US1540819A

US1540819A - Machine

Info

Publication number: US1540819A
Authority: US
Publication date: 1925-06-09
Anticipated expiration: 1942-06-09

Description

June 9, 1925. 1,540,819

J. J. THACHER CENTERING MACHINE Filed May 5, 1921 6 Sheets-Sheet 1 Sn ca m a (1H0: M W

June 9, 1925.

J. J. THACHER CENTERING- MACHINE File d May 5, 1921 e Sheets-Sheet a J. J. THACHER CENTERING MACHINE June9, 1925. 1,540,819

filed May 5, 1921 6 Sheets-Sheet 5 yaawgemtoz wgqwm "Tuiififlfi 1,540,819

J. J. THACHER CENTERING MACHINE Filed May 5, 1921 6 Sheets-Sheet 4 June 9,1925." 1,540,819

J. J. THACHER CENTERING MACHINE Filed May 5, 1921 6 Sheets-Sheet 5 I III/III [l l l June 9, 1925. 1,540,819 J. J. THACHER CENTERING MACHINE Filed May 5, 1921 6 Sheets-Sher, e

INVENTOR B 17W M ATTGRNEY Patented June U NIT E D S TATE S P ATE JOHN J. 'rnnoirnn, or wnrirnnsrintn, oonnncrionr, assienoia r PRATT & WHIT- NEY COMPANY, on NEW YORK, n. Y, La conrona'r'ion osaswmnsn CENTEll-ING- IKAGHINE.

Application mes May 5,

To (all whom it may concern:

Be it known that 1, JOHN J. Timer-Inn, a citizen of the United States, residing at l i etherslield, in the county of Hartford and State or Connecticut, have invented certain new and useful Improvements in Centering lilachines, of which the following is a specification.

This invention relates to improvements in machine tool. construction and particularly to an automatic center drilling machine.

It is an object of the invention to provide preferably in combination with a magazine, an improved blank transferring, centering and holding means adapted to transfer a blank from the magazine to the working position, to center the same in position for operation thereon by the tools, and to hold the blank in position while the tools perform 1* thereon.

Another object of the invention is to provide improved means to feed the tool. spindles toward and from the work, such operation being preferably automatically performed in timed relation with the blank transferring, centering and holding mechanism.

Another object of the invention is to provide an improved spindle driving and looking means adapted to be shifted to drivethe spindle at the desired speed or to lock the same against rotation.

it further object of the invention resides in the novel mounting of the power means on the machine, such mounting being so constructed as to readily receive thereon either an electric motor or a belt pulley driving mechanism adapted to receive power from any si'iitable source.

Another object of the invention resides in a blank guiding and supporting means, such means being adapted in one position to guide the blanks into a receiving receptacle as they are reieased from the holding means and in another position to receive and support such blanks.

With the above and other objects in view, my invention consists in the features of construction and operation set forth in the following specification and illustrated in the accompanying drawings. In such drawings annexed hereto and forming a part 01 this specification, I have shown my invention as embodied in a center drilling machine but it will be understood that the 1921. serial no. 467,056.

invention can be otherwise embodied. and that the drawings are not to. be construedE as defining or limiting the scope of the invention, the claims appended to this specie fication being relied upon for that purpose...

In the drawings:

Figure 1 is a front elevation of a centerdrilling machine having the improved mechanism embodied therein.

2 is a plan view thereof.

Fig. 3 is a rear elevation 01 the m LChine.

Fig, 4 is an elevation of oneend thereof.

F 5 is an enlarged detail view showing particularly the blank transferring, center-. ing and holding means. I 70;

Fig. 6 is an enlarged View showing. par ticularly the means for adjusting the stroke of the spindles. 4

Fig. 6 is a detail view illustrating more in detail certain of the mechanism shown. in Fig. 6.

Fig. 7 is an enlarged, detail plan view. of. one of the carrier jaws;

Fig. 8 is an end view thereof Fig. 9 is a side elevation thereof.

Fig. 10 is an enlarged detail view..partially in section showingthe spindle driving and locking means.

Fig. 11 is a plan View thereof.

Fig. 12 is a detailview taken on the line 85 12-12 cl Fig.10..

Fig. 13 is a detail view showing a belt pulley attachment mounted in positionnto drive one of the spindles, such attachment being illustrated as substituted for theelect-ic motor drive shown in Fig. 10. 4 i

Fig. 14 is an end view thereof.

Fig. 15 is a view similar to Fig. li iand showing a belt pulley attachment appliedv to the other spindle; 3

Fig. 16 is an end view thereof.

Fig. 17 is a detail view showing a belt pulley attachment mounted in position to operate the several parts of the machine, such construction being illustrated as. sub stituted for the lower electric motor'shown inFig. 3. i

Fig. 18 is an enlarged fragmentary perspective view of one end of the machine.

Fig. 19 is a fragmentary plan view taken on line 19--19 of Fig; 6.

Fig. 20 is a fragmentary sectional view taken on line 20-2 O of Fig-3.

l Vork pieces or blanks which are to be: placed in a lathe for operationithereon must 1:10

first have their ends accurately drilled or countersunk at the center thereof to receive the lathe centers. This operation is ordinarily performed in a hand or semi-automatic machine. The primary object of the present invention is to provide an automatic machine for performing this function. In its broad aspect such machine comprises the ;following principal parts: a magazine for holding a quantity of blanks, transferring, centering and holding mechanism for transferring the blanks individually from the magazine to the working position and for centering and holding the same in axial alignment with the tools a pair of drill spindles at opposite sides of the transferring mechanism, means for antomatically feeding the spindles axially toward the work, and means for varying the extent of such feeding movement. It will be understood that the invention comprises other mechanism and details of construction not above enumerated. Such mechanism and the specific construction illustrated in the drawings will now be described. It should be understood however that while the machine is primarily intended for center drilling both ends of a piece of work, a single drill spindle may be provided for certain classes of work and the drilling may be performed otherwise than at the center of the work, or a chamfering or other tool may be used if desired, all of which is within the scope of the invention.

A bed 1 supported on legs 2 has mounted thereon drill supporting heads 3 and a; The heads are adjustable longitudinally on Ways 1 of the bed and are adapted to be secured in adjusted position by the usual clamping means 5 each operated by a handle 6. Drill spindles 7 and 8 are mounted in the heads and are adapted to support drills 7 and 8 therein. v Electric motors 9 and 10 may be provided for rotating the spindles. Means are provided as hereinafter described for feeding the spindles inwardly toward the work. A magazine 11 at the rear of themachine is adapted to support a quantity of blanks 1V and a reciprocating carrier 12 is adapted to transfer the blanks individually from the magazine to a position between the drill spindles. Cooperating with the carrier is a pair of work engaging members 13 by means of which the work is centered and held in a position in axial alignment with th drill spindles. The several parts of the machine just described are adapted to be synchronously operated by means of a motor 14. These everal parts of the machine and the operations thereof will now be more specifically described.

The magazine 11 comprises a pair of blank supporting uprights 15, each mounted on a support 16, preferably integral with the adjacent spindle supporting head. Each upright is preferably mounted for a slight longitudinal adjustment on its suppmit and may be secured in position by means of a clamping handle 17 engaging a clamping bolt in a T-slot 18. By this construction it will be noted that each head and magazine upright is adjustable longitmlinally along the bed as a unit. In this manner the magazine may be adjusted for blanks of varying lengths and the drill spindles are always retained in approximately the desired operative position relative to the magazine and blanks 'i'erl therefrom. the means at 18 providingfor a slight relative adjustment of such parts to allow for tools of slightly varying lengths and for other reasons when desired. It will furthermore be noted that each work engaging member 18 is also mounted on its adjacent spindle supporting head whereby longitudinal adjustment of each spindle supporting head also adjusts its magazine upright and the opposed work engaging member 3 therewith. Means hereinafter described is provided for permitting a slight longitudinal adjustment of each work engaging member on its support.

The carrier 12 comprises a pair of workengaging jaws including in part a pair of slides 19 each mounted in a guidcway in the base of its magazine upright 15. as illustrated in Figs. 3, 7, S, 9 and 18. A work supporting and clamping plate or jaw propor 20 is secured to the forward end of each slide by means of a bolt 21 and pin 2:? engagin holes in the plate. As illustrated in Fig. 9, each plate is provided with a plurality of work engaging notches Eli-l therein of diderent sizes, and also with a plurality of holes 24 whereby the plate may be secured to the slide in any of its work cngag23- ing positions. The rear of each slide is provided with a hookshaped element 25 ad justably secured in the slide. 13) by means of a screw 26. A plunger ,7 is mounted within a bore 28 of each slide and a. compres ion spring 29 surrounding the plunger within the bore normally forces the plunger outwardly. A rod 30 mounted on a pair of levers 31 secured to a shaft 3:? on a b acket 32- bolted to the machine frame by bolts 32, engages the slides between the elements 25 and plunger 27 thereof. An arm 33 secured to the shaft has a roller 23 thereon engaging in a cam path 35 ot' a, can: i143 mounted on a shaft 37. It will be seen that as the cam is rotated the carrier will be reciprooated transversely of the bed 1. A. box 32 formed on the bracket 32 provides a receptacle for receiving extra plates 20 when not in use.

The work engaging members 13 cooperate with the carrier in centering and holding the work and each member provided with lllt! ill) a ll-shaped work engaging jaw 38. These members are each adjustable transversel of the bed 1 by means of a screw 39 operated by hand wheel 39 and are each mount-- ed on a support 40 longitudinally adjustable on a guidcway ll on its adjacent spindle supporting head. A clamp 42 is adapted to secure each support in its adjusted position opposite its (so-operating work engaging plate 20. In operation a ideal; is adapted to be fed from the mag no to the plate 20 at the rear end of the stroke of the carrier. llhe blank resting on the sur face 20 of each plate is carried forward to the aws 38 which center the hlanlc as illustrated in Fig. 5. it will be noted that in the centering operation, the blank is held between the vertical surfaces 20" of the plates and the jaws the blank being raised 'om engao'ement with the supporting; surfaces 20*. the spring 29 is adapted to compress to hold the blank with a yielding pressure. The parts are held in this hlant: securing position during the time the roller 3a is in the concentric portion of the cam path 35 the tools being adapted to operate on the blank at such time.

its the carrier moves rearwardlv an eleniient 4-3 pivoted at 43 for movement to the left onlyll ig. 5) is adapted to ens e the finished blank to push the same from the plate 20 whereupon it fa ls into a receiving receptacle hereinafter di. =ioed.

As illustrated in l to l and Figs 10 and 11, the drill spindles are rotated from motors 9 and 10, both spindles with the motors for rotating; the same being alike, a detailed description of one will suiiice. [is shown in Figs. 10 and 11. each spindle is rotatably mounted in a sleeve i l longitudinally slidaloly mounted within the head and prevented from rotation therein .by means of a key 4-5. lQhe drills 7 and 8" are secured in the spindles by means of chucks 4.6 and stop members ii are provided for limiting the depth of the drilling operation.

The rear portion. of each spindle is splined within a pair of integral gears t8 and 4-9 and supported within the hearing 50. The motor armature shaft extends through a hearing and has niountcd thereon a pair o and ti l. i-in element mounted between the gears l8 and 4-9 and provided with a handle 56 serves to shift the said gears into driving; engagement with the gears 53 and 54- whereby obtain either of 49 in their driving relation with gears 53 and 54: respectivelv. liloven'ient thereof into the notch 55) is adapted to engage the lug til of the element in the aperture 62 in the gears it; and a9 whereby to lock the spindles against rotation. The purpose of such con- StljllC'tlOil is to prevent rotation of the spindle while the drill securing cap nut of the chuck l6 is being removed to change the drill. should be noted that the relation of the notches Si. 58 and 59 is such as to provide an interlock preventing the simultaneous engagement oi? the spindle locking means and the drive gearing thereof. v

llhe spindle feeding means are operated synchronously with the blank feedingand holding means, both being}; illustrated as operated from the shaft 37. Each spindle sleeve 44: is provided with rack teeth 63 therein engaged by a pinion 64-:- it pair of s 65 is n'iounted on the shaft supporting ion 64 in the head land a similar pair of arms is niiounted on a shaft supporting a pinion 66 in mesh with pinion 64 in the head An arm 6? loosely journaled on each of said shafts extends laterally between the arms 65 (Figs. 3 and 4) and each has means tli .reon adapted to engage a set screw 68 and a spri pressed plunger in the arms 65. Clamping; screws 70 in the ends of the arms 67 are adapted to secure such arms to operating); rods 71 pivoted at 71 to one arm of an operating; hell-crank lever. The other arm of this lever is provided with roller 73 slidahly mounted in a guidewav 7d- (ii in a bracket 75. The fulcrum of the lever is supported by

rollers

76 and 76 operating; in a cam path 77 in the cam 36, and in a horizontal guideway between guide shoes 76 on the base plate of the bracket (Fig. 6 It will now be seen that as the cam rotates the hell-crank lever is 0L) moved in the guideway 76" in a general direction parallel to the shaft 37 and the rods 'i'l are given a longitudinal movement there from. With the guideway 74: adjusted to the angular position illustrated in Fig. 6, the roller Z 3 rides downward in the guide wav 74; as the bell-crank lever is moved to the left. This rocks the hell-crank lever about its fulcrum 76, the extent of such rocking movement depending upon the angle to which the guidewav i4 is adjusted. The movement of the pivot 'll to the left 8 and 6) is adapted to feed the drill spindles inwardly and the rocking movement of the helhcranl: lever to the left therefore inc eases the feeding movement of the drill spindles. With the guideway 74 placed in a horizontal position; the roller 7'3 rides therein without any vertical movement and the bell-crank lever is therefore given no rocking.movement as the cam 36 is rotated. By adjusting; the bracket and guidewav about the pivot 749 to incline the nu 'dewaj in the opposite direction to that illustrated in Fig. t, the roller T3 will be moved upwardly as the tnlcrnni roller 76 moved to the left, whereby the bell-crank lever rill be rocked to the right and the pivot 71 will be moved to the right and thereby decrease rather than increase the feeding movement of the spindles relative to the movement oi roller 76. In Fig. (3 the guideway 74- is set to give the maximum stroke to the spindles. A. elarnp T8 is adapted to clamp the bracket 75 in any of its adjusted positions. It should also he noted that as the stops l? on the spind es engage the Work and prevent further inward movement of the spindles. the spring; plunger 69 yields durthe continued movement of the spindle operating means.

l he 3G is driven from motor 14; through the following mechanism (Fig. A small spiral gear 79 on the motor shaf engages a large spiral gear 80 on shalt S1. A spur gear on the shall 81 meshes with. a spur rear 8?; on a shaft and Worm on the shait 8 meshes with a worm wheel 86 on the aforesaid shaft 37. A pump 87 is adapted to be driven from the shatt 81 through a belt 88 whereby a lubricant is de livered from a tank 89 through conduits 90 to the drills. Three electric switches 91 (Fig. 1) are adapted to control the operation of the motors.

A receptacle 92 is illustrated for receiving the finished blanks as they are released from the holding: means. Above this receptacle l preferably pivot an element 93. This it. in the position illustrated in Fig. as a means to guide the finished into the receptacle 02. When it is blanlrs desired to remove the receptacle for emptyinc; the same. the element 90 is raised up to the horizontal position illustrated in dot and dash lines (Fig. wherein it is sup ported by a hook 94.. In this position the element catches and supports the blanks until the receptacle returned to place. The element may be released from the heel: by r. ,sing the handle 94.

In some instances. it may be preferred to operate the machine through belt driven means rather than through the motors here totore described. In Figs. 13 to 17 I have illustrated attachments adapted to be substituted directly for the said motors. such attachn'ients being; provided with belt pulleys adapted to be operated from any convenient source of power.

The attachment illustrated in Fig. 13 comprises a supporting" surface or face plate 95. a supporting arm 96 providing a bearing 9'? for a shaft 98. The shaft has a pulley 99 thereon operated by a belt 100. Bolts 101 extending through the face plate are adapted to secure the attachment to the machine in the same manner that motor 10 is secured by bolts 101. The shaft 98 is supported adap cd to support e :11'1..i .a ..1 of motor 10. .r guard 10?. is pre'l'erably provided on t 1c at out the use of ie attachment l 'l'lnfl' nieu'ibers are normally posi- :(l directly Opl lOFlllG each other whcrcb e olank is held dirertl between such nieuir14. Furtherinmc the members and 1%) e supported on the bases of their adjacent: .pi dle supporting; heads or l \vhcrchv. .lie mechanism to the length be operated upon. 0: ch spinits magazine member and r e. gaging member is adjusted as a unit on the Ways 1 o" the bed.

Tt is believed that incr-lmnism compris the machine and. the operation there of will be clear without further description.

Vrhat I claim is: i

1. A machine tool comprising; in combination. a base. atool spindle. a laterally n'mvable carrier on the base having: a blank supporting surface and a relatively amnrlal blank lllinll' surface. the carrier beinp; adapted to support a blank on its sun porting); surface and carry the same troui a loading position laterall ol the spindle lo a tool] position arl' iaccnt the spindle. :i normally titted iaiv between which and the said bla. growing! snr't'ace the blank s adapted to be entered and held by the car-- Q: r the tooling operal ion. the said blank supporting and gripping; silrl'accs being: adapted to perform their respective lunctions independently of each other. and means for feeding the spindle toward the blank and operating the carrier.

2. A machine tool comprising in combination, a base, a tool spindle. a laterally IllOV- llll able carrier on thelnise having a substantially horizontal blank supporting surface and a substantially vertical blankgripping sin-face, the barrier l'ieii' r adaphidto support a blank on its supportlnn surface andcarry the same from a loadin position laterally of the spindle to a tool no; positionadjacent the spindle, a norn'ially fixed jaw between which and the said blank gripping surface the blank isadapted to be centered andheld by the can 0 forthe tooling operation, and means for feeding the spindle toward the blank and operating the carrier.

3. A machine tool comprising in combination a base, a tool'spindle, a laterally movable carrier on the base having! a substantially horizontal blank supporting surface and a substantially vertical blank gripping surface, the carrier being adapted to support a blank on its supporting; surface and carry the same from a loading position laterally of the spindle to a tooling position adjacent the spindle, normally fixed V- shaped jaw between which and the said blank gripping}; surface the blank is adapted to be centered and heldby the carrier for the tooling operation, the fixed jaw and carrier being so relatively positioned that in the centering and holding operation the blank is raised from the SliiDPOlllllgl surface, and means for feeding the spindle toward the blank and operating the carrier.

ii. machine tool comprisin in combina tion, a base, a tool spindle, a laterally movable carrier on the base having; a blank sup porting surface and a relatively angular blank gripping surface, the carrier being" adapted to support a blank on its supportin? en ice and carry the same from a loading); position laterally of the spindle to a tool'nsz position adjacent the spindle, it nor mally d j aw between which and the said blank gripping surface the blank is adapted to be contented and held by the carrier for the tooling operation independently of the said blank supporting surface, means for adjusting the fixed jaw transversely of the spindle, and means for feeding the spindle toward the blank and resiliently operating the carrier.

5. A machine tool comprising in combina tion, a base, a tool spindle, magazine for supporting); a plurality of blanks, a laterally movz-ible carrier on the base having a blank supporting surface and a relatively angular blank gripping surface, the blank supportinn; surface being adapted to receive a blank from the map inc and to support and carry the same there 1'0111 to a tooling position adjacent the spindle", a normally fixed jaw between which andthe said blank gripping irface the blank is adapted to be centered and held by the carrier for the tooling operation independentlyof the said blank supporting surface, and means for auto1natically feeding the spindletoward the blank and operating the carrier.

6. A machine toolcomprising in combination, a bavse, a tool spindle, a magazine for supporting a plurality of blanks, a laterally movable carrier slidably mounted on the base and having a substantially horizontal blank supporting surface and a substantially vertical blank gripping surface, the blank supporting surface being; adapted to receive a blank from the magazine and to support and carry the same therefrom to a tooling position adjacent the spindle, a normally fixed il-shaped jaw between which and the said blank gripping surfacethe blank is adapted to be centered and held by the carrier for the tooling operation, the fixed jaw and carrierbeing so relatively positioned that in the centering and holding operation the blank is raised from the supporting surface, and means for automatically feeding the spindle toward the blank and operating the carrler.

'Z'. A. machine tool comprising in combinae tion, a, base, a tool spindle, a magazine for sijipporting a plurality of blanks, a horizontally movable carrier slidably mounted 'n the base of the magazine and having a substantially horizontal blank supporting su lace and a substantially vertical blank gripping surface, the blank supportingsurface being adapted to receive a blank from the magazine and to support and carry the same therefrom to a tooling position adjacent the spindle,a normally fixed jaw between which and the said blank gripping; sur ace the blank is adapted to be centered and held by the carrier for the tooling; operation, and ll'lallS for automatically feeding the spindle toward the blank and operating the carrier,

, 8. A machine tool comprising in combination, a base, a tool spindle, a n'iagazine for supporting a plurality of blanks,a pair of laterally movable lllell'llJClS on the base each having a horizontal blank supporting sur face and a vertical blank gripping surface, the blank supporting surfaces being adapted; to receive a blank from the magazine and to support and carry the same therefrom to a tooling position adjacent the spindle, a normally fixed aw between which and the said blank gripping surfaces the blank is adapted to be centered and held by the member for the tooling operation, means for adjusting the fixed jaw transversely of thespindle, and power operated means for synchronously feeding); the spindle toward he blank and resiliently operating the member. 7 i

9. A center drilling; machine comprising in combination, a base, a pair of oppositely disposed drill spindles on the base, a magazine for supporting a plurality of blanks, a pair of laterally movable members on the base having horizontal blank supporting surfaces and vertical blank gripping surfaces, the blank supporting surfaces being adapted to receive a blank from the magazine and to support and carry the same therefrom to a tooling position between and adjacent the spindles, a pair of fixed jaws between which and the blank gripping surfaces the blank is adapted to be centered and held by the members for the tooling operation, and means for automatically and synchronously feeding the drill spindles toward the blank and operating the members.

10. A center drilling machine con'iprising in combination, a base, a pair of oppositely disposed drill spindles on the base, amagazine for supporting a plurality of blanks, a horizontally movable carrier on the base having substantially horizontal blank supporting surfaces and substantially vertical blank gripping surfaces, the blank supporting surfaces being adapted to receive a blank from the magazine and to support and carry the same in a substantially horizontally direction therefrom to a tooling position between and adjacent the drill spindles, a pair of fixed jaws between which and the blank gripping surfaces the blank is adapted to be centered and held by the carrier for the tooling operation, means for adjusting the jaws transversely of the spindles, and means for automatically and synchronously feeding the drill spindles toward the blank and operating the carrier.

11. A center drilling machine comprising in combination, a base, a pair of oppositely disposed drill spindles on the base, a magazine comprising two relatively adjustable guideway members for receiving the ends of a plurality of blanks, a movable carrier adapted to receive a blank from the magazine and to support and automatically trans fer the blank from the magazine to a tooling position between the drill spindles, a pair of fixed jaws against which the blank is adapted to be centered and held by the carrier for the tooling operation, means for relatively adjusting the magazine guideway members longitudinally of the spindles and for likewise relatively adjusting the jaws, and means for automatically and synchronously feeding the drill spindles toward the blank and operating the carrier.

12. A center drilling machine comprising in combination, a base, a pair of oppositely disposed drill spindles thereon, means on the base for centering ablank in the drilling position between the drill spindles and for holding the blank in such position, a pair of links operatively connected respec tively to the drill spindles, a single cam for reciprocating the links to automatically and simultaneously feed the drill spindles toward the blank, means other than the cam for varying the'stroke of the spindles, and

power means for synchronously operating the first .nai'ned means and the cam.

13. A center drilling machine comprising in combination, a base, a pair of oppositely disposed drill spindles thereon. means on the base or centerin blank in the drillinsz' position between the drill spindles and for holding the blank in such position, a cam men ier provided with a cum pa a bination, a base, a tool spindle. a movable (if blank carrier on the base, :1 rectangular plate-like blank engaging jaw mounted on the ca ier and having different sized blank en ing: notches in the corners thereof, s for securing the jaw to the carrier with any one of the notches in the blank engaging position, a normally fixed jaw against which the blank is adapted to be centered and held by the frst named jaw. and means for synchronously and autoi'nath eally feeding the spindle toward the blank and operating the carrier.

15. A center drilling machine comprising: in eon'ibination, a base, pair of oppositely disposed drill spindles on the base a moyable blank carrier on the base COH'iIHlSlTi'I two spaced elements. a rectangular platelike blank eng ging; jaw mounted on each element, the jaws each being provided with difierent sized notches in the corners thereof, means for secur ng the jaws to the elements with any of t e notches in the b ank engaging position, a pair of fixed jaws against which the blank is adapted to be centered and held by the irst named jaws. n'ieans for adjustiinl the fixed jaws trans versely of the spindles, and means or auto matically and synchronously feeding the drill spindles toward the blank and operating the carrier.

16. A center drilling machine comprising in combination, a base, a pair of oppositely disposed drill spindles on the base, a movable blank earrier on the base comprising two snbstantiallv horizoi'itally movable slides, a rectangular plate-like blank engaging jaw mounted on each slide. the jaws eaeh being provided with different sized notches in the corners thereof, means including bolts for securing the jaws to the slides, the j awe each being provided with a plurality of spaced bolt-rece wing holes therein whereby the jaws may be mounted with any of the said notches in the blank engaging position. a pair of fixed jaws against which the blank ltlli lie ea ers is adapted tobe centered and held by the first named jaws, means for adjusting the Flflifl jaws trunsn ersely oi. the spindles, and means tor automatically and synchronously tending: the drill spindles toward the blank anal operating the carrier.

17. A machii' e tool comprising in combi: nation, a base, support mounted on one end thereof, a spindle in the support, means whereby the support may be adjusted on the base longitudinally of the spindle and secured in adjusted position, a magazine coin n'isinp; two guideway members adapted to receive the ends of a plurality of blanks, one otsaid rneznhers being mounted on the support and adjustable therewith toward and from the other member, and means for transferring; a blauktrom the magazine to the st Indie and for holding the same in position for a tooling; operation.

18. A machine tool comprising in com-- bination, a base, a support mounted. on one end thereof, a spindle in the support. means whereby the support may be adjusted on the base longitudinally of the spindle and secured in adjusted position, a magazine compr' 'r; two p uideway .ll'lWTllDBLS adaptedto receive the ends of a'plurality of blanks, one GTE said. members being; mounted on the support and adjustable therewith toward and from the other member, a fixed jaw on the support laterally of the. spindle, and means for transferring a blank from the magazine to the jaw and centerinp; and holding the same therein in position for a tooling operation.

19. A machine tool comprising; in combination, base, a supportmounted on one end thereof, spindle in the support, means whereby the support may be adjusted on the base loiuritudinally of the spindle and secured in adjusted position, a magazine comp isingrtwo pguideway members adapted to receive the ends ot a plurality oi blanks, one of said members being mounted on the support and adjustable therewith toward and from the other membe", a fixed jaw on the support laterally ol' the spindle, a movable carrier supported by the support opposite the fired jaw, and means for open atinp; the carrier to transfer blank from the n'iagazine to the jaw and to center and hold the same therein in position for a tooling operation.

20. A machine tool comprising in combination, a base, a support mounted on one end thereof, a. spindle in the support, means whereby the support may be adjusted on the base longitudually ot the spindle and secured in adjusted position, a magazine comprisingtwo gruideway members adapted toreceive the ends of a plurality o't blanks, one oil? said members beinp; mounted on the support and adjustable therewith toward and. from the other member, a fixed. jaw on the support laterally ol the spindle, a movable carrier on the said one member opposite the lixed jaw on the support, means proriding an adjustment on the support of the said one member longitudinally of the spindle, and means for operating the carrier to transfer a blank i roi'n the magazine to the jaw and to center and hold the same therein in position for a tooling operation.

21. A; ii'iachine tool con'iprisingg in combination, a base, a support mounted on one end thereof, a spindle in the support, means whereby the supportniay be adjusted on the base longitudinally of the spindle and secured in adjusted position, a magazine comprising; two guideway members adapted to receive the ends of a plurality of blanks. one of said members being mounted on the support and adjustable therewith toward and fromthe other member. a fixed jaw on the support laterally ot the spindle, a movable carrier slidably mounted on the base 0 the said one member opposite the fixed p on the support, and means for sliding the carrier to transfer a blank from the magazine to the jaw and to center and hold the same therein in position for a tooling operation.

2 9;. A center drilling machine comprising in combination, a base, a pair of supports mounted respectively on opposite ends of the base, a pair of oppositely disposed drill spindles rotatably mounted respectively on if i the supports, a magazine coinprisinlr two guideway inen'ibersrespectively mounted on the supports andadapted to receive the ends of a plurality of blanks, means for transferring; a blank from the magazine to the spindles and for centering andholdinethe same in the drilling position therein. means for moving: the drill spindles toward the blank, and means providing; a relativead justment of the supports longitudinally oi the spindles.

A center drilling; machine con'iprising in combination, a base, a pair of supports mounted respectively on opposite ends of the base, a pair of oppositely disposed drill spindles rotatably mounted respectively on the supports, a magazine comprising two guideway members respectively mounted on the supports and adapted to receive the ends eta plurality of blanks, a li edjaw mounted. on each support laterally of its spindle, means for transferring; a blank from the magazine to the jaws and for centering and holding the same in the drilling posi ion therein, means tor moving; the drill spindles toward the blank, and n'ieans providing; a relative adjustment of the supports longitudinally of the spindles.

24.. A center drillin machine comprising in combination, a base, a pair of supports spindles rotatably mounted respe tively on the supports, a n 'azine com sing two QllldGWFlY member-z respectively mounted on the supports and adapted to receive the ends of a plurality of blanks, a fixed aw mounted on each support la1crall. or its spii dle. a n'lovable carrier on t .e supports opposite the fixed jaws, means for operating the carrier to transfer a blank from the magazine to the jaws and to co tor and hold the same in the drilling position therein. means for moving the drill spindles toward the blank. and means providinp; a relative adjustment of the supports longitudinally of the spindles.

25. A center drilling machine comprisin in combination, a base. a pair of supports mounted respective y on opposite ends the base, a pair of L positely disposed erill spindles rotatably mounted respectively the supports, a magazine .comprisin' two guideway men'ibers rcsp "-f mounted n the supports an: a pted to receive the en of a pluralit -J of bl a tired iaw mount on each support laterally of its spinmc, a carrier slide slidably mounted on each support opposite the iii-(Oil jaws, means for operating the slides to transfer a bionic from the magazine to the iaws and centering and holding th e in the d mg positlon therein, means for moving the drill spindles toward thehlank, and means whereby the supports may as adjusted toward and from each other.

26. In a machine tool, the combination of a rotary spindle, gearing tor rotating the spindle, means for shifting the gearing to vary the speed of spindle rotation, means for locking the spindle against rotation, and a single handle for operating both means.

27. In a n'iachine tool, the con'ibination of a rotary spindle, gearing tor rotating the spindle, means for shifting the gearing to vary the speed of spindle rotation, means for locking the spindle against rotation, and means permitting the engagement of the spindlelocking means only when the gearing is out of driving engagement.

28. In a machine tool, the combination of a rotary spindle, gearing for rotating the spindle. means for shitting the gearing to vary the speed of spindle rotation, means for locking the spindle against rotation, a single handle for operating both means, and means permitting the engagement of the spindle locking means only when the gearing is out of driving engagement.

29. In a machine tool, the combination of a rotary spindle, gearing for rotating the spindle comprising a pair of connected gears splined to the spindle, means for shifting the said pair of gears to vary the speed of spindle rotation, means adapted to engage the said pair of gears to prevent rotation thereof, a single handle for operating both means, and a plate, through which the handle passes, slotted to permit the operative engagement of the spindle locking means only when the gearing is out of driving ongae ement.

30. In a machine tool the combination of a rotary sp. idle, gearing for rotating. the spindle comprising a pair of connected gears splined to the spindle, means for shifting the said pair of. gears to vary the speed of spindle rotation. means adapted to engraver: the said pair of gears to prevent rotation thereof. and a single handle for operating both means. i

3 In a machine. tool the combination of a rotary spindle. gearing for rotating the spindle con ip risinna pair of connected gears SPllUOfl to the spindle. means tor shifting the said pair of gears to vary the speed of spindle rotation, a tooth on the shitting means adapted to engage in a socket in the said pair of gears to prevent rotation thereof. and a handle tor the shitting means.

32. In a machine tool the combination of a rotary spindle, gearing: for rotating: the spindle comprising a pair of connected gears splined to the spindle, a shifting member adapted to slide in one direction to shift the said pair of gears to vary the speed of spindle rotation, a tooth on the shifting: member adapted to be engaged in a socket. in the said pair of gears by a sliding movement of the shifter member at right angles to its near shitting); UZOVQIHQDiI to prevent rotation of the gearing and spindle. and a handle tor operatine; the shifter member.

33. In a metal working machine eouipris ing a base and means tor holding :1 blank and a tool tor operating: on the blank. the combination ot means mounted on the machiue and adapted in one position to guide the finished blanks into a receiving recepta lo and in another pos. TlOTl to receive and support the blanks as they fall from the said holding means. and means for holdingthe guiding and SHPIXNtiHQ means in either of its said pos tions.

In a metal WOThTlllf m chine comprising a base and means tor holdin': a blank and a tool for operating on the blank. the combination oi": means pivoted on thouuichine and adapted in one position to guide the finished blanks into a receiving recentacle and other means for supportin'r the. first means in a position to eceive and support the blanks as they fall from the said holding: means.

In a metal workinq machine cou'iprising a base and means for holding a blank and a tool for operating on the blank. the combination ot a plate pivoted at one edge on the machine and adapted in one position to guide the finished blanks into a receiving receptacle, and. an element adapted to engage the opposite edge of the plate to suploo port the same in a position to receive and support the blanks as they fall from the said holding means.

36. In a machine tool, the combination of a support, means for holding a piece of Work and for operating thereon, gearing for operating the said. means, two optionally usable power mechanisms each adapted to be detachably secured to the support in operative connection with the gearing for driving the same, one of the said mechanisms being an electric motor and the other mechanism being a belt driven attachment comprising; a bracket having a driving pulley supported therein, both said mechanisms and the support being provided With cooperating supporting n'ieans including bolt holes adapted to be placed in alignment for mounting either mechanism on the support, and bolts for engaging in the said holes to secure either mechanism to the support with either the motor armature shaft or the said pulley in operative connection with the said gearing.

In testimony whereof, I hereto affix my signature.

JOHN J. TEACHER.