US20020050239A1 - Device, method and needle plate for execution of overcasting seams and seams obtained thereby - Google Patents

Device, method and needle plate for execution of overcasting seams and seams obtained thereby Download PDF

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Publication number
US20020050239A1
US20020050239A1 US09/983,669 US98366901A US2002050239A1 US 20020050239 A1 US20020050239 A1 US 20020050239A1 US 98366901 A US98366901 A US 98366901A US 2002050239 A1 US2002050239 A1 US 2002050239A1
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US
United States
Prior art keywords
auxiliary
main
tab
slot
sewing
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.)
Abandoned
Application number
US09/983,669
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English (en)
Inventor
Marco Zoia
Giuseppe Pczzi
Roberto Sanvito
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.)
Rimoldi Necchi Srl
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Rimoldi Necchi Srl
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 Rimoldi Necchi Srl filed Critical Rimoldi Necchi Srl
Assigned to RIMOLDI NECCHI S.R.L. reassignment RIMOLDI NECCHI S.R.L. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: POZZI, GIUSEPPE, SANVITO, ROBERTO, ZOIA, MARCO
Publication of US20020050239A1 publication Critical patent/US20020050239A1/en
Abandoned legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B73/00—Casings
    • D05B73/04—Lower casings
    • D05B73/12—Slides; Needle plates
    • 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

Definitions

  • the present invention relates to a device for execution of overcasting seams
  • a device for execution of overcasting seams comprising at least one main needle carrying a respective sewing thread, movable with a rectilinear reciprocating motion through a needle plate along which a workpiece runs following a sewing direction; at least one lower support arm alternately oscillatable around a rotation axis substantially parallel to the sewing direction of said workpiece; at least one main lower looper mounted on said lower arm in such a manner that said main lower looper is alternately movable according to an arched trajectory in a direction transverse to the sewing direction; at least one upper arm oscillatable around an oscillation axis substantially parallel to the sewing direction of said workpiece; at least one main upper looper mounted on said upper arm in such a manner that said main upper looper is alternately movable according to an arched trajectory extending astride a side edge of said workpiece in a direction transverse to the sewing direction of the workpiece itself, said main upper looper interacting with said main lower looper
  • the invention also relates to a method of executing overcasting seams comprising the steps of carrying out a main seam portion of a predetermined sewing pitch on a workpiece according to its sewing direction; carrying out an auxiliary seam portion superposed on the main seam portion and of a predetermined sewing pitch on said workpiece.
  • a needle plate for execution of overcasting seams comprising a main slot having an end portion arranged to be passed through by a main needle carrying a respective main sewing thread to make a main seam portion on a cloth workpiece moving forward on the needle plate in a sewing direction substantially parallel to a primary side of the needle plate; an auxiliary slot having an end portion arranged to be passed through by an auxiliary needle carrying a respective auxiliary sewing thread to make an auxiliary seam portion on said cloth workpiece being fed; at least one main tab formed at the primary side of said needle plate and partly bounding at least one of said slots.
  • It is a further object of the invention to provide an overcasting seam comprising a main overcasting portion having a series of sewing stitches of a predetermined pitch; and an auxiliary overcasting portion superposed on said main seam and having a series of sewing stitches of a predetermined pitch.
  • the trimming-sewing machines are equipped with a sewing device having a needle carrying a sewing thread provided with a reciprocating movement in a rectilinear direction.
  • the needle is set to pass through a needle plate on which the workpiece is designed to move forward.
  • Such a device further comprises a lower arm and an upper arm alternately oscillatable around a rotation axis parallel to the feed direction of the workpiece.
  • a lower looper carrying a respective interlinking thread is mounted in engagement with the lower arm so that the lower looper is alternately movable following an arched trajectory in a direction substantially perpendicular to the feed direction of the workpiece.
  • Mounted on the upper arm is a respective upper looper possibly provided with a respective thread, alternately movable according to an arched trajectory substantially perpendicular to the feed direction of the workpiece.
  • Cooperation between the needle, lower looper and upper looper gives rise to the desired overcasting seam.
  • a first machine usually consisting of a trimming-sewing machine carries out a first overcasting seam and a second machine disposed in series with the first machine, carries out a second overcasting seam superposed on the first seam.
  • the first and second machines are connected with each other by a transferring guide by which each cloth workpiece previously worked in the first machine, is sent to the second one.
  • the fabric parts forming the workpiece are submitted to a cutting operation to determine a perfect mating of the junction edges of said parts. Simultaneously with the cutting operation and immediately downstream of the region where this operation is carried out, the first machine is set to execute an overcasting seam causing assembling of the fabric parts forming the workpiece.
  • the cloth workpiece is then moved on along the transferring guide to reach the second machine, at which a further overcasting seam is carried out in superposition with the seam executed by the first machine.
  • the present invention aims at solving the problems encountered in the known art by proposing a device and method for execution of overcasting seams ensuring superposed seams of high quality and accuracy as regards seams of both the rectilinear and the curvilinear type.
  • a device for execution of overcasting seams comprising at least one auxiliary needle carrying a respective auxiliary sewing thread, movable with a rectilinear reciprocating motion through said needle plate; at least one auxiliary lower looper mounted on said lower arm in such a manner that said auxiliary lower looper is alternately movable following an arched trajectory in a direction transverse to the sewing direction; at least one auxiliary upper looper mounted on said upper arm in such a manner that said auxiliary upper looper is movable according to an arched trajectory extending astride a side edge of said workpiece in a direction transverse to said sewing direction, said auxiliary upper looper cooperating with said auxiliary lower looper and said auxiliary needle to give rise to formation of an auxiliary overcasting seam portion on said workpiece.
  • Said aims are further achieved by a method of executing overcasting seams wherein each stitch of the main seam portion is formed simultaneously with the formation of a corresponding stitch of the auxiliary seam portion, said main seam portion being executed with the same sewing pitch as the sewing pitch of said auxiliary seam portion, as well as by a needle plate for execution of overcasting seams having at least one auxiliary tab formed along said primary side of the needle plate substantially in alignment with the main tab, said auxiliary tab bounding said auxiliary slot at least partly.
  • FIG. 1 is a perspective view of a device and a needle plate for execution of overcasting seams in accordance with the present invention
  • FIG. 2 is a top view of the needle plate shown in FIG. 1;
  • FIG. 3 is a section of the needle plate taken along line III-III in FIG. 2.
  • a device for execution of overcasting seams in accordance with the present invention has been generally identified by reference numeral 1 .
  • Such a device 1 can be advantageously installed on machines set to carry out overcasting seams.
  • device 1 comprises at least one needle bar 2 alternately movable according to a substantially rectilinear trajectory.
  • Fastened to the needle bar 2 by appropriate locking means is at least one main needle 3 and at least one auxiliary needle 4 both oriented downwardly and carrying a main sewing thread and an auxiliary sewing thread (not shown), respectively.
  • the main needle 3 and auxiliary needle 4 move therefore integrally with the needle bar 2 in a rectilinear reciprocating motion through a needle plate 5 located below the needles and along which a workpiece runs in a sewing direction denoted by arrow “A” in the accompanying figure.
  • the main 3 and auxiliary 4 needles lie in a plane transverse to the sewing direction “A” of the workpiece.
  • needles 3 , 4 lie in a plane substantially oblique to the sewing direction “A” defining an inclination angle “ ⁇ ” therewith, of an opening included between 1° and 70°, measurable in the lying plane of the needle plate 5 .
  • Device 1 further comprises at least one lower arm 6 disposed laterally of the needle plate 5 and rigidly connected, by an end 6 a thereof, with a lower drive shaft (not shown as known by itself) alternately oscillatable around a longitudinal axis “X” thereof.
  • the lower loopers 7 , 8 are alternately movable simultaneously with each other, following an arched trajectory in a direction perpendicular to the sewing direction “A” of the workpiece.
  • the movement direction of each lower looper 7 , 8 intersects the movement direction of the respective needle 3 , 4 with which the respective sewing stitch is formed.
  • the main lower looper 7 and auxiliary lower looper 8 carry a main interlinking thread and an auxiliary interlinking thread (not shown), respectively, which are intended to be interlinked with the main sewing thread and the auxiliary sewing thread carried by the respective needles 3 , 4 to generate, as better clarified in the following, a main seam portion and an auxiliary seam portion superposed on the main seam portion, respectively.
  • the device Opposite to the lower support arm 6 and laterally of the needle plate 5 , the device further involves an upper support arm 9 connected by an end 9 a thereof to a kinematic drive mechanism (not shown as known per se) and provided, at the other end 9 b thereof opposite to end 9 a, with at least one main upper looper 10 and at least one auxiliary upper looper 11 .
  • the kinematic drive mechanism sets the upper arm 9 in motion so that both the upper loopers 10 , 11 follow a movement trajectory extending astride an edge of the workpiece in a direction substantially transverse to the sewing direction “A” of the workpiece itself.
  • the main upper looper 10 and/or the auxiliary upper looper 11 may possibly carry respective interlinking threads designed to form, together with the interlinking threads of the lower loopers 7 , 8 and of needles 3 , 4 , the stitches of the main and auxiliary seam portions to be executed.
  • the needle plate 5 has a substantially plate-like structure made up of a first portion 12 which is substantially rectangular and a second portion 13 which is substantially trapezoidal and of one piece construction with the first portion 12 from which it laterally projects in cantilevered fashion, on the opposite side with respect to a primary side 17 substantially parallel to the sewing direction “A” and defined along the perimetral extension of the needle plate 5 .
  • the needle plate 5 is provided with fastening holes 14 a, 14 b to be engaged by respective screw-threaded elements not shown.
  • the needle plate 5 can be provided with one or more central openings 15 through which one or more feed dogs operate which are part of a feeding device (not shown as known per se) acting on the workpiece to cause moving forward of same in the above-mentioned sewing direction “A”.
  • central openings 15 disposed in mutual side by side relationship are provided and they have an elongated configuration in a direction parallel to the sewing direction; also provided are two auxiliary openings 16 interposed in parallel between the central openings 15 and the primary side 17 .
  • the needle plate 5 further has a main slot 21 and an auxiliary slot 22 formed close to the primary side 17 .
  • the main slot 21 and auxiliary slot 22 are arranged to be operatively passed through by the main needle 3 and auxiliary needle 4 of the above described device, respectively.
  • each slot 21 , 22 has a substantially L-shaped conformation defined by a first stretch 21 a, 22 a substantially parallel to the primary side 17 of the needle plate 5 and a second stretch 21 b, 22 b substantially perpendicular to the first stretch 22 a and extending between the first stretch and the primary side 17 so as to break continuity thereof.
  • the first stretch 21 a, 22 a of each slot 21 , 22 has an end portion 21 c, 22 c opposite to the respective stretch 21 b, 22 b and designed to be passed through by the respective needle 3 , 4 .
  • the end portions 21 c, 22 c of slots 21 , 22 are disposed mutually in side by side relationship in a direction transverse to the sewing direction “A” and to the primary side 17 of the needle plate 5 in such a manner that the distance between the end portion 21 c of the main slot 21 and the primary side 17 is different from the distance between said primary side and the end portion 22 c of the auxiliary slot 22 .
  • slots 21 , 22 can also be formed so as to be mutually aligned along a direction substantially parallel to the primary side 17 .
  • the needle plate 5 further involves the presence of a main tab 23 and an auxiliary tab 24 formed at the primary side 17 of the needle plate 5 itself and at least partly bounding the respective main 21 and auxiliary 22 slots; said tabs each have an end edge 23 a, 24 a spaced apart from the end portion 21 c, 22 c of the corresponding slot 21 , 22 and facing away from said slots.
  • tabs 23 , 24 are substantially aligned along the primary side 17 of the needle plate 5 .
  • the end edge 23 a, 24 a of each tab 23 , 24 is preferentially in alignment with the end edge 23 a, 24 a of the other tab 23 , 24 along one and the same direction parallel to the sewing direction “A”.
  • tabs 23 , 24 on the needle plate 5 which have end edges 23 a, 24 a offset with respect to a direction parallel to the sewing direction “A”.
  • each seam portion is determined by the distance measurable between the end edge 23 a, 24 a of each tab 23 , 24 and the end portion 21 c, 22 c of the corresponding slot 21 , 22 .
  • each tab 23 , 24 should have at least one tail portion 23 b, 24 b terminating at the second stretch 21 b, 22 b, of the respective slot 21 , 22 and disposed obliquely of the primary side 17 of the needle plate 5 with an inclination converging towards the respective slot 21 , 22 away from the end portion 21 c, 22 c of said slot.
  • the tail portion 23 b of the main tab 23 is preferably oriented substantially parallel to the tail portion 24 b of the auxiliary tab 24 .
  • the tail portions 23 b, 24 b may have an inclination degree different from each other, consequently giving rise to different courses in the forward or feed movement of the different seam portions being executed.
  • the needle plate 5 further comprises a lead-in portion 25 interposed between the main tab 23 and the auxiliary tab 24 to convey the main seam portion moving forward along the main tab 23 , towards and upon the auxiliary tab 24 .
  • the lead-in portion 25 has a first end 25 a disposed at a lower position relative to the main tab 23 and a second end 25 b, opposite to the first end 25 a, of one piece construction with the auxiliary tab 24 so as to define an inclined plane extending from bottom to top away from the main tab 23 , until it becomes coincident with the upper surface of the auxiliary tab 24 .
  • the lead-in portion is defined by a chamfer extending from the auxiliary tab 24 downwardly towards the main tab 23 to accompany the main seam portion over the needle plate 5 before the main seam portion itself reaches the auxiliary tab 24 where the auxiliary seam portion is made.
  • the needle plate 5 further comprises an end portion 26 provided with a further chamfer 27 to cause the superposed seam portions from the auxiliary tab 24 to move forward.
  • the cloth workpiece is guided onto the needle plate 5 of the trimming-sewing machine, at which a trimming operation is carried out, immediately upstream of needles 3 , 4 , on the edge of the workpiece to be sewn.
  • the stroke of the main lower looper 7 has the same length as the stroke of the auxiliary lower looper 8 since both loopers are fastened to the same lower support arm 6 .
  • the auxiliary seam portion prefferably has a border height, i.e. a distance between the sewing stitch and the respective edge of the materials to be joined together, greater than the border height of the main seam portion.
  • This difference between the border heights of the seam portions is determined by the offset arrangement of needles 3 , 4 relative to the sewing direction “A” which needles act through the respective offset slots 21 , 22 of the needle plate 5 .
  • the main needle 3 since it lies in a plane transverse to the sewing direction “A”, the main needle 3 forms a stitch on the workpiece, close to the main slot 21 , which is closer to the junction edge of the fabric parts to be joined than the stitch formed by the auxiliary needle 4 at the auxiliary slot 22 .
  • the lower loopers 7 , 8 and upper loopers 10 , 11 may be provided to be mutually offset in the respective movement directions, by an extent corresponding to the distance between centers measurable between the needles 3 , 4 in a direction normal to the sewing direction “A”.
  • the main and auxiliary seam portions of the obtained overcasting seam each have a series of sewing stitches having a predetermined pitch.
  • the pitch of the sewing stitches of the main portion is the same as the pitch of the sewing stitches of the auxiliary portion and each sewing stitch of the auxiliary portion is spaced a predetermined distance from the preceding stitch of the main portion, which distance may for example correspond to half the sewing pitch.
  • the present invention solves the problems found in the known art and achieves the intended purposes.
  • the device being the object of the invention enables superposed overcasting seams to be obtained which have a high accuracy degree in the interposition between the stitches of said seams.
  • such a device enables each sewing stitch to be surely spaced from the preceding and following stitches by a desired and planned distance.
  • the auxiliary sewing stitches to be coincident with the middle point measurable between the main sewing stitches, such a configuration will not be submitted to any variation during the whole working and will give, as a final result, a precise and homogeneous double overcasting seam. This condition is made possible by the vicinity between the elements adapted to make the main seam portion or first seam and the elements adapted to make the auxiliary seam portion or second seam.
  • the workpiece is not submitted to long displacements any more, along guides or other similar conveying means bringing it from the region where the first seam takes place to the region where the second seam is executed, but it is directly treated in a single region involving execution of both seams simultaneously.
  • a needle plate 5 in accordance with the invention in association with the above-mentioned device 1 enables the quality of the obtained seams to be greatly improved because device 1 is adapted to give the best in terms of functional performance.
  • the presence of a tab 23 , 24 for each slot 21 , 22 causes each of the seam portions to be disengaged from the needle plate in an optimal manner, without causing inhomogeneity in the stitch distribution and/or creasing or puckering of the material.
  • the width of the two obtained seam portions can be managed separately and independently of each other.
  • a second seam portion of greater or smaller width or border height than the first seam portion or of same width or border height as said first seam portion.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)
US09/983,669 2000-10-27 2001-10-25 Device, method and needle plate for execution of overcasting seams and seams obtained thereby Abandoned US20020050239A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2000MI002339A IT1319249B1 (it) 2000-10-27 2000-10-27 Placca ago per l'esecuzione di cuciture a punto sopraggitto.
ITMI2000A002339 2000-10-27

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US (1) US20020050239A1 (it)
EP (1) EP1201809A3 (it)
CN (1) CN1351208A (it)
IT (1) IT1319249B1 (it)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107385695A (zh) * 2017-08-29 2017-11-24 李建刚 双面绒面料片双分缝拼接方法及面料片双分缝拼接结构
CN109680423A (zh) * 2018-08-29 2019-04-26 江苏华佳丝绸股份有限公司 一种高效率辅助肩带包边的缝纫机针板
CN114411347A (zh) * 2022-02-19 2022-04-29 沈阳金杯延锋汽车内饰系统有限公司 一次性缝纫底带辅助工装

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101169259B1 (ko) * 2005-10-27 2012-08-02 주식회사 썬스타 2본침 재봉틀용 침판
ITMI20112188A1 (it) * 2011-11-30 2013-05-31 Santoni & C Spa Macchina cucitrice e procedimento per cucire tra loro, mediante tale macchina cucitrice, almeno due lembi di tessuto sovrapposti
EP3704294B1 (en) * 2017-12-21 2023-11-15 Sip-Italy S.R.L. Societa' Benefit Sewing machine provided with a flexible modular system for the variation of the needle gauges

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1041698A (en) * 1912-08-01 1912-10-15 Willcox & Gibbs Sewing Machine Looper mechanism for sewing-machines.
US3342150A (en) * 1964-02-12 1967-09-19 Pfaff Ag G M Upper and lower border deflecting means for overedge sewing machines
US4974534A (en) * 1987-09-29 1990-12-04 Pfaff Industriemaschinen Gmbh Double chain stitch sewing machine having a looper and a looper thread spreader

Family Cites Families (4)

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Publication number Priority date Publication date Assignee Title
FR1305451A (fr) * 1960-07-18 1962-10-05 Man Sew Corp Machine à coudre à piqûres composites
DE3705263C1 (de) * 1987-02-19 1988-06-16 Union Special Gmbh Vorrichtung zum Einnaehen der Fadenkette bei Nahtbeginn an Zweinadel-UEberwendlich-Naehmaschinen
JP3067912B2 (ja) * 1992-11-10 2000-07-24 ペガサスミシン製造株式会社 ミシンのパイピング用針板
JP3644776B2 (ja) * 1996-10-17 2005-05-11 ジューキ株式会社 縁かがりミシン

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1041698A (en) * 1912-08-01 1912-10-15 Willcox & Gibbs Sewing Machine Looper mechanism for sewing-machines.
US3342150A (en) * 1964-02-12 1967-09-19 Pfaff Ag G M Upper and lower border deflecting means for overedge sewing machines
US4974534A (en) * 1987-09-29 1990-12-04 Pfaff Industriemaschinen Gmbh Double chain stitch sewing machine having a looper and a looper thread spreader

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107385695A (zh) * 2017-08-29 2017-11-24 李建刚 双面绒面料片双分缝拼接方法及面料片双分缝拼接结构
CN109680423A (zh) * 2018-08-29 2019-04-26 江苏华佳丝绸股份有限公司 一种高效率辅助肩带包边的缝纫机针板
CN114411347A (zh) * 2022-02-19 2022-04-29 沈阳金杯延锋汽车内饰系统有限公司 一次性缝纫底带辅助工装

Also Published As

Publication number Publication date
EP1201809A2 (en) 2002-05-02
IT1319249B1 (it) 2003-09-26
CN1351208A (zh) 2002-05-29
EP1201809A3 (en) 2002-12-18
ITMI20002339A1 (it) 2002-04-27

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AS Assignment

Owner name: RIMOLDI NECCHI S.R.L., ITALY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:ZOIA, MARCO;POZZI, GIUSEPPE;SANVITO, ROBERTO;REEL/FRAME:012286/0151

Effective date: 20010928

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION