US3065717A - Sewing machines - Google Patents

Sewing machines Download PDF

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US3065717A
US3065717A US713896A US71389658A US3065717A US 3065717 A US3065717 A US 3065717A US 713896 A US713896 A US 713896A US 71389658 A US71389658 A US 71389658A US 3065717 A US3065717 A US 3065717A
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Prior art keywords
needle
needles
feed
looper
work
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US713896A
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George M Reimer
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Union Special Machine Co
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Union Special Machine Co
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Priority to US713896A priority Critical patent/US3065717A/en
Priority to FR783711A priority patent/FR1222603A/fr
Priority to GB4042/59A priority patent/GB852616A/en
Priority to DEU2430U priority patent/DE1908053U/de
Application granted granted Critical
Publication of US3065717A publication Critical patent/US3065717A/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
    • D05B1/08—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
    • D05B1/10—Double chain-stitch seams
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B57/00—Loop takers, e.g. loopers
    • D05B57/02—Loop takers, e.g. loopers for chain-stitch sewing machines, e.g. oscillating
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B73/00—Casings
    • D05B73/04—Lower casings
    • D05B73/12—Slides; Needle plates

Definitions

  • This invention relates to a sewing machine adapted for the high speed formation of a strong seam in garments and the like subject to hard usage. It is particularly useful in the seaming of work in which relatively heavy or stiff materials are to be united with a strong, closely stitched seam. Typical uses of the machine are in the sewing of bags, in-seaming and out-seaming on trousers, overalls, uniforms, dresses and the like and in waistband operations and other operations requiring multiple lines of stitching.
  • Machines of the foregoing type adapted to produce a strong seam of the 401 type of the Federal Specifications, or one of equal strength, are capable of operation only at speeds of between 4000 and 45000 rpm. This is particularly true in connection with machines equipped with intermittently driven puller rollers as required for the proper feeding of certain types of work.
  • the one-Way clutch mechanisms employed in such machines have a maximum speed limitation of the charatcer mentioned. Therefore, in the use of machines of the type indicated, as heretofore constructed, a definite limitation is imposed upon their output in the production of the normally required, relatively short stitch length.
  • two needles arranged for reciprocation by a needle bar are disposed one directly behind the other in the direction of seam formation, the needles having their points or their axes spaced apart a distance equal to one-half the extent of feed of the work upon each cycle of operation of the machine.
  • Cooperating with both needles is a single, two-motion looper arranged for swinging movement in the direction of feed and adapted to seize the loops of needle thread from both needles as the looper swings forwardly, in the direction opposite to that in which the Work is fed.
  • a spreader having a two-motion movement across the line of feed is arranged to engage the loop of thread carried by the looper and carry this laterally a suitable distance to form a triangle between this leg of the looper thread loop, the adjacent face of the looper blade, and preceding loops of needle thread which are in the course of being pulled up to the work.
  • the triangle so formed is of adequate size to enable the downward passage of both needles therethrough.
  • looper and spreader there is produced a modified form of 402 type stitch. It will have substantially the same appearance as a regular two-thread chain stitch produced with a stitch length only half that of the actual feed stroke of the machine constructed and operated in accordance with the present invention.
  • a machine operating at 4000 rpm. with a feed stroke of .200 will produce what appears to be a single seam equivalent to that provided by a machine having a single needle and a single looper operating at 8000 r.p.m. with a feed stroke of .100.
  • the invention also contemplates the simultaneous production of a plurality of laterally spaced lines of stitching of the character discussed above.
  • two or more such lines of stitching may be formed simultaneously at a rapid rate for various purposes as in the attachment of waistbands to garments.
  • one or more of the laterally spaced lines of stitching may be produced with only one needle so that such line or lines of stitching will be of the 401 type with a stitch length equal to the feed stroke.
  • lines of 401 stitches may be produced simul taneously in any combination with the modified 402 lines of stitches.
  • Machines constructed in accordance with the invention may also be provided with auxiliary work feeding means, such as a puller roller, to insure the proper ad- Vance of multiple layers of work to be stitched together.
  • auxiliary work feeding means such as a puller roller
  • the multiple needles, arranged in the manner indicated may advantageously be advanced in the direction of feed while engaged with the work to impart a needle feed action thereto. This insures proper advance of the Work at the rapid rate contemplated and does not interfere with the proper cooperation of the needles with the looper in the formation of the desired stitches.
  • Such needle feed action may be provided in machines adapted to produce a plurality of lines of stitching of the character indicated in spaced, parallel relation.
  • the needle bar in such cases will be provided with a needle clamp adapted to retain a pair of needles in the proper relation for each line of stitching to be formed, and a looper will be provided for cooperation with each of such pairs of needles.
  • FIG. 1 is a view largely in front elevation but partly in vertical section of a machine embodying the invention
  • FIG. 2 is a view largely in end elevation, as seen from the left in FIG. 1, with a cover plate removed and a portion of the base shown in section;
  • FIG. 3 is an end elevational view of the machine as seen from the right in FIG. 1;
  • FIG. 4 is a plan view of the work supporting base of the machine, with the cloth plate removed, and includes a horizontal section through the vertical standard of the frame;
  • FIG. 5 is a transverse vertical section through the work supporting base of the machine showing the work feeding and looper mechanisms and certain related parts;
  • FIG. 6 is a plan view of the looper and spreader mechanism of the machine
  • FIG. 7 is a detail view in vertical section taken along the line 7-7 of FIG. 4;
  • FIG. 8 is a plan view of throat plate, showing the feed dog cooperating therewith, for use in a machine adapted to have four pairs of needles;
  • PEG. 9 is a vertical sectional view illustrating the relation between the needles, looper and spreader at a point in the cycle of the machine;
  • FIG. 10 is a similar view at a later point in the cycle of the machine.
  • FIG. 11 is a perspective view of the parts at substantially the point in their cycle illustrated in FIG. 10;
  • FIGS. 12 and 13 are plan views of the looper and spreader at the points in a cycle illustrated in FIGS. 9 and 10, respectively;
  • FIG. 14 is a view similar to FIGS. 9 and 10 but at a later point in the cycle of operation of the machine;
  • FIG. 15 is a plan view of the looper and spreader at the same point in the cycle as in FIG. 14;
  • FIG. 16 is a schematic view of the form of a line of stitching produced in accordance with the invention.
  • FIGS. 17 and 18 are views similar to FIG. 9 but at later stages in a cycle of operation
  • FIGS. 19 and 20 are plan views of the looper and spreader corresponding, respectively, with the positions assumed in FIGS. 17 and 18;
  • FIG. 21 is a view similar to FIG. 2 showing a modified construction in which a needle feed action is embodied in the machine;
  • FIG. 22 is a longitudinal vertical section through the left hand portion of the work supporting base and a corresponding portion of the overhanging arm and needle head of the modified machine;
  • FIG. 23 is a side elevational view of a looper with a needle guard and a needle deflector assembled therewith;
  • FIG. 24 is a front elevational view of the parts shown in FIG. 23.
  • FIG. 25 is a plan view of the parts shown in FIG. 23.
  • the machine has a frame comprising a work supporting base 10, a vertical standard 11 and an overhanging arm 12 terminating in a needle head 13.
  • a main rotary drive shaft 14 Extending longitudinally of the work supporting base is a main rotary drive shaft 14 which projects outwardly at the right end of the base (FIG. 1) and has secured thereto a combined handwheel and pulley 15 through which power may be supplied to the machine from an electric transmitter or the like.
  • the shaft 14 Within the portion of the base beneath the vertical standard the shaft 14 has a crank 16 provided with an eccentrically located spherical formation cooperating with a strap at the lower end or" a pitman 17. At its upper end this pitman carries a strap cooperating with a ball pin projecting outwardly from a needle lever 18.
  • the illustrative machine is provided with four such needles two of which are indicated at 2311 and 230 in FIG. 1. Another needle 23b is shown in FIG. 2 this being directly in rear of needle 23a along the line of feed. A similar needle is provided directly in rear of needle 230 in the direction of feed.
  • the needle bar Upon each revolution of the drive shaft 14 the needle bar will be reciprocated to carry the thread carrying pointed ends of the needles from a position above the work support to a position beneath the latter. They are passed through suitable openings 24a in a throat plate 24, which may be of the character shown in FIG. 8, into cooperation with loopers to be described.
  • the elongated openings 2411 are each adapted to receive a pair of needles one behind the other in the direction of feed. In the embodiment of the invention under discussion only two of these openings are being utilized.
  • the forward needles 23a and 230 have their pointed ends at a somewhat lower elevation than those of the needles behind them so that they approach the loopers slightly earlier than the rearward needles.
  • the spacing of the needles of each pair is one-half of the distance through which the work is advanced upon each revolution of the drive shaft 14, by the means to be described.
  • the needles will have their axes spaced apart .10 inch. Therefore, the pair of aligned needles will pass needle threads through the work at points directly aligned in the direction of feed at intervals of .10 inch throughout the length of a seam.
  • the feed travel may be varied to suit the requirements of the work to be performed and the spacing of each pair of needles will be varied accordingly to equal one-half the feed travel.
  • Different clamps 22 may be provided for attachment to the needle bar in order to obtain the desired needle spacing.
  • the machine will provide a seam which is comparable to a 40 1 line of stitching having ten stitches to the inch with a feed stroke of of an inch. If the feed stroke is changed to of an inch the needle spacing will be of an inch and the seam produced will be comparable to a 40 1 line of stitching having 14 stitches per inch.
  • a four-motion feed mechanism For advancing the work in relation to the stitch form ing devices and in the region therof, there is provided a four-motion feed mechanism best shown in FIGS. 2, 3 and 5. It comprises a feed dog 25, preferably having a plurality of segments as shown in FIG. 8, and having a shank mounted on an arcuately formed feed bar 26. At its rearward end the feed bar is pivotally mounted by means of a shaft 27 on the upper end of a feed rocker 28 secured at its lower end to a shaft 29 suitably journalled in bearings carried by the work supporting base of the frame. Rocking movements are imparted to the feed rocker 28 by means of an adjustable eccentric or crank element 30 provided adjacent the left end (FIG. 1) of the shaft 14.
  • Adjustment of the eccentricity of the crank element 30 serves to vary the feed stroke.
  • a pitman 31 cooperating with the crank element has its lower end pivotally connected with an arm 32 the opposite end of which is clamped upon a trunnion 33 extending laterally from the feed rocker 28. It will be apparent that as a result of this connection the feed rocker will be swung back and forth about the axis of the shaft 29 to an extent dependent upon the adjustment or eccentricity of the crank element 3%).
  • the effective feed stroke imparted to the feed dog would be of an inch.
  • Lifting and lowering movements are imparted to the feed dog through a downwardly and forwardly extending arm 34 of the feed bar 26.
  • a pin 35 fixedly mounted in the forward end of the arm 34 is pivotally connected with a pitman 36 having a strap surrounding an eccentric 37 secured to the drive shaft 14.
  • the feed dog is mounted for slight vertical adjustment on the outer end of a horizontally extending arm of a bell crank 38 pivotally connected with the forward end of the feed bar 26.
  • a screw 25a serves to retain the feed dog at the desired elevation within the forward end of the arm indicated.
  • a downwardly extending arm of the bell crank 38 cooperates with a screw 39 the head of which limits the extent of counterclockwise movement of the bell crank (FIG. 5). Clockwise movement of the bell crank is limited by a screw 39a.
  • the angular position of the bell crank 38 may be varied as desired. This enables the most effective cooperation of the feed dog with the work to advance the same properly and the elevation of the feed dog in the bell crank 38 and the eccentricity of the crank element 30 serve to determine the effective feed stroke of the feed dog.
  • a presser foot 44 (FIG. 2) which serves to hold the work against the throad plate when the feed dog is lowered or retracted and against the feed dog when the latter is elevated.
  • This presser foot may be of conventional construction and is preferably pivotally mounted upon a shank element secured to a presser bar 40a which is urged downwardly by a spring 40b. Said spring reacts at its upper end against the bottom of an adjustable sleeve which may be turned by knurled head 460 to vary the force of the spring. At its lower end the spring acts against a block 40d secured to the presser bar. Provisions of the usual type, including a lever 402, are made for lifting the presser bar to carry the presser foot away from the throat plate, under control of a treadle or knee press, to facilitate introduction and removal of work.
  • the stitch forming devices include a looper 41a (FIG. 5) cooperating with the needles 23a and 23b. If two lines of stitching are to be formed, another looper 41b (FIG. 6) cooperates with the needle 23c and another needle directly in rear of the latter at half the feed stroke distance.
  • Each of the loopers is carried by a clamping member 42 which is adjustably secured by a bolt 43 in the desired location along an elongated opening or slot through a looper carrier 44- for cooperation with its pair of needles.
  • Bolt 43 cooperates with the elongated slot or opening through the looper carrier 44 mounted on a shaft 45 parallel with the main drive shaft 14. It will be understood that as many loopers are provided as pairs of needles arranged to form separate lines of stitching.
  • Shaft 45 is arranged to be rocked by an eccentric 46 on the shaft 14 (FIG. 4) cooperating with a strap 47 at the upper end of a pitman. The lower end of this pitman is pivotally connected with an arm 48 secured to the shaft 45. Adjacent the looper carrier 44 there is secured to the shaft 45 an arm 49 (FIG. 6). Looper carrier 44 is capable of swingnig about the shaft 45 but when the machine is in its operative condition the looper carrier is constrained to rock with the shaft 45 through the arm 4?.
  • a pin 50 is slidably mounted in forwardly extending arms 44a and 44b of the carrier 44 and is urged by a spring 51 toward the right (FIG.
  • the forked end of arm 52 cooperating with an annular groove in the head of pin 50 serves to draw the latter toward the left to disengage the end 50a of pin 50 from the opening in arm49.
  • the arm 52 has a projection 52a cooperating with a notch 55a in a plate 55 adjustably secured to the front face of the base of the machine by screws 55b (FIG. 1). It is only when the loopers 41a, etc. are rocked forwardly into their extreme loopseizing position, as shown in FIG. 5, that the projection 52a is lifted above the hook 55c at the left end of plate 55 which would normally prevent the shifting of the shaft 53 any substantial distance toward the left. This occurs only when the needles are retracted to a position above the work.
  • a plurality of spreader elements 56 Cooperating with the loopers and needles in the formation of the desired stitches are a plurality of spreader elements 56, one for each looper and a pair of cooperating needles. These spreader elements are secured in appropriate posiitons along a slide rod 57 by means of set screws 58 and project laterally from said rod. At an appropriate time in the cycle of operation of the machine the rod 57 is shifted toward the right (FIG.
  • Such movement of the rod 57 is produced by a spherical eccentric 59 (FIG. 7), secured to the shaft 14, cooperating with a spherical seat at the upper end of a pitman 60. The lower end of this pitman cooperates with a ball pin 61 extending outwardly from the outer end of an arm 62 secured to a rock shaft 63. Adjacent the forward end of the rock shaft 63 there is secured thereto an arm 64 (FIG. 1) which is connected by a link 65 with a clamp 66 secured to the rod 57. It will be apparent that upon each revolution of the drive shaft 14 the rod 57 will thus be shifted toward the right to perform the loop opening action mentioned, and it will later in the cycle be restored to its inactive position in preparation for the next loop opening action.
  • FIGS. 920 inclusive there is illustrated the mode of cooperation of the needles, looper and spreader in the formation of the desired line of stitching of the character shown in EEG. 16.
  • the looper 41a is shown in its extreme right-hand position, actually toward the front of the machine, which it assumes after having seized the loops of needle thread 67 and 63 from their respective needles 23a and 23b. The latter, subsequent to the seizure of their thread loops, have been elevated to a position above the work support and are ready to descend.
  • the spreader 56a is shifted in the manner explained to engage the loop of looper thread 69 and carry this slightly away from the blade of the looper, thus opening up a triangle or the like for the entry of the needles 23a and 2312 with their threads.
  • the triangle thus opened up is formed between the previous needle thread loops still held by the looper, the branch of the looper thread and the face of the looper blade 41a.
  • FIG. 11 the parts are shown in perspective at substantially the same point in a cycle as is illustrated in FIG. 10.
  • the looper 41a is retracted to shed the previous loops of needle thread, as shown in FIG. 14, so that these loops may be drawn up to the underside of the work along with the looper thread loop.
  • the needles are raised again to open up new loops of needle thread and the looper 41a is shifted toward the right to seize these new loops.
  • the relationship of the various elements at the time the new loops are first seized is shown in FIG. 18.
  • the needles, looper and spreader will assume the various relationships described above with respect to FIGURES 9 to 15 and the first set of needle thread loops, together with the first looper thread loop, will be drawn up against the underside of the work while the new set of needle thread loops will be temporarily held by the looper and the thread of the latter will again be opened out in the manner shown in FIG. 10 for re-entry by the needles.
  • auxiliary work feediug means is preferably employed.
  • This may be in the nature of a puller mechanism or it may be in the form of a needle feed action imparted to the needles.
  • a puller mechanism may comprise an idler roller '70 suitably mounted in the work supporting base of the frame and arranged to revolve with or about a shaft 70a (FIG. 2). As shown, the idler roller fits into the concavity of the feed bar 26.
  • roller 70 Cooperating with the roller 70 is a toothed or serrated feed roller 71 carried by a shaft 72 journaled in forked downward extensions 73 (FIGS. 1 and 2) of a bar 74 (FIG. 2) arranged for up and down movement in suitable bearing sleeves carried by rearwardly extending lugs on the needle head 13.
  • a spring 75 coacting at its lower end with a collar 76 secured to the rod 74 and at its upper end with the bottom of an adjustable sleeve having a knurled head 77, serves to urge the feed roller 71 downwardly against the work to grip the latter in cooperation with the roller 70.
  • the force with which the spring 75 urges roller 71 downwardly may be varied by turning the knurled head 77 and thus varying the elevation of the lower end of its connected sleeve.
  • Roller 71 may be lifted under manual control to facilitate the introduction and removal of work.
  • Feed movements are imparted to the roller 71 by means best shown in FIGS. 1 and 2.
  • Such means comprise a spiral gear 31 secured to the shaft 72 which carries the roller 71.
  • Meshing with the spiral gear 81 is a spiral pinion 82 secured to the lower end of a shaft 83 carried by a member 830. which partakes of the up and down movements of the roller 71.
  • Shaft 83 is connected by an extensible coupling 84 with a shaft 85 extending downwardly from a one-way clutch unit 86.
  • This may be of any well known construction and may have an arm 87 (P16. 3) arranged to be oscillated back and forth about the axis of unit 86 and to impart turning movements to a driven element of the clutch which is secured to the shaft 85.
  • Arm 87 has a ball pin which is received within a spherical strap of a short link 88 the opposite end of which has a spherical strap cooperating with a ball pin projecting laterally from an arm 89 (FIG. 3).
  • the latter is secured to a rock shaft 90 which, adjacent its opposite end, near the top of the vertical standard, carries an arm 91 having an elongated slot or opening therein. Within this slot is adjustably secured a bolt 91a carrying a ball pin cooperating with a strap at the upper end of a pitman 92, the lower end of which has a strap cooperating with a spherical eccentric 93 carried by the main drive shaft 14.
  • the arrangement is such that upon each revolution of the shaft 14 the arm 87 will be shifted back and forth to an extent determined by the location of the bolt 91a along the slot or opening in the arm 91. Corresponding movements will be imparted to the feed roller 71 in one direction, i.e., clockwise in FIG. 2.
  • FIGS. 21 and 22 there is shown a modified construction in which the desired rapid and proper advance of the work in relation to the stitch forming devices is insured by a needle feed action provided in substantially the same manner as disclosed in the patent to Peterson et al. No. 2,577,430, granted December 4, 195l.
  • the needle bar designated 21a in lieu of being supported for reciprocation in fixed bearing sleeves carried by the needle head, is mounted for reciprocation in a rock frame 94 pivotally mounted on the needle head by means of a screw stud 95. Adjacent its lower end the frame 94 has pivotally connected therewith a link 96 the opposite end of which is pivotally connected with an arm 97 secured to a rock shaft 98.
  • the latter corresponds with the shaft 90 of the first embodiment and is rocked by similar connections from the main drive shaft 14. It is somewhat longer than the shaft 90, however, and extends into a rearwardly projecting portion 13b of the needle head 13a.
  • the bolt or ball pin 91a (FIG. 3) along the slot or opening in the arm 91, the movement imparted to the rock frame 94 in the direction of feed of the work may be so regulated that the needles when engaged with the work will move in the feed direction at the same rate as the feed dog, thus imparting a needle feed action at the appropriate rate.
  • the needle bar 21a is reciprocated in the frame 94 by connections similar to those employed in the first embodiment.
  • FIG. 21 It includes a needle lever 18a pivotally mounted on a transverse shaft 19a in the overhanging arm and arranged to be rocked by connections of the type shown in FIG. 1 from the main shaft 14.
  • the end of the lever 18a carries a ball pin cooperating with a spherical strap in a link 20a the lower end of which cooperates with a ball pin carried by a block secured to the needle bar 21a.
  • a plate a (FIG. 21) secured to the needle head cooperates with the lower end of the frame 94 to guide it in its swinging movements.
  • FIGS. 23, 24 and 25 there is shown a looper assembly which may advantageously be employed in connection with either of the above-described embodiments of the invention.
  • This comprises a looper holder 99 arranged to be secured in the manner described to the rock frame 44 in properly adjusted position.
  • a looper 100 having a stem or shank 101 fitting into a vertical opening through a portion of the holder 99 is retained in desired position with the looper blade extending in the direction of feed by means of a set screw 102.
  • a needle guard 103 is mounted on the top of the holder 99. It has an opening arranged to receive the stem 101 of the looper about which the needle guard may be angularly adjusted to a slight extent.
  • a screw 104 passing through a slightly enlarged opening in the needle guard.
  • a needle deflector 105 is formed integrally with the holder 99.
  • the relationship between the looper 100, needle guard 103 and needle deflector 105 is shown in the three views mentioned. It is such as to insure maintenance of the proper relationship between the needles and the looper in the course of stitch formation.
  • a machine constructed in accordance with the invention may be adapted to form either a single line of stitching of the character shown in FIG. 16, or 2, 3, 4 or more such lines of stitching.
  • a pair of needles one directly behind the other, in the line of feed with a spacing between the needles of one-half of the extent of feed imparted to the work during each cycle of the machine.
  • a sewing machine having a frame comprising a work supporting base and an overhanging arm terminating in a needle head, a power receiving rotary drive shaft, work feeding means in said base arranged to advance work to be stitched a predetermined feed distance upon each revolution of said shaft, and a needle bar mounted for reciprocatory movement in said needle head
  • means for producing a two-needlethread chainstitch which comprises a pair of thread-carrying needles carried by said needle bar for reciprocation therewith, one needle being disposed directly behind the other in the direction of feed, said needles having their longitudinal axes spaced apart to the extent of one-half said feed distance
  • a thread-carrying looper mounted for only a two-motion swinging movement in a vertical plane parallel with the direction of feed and arranged to seize loops of thread from both of said needles on the same side thereof
  • a spreader mounted for movement in a direction perpendicular to said plane and arranged to engage and open out a loop of thread carried by said looper for passage
  • said needle bar being mounted in a frame carried by said needle head and arranged to swing in the direction of advance of the work, and connections from said shaft for swinging said frame in the direction of feed while said needles are engaged with the work to impart a feeding movement to the work substantially the same as that imparted by said work feeding means.
  • said looper having a forwardly extending blade which seizes the loops of needle thread as the looper is swung in a direction opposite to the direction of advance of the work.
  • a sewing machine having a frame comprising a Work supporting base and an overhanging arm terminating in a needle head, a power receiving rotary drive shaft, work feeding means in said base arranged to advance work to be stitched a predetermined feed distance upon each revolution of said shaft, and a needle bar mounted for reciprocatory movement in said needle head
  • the combination of means for producing a plurality of lines of two-needle-thread chainstitches which comprises a plurality of laterally spaced pairs of thread-carrying needles carried by said needle bar for reciprocation therewith, one needle of each pair being disposed directly behind the other needle of the pair in the direction of feed, said needles of each pair having their longitudinal axes spaced apart to the extent of one-half of said feed distance, a plurality of thread-carrying loopers mounted for only a two-motion swinging movement in vertical planes parallel with the direction of feed, each of said loopers being arranged to seize loops of thread from the same side of both needles of a related one of said pairs of
  • said needle bar being mounted in a frame carried by said needle head, means in said head for retaining said frame for swinging movement in the direction of advance of the work, and connections from said shaft for swinging said frame in the direction of feed while said needles are engaged with the work to impart a feeding movement to the work substantially the same as that imparted by said work feeding means.
  • said loopers having forwardly extending blades each of which seizes the loops of needle thread from its related needles as the looper is swung in a direction opposite to the direction of advance of the work.
  • a sewing machine having a frame comprising a work supporting base and an overhanging arm terminating in a needle head, a power receiving rotary drive shaft, work feeding means in said base arranged to advance work to be stitched a predetermined feed distance upon each revolution of said shaft, and a needle bar mounted for reciprocatory movement in said needle head
  • means for producing a two-needlethread chainstitch which comprises a pair of thread-car rying needles carried by said needle bar for reciprocation therewith, one needle being disposed directly behind the other in the direction of feed, said needles having their longitudinal axes spaced apart to the extent of one-half said feed distance, a thread-carrying looper mounted for only a two-motion swinging movement in a vertical plane parallel with the direction of feed and arranged to seize loops of thread from both of said needles on the same side thereof, a spreader mounted for movement in a direction perpendicular to said plane and arranged to engage and open out a loop of thread carried by said looper,
  • a sewing machine having a frame comprising a work supporting base and an overhanging arm terminating in a needle head, a power receiving rotary drive shaft, Work feeding means in said base arranged to advance work to be stitched a predetermined feed distance upon each revolution of said shaft, and a needle bar mounted for reciprocatory movement in said needle head
  • means for producing a two-needle-thread chainstitch which comprises a pair of thread-carrying needles carried by said needle bar for reciprocation therewith, one needle being disposed directly behind the other in the direction of feed, said needles having their longitudinal axes spaced apart to the extent of one-half said feed distance
  • a thread-carrying looper mounted for only a two-motion swinging movement in a vertical plane in the direction of feed and arranged to seize loops of thread from both of said needles on the same side thereof, said needles being then carried to a position above the Work, means for then opening out a loop of the thread carried by said looper to form a triangle defined by

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US713896A 1958-02-07 1958-02-07 Sewing machines Expired - Lifetime US3065717A (en)

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Application Number Priority Date Filing Date Title
US713896A US3065717A (en) 1958-02-07 1958-02-07 Sewing machines
FR783711A FR1222603A (fr) 1958-02-07 1959-01-09 Machines à coudre
GB4042/59A GB852616A (en) 1958-02-07 1959-02-05 Improvements in and relating to sewing machines
DEU2430U DE1908053U (de) 1958-02-07 1959-02-06 Kettenstich-naehmaschine.

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GB (1) GB852616A (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
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US3120203A (en) * 1959-09-10 1964-02-04 Fendt & Co Xaver Circular linking machine
US3443534A (en) * 1965-03-19 1969-05-13 Singer Cobble Ltd Tufting machines
US3867891A (en) * 1972-12-26 1975-02-25 Oehler Ag Multi-needle double chain-stitch quilting machine
US4480562A (en) * 1982-01-16 1984-11-06 Union Special G.M.B.H. Sewing machine loop spreading mechanism
US4606288A (en) * 1984-10-27 1986-08-19 Union Special G.M.B.H. Sewing machine needle guiding and aligning device
US4799439A (en) * 1981-07-14 1989-01-24 Maruzen Sewing Machine Co., Ltd. Double purpose looper for overlocking sewing machine
US4799440A (en) * 1981-08-11 1989-01-24 Maruzen Sewing Machine Co., Ltd. Looper changeover device
EP0737770A2 (fr) * 1995-04-12 1996-10-16 Pegasus Sewing Machine Mfg. Co., Ltd. Procédé et dispositif de contrÔle du fil du boucleur pour une machine à coudre à points de chaînette double
WO2001053591A1 (fr) * 2000-01-17 2001-07-26 Schmale-Holding Gmbh. & Co. Procede et dispositif pour realiser a la machine une couture a point de chainette double

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CH700150A1 (fr) * 2008-12-24 2010-06-30 Codefine Sa Procédé de fabrication de sacs pour le transport et l'entreposage de marchandises en vrac et sac obtenu selon le procédé.

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3120203A (en) * 1959-09-10 1964-02-04 Fendt & Co Xaver Circular linking machine
US3443534A (en) * 1965-03-19 1969-05-13 Singer Cobble Ltd Tufting machines
US3867891A (en) * 1972-12-26 1975-02-25 Oehler Ag Multi-needle double chain-stitch quilting machine
US4799439A (en) * 1981-07-14 1989-01-24 Maruzen Sewing Machine Co., Ltd. Double purpose looper for overlocking sewing machine
US4799440A (en) * 1981-08-11 1989-01-24 Maruzen Sewing Machine Co., Ltd. Looper changeover device
US4480562A (en) * 1982-01-16 1984-11-06 Union Special G.M.B.H. Sewing machine loop spreading mechanism
US4606288A (en) * 1984-10-27 1986-08-19 Union Special G.M.B.H. Sewing machine needle guiding and aligning device
EP0737770A2 (fr) * 1995-04-12 1996-10-16 Pegasus Sewing Machine Mfg. Co., Ltd. Procédé et dispositif de contrÔle du fil du boucleur pour une machine à coudre à points de chaînette double
EP0737770A3 (fr) * 1995-04-12 1997-06-11 Pegasus Sewing Machine Mfg Co Procédé et dispositif de contrÔle du fil du boucleur pour une machine à coudre à points de chaînette double
WO2001053591A1 (fr) * 2000-01-17 2001-07-26 Schmale-Holding Gmbh. & Co. Procede et dispositif pour realiser a la machine une couture a point de chainette double
AU771029B2 (en) * 2000-01-17 2004-03-11 Schmale-Holding Gmbh & Co Method and device for mechanically sewing a double chain stitch seam
CN100334284C (zh) * 2000-01-17 2007-08-29 施马尔控股股份有限公司 机器缝纫双线链式线迹的线缝的方法和装置
CZ301876B6 (cs) * 2000-01-17 2010-07-14 Schmale-Holding Gmbh & Co. Zpusob a zarízení pro strojové šití švu s dvounitnými retízkovými stehy

Also Published As

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DE1908053U (de) 1965-01-07
GB852616A (en) 1960-10-26
FR1222603A (fr) 1960-06-10

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