US1045717A - Machine for inserting fastenings. - Google Patents

Description

F. L. MACKENZIE.

MACHINE FOR'INSERTING FASTENINGS I Patented Nov. 26, 1912.

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APPLICATION FILED B.8, 19b9- Lmmm I fif/TAZZSSZS. M

am 6% a M I. L. MAOKENZIB. MACHINE FOR INSEETING EASTENINGS.

I I AFPLIGATION FILED YEILB, 1909, 1,@45,7 1 '7 Patented Nov. 26, 1912.

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, am 4M4 $3 6. 47/ m F. L. MAGKENZIE. MACHINE TOR INSERTING FASTENINGS.

APPLICATION FILED PEILB, 1909. V 11,945,717. Patented Nov. 26, 1912.

5 SHEETS-SHEET 4.

F. L. MAOKENZIE. MACHINE FOR INSBRTING FASTENINGS.

I APPLIUATION FILED PEB.8, 1909. I 1,045,717. Patented Nov. 26, 1912.

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FRED L. IMAGKENZIE, 013 BEVERLY, MASSACHUSETTS, ASSIGNOR TO UNITED SHOE MACHINERY COMPANY, OF PATERSON, NEW JERSEY, A CORPORATION OF NEW JERSEY.

MACHINE FOR INSERTING FASTENINGS.

Specification of Letters Patent.

Patented Nov. 25, 191 2.

To all whom it may concern- 1 Be it known that I, FRED L. MACKENZIE, a citizen of the United States, residing at Beverly, in the county of Essex and State of Massachusetts, have invented certain Improvements in Machines for Inserting Fastenings,of which the following description, in connection with the accompanying drawings, is a specification, like reference characters on the drawings indicating like parts This invention relates to machlnes for inserting fastenings and particularly to machines for inserting previouslyformed fastenings. As herein used the term fastening is intended'to include within the scope of its designation things havingother than fastening. functions,but which are adapted to be handled by machines of the type to which this invention particularly relates.

Efficient fastening inserting machines are in use in many arts, the machine herein illustrated being intended especially for use in the manufacture of boots and shoes, but the'commercial success attending the use of i such machines is dependent, to a great extent, upon two things, namely: the speed at which the machine performs its work and the rapidity with which the work may be presented to the machine. Of these two elements of commercial success the latter depends for the mostpart upon the skill and quickness of the operator. The speed of operation, however, is a resultant of the organization and construction of the machine as a whole and in this respect machines in commercial use are not entirely satisfactory, forithe reason'that, owing to the low speeds at which they must be run, their capacity for performing work is inferior to the demand made upon them by the average operator and seriously handicaps the best operators.

A general object of the present invention, therefore, is to provide a machine for handling previously formed fastenings which may be run at speeds higher than those attainable with machines of known construction. I A further object of the invention is so to improve the construction of machines of this type that they will be adapted for performing not only an increased quantity of work but also a superior quality of work.

Another object of the invention is to provide a machine which is adapted to be run at high speed and yet which is so constructed and arranged that there is a minimum of vibration and a minimum of wear.

Other objects of the invention relate especially to improvements in the construction and operation of the various elements which go to make up a machine of the type known as loose nailing machines, that is, a machine adapted to handle previously formed nails in bulk and comprising usually a nail driving mechanism, a hopper, a raceway for conducting nails from the hopper to a point adjacent to the driving mechanism, a separator for separating the endmost nail from the others in the line in the raceway and delivering it to a nail receiving throat which constitutes, usually, a partof the driver passage, and an awl for forming a nail receiving opening in the work and having usually, and preferably, the further function of feeding the work between successive nail driving operations. It will be understood however that many of the objects of the invention hereinafter pointed out relate to improve ments in fastening inserting machines in general.

An important object of the present invenhas been put under tension by the upward movement of the driver. It is impracticable, however, to employ a spring in a machine designed to run at very high speed since the spring cannot be relied upon to bring the driver into proper cooperative relation to the other parts of the machine at the proper time.

In some fastening inserting machines, a cam has been employed to effect the recip rocation of the driver but it has been found in practice that the operation of cam con- The present invention aims therefore tov provide the positive control advantages of a cam-actuated driver with the impact driving atl *antages of a spring-actuated driver. To this end a driver actuating mechanism has been provided which insures the arrival of the driver at a predetermined point atthe.

blow instead of a shove, but. which a ll also cause a se ts-d or settingblow to be we to the fastening whereby pro er and 'i iif'ot-ni insertion of the tastenings in the work may be insured.- v, w y

In the illustrated embodiment of the invention the foregoing objects are attained by the provision of a driver actuating cam of noveldesign which may conveniently be: described as a momentum cam and which is so constructed that it will cause the driver to travel at not less than a predetermined minimum velocity to an intermediate pointin the driving direction determine positively the location of that point and free the driver thereat to continue its driving movement by momentum and which is further so const-r'ucted that it insures a movement of the driver to a predetermined limit'in the driving direction. Said cam is preferably so constructed also that it controls positively the action of the driver during all parts of its movement except as hereinabove described when it releases said driver to travel under its acquired momentum and thereby drive the fastening with a blow.

An improved means for clearing the rapeway which is herein. shown will. not be claimed in this case, this means having been made the subject-matter of a co-pending application Ser. No. 663,014 filed Nov. 29, 1911.

Still other objects of the invention will be apparent from a consideration of the disclosure in this application of the preferred embodiment of my invention.

In the accompanying drawings,Figure 1 is a side elevation of a machine embodying the preferred form of this invention; Fig. 2 is a front elevation of the head of the machine;'Fig. is a. side elevation of the machine head viewed on the left hand of an observer standing in front of the machine; Fig. 4. is a perspective view of the mechanism for moving the throat and separator in proper time relation to each other; Fig. is a detail sectional view showing the connections between the throat and separator; Fi 6 is a perspective view of'the awl depth controlling mechanism; Fig. 7 is a detail peri daofim is a detail side elevation, partly broken away, of the improved raceway clearer acttiatin mechanism; Fig. 9 is a detail perspective the locking mechanism constituting a pa. of the horn operating mechanism; Fig. 10 is a detail section of the yielding connection between the avvi depth controlling mechanism and the horn release mechanism. g The illustr'a machine has a supporting frame comprising a base 2-, a standard coluinn and a .lie'ad (3. In the base are moimted a counter shaft 8 to which is tached a pullef 10 connect-ed to any siiit; 1% source of power and the hoifn' depressing clutch operating treadles llaiid 14 respectively. The counter shaft 8 also carries a second pulley rigidly attached toit and, boil-t net-ted by a belt 16 to a loose pulley isttpeii the main driving shaft 20 inths head '6. In the upright'portion of the frame or standard 4 are mounted the work sup o'rt or horn 2? and the horn release cont-re ing mechanisfn'i' h reinaft'er more specifically described.

In t e head 6 are mounted the various parts of the fastening inserting mechanism and the cams which control the timing of the operations of the various parts of the machine as a whole. Inasmuch as the illus-v trated machine is of the type known as loose nailing machine, for the purposes of this de scription the term nail will be used in;- stead of fastening in describing the various parts of the fastening inserting mechanism and the various operations performed by the machine.

'The fastening inserting or nail driving mechanism comprises a driver bar 24 mounted to reciprocate vertically in a guideway in an upright part 26 of the machine head and having clamped to its lower end a driver 28. At its upper end the driver bar 24; is provided with an adjustable stop 30 which impacts in the movement of the driver upon a cushion 32 surrounding the driver barand contained in a countersunk opening in the upper end of the part 26. Upon its rearside the driver bar 2-1- is provided With rack spective ot the driver operating Fig. 8

teeth 34 which are engaged by the teeth of I a segment rack 36 carried upon the sub'stane tially. horizontal arm 38 of abell-crank lever pivoted at 40 upon the machine head. The other arm d2 of the bell-crank driver operating lever carries a cam roll 44 which travels in a cam groove 46 formed in a cam wheel 48 mounted upon the driving shaft 20.

The driver operating cam is of peculiar construction. and as hereinabove suggested may conveniently be described as a momentum can]. The cam groove 46 is provided with opposed Walls 50 and which are parallel throughout the greater part of their extent so that both the upward and downward movements of the driver are substantially positively controlled throughout the iii greater part of the reeiprocatory movement rt said driver. in ordeig however, to provide a inonientinn or bloivdike driving of the nail the positive control of the movement o? the driver by the cam is preferably rel" predetermined part of the nu inent d driver, and this relaxation of i' -nti'ol or ease of the driver will preferably take place during the latter part of its dowiiii'ai'il movement or its movement in the nail driving direction,

Preferably, however, the control of the rain over the movement of the driver will he maintaineijl to the extent that the driver v-{ili be compelled to move at not less than a predetermined velocity throughout the whole of its i'lriving movement and will he compelled to move to a predeterini ad limit in the driving direction. To this end the ail of the groove 46 will be given a cam shape, such thatit will compel the movement of the driver at not less than a pi-eiletermined speed in the event that the momentum of the driver is not sufficient to carry it at a greater speed. To permit the driver to travel at a greater speed than that at which it would be caused to travel by the con'ipelling action of the side or wall of the cam groove 46, the wall or side is so shaped that. there is a. recess or pocket 54 in the. groove 46 into which the rain roll may be carried as Llie iiuinentinn oi the driver bar and driver causes it to niov away from the wall 50. It will be noted that the "ill 50 of the cam groove it; inipels the dri er in its downward direction and prevents too; rapid movement of the driver in the upwarddirection; and that, on the other hand, the wall 52 serves to effect the upward in veinent of the driver but resists too rapid movement in the downward direction except: as hereinabove described when the driver has reached a predeterinineiil point in its downward movement when the control otthe wall 52 over the downward movement is interrupted by the provision of the recess or pocket 54.

it will be noted further that after the driver and driver bar have been permitted to descend under their acquired momentum, which may conveniently be referred to as the acquired lllt'llllelltlllll of the driver. the Q wall 50 of the train groove again comes into mntact with the cam roll H and causes the f driver to deliver upon the head of the lasi second or setting blow in the event- I that the driving blow has not sunk the head I slot 94.

toning a to the proper depth.

The nails to be driven are contained in a hopper 56 from which they are conducted by 1 5 ed to slide in a vertical. guldewav in an awl a raceway :78 to a point adjacent. to the driver passage in the driver guideGO, said guide being broken away at the side adjiitp i 100 arranged to slide in a similarly shaped cent to the raceway whereby the nails may way into said driver passage. Below the driver guide (30 is a nail receiving throat 62 mounted upon a slide (3-1 and movable with said slide transversely to the path of feed of the work and transversely to the raceway 58. Transverse n'uiiveinent of the throat 62 and slide (34 is provided to withdraw the throat from the path of feed movement of the awl (36, hereinafter to he described, in order to permit the aw] to bring the nail receiving opening which it has formed in the work beneath the driver passage.

The slide it is guided in an opening in the machine frame and is provided at its rear end'with rack teeth 68 with which engage the teeth upon a segment rack '70 upon the lower end of a slide actuating lever 72 pivoted at H: on the machinehead and-carrying at its upper end a cam roll 76 entering a cam groove 78 in the cam wheel 48, said cam groove 78 being so shaped as to effect movement 'of'the throat 62 into operative position and to withdraw it out of the path of the awl at the proper times in the cycle of operations of the machine.

The nail separator 80 is also mounted upon the slide 64 to move therewith and is yieldingly connected with said slide so that on the return movement of the slide 64 the separator may move relatively to said slide in the event that it meets an obstruction. in the raceway. The connections between the separator and slide comprise a cylindrical slide 82 upon which is mounted a bracket 84:

priivided with a forwardly projecting por tion 86 to which the separator blade 80 is attached. 1- The bracket 84 is adjustable upon the slide 82 in a direction substantially parallel to the movement of the awl, so that the separator may be adapted to nails of varying dimensions.

machine head and has socketed within it a spring 88 which bears at one end against the end of a socket in the slide 82 and at its other end against the end of a socket in a second cylindrical slide 90 mounted within the slide 82. i 4

The slide 90 is provided with a pocket in which is received a lug 92 extending up from the slide 64, a slot 94 being provided in the 'slide 82 whereby said slide may move relatively to said lug to permit the separator to yield when it meets an obstruction. The spring 88 tends. normally to keep said slide 82 in such relation to the slide .64; that the lug 92 will hein the 're'arend of the The awl (this clamped in an aivlbar-QG which has a straight vertical portion mountearrying frame 98. said frame 98 being pro- Vltlttl' with ahorizontal dove-tail portion slideway formed in a bracket 102 bolted to The cylindrical slide 82 is guided in a cylindrical openlng 1n the the machine head. The awl bar 96 is arrangedto reciprocate vertically in its carrying frame 98 and to be moved llOI'lZOIltally with said frame. The mechanism for effecting the horizontal movement of the frame 98 comprises a floating lever 104 provided with a guideway 106 in whichis slidably mounted a fulcrum block 108 pivoted vupon a stationary fulcrum pin 110 carried cooperates an indicator on the fulcrum pin carrying block 11.1. At its upper end the floating lever 104 is provided with a cam roll 116 traveling in ajcam groove 118 formed in the rear face of the cam disk 120 mounted upon the forward end of the main driving shaft 20." v Upon the rear face of its vertical portion the awl bar 96 is provided with rack teeth with which engage the teeth upon a segment rack carried upon one arm 122 of an awl operating lever. The awl operating lever is fulcrumed upon a rock-shaft 124, being provided with a sleeve 125 which surrounds said rock-shaft. operating lever is attached to the inner end of the sleeve 125 and the other arm 126 is attached to the other end of said sleeve.

The arm 126 of the awl operating lever comprises a casing in which is mounted a slide bar 128 broken at 130 into two separable sections, the lower section 1280 being provided with rack teeth which mesh with the teeth of a pinion 132 carried at the outer end of the rock-shaft 124 and the upper section 1281 receiving through 'an'opening in the back of the casing which forms the arm 126 a pivot pin 134 upon a block 136 arranged to be moved vertically in a lever 138 pivoted at one end at'140 to the machine head and at its other end carrying a cam roll 142 which enters a cam groove 144 in a cam wheel 146 on the main shaft 20.

Thelever 138 is provided with a" spring socket 148 in which iscontained a spring 150 which holds the block 136 yieldinglv in its lowermost position. Thepower which operates the awl to cause it to penetrate the work being transmitted to the arm 126 of the awl operating lever through the lever 138, the effective length of the arm 126 is therefore varied by varying the vertical position of the fulcrum pin 134.

In order that the Work penetrating movement of the awl may be proportioned to the The arm 122 of the awl thiclmess of the work, mechanism is provided for automatically varying the vertical position of the fulcrum pin 134 in accerdance with the thickness of the work. This mechanism comprises a lever 152 attached to a rock-shaft 154 having hearings in the machine head, said lever carrying at its for-- a pinion 158. see Fig. 3, upon the inner end of the rock-shaft 124. The rear end of the ward end a segment rack 156 which 'ei'igagcs 1 The horn release mechanism herein shown is substantially the same in its construction and princi le of operation that shown n the co-penc ing application of George Goddu, Serial No 409,352, filed Jan. 4, 1908, except that the mechanism herein shown is mounted in the column 4 to operate in. the reverse direction from that in which the mechanism in the co-pending application operates. In the illustrated construction the slide 162 is norn" ally depressed into its lowermost position by a horn raising and work clamping spring 164 hearing at its upper end against a cross-piece in the column 4 and at its lower end being received in an annular socket 166 surrounding and clamped upon a threaded rod 167 connected to the slide 162.

The pressure of the spring 164 is transmitted to the horn 122 through connections comprising toggle links 168, 170 and a lever 172 fulcrumed in the column 4 and connected at its rear end to the toggle link 17 0 and at its forward end connected by a block and slot connection to a member 17 5 into which the horn supporting rod 174 is threaded. The lever 172 is forked at its forward end. The straightening of the toggle is effected through a link 176 connected at one end to the knee joint of the toggle and at its other end to one arn of a bell-crank lever 178, the other arm of ich is connected by a rod 180 to an arm of a second bell-crank lever 182. The other arm of the lever 182 carries a cam roll entering a cam slot 184 in the cam wheel 48. When the toggle is broken, the spring 164 is preferably locked against action upon Locate when the toggle is broken, said pawls being held out of engagement with, said ratchet when the toggle is straightened by the pressure of a finger 192 attached to the toggle link 168 upon the tails 19% of said pawls.

The horn may be depressed when the machine is at rest in order to place work upon it or remove work from it by suitable connections with the horn'depressing treadle 12, said connections comprising, in the illustrated construction, a rod 196 threaded at its upper end into a piece 197 having a pin and slot connection with a forked extension of 'themember 175, said rod being pivotally connected at its lower end to the treadle 12. The mechanism for automatically controlling the depth of penetratidn of the awl into the work has preferably only a limited range of movement, since when operating upon in the spring 164 and connected to the rod .work which is very thick it is unnecessary to vary the depth of penetration of the awl and therefore when the thickness of the work exceeds a predetermined amount the awl depth controlling mechanism-ceases to cause variations in themovement of the awl cor responding to variations in the thickness of the work. A stop 199 in the path of the segment carrying end of the lever 152 limits the movement of the awl depth controlling mechanism.

.In order that the free movement of the .horn may not be interfered with when the thickness of the work exceeds that for which automatic variation of the awl movements is provided, a yielding connection is provided between the rod 160'and the'slide 162 whereby when the rod 160 has reached the upperilimit of its movement, that is when it has set the a'wl operating mechanism to give the greatest amount of penetrative movement to the awl, the slide 162 may be moved relatively to the rod 160 to permit the horn 22 to accommodate itself to work of still greater thickness. This yielding connection comprises a socket 198 located with- 160 and having confined within it and hearing against the lower end of rod 160 a spring 200.

A second rod 167 passes through. an opening in the bottom of the socket 198 and w1thin said socket is provided with a piston 202 bearing upon the lower end of the spring,

The spring 200 is strong enough so 200. that the thickness of the work will be accurately gaged by the automatic controlling mechanism up to the maximum for which thismcchanism is efiective, and that beyond the said maximum it will be compressed to permit the relative movement of the slide 162 and the rod 160.

The downward movement of the slide 162 causes a positive downward movement of the rod 160 after the spring 200 has expanded sufficiently tobring the piston 202 into it that the part 1280 of the slide bar 128,-

as it rolls about the pinion 132, will tend tomove away slightly from the part 1281 and for this reason the slide bar 128 has been made in two separable sections in order that this slight downward pull may not afiectthe vertical posit-ion of the fulcrum pin 1.34. When the slideway for the block 136 in the, lever 138 and the slideway for the slide bar 128 are substantially parallel, any movement of the bar 128 caused by variations in the thickness of the work upon the awl since the parts are in what maybe called neutral position, and no tendency to turn is imparted to the arm 126 of the awl operating lever by the movementof the slide 128 when the parts are in this the angle between the slideway for the block 186 and the slideway for the slide bar 128 is zero. v

Since the position of the awl will not be affected by any adjustment of the awl depth controlling mechanism when the two slideways are in the position just described, the parts are preferably so timed that the movement of the horn back into work gaging position will take place with the slideways in this position and that the machine will stop with the slideways in this position. It will therefore be seen that the horn may be depressed by the treadle 12 to permit work t1) be placed upon it or removed from it with out any effect upon the awl.

The hopper 56 is attached to a counter shaft 201 mounted in a bracket 206 clamped to the machine head. Also mounted in this bracket is a second counter shaft 208 having a bearing 210 at the rear part of the machine head and having loosely mounted on its reaiuend a driving pulley 212- ina 'ieripheral groove in whichtravels a belt 211. 'The belt214c surrounds and travels in a peripheral groove in a hopper driving eX- tension 216 of the loose pulley upon the shaft 20 to which the belt 18 transmits movement from the counter shaft 8. This locse belt pulley is constantly rotated and is arranged to be clutched to the shaft 20 by any suitable clutch mechanism, preferably that disclosed in the co-pending application of George Goddu, Serial No. 476,649, filed Feb.

will have no eficct' neutral position, or in other words, when The loose pulley 212 may be clutched to the shaft 208 by any suitable clutch mechanism, such for example as that illustrated which comprises a cone 218 carried by a sleeve 220 surrounding the shaft 208 within the bearing 210, said sleeve being somewhat longer than the bearing 210 and having a flange upon its forward end between which and the collar 222 upon the shaft 208 is confined a spring 224which tends normally to cause the sleeve 220 to move the cone 218 into clutching engagement with the loose pul- 18}? 212.

The sleeve 220 may be moved against the tension of spring 224 to move the cone to effect an unclutching of the pulley 212 from the shaft 208 by'me'ans of a forked bellcrank lever 226, one arm of which bears against the fiange' of the sleeve 220 and the other arm of which is connected to an opcrating rod 228 extended to the front of the machine and provided at its forward end with a finger hold 230. Between the fork members of the bell-crank lever is a downwardly extending lug which coiiperates with stopmembers on the bearing 210 and limits the movement of said lever. Whenthe bellcrank 226 isin the position shown in Fig. 3,

the pulley 212 is unclutched from the shaft is noted that by this arrangement the hopper "forward end with a worm 232 which drives a worm-wheel 234 upon a cross shaft 236 extending between the shaft 208 and the shaft 204, said shaft 236 having at its other end 'a bevel gear meshing with a bevel gear upon the rear end of the shaft 204. A rotary raceway clearer 238 is mounted upon a third I counter shaft having bearing in the bracket 206 and is provided at its rear end with a belt pulley which is connected with a belt pulley upon the shaft 208.

In Fig. 8 is shown an improved raceway clearer operating mechanism. In this figure is shown also a different hopper actuating means, but it will be understood that the clearer actuating mechanism may be used equally with this hopper actuating means or with that shown in the other figures. Upon the shaft 208 is mounted a pinion 240 which meshes with an annular gear 242 formed upon the hopper. The shaft 208 has also attached to it a pin wheel 244 of a Geneva stop mechanism. The counter shaft upon which the raceway clearer 238 is mounted has attached to it the star wheel 246 of the Geneva stop mechanism. The pin 248 upon the pin wheel 244 entering successively the slots 250 in the star wheel 246 effects at each rotation of the shaft 208 one-sixth of a rotation of the raceway clearer 238. This intermittent movement of the raceway clearer 238 is very effective in removing the niisplaced nail from the upper end of the raceway, since the blow which it gives the misplaced nail is very quick and much more effective than v.thecontinuous movement of a constantly rotating clearing wheel.

When it is desired to adjust the tension of the spring 164 which operates to move the horn 22 into clamping relation to the work, the socket 166 may be adjusted upon the threaded rod 167. It will be noted that the portion of this socket which is threaded upon the rod 167 is split and provided with a set screw by which it may be clamped in adjusted position. ment of the spring to be effected more easily, an anti-friction bearing is provided for the spring in the bottom of the socket 166. This anti-friction bearing comprises, as illustrated, a washer 252 in the bottom of the socket and a washer 254 upon which the spring 164 rests, anti-friction balls 256 being provided between the two washers.

The operation of the machine is as followsf The parts being in the position shown in Fig. 1, at which time the awl depth controlling mechanism is in neutral position, and the toggle 168, 170 is straightened so that the spring 164 may act upon the horn 22, the pawls 194 being held out of engagement with the ratchet plate 186, the operator depresses the treadle 12 to lower the horn to permit the work to be placed there- To permit the adjust on, this depression of the treadle serving to} compress the spring 164 so that when the operator again releases the treadle the work will be pressed into engagement with the work abutment 258 adjacent to the fasten ing inserting mechanism. Thiswork clamping movement of the horn 22 operates through the connections 160, 152, 124, 132 and 128 to adjustthe fulcrum pin 134 so that the awl operating mechanism will cause the awl to penetrate to the proper depth for the thickness of the work clamped between the horn and the work abutment. The work having thus been placed in position upon the horn, the operator removes his foot from the treadle l2 and depresses the starting treadle 14. This treadle is connected by a rod 260 to suit-able clutch actuating mechanism not herein specifically illustrated nor described since it constitutes no part of the present invention, and is normally depressed by a spring 262 bearing at one end against the under side of the rearward extension of the casing or bracket 188 and at its other end upon a collar upon the rod 260.

Depression of the treadle 14 serves, through the rod 260, to effect a clutching of the constantly rotating loose pulley over which the belt 18 travels to the main driving shaft 20. The machine stops with the driver in substantially its lowermost position and with the cam roll 44 in the recess or pocket M of the driver cam groove 46,

as shown in Fig. 3. As the main shaft starts to rotate the driver is lifted until it clears the throat 62 and the throat 62 and separator 80 are then withdrawn simultaneously out of the path of the awl by the lever "feeds the work over the horn until the fastening' receiving opening which it has formed in the workis brought beneath the driver passage.

As the awl returns toits initial position j the throat and separator are moved back into their original positions and the separator acts to deliver a nail to the throat as the fastening receiving opening in the throat comes beneath the driver passage. The driver completes its upward movement after the separator has come into position to retain the nails behind that separated in the raceway and descends to drive the'nail immediately after the throat has come into proper relation to the driver passage.

It will be noted that the spring 150 serves to keep the section 1281 of'the slide 128 in engagement with the section 1280 when the slideways for the block 136 and the slide 128 are parallel, and that therefore the fulcrum pin 134 will be automatically adjusted for each thickness of the work clamped between the horn 22 and the work abutment 258,'this gaging action of the horn taking place at i the end of the work feed as the awl is Withdrawn from the work and as the parts of the awl depth controlling mechanism are returned into neutral position so that it has structed to control positively the action of said driver during a part of its driving movement and to permit to said driver independent mov'ement in the driving direction during another part of said driving movement.

combination With a reciprocating driver, of means for controlling positively the action of the driver during a portion of its recipro- 2. In a machine of the class described, the I -eating movement, said means being constructed to compel a predetermined driving movement of the driver while ermitting free travel of the driver in the riving direction during another portionv of the recip rocati-ng movement of said driver.

3. In a machine of the class described, the. combination with a driver, of means for 1mparting to said driver a predetermined being constructed to movesaid driver with amount of driving movement, said means,

a positively predetermined velocity during a.

said driver a velocity in the driving direction greater than that of said means during another portion of its movement,

combination with a driver, of meansffor actuating said driver, said means being 0011* structed to controlpositively the action of the driver durmg a part offits movement portion: of its movement and to permit to' 4. Ina machine ofthe class described, the

i and then to permit the driver to travel under its acquired momentum and yet to compel its travel to a predetermined point duringanother part of its movement.

5. In a machine of the class described, the

means connected with said driver including a cam roll and a cam wheel provided with a cam slot within which the cam rollis confined for the eater partof the rotation of said Wheel, sald slot having an enlarged portion in the region compelling extreme de scent of the driver whereby the driver is free to move under its acquired momentum. in completing its driving'movement'.

combination with a driver, of operating 6. A machineof the class described, hav ing in combmation, a driver and means for 1 actuating said driver constructed to cause it to travel at not less than a predetermined.

no direct effect upon the position of the afivk fi imum velocity to an intermediate point g If the treadle 14 is kept depressed by the operator several nails will be driven in rapid succession. When the treadle let is released the machine will automatically complete the cycle of operations necessary to drive a nail and will stop with the parts in the relation above described and which is shown in Fig. 1.

Having described my invention, what I claim as new and desire to secure by Letters Patent of the United States is 1. In a machine of the class described, the combination with a driver, of means for operating said driver, said means being conin the drivlng direction, to determine post-1- tively the location of that point. and t0 freemachine of-the class described, havits movement in the driving direction,to 1 1 permit said driver to travel under its acquired momentum through the balance of its movement in the driving direction and then to act uponsaid driver insuch mannenthat it causes it to effect a setting action upon the head of the driven fastening.

8. A machine of the class described,'having in combination, a driver and a single means for actuating said driver constructed to operate twice upon the driver during its driving movement, between which operations the driver is free to travel under its ing if'se latter part of its movement in the driving direction. g

10. In a machine of the class described, a driver and means for actuating said driver comprising a member connected with said driver and an angularly movable member,

said two members being connected with provision for independent movement in such parts only of the angular movement of said; angularly movablemember that the driver will he caused to travel at a positively-pre. determined velocity to an intermediate' -point inv the driving direction, and willthen be freed at that point to continue its-driving movement by momentum.

11. In a machine ortithe class described, a

,' reciprocating driver and means forreciproeating said driver constructed to .control positively the movements of said driver" throughout the greater part of its reciproeating movement, said means having provision for free movement. of said driver under the action of gravity and its acquired momentum during the latter part of its movement in the driving direction.

12. A machine of the class described, having incombination, mechanism for inserting. fastenings, an awl, means for positively operatingsaid awl comprising a lever having a segment rack engaging the awl bar, a second lever having an adjustable conned" tion with said first lever whereby the effective throw of said first lever may he means varied and mechanism for adjusting the said connection in accordance with the thickness of the work arranged to operate through the center of oscillation of said first lever,

13. A machine of the class described, having in combination, mechanism for inserting fastenings, an awl for forming fastening receiving openings in the Work, means for operating said awl, and means for varying the efi'ective throw of the awl operating means comprising a lever connected at one end with the work support, a rock shaft upon which a member of the awl operating means is sleeved provided with pinions at each of its ends, a segment gear at the other end of said levermeshing with one of said pinions and a fulcrum adjusting slide oar forming a part of said awl operating means ,and provided with a. rack meshing with the other of said pinions.

14:. A machine of the class described, having incombinatiori, mechanism for inserting fastenings, anawl-and an'awl bar having rack teeth, mechanism for. positively op 'erating said'awl comprising a lever carrying upon one arm a segment rack) engaging the rack teeth upon the' awl bar and cariryingyingits otherarmfa fulcrumadj'ustilng. slide and means for operating said slide' having--an' -a xis coinciding with that efzsaid lever.

I [15. 'Aimachine of the class describ having incombiriation, mechanism for'in erting fastenings, an a;wl for forminga fastening receiving opening in the work, means for positively operating said awlcomprising a lever'having one arm pivotally connected with .said-awl, an dvhaving in its other arm aslide formed of a plurality of separable sections, a" cam operated lever'having piv- 'otalconnection with one of the sections of said slide, and means operating through the-center of oscillation of said first mentioned lever upon another section of said slide for'varying the effective throw of said awl operating mechanism in accordance with the thickness of the work.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

FRED L. MAGKENZIE. Witnesses:

H. DORSEY SPENCER,

FREDERICK L. EDMANDS.

copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. (3.

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