US519144A - white - Google Patents

Description

(No Model.) 5 Sheets-Sheet 1.

WHITE. HEEL NAILING-MAGHINE.

Patented May 1, 1894.

Fig.1.

WITNESSES.

INVENTOR 5/3 A-n'o msv.

THE NATIONAL umuunAPmNe coMPAnV.

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5 Sheets-Sheet 2.

(No Model.)

A. WHITE.

HEBLNAILING MACHINE. Patented May 1, 1894.

INVENTOR- ww BY W;

"3 ATTORNEY.

WITN EiSSES.

THE NATIONAL umosnmmma coMPANv.

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- (No Model.) 5 Sheets-Sheet 3.

A. WHITE.

HEEL NAILING MACHINE. No. 519,144. Patented May 1, 1894.

U y p g Q W I i WITNESSES. INVENTOR r BY A'n'oniusv.

(No Model.) 5 Sheets-Sheet 4.

" A. WHITE.

HEEL NAILING MACHINE.

Patented May 1, 1894.

INVENTOR ATTORN EV.

(No Model.) 5 Sheets-She1t5.

'A.' WHITE. HEEL NAILING MAGHINB.

No. 519,144. Patented May 1, 1894 ITNESSES.

4. ATTORNEY.

YR! NATIUNAL l.

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ALBERT WHITE, OF LOWELL, MASSACHUSETTS, ASSIGNOR TO SAMUEL 0. SMITH, OF SAME PLACE.

HEEL-NAILING MACHINE.

SPECIFICATION forming part of Letters Patent No. 519,14=4=, dated May 1, 1894. Application filed August 2, 1893- Serial No. 482,191- (No model.)

To all whom it may concern.-

Be it known that I, ALBERT WHITE, a citizen of the United States, residing at Lowell, in the county of Middlesex and Commonwealth of Massachusetts, have invented a certain new and useful Improvement in Heel-Nailing Machines, of which the following is a specification.

a rotary table which carries the clamps below reciprocating nail-drivers; devices which prevent the movement of the table while the naildrivers are in operation; devices which prevent the deposit'of more than one set of nails for each operation of the nail-drivers; devices which prevent the movement of the'nail-drivers, except when the rotary table is locked in proper position to receive said nail drivers; devices for releasing the clamp-carrying table after the nails have had time to fall and enter perforations in the heel; devices for preventing the reciprocating lifters from delivering nails into the conductors; devices for preventing the lifters being placed in operative position when at the highest points of their traverse unless sufficient time remains for the proper delivery of the nails into the conductors before the descent of thelifters;

devices for making holes or truing them if previously pricked in the heels at the proper distances from the edges of the clamp or heelholder; provision for allowing for slight variations of thickness in different heels intended to be of the same size and thickness, and said invention consists in the devices and combinations hereinafter described and claimed.

In the accompanying drawings, on five sheets, Figure 1 is a left end elevation of a machine constructed in accordance with said Smith patent and provided with my improvement; Fig. 2, a front elevation of the same; Fig. 3, a plan of the parts added by me and a section of the frame of the machine on the line 3 3 in'Figs. 1 and 2; Fig. 4, a central vertical section on the line 4 4 in Fig. 3, of the revolving table, the clamps which hold the heels, the head which receives the nail-conductors, the stationary table which supports the same,the stop-pin which prevents the rotation of the rotary table, the levers which keep the clamps closed, showing one of the clamps, the adjustable stem which raises said clamp,

the truing-up awls and their actuatin -eccentric, and a part of the central spindle and a part of the stem of another clamp in side elevation, showing also in vertical section the bar which supports the lifters and, in elevation, a jointed lifter-rod, part of a lifter and the arm which extends from said lifter-rod; Fig. 5, a vertical section of the bar which supports the lifters and the cam-shaft and a right side elevation of one of the lifter-rods; part of a lifter, the cam or wiper which strikes the arm of the lifter-bar and straightens the lifter-rod into operative position, and the stationary incline which receives a finger projecting from the lifter-bar in the descent of said bar and bends the lifter-rod out of operative position into the position shown in said Fig. 5 Fig. 6, a front elevation of the parts shown in Fig. 5, omitting the lifter and lifter-rod; Fig. 7;a right side elevation of the parts shown in Fig. 6, the cam or wiper having moved the lifterbar into its operative position; Fig. 8, a :front elevation of the lifter-bar, its arm and wiper,

the lifter-bar finger, the incline out of opera tive position and the cam which holds it out of operative position; Fig. 9, a detail of the clutch, partly in section; Fig. 10, a plan of the rotary-table and of the bolt which prevents said table from turning, the sleeve which supports said bolt, the spring catch which holds said bolt in engagement with said table, a part of the rod which connects said catch to the bolt-releasingdever and the bracket which supports said sleeve, said bolt being showninengagementwith said table; Fig. 11, a right side elevation of the cam which operates the nail-drivers, Fig. 12, a vertical transverse section of the sleeve and bracket which support said bolt and a right side elevation of said bolt, its disengaging spring and latch; Fig. 13, a vertical section on the line 13 13 in Fig. 3, of parts of the frame, the boltengaging lever, clutch-shaft, cam-shaft and fulcrum-shaft, showing in left side elevation the cam which operates the bolt-releasing lever, and the lever which locks the starting lever while the table is being turned, said levers, their springs, part of the clutch mechanism and the mechanism which disengages the catches or catch-levers; Fig. let, a front elevation of a part of the cam-shaft, its cam, the locking-lever and its spring, the bolt-releasing lever, its connecting-rod and latch.

The frame A, cross-girts a. a; the lifters O; throats D; flexible conductors E; main shaft or cam-roll shaft K, are substantially as shown and described in said Smith patent, the power being applied to the band-pulley A, fast on said main shaft, by a belt which is tightened by means of an idle-pulley supported on a slide R and movable on the slide bar 10 by means of a lever 70 pivoted on the frame of the machine, to press said idle pulley against the belt and to increase the friction of said belt on said driving-pulley, the lever 70 being held in this position by a spring-catch 70 in a well-known manner.

The nail-carriers consist of oppositely-inclined bars, arranged side' by side, grooved in their upper surface to receive nails and having an oscillating motion, as described in said Smith patent, which motion is quicker in one direction than in the other and causes the nails to travel always in the same direction on the same bar or nail-carrier, in such a manner that the nails are accumulated in a pool, there being as many such pools as there are pairs of nail-carriers, and there being in each such pool a lifter O by which they are raised one at a time and discharged into the flexible conductors E, of which there are as many as there are nails to be inserted in a single heel, the lower ends of all said conductors terminating in a perforated head or guide-block L, the perforations Z (Fig. 3) in which are arranged at the same intervals and in the same lines which the nails occupy in a completed heel, after the attachment of said heel to the boot or shoe. The lifters O are connected to lifter-rods, each formed in two parts 0 c jointed to each other at 0 the upper part 0 being jointed to the lifter, at c, and the lower part c of each lifter-rod being rigidly secured to the lifter-bar c and said lifter-bar being supported by lifter-levers G operated by means of grooved cams 0 fast on the cam-shaft 0 substantially as shown and described in said patent, but the lifter-bar c instead of being rigidly attached to the lifter-levers C, as shown in said patent, is free to turn in said levers in such a manner as to bring the lifters nearer to the lifter-bar and to prevent said lifters from risi high enough to raise the nails from the pools to the ,tops of the conductors E. I do not, however, claim this means of rendering the movement of the lifters ineffectual to raise the nails, as this is also the invention of the said Smith. Bending the lifter-rods, as above described, allows the feeding-devices of the machine to be run whether the centering and nail driving devices are or are not in operation and I have devised means of automatically turning the lifter-bar in its levers, to stop the feeding of the nails after each feed until the nails are driven to their proper places and until another heel is brought into position to receive nails from the head or guide-block L.

The speed of the cam-roll or main shaft K is necessarily high in order that the nail-carriers may be kept rapidly oscillating and supply the pools but the speed of other parts is not dependent on the speed of the cam-roll and is preferably much less. The cam-shaft 0 which operates the lifter-levers, as above-stated, is provided with a gear fast thereon,which engagesa pinion which is fast on and concentrio with a gear 0 the latter engaging a pinion 0 concentric with a band-pulley 0 said lastnamed pinion and said band-pulley being fast on said main-shaft. A belt 0 connects the pulley 0 with another band -pulley j which turns loosely on the clutch-shaft F. The lateral strain of the belt 0 on the main shaft K and clutch-shaft F is resisted by a pulley J which turns loosely on a stud j supported by a standj' secured to the frame A of the machine, said pulley J filling the space between said pulleys 0 andfand being rotated by frictional contact with them.

The pulley f has secured to it, concentri cally therewith, one member f of a clutch F, the other memberf of which clutch is fast on said clutch-shaft and carries a pin f which slides in said member f and is crowded by a spring f (see Figs. 3 and 9) toward the member f of said clutch. The memberfis provided with notches f any one of which is adapted to receive the end of the pin f to couple the clutch F and cause the shaft F to be rotated with the pulley f which has a constant rotation.

The clutch F is normally held open by a wedge 77. secured on an arm n of the startingshaft N, said starting-shaft having another arm or starting-lever n and said arms n n being rigidly secured to said shaft N. (Figs. 2, 3, 13 and 14..) The outer or rear end of the arm n is connected by a link 02 to alevern pivoted on a bracket a supported on a stationary table or horizontal part a of the frame A, said lever 17. being actuated by a spring n to draw, by means of the link 77. the arm 'n and wedge ndownward until said arm and wedge strike upon the top of the clutch-member f so that when the free end of the starting-lever n is pushed backward and let go, the wedge is lifted allowing. the

pin f to engage one of the notches f causing the shaft F to make one revolution, that is, to turn until the wedge n uncouples the clutch F. A stop f (Fig. 13) prevents the startinglever from being bent by being pushed too far back.

ITO

Immediately belowtheclutch-shaft Fis arranged a rotary table (see Figs. 1, 2, 3, 4, and 10) provided with as many heel-clamps 0' as there are operations performed on the heel by the machine and one additional clamp in which the heel is first placed, making in all four heel clamps arranged at equal distances from the center of said table and at ninety degrees from each other. These clamps are all alike each being secured by bolts 0 to the under surface of the rotary table proper 0 and each clamp being a rim having the general outline of a heel M and internally-tapered upward, to hold the heel firmly when said heel is crowded face upward into said clamp.

Each clamp is cut away in two places 0 0 to allow the thumb and fingers of the operator to grasp the breast and curved surface of the heel while in the clamp to facilitate the placing of the heel in the clamp. The table is perforated immediately above each clamp with a series of holes 0 equal in number and corresponding in arrangement and intervals to the perforations Z in the guideblock L. The rotary table proper o is on the samelevel as the stationary table a both having horizontal tops andthe table is secured to a central vertical shaft 0 which turns in a step 0 secured on a horizontal bed-plate a supported by hanging bracketsa secured to the under side of said stationary table a. To the shaft 0 are secured two horizontal plates 0 0 below the table 0, in which are guided the vertical rods P, four in number and each arranged below a heel-clamp.

plate o The upper end of each rod P is provided with a vertical round hole 19, in which is placed a stout spiral springp' and above said spring the stem p of the automatically adjustable pressure-plate 19 the object of said spring 9 being to allow the pressure plate to yield when a heel is slightly in excess of the proper thickness. plate 19 is secured a form 9 adapted to fit the concavity of the inverted heel. Each pressure-plate p is prevented from turning with respect to the corresponding heel-clamp by a vertical guide-rod p rig'idly secured to said pressure plate and extending down through and having a sliding fit in a hole 19 in the The rotary table proper 0 is provided with four holes 0 equidistant from the center of each table and from each other, each adapted to receive a stud g which projects downward from a retaining-lever Q, pivoted at q to a stationary part of the machine and raised by hand to allow said rotary table to be turned. When the; stud q is in any hole 0 one clamp and one pressure-plate are immediately below the head or guide-block. When the rotary table is thus locked one of the rods P is immediately over the pivoted cup 1' of the compound heel-clamping lever B, as shown in Figs. 1 and 2, said compound lever consisting of the lever r fulcrumed at r on a bracket a projecting from the under To the upper surface of the pressure side ofthe plate a and jointed at its front,

end at r to the upper endof another lever r which has its fulcrum atjr at the upper end of a link 0", the lower end of which link is pivoted to a stand 4 secured to the flooron which the machine stands. of the lever r has a lateral projection W, on which the foot of the operator is placed to raise the cup r and thereby the rod P and force a heel placed on the form 10 into the corresponding clamp. When any pressure-plate is thus raised to the proper, height, it is there retained bya knuckle catch-lever S or lever formed in two parts 8 s', the'lower .s' of which is fulcrumed at its lower end in ears 0 on the plate 0 and thrown toward the rod P by a spiral spring 8*, connecting an ear 8 on said part 8 to:

tical ad'ustin screw 8 b ressin upon J s Y c which, by the means hereinafter stated, the lever S is bent at the joint 5 and the lower part of said lever is turned, against the resistance of the spring s sufficiently to crowd the shoulders from under the collar p and allow the rod Pand the parts supported thereby tofall or be pushed downward until the pressure-plate rests on the rubber or elastic The lower end i cushion 0 supported upon the plate 0 or on i the upward projection 0 from said plate. Each collar 19 is adjustable on its rod P, as,

by an internal screw-thread p in said collar and a corresponding external thread p on said rod, to vary the highest position of the corresponding pressure-plate for heels of intentionally different thicknesses, slight variations in heels intended to be of the same thickness being provided for by the springp above described. When each collar 10 is properly adjusted, it is held in place bya setscrew 10 (Fig. 4), turning radially in said collar and thrusting against said rod P. When a heel M has been placed inthe heel-clamp which for the time being is at the front of the machine, the lever Q is raised, the rotary table 0 with the other parts supported by the shaft 0 is turned, by hand, ninety degreesto the left of the operator, to bring said heel vertically under the awls T, said awls being equal in number to the series of holes 0 immediately above said heel and being then arranged with each awl directly over one of said holes. The awls are secured in the horizontal lower face of an awl-holder t,

to which a vertical motion is givenby an eccentric t fast on the clutch-shaft F, said awlwhich surrounds a horizontal stud t rigidly secured to said slide, said sleeve having a screw-threaded shankt which may be turned in said strap t after removing said sleeve from said stud 15 to vary the distance which the awls shall penetrate the heel. Asingle revolution of the clutch-shaft Fcauses the awls to enter the heel through the holes 0 and to be withdrawn from said holes, the awls making the holes in the heel to receive the nails or, more generally, truing the holes made when the lifts are pushed together to form the heel. When the awls have trued the nail-holes in the heel and the clutch-shaft has stopped another heel is placed in the heel-clamp, then at the front of the machine, and the rotary table is again turned ninety degrees to bring the heel first clamped under the guide-block L and the second heel under the awls T and the clutchshaft is again given one revolution, causing the awls to enter the second heel, as above described, and at the same time straightening the lifter-rods and causing the lifters C to feed a nail to each nail-hole in the first heel.

The lifter-rods are straightened by means of a cam or wiper 0 fast on the clutch-shaft F (see Figs. 1 to 8), striking an arm e rigidly secured to the lifter-bar c in the rear of said cam 0 and turning said lifter-bar in the lifter-levers 0' from the position shown in Fig. 5 to that shown in Fig. 4. When the lifter-bar c descends after feeding the proper number of nails for one heel, said bar is turned in the lifter-levers C by the lower end of a finger 0 rigidly secured to said bar and projecting vertically downward therefrom, striking on the top of an incline 0 and sliding forward thereon. The incline 0 is supported on a vertical spring 0 secured on the stationary table a and notched at e to admit the clutch-shaft F, as shown in Fig. 1' and by dotted lines in Fig. 5. The upper part of the spring 0 and the incline 0 are pushed laterally (to the left in Figs. 2, 3, 6 and 8) just before said wiper G strikes the arm 0 bya cam e which is fast on said shaft F and crowds against a pin 0 which projects laterally from said spring c and thus prevents the breaking of the finger 0 or arm 0 by the resistance of said incline 0 and the pressure of said wiper on said arm 0 and enables the lifter-bar o to be partially rotated as above described.

The spring 0 extends above the incline 0 for a distance at e to prevent said incline from being thrown toward the wiper too far to be struck by the pin and on top is so cut away, at 0 as to allow the lifter-bar to be turned from the position shown in Figs. 4 and 7 into the position shown in Fig. 5.

After the first heel is supplied with nails and the second heel is operated upon by the awls T, the rotary tab1e,a third heel having in the meantime beeninserted in the heelclamp nearest the operator,is turned ninety degrees, bringing the first heel under the loop a by a sleeve u, surroundinga horizontal stud a and having a screw-threaded shank u which turns in said loop a and may be adjusted therein, just as the shank t is ad j usted in the eccentric strap i above described, to vary the distance to which the nail-drivers U descend. To give a reciprocating motion to the nail-drivers U, the cam to, fast on the clutch-shaft F, is provided with a cam-groove M which receives a stud a projecting laterally from the loop u or an anti-friction roll u turning on said stud of. The sides of the opening 21. of the loop a are vertical and are far enough apart to admit the clutch-shaft, by which said loop is guided vertically. The cam 11 and its groove to are best shown in Fig. 11, where said cam is represented in the position it occupies when the nail-drivers U are at their highest, or when the stud u is in that part n of said cam-groove farthest from the clutch-shaft. As the cam u rotates, the stud of first approaches the clutch-shaft, driving the nails into the heel, the nails reaching the proper depth when said stud is in the part 4.1. of the groove a and then recedes from said clutchshaft raising the nail-drivers for a short distance as the part n of the cam-groove approaches said stud, and then suddenly approaches said clutch -shaft, being nearest thereto when said stud is in the part M of said cam-groove, causing the nail-drivers to strike a quick blow on the tops of the nails in the heel below and forcing said heel out of its clamp, the pressure-plate 19 above described, having previously dropped away from said heel, while said stud u was in the part to of said cam-groove. The pressureplate 10 is allowed to fall by the bending of the knuckle catch-lever S, above described, under the pressure of a finger, adj ustably secured on and projecting laterally from the lower part of the vertical releasing rod 5 on the adjustingscrew s above described. Said rod 8 is guided in vertical holes in the stationary table a and bracket a and its finger s is normally held out of contact with the adj llStllilg-SGIBW s by a spiral spring 3 surrounding said rod and attached at one end to a collar .9 on said rod s and at the other end to the under side of said stationary table. The finger 8 projects through a hole a in one of the brackets-a (see Figs. 2, 3 and 13) and the upper end of said rod is extended backwardly, at under the clutch-shaft and is forced downward by a pin 8 which projects laterally from a collar f 6 fast on the clutchshaft F, to release the pressure-plate as above described.

The rear end of the lever n above-desupported on the stationary tableafiand is forced upward by aspiral springn surrounding said bolt n and compressed between said table a and a shoulder a on said bolt. The rp tary table Ois provided, with four holes 0 other and so that when the clamps are in proper operative position one of said holes 0 will be directly below said bolt and said bolt ,may be forcedinto said hole by pushing back the starting-lever n and thereby depressing the rear end of. said lever n, and unless one of said holes 0 is under said bolt the clutch-shaft cannot be started. When the bolt n is pushed down into a hole 0 it of engagement with the is retained therein by a spring-latch n the lower end of which is bolted, at n, to said sleeve and the upper end of which latch is provided with a hook 41 which enters an annular notch n in-said bolt. The upper end of the spring-latch n is connected by a link 12. to the front end of a lever n pivoted at n on the frame A, the rear end of said lever 12 being moved by a projection n on a cam N secured on the cam-shaft 0, once in every revolution of said shaft, in such a manner as to draw said spring-latch out of engagement with the bolt 72 when the bolt is thrown out table by the spring n The cam N is so arranged on the camshaft 0 that the bolt it, after being engaged with the rotary table, is not released until, by the action of the lifters, nails have been fed and sufficient time has elapsed to allow said nails to enter and pass through the guideblock L into a heel placed thereunder. Another lever N is pivoted, at n, and is held against the opposite face of the cam N from that which operates the lever n by a spring 11 and the front end of said lever N is bent laterally at a, (see Figs. 2, 3 and 13) in such a manner that when the projection 92 presses against the rear end of said lever N the front end of said lever is thrown behind the startlng lever 72? and prevents said starting-lever from being pushed backward. The action of the projection n on the lever N prevents the operation of the starting lever during that portion of the movement of the cam-shaft o which immediately precedes the return or downward movement of the lifters, when there would not be time enough to permit the nails to slide off the lifters before the beginning of such downwrd movement. This is .neces sary because there is always a nail on each lifter and the starting of the clutch-shaft immediately causes the lifter-rods to be so straightened that when the lifters reach the highest point of their traverse the nailswill slide from said lifters into the conductors E and if the lifter-bar c is already at the highest point of its traverse, the straightening of the lifter-rods will raise the lifters high enough arranged at ninety degrees fromeach forward past saidbent end in order that the wedge n may open the clutch and allow the clutch-shaft to stop when the starting lever, by accident, has been caught by said bent end of said lever N I I claim as my invention 1. The combination of a table, a clamp, supported thereby, a rod, arranged below. said clamp, a pressureplate, a spring arranged between said rod and pressure-plate, a lever, arranged below said rod to force said rod and pressure-plate toward said clamp, and a spring-actuated catch to engage a projection with which said rod is provided, to prevent said rod from moving awayfrom said clamp, as and for the purpose specified.

2. The combination of a table, a clamp, supported thereby, a rod, arranged below said clamp and movable therewith said rod being externally screw-threaded, a pressure-plate,

carried by said rod, a lever, arranged below able said collar to be adjusted on said rod,

and a spring-actuated catch to engage said collar, as and for the purpose specified.

3. The combination of a table, a clamp, supported thereby, a rod, arranged below said clamp, a pressure-plate, a knuckle catch-lever, provided with a shoulder to engage a projection, with which said rod is provided, and a spring to hold said catch-lever against said projection, as and for the purpose specified.

4. The combination of the table, having nail perforations and on its under surface provided with a clamp, adapted to hold a heel below said table and said nail perforations, a rotary shaft, a cam fast on said shaft, nail drivers, arranged in line with said perforations and caused to have a reciprocating motion by the revolutionof said cam and shaft,

a pressure-plate arranged belowsaid clamp, it

a rod, carrying said pressure-plate and adapted to be raised to force said pressure-plate against a heel in said clamp, a spring-actuated catch, to engage a projection with which said rod is provided and to hold said pressure-plate against said heel, a vertically-slid ing releasing-rod, provided with a finger, a spring normallyholding up said releasingrod, and a pin carried by said shaft and adapted to strike and force downward said releasing-rod and to disengage said catch and allow said pressure-plate to be forced downward by the pressure of said nail-drivers, as and for the purpose specified.

5. The combination of a movable table, a shaft, a clutch, one member of which rotates with said shaft and is movable longitudinally thereon, a constantly rotating pulley, loose on said shaft and carrying the other member of said clutch, a spring, normally closing said clutch, a starting lever, adapted to hold said clutch open and to be moved to allow said clutch to be closed, a bolt and a fixed support in which said bolt is adapted to be moved by said movement of said starting lever to enter a hole, with which said table is provided, when said hole is in line with said bolt,and said table being arranged in the path of said bolt to prevent at other times such movement of said bolt and thereby to prevent said movement of said starting-lever, as and for the purpose specified.

6. The combination of a movable table,having a heel-clamp and a series of nail perforations, an equal series of nail drivers, arranged at equal intervals with said nail-perforations, a clutch-shaft, a clutch, one member of which rotates with said shaft and is movable longitudinally thereon, a constantly-rotating pulley, loose on said clutch-shaft and carrying the other member of said clutch, a spring to close said clutch, a starting lever, adapted to hold said clutch open and to be moved to allow said clutch to be closed, a cam, fast on said clutch-shaft to impart a reciprocating motion to said nail-drivers, when said clutchshat't is rotated, a bolt and a fixed support, in which said bolt is adapted to be moved by said movement of said starting lever, to enter a hole, with which said table is provided, when said nail-drivers are in line with the corresponding nail perforations, said table being arranged in the path of said bolt to prevent at other times such movement of said bolt; and thereby to prevent said movement of said starting lever, as and for the purpose specified.

7. The combination of a constantly-rotating cam-shaft, cams secured thereon, lifterlevers, operated by said cams, a lifter-bar pivoted in said levers, lifters, lifter-rods, connecting said lifters and said lifter-bar and each formed in two'fparts jointed to each other, an incline adapted to be struck by said lifterbar,toturn saidbarand tobend said lifter-rods, a clutch-shaft, a clutch, one member of which rotates with said clutch shaft and is movable longitudinally thereon, the other member of said clutch constantly rotating and loose on said clutch-shaft, a spring, to close said clutch, a starting lever, adapted to hold said clutch open and to be moved to allow said clutch to be closed, nail-drivers, a cam, fast on said clutch-shaft, to give a reciprocating motion to said nail-drivers, when said clutch-shaft is rotated, another cam, fast on said cam-shaft and another lever, moved by said cam to engage said starting lever and to prevent the movement of the same when said lifters are at the highest point of their traverse, as and for the purpose specified.

8. The combination of a constantly-rotating cam-shaft, cams secured thereon, lifterlevers, operated by said cams, a lifter-bar, pivoted in said levers, lifters, lifter-rods, connecting said lifters and said lifter-bar and each formed in two parts jointed to each other, an incline, adapted to be struck by said lifterbar, to turn said bar and to bend said lifterrods, a clutch-shaft, a clutch, one member of which rotates with said clutch shaft and is movable longitudinally thereon, the other member of said clutch constantly rotating and loose on said clutch-shaft, a spring, to close said clutch, a starting lever, adapted to hold said clutch open and to be moved to allow said clutch to be closed, nail-drivers, a cam, fast on said clutch-shaft, to give a reciprocating motion to said nail-drivers, when said clutch-shaft is rotated, and another cam, fast on said clutch-shaft and adapted to move said incline out of the path of said lifter-bar, once in every revolution of said clutch-shaft, as and for the purpose specified.

9. The combination of a constantly-rotating cam-shaft, cams, secured thereon, lifterlevers, operated by said cams, a lifter-bar pivoted in said levers, lifters, lifter-rods, connecting said lifters and said lifter-bar andeach formed in two parts jointed to each other, an incline, adapted to be struck by said lifterbar, to turn said bar and to bend said lifterrods, a clutch-shaft, a clutch, one memberof which rotates with said clutch shaft and is movable longitudinally thereon, the other member of saidclutch constantly rotating and loose on said clutch-shaft, a spring, to close said clutch,a starting lever, adapted to hold said clutch open and to be moved to allow said clutch to be closed, nail-drivers,a cam, fast on said clutch-shaft, to give a reciprocating motion to said nail-drivers, when said IOC clutch-shaft is rotated, and a wiper, fast on said shaft and adapted to strike a projection, with which said lifter-bar is provided, to straighten said lifter-rods, as and for the purpose specified.

In witness whereof I have signed this specification, in the presence of two attesting witnesses, this 15th day of July, A. D. 1893.

' ALBERT WHITE.

Witnesses:

ALBERT M. MOORE, MYRTIE C. MANSUR.

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