EP3101166B1 - Workpiece-moving device and sewing machine using same - Google Patents

Workpiece-moving device and sewing machine using same Download PDF

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Publication number
EP3101166B1
EP3101166B1 EP14879610.5A EP14879610A EP3101166B1 EP 3101166 B1 EP3101166 B1 EP 3101166B1 EP 14879610 A EP14879610 A EP 14879610A EP 3101166 B1 EP3101166 B1 EP 3101166B1
Authority
EP
European Patent Office
Prior art keywords
workpiece
rail
loading table
frame
moving device
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.)
Active
Application number
EP14879610.5A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3101166A1 (en
EP3101166A4 (en
Inventor
Kazunori Furukawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of EP3101166A1 publication Critical patent/EP3101166A1/en
Publication of EP3101166A4 publication Critical patent/EP3101166A4/en
Application granted granted Critical
Publication of EP3101166B1 publication Critical patent/EP3101166B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B39/00—Workpiece carriers
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B21/00—Sewing machines with devices for automatically controlling movement of work-carrier relative to stitch-forming mechanism in order to obtain particular configuration of seam, e.g. programme-controlled for sewing collars, for attaching pockets

Definitions

  • the present invention relates to a sewing machine including a conveyance device and a workpiece-moving device and the present invention especially relates to a sewing machine provided with a structure which translates a workpiece to an arbitrary position on a plane and rotates the workpiece.
  • a pattern sewing machine is now being widely used in which a conveyance device moves a sewn material with respect to a sewing needle so as to be able to sew automatically a sewing pattern whose sewing direction varies; and there exist many kinds of sewing machines which vary, according to usages, in extent to be able to sew or in means to form a seam.
  • a ⁇ PS region for perfect stitch In a workpiece conveyance method used by a conventional conveyance device, there formed are a ⁇ PS region for perfect stitch and a ⁇ HS region for hitch stitch, as shown in Fig. 11 .
  • Fig. 12 (A) in the ⁇ PS region, fastening is performed in a balanced and symmetrical state, to produce uniform and high quality stitches.
  • Fig. 12 (B) in the ⁇ HS region, unbalanced stitches are produced, remarkably damaging the appearance of patterns. Thus a problem of deterioration in quality arises.
  • Patent Document 1 a conventional technique has been proposed in which the workpiece is rotated and a relative sewing direction seen from the workpiece is varied so that a sewing direction seen from a sewing needle is kept constant (for example, Patent Document 1).
  • Patent Documents 2, 3 and 4 also discusses relevant prior art.
  • a rotation motor of a rotation device to rotate the workpiece is provided so as to be integrated with a conveyance device; therefore, when the conveyance device is shifted, it is also necessary to translate the rotation motor.
  • the rotation motor's weight is born by a drive unit of the conveyance device, giving heavier load thereto. This makes it impossible to quickly shift, lowering the conveyance capability.
  • the present invention is made to solve the problem.
  • the purpose of the present invention is that the conveyance device and the workpiece-moving device are individually operated to efficiently perform sewing involving rotation, thereby significantly reducing both of drive units' loads.
  • a workpiece-moving device that translates and rotates a workpiece during operation of a sewing machine, includes: a frame to be translated by a conveyance motor; a loading table on which the workpiece is put, the loading table being disposed rotatably to the frame and translated together with the frame; a drive unit that is installed so as to keep unchanged the drive unit's relative position to the sewing machine even when the frame and the loading table are translated by the conveyance motor's driving; and a transmission means that includes: a first rail that is connected to at least one portion of the loading table; a second rail that is arranged skew to the first rail; a linking component that slidably links the first rail to the second rail; a first pulley; and a holding component that links the second rail to the first pulley, to transmit driving force of the drive unit to the loading table to rotate the loading table.
  • another workpiece-moving device that translates and rotates a workpiece during operation of a sewing machine, includes: a frame to be translated by a conveyance motor; a loading table on which the workpiece is put, the loading table being disposed rotatably to the frame and translated together with the frame; a drive unit that is installed so as to keep unchanged the drive unit's relative position to the sewing machine even when the frame and the loading table are translated by the conveyance motor's driving; and a transmission means that includes: a first rail that is connected to at least one portion of the loading table; a second rail that is arranged skew to the first rail; a linking component that slidably links the first rail to the second rail; a first gear; and a holding component that links the second rail to the first gear, to transmit driving force of the drive unit to the loading table to rotate the loading table.
  • Another workpiece-moving device not forming part of the present invention is a workpiece-moving that translates and rotates a workpiece during operation of a sewing machine, and includes: a frame to be translated by a conveyance motor; a loading table on which the workpiece is put, the loading table being disposed rotatably to the frame and translated together with the frame; and a regulation means that includes a first rail that is connected to at least one portion of the loading table; a second rail that is arranged skew to the first rail; a linking component that slidably links both of the first rail and the second rail; a holding component that is placed on the second rail; and a brake device to regulate rotation of the holding component, to regulate part of movement of the loading table translated with the frame, into movement in a direction different from a direction in which the whole loading table is translated.
  • a workpiece of a sewing machine can be rotated when conveyed, and the weight of a motor for rotating the workpiece can cause less influence in conveying and controlling.
  • Fig. 1 is a perspective view showing a state of a sewing machine to which a workpiece-moving device of the present invention is installed.
  • the sewing machine M1 includes an upper structure and a lower structure; the upper structure is a sewing machine arm M1a for sewing a workpiece, and the lower structure is a sewing machine bed M1b for fixing the workpiece.
  • the workpiece-moving device 10 is a device for translating and rotating the workpiece during the sewing machine's operation.
  • the workpiece-moving device 10 is installed between the sewing machine arm M1a and the sewing machine bed M1b.
  • Fig. 2 is a perspective view showing a state of the sewing machine M1 to which the workpiece-moving device 10 is not installed.
  • the sewing machine M1 shown in the figure does not rotate the workpiece, and only carries the workpiece in x and y directions; in the sewing machine, a conveyance device 102 having a conveyance motor carries a clamp device 101 holding the workpiece in x direction and y direction of coordinates shown in the figure, to move the workpiece relative to a sewing needle 103, thereby enabling to automatically sew an intended pattern.
  • the sewing machine arm M1a includes a sewing needle 103, a needle bar 104 which holds the sewing needle 103 and raises and lowers the sewing needle in z direction, a presser device 105 which prevents cloth from being lifted when a thread is pulled up during sewing, and a needle thread take-up lever 106 which pulls up a needle thread passing through the sewing needle 103.
  • the sewing machine bed M1b includes the clamp device 101 which holds the workpiece, the conveyance device 102 which carries the workpiece to any position in x direction and/or y direction, a slide plate 107 being a plane on which the workpiece is processed, and a hook 108 which entangles a needle thread passing through the sewing needle 103 with a bobbin thread.
  • the clamp device 101 in Fig. 2 can be replaced with the workpiece-moving device 10 in Fig. 1 .
  • Fig. 3 is a perspective view showing a detailed structure of the workpiece-moving device 10 of Embodiment 1 of the present invention.
  • the workpiece-moving device 10 includes a frame 31 which is translated by the conveyance motor of the conveyance device 102 provided in the sewing machine M1, and a loading table 32 which is disposed to be rotatable with respect to the frame 31 and is translated with the frame 31, and on which the workpiece is placed.
  • the workpiece-moving device further includes a drive unit 40 which is a separate component installed thereto so that the relative position to the sewing machine is kept unchanged even when the frame 31 and the loading table 32 are translated by driving of the conveyance motor of the conveyance device 102.
  • the workpiece-moving device includes a transmission means 20A which transmits driving force of the drive unit 40 to the loading table 32 to rotate the loading table 32.
  • the transmission means 20A includes a first rail 22a which is connected to at least one part of the loading table 32, a second rail 22b which is arranged perpendicular or skew to the first rail 22a, and a linking component 22c which slidably links the second rail 22b to the first rail 22a.
  • the transmission means further includes a first pulley 24, and an arm-shaped plate (holding component) 21 which links the second rail 22b to the first pulley 24.
  • At least one of the linking component 22c and the arm-shaped plate 21 is slidably linked to the second rail 22b, and the transmission mean is provided with a belt that is wrapped around the first pulley 24 to rotate the first pulley 24.
  • the first pulley 24 is fixed onto the arm-shaped plate 21.
  • the first rail 22a is fixed to the loading table 32, or may be formed so as to be integrated with the loading table 32.
  • the drive unit 40 of the workpiece-moving device 10 includes a drive motor 41 and a second pulley 42 which is linked or directly connected to a rotation shaft of the drive motor 41 and around which the belt is wrapped to transmit driving force.
  • the second pulley 42 is linked to the first pulley 24 through the belt 25 of the transmission means 20A, to transmit power of the drive motor 41 to the first pulley 24.
  • the drive motor 41 is a stepping motor.
  • a motor cable used for the drive unit 40 passes from a side face of the sewing machine arm M1a through the sewing machine bed M1b, to be finally connected to a control panel not shown in the figure.
  • the drive motor of the drive unit 40 drives an arm-shaped plate 21, and the arm-shaped plate 21 transmits driving force to the loading table 32 through the first rail 22a, the second rail 22b, and the linking component 22c, to rotate the loading table 32.
  • the drive unit 40 is placed in separation from the frame 31 and the loading table 32; therefore, when the conveyance motor of the conveyance device 102 translates the workpiece, the weight of the drive unit 40 is not borne by the conveyance motor, which thereby enables a high speed conveyance with high accuracy.
  • a support frame 20a drawn with alternate long and two dashes lines in the figure is screwed to a mounting plate (not shown in the figure) for installation of an additional device, which is previously provided to the sewing machine arm M1a; then the transmission means 20A and the drive unit 40 are fixed to the mounting plate for installation of an additional device.
  • the mounting plate is provided to a face opposed to the sewing machine bed M1b of the sewing machine arm M1a; or the mounting plate may be integrated with the sewing machine arm M1a.
  • the above-described transmission means 20A and the drive unit 40 may be installed at any positons on the sewing machine if such installment positions cause no problem to operate.
  • the support frame 20a can be transformed according to the installment positions, or sometimes may not be installed.
  • Fig. 4 is a perspective view showing the transmission means 20A and the drive unit 40 of Embodiment 1.
  • the first pulley 24 is fixed to the arm-shaped plate 21 by means of screws or the like, and second rails 22b (not shown in the figure) provided to the arm-shaped plate 21 are slidably held facing each other across the rotation center of the first pulley 24.
  • the second rails 22b which include blocks 22d having bearings are linked to the arm-shaped plate 21.
  • the transmission means 20A of the workpiece-moving device 10 includes the mounting plate 23.
  • the mounting plate 23 is a plate for fixing the first pulley 24, the drive unit 40, and the support frame 20a, and enables the transmission means 20A and the drive unit 40 to be integrally installed to the sewing machine arm M1a.
  • a sensor for detecting an origin position and a detection plate being an object to be detected It is also possible to install, on the transmission means 20A, a sensor for detecting an origin position and a detection plate being an object to be detected.
  • Fig. 5 is a cross-sectional view of the workpiece-moving device 10, taken along B-B line in Fig.3 .
  • the first pulley 24 is held by a cylinder shaft 44 through a bearing 43.
  • the cylinder shaft 44 is provided with the needle bar 104, the presser device 105, and space for a thread not shown in the figure to move without interference.
  • the transmission means 20A is connected to the loading table 32 through the first rails 22a, the second rails 22b and the linking components 22c to transmit driving force of the drive unit 40 to the loading table 32 and rotate it.
  • each first rail 22a and each second rail 22b are orthogonally arranged with each other in Embodiment 1, no problem arises even when an oblique intersection arrangement is employed.
  • the two parallel first rails 22a are used, the number of the rails is not limited to that number, and a single rail or three or more rails may be used.
  • Fig. 6 is an exploded perspective view showing the workpiece-moving device 10.
  • the guide rollers 31a each having a trench and a bearing are fixed to the guide roller holders 31b with pins 31c to be arranged in circumference.
  • the plural guide rollers 31a are arranged; when they are arranged, fine adjustments are made to the guide roller holders 31b to be able to keep the rotation center of the loading table 32 at a fixed position, preventing the loading table 32 from being shifted in z direction perpendicular to the process plane for the workpiece.
  • the loading table 32 includes a press down frame 34 for holding a placed workpiece (sewing material such as cloth or leather), and an opening S formed in the press down frame 34 according to a target pattern to be sewn; and the press down frame 34 and the opening S is provided to a base plate 32b of the loading table 32.
  • a press down frame 34 for holding a placed workpiece (sewing material such as cloth or leather), and an opening S formed in the press down frame 34 according to a target pattern to be sewn; and the press down frame 34 and the opening S is provided to a base plate 32b of the loading table 32.
  • the press down frame 34 can be opened and closed by means of a hinge 35a; on the back face of the press down frame 34, magnets 35b are arranged to hold the workpiece with magnetic force.
  • the workpiece holding method may include a holding means that utilizes a toggle clamp or repulsion of springs. If a workpiece-processing portion including the holding means is separated from the base plate 32b and is made attachable to and removable from the base plate 32b, this makes the sewing machine flexibly operate for variations in workpiece and sewing pattern.
  • Fig. 7 is a view for explaining a method to attach and remove a workpiece W on the loading table 32.
  • Figs. 8 are top face views schematically showing rotation of the workpiece-moving device 10 of Embodiment 1 according to the present invention.
  • a point C is the center of the sewing needle 103 and identical to the rotation center of the transmission means 20A;
  • a point O is the rotation center of the frame 31 connected to the conveyance device 102 not shown in the figures.
  • Fig. 8(A) shows a waiting state in which the point C coincides with the point O; from here, the point C is shifted to a point S, as shown in Fig. 8(B) ; then, the loading table 32 is rotated counterclockwise by 90 degrees around the point S, as shown in Fig. 8(C) .
  • the conveyance device 102 carries the frame 31 to a position where the point C being the center of the sewing needle 103 coincides with the point S on the loading table 32. Because the transmission means 20A and the loading table 32 are connected with the first rails 22a and second rails 22b that are arranged to intersect with each other, their relative positions can be arbitrarily set when the frame 31 is translated on x-y plane.
  • the point S on the loading table 32 into which the sewing needle 103 is stuck is made to be shifted with respect to the sewing needle 103. This causes needle breakage, needle bending, a processing hole enlarged by the needle, or overfeed of the thread, significantly lowering the sewing quality.
  • the conveyance device 102 translates the frame 31 so that the point O moves to a point O1 along a circular arc R, as shown in Fig. 8(C) .
  • the workpiece-moving device 10 of the present invention the workpiece can be rotated without any restriction at any position in x-y plane in a state in which the position of the center of the sewing needle 103 coincides with a point into which the sewing needle 103 is stuck.
  • the usage of the transmission means 20A for the workpiece-moving device 10 causes the drive unit 40 to drive and smoothly move the loading table 32 and enables a high accuracy conveyance. Therefore, it is possible to sew with another method described below.
  • Fig. 9 (A) to Fig. 9 (D) show a process to sew a circular arc pattern.
  • the center of a circular arc pattern S coincides with a rotation center O of the loading table 32.
  • perfect stitches can be sewn in a circular arc with a radius equivalent to the distance between the rotation center O of the loading table 32 and the center C of the sewing needle 103.
  • fewer stitches make the pattern look like a polygon. This sometimes causes a seam formation direction to point to the outside of the ⁇ PS region, to which attention should be paid.
  • Embodiment 1 there is a feature in that the drive unit 40 is provided to the sewing machine in separation from the conveyance device 102, which allows rotation around the sewing needle 103 and conveyance of the workpiece on the process plane to be individually performed during sewing operation; therefore, it suffices that the loading table 32 is driven through the transmission means 20A only by the drive unit 40, enabling an efficient sewing.
  • the workpiece-moving device 10 of the present invention is installed so that the rotation center of the arm-shaped plate 21 coincides with the center of the needle bar 104; however, because the first rails 22a and the second rails 22b slide, it is not necessary that the centers coincide with each other.
  • applicable shapes are not limited to that shown in the figure; by changing the configuration near attaching portion of the workpiece-moving device according to a sewing machine being an installation target, the workpiece-moving device 10 can be also installed to various kind of sewing machines including the conveyance device 102; it is also easy to restore the sewing machine to that before the workpiece-moving device 10 is installed.
  • the drive unit 40 is installed in separation from the frame and the loading table so as to keep unchanged the drive unit's relative position to the sewing machine even when the frame 31 and the loading table 32 are translated, which thereby causes them not to interfere with each other and eliminates necessities to consider loads due to individual device weights and to consider rotation or translation of wires, enabling an efficient conveyance. Furthermore, rotation around the sewing needle 103 and conveyance on the process plane can be arbitrarily changed, to perform high quality sewing.
  • Embodiment 2 not forming part of the present invention, using figures.
  • Components that are also used in Embodiment 1 are designated by the same numerals, and explanation thereof is omitted.
  • Fig. 10 is a perspective view showing a workpiece-moving device of Embodiment 2.
  • a workpiece-moving device 10 includes a frame 31 which is translated by a conveyance motor, a loading table 32 which is disposed rotatably to the frame 31 and translated together with the frame, and on which the workpiece is put, and a regulation means 20B which regulates part of movement of the loading table 32 being translated together with the frame 31 into movement in a direction different from a direction in which the whole loading table 32 is translated.
  • the regulation means 20B includes a first rail 22a which is connected to at least one part of the loading table 32, a second rail 22b which is arranged skew to the first rail 22a, a linking component 22c which slidably links both of the first rail 22a and the second rail 22b, an arm-shaped plate (holding component) 21 which is placed on the second rail 22b, a brake device 26 which regulates rotation of the arm-shaped plate 21, and a mounting plate 23 on which the brake device 26 is placed.
  • the first rail 22a is provided with a brake, to regulate sliding movement of the first rail 22a at any position.
  • the brake device 26 and the brake-provided first rail 22a include an air cylinder, a solenoid valve, or the like.
  • Embodiment 2 by connecting the frame 31 to the conveyance device 102 and carrying, using the conveyance motor, the conveyance device 102 to any position in x direction and/or y direction, the frame 31 is moved together with the conveyance device 102, and the loading table 32 is also moved.
  • the regulation means 20B regulates part of movement of the loading table 32; therefore, the loading table 32 itself is to be controlled so as to move in a direction different from a direction in which the frame 31 is moved; in other words, the loading table 32 itself is to be controlled to move in a direction in which the loading table 32 itself is rotated, as shown in Fig. 8(C) .
  • operation of the first rail 22a can be regulated at any position. This makes it possible to proceed to pattern sewing by releasing the regulation of the first rail 22a after completing rotation, and to rotate the workpiece without any restriction.
  • Embodiment 2 when performing rotation operation, the workpiece-moving device 10 is operated together so that the conveyance device 102 performs back or forward circular operation around the center of the sewing needle 103 by a desired rotation angle. This enables the workpiece to be rotated around the sewing needle 103 without exclusive rotation power.
  • the workpiece-moving device of the present invention can be applied to various kinds of sewing machines due to features that the workpiece-moving device can rotate a workpiece around the sewing needle without any restriction, the workpiece-moving device can be operated in separation from the conveyance device, and the workpiece-moving device can be installed without depending on the sewing machine.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
EP14879610.5A 2014-01-27 2014-01-27 Workpiece-moving device and sewing machine using same Active EP3101166B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2014/000380 WO2015111099A1 (ja) 2014-01-27 2014-01-27 縫製物移動装置及びそのミシン

Publications (3)

Publication Number Publication Date
EP3101166A1 EP3101166A1 (en) 2016-12-07
EP3101166A4 EP3101166A4 (en) 2017-11-29
EP3101166B1 true EP3101166B1 (en) 2018-12-19

Family

ID=52344802

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14879610.5A Active EP3101166B1 (en) 2014-01-27 2014-01-27 Workpiece-moving device and sewing machine using same

Country Status (5)

Country Link
EP (1) EP3101166B1 (pt-PT)
JP (1) JP5648771B1 (pt-PT)
CN (1) CN105980620B (pt-PT)
BR (1) BR112016016954B8 (pt-PT)
WO (1) WO2015111099A1 (pt-PT)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105088551B (zh) * 2015-08-28 2018-03-09 诸暨市樱之秀服饰有限公司 一种缝纫机旋转压脚

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Publication number Priority date Publication date Assignee Title
JPS59181185A (ja) * 1983-03-30 1984-10-15 蛇の目ミシン工業株式会社 刺しゆう枠駆動装置
US4601249A (en) * 1984-12-24 1986-07-22 Frye David E Cloth stitching apparatus and method
JP2899185B2 (ja) * 1991-10-16 1999-06-02 日本電波株式会社 回転付きジグザグ刺繍機
JPH06105979A (ja) * 1992-09-25 1994-04-19 Juki Corp ミシンのワーク搬送装置
JP2985164B2 (ja) * 1992-11-04 1999-11-29 ブラザー工業株式会社 ミシンの曲布張枠駆動装置
JP3771286B2 (ja) * 1993-12-22 2006-04-26 アイシン精機株式会社 ミシンの刺繍枠駆動装置及びその制御方法
JPH1033859A (ja) 1996-07-23 1998-02-10 Juki Corp ミシンおよびワーク搬送装置
JPH1170282A (ja) * 1998-07-14 1999-03-16 Brother Ind Ltd 刺繍装置付き電動ミシン
JP4605455B2 (ja) * 2005-03-25 2011-01-05 ブラザー工業株式会社 ミシンの布送り装置
CN101591838B (zh) * 2008-05-26 2013-03-27 Juki株式会社 电子循环缝纫机
DE102011120436A1 (de) * 2010-12-08 2012-06-14 Sunstar Co, Ltd Nähmaschine und Verfahren zum Steuern ihres Betriebs
CN102619031B (zh) * 2011-01-28 2013-09-11 欧利速精密工业股份有限公司 缝纫机的车缝方向定位装置
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Also Published As

Publication number Publication date
CN105980620B (zh) 2017-11-21
JP5648771B1 (ja) 2015-01-07
BR112016016954B8 (pt) 2023-01-31
JPWO2015111099A1 (ja) 2017-03-23
BR112016016954A2 (pt-PT) 2017-08-08
EP3101166A1 (en) 2016-12-07
WO2015111099A1 (ja) 2015-07-30
CN105980620A (zh) 2016-09-28
BR112016016954B1 (pt) 2021-12-21
EP3101166A4 (en) 2017-11-29

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