US1300358A - Feeding mechanism for sewing-machines. - Google Patents

Description

A. H; DE VOE. FEEDING MECHANISM FOR SEWING MACHINES- APPLICATION FILED JUNE 3. 1914.

Patented Apr. 15, 1919.

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APPLICATION FILED JUNE 3,19I4.

Patented Apr. 15, 1919.

2 SHgETS-SHEET 2- WITNESSES.

- A TTORIVEV ALBERT H. DE

von, 0]? WESTFIELD, NEW JERSEY, ASSIGNOR ro THE SINGER MANUFACTURING C01V[]?ANY,'A CORPORATION OF NEW JERSEY.

FEEDING MECHANISM FOR SEWING-MACHINES.

Specification of Letters Patent.

Patented Apr. 15, 1919.

Application filed June 3, 1914. Serial No. 842,595.

To all whom it may concern.

Be it known that I, ALBRT H. DE Von, a citizen of the United States, residin at Westfield, in the county of Union and tate of New Jersey, have invented certain new and useful Improvements in Feeding Mechanisms for Sewing-Machines, of which the following is a specification, reference being had thereinto the accompanying drawings.

This invention relates. to feeding mechanism for that class of sewing machines adapted more especially for stitching heavy or stiff goods such as canvas and the like, which employ auxiliary feeding mechanism to aid the main feed-dog to properly advance the work through the machine.

In the present construction the machine is provided with the usual reciprocating needle and cooperating loop-taker mechanism, actuated from a main-shaft mounted in bearing-supports rising from the bed-plate below the usual overhanging arm. The main feed-bar is pivotally connected to and projects forwardly of a feed-rocker, and at its forward end is supported by the strap of a lifting eccentric on the main-shaft. To the feed-rocker is connected one end of a pitman provided at its opposite end with'a strap embracing a second eccentric on the main shaft, which serves to impart operative movements to the feed-rocker and hence feeding movements to the main feed-bar which receives rising and falling movevments from the first named eccentric.

Supported above the bed-plate at therear of the main feed-dog by a suitable sustaining member is a vertically-movable springpressed feed-roller which cooperates with an arcuately movable, rising and falling, auxiliary feed-dog. The auxiliary feed-dog is formed with a serrated'curved surface to correspond with the surface of the feedroller, and is provided with a sliding post which fits within the bearing sleeve of a rocking carrier journaled within suitable bearing supports at the rear of the main feed-dog. The auxiliary feed-dog carrier is 'ven its rocking movements by means 0 an adjustable link connection with the feedrocker which actuates the main feed-bar, so that simultaneous feeding movements are imparted to both the main and-auxiliary feeddogs from a common actuating member. The connection between the mainshaft and the feed-rocker permits a change in the throw of both feed-dogs by one adustment; and the connection between said rocker and the auxiliary dog is such as to permit an independent adjustment of the latter to change the length of tively to the main feed-dog. The means for imparting rising and falllng movements to the auxiliary feed-dog comprise an elbow-lever pivotally mounted upon a block. clamped upon the bearing sleeve of the carrier which receives the slidlng post of the auxiliary feed-dog. A link connects one arm of the elbow-lever withthe auxiliary feed-dog, and to the second arm of the elbow-lever is connected, either directly or through'certain instrumentalities, the rearwardly extending end of'a pitman which receives reciprocatory' movements from a third eccentric on the main-shaft;

The construction above set forth provides a positively driven auxiliary feeding member which is so connected with. the actuating mechanismfor the main feed-dog that its feeding movements are simultaneous with thelatter and of the same length, or of a greater or less length, as desired.

In the drawings, Figure 1 is a perspective View of the lmprovements applied the main-shaft is journaled in bearing supports rising from the bed-plate below the overhanging arm, the machine being shown in dotted lines. Fig. 2 is a side" elevation, partly in section, of the main and auxiliary feeding members and the operative connec tions between the same and the main-shaft of the sewing machine. Fig. 3 is a perspective view of the rocking carrier for the auxiliary feed-dog; and Fig. 4 is a Perspective view of the auxiliary feed-dog, the elbowlever which imparts rising and falling movements thereto, and certain connecting elements. Fig. 5 is a perspective view of a sewing machine provided with a modified form of the improvements. Fig. 6 is a perspective view of certain elements of the auxiliary feed-lift, as employed in the modified f form of the improvements. "Fig. 7 is a perspective view of the throat-plate, and Fig. 8 is a similar view of the presser-roller and connected parts employed in the modified form of the improvements.

As represented in the drawings, vention is shown in connection with a sewing machine constructed with the bed-plate its throw relato a Singer sewing machine of a type in which the inp A, standard B, and overhanging arm G in which is journaled the needle-actuating shaftlfthe latter-being operatively connected with theusualreciprocatory needlebar 2 carrying needle The needle-actuating shaft"1'receives 0p erative movementsthrough connections with the main -shaft4-whiclris journaled in suitable bearings within the standard B and a bearing support 5 rising from the bed-plate A The main-shaft carries at its end-the usual balance-wheel 6 andi's provided with a feed-lifting; eccentric? WlllCl'l is embraced by}"the strap 8; of a short pitinan 9, provided at its end with an apertureto receive a pivotal stud 10 which passes through a similar aperture formed in feed-bar 11, the latter being formed with a vertical channel to receive the supporting post 12 of the main fe'ed-dog 13. which is held in position by means of a fastening screw 14.

The' enlarged rearwardly extending end otthe vfeed-bar 11 is formed with a trans verse aperture to receive a-pivotal stud 15 supported within the. bearing bosses 16 01 the yoke-arm 16 forming part of'a feedrocker compri'singth'e arms 16, 17', 18 pro jecting from the hollow rockshaft 19 pivotally supported at each end by means of suitable center screws fitted'within bearing bosses onthe bed-plate A. One of said center screws is indicated by-the numeral 20' iii/Fig. 1, a cuppedbearing disk 21 being mterposed between said screw and the hol- 3-5 low' rock-shaft, said disk being suitably ing nut 24 and a washer 28 surrounding the -stud-screw 24 adjacent arm 17.

Rising from the bed-plate at therear of the main feed-dog 13 are arms D and E, the latter being provided with asubstantially U shapd extension E which adapted to sustain a p1'esse1'roller for use in conjunction with" an auxiliaryjfeeding member; as hereinafter more fully described. I

Fitted within v suitable bearings supported by the members D and E are thejfulcrum 'pins29 of a carrier-block formed with a" verticalaaperture within which "is fi'tted a bearing sleeve 31 which receives the sliding:

post 320i auxiliary feed-dog '33, the under facefof' the dog being formed With a depres- 6' sion or annular recess to receive the slightly two "supporting I 5 M enlarged head of the post, and thetwo menn bers being secured together by means of a "screw 34. Uponone fulcium-piii-QS) of the rocking carrier is fittedthe enlarged apertured and splitend 35. vof a crank-arm 35, said arm being clamped upon the pin by means of a screw 36*. In the opposite, end of the arm 35 is similarly clamped meat screw 37which passes through one end of a link-bar 38, the opposite end of said link bar being connected to arm 18- of the feed'-,

rocket: It will 'be seen thatit-he link-bar may be adjusted toward and from the axis of the feed-rocker to vary the movement of the rocking-carrier 31 and thus the throi'vf of the auxiliary feed-dog 33, such adjustmentbeing e fitected by loosening the nut 40.011]

stud-screw 39 to permi't'sa-id screw 'to be moved within'the slot 41 of the'arm 18.

An elbow-lever 42 is employed toim'p'art rising and ralhng movements to the auxiliary feeddog "33. The said elbow-lever is provided with 'a boss 42' which-fits upon astud 43 projecting laterally from-asplitfand apertured block 44 clamped upon the bearing-sleeve 31- of the 'rocking carrier 301 @ne end of the elbowdever' is apertured-to receive a stud-screw 45 Which is held in position by means of nut'46. Theprojecting end of stud fits within the lower" transverse boss 46* of a link 47, the upper similarly formed boss of which fits betweenthe' apertured lugs 48 of the auxiliary feed-dog 38, a pin 49 being employed to pivot-allv connect said link and the dog; the pin being'held inposition by means of clamping:

screws 50. i

It will be seen that theactuat'lonof elbow lever 42 will impart vertical reciprocatory .or

rising and falling movements to the feeddog, during which movements the post '82 will slide within the bearing sleeve 31ot carrier 30. i The auxiliary dog rises immediately after the carrier 30 moves the same to its forward position prior .to a feeding movement; and at the termination of the feeding movement. said feed-dog is-lowered by the reverse movement otthe elbow lever 42. The elbow-lever is operated by meansv ot a pitman connection with'a'n eccentricon the main-shaft, the rear end of the pitman 51'- being apertured to receive a stud 52 on one arm of the elbow-lever, and the forwardly pro ecting T-shaped end 51* of the pitman fits u )on and is )rovidedwith astraDfSS l a l which embraces'the eccentr1e54ysa1d strap, being held in position by meansofserewsz The block 801s cut awayf'ad acent the bearing sleeve 31 to form are'eess-fto rece "61 and that end of the pitman connected and permit movement of the elbow lethereto.

A vertically movable p resser-rolleris, e'm ployed in COHJllIlCtIOn'Witll the auxiliaryi feed-dog. As 'hereinbefore stated;

, presser-roller is sustained by the extension E of bearing support E, said extension being provided'at its upper end with parallel vertical bearing bosses 56 and 57. The toothed presser-roller 58 is mounted on a horizontal stud 59 supported by the downwardly extending arms 6O of a bracket 60 provided on its upper face with the supporting pin 61 which fits loosely within boss 56 of the extension E. The bracket also carries a guidepin 62 which slides within boss 57 of said extension. The pin 61 is provided with an ad justable stop-ring 63 which abuts the upper face of boss 56 and limits the downward movement of the feed-roller, being held in its adjusted position by means of a clamping-screw 64. Intermediate the lower face of boss 57 and the upper face of bracket 60 and surrounding the guide-pin 62 is a coiled spring 65 which acts to press the feed-roller downwardly into engagement with the fabric. The upper portion of the coiled spring 65 is engaged by the lower end of a hollow thumb-screw 66 movable within boss 57 and serving as a bearing for the guidepin. It will be seen that manipulation of thumb-screw 66 will change the tension of spring 65 and hence the pressure of the feedroller upon the fabric.

A lifting lever is employed to raise the feed-roller against the action of its spring, and for this purpose the extension E is provided with a transverse boss 67 adapted to receivea short rock-bar 68 which projects from each face of the extension sufliciently to permit hand-operated lifting-lever 69 and 'a treadle-operated arm 70 to be clamped thereto. The lever 69 is provided with a nose 69 which lies under a' roller 7l'on the feed-roller supporting bracket 60. It will be seen that the bracket 60 and the feedroller supported thereby may be elevated by hand pressure upon lever 69 or by actuation of the arm 70 through the intermediary of a suitable treadle device, as desired.

A modified form of the improvements is illustrated in Figs. 5 to 8 of the drawings to adapt the same to a Singer machine of a type different from that shown in Fig. 1. In the modification, the feed-rocker comprises the member 72 mounted upon a shaft 73 fitted within bearings afforded by the bearing supports F and G rising from the bed-plate of the machine, and having the depending arm 74 connected by means of pitman 75 and strap 7 5 with the adjustable feed-actuating eccentric 76 on the mainshaft 4.

The enlarged rearwardly extending end of the feed-bar 77 is mounted upon a pivotal stud supported within the bosses 72 on the feed-rocker. At its forward end the feedbar is'provided with a yoke 78 which em braces a block 79 mounted upon the feedlift eccentric. on the main-shaft, whereby rising and falling movements are imparted to the main feed-dog 80. The construction of the auxiliary feed-dog 33, the rocking carrier 30 therefor, and the elbow-lever 12 which serves to transmit rising and falling movements to the auxiliary dog, is the same in both forms of the improvements. The feed-rocker72 is operatively connected to the carrier 30 by means of a link-bar 81 secured at one end by means of stud screw 81 to the depending arm 82 of the rocker and atits opposite end to a slotted crank-arm 83 clamped upon one of the carrier fulcrumpins 29. The connection between the feedrocker and the carrier 30 is an adjustable one to permit changes in the feeding movements of the auxiliary feed-dog relatively to the main feed-dog and the adjustable feed-actuating eccentric 76 permits regula-' tion of the stitch length by simultaneously changing the effective movements of each feed-dog.

The elements employed to raise and lower the auxiliary feed-dog are the same as those illustrated in Figs. 1% of the drawings, with the exception that a rockerand link are interposed betweenthe elbow-lever 42 and the actuating pitman 51. The rocker in question comprises the rock-shaft 84c mounted within the bearing support F and having clamped thereon at one end the slotted arm 85 which receives thestud-screw 86 of the pitman 51. Upon the opposite end of rock-shaft 8% is secured the upwardly extending arm 87 which carries a stud-screw'88 fitted within the enlarged apertured end of ashort link 89 having its opposite end fitted upon the stud 52 of elbow-lever 4:2. It will beseen that pitman 51 will rock arm 87 and, through the link connection with elbow-lever 42, will alternately raise and lower link 47 and the auxiliary dog 33 connected therewith; and

it will also be seen that the adjustable conment of the auxiliary dog to correspond with I changes in the thickness of the material be-' ing acted upon.

The presser-roller 58 employed in the modification is constructed similar to that illustrated in Fig. 1 of the drawings. In the modification, however, the presser-roller is sustained by a forked extension 9O of the lifting lever 90, and the latter is provided with a transverse bearing stud 91 which fits within the bearing bosses 92 of a bracket 93 secured upon the head of the overhanging arm C. A coiled spring 94 having one end fitted within a socket formed in the head of the machine and its opposite end fitted within a socket formed in the inner face of ferent'thicknesses, and to prevent the pressure of'the feed-roller upon the teeth of the auxiliary feed-clog when the material is removed from the machine a detent-member 95 is provided to engage a pin 96 projecting from the face of the lifting lever 90 where'- by the feed-roller may be held slightly above the'toothed face of the auxiliary feed-dog. The detent-member may be moved endwise to varythe distance between the presserroller and the auxiliary feeddog, a clamp-- ing screw 99 serving to hold the detent member in its adjusted position. The presser-roller may be elevated by pressure upon a hand piece h extending from the lifting lever 90 above the head of overhanging arm C. I

In Fig. '8 of the drawings, a treadle-operated device is illustrated whereby the presser-roller may be elevated by foot-pressure simultaneously with the elevation of the presser-foot (not shown). Supported by two bracket 98' and 98 secured upon the overhanging arm C, is a rock-shaft 99,

' operated through treadle connections with chain 100 and rock-arm 101 to simultaneously raise its connected arm 102 and swing inwardly its arm 103, whereby the link-bar 104 connected intermediate arm 102 and a collar 105 on presser bar 79 is lifted to elevate the presser-foot, and a link 106 con- 'nected intermediate projecting pin 96 of the lifting-lever 90 and arm 108 is moved endwise'to rock the lifting-lever and thereby elevate the presser-roller 58.

'Upon the horizontal seats F and G afforded by the bearing supports F and G is secured a work-plate section 107 partially cut away intermediate its ends and formed The throat-plate 108 is provided with crossbars 108* spaced to correspond with the grooves formed in the auxiliary feed-dog and presser-roller, said cross-bars being formed with concaved lower faces so that the grooves 1n the auxiliary dog may be made as shallow as possible without affecting the normal rise of the dog to work engaging position. The cross-bars 108 in the 1 throat-plate possesses a function not present in the usual sewing machine throat-plate.

This function is to counteract the tendency of the arcuately-movable auxiliary feed-dog to pull the material downward in a plane intersecting the work-plate, as the feeding progresses.

It will be understood that the invention is susceptible of various changes in the form and arrangement ofthe cooperating elements, in addition to those of the m'odification above described, and that the same is not limited to the in illustrated.

Having thus set forth the nature of tho invention, what I claim herein is 1. In a puller feeding mechanism for sew-' precise embodiments hereing machines having a needle, the combination with a main feed-dog adjacent the needleand-an auxiliary feed-dog located remote from and in rearof the needle, of an actuating rocker common to both dogs and adapted to impart simultaneous feeding movements thereto, means for changing the length of feed of both dogs simultaneously,

and means' for changing the length of feed' support to impart feeding movements. to

the feed-dog and additional means ad justable upon the support and operatively connected with said shaft for moving the feed dog relatively to the support and into and out of feeding position.

3. In feeding mechanism for sewing machines, the combination with an actuating shaft, of a mam feed-[dog and lifting means therefor on said shaft, a feed-rocker actuated by said shaft, a rocking support op eratively connected to sald feed-rocker, an.

auxiliarv feed-dog mounted on said support for movement relatively thereto, means 1ncluding a lever fulcrumed upon said rocking support and operatively connected with 1 the said actuating shaft for effecting rismg and falling movements to the auxil ary feed-dog, and a connection between said feed-rocker and the main feed-dog.

4/111 feeding mechanism for sewing ma chines, the combination with an actuating shaft, of a feedrrocker and operative connectionsbetwee-n the same and said actuat ing shaft, a rocking support provided with a bearing sleeve, a feed-dog provided with a post adapted to slide withinsaid bearing sleeve, an elbow-levermovable upon said rocking support, a connection between said elbow-lever and the feed-dog, a link connection between the feed-rockerand said rocking support and adjustable independently of the latter, and actuating means for said elbow-lever.

5. In' feeding mechanism for sewing machines, the combination with a feed-dog and a post upon which the feeddog is mounted of a rock-bar provided with a. bearing-sleeve adapted "toreceive' the post of the feed-clog, a block adjustably secured to saidsleeve and carrying a fulcrum stud, an elbow-lever mounted u'pon said stud, a link connection between the feed-dog and said elbow-lever,

an actuating shaft, actuating means con chines, the combination with an actuating shaft and a feed-rocker operatively connected thereto, of a main feed-dog connected to said feed-rocker, a rocking support, an auxiliary feed-dog mounted upon said rocking support, means for raising and lowering the auxiliary feed-dog relatively to its rocking support, an operative connection between the feed-rocker and said rocking support, means for changing the length of movement of both feed-dogs simultaneously, and means for changing the length of movement of the auxiliary feed-dog relatively to the main feed-d0g.

7. A sewing machine having a main work advancing mechanism including a feed-dog and a cooperating Presser-foot in combina tion with puller feeding mechanism including an arcuately movable feed-dog and a cooperating presser-member in rear of and spaced from the primary work advancing mechanism, common means for imparting feeding movements to said dogs independent means for imparting lifting movements to said dogs, and means for chan 'ng the feeding movements of the puller, eed dog Without varying the action of the main dog.

8. In feeding mechanism for sewing machines, the'combination with spaced main and auzn'liary feed-dogs and a feed-rocker intermediate the same, of an actuating shaft provided with a feed-lift eccentric for the Copies of thispatent may be obtained for five cents each, by addressing. the

main dog, an operative connection between said shaft and the feed-rocker, an adjustable link connection between the feedrocker and the main dog, a second rocker on which the auxiliary dog is slidingly mounted for endwise movement, a feed-lift lever carried by said second rocker and connected with the auxiliary dog, an adjustable connection between the feed-rocker and the second rocker, and an operative connection between the shaft and the feed-lift lever.

9. In a puller feeding mechanism for sewing machines having stitch-forming mechanism including a needle, the combination with a main feed-dog having a feeding surface extending rearwardly of the needle throughout the stroke of the feed-dog, of a supplemental feed-dog operating in the rear of and spaced from the main dog, a main shaft, independent eccentrics on the mainshaft for imparting lifting movements to both dogs and a single eccentric also on the mainshaft for simultaneously imparting feeding movements to both dogs.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing Witnesses.

ALBERT H. DE VOE.

Commissioner of Patentu,

Washington, D. G.

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