EP0488956B1 - Sewing machine - Google Patents
Sewing machine Download PDFInfo
- Publication number
- EP0488956B1 EP0488956B1 EP91810918A EP91810918A EP0488956B1 EP 0488956 B1 EP0488956 B1 EP 0488956B1 EP 91810918 A EP91810918 A EP 91810918A EP 91810918 A EP91810918 A EP 91810918A EP 0488956 B1 EP0488956 B1 EP 0488956B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- spindle
- slide
- sewing machine
- pivot
- feed
- 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 title claims description 10
- 230000007246 mechanism Effects 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 229920003023 plastic Polymers 0.000 claims description 5
- 239000004033 plastic Substances 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 4
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 2
- 239000004744 fabric Substances 0.000 description 6
- 238000005096 rolling process Methods 0.000 description 3
- 230000007723 transport mechanism Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B27/00—Work-feeding means
- D05B27/22—Work-feeding means with means for setting length of stitch
Definitions
- the present invention relates to a sewing machine comprising a drive mechanism for the sewing material associated with a device for adjusting the amplitude and the direction of the fabric feed, this mechanism comprising a drive shaft and a fabric transport member, two opposite ends of which are kinematically connected to this drive shaft by two link and lever transmissions, one of which defines a first movement trajectory in a direction substantially parallel to a fabric support plane, while the other defines a second displacement trajectory in a direction substantially perpendicular to this plane, said adjustment device comprising a slide in an arc of a circle centered on a trajectory described by an articulation between two connecting rods of said transport mechanism, this slide being pivotally mounted around an axis passing through the center of this trajectory, and means feelers integral with said axis, engaged with this slide.
- DE-Cl-3121266 has already proposed a device for adjusting the amplitude and / or the direction of advance of this type of fabric in which the slide guide and / or the slide are made of plastic and have pairs of divergent sliding surfaces.
- the plastic material chosen has a low coefficient of friction and can therefore be formed of PTFE with the addition of silicone or graphite powder to reduce the coefficient of friction. The fact remains that friction exists and that it is likely to cause wear sooner or later.
- the fact that the active surfaces of the slide guide and / or of the slide are made of plastic does not guarantee a long service life of the device.
- the object of the present invention is to remedy at least in part the above-mentioned drawbacks.
- the subject of the present invention is a sewing machine according to claim 1.
- FIG. 1 is a sectional view along line I-I of FIGS. 2 and 3.
- Figure 2 is a sectional view along line II-II of Figure 1.
- Figure 3 is a sectional view along line III-III of Figure 1.
- FIG. 4 is an enlarged sectional view along the line IV-IV of FIG. 2.
- This mechanism comprises (fig. 3) a drive shaft 3 secured to a connecting rod 4, one end of which is articulated around an eccentric 5 describing a circular path around the axis of this drive shaft 3.
- This shaft 3 carries also a cam 6 against which an arm of a lever 7 rests, the other arm of which is connected to one end of a fabric transport member 8 by a connecting rod 9.
- a return spring 2 tends to hold the lever 7 in contact with cam 6.
- This transport member 8 is articulated to an arm of a lever 10, the other arm of which is connected to the connecting rod 4 by a connecting rod 11.
- the axis 12 carries two rollers 13 and 14, one of which 13 is frustoconical, which engage in a slide 20 (fig. 2) formed in a mobile 15 provided with an axial bore of circular cylindrical section and pivotally mounted on a pivot 16 fixed to the frame B carrying the transport mechanism.
- This mobile 15, which is used to adjust the amplitude and the direction of drive of the conveyor 8a, carries a toothing 17 intended to come into engagement with a pinion 18 integral with the shaft of a stepping motor 19 and intended to orient the slide 20 around a central point of the trajectory of the axis 12, moved in an alternating movement by the connecting rod 4.
- a spring 21, disposed between the frame B and the lever 10 axially presses this lever and, consequently , the axis 12 and the rollers 13 and 14 which it carries in the direction of the mobile 15.
- the radius of the roller 14 is given by the distance between the center of the axis 12 and the track 20b, the roller 13 pressing against the track 20a.
- the surface of revolution of the roller 14 is slightly convex as shown in Figure 4.
- the tracks 20a and 20b are stamped in a stamped steel sheet 22 attached to an imprint of complementary shape, which has the end of the mobile 15 molded from plastic and held by screws 23.
- the end of the pivot 16 engaged in the axial bore of the mobile 15 has an axial recess 24 with a conical bottom centered on the axis of the pivot 16.
- This recess 24 receives a ball 25 whose cap exceeds the end of the pivot 16 and serves abutment surface against which the bottom of the stamped steel sheet 22, which could also have a spherical shape, is pressed by means of the spring 21 (fig. 1) of the lever 10 of the link 11, of the axis 12 and roller 13.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Sewing Machines And Sewing (AREA)
Description
La présente invention se rapporte à une machine à coudre comprenant un mécanisme d'entraînement du matériau à coudre associé à un dispositif de réglage de l'amplitude et du sens de l'entraînement du tissu, ce mécanisme comportant un arbre d'entraînement et un organe de transport du tissu, dont deux extrémités opposées sont reliées cinématiquement à cet arbre d'entraînement par deux transmissions à bielles et leviers, dont l'une définit une première trajectoire de déplacement dans une direction sensiblement parallèle à un plan de support du tissu, tandis que l'autre définit une seconde trajectoire de déplacement dans une direction sensiblement perpendiculaire à ce plan, ledit dispositif de réglage comprenant une coulisse en arc de cercle centrée sur une trajectoire décrite par une articulation entre deux bielles dudit mécanisme de transport, cette coulisse étant montée pivotante autour d'un axe passant par le centre de cette trajectoire, et des moyens palpeurs solidaires dudit axe, en prise avec cette coulisse.The present invention relates to a sewing machine comprising a drive mechanism for the sewing material associated with a device for adjusting the amplitude and the direction of the fabric feed, this mechanism comprising a drive shaft and a fabric transport member, two opposite ends of which are kinematically connected to this drive shaft by two link and lever transmissions, one of which defines a first movement trajectory in a direction substantially parallel to a fabric support plane, while the other defines a second displacement trajectory in a direction substantially perpendicular to this plane, said adjustment device comprising a slide in an arc of a circle centered on a trajectory described by an articulation between two connecting rods of said transport mechanism, this slide being pivotally mounted around an axis passing through the center of this trajectory, and means feelers integral with said axis, engaged with this slide.
Une telle machine à coudre est décrite dans le EP-Al-0 374 090. Dans cette machine à coudre, la coulisse est ménagée à l'extrémité d'un cylindre métallique, dont la face cylindrique est engagée dans un roulement pour assurer un pivotement sans jeu, garant de la précision du réglage angulaire de la coulisse. Cette solution donne des résultats tout à fait satisfaisants du point de vue de la précision, mais elle a l'inconvénient de revenir assez cher, tant en ce qui concerne l'usinage de la coulisse qui doit être d'une très grande précision, que le pivotement par roulement.Such a sewing machine is described in EP-Al-0 374 090. In this sewing machine, the slide is provided at the end of a metal cylinder, the cylindrical face of which is engaged in a bearing to ensure pivoting without play, guaranteeing the precision of the angular adjustment of the slide. This solution gives completely satisfactory results from the point of view of precision, but it has the disadvantage of being quite expensive, both with regard to the machining of the slide which must be of very high precision, as pivoting by rolling.
On a déjà proposé dans le DE-Cl-3121266 un dispositif de réglage de l'amplitude et/ou du sens de l'avance du tissu de ce genre dans lequel le guide de coulisse et/ou le coulisseau sont en matière plastique et présentent des paires de surfaces de glissement divergentes. Pour faciliter le glissement du coulisseau dans le guide de coulisse, la matière plastique choisie est à faible coefficient de frottement et peut à cet effet être formée de PTFE avec adjonction de silicone ou de poudre de graphite pour réduire le coefficient de frottement. Il n'en demeure pas moins que le frottement existe et qu'il est susceptible d'entraîner tôt ou tard une usure. En outre, le fait que les surfaces actives du guide de coulisse et/ou du coulisseau soient en matière plastique ne permet pas de garantir une longue durée de vie du dispositif.DE-Cl-3121266 has already proposed a device for adjusting the amplitude and / or the direction of advance of this type of fabric in which the slide guide and / or the slide are made of plastic and have pairs of divergent sliding surfaces. To facilitate the sliding of the slide in the slide guide, the plastic material chosen has a low coefficient of friction and can therefore be formed of PTFE with the addition of silicone or graphite powder to reduce the coefficient of friction. The fact remains that friction exists and that it is likely to cause wear sooner or later. In addition, the fact that the active surfaces of the slide guide and / or of the slide are made of plastic does not guarantee a long service life of the device.
Le but de la présente invention est de remédier au moins en partie aux inconvénients susmentionnés.The object of the present invention is to remedy at least in part the above-mentioned drawbacks.
A cet effet, la présente invention a pour objet une machine à coudre selon la revendication 1.To this end, the subject of the present invention is a sewing machine according to claim 1.
Compte tenu de la forme relativement complexe de la coulisse, il est plus simple de la former par emboutissage dans une feuille métallique que par usinage dans la masse. En outre, la précision et la reproductibilité sont assurées avec davantage de sécurité et à un moindre coût.Given the relatively complex shape of the slide, it is simpler to form it by stamping in a metal sheet than by mass machining. In addition, precision and reproducibility are ensured with greater security and at lower cost.
D'autres avantages apparaîtront à la lumière de la description qui va suivre et du dessin annexé qui illustre, schématiquement et à titre d'exemple, une forme d'exécution de la machine à coudre objet de la présente invention.Other advantages will become apparent in the light of the description which follows and of the appended drawing which illustrates, schematically and by way of example, an embodiment of the sewing machine object of the present invention.
La figure 1 est une vue en coupe selon la ligne I-I des figures 2 et 3.FIG. 1 is a sectional view along line I-I of FIGS. 2 and 3.
La figure 2 est une vue en coupe selon la ligne II-II de la figure 1.Figure 2 is a sectional view along line II-II of Figure 1.
La figure 3 est une vue en coupe selon la ligne III-III de la figure 1.Figure 3 is a sectional view along line III-III of Figure 1.
La figure 4 est une vue en coupe agrandie selon la ligne IV-IV de la figure 2.FIG. 4 is an enlarged sectional view along the line IV-IV of FIG. 2.
Etant donné que le principe du réglage de l'amplitude et du sens de l'entraînement du tissu est identique à celui qui est décrit en détail dans le EP-Al-0 374 090 susmentionné, ce principe ne sera pas expliqué à nouveau, dans la mesure où il n'est pas indispensable pour comprendre la présente invention et que le lecteur peut se reporter au document précité pour les détails relatifs à ce principe.Since the principle of adjusting the amplitude and the direction of the tissue feed is identical to that which is described in detail in the aforementioned EP-Al-0 374 090, this principle will not be explained again, in since it is not essential to understand the present invention and the reader can refer to the aforementioned document for details relating to this principle.
Le mécanisme de transport du tissu et son dispositif de réglage sont illustrés par les figures 1 à 3. Ce mécanisme comporte (fig. 3) un arbre d'entraînement 3 solidaire d'une bielle 4 dont une extrémité est articulée autour d'un excentrique 5 décrivant une trajectoire circulaire autour de l'axe de cet arbre d'entraînement 3. Cet arbre 3 porte également une came 6 contre laquelle appuie un bras d'un levier 7 dont l'autre bras est relié à une extrémité d'un organe de transport du tissu 8 par une bielle 9. Un ressort de rappel 2 tend à maintenir le levier 7 en contact avec la came 6.The fabric transport mechanism and its adjustment device are illustrated in Figures 1 to 3. This mechanism comprises (fig. 3) a
L'autre extrémité de cet organe de transport 8 est articulée à un bras d'un levier 10 dont l'autre bras est relié à la bielle 4 par une biellette 11.The other end of this
Comme illustré par la figure 4, l'axe 12 porte deux galets 13 et 14, dont l'un 13 est tronconique, qui s'engagent dans une coulisse 20 (fig. 2) ménagée dans un mobile 15 muni d'un perçage axial de section cylindrique circulaire et monté pivotant sur un pivot 16 fixé au bâti B portant le mécanisme de transport. Ce mobile 15, qui sert à régler l'amplitude et le sens d'entraînement du transporteur 8a, porte une denture 17 destinée à venir en prise avec un pignon 18 solidaire de l'arbre d'un moteur pas à pas 19 et destiné à orienter la coulisse 20 autour d'un point central de la trajectoire de l'axe 12, déplacé selon un mouvement alternatif par la bielle 4. Un ressort 21, disposé entre le bâti B et le levier 10 presse axialement ce levier et, par conséquent, l'axe 12 et les galets 13 et 14 qu'il porte en direction du mobile 15.As illustrated in Figure 4, the
Si l'on se reporte aux figures 2 et 4 pour examiner plus en détail la coulisse 20 et les galets 13 et 14, on constate que cette coulisse est formée de deux pistes en arcs de cercles concentriques 20a et 20b, dont l'une 20a est engendrée par un cône roulant sur la trajectoire de l'axe 12, tandis que l'autre 20b est engendrée par un cylindre roulant sur cette même trajectoire. Le rayon et la conicité du galet 13 par rapport à son axe de pivotement sont identiques au rayon et à la conicité de la piste 20a par rapport à l'axe de pivotement du mobile 15, de sorte que les deux axes sont coaxiaux lorsque le galet 13 est au centre de la piste 20a comme illustré par la figure 4. Des lors, le rayon du galet 14 est donné par la distance entre le centre de l'axe 12 et la piste 20b, le galet 13 appuyant contre la piste 20a. Pour éviter un coincement du galet 14 au cas où les axes de pivotement du mobile 15, d'une part, et des galets 13, 14, d'autre part, ne seraient pas parfaitement alignés, la surface de révolution du galet 14 est légèrement convexe comme illustré par la figure 4.If we refer to Figures 2 and 4 to examine in more detail the
Les pistes 20a et 20b sont embouties dans une feuille d'acier emboutie 22 rapportée sur une empreinte de forme complémentaire, que présente l'extrémité du mobile 15 venu de moulage en matière plastique et maintenue par des vis 23.The
L'extrémité du pivot 16 engagée dans le perçage axial du mobile 15 présente un évidement axial 24 à fond conique centré sur l'axe du pivot 16. Cet évidement 24 reçoit une bille 25 dont une calotte dépasse l'extrémité du pivot 16 et sert de surface de butée contre laquelle le fond de la feuille d'acier emboutie 22, qui pourrait aussi avoir une forme sphérique, est pressé par l'intermédiaire du ressort 21 (fig. 1) du levier 10 de la biellette 11, de l'axe 12 et du galet 13.The end of the
Claims (3)
- A sewing machine comprising a mechanism for feeding the material to be sewn connected to a device for adjusting the amplitude and direction of feed of this material, the said mechanism comprising a drive shaft (3) and a feed member (8), two opposing ends of which are connected kinematically to the said drive shaft (3) by two rod (4, 9, 11) and lever (7, 10) transmissions, one of which defines a first displacement path in a direction substantially parallel to a plane supporting the material to be sewn, while the other defines a second displacement path in a direction substantially perpendicular to this plane, the said adjusting device comprising an arc-shaped slide (20) centred on a path described by an articulation (12) between two rods (4, 11) of the said feed mechanism, the said slide (20) being mounted so as to pivot about a spindle (16) extending through the centre of this path, and sensing means (13, 14) integral with the said spindle (12) and in engagement with the said slide (20), characterised in that the said slide (20) is formed by a profiled metal sheet (22) mounted on a member (15) mounted so as to pivot about the said spindle (16).
- A sewing machine according to claim 1, characterised in that the pivotably mounted member (15) is made of plastics and has an axial opening of circular cylindrical cross-section engaged on a pivot spindle (16) integral with the frame (B), and in that the end of this spindle (16) abuts axially against the reverse of the profiled metal sheet (22), at least one of the two abutment surfaces having a spherical contact surface (25).
- A sewing machine according to claim 2, characterised in that one of the said abutment surfaces is formed by a ball (25) arranged in a recess (24) provided at the end of the said spindle (16).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH3780/90 | 1990-11-29 | ||
| CH3780/90A CH684415A5 (en) | 1990-11-29 | 1990-11-29 | Sewing machine. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0488956A1 EP0488956A1 (en) | 1992-06-03 |
| EP0488956B1 true EP0488956B1 (en) | 1994-11-09 |
Family
ID=4263327
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP91810918A Expired - Lifetime EP0488956B1 (en) | 1990-11-29 | 1991-11-26 | Sewing machine |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US5186116A (en) |
| EP (1) | EP0488956B1 (en) |
| JP (1) | JPH04292192A (en) |
| CN (1) | CN1061817A (en) |
| BR (1) | BR9105188A (en) |
| CH (1) | CH684415A5 (en) |
| DE (1) | DE69105100T2 (en) |
| ES (1) | ES2065663T3 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6968793B2 (en) * | 2003-12-15 | 2005-11-29 | Shing Ray Sewing Machine Co., Ltd. | Transverse longitudinal-cylinder sewing machine |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2218287A (en) * | 1936-12-31 | 1940-10-15 | Union Special Machine Co | Feed mechanism for sewing machines |
| US2711145A (en) * | 1952-01-25 | 1955-06-21 | Vittorio Necchi S P A | Feed regulating means for a sewing machine |
| FR1401129A (en) * | 1963-08-30 | 1965-05-28 | Necchi Spa | Improvements to devices for the execution of profiled seams |
| JPS545139Y2 (en) * | 1971-06-19 | 1979-03-06 | ||
| US4095540A (en) * | 1977-02-28 | 1978-06-20 | The Singer Company | Sewing machine stitch regulating mechanisms |
| US4183310A (en) * | 1978-12-21 | 1980-01-15 | The Singer Company | Feed and loop taker module for a sewing machine |
| DE3121266C1 (en) * | 1981-05-29 | 1983-01-13 | Dorina Nähmaschinen GmbH, 7500 Karlsruhe | Control link for the feed and / or the stitching device of a sewing machine |
| DE3234688C1 (en) * | 1982-09-18 | 1983-08-25 | Dorina Nähmaschinen GmbH, 7500 Karlsruhe | Feed control for a sewing machine |
| JPS6073479U (en) * | 1983-10-26 | 1985-05-23 | 蛇の目ミシン工業株式会社 | Feed fine adjustment device for sewing machines |
| DE3436366C2 (en) * | 1984-10-04 | 1986-10-02 | Pfaff Haushaltmaschinen Gmbh, 7500 Karlsruhe | Sewing machine for making a sewing pattern |
| JPH0427516Y2 (en) * | 1986-05-16 | 1992-07-01 | ||
| CH677804A5 (en) * | 1988-11-30 | 1991-06-28 | Mefina Sa | |
| US4895089A (en) * | 1989-02-01 | 1990-01-23 | Ssmc Inc. | Stepper driven work feed patterning for sewing machines |
-
1990
- 1990-11-29 CH CH3780/90A patent/CH684415A5/en not_active IP Right Cessation
-
1991
- 1991-11-26 ES ES91810918T patent/ES2065663T3/en not_active Expired - Lifetime
- 1991-11-26 EP EP91810918A patent/EP0488956B1/en not_active Expired - Lifetime
- 1991-11-26 CN CN91111209.XA patent/CN1061817A/en active Pending
- 1991-11-26 DE DE69105100T patent/DE69105100T2/en not_active Expired - Fee Related
- 1991-11-28 BR BR919105188A patent/BR9105188A/en not_active Application Discontinuation
- 1991-11-28 JP JP3314960A patent/JPH04292192A/en active Pending
- 1991-11-29 US US07/798,916 patent/US5186116A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| BR9105188A (en) | 1992-07-21 |
| US5186116A (en) | 1993-02-16 |
| ES2065663T3 (en) | 1995-02-16 |
| DE69105100D1 (en) | 1994-12-15 |
| CH684415A5 (en) | 1994-09-15 |
| JPH04292192A (en) | 1992-10-16 |
| EP0488956A1 (en) | 1992-06-03 |
| DE69105100T2 (en) | 1995-04-06 |
| CN1061817A (en) | 1992-06-10 |
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