US1799594A

US1799594A - Drilling machine and machine for other purposes

Info

Publication number: US1799594A
Application number: US171316A
Authority: US
Inventors: Ralph M Lovejoy
Original assignee: Individual
Current assignee: Individual
Priority date: 1927-02-26
Filing date: 1927-02-26
Publication date: 1931-04-07
Anticipated expiration: 1948-04-07

Description

April 7, 193 R. M LOVEJOY ,5

DRILLING MACHINE AND MACHTNF] FOR OTHER PURPOSES.

Filed Feb. 26, 1927 8 Sheets-Sheet 1 Fig.1. 4% 69 so as '29 L4 68' Y lnvenTor. Rulph M. Love) 0y byJMMI'W ATTYS.

April 7, 1931. R. M, LOVEJOY DRILLING MACHINE AND MACHINE FOR OTHER PURPOSES Filed Feb. 26. 1927 a Shets-Sheet 2 ln venTor. Ralph M. Lovejoy A1Tys.

April 7, 1931. I v R. M. LOVEJOY 1,799,594

DRILLING MACHINE AND MACHINE FOR OTHER PURPOSES Filed Feb. 26, 1927 8 Sheets-Sheet 3 lnve'nTor. Rqlph M. Lo vejoy yfiw April 7 193 1. R. M. LOVEJOY Y DRILLING MACHINE AND MACHINE FOR OTHER PURPOSES Filed Feb. 26,1927 8 Sheets-Sheet 4 lnVe-nTor. Ralph M. Lovej 0y byiiwdww I Anya.

A ril 7, 1931. R. M. LOVEJOY 1,799,594

DRILLING MACHINE ANDIMACHINE FOR OTHER PURPOSES Filed Feb. 26, 1927 8 Sheets-Sheet 5 l M w I w an. mm. o! q m! 1 v DH m mm um 8. 1 V fi nmfl h n n u n uwn n t. -m mm. w@ 8 m as E April 7, 1- R. M. LOVEJOY 1,799,594v

DRILLING MACHINE AND MACHINE FOR OTHER PURPOSES Filed Feb. 26, 1927 s Sheets-Sheet e Fi lZ I lnvenTo r. no Rcflph M.Lovejoy April 7, 1931.

R. M. LOVEJOY DRILLING MACHINE AND MACHINE FOR OTHER PURPOSES Filed Feb. 26. 1927 8 Sheets-Sheet 7 \nvenfor. Rcflph' M. Lovejoy AT Tys.

April 7, 1931. R. M. LOVEJOY 1,799,594

DRILLING MACHINE AND MACHINE FOR OTHER PURPOSES 8 Shets-Sheet 8 Filed Feb. 26, 1927 CNN.

Wa m

A TTys.

r work at each tool station irrespective 0 Patented Apr. 7, 1931 RALPH M. LOVEJ'OY, OF BOSTON, MASSACHUSETTS DRILLING MACHINE AND MACHINE FOR OTHER PURPOSES.

Application filed February 26, 1927. Serial No. 171,316.

This invention relates to improvements in drilling machines and machines for other purposes in which the work is carried by a travelling carrier successively to a plurality of stations at certain of which it is operated upon by a tool, such as a drill, a countersink, reainer, or other suitable tool. In usual machines of this character the travelling carrier is intermittently moved to position the work at the successive stations. Great difficulty has, however, been experienced in arresting the carrier in such a manner as accurately to position the work at each of the successive stations. An error in the correct position of the tool at one station is magmlied as the carrier progresses to following stations so that frequent adjustments of the tool or the carrier have to be made to insure the proper positioning of the work relatively to the tool. Such, adjustments necessarily consume considerable time and greatly restrict the desired output of the machine.

One of the objects of the invention is to provide means for accurately positioning fills e correct position of the travelling carrier. This is accomplished in the present invention by providing work-supporting members i which are carried by the travelling carrier,

but are movable relatively thereto and providing at each station means operable to engage and position the carrier properly irrespective of the correct position ofthe travelling carrier. g I

A further object of the invention is to provide means for locking the work-supporting member in its proper position at each station, such means desirably being conjointly operable with the positioning means.

A further object of the invention is to provide means for simultaneously positioning and locking all of the work-supporting members properly at the respective stations to which they are successively moved.

Another object of the invention is to provide means for adjusting the tool carriers for the respective tools relatively to the positioned work so that when the work has been initially positioned with respect to the first of the successive tools of the machine the remaining tools can be accurately adjusted relatively to the work after the work-supporting member has been positioned at such tool station. When, therefore, the work is positioned accurately with respect to the first tool 85 and the remaining tools have been positioned properly with respect to the work, other pieces of work, wh1ch are subsequently positioned properly with respect to the first tool, will necessarily be properly positioned with respect to the remaining tools, and the accuracy of the action of all tools continuous] maintained without necessity of further ad justment. I

A further object of the invention is to provide novel stop mechanism for arresting the movement of the travelling carrier and act-' ing during its arresting movement to release or disengage the mechanism which actuates the travelling carrier.

A further object of the invention is to provide means automatically operable in conjunction with-the positioning means for the work-supporting members to release the means for arresting the travelling carrier I and position the same in readiness again to arrest the carrier upon subsequent movement thereof,

A further-*pbject of the invention is to provide controlling mechanism operable by a selected tool when the latter has reached a predetermined position relatively to the work to arrest the tool-feeding mechanism, to release the positioning and locking mechanism for the work-supporting members, and to cause the actuation of the mechanism for moving the travelling carrier.

A further object of the invention is to provide controlling mechanism comprising a medium operable when energized to cause v the actuation of mechanisms for positioning and acting upon the work and operable when de-energized to arrest the operation of such mechanisms and to bring into operation other mechanisms for advancing the work to the next succeeding station. Preferably hydraulic means are employed for aocomplishing thispurpose. It will, however, be understood that other mediums may be used, such as gaseous fluid under pressure, or

suitable mechanism 0 erable by electricity.

Other objects and eatures of the invention will more fully appear from the following description and the accompanyin drawings and will be particularly pointed? out in the claims.

In the drawings:

Fig. 1 'is a general view, partially in diarammatic form, of a drill embodying the invention, a single drilling unit being shown, this figure being more particularly illus trative of the controlling mechanism;

Fig. 2 is a view, partially, in elevation and artially in vertica section, of the base, the rotatable table which carries a series of work-supporting members, a portion of the central column, and parts of the drilling mechanism;

Fig. -3 is a broken horizontal sectional view of the rotatable carrier, illustrating particularly the table-arresting mechanism shown in the position in which the table is stopped;

Fig. 4 is a detail sectional view illustrating the table-arresting mechanism removed from locking position;

Fig. 5 is a detail, broken vertical sectional view illustrating the relation of the tablearresting mechanism to the table-rotating ear;

g Fig. 6 is a detail view illustrating a portion of the table-arresting mechanismwhich is operated by the table-arresting'movement thereof to release the table-driving mechamsm' Fig. 7 is a detail plan view of a portion of the rotating table with the work-supporting members mounted thereupon and broken away to illustrate the mechanism for positionmg and locking one of the work-supporting members accurately;

Fig. 8 is a vertical sectional view illustrating particularly the hydraulically operated positioning and locking mechanism for a work-supporting member;

Fig. 9 is a detail view on line 9-9 Fig. 8; Fig. 10 is a view, mainly in vertical section, of the driving mechanism for feeding the tools;

Fig. 11 is an enlarged sectional detail view of the clutch and brake forming part of the tool-feeding mechanism;

Fig. 12 is a detail view, mainly in vertical section, of the actuatin mechanism for intermittently rotating the work-supporting table;

Fig. 13 is an enlarged View, mainly in vertical horizontal section, of the clutch mechanism illustrated in Fig. 12;

Fig. 14 is a view, partially in horizontal section and mainly in plan, illustrating the tool-supporting bracket frame and tool carrier and the cam mechanism for feeding the tools; and,

Fig. 15 is a detailview of a horizontally plementary positioned tool carrier and tool and the mechanism for actuating the same.

The preferred embodiment of the invention, which is illustrated herein as applied to a drilling machine for performing a series of operations upon a work piece, comprises a heavy hollow base 1, providing a reservoir for oil, or other suitable fluid, which suports a travelling carrier in the form of a rotatable table 2 which carries a plurality of independent work-supporting members 3, preferably in the form of flat sectors which rest upon the table 2 and are movably relatively thereto, with positioning means 4 mounted upon said base at each tool station operable to position and preferably lock the sectors accurately in predetermined positions at its tool station irrespective of the correct position of the travelling carrier.

A hollow central column 5, which is mounted upon and rises from the base, carries a series of brackets, preferably comprising pairs of arms 6 which are spaced apart and each of which is provided with a two-part annular clamp comprising internally grooved

members

7 and 8, in which are seated rings which also engage grooves 9 in the periphery of the column. The outer ends of the arms 6 are connected by a hollow vertical post 10. A tool-carrying frame is adjustably connected to the bracket 6 in such a manner that it may be adjusted relatively to the bracket.

In the construction illustrated the carrying frame comprises a vertical guide bar 11 having arms 12 provided with semi-circular recesses which engage the post 10 and complementary semi-circular members 13 which clamp the members 12 upon the post 10 so that the tool-carrying frame can be ad justed about the vertical axis of the post 10. The tool-carrying frame preferably is provided with a laterally flanged vertical dovetail guide 15 which is engaged by comdovetail grooves upon a tool carrier 16, the dovetail groove being formed by complementary ribs upon the tool carrier, one of which ribs 16a is adapted to be clamped against the dovetail 15 to permit a vertical adjustment of the tool carrier upon the frame. The tool slide 17 is reciprocably mounted in the tool carrier" and is provided with a laterally extending lug having upon it a cam follower roller 18 which is engaged by a feeding cam 19 which is rotatably mounted upon a stud 2O projecting from the wall of the tool carrier. The tool-feeding cam 19 is connected to a worm gear 21, (see Fig. 10) which engages a worm 22 upon a vertical shaft 23 which is actuated by the shaft 24 of an electric motor 25 through suitable mechanism including a hydraulic clutch contained in a casing 26 (see Fig. 12) which will hereinafter be more fully described. A brake, contained in a casing 27 also is provided actoolmagnet curately to arrest the feeding mechanism with the cam in a predetermined position.

lhe rotating table is actuated by the shaft 28 of an electric motor 29 through a mechanically actuated and hydraulically controlled clutch mechanism contained in a casing 30, which will hereinafter be more fully described, to rotate a shaft 31 having upon its inner end a beveled pinion 32 which enages a beveled gear 33 upon a shaft 34 which downwardly through the cen- (see Figs. 2 and 12), and is provided at its lower end with a beveled pinion 35 which engages a complementary inion 36 upon an adjustable countershaft 37 having at its opposite end a pinion 38 which engages a complementary pinion 39 upon a vertical shaft 40 having at its upper end a pinion 41 which engages an annular gear 42 which is fixedly secured to a downwardly extending flange 43 integral with the rotating table.

Suitable stop mechanism is provided for arresting the rotation of the table 2 and which stop mechanism desirabl is provided with means operable during its table-arresting movement to release the clutch of the tableactuating mechanism. One of the principal features of the invention comprises the employment of a operable extends axially tral column 5 controlling medium when energized to control certain of the mechanisms above described, to cause the actuation of the work-support clamping mechanism and the tool-feeding mechanism and to release the clutch of the table-actuating mechanism, and when de-energized-to release the work positioning mechanism, to release and arrest the tool-feeding mechanism and to cause the actuation of the table-actuating mechanism.

In the embodiment of the invention disclosed herein the medium employed is a circulating fluid, such as oil, having means to arrest the circulation of the fluid and energize the same by building up pressure in the conduits for such fluid with means for releasing the pressure, thereby de-energizing the fluid.

' In the preferred construction disclosed herein a body of oil is contained in a reservoir within the hollow base 1 and is drawn therefrom through a suitable screen or filter 44, and pipe 45 to a pump 46 which is driven by a motor 47 The delivery or pressure conduit 48 leads from the motor 46 into a housing 49, which preferably is mounted upon the upper end of the hollow central column 5 and from which housing the'oil flows downwardly through the central column into the reservoir. The conduit 48 is provided within the housing 49 with a restricted end portion forming a valve seat 50 which is adapted to be engaged by a valve 51, the stem of which is secured to an arm 52, (see Fig. 10) of a rock shaft 53 extending transversely across said housing. A helical spring 54, surrounding the valve stem, seat the valve 51. The outer end of the rock shaft 53 is provided with an arm 55 which is connected by a link 56 to one arm of a bell crank lever 57, the other arm of which is connected to a link having at its lower end a hook complementary hook 59 which is pivotally connected to a lever 60 fulcrumed at one end upon a suitable pivot 61 and provided at its other end with an inclined or cam face 62 adapted to be engaged by a pin 63 upon one of the tool-feeding cams 19 and operable when so engaged to actuate the bell crank lever 57, and through the link 56 and the rock shaft 53 and arm 52, to remove the valve 51 from its seat and thereby release the pressure in. the delivery or pressure pipe, thus rendering the machine inoperative as illustrated in Fig. 1. At this time a work piece may be placed upon a work-supporting member at one of the stations. When it is desired to start the machine the hook 58 is disengaged from the book 59, thus permitting the spring, 54 to close the valve 51, thereby causing pressure to be built up in the pressure or delivery pipe 48.

Suitable pipes lead from the delivery or pressure conduit 48 for the oil to the various actuating and arresting mechanisms above described. One of these pipes 64 leads from the pressure conduit 48 to the chambers 65 of the various hydraulically operated devices for accurately positioning the work-supporting members. A branch 66 from the pipe 64 leads to the chamber of an hydraulically operated device 67 for releasing and positioning a table-arresting mechanism. Another pipe 68 leads from the pipe 48 to the hydraulically operable clutch and brake which controls the other branch 69 leads from the pressure pipe 48 to the chamber 70 of hydraulic means for retaining the clutch of the table-driving mechanism in released position during the actuation of the tool-feeding mechanism.

Upon the starting of the feeding mechanism the feeding cam 19 is rotated, thus releasing the engagement of the pin 63 with the cam 62 upon the lever 60. A suitable spring 71, which is connected to the lever 60, thereupon raises the lever 60 and positions the book 59 above and out of engagement with the hook 58 until the lever 60 is again actuated by the pin upon the cam 63 upon the completion of the rotation of the feeding cam, 19. By virtue of this hydraulic controlling mechanism the entire operation of the machine is automatically controlled except for the disengagement of the

hooks

58 and 59 which is required to initiate the action ofthe hydraulic controlling mechanism, or in other words to start the machine.

normally tends to 58 adapted to be engaged by a feeding mechanism. An-

g mechanisms to be assembled therein to :u-tuating niechanisn'i.

will of course, be understood other s n'u-n'maily operable contro mg nnty be employed; that other mediums, such as, compressed air or sf 2am may 5 he used instead of oil, or other liquid, and

that usual electrically operated mechanisms can be substituted for the fluid-controlled mechanisms herein described within the "if the present invention.

inc thus generally described the op- "at on of the drilling machine, the particuconstruction of the machine and the dea of the mechanisms illustrated will be llS The base l. is of general cylindrical form and is hollow, but is provided with suitable manholes to permit access to enable the The upper portion of the base is provided with a preferably integral annular ring 72 which is surfaced at its upper edge to provide a seat for the thickened periphery of the rotatable table which desirably has an apron extending downwardly around the ring 72 to prevent dust, chips, etc., from entering between the contacting surfaces of the table and ring. The base also desirably is provided with a flange 78 which extends around the depending flange of the table. The central portion of the base is provided with an upwardly extending, preferably integral, boss'fll which is provided with a finished cylindrical surface which is engaged by a complementary cylindrical finished surface upon a flange 75 depending from the table 2. The upper end 7 6 of the boss 74 is flat and has secured to it a plate 7 7 which is provided with an accurately 40 finished cylindrical periphery 7 8 adapted to be engaged by complementary finished sur- ,faces upon the inner ends of the work-sup porting members or sectors 3. A circular plate 79 rests upon the plate 77 and is of larger diameter than that of the plate 77 so that it extends over the periphery thereof and thus overlies the inner ends of the work supporting sectors 3.

A hollow bearing housing comprising a flange 80. which rests upon theplate 79, and

a cylindrical portion 81, which extends downwardly through the cylindrical central apertures in the plates 79 and T7 and the head 76 of the boss 74, is provided with a downward- 5' ly tapering portion having a series of ports cmnminiicating with the reservoir in the base and a lower cylindrical portion having a screw threaded periphery which carries the casing for the

pinions

35 and 86 of the table The column 5 rests upon the flange 80 of this hollow bearing housing and suitable bolls, extending down- '\v'ardly through a flange upon the lower end of the column the flange 80, the

plates

59 and 7? into the boss 74 of the base serve to secure the same firmly together. The hearing housing desirably is provided at its upper end with a transverse spider 82 having a boss forming a bearing for the vertical shaft 34 and the lower cylindrical end of the bolls ing hearing may also be provided with a bushing for the shaft 34.

The lower wall 83 of the head of the base is provided with a recess to receive an adjustable bearing support 84 upon which a twopart housing 85, which encloses the

gears

38 and 39, is suspended and is rotatably adjustable, thus enabling the position of the shaft 40 of the table-drivin pinion 41 to be properly assembled and a justed if necessary.

The base desirably also contains the stop mechanism and the mechanism for positioning the work-supporting members accurately at the several stations.

The positioning mechanism for the worksupporting members The positioning mechanism for the work supporting members is particularly illustrated in Figs. 7, 8 and 9 of the drawings and comprises co-operating members mounted respectively upon the sectors and upon the base at the several tool stations with hydraulic means for actuatin the members Which are mounted upon the fiase to cause the same to engage, position and lock the sectors accurately in predetermined position at the several stations. By providing individual locking mechanisms of this character at each station absolute accuracy in the positioning of the worlcsupporting members at the respective stations is assured. Inasmuch as all of the locking mechanisms at the several stations are identical the description of one will be sufficient for all.

The preferred form of locking mechanism illustrated in Figs. 7, 8 and 9 comprises a block 86 which is bolted to the under face of the work-supporting sector 3 and extends downwardly through a suitable aperture in the rotating table 2. This block is provided with a re-entrant recess 87 the under face of which presents a V-shaped downwardly and outwardly inclined groove 88. The complementary member comprises a vertically reciprocable clamping slide or positioning plunger 89 having a laterally projecting nose 90, the under face of which is provided with downwardly inclined faces 91 complementary to the walls of the V-shaped groove 88. The vertically reciprocable clamping slide or positioning plunger 89 is mounted in suitable ways in a bearing 92 having a curved peripheral surface complementary to the inner face of the ring 72 which extends upwardly from the base. The bearing 92 is secured to the ring by suitable bolts extending through slots and flanges in the bearing. Preferably adjusting screws 93, mounted in suitable bosses which are secured to the ring 72 and which engage at their ends the opposite sides of the bearing 92, are provided in orderto enable theposition of the bearing 92 and consequently the position of the vertically reciprocable clamping slide or positioning plunger 89 to be accurately adjusted.

' The lower end of the clamping slide 89 is connected to a piston 94 which is recipro cably mountedin the cylindrical portion of an oil-containing chamber 65. A spring 95 between the piston 94: and the head of the casing serves normally to raise the piston and the clampin slide, thus removing the nose 90 thereof from engagement with the walls of the recess 88. The pipe 64 from the pressure pipe of the hydraulic controlling s stem communicates with the oil-containing chamber 65-as heretofore described. When, therefore, pressure is established in the pressure pipe 48 by the closing of the valve 51,

liquid is forced through the pipe 64 into the chamber 65, thereby depressing the piston 94 and causing the inclined faces 91 of the nose 90 of the slide 89 to engage the walls of the recess 88 in the block 86, thereby forcing the sector radially inwardly and causing its finished inner edge to engage the complementary finished edge 78 of the plate 77. The engagement of these complementary inclined members serves not only to force the sector inwardly, but also to prevent lateral movement of the sector, and also to lock the sector tightly down upon the rotating table, thus insuring the accurate positioning of the sector irrespective of the correct position of the rotating table as the work-supporting sector is movable relatively to the table.

In order to retain the sectors upon the table in approximately the proper position each sector is provided adjacent its edge with an inclined slot 96 through which a bolt 97 extends into the table 2, a spring 98 desirably being interposed between the head of the bolt and the countersink in the sector.

The table-actuating mechanism The travelling work-carrying member, which is illustrated herein as in the form of I a rotatable table, is provided with a ring 42 which is driven by a gear 41 through a shaft 40, beveled pinions 39 and 38, countershaft 37, beveled pinions 36 and 35 from the shaft 34 which extends axially through the central column, and is provided at its upper end with a beveled gear 33 driven by a pinion 32 upon a shaft 31 which in turn is driven from the shaft 28 of the motor 29 as heretofore described. Reducing gears and the clutch mechanisms are, however, provided for controlling the actuation of the table.

In the construction illustrated the shaft 28 is connected by a universal 'oint 99 to an axially alined shaft 100 whic is mounted in a suitable bearing in the casin 30 and has secured to it by pins the hub o a clutch member 101. An axially alined shaft 102, which is mounted at one end in a boss within the casing and at its opposite end in the hub of the clutch member 101, has slidably secured to it by a feather, or otherwise, a sliding clutch member 103 having faces complementary to the faces of the clutch memher 101. A helical spring 10 1, interposed between the hub ofthe clutch member 103 and the bearing of the shaft 102, tends normally to force the

clutch members

103 and 1 101 into engagement. A clutch-shifting lever 105 has one arm connected to agsrock shaft 106 extending transversely of the'casing, the other arm 107 ofthe lever being adapted to be engaged by a stop 108 mounted upon the wall of the casing. The rock shaft, 106 is also provided with an arm 109 which is connected by a link 110 to a member of the stop mechanism which will hereinafter be de scribed.

ment. between the

clutch members

103 and 101 so that the hydraulically operated mechanlsm just described functions to retain these clutch members in inoperative posi- 7 tion during the actuation of the drilling mechanism.

The end of the shaft 102 is provided with a pinion 112 which engages a gear 113 upon the shaft 31 and the shaft 31 preferably is formed in two sections which are connected by a universal coupling 114.

The table stop mechanism The ring gear42, which is secured to the downwardly extendingflange 43 of the table,

has a plain annular ortion beneath the toothed portion thereo and to this annular portion are secured a series of shouldere'd' members 115 corresponding to the positions at which the table shall be arrested with the work-supporting members positioned at the respective stations. These shouldered members are adapted to be engaged by a suitable stop to arr-est the table in approximately the positions required for the work-supporting members at the respective tool stations.

nasmuch as the rotating table, the work supports and work are of great weight and when under motion acquire considerable momentum, it is desirable that means shall be provided for cushioning the stoppage of the table, thereby preventing undue ]ar and avoiding the likelihood of overthrow, or rebound, which might occur by the sudden stoppage of the table. In the present construction a reciprocating and sliding stop or latch 116 is provided which has a shouldered end 117 adapted to be positioned in the path of the shouldered members 115 on the driving gear of the table. The stop member or latch 116 is provided at its opposite end with a slot which is traversed by a pin 118 which is pivotally mounted upon a bracket 119 secured to the lower wall 83 of the head of the base 1. A helical spring 120, seated in a cylindrical longitudinal bore in the stop 116 and abutting atone end against the pin 118 and at its opposite end against the end of the slot, tends normally to force the stop 116 away from its pivotal support into position to engage the shouldere members 115. A link 121 is pivotally connected at one end to the stop 116 and at its opposite end to the stem 122 of a piston 123 which is slidably mounted in a chamber 124 which is securely bolted to the wall 83 of the base. The

branch pipe 66 from the pipe 64 communicates with the chamber 124 and desirably a valve 125 is located in this pipe in order that the flow of liquid from the chamber may be controlled for purposes which will hereinafter ap ar.

The piston 123 is provided also with an other stem 126 which passes through'the opposite end of the chamber and isconneeted y links 127 to the vertical arm 128 of a rock shaft 129 which is journalled in a suitable bearing 130 in the vertical wall of the base and extends therethrough and is provided externally of the base with an arm 131 which is connected to the link 110 which extends upwardly therefrom and is connected at its upper end to the arm 109 of the rock shaft 106 of the lever which actuates the movable clutch member 103 of the tableactuatin mechanism. The stop 116 is also provide with a laterally extending arm 132 which is engaged by a plunger 133 reciprocabl mounted in the chamber 67 into which liquid under pressure is conducted by the branch pipe 66 from the pipe 64, leading from the pressure-pipe 48.

In Fig. 3 of the drawings the stop mechanism is illustrated in the position in which the table is arrested. In Fig. 4 the stop is illustrated as released from the shouldered member 115 of the table. The operation of the actuating and stop mechanisms is as follows: In Fig. 12 the

clutch members

103 and 101 are shown as in engagement. At this time pressure has been released from the hydraulic controlling mechanism and the spring 104 has forced the movable clutch member 103 into engagement with the clutch member 101, thereby enabling the motor 28 to rotate the table through the shafts and trains of gears heretofore described. 'When the table has been rotated until the shouldered member 115 engages the complementary shoulder 117 of the stop 116, the stop 116 is moved laterally, to the left, to the position illustrated in Fig. 3. This swinging movement of the stop mechanism 116 forces the piston 123 inwardly against the oil which is contained in the chamber 124, thus forcing the oil through the aperture in the valve 125 and thereby cushioning the stoppage of the table. By adjusting the valve 125 any desired resistance may be imposed upon the stop mechanism, As the piston is forced inwardly the piston stem 126 moves to the left thereby rocking the shaft 129 and causing the arm 131 thereof to depress the link 110. This depression of the link swings the arm 109 of the rock shaft 106 downwardly thereby rocking the lever 105 laterally and causing disengagement of the clutch member 103 with the complementary clutch member, 101, thus disconnecting the driving mechanism for the table simultaneously with the stoppage of the table.

When the book 58 is disengaged from the hook 59 and the valve 51 thereby seated and pressure in the hydraulic controlling system established, such pressure immediately actuates the sector positioning and locking mechanism, thus retaining these sectors accurately positioned. At the same time pressure, which is transmitted through the pipe 66 to the chamber 67 actuates the plunger 133 and causes it to move the stop 116 bodily against the action of the spring 120 and to disengagesaid. stop from the shouldered member 115. At substantially the same time pressure entering from the branch pipe 66 through the restricted orifice in the valve 125 into the chamber 124 causes the piston 123 to be moved laterally to the right, thereby swinging the stop 116 about its pivotal support until the end of the stop overlies the shouldered member as illustrated in Fig. 4, so that upon release of the pressure in the chamber 67 the spring will force the step 116 longitudinally into engagement with the periphery of the gear ring and into the path of the next shouldered member 115 upon said ring. At the same time the pressure introduced into the chamber 70 of the clutch-actuating mechanism forces the plunger 111 outwardly and causes it to engage the arm 107 of the clutch-actuating lever which has been previously moved by the stop mechanism, as heretofore described, and holds the lever 107 in engagement with the stop 108 so long as pressure is maintained in the hydraulic controlling system which, therefore, continues until the valve 51 is unseated by the actuation of the hookmechanism by the engagement of the pin 63 upon a tool-feeding cam, with the cam surface 62 of the lever 60, which causes engagement of the hook 58 and actuation of the mechanism for unseating the valve 51.

Tool-supporting actuating and feeding mechanism 7 tool carrier 16 which is adjustably clamped by a rib 16a upon the dovetail guide 15 of a tool-carrying frame, the arms 12 of which embrace a vertical hollow post 10 of a bracket having arms 6 provided with internally ribbed

clamping members

7 and 8 which embrace the central column. The arms 12 of the tool-carrying frame are provided with laterally extending flanges which engage complementary flanges upon the arm 6 and are clamped upon the hollow post 10 by bolts 134. These bolts can be released to permit the tool carrier to be swung about the axis of the post as a center, thus adjusting the tool circumferentially, and also radially, with respect to 'the axis of the central column. The internally grooved

members

7 and 8 of the bracket likewise are clamped together by bolts 135 which may be released to permit the rotation of the arms about the column and then set up to retain the brackets firmly in ,-position. By virtue of these two adjustments the tool can be positioned properly with respect to the work carried by the accurately positioned worksupporting members.

The tool carrier 16 has secured to it a bracket 136 (Fig. 10) whichextends laterally and upwardly and supports upon its upper end a housing 137 having bearings for the vertical worm shaft 23, the upper end of which is provided with a beveled gear 138 which meshes with a beveled pinion 1239 upon the shaft 140 which is provided with a universal joint 141 which connects it to an axially alined shaft 142 which is journalled in bosses in a housing 143 which is mounted upon and secured to the flanged upper end of the column 5.' The shaft 142 has upon its end a beveled-pinion 144 which engages a beveled gear'145 which is rotatably mounted upon the shaft 31 of the table-actuating mechanism. 'A beveled pinion 146, upon the end of a shaft 147 which is journalled in a boss in the housing 143, engages the beveled gear 145. The shaft 147 has upon its opposite end a gear 148 which is engaged and actuated by a pinion 149 upon a short shaft 150 whichis inaxial alinement with the shaft 24 of the feed-actuating motor 25. An hydraulically operable clutch mechanism is interposed between the motor shaft 24 and the shaft 150. Ireferably also a universal ]O1Ilt 151 is interposed between sections of the shaft 24.

The hydraulically operated clutch, which is illustrated in Fig. 10 and in enlarged detail in Fig. 11, is contained in the housing 26 which is supported upon ,a bracket 152 mounted upon the central column 5. The housing 26 is provided at one side with an enlarged cylindrical boss 153 in which the section 154 of the shaft 24 is journalled, a suitable bushing being provided between the shaft and the internal wall of the boss 153. The section 154 of the shaft is drilled axially to provide a duct 155 and'is also provided with a circumferential groove 156 provided with ports communicating. with the axial duct 155 and through which oil, or other fluidunde'r pressure, may be introduced from the pressurepipe 48 through the pipe 68. The axially drilled duct 155 is provided with a branch 158 which communicates with a chamber of a cylinder 159 having a central boss which is pinned to the shaft 154. This cylinder 159 is provided at its opposite end with a laterally extending flange which is bolted to a head 160 having a cylindrical hub 161 which is journalled in a suitable bearing in an extension or boss 162 of the housing 26. The hub 163 of a clutch member 164 is pinned to the shaft 150 and is rotatably mounted within the hub 161 of the head 160 of the cylinder. The complementary clutch member 165 is slidably mounted upon the shaft 154 and is provided with a spherically curved central portion 166 which seats upon a complementary cylindrical socket in the hub of a piston 167 which is slidably mounted in the cylinder 159. A retaining member 168, having a central aperture embracing the hub of the piston, is secured in the cylinder by Lvi tending from the piston through suitable holes in the retaining member, prevent relative rotation therebetween. Helical springs 170, seated at their ends respectively in sockets in the retaining member; and the piston, normally tend to force the piston rearwardly and to release the engagement of the clutch members. When, however, fluid under pressure is introduced from the pressure pipe 48 through the pipe 68 and duct 155 into the chamber of the cylinder, the piston is forced against the pressure of the springs 170, (to the left as illustrated) and thereby causes the clutch face 165 positively to engage the clutch face 164, thereby imparting rotation to the shaft 150. The rotation of this shaft causes the pinion 149 to rotate the gear 148 and shaft 147. The rotation of this shaft, acting mechanism is provided. This braking mechanism is carried by a two-part housing 171 which is mounted upon a flange upon the end of the extension 162 of the clutch housing 26. The braking mechanism comprises an abutment member 172 which is interposed between the gear 149 and a head 17 3 upon the extension 162 of the clutch housing and a brake member 17 4 which is fixedly secured upon and keyed to the end of the shaft 150. A complementary braking member 175, of generalbell-shape in form, engages the braking member 174.. The braking member 175 has a hub which is slidably mounted upon a stud 176 having at its inner end an enlarged head 177 which engages the inner wall of the bell-shaped member and which is reciprocably mounted in a boss 178 extendin inwardly from the vertical wall 179 o the housing 171. One or more pins 180, seated in the wall 179 and extending through holes in a flange of the hell-shaped brake member, prevent rotation of the brake member. A helical spring 181, surrounding the bearing of the stud 176, and abutting at its ends against the wall 179 of the casing and the bell-shaped clutch member, tends normally to force the clutch members into engagement. The end of the stud 176 is fixedly secured to a hollow piston 182 which is reciprocably' mounted in a cylinder 183 having flanges by which it is secured rigidly to the vertical wall 179 of the housing 171. The vertical wall of the housing 179 is provided with a duct 184 which communicates with the chambered piston and cylinder, and fluid under pressure is supplied thereto through a branch pipe 185 which communicates with thepipe 68 which supplies fluid under pressure to the hydraulic clutch of the feeding mechanism.

In the operation of the machine, therefore, when the valve 51 has been closed by manually releasing the

hooks

58 and 59 of the starting mechanism, fluid under pressure is forced through the pipe 68 into the chamber of the cylinder 159, thereby forcin the clutch member 165 into engagement wit 1 the clutch member 154, thus connecting the

shaft

153 and 150, and causing the actuation of the feeding mechanism. At the same time fluid under pressure is forced through the branch pipe 185 and duct 184 into the chamber of the piston 182 of the cylinder 183, thereby forcing the piston outwardly, (to the left), thus disengaging the brake member 175 from the complementary. brake member 174. Upon the completion of a complete revolution of the feeding cam and the engagement of the

hooks

59 and 58, and consequent release of the valve 51, the pressure in the hydraulic system is immediately released, sothat the springs 170 of the feeding clutch separate the

clutch members

164 and 165. The release of pressure of the fluid in the branch pipe 185, which simultaneously octhe tool slide 17 An anti-friction bearing,

such as a ball bearing 189. is interposed between the end of the tool slide and the chuck 187. The tool shaft may be driven in any suitable manner, preferably by an electric motor 190 supported upon a suitable bracket extending from the central post. In such case the shaft 188 desirably is slidably mounted in a hollow shaft of the armature of the motor and connected thereto by a feather, or other suitable means, which will prevent relative rotation between the armature shaft and the shaft 188.

The tool-feeding mechanism heretofore described, comprises a cam which, acting upon the cam follower 18, forces the tool side downwardly to cause the tool to enter the work. Preferably this cam is provided with a sharply recessed portion to permit the raising of the tool. Any convenient means may be provided for holding the cam follower in engagement with the cam face. A convenient means which is illustrated herein comprises a cable 191 which passes over

suitable guides

192 and 193 and is connected at its opposite end to a weight 194 slidably mounted within the hollow post 10 of the bracket which is carried by the central post.

The particular mechanism for actuating one of the tools, which has been described, is, of course, applicable to all of the tools of the series, each of the tools bein actuated through a shaft 147 extending radially from the housing 143 upon the central post. Any desirable number of tools and work supports may be employed as can be conveniently assembled upon the column together with a corresponding number of work-supporting members mounted upon the rotatable table.

In place of having a supporting bracket for each tool complementary members like the member 6 may be employed and clamped together upon the central post so that a pair of diametricallv opposite tools are carried by the same bracket. By such construction a greater number of tools can be conveniently mounted upon the central post than otherwise.

The hydraulic pump 46 may be of a capacity to maintain a large amount of liquid in circulation and H suitable ports are, of course, provided the top and bottom walls of the gear casing, which is secured to the upper end of the column, to permit the oil to return freely into the reservoir. The pipe 48 desirably also is provided with an air dome 195 adapted to prevent breakage of the pipe in the event of excessive pressure and such leakage ports may be provided in the clutch mechanisms as may be desirable to prevent undue pressure therein.

While the mechanism above described relates to vertically operable tools, it will be readily understood that suitable mechanism may be employed for actuating a

horizontal p p members

165 and 164, thus causing the feedtool, or one positioned in other relations to the work. Such a mechanism is illustrated in Fig. 15 of the drawings which shows a bracket 196 extending radially from the wall 73 of the base and upon which is mounted the base 197 of a horizontal tool carrier. The base 197 is provided with upwardly extending bosses 198 connected by a shaft 199 which is fixedly secured to such bosses and upon which are clamped arms 200 of a tool-carrying frame 201 having a dovetail guide 202 which is engaged b dovetail grooves upon a tool carrier 203. Sue of the flanges of the tool carrier which embraces the dovetail ide 202 is adjustable in the manner described with reference tothe tool carrier 16a to enable the tool carrier to be positioned toward and from the work. A tool slide 204 is reciprocably mounted in the toolcarrier and is provided with a follower roller 205 which engages a tool-feeding cam 206 in the manner heretofore described. The tool cam 206 has secured to it a worm gear 207 which is engaged by a worm 208 upon a vertical shaft 209 which is journalled at its upper end in a suitable bearing in a gear casing 210 which is supported by a bracket 2111mounted upon the bracket 136.

In this construction the shaft 140 is extended through the housing 139 and is provided with an additional universal and sliding joint connection 212 in order to ermit the vertical drilling tool to be operate without interfering with the operation of the horizontal tool. In the construction illustrated the drill 213 is carried by a chuck 214 upon the drill spindle 215 which is directly driven b a motor 216 in the manner aforesaid. T e motor 216 is mounted upon an extension 217 of the tool carrier. A cable 218,

connected at one end to the tool slide 204, and passing over a guide roller 219, and having a weight 220 at its opposite end, serves to maintain the follower 205 of the tool slide in engagement with the tool-feedin cam 206 in the manner aforesaid. A suita le centering guide 221 for the drill 213 desirably is bolted to the base 197 of the tool carrier. Similar centering guides 222 for-the vertical tools desirably also are mounted upon the plate 79.

In the operation of the machine,assuming that the mechanisms are at rest in the positions illustrated in the principal figures of the drawings, and that the electric current has been turned on to actuate all of the permits the spring 53 to close the valve 51 in the delivery or ressure pipe 48 leading from the pump, t us establishing pressure throughout the entire hydraulic controlling system. This pressure, acting through the i e 68, causes engagement of the clutch actuating motor 25 to drive the shaft 147 and the pinion 146 upon that shaft to rotate the gear 145 in .the casing at the upper end of the motors, the operator starts the machine by column, thereby driving all .of the other shafts which extend radially from said casing and mesh with the gear 145; thus all worm shafts 153 are simultaneously rotated and the feeding cams caused to rotate and thereby to advance the tool. slides. At the same time the pressure established in the hydraulic controlling s stem acts through the pipe 64 to force the p unger 89 of the locking mechanism downwardly, and to lock the sectors accurately in place. It also actuates the plunger 133 of thestop mechanism to release the engagement of the stop 116 with the shouldered members 115 upon the rotating table and-to reposition the stop member in the position illustrated in Fig. 4. All the tools are, therefore, 'fed into the work.

At the completion of the rotation of the cams, which actuate the tools, and upon one of which the pin 63 is mounted, the pin 63 engages the cam face 62 of the lever 60, thereby depressing the hook 59, causing its engagement with the hook 58 and acting through the bell crank lever 57 to open the valve 51 in the pressure system. Immediately upon the release of the ressure the feedingactuating mechanism 18 released and the brake applied thereto. The cam at this time has passed beyond its high point 'so that the tools are raised by the weights which are attached to them. The release of the pressure in the system also permits the spring of the workcarrying sector locking mechanism to release the positioning and locking device for the sectors and thereupon also releases the pressure upon the plunger 111 which has retained the

clutch members

103 and 101 of the tableactuating mechanism out of engagement. The spring 104 of this clutch member thereupon forces the clutch memberstogether and causes the rotation of the table. When the Y shouldered members 115 upon the gear ring of the table enga e the sto 116, the stop 116 is forced lateral y, thus orcing the piston 123 inwardly against the fluid in the chamber 124, thereby gradually arresting the rotation of-the table. This movement of the plunger, acting through the rod 126, actuates the

rock shaft arms

128, 129, and depresses the vertical iao link 110 which, acting through the arm 109 of the rock shaft 110 and the clutch-actuating lever 105, releases the clutch member 103 from the clutch member 101 and permits the sto page of the machine.

n order to adjust the position of stoppage of the machine the link 110 desirably is provided with a turnbuckle by means of which the length of the link can be properly ad-z justed. I

It will be understood that the particular embodiment 'of the invention described herein is of an illustrative character and that various changes in form, arrangement and construction of parts may be made within the spirit and $00 e of the invention.

It will also e understood that whereas the invention has been described as appliedto a drilling machine, the whole, or various features of the invention may be employed in connection with machines Y for performing other operations than drilling and boring operations.

It will also be understood that the special mechanisms herein described, such as those for positioning the Work-supporting members, those for arrestin the rotation of the travelling carrier, which is specifically illustrated as the rotating table, and the mechanisms forco-ordinatin the action of the stop mechanism with the riving mechanism for the travelling carrier, the mechanisms for feeding the tools, and the controlling mecha nism, which is operable by means of an enerized medium, may be embodied individualy, or otherwise, in any type of machine to which they may be applicable within the spirit and scope of the invention as defined in the claims.

Having thus described the invention, What is claimed as new, and desired to be secured by Letters Patent, is:

1. In a machine of the class described comprising a movable work carrier, a Work-supporting member slidably mounted upon and movable relatively to said carrier, means for intermittently actuating said carrier to move the Work-supporting member to a predetermined tool station and means operable simul-- ally with respect to the radial movement at its station irrespective of the correct position of the carrier.

3. In a machine of the class described comprising a movable WOI'k carrier, a work-supporting member carried thereby and movable relatively thereto, means for intermittently actuating said carrier to move the work-supporting member successively to a plurality of tool stations, means at each station operable to position the work-supporting member accurately at its station irrespective of the correct position of the carrier and means for locking the positioned Work-supporting member against displacement.

4, In a machine of the class described comprising a movable carrier, a plurality of work-supporting members carried thereby and movable relatively thereto, means for intermittently actuating said carrier to move said work-supporting member successively to a plurality of tool stations and means at each station operable to position the work-supporting member accurately at its station irrespective of the correct position of the carrier and operable also to lock the work-support ing member against displacement.

In a mac ine of the class'described comprising a movable carrier, a plurality of work-supporting members carried thereby and movable relatively thereto, means for intermittently actuating said carrier to move said Work-supporting member successively to a plurality of tool stations, means at each station operable to position the Work-supporting member accurately'at its station irrespective of the correct position of the car- .rier and operable also to lock the Work-supporting member against displacement and means for simultaneously actuating all of said positioning and locking means.

6. In a machme of the class described comprising a movable carrier, a plurality of work-supporting members carried thereby and movable relatively thereto, means for intermittently actuating said carrier to move said work-supporting member successively to a plurality 0 tool stations, meansat each station operable to position the work-supporting member accurately at its station irrespective of the correct position of the carrier and operable also to lock the work-sup-" porting member against displacement and hydraulically operable means for simultaneously' actuating each of said positioning and locking means.

7. In a machine of the class described, a

base, a movable carrier, a work-supporting member carried thereby and movable relatively thereto, means for intermittently actuating said carrier to move said work-support ing member to a plurality of tool stations and co-operating clamping means at each of said tool stations movable transversely of the direction of movement of said carrier operable to engage said work-supporting member and to position the same accurately irrespective of the correct position of the carrier.

8. In a machine of the class described, a base, a movable carrier, a work-supporting member carried thereby and movable relatively thereto, means for intermittently actuating said carrier to move said work-support- I to lock the positioned work-supporting member against displacement.

9. In a machine of the class described, a

base having a fixed central member presenting an accuratelygfinished cylindrical surface, a table rotatable about the axis of saidcentral member, a plurality of worksupportting sectors carried by said table and movable relatively thereto havingaccurately finished inner ends complementary to the finshed cylindricalisurface of said central member, means for rotating said table intermittently to present said sectors successively at predetermined tool stations and separate means at each tool station operable to cause ositive engagement of the complementary faces of the sector and said central member "and to lock such sector accurately in position at its station irrespective of the correct position of the table.-

10. In a machine of the class described, a base having a fixed central member presenting an accurately finished cylindrical surface, a table rotatable about the axis of said central member, a plurality of work-supporting sec-- tors carried by said table and movable relatively thereto having accurately finished inner ends complementary to the finished cylindrical surface of said central member, means for rotating said tableintermittently to present said -sectors successively at predetermined tool stations and separate hy-' draulically actuated means at each tool station operable to cause positive engagement of' the. complementar finished faces of the sector and central mem er and to lock such sector accurately in position at its station irrespective of the correct position of the table and means for simultaneously controlling all of said hydraulically operated positioning and locking means.

11. In a machine of the class described, a base, a fixed member presenting an accurately finished surface, a carrier, a work-supporting member carried thereby having an accurately finished surface complementary to the finished surface of said fixed member, means for actuating said carrier to move said worksupporting member to a plurality of tool stations and positioning and locking means comprising relatively movable complementary V- shaped positioning members,; one of which is nished.

upon the work-supporting member and the others of which are mounted upon fixed supports at-the respective stations and means or actuating the movable positioning members to force the finished surface of said workaxis of 'saidcentralmember, a plurality of. work-supportin sectors carried by said table and movable re atively thereto, each having an accurately finished inner end complementary to the finished cylindrical surface of said central member and provided at a distance from said inner end with a re-entrant recess, means for intermittently rotating said table to present said sectors successively at different tool stations, a positioning plunger movably mounted in a fixed bearing at each tool station having a surface complementary to said re-entrant surface, and hydraulic means for causing said plungers to engage the recesses of said sectors and to force the inner ends of said sectors into engagement with the finished surface of said central member.

13. In amachine of the class described comprising a base having a fixed central member presenting an accurately finished cylindrical surface, a table rotatable about the axis of said central member, a plurality of work-supporting sectors carried by said table and movable relatively thereto, each having an accurately finished inner end complementary to the finished cylindrical surface of said central member and provided at a distance from said. inner end with an inclined under-cut V-shaped recess, means for intermittently rotating said table to present said sectors successively at different tool.

stations, a positioning plunger movably mounted in a fixed bearing at each tool station having a surface complementary to said inclined under-cut V-shaped recess, and bydraulic means for causing said plungers to engage the recesses of said sectors and to force the inner ends of said sectors into engagement with the finished surface of said central member and also causing said plung-' relatively to the work carried by the first work-supporting member presented at such station and means at each station operable to engage and position successive work-supporting members accurately with respect to the tool irrespective of the correct position of the carrier.

15. In a machine of the class described comprising a base, a central column rising from said base, a table rotatable about the axis of said column, a'plurality of work-supporting members carried by said table, each movable relatively thereto, means for rotating said table to present the work-supporting members successively to a tool station, a tool-supporting bracket rotatably adjustable upon said column, a tool carrier mounted upon-said bracket, means for adjusting said tool carrier relatively to said bracket to center the tool with respect to a positioned work piece carried by a work-supporting member, and means at said tool station operable to engage and position the work-supporting members accurately at said tool station irrespective of the correct osition of the table.

16. In a machine of the class described comprising a base, a central column rising from said base, a table rotatable about the axis of said column, a plurality of work-supporting members carried by said table, each movable relatively thereto, means for rotating said table to present the work-supporting members successively to a plurality of tool stations, tool-supporting brackets rotatably adjustable upon said column, tool car 'riers mounted upon said brackets at the respective stations, means for adjusting each tool carrier relatlvely to its bracket to center the tool with respect to 21 positioned work piece carried by a work-supporting member and means at each tool station operable to engage and position the work-supporting mem ers accurately at such tool station irrespective of the correct position of the table.

17. In a machine of the class described comprising a base, a central column rising from said base, a table rotatable about the axis of said column, a plurality of work-supporting members carried by said table, means for rotating said table to present the work-supporting members successively to a plurality of toolstations, tool-supporting brackets upon said column, a tool carrying frame hinged to said bracket and horizontally adjustable relatively thereto and a tool carrier mounted on said frameand means for adjusting the same vertically thereupon, whereby the tool may be positioned horizontally and vertically by said adjustments in proper relation to any portion of the top oft e work piece carried by said work-supporting member.

18. In a machine of the class described comprising a rotatable work-supporting carrier, meansfor intermittently actuating said carrier a predetermined portion of a revolution,

hydraulic means yieldably operable gradually to arrest said carrier at a predetermined position and means operable by the yielding movement of said carrier-arresting means automatically to render the carrier-actuating means inoperative.

19.- In a machine of the class described, comprising a rotatable work-supporting carrier, means for intermittently actuating said carrier a predetermined portion of a revolution, yieldable means operable gradually to arrest said carrier at a predetermined position and means operable by the yielding movement of said carrier-arresting means to release said carrier-actuating means.

20. In a machine of the class described comprising a rotatable table, means for actuating said table, yieldable stop mechanism positioned to be engaged by a member upon said table and means operable by said stop mechanism when thus engaged and actuated to release said table-actuating means.

21. In a machine of the class described comprising a rotatable table, means for actuating the same, means for arresting the table in a plurality of predetermined positions including shouldered members upon said table, a pivotally and slidably mounted stop positioned to be engaged by said shouldered members, means for cushioning the lateral move- -ment of said stop when engaged and means operable by the lateral movement of said stop to release the table-actuating mechanism.

522.- In a machine of the class described comprising a rotatable table, means for actuating the same, means for arresting the table in a plurality of predetermined positions including shouldered members upon said table, a pivotally and slidably mounted stop positioned to be engaged by said shouldered members, hydraulic means for cushioning the lateral movements of said stop when engaged, means operable by the lateral movement of said stop to relesase said table-actuating means and means hydraulically operable respectivel to disengage said stop from said shouldere members and to 'move said stop laterally to normal position.

23. In a machine of the class described comprising a rotatable table, a plurality of Worksupporting members carried thereby and movable relatively thereto, means for rotating said table, cushioned stop mechanism operable to arrest said table with the work-supporting members at predetermined tool stations, means operable by the yielding movement of said stop mechanism to release the table-actuating means and means at each stationoperable to engage and accurately position the work-carrying members at such station.

24. In a machine of the class described comprising a rotatable table, a plurality of work-supporting members carried thereby and movable relatively thereto, means for roieo