US1478314A - Trimming mechanism - Google Patents

Description

Dec. 18, B923. 11,4?,314

. R. L. WILCOX TRIMMING MECHANI SM Filed July .1., 1921- 5 Sheets-Sheet 1 Filed Jly 1,

1921 3v Sheets-Sheet 2 /7 Km @ZM Dec. 38 1923. l

R. L. WlLcox TRIMMING MECHANI SM Filed July .1, 1921 3 Sheets-Sheet D Patented Dea:a 1d, 1923.

Enr-i riJ all Application lef .Tuly l,

T @ZZ wiiom t may concern Be it known that l, Riel-nino LnsTni: WiL- cox, a citizen ofthe United States, residing at lliiaterbury. in the county of New Haven and State of Connecticut, have invented certain new and useful improvements in r1`rimming Mechanisms, of which the following is a specification, reference being had therein to the accompanying` drawings.

rihis invention relates to a new and iniproved trimming mechanism and has for its object, among other things, to provide a machine for trimming blanks that will be most efiicient in its operation, and constructed of the fewest possible parts.

rllhe. improvements in the details and arrangement of parts will be apparent yfrom an inspection of the accompanying 'drawings in connection with the description hereinafter containedl and wherein a preferred embodiment of the invention is disclosed for the purpose of imparting an understanding of the same. Y

1n the drawings,-

Figure 1 is a vertical section of a machine for trimming blanks having my improvements connected therewith, taken generally along line 1-1 of Figure 2, which is the center iine of operation of the machine.

Figure 2 is a fragmentary plan view of the machine such as shown in Figure 1.

Figure 3 is a detail view of a portion of the main driving shaft with some of the parts connected theiicwith in section;

Figure 4 .is a cross-sectional view of a portion of the frame of the machine, illustrating therein an elevation of the stripper mechanism; and Y Figure V5 is a similar view of the frame,

the `parts in section being-takeny generally at substantially a right angle to Figure 4, and upon the line 1-1 of Figure 2, illustrating also another elevation of the stripper mechanism. l

A machine for trimmingblanks of the same general type as that herein shown is disclosed in Letters Patent No. 1,294,993, issued February 18, 1919.

Having more particular reference to the drawings in connection withV which like' reference characters will refer to corresponding parts, designates the -frame of the inachine which is supported upon suitable legs and having rotatably mounted therein a.

leer. serial no. 481,848.

main driving shaft 12 having cranks 18 and .14 connected therewith.

vCnlidably mounted upon a slideway 15 of the frame 10 and held in place by caps 16 is a main gate 17. On the front of this gate is a punch 18 which rests against a backing plate 19 and is supported in a holder 20, having a horizontal motion in a second holder 21. A clamp 22 secures the holder 2Q in av Atried position. Vertical adjustment .ot the second holder y21 is obtained by means .secondary gate 29. Supported in the main gate 17 and in the secondary gate 29 in line with each other are the pins or rods 32 upon which are liournaled the rolls and 31. Carried by the secondary gate 29 isV the pusher rod 33, one end of which extends through an opening in the punch 1S. This rod is adjustable relatively thereto in any convenient or well known manner.`

As operating means for the toggles 24 and 25, there vis provided a connecting rodA 34 which with the link 35 constitutes a sec.- ond toggle-operated by a connecting rod 36 which is connected with the main driving shaft 12 through the crank 13. The link 35 is mounted on bearings 37 supported by the frame 10.

LMounted so as to be vertically movable between the rolls 30 andV 31 and having contact therewith is the cam 38 which is secured to a connectinrT rod 39 which is also face 41, a high point 65, above which the' cam face iares outwardly` at a relatively sharp angle.

Connected with the inner wail of the frame 10 substantially opposite the forward end of the gate 17 is a die holder 43 within which is mounted a cutting die 42 and a planishing or finishingv die 44. ln the rear of the planishing die'is a backing plate 45 having an opening` 46 therethrough which communicates with an opening 47 through the frame 10. The ope ing` 48 through the die 42 is the same shape as the cross-section of the blank to be trimmed and the opening through the planishing die is also of the same shape, but slightly smaller in its dimensions. Both of these dies operate in a well known manner and the shape of the openings therein may be varied indefinitely,

as well as the manner of holding theirl in position, either separately or relatively. lt is not essential, of course, that a planishing die should be used and the same may be omitted if desired.

The operation of the mechanism above described is as follows,-assuniing now that a blank, as 49, is placed between the punch 18 and die 42 and in alignment with. the openings therethrough, the rotation of the main driving` shaft 12 will first straighten the toggle formed by the links 34 and 35, which will, in turn, straighten the toggle formed by the links 24 and 25 to move the main gate 17 to the left of Figure 1. Vilhile this is taking place the cam 38 which is operated by the crank 14 on the main driving shaft 12, will also he in motion, but the cranks 13 and 14 are so positioned that the first effect as the main gate 17 moves forward, is to cause a motion of the pusher rod 33 to the right of Figure. 1 relatively to the main gate 17, so that, when the punch 18 contacts with the blank.y the pusher rod will have been moved within said punch.

rlhe punch 18 forces the blank to the left of Figure 1 and into the die 42. At. this time the toggle formed by the links 34, 35, 25 and 24 are approaching their straightened position so that the pressure available for cutting blanks is very great. e

The adjustment the parts issuch that as shown herein the movement of the punch 18 forces the head of the blank 4S) substantially through the die 42, thus trimming the blank to a point that is approximately the top of the head thereof. lhe adjustment of the movement of the main gate 17 issuch that the relative position of the face of the punch 18 and the cutting;` face of the die 42 may be varied, but as shown here in the face of the punch 18 in its ex eine forward position is stopped ci .ier exactly i flush with or a slight distancey 'trom the face "of the die 42, preferably the latter.

During the forward motion of the main gate 17, the cam 38 by reason or its cam invasie faces 40 and 41 holds the outer end of the pusher rod 33 either flush with or just behind, as may be desired, the face of the punch 18.

`When the main gate 17 is in its extreme forward position, the cam rolls 30 and 31 are against the lower portion or the canr the cam roll 31 which rides over said cam roll bringing` the upper portion of the cam face 41 against said roll.

As this portion of the cam face curves outwardly a relatively sharp angle, a very quick and rapid movement is imparted to the pusher rod, after the blank is pushed through the planishing die and drops through the opening 47 into a receptacle conveniently arranged to receive it.

The relative movement of the pusher rod is about as follows:

As the punch 18 moves forwardly the end of the pusher rod 33 is either flush with the face or in rear thereof, as may be desired. After the punch 18 has engaged the head of the blank 49 and advanced the same to a point where the underside thereof is in contact with the cutting face of the die 42 the end of the pusher rod 33 is flush withy the end of the punch 18. While pressure is beingapplied by the punch 18, the face of the pusher rod remains flush with the end of the punch and travels at the same speed. `When the punch completes its forward movement the pusher rod, however, continues its movement at approximately the same speed, at this time applying` pressure to the blank and 'pushing it entirely across the cuttin edge of the die 42. 1When the blank is in this posi tion the speed of the pusher rod is accelerated to carry the blank entirely through the opening in the die 42 until `it contacts with the planishingry die 67 in the rear. lts speed is again retarded until the blank has about passed through the planishingdie when its speed is again accelerated to ,give the blank a kick or push that assists gravity in carrying' the blank out and away from the dies. The pusher rod now 'travels in a reverse direction at a very much increased speed, to clear tl e open space in front of the die 42 and permit the feeding` of ay new blank. These several relative speeds are acquired exact timed relation with the progress of the blank towardand through the dies.

The cam rolls 30 and 31 are maintained in Contact with the cam faces of the cam by the springs 64 which are connected at their opposite ends to the posts 63,yiiXed respectively in the mainA gate 17 and the secondary gate 29. Other means of course may be provided for maintaining this contact aside from the spring mechanism just described.

Preferably I arrange the toggle links 24 and 25 in their operative position so that, just before the pusher rod 38 forces .the blank throughthe die 42, the toggles 24 and 25 are moved beyond the center or broken slightly to draw the main gate 1'? 4to the right of Figure l, This relieves the pressure on the metal left uncut by the punch 18 and die 42, while the blank is being pushedL into the die 42 by the pusher rod 33 and give space for the chip formed by the trimming operation -produced from the forcing of the blank into the die 42 by the punch l8.

The planishing'die' 44 may be lubricated through the opening 67 in a well known manner.

It is common in mechanisms of'this character to support the shank of the blank 49 by a quill or other centeringdevice while the same is being passed through the die 42. Such mechanism is not herein shown as it is not a part of my present invention.

Any form of Amechanism may be utilized for presenting the blank 49 in a position wherein the aXis thereof is coincident with the axis of the ope-ning of the punch 18v and die 42, and therefore I havev not shown such mechanism, it being understood that thev blanks may be presented in such position either manually or automatically, as desired.A

Frequently the chip cut from a blank does not readily free itself and in order to insure a positive clearance of the chip, l have vprovided a stripper mechanism. This comprises a rock member 50 which is mounted upon a stud 5l fixed in a bracket 52 connected with'the frame l() and having anarm 58A connected therewith which carries a finger 54 upon the outer end thereof, and an arm 55 which is connected by the link 68 with the rock arm 58 journaled upon a stud 59 in the frame l() and carrying a roll 60 thereon which contacts with the periphery of the cam 6l fixed on the main driving shaft l2. The link 68 is connected with the arm 58 by means of the stud 56 and connecting pin 5T and with the arm 55 by a similar stud 69 and pin 70. f

` A spring 62 connected with the arm 53 and the frame. 10 exerts its tension so as to maintainV the roll 60 in contact with the cam 61.V The shape ofthe cam 51.1 and the positioning of the parts is such that when a blank isbe- Ving moved through the die 42, the upper end the face of the die 42 and clear therefrom any chips that may have adhered thereto.

What l claim as new and desire to secure by Letters Patent,is:

l. :in a mechanism of the character described, a pair of tools relatively movable toward and away from each other, a pusher rod for forcing the blank through one of the tools, toggle mechanism for actuatingonc of said tools, and cam mechanism for actuating said pusher rod, whereby the relative speed of movement of said pusher rod is definitelyv controlled.

2. In a mechanism ofthe character described, a pair of tools relatively movable toward and away from each other, a pusher rod forforcing the blank through one of the tools, toggle mechanisms for actuating vone of said tools, and means for actuating said pusher rod to give it an accelerated f movement during the final portion of its stroke in one direction.

3. In a mechanism of ther character ndescribed, a shaft having independent cranksY through one of the tools, toggle mecha-` nism for actuating one of said tools, and cani mechanism for actuating said pusher rod,fsaid toggle and cam mechanisms being actuated from the independent cranks of said shaft. Y

4. In a mechanism of the. character described, a shaft having a crank thereon, a pair of tools relativelymovable toward and away from each other,.a pusher rod for forcing a blank through one of the tools, toggle mechanism for actuating one of said tools, and cam mechanism for actuating said pusher rod having a connection with the said crank.

5. In a mechanism of the character dcscribed, a pair of tools relatively movable toward and away from each other. a pusher rod for forcing the blank through one of the tools, toggle mechanism Vfor actuating one of said tools. and mechanism comprising in part a cam having two operating faces thereon for actuating said pusher rod having a vertical reciprocatoiy movement be-V tween two parts having motion relatively to each other.

6. In a'mechanism of the character described, a `pair of tools relatively movable toward and away from cach other, a pusher rod for forcing the blankr through one of the tools, toggle mechanism for actuating oneof said tools, andl mechanism comprising in part a cam having two Voperating faces for actuating said pusher rod.y said cam having a vertical reciprocatory movement between rtwo parts that at different times have motion as a unit and relatively to each other. 7.111 a mechanism of the character deso shaped that the relative speed of motion of said pusher rod is made variable thereby at different points in its movement, a rotating shaft having,- a crank thereon, and means for actuatinpr said cam from the crank of said rotating shaft.

8. In a mechanism of the character described., a pair of tools relatively movable toward and away from each other, a pusher rod for forcing' the blank through one of the tools, toggle mechanism for actuating; one of said tools, and cam mechanism for 'actuating said pusher rod having` two cam faces thereon which flare outwardly relatively to each other for a portion of the length of said cam and one of said faces flaring outwardly at a relatively sharp angle near one end thereof.

9. In a mechanism of the character described, a pair of tools relatively movable toward andaway from each other, a pusher mechanisml for forcing the blank through one of the tools, and means, as a transversely movable finger, for clearing the face of one of said tools.

10. In a mechanism of the character described, a pair of tools relatively movable toward and away from each other, a pusher mechanism for forcingthe blank through one of the tools, toggle mechanism for actuatingone of said tools, means, as a transversely movable linger, for clearing;` the face of one of said tools, and means for actuatingsaid finger from the same shaft that actuates said toggle mechanism.

11. In a mechanism of the character described, acutting tool. a rotary shaft, stripper mechanism for moving;` any surplus metal upon the face of said tool, comprising` a rock member mounted so as to move upon an axis at substantially a right angle to said shaft. a finger connected with the outer end of said rock member, that travels across the face of said cutting tool, means for actuating said rock member in one direction from said shaft, comprising a cam connected with said shaft, a rock member actuated by said cam, and a link between said rock members, and means for maintaining contact with said cam of the part actuated thereby.

12. In a mechanism of the character described, a pair of tools relatively movable toward and away from each other. a pusher rod vfor forcingr the blank through one of the tools, toggle mechanism for actuating' one. of said tools, cam mechanism for actuating; said pusher rod, a shaft, means for actuating said toggle and cam mechanisms from said shaft, a rock lever, a finger connected with said rock lever, and means for actuating said rock lever from said shaft whereby in timed relation to the movement of one of said-tools it will move across the opening VinV toward and away from each other; a pusher mechanism for forcing the blank through one of the tools that will travel at different relative speeds during the stroke, one of the speeds being' substantially the same as that of the movable tool until the blank has passed the cutting` edge of the non-movable tool. v

15. In a mechanism of the character described, a pair of tools relatively movable toward and away from each other; a pusher mechanism Ifor forcing the blank through one of the tools that will move at the same speed as the movable tool while in contact with the blank and will continue atv approximately the same speed after said movable tool has come to rest and until the blank has passed the cutting edge of the'non-movable tool, and will travel at an accelerated speed for a limited distance thereafter.

16. In a mechanism of the character described, a cuttingdie; planishing die concentric therewith and adjacent thereto; a punch; means for moving said punch toward the cutting' die until the same is either flush with the face thereof or a point approxii'i'iating' the same; a pusher rod within said punch that travels at the saine speed as said punch while the same is in contact with a blank between said 'cutting die and punch, and continues at substantially the same speed after saidA punch has come to rest and until thel blank has passed the cutting face of said cutting die andthereafter continues its movement at an accelerated speed until the blank engages the pla-nishing die when the movement thereof is retarded while the blank is being advanced through the planishing die.

17. In a mechanism of the character described, a cutting die; a planishing die concentric therewith and adjacent thereto; a punch; means for moving said punch toward the cutting.,r die until the same is either lflush with the face thereof or apoint apwith a blank between said cutting die and punch, and continues at substantially the same speed after said punch has come to rest and until the blank has passed the cutting face of said cutting die and thereafter continues its movement at an accelerated speed until the blank engages the planishing die when the movement thereof is retarded while the blank is being advanced through the planishing die, and after said blank has substantially passed through said planishing die, travels at an accelerated speed and kicks or pushes the blank so that it may clear they said planishing die.

18. In a mechanism of the character described, a cutting die; a planishing die concentric therewith and adjacent thereto; a punch; means for moving said punch toward the cutting die until the same is either flush with the face thereof or a point approximating the same; a pusher rod within said punch; and means for actuating said pusher rod whereby the same will travel at the saine speed as said punch while the same is in contact with a blank between said cutting die and punch, and will continue at substantially the same speed after said punch has come to rest and until the blank has passed the cutting face of said cutting die and thereafter will continue its movement at an accelerated speed until said blanky engages the planishing die when thev movement thereof will be retarded while the blank is being advanced through the planishing die, and after said blank has substantially passed through said planishing die, will again travel at an accelerated speed and kick or push the blank so that it may clear the said planishing die, and will thereafter be withdrawn from said planishing and cutting dies at an accelerated speed.

19. In mechanism of the character described; means for trimming a blank, comprising a pair of tools, one of which is movable relatively toward the other; during which time the blank is cut in a plane parallel with the direction of movement of the movable tool, said movable tool stopping its movement before said cut is made entirely across said blank; and means, having a less cross sectional area than that of the blank for moving the blank beyond the cutting edge of the non-movable tool and at the same speed of movement as that of the moving tool and by reason thereof continuing the cut of said non-movable tool entirely across the face of said blank.

In testimony whereof; l have hereunto afxed my signature.

RICHARD LESTER WILCOX.

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