US2072563A - Automatic multiple broaching machine - Google Patents

Description

March 2 1937. J. E. LYNCH ET AL 2,072,563

' AUTOMATIC MULTIPLE BROACHING MACHINE Filed Nov. 15, 1935 6 sheets-sheet 1 ATTORNEY.

" March 2, 1937.

J. E. LYNCH ET AL AUTOMATIC MULTIPLE BROACI'IING MACHINE Filed Nov. 15, 1955 6 Sheets-Sheet 2 ATTORNEY.

AUTOMATIC MULTIPLE BROAGHING MACHINE Filed Nov. 15, 1935 6 Sheets-Sheet 3 ATTORNEY.

2, 1937, I J E LYNCH ET AL 2 12,563 AUTOMATIC MULTIPLE BROACHING MACHINE Filed Nov. 15 1935 e Sheets-Sheet 4 3 mmn q ul ulh. HUM" .40 f4 1 2' 22 O I N VB NTOR. fa/19V f [Y/YCH March 2, 1937. .1. E. LYNCH ET AL 2,072,563

AUTOMATIC MULTIPLE BROACHING MAUHINE Filed Nov. 15, 1935 6 Sheets-Sheet 5 ATTORNEY.

1 March 2, 1937. J. E. LYNCH ET AL 2,072,563

AUTOMATIC MULTIPLE BROACHING MACHINE Filed Nov. 15, 1955 6 Sheets-Sheet'G ATTORNEY.

Patented Mar; 2, 1937 UNITED STATES.

PATENT OFFICE AUTOMATIC MULTIPLE BROACHING MACHINE John E. Lynch, Howard L. Pope, and Amos H. Hawley, Cincinnati, Ohio, assignors to The Cincinnati Milling Machine 00., Cincinnati, 'Ohio, a corporation of Ohio Application November 15, 1935, Serial No. 49,986

17 Claims.

This invention relates to broaching machines and more particularly to an automatic multiple broaching machine. Y

/ One of the objects of this invention is to provide any modifications may be made in the exact struc-' tural details there shown and described, within the scope of the appended claims, without departing from or exceeding the spirit of the invention.

Referring to the drawings in which like reference numerals indicate like or similar parts:

Figure 1 is a front elevation of a machine tool embodying the principles of this invention.

Figure 2 is a detail viewof the right side of the 25 machine showing a trip operable mechanism for the work loader.

Figure 3 is a section on the line 33 of Figure 1.

Figure 4 is a horizontal section on' the line 4-4 of Figure 1.

Figure 5 is a vertical section on the line 5-5 of Figure 1.

Figure 6 is a section on the line 6-6 of Figure 4.-

Figure 7 is a vertical section on the line 'l'| of Figure 1.

Figure 8 is a horizontal section on the line 89 of Figure 1 showing the mechanism for shifting theiwork holding slide.

Figure 9 is a horizontal section on the line 9-9 of Figure 1 showing the details of the work slide locking mechanism.

Figure '10 is a diagrammatic view of the hydraulic circuit of the machine.

Figure 11 is a detail view of the tripping mechanism. a

In the drawings a vertical type broaching machine has been selected to illustrate the principles of this invention. This machine, as shown in.

Figure 1, comprises a bed or main support In upon which is formed a pair of vertical guide ways ll 50 and I2, and respectively receiving the vertically movable rams l3 and i4. Means are provided for reciprocating the rams in opposite phase relation whereby when one ram is moving up on its return stroke the other ram 55 is moving down on its cutting stroke. This makes a 26 which are integral with t e slide I1.

it possible to provide a first means for holding the work that is being. broached and a second means into which the work maybe loaded preparatory to the downward stroke of the other-ram.

This machine is designed to broach simultaneously a plurality of work pieces during which time a similar number of work pieces are being simultaneously loaded in a second work holding means. g

The work pieces illustrated at I5 in Figures '3, 4 and 5 may be small cylindrical shaped parts, in

the end of which is to be broached a cross slot l6 which may be diametrically located on the end of the piece.

The machine is illustrated as having a capacity for broaching four of these work pieces simultaneously, but.it will be apparent from the de- L scription herein that the number may be increased or decreased, without changing in any way the principles of this invention.

As illustrated in Figure 6, a cross slide I1 is provided in which are formed eight work receiving passages l8, and dualclamps l9, 20,.2l and 22 are provided whereby two work pieces may be secured by depressing each clamp.

The particular construction of one of these clamps is shown in Figure 6 from which it will be seen that the clamping member 22 is provided with its guiding grooves 23 and 24 on opposite vertical sides thereof into w ch fit tongues 25 and A rod2'l is secured as by a pin 28 to the member 22 and has a sliding fit in a bore 29 formed in the slide H. The rod has an enlarged head 30 which is adapted to slide in the enlarged bore 3|. A spring 32 is enclosed in the bore 3| and acts against the head 30 to exert a continuous upward thrust on the clamping member 22whereby it 'normallyis held in a. raised position so that the work receiving passages l8 are sufficiently enlarged to permit the insertion of work in a free and easy manner.

It will be noted from Figure 6 that the clamping member 2| is actually higher than clamping member 22 and that each of these clamping members' has a beveled surface 33 and 34 respectively 7 formed on the top thereof.

end of each plunger is threaded at 4|, which threaded portion passes through a reduced bore ing member 22 will pass beneath the plunger 35 without interference therewith with the result that the clamping member 22 will engage the roller 44 in the end of plunger 36 at substantially the same time that the beveled face 33 on member 2| engages the roller 44 on plunger 35. By means of this construction, members 2| and 22 will be depressed substantially at the same timeso that four work pieces will be automatically clamped in working position at the same time.

When the member I1 is shifted toward the right the clamping members 19 and 28 will pass from beneath the respective clamping plungers 45 and 46, thereby automatically releasing the four work pieces held thereby.

From the foregoing it will be seen that merely shifting the slide 11 from one extreme position to the other willautomatically efiect clamping of one plurality of work pieces and a simultaneous unclamping of another plurality of finished work pieces.

The work supporting slide l1, as shown in Figure 3, rests upon a bearing surface 41 formed on the support 48 and is held against lateral movement by a gib 49. The member I 1 also has an integral depending portion 50 which engages a guide surface 5| which holds the parts against any elevating movement.

The slide I1 is reciprocated by a lever 52, which as shown in Figures 3 and 8 is pivotally mounted at oneend on the fixed pin 53 which serves as a fulcrum, and at the other end connected to the slide l1 through the following means. cated member 54 is secured to the slide I1 and has a squared block 55 pivotally mounted on the pin 56 and this block is engaged by the bifurcated end 51 of the lever 52. The construction is such that relative movement in a radial direction may take place between the lever 52 and the block 55, still permitting the block to rotate about the axis of pin 56 during longitudinal movement of the slide I1.

The lever 52 has an axially elongated slot 58 formed therein which is of suflicient width to receive a roller 59 pivotally mounted on the end of a crank arm 68. As the crank arm is rotated in a counterclockwise direction, as viewed in Figtherewith in mesh with a rack bar 63. The rack bar 63, as shown in Figure 9, has a piston 64 secured to the end thereof and slideably mounted in a cylinder 65. Upon admission of fluid pressure to opposite ends'of the cylinder 65 the lever 52, and thereby the slide l1, may be oscillated to alternately position different groups of work pieces in operative relation to the broach rams.

A pair of locking plungers 66 and 61 are provided for locking the slide l1 in either one of its two positions. These plungers, as shown in Figure 9, have rack teeth formed thereon which intermesh with a gear 68 which issecured to the A bifurshaft 6|. It will be noted from Figure 8 that the roller 59, during the last portion of its movement, will not effect any movement of the lever 52, thereby providing sufficient lost motion whereby the slide 11 will be substantially at rest when the plungers are interengaging the respective slots 69 and 1|! in the slide. Thus, the piston 64 serves to unlock the slide, move it to a new position and relock it in a single stroke thereof.

A mechanism has been provided for automatically loading the work holders in timed relation to the movement of the breaches and comprises an indexible carrier, indicated generally in Figures 3, 5 and 7 by the reference numeral 1|, which is supported on the shaft 12. This carrier consists of'four wheels 13, each of which is keyed to the shaft 12- and each having eight work receiving bosses 14, each of which has associated therewith a plurality of pins 15 which are so located as to engage locating surfaces in the work piece whereby the work piece will be so oriented that a slot will be broached therein in predetermined relation to the remaining surfaces on the work piece. It will be understood, of course, that any other suitable means may be utilized for orienting the work pieces, which will depend upon the size and shape of the work.

The operator merely loads the work on the bosses as they reach the work loading position 14A and automatic means are provided for unloading the work into the work holders. Means are provided for successively indexing the work carrier once for each stroke of the ram.

This means comprises a pawl 16 which is pivotally mounted on a pin 11 carried bya reciprocable member 18. A spring pressed plunger 19 continuously urges the pawl in a counterclockwise direction to maintain engagement of the free end of the pawl with cross pins 86, projecting from the side .of. one of the wheels 13. When the slide 18 is moved to its extreme position to the right of that shown in Figure 3, the pawl 16 will move to the position indicated by the dash and dot lines, the beveled end 81 of the pawl causing it to engage and pass beneath the next pin. When the slide is retracted, the wheels will be indexed to position the next set of work pieces in front of the work holders.

The slide 18 has an upwardly extending boss 82 to' which is fixedly connected a bifurcated member 83 carrying a pin 84, which passes through a link 85. The link 85 is pivoted at 86, as shown in Figure 4, and connected at the other end by a pin 81 to a plunger 88. This plunger has a cross pin 89 near the inner end thereof which engages in across slot 98 formed in a tubular member 9|. This tubular member has an inner spring 92 which engages the end of plunger 88, and an outer spring 93 which is positioned between a fixed shoulder 94 and a shoulder 95 formed on the tubular member, whereby it is continuously urged in a direction to movethe roller 96 toward the vertically moving ram. This movement is. limited, however, by slide 18 engaging an abutment 91, as

.more particularly shown in Figure 3.

The roller 96, as shown in Figure 2, is adapted to be engaged by a V-shaped dog 98 carried by the ram l4. .In other words, as the ram I4 moves downward, as on a cutting stroke, the dog 98 ,will engage the roller 96 about midway of the ram stroke and thereby through the spring 92 and lever 85 cause a reciprocation of the slide 18. The same Willbe true during an upward strokeof the ram. In other words, the carrier is indexed twice during one reciprocation of the ram 14.

The reciprocable slide 10, in addition to carrying means for indexing the carrier 1I, also carries means for moving the work from the carrier into the work holders. Each wheel consists of two side plates 99 and I00, which are sufliciently spaced to permit a finger IIII, as shown in Figure 5, to reciprocate between the plates in such a manner that when the member 10 is retracted, the end I02 will be behind the work receiving boss 14, and upon advance of the member 18, the end of the finger I02 will push the work piece I into a work receiving passage I0. The finished work piece in the passage will simultaneously be pushed on through, and'a chute I03 is so located as to re, ceive the falling finished work pieces and conduct them to the opening I04 where they will be deposited in any suitable container. As shown in Figure 4, there are four of these fingers, one for each wheel.

A detent mechanism shown in Figure '7 has been provided to insure accurate positioning of the work carrier so as to accurately align the work with the passages in the work holders. This mechanism comprises a detent wheel I05 in the periphery of which is formed a plurality of arcuate-shaped notches I06 which are adapted to be engageable by a roller I01 carried in the end of a spring pressed lever I08.

The machine may be hydraulically operated and one form of hydraulic circuit which may be utilized for this purpose is shown in Figure 10. A pump I09, having an intake I I0 through which oil is drawn from a suitably positioned reservoir III, is utilized for supplying fluid under pressure to the hydraulic circuit. The pump is connected by a delivery channel H2 to a valve I I3 which is utilized as a start and stop valve by shifting plunger H4 to different positions, this .plunger also being movable to a third position by hand for reversing the direction of operation of the rams, if such should be found necessary.

' In the running position, however, which is that shown in Figure 10, the pump delivery channel I I2 is connected through a cannelure H5 in valve plunger H4 and channel II6 to port II1 of valve H8 which functions as a form of interlock valve to insure that the work supporting slide has completed its shifting movement from one broaching station to the other before the rams start their next stroke.

Between this interlock valve and the hydraulic motors which operate the rams-is a pair of reversing valves, one for each motor, which are adapted to be simultaneously tripactuated by the respective rams. valve does not, however, cause an immediate change in the direction of ram movement, there being a slight delay to permit shifting of the work support. The interlock valve serves as a means to provide this delay because the valve is coupled to the work support and is not shifted until the work support has almost reached the end of its stroke.

In the hydraulic diagram the reversing valves have just been trip actuated to the position shown to change the direction of flow in thechannels leading to the respective motors. but the interlock valve is still awaiting completion of the shifting of the work support.

When the interlock valve plunger is finally shifted it will be moved to the left of the position shown and the port II1 will then be connected through cannelure H9 in valve plunger I20 to channel I2I, which leads to port I22 of valve I23 which serves to reverse the direction of fluid fiow Shifting of the reverser through channels I24 and I25 connected to cylinder I26 which has 2. contained piston I21 operatively connected to the broaching ram I2. In the position shown, the port I22 is connected by cannelure I28 formed in valve plunger I29 to channel I25 whereby the pressure fluid will enter the upper end of cylinder I26 to cause downward movement of piston I21 and connected ram I2. The fluid in the lower end of the cylinder will escape through channel I24, cannelure I30 formed in valve plunger I29, and channel I3I to valve I32 which has a valve plunger I33 formed similar to valve plunger I29.

The valve I32 serves to control the direction of flow in channels I34 and I35 which lead to cylinder I36 having contained piston I31 which is operatively connected to the other breach ram II. In the position shown, the cannelure I38 in plunger I33 connects channel I3I to channel I35 whereby the fluid escaping from the lower end of cylinder I26 is introduced into the lower end of cylinder I36, causing upward movement of piston I31. The fluid escaping from the upper end of cylinder I36 will pass through the channel I34 to the cannelure I39 in plunger I33, which will connect it through channel I40 to port M! of valve IIB. This port is connected by cannelure I42 to channel I43 which terminates in port I44 of valve II3. When this valve .is in a running position the port I44 is connected by cannelure I45 to the return channel I46 which has a relief valve I41 therein which is set to maintain a predetermined back pressure in the system and insure that all of the channels are kept filled with oil.

The valve plunger I29 is shifted by a ballended lever I48 which fits in a notch I49 formed in the end of the plunger, the lever being supported on the end of a shaft I50.

Similarly, the plunger I33 is shifted by a ballended lever I5I which interfits in a notch I52 formed in the plunger I33 and supported on a shaft I53. The shafts I50 and I53 may be operatively connected to trip levers I54 and I55, mounted as shown in Figure 11 on the front of the machine adjacent the sides of the rams for actuation by suitably formed trip dogs I50 and I51 respectively. These dogs are so positioned that both trip levers, and thereby the connected valve plungers, will be shifted .substantially at the same time. Another dog is provided on each ram whereby at the other end of each ram stroke both trip levers will be actuated.

In the position of the valves shown in Figur the ram I4 is ready to move down and the ram I3 ready to move up. These rams will reach the positions shown at substantially the same time and will shift through the trip mechanism both plungers I29 and I33 to the positions shown in Figure 10.

Prior to this, both plungers I29 and I33 were to the right of the position shown, while the interlock valve was still in the position shown.

Under these conditions the fluid passed from pressure port H1 through. cannelure II 9 and channel I09 to port I90 of reverse valve I32. This valve connected port I90, through cannelure IN and channel I34, to upper end of cylinder I36 to cause the downward movement of the piston I31 and the connected ram I3. Fluid escaping from the lower end of cylinder I36 passed through channel I35, cannelure I36- and channel I90 to valve I23 where it was directed by cannelure I64 to channel I24 leadingto the lower end of cylinder I28. The piston I21 thus moved upward when the piston I81 moved downward.

Fluid escaping from the upper end of cylinder I28 passed through channel I25 and cannelure I28 01' valve I28 to the return line I29 which is connected by cannelure I42 of the start and stop valve I 28 to the return line I48.

Assuming the fluid to be flowing through the circuit, as last explained, it will be evident that when the reversing valves are trip actuated into the positions as shown in Figure 10 that the pressure port I98 will be disconnected from channel I84 and movement of the rams will stop.

At the time it is so disconnected the plunger I88 will be shifted in such-a manner as to cohnect port I98 to channel I98',,which at this time is connected by cannelure I54 to port I54 and channel I58 to a relief valve II. The channel I88 has a branch I59 through which fluid is delivered to cause a shifting movement of the work support to place unfinished work pieces in an operative position with respect to the ram.

I4. In the position of the parts shown, the fluid from channel 159 will pass through cannelure I58 and channel I19 to valve I58.

The valve I88 has .a plunger I69 which is connected to a ball-ended lever I18 mounted on shaft I". This shaft is operatively connected to a trip lever I12 mounted on the front "of the machine adjacent the other trip levers for actuation by a trip dog I18. It will be noted from Figure that the valve plunger I59 has a spring I14 interposed between the end of the plunger and the end of the valve housing I58,

' which tends to urge the plunger in a direction to disconnect-the cylinder 85 from the rest of the system. Due to this spring, the valve I59 is only opened for a short time and that is when 40 it is being held open by the dog I13. This dog is so positioned as to operate at the same time as the other dogs, so that the fluid which is now being delivered to channel I19, will be connected by the cannelure I18 to channel I11 and thereby to the left end of cylinder 55, causing shifting of piston 84 and of the work' slide to a new broaching position.

Fluid will exhaust from the other end of cylinder 85 through channel I15, which at thistime is connected by cannelure I to channel I55. This channel leads to port I88 of valve II8. At this moment the valve plunger I is still in the position shown in Figure 10, so that port I 88' is connected by cannelure I8I to channel I82, which, in turn, is connected by cannelure I88 in valve plunger II4 to the return channel I45 which empties into the reservoir I I I.

The plunger I28 of valve H8 is connected by a ball-ended lever I84 to shaft I85 and the valve may be so positioned that this shaft, as shown in Figure 3, extends to a position adjacent the periphery of a dog wheel I85 keyed to the endof shaft 5|. The end of shaft I85 may be provided with a trip arm I81, which is adapted to be engaged by a trip dog I88 carried or supported in the periphery of the dog wheel so that upon rotation of the shaft 5|, caused by movement of the piston 54, the shaft I85 will be oscillated as the piston 54 completes its movement, which means that the work holder has completed its movement to a new broaching po--. sition.

Since the work is now positioned for another broaching operation, the oscillation of shaft I85 will shift the valve plunger I28 to the left of the position shown, thereby connecting the pressure portv II1 to channel I2I leading to valve I 23. Since the plunger I29 of this .valve is already in position to connect port I22 to upper end of cylinder I25, ram I4 is starting its downward movement and ram I3 its upward movement.

In conclusion, the operation of the machine may be briefly described as follows:

The operator merely loads the work pieces in the carrier from which a specified group is airtomatically transferred during each stroke of the ram into a work holder which has sufficient capacity to permit the loading of one group of work pieces while a second group is having a stock removing operation performed thereon. Fr Figure 4 it will be noted that the rams I3 an I4 are spaced apart a distance substantially equal to the width of one ram, thereby the unloading and loading operations are performed intermediate the rams. Each ram has four boaching tools .I92 secured thereto, but it will be apparent that the rams could be made wider to accommodate a greater'number of broaches and that they could be spaced further apart and the work holder may be made longer if it is desired to increase the capacity of the machine without changing the principles of operation. Attention, is invited to the fact that backing-up plates I93 are adjustably positioned opposite each ram and that each of these plates has a beveled corner I94 whereby as the work holder shifts in either direction, the rear end of the work pieces will engage the beveled edge and gradually be moved axially to a predetermined position which will determine the depth of the slot to be formed in the work piece. In other words, the rear end of the work piece is utilized as a locating surface from which the depth of the slot is measured. The machine is started by the operator shifting the start and stop valve I I4 into the running position shown in Figure 10 against the compression of spring I95, and from then on the rams reciprocate in opposite phased relation,

and at the end of each stroke there is a slight The valve. H4 is shifted by a bell crank I95 which is operatively connected to a handle I91. When the valve is shifted into the position shown, a spring pressed latch I98 holds it in that position against the spring I95. To stop the machine it is merely necessary to rotate the lever I91 in a counterclockwise direction to release the latch I98 and the spring I95 will then shift the valve to a stop position which will connect the delivery channel II2 of pump I09 with .the return line I45.

There has thus been provided 'an improved automatic machine for the purpose disclosed, which has improved means for unloading and loading a plurality of work pieces without niaterially reducing the actual cutting time of the machine.

We claim: I

1. In a broaching machine having a support, a work holder reciprocably mounted on said support, means to secure a plurality of work pieces .in said work holder, a broaching ram having a plurality of broaches thereon, equal in number to the number of said work pieces, means to reaevatee ciproeate said work holder between a working position and a loading position, and work feeding means at said loading position to simultaneously insert a plurality of unfinished work pieces in said work holder and remove the finished work pieces.

2. In a broachingmachine having a plurality of breaches, the combination of a work holder for presenting a work piece to each of said broaches comprising a slide, a plurality of work clamping members carried by said slide, said members having their upper surfaces arranged ,in stepped relation, a fixed support, 'and plungers mounted in said support with their ends in stepped relation for simultaneous engagement with said stepped surfaces upon movement of the slide to a breaching position.-

3. In a breaching machine having a plurality of broaches, the combination of a work holder having means for supporting and presenting work pieces to said breaches comprising a slide movable between a loading position, and a breaching position, means for automatically clamping the work during movement of the slide to a breaching position comprising aplurality 'pf clamping members, each member having a surface thereon inclined to the direction of slide movement, said surfaces being arranged in stepped relation, a fixed support, plungers arranged in said support in a similar stepped relatien whereby each plunger will engage an inclined surface simultaneously during movement of the slide to a breaching position whereby a plurality of work pieces may be individually clamped at the same time.

4. In a breaching machine, the combination of a first plurality of breaches and a second plurality of broaches, power operable means for moving the first set of broaches through a cutting stroke and returning the second set of broaches through a non-cutting stroke simultaneously, a common slide for supporting and presenting work to each set of breaches, means to automatically load work in one portion of said. slide while work in the other portion is being broached, means to move the slide to present ,the newly leaded work to one set of breaches and withdraw the finished work from the other set of breaches, and means to simultaneously clamp one set of work pieces and unclamp the finished work pieces during movement of said slide.

5. In a breaching machine having a pair of rams simultaneously movable in opposite directions, and means to simultaneously reverse the direction of movement of each ram, the combination of a slide for alternately presenting work to said rams, means for automatically loading said slide with unfinished work pieces during reciprocation of the rams, and means for automatically shifting said, slide to positionthe unfinished work pieces in a breaching position during reversal of said rams.

6. In a breaching machine having a pair of oppositely movable rams, and breaching tools carried by said rams, the combination of a work supporting slide, movable from a breaching position with respect to one ram to a breaching position with respect to the other ram, means for automatically reciprocating said slide, including a fluid operable piston, a shaft, rack and gear connections between said piston and shaft, a lever connected to a fixed pivot at one end and at the other end to said slide, and a crank connected to said shaft for oscillating said. lever and thereby moving said slide, I

7. In a breaching machine having a pair of breach carrying rams and a slide for alternately presenting work to said breaches, the combination of means for automatically loading said slide with unfinished work pieces including an in operable by one of said rams for moving work from said carrier to said slide and including a reciprecable member, and means operable by said member during its return stroke to effect indexing of said carrier.

9. In a.broaching machine having a pair of breaching rams, breaching tools carried by said rams and a common slide for presenting work pieces to the breaches, the combination of a mechanism for automatically loading said slide including an indexible work carrier, means trip operable by one of said rams for moving work from said carrier to said slide and including a. reciprecable member, means operable by said member during its return stroke to efiect indexing of said carrier, and a spring pressed detentwork holder with unfinished work pieces while a plurality of other work pieces are beingheld by said holder in operative position to one of said breaching rams.

11. In a breaching machine having a pair of breaching rams movable in a given plane and in opposite phased relation, the combination of a work holder movable in said plane in a direction normal to the axis of movement of said rams, a work carrier rotatably mounted on an axis lying parallel to the direction of movement of said work holder, said work carrier being positioned intermediate said broaching rams whereby work may be loaded from said carrier into said work holder during each breaching stroke of the rams,

1-2. A duplex breaching machine of the character described including a pair of spaced breach actuating rams providing a pair of breaching etations, a work loading mechanism disposed intermediate said rams, a work supporting memberhaving a plurality of work supports, and means for alternately presenting an individual work support at the loading mechanism and at one of the breaching stations.

alternately presenting an individual work support, at the loading mechanism and at one of the breaching stations, each of said work supports being individual to a particular broaching station.

14. A broaching machine of the character described, including a pair of spaced broach operating rams and a loading mechanism disposed intermediate said rams, a member mounted for reciprocation intermediate the rams, spaced work supports carried by said member and individual as respects individual rams, and means for shifting said member to present one of said supports in operative relation to its individual ram and simultaneously present the other work support to the loading mechanism for supply of a work piece to said supports.

15. A broaching machine including a bed, a pair of broach receiving rams rising therefrom in spaced relation one to the other, a table member reciprocable on the bed for alternate presentation of terminal portions thereof to the respective rams, and means providing a work loading and discharging station intermediate the rams adjacent the path of movement of the table whereby when either terminal portion of the table is disposedtin cooperating relation with one of the rams, the opposite terminal portion will be operatively positioned at the load and ejecting station substantially as and for the purpose described. I

16. The combination with a broaching machine including a support, a pair oi. broaching rams reciprocably mounted thereon and a work holder slide transversely shiitable on the support having work support portions individual to the respective rams, of means for supplying work pieces to the respective individual work supports when translated to a position remote from their rams, said means including an indexible work carrier having a plurality 01' work receiving stations, means for indexing the carrier to shift an individual station from a loading position into a position aligning a work piece thereon with a work support, and means for eilecting a reciprocation of the carrier to position a supported work piece in operative relation to the translatable work support.

17. The combination with a broaching machine including a support, a pair of broaching rams reciprocably mounted thereon and a work holder slide transversely shiftable on the support having work holding positions individual to the respective rams, of means for supplying work pieces to the respective individual work holders when translated to a position remote. from their rams, said means including an indexible work carrier having a plurality of work receiving stations,

means for indexing the carrier to shift an indi-- vidual station for a loading position into a position aligning a work piece thereon with a work support and, means for eifecting a reciprocation of the carrier to position a supported work piece in operative relation to the translatable work support, and means for effecting a retraction of the carrier in advance of the translatory movement of the support.

' JOHN E. LYNCH.

HOWARD L. POPE. AMOS H. HAWLEY.

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