US1141677A - Power-press. - Google Patents

Description

E. W. ZEH.

POWER PRESS.

APPLICATION FILED DEC. [7, 19I3. 1,141,677. PatentedJune 1, 1915.

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E. W. ZEH.

POWER PRESS.

APPLICATION FILED DEC. 1-7, I913.

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E. W. ZEH.

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I APPLICATION FILED DEc-|7,1913. 1,141,677, PatentedJune 1, 1915. 4 a SHEETS-SHEET a.

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HE NORRIS PETERS CO.. PHOTO-LITHEL, WASHINGTON. u. .H

. FEFIQE EDMUND W. ZEH, F NEWARK, NEW JERSEY.

POWER-PRESS.

Specification of Letters Patent.

Patented June 1, 1915.

Application filed December 17, 1913. Serial No. 807,327.

To all whom it may concern:

Be it known that I, EDMUND W. ZEH, a citizen of the United States, and a resident of Newark, in the county of Essex and State of New Jersey, have invented certain Improvements in Power-Presses, of which the following is a specification.

This invention relates to that class of power presses in which a head for carrying the upper die is moved up and down by a screw and means for alternately rotating said screw in opposite directions.

The objects of the invention are to secure improved control for the frictional drive; to require the operator to maintain the drive in frictional contact during the downward stroke ofthe hammer; to indicate to the operator when to release the downward drive; to provide means to automatically elevate the hammer when the operator releases the downward drive; to permit adjustability of said indicating means, whereby the operator may release the drive at any desired position of stroke of the hammer; to thus secure adjustability of intensitv of stroke; to automatically stop the hammer at the upper end of its stroke without undue oscillation; to provide an improved form of die for exerting side thrust as well as a downward blow; to obtain an initial downward blow and subsequently another downward blow on the work both during one down-stroke of the hammer; to secure simplicity of construction and operation, and to obtain other advantages and results as may be brought out in the following description.

Referring to the accompanying drawings, in which like numerals of reference indicate the same parts throughout the several views; Figure 1 is a perspective viewof my improved power press in idle position with the hammer up: Fig. 2 is afront view of a portion of the press with parts in section; Fig. 3 is a plan view of the brake and ad jacent portions of the friction disks; Fig. 4 is a central sectional view parallel to the front of the press through the dies; Fig. 5 is a plan of the lower dies, and Fig. 6 is a horizontal sectional View on line AA of Fig. i.

In the specific embodiment of the invention illustrated in said drawings, the ref erence numeral 1 indicates the frame of my improved press, preferably mounted on legs 2 2 to elevate it to a suitable and convenient height. Said frame preferably provides at its bottom above the legs 2, 2 a bed 3 to receive the lower dies hereinafter more fully described, the frame extending upward from the back of said bed, as at 41, so that the bed is thus left accessible from the front and both sides. wardly extending frame portion 1 is preferably centrally open and provides at its front a slideway for a head or hammer e carried upon the lower end of a screw 6 which works through the top 7 of the frame and has at its upper end above the same a horizontal wheel 8 providing at its periphery a friction surface. Said hammer 5 is adapted to carry at its lower end a die 9 subsequently described and adapted to cooperate with the lower dies to form the article to be manufactured. In order to raise and lower the upper die to secure the necessary pressure or impact, the screw 6 is alternately rotated in opposite directions by the following means: Above the friction wheel 8 a horizontal shaft 10 extends diametrically of said wheel, and is journaled in brackets 11, 12 bolted to and projecting upward from the frame 1 or top 7 thereof at opposite sides of the machine. This shaft is provided at one endv outside the bracket 11 with fast and loose pulleys 13 and 1e adapted to receive a driving belt (not shown) and which belt can be moved from one pulley or the other by a belt shifter 15. Between its bearings in the brackets 11, 12 said shaft 10 has fast upon itself driving disks 16 and 17 adapted to alternately engage at their inner facing sides diametrically opposite portions of the frictional rim of the horizontal wheel 8. Obviously, as one or the other of the said drive disks 16, 17 is engaged with the friction wheel 8, said friction wheel will be rotated in one direction or the other, and the screw 6 lowered or raised. To effect such alternate engagement of the drive disks 16, 17 with the friction wheel 8, the shaft 10 is slid longitudinally in its bearings in the brackets 11, 12 by the means next to be described.

Upon the end of the shaft 10 outside of the bracket 12 are two collars 18, 18 made fast by set screws or the like, and between said collars is a sleeve 19 rotatably loose upon the shaft and having trunnions 20 received by the forked end 21 of a lever 22 which is fulcrumed as at 23 upon an arm 24 of the bracket 12 so as to swing in a plane through the shaft 10 and which plane is Furthermore, said up a yoke 28 provided with an annular boss 29 projecting toward the shaft and in axial alinement therewith beyond the end thereof.

and the reduced end 24 of the shaft.

The openend of the cap 25 has a radial outwardly directed flange 30 against which bears a spiral spring 31 encircling the cap and hearing at its other end against the yoke 28 aroundthe annular boss 29 which projects within the convolutions of the spring. By means of the compression of this spring 31, the shaft 10 is normally forced away from the yoke 28 and the drive disk 17 normally held against the friction wheel 8, such engagement rotating the screw 6 to elevate thehammer in operation of the machine.

An oil duct 32 slidably extends through the yoke 28 and is secured to the cap, 25, eccentric to the axial line of said shaft and the boss 29, for admitting oil into the cap within the annular space betweensaid cap thermore, this oil duct prevents the cap from V rotating with the shaft.

In order to secure a blow from the hammer by rotating the friction wheel 8 to drive the screw '6 downward, the operator must manually shift the shaft 10 against the compression of the spring 31 and hold the other drive disk 16 in engagement with the friction wheel, and this is done by the following means. To'the front of the frame 1 above the hammer is fulcrumed, as at 33, a cross horizontally across and connects to the lever 22 below its fulcrum 23 so that a swinging movement given sald lever 22 1s transmltted tothe cross leverand vice-versa, for pur- ,poses hereinafter more fully explained.

r From the end of said cross lever 34 which projects away from the press I hang a stirmp 28, whereas the other end is provided with a vertical hole through which slidably extends a slide-rod 39 secured at its lower end to the hammer as at 40. As the hammer operates up and down, said slide rod 39 slides up and down also, and by means of an. "adjustable dog 41-between the upper end of said slide-rod and thecross lever 34, a downward swingof that end of the lever maybe obtained at any desired'posit'ionof Fur- ' friction wheel.

the hammer on its downstroke. .It'is to be noted that a downward swing thus obtained in the cross lever 34 will transmit its movement through the bell-crank arm 35, connecting link 36 and lever 22 to shift the shaft 10 and remove the drive disk 16 from engagement with the friction wheel and place I the other drive disk 17 in engagement therewith. The operator who has manually held the lever 22 swung against-the compression of the spring, releases his hold on the said lever when the dog on the slide-rod swings it, so that the'hammer will be entirely elevated. Of course if the operator chooses to swing the lever .22 through the agency of the stirrup 38, the action remains the same and he releases his downward pressure on r the stirrup when warned as explained above,

so thatthe friction wheel 8 and hammer 6.

lation of them, Iprovide a brake shown in thedrawings supported upon the shaft 10, i

but not revolving with said shaft. "Preferably such support is by means of a sleeve 42 loose on the shaft 10 and held against longitudinal sliding thereon by avcollar 43 or thelike,las best shown. in Figs. '1 to 3. brake shoe 44 0f wood or any other suitable material is: inserted in or'faces the brake,

and it will be understood that the brake is so placed that as thefriction wheel 8 is rotated andmounts upwardly,the upper sur-,

face ofsaid wheel. 8, preferablyadjacent to the periphery thereof, meets and rims against the said brakeshoe 44 and the wheel is thereby stopped. Preferably the free swinging end of the brake is connected by a link 45 to the horizontalportion 46 of the cross lever 34 between its fulcrum and the end to which the stirrup 38} is applied, as shown, so that asthe friction wheel presses upward against the brake as described, the raising of said brake simultaneously raises the said arm portion 46' and swings the lever to disengage the drive disk 16 from the Saidlinki 45 has its lower end threaded and extending loosely through an appropriate hole in said" cross lever 34, nuts 47,48 onthe threaded rod above and below said lever providing for adjustment of the length of the link. i

The upper die for the press, is shown in Fi gs. 2 and 4, and is affixed to the hammer by the insertion of a stem 49 of a holder 50 in a"suit able socket in the bottom of the a carrier 52 whichin turn is recessed from its bottom to receive the (116 member or ing from the hammer. Said holder is pref} erably cylindrical'and recessed from its bottom upward to provide a slideway siror rad 7 they may slide. The outer end, or end away from the die, of each of these slide plates 62' punch 53. A pin or bolt 54 transverse to the carrier 52 and punch or die member 53 fits in suitable holes in each of said parts to prevent relative displacement, and said pin 51 projects outward from the carrier through a vertical slot 55 in the holder whereby said carrier may slide a limited amount longitudinally of said holder without rotation. It is preferable to make the slideway 51 within the holder of a smaller diameter at its top thanat its bottom, and except for an annular flange 56 at the bottom of the carrier to construct said carrier of a diameter to slide in said smaller art of the slideway. An annular recess 5 is thereby left between the carrier and the holder, terminated at the bottom by said flange 56 on the carrier and at the top by the wall of the holder, and within said re cess 57 I insert a spiral spring 58 of any desired compressive force to normally hold the carrier at the lower end of its range of movement. In this manner, as the hammer is lowered, the upper die first strikes a blow of a force dependent upon the strength of said spring 58, and as the hammer is lowered still further the movement between the carrier and holder is taken up and a second blow occurs. It is of course preferable to proportion the depth of the'slideway 51 to the length of the carrier so that the second blow obtained is with the top of the carrier engaging the top of the slideway 51 in the holder. The lower die 59 to coact with the upper die 9 may be of any suitable construction and is shown in the drawings attached to a base plate 60 which may be secured in proper position on the bed 3. In use with these dies it is preferable to provide for blows to be delivered on the work transverse to the blow delivered by the upper die, and for this purpose I have shown a pair of horizontal dies 61, 61 on opposite sides of the work. These dies are clamped in any desired or well-known manner to slide plates 62, 62 slidable to and from the work in a horizontal plane upon the base plate 60,-

overhanging guides 63 secured to said base plate holding said slides down to the base plate and alsoproviding tracks in which is slotted as at 6% from its outer end inwardly a predetermined distance and the end of said slot is sloped inwardly upward and engages a similarly sloped shoulder 65' of a cam bar 66, extending substantially perpendicular through the slide plate 62 and base plate 60. By depressing said cam bar 66, the shoulder 65 engages the slide plate and shoves it inward toward the work, and for removing the die from the work a sloping shoulder 67 is cut in the opposite side of the cam bar 66 from the shoulder 65 and inclined in substantially the same direc- 66 from the work and adapted to engage the last described cam shoulder 67 when the cam bar is raised and thereby draw the slide plate from the work. For so operating said cam bars 66, the same are preferably made cylindrical at their upper ends and extend slidably through suitable holes in ears 69, 69 extending laterally at either side of the hammer 5, said cylindrical ends being also threaded so as to be clamped in any desired or adjusted position by means of nuts 70, 71 above and below the ears 69.

The cam bars 66 have lower ends 72 beyond the cam shoulders which project downward through apertures 73 in the base 60, said ends 72 preferably bearing against the outer walls of the apertures, as shown in Fig. 4:- This construction insures that when the slide bars 62 are being forced inward toward each other by impact of the cam shoulders 65, the said lower ends 72 of the cam are held by the base 60 against any lateral springing or deflection, and thus great rigidity and positiveness of action is secured.

Having thus described the invention, what I clailn is 1. In a press, the combination of a frame, a screw mounted in said frame, a head on one end of said screw adapted to slide in said frame, a friction wheel on the other end of said screw, drive disks at opposite edges of said friction wheel, a slidable shaft for said drive disks, a cap for the end of said shaft, a spring around said cap tending to slide said shaft to engage one of said drive disks with the friction wheel, and means for sliding the shaft against said tendency of the spring to engage the other drive disk.

2. In a press, the combination of a frame, a screw mounted in said frame, a head on one end of said screw adapted to slide in said frame, a friction wheel on the other end of said screw, drive disks at opposite edges of said friction wheel, a slidable shaft for said drive disks, a cap for the end of said shaft, means for lubricating between said end of the shaft and said cap, a spring around said cap tending to slide said shaft to engage one of said drive disks with the friction wheel, and means for sliding the shaft against said tendency of the spring to one end of said screw adapted to slide in said frame, a friction wheel on the other end of said screw, drive disks at opposite edges of said friction wheel, a slidable shaft for said drive disks, an adjustable yoke fixed transversely of the shaft at a distance from the end thereof and providing a spring bearing,

edges of said friction wheel, a slidable shaft for said drive disks, a spring tending to slide said shaft to engage one ofsaid drive disks with the friction wheel, a brake adapted to engage the friction wheel upon upward V said'hand lever, a treadle connected to one cross-lever, a brake vada-pted'to engage'the' 40 movement thereof, and means connected to said-brake for sliding the shaft against said,

tendency of the spring to engage the other drive disk.

' 5. In a' press, the combination of a frame, a screw mounted in said frame, a head on one end of said screw adapted to slide in said frame, a friction wheel on the other end of said screw, drive disks at opposite edges of said friction wheel, a slidable shaft for said drive disks, a spring tending to slide said shaft to engage one of said drive disks with the friction wheel, a hand lever for retractingv the shaft against said spring, a cross-lever fulcrumed on said frame and having a downwardlyprojecting bell-crank arm, a link connecting said bell-crank arm to arm'of said cross-lever, means on the sliding head for depressing the other end of the friction wheel upon upward movement thereof, and a link connecting said brake to the arm of the cross-lever to which said treadle is connected.

1 6. In a press, the combination of a frame, ascreiv mounted in said frame, a head on one end of said screw adapted to slide in said frame, a friction wheel on the other end of-said screw, drive disks at opposite edges of said friction wheel, a slidable shaft for said drive disks, a spring tending to slide sa d shaft to engage one of said drive disks with the friction wheel, a cross-lever fulcrumed on said frame, a brake and atrea'dle and a hand lever all connected to said crosslever to move therewith, said hand lever adapted to retract the shaft against the said spring, and means on the sliding head for V engaging. the lever to swing it contrary to said treadle'and hand lever. l

7. In a press, the combination of a frame, a screw mounted 1n sa d frame, a head on i one end of said screw adapted to slide in said frame, a friction wheel on the other end of said screw, drive disksat opposite'edges of said frictionwheel, a slidable shaft for said drive disks, a spring tending to slide saidshaft to engage one of said drive disks with the friction wheel, across lever fulcrumed onsaid frame, means connecting said cross lever to the sliding shaft to slide the same against said tendency of the spring, a slide rod on the head working through one arm of the cross lever, and a stop on 'saidslide 7 the sameagainst said tendency of the spring,

a rod hinged to the slidinghead and ex tending slidablythrough one arm of the cross lever, and a stop on said slide rod to engage said arm.

9,. In a press,the combination with ahead and means for reciprocatingthe same, of a holder removably secured to sald head, a

carrier slidably mounted insai'd holder and adapted to receive a die, a spring between said holder and carrier normally holding the former projected from the latter, a

member adapted to receive another die,- and means for operating said member from con-f tinued movement of the head afterthe carrier has-been stopped by engagement of. its die with the work. V r 7 a .10. In. a press, the combination with a head and means for reciprocating the same,

of ,a holder removably' secured to said head. and having a slideway with its inner end reduced in diameter, a carrier slidably fit- V ting said, slideway and having a reduced inner end slidably fitting the said .reducedinner end of the slideway and longer than said reduced end, a spring between said holder and carrier abutting at itsopposite ends thebottomof the large portion of the slideway and full-sized 'portion'of the car'' rier' and normally holding the former pro jected from the latter, a member adapted to receive another die, and means for operating said member from continued movement of the head after the carrier has been stopped by engagement of "its diejwith the work I 111,111.21, press, the scombination of' a reciprocating head adapted to carry an'upper'die, a base with upright bearings, a lower die on said baseysl ide plates-mounted on said base. with slots having/inclined w al ls above said bearingsjon the base, lateral dies on said slide. plates,randcam'barsf on said hea'dqprojecting, through sa' in the slide plates to engage said bearings d'fslots V on the base and reciprocate th'e'slide plates as the head moves. 7

12. In a press, the combination of a reciprocating head adapted to carry an upper die, and base having holes therein, a lower die on said base, slide plates mounted on said base with cam surface thereon above said holes in the base, lateral dies on said slide plates, cam bars on said head projecting through said apertures in the slide plates into the holes in the base and slidably engaging the walls thereof, and means for reciprocating said head.

13. In a press, the combination of a reciprocating head adapted to carry an upper die, a base with upright bearings, a lower die on said base, slide plates mounted on said base with slots having inclined walls above said bearings on the base, lateral dies on said slide plates, cam bars on said head projecting through said slot in the slide plates to engage said bearings on the base and reciprocate the slide plates as the head moves, and means for adjusting said cam bars longitudinally and locking them in desired position with respect to the head.

14:. In a press, the combination of a reciprocating head adapted to carry an upper die, a base, a lower die on said base,

slide plates mounted on said base with slots having inclined walls at their inner ends, sills across said slots providing adjacent said inclined inner ends of the slots other opposite inclines, cam bars on said head projecting through said slots and having each on opposite sides of itself cam shoulders'to engage the said inclines, and means for reciprocating said head, whereby on downstroke the slide plates are moved in one direction and on upstroke they are moved in the other direction.

15. In a press, the combination of a reciprocating head adapted to carry an upper die, a base, a lower die on said base, slide plates mounted on said base and having near their outer ends apertures with 0pposite similarly inclined Walls, cam bars on said head projecting through said apertures and having each on opposite sides of itself cam shoulders to engage said inclined walls, and means for reciprocating said head, whereby on downstroke the slide plates are moved in one direction and on upstroke they are moved in the other direction.

EDMUND W. ZEH.

Witnesses:

HOWARD P. KING, JANET A. AYERS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. G.

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