US1003176A - Sewing-machine. - Google Patents

Description

E. ERICKSON.

SEWING MACHINE. APPLIOATION FILED 111111.21, 1910.

Patented sept. 12: 1911.

2 SHEETS-SHEET l.

Jut/erg* 4,

E. ERICKSON.

SEWING MACHINE.

APPLICATION FILED MAR,21, 1910.

A1,l)()3,1'4`f6. Patented sepfn 12,1911.

2 SHEETSwSHEET 2.

v UNrr-ED STATES PATENT onirica.il

EDWARD ERICKSON, F LYNN, MASSACHSETTS, ASSIGNOB '10 LAWRENCE E. JOHNSON, OF WIN THROP, MASSACHUSETTS.

SEWING-MACHINE.

To all whom. it may concern:

Be it known that I, EDWARD ERICKSON, a subject of the King of Sweden, and'a resident of Lynn, county of Essex, and State of Massachusetts, have invented an)Imp rove ment in Sewing-Machines, of which the following description, in connectionlwith the accompanying drawing, is a specification, like characters on the drawing representing like parts.

This invention relates to sewing machines and particularly to a novel mechanism for drawing oil from the thread supply a measured quantity of thread of the required length to make the stitc The invention is shown as it would be used in connection with a sewing machine of the type illustrated in my' co-pending application- Se. No. 532,602, filed December 4,1909. Y

Referring to the drawin s, Figurel is a Vside view `ofa machine simi ar to that shown in my above-mentioned. co-'pending application; Figs. 2 and 3 are detail views of the presser-foot-lifting mechanism and threadmeasuring device showing the. parts indifferent positions; Fig. 4 is an end view of the construct-ion shown in Figs. 2 and 3.

Since the' machine herein illustrated' is similar to that shown and described fully in my co-pending application, I do not regard it as necessary to describe the machine in detail. It will sulice to say that the work 9 to be sewed'is sustained by a work rest- 10 and is held in position by a ypresser-foot 1Q which is mounted for .lateral movement on two pins' 13 thatl arecarried by a rising` and falling bar 1'5 by which the presser-foot is lifted at appropriate times by the mechanism hereinafter'described. The needle is shown at 20 and the awl at 26. The sewing machine is of that type wherein the loop of' threadis removed from the needle after it has been drawn through vthe work and is carried over a stationary shuttle 51, thereby to form the lock stitch. 'The stitching mechanism for accomplishing this object is fujlly described in my co-pending application Se. No.'53L-602 andas the present invention is not concerned with it, I do not deem it necessary to further illustrate or describe it herein. ..For further particulars as to the operation of these parts, reference maybe had to -said co-pending application. y'.llhe

thread leading` from the source!v of supply Specification of Letters Patent.

Application led March 21,1910. Serial No.y

'shown in 'Fig 3.

Patented, sept. 12', 1-91 1. 550,582.

passes under a thread clamp 96, thence through the thread-measuring device, which will 4be more fully hereinafter described, around a direction roll`33 and into the waxy pot 340, and from the latter around a teni sion device 350 and over a direction roll 360 toa take-up roll 370, from whence it passes to the .looper mechanism, all as described in said application.

In the operation of the stitching mechanism, the work is fed by the awl when the latter is therein, and for this purpose the awl has a lateral movement as well as its movement toward and from the work. The presser-foot 12' has a lateral movement with the awl and during the time that the awl moves to feed the work, said presser-foot is in engagement with the work, but after the awl has been retracted and the' needle has entered the work, then the resser-foot is elevated and is returned to its As stated above, the lateral movement of the presser-foot while the work is 'being fed `is permittedA byV reason of the fact that the presser-footlis slidably mounted on the Apins 13 that are carried b f the upper end of the bar 15. The verticall movement of the presser foot may be secured by any suitable I nechanism.v As herein shown saidI bar 15 has pivoted thereon a pinion 30'which has rigid therewith a segmental beveledA gear 31. This gear 31 meshes with a beveled pinion 32 that-is fast on a shaft 33 that is journaled in bearings 34 carried bythe bar 15. Said shaft 3 3 has thereon a worm '35 .which meshes with a worm-gear 36 journaled on a stud 37 carried by the bar and provided with an arm 38 which has a slot or -notch y39 inone end. f

133 designates `an elbowflever which is pivoted to the frame at 134 and which carries at one end a roll adapted to be engaged by a cam 135 on a cam shaft 5. Pivoted to` the other arm of said lever 133 at 136 is a lever 47 which is provided with rack teeeth 48 that are adapted to mesh with the pinion 30. Said lever 47 is also'iprovided with a pin or projection 49 that is adapted to enter the slot or notch 39. The lever 47 is acted on by a suitable spring 141 which tends to keep it in the position shown in Figs. 1 and 2, and a cam 140 situatedonthe cam shaft. 5 isada-pted to engage said 4lever at the proper time and throw into the position initial position.`

the notch 39 in alinement with thepin The bar has pivoted to its upper' end as i at 18 a lever 16 which is also pivoted to the rack 4,8thus'turning the gear wheel 31,

and the latter will. through the gear 32 rotate the worm 35 and thus turn the wormgear 36 andthe lever 38. Since the lever 133 is pivoted to the frame, it will be understood that the rack 48 has no vertical movement. Theparts are so designed. that as the bar 15 rises or falls, the gear 36` and arm 38 will be turned so as to always keep 49.' At the appropriate. time in the cycle of the stitching operatiomthe presser-foot has to be lifted, and at such time the4 cam 140 first engages the lever 47' and throws it'k .into the position shown in Fig. 3 with the pin 49 in the notch 39 and the rack 48 out of engagement withfthe pinion 30,

` and-while the lever .is held in this position4 the cam 135y engages the lever 133 -and throws Vthe vertical arm of the same l arm of the lever lifts the bar V15 by reas 35 laterally so' as to elevate the horizontal arm. This 'movement of the horizontal Son of the' fact that said lever is locked to the bar through the pin 49 and slot 39. Af-

,ter the cams have passed out from-engagement with said'levers, the'presser-oot is ahm lowed to'lescend either byits own weight or `by suitable spring mechanism as desired. It

'Hthubesseen that while the resserffdbtis normally/fires to.be raised or lowv ered to Isuit the thicknessrifhegwork be- ;f ing operated on, yet at the appropria are Ain the-@cycle of operations, the mechanism for` operating the presser-foot comes into play and-hits it. 'The presser'foot is normally held against the'work by a spring 150. l

Ingthe present invention the bar 15 not lonly acts as a means for elevating the presser-foot, but also constitutes part of the l thread-measuring; device.

In machines of thischaraetenitais customary to provide yQmea'ns wherebyf-a'freshfquantity of thread f suiiicientr for thenext stitch is drawn off 4iromthe''source oflsupply immediately after thepreviously-formed ,stitch has been set, and in the' present'embodiment this threadmeasuringj device is associated with the bar y15.". As herein Shown, the lower end ofthe jgbarj'is formed' with' a recess 100 in whicli is y received oneend ot a thread measurer 101.

Said bar 151is provided'vwith eyes orrpassagef wa 's 102 throughv lwhichI the thread 104 will engage the thread and will draw of from the source of supply or measure a length'of thread sufficient for the next stitch, it being understood, of course, that during this operation of measuring the thread the thread clamp 96 will be released. The amount of thread which is drawn oil or measured will obviously depend on the amount of relative movement between the thread measurer 101 and the bar 15. rl`he thread measurer 101 is connected to an elbow-lever 105 pivoted to the frame at 106 and operated by a suitable cam 107 0n the cam shaft. lA spring .108 surrounding the lower end of the thread measurer serves to keep the lever 105 in engagement with the cam. The thread measurer will thus at the appropriate time have a definite downward movement. The amount of thread which is drawn oit' during such movement will depend upon the position of the bar 15 when `.the thread vmeasurer is in its lowest position,

and this, of course, will depend upon the thilmess of the work. If a very thick piece of wuk is being sewed, the bar will, of course, be sltuated at a higher point relative the thread measurer than when a' thin 'piee of work is being sewed and therefore the amount of thread which is drawn oil' at each movement ofthe thread measurer will have a direct relation to the thickness of the r r lHaving fully described my invention, what I claim'as new and desire to secure by Letters Patent is 1. In a sewing machinethe combination with a presser foot and a bar carrying' the -same and provided with a recess in itsfend and two thread-receiving eyes either side/.of

ythe recess and means acting onthe bai` to elevatethe presser foot, of meansv situated within and guided by said recess andfco- .operating with said bar to measure 'a length ofthread for the nextsucceeding stitch.

an the upperend'ofthe thread-.measurer is. In a sewing-machine, ther combination 13 vating said bar, which means' permit the presser foot to be raised independently thereof at a certain point in the cycle of operations, said bar having a' recess in its end and eyes for the thread either side of the recess, a thread-measuring device lsituated within the recess, and means to move the thread-measuring device relative to the bar thereby to cause 1t to measure off a length of thread for the next stitch.

vand eyes for the thread either side of the recess, a thread-measuring device situated "within the recess, land means to give the thread-measuring device a uniform reciproeating movement 'whereby more or less thread will be measured depending on the position of the bari,

4:., In a sewing machine, the combination with a presser foot, of a bar connected thereto and movable therewith, said bar having a recess in its end, a thread-measurer in the recess and guided thereby, and means to reciprocate the thread-measurer.

5. In a sewing machine, the combination with a presser foot, of a bar connected thereto and movable therewith and having a recess extending longitudinally thereof and also provided with thread-receiving eyes either side 'of the recess, a thread-measurer located within the recess and provided with a slot through which the thread passes and also having a thread-measuring finger occupying said slot, and means to reciprocate the thread-measurer in the recess to cause the finger to engage the thread between the thread-receiving e es. i

In testimony w ereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

yEDWARD ERICKSON.

Witnesses:

Loms (LSMITH, THOMAS J. DRUMMOND.

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