US1231721A - Feeding mechanism in metal-working machinery. - Google Patents

Description

H. DRESES.

FEEDING MECHANISM IN- METAL WORKING MACHINERY.

APPLICATION FILED JULY 2.1915.

1,231,721 Patented July 3, 1917.

4 SHEETS-SHEET l.

H. DRESES. FEEDING MEcHAmsM 1N METAL WORKING MACHINERY. APPL-ICATION 'FILED )ULY 2 1915.

f 1,231,721- Patented July 3, 1917.

4 SHEETS-SHEET 2.

ffy-J? j JZ - .w gym s@ 19' H. DRESES.

FEEDINGMECHANISM 1N METAL woRKlNG MACHINERY.

APPLICATIONILED IULY 2.1915- n Patented July o, 1917.

4 SHEETS-SHEET 3.

` H. DRESES.

vFEEDlNG MECHANISIVI iN METAL WORKING MACHINERY.

APPLRCATION FILED JULY 2| 1915. 1,231,721 Patented July 3, 1917.

4 SHEETS-SHEET 4.

HENRY DBESES, OF CINCINNATI, OHlTO.

FEEDING MECHANISM IN METAL-WORKING MACHINERIY.

' To all lwhom t may concern.'

machinery employing an axially feeding movement.

tool, and is applicable, for instance, in drilling machinery and other machinery employing a drilling, tapping, boring or similar tool, and is exemplified as applied in a socalled drilling machine.

` It is the object of my invention to provide novel means whereby the distance of axial movement of the tool is controlled, and further, to provide novel controlling means acting on the tool-spindle for setting its limit of axial movement a't a denite point irrespective of the number of repetitions of said I have herein shown and described novel means for counterbalancing the tool-spindle which are compact vin structure, comparatively short in movement of the moving parts, and so arranged as to be a self-contained structure with the 'tool-feeding mechanism, but I do not herein claim said meansfor counterbalancing the toolspindle, but show, describe and claim the same in an application which is .divisional hereof, being Serial No. 60,295, filed November 8, 1915, and issued as Patent- No.

1,181,580, dated May 2, 1916.

The invention will be further readily un derstood from the following description and claims, and from the drawing, in which latter Fi re 1 is a front elevation of so much of a rilling machine as is necessary toillustrate my invention.

2 is an enlarged front elevation of my improved mechanism.

3 is a plan view ofthe same.

Fig. 4 is a cross-sectional detail taken on the line 4-4 of Fig. 2, showing a bottom view of the control mechanism.

Fig, 5 is a vertical section of the same taken on the axial line of the feed shaft, on the line 5 5 of Fig. 2.

Fig. 6 is a detail in front elevation, showing the shifting means 'for the two-speed speed-changing mechanism.

Fig. 7 is a vertical section of my improved Specification of Letters Patent. Application led July 2, 1915. Serial No. 37,760.

Patented July 3, 191'?.

device taken on thel axial line of the toolspindle, on the line 7-7 of Fig. 2.

Fig. 8 is a horizontal section of my im-` proved device, taken 'on a line corresponding to the line 8--8y of Fig; 5.

Fig. 9 is a cross-section of the same taken on a line corresponding to the irregular line Of 5. ,i

Fig. 10 is a. detail in front elevation of the four-speed speed changing means, section on the line 10-10 of Fig. 10a.

partly in Fig. 10a is a cross-section of the same on i of my imtakcn'on' a line corresponding to the line 15-15 of Fig. '14.

In the present exemplification of my inventionz 15 represents the radial drill-arm, which ,1s arranged to have suitable movement up and down and about a column designated generally as 16. A suitable toolhousing, shown as a drill-head 17 is provided. It is shown mounted on aslide 18,

yarranged to slide laterally on guideways 19 o n the drill-arm, being adjusted by a handwheel 2O which rotates a suitable pinion 21 meshingl with a 'rack 22 extending lengthwise of the drill-arm, and arranged to place the drill-head at suitable points alon the drill-arm, as is usual in structures o this character, for positioning the tool, as the drill 23, with relation to the material, represented as a casting 24C.A

26 represents the drive-shaft which in the presentfexemplification is arranged to provide the driving force for rotating and also for feeding the drill-spindle 27, at the lower end of which the drill 23 is secured. The

.shaft 26 is arranged vto be driven in suitable or usual manner for having different speeds the character of operations it is desired to perform.

Ahub 31 has spline-connection 32 with the drive-shaft' and lis arranged to be moved 4imparted thereto by power,I depending on `A on the end of a l ver 66ay vThe lever is pivoted on lengthwise along the drive-shaft, as by being journaled in a bearin 33 of a bracket 34 extending from the sli e 18 of the drill-head. (See Figs. 7, 8, '9 and 11). This hub has a bevel-gear 35 thereon, which meshes with a bevel-gear 36 on a shaft 37 journaled in a bearing 38 on the slide and having a second bevel-gear 39 secured thereto.

The drill-head is arranged to be adjusted about the axis of rotation of the shaft 37 for placing the drill-spindle in uprightposition or at an angle with relation to the work. The drill-head is guided in this adjpstment by an annular guideway 40 on the slide and is arranged to be clamped in adjusted position, as by clamp-bolts 41, extending throu h holes 42 in the drill-head, the heads of t e bolts being received in an annular T-slot 43 in the slide, nuts 44 clamping the parts toether.

, The bevel-gear 39 meshes with a bevel-gear 46,. the hub of which ing 47 of the drill-head and has spline-connection 48 with the drill-spindle for rotating the drill-spindle in its bearings 49 of the drill-head.

A second bevel-gear 50 is secured to and rotateswith the bevel-gear 46 and meshes with a bevel-gear 51 fast on a shaft 52 ]our naled in a bearing 53 of the drill-head and at its other end carrying spur-gears 54 of different diametersfast thereon, forming a nest of gears. (See Figs. 3, 5, 8 and 9).

The gears 54 mesh respectively with gears 55 of a coacting nest of gears arranged to be selectively secured to ashaft 57 exemplified as accomplished 'through a ducking key 58. This key is on a, key-bar 59 sliding in a roove 60 in the shaft 57 and pressed toward ey-slots 61 in the gears A55,bya spring 62. A separating collar 63 insures engagement of the key with only one gear at a time. The key-'bar 1s connected at its inner end at 64 with a sleeve 65 having longitudinal movement on the shaft 57 and controlled by a lea shoulderbolt 67, and has a fork 68 thereon which is received abouta pin on an extension 69 of the sleeve, said .extension slot 70 in the drill-head, for moving the sleeve. (See Figs. 5, 6, 8 and 9).

A shaft 71 is in line with the shaft 57 and is journaled in a bearing 72, the shaft 57 being journaled in a bearing 71 has a hollow inner end 74 in'which the uter end of the shaft 57 is received. clutch 75 is -located between the shafts 57 and 71 for forming drive-connection between said shafts or releasing the driveconnection of shaft 57 from the shaft 71. The said'clutch is exemplified as a toothed clutch, the teeth of which shaft71 andon a clutch collar 76 which has spline-connection 77 with the shaft 57.

is journaled in a bear- Y gears of the nest of gears rotating in a being guided in a 7 3.- The shaft are respectively Gears 80 forming ferent diameters are fixed onl the shaft 71. The 'shaft 71 is held against endwise movement by locating its bearing between said nest of gears and the annular fiange 81 carl'ying-the clutch-teeth formed on said shaft.

he shaft 57 is held against endwise movement by locating its bearing betweenl the gears 55 and a collar 82 fast on said shaft.

Movement of the clutch-collar 76 is controlled by a lever 86, which is fulcrumed on a shoulder bolt 87 on the drill-head and is provided with a fork 88 received in the annular groove 89- of the clutch-collar, the fork being pivoted by its pin 90 in a bearing 91 of said lever. (See Figs. 8, 9 and 12). The movement of the lever controls the clutched or unclutched relation of the a nest of gears of difparted to the drill-spindle or said feeding movement is stopped.

The respective gears of the nest of gears 80 mesh with the gears of a nest of gears 93 of different diameters normally loose on a shaft 94 but arranged to beselectively xed to said shaft in suitable manner, as by a ducking key 95. (See Figs. 8, 9 and 10). Collars 96 about the shaft 94 between said 93 'prevent simultaneous meshing of said key with more than any one of the gears of said nest of gears.

The key is arranged to make engagement l* with said gears by being` received in the selective key-slots 97 in the bores of said gears. The ducking key is on a key-bar 98 sliding in a' groove 99 in the shaft 94 and pressed toward the key-slots 'by a spring 100. The key-bar has connection 101 with a slide- 102 having slide bearing on the shaft 94.

The shaft 94 is journaled in bearings 103 on the drill-head. The slide 102 is provided with a rack' 105 withwhich a pinion 106 meshes, the pinion being on a shaft 107 bearing 108 of the drill-head and having a handle 109 fast thereon for rotatin the shaft, (see also Figs. 2, 7, 10 and 10a), t e handle being provided with the pointer 110 arranged to register with the respective markings of a gage 111 on the drill-head for indicating the position of the ducking key.

The speed of feed of the spindle is`determined by the drive-connection between the shafts 71 and 94 through the respective gears of the nests of gears 80 and 93, for

A imparting four different speeds of feed to the drill-spindle. In the present instance these speeds are multiplied by two by engagement of the l'ducking key 58 with .the respective gears 55.

A feed-shaft 114v is provided. A worm 115 is fast on the a worm-wheel 116 which is fast on a bushing 117 journaled in a bearing 118 of the drilli head and prevented from endwise movement shaft 94 and meshes with by the annular flange 119 of said bushing at one end of said bearing and the worm-wheel fast on said bushing at the other `end of said bearing.

The feed-shaft is rotatable in said Ibushing when it is desired to impart avspeedy rotation by hand to the feed-shaft, for rapidly raising or lowering the drill-spindle, and said bushing is arranged to be fixed `to said feed-shaft during the feeding movement of the drill spindle, this selective attachment or detachment of the worm-wheel with the feed-shaft being accomplished by means` of a4 clutch 120 exemplified as a toothed clutch,

the teeth of which are respectively located on the bushing 117 and a hub 121. (See- Figs. 2, 5 and 11).

The hub 121 is slidable lengthwise on a bushing 122. The bushing 122 is fixed to the feed-shaft, as by key and pinrvconnection as shown. The hub `121 has spline-connection 124 with the bushing for disengagement of the clutch 120 when\it is' desired to rotate the feed-shaft by hand for quick axial movement of the drill-spindle, or for engagement of said clutch when it is desired to rotate the feed-shaft by power or by means of a handwheel 125 for feeding the drill-spindle. The

hub 121 is provided with a cap 126, a rod' 127 extending inwardly from said cap int-o the hollow 128 in the end of the feed-shaft. The inner end of the rod is provided with a collar 129 fixed thereon between which and,

a collar 130, xed in the outer end of the hollow of said shaft, a helical spring 131 is arranged for normally pressing the cap and consequently the hub 121 upwardly for normal engagement of the clutch 120.

The hub 121 is moved axially by means'of arms 134 pivoted on pins 135 to the hub and having knobs 136 at their inner `ends received in an annular groove 137 in the bushing 122. If it is desired to impart Vquick rotation to the vfeed-shaft without rotating the worm-wheel, downward pressure is exerted upon the outer ends of any oneof the arms 134, whereby the hub is pushed' awayv from the bushing 117 for disengaging the clutch 120, whereupon the hub may be turned by means of the arms forv quick axial movement of'the drill-spindle, a pin 138 guided in a hole 139 in the hub being spring-pressed by a spring 140 into a notch 141'in the bushing 122 for holding said hub in down position and the clutch in unclutched relation when one of. the arms 134 has been manipulated for the purpose, a slight upward blow or push on any one of said arms moving said pin out yof its notch and causing rengagement of said clutch by the action of said spring 131. The connection between the feed-shaft and the spindle in the present exemplification is accomplished by providing the feed-shaft with a bevel-pinion 143 which meshes with a provided with a pinion 149 which meshesv with a rack 150 on a rack-sleeve 151 slidable lengthwise in a bearing 152 in the drillhead, the drill-spindle having a reduced end 153 extending through said sleeve, the said sleeve and drill-spindle having combined axial movements. (See Figs. 7, 11 and 14.) There Ais preferably a ball bearing 154 between the lower end of the sleeve and the annular shoulder 155 on the drill-spindle, the upper end of the drill-spindle being provided with a bearing 156 for the upper end ofthe sleeve.

In order to control the limit of feeding movement of the drill-spindle, for instance for arranging the drill-spindle for separately drilling a plurality of holes of equal depths in material, and for other purposes I provide novel controlling mechanism for t e depth of feed of the. drill-spindle.

In the. resent exemplification of this deshaft. The plate 166'is provided with a stud 169 on which a pinion- 170, which meshes with the internal teeth 165, rotates, this pinion also meshing with a pinion 167, the teeth of which are cut in the feed-shaft. The plate 166 is .prevented from rotating by being provided with a pin 171 which is received in a slot 172 of a retaining part 173 secured to the drill-head. The plate 161v is arranged to be selectively secured to the ring 164 and it is also provided with a striker-part 174, f

shown as a striker-pin.

The'striker-pin 174 is arranged to coact with a striker-part 175 adjustable on the' lever 86, which controls the clutch 75. The striker-part 175 is adjustable in a slot 176 of a lug 177 on the lever and has a slot 178 through which a clamp-bolt 179 passes into the lug for clamping the striker-part in adjusted position to the lever.

When the striker-part 174 strikes the striker-part'175 thev said clutch is thrown into disengaged relation, and the time of this striking is controlled by the position of the plate r161v with relation to the` ring 164, this positioning being indicated by a gage 180, the markings of which are shown on the inverted frusto-conical face 181 of the plate 161 and the coacting fingerV 182. The striker-part 175 on said lever is provided with` inclined faces 183 coacting with the striker-part 174 for ease of operation.

' The lever 86 is providedwitha handle 184 located in clined, the

for manual control of the clutch 75.

It will be noted that the feed-shaft is incontrolling device being correspondingly inclined, the markings of the gage being on the inverted frusto-conical face of the control device for placing said maikings in convenientposition for being rea For positioning the relation between the plate 161 and the ring 164, I provide one or more pull pins 186. The inner end of the pins 186 is-provided with a tooth 1,87 arranged to engage in the toothed spaces of the external teeth outer end having a knob 189. A pin 190 screw-threaded in the outer end of said hole,

and pressed inwardly by a sprinf 198, is arranged to engage oeither one o the recesses 194 for holdin said tooth-pin in engaging or disengage position with relation to said ring. l

When it is desired to control the depth to which the drill shall enter a pieceA of work, the drill is fed axially either by hand or power, so that its point will be in the plane of the face of the work it is desired 5 that the drill shall enter, as shown in Fig.

1,-whereupon the feed of the drill is stopped. The teeth 187 are then pulled outwardly to disengage the ring. 164, which Vreleases thev plate 161, which i`s then free to turn about the feed-shaft. The plate is then turned manually until the desired marking on its gage 180, representin the desired depth of rilled, is opposite the For instance, hole of two inches depth, the plate 161 is turned until the marking 2 representing two inches on the gage'180 is opposite the plate 161.

pointer 182, whereupon the tooth-pins 186 are pushed inwardly for causing the teeth 187 at their inner ends to engage between the teeth at. said point of adjustment located in the ring 164.

When now the feed-shaft is caused to turn, the pinion 170 is caused to rotate for imparting motion to the ring 164, which is thereby caused t@ turn for rotating the It may be here stated that the strikerpart 174 is located at the zero position of the gage 180, and that in the adjustment of the plate 161 the striker-part 174 thereon has been distance'd from the striker-part 175 an angular distance corresponding to the arc of movement of the striker-part 174 during the desired' axial drilling movement of the drill-spindle. The speed of this angular movement is substantially greater than the speedof said axial movement, owing to the structure and arrangement of the parts so that minute subdivision of the gage and of the parts as many 188 on the ring 164, its

a hole 191, closed by' a plug 192,

if it is desired to drill al the spaces accuracy indepths of holes cut is obtained. The movement of the gage is preferably relverse to the direction of rotation of the feed-shaft.

The striker-part l174 travels this angular distance and at the end of this travel it strikes the striker-part 175 for disengagmg the clutch 75. Upon disengagement of this clutch-the axial feed of the spindle ceases. The spindle is then raised for drawing the tool out of the work, or anotherpiece of work the operation repeated-without readjustment times as desired.

For causing quick 4disengagement of the clutch 75, the lever 86 is provided with a pin 196 whose end is provided with inclined faces 197 which Vcoaotwith the inclined faces 199, on a pin 201 on. the drill-head. One of the pins, instanced as the pin 201, is spring-pressed by a spring 202 toward the other pin, instanced as the pin 196, the advancing movement between the inclined and the work shifted, substituted, andy the apex of the pin 201, the inclined faces being spring-pressed toward each other, will cause rapid movement of the lever for disengagng the clutch -with a quick movement. Corresponding quick reverse movement and therefore quick engagement between the clutch teeth is also assured by this device.

I have in my improved device provided novel means for counterbalancing the drill- -spindle by means in which a counterweight is provided which has a comparatively short range of movement and is self-contained with the drill-head. (See Figs. 7', 11, 14 and 15). Thus 204 is a counterweight which has movement lengthwise of the upward ex- ,tension 205 of the drill-head.l The counterweight is rovided with a guideway 206 coacting wit a guide 207 on said upward extension. A rod 208 is securedr in a lug 209 of said upward extension and slides in a bearing 210 on said counterweight. The counterweight is also provided with a rack 211 with which a pinion 212.0n the shaft 145 meshes. This construction forms operating and guiding means for the counterweight.

The pinion 149 which meshes with the rack for axial feed of the tool-spindle and the pinion 212 which meshes with the rack- 211 on the counterweight are both fast on the same shaft, the rack of the drill-spindle and the rack of the counterweight engaging said pinions respectively at opposite sides of said shaft, so that the weight of the counteracting downwardly upon oneside of the pinion 212 forces the opposite side of the pinion 149 upwardly for balancing the weight of the drill-spindle.

It will be further noticed that the pinion 149 is larger than the pinion 212. A given 13o member adjustable for angul mamar axial movement of the drill-spindle will therefore result in a less distance of movement of the counterweight, so that the distance through which the counterweight moves is comparatively short, thereby. necessitating only a correspondingly short range of space for permitting this movement and resulting in economy of space in the structure and providing a self-contained counterbalancing structure for the drill-spindle.,

The shaft 145 has the pinions 149, 212, formed thereon. The bevel-gear 144 is fast on the shaft 145. A bushing 213 is fast inI a bearing 214 of the drill-head. A bushing 215 is received about' the shaft 145 between the gear 149 and the rack 150 and is fast in a bearing 216 of the drill-head. The shaft 145 rotates in the bushings 213, 215, and is held in place thereby.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent, is: j

1. In feeding mechanism of the character described, the combination of a tool-spindle, a feed train of gearing for feeding said toolspindle axially rotatable shaft and a -clutch, a tripping mechanism for said clutch comprislng a ar distance of movement about the axis of rotation of said rotatable shaft for adjustably fixing the moment of tripping of said tripping mechanisml and a train of gearing between said rotatable shaft and said member for rotating said member.

2. In a feeding mechanism of the character described, the combination of a toolspindle, a feed train of gearing for feeding said tool-spindle longitudinally comprising a drive-shaft, a rotatable shaft and a clutch, a rotatable member having thereon, a trip on said`rotatable member in radial line wlth the zero position of said gage, a coacting trip therefor having operative connection with said clutch for tripping the same, said rotatable member adjustable about the axis of rotation of said rotatable shaft for positioning the graduations of said gage with relationto said coactin trip, and a train of gearin between sai rotatable shaft and said r atable member for rotating said rotatable member. i

3. In a feeding 'mechanism of the character described, the combination of a toolspindle, a feed train of` gearing for axially feeding said tool-s indle comprising a driveshaft, a clutch an a rotatable shaft, clutcho erating means, a rotatable element about t e axis of rotation of said rotatable shaft providedv with a substantially .peripheral gage and with a tripper-part lfor said clutchoperating means, means for adjustingsaidcomprising a drive-shaft, a

an annular gage.

a train of gearing between said shaft and rotatable element for rotating the latter in predetermined relation with the axial movement'of said tool-spindle.

4. In a drilling. machine, the combination of a drill-head, an axially movable drillspindle therein, a drive-shaft, alfeedtrain of gearing for ,longitudinally feeding said drill-spindle mounted on said drill-head and comprising a clutch and a feed-shaft, said ymoment of coperation of said control-part with said clutch-operating means.

5. In a drilling machine, the combination of a drill-head, an axially movable drillspindle therein, a drive-shaft, a feed train of gearing for longitudinally feeding said drill-spindle mounted on said drill-head comprising a clutch and a feed-shaft, said drive-shaft having operative connection with said feed train of gearing for driving the same, means for operating said clutch, a control means for said last-named means comprising a rotatable element aboutsaid feed-shaft and a control part for said clutchoperating means, a train of gearing between said feed-shaft and said rotatable element, means for adjusting the relation between said last-named train of gearing and said rotatable 'element for controlling the moment of .coperation of said control-part with said clutch operating means, a slide, and means for selectively adjusting said drill-head on said slide whereby the direction in which said tool-spindle extends is adjusted withrelation to the vertical and the others of said aforementioned parts are maintained in their relations with said toolspindl, for the purpose described.

6. In feeding mechanism of thescharacter described, the combination of a tool-s indle, a feed train of gearing for axially fleding said tool-spindle comprising a drive-shaft, a rotatable shaft and a pair of clutches, a rotatable element having operative connection with one of said clutchesfor operating the same, said rotatable element adjustable about the axis of rotation of said rotatable shaft for controllingr its moment of operation of said last-named clutch, and means for manually4 operating the other of said clutches for interrupting said feed train of i gearing and placing said spindle feed under manualcontrol of the operator.

7. In a feeding mechanism of the character described, the combination of a toolspindle, a feed train of gearing for axially feeding said tool-spindle, said feed train of gearing comprising a drive-shaft and a feedshaft, a gear onthe latter, a rotatable element about the axis of rotation of said feedshaft, 'an internal gear, means for adjustably connecting said internal gear and said rotatable element,said gear on said feedshaft having gear connection with said internal gear, said feed train of gearing comprising gearing between said drive-shaft and said feed-shaft including a clutch and said rotatable element having a clutch operating part thereon adjusted for determining its moment of operation by said adjustment of said rotatable, element.

8. In a feeding mechanism of the character described, the combination of a toolg spindle, a feed tram of gearing for axially feeding said tool-spindle, said feed-train of gearing comprising a drive-shaft and afeedshaft, a gear thereon onX said feed-shaft, a rotatable element about the axis of rotation of said feed-shaft, an internal gear, means for adjustably connecting said internal gear and said rotatable element, said gear on said feed-shaft having gear connection with said internal gear, said feed train of gearing comprising gearing between said drive-shaft and said feed-shaft including a clutch and said rotatable element having a 'clutch operating part thereon adjusted for determining its moment of operation by said adjustment of said rotatable element, a second clutch in said feed train of gearing, and manually operating means therefor whereby said lastnamed clutch is interrupted and said feedshaft placed under manual control of the operator.

9. In a feeding mechanism of the character described, the combination of a toolspindle, a feed train of gearing for axially feeding said tool-spindle comprising a driveshaft, a feed-shaft, and a clutch between said shafts, a clutch operating part, a rotatable member .about said feedshaft having a clutch controlling part thereon coacting with Said clutch operatlng part, an internal gear for said rotatable member, means for adjustably connecting said rotatable member and said internal gear for determining the moment of operation of said clutch operating part, and a gear on said feed-shaft, said last-named gear being in train with said internal gear. 10. In a feeding mechanism of the character described, the combination of a toolspindle, and means for axially feeding said tool-spindle comprising a drive-shaft, a slanting feed-shaft, a rotatable member adjustable thereabout, and a clutch between said shafts, said rotatable member having a substantially inverted frusto-conical peripheral face having indicating means Lagaf/a1 thereon for indicating the extent of said adjustment, a clutch operating member, said Vrotatable member having a tripping part l thereon coacting with said clutch operatmg member and adjusted by the adjustment ofv said rotatable member about said feed-shaft. 11. In feeding mechanism of the character described, the combination of a tool-spindle, a feeding train of gearingfor axially feeding said-too1spindle comprising a driveshaft, a slanting shaft and a clutch between said shafts, a clutch operating means, a rotatable element about Said slanting shaft having a tripping part thereon coacting with said clutch operating means, means for adjusting saidL rotatable element about said slanting shaft, and means for rotating said rotatable element from said slantingshaft at a reduced speed with relation thereto.

12. In feeding mechanism of the character described, the combination pf a toolspindle, a ower train of gearing for axially feeding said tool-spindle comprising a driveshaft, a slan ing shaft and a clutch, .a clutch operating means, a rotatable element about said slanting shaft having a tripping part thereoncoacting with said clutch-operating means, means for adjusting said rotatable element about said slanting shaft, means for .rotating said rotatable element from said slanting shaft at a reduced speed withrelation thereto, a manually rotatable` means forsaid slanting shaft, `and a clutch between said *power train of gearing and said manually rotatable element\ for interrupting the operative connection between said power and said slanting shaftkand train of gearin anting shaft under manual placing said s control of the operator.

13. In' a feeding mechanism of the character described, the combination of a toolspindle, a power train of gearing for axially feeding said tool-s indle comprising a driveshaft, a feed-sha t, a clutch between said drive-shaft and said feed-shaft, a clutch operating part, a rotatable member about said feed-shaft having a control-part thereon for erating\part, a rotatable member about said feed-shaft having a control-part thereon for said clutch operating part, means for rotating said rotatable member from said feed shaft, and amanually controlled clutch between said last-named clutch andcsaid feedshaft.

15. In a feeding mechanism of the character described, the combination of an --ax1- feedable tool-spindle,

ally feedable too1-spind1e,a feed train of gearing for axially feeding said tool-spindie comprising a drive-shaft, a. feed-shaft and a clutch, a rotatable member having a part thereon arranged for operating said clutch, an internal gear, gearing be-` tween said feed-shaft and internal gear for rotating said internal gear, and means for adjusting the operative connection between said internal gear and said rotatable member for controlling the moment of actuation of said Clutch.

ll 3. ln feeding mechanism 'of the characteil described, the combination of an axially feedable tool-spindle, a feed train of gearing for axially feeding said tool-spindle comprising a drive-shaft, afeed-shaft and a clutch, means for operating said clutch comprising a rotatable member journaled about the axis of rotation of saidfeed-shaft, an internal gear, a gear on said feed-shaft, gearing between said last-named gear and said internal gear for rotating said internal gear from said feed-shaft, means for adjustably securing together said rotatable member and said internal gear, and a trip-- per part on said rotatable member coperating with said clutc p V17. In feeding mechanism of the character described, the combination of an axially a feed train of gearmg for axially feeding said tool-spindle comprising a drive-shaft,afe`edshaft and a clutch, a pair of plates received about said feed-shaft, an external gear and an internal gear between said plates, journaled toV one of said plates, 'means for adjustably securing the other of said plates to said internal gear, and tripping means on said last-named plate-Z for tripplng said clutch, said tripping means movable with said last-named plate for adjusting the trip.- ping moment of said clutc 18. In feeding mechanism of the character described, the combination of an axially feedable tool-spindle, a feed train of gearing for axially feeding said tool-spindle comprising a drive-shaft, a slanting shaft and a clutch, an upper plate and a lower plate received about said slanting shaft, an external gear and an internal ygear between said plates, said external gear journaled to one of'said plates, `means for adjustably securing the other of said plates to said internal gear,

` for, a feed-shaft in said external gear said rotatable member for scribing witnesses.

tripping means and an inverted :truste-conical gage on said said tripping means 'movable with said last-named plate for adjustlast-named plate,

said last-named shaft and said feed-shaft A whereby a plurality of different speeds are imparted to saidA feed-shaft, a clutch for op- Aeratively mechanism with said shaft in train with said drive-shaft, a rotatable member about connecting said speed changing 4 said feed-shaft, tripping means on said t rotatable vmember for said clutch, driving means between said feed-shaftv and said rotatable member,` the operative relation between'said driving means and said rotatable member for adjusting the trip} ing moment of said tripping means.

' 20. In feeding mechanism of the character described, the combination of an axially feedable tool-spindle, adrive-shaft theretrain .with said tool spindle, a. shaft in train with lsaid driveshaft, said train comprising a speed changing mechanism, lspeed changing mechanism between said last-named shaftr and said feed-shaft whereby a plurality of different speeds are imparted to said feed-shaft, a clutch for operatively connecting said speed changing mechanism with said shaft in train with said drive-shaft, a rotatable member about said feed-shaft, tripping means on ing means between saidfeed-shaft and said rotatable member, and means for adjusting y the operative'relation between said driving means and said rotatable member for adjusting the .tripping moment of said tripping means.

In testimony whereof, .I have hereunto signed my name in the prence of two sub- HENRY nREsEs.` Witnesses:

HARRY L. Lunen,

TImREsA M. SILBER.

and means for ,adjusting said* clutch, driv-

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