JPS61159983A - Middle pressing mechanism of sewing machine - Google Patents
Middle pressing mechanism of sewing machineInfo
- Publication number
- JPS61159983A JPS61159983A JP27584184A JP27584184A JPS61159983A JP S61159983 A JPS61159983 A JP S61159983A JP 27584184 A JP27584184 A JP 27584184A JP 27584184 A JP27584184 A JP 27584184A JP S61159983 A JPS61159983 A JP S61159983A
- Authority
- JP
- Japan
- Prior art keywords
- needle
- needle bar
- intermediate presser
- crank rod
- shaft
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Sewing Machines And Sewing (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、ミシンの中押え機構に関し、特に、上軸が
回転し釣合錘を介してクランクロッドを駆動させクラン
クロッドの運動を針棒抱きと中押え棒抱きとに連動して
針棒と上下軸とを上下動ζせるようにしたミシンの中押
え機構に関するものである。[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to an intermediate presser mechanism of a sewing machine, and in particular, the upper shaft rotates and drives a crank rod through a counterweight, and the movement of the crank rod is controlled by the needle bar. This invention relates to an intermediate presser mechanism for a sewing machine in which a needle bar and a vertical shaft can be moved up and down in conjunction with a clamp and an intermediate presser bar clamp.
従来、この種の中押え機構には、！＠６図の斜視図に示
すようなものがある。上軸１が回転すると釣合錘２．ク
ランクロッド３．連結軸４．針棒抱き５を介して、針棒
６が機枠７に固定された針棒上メタル８と針棒下メタル
９に案内されて上下動運動を行なうもので、その下端に
は針１０が取付けられている。また、上軸１に設けられ
次偏心カム１１により偏心カム抱き１２け、 軸ｌ ３
． レバーＡ１４を介して揺動軸１５を揺動させる。揺
動軸１５は、回動可能に機枠７に支承され、先端に連結
されたレバーＢ１６を揺動させる。Conventionally, this type of intermediate presser mechanism had a There is something like the one shown in the perspective view of Figure @6. When the upper shaft 1 rotates, the counterweight 2. Crank rod 3. Connecting shaft 4. A needle bar 6 moves up and down while being guided by a needle bar upper metal 8 and a needle bar lower metal 9 fixed to a machine frame 7 via a needle bar holder 5, and a needle 10 is attached to the lower end of the needle bar 6. It is being In addition, 12 eccentric cams are mounted on the upper shaft 1 and held by a secondary eccentric cam 11, and the shaft l 3
．． The swing shaft 15 is swinged via the lever A14. The swing shaft 15 is rotatably supported by the machine frame 7, and swings a lever B16 connected to its tip.
レバーＢ１６の先端には、長孔部がロリ、その長孔部は
上下軸１７に固定された軸１８に揺動可能に遊嵌される
。上下軸１７は、機枠７に固定され之中押え棒上メタル
１９と中押え棒上メタル２０とに案内されて上下動を行
なうもので、その下端には中押え片２１が取付けられる
。A long hole is provided at the tip of the lever B16, and the long hole is loosely fitted into a shaft 18 fixed to the vertical shaft 17 so as to be swingable. The vertical shaft 17 is fixed to the machine frame 7 and moves up and down guided by an intermediate presser bar upper metal 19 and an intermediate presser bar upper metal 20, and an intermediate presser piece 21 is attached to its lower end.
この種の中押え機構において、カマの捕捉位置は、布の
摩擦抵抗により糸にループが発生し、このループをカマ
先が捕捉して縫目を形成するように針板下で針１０の下
死点よりＡだけ上昇した位置で行なわれると共に、中押
え片２１は、その下死点において布を押えるようになる
のがよい。しかしながら、上述の従来例では、中押え片
２１の上下動は上軸１に設けられた偏心カム１１を介し
て駆動されているため上軸ｌの回転角に対し上下軸１７
の上下動は針棒６に比し一般に小さく滑らかな定周波の
形状となる。第７図の上軸回転角に対する針棒６と上下
軸１７との上下運動曲線で説明すると、
針１０が下死点の位置にあると＠は、押え片２１はＢ点
にあって押え片２１と布との間に隙間がある。In this type of intermediate presser mechanism, the hook is located under the needle 10 under the throat plate so that a loop is generated in the thread due to the frictional resistance of the cloth, and the tip of the hook captures this loop to form a stitch. It is preferable that this is done at a position that is A above the dead center, and that the intermediate presser piece 21 presses the cloth at its bottom dead center. However, in the above-mentioned conventional example, the vertical movement of the intermediate presser piece 21 is driven via the eccentric cam 11 provided on the upper shaft 1.
The vertical movement of the needle bar 6 is generally smaller than that of the needle bar 6 and has a smooth constant frequency wave shape. To explain using the vertical movement curve of the needle bar 6 and the vertical shaft 17 against the rotation angle of the upper shaft in FIG. 7, when the needle 10 is at the bottom dead center position, the presser piece 21 is at point B and the presser piece is There is a gap between 21 and the cloth.
次に、針１０が次第に上昇して０点の位置（針１゜の下
死点よりＡだけ上昇した点）になると、押え片２１は次
第に下降して布との隙間に小さくなってその下死点で布
を確実に押えるようになる。Next, when the needle 10 gradually rises and reaches the 0 point position (the point that is A above the bottom dead center of the needle 1°), the presser foot 21 gradually descends and becomes smaller in the gap with the cloth, and then You will be able to reliably press the cloth at the dead center.
従って、針１０の下死点から上昇するとき、図に示すよ
うに中押え片２１と布との間に斜線部で示す間隙が生ず
るので、針１０が下死点から上昇するとき布と針１０と
の摩擦により布が中押え片２１の下面に接するまで上昇
する。このため針１０の上昇時に布がしごかれて生ずる
ループの大きざが° カマの剣先により捕捉されるだ
けの充分な大きさとならず、″また、ループが捩れてカ
マ剣先に捕捉されず目飛び等を生じる欠点があつ之。Therefore, when the needle 10 rises from the bottom dead center, a gap shown by the shaded area is created between the intermediate presser piece 21 and the cloth as shown in the figure. 10, the cloth rises until it comes into contact with the lower surface of the intermediate presser piece 21. For this reason, the size of the loop that is created when the fabric is squeezed when the needle 10 rises is not large enough to be caught by the tip of the hook, and the loop may be twisted and not caught by the tip of the hook. However, there are drawbacks such as flying.
また、第８図（ａ） 、 ［ｂＪおよびｆｃ） Ｈ１針
１０・上糸１０ａ・布１０ｂ・針板ＩＯＣおよび中押え
片２１の布押え部２１ｂとの関係を示す作動説明図で、
（ａ）は針１０の下死点状態、（ｂ）はカマひっかけ位
置状態。In addition, FIG. 8(a), [bJ and fc) is an operation explanatory diagram showing the relationship between the H1 needle 10, upper thread 10a, cloth 10b, throat plate IOC, and the intermediate presser piece 21 with the cloth presser part 21b.
(a) shows the needle 10 in its bottom dead center state, and (b) shows it in the hooked position.
（Ｃ）は針１０の上死点状態を示す。(C) shows the top dead center state of the needle 10.
この従来例においては、布押え部２１ｂは（Ｃ）図に示
すように針板１０Ｃ面上から低い位置であったため、Ｄ
部にて布押え部２１ｂとの接触により摩擦抵抗となって
上糸１０ａの引ｆ！！締めに悪影響をおよぼし糸線り不
良の原因となっていた。In this conventional example, as shown in FIG.
At this point, frictional resistance occurs due to contact with the presser foot 21b, and the needle thread 10a is pulled f! ! This had a negative effect on tightening and caused poor thread alignment.
更に、上軸１から偏心カム１１を介して上下軸１７を上
下に駆動させる複雑な構成であるため、部品点数が多く
、かつ、組立上多くの工数を労費する等の経済的問題点
もかかえていた。Furthermore, since it has a complicated configuration in which the vertical shaft 17 is driven vertically from the upper shaft 1 via the eccentric cam 11, there are economical problems such as a large number of parts and a large amount of man-hours for assembly. I was holding it.
この発明は、上記した従来の問題点に鑑み為され之もの
であり、その目的は目飛びがなく良好な縫目が得られる
経済的なミシンの中押え機構を提供することにおる。そ
の目的を遂行するために、一端に上軸に回転される釣合
錘に固定したクランク軸に連結する連絡部と他端に駆動
手段を設は之クランクロッド２５の運動を針棒抱きと中
押え棒抱きとに連動して針棒と上下軸とを上下動するよ
うに構成し７念。The present invention has been made in view of the above-mentioned conventional problems, and its purpose is to provide an economical intermediate presser mechanism for a sewing machine that can produce good stitches without skipping stitches. In order to accomplish this purpose, a communication part connected to a crankshaft fixed to a counterweight rotated by the upper shaft is provided at one end, and a driving means is provided at the other end. The needle bar and the vertical shaft are configured to move up and down in conjunction with the presser foot holder.
同一構成（相当）は同−付号を付し、以下この発明の実
施例について説明する。第１図において、針棒抱＠５．
針棒６．針棒上メタル８．針棒下メタル９．針１０は、
従来の針棒機構と同様でるる。Identical configurations (equivalent) are given the same numerals, and embodiments of the present invention will be described below. In FIG. 1, the needle bar holder @5.
Needle bar6. Needle bar upper metal 8. Needle bar lower metal 9. The needle 10 is
It is similar to the conventional needle bar mechanism.
上下軸１７は機枠７に固定され之中押え上メタル１９と
中押え下メタル２０に軸支でれて上下に往復運動を行な
うもので、その下端に針１ｏの貫通する針孔２１ａを有
する布押え部２１ｂをもつ中押え片２１が螺子２２で取
付けられている。２３は、中押え棒抱きであり、水千万
回に延出する腕２３ａに長孔部２３ｂを設け、螺子２４
により上下軸１７に固着する。The vertical shaft 17 is fixed to the machine frame 7 and pivoted on the upper metal 19 and lower metal 20 of the intermediate presser to reciprocate vertically, and has a needle hole 21a at its lower end through which the needle 1o passes. An intermediate presser piece 21 having a cloth presser portion 21b is attached with a screw 22. Reference numeral 23 denotes an intermediate presser bar holder, in which an elongated hole 23b is provided in an arm 23a that extends over a million times, and a screw 24 is provided.
It is fixed to the vertical shaft 17 by this.
２５ば、逆り形をしたクランクロッドであり、その基部
２５ａに対して互に直角方向に延出する腕２５ｂ （！
：椀２５Ｃトを有し、腕２５ｂト腕２５Ｃ１７Ｃハ連結
部２５ｄと基部２５Ｈに対して垂直方向にコロを回動自
在に遊嵌した軸部よりなる係合片２５ｅとをそれぞれ設
ける。クランクロッド２５の腕２５ｂと腕２５Ｃとの間
の基部２５ａは、針棒６に螺子２６で固着これた針棒抱
き５の突出軸５ａの段差部に遊嵌し螺子着されると共に
その段差部で抜止的に回動自在に規制される。25 is an inverted crank rod, and arms 25b (!) extend perpendicularly to the base 25a of the crank rod.
: It has a bowl 25C, and arms 25b and 25C17C are each provided with a connecting portion 25d and an engaging piece 25e made of a shaft portion in which a roller is freely rotatably fitted in a direction perpendicular to the base 25H. The base 25a between the arm 25b and the arm 25C of the crank rod 25 is loosely fitted and screwed into the stepped portion of the protruding shaft 5a of the needle bar holder 5, which is fixed to the needle bar 6 with the screw 26. It is regulated so that it can rotate freely in a way that prevents it from coming off.
また、クランクロッド２５の腕２５Ｃに設けた係合片２
５ｅは、中押え棒抱き２３の腕２３ａに設ｉ’ｊた長孔
部２３ｂに挿嵌し互に係合するように取付ける。Further, the engagement piece 2 provided on the arm 25C of the crank rod 25
5e is fitted into the elongated hole 23b formed in the arm 23a of the intermediate presser bar holder 23 so as to be engaged with each other.
クランクロッド２５の腕２５ｂの連結部２５ｄは、釣合
＠２の一端に固定したクランク軸２７に連結する。A connecting portion 25d of the arm 25b of the crank rod 25 is connected to a crankshaft 27 fixed to one end of the balance @2.
釣合錘２は、ミシンの駆動源（図示しないンにより駆動
される上軸１に固定てれる。ここで、針棒６および中押
え機構の上下軸１７の運動ｔｕ、上軸１の中心がらクラ
ンク軸２７の中・し・までの心間距離で決まる。The counterweight 2 is fixed to an upper shaft 1 driven by a drive source (not shown) of the sewing machine.Here, the movement tu of the needle bar 6 and the vertical shaft 17 of the intermediate presser mechanism, It is determined by the distance between the centers of the crankshaft 27.
作用を説明すると、上軸１が回転し、釣合錘２の回転に
より、釣合錘２に固定されｔクランク軸２７か円運動し
て、クランク軸２７に連結され几クランクロッド２５は
上下方向に往復運動を行う。To explain the operation, the upper shaft 1 rotates, and as the counterweight 2 rotates, the crankshaft 27 fixed to the counterweight 2 moves circularly and is connected to the crankshaft 27, and the crank rod 25 moves in the vertical direction. perform a reciprocating motion.
−万、クランクロッド２５の基部２５ａは、針棒抱＠５
と回動自在に結合され、また、クランクロッド２５の腕
２５Ｃに設けた係合片２５ｅは、中押え棒抱＠２３の長
孔部２３ｂに摺接可能に係付される。- 10,000, the base 25a of the crank rod 25 is connected to the needle bar holder @5
The engaging piece 25e provided on the arm 25C of the crank rod 25 is slidably engaged with the elongated hole 23b of the intermediate presser bar holder @23.
従って、クランクロッド２７が円運動してクランクロッ
ド２５の上下方向の往復運動により基部２５ａを経て針
棒抱＠５を介して針棒６を上下動すると共に、他方、係
合片２５ｅを経て中押え棒抱き２３を介して上下軸１７
を上下動させる。−万、第２図において、クランクロッ
ド２５の腕２５ｂおよび腕２５Ｃの長ざを図示のように
それぞれｌＩおよび１２ とする。Therefore, the crank rod 27 moves circularly, and the vertical reciprocating movement of the crank rod 25 causes the needle bar 6 to move up and down via the base 25a and the needle bar holder @5. The vertical shaft 17 is connected via the presser bar holder 23.
move up and down. - In FIG. 2, the lengths of the arms 25b and 25C of the crank rod 25 are 1I and 12, respectively, as shown.
いま、第３図において、クランク軸２７（クランクロッ
ド２５の連結部２５ａ）が円運動して最下位（１８０°
）の位置にくると、クランクロッド２５の基部２５ａは
０点、係合片２５ｅはｂ点にあって針棒６の下端に取付
けられた針１０は下死点にある。Now, in FIG. 3, the crankshaft 27 (the connecting portion 25a of the crank rod 25) moves circularly to the lowest position (180°
), the base 25a of the crank rod 25 is at the 0 point, the engaging piece 25e is at the b point, and the needle 10 attached to the lower end of the needle bar 6 is at the bottom dead center.
次に、上軸１が回転してクランクロッド２５の連結部２
５ｄ ７！Ｉ″−ａ、点になると、クランクロッド２５
の基部２５ａは０１点、係合片２５ｅはす８点にあって
、針１０はＸ、だけ下死点より上昇する。Next, the upper shaft 1 rotates and the connecting portion 2 of the crank rod 25
5d 7! When the point I″-a is reached, the crank rod 25
The base 25a is at the 01 point, the engagement piece 25e is at the 8 point, and the needle 10 is raised by X from the bottom dead center.
従って、クランクロッド２５の連結部２５ｄかａ点から
ａ、まで移動したときの針棒６のストｏ−りは次式で示
される。Therefore, the stroke of the needle bar 6 when the connecting portion 25d of the crank rod 25 moves from point a to point a is expressed by the following equation.
ここで、θは、ａ＠ ａ、 の中心角、ｒにクランク
ロッド２５の連結部２５ｄの回転半径でるる。Here, θ is the center angle of a@a, and r is the radius of rotation of the connecting portion 25d of the crank rod 25.
また、クランクロッド２５の連結部２５ｄがａ点からａ
、まで移動したとき、クランクロッド２５の係合片２５
ｅの位置はｂ点からす、点に移動する。 従って、上下
軸１７０ストロークは、×２でろって次式で示される。Also, the connecting portion 25d of the crank rod 25 is moved from point a to point a.
, the engagement piece 25 of the crank rod 25
The position of e moves from point b to point b. Therefore, the stroke of the vertical axis 170 is expressed as x2 by the following equation.
ｘ２＝ ｘ、 −ｘ、 ここで、 ｘ、 ＝ １２ｓ
ｉｎψであるから以上の関係を回転角θに対する針棒６
（Ｘ、）および上下軸１７（Ｘｔ）の上下運動曲線とし
て図示すると第４図に示したようになる。x2= x, -x, where x, = 12s
Since inψ, the above relationship is expressed as needle bar 6 with respect to rotation angle θ.
(X,) and the vertical movement curve of the vertical axis 17 (Xt) as shown in FIG. 4.
即ち、針１０の下死点Ｂの後に鞘厚の下面に対して極め
て僅かな間隙が図示のように存在するようになったので
、針１０の下死点Ｂより直前から 。That is, after the bottom dead center B of the needle 10, an extremely small gap exists with respect to the lower surface of the sheath thickness as shown in the figure, so that from just before the bottom dead center B of the needle 10.
上下軸１７の先端に取付けた中押え片２１は布の上面を
確実に保持し、針１０が針板下でその下死点よりｌ’ｌ
上昇した位置およびその後も連続的に布の上面を保持す
るようになる。The intermediate presser piece 21 attached to the tip of the vertical shaft 17 securely holds the upper surface of the cloth, and the needle 10 is positioned below the throat plate l'l from its bottom dead center.
The upper surface of the cloth is continuously held in the raised position and thereafter.
従って、針１０が、その下死点から上昇するとき、糸ル
ープを捩ったり小感＜シ之りすることがなく、カマの剣
先により捕捉されるだけの充分な大きさとなってカマの
剣先に確実に捕捉され、目飛がなく良好な縫目が得られ
る。Therefore, as the needle 10 rises from its bottom dead center, it becomes large enough to be captured by the tip of the hook without twisting or pinching the thread loop. The stitches are reliably captured, and good stitches can be obtained without skipped stitches.
次に、中押え棒抱＠２３の長孔部２３ｂの長きの選定に
ついて第３図で説明する。−例として、ｒ ＝ ２０．
５ｍｍ、 ｌ（＝ ５３ｍｍ、 １２ ＝１６ｍｍ
とし、で、クランクロッド２５の係止片２５ｅの最下位
点ｂ２を求めて柿２と図示の点線のようになって、θ÷
１５゜となる。Next, selection of the length of the elongated hole portion 23b of the intermediate presser bar holder @23 will be explained with reference to FIG. - As an example, r = 20.
5mm, l (= 53mm, 12 = 16mm
Then, find the lowest point b2 of the locking piece 25e of the crank rod 25, and find the lowest point b2 of the locking piece 25e of the crank rod 25, and calculate θ÷
It becomes 15°.
いま、クランクロッド２５の連結部２５ｄが、ａ点から
一回転してａ点に戻る間の係止片２５ｅの軌跡は、ｂ点
〜ｂ２点〜ｂ５点〜ｂｎ点〜ｂ４点〜ｂ２点〜ｂ点とな
って点線で示される。従って、曲Ｍ ｂｔ・ｂｎの変化
幅Ｘ３が中押え俸抱＠２３の長孔部２３ｂの長さ方向の
長さとなる。′！！た、上述の説明では、クランクロッ
ド２５の＠２５Ｃに係合片２５ｅを設けて駆動手段、中
押え俸抱き２３の腕２３ａに長孔部２３ｂを設けて伝達
手段をそれぞれ構成したが、クランクロッド２５の腕２
５Ｃ方向に長孔部、中押え棒抱き２３の腕２３ａに係合
片をそれぞれ設けて駆動手段と伝達手段とを構成しても
よ匹。Now, the trajectory of the locking piece 25e while the connecting portion 25d of the crank rod 25 makes one rotation from point a and returns to point a is as follows: point b - point b2 - point b5 - point bn - point b4 - point b2 - Point b is indicated by a dotted line. Therefore, the change width X3 of the music M bt·bn becomes the length in the longitudinal direction of the elongated hole portion 23b of the intermediate presser grip @23. ′! ! In addition, in the above explanation, the engaging piece 25e was provided on @25C of the crank rod 25 to constitute the driving means, and the elongated hole portion 23b was provided in the arm 23a of the intermediate presser holder 23 to constitute the transmission means. 25 arms 2
The driving means and the transmission means may be constructed by providing an engaging piece in the elongated hole portion and the arm 23a of the intermediate presser rod holder 23 in the direction 5C.
更に、この発明による中押え片２１の布押え部２１ｂの
作動について第５図（ａｌ、 （ｂ）および（Ｃ）によ
り説明する。（ａ）は針１ｏの下死点状態、（ｂｌＨカ
マひっかけ位置状態、（Ｃ）は針１ｏの上死点状、暢を
示す。Furthermore, the operation of the material presser part 21b of the intermediate presser piece 21 according to the present invention will be explained with reference to FIGS. The position state (C) shows the top dead center position of the needle 1o.
この発明では、クランクロッド２５の運動に上り針棒６
（針１０）の動ＰＵ、（ａ）、 （ｂ）および（ｃｌ
ＩＫ、 示す様な運動を行う。従って、布押え部２１ｂ
は（Ｃ）に示すように９部にて上糸１０ａを締め上げる
動作を伴い先締りに対して効果的である。In this invention, the movement of the crank rod 25 causes an upward movement of the needle bar 6.
(needle 10) dynamic PU, (a), (b) and (cl
IK, perform the exercises shown. Therefore, the presser foot 21b
As shown in (C), the upper thread 10a is tightened at the 9th section and is effective against tightening.
尚、この発明は、刺しゅうミシンについて説明したが他
のミシンにも発明の主旨に逸脱しない範囲で有効である
。Although the present invention has been described with respect to an embroidery sewing machine, it is also applicable to other sewing machines within the scope of the invention.
更に、クランクロッド２５と針棒抱＠５および中押え棒
抱き２３との結合および係合等については、若干の設計
変更可能なことも包含する。Furthermore, the connection and engagement between the crank rod 25 and the needle bar holder @5 and the intermediate presser bar holder 23 may be slightly modified in design.
この発明は、以上詳述し之ように、上軸Ｉが回転し釣合
錘２に固定されたクランク軸２７が円運動してクランク
ロッド２５を上下方向に往復運動させ、針棒抱き５と中
押え棒抱き２３とを連動して針棒６を上下動きせると共
に、クランクロッド２５の駆動手段と中押え棒抱き２３
の伝達手段とが係合して上下軸１７を上下動するように
構成した。従って、針ｌＯが下死点から上昇してカマ剣
先が糸のループを捕捉する時点でｒｉ確実に中押え片２
１が布の上面を押えるようにしたから、糸ルーズを捩つ
之り、小ざくしたりすることがなくカマ剣先に確実に捕
捉され、目飛びがなく、良好な縫目が得られる。As described in detail above, in this invention, the upper shaft I rotates and the crankshaft 27 fixed to the counterweight 2 moves in a circular motion, causing the crank rod 25 to reciprocate in the vertical direction. The needle bar 6 is moved up and down in conjunction with the intermediate presser bar holder 23, and the driving means of the crank rod 25 and the intermediate presser bar holder 23
The vertical shaft 17 is configured to be engaged with the transmission means to move the vertical shaft 17 vertically. Therefore, when the needle lO rises from the bottom dead center and the tip of the hook catches the thread loop, the intermediate presser piece 2
1 presses the top surface of the cloth, so the loose thread is securely captured by the tip of the hook without twisting or making it small, and good stitches can be obtained without skipping stitches.
１ｔ、上軸１から釣合錘２を介してクランクロッド２５
により針棒６および上下軸１７を駆動するようにしたの
で、機構が頗る簡単となると共に、針棒６と上下軸１７
の振幅が同等となり、そのために、従来から使用されて
いる中押え片２１の引き上げ装置（布の出し入れ時に電
磁ソレノイド又は機械的な機構によって中押え片２１を
上方に引き上げる装置）は不要になる等の経済的に優れ
た効果がある。1t, crank rod 25 from upper shaft 1 via counterweight 2
Since the needle bar 6 and the vertical shaft 17 are driven by the needle bar 6 and the vertical shaft 17, the mechanism is extremely simple.
The amplitudes of the intermediate presser pieces 21 become the same, and therefore, the conventionally used lifting device for the intermediate presser piece 21 (a device that pulls the intermediate presser piece 21 upward using an electromagnetic solenoid or a mechanical mechanism when loading and unloading cloth) becomes unnecessary, etc. It has excellent economic effects.
更に、中押え片２１と針棒６とは、上昇時に同じ高さに
なって可成り上昇するので、被縫物の糸を締め上げるよ
うに作用するから糸のめばれをなくすことが可能となる
等の品質向上に効果がある等の多くの実用的効果を有す
る。Furthermore, since the intermediate presser foot 21 and the needle bar 6 rise to the same height and rise considerably, they act to tighten the threads of the workpiece, making it possible to eliminate thread twisting. It has many practical effects, such as improving quality.
第１図は、本発明の実施例を示す斜視図、第２図は、本
発明の要部であるクランクロッドの正ＷＪ図、第３図は
、不発明の実施例の作動説明図、第４図は、本発明の実
施例の上軸回転角に対する針棒および上下軸の上下運動
曲線、第５図は、不発明の実施例の針・上糸・布・針板
・布押え部との関係を示す作動説明、第６図は、従来例
を示す斜視図、第７図は、従来例の上軸回転角に対する
針棒および上下軸の上下運動曲線、第８図は、従来例の
針・上糸・布・針板・布押え部との関係を示す作動説明
図である。
出願人の名称 東京重機工業株式会社第７図
１１ 軸 ２１才押り丼
、／７上下津由
第３図
第４図
第６図
第７図
自発手続補正書
昭和６１年１月２０日
１、事件の表示
昭和５９年臀許願第２７５８４１号
２、発明の名称
ミシンの中押え機構
４補正命令の日付 昭和４１年１月２０日（自発〕
６、補正の内容
第３図の「角度θ」の表示を別紙のとおり訂正する。FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a front WJ view of a crank rod which is a main part of the present invention, and FIG. Figure 4 shows the vertical movement curves of the needle bar and the vertical axis relative to the rotation angle of the upper shaft in the embodiment of the invention, and Figure 5 shows the needle, needle thread, fabric, throat plate, and presser foot in the embodiment of the invention. Fig. 6 is a perspective view showing the conventional example, Fig. 7 is the vertical movement curve of the needle bar and the vertical shaft with respect to the upper shaft rotation angle of the conventional example, and Fig. 8 is the vertical movement curve of the conventional example. FIG. 3 is an operation explanatory diagram showing the relationship among the needle, needle thread, cloth, needle plate, and cloth presser foot. Applicant's name Tokyo Heavy Equipment Industry Co., Ltd. Figure 7 Figure 11 Axis 21 year old Oshidon, /7 Yu Shimotsu Figure 3 Figure 4 Figure 6 Figure 7 Voluntary procedure amendment January 20, 1985 1, Indication of the case: 1976 Permit Application No. 275841 2 Name of the invention Intermediate presser mechanism for sewing machines 4 Date of amendment order January 20, 1960 (spontaneous)
6. Details of correction The display of "angle θ" in Figure 3 will be corrected as shown in the attached sheet.
Claims (1)
運動をするクランク軸２７と、機枠７に上下動可能に支
持され下端に針１０をもつ針棒６と、 針棒６と間隔を置いて併設し前記機枠７に上下動可能に
支持される上下軸１７と、上下軸１７の下端に前記針１
０の上下通路に貫設し布押え部２１ｂをもつ中押え片２
１と、基部を針棒６に固定した針棒抱き５と、基部を上
下軸１７に固定し一端を側方に延出して伝達手段を形成
した中押え棒抱き２３と、基部２５ａを針棒抱き５に回
動自在に遊嵌し、一端を上方に延出してクランク軸２７
に回動自在に連結し、他端を側方に延出して中押え棒抱
き２３の伝達手段と連結する駆動手段を形成したクラン
クロット２５とを備え、 上軸１の回転によりクランクロッド２５を上下方向に往
復運動させクランクロッド２５の運動を針棒抱き５と中
押え棒抱き２３とに連動して針棒６を上下動させると共
に上下軸１７を上下動させ針１０の下死点直前より先方
まで連続して布の上面を保持するように構成したことを
特徴とするミシンの中押え機構。[Claims] A counterweight 2 rotated by the upper shaft 1, a crankshaft 27 fixed to the counterweight 2 and moving in a circular motion, and a needle 10 supported on the machine frame 7 so as to be movable up and down. a vertical shaft 17 which is provided side by side with the needle bar 6 at a distance and is vertically movably supported by the machine frame 7;
Intermediate presser piece 2 penetrating through the upper and lower passages of 0 and having a cloth presser part 21b
1, a needle bar holder 5 whose base is fixed to the needle bar 6, an intermediate presser bar holder 23 whose base is fixed to the vertical shaft 17 and whose one end extends laterally to form a transmission means, and a base 25a which is fixed to the needle bar 6. The crankshaft 27 is rotatably fitted loosely into the retainer 5 and has one end extending upward.
The crank rod 25 is rotatably connected to the upper shaft 1 and has a crank rod 25 whose other end extends laterally to form a driving means connected to the transmission means of the intermediate presser rod holder 23. The movement of the crank rod 25 is reciprocated in the vertical direction, and the needle bar 6 is moved up and down in conjunction with the needle bar holder 5 and the intermediate presser bar holder 23, and the vertical shaft 17 is also moved up and down, starting just before the bottom dead center of the needle 10. An intermediate presser mechanism for a sewing machine, characterized in that it is configured to continuously hold the upper surface of the cloth all the way to the tip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27584184A JPS61159983A (en) | 1984-12-29 | 1984-12-29 | Middle pressing mechanism of sewing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27584184A JPS61159983A (en) | 1984-12-29 | 1984-12-29 | Middle pressing mechanism of sewing machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61159983A true JPS61159983A (en) | 1986-07-19 |
Family
ID=17561176
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27584184A Pending JPS61159983A (en) | 1984-12-29 | 1984-12-29 | Middle pressing mechanism of sewing machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61159983A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5373795A (en) * | 1992-10-23 | 1994-12-20 | Brother Kogyo Kabushiki Kaisha | Sewing machine having a presser foot driven independently of a needle bar |
-
1984
- 1984-12-29 JP JP27584184A patent/JPS61159983A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5373795A (en) * | 1992-10-23 | 1994-12-20 | Brother Kogyo Kabushiki Kaisha | Sewing machine having a presser foot driven independently of a needle bar |
| CN1037366C (en) * | 1992-10-23 | 1998-02-11 | 兄弟工业株式会社 | Sewing machine |
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