US2174205A - Method of and apparatus for performing looping on a multineedle seam covering sewing machine - Google Patents

Method of and apparatus for performing looping on a multineedle seam covering sewing machine Download PDF

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Publication number
US2174205A
US2174205A US94246A US9424636A US2174205A US 2174205 A US2174205 A US 2174205A US 94246 A US94246 A US 94246A US 9424636 A US9424636 A US 9424636A US 2174205 A US2174205 A US 2174205A
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US
United States
Prior art keywords
finger
needles
point
seam
sewing machine
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
US94246A
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English (en)
Inventor
Ebert Fritz
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.)
Mauser Werke AG
Original Assignee
Mauser Werke AG
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
Priority claimed from GB1940736A external-priority patent/GB478206A/en
Application filed by Mauser Werke AG filed Critical Mauser Werke AG
Application granted granted Critical
Publication of US2174205A publication Critical patent/US2174205A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B29/00—Pressers; Presser feet
    • D05B29/06—Presser feet
    • 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 method and also an apparatus enabling articles or pieces of work to i be sewn continuously in such fashion on a multiineedle seam covering sewing machine that loop- .5 .ing is also performed between the. pieces of work,
  • the purpose of the invention is to provide fimeans 'IfOI" "adapting the length of the needle threaddrawn at any time, to the thickness of thematerial; so that also'in embroidering without material the correct length of the thread and therefore'a regular formation .of stitch is obtained.
  • a finger is provided attached to the pressure foot rod and which thus effects upward and downward movement corresponding to the thickness of the material present. Therefore, corresponding to the thickness of the material the finger determining the place of catching will lie higher or lower and will draw off the necessary thread length required for the desired size of loop.
  • the finger is also pivotable about thepressure foot rod in a horizontal planein order that, at the beginning of the down stroke of the needles it can be swung in close behind these inthe path. of the needle. threads, and upon .arrival of the needles in the lowest position, when w the looper again moves-forward, will again move .back in order that the needle threads may slide .ofi thelooper and --after.falling downwards can form loops.
  • a feature of the invention also consists in the finger moving in.
  • Fig. 1 is a perspective view of the sewing machine, in which only those parts have been shown which directly pertain to the invention.
  • Fig. :2 is a plan view of the looping device in whichthe finger has been advanced up to the middle needle.
  • Fig. 3 is an elevational view in vertical section.
  • :-.-Figs. 4 and :5. are similar elevational views in 1'55 vertical section before and after the downward movement of the needles.
  • Figs. 6 and 7 are a rear view and sectional plan view respectively of the drive.
  • Figs. 8 to 10 illustrate progressively the formation of the seam.
  • the sewing machine in conjunction with which the method according to the application will be described, is assumed to be of the supporting arm type.
  • the sewing .or stitching mechanism is of the usual kind, this also applying to the drive for the elements producing the seam.
  • these elements comprise three needles I, the looper 3 operating in the arm 2 and the presser 4.
  • the needles I guide the threads 5 and the looper 3 guides the thread 6.
  • the method according to the invention consists in the fact that the needle threads 5 upon the downward movement of the needles I are prevented from being drawn and also prevent the looper 3 from entering the needle thread loops.
  • this is effected by means of a finger I, which is preferably comparatively thin and curved and may be resilient in itself, but may also be of other form.
  • This finger I moves prior to the downward movement of the needles I behind the latter or between their path of movement and the needle threads 5, as shown more particularly in Figs. 4 and 8.
  • the needle threads 5 are then held by the finger I, as shown in Figs. 5 and 9, so that the looper 3 is able to enter the needle thread loops 8, as shown in Fig. 10.
  • a finger I is provided attached to the pressure foot rod 9 and which thus effects upward and downward movement corresponding to the thickness of the material present. Therefore, corresponding to the thickness of the material the finger I determining the place of catching will lie higher or lower and will draw off the necessary thread length required for the desired size of loop.
  • the finger I is also pivotable about the pressure foot rod 9 in a horizontal plane in order that, at the beginning of the down stroke of the needles I it can be swung in close behind these in the path of the needle threads 5, and upon arrival of the needles I in the lowest position, when the looper 3 again moves forward, will again move back in order that the needle threads 5 may slide off the looper 3 and after falling downwards can form loops.
  • a feature of the invention also consists in the finger I moving in a transverse slot in the pressure foot 4 whereby the finger not only receives an exact guiding but is also given a support when the overlying thread is drawn downwards.
  • the finger may thus be made comparatively thin.
  • the finger I may be controlled in desired fashion.
  • it is mounted to be capable of rocking motion, viz., about the presser rod 9.
  • it is located on an arm In which rocks about the rod 9 and to which the rocking motion is imparted by the machine drive or the drive for the looper 3, so that a separate drive is not required.
  • a second arm l3 For the operation of the finger 1 there is provided on the arm II, which rocks the transverse member l2 for controlling the looper 3, a second arm l3.
  • This arm through the medium of a ball and socket joint and lever 14, reciprocates a lever I5, which is mounted to oscillate on a pin I6.
  • a radial slot l8 In an upwardly extending arm ll of lever l5 there is provided a radial slot l8, in which there may be adjusted radially a bolt H! which forms the head of a connecting rod 20 that engages on the other hand with a bolt 2
  • the connecting rod 20 is furnished with a left and right hand thread 22, so that the position of the finger I may be varied by turning the rod 20.
  • the arm I is not mounted in direct fashion on the presser rod 9, but on an eccentric sleeve 23 which may be turned on the rod 9 and locked by means of a screw 24.
  • the sleeve 23 By turning the sleeve 23 the finger 1 may be so adjusted that it comes to rest in a position immediately behind the needles I, i. e., swings closely behind the same, no matter what the thickness of the needles may be.
  • the finger I may also be adjusted in height.
  • a guide opening 26 for the shaft of the finger I in which opening the said shaft may be moved up and down, being held in position by a screw 21.
  • the invention has been described in conjunction with a machine having three needles. There is, however, no restriction to the number of needles employed, and the invention may also be used for all kinds of needle positions, for example for the production of a combined plain stitch and covering seam, in which two covering needles operate behind the centre of the needle rod.
  • the holder 25 on the one hand is arranged to be capable of being readily exchanged, whilst on the other hand there are provided additional holders with corresponding lateral displacement of the finger I which holders may be interchanged.
  • the arrangement may also be such that the finger I is disengaged and maintained in this condition during the normal sewing of the material.
  • the fixed needle plate tongue which is the loop forming point is shown in Figs. 3 to and this tongue 50 is located in constant spacial disposal to the path of the looper, while the spacing between the point of formation of the loops (needle plate tongue) and the holding finger I is variable, viz., in adaption to the variable thickness of material, which between two pieces of material, is equal to 0.
  • the spacing between the point of formation of the loops (needle plate tongue) and the holding finger I is variable, viz., in adaption to the variable thickness of material, which between two pieces of material, is equal to 0.
  • a seam covering sewing machine a plurality of needles, a presser foot, a fixed needle plate tongue constituting the point of formation of the loops, and a finger movable together with the said presser foot for firmly holding the needle threads, upon each downward movement of the said needles, at a point which is variable in relation to the point of formation of the covering seam.
  • a seam covering sewing machine a plurality of needles, a presser foot, a fixed needle plate tongue constituting the point of formation of the loops, and a finger adapted to rock about a verth cal axis and movable together with the said presser foot for firmly holding the needle threads, upon each downward movement of the said needles, at a point which is variable in relation to the point of formation of the covering seam.
  • a seam covering sewing machine a plurality of needles, a presser foot, a fixed needle plate tongue constituting the point of formation of the loops, and a finger adapted to rock about the rod of the said presser foot and connected therewith in positive fashion for firmly holding the needle threads, upon each downward movement of the said needles, at a point which is variable in relation to the point of formation of the covering seam.
  • a seam covering sewing machine a plurality of needles, a presser foot, a fixed needle plate tongue constituting the point of formation of the loops, and a finger adapted to be lifted in common with the said presser foot for firmly holding the needle threads, upon each downward movement of the said needles, at a point which is variable in relation to the point of formation of the covering seam.
  • a seam covering sewing machine a plurality of needles, a presser foot, a fixed needle plate tongue constituting the point of formation of the loops, and a finger movable together with the said presser foot for firmly holding the needle threads, upon each downward movement of the said needles, at a point which is variable in relation to the point of formation of the covering seam, the path of movement of the said finger passing through the said presser foot.
  • a seam covering sewing machine a plurality of needles, a presser foot, a fixed needle plate tongue constituting the point of formation of the loops, a finger for firmly holding the needle threads, upon each downward movement of the said needles, at a point which is variable in relation to the point of formation of the covering seam, and means for adjusting the plane of the said finger in relation to the said needles.
  • a seam covering sewing machine a plurality of needles, a finger for firmly holding the needle threads, upon each downward movement of the said needles, at a point which is variable in relation to the point of formation of the covering seam, and means for displacing the said finger vertically comprising a finger holder having an opening therein adapted to receive a shaft of the said finger and serving for vertical adjustmentof the finger.
  • a seam covering sewing machine a plurality of needles, a presser foot, a fixed needle plate tongue constituting the point of formation of the loops, a looper, a finger rocked by the drive of the said looper for firmly holding the needle threads, upon each downward movement of the said needles, at a point which is variable in relation to the point of formation of the covering seam, and an adjustment device for controlling the extent of the rocking movement.
  • a seam covering sewing machine a plurality of needles, a presser foot, a fixed needle plate tongue constituting the point of formation of the loops, a looper, a transverse shaft driving the said looper, and a finger rocked by the said transverse shaft for firmly holding the needle threads, upon the downward movement of the said needles, at a point which is variable in relation to the point of formation of the covering seam.
  • a seam covering sewing machine a plurality of needles, a presser foot, a fixed needle plate tongue constituting the point of formation of the loops, a looper, a transverse shaft driving the said looper, a finger for firmly holding the needle threads, upon each downward movement of the said needles, at a point which is variable in relation to the point of formation of the covering seam, and an arm on the said transverse shaft for actuating the said finger.
  • a seam covering sewing machine a plurality of needles, a presser foot, a fixed needle plate tongue constituting the point of formation of the loops, a looper, a finger rocked by the drive of the said looper for firmly holding the needle threads, upon each downward movement of the said needles, at a point which is variable in relation to the point of formation of the covering seam, and means connecting the said looper drive with the said finger, the transmission ratio between the said looper drive and the said finger being variable by varying the point of engagement of the said connecting means.
  • a seam covering sewing machine a plurality of needles, a presser foot, a fixed needle plate tongue constituting the point of formation of the loops, a looper, a finger rocked by the drive of the said looper for firmly holding the needle threads, upon each downward movement of the said needles, at a point which is variable in relation to the point of formation of the covering seam, means for connecting the said looper drive with the said finger, and means for adjusting the said connecting means.
  • a method of performing looping on a multineedle seam covering sewing machine comprising the step of firmly holding the needle threads, upon each downward movement of the needles, at a point which is variable in relation to the point of formation of the covering seam and lifting the needle threads to perform the looping in dependence upon the thickness of the material and during the upward movement of the needles the needle threads being freed.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US94246A 1935-02-21 1936-08-04 Method of and apparatus for performing looping on a multineedle seam covering sewing machine Expired - Lifetime US2174205A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1935M0130157 DE691420C (de) 1935-02-21 1935-02-21 Verfahren und Vorrichtung zum Ketteln auf Mehrnadel-UEberdeck-Naehmaschinen ohne Legfaeden mit und ohne Stoff
GB1940736A GB478206A (en) 1936-07-13 1936-07-13 An improved method of and apparatus for performing looping on a multi-needle seam covering sewing machine

Publications (1)

Publication Number Publication Date
US2174205A true US2174205A (en) 1939-09-26

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US94246A Expired - Lifetime US2174205A (en) 1935-02-21 1936-08-04 Method of and apparatus for performing looping on a multineedle seam covering sewing machine

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BE (1) BE416611A (enrdf_load_html_response)
DE (1) DE691420C (enrdf_load_html_response)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3882806A (en) * 1972-10-20 1975-05-13 Rimoldi C Spa Virginio Cover thread pulling and take-up device for multineedle sewing machines
FR2388918A1 (fr) * 1977-04-28 1978-11-24 Rockwell Rimoldi Spa Procede et dispositif pour former une chainette continue de points en l'absence de l'ouvrage avec une machine a coudre a deux aiguilles jumelees et crochet inferieur unique

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3882806A (en) * 1972-10-20 1975-05-13 Rimoldi C Spa Virginio Cover thread pulling and take-up device for multineedle sewing machines
FR2388918A1 (fr) * 1977-04-28 1978-11-24 Rockwell Rimoldi Spa Procede et dispositif pour former une chainette continue de points en l'absence de l'ouvrage avec une machine a coudre a deux aiguilles jumelees et crochet inferieur unique

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Publication number Publication date
BE416611A (enrdf_load_html_response)
DE691420C (de) 1940-05-25

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