US364142A - Power-press - Google Patents

Description

1N. c. STILBS. n

2 Sheef-Sheet POWER PRESS.

(Nd Model.)

Np. 364,142'. Patented May 31 1887.

(No Model.)

.'I 2 Sheets-Sheet 2. N. C. STILES.

POWER PRESS.

No. 364,142. Patented May s1, 11887.

ci/M!" ings, and the letters of reference marked UNITED STATES PATENT OFFICE.,

NORMAN C. STILES, OF MIDDLETOVN, CONNECTICUT.

POWER-PRESS.

SPECIFICATION forming part of Letters Patent No. 364,142, dated May 31, 1887.

pplication filed December 13, 1F86. Serial No. 221,406. (No model.)

provements in Power-Presses; and I do hereby declare the following, when taken in connection with accompanying two sheets of drawthereon, to be a full, clear, and exact descrip tion of the same, and which said drawings constitute part of this specification, and rep' Figure 1, a front view; Fig. l, an inside view of one side ofthe frame, showing the vertical guiding-groove O with the shaft bearing therein; Fig. 2, a transverse section through the slides on line a' x of Fig. l; Fig. 3, a vertical section through the slides, showing side view of the toggle in the'contracted or up position; Fig. 4, substantially the same parts as in Fig. 3, showing the toggle in the extended or down position; Fig. 5, amodiiic'ation in the connection between the punchslide and the toggles; Fig. 6, a vertical section through the fixed die-holder; Fig. 7, a perspective view of thelower portion of the press, illustrating the adjustment ofthe fixed die.

This invention relates to an improvement in that class of power-presses in which two operations are to be performed, commonly called double-action power-presses --as, for illustration, in drawing or capping sheet metal the sheet or blank to be operated upon lies flat upon the surface surrounding the die into which the metal is to be forced, and so that as the punch approaches the metal itwill strike the surface of the metal upon the side opposite the die upon which the sheet lies, and will force the metal down into the die, drawing, contracting, or expanding the metal, so as to bring it to the shape of the space between the punch and the die when the punch stands within the die. 4

Were not some provision made, the portion of the fiat sheet extending beyond the die would be fulled or puckered in the process of beingdrawn into the die, so as to produce uneven work. To obviateV this difficulty, a holder is provided which will rest upon the sheet of metal around the cavity in the die, so as to hold the sheet flat and permit it to be gradually drawn into the die. The two operations before referred to are one to thus hold or bear upon the blank while being drawn and the other to operate the punch. The first usually consists of a slide, presenting a dat surface toward theY die, and so that after the blank or sheet has been laid over the die this i holding slide descends in advance of the punch and comes close upon the side of the blank or sheet opposite the die, and so as to grasp the blank between the die and the face of the said slide. Then as the die comes upon the'blank within the said slide and over the cavity in' which existed in the then common devices for g operating this holdingslide. Up to that time the holding-slide had been generally operated by means of a cam on the.drivingshaft,which would force the holder down upon the blank, and as a very nice adjustment is necessary between the two holding or grasping surfaces it required but a slight wear of the cam or surface upon which it worked to disturb .the proper relation of these two surfaces. The

object of that invention was principallyto overcome that difficulty and devise a mechanism in which the wear would be slight and not materially affect the proper relation ofthe holding-surfaces. To that end that invention consisted in combining the slide which carried the movable holding surfaces with a toggle, through which, from the driving-shaft, the reciprocating movement was imparted to the said holding-slide, and in that invention the toggle was operated directlyfrom the drivingshaft,either by a cam thereon or some projec tion extending therefrom. y'

My present invention is an improvement upon that described in my said patent, and has-- for its object amore simple and effective arrangement and operation of the toggle.

A A represent the two sides or uprights ofthe apparatus, in the upper part of which the ICO driving-shaft B is arranged in suitable bearings,and so as to revolve by the application of power thereto in any known manner, not necessary to be illustrated in this application.

C represents a slide arranged to receive an upand-down reciprocating movement in vertical guides in the frame. Within this slide C is the punch-carrying. slide D, to which reciprocating movement is imparted, by means of a crank or eccentric, E, on the driving-shaft, through a pitman, F, in the usual manner and as in my patent before referred to, so that each revolution of the driving-shaft imparts a full up-anddown reciprocating movement to the punch carrying slide. works through the slide Cin the usual manner and as seen in Figs. 2 and 3.

The slide C carries the holdingsurface G, which in its downward movement is adapted to come so close to the face of the die H as` to grasp the sheet or blank laid thereon, as in my previous patent; and this downward movement of the slide C is such as to bring the holding-die Ginto thegripping condition upon the blank before the punch reaches the blank and hold it upon the blank while the punch continues its descent into the die, and so that the metal is drawn into the die from between the holding-surface and the face of the die in the usual manner. Then the slide C rises, as well as the punch.

To impart the np-and-down. reciprocating movement to the slide C, a pair of toggles are provided, each consisting of one link, I, hung by its lower end to the slide C, as at a, and s0 as to swing in aplane at right angles 'to the axis of the driving-shaft, and a second link, J, to which the upper end ofthe link I is hung, as at b, the other end of the links J hung upon a fixed bearing, d, in the frame, these bearings (here represented as trunnions) extending from the links into the frame, as seen in broken lines, Fig. 1,'and so that as the links are in their straight or extended position, as seen in Fig. 4, the slide C will be forced to its extreme down position, and when the links are in the contracted position, as seen in Fig. 3, the slide C will be raised to its highest point. Each of the links J is constructed with a slot, K, parallel with a line between their two connectingpointsb d. At the upper end this slot is curved inward, as at L. Through these slots is a transverse shaft, M, and on the upper end of the punch-slide D bracket-arms N N are fixed or made a part of the slide, through which the said shaft M extends, as seen in Fig. 1, and so thatin theup-and-down movement of the punchslide the shaft M will be carried with it. The shaft extends through the slotsin the two slides and into a vertical groove, O, in theframe at each side, and in that groove there is preferably arranged a sliding box, I), in which the ends of the shaft M rest, the sliding boxes P forming the bearing for the shaft M. In each of the slots K the shaft is preferably provided with an anti-friction roll, R, which will freely work in the slots of the links as the puneh-slide is The punch slide D,

moved up and down. The shaft M is in such relation to the slot that when the parallel portion K of the slots stands in an upright position they will be in a vertical plane, as seen in Fig. 4, and'so that the shaft M, under the movement of the punehslide, may move up and down through the parallel portion of the slot K without effect upon the rtoggles; but as the punch-slide rises and brings the shaft M to the upper end of the parallel portion of the Slots, and as it (the shaft) cannot turn from its vertical path, it acts as a cam on the curved portion of the slots, and as it completes its upward movement it passes into the curved portion oftheslots and turnsthelinksoutward from their straight or extended position into the contracted position, as seenin Fig. 3, and this position occurs when the punch-slide is in its extreme nppositon. Then as the punch-slide commences its descent the shaft M also descends, and,working through the curved portion of the slots, quickly throws the links into their extended position, and consequently quickly forces down the holding-slide C to its extremey position, as seen in Fig. 4, this extreme down positionoccurring just as the shaft M passes into the straight or parallel portion of the slot. Then the punclrslide continues its descent without effect upon the holding-slide. Thus it followsthat the punch-slide descends to its holding position considerably in advance ofthe punch, and remains in that holding position until the punchslide approaches its extreme up position, and the operation of the holding-slide is produced without direct counection with the driving-shaft.

I have described and prefer the arrangement of the shaft as supported in the brackets and slide and extending into the sides of the frame, because the frame takes the bearing of the shaft in the operation of the links and relieves the slide; but the links may be operated simply by trunnions projecting from the slide, as seen in Fig. 5, the trunnions performing substantially the same operation as the shaft, and may be considered as a part of the shaft;

As the links must always bring the face of the slide to a certain point, and cannot there- ,fore be convenient] y adjustable, it is necessary to make the face. of the die adjustable with relation to the holding-face of the slide, in order that the two faces may `come into the proper relative position to grip the sheet.' To this end I construct the die-holder S (see Fig.

' 6) of tubular shape, screw-threaded upon its outer surface, and construct the bed with an opening, T, through which the tubular portion of the die-holder may extend, and on the tubular portion of the die I place a nut, U, adapted to rest upon the bed around the opening therein, and as seen in Fig. 6.

From the die-holder bolts 2 extenddown through ears 3 3 on the bed, the bolts being fixed in the dieholder, and so that as the holder is raised or lowered the bolts will move accordingly, and I prefer to arrange these bolts two in front, as seen in Fig. 7, and with two-likebolts attherear. (Not shown.) These bolts, below the ears 3, are each provided with a nut, 5. Vhen it is desired to adjust thelower or fixed'die, the'holding-slide is brought to its lowest position, a. blank laid upon the lower die-holder, the nuts 5 are unscrewed, and then thenut U turned to raise the die-holder up until the blank will be properly gripped between the face of the holding-slide and the die below. This done, the nuts 5 are returned up to'a hard Abearing, and so as to securely lock the die-holder in place.

If`it.be required to drop the lower die, then the nut U is turned accordingly, and the nuts 5 brought up to a bearing, as before. By this arrangement not only is the die-holder Afirmly held, butits level is maintained, and all liability to displacement his avoided.'

rIo adj ust the punch with relation to the die, I construct the punch l/V, or may be the punchholder, separate from 'the slide D, and of cylindrical shape, and in the lower end of the slide D, I make a corresponding cylindrical cavity, Y, (see Fig. 3,) and from the upper end of the punch W', or punch-holder, as the case may be, is a concentric screwshauk, @which extends up into a corresponding cavity in the punch-slide, and in the slide is a transverse recess, f, in which a nut, g, is arranged, threaded corresponding to the. shank e of the punch or punch-holder. This recess f opens to the front of the punch-slide D, as seen in Fig. l, so that access is had to the nut g. The nut is provided with radial holes or other means whereby instruments may be applied to rotate the nut. y

The punch or lholder Wis grooved vertically, and in the slide a set-screw, h, is introduced, the end of which enters the vertical groove in the holder W, as seen in Fig. 2, to prevent its rotation,and so that it may be posi- Lively set when once adjusted.

'Io adjust the punch or holder, the nut g is turned to raise or lower the punch or holder, as the case may be, into its proper relation with the fixed die.

Each punch may be constructed with a shank, e, screw-threaded corresponding to the nut g, or it may be a holder adapted at its lower end to receivev the punch, as indicated in broken lines, Fig. 3, by the term punchholder.77 Therefore I wish to be understood as including` the punch itself as an integral part of the holder, if such construction is desi rable.

It is desirable,if not necessary,that the holdin g-surfaccs should be in perfect parallel planes in order to make an even pressure upon the sheet between them. However perfectly the machine maybe bnilt,thereis liability of some degree of variation in changing the holdingsurfaces or thedics. To provide for such adjustment of the holding-surfaces, I construct the holding-slide with an adjustable face-piece, 6. (See Fig. 3.) This'piece corresponds in outline to the lower end of the slide,

On the adjacent surfaces of the holdingpiece 6 and the lower end of theslide I form a projection, 7,l on the one part, with a corresponding cavity in the other part, the projection being represented in Fig. 3 as made on the holding-face piece 6. The surfaces bctween the two parts outside of this projection 7 do not come to a bearing-that is, a space, 8, is leftrbetween the two parts around the projection 7. rIhe lower end ofthe slide projects outward to form a flange, 9, and through this flange several screws, 10, are introduced into the facepiece 6 below, the screws being outside the projection. 1

I do not wish to be understood as claiming, broadly, a die-holder having ascrew-threaded shank set into a recess in the bedof the press, with a nut on the shank, as such, I am aware, is not new.

I claiml. In a double-action power-press, the combination of thel vertical slidel carrying the movable holding-surface, a vertically-movable slide carrying the punch, mechanism, substantially such as described, to impart reciprocating movement to the punch-slide, and a toggle or toggles, one link, I, of which is hung to the slide which carries the holding-surface, the other link, J, hung to axed point in theframe, .the said link J constructedwith a slot parallel with the line between its fixed point of connection with thev frame and its point of connection with the other link, I, the said slot curved at the xed end and toward the fixed point, the punch-slide provided with an extension into said slot and so as to wo'rk therein under the reciprocating movement of theV punch-slide, substantially as described, and whereby under such up-and-down reciprocating movement of the slide the corresponding contracting and extending'movements are imparted to said link, and thence to the holdingslide.

2. In a double-action power-press, the combination of the vertical slide carrying the IOO.

IIO

movable holding-surface, a vertically-movable v slide carrying the punch, mechanism, substantially such as described, to impart reciprocating movement to the punch-slide, a toggle or toggles consisting of the two pairs of links I J, hinged together, the lower end of the links I- hung ,to the said holding-surface slide, the upper end of the links Jhung to a fixed point in the frame, the said links J constructed with a slot, K, parallel with the line between the xfed Ils' point upon which the said links J are hung and the point by which they are connected to the other links, I, the upper end of the said slot K turned inward toward the fixed point upon which the links J are hung, a shaft, M, fixed to the punch-slide and extending through the slotin thelink or links J, and the frame provided with vertical grooves O, into which the ends of the said shaft ll extend as vertical working-guides, substantially as described.

3. The herein-described adjustment for the xed die of power-presses, consisting of the-` die-holder S, constructed with a tubular shank v said cavity, the punch-holder arranged in said cavity and constructed with a screw-threaded r 5 shank, e, extending vertically upward from said cavity through said recess j', and a nut, g, in said transverse recess corresponding in thickness to the height of said recess, the said nut y screw threaded corresponding to the 2o screw-threaded shank `of the die'holder, all substantially as described.

, NORMAN C. S'IILES. Witnesses:

FRED C. EARLE, JOHN E. EARLE.

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