EP0377404B1 - Machine à coudre zig-zag - Google Patents

Machine à coudre zig-zag Download PDF

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Publication number
EP0377404B1
EP0377404B1 EP89810868A EP89810868A EP0377404B1 EP 0377404 B1 EP0377404 B1 EP 0377404B1 EP 89810868 A EP89810868 A EP 89810868A EP 89810868 A EP89810868 A EP 89810868A EP 0377404 B1 EP0377404 B1 EP 0377404B1
Authority
EP
European Patent Office
Prior art keywords
support
needle bar
lever
machine according
seat
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
Application number
EP89810868A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0377404A3 (en
EP0377404A2 (fr
Inventor
Antonio Jimenez
Michel Combepine
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.)
Mefina SA
Original Assignee
Mefina SA
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 Mefina SA filed Critical Mefina SA
Publication of EP0377404A2 publication Critical patent/EP0377404A2/fr
Publication of EP0377404A3 publication Critical patent/EP0377404A3/fr
Application granted granted Critical
Publication of EP0377404B1 publication Critical patent/EP0377404B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B3/00—Sewing apparatus or machines with mechanism for lateral movement of the needle or the work or both for making ornamental pattern seams, for sewing buttonholes, for reinforcing openings, or for fastening articles, e.g. buttons, by sewing
    • D05B3/02—Sewing apparatus or machines with mechanism for lateral movement of the needle or the work or both for making ornamental pattern seams, for sewing buttonholes, for reinforcing openings, or for fastening articles, e.g. buttons, by sewing with mechanisms for needle-bar movement

Definitions

  • this needle bar is slidably mounted in a cradle, articulated to the frame of the machine by an intermediate point of its length and whose upper end is subjected to the action of a control device itself. imposing back and forth movements of amplitude characteristic of that desired for the throwing movement of the needle.
  • Swiss patent 458,899 and Japanese Kokai 51-103,547 and 51-103,548 precisely describe structures of this kind.
  • the needle bar is also associated with a cradle subjected to a pendulum movement, but this is made integral with the frame of the machine by two omni-directional joints, the first of which is near the upper end of the cradle and the second, located at the bottom of the sewing head, is generally mounted on a support lever, itself articulated on the machine frame.
  • the sewing machine no longer comprises, strictly speaking, cradle, the needle bar being slidably mounted inside two bearings respectively associated with a first fixed support, for one, and with a second support, movable transversely to the longitudinal axis of the needle bar, for the 'Other, these bearings being made integral with the respective support by means of connecting members ensuring them, individually, mobility relative to their support in at least two orthogonal directions.
  • the connecting members in question are constituted by sorts of cardan joints fixed between the bearing and a portion of the machine housing, for the upper bearing, and, for the lower bearing, between this bearing and the end of a control rod in translation, extending inside the upper arm of the machine up to a drive mechanism located in the vertical upright of the frame.
  • the external face of the bearings has a spherical profile by which they are pivotally engaged in corresponding seats, of complementary shape, associated with a support lever articulated on the frame of the machine , for the upper bearing, and integral with the frame, for the lower bearing.
  • the throwing movement of the needle bar is obtained by alternating tilting of the upper lever.
  • the invention specifically proposes to eliminate all of the above drawbacks by implementing the invention, the essential characteristics of which are defined, in particular, by claims 1 to 18.
  • the sewing machine according to the invention is similar to the machines of the state of the art of the first and second types described, as regards the pendulum oscillation mode chosen for the needle bar, and to those of the third type, from the point of view of the mechanical structures used, the simplicity of which is found, mutatis mutandis, in the embodiments which will be described below.
  • the needle bar 1 is driven in its alternating vertical movement from a shaft 2, itself controlled at its right end by a motor not shown and whose left end carries a discoidal plate 3 on which projects an eccentric pin 4.
  • lever 5 (fig. 2) freely mounted in a rectangular notch 6 which has one end of a connecting rod 7.
  • the lever 5 is made integral with this connecting rod by its second end which is mounted pivoting on an axis 8, integral with the connecting rod, and extending at right angles to the axis 4 already mentioned.
  • This axis 10 is integral with a stud 11 fixed to the upper end of the needle bar 1.
  • the needle bar 1 is slidably mounted in two bearings 12 and 13 having a spherical external profile and engaged in seats of complementary shape provided in a fixed support 14, for the first bearing, and, for the second bearing, in a lever 15 mounted tilting, by one end, around an axis 16 carried by a second fixed support 14 *, and the upper face of the other end of which has curved teeth 17 whose radius of curvature is centered on the axis 16.
  • the bearings 12 and 13 are preferably made of synthetic material with a low coefficient of friction but having good wear resistance: it may, for example, be Teflon, Delrin (registered trademarks) or even metals sintered. Thanks to the high elastic deformation capacities that such materials exhibit, it is indeed possible to introduce the bearings 12 and 13 into their respective seats by driving out.
  • the supports 14 and 14 * are both integral with the carcass of a stepping motor 18 controlling the tilting of the lever 15 by means of a pinion 19 meshing with the toothed sector 17 of this lever (fig. 3).
  • the needle bar can, in fact, be moved from its extreme right position 1 '(fig. 2A) to its extreme left position 1' 'and vice versa by corresponding displacement of the bearing 13 from its position 13' to its position 13 '' and vice versa.
  • the assembly "motor, needle bar, bearings" is in the form of a one-piece aggregate, of particularly reduced and removable volume.
  • This aggregate can therefore be manufactured anywhere, independently of the other constituent elements of the sewing machine, and be assembled on the job with a minimum of adjustments.
  • the stepping motor which comprises, mounted between two end flanges, an upper flange 20 and a lower flange 21, ball bearings 22 and 23 supporting a vertical shaft 24 to which is fixed, on the one hand, the armature 25 of the motor, and, on the other hand, a pinion 26.
  • the armature 25 Surrounding the armature 25, we recognize the stack 27a of the sheets of the inductor and a excitation winding 27b.
  • the upper flange 20 extends to the right, in the drawing (fig. 4), and has an opening 20a of spherical profile forming one of the two seats between which is enclosed, by its external face, also spherical, a first bearing 28 held in position by a cover plate 29, fixed on the flange 20 and having an opening 29a, of spherical profile, located in line with the opening 20a of the flange, the wall delimiting the opening 29a constituting the seat of the bearing 28 in cooperation with the wall defining the opening 20a.
  • the aggregate illustrated has a second identical one, 30, arranged coaxially with the previous one, and held in position by two shells 31a and 31b forming, by assembly, a lever 31 (Fig. 5) and which are clamped between the flange 21 of the motor and a complementary flange 32, bearing on a flange 21a of this flange visible only partially in FIG. 4 but also extending along the longitudinal edges thereof from this collar to its right end in the drawing.
  • the flange 32 is fixed to the flange 21a by screws, not shown, passing through the passage 32a; it has, in addition, an oblong window 32b, of arcuate profile located opposite a similar window, 21b, of the flange 21. These two windows are arranged one above the other and in line with the longitudinal axis of the opening of the bearings 28 and 30. These are in fact crossed by the needle bar 33 of the sewing machine whose stepping motor described must be able to control throwing movements.
  • the shells 31a and 31b forming the lever 31 are hollowed out, at the right end of their opposite faces, by a semi-spherical housing, 31c and 31d, located one to the right of the other and to the right corresponding housings 21c and 32c respectively, arranged on the facing faces of the flanges 21 and 32.
  • the aggregate described has two balls 34 and 35 forming a pivoting member for the lever 31.
  • the flanges 21 and 32 are further hollowed out, on their opposite faces, by a groove 21d, respectively 32d, of cross section having the profile of a circular segment centered on a point of each flange coinciding with the axis of symmetry of the housings 21c and 32c already described.
  • the external face of each of them is hollowed out by two recesses 31e, respectively 31f, of spherical shape and opening in line with the grooves 21d and 32d of the flanges 21 and 32.
  • These recesses form a seat for two pairs of balls 36 and 37 engaged, moreover, in the above grooves forming rolling and guide tracks for the lever 31, during its tilting around the pivot axis formed by the balls 34 and 35.
  • This lever 31 is in fact provided, at its left end (FIG. 5), with a toothed circular segment 38 with which the pinion 26 already cited engages.
  • any angular displacement of this pinion due to its drive by the stepping motor, results in a corresponding tilting of the lever 31 around its pivot axis (balls 34 and 35) and, consequently, of the bar needle 33 (throwing movement) inside the slots 21b and 32b.
  • the lever 31 has been replaced by a slide 39 capable of being moved in opposite directions, F1 and F2, by rolling on balls 40, associated with this slide, at the bottom of rectilinear grooves 41 formed in the flanges 21 and 32, all in the image of what has been described with reference to the execution of Figures 4 and 5.
  • An oblong slot 32d, formed in the flange 32, allows the needle bar d '' make its jetty movement.
  • This variant is more particularly intended for a sewing machine whose loop sensor rotates around a horizontal axis.
  • the sewing machine comprises an aggregate forming a body with a hollow rod 42 forming a support for a presser foot 43 (fig. 7).
  • This rod 42 is slidably mounted inside a tubular shaft 44, constituting the shaft of a stepping motor of which 45 is the armature, 46 the inductor, 47 and 48 of the end plates in a housing from which two ball bearings, 49 and 50 are driven, engaged, by their internal cage, with the shaft 44.
  • a spring device makes it possible to move the rod 42 vertically in order to drive it either in the illustrated position, in which the foot 43 is applied elastically against the working surface 51 of the lower arm 52 of the machine, or in a high position in which the foot 43 is distant.
  • the upper flange, 47, of the motor extends to the right, in the drawing, beyond the inductor 46, and forms a seat, in cooperation with an attached plate 53, for a bearing 54 with a spherical external profile.
  • This bearing is intended to ensure, in cooperation with a second bearing of the same type, 55, the maintenance and the axial guidance of a needle bar 56 which is driven in an alternating vertical movement by a mechanism not shown in the figure but of the genre illustrated in Figures 1 and 2, for example.
  • the bearing 55 is mounted between two shells 57a and 57b constituting a lever 57, integral, by its left part, (fig. 7) with the shaft 44 of the stepping motor of the aggregate and whose right part has , for each shell, on the one hand, a passage 57c, respectively 57d, the edges of which have a spherical profile complementary to the external profile of the bearing 55, and thus forming the seat of this bearing, and, on the other hand, a housing semi-spherical 57e and 57f, respectively.
  • the composite lever 57 is disposed between the flange 48 and a complementary flange 58, bearing on a flange 48a of the flange 48, a flange which is only partially visible in FIG. 7 but which also extends along the edges longitudinal of the flange 48, to the right end thereof, in the drawing.
  • the flange 58 is fixed to the flange 48a by screws (not shown) passing through passages 58a; it has, moreover, a window 58b, of arcuate profile, centered on the axis of the shaft 44 of the motor, window located opposite a similar window 48b of the flange 48. These two windows are superimposed and their length corresponds at the maximum amplitude of the desired throwing movement for the needle bar 56 which passes through them.
  • the flanges 48 and 58 finally comprise, on their opposite faces and at a distance from the axis of the shaft 44 corresponding to that separating this axis from the semi-spherical housings 57e and 57f of the shells 57a and 57b of the lever 57, a oblong groove of semi-circular section, 48c, respectively 58c, and of arcuate profile, centered on the axis of the shaft 44.
  • Balls 59 and 60 are arranged in the spaces delimited between the housings 57e and 57f and the respective grooves 48c and 58c.
  • the aggregate which has just been described is more particularly intended for a sewing machine whose loop sensor is mounted on a vertical axis disposed at the rear of the needle bar, or to the left of the latter in the drawing.
  • any angular displacement of the armature 45 of the stepping motor will result in a displacement of the same direction and amplitude of the composite lever 57 and, consequently, of the bearing 55 so that the needle bar 56 will tilt, relative to its pivot point constituted by the bearing 54, by an angle characteristic of the angular displacement of the armature.
  • any variation in the amplitude and direction thereof will correspond to a proportional change in the angle of the needle bar.
  • Such a variation can be obtained, in a well known manner, by supplying the stepping motor with periodic signals of various polarity and number, depending on the direction and amplitude desired for the pendulum movement of the needle bar.
  • the aggregate that comprises the sewing machine according to the invention has a simplified and particularly functional general architecture.
  • the stepping motor comprising a shaft 61 mounted on two ball bearings 62 and 63, between two flanges 64 and 65, and carrying the armature 66 of the motor as well as, at its lower end, a pinion 67.
  • the inductor 68 is represented, on the left of the shaft 66, by its stack of stator sheets and, on the right, by one of its windings.
  • the flange 64 extends to the right, beyond the inductor 68 to form a tab 64a having an opening 64b of frustoconical profile, going by tightening towards the top of the figure and which forms a seat for the external face, spherical, of a bearing 69 held in this opening by a vertical spring 70 engaged, by the upper end, on a neck 69a projecting from the lower part of the bearing 69 and, by its lower end, on a neck 71a which has the upper part of a second bearing 71, identical to the bearing 69 and resting on a seat formed by an opening 72a, of frustoconical profile, formed in a horizontal lever 72.
  • This profile becomes narrower towards the bottom of the figure.
  • the lever 72 is in the general form of a sector of a circle, toothed at 72b, in engagement with the pinion 67 and resting, on the upper face of a complementary flange 74, on the one hand, by two semi-protrusions 72c and 72d, and, on the other hand, by a ball 73, engaged both in a semi-spherical housing 72e of the lever and in a semi-spherical housing 74a of the flange 74.
  • a slot 72f, extending near the toothing 72b guarantees an elastic contact without play and damping, between the pinion 67 and the toothing itself.
  • the flange 74 is fixed to a flange 65e of the flange 65, of which only a portion is visible in the drawing but which also extends along the longitudinal edges of the latter, up to its straight end. This fixing is carried out by means of screws, not shown, passing through passages 74b and engaging in corresponding threaded holes made in the flange.
  • a window 74c of arcuate shape, allows the vertical passage and the lateral movement of a needle bar 75 slidably mounted in the bearings 69, 71.
  • the ball 73 constitutes a pivot axis for the lever 72 which can therefore be tilted clockwise and counterclockwise by corresponding angular displacement of the armature 66 of the stepping motor, each time in one direction contrary to that of tilting of the lever 72.
  • it will therefore be possible to drive the needle bar in a pendulum movement around the upper pivot point that constitutes the bearing 69 and thus obtain the throwing of the needle 76 carried by the needle bar 75.
  • the pendulum movement in question will be of amplitude programmed by sending to the stepping motor voltage pulses in number and polarity depending on the type of stitches to be sewn.
  • this lever is ensured to be permanently maintained in the correct position on the flange 74, by support of the projections. 72c on this flange, on the one hand, and by engagement of the ball 73 both in the housing 74a of the flange and in the housing 72e of the lever 72, on the other hand, without involving other holding members.
  • the aggregate described consists of a reduced number of parts, easy to assemble: it will suffice, in fact, to start by mounting the additional flange 74 on the flange 65e of the flange 65 of the stepper motor, then place the lever 72 on the flange 74 by engaging it, by its teeth 72b, with the pinion 67 secured to the motor shaft while inserting the ball 73 in the delimited space by the housing 72e of the lever and the housing 74a of the flange 74.
  • two bearings are mounted separately, such as those indicated by the references 69 and 71, at the two ends of a spring, such as the spring 70, by engaging the neck 69a, respectively 71a, of the bearings in the first end opening. of the spring, respectively in the second end opening.
  • a spring such as the spring 70
  • the spring 70 is allowed to relax so that the bearings will engage in the above seats.
  • the needle bar 75 is introduced into the opening of the first bearing (69 or 71), then through the spring 70 and, finally, into the opening of the second bearing, by axial sliding of the bar in the bearings.
  • the spring 70 of the embodiment of Figure 9 could very well be replaced by an elastic member of another nature. He could, in particular, be a prestressed elastic blade, having for example the shape of a V, in support, by the end of its brassur, the weights 69 and 71 respectively.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
EP89810868A 1988-11-30 1989-11-13 Machine à coudre zig-zag Expired - Lifetime EP0377404B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH4439/88A CH676999A5 (no) 1988-11-30 1988-11-30
CH4439/88 1988-11-30

Publications (3)

Publication Number Publication Date
EP0377404A2 EP0377404A2 (fr) 1990-07-11
EP0377404A3 EP0377404A3 (en) 1990-08-29
EP0377404B1 true EP0377404B1 (fr) 1993-05-26

Family

ID=4276150

Family Applications (2)

Application Number Title Priority Date Filing Date
EP89810867A Expired - Lifetime EP0377403B1 (fr) 1988-11-30 1989-11-13 Machine à coudre zig-zag
EP89810868A Expired - Lifetime EP0377404B1 (fr) 1988-11-30 1989-11-13 Machine à coudre zig-zag

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP89810867A Expired - Lifetime EP0377403B1 (fr) 1988-11-30 1989-11-13 Machine à coudre zig-zag

Country Status (15)

Country Link
US (2) US5063865A (no)
EP (2) EP0377403B1 (no)
JP (2) JPH02182285A (no)
KR (2) KR900008093A (no)
CN (2) CN1025538C (no)
AU (2) AU621422B2 (no)
BR (2) BR8906042A (no)
CA (2) CA2003959A1 (no)
CH (1) CH676999A5 (no)
DD (2) DD289302A5 (no)
DE (2) DE68906774T2 (no)
ES (2) ES2044212T3 (no)
PT (2) PT92430B (no)
RU (1) RU2050425C1 (no)
ZA (2) ZA899035B (no)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH684418A5 (fr) * 1990-11-29 1994-09-15 Mefina Sa Machine à coudre.
US5365298A (en) * 1993-04-05 1994-11-15 Eastman Kodak Company Camera shutter with oscillation damping
JP2001340675A (ja) * 2000-05-31 2001-12-11 Aisin Seiki Co Ltd オーバーロックミシン
KR20010007724A (ko) * 2000-07-04 2001-02-05 임준기 마취효과와 살균력을 가진 밴드
JP2003117271A (ja) * 2001-10-17 2003-04-22 Yamato Sewing Mach Co Ltd ミシン
RU2215838C1 (ru) * 2002-06-11 2003-11-10 Общество с ограниченной ответственностью "Завод бытовых швейных машин" Швейная машина зигзаг
RU2215840C1 (ru) * 2002-07-17 2003-11-10 Общество с ограниченной ответственностью "Завод бытовых швейных машин" Блок-модуль фронтальных механизмов швейной машины
JP4913373B2 (ja) * 2005-01-07 2012-04-11 Ｊｕｋｉ株式会社 ミシンの針駆動機構
JP2009061031A (ja) * 2007-09-05 2009-03-26 Juki Corp ボタン穴かがりミシン
JP2010094272A (ja) * 2008-10-16 2010-04-30 Juki Corp サージングミシン
CN101942745B (zh) * 2010-07-27 2013-04-24 际华三五三四制衣有限公司 一种由平缝机改装的临缝机
CN203051709U (zh) * 2012-11-09 2013-07-10 台州拓卡奔马机电科技有限公司 一种套结机上的下轴齿密封机构
US9657418B2 (en) * 2013-03-14 2017-05-23 Windham Sewing Machines, Llc Sewing machine
CN105970491B (zh) * 2016-05-19 2018-12-18 台山山度士制衣厂有限公司 旋轴式高厚材料缝纫装置
CN111364181B (zh) * 2020-04-10 2023-08-29 诸暨轻工时代机器人科技有限公司 毛巾线圈的挑动机构和单电机梭式毛巾装置

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DE596356C (de) * 1933-02-28 1934-05-04 Carl J Lehmann Fa Naehmaschine, insbesondere zum Einnaehen von Hutleder in Schirmmuetzen
US2253110A (en) * 1937-11-19 1941-08-19 Jr Edward S Cornell Self-compensating bearing
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MC1176A1 (fr) * 1977-02-02 1978-09-25 T Arvai Perfectionnements au montage de l'aiguille dans une machine a coudre
US4215638A (en) * 1978-06-12 1980-08-05 The Singer Company Needle bar suspension means for a zig-zag sewing machine
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Also Published As

Publication number Publication date
CH676999A5 (no) 1991-03-28
CN1025537C (zh) 1994-07-27
EP0377404A3 (en) 1990-08-29
KR910009993A (ko) 1991-06-28
JPH02182285A (ja) 1990-07-16
CN1043172A (zh) 1990-06-20
DD289302A5 (de) 1991-04-25
CN1025538C (zh) 1994-07-27
AU4570389A (en) 1990-06-07
US5063865A (en) 1991-11-12
ZA899035B (en) 1990-09-26
DE68907884T2 (de) 1994-03-10
EP0377403A2 (fr) 1990-07-11
DD289301A5 (de) 1991-04-25
DE68906774D1 (de) 1993-07-01
RU2050425C1 (ru) 1995-12-20
CN1043169A (zh) 1990-06-20
AU621421B2 (en) 1992-03-12
KR900008093A (ko) 1990-06-02
US5099776A (en) 1992-03-31
PT92430A (pt) 1990-05-31
EP0377404A2 (fr) 1990-07-11
BR8906042A (pt) 1990-06-19
ES2043096T3 (es) 1993-12-16
DE68906774T2 (de) 1994-01-05
PT92429B (pt) 1995-08-09
BR8906043A (pt) 1990-06-19
AU4570289A (en) 1990-06-07
PT92429A (pt) 1990-05-31
CA2003958A1 (fr) 1990-05-31
ZA899171B (en) 1990-09-26
JPH02182284A (ja) 1990-07-16
CA2003959A1 (fr) 1990-05-31
AU621422B2 (en) 1992-03-12
EP0377403A3 (en) 1990-08-22
PT92430B (pt) 1995-09-12
ES2044212T3 (es) 1994-01-01
DE68907884D1 (de) 1993-09-02
EP0377403B1 (fr) 1993-07-28

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