US1445956A - Multiple-needle hemstitching mechanism - Google Patents

Description

Feb. 20, 1923. 1,445,956; H. A. JACOBS ET AL. I

MULTIPLE NEEDLQHEMSIITCHING MECHANISM. I

HLEbNOV. 24, 1920- 4 SHEETSSHEET-l.

jaywez'mi aomga Feb; 20, 1923. 1,445,956. H. A. JACOBS ET AL.

MULTIPLE NEEDLE HEMSTITCHING MECHANISM.

FILED Nov. 24. 1920. 4 SHEETS-SHEET 2..

Fb. 20, 1923. 1,445,956. H A. JACOBS ET AL.

MULTIPLE NEEDLE HEMSTITCHING MECHANISM.

FILED NOV. 24' 1920. 4 HEETSSHEET 3.

Feb. 20, 1923; H. A. JACOBS ET AL.

MULTIPLE NEEDLE HEMSTITCHING MECHANISM.

4 SHEETS*SHEET 4.

FILED NOV. 24, 1920.

In: mmmm v II-film Patented Feb. 2G, i923.

hi i "l" HUGH A. moons AND ciinaiins 'J'ACOBS, or ainvn-EAronis, INNESO A.

MULTIPLE-NEEDLE nnns'rrrcnine MECHANISM;

Application m November 24, 19,20. Serial No. 4.26.266.- i 1 I To all whom it may concern: 7

Be it known that we, HUGH A. Jnoons and Gin-nuns l l. Jnoons, citizens of the United States, residing at Minneapolis, in the county of Hcnnepin and State of Minnesota, have invented certain new and useful Improvements .in lvilultipldNeedle ileinstitching Mechanism, and we do hereby declare the following to be a full, clear, andexact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

Jur invention has for its object to provide an extremely simple and highly ellicient hemstitching attachment or mechanism for sewing machines and more particularly for sewing machines of the rotary shuttle or rotary hook type.

Hitherto, hemstitching of special character has been done by expensive sewing machine mechanism, which, because of the expense was not adapted for domestic use. Our hemstitching attachment or device is adapted to be applied either at the factory or upon machines already in use at comparatively small cost, and, at the same time, will be highly elhcient for the purposes had in new to enlarge and properly shape holes pie viously made by one ofthe needles. ,The two needles are arranged to throw interlapping thread loops, that is, the thread loop from each needle will be thrown laterally toward the other needle, so that, in a direction transversely of the feed movement, there willbe a lapping or interlapping of these thread loops, the one beyond the other, The rotary hookis arranged to pass through these two thread loops from the .two needles and to carryfthe same around the third thread that comes from the shuttle, thereby forming athree-thread stitch in which twooutside threads, supplied from the two needles, will be interlocked with and connected, by said third threadthat comes from the shuttle or bobbin.

The preferred embodiment of the inven tion is illustrated in the accompanying drawings, wherein like characters indicate like parts throughout the several views.

In the preferred embodiment of the in 'pass between the two needles preSentlytobe Referring to thedrawings: A

Fig. l is aside elevation showing-a sew, ing machine of the rotary shuttletype having our attachment or hemstitching-device applied thereto, y p Fig. 2 is a front elevation of the'machinc shown in Fig.1; I I j Fig. 3 is a YltfiVlJitlllly in side elevat on, but with some parts sectioned on the line 33 of Fig.2;

Fig. 4; is a fragmentary .planviewshowing the needle plate and certain associated parts; Fig. 5' is a perspective showing the need les, piercer, presses foot, needle plate and feed teeth of the machine; I y 1. ,i

Fig.6 is a view partly in front elevation but with some parts sectioned on theirregular line 6 -6 ofFig. 3;.

'Fig.

l is a view-corresponding to Fig. 8,

v Fig. '9 is a plan view illustrating the Lem but with the shuttle andthook in full ele- 1 Fig. 10 is an enlarged View showing the manner in which the three threads are 1nstitching structure; and, 8

terlocked to form the stitch.

Of. the parts of the sewing machine,.,it]is desirable, for the purposes ofthis case,:only

to particularly note the bed plate 11, the head arm 12, theface plate 13, the needle bar .14, the presser foot b31 15, the presserv foot. y

16, the thread take-up arm l7, the thread.

tension device 18, the main-driving shaft19,

the shuttle driving forked' or two-pronged pinion 20 and the rotary shuttle 2 1, all of which parts are of :well known construction and operate. in -a manner. well understood:

This. ro-

by. those familiar with thisv art tary shuttle 21, as is customary, s set to roe. tate on an oblique axis within the customary shuttle race. 22, and 'said shuttle has d1ametrically oppositeseats .23 with which the prongs of the driving fork or pin-ion. 20-engage through ,the lowerl-ialf rotation The shuttle 21 containsjthecustomary bobbin and I bobbin case 24, and the bobbin c'ase has the customary cover 25,,wh1ch latter-noted parts 1 also operate in a-well known manner. Moreover, the rotary shutt1e21 has a peripheral hook 21 which, ill-z this instance, 1s made very thin or-narrow and is arranged to described,

Below the presser foot 16, the needle plate 17 is shown as provided with a raised portion 17 that is formed with two perforations 26 and 27, and the presser foot 16, as shown, is provided with perforations 28 and 29 that overlie, respectively, said perforations 26' and 27. The numeral 30 indicates the feed teeth that work through the needle plate in the usual way.

As already indicated, our invention contemplates the use of a plurality of needles, and preferably also, a co-operating piercer. These two needles 31 andBZ and the piercer 33 are all preferably rigidly secured to and depend from a common head 34 having a shank 35 adapted to be secured to the lower end of the needle bar 14 by the customary clamping head 1a.

The piercer 33 is located directly behind the needle 81 and is so spaced therefrom that it will always come into a needle hole justback of the hole occupied and, in fact, primarily made by said needle 31. The function of this piercer 33 is to enlarge and to better form the hole in the cloth and, hence, said piercer, at least in its upper portion, would preferably be approximately rectangular in cross section, inasmuch as that is the form of hole ultimately desired in hemstitching.

The two needles, 31 and 32 are passed through the holes 28 and 26 of the presser foot 16 and needle plate, respectively, while the piercer 33 is passed through the holes 29 and 27. Threads a and b are supplied respectively to the needles 31 and 32. These threads, as shown, are supplied from spools 36 and 37 mounted on the head arm'12 and said two threads are passed through suitable guides 38, through the tension device 18, through the slack take-up arm 17 and through suitable guides 39 in the needle bar clamp 1 1 The lower or third thread. carried by the bobbin 2 1 is indicated by the character 0, that is manipulated in substantially the customary way under rotation of the shuttle;

. but in this arrangement, the hook of the shuttle passes through the interlapped, loops of the spool threads (4 and b, and, hence, both of the threads a and Z) are turned about said lower thread 0 and the three threads bei come, interlocked, as best shown in Fig. 10.

Here it will be noted that the lock or third thread 0 1s alternately interlocked with the threads 0; and b. Preferably,"the thread a is fed under greater tension than the thread 6., so that when the thread 0 is drawn taut, the thread I) will be pulled laterally toward the thread a; The thread I) will be stitched in thebody of the cloth'y, see particularly F1g.,9,while the thread a will be stitched into the holes 3 which are made as a part of the hemstitching and are finally formed for double hemstitching, the stitching operation must be repeated on both sides. For example, in Fig. 9, single hemstltchingat the right is shown as completed, but double hemstitching at the right and left is not fully completed in said view, Fig. 9.

Obviously, very high'grade hemstitching may be done by this attachment, especially when the stitching operation is repeated on both sides of the'row of perforations. The

manner of forming the stitches in the perforations and in the body of the cloth alongthe line of perforations and of drawing the threads in'the stitching operation, not only definitely forms the hemstitch but provides a hemstitch that will keep its form after it has been made.-

The fact that the needles are all on a common head is highly important because they can be made in exact proper adjustment and cannot thereafter get out of adjustment, and, moreover, may be handled as a single unit.

lVhat we claim is;

1. In a sewing machine. the combination with two needles adjacently connected for simultaneous movements, a shuttle mecha nism including a hook-acting member ar= ranged to pass between said needles and through overlapped thread loops projected from the several needles and to carry said thread loops around the thread from the shuttle mechanism, and a piercer movable with said needles, one of said needles and said piercer being spaced in the line of the feed movement, and one thereof being arranged to enter holes formed by the other.

' In a sewing machine, the combination with twoneedles adiacently connected for simultaneous movements, shuttle mechanism including a rotary hook arranged to pass between the said needles and through overlapped thread loops projected ,from the several needles and to carry said thread loops around the thread; from the shuttle, and a piercer movable into the holes formed byone of the needles and serving to enlargeand complete the formation of. the holes.

3. Two sewing machine needles and a piercer connected to a having a common stem, said piercer being located directly beyondone of said needles and positioned so that it will enterholes common head andprimarily formed by said needle located in front thereof. In testimony whereof natures.

. HUGH A. JACOBS.

CHARLES E; JACOBS.

they aiiix their sig-

Images