US 1244912 A
Description (OCR text may contain errors)
H. L. SMITH.
APPLICATION FILED SEPT. 14. l9l6.
Patented Oct. 30,1917.
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I r1 vsrrfar H. L. SMITH.
APFLiCATIQN FILED SEPT. :4. 1916.
Patented Oct. 30, 1917.
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APPLICATION FILED SEPT. 14. 1916.
Patentie 901 a 30, 191?.
3 SHEETSSHEET 3- HENRY L. SMITH, on WATERBURY, coN n'cTicUT,,. issIeNoR TO THE E. J. MA VILLE MACHINE COMPANY, or WATERBURY, coNNEo'TIcUT, n CORPORATION OF ooN- NECTIGUT.
Specification of Letters Patent.
Patented et. so, 1917;
Applicatien fi led sp'teixibr 14, 1916. seine No. 126,028.
To all mam izimay 00mm: v y I Be it known that I, HENRY L. SMITH, a
citizen of the United States, residing at chine's; of which the following is a specification.
Th n ent o' iire a t jto h typ (i chine for swinging the ends of wire rod into whi ii efi im pi ce it s ei k is fed and the exact length cut; on and Calf: ried over into line with the heading punch and die. v V p The obj fltof this invention is'to pro yide for a machine bf this character afstock cut off mechanism which is very powerful, du fable and quick in action soth'a't heavy stock will becut'cleanly andsquarely. V v attaining this" end a barrel cam, con nected with a gear that is driven by a' pinionon the cranksliaft, isarranged' to oscil late a rocker arm on a shaft which a rocker leyer, one end of which engage'se li c rri by th p oeat 'ry h d r, an the'b i? end, f, which' if enaged; y wri g ph se he st being cut in such manner that it ausesthe knife to act on the stock with a q ii'ck' and powerful blow until the piece is sheared Off and then allows the spring to continuelthe movement of the knife and carry mesa off piece over into linewith th'e punch and d'ie. The invention is particularly applicable to what is knowniassingle or multiple stroke soliddie headers, that is, those heafders which have a solid die and a punchipr punches which act either once or more than once on each piece of stock that is cutoff and presented to, the die. p p 7,
Fis'u .of the c mp nyi ,,l it 1es shows a. plan view of a well known double stroke soliddief heading machine; proy'ided with a quick cut-off which is constructed ac} cording to thi'sinyention. Fig. 2 shows on a larger scale a plan of the cut-off mechanism. Fig. 3 shows a sidelelevationofthe cut-ofi' mechanism, Fig. gt is a vi'ew looking from the .rdrtward the cut-off mechamsm. Fig-,5 is a" side View of the" cut-ofi" rocker shaft and its cam am; and knife slide 0peratingleyer.' Fig. sis View of the cutoh disassociate'd from" thei rest' of themaehine; Fig'fi'i" is'zi View skewing the relative positions of the feed quill, stock, knife, die and punch at the time the cutter is shearing o'ff a piece of stock.
The machine illustrated has a reciprocato'ry gate 1 that is connected by a crank rod 2 with a. crank 3 0n the shaft i which is provided With the fly wheel 5. In the front end o'f the l' orizontally movable gate is the vertically movable slide 6 which carries the punch holder 7 with the punch 8. The die 9 is secured in the die block 10 mounted in the end of the framell in line with the punch. The stock is fed at the proper time through the qu'ill 12 by the feed mechanism 13. As these features of the machine are old and well known they are not further described in detail. I
In these machines after thes'tock has been fed' an'd while the punch is returning from its stroke, the knife is advanced for cutting off the properlength of stock and carrying it into line with the punch and die. As the stockisiquite heavy, for instance, it may be ro d a half I inch in diameter, considerable force is required to shear it; In the prior machines that are powerful enough to seyer such stoclgtheiknife moves with a relatively slow motion and this tends to bend the stock and stretch the metal; leaving uneven and untrue orangular ends. Vfith the improved cutting mechanism, which forms the subject of this invention. the knife is moved not only very powerfully, but very quickly so that it strikes the stock with a heavy blow and severe it without bending it, making a clean sheer and leaving square ends.
This is accomplished by connecting a barrel cam 14 with a heavy gear 15 that is mounted on the frame so as to be engaged with and driven by a pinion 16 on the crankshaft. Running in the cam groove 17 0f the barrel cam is a roller 18 on the end of a rocker arm 19 formed atone end of a shaft 2'Othalt is mountcd-inbearings 21 which are secured to the side of th e frame. Formed at the other end of this rocker shaftvis a lever 22'. In practice the rocker shaft, rocker arm and rocker lever have been made of a single heavy steel casting.
The upper end of the rocker lever is rounded and'en'gages a shoe 23 located in amortise in the end of a slide 24 which is moyable horizontally back and forth through'the side of the machine frame on the inner end of this slide is theknife 25, and carried by the slide and projecting over the cutting edge of the knife are spring fingers '26 which are designed to grasp the stock as it is being cut and hold the cut oil piece while it is being carried from cu 1g position into line with the punch and cam groove in the b rrel cam which oscillates the rocker arm is so cut that as the section 27 engages the roll on the rocker arm the parts are operated to drive the mife inward very quickly and powerfully with a positive movement, and following this the wall of the cam groove on one side is cutaway so that after the stock is severed the roll for a time is free from the control of the cam. Engaging with the lower end of the lever on the rocker shaft is a plunger 28 which is thrust outwardly by a heavy spring 29, these parts being arranged in a socket in the frame which supports the cutting mechanism. After the cam has moved the parts so as to sever the stock and the roll reaches the cut away portion of the cam groove, the spring plunger thrusting against the lower end of the lever swings the lever and causes it to push the knife and stock holding fingers farther inward and carrythe stock which has been severel from cutting position into line with the punch and die. The knife is preferably started a little away from'the stock so that it has the momentum of full speed when it strikes the stock for cutting it o f, and thus it gives a quick, powerful, positive blow and not a bending or crushing push, and cuts the stock oft squarely.
In some machines it has been found advisable to attach a supporting plate 30 to the punch holder for backing up the inner end of the stock as it is being cut. The end of this supporting plate is beveled (as shown in Fig. 7 so that as the knife moves in and carries the stock over and the punch and punch holder recede, the end of the piece of stock which isbeing cut v ill slide down the beveled end of the supporting plate, and the axis of the cut piece will keep parallel with the axis of the punch and die, that is, the angle on the end of the supporting plate is made proportionately to the inward movement of the knife and the backward movement of the punch.
lVith this mechanism the barrel cam is driven very powerfullyand its cam groove is so cut that it gives a quick, powerful, posi tive stroke of the knife for severing the stock. The rocker shaft with its arm and lever are strong and durable and they operate quickly and powerfully with a minimum amount of friction and wear. The knife acts in a. straight line, and as stated with a powerful blow so that it will sever heavy stock squarely and truly without bend. The sprin plunger then causes the knife to carry the severed piece of stock into'line with the punch and die, and should any part be come mistimed or displaced, for instance, if a die should pull out so as to obstruct the stock, the spring yields andno damage will i be done.
The invention claimed is:
l. A cut off for heading machine comprising a pinion on the crank-shaft, a gear engaged and driven by said pinion, a barrel cam connected with the gear, a rocker arm adapted to be oscillated by said cam in a plane longitudinal with relation to the aXis of th cam, a shaft extending atright angles to the crank-shaft and adapted to be rotarily oscillated by said rocker arm, alever on said rocker shaft, a slide adapted to be reciprocated parallel with the crank-shaft by the lever, and a knife mounted on said slide.
2. A cut-off for a heading machine comprising a pinion on the crank-shaft, a gear engaged and driven by said pinion, a barrel cam connected with said geana rocker. arm adapted to be oscillated by the cam, a shaft adapted to lever on said shaft, a, slide adapted to be reciprocated by the upper end of the lever, a knife mounted on said slide, and a spring plunger thrusting against the lower end of the lever, the cam groove being cut so that the knife slide is first pushed in positively by the cam and then its movement is 001m pleted by the thrust of the spring plunger.
3. A cut off for aheading machine comprising a pinion on thecrank-shaft, a gear engaged and driven by said pinion, a barrel cam connected with the gear, a rocker arm adapted to be oscillated by'said cam in a plane longitudinal with relation to the axis of the cam, a shaft extending at right angles to the crank-shaft and adapted to be r0- tarily oscillated by saidrocker arm, alever on said rocker shaft, a slide adapted to be reciprocated parallel with the crank-shaft by the lever, a knife mounted on said slide, and spring holding fingers attached to the slide and having bent ends that project .toward each other over the front edge of the knife. e
a. A cut-0d for a heading machine having a gear driven barrel cam, a rocker arm oscillated by said cam, a shaft turned by; the rocker arm, a lever on the rocker shaft, a spring plunger thrusting against the lower end of the lever, a shoe carried by the upper end of the lever, a slide engaged by said shoe, and a knife mounted on the slide.
5. A cut off for a heading machine com: prising a gear driven barrel cam, a shaft at right angles to the axis of said cam, a rocker arm attached to one end of said shaft and engaging said cam, a lever attached to the other end of said shaft, a shoe fitting the upper end of the lever, a slide with a recess containing the shoe, a knife attached be turned by said rocker arm, a
to the slide, and spring fingers attached to the slide and projecting over the cutting edge of the knife.
6. A cut-ofi for a heading machine having a gear driven barrel earn, a rocker arm oscillated by said cam, a shaft turned by said arm, a lever on said rocker shaft, a spring plunger thrusting against one end of said lever, a slide engaged by the other eild of the lever, and a knife carried by the s ide.
7. In combination With the crank-shaft and reciprocating punch holder of a heading machine, of a barrel earn driven from the crank-shaft, a rocker arm oscillated by the cam, ashaft turned by the rocker arm, a lever on the rocker shaft, a slide reciprocated by the lever, a knife carried by the slide, stock holding fingers carried by the slide, and a backing plate mounted on the punch holder for supporting the end of the stock while being cut by said knife and held by said fingers.
HENRY L. SMITH.
Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G.