feed shaft 12 Main feed eccentric cam 13 Main feed lever 14 Main feed dog member 15 Main feed dog mounting base 16 Difference Dynamic feed dog member 17 Differential feed dog mounting base 26 Feed base 28 Feed base 29 Axis 30 Feed vertical eccentric cam 31 Feed rod 32 Pin 33 Differential feed adjustment mechanism 34 Arc groove 35 Differential adjustment lever 36 Screw 37 Differential adjustment Pin 38 Differential feed connection link 40 Axis 41 Nut 42 External operation lever 43 Differential adjustment lever 44 Slider 45 First differential adjustment link 46 Differential adjustment pin 47 Second differential adjustment link 48 Differential lever shaft

Claims (6)

針糸の上下運動と同期して、生地送り方向とほぼ平行な前後方向にルーパー軸（６）回りに揺動して針糸に係合し得る立振りルーパー（１）と、針糸の上下運動と同期して、生地送り方向とほぼ直交する左右方向に往復駆動して立振りルーパー（１）の下糸を引っ掛けて前記針糸方向に寄せるスプレッダー（２）とで縫い目を形成する二重環縫いミシンにおいて、立振りルーパー（１）の後方に、針落ち位置の前後に配した差動送り歯（３）および主送り歯（４）を設置していることを特徴とする二重環縫いミシン。   Synchronized with the vertical movement of the needle thread, the swinging looper (1) that can swing around the looper shaft (6) in the front-rear direction substantially parallel to the cloth feed direction and engage with the needle thread, and the vertical movement of the needle thread Synchronously with the movement, a double stitch forming a seam with a spreader (2) that reciprocates in the left-right direction substantially perpendicular to the fabric feed direction and hooks the lower thread of the vertical looper (1) and moves it toward the needle thread direction. In the chain stitch sewing machine, a double ring characterized in that a differential feed dog (3) and a main feed dog (4) arranged before and after the needle drop position are installed behind the vertical swing looper (1). Sewing machine. 請求項１記載の二重環縫いミシンにおいて、主送り歯（４）が、主送り歯取付台（１５）から前方へ延出する主送り歯部材（１４）の上面に形成され、差動送り歯（３）が、差動送り歯取付台（１７）から前方へ延出する差動送り歯部材（１６）の先端寄り部（１６ｂ）のみの上面に形成され、主送り歯部材（１４）の下面側に差動送り歯部材（１６）の差動送り歯（３）より後方の歯無し部（１６ｃ）が前後方向に摺動可能に重ね合わされて、主送り歯取付台（１５）に対して差動送り歯取付台（１７）が平行に前後方向にスライド自在に一体的に組み合わされていることを特徴とする二重環縫いミシン。   2. The double chain stitch sewing machine according to claim 1, wherein the main feed dog (4) is formed on the upper surface of the main feed dog member (14) extending forward from the main feed dog mounting base (15). The teeth (3) are formed on the upper surface of only the front end portion (16b) of the differential feed dog member (16) extending forward from the differential feed dog mounting base (17), and the main feed dog member (14). The toothless portion (16c) behind the differential feed dog (3) of the differential feed dog member (16) is slidably overlapped on the lower surface side of the differential feed dog member (16) to the main feed dog mounting base (15). On the other hand, a double chain stitch sewing machine, wherein the differential feed dog mounting base (17) is integrally combined so as to be slidable in the front-rear direction in parallel. 請求項２記載の二重環縫いミシンにおいて、差動送り歯（３）及び主送り歯（４）に前後運動及び上下運動を行わせる差動送り機構（５）と、差動送り歯（３）の前後動作量を変更する差動送り調節機構（３３）とを備えていることを特徴とする二重環縫いミシン。   In the double chain stitch sewing machine according to claim 2, a differential feed mechanism (5) for causing the differential feed dog (3) and the main feed dog (4) to move back and forth and up and down, and a differential feed dog (3 And a differential feed adjustment mechanism (33) for changing the amount of back and forth movement of the double chain stitch sewing machine. 請求項３記載の二重環縫いミシンにおいて、差動送り機構（５）は、生地送り方向とほぼ直交する左右方向に架設された主軸（１０）および送り軸（１１）と、主軸（１０）の揺動を主軸（１０）に固着した主送り偏心カム（１２）に嵌着した主送りレバー（１３）を介して送り軸（１１）に伝達する伝動機構とを備え、差動送り歯取付台（１７）と一体的に組み合わされた主送り歯取付台（１５）を、送り軸（１１）上に固定された送り元台（２６）に、主送り歯取付台（１５）に一体的に結合された送り土台（２８）の一端部を枢軸（２９）を介して枢支連結し、その送り土台（２８）の他端部を、主軸（１０）に固着した送り上下偏心カム（３０）に嵌着した送りロッド（３１）にピン（３２）を介して枢支連結しており、送り軸（１１）の揺動に伴い送り元台（２６）が送り軸（１１）回りに前後揺動し、この送り元台（２６）の前後揺動により送り土台（２８）を介して主送り歯取付台（１５）および主送り歯（４）は差動送り歯取付台（１７）および差動送り歯（３）と共に前後に運動し、一方、主軸（１０）の回転により送り上下偏心カム（３０）と送り土台（２８）を介して、主送り歯取付台（１５）および主送り歯（４）は差動送り歯取付台（１７）および差動送り歯（３）と共に上下に運動することにより、主送り歯（４）および差動送り歯（３）はこれらの前後運動と上下運動の合成により楕円運動を行うようにしてあることを特徴とする二重環縫いミシン。   The double chain stitch sewing machine according to claim 3, wherein the differential feed mechanism (5) includes a main shaft (10) and a feed shaft (11) installed in a left-right direction substantially orthogonal to the cloth feed direction, and a main shaft (10). And a transmission mechanism for transmitting to the feed shaft (11) via a main feed lever (13) fitted to a main feed eccentric cam (12) fixed to the main shaft (10), and mounting a differential feed dog The main feed dog mounting base (15) integrally combined with the base (17) is integrated with the main feed dog mounting base (15) to the feed base (26) fixed on the feed shaft (11). One end of the feed base (28) coupled to the shaft is pivotally connected via the pivot (29), and the other end of the feed base (28) is fixed to the main shaft (10). ) Is pivotally connected via a pin (32) to a feed rod (31) fitted to the feed shaft (1). ) Swings back and forth about the feed shaft (11), and the feed base (26) swings back and forth through the feed base (28). (15) and the main feed dog (4) move back and forth together with the differential feed dog mounting base (17) and the differential feed dog (3), while the feed vertical eccentric cam (30) is rotated by the rotation of the main shaft (10). The main feed dog mounting base (15) and the main feed dog (4) move up and down together with the differential feed dog mounting base (17) and the differential feed dog (3) through the feed base (28). The double feed stitching machine is characterized in that the main feed dog (4) and the differential feed dog (3) are designed to perform elliptical motion by combining these longitudinal motion and vertical motion. 請求項４記載の二重環縫いミシンにおいて、差動送り調節機構（３３）は、送り軸（１１）に、上端側に円弧溝（３４）を有する差動調節レバー（３５）を装備し、この差動調節レバー（３５）の円弧溝（３４）に差動調節ピン（３７）の一端側に設けた雄ねじ部（３７ａ）を挿通し、円弧溝（３４）より突出する雄ねじ部（３７ａ）の先端にナット（４１）を締め付け、差動調節ピン（３７）の他端部（３７ｂ）は差動送り連結リンク（３８）の下端部に結合し、差動送り連結リンク（３８）の上端部は、差動送り歯取付台（１７）に枢軸（４０）で枢支連結していることを特徴とする二重環縫いミシン。   The double chain stitch sewing machine according to claim 4, wherein the differential feed adjustment mechanism (33) is equipped with a differential adjustment lever (35) having an arc groove (34) on the upper end side of the feed shaft (11), A male screw part (37a) provided on one end of the differential adjustment pin (37) is inserted into the arc groove (34) of the differential adjustment lever (35), and the male screw part (37a) protruding from the arc groove (34). The nut (41) is tightened to the tip of the differential adjustment pin (37), and the other end (37b) of the differential adjustment pin (37) is coupled to the lower end of the differential feed connection link (38), and the upper end of the differential feed connection link (38). The double chain stitch sewing machine is characterized in that the portion is pivotally connected to the differential feed dog mounting base (17) by a pivot (40). 請求項４記載の二重環縫いミシンにおいて、差動送り調節機構（３３）は、送り軸（１１）に差動調節レバー（４３）を装備し、差動調節レバー（４３）の上端側腕部（４３ａ）にスライダ（４４）を装着し、このスライダ（４４）を差動送り連結リンク（３８）の下端部に第１差動調節リンク（４５）の上端部を介して連結し、差動送り連結リンク（３８）の上端部を差動送り歯取付台（１７）に枢軸（４０）を介して枢支連結し、スライダ（４４）は、第１差動調節リンク（４５）、この第１差動調節リンク（４５）の下端部に差動調節ピン（４６）で連結される第２差動調節リンク（４７）を介して、送り軸（１１）と平行な差動レバー軸（４８）の一端部に連結し、差動レバー軸（４８）の他端部には外部操作レバー（４２）を固定していることを特徴とする二重環縫いミシン。   5. The double chain stitch sewing machine according to claim 4, wherein the differential feed adjustment mechanism (33) is equipped with a differential adjustment lever (43) on the feed shaft (11), and an upper end side arm of the differential adjustment lever (43). The slider (44) is mounted on the portion (43a), and the slider (44) is connected to the lower end of the differential feed connecting link (38) via the upper end of the first differential adjustment link (45). The upper end of the dynamic feed link (38) is pivotally connected to the differential feed dog mount (17) via the pivot (40). The slider (44) is connected to the first differential adjustment link (45). A differential lever shaft (parallel to the feed shaft (11) is connected via a second differential adjustment link (47) connected to the lower end of the first differential adjustment link (45) by a differential adjustment pin (46). 48) and an external operation lever (42) is fixed to the other end of the differential lever shaft (48). Double chain stitch sewing machine, characterized in that is.

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