US1929322A - Chain stitch sewing machine - Google Patents

Chain stitch sewing machine Download PDF

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Publication number
US1929322A
US1929322A US558585A US55858531A US1929322A US 1929322 A US1929322 A US 1929322A US 558585 A US558585 A US 558585A US 55858531 A US55858531 A US 55858531A US 1929322 A US1929322 A US 1929322A
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United States
Prior art keywords
needle
looper
bar
thread loop
stroke
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US558585A
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English (en)
Inventor
Lutz Friedrich
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Union Special GmbH
Original Assignee
Union Special GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Union Special GmbH filed Critical Union Special GmbH
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Publication of US1929322A publication Critical patent/US1929322A/en
Anticipated expiration legal-status Critical
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Classifications

    • 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
    • D05B1/02—General types of sewing apparatus or machines without mechanism for lateral movement of the needle or the work or both for making single-thread seams
    • D05B1/06—Single 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

  • the invention relates to new and useful improvments in single thread chain stitch sewing machines.
  • a single chain stitch sewing machine which is especially adapted for the closing of holes in fabrics, by forming a line of enchained thread loops which is attached to the fabric and which covers and closes the opening.
  • the looper is a non-thread carrying looper, and is given a rotation while in the needle thread loop for the purpose of placing the needle thread loop on the needle.
  • the present application is an improvement on the machine in this copending application.
  • An object of the present invention is to provide a more efficient means for rotating the looper and also means associated with the looper for guiding and directing the needle.
  • a further object of the invention is to provide a more eiiicient means for reciprocating the needle and giving a dwell thereto during the time when the looper is being reversely rotated for the placing of the needle thread loop on the looper about the needle.
  • a still further object of the invention is to provide an improved 'means for raising the presser foot whereby the tension of the spring normally urging the presser foot on to the material is decreased by the upward movement of the needle bar so that the fabric may be more easily fed by hand in any desired direction.
  • Fig. 2 is a view partly in plan and partly in section showing the drum for imparting movements to the needle and to the looper and also the rack for rotating the looper:
  • Fig. 3 is a vertical sectional View through the standard of the machine showing the means actuated by the drum which imparts movements to the looper;
  • Fig. 4 is a view partly in end elevation of the machine with the cover plate for the needle head removed, and partly in section through the work arm showing the mounting for the looper;
  • Fig. 5 is an end view of the overhanging arm with the cover plate removed and showing the presser foot as lifted from the fabric and the spring for the presser foot released;
  • Fig. 6 isa view similar to Fig. 5, showing the spring under tension and the presser foot bearing on the work support;
  • Fig. '7 is a detail showing the cam for lifting view through the presser point is entering the needle thread loop
  • Fig. 10 is a plan view of certain of the parts shown in Fig. 9;
  • Fig. 11 is a diagrammatic view showing the needle reciprocating mechanism
  • Fig. 12 is a diagram showing the relative timing of the needle, the oscillations of the looper and the rotations of the looper;
  • Fig. .13 is a diagrammatic view showing the looper after it has been rotated about the axis of the needle through an arc of 360 degrees, with the point of the needle slightly below the top of the blade of the looper;
  • Fig. 14 is a similar view, but showing the looper as having rotated in a reverse direction through an arc of 180 degrees, and as having I placed one strand of the needle thread loop on the looper against the face of the needle adjacent its point
  • Fig. 15 is a view similar to that shown in Fig. 14, but showing the looper as having been rotated in the reverse direction through an arc of 360 degrees, and as having placed the looper thread loop about the needle so as to insure the needle entering the needle thread loop on its down-stroke.
  • the invention is directed to an improvement in a single chain stitch machine for forming enchained thread loops for closing openings, such for example, as the darning of holes in bags.
  • the machine includes a needle and a looper which is a non-thread carrying looper and which cooperates with the needle in forming the single chain stitches.
  • the looper is moved into the needle thread loop and comes to a dwell at the forward end of its stroke. The needle is given.
  • the needle is given a reciprocation by a bodily rotating member, which in turn is rotated and is provided with a crank connected by a link to the needle bar.
  • the arrangement is such that the needle on its down-stroke is given a substantial dwell at the time stated.
  • the looper is oscillated by a link and lever connection to a drum on the main shaft.
  • the looper is rotated by a rack which is moved endwise by a link and lever connection to a drum on the main shaft.
  • needle guides for directing the needle so as to insure that the looper will properly pass the needle in entering the needle thread loop.
  • the presser foot is particularly constructed so as to take care of any unevenness in. the fabric sections being stitched.
  • the presser bar carrying the presser foot is urged downwardly by a spring which is put under tension by the needle bar on its downward stroke.
  • the tension of the spring is released in part, and the presser foot is lifted at this time by a cam rotating with the needle actuating mechanism.
  • a machine which includes a supporting standard 1 carrying an overhanging arm 2 in which the main operating shaft 3 is mounted for rotation.
  • a work supporting arm 4 which is generally of a cylindrical character.
  • a needle head At the forward end of the overhanging arm 2 is a needle head in which a needle bar 5 is mounted for reciprocation.
  • Said needle bar carries a needle 6.
  • the main shaft 3 extends through a stationary bearing sleeve 7 which is provided with a pinion 8. This sleeve is held from rotation by a set screw 9, and this holds the pinion stationary.
  • a casing 10 Secured to the shaft is a casing 10 which rotates with the shaft.
  • a pinion 11 which meshes with the stationary pinion 8.
  • This pinion 11 carries a crank pin 12.
  • a link 13 connects the crank pin to a pin carried by a collar clamped to the needle bar.
  • the movement imparted to the needle bar is indicated diagrammatically.
  • the needle bar is indicated at 5; the axis of the main shaft at 2; the traveling pinion at 11; the crank pin at 12, and the link connecting the crank pin to the needle bar at 13.
  • the crank pin is moving'from the position 12 to the position 12*, the needle bar is moving upwardly to the upper end of its stroke. 0n the downward stroke of the needle bar, there is a sub stantial dwell in the movement thereof when the crank pin reaches the position 12.
  • the movement of the needle bar is indicated by the curved line :c, w. It will be noted from this diagram that the needle bar moves quickly on its up-stroke to the'point 11:. It then moves downwardly, and from the point 162 to the point :8 it is substantially at a dwell.
  • the presser foot is carried by a presser bar 16.
  • the presser foot as shown in Fig. 8, is formed in two sections under surface with slots through the side walls thereof.
  • the lower portion 15 of the presser foot is curved to fit this spherical surface and is provided with bolts 17, 17 which are threaded into the outer foot portion and pass through these slots in the inner portion 15 with the bolts yieldingly hold the two parts in set positions relative to each other.
  • the slots are' of
  • the inner section 15 has a spherical Springs l8, l8 associated sufficient size to permit the under or main portion 15 of the presser/foot to shift on the inner portion to accommodate any unevenness in the fabric sections.
  • the presser foot is forced downwardly by a spring 19 which surrounds the presser bar and bears at its lower end against a collar 20 attached to the presser bar.
  • This spring bears at its upper end against the forked arm 21 of a collar 22 which is clamped to the needle bar.
  • Said forked arm can slide up and down on the presser bar, and when the needle moves downward, said arms will compress the spring 19, putting it under tension, which tends to force the presser bar downward and the presser foot into engagement with the material.
  • the tension on the spring 19 is released, so that the presser bar may be readily lifted.
  • the means for lifting the presser bar is shown in Figures 1 and '7.
  • Mounted on the casing 10 which rotates with the main shaft 3 is a cam 23.
  • Mounted in a sleeve 24 in the needle head is a bar 25 carrying-a roller 26 at the lower end thereof. This bar is clamped to an arm 27 which is also clamped to the presser bar.
  • the cam is timed so as to lift the presser bar when the needle bar is at the upper end of its stroke and the tension on the spring 19 released.
  • a looper 28 which is a non-thread carrying looper.
  • the looper blade has a point which is adapted to enter the needle thread loop.
  • the looper is carried by a shank 29 which is mounted in the looper carrier 30.
  • the looper carrier 30 is attached to a shaft 31 mounted in supporting sleeves 32, 32 carried by a looper support 33.
  • the looper is oscillated on its support, and during its oscillations, the shaft 31 turns in these supporting sleeves 32.
  • the looper is oscillated by means of a rod 34 which is attached to a head 35 engaging a ball 36 formed in the shank 29 supporting the looper.
  • the other end of the rod is connected to a lever 37 which is mounted for free oscillation on a cross shaft 38.
  • This groove 39 which oscillates the looper is so shaped that the looper is given an extended dwell when at the forward end of its stroke.
  • the dot and dash line y, y in Fig. 12 indicates the movement of the oscillating looper.
  • the looper moves forward into the needle loop very quickly and then comes to a dwell, and is at a dwell from the point y to the point 11 During this dwell in the looper, the needle moves upward to the upper end of its stroke, thence downward, dwelling as described above, and finally the looper is retracted as the needle is approaching the lower end of its stroke.
  • the support 33 for the looper is mounted for rotation substantially about an axis in line with the needle.
  • the support is provided with. a coneshaped member 41 engaging a bearing sleeve 42 mounted in the work arm. It is also attached to a cone member 43 engaging the bearing sleeve 42 at the lower end thereof.
  • the looper support is provided with a pinion 44 which meshes with a rack'bar 45.
  • the rack bar 45 is provided with cylindrical portions at its ends fitting within a sleeve 46.
  • the bore in the sleeve is eccentric to the axis of the sleeve so that when the sleeve is rotated, the rack bar will be shifted toward and from the pinion 44 with which it meshes.
  • the sleeve may be rotated by aid of the closure screw .47 (see Fig. 2).
  • the rack bar is reciprocated by means of a rod 48 which is pivotally connectedto the end of the rack bar.
  • This rod is also pivoted to the end of a lever 49 which cooperates with a groove 50 in the drum 40.
  • This groove 50 is soshaped and disposed relative to the groove 39 that the looper is rotated first in one direction and then the other through substantially a complete rotation of 360' degrees while the looper is at the forward end of its stroke.
  • the movement of rotation which is imparted to the looper is indicated by the broken dash line.
  • the looper is at a rest, so far as rotation is concerned, when it. -is oscillated and moved forward into the needle thread loop.
  • the looper begins its rotation, and at this time, the needle is on its up'-stroke, and the looper is at the forward end of its stroke, and has come to the point 11' where it is at a dwell.
  • the looper is rotated, therefore, on the up-stroke of the needle, and will give a twist to the shank of the needle thread loop which is on the looper.
  • This twisting of the looper thread does not, in any way, function in the stitch formation, but is merely a positioning of the looper preparatory to placing the needle thread loop about the needle on its reverse rotation.
  • needle guides are secured to the looper beneath the blade thereon, and are so positioned that when the looper moves forward, the guides will first pass the needle, and if it is deflected from its proper position, will insure that it be placed H so that theflooper will pass the needle on the right side thereof and close to the needle as it enters the needle thread loop.
  • a guide plate 52 is attached toa vertical web carried by the work arm for preventing the rod 34 from lateral movement during the rotation of the looper.
  • the rack bar and the pinion operated thereby are lubricated by means of a-port 53 which leads through a sleeve into the inner chamber thereof.
  • the needle passes through the work support and throws out its loop which is engaged by the non-thread carrying looper.
  • the looper when it reaches the forward end of its stroke, remains at a-dwell while it is rotated in first one direction and then the other.
  • the needle after it has passed through the work support so that its point is a slight distance below the upper edge of the looper blade, remainsat a dwell.
  • the looper also remains at a dwell at this time so far as its oscillations are concerned, and is rotated in a reverse direction for positively placing the needle thread loop carried thereby about the needle.
  • the needle When the needle reacheskthe upper end of its stroke, it releases the tension on the spring, 10c forcing the presser foot downward, and the presser foot is also lifted so as to permit the material to be freely turned and fed in any direction.
  • said presser foot having a fabric engaging portion provided with a spherical surface at its upper side adapted to engage a spherical surface on the supporting shank of the presser foot, said fabric engaging surface being shiftable on the shank to accommodate varying thicknesses of material.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US558585A 1931-03-25 1931-08-21 Chain stitch sewing machine Expired - Lifetime US1929322A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEU11200D DE574769C (de) 1931-03-25 1931-03-25 Kettenstichnaehmaschine

Publications (1)

Publication Number Publication Date
US1929322A true US1929322A (en) 1933-10-03

Family

ID=6344185

Family Applications (1)

Application Number Title Priority Date Filing Date
US558585A Expired - Lifetime US1929322A (en) 1931-03-25 1931-08-21 Chain stitch sewing machine

Country Status (4)

Country Link
US (1) US1929322A (fr)
DE (1) DE574769C (fr)
FR (1) FR722657A (fr)
GB (1) GB376103A (fr)

Also Published As

Publication number Publication date
FR722657A (fr) 1932-03-23
GB376103A (en) 1932-07-07
DE574769C (de) 1933-04-25

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