US497631A - Rod-feeding device for turning-lathes - Google Patents

Description

(No Model.) 4

- l C.. M: GONRADSON.

ROD FB-BDING DEVICE POR TURNING LATHBS.

10.497,631; .Patented May 16,1893.

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UNITED STATES PATENT OFFICE.

CONRAD M. OONRADSON, OF MADISON, WISCONSIN.

ROD-FEEDING DEVICE FOR TURNING-LATHES.'

SPECIFICATION forming part of Letters Patent No. 497,631, dated May 16, 1893.

Application led November 28, 1892. Serial No. 453,421. (No model.)

To all whom. it may concern.-

Beitknown that I, CONRAD M. CONRADSON, a citizen of the United States, residing at Madison, in the county of Dane and State of Wiscousin, have invented certain new and useful Improvements in Rod-Feeding Devices, of which the following is a specification.

My invention relates to rod or stock-feeding devices for screw machines or similarmachinos employingA a hollow arbor, and consists in a novel construction of the same, as hereinafter set forth and claimed.

In the drawings,-Figure lis a side elevation, partly in section; Fig. 2, a horizontal sectional view on the line xof Fig. 1; and Fig. 3, a view illustrating a `slight modilica tion. j

A indicates a portion of the main frame, and B B nprights or standards thereon, carrying the hollow arbor C. The hollow arbor has at its inner end a conical collar D against which the inclined faces of the sliding jaws E act.

F indicates atube or sleeve mounted within the hollow arbor and arranged to move the jaws along the inclined faces of the collar, and

cause them to grasp or bite the stock Z. This tube or sleeve is provided with a circumferential groove a to receive the inner arms or ends c of the elbow levers G, which latter are pivoted in the hollow arbor, as shown in Fig. l; the said arbor being slotted as at b to allow the inner ends of the levers to project inward to engage the sleeve. The elbowlevers G,-of which there are preferably two,-have their tails d extending in the direction of the feed, and are designed to bear upon a collar H encircling the hollow arbor. This collar H is grooved circumferentially as at e to receive the studs f of the hand lever I which latter is pivoted in an arm or bracket J of the frame of the machine. When the lever I is moved so as to carry the collar` H beneath the vtails of the levers G, the latter will be rocked or tipped upon their pivots and move the tube or sleeve F forward. 'lhis movement of the sleeve causes the jaws E to ride along the intails of the levers G; and as the tails d are.

heavier than the arms c, the levers will be rocked, and, through their arms c, move the tube F backward and release the jaws.

In order to properly gage or determine the feed of the rod or stock, lemployaweighted arm K which is pivoted at a point between its ends to one of the uprights, the inner end of said arm being provided with an adjustable stop or bar g. At or near its pivotal point the arm or lever K is provided with an inclined heel h which is designed to be acted upon bythe sliding collar H. Now when the collar moves in such direction as to release the chuck jaws, it will strike the heel of the lever, rock the same upon its pivot, and bring the stop g into line with the projecting end of the stock (as shown in dotted lines) so that the latter cannot be fed any farther through the arbor than is permitted by the stop against which the stock will strike. If the collar H be moved in the opposite direction to cause the jaws to grasp the stock, the weight on the arm or lever K will throw the stop or bar g up out of line with arbor as shown in Fig. 1. From this it will be seen that the gage or stop is brought Iautomatically into position when- Y engage a worm wheel N, as shown in Fig. l.

This worm wheel is keyed to a shaft'O journaled in blocks or bearings P,-the said blocks P being supported on rods or barsQ, secured at one end to the main frame and supported at other points by feet R. Any -other suitable supporting frame may be substituted for that shown. j l .Y

Mounted upon the shaft O, between two collars S S, is a sprocket wheel T, which isidesigned to be held normally in engagement with the collars, by means of a coiled spring 1l, but which when meeting with a predetermined resistance will remain at rest while the shaft continues to rotate. The collar next to the worm wheel is secured to the shaft by a pin, while the other is keyed to the shaft so' that while it turns or rotates with the shaft,

it may also move toward and from the face of the splocket a limited distance. By varying the force or action of the spring, the point at which the sprocket will begin to slip or turn independently of the shaft and its collars, may be accurately regulated. A second sprocketj is mounted upon the supporting frame, in line with wheel T, and about these two sprockets a chain k passesf-the said sprocket wheels being separated a distance from each other, preferably equal to the length of the stock or rod to be fed through the arbor.

U indicates a traveling rod carriage or holder which in the present instance is shown as comprising a block Z adapted to move lengthwise upon the rods Q or other suitable supports, and having atits upper end a rotatable th-imblem and rod-clampin g screws a.

i The holder or carriage U is provided with a latch or hook owhich is designed to engage the chain la, so that when motion is imparted to the chain, the holder or carriage will also be caused to travel in the same direction.

The operation of this rod feeding mechanism is as follows: The hollow arbor is rofated, and, through the worm gearing, this motion is imparted to the shaft O. The spring t pressing upon the outer collar S holds the latter in contact with the sprocket T and causes the latter to turn with the shaft O. Motion thusimparted to the sprocket is transmitted through the chain 7c and latch o to the holder or carriage U in which the rear or outer end of the stock is clamped. The carriage being thus fed toward the chuck or main frame, feeds the rod or stock through the hollow arbor until the front end of the stock strikes against a gage or stop and prevents any further feed of the stock. Although the feed of the stock is stopped, the arbor, the worm wheel, and the shaft O, continue to turn or rotate, while the sprocket T remains at rest; the resistance offered to further feed of the stock exceeding the friction exerted by the spring t'. As soon, however, as the rod is ready to be fed forward another predetermined distance, it is only necessary to release the hold of the chuck jaws on the stock, whereupon (the resistance to the feed of the stock being removed) the friction produced by the spring t' will at once cause the sprocket to turn with the rotating shaft, and, acting through the chain, again feed the carriage U forward the predetermined distance. This step-by-step feed of the rod is repeated until the rod or stock has been mostly consumed. The latch o is then raised up outof engagement with the chain, and the carriage` U moved back to the outer wheel j by hand, preparatory to feeding a new rod or stock, and its hook or latch o engaged again with the chain. So far as the operation of this rod feeding mechanism is concerned,it is obvious that the special gage or stop K which I have herein shown and described, is not essential; any means which shall oi'er sufcient resistance to the feed of the stock being all that is required. For instance, the chuck jaws may themselves perform thisfunction.

In the construction shown in Fig. 3, I dispense with the worin gearing, chain, and sprockets, and employ a screw-shaft p which is journaled and turns freely in the frame P. The carriage or holder is provided with a threaded block or nut q which, fitting in a socket in the holder, engages the screw shaft and causes` a travel of the carriage as the shaft rotates. By withdrawing this nut or block q, the carriage can be moved back to startingposition. Under this arrangement the arbor is provided with teeth r to engage a pinion s mounted upon the end of the screw,-the said pinion being clamped between two collars t '5 by means of a coiled spring u. This mechanism operates in substantially the same manner as that illustrated in Fig. 1, andhardly seems to require further explanation.

I-Iaving thus described my invention, what I claim isl. In combination with an arbor and a rodgripping or chucking device carried thereby, a gage or stop to determine the length of the feed of the rod, and means operatively connecting the gage with the gripping or chuck- `ing mechanism; whereby when the chuck is actuated the gage will be brought automatically into or out of operative position.

2. In combination with an arbor andV rodgripping devices carried thereby; the pivoted lever K provided with a stop or gage g and a heel h; and the collar I-I, adapted to actuate the lever K and the rod-gripping devices.

3. In combination with a rotatable hollow arbor; a rod-supporting device in which the rod is clamped and which is movable toward the outer end of the arbor to feed the rod therethrough; and the intermediate connections between the arborand said rod-supporting device, whereby the arbor is adapted to impart to the rod a step-by-step travel or feed, substantially as shown and described.

4. In combination with a hollow arbor; a rod-holder movable toward the outer end ofthe latter to feed the material therethrough; means for resisting the feed of the rod; and gearing substantially such as shown and described for causinga travel of the rod-holder when the resistance to the feed of the rod has been removed or falls below apredetermined amount.

5. In combination with a hollow arbor; a rod holder to feed the rod therethrough; mechanism for causing travel of the rodhold er; and means for producing a resistance to the feed of the rod and throwing the holderactuating mechanism out of action.

6. In combination with a hollow arbor and a traveling rod-holder; a yielding feed mechanism for said holder; and means for producing sufficient resistance to the feed of the rod to overcome the action of holder-feed mechanism, all substantially as shown and described.

7 In combination with a hollow arbor and IOO IIO

9. In combination with the rotatable hollow arbor having Worm M; a shaft O p provided I5 lwith the worm wheel N and sprocket T; a

chainl k actuated from the sprocket; a slip connection between the sprocket and its shaft; and a rod-holder U adapted to be connected with the chain. l

In witness whereof I hereunto set my hand in the presence of two witnesses. t

' CONRAD lVL-CONRADSON. Witnesses: v

W. A. BAGLEY, C. H. ALLYN.

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