Classifications

• • D—TEXTILES; PAPER
  • D05—SEWING; EMBROIDERING; TUFTING
  • D05B—SEWING
  • D05B1/00—General types of sewing apparatus or machines without mechanism for lateral movement of the needle or the work or both
  • D05B1/08—General types of sewing apparatus or machines without mechanism for lateral movement of the needle or the work or both for making multi-thread seams
  • D05B1/18—Seams for protecting or securing edges
  • D05B1/20—Overedge seams
• • D—TEXTILES; PAPER
  • D05—SEWING; EMBROIDERING; TUFTING
  • D05B—SEWING
  • D05B37/00—Devices incorporated in sewing machines for slitting, grooving, or cutting
  • D05B37/04—Cutting devices
• • D—TEXTILES; PAPER
  • D05—SEWING; EMBROIDERING; TUFTING
  • D05B—SEWING
  • D05B73/00—Casings
  • D05B73/04—Lower casings
  • D05B73/12—Slides; Needle plates

Definitions

• the present invention relates to a sewing machine of the "overlook" "cut-and- sew” type for sewing together at least two superposed flaps of textile and belonging to one or more textile articles.
• the invention further relates to a process for sewing together at least two superposed flaps of textile by means of a sewing machine of the overlock cut-and-sew type.
• the "overlock" "cut-and-sew” sewing machine can be for example a machine of the type products by UNION SPECIAL ® in one of the models from the 9M series, or the like, as described for example in the relative instruction manual and catalog, 103XQA-GR, of November 2006.
• overlock or also as overedge is in itself widely known in the sector and will therefore not be described in further detail in the present description.
• this type of sewing machine can be used for numerous applications, among which also the sewing of light-textile articles such as ladies' tights, and the like.
• These sewing machines are in particular applicable as components of known machines for assembling textile articles automatically, in which a plurality of articles are assembled to one another (for example the assembling of two tubular stocking legs to form a single textile article known as panty-hose).
• sewing machines of the overlock cut-and-sew type completely automatically perform the cutting of at least two flaps of textile, by moving appropriate sewing needles and elements of known type known as "crotchets", without any intervention by an operator.
• crotchets known type known as "crotchets”
• the type of sewing realised by sewing machines of the overlock cut-and-sew type, in which two flaps of textiles are sewn superposed on one another can in some cases exhibit an excessive thickness for an optimal use of the product, and thus can be aesthetically unattractive and uncomfortable for the wearer of the product.
• the two-stitch sewing realised by this machine enables effective sewing of the two flaps of the textile, but is excessively thick for some particular applications, for example for sewing tights and in general light textiles, with respect to which the presence of the stitching in relief can be annoying.
• the aim of the present invention is to obviate one or more of the above- described drawbacks.
• An aim of the invention is to provide a sewing machine of an overlock cut-and- sew type which enables sewing together at least two flaps of textile that are overlapping and belonging to one or more textile articles, such as to realise textile articles of high quality and substantially free of imperfections.
• a further aim of the invention is to provide a sewing machine of an overlock cut-and-sew type which enables reducing production waste.
• a further aim of the invention is to provide a sewing machine of an overlock cut-and-sew type which enables obtaining sewing of a high quality and perfectly
• a further aim of the invention is to provide a sewing machine of an overlock cut-and-sew type which enables obtaining stitched seams which are controlledly extendable to achieve a sewing effect that is wider and/or flatter with respect to known stitched seams.
• a further aim of the invention is to provide a sewing machine of an overlock cut-and-sew type which enables obtaining products having a high degree of uniformity within the range of the various articles produced.
• a further aim of the invention is to provide a sewing machine of an overlock cut-and-sew type which enables obtaining stitched seams simply, rapidly and automatically, in particular also integrating the sewing machine in an automatic machine for assembly of textile articles.
• a further aim of the invention is to provide a sewing machine of an overlock cut-and-sew type which is simple, sturdy and economical to manufacture, also in terms of modest modifications with respect to the sewing machines of known type.
• the invention further relates to a sewing machine, according to any one of the appended claims or indicated aspects, in which the upper crochet is supplied with the tying thread and the lower crochet is not supplied with the tying thread and is therefore "blind", or wherein the lower crochet is supplied with the tying thread and the upper crochet is not supplied with the tying thread and is therefore "blind", or wherein both the upper and lower crochets are supplied with the tying thread.
• the invention further relates to a sewing machine, according to any one of the appended claims or indicated aspects, wherein at least one of the seatings for passage of sewing needles is dimensioned and configured for the passage of two adjacent sewing needles.
• the invention further relates to a sewing machine, according to any one of the appended claims or indicated aspects, comprising at least two separating portions or wherein the separating portions each exhibit a thickness of at least 0.6mm or at least 0.8mm or at least 1mm.
• the invention further relates to a sewing machine, according to any one of the appended claims or indicated aspects, wherein the separating portions exhibit a longitudinal extension along an advancement direction of the flaps of textile of at least 0.5 cm, or at least 1 cm, or at least 1.5 cm.
• the invention further relates to a sewing machine, according to any one of the appended claims or indicated aspects, wherein the needle plate is made of a metal material and wherein the openings defining the seatings are realised by slot-milling of the needle plate.
• the invention further relates to a sewing machine, according to any one of the appended claims or indicated aspects, wherein the separating portions are defined by separating elements mounted on the needle plate at the corresponding mounting seatings.
• the invention further relates to a sewing machine, according to any one of the appended claims or indicated aspects, wherein the sliding line of the lateral appendage exhibits, at least in a tract extending between the passage zone of the sewing needles and an end portion of the appendage, or over a whole extension thereof, a conformation which is substantially curved and transversal with respect to a prevalent longitudinal development direction of the lateral appendage and/or to the sliding direction of said flaps of textile.
• the invention further relates to a sewing machine, according to any one of the appended claims or indicated aspects, wherein the substantially curved conformation is substantially concave or wherein the substantially curved conformation is substantially convex.
• the invention further relates to a sewing machine, according to any one of the appended claims or indicated aspects, wherein the stretching device of the tying thread from the upper crotchet and/or the lower crotchet is a stretcher blade oscillating in synchrony with the sewing needle-bearing device.
• the invention further relates to a sewing machine, according to any one of the appended claims or indicated aspects, wherein the sewing machine is automatic and/or integrated in a machine for assembling textile articles.
• the invention further relates to a sewing machine, according to any one of the appended claims or indicated aspects, wherein the needle thread feeder and the tying thread feeder are of an active type, able to actively supply the thread to the needles or the crotchets or wherein the needle thread feeder and the tying thread feeder are passive and able to passively supply the thread which is pulled directly by the needles or crochets.
• the invention further relates to a needle plate according to the characteristics indicated in any one of the claims or aspects indicated in the following.
• the invention further relates to a needle-bearing device according to the characteristics indicated in any one of the claims or aspects indicated in the following.
• the invention further relates to a sewing device of the overlock cut-and-sew type, comprising at least a needle plate and at least three sewing needles, according to the characteristics denoted in any one of the claims or aspects indicated herein below.
• the invention further relates to a machine for assembling textile articles comprising a sewing machine according to any one of the appended claims or the aspects indicated herein.
• the invention further relates to equipment for a sewing machine of an overlock cut-and-sew type for sewing together at least two flaps of textile that are overlapping and belonging to one or more textile articles, the equipment comprising at least a needle plate suitable for supporting at least two overlapping flaps of textile of one or more textile articles which are sliding for forming sewing stitches, the needle plate being provided with through-openings defining respective seatings for passage of sewing needles and at least a lateral appendage defining a sliding line for the sewing stitches; and further comprising at least a sewing needle-bearing device, provided with three sewing needles mounted on said sewing needle-bearing device, reciprocally flanked, aligned to one another and supplied with respective sewing threads, the sewing needles being suitable for passing through the seatings of the needle plate for sewing the overlapping flaps of textile, the needle plate being provided with at least three of said seatings for passage of the sewing needles, each of the seatings for passage of the sewing needles being configured for being crossed by at least a
• figure 1 is a perspective view of some components of a sewing machine according to an embodiment of the present invention.
• figure 2 is a perspective view of some components of a sewing machine according to an embodiment of the present invention.
• figure 3 is a larger-scale view of a component of figure 1 , in particular a needle- bearing device;
• figure 4 is a larger-scale view of a component of figure 1 , in particular a lower crotchet;
• figure 5 is a larger-scale view from above of a component of figure 1, in particular a needle plate;
• figure 6 is a detail of the sewing machine of figure 1 relating to a forming step of the sewing stitches, with a needle plate sectioned for the sake of clarity;
• figure 7 is a view from above of a forming step of sewing stitches on two flaps of textile, at the needle plate of figure 5;
• figure 8 is a front view in section of the needle plate of figure 7, with the sewing stitches illustrated, realised at the needle plate;
• figure 9 is a plan view of two flaps of textile sewn with a process according to an embodiment of the present invention, as illustrated in figure 7, in which the textiles have been partially separated, stretching the stitches sewn;
• figure 10 is a lateral view of the two flaps of textile of figure 9, sewn using a process according to an embodiment of the present invention and partially separated by stretching the stitches sewn.
• 1 denotes in its entirety a sewing machine of an overlock cut-and-sew type for sewing together at least two flaps 3 a, 3b of textile that are overlapping and belonging to one or more textile articles.
• FIG 1 illustrates some essential components of the sewing machine 1.
• the remaining parts of the sewing machine 1 are of known type and therefore are not illustrated in the accompanying drawings and are not described in detail in the present description.
• the sewing machine 1 comprises at least a needle plate 2 able to support at least two superposed flaps 3a, 3b of textile, of one or more sliding textile articles, for forming sewing stitches.
• the needle-bearing plate 2 is provided with through-openings defining respective seatings 4 for the passage of sewing needles 5 and at least a lateral appendage 6 defining a sliding line 7 for the sewing stitches 10a, 10b, 10c.
• the needle-bearing plate 2 is provided with at least three seatings 4 for passage of sewing needles 5, each of the seatings 4 for passage of sewing needles 5 being configured such as to be crossed by at least a respective sewing needle 5.
• the needle-bearing plate 2 is provided with respective separating portions 8 able to at least partly separate each seating for passage of sewing needles 5 from the seatings 4 for the passage of adjacent sewing needles 5, at least at the passage zone 9 of the needles 5, so as to enable forming at least three sewing stitches 10a, 10b, 10c that are distinct and reciprocally distant from one another.
• Each of the seatings 4 for the passage of sewing needles 5 can be dimensioned and configured for passage of a single and corresponding sewing needle, as in the embodiment illustrated in the appended drawings.
• the seatings 4 for the passage of sewing needles 5 can be entirely separate from one another over the whole extension thereof by means of the separating portions 8.
• the seatings 4 for the passage of sewing needles 5 can be defined by through-openings that are entirely distinct from one another.
• the needle plate 2 can comprise at least two separating portions or in which the separating portions 8 each exhibit a thickness of at least 0.6mm or at least 0.8mm or at least 1mm.
• the separating portions 8 can exhibit a longitudinal extension along an advancement direction of the flaps 3 a, 3 b of textile of at least 0.5 cm, or at least 1 cm or at least 1.5 cm.
• the needle plate 2 can be made of a metal material and the openings defining the seatings 4 can be realised by slot-milling of the needle plate 2.
• the separating portions 8 can be defined by separating elements mounted on the needle plate 2 at corresponding mounting seatings.
• At least one of the seatings 4 for sewing needle 5 passage can be dimensioned and configured for enabling passage of two adjacent sewing needles 5, and therefore four needles 5 can be provided, passing in three seatings 4, two needles 5 being passing in a common seating.
• the sewing machine 1 further comprises at least a sewing needle-bearing device 11 , such as for example a needle-bearing bar.
• the sewing machine 1 further comprises at least three sewing needles 5 mounted on the sewing needle-bearing 11 device, reciprocally flanked, aligned to one another and supplied with respective sewing threads 10 for needles.
• the sewing needles 5 are suitable for passing through the seatings 4 of the needle plate 2 for sewing the overlapping flaps 3 a, 3b of textile.
• the needles 5 can be mounted on the needle-bearing device 11 with a reciprocal distance defined by an interaxis comprised between 1.4 e 2.8mm, or between l.,5 and 2.5mm or between 1.6 and 2.0mm, corresponding to the distances between the eyelets 19 of the needles 5 from which the respective sewing threads exit.
• the needles 5 can be equi-distanced, being mounted on the needle-bearing device (11) at equal distances between adjacent needles (5).
• the needles can be mounted with different interaxes between them.
• the needles can be of a same size and can be supplied with identical threads, or different threads of the same size.
• the needles can exhibit different sizes and be supplied with threads of different sizes.
• the sliding line of the lateral appendage 6 exhibits, at least in a tract extending between the sewing needle 5 passage zone 9 and a front end portion of the appendage 6, or over the whole extension thereof, a substantially straight conformation that is transversal with respect to a prevalent longitudinal direction of the lateral appendage 6 and/or the sliding direction of the flaps 3a, 3b of textile.
• the lateral appendage 6 can exhibit a front portion 6a having a narrowed end, having a thickness, measured in a through-plane for an upper rest surface of the needle plate 2, of less than 2 mm or less than 1 mm or less than 0.5 mm.
• the lateral appendage 6 can exhibit a rear base portion 6b, opposite the front end portion, having a transversal thickness at the longitudinal extension comprised between 4 mm and 7 mm, or between 5 mm and 6.5 mm, or between 5.5 e 6 mm.
• the lateral appendage 6 can exhibit, at the passage zone 9 of the sewing needles 5, a thickness 6c transversal to the longitudinal extension, comprised between 3 mm and 6 mm, or between 4mm and 5.5mm, or between 4.2 and 5mm.
• the transversal thickness can be greater than 3mm, or greater than 3.5mm, or greater than 4 mm, or greater than 4.2mm.
• the sliding line 7 of the lateral appendage 6 can exhibit, at least in a portion extending between the passage zone 9 of the sewing needles 5 and a terminal end of the appendage 6, or in all the extension thereof, a substantially curved conformation that is transversal with respect to a prevalent longitudinal extension direction of the lateral appendage 6 and/or to the sliding direction of the flaps 3a, 3b of textile.
• the substantially curved conformation can be substantially concave or substantially convex.
• At least the lateral appendage 6 defining a sliding line and/or at least one of the separating portions 8 and/or all the separating portions 8 can be inferiorly terminated or tapered to allow for passage of the lower crochet in proximity of the needle plate 2.
• the sewing machine 1 can further comprise an advancing device (not illustrated as of known and conventional type) able to advance the flaps 32a, 3b of superposed textile along an advancement direction with respect to the needle plate 2 during a sewing operation.
• an advancing device not illustrated as of known and conventional type
• the sewing machine 1 can further comprise a device 12 for cutting the flaps 3 a, 3b of superposed textile at a cutting line 20 of the textile, in proximity to and upstream of the lateral appendage 6 along the advancement direction of the flaps 3a, 3b of textile, as illustrated in figure 7.
• the sewing machine 1 can further comprise at least a thread feeder for needles 5 able to supply sewing thread 10 to the needles 5 of the sewing machine.
• the sewing machine 1 further comprises at least a lower crochet 14 and at least an upper crochet 15, able to contribute to the forming of the stitches 10a, 10b,
• the sewing machine 1 further comprises at least a tying thread feeder 16 able to supply tying thread to at least from between the upper crochet 15 and the lower crochet 14.
• the lower crochet 14 is supplied with the tying thread 17 and the upper crochet 15 is not supplied with the tying thread 17 and therefore is of the "blind" type.
• the upper crochet 15 can be supplied with the tying thread 17 and the lower crochet 14 can be not supplied with the tying thread 17 and therefore of the "blind" type.
• both the upper crochet 15 and the lower crochet can be supplied with the tying thread 17.
• the lower crochet 14, supplied with tying thread 17 contributes to the formation of the sewing stitches 10a, 10b, 10c with the respective tying thread 17 which cooperates with the sewing thread 10, while the upper crochet 15, not supplied, or "blind", contributes to the forming of the sewing stitches 10a, 10b, 10c by operating on the tying thread 17 supplied by the lower crochet 14.
• the sewing machine 1 further comprises a stretcher device 18 of the tying thread 17 from the upper crochet 15 and/or from the lower crochet 14.
• the stretcher device 18 of the tying thread 17 from the upper crochet 15 and/or from the lower crochet 14 can be for example a stretcher blade oscillating in synchrony with the sewing needle-bearing device 11.
• the thread feeder 13 for needles 5 and the thread feeder 16 of tying thread can be of the active type, able to actively supply the thread to the needles 5 or to the crochets, or alternatively the needle thread feeder 13 and the tying thread feeder 16 can be of the passive type and able to passively supply the thread which is pulled directly by the needles 5 or by the crochets.
• the sewing machine 1 can comprise four of the sewing needles 5 mounted on the needle-bearing device 11 and the needle plate can be provided with four of the openings for the passage of sewing needles 5.
• the invention further relates to an equipment for a sewing machine 1 of the overlock sew-and-cut type, the equipment comprising at least a needle plate 2 and at least three sewing needles 5, such as to enable the formation of at least three sewing stitches 10a, 10b, 10c distinct and reciprocally distanced from one another, as described above.
• the equipment essentially comprises the components illustrated in figure 1.
• the sewing machine 1 can be automatic, in particular in the case in which it is integrated in a machine for assembly of the textile articles.
• the invention further relates to a machine for assembling textile articles, of known type and thus not described in the present text, comprising a sewing machine 1 of the above-described type.
• the sewing machine will not be described in greater detail as the remaining parts thereof are conventional and of known type.
• the present invention further relates to a process for sewing together at least two superposed flaps 3a, 3b of textile with a sewing machine 1 of the overlock cut- and-sew type, comprising at least steps of: providing at least two superposed flaps 3a, 3b of textile at a needle plate 2 of a sewing machine 1 of the overlock cut-and-sew type, the needle plate 2 being provided with at least three openings, at least partially distinct from one another, for the passage of sewing needles 5; advancing the flaps 3a, 3b of textile with respect to the needle plate 2; progressively cutting a lateral portion of the flaps 3a, 3b of textile; causing each of the three openings for the passage of sewing needles 5 to be passed through by at least a respective sewing needle supplied with a respective sewing thread 10, such that the at least three reciprocally-flanked sewing needles 5 sew the flaps 3a, 3b of textile to each other, realising at least three distinct sewing stitches 10a, 10b, 10c, cooperating with at least
• the invention further enables sewing together at least two superposed flaps of textile belonging to one or more textile articles, realising textile articles of high quality and substantially free of imperfections.
• the invention further enables obtaining high-quality and perfectly "closed” seams in the join points between the two flaps of textile and/or reducing production waste.
• the invention further enables obtaining seams that are extendable in a controlled way such as to provide a wider stitching effect and/or a flatter stitching effect with respect to the known stitching.
• the invention further enables obtaining productions with high levels of uniformity between the various articles produced.
• the invention further enables realising stitching simply, rapidly and automatically, in particular also by integrating the sewing machine in an automatic machine for assembling textile articles of known type.
• the invention is also simple, sturdy and relatively economical to manufacture, and guarantees high standards of repeatability and safety.

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• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Sewing Machines And Sewing (AREA)
• Treatment Of Fiber Materials (AREA)

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