US1704824A - Sewing machine - Google Patents

Description

March 12, 1929. G. J. DORMANDY SEWING MACHINE Filed June 27, 1925 3 Sheets$heet 1 INVENTOR.

March 12, 1929. 5, J no Y 1,704,824

SEWING MACHINE 3 Sheets-Sheet 2 Filed June 27, 1925 Kg .INVENTOR.

' ATTORNEYS March 12, 1929. DORMANDY 1,704,824

SEWING MACHINE Filed June 27, 1925 I5 Sheets-Sheet 5 IN V EN TOR.

- curves than the outside IXW.

Patented Mar. 12, 1929.

UITE S are GARRY J. DORMANDY, or TROY, NEW YORK, Asslenon T LION COLLAR & sense-s, mo, 0]? TROY, NEW YORK, A oonronamron new YORK.

SEWING MACHINE.

Application filed June 27. 1925.

This invention relates to a sewing machine by which a plurality oli rows oi stitches can be sewed siniultaneously. It relates more particularly to a. device of this sort in which one ot the needles can be started and stopped by the work at predetermined points with respect to the work. This invention is especially adapted to the sewing 01" two rows of stitches near the edges of work. such as, culls and collars, for example, although it is not restricted to this particular use. In sew ing parallel stitches near {h1- eilges of work, it is well known that the inside row oi? stitches is shorter on account of corners or For this icawhen corners nc son it is desirable that turned, the needle which sevvs the i w shortcr row oi stitches should cease operaiing, while the outside neetille is sewing the row of stitches near the corner.

By the present invention, means are put:- riiled by which one needle can beg n sew ing a row of stitches at the desired point, and another needle can be auloniaticai3y thrown into operation to begin sewing at predetermined dis ance from the edge ot-lhe work or cloth. The latter needle also caused to stop automatically at a predetermined )oint before the rear ed 'e of he work or cloth is reached. The operations oi starting and stopping the needle are controlled by the work itselt.

The, invention will be understood from the description in connection with the accompanying drawings, in which Fig. l 's a side View of a sewing machine showing the invention; Fig. 2 is a "front view of the same; Fig. 8 is a side elevation of an at tachment made in accordance with the invention; F in. at is a similar View from the other side; Fig. 5 is a section along the line aa of Fig. 4; Fig. 6 is a side view of a modification; Fig. 7 is a plan View of the same; Fig. 8 shows an article sewed in accordance with this invention and Fig. E) is a sectional View showing one oi the details of the machine.

In the drawings, reference character 1, indicates a sewing machine of the usual construction which is provided with a {split needle bar consisting of two halves 2 and 3, each carrying a needle at its lower end. These two halves 2 and 3 olf the needle bar e35 anism of the machine, in the usual way, so

Serial No. 39,888.

that one or both may be caused to sew in accordance with the desired conditions. A collar -l surrounds the bars 2 and 3 and a pin .3 passes through holes in the collar 4 and bars 2 and Z). is more clearly indirated in l "r The pin 5 carries a head (5 having a hole there-through, so that this head is adapted to slide up and down on the rod T. A stationary stop 8 is provided. with the upper end of which the head ti may be (urns-ed to come into contact. The rod T mounted upon a shaft 9 that is revolubie in bcariuos ll), set screw 11 holding the {till upon the shaft 2); A i-lf-li a m on the shalt 9 is conaa ilcl o\ oi the connection 13 to one arm oi ihe bell crank l t. which is nii' oted a! l?) to the machine, the other arm oi this bell crank heing connected to a sprin pressed rod lo having a compression spriii 1?" sail-rounding the lower end thereof an.i totaling to lorce the rol l6 upwardlv by l airing agai adjustable collar on lhi rod. The row It) carriean adjustable collar 18 upon which a bifurcated arm [1) pre This arm 19 is connected to the arms tin. of an clectro-magnct 21, which armature is pivoted at 22. An eXlehaicn 2 3 of the arnr l5) carries an adjustahlc stop 2% and a tension spring connects the lower end oi the extension 23 to a tixcd pin.

The two halves 2 and 3 of the needle bar carry th needles 2% and 27, resi iectivelv. These needles move up and down through holes in and il in the premier tool. (lli g: o). this presrcr toot being" capable of b ing: litic l temporarily by the lever 31 of tlic usual and well-known sort for the ins rtion of work. L-shapcd levers 53 and 34 are pivoted on the press? toot 30 at 35 and 36. These levers are provided at their upper ends with electrical contacts 37 and 38, that are insulated from the lovers. Springs 59 and on the prcsser foot 30 urge the levers 33 and 34 in a clockwis-le direction, as seen in Fig. 3. The lower arms of the levers 33 magnet 2t and to the other terminal l6, which is electrically connected to the other contacts 4-7 and A guide bar tor the work is shown at. 49 (Figs. 1 and G) and the rest plate or table for the work is shown at. 5t).

In the nimlitication shown in Figs. 6 and an insert (it) is flush with the rest plate for the work. A metal p ate (it is attached to out insulated t'roni the insert 60. This plate 61 is provided with lugs or projections (32, 65, the upper faces of which are flush with the upper face ot the insert 60. The other elements in this inodilication are similar to those tlll'ttltl described and are designated by the same referenre characters with primes. li. is, therefore, thought unneces sary to repeal. the oescription in detail.

For reznl understanding of the operation of the device. it should be kept in mind that only one needle, namely. the one operated i.'\ the bar 2, is operative initially, and it is onl after this needle has sewed a predelermino l distance from the edge of the cloth that the other needle begins to sew. Also as soon as the needle 26, operated by the bar 2. is within a certain distance of the rear cdy' oi the cloth. the other needle ceases to opt-rate. The needle 27 is caused to begin and to cea e operating in accordain-e with the progrt :s of the cloth or work. The principle that vs utilized to cause this result; to be accomplished that. as long either one of two electrical contacts are closed. the needle 2: is kept from operating. Vv'hen the StfiHH-Qf at the edge of the cloth is first begun, one of the contacts is closed and the other tillll so the needle 27 does not operate and alter the cloth has progressed a certain distance. both contacts are open, thereby permitting needle 27 to operate, and when the needle 26 has reached a predetern'iined position near the other edge of the cloth, the other contact is closed and the needle 27 ceases to operate.

The operation is as follows: As long as either contact between 37 and 47, or the con tact between 38 and 48 is closed (Fig. 3), a complete circuit will be closed from the bat-- tery 15, through the closed contact or contacts to the terminal 46, and through the magnet 21 back to the battery. This will energize the electro-inagnet 21, drawing down its armature 20 (F g. 2), together with the arm 19 which pulls the rod 16 downwardly, thereby turning the bel crank 14 (Fig. 1) and causlpg the connection 13 to turn the shaft 9, thereby pulling the rod T and pin 5 to the right. thus permitting tllo end of the pin to he pulled out of the hole in the bar 2 (Fig. 9) so that; the bar 2 wil slide with its tlat face in contact with the face of the bar 3 without moving the bar Also the head 6 of the pin 5 will rest upon the top end of the stop 8, thus preventing the bar 51 from operating, due to fact that the and 17 (Fig. 2) cause the bell *l to he turned clockwise (Fig. 1) by means or" rod 16, thus turning the rod 7 to the left and (run the pin 5 to project into ill" bar 2. as sow-i us this hole in 5, and its head ti to more out w. the stop 8, so both bars 2 ing the needles ind 27 will be weihrr. The in 3t 21 is dc-eir w its ilt' as will be underan inspection ot' Fig. 3. As the res toward the left in this figure. itts forward edge raises the member 43. hus turnii'ig the lever 23-; on the pivot 35 and openi' the con its 37, li. As soon as the ward edge f .ie c oth reaches the needle this needle be; us to sew its row of hes, whil the needle 27 is idle. When forward ezl ol the work reaches the this nwmber is likewise raised with t ns turning the lever 51" on its :11 the contacts 38, t8 and he r-Preuit ihrough the magnet 21. as this circuit is broken, the needle '1 inio operation as above described, needles continue to sew until the is again energized. This magnet become z orgized as so n as the rear a ye oi? the rlo h passes out from under the lihlltlJtt til. thus ierinitting the spring 31 1o ii ii e lr'rer I52 and close. the contacts 3%. 4i. .is son as this contact is eiosed. the magnet it is energizrd and the needle 27 i: stopped from operating. as abin'e descrilied. it will be understood that the distance that the, needle sews before the needle 27 bewill be determined by the disthe hole in rein-he the of the we" :Hnl 3 (1:11

, rated E i i [1) SUV;

From the hole 21 in which thr needle 2t; norks: to the bottom edge of the member it, and the distance from the rear edge of the cloth at which the needle 27 stops sewing will depend upon the distance from the hole 28 throu; -;h which the needle 26 works to the underside of the member The members 4 t and l are made adjustable so that the ptillilf; :li which the needle 2? begins and ceases oprrating can be varied.

in the. modification shown in Figs. (3 and the peration is similar to that already .lilvl lfitl. This modification. is especially wei'ul in cases where the cloth is so thin that: he levers 33 and 3st of Fig. 3 would not; be .nrnert sutliri .Zitly to open the contacts with ainty. in this n'ioditication the cloth itself breaks the circuit by moving between the l wer ends or toes oi the members 43', i4 and the pro er A KT e be ne dle 27 will be prwentd from operating. As soon as the forward edge of ltld the cloth has proceeded sufiiciently far to open both these contacts, the magnet 21 will be ole-energized and the needle 27 will begin to sew, and as soon is the rear edge of the cloth has passed 'l'tOHl between the contacts 43 and G2, the magnet 2t will be energized and the needle 27 will cease to sew.

The sort of results that can be obtained by this invention can be understood from Fig. 8 in which the end of a collar sewed by this device is shown. Assuming that the two rows of stitches were sewed in the direction of the arrow B, one can see that the left hand row was sewed by the needle 20 and the right hand row by the needle 27. As soon as the edge 70 passed out troni under the member 43, the needle 27 stopped automatically at the point 71 and the needle 26 continued to the point 7H where it was stopped by the operator in the regular way. \Vhen the cor ner was turned and the needle 26 continued to sew in the directioi'i of the arrow 5', the needle 27 did not begin again until the point Tl was reached by it. the needle being caused to begin again by the edge 73 passing under the member 44. The two rows cl parallel stitches illustrated in the lower portion of Fig. 8 were sewed in the direction of the arrows S", in a manner similar to that already described.

I claim:

1. In a device for sewing a plurality of Wu s of stitches, a needle for each row ot stitches, and means operated by the work to cause one ot' said needles to begin sewing, when another needle has sewed a distance approximately equal to the distance between two needles, said first named needle being inactive while the work is absent.

2. In a device for sewing a plurality of rows of stitches, a needle for each row of stitches, and means operated by the Work to cause one of said needles to begin sewing alter another one has sewed a predetermined distance and to cause it to cease sewing at a predetermined distance from the edge ot the work. said needle lwlllg inactive while the work is absent.

3. In a device tor sewing rows of stitches, needles operated from a common source, and means operated by the work to start one of needles after the work has advanced and then been sewed a predetermined distance by the other needle, said first named needle be ng? inactive while the work is ab-ent.

4. In a device for sewing; rows of stitches. irsedles: operatea, tron] a common source, and means operated by the work to start one of said needles after the Work has advanced a predetermined distance from one edge of the work and to stop it before the other edge of the work has been reached by said needle, said needle being inactive while the work is absent,

In a device For sewing rows of stitches. needles operated from a common source, and means including: an electro-magnet operated by the advancing edge of the work to start one ot' said needles to sewing and by the receding: edge to stop it.

(3. In a dewice for sewing rows of stitches, needles operated from a conunon source, one of said needles being continuously operated and another intermittently operated. and means including an electro-magneti operated by the advancing edge of the work to start said intrrl'nittcntly operated needle to sewing and by the receding edge to stop it.

lAR'RY J. DORMANDY.

Ht; id

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