US1757614A - Screw-driving machine - Google Patents

Description

May 6, 1930. G. C. BROWN ET AL 1,757,614

SCREW DRIVING MACHINE Filed Dec. 14, 1928 9 SheetS-Sheet 1 I I 56 ll 0 I I I 2 254v l I I 1 I 157' 0 I I 25 2 I! 259 E Ml. 24 7 245 2 I 'l-r1 mm Gra 6. BT01]!!! Greyory HMWZl/{y May 6, 1930.

G. c. BROWN ET AL 7 1,757,614

SCREW DRIVING MACHINE Filed Dec. 14, 1928 9 Sheets-Sheet 2 gwuentow.

0rd LT Brawl;

Gregory KAfi Vull y I y 0- G. c. BROWN ET AL 1,757,614

SCREW DRIVING MACHINE lFiledDec. 14. 1928 9 Sheets-Sheet 4 I I l I, g H 62 gm I I v amnion Q 670651011212 #12,, i W mug I. I a

Mayes,1930. G. CLIBROWN ET AL v $1,757,614 I SCREW-DRIVING MACHINE 1 Filed Dec. 14, 1928 .9 sheets-sheer 5 1 gwue'ntow I May 6, 1930 G. c. BROWN Filed Dec. 14,

ET AL 1,757, 14

SCREW DRIVING MACHINE r 1928 9 SheetsSheet 6 l l I: I

\wlgxxxnl gumm amnion:

I I Gm 6. Brawn Grgory A/Wilt May 6, 1930. c, BROWN ET AL SCREW DRIVING MACHINE Filed Dec. 14, 1928 9 Sheets-Shee-f T 7 67d Ewan Ghgya [MA May 6, 1930. r BROWN AL i r 1,757,614

CREW DRIVING MACHINE Filed Dec. 14, 1928 [9 Sheets-Sheet 8 I May 6, 1930. Q G. c. BROWN ET AL 1,757,614 scREw DRIVING MACHINE Fi1ed Dec 14, 1928 9 Sheets-Sheet 9 Griz 6T Brawn gww ntom a machine of this character having a maga zine tor contalmng the screws to be used in the Patented May 6, 1930 cm r T REYNOLDS MACHINE COMPANY, OF MASSILLON, OHIO, A CORPORATIOLTOF OHIO soanw-narviue Macrame ApplicationfilediDecember 14, 1928. SeriaLNo'. 225,983.

The invention relates to machines for driving screws and is particularly adapted for use in shops and factories for driving machine screws to fasten two or more parts together with greater speed and accuracy than is possible manually.

The object of the improvement is to provide machine, an improved escapement devicefor receiving the screws from the magazine one at a time and deliveringthem to a vertically movable foot which carries each screw to the work, a screw driver .belng co-ordlnated with ,the movement ofthefoot for driving each screw into the work, means for automatically disengaging the foot from the screw and rai's- Y ing the foot above the driver to permit the screw to be drlven home; means for driving screws into soft metals such as aluminum without the necessity of tapping holes in the indexing ,apparatusfor-carrying small pieces metal to receive the screws; and'to provide an of work, the samebeingIco-ordinated with the movementof the screw driver. and foot to pcsiticn the work beneath the same as the foot and screw driver are lowered.

An embodiment of the invention is illus-- trated 1n the accompanying drawlngs, in

which Figure 1 is a front elevation of the improved screw driving machine to which the invention pertains; l

Fig. 2, a side elevation showing the left side of the complete. machine;

Fig. 3, a similar view of the right side of.

the machine; I

g. 1, an enlarged plan view of the ma- Fig.7, a vertical'transvers'e section through the magazine, taken substantially on the line 7'4, Fig. 5;

Fig. 8, an enlarged fragmentary section through the escapement mechanism, taken substantially on the line 8-8, Fig. 5;

plan section of the magazine and 6, a frontelevation of themagazine Fig. 9, a detached perspective view of the escapeinent mechanism; I Figll0, avertical sectional vlew taken sub stantially onthe line 10-10, Fig.4, showing the driving head and associated parts;

can 0. BROWN AND season? 1?. MQN'ULTY, or MAssrnLoN, OHIO, AssIeNons ro- Fig. 11, an enlarged sectional view through the driving head taken substantially on the line 11-11, Fig. 10; Fig.'12,

levers; V

Fig. 13, a detail sectional view showing the clutch release shaft'anda'ssociated parts; i

F l ha detail perspectivefview ofa portion of the clutch release shaft and the throwout cam;

mg. 15, a perspective view of the gearing and cams'for operat ng the apparatus;

Fig. 16, a detail sectional view with parts broken away, showing the cross slide and the vertical slide which carries'the foot, the screw driver and foot being shown 1n ralsed pos1- tion" i Fig. 20, a section of thefriction mechanism in the driving-head taken substantiallyon the line 20 20, Fig. 11.

' Similar numerals refer to similar parts throughout the drawings.

Referringmore particularly to the embodiment illustrated in the accompanying draw a section taken substantially on the line 12- 12, Fig, 1, showing the cams and cam Fig; 17,'a-si1nilar view showing the foot lowered and the driver n the act of drlvlng:

showing the driver ings, the machine may be supported uponan upright or standard 21, having the base 22 at its lower'end and the housing'23 at its upper.

end the mechanism being housed'in' and upon the same. f

The work carrying table 2 1 is provided with the slide portion 25 slidable. upon the vertical guides 26, on the standard, and adapted to be vertically adjusted thereon by the nut .2 hi h; i threaded upon the stationary screw'29'and arranged to be rotated through thespiral gear 30 and hand crank 31. I

mounted upon the arm The mechanism may bedriven by'a motor 32 which may be mounted upon the base 22, the shaft 33 thereof havinga pulley 34 fixed thereon for connection of a belt 35 which extendsover a pulley 36 fixed upon the main driving shaft 37 journaled in abearing 38 upon the housing. 7 I

A spiral gear 39 is fixed upon the opposite end vportion ofthe shaft, 37 withinthe gear housing 40 and meshes with the spiral pinion 41 upon-the screw driving shaft 42 located within the driving head housing43 which is or bracket portion 44 of the main housing. 1

A spiral pinion 45 is fixed upon an inter V mediate port-ion of the'shaft 37 and meshes with a similar pinion 46 upon the worm shaft 47, the worm 48 thereon meshing with the worm gear 49 upon the clutch and cam shaft A spiral gear 51, fixed upon a shaft 52, also meshes with the spiral pinion 45. A spiral pinion 53 is fixed upon the shaft 52 and meshes with a similar pinion 54 upon the worm shaft 55, the worm 56 thereon meshing with the worm gear 57 upon the shaft 58.

A spiral pinion 59 is fixed upon the shaft 58 and meshes with a similar pinion 60 upon the brush shaft 61 upon whichis mounted the brush '62 located within the magazine shown generallyat 63.

A pinion 64 is fixed upon an intermediate portion of the shaft 58 and. meshes with a gear 65 upon the vertical shaft 66 which is journaled in a central hearingilug 67 carried by the radial arms 68 of themagazine. The

conical dial 69," which rotates within the lower portion of the magazine, is fixedupon "the lower end of the shaft 66.

The magazine'63 is substantially circular in plan view and comprises the annular side wall 70 having an inturned beveled flange 71 formed or fixed to its lower edge. The conicaldial 69 is inclined downward toward its periphery, which is located in the same horizontal plane with the beveled flange 71 and spaced therefrom a distance corresponding to the diameter of the shanks of the screws to bedepo'sited thereon, and the circumferential edge of the dial is likewise beveled at its upper face as at 72, corresponding with the bevel of the flange 71. J

The periphery of the dial is spaced sufliciently from the flange 71 to form a circular space or runway into which the stems of the screws, supplied to the magazine, fall and are suspended by reason of the heads thereof resting on the beveled edges of the dial and flange 71;

The circular brush 62 is of such diameter that it will brush back any surplus screws which may be carried forwardby the dial and allow only those to pass which are suspended by their heads in the annular runway.

A guard ring-73 is connected to the inner surface of the magazine and extends from a point beneath the center of the brush to a point beyond the escapement' mechanism which will be later described. This guardring is" spaced above the flange 1, and the beveled periphery of the rotating dial, a sufficient distance to allow theheads ofthe screws to pass freely beneath the ring when the screws are hanging vertically in the annular runway as indicated at A in Fig. 7. The ring, however, is sufficiently close to the annular runway to prevent any screws passing beneath the ring,fexcepting those which are suspended therein, in the proper position. e

Connected to the inner face of the magazine and extending" from the escapement mechanism to a point spaced from the rotary et arm 78 which is fixed upon the vertical shaft 79 as by the key 80 and nut 81,-said shaft being journaled in abearing boss 82 formed upon the outside of the magazine.

The segment 77 is located directly beneath the magazine and extends across the path of the screwssuspended in the annular runway and acts asa stop for thescrews' indicated at A in Fig. 5;. I

. A rocker arm 83 is fixed upon the upper end of the shaft 7 9' and connected as by a ball and socket joint, indicated at'84, to an arm 85 which is connected by a similar joint indicated at 86 to one arm 87 of a bell crank journaled upon the shaft 88.

The other arm 89 of said bell crank is connected, as by a ball and socket joint indi cated generally at 90, to a link 91 adapted'to be operated by a cam mechanism to be hereinafter described. r

A slide plate 92 is fixed upon the top of the segment 77 as by the screws 93 and is provided in its free end with a notch 94 registering with similar notches 95 and 96 in the segment 77 and arm 7 8 respectively.

The notch 95 in the segment is in the form of an elongated slot within which is slidably located the feed slide 97 having at its rear or inner end an upright stud 98 projecting through a slot 99in the slide plate and engaged by the bifurcation 100 in the sliding block 10 ed as by a screw 103, with the rocker arm 104 fixed uponthe rocker shaft 88. A rocker arm 105 is fixed to the upper end of the shaft and connected as by a ball and socket joint 7 indicated at 106, to a link 1071eadi-ngto the cam mechanism above referred to.

The cam mechanism lncludes a fixed upon the camshaft50 as by a key or spline 109. This hub is provided with a plushaft and mounted in bearings-119 upon; the frame 120 connected to one side of the 1 main housing as by the screws or bolts 121. Levers are mounted upon the shaft v118 for cooperation with the several cams.

The lever 122 is connected at one end to the link 91 and provided with the rollers 123 and 124 for cooperation with the cam 114. A siinilar lever 125 is j ournaled upon the shaft 118 and connected to the'link 107. This lever is provided with a rollercorresponding inpo sition to the roller 123 for cooperation with the cam 115. V

Each of the levers 122 and has a rod 126 connected to its other end, said rod eX-' tending downward and rearward and slidably located through a lug 127 upon the frame 120, a coilspring 128 being located around the rods 126 and interposed between the lugs 127 and the collars'129 at the free ends of the rods, tending to normally urge the levers 122 and 125 toward the cam hub. A lever 130 is ournaled upon the shaft 118 and provided with a roller 131 adapted to 00* operate with the cam116. "This lever is substantially LJ-shaped, the depending arm 132 thereof extending below the main housing and being connected to a link 133 which op-, erates an indexing device which may be placed upon the table 24 for carrying small work and automatically positioning the same beneath the screw driver as will be later de-f scribed.

his indexing device may comprise .a base plate 134 adapted to be detachably mounted upon the work table 24 and having a shaft 135 journaled' therein, upon which is mount: ed the indexingdisk 136 provided with any suitable arrangement of dowel apertures 137 for carrying small pieces of work;

, A ratchet wheel 138 is fixed upon the shaft 135 and adapted to be engaged by a pawl 139 carried upon a lever 140 which is journaled uponthe shaft 135 and connected at its opposite end to the link 133. The pawlis pivoted intermediateits ends upon the lever 140 asindicated at 141 and is normally held in engagement with the ratchet wheel by means of a pull spring'142 connected to the tail'end of the pawl and to the lever 140.

The cam-117 is adapted to engage the roller 143. carried upon the lever 144 which is also journaled upon the rocker shaft 118, said lever having an offset arm 145 adapted to'cooperate with the arm 146'of'a bell crank pivoted as at 147 upon the mainhousing,

hub 108 the other arm thereof. cooperating with the cross slide 149 mounted in the horizontal v guide 150.

This cross slide has a vertical guide 151.

in whiclris mounted the verticalslide 152 carrying {the foot 76 which conveys; the screws one at a time fromthe escapement mechanism to the work.

. The .guide150 has a rod 154 fixed to'one endthereof'as' byxthe end plate 155 and a coil spring 156 is located around said rod and. interposed between the end plate and the opposite end wall 157. of the cross slide, tend ing to normally urge said cross slidetoward the left-as indicatedin Figs. 16 and 18.

For the purpose'of normally urging the vertical-slide 152 upward, to the position shown in Fig. 16, a rod 158 is carriedby the .lug'159 of the'vertical guide portion 160,

of the cross slide. This rod extends upward andis slidable' through the endplate 161 of thevertical slide, a coil spring 162 being 10- cated around the rod and interposed between v the lug 1 59 and the plate 161. p

The screw driving shaft'42 is journaled in a bearing 163, pivoted, as at 164, to the bifurcated end:165 of the lever 166 which'is fulcrumedas at 167 to the upper 'end of a link 168, pivotedas at 169 upon the arm 44 of the main housing.

vTheother end of the lever 166 is provided with a counterweight 170 to normally urge the same toward the position'shown in Fig. 10 and arod 171 has sli'dable thereon a sleeve 172 pivoted to this end portion of the lever, the lower end'of said rod being pivoted, as at 17 3',tothe end portion'of a lever 17 4,. fulcrumed at its other end as at 175 upon the.

arm 44 of thehousing. A coil spring 171 is interposed between the sleeve 172 and a collar or nut 171 upon the rod.

A roller 176' is carried intermediate the ends of the lever 174 and contacts with the periphery of the cam 177 fixed upon the cam shaft50. V I

The screw driver shaft 42 is slidably keyed as at 178 within the tubular shaft 179, upon whiclris fixed the spiral pinion 41. Below the pinion 41 this tubular shaft is enlarged as at 180, the pinion resting againstthe upper shoulder 1810f saidenlarged portion of the shaft; r p

An antifric-tion bearing 182 engages the lower shoulder 183 of said enlarged portion of thetubular shaft and is located within the annular recess 1840f the driving head housing 43. A similar antifriction bearing 185 forms a journal for the upper end portion of the tubular'shaf-t 179 within the recess 186 in the upper portion ofthe housing 43. Nuts 187 and 188 are provided for maintaining the tubular shaft in adjusted position within said bearings. v i

The lower end of the shaft 42 is reduced as at 189 and located within the reduced upper ing. 25

40' shaft.

end of the driving .sleeve1190, being fixed thereto as by the transverse pin 191, this driving sleeve being slidably mounted within the tubular shaft 179. i

I .The lower end portionfof the driving sleeve 7 190-is internally threaded as at 192 and the 7 tube 193, which is located within the lower.

portion of the driving sleeve, is provided at its lower ends with threads engaging said internal threads of the driving sleeve .and has the annular flan e 194 en a in the lower a z: a: a

end of the driving sleeve. 1

A bushing ring 195 is threaded-within the lower internally threadedportion 196 vof the tube 193 and'provided at its lower end with 1 the annular flange 197 engaging the lower end of the tube. V i A r A ball bearing 198 is mounted against the internally shouldered portion 199 of the driving sleeve and j ournaled therein is a shaft 200 having the shoulder 2011 around which is locatedthe collar 202 pinned to said shaft as by the pin 203 directly beneath the ball bear- A ring 204 is threaded into the internally threaded upper'portion 205 of the tube 193 anda coil spring 206 is interposedbetween said ring and a ring 207 which contactswith the internal annular flange 208 formed intermediate the ends of the tube 193.

The lower reduced end 209 of the ring 207 contacts with a series of frictiondisks 210 and 211 connected, respectively, to the tube 193 and the squared portion 212 of the shaft to engage a similar lug 219 at the upper end of the screw driver tool 220, which is received within said socket sleeve and held fixed there- .in as by the set screw 221. f

A lug 222 may be fixed upon the bearing 163 and fixed therein, as by the screw threads 223, is a depending push rod 224 held in ad justed position upon the lug as by the lock nut 225. This pushrodis slidably located through a bore 226 in the arm 44 and arranged to contact with the lug 227 upon the vertical slide 152 to lower said slide foot 76 as shown in Fig. 17. f It should be noted that this foot is offset from the vertical slide as indicated at 228 and with it the and is provided with the slot 229 adapted to register with the notch 94 in the slide plate to receive a screw therefrom, in the position illustrated in Figs. 5 and 19.

The Worm gear 49 is rotatably mounted upon the cam shaft 50 and adapted to be con- The disks 210 are connected tothe tube 193 by means of the lugs 213 received in the.

nected thereto as by a clutch indicated generally at 231, said clutch having an annular groove'232 in which are located shoes'233 carried by the rods 234 slidably located through bearings'235 and connected toa crosshead236 havinga bifurcated portion 237thereon.

' A lever 238 is pivotedatiits upper end to the bifurcation .237 and fulcrumed interme diate its ends, as at 239, upon a link 240 piv oted as at 241 upon'the main housing. The

lower portion of the lever is pivotally connected as at 242 to the clutch operatingrod 243 which is slidably located through the main housing and may be parallel to the cam shaft. J V V v r This clutchrod has. a collar 244 fixed thereon arranged to be engaged by one arm 245 of a bell crank pivoted as at 246'upon a bracket 247' carried by the housing, the other arm' 248 thereof being pivotally connected as at 249.

to the depending link 250. r V

This link'efiends downward along the side of the upright or standard 21 to a point adjacent to the base 22 where it is pivotally connected as at 251 to a bell crank segment 252 fulcrumed as at 253 upon the side of the standard or upright. 1 e T A link 254 is pivotally connected, as at 251*,

to the bell: crank segment and extends forupon the main housing and is slidably and rotatably located through a cam sleevet262 having the V-shaped notches .262 in its'outer end adaptedto be engaged by the similarly shaped cam lugs 263 upon the collar 264 which is fixed upon the outer end of the rod as bythe set screw 265 and nut 266.

A radial lug 267'is formed upon the cam sleeve and adaptedto be engaged by the peripheral lug 268 fixed upon the disk 269 as by the bolt 270; This disk is fixed upon one end of the cam shaft 50.

The operation of the machine is as follows: Assuming the parts to be in the normal or initial position, the screw driver and push rod 224 are raised as-shown inFig. 10, the screwdriver shaft is continuously rotating, the conical dial 69 in'themagazine is-rotating in the direction of the arrow shown on Fig. 5, the brush 62 is rotating in the direction of the arrowv shown on Fig. 7, the worm gear 49 is continuously rotating upon the] cam shaft 50, the cam shaft itself remaining stationary.

The segment 77 is standing in the position shown in Fig. 5, preventing movement of the screws within the annular runway of the magazine, the feed slide 97 associatedwith the segment'isin the "rearward or inoperative position shownin Figs. 8 and 9, the

cross slide l49is in the normal position and the vertical slide is-in the raised position with 76 being raised as shown in said figure and positioned to register, with the notch in the segment 77 as shownin Fig. 5Q

The operator then depresses the treadle 258 with his foot and through the link 254, bell crank segment 252, link250 and bell crank 245 -248 (see Fig, .13) andcollar 244, the clutch operating rod 243-, is-pulled into the POSltlOl'LSllOWIl inFig. 13, meshing the cam lug 263, upon the collar 264, with the cam recess 262 in the sleeve 262. Through the lever 238 thepins 234 are moved inward and through the shoes 233 the clutch 231 is thrown in, coupling the worm gear 49 upon the cam shaft and causing the same to rotate slowly.

The cam 114 will first engage theroller 124 upon the lever 122, and through the rod 91, bell crank v87-89, link 8.5, and rocker arm 83, the rocker shaft 7 9, and with it the segment 77, willberotated towardthe left until the notch therein registers with the annular runway in the magazine, permitting the foremost screw, shown at A in. Fig. 5, to enter said slot.

The cam 114 will then contact with the rocker shaft 79 will be moved back inthe opposite direction, swinging the segment 77 back intov the position shown in Fig. 5, pre

venting further movement of the screws in the annular runway of themagazine and registering the notch 95 in the segment with the notch 229 in -the foot 7 6.- V The cam 115 will at that instant engage the roller upon the lever 125, pulling the link 107 and through the rocker arm 105' the rocker shaft 88 will be rocked, rocking the arm 104 thereof toward the segment 77. Through the link 102, block 101and pin 98, the feed slide 97 will be moved outward, ejecting the screw, shown .at A 1n Fig. 8, from the notch in' the segment and transferring the same intothe notch 229 of the foot 76.

As soon as these operations have taken place, the springs 128 will return the levers 122 and 125 to the normal or initialpositions.

The cam 177 will then operate, through the lever 174,.-link 171 and spring 171* and lever- .166 to lowerthe screw driver and the push rod 224 simultaneously. This lowering of the push rod will, through the lug 227, lower the vertical slide 152, and with it the foot 76, tothe position shown in Fig. 17, positioning the screw A withvre ferenc e to thework, the. screw driver, which is continuously rotatthe work. 7

ing, engaging the screw and driving it into Before the screw is home, the foot 76 will be disengaged therefrom by the pressure of the arm 148 of the bell crank 146-448 against the cross slide, moving the cross slide, and with the vertical slide, sufficiently to disengage the lug 227 of thevertical slide fronrrbeneath the push rod.

. The spring 158 will immediately return.

the vertical slide to the upper position as shown in Fig. 18, the lug 227 thereof resting against the side of the push rod 224; As the screw is driven home in the work, thecam 177 will operate, in conjunction with the counterweight- 170, to return the screwdriver and push rod to the initial or raised position shown in Figs. 10 and 16, permitting the" spring 156 to force the cross slide, and with it the vertical slide, back to the initial position, with the lug 227 positioned beneath the push V 7 rod, as shown in Fig. 16.

At this point the lug 268 upon the disk 269 will engage the radial lug 267 uponthe, cam sleeve 261, rotating the same to force the cam lug 263, upon the collar 264, out of engagement with the cam recess 262 of the sleeve, drawing the clutch operating rod 243 to the left and releasing the clutch, causing the cam shaft to stop rotating with the parts all re turned to the initial position.

small pieces of work, the indexing attachment may be mountedupon the tableand the work positioned,by means of the indexing disk 136. V

With each complete operation of the machine as above described, the cam 116 will operate the L-shaped-leverwand through jigs or the like upon 3 the link 133, lever140, pawl 141 and ratchet .138, the indexing disk will bemoved a sufliperipherallug 268 fromthecam disk 269.

Thus it will be seen that when thetreadle is depressed, the operation of the machine will bestartecl and will continue indefinitely since there is no means for throwing out the clutch at the end of each cycle or operation.

The machine will, therefore, continuously operate to convey successive screws from the magazine by the escapement mechanism to the receiving foot which; Carries them tofih ,work,the screwdriver operating atlthe prop- The work may be carried directly upon the table 24 or if it is desired to operate upon 'ma azine for containin screws an esca 3ementmechanism immediately adjacent tothc magazine for feeding screws from the magazine, a foot arrangedto cometo a position immediately adjacent to the escapement mecha- "nism for receiving the screws from the escapementmechanism and conveying them directly to the work, a screw driver'for driving the screws into the work, and means for lowering the foot and screwdriver to the work immediately after the delivery of a screw to the foot. a

2. A screw; driving machine including a magazine for containing screws, an escapement mechanism immediately adjacent to the magazine for feeding screws from the magazine, a foot arranged to come to a position immediately adjacent to the escapement mechanism for receiving the screws from the escapement mechanism and conveying them directly to the work, a screw driver for driving the screws into the work, means for lowering the foot and screw driver to the work immediately after the delivery of a screw to the foot, and means for withdrawing the foot after thescrew driver has started to drive the screw into the work. I

3. A screw driving machine including a magazine for containingscrews, an escapement mechanism immediately adj acent to the magazine for feeding screws from the magazine, a foot arranged to come to a position immediately adjacent to the escapement mechanism for receiving the screws from the escapement mechanism and conveying them directly tothe work, a screw driver foridriving the screws intothe work, means for lowering the foot and screw driver to the work immediately after the delivery of a screw to the 'foot, means for withdrawing the foot after the screw driver has started to drive the screw into the work, and means for returning the foot to a position adjacent to the escapement mechanism and for raising the screw driver after the screw is driven into the work.

4;. A screw driving machine including. a magazine for containing screws, an escapement mechanism comprising a segment immediately adjacent to the magazine arranged to normally prevent delivery of screws from the magazine and having a notch adapted to receive one screw at a time, means for moving the segment to receive a screw directly from the magazine, and screw holding and driving means arrangedto receive each screw directly from the segment.

5. A screw driving machine including a magazine for contain ng screws, an escapement mechanism comprising a segment immediately adjacent to the' magazine arranged to normally prevent delivery of screws from the magazine and having 'a notch adaptedto re celve one screw at a time, means for moving the segment to receive ascrew directly from the magazine, screw. holding and driving means arranged to receive each screw directly from the segment, and means for-ejecting each screw from tlie'segment and delivering it directly as thes'crew holdingand driving means. 7 i

6. A screw driving machine 'includingai" magazine for containing'screws, an escapement mechanism'comprising a' segment immediately adjacent to the magazine arranged to normally'prevent delivery of screws from the magazine and having a notch adapted to o "receive one screw at a time, means for moving the segment to receive a screw. directly from the magazine, screw holding and driving r means arranged-to receive each screw directly from the segment, and a feed slide asso ciated with the segment for ejecting each screw from the segment and delivering it directly to the screw holding and driving means.

7. A'screw driving machine including a magazine for containing screws, an escape ment mechanism immediately adjacent tothe' magazine for feeding screws from the magazine, a foot arran'gedto come to a position immediately adjacent to the escapement mechanism for receiving the screws from the escapement' mechanism and conveying them directly to'the work, a screw driver for driving the screws into the work, and a'single cam means for automatically lowering the foot and screw driver to the work immediately after the delivery of a screw to the foot;

8. A screw-driving machine including a magazine for containing screws, a foot ar ranged to come to a position adjacent to the magazinefor receiving the screws from the magazine and conveying them directly to the work, a screw driver for driving the screws into the Work, means for lowering the screw driver to the work and a push rod operated by said means for simultaneously lowering the foot to the work. y V

9. A screw driving machine including a Vmagazine for'containing screws, a foot arranged to come to arpositi'on adjacent to the magazine for receiving thescrews from the magazine and conveying them directly to the work, a screw driver for driving the screws into the work, cam means for loweringthe screw driver to the work and a push rod operated by said means for simultaneously lowering the foot to the work. o

10. A screw driving machine including a magazine for containing screws, escapement mechanism immediately adjacent to the magazine for feedingscrews from the magazine, means arranged to come to a position immediately adjacent to the escapement mechanism for receiving the screws from the escapement mechanism and conveying them directly to the work, means for driving the screws into the work, means for automatically lowering the receivin means and driving means to the V D ing the receiving means and driving means to delivery of awork immediately after the delivery of a screw to the receiving means, and means for continuously operating the mechanisms in sequence to contmuously drive successlve screws.

11. A screw driving machine including a magazine for containing screws, escapement mechanism immediately adjacent to the magazine for feeding screws from the magazine,

means arranged to come to a position immediately adjacent to the escapement mechanism for receiving the screws from the escape-v ment mechanism and conveying them directly to the work, means for driving the screws into the work, and means for automatically lowerthe work immediately after the screw to the receiving means.

12. A screw drivingmachine including a magazine for containingscrews, an escapement mechanism immediately adjacent to the magazine for feeding screws from the magazine, a foot for receiving the screws directly from the escapementmechanism and conveying them directly to the work, a screw driver for driving the screws into the work, a cam shaf a cam on the shaft for operating the escapement mechanism, a lever, a cam on the shaft for operating the lever. the screw driver being operatively connected to the lever, and a push rod operatively connected to the lever for lowering the, foot.

13; A screw driving machine including a magazine for containing screws, an escapement mechanism immediately adjacent to the magazine for feeding screws from the magazine, a foot for receiving the screws directly from the escapenient mechanism and conveying them directly to the work, a combined horizontal and vertical slide mechanism carrying the foot, a screw driver for driving the screws into the work, a cam shaft, a cam on the shaft for operatingthe escapement mechanism, a lever, a cam on the shaft for operat ing the lever, the screw driver being operatively connected to the lever, and a push rod operatively connected to thelever for lowering the slide mechanism.

14-. A screw driving machine including a magazine for containing screws, an escapement mechanism immediately adjacent to the magazine and including a pivoted segment and a feed slide for feeding screws from the magazine, a foot for receiving the screws directly from the escapement mechanism and conveying them directly to the work, a screw driver for driving the screws into the work, a cam shaft, a cam on the shaft for operating the segment, a camon the shaft for operating the feed slide, a lever, a cam on the shaft for operating the lever, the screw driver being operatively connected to the lever, and. a-

pnsh rod operatively connected to the lever for operating the foot.

15. A screw driving machine including a magazine for containingscrews, an escapement mechanism immediately ad acent to the ma azine: and including a pivoted segment and a feed slide for feedingscrews from the magazine, a foot for receiving the screws directly from the escapement mechanism and conveying them directly 'to the work, a combined horizontal and vertical slide mechanism carrying the-foot, a screw driver for drivin the screws intothe work, a cam shaft,

a cam on the shaft for operating the segment, a cam on the shaft for operating the feed slide, a lever, a cam on the shaft for operatzine, a foot for receiving the screws directly from the escapement mechanism and con veymg them directly to the work, a screw driver fordriving the screws into the work, a cam shaft, a cam on the shaft for operating the escapement mechanism, a lever, a cam on the shaft for operating the lever, the screw driver being eperatively connected to" the indexing device, and a push rod operative ly connected to the lever for lowering the foot.

In testimony that we claim' the above, we have hereunto subscribed our names,

"GRA G. BROWN. 1 GREGORY F. MGNULTY."

lever,anindexing device below the screw driver, a cam on the shaft for operating the

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