US1355167A

US1355167A - Milling-machine

Info

Publication number: US1355167A
Application number: US221109A
Authority: US
Inventors: Charles A Rich
Original assignee: Brown and Sharpe Manufacturing Co
Current assignee: Brown and Sharpe Manufacturing Co
Priority date: 1918-03-08
Filing date: 1918-03-08
Publication date: 1920-10-12
Anticipated expiration: 1937-10-12

Description

. Cr. RICH.

MILLING MGHINE. APPLICATION FILED nlm. s, 191s.

1,355,167. Patented 0 ne12,1920."V

8 SHEETS-SHEET l.

uvzN-roR im# l @mm/W C. A. RICH.

MILLING MACHINE. 'APPLICATION FILED MMLB, 1918.

8 SHEETS-SHEET 2.

INvgNroR I aw- 4M y rw Patented Oct. 12, 1920.

C. A. RICH.

MILLING MACHINE.

APPLICATION FILED MAR. a, I9Is.

1,355,167. rammed III.12,1920.r

8 SHEETS-SHEET 3.

InIvENI-OR l @gz-mam frw v c. A. mcH. MILLING MACHINE. APPLICATION FILED MAR- 8, ISIB- Patented Oct. 12, 1920.

8 SHEETS-SHEET 4.

C. A. RICH.

MILLING MACHINE.A

APPLICATION FILED IIIAII. s. 191s.

1,355,167. ma@ oct 12,1920.

8 SHEETS-SHEET 5.

MMQM I vwai www #1 C. A. RICH.

MILLING MACHINE.

APPLICATION FILED MAR. s. 191e.

NvENToR C. A. RICH.

MILLING MACHINE.

APPLICATION msn MAR. s. 1918.

1,355,16?, Patented Oct. 12,1920.

8 SHEETS-SHEET 7.

lNvrzNToR C. A. RICH.

MILLING MACHINE.

APPucmon man MAR. s, 191s.

1,855,167. Patented o0t.'12,'192o.

8 SHEETS-SHEET 8.

INVENTOR www UNITED STATES PATENT omer.,

CHALLES A. RICH, OF PROVIDENCE, RHODE ISIiAND, AISSIGNOR TO BROWN AND SHARPE MANUFACTURING COMPANY, 0F PROVIDENCE, RHODE ISLAND,A COR- PORATION 0F RHODE ISLAND.

Specication of Letters Patent.

Patented Oct. 12, 1920.

Application led March 8, l1918-. Serial No. 221,109. v

To all twhom z't may concern:

Be it known that I, CHARLES A. RICH, a citizen of the United States, residing at Providence, in the county of Providence and State of Rhode Island, have invented certain new and useful Improvements in Mill-4 -by intermittent milling, or by continuous milling. In automatic milling the work supporting table is fed at a fast speed to bring the Work up to the cutter, then at a slow speed during the cutting, is then reversed and returned at a fast speed to its starting point, and is then stopped, all of these operations being automatically eected. In intermittent milling several pieces of work or several spaced surfaces on the jsame piece are successively milled during the forward travel of the table, and in this case there may be a fast feed of the table to bring each piece or surface up to the cutter after the preceding piece or surface has been milled, as well as a fast feed to brin the first piece upto the cutter. In

continuous' milling a piece of work is milled during the travel of the table in eachdirection, and the operator removes a finished piece from each end of the table and replaces it with another, while a piece of work at the other end of the table is being milled. In this case the table may be reversed at each end of its travel and may be fed at a fast speed during the first part of its travel in each direction to bring the unfinished piece of Work up to the cutter, and at a slow speed during the remainder of its travel while the cutter is milling this piece of work.

It is the primary object of the invention to provide an improved mechanical control for the Work supporting table and coperating parts which will adapt the machine to do any of the forms of milling outlined above. o this end a feature of the inven; tion consists 1 n transmitting motion to the work supporting table through a mechanical feed train including mechanism for r changingthe speed and' for changing the d1rect1on of travel of the table, which may be so controlled by tripping devices, suchv as trippmg dogs, connected to move with or in unison with the support, that the table may be reversed when traveling at a slow speed or at a fast speed, and the speed of the support may be' chan ed during its travel in each direction. he mechanism for changing the direction of travel of the support, and the mechanism for imparting a fast or slow feed to the support, are preferably so arranged in the train that mot1on is transmitted to the support from one of these mechanisms through the other. This enables the feed to be readily changed from-fast to slow and from.I slow to fast at any desired point or points in the travel of the support in either direction by proper adjustment of the tripping dogs, and-without affecting the mechanism for reversing or stopping the support, the operationof which maybe 'independently controlled by the corresponding tripping dogs.

In doing some classes of work it is desir-3A 'able that the rotation of the cutter spindle be stopped during the return travel of the; finished work past the cutter in order to avoid marking the milled surfaces. To secure this result without interfering with the automatic operation of the machinej'mecha# nism is.provid`ed for stopping and starting the spindle, which may be so controlled-that;

the spindle stops as the Work support is automatically reversed, land again starts fore or at the same time that an unfinished piece of work is presented to the cutter. The

, spindle stopping'and starting mechanism is preferably `thus controlled by the speedy changing mechanism, orby the speed changing and the reversing mechanisms for the work support through connections which when activegwillcause the spindle to be stopped as the support is reversed, and to be started as the change is ymade from the sis fast to the slow feed. The spindle may f therefore be stopped in automatic or infter- 'mittent milling as the support is reversed at the end of its forward travel, and be again started as the feedis changed from fast touslo-w after the work is vbrought up `to the cutter at the beginning of the next forward travel of the support. In continuous milling the spindle may be stopped as the support is reversed at each end of its during the return travel of the table the cutter would cut with the feed, a condition which has proved to be unsatisfactory for' practically all classes of work. It has been customary, therefore, to use end mills or cutters when doing continuous milling, and this manner of milling has been confined to work which is adapted for this type of cutter.A A feature of the invention which enables continuous milling to be successfully done with plain or form milling cutters, and thus adapts the machine for work which could not `heretofore'be done in this manner, consists in the provision of mechanism for reversing the directiony of rotation of the cutter spindle which may be so controlled that the spindle is rotated during the A return travel of the worksupport in a .35.

direction opposite to that in which it is rotated during the forward travel of the support. Two oppositely arranged cutters may then be secured on the spindle to operate on the Work onopposite ends of the support, and each cutter may be rotated to cut 7glainst the -feed during the milling action.

e spindle reversing mechanism is prefer-v ably operated from the mechanism for reversing the work support, so that both 'reversing mechanisms are simultaneously operated as the work support reaches the end of its travel in each direction. The

spindle reversing mechanism. may be ren-y dered active or inactive at the will of the operator, and may be used with or withou vthe spindle stopping mechanism.

' The features outlined above, as well as the further features of invention which are de` fined in the claims, are illustrated in the accompanying drawings, in which Fi re 1 is a right-hand side elevation of a mil ing machine embodying all the features of the invention in their preferred forms; Fig. 2 is a left-hand side elevation of the machine; Fig. 3 is a partial front view showing the machine set up for intermittent milling; Fig. 4 is a similar view showing the machine set up l,for continuous milling; Fig. 5-is a partial end view of the work supperting table looking toward the right in Fig. 3;

.which includes mechanism for feeding the horizontal sectional view on line 8-8, Figs.

2 and 7 Fig. 9 is a detail showing the means 70 'for rendering the spindle reversing mechanism inactive; Fig. 10 is a detail elevation looking toward the left in Fig. 8, showing the clutch for' the speed changing cam; Fig. 11 is a sectional elevation on line 11'-11, Fig.' 6; Fig. 12 is a horizontal sectional view on line 12, Fig. 1; Fig.l13 is a horizontal sectional view on line 13-13, Fig. 1; Fig. 14 isa horizontalsectional view on 1ine.14-14, Fig. 1; and Fig. 15 is a vertical sectional view on line 15-15, F ig. 13.

The milling machine shown in the draW- ings is provided with a rota cutter spindle 2 and a work support table 4 mounted to reciprocate in a transversely movable saddle 6 which is in turn mounted upon a vertically movable knee 8. Motion is transmitted to the table through a mechanical feed train table at fast and slow speeds, and mechanisr for reversing the direction of the travel of the table.` As shown, the feed train comprises a vertical shaft 10 mounted- ,in the saddle, and provided at its upper end with a pinion 12 engaging a rack on the tabla and provided at its lower end with a 4bevel gear 16 which is engaged by .a pinion 18 on the end of a horizontal shaft 2() (Figs. 3 and 4).' The fast and slow feed mechanism is mounted on the saddle, and as indicated in Figs. 1 and 13 to 15, comprises a shaft 22 provided with a pinion 24 engaging a gear 26 on the shaft 20, and also provided with a clutch 28 which may be engaged with either a fast or slow speed train of gearing.

The clutch is pinned to the shaft and is ar ranged betweenI a fast speed gear 30 and a slowspeed worm wheel 32 which are loosely mounted on the shaft. The fast speed gear 30 is a spiral gear, and is engaged and 110 driven by a similar gear 34 secured to a shaft 36 which underlies the shaft 2 2 and is driven through an extensible shaft 38 and

universal joints

40 and 42 from a shaft 44 which is mounted on a fixed part of the 115 machine and is shown in Fig. 6. The slow speed worm wheel 32 is engaged by a -worm 46 secured to a shaft 48 which is driven from the shaft ,36 through a system of change gears 50- which maybe adjusted to 120 vary the slow feed given to the table during the action of the cutter on the work. The clutch 28 is shifted to change the speed of the feed by an intermittently rotating cam 52 loosely mounted on a fixed 125 shaft 54 and engaging a clutch shifting lever 56. The lever is connected to a rock shaft 58 provided with a gear segment engaging a rack formed on a sleeve 60 which is mounted on the endof the shaft 22. A

spring 62 forms a yielding connection between the sleeve and shaft which may yield in case the clutchteeth land when the cam is operated to shift the clutch. l The means for operating theclutch shifting cam comprises a clutch sleeve V64 connected with the; cam by asliding coupling 66 and forced by a spring 68 in a direction to engage its clutch teeth with the clutch teeth' formed on a gear 70. The -gear 70 is a s iral gear loosely mounted on the fixed sha 54 and driven from the shaft -36.through a similar gear 72. The engagement and disengagement of the clutch 64, and 'consequentl the shifting of the speed changing clutc .28, is controlled by' two plungers 74 and 76 arranged '74 is retracted to withdraw it from engagement with the cam 78, and the plunger 76 is advanced into the path of the cam 80, so

that the clutch' 64 is engaged, is driven through a half revolution, and is then disengaged by the engagement of the cam 80 with the plun er 76. In a similar manner the feed may e changed from slow to fast by withdrawing the plunger 76 and ad- -vancing the plunger 74, so that the clutch 64 will turn the vclutch shifting cam through a' half revolution and shiftthe speed chang- 'ing clutch from the slow speed worm vwheel to the fast speed gear. The plungers may be alternately advanced and retracted through a horizontal rock shaft 82 provided with a pinion 84' engaging circular racks 86 on the plungers. f The rock shaft extends beyond the front side of the saddle and is provided at its outer end with a handle 88`through which it may be manually operated to shift the plungers. The rock shaft may be automatically rocked throughv vertical tripping plungers 90 and 92 which are provided with rack teeth engaging a pinion 94 on the shaft, and are provided` with upper lV-shaped ends arranged to project into the paths of tripping dogs 96 and 98 which are connected to move in unison with the table, preferably by being adjustably secured to guideways formed on the side of the table.l The plungers are arranged out of alinement with each other lengthwise of the table, and the dogs 96 are arranged to engage and' depress the plunger 92, while the dogs 98 are arranged to engage and depress the plunger 90. The parts are so arranged that the tablewill be l fed at fast speed when the plungeris down and the plunger 92 is up, and the table will be fed at a sloiwl speed when'theplunger 92 is down and the-plunger 90 up. The dogs 98, therefore, which act to depress the plunger 90, may be adj-usted to change the feed from slow to fast at anypoint in the travel of the table in either' direction, and the dogs 96 which depress the plungers 92 may be adjusted to change the feed from fast to slow at any point inthe travel of the table in either' direction. The dogs 96 as shown are one-way' dogs -which will act to depress the plunger 92 during v the travel of the table in one direction, but will ride idly over the lunger during the travel of the table in t e other direction, since it is usually undesirable to change the feed from fast to slow at the same point in the travel of the table ,in each direction.v

The mechanism for reversing the direction of travel of the table comprises a reversing clutch 100 connected .to slide onf and to rotate the shaft 44 through which motion is transmitted to the'fast and. slow feed mechanism on the saddle (Fi 6).l The clutch is arranged between an to be engagedwith either a-forward drive clutch member -102 or a return drive Iclutch is adapted member 104. The clutch member 102 is driven continuously from a pinion 106 on the driving shaft 108 through an intermediate gear 110 which engages a gear A112'secured to the clutch member. clutch member 104 is continuously driven in a reverse direction through an intermediate bevelgear 114 which engages a bevel .gear formed on-the gear 112 and a vbevel gear 116 secured to the return clutch member.. A

The reversing clutch is shifted through a lever 118 which is operated by a cam groove 120 formed in a cam sleeve 122 whichv may be given a half revolution to shift the' reversing clutch from one clutch driving member tothe other, or may be given successive quarter turns to shift the clutch from one driving clutch member into neu'- tral position, and then from neutral position into engagement with the otherfdriv- The return4 ing clutch member. The mechanismlfor in termittently rotating lthe cam sleeve-fis similar to the mechanism for rotating the speed clutch cam 52 already described, and compart, as indicated in Figs. 8 and 10a the low part on one cam being 90 in advancel cam during the advance and withdrawalof the plungers, and with a single surface 144 adapted to coperate with a single step of the cam during the advance and withdrawal of the plungers. If the plungers are positioned aS indicated in Figs. 8 and 10, so that'the single surfaces 144 are in active relation to the

cams

132 and 134,v

, the clutch sleeve and reversing clutch shifting cam will be given successive halfrevolutions by alternately advancingv and) retract# ing the plungers. With the parts in the position shown, the clutch sleeve 124 is held out of engagement with the clutch member ,126 by the engagement of the low part of the cam 132 with the plunger 136, and the reversing clutch is in engagement with the return drive clutch member 104 and the table istraveling from right to left. When the travel of the'table is to be reversed, the plunger 136 is retracted to disengage the surface 144 from the low part of the cam 132, and the plunger 138 is advanced to bring its surface 144 into the path of the low part of the cam 134, so that the clutch shifting cam will make a half revolution. ln the same way the clutch is shifted to reverse the table at the other end of its travel by retracting. thel plunger 138 and advancing the plunger 136. If the table is to be stopped at the end of its travel from right to left and subsequently started in the opposite direction, the plunger 136 may be turned to bring its two-stepped surface 140 and 142 into active relation to the cam 132. Then with the parts in the same lposition as 'indicated in Figs. 8 and 10, the surface 142fon the plunger 136 will be engaged by the low part of the cam 132. When the table reaches the end of its travel from right to left, the lunger 136 will be retracted until the sur ace 142 disengages the low part of the cam 132, thus allowing the clutch sleeve 126 to engage the clutch member 124. The clutch sleeve will now be driven through a quarter revolution, or until the high part of the cam 132 engages the surface 140 on the plunger 136, when the clutch sleeve will be disengaged. The reversing clutch cam will therefore be given but a quarter revolution, and 'the clutch will be shifted into mid-position to stop the table. When the table is to be started, the withdrawal of the plunger 136 will be completed, thus disengaging its surface 140 from the high vpart 'of the cam 132 and vthe tripping plungers.

bringing the surface 144 (or the surface 142, as the case may be) into the path of the low part of the cam 134, which is 90 behindthe`high part of the cam 132. The reversing'clutch cam will therefore be given another quarter revolution to complete the shifting of the clutch and thus start the table in the opposite direction. By similarly adjusting the plunger 138 the table may be stopped and started'in the same manner at the other end of its travel.

The

plungers

136 and 138 are retracted and advanced by two

intermeshing pinions

146 and 148 which engage racks formed on the plungers. The plungers are held in adjusted positionby pins 150 arranged to engage one or the other of two diametrically opposite grooves 152 formed in the plungers. Each plunger is provided with a handle, 154 by which it may be conveniently turned through a half revolution to bring either groove 152 into position to be engaged by the pin 150, the pin being with. drawn to permit the adjustment of the plunger. The

pinions

146 and 148 are rocked to operate the plungers through a'rock shaft 156 mounted on the saddle and connected with the pinion 146 through an extensible vided with V-shaped upper` ends arranged to be'engaged by tripping dogs 170 and 172.

which are connected to move with the table preferably by beingadjustably secured on the side of the table (Figs. 3, 4 and 5). If both dogs 170 and 172 are long dogs, as indicated in Fig. 4, the tripping plungers will be operated to retract and advance the controlling

plungers

136 and 138 in a single stage movement to reverse the table at the end of its travel in each direction. If one of the dogs is a short dog, as indicated at 172 in Fig. 3, while the other dog is a long dog, as indicated at 170, then the tablewill be reversed at the end of its travel toward the right, but at the end of its travel toward the left the short dog 172 will only partially depress the plunger 164, thus partially retracting and advancing the controlling plungers to eii'ect the stopping of the table. The tablermay be reversed even with the

plungers

136 and 138 adjusted in the reverse position to that indicated in Fi 8, provided the table is being fed at t e fast speed when the tripping dog or 172 acts on In this case the Withdrawal of the plunger 136 and advance of the plunger 138' is rapid enough to complete the withdrawal of the plunger 136 be- -fore the high step ofthe cam 132 comes into position to act upon the surface 140 of that plunger. The result will be that the clutch 126 will make a half revolution before it is disengaged from the clutch member 124 instead of a quarter revolution, as would be the case if the plunger 136 were withdrawn by the trip dog during the slow feed of the table.` It is usually desirable, however, to adjust the

plungers

136 or 138 as above indicated, so that the clutch will be given a half revolution and thus reverse the table, regardless of the' speed "at which the hplungers are retracted and advanced, since y this adjustment the' table may be reversed at the end yof a cut without first changing the feed of the table from slow to fast.

The mechanism through which motion is transmitted to the spindle 2 comprises mechanism which may be rendered active or inactive at the will ofthe operator for stopping the spindle during the fast feed of the table in either direction, and mechanism which may be rendered active or inactive at the Y will of the operator for reversing the direc'- :tion of rotation of the spindle. As shown in Figs. 6, 7 and 11, the driving shaft 108 is connected by couplings indicatedl at 174` in Fig. 6 with a driving member 176 adapted I to be connected or disconnected with the hollow shaft or sleeve 17 8 by a clutch indicated generally at 180. The clutch is a double clutch arranged between the driving member 176 and a stationary member 182 which is connected with the machine-frame. The clutch is shifted to connect the shaft 178 with the driving member 176, so that the s indle is rotated, or to frictionally connect t e shaft with the stationary member 182 so that the rotation ofthe spindle is stopped. The means for thus shifting the clutch comprises a rock shaft 184 provided at one end with a clutch engaging yoke 186, and at the other end with an arm 188, the lower end l of .which carries a'roll 190 engaging a clutch shifting cam 192,. The mechanism for in' termittently. operating the clutch shifting cam 192 is similar to the mechanism for operating the clutch shifting cam 52, and comprises the clutch sleeve 194.adapted to intermittently engage the continuously rotating clutch member 196, and controlled by the plungers 198 which are alternately advanced and retracted into and out of the paths of diametrically o posite cams 200 on the clutch sleeve. heclutch member`196 is secured to a shaft 202 on which the clutch and cam sleeves are mounted, and is driven con- 'I 21o and universal joints 212 (Fi .1). The f controlling plungers 198 mayt us be re- 7 6 are moved suiiiciently to effect a change in the feed of the table before the plungers 198 have been moved sufficiently to effect a change in the position of the spindle starting and stopping clutch. B y properly proportioning or adjusting the 4trippingl` dogs 98 therefore, changes from slow to fast feed may be effected at certain points in the travel of the table without stopping the s indle, while the change from'slow to fast eedA at other points in the traveliofthe table will result in a stopping ofthe spindle.

The mechanism for starting and stopping isps the spindle may be rendered inactive by the operator by turning a rock shaft 214 into such position that an eccentric stop pin 216 on its rear end will engage a flange 218 on the clutch sleeve 194 and prevent its ve'ngagement with the member '196 wh'en the lungers 198 are retracted and advanced. y turning the rock shaft 214 through a half revolution, the eccentric stop pin 216 is moved out 'of active position, and'thus'the' spindle stoppin is rendered active..

The mechanism for reversing the direction of rotation of the spindle comprises a clutch indicatedV generally at 220 which is connected to the hollow shaft 178 and is arranged between two oppositely arranged' bevel gears 222 which are loosely mounted on `the shaft 4 17 8, and are provided with clutch members 224 arranged to be alternately engaged by the clutch 220 (Fig. 6). The gears 222 engage the opposite sides of a bevel gear 226. The gear 226 is secured -to the inner end of a, short shaft, the outer end of which carries a'gear 228v forming one of a series of change gears 230 through which motion is transmitted to a shaft 232 l(Figs. 1 and 11). carries a bevel gear 234 which meshes with a gear 236 on the spindle.

The mechanism for shifting the clutch 220 from' one member 224 to the other to reg and starting mechanism A The inner end of the shaft 232 verse the spindle comprises a rock shaft 238 provided with a clutch enga 'ng yoke l'and with a depending arm 240. of .the arm is connected to one end of a link 242, the other end of which is'providedwith a notch 244 adapted to engage a pin 246 o`n he lower end the upper end of a clutch shifting' lever 248 (Figs. 6,'7 and 9). The lower end ofthe lever248 is provided with-a roll arranged to be engaged byc'am's '250 on the camfsleeve verse the spindle when the reversing clutch 100 for the work supporting table is shifted to reverse the direction of travel of the table.

The mechanism for rotating the spindle in Opposite directions during the forward and return travel of the table enables plain or form milling cutters to be arranged on the spindle to act upon work on the table during its return as well as during its forward movement. Thus two oppositely arranged

cutters

252 and 254 such as indicated in Figs. 1 and 4, may be secured upon the spindle so that they are out of line with each other lengthwise of the table, and the spindle may be rotated clockwise during the forward travel of the table from left to right,'so that the cutter 254 will act against the feed during the milling of a piece of work 256, and may be rotated contra-clockwise durin the travel of the table from right to le so thatvthe cutter 252 will act against the feed during the milling of the piece of work 258. The automatic reversal of the spindle when the table is reversed enables continuous milling to be done.l with plain or form cutters which may be secured to the spindle, as'indicated in Figs. 1 and 4, and rotated in a direction to act against the feed during the slow travel of the table in either direction. l

' The mechanism for automatically reversing the spindle may be rendered active or inactive at the will of thel operator by mani ulation of a rock shaft 260 (Figs. 7 and 9 The inner end o f the rock shaft is provided with an eccentric cam projection 262 arranged to engage the end of the link 242 and disengage lthe notch 244 fromthe pin 246, thus disconnecting the llink from the clutch shifting lever 248.-.`The link may be disconnected when the clutch 220 is i'n engagement with either of the clutch members 224, and the spindle may therefore be continuously driven in either direction.

When the work supporting table is reversedthe beginning of its movement in the reverse direction should usually if not always be at the .fast speed. It is desirable therefore that the fast speed feed should be rendered active whenever the table is reversed. This is particularly so when milling up to a shoulder, since in this case the slow feed must continue to the end of the travel of the table. In order that the fast feed may be automatically rendered active whenever the table is reversed, means is provided for controlling thechange from slow to fast s eed from the table reversing mechanism.

n the construction shown this means com-A prises two cams 264' formed on the clutch sleeve 124, and therefore connected to rotate with the cam 120 which shifts the table reversing clutch 100. The cams 264 are arranged to operate a vertically movable rod 266, the upper end of which is provided with a rack engaging the pinion 206 QFigs. 1, 6 and 12). As already described, this pinion is connected through the pinion 208 and shaft 210 with the rock shaft 82 which retracts and advances the plungers 74 and 76 which control the speed of the table feed. The parts are shown in the drawings in the positions which they occupy whenthe fast feed is in action and the rod 266 is in its lraised position.l One of the cams 264 has passed from under the rod 'so that it is free to move downward when the table feed is changed from fast to slow by rocking the shaft 82, which movement is accompanied by a partial rotation of the

pinions

208 and 206 and the withdrawal of one of the plungers 198 and the advance ofthe other, as heretofore described. During the half. (or quarter) revolution .of the cam sleeve 122 which shifts the table reversing clutch 100 into the clutch member 102 and thus reverses the table, the cam 264 shown at the lbwer side of the clutch sleeve 124' in Fig. 6 rides under the rod 266 and raises it into the position indicated in the drawings. This movement of the rod rotates the

pinions

206 and 208 and rocks the shaft 82 to withdraw the plunger 76 and advance the plunger 74 so that the feed of the table is changed from slow to fast as the table is reversed.

,Since they connection between the table reversing mechanism vand the change speed mechanism is through the -

pinions

206 and 208, the spindle stopping and starting mechanism may also be controlled from the table reversing mechanism to sto the spindle whenever the table is reverse 'In this case the spindle stopping and starting mechanism will be controlled from the speedv changing mechanism to start the -s indle when the table feed is chan ed from ast to slow as previously describe In doing'continuous milling, therefore, the table may vbe automatically reversed at each end of its travel in either direction, and fed at a fast speed during the first part of each reverse movement, and the spindle may or may not be stopped as the table is reversed, and if stopped it may be again started when the feed is changed from fast to slow after the table has partially completed its movement in either direction. By its connection with the table reversing mechanism. thecspindle reversing clutch may also be^ shifted when the table is reversed so that when started the spindle will rotate in a direction the reverse of that in which it rotated during the travel of the table in the opposite direction.

By proper arrangement and adjustment of the tripping dogs which act upon the tripping plungers 90 land 92 and y164 and 166, the various mechanisms of the machine lll . have been acted on by the cutter.

in the-direction of thearrow, or toward the right, andthe milling cutter lhas just finished milling the second piece of work secured on the' table. The second dog 98 has partially depressed the tripping plunger 90, and the feed of the table is about to be changed from slow to fastthrough the controlling devices already described. After the plunger 90 is depressed by the dog 98 the travel of the table will be at a fast speed until the third dog 96 engages the plunger 92 and depresses it. The feed of the table will then be changed from fast to slow, and this will occur just as the third piece of work is brought up to the cutter. The slow feed will continue during the milling of this piece, and then the third dog 98 will act on the plunger 90 to again change the feed from slow to fast. This alternate change of feed from fast to slow and slow to fast will continue until all of the pieces of work As the last piece is finished the reversing dog 170 will engage the plunger 166 and depress it, thus shifting the

plungers

136 and 138 which control the clutch sleeve 124, so that the clutch sleeve and the cams connected i therewith will be given a half revolution to' reverse the table, change the feed from slow to fast, andv to stopthe spindle in case theA spindle stopping and starting mechanism is active. The change from slow to fast feed of the table and not stop the spindle when the feed is changed from slow to fast during the forward or cutting stroke of .the

table, the dogs 98 may beof such a length or so adjusted that the movement transmitted through the plunger 90, while sufricient to effect the changing of the speed, 1s

not suicient to effect the shifting of the spindle stopping and starting clutch. After the finished work has been removed and new pieces of work secured on the table,

the table may be started in the reverse direction, or toward the right, by shifting the handle 164 into the position indicated in Fig. 3. This movement of the handle will complete the movement of the

plungers

166 and 168, so that the clutch sleeve 124 and the cams connected thereto will be given a second quarter revolution to complete the shifting of the table reversing clutch. The

table will be moved at fast speed, and the spindle stopping clutch will remain in stopped position until the irst tripping dog 96 acts upon the plunger 92. The depression of this plunger by the dog will change the speed from fast to slow, and through the connections described .will shift the vplungers 198 to give the spindle stopping clutch cam a half revolution and thus start the spindle. The feed of the table will then be alternately changed from slow to fast and fast to slowv during the travel of the table, as above describe In Fig. 4 an arrangement of tripping dogs requisite for doing continuous milling 1s shown. As here shown the dogs 170 and 172 which operate on the plungers 1'66 and 168 :as the table completes it travel in either direction are both reversing dogs, and the operations described with reference to the arrangement shown in Fig. 3 occur at each end of thetravel of the table, instead of only at the end of its forward'stroke. In this case there is but one change in the speed of the feed during the travel of the table in each direction, namely the change from fast to slow as each piece of work is brought up to its cutter. Two one-way dogs -96 aretherefore secured to the table and are oppositely arranged so that the right-hand dog -acts upon the plunger 92 during the travel of the table toward the left, and rides idly over the plunger during the travel of the table toward the right, while the lefthand dog acts to depress the plunger during the travel of the table toward the right, and ridesl idly over the plunger during the travel of the table toward the left. In ca'se plain milling orform cutters such as shown in Figs. 1 and 4 are used, the spindle reversing mechanism is rendered lactive and the spindle stopping mechanism may be rendred active or not as bestsuited to the wor While it is preferred to employ the spef,

lmechanisms to be controlled andy operated by comparatively few tripping dogs which may be conveniently adjusted to secure any desired mode .of operation it will be understood that this construction and arrangement is not essential to the broader features It will also be understood that certain features of the invention are not confined in their application to machines in which the various mechanisms are mechanically driven and mechanically controlled, but'may be embodied withadvantage in machines in which other types of driving or controlling mechv anisms are employed.

What is claimed is l. A machine of the class described havmechanical train through which motion is transmitted to the support including mech-.

anisms for changing the direction and for changing the speed of travel of the support so arranged in the train that motion is transmitted from one mechanism throu h the other, and means including tripping evices connected to move in unison with the support for changing the speed of the support during its travel in each direction and forreversing its direction of travel when moving at either fast o'r slow speed. A

2. A machine of the class described, having, in combination, a traveling support, a mechanical train through which motion is transmitted to the'support including mechanism for changing the direction of travel of the su port andnmechanism for changing the spee of travel of the-support so arranged in the train that motion is transmitted from one -mechanism through the other, and means including tripping devices connected to move in unison with the support for controlling said mechanism to stop or reverse the support when traveling at ast or slow speed.-

3. A machine of the class described, having, in combination, a traveling support, a mechanical train through which motion is transmitted to the support including a motion changing clutch. and a speed changing clutch, mechanism including tripping devices connected to move in unison with the support for shifting the motion changing clutch when the support is traveling at either fast or slow speed to reverse the travel of the support, and mechanism including tripping devices connected to move in unison with the support for shifting the speed changing clutch to change the speed of the table during its travel in either direction. l

',4. A machine of the class described, having, in' combination, a traveling support, a mechanical train through which motion is transmitted to the support including almo- `tion changing clutch and a speed changing the latter clutch includingjtripping evices connected to move in unison with the suport. p 6. A machine of the class described, having, in combination, a traveling support, mechanism for imparting forward andreturn movements to the'support including a clutch which is shifted to reverse the support," a clutch shifting cam, a cam operating clutch, and means for engaging and disen-` gaging the latter clutchincluding tripping devices connected to move in unison with the support.

7 A machine of the class described, having, in combination, a traveling support, mechanism fori imparting forward and turn movements to the support including a clutch which is shifted to reverse or partially' shifted to stop the support, a clutch shifting cam, a clutch for operating the cam, devices for controlling the latter clutch to reverse or stop the support including tripping devices connected to move inunison with the support.

8. A machine of the class described, hav- I ing, in combination, a traveling support, mechanism for imparting vforward and return movements to the support including a clutch which is shifted toreverse vor partially shifted to stop the support, a clutch shifting cam, a clutch for operating the cam, plungers and cooperating cams on the clutch shifting cam for controlling saidclutch, and V means for alternately moving the plungers into and out of the path of the cams including tripping dogs connected to move in unison with the support.

V9. A machine of the class described, having, .in combination, a traveling support, mechanism for imparting forward and return movements to the support -including a clutch which is shifted to reverse or partially shifted to stop the support,-a clutch' shifting cam, a clutch for operating the cam provided with two diametricallyv opposedV two-stepped cams, two plungers arranged to move alternately into and out'of'the path of the cams, and means for alternately advancing and retracting thel plungers' including tripping dogs connected to move in unison with the support and acting to partially retract one 'plunger and advance the other to no ,i

v the support.

10. A machine of the class described, having, in combination, a traveling support,

mechanism for imparting forward and return movements to the support including a' clutch which is shifted to reverse or partially shifted to stop the support, a clutch shifting cam,` a clutch for operatingthe cam provided with two diametrically opposed two-stepped cams, two plungers arranged for movement alternately into and out of the cam paths, veach plunger being provided with two stepped surfaces adapted to co- 'operate successively with the two steps of the corresponding two-stepped cam during the-advance and return of the plunger and with a single surface adapted to coperate with a single step of the cam during the advance and return of the plunger, means whereby the lungers may be adjusted to bring either tiie two-stepped surface or the single surface into coperative relation to the cams, and means for advancing and re tracting the plungers including trip dogs connected to move with the support.

11. A machine of the class described, having, in combination, a traveling support,

vmechanism for imparting forward and return movements to the support including a reversing clutch, a clutch shifting cam, a cam operating clutch, and means for controlling the clutch to impart either quarter turns to the cam to successively stop. and reverse the support or half turns to reverse the support.

12. A machine of the class described, having, in combination, a traveli support, mecha-nism for transmitting motion to the support comprising a fast speed train and a slow speed train, change speed gearing included in the slow speed train, a clutch 'for rendering either train active, a -cam for shifting the clutch, a cam operating clutch, and means for engaging and disengaging the cam operating clutch including tripping devices connected to move in unison with the support. l

13. A machine of the class described, having, in combination, a traveling support, mechanism for transmitting motion to the support comprising a forward drive train and a return drive train, a fast speed train and a slow speed tra-in, change speed gearing included in the slow speed train, a clutch for rendering the fast or slow train active, al

clutch for rendering the forward or return drive train active, and means controlled by tripping devices connected to move in unison with the support for shifting either clutch from one train to the other when the other clutch is connected with either train.

14. A machine of the class described, having, in combination, a traveling support,

turn drive trains alternately active, a clutch for rendering the fast and slow trains alternately active, and controlling means including tripping devices connected to move in unison with the support for shitin either clutch. from one train tothe other w en the other clutch is connected with either train.

15. A machine'of the class described, having, in combination, a traveling support, mechanism for transmitting motion to the support including forward and return drive trains and fast and slow speed trains, mechanism for rendering the fast and slow trains alternatelyactive including tripping devices connectedto move in unison with the support, mechanism for rendering the forward and return trains alternately active including tripping devices connected to move in unison with the support, and connections through which the latter mechanism renders the fast train active whenever the forward or return train is rendered active to reverse the directionof travel of the support.

16. A machine of the class described, having, in combination, a traveling support,

' mechanism throughV which motion is trans- -speed active whenever the motion changing clutch is shifted to reverse the travel of the support.

17. A machine of the class described, having, in combination, a traveling support, mechanism through which motion is transmitted to the support including al motion changing clutch and a speed-v changing clutch, cams for shifting the clutches to re- -verse the direction and to change the speed of travel of the support, clutches for operating the cams, means for controlling the engagement and disengagement of the clutches including tripping devices connected to move with the support, and connections between the motion changing cam and the conltrolling means for the change speed cam clutch for bringing the cam into fast speed position when the motion changing cam is moved to reverse the direction of travel. of the support.

18. A machine of the class described, having, in combination, a traveling support,

mechanism for transmitting motion to the support comprising forward and return drive trains and fast and slow speed trains, a clutch for engaging and rendering active 5 either the forward or return train, a clutch for engaging and rendering active either the fast or slow train, a cam for shifting the change speed clutch, a clutch'for operating the cam, controlling devices for the latter clutch including trips connected to move in unison with the-support, -a camfor shifting the motion changing clutch', a clutch for operating the cam, controlling devices for the clutch including trips connected to move in unison with the support, and connections for operating the controlling devices for the speed changing cam clutch from the motion changing cam clutch to engage the speed changing clutch with the fast train when the motion changing cam is operatedv to engage the motion changing clutch with the forward or return train.

19. A machine of the class described, having, in combination, a rotary cutter spindle, a traveling work support, mechanism for advancing, automatically reversing, and returning the work support, and mechanism for stopping the spindle when the support is reversed.

20. A machine ofthe class described, having, in combination, a rotary lcutter spindle, a traveling work support, mechanism for advancing, automatically reversing, and returning the work support, mechanism for stopping the spindle when the support is reversed, and means for rendering the stopping mechanism active or inactive at will.

21. A machine of the class described, having, in combination, a rotary cutter spindle, a traveling work support, mechanism for transmitting motion to the work support including mechanism for reversing the direction and mechanism for changing the speed of travel of the support, means for controlling said mechanisms including tripping devices connected to movein unison with the support, and mechanism for stopping the spindle when the direction of travel of the table is reversed and for starting the spindle when the speed is changed from fast to slow.

22. A. machine of the class described, having, in combination, a rotary cutter spindle, a traveling work support, mechanism for transmitting motion to the work support including mechanism for reversing the direction and mechanism for changing the speed of travel of the support, means for controlling said mechanisms including tripping devices connected to move in unison with the support, mechanism for stopping the spindle when the direction of travel of the table is reversed and for starting the spindle when the speed is changed from fast to slow, and means for rendering the stopping mecha- 5 nism active or inactive at will.

23. A machine of the class described, having, in combination, a rotary cutter spindle,

anism, and means for operating the latter mechanism to stop the spindle when the reversing mechanism is operated to reverse the support and to start the spindle when the speed changing mechanism is operated to change the speed from fast to slow.

24. A machine of the class described, having, in combination, a rotary/spindle, a traveling support, mechanism for transmitting motion to the support includin a motion changing clutch and a spee changing clutch, mechanism for shifting the motion changing clutch to reverse the travel of the support including tripping devices connected to move in unison wlth the support,mecha nism for shifting the speed changing clutch to change the speed of travel of the table including tripping devices connected to move in unison with the support, mechanism for stopping and starting the spindle, and controlling means for the latter mechanism connected vwith the mechanism for shifting the speed changing clutch.

25. A machine of the class described, having, in combination, a rotary spindle, a traveling support, mechanism for transmitting motion to the support including a motion changing clutch an a speed changing clutch,

. mechanism for shifting the motion changing clutch to reverse the travel of the support including tripping devices connected to move in unison with the support, mechanism for shifting the speed changing clutch to change the speed of travel ofthe table including tripping devices connected to move in unison With'thesupport, mechanism for stopping and starting'the spindle, and controlling means for the latter mechanism connected with the mechanism for shifting the speed changing clutch and with the mechanism for shifting the motion changing clutch.

26. A machine of the class described, having, in combination, a rotary spindle, a traveling support, mechanism for transmitting motion to the support including a' motion changing clutch and a speed changing clutch, mechanism for shifting the motion changing clutch to reversethe travel of the support Aincluding tripping devices connected to move motion changing clutch shifting mechanism I to stop the spindlel and operated from thespeed changing clutch shifting mechanism to start the spindle. 27. A machine of ing, in combination, a rotary cutter spindle,

a traveling work support, mechanism for transmitting motion to the Work support,in cludingmechanism for reversingthe direction and mechanism for changin' the speed of travel of the support, meansor controlling said mechanisms including tripping devices connected to move in unison lwith the support, and mechanism for stopping the spindle when the speed is changed from slow to fast and for starting the spindle when the speed is changed from fast to slow.

28. A machine of the class described, having, in combination, a rotary cutter spindle, a traveling support, mechanism through which motion is transmitted to the support including mechanism for alternately changing the speed of the support'from fast to slow and slow to fast duringv its travel, and mechanism for automatical'y stopping lthe spindle upon change from slow to fast and starting it upon change from fast to slow.

29. A machine of the class described, having, in combination, a rotary lcutter spindle, a travelin support, mechanism through which motion is transmitted to the support including mechanism for alternately changing the speed of the sup ort from fast to slow and slow to fast uring its travel, mechanism for automaticall stopping the spindle upon change from s ow to fast and starting it upon change from fast to slow,

` and means for rendering the stopping mechanism active or inactive at will.

30. A machine of the class described, having, in combination, a rotary cutter s indle,

a traveling support, mechanism t rough which motion is transmitted to the sup.

port including mechanism for alternately changing the speed of the support from fast to slow and slow to fast during its travel, mechanism for reversing the direction of travel of the support, mechanism Vfor automatically stopping the spindle upon a change from slow to fast speed and for starting it upon a change from fast to slow, and mechanism through which a reversal in the direction results in a fast travel ofuthe support.

31. A machinegof the class described, having, in combination, a rotary cutter spindle,

a reciprocating work support, mechanism' for imparting a fast travel to the support during the first part and-a slow travel during the last part of its movement in each direction, and mechanism for rotating Ithe spindle in one direction during the forward and in the opposite direction during the re-' turn travel 'of the support.

32. A machine of the class described, having, in combination, a rotary cutter spindle, a reciprocating work support,l mechanism for imparting ast and slow traveling movea v ments to the support in each direction, and the class described, hav-"mechanism for rotating the spindle in one direction during the slow forward travel of the table and in theop'posite direction during the slow return travel of the, table.

33. A machine of the class described, having, in combination, a rotary spindle, a travcling support,` mechanimn through .which motion is transmitted to the table including mechanism for reversing its direction of travel, spindle reversing mechanism through which the spindle maybe rotated during the return travel of the support in a direction the reverse of that in which it is rotated duringthe forward travel of the support.

34. A machine of the class described, having, in combination, a rotary spindle, a

traveling support, mechanism through which v motion is transmitted to the table including mechanism for reversing its directon of. travel, spindle reversing mechanism through which the spindle may be rotated during the return travel of the support in a direction the reverse of that in which it is rotated during the forward travel of the su port, and means for rendering the spin le rejlfersing mechanism active or inactive at w1 35. A machine of the class described, having, in combination, a rotary spindle, a traveling support, mechanism through which motion is transmitted to the support including mechanism Jfor reversing its direction of travelv and mechanism for imparting fast and slow movements thereto when traveling in either direction, and spindle reversing mechanism operated to reverse the spindle when the travel of the support is reversed.

36. A machine offthe class described, having, in combination, a rotary spindle, a travelingwork support, mechanism through which motion is transmitted to the support including mechanism for reversing the direction and for changing the speed of travel of the support, means for controlling saidv mechanism including tripping devices connected to move in unison with the support, and mechanism Vfor reversing the spindle.

37. A machine of the class described, having in combination, a rotary cutter'spindle, a work support, mechanism for reciprocating the support, spindle reversing mecha- I msm, spindle starting and stopping mechansm, and means for controlling said mechanisms to im art a fast travel to the support during the rst part and a slow travel during the last part of its movement in each direction, to stop the spindle at the end of the travel of the supportin each direction, and

to start it in a-reverse direction upon the shift from fast to slow.

38. A machine of the class described, having, in combination, a rotary cutterfspindle', a work support, mechanism Jfor reciprocating the support, spindle reversing mechanism, spindle starting and stopping mechanism, means for controlling said mechanisms to impart a fast travel to the support during the first part and a slow travel during the last part of its movement in each direction, to stop the spindle at the end of the travel of the support in each direction, and to start it in a reverse direction upon the shift from fast to slow, and means for rendering either the spindlereversing mechanism or the spindle stopping mechanism active or inactive at will.

39. A machine of the class described, having, in combination, a rotary spindle, a traveling support, mechanism through which motion is transmitted to the support including a motion -changing "clutch and a speed changing clutch, mechanism' for shifting the motion changing clutch to reverse the direction of travel of the support including tripping devices connected to move in unison with the support, mechanism for shifting the speed changing clutch including tripping devices connected to travel in unison with the support, and a spindle reversing clutch operated from the mechanism for shifting the motion changing clutch.

40. A machine of the class described, having, in combination, a rotary spindle, a traveling support, mechanism through -which motion isv transmitted to the support including a motion changing clutch and a speed changing clutch, mechanism for shifting the motionchanging clutch to reverse the direction of travelof the support including tripping devices connected to move in unison with the support, mechanism for shifting the s eed changing clutch including tripping evices connected to travel in unison with the support, a spindle reversing clutch operated from the mechanism for shifting the motion changingclutch, and means for at will connecting or `disconnecting the reversing clutch with said clutch shifting mechanism.

41. A machine of the class described, hav-- ing, in combination, a rotary spi-ndle, a traveling support,44 mechanism through which motion is transmitted tothe support including a motion changing clutch and a A' ing the motion changing clutch to reversey speed changing clutch, mechanism forv shiftthe direction of travel of the supportin'cluding trippingdevices connected to move inunison v.with the support, mechanismfor shifting the speed changing clutch including tripping devices connected to travel "in unison with the support, a spindle reversing clutch operated from the mechanism for shifting the motion changing clutch,- a spindle stopping and starting clutch, and mechanism for shiftingv said latter clutch controlled from the mechanisms for shifting the motion and speed changing clutches.

42. A machine of the class described, having, in combination, a`reciprocatin/g work support, two oppositely arranged cutters mounted transversely of the support and out of alinement in the direction of travel of the support, and mechanism for rotating thedcutters to cut in the same relation to the fee 43. A machine of the class described, having, in combination, a reciprocatingwork support, a spindle extending transversely over the support, two oppositely acting cutters mounted on the spindle, and mechanism for rotating the spindle during the return of the support in a direction the reverse of that in which it is rotated during the advance of the support. J

44. A machine of the class described, having, in combination, a traveling support, two Aoppositely arranged cutters mounted transversely of the support and out of alinement with each other in the direction of travel of the support, mechanism for imparting a fast feed tothe supportduring the first part of its travel and a slow feed.

during theremainder of its travel .in each direction, and mechanism for rotating the cutters to cut in the same relation to the 45. A machine of the class described, having, in combination, a traveling support, a mechanical train through which motion is transmitted to, the support including a motion changing clutch and a speed changing clutch so arranged in the train that motion is transmitted from one clutch through the other, mechanism controlled by tripping detion-changing clutch, slow and fast speed trains driven from said clutch, a speed changing clutch for connecting eitherthe fast or the slow speed train with the support, and mechanism including tripping devices connected to move in unison with the support for shifti the clutches.

HARLES A. RICH.