US1940883A - Turret punch - Google Patents

Description

Dec. 26, 1933. J ROLLINGS 1,940,883

TURRET PUNCH Filed Feb 11, 1932 ZSheets-Sheet l 1N VEN TOR.

A TTORNEYv Dec. 26, 1933.

E. J. ROLLINGS TURRET PUNCH INVENTQI'Q.

2 Sheets-Sheet 2 ATTORNEY.

Patented Dec. 26, 1933 UNITED "STATES. PATENTOFFlCE-i 7 murmur PUNCH 4 Ernest John.Rollings, Philadelphia, Pa. Application February 11, 1932. Serial No.59a254 3 Claims. (Cl. V 16491) The object of this invention'is to devise a novel construction and arrangement of a turret punch which is readily portable and which can be manually operated. V I v A further object of this invention is to devisea novel turret punch whereina deep throat is provided, said throat not being limited by either the radius or diameter of turret but can be made as large as required for the same diameter of turret so that large sheets can be punched a distance from the marginal edge ofthe sheet and wherein novel means are employed for multiplyingthe pressure applied to the punch so that in case of thick sheets the additional pres ure desired will be imparted at the beginning or the operative stroke of a punch. a

A further object of the invention. is to devise a novel turret punch ,wherein the punch' head and the die head are revolubly mounted in a novel manner and wherein novel means are provided ,for locking the heads in the position. to which they have been adjusted. i 1

Novel means are also provided for securing the punch holders in position with automatic means for taking up wear or back lash inpunch holders.

' With the above and otherobjects in View, as will hereinafter moreclearly appear, my invention comprehends a novel construction and. arrangement of a turretpunch. 7

It further comprehends a novel turret punch having a. novel construction and arrangement of a frame providing a deep throat, a novel construction and arrangement of rotatable punch and die heads, novel means for locking said heads in alignedposition and for. centering the heads if they are not exactly aligned with thelocking mechanism. v. H I 'f It further. comprehends novel mechanism controlled by the operator for applying pressure to the punch-sothat an improved mechanical .ad-

vantage will be obtained when punching. thick material as compared with other methods of obtaining pressurewhich are not eflicient on thick material. This mechanical advantage is practically equal when punchingany thicknessof material.,

It further comprehends novel "means for locking a punch carrier in. position in thehead with automatic, wear adjustment. w Othernovel features of cOnstructionandadvantage will hereinafter more clearly appear in the detailed description and the appendedclaims.

. ,For the purpose of illustrating the invention I haveshown in' the accompanying drawings a typical embodiment'ofit, which, in practice, will bodying my invention. The frame is in the form sprocket wheel 16 give satisfactory and reliable results. It is,.however, to-be understood that the various instrumentalities of which my invention consists can be variously arranged and organized, and my invention isnot limited to the exact arrangement and organization of these instrumentalitie's as herein set forth. V

Figure 1 is a side elevation of a turret punch embodying my invention.

Figure 2 is a front elevation thereof, partly broken away. o

- Figure 3 is a sectional elevationtaken' through the center of the punch.

Figure 4 is a detailed viewof the control for the locking plungers which look thepunch holders (0 and die bolster in adjusted position.

Figure 5 is a top plan view of alo'cking plunger. I r v Figure 6 is a detailed view of a punch carrier and its locking plunge'n' Similar numerals of reference indicate corresponding parts. Y 1

Referringto the drawings:i- V 1 designates the frame of .a turret. punch emof a yoke having a deep throat 2 in order to enable it to-receive'sheets which can be punched a considerable distance from the edges of thesheetsr 3 designates the die bolster". which is, rotatably mounted. on a stud 4 secured .to the frame. The die bolster has secured to it in any desiredmanner, the dies 5. 6 designates the punchholder which is rotatable on a stud 7- secured to the frame 1. The die bolster 3 is provided'with the circumferentially spaced recesses S-opening through its periphery, opposite walls of such recesses convergingout'wardly. In

a similar manner the punch holder 6 is provided with the circumierentially spaced recesses 9 whichopen through its; periphery and opposite walls of such recesses divergeoutwardly.

The punch holder and the die bolster are operatively connected so that-they can besimultaneously adjusted by a partial rotation and for this purpose the die bolster is provided with a sprocket wheellO around which passes a chain II, which also passes around an sprocket wheel 12 fixed to a shaft 13 suitably journalle'd in the frame of the machine.

The punch holder, 1n a similar manner, has fixed to it a sprocket wheel-l4 around which passes a chain 15 which also passes around a fixed to the'shaft 13. It will thus be seen that when a partial rotation is imparted to the punch holder the die bolster will be moved in unison therewith.

17 designates a locking plunger for the die bolster, slidably mounted in the frame 1 and at its forward end it has opposite sides converging forwardly so that it willaccurately align the die bolster when it is moved forwardly into a recess 8 of such die bolster. p

A spring 18 is inserted between the rear end of the locking plunger and the frame thus tending to move the plunger forwardly. This spring is of such length that it limits the rearward move ment of the locking plunger.

In a similar manner a locking plunger 19 of the same construction as that of the locking plunger 17 is movably mounted'in the frame and adapted to enter a lockingrecess 9 of the punch holder in registry therewith, and aspring 20 is provided to effect the forward locking-move+.

ment of the plunger. The rear ends of the plungers 17 and 19 are connected by a cross bar 21, 'the'plungers being slotted to receive the bar, and the bar being secured in position by means of the pins 22. The bar is provided'with a slot v23 into which extends a stud 24 eccentrically carried by a shaft 26, journalled in'the machine frame andprovided with an actuating handle 27. This handle 27 is arranged to lock the plungers either into registry with the turret or 'to lock the plungers out of the turret.

. In orderto compensate for wear I provide a take-up mechanism for the chains 11 and 15 it being seen that their' journal boxes 28 are mounted between the opposed adjusting screws 29 in threaded engagement with the journal .brackets 30. 1

The upper part of the yoke of the frame near the open end of the throat is provided with a reciprocable' ram 31 which is-pivotallyconnected with a toggle arm 32 by means of a rod 33. The upper arm of the yoke of the frame has fulcrumed on it at 34, a segment lever 35 which is in meshwith a gear 36 fixed to a shaft 3'7 which latter is provided with an actuatingarm 38, ar-

ranged to make approximately one-half oi a revolution. The toggle arm .32 is pivotally connected at 39 to the arm 35 intermediate its fulcrum point and'the gear 36 so that it has normally an inclined position. It is to be noted that the fulcrum point of thelever 35 is in a different vertical plane from that'of the median line of the ram 31. I The ram at its forward end is slotted as at 40 to receive the upper ends of grooves or slots 43 into which extendthe plungers the punch carriers 41. These punch carriers 41 at their forward end are adapted to receive the punches42 connected therewith in any desired or conventional manner; As illustrated the punch carriers are recessed to' receive the punches. v V

The punch carriers l-l are provided with the 4e slidably mounted in the punch holder 6 and springs 45 are provided which tend to move the plungers 44 forwardly into fractional engagement with the punch carriers 41 so that the latter are retained inassembled position with respect to the punch holder 6. The springs 18 punch holder or head 6 and the dies 5 are assembled in the die bolster. The handle 2'7 is actuated to cause the disengagement of the locklocked to allow the locking plungers to ride on the periphery of the turrets.

A further alignment of the turrets allows the plungers to snap into the locking recess of the punch holder and die bolster to accurately align them in position,

the handle 27 being then used to lock them. The 'sheetor other member to be punched is inserted intothe throat 2 and the handle 33 is moved forwardly thereby causing the downward-or operative stroke of the ram 31. e

' The cross bar 21 which connects the locking plungers 17 and 19 is floating so that it is necessary to actuate only a single handle 27 to operate and lock both plungers. When such handle 27 is partially turned, the locking plungers will be moved into unlocked position. If at such time only one plunger was in unlocked position, the other plunger will be positively move into its unlocked position. e For purpose of illustration I have shown chains employed for interconnecting the punch holder and die bolster but it'will be apparent that other equivalent mechanical means, such as, for example, gears, can be employed to accomplish the same result.

The controlling mechanism for the ram is such that a toggle arrangement is provided which will impart a powerful thrust to the ram so that the turret punch can be employed for punching com-' paratively thick sheets.

In Figure 6 I have shown more in detail the manner in which: a locking plunger cooperates with a punch carrier to retain it in'position, it being seen that the punch carrier is provided with a groove or slot, opposite walls of which diverge outwardly, and the cooperating end of the locking plunger is correspondingly shaped to engage the walls of the recess and overhang the periphery of the punch carrier, thus providing automatic and accurate take up for wear.

While I have illustrated my present invention as designed to be manually operated it will be apparent that it may be power driven if desired, it being simply necessary to interconnect the shaft of the driving motor with the gear 36.

It will now be apparent that I have devised a new and useful turret punch which embodies the features of advantage enumerated as desirable in'the statement of the invention and the above description, and while I have, in the present in stance, shown and described a preferred embodiment thereof which will give in practice satisfactory and reliable results, it is to be understood that this embodiment is susceptible of modification; in various particulars without departing from the spirit or scope of the invention or sacrificing any of its advantages.

Having thus describedfmy invention what I claim as new and desire. to secure by Letters Patent, is: i

1. In a turrent punch, a frame having a deep throat, a diebolster rotatably mounted in said frame, a punch holder rotatably mounted in said frame, the depth of said deep throat being indeiio able connections to both said punch holder and said die bolster whereby they can be simultaneously rotatably adjusted by rotating said shaft,

means to align and lock said punch holder-and die bolster, a ram reciprocable in said frame, a toggle arm connected with said ram to actuate it, and manually actuated means to actuate said toggle arm.

2. In a turret punch, a frame having a deep throat, a die bolster rotatably mounted in said frame, a punch holder rotatably mounted in said frame, a shaft mounted in said frame, a chain connecting said punch holder with said shaft, a chain connecting said die bolster with said shaft, manually actuated means to simultaneously lock said punch holder and die bolster in aligned position, a reciprocable ram, and means to actuate said ram.

radiusof said die bolster and 3[ In a'turret punch, a frame having a deep throat, a die bolster rotatably mounted in said frame, a punch holder rotatably mounted in said v frame, a shaft, sprocket wheels thereon, chains engaging said-sprocket wheels and said punch holder and .die bolster to simultaneously adjust them, said punch holder and die bolster having recesses with opposed inclined walls opening through their peripheries and circumferentially spaced, locking plungers having opposite sides inclined, and movably mounted in said frame to enter said recesses, resilient means to effect the forward movement of said plungers, manually actuated means to effect the rearward movement of said plungers and to lock them in both their forward and rearward positions, a reciprocaole ram, and means to actuate said ram.

ERNEST JOHN RoLLINGs.

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