Classifications

• • D—TEXTILES; PAPER
  • D05—SEWING; EMBROIDERING; TUFTING
  • D05B—SEWING
  • D05B73/00—Casings

Definitions

• a sewing machine comprising a frame having in the ns two substantially horizontal arms with which are associated with the ns a bar-ai gui lle and its control mechanism, for the 'One, and at least one drive mechanism for the material to be sewn and / or a loop sensor device, for the other, these arms projecting from the side of a connecting column.
• the frame comprises, on the one hand, a structure made of synthetic material, plastic material for example, forming a support key for the machine on which stands at least one flange- sup ⁇ port and, on the other hand, carried by this fiasoue, a resistant framework presenting a general shape of U whose branches form, respectively, at least one Dartie of the first and second of said arms and whose bottom constitutes at least part of the column.
• the synthetic material structure has a plurality of housings for positioning the frame on the structure, the fixing of the first on the second being obtained by flanges enveloping the framework in various places, fixed removably on the structure by screws.
• the present invention aims to overcome these drawbacks.
• Figure 1 is an elevation with partial cutaway
• Figure 1A is a section along A-A of Figure 1 and Figure 1B is a section along B-B of this same figure;
• Figure 2 is a view, on a larger scale, of Part II of Figure 1;
• Figure 3 is a sectional view along III-III of Figure 2 and Figure 3A is a view of an organ appearing in Figure 3;
• Figure 4 is a view similar to that of Figure 2 showing a first alternative embodiment of a part of the cou ⁇ dre machine according to the invention
• Figure 5 is a sectional view along V-V of Figure 4 and Figure 5A is a view of an organ appearing in Figure 5;
• Figure 6 is a view similar to that of Figure 2 showing a second alternative embodiment
• Figure 7 is a sectional view along VII-VII of Figure 6 and Figure 7A shows a member appearing in Figure 7, in another working position.
• the sewing machine visible in FIG. 1 has a housing 1 formed by assembling two shells, such as shell 1 a, which also constitutes one of the two elements of the frame of the machine, image of which is described and illustrated in document EP 337 952 A1 previously cited.
• such a frame is constituted by the shell 1 a and by a resistant U-shaped frame, 2, having , in this case, in the form of a hollow body of hexagonal section, removably attached to this shell using three devices generically indicated by the reference 3 and whose structural features will be described later.
• the positioning of the frame 2 on the frame 1a is achieved by suitably profi le ribs, protruding from the bottom of the frame and the structural details of which will be indicated later by referring, in particular, in Figures 1, 1 A, 1 B and 2.
• the machine shown in FIG. 1 comprises a needle bar 4, a control mechanism 5 bar-ai guille, a drive mechanism for the sewing material and a loop sensor device, both indicated by the reference 6, these various elements being simply sketched in the drawing in the form of rectangles.
• All of these members are driven, in a traditional manner on, from a motor 7 by means of a set of pulleys and belts, indicated generically by the reference 8, controlling two motor shafts 9 and 10, respectively, passing through the upper arm of the frame 2, for the shaft 9, and the lower arm of the latter, for the shaft 10.
• Bearings not shown ensure pivoting and holding in the centered position and horizontal axes 9 and 10 in the respective arm of the frame.
• the axes 9 and 10 are coupled to the mechanisms 5 and 6 respectively in a conventional manner in the field.
• each fixing device 3 comprises, in substance, the elements which will now be described.
• the positioning of the frame 2 on the shell 1 a is ensured, according to the invention, by a series of duly profiled ribs.
• a series of duly profiled ribs there are seven of them, namely two pairs of identical vertical ribs 11 a and 11 b, respectively 12a and 12b, which comprises the upper part of the shell 1 a (fig. 1 and 2), a horizontal rib 13, intended to cooperate with the bottom of the U formed by the frame 2 (FIG. 1A), and a supplementary payment of ribs 14a and 14b, projecting from the lower part of the housing shell ( Figure 1 B).
• the ribs of each pair of ribs are parallel to each other and are connected in pairs by two spacers 11 c and 11 d, 12c and 12d, 14c and 14d, for the ribs 1 1 a, 11 b; 12a, 12b; 14a, 14b, respectively.
• the cross section of these spacers is trapezoidal.
• the rib 11a has a cut-out 1 1 e delimiting on the edge of this rib two bearing surfaces 11f and 11g, the respective inclination and the spacing of which correspond substantially. to those of a portion of the external lateral surface of the upper branch of the framework 2.
• the ribs 11b, 12a and 12b comprise corresponding cutouts of the same shape and dimensions. In doing so, as soon as the framework 2 is placed, as illustrated, in contact with the bearing surfaces of the set of ribs 11 a, 11 b, 12a and 12b, this framework occupies, relative to the shell 1 a, a position perfectly challenged in the vertical direction in FIG. 1 of the drawing.
• the positioning of the frame 2 in the horizontal direction is provided by the rib 13 already mentioned which we see in Figure 1 A that it has a cutout of shape and dimensions identical to those of the ribs 1 1a, 11b, 12a and 12b.
• ribs 14a and 14b (fi gure 1 B), it will be noted that, contrarily to the ribs 11 a and 11 b, their portion forming a seat for the lower branch of the framework 2 has a completely rectilinear profile, without no cutting, so that the ribs 14a and 14b ensure the po ⁇ sitioning of the frame on the frame only in the perpendicular direction in the plane of Figure 1 of the drawing (support of the frame 2 against the ribs 14a and 14b under the action of the clip 15).
• the frame 2 is fixed to the frame that constitutes the keel 1a of the housing by three flanges constituted by clips, such as the cli p 15 shown in Figure 3A.
• These clips are each formed by a segment of metal tape, made of spring steel for example, having a general shape of W, the free ends of which are wound at 15a and 15b to form a sort of hook.
• the distance separating these hooks is much greater than that taken between the spacers 11 c, 11 d; 12c, 12d; 14c and 14d, already cited.
• the ratio between the distance between the hooks 15a and 15b and the distance between the spacers 1 1 c and 1 1 d is of the order of 1 , 4 approximately: this ratio can, of course, be different according to the type of material chosen for the clip 15 as well as according to the importance of the force which one wishes to exert on the frame 2, when the clip is mounted as shown in Figure 3.
• the clip is pressed against the spacer 1 1 c, and more particularly the bevelled face thereof, then it is tightened by bringing the hook 15b of the hook 15a until this hook 15b comes be in front of the passage delimited by the spacer 11 d and the framework 2, then we engage the branch of the clip carrying this hook in this passage until the hook is beyond this spacer and we leave the clip relax to occupy the position illustrated in the drawing.
• the dimensions of the clip 15 are such that, in this position, it comes to rest on the frame 2 with the most projecting portion, 15c (FIG. 3A), from the bottom of the W of the clip, at the same while it is in close contact with the spacers 1 1 c and 1 1 d by its hooks 15a and 15b as well as by the portions of its two branches which are adjacent to them.
• the force F exerted by a clip, such as the clip 15, on the frame 2 is of course dependent on the dimensions of the latter and on the nature of the material which constitutes it. It should be sufficient to secure the frame 2 on the shell 1a of the housing 1, in the position fixed by contact with the bearing surfaces (such as the surfaces 11f and 11g - Figure 3) pre ⁇ views to this effect on the ribs 1 1 a, 11 b, 12a, 12b, 13 and 14a, 14b, both during the handling and transport operations of the sewing machine and, of course, during the operation of the latter. this.
• a clip in a sewing machine of the type described, the importance of the mechanical forces transmitted to the frame 2 by the drive mechanisms of the needle bar or the loop sensor, by example, is relatively reduced and that the part of these forces which affects the fixing clips is also reduced, so that such a clip could for example be formed by forming a section of steel tape- spring, with a thickness of the order of 4 to 5 / 10ths of a mm and a width of ten millimeters.
• the overall dimensions of a clip may be 7 to 8 cm in width (distance from the hooks) and 4 to 5 cm in height.
• the fixing of the framework 2 is also ensured by means of elastic clips, such as the clip 150 (FIG. 5A).
• Such a clip which in substance also has a general shape in W, has at the free ends of its two branches two portions 150a and 150b, folded in V, to form sorts of hooks by les ⁇ which the clip wraps and takes on the lateral and dorsal faces of the spacers 11c and 11d already mentioned.
• the clip 150 of the present variant is mounted by spreading its two branches, for example by placing the " hook "150a resting on the spacer 11 c and then making the clip tilt by a pivoting movement, in the anti- time and around this spacer while sufficiently spacing the two branches of the cli p to allow the "hook" 150b to pass under the spacer 1 1 d and behind it.
• the clip is then left to slightly deten ⁇ so that it occupies the position illustrated in FIG. 5.
• the three fixing cli ps that the sewing machine according to the invention comprises are of identical structure and are mounted in the same way.
• each device for fixing the frame 2 to the shell 1a of the housing of the machine comprises, essentially, two main parts, namely a locking stirrup 16 and a control lever 17.
• the lever 17 is constituted by a thread-like frame.
• U for example metallic, whose free ends of its branches are bent at 90 ° at 17a and 17b and are wound on themselves, in their intermediate part, to form scrolls 17c and 17d (FIG. 6).
• This lever 17 is engaged, by its ends 17a and 17b, in openings 1 1 h and 11 i through the ribs 11 a and 1 1 b, respectively, and forming "bearing" for the lever 17.
• This lever can therefore be tilted by pivoting its ends 17a and 17b in said openings 1 1 h and 1 1 i.
• the stirrup 16 is also constituted by a thread-like U-shaped frame, the loose ends 16a and 16b of which are bent at 90 'and are pivotally mounted by engagement, with play, in the volu ⁇ yours 17c and 17d, respectively, of the lever 17.
• the stirrup can therefore be tilted with respect to this lever while following the latter in its own basement.
• each of the U-shaped branches of the stirrup 16 is subdivided into five sectors 16c, 16d, 16e, 16f and 16g. It is in fact this stirrup which is intended to ensure the maintenance of the framework 2 on the shell 1a of the housing of the sewing machine, in particular when the stirrup is driven and locked under tension in the posi ⁇ tion that it occupies in FIG.
• this position of the stirrup 16 is a stable position, insofar as the fictitious plane, passing simul- by the contact area of the legs of the stirrup 16, in particular of the sections 16d and 16e of each branch, with the framework 2 and by the longitudinal axis of the bent parts 16a and 16b of these branches, that is to say - in essence re by the pivot axis of the latter in the volutes 17c and 17d of the control lever 17, extends to the right, in the drawing (FIG. 7), of the longitudinal axis of the bent parts , 17a and 17b, of this lever, that is to say by the pivot axis of the lever 17 relative to the ribs 11 a and 11 b.
• this frame will be positioned correctly on the shell 1 a by simply placing it, by its two horizontal branches and by its vertical portion, at the junction of these branches, on the bearing surfaces provided on the ribs 1 1 a and 1 1 b, 12a and 12b, 13, 14a and 14b.
• the fixing of the framework 2 on this shell will be obtained by implementing the three clamping devices in the manner described above.
• the number of clips and pair of ribs could we make use of a number of clips and pair of ribs (such as those indicated by the references 1 1 a, 1 1 b; 12a, 12b; 14a, 14b) different from that which it has was used in the construction of the machine shown.
• the number of positioning ribs (such as the horizontal rib 13), associated with the portion of the shell 1a constituting a part of the "column" of the machine housing, could be greater than one unit. .

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

Priority Applications (1)

Applications Claiming Priority (3)

Publications (2)

Family

ID=4217994

Family Applications (1)

Country Status (15)

Families Citing this family (2)

Family Cites Families (6)

• 1990
  • 1990-05-23 CH CH1763/90A patent/CH683353A5/fr not_active IP Right Cessation
• 1991
  • 1991-05-17 DE DE69101691T patent/DE69101691T2/de not_active Expired - Fee Related
  • 1991-05-17 BR BR919105768A patent/BR9105768A/pt not_active Application Discontinuation
  • 1991-05-17 AU AU77882/91A patent/AU640022B2/en not_active Ceased
  • 1991-05-17 ES ES91909276T patent/ES2051592T3/es not_active Expired - Lifetime
  • 1991-05-17 CA CA002064087A patent/CA2064087A1/fr not_active Abandoned
  • 1991-05-17 US US07/820,650 patent/US5231942A/en not_active Expired - Fee Related
  • 1991-05-17 KR KR1019920700148A patent/KR920703908A/ko not_active Withdrawn
  • 1991-05-17 EP EP91909276A patent/EP0484485B1/de not_active Expired - Lifetime
  • 1991-05-17 WO PCT/CH1991/000119 patent/WO1991018139A1/fr not_active Ceased
  • 1991-05-17 JP JP3508431A patent/JPH05500021A/ja active Pending
  • 1991-05-21 ZA ZA913843A patent/ZA913843B/xx unknown
  • 1991-05-21 PT PT97729A patent/PT97729A/pt not_active Application Discontinuation
  • 1991-05-22 CN CN91103526A patent/CN1024824C/zh not_active Expired - Fee Related
• 1992
  • 1992-01-22 RU SU925011186A patent/RU1838480C/ru active

Non-Patent Citations (1)

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