US2819464A

US2819464A - Shoe lasting machine

Info

Publication number: US2819464A
Application number: US429158A
Authority: US
Inventors: Jacob S Kamborian
Original assignee: Individual
Current assignee: Individual
Priority date: 1954-05-12
Filing date: 1954-05-12
Publication date: 1958-01-14
Anticipated expiration: 1975-01-14

Description

J. S. KAMBORIAN SHOE LASTING MACHINE Jan. 14,1958

4 Sheets-Sheet 1 Filed May 12, 1954 //VVENT0R .J4c05 5. MMBO/P/A ATTORNEYS Jan. 14, 1958 J. s. KAMB'ORIAN SHOE LASTING- MACHINE 4 Sheets-Sheet 2 Filed May 12, 1954 //v|//,v TOR JAcoB 3. KAMBwmN BY 733M, 3M

ATTORNEYS ,1. s. KAMBORIAN Jan. 14,1958

SHOE LASTYING MACHiNE' 4 Sheets-Sheet 3 Filed May '12, 1954 //Vl/N TOR (Z2005 8. KAMBOR/AM BY W, 55

ATTORNEYS Jan. 14, 1958 J. s. KAMBORIAN SHOE LASTING MACHINE Filed May 12, i954 4 Sheets-Sheet 4 I/VVE/V 70R c/hcoB 8. KAMBORMN ATTORNEYS Unite atent SHOE LASTINQ MACHINE Jacob S. lKamborian, West NeWtomf-Mass. ApplicationrMay 12, 1954, Serial N0. 429,158 3 Claims. ..(C]. 1-2) lThis invention relates to shoe=machinery-and more especially: to staple lasting machines with improved 1 mechanism foriforming the staples from wire stock.

While themachine is designedespecially for staple lasting=ofvshoes and like articles of footwear;hereinafterreferred tofor the sake of convenienceas shoes, that is to a machine in which=amarginalpart of the upper is affixed temporarily'or permanently to'aninsole or the like by staples, the mechanism provided for by'this invention is' not restricted in itsutilityto staple lastingmachines for footwear but is.also'applicable to machines for' performing an analogous operation in the covering of apanel or a' like; substantially rigid and flat or sheet-like base member (capable of-having staples driven into it) with a covering of flexible sheet material with orwithout interpositioniof aipaoking or 'upholstery padding or filling betweeniai face of the base-member and the covering.

lTherinvention is illustrated herein with respectto a lasting machine ef the 'kindin which there are lasting instrumentalities comprising apair of drafting rolls arranged uprogressively to grip successive small areas of the lasting margin, stress them and then release them'to wiperameans operable in continuous or intermittent fashion: to fold the stressedareas of "the margin into contact with the bot-tOm. Tosecurethelasting margin after'it is folded, stapling means islocated close to the wiper means:at thesidefrom-which the work ismoving to drive staples- -through it into thebottom ofthe shoe. If desirable, there maybe an applicatorlocated between the stressing means and thewiping means operable to apply adhesive to one or both of the surfaces ofthe shoe bottomtand the underside of the lasting margin to supplement the stapling or if the stapling is to be only ofa temporary kind, to afford theultimate attaching. means.

The principal objects of this invention are.toprovide stapling mechanism for a machine ofthe foregoing kind, in w-hichthe lengths of the legs of the staples to be driven may be varied at will in accordance with the thickness of the w'ork into' which they are to be driven for attaching the parts. Another object is to provide staple mechanism for:cut'ting and forming staples of varying lengths of leg in which the respective legs may be made of equal or unequallengths in any given staple. Another object of the invention is to provide staple cutting and forming means which is operable to cut and form staples of the desired size continuously and in timed relation with the stapledriving means so that staples may be driven successivelyand at regularly recurrent intervals into the marginoftheupper as it is released from the Wiper means but which may optionally be interrupted so asto omit staples :from certain parts of the work or to omit the staples .entirely so that the machine may be used for cementllastingwithout staples. Other objects are toprovide awstaple mechanism which is dependablegefhcient and durable in operation.

:Astherein illustrated, the lasting machine "has staple forming means located :close to the drafting rolls atid at the forward side thereof, for operating upon the stressed Patented Jan. 1 4, 1958 areas of the upper material as it emerges from the wiper, means operable intermittently and in timed relation with the staple forming means to deliver predetermined lengths of staple forming wire to the stapleforming means and means operable without interrupting the'stapling operation to alter the length of the wire delivered to the staple forming means at any given timeso as to varyithe lengths of'the staple legs. The means for'effecting delivery :of the'staple wire isinthe form 'of a pair of feed rolls co-, operableto advance the wire andthe means'for ehanging the length of wire delivered bytherollsis controlledby ratchetand pawl means including an oscillatable carrier for thepawls whichsupports the'pawls at diiferent (lista'ncesfromthe roots of the teeth ofthe ratchet so that variationsin thearnplitude of oscillation of the carrier brings diflferentones ofthe pawls into operative position forefiecting rotation ofthe rolls. A connecting rod having a" variable stroke is provided for controlling the angular position .of the pawl. carrier and hence the amplitude of its oscillation. The staple forming means includes an anvil and shearing meansfor cutting the wire'as it is delivered across the anvil. in accordance with the invention, the shearing means is movable relative to. the anvil tornake it' possible to cut the Wire With'equal or unequal lengthsprojecting from opposite sides thereof so thatwhen formed the staple may have legs of equal or unequal lengths. The shearing means is shifted relative to the anvil in proportion tothe change in the angular rotation of thefeedrollgby means associated with. the feed. rolls. There is alsomeans associated with the'feed rolls for discontinuing delivery "of the staple wire eintirelyin the eventythat it is desirable toJeltect lasting withoutzstapling, whichmeans operates to disengage the feed. rolls. Thus, one of the feed rolls is mounted forfmovementf relative to the other, thereisrneans normally holding the rolls in cooperative-relation .and'means for moving the movable roll away from the other roll.

The means for altering .thelength ofwire 'deliveredby the -wirefeeding means and the meansfor discontinuing the feedingo'f the' wire altogether are interconnected so as to be operable by a common operative displaceable by the operator in onedirection to change the stroke of the. connectingrod and in the other direction towseparate-the'feed rolls. The invention will now be described in greaterfdeta'il withreference totheaccompanying drawings wherein:

Fig. 1 'is afront view of aprogressive lasting machine provided with staple forming mechanism according .to the present invention;

Fig. 2 isa side view of the machine;

Fig. 3"is a detail of trigger mechanismIIfor cocking and releasing the. staple driving means;

Fig. 4 is a further detailof the trigger mechanism;

Fig.5 is a side view as seen from theleft hand side ofFigQl;

Fig. 6, is a detail of theamechanism for .a'lteringnthe amplitude of rotation of the staple wire feeding means;

Fig. 7is.anenlarged view of the staple wirefeeding means "and forming means as shown in'Fig. 1, with the lasting rollsomitte'd; and

"Figs.8,"9"and 10 are details of means for varyingl'the efiective stroke of the connecting rod showninFign 6.

Referring to the "drawings, the slastingmachine ;is.of the typedisclosed-and"described inPatent Nos. 2,251,285 and 2;57l14 ).andthe various modifications and improvements-basedlhereon, wherein a pair of opp0sitcly..rotating feed'rolls areemployed. for progressively applying a stressto the margin of upper material, to tensionpit with reference to thelast and in conjunction therewith a wiper of continuous or reciprocating type isemployed for 'operating upon thestressed margin immediately as it is delivered from the feed rolls in such fashion as to force it inwardly parallel to the bottom of the shoe with or without application of adhesive to the surfaces of the sole and inner margin. As herein illustrated, Figs. 1 and 2, the machine comprises a base 100, preferably a hollow column having a motor (not shown) and supports an inclined head or frame 102 in which are rotatably mounted a pair of shafts, one of which is shown at 106 (Fig. 1), to the lower ends of which are fixed coneshaped

work feed rolls

108 and 110 which constitute the stress applying rolls of the aforesaid lasting instrumentalities. A belt 112 entrained about spaced pulleys, one of which is carried by the motor shaft and the other of which is shown at 113, effects rotation of the shaft 114 carried by the frame 102 and is operably connected through appropriate gearing to the pair of shafts, in such manner as to effect rotation thereof in opposite directions. A rotary wiper such as shown in Patent No. 2,571,140 may be employed or a reciprocable wiper such as shown in Patent No. 2,467,385. An applicator in the form of a nozzle for applying adhesive is also shown in this latter patent and may be used herein to supplement in whole or in part the staple lasting if desired.

The present invention contemplates the use of staple forming and driving mechanism with the aforesaid progressive lasting instrumentalities. This is supported on the column 100 by a perpendicular head or frame 116 (Figs. 2 and The staple forming means includes an anvil 1 (Figs. 1, 2 and 7) supported in a horizontal position at the underside of the frame 116 by a block 118 fast thereto and is rearwardly yieldable therein, being normally held in a forward position for the forming operation by a backing spring 13 and being yieldably displaceable therefrom to Withdraw it from the staple to free it for driving. At one side (the left as shown in Fig. 7) of the anvil, there is a cutter block 3 and a reciprocable shear blade 4, between which two parts, the staple wire passes both of which bear a fixed relation to each other but which are carried by a movable slide bracket 120 so that they may be moved relative to the anvil to change the length of wire cut at any given time as will appear hereinafter. The side faces of these two parts are disposed obliquely to the lengths of the staple wire 2, so that when the shear blade 4 is lowered to pass the cutter block 3, the length of wire 2 disposed over the anvil 1 is out 01f obliquely thereby insuring that the legs of the subsequently formed staples have sharp points.

Associated with the anvil 1, and located above it, there is a U-shaped former 5, such as shown in Patent No. 2,424,239, slidable in a guide slot formed in a guide member 122 fast to the frame 116, which is positively reciprocated by a cam mechanism 6 operably associated with a cam shaft 19 journaled in the frame 116 (Fig. 2). The lower end of the former has an inclined surface 7 which cooperates with an inclined face 8 on the anvil 1, in such manner that after the staple has been formed the anvil 1 is moved rearwardly as stated above, against the action of the spring 13, in such direction that it is extracted from the staple. This leaves the staple free to be driven into the work by a reciprocable driver 9 which is carried in a slot in the face of the forming member and is movable independently thereof, which propels the formed staples down a guide groove 10 formed in a jaw 11 which extends for contact with or close to the level of the work as delivered from the lasting instrumentalities.

The cutter is downwardly movable in its bracket 120 and is lowered to cut the wire resting on the anvil by the initial downward movement of the former member 5. The former has on it a shoulder which engages a corresponding shoulder on the cutter, and which, as it descends, carries the shoulder downwardly through cutting position and beyond to the end of the former stroke. Restorative means in the form of another shoulder, a linkage or a spring may be employed to return the cutter on the cam shaft 19 mentioned above.

to its upper position as the former rises for the next forming operation.

The driver acts with a percussive eifect produced by the instantaneous release of a stressed spring. To this end, in the present construction, the upper end of the driver 9 is connected to a rock arm 12 (Fig. 2) biased in the driving direction by a strong coiled spring 14 and having its other end disposed beneath a projection 15 (Figs. 3 and 4) on a reciprocable cocking bar 16 fast to a slide 124 mounted on the rear of the frame 116 for vertical sliding movement in spaced guide tracks 126126 rising from the rear end of the frame 116. This cocking bar 16 is constantly vertically reciprocated by a con necting rod 17 and a crank 18 fast to the cam shaft 19 which also carries the cam 6 for actuating the former and a cam 20 for operating the wire feeding means to be described hereinafter. There is a latch bar 21 pivotally mounted at 127 on a bracket 128 fast to the frame which is yieldably urged in a counterclockwise direction by an appropriate spring 21a. A spindle 130 is fastened to the bar 21 and has on it a roller 23. When the cocking bar 16 has reached the lower end of its stroke, the latch bar 21 temporarily latches the arm 12 against movement by the spring 14 while the cocking bar 16 rises. At an appropriate time this latch 21 is released by a trigger mechanism controlled from the cam shaft and conveniently comprises a cam arm 22 carried by the cocking bar 16, the lower part of which is laterally inclined so as to engage a roller 23 of the latch 21, as the slide 16 nears the upper end of its movement to release the latter from a projection 24 on the arm 12 so that the arm is released and the driver is operated with a percussive effect. Initial movement of the driver when released by the latch is constrained by contact of it with the top of the anvil, that is the driver when released by the latch moves a short distance into contact with the anvil and is constrained thereby from further movement during the staple forming operation. While thus constrained the driver clamps the wire against and across the anvil under the full spring pressure of the spring 14, during the time that the staple legs are being formed. As previously pointed out, when the former reaches the lowermost part of its forming movement it forces the anvil rearwardly from beneath the formed staple and simultaneously releases the driver, which thereby permits the spring to impel the driver downwardly throughout the remainder of its stroke with percussive effect. Thus the anvil acts not only in combination with the former to shape the staple but as a latch for constraining the driver and in combination therewith holds the wire during the leg bending operation so that the top or bight of the staple is prevented from bowing and is maintained straight and flat. Care in forming the staples with straight tops and with the legs bent sharply and substantially at right angles to the tops result in less tendency for crippling during the driving operations.

The staple wire 2 which is drawn from a coil thereof, not shown, is fed by two cooperating wire feed rolls 25 and 26 (Figs. 1 and 7) biased together frictionally to grip the wire 2 between them. The feed roll 25 (Fig. 5) is mounted on and fast to a shaft 56 journaled for rotation in a bearing sleeve 134 carried by a sub-assembly casting 62 movably mounted on the frame as will appear hereinafter. The shaft 56 is racked around step by step to rotate the feed roll by pawl and ratchet or equivalent mechanism 27 (Figs. 5 and 6) driven from the cam 20 The feed roll 26 is mounted for free rotation on a short stub shaft 136 fixed in the lower end of one arm 138 of a bell crank lever 146, the knee of which is pivotally mounted on a pin 142 fastened in a boss 144 carried by the aforesaid sub-assembly casting 62. The rolls are normally held engaged by a spring 31 stretched between an anchoring bolt 146 set into the end of the arm 138 and a bolt 148 set into a part of the frame, however, the roll 26 may be estate;

separated from the roll 25 by rocking the bell crank 140 in a counterclockwise direction, for example by pulling downwardly on the arm 73. From the nip between the two rolls 25 and 26 (which may be geared together if desired by gears 32 and 33 (Fig. 7) and are provided with check pawls or their. equivalent (not shown) to prevent reverse rotation), the wire 2 passes toward the anvil 1 through a curved tube 28 (Figs. 1 and 5) and in order to minimize friction the interior of the tube is lined with a close coiled metal helix or spring 29 (Fig. 7) through which the wire 2 extends.

This tube 23 leads downwards from the wire feed rolls 25 and 26 and then curves round so that its delivery end extends horizontally. In order to eliminate any curvature put into the wire 2 by travel round the bend, the tube 28 is given a reverse bend 129 (Fig 1) just before its delivery end.

In accordance with one aspect of this invention, rotation of the wire feed rolls to advance the staple wire is effected intermittently and by different angular amount selectable by the operator without interrupting operation of the machine during progressive lasting of a shoe to change the lengths of the legs of the staples being driven. This is effected by the aforesaid ratchet and pawl means 27 (Fig. 6) which is mounted on the shaft 56 and which in turn is actuated by a connecting rod 40 of variable stroke, reciprocation of which is controlled by the cam 20. The ratchet wheel 51 is fixed on the shaft 56 which carries the feed roll 25. The pawl means consists of a carrier 38 free to turn on the shaft 56 on which are four

pawls

52, 53, 54 and 55. These pawls are located at different positions with respect to the teeth on the ratchet wheel with which they engage so that when, for example, the pawl 54, as shown in Fig. 6, is engaged with the root of its tooth, the pawl 52 engages a quarter tooth distance from the root of its tooth, the pawl 53 engages half-way along its tooth and the pawl 55 engages three-quarters of a tooth distance from the root of its tooth. The pawl carrier 38 is oscillated as previously pointed out by the connecting rod 40, which is pivotally connected near one end 36 to the carrier by a pin 37 and has at its opposite end 35 a cleft 41, the

jaws

42 and 43 of which are provided with parallel guide surfaces 44 and 45, which slidably engage surfaces 46 and 47 on a guide 48, througr which the cam shaft 19 extends rotatably so that the driving connection between the cam and connecting rod is not interrupted by the bodily adjustment of the subassembly casting 62. The connecting rod has on it a follower 34 which is adapted to engage the edge of the cam 2t), and is held thereagainst by a spring 39. It will thus be appreciated that as the cam shaft rotates the ,of the step by step feed imparted to the wire feed rolls is altered by changing the stroke of the connecting rod 40. For this purpose the connecting rod is provided near its pivoted end 36 with a stop roller 58 fast thereto which cooperates with the edge 59 of a vertically movable stop bar 60 (Figs. 7 to slidable in a vertical groove formed in the sub-assembly casting 62. The edge 59 of the stop bar is inclined or stepped as at 61, so that according to its vertical position the stop roller 58 may be shifted laterally with reference to the cam shaft 19 which in turn shifts the connecting rod, so as to change the spacing between the follower 34 and the axis of rotation of the cam 20. By shifting the follower in a direction away from the cam it may be held off of its periphery at the regions where the radius of the cam is less than that distance so that the stroke of the connecting rod and hence the amplitude of the feeding movement is changed,

d that is the connecting rod will be acted upon only during part of the rotation of the cam.

The wire feed rolls 25 and 26 as pointed out heretofore, advance a predetermined length of staple wire across the anvil 1 and by varying the amplitude of the oscillation of the wire feed rolls the length of wire projected across the anvil may be varied. If the cutting or shearing means for cutting off a length of wire prior to the staple forming operation was fixed, such variation in length would always result in a staple in which one leg was of fixed length and the other of variable length and it would make it impossible to secure, if desired, a staple with legs of equal length, except in one instance and that would be where the feeding movement was such that the end of the wire projected beyond the anvil, did .not exceed the distance between the near side of the anvil and the cutting means. Accordingly, and as another important aspect of the present invention, the cutting means is made shiftable so that the length of the two legs may be made equal irrespective of the lengths of the wire cut off, or of unequal length but with a corresponding increase or decrease in the lengths of both legs. For this purpose, as heretofore pointed out, the two cutter members 3 and 4 (Fig. 7) are fastened to a movable slide bracket so as to be bodily movable toward and away from the anvil 1, as the feed is adjusted. The slide bracket 120 is bolted to a plate which in turn is attached by bolt and slot means 152 and 154 to the sub-assembly casting 62. The casting 62 has an opening 161 in it which provides vertically spaced ways slidably engaged with the edges of a rigid plate and may be moved on the plate in a horizontal position toward and away from the staple forming mechanism. The plate 160 has at one end a flange 162 which is fastened by bolts 163 to the frame 116. The casting 62 which carries the

cutter members

3 and 4, is bodily adjustable by means of the stop bar 60, which as heretofore pointed out was operable to modify the stroke of the connecting rod. For this purpose the stop bar has an inclined slot 63 through it in which there is engaged a roller 64 carried by the fixed plate 160 so that when the stop bar 60 is raised or lowered to alter the stroke of the connecting rod and hence the amplitude of the feed rolls, the casting 62 is shifted and any change in the length of the staple wire is divided equally between the two legs of the staple. Alternatively as shown, the stop bar 60 may carry the roller 64 and the slot 63 may be in the fixed plate 160. If it is desirable to have the legs of unequal length but increased or decreased proportionately, as above, the initial position of the plate 156) may be adjusted on the casting 62 by the adjusting bolt and slot means 152 and 154.

Movement of the stop bar 60 may produce slight movement of the feed rolls 25 and 26, and hence a slight forward feeding movement of the staple wire. The possibility of this occurring at certain phases of the staple forming sequence is undesirable and so a suitable mechanical interlock may be provided if desired between the stop bar 60 and the reciprocating former 5, driver 9 and shear blade 4, so as to prevent movement of the stop bar except when all these three parts are in their retracted position. Such mechanism may comprise an inclined lug 65 (Fig. 7) formed on the face of the stop bar 60 (Fig. 5) for releasable engagement, a latch bar 66 pivotally connected at one end to a slide 67 (Figs. 5 and 7) and at its other end to a lug on an extension of the pin 37 so that reciprocation of the pawl carrier in turn reciprocates the slide 67. Thus the lug on the slide is alternatively moved into and out of locking engagement with the lug on the stop bar.

At times it may be desirable to omit stapling along certain portions of the work or to discontinue it entirely without interrupting operation of the lasting instrumentalities. Accordingly, the feed roll 26 is mounted for movement to and from the feed roll 25, from which it derives its motion by way of the gears 32- and 33. The

gears 32 and 33 arefast to therespective rolls and have teeth long enough so that the rolls can be disarranged withoutrseparation of the gearsso far as completely to disengage the teeth of the gears. Normally the rolls are held in cooperative relation by the spring 31 but are separable by counterclockwise rotation of the bell crank. By rocking the lever 140' just enough to disengage the rotating surfaces of the Wire feed rolls and 26 from the wire, the frictional feed thereof is interrupted and the resistance of the wire to leave its coil will be sufiicient to discontinue feed.

In accordance with another aspect of this invention, operation of both the stop bar 60 which controls the amplitude of the staple wire feeding means and of the bell crank 140, which controls feeding cooperation of the feed rolls is effected by a common operators control 161 (Fig. l) movable in one direction to effect operation of one of the means and in the other direction to effect operation of the other of the means. This operators control consists of a knee pad designed to be moved by the knee of the operator and is connected through a uni versal joint 68 and link to one leg of a T-lever 69, the opposite ends of the head of which are connected by

links

70 and 71 respectively, to the arm 73 of the bell crank 140 and the stop bar 60 through a lever 74. The link 70 is connected by a lost motion slot 72 so that actuating of one means will not interfere with the other.

In operation the work feed rolls and wiper mechanism which constitute the lasting instrumentalities operate continuously as long as the operating treadle is held depressed so that the cam shaft 19 rotates continuously. Accordingly, so long as the knee control 161 is left in a neutral position so that the wire feed rolls 25 and 26 are in cooperative feeding position for advancing staple wire to the staple forming and driving means, the latter will be operated intermittently and at a constant oscillation to deliver predetermined lengths of staple wire to the anvil whereupon these lengths will be cut off and driven into the shoe. If by reason of the increase in the thickness of the upper material at any point along the shoe, it is desirable to increase the lengths of the legs of the staples or by reason of a change from one kind of shoe to another, it is desirable to increase the lengths of the legs of the staple, the knee control may be shifted to the right as shown in Fig; l, which as heretofore described changes the stroke of the connecting rod and brings 'a different one of the pawls into engagement with the ratchet thereby changing the oscillation of the feed rolls and at the same time shifts the cutting means by half the amount of the change in the. staple leg length so as to preserve the proportional lengths of the legs of the staples.

If through some reason it becomes desirable to discontinue the staple driving in a part of the shoe or all together, the knee control 160 may be shifted to the left so as to rotate the bell crank 140 in a counterclockwise direction and separate the feed roll 26 from the feed roll 25, thus disengaging the wire so that the latter is not delivered to the staple forming means and so that while the staple forming means and driving means continues to operate, no staples will be driven into the work.

While the aforesaid machine has been described with special reference "to stapling shoes, it is, of course, to be understood that stapling mechanism of this kind is equally useful for making panels in'which flexible sheetcoveringmaterial is applied to 'a stiff backing member with or without an upholstery pad or filling between them, and it is within the contemplation of this invention to apply the aforesaid stapling mechanism to an upholstery machine of the kind wherein progressive stressing of the margin ofthe flexible material over an edge of a stitf backing panel is effected by cooperating feed rolls and wiper mechanism of the foregoing kind.

It should be understood that the present disclosure is for the purpose of illustration only and that this invention. includes. all modifications and equivalents which fall within the scope of the appended claims.

I claim: I

1. In a lasting machine, staple forming means, mean for effecting operation of the staple forming means, a pair of feed rolls for advancing staple wire to the staple forming means, means operable in timed relation to the staple forming means to advance the feed rolls through a predetermined angle of rotation, said means including a ratchet wheel, a movable carrier suporting a plurality of pawls in operative relation to the ratchet wheel, with the pawls at different distances from the base of the teeth on the ratchet, said carrier being oscillatable alternatively to advance a pawl carried by it in the direction to rotate the ratchet wheel a given amount and then to retract it, and means for varying the angular oscillation of the carrier so that different ones of the pawls will be moved into operative position depending upon the amplitude of the angular oscillation, including a reciprocal connecting rod, and means operable to change the stroke of the connecting rod.

2. In a lasting machine, staple forming means, a pair of feed. rolls for advancing predetermined lengths of staple wire to the staple forming means in timed relation with the operation of the staple forming means, means supporting said rolls in operative and inoperative positions, means for effecting rotation of the feed rolls different amounts, and means selectively operable by the operator in one direction to change the amount of rotation of the feed rolls when in operative position for any given delivery of wire to the staple forming means and in another direction to move the rolls to inoperative position to discontinue the feed of the staple wire entirely.

3. In a lasting machine, staple forming means and a pair of feed rolls for advancing predetermined lengths of staple forming wire to the staple forming means, one of which is mounted for movement away from the other, means normally holding the feed rolls in cooperating relation, means for effecting rotation of one of the feed rolls intermittently in timed relation with the operation of the staple forming means, means carried by the one feed roll, and common means operable by the operator means for changing the amplitude of rotation of the one feed roll, and common means operable by the operator in one direction to change the amplitude of rotation of the one feed roll and in the other direction to separate the other feed roll from the one feed roll.

References Cited in the file of this patent UNITED STATES PATENTS 571,227 Hamm et a1 Nov. 10, 1896 884,337 Kienast Apr. 7, 1908 1,207,749 Grush Dec. 12, 1916 1,836,229 Duplessis et al. Dec. 15, 1931 2,190,684 Sims Feb. 20, 1940 2,251,285 Kamborian Aug. 5, 1941 2,314,184 Zeruneith Mar. 16, 1943 2,325,100 Blanchard July 27, 1943 2,424,240 Kamborian July 22, 1947 FOREIGN PATENTS 570,614 France Ian. 18, 1924