US1726731A - Press - Google Patents

Description

P 1929 w. D. BARTLETT El AL 1,726,731"

PRESS Filed Aug. 15, 1923 I 4 Sheets-Sheet 1 vid ' Arrae/vsx Sept." 3, 1929. w. D. BARTLETT ET AL I PRESS Filed Afug 13, 1923' 4 Sheets-Sheet 2 Ill mi P 1929. w. D. BARTLETT ET AL 1,726,731

' PRESS Filed Aug 13, 1923 4 Sheets-Sheet v 3 Aime/vex Sept. 3, 1929.

w. D. BARTLETT ET AL PRESS 1 Filed Aug. 15, 1925 4 Sheets-Sheet 4 Patented Sept. 3, 1929.

UNlTED STATES PATENT oFFicE.

YVZ'LLIAM D. BARTLETT AND SYDNEY MARQUIS, OF CLEVELAND, OHIO, ASSIGNORS TO THOMPSON PRODUCTS, INCORPORATED, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

PRESS.

Application filed August 13, 1923. Serial No. 657,216.

Our invention relates to presses adapted for use in forming articles from heated metal blanks by means of a punch and dies, and particularly adapted for use in forming poppet valves or ar icles having a similar shape.

The object of our invention is to provide a press by means of which such above-named articles, and particularly poppet valves, may be economically and eiiiciently manufactured. More specifically, our invention consists in an arrangement of parts whereby the least time intervenes between the act of inserting the hot blank in the die and the forming operation; and also whereby the operation is a single or pressing operation as distinguished from an upsetting or a forging operation, which latter include a succession of blows.

By cutting down the said interval of time, the forming operation is effected at a time when the metal is at a maximum temperature; and by adopting a pressing operation, the speed of production is greatly increased as compared with the heretofore practiced methods, advantages which will be obvious to those skilled in the art.

The primary characteristics of the machine which we have devised for efiecting the above-disclosed object, consist in providing a rotatable work-holder having an exterior journal mounted in a frame bearingmember, and having a plurality of circumferentially spaced dies; together with a cooperating reciprocable punch having a path of reciprocation transverse with respect to the holder-axis, the latter being placed with reference to the frame of the machine, so that the dies are readily accessible for feeding in the blanks and for ejecting and re moving the finished product. A further characteristic of this machine consists in so arranging the parts that the axes of the driving shaftand the intermittently rotatable work-holder are parallel, as a result of which arrangement the exterior of the workholder becomes accessible. In this case the said axis extends transversely of the machine so as to intersect the two upright framemembers on which are formed the guides for the reciprocable punch.

The annexed drawings and following de scription set forth in detail certain means embodying our invention, the disclosed means, however, constituting but one of the various mechanical forms in which the principle of the invention may be employed.

In said annexed drawings:

Figure 1 represents a front elevation of a press embodying our invention.

Fig. 2 represents a righ -hand side elevation.

Fig. 3 represents a fragmentary side elevation of the machine as viewed from the plane indicated by line IIIIII, Fig. 1.

t represents, upon an enlarged scale, a fragmentary vertical section taken upon the plane indicated by line IVIV, Fig. 1, and viewed in the direction indicated by the arrows.

Fig. 5 represents a section taken upon the plane indicated by line VV, Fig. 4.

Fig. 6 represents a section, upon an enlarged scale, taken upon the plane indicated by line VI'VI, Fig. 1.

Fig. 7 represents a section taken upon the plane indicated by line VII-VII, Fig. 6.

Fig. 8 represents, upon an enlarged scale, a section taken. upon the plane indicated by line VIIIVIII', Fig. 5.

Fig. 9 represents a section taken upon the plane indicated by line IXIX, Fig. 8.

The illustrated embodiment of our invention includes a main frame comprising two upright-s 11, a top cross-member 2, and a bottom or saddle-member 3, these members being all secured together by means of tie-rods 4 and nuts 5, as will be understood.

The bottom or saddle-member is made very massive and has fore and aft extensions 33, which act as the base resting upon the support or floor 6, Figs. 1 and 2. The upper surface of this saddle is formed with the centrally located arcuate bearing 7 of cylindrical form, in which is mounted the cylindrical work-holder 8, having the exterior journahsurface 9 fitting the bearing 7 Figs. l and 5. As shown, the axis of this work-holder is horizontal and passes longitudinally through the members 1, so that the exterior cylindrical surface of the holder is readily accessible from the front or rear of the machine, as shown in Fig. 4.

The uprights 1 are provided with vertical guides 10-10, upon which slides a reciprocable punch-head 11, Fig. 1. This head is connected by means of suitable toggles 12 with a countershaft 13 upon which is mounted a gear 1 driven by pinion 15 mounted upon a horizontal shaft 16, upon which is mounted a flywheel 17, together with fast and loose drive pulleys l3 and 19 respectively, all as will be readily understood and as is common in the art.

The lower end of the reciprocable head 11 carries fixed but removable punch 20 and also two fixed but removable positioning ains 21- 21, the axes of the punch and pins all lying in a vertical plane passing through the axis of the rotatable work-holder 8, as will be apparent from an inspection of Figs. 4 and 5.

The rotation of the fixed driving pulley 18 will, it is obvious, effect the reciprocation, in a vertical direction, of the head 11.

Secured to the shaft 13 is a beveled pinion 22, 1, which meshes with a second beveled pinion 23 mounted upon the upper 'end of an upright shaft 24 to whose lower end is secured a beveled pinion 25 meshing with another beveled pinion 26 mounted upon a horizontal shaft 27, Figs. 4 and 7 The left-hand end of this shaft 27 has fixed thereto a crank-arm 28 provided with a counterweight 29, and, at its outer end, with an anti-friction roller 30, Fig. 3.

The work-holder 8 is formed with a central axis bore 31, Fig. 5, and projecting into the left-hand end of this bore is the righthand end of a stub-shaft 32 which is keyed to the rotatable holder 8, said shaft extending through the bore 33 in the saddle 3. To the left-hand and outwardly projecting end of this stub-shaft is keyed a star-wheel 34, Figs. 3 and 5. This wheel is provided with a plurality (in this case six) of equidistantly spaced radial slots 35.

The anti-friction roller on the arm 28 is adapted to successively engage these slots 35 and hence intermittently rotate the stub shaft and hence the work-holder, as will be readily understood, when the said arm is rotated as a result of the rotation of the previously described connected parts.

The QXLCTlOl' cylindrical surface of the work-holder is provided with six sets of cylindrical and radially located holes 36, Figs. 1 and 7, each pair having its axes lying in the same plane intersecting the axis of the worl holder, and being separated from each other a distance equal to that of the posi tioning pins 21. The diameters of these cylindrical holes 36 are such that the said pins 21 wil snugly fit therein. The stroke of the head 11 is such that when the axes of the holes 36 are alined with the axes of the pins whose axes also lie in the plane of the axes of holes 36. These recesses are cylindrical in form and each is adapted to receive a fixed die-block 38, which is secured into place by means of bolts 39 as shown in Fig. 5. These die-blocks are annular and the interior surfaces of each forms the cylindrh cal die-receiving space 40, the bottom of this space being formed by a cylindrical block 41 seated in the bottom of each recess 37. In each die-receiving space is a die 42 which is adapted to receive a blank and in cooperation with the punch 20 form the required article, in this case a poppet valve.

Each bottom block 41 is formed with a cylindrical hole 41 which connects with a radially disposed bore 43 whose inner end connects with the central bore 31 of the work-holder 8 as shown in Fig. 4.

Into the right-hand end of the bore 31 extends a fixed stub-arbor 44 mounted into right-hand side of the saddle 3 as shown in A. 5. The inner extremity of this arbor formed with a cam 45, the cross-sectional form of which is clearly shown in Fig. 4.

In each of the bores 43 is located a slide 46 fixed against rotation by means of a key 47 engaging a groove 48, Fig. 8. To each such slide is secured an ejector-pin 49 which is adapted to pass into the opening 41 in the bottom block 41. A coil-spring 50 is interposed between said slide and the inner surface of the block 41. The inner end of each slide is provided with an anti-friction roller 51, these rollers being engaged by cam 45. This cam is so formed as to permit the coil-springs to withdraw the ejector-pins 49 a distance such that the blank 52, when the die is in its uppermost position, will be completely seated in the required position in such die. As rotation of the work-holder proceeds, these ejector pins are caused, as a result of the engagement of the cam 45, to eject the completed articles from the dies as shown in Fig. 4, after which the articles are stripped from the dies as will be hereinafter described. This cam is furthermore so formed that, as the dies proceed in their travel after the articles have been stripped therefrom, the pins will be withdrawn so as to permit the reinsertion of the blanks into the dies for another operation, as shown in Fig. 4.

The dies 42 are removably held in the die-blocks 38 by means of inclined screws 53 as shown in Fig. 4.

On the right-hand side of the machine, as shown in Figs. 2 and 6, is mounted a reciprocable slide 54, whose intermediate portion is U shaped as shown, and provided with two anti-friction rollers 5555. These rollers are engaged by a cam 56 which is secured to the previously described shaft 27, so that as this shaft rotates the cam will effect the reciprocation of said slide 54.

The end of this slide is connected by means of links 54 with a rock-arm 57 mounted on the saddle 3 as shown in Fig. 7, the other end of which is connected, y means of a link 58, with a reciprocable stripper-bar 59. This stripper-bar is formed on its inner end with a recess 60 adapted, when in the path of rotation of the partially ejected blank, to receive the head thereof, and, upon withdrawal, pull said blank out of and strip it from the die.

The diameter of the shaft 32 is made slightly less than the bore 33, and the diameter of the inner end of arbor la is made slightly less than the bore 31 in which it is seated so that the entire thrust which is applied to the work-holder 8 during the operation of forming, is transmitted to the bearing 7 of the saddle 3. This saddle is preferably mounted solidly on a concrete foundation of suitable dimensions.

The above described device is applied and operates as follows:

The gearing is so designed as to effect the direction of rotation from the front to the rear of the machine as indicated in Fig. l. The left-hand side of the machine as illustrated in said Fig. 42 is the front, and the operator who feeds the blanks into the dies stands at such front of the machine. Assuming that the pulley 18 is being driven by a suitable belt (not shown), the head 11 is reciprocated as previously described and at the same time the star-wheel, through its described connections, is rotated intermittently in the direction indicated by the arrow in Fig. 3. The connections are such that the cylindrical holes 36 are in vertical alignment with the positioning-pins 21 during the periods of rest of the work-holder. the punch 20 being also vertically aligned with the corresponding die during such periods. As the head descends, therefore, the positioning-pins 21 enter the holes 36 and accurately and firmly position the work holder. while the punch enters the die aperture and performs its work.

A pie-heated blank is fed into each die as it reaches that position which precedes its uppermost vertical position so that the only time that elapses from the time it is fed into such die until it is operated upon, is that which is consumed during one-sixth of the revolution of the work-holder plus such portion of the period of rest as may be involved.

After the punch has performed its operation. in cooperation with any given die. the work-holder moves so as to carry such die to the next position, during which time the cam 45 actuates the corresponding ejector to push the blank outwardly so as to project from the exterior cylindrical. surface of the workholder, as shown in Fig. 4. At the conclusion of the next intermittent movement,

the head of the finished article enters the opening 60 of the stripper, and the connections of the latter with the driving mechanism are such that this stripper will be actuated to pull the finished article (the valve in this case) out of the die and dischar e it at the back of the machine during the period of rest which succeeds the imparting of th above described position with reference to said structure. e prefer to so arrange the parts, as shown, so as to effect the stripping operation while the die occupies its second position following that in which the forming operation is effected, and in which the axis of the die forms an obtuse angle with vertical plane, so that the final removal of the article will be assisted by gravity. The succeeding; movement carries the die back into its previously described receiving position, during which time the cam 45 permits the coilssprings 50 to withdraw the ejector-pins 49 from beneath the dies so as to allow the article to be properly placed in the latter.- This pin withdrawal is preferably so controlled that when the die is in its receiving; position the bottom of the blank will contact the outer end of the ejector-pin at the time when the outer end of the blank is substantially flush with the outer cylindrical surface of the work-holder as shown at a in Fig. 4. By the time it reaches its uppermost position, the pin l9 will have been withdrawn completely so as not to interfere with the operation of the punch, all as will be readily understood by those skilled in the art.

The abovedescribed operation, of course, applies to each die.

It will therefore be seen that the feeding operation may be effected continuously and one of the required articles formed for each complete stroke of the head 11.

lVhat we claim is:

1. In a press for manufacturing valves or the like, the combination of a frame including a saddle formed with an arcuate bearing surface; a cylindrical work holder whose outer cylindrical surface forms a journal and is seated and rotatable in said bearing surface; a reciprocable head and punch mounted thereon: said holder provided with a plurality of dies adapted to cooperate with said punch; connections between said head and holder whereby the latter are coordinated to effect such cooperation; the mounting of the head in such saddle bearing being made such that the saddle will receive substantially the entire thrust effected by said punch.

2. In a press for manufacturing valves or the like, the combination of a frame comprising laterally spaced side members, a top cross-member and a saddle forming a bottom cross-member; said saddle formed with an upper arcuate bearing surface; a vertically reciprocating head mounted on said frame and provided with a punch; a cylindrical work holder provided with a plurality of dies adapted to cooperate with said punch and having its outer cylindrical surface seated and rotatable in said bearing surface; a shaft connected with said holder and passing through an enlarged bore formed in one of the side members, whereby substantially the entire thrust exerted by said punch may be transmitted to the said saddle; and c0nnections between said shaft and holder for effecting their coordination and the cooperation of said punch and dies.

3. In a press of the class described, the combination of a frame including a fixed saddle formed with a cylindrical bearing; a work holder having an exterior cylindrical journal surface engaging said bearing and provided with a central axial bore; a shaft extending through bore in said frame, into said holder and fixed to the latter; the diameter of that part of said shaft which e:: tends through the frame bore being less than that of such bore; a reciprocable head mounted on said frame; and connections between said shaft and holder for reciprocating said head and rotating said holder coordinately.

4. In a press for manufacturing valves and the like, the combination of a vertically reciprocable head, a rotatable work-holder having a horizontal axis and provided with a plurality of circumferentially spaced die recesses; said holder having an exterior journal and being formed with a central axial bore and having radial bores connecting said axial bore and die recesses respectively; a bearing for said journal; a reciprocable ejector in each such radial bore; a spring for each such ejector adapted to urge same radially and inwardly; a fixed arbor mounted in said axial bore and having a cam associated therewith; said cam engaging said ejectors; and means for coordinately reciprocating said head and rotating said holder whereby said ejectors are successively actuated in an outward radial direction.

5. In a machine of the class described, a rotary Work holder, an arcuate bearing cooperating with the exterior thereof for supporting the same, ejectors extending radially from the interior of the holder, and a rotatable cam located interiorly and centrally of the holder for actuating said ejectors.

Signed by us this 24th day of July, 1923.

WILLIAM B. BARTLETT. SYDNEY MARQUIS.

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