US1041698A - Looper mechanism for sewing-machines. - Google Patents

Description

A.. B. TABOR.

Loorm MBGHANISM ma SEWING MACHINES. APPLIOATION II'LED MAY 2, 1910A RENEWED AUG. 1, 1912.y u 1,041,698, Patented 0G13. 15;.1912.

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28 jf'f A. B. TABUR. LOOPER MEGHANISM FOR SEWNG MACHINES. APPLIUATION IILED MAY 2, 1910. EENBWBD AUG. 1, 191`2.

1,041,698. Patented 061;.1 ,1912.

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ALBETNDTABOE, or PROVIDENCE, RHODE ISLAND, Assrenon To WILLcoX a Grens sEwIya MACHINE co., or

NEW YORK, N. Y., CORPORATION OF NEW YORK.'

Y LOOPE MEGHANISM FOR `SYEWINGMACHINES Specification of Letters Patent. Application led May 2, 1910, Serial No. 558,847.

Patented Oct. 15, 1912. Renewed August 1, `1912. Serial No. 712,779.

To all whom it may concern:

Be it known that I, ALBERT B. TABOR, of Providence, Rhode Island, have invented a new and useful Improvements in Looper Mechanism for Sewing-Machines, which invention is fully set forth in the following specification. v

-The present invention relates to an improved construction of looper mechanism, designed particularly for use in a 'sewing machine such as disclosed in an application for patent led by Stckton Borton, on December 13th, 1906, Sr. No. 347,649, in the production of a seam such as covered by patent to said Stockton Bortoli, No. 883,614, dated March 31, 1908; but obviously the looper mechanismof this invention is capable of use in other machines for the production of other seams.

The invention may be readily explained and understood by reference to the accompanying drawings illustrating what is now believed to be the preferred embodiment Y' vthereof as applied to a machine of the character disclosed in the aforesaid Borton application.

, In said drawings z-Figure 1 is a vertical sectional view showing stitch-forming elements of the machine in their relative positions when the vpoints of the needles have passed through the throat-plate and are about to enter the spread loops in the looper-threads; Fig. 2 is a view looking down upon the elements below the throatplate-also showing the lower ends of the' needles in section-when the parts are in the position shown in Fig. l; Figs. 3 and 4 are views similar to Figs, l and'V 2 respectively, with the needles farther down and their pointsin the loops in the'looperthreads; and Fig. 5 is a detail perspective view of the'toothed or hooked looper.

In the several views,- `the directions of movement of the moving parts are indicated by arrows.

l, 2, 3a and 4 are e gang of four parallel needles for tl1e four needle-threads 1, 2, 3, and 4 respectively. These needles are secured 'to' a common needle bar and reciprocate together, the needle ls being slightly shorter than the others, as shown, and for reasons hereinafter explained. lIn

having a depending horn 5, and a thread' carrier (not shown) work abovethethroat- `shown at 26, and a part of an auxiliary foot,

yieldingly carried by the main presser-foot? and'designated a chaining foot, is shown at 25. 28 is the throat-plate and 30 a piece of. fabric on which the mechanism is operating. v

Below the throat-plate there is a feedsurface, portions of which are shownV at 20 and 22, operating upward throughopenin'gs in the throat-plate to advance the work, the movement of the feed-surface being approximated by .the ellipse 166 in dotted lines Fig. 1. 14 is an oscillatory loopspreader having threadA engaging hookpoints or teeth 6", 7b and 9". 15 is a loopshedder fixed rigidly to the underside of the throat-plate 28 and acting to prevent move- 6, 7a, 8f* and 9, are four loopers, each having a depending right-.angled shank, shown in Fig. 5, through which screws, only one of which is shown at 193, pass to bindthe four loopers together and secure them to the looper-carrier, a part only of which is shown at 183. The screws mentioned also coperation with the other parts of the mechanism the loopers are moved in 'an elliptical path in a substantially horizontal' plane, such elliptical movement bein approximately illustrated by 'the dottedV line ellipse 199for the point of looper. As clearly shown, the loopers 6a and 7a are broken away in both Figs. 1 and 3, in order to show the third looper 8% in side elevation.

As shown in each of Figs. 1 to 4 inclusive,

the forward ends of the loopers are engaged through loops in the four needle-threads, which needle-thread loops depend from the underside of the work.` The looper-thread 6 passes through a thread-eye in plate 191, thence in a groove along the left hand side of looper 6a, through the eye at the forward end of said looper, thence aroundthe hookpoint or tooth 6b of the spreader 14. and thence upward througha loop in the needlesecure a plate 191 to t-he looper-carrier. In

thread 1 (held by looper 6a) to the Work.

Looper-thread 7 similarly passes through Aan eye in plate 191, thence along a groove l 5 (held by looper in the left hand side of looper 7a, through an eye near the point oil said looper, thence around hook-point 7b of spreader 14, and upward through a loop in needle-thread 2 7) to the work.- Similarly, the looper-thread 8 passes through an eye in the plate 191 along a groove in the left hand side oi' looper 8, through an eye near the point oi' said looper, thence around hookpoint 7b of spreader 14, and thence upward through a loop in needle-thread 3 (held by looper 8a) to the work. And in like manner the looper-thread 9 passes through an eye in plate 191 along a groove in the left hand side of looper 9, through an eye near the point of said looper, around the hook-point 9b of spreader 14 and thence upward through a loop in needle-thread (held by looper Salto the work.

As thus far described, the construction is substantially the same as that disclosed in the aforesaid Borton applicatiomexeept that in the latter the thread-eye of the second looper 7, with relation to the eyes in the other loopers, is farther back, from the looperl points. By this previous relative arrangement of the eyes the loop-spreader lll was enabled to so position the triangularlike spread-loops in the four looper-threads that each of saidloops would be penetrated' onlyby its proper two needles, this being essential to the formation of the underside of the particular seam which the mechanism is designed to make. This proper positioning of thetriangular loop in looper-thread 7, s that only the needles 2f* and 23a-and n'ot the needle la-pass into said loop, is accomplished in the machine oli' said Borton application by making the needlel 1a slightly 40 shorter than the other needles, and b, placingthe eye in looper 7a farther bac from l the point of said looper'than the eyes in the other loopers 6, 82t and 9a. It has been found, however, `that in this previous construction the loopsp`reader 14.-particu-larly its hook point 7b-sometimes lfails to catch .the looper-thread 7 with resulting defect in the seam.

The particular object of the present invention is to overcome the defect above mentioned. To this end the third looper 8 is notched on its upper edge near its point to form a tooth, projection, shoulder, or hook 10\(-Fig. 5) adapted by the movement of the loopers to be engaged with that portion f of looper-thread 7 extending from the eye of looper 7a to hook-point 7b and pull the same rearward so that the needle 1*" does not pass down into the loop in said thread 7.

In the position of the parts shown in Fig.

2 the tooth 10`has engaged thread 7 from looper 7a, and is beginning to pull it rearwardto. carry it under the shorter needle 1n. vAs shown in Fig. 4,"the tooth has pulled thread 7 farther to the rear, said thread at positi'on the thread extending from the the right-hand side of lo'oper 8a being drawn against the forward side of needle 2a which, with the needle 3, has descended into the loop of said thread 7. it the lett of looper 8 said looper thread 7 has been! drawn by .70 the toot-h or hook l0 to the rear dr back side of the slightly shorter needle 1a. By the provision ofA this tooth or hook on looper 8,

it is possible to move the eye of looper 7*1 farther forward than in the previous construction, whereby when at one stage of 'the operation the thread 7 passes from said e e lupward directly to the work it will be in 'such position that the loop-spreader le will not fail to catch said thread at the proper time to spread its loop.

`What claim is 1. In a sewing machine, the'combination of a needle, two thread-carrying loopers one l having thereon a hook or tooth adapted '2111"55 the movement of the loopers to engage the thread extending from the other looper to deflect its loop out et the path of said neeclflel` 2. 1n a sewing machine, the combination 90 of a needle, two loopers relatively xed but movable together, one of said loopers having thereon a hook or tooth adapted in the movement of the loopers to enfage and position, with relation to the needle, the thread, extending from the other looper which latter is a thread carrying. looper.

3. The combination of a plurality of needles and a plurality of loopers movable. together for cooperating with said needles, one of said looper-s having thereon a hook or 'tooth adapted in the movement of the loopers to engage and position the thmad extending from another looper with relation to the needles.

e. The combination of two loopere, and a cooperating loop-spreader, one et said loop, ers having thereon a hook or tooth adapted in the movement of theloopers to enga e and position the thread extending from t e other looper to the loop-spreader.

5. The combination of a plurality of needles, a plurality of loopers and'a loopspreader, one of said loopers having thereon a hook or tooth adapted in the movement of the loopers to engage the thread ertending from the other looper to the loopspreader and position said thread with relation to the needles. i

6. The combination of two relatively xixed loopers arranged side by side and movable together in similar paths, one of said loopers having thereon a hook or tooth adapted in the movement of the loopers to engage and other looper which latter is a thread-carrying looper.

l. The combination of a plurality of needles and a plurality of thread-carrying loo ers mn/able to ether and coperatne with said needles to project loops 'of their 'threads through loops of 4thread projected by the needles from one v-side ofthe seam,` and means for spreading said loops of looper threads into positionfto be entered by the needles, one of'said loopers having thereon a, hook or tooth adapted in the movement of the loopers to engage theloop of thread extending from' anothei'floope -end deflect saidloap;therebypreventing one `10 H; A. HAYWARD#` W. T. SIDDALL.

Copies of this patent Vmay be obtained for ve cents enen,4 by addressing the Gommissioner'oi Patents Washington, E.

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