EP3494252A1 - Device and method for sewing the toe of a tubular knitted article - Google Patents
Device and method for sewing the toe of a tubular knitted articleInfo
- Publication number
- EP3494252A1 EP3494252A1 EP17743356.2A EP17743356A EP3494252A1 EP 3494252 A1 EP3494252 A1 EP 3494252A1 EP 17743356 A EP17743356 A EP 17743356A EP 3494252 A1 EP3494252 A1 EP 3494252A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tubular knitted
- knitted article
- flexible member
- continuous flexible
- curve
- 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.)
- Granted
Links
- 238000009958 sewing Methods 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims description 9
- 230000009975 flexible effect Effects 0.000 claims abstract description 47
- 238000003780 insertion Methods 0.000 claims abstract description 19
- 230000037431 insertion Effects 0.000 claims abstract description 19
- 230000008093 supporting effect Effects 0.000 claims abstract description 13
- 210000003371 toe Anatomy 0.000 claims description 49
- 210000002683 foot Anatomy 0.000 claims description 3
- 238000012546 transfer Methods 0.000 claims description 2
- 239000004744 fabric Substances 0.000 description 10
- 238000009940 knitting Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 3
- 230000037303 wrinkles Effects 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B23/00—Sewing apparatus or machines not otherwise provided for
- D05B23/007—Sewing units for assembling parts of knitted panties or closing the stocking toe part
- D05B23/009—Toe closers
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B27/00—Work-feeding means
- D05B27/10—Work-feeding means with rotary circular feed members
- D05B27/12—Work-feeding means with rotary circular feed members rotating continuously
Definitions
- a device for closing, by means of sewing, a toe of a tubular knitted article, such as a sock, a stocking, or a leg of a pantyhose. Also disclosed is a method for closing, by means of sewing, the toe of a tubular knitted article.
- tubular knitted articles such as stockings or socks
- tubular knitted articles such as stockings or socks
- the tubular knitted article is a leg of a more complex garment, in particular a pantyhose.
- the garment can be formed by two legs and by a body that can in some cases be knitted in a single operation on a knitting machine. According to more conventional methods, the garment is produced by joining two legs, formed by respective tubular knitted articles produced separately to one another.
- the toe of the stocking or the toes of the legs of the pantyhose are closed in the same circular knitting machine that produces the garment or part thereof. More frequently, the toes of the tubular knitted articles, whether individual stockings, pantyhose legs or similar garments, are closed by sewing in separate machines, downstream of the knitting process. Sewing machines are used for this purpose, to which the tubular knitted articles are fed after they have been correctly ori- ented.
- the seam line As the closed toe of the tubular knitted article must adapt to the toe of the foot of the person wearing the garment, it is useful for the seam line to be curved rather than rectilinear and in particular to follow a convex profile, which approximates the curvature of the toes of the foot toes.
- devices have been designed, which feed the tubular knitted article to the sewing machine imposing a deformation on the toe of the tubular knitted article such that, by sewing according to a straight line, a curved seam line is obtained.
- Devices of this type are disclosed in US4,609,419 and in DE2524238.
- the area of the tubular knitted article adjacent to the - - toe is clamped between a feed belt and an opposing surface.
- the belt is an endless belt and defines a closed path.
- the active branch of the closed path draws the tubular knitted article from an insertion area to a sewing area.
- the belt forms a curve corresponding to the profile of the seam line to be formed on the toe.
- the belt follows a rectilinear path. Due to the change of curvature of the belt from the insertion area to the sewing area, in the finished article the seam line takes a convex profile, which adapts to the profile of the foot toe.
- a device for sewing a toe of a tubular knitted article comprising a continuous flexible member, configured and arranged to press with a branch thereof an end portion of the tubular knitted article against an opposing surface and to feed the tubular knitted article along a feed path from an insertion position toward and through a sewing area in which a sewing machine is arranged, for sewing the toe of the tubular knitted article.
- the branch of the continuous flexible member that presses the tubular article against the opposing surface forms a first curve.
- the continuous flexible member co-acts with a convex deflector profile, along which the continuous flexible member is guided, and which imparts to the continuous flexible member a curvature with a convexity facing the same part as the convexity of the first curve of the continuous flexible member.
- the device can also comprise an inserter, to transfer the tubular knitted article from a first position to the insertion position between the continuous flexible member and the opposing surface.
- the first curve has a convexity facing in the direction of feed of the tubular knitted article from the first position to the insertion position.
- the continuous flexible member forms, between the first curve and the convex deflector profile, a curved segment with a concavity opposite to the concavity of said first curve.
- the flexible member follows an undulating profile.
- the deflector profile can be formed by an idler wheel, or by a stationary cam.
- the deflector profile can comprise a maximum point, positioned approximately at the sewing point of the sewing machine.
- the deflector profile is adjustable at least in a direction approximately orthogonal to the feed path of the tubular knitted article.
- the idler and guide members that define the curve or curves of the flex- ible member in the insertion area of the tubular knitted article can also be adjusted.
- Said members can comprise a plurality of idler wheels and/or of stationary cam profiles, on which the continuous flexible member is guided.
- a method for sewing a toe of a tubular knitted article comprising the steps of:
- Fig. 1 shows an axonometric view of the device, including a sewing machine
- Fig.2 illustrates an axonometric view of the device with parts removed, in which the flexible member and its path are in particular visible;
- Fig.3 illustrates a lateral view of the inserter, of the flexible member and of the elements co-acting therewith in a first step of the sewing cycle
- Fig.4 illustrates a plan view of the inserter in the layout of Fig. 3;
- Figs. 5 to 12 illustrate views similar to Figs. 3 and 4 in subsequent steps of the operating cycle
- Figs. 13 to 15 show plan views of the sewing operations in subsequent steps of the operating cycle.
- a device for sewing the toes of tubular knitted articles formed by already assembled pantyhose legs Each tubular article is thus formed by one of the two legs that, joined to a panty, form a complex garment. Sewing of the toes of the two legs of a pantyhose takes place in sequence.
- the device can be easily modified to produce single tubular knitted articles, such as socks or stockings, or legs intended to be joined to each other to form a pantyhose.
- the device With initial reference to Figs. 1 and 2, the device, indicated as a whole with 1 , comprises a cluster 3 of members for inserting and feeding tubular knitted articles, and a stitcher or sewing machine 5.
- the sewing machine 5 can be an overlock sewing machine, of known type. The sewing machine sews the toe of the article and cuts a scrap of fabric, external to the seam line.
- the cluster 3 comprises a continuous flexible member 7, which can, for example, be a belt and shall be designated as such hereinafter.
- the belt 7 defines a closed path with an active branch and a return branch.
- the belt 7 is guided around two pulleys 9, 10, one of which is motorized, for example the pulley 9.
- Reference number 11 indicates a gear motor to drive the belt 7.
- Reference f7 indicates the direction of feed of the belt 7 along the closed path defined thereby.
- Adjustable idler wheels or pulleys are provided along the active branch of the belt, which impose on the belt 7 a path that forms two curves 7A, 7B.
- the first curve 7A is positioned between two idler wheels 13, 15.
- a central idler wheel 17 is positioned in an intermediate position between the idler wheels 13, 15.
- the belt 7 is guided around the central idler wheel 17 so as to follow, in substance, a curved path with a maximum at the central idler wheel.
- the second curve 7B is formed between the idler wheel 15 and a further idler wheel 19.
- a further central idler wheel 21 is positioned between the idler wheels 15, 19.
- the device is configured to handle pantyhose and therefore to process two legs simultaneously, each of which defines a respective tubular knitted article.
- the device is configured to handle single tubular knitted articles only, such as socks or stockings, it is sufficient to arrange a single curve in the closed path formed by the belt 7.
- the curves 7A and 7B are arranged with a concavity facing the area from which the tubular knitted articles arrive and a convexity facing the toe of the tubular knitted article, after it has been inserted in the device 1, as explained below.
- the tubular knitted articles are inserted under the belt 7 by an inserter, described below.
- Reference F indicates the direction of feed of the tubular knitted articles toward the sewing machine 5 along the path defined by the belt 7.
- the active segment of the belt 7 defines, in a system of Cartesian axes, of which F is the abscissa, an undulating line with two maxima, at the two central idler wheels 17, 21.
- the idler wheels 13, 15, 17, 19, 21 can be sup- - - ported idle and rotate about respective axes as a result of the movement imparted to the belt 7 by the gear motor 11.
- one, some or all of the idler wheels 13, 15, 17, 19, 21 can be adjustable.
- the position of their respective rotation axes can be adjustable, independently from one another, orthogonally to arrow F.
- an adjustment in a direction parallel to the arrow F can also be provided.
- a convex deflector profile 25 is provided between the idler wheel 19 and the idler pulley 10, along the path of the active branch of the belt 7.
- the convex deflector profile 25 is a stationary profile, formed in the manner of a cam.
- the belt 7 is guided around the convex deflector profile 25 and slides thereon. It would also be possible to replace the stationary convex deflector profile 25 with a deflector wheel, for example mounted idle, around which the belt 7 is guided.
- the convex deflector profile 25 has a convexity oriented in the same direction as the convexity of the curves 7A, 7B formed by the belt.
- the convexities of the curves 7A, 7B and of the deflector profile 25 are all oriented in the direction indicated by the arrow C. Consequently, when guided around the idler wheels 17 and 21 the belt is deflected to form a curve that has the convexity oriented in the same direction as the convexity imparted to the same belt 7 when it follows the convex deflector profile 25.
- the convex deflector profile 25 follows a curve with a maximum point 25m.
- the maximum point 25m can be advantageously positioned in the sewing area of the sewing machine 5, i.e. in the area in which the sewing needles of the sewing machine 5 act, area indicated with 27 in the drawing. The needles are not shown in the drawing.
- the idler wheels 17 and 21 can be replaced - - by cam deflector profiles, similar to the deflector profile 25.
- the idler wheels 13, 15, 19 can be completely or partially replaced by stationary cam profiles.
- both the convex deflector profile 25, and any profiles in substitution of one or more of the idler wheels 13-19 can be made of materials with a low coefficient of friction, to facilitate sliding of the belt 7.
- the device 1 comprises an opposing surface that can be formed, completely or partially, by a supporting surface 31.
- the supporting surface 31 can extend along the active portion of the path defined by the belt 7, at least in the section thereof where the belt 7 forms the curves 7A, 7B and the curve around the convex deflector profile 25.
- the supporting surface 31 is at least partially formed by a moving plate 33, provided with a substantially vertical movement, in the example, orthogonal to the direction of feed F of the tubular articles.
- the movement of the moving plate 33 is indicated by the double arrow f33 and can be controlled by an actuator 35, for example a piston-cylinder actuator, or by an electric motor or oth- er suitable actuator.
- the moving plate 33 co-acts with a moving presser 37, positioned above the supporting surface 31 and provided with a movement parallel to the movement of the moving plate 33, indicated with the double arrow f37.
- Reference number 39 indicates an actuator that controls the movement ac- cording to the double arrow f37.
- the moving plate 33 and the moving presser 37 are positioned one in front of the other to pinch there between the toe of the tubular knitted article to be sewn, as will be described below with reference to the sequence of Figs. 3-15, which show the operating cycle of the device.
- the device 1 also comprises an inserter 41, which is configured and arranged to insert pairs of legs to be sewn transferring them from a first position to a second position, indicated hereinafter as insertion position, in which the toes of the legs are between the moving plate 33 and the active branch of the belt 7.
- the insertion movement of the tubular articles performed by the inserter 41 is indicated by the arrow f41.
- the inserter 41 is con- figured to simultaneously insert two legs Gl , G2 of a pantyhose Co between the belt 7 and the supporting surface 31 and therefore has a double configuration.
- the inserter 41 can be single, i.e., configured to insert tubular knitted articles one at a time between the belt 7 - - and the supporting surface 31.
- the inserter 41 comprises two tubular members 43 A, 43B, on each of which one of the two legs Gl, G2 is inserted.
- a pair of wings, 45A, 45A and 45B, 45B respectively, can be housed inside each of the two tubular members 43A, 43B.
- the wings can be movable axially, i.e., parallel to the axis of the respective tubular member 43A, 43B, and transverse to said axis, to extract the respective leg Gl , G2 removing it partially from the tubular member 43 A, 43B, taking it between the belt 7 and the underlying supporting surface 31 , with a movement described below.
- Each tubular knitted article formed by the leg Gl or G2 can have, at the end of the toe to be sewn, an edge B that is removed by cutting after or during sewing of the toe.
- the seam line is located inside the edge B, so that this latter can be cut and removed from the finished article, leaving intact the seam that closes the respective toe of the leg Gl or G2, respectively.
- FIGs. 3 and 4 show an initial step of positioning the pantyhose Co and in particular the two legs Gl, G2.
- the wings 45 A, 45 A and 45B, 45B have been extracted transversely from the respective tubular members 43A 34B and the respective legs are stretched orthogonally to their longitudinal ex- tension.
- each tubular knitted article formed by the leg Gl or G2 has in this way been translated from a first position (Fig. 3) to an insertion position (Fig. 5).
- the respective convexities of the curves 7A, 7B of the belt 7 are facing the edges B of the two tubular knitted articles Gl, G2, which are on the opposite part of the belt with respect to the initial position.
- the moving plate 33 and the moving press- er 37 are moved toward each other (arrows f33, f37 in Fig.7) to pinch the two tubular knitted articles Gl, G2 against the wings 45 A, 45A and 45B, 45B.
- the stroke of the moving plate 33 and of the moving presser 37 is such that the total - - bending stress applied on the wings 45A, 45A and 45B, 45B is substantially zero, thereby avoiding bending strain of the wings.
- the moving presser 37 and the moving plate 33 are raised until the moving plate 33 is presses against the lower edge of the belt 7. In this way the two toes of the two tubular knitted articles Gl , G2 are pinched between the moving plate 33 and the lower edge of the belt 7.
- the moving presser 37 can be moved to a non-operating position, i.e., a raised position not in contact with the underlying tubular articles Gl, G2. This new position is represented in Figs. 11 and 12.
- the belt 7 is stationary. After reaching the position of the Figs.11 and 12, the belt 7 can start moving according to arrow f7, to feed the two tubular knitted articles Gl, G2 toward the sewing area. Each tubular knitted article Gl, G2 is engaged along a curve defined by the belt 7, between this latter and the moving plate 33.
- the belt 7 starts moving according to arrow f7 (Fig.13)
- it draws each tubular knitted article Gl, G2 by friction, according to the arrow F, along the supporting surface 31 toward the sewing area, where the sewing machine 5 is located.
- the tubular article Gl, G2 re- mains in contact without sliding with the belt 7 and therefore follows the curvature of the convex deflector profile 25. While it is being fed, at the maximum point 25m of the curve defined by the convex deflector profile 25, the tubular knitted article Gl, G2 is sewn by the sewing machine 5, as represented schematically in the plan view of Fig. 14. This figure shows an intermediate step of the operation to sew the leg Gl . - -
- Reference L indicates the seam line that has been made on half of the toe of the leg Gl by the needle (not shown) of the sewing machine 5 that acts in the point 27.
- the edge B of the toe of the tubular knitted article Gl has been cut along the area involved by the seam L, while it still remains in the area that has not reached the point 27 in which sewing takes place.
- a pantyhose Co has been completely sewn: the toes of the two tubular knitted articles represented by the two legs Gl, G2 have been sewn along curved and convex seam lines L, which approximately follow the profile of the toe of the foot.
- the subsequent pantyhose, indicated here with CI, is being sewn: the first leg Gl of the pantyhose CI has been sewn, the second leg G2 is being sewn.
- a third pantyhose C3 is standing by to be inserted into the operating position.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Sewing Machines And Sewing (AREA)
- Treatment Of Fiber Materials (AREA)
- Socks And Pantyhose (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL17743356T PL3494252T3 (en) | 2016-08-04 | 2017-07-28 | Device and method for sewing the toe of a tubular knitted article |
RS20220292A RS63057B1 (en) | 2016-08-04 | 2017-07-28 | Device and method for sewing the toe of a tubular knitted article |
HRP20220390TT HRP20220390T1 (en) | 2016-08-04 | 2017-07-28 | Device and method for sewing the toe of a tubular knitted article |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT102016000082235A IT201600082235A1 (en) | 2016-08-04 | 2016-08-04 | DEVICE AND METHOD TO SEW THE TIP OF A TUBULAR KNITTED MANUFACTURE |
PCT/EP2017/069128 WO2018024622A1 (en) | 2016-08-04 | 2017-07-28 | Device and method for sewing the toe of a tubular knitted article |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3494252A1 true EP3494252A1 (en) | 2019-06-12 |
EP3494252B1 EP3494252B1 (en) | 2021-12-22 |
Family
ID=58606297
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17743356.2A Active EP3494252B1 (en) | 2016-08-04 | 2017-07-28 | Device and method for sewing the toe of a tubular knitted article |
Country Status (12)
Country | Link |
---|---|
US (1) | US20210372019A1 (en) |
EP (1) | EP3494252B1 (en) |
JP (1) | JP7001676B2 (en) |
CN (1) | CN109790667B (en) |
ES (1) | ES2909711T3 (en) |
HR (1) | HRP20220390T1 (en) |
IT (1) | IT201600082235A1 (en) |
PL (1) | PL3494252T3 (en) |
RS (1) | RS63057B1 (en) |
RU (1) | RU2734486C2 (en) |
TW (1) | TWI772316B (en) |
WO (1) | WO2018024622A1 (en) |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3886876A (en) * | 1973-04-27 | 1975-06-03 | Andersen Hans Christian | Apparatus for the closing of the toe of a circularly knit stocking |
GB1501869A (en) * | 1974-06-03 | 1978-02-22 | Detexomat Machinery Ltd | Seaming |
JPS52152360A (en) * | 1976-06-11 | 1977-12-17 | Takatori Kikai Seisakusho Kk | Method and device for automatically sewing rectilinearly seamless stocking toe by stationary sewing machine |
GB1542827A (en) * | 1976-10-26 | 1979-03-28 | Takatori Machinery Works Ltd | Automatic method and apparatus for closing a toe end of a hose utilizing a straight line stitch |
GB8422370D0 (en) * | 1984-09-05 | 1984-10-10 | Detexomat Machinery Ltd | Hosiery toe |
IT1252800B (en) * | 1991-09-18 | 1995-06-28 | Solis Srl | AUTOMATIC SEWING MACHINE OF THE TOE OF TWO SOCKS, ESPECIALLY OF THE NECKLACES. |
JPH09168683A (en) * | 1995-12-19 | 1997-06-30 | Takatori Corp | Method for sewing toe of socks and device therefor |
ITFI20010038A1 (en) * | 2001-03-08 | 2002-09-08 | Metalworking And Finance Group | DEVICE FOR THE COLLECTION OF A TUBULAR KNITTED MANUFACTURE FROM A KNITTING MACHINE AND FOR STITCHING THE STITCH |
ITFI20010164A1 (en) * | 2001-08-28 | 2003-02-28 | Metalworking And Finance Group | DEVICE FOR THE TRANSFER OF A TUBULAR MANUFACT IN KNITTED FABRIC FROM THE MACHINE THAT PRODUCES IT BY MEANS OF CLOSING THE POINT |
ITFI20040259A1 (en) * | 2004-12-10 | 2005-03-10 | Golden Lady Co Spa | DEVICE AND METHOD TO MANIPULATE KNITTED TUBULAR ITEMS AS SOCKS OR SIMILAR TO PERFORM THE SEWING OF THE TIP |
TR200401840A2 (en) * | 2004-07-26 | 2006-08-21 | Conti Complett S.P.A. | A device for thin sewing of sock noses and the method thereof |
CN201915227U (en) * | 2010-12-01 | 2011-08-03 | 浙江汇豪科技有限公司 | Follow-up sock feeding device for end sewing machine |
CN202705671U (en) * | 2012-05-15 | 2013-01-30 | 安徽万年针织有限公司 | Stocking pressing mechanism for silk stocking sewing and crotch cutting machine |
ITMI20121604A1 (en) * | 2012-09-26 | 2014-03-27 | Boggiani Renato S R L | EQUIPMENT AND PROCEDURE FOR THE PRODUCTION OF TIGHTS |
CN205398916U (en) * | 2016-02-01 | 2016-07-27 | 王进木 | A socks body conveying mechanism for margin to seam socks production machine |
-
2016
- 2016-08-04 IT IT102016000082235A patent/IT201600082235A1/en unknown
-
2017
- 2017-07-28 PL PL17743356T patent/PL3494252T3/en unknown
- 2017-07-28 JP JP2019505481A patent/JP7001676B2/en active Active
- 2017-07-28 WO PCT/EP2017/069128 patent/WO2018024622A1/en unknown
- 2017-07-28 RU RU2019105582A patent/RU2734486C2/en active
- 2017-07-28 RS RS20220292A patent/RS63057B1/en unknown
- 2017-07-28 ES ES17743356T patent/ES2909711T3/en active Active
- 2017-07-28 EP EP17743356.2A patent/EP3494252B1/en active Active
- 2017-07-28 HR HRP20220390TT patent/HRP20220390T1/en unknown
- 2017-07-28 CN CN201780055801.XA patent/CN109790667B/en active Active
- 2017-07-28 US US16/322,672 patent/US20210372019A1/en not_active Abandoned
- 2017-07-31 TW TW106125740A patent/TWI772316B/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
CN109790667A (en) | 2019-05-21 |
EP3494252B1 (en) | 2021-12-22 |
JP7001676B2 (en) | 2022-01-19 |
RS63057B1 (en) | 2022-04-29 |
US20210372019A1 (en) | 2021-12-02 |
RU2734486C2 (en) | 2020-10-19 |
CN109790667B (en) | 2021-12-14 |
RU2019105582A (en) | 2020-09-04 |
HRP20220390T1 (en) | 2022-05-27 |
PL3494252T3 (en) | 2022-06-13 |
IT201600082235A1 (en) | 2018-02-04 |
WO2018024622A1 (en) | 2018-02-08 |
JP2019527590A (en) | 2019-10-03 |
TW201835406A (en) | 2018-10-01 |
RU2019105582A3 (en) | 2020-09-23 |
TWI772316B (en) | 2022-08-01 |
ES2909711T3 (en) | 2022-05-10 |
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