US75023A - John thomas jones - Google Patents

Description

@Minh gister, getest @frn JOHN THOMAS JONEa4 or NEW YORK, N. vfAssIeNon V'ro 'rr-in'sINena MANUFACTURING COMPANY, OF SAME PLACE.

Letters Patent No. 75,023, dated March 3, 1868-.

rMPROVBMBNT 1N remmer-DRIVERS.,

TO ALL WHOM IT MAY CONCERN:

Be it known that I, JOHN THOMAS JONES, ofthe city, county, and State of New York, have invented certain new and useful Improvements in Friction-Drivers, foi-converting `reciprocating motion` into rotary motion, and that the following is a full, clear, and exact description and specification of my said improvements.

The object of the invention is to enable the direction in which the wheel (or other instrumentality that is caused to revolve) is driven to'be readily reversed, and also to equalize the amount of movement in opposite directions. e

To. these ends, the rst part of the invention consistsof the combination of the hub or rim, appertaining tothe article to b'e driven, with a friction-clamp, two rocking-cams, and two levers, proiecting at thcsamc side of the hub and operating the cams, so that by operating one lever the friction-clamp is caused to drive the hub in one direction, while by operating the other lever the direction of driving is reversed.

The second part ofthe invention consists of the combination of the said hub, friction-clamp, rocking-cams, and lovers, with a reciprocating-driver, which may bo engaged with either of the two lovers, so that the( directie of movement of the hub may be reversed bytransferring said driver from one lever to the other.

The third part of the inventior consists of the combination of the said hnb,t `rictionclamp, cams, levers,

and reciprocating driver, with a transfer-rer and a gauge for determining the distance to'which the reciprocating driver is moved when transferred from one cam-lever to the other, whereby the amount of reversed movement imparted to the hub after transferrence may be made equal to that imparted before the transferrence of the driver.

The fourth part of the invention consists of the combination of the hub and friction-clamp with a'roekingcam, lever for operating the' same, reciprocating driver, gauge for regulating the position of the same, and holding-mechanism for holding the driver in the position in which it is placed, so thdt when the driver is set to impart a certain movement to the hub, the driver. will be held in the position inwhieh it is so set,.and the motion imparted will remain unchanged until some alteration is made by the operator.

The improvements thus set forth may be applied to various purposes, one o'f the most important of which is'the movement o'f the feed-wheel of sewing-machines; and in order that my invention may be fully understood, I will proceed to describe such an application of it, referring to the accompanying drawings, and to the gul'es and letters of reference marked thereon- Figure l representing a transverse section of the bed-plate of a sewing-machine with my improvements 1Applied tothe feed-wheel thereof, i

Figure 2 representing a plan of the machine, and

Figures 3 and 4 representing views of detached parts of the mechanism.

The feed-wheel Q, to which the improvements1 are applied, is constructed to revolve upon a-{xed arbor, r3, and has a hub, q, to which lthe frictionclamp R, is fitted.. The formof friction-clamp which is represented is forked, its `two arms, 1 r1, partially embracing the hub q, and, the rocking-cams S S being arranged at; the

crotch of the arms, so that when a cam is borne against the hub the ends ofthe arms r1 r1 are drawn' towards the cam, and the hub is held at three places where the cam and tho extremities of the arms bearupon it. One of the cams, S, is arranged to rock in a circular socket formed in the friction-clamp R. The other cam, S1, is arranged to rock .vin a circular socket formed in the rst cam, so that two rock upon the same axis, while each has u nipping-face, s and s3, which, when, the cam is rocked in one direction, is borne against the hub g and nips it. The nipping-faces s2 sa of the two cams are at opposite'sides of their common axis, so'that one cam, S, nips the hub when rocked in one direction, (as indicated by the arrowa., in g. 3,) while'the other cam, Sl, nips the hub when rocked in the opposite direction to the first. Each cam is fitted with a lever, T and T', by which it is rocked; and a pin, a2, is projected from the friction-clamp in such a. position relative to theoperating-levers that each lever strikes said pin after it has rocked its cam, so as to release the nip von the hub, and that the. continued movement of the lever (after such release) causes the frictien-clamp R to -turn upon the hub g to the position atwhich it is-to gripe the hub preliminary to imparting .a succeeding movement to it. lThehub q has a' friction-brake, X, ttedto it, to prevent retrograde' motion while either lever is rocking its cam to release the hub andmove the friction-clamp after' such release. One of the levers, T', is fitted with a spring, IL., that bears upon the other, T, and causes the two slightly to diverge, so that when one cam is operating the other may not interfere with its action.

In order that both levers, T T', may be operated by the same driver, they are arranged nearly in the same radial line, (to the axis of the hub 11,) and are slotted in opposite directions, so that the 4driver may be moved radially out of the slot m of one lever, T, into the slot m1 of the other, andm'ce versa; The driver consists of val pin, v, which projects from a. slide, U, that is tted lto move in a slotted head, U', to which an oscillating. movement'is imparted by securing it to the end of a rock-shaft, P. Consequently, the driver is caused to reciprocate by the'oscillation of the head U'. The axis of the rock-shaft P is arranged opposite the place at which the adjacent ends of the slots m 'ml of the operating-levers T -T' meet each other, so that when the driver v is on one side of said axis it operates in connection with one lever, T, and when it is on the other side of said axis it operates in connection with the other lever, T'. As-the slottedhead U' is, in this example, caused t0 oscillate to the same extent at all times, the distance which the driver is moved by any one oscillation depends upon its radial distance from the axis of the rock-shaft, and the greater the distance the greater the movement.-

I Hence, by changing the distance of the driver from the axis of the rock-shaft, the extent oi' movemenLof the lever, (upon which the driver acts,) the extent to which the friction-clamp It is moved, (by the lever,) and the.' extent to which the hub g is turned, (by the movement of the friction-clamp) are all changed.

. In order' that the driver may be conveniently moved, either for 'the purpose of transferring it from the lever T of one of the cams to that, T', of the other cam,`or for the purposeof changing theposition of the, driver relatively'to the lever it is operating, so as to vary the 'extent .of movement, a transferrer, B', is provided. This transferrer consists of a linlgwhich ,is connected at one end-with the driver v, and 'at the other with a vibratable handle, C', so that by moving said handle on its pivot d', the driver v may bc-moved to they required position. The distance towhichthe driver is moved is determined by al gauge, E', consisting of a stationaryplate with an inclinededge, against which. the end of a screwpin,f','(that is connected with the handle C',) abuts, sons to stopthe movement of. the handle and transferrer'at the desired place. Asvth'e gauge is used for determining the distance to which the driver is to be moved when transferred from the slot of one lever, T, to that of the other, T',it has two inclined edges,n1 n2, presenting a V profile, and as the slot rn" of one of the levers, T', is nearer theaxis of the hub gthan that of the other, T, and consequently requires a less change in the positionrof the driver 1J -than the other slot does, to produce an equal difference of angular movement in the levers, the two edges rtl-n2 of the gauge are inclinedl at different angles, so as to correspond with the diiierence in the extent to which thel driver is to be moved to-produce equal angular movements of the two leversl(and consequently of the friction-clamp) in opposite directions. The position of the screw-pin f"is regulated by turning the handle C', which also forms the head of the screw ;l and a pinch-nut, g", isA provided to secure the screw-pin in any desired position.

In order that the -transferrer B', and 7censeltluently'the driver v, may be held in their positions,- a springlocking mechanism is providcd.- This mechanism consists of a spring-piston, H', and a heart-shaped cam, G', the latter being connected with the stock F' of the vibrating handle C' of the transferrer B', and the formerl being secured to the stock of the gauge E'. The piston H' is pressed towards the asis of the cam by a spring, and its head is V-formed, so that the cain is forced away from the central line of the piston-head, whether the cam be at one side or the other thereof. The point of the cam G' is opposite the ap'ex ofthe piston-head when the driver is in its central position, or isopposite the axis of the roch-shaft I. Hence', when the driver is at either side of such central position, it is heldu there by the piston, which, acting upon the cam G', holds the screw-pin f" against the gauge E'. 'i

-The holding-mechanism will perform its function, when used in 'connection with one lever and one cam, without the other lever and its rocking-cam, and may be used advantageously in combinationrwith one lever und one cam when it is not deemed expedient te have a second rocking-cam and. lever' to 'reverse the movement of the feed-wheel. i

Having thus described one applicationof myimprovements, what Iclaim as my invention in frictiondrivers, and desire to secure by Letters Patent, is I The combination of the hub, friction-clamp, two rocking-cams,A and two operating-levers, arranged at the .same side 'of thehub, substantially as before set forth. I i

' Also,-the combination ofthe hub,lfrictionclamp, two rocking-cams, pp'erating-levers, and reciprocating driver, substantially as before set forth.

Also, the combination of the hub, friction-clamp, twofrocking-cams, operating-levers, reciprocating um, transferrer, and gauge, substantially as before set forth.

Also, the combi'nationef the hub, rocking-cam, lever, reciprocating driver, trnnsierrer, gauge, and holdingmechanism, substantially asbefore set'forth.

'In testimony whereof, I have heretoiset myha'nd, this twenty-fourth day of December, A.,D. 1867.

` I J. T. JONES.

Witnesses:y

W. L. BENNEM, J, RArnBoNE, Jr.

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