JPH0228353B2 - - Google Patents
Info
- Publication number
- JPH0228353B2 JPH0228353B2 JP56145579A JP14557981A JPH0228353B2 JP H0228353 B2 JPH0228353 B2 JP H0228353B2 JP 56145579 A JP56145579 A JP 56145579A JP 14557981 A JP14557981 A JP 14557981A JP H0228353 B2 JPH0228353 B2 JP H0228353B2
- Authority
- JP
- Japan
- Prior art keywords
- thread
- pull
- bobbin thread
- bobbin
- thread tension
- 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.)
- Expired - Lifetime
Links
- 238000009958 sewing Methods 0.000 claims description 31
- 239000004744 fabric Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000002779 inactivation Effects 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
Landscapes
- Sewing Machines And Sewing (AREA)
Description
【発明の詳細な説明】
本発明は、本縫ミシンにおける縫目調節装置に
係り、特に縫いの種類に応じて縫目の調節が常に
最適になるようにした本縫ミシンにおける縫目調
節装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stitch adjustment device for a lockstitch sewing machine, and more particularly to a stitch adjustment device for a lockstitch sewing machine that allows stitch adjustment to be always optimal depending on the type of sewing. .
（従来技術）
従来、本縫ミシンにおける縫目調節は、一般に
容易にできる上糸張力の調節によつて行われてい
る。(Prior Art) Conventionally, stitch adjustment in a lockstitch sewing machine is generally performed by easily adjusting needle thread tension.
即ち、上糸調子器の操作ダイヤルを操作して上
糸張力の調節が行われているが、稀には下糸を収
容しているボビンケースの調子ばねを調節して下
糸張力を調節することもあつた。しかしこの下糸
張力の調節は面倒なのであまり行われていなかつ
た。 That is, the upper thread tension is adjusted by operating the operation dial of the upper thread tension device, but in rare cases, the lower thread tension is adjusted by adjusting the tension spring of the bobbin case that houses the lower thread. Things were also hot. However, this adjustment of the bobbin thread tension is troublesome and has not been carried out very often.
このため本縫ミシンにおける各種の縫いに対し
て最適の縫目を得ることはできなかつた。例え
ば、第１図に示すように、直線縫においては、上
糸１と下糸２の交差点Ｐは布３のほぼ中央部ａ点
で交差することが望ましいが、第２図に示すよう
に、ジグザグ縫においては上糸１と下糸２との交
差点Ｐを布厚の中央部ｂ点にすると、下糸２が布
３上面より見えるので望ましくなく、むしろ第３
図に示すように、交差点Ｐを布３の下面ｃ点に移
動させるのが望ましい。 For this reason, it has not been possible to obtain optimal stitches for various types of stitches in a lockstitch sewing machine. For example, as shown in FIG. 1, in straight stitching, it is desirable that the intersection P of the upper thread 1 and the lower thread 2 intersect at a point a in the approximate center of the fabric 3, but as shown in FIG. In zigzag stitching, if the intersection point P of upper thread 1 and lower thread 2 is set at point b in the center of the fabric thickness, it is not desirable because the lower thread 2 will be visible from the upper surface of the fabric 3.
As shown in the figure, it is desirable to move the intersection point P to point c on the lower surface of the cloth 3.
このように本縫ミシンにおいては、縫いの種類
によつて上糸１と下糸２との交差点Ｐの位置を変
えることが望ましいものであり、このため上糸張
力及び下糸張力をその都度調節することが望まし
いが、この作業、特に下糸張力の調節は面倒であ
り、作業者にとつて非常に煩しいことであつた。 In this way, in a lockstitch sewing machine, it is desirable to change the position of the intersection point P between upper thread 1 and lower thread 2 depending on the type of sewing, and for this reason, the upper thread tension and lower thread tension are adjusted each time. However, this work, especially adjusting the bobbin thread tension, is troublesome and extremely troublesome for the operator.
（目的）
本発明は、上記のような従来技術の欠点を除く
ためになされたものであつて、その目的とすると
ころは、上糸張力及び下糸張力に関係のある天秤
上死点付近における下糸の引出し量を操作部材の
操作に連動して調節できるようにすることによ
り、各種の縫いの種類に応じて最も望ましい縫目
が得られるようにすることである。また他の目的
は、特定の縫いに対して最も望ましい縫目が得ら
れるように予め調節しておくだけで、他の縫いに
対しても自動的に最も望ましい縫目が得られるよ
うにすることである。(Objective) The present invention has been made in order to eliminate the drawbacks of the prior art as described above, and its purpose is to The object of the present invention is to enable the most desirable stitches to be obtained in accordance with various types of stitches by making it possible to adjust the withdrawal amount of the bobbin thread in conjunction with the operation of an operating member. Another purpose is to automatically obtain the most desirable stitches for other stitches by simply making adjustments in advance to obtain the most desirable stitch for a particular stitch. It is.
（解決手段）
要するに本発明は、縫い目毎に釜機構より下糸
を引き出すようにした下糸引出し部材を設けた本
縫ミシンにおいて、前記下糸引出し部材の下糸引
出し量を制御する下糸制御部材を操作部材に連動
して作動させる下糸引出し調節装置と、一対の糸
調子皿に上糸張力を付与する一組の糸調子ばねの
一方を前記操作部材に連動して作動と不作動の状
態に切り替えることができる上糸張力調節装置と
を設けたことを特徴とするものである。(Solution Means) In short, the present invention provides a lockstitch sewing machine equipped with a bobbin thread pull-out member that pulls out the bobbin thread from the hook mechanism for each stitch, and a bobbin thread control that controls the amount of bobbin thread pulled out by the bobbin thread pull-out member. A lower thread pull-out adjustment device operates a member in conjunction with an operating member, and one of a set of thread tension springs that applies upper thread tension to a pair of thread tension discs is operated or inoperable in conjunction with the operating member. The present invention is characterized in that it is provided with a needle thread tension adjusting device that can be switched to a different state.
（実施例）
以下本発明を図面に示す実施例に基づいて説明
する。第４図〜第６図において、本発明に係る装
置５は、縫模様選択装置６、上糸張力調節装置７
及び下糸引出し調節装置８を備えている。(Example) The present invention will be described below based on an example shown in the drawings. 4 to 6, the device 5 according to the present invention includes a sewing pattern selection device 6, a needle thread tension adjustment device 7, and a needle thread tension adjustment device 7.
and a bobbin thread drawer adjustment device 8.
縫模様選択装置６は、ミシン機枠（図示せず）
に固着されたカム軸１０、該カム軸にミシン機枠
に回動自在に支承された上軸１１に連動して歯車
機構１２を介して回動自在に嵌挿された複数の模
様カム１３、カム軸１０と平行に配置された送り
ねじ軸１４に螺合し模様カム１３に選択的に係合
する振幅用従動子１５及びミシン機枠に回動自在
に支承されたダイヤル軸（図示せず）に固着され
た操作部材の一例たる模様選択ダイヤル１６を備
えている。該模様選択ダイヤル１６を回転させる
と、ダイヤル軸及び送りねじ軸１４に夫々固着さ
れた爪車１７とこれら爪車に装架されたベルト１
８を介して送りねじ軸１４が回転し、振幅用従動
子１５が軸方向に移動し模様カム１３に選択的に
係合するようになつている。そして振幅用従動子
１５の揺動運動は振幅ロツド１９を介して図示し
ない針棒に揺動運動を付与するようになつてい
る。 The sewing pattern selection device 6 is attached to a sewing machine frame (not shown).
a camshaft 10 fixed to the camshaft; a plurality of pattern cams 13 rotatably fitted onto the camshaft via a gear mechanism 12 in conjunction with an upper shaft 11 rotatably supported on the sewing machine frame; An amplitude follower 15 is screwed onto a feed screw shaft 14 disposed parallel to the cam shaft 10 and selectively engages with the pattern cam 13, and a dial shaft (not shown) rotatably supported on the sewing machine frame. ) is provided with a pattern selection dial 16, which is an example of an operating member. When the pattern selection dial 16 is rotated, the ratchet wheels 17 fixed to the dial shaft and the feed screw shaft 14, respectively, and the belt 1 mounted on these ratchet wheels
The feed screw shaft 14 is rotated via 8, and the amplitude follower 15 moves in the axial direction to selectively engage the pattern cam 13. The swing motion of the amplitude follower 15 imparts swing motion to a needle bar (not shown) via the swing rod 19.
上糸張力調節装置７は、ミシン機枠に固着され
た糸調子軸２０に装着された糸調子機構２１、糸
調子軸２０と平行に、ミシン機枠に固着された固
定軸２２に嵌挿された一対の糸調子皿２３、中間
部を枢軸２４によつてミシン機枠に枢着された調
節部材２５及び一端を枢軸２６によつてミシン機
枠に枢着された糸調子レバー２７とを備えてい
る。 The needle thread tension adjustment device 7 includes a thread tension mechanism 21 attached to a thread tension shaft 20 fixed to the sewing machine frame, and a fixed shaft 22 fixed to the sewing machine frame in parallel with the thread tension shaft 20. A pair of thread tension discs 23, an adjusting member 25 whose intermediate portion is pivotally connected to the sewing machine frame by a pivot 24, and a thread tension lever 27 whose one end is pivotally connected to the sewing machine frame by a pivot 26. ing.
糸調子機構２１は糸調子軸２０のねじ部２０ａ
上部に螺着された糸調子ダイヤル３０と、糸調子
軸２０のねじ部２０ａ下部に嵌挿され且つ糸調子
レバー２７に遊嵌された糸調子リング３１と、糸
調子レバー２７と糸調子ダイヤル３０との間に糸
調子軸２０に巻装された第１の糸調子ばね３２
と、糸調子ダイヤル３０と糸調子リング３１との
間に糸調子軸２０に巻装された第１の糸調子ばね
３２よりばね常数の小さい第２の糸調子ばね３３
とを備えている。また糸調子レバー２７は糸ゆる
めレバー３５によつて枢軸２６を中心として矢印
Ａの方向に揺動する如くなつている。 The thread tension mechanism 21 is a threaded portion 20a of the thread tension shaft 20.
A thread tension dial 30 screwed onto the upper part, a thread tension ring 31 fitted into the lower part of the threaded part 20a of the thread tension shaft 20 and loosely fitted to the thread tension lever 27, the thread tension lever 27 and the thread tension dial 30. The first thread tension spring 32 is wound around the thread tension shaft 20 between
and a second thread tension spring 33 having a smaller spring constant than the first thread tension spring 32 wound around the thread tension shaft 20 between the thread tension dial 30 and the thread tension ring 31.
It is equipped with Further, the thread tension lever 27 is configured to swing in the direction of arrow A about a pivot shaft 26 by a thread loosening lever 35.
調節部材２５の一端に形成された従動子２５ａ
は、ダイヤル軸に固着された第１の調節カム３６
に図示しないばねによつて圧接係合しており、他
端２５ｂは糸調子リング３１の下方の糸調子軸２
０に遊嵌している。 A follower 25a formed at one end of the adjustment member 25
is the first adjustment cam 36 fixed to the dial shaft.
The other end 25b is connected to the thread tension shaft 2 below the thread tension ring 31 by a spring (not shown).
It is loosely fitted to 0.
下糸引出し調節装置８は、下糸引出し部材の一
例たる送り歯３８と、下糸制御部材３９と、調節
機構４０とを備えており、送り歯３８はミシン機
枠に揺動自在に支承された水平送り軸４３に一端
を枢着された送り台４５に固着されている。また
送り歯３８には下糸引出し部３８ａが形成されて
いる。下糸制御部材３９は一端がミシン機枠に枢
軸４６によつて枢着され他端が送り歯３８の下糸
引出し部３８ａに対向し得る如く下方に配設され
ている。 The bobbin thread drawer adjustment device 8 includes a feed dog 38, which is an example of a bobbin thread drawer member, a bobbin thread control member 39, and an adjustment mechanism 40. The feed dog 38 is swingably supported on the sewing machine frame. It is fixed to a feed base 45 whose one end is pivotally connected to a horizontal feed shaft 43. Further, the feed dog 38 is formed with a lower thread pull-out portion 38a. The bobbin thread control member 39 has one end pivotally attached to the sewing machine frame by a pivot 46, and the other end is disposed below so as to be opposed to the bobbin thread pull-out portion 38a of the feed dog 38.
調節機構４０は第１の調節レバー４７、第２の
調節レバー４８、連結リンク４９及び第２の調節
カム５０とを備えており、第１の調節レバー４７
は中間部をミシン機枠に枢軸５１によつて枢着さ
れ、一端に形成された従動子４７ａを下糸制御部
材３９の裏面に係合させている。第２の調節レバ
ー４８は中間部をミシン機枠に枢軸５２によつて
枢着され、一端に形成された従動子４８ａがダイ
ヤル軸に固着された第２の調節カム５０に図示し
ないばねによつて圧接係合している。連結リンク
４９の他端は第１の調節レバー４７の他端及び第
２の調節レバー４８の他端にピン５５によつて枢
着されている。 The adjustment mechanism 40 includes a first adjustment lever 47, a second adjustment lever 48, a connecting link 49, and a second adjustment cam 50.
The intermediate portion is pivotally connected to the sewing machine frame by a pivot 51, and a follower 47a formed at one end is engaged with the back surface of the bobbin thread control member 39. The second adjustment lever 48 has an intermediate portion pivotally connected to the sewing machine frame by a pivot 52, and a follower 48a formed at one end is connected to a second adjustment cam 50 fixed to a dial shaft by a spring (not shown). They are press-fitted together. The other end of the connecting link 49 is pivotally connected to the other end of the first adjustment lever 47 and the other end of the second adjustment lever 48 by a pin 55.
第４図に破線で示す水平釜５６は、送り歯３８
の下方に配置されており、ミシン機枠に回動自在
に支承された下軸５７に連動して歯車機構５８を
介して回動し得る如くなつている。 The horizontal hook 56 shown in broken lines in FIG.
It is arranged below the sewing machine frame and can be rotated via a gear mechanism 58 in conjunction with a lower shaft 57 rotatably supported on the sewing machine frame.
本発明は上記のように構成されており、以下そ
の作用について説明する。第６図に示すように送
り歯３８の一部に下糸引出し部３８ａを形成した
ことにより、該下糸引出し部が送り歯３８の上下
運動及び水平運動の合成運動により第７図及び第
８図に破線で示すように運動することにより下糸
２の引出し及び引締めを行つている。なお同図に
おいて、７５は公知の針板である。 The present invention is constructed as described above, and its operation will be explained below. As shown in FIG. 6, by forming the bobbin thread pull-out portion 38a in a part of the feed dog 38, the bobbin thread pull-out portion is moved as shown in FIGS. The bobbin thread 2 is pulled out and tightened by moving as shown by the broken line in the figure. In addition, in the same figure, 75 is a publicly known throat plate.
一般に上糸１と下糸２の縫目の交差点Ｐに対す
る上糸張力の関係は、第９図に線図で縦軸に縫目
の交差点Ｐ位置、横軸に上糸張力をとつて示す如
く、例えばＵを上布の上面、Ｍを上下布の合わせ
面、Ｌを下布の下面とすると、上下の糸張力の低
い場合の曲線はＥとなり、上下の糸張力の高い場
合の曲線はＧとなる。同図から分るように、曲線
Ｅで示す低い上糸張力ではＦ点で適正交差が得ら
れ、曲線Ｇで示す高い上糸張力ではF′点で適正交
差が得られることを示している。また曲線Ｅ，Ｇ
は下糸張力に変えて下糸２の引出し量、即ち第７
図における下糸引出し部３８ａのストローク△に
よつても類似的に決定することができ、ストロー
ク△の小さいほど、即ち引出し量の小さいほど高
い下糸張力が与えられ交差することが実験の結果
明らかとなつている。 Generally, the relationship between the needle thread tension and the intersection point P of the stitches of needle thread 1 and bobbin thread 2 is shown in a diagram in Figure 9, where the vertical axis is the stitch intersection point P and the horizontal axis is the needle thread tension. For example, if U is the upper surface of the upper fabric, M is the mating surface of the upper and lower fabrics, and L is the lower surface of the lower fabric, the curve when the upper and lower thread tensions are low is E, and the curve when the upper and lower thread tensions are high is G. becomes. As can be seen from the figure, when the needle thread tension is low as shown by curve E, proper intersection is obtained at point F, and when the needle thread tension is high as shown by curve G, proper intersection is obtained at point F'. Also, curves E and G
is the amount of pull-out of the bobbin thread 2 instead of the bobbin thread tension, that is, the seventh
It can be similarly determined by the stroke △ of the bobbin thread pull-out portion 38a in the figure, and it is clear from experiments that the smaller the stroke △, that is, the smaller the amount of pull-out, the higher the bobbin thread tension is applied and the crossing occurs. It is becoming.
本発明は、このストローク△が同一であつて
も、下糸制御部材３９の位置を変えることによつ
て、実質的に下糸引出し量を変えられるようにし
たものである。即ち、第７図に示す如く、下糸制
御部材３９が上死点にあるときは、天秤上死点付
近における下糸２は下糸引出し部３８ａの上下運
動によつて十分に引き出されるが、第８図に示す
如く、下死点にあるときは殆ど下糸２の引き出し
はない。このように下糸制御部材３９の位置を変
えることによつて天秤上死点付近における下糸２
の引出し量が変化し下糸の糸締め効果が実質的に
変化するものである。 In the present invention, even if the stroke Δ remains the same, by changing the position of the bobbin thread control member 39, the amount of the bobbin thread pulled out can be substantially changed. That is, as shown in FIG. 7, when the bobbin thread control member 39 is at the top dead center, the bobbin thread 2 near the top dead center of the thread take-up is sufficiently pulled out by the vertical movement of the bobbin thread pull-out portion 38a; As shown in FIG. 8, the bobbin thread 2 is hardly pulled out when it is at the bottom dead center. By changing the position of the bobbin thread control member 39 in this way, the bobbin thread 2 near the top dead center of the thread take-up can be adjusted.
The amount of pull-out changes, and the thread tightening effect of the bobbin thread changes substantially.
第４図において、模様選択ダイヤル１６を回転
して適宜な縫模様を選択すると、爪車１７及びベ
ルト１８を介して送りねじ軸１４が回転すると共
に振幅用従動子１５が軸方向に移動し模様カム１
３に選択的に係合し振幅ロツド１９を介して針棒
に揺動運動を付与する。同時に第２の調節レバー
４８は従動子４８ａを介して揺動し、第１の調節
レバー４７が連結リンク４９を介して枢軸５１を
中心として揺動する。すると第１の調節レバー４
７の従動子４７ａによつて制御部材３９は枢軸４
６を中心として移動し一定位置に停止する。これ
によつて第７図及び第８図において説明したよう
に、下糸２の引出し量が変化し下糸の糸締め効果
が実質的に変化する。 In FIG. 4, when the pattern selection dial 16 is rotated to select an appropriate sewing pattern, the feed screw shaft 14 is rotated via the ratchet wheel 17 and the belt 18, and the amplitude follower 15 is moved in the axial direction. cam 1
3 to impart swinging motion to the needle bar via the amplitude rod 19. At the same time, the second adjustment lever 48 swings via the follower 48a, and the first adjustment lever 47 swings about the pivot shaft 51 via the connecting link 49. Then, the first adjustment lever 4
The control member 39 is moved to the pivot shaft 4 by the follower 47a of 7.
6 and stops at a certain position. As a result, as explained in FIGS. 7 and 8, the amount of pull-out of the bobbin thread 2 changes, and the thread tightening effect of the bobbin thread substantially changes.
一方、調節部材２５は従動子２５ａを介して枢
軸２４を中心として揺動し、他端２５ｂによつて
糸調子リング３１を押圧し得る如くなり、該糸調
子リングが上方に移動すると、糸調子レバー２７
に付与されるばね圧は第１の糸調子ばね３２だけ
となり、一対の糸調子皿２３間に挾持された上糸
１に付与される張力、即ち上糸張力が変化する。
このように模様選択ダイヤル１６を適宜回転させ
て縫模様を選択した場合、第１の調節カム３６及
び第２の調節カム５０の形状を縫目の種類に応じ
て設定しておくことにより、上糸１と下糸２の交
差点Ｐの位置が最も適正となるようにすることが
でき、常に理想的な縫目が得られる。そして、あ
る特定の縫いに対して糸調子ダイヤル３０を回動
操作して予め上糸張力を調節しておくことによ
り、他の縫いに対しては自動的に第２の糸調子ば
ね３３の作動、不作動により最も望ましい縫目が
得られる。 On the other hand, the adjusting member 25 swings about the pivot shaft 24 via the follower 25a, and can press the thread tension ring 31 with the other end 25b. When the thread tension ring moves upward, the thread tension Lever 27
The spring pressure applied to only the first thread tension spring 32 changes the tension applied to the needle thread 1 held between the pair of thread tension discs 23, that is, the needle thread tension.
When a sewing pattern is selected by appropriately rotating the pattern selection dial 16 in this way, the shape of the first adjustment cam 36 and the second adjustment cam 50 can be set according to the type of stitches. The position of the intersection point P between the thread 1 and the bobbin thread 2 can be set to be the most appropriate, and ideal stitches can always be obtained. By adjusting the needle thread tension in advance by rotating the thread tension dial 30 for a particular stitch, the second thread tension spring 33 is automatically activated for other stitches. , inactivation provides the most desirable seams.
第１０図は本発明の第二実施例を示したもの
で、上下送り軸６０は水平送り軸４３と平行にミ
シン機枠に揺動自在に支承されている。調節カム
６１は上下送り軸６０に摺動自在に嵌挿されてお
り、外周面に形成された螺旋溝６１ａは上下送り
軸６０に植設されたピン６２に嵌入している。ま
た調節カム６１にはカム面６１ｂが形成されてお
り、該カム面には第一実施例の下糸引出し部３８
ａに相当する３８a′を形成した下糸制御部材３
９′の下面が当接しており、調節カム６１に形成
された環状溝６１ｃには枢軸６３によつてミシン
機枠に枢着された揺動リンク６４のピン６５が嵌
入している。そして、該揺動リンクをロツド６６
を介して操作部材１６に連動させて揺動させるこ
とにより、下糸制御部材３９′の運動位相を変え
天秤上死点付近における下糸引出し量及び下糸引
出し位相を変えるようにしたものであり、その他
は第一実施例と同じなので図面に符号を付して説
明は省略する。 FIG. 10 shows a second embodiment of the present invention, in which a vertical feed shaft 60 is swingably supported on a sewing machine frame parallel to a horizontal feed shaft 43. The adjusting cam 61 is slidably inserted into the vertical feed shaft 60, and a spiral groove 61a formed on the outer circumferential surface is fitted into a pin 62 implanted in the vertical feed shaft 60. Further, the adjustment cam 61 is formed with a cam surface 61b, and the bobbin thread pull-out portion 38 of the first embodiment is formed on the cam surface.
Lower thread control member 3 formed with 38a' corresponding to a
A pin 65 of a swing link 64 pivotally connected to the sewing machine frame by a pivot 63 is fitted into an annular groove 61c formed in the adjusting cam 61. Then, the swing link is attached to the rod 66.
By swinging the lower thread control member 39' in conjunction with the operating member 16 through the lower thread lever, the movement phase of the lower thread control member 39' is changed, and the lower thread withdrawal amount and the lower thread withdrawal phase near the top dead center of the thread take-up are changed. , and the rest are the same as the first embodiment, so the reference numerals are attached to the drawings and the explanation is omitted.
第１１図は本発明の第三実施例を示したもの
で、第二実施例と異なり調節カム６１′のカム面
６１b′は円錐状となつており、その他は第一及び
第二実施例と同じなので、図面に符号を付して説
明は省略する。 FIG. 11 shows a third embodiment of the present invention, in which, unlike the second embodiment, the cam surface 61b' of the adjusting cam 61' is conical, and the other features are the same as in the first and second embodiments. Since they are the same, reference numerals are attached to the drawings and description thereof will be omitted.
第１２図は本発明の第四実施例を示したもの
で、針棒振幅及び送りをマイクロコンピユーター
からの信号によつて駆動するパルスモータ７０，
７１で制御するようにしたミシンにおいて、第一
実施例の第１の調節レバー４７をマイクロコンピ
ユータに記憶された信号により駆動する操作部材
の一例たるパルスモータ７２によつてパルスモー
タ７０，７１に同期して１サイクル中の各縫目毎
に適正な下糸の引き出しが行われるようにしたも
のである。その他は第一実施例と同じなので図面
に符号を付して説明は省略する。 FIG. 12 shows a fourth embodiment of the present invention, in which a pulse motor 70 drives the needle bar amplitude and feed by signals from a microcomputer.
71, the first adjustment lever 47 of the first embodiment is controlled in synchronization with the pulse motors 70 and 71 by a pulse motor 72, which is an example of an operating member that drives the first adjustment lever 47 in accordance with a signal stored in a microcomputer. The lower thread is drawn out appropriately for each stitch in one cycle. Since the rest is the same as the first embodiment, reference numerals are attached to the drawings and explanations thereof will be omitted.
（効果）
本発明は上記の如く構成され、作用するもので
あるから、上糸張力及び下糸張力に関係のある天
秤上死点付近における下糸の引出し量が操作部材
の操作に連動して調節することができるので、各
種の縫いの種類に応じて最も望ましい縫目が得ら
れるという効果がある。またある特定の縫いに対
して最も望ましい縫目が得られるように予め調節
しておくことだけで、他の縫いに対しても自動的
に最も望ましい縫目が得られるという効果があ
る。(Effects) Since the present invention is constructed and operates as described above, the amount of bobbin thread pulled out near the top dead center of the thread take-up, which is related to the needle thread tension and the bobbin thread tension, is linked to the operation of the operating member. Since it can be adjusted, the most desirable stitches can be obtained depending on the type of stitching. Furthermore, by simply making adjustments in advance so that the most desirable stitches can be obtained for a particular stitch, there is an effect that the most desirable stitches can be automatically obtained for other stitches as well.
第１図は本縫ミシンにおける直線縫目の交差状
態を示す斜視図、第２図及び第３図は夫々本縫ミ
シンにおけるジグザグ縫目の交差状態を示す斜視
図、第４図から第６図は本発明の第一実施例を示
したもので、第４図は本発明に係る装置の要部を
示す斜視図、第５図は糸調子機構を示す縦断面
図、第６図は送り歯と下糸制御部材との関係を示
す斜視図、第７図及び第８図は夫々送り歯の下糸
引出し部と下糸制御部材との関係を一部断面で示
す側面図、第９図は縫目交差位置と上糸張力との
関係を示す線図、第１０図、第１１図及び第１２
図は夫々本発明の第二実施例、第三実施例及び第
四実施例の下糸引出し調節装置の要部を示す斜視
図である。
図中、２は下糸、７は上糸張力調節装置、８は
下糸引出し調節装置、１６は操作部材の一例たる
模様選択ダイヤル、２３は糸調子皿、３２，３３
は夫々糸調子ばね、３８は下糸引出し部材の一例
たる送り歯、３９は下糸制御部材、５６は釜機構
の一部たる水平釜である。
Fig. 1 is a perspective view showing the intersecting state of straight stitches in a lockstitch sewing machine, Figs. 2 and 3 are perspective views showing intersecting states of zigzag stitches in the lockstitch sewing machine, and Figs. 4 to 6 respectively. 4 shows a first embodiment of the present invention, FIG. 4 is a perspective view showing the main parts of the device according to the invention, FIG. 5 is a longitudinal sectional view showing the thread tension mechanism, and FIG. 6 is a feed dog. FIGS. 7 and 8 are side views showing the relationship between the bobbin thread control member and the bobbin thread pull-out portion of the feed dog, respectively, partially in section, and FIG. Diagrams showing the relationship between stitch intersection position and needle thread tension, Figures 10, 11, and 12
The figures are perspective views showing essential parts of the bobbin thread pull-out adjusting device of the second embodiment, the third embodiment, and the fourth embodiment of the present invention, respectively. In the figure, 2 is a lower thread, 7 is an upper thread tension adjustment device, 8 is a lower thread pull-out adjustment device, 16 is a pattern selection dial which is an example of an operating member, 23 is a thread tension disc, 32, 33
38 is a thread tension spring, 38 is a feed dog which is an example of a bobbin thread pull-out member, 39 is a bobbin thread control member, and 56 is a horizontal hook which is a part of the hook mechanism.
Claims (1)
い目形成毎に釜機構より下糸を引き出すように作
動する下糸引出し部材と、該下糸引出し部材と前
記釜機構との間で下糸引出し部材との上下方向の
相対位置が調節され得ように配設され操作部材の
操作に連動して下糸引出し部材との相対位置を変
更せしめられ前記釜機構からの下糸引出し量を制
御する下糸制御部材とでなる下糸引出し調節装置
を設けたことを特徴とする本縫ミシンにおける縫
目調節装置。 ２ 針板と釜機構との間で上下運動せしめられ縫
い目形成毎に釜機構より下糸を引き出すように作
動する下糸引出し部材と、該下糸引出し部材と前
記釜機構との間で下糸引出し部材との上下方向の
相対位置が調節され得るように配設され操作部材
の操作に連動して下糸引出し部材との相対位置を
変更せしめられ前記釜機構からの下糸引出し量を
制御する下糸制御部材とでなる下糸引出し調節装
置と、一対の糸調子皿に上糸張力を付与する２本
の糸調子ばねのうちの１本を前記操作部材に連動
して作動と不作動の状態に切り替えることができ
る上糸張力調節装置とを設けたことを特徴とする
本縫ミシンにおける縫目調節装置。[Scope of Claims] 1. A bobbin thread pull-out member that is moved up and down between the throat plate and the hook mechanism and operates to pull out the bobbin thread from the hook mechanism each time a stitch is formed; the bobbin thread pull-out member and the hook mechanism; The vertical position relative to the bobbin thread pull-out member can be adjusted between the hook mechanism and the bobbin thread pull-out member. 1. A stitch adjustment device for a lockstitch sewing machine, comprising a bobbin thread draw-out adjustment device comprising a bobbin thread control member that controls the amount of thread drawn out. 2. A bobbin thread pull-out member that is moved up and down between the throat plate and the hook mechanism and operates to pull out the bobbin thread from the hook mechanism each time a stitch is formed; The bobbin thread pull-out member is arranged so that its vertical position relative to the pull-out member can be adjusted, and its relative position with the bobbin thread pull-out member is changed in conjunction with the operation of the operating member, thereby controlling the amount of bobbin thread drawn out from the hook mechanism. A lower thread pull-out adjustment device consisting of a lower thread control member and one of two thread tension springs that apply upper thread tension to a pair of thread tension discs are activated and deactivated in conjunction with the operating member. What is claimed is: 1. A stitch adjustment device for a lockstitch sewing machine, comprising: a needle thread tension adjustment device that can be switched to a different state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14557981A JPS5846987A (en) | 1981-09-17 | 1981-09-17 | Stitch adjusting apparatus in main stitch seweing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14557981A JPS5846987A (en) | 1981-09-17 | 1981-09-17 | Stitch adjusting apparatus in main stitch seweing machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5846987A JPS5846987A (en) | 1983-03-18 |
| JPH0228353B2 true JPH0228353B2 (en) | 1990-06-22 |
Family
ID=15388355
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14557981A Granted JPS5846987A (en) | 1981-09-17 | 1981-09-17 | Stitch adjusting apparatus in main stitch seweing machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5846987A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0632739B2 (en) * | 1985-09-20 | 1994-05-02 | ジャガー株式会社 | Lower thread loosening mechanism of zigzag sewing machine |
| JPS6274399A (en) * | 1985-09-27 | 1987-04-06 | 蛇の目ミシン工業株式会社 | Bobbin thread path altering apparatus of sewing machine |
| JPS63233169A (en) * | 1987-03-18 | 1988-09-28 | 日精株式会社 | Multilayer horizontal recirculation type parking equipment |
| JP5854478B2 (en) * | 2013-02-25 | 2016-02-09 | 株式会社友縫機械 | Lower thread feeding device for sewing device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS419542Y1 (en) * | 1964-06-08 | 1966-05-09 |
-
1981
- 1981-09-17 JP JP14557981A patent/JPS5846987A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS419542Y1 (en) * | 1964-06-08 | 1966-05-09 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5846987A (en) | 1983-03-18 |
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