US2128484A - Rug-making attachment for sewing machines - Google Patents

Description

J. D. KARLE Au 30, 1938. I

RUG MAKING ATTACHMENT FOR SEWING MACHINES Filed May 15, 1936 -2 Sheets-Sheet l Sumo/whom n D. Karla Aug. 30, 1938. J KARL: 2,128,484

RUG MAKING ATTACHMENT FOR SEWING MACHINES Filed May 15, 1936 2 Sheets-Sheet 2 Patented Aug. 30, 1938 RUG-MAKING ATTACHMENT MACHINES John D. Earle, Roselle Park,

The Singer Manufacturing Eon SEWING N. .L, assignor to Company, Elizabeth, N. 1., a corporation of New Jersey Application May 13, 1936, Serial No. 79,431

21 Claims.

This invention relates to sewing machine attachments for forming and presenting loops of a strand of yarn or the like to the needle of a sewing machine which stitches the looped yarn- 5 strand to a base fabric in the production of rugs and various decorative effects.

' In the U. S. patents of Heinrich Perkons No.

2,063,267, granted Dec. 8, 1936, and John D.

Karle, No. 2,049,395, granted Feb. 28, 1936, there I are disclosed attachments of the type in question, the product of which presents uncut loops. The present invention aims to sewing machine attachment which not only forms the yam-loops and presents them to the sewing I machine needle, but also cuts the loops to produce a smooth cut-pile eflect.-

With the above and other objects in view, as will hereinafter appear, the invention comprises the devices, combinations, and'arrangements of parts hereinafter set. forth and illustrated in the accompanying drawings of a preferred embodimentof the invention, from which the several features of the invention and the advantages at- .tained thereby will be readily understood by those skilled in the art.

In the accompanying drawings, Fig. 1 is a front elevation of a rug-making attachment embodying the invention. Fig. 2 is a left side elevation of the attachment, partly in section, with the sewing machine needle in its elevated position.

Fig. 3 is a similar view with the needle in its lowest position. Fig. 4 is a similar and fragmentary view of the rising needle,'yarn-looping member and loop-taking member at the time the latter is taking a loop from the yarn-looping member.

Fig. 5 is a top plan view of the attachment with the parts in the same respective positions shown in Figs. 1 and 2. Fig. 6 is a horizontal section through the needle-bar of Fig. 1 with the pivotal hearing of the segmental yarn-looping member in section. Fig. 7 is a section on the line 1-1, Fig. 1. Fig. 8 is a section on the line 88, Fig. 6, but with the needle-clamp in side elevation. Fig. 9 is a bottom plan view of the attachment.

Fig. 10 is a section on the line ill-40, Fig. 2,

with the segmental yarn-looping member omitted. Fig. 11 is a section on the line ll-l I, Fig. 3. Fig. 12 is a side elevation of the loop-taking member indepressed (dotted line) and raised (full line) positions relative to the yarn-looping member which is shown in section. Fig. 13 is a perspective view of the lower or work-engaging tread member of the attachment. Fig. 14 is a disassembled perspective view of the yielding two-part cutter-actuating lever. Fig. 15 is a section on the provide an improved line l5-l5, Fig. 1. Fig. 16 is a section on the line I 6l6, Fig. 2. Figs. 17-21, inclusive, are a plurality of similar views arranged in a series to show the cooperative relations of the needle,

yarn-looping member, and yarn-loop taking 5 member in the operation of the device. Fig. 22 is a section through the product of the attachment taken transversely of the direction of sewing', and-Fig; 23 is a similar view taken longitudinally of the direction of sewing. v

The invention, in the preferred embodiment ii lustrated, is applied to a conventional sewing machine having a needle-bar l, needle '2, presserbar 3, throat-plate l and feed-dog 5; the throatplate 4 having the usual needle-hole 6. 15

The attachment may comprise a supporting shank 1 which is detachably secured by the screw 8 to the presser-bar 3. The shank 1 carries the horizontal foot-portion 9-which is upturned at its 1 forward end to form the post ID. The foot-por- 20 tion 9 is formed with the needle-aperture ll Secured to the post III by the screw I2 is the shank l3 of the tread-member H which underlies and is spaced below the foot-portion 9 and has a lower work-engaging surface ii. The shank i3 is 25 steadied on the post ill by the lateral shank-ears l6, Fig. 16, which engage the opposite side-edges of thepost ill. The treadsinember M has an edge I] which is engaged by thebases of the previously stitched row l1, Fig. 17, of yarn-loops 30 and serves as a guide for the work.

The post l0 has journaled in its upper end the internally threaded fulcrum-stud l8, Fig. 6, which is fixed to the cross-bar IQ of the open segmental yarn-laying member the yarn-delivery aperture 2i and carrying a yarn-tensioning spring 22 such as disclosed in said Patent No. 2,049,395. A thin spacing washer 23 is interposed betweenthe post In and cross-bar l9, and a friction spring-washer 24 is interposed 40 between the post Ill and the head of the screw 25 which is screwe clinto the fulcrum-stud Ill.

The segmental member 20 works in the space between the jfOOt Sand the tread-member M in a transverse vertical plane closely path of the needle 2 and is actuated by the needle-bar l in the following manner. The conventional needle-clamping screw (not shown) is re placed by a special needle-clamping screw 28 having a long horizontally disposed cylindrical 50 portion slidably embraced by the spaced fingers 21, 28 of a U-shaped follower member 29 which is pivoted at 30 on the cross-bar [9 of the yarnlaying member 20. The follower, member 29 has at its upper end a stop-finger 8| which overlies 56 r I i 20 formed with 35 I in front of the 45 it and prevents the follower member 29 to the edge of the cross-bar user from applying the tion. The pivot-pin 8t has a head, Fig. 6, which projects into the space between the U of the U-shaped follower member and prevents accidental application of the latter upon the stud in a position 90 from the correct position. It will be understood that, through the described connection, the reciprocatory motion of themedie-bar i imparts an oscillatory motion to the segmental yarn-loopingmember 2d.

Cooperating with the yarn-looping member 20 is a yarn-loop taking and detaining member 33 which preferably constitutes the lower blade of a scissors device, the upper blade of which is indicated at St. The lower blade 33 is preferably formed at its free end with an upwardly and outwardly curved loop-taking point or finger 35 which extends forwardly beyond the free end of the upper scissors-blade 3d and terminates closely adjacent the rearward face of the segmental yarn-looping member 20 which has a short forwardly-ofiset portion 36 for a purpose to be described.

. The loop-taking blade 83 is fulcrumed for limited oscillatory movement on the reduced portion 37, Fig. 12, of the stud as. Fig. 11, fixed to and rotatively adjustable on the. rearward extension 39 of the attachment-supporting shank l.- The reduced portion 3'? of the stud he has two fiat sides as. of Fig. 12, and two circular arc portions ML The fulcrum hole in the blade 83 has two circular arc portions ti bearing upon the circular arc portions d0 of the fulcrum portion 31 of the stud 38. The arcs ii are enough longer than the arcs it to permit the loop-taking blade to oscillate between its depressed (dotted line) and elevated (full line) positions shown in Fig. 12. The spring 32, which is coiled about the stud t8 and anchored at one end in a hole 53 in .the

' shank-extension $9, biases the blade 33 in a direction toward its elevated or full line position, Fig. 12, at which it is stopped by the fiat sides 39, Fig. 12, of the fulcrum portion $1. The stud 38 may be rotatively adjusted to regulate the upper position of the yam-loop taking point 35.

The upper scissor-blade M is fulcrumed on the stud-screw dd, Fig. 11, coaxial with and screwed into the stud 38. The blade 36 is yieldingly pressed fiatwise against the blade 83 by means of the leaf-spring d5 means ,of the spring d6 which is coiled about the head of the stud-screw dd and anchored at one end in the screw-head-slot d'i. The rearwardly projecting tail-portions of the blades t3 and 3d are curved toward each other at st and d9, respectively, so that when the upper blade 36 has been depressed to closed-scissors position relative to the lower blade 83, the tail-portions d8, d9 of such blades are in contact and a further depression of the blade 313' causes the lower or looptaking blade 33' to move down from the position shown in Fig. 2 to that shown in Fig. 3.

Operative movements may be imparted to the scissor-blades by the needle-bar through an intermediate yielding lever system, as follows. crumed on the stud-pin 5d carried by the shank-' ear ti are a pair of levers t2, t8 having arcuate slots 55, Fig. l, engaged by the stop-pin 65. The lever 52 is formed between its ends with a lip 6%, Fig, It; which is disposed in the path of movement or the conventional new -clamp ti, Fig. 6, carried. by the needle-bar i. At its free end the lever b2 is formed witha horizontal lip to carry- -pressed position, Fig. 3. Lastly,

spring Gil yields as the needle-bar moves to the and is biased upwardly by- Fill-r .moves toward the mes es.

'ing a positioning pin 59 for the upper end of the coil-spring 60, the. lower'end of which spring engages the positioning pint! on the lip $2 at the free end of the lever 53. The lever 53 is formed at its upper edge with a stop-lip 63, Fig. 10, overhanging the lever 52 to prevent over-expansion of 'the levers '52, 53 under the expanding influence of the spring 60. The lever 53 bears upon the nose of the upper scissor-blade 34, as shown in Figs.

' 2 and 3, and the upward spring-pressure of the blade 36 produced by the spring 45 holds the levers b2, 53 in their raised positions limited by the stop-pin 55, Figs. 1 and 2. .The spring is preferably pre-loaded and is strong enough to hold the lovers 52, 53 against movement relative to one-another in their scissor-closing and scissor-depressing movement. In the downstroke of the needle-bar, the spring 46 yieldsflrst to permit the scissors to close. The spring 2 next yields to permit the .closed scissors to move to diethe pro-loaded end of its down-stroke.

It will be observed that the scissors device, in-

- eluding its loop-taking point or finger 35, is

spaced laterally of the line of sewing. This spacing determines the lengths of the yarn-loops formed by the attachment.

Secured to the shank extension 88 by means of the nut 65 is a thread and yarn cutter having a nose 65 which, together with the upper edge of the shank extension 39, forms a thread-receiving pocket at the bottom of which is'the cutting edge 66. This cutter is convenient for use in severing the thread and yarn in removing the work from the machine.

Operation Beginning at a point in the cycle when the needle is at the end of its up-stroke, Fig. 1, and the. segmental member 28 is at one extreme of its oscillatory movement, Fig. 17, as the needle descends, the segmental member moves to the left, Fig. l, and the feed-dog 5 feeds the work a stitchlength before the point of the needle enters the work. The motion of the segmental member 20 to the left from the extreme position shown in Fig. 17, slackens the length of yarn strand 64 between the loop-taking finger 35 and the yarn-delivery eye 2! andbows out a loop of yarn in position for seizure or entry'by the descending needle 2. The descending needle, which works close to the rear face of the segmental member 20, enters between the segmental member 20 to the left takes up the slack in the yarn strand, and, at the time the forwardly ofiset portion 36 of the segmental member reaches the loop-taking point 35, the scissors device has been fully closed to cut a previously formed loop 65, Fig. 19. The closed scissors device is then depressed to carry the finger 35 below the yam-strand 66' extending from the needle 2 to the yarn-delivery eye, Figs. 19 and 20. The forwardly ofiset portion 36 of the segmental member permits the yarn-strand 64' to be deflected forwardly and passed by the downwardly moving finger 35.

' As the needle rises, the segmental member right from the extreme position shown in Fig. 20, and throws out a yammoved the lever 52, Fig. 14, relative to the lever 53 and has compressed the spring between 4 resides in the inclination of the plane of action.

of the scissor-blades, as shown in Figs. 10 and 11. By proper selection of the degree of this inclination, the relative lengths of the cut limbs of the yarnloops may be proportioned to one another to secure an even top or cut surface 66 of the product, as shown in Fig. 22; the cut loops being shown secured to the base-fabric 61 by the lines of stitching 68.

The foregoing detailed description of the preferred embodiment of the invention is to be read in an illustrative sense and not in limitation of the invention, which latter is independent of the forms and relative arrangements of parts except in-so-far as such forms and relative arrangements are particularly pointed out in the appended claims in characterization of the inven tion.

The term"yarn" as used herein is intended to include any strand or cord or strip-like mavby said yarn-laying means at less than a stitch-length in terial.

Having thus set forth the nature of this invention, what I claim herein is:-

1. The combination with stitch-forming mechanism including a reciprocatory needle, of a yarn-- loop taker disposed at one side of said needle, means disposed a distance less than a stitchiength in advance of said needle to loop a yarnstrand back and forth between said needle and yam-loop taker, and means to sever only the yarn-loops taken'by the yarn-loop taker.

2. In a sewing machine, the combination with a reciprocatory needle and work-feeding means. of yarn-laying means movable transversely of the line of stitch-formation less than'a stitch-length in front of the needlepath to present loops of a yam-strand directly to said needle, means spaced laterally of the line of stitch-formation to detain yarn-loops presented adistance from said jlneedle, and means to sever said last mentioned oops.

3. In-a sewing machine, the combination with a reciprocatory needle and work-feeding means, 01' yarn-laying means movable transversely of the line of stitch-formation and disposed'a distance advance of the needle-path to present loops of a yarn-strand directly to said needle, and loop-severing means 1 spaced laterally of the line of stitch-formation and including a vibratory loop-severing blade supported in rear of said yam-laying means and having a yarn-loop taking finger at its 'forward end.

4. In a sewing machine, the combination with a reciprocatory needle and work-feeding means, of yarn-laying means movable transversely of the line of stitch-formation and disposed a distance less than a stitch-length in front 0! the needlepath to present loops of a yarn-strand to said needle, vibratory means spaced laterally o! the and disposed a distance operatively related to said yarn-laying member to seize, detain and-sever yarn-loops presented by the latter, and means to actuate said yarn-layingmember and said vibratory scissor-blade in timed relation to one another.

6. The combination with stitch-forming mechanism including a reciprocatory needle, and workfeeding mechanism of a yarn-laying member having a yarn-delivery eye and movable to -and-fro across the line ofstitch-formation in a plane disposed less than a stitch-length in advance of said needle so that the needle in its descent will pass between said yarn-laying member and the yarnstrand delivered through said'eye, means at one side of said needle to take yarn-loops presented by said yarn-laying member, and means to sever said loops.

7. In a sewing machine, the combination with an endwise reciprocatory needle, a feed-dog and a presser-foot, of a segmental yarn-laying blade adapted to oscillate in a vertical plane disposed less than a stitch-length in advance. of said needle, a scissors-device including coacting scissor-blades one of which is formed. with a loop taking point projecting forwardlyof the other blade and terminating closely in rear of said segmental blade, and means for oscillating the scissor-blade having the loop-taking point.

8. In a sewing machine, in combination, stitchforming mechanism including a reciprocatory needle-bar carrying a needle, work-feeding mechanism, yarn-laying means actuated by said needle-bar transversely of the line of stitch-formation in a path disposed less than a stitchlength in advance of said needle, a vibratory yarn-loop taker at one side of said needle, and

needle-bar-actuated means to operate said yarnloopv taker and cause the latter to dwell during the initial stage of movement of the yarn-laying means in throwing out a yarn loop for seizure by said yarn-loop taker. r

9. A rug-making attachment for sewing machines comprising a supporting member adapted for attachment to a conventional sewing machine presser-bar in lieu ofthe conventional sewing machine presser-foot, a tread member carried by said supporting member, a segmental yarn-laying member pivotally mounted on said supporting member'to oscillate in a vertical plane transversely of the direction of length of said tread member, a scissor-blade pivotally mounted on said supporting member andhaving a yarn-loop .seizing point terminating closely adjacent the plane of action of. said yarn-laying member.

10. A rug-making attachment for sewing machinesicomprising a supporting member adapted tor attachment to a conventional sewing machine presser-bar in lieu of the conventional sewing; machine Presser-toot. a tread member carried by said supporting member, a segmental yarn-laying member plvotally mounted on said supporting member to oscillate in a vertical plane transversely of the direction of length of said tread member, a scissor-blade plvotally mounted on said'supporting member and having a yarn-loop seizing point terminating closely adjacent the plane of action of said yarn=laying member. and yielding ber and having a yarn delivery eye, a vibratory scissor-blade pivotally carried by saidsupport in rear of said segmental member and terminating at its forward free end in aloop-seizing finger,

and a. second scissor-blade cooperating with said first mentioned blade to sever yarn-loops seized by said finger. I}

12. A rug-making attachment for sewing machines omprising, a supporting member having an attaching shank adapting it for attachment to a conventional sewing machine presser-bar, a tread member carried by said supporting member, a yarn-laying member carried by said supporting member, and a scissors-device pivotally mounted on said'supporting member in rear of said yarnlaying member, said scissors-device including a pair of scissor-blades both of which are movable relative to said supporting member and one of which is longer than the other and is formed with a loop-taking finger cooperatively related to said yarn-laying member. I

13. A rug-making attachment for sewing machines comprising, a supporting member having an attaching shank, a segmental yarn-laying member pivotally mounted on said supporting member to oscillate in avertical plane, said segmental member having a yarn-delivery eye and a forwardly oflset portion adjacent to said eye, and a loop-taking member mounted on said supporting member in rear of said segmental memloop-seizing point arranged to her and having a move up and down closely in rear of the ofiset portion of said segmental member.

1a. A rug-making attachment comprising a supporting member having a shank adapted to be secured to a conventional sewing machine press-' er-bar, a yarn-laying member adapted for actuation by the sewing machine needle-bar, a yarnloop taking and cutting device mounted on said supporting member, and yielding means for transmitting -to said'device motion received irom the sewing machine needle-bar, said yielding means comprising a pair of levers pivotally mounted on saiisupporting member and a spring. interposed between said levers.

"to 'a conventional said foot-portion 15. A rug-making attachment ior sewing machines comprising a supporting member having a foot portion and sewing machine presser-bar,

forward end and said shank-having a rearward a shank'adapted to be secured alternation by said yarn-looping member,

havinga post rising from its amasseextension, a yarn-laying member pivotally carried by said post, and a yarn-loop taker and cutter mounted on said rearward extension,

to a conventional sewing machine presser-bar,

said footportion having a post rising from its iorward end and'saidshank having a rearward extension, at yarn-laying member pivotally carried by said post, and a scissors-device mounted on said rearward extension and comprising a pair of pivoted blades one of which is formed with a,

yarn-loop taking point disposed closely adjacent said yarn-laying member.

17. A rug-making attachment for sewing machines comprising a supporting member having a shank adapted to be secured to a. conventional sewing machine presser-bar, a yarn laying membe! carried by said supporting member, and a scissors-device comprising a pair of blades pivoted on an axis inclined downwardly and laterally from said supporting member, one .of said blades having a yarn-loop taking point.

13. A rug-making attachment comprising a supporting member having a foot-portion and an attaching shank, a post rising from the front end of said foot-portion, a segmental yarn-laying member pivotally mounted on said. post, a vibratory yarn-loop taker pivoted in rear of said segmental member and having a forwardly extending loop-taking finger, and shear means for severing yarn-loops taken by said finger.

- 19. A rug-making attachment for sewing machines comprising a supporting member, a yarnlaying member pivotally carried by said supporting member, a scissors-device pivotally mounted on said supporting member and comprising a pair of blades one of which is formed with a yarnloop taking point disposed closely adjacent said yarn-laying member, a connection between said blades for transmitting motion from one to the otherand means to actuate one of said blades.

20. In a sewing machine, stitch-forming mechanism including a reciprocatorythread-carrying needle, 9. yarn-loop cutting device spaced laterally oisaid needle, and means to present loops of a yarn strand in positions for alternate seizure by said needle andcutting device. 1

21. In a sewing machine, the combination with i a yarn-looping member, of laterally separated threaded needle and non-threaded finger elements disposed close enough to said yarn-looping member to take yarn-loops presented thereto in means to sever the yarn-loops taken by said nonthreaded finger element.

JOHN I).

and i

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