US922048A - Sewing-machine. - Google Patents

Description

' Patented May 18,1909.

8 BHBETE-BHBBT 1,

THE NORRIS r'E-rsns co umsumcron, n. c.

V. SANDAHL.

SEWING MACHINE.

APPLICATION FILED SEPT. 28, 1907,

Patented May 18, 1909.

- BSHEBTB-SBEET 2.

V. SANDAHL.

SEWING MAGHINE.

APPLICATION FILED SEPT. 28, 1907.

Patented May 18, 1909. 3 SHEETS-SHEET 3..

1n: NORRIS PEfERS ca., mlsnmamn, a c4 "UNTTED STATS ATN OFFTQE.

VICTOR SANDAHL, OF NEW YORK, N; Y., ASSIGNOR TO L. WHEELER BEECHER, OF NEW HAVEN, CONNECTICUT.

SEWING-MACHINE.

Specification of Letters Patent.

Application filed September 28, 1907.

Patented May 18, 1909.

Serial No. 395,039.

To all whom it may concern.-

Be it known that I, VIcroR SANDAHL, a citizen of the United States, residing at New York, borough of Brooklyn, in the county of Kings and State of New York, have invented a new and useful Improvement in Sewing- Machines; and I do hereby declare the following, when taken in connection with the ac companying drawings and the numerals of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitute part of this specification, and represent, in

Figure 1 a front view of a sewing machine constructed in accordance with my invention. Fig. 2 a top or plan view of the same. Fig. 3 a side view, a portion of the frame broken away.

This invention relates to an improvement in sewing machines, and particularly to machines for stitching outer soles of boots and shoes to welts, the form of the machine being known as loclvstitch, and comprising a needle and shuttle mechanism, the special object of the invention being to improve the thread controlling mechanism so that the machine is automaticallyadapted to stitch soles of varying thickness; and the invention consists in the construction and combina tions of parts as will be hereinafter described and particularly recited in the claims.

As in the usual construction of machines of this class the main shaft 2 is mounted in uprights 3 springing from a base 4 the shaft being driven through the usual driving Wheel 5. The shuttle carrier 6 is of usual construction mounted in a housing 7 and rotated by a rack 8 the mechanism for driving this shuttle and moving the needle 9 and awl 47 being those of usual construction, and not requiring further description, the parts all being moved through various racks and cams operating by the driving shaft 2. The work is placed between a support 10 and a presser foot 11. This presser foot mounted u on a pivot 12 has a tail 13 to which is attac ed a presser foot connecting rod 14 which extends rearward and is pivotally connected with a thread-measuring adjusting lever 15, this lever being mounted to turn upon a shaft 16, the thread 17 coming over the needle, passes over the usual take-up mechanism and extending rearward passes around a guide roller 40 in the end of the lever 18, thence over a guide 19 and rearward between the thread clamp 20 and a roller 21 on a shaft 22, the thread clamp being carried. by an arm 41 which extends around the frame and is mounted on a bearing 42 and is turned by an arm 43 which extends into engagement with a cam 44 whereby the thread may be held at this point when the stitch is made. The thread measuring lever 18 is mounted upon and fixed to a shaft 23 and carries a roller 24 which is engaged by a cam 25 whereby the lever is rocked. Mounted upon and fixed to the shaft 23 are a series of pawls 26 adapted to engage with teeth 27 on the upper end of the thread measuring adjusting lever 15.

Mounted u on the shaft 22 is a pawl lifting lever 29 raving a rearwardly extending arm 30 which is moved by a cam on the driving shaft 2. The lever 29 is also provided with a downwardly extending arm 31 which is engaged by a spring 32. The upper end of the lever 29 has a transversely arranged finger 33 by which the pawls 26 are lifted out of engagement with the teeth 27, these pawls being held downward by means of springs 34 which are connected With a stationary bar 35. The arm 30 of the pawllifting lever is provided with a tail-piece 36 which is connected by a spiral spring 37 with a lug 33 on the lower end of the thread measuring adjusting lever 15 so as to normally depress the presser-foot. The spring 3'7 is lighter than the spring 32 so that the pressure of the spring 32 will overcome the pressure of the spring 37 on the lever 30. The spring 37 is so arranged that the tension of the spring varies with the position of the lever 15. The thicker the sole is the more the spring must yield and a heavier tension will be imparted to the presser foot. The spring 37 is also placed between the levers 15 and 30 so that the tension of the spring will be increased and decreased by the movement of the lever 30, the greatest tension being applied when the lever is operated b its cam to permit the pawls to engage the liever 15 which are timed to do so just after the stock has come to rest before a stitch is made. When the pawls are raised by the lever just before the feeding of the stock, the spring is shortened and a lesser pressure is applied to the resser foot. B this arrangement it wil be seen that a light pres sure is on the sole when fed along and a heavier pressure-isappliedafter the sole'has come to rest and the presser foot will be lockedwith he avier pressures on: the-sole.

In the lower end of the thread-measuring: lever 18 is a stop screw 39which bears against the thread-measuring adjusting lever= 1'5at the inward stroke of the lever. The threadentering ,theem'achinez-irom the spool.=.passin:g. between the roller 21 and clamp 20 overthe guide 19 and around the guide roll tO' at the end ofthe thread-measuring lever 18, thence forward' to" the needle heneath the clamp 45 1 by" which it is held' against the grooved thread wheel 46, the: tension of" the thread beyond this point being o't usual' construe tion: The clamp 45? is carried by a bell crank'lever" LS'adaptedtobe turned by a cam .on the main shaft: Atapredetermined time the thread is held byxthesclamp 45 and the" lever" 18" is turned by its cam' so as to throw its lower end carrying the roller 40' rearward which in turn" draws the thread heneathtthei threadclamp '20 from the spool. The thickness of the. sole determines the length ofithread :to be drawn from the spool. The. sole is" placed 1 onthe support and the presser-foot' restsupon it, and as the thicknesses'otthesolesvary the presser -ioot is raised" and. lowered. accordin ly: As the priesserfootzis raisedlor'lowere the lever 15 will hemovedaccordingly by the connecting rod 14. Before a" stitch is takentheawlia'i" punches the'sole and-the resser-foot is held so as not tobe lifted b'y the awlb'ytlieene gagement. of the pawls 26 :with-the teeth 27; Afterrtlie' awlhas punched the' hole and before it is withdrawn, the pawl 26 will be lifted out. of engagement with the teeth 27'' so that the lever'15'is free to turn, and'so as topermit' the feeding'ot the soleby the awl iii-the usual way. At the time t'hestitchis taken the threadfrom the spoolis-held by the clamp 20and it the sole'increases'in' thick 'ness' more thread is" required; and a thicker sole raises the presser-foot which draws the connecting" rod" 14 moving the lever;15" forward,' and 'ifthe' lever-r15 moves iorwardit allows. the lower end ofthe' threadmeasuring lever" 18 to swingforward to a greater-extentbeforethe stop screw 39 engages: with the lever15 so that when it returns a greater lengthof thread will he drawn from the" spool. The de th to which the thread "is pulled into these e may be adjusted bythe stop'screw '39: Atthe time the drawingofthe" thread from the spooltakes place, the thread clamp 20"is raisedland the clamp 45 brought into action to holdthe'threadf Onthe'other hand, a thinnersole moves the connecting ro d. 14 rearward "and hence moves the thread measuring adjusting? lever 15" rearwar'dso that thestop screw 39 in the lever'18 will strike the lever 15 at" an earlier point .inithe operation ofthe' machine" so that its return movement is not so" great, and

I therefore aless amount otthreadis drawn.- The spring 32 holds the cam roll carried by' 1t?1S stronger than the spring 37 it overcomes the influence of the spring 37 on the arm 30. IfIthinne-r stock is being sewed the lever 15 will be turned rearward to a greater extent therebydiminishing the tension on the spring 37 and thence the. pressure of the presserfoot; on the other hand, thicker stock turns the lever 15 forward, increases the tension pressure at the presser-loot I claim:'

1. In a sewing-machine, the comhination j w th a presser'foot, of a'spring appl-ylng ten- S1OIIJDO the presser foot, mechamsmto lock with :said mechanism and operated 5 thereby,

varied, substantially asdescribed.

ingrea-rward therefrom,- a thread measuring ad ustinglever connected with the connect teeth, athread measuring lever, pawlsopersaidt'eeth, and means for lifting said pawls out of engagement with said teeth.

adjusting lever conncctedfw-ith theconnectteeth, a thread measuring lever, pawls adapted'to-be'moved thereby and adaptedto be the sole.

wit'hatpresser foot, a connecting rodextend- I ingrearward therefrom, a thread-measuring l adjusting lever connected with the connect-"- ing. rod and .provided'at its upper-endwith with the thread measuring adjusting lever, pawls adapted to be moved by said thread lever connected with said connecting rod and formed at its uppenend'with teeth, a thread-measuring lever carrying'an adjustingscrewat its lower end for-engagement the arm'30. in contact with its cam, and asof the spring 37' and'hence increasing theandunloch the presser-toot in relationto the feedmg of thestock, said spring connected whereby the tension otthe presser' foot 18" 2. In a sewingmachine, the combinationw1th.a presser foot, aconnecting rod extend ing rod,- provided at. its upper end with ated thereby and adapted to be engagedwith 3. In a sewing: machine, the combination with a presserioot, a connecting rod extend-- ing rearward therefrom, a thread 5 measuring ingrod, provided at its upper end with.

engaged*with said teeth, a spring attached to the said thread adjusting lever, and means for automatically adjusting the tensionof the springiwith relationto. the thickness of 4; In a sewing machine, the-combination teeth, a thread measuring: lever cooperating measuringlever and to engage with said; teeth, aspring attached to said thread measuring ad usting lever, and means for therefrom, a thread measuring adjusting" with said measuring adjusting lever, pawls moved by said thread measuring lever and adapted to engage with said teeth, a pawllifting lever having a forwardly extending arm and a downwardly extending arm, springs connected with said arms, and cams for moving said levers, substantially as described.

6. In a sewing machine, the combination with a presser foot, a connecting rod extending rearward therefrom, a thread measuring adjusting lever connected with the connecting rod, provided at its upper end with teeth, pawls adapted to be engaged with said teeth, means for lifting said pawls out of engagement with said teeth, and a thread measuring lever cooperating with the thread measuring adjusting lever, substantially as described.

7. In a sewing machine, the combination with a presser foot, a connecting rod extending rearward therefrom, a thread measuring adjusting lever connected with the connecting rod, provided at its upper end with teeth, pawls adapted to be engaged with said teeth, a spring attached to the said thread adjusting lever, means for automatically adjusting the tension of the spring with relation to the thickness of the sole, a thread measuring lever cooperating with the thread measuring adjusting lever, and an adjustable stop screw mounted in said thread measuring lever, substantially as described.

In testimony whereof, I have signed this specification in the presence of two subscrib- A ing witnesses.

VICTOR SANDAHL. l/Vitnesses:

E. S. BOWERS, LAURA GIBB.

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