US2534993A - Automatic bar stock machine - Google Patents

Description

Dec. 19, 1950 E. J. ROBICHAUD 2,534,993

AUTOMATIC BAR STOCK MACHINE Filed Aug. 13, 1945 7 Sheets-Sheet l [N VEN TOR.

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E. J. ROBICHAUD AUTOMATIC BAR STOCK MACHINE Dec. 19, 1950 7 Sheets-Sheet 2 Filed Aug. 15, 1945 INVENTOR.

Dec 19, 1950 E. J. ROBICHAUD AUTOMATIC BAR STOCK MACHINE 7 Sheets-Sheet 3 Filed Aug. 13, 1945 HVVENTDR.

Dec. 19, 1950 E. J. ROBICHAUD 2,534,993

AUTOMATIC BAR STOCK MACHINE )Dm. 319, 1950 E. J. ROBICHAUD AUTOMATIC BAR STOCK MACHINE 7 Sheets-Sheet 5 Filed Aug. 13, 1945 INVENTOR. @MJ M B MGQQ. m,

Deco 19, E950 E. J. ROBICHAUD AUTOMATIC BAR STOCK MACHINE Filed Aug. 15, 19 5 7 SheetsSheet e .IN V EN TOR.

Dec E9 11950 E. J. ROBICHAUD 2,534,993.

AUTOMATIC BAR STOCK MACHINE Filed Aug. 13, 1945 7 Sheets-Sheet 7 iii INVENTOR. imdd%flm= BY $414276? l Patented Dec. 19, 1950 UNITED STATES PATENT OFFICE AUTOMATIC BAR STOCK MACHINE Edmund J. Robichaud, Middietown, Conn, as-

signor to The Billings and Spencer Company, Hartford, Conn. a corporation of Connecticut Application August 13, 1945, Serial No. 610,566

3 Claims. 1

This invention relates to the provision of an automatic bar stock machine and is directed more particularly to such a machine where a bar or bars of stock are fed forwardly and clamped in a rotating spindle so that an object is formed on the end of the bar and then cut off.

According to certain novel features of the invention, the machine is characterized by its rigidity, eiiiciency and ease of operation thereby facilitating maximum production.

According to other novel features of the invention, the various components are related in such a way that ample room is provided to obviate the difficulties usually encountered with chips.

According to another novel feature of the invention, plural work spindles are operated from a common source of power thereby conserving distinguished from single spindle machines.

As further features of the invention, the tool carriers are readily accessible and it is possible to form different pieces on the different spindles simultaneously,

Various and numerous novel objects and advantages will be observed in connection with the following description of the invention in the form at present preferred, it being understood that various changes and modifications may be made without departing from the spirit and scope of the invention.

In the drawings Fig. 1 is a front elevational view of a machine embodying the novel features of the invention; Fig. 2 is an end elevational view of the machine shown in Fig. 1 taken at the power end thereof;

Fig. 3 is a sectional elevational view on the line 33 of Fig. l to illustrate the driving mechanism;

Fig. 4 is a developed sectional plan view on the line 4-4 of Fig. 2;

Fig. 5 is a plan view on the line 55 of Fig. l to illustrate the brake mechanism;

Fig. 6 is an enlarged end view of the overrunning clutch of the driving mechanism;

Fig. '7 is a front elevational view of the brake mechanism shown in Fig. 5 taken outside the line I3-l3 of Fig. 1;

Fig. 14 is a sectional elevational view of the Cal Fig. 19 is a sectional plan View on the line l9--l9 of Fig. 16.

Referring now to the drawings more in detail,

, the invention will be fully described but the machine will first be described in general in connection with Fig. 1 wherein a base construction is indicated by 2.

A power case or housing 4 with which driving mechanism is associated is fixed to the righthand end of the base construction. This may be called the power end of the machine.

A head stock 6 is fixed to the opposite or tool end of the base construction which is connected to the housing 2 by a longitudinal strut 8.

A motor id is fixed to the housing 4 and through mechanism to be described longitudinal inner drive and outer cam shafts are operated therefrom. The outer cam shaft has a cam drum l2 fixed thereto and said shafts extend into the head stock for operating the spindles, etc., all as will later be described.

The cam drum l2 has a cam M for moving a tool slide it for end tools back and forth, a cam 8 for operating stop mechanism for bar stock, a cam 23 for operating high speed clutch mecha nism and associated parts and a brake mechanism 22 all of which will presently be described.

The power mechanism will now be described with particular reference to Figs. 2, 3 and e to 10 me.

A shaft 24 or" the motor has a pulley 26 fixed thereto that is connected by a belt 28 in engagement with a pulley 39 fixed on a shaft 52. This shaft 32 may be called the high speed shaft and it is journalled in inner and outer walls 34 and 36 of the housing, see Fig. 4.

A pinion 38 fixed on shaft 32 is in mesh with an idler 45 rotatable on a stud 4.2 of wall 36. Said idler 483 is in mesh with a gear M fixed on a shaft 45 journ alled in the wall 35. A gear 68 fixed on said shaft 46 meshes with a gear 50 fixed on a shaft 52.

The shaft 52 is journalled in the wall 36 ofthe housing :3 and extends longitudinally into the head stock. It will be called the main drive shaft and is rotated from the motor through the belt-pulley and gearing described at all times while the motor is in operation. v

A pinion 54 fixed on shaft 52, see Fig. 4, meshes .thehigh-speed shaft 32.

with a gear 56 which has a pinion 58 fixed thereto. A gear 6G fixed on a shaft 62, rotatable in the housing wall 36, is in mesh with the pinion 58 and saidshaft has a gear 64 fixed thereto which is in mesh with a pinion 65 of an. inner clutch member 50 which is rotatable in the wall 36.

Thus through the belt pulley and gear connections described, the clutch member 68 is r tated when the motor is in operation.

The clutch member rotatably receives an end of a shaft which has its opposite end journalled in the wall 34. Said shaft may be called the low-speed feed shaft.

A friction clutch mechanism I2 which may be called"thezhigh-speed clutch is associated with This may be of usual form adapted when engaged to clutch-a sprocket 14; to said shaft: 32-asa collar part f5 thereof is moveddownwardly into olutching'position by a rod i8 which is slidable back and forth relative towall 34.

A-chain8-5 is in engagement with sprocket i i and with a sprocket 82 associated with an outer part, E l-of theoverrunning clutch 86 of which inner part 68 is a component.

A friction clutch 83-operableby a collar 90 has a part carrying a sprocket 92. The clutch 88 ,may be of any wellknown type adapted as its collar: 98. ismoved back and forth toengage and disengage the sprockets 82 and '82.

' Theoverrun-ingclutch, best shown in includes the usual inner membersfdfiahaving the inclined sockets-SE and rolls eli.

When the high-speed clutch 12 connects the sprocket 5:3 to the high-speed shaft 32 and the clutch ilSis engaged, the sprocket 92 is'driven at high speed and the outer member 84 of the overrunning clutch overruns the inner member 68 thereof which is driven through the gearing. When clutch 72 is disengaged the sprocket 92 is driven at low speed through the gearing and overrunning clutch '86.

A hollow shaft I69 surrounding the shaft 52 and called the cam-shaft has an end journalled in housing wall 3 t, see Fig; 4, with a gear 82 fixed thereon. A spider I84 rotatable on the shaft IL 8 has pinions I08 which are in mesh witha gear I58 fixed to wall 34 in any convenient manner and in mesh with gear I82.

A sprocket H8 is frictionally engaged be tween spider IS E and a plate II? and is .connested-by a chain I i to sprocket 02. The gears I02 and I86 are preferably provided with fiftyeight and fifty-six teeth respectively. The frictional action of the members I3 2, HE: and H2 may be varied by means of adjusting screws, and as the sprocket H0 is rotated the spider. IE is driven through friction so that through the pinions and gear U38 the gear I82 is driven to rotate the cam shaft at'high or low speed accordingly as high speed clutch is-engaged or disengaged.

It is desired to provide means for hand cranking sprocket 92 and thereby the cam shaft and to that end the following is provided, see Figs. 4, 9 and 10.

A gear H8 is fast to sprocket 92 whichmeshes with a, pinion I that is rotatable with a gear I22 on a shaft I24 of the housing. An idler gear I26 is in mesh with gear I22 on a shaft I28 which 3;

is slidable in the housing. A spring pressed detent I30 is spring pressed, as shown, into engagement with circumferential grooves I32 of shaft I28.

'A connected together pinion I34 and sprocket axis of the "shafts 52 and I00.

I36 are rotatable on a stud I38 and the said sprocket is connected by a chain I40 to a sprocket I42 fixed to a shaft I44 which is rotatable in the housing. A crank, I46 is provided on said shaft I44.

A transverse shaft I48 is oscillatable in the housing and carries a fork I50 in engagement with the part 90 of the clutch 88. An arm I52 is fixed on said shaft I48 as are operating levers I 54 on opposite ends thereof.

With the parts as shown in Figs. 9 and 10, the shaft I48 may not be oscillated to clutch engaging position, or counterclockwise as the arm I52 will on such movement of the shaft I48 bring up against idler I26. In this position the gear I-I'Band sprocket 92 may be rotated through the gearing and sprocket-chain connections by ro- Thus clutch 88 cannot be engaged while the camshaft I00 is being hand-cranked and thecranking-mechanism is inoperative w-hen clutch88 is engaged.

The spindle mechanism and driving arrangement therefor will be described in connection with-Figs. 14 to 19 inc.

The head stockli includes a housing having inner and outer-walls I and I62, side walls I64 .and a rearwardly extending part I 66 with a cover I68 around the upper part thereof.

The cam shaft I00 is journalled in the wall I60 and the end of themaindrive shaft 52 extends .ttherebeyond and is journalled in an anti-friction bearing I10 of wall I62. A stationary: shaft I12 -is carried by the wall 'I62.and extension: I66, as :shown, and will beheld against movement by any suitable means,- such asa set screw; in thepart 1266 in engagement therewith.

Anupper cam shaft I14 and a lower cam shaft I 16 are journalled at opposite ends in the walls I60 and I62.

Upper and lower cross-slides I 18-and :I80- are slidable back-and forth-between'gibs IBZ-associated with the wall- I60v and transversely of the The upper slide I18 may bethe cut-off slide and is providedwith pads I84 provided with T-slots I 86 in whiqh cutoff tools or tool holders may be clamped. This cut-off slide moves back and forth and as'ait moves to the left in Fi 16 tools carried thereby may operate, on a bar of stock carried by spindles S to cut-01f an object formed on the end portion thereof.

The lower. slide I80 may be the forming slide and isprovided with pads 188. having I -slots lag in which tools or tool holders may be I clamped. As this slide movesto the right in Fig.

Cam discs I92 are fixed tothe shafts I14. and

= HEB-for operating the slides described. These cam discs may have outer and inner cam members dim-and 466 secured to the face thereof toprovide a roll groove. A gear such as I98 is associated with each cam which meshes with agear fixed on the camshaft I00.

The gears 188 are provided with a plurality of bolt receiving holes 200' andthe cam discsare provided with tapped holes 284. .The holes of the gears and of the cams are spaced so that a certain hole of a gear and cam may receive a bolt 206. In that way the angular relation of a gear and cam may be varied to vary the "timing or operation of a cam.

i The slides have rearwardly projecting hubs 208 extending through slots 209 in wall I60 which carry studs 2H1 on which are cam rolls 2I2 eng-ageable by the cams I94 and I 96, see Fig. 17. As the cams are rotated the forming and cut-01f slides are moved back and forth.

The spindles S are rotatable on axes disposed at either side of the shafts 52 and I12, see Fig. .15. The spindles may be of usual form having hollow collets 2M in their forward ends that are ;contracted to grip a bar of stock and allowed to .xpand to release said bar. Said spindles are .journalled in the walls I62 and I62 by means of anti-friction bearings 2I6 and 2I 8, as shown.

Stock feed tubes 258 and H8 extend from the outer rear ends of the hollow spindles and through bearings 22B and have grooved collars I222 on the outer ends thereof. Grooved collars .222 on the spindles S are associated with the draw tubes thereof for contracting the collets.

A member 225 slidable back and forth on the shaft I12 has fingers 22E engaging the grooves .of collars 222 and a member 228 slidable on said shaft has fingers 236 engaging the grooves of collars 224. As the member 225 is moved forwardly or to the right in Fig. 15 the bars of stock are fed forwardly in the spindles. As the member 228 is moved rearwardly or to the left -in said figure the collets are contracted for gripping the bars for rotation thereof.

Rolls 22'! and 229 are provided on the slidable members 226 and 228. A tension spring 232 has opposite ends connected by members 236 and 238 to the slidable member 226 and the wall It2,

as 'shown in Fig. 14. This spring urges roll 221 into engagement with a cam pad 245 ofa cam drum 242 which is fixed on shaft I14.

Cam pads 244 and 245 on said cam drum 242 T ct on roll 229 to move member 228 back and forth. A gear 248 on shaft 52 meshes with gears 2563 on the spindles S, see Fig. 15 and as said shaft rotates the said spindles are rotated. Likewise when the cam shaft I is rotated the upper and lower shafts i1 3 and lit are rotated thereby to move the slides back and forth while the collet and stop screws 25%] are adjustable in said straps which have end portions 262 receivable in holes in'the slides. At the other ends of the slide screws 2% which are adjustable in blocks 266 carried by the slides have flanges 268 between which and abutments 21?} secured to the wall I52 are springs 210. ---The members 22 3 of the spindles for operating the spindle collets may be manually operated as in Fig. 15. Shafts 216 having squared outer ends 218 for receiving a hand lever and have levers 28!! secured to inner ends thereof which carry rolls 232 disposed in grooves of the members 224. By oscillating shafts 276 the members may be moved back and forth to open and close the collets.

Stop means for the bars of stock in the spindles will now be described with reference to Figs. 1, 11 and 12.

The strut 8 is provided with longitudinal grooves 286 on its opposite sides in which tongues 28'! of brackets 238 are slidable. Screws 290 receivable in holes 292 in the strut are provided to clamp the brackets 288 in adjusted positions. The brackets have generally vertically disposed guides 294 in which there are guideways for slides 296 with plates 228 overlying the guideways. A crank 30B is pivoted at 392 to ears 304 of the brackets 294 and lower arms 3M of the crank have end portions that are receivable in sockets 3% of the stop slides 296. Springs 308 in grooves 3H3 at one side of the slides are disposed above screws 3I2 of the brackets to urge the slides upwardly.

The lower ends of the stop slides 296 are arranged when the slides are in lower stop positions to lie in front of the spindles S and against which the ends of the bars of stock abut thereby to stop feeding of the bars and position them for the machining operation.

The crank is swung counterclockwise to move the stop slides downwardly while the springs tend to urge the slides upwardly. The brackets 238 are adjustable back and forth to vary the length of feed of the bars of stock.

A rod 308 is slidable in bearings 31! of the strut 8, see Fig. 1. One end of the said rod carries a cam roll 3I2 which is operably related to the cam I8 and its other end is pivotally connected to a link 3Ii which in turn is pivotally connected to crank 306. Various holes are provided in the link 3M, as shown, for connecting to the crank 36! to accommodate adjustment of the brackets 288. As the cam I8 rotates the rod 328 is reciprocated to bring about swinging of crank 36!! thereby to operate the stops 2%.

The slide I6 for the end tools will now be described with particular reference to Figs. 1 and 13.

The said slide I6 is slidable between gibs 320 and it has an upper head portion 322 through which the cam shaft I08 and drive shaft 52 extend. -T-slots 324 in opposite sides of the 'head are provided in which a tool-holder or toolmay be secured for operating on the ends of bars of stock in the spindles. A roll 325, see Fig. l, is carried by said slide I6 which is in engagement with cam Id. The rotation of the cam moves the slide back and forth to bring the tools carried thereby into the bars of stock.

The brake mechanism will now be described with reference to Figs. 1, 4, 7 and 8.

A brake drum 33B is associated with the cam drum I2 rearwardly of cam 22 thereof and a brake band 332 is in frictional engagement therewith. A lever 334 is pivoted at 336 to the wall 34 and has an upper arm 332 and a lower arm 340. A rod 342 secured to one end of the brake band passes through lever part 338 and a spring 344 is disposed thereon between lever part 338 and nuts 346. The other end of the brake band is connected to the lower end 346 of the lever 334.

A manually engageabie lever 2% is swingable at 352 in a horizontal plane and is connected at V 352 to rod f2 for operating the high speed clutch characteristics thereof.

swinging-it counterclockwise for applying the brake.

A latch 36!) is pivoted at 352 and has an outer end for latching over and holding the lever 368 against swinging outwardly, see Fig. 8. A roll 364 on the inner end of the latch lever 368 is engageable by a cam patch 36% on cam 26 and as the cam rotates the latch is operated to release lever 348.

A spring pressed detent 368 acts on the latch lever 38!! to urge it downwardly into latching position.

The operation of the machine will now be described it being understood that the motor 10 is in operation and that bars of stock are clamped in the spindles S with inner ends thereof projecting outwardly for engagement by the tools for the machining operation.

' The shaft 52 is driven through the gearing so that the spindles are rotated according to speed depending upon the gearing ratios.

The high speed clutch 1?. is disengaged so that shaft lilthrough the overrunning clutch and soaring is rotated at low speed to rotate. cam shaft lilfl at low speed whereby the formin end tool slide and cut-off slide are operated in timed a the collets are expanded and the bars of stock are fed forwardly in the spindles S. The cam 18 operates the stop mechanism so that the stops 296 are in position in front of the bars of stock being advanced. Then the collets are contracted to grip the bars of stock.

With the bars of stock presenting inner ends beyond the spindles and on which objects are to be formed, the cam 29 operates lever 348 which through rod 78 disengages the high speed. clutch 12 so that the shaft '56 and thereby the cam shaft [QB will be operated at low speed throu h the gearing and overrunning clutch. As rod '58 disengages the high speed clutch the cam 35 thereof acts on lever 334 to apply the brake band 332 thereby to retard cam shaft Hill as the driving connections are shifted from high to low speed operation.

The invention may be embodied in other speific forms without departing from the essential Hence, the present embodiments are therefore to be considered in all aspects merely as being illustrative and not as being restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all modifications and variations as fall within the meaning, and

. purview and range of equivalency of the appended necting said drive shaft and spindles, upper and lower secondary cam shafts and gearing connecting the same to said main cam shaft, and cams on said secondary cam shafts for operating said tool carriers, a stop cam on said main cam shaft and connections between said cam and work stops, drive mechanism for said drive, and main cam shafts including speed changing means for rotating the latter alternately at high and low speeds, and means operable by said main cam shaft for actuating said speed changing means.

2., Operating mechanism for a machine tool having spaced work spindles and tool carriers slidable transversely relative thereto and work stops movable in and out forwardly of said spindles comprising in combination, concentric relatively rotatable drive and main cam shafts in parallelism with said spindles, gearing connecting said drive shaft and spindles, upper and lower secondary cam shafts and gearing connecting the same to said main cam shaft, and cams on said secondary cam shafts for operating said tool carriers, a stop cam on said main cam shaft and connections between said cam and work stops, drive mechanism for said drive and main cam shafts including speed changing means for rotating the latter alternately at high and low speeds, and means operable by said main cam shaft for actuating said speed changing means, a brake drum rotatable with said stop cam and brake means engageable therewith, and means for operating said brake means.

Operating mechanism for a machine tool having spaced work spindles and tool carriers slidable transversely relative thereto and work stops movable in and out forwardly of said spindles comprising in combination, concentric relatively rotatable drive and main cam shafts in parallelism with said spindles, gearing connecting said drive shaft and spindles, upper and lower secondary cam shafts and gearing connecting the same to said main cam shaft, and cams on said secondary cam shafts for operating said tool carriers, a stop cam on said main cam shaft and connections between said cam and work stops, drive mechanism for said drive and main cam shafts including speed changing means for rotating the latter alternately at high and low speeds, and means operable by said main cam shaft for actuating said speed changing means, a brake drum rotatable with said stop cam and brake means engageable therewith, and means for operating said brake means actuated by said main cam shaft,

EDMUND J. ROBICI-IAUD.

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

UNITED STATES PATENTS Number Name Date 2,118,014 Montgomery et a1. May 17, 1938 2,201,182 Kelley May 21, 1940 2,201,183 Kelley May 21, 1940 2,255,170 Kelley Sept. 9, 1941 2,270,310 Kelley -i Jan. 20, 1942 2,323,663 Kelley July 6, 1943 2,346,032 Kinnuian Apr. 4, 1944 2,358,151 McConnell Jan. 20, 1945

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