US1139794A - Machine-tool. - Google Patents

Description

F. MULLER.

MACHINE TOOL.

APPLICATION FILED MAY 21. 1904.

Patented May 18, 1915.

2 SHEETS-SHEET l- &

[KT Z 292 asses.

F. MULLER.

MACHINE TOOL.

APPLICATION man MAY 21. 1904.

Patented May 18, 1915.

2 SHEETS-SHEET 2.

g m l? mm FRIEDER-IGH MT ITLLER, 0F ELIZABETH, NEW JERSEY, ASSIG-NOB TO NILES-BEMENT- POND COMPANY, OF JERSEY CITY, NEW JERSEY.

MACHINE-TOOL.

Application filed May 27, 1904, Serial No. 210,024.

more particularly for embodiment in that class of milling machines intended for cutting longitudinal or spiral grooves in taps and drills.

The invention has for its object to increase "the speed and efi'ectiveness of action of the cutters upon the work, to save time in the adjustment of the work in the machine, to insure accuracy in the finished product, and render the same independent of special care or skill on the part of the operator.

the blank lengthwise of the blank. These and other features of the invention will .be made clear by reference to the embodiment thereof illustrated by way of example in the drawings annexed, in which- Figure 1 is a side elevation of a milling machine of the class described, with the lower portion of the column supporting the bed removed and the upper portion of the machine partially in section;v Fig. 2 is a transverse section of the same in a plane intermediate the cutters and the adjustable work-engaging center, and Fig. QFifs a transverse section of an adiustable bracket for one of the cutter spindles. Fig. 3 is a plan of the machine with the cutteractuating shaft and its bracket removed to expose the parts beneath. Fig.4 is a rear end view as Specification of Letters Patent.

Patented May 18, E915.

Renewed November 29, 1905. Serial No. 289,668.

the machine. Fig. his a detail plan view showing the clutch and feed throw-out mechanisms, and Figs. 6 and 7 are, respectively, front and transverse sectional views of the feed throw-out mechanism.

The machine is shown provided .with a. bed 1' supported upon the usual column 2 and provided with a frame 3 carrying the feed-shaft 4 and feed-cam 5 mounted there- 'on, and provided with suitable guide-ways 6 to which are slidably fitted the carriages 7 and 8 for the work-supporting brackets 9 and 10, respectively, these carriages being rigidly connected together by means of the bar 11 through which they are given corresponding sliding movements upon the slidewavs 6 by means of a roller-stud 12 depending from the carriage 7 and entering the cam-groove 13 of the cam-cylinder 5. Upon the frame 3 is'rigidlyi mounted the gearing supporting post 14 with hollow hub 15 and the tool-carrying member comprising the vertical carrying plate 16 whose lower edge rests upon the table of the frame 3 and whose upper portion is supported by the curved braces 17 rising also from the bed 3. The tubular hub 15 is provided with suitable bushings to which is fitted the fixed spindle 18 secured at one end in its socket in the bracket 10 by means of the set screw 19 and having at its opposite endthe conical workengaging center 20 coiiperating with the movable center 21 carried by the sliding spindle 22 in the split barrel 23 of the bracket 9 and provided with the usual operating hand-wheel 24 and clamp provided with the lever 25. To the exterior of the forward endof the hub 15 is fitted a bushing 26 upon'which is mounted the loose sleeve 2 .formed at one end with the cutter actuating gear-wheel 28. The vertical tool-carrying plate 16 is shown provided with four pairs of parallel undercut gibs 29 disposed in direc'tionstangential of the gear-wheel 28 to which are fitted the four sliding cutter spindle-heads 30 each of which is provided with .a threaded hole entered .by an adjusting screw 31 having its end portion'ad acent to thesquare head 32' swiveled to a'forked lug33' formed upon the plate 1'6. Eachoii the brackets 30 isprovided with a cutter spindle .34 mounted in suitable bearings 35 intermediate whichit carries {L-fiXed spiral gear-'36 and is provided upon its opposite lilti upon oneend of which is disposed a spiral gear 39 meshingwith the gear 36 andupon the opposite end a spur gear 40 meshing with the gear 28' upon the sleeve 27. By

reason of the tangential arrangement of the gi-bs 29 in respect ofthe gear 28, a limited adjustment ofJthe cutter-spindle-heads 30 by m ans of the adjusting screws 31 is permitted without materially affecting the intermeshing of the gears 28 and 40, so that-the cutters are capable ofadjustment toward and from the axial line of the centers 20 and 21 without a corresponding adjustment of their entire actuating means.

The common intermediate actuating ear 28 derives its motion from the cutterriving shaft 41 carrying the pulley. 42 by means of a pinion 43 upon said shaft meshing with a gear 44 mounted rigidly upon the hub of the gear 28, whereby motion communicated from the source of power to the pulley 42 is communicated at a reduced speed to the-gear-wheel 28 from which the several cutters derivetheir motion in operating upon the threaded tap or carried by the centers 20 and 21.v

As indicated in Figs. 1 and 3, spindle-'18 is provided in its forward or operative'end portion with a series of longitudinal clearance grooves or cuts 20 corresponding in number and position with the milling cutters 37 in order to, prevent the interference of such spindle with the cutters when in initial relation therewith immediately before and after a groove-cutting operation upon the stock, as the tap a. These clearance cuts are essential, for the reason that the grooves to be cut in a drill or tapnecessarily extend from the extremity of the operative portion of the same, while the spindle or center for sustaining the latter must be of such size as to give the necessary stiflness to insure the proper support of the work. I

- The power for driving the feeding mechanism is communicated through the pulley 45 mounted upon the shaft 46 carrying the loose clutch collars 47 and 48, the former of which is connected withvthe worm-shaft 49 by means of the intermeshing gears50 and 51, and the latter of whichclutch collars is connected with the said worm-shaft by means of the gears 52 and 53 upon the respective shafts and the intermediate gear 54 intermeshing with said gears, Intermediatethe clutch- collars 47 and 48 is disposed the sliding clutch collar 55 splined to the shaft-46 "and provided with an annular groove 56 entered by the spherical end of a pin 57 carried by a shift-lever 58. .The slidthe fixed usual teeth upbn each end which are adapted to interlock alternately with corresponding teeth upon adjacent ends of the loose collars 47 and 48. The gears 50 and 51 and the gears 52, 53 and 54 are soarranged andproportioned that when the sliding collar 55 is in engagement with the collar 47. the worm-shaft 49 will be rotated forwardly at a' comparatively slow speed to produce a feeding movement of the work-holding member, while the shifting of the clutch collar 55 out of engagement with the collar 47 and into engagement with the collar 48 causes the rotation-of the worm-shaft 49 in the reverse direction and at a greatly increased speed to effect the return movement of the work-holding member after a cutting operation.-

The worm-shaft 49 carries a worm 59 which meshes with a worm-wheelf'6O fixed upon the cam-shaft 4 and provided with a radially movable section consisting of a of a link 69 with the shift-lever 58 pivoted at 7 0 to the said bracket 68,"a nd to the outer end of said starting lever is pivoted at 71 a reciprocating cam-rod 72 the beveled head 73 of which is adapted to engage the pin to raise the toothed portion of the block 61 into engagement with the worm 59 when the machine is started.

The rear face of the worm-wheel 60' is provided with an undercut slot 74 to which is fitted the similarly shaped head 75 of ,a screw-stud .76 provided with clamp-nut 77. The screw-stud 76' is circumferentially ad- 'ustable in the slot 74, its path of movement in the rotation of the worm 60 being such as to enable it to engage thetail of a latchlever'78 mounted upon a fixed stud 79 on the frame 3 and having its operative end formed with a hook '80 adapted to engage a tooth 81 upon the outer extremity of the angular portion of the'starting lever 66, a spring 82 being provided to maintain the latch-'lever7 8 normally in engagement with the starting lever 66. v

In each'ofthe v figures of the drawings,

excepting Fig. 4, the several parts of the machine are represented in the positions ing clutch collar 55 is provided with theing shown in full lines iniretracted position,

meavea with the clutch member in engagement with the member l8 for efiecting the backward rotation of the worm 59, the cam-rod 72 being retracted to permit the wormwheel section 63; to drop by gravity or to be forced by engagement of the pin 65 with the stationary cam-piece 83 secured to the frame 3 inwardly toward the cam-shaft iso as to lie out of engagement with the actuating worm as the worm-wheel returns to initial or starting position, in which the work-holding member assumes its initial position with the grooved operative end of the tap ajust beyond the cutters 37 in readiness for removal.

To eii'ect a succeeding operation of the machine, the movable center 21 is backed off by suitable manipulation of the clamp-lever 25 and hand-wheel 2% for the removal of the tap a, which is replaced by an ungrooved tap, when the ,center 21 is advanced upon the same and secured in operative engage inent therewith in the usual manner. The starting lever 66 is then thrown forwardly into the dotted line position represented in Fig. 5, which throws forward the shift lever 58 to couple the clutch collars 4:7 and 55 for communicating to'the Worm-shaft a9 a forward feeding movement, and simultaneously advances the cam rod 72 whose head 73 engages the pin and raises the worm section 61 into engagement with the rotating worm 59, whereby the forward movement of the 'woi'nrwheel 60, cam-shaft 4 and cam 5 are initiated, and the feed of the sliding brackets 9 and 10 commenced to bring the tap into operative relation with the continuously rotating cutters 37. This feeding movement continues until the worm 60 has rotated to the point indicated inFig. a, when its tripping stud 76 engages the latch-lever 78 and tilts the latter in opposition to its spring 82, and thereby releases the starting lever 66, which is returned to initial position under the action of the spring 84 interposed between the same and a pin 85' upon the frame 3. This movement of the starting lever causes the shifting of the clutch-member 55 from engagement with the collar it? to engagement with the collar 48 for reversal of the direction of rotation of the worm-shaft t9 and simultaneously withdraws vthe camrod 72 to remove its head 7 3 from the circular path of movement ofithe pin 65 so as to enable the toothed portion of the wormwheel section 61 to recede fromthe periphery of the worm-wheel under the action of the stationary cam 83 upon the pin 65,-

whereby, as the worm-wheel turns to initial starting position the worm runs out of engagement with. the teeth of the same and the latter comes to rest in readiness for a succeeding operation.

Although the feed throw-out device, comprising the radially movable worm-wheel section 61, and the cam-rod .72 operated manually to shift it into operative position and automatically to permit its return to inoperative position in respect of the body of the worm-wheel, will operate equally well whether the worm 59 rotates continuously in one direction -or alternately in opposite directions, the employment of means for reversing the direction of rotation of the worm, and hence of the cam-shaft, is evidently advantageous as it is thereby made practicable to provide for a feeding movement of the work-supporting member to correspond with the length of tap or other stock to be grooved, the circumferential adjustment of the tripping stud 76 providing for the operation of so much only of the entire length of the cam-groove 13 as is necessary to communicate the requisite feeding movement to the work.

It will be observed that only a single manual actuation of the starting lever 66 is necessary in each operation of the machine, the return of such lever to initial position being eflected'automatically, and the final interruption of the feed-returning movement' being accomplished independently of such automatic shifting of. the lever 66.

While I have shown herein the movable work-engaging center 21 as forming a part of a common form of lathe tail-stock, adjustable upon its bed 7 by means of the usual clamp-bolt 86, it is evident that this may be replaced by a work-holder constructed in accordance with my application Serial 10c No. 207,506, filed May 11,190t, or by any other suitablelor well-known form of workholding member provided with means for rotating the work during the longitudinal feed of the same, so that the operation of the cutters will produce spiral grooves, in case the machine is to be used in making twist-drills.

I have not claimed herein the feeding mechanism herein shown and described, as 11 the same forms the subject of my application, Serial No. 225,617, filed September 23, 1904:. I

Having thus set forth the nature of my invention, what I claim herein is, I

1. A milling machine including in combination, a plurality of rotary cutters symmetrically arranged on independent axes. around a common center,-means for rotating said cutters, means for supporting at 12$ their opposite ends the blanks to be milled, said supporting means including a pair of oppositely arranged blank engaging members and a guide for one of said-members in fixed relation to the plane of and concentric with said cutters and means for producing a relative feeding movement between the cutters and the blanks lengthwise of the latter.

2. A milling machine including in combination, a plurality of rotary cutters sym metrically arranged on independent axes around a common center, means for supporting at their opposite ends the blanks to be milled, said supporting means including a pail-of oppositely arranged blank engagmg members and a guide for one of said members in fixed relation to the plane of and concentric I with said cutters, means mounted on said guide for rotating said cutters, and means for givingthe blankengaging members a feeding movement with relation to the cutters and guide.-

3. A groove milling machine including in combination a plurality of rotary cutters mounted on independent axes to operate in a single plane and-symmetrically arranged around a central line extending at substantially right angles to said plane, means for supporting at their opposite ends the blanks to be groovednsaid supporting means including a pair of oppositelya-rranged rig idly connected blank engaging spindles, a stationary guide member for one of said spindles, located adjacent to the plane of and in concentric relation with saidcutters, means for producing a relative movement between said spindles to engage the blanks and means for simultaneously moving the spindles endwise with relation to the cutters and guide. f N

4. A milling machine including in combination, a work-holding member comprising a pair of rigidly connected brackets, one of which carries a movably mounted work engaging spindle, an intermediate tool.

' carrying member. and provided with a guide disposed in axial alinement with the opening in said tool-carrying member, and a work-engaging spindle fitted to and passing through said guide and the opening in the tool carrying member and rigidly mounted in the otherof said work-holding brackets. 5; In a milling machine, the combination with the frame, a work-holding member comprising a pair, of rigidly connected brackets each carrying ea work-engaging spindle, and an intermediate tool-carrying member comprising a bracket formed with an opening, the one of said members being movable relatively to the other upon said frame, a post provided with a hollow hub through which and the opening in the toolcarrying member one of the work-engaging spindles is projected from itsv holding bracket, an actuating gear mounted upon said hollow-hub, a plurality of cutter spindle-heads mounted upon said, tool-carrying member and provided each with a rotary cutter and connected mechanism com,- prising a gear meshing with said actuating gear, means for rotating said actuating gear,

and means for communicating feeding movements to the said movable member. I

6. In a milling machine, the combination with the frame carrying relativelymovable work-holding and tool-carrying members, of a hub mounted in fixed relation to said tool-carrying member, an actuating gear mounted thereon, a plurality of cntterspindle-heads mounted upon said tool-carrying member and provided each with a cutter and connected mechanism comprising a gear meshing with said actuating gear, said spindle-heads being adjustable each in a di- 'rection tangential to said actuating gear means for driving said actuating gear, an

means for communicating feeding movecutter spindle-heads mounted upon said tool-carrying member adjustably' in directions tangential to said common actuating gear, and meanscfor driving said actuating ear. g 8. In a milling machine, the combination with the frame, of a tool-carrying member comprising a bracket and a guiding hub. in fixed relation. thereto, a plurality of toolcarrying spindles mounted upon said member tangentially in respect of said guiding hub, a rotary tool upon each said spindle in radial relation to said hub, a workholding' member comprising a pair of rigidly connected brackets each carrying a work-engaging spindle the outer portion of one of which is passed through and supported vby said guiding hub and is formed at its outer end with a plurality of clearance cuts each for its respective rotary tool, means for actuat ing said tool-carryin spindles, and means for communicating :teeding movements to one of said members relative to the other.

9. A machine vfor grooving tap blanks and the like, including, in combination, blanksupporting-means including blank-centering members, a plurality of cutters symmetrically" arranged relative to the axis defined by said centering members, -;thecutting planes of said cutters being substantially identical, said centering members being located atv opposite sides of said outtfiarespectively, means for rotating said cutters in unison; and'automatic means tor efiecting a i dependent cutter-carrying spindles, sald pairs being symmetrically arranged with reference to a common center so that thecutters operate in a single plane, means for driving said spindles in unison, blank-supporting means including blank-centering members located at opposite sides of the cutters, and automatic means for effecting a predetermined extent of relative movement between the cutters and the blank lengthwise of the blank.

11. A machine for grooving tap blanks and the like, including, in combinati on,.a plurality of pairs of oppositely arranged independent cutter-carrying spindles, said pairs being symmetrically arranged with reference to a common center so that the cutters operate in a single plane, means for driving said spindles in unison, blank-supporting means including blank-centering members located at opposite sides of the cutters,automatic means for efiecting relative movement between the cutters and the blank in a predetermined direction lengthwise ot' the blank while cutting, and means adapted to a utomatically arrest movement in said direction and cause relative movement between the cutters and the blank lengthwise of said blank in the opposite direction.

12. A machine for grooving tap blanks.

and the like, including, in combination, a plurality of pairs of oppositelyarranged independent cutter-carrying spindles, said pairs being symmetrically arranged with reference to a common center so that the cutters operate in a single plane, means for driving said spindles in unison, blank-supporting means including blank-centering members located at opposite sides of the cutters, automatic means for effecting relative movement between the cutters and the blank in a predetermined direction lengthwise of the blank while cutting, and means adapted to automatically arrest movement in said direction and cause relative movement between the cutters and the'blank lengthwise of said blank in the opposite direction, said last-mentioned means comprising cooperative clutch members, a work-feeding member and trip devices coiiperatively associated with said members.

13. In a tap grooving machine, the combination with a plurality of cutters symmetrically arranged around a center, means for rotating said cutters, means for supporting a tap blank at its opposite ends and on opposite sides of the cutters, said support lng means including a work-engaging spindle having a clearan ce groove for each of said cutters, and means for producing a relative movement between the cutters and.

the blank lengthwise of the blank.

14. In a tap grooving machine, the combination of a plurality of rotary cutters symmetrically arranged around a center,

means including a member arranged concentrically with the cutters for rotating the cutters, means for adjusting the cutters in-, wardly and outwardly with relation to said center, means for supporting a tap blank at its opposite ends and on opposite sides of Copies of this patent may be obtained for five cents each, by addressing the Commissioner" of Patents, Washington, D. C.

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