US2618232A - Blind stitch sewing machine - Google Patents

Blind stitch sewing machine Download PDF

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Publication number
US2618232A
US2618232A US12076A US1207648A US2618232A US 2618232 A US2618232 A US 2618232A US 12076 A US12076 A US 12076A US 1207648 A US1207648 A US 1207648A US 2618232 A US2618232 A US 2618232A
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United States
Prior art keywords
needle
looper
loop
fabric
thread
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Expired - Lifetime
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US12076A
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English (en)
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Mikolas Franz
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Individual
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Individual
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Publication of US2618232A publication Critical patent/US2618232A/en
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    • 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
    • D05B1/24—General types of sewing apparatus or machines without mechanism for lateral movement of the needle or the work or both for making blind-stitch seams
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B85/00—Needles
    • D05B85/06—Curved needles

Definitions

  • the invention relates to machines or accessory appliances for sewing machines for producin blind stitch or pique seams in which a blind stitch needle passes-at every working strokethrough a thread loop formed by a looper as well as through the work temporarily lifted by means of a fabric bender whereupon i. e. after the return stroke of the needle, the feeding motion of the work is carried out.
  • the machines and devices hitherto disclosed for this purpose regardlessly of whether the looper travels along a path composed of rotary and longitudinal motions, or whether it executes a simple oscillating movement along a circular arc -are all characterized by the looper itself conveying the thread picked up fromthe needle in the shape of a loop to the needle entering point and holds it there until the stitch is made.
  • the looper must be provided with two nose-shaped catchers or pQinted grippers for holding the loop, and should additionally execute a motion enabling it to pass from the needle exit point directly over the fabric roll produced by the fabric bender, and then again to descend to the needle entering point.
  • the looper is open towards the fabric to be sewn, there is, the danger that the thread loop may be stripped off from the looper, and that the latter may get stuck by clamping, particularly when working, fabrics of varying thickness e. g. padded ones.
  • the passing of "the looper over the fabric roll isrealized in pique devices, having a looper oscillating along a circular'arc, in such a manner that the latter executes its oscillating motion in a plane chiefly :1
  • the object of the invention is a blind stitch and piqu device which may be used as a self contained machine, or as an accessory appliance for sewing machines, said device eliminating the above mentioned drawbacks by fixing in the range of the needle path a loop catching nib (loop catcher) by means of which the thread loop supplied to it by the looper is located above and below the needle guide for the subsequent throughstitch of the blind stitching needle.
  • a loop catching nib loop catcher
  • the looper preferably oscillating in a manner known along a circular arc, are separated from the work by a cover plate over the whole length of the mov ing range, the formation of the loop and the stitch are perfectly independent of the nature and the thickness of the work.
  • the looper path ending with the thread loop being picked up by the catcher, is located in front of the needle plane, except the portion of the path necessary for picking up the thread from the blind stitching needle, which renders possible a conveying arrangement permitting of seaming the workpiece from its very margin.
  • Fig. 1 being a lateral elevation, partly in section, of a pique device employed as an accessory to a sewing machine, immediately after the beginning of the return motion of the needle, whereas Fig. 2- shows the same device at the moment at which the needle begins its subsequent forward stroke.
  • Fig. 3 is a longitudinal .section through the pique device, seen from the right-hand side of Fig. 1, Whereas Fig. 4 is a section taken along the line IV-IV of Fig. 3.
  • Fig. 5 is a lateral elevation, and Fig. 6 a front elevation of the looper.
  • the Figs. 7 and 8 are a lateral elevation, partly in section, and a plan,
  • FIG. 9 represents a blind stitching and piqu machine according to the invention in front elevation seen from the operators side with a partial section through the fabric guiding foot, whilst Fig. 10 is a lateral elevation of the same embodiment.
  • the Figs. 11 and 1 2 are views in full size of the stationary fabric guiding foot (cover plateklii 11. ei g a pl n showin the ma n in which the stitches are made, whereas Fig. 12 is a section taken on the line 2sIII- -XII ofFig. 1 1.
  • the pique device represented in the Figs. 1-3 suitable for stitching through and, in particular, for blind stitching, is provided with a presser foot 4 (Figs. 3, 4) fastened by means of a screw 2 to a presser-bar 3.
  • the foot part of the presser foot preferably fitted with a level bottom, is ope posed to the fabric feeding direction :0, its upper side 4a, 4b obliquely sloping towards its bent-up free end, so as to form a step i.
  • a needle groove 6, curved in its longitudinal direction is provided below the step I trans versally to the feeding direction a: of the workpieces 5 to be seamed (Figs.
  • this loop catching nose I2 (Figs. 1-4) to accomplish its task it is undercut to form a rest I3 for the lower thread part of the loop I0, said rest beginning at the surface depression I I, and the recess 8, and reaching below the needle groove 6.
  • said nose is made to protrude in the upward direction somewhat beyond the edge of the needle groove 6, so that the upper thread part is freely laid above the needle groove 5, in consequence whereof the blind stitching needle I may freely enter into the thread loop ID.
  • the blind stitching needle I is arranged on an oscillating arm I6 formed as a part of a circular arc by means of a needle clamp I provided with the thread guides I 4 (Figs. 1 and 2), said arm executing oscillating movements about a journal bisecting the axis of the presser-bar 3, and being located in parallel to the fabric conveying direction X (Figs. 3 and 4).
  • a clamping (gripping) piece I'l slid on the presser-bar 3 just above the presser foot 4, is fastened in such a manner that its medium part is divided into two lateral cheeks Ila by means of a slot arranged in parallel to the axis of rotation of the oscillating arm I8, one of said cheeks being split by a transverse slot I8 into an elastic lug, and fixing the clamping piece I! on the presser-bar 3'when tightening a tension screw I9 passing through the cheek nu.
  • This clamping piece I! serves as support for the oscillating'arm I8 by passing into a stirrup (Figs.
  • the drive of the oscillating arm Hi can be realized in different manners.
  • said drive is derived from the needle bar 23 of the sewing machine for which purpose an arm 24, clamped, to the. needle bar 23, is connected to the oscillating arm I6 by way of a link 25.
  • the rotary bolt 28 carries a clamping (gripping) body 3
  • the looper 33 projecting as small foot from an oblique undercutting 36 (Figsp5, 6) of the shaft 32, and terminating in a point 31 has, seen in plan, approximately the shape of a scalene triangle, whose smallest angle determines the point 3'! of the looper. Together with the adjoining side of the triangle adjacent to the right angle, this-point 31 is unilaterally inserted in an even-faced upright lateral wall 38 of the looper 33, whereas the hypothenuse, somewhat curved outwardly in an arc-shapedmanner, forms the other lateral border edge 33 of the bottom to which a slight convexity is imparted, and which preferably slopes somewhat towards the point 31, but is more inclined towards the lateral wall 38.
  • the said bottom passes into the upper side of the looper by convexly cambering up to the lateral wall 38 e. g. along a part of the surface of a cone. so that also the upper part beginning from the point 31 slantingly ascends towards the shaft 32. and is made to enlarge laterally.
  • the looper 33 is fastened in such a manner in the clamping body 3
  • the extreme slanting position is obtained, when the looper 33 together with the shaft 32 attains its foremost position in respect to the user of the machine.
  • the pique device comprises further a fabric bender 42 (Figs. 1, '7 and 8) which executes a reciprocating motion through an aperture of the stitching (needle) plate 4
  • the drive of the fabric bender 42 is e. g. derived by way of a double-armed lever 43 from a cam 44 (Figs. 7. 8) the latter being fastened on the conveyor shaft 45, generally used in sewing machines and showing a level-faced section 48 recessed in respect to the remaining circumference which has the shape of a circular cylinder.
  • A-ftehthesneedle 1 has released/the fabrics 5 therfabricbender 42 togame: withlther fabrics 5. descends, under:- the: action of' the doubleaarmed; lever 43-..reachingthe range; of. the canrsection 46, for the duration of theyfabric; conveyance by means, at the. usual transporting devices. Inconsequence; off the for, war slanting. position or; the mam bolt. 28 the 16b9,, 33 wilL. in...the.. course. of; its; iorward. stroke, fi'nallg reach a" position soi low: that the: tower: par ofithethread loop, H): is. caughtby' the rest I he. nose: [2,. said; rest, being; located; below dle. groave: 6. (Fig. 2); whereas. the. upper. portion. is; abovethe. needle. groove.
  • the fabric guiding foot.- 61,,. forming; the star tionany" partof: the fabric. bender and? carrying at: its:v surface the: loop; catcher 68; is: rigidly fasttened': to. the; arm: 59;: of.” the: machineieheatlf. 51
  • circular cylinder is. provided to; correspond. to; the radius of the needle. path, the: right hamii 7 side-.borderfwall; tlfcrfacingtheihenif-umfootanart bender; 42 is also. provided. with; a groove; Within.
  • oij the. fabric .bender 42 is, adjusted. to a. sufiici'ent length;.throughstitching' work. can. also be carried. oi'itj nnthis-device' 55. (In a transversal shaft" 56' iournalledf,
  • sheet- (distancesheet) 12 accountingifor's I pin- 14 bent-in its lower park-backwards to the needle path and acting as a loop holder.
  • the movable fabric bender horn 15, cooperating with the fixed fabric bender foot 61 is elastically journalled in respect to the latter in a fabric bender casing 11, pivotable about an axle 16 of the machine base 52, said horn being providedin the range of the needle pathwith an aperture for the. fabric bender not shown.
  • the tiltable fabric bender holder and its driving parts are likewise lodged in the fabric bender casing 11.
  • a strongplate spring 19 acting on the carrier' 18 of the fabric" bender casing T1 keeps it permanently in the position of use, determined by a stop 80 on the carrier 18, out of which the casing can only be lowered against the action of the spring 19 by knee drive (indicated by an operating member 8! acting on the carrier 18) for the purpose of introducing or withdrawing the fabrics to :be seamed.
  • the fabric bender having an upper edge, stepped according to the needle thickness, is displaceable in its holder by a needle thickness upwards and by the said step sideways e. g. by means of a rotary eccentrical bolt, provided with a handle accessible from outside through an aperture of the fabric bender casing 11.
  • the looper 63 located at that moment behind the needle plane, starts 1 on its active motion during which it picks up the thread loop left behind during the return stroke of the blind stitch needle 60, conveying it to the stationary loop catcher 68 along a curve initially ascending.
  • the chamfer-on the projection protruding over the slot 61d of the small guide plate then takes charge of the secure guidage of the lower thread 100p portion below the noseshaped catcher 13 of the loopcatcher E8.
  • the work is to be interrupted and the piqued fabrics are to be removed, same need but be drawn out in the fabric feeding direction :1: after the fabric bender casing 11 will have been lowered by the ull mem- 8. her 8
  • a blind stitch and piqu device whether adapted for use as a self-contained machine or as a sewing machine attachment, which comprises, in combination with work feeding and bending means, a looper for forming a thread loop, a blind stitch needle, 2. presser part adapted to clamp the work and separating the work from the looper, said presser part having an opening for the work to be sewn and a groove for guiding the needle, a loop catching nose being provided in the edge of said opening for stripping the thread loop from the looper and laying it above and below the needle guiding groove.
  • a blind stitch and pique device comprising a looper for forming a thread loop, a blind stitch needle, a presser part rigidly connected to the machine head and separating :the work from the looper, said presser foot having an opening for the work to be sewn and a groove for guiding the needle and a loop catching nose provided at the edge of said opening for stripping the thread, loop from the looper and laying it above andbeloyv the needle guiding groove, said loop catching nose having a thread holding pin which protrudes beyond the upper edge of said noser 6.
  • blind stitch and pique device comprising a looper for forming a thread loop, a blind stitch needle, a presser part rigidly connected to the machine head and separating the work from the. looper,
  • said presser foot having an opening for the work to be sewn and a groove for guiding the needle and a loop catching nose provided at the edge of said opening for stripping the thread loop from the looper and laying it above and below the needle guiding groove, said loop catching nose having a thread holding pin which protrudes beyond the upper edge of said nose, the looper being pivotally movable about an axis which is inclined both against the Vertical plane of the needle path and against a vertical plane laid through the nadir point of the needle path in the work feeding direction, the pivotal axis of the looper intersecting with the needle path on 10 the stitching-in side of the work, the looper thus being adapted to lay the upper leg of the loop around the thread holding pin.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US12076A 1946-03-12 1948-02-28 Blind stitch sewing machine Expired - Lifetime US2618232A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT257696X 1946-03-12

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US2618232A true US2618232A (en) 1952-11-18

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Application Number Title Priority Date Filing Date
US12076A Expired - Lifetime US2618232A (en) 1946-03-12 1948-02-28 Blind stitch sewing machine

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US (1) US2618232A (en, 2012)
BE (1) BE482445A (en, 2012)
CH (1) CH257696A (en, 2012)
DE (1) DE873482C (en, 2012)
FR (1) FR963696A (en, 2012)
GB (1) GB665893A (en, 2012)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2687103A (en) * 1952-11-18 1954-08-24 Mosberg Abraham Blindstitch attachment for sewing machines
US2889793A (en) * 1952-07-25 1959-06-09 Union Special Machine Co Sewing machine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2945460A (en) * 1956-04-11 1960-07-19 Kagiyama Kosuke Sewing machine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2248439A (en) * 1934-02-02 1941-07-08 Wurker Blind stitching and pique machine
US2257363A (en) * 1938-04-01 1941-09-30 Hidstitch Company Blind stitch mechanism

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2248439A (en) * 1934-02-02 1941-07-08 Wurker Blind stitching and pique machine
US2257363A (en) * 1938-04-01 1941-09-30 Hidstitch Company Blind stitch mechanism

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2889793A (en) * 1952-07-25 1959-06-09 Union Special Machine Co Sewing machine
US2687103A (en) * 1952-11-18 1954-08-24 Mosberg Abraham Blindstitch attachment for sewing machines

Also Published As

Publication number Publication date
DE873482C (de) 1953-04-13
CH257696A (de) 1948-10-31
FR963696A (en, 2012) 1950-07-18
BE482445A (en, 2012)
GB665893A (en) 1952-01-30

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