US960464A - Feeding mechanism for sewing-machines. - Google Patents

Description

J. P. WEIS. FBEDING MBGHANISM FOR SEWING MACHINES.

AYPLIATION FILED MAY 1l, 1905.

A Patented June 7,1910.

" c ric.

JOHN P. WEIS, OF NYACK, N EW' YORK, ASSIG-NOR TO METROPOLITAN SEWING MACHINE COMPANY, OF NYACK, NEW YORK, A CORPORATION 0F NEW YORK.

FEEDING- MECHANISM FOR SEWING-MACHINES.

To all whom it may concern:

Be it known that I, Jol-IN P. WEIs, a citizen of the United States, residing in Nyack, county of Rockland, and State of New York, have invented a new and useful Improvement in Feeding Mechanism for Sewing- Machines, of which the following is a description.

This invention relates to sewing machines and has particular reference to the feeding mechanism thereof,

Among the objects of this invention may be noted the following: to provide a simple, compact arrangement by means of which the stroke or length of the feed movement may be readily, quickly and accurately regulated; to provide a smooth, easy-running and noiseless feed mechanism; and to so locate the adjusting means for regulating the length of the stitch as to make it accessible and easily reached by the hand ofthe operator for making adjustments; to provide a compact and easy running device for raising and lowering the feed-bar; to provide a structure in connection with both the actuating mechanisms by which the parts are prevented from wearing, and lint, dust and grit are prevented from reaching the surface of the eccentrics; and to provide means by which the parts may be freely lubricated without throwing oil during rapid operation.

' Other objects will be exposed during the course of this description, and with them all in view, together with those above enumerated, the invention consists in the parts, features and combinations of elements hereinafter described and claimed.

Only so much of a sewing machine has been portrayed in the drawings accompanying this description as is deemed necessary to illustrate the disposition and construction of the feeding mechanism5 and in said drawings:

Figure 1 shows in plan a portion of the forward end of the bed-plate of a sewing machine with the feeding mechanism applied thereto; Fig. 2 is a front end elevation of Fig. 1; Fig. 3 is-a longitudinal, sectional view showing the details of the feed-adjusting and actuating mechanism; Fig. 4 is an enlarged sectional elevation of the stitchregulating eccentric and adjacent parts; and

. Fig. 5 is a perspective of the stitch-regulating eccentric with coperating parts.

Specification of Letters Patent.

Application led May 11, 1905.

Patented June 7, 1910. Serial No. 259,858.

In the drawings, the numeral 1 designates the bed-plate of the machine, 2 the front standard or support to which is secured the front end of the cloth-plate (not shown) and in which the forward end of the driving-shaft 8 is journaled. Beyond this support the driving-shaft is reduced in size so as to form, or has suitably secured in or to the end thereof, the extended, eccentrically set crank or pin 4, the end of which is grooved at 5, and screw-threaded as shown at 6. Journaled upon this pin 4, is the eccentric-sleeve 7, having the enlarged head or end-portion 8 and the slightly enlarged, knurled portion or flange 9. This construction of feed-actuating device constitutes a duplex eccentric, one portion of which is movable on, or relatively to, the other, for the purposes to be presently described. The said enlarged port-ion 8 is calibrated or provided with scale-marks 10, indicative of the length of stitches which may be made, or the number thereof to the inch, in accordance with, and corresponding to, the adjustment of the eccentric '7 on the pin 4.

Adjacent the standard 2, a washer 11, is applied over the pin in order to form a smooth bearing for the end of the eccentric 7, and its strap to be described; and at the other end of the eccentric a pointer-plate 12, is applied to the pin and held from circular movement thereon by means of the feather 13, entering the groove 5 in the pin. The pointer is produced by cutting away sections of the plate 12 so as to leave the slender portion or linger 14, which extends to the periphery of the head 8 of the eccentric and cooperates with the calibrations thereon according to the circular movement of the latter. The nut 15, screwed on the end of the pin 4, clamps the pointer-plate, eccentric and washer tightly together and against the end of the shaft, in order to bind the several parts together and cause them to rotate as one.

The split-strap 16, is clamped loosely upon the eccentric by means of the screw 17V passing through the two ears 18, the said strap being extended to form the pitman 19 clamped upon the end` of the shaft 20, journaled in the bearings 21 at the upper end of the rocking-frame 22, which frame in turn is, by means of the split bearings 23, tightly clamped upon a rod or shaft 24, the screws 25 passing through ears of said bearings,

.the pitman 19 being clamped in similar manner to shaft 20, by screw 26. Rod or shaft 24, is journaled for rocking movement in the extended bearings 27 of the bed-plate. The feed-bar 28, at its rear end, is provided with the extensive tubular journal-bearing 29, which receives the short shaft 20 Vand is disposed between, the two journal-bearings 21 of the rocking-frame; and said feed-bar has at its forward end the enlarged head'31 having` the forward, narrow extension 32 to .which is secured for vertical adjustment, the

screws 37 tapped therethrough and into said shaft. A strap 38 surrounds the said eccentric and is provided with an ear 39 extended into a longitudinal slot 40 in the bottom of the head 31 of the feed-bar, the wall, formed by said slot in said feed-bar head, as well as said ear, being transversely bored for the reception of a pin 41 which is fixed by means of a screw 42 to said ear 39, thus providing 4oppositely extending journals forming a pivotal connection between said strap 38 and said feed-bar head. The eccentric 4which gives the vertical rise and fall and the eccentric which gives the longitudinal movement to the feed-bar are adjusted relatively on the shaft so as to produce the rise and fall of the Vbar in alternation with the longitudinal movements, in order to impart to said feedbar the usual four motions for feeding purposes.

The operation of this feeding mechanism will be obvious upon inspection of Figs. 1 and 3,1and it will be understood Vthat to regulate and determine the amount of feed movement, or the number of stitches to the inch, it is only necessary to release the 'nut 15, turn the eccentric 7 Vupon its other eccentric part Vor pin until the calibration desired coincides with the pointer 14, and then re set the nut in order to hold the adjustment thus secured. The rotation of the drivingshaft, will rotate the two eccentrics, :thev duplex feed-stroke-giving eccentric and the eccentric for giving the rise and fall in their respective straps, causing the pitman 19 to vibrate the rocking-frame 22, which in turn will reciprocate the feed-bar longitudinally,

and' causing the vertical rise and fall to be imparted to the feed-bar by the strap'38 pivoted to the head of said bar. This pivotal connection permits perfect freedom of movement between the feed-bar and eccentric strap 38,-said slot 40Y being sufci'ently extensive for any longitudinal movement which can be imparted to the ban--V andthe ear 39, being'guided in slot 40, prevents any lateral movement of strap 38 on the eccentric, and the'feed-bar, also holding the strap upright, prevents the latter from flexing and Vcompels it to ride the eccentric evenly and smoothly. Y

It will be noted that the two straps, surrounding theV two eccentrics, entirely cover Y the same and fit quite closely, thus preventing grit, lint, dust or other substances from reaching the working surface of the eccen- V.trics, hence preventing any wear thereon from the grinding action which usually occurs between the driving and adjusting parts of the conventional feed mechanisms. This is a very important feature, because grit and lint from the work and dust from the surroundings quickly collect on and stick to the usual exposed surfaces and get between the operating oiled parts, Vquickly making a thick, gritty gum which wears away expensive parts, retards the speed of the machine, and' necessitates greater power to run the latter. The pivotal" connection between'the ear 39 andthe feed-bar head 31, being under and below the feed-bar, is not exposed and cannot become clogged, as will be apparent.v And as the strap 16 ts snugly between Vthe head 8 of eccentric 7 and the washer 11, there is no chance'for the ent-rance of dust, etc., 'to impede the move- -ment of Vthese parts.

y The various parts which need lubrication are fed with 'oil'by means o-f a4 wick; that is to say, the driving Vshaft 3, is fed by the wick 43, inserted in a bore of the standard 2, oil being 'admitted through hole 44; the eccentric 35 is fed by the wick 45, inserted in a bore of the strap 38, oil being admitted at the' outer endf of the wick; the eccentric 7 is fed by wick 46,-Fig. 2,-inserted in a bore of strap 16, oil being admitted at the outer Aend of'thewick; and the journal-pin 41 is oiled through hole 47, in head 31, in which a wick may be inserted to prevent admission of grit,'etc. It will be noted that the wicks 43, 45 and 46 have extensive bearing upon the parts to be oiled, the bores being slotted for the purpose of allowing said wicks to be in direct contact with said. parts. This construction'prevents an excessofv oil being fed to the operating parts, and no oil can be thrown off by the latter or leak; and said parts will always be sufficiently supplied with oil.

Among the advantages of this invention, the following may be noted: The location and disposition of the stitch-regulating eccentric, at the end of the driving-shaft loeyond the machine-standard, isJ such as to enableready access thereto and to enable the nut 15 to be loosened-and the eccentric to be easily adjusted .with reference to the pointer-plate, according to the adjustment desired. Y The eccentric disposition of the crank-pin 4 andthe addition thereto of the eccentric l7 produce Va, doubleor duplex feedroo adjusting device which enables a long stitch to be produced by an extensive throw of the feed-bar through the intermediate connections, by adjusting devices which are individually small, compactly arranged and structurally combined so as to occupy but small space; the pivotal connection between the feed-bar and the eccentric 35 for giving the rise and fall thereto provides a compact arrangement by means of which the feedbar can be given its feeding movements without having wearing contact with the eccentric or causing the eccentric-strap 38 to wear thereon by movements imparted to the bar for the feed stroke; that is to say, the eccentric 35 merely rotates in the strap and the latter has no other wearing action upon the eccentric, nor upon the feed-bar, the movements of the lat-ter relatively to the said strap being easy, practically without friction, and such as to avoid any character of impediment in the action of either the bar or the strap; by the employment of t-he eccentrics as described, for giving the requisite movements to the feed-bar and encircling the same with straps as shown, provision is made for avoiding the accumulation or admission of dust, grit, etc., on those surfaces which ordinarily receive the greatest wear and friction and which are most expensive; lubrication of all the parts is successfully produced by the provision of the wick-devices having direct contact with the wearing surfaces and which absorb the oil and prevent the latter from reaching the parts in excess of the demand, and prevent the accumulation of oil to an extent which, during the rapid operation of the machine, rwould throw or flirt t-he same upon adjacent part-s in the old objectionable way; and the compactness of the respective parts and their relative combination, and the disposition of the stitch-regulating mechanism produce a simple, readily accessible, easily manipulated, smooth-running and reliable feed mechanism, capable of attaining high speed without excess of friction between the parts, the application of power thereto and without possibility of wear upon the vital and expensive portions thereof.

Having thus described my invention, what I claim and desire to secure by Letters Patent is:

1. A feeding mechanism comprising a feed-dog-carrying bar; and means for giving the said bar longitudinal reciprocations, including a driving-shaft, a pin carried by one end thereof eccentrically thereto, a pitman having an end surrounding said pin and connected at its other end to said bar, and means carried by said pin within the first-named end of said pitman for regulating the throw of said feed-bar.

2. A feeding mechanism comprising a feed-dog-carrying bar; means for giving the said bar longitudinal reciprocations, including a driving-shaft having an extended eccentric pin connected thereto; a pitman having an end surrounding said pin and connected at its other end to said bar; an eccentric surrounding said pin within the firstnamed end of said pitman having means for rotating the same on said pin for regulating the movement of the feed-bar.

3. A feeding mechanism comprising a feeddog-carrying bar; means for giving the said bar longitudinal reciprocations, including a driving-shaft having a pin extended therefrom eccentric to its longitudinal axis; an eccentric independent of and carried by said pin beyond the end of said shaft; means connecting said eccentric with said bar; and means for adjusting said eccentric circularly on said pin to regulate the feed movement of said bar.

4E. A feeding mechanism comprising a feeddog-carrying bar; and means for giving the said bar its longitudinal reciprocations, including a driving-shaft, a pin carried eccentrically by and extended from the end thereof, an eccentric-sleeve surrounding said pin, means for adjusting said eccentric sleeve on said pin for varying the feed movements and a pitman engaging the eccentric-sleeve and connected to the said bar.

5. A feeding mechanism comprising a feed-dog-carrying bar; and means for reciprocating the same, including a drivingshaft, the end of which carries a pin in extension thereof and eccentric thereto; an eccentric mounted on said pin beyond the end of said shaft; means for adjusting the eccentric circularly on said pin for regulating the feed movement of said bar; and a connection between said eccentric and said bar.

6. A feeding' mechanism comprising a feed-dog-carrying bar; means for giving the said bar its longitudinal reciprocations, including a driving-shaft, a reduced pin carried by the end of said shaft eccentric to it-s longitudinal axis, an eccentric carried by said pin beyond the end of said sha-ft, means for connecting the eccentric with the feedbar, and means cooperating with said eccentric whereby the exact amount of feed to be imparted to the bar may be indicated.

7. A feeding mechanism comprising a feed-dog-carrying bar; and means for giving the same longitudinal reciprocations, including a driving-shaft, an eccentric mounted rotatably thereon, a pointer mounted on said shaft adjacent the eccentric but held from rotation on said shaft, and means for clamping the pointer and eccentric rigidly together and upon said shaft.

8. A feeding mechanism comprising a feed-dog-carrying bar; and means for reciprocating the same longitudinally, said means including a driving-shaft, an eccentric mounted adj ustably on the latter having a knurled head provided with calibrations, and means, also mounted on said shaft adjacent said.. eccentric, but held from rotation on said shaft, coperating with the calibrations of vthe head whereby to indicate the adjusted position of the eccentric and the movement of said bar.

19; A feeding mechanism comprising a feed-bar, and means for imparting the feedmovement thereto, said means including a driving-shaft and a duplex eccentric for regulating the feed-stroke one part of which is rotatably mounted on the other and l0- cated at the free end of the driving-shaft so as to be accessible to the operator for adjustment, and means carried by said rotatable part for adjusting the same.

l0. A feeding mechanism comprising a feed-bar, and means for imparting the feed movement thereto, said means including a driving-shaft, a duplex eccentric one part of which is iXed and the other movable relatively to saidv shaft, means for adjusting the movable part of said eccentric circularly relatively to the other to regulate,

escasa ing mechanism supported by the frame including a feed-bar, and actuating mechanism for said bar comprising a duplex eccentric one part of which is rotatably mounted on the other and on said free end of said shaft, means carried by said part whereby it may be rotated, and means on the extreme end of said shaft for indicating the adjustment of one part of said eccentric relatively to the other, whereby to determine the stroke of the feed-bar. K

13. A feeding mechanism comprising a feed-bar, and means for actuating said bar, said means including a driving-shaft having a reduced extended pin, aneccentric having an enlarged head carried by said pin, a plate carried by said pin between the eccentric and end of said shaft, and a strap surrounding said eccentric and filling the entire space between its head andsaid plate, whereby grit, etc., is prevented from reaching said eccentric.

14. A feeding mechanism for sewing machines comprising a feed-dog-carrying bar; and Ameans for actuating theV said bar, including an eccentric, a strap completely sur- `rounding the eccentric and having an. opensided recess therein extending from side to side of said eccentric, and a lubricator held in and filling' said recess and projecting through its open side in direct contact with the eccentric, substantiallyr as described.

In testimony whereof I have hereunto signed my name in the presence of two subscribing witnesses.

JOHN P'. wm's.

Vitnesses:

CHAS. MCC. CHAPMAN, M. I-IERsKovITZ.

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