US1250437A - Feeding mechanism for sewing-machines. - Google Patents

Description

A. H. DE VOE. FEEDING MECHANISM FOB SEWING MACHINES. APPLICATION FILED MAR. 5. 1915.

1,250,437. I Patnted-Ilec.18',1917.

2 SHEETS-SHEET I.

WITNESSES.

H. DE VOE. FEEDING MECHANISM-FOR SEWING MACHINES.

I APPucAnou FILED mm. 5. 1915. 7 1,250,437. Patented De0.18,1917-. 1 2 su'izfs-fsuin g.

ATTORNEY j onrrnn srarns PATENT onnion.

ALBERT H. DE VOE, or WESTFIELD, new JEnsnY, ASSIGNOR TO THE SINGER MAnUrAo' TUBING COMPANY, A CORPORATION on NEW JERSEY.

rnnnme MEoHAnis ron SEWING-MACHINES.

Application filed March 5, 1915. Serial No. 12,274.

To all whom it may concern:

Be it known that I,.ALBr.R'r H. Von,

a citizen of the United States, residing at Westfield, in the countyof Union and State.

of New. Jersey, haveinvented certain new and useful Improvements in Feeding Mechanisms for Sewing-Vlachines,of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to improvementsin feeding mechanism for sewing machines and particularly that class of sewing ;mach1nes adapted to-act. upon heavy work such as burlap bags, overalls and the like. In work of this character it has been customary to em ploy auxiliary feeding means. in connection with the main feed device in orderto assist.

' the latter in its feeding action, and particuments a unitary feeding structure is pro-.

vided which overcomes the necessity for aux iliary feeding means.

In thepresent construction theimprove ments comprise a feed-dog having a gripto be pressed downwardly by a spring ad-' ping surface of large area and cooperating with a plurality of presser-members each. in-

dependently yielding and arranged in such manner that they may be simultaneously raised by means of a single lifting-lever. The forwardly disposed presser-member is arranged with its work-engaging surfacemainly behind the needle and is intended to be pressed downwardly by a spring pref-. erably so adjusted as to produce a relatively.

light pressure upon the work. The rear- Wardly disposed presser-member is preferably arranged as closely as is practicable to the forwardpresser-member and is adapted justedto produce a relatively heavy pressure thereon to enable the feed-dog to firmly engage and feed the stitched work. The feed-dog is so related to its supporting and actuating members that throughout its feedingaction on the work it remains substantially parallel-with thethroat-plate and in operative relation with. each of the pressermembers. The feed-dog is supported'at the upper end of a sliding post-loosely fitted within apertures formed in the intermediate yoke-shaped portion of a reciprocatory feed-.

bar suspended between two links which connect the arm with supporting shafts, one of the shafts being an-actuating rock-shaft to which one link is fixed and henceoperative as a crank-member to transmit reciprocatory movements to the feed-bar and feeding movements to the feedrdog. The said rockshaft has a slide-pin and socket connection with an adjustable eccentric on the driving.

shaft; and a second eccentric on the shaft is connected bysimilar elements with a feed lifting-lever fulcrumed upon the frame and having a link connection with the sliding post which sustains the feed-dog.

The means for liftingthe presser members simultaneously comprise a lifting-lever fulcrumedupon the frame of the machine and connectedwith a sleeve loosely 'fitted' upon one presser-bar. immediately below a collar thereon. An arm projecting from the.-

sleeve immediately below. the collar or collars carried by the other bar or bars serves to engage and. move the said bars. upward whenthe sleeve is. raised; and inasmuch as the said collars are above the actin faces of the sleeve and arm each bar may yield inde'-; pendently of its fellow bar or bars. ln'the Specification of Letters Patent. Patented Dec. 18, 1917."

present arrangement the pres'ser-bars are in tandem at the rear of the needle or needles.

In the drawings, Figure 1 is a front elevation of a machineembodying the present 5f improvements and Fig. 2 isa rear perspective of the same the frame of the machine beingindicated by dotted lines in each of said figures. Figs. 3, 4 and 5 are detail perspective views of the feed actuating, ele-' ments.v Fig. .6 1s a perspective v1ew of certain elements by means of which the presserbars are simultaneously raised.

As represented in the'drawings, the im-.:

provements are shown applied to a sewing machine frame comprising the bed A, standard B and overhanging arm G; Rising from the bed are the bearing supports a, Z) and 0, f

and secured to the upper faces of the supports a and b, by means of fasteningscrews l,vis the throat-plate2,'f ormed, as usual,

with a serrated upper face and with longitudinal slotsto receive the toothed sections of the fee d-dog 3, v

The feed-dog is secured upon the upper end of a slide-pin etloosely fitted within the apertures 5 and 5" of a feedbar 6, the lower aperture 5 being formed in an intermediate underlying arm 6 of the feed-bar. The feed-bar is provided at its ends with the apertured bosses 7 which are adapted to receive the pins 8 which serve to connect the bar to the sustaining links 10 and 11. 'he link 10 comprises two spaced sections rigidly connected by. a lower apertured b0ss'12'and an intermediate cross-barlO, the link 10 being pivotally mounted upon a short shaft 13 fitted within suitable apertures formed in the bearing supports 6, 0, at the rear ofthe needles. The link 11 is mounted upon a rock-shaft 14 supported within bearing apertures formed in the supports a and o, and, as the said linkis secured in fixed-position upon the rock-shaft by means of a fastening screw 15, it acts as a crank-arm to transmit motion from the shaft to the feed-bar 6 and feed-dog 3.

Thefeed actuating rock-shaft 14 receives its motion from anadjustable eccentric 16 on thedriving shaft 1'7. The feed actuating eccentrio 16 is e-mbraced by a sleeve 18 formed with a boss l8 apertured to receive the slide-- pin l9 held withinthe aperture 20 of a split-$100k 21 clamped upon the feed actuating rock-shaft 14 by means of screws 22.

By adjusting the eccentric 16in a manner known in the art a rorresponcling adjustment may be made in the length of feed.

The feed-lift mechanism comprises a lever 23 f'ormed withthe parallel arms a and f andthe aperturcd yoke g: embracing the lower endof link 10 and loosely mounted upon the short shaft 13. Thelever 23 re-- cei-ve's its motion from an eccentric on the driving shaft l7,'theecentricbei'ng en-1'- braced by the sleeve 25 a-t the upper end of ashort pitman 26 formed with a lower transverse aperture to; receive the slide-pin 27 secured in the apertured arm 7 of lever 23 by means of the screws 28. Theencl of thelever-a-rm c is: apertured -to receive a stud 29 carried at the-lower end of a yokelinlr30 embracing and pi-votally connected to a clamping block 31-, the pivotal connection being a stud 32. The block 31 isapertured and split to be cla mped upon the slide-pin 4 of the feed-dog, a: clamp screw 33 'serving to secure the block in fixed position upon thesaid pin.- To guidethe clamping block 31in its movementsi a guide -pin 34 isiittcd within suitable apertures formed" in the feedbar G and a vertical groove 35-is formed in theiclamping block 31 to receive the said guide-pin.

The feed-dog cooperates v withthe two;

presser-feet 36 and 37 pivotally connected to shank-members 36 and 37*. The shankmember37 of pressere foot 37 is clamped by meansof screw 39 upon presser-bar 40, and the shank-member of Presser-foot 36, is clamped by means of screw 41 upon the presser-bar 42, the said presser-bars being mounted within'suitablc bearing apertures formed in the head of the overhanging arm Get the rear of the needle-bar 43. Any suitable spring devices, such as the leaf springs and 42 may be employed to exert yielding pressure on the presser-bars 40 and 4L2 and adjusting means, such tl'iescre'ws 40- and 42, are provided for the purpose of varying the spring pressure on the presserbars 40 and 422 as may be desirable; The presser-bar i0 is embraced by a sleeve-dis posed immediately below a collarlb clamped upon the bar by means of-screw l6 and haw ing a lateral extension 45* slotted to afford a guide for the pressenb'ar 42. At its lower end the sleeve-44 is provided with a short arm 47 which liesimmediately below a block 48 fixed upon presser-bar 4-2 by means of;

clamping screw 49. Thusitwill be seen that relative slippage of the-layers of material being stitched together.- Inasmuch as pro VlSlOIl is made for ad ustln'g the springs independentlya relatively heavy spring-pres sure may be applied to the rear presser-foot 37 so that the feed-dog may firmly grip and feed the material Relative slippage of the various layers is not to" be feared at'this point as the workis securely stitched to-- gether; Since the presser feet 36 and 37 are arranged close together unduestretching of the stitched seam is avorded when an ob-- struction, such as a heavy cross-seam, is being drawn under the tip of-the front presser foot and, as arcsult; the stitch'es-are-all of uniform length. The close arrangement of the presser-fe'et also facilitates turnirrgcor ners and sewing curve'd seams of short radius as will be readily understood;

The presser-fee't may be simultaneously raised by means of a hand-operated: lifting lever 50fulcrumed upon the head of =the overhanging arm C at" 52v and formed with: a cam-nose 53' adapted tobe thrown into engagement with a. roller stud 54 carried by the sleeve 445, the lever being'operated in. the usual manner; If. it is desired, the

presser-feet' may be simultaneously raised ymeans of a treadle-op'erated lever. This lever 55 is fulcrumed upon the overhanging arm by means of a stud-screw 56 and at its forward end is apertured to receive a stud 57 projecting from the sleeve 44. In practice, the lever 55 is connected by a chain or rod to a treadle to enable the operator to insert and remove work from the machine without the necessity of employing the hands to manipulate the hand-lever 50.-

Having thus set forth the nature of the invention what I claim herein is 1. A sewing machine comprising in combination, a frame, stitch-forming mechanism including a reciprocating needle, a plurality of independently yielding presser-bars mounted in said frame, a presser-foot carried by each bar, said presser-feet being arranged one in advance of the other, the forwardly disposed presser-foot being arranged mainly in rear of the needle-path, and feeding mechanism including an elongated feeddog having a work-engaging portion opposed to and cooperating w1th sald presserfeet throughout its feeding action on the work.

2. A sewing machine comprising in combination, a frame, stitch-forming mechanism including a reciprocating needle, a plurality of independently yielding presser-bars mounted in said frame, a pivotally mounted presser-foot carried by each bar, said presser-feet being arranged one in advance of the other, the forwardly disposed presserfoot being arranged mainly in rear of the needle-path, and feedin mechanism including an elongated feed- 0g having a workengaging portion opposed to and cooperating with said presser-feet throughout its feeding action on the work.

3. A sewing machine comprising in combination, a frame, stitch-forming mechanism including a reciprocating needle, a plurality of independently yielding presser-bars mounted in said frame, a pivotally mounted presser-foot carried by each bar and having a substantially fiat work-engaging surface, said presser-feet being arranged one in ad Vance of the other, the forwardly disposed presser-foot being arranged mainly in rear of the needle-path, and feeding mechanism including an elongated feed-dog having a work-engaging portion opposed to and cooperating with said presser-feet throughout its feeding action on the work.

4. A sewing machine comprising in combination, a frame, stitch-forming mechanism including a reciprocating needle, a plurality of spring-pressed presser-bars mounted in said frame, means for adjusting the spring-pressure on at least one of said presser-bars, a presser-foot carried by each bar, said presser-feet being arranged one in advance of the other, the forwardly disposed presser-footbeing arranged mainly in rear ofthe needle-path, and feeding mechanism including anelongated feed-dog having a work-engaging portion opposed to and coiiperating with said presser-feet through out its feeding-action on the work.

5. A sewing machine comprising in combination, a frame, stitch-forming mechanism including a reciprocating needle, a plurality of independently yielding presserbars mounted in said frame, a Presser-foot carried by each bar, said presser-feet being arranged one in advance of the other, the forwardly disposed resser-foot being arranged mainly in rear of the needle-path, and feeding mechanism including an elongated feed-dog having a work-engaging portion opposed to and cotiperating withsaid presser-feet throughout its feeding action on the work, said feeding mechanism also including means for imparting work-advancing movement to said feed-dog while maintaining the latter in substantially parallel planes throughout such movement.

6. Feeding mechanism for sewing machines, comprising in combination, a frame, a driving shaft mounted therein, a feed-bar, a feed-dog having a work-engaging surface, a supporting post therefor mounted for sliding movements in said feed-bar in a direction transversely of said work-engaging surface, means connected to said driving shaft for imparting sliding movements to said post, spaced links carrying said feed-bar and confining it to move in substantially parallel planes, and actuating connections between said shaft and feed-bar.

7. In feeding mechanism for sewing machines, the combination with a frame and a driving shaft mounted in said frame, a feed-dog and a sliding post therefor, a feedbar formed with an apertured yoke affording spaced guiding members for said post, means for reciprocating said feed-bar, a rock-lever operatively connected with the driving shaft and a link connection between the rock-lever and the sliding post.

8. In feeding mechanism for sewing machines, the combination with a frame and a driving shaft mounted therein, of a feeddog and a supporting post therefor, a collar clamped upon said post, a feed-bar apertured to receive said post, a rocklever connected with the driving shaft, a link connecting the rock-lever and said collar, and spaced links between which the feed-bar is suspended, one of said links being operatively connected to the driving shaft to impart reciprocatory movements to the feedbar.

9. In feeding mechanism for sewing machines, the combination with a frame and a driving shaft mounted therein, of a feed-dog ALBERT H. DE 'von and a sliding post therefor an apertnred feed-bar adapted to receive said post, means for reciprocating said feed-bar, a feed-lift eccentric on the driving shaft and embraced by an apertured sleeve, a rook-lever having a slidepin fitted within said sleeve, and a link connecting the rock-lever and the said sliding post.

WVitnesses W. LEE HELMS, HENRY A. KORNEMANN, Jr.

Copies of this patent may-be obtained for five cents each; by addressing the Commissioner of Patents Washington, D. C.

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