JP2019170707A - Needle bar drive mechanism for sewing machine - Google Patents

Needle bar drive mechanism for sewing machine Download PDF

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JP2019170707A
JP2019170707A JP2018062678A JP2018062678A JP2019170707A JP 2019170707 A JP2019170707 A JP 2019170707A JP 2018062678 A JP2018062678 A JP 2018062678A JP 2018062678 A JP2018062678 A JP 2018062678A JP 2019170707 A JP2019170707 A JP 2019170707A
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needle bar
shaft
sewing machine
arm
head
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俊雄 千賀
Toshio Chiga
俊雄 千賀
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Pegasus Co Ltd
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Pegasus Sewing Machine Manufacturing Co Ltd
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Priority to JP2018062678A priority Critical patent/JP2019170707A/en
Priority to TW108103061A priority patent/TW201942438A/en
Priority to CN201910135788.XA priority patent/CN110318174A/en
Publication of JP2019170707A publication Critical patent/JP2019170707A/en
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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B55/00—Needle holders; Needle bars
    • D05B55/14—Needle-bar drives

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)

Abstract

To provide a needle bar drive mechanism for sewing machine capable of sufficiently securing marginal height from a bed upper surface to an arm lower surface without making the length of a needle bar long.SOLUTION: A needle bar drive mechanism 27 of a sewing machine 21 includes: a vertical movement mechanism 31 for converting the rotational movement of a needle bar shaft 30 into vertical reciprocating drive of a needle bar 26; and a frontward/backward movement mechanism 32 for converting the rotational movement of an upper shaft 29 into frontward/backward reciprocating drive of the needle bar 26. The upper shaft 29 and the needle bar shaft 30 are horizontally arranged in a head 25 and supported in a rotatable manner respectively. The needle bar shaft 30 is arranged further downward than the upper shaft 29, and a timing belt 42 is stretched across a toothed pulley 40 fixed to the upper shaft 29 and a toothed pulley 41 fixed to the needle bar shaft 30. With this constitution, since the vertical position of an arm 24 can be set according to the vertical position of the upper shaft 29 and the length of the timing belt 42, the marginal height from a bed upper surface to the arm 24 lower surface can be sufficiently secured without making the length of the needle bar 26 long.SELECTED DRAWING: Figure 1

Description

本発明は、ミシンとりわけ針送りミシンの針棒駆動機構に関する。
本発明において、前後とはミシンの生地送り方向における前後方向をいい、左右とはミシンを正面から見た時の左右方向をいう。また上下とはミシンの上下方向をいう。 The present invention relates to a needle bar drive mechanism for a sewing machine, particularly a needle feed sewing machine.
In the present invention, front and rear refer to the front and rear direction in the cloth feed direction of the sewing machine, and left and right refer to the left and right direction when the sewing machine is viewed from the front. The up and down direction means the up and down direction of the sewing machine.

従来、ミシンの針棒駆動機構として、針棒に上下動を伝達する上下動機構と針棒に前後動を伝達する前後動機構を備えたものがある（例えば、特許文献１）。図４は特許文献１に開示された従来の針棒駆動機構を備えたミシンの正面図である。
図４に示すように、ミシン１はベッド（基板）２ａ，柱部（柱体）２ｂと、ベッド２ａから上方に延びる脚柱部（スタンド）３と、脚柱部３からベッド２ａと対向して延びるアーム４と、アーム４の先端に連設されるヘッド５とを有する。ヘッド５には上下動および前後動可能に針棒６が設けられ、針棒６は下端に針１４を保持する。
針棒６に上下動を伝達する上下動機構は、アーム４内において水平配置されアーム４に支持される上軸８と、ヘッド５内に突出する上軸８の端部に連結されるモーションクランク（クランク）９と、モーションクランク９に上端が連結されるリンク（連結棒）１０と、リンク１０の下端に連結されるホルダ（枢着結合部）とを備える。針棒６はその中途にホルダが取り付けられ、上軸８の回転によって上下動する。
針棒６に前後動を伝達する前後動機構は、アーム４内において上軸８より下方にて水平配置されアーム４に支持される揺動軸１２と、ヘッド５内に突出する揺動軸１２の端部に固定される揺動腕１３とを備える。揺動腕１３は針棒６とホルダとの連結部を挟むように上下２位置で針棒６を支持している。揺動軸１２の回動によって揺動腕１３が揺動軸１２中心に揺動し針棒６は前後動する。 2. Description of the Related Art Conventionally, as a needle bar driving mechanism of a sewing machine, there is one provided with a vertical movement mechanism that transmits vertical movement to a needle bar and a front-rear movement mechanism that transmits front and back movement to a needle bar (for example, Patent Document 1). FIG. 4 is a front view of a sewing machine provided with a conventional needle bar driving mechanism disclosed in Patent Document 1. As shown in FIG.
As shown in FIG. 4, the sewing machine 1 is opposed to a bed (substrate) 2a, a column part (column body) 2b, a leg column part (stand) 3 extending upward from the bed 2a, and the leg column part 3 to the bed 2a. And an arm 4 that extends and a head 5 that is connected to the tip of the arm 4. The head 5 is provided with a needle bar 6 that can move up and down and back and forth, and the needle bar 6 holds a needle 14 at the lower end.
The vertical movement mechanism that transmits the vertical movement to the needle bar 6 is a motion crank that is horizontally disposed in the arm 4 and supported by the arm 4, and a motion crank that is coupled to the end of the upper shaft 8 that protrudes into the head 5. (Crank) 9, a link (connecting rod) 10 whose upper end is connected to motion crank 9, and a holder (pivot joint) connected to the lower end of link 10. The needle bar 6 has a holder attached in the middle thereof, and moves up and down by the rotation of the upper shaft 8.
The longitudinal movement mechanism that transmits the longitudinal movement to the needle bar 6 includes a swing shaft 12 that is horizontally disposed below the upper shaft 8 in the arm 4 and supported by the arm 4, and a swing shaft 12 that protrudes into the head 5. And an oscillating arm 13 fixed to the end. The swing arm 13 supports the needle bar 6 at two positions, upper and lower, so as to sandwich the connecting portion between the needle bar 6 and the holder. As the swing shaft 12 rotates, the swing arm 13 swings about the swing shaft 12 and the needle bar 6 moves back and forth.

上述のように構成された従来のミシン１の針棒駆動機構７では、柱部２ｂ上面に積載された生地は針棒駆動機構７により生地送り方向に送られながら、針１４，図示しないルーパ等々の各部材が協働して縫製が行なわれる。特許文献１に開示されるミシンは、主に立体形状の被縫製物に縫い目を形成するのに用いられる。   In the conventional needle bar drive mechanism 7 of the sewing machine 1 configured as described above, the fabric stacked on the upper surface of the column portion 2b is fed in the fabric feed direction by the needle bar drive mechanism 7, while the needle 14, the looper (not shown), and the like. Each member of the above works together for sewing. The sewing machine disclosed in Patent Document 1 is mainly used to form a seam on a three-dimensionally shaped workpiece.

特表平４−５０４９５８号公報（第１図、第２図）JP-T-4-504958 (FIGS. 1 and 2)

従来のミシン１を用いて縫製を行なう場合、上述したように立体形状の被縫製物を取り扱うことが多い。被縫製物の立体形状は種々あり、中には上下に長尺のものもある。したがって、従来のミシン１を用いて縫製する場合、被縫製物の形状によっては、被縫製物がアーム４の下面やベッド２ａの上面に接触するなどして、縫製の作業性が損なわれる可能性があった。   When sewing is performed using the conventional sewing machine 1, a three-dimensional sewing object is often handled as described above. There are various three-dimensional shapes of the sewing object, and some are long in the vertical direction. Therefore, when sewing using the conventional sewing machine 1, depending on the shape of the sewing product, the sewing workability may be impaired due to the sewing product contacting the lower surface of the arm 4 or the upper surface of the bed 2a. was there.

上記問題を解決するためには、ベッド２ａ上面からアーム４下面までの懐高さを十分に確保する必要がある。その解決手段の一案として、従来ミシン１における脚柱部３を上方に延ばし、上下動機構と前後動機構からなる針棒駆動機構７の構成を変更することなくアーム４と共に従来ミシン１より上方に位置させ、かつ針棒６を従来ミシン１のものより長く設定することが考えられる。しかしながら、針棒を長尺化すると、針棒の製造難易度の上昇、加工面・材料面によるコストアップが生じる。また、針棒駆動時の針棒の慣性力が大きくなることにより針棒のオーバーランが発生し、その結果、部品耐久性の低下や縫製品質の低下などの問題が生じるおそれがある。さらに、上述の問題は針棒が長くなれば長くなるほど深刻度を増す。   In order to solve the above problem, it is necessary to secure a sufficient height from the upper surface of the bed 2a to the lower surface of the arm 4. As one solution to this problem, the leg column 3 of the conventional sewing machine 1 is extended upward, and the arm 4 and the conventional sewing machine 1 are moved upward together with the arm 4 without changing the configuration of the needle bar drive mechanism 7 composed of a vertical movement mechanism and a longitudinal movement mechanism. And the needle bar 6 can be set longer than that of the conventional sewing machine 1. However, if the needle bar is elongated, the manufacturing difficulty of the needle bar increases, and the cost increases due to the processed surface and material surface. In addition, the needle bar overrun occurs when the needle bar's inertial force increases when the needle bar is driven. As a result, there is a possibility that problems such as a decrease in component durability and a decrease in quality of the sewing product may occur. Furthermore, the above problem becomes more serious as the needle bar becomes longer.

したがって、本発明の課題は、針棒の長さを長尺化することなく、ベッド上面からアーム下面までの懐高さを十分に確保できるミシンの針棒駆動機構を提供することにある。   Accordingly, an object of the present invention is to provide a needle bar drive mechanism for a sewing machine that can sufficiently secure a height from a bed upper surface to an arm lower surface without increasing the length of the needle bar.

上記目的を達成するために、本発明のミシンの針棒駆動機構は、
上方に延びる脚柱部と、
前記脚柱部から水平方向に延びるアームと、
前記アームの先端に連設されるヘッドと、
前記ヘッドに設けられ下端に針を保持する針棒と、
前記ヘッド内に水平配置され回転可能に支持される上軸と、
前記ヘッド内に前記上軸より下方にて水平配置され回転可能に支持される針棒軸と、
前記上軸の回転運動を前記針棒軸に伝達する伝達機構と、
前記針棒軸の回転運動を前記針棒の上下往復駆動に変換する上下動機構と、
前記上軸の回転運動を前記針棒の前後往復駆動に変換する前後動機構と、
を備えることを特徴とする。 In order to achieve the above object, the needle bar drive mechanism of the sewing machine of the present invention comprises:
A pedestal that extends upward;
An arm extending horizontally from the pedestal, and
A head connected to the tip of the arm;
A needle bar provided on the head and holding a needle at the lower end;
An upper shaft horizontally disposed in the head and rotatably supported;
A needle bar shaft horizontally disposed below the upper shaft in the head and rotatably supported;
A transmission mechanism for transmitting the rotational movement of the upper shaft to the needle bar shaft;
A vertical movement mechanism that converts the rotational movement of the needle bar shaft into the vertical reciprocating drive of the needle bar;
A back-and-forth movement mechanism that converts the rotational movement of the upper shaft into a back-and-forth reciprocating drive of the needle bar;
It is characterized by providing.

なお、前記伝達機構は、前記上軸と前記針棒軸にそれぞれ設けられた歯付きプーリーと、これら歯付きプーリーに掛け渡されたタイミングベルトとから構成されていることが望ましい。   The transmission mechanism is preferably composed of a toothed pulley provided on each of the upper shaft and the needle bar shaft, and a timing belt stretched around the toothed pulley.

さらに、前記前後動機構は、
前記上軸に設けられる偏心部と、
一端が前記偏心部に連結されるロッドと、
前記ロッドの他端に連結される第１クランクと、
前記上軸より下方にて水平配置されるとともに回転可能に支持され前記第１クランクが連結する回動軸と、
前記回動軸に連結される第２クランクと、
前記第２クランクに連結されるリンクと、
前記リンクに連結され上下２位置で前記針棒を支持する揺動腕とを備え、
前記揺動腕は左右に軸部をそれぞれ設け、前記両軸部は回転可能に前記ヘッドに支持されていることが望ましい。 Further, the back and forth mechanism is
An eccentric portion provided on the upper shaft;
A rod having one end connected to the eccentric part;
A first crank connected to the other end of the rod;
A rotating shaft that is horizontally disposed below the upper shaft and is rotatably supported and connected to the first crank;
A second crank coupled to the pivot shaft;
A link connected to the second crank;
A swinging arm connected to the link and supporting the needle bar in two vertical positions;
It is desirable that the swing arm is provided with shaft portions on the left and right sides, and both shaft portions are supported by the head to be rotatable.

本発明のミシンの針棒駆動機構によれば、針棒の長さを長尺化することなく、ベッド上面からアーム下面までの懐高さを十分に確保できる。つまり、針棒の長さを長尺化することがないので、上述のような針棒の長尺化による問題は発生しない。また、ベッド上面からアーム下面までの懐高さを十分に確保できるので、上下に長尺の立体形状からなる被縫製物を縫製する場合であっても、縫製の作業性が損なわれることはない。さらに、針棒の前後動機構における揺動腕を従来ミシンの片持ち構造からヘッドの左右で支持する両持ち構造としたので、針棒駆動機構は安定性を増す。   According to the needle bar drive mechanism of the sewing machine of the present invention, it is possible to sufficiently secure the height from the bed upper surface to the arm lower surface without increasing the length of the needle bar. That is, since the length of the needle bar is not lengthened, the problem due to the lengthening of the needle bar as described above does not occur. In addition, since the pocket height from the upper surface of the bed to the lower surface of the arm can be sufficiently secured, the sewing workability is not impaired even when sewing a sewing object having a long three-dimensional shape up and down. . Further, since the swing arm of the needle bar back-and-forth movement mechanism is changed from the conventional cantilever structure of the sewing machine to the left and right sides of the head, the needle bar drive mechanism is more stable.

本発明に係る針棒駆動機構を備えたミシンの概略正面図。The schematic front view of the sewing machine provided with the needle bar drive mechanism concerning the present invention. 針棒駆動機構の斜視図。The perspective view of a needle bar drive mechanism. 針棒駆動機構の要部を拡大した部分断面正面図。The fragmentary sectional front view which expanded the principal part of the needle bar drive mechanism. 従来の針棒駆動機構を備えたミシンの概略正面図。The schematic front view of the sewing machine provided with the conventional needle bar drive mechanism.

以下、本発明に係るミシン２１の針棒駆動機構２７について詳細に説明する。図１は針棒駆動機構２７を備えたミシン２１の正面図で、ミシン２１のフレームを形成するベッドや柱部２２，脚柱部２３の一部を省略している。図２は針棒駆動機構２７の斜視図、図３は針棒駆動機構２７の揺動腕５１近傍を拡大し部分断面にした正面図である。なお、図２に示す記号Ｆは生地送り方向を表している。また、図３は針棒駆動機構２７の構成を一部省略している。
ミシン２１は、上方に延びる脚柱部２３と、脚柱部２３の上部から水平方向に延びるアーム２４と、アーム２４の先端に連設されるヘッド２５と、ヘッド２５の下方に立設する柱部２２を備えている。ヘッド２５内およびアーム２４内には上軸２９が左右に延びて水平配置され、ヘッド２５およびアーム２４に回転可能に支持されている。さらに、ヘッド２５内には針棒軸３０が上軸２９より下方にて左右に延びて水平配置され、ヘッド２５に回転可能に支持されている。針棒駆動機構２７は上軸２９の回転運動を針棒軸３０に伝達する伝達機構を備える。伝達機構は、上軸２９の中途に固定される歯付きプーリー４０と、針棒軸３０の中途に固定される歯付きプーリー４１と、歯付きプーリー４０と歯付きプーリー４１とに掛け渡されたタイミングベルト４２とから構成される。 Hereinafter, the needle bar drive mechanism 27 of the sewing machine 21 according to the present invention will be described in detail. FIG. 1 is a front view of a sewing machine 21 provided with a needle bar drive mechanism 27, and a bed, a column part 22, and a part of a leg column part 23 forming a frame of the sewing machine 21 are omitted. 2 is a perspective view of the needle bar drive mechanism 27, and FIG. 3 is an enlarged front view of the vicinity of the swing arm 51 of the needle bar drive mechanism 27. In addition, the symbol F shown in FIG. 2 represents the cloth feeding direction. In FIG. 3, a part of the configuration of the needle bar drive mechanism 27 is omitted.
The sewing machine 21 includes a leg column portion 23 extending upward, an arm 24 extending in the horizontal direction from the upper portion of the leg column portion 23, a head 25 connected to the tip of the arm 24, and a column standing below the head 25. A portion 22 is provided. An upper shaft 29 extends horizontally in the head 25 and the arm 24 and is horizontally disposed, and is rotatably supported by the head 25 and the arm 24. Further, a needle bar shaft 30 is horizontally disposed in the head 25 so as to extend left and right below the upper shaft 29 and is rotatably supported by the head 25. The needle bar drive mechanism 27 includes a transmission mechanism that transmits the rotational motion of the upper shaft 29 to the needle bar shaft 30. The transmission mechanism was spanned between a toothed pulley 40 fixed in the middle of the upper shaft 29, a toothed pulley 41 fixed in the middle of the needle bar shaft 30, and the toothed pulley 40 and the toothed pulley 41. And a timing belt 42.

ヘッド２５には針棒２６が上下動および前後動可能に配置されている。針棒２６は上下に延びて配置されヘッド２５下面より突出する下端に針２８を保持している。針棒駆動機構２７は、針棒軸３０の回転運動を針棒２６の上下往復駆動に変換する上下動機構３１と、上軸２９の回転運動を針棒２６の前後往復駆動に変換する前後動機構３２とを備える。上下動機構３１は、針棒軸３０の一端に固定されるモーションクランク３４と、モーションクランク３４と図示しない偏心ピンで連結されるリンク３５と、針棒６の中途に取り付けられ且つリンク３５に連結されるホルダ３６とを備える。図３に示すように、ホルダ３６はヘッド２５内に配置される案内部材３７によって上下にスライド可能とされている。以上の構成により、針棒２６は針棒軸３０の回転にともない上下動する。   A needle bar 26 is arranged on the head 25 so as to be movable up and down and back and forth. The needle bar 26 extends vertically and holds the needle 28 at the lower end protruding from the lower surface of the head 25. The needle bar drive mechanism 27 is a vertical movement mechanism 31 that converts the rotational movement of the needle bar shaft 30 into a vertical reciprocating drive of the needle bar 26, and a back-and-forth movement that converts the rotational movement of the upper shaft 29 into a longitudinal reciprocating drive of the needle bar 26. And a mechanism 32. The vertical movement mechanism 31 includes a motion crank 34 that is fixed to one end of the needle bar shaft 30, a link 35 that is connected to the motion crank 34 by an eccentric pin (not shown), and a needle bar 6 that is attached midway and connected to the link 35. The holder 36 is provided. As shown in FIG. 3, the holder 36 can be slid up and down by a guide member 37 disposed in the head 25. With the above configuration, the needle bar 26 moves up and down as the needle bar shaft 30 rotates.

次に、針棒駆動機構２７の前後動機構３２について説明する。ヘッド２５内における上軸２９の中途には上軸２９の軸心より偏心して形成される偏心部材４５が固定されている。偏心部材４５にはロッド４６の一端が連結されている。ロッド４６はその一端から下方に延び、その他端に第１クランク４７の一端が連結されている。第１クランク４７はその一端から後方に延びて配置されている。回動軸４８は、上軸２９より下方かつ後方、さらに針棒軸３０より上方かつ後方にて、左右に延びて水平配置され、ヘッド２５に回転可能に支持されている。第１クランク４７の他端は回動軸４８の中途に連結固定されている。回動軸４８の中途には、さらに、第２クランク４９の一端が固定されている。第２クランク４９はその一端から下方に延びて配置され、その他端にリンク５０の一端が連結されている。リンク５０はその一端から前方に延びて配置され、その他端は揺動腕５１の左側面に連結されている。揺動腕５１の右側面内側には案内部材３７が固定されている。揺動腕５１は針棒上受部５１ａと針棒下受部５１ｂとを有し、針棒上受部５１ａ，針棒下受部５１ｂに針棒２６が挿通されている。図３に示すように、針棒上受部５１ａは針棒２６とホルダ３６の連結部より上位置にて針棒２６を支持し、針棒下受部５１ｂは針棒２６とホルダ３６の連結部より下位置にて針棒２６を支持する。すなわち、針棒上受部５１ａと針棒下受部５１ｂによって、針棒２６は上下２位置で支持されている。また、揺動腕５１は左側面から左方へ延びる軸部５１ｃを有し、軸部５１ｃはヘッド２５に固定されているベアリング５５にて軸支されている。さらに、揺動腕５１は右側面に左右に貫通する軸穴５１ｄを有し、軸穴５１ｄには左右に延びて水平配置される軸５１ｅの左側一端が挿通され、軸５１ｅはネジ５１ｆにより揺動腕５１に固定されている。軸５１ｅの右側他端はヘッド２５に固定されているベアリング５６に軸支されている。すなわち、揺動腕５１はヘッド２５の左右で支持される両持ち構造にされている。なお、本実施例では、組立や加工上の都合により、揺動腕５１と軸５１ｅを別体としたが、軸５１ｅを軸部５１ｃ同様に揺動腕５１と一体としても良い。   Next, the longitudinal movement mechanism 32 of the needle bar drive mechanism 27 will be described. In the middle of the upper shaft 29 in the head 25, an eccentric member 45 formed eccentrically from the axis of the upper shaft 29 is fixed. One end of a rod 46 is connected to the eccentric member 45. The rod 46 extends downward from one end thereof, and one end of the first crank 47 is connected to the other end. The first crank 47 extends rearward from one end thereof. The rotation shaft 48 extends horizontally from the upper shaft 29 below and behind the needle shaft 30, and above and behind the needle bar shaft 30, and is rotatably supported by the head 25. The other end of the first crank 47 is connected and fixed in the middle of the rotating shaft 48. Further, one end of the second crank 49 is fixed in the middle of the rotation shaft 48. The second crank 49 extends downward from one end thereof, and one end of the link 50 is connected to the other end. The link 50 is disposed so as to extend forward from one end thereof, and the other end is connected to the left side surface of the swing arm 51. A guide member 37 is fixed inside the right side surface of the swing arm 51. The swing arm 51 has a needle bar upper receiving part 51a and a needle bar lower receiving part 51b, and the needle bar 26 is inserted into the needle bar upper receiving part 51a and the needle bar lower receiving part 51b. As shown in FIG. 3, the needle bar upper receiving portion 51 a supports the needle bar 26 at a position above the connecting portion between the needle bar 26 and the holder 36, and the needle bar lower receiving portion 51 b connects the needle bar 26 and the holder 36. The needle bar 26 is supported at a position below the section. That is, the needle bar 26 is supported at the upper and lower positions by the needle bar upper receiving part 51a and the needle bar lower receiving part 51b. The swing arm 51 has a shaft portion 51 c extending leftward from the left side surface, and the shaft portion 51 c is pivotally supported by a bearing 55 fixed to the head 25. Furthermore, the swing arm 51 has a shaft hole 51d penetrating left and right on the right side surface. The shaft hole 51d is inserted into the left end of a shaft 51e extending horizontally and horizontally, and the shaft 51e is swung by a screw 51f. It is fixed to the moving arm 51. The other right end of the shaft 51e is pivotally supported by a bearing 56 fixed to the head 25. That is, the swing arm 51 has a double-supported structure that is supported by the left and right sides of the head 25. In this embodiment, the swing arm 51 and the shaft 51e are separated from each other for convenience of assembly and processing. However, the shaft 51e may be integrated with the swing arm 51 like the shaft portion 51c.

以上の針棒駆動機構２７の前後動機構３２の構成により、針棒２６は上軸２９の回転にともない前後動する。まず、図示しないモータの駆動により上軸２９が回転するとロッド４６の上下動、第１クランク４７の揺動を通じて回動軸４８が軸中心に回動する。そして、第２クランク４９が回動軸４８を中心に揺動し、リンク５０の前後動を通じて揺動腕５１が軸部５１ｃおよび軸５１ｅを中心に揺動することになる。すなわち、針棒２６は揺動腕５１の揺動によって前後に揺動することになる。   With the above-described configuration of the longitudinal movement mechanism 32 of the needle bar drive mechanism 27, the needle bar 26 moves back and forth as the upper shaft 29 rotates. First, when the upper shaft 29 rotates by driving a motor (not shown), the rotating shaft 48 rotates about the shaft through the vertical movement of the rod 46 and the swing of the first crank 47. Then, the second crank 49 swings about the rotation shaft 48, and the swing arm 51 swings about the shaft portion 51c and the shaft 51e through the back and forth movement of the link 50. That is, the needle bar 26 swings back and forth due to the swing of the swing arm 51.

本発明のミシン２１の針棒駆動機構２７によれば、ヘッド２５内において上軸２９に対して下方に位置する針棒軸３０に上下動機構３１が連結され、上軸２９の回転運動を針棒軸３０にタイミングベルト４２を通じて伝達する構成としたので、上軸２９の上下位置かつタイミングベルト４２の長さに応じてアーム２４の上下位置を設定できる。例えば、従来ミシンと比較して、上軸２９をより上方に設定し、かつタイミングベルト４２を長尺にすることで、アーム２４を従来ミシンのアームの上下位置よりも上位置に設定できる。したがって、本発明のミシンの針棒駆動機構２７によれば、針棒２６の長さを長尺化することなく、ベッド上面からアーム２４下面までの懐高さを十分に確保できる。つまり、針棒の長さを長尺化することがないので、針棒の長尺化による問題は発生しない。また、ベッド上面からアーム２４下面までの懐高さを十分に確保できるので、上下に長尺の立体形状からなる被縫製物を縫製する場合であっても、縫製の作業性が損なわれることはない。
さらに、針棒２６の前後動機構３２における揺動腕５１を従来ミシンの片持ち構造からヘッド２５の左右で支持する両持ち構造としたので、針棒駆動機構２７は安定性を増す。
なお、本発明は以上説明した実施例に限定されるものではなく、当業者であれば、本発明の趣旨を逸脱しない範囲で、前記実施例に種々の変更を付加して実施することができ、本発明はそれらの変更形態をも包含するものである。 According to the needle bar drive mechanism 27 of the sewing machine 21 of the present invention, the vertical movement mechanism 31 is connected to the needle bar shaft 30 positioned below the upper shaft 29 in the head 25, and the rotational movement of the upper shaft 29 is controlled by the needle. Since the transmission is made to the rod shaft 30 through the timing belt 42, the vertical position of the upper shaft 29 and the vertical position of the arm 24 can be set according to the length of the timing belt 42. For example, the arm 24 can be set to a position higher than the vertical position of the arm of the conventional sewing machine by setting the upper shaft 29 further upward and making the timing belt 42 longer than the conventional sewing machine. Therefore, according to the needle bar drive mechanism 27 of the sewing machine of the present invention, the height from the bed upper surface to the arm 24 lower surface can be sufficiently secured without increasing the length of the needle bar 26. That is, since the length of the needle bar is not increased, there is no problem due to the increase in the length of the needle bar. In addition, since the pocket height from the upper surface of the bed to the lower surface of the arm 24 can be sufficiently secured, the sewing workability is impaired even when sewing a sewing object having a long three-dimensional shape up and down. Absent.
Further, since the swing arm 51 in the longitudinal movement mechanism 32 of the needle bar 26 is changed from the conventional cantilever structure of the sewing machine to the both-side support structure of the head 25, the needle bar drive mechanism 27 increases stability.
The present invention is not limited to the above-described embodiments, and those skilled in the art can implement various modifications to the above embodiments without departing from the spirit of the present invention. The present invention includes those modifications.

２１ ミシン
２６ 針棒
３０ 針棒軸
４２ タイミングベルト
４８ 回動軸
５１ 揺動腕 21 Sewing machine 26 Needle bar 30 Needle bar shaft 42 Timing belt 48 Rotating shaft 51 Swing arm

Claims (3)

上方に延びる脚柱部と、
前記脚柱部から水平方向に延びるアームと、
前記アームの先端に連設されるヘッドと、
前記ヘッドに設けられ下端に針を保持する針棒と、
前記ヘッド内に水平配置され回転可能に支持される上軸と、
前記ヘッド内に前記上軸より下方にて水平配置され回転可能に支持される針棒軸と、
前記上軸の回転運動を前記針棒軸に伝達する伝達機構と、
前記針棒軸の回転運動を前記針棒の上下往復駆動に変換する上下動機構と、
前記上軸の回転運動を前記針棒の前後往復駆動に変換する前後動機構と、
を備えることを特徴とするミシンの針棒駆動機構。 A pedestal that extends upward;
An arm extending horizontally from the pedestal, and
A head connected to the tip of the arm;
A needle bar provided on the head and holding a needle at the lower end;
An upper shaft horizontally disposed in the head and rotatably supported;
A needle bar shaft horizontally disposed below the upper shaft in the head and rotatably supported;
A transmission mechanism for transmitting the rotational movement of the upper shaft to the needle bar shaft;
A vertical movement mechanism that converts the rotational movement of the needle bar shaft into the vertical reciprocating drive of the needle bar;
A back-and-forth movement mechanism that converts the rotational movement of the upper shaft into a back-and-forth reciprocating drive of the needle bar;
A needle bar drive mechanism for a sewing machine comprising: 前記伝達機構は、前記上軸と前記針棒軸にそれぞれ設けられた歯付きプーリーと、これら歯付きプーリーに掛け渡されたタイミングベルトとから構成されていることを特徴とする請求項１に記載のミシンの針棒駆動機構。   The said transmission mechanism is comprised from the toothed pulley each provided in the said upper axis | shaft and the said needle bar axis | shaft, and the timing belt hung over these toothed pulleys, It is characterized by the above-mentioned. Needle bar drive mechanism of sewing machine. 前記前後動機構は、
前記上軸に設けられる偏心部と、
一端が前記偏心部に連結されるロッドと、
前記ロッドの他端に連結される第１クランクと、
前記上軸より下方にて水平配置されるとともに回転可能に支持され前記第１クランクが連結する回動軸と、
前記回動軸に連結される第２クランクと、
前記第２クランクに連結されるリンクと、
前記リンクに連結され上下２位置で前記針棒を支持する揺動腕とを備え、
前記揺動腕は左右に軸部をそれぞれ設け、前記両軸部は回転可能に前記ヘッドに支持されていることを特徴とする請求項１または請求項２に記載のミシンの針棒駆動機構。 The back and forth mechanism is
An eccentric portion provided on the upper shaft;
A rod having one end connected to the eccentric part;
A first crank connected to the other end of the rod;
A rotating shaft that is horizontally disposed below the upper shaft and is rotatably supported and connected to the first crank;
A second crank coupled to the pivot shaft;
A link connected to the second crank;
A swinging arm connected to the link and supporting the needle bar in two vertical positions;
3. The needle bar drive mechanism for a sewing machine according to claim 1, wherein the swinging arm is provided with shaft portions on the left and right sides, and both shaft portions are rotatably supported by the head.
JP2018062678A 2018-03-28 2018-03-28 Needle bar drive mechanism for sewing machine Pending JP2019170707A (en)

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TW108103061A TW201942438A (en) 2018-03-28 2019-01-28 Needle rod driving mechanism of a sewing machine to fully ensure the height from the upper surface of the machine bed to the lower surface of the machine arm without lengthening the length of the needle rod
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