US2454269A - Milling machine - Google Patents

Description

Nov. 23, 1948-- H. M. BRAUCHER MILLING MACHINE 3 Sheets-Sheet 1 Filed Aug. 12, 1944 0.27M; am

Nov. 23, 1948. H. M. BRAUCHER MILLING MACHINE 3 Sheets-Sheet 2 Filed Aug. 12, 1944 I Hur'vgy M-Exrnuche1- 3% a amwk 4 Ndv. 23, 1948. H. BRAUCHER MILLING MACHINE 3 Sheets-Sheet Filed Aug. 12, 1944 Patented Nov. 23, 1948 UNITED STATES PATENT OFFICE MILLING MACHINE Harvey Braucher, Baltimore, Md. Application August 12, 1944, Serial No. 549,243

(Granted under the act of March 3, 1883, as amended April 30, 1928; 370 0. G. 757) Claims.

The invention described herein may be manufactured and used by or for the Government for governmental purposes without the payment to me of any royalty thereon. My invention relates to milling or work processing machines and more particularly to machines for milling or processing the ends of cartridge cups.

At the present time improperly drawn cartridge cups are produced and many of such cups accumulate at the arsenals. A primary object of my invention contemplates the reconditionmg and. correcting of these improperly shaped cups within the limits of Government specifications whereby the cups do not have to be sent back to the copper companies to be remelted and converted a second time into bars to be again-formed into cartridge cups.

A further object is to provide a semi-automatic machine with novel features to mill the open ends of cartridge cups.

A still further object is to provlde means whereby cups of varying height may be reconditioned.

Another object is to provide a novel cutter and dial feed arrangement.

Other advantages and objects will be apparent from the following description in which like numerals designate like parts in all views.

Figure 1 is a side elevational view of the milling machine with a portion of the driving belt broken away.

Figure 2 is a top plan view of the power transmitter anddial feed broken away to show the sliding clamp members and pusher member.

Figure 3 is a view taken on the line 3-3 of Figure 1.

Figure 4 is a fragmentary view taken on the line 4--4 of Fig. 3.

Figure 5 is a fragmentary view of the cam mounted on a bracket for providing reciprocating movement to the cutter. I

Figure 6 is a fragmentary top plan view of the connecting link shown in position in Fig. 1.

Figure 7 is a perspective view of the dial operating cam, and

Figure 8 is a fragmentary perspective view of the pocketed dial member and guiding plate for the sliding clamp members.

In the drawings 8 designates the base of the machine on which a power transmitter 9 is mounted and I0 is a pedestal on which is arranged a rotatable cartridge cup dial feed I I. A

nection means with the power transmitter 9.

The power transmitter receives its power from a belt I9 or any suitable means and the reciprocat ing movement is obtained from a take-01f 20 (Fig. 2) on said power transmitter. A vertical drive shaft 2i extends upwardly from said takeofi where it is geared at 22 to gear 23 of a horizontal drive shaft 24, said shafts 2| and 24 being supported by bracket 25 carried by a main support 26 (Fig. 2). At the opposite end of this shaft 24 is a cam 21 arranged within a yoke 28. Stems'29 and 30 are carried by said yoke, the stem 29 being guided in the bracket I6. The lower stem 30 is secured to a coupling member which will be described at a later point.

Rotatable movementto the cutter I4 is given through a take-off 3| meshing with a gear 32 near the bottom of a vertical shaft 33 journalled in the bearing 34. This shaft rigidly supported by bracket 94 mounted on the upright carries a sprocket 35 and a driving chain 36 connects said sprocket 35 to a second sprocket 31 carried on the sprocket hub 38 of the cutter I4. The inner surface of the hub 38 is fitted with keyways in which are mounted'keys 39 which are keyed to the spindle member 42 for providing rotary movement to the cutter. The cutter I4 is fitted with the cutting tool 40 which is adjustably and resiliently mounted in said cutter to provide a touch milling feature.

Numeral 42 denotes a bushing in which rotates and slides the spindle 42. This spindle is connected to the stem 30 through a coupling joint 43 and 44 secured together by fastening means 45. The part 43 is secured to stem 30 in any suitable manner and may be held by a set screw 43 and part 44 is shouldered to fita groove 46 in spindle 42. The member 44 further serves as a thrust bearing for the spindle.

The cutting tool 40 is bolted to a plunger 41 whichcan slide inside the spindle 42 but is limited in its travel by drive pin 48 extending through the plunger stem 41' and a slotted hole 4B in the spindle 42. One end of a compression spring 49 bears against an internal shoulder 50 in the spindle 42 and the other end bears against an adjustable nut 5| threaded on the plunger stem 41'. The combination of the nut 5|, spring 49 and drive pin 43 gives the cutting tool 48 the' fbalance and pressure necessary to produce 'the'd'esiredcut. Also, the arrangement permits the use of various size cups. In the ordinary milling machine products identical in dimensions are produced while in the present-invention dimensions may vary but the weights must be nominally the same. i

A low speed shaft extension 52 is connected to the power transmitter 9 by a crank disc 53 to impart intermittent motion to the dial feed I"! through a pawl and ratchet movement. 'I he crank pin is indicated at 54 and the r'o'dt f m'a'y be made adjustable to permit close adjustment in the length of the rod. A wrist pin 55 pass-es through the "rod" 52 and a "forked link 56, while a pivot pin 53 (Fig. 6) connects the'link to a'pa'wl "arm 51.

pedestal it to 'trahshiit"power froma ratchet wheel til 'to' thef'dialiil by 'means'of fastenings "62. bu's'hingfonthefhub' of said'spider is shown at 63, and on 'thebutsidebf' said hub 59 isa key "64" whereby said spider59 and ratchet I 69 are 'coupledtogether.

arm 5lfby a bolttfi and is freeto turn. On the underside Off the stationary'housing i2 is fastened an arm 158 "and aten'sion'spring 69 is hooked toa stud 70 carried bysaid "arm-and to a stud (il car'ried by a pay/1 66wherebyfthe'pawl isheld against "the t'eethfitl *ofthe' ratchet wheel '60.

"Inside'the stationary housing -l2"is a dial ring "H which-is stationary andthe cartridge cups ride "en the 'top -of thisring. I-he inside-wall of the ring H is shaped to form an ecCentric-c m H in order to ho-ld the sliding clamp mem-bers '14- open when the-"cups lm are 'i-n's'e'rt'ed'--i-n the -pocke'ts 0f the dial '6! and -t0' @ll'ilit th OUilWaTd mDVB- 'ment of the-pusher 48=and clamps "I4 opposite the cutter When'the cup'is to be firmly gripped.

T'he sliding olar np members 14 Work in guides 14"-form'ed'by guide walls' lli on the dial 6|. The

dial 6! is extended -at- 6 I to form'- a-lip' wherein the pockets 15 are formed. These guides l4' a're merely eXtensi-ons'of the cup receiyingpockets 15. A'lso,'-"t'he"sliding clamps-are preferably formed 'with a concavev fa'ce 93 to conform-to the configuration of the cups. The combination of the wall I of the ring TI, and inner wall of the plate til-and also member 18 serves toact as a track whereby the movement-of the clamps-is guided to and away from the cartridge cups.

- Tothe upper end'of "the pedestal iskeyed at it (Fig. -2)-a spring arm leinto which a pusher H works. 1 This pusher member-is provided with around stem anda convexhead 1'8 and a compressionspring 19 urges-the pusher against the end of a sliding clamp 'I4 Whereby to grip a cup tightly while it is being milled. The head of the pusher acts as a camto nose the clamps outwardly as they approach the milling or cutting position. The eccentricity of 'theinn'er w'all"'l'i of the' d'ial ring irpermits this outward movement. A'plate 89 serves asa'n innerg'uide for the clamps, but'is cut a'WayatfB O' to provide for the" w'orkingpf the member 11 wherethe head c'am*head ilil is' held against the roller 82.

--ing cutter 4i). in its pocket in an upright position the cutter de- 18 takes over and serves to act as the guide. The plate (Fig. 8) overlaps a flange 90 and guide lugs 9| are carried by said plate.

To bring each cup to a stop directly under the milling cutter there must be no drift in the dial movement. To prevent such drift a stop device is mounted under the-ratchet wheel. Projecting downwardly from said wheel are a series of pins or studs 8| equally spaced in a circle and in number corresponding to the pockets in the dial 6|. A roller 82 is mounted on the outer end of the'pawl arm 51. A bracket 83 (Fig. l) bolted to the undersidecf the housing [2 provides a pivotal connection 84' for a cam member'84. A secbndbracket 85 is secured to the housing l2 and' a tension spring 86 connects said bracket with a dependin stud 87' carried by the cam 84 whereby th regular cut-out portion 8'! of the The outline of the cam surface 81 produces the desired-holding andreleasing effects. On theior- '-"wardstroke of the connecting rod the pawl turns the ratchet wheel until a pin Si isstoppedand held by the cam head 88. As the connecting r'od' 52 approachesthe end of the return stroke roller 82 pushes the cam out of the path of the pin and continues-to holdit that way for the early on the table whence they are placed 'upright by hand-in the-pockets of the'dial' feed. The'dial turns intermittently thereby carrying the cups successively under the continuously rotating mill- With the cupat'rest andjgripped scends thru opera'tion'of the"'cam'member"21 and trims-the cup end. The'amount of metal removed is small so that'the weight of "the 'cupremains within the limits set forth in its" specifications.

Afterthe milling operationthe cuttenrises, the dial feed advances a st'epand as-the 'cupad- Vancesi't'isreleased and discharged by gravity through a'h'ole 92 in "ring 11' and housing 42'- and another c'up advances underthe'cutte'r for its trimmin operation.

The drive shafts are-all connected'to one prime mover in such a manner as to give the desired speeds "so that "the movements of the dial'and milling cutter are always insynchronism.

It is to be understood that'while Ihave shown and described what is a preferred embodiment of my invention various changes in the shape;size, arrangement of parts may be'r'esorted'tdwithout departing from the spirit of my-invention and scope of the sum oin'e'd' claims.

' I claim:

1. In a machine forproce'ss'ing workpieces wherein ap'rocessing tool is moved intermittently into work engaging "position, a-work holder comprising a stationary housing,-- a stationary-dial ring in said housing, a rotatable dial and means for'rot'ating it with a'step-by-step movementsaid dial being provided with a plurality of inwardly opening radially arranged recesses -Whose outer ends overlie the dial ring and together Withsaid ring form pockets for the work-pieces, said dial ring being provided adjacent a point of stoppage of said' dial with a cutaway portion, a slidab'le work holding clamp in each recess arranged to 5 be moved at the point of stoppage 0f the dial to clamp the work piece, each clamp being provided with a shoulder in engagement with the inner periphery of said dial ring to hold said clamps open except when opposite the cutaway portion of the ring, and means for moving said clamp members to clamp the work when opposite said cutaway portion, said cutaway portion of the ring being so shaped as to actuate the clamps to cause them to release the work pieces upon movement of the dial beyond the processing station of the work piece.

2. The invention of claim 1 characterized in that the means for moving the clamp members into work clamping position comprises a springbacked cam.

3. The invention of claim 1 characterized in that there is a plate within the dial ring rotatable with said dial for at least partially supporting the slidable clamp members.

4. The invention of claim 1 characterized in that there is a stationary plate within the dial ring for limiting the inward movement of the clamp members except at the point at which said clamp members are actuated to clamp the work piece.

5. In a machine for processing work pieces, wherein a processing tool is moved intermittently into work engaging position, a work holder comprising a stationary housing, a shaft vertically disposed with respect to said housing, a spider rotatably mounted on said shaft, a dial secured 6 to said spider and provided with a plurality of inwardly opening recesses, a stationary dial ring underlying the outer ends of the recesses which with said outer ends form pockets for the work piece, a slidable work clamping member in each recess, pawl and rachet mechanism for rotating the spider and consequently the dial, with a stepby-step movement, cam means for actuating the clamp members at points of stoppage of the dial for clamping the work piece while being operated upon by the processing tool, and means carried by the dial ring for locking the clamp members in open position after they have passed beyond the processing station of the work pieces.

HARVEY M. BRAUCHER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 506,620 Bemis Oct. 10, 1893 1,115,348 Taylor Oct. 27, 1914 1,285,820 Smith et a1. Nov. 26, 1918 1,779,674 Johnson Oct. 28, 1930 1,938,939 Smith Dec. 12, 1933 2,156,941 Hart May 2, 1939 2,170,501 Klamp et a1 Aug. 22, 1939 2,853,480 Marsilius July 11, 1944 2,359,931 Momtt Oct. 10, 1944 2,361,091 Edelmann et al. Oct. 24, 1944

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