US2029942A - Sewing machine - Google Patents

Sewing machine Download PDF

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US2029942A
US2029942A US643276A US64327632A US2029942A US 2029942 A US2029942 A US 2029942A US 643276 A US643276 A US 643276A US 64327632 A US64327632 A US 64327632A US 2029942 A US2029942 A US 2029942A
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Prior art keywords
needle
hook
throwing
reciprocating
throw
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US643276A
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Rapaport Naham
Armstrong Edward West
Hutchinson Oliver George
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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B3/00—Sewing apparatus or machines with mechanism for lateral movement of the needle or the work or both for making ornamental pattern seams, for sewing buttonholes, for reinforcing openings, or for fastening articles, e.g. buttons, by sewing
    • D05B3/02—Sewing apparatus or machines with mechanism for lateral movement of the needle or the work or both for making ornamental pattern seams, for sewing buttonholes, for reinforcing openings, or for fastening articles, e.g. buttons, by sewing with mechanisms for needle-bar movement

Definitions

  • This invention relates to sewing machines, for embroidery or other decorative sewing, of the kind having at least one needle, means for reciprocating the needle axially, means for shifting or throwing the needle to and fro laterally to a controllable or variable extent, a needle thread supply, an under thread supply, and a rotary hook which enters loops formed in the needle thread below the fabric and serves. to interengage said loops with the under thread, the needle reciprocating and throwing means and the hook being actuable in timed relationship.
  • Now th present invention makes it possible to attain not only certainty of engagement of the needle thread loops by the hook at the heretofore known limits of throw, but optionally a much 50 greater throw, up to about the diameter of the hook path, with the same certainty of operation.
  • the invention provides means for varying the height at which the needle reciprocates, in dependence on the lateral throw imparted to the 55 needle, in such manner as to ensure proper November 30, 1931 (Cl. 112i58) presentation of the needle thread loop to the hook in all lateral positions of the needle.
  • the means for raising and lowering the height of the needle as it is thrown laterally is or may be such that the time taken for the needle in 5 any line of reciprocation to pass and repass the eifective arc of the hook path is equal to the time taken by the hook to reach the said line.
  • the invention also provides means for effecting a lateral throw of the needle up to an 10 extent substantially equal to the diameter of the hook, and means for ensuring proper presentation of the needle thread loop to the hook in all lateral positions of the needle.
  • any of the means as aforesaid may be incor- 15 porated in a machine designed to comprise them, or any of the said means may constitute an attachment for the existing machines of the. kind set forth.
  • the invention provides means whereby the tension exerted by the said friction device on the needle thread is automatically decreased or increased inversely with increase or decrease in. the lateral shift or throw 35 of the needle, so that the said disadvantage arising from constant thread tension is avoided, and also increased throw of the needle may be employed without the quality of the work being im- 40 paired by excessive thread tension.
  • Fig. 1 is a fragmentary elevation of the machine
  • Fig. la. is a fragmentary elevation of certain of the existing details of the machine
  • Fig. 1b is a plan view of the said details
  • Fig. 2 is an end view of the novel means shown in Fig. 1;
  • Fig. 3 is a diagram illustrating a feature of the said means
  • Figs. 4 and 5 are diagrams illustrating the operation of the said means
  • Fig. 6 is an elevation of a constructional form of the hereinbefore mentioned means for automatically varying the thread tension
  • Fig. 7 is a sectional elevation on the line VIIVII of Fig. 6;
  • Fig. 8 is a perspective view of the whole machine head showing the correlation of various known parts thereof with the means according to the invention.
  • Fig. 9 is an elevation showing a modification or development of the invention for employing two needles simultaneously.
  • the machine head I is mounted over the work table 2, and encloses mechanism for operating from the shaft of the flywheel pulley 6 (Fig. 8) the needlebar 3, the cross-over crank 4 and the rotary hook 5.
  • the head also supports the double presser foot assembly I, the thread spool mounting 8, the means 9 serving for the initial lateral positioning of the needle, and the linkage system III, II,
  • the cross-over crank 4 is actuated by the cam
  • the link I! is in turn pivoted on the pin 20 carried by the crank 2
  • the said shaft 22 is turnably mounted in and bodily movable by the link 23, which is itself turnable by the lever 9 (Fig. 6).
  • the swing carrier is locked against swinging movement, for
  • an attachment comprising a plate 24 secured to the needle-bar 3 and having horizontal guides 25 serving to guide a second plate 26.
  • This second plate 26 has vertical guides 2! in which a block 28 constituting a holder for the needle 29 is movable.
  • This block or needle holder 28 has a pin 36 projecting from its back and passing through an aperture 3
  • An anti-friction roller may be provided on the pin to engage the walls of the cam slot. The lateral movement of the needle is now achieved by moving the second plate 26 along the slides 25.
  • the movements of the plate 26 are received, directly or indirectly, from the cross-over crank, the end of which is constrained to reciprocate in a horizontal, lateral line by guides 35, 36, 31 on the body of the machine, and a pin 38 mounted in: a lug on the said body.
  • a short connecting link 33 is pivoted to the cross-over crank at 34, and transmits the horizontal movement thereof, through a pivotal connection 39, to a multiplying lever 46.
  • This lever 46 is pivoted at 4
  • the sliding engagement of the block 43 and the rod 44 enables the plate 26 to be moved laterally through the link 33 and the lever 40 notwithstanding that the plate 26, and the rod 44 secured to it, reciprocate vertically with the needle-bar 3.
  • the short link 33 may be adjustable as to length. Further, to enable the length of throw of the needle to be initially adjusted, the point of connection of the link 33 and lever 40 may obviously be made adjustable along the length of the lever.
  • the function of the attachment may be understood by consideration of Fig. 3.
  • the hook 5 moves in a circular path (of which the effective are is that above the diameter XOX) below a slot in the work table 2, through which the needle passes at each stroke.
  • the stroke is of a constant length a, being determined by the stroke of the needle-bar 3; however, as may be seen from Fig. 3, the upper and lower limits of the stroke a are changed in accordance with every change of position of the pin 30 (which is secured to the needle block 28) in the cam slot 32.
  • the primary function is to bring the needle to such a position at every reciprocation that the loop formed in the upper thread below the base fabric extends across the path of the hook at the time when the hook passes the needle.
  • the common practice of having the needle past its bottom dead-centre and commencing to rise at the time of engagement of the loop by the hook is to be retained.
  • the locus of the lower dead-centres of the needle strokes with various throws might be considered as an arc of radius equal to that of the path of the hook, and vertically below the said path.
  • the time taken for the hook 5 to rotate through the angle corresponds to the time taken by the needle to rise from its lower dead-centre through the distance I), and the loop in the needle. thread is correctly positioned for engagement by the hook; similarly, the times occupied by the rotation of the hook and the rise of the needle are correlated for every position, and perfect engagement of the thread loops by the hook is attained up to the limits of the needle throw, notwithstanding that the length of the said throw may approximate to the diameter of the path of the hook and that at the one extreme the hook is rising practically vertically while at the other extreme the hook is descending practically vertically.
  • the cam slot 32 is shaped substantially as shown in Fig. 3 of the drawings, being not quite symmetrical about a vertical line, but having its left end lower than its right end.
  • the decrease in the lowering of the needle may not be exactly uniform from left to right when the invention is applied to such machines.
  • the shape of the slot 32 is but a slight modification of that shown in Fig. 3.
  • the throw of the needle is increased, it is desirable, and may be necessary, to set back, as by grinding or otherwise, the nose of the usual base member (not shown) about which the hook rotates, so that thread loops taken up by the hook, even at the extreme left-hand needle position, may subsequently be transferred to the said nose in the ordinary manner of sewing.
  • Figs. 4 and 5 show the attachment with the needle at lower dead-centre in its extreme right and left positions respectively.
  • the hook 5 is in its datum position as described with reference to Fig. 3, but it will be observed that 'in Fig. 4 by virtue of the dropping of the left end oi the cam slot 32 the needle block 28 and the needle 29 are lower than in Fig. 5, where the pin 36 is in the higher right end of the cam slot.
  • the known machines of the kind with which the invention is concerned sulfer a disadvantage arising from the fact that the thread tension remains unchanged despite variations in the throw of the needle.
  • the means as hereinbefore described permitting, if desired, an increase in the needle throw, it. is even more desirable to avoid any possibility, of the tension of the needle thread spoiling the effectiveness of the work of the machine.
  • the rod 41 in two parts slotted at 48 toreceive bolts 49. Also, the relative amounts of turning of the arm I la and the lever 46 are made adjustable by attaching the rod 41 to the arm Ila by means of a pivot 50 engaging a slot 5
  • the lever 46 is mounted on a pin 52 supported in the body I of the machine, and a toothed quadrant 53 is also mounted on the pin so as to be turnable with the lever 46.
  • the quadrant meshes with a toothed pinion 54, the hub of which is screw-threaded internally and engages a screw-thread formed on a pin 55 carrying a pair of conical thread-tension plates or washers 56 and compression control spring 5?.
  • a thread 58 passes from a spool or bobbin 59 on the mounting 8 through eyes 60 and 6
  • Fig. 8 shows the complete assembly of a machine, with. an attachment for raising and lowering the limits of the needle stroke in accordance with the lateral throwing of the needle block 28 on the plate 24; linkage 33, 40 for obtaining an increased throw of the needle block from the cross-over crank 4 without modifying the mechanism provided in the machine for reciprocating the said crank; and auxiliary arm I la actuating, through the linkage 46, 4'! and the quadrant 53, the pinion 54 which controls the tension of the needle thread.
  • a modification of the attachment as above described, illustrated in Fig. 9 of the drawings, is fitted with two needles, for sewing patterns in two colours simultaneously or for sewing divided patterns, such as split leaves, in one colour or two colours.
  • the attachment comprises the plate 24 attached to the needle-bar 3, and carrying a second plate having a slide 21 upon which the needle block 28 is vertically movable, the only 'diiierence being that the slide 2'! is constituted by a central under-cut rib which the block 28 is adapted slidably to embrace.
  • the plate 26 is movable horizontally in the slides 25 by the crossover crank 4, an extension 4b of which engages the vertical rod 44 by means of a block 43 slidable on the rod.
  • the needle block 28 carries above the needle 29, a pin 30 engaging the cam slot 32 in the plate 24.
  • the modified attachment carries a second needle block 28a, mounting a needle 29a and slidably supported on the guide 21a of a plate 25a horizontally movable in the slides 25.
  • the plate 26a has a lug 45a supporting a vertical rod 44a, which is slidably embraced by a block 43a pivoted to an additional cross-over crank 4a, whereby the plate 26a is moved in the slides 25.
  • the block 2801. also carries a pin 35a engaging the slot 32.
  • the blocks 28 and 2811 are adapted for the pins 39, 30a to be brought close together in the slot 32 when necessary, the needles 29, 29a also being then close together.
  • the operator moves the base fabric to pass the left-hand edge of the pattern under the extreme left position of the left-hand needle, and operates the knee-lift lever to control the length of the joint throw of the needles so that the throw brings the right-hand needle to the right-hand edge of the pattern. Sewing in this manner presents no difficulty, as the operator Watches only the total width sewn, the proportions of the respective widths sewn by the two needles being determined by means of suitable linkages of the nature shown in Figs. 1a and 1b, modified as may be required (which form no part of this invention)
  • the respective strokes of the two needles shown in Fig. 9 may be such as toproduce a variety of designs.
  • the left-hand needle may work that side of the leaf to the left of the vein in one colour
  • the right-hand needle works that side of the leaf to the right of the vein in the same or another colour
  • the movements being so arranged and controlled that, despite such changes of the respective throws as may be necessary to work the broader and narrower parts of the leaf, the central vein is not sewn over.
  • the strokes of the two needles may be made to overlap, since the controlling linkages may be such as to cause the needles to move to the left and to the right simultaneously. In this case, at the juncture of the parts sewn in the two colours there will be a mingling of the threads so that the colours will have an appearance of shading into one another. 7
  • a new machine incorporating means according to the invention may, of course, be constructed to realize any of the possibilities (a) (b) or (c) and in a new machine fixed bearings (not a swing carrier) may be provided for the needle-bar.
  • the needle moves vertically, i. e. in its own axis perpendicularly to the plane of the work, regardless of the position it occupies along its path of lateral throw.
  • Such a movement is to be preferred for various reasons, and the possibility of obtaining it by means of the said constructions is an advantage not present in existing machines with swing frame needle-bar carriers, in which the needle has a movement'perpendicular to the plane of the work only when it happens to be located at one particular point, such as the midpoint of its lateral throw. At all the other points of the said throw the needle is inclined, more or less, to the plane of the work.
  • the invention also confers several further advantages.
  • the obvious advantage of being able to execute large patterns (without the necessity for going over the work in a number of strips, or first executing a marginal strip and then seeding in the middle portion) itself results in a remarkable increase in the speed at which work may be executed.
  • the absolute certainty with which the hook takes up the needle thread loops even at the extremes of the lateral throw, prevents Waste of time in unpicking and repeating work on account of dropped stitches, and also waste of thread.
  • the consequent better balance and reduced friction of the moving parts further enables the machine to be operated at an absolute speed much greater than has hitherto been practicable, this speed being limited only by the skill of the operator.
  • the embroidery machines have been hereinbefore described as having only one hook co -operating with a single needle or a single group of needles. It will, however, be understood that the invention may be applied to machines for special purposes having a plurality of hooks co-operating with a like plurality of needles or groups of needles.
  • means comprising in combination a member vertically reciprocable between fixed limits, a rotary hook, a member supported by the said member and laterally movable parallel to the plane of the hook, a needle-holding member vertically movable on the laterally movable member, means imparting variable lateral movements to the laterally movable member, and a pin on the needle-holding member engaging a cam slot associated with the vertically reciprocable member, said pin and slot varying the height at which the needle reciprocates in dependence on the variable lateral movements imparted to the needle, and ensuring proper presentation of the needle thread loops to the hook in all lateral positions of the needle.
  • means comprising in combination a rotary hook, a needle bar vertically the height of reciprocation of the needle that the time taken for the needle in any line of reciprocation to rise from its lower dead centre to the effective arc of the hook path is equal to the time taken by the hook to reach the line of reciproca- -tion.
  • a rotary hook of a needle bar vertically reciprocable between fixed limits, lateral guide means supported by the needle bar, a member variably laterally slidable parallel to the plane of the hook on the said guide means, vertical guide means on the said member, a needle block slidable on the vertical guide means, a cam slotted member supported by the needle bar, a pin on the needle block engaging the cam slot, and means for effect- -ing lateral throwing of the needle up to an extent substantially equal to the diameter of the hook, said slot being shaped to ensure proper presentation of the needle thread loops to the hook in all lateral positions of the needle.
  • means comprising in combination a member vertically reciprocable between fixed limits, needle throwing means, a rotary hook aotuable in timed relationship with said member and said means, a laterally movable -member supported by the said member, a needleholding member vertically movable on the laterally movable member and a pin on the needleholding member engaging a cam slot associated with the vertically reciprocable member, a vertical extension on the laterally movable member,
  • a yoke member slidably embracing the extension, the said yoke member being operatively connected to the needle-throwing means and transmitting needle-throwing movements through the extension to the laterally movable member without hindering its vertical reciprocations, and the said cam slot being shaped to cause such change of the height of reciprocation of the needle as it is thrown laterally that the time taken for the needle in any line of reciprocation to rise from its lower dead centre to the effective are of the hook path is equal to the time taken by the hook to reach the line of reciprocation.
  • a knee-lift lever aotuable by the operator to control the extent of the needle throw, a take-up lever, a needle thread tensioning device adjacent said take-up lever, from which said thread passes to said lever, comprising a pair of friction members and spring means pressing said members together, an externally screw-threaded member supporting an internally screw-threaded member which abuts said spring means, and lever means operatively connected with said knee-lift lever for turning said internally threaded member and thereby moving it axially to vary the stress in said spring 19.
  • a sewing machine of the kind set forth the combination of a knee-lift lever aotuable by the operator to control the extent of the needle throw, a take-up lever, a needle thread tensioning device adjacent said take-up lever, from which said thread passes to said lever, comprising a pair of friction members and spring means pressing said members together, an externally screw-threaded member supporting an internally screw-threaded member which abuts said spring means, and lever means operatively connected with said
  • a thread tensioning device comprising a stud, a pair of conoidal washers supported on the stud, an externally screw-threaded portion on the stud, an internally screw-threaded pinion seated on said portion, a coil spring surrounding the stud and abutting the pinion and one of the washers, a fixed stop abutting the other of the washers, a toothed quadrant meshing with the,
  • cam means ensuring proper presentation of the needle thread loops to the hook in all lateral positions of the needles.
  • a needle bar vertically reciprocable between fixed limits, lateral guide means supported by the needle bar, a plurality of members laterally slidable on the said guide means, vertical guide means on each of said members, a needle block independently slidable on the vertical guide means on each of said members, a cam slotted member supported by the needle bar, a pin on each of the needle blocks engaging the cam slot, and means for effecting lateral throwing of the needles up to a total extent substantially equal to the diameter of the hook, said cam slot being shaped to ensure proper presentation of the needle thread loops to the hook in all lateral positions of the needles.
  • An attachment for a sewing machine having means for reciprocating the needle axially, means for throwing the needle to and fro laterally to a variable extent, and a rotary hook actuable in timed relationship with the needle reciprocating and throwing means, comprising means raising and lowering the height of reciprocation of the needle as it is variably thrown laterally in a plane transverse to the line of sewing, said means causing such change of the height of reciprocation that the time taken for the needle in any line of reciprocation to rise from its lower dead centre to the efiective arc of the hook path is equal to the time taken by the hook to reach the line of reciprocation.
  • An attachment for a sewing machine having means for reciprocating the needle axially, means for throwing the needle to and fro laterally to a variable extent, and a rotary hook actuable in timed relationship with the needle reciprocating and throwing means, comprising in combination a needle-holding member, a lever attachable by pivot means at its upper end to the mathrowing means imp-art through the lever a multiplied variable throw to the needle-holding member in a plane transverse to the line of sewing, and pin-and-slot means serving to connect the needle-reciprocating means with the needleholding member and to ensure proper presentation of the needle thread loop-s to the hook in all lateral positions of the needle.
  • An attachment for a sewing machine having needle-reciprocating means including a needle-bar movable vertically in fixed guides between fixed limits, means for throwing the needle to and fro laterally to a variable extent and a rotary hook actuable in timed relationship with the needle bar and the needle throwing means,
  • An attachment for a sewing machine having needle-reciprocating means constituted by a needle-bar movable vertically in fixed guides between fixed limits, means for throwing the needle to and fro laterally to a variable extent and a rotary hook actuable in timed relationship with the needle bar and the needle throwing means,
  • lateral guide means attachable to the needle-bar, a member variably laterally slidable on said guide means, vertical guide means on said member, a needle block slidable on the vertical guide means, the lateral guide means having a cam slot, and a pin on the needle block engaging the cam slot, said cam slot being shaped to cause such change of the height of reciprocation of the needle that the time taken for the needle in any line of reciprocation to rise from its lower dead centre to the effective arc of the hook path is equal to the time taken by the hook to reach the line of reciprocation.
  • An attachment for a sewing machine having means for reciprocating the needle axially, means for throwing the needle to and fro laterally to a variable extent, and a rotary hook actuable in timed relationship with the needle reciprocating and throwing means, comprising in combination a multiplying lever attachable by pivot means to the machine and to the needlethrowing means, lateral guide means attachable to the needle-reciprocating means, a member laterally slidable on said guide means, vertical guide means on said member, a needle block slidable on the vertical guide means, the lateral guide means having a cam slot, said carn slot being shaped to ensure proper presentation of the needle thread loops to the hook in all lateral positions of the needle, a pin on the needle block engaging said cam slot, a vertical extension on the laterally slidable member, a block member slidable on the said extension and attachable by pivot means to the lever, the said several pivot means being relatively located by the lever in such manner that needle-throwing movements are multiplied by the lever, said movements being transmiss
  • An attachment for a sewing machine having needle-reciprocating means including a needle bar vertically reciprocable between fixed limits, means for throwing the needle to and fro laterally to a variable extent, and a co-operating rotary hook
  • said attachment comprising in combination a plate attachable to the lower end of the needle bar transversely to the line of feed of the machine, horizontal slides on said plate, a member transversely movable in said slides, a rod extending vertically upwards from said member, a yoke slidable on said rod and pivotally attachable to the needle-throwing means, vertical slides on said member, a needle block vertically movable in said vertical slides, a pin projecting rearwardly from said needle block, a vertical slot in said member, and a cam slotin said plate, said pin projecting through said vertical slot and co-operating with said cam slot, which is shaped to impart to the needle block as said member and said needle block are moved laterally by the needle-throwing means through said rod and yoke such changes of height

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
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US643276A 1931-11-30 1932-11-18 Sewing machine Expired - Lifetime US2029942A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2635568A (en) * 1949-10-08 1953-04-21 Gellman Abraham Mechanism for design stitching
US2818827A (en) * 1953-04-07 1958-01-07 Morris A Zucker Machine attachment for embroidery stitcher
US3148646A (en) * 1961-12-22 1964-09-15 Man Sew Corp Zigzag sewing machines
US3162155A (en) * 1960-02-15 1964-12-22 Artis E Charles Universal multi-needle tufting machine
US3343509A (en) * 1963-12-27 1967-09-26 Chrysler Corp Zig zag sewing machine
US20140182498A1 (en) * 2011-08-08 2014-07-03 Ykk Corporation Sewn Product And Method For Sewing Material

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2635568A (en) * 1949-10-08 1953-04-21 Gellman Abraham Mechanism for design stitching
US2818827A (en) * 1953-04-07 1958-01-07 Morris A Zucker Machine attachment for embroidery stitcher
US3162155A (en) * 1960-02-15 1964-12-22 Artis E Charles Universal multi-needle tufting machine
US3148646A (en) * 1961-12-22 1964-09-15 Man Sew Corp Zigzag sewing machines
US3343509A (en) * 1963-12-27 1967-09-26 Chrysler Corp Zig zag sewing machine
US20140182498A1 (en) * 2011-08-08 2014-07-03 Ykk Corporation Sewn Product And Method For Sewing Material
US9334594B2 (en) * 2011-08-08 2016-05-10 Gotalio Co., Ltd. Sewn product and sewing method of material

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DE603989C (de) 1934-10-13
BE392667A (en))
FR746503A (fr) 1933-05-30

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