JPS5823341Y2 - Sewing machine wrinkle prevention device - Google Patents

Description

【考案の詳細な説明】 本考案はミシンの縫皺防止装置、特に一般型式のミシン
の布送りに於ける上下布のズレの発生を抑制する縫皺防
止特許の改良に関するものである。[Detailed Description of the Invention] The present invention relates to an anti-wrinkle device for a sewing machine, and in particular to an improvement of a patented anti-wrinkle device that suppresses the occurrence of misalignment of upper and lower fabrics during cloth feeding in general type sewing machines.

ドロップフィード型式の布送りによる一般型式のミシン
では、押え金の下面と被加工布面との摩擦によって、重
合された加工布の上下で布ズレを生ずることがよく知ら
れている。It is well known that in a general type sewing machine using a drop-feed type cloth feeding method, friction between the lower surface of the presser foot and the surface of the workpiece fabric causes the fabric to shift at the top and bottom of the polymerized workpiece fabric.

そこで此の課題に応する技術手段の例が之迄にも知られ
ており、例えば特公昭３７−１７１８２号の技術では、
送り歯の運動と連動して、その上昇して布送り行程にあ
る間、下側布を下側から挟持拘束して、その送り方向へ
の動きに抵抗を付与することに依て、押え金による上側
布の摩擦抵抗とバランスをとるとの着想である。Therefore, examples of technical means that meet this problem are already known, for example, the technology of Japanese Patent Publication No. 37-17182,
In conjunction with the movement of the feed dog, the presser foot clamps and restrains the lower fabric from below while it is in the fabric feeding process as it rises, providing resistance to its movement in the feeding direction. The idea is to balance the frictional resistance of the upper cloth.

ところで之の技術手段の場合には、送り歯及びその周辺
を特別な構成とすることが必要で、即ち送り歯は針落ち
位置より後方でのみ送り作用をなす長さとし、其の手前
側では針板下側に下側布拘束手段を装着して、該拘束手
段の後端を、送り歯と一体の前方に延びた指状部で持上
げるように構成するものである。By the way, in the case of this technical means, it is necessary to have a special configuration for the feed dog and its surroundings, that is, the feed dog has a length that performs the feeding action only at the rear of the needle drop position, and the needle A lower cloth restraint means is attached to the lower side of the plate, and the rear end of the restraint means is lifted by a forwardly extending finger-like part integrated with the feed dog.

そしてまた此の手段は、下側布拘束手段の弾性支持構成
と、送り歯の上下動に反復追従するその動作上の特徴か
ら、時としてノイズや異状振動を生ずることがあった。Moreover, this means sometimes generates noise and abnormal vibrations due to the elastic support structure of the lower cloth restraint means and its operational feature of repeatedly following the vertical movement of the feed dog.

本考案は、一般型式のミシンの針板下にて、上述例の如
き特殊な構成への変更を要せず、送り歯等はそのままで
、針板より上側で押え金の前端反り上り部分にて、被加
工布を下側より弾性的に支持挟持する手段を設けること
によって、上記先例とは異なる原理に基づく上下布間の
ズレ抑制による縫皺防止の効果を具現した技術手段の提
供をその目的としたもので゛ある。The present invention is installed under the throat plate of a general sewing machine without requiring any changes to the special configuration as in the example above, and the feed dog, etc. remains as is, and the front end of the presser foot is bent above the throat plate. Therefore, it is an object of the present invention to provide a technical means that achieves the effect of preventing seams by suppressing misalignment between the upper and lower fabrics based on a principle different from the above-mentioned precedent by providing a means for elastically supporting and holding the fabric to be processed from the lower side. It is a purpose.

即ち先ず実施例の具体的説明に先立って、第１図に拠っ
て本考案手段の原理を説明すると、本図々示のように、
針板１の上側に送り歯２の歯面が露出中の送り行程の間
では、重合された被加工布の上布３と下布４とは、押え
５に上方がら加えられる図示しない常法通りの押え棒の
手段からの押圧力Ｐによって加圧されており、このとき
下布４は送り歯２によるＡ矢印向きの運動を与えられる
。That is, first, prior to a specific explanation of the embodiments, the principle of the means of the present invention will be explained with reference to FIG. 1. As shown in this figure,
During the feed stroke when the tooth surface of the feed dog 2 is exposed on the upper side of the throat plate 1, the upper cloth 3 and the lower cloth 4 of the polymerized workpiece are applied to the presser foot 5 from above in a conventional manner (not shown). The lower cloth 4 is pressurized by a pressing force P from the means of the presser bar, and at this time the lower cloth 4 is given a movement in the direction of arrow A by the feed dog 2.

同時に上布３は下布４との摩擦によって下布４の移送に
追従しようとするが、その上面で押え金５の面との摩擦
により、該追従に抗する向きの引戻し力Ｑが作用するの
で、その結果として、上布３は下布４の移動量よりも僅
か乍ら小なる送り量を与えられることとなり、上下布ズ
レを生ずることとなる。At the same time, the upper cloth 3 tries to follow the movement of the lower cloth 4 due to friction with the lower cloth 4, but due to friction with the surface of the presser foot 5 on its upper surface, a pullback force Q acts in a direction that opposes this following. Therefore, as a result, the upper cloth 3 is given a slightly smaller feed amount than the movement amount of the lower cloth 4, resulting in upper and lower cloth misalignment.

此処で仮に数字を以って表すとすれば、例えば布質とし
て通常のテトロン綿混紡サージの場合、布とよく磨かれ
た金属との摩擦係数は約０゜０７〜０．０８見当、布と
布では約０．３〜０．４位であり、布押え圧力をＰ＝５
ｋｇと仮定すると、押え金５による上布３の引戻し方向
摩擦力Ｑは約４００ｇであり、即ちこの４００ ｇを補
償するように、上布３にＲ方向に４００ ｇの推力を与
えるか、もしくは、下布４にＱ方向に４００ ｇの引戻
し力を与えれば、上下布ズレを抑制することができる。If we were to express this numerically, for example, in the case of normal Tetron cotton blended serge fabric, the friction coefficient between the fabric and a well-polished metal is approximately 0°07 to 0.08, which is approximately 0.07 to 0.08. For cloth, it is about 0.3 to 0.4, and the presser foot pressure is P = 5.
kg, the frictional force Q in the pulling back direction of the upper cloth 3 by the presser foot 5 is approximately 400 g.In other words, to compensate for this 400 g, a thrust force of 400 g is applied to the upper cloth 3 in the R direction, or By applying a pullback force of 400 g in the Q direction to the lower cloth 4, it is possible to suppress the upper and lower cloths from shifting.

そこで本考案は、この二つの補償策の内、前者の方策で
ある上布３に送り方向に補償推力を与える手段を考究し
たものであり、ついで付言すれば前述の特公昭３７１７
１８２号の先例は、後者の策である下布４に補償引戻し
力を与えるとするものである。Therefore, the present invention is a study of the former of these two compensation measures, which is a means of applying a compensating thrust to the upper cloth 3 in the feeding direction.
The precedent of No. 182 is the latter measure, which is to apply a compensating pullback force to the lower cloth 4.

第１図の説明を続けると、押え金５との摩擦に因る引戻
し力Ｑを補償するため、同じ大きさの推力Ｕを、上下布
間の加圧摩擦によって新たに発生させ、之を押え金５と
送り歯２との間の押圧Ｐによる上布３の追従推力Ｒに加
算しようとするものであって、此の補償推力Ｕを得るた
め、本考案は、送り歯２の四節運動Ｍ中の最前端位置（
図中、右を前方と呼ぶ）の直前で、押え金５の前方反り
上り部５ａの下側にて、上下布３，４の下側から、反り
上り部５ａとの間で上下布３，４を挟着し上向きに加圧
を与える手段として、弾性材から成るリード６を設ける
。Continuing the explanation of Fig. 1, in order to compensate for the pullback force Q caused by friction with the presser foot 5, a thrust force U of the same magnitude is newly generated by pressurized friction between the upper and lower fabrics, and the presser foot This is to be added to the follow-up thrust R of the upper cloth 3 due to the pressure P between the metal 5 and the feed dog 2, and in order to obtain this compensation thrust U, the present invention adds the four-bar movement of the feed dog 2. Frontmost position in M (
In the figure, the right side is referred to as the front), from the bottom of the upper and lower fabrics 3, 4 under the front curved rising part 5a of the presser foot 5, between the upper and lower fabrics 3, 4, the curved rising part 5a, A lead 6 made of an elastic material is provided as a means for pinching 4 and applying upward pressure.

リード６の先端加圧部は同様によく磨かれたものとして
、反り上り部５ａとの間で上下布３，４に加える挟圧力
りは、前記例の数字にならって云うとすれば、布と布間
の摩擦係数が約０．３〜０．４であることから、約４０
０ ｇの所要推力Ｕを生成さすためには約１ｋｇを要す
ることとなる。Assuming that the tip pressurizing part of the lead 6 is similarly well-polished, the clamping pressure applied to the upper and lower cloths 3 and 4 between it and the curved upward part 5a is, if we follow the numbers in the above example, the cloth. Since the coefficient of friction between the cloth and the cloth is approximately 0.3 to 0.4,
Approximately 1 kg is required to generate the required thrust U of 0 g.

但し、此の挟圧の結果として、リード６の下布４との間
にも僅かな摩擦力Ｔが生成するが、同時に上布３と反り
上り部５ａとの間にも同様に摩擦力Ｓが生じ、此の上下
の摩擦力ＳとＴとは、同じ向きで略同じ大きさのものと
云い得るので、此の部分では布ズレの原因を与えるもの
ではない。However, as a result of this clamping pressure, a slight frictional force T is generated between the lead 6 and the lower cloth 4, but at the same time, a similar frictional force S is generated between the upper cloth 3 and the curved upward portion 5a. , and since the upper and lower frictional forces S and T can be said to be in the same direction and have approximately the same magnitude, this portion does not cause cloth displacement.

以上が本考案の原理であり、ドロップフィード型式の普
通のミシンの針板１の下側には、送り歯２の構成もその
まま何の改変も加えず、勿論押え金５も通常のもので、
只その前端反り上り部５ａの下方で、上下布３，４を挟
圧するための上向きの弾性加圧手段なるリード６を設け
、要求に応じて上述の上下布ズレ抑制を与えたり、また
その必要のないとき、該リード６を簡単に此の個所から
離脱させ得るようにした実際的な機構を、実施例として
以下に続けて詳述する。The above is the principle of the present invention, and the structure of the feed dog 2 remains unchanged on the lower side of the throat plate 1 of an ordinary drop-feed sewing machine, without any modification, and of course, the presser foot 5 is also the ordinary one.
However, a lead 6, which is an upward elastic pressure means for pinching the upper and lower cloths 3 and 4, is provided below the curved upward portion 5a at the front end, and the upper and lower cloths can be suppressed from shifting according to the request, or can be used as needed. A practical mechanism that allows the lead 6 to be easily removed from this location when it is not available will be described in detail below as an example.

第２〜５図に於て、ミシンの針板１の下側には通例の如
く送り歯２の四節運動機構（図示せず）が設けられてい
る。2 to 5, a four-bar movement mechanism (not shown) for a feed dog 2 is provided below the throat plate 1 of the sewing machine as usual.

第２図にては下方が、操作者が布送り込みをなす手前側
であり、図示しない被加工布はリード６の上を滑らせて
送り歯２上に誘導される。In FIG. 2, the lower side is the front side where the operator feeds the cloth, and the workpiece cloth (not shown) is guided onto the feed dog 2 by sliding on the lead 6.

本案構成のリード６は使用状態にて図示の位置（第２図
は実線示）にあり、その自由端は第４図の如く押え金５
の前端反り上り部５ａの下側に達している。The lead 6 of the present structure is in the position shown in the figure (shown in solid line in Figure 2) when in use, and its free end is attached to the presser foot 5 as shown in Figure 4.
The front end reaches the lower side of the curved upward portion 5a.

但し第４図には、被加工布の図示を略しているので、反
り上り部５ａとリード６先端の間、および押え金５下面
と送り歯２との間に、夫々被加工布の厚み相当分の空隙
が存在するかのように示されている。However, since the cloth to be processed is not shown in FIG. 4, there are spaces between the curved upward portion 5a and the tip of the lead 6, and between the lower surface of the presser foot 5 and the feed dog 2 that correspond to the thickness of the cloth to be processed. The gap is shown as if it were present.

リード６を此の使用状態から不使用のとき無関係位置に
離脱させるべく、其の変位可能とした実施例構成の説明
を続けると、針板１の直ぐ脇のミシンベッド７面上に、
一対のネジ９によって其の前後方向位置を微調節可能に
Ｌ字形のベース１０が取付けられている。Continuing with the explanation of the structure of the embodiment in which the reed 6 is movable in order to be detached from this used state to an unrelated position when not in use, there is a reed on the surface of the sewing machine bed 7 immediately beside the throat plate 1.
An L-shaped base 10 is attached with a pair of screws 9 so that its longitudinal position can be finely adjusted.

ベース１０上にリード支持腕１１が回動可能に支着され
るが、その枢支部の段付ネジ１２は、ウェーブワッシャ
１３を挾んでリード支持腕１１をベース１０のネジ孔１
０ａに支着するので、リード支持腕１１の回動には抵抗
を与えるようになっている。A lead support arm 11 is rotatably supported on the base 10, and a stepped screw 12 of the pivot portion is inserted between the wave washer 13 and the lead support arm 11 into the screw hole of the base 10.
Since the lead support arm 11 is supported on the lead support arm 11, rotation thereof is resisted.

リード支持腕１１の回動側端にはＬ字型のリード６の基
端と、更にその上側に位置決めバネ１４とが共に一対の
ネジ８によって支着されている。A base end of an L-shaped lead 6 and a positioning spring 14 above the base end of the L-shaped lead 6 are supported by a pair of screws 8 at the rotating end of the lead support arm 11 .

既述のようにリード６は弾性材を以って構成するもので
、その回動端が使用位置で押え金５の前方から、反り上
り部５ａの下側へ重合の位置をとるものである、位置決
めバネ１４は此の使用状態位置にリード６を保持するた
めのもので゛、その屈曲した山部１４□ａで゛ベース１
０の一端に上向きに形成したストッパ１０ｂを弾力的に
把持するものである。As mentioned above, the lead 6 is made of an elastic material, and its rotating end is positioned in the use position from the front of the presser foot 5 to the underside of the curved upward portion 5a. The positioning spring 14 is for holding the lead 6 in this position of use, and its bent peak 14□a is used to hold the base 1.
A stopper 10b formed upward at one end of the 0 is elastically held.

以上の構成で、その用法を今一度まとめると、本案の縫
皺防止装置は、不使用状態では第２図の二点鎖線示の如
く針板７から離隔の方向に置かれ、リード支持腕１１が
その枢支部でウェーブワッシャ１３の作用にて妄動を抑
制された状態で保持される。With the above configuration, to summarize its usage once again, the wrinkle prevention device of the present invention is placed in a direction away from the throat plate 7 as shown by the two-dot chain line in FIG. 2 when not in use, and the lead support arm 11 is held in a state in which the movement is suppressed by the action of the wave washer 13 at the pivot point.

使用するときは、該休止状態のり一ド６Ｒをイ矢印の向
きに回動して本図実線示位置にすると、位置決めバネ１
４の山部１４ ａがベース１０のストッパ１０ｂにスナ
ップアクション式に係合して此の使用位置を保持する。When in use, rotate the resting glue 6R in the direction of the arrow A to the position shown by the solid line in this figure, and the positioning spring 1
4 engages with the stopper 10b of the base 10 in a snap action manner to maintain this use position.

そこでリード６の遊端が既述のように押え金５の前部反
り上り部５ａの下側に臨み、その対峙する両者の間に第
１図の如く被加工布３，４を挟着させた状態にて送り歯
２上に導き、ミシンを運転する。Therefore, the free end of the lead 6 faces the lower side of the front curved upward portion 5a of the presser foot 5 as described above, and the workpiece cloths 3 and 4 are sandwiched between the two facing each other as shown in FIG. In this state, guide it onto the feed dog 2 and operate the sewing machine.

この場合リード６の最先端が上向きに被加工布３，４を
挟圧する強さは、使用する布質種類に依り、厳密には個
々に最適のものを選定することが推将されるが、通常一
般には、例えばポリエステル綿混紡サージ（東洋紡５７
００番）又はブロード（日清紡Ｔ４０番）等を試縫片と
して用いることが多いが、之様な布質の場合、若干その
種類を異にしても、リード６に上記した所要挟圧力りと
しては、７００ｇ−１ｋｇ位の物を（押え金５の押圧力
Ｐ＝５ｋｇのとき）使用することで、抑制に大きく効果
のあることを本考案者は験認している。In this case, the strength with which the leading edge of the reed 6 presses the fabrics 3 and 4 upward depends on the type of fabric used, and strictly speaking, it is recommended to select the optimum strength for each individual. Usually, for example, polyester cotton blend serge (Toyobo 57
00) or broad (Nisshinbo T40), etc., are often used as trial sewing pieces, but in the case of fabrics like these, even if the type is slightly different, the required clamping force as described above for the lead 6 is The present inventor has experimentally found that using a material weighing approximately 700 g - 1 kg (when the pressing force P of the presser foot 5 = 5 kg) is highly effective in suppressing the pressure.

この作用は針及び糸を用いる実際の縫製中は勿論のこと
、針を用いない厳しいテスト条件の下に於ても顕著に現
われる。This effect is noticeable not only during actual sewing using a needle and thread, but also under severe test conditions where no needle is used.

以上の如く本考案の縫皺防止装置は、上向きに被加工布
に挟圧を与える手段を、送り歯の最前端の手前で押え金
の前部反り上り部に対峙する個所に、所望に応じて設定
し、又、不使用のとき該個所より容易に離脱させ得るよ
うにしたものである。As described above, in the wrinkle prevention device of the present invention, the means for applying upward pressure to the fabric to be processed is placed in front of the frontmost end of the feed dog and facing the front curved upward portion of the presser foot as desired. It is also designed so that it can be easily removed from the location when not in use.

そして之様に送り歯の前端に向けて重合布の挟圧より布
間に生ずる伝達推力が、上布に作用する押え金の摩擦抵
抗による布ズレを能く補償することは、即ち、押え金に
よる之様な布ズレが、押え金の押圧面の布進行方向最後
尾である送り歯部端位置に集積されて現われ、それを打
ち消すように上記補償推力が作用することによるもので
あり、従って本案の手段に依れば、針板及び送り歯の構
成には何の改変を要することなく、通常のドロップフィ
ード型式のミシンに本案の手段を付加するのみで縫皺抑
制の目的を能く達成出来、また本案手段は比較的簡単な
構成であるので、実用上至便である。In this way, the transmission thrust generated between the fabrics due to the pinching pressure of the polymeric fabric toward the front end of the feed dog can effectively compensate for fabric displacement due to the frictional resistance of the presser foot acting on the upper fabric. This is due to the fact that the above-mentioned compensating thrust acts to cancel out the fabric displacement which accumulates and appears at the end position of the feed dog portion which is the rearmost position of the pressing surface of the presser foot in the direction of cloth movement. According to the means of the present invention, the purpose of suppressing seam wrinkles can be effectively achieved by simply adding the means of the present invention to a normal drop-feed sewing machine without requiring any modification to the configuration of the throat plate or feed dog. Moreover, since the proposed means has a relatively simple structure, it is convenient in practice.

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

第１図は本考案装置の一要部の側断面図である作用説明
図、第２図以下は実施例にて第２図はその平面図、第３
図はその正面図で、第４図は第２図のＡ−Ａ線に沿う断
面図、第５図は要部の分解斜視図である。 １：針板、２：送り歯、３，４：被加工布（３：上布、
４：下布）、５：布押え金、５ａ：前部反り上り部、６
：リード、７：ミシンベッド、１０：ベース、１０ｂ：
ストッパ、１１：リード支持腕、１２：（枢支用）段付
ネジ、１４：位置決めバネ。Fig. 1 is a side sectional view of the main part of the device of the present invention to explain its operation; Fig. 2 and the following are examples; Fig. 2 is a plan view thereof;
The figure is a front view thereof, FIG. 4 is a sectional view taken along the line A--A in FIG. 2, and FIG. 5 is an exploded perspective view of the main parts. 1: Throat plate, 2: Feed dog, 3, 4: Workpiece cloth (3: Upper cloth,
4: lower cloth), 5: presser foot, 5a: front curved part, 6
: Lead, 7: Sewing machine bed, 10: Base, 10b:
Stopper, 11: Lead support arm, 12: Stepped screw (for pivoting), 14: Positioning spring.

Claims (2)

【実用新案登録請求の範囲】[Scope of utility model registration request] （１）下圧された布押え金と四節運動する送り歯との間
で被加工布を挟着して布送りを与えるドロップフィード
型式のミシンに装着して用いる縫皺防止装置に於て、前
記送り歯の最前端に対峙して前記被加工布を送り込む個
所にて、前記布押え金の前部反り上り部との間で前記被
加工布に其の下側から挟圧を与え該挟圧により前記被加
工布の上下布間にて上布への伝達推力を生じさせる弾性
材のノードを、前記被加工布速り込み個所に設定及び離
脱可能に設けたことを特徴とするミシンの縫皺防止装置
。(1) An anti-wrinkle device used when attached to a drop-feed sewing machine that feeds the fabric by sandwiching the workpiece between a presser foot that is pressurized and a feed dog that moves in four segments. , at a point where the workpiece cloth is fed facing the frontmost end of the feed dog, a pinching pressure is applied to the workpiece cloth from below between it and the front curved upward portion of the presser foot. A sewing machine characterized in that a node of an elastic material that generates a thrust force transmitted between the upper and lower cloths of the workpiece cloth to the upper cloth by pinching can be set and removed at the workpiece cloth fastening point. Wrinkle prevention device. （２）針板の脇のミシンヘッド上に枢着したリード支持
腕の回動端側に前記リードを支着して、其の使用状態位
置では該リード支持腕と之を枢支々持するベースとの間
で位置決めバネとストッパとの保合により位置保持させ
、該リード支持腕を其の枢着点を中心に回動さすことに
より前記リードを不使用位置に離脱させるようにした実
用新案登録請求の範囲（１）に記載のミシンの縫皺防止
装置。(2) A base that supports the reed on the rotating end side of a lead support arm pivotally mounted on the sewing machine head beside the needle plate, and that pivotally supports the lead support arm and the like in the operating position. A registered utility model in which the lead is held in position by engagement between a positioning spring and a stopper, and the lead is detached to a position where it is not in use by rotating the lead support arm around its pivot point. A wrinkle prevention device for a sewing machine according to claim (1).