US1952841A - Apparatus for working metal - Google Patents

Description

March 27, 1934. cs. B. COE

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BY M ATTORNEY! M BMLL vww vnm Patented Mar. 21, 1934 PATENT OFFICE APPARATUS FOR WORKING METAL George B. Coe, New York, N. Y., assignor, by mesne assignments, to Tube Reducing Corporation, Wilmington, DeL, a corporation of Delaware Application December 19, 1931, Serial No. 582,025

26 Claims.

This invention relates to apparatus for working metal, more particularly to apparatus for reducing the cross-sectional area of stock in successive relatively short increments of length, and has for an object the provision of improvements in this art.

The full nature and object of the invention will be apparent to those skilled in the art from a consideration of the hereinafter-described specific embodiment of the invention given for purposes of illustration, reference being made to the accompanying drawings thereof, in which:

- Fig. 1, including the parts 1a and 1b, is a side elevation of the assembled machine;

Fig. 2, including the parts 2a and 2b, is a top plan view thereof;

Fig. 3 is a left or rear end view;

Fig. 4 is a right or front end view; n

Fig. 5, including the parts 5a; 5b and 5c, is a central longitudinal vertical section;

Fig. 6 is a transverse vertical section taken on the line 6-6 of Fig. 1;

Fig. 7 is a transverse vertical section taken on the line 7-7 of Fig. 1;

Fig. 8 is a longitudinal vertical section taken on the line 8-8 of Fig. 2;

Fig. 9 is a transverse vertical section taken on the line 99 of Fig. 1;

Fig. 10 is a horizontal section taken on the line 1010 of Fig. 1;

Fig. 11 is a partial transversesection taken on the line 11-11 of Fig. 1;

Fig. 12 is a partial elevation taken on the'line 12-12 of Fig. 1;

Fig. 13 is a vertical axial section taken on the line 1313 of Fig. 12;

' Fig. 14 is an enlarged partial section taken on the line 14--14 of Fig. 2;

Fig. 15 is a horizontal section-taken on the 0 line 15-15 of Fig. 14;

Fig. 16 is a view similar to Fig. 14 but smaller in size and showing the parts in a different position;

Fig. 1'7 is a partial section taken on the line 17l7 of Fig. 2; and

Fig. 18 is a partial section taken on the line 18--18 of Fig. 2;

The illustrative embodiment of the invention will be described specifically and in detail with ref erence to the drawings but without any intention of imposing any limitations whatever upon the scope of the invention by doing so.

This particular apparatus is intended for the reduction of tubular stock, so, as shown in Fig. 2, there are provided a mandrel M for supporting the stock S (Fig. 5c); mandrel turning mechanism MT seen at the rear or left end of the machine; a main drive motor DM; an auxiliary motor AM for returning the stock feeding means to an initial position; mandrel guide mechanism MG; stock feed mechanism SF which will be referred to as of the trip-feed type, meaning that it moves forward through a distance greater than the distance which the stock is fed forward at each action of the reducing devices before it is returned to initial position; mounting means for the reducing devices, which in this instance, is in the form of a reciprocating frame or saddle RF for swaging rockers R (Fig. 50); stock turning mechanism ST at the front end of the machine; and various other mechanisms and mountings associated with those which have been enumerated.

The entire assemblage of mechanism as shown in Fig. 1, is supported by a base frame 30 which 75 may be made in several parts or sections I if desired.

The rocker saddle is placed in vertical position instead of the horizontal position as is the usual practice with this type of machine. This places the axes of the rocker journals in a horizontalinstead of a vertical position; reduces the width of the machine at this portion where an operator is usually stationed; and places the rocker gearing at a position where it may be readily inspected and where it will not be filled with falling scale and dirt which would cause its rapid deterioration. The rocker saddle is reciprocated in balanced fashion by a pair of connecting rods 31 attached at their front ends to the saddle by journal pins 32 whose axes lie in a horizontal plane passing through the longitudinal axis of the stock and mandrel. At their rear ends (see also Fig. 10) the connecting rods 31 are driven by crank pins 33 secured to paired drive gears 34 on a main crank shaft 35. The gears 34 are in mesh with gears 36 on a worm gear shaft 3'7. The shaft 37 carries a worm gear 40 which is driven by a worm 41 fast on a worm shaft 42. The worm shaft 42 is driven by the motor shaft 43 of the main drive motor DM through a flexible coupling 44.

The motor shaft projects at its opposite end for a solenoid brake mounting or other equivalent device, not shown.

The reducing devices As best shown in Figs. 1b; 5c and 9, the reducing devices or rockers R are mounted in the frame or saddle RF upon heavy journals 45. The saddle 119 itself is formed as a closed rectangular ring of very strong metal to take the great strains "imposed upon it'when the rockers are working upon the stock. It is provided with .a relatively long tail piece 46 at its base and with slide ribs 47 which reciprocate'along ways 50 formed on the base frame 30. The slide ribs are retained and adjusted by an overhanging liner 51 with set screws 52 and an overhanging adjusting wedge 53 with set screws 58.

The rocker journals 45 are mounted in roller bearings 54 and thrust bearings 55. The roller bearings are carried in four separate bearing blocks 59 mounted for vertical movement in the saddle RF, the blocks being retained by plates 56 and spaced apart interiorly by studs 57. Caps 60 and a cooperating strip 61 together with suitable cap bolts of the same retain the thrust rings '62 for the thrust bearings in proper position.

The upper rocker bearing blocks are adjustable by wedges 63 and cooperating studs 64.

Means are provided for coordinating the action of the rockers. As seen in Fig. 9, the journals 45 at one end are provided with meshing gears 65 and 65, one of which 65' is longer than the other 65 and meshes with a fixed rack 66 secured to an upstanding bracket 67.

Means are provided for detachably securing the rocker dies R to the journals 45. As shown in Figs. 5c and 9, the dies are slid transverse'y into recesses in the journals along positioning splines or wedges 71 until they are firmly seated, after which retaining rings '72 are screwed up upon projecting arcuate flanges '73 formed on the dies. Locking rings '74 are then screwed up against the retaining rings. Grooves '70 are provided for assisting in machining out the recesses for the dies. This assembly provides ready removability of the rocker dies for replacement necessitated either by wear or for change of size, but at the same time holds the dies very securely.

As shown in Fig. 5c the rocker dies are provided with working grooves '75 of any suitable nature. For example, for round stock they may be made round in cross section and concentric about the journal axis where they last act upon the stock; and gradually flaring from round at the edges in cross-section and eccentric about the journal axis where they principally work upon the stock to reduce it. The journals may be provided with notches 76 at either end of the rocker grooves to provide clearance when the rockers are in extreme positions.

A cooling medium, which may also have lubricating properties, is served to the rockers by means of pipes '77 which, as shown in Fig. 9, are connected to a flexible section '78 supplied with fluid from the source. Fluid leaves the bottom of the saddle through a hole 80 and enters an elongated trough 81. From the trough it is returned to the source by a pipe 82.

M andrel mounting and turning mechanism Means are provided for holding the mandrel at desired longitudinal positions and turning it in coordination with the action of the reducing devices. This mechanism is shown at the left end of the machine. Referring to Fig. 5a, the mandrel M at its rear end is splined and notched to engage a removable sleeve and a latch bar 86 respectively.

, The sleeve 85 is splined within the hub 8'7 of a gear 90, the clearance within the hub 8'7 being adequate to permit the passage of the largest size stock which the machine will reduce. The

gear may be maintained against endwise move--' ment by a bushing 91anchored within a tail piece 92. The gear is driven periodically in accelerated and decelerated fashion by a gear 93 fast on a turn shaft 94 driven through a train of gears 95, 96, 9'7, from a clutch shaft 101. Instead of driving through gears 97 and 100, the parts may selectively be driven at a different speed through gears 102, 103 mounted respectively on the shaft 101. and the jack shaft 104 which carries the alternate gear 97. The gears 100 and 102 are loose upon the shaft 101 and are driven selectively through the clutch collar 105 which is slidably splined upon the shaft. When driving through the gears 102, 103 the mandrel is turned each time through an angle of 60degrees and when driving through the gears 100, 9'7 the mandrel is turned 90 degrees. The clutch collar is actuated by a yoke lever 106 fast on a shaft 107, the same being operated (Fig. 1) by a hand lever 108. f I

The latch bar 86 is held within a swingable latch member 110 pivoted to the tail piece 92 (see Fig. 3) by a hinge pin 111. The latch member is held on either side against axial movement by upstanding parts 112. The mandrel is backed up at its end by an abutment member 113 retained upon the latch member 110 by a bolt 114.

The entire tail piece may be shifted longitudinally by a screw 115 having collars 116 engaging a depending arm 117 of the tail piece and threaded within a nut 120 held between upstanding ribs 121 of the main frame 30.

The turn and feed gearing Referring to Fig. 3, the shaft 101 for turning the mandrel has fast thereon a Geneva disc 122. This disc is driven by a Geneva arm 123 fast on a Geneva shaft 124. The shaft 124 carries an elliptical or eccentric gear 125 meshing with a similar gear 126 on a turn-feed shaft 127.

The gear 126 is also in mesh with another elliptical gear 130 fast upon a Geneva shaft 131 employed in certain feed mechanism to be described. The shaft 131 carries a Geneva arm 132 thereon which meshes with a Geneva disc 133 fast on a shaft 134.

The Geneva arms 123 and 132 for turn and feed respectively are in opposite phase so as to cause turning at one end of the rocker stroke and feeding at the other. This is the preferred order but it may be changed if desired.

The Geneva gears and associated shafts are mounted upon a separately detachable frame 135 which may be readily removed with the parts mounted thereon. The shaft 127 for this purpose is provided with a coupling 136 and the shafts 101 and 134 are removable by sliding movement from their gears, collars and bearings.

The shaft 127 extends forwardly to a clutch 13'7 operated by a shift lever 140 on a shaft 141 by which both the turning and feeding mechanisms may be thrown out of action, as will be described hereinafter.

The forward clutch shaft 127a is driven by a transverse shaft 142 through bevel gears 143, 144 and this shaft, in turn, is driven (Figs. 1 and 10) by a gear 145 thereon from one of the gears 34 on the main crank shaft 35.

Stock turning mechanism The mandrel turning mechanism has already been noted. This may also serve for turning the stock, especially when working according to the preferred cycle of operations wherein the stock is gripped upon the mandrel at the time it is to be turned. It is desirable, however, and at times requisite that the stock be turned by means acting directly thereupon. Herein means are provided for turning the stock as it is being fed to the reducing devices and other means are provided but associated with the first means for turning the stock as it emerges from the reducing devices. The latter serves the additional function of preventing free or uncontrolled movement of the finished stock after it leaves the first feeding and turning means which feeds the stock into the reducing devices.

Referring first to the rear turning means, as shown in Figs. 2a, 5a, 17 and 18, the stock is gripped by a pair of friction lined jaws 150 replaceably inserted within chucks 151 pivoted between a pivot pin 152 and the retaining walls of a chuck head 153. A plate 154 (Fig. 5a.) and bolts 155 retain the chucks in position on the chuck head. Some or all of the bolts may also provide spacing means to allow free action of the chucks. The chucks, as will be later explained, serve also as feeding means for the stock, and may be securely clamped by a double threaded screw 156 operating within nuts 157 which engage the free ends of the chucks. A removable socket wrench 160 may be employed for operating the clamp screw 156. A hardened backing plate 161 is inserted in the head 153 to take the reaction of the stock on the chucks.

The chuck head is rotatably mounted in a feed frame 162, a liner 163 being employed to take wear. The frame 162 is retained upon extended ways on the main frame 30 by retaining plates 164 and cap bolts 165.

On its rear end the rotary chuck head is provided with a. gear 166 in mesh with and driven by a gear 167 rotatable in and slidable with the feed frame 162 but keyed for sliding movement upon its driving shaft 94 previously referred to. In this manner the turning mechanism will be operated no matter what the position of the feed frame may be.

The forward turning means may be operated by the mechanism shown in Figs. 1b, 2b, 4, 5c, 12 and 13. In Figs. 1b and 2b it may be seen that the intermittently driven turn shaft 94 extends forwardly and at its front end is provided with a gear 170. There is gearing provided for driving the forward turning mechanism from this shaft. This may be of any desired character but preferably is of such a nature and is so located as not to obstruct the saddle and mandrel.

Accordingly the gear 170 on the shaft 94 drives the gear 171 on a stub shaft 172. This shaft also carries a bevel gear 173 meshing with a bevel gear 1'78 fast on a vertically inclined shaft 174. At its lower end thisshaft through meshing bevel gears 175, 176 drives a horizontal shaft 177, the latter in turn through bevel gears 180, 181 driving a front vertical shaft 182, this shaft again in turn driving a front rotatable chuck head 183 through bevel gears 184, 185.

As best shown in Fig. 13 this chuck head 183 is hollow for the passage therethrough of stock and is rotatably mounted in bearing standards 186, 187.

At its. rear end the chuck head is enlarged to receive replaceable friction jaws 190 and corresponding wedges 191 which are held after insertion within flanges 192 of the frame by a split spring ring 193.

Cooperating with the wedges 191 to close the jaws 190 are a corresponding number of wedge fingers 194 formed upon a wedge ring 195 slidably ,but non-rotatably mounted upon the head 183 by means of a key 196.

The wedge ring is slid to and fro by means of a collar 200 relative to which the ring is rotatable. The collar, and consequently the ring, are moved by a shift fork lever 201 mounted upon a shaft 202.

As shown in Fig. 1b, means are provided for engaging and releasing the finished stock by the forward turning mechanism at any desired time. This being provided, the rotation of this turning mechanism may be continuous with the rotation of the other turning mechanism and the mechanism will function whenever the stock is engaged. The shaft 202 is provided with an am 203 actuated by a link 204 from a lever 205 mounted upon a pivot 206. A rod 207 is pivotally connected to one end of the lever 205 and to the lower end of 'a hand lever 210. The lever 210 is secured to a cross shaft 211 upon the other end of which, if desired, another lever (not shown) may be secured.

Means of an adjustable character are provided for locking the band lever in stock gripping position. In the form shown, the lever 210 is provided with an integral latch prong 212 having a hardened face plate 213 which engages the rear side of a latch plunger 214 when the lever prong is moved backwards. At other times the plunger, which is pressed upward by a spring 215 rides under the lower end of the prong.

The latch plunger and spring are mounted in an adjustable slide 216 mounted in an arcuate guide 217 formed in a fixed bracket 220 secured by cap bolts 221 tothe side of the main frame 30. The upper end of the bracket 220 is offset from the side of the main frame to accommodate the lower end of the lever 210 and the rod 207. The arcuate guide 217 is concentric about the axis of the lever shaft 211.

The slide 216 is adjusted by a screw 222 swivelly attached thereto at its end, the screw being adjustable in a swivel nut 223 by a hand wheel 224. The swivel nut is pivotally mounted in the fixed bracket 220.

The latch plunger may be pulled down when desired to release the lever by a foot pedal 225 pivoted to the slide 216 at 226 and to the plunger 214 by a clevis 227.

In operation, when the upper end of the hand lever 210 is thrown forward the jaws 190 are engaged with the stock and since they are turning constantly cause the stock to rotate. However, the push of the rockers and feed devices (by an abutting new length of stock, it may be) is sufllcient to force the stock through the jaws in spite of their clamping action. The hand lever is held forward by the latch plunger 214 until the latter is withdrawn by the foot pedal 225. The adjustment of the latch position by the screw 222 provides for the degree of gripping desired and accommodates different sizes of stock.

Feeding gear a 1 It has already been explained by reference to Fig. 5a and other views how the stock is clamped at its rear end in the feed frame 162. Referring to Figs. 2a and 17, a feed shaft 230 is threaded through the feed frame and by rotation causes the frame to travel along its ways. Both the turn shaft 94 and the feed shaft 230 are retained in the feed frame by a cap 231.

Means are provided for giving the feed frame a series of intermittent rapid movements in a forward direction to feed the stock and a continuous rapid return movement.

Referring to Figs. 6 and 8, the shaft 230 at its rear end is mounted in ball bearings 232 and thrust bearings 233. It is provided with a gear 234 by which it is intermittently rotated tofeed the stock and a sprocket gear 235 by which it is turned selectively by the motor AM and the sprocket chain 236 to return the feed frame. A clutch collar 237 slidably splined on the shaft 230 and operated by a yoke lever-240 fast on a clutch shaft 241 serves to transfer the drive between the gear 234 and the sprocket gear 235.

The gear 234 is driven by a gear 242 and that, in turn, by a gear 243 on the offtake shaft 244 of a speed change gear 245 of any suitable type. The speed change gear is used to vary the rate at which stock is fed to the reducing devices. The intake shaft 246 (see also Fig. 1) is keyed to a clutch collar-247 adapted to drive a gear 250 which is rotatably mounted upon the shaft 246.

. The gear 250 is driven by a gear 251 fast on the shaft 134 previously referred to as being driven through Geneva and elliptical gearing from the tum-feed shaft 127.

Means are provided for shifting the feed clutch collar 247 and the feed-reverse drive collar 237 either manually or automatically, the latter being effected )when the feed frame has been returned to its rearmost position. This position is manually established to conform to the length of stock being fed.

Referring to Fig. 1a, the clutch collar 247 is shifted by the yoke lever 251 pivoted upon a fixed journal 252 and latched in clutch engaging position by a hand operated detent 253. The lever is, however, not latched in the clutch disengaging position. By an integral arm 254 and a connecting rod 255 the hand yoke lever 251 is interlocked with the automatic mechanism and the hand operated mechanism which is located near the front end of the machine.

The rod 255 is provided with nuts 256 and passes through a slot in a toggle lever 257. At one end the lever 257 is attached to a mating toggle lever 260 pivoted to a fixed journal pin 261, and at its other end is attached to an arm 262 fast on the clutch shaft 241 which shifts the feed collar 237 between forward and reverse positions.

Connected to the'central joint of the toggle links is an operating link 263 which at its other end is attached to a counterweight 264 pivoted upon a fixed journal 265. Whereas the link 255 connected with the change speed clutch is adapted to actuate the toggle in only one directionthat for reverse feed-the link 263 is adapted to actuate the toggle in eitherdirection.

On its rear face the counterweight is provided with an extension 266 and a. stud pin 267 for engagement with the vertically slotted eye member 270 attached to a notched bar 271.

The bar extends forward and at its front end is attached by a clevis 272 to a manual shift lever 273 provided with handles 274, 275 for operation from either side of the machine. The lever is pivoted at its center upon the journal 276.

The bar 271 is provided with a plurality of notches 277 and corresponding holes 280 for positioning a dog 281. The dog is adapted to be engaged by a striker member, 282, attached to the feed frame SF, when the frame reaches its rearmost position for which the dog 281 has been set. As shown in Fig. 1, the dog is set in the last notch of the bar for the longest length of stock.

In operation, the two clutches are engaged for Means are provided for throwing the main power drive off of the feed and turn mechanism when the feed frame reaches its forward position. This is supplemented by manual control means. As shown in Fig. 1, there is a hand shift lever 283 pivoted at its lower end to the main frame. An automatic shift lever 284 pivoted at 285 has its upper end located where it will be struck by the feed frame. The lower end of the lever 284 is bifurcated to engage a pin 286 fixed in the hand lever 283. A shift rod 287 at its front end is attached to the lever 284 and at its rear end is attached to the joint pin 290 of a pair of toggle links 291, 292. The upper link 291 is pivoted upon a fixed journal 293 while the lower link 292 is pivoted to an arm 294 fast on the shaft 141 of the power clutch 137 previously referred to.

M andret guide means Means are provided for guiding and supporting the mandrel. Preferably this means is extensible to follow up the feed frame as this moves forward, which movement otherwise would leave the mandrel unsupported.

Referring to Figs. 2a,, 5a, 7, 11, 14, 15 and 16, a plurality of traveling guide frames 300 are slidably mounted on the same ways and are held down by the same means as is the feed frame. Only two such guide frames are shown but there may be as manymore as are needed or desired.

The guide frames are provided with bushings 301, 302 for the turn shaft 94 and the feed shaft 230, these shafts being free to turn and slide in the bushings. Friction shoes 303 are mounted in sockets in guide levers 304 to engage or very closely surround the mandrel. The levers 304 are mounted upon journals 305 secured in the guide frame. The upper ends of the levers 304 are shaped to cooperate with a cam 306 mounted upon a. journal 307 and are spread apart to close the shoes together by a handle .310. The levers are urged in the opposite direction to open the shoes 303 by plungers 311 acted upon by springs 312. A depending lug 313 on the handle 310 holds the handle in proper position to maintain the cam 306 in the horizontal position as shown in Fig. 11.

The guide frames are caused to shift positions as required in any appropriate manner. Inasmuch as the movement of the feed frame leaves the mandrel unsupported it is most logical to have this move theguide frames into position, and this scheme is adopted here. Referring to Figs. 14 and 15, the feed frame is provided with a stud 314 adapted to engage a slotted bar 315 which is attached to the leading guide frame by a stud 316, and to move the guide'frame forward after the feed frame has moved forward a given distance.

Similarly, the next guide frame is moved forward after the first guide frame has moved a predetermined distance by a slotted bar 317 engaged by the stud 316 of the first guide frame and anchored to the second guide frame by a stud 320. A spacer 321 of the same thickness as the first slotted bar may be placed upon the stud 320 beneath the secondslotted bar.

By this mechanism the guide frames are moved up behind the feed frame at given distances apart to guide or support the mandrel and prevent buckling or whipping action therein.

Operation Assuming that the machine" has reduced a previous length of stock and that it is stopped for the introduction of a new length of stock, there will be a short length of stock left between the rockers; and the feed frame 162 as well as the mandrel guide frames 300 will be in their rearmost positions. These positions will depend on the length of stock which is being reduced and the corresponding position at which the trip dog 281 on the notched bar 2'71 is set. The latch bar 110 (Fig. 5) is raised to release the mandrel M and the splined sleeve is removed from the mandrel to permit the introduction of a new length of stock over the rear end of the mandrel. At this time the feed jaws 150 (Fig. 18) and the friction shoes 303 (Fig. 11) of the mandrel guide mechanism are positioned away from the mandrel axis to permit the stock to be pushed forward along the mandrel.

The new length of stock is now introduced and moved forward until its rear end is between the feed jaws 150, after which the jaws are closed, the friction shoes 303 are closed upon the mandrel, the sleeve 85 is replaced, the latch bar 110 is lowered to engage the mandrel, and the machine is started into operation.

The feed frame 162 moves forward intermittently under the action of the feed shaft 230, and the mandrel and rear length of stock are intermittently rotated under the action of the turn shaft 94. The short remaining lengthof stock is pushed forward by the action of the new length of stock upon its rear end and is urged to turn with the mandrel on accountof its frictional engagement therewith. If left to these devices alone the forward length of stock might have some free or uncontrolled movement, so in order to avoid this the forward stock turning mechanism is brought into use. Since the chuck head 183 (Fig. 13) is already in rotation, it is only necessary to close the friction jaws 190 upon the finished portion of the stock in order to turn it by direct action thereon. As already explained, while these friction jaws grip the stock sufficiently to turn it and resist its free forward move-- ment, they nevertheless permit the stock to be moved forward without injury under the action of the feed mechanism.

The friction jaws are closed by moving the upper end of the lever 210 (Fig. 1b) forward. It may be held in gripping position by the latch plunger 214, the position of which may be ad-'- justed, as described, by the screw 222. When the stock is to be released, as, for example, when the remnant of stock has been finished and the new length of stock well started into the reducing devices, the foot pedal 225 is depressed to withdraw the latch plunger 214, thus allowing the lever 210 to be returned to the releasing position. a

As the feed frame 162 moves forward it su cessively entrains the mandrel guides 300 at intervals by action of the slotted bars 315 and 317.

When the feed frame arrives atthe forward end of its travelit operates the shift lever 284 (provided the hand lever 283 has not been operated to the same purpose already) and dis engages the main power clutch 137 to stop the feed and turn mechanism. The same action may also stop the operation of the saddle actuating means-the only part left in operation after the clutch 137 is disengaged-as by stopping the main drive motor DM, or this may be done by hand if desired. The hand lever 251 (Fig. 1a) is now moved forward aboutits fixed pivot 252 to disengage the gear change clutch 247 and to shift the clutch 237 (Fig. 8) forward for-driving the feed shaft 230 by the gear 235 and the auxiliary motor AM. The same action may also start the auxiliary motor, or this may be done by hand if desired.

At this time the feed jaws have been opened to release the stock and the auxiliary motor returns the feed frame rapidly to its rearward position.

When in its rearward travel the striker member 282 on the feed carriage comes against the dog 281 it moves the notched bar 271 rearwardly (if this has not already been effected by lever 273) and throws the counterweight to the left about its pivot 264. This throws the speed change clutch 247 into operative position and moves the clutch 237 rearwardly to drive the feed shaft 230 through the gear 234 for intermittent forward-drive movement.

This automatic action produced when the feed frame reaches its rearward position may also 105 stop the auxiliary motor and. start the main power motor, if desired. The feed-turn clutch 137, may be reengaged by the hand lever 283 after a new length of stock has been introduced to start the machine into operation.

The clutch 105 (Fig. 5a) is operated only when it is necessary to change the angle of turning of the mandrel and stock. Here it may be noted that while the double throw clutches 105 and 237 are shown in their mid-positions in Figs. 5a and 8 respectively they are not normally left in this position at any time but are disposed on either one side or the other.

While one embodiment of this invention has been described in detail for purposes of illustration, it will be evident that other embodiments may be produced and that the invention is not to be limited except by the prior art and the scope of the subjoined claims.

What I claim: 7 1

. 1. In apparatus for reducing stock, in combination, reducing 'devices acting intermittently upon relatively short increments of stock length, means for feeding a length 'of stock partially through said reducing devices, means for turn- 13a ing said stock as it is being fed, and means for turning said stock after it has passed beyond the range of said first feeding and turning means, said second turning means including constantly rotating means and selective stock engaging 13 means.

2. In apparatus for reducing stock, in combination, reducing devices acting intermittently upon relatively short increments of stock length, means for feeding and turning the blank stock, 140 means for turning the finished stock, said means including releasable friction jaws, and means for clamping and releasing said jaws at any desired time.

3. Apparatus as set forth in claim 2 in which 1 5 said clamping means includes a hand lever and an adjustable latch for holding the lever in clamping position.

4. Apparatus as set forth in claim 2 in which said clamping means includes a hand lever. an 1

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