US1287731A - Automatic grinding-machine. - Google Patents

Description

F. MULLER.

AUTDMATIC GHINDING MACHINE..

APPLICATION FILED MAY 2| i917.

Q9 ..N @l w -maw [Il -I I--- l Q mw mw 1 Q 3K Patented Deo. 17, 1918.

SHEETS-SHEET 2- er )j A 0mm/s F. MULLER. AUTOMATIC GRINDING MACHINE.

APPLICATION FILED MAY 2. ISI? F. MULLER. AUTOMATIC GRINDING MACHINE.

K A APPLICATION FILED MAY 2| 1917. 1,287,731. Patented Dec. 17, 1918,

(f SHEETS-SHEET 3- F. MULLER. AuoMATlc GRINDING MACHINE. APPLICATION FILED MAY2, 19H.

Patented Dec. 17, 1918.

7 SHEETS-SHEET 4- BY ma s. lin

F. MULLER. AUTOMATIC GRANDING MACHINE.

APPLICATION FILED MAY 2.51917- 1,287,731.

F. MULLER.' AUTOMATIC-GRINDINGMACHINE.-

APPLICATION FILYED MAYZZ, I9l7.'.

\ kI atented Dc. 17g 1918.

TIIIII. 1|.I

l A l 1 rl A MIT vuse with or as a one time.

uniriin sriiriis riifranfr orrion.

FBIEDERICH 'MLLEB, OF HARTFORD, CONNECTICUT, ASSIGNOR TO PRATT & WHITNEY COMPANY, 0F NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

AUTOMATIC GRINDING-MACHINE.

Specication of Letters Patent.

Patented Dec. 17, 1918.

Application filed May 2, 1917. Serial No. 165,908.

To all whom 'it may concer/n:

B'e it known that I, FRIEDERICH MLLER, a citizen of the United States, residing at Hartford, in the county of HartfordA and State of Connecticuthave invented certain new and useful Improvements in Automatic Grinding-Machines, of which the following is a specification. d

The invention is particularly adapted for part of a grinding machine of the type disclosed in n'iy reissued Patent No. 13,930, dated June 15th, 1915. A machine of this type is provided with abroadfaced wheel which has a width at least as great as the.`l'ength of the' articles being ground, thus enabling the machine to effect grinding from end to end of the article at Such a machine is adapted for grinding twist drills, reamers, mandrels, cylindrical or tapered articles. In this speci cation, 'for the sake of convenience, I will refer to the grinding.

of tools, but it will be understood that the term is used in a broad generic sense and is intended not only to includev drills, reamers,etc., but also mandrels, tapered pins and other articles adapted to be ground.

Asdisclosed in the said"reissue d Patent No. 13,930 the grinding machine was co'nstructed to stop automatically after the completion of one grinding "operation, and it` `was then necessary for the 'operator' to manually remove the tool or other article that had been ground and put a new one in place on the centers. After that it was necessary for the operator to start the operation of the machine. In accordance with the present invention the .entire operation is completely automatic, means being provided whereby the tools or other articles to be ground are automatically supplied and removed without interrupting the operation of the machine. It is lonly necessary for the operator to supply blanks from timeto timeto a magazine which is provided.

The principal object, therefore, of the provide a grinding machine having automatic means for supplying and removing the tools or other articles to be ground. Other objects of the invention will be apparent from the following speeiication and claims ins and many other y tional tional view In the accompanyin drawings I have shown a grindin mac ine embodying my invention, thisbeing in many respects similar to that shown in my. aforesaid reissued Patent No..13,930. It'will be understood that the drawings are intended to be merely illustrative of t e invention and are not to be construed as defining or limiting its scope. Many changesin details and in general arrangements of parts can be-made without departing from the scope of the invention as set forth in the accompanying claims.

Of the drawings:

Figure 1 is a front elevation, the several parts being shown inthe positions which' they occupy when a supplied for grinding.

Fig. 2 is a side elevation taken from the right.

Fig. 3 is a plan view, the belt tighteners and other parts being omitted.

FigJi is a transverse view taken alon the line Fig. 5 is a slide. l

Fig. is a fragmentary longitudinal sectional view taken along the line 6-6 of Fig. 5 and showing the wheel feed slide and other parts immediately associated therewith. n

v Fig. 7 is a horizontal sectional view taken along the line 7-7 ofFig. 2. Fig. 8 is a-.view showing adevelopment fresh blank is being fir-4 of Fig. i.

"of one of the cams.

Fig. 9 is a fragmentary, vertical sectional yiew `showing the changespeed drive gearing. Y

Fig.

view showing the change-speed gearing and associated parts, this view.being ta en along the line 10--10 of Fig. 9.

Fig. 11 is a fragmentary horizontal secon an enlarged scale showing the grinding Wheel and parts of the tool supporting mechanism'. In this view the Wheel 4is shown inl operative engagement with the work, and the magazine mechanism and other parts are omitted for the sakeA of clearness.

12 'is a. front-elevation with pari-.spin

vertical sectional,

p an view ofthe wheel feed 1() is a fragmentary vertical secsection, showing the same mechanism which.

is shownin Fig. 11.

Fig. 13 is a plan viev.1 showing the table l operative relationship l l the magazine mechanism.

Fig. 15 is a view similar to F ig. 14 but showing the,elements of the mechanism in another position. l

Fig. 16 is a viewvshowing a development of one of the vcam Referring to the drawings, 1 represents the main frame or base of the machine, this being adapted to. rest upon and be securedv to the floor. The grinding wheel is indicated at 2, this wheel preferably being pro vided with a relatively broad face and being formed-in several sections as indicated. TheA wheel is carried by the base 1, being mounted upon a horizontal shaft 3 which is rotatable in bearings 4, 4.I

Suitable devices are providedfor holding and rotating a tool to be ground, in cowith the wheel. These devices will be described in detail hereinafter, and for the present it is sufl'icient to state that they comprise centers 5 and 6 adapted toengage the respective ends of the tools.

The grinding wheel may be driven in any of several ways, but, as illustrated, the wheel is driven by means 4of a belt 7, passing over a belt wheel 8 connected with the grinding wheel and over a belt wheel 9 mounted on a rotatable shaft 10. A suitable tightener 7a coperates with the belt 7. Carried by the main frame in suitable bearings is a drive shaft 11 provided with a driving means such as a belt Wheel 12. The shaft 10 is driven from the main shaft 11 by means of a belt 13 which passes over a belt wheel 14 on the shaft 10 and a belt wheel 15 onthe shaft 11. A spring controlled tightener pulley 16 is provided for the belt 13.

The wheel 2 with its shaft and the bearings, is mounted upon the main base 1 through intermediate parts which permit the wheelto be moved horizontally in several ways fr the purpose of adjustment and for the purpose of feeding. shown most clearly in Figs. 2 and 4, the bearings 4, 4 are secured to or formed on a slide 17l which is adjustable in the direction of the wheel axis on suitable guides formed on a Aplate 18. This slide 17 also carries the bearlngs for the shaft 10. By moving the slide 17 with respect to the plate 18 the wheel can be preliminarily moved longitudinally into an operative position which is suitable for the work to be done. By means of screws 19 and a gib 20 the slide 17 can be locked in adjusted positioni Secured to the slide 17 is a suitable cover or casing 21 partly inclosing the wheel.

The plate 18 constitutes a slide adjustable at right angles' to the axis of the when Y along sultable ways formed on a carriage 22. A rotatable rod this means the wheel canbe adjusted toward or away from the work vto vary or control the diameter of the finished tools.

he carriage 22 is mounted in suitable ways formed on the base 1, these ways being at right angles to the axis of the driving wheel and parallel to the ways along which the slide 18 is adjustable. Also mounted in suitable ways in the base 1 is a feed slide 25 mounted to move along lines parallel to the axls of the grinding wheel and at right angles to the lines of travel of the carriage 22. This slide 25 with associated parts is shown in detail in Figs. 5 and 6. Referring to these figures it will be observed that there is mounted upon the slide a cam plate 26 pivoted at 27 and adjustable about the pivot by means of a bar 28 controllable by a screw 29. Also secured to the slide 25 are two cooperating cam plates 30 and 31. Depending from the carriage 22 is a roller 32 which is adapted to be engaged by the said cam plates 26, 30 and 31.

Positioned immediately beneath the slide 25 is a rotatable cam drum 33 which is mounted on a shaft 34 supported in suitable bearings in the main base frame. This cam drum is (provided with cam plates 35, 36, 37, 38 an 39 which are shown in development in Fig. 8. Depending from the slide 25 is a roller 40 adapted to be engaged by the said treme right-hand position as viewed in Fig.

6, the roller 40 would be in the relative pos1 tion indicated by full lines in Fig. 8. At the same time the roller 32 would occupy the; relative position shown in Figs. 5 and 6, the carriage 22 being at its eXtreme rearward position with the grinding wheel withdrawn from engagement with the work. The movement of the drum causes the cam plate 35 to force the roller 40 and the slide 25 quickly toward the left.- This quick movement of the slide 25 toward the left causes the roller 32 to be forced along the surface of the cam plate 30, thus quickly moving the carriage ler 40 is plate 35 it is engaged with the work. As soon as the ro disengaged b. the cam by the cam p ate 36 which is less sharply inf clined and which serves to move the roller and the slide 25 slowly toward the left. During this slow movement of the slide toward the left the roller 32 is the cam plate 26 which is inclined to a in engagementwith f greater or less extent in accordance, with the adjustment of the bar 28. The inclined 'surface of the plate 26 causes the,y roller4 32 and the carriage 22 to be moved very slowly k forward, thus feeding the grinding wheel to its work. At the end of the cam plate 38 is a plate 39 which is perpendicular to the axis of rotation. While thisplate 39 is assin the roller no movement of the sli e 25 ta es place and therefore no movement of a supplemental carriage 22.

When -the cam the roller 40, the roller are moved quickly toward the right. This movement brings the cam plate 31 into en gagement with the roller 32, thus forcing the carriage 22 and the grinding Wheel quickly backward and out of operative position. After being disengaged by thecam plate 39 the roller 40 is again 'engaged by the cam plate 35 and the operation before which meshes worm 45y which meshes with teeth adapted described is repeated.

Means are provided for driving the cam shaft 34 from the main drive shaft 11. Mounted on the shaft 11 is a spiral gear 42 with a similar spiral gear mounted on a short horizontal shaft 43 positioned 'below the shaft 11 and extending at ,right angles thereto. Mounted in alin'ement with the shaft 43l isa shaft 44 carrying a with a Worm wheel 46 mounted on the cam shaft 34. A collar 47 is splined on the shaft 44 and is provided to mesh with similar teeth on a collar 48 secured to the shaft 43.

It will beseen that when the teeth of the collars 47 and 48 are in engagement, power will be transmitted from the shaft 43 to the shaft 44, the cam shaft 34 with the drum 33 thereon being rotated.

In order that the speed movement of the shaft 34 and the associated parts may be changed, a dierentlyv speeded also provided for rotating rthe shaft 44. Mounted at the right hand end of the main drive shaft 1'1 is a set of ,cone pulleys 49.

Mounted upon a short shaft 50 is a companion set of cone pulleys 51.' A belt 52 connects the two sets of pulleys and is movable from one pair of pulleys to another to change the relative speeds of the two shafts 11 and 50. Mounted ori-the shaft 50 is a spiral gear 53 which meshes with a spiral gear 54 which is rotatable on the shaft 44.

The aforesaid collar 47 is provided with #collar 48, and therefore plates 38 and 39 engage and the slide 25` 'a lever 57 carrying a rol Qmounted at apoint 'd 56 is a bell-crank mechanism 1s,

teeth on its left-hand end which are adapted to engage similar teeth on the gear 54. Vhen the collar 47 is moved'toward the left it is disengaged from `the collar 48 and is connected with the gear 54. The gear has a speed of rotation which is considerably slower than that of the shaft 43 and the when the collar 47 is in its left-hand position the shaft 44 is driven relatively slowly. It will be understood that the speed of the shaft when driven in this Way can'be changed by moving the belt 52. Vhen the collar 47 is in its central position n0 powerY is transmitted and the siift 44 and all parts' driven thereby are 1 e.v

The collar 47 is provided with an annular groove into which project pins carried by an oscillatory lever 55. This lever is mounted at the lower endof a rock shaft 56 and at the upper end of the shaft there is mounted ler 5 8. Pivotally opposite the rock shaft lever 59 in one arm of which there is carried a spring-pressed plunger 60. The forward end of the plunger is V-shaped and is adaptedto engage and coperate with the roller 58 on the lever 57. The other arm of the bell-crank lever 59 is provided with a roller 61.

Mounted upon a shipper wheel 62 and adjustably secured to this wheel 62 are twooppositely shaped shipper dogs 63 and 64 each adapted to engage the roller 6l and thus move the bell-crank vlever 59 first in one direction and then in the other. When the lever 59 is moved in the counter-clockwise direction from the position shown in Figs. 3 and 7, the plunger 60 engages the roller 58, thus, by means of the lever 57, the rock shaft 56 and the lever 55serving to move the collar 47 into engagement with the gear wheel 54 on the shaft 44. When the Alever 57 reaches its limit of movement the plunger 60 is forced inward by the roller 58 and the plunger passes the roller and takes front side thereof. The shaft 44 and the connected parts lare then driven fron'r the gear wheel 54 and continue to be so driven until the next shipper dog engages the roller 61 to move the bell-crank lever in the clockwise direction. Then the plunger 60, acting through the roller 58 and associated parts, serves to move the Vcollar 47 into engagement with the collar 48, the shaft 44 and connected parts being then driven at increased speed through the cone pulleys and other parts that have been described. When the lever 57 reaches its limitv of movement the plunger 60 is again forced inward and moves past the roller 58 taking a position on the rear side thereof, as shown. In this way the shaft 44 is automatically connected the end of the shaft 34 is) `a position on the alternately to be driven relatively slowly plates 75, 75 and 76, 76 carried by the ca from the gear wheel 54 and relatively rapdrum 33. As shown in Fig. 8 the drinn 1s idly from the shaft 43. The shipper dogs provided with a large number of these plates 63 and 64 are so positioned on the wheel 62 so that during each grinding operation the 5 that the more rapid movement begins aplever is oscillated a large number of times. 71 proximately when the roller 40 is engaged At a point opposite to the initial end of the by the cam plate 38, and the less rapid movej cam plate 35, the series of plates 75-76 1s, ment begins when the roller 40 is engaged interrupted and there are provlded two par` by the cam plate 36. In this way the necesallel plates 77 and 78 which holdv the roller 1o sarily slow movements of the machine dur- 74 against movement Whlle the roller 40 '1s 7.5 ing grinding are secured, and then the movebeing moved by the cam plates 38, 39 and ments of the machine are accelerated during 35. In this way the vibratory movement of the time that a finished tool is being rethe tool supporting parts ,is interrupted bemoved and a fresh blank put in place. tween grinding operations, that is while the Preferably, in order that theoperator may finished tool is being removed and while a 80 readily stop the machine when desired, the fresh blank isbeing put in place. When lever 57 has connected with it a link 65 lthe normal grinding operation on the next which extends forward to the front part of tool is commenced the vibratory movement the machine. Pivotally connected with the is resumed.

forward end of the llnk is a handle 66 which Preferably, in order that the machine may 85 is movable at right angles to the axis of the y be used for grinding tapered tools or other link. Associated with the handle 66 is a articles as well as cylindrical ones, the headcam plate 67 having a V-shaped notch therestock 68 and the tailstock 69 are mounted in. During normal operation of the maon the slide 70 indirectly by means of an chine the handle 66 is in its left-hand posiintermediate table 79. This table 79 is pro- 90 tion as shown in Fig. l, and the link and vided with alongitudinal T-slot 80 by means the handle are 'free to move forward and of which the headstock and the tailstock and backward as the lever 57 is oscillated. other parts can be secured in place. The When the operator desires to stop the matable 79 is pivotally connected at 81 to the chine he swings the handle 66 toward the slide 70. By means of screws 82 and 83 95 right, thus forcing it into engagement with the table can be moved about the pivot 81 the beveled edges of the notch in the cam and by means'of screws 84 and 85 it can be plate 67. The handle is finally forced into locked in adjusted position. In this way the bottom of the notch, thus assuming a the line of centers can be adjusted with recentral position and causing the lever 57 to spect to the face of the wheel, thus adapting 100 assume a central position. In this way the the machine for grinding tapered tools or collar 47 is moved to and is. held in a cenother articles tral neutral position out of engagement with In adjusting the machine for the grindthe Shaft 43 and the gear Wheel 54. ThuS ing of tools of a given sort, the headstock `10 the shaft 44 and all parts connected thereand tailstock are positioned on the table 79 105 with are stopped. so as to properly locate the centers 5 and 6 As has already been stated, the tools to with respect to the grinding wheel, the

be ground are supported by centers 5 and 6. grinding wheel itself being moved longitu- These centers are carried respectively by a dinally if necessary. The headstock is lo headstock 68 I'and a tailstock 69 which are clamped in place by means of bolts 86, 86 110 carried by a main supporting slide 70 which which enter the T-slot 80, and the tailstock rests upon longitudinal ways formed on the is clamped in place by means of bolts 87, 87 main frame l. In order to insure smooth which enter the T-slot 80. and even grinding, particularly when the The center 5 ofthe headstock is carried by grinding wheel is formed in sections as a live spindle 88 which is rotatable in bear- 115 shown, I provlde means for effecting a relaings in the headstock. This spindle carries tive longitudinal vibratory movement bea a belt wheel 89 which is engaged by a suittween the tool and the wheel during the able belt, not shown. This belt preferably grinding operation. This vibratory movepasses over a drive pulley which is quite ment is brought about by causing the slide wide, thus permitting the headstock to be 120 70 to reciprocate relatively rapidly on its adjusted longitudinally of the table without ed, carrying with it the headstock and tailinterfering with the operation of the belt. stock and the tool being ground. The re- The drive pulley may conveniently be driven ciprocation is effected by means of al lever 7l from the cone pulleys 90 carried b v the mai n which is pivoted to the main frame at 72. drive shaft 11. 125 At 73 the lever 7l has apivoted connection Carried by the live spindle 88 is a suitwith the slide 70, there being sufficient lost able chuck 91 for engaging the blank and motion at 73 'to allow for the oscillatory turning it. The form ofthe chuck will vary movement of the lever. The lever 71 carwith the form of the blank, and in the drawries at 74 a roller which is engaged by cam ings I have shown a chuck provided with a 130 entering the groove pf the collar.

' moving the collar 93 l mounted on a vertica merger pivoted finger 92 the end of which isbifurcated and is adapted to engage the tang at the end of the shank of a drill. i Means are provided for automatically adjusting ment with the work in synclironism with the Y-movement of the grinding wheel toward and awa from the blank. Splined upon the spindle 88 is a grooved collar 93 which is adapted to engage an inclined surface on an arm formed integrallyr with the finger 92. When the collar 93 is moved .toward right the finger is swung toward the left out of engagement with the work. When the collar is moved toward the left released. Preferably there is provi e spring 94 for moving the finger toward the right into engagement with the work. For moving the co ar 93 there is provide a forked lever 95 pivoted at 96 to stock casting and provided at 97 with pins Pivoted to the headstock casting at 98 is a bell-crank lever 99. One arm of this lever is connected with the forked lever 95 by means of justable link 100. 'A coil spr'ng rounds the link 100 headstock casting, swing the lever 95 101 surand abuts against the normally toward the rig toward the ri 4causing theopening of the chuck.` lidable in a-bearing 102 formed on the headstock casting and in bearings 103 secured to the table 79, is a rod 104. This rod is provided at, its left-hand end with an adjustable collar 105 having a beveled surface adapted to engage a boss 106 on the bell-crank lever 99. Adjustably secured to the rod 104is a collar 107 carrying a pin slot in the upper part of a 'lever 108. collar 105 can be loosened to slide rod 104 when the headstock is moved. he lever 108 is mounted on a short rock shaft 109 which is carried in -a bearing formed in a bracket 110 depending from the table 79. At the inner end of the'shaft 109 is mounte a lever 111 carrying'a roller 112.-

For engaging the roller 112 to move it and lit and lfor doi-ng other work as .will presently be.

described, there is provided a cam drum l shaft-114- This shaft is rotatable in suitable bearings 'in the main the bottom and a cone guide bearing'11 frame, there 6 at The shaft 114 is driven by means of a worm 117 which is secured thereto and which meshes with a` worm wheel 118 on a longitudinal horizontal shaft 119.' The shaft driven from the aforesaid )shaft 44 by means of'bevel gears' 120 and 121 l The drum 113 is provided 122 and 123 adapted to engage and cooperate with the roller`112 on the lever 111. When the grinding wheel begins ,tothe position shown ,in Figs. 1,2, 3 and 4,

he chuck into and out of engagethe j the fin er is the headan ad-` along the' d .isl pivoted at 133 to being a 'journal bearing 115 -atI n work the roller 134`is engaged with cam plates to move rearward.

the roller 112 is engaged by the cam plate 122 and is movedto its uppermost position. rlhe lever 108 and the rod 104 are moved to their extreme left-hand positions, thus releasing the bell-crank 99 and permitting the lever 95 and the collar 93 to be moved toward the right bythe spring 101. The movement of the collar toward the right swings the inward end of the finger 92 toward the left, thus withdrawing it from engagement. with the tool. i The parts are held in the positionslast described until a fresh blank is put in place on. the centers and thegrinding wheel is again moved into its forward position. Simultaneously with the forward movement o-f the grinding wheel the roller 112 is engaged by the cam plate 123 and is forced downward, thus moving the lever 108 and the rod`104 toward the right. The beveled surface of the collar 105 causes the bell-crank 99 to swing counter-clockwise, thus moving the ver 95 andthe collar 93 toward the left. The finger 92 is then released and the spring 94 swings it toward the right into engagement xwith the tang on the shank of the blank.

The center 6 of the tailstock is carried by a spindle 124 which is slidably mounted in a sleeve 125 mounted in the tailstock casting.;

Y Projecting longitudinally from the rear end of the tailstock casting is a bearing or guide bar 126 upon which is slidably mounted a block 127. Projecting from the block 127 is an arm 128 provided through which extends the rear end of the spindle 124. `Positioned in this aperture is a friction block 129 adapted to be pressed. against the spindle 124, a screw 130 being rovided for this purpose. t will be seen that the block 129 serves as a means or frictionally connecting the spindle 124 `with the block 127. Projecting from the block 127 at a point opposite to the arm 128 is a pin 131 which extends througha slot in the upper end of an elbow lever 132. This lever from the table 79. From the pivot point the lever 132 extends toward the left and is provided at its end with a roller 134 positioned inproximity to the cam drum 113. rEhe cam drum' is rovided with cam plates 135 and 136 adapted to engage and cooperate with the roller '134.

with the 4from the I by the carri plate 135 'and is moved `upward. Thisupward' movement of the roller causes the lever 132 to swing clockwise and to move the block 127\together with'the spindle 124 and the center 6 toward theright.Y

Approximately simultaneously` withdrawal' of the grinding wheel is permitted to drop downward, it being remembered thatat substantially the same instant the nger 92 has been moved toward the left to release the a bracket depending 1n this way the v Vnished tool is released and j sition,

, s winging the lever wise direction land gether withthe spindle 124 and the center 6' toward the left. If in the meantimea fresh the roller 141, thus to some extent, thus tend I blankhas been putinposition in alinement with the centers, either manually or by automatic mechanism suchaswill presently be described, the center 6 will engage the said blank and will push it toward the left until the center .5 also engages the blank. The

pressure of the center 6 against the blank 1s limited by the friction which is applied by the block 129.

s shown most clearly vin Fig. 12, the sleeve 125 is provided with upstanding ears 137 to whicA is horizontally pivoted a longitudinal lever 138.I lever .is an adjustable screw 139 adapted to press against a friction block 140 which extends through an aperture in the sleeve 125 and engages the spindle 124. The rear end of the lever 138 is provided with a roller 141 which is adapted to be engaged by a cam surface 142 formed on the upper part of the arm 128.

When the block 127y with the arm 128 is moved forward it acts through the friction block 129 to move the spindle 124 and the center 6 forward into engagement with the blank in the way already described. The several parts `are so constructed and arranged that the extent of movement of the block 127 is considerably greater than that of the spindle 124. When the movement of the spindle is stopped by the engagement of the center with the blank, the block 127 continues to move, thus causing the cam surface I142 to move under the roller 141 and swing the lever 138 in the counter-clockwise direction. The screw 139 presses against the block 140, thus forcing the block into engagement with the spindle 124. In this Way the spindlev is securely locked against any retrogrademovement. When the block 127 is moved toward the rear the rst result is to move the cam surface 142 relatively to releasing the roller and permitting the lever 138 to move and release the friction block 140. As soon as the friction at the block 140 is removed the friction at the block- 129 serves to withdraw the spindle. I

It frequently happensdurin'g grinding that the blank becomes heated and expands ing to cause undue pressure at the centers. To avoid this diiiculty I preferably provide means whereby the tailstock center 6 is permitted to yield against a spring resistance to prevent any excess pressure. As lshown in Fig. 11, the sleeve 125 is movable longitudinally to a limited extent and is rbeen described lfor to the sleeve 125 as `parts carried thereby move with At the forward lend of the normally held in its forward position by means of a coil spring 143. Inasmuch as the sleeve is normally in itsv for- Ward position, the spring 143 does not interfere in any way with the devices which have moving and locking the spindle 124. If after the spindle 124 is locked described, the spindle is forced toward the right by the expansion of the blank, the sleeve 125 and the several the spindle against the resistance of the/`Spring143.

I will now describe the magazine mechanism for automatically supplying unground tools to the holding and rotating means.

he magazine mechanism does not of itself constitute a part of the present invention, being set forth in my divisional application for magazine mechanism, Serial No. 198,057, filed October 23rd, 1917.

Secured to the main casting of the headstock is a bracket 144. This is held by bolts 145 extending'through slotted holes in the bracket. These slotted holes permit limited adjustment ofthe bracket longitudinally of the headstock, and after adjustment the bolts serve to secure the bracket in adjusted position. Secured to the tailstock is a bracket 146. This is heldv 'by bolts 147 extending through slotted holes in the bracket. These slotted holes permit limited adjustment of the bracket longitudinally of the tailstock, and after adjustment the bolts serve to secure the bracket in adjusted position. The two brackets 144 and 146 are provided respectively at 148 and 149 with bearings in alinement with' each other.

Pivotally mounted upon the bracket 144 by means of a pivot pm at 150 extending into the bearing 148 is a magazine frame plate 151. Pivotally mounted upon the bracket 146 by means of extending into the bearing 149 is a magazine frame plate 1'5'3. The two plates 151 and 153 are similar to each other except that they are oppositely formed, and the mechanisms carried by the plates are similar except that they are oppositely formed. A detailed description of Ibut one of the plates and of the `mechanism carried thereby will be sufficient, the plate 151 and the corresponding mechanism being shown in detail in Figs. 14 and 15. Secured to the plate 1:51 are two relatively long guide bars 154 and 155 which taken together form one of the body parts of the magazine. These bars are preferably angle-shaped in cross section, having flanges which project outward and having webs which are connected to the plate 151.- Preferably, as shown, the bars are adjustable with respect to the plate, each ar having two vertical .guide tongues 156 and 157 which are slidable in vertical guide ways |formed in the plate. The web of each .angle bar is provided with slotted apertures a pivot pin at 152E 158 parallel to the guide tongues156. and 157, and screws 159 extending througlithese apertures and entering the plate serve to lock the bars in adjusted positions. Ireferably I provide means 'whereby the bars can 'be adjusted simultaneously and uniformly with respect to a iixed center line. As shown, the plate 151 has a recess 160 in which is pivotally mounted a lever 161, the pivot of the lever being at the aforesaid fixed center line. The lever is provided with two slots 16'2 and 163 positioned at equal distances from the pivot and receiving pins carried respectively by the bars 154; and 155.

- It will be seen that by loosening the screws 159 the two bars 151 and 155 can be Amoved equal distances in opposite directions by means of the lever 161, the bars being guided `by the tongues 156 and 157. After adjustment the screws 159 are tightened, thus locking the bars in adjusted positions.

It will be understood as aforesaid, that the plate 153 is provided with mechanism similar to that. already described. The two opposite'sets of bars 154. and 155 serve as guides for the ends of the blanks to be ground, and by adjusting the bars in the way described the mechanism can be adapted for blanks of different diameters. In fact, by differently adjusting the devices on the two plates the mechanism can be adapted for blanks having different diameters at the two ends.

At the lower end of each bar 155 there is provided a lip 164 which serves to prevent the movement of the blanks by gravity out of the bottom lof the magazine. By referring to Fig. 14 and observing the dot-anddash lines thereof, it will be noted that the lip 164 is so positioned and that the guide tongues 156 and 157 are at such an angle,

that as the bars 1154 and 155 are separated or moved toward each other the lip 161 is moved downward or upward exactly to the extent necessary to maintain the axis of the lowermost blank in iXed position, notwithstanding differences in the size thereof. It will be understood that Fig. 11 shows the magazine with the lowermost blank in alinement with the centers 5 and 6. Fig. 15 shows the mechanism adjusted for very small blanks. i j

Each plate 151 and 153 is provided with a depending arm 165 having a slot 166 through which extends a horizontal rod 167. This rod 167 is carriedby levers 168, 168 which are. mounted upon a horizontal rock shaft 169. The rock shaft is mounted in bearings 170. 170 which are formed in brackets depending from the table 79.

Secured to the rock shaft 169 is an operating arm 171 provided at its end with a roller 172. Secured to the. cam drum 113 is a cam plate. 173 adapted to engage the roller 17:2 and swing the arm 171 downward. For

ydrawing is the position which it occupies when supplying a fresh blank to be ground. lith the grinding mechanism in its normal position the roller 172 is in its uppermost position. When a blank has been 'ground and has been discharged the roller 172 is engaged by the cam plate 173 and is forced downward, ythus serving by means of the rock shaft 169, the rod 167 and the other parts described, to swing the magazine mechanism forward to the position shown in full lines in the drawings. In this position the lowermost blank in the magazine is -in exact alinement with the centers 5 and 6 and the vcenter 6 is moved toward the left in the way already described, thus moving the lowermost blank toward the left and into engagement with the center 5. When the `blank has been thus engaged by the centers the continued movement of the cam drum brings the cam surface 174 into engagement with the roller 172 whereupon the roller is moved upward, thus restoring the magazine mechanism to the normal position shown b v dotted lines in Fig. 15. As the magazine is moved backward the lowermost blank vwhich has been engaged by the centers is drawn out and the other blanks slide downward to bring another blank into' position to be engaged upon the next movement of the magazine.

It will be observed that the two main cams are so correlated that they do not interfere with each other. The vibratory motion resulting from the cam plates` and 7 6 begins after the several cam plates on the drum 4113 have disengaged their respective rollers: and the vibratory motion ceases when the said cam plates again engage their respective rollers. It will furthermore be observed that the aXis of the pivot 81 for the cable 79 is in the same transverse vertical plane as the aXis of the cam drum 113.

It is therefore possible to adjust the table 79 about the axis 81 without materially changing the positions of the several rollers with respect to the cam drum and the cam plates carried thereby.

What I claim is: l 1. In a grinding machine, the combination of a grinding wheel, means for holding and sition and for moving the wheel away from the axis of the holding meansv outof grind: ing position, and driving means for causing the said mechanism to move slowly durlng grinding and rapidly at all other times.

2. In a grinding machine, the comblnatlon of a grinding wheel, means for holding and turning the tool to be ground, a magazme for unground tools, automatlc mechamsm for successively supplying an unground tool from the magazine to the holding means, for moving the wheel `toward the axis of the holding means into grinding position and for moving the wheel away from the axis of `the holding means out of grindingV position,

driving means for causing the said mechanism to move slowly during grindingand rapidly at all other times, and means for varying the said slow movement of the driving means without changing the rapid movement thereof.

3. In a grinding machine, the combination of means for holding a tool, a grinding wheel, a magazine for unground tools, and' mechanism for successively moving the wheel and the magazine toward and from the axis of the holding means, the magazine at each movement supplying a tool to the holding means and the grinding wheel at each movement grinding a tool so supplied.

4. In a grinding machine, the combination of'means for holding a tool. a grinding wheel, a magazine for unground tools, mechanism for successively moving the wheel and the magazine toward and from the axis of the holding means, the magazine at each movement supplying a tool to the holding means and the grinding wheel at each movement grinding a tool so supplied, and means for causing the holding means to engage an unground tool at each forward movement of themagazineand to release the ground tool at each backwardl movement of the wheel.

5. In a grinding machine, the combination of means for holding a tool, a` grinding wheel, a magazine forunground tools, automatic mechanism for successively moving the wheel and the magazine towardv and from the axis of the holding means, the magazine at each movement supplying a tool to the holding means each movement supplied, and rdriving means for causing the said mechanism to move slowly during grinding and rapidlyY at all other times.

6. In a grinding machine. the combination of means for holding a tool, a grinding wheel, a magazine for unground tools. automatic mechanism for successively moving the wheel and the magazine toward and Jfrom the axis of the holding means, the magazine at each movement supplying a tool to the holding means and the grinding wheel at each movement serving to grind and the grinding wheel at serving to grind a tool so' a tool so supplied, driving means for causing the said mechanism to'move slowly during grinding and rapidly at all other times, and means for varying the said slow movement of the driving means without changing the rapid movement thereof.

7. In a grinding machine, the combination of means for holding a tool, a grinding wheel, a magazine for unground tools, automatic mechanism for successively moving the wheel and the magazine toward and from the axis of the holding means, the magazine at each movement supplying a tool to the holding means and the grinding wheel at each movement grinding a tool so supplied, mechanism for causing the holding means to engage an unground tool at each forward movement of the magazine and to release the ground tool at each backfward movement of the wheel, and driving means for the said mechanism arranged to operate slowly'` during grinding and rapidly at all other times.

8. In a grinding machine, the combination of means for holding a tool, a broadfaced grinding Wheel adapted to engage the tool alon the entire length of the part to be groun a magazine for unground tools, mechanism acting automatically upon the completion of grinding of a tool to discharge 'the tool and to supply an unground tool from the magazine to the holding means, and means operable during grinding and inoperable during the discharging andsupplying of tools for vibrating the holding means parallelly with the face of the wheel. 9. In a grinding machine, the combination of a movable table, means on the table for holding a tool, a grinding wheel adapted to engage the tool, a magazine on the table for holding unground tools, a rotatable cam mounted independently of the table, and actuating mechanism on the table operated by the cam'and acting automatically upon the completion of grinding of a tool to discharge the tool and to supply an unground tool from the magazine to the holding means.

10. Ina grinding machine, the combination of a movable table, means on the table for holding a tool, a broad-faced grinding wheel adapted to engage the tool along the entire length of the part to be ground, a magazine on the table for holding unground tools, a rotatable cam mounted independently of the table, actuating mechanism on the table operated by the cam and acting automatically upon the completion of grinding of a 'tool to discharge the tool and to supply an unground tool from the magazine to the holding means. and means operable during grinding for vibrating the table parallelly with the face of the wheel, the said means being inoperative when the actuating mechanism is being operated by the cam.

11. In a grinding machine, the combina- 1 wheel adapted to tion of a movabletable,

ma azine on the table for holding unground' too s, actuating mechanism on the table adapted to discharge a ground tool from the holding means and to supply an un.

ground tool from the magazine to the holding means, and two synchronously rotatable cams acting alternately in succession, one to` operate the said actuating mechanism and the other to vibrate the holding means parallelly with the face of the wheel.

' 12. In a grindingmachine, the combination of an angularlyadjustable table, means on the table for holding a tool, a grinding engage the tool, a magazine on the table for holding unground tools, and actuating mechanism on the table acting automatically upon the completion of grinding of a tool to discharge the tool and to supply. an unground tool from the magazine to .the holding means.

13. In Va grinding machine, the combina- 1 tion of la .table horizontally adjustable anguerated by ,mounted independently broad-faced grinding wheel adapted larly, means on the table for holding a tool, a grindingwheel adapted to engage the tool, a magazine .on ground tools, a vertical rotatable cam of the table, and actuating mechanism on the table operated by the cam and acting automatically upon the completion of grinding of a tool to discharge the tool and to supply an unground tool from the magazine to the'4 holding means, the cam being so positioned with respect to the axis of table adjustment asto permit such adjustment without. disturbing the relationship between the cam -and the actuating mechanism. v

14. Inj a grinding machine, the combination ci a-movable slide, a table horizontally adjustable angularly' on the slide, means on the table for holding a tool, a

to engage the tool along .the entire length of the part to'be ground, a magazine on the table for holding unground tools, a vertical`rotatable cam mounted independently of the table, actuating mechanism on the table opthe cam and acting automatically upon the completion-of grinding'of a tool to discharge t e tool and to supply an un ground toolfrom the magazine to the `holdf ing means, the cam being so positioned with 'respect tothe axis of table adjustment'as to "permit such adjustment without disturbing the table for holding 11n,-`

.the relationship between the cam and the actuating mechanism, during grinding and means operable for vibrating the slide parallelly with the face of the wheel, the said means being inoperative when the actuating mechanism is being operated by the cam.

15.Ina

grinding machine, the combination of a grinding wheel, a headstock and a tailstock each provided with a center vadapted magazine two sections mounted respectively on the to engage a toolto be ground, a

for unground tools comprising headstock and the tailstock, and means for 'moving the magazine to cause it to supply an ungroundtool to the centers.

16. In a tion of a grinding wheel, a headstock and grinding machine, the combinaa tailstock each provided with a center adapted to magazine engage a tool to be ground, a for unground tools comprising two sections mounted respectively on thel headstock nally i adjustable means for to supply- 17. In a tion of a grinding and the tailstock and longitudirelatively thereto, and moving the magazine to cause it an `unground tool to the centers. grinding machine, the combinawheel, a headstock and a tailstock adjustable toward or away from each other adapted to engage magazine two sections mounted respectively on the headstock each provided with a center a tool .to be ground, a for unground tools comprising and 'and the ta'lstock and adjustable therewith whereby the `length of the magazine is changed as the distance between centers is changed, and means for moving the magazine to cause it to supply an unground tool to the centers.

18.Ina

grinding machine, the combination of a grinding wheel, means adapted to hold atool to bexground, a magazine for unground tools having two sections each co m l prising two parallel bars anda lip carried lower end of one bar, means y the' moving the magazine to a [to carry the lowermst tool engaged by the 5 lip into alinement y; and means tion toward or from same time moving the ma azine may l of diiferent sizes without 11o the center ofthe lowermost tool out. of alinement with the holding means.

'In testimony whereof, I heretowhereby accommodate too moving signature.

for forward position l with the holding means, for adjusting the bars 4of each sec= each otherand at ,the them longitudi1 1ally,- be changed to" rninnnnmn MULLER.

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