US2228747A - Die assembly for combined feeding and cold drawing mechanism - Google Patents

Description

Jan. 14, 1941. L. BERKEBIL DIE ASSEMBLY-FOR COMBINED'EEEDING AND COLD DRAWING MECHANISM Original Filed June 27, 1958 3 Sheets-Sheet l INVENTOR. Lee fienfebz'i I AIIORNEYS Jan. 14, 1941. L. BERKEBIL DIE ASSEMBLY FOR COMBINED FEEDING AND COLD DRAWING MECHANISM 3 Sheets-Sheet I5 Original Filed June 2'7, 1938 r, 5 .v m w m an 11 k E w ww M m a a a 2 a L B m Patented Jan. 14, 1941 UNlTED -ftST-ATES on: Ass EMBtY roa coMnfNnoZ FEEDING AND com DRAWING MECHANISM Lee Berkebil, Detroit, Mich., minor to B. W. Manufacturing Company, Detroit, Mich., a corporation of Michigan Original application June 27, 1938, Serial No.

216,134. Divided and this application March 25, 1939 Serial N0. 264,250 y 1 -34 Claims. 7 (01.205-3) This invention relates generally to combined feeding and cold drawing mechanism for headingmachines and constitutes a division of my application filed June 27, 1938, bearing Serial No. 216,134. l

One of the essential objects. of theinvention is to provide a machine of this type with animproved die assembly wherein .the die proper is mounted to permit longitudinal movement thereof against frictional resistance to compensate for any. backward movement of the stock camsed by the action of a gaugev stop to obtain an exactly measured length to be sheared. Another object is to provide a .die assembly wherein the movable die is provided with a yieldable shoe .to obtain the frictional resistance desired.

Another object is to provide a die assembly wherein provision is made for varying the tension on the frictional shoe.

Another object is to provide adie assembly wherein provision is madeforlimiting the longitudinal movement of thedie as required.

Other objects, advantages andnovel details of construction of this invention will be made more apparent as this description proceeds, especially when considered in connection with the accon'rpanying drawings, wherein:

Figure 1 is a sectionalplan viewof a heading machine to which my improvements are applied;

Figure 2 is a side elevation of the feeding mechanism; I I Figure 3 is a vertical centrallongitudinal,section th-erethrough; f V

Figure 4 is an enlarged verticallongitudinal section on line 4 '4 of Figure 1;

Figure 5 isa similar view showing the parts in a difl'erent position of adjustment;

Figure 6 is an enlarged horizontal section through the sizing die-on line ,6 6 of Figure 2;

Figures 7 and 8 are endelevations of the cutoff and transfer means for the blank; s

"Figure 9 is a section on line 9 8 ofoFigure 8 showing the heading mechanism; Figures 10,11 and 12 are similar-views illustrating successive steps inthe 'headingoperation; g

Figures 13 and 14 arediagrams illustrating the operating and timing-mechanism: Referring now to'the drawings, A is the bed or frame and B a reciprocating head slidably engaging'ways C and actuated by a crank or'eccentric Don the main driving shaft E; through the medium of a connecting rod F. On the'head B is mounted a vertically reciprocating slide B which carries a plurality Ofheading dies B B The stock for forming the blanks is advanced in a plane laterallyofi'set from the plane of the dies 13*, B It is then cut 011 in predetermined lengths and the blanksflthus formed are tran's- 5 ferred into the plane ofthe dies to be successively operated upon thereby. Themechanism for accomplishing these functions includes a gear I Y wheel G on the shaft E'which drives an intermeshing gearwheel G inc. 1 to .2 ratio. The 10 gear wheel G is upon a shaft G whichextends transversely of the bed parallel to the shaft E. At opposite ends of the. shaft G are variable throw cranks G and G the one for operating the stock feeding mechanism, and'the other for 15 operating the blank shearing and transfer mechanisms There is also a cam G on the. shaft G which operates a; mechanism for actuating the slide B'so as to alternately place the dies 3 and BF in registrationwith a cut-off blank in its 20 transferred position. More in detail and as shown in Figure 13, the crank. G is provided with a crank pin H, which isadjustable radially in a V slot-H toincrease or diminish thethrow thereof. 'A rod IF connects this crank'pin with an 25 adjustable pinH on the lever H4 for oscillating a gear wheel I, the arrangement being such that for two revolutions of. the crankshaft E one revolution is imparted. to" the crank G Also, the length of the arcthrough' which the gear wheel I is oscillated maybe varied byv adjustment of the .crank pins H and H This gear wheel forms a part of my improved stock feeding and drawing mechanism which will be hereinafter described.

The crank G is connected by a rod J. with a' slide 'J' which has a cam'slot J engaging a pin J on a transversely movable slide J. The slide J actuates the 'shearingand transfer member J as will be'lat'er'described. V The mechanism for operating the slide B',' is

shown in Figure 14 and comprises a slotted member K s'lida-bly mounted on abearing K on the shaft G and reciprocated by the cam G which engages rollers K on'the' member K. Preferably, this member K is connectedto a rock arm K 45 on arockshaft K which extends transversely of the'bed and base. rockarmK connecting the same with slide BC! The cam G? is, so fashioned as to intermittently actuate this mechanism to ra/ise'and lower the slide B with adwell at each 50 end of the movement thereof. 1 3 Connected to the bed'A and arranged in a vertical plane which is radially offset from; the plane of the diesB B is a frame L. 'I'hi's frame is formed in severalfsections including a central 5s die-holding section L and sections L and L on opposite sides thereof which constitute slideways for stock feeders. The outer end of the frame is also fioatingly supported by a pivotal link member L which rises from a supporting base L The stock is advanced through the frame L in a direction from left to right, Figures 1 to 3, and for convenience in description Iwill designate the portion to the right as forward. and that to the left as rear.

Extending across the bed A and the forward end of the frame L are a pair of shafts M and M which are in the same vertical plane and areconnected to each other at one end by the intermeshing gear wheels I and I fixed. to the respective shafts. In central alignment with the frame L are rock arms W which are connected by links M with a slidng head N forming the forward feeder.

The slide head N of the forward feeder has spaced upper and lower portions forming wedge surfaces N' which taper from forward to rear. These portions are held in rigidQrelation to each other by side plates N and suitable splines (not shown). Clamping jaws N are within the recess and have their outer surfaces parallel to the surfaces N with rollers N arranged therebetween. The jaws N embrace the stock which is to be fed and during the forward movement of the head N the resistance or load will tend to draw the jaws rearward, thereby wedging the same to tightly grip the stock. 0n the other hand, when the member N is moved rearward, this will instantaneously release pressure on the jaws so as to permit the same to slide rearward over the stock. Springs N within the recess and bearing against the forward. ends of the laws will hold the same in frictional engagement with the stock. There are alsobushings N and N in the sliding head N for guiding the stock passin therethrough. I

The intermediate section L holds the die member 0 through which the stock is passed to slightly reduce the diameter and finish the surface thereof. This die member,a's shown in Figure 6, is mounted to permit a slight longitudinal movement thereof againstfrictional resistance. For this purpose the die is'isurrounded by an annular member 0 which is fixed in the forward wall 0 of the section L. A friction shoe 0 extending through a recess, in the annuIar member I bears against the'die O, and a spring 0 places a tension on the shoe. This tension may be varied by an adjusting screw 0? which bears against the" follower ,Qf forming an abutment for the spring. To limit the sliding movement of the die within'the annular member 0 screws 0" extend through" threaded apertures in the rear wall 0 of the section L into proximity to the die, and these screws may be ad- .justed to obtain the desired amount of movement. Inasmuch as thefe'eder N is forward of the die 0 itis obvious that someadditionai means must be provided toadvance the forward end of the stock through the die before it can be engaged by said feeder. For; this purpose'I have provided a second feeder P which is substantially the same in construction as the feeder N and, therefore, will not be described in detail. This second feeder is actuated: by the feeder N through the medium of rods P. When thrown I into operation the feeder P may be used for advanclngthe stock through the die'O and into engagement with the'forward feeder N.

The bushings N and .N for the feeder may be selected with respect to the diameter of stock to be passed therethrough and similar bushings are provided for the feeder P which are of a diameter corresponding to that of the stock before'it .passes through the sizing die 0. Still anotherv bushing S is v mounted at the rear end of the frame L and the stock is first fed through this bushing and 'into operative relation to the jaws. of the rear feeder P.

In the operation of the machine the feeding mechanism. may be adjusted to advance the stock bar during each forward movement an amount slightly greater than the length of blank which is desired. The stock bar is then moved slightly rearward so that the length actually sheared therefrom is exactly as predetermined. However, during the shearing operation the shear blade must be inserted between the severed blank and the remaider of the stock and as the shearing member cannot itself move rearward, it necessarily forces the severed blank slightly forward. y Y

Heretofore, machines ofthis kind have been provided with stops which,-during the shearing movement, are rigid and hold the forward end of the sheared blank from any displacement.

Such construction:isobjectionable in not providing for the displacement of the blank during shearing and I havetherefore designed an improved COIIStIlIOtlOIL' This, as shown in Figure 1, comprises a resilient member U secured to an adjustable screw U' and projecting laterally therefrom into the path of the stock bar. The screw U may be adjusted so that the stop is in advance of the shearing plane a distance cor responding to the required length of blank. 5

Consequently, as the stock bar is overfed a certain amount, it will impinge against this resilient stop and slightly displace it in a forward direction. However, upon the rearward movement of the feeder N the resiliency of the member U will force the stock bar rearward which is permitted by the freedom of the die 0 to slide rearward in the annular member 0. To in sure a positive action independent of the resiliency of the" member U, astock member LP 5 on the slide B is moved against said member U during alternate rearward movements of the head B. However, before the shearingof the blank takes places, the positivestop is withdrawn which permits the flexible stop member U to be defiectedforward the required amount. ,1

In operation, the stock which is preferably hot-rolled and coiled is placed ina suitable holder, not shown, and its forward end is passed through thebushing'Sinto engagement with the rear feeder P. After the required number of reclprocations of the feeder P, the stock bar will be advanced into engagement with thedle 0 and then forced through the latter. The forward advancementby the'rear feeder is continued until theforward end of the stock'bar which has been sized by the die 0 comes into operative engagement with forward feeder N.

When the forward end of the stock passes beyond the shearing plane the projecting portion will be cut off and in succeeding operations predetermined lengths will be advanced in each operation. The lengthcf advancement is determined'by' the adjustment of one or the other of the crank pins H and H to increase or diminish 'the amplitude of oscillation of the shafts Mand the forward end will impinge against the resilient stop U and slightly displace the same. As soon as the feeder N begins its return movement the resiliency of the stop will push the stock rearward carrying with it the v die O which slides in the annular member 0'. When the construction shown in Figure 1 is used the stop I) on the slide B will be brought' in contact with the resilient stop U to insure a full return movement of the latter to its normal position. Thus, the length of blank projecting beyond the shearing plane is predetermined.

The operations of shearing the blank; transferring it into the plane of the heading dies and alternate shifting of these dies into alignment with the blank, are accomplished by the mechanism described. In brief, themovementofthe slide J by the crank Gtwill through its cam slot J move the transverse slide J and shear member J This shear member has mounted thereon a resilient clip V which holds the sheared blank to the shear member and carries with it into the plane of the dies B and B as shown in Figures 7 and 8. The shapeof the cam slot J is such as to produce a dwellof the shear member when the blankis in the plane of the dies, and by reasonof the 1 to 2 ratio of the gears G and G, there will be two reciprocations of the head B to one reciprocation of the transfer member J Also, between reciprocations of the head B the mechanism shown in Figure 14 will operate to move theslide B ,sothat' during one reciprocation the die B is registered with the blank and during the other, the die B A cooperating stationary die B is'in registration with the blank in its transferred position. After the initial movement of the die B sufilcient to engage the same with the blank the transfer member'J is withdrawn, the resilient clip V yielding to disengage from the blank. These operations are illustrated in Figures 9 to 12, inclusive. During the, shearing operation'the thickness of the shear member will displace the blank in a forward direction and such movement is permitted by reason of the resiliency of the stop U. This is av desirable feature as otherwise the pressure of the .blank against a rigid stopmightftend to dislodge the same. I v

- What I claim as my invention is: V

1. In a machine of. the character described, the combination with a frame, of reciprocatory means mounted on said framefor periodically advancing the stock, means for reversely feeding the stock a slight amount, and a sizing die through which the stock is advanced during the forward movement of said reciprocatory means, said die having a floating engagement withsaid frame permitting movement thereof with said stock during the reverse feeding. 2. In a machine of the character described, stock advancing means, a stop gauge adapted to move the stock rearward to obtain an exactly measured length to be sheared, a die for sizing the stock advanced and movable with the stock during rearward movement thereof,'and means providing frictional resistance to such rearward movement of the die.

3. In a machineof the character described, stock advancing means, a stop gauge adaptedto ,move the stock rearward to obtain an exactly measured length to be sheared, a die for sizing' the stock advanced and movable with the stock during rearward movement thereof, and-a tensioned shoe providing frictional resistance to such rearward movement of thedie. .l

4. In a machine of the character described, stock'advancing means, a stop gauge adapted to move, the stock rearward to obtain. an exactly measured length to be sheared; a die for sizing the stock advanced and movable with the stock during rearward movementgthereof, and means for limiting such 'rearward movement of the .die.

v5. mamaenme of the character described,

stock advancing means, a stop gauge adapted to move the,stockrearward' to obtain ane'xactly measured length to be shear d,- adie for sizing the stock advanced and movable with the stock during rearward. movement thereof, and an adjustable stop .for limiting such' rearward movementofthe die;

6. In a machine of the character described, stock advancing means, a stopgauge adapted to move the stock rearward toobtain an exactly measured length: to be sheared, a diefor sizing the stock advanced and movable with the stock during rearward movement thereof, a tensioned shoe providing frictional resistance to such rearwardmovement, and means forvarying the tension on said shoe to alter the resistance on said die., I

7. In a machine of the character described, a frame through which stock may be advanced, a stopgauge adaptedto move the stock rearward to obtain an exactly measured length to be sheared, a die forjsizing the stock as it is advanced andmovable with the stock during rearward movement thereof, a supporting collar for said die fixed to said frame and permitting the rearward movement of the die, and means extending throughgthe collar providing frictional" resistance to such rearward movement of the die. 8. ma machine. of the character described,

a frame through which stock may be advanced,

astop gaugeadapted to move thestock rearward to obtain an exactlymeasured lengthltobe.

sheared, a die forsizing the stock as'iit jisad vanced and-movable with the stockduring rear-, ward movementthereof, a supporting collar forsaid die carried. bysaid frame and permitting the rearward movement of the die, and an adjustable stop for limitingsuch rearward move: ment of the die.

10. In a machine of. the character described, a; frame'through which'stock maybe advanced, a

stop gaugeadapted to movev the stock rearward to obtain an exactly measured length. to be sheared, a die for sizing the stock as it is ad-ff vanced and movable with the stock durin rear-'- ward movement thereof; a supporting, collar for said die carried by said frame? and permitting the rearward movement of thedie, and a tensioned shoe extending through said collar pro-.

viding frictional resistance 'such rearwardmovement 'ofthe die. i r

11. In a machine of the character described, a

frame through which stock mayv be advanced, a

stop gauge adapted to move the stock rearward to obtain an exactly measured length to be frictional resistance to such rearward movement of the die, and adjustablejmeans carried by the frame for varying the tensionfon said shoe.

r the die.

12.'In a machine of the class fdescribed, the combination with means for shearing stock and means for advancing the stocktowardj' said shearing means of means for moving the stock rearward to obtain an exactly'rneasured length to be sheared, and a die ,for sizing the stock as it is advanced held against movement "during advancement of the stock but movable with the stock during rearward movement thereof.

' 13. In a machine of the class described, the combination with means for shearing stock' and means for advancing the stock toward said shearing mens, of means for moving the stock rearward to obtain an exactly measured length to be sheared, a die for sizing the stock during advancement thereof, and a mounting 'for said die holding the same against movement during advancement of the stock but permitting the die to move with the stock during rearward movement thereof. i 3

14. In a machine of the class described, the combination with means forshearing stock and means for advancing the stock toward said shearing means, of means for moving the stock rearward to obtain an exactly'measured length to besheared, a die for sizing the stock as it is advanced-held against movement during advancement of the stock butl'movable with the stock during rearward movement thereof, and means for limiting the movement of the die with the stock.

15. In a" machine of the class described, the combination with means for shearing stock and means for advancing the stock toward said shearing means," of means'for moving the'stock rearwar t'o'fobtain an exactly measured length to be sheared, a .die for sizing the stock as it is advancedheld. against movement during advancement of the-stockbutimovable with the stock during rearward movement thereof, means providing frictional resistance to movement of the die with the stock, and means for limiting movement of the die with the stock;

16.-In a machine of the class described, a frame through which stockma'y be'jadvanced, means for moving'the stock rearward to obtain an exactlymeasured length to, be'lsheareda die for sizing thefstook as it is advanced and movable with the stock during-rearward movement thereof, and a support for said die carried by said frame and permitting the rearward movement 17. Ina machineofthe 5 class described, a

frame through which stock may be advanced,

means for moving the stock rearward to obtain an exactly measured length to be sheared, a. die for sizing the stock as'it is advanced" and movable with the stock duringrearward movement thereof, a 'support for'said die carried by said frame and permitting the rearward movement of the die, and means carried by the support providing frictional resistance to such rearward movement of the die. t I j n 18. In a machine ofthe class described, a die for sizing stock; said' diefbeing'held against movement while the stock is being sized but mov frame, an annular-member'flxed to said frame, a

sizing die for stock slidable within said annular member, a friction shoe carried by the "frame and engaging said die, and means for limiting sliding movement of the die,'includingan adjustable element carried by the frame in the path of-said die. I

20. In a machine of the class described, a a

frame, shearing means for thestock carried by the frame, means carried by the frame for advancingthe stock toward the shearing means, means for moving the stock rearward to obtain an exactly-measured length to be sheared, a die for sizing the stock as'it'is advanced held by said frame against movement during advancement of the stock but movable relative to theframe during rearward movement of the stock, and means carried by said frame for limiting the movement aforesaid of said die. y

21. In a machine of the class described, a frame through which stock may be advanced, means for moving the stock rearwardly a slight amount relative to the frame, an annular member fixed to=said frame and having a recess in a wall thereof, a sizing die for the'stock having a floating engagement with said recess permitting movement of thedie with the stock during rearward movement thereof, and means for resisting the floating movement of the die including a friction shoe carried by said frame and engaging said die. 7 e i t 22. In a machine 'of the. class described, a die for sizing stock, said (l e being held against move 1 ment while the stool; isbeing sized'but, movable with the stoclrupon movement thereof, in a predetermined direction, and means providing frictional resistance to movement of the diewith the stock. c I r Y,

23. In a machineof the class described, a frame,means mounted'on the frame for advanc ing stock relative to the frame, means for reversely moving the stock a slight amount relative to the frame, and a sizing die for the'stock' held by-the frame against movement with the stock while it'is being advancedand having arfloating engagement with said frame permitting movement'of the diewith the stock during reverse movement thereof. v

24. In a machine of the class described, a frame-means mounted on the frame for advancing'stock relative'to the frame, means for reversely movingthe stock' aslight amount relative to the frame; a sizing die for the stock, and a mounting for the die holding it-against movement while the" stock is advanced but permitting the die to move' with the stock-relative to the frame when the stock is reversely moved.

25.,In a .machine'of the class -1described, a,

frame, shearing means forthe stock carried by the frame, means carried by the frame for advancing the stock toward the shearing means, means for moving the stock rearward to obtain an exactly measured length to be sheared, a die for sizing the stock, a mounting for said die holding it against movement while the stock is advanced but permitting the die to move with the stock during rearward movement of the stock, and means carried by said frame for limiting the movement aforesaid of said die.

27. In a machine of the class described, a sizing die for stock, means 'for advancing stock through the die, means for shearing the sized stock, means for reversely moving the stock a slight amount to obtain the desired length to be sheared, and a mounting for the dieholding it against movement while the stock is advanced.

but permitting the die to move with the stock when it is reversely moved.

28. In. a machine of the class described, a sizing die for stock, means for advancing stock through the die, means for. shearingthesized stock, means for reversely moving the stock a slight amount to obtain the desired length to be.

sheared, a mounting for the die holding it against movement while the stock is advanced but permitting the die to move with the stock when it is reversely moved, and means for limiting said movement of the die.

29. In a machine of the class described, a sizing die for stock, means for advancing stock through the die, means for shearing the sized stock, means for reversely moving the stock a ing die for stock, means for advancing stock I through the die, means for reversely moving the stock a slight amount, and a mounting for the die holding it against movement while the stock is advanced but permitting the die to move with the stock when it is reversely moved.

31. In a machine of the class described, a frame, a mounting for a sizing die carried by said frame, a sizing die for stock carried by said mounting, means for advancing stock through the die, and means for reversely moving the stock a slight amount, the die being held by'the mounting against movement during advancement of the stock and movable relative to the mounting with the stock when it is reversely moved.

32. In a machine of the class described, a sizing die for stock, means for advancing stock through the die, means for reversely moving the stock a slight amount, a mountingjfor the die holding it against movement while the stock is advanced but permitting thedie to move with the stock when it is reversely moved, and means resisting said movement of the die.

.33. In a machine of the class described, a sizing die for stock, means for advancing stock through the die, means for reversely moving the stock a slight amount, a mounting for the die holding it against movement while thestock is advanced but permitting the die to move with the stock when it is reversely moved, means resisting said movement of the die, and means for limiting .the resisted movement of the die.

" 34. In a machine of the class described, a sizing die for stock, means foradvancing stock LEE BERKEBIL.

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