US963691A

US963691A - Metal-working machine.

Info

Publication number: US963691A
Application number: US29187205A
Authority: US
Inventors: William S Davenport
Original assignee: Individual
Current assignee: Individual
Priority date: 1905-12-15
Filing date: 1905-12-15
Publication date: 1910-07-05
Anticipated expiration: 1927-07-05

Description

W. S. DAVENPORT. METAL WORKING MAGHINB. APPLIOATIOH FILED DEO.15, 1905.

Patented July 5,1910.

10 SHEETS-SHEET 1.

Ziwz W. S. DAVENPORT.

METAL WORKING MACHINE.

APPLICATION nun 1:20.15, 1905.

Patented July 5, 1910.

10 SHEETS-SHEET 2.

W. s. DAVENPORT.

METAL WORKING MACHINE.

APPLICATION FILED 11110.15, 1905.

Patented July 5, 1910.

10 SHEETS-SHEET 3.

W. S. wDM/ENPORT. METAL WORKING MACHINE.

. APPLICATION FILED D20. 15, 1!?05. Patented 5, 4

10 SHEETS-SHEET 4.

W. S. DAVENPORT.

METAL WORKING MACHINE.

YAPPLIOATION FILED DEO.15, 1905.

Patented July 5, 1910.

10 SHEETS-811E111: 5.

W. S. DAVENPORT. METAL WORKING MACHINE.

. APPLICATION FILED DBO.15, 1905. Patented 5 10 SHEETS-SHEET 6.

9. M QWMMJ 7 .4 9}

W.- s. DAVENPORT.

METAL WORKING MACHINE.

APPLICATION FILED DEO.15, 1905.

Patented July 5, 1910.

I 10 SHEE'IlS-EHEET 7.

W. S. DAVENPORT. METAL WORKING MACHINE. APPLIUATION FILED 1130.15, 1905.

Patented July 5,1910.

10 SHEETSSHEET 8.

(Juvcul'ot 7 M MW W. S. DAVENPORT. METAL wonmu momma. APPLICATION FILED DBOQ 16, 1906.

963,691. I Patented July 5,1910.

10 SHEETS-SHEET 9.

W; S. DAVENPORT. METAL WORKING MACHINE.

APPLIOATIOH rn-nn DBO.15, 1905. v

I Patented July 5, 1910.

10 BHEETSSHEET 10.

UNITED STATES PATENT OFFICE.

WILLIAM SQDAVENPORT, 0F SPRINGFIELD, MASSACHUSETTS.

METAL-WORKING MACHINE.

Specification of Letters Patent.

Patented July 5, 1910.

Application filed December 15, 1905. Serial No. 291,872.

' ranged with relation to the various cutting tools that the work carried by the different spindles is simultaneously presented to different tools and the work carried by each spindle is presented in succession to each of the cutting tools by successive indexing movements of the work carrying spindles.

The primary object of the present invention is to produce a machine of this type in which the idle movements of the machine are eliminated as far as possible or reduced to .a minimunn'so that the work Ina be produced at the maximum speed an to also provide a machine in which the difierent tools may be fed and operatedin such manner thateach shall work under the conditions requisite for its most efficient and accurate action, thus insuring work of a high degree of excellence.

A further object is'to provide, for eliminating any possible errors due to inaccumoms in the construction and arrangement of the work, carrying spindles. which may occur in-the manufactureof the machine or Y may develop by reason of wear so that'the accurate duplication of the pieces of work is insured. V

In prior. machines of the multiple spindle type it has been customary to open the s indle chuck which holds the rod of stock, eed the stock, and then close the chuck before beginning to index the head which. carries a series of work spindles. In practicing the present invention the loss of time involved m thus performing these operations is elimi-. nated by opening and closing the s indle chuck and feedin the rod of stock uring the indexing of t espindle carrying head. The time. consumed in indexing the head and in performing the operations of opening and closing the'chu'ck and feeding the stock,

are also reduced to the minimum and at the same time the indexing efficiently and accurately performed by performing the indexmg by a crank motion which starts the spindle carrying head slowly, moves it at high speed at the .middle of the indexing and brings the head gradually to rest at the end of the indexing.

Heretofore it has been customary to drive the spindles of a multiple spindle screw machine by means of a gear arranged in the center of the spindle carrying head and engaging gears connected with the different spindles, the shaft for the driving gear extending longitudinally of the machine toward the right where it is driven through a. pulley connected by a belt with the- In this construction the colmtershafting.

1S inconveniently arranged and its ulley and gearing, is such as to prevent the'arrangement of the other parts of the machine to the best advantage. In practicing my invention I overcome the objections to this construction and arrangement, by driving the work carrying spindles from an annular or ring gear which surrounds and engages all of the spindle gears and is in turn driven by a pinion engaging the gear teeth formed on its outer periphery. The pinion is in turn driven by a system of change gears from a driving pulley arranged atthe back of the machine where it does not interfere with the most effective arrangement of other parts of the machine. In embodying this feature of the invention in an efficient and simple construction I provide the annular gear with an inner bearing surface or tread which engages and is supported by the hubs of the-spindle gears, the bearing tread for the annular gear and the bearing surfaces of the hubs of the spindle gears coinciding with the respective pitch ocatlon, as well as the location of the shaft surfaces of the gears, so that the spindle.

gears form a'roller bearing PEOIKJQhe annular gear. vBy employing change gears for varying the speed of the spindle gear drive, the full belt power is at .all times utilized which is not the case where cone pulleysof varying diameters areemployedas is the renal practice in multiple spindle screw machmes', and thus the desired speed of the spindles can be readil obtained while maintaining a highly e cient drive for the spindles.

In multiple spindle machines a considerable portion of the work of forming the articles being made is done by what are termed forming tools which are moved radially towardthe center or axis of the work in op-. erating thereon. Since each of the work I carrying spindles presents the work carried thereby to each of the radially moving formin tools any variation in the osition actly the same. To overcome any possible inaccuracy in diiferent pieces of work due to any inaccuracy in the mounting of the spindles in the spindle carrying head, I have provided rectifying means for eliminating such inaccuracies and insurin produced from the stocfi s indles shall beaccurate orm of re'ctifyin means which I prefer to employ consists 0 rectifying stops for each of the work carrying spindlesagainst which carried by the .the tool carriers or some part connected with them abut when the tools are moved into position'for finishing the work to size. If a a single cross tool 1s employed in the 'machine there will be a single rectifying stop corresponding to each work s indle. These stops may be of any form an may be connected wlth, or may be secured to, or may beformed on the s indle head in any manner, so that a stop is rought into operative n Ition or relation when the correspon g spindle is brought into operative relation to e tool., These stops will, be adjusted or v groimd so that'the cutting edge of the formchange to recti mg tool will be exactly the same distance from the center of each work carryin dle'when, the tool isin its advance position. 7 -When the stops have been thus ground or adjusted theyremain unaltered unlesskwear u on the machine requires a 7 any inaccuracies developzd bysuch wear." In c'ase'there are a num r o radially moving in the machine t e number of rectifying stopsforfle'ach spindle will correspond to the number of cross toolsfemp'l yed.

vAnother important feature of the machine embodying my invention isthe construct-ion and mode of operation which' insures the production of good threaded work and also prolongs the'life of the dies for cutting the thread. It is desirable. that the speed of rotation of the work relative to the and also because these tools 'well lubricated. To accomplish this end I that the pieces duplicates. .The"

spin;

or cross tools employed cuttin tools should be much slower for the threa ing di es'than for other cuttin tools, mainly because the chip taking is eavier cannot be as rotate the spindles carrying the work in the usual direction for lathe work and rotate the die orta in the same direction but at a slower speed preferably at about threequarters the speed of the s indle, thus making the relative rotation of the spindle with respect to the die about one-fourth the speed of the spindle. In this way a smooth thread is cut and the life of the die is prolonged the work being done .in the same length 0' time that the other toolsvare the reason that the feed of the other tools is much slower per revolution of the spindle. For withdrawing or unscrewing the die or tap at the completion of the threading operation, I rotate the die the same direction as the spindle but at a faster speed, preferably at five-fourths of the speed of the spindle the relative speeds bein the same as when threading but with t e die unscrewing instead of screwing on.

It is important to the commercial success of a machine such as a multiple spindle screw machine that the machine should be ada ted to doa lar e variety of work with the east number or special cams and parts and with as little removal and change of parts as practicable. It is also important that the threading die or tap should follow thelead of the screw being cut in order thatthe thread cutting may be accurately and uniformly performed. In practiciclg my invention I provide for properly fee in 'the die or tap to cut a large number of di erent screw pitches with a single feeding camby providing connections between the cam and the die carrying slide or spindle which. may be adjusted to 'va the speed with which the die carryin sli e or s indie is advanced by the cam. also app y this adjustable feature to the connections between the other cutting tools and their feed cams with equally goo results in respect to feedin'g'each tool at the speed which is best calculated for the eflicient operation of the tool in doing this particular part of the cutting. There is the sameadvantage 1n providm such'an ad'ustment between the cams and t 'e cross sli es or other tool carrying devices which carry the forming tools and operating, for

carrying spindle in I work carrying also provide for such ad'ustment in connection with these, tools. ith' this adjustment each of thesetools-can be fed as is best suited to the work to be done by it. The system of adjustable connectionsbetween the cams and the tools fed'thereby 'is of even greater advantage in enabling the same set of cams to be employed forvarious pieces of work and in enabing the changes to be readily made in changing the machine to roduce different pieces of work. In changing from one piece of work to another the connection between each cam and the tool operated thereby is adjusted to ive the desired speed to that tool and the c ange-gearing which determines the speed of rotation of the cam shafts is adjusted to suit the slowest cut or the one requiring the most time to do its work. Thus any piece of work within the range of the machine can be made with a single set of cams and without requiring the removal and replacing of the cams.

Another feature of the invention which contributes to the rapid operation of the machine and the elimination of lost time in effecting the various operations under the varying conditions incident to, the use of the machine in doing alarge variety of work, is the stopping .of the shafts which carry the feed cams during the indexing and the starting of said shafts immediately the indexing is completed. .This feature is of especial importance in connection with the use of the same set of cams for doing a variety of work since under such conditions these cams must rotate much faster in doing some classes of work than in doin and if the cams are to rotate continuously the part ofthe cams which would pass the cam roll during the indexing would vary widely. This would result in a loss of time or of length of feed. By stopping the feeding cams at the end of their working rotation and then starting the indexing and then again starting the-feed cams at the end of the indexing, the feed cams may be rotated quickly for small pieces of work or slowly for large pieces of work and the whole of their .rotation be employed in feeding the tool carriers and at the same time there will be a minimum loss of time for indexing the spindle carrying heads.

In embodyin the various features referred to above in a simple and efficient construction I have employed various other features'of invention relating more or less to the construction and arrangement of various parts of the machine which, while they are not essential to the broader features of invention, are of importance in contributing to the efliciency and simplicity of the machine.

All the various features of the invention I will be understood from the following detailed description of the-machine in which I have embodied them and will be set forth in the claims. The machine in which I have embodied the various features of my invention in the forms in which I prefer to employ them is shown in the accompanying drawings.

Inthese drawings-Figure 1 is a front side elevation of the machine, certain parts others,

being omitted for the sake of clearness. Fig. 2 is a rear side elevation.- Fig. 3 is an end elevation looking toward the right in Fig. 1. Fig. 4 is an end elevation looking toward the left in Fig. 1. Fi 55 Fig. 2. Fig. 6-is a section on line 6-43 Fig. 1. Fig. 7 is a section on line 7--7 Fig. 1. Fig. 7% is a detail of parts shown in Fig. 7. Fig. 8 is a sectionon line 8-8 Fig.

1. Fig. 9 1s a sect-ion on line 9-9. Fig. "3.

Fig. 10 .is a vertical longitudinal. section through the center of the machine. Fig. 11 is an'end elevation of the tool carrying head. Fig. 12 is a detail side elevation showing the "arrangement of the feed stop. Fig. 13 is a side elevation showing the devices for introducing new rods of stock into the work carrying spindles. Fig. 14: is an end elevation looking toward the right in Fig. 13; and Fig. 15 is a detail of parts shown'in Fig. 13.

The machine shown in the drawings is constructed to operate simultaneously upon five rods of stock and there is accordingly a series of five work carrying spindles A mounted in the spindle carrying head A. The work carrying spindles A are provided with the usual chuck jaws which are opened to release the rod of stock and are closed to grasp the rod of stock by the movement of a chuck sleeve A connected to operate the chuck jaws in any well known manner. The spindles are also. provided with feeding tubes A which may be of usual and well known construction and which are advanced at the time the chuck jaws are opened to advance the stock and are retracted after the chuck jaws have closed preparator to the succeeding feeding movement. kince the specific construction of the connections between the clutch sleeve A and the chuck jaws and also the specific construction of the feeding tube is not material to the present invention, and since constructions of this sort are common and Wellknown, the details of these constructions have not been illustrated.

The spindle carrying head A is mounted in front and rear bearings A A and is indexed at proper intervals to bring the work carrying spindles successively into position to present the rods of stock to the various tools for operating thereon. The mechanism for indexing the spindle carrying head is bestshown in Figs. 8 and 1Q. As shown in these views the spindle carrying head A g. 5 is a section on line is provided with aseries of projecting teeth or lugs A corresponding in number to the number of spindles carried by the head. 'Cooperating with theselugs A is an index pawl A pivoted upon a segmental slide A which is mounted in a guideway A formed in the upper front face of the rear bearing A The pawl is forced yieldingly toward the spindle. carrying head A by a spring A. The pawl carrying slide A is recipto the indexing mechanism.

- co'cfperates with a series of v lugs A secured to the spindle carrying I A. on the other hand proper intervals to disengage and then reengage the locking arm carries the index pawl A arm into in a yoke at the lower rocated at proper intervals to efi"ect the indexing by means of a crank pin A connected to the slide A by a connecting rod A. The cra-nkpin is mounted upon a disk A carried by a shaft A which is given a single revolution at suitable intervals. When the shaft A is rotated through a single revolution, the first half revolution from the position indicated in Fig. .8 into position to engage the next succeeding lug A. During the last half of the revolution of the shaft A the index pawl acts to advance the spindle carrying head through one-fifth of a revolution, the index head being started slowly, rotated rapidlygthrough the middle portion of its moven'ient, and then gradually slowed down as the pawl reaches the end of its .forward movement. The spindle carrying head may thereforebe indexed in a short space of time without shock or jar At the end ofthe indexing movement the spindle carrying head should be accurately. positioned and locked in position until theinext indexing-movementis to take place. The spindle carrying head is thus positioned and ocked by means of a locking arm A which locking steps or head (Figs. 7 and .10). The lockingarm A is provided at its upperend with a recess for embracing the lugs A and the rear side of this recess is extended beyond the front'side at A" to form a stop which cooperates with the stops A on the spindle carrying head :to prevent any over-rotation of" the spindle carrying head at the end of its indexing movement. The locking arm Amis mounted upon a shaft A and has its lower end connected with an -arm A b means of a lug A which projects laterally fromthe arm A into posltion between an adjusting screw' A and a spring pressed pin A which are carried by the arm A" and en age opposite sides of the lug A. The atfjusting screw A forms a rigid connection. between the arm A and. the locking arm is moved positively withthe arm ina direction to disen age the locking arm from the lugs A The spring pressed pinforms a yielding connection between the locking arm and theoperating arm A for, ll'lOVlIlg' the locking position to engage with the lugs A The operating arm A is operatedat A withthe lugs A by means of a cam A secured to the 'intermittent shaft A and arranged to' engage cam rolls A A which are mounted end ofthe arm A swings the locking succeeding stop lug A plece A forming A so that the lockin arm -ro A? connected. at its and lie on diametrically opposite. sides of the cam A. When the shaft A is rotated l to effect the'indexing the high part A" of thecam A strikes the roll At just previous to the beginning of the indexin movement of the spindle carrying head an arm A. upward so that the stop A is out of the path of the lugs A. After the indexing movement has carried the lug A past the stop A the cam roll A rides on to the lower part A of the cam A thus advancing the stop A" on the locking arm into the path of the Asthe indexing is completed the lug A brings up,against the stop A", thus preventing further movement of the spindle carrying head and just previous to this the high part A of the cam A engages the cam roll A and forces the locking arm A forward, the connection between the armvA and the locking arm yielding to allow that part of the locking arm in front of the locking recess to ride on the top of the lug A until the lug-registers, with the recess in when the locking position indicated spindle carrying It is desirable head be as solid arm is advanced into the in Fig. 7' and locks the head in position.

that the spindle carrying as possible when the tools are cutting, and provision is therefore made for positively clamping the head in its bearmg after each indexing so that it is as solid and rigid as if it were a part of the body of means for thus clamping the machine. The the spindle carrying head is shown in Figs. 1 and 7. As shown in these views thecap the upper 'half of the front bearing for the spindle carrying head, is bolted to the lower half'of the bearing the rear side ofthe hearing by a bolt A.

During the operation of the cutting tools the,

front side of the bearin cap is drawn firmly down so that thespini lle-carrying head is firmly and rigidly clamped in the front hearing. During the indexing the pressure upon the front side of the bearing 'cap is relieved so that the cap may spring upward sufliciently to release the spindle carryin head, the cap being again forced downwar at the end of the mechanism which I employ for thus operatin upon the bearing cap A consists of 8. upper end to the front side of the bearing cap and connected at its lower end to a lever A which is mounted upon a pivot A". A second lever A" is the locking arm,

indexing operation. The i mounted upon the pivot A and is connected with the lever A by means of a spring A.

This spring is mounted in a recess in the forced downward with a pressure do ending upon the tension of the spring such times as this' spring is under tension.

The lever A? is operated to apply and re-,

lieve the pressure upon the clamping lever A by a cam'A secured to the shaft A and provided with a notch A within which the roll A carried by the lever A normally rests. When the roll A is in the recess A the spring A is under tension and'the spindle carrying head is therefore rigidly clamped by the bearing cap A During this time the roll A in connection with the recess A also acts as a yielding lock for holding the shaft A in position. When the shaft A starts, the side of the recess in the cam A acting against the roll A forces the lever A downward untilthe roll passes out of the recess, after which continued movement of the cam allows the arm A to move upward, thus relieving the tension upon the spring A and thepressure upon the bearing cap for the spindle carrying head. As the rotation of the shaft A is completed at the end of the indexing the roll A on the lever A again enters the re- .cess'A locking the shaft A in position and also maintaining the pressure upon the spring A so that the spindle carrying head is again firmly locked in position by the bearing cap A The work carrying spindles A are continuously driven during the operation of the ma-" chine through an annular orring gear A? which surrounds a series of gears A secured to the spindles and is provided with internal gear teeth engaging the gears A The annular gear A is provided with an.

internal bearing surface A corresponding to the pitch surface of the internal gear teeth and the annular gear is supported and carried by bearing hubs A formed onthe gears A which engage the bearing surface The'annular or ring gear is provided with gear teeth upon 1ts outer periphery and is continuously driven through a gear A which engages these gear teeth and is secured to ashaft A arranged back ofand parallel to the spindle carrying head (Figs. .2 and 9). .The shaft A is connected by change gears A with the main driving shaft B of the machine which is continuously driven at a constant speed bya belt passing; over a pulley B. By changing the gears A the spindle'speed may be varied to suit;

the particular work to be done and the full belt power be utilized under all conditions.

As has already been stated the chuck 'aws of the .spindles are opened and close by reciprocating the chuck sleeves A and the feed of the rods of stock is effected by reciprocating the feed tube A. In order to eliminate the loss of time incident to the usual lIlQthOdOf' opening and closing the chuck jaws and feeding the rod of stock, I have provided mechanism for performing these operations during the indexing of the spindle carrying head. While it is not essential to this feature of my invention that the movement of the spindle carrying head be utilized in effecting the opening and closing of the jaws of the chuck and the feed of the rod of stock, yet I prefer to embody this feature of my invention in a construction which thus utilizes the movement of the spindle carrying head on account of the simplicity of the construction which may be used and the efficient and accurate action of 'such construction. A simple and eflicient form of mechanism for thus utilizing the indexing movement of the spindle carrying head is that which I have embodied in the machine which is being described. This mechanism is clearly. shown in Figs. 1,, 3 and 10. As shown in these figures each chuck sleeve A is provided with an annular groove a which is engaged b the ,arms of a yoke af projecting laterally rom the chuck slide a The'chuck slides a are mounted upon guideways a formed upon a frame a which is secured to the rear end of the spindle carrying head A. The feed tube is also provided with an annular groovea 'which is engaged by the arms of a yoke a project ing laterally from a feed slide a which is mounted to slide upon the guideway (L The chuck is opened and closed by a stationary cam (6 arranged tov act upon the roll a carried by the chuck slide as the spindle carrying head is indexed. The feed tube slide is advanced to feed the stock during the time that the chuck jaws are open, by a stationary cam a arranged to act upon the cam roll a secured to the feed slide and the feed slide is retracted preparatory to the next feeding movement by a second stationary cam a arranged to actupon the roll a of the feed slide.

The cams for opening and. closing the chuck andfor feeding the stock vare mounted upon a supporting hood a which partially surrounds the frame a, upon which the chuck and feed slides are mounted and this supporting hood is soconnected with the frame of the machine that it may be readily moved to carry the operating cams out of.

the path of the cam rolls on the feed and or opening and closing the chuck jaws as hood .shown in Fig. 3 the chuck the upper spindle.

. in the hood a machine for different pieces of work. T131011 1s also made for ,quently will not withdraw the feeding tubes for instance in settingup or adjustingPthe rochanging the position of the hood to change the timing of the feed of the stock with relation to the cutting tools as is frequently desirable in setting up the machine for different pieces of work. In order that the supporting hood a may be thus moved or adjusted it is pivoted atone en'd upon a rod a -which passes through the retainlng plate a for the spindle carrying head A and forms one of the bolts for securing said plate to the frame. The other end of the supporting hood is arranged to rest upon a second rod (1!, which also extends throiwh the retaining plate a and forms one of the bolts for securing said plate in position. The hood is locked in posltion by means of a retaining lover a" which is pivoted to the hood and has alower hooked endarranged to pass beneath the bolt a and rigidly bind the supportin r hood in position. The lover a is provide( with a han-' dle a. by which the hooked end of the lever may be swung from beneath the bolt a so that the hood may 'be swung up out of position whenever desired.

With the arrangement of the supporting operating and feeding cams are supported in position to effect the feedin of the stock as the Work carrying spindFe moves from the position at the left of Fi 3 to the position of I it is desired to effect the feeding of the stock between any other two successive positions of the spindle, the position of the supporting hood may be changed by removing the rods a and a and introducing them into the holes occupied by the proper bolts 64" for the retaining plate a, the retaining bolts a which are removed to enable this adjustment-bein introduced into the holes from which the r0 s a and a" have been removed.

In order that the lengths of stock feed may be varied asv desired, the cam o for retracting the feeding tube is adjustably mounted to vary the extent to which the feeding tube is withdrawn during the indexingmovement subsequent to the indexing movement during which the feed of the r0 takes place. As shown in Fig. 10 the cam a is secured upon a slide a guided in a slot by a clampin nut a. The slide a is owed forwar by a spring a and its forward position is regulated by an adjustlng screw a. If it is desired to operate the machine without feeding the stock as insetting up, the cam a" may be moved forwardto such a position that it will not act upon the cam rolls of the feeding slides and conseas the spindle carrying head is indexe The same result may be effected 1f deslred by time after one set of ing of heads C and held in adjusted position is rotated and the stock advanced by the feeding mechanism. The feeding stop a consists of a rod screw threaded in one of a series of holes a formed in the fixed head for the tool slides or spindles, the position of the stop dependin upon the position of the hood carrying the feeding and chuck operating cams.

In using multiple spindle machines it is customary toemploy rods of stock all'of whlch are of-the same length-and it is deslrable that new rods of stock may be introduced into the machine in the least possible rods has been used up. In order to facilitate the introduction of new rods of stock I have stock carrying pipes G which are connected to rotate with the spindle carrying head and are so mounted that-the ends of the pipes adjacent to the spindles may be moved ra iall thus allowing the introduction of the ro s of stock at the front ends of the pipes. (Figs. 13-15.) These stock carrying pipes O are mounted in a rack consist- C which are secured to a central shaft C the head 0' being provided with open recesses for receivingthe stock ipes, while the head C is provided with c os'ed recesses for retainin the rear ends of the pipes in the head. The pipes are retained ieldingly within the recesses in the head Cl b means of leaf springs C which are secure to a collar C on the shaft C and are connected at their forward ends with the pipes C. By reason of this yielding connection between the i es and supporting rack, the front ends 0? the pi )es may e moved radially outward so that t e rods of stock may be introduced into the front ends of the pipes after which the pipes are returned to position by the springs C. The centralshaft C of the stock rack is secured to the rear end of the frame a which forms a continuation of the spindle head by a in and slot connection C as indicated in *ig. 10 so that the stock supporting rack rotates with the spindle head. The rear end of the rack is sup orted upon rolls 0 upon which the head Cl rests as indicated in Figs. 13

I and 14.

In order that the rods of stock introduced into the'stock ipes may be conveniently advanced througll the spindles into pro er position to be acted upon'by the cuttin ofi' tools, the stock carrying rack is provided with. a device for enga ing the rear ends of the rods of stock an this device is connected with operating devices .whereliy hit may be operated from the front end 0 provided a series of moved forward stock supporting rack which is Within convenient reach of the operator. This stock advancing device consists in the construction shown, of a disk C secured to the outer end of a rod C which extends forward through the shaft 0 which is made hollow to recelve it. At its front end the rod C is connected with a sleeve C by means of a pin C which extends through the sleeve and rod and plays in slots formed in the hollow shaft C The sleeve (1 ismounted spindle whose chuck is open radially out-' ward and introduces a'rod of stock into the tube,'th'e' end of the rod of stock striking the disk C and forcin it to the left until 1ts movement is arreste as the introduction of the rod of stock is completed. The pipe C is then returned to normal position bringing the front end of the rod of stock into line with the bore of the feeding tube in the correspondin spindle. The slide 0 is y the operator, thus advancingthe stock engaging disk C which drives the rod forward into the spindle of the machine through the feed'tube and the chuck just far enough so thatthe cutting off tool will finish the-end of the rod of stock. The machine is then turned through a cycle and then another bar. of stock inserted in the same manner. After the rods of stock have been thus introduced, the next feed of the stock will result in the Productionof perfect pieces of vwork.

By the indexing movements of the spindle carrying head each spindle is presented in succession to tools mounted in carriers arranged to move radially of the Work held by the spindles. As indicated in Fig. 6 the machine being described is provided with 4 cross tools and these tools are mounted in 4 carriers D D D D, the carriers D D being pivoted carriers, while the carriers D D are in the form of cross slides arav ranged in suitable ways in the bed of the machine. Each of the cross tools acts upon the work carried b each of the spindles and if one of the spin les should be so mounted that it is nearer the axis of the spindle headthan one or the other of the spindles and the cross tool should be advanced to exactly the same position when operating upon the work carried by each of the two spindles, then the 'work carried by the spindle which is nearer to the axis of ,,the spindle head would be finished to a larger diameter by the cross tool than would the work carried by the other spindle.- The two pieces of work formed from theadiflerent rods of stock carequal wear upon the parts,

sponding to each cross tool carrier.

ried by the two spindles would not therefore be exact duplicates of each other. In other vdue to unavoidable inaccuracies in constructing the machine, or due to inaccuracies which maybe. developed b' reason of un- T have provided a rectifying stop for each spindle conif- T e rectifying stops for cooperating with the cross tool carrier D consist of a series of pins cl projecting radially from the disk D which is secured in the front end of the spindle head; There is a pin (1 corresponding to each of the spindles and these pins are so arranged that they are engaged by a cooperating stop d on the tool carrier D. In building the machine these pins a are words, slight inaccuracies in the mounting adjusted or ground off so that the cutting edge ofthe tool carried by the carrier D will be exactly the same distance from the .center of each spindle when the stop at is pressed against the corresponding pin d.

For instance if the forming tool on the carrier D is adjusted so that it will turn the work carrier by one of the spindles about ,4; of an inch in diameter when the stop (1 is in engagement with the corresponding pin d and it is found that the tool forms the work carried by the succeeding spindle corresponding pin cl for the succeeding spindle, then this pin 03 is adjusted or ground so that the tool will form the work on this spindle to exactly it of an inch in diameter when the stop (I? is in engagement with the pin. Thus each of the pins is ground or adjusted so that the stock carried by each of the spindlesis turned to exactly 5; of an inch by the action of the tool carried by the tool carrier D. The stop pins dare then left permanently in this adjustment unless Wear upon the machine develops some inaccuracy in which case the pins are readjusted or reground to rectify such inaccu:

racy. The rectifying stops for the tool carrier D consist of pins d and are arranged to cooperate with a stop d on the tool carrier. The rectifying stops for the carriers D and D consist of pinsd (2* respectively arranged to cooperate with stops (Z d on the tool carriers D D respectively.

The stops carried by the tool carriers consist of adjustable screw rods which may be adjusted. according to the position which the forming tools should occupy when in ad-' D. The link 1) is pivoted-at front and back of the machine andare driven in unison by mechanism which will be hereinafter described. The cams D D D and D are all of the same form and the devices for connecting the cams with the respective tool carriers are substantial duplicates in I construction and mode of operation. A description of the construction and mode of operation of the devices for operating the cross slide D w1ll therefore be sutlicient for an understanding of this mechanism.

As shown in Fig. 6 the connections between the cam D and the cross slide I) comprise a lever D which is pivoted at D and' connected with the cross slide D? by a link one end to the cross slide D and at the other end is pivoted to a block I) securedto the lever D The blockfD is connected with the lever D3 by means of a bolt D and nut The bolt passes through the block D and the head of the bolt lies within a T- shaped slot which extends longitudinally of so that the radial of the. lever may be varied by sliding the block along the upper arm of the lever and then clamping the block in adjusted position by tightening the nut D By means of this adjustable connection between the'lever D and the link D the speed of the movement imparted to the cross slide D and the distance through which it is moved by the cam D may be varied according to the character of the work tool carried by the cross slide. The link D is adjustable in length, being formed of two oppositely screw-threaded rods connected by a turn buckle so that by turning the turn buckle the length of the link may be increased or diminished to bring the tool carried by the cross slide into proper relation with the axis of the work carrying spindle when the tool slide is in its advanced position. The connections between the cam D and the cross slide are adjusted so that the stop d is pressed firmly against the rectifying stops d when the cross slide is in its advanced position and the spring in'the connections is suflicient to compensate for any slightvariation which there may be in the advance position of the slide when the stop 03 is in engagement with the different rectifying stops.

By reason of the adjustable connections between the cam D and the cross slide D the same cam may be used for operating different tools and the feed of the tool be regulated according to the requirements of the work being done, with the result that a change from one piece of work to another within the capacity of the machine does not require the removal of the cam D and the replacing of it with another camsuitable for the eflicient action of the particular tool to tools carried by a being done by the be used and the particular work to be done, as is necessary with the usual construction of screw machines.

The rods of stock carried by the spindles are also presente successively by the spindles in position to be acted upon by cutting series of "tool slides or spindles arranged in axial alinement with the work carrying spindles and arranged to'move longitudinally of the work. These tool carrying spindles or slides as shown consist of 4 spindles E which do not rotate and a tap or die carrying spindle E which is mounted to rotate in a manner to be described, the number of tool carrying spindles thus corresponding in number to the number of work carrying spindles in the spindle carrying head. The tool carrying spindles are mounted in a head E which 'is rigidly held in bearings E E in alinement with the bearings for the spindle carrying head A. The tool carryin spindles are provided at their forward en s with the usual clamping devices E for retaining the tools in the forward ends'of the s indles. The nonrotary s indles E are held from rotation by means 0? keys E which en age slots formed in the spindles. The spindles are operated by means of a series of cams ET-secured to a cam shaft E? which is geared to and rotates in unison with the cam shafts D D for the cross tool carriers. The connections between the tool carrying spindles and the operating cams E are the same in construction and mode of operation as the connections between the cross tool; carriers and their operating cams. These connections consist of levers E arranged to engage the cams and provided with slots in their up er arms in which are mounted adjusta le blocks E connected by means of adjustable links E with the rear ends of the tool spindles. The tool spindles are forced rearwardly so as to maintain the cam rolls on the levers in engagement with their cams by means of springs E mounted within the spindles. These springs are inter osed between a plug E at the rear en of the spindle and a plug E mounted within the spindle and arranged to engage a pin E which extends throu h slots formed in the spindle and is carried by a collar E. Fig. 10.) The collar E is loosely mounted on the spindle and is forced against the disk E which forms the front end of the tool spindle head by the s ring E. In the case of the'non-rotary too l spindles E the links E are pivoted directly to cars formed on the rear end of the'spindle- In the case of the rotary s indle E oted to a cy indrical piece E held within the rear end of the spindle by a collar E having'an inward projecting flange which engages the rear end of the iece E and retains it within the end o the spindle.

the link E is piv- While I have shown but one rot y pi dle dles may be advanced at the speed and through the distance and smoothly cut and the die requisite for the proper operation of the articular tool carried thereby and the spindles or slides may be operated by the same set of cams in doing the various pieces of work within the capacity of the machine. .In the case of the die carrying spindle or' spindles the adjustable connections between the spindle and spindle advancing cam enables the feed of the spindle to be adjusted according to the pitch of the screw being cut andthe same cam may be employed for cutting the various threads required in doing, different pieces of work. I

In cutting threads the'spindle'E is rotated in the same direction as the work carrying spindle both .duringthe threadin operation and during the running off 0 the die or tap, the speed of rotation being retarded during .one operation and accelerated during the other. With this mode of operation there is no stopping or reversin of either the spindle or die and no vio ent change of the direction 'ofrotation of any part and thus the threads may be accurately or tap run 0 without undue wear or m ury to thethreading tool and the threading be "performed under the most favorable conditions. The mechanism for thus rotati?- the die carrying spindle E is shown in gs. 2, 5 and 10;. As shown in Fig. 10' there aretwo gears e e of different diameters secured to the spindle E and these gears are engaged by gears e c loosely mounted on a shaft e. The shaft e extends longitudinallythrough the axis of the spindle carryin head A and throu h the tool spindle head E and is connected hy with the spindle gears A The thus continuously driven through a gear e shaft 8* 1s the annular gear A and the spindle gears;

' Either one or the other. of the gears e e may be connectedwith the shaft 0* by-means of the clutch e keyedto rotate with the shaft 6 and provided'with clutch facesarjranged to engage corresponding clutch facesv on the gears 6 6 When-the clutch e is in engagement with the gear 6 the diecarrying spindle will be rotated in the same-direction as'the work carrying spindles but at a slower speed and when the clutch. is in en*. gagement with the gear 6 the die carrying spindle will be rotated n the same directipn as the work carrying spindle but at a faster Speed. In cutting right handed threads the die spindle E is rotated in the same direction as the work carrying spindle and at a slower speed "during the threading: and is work carrying spindle but at a slower-speed.

cams for the cross 'a pin (3 arranged to engage 6 passes the point of the V,

clutch from the gear (2 and reengag- 115 rotated in the same direction and at a higher speed during the unthreading In on left handed threads the relative spee s" would be the reverse, that is to say during the threading operation the die carrying spindle wouldrotate in the same direction as the work carrying spindle and at a-higher speed and during the unthreadin'g operation would rotate in the same direction as the The clutch e is shifted at the proper intervals to throw the gears e and a into and out of operation through the movement of a yoke I e which is secured to a rock shaft 6 and is provided with pins'e engaging an-annu'lar groove 6 in the clutch. The rock: shaft 6 is operated by cams e secured to a cam drum carried by the cam shaftlD on which the tools are mounted. The connections between the cams e and the rock shaft e" consist of a lever e pivoted upon a rock shaft and provided at its lower end with a cam roll which is acted uponby the cams e The lever e is provided with one side or the other of.a V-shaped plate e The plate o is formed on the lower end of a rod 6 which is mounted in an arm (2 secured tothe rock shaft e'the rod being forced downward by a spring a, By this construction when the lever e is moved toward the right in Fig. 2 for: instance the in 6 acts against the side of the V-shaped p ate e forcin pin 0 upward against the tension 0 spring 0 until the in ofv he V. During t is time the clutch willremain in engagement with the ear 6 As soonas the pm 6 passes the point of the V the downward pressure of the'spring'will force the V-shaped plate 6 downward and the right side of the V acting against the pin 6 w ll cause the arm e to be suddenly shiftedtowa-rd the left, thus disengaging the clutch from the gear 6 and engaging it with the gear a When the lever e is shifted in the op osite direction the same, action will take p ace exceptthat the arm 6 W111 suddenly shifted toward the right as the pm I thus disengaging the ing it with the gear 6?, the parts being then in the position shown in Flg. 2.

In order to avoid the loss of time which would result from continuousl rotatin the cam shafts for efiecting cutting tools, I have provided mechamsm for stop ing the rotation of the cam shafts at the Beginning of the indexing of the spindle head and then starting the cam shafts again at the end of the indexing. 125' The form of mechanism which I prefer to employ for this purposeis shown in Figs.

1. 2, 4; 5 and 10. The

I cam shafts D D? which carry the came for the cross tool carI-.

riers and the cam Shaft E which carries the-1 80 they 6 passes the point 100 the ceding of the scribed, the speed of on a gear F clutch member F I as " gear F the tension of the spring U cams for o dles or sli erating the tool carryin spines, are connected toget er by bevel gears F'so thatthe shafts rotate in unison and these shafts are driven through worms F secured to a worm shaft F and engaging worm wheels F to the cam shafts D D.

F is driven through a gears F from a sha F tends transversely of the alinement with a shaftF which are secured The worm shaft system of change The shaft F exmachine and is in wh1ch is connected by bevel gears F with the index shaft A; During the operation of the cuttmg tools the shaft F is the cam shafts throu varied to suit the being done by The mechanism continuously rotated and drives b4 the glfarin e cam s requirements of the work means of the change ears F. for driving the s aft F deing afts consists of a clutch member F secured to the shaft and engaged by a clutch member shaft F gear F is en by a pinion secured rotating shaft F The gear F with a second clutch member F engage a clutch member shaft F when'the gear F it from the clutch F enga e gear F is shifted clutch F which is loosely mounted on the and is held in engagement with the .by a spring F". The aged and continuously driven to a contmuously is provided arranged to secured to the is shifted to dis- The clutch to disengage it from the and thus stop the rotation of the cam shafts and to engage it with the clutch member F and thus throw the indexing mechanism into operation by a mechanism which is controlled from one of the tool slides. ing mechanism forthe operation and throwing anism for the indexin eration, are shown in ing the operation of the clutch member F the (:peration of the a trip 7 carried The devices for throwing the driv cam shafts out' of the drivin .mechmechanism mto opig's. 5 and 10'. Durthe cutting tools the din engagement with by the sprln F As cutting too s is' comby one of the tool spindles E operates a latch f and releases a s ring ressed lever ri es ,at its lowerend lever is-released the The lever, '7 cara pin 7" and when the spring f rocks said lever on its pivot c'arrylngthe in f into an annular groove 7 which is periphery of the clutch memberFF.

clutchm'ember F i which projects across ormed in the The is provided with a cam the annular groove f and extends to the rear side of the clutch member; When the pin 7 enters the groove 7' it'is brought into the path of the cam f and when this cam init acts against the in f tovfard theleft ing the clutch gear from its rotation rides toforce the clutch in Fig. 5, against F thus disengagthe clutch member spin 1e E'and pm 7". When trip f will ride latch is una 7 ing the clutch G gagement with theclutch member F The shaft F and the index shaft F now continue to rotate until they have made a single revolution. As they complete this revolution a projecting finger f on the clutch member F acts against a finger f onthe lever f forcing the lever back and ca 'ing the pm f out of engagement with the rear side of the clutch member'F" clutch member and gear F are returned by the spring F into engagement with the clutch member F9 thus stopping the rotation of the index shaft and starting up the cam shafts. When the lever ff is thus swung back against the tension 0 its sprin by the fingers f f itsvupper end is engage by the latchf and the lever is retained in thispo sition until it is again released by the action of the trip f on the succeeding return move ment of the toolslide or s lndle E. The trip is pivoted to a block. secured to the normally rests against a stop the tool slide is advanced the over the end of the latch g, ng on its 'ivot so that t e ected. On t e return movementof the tool spindle however, the pin prevents the "swin g movement of the trip the tr p swin 1n the opposite direction so that it will act against the latch f and release the arm f;

The shaft F through which the cam shafts and the indexing mechanism" are driven, is continuously rotated from a shaft G arran ed at the back of the machine and oonnecte with the shaft G. The shaft G is driven from the main driving shaft B engages a gear G 4 and disconnected with the shaft G at the will of the operator throu h 'a clutch G. The clutch G is normally eldx'inengagement with the gear G so ,that. the parts driven-from'the shaft G areo rated from the drivin shaft by means of spring G inter os'ed tween the clutch G and a collar on the shaft G. The clutch G may be disengaged to throw the shaft G out of action of a rod G engagin' the clutch and arranged to be 0 rate u on by a cam G" which is secur to a roc in transversely of the machine viged at its front end with an. y tin handle G When the operating handle G is thrown into the position indicated in Fig.

2 the bam Gwill act upon the rodG forcso that the F by bevel gears atthe will of the operator by means shaft G" extendeproout of engagement with