US278687A - darling - Google Patents

Description

(Nd Model.) 3 Sheets-Sheet 1.

H. M. DARLING 8: A KITZMILLER. SEWING MACHINE.

No. 278,687. Patented June 5,1883.

WITNESSES I INVENTORS N PETERS. Mol-Rhompher, Washington. DC,

, I 8 Sheets-Sheet 3. H. M..DARLING' 817 A KITZMI LLER.

(No Mbdel.)

SEWING MACHINE.

Patented Jun e 5,1883.

.WITNESSES N. PETERS, PholoLhl-w m m Washingion, 11c.

UNITED STATES PATENT OFFICE.

HENRY M. DARLING AND ARCHIBALD KITZMILLEB, OF CINCINNATI, OHIO, ASSIGNORS TO THE QUEEN CITY SEWING MACHINE COMPANY,-OF SAME PLACE.

SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 278,687, dated June 5, 1883.

' Applicationfiled March28, 1883. (No model.)

To all whom it may concern:

Be it known that we, HENRY H. DARLING and AROHIBALD KITZMILLER, both of Gincinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Sewing Machines, of which the following is a specification.

Our invention relates to that class of sewing-machines in which the shuttle-carrier is borne upon the end of avibrating arm moving horizontally beneath the table, and thus throwing the carrier through a curved path corresponding with an arc described from its pivot as a center. In these machines the inner end of the vibrating arm or bar is usually driven from the upper horizontal shaft of the machine by means of an eccentric upon said shaft, to which is strapped a lever passing down through the hollow bracketpost alongside the drivingbelt, and at its foot connected with the said vibrating arm by a telescoping section to compensate for the vertical play caused by the eccentric, and also interinediately pivoted to the post by a rod passing through a slot in the lever, also intended to compensate for this vertical play. tric will raise and lower the lever, but at the same time it will give it a vibrating motion on the shifting pivot, and thus will move the vibrating carrier-bar by means of the telescoping connection therewith. A needle and presser foot of any approved construction have of course been used, and also a feed-motion actuated in some convenient manner.

Our invention consists in actuating the feedmotion in machines of substantially the foregoing construction by connections with the horizontal vibrating bar and with the upright lever by which said bar is moved; in connecting with the horizontal vibrating bar a controlling device, whereby the vertical movements of the feed-block are determined in a novel governing device applied intermediate between the upright lever and the feed-surface which it drives, whereby the horizontal reciprocations of said surface may be varied in length and give a longer or shorter feed, and in the various other-devices and details of construction hereinafter pointed out and claimed.

In the drawings, Figure 1 is a side elevation, partly in section, of a sewing-machine Thus as the shaft turns the eccen I embodying our invention; Fig. 2, an end elevation, looking toward the face-plate covering the needle-box; Fig. 3, an end elevation in section from the driving-wheel end; Fig. 4, a bottom plan view; Fig. 5, a longitudinal section through the bed-plate and a portion of the mechanism for driving the feed-motion; Fig. 6, a transverse section through said bed-plate joint between the vibrating carrier-bar and the telescoping section of the upright lever which moves it.

. A is the bed-plate, and B the bracket, of a sewing-machine frame of approved construction. In bearings in the overhung arm of the bracket turns the driven shaft C, operating, as usual, the needle-bar D by slot and crank connection in the box at the outer end of said arm, or in any other suitable manner. Upon the shaft inside the hollow bracket, and vertically above the tubular aperture through its post or standard, is fixed an eccentric, E, connected by a strap, 0, with the upper end of a lever, F. At a short distance beneath the eccentric-say at about one-third the distance down the postis a pin, f, transverse of the bore of said post and secured in its walls at each side, and this pin may, if desired, be encircled by an anti friction sleeve or roller to more efficiently subserve its destined purpose as a pivot to the vertical lever through a slot, f, in which it passes. The revolutions of the eccentric will now cause a vertical play of the lever, carryshifting it upon the latter as allowed by the slot, and also a transverse vibration upon said pin as a pivot, throwing the lower end of the lever first toward one side and then toward the other of the machine. Beneath the bed-plate is a horizontal bar, G, secured thereto somewhat in advance of the post by a pivot pin or bolt, 9, which, as shown, may be slightly adjusted back and forth along 7 the bed-plate, to bring the end of the bar in 5 proper position at the forward end, or that nearest to the needle and presser-foot, to subserve its purpose. This bar is intended to carry the shuttle, and accordingly the bedsuitably cut away, to allow said shuttle a curved and mechanism, and Fig. 7 a detail of the 60 ing it up and down and along its pivot-pin, or

plate above its forward end, where the shuttle 10o from the pivot of the bar. The rear or inner end of the vibrating bar is to be moved inter mediately from the eccentric on the drivingshaft by means of the rising and falling lever connected to the latter, and is therefore split at such end and provided with cheeks a, to re ceive the spherical head f 2 of a small spindle, f telescoping into the lower tubular end of the vertical lever. When this spindle has been seated in position, a screw, passing through the two sections of the bar, clamps the cheeks together and makes the connection permanent, so that motion will be certainly transmitted as the eccentric revolves,notwithstanding the rise and fall of the connecting-rod from said eccentric.

N ow, in order to drive the feed-motion from the parts thus far described, we make use of the following mechanism, or practical equivalents thereof: A rock-shaft, H, is secured in bearings or hangers h beneath the bed-plate, and at its rear end provided with a lateral arm or crank, 71 having a longitudinal slot, 71 To the actuating-lever within the post, or to an offset from said lever, is pivoted the upper end of the link I, connected at its lower end, by means of a'pin, i, with the crank-arm from the rock-shaft, said pin taking into the slot in the arm. Intermediate between the two end connections the link has a shifting pivot composed of a pin, 2', taking into a longitudinal slot in said link and itself offset from a suitable lug or bracket, 5-, within the post. Thus as the aetu ating-lever vibrates and rises and falls with the motion of the eccentric it will lift and depress the link, which, guided by the slot and pin and acting through the slotted crank-arm, will vibrate the rock-shaft in its bearings to an extent determined by the point along the length of the crank where connection is made with the link.

Should no variation in the feed be desired, or should other devices than those hereinafter described be adopted for increasing or decreasing its extent, the joint between link and crank may be at a single pivotal point, in which case the crank need not be slotted, and the guide pin and slot controlling the motion of the link may be dispensed with. It will be understood, therefore, that said slotted crank and said guiding arrangement relate to the specific controlling instrumentalities shown and described, and are provided with reference to them. These instrumentalities consist simply in a sliding bar, K, moving in ways transversely beneath the bed-plate, and supporting at its inner end the bracket or standard which carries the guide-pin for the link. At the outer end this sliding bar passes beneath a slot made parallel of its own length through the bed-plate, and here receives the clamping-screw 70, by which it maybe set in or out along the slot, carrying the guide-pin toward one side or toward the other of the post, and moving the lower end of the link which it guides in or out along the slotted crank, shortening or lengthening the effective arm of the latter, thus increasing or decreasing the oscillation of the rock-shaft, while the rise and fall of the link remains unchanged, although its inclination is of course varied. At the outer end of the rock-shaft it is provided with a wrist-pin, h, and crankblock h upon said pin, which block, as the wrist-pin revolves, slides in a slot or way, Z, made transversely in one end of the feed-bar L, subtending the bed-plate in proper position beneath the presser-foot or needle-box in the bracket-arm, and supported at the end opposite said slot by a pin, Z, taking into another but longitudinal slot, Z in said end. To vary the starting-point of the feed-bar in its throw, leaving, however, the length of that throw to be determined by the means just described, the wrist-pin may be given a sufficient range of adjustment radially about the shaft, by means -of a setscrew clamping the hub of its supporting-disk firmly to said shaft, or by other suitable securing device. It is evident now that as the shaft H is rocked, the feed-bar will be reciprocated horizontally back and forth by the wrist-pin and crank-block to an ertentcorresponding with the oscillation ofthe shaft;

but as yet it will have little, if any, vertical motion, this being produced by other mechanism, such as is next to be described. Near the pivot of the carrier or shuttlebar it has an offset or enlargement, in which is pivoted a link, M. This link is intended to retain its horizontality at all times, though this necessity can be obviated by slight alterations, and its end is ,therefore received in a horizontal slot in the bar, and its pivot-pin m passes through into the material forming both walls of the slot. It is pivoted, as just stated, in an enlargement on the bar and eccentrically to the pivot of said bar, but as the eccentricity is the principal object, the purpose can be obtained-to a less advantageous degree, however-by pivoting in the main body of the bar at the requisite distance from the pivot of the latter to insure its being moved a proper distance. In the enlarged end of this link is a perforation receiving the spherical head a of a lateral arm or crank from a tubular shaft, N, sleeved upon the rockshaft H as a bearing. This tubular shaft extends to the forward end of the roek-shaft and bears in an annular groove in the hanger at that end, while at its rear end it is prevented from longitudinal displacement by a collar, a, fast upon said rock-shaft. At its front end it has fixed to it, by a clamping-screw or otherwise, a crank-arm, a which has alateral bend to take it around the disk 011 the end of the inclosed rock-shaft and immediately under the feed-bar. A link, n connects this crank-arm with a longitudinal slot in the feed-bar just in advance of the transverse slot for the wristpin and crank-block on the rock-shaft, so that in measure as the tubular shaft is oscillated by the vibrations of the carrier-bar the feed-bar will be raised and lowered at this end by the vibrations of the crank carrying the feed-sur- IIO face 0, which is attached to it in such manner as to be vertically adjustable up and down through the slot in the bed-plate or table.

The oscillation of the tubular shaft will take place' in such relation to theoscillations of the rock-shaft that the feed-bar will be raised at the moment the rock-shaft is driving it forward and held up through such forward movement, and will be lowered at the end of the forward stroke and during the return-stroke.

To make the action of the feed-bar at the front end correspond with the action at the rear end in a more perfect manner, and pre-J vent the upward and downward motion from partaking too much of apivotal character, the slot 1 in the front end of the feed-bar, instead of being entirely horizontal or longitudinal of said bar, may be inclined, as shown, so that this end will be gradually raised upon its guide-pin as the bar moves forward, and will in like manner sink as the bar is retracted. The distance to which the feed-surface proj ects through the bedplatein its forward movement, although determinable by adjustment of such surface upon the feed-bar, may likewise be in some measure determined by adjusting the crank m radially about the tubular shaft.

As has already been intimated, we do not confine ourselves to the precise mechanism herein set forth, considering that such a change may be made as to cause the actuating-lever in the hollow post to simply vibrate on its pivot without a rising and falling motion, when it may communicate with the link and rock-shaft through an elbow-lever or in some other suitable way, and, also, that while retaining the rockshaft and the tubular inclosin g shaft, other mechanism than that particularly described for oscillating them may be substituted in the machine, and that such alterations of detail as have hereinbefore been suggested may be found advisable or employed from mere choice.

Ve therefore claim- 1. The combination, substantially as hereinbefore set forth, of the feed-bar, the guide-pin taking through a slot in the front en d thereof,

a rock shaft having a wrist-pin taking into a transverse slot at the rear end of said bar and impelling it back and forth by its oscillations, and a second rock shaft having a crank arm link-connected with said bar in advance of the wrist-pin connection, and oscillating at such times as to raise the bar as it is advancing and lower it as it is receding.

2. The combination, substantially as hereinbefore set forth, of the feed-bar, the guide-pin taking into an inclined slot at the front end thereof, a rock-shaft having a wrist-pin taking into a transverse slot at the rear end thereof,

and a second rock shaft having a crank arm link-connected to said feed-bar immediately in advance of I the wrist-pin connection, whereby the feed-bar is advanced and retractedby the os cillations of the first rock-shaft, and raised and lowered by the action of the guide pin in its inclined slot at the front end and by the vibrations of the rock-shaft at its rear end.

3. The combination, substantially as hereinbefore set forth, of the feed-bar, the guide-pin passing through a longitudinally-trending slot at the front end thereof, the rock-shaft and its wrist pin taking into a transverse slot at the rear end of said bar' to give it its longitudinal reciprocations, and the tubular shaft inclosing the ro ck-shaft, and connected with the bar by a link to give it its up'and-down motion.

4. The combination, substantially as hereinbefore set forth, of the feed-bar, the rock-shalt by which it is moved back and forth, the longitudinally-slotted crank on said rockshaft, the rising and falling lever in the hollow bracketstandard, the longitudinally-slotted link connecting said lever with the crank, the guide-pin taking into the slot in the link, a sliding carrier for said guide-pin, whereby it maybe shifted from side to side to carry the end of the link in and out along the slot in the crank, and a fastening device to secure said carrier in its adjusted position.

5. The combination, substantially as hereinbefore set forth, of the feed-bar, the oscillating shaft by which it is given its vertical move ments, the vibrating shuttle-bar, and the link connecting said shuttle-bar with a crank-arm from the oscillating shaft.

6. The combination, substantially as hereim before set forth, of the feed-bar, the rock-shaft by which it is given its horizontal reciprocating motion, the tubular rock shaft inclosing the other, by which it is given its vertical movements, the vibrating shuttle-bar, the rising and falling lever in the hollow bracket standard,

actuating said shuttle-bar, the link-connection between said lever and the crank-arm from the first rock-shaft, and a second link connection between the shuttle bar and the crank arm from the tubular rock-shaft.

7. The combination, substantially as hereinbefore set forth, of the lever F, having arising HENRY M. DARLING. AROHIBALD KITZMILLER.

Witnesses:

FRANK W. BURNHAM, J. M. MORGAN.

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