US3654883A - Thread control mechanism for sewing machines - Google Patents

Thread control mechanism for sewing machines Download PDF

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Publication number
US3654883A
US3654883A US37108A US3654883DA US3654883A US 3654883 A US3654883 A US 3654883A US 37108 A US37108 A US 37108A US 3654883D A US3654883D A US 3654883DA US 3654883 A US3654883 A US 3654883A
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United States
Prior art keywords
thread
needle
eyelet
control mechanism
bracket plate
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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
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US37108A
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English (en)
Inventor
George M Reimer
Frederick M Klose
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Union Special Machine Co
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Union Special Machine Co
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Assigned to BT COMMERCIAL CORPORATION reassignment BT COMMERCIAL CORPORATION SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: UNION SPECIAL CORPORATION
Assigned to UNION SPECIAL CORPORATION reassignment UNION SPECIAL CORPORATION RELEASED BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: BT COMMERCIAL CORPORATION
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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B47/00—Needle-thread tensioning devices; Applications of tensometers

Definitions

  • the needle thread control mechanism includes a bracket plate which is conveniently mountable on a conventional sewing machine frame and which has mounted thereon an eyelet assembly for movement along a predetermined path and selected positioning thereof along such path so as to vary the extent of a thread loop which is formed between a thread tensioning device and the needle lever thread eyelet of the sewing machine, thereby controlling the tightness of the stitch being formed.
  • This invention specifically relates to a modification or attachment 'for a conventional chainstitch sewing machine which permits ready adjustment by the machine operator of the tightness of the chainstitch in accordance withthe work being sewn,
  • the needle thread control mechanism includes a bracket plate which is configurated for mounting on the arm of the machine frame in a securely fixed position by means of a single screw type fastener.
  • the bracket plate is provided with a guideway in the form of a slot which extends transversely of the flow path of thread from the customary thread tensioning device to the customary needle lever thread eyelet and there is mounted for movement along and fixedly positioning along the guideway of the bracket plate an eyelet assembly receiving the thread with the position of the eyelet assembly controlling the extent of the loop which is formed in the thread by the movement of the needle lever thread eyelet during the operation of the machine.
  • needle thread control mechanism having two stationary thread guides arranged on the sewing machine frame in a certain spacial relationship to each other, means for changing said relationship, movable thread guide means adapted for reciprocating movement in a vertical plane to manipulate the needle thread between said stationary thread guide means, the effectiveness of said thread manipulation depending thereby on the degree of change of said spacial relationship to place more or less thread into the system to form a tighter or looser stitch.
  • a needle thread control mechanism comprising at least two stationary thread guides one of which is fixedly secured to the overhanging arm of the sewing machine, while the other one is adjustably secured in an inclined slot provided in a bracket plate fastened to the overhanging arm.
  • FIG. 1 is a fragmentary side elevational view of a conventional chainstitch sewing machine having mounted thereon the needle thread control mechanism.
  • FIG. 2 is a transverse vertical sectional view taken along the line 2-2 of FIG. 1 and shows the details of only those portions of the sewing machine to which this invention relates, and most specifically the details of the needle thread control mechanism.
  • FIG. 3 is an enlarged fragmentary generally horizontal sectional view taken along the line 3-3 of FIG. I and shows specifically the mounting of the eyelet assembly on the bracket plate.
  • FIGS. 4, 5 and 6 are enlarged schematic views showing the various thread looseness or tightness which may be obtained with the needle thread control mechanism.
  • the machine installation of the needle thread control mechanism is only a typical installation and the invention is not limited to the particular machine illustrated.
  • the illustrated machine which is identified by the numeral 10
  • the machine 10 is equipped with a reciprocating eye pointed needle 11 and a thread carrying looper 12, which looper 12 is disposed below a conventional cloth plate 13.
  • the thread carrying looper 12 is mounted and actuated in a conventional manner to have endwise needle loop seizing and shedding movements and sideways movements designed to present a thread triangle for entry of the descending needle 11.
  • the illustrated machine 10 is adapted to produce a two thread chainstitch of the type known as a 401 stitch in accordance with known federal standards.
  • the sewing machine 10 also includes a frame 14 of which a portion only of the usual overhanging arm 15 thereof is illustrated.
  • the arm 15 carries the usual needle head in which there is joumalled the usual reciprocatory needle bar 17.
  • the lower end of the needle bar carries the needle 11, and the upper end portion of the needle bar 17 is provided with an eyelet 18 which moves with the needle bar 17 and serves as a first thread take-up means.
  • the machine frame 14 is also provided with the usual adjustable thread tensioning device or means, which is identified by the numeral 20, and which is provided with the usual spring biased discs 21.
  • the machine 10 with the exception of the needle thread control mechanism which is the subject of this invention, is a conventional machine, the details of which are more fully disclosed in the patent to Attwood, et al., US. Pat. No. 3,418,955, granted Dec. 31, 1968.
  • the needle drive mechanism of the machine includes a needle lever 22 which is mounted for rocking movement on a stud 23 which is disposed transversely in the overhanging arm and journalled in suitable bearings (not shown).
  • a substantially vertically extending slot 26 of a slightly arcuate shape through which extends outwardly a needle lever thread eyelet 27 which is carried by the needle lever 22.
  • the eyelets 18 and 27 constitute the two movable needle thread guides in the control mechanism and function as thread take-up and pull off means.
  • the eyelet 27 is rigidly secured to the needle lever 22 by means of a screw 28.
  • a wire 30 having several bends formed therein.
  • the wire 30 extends first upwardly from the needle arm 15 and then towards the left, then downwardly and again towards the left, and finally a little upwardly.
  • the left end of the wire 30, as viewed in FIG. 2 is disposed in substantially a vertical plane above the slot 26, as viewed in FIG. 1. Thread passes from the eyelet 27 over the wire 30, through the eyelet 18 and down to the needle 11.
  • the wire 30 forms a fixed thread guide.
  • the needle thread control mechanism includes a generally triangular bracket plate 32 which is rigidly secured to the front wall of the overhanging arm 15 by means of a single screw 33 and forms a support surface for an eyelet assembly to be described hereinafter.
  • the screw 33 extends through a vertically elongated hole 29 in the bracket plate 32, thereby permitting the bracket plate 32 to be adjusted minutely up and down on the overhanging arm 15.
  • the screw 33' is threaded into an adapter plug 34 (FIG.
  • bracket plate 32 which, in turn, is screwed into a suitably threaded bore 35 in the frame wall of the overhanging arm 15.
  • the upper edge thereof is provided with a pair of lips 36 which extend at right angles to the plane of the bracket plate.
  • the lips 36 serve to abut the wall of the overhanging arm 15 in order to locate the bracket plate 32 thereagainst, as is clearly shown in FIG. 2.
  • the bracket plate 32 has sides 37, 38 and 40.
  • the sides 40 carries the lips 36 and, in the illustrated machine 10, serves as a locating side against a substantially overhanging extending step-like protrusion 41 in the overhanging arm wall.
  • the side 38 has no particular function and the side 37 extends approximately parallel to a slot or guideway 42 which is formed in the bracket plate 32 and which extends generally from the corner 37-38 to the corner 37-40.
  • the bracket plate 32 is so located that the general direction of the slot 42 is along a line extending approximately at 32 relative to the horizontal from the lower right to the upper left.
  • the slot 42 serves as locating means for a stationary eyelet 43 which is part of an eyelet assembly, generally referred to by the numeral 44.
  • the eyelet assembly 44 is best illustrated in FIG. 3 and may be shifted along the slot 42 and secured in any desired position thereof.
  • the eyelet assembly 44 includes a plate 45 which has threaded thereinto adjacent one end thereof a screw 46 which is also received in a base portion of the eyelet 43.
  • a spacer collar 47 is carried by the screw 46 between the plate 45 and the eyelet 43 and is of a thickness in excess of the bracket plate 32 so that it may function as a guide within the slot 42.
  • a second and larger screw 48 is threaded into the opposite end of the plate 45.
  • the screw 48 has a threaded shank portion 50 of a diameter substantially corresponding to the width of the slot 42 whereby the shank 50 also functions as a guide for the eyelet assembly 44 within the slot 42.
  • Screw 48 is also provided with a shoulder portion 51 which presses against a collar 52 carried by the shank 50. When the screw 48 is tightened down, the collar 52 cooperates with the plate 45 to clamp the bracket plate 32 therebetween and thus lock the eyelet assembly 44 in an adjusted position.
  • the eyelet 43 is arranged so that it extends in a substantially vertical plane while its thread conducting opening extends along a substantially horizontal axis.
  • FIG. 1 there has been illustrated three different paths along which thread may be conducted to the needle 11. These paths correspond to three different adjustment positions chosen at random of the stationary thread guide 43. The paths are identified as paths A, B and C. It is to be noted that these thread paths vary only between the thread tensioning' device 20 and the eyelet 27. The thread path from the eyelet 27 to the needle 11 remains constant and is over the wire 30, through the eyelet 18 and down to the needle 11. 1 g
  • the needle 11 is shown in its extreme down position with the looper l2 retracted and a needle thread loop 50 shed off from the looper 12.
  • the compounded distance of the path of travel of the needle thread between the thread tensioning device 20 and work W is approximately equal in both directions of the needle stroke.
  • some thread is always being used up during the formation of a stitch and the advancement of the work in the machine so that during an upward or downward stroke of the needle and the associated take-up means 18 and 27, a shortage of thread occurs in the system at one time or another.
  • the take-up movement of eyelets l8 and 27 will keep the needle thread taut when the needle begins to rise. This will cause the stitch to be set and due to occurring thread shortage, new thread will be pulled off from the supply.
  • the stitch formed thereby is best illustrated in FIG. 5 wherein it is shown that the needle thread loop 51 is not fully pulled up into the work W causing a stitch that is neither very tight nor very loose.
  • the compounded length of the thread path is shorter when the needle and the movable eyelets 18 and 27 are in their downward position. This means that during the downward stroke of the needle 11 and eyelets 18 and 27, less thread is added to the system than during their upward stroke. From this, it follows that no tension is built up in the thread during the downward stroke of the needle 11 since at this time there is now sufficient thread in the system. However, in forming the stitch in advancing the work W, thread is lost. Further, during the upward stroke of the needle all slack in the thread is being taken up by the eyelets l8 and 27 so that tension builds up gradually in the thread.
  • FIG. 4 The stitch resulting from the setting of the eyelet assembly 44 to produce the thread path C is illustrated in FIG. 4 where it will be readily apparent that the needle thread loop 53 extends far back on the underside of the work W. In this particular setting of the eyelet assembly 44, the loop 53 extends valmost to the next stitch.
  • the needle thread loop 53 extends far back on the underside of the work W. In this particular setting of the eyelet assembly 44, the loop 53 extends valmost to the next stitch.
  • On the following upward stroke of the needle 11 and the eyelets 18 and 27, all of the thread that has been drawn into the system will now be played out so that there is plenty of thread available. For this reason, no tension is created in the needle thread during the upward stroke of the needle and consequently no thread is pulled either out of the formed loop or for the supply during this phase.
  • the needle thread control mechanism 31 enables an operator to change at will the length of the path along which the needle thread is conducted to the needle 11 and thereby effect the production of a looser or tighter stitch. All this can be readily accomplished by simply shifting the stationary eyelet 43 along the slot 42and affixing it in the desired position.
  • a needle thread control mechanism for sewing machines of the type including a frame and a work support, and a thread carrying needle mounted in said frame for endwise reciprocatory movement towards and away from said work support, ac-
  • thread tensioning means for controlling the flow of thread from a source to said needle, a fixed thread guide along a path of thread flow between said thread tensioning means and said needle, a first movable thread take-up guide means for receiving thread in the flow of the thread from said fixed thread guide to said needle and forming a first thread loop, said first movable thread take-up guide means being operatively connected to said actuating means for forming a first thread loop upon the retraction of said needle, second movable thread take-up guide means for receiving thread in the flow of the thread from said thread tensioning means to said fixed thread guide and forming a second thread loop, said second movable thread take-up guide means being operatively connected to said actuating means for forming a second thread loop upon the projection of the said needle, and a thread guide unit mounted on said frame for receiving thread in the flow of the thread from said thread tension
  • said eyelet assembly includes a support plate, guide means on said support plate engaged in said guideway, and readily releasable clamp means carried by said support plate.
  • said guideway is in the form of a slot
  • said eyelet assembly includes a support plate carrying a pair of guides extending through said slot, one of said guides carrying a projecting thread eyelet and the other of said guides being adjustable in effective length and together with said support plate forming a clamp.
  • said support surface is defined by a separate bracket plate releasably secured to said frame, said frame having an elongated shoulder, said bracket plate having a mounting surface along one edge thereof, and a single releasable fastener securing said bracket plate to said frame.
  • a needle thread control mechanism specifically adapted for use with sewing machines of the type including a thread tensioning device and a needle lever thread eyelet
  • said needle thread control mechanism comprising a bracket plate having means for mounting the same on a frame of a sewing machine I between a thread tensioning device and a needle lever thread eyelet thereof, a guideway on said bracket plate, and an eyelet assembly mounted on said bracket plate for movement along and selective fixed positioning along said guideway, said guideway being in the form of a slot
  • said eyelet assembly includes a support plate carrying a pair of guides extending through said slot, one of said guides carrying a projecting thread eyelet and the other of said guides being adjustable in effective length and together with said support plate forming a clamp.
  • a needle thread control mechanism specifically adapted for use with sewing machines of the type including a thread tensioning device and a needle lever thread eyelet, said needle thread control mechanism comprising a bracket plate having means for mounting the same on a frame of a sewing machine between a thread tensioning device and a needle lever thread eyelet thereof, a guideway on said bracket plate, and an eyelet assembly mounted on said bracket plate for movement along

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US37108A 1970-05-14 1970-05-14 Thread control mechanism for sewing machines Expired - Lifetime US3654883A (en)

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US3710870A 1970-05-14 1970-05-14

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US (1) US3654883A (de)
JP (1) JPS548149B1 (de)
DE (1) DE2123601C3 (de)
FR (1) FR2091594A5 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3970019A (en) * 1975-12-12 1976-07-20 The Singer Company Threading apparatus for sewing machines
FR2514381A1 (fr) * 1981-10-10 1983-04-15 Union Special Gmbh Dispositif de commande de fil pour machines a coudre
US5447109A (en) * 1993-10-27 1995-09-05 Union Special Corporation Thread handling system for a sewing machine
EP2028311A3 (de) * 2007-08-22 2011-10-19 Dürkopp Adler Aktiengesellschaft Nähmaschine sowie Verfahren zum Nähen eines Nahtanfangs mit einer derartigen Nähmaschine
CN102535038A (zh) * 2010-11-15 2012-07-04 杜尔克普—阿德勒股份公司 缝纫机和用这种缝纫机缝制线缝起始部的方法
CN108277583A (zh) * 2017-01-05 2018-07-13 顾飞龙 缝纫机的上网线起缝不漏线的装置及方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011005198A1 (de) * 2011-03-07 2012-09-13 Dürkopp Adler AG Nähmaschine sowie Verfahren zum Nähen eines Nahtanfangs mit einer derartigen Nähmaschine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB627674A (en) * 1941-07-11 1949-08-12 Int Button Hole Sewing Machine Improvements in or relating to sewing machine
US2997010A (en) * 1959-03-02 1961-08-22 Samuel E Elkins Thread control device for sewing machines
US3083661A (en) * 1959-10-13 1963-04-02 Singer Mfg Co Thread pull-off for sewing machines
US3489115A (en) * 1967-07-07 1970-01-13 Rimoldi C Spa Virginio Device for simultaneously cutting the sewing threads in a sewing machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB627674A (en) * 1941-07-11 1949-08-12 Int Button Hole Sewing Machine Improvements in or relating to sewing machine
US2997010A (en) * 1959-03-02 1961-08-22 Samuel E Elkins Thread control device for sewing machines
US3083661A (en) * 1959-10-13 1963-04-02 Singer Mfg Co Thread pull-off for sewing machines
US3489115A (en) * 1967-07-07 1970-01-13 Rimoldi C Spa Virginio Device for simultaneously cutting the sewing threads in a sewing machine

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3970019A (en) * 1975-12-12 1976-07-20 The Singer Company Threading apparatus for sewing machines
FR2514381A1 (fr) * 1981-10-10 1983-04-15 Union Special Gmbh Dispositif de commande de fil pour machines a coudre
US5447109A (en) * 1993-10-27 1995-09-05 Union Special Corporation Thread handling system for a sewing machine
EP2028311A3 (de) * 2007-08-22 2011-10-19 Dürkopp Adler Aktiengesellschaft Nähmaschine sowie Verfahren zum Nähen eines Nahtanfangs mit einer derartigen Nähmaschine
CN101372797B (zh) * 2007-08-22 2013-01-02 杜尔克普-阿德勒股份公司 缝纫机和用这种缝纫机缝制线缝开头的方法
CN102535038A (zh) * 2010-11-15 2012-07-04 杜尔克普—阿德勒股份公司 缝纫机和用这种缝纫机缝制线缝起始部的方法
CN102535038B (zh) * 2010-11-15 2015-05-06 杜尔克普—阿德勒股份公司 缝纫机和用这种缝纫机缝制线缝起始部的方法
CN108277583A (zh) * 2017-01-05 2018-07-13 顾飞龙 缝纫机的上网线起缝不漏线的装置及方法

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Publication number Publication date
DE2123601C3 (de) 1979-09-13
DE2123601B2 (de) 1979-01-18
DE2123601A1 (de) 1971-11-25
FR2091594A5 (de) 1972-01-14
JPS548149B1 (de) 1979-04-12

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