US309140A

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Publication number: US309140A
Authority: US
Publication date: 1884-12-09
Anticipated expiration: 1901-12-09

Description

(No Model.) 3 Sheets-Sheet `1.

EN Hf PRETER.

' SCREW CUTTING MACHINE. No. 309,140. Patented Deo. 9, 1884.

H MES Il mw I l o o I F3 E N l wTTNEssEs: m INV/EMDR:

EL? BY C W ATTCENEYS..

(No Model.) 3 SheetsSheet 2.

E. H. FR'ETER'.

SCREW CUTTING MACHINE.

Patented'DeC. 9', 1884.

WITNESSES: Y INVENTOR: 2% BY VLLLUM/vv 4 MM 1^ @Q- ATTORNEYS.

' (No Model.) l 3 sheets-sneer. 3.

E. H. FRETER.

SCREW' CUTTING MACHINE.

Patented Deo. 9, 1884.

ATTORNEYS.

Unirse drames Parent trice.

EDUARD HEINRICH FRETER, OF ROEDELHEIM, NEAR FRANKFORT-ON-THE A MAIN, GERMANY. i

SCREW/CUTTING NIACl-HNE.

SPECIFICATION forming part of Letters Patent No. 309,140, dated December 9, 1884.

Application flcd July 25, 1883. (No model.)

To @ZZ whom it may concern:

Be it known that I, EDUARD HEINRICH FRETER, of Roedelheim, near Frankfort-onthe-Main, Germany, have invented new and useful Improvements in Screw-Cutting Machines, of which the following is a speciiication.

rlhis invention relates to a machine especially adapted for cutting screws.

Reference is to be had to the accompanying drawings, forming part of this spcciiication, in which similar letters of reference indicate corresponding parts in all the figures.

Figure l is a plan view of my improved machine. Fig. 2 is a longitudinal elevation of the same. Fig. 8 is a detail side view of the ratchet-wheel and eccentric pawl for operating the clutch devices. Fig. 4 is a detail face view of the chuck. Fig. 5 is a plan view of the sliding strips on the same. Fig. 6 is a face View of the cam'ioroperating the die-holder. Fig. 7 is a side view of the same. Fig. 8 is a c ross-sectionalelevation of the saddle and toolrest. Fig. 9 is a plan view of the under side of the same. Fig. l0 is a longitudinal sectional elevation'oi" wthe same. Fig. 1l isa detail side view of the lug on the die-spindle. Fig. l2 is adetail side View of the mechanism of the device for operating the gripping mechanism of the chuck. Fig. 13 is a plan and inverted plan ot' one of the catches for locking the spindle. Fig. Mis a detail view of the weight-and-pulley feed for the wire. Fig. 15 is a detail view of the lug on the die-spindle and the armed cam-shaft. Fig. 1G is a detail view of armed camshaft and the pivoied leafshaped latch. i

The hollow spindle A rests on the bearingblocks B, and forms a hollow head stock which can be revolved by means of belts passed around the stepped or cone-shaped pulley C, or directly from a motor. The eccentric disk D, mounted on the spindle A, terminates in a pawl, D, engaging with a ratchet-wheel, E, mounted ou a spindle, j, journaled` parallel with the spindle A in arms of the machineframe, so that the wheel E will be moved the distance of one tooth for every revolution of the spindle A. O11 the inner end of the spindle the chuck F is secured, which is shown in Figs. 4i and 5, the face-plate being removed, which face-plate has a central aperture through whichthe wire can be passed. A lever, 7i, is pivoted in a recess in the chuck, the recess being of such depth that the surface of the lever h will be Hush with the face or end of the chuck-block. At its pivoted end the lever h is enlarged to form a boss, having part of its edge iiattened. Vhen the iiattened part of the boss is over the sliding jaws b b, held in the chuck, the latter can be separated. Vhen the rounded part of the boss is over the jaws, the upper jaw will be pressed downward and the jaws will grip the wire between them. A lever, h, which is pivoted between lugs d, projecting from the rim of the chuck, is provided at its pivoted end with a toothed segment, h2. A half-ring, r, is held to slide on the rim of the chuck by the lugs d and a keeper, c, which half-ring is provided at one part with a laterally-projecting fork, g, and at one end with a series ot' apertures, o, or with teeth with which the teeth of the toothed segment h2 can engage, so that if the lever h is swung the half-ring i' will be moved in the direction of its length on the rim of the chuck, to operate the lever h and thereby the sliding jaws b. The tools are to be secured under the holders l-I, fastened on a slide-rest, G, the upper part, f, of which can be moved by means of a handle, k, and the entire slide-rest is movable transversely to the longitudinal axis of the lathe on the dovetailed saddle U.

On a shaft, J, journaled in the saddle U, a bevel cog-wheel, K, a grooved cam-sleeve, L, and the cog-wheel M are rigidly mounted.

From the bottom of the slide-rest G a pin, Z, projects into a groove of the cam L, so that a revolution of the latter causes the saddle to be moved transversely, according to the shape of the cam-groove. The cog-wheel M engages with a cog-wheel, R', and the motion of the latter is transmitted to the cog-wheels R2, R3, R, and P, the wheels R R2 R3 being mounted to revolve on pivots projecting from the lathebed, and the wheels RA1 and lJ being mounted on pivots projecting from the second adjustalole head-stock, B', asclearly shown in Fig. 2. When a revolution of the spindle A effects, by means of the pawl D, a partial revolution i of the ratchet-wheel E and shaftj, the motion is transmitted by the bevel oog -wheel K',

mounted on the shaft j, to the bevel cog-wheel IOO K, and to the wheel P, provided witlrthe cam P', and the short. shaft Z, having pins w, w', and 102, for operating the sliding bar O and the die-spindle W, hereinafter described. On the shaft J are mounted two cams, Q, which, when rotated, press upon two levers, R, pivoted to swing, and thus adapted to lift the pieces S, held to move up and down in the saddle U'. The pieces S are provided with small frictionrollers o' at their upper ends, and as soon as the pressure from the lever Bor the cams Q. respectively, decreases, the pieces S are pressed down by suitable springs. (Not shown.) When one or the other of the pieces S is lifted by its lever R, resistance is offered to the lever h orh, respectively, which rotates with the chuck` F, whereby the chuck is either closed or opened to grasp or release the wire-that is, it is closed when the lever h strikes against a piece, S; but when the lever h finds the resistance, the chuck is opened as the half-ring r is moved by the lever h', and the lever h, being between the prongs of the fork g of the ring r, is also moved, so that the pressure exerted by the lever l1, upon the jaws b bis taken off and the jaws are released. The chuck is opened to allow of the wire being pushed through it as soon as a screw is threaded and cut olf, and is closed as soon as sufficient length of material has been passed through lit for the next screw. The screw-cutting dies are in the spindle YV, which rests on the second head-block, B B', and is pulled forward in the direction of the arrow, Fig. l, by the screwcutting dies it carries in proportion as they cut the thread on the screw being made. The forward movement of the said spindle compresses the spring B, which serves to draw the spindle back to its original position as soon as the reverse motion imparted to the spindle from the pulley T has unscrewed the screw-dies from the finished screw. The pulley Tis mounted loosely on the said headblock B B, but is not movable endwise thereon.

y On the spindle Va pulley or friction-disk, V, provided with a sleeve, V, is mounted, which pulley is movable endwise, but is not free to turn on the spindle. The sleeve V is provided with' an annular groove, 0L, into which the shanks Yof a fork, m, pass, which is fixed to a parallel rod, O, adapted to b; moved to and fro longitudinally on a suitable rest, and is guided by slot-s p p.

From the under side of the rod O a lug, q, projects.

From the die-spindle NV a lug, t, projects, which lug is provided with the projection g. To the said lug tthe slotted plate g2 is adjustably secured.

u 'o are catches pivoted to a iixed support,

'and Aengaging the lug tand plate g2 of the spindle V, respectively, when the said spindle is in its normal position. Thecatch u is also pivoted to the rod O, so that' the said catch, when the rod O is pushed from right to left, will be moved away from under the lug t. The catch 'o is provided with the curved slot t', to receive the pin w of the shaft Z, and a projection, c2, to be engaged by said pin, for a purpose hereinafter described. The catch is also provided with a ilange engaging the slotted plate g2 on the lug t of the spindle'V. Vhen the catches u c engage the lug tand plate g', the spindle is preventedfrom rotating. The wire is fed into the hollow head-stock spindle A by the apparatus shown in Fig. 14. This feeding apparatus consists of a plate, 4, sliding upon rod 5, projecting' from the frame of the machine, and connected to a cord, l, which passes over pulleys 2 and has a weight, 3, attached to its end, so that as the plateis drawn along on the rod by theweight the wire will be fed into the spindle. On one slide-rest the shaping-tool is placed, and lon the other rest the tool for cutting off the nished screw is placed. The transverse, shaft J is common to both slide-rests, and the construction is similar in both, except that one part is without the cog-wheels M and K.

The operation is as follows: 1f the chuck F is open-fthat is, if the jaws b b are not pressed together by the lever h-the wire, the end of which has been shaped according to the desired length of the screw exclusive of the head, is moved forward by the feeding-device shown in Fig. let until it strikes against the cutting-dies on the spindle W. At this moment the pin w of the shaft Z moves in front of the projection g', which is' secured tothe die-spindle WV, as shown in Fig. 15, and pushes the same forward a little, and at the same time the wire'is pushed back to the exact length of the screw to -be made by the forward movement of the spindle. Then the corresponding piece Sfin the saddle Il, is lifted and offers resist-ance to the lever 7i, whereby the wire is grasped firmly by the jaws b in the chuck. The piece S then falls back to its normal position, and the slide-rest with the shaping-tool, is moved against the wire by the action of the grooved cam. Vhile the wire is being turned off to the required thickness for the next screw, the cutting apparatus is pressed rmly against the wire by means of the second and longer pin, w?, of the shaft Z engaging the projection g', so that the thread-cutting apparatus grasps the rotating wire, which screws itself into the cutting apparatus, and thus the thread and the head of the first screw are cut at the same time that the length of the next screw is turned, by means of the shaping-tool on the slide-rest. During the cutting of the thread the cuttingdies are pulled forward, and as the plate y? does not leave the catch o the latter still prevents the rotation of the die-spindle. When the thread is finished, the slide-rest, with the tool, having done its work, recedes, being moved by the cam L. In the meantime the pin @o of the shaft Z has entered the angular slot of the catch and c, by its engagemeht with the said slot and the projection 'o2 the catch o is carried away from the plate g2. At

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the same time the piece O is pushed forward by the action of the cam P of the wheel P, the projection of the cam pressing against the lu g Q. Thereby the friction-plate V is pushed into the loose pulley T, and the diespindle "W now rotates at a considerable higher speed than the head-stock A,as the pulley T is connected by a belt with the power-shafting or directly with a motor, and thus the completed screw screws itself out of the cuttingsdies, and the spindle XV is then drawn back into its former position by the spring B2. The cam of the wheel P has now passed away from under the projection of the parallel rod O, and this rod is also brought back into its former position vby a spring. The frictionplate V then releases the pulley T. The slot t in the catch c being curved, the latter will be slightly moved on its pivot in proportion as the pin w, attached to the shaft Z, passes through it during part ofthe revolution of the said shaft Z, as shown in Fig. 16. The pin w having left the slot 'o' of the catch o, the said catch o is pushed partly under,while its flange o2 is pushed partly over the lug t by a spring, Y, and the entire mechanism is in its former position.` The grooved cams,which cause the motion of the slide-rest, can be changed, if desired, and the movements of the slide-rests are thus varied according to the position of the groovedcams on the shafts. The projection q,secured to the die'spindleVJsadjustable to regulate the length of the screw-Unread, as the farther away from thchcad of the spindle XV carrying the screw-cutting dies thc projection g' is situated the sooner it will come in contact with the revolving pin w', and therefore the screw cut will be longer than if the projection g is situated nearer to the die-head.

4o The second head-stock, B B, is adjustable on the bed of the lathe, as is also the wheel R, through which the revolution of the wheel Rt is transmitted to the wheel R4, their relative positions to each other being determined by the length and size of the article being made. The longer the article the farther apart they have to be put; the shorter the article the nearer together.

Having thus fully described my invention, l claim as new and desire to secure by Letters Patentl. A screwcutting machine consisting of the hollow head-stock spindle A, in co1nbination with the pawl D, the chuck F, the sliding rests G G, the die-spindle XV, having the lug tand projection g, the loose pulley T, the friction-plate V, t-he parallel rod O, catches u and o, the ratchet-wheel E, the shaft j, the shaft J,tl1e bevcl`wheels K K', the cog-wheels M, R', it?, Pf, ql", and P, the latterbeing provided with a cam, and shaft Z, having proj ccting pins, substantially as set forth.A

2. In a screw-cutting machine,the chuck F, consisting of a circular piece having arecess, a, combined with a movable half-ring, 1, the levers It h, and the jaws b b, substantially as herein shown and described.

3. In a screw-cutting machine, theslide-rest consisting of the pieces j', G, G, and U, and the shaft J, combined with the bevel cog-wheel li, the grooved cam L, the cog-wheel M, the cams Q Q, the levers R, and movable pieces S, substantially as herein shown and described.

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

, EDUARD HEINRICH FRETER.

Vfitnesses:

FRANZ Hnssnncnnn, Josnrir PATRICK.