US1436460A - Sewing machine - Google Patents

Description

.I. C. RINGE.

SEWING MACHINE- APPLICATION FILED 05%;.10. 1919.

\ INVENTOR JmQ We;

WITNESSES:

ATTORNEY J. c. RINSE. SEWINGMACHINE.

APPLICATION FILED DECJO. 19I9.

Patented Nov. 21, 1922,.

3 SHEETS-SHEET 2.

INVENTOR Jhn.

WITNESSES:

ATTORNEY J. C. RlNGE.

SEWING MACHINE.

APPLICATION. FILED DEC. 10. 1919.

1,43 ,4 PatentedNov. 21,1922.

3 SHEETS-SHEET 3.

WITNESSES: Q I INVENTOR BY V W V g V f i ATTORNEY.

Patented Nov. 21, 1922.

srA'rEs ATE JOHN C.. RINGE, OF STRATFORD, CONNECTICUT, ASSIGNOR TO THE SINGER MANUFAC- TURING COMPANY, OF ELIZABETH, NEW JERSEY, A CORPORATION OF NEW JERSEY.

SEWING MACHINE.

Application filed December '10, 1919. Serial No. 348,792.

To all whom it may concern:

Be it known that 1', J OHN C. RINGE, a citizen of the United States, residing at Stratford, in the county of Fairfield and State of Connecticut, have invented certain new and useful Improvements in Sewing Machines, of which the following is a specification, reference being bad therein to the accompanying drawings.

This'inve'ntion relates to improvements in sewin machines of the class commercially terme lock-stitch wherein there is employed an upper or needle-thread which, in the formation of the stitch, is concatenated with an under or bobbin-thread located in a suitable bobbin-case carried by the looptaker, and has for its object to provide improved means for passing a loop of needlethread about a mass of under thread, and to this end the bobbin-case is provided with a stop-lug and a stop-flange, the former cooperating with suitable lugs depending from the throat-plate and the stop-flange with an adjustably secured stop-finger, sald depend ings lugs and flange cooperating, through vertical movements of the loop-taker, to alternately restrain the bobbin-case from rotation and effect positive openings for the passage of the thread-loop about the mass of under thread, as will be more fully ex plained hereinafter.

Referring to the drawings, which form a part of the specification, Fig. 1 is a view in front side elevation of a sewing machine equipped with the present invention. Fig. 2 is an under side view of Fig. 1. Fig. 3 is a view in cross-section of the bed-plate illustrating the fabric-feeding andlooper-actuating mechanism in full lines. Fig. 4: is a plan view of a portlon of the bed plate, its needle-plate and the feed-dog, together with the under stitch-forming mechanism located directly below the back slide-plate. Fig. 5 is an, edge view of the needle-plate.

Fig. 6 is a view in erspective of the bobbin-- case stop-finger. ig. 7 is a detached View of the means employed for giving to the loo er its vertical movement.

eferring to the figures 1 represents the bedor cloth-plate of the sewing machine upon which is mount-ed the bracket-arm comprising the standard 2 and arm-bracket 3 into which is suitably journaled the usual main or needle-bar. 'actuatin shaft (not shown) provided with the ban -wheel 4 and at its forward end with a suitable link (not shown) operatively connected with the needle-bar 5 for giving to the latter its ver- 121021.101 stitch-forming movements. 6 denotes the -cloth-presser bar provided with the cloth- presser 7, 8 one form of commonly employed needle-thread take-up and 9 and 10 the needle-thread tensioning mechanism and needle-thread guides, respectively.

11 denotes a pulley suitably secured to the looper-actuating shaft 12 journaled in suitable bearings located below the bed-plate,

said shaft receiving rotary movements througha belt 13 and suitable pulley (not shown) corresponding to the pulley 11, and

at its forward end journaled ina bushing 114 suitably secured in the frame supporting ug 15.

16 represents the loop-taker bracket ad- 'ustably secured to the under side of the 7 5 ed-plate by screw 17 and provided with a bearing lug 18 and securing lug 1.9 into which latter is secured, by pinch screw 20, the bearing bushing 21 further held against accidental movement by the threaded into the frame-lug 23. 24 denotes a spiral gear suitably secured on the shaft 12 and meshing with a like gear 25 having a hub 26, later to be referred to, said gears.

being of the ratio of two-to-one, thus giving to the gear 25 two rotations to one of the looper-actuating shaft '12.

27 denotes the feed rockhaft havin suitably secured upon its rear end a cran -arm 28 to which is pivotally attached a feed con-" so nection 29 whose upper end is pivotally connected to one form of commonly employed feed-lever (not shown) operated from an eccentric (not shown) carried by the needlebar actuating shaft, said eccentric and bello5 crank-lever also acting, through a suitable rock-shaft (not shown), to transmit lateral movements to the needle. As the" above referred to feed and needle-actuating elements are common to man mabines it is 'deeme suflicient to refer to sue elements without including them in the figures. For a further understanding of the cooperation of the feeding and needleactuating elements see U. S. Patent No. 1%

929,761, August 3, 1909, to C. Gray. The forward end. of the rock-shaft 27 is provided with a yoke comprising the lugs 30 and 31 and cross-bar 32, the latter shown in dotted lines only, Fig. 2, and on said cross-bar is 110 screw 22 80 commercial sewing cured feed-dog 34, and suitably secured to anddepending from said bar 33 is a feeddog lifting fork 35 in engagement with an I eccentric 36 fast on the loop'er driving shaft 12. From the foregoing it will be understood that through the connections pointed out .feed movements are transmitted from the main-shaft to said feed-dog.

37 denotes the needle or throat-plate suitably secured upon the bed-plate and. provided with the feed-dog opening 38, the feeddog being provided with a needle-opening 39 to accommodate the lateral movements of the needle in the direction of seam formation. The present invention is in no way limited to whether or not the needle is moved laterally, and accordingly, further reference to such manner of control is unimportant. 40 and 41 denote the front an back slide-plates respectively.

Referring now to the more important inventive features in construction, 42 represents the loop-taker shaft mounted to rotate and to be moved endwise' in the bearing 43 of the bracket 16 and bushing 44 suitably secured in the lug 18 of said bracket, and upon the upper end of said shaft is-suitably secured the loop-taker 45 into whichis suitably journaled the bobbin case 46 provided with the bobbin 47 which, in turn, is provided with a mass of under thread 48, said bobbin-case being provided with; a stoplug 49 and stop-flange 50, said lug cooperating with the notch 51, at the under side of the needle-plate, to, at certain times, restrain the bobbin-case from rotation and the flange 50 to, at other times, cooperate with the free endof the adjustably secured stop finger 52 for the like purpose."

53 denotes a ,looper-actuating eccentric carried by the looper-actuating shaft 12 and 54 an eccentric connection one endof which is provided with a strap 55 encircling said eccentric and at its opposite end- 'pivotally connected to a rock-lever 57 whose free end is forked and internally provided with pins as 58 which track a groove .59 in the lower end of the loop-taker shaft '42, thelatter being provided with a'slot 60 which is entered by the inner end of a screw 61, the latter acting, through its connection with said slot, to transmit from the gear 25 r0- tary' movements to said looper-actuating shaft and permit the latter to be moved vertically to place the loop-taker in different horizontal planes. I I

In .the operation of the machine, supposing the needle to have been slightly raised from its limit of downward movement and the loop-seizing-point 62 of the loop-taker having passed into the needle-loop the further action of the needle and loop-takfer will cause the latter to operate and carry the loop of needle-thread about the bobbin-case, and a to free the loop from engagement with the stop-lug 49, the latter, by the action of the ,eccentrlc 53 through the connections pointed out, moves below the walls comprising the notch 51 in the needle-plate, thus providing "a free passage for the loop in itstravelabout the first half of the bobbin-case, such move ment of'the loop-taker bringing the lug 50 of the bobbin-case in contact with the free end of the finger 52, thus restraining the bobbin case from rotation at such time as 50 out of engagement with the finger 52 effecting. an opening for the loop and at the same time bringing the lug 49' within the notch 51, thus efiecting positive openings forthe travel of the loop while restraining the bobbin-case from rotation by the action of the loop-taker, followed by an idle rota tion of the loop-takerfwhile' the needle is completing the stitch-formation and returning to its position of loop-formation.

Having thus set forth the nature of the invention, what I claim herein is- 1. In a stitch-forming mechanism for sewingmachines, in combination, a needle, means for reciprocating said needle, a loopta'ker complemental to said needle in the formation of stitches, means for rotating said loop-taker, a thread-case journ'aled in said loop taker, means for restraining the thread-case against rotation with said looptaker, and means .for bodily reciprocating said loop-taker and. the-thread-case carried thereby to provide a free passage-for the needle-thread =loop past said restraining means. 4 2. In astitch-forming mechanism for sewing machines, invcombination, a needle, means. for reciprocating said needle, 2. looptaker oomplemental to said needle in the formation of stitches, means for rotating thelug 49 is out of engagement with the -walls of said notch, and ."as the loop said loop-taker upon a substantially vertical axis, a thread-case journaled in" said loop-taker, means for restraining the threadc'ase against rotation with said loop-taker,

-mechanism for eating said loop-taker and the tlire'ad-ca'se carried thereby to release the primary restraining means 'irom efl'ective action,

- and supplemental restraining means 'efi'ec tive upon release of said primary restraining means. v 4

4. In a stitch-forming mechanism .for sewing machines, in combination, a needle,- means for reciprocating said needle, a loop taker complemental to said needlein the formation of stitches, a thread-case jonrnaled in said loop-taker, a loop-taker actuatin shaft, means for rotating said looptaker rom said actuating shaft, an eccts'n,

tric carried by said actuating shaft, and operative connections intermediate'said eecentric and said loop-taker to impala-t bedily recipreeating movements t9 the latter;

5. In a. 'stitch-forming vmechanism for sewing machines,- in combination,- a needle, 20 means for reciprocating said needle, a 100 taker' complemental to said needle in t e formation of stitches, means for rotating said loop-taker, a thread-case journaled in sto -finger, and 'astop-flange carried by vsaid thread-case brought into BEGCQJLVE 'envgagementf with said stop-fingerupeia; re- 1 lease-of said K'QSH'EtiEZE? means, V j Q In testimony Wheres I have signedfimy 35, name-to thxs specificat on. v

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