US1007180A - Machine for mortising pulleys. - Google Patents

Description

R. S. BROWN. MACHINE FOB MORTISING PULLBYS.

APPLIUATION FILED JUNI: 2, 1906.

COLUMBIA pLANoGlz/u'n co.,wAsmNG'roN, D. c.

R. S. BROWN.

MACHINE FOB. MORTISING PULLEYS.

APPLIoATIoH FILED JUNE 2, 190e.

Patented 061.31, 1911.

13 SHEETS-SHEET 2.

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67 Witnesses:

oLuMBlA PLANOURAPH C0.. WASHINGTON. n. c.

R.. S. BROWN.

MACHINE FOB. MORTISING PULLEYS.

cuLumum PLANOGRAPH co.. WASHINGTON. u. C.

R. s. BROWN.

MAGHINB FOR MORTISING PULLBYsg APPLICATION FILED JUNE 2, 1906. v 1 ,007, 1 80, Y Patented Oct. 31, 1911.

13 SHEETS-SHEET 4'. 0/

coLuMBlA PLANQGRAPH cu., WASHINGTON, D. c.

R. S. BROWN.

MACHINE POB. MORTISING PULLEYS.

APPLIOATION FILED JUNE 2, 190s.

Patented Oct. 31, 1911.

l? SHEETS-SHEET 5.

In venan' 247 Irowlz historney,

COLUMBIA PLANOURNH C0.. WASHINGTON. D. C.

R'. s. BROWN.v

MACHINE FOR MORTISING PULLEYS.

APVPLIATION FILED JUNE 2, 1906.

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Witnesses R. S. BROWN.

MACHINE F011 MORTISING PULLBYS.

APPLIOATION FILED JUNE 2, 1906.

Patented 0111.311911.

13 SHEETS-SHEET 7 Witnesses:

R S BROWN MACHINE POR MORTISIN G PULLEYS.

APPLICATION FILED JUNE 2, 1906. 1,007, 1 80, Patented 0011.31, 1911.

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13 SHEETS-SHEET 9.

BULUMBIA PIANOGRAFH C0.,WASIIINI1I'UN, D. C.

R. S. BROWN.

MACHINE PoR vIMIORTISING. PULLEYS.

APPLICATION FILED JUNE 2, 1906. 1,007,180, Patented 001;. 31, 1911.

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MACHINE FOR MORTISING- PULLEYS.

APPLICATION FILED JUNE 2, 1906.

1,007,180, Patented 001;.31,1911.

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. Patented Oct. 31, 1911.

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11. s. BROWN. MACHINE FOR MORTISING PULLEYS.

APPLICATION FILED .TUNE 2, 1906.

. 1,007,180. Patented oet. 31,1911.

UNITED STATES PATENT OFFICE.

ROBERT s. BROWN, OE NEW BRITAIN, CONNECTICUT, AssIo'NoR TOVTHE lBRITAIN MACI-IINE COMPANY, OE NEW BRITAIN, CONNECTICUT, A CORPORATION OF CON- NECTICUT.

MACHINE FOR MORTIsING BULLEYS.

iiaeiicedoct. s1, T9711.

Appiieation filed June 2, i906. serial No. l319,878.

To all whom it lmay concern:

ing is a specification.

of wood-pulleys.

It is of common knowledge vthat :manyefforts have been made to produce a nicelybalanced wood-pulley, and in one system of manufacture this has been attempted lby first gluing together the segments of the: rim, then boring the shell thus formed, and. sawing it through in a manner to receive.

the spokes, said spokes being Vdisposed flatwise to the plane of rotation of the wheel, and, therefore, causing great air-resistance and a disposition of the timber in arms orv spokes in a manner to afford the least:

strength. In another method of manufacture the arms or spokes are placed edgewise to the plane of rotation of the vpulley where they have the least air-resistance and afford great strength, and in this method the spokes have generally been placed in position while the process of gluing the segments is under way,-the arms or spokes being thus built together. the pulley is completed, and the arms or spokes being in place will preclude the turning or boring of the inside of the rim, and, therefore, a perfectly balanced pulley will not be formed. Various other processes have 40 been tried for manufacturing pulleys of the character described, but they have either been impracticable, or have been too eX- pensive.

By the system of manufacture for which the present machine has been designedV a pulley with a perfectly-balanced rim is produced, and this is accomplished by first boring the inner side of the rim, then chucking said rim on the mo'rti'sin'g-machine and making the mortise for two or four sets of arms (more if desired) in said rim, subsequently sawing the rim apart for insertion of the tenons of the arms or spokes, and then turning the periphery truly concentricwith the inner side of the rim. The improved In this method method of y manufacture is not, however, claimed in the present application.

Among the objects of the present invention is the provision of improved indexingmechanism whic'h l-will control Athe position of the pulley-rim or blank Vin such a way that the number and locationof the `{mortises c i made therein may be accurately regulated This invention relates to mortising-ma-I chines many of the features of which are ofi general utilization in the art, although pri- Y marily designed for use in the manufacture .chain is also reduced by a slippage'o'f the driving-belt due to undue resistance of said cutter-chain.

A further object of the invention is the provision of means for actuating the head in which. the cutter-chain is mounted instead of the table for facing-purposes.

Other objects of the invention relate to various combinations of cO-acting elem-ents, Aand to ldetails of improvement all of which will be hereinafter described.

In the accompanying drawings, Figure l is an end elevation of a mortising-inachine involving my improvements. Fig. 2 is a sideelevation ofthe machine looking in the direction of the Varrow A. Fig. 3 4is a front elevation of the upper portion of the machine, certain parts being omitted and others shown in section. Fig. 4 is a side elevation opposite to that shown 'in Fig. 2 'certain parts being broken away and Others shown in section. Fig. 5 is a side Aelevation of a pulley, showing the spoke or cross-bar. Fig. 6 is a partial sectionof the pulley. Fig. 7` is a plan view of the pulley, showing the m'ortises therein. Figs. 8, 9 and l0 coinbined, constitute a longitudinal vertical section of the machine, showing the feedscrew, the chuck, and means for actuating the chuck-jaws, etc. Fig. 11 is a sectional View illustrating the end of the llower shaft of the machine opposite to thatshown in Fig. l, showing av means of lubrication and other details hereinafter lset forth. Fig. l1a is a side elevation ofthe eccentric-bushing, shown in section in Fig. 1l. 12 is a partial horizontal section taken on 'line 1 2, 12 of Fig, 2. Fig. 13 is a detail view of the chain-tension mechanism and parts carried thereby'. Fig. 14 is a detail 'section of the same showing more clearly the parts involved. Fig. 15 and Fig. 16 are detail views in edge elevation and plan, respectively, of the chain-bar. Fig. 17 is a detail in section of means for securing the chain-bar, head er slide after it has been adjusted. Fig. 18 is a partial front elevation of the chuck, parts being in section. Fig. 19 is a detail view of one of the chuck-jaws. Figs. 20, 21 and 22 are detail views of the chipebreaker, Fig. 20 being in section on line 20-20 of Fig. 21. Fig. 23 is a` bottom plan view of the indeXing-mechanism parts being in section. 24-2-1- Fig. 23; and Fig. is a section taken on line 25%25 of Fig. 23; Figs. 26 and 27 are, respectively, side and plan views of the chuck; Fig. 27a is a diagram showing in profile the cam carried by the chuck and cooperating with the indexing-mechanism; Fig. 28 is a plan view of one of the chuckjaws and its extension; Fig. 29 is a plan view of the chuck with the face-plate removed; Fig. 30 is a side elevation of the chuck-jaw and its extension, shown in Fig. 23; Fig. 31 is a partial front view showing the chain and chain-bar and the guardrail and chip-breaker. Fig. 32 is a detail of parts of the mechanism for actuating the Like numerals designate similar parts throughoutthe several views.

Referring to the drawings, the numeral 1 designates the frame of the machine, which may be of any desired type and is illustrated as a column rising from a base 2, and having bolted to its top a head 3 provided with a laterally extending arm 4.

1n adjustable bearings 5 of the frame or column 1 is mounted a driving-shaft 6, provided at one end with fast and loose beltpulleys 7 and 8, the belt being adapted to be shifted by the usual shipper 9 of any approved form, and rod-and-lever mechan ism 9-92 connected thereto. (See Figs. 1 and 3.) Rigid with the shaft 6 is a large pulley 10 over which passes a belt 11, while loose on the shaft 6 is a stepped cone-pulley 12 driven by a belt 13 in a manner hereinafter described. 1n engagement with a pul ley 14 constituting part of the cone-pulley 12 is a crossed belt 15, while rigid with the shaft 6 at the side opposite the cone-pulley is a belt-pulley 16 over which a straight belt 17 passes.

1n adjustable bearings 18 in the base 2 of the machine is journaled a driven shaft 19, said shaft carrying looselyanounted thereon a pulley 20, over which the straight belt 17 passes, and a loose pulley 21, which is driven by the crossed-belt 15. A clutch 22 of any approved kind is splined to the shaft 19, and is actuated by a yoke 23 projecting from a rock-shaft 24 journaled in the base, said rock-shaft having a lateral arm 25 on its opposite end by which it is operated in a F V2-lis a section taken on line manner hereinafter described, and said arm 25 having a head 25 for a purpose herein after stated.

At one end the shaft 19 projects into a chamber 26 of the base 2 containing lubricant (see Fig. 11), and is journaled in an eccentric bushing 27 having a flange 27 provided with sockets 28 in which a tool. may be inserted for turning said bushing. A spiral gear 29 is splined to the shaft'19 and itenters the lubricant 30 as said shaft rotates, and a ball-bearing b1 is located intermediate said worm and the inner end of the bushiilg. A lubricaut-conveying chain 32 is mounted in a groove of the shaft 19, and the extreme end of said shaft bears against a grooved thrust-block 33.

Designated by 34 is a shaft, stepped upon a ball-bearing 35 which is supported upon a bracket 35 between the hub of said bracket and the hub of the spiral-gear 36, secured to the shaft 34 and with which the spiral-gear 29 engages. Said shaft 34 passes through the hub of bracket 35 and on its end is threaded to receive a nut 352 to prevent vertical displacement thereof. A covering-plate 37 is bolted to the open side of the chamber 26 and carries a valve or faucet 38 for drawing off the contents of said chamber (see Fig. 7 A screw 39 is inserted through the wall of chamber 26 and the point of the screw enters a V-shaped groove 40 in the hub of the eccentric bushing 27.

Referring to Fig. S, in the top of the chamber 26 is an opening 41 closed by a cover 42, and through this opening lubricant may be supplied to said chamber. A screw 43 is fitted in a groove 44 of the column 1, being journaled at its upper end in an overhang 45 of said column, and is rigid with the shaft 34 at its lower extremity, said screw engaging a nut 46 carried by a slide 47 gibbed to ways 48 and 49 of the column, and said column being longitudinally grooved as stated (Fig. 8) to permit travel of the nut. Slide 47 is provided with a way 50 and has a chamber 51` and on this way is fitted for transverse adjustment a slide 52 gibbed to said way, as illustrated in Fig. 8, said slide 52 having a tubular hub 53. For adjusting the slide 52 any desired means may be employed, and shown for this pun pose are a rack 54 secured to slide 47 and a pinion 55 rigid with a tubular shaft 55. Fitted for rotary movement on the slide 52 is a chuck face-plate 56, gibs 57 securing it in place, and said face-plate having a series of radial slots 58 for the reception of the bases 59 of chuck-jaws 6() projecting laterally from said slides, as shown in Fig. 13.

From what has been stated it will be manifest that the chuck has a movement up and down on the frame or column 1, and that it may be shifted from left to right to place the pulley-rim in a new position for enlarging a mortise already made by a second cut of the chain hereinafter described,- this right and left movement being produced by the rack and pinion set forth, and said movement being limited at either side by adjustable set-screws 61 carried by brackets 62 rigid with the slide 47,-said setscrews being illustrated in Figs. 3, 26 and 29. In the outer face ofthe slide 52 are sockets disposed in the illustrations given quartering about the circular periphery of the slide upon which the chuck-faceplate 56 is secured by the gibs 57, as before stated. Secured to the chuck-face-plate 56 in Figs. 8 and 18 is an arm 64, said arm having at its inner end a series of projections 65, through which screw-bolts 66 pass. This arm is of a shape in cross-section shown in Fig. 18, and is provided at one end with a longitudinal bore 67 for the reception of a sliding rod 68 having a manipulating knob 69 at its outer end and a locking-dog 70 at its inner end, said locking-clog being adapted to fit in any of the sockets of the slide 52, and to thus lock said slide and` chuck-faceplate together, after an indexing movement has taken place, as will be hereinafter described. Between a collar 71 on rod 68 and bushing 72 threaded into the arm 64 is mounted a coiled spring 73, the function of which is normally to propel the rod and its locking-dog inward, and, therefore, to cause the chuck face-plate to be locked to the slide 52. In another longitudinal bore of the arm 64 is mounted a tubular shaft 74 having a hand-wheel 75 at its outer end, and a beveled gear 76, rigid with its inner extremity, said bevel-gear being located in a bore 77 of the hub of the chuck-face-plate, and said gear intermeshing with pinions 78 (see Fig. 27) rigid with the screws 78 for actuating the chuck-j atv-slides 59, and thereby simultaneously shifting said slides either toward or from the axis of the chuck-faceplate.

Mounted within the tubular shaft 74 is another tubular shaft 55 carrying the pinion 55 heretofore described at its inner end and provided with a hand-wheel 80 atits outer end, thereby affording means for adjusting the slide 52 transversely of the slide 47, the limit of adjustment being regulated in either direction by set-screws 61 heretofore described. Mounted in the tubular shaft 55 is a pull-rod 81 provided at its inner end with an enlargement terminating in a coneplug 82 which normally rests within a centering socket 83 in the slide 47, as illustrated in Fig. 8. A button 84 is secured to the outer end of the rod 8l, and a spiral-spring 85 is located between a collar 86 on the rod, and the inner end of the bore in the tubular shaft 55, said spring serving normally to advance the pull-rod, illustrated in Fig. 8,

'sition.

At its inner end the hub of the chuck faceplate 56 has rigid with its surface a cana 87 and coperating with said cam is a roller 88 journaled in an arm 89 "secured to a rockshaft 90 mounted in a bracket 91 and in the slide 52. Upon this rock-shaft 90 (see Figs. 1, 2, 3 and 32) is splined the hub 92 of an arm 93, said arm having an internallythreaded socket adapted to receive the threaded shank of a ball constituting one member of a universal oint, said ball being fitted within socket 97 carried by the rod 98, equipped at its upper end with a socket 99 receiving the ball which is rigid with the rod 101, and, therefore, constituting another universal joint. On the reverse end of the rod 101 is a grooved sector 101 adjusted in the larger sector 102, said sector being splinedupon the index-controllingrod 103. A bracket 104 having a vertical arm is bolted to a flange of the slide 47 and this bracket is provided at its upper end with a head 105 provided with perforated ears 106-106 for the reception of the rods 103 and 110. A sliding connection is established between the sector 102 and rod 103 by a spline and feather as illustrated in Figs. 3 and 32. At its lower end the rod 103 is provided with a bifurcated block 103', said block being perforated to receive the lower end of the rod passing through an arm 107, said arm being positionedbet-ween the ears of the bifurcated block and projecting from a shipper-dog 108, secured by a screw 109 to a rod 110. At its inner end this 'shipper-dog 108 is of yoke-shape, and in the arms 111, 111 of the yoke are fitted adjustable stops 112, 112 equipped with nuts 113, 113 by which they may be adjusted, said stops being located opposite the head 25 of the arm 25, secured to the rock-shaft 24 above described.

Designated by 114 is a treadle pivoted on a shaft 115 journaled in a bracket 116 of the base 2, and this treadle is connected in any desired manner to the rod 110. A collar 117 is secured to the rod 110, and surrounding said rod between said collar and a perforated bracket 118 projecting from the base 2 is a coiled spring 120. This rod 110 passes through the head of the bracket 104 projecting from the slide 47, and enters at its upper end the perforated armv121 of a bracket 122 rigid with the overhanging arm 4 of the head 3.

A stop 123 is adjustably secured by a screw 124 actuated by a sliding handle 125 to the rod below its upper end, and another stop 126 is adjustably connected to said rod by a screw 127, operated by a sliding-handle 128 at a point on said rod beneath the head 105 of bracket 104. Figs. 2 and 3.)

(See

As illustrated in Fig. 2 a coiled spring '129 is connected at one end to a pin 180 of the rocking-rod 108, and at its opposite extremity to a stud 131 of the head 3. Adjacent Ato its upper end the rod 108 passes through a bearing 132 of the bracket 182 projecting from the arm 4 and above said bearing said rod is provided with a lockinghead or dog 188 consisting of two separated arms 183, 13S-32 (see Figs. 28, 24 and 25) coperating with an index-plate 134 hereinafter described. A perforated plunger bracket 1235 (see Figs. and 23) is secured to the top of the arm 4 by screws 186, and through the jvierforation in said bracket passes a plunger 187 swiveled upon a bolt 188 passing through ears 139 of a lever 140 pivoted at 141 to the side of the arm 2, as illustrated in Fig. 4.

Referring to Figs. 2, 8, and 12, designated by 142 is a rod to which the lever 140 is pivoted at 140, said rod passing through a bracket 143 bolted to bracket-arm 144 secured to the outer end of arm 4, and depending below said arm. Stud- shafts 145 and 146 project from the depending part 144 of said plate, and on the stud-shaft 145 is loosely mounted a gear-wheel 147, carrying rigid with its outer face a disk 148 provided with a series of slots or grooves 149, each open at its outer end. Sleeved on the stud-shaft 146 is a wheel 150 to the hub 151 of which is secured a manipulating-wheel or disk 152 having handles 153, and in the inner side of said wheel 152 is formed an oblong cam-groove 154, shown by dotted lines in Fig. 3. fit its lower end the rod 142 is flattened at 142 and in said flattened portion is formed a slot 1422 which fits over the stud-shaft 145, a nut 155 on said shaft securing it in place, and a washer 156 also on the stud-shaft, separating said flattened portion of the rod from the disk 148. Ad jacent to its lower extremity the flattened portion 142 is provided with a roller-stud 157 which enters the cam-groove 154. Pins 150 extend inward from the wheel 150 and are adapted to enter the slots 149 in the disk 148 when said wheel is turned.

Designated by 158 is a slip-gear mounted on the hub 159 (see Fig. 12) of a disk 159 secured tothe end of a shaft 160, said disk having curved slots 1592 through which screw-bolts 161 pass to engage the gear 158, the function of said slip-gear being to change the relation between the hand-wheel 152 and the movable head carrying the mortis ing mechanism, as will hereinafter appear. A screw 168 is formed on shaft 160, said screw passing through the arm 4, and engaging a nut 164 rigid with a cutter-carrying head or carriage 165 movable in a guideway 166 of the head 8 of the column and the arm 4. See Figs. 5 and 12. Carried by this head and journaled in a bearing-bracket 167 thereof is a sliding shaft 168, provided with longitudinal grooves 169 which re receive splines or feathers 170 from a bushing 171 secured by screws 172 or otherwise, to a comparatively wide, flanged beltpulley 173.

Designated by 174 is a sleeve or bushing lixedly secured in a bearing 175 of the machine-top by screws 176 the pulley being bushed at 177 to rotate on said sleeve and being prevented from displacement longitudinally by a flange 178 on the sleeve 174 and the end of the bearing 175. To the bearing 175 is secured a fixed collar 179 fitted against the right hand end of said bearing, and projecting from said collar is a shield 174, provided at its end with a closure or knob 180, for the shaft 168. On the extreme inner end of the shaft 168 are xed a sprocket-wheel 181 (see Figs. 12 and 14) and a collar 182, and between said collar and a reduced end of the bearing 167 is secured to said bearing by screws 188 a fancase 183 for the reception of a suction-fan 184 of usual construction rigid with the shaft 168. `A hood 185 hinged to the fancase at 185 surrounds the end of the shaft 168, said hood communicating with said fan-case in the usual manner.

An endless cutter-chain 186 is driven by the sprocket-wheel, and passes over rollers 187 and 188 (see Figs. 15 and 16) j ournaled on roller-bearings 189 in the lower end of a chain-bar 190, said chain-bar being secured at its upper end to an adjustable block 191 by screws 192. Depending from the bearing-bracket 167 (see Figs. 14 and 17) is a grooved hanger 198, and in a socket of the block 191 is fitted a shank of a T-headed bolt 194, the head 194 of which fits in a groove 195 of said hanger. In this bolt is formed a conical depression 195 for the reception of the conical end 196 of a screw 197 threaded into the block 191, and having a finger-grasp or hand-wheel 198, said bolt serving to lock the block to the hanger after it has been adjusted. In a lateral extension 199 of arm 199 rising from the bearing 167 of head 165 is journaled a screw 200 having a hand-wheel 201, and below said handwheel a bevel-gear 202, the thread of said screw engaging a socket in a cross-section 208 connecting standards 204 rising from the block 191 sothat said block 191 may be raised and lowered on the head and then secured in place by the screw 197.

Journaled in bearings 205, 206 (see Figs.

3 and 4) of laterally-projecting arms 205 199 of the head is an inclined shaft 207 carrying a bevel-gear 208 at its upper end and a hand-wheel 209 at its lower extremity, whereby the screw 200 and the block 191 may be actuated to regulate the tension of the cutter-chain either by the wheel 201 or the wheel 209, the latter owing to the height of the machine being brought down within convenient reach of the operator.

Later-ally extending from the slide-block 191-one at each side thereof, are arms 210, 211', each having a head 210-211, respectively, perforated to receive devices hereinafter described. Sliding in the perforated head 210 (see Fig. 31) is a guard-rod or bar 214, while in the opposing head 21.1 of arm 211 is fitted for sliding movement a rod 215 of a chip-breaker-head 216 secured to the end of said rod by a screw 217. These rods 214, and 215 are connected by a curved yoke 218 having perforated hubs 219 through which said rods pass, and in which they are adjustably secured by screws 220, one of which is shown in Fig. 13.

From the yoke projects an arm or table 221, and on the rod 215 of the chipbreaker, above said table, are sleeved weights 222 which may vary in number and normally tend to force the yoke` and its attached rods downward to cause the chip-breaker to bear against the work under yielding pressure, as set forth in my Patent No. 673,378 dated May 7, 1901, to which reference may be had.

Referring to Figs. 20, 21, and 22 it will be seen that the head or block 216 is provided with a socket 216 in which the end of rod 215 is secured by a pin 2232, and is also provided with a rectangular opening 2162 for the reception of the chip-breaker proper 223 which comprises a bar of wood or other suitable material inclined at its inner end at 223 to rest upon the work adjacent to the mortise being formed and prevent the upper edge of said mortise from being damaged by splintering or breaking adjacent to the upper run of the cutter-chain. In the opening 2162 of the head 216 is placed an inwardly-flanged metal bar 224 from the forward end of which projects a chute 225 for receiving the shower of chips or cutting removed by the cutter-chain and directing them toward the hood 185 of the fan-case 183. This bar merges at its lower end into the chute 225 for which it constitutes a reinforce, its side 224 bears on the outer surface against the wall of the opening 2162, and on its inner surface against the bar or stock 223, and its flange 2242 is located intermediate the tcp of the stick and the upper wall of the opening 2162. Threaded into the block 216 a screw 217 having a knurled head 227, and by turning said screw its inner surface may be made to bear against the bar 224 and t-hus force the stick 223 laterally against the wall of the opening in which it is placed to clamp it firmly in position, in vir.- tue of which the screw will bear upon said metallic arm instead of directly againstthe stick as in the old constructions. By loosening the screw the chip-breaker may be readily adjusted back and forth, and as the end of the screw is always forced against a metallic part of the fixture no damage can be done to the wood of the stick.

As heretofore stated the belt 11 from the pulley 10 of the shaft 6 actuates the pulley 173, and on the inner end of said pulley 173 is a small stepped pulley 173 for driving the belt 13 and stepped pulley 12 loose on said shaft 6. As has also been stated a crossed belt 15 is driven from the element 14 of the loose pulley 12 and drives a pulley 21 loose on shaft 19 journaled in the base 2, while a pulley 16 rigid with said shaft 6 operates a straight belt 17, and, through said belt, a pulley 20 loose on said shaft 19,--said pulleys 2O and 21 being alternately connected to the shaft by the clutch 22, or permitted idly to rotate thereon when the clutch is thrown to a neutral position. It, therefore, appears that the shaft 19 is driven in the feed direction by belting operated from the shaft 168 kwhich drives the cutter-chain, and as said `shaft 19 actuates the spiral-gearing described the screw 43 is also operated either to advance or withdraw the slide 47.

lVith the use of slight chain-bars in making small mortises, it has been found in practice that through over feeding of the work-support, the encountering of a knot or other unusual resistance, or the employment of adull cutter-chain, there is a tendency to force the feed more rapidly than the cutterchain can stand, and, hence, the chain-bar will spring or wabble and an imperfect mortise will be formed,-this condition being aggravatedwhen the main driving belt supplying power to the cutter-actuating; shaft slips, while the feed-mechanism driven from another source keeps in motion. In the `present constructionthe feed-mechanism is driven by belting from the cutter-driving shaft or spindle, and, hence, the feedingspeed will be reduced whenever, due to the unusual conditions specified the speed'of the cutter-chain is reduced. In other words, by controlling the speed of the feed-mechanism by the speed ofthe cutter-driving shaft a proportionate relation is always maintained between the two, so that said cutter drivingshaft will always be effective in driving the shaft 19 of the speed-mechanism in a manner entirely to avoid all of the above-noted objections.

Designated by 227 (Figs. 28 and 30) are I extension chuck-jaws, each comprising a base 228 having a perforated bracket 229 depending therefrom through which the screw 78 passes and acts as a guide lfor said extension-jaw. A bolt 230 secures said eX- tension-jaw to the mainjaw 60 at a point about in line with the top of the slide 59, and each extension-jaw is reinforced and channeled at 231 toreceive its slide 59, and is provided at its outer end with a serrated face 232 having at its lower end a lip-oriange 232' against which the edge of the pulley-rim rests. Stop-screws or pins 233 (Fig. 1S) prevent the chuck-jaw-slides 59 from running oit their act-uating screws when spread to the full limit of their movement. 1n each end of the slide 47 a V- shaped recess l17 is formed, leaving intermediate each recess an arm G2 of the slide 47, each carrying the bracket G2 for the stopscrews 61. (See Fig. 29.)

Re'verting toA the indeXing-mechanism (see Figs. 23, 24: and 25) a protect-ing cover 234 is secured to the plate 134, and adjacent to the inner edge ot said plate is a line of perforations 235 and a longitudinal slot 236 for the reception of a sliding bar 237, having a knob 23S by which it may be manipulated to cut out the desired number of perorations as illustrated in Fig. 23. Plate 134 and its hood or cover are adjustably secured to the slide 165 by bolts 239 passing through slots 240 in the plate. A longitudinal slot 24:1 is formed in the index-plate 134, and in each edge of said slot are concave seats or depressions 242 and 243, the pairs of which are separated by projections 244 on one edge and 245 on the opposite edge, the seats and projections being located in opposing pairs diagonally opposite each other. In the slot is loca-ted the reduced part 1333 of the indexing-dog 133, the prow jections 133 and 1332 of which being, when the rod 103 is in the position shown in Figs. 24 and 25 above and below the indexingplate.

Pulleys of the kind to be mort-ised in this machine are composed of plies of wood glued together in a manner to break joints around the circumference of the rim, these plies in the illustration Figs. 5, 6 and 7 being indicated in a nine-ply pulley by the letters a, 7), o, (Z, e, f, g, 7L, and i, although said pulleys may be of any desired diameter and may be composed of any required number of plies.

Referring to Figs. 4, 6, 7 and 31 the pulley-rim to be mortised is illustrated, and is indicated by the numeral 246, the plies being marked by the letters a, Z), etc., above set forth. After the pulley-rim has been mortised at points directly opposite each other in each alternate ply as at 7a, Z and fm, in the illustration given, it is sawed apart on the line 247 for the reception of the tenons 248 of the spokes, kerts or slots 249 separating each pair of tenons, and serving to permit free passage of air. Each half-spoke 250 is provided with a pair of separated perforations 251, on each side of the half-groove 252 of the spoke-section for the reception of bolts 253 for securing the halves together to form the complete pulley, the bolts carrying nuts 254e at each end which bear against washers 355 and wood strips 356 beneath said washers.

lVhen the tenons 24S of each spoke-section have been glued in their mortises, the halves of the pulley are placed together, and firmly clamped in place by the bolts and nuts described, the result being a perfectly-bal anced pulley the spoke or spokes of which are of a construction to al'lord the maximum of strength and the least air-resistance when the pulley is in use. While but one spoke is shown any suitable number of spokes crossing each other may be employed if desired,

the ends thereof being mortised into ditlerent plies ot the pulley. For instance if two spokes or arms were employed they would preferably cross at right angles, their tonons extending into alternate plies. Thus it a second arm were to be added to the pulley shown, its tenons would be mortised into plies c, e, and g. 1n a case ot this kind. it is apparent that circumferentially adjacent mortises occur in alternate plies and it is to insure this disposition otA said mortises that certain features about to be described are associated with the indexing mechanism.

Shown in section in Fig. 8 and projected to show the profile in Fig. Q7a is the cam 37 which as the chuck is rotated by hand controls the movement of the indexingmechanism, the face of said cam being in contact with the roller 88 carried by the arm 39 pinned to the shaft 90 as stated. Referring to said Fig. 27" this cam is equally divided into two high and two low portions separated by inclined surfaces as 37, 372, 373, 874, and 375 thus making the changes 90 degrees apart or in other words the two low portions and the two high portions are respectively diametrically opposite each other. In preparing a pulley for one arm it is clearly apparent that the mortises therefor are made diametrically opposite in the saine plies and that the various positions ot' the tool-head for forming said mortises in one side of the pulley will exactly correspond with the proper positions for forming those in the opposite side. Now it.' a second arm is to be added its receiving mortises will be half way between, both circumferentially and longitudinally, the mortises for the iirst arm. As stated the roller S8 is always in contact with the cam-surface, and when the chuck tace plate 5G is in any one of its locked positions said roller will be in Contact with either a high or a low portion ot the camsurface. From this it follows that it the chuck is given a half reif'olution. as would be done to form diametrically opposite mor tises for a pulley having one arm, the relative position of the cam-roller 83 will remain the same and consequently the head 133 cooperating with one of the series of notches in the index plate 134 to govern the positioning ot head 165 will not be aii'lected, if however the chuck is given a `toni-th of a revolution, as would be done to form quartering mortises for a two arm pulley, the cam-roller will be moved to its eXtreme relative position thereby shifting the head 133 to coperate with the opposite series of notches in the index plate 134 which will so affect the positioning of head 165 as to bring the circumferentially adjacent mortises in alternate plies.

In the operation of the machine a pulleyrim 246 is placed upon the chuck-jaws 60 or the extensions of said jaws 227, as determined by the diameter of said rim, and the wheel 152 is then turned to actuate the screw 163 through interposed mechanism and adjust the sliding head 165 to the proper position to bring the cutter-chain 186 and chain-bar 190 to a point opposite the ply in which the first mortise is to be formed. If a fixed relat-ion existed between the gears 147 and 158 there would be no certainty that the step b'y step movement imparted to the head 165 by the mechanism described, would bring the cutter-chain into exact alinement with the desired ply, but the adjustability of gear 158, obviously provides means whereby the proper relation to secure the desired alinement may be readily obtained. As soon as the head is positioned by the wheel 150 whose pins enter the slots 149 in disk 148, the rod 142 is actuated by the cam 154 of wheel 152 thereby pulling` down the outer end of the pivoted lever 140, and causing the pin 137 at its opposite extremity to enter the perforaf tion 235 then opposite said pin, and to lock the parts in place. Vhen this operation has been properly carried out and the pulleyrim is in correct position the treadle 114 can be depressed, to pull down the rod 110, the shipper dog 108, and the rod 103.

sliding head has been brought to the correct place the arms 133 1332 of head 133 will occupy the position illustrated in Figs. 23 and 24, and will pass freely through the slot 241 and the groove 243, and thus will not impede the downward movement of the rod 103, but if said arm should be in a wrong position a block will occur and the treadle can not depress said rod to shift the clutch and start the feedmechanism in action. Assuming the parts to be in correct position the treadle will be depressed and through the connections described will pull down the rods 103, 110, rock the shaft 24 and shift the clutch 22 into engagement with the pulley 21, and the crossed belt 15, actuated by the means described from the cutter driving-spindle 168, will now rotate the shaft 19 and the spiral gear 29 of said shaft will rotate the spiral gear 36 which actuates the screw 43, thereby imparting an upward movement to the slide 47 and forcing the pulley-rim 246 into contact with the cutterchain 186, thus forming a mortise in the ply b of said pulley, as illustrated in Fig.

, tions already performed. If the indexing-plate 134 carried by the 31, the presser-foot or chip-breaker being in contact with said ply at this time and performing their usual functions until said mortise is completed. As the slide 47 moves upward it carries with it the bracket 104, and when the head 105 of said bracket engages the adjustable stop 123 of rod 110 it will raise said rod, and through the shipperdog 108, ship the clutch to a neutral position to stop the feed after which said clutch may be manually or otherwise suitably operated to reverse the feed so as to lower the work away from the cutter chain. As the rod 110 is elevated the rod 103 moves with it and the head 133 moves through the indexing-plate 134 and will release said plate for a further indexing-movement of the toolhead to bring it into position for forming a mortise in the alternate ply CZ of the pulleyrim. By rotating the wheel 152 the mechanism associated therewith is actuated to rotate the screw 163 sufficiently to bring the sliding head, its cutter-chain and chain-bar to a position opposite the ply (Z above mentioned of the pulley-rim, and if this position is a correct one the treadle may again be depressed lto repeat the operation, and so on until the four mortises are formed in the upper part of the pulley-rim,-each mortise being made in an alternate ply of said pulley-rim as stated.

After a series of mortises suitable for the pulley-rim being acted upon has been formed it becomes necessary to rotate the chuck and the pulley thereon one-half turn or in other words to bring a new part of the pulley directly opposite said mortises in position for an exact replica of the opera- To accomplish this the knob 69 is grasped and the rod 68 is pulled outward to release the locking-dog 70 from the slot or groove 63 in the manner stated, and said rod will remain in a withdrawn position while t-he chuck and pulley are rotated about the circumferential periphery of the slide 52 sufliciently far to bring the other part of the pulley into position for correct mortising-operation. W'hen said rod is released the spring 73 will immediately force it forward to cause the locking-dog again to engage a slot or groove 63 of the part 52. During the rotation of the chuck to effect this changed position of the pulley the cam 87 is also rotated, and through the rock-shaft 90 and ball-andsocket connections described will rot-ate the shaft 103 to bring the head 133 in proper position with relation to the index-plate 134, which position, when the mortises are to be diametrically opposite as in this case, will correspond with the original position. The mechanism associated with the chuck and coperating with the index-plate 134 insures the proper relative positioning of the pulley-rim and cutter-chain head, therefore

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