US1048672A - Loop-taker for sewing-machines. - Google Patents

Description

LS. PINCE. LOOP TAKER PQR SEWING MAO'HNES APPLIGAMOH NLRB MM. m2.

Patented Des. 31, W12.

UNITED STATES PATENT OFFICE.

JOHN S. FINCH, OF BRIDGEPO/RT, CONNECTICUT, ASSIGNOR T0 THE SINGER MANU- FACTURING COMPANY, A CORPORATIONI OF NEW JERSEY.

LOOP-TAKER FOB. SWING-MACHINES.

Specification of Letters Patent.

Patented Dec. 31, 191 2.

Application tlled Haren 22, 1912. Serial No. 685,591.

T0 all 'whom it may con/cern:

Be it known that I, JOHN S. FINCH, a

citizen of the United States, residing atl Bridgeport, in the county of Fairfield -and State of Connecticut, have invented certain' loop about a cop orl obbi'n of under thread held in a non-'rotating bobbin-ease mounted lin an annular groove in the inner wall of the flange forming the cast-ofi' portion of the'loop-taker, substantially as is represented by U.S. .patent to lV. F. Dial, No. 480,181, dated August 2, 1892, and as machines of this type are well understood by those versed in the art, the present description will be confined, in so far as is possible, to ,the newffeat-ures in construction.

In the early constructions of loop-takers of the'character referred to above, the extension leading from the loop-taker throat tp the cast-off is convexed, between the base of the loop-seizing point and the periphery of the flange, in the direction of its rotation; and as is well understood, when the loopseizing point has entered the thread loop a sufficient distance to place the latter in contact with the loop-taker throat, the further rotation of the loop-taker draws from the supply, through the needle eye, suflicient thread to permit the bobbin-ease to pass through the loop, the thread being drawn over the convex portion, which offers a substantial resistance to the enlargementJ of the loop and the casting of the latter about the bobbin-case. When employing a Slack twisted thread, as is common to mercerized sewing cottons; such resistance demands a substantial decrease in the speed of the machine from what would be practical in connection with the use of smooth, well twisted, sewing threadhand even when the thread is of the most favorable twist and finish, such frictional engagement is detrimental to qlilality and quantity of product, if the mac ine is operated at a comparatively high s eed.

pTo facilitate the relative action of'looptaker and needle thread is the object of the present invention, and to this end the throat extension is so shaped as to permitl the thread to lie in a straight line, thus eliminating the binding or frictional condition incident to its drawing over the convex surface of said extension.

In the accompanying drawings illustrating the invention, in the several figures ot` which like' parts are similarly designated, Figure 1 is a view, in elevation, of a looptaker equipped with the present invention; Fig. 2 is a view in section on the line A-B, Fig. 1; Fig. 3 is an edge view of the looptaker shown in Fig. 1 and Fig. 4 isa plan 'view of the base portion of one form of commercial bobbin-case adapted for use in connection with the present loop-taker.

Referring to the figures, the loop taker con'lprises the base or back wall 1 l'ivmg formed integral with it a flange 2 temnating at one end in a loop-seizing point 3 and at its opposite end in a heel 4, said flange being partially cut away for a portion of its length to accommodate the mounting of thc adjustable gib 5. At the base of the flange 2 is .formed a guideway 6 for the reception of the guide flange 7 of the bobbincase base 8, the adjustable gib 5 making it: convenient to remove Aor replace the base 8, if desired` said gib being secured in operative relationship with said base by suitable screws (not. shown) passing through open; ings, as 9, formed in said flange, and threaded into openings, as 10, formed in said 11 represents a bracket or lug extending out from the bobbin-case base 8 and which` in practice contacts with a stationary lug (not shown) to hold said base against accidental rotation, and 12 is a bobbin-case base stud on which is mounted the commonly employed bobbin-case cap (not shown), betweenv which and said base is mounted to rotate the .commonly employed under thread bobbin or cop (not shown).

13 represents the loop-taker throat, 14 the throat extension, 15 the needle thread cast-oil and 16 an inclined edge formed by -the intersection of said extension and castolf, the inner edge of said inclined edge and the lower edge 0f said extension intersectin and terminating at the inner edge of sai cast-off.

17 represents a thread-loop guard formed integral with the loop-taker flange and acting to prevent the inner half of the thread 5 not limited in this respect, as it is practical to substitute the commonly employed l0optaker Washer, such, for instance, asis shown at the back of the loop-taker in full-line Figs. 7 and 8 and in central cross-section,

Figs. 5 and E), of Patent No. 480,181 referred to above.

In the operation of the loop-taker, as the needle thread passes in the direction of Y its length-about the throat, the rotation of the loop-taker causes the thread to ride the incline 16 its entire length (see Fig. 1), the throat acting as a pivot for the t-hread, and the incline acting to hold that portion of the thread leadingfrorn said throat to 20`said incline in a straight line, as will be readily understood.

The throat extension 14 and integrally vformed loop guard 17 constitute the constructive -features important to the present invention, but as such features do not materially change the mode of operation for forming the Stitch illustrated and described in the above :mentioned patent, further reference to such operation is deemed un- 0 necessary.`

Claims l. Ina loop-taker for sewing machines for engaging a loop of needle thread and without passing therethrough castingdt about the'under thread, the combination of a loop-seizing point, a needle thread cast- 'ol", ay throat,.a throat extension, and an inclined edge formed at the intersection of said cast-off and throat extension, Said inclined edge'acting to-hold in a. straight line that vportion of the needle thread loop leading from said inclined edge to said throat as 'said loop is carried by the rotation ,of the loop-taker in the direction of the axis of the latter.

2. In a loop-taker for sewing machines for engaging a loop of needle thread and without passing therethrough casting it about the under thread, the combination of a loop-seizing point, a rthread loop guard, a needle thread cast-off, a throat, a throat extension,. and an'inclined edge formed atI the intersection of said cast-ofi' and throat extension, said inclined edge acting to hold in a straight line that portion of the needle thread loop leading from said inclined-edge to said throat as said loop is Acarried by the rotation of the loop-taker in the direction of the axis of the latter.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing Witnesses.

JOHN S. FINCH. Witnesses:

T. W. 0mm, ABBIE M. DONIHEE.

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