JPH04164491A - Lower treated cutting device of sewing machine - Google Patents
Lower treated cutting device of sewing machineInfo
- Publication number
- JPH04164491A JPH04164491A JP29298890A JP29298890A JPH04164491A JP H04164491 A JPH04164491 A JP H04164491A JP 29298890 A JP29298890 A JP 29298890A JP 29298890 A JP29298890 A JP 29298890A JP H04164491 A JPH04164491 A JP H04164491A
- Authority
- JP
- Japan
- Prior art keywords
- arm
- thread
- lower thread
- bobbin
- cutter
- 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.)
- Granted
Links
- 238000009958 sewing Methods 0.000 title claims description 9
- 238000009966 trimming Methods 0.000 description 7
- 230000007423 decrease Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Landscapes
- Sewing Machines And Sewing (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
この発明は、ミシン特にボタンの穴かかりミシンの下糸
切断装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a bobbin thread cutting device for a sewing machine, particularly a buttonhole sewing machine.
［従来の技術］
この種の装置としては、従来ｔ５５図に示すものがある
。[Prior Art] As this type of device, there is a conventional device shown in Fig. t55.
図は、針板台の裏面に設けられた下糸切断装置を示す底
面図である。この装置の基本的な構成・作用は、特公平
２−２０７７号に開示された装置とほぼ同様てあり同公
報に詳説されているが。The figure is a bottom view showing a lower thread cutting device provided on the back side of the throat plate stand. The basic structure and operation of this device are almost the same as the device disclosed in Japanese Patent Publication No. 2-2077, and are explained in detail in the same publication.
いま簡単にこれを説明すると。Let me explain this briefly now.
図において、ｌは下糸切りメスで、下糸切り上メス２と
糸押さえバネ３とを軸１ａに係合して、それらは互いに
ハサミ状に形成されて糸切り手段を構成している。４は
、糸タグリアームで、アーム５の先端にリンク６ととも
に回動可能に段ネジ５ａにより軸支されている。そして
、糸タグジアーム４０基端は、リンタフの一端に軸支さ
れている。In the figure, reference numeral 1 denotes a lower thread cutting knife, and an upper lower thread cutting knife 2 and a thread pressing spring 3 are engaged with a shaft 1a, and these are mutually formed into a scissor shape to constitute a thread cutting means. Reference numeral 4 denotes a thread tag arm, which is pivotally supported at the tip of the arm 5 by a step screw 5a so as to be rotatable together with a link 6. The base end of the thread tag arm 40 is pivotally supported by one end of the thread tag.
アーム５は、レバー５ｂの矢符方向への動作により軸５
ｃを中心に回動し、これに伴なって糸タグソアーム４は
、段ネジ５ａを中心に回動するようになっている。The arm 5 is moved around the shaft 5 by movement of the lever 5b in the direction of the arrow.
The thread tag sewn arm 4 rotates around the step screw 5a along with this rotation around the step screw 5a.
なお、図において、８は針板台、９は針穴。In addition, in the figure, 8 is a needle plate base, and 9 is a needle hole.
１０は下糸切り上メス２の開閉＠＠、１１は針板である
。Reference numeral 10 indicates opening/closing of the lower thread trimming upper knife 2, and reference numeral 11 indicates a needle plate.
ｌサイクルの孔かがり縫い目か終了し、ペダルを！Ｉａ
み込むとレバー５ｂが矢符上方向に移動し。Finish the l-cycle hole stitching and pedal! Ia
When you push it in, the lever 5b moves in the upward direction of the arrow.
アーム５は軸５Ｃを中心に反時計方向に回転し。Arm 5 rotates counterclockwise around axis 5C.
これに伴なって糸タグリアーム４の回動先端は、リンク
６．７と協働して針孔９付近で下糸に係合しつつ反時計
方向に回動する。Accordingly, the rotating tip of the thread tag arm 4 rotates counterclockwise while engaging the bobbin thread near the needle hole 9 in cooperation with the link 6.7.
一方、リンク６と協働して下糸切り下メスｌはその軸支
点を中心に時計方向に回動し、下糸切り下メスｌに連結
された下糸切り上メス２と糸押さえバネ３とは、糸タグ
リアーム４の回動先端と協働してして針孔９付近て下糸
を捕捉、して下糸切断寸前の状態になる。On the other hand, in cooperation with the link 6, the lower thread trimming knife l rotates clockwise around its pivot point, and the lower thread trimming knife l connected to the lower thread trimming knife l and the thread presser spring 3 This means that the lower thread is captured near the needle hole 9 in cooperation with the rotating tip of the thread tag arm 4, and the lower thread is about to be cut.
そして、糸タグリアーム４は、さらに反時計方向に回動
しつつ下糸をボビンから引き出す一方、下糸切り下メス
１．下糸切り上メス２、糸押えバネ３は１時計方向に回
動し遂には下糸切り上メス２の保合部２ａがストッパー
８８に当接し、このため下糸は切断され、下糸端部は、
糸押えバネ３と下糸切り上メス２とに保持され次のサイ
クルの待機状態になる。Then, the thread tag arm 4 further rotates counterclockwise to pull out the bobbin thread from the bobbin, while the thread tag arm 4 pulls out the bobbin thread from the bobbin. The upper knife for lower thread trimmer 2 and the thread presser spring 3 rotate clockwise one time, and finally the retaining part 2a of the upper knife for lower thread trimmer 2 comes into contact with the stopper 88, so that the lower thread is cut and the lower thread end is removed. The department is
It is held by the thread presser spring 3 and the lower thread trimmer upper knife 2 and is in a standby state for the next cycle.
なお、２０は下糸捕捉板てあり、止めネジ２０ａにより
ミシン針板台８に固着され、下糸の保持を容易にするこ
とおよび下糸の長さを一定にすることの両機能を有して
いる。Note that a bobbin thread catch plate 20 is fixed to the sewing machine throat plate base 8 with a set screw 20a, and has the functions of both facilitating the holding of the bobbin thread and making the length of the bobbin thread constant. ing.
［発明か解決しようとする課題］
しかしながら、上述の従来技術にあっては、糸タグリア
ームかかなりの高速て回動して下糸に係合するため、下
糸への当接時に下糸か切断するという問題が生じ、これ
は特に婦人物の縫製時に細番手の糸を使用するとき頻発
する。[Problem to be solved by the invention] However, in the above-mentioned prior art, the thread tag arm rotates at a fairly high speed and engages the bobbin thread, so the bobbin thread may be cut when it comes into contact with the bobbin thread. This problem arises particularly when fine thread is used when sewing women's clothing.
また、糸タグリアームか高速で下糸に当接し、糸切り後
も、糸切り手段とボビン間の糸を係合回動してボビンか
ら下糸を繰り出すため、切断時に糸切り手段に挟持され
た下糸端部が糸タグリアームの付勢力により引き抜かれ
てしまうという不都合が生し、この結果１次の縫製動作
に支障を来すこととなる。In addition, the thread tag arm contacts the bobbin thread at high speed, and even after the thread is cut, the thread between the thread cutting means and the bobbin is engaged and rotated to pay out the bobbin thread from the bobbin. An inconvenience arises in that the end of the bobbin thread is pulled out by the biasing force of the thread tag arm, resulting in a hindrance to the primary sewing operation.
［課題を解決するための手段］
この発明は、
ボビンと被縫物間の下糸な所定位置まで回動させて下糸
なボビンから引き出す糸繰り出し機構と、
縫い目形成後に、前記所定位置にきた下糸を切断する糸
切り手段と、を具えたミシンの下糸切断装置において、
前記糸繰り出し機構を、
回動可能な第１アームと、第１アームの先端に一端を軸
支される第１リンク部材と１．この第１リンク部材とと
もに前記第１アームの先端に軸支され第１アームの回動
に従動して前記軸支点を中心に回動する第２アームと、
一端に形成したカム溝に第２アームの基端に設けた係合
ピンを嵌合し第１アームの回動速度を不等速となるよう
規制する第２リンク部材とて、構成し、第２アームの下
糸係合時の回動速度を低下させるようにして、上記従来
の課題を解決しようとするものである。[Means for Solving the Problems] The present invention provides a thread feeding mechanism that rotates a bobbin thread to a predetermined position between a bobbin and a workpiece and pulls the bobbin thread out of the bobbin, A bobbin thread cutting device for a sewing machine includes a thread cutting means for cutting bobbin thread, and the thread feeding mechanism is configured to include a rotatable first arm, and a first arm having one end pivotally supported at the distal end of the first arm. Link members and 1. a second arm that is pivotally supported at the tip of the first arm together with the first link member and rotates about the pivot point following the rotation of the first arm; A second link member is configured to fit an engagement pin provided at the base end of the second arm to regulate the rotational speed of the first arm to be non-uniform, and the rotation speed of the second arm when the bobbin thread is engaged. This is an attempt to solve the above-mentioned conventional problems by reducing the moving speed.
［作用］
この発明において、下糸に当接してこれを回動しつつ下
糸を引き出す＠２アームは、第２リンク部材の規制によ
り、下糸の切！Ｉｉ以降、急速に回動速度か低下するた
め、当接時に糸切れ現象か生じたり、糸切り手段が挟持
する下糸端部を引き抜いてしまうようなことがない。[Function] In this invention, the @2 arm that contacts the bobbin thread and pulls out the bobbin thread while rotating it cuts the bobbin thread due to the regulation of the second link member. After Ii, the rotational speed rapidly decreases, so that there is no possibility of thread breakage occurring during abutting, or of pulling out the lower thread end held by the thread cutting means.
［発明の実施例］
図面に基づいて、この発明の詳細な説明する。なお、従
来例に相当する個所には同一符号を付して説明する。[Embodiments of the Invention] The present invention will be described in detail based on the drawings. Note that parts corresponding to the conventional example will be described with the same reference numerals.
第１区ないし第３図は、この発明の１実施例を示す図で
ある。1 to 3 are diagrams showing one embodiment of the present invention.
図において、ｌは下糸切りメスて、下糸切り上メス２と
糸押さえバネ３とを軸１ａに係合して、それらは互いに
ハサミ状に形成されて糸切り手段を構成している。 ４
は、下糸に当接しこれを回動させるための第２アームで
、第１アーム５の先端に！１リンク部材６とともに回動
可能に段ネジ５ａにより軸支されている。In the figure, reference numeral 1 denotes a lower thread trimmer, and an upper lower thread trimmer knife 2 and a thread presser spring 3 are engaged with a shaft 1a, and these are mutually formed into a scissor shape to constitute a thread trimming means. 4
is the second arm that contacts the bobbin thread and rotates it, and is located at the tip of the first arm 5! 1. It is rotatably supported together with the link member 6 by a step screw 5a.
そして、この第２アーム４の基端は、第２リンク部材１
７の一端に係合されている。The base end of this second arm 4 is connected to the second link member 1.
7.
すなわち、第２リンク部材１７は、その一端に形成した
カム溝１７ａに、前記第２アーム基端の保合ピン４ａを
嵌合させることにより、第２アーム４の基端に係合して
いる。That is, the second link member 17 is engaged with the base end of the second arm 4 by fitting the retaining pin 4a at the base end of the second arm into a cam groove 17a formed at one end thereof. .
なお、第２リンク部材１７の他端は、針板台８に固定さ
れいる。Note that the other end of the second link member 17 is fixed to the throat plate stand 8.
第２リンク部材１７におけるカム溝１７ａは、図示のよ
うに「 形状に穿設され第１アーム５、第２アーム４の
回動にしたかって第２アーム４の係合ピン４ａは、前記
形状のカム溝内をその形状にしたかって移動し第２アー
ム４の回動を規制することになる。The cam groove 17a in the second link member 17 is bored in the shape shown in the figure, and the engagement pin 4a of the second arm 4 has the shape as shown in the figure. It moves within the cam groove to form that shape and restricts the rotation of the second arm 4.
そして、第１アーム５は、レバー５ｂの矢符方向への動
作により軸５Ｃを中心に回動し、これに伴なってｔ！ｉ
４２アーム４は、段ネジ５ａを中心に回動するようにな
っている。Then, the first arm 5 rotates around the shaft 5C by the movement of the lever 5b in the direction of the arrow, and accordingly, t! i
42 arm 4 is adapted to rotate around a stepped screw 5a.
第２アーム４、係合ビン４ａ、第１アーム５、第１リン
ク部材６、第２リンク部材１７、カム溝１７ａにより糸
繰り出し手段か構成されている。The second arm 4, the engaging pin 4a, the first arm 5, the first link member 6, the second link member 17, and the cam groove 17a constitute a thread feeding means.
なお、図において、９は針孔、ｌＯは下糸切り上メス２
の開閉機構である。In the figure, 9 is the needle hole, and 10 is the lower thread trimmer upper knife 2.
This is the opening/closing mechanism.
以上の構成に基づいて、この実施例の作用を説明する。The operation of this embodiment will be explained based on the above configuration.
１サイクルの孔かがり縫い目が終了し、ペダルを踏み込
むと、レバー５ｂか矢符上方向に移動し、第１アーム５
は軸５Ｃを中心に反時計方向に回転を始める。When one cycle of stitching is completed and the pedal is depressed, the lever 5b moves in the upward direction of the arrow and the first arm 5
starts rotating counterclockwise around axis 5C.
すると、第１リンク部材６、糸切り手段か時計方向に回
動しはしめる（糸切り手段のうち上メス２は開閉機構ｌ
Ｏによって縫製中開かれている）。Then, the first link member 6 and the thread cutting means are rotated clockwise and closed (the upper knife 2 of the thread cutting means is connected to the opening/closing mechanism l).
(opened during sewing by O).
これらの各部材の回動に伴なって、第２アーム４の係合
ビン４ａは、第１図に示す待機位置から第２リンク部材
１７のカム溝１７ａ内を水平部に移動し、第２図に示す
ように水平部の左端位置まで移動する。As each of these members rotates, the engagement pin 4a of the second arm 4 moves from the standby position shown in FIG. 1 to the horizontal part within the cam groove 17a of the second link member 17, Move to the left end position of the horizontal part as shown in the figure.
この間、第２アーム４は、段ネジ５ａを中心に反時計方
向に回動するか、一方第１アーム５も軸５ｃを中心に回
動しているから、第２アーム４の回動先端（段ネジ５ａ
を中心に左側）の単位時間の回動量は、第２アーム４自
身の回動量と第１アーム５によるものの和となる。During this time, the second arm 4 rotates counterclockwise around the step screw 5a, or since the first arm 5 also rotates around the shaft 5c, the rotating tip of the second arm 4 ( Step screw 5a
The amount of rotation per unit time (centered on the left side) is the sum of the amount of rotation of the second arm 4 itself and that due to the first arm 5.
ところが、第３図に示すように、第２アーム４の係合ビ
ン４ａかカム溝１７ａの垂直部分に位置すると、第１ア
ーム５の回動に伴ない係合ビン４ａがカム溝１７ａの垂
直部分を下方向（図で）に移動してしまうため、第２ア
ーム４の段ネジ５ａを中心とする回動はほぼなくなって
しまい、第２アーム４の回動先端の回動量は、第１アー
ム５の回動によるのみとなる。具体的には、第１アーム
５の回動珀度と第２アーム４の先端の回動量は、第４図
に示すようになり、点線部は従来例を示している。However, as shown in FIG. 3, when the engaging pin 4a of the second arm 4 is located at the vertical portion of the cam groove 17a, the engaging pin 4a moves vertically to the cam groove 17a as the first arm 5 rotates. As the part moves downward (in the figure), the rotation of the second arm 4 about the stepped screw 5a is almost eliminated, and the amount of rotation of the rotation tip of the second arm 4 is less than that of the first arm. This is only due to the rotation of the arm 5. Specifically, the degree of rotation of the first arm 5 and the amount of rotation of the tip of the second arm 4 are as shown in FIG. 4, and the dotted line indicates the conventional example.
すなわち、第２アーム４の回動先端は、保合ピン４ａが
カム溝１７ａの水平部分を移動しているときは高速て回
動し、逆に保合ピン４ａが垂直部分を移動しているとき
は相対的におそい速度て回動することになる。That is, the rotating tip of the second arm 4 rotates at high speed when the retaining pin 4a is moving in the horizontal portion of the cam groove 17a, and conversely, the rotating tip of the second arm 4 rotates at high speed when the retaining pin 4a is moving in the vertical portion. It will rotate at a relatively slow speed.
このような、第２アーム４の回動を、下糸との係合関係
て説明すると、
第２アーム４の回動先端は、動作開始とともに通常の速
度て回動して針孔９付近て下糸に接近する。To explain the rotation of the second arm 4 in terms of its engagement with the bobbin thread, the tip of the rotation of the second arm 4 rotates at a normal speed at the start of the operation and reaches near the needle hole 9. Approach the bobbin thread.
このとき、係合ビン４ａは、カム溝１７ａ内て第２図の
位置に到達しているから、以後の第２アーム４の回動速
度は急速に低下し、この状態で下糸との保合に向って反
時計方向に回動する。At this time, the engaging pin 4a has reached the position shown in FIG. rotate counterclockwise toward the
一方、第１リンク部材６と協働して下糸切り下メスｌは
、その軸支点を中心に時計方向に回動し、下糸切り下メ
ス１に連結された下糸切り上メス２と糸押さえバネ３と
は、第２アーム４の回動先端と協働して針孔９付近で、
下糸を捕捉して下糸切断寸前の状態になる。On the other hand, in cooperation with the first link member 6, the lower thread trimming knife 1 rotates clockwise around its pivot point, and the lower knife 2, which is connected to the lower knife 1, connects to the lower knife 2. The thread presser spring 3 works in cooperation with the rotating tip of the second arm 4 near the needle hole 9.
The bobbin thread is captured and the bobbin thread is about to be cut.
そして、第２アーム４は、遅い速度でさらに反時計方向
に回動しつつ下糸をボビンから引き出す一方、下糸切り
下メス！、下糸切り上メス２、糸押えバネ３は１時計方
向に回動し、遂には下糸切り上メス２の保合部２ａがス
トッパー８ａに当接し、このため下糸は切断され、下糸
端部は、糸押えバネ３と下糸切り上メス２とに保持され
、次のサイクルの待機状態になる。Then, the second arm 4 further rotates counterclockwise at a slow speed and pulls out the bobbin thread from the bobbin, while cutting the bobbin thread with the lower knife! , the lower thread trimmer upper knife 2 and the thread presser spring 3 rotate one clockwise direction, and finally the retaining part 2a of the lower thread trimmer upper knife 2 comes into contact with the stopper 8a, so that the lower thread is cut and the lower thread is cut. The thread end is held by the thread presser spring 3 and the lower thread trimming knife 2, and is in a standby state for the next cycle.
［発明の効果］
以上説明したように、この発明においては、下糸に当接
してこれを回動しつつ下糸を引き出す第２アームは、第
２リンク部材の規制により、下糸の切断以降、急速に回
動速度か低下する構成としたため、当接時に糸切れ現象
が生じたり、糸切り手段が挟持する下糸端部を引き抜い
てしまうようなことがなく円滑適正な下糸の切断が可能
となる一方、部品点数も少なく製造コストも低廉である
。[Effects of the Invention] As explained above, in the present invention, the second arm that contacts the bobbin thread and pulls out the bobbin thread while rotating the bobbin thread is regulated by the second link member, so that the second arm is able to pull out the bobbin thread after the bobbin thread is cut. Since the rotation speed is configured to rapidly decrease, thread breakage does not occur during abutment, and the thread cutting means does not pull out the end of the bobbin thread held by the thread cutter, allowing for smooth and proper cutting of the bobbin thread. While this is possible, the number of parts is small and the manufacturing cost is low.
第１図ないし第３図は、この発明に係るｌ実施例の底面
図で、第１図は装置の待機位置を、第２図は装置の動作
時を、第３図は装置の動作終了時をそれぞれ示し、第４
図は、第１アームの回動角度と第２アームの先端の回動
量との関係を示すグラフ、１４５図は、従来技術を示す
底面図である。
図において、
出 願 人 ジューキ株式会社
第１図
第３図
第４図
覧］７−へ５Φ回劃へ亀Figures 1 to 3 are bottom views of the embodiment of the present invention, with Figure 1 showing the device in its standby position, Figure 2 showing the device in operation, and Figure 3 showing the device at the end of operation. are shown respectively, and the fourth
FIG. 145 is a graph showing the relationship between the rotation angle of the first arm and the amount of rotation of the tip of the second arm, and FIG. 145 is a bottom view showing the prior art. In the figure, Applicant Juki Co., Ltd. (Figure 1, Figure 3, Figure 4)
Claims (1)
をボビンから引き出す糸繰り出し機構と、 縫い目形成後に、前記所定位置にきた下糸を切断する糸
切り手段と、を具え、 前記糸繰り出し機構は、 回動可能な第１アームと、第１アームの先端に一端を軸
支される第１リンク部材と、この第１リンク部材ととも
に前記第１アームの先端に軸支され第１アームの回動に
従動して前記軸支点を中心に回動する第２アームと、 一端に形成したカム溝に第２アームの基端に設けた係合
ピンを嵌合し第１アームの回動速度を不等速となるよう
規制する第２リンク部材とで、構成して、第２アームの
下糸係合時の回動速度を低下させるようにしたことを特
徴とするミシンの下糸切断装置。[Scope of Claims] A thread payout mechanism that rotates the bobbin thread between the bobbin and the workpiece to a predetermined position and pulls out the bobbin thread from the bobbin, and a thread cutter that cuts the bobbin thread that has reached the predetermined position after forming a seam. The thread feeding mechanism comprises: a rotatable first arm; a first link member having one end pivotally supported at the distal end of the first arm; A second arm is pivotally supported at the tip and rotates about the pivot point following the rotation of the first arm, and an engagement pin provided at the base end of the second arm is fitted into a cam groove formed at one end. and a second link member that regulates the rotational speed of the first arm to be non-uniform, thereby reducing the rotational speed of the second arm when the bobbin thread is engaged. Features a bobbin thread cutting device for sewing machines.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29298890A JPH0759266B2 (en) | 1990-10-30 | 1990-10-30 | Bobbin thread cutting device for sewing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29298890A JPH0759266B2 (en) | 1990-10-30 | 1990-10-30 | Bobbin thread cutting device for sewing machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04164491A true JPH04164491A (en) | 1992-06-10 |
| JPH0759266B2 JPH0759266B2 (en) | 1995-06-28 |
Family
ID=17789020
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29298890A Expired - Fee Related JPH0759266B2 (en) | 1990-10-30 | 1990-10-30 | Bobbin thread cutting device for sewing machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0759266B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4245222B2 (en) * | 1999-03-24 | 2009-03-25 | Ｊｕｋｉ株式会社 | Lower thread cutting device of sewing machine |
| JP4530526B2 (en) * | 2000-12-07 | 2010-08-25 | Ｊｕｋｉ株式会社 | Thread trimmer |
| JP3940588B2 (en) * | 2001-11-26 | 2007-07-04 | Ｊｕｋｉ株式会社 | Bobbin thread cutting machine |
-
1990
- 1990-10-30 JP JP29298890A patent/JPH0759266B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0759266B2 (en) | 1995-06-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |