US2482079A - Loop-spreader mechanism for chainstitch sewing machines - Google Patents

Loop-spreader mechanism for chainstitch sewing machines Download PDF

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Publication number
US2482079A
US2482079A US732184A US73218447A US2482079A US 2482079 A US2482079 A US 2482079A US 732184 A US732184 A US 732184A US 73218447 A US73218447 A US 73218447A US 2482079 A US2482079 A US 2482079A
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United States
Prior art keywords
loop
spreader
looper
bed
shaft
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
US732184A
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English (en)
Inventor
Frederick F Zeier
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.)
Singer Co
Original Assignee
Singer Co
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 Singer Co filed Critical Singer Co
Priority to US732184A priority Critical patent/US2482079A/en
Priority to GB14028/47A priority patent/GB623904A/en
Priority to CH258562D priority patent/CH258562A/de
Priority to FR951824D priority patent/FR951824A/fr
Application granted granted Critical
Publication of US2482079A publication Critical patent/US2482079A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • This invention relates to sewing machines and more particularly to those of the two-thread chain-stitch type employing a thread-carrying looper, and the invention has for an object to provide an improved loop-spreading mechanism for engaging and spreading one limb of the looperthread-loop to form with the needle-thread-loop which is about the looper the usual threadtriangle for entrance by the descending needle in forming the succeeding stitch.
  • Another object of the present invention is to provide a loop-spreader actuating mechanism having the component parts thereof so arranged that a minimum of effort is required to operate the mechanism, the parts can be readily assembled, manufacturing tolerances can be reasonably large, and necessary repair including the replacement of parts can be accomplished without excessive disassembly.
  • a further object of the present invention is to provide a loop-spreading mechanism in which the thread-engaging element may be universally adjusted in order to effect a very satisfactory timing of the thread-engagin element with the other stitch-forming devices.
  • the invention comprises the devices, combinations and arrangements of parts hereinafter set forth and illustrated in the accompanying drawings of a preferred embodiment of the invention, from which the several features of the invention and the advantages attaincd thereby will be readily understood by those skilled in the art.
  • Fig. 1 is a, front side elevational view, with a portion of the bed and cloth-plate in section, of a sewing machine embodying the present invention.
  • Fig. 2 is an enlarged top plan view of a portion of the machine-bed; the cloth-plate and the throat-plate having been removed to show more clrarly the mechanisms within the bed.
  • Fig. 3 is a transverse vertical sectional view taken substantially along the line 3-3, Fig. 2, showing the eccentric drive for the spreader mechanism and the anti-friction bearing interpoed between the periphery of the actuating eccentric and the pitman strap embracing said eccentric.
  • Fig. 4 represents a longitudinal vertical sectional view taken substantially along the line 4--4, Fig. 2.
  • Fig. 5 represents a longitudinal vertical sec- 2 tional view taken substantially along the line 5---5, Fig. 2.
  • Fig. 6 represents a transverse vertical sectional view taken substantially along the line 6-6, Fig. 2.
  • Fig. 7 is a. fragmentary top plan view of the looper and spreader, illustrating the looper just entering the needle-thread-loop during the loopseizing stroke of the looper.
  • Fig. 8 is a right side elevational view, partly in section, of the elements shown in Fig. 7.
  • Fig. 9 is a view similar to Fig. '7, but showing the looper at the end of its loop-seizing stroke and the spreader engaging one limb of the looperthread-loop preparatory to distending the same for entrance by the needle on its next work-penetrating stroke.
  • Fig. 10 is a, right side elevational view, partly in section, of the elements shown in Fig. 9.
  • Fig. 11 is a view similar to Fig. 9, but showing the looper retracting to shed the needle-threadloop and the looper-thread-loop fully distended by the spreader.
  • Fig. 12 is a right side elevational view, partly in section, of the elements shown. in Fig. 11.
  • Fig. 13 is a fragmentary front ide elevational view of the sewin machine bed, showin a modification of the spreader-carrying arm adapted for use on a wide gauge machine. 7
  • Fig. 14 is a top plan view, with the cloth-plate and throat-plate-removed, of that portion of the sewing machine bed shown in Fig. 13.
  • Fig. 15 represents an enlarged vertical sectional view taken substantially along the line I 5-l 5, Fig. 14. r 7
  • the invention is shown as embodied in a sewing machine comprising a frame includin a bed 20 from one end of which rises a standard 2
  • the needles 25 are adapted to penetrate work sustained on the work-support by a common form of presserfoot 26, which work-support includes a throatplate 21 and cloth-plates 28 and 29.
  • the work is fed through the machine by means of the vibratory needles 25 and the cooperating feeddog 30 supported on a feed-bar 3
  • the thread-carrying loopers 32 Cooperating with the threaded needles in forming two-thread chain-stitches are the thread-carrying loopers 32 supported for oscillation in a vertical plane parallel to the line of feed in a looper-carrier: 33 mo unted'on a fixed fulcrurn-shaft- 3 isu pported at opposite ends in bushings 34 located in the transverse partitions 35 and 35 of the bed 23.
  • the looper-carrier 33 is actuated through a rock-lever 31 and link 38 from a, crank 39 mounted on the end of a rotary main or bed-shaft 4E] journaled in suitable bearings H and 52 (Fig. 1) provided in the bed 23.
  • the loopers 32 have only 'loopseizing and loop-shedding strokes and that these two motions are coordinated with the reciprocatory and vibratory feeding movements of the needles 25 to effect stitch;formation.
  • each of the two-motion loopers 32 has cooperating there- I with a spreader-finger 43 (Fig. 2) which is adapted to engage and distend one limb of the looperthread-loop to form the usual thread-triangle with the previous needle-thread-loop for entrance by the descending needle.
  • a spreader-finger 43 Fig. 2 which is adapted to engage and distend one limb of the looperthread-loop to form the usual thread-triangle with the previous needle-thread-loop for entrance by the descending needle.
  • the spread-ers 43 are preferably rigidly fastened to a flat carrier or arm 54 formed with a shank 45
  • Theshank 45 is slotted, as at 56, through which extends a clamp-screw 41 threaded into a carrier-arm holder or block 48 secured by set-screws 49 on the forward end of an endwise reciprocatory actuating or spreadersupporting bar 50.
  • Adjustment of the spreader fingers 43 vertically and horizontally in a direction toward or away from the loopers 32 is accomplished by loosening theset-screws 49 and turning or shifting th'e block 48 on the spreadersupporting bar 50, while adjustment of the spreader-fingers in a substantially horizontal direction parallel with the lineof fee-d is accomplished by backing off the clamp-screw 41 and shifting the carrier ifrelative to the block 58.
  • the block 48 is formed with a tongue 5
  • the spreader-supporting bar 59 is journaled for endwise movement in the spaced bearings 53 and i 54 (Fig. 2) of a bearing-bracket 55 detachably secured on a supporting lug 56 cast integral with the front wall 5'! and transverse partition 36 of r the bed 20, the screws58 and. locating pins 59 serving to fasten thebracket 55 in its alined position.
  • the rearward end of the spreader-supporting bar 55 is preferably formed as a yoke 60 I in the limbs of which is freely journaled a horizontally disposed connector-pin 5
  • the rock-arm 63 is fastened on a transverse spreader-driving rock-shaft 54 j ournaled at its opposite ends preferably in needlebearings fiiipressed into the side-walls of the bed 20, as clearly shown in Fig. 2.
  • the spreader-driving shaft 54 is restrained against endwise shifting in its bearings 55 by two collars 56 clamped on the shaft 6 1.
  • The'means for rocking the spreaderdriving shaft 64 comprises a horizontal rock-arm (Fig.
  • the eccentric I4 is formed with a weigh-ted section 8ll and the flange 11 is formed with a similar weighted section 8
  • the driving rock-arm 63 is formed with a.
  • the spreader 53 does not perform any useful function;
  • Figs. 9 and 10 disclose the looper, at the end of its loop-seizing stroke and the needle 25 at the highest point of its stroke. It will be seen that the spreader 43'has engaged a limb of the "looper-thread LT and ispreparing to carrying said limb to a position further to the right.
  • 11 and 12 disclose the looper 32 retracting to shed the needle-thread-loop NT, the needle 25 descend- O ing to enter'the thread triangle and the spreader 53 at the end ofits-loop-distending stroke. From the above, it will be understood that the spreaderfinger- 43 engages and spreads one limb of the looper thread so that the needle 25 on its descending stroke will unerringly enter the spread thread-triangle, regardless of the fact that the needIe apertu're is not stationary but is formed in the feed-dog 30'and shifts back and forth in the'line'of feed.
  • Figs. 1, 2, 5 and 6 are illustrative of a spreader mechanism as applied to a narrow gauge sewing machine, i. e. one in which the needles and loopers are relatively closely spaced.
  • Figs. 13 and 14 disclose a modification'of the spreader mechacnism which-is adapted for wide gauge sewing machines. Referring to these two figures it will be observed th'attheloopers 32 are widely spaced and are supported-by 'a'looper-carrier 83 journaled for oscillation on'a fixed fulcrum-shaft 34 supported at opposite endsin the bushings 34' located inthe transverse partitions 35 and 36 of the bed 25.
  • the looper-carrier 83 is oscillated on the fulcrum-shaft 34 by the'same means hereinbefore described in connectionwith the loopercarrier33.
  • Cooperating with the widely spaced loopers 32 are the spreader-fingers 84 (Fig. 14) preferably integral with a carrying-bar 85.
  • the carrying-bar 85 preferably has a rectangular cross-section andis supported adjacent its opposite ends for'endwise reciprocation against the under side of the throat-plate 2'! by two slotted bearing-blocks or guides 86, each of the bearingblocks being provided with elongated holes 81 through which extend screws 88 threaded into the throat-plate 21.
  • the spreader carrying-bar 85 is reciprocated endwise by the actuating bar 55 and the means employed for connecting said carrying-bar 85 to said actuating bar 50 preferably comprises a connector-head 89 secured on the outer end of the actuating bar 50 by the setscrews 90 affording limited adjustment of said head lengthwise of said actuating bar 59.
  • the other end of the connector-head 89 is formed with a channel 9! opening into the upper face of the connector-head, into which open topped channel projects a block 92 depending from the right hand end portion of the carrying-bar 85.
  • the blockand-channel connection with the actuating bar 50 facilitates removal of the throat-plate 21 and spreader-fingers 84 as a unit from the machine cloth-plate 28.
  • the block-and-channel connection also accommodates whatever misalinement which may exist between the carrying-bar 85 and the actuating-bar 50.
  • a thread-carrying reciprocatory needle of complemental stitchforming mechanism including a thread-carrying looper, means for imparting loop-seizing and loopshedding movements to said looper, a loopspreader, means for operating said loop-spreader including an actuating bar provided with a connector-pin, a bracket detachably secured to said bed and providing a bearing for said actuating bar, a rock-shaft, means for operating said rockshaft, and means connecting said rock-shaft to said actuating bar including a rock-arm fast on said rock-shaft and having a lever-portion thereof slidingly disposed in said connector-pin.
  • a thread-carrying reciprocatory needle of complemental stitchforming mechanism including a thread-carrying looper, means for imparting loop-seizing and loop-shedding movements to said looper, a loopspreader movable transversely of the movements j 6 of said looper, an endwise movable loop-spreader actuating bar provided with a connector-pin, a carrier for said loop-spreader adjustably secured on said actuating bar, a bracket providing a bearing for said actuating bar detachably secured to said bed, a rock-shaft, means for operating said rock-shaft, and means connecting said rock-shaft to said actuating bar including a rock-arm secured on said rock-shaft and having a lever-portion thereof slidingly disposed in said connector-pin.
  • a threadcarrying reciprocatory needle of complemental stitch-forming mechanism including a threadcarrying-looper, means for imparting loop-seizing and loop-shedding movements to said looper, a loop-spreader, an actuatin bar supporting said loop-spreader and endwise movable in a direction substantially normal to the loop-seizing and loop-shedding movements of said looper, a rockshaft journaled in said bed transversely of said actuating bar, a rotary shaft journaled in said bed, means including a universal connection for operatively connecting said rock-shaft to said rotary shaft, and means including a second universal connection for connecting said actuating bar to said rock-shaft.
  • a threadcarrying endwise movable needle of complemental stitch-forming mechanism including a threadcarrying looper, means for imparting loop-seizing and loop-sheddin movements to said looper, a loop-spreader, an actuating bar endwise movable in a direction substantially normal to theloop-seizing and loop-shedding movements of said looper, a holder mounted on said actuating bar, a carrier for said 10op-spreader adjustably secured to said holder, a rock-shaft journaled in 3 said bed and disposed transversely of said actuating bar, means for operating said rock-shaft, and means operatively connecting said actuating bar to said rock-shaft, said means having capacity to accommodate slight misalinem'ent between said actuating bar and said rock-shaft.
  • a threadcarryin looper means for moving said looper so that the beak thereof travels in a vertical plane, a loop-spreader, a bracket detachably secured to said bed, an actuating bar journaled in said bracket for reciprocation in a direction substantially normal to the plane of movement of said looper-beak, means adjustably securing said spreader to one end of said actuating bar, a rockshaft journaled in said bed and disposed substantially parallel with the plane of movement of said looper-beak, means including a universal connection operatively connecting said rock-shaft with said actuating bar, a rotary main-shaft journaled in said bed and disposed substantially parallel to said actuating bar, and means connecting said rock-shaft to said rotary main-shaft.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US732184A 1947-03-04 1947-03-04 Loop-spreader mechanism for chainstitch sewing machines Expired - Lifetime US2482079A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US732184A US2482079A (en) 1947-03-04 1947-03-04 Loop-spreader mechanism for chainstitch sewing machines
GB14028/47A GB623904A (en) 1947-03-04 1947-05-27 Loop-spreader mechanism for chain-stitch sewing machines
CH258562D CH258562A (de) 1947-03-04 1947-06-18 Schleifenspreizvorrichtung an Kettenstichnähmaschine.
FR951824D FR951824A (fr) 1947-03-04 1947-08-08 Mécanisme d'élargissement de la boucle pour machines à coudre au point de chaînette

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US732184A US2482079A (en) 1947-03-04 1947-03-04 Loop-spreader mechanism for chainstitch sewing machines

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US2482079A true US2482079A (en) 1949-09-13

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US732184A Expired - Lifetime US2482079A (en) 1947-03-04 1947-03-04 Loop-spreader mechanism for chainstitch sewing machines

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US (1) US2482079A (de)
CH (1) CH258562A (de)
FR (1) FR951824A (de)
GB (1) GB623904A (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2659329A (en) * 1950-09-19 1953-11-17 Singer Mfg Co Thread-controlling mechanisms for sewing machines
US2976831A (en) * 1956-09-14 1961-03-28 Singer Mfg Co Sewing machines
US3753410A (en) * 1972-05-12 1973-08-21 Singer Co Single thread chainstitch fittings for two thread chainstitch sewing machine
US4799440A (en) * 1981-08-11 1989-01-24 Maruzen Sewing Machine Co., Ltd. Looper changeover device
US4799439A (en) * 1981-07-14 1989-01-24 Maruzen Sewing Machine Co., Ltd. Double purpose looper for overlocking sewing machine
US4974534A (en) * 1987-09-29 1990-12-04 Pfaff Industriemaschinen Gmbh Double chain stitch sewing machine having a looper and a looper thread spreader

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1443084A (en) * 1919-10-17 1923-01-23 Union Special Machine Co Multiple-needle sewing machine
US1995078A (en) * 1933-07-24 1935-03-19 Union Special Machine Co Multiple needle sewing machine
US2312858A (en) * 1940-01-30 1943-03-02 Singer Mfg Co Chain-stitch sewing machine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1443084A (en) * 1919-10-17 1923-01-23 Union Special Machine Co Multiple-needle sewing machine
US1995078A (en) * 1933-07-24 1935-03-19 Union Special Machine Co Multiple needle sewing machine
US2312858A (en) * 1940-01-30 1943-03-02 Singer Mfg Co Chain-stitch sewing machine

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2659329A (en) * 1950-09-19 1953-11-17 Singer Mfg Co Thread-controlling mechanisms for sewing machines
US2976831A (en) * 1956-09-14 1961-03-28 Singer Mfg Co Sewing machines
US3753410A (en) * 1972-05-12 1973-08-21 Singer Co Single thread chainstitch fittings for two thread chainstitch sewing 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
US4974534A (en) * 1987-09-29 1990-12-04 Pfaff Industriemaschinen Gmbh Double chain stitch sewing machine having a looper and a looper thread spreader

Also Published As

Publication number Publication date
FR951824A (fr) 1949-11-04
CH258562A (de) 1948-12-15
GB623904A (en) 1949-05-25

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