US2680391A

US2680391A - Apparatus for working metal

Info

Publication number: US2680391A
Application number: US242261A
Authority: US
Inventors: Karl B Kaiser
Original assignee: Ingersoll Milling Machine Co
Current assignee: Ingersoll Milling Machine Co
Priority date: 1951-08-17
Filing date: 1951-08-17
Publication date: 1954-06-08
Anticipated expiration: 1971-06-08

Description

June 8, 1954 K, B; KAI-SER 2,680,391

APPARATUS FOR WORKING: METAL Filed Aug. 17, 1951 10 Sheets-Sheet 1 June 8, 1954 K. B. KAISER 2,680,391

APPARATUS FOR WORKING METAL Filed Aug. 17, 1951 l0 Sheets-Sheet 2 (J -vrowuonx/ June 8, 1954 Filed Aug 17, 1951 K. B- KAISER APPARATUS FOR WORKING METAL 10 Sheets-vSheet s may June 8, 1954 K, B, KAISER 2,680,391 APPARATUS FOR WORKING METAL Fiid Aug. 17. 1951 loxs'heet-sheet' 4 .TENVENTOM,

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APPARATUS FOR WORKING METAL Filed Aug. 17, 1951 10 Sheets-Sheet 9 IMvsIa-rov=- adcur I o 1 PW/Wr TTO'QNEY June 8, 1954 K. B. KAISER APPARATUS FOR WORKING METAL 10 Sheets-Sheet 10 Filed Aug. 17, 1951 Y5 @Ceul Jae;- 647 r-ac amsw Patented June 8, 1954 UNITED STATES PATENT OFFI CE APPARATUS FOR 'WOR'KING'META'L Karl JB. Kaiser, Rockford, 111., .assig-nor to The rI-ngersollMilling Machine Company, Rockford, 111,, .arcorporationof 'Illinois Application August 1 7, 1951, Serial No. 242,261

8-Glaims.

This invention relates to apparatus :for working the metal of elongated bars such as tubes to reduce the cross section thereof and correspondingly lengthen the :bars.

Heretofore, such rolling out of "the metal of the bars has been efiected-"by cams or rolls .having vacant sectors which when disposed opposite the tube or bar .zpermit periodic :endwise feedin by which anew length of .Joar is presented to the rolls. In the iso-icalled pilger mill, the rolls are vjournaled-on =:a stationary frame which is advantageous in view of the rugged mounting required but disadvantageousin that the rolls are idle for half of eachzrevolutionduring which the bar is fed forwardly. ;In the so-called tube reducing process, :"greater :production :is achieved by mounting the rolls on 'a carriage which is reciprocated back-and :forth :along :the stationary work bar so that the rolls may-work the metal in both of their oscillating .=mov.ements. :This method requires a costly machine structure for guiding the roll carriage, necessitates reciprocation ofa heavy mass, iandcomplicates the procedure of changing the rolls.

The primary object of "the :present invention .is to providea bar reducing apparatus which nombines all of the advantages and overcomes the disadvantages of the two Lmeth'od's above .referred to.

Another object is to provide :a :novel mechanism for reciprocating the work bar, ioscillating the rolls, :and .intermittently feeding the work in synchronism while permitting the rolls .to he mounted in a stationary .frame.

A more detailed object LiS'ZtO reciprocate the work back and forth .and at the same time 2170 utilize the work 'reciprocatinns as ea source of power for oscillating the working rolls whack-and forth.

The invention also aims to achieve the foregoing object through thefimounting of'the intermittent work feeding mechanism :on thereciproeating work carriage.

Other objects and-advantagesof the invention will become apparent Ffrom the ffollowing detailed description taken in connection with the accompanying drawings, .in which Figure 1 is a fragmentary :side elevational view of a metal workingmachinemodyingtthe novel features of the present invention.

Fig. 2 is a fragmentary sectional view taken along the line ;2-:2 ofil 'igsl.

Fig. 3 is a fragmentary across section through the rolling dies and the-workpiece.

Fig. 4 is a iragmentary sectional view taken .2 tional views taken respectively along the lines 5--:5, 6-6 and l-:'| o-f L'E'ig. 4.

Figs. 18., :9 and .11) :are zfragmentary cross-sectionalviews taken along the lines 18-8, 9-3 and I'D-1:0 of Fig. '1.

.Fig. 11 is .a fragmentary longitudinal sectional view taken along the line 'H-:l..l of Fig. :9.

vFig. 121s .assectional view taken along the line l2-':I'.-2 of :Fig. 11.

Figs. I3 :and 14 areschematicplan views showing .the parts :at the right and left .hand -ends of the machine shown inFig. .1.

Figs. 7 15 through 18 are schematic views :illustrating the action :of'the work feeding mechanism.

.Fig. 119 ?is airagmentary=sectional view taken along the line l9l9 of Fig. 9.

.'Fi'g.:-20;is a fragmentarysection :taken along the linen-2B of Rig-16.

'Whi-le :the invention .is "susceptible of various modifications .and .alternative constructions, I have shown in "the drawings and will herein .describe in detail the preferred embodiment. It is to be understood, however, that 1. do not intend :to limit theinvention by such=disolosure, zbut aim to cover all modifications and alternative constructions falling within the spirit and :scope of the :invention .as expressed in the appended claims.

f'I he invention is shown :for purposes of :illustration incorporated .in :a .machine .ifor reducing the diameter, both inside vand'outside, :of a metal tube J!) .:by the .cold .iforging action thereon ao'f semicircular rolls 4| journ'aled in a .stationary frame 12 -at one end :of a "be'di'iS which carries the power iiriven mechanisms for ireciprocating the work tube, periodicallyieedingdzhesame-endwise inshort increments, turning the :tubestep by :step, iand i oscillating the rolls .1 i.

In general, ithe trailing mend iportionl'o'f the tube is fastened through a gripper 1 5 and .an :intermittently :acting feed mechanism H5 '(Fig. 4) to a carriage 'l il islidable bao'k :and forth along the bed to Lreciproc'atefthe work tubeand correspondingly oscillate the rolls t: back and for th abetween the l-imi t positionsshown in @Figs. 11:5 rand 16. :After the active roll surfaces a'have passed out -of engagement with the workz at the end :of the retraction of -the latter, the l feed mechanism is actuated to-advance the work -a -shorlt distance relative to thecarriage topresent-5a newponti'on of the tube to :the rolls. -Also, =at-each end of the carriage stroke, the tribe is turned through a partial revolution-to present any Ifiash 'forme'dat the junction *ofthe two roll surfaces to-lce rolled away'in the next stroke.

-A'mandrel F8 disposedwithm the tube-between the rolls I l projects outwardly through the trailing end of the tube H! where it is detachably fastened to the carriage H and held against axial movement relative thereto. Where it is desired to reduce the internal as well as the external work diameter, the mandrel is tapered as indicated at l9 (Fig. 3).

The rolls I l are grooved as shown in Fig. 10 to straddle opposite halves of the work tube and each axial section has a gradual cam rise 28 extending over somewhat more than a half revolution so as to leave a vacant sector on one side of the roll permitting endwise advance of the work tube when the rolls are positioned as shown in Figs. and 18. The rolls are fast on suitable shafts 2 l journaled in bearings supported in the side walls of the frame I2. Preferably, each roll is backed by a roll 22 also supported in the frame l2.

The carriage H by which the work is reciprocated back and forth is slidable in heavy guides 23 (Fig. 2) formed along opposite sides and on the top of the bed i3. Power for reciprocating the slide is derived from a motor 24 (Fig. 13) mounted in the bed and, through speed reduction gears 25, drives two gears 26 which carry crank pins 21 joined by connecting rods 28 to an oscillating arm 29 pivoted at 3%! (Fig. l) on the bed iii. The latter is of substantial width and at its free end is formed with spur teeth Elli meshing with the teeth of a rack 3| secured to the under side of the carriage ll. During operation of the motor, the gear segment 29 is rocked back and forth and the carriage moved correspondingly along the ways 23.

In accordance with one aspect of the present invention, the reciprocatory motion of the carriage I! is utilized directly to oscillate the rolls l l in opposite directions in accurate synchronism with the back and forth movements of the work tube It. Herein, the motion converting mechanism includes a link 32 (see Fig. 14) pivoted at 33 on the forward end of the carriage l i and pivotally connected at 3 to one end of a rack bar 35 which is slidable in guides 35 formed on the base part of the roll frame [2 (Fig. 10). A pinion 31 journaled on the frame 22 meshes with the teeth of the rack 35 and also with'a gear 38 fast on the lower roll shaft 2 1. Another gear 38 on the shaft 2! meshes with a gear 39 on the shaft of the upper roll. As a result, the rolls turn in the 4 tube or allow expansion of the jaws to release the tube. The tube 52 is journaled in bearings 55 at opposite ends of a hole 56 extending through a slide 40 concentric with the tube.

A second device 51 (Figs. 1, 8 and 14) is adapted to grip the reduced end portion of the work tube ID beyond the rolls l I and apply a torque for assisting the gripper IS in turning the tube while permitting the tube to slide endwise therethrough as it is elongated in the rolling operation. This auxiliary gripper is mounted on a frame 58 and direction indicated by the arrows in Fig. 14 while the carriage ll isadvancing to the left and in the reverse direction while the carriage is moving in the opposite direction.

Mounted on the carriage ill and movable relative thereto in guideways 4| formed thereon parallel to the ways 23 is a slide ll] on which the tube gripper I5 is journaled. The ways 4! are long enough to permit movement of the slide through a range somewhat greater than the length of the tubes In to be operated on. The trailing tube end (see Figs. 6 and 20) is received in a ring 42 having angularly spaced inwardly opening recesses 43 receiving jaws 44 which abut against the tube end. The conedexternal surfaces of the jaws fit into complemental surfaces 45 on a ring 45. Through thrust washers 41, the latter ring abuts against an inturned flange 48 on a collar 49 screw threaded at 50 onto a nut 5i threaded onto the end of a tube 52 having spur teeth 53 formed thereon. By applying a spanner wrench to holes 54, the collar 49 may be turned relative to the nut 5| and moved axially causing the internally coned ring 46 to collapse the jaws 44 around the work includes a slide 60 (Fig. 8) guided along ways 59 and connected to the forward end of the carriage I! by links 6| disposed along opposite sides of the roll frame 22.

Extending through and journaled in an elongated bearing 60 in the slide 613 is a sleeve 62 held against axial movement by thrust washers B3. A ring 64 surrounding the sleeve 62 and sliding along a key 65 thereon is urged axially by springs 66 which act against a nut E! threaded onto the sleeve to adjust the spring tension.

The outer end of the ring 64 bears against the free ends of angularly spaced radially disposed arms 68 pivoted at their inner ends on pins 69 carried by the sleeve 62. Outward swinging of the arms 58 is limited by adjustable stops F0 on the slide 50. Swingable on pivot pins H on the arms 68 and projecting inwardly therefrom are angularly spaced jaws 12 whose inner ends project through holes 13 in the sleeve 62 and bear against the exterior of the work tube Hi, the reduced end portion of which extends axially through the sleeve. The pins H are radially spaced outwardly slightly beyond the pins 69. It will be seen that the jaws 12 are always urged into frictional gripping engagement with the tube It by the action of the springs 55 on the arms 53 and are thus adapted at all times to transmit rotary torque to the tube [0. At the same time, however, and by virtue of the relative radial spacing of the pivots 69 and ii, the jaws l2 and the arms 68 on which the latter are carried are yieldable outward by rocking of the arms 68 away from the stop i0 and against the action of the springs 56. This permits endwise shifting of the engaged part of the tube Ii! through the sleeve 62. Such shifting occurs during the step by step forward feeding of the tube and also as a result of the elongation of the tube which accompanies the reducing action of the rolls H. The forward end portion of the sleeve 62 is fluted as indicated at T5 and spline coupled to a gear 78 journaled in bearings Ti in a part 18 which is bolted to the top of the frame 58 beyond the range of reciprocation of the gripper 51.

A turning moment derived from the motor 2 5 is applied periodically to the grippers l5 and 5! to rotate the tube 10 through part of a revolution, usually about of a revolution, while the surfaces of the rolls H are out of engagement with the tube end of each stroke of the carriage ll. For this purpose, a shaft 19 (Figs. 1, l3 and 14) carrying the carriage drive gears 25 is connected by bevel gears 80 to a horizontal shaft 81 journaled on the bed IS. The shaft 8| (Fig. 14) is bevel geared to a shaft 82 carrying a cam 83 which'acts on a follower 84 to swing an arm 85 about a pivot 86 a distance determined by the rise of the cam. The rocking motion of the arm 85 is imparted to the driving pin 8'5 of a ratchet or other type of one-way clutch 81 by which a gear 88 is correspondingly turned. Through a suitable gear connection 89 and a shaft t9 mounted on the bed l3 and the frame 58, this motion is transmitted in the proper direction to the gear 76 by which the gripper 51 is turned. The cam shaft 82 makes one revolution during each forward and return stroke of the carriage IT and the cam 83 is shaped to advance the shaft 90 one step while the rolls I I are out of engagement with the tube I at the end of each carriage stroke.

In a similar way, the motion is applied in the proper direction to a shaft 90 (Figs. 13 and 14) journaled on the bed I3 and spline coupled to a gear 9| meshing with the gear 53 by which the gripper I is driven. The shaft 90 is extended further along the bed and, at its rear end (Fig. 13), is splined into a gear 92 journaled on the bed I3 and meshing with spur teeth on the exterior of a ring 93 (Figs. 11 and 13). The latter is journaled in bearings 94 on an extension 99 of the carriage I1 and held against axial movement by thrust washers 95. The ring gear is formed with internal teeth 96 meshing with teeth on the exterior of a drive ring 91 slidably keyed at 08 onto the longitudinally grooved rear. end portion Ii; of the mandrel I8.

Means is provided for holding the mandrel solidly against endwise movement relative to the carriage I'I during the tube reducing operation while permitting step by step turning of the mandrel and also endwise withdrawal of the latter preparatory to inserting a new work tube. Herein, this means includes a spool I00 (Fig. 11) journaled on a sleeve IOI and clamped by a nut I02 between thrust members I03. The sleeve in turn is clamped between nuts I04 threaded onto reduced portions of the mandrel.

Projectable into and out of the groove of the spool I00 are plungers I05 (Figs. 9 and 11) guided in ways on the carriage extension 59 and shaped at their inner ends to fit closely around the spool. Rack teeth on the outer ends of the plungers mesh with gear segments I06 pivoted at I0'I on the extension 99. The free ends of the segments are pivotally connected at I08 to a link I09 which is joined to a rod II 0 slidable vertically in the extension 99. The rod carries a piston III movable in a stationary cylinder II2. By admitting pressure fluid to the upper and lower ends of the cylinder, thrust sustaining plungers may be moved out of and into the groove of the spool I00 to lock or release the mandrel. When the plungers are withdrawn, the mandrel with the spool and the ring 97 thereon may be withdrawn rearwardly through the hollow ring gear 93. V

If desired, such withdrawal may be effected by a power actuator of the type shown in Figs. 11 and 12 and including a non-circular tube II3 surrounding the rear end portion I8 of the mandrel and clamped by a nut II I against the ring 9?. Teeth I 55 formed along the upper side of the tube are adapted to receive between them the tapered end III; of a plunger II'I normally urged into the locking position shown in Fig. 11 but withdrawable by energiz'ation of a solenoid H8. The lunger is slidable in an extension II9 on a slide I20 which loosely surrounds and guides the tube H3 and itself is guided in ways I2I on another extension I22 of the machine bed I3. A lug I23 on the underside of the slide I20 is coupled to an endless chain I 24 extending around sprockets I25 one of which is on a shaft I29 adapted to be turned through a slip clutch connection I26 with a gear IN. The latter may be rotated by hand or, as shown diagrammatically in Fig. 12, by a reversible electric motor actuator I28.

When the actuator is energized in one direc- 6 tion after release of the thrust plungers I05, the slide I20 with the mandrel I8, the ring 91, and the 'spool I00 coupled thereto are drawn rearwardly along the bed ways I2'I far enough to The mechanism I '6 above referred to operates to feed the tube I0 forwardly intermittently in timed relation to the reciprocations of the carriage II and irrespective of the position of the slide 40 along the carriage. To operate reliably under the heavy forces involved, this mechanism is of rugged construction and adapted to act positively. It comprises generally screws I30 (Figs. 4 to 7) mounted on the carriage I! and rotating continuously to advance the slide 40 in one direction relative to the carriage and a cam device I3I (Figs. 4 to 13) mounted on the slide and rotated continuously to advance the gripper I5 relative to the slide in the opposite direction so as to neutralize the screw motion during the time that the work is engaged by the rolls II while advancing the gripper I5 to feed the tube when the rolls are out of engagement with the tube at the end of the forward stroke of the carriage II.

Referring to Figs. 4 to 7 and 15 to 19, the screw I30 is duplicated on opposite sides of the slide 40 and threads through nuts I32 secured in opposite ends of bores I33 through which the screws extend parallel to the axis of the work tube. The screws are somewhat longer than the lengths of the work tubes I0 and at their rear ends are journaled in bearings I34 (Fig. 19) on the carriage IT and firmly held against endwise movement by heavy thrust washers I35. Fast on the rear ends of the screws are worm wheels I39 meshing with worms I3? (Fig. 13) on a crossshaft I 38 journaled on the carriage and connected through interchangeable pick-off gears I39 with a shaft I00. A train of bevel and spur gears I4I rotatably mounted on the carriage Il extends from the shaft I40 to a gear I 42 splined on a shaft I43 journaled on the bed I3 and connected through a worm and worm wheel I44 to a drive shaft I05. This'shaft maybe driven by an electric rapid return motor I46 or from the main motor driven shaft 8i through bevel gears I4? and a one tooth clutch I 43 having jaws which interengage in only one angular position of the drivingand driven parts which may be engaged and disengaged by axially shifting the clutch collar I49 by any suitable means (not shown).

The screws and their drive'connections are so constructed that in each stroke at of the carriage I1, the slide will be advanced relative to the carriage a distance a (Fig. 15). In a complete cycle or during both forward and return strokes of the carriage, the slide is advanced a distance b (Fig. 16).

In the present instance, the positively acting cam device I3! comprises two open face cams I50 (Figs. 4 and 13) disposed on opposite sides of and acting against rollers l5I on a follower lever I52 fulcrumed intermediate its ends on a in I53 on a casing I54 secured to the top of the slide.

- The cams I50 which rotate in planes paralleling the work axis are keyed to shafts I55 journaled in the casing I54 and carrying gears I56 which are joined by bevel gears. I51 to a spline shaft (58. This shaft projects rearwardly from the slide 45 and at its end is adapted to be coupled by a one tooth clutch I59 to a gear I66 which is driven through suitable gearing IGI from the shaft I43. The clutch may be engaged and disengaged by a hydraulic actuator I62.

The other or inner end of the lever I52 is forked as shown in Figs. 6 and '7 to straddle a collar I63 having trunnions I64 thereon projecting through holes in thelever. The collar is disposed between thrust washer abutments I65 on a sleeve I66 keyed to but slidable along the sleeve 52 above referred to. Heavy coiled springs I61 acting in compression between abutments on the sleeves 52 and IE6 serve asslightly yieldable cushions between the cams and the gripper I actuated thereby.

The cam shafts I55 are timed to make one complete revolution during one cycle of reciprocation of the carriage I'I. At the end of the forward stroke of the carriage and after the work tube It has been fed forwardly by the cams I50, the parts will be positioned as shown in Figs. 4 and 15, one follower roller l5i engaging the high point of the forward cam I50 and the low point of the other cam. -Now, during retraction of the carriage IT and the work tube to the position shown in Fig. 16, the screws I30 move the slide progressively and forwardly relative to the carriage I? a distance a and at the same time the cams I56 turn clockwise through a half revolution rocking the follower lever I52 progressively to the perpendicular position shown in Fig. 16 thus retracting the gripper I5 relative to the slide 46 an amount indicated at b and equal to the distance a, the parts then being positioned as indicated in Fig. 16.

Advance of the slide 49 by the screws continues in the next or forward stroke of the carriage I"! by a distance e during which the counterclockwise rocking of the follower lever I52 is continued by the gradual rise of the forward cam I50 and a corresponding fall in the rear cam. The gripper i5 is thus further retracted relative to the slide a distance I equal to the distance e. The parts are then positioned as shown in Fig. 17, the rollers II having passed out of engagement with the work tube 20. .The sharp rise I'iil (Fig. 4) of the forward cam and the corresponding fall l'II of the other cam are then presented to the follower rollers I5I in the final part of the cam revolutions thus shifting the lever I52 quickly in the reverse or clockwise direction from the position shown in Fig. 17 to that of Fig. 18. The gripper 55 is thus projected forwardly relative to the slide 49 a distance g, and the work tube is fed forwardly through the rolls II to bring a new length h of the unreduced tube into operative association with the rolls. The-cycle of reciprocation of the carriage is now complete, and the parts are again in the starting position above assumed.

Operation The operation of the machine as above described may be summarized with reference to Figs. 15 to 1'7 assuming that the carriage I1 is fully advanced and the work tube has been fed forwardly as shown in Fig. 15. As the carriage moves backwardly and to the right, the rolls II turn in the direction indicated in Fig. 15 into engagement with the work at the unreduced diameter thereof and, in the continued movement, roll out the metal progressively to the reduced diameter. This results in an elongation of the leading end portion of the tube beyond the rolls which is permitted by the one way action of the gripper 5? as described above.

At the end of the backward stroke of the carriage, the rolls will have passed out of engagement with the tube as shown in Fig. 16. Thereupon, the cam 83 acts through the one way clutch 81' to turn the shaft through one step and thereby apply to both of the tube grippers I5 and 5'! and to the mandrel I8 a torque for turning the same usually through about one seventh of a revolution.

Now, as the carriage I1 and the work tube are pushed in the next stroke, the rolls II are turned reversely as indicated in Fig. 16 and engage the tapered portion of the tube progressively to further roll out the metal of the tapered part of the tube. As the carriage reaches its forward limit of travel (Fig. 17), the rolls pass out of engagement with the tube and the cam 63 again operates to turn the tube grippers I5 and 5'! and the mandrel I8. At the same time, the cams I59 operate as described above to feed the gripper I5 and the tube forwardly through the distance g (Fig. 18) thus presenting a new length of the tube to the rolls and completing the machine cycle.

Successive cycles are repeated until the trail ing end of the tube has reached a predetermined position at which the machine is stopped preparatory to inserting a new tube. To accomplish this, the gripper I5 is released manually, both of the one tooth clutches 849 and I59 are disengaged, and the motor I26 is started in a direction to retract the mandrel IS out of the tube it a distance somewhat greater than the length of the new tube to be inserted. Next, the rapid traverse motor I46 is started in a direction to cause the screws I36] to retract the slide 46 and the gripper I5 relative to the carriage IT a distance sufficient to enable the new tube to be inserted in the latter which is then tightened. The motor I46 may be operated reversely until the leading end of the new tube comes into abutment with the end of the partially reduced tube.

By operating the motor I28 reversely, the mandrel I8 is next moved axially through the new tube and until a stop I30 (Fig. 11) on the ring 9? moves with the mandrel slide I I3 and encounters the end of the gear 93. The tapered end of the mandrelwill then be positioned accurately in the proper position between the rolls II.

After reengagement of the clutches I49 and IE9, the machine may be restarted. 1n the ensuing cycles of the machine, the leading tube is urged backwardly by the action of the rolls I I and thus is always held in proper abutment with the leading end of the new tube.

I claim as my invention:

1. In a bar reducing machine, the combination of, a stationary frame, a carriage guided for reciprocation on said frame, means on said carriage for fastening one end portion of a work bar thereto for movement back and forth with the carriage, forging rolls journaled on said stationary frame to receive the other end portion of the supported bar, power operated means for reciprocating said carriage back and forth, a rack bar connected to said carriage and projecting past said rolls, gearing interconnecting said rolls and the teeth of said rack bar and operable to osoil-late said rolls in opposite directions and back and forth during reciprocationof said carriage, mechanism mounted on said carriage for movement therewith for holding the work bar positively against endwise movement and operable when actuated to positively feed the work bar forwardly relative to the carriage, and means connecting said power operated means and said mechanism and operable while said carriage is disposed near the endof its forward stroke to transmit a positively measuredincrement of movement of said power operated means to said feed mechanism.

2. In abar reducing machine, the combination of, a stationary frame, a carriage guided for reciprocation on said frame, means on said carriage for fastening one end portion of a work bar thereto for movement back and forth with the carriage, forging rolis journal'ed on said stationary frame to receive the other end portion of the supported bar, a power rotated drive shaft, means driven by said shaft to reciprocate said carriage back and forth, a rack. connected to said carriage and reciprocating'therewith, gearing on said frame interconnecting said rolls and the teeth of said rack and operable to oscillate said. rolls in opposite directions and back and forth during reciprocation of said carriage, mechanism including a rotary member mounted on said carriage and operable by its rotation to feed the work bar forwardly relative to the carriage, a shaft spline coupled to said rotary member and extending along said carriage, and means driven from said drive shaft and operable to turn the spline shaft one step while said carriage is disposed at each end of its range of reciprocation.

3, In a bar reducing machine, the combination of, a stationary frame, a carriage guided for reciprocation on said frame, a gripper rotatably mounted on said carriage for fastening one end portion of a work bar thereto for movement back and forth with the carriage, forging rolls journaled on said stationary frame to receive the other end portion of the supported bar, a power rotated drive shaft, means operated thereby to reciprocate said carriage back and forth, gearing interconnecting said rolls and said carriage and operable to oscillate said rolls in opposite directions and back and forth during reciprocation of said carriage, mechanism mounted on said carriage and operable to feed said gripper forwardly relative to the carriage while the latter is disposed at the end of its forward. stroke, a second gripper movable with said carriage and engageable with the reduced end portion of the work bar beyond said rolls, said second gripper having jaws movable to' permit of endwise elongation of said bar by said rolls, and means driven by said drive shaft and actuated intermittently and at the end of a stroke of said carriage to turn both of said grippers.

i. In a bar reducing machine, the combination of, a stationary frame, a carriage reciprocable back and forth in ways supported by said frame, a slide mounted on said carriage for reciprocation relative thereto parallel to said ways, a gripper for clamping the trailing end of a work bar and mounted on said slide for movement relative thereto parallel to said ways, metal working rolls journaled on said frame to receive and operate on the forward end portion of a bar clamped in said gripper, a power rotated drive shaft, means driven from said shaft for reciprocating said carriage, means for converting the reciprocatory motion of said carriage into oscillatory motion of said rolls, a screw threading into said slide along the path of reciprocation thereof and retatably mounted on said carriage, means driven from said shaft and turning said screw con-tinuously to advance said slide relative-to said carriage, a lever fulcrumed on said slide andconnected to said gripper to shift the same back and forth parallel tosaid ways, and cam mechanism rotated in synchronism with said screw and operable through said lever to positively retract the gripper relative to said slide duringthe return and forward strokes of said carriage and advance the gripper while the carriage is at the end of its forward stroke, the rate of retraction of said gripper by said cam mechanism being equal to the rate of advance of said slide by said screw;

5'. In a bar reducing machine; the combination of, a stationary frame, a carriage reciprocable back and forth in ways supported by said frame,

a slide mounted on said carriage for reciprocation relative thereto parallel to said ways and through a range greater than the length of. a work bar to be reduced, a gripper for clamping the trailing end of a work bar and: mounted on said slide for movement relative thereto parallel ;to said ways, metal working rolls j'ournaled on said frame to receive and operate on the forward end portion of a bar clamped in said gripper, a power rotated drive shaft, means driven from said shaft for reciprocating said carriage, means for convertingthe reciprocatorymotion of said carriage into oscillatory motion of said rolls, a screw threading into said slide along the path of reciprocation thereof and rotatably mounted on said carriage, means driven from said shaft and turning said screw continuously to advance said slide relative to said carriage, a rotary cam mechanism mounted on said slide and driven continuously from said drive shaft, and a follower positively actuated by said cam mechanism operable to advance and retract said gripper relative to the slide, said cam mechanism being shaped to retract said gripper progressively relative to the slide during the retraction and advance of said carriage at the rate of advance of said slide by said screw and at the end of the carriage advance to feed said gripper forwardly relative to the slide.

6. In a bar reducing machine, the combination of, a stationary frame, a carriage reciprocable back and forth in ways supported by said frame, a slide mounted on said carriage for reciprocation relative thereto parallel to said ways, a gripper for clamping the trailing end of a work bar and mounted on said slide for movement relative thereto parallel to said ways, metal working rolls journaled on said frame to receive and operate on the forward end portion of a bar clamped in said gripper, a power rotated drive shaft, means driven from said shaft for reciprocating said carriage, means for converting the reciprocatory motion of said carriage into oscillatory motion of said rolls, means driven from said shaft and operable continuously to advance said slide relative to said carriage, and a rotary cam mechanism driven continuously from said drive shaft and operable to retract said gripper progressively relative to the slide during the rectraction and advance of said carriage and, at the end of the carriage advance, to feed said gripper forwardly relative to the slide, the rate of retraction of said gripper by said cam mechanism being equal to the rate of advance of said slide by said last mentioned means.

7. In a bar reducing machine, the combina- 11 tion of, a stationary frame, a carriage reciprocable back and forth in ways supported by said frame, a slide mounted on said carriage for reciprocation relative thereto parallel to said ways and through a range greater than the length of a work bar to be reduced, a gripper for clamping the trailing end of a work bar and mounted on said slide for movement relative thereto parallel to said ways, metal working rolls journaled on said frame to receive and operate on the forward end portion of a bar clamped in said gripper, a

power rotated drive shaft, means driven from said shaft for reciprocating said carriage, means for converting the reciprocatory motion of said carriageinto oscillatory motion of said rolls, screw and nut elements mounted on said carriage and continuously driven from said shaft to advance said slide relative to said carriage, and cam and follower elements on said carriage driven continuously from said drive shaft and operable to advance and retract said gripper relative to said carriage during the retraction and advance thereof and at the end of the carriage advance to feed said gripper forwardly relative to the carriage, the rate of advance of said gripper being equal to the rate of advance of said slide by said screw.

8. In a bar reducing machine, the combination of, a stationary frame, a carriage guided for reciprocation on said frame, means on said carriage for fastening one end portion of a work bar thereto for movement back and forth with the carriage, forging rolls journaled on said stationary frame to receive and work the other end portion of the supported bar, a power driven shaft, means driven by said shaft to reciprocate said carriage back and forth and also oscillate said rolls in opposite directions back and forth during reciprocation of the carriage, mechanism mounted on said carriage for movement therewith for feeding the work bar forwardly relative to the carriage near the end of each forward stroke of the latter, said mechanism including a slide mounted on said carriage and advanced continuously relative to the carriage during operation of the rolls on successive longitudinal sections gt the work bar, said mechanism also including a member mounted on said slide and rotatable continuously during advance of the slide, and a rotary drive connection extending to said rotary member and having rotary parts disengageable from each other to permit return of said slide without rotation of said member, said parts being interengageable with each other in one angular position only.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 822,878 Briede June 5, 1906 2,301,094 Tiedmann Nov. 3, 1942 2,560,934 Coe July 1'7, 1951 FOREIGN PATENTS Number Country Date 7,185 Great Britain Mar. 24, 1906 149,862 Austria June 10, 1937 521,611 Germany Mar. 27, 1931