US2298979A

US2298979A - Automatic drilling machine

Info

Publication number: US2298979A
Application number: US324028A
Authority: US
Inventors: Simons Aaron
Original assignee: Individual
Current assignee: Individual
Priority date: 1940-03-15
Filing date: 1940-03-15
Publication date: 1942-10-13
Anticipated expiration: 1959-10-13

Description

Oct. 13, 1942. A, snvloNs y AUTOMATIC DRILLING MACHINE Filed March 15, 1940 4 Sheets-Sheet 1 f, ma

Oct. 13, 1942. A. slMONS AUTOMATIC DRILLNG MACHINE Filed Maren 15, 1940 4 sheets-sheet 2 w @N @w INVENTOR A/wo/v S/MoA/s ATToRNEYmV Oct. 13, 1942. A. SIMONS AUTOMATIC lDRLLIKI MACHINE Filed March 15. 1940 4 Sheets-Sheet 5 ATTORNEY I Oct. 13, 1942'. A. slMoNs .2,298,979

AUTOMATIC DRILLING MACHIN Filed March 15,. 1940 4 Sheets-Sheet 4 llllllllllllllllll mvENToR ,4a/Pan( 6mm/v6' Patented Oct. 13, 1942 UNITED STATESPATENT OFFICE AUTOMATIC DRILLING MACHINE Aaron Simons, Bronx. N. Y.

Application March 15, 1940, Serial No. 324,028

19 Claims.

This invention relates to drilling machines or what are better termed automatic drilling machines, and particularly to machines of this kind adaptable for use in the drilling of diamonds, tungsten carbide or other hard materials for use as wire drawing dies; and the object of the invention is to provide a machine of the character described employing a plurality of drill supporting spindles with means for movably supporting workpieces beneath the spindles to intermittently move the workpieces toward and from drills supported in the spindles while rotating the drills at high speed and maintaining the drills in a fixed position; a further object being to provide means for intermittently rotating the supports for the spindles and the workpiecesin bringing successive drilling units into `a grinding and lubricating position with means for grinding the drills in this position and for dropping a combination lubricant and abrasive into the workpieces automatically; a further object being to provide means for automatically lowering the workpieces and their supports when in the grinding position to give free access of the grinding wheel to the drill to be ground; la further object being to provide means for reciprocating the grinding wheel vertically with respect to the drill in grinding the pointed end thereof, and further to the adjustment of the support for the grinding wheel to control angularity of the grinding upon the drill, thereby adapting the machine for the grinding of all drills utilized in av complete cycle of operation of drilling diamonds or other workpieces; a further object being to lprovide means for re-surfacing the grinding wheel intermediate predetermined.

grinding operations; and with these and other objects in view, as will more fully hereinafter appear, the invention consists in a machine of the class and for the purpose specified, which is simple in construction, eilicient in use, and which is constructed as hereinafter described and claimed.

The invention is fully disclosed in the following specification, of which the accompanying drawings form a part, in which the separate parts of my improvement are designated by suitable reference characters in each of the views, and in which:

Fig. l is a side and sectional view of a machine made according to my invention.

Fig. 2 'is an enlarged sectional view substantially on the line 2-2 of Fig. 1.

Fig. 3 is a sectional plan view substantially on the line 3-3 of Fig. 1 with parts of the structure broken away.

Fig. 4 is a sectional detail view substantially on the line 4-4 of Fig. 1.

Fig. 5 is a sectional view substantially on the broken line 5-5 of Fig. 4.

Fig. 6 is a face view of a part of the construction as seen in Fig. 4 looking in the direction of the arrow 6 6.

Fig. 6A is a detail view looking in the direction of the arrow 6A of Fig. 6.

Fig. 7 is a view looking in the direction of the arrow 1-1 of Fig. 3, with parts of the construction broken away and in section.

Fig. 8 is a view similar to Fig. 7 showing the parts in a different position.

Fig. 9 is a'face view of the lower end portion of one of the workpiece supporting members which I employ.

Fig. 10 is a sectional detail view'substantially on the line Ill-l0 of Fig. 1 on an enlarged scale.

Fig. 11 is a perspective view of a wobble cam detached.

Fig. 12 is a. sectional detail view through a workpiece indicating diagrammatcally the ma'nner of drilling a diamond forming part of the workpiece.

Fig. 13 shows detached views of modified points of drilling needles which I employ.

Fig. 14 is an enlarged detail view of a part oi the construction shown in Fig. lof the drawings;

80 and Fig. 15 isan enlarged detail view of a part of the construction shown in Fig. 1.

For the purpose of describing one use or adaptation of my invention, I will refer to its use in the drilling of diamonds to produce what are commonly known as drawing dies. It will be understood, however, that the machine may be utilized in performing drilling operation in workpieces of various kinds and classes and especially where it is desirable to successively drill a. workpiece with drilling tools having diierent angles whereby in a successive series of drilling operationsla predetermined tapered hole or socket may be formed in a workpiece, and one having a relatively ne pointed end so as to adapt lthe resulting workypieces for drawing strands of minute, as well as large, diameters.

In forming drawing dies or tools of the type and kind under consideration, the entrance angle or taper of the die must be constructed to suit the different uses to which the tool is adapted. With a machine of the type and kind under consideration, these tapers or entrance angles may be produced to the most accurate degree desirable,

especially through a wide range adjustability, or

whatmay be termed flexibility, of the machine.

One of the distinctive features of the present invention resides in supporting the drills in a stationary or fixed position while rotating the drills at high speed in this position. A further feature resides in yieldably moving the workpieces toward and from the drills as well as in raising Adjustably supported on the column is a bracket l I 8 to one side of which is bolted an electric drive motor I8 with the' shaft of the motor arranged vertically. The motor has an adjustable support 2l! in another bracket 2i supported on the column I8. The bracket I8 has an extension 22 upon which is supported the bed or table 28 of the machine.

The shaft of the motor I8 has an extension 24 upon which are arranged a vertical drive pulley unit.28 and pulley 28 and three other pulleys 21,- 28 and 28. The extension 24 may be supported in any desired mannenand in the construction shown, brackets 88 and 8| are indicated. The latter brackets are supported upon the extension I1 of the column I8. The bracket 8| is inturn supported upon-` a larger bracket 82 in the free end of which is arranged a drive shaft 88 actuated `engaging the rack. An adjustable coupling link 88 is provided for coupling the shaft 88 with the extension 88a thereof. Keyed to the extension 88a is a large drive gear 40.

On the bed or table 28 is an upstanding spindle 4I. Rotatable on this'spindle is lthe turret or workpiece supporting table 42. The table 42 88 and spaced apart by a spacing sleeve 84. In other words. the shaft 88a is free to rotate within the bushing 88 without contributing. any rotary movement to the shaft 88b.

The shaft 88h extends through the bracket extension 22, note Fig. l0. and is coupled with an enlarged threaded portion 88 which operates in a threaded bushing 88 keyed against rotation in a housing 81 by a screw 88, note Fig. l. At this time it is to be understood that in the upward movement `of the tools 41 through the rack 85, the screw 88 must be looned to permit the bushing 88 to slide vertically. The housing 81 is supported in.conneetion with the bracket extension 22 bybolts 88. An adjustment nut 88 is provided on the enlarged threaded extension 88 `to limit downward movement of the drills in the work-Jwww piece. The screw 88 forms a feed screw which feeds the table 48 downwardly in the slow interhas an upwardly directed sleeve extension 48 upon which the downwardly directed sleeve extension 44 of a tool supporting table 48 is arranged. The latter carries circumferentially-of the periphery thereof, tool supporting chucks 48 for the needles, drills or tools 41. The shafts or spindles of the chucks have gears 48 which mesh with the gear 48 to provide for a high speed drive of the tools 41. When quiet operation of the machine is desired, it is preferred that fibre gears 48 be employed, otherwise any other type of gears can be utilized. In the construction shown, twelve chucks 48 are employed, but it will be understood that any desired number of tools may be provided.

The tables 42 and' 48 are bolted together by a plurality of bolts 49, note Fig. 3 of the drawings, so that the two tables will operate as a unit'. It will be understood that in the upward movement of the tools 41 through the medium of the rack 38, the entire unit will move upwardly carrying with it the bushing and the bearings disposed in this bushing.

A coupling plate 5I is fixedly secured to a shaft 33h which extends downwardly through the spindle 4I. The plate 8| is secured to the bushing 80, whereas the lower end of the shaft 88a is riveted to seat in one of the bearings as at 52, note Fig. 14. The bearings are held in place by a plate mittent rotary movement thereof, as will be apparent. It will be understood that the table 48 slides on the bolts 48 which act as key pins in keying the tables 42-48 together. It will also be understood that there is sufficient ilexure in the belt 88 to compensate for this movement.

The turret `or table 42 is supported against movement on the spindle 4I by a plate 8I secured to the-top of the spindle and overlapping the sleeve portion 48. By resting upon a bearing or collar 82 seatingon an enlarged portion of the spindle 4 I, sufficient clearance is provided between the plates 8| and 8l to compensate for the automatic downward feed of the tools in the workpieces.

The chuck construction 48 is shown in sectional detail in Fig. 2 of the drawings, and at 48a is indicated a set screw for retaining the tools 41-in proper position of adjustment in these chucks. It will be understood, however, that any type or kind of chuck will be provided. While plain bearings are disclosed in the present chuck construction, it will be understood that any other mountings may be provided.

Supported directly beneath each of the chucks 48 in the table 48 are workpiece supporting memvbers 88 arranged in the table 42. Each of these members comprisea sleeve or bushing 84 in which is disposed a plunger sleeve 88. Coupled to the lower end of the plunger sleeve 88 is a rod 88.

Secured to the lower protruding end of the sleeve 64 are pins 81 to which are`attached springs 88 coupled with cotter-pins or the like 88a which serve to support the sleeve in raised position in the table 42. The protruding end of the sleeve 84 is provided with slots 88 to receive an extending arm 10 on the lower end of the rod 88. Adjustable in the arm 10 is a screw 1I, operating upon the lower end of a rod 12 which moves vertically in the table 42.v The rod is keyed against rotation therein by a pin 18 operating in a slot table 42. The lower end of the pin 88 engages and is actuated by a wobble cam 84 which is supported upon a variable pulley unit 85. 'I'he unit 85 is rotatable upon the fixed spindle 4I and actuated through the variable pulley 28 and belt 28a.

The wobble cam 84 is shown in detail in Fig. 11 of the drawings. This cam has two downwardly extending arms 84a supporting fulcrum screws 84h which are fixedly supported in the variable pulley 85. Other set screws 84e are disposed atright angles to the screws 84h and adjustably engage the pulley to vary the-inclination of the cam so as to govern the so-called wobble or cam-like action thereof to impart movement to the workpieces 8| as the cam is rotated through the pulley 85.

Supported on the top of the plunger 65\is a cup-shaped casing 86, note Fig. 2, which is adjustably supported on the plunger. Also supported within 'the plunger is a sleeve 81 in which is slidably mounted a rod 98 carrying at its upper end a supporting table 89 for the workpiece 8|. A light spring 90 is disposed between the table 89 and the casing 86 to permit yieldable movement of the workpiece 8| in a direction away from the tool 81 when the workpiece is moved into engagement with the tool; thereby avoidingany possible jamming or destruction to the fine points of the tool and compensating for any irregularities which may prevail, and

- definitely eliminating a positive movement of the workpiece into engagement with the tool. The pin 88 is retained against upward movement by a key pin 9| operating in an elongated aperture 92 in the sleeve 81 which also keys the support 89 against rotation. The adjustment of the casing 86 will regulate the tension of the spring 90.

The workpiece 8| in the construction shown and as illustrated in part in Fig. l2 of the drawings has a diamond 8m mounted therein. The workpiece body is provided with beveled sockets or admission ports 8|b and 8|c opening into the diamond. The diamond is drilled preferably by the use of three or more drills having different degrees of grindings on the pointed ends thereof. In Fig. 13 of the drawings, the drill 41a is ground at substantially 45, the drill 41h at substantially 30, and the drill 41e at substantially 15. It is the purpose to use these drills in a successive tension of the table 42, note Fig. 9 of the drawings. The roller 94 operates upon a cam 96 to lower the workpiece 8| as well as the bushing 84 against the action of the spring 68, an appreciable distance away from the tool 41 in the grinding stage or position which is later described. In this operation the screw 1| will move series of operations on one machine, or where several machines are employed, one drilling may be performed on one machine, the other on the next, and the third on the latter. If more stages of drillings are desired, other bevels will be provided on the tools for producing the desired results. The present illustration is solely for the purpose. of giving an idea as to the procedure to be followed, and not to be regarded as a re-y striction or limitation of the machine operation. The diamond may be partially drilled on one side as indicated at 8|d, whereas the final drillings to produce the final restricted area 8|e may be performed in the three stages as indicated and as diagrammatically shown in Fig. 12 of the drawings.

Returning for a moment to the plunger 65, it will be seen upon a consideration of Fig. 2 of the drawings that a rather heavy spring 85a is employed to seat upon the lower end of the plunger and upon an air vented bushing 84a supported within the bushing 64 so as to provide a further yieldable backing for the plunger. The spring 65a also supports the plunger 85 in its upwardly extended position, and at the same time holds the pin 83 firmly upon the surface of the wobble cam v84. In other words, the plunger is actuated by the cam through the compression of the spring 65a. The adjustment of the screw 1| will control the position of theworkpiece with respect to the said unit.

away from the rod 12, and the bushing 64 is keyed against rotation by the plate 93 operating in the slot 95. The cam 98 is xedly supported upon the stationary table or bed 23 as seen at 96a in Fig. 1 of the drawings.

It will be understood that throughout the operation of the machine, the `tables 42 and 45 are intermittently rotated to bring successive units consisting of one workpiece and one drill, into what may be termed the grinding and lubricating stage which is represented at :c in the upper corner portion of Fig. 3 of the drawings. To provide this intermittent feed of the tables, the periphery of the table 42 is provided with a series of teeth or projections 42a, note Fig. 3 of the drawings, adapted to be engaged by a pawl 91 pivoted to a ring 98. The ring 98 is supported upon the periphery of the table 42 and is intermittently rotated or oscillated circumferentially in a back and forth direction on the periphery of the table 42 by a link 99 coupled with the disc 98 as seen at |00 and with a crank disc |0|. The latter is driven through a reduction unit from -the pulley 26, the belt 26a of which passes around a pulley 26h mounted on the shaft 28e of 'I'he unit is in the form of a casing |02 supported upon the column I6 or the extension |1 thereof as will clearly appear in Fig. 3 of the drawings.

On the shaft 26e is a worm gear |03 operating a worm wheel |04 on a shaft |05. On the shaft |05 is a Worm |06 operating a gear |01 on the shaft |08 tov'which thecrank |0| is secured. It is preferred that a very high reduction be provided so as to provide a slow intermittent feed of the respective units to successively bring them into the grinding stage position as at It will be understood that as the disc 98 is rotated in one direction, the pawl 91 will. pick up one of the teeth 24a,'and in moving the disc 98 in the opposite direction, the tables 42-45 will be rotated one step. A spring 91a is employed to maintain the pawl in constant engaging position.

Supported on the undersurface of the disc 98 is a` gear rack or-segment 98a. This segment engages a gear |09 secured to a shaft ||0 supported in a suitable housing lil. The shaft H0 has another gear ||2 meshing with a long rack bar ||3 slidably engaging the casing and controlling a pick-up and feed of a lubricant and abrasive such as diamond dust as applied to each workpiece when the same is in the position Supported in conjunction with the housing is a long guide rail ||4 having intermediate its ends an upwardly and inwardly extending supporting arm H5 carrying at its upper end a pan or a receptacle |I6 for the lubricant abrasive compound. Supported upon the guide rail ||4 is a slide I |1 on which is pivotally supported as at H8 a pump cylinder H9. A pump'piston or plunger |20 is coupled with an'operating lever |2| which is pivoted to the free end of the rack |18. The lever I 2| operates in a recessed portion of the cylinder block, said recessed portion having two adjustable screws |22 and |23 to limit movement of the lever |2| in both directions.

Carried upon the outer end of the cylinder is a hook-shaped arm |24, the hook end |25 ofwhich is adapted to pass beneath the lower surface of the rail to support the pump casing Il! in a position as indicated in Fig. 8 of the drawings. The pump cylinder assumes a position at the extreme end of the guide rail ||4 substantially at the completion of the intermittent rotary movement of the tables 42 and 45. In this position, the pump cylinder is tilted in the psition shown in Fig. 7 to dispose the nozzle end |28 of a pick-up and delivery tube |21 within the receptacle H8.

As the disc 98 is rotated through the crank employed, the rack ||'3 will be nrst moved to the right asviewed in Fig. 7. actuating the pump |20 to suck up a portion of compound from the receptacle. It will be understood in this connection that the tube |21 is filled or substantially filled with a lubricant or other fluid. When the lever |2| strikes the adjustable screw |23, the pump cylinder |29 will be tilted, thus raising the nozzle end |26 out of the receptacle and placing the hook end |25 beneath the guide rail ||4. The slide ||1 is now moved to the right on the slide 4 until it reaches the position indicated in Fig. 8. In this position, the nozzle end |25 is disposed directly above and centrally ofY the workpiece 8|, and the disc 98 has completed its rotary oscillation in the non-feeding stroke.

Upon the beginning of the return or feed stroke of the disc or ring 98, the rack ||3 will rst move the lever |'2| in the direction of the screw |22, thus advancing the piston |20 in the cylinder to forcibly discharge the drop or small portion of the lubricant abrasive compound into the bore of the diamond disposed within the workpiece 8|. As the movement of the ring 53 continues, the slide Il? is moved t0 the left and returns to the position shown in Fig. '7, at the completion 'of which the pump cylinder is tilted to re-submerge the nozzle |25 in the receptacle |'|5, and the above cycle of operation is repeated.

During the time of actuating the pick-up and delivery of the lubricant and abrasive compound, .which is performed while the tables 42-45 are at rest, each tool or drill 41 when in the position x and when the workpieces 8| have been lowered through the means previously described, the ends of the drills or tools are ground automatically by a grinding wheel |28 which is mounted upon a rotatable and vertically oscillating shaft |23 supported in a suitable housing |30. The housing |30 is adjustable upon a bracket plate |3| to vary the angularity or inclination of the grinding wheel with respect to the tool. to grind the various tapers on4 the pointed ends thereof, as indicated in Fig. 13 of the drawings. This adjustment may be gaged by a scale |3|a provided on the surface of the plate |3| registering with a pointer I 32 supported upon a fixed bracket member |33 secured to the column I6. The plate 3| is pivoted on the bracket |33 as seen at |33a, and held in diierent positions of adjustment by a bolt |33b operating in an elongated slot |33c. This plate has a series of longitudinal dove-tailed grooves |34 in which headed bolts |35 are mounted, the latter being carried by the housing The shaft |29 is driven from the pulley 28 and a belt 28a passing around a pulley |29a on said relatively high speed. At the same time it is desirable to move the shaft longitudinally in its support. 'I'his is accomplished by the rotation of an eccentric |38 supported in the housing |33 and actuating a crankl |31 coupled with a lever |`38 pivoted as seen at |33 to the housing and coupled With the shaft |29 as seen at |43. The eccentric is actuated from the pulley 21, the belt 21a and a pulley |4|, the latter mounted on a shaft |42 supported in the housing |30.` On the shaft |42 is a worm |43 which meshes with a worm wheel |44 on the shaft of the eccentric |38. The reciprocating movement of the grinding wheel |23 over the-tool is relativelyvslow as `compared with the rotary movement imparted to said wheel.

The grinding wheel |28 is supported in a housing |45 having a suction extension as at |43 whereby a suction pipe may be employed to draw the grinding away from the machine as will be apparent.

At |54 is a larger gear in operative engagement with the gear |52 through an intermediate gear |55, so that the gear |54 is rotated at twice the speed of the gear |'52 to feed the screw y|53 a distance twice that of the feed of the tool lll, so as to bring the housing |45 in proper position, compensating for the re-surfacing of the wheel |28. In this operation, the bolt |48 is loosened iiczsprovide the said movement of the housing It will of course be understood that the resurfacing of the grinding wheel |28 is performed only when occasions require the same. Therefore, this operation is not automatic but is rather under manual control.

In the above described operation with respect shaftso as to rotate the grinding wheel |28 at 75 that all of the units are actuated simultaneously exceptfrom the standpoint of the feed of the workpieces toward and from the drillwhich is controlled through the operation of the wobble cam which operates at relatively high speed. These units move around and successively come into thel grinding stage or position as at a', and when in this position, the workpiece including its support is moved downwardly through the action of the cam and supported in this position while the grinding wheel is operating upon the tool then supported in this position. It will be understood that the tool is revolved at the same speed as the grinding wheel is rotated over the surface of the tool to re-grind or sharpen the same preparatory to another cycle of operation, or in other words, until this tool again returns to the grinding stage as at :v

The dropping of the lubricant and abrasive into the workpiece at this particular stage provides the necessary supply of lubricant and abrasive to last until the workpiece again returnsI to the stage or position as at m.

After a series of these operations have been the drilling of diamonds in producing what are known as drawing dies, that the machine is adaptable for use in drilling any type and kind of workpieces where it is desirable to maintain the drill in ilxed position while rotating at a high speed and in yieldably moving the workpiece to be drilled toward and from the drill. It will of course be apparent that the particular number of drill units employed on a machine may be varied and the degree of automatic feed of the workpiece in the direction of the drills may also be varied in machines o! dlierent types land kinds, the illustration in the accompanying drawings being understood to represent one adaptation of the invention.

In the operation of my improved machine it will be understood that one of the distinctive characteristics of the machine resides in the fact that the tools 41 are mechanically and automatically moved in the direction of the die or workpiece during each cycle of revolution of the table 4l through the medium of the feed screw 55. By virtue of this construction, and further by reason of the fact that the spacing of the workpiece or die 5l with respect to the tool 41 is adjustable, it is possible to so regulate the machine that the ilrst relative movement of the tool with respect to the workpiece may be so minute as to barely touch the workpiece or in fact may not engage the workpiece, but in each successive position oi' i the tool and workpiece, as the table is rotated, the tool is brought in closer relationship to the workpiece in minute degrees. This construction and method of procedure eliminates the collapsing of the pointed ends of the tool and eliminates the formation oi heads on these ends which commonly-occurs in other apparatus of this type and kind by reason of an excessive blow between the tool and the workpiece, the result of which is to llatten or head the pointed end of the tool, or in some cases to break 0E or' destroy this. pointed end. In the automatic operation oi the machine, it will also be apparent that after having completed one cycle oi operation, each tool is then reground to sharpen the pointed end before starting the next cycle oi operation. 'I'his regrinding is consistent with and compensates for the downward feed of the table and maintains a constant relationship of the tool with the workpiece as formed at any particular stage in the cycle, thus bringing the tools deeper and deeper into the workpiece or die until the desired drilling operation has been performed. As previously set forth, this may be through a series of stages in forming the different angles as diagrammatically illustrated in Fig. 12, it being understood that the comparative relative degrees may be varied to suit diierent types and kinds of workpieces. It-will also be apparent that the independent adjustability of each workpiece support and operating member provides for the independent control and regulation of each workpiece and the tool operating in conjunction therewith.

Having fully described my invention, what I claim as new and desire to secure by Letters Patent, is:

l. A machine of the class described comprising a pair of intermittently rotatable members coupled together for simultaneous' movement, one

member supporting a` plurality of drill chucks with means adjustably supporting drills therein, the other member having a plurality of yyieldable workpiece supporting elements disposed vin vertical alinement with said chucks, means aue tomatically rotating the drills at high speed, means tor intermittently moving workpieces supported on said elements toward and from said drills in the operation of drilling the workpieces, means intermittently rotating 'said members step by step to bring. in one complete cycle of operation, all of the drills and workpieces into one predetermined position, means at said predetermined position for moving each workpiece away from the companion drill. and means at said predetermined position for automatically grinding the end of a drill supported at said position to sharpen the same.

2. A machine of the class described comprising a pair oi intermittently rotatable members coupled together for simultaneous movement, one member supporting a plurality of drill chucks with means adjustably supporting drills therein, the other member having a plurality of yieldable workpiece supporting elements disposed in vertical-alinement with said chucks, means automatically rotating the drills at high speed, means for intermittently moving workpieces supported on said elements toward and from said drills in the operation of drilling the workpieces, means intermittently rotating said members step by step to bring, in one complete cycle of operation, all of the drills and workpieces into one predetermined position, means at said predetermined` position for moving each workpiece away from the companion drill, means at said predetermined position for automatically grinding the end of a. drill supported at said position to sharpen the same, and means automatically delivering a lubricant abrasive compound to the workpiece while in said predetermined position. i

3. A machine oi the class described comprising a pair of intermittently rotatable members coupled together for simultaneous movement, one member supporting a plurality of drill chucks with means adjustably supporting drills therein, the other member having a plurality of yieldable workpiece supporting elements disposed in vertical alinement with said chucks, means automatically rotating the drills at high speed, means for intermittently moving workpieces supported on said elements toward and from said drills in the operation of ldrilling the workpieces, means intermittently rotating said members step by step to bring, in one complete cycle of operation, all of the drills and workpieces into one predetermined position, means at said predetermined position for moving each workpiece away from the companion drill, means at said predetermined position for automatically grinding the end of a drill supported at said position to sharpen the same, means automatically delivering a lubricant abrasive compound to the workpiece while in said predetermined position, and means automaticallyv feeding one of said members in the direction of the other member during successive cycles of rotation of .both of said members to feed the drills a greater depth into the workpieces.

4. `A machine oi' the class described comprising a pair of intermittently rotatable members by step to bring, in one complete cycle of operation, all of the drills and workpieces into one predetermined position, means at said predetermined position for moving each `workpiece away from the companion drill, means at said predetermined position for automatically grinding the end of a drill supported at said position to sharpen the same, means automatically delivering a lubricant abrasive compound to the workpiece while in said predetermined position, means automatically feeding one of said members in the direction of the other member during successive cycles of rotation of both of said membersto feed the drills a greater depth into the workpieces, and adjustable means limiting the inward feed of the drills.

5. A machine of the class described comprising a pair of intermittently rotatable members coupled together ior simultaneous movement, one member supporting a plurality of drill chucks with means adjustably supporting drills therein, the other member having a plurality of yieldable workpiece supporting elements disposed in vertical alinement with said chucks, means automatically rotating the drills at high speed, means for intermittently moving workpieces supported on said elements toward and from said drills in the operation of drilling the workpieces, means intermittently rotating said members step by step to bring, in one complete cycle of operation, all of the drills and workpieces into one predetermined position, means at said predetermined position for moving each workpiece away from the companion drill, means at said predetermined position for automatically grinding the end of a drill supported at said position to sharpen the same, means automatically delivering a lubricant abrasive compound to the workpiece While in said predetermined position, means automatically feeding one ofsaid members in the direction of theother member during successive cycles of rotation of both of4 said members to 'from the companion drill, means at said predetermined position for automatically grinding the end of a drill supported at said position to sharpen the same, and means adjustably supporting the last named means to vary the angularity of the grinding of said drills.

7. A machine of the class described comprising a pair oi intermittently rotatable members coupled together for simultaneous movement, one member supporting a plurality of drill chucks with means adjustably supporting drills therein, the other member having a plurality of yieldable workpiece supporting elements disposed in vertical alinement with said chucks, means automatically rotating the drills at high speed, means for intermittently moving workpieces supported on said elements toward and from said drills in the operation of drilling the workpieces, means intermittently rotating said members step by step to bring, in one complete cycle of operation, all of the drills and workpieces into one predetermined position, means at said predetermined position for moving each workpiece away from the companion drill, means at said predetermined position for automatically grinding the end of a drill supported at said position to sharpen the same, said last named means comprising a grinding wheel, and means for intermittently resurfacing said grinding wheel 8. A machine of the class described comprising a pair of intermittently rotatable members coupled together for simultaneous movement, one member supporting a plurality of drill chucks with means adjustably supporting drills therein, the other member having a plurality `of yieldable workpieces supporting elements disposed in vertical alinement with said chucks, means automatically rotating the drills at high speed, means for intermittently moving workpieces supported on said elements toward and from said drills in the operation of drilling the workpieces, means intermittently rotating said members step Iby step to bring, in one complete cycle of operation, all of the drillsand workpieces into one predetermined position, means at said predeter- V mined position for moving each workpiece away ing the angular position of the vsurface of the feed the drills a greater depth into the workpieces, adjustable means limiting the inward feed of the drills, and means for manually raising the drill chucks for the replacement or re-setting of drills therein.

6. A machine of the class described comprising a pair of intermittently rotatable members coupled together for simultaneous movement, one member supporting a plurality of drill chucks with means adjustably supporting drills therein, the other member having a plurality of yieldable workpiece supporting elements disposed in Vertical alinement with said chucks, means automatically rotating the drills at high speed, means for intermittently moving workpieces supported on said elements toward and from said drills in the operation of drilling the workpieces, means intermittently rotating said members step by step to bring, in one complete cycle of operation, all of the drills and workpieces into one` predetermined position, means at said predetermined position for moving each workpiece away grinding wheel with respect to` the tool to be ground.

9. In a drilling machine of the class described, a workpiece drilling mechanism comprising a drill supporting chuck, means for rotating said chuck, a workpiece supporting unit `disposed in alinement with said chuck, said unit comprising a bushing, a tubular plunger slidably mounted in the bushing, a workpiece supporting part yieldably supported in said plunger, means limiting movement of said part in the direction of the drill chuck, and means moving said part intermittently toward and from the drill chuck.

10. In a drilling machine of the class described,

a workpiece drilling mechanism comprising a y workpiece arranged ranged in axial alinement drill chuck, means moving said part intermittently toward and from the drill chuck, and means yieldably supporting the plunger in said bushing.

11. In a. drilling machine of the class described, a workpiece drilling mechanism comprising a drill supporting chuck, means for rotating said chuck, a workpiece supporting unit disposed in alinement with said chuck, said unit comprising a bushing, a tubular plunger slidably mounted in the bushing, a workpiece supporting part yieldably supported in-said plunger, means Hunting movement of said kpart in the direction of the drill chuck, means moving said part intermittently toward and from the drill chuck, means yieldably supporting the plunger in said bushing, and means for moving the unit away from said chuck to space the workpiece from a drill supported in said chuck.

12. In a drilling machine of the class described, a workpiece drilling drill supporting chuck, means for rotating said chuck, a workpiece supporting unit disposed in alinementwith said chuck, said unit comprising a bushing, a tubular plunger slidably mounted in the bushing, a workpiece supporting part yieldably supported in said plunger, means limiting movement of said part in the direction of the drill chuck, means moving said part intermittently toward and from the drill chuck, means yieldably supporting the plunger in saidbushing, and means automatically feeding the chuck in the direction of said unit throughout a series of drilling operations.

13. The combination with a drilling machine having a drill supporting chuck with means for rotating the chuck and 'a drill supported therein at high speed, of a workpiece supporting unit comprising a yieldably supported plunger arranged in axial alinement with said drill chuck, means for intermittently moving the plunger toward and from the drill chuck, a workpiece supporting part having a yieldable mounting in said plunger to provide yieldable engagement of a on said part with a drill disposed in said chuck independent of the yielding support for said plunger, and means adjustable on the plunger for varying the yielding support for said part.

14. The combination with a drilling machine having a drill supporting chuck with means for rotating the chuck and a drill supported therein at high speed, of a workpiece supporting unit comprising a yieldably supported plunger arwith said drill chuck, means for intermittently moving the plunger toward and from the drill chuck, a workpiece supporting part having a yieldable mounting in said plunger to provide yieldable engagement of a workpiece arranged on said part with a drill disposed in said chuck independent of the yielding support for said plunger, means adiustable on the plunger for varying the yielding support for said part, and means for moving said plunger and part in wide spaced relationship away from a drill supported in said chuck.

15. A drilling machine of the class described comprising a vertical column, a fixed bed plate disposed at one side of the column, means supporting a motor at the opposite side of the column with the shaft of the motor arranged parallel to the column, a spindle on said bed plate, two coupled discs rotatably mounted on the spindle, means intermittently rotating the discs step mechanism comprising a' by step to bring vertically alined drilling successively into predetermined position, each unit comprising a drill rotated at high speed and a yieldable workpiece support yintermittently moved toward and from the drill in the rotation thereof, means simultaneously rotating the drills of al1 of said units, means for actuating the workpiece supports, and means for automatically 'feeding the drills in the direction of the Workpiece supports throughout a series of intermittent rotary movements of said discs. i

16. A drilling machine of the class describedv comprising a vertical column, a xed bed plate disposed at one side of the column, means supporting a motor at the opposite side of the column ,with the. shaft of the motor arranged parallel to the column, a spindle on said bed plate, two coupled discs rotatably mounted on the spindle, means intermittently rotating the discs step by step to bring vertically alined drilling units succcessively into predetermined position, each unit comprising a drill rotated at high speed and a yieldable workpiece support intermittently moved toward and from the drill in the rotation thereof, means simultaneously rotating the drills of all of said units, means for actuating the workpiece supports, means for automatically feeding the drills in the direction of the workpiece supports throughout a series of intermittent rotary movements of said discs, means automatically lowering the workpiece supports when in said predetermined position to give free access to the drill of said unit, a grinding wheel arranged in said predetermined position for engaging the drill, and means for rotating said wheel and for moving the same longitudinally of the pointed end of the drill in the operation of grinding the same.

17. A drilling machine' of the class described comprising a verticall column, a nxed bed plate disposed at one side of the column, means supporting a motor at the opposite side of the col-- umn with the shaft of the motor arranged parallel to the column. a spindle on said bed plate, two coupled discs rotatably mounted on the spindle, means intermittently rotating the discs step by step to bring vertically alined drilling, units successively into predetermined position, each unit comprising a drill rotated at high speed and a yieldable workpiece support intermittently moved toward and from the drill in the rotation thereof, means simultaneously rotating the drills of all of said units, means for actuating the workpiece support, means for automatically feeding the drills in the direction of the workpiece supports throughout a series 'of intermittent rotary movements of said discs, means automatically lowering the workpiece supports when in said predetermined position to 'give free access to the drill of said unit, a grinding wheel arranged in said predetermined position for engaging the drill, means for rotating said wheel and for moving the same longitudinally of the pointed end of the drill in the operation of grinding the same, and means adjusting the angular position of said grinding wheel to regulate the angularity or taper of the pointed end of said drill.

18. A drilling machine of the class described comprising a vertical column, a xed bed plate disposed at one side of the column, means supporting a motor at the opposite side of the column With the shaft of the motor arranged parallel to the column, a spindle on said bed plate,l

two coupled discs rotatably mounted on the spindle, means intermittently rotating the discs step by step to bring vertically alined drilling units successively into predetermined position, each unit comprising a drill rotated at high speed and a yieldable workpiece support intermittently moved toward and from the drill in the rotation thereof, means simultaneously rotating the drills of all ofsaid units, means for actuating the workpiece supports, means for automatically feeding thedrills in the direction of the workpiece supports throughout a series of intermittent rotary movements of said discs, means automatically 10 lowering the workpiece supports when in said predetermined position to vgive free access to the drill of said unit, a grinding wheel arranged in said predetermined position for engaging the drill, means for rotating said wheel and for moving the same longitudinally of the pointed end of the drill in the operation of grinding the same, means adjusting the angular position of said grinding wheel to regulate theA angularity or taper of the pointed end of said drill, means involving spaced drives longitudinally of the motor shaft for rotat ing the drills, operating the workpiece support.

intermittently rotating said discs, rotating the' grinding wheel and for moving said wheel longirotating said drill chucks and workpiece supporting members in a successive series of intermittent movements in each complete cycle of rotation of said chucks and members with respect to a predetermined position, means for slowly feeding the drill chucks in the direction of said members in the intermittent rotary movement imparted thereto to slowly feed the drills into workpieces supported in said members, and means for rotating drills supported in said chucks at high speed.

AARON SIMONS.