US2504751A - Turret press - Google Patents

Description

April 19 50 H. STUDLI ,50

TURRET PRESS Filed Aug. 17, 1945 7 Sheets-Sheet l 1 l/wavrqe."

April 18, 1950 STUDL; 2,504,751

' TURRET PRESS Filed Aug. .17, 1945 7 Sheets-Sheet 2 H. STUDLI TURRET PRESS April 18, 1950 7 Shee'ts-Sheet 5 Filed Aug. 17, 1945 H. STUDLI April 18, 1950 TURRET PRESS 7 Sheets-Sheet 4 Filed Aug. 17, 1945 V lwewram AQmaM' I L -11 I FIG. 12

H. STUDLI TURRET PRESS April 18, 1950 7 Sheets-Sheet 5 Filed Aug. 17, 1945 Ila/rimme- H. STUDLI TURRET PRESS April 18, 1950 7 Sheets-Sheet 6 Filed Aug. 17, 1945 H. STUDLI TURRET PRESS '7 Sheets-Sheet 7 F/G. If

April 18, 1950 Filed Aug.

Patented Apr. 18, 1950 TURRET PRESS Hans Studli, Winterthur-Hard, Switzerland Application August 1'7, 1945, Serial No. 611,07

In Switzerland June 26, 1944 Section 1, Public Law 690, August 8, me Patent expires June 26, 1964 10 Claims. (01. 18-20) My present invention relates to improvements in fluid-operated presses particularly for the manufacture of bodies from synthetic resins or plas tics, having a plurality of press-units each provided with a press-cylinder and press-tools or dies and secured to a turn-table structure, the latter being intermittently rotated step by step past a pay-out station for the blanks, a press-fluid tanking station, a press-fluid discharging stationand a delivery station for the final products.

The objects of my improvements are first, to render the press-units independent of any outside pressure-fluid feed by providing a single tanking station to which each press-cylinder in succession is connected at the very moment when a pressing is to take place, such a provision also saving pump power; second, to afford a positive black-feed and pay-out operation; third, to adapt the delivery mechanism for the final products also for stripping threaded products from the dies; and fourth, to control and time all individual movements and operations from a common cam shaft.

I attain these and related objects by the multiple press shown, by way of an example, in a single embodiment of an oil-pressure operated press, in the accompanying drawings, in which:

Fig. 1 is a sectional elevation of the press with one press-unit in the position of delivery of the final product,

Fig. 2 shows partly an elevation and partly a section on the line II-II of Fig. 1,

Fig. 3 a vertical section, in a larger scale, of a press device in the position of delivery of the final product, and of the device for removing the latter,

Fig. 4 a vertical sect on, in a larger scale, of a press device in the pressing position,

Fig. 5 a horizontal section on line V-V through the press devices, and on line V'V, of Fig. 1,

Fig. '6 a top plan view of the blankpay-out device,

Fig. 7 a horizontal section, on line VII-VII of Fig. 9, through the'drive mechanism of the latter device,

Fig. 8 an elevation of the latter,

Fig. 9 a. vertical section of thelatter.

is'raised against the spring 33, until the seats.

Fig. 10 a a t elevation of the drive for the intermittent and stepeby-step rotation of the pressunit turn-table,

Fig. 11 a vertical section, in larger scale, on line X[XI of Fig. 2, of the drive,

Fig. 12 shows, in a larger scale, a vertical section of the press tools, and

Fig. 13 a horizontal section on line XIIL- XIII .bore of the 'extensionf2'9 ,by the stem. 34. air volume in thebore-of the piston extension 29' of Fig. 1, and a, top plan view of the device for.

removing the press products.

A turn-table in the form of a pedestal body comprising a bottom abutment 4, and a composite top abutment 6-! connected to the latter by means of the columns 5, is pivoted, by means of roller bearings 3, on the quill 2 fastly secured to The said top abutment is are securedto the bottom abutment i by their bored axles 29.- Each of said presses comprises a hollow piston 3 (Fig. 4), upon which the press cylinder l0 may be displaced. A cylindrical holder 12 is secured to the latter by means of the $110111?! dered stud II. The matrix or die I3 is exchangeably secured to the said holder 12. A helical spring l4, interposed between the flange 6 and the cylinder head, tends to push the cylinder Ill downward over the piston 9 for the purpose of discharging the press-fluid which, in this case, is oil. The latter is supplied by a pump it continuously driven by the electric motor l5 (Fig. 1). The pressure line l8 (Fig.- 4) and a pipe [9 leading to the pump suction-chamber are disposed in a casing I1, and a valve 20, intermediary of said lines l8l9, is intermittently opened and closed by a cam disc 2| by way of the lever 22 and the rod 23. In Fig. 4 the valve is closed, and the press oil flows through the pipe 24 into the bored pedestal 25, the upper portion of which is acting as a cylinder 25. A hollow piston 27 reciprocates in the latter, and is provided with a valve seat 28 sealing against the valve seat 33 disposed in an extension 29 of the saidpiston, and providing, in accordance with its position in Fig. 4, a connection between the press-oil l ne 24 and the press cylinder Ill. A valve 32, loaded by the spring 3|, is provided in the piston 21, and a helical spring 33, hearing in the pedestal and on the top of the piston 21, tends to draw the latter downwardly. The springs 33 and 3| are so designed that, when press oil enters the pedestal 25, the piston 21 28 and 30 are sealed, upon which the valve 32 is opened and admits oil into the press cylinder l0.

.A check valvev 35 is ton 9-, loaded. by the spring 36-and guided in the The is used for the production and, respectively, the

maintenance of an air pad in the press cylinder portion of its guide stem- 34 projects downwardly housed in the stationary pis beyond the valve seat 30, and the valve may be lifted, for the purpose of discharging the oil from the cylinder l0, by a stationary trip in the form of a roller 3'! whenever the corresponding press-unit is moved thereabove in turning the turn-table 41.

In contrast to: other presses, 'thelpress according to the present invention does not possess a stationary pressure pipe for each of the ten press-- cylinders, but only this charging nozzle common to all of the latter. All pressing devices are'successively charged with pressingoilbyzturning the turn-table 4 step by step above this dispensing ter. each switching step, an axiallyz displaceable tapered dog 41 (Fig. 3) is provided, which-en'- gages the interderital gap 48 in, the plates' 49 fastly secured tangentially to-the abutment 4; The dog 41 (Fig. '3') is controlled in its reciprocating movementby a 'camiil by way of the rigging;lla,:50b and50c.

Ablank pay-out'device (Figs; 6-9) common to' all "pressing devices; i's'provided for, feeding the material "to be. pressed asyflat circular blanks. The said charging device comprises a disk 52 crenellated to form pockets 5l"(Fig. 6') and secured oni'a pin 54 :which is pivoted in a casing adapted as container53. The'latter isin a slantingposition, i..'e. inclined towards'a channel 55 so "that the blanks drop from the pockets 5! into the latter. towardtthe pressing'devi'ces't'o permit the blanks of sliding on into the pressing tools It secured" in. the holder I 2 (Fig. '1)

The disk 52 is moved bya switchgear (Fig. 7 comprising a ratchet wheel '56 and a pawl 57 whichis coupled to'a dog 58 by means of a spring 59. The pawl 5! is fulcrumed in a. swing arm 60 pivoted on the said pin 54'and actuated by way of a link 6! by'means oia lever "62, which latter is operated by the cam disk63. obliquity of the blank'pay-out structure, the said link is provided with, ball-and-socket joints. The speed at which the disk'52' is driven bythe gear 55-57 is at least twice. as great'as required by the number of blanks fed. to the tools, so as to avoid any interruptionoi the feed'notwithstanding the possibility 'thatqsome .of' the pockets 5! be empty. In order, now, to prevent a clogging of the trough 55 by blanks at this, for. a normal feed excessive speed, a cranked feeler'arm 64 is" provided' which projects into the channel 55 with. itsslotted end, on which latter a pin 65 is screwfasten'ed. The said arm is secured to an axie pin 66 journaled in the housing 53 and provided with a lug 6? cooperatingwith the pawl 57. An-

other log 68 is secured to'the swingarm-Bll, and. abuts against the lug 61 when. the said, arm .is rocked ?in the one direction and ithus. swings :the feelerarm '64 into its operative position; When the swing arm 60 swings backin'the other direction, the lugs "'67 and 68 became separated, and the feeler arm 64 is lowered 'for feeling into the channel 55; When meeting a blank, this .is the signal that'a sui-licient numberzof blanks are in the 'channel. and the lug 61 occupies sucha posi- The channel '55 is sloped downward.

Due to. the

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" station.

'ing with pressed products in the 'form of in-- ternally threaded closure caps forbottlgand'like Fig. "1 2 shows such a cap 1'3 in sec- 4 tion that during this swinging back the rearward arm of the pawl 51 hits the lug 61, thereby turning the pawl out of the range of the ratchet wheel 56 so that no clicking takes place upon the forward swing of the arm 60. If the feeler arm 64 does not rest upon a blank, the lug 61 is in such a positionrasnot torengageithe pawl 51, the latter remaining in mesh with the switching teeth of the ratchet. wheel 56 so that the disk 5Z..is.iurther rotated and the trough is further charged with blanks.

To'erisurethat atany one time, only one blank is moving from the trough 55 to the press tools inthe'ir charg'ingpos'ition, a swing lever 39 is providedwhiclion its forward end carries two knives wwand 'll'iopposite one another. In the position occupied by' the swing lever 69 according to Fig.

6, the knife ill has entered into the trough 55 and is in front of the frontmost blank. If blanks have to be fed, the blade H! is withdrawn from the channel and releases"the'frontmost blank to slide cit toward the press tools'. At the same time,-the-b1ad-e H enters into the "trough and prevents the penultimate blank from sliding together with the frontm'ostblank. In the suc ceeding play of'the swing lever 59, the blade it releases the now frontmost'blank, and all blanks in thetrough'slide downward, the irontmost blank being retained'bythe knife ill which iin the meantime has entered into the trough, and the dis pensing cycle starting anew; The-swing lever BE-isdriven'by a cam disk-12*(F-ign2).

A device, common to ail pre'ssum'ts, for-removing the final 'productsis provided at the 'payou-t It isassumed herethat "we are deal containers. tion and the press tools. The latter" comprise the bottom tool I3 which is exchangeabl-y'seeured" in the holder l2 and-defines the-outer form-oi the-- screw cap i3, and the top (1001115 provided with a threaded stud pin hi, which is exchangeabiy" secured in-"the top fiange i of the turn-table m! means of the screw '18.

To remove this press product, it 1 must 198*1121 screwed from'thetoppressing tool"Hi-'---'i5.' This is done by a sleeve 68 pivotedin'arestfl and provided with grippers 1 9 which engagetheinto the inoperative positiomshown 'ina Fig. :13 L'by thedash-and-dot lines. The hub 83 is adjust:- able in elevation in order to bring the rocked sleeve "is up-ward into that position :in: .whichilthe grippers l9 co-act with the pressed article. The,

rest 11 is swung in: and out by the action of e.

cam disc 84 overaswinglevenfidand.arodflfi (Figs. .1-3).. The rest. .1 I. v.raised.. and lowered by the action of a. cam' diskfil over .swingdever J 8t and grooved set collar 'edscrewed iast'. on .the

"hub 83, while the fork 81 raised. and. lowered by "the cam disc acting upon the swing lever 9|, the grooved set collars"! "and the tapp'et H3. The cam-discs and 'levertransmissionsare suitably chosen. so that the lowering movement :is adapted "to' the "thread pitch oithe final "product.

The sleeve I8 is rotated by a motor" over a V-belt drive 959| and gear wheels 98-402, the stationary pinion 98 having such a width of teeth as to ensure the meshing with the' wheel 99 even during the vertical movements lofrthe rest 11. h

The closure cap, unscrewed from the stud I4 of the press tool I5, is still held by the grippers I until the take-ofi device has first beer'r lowered and then swung out into its inoperative position. By depressing the fork 8| or, respectively, by lifting the rear end thereof, the grippers I9 are slacked; the final article is freed fror'fri the grippers and drops into the chute I3.

As described above, all motions required for the stepwise turning of the turn-table with the individual presses, for the actuation of the-blankfeeding device, for the feeding of a pressuremedium to each individual press, and of-the device for removing the final productsand appurtenant motions are actuated by cams "secured to a common cam shaft I03. The drive' for the latter, as shown in Fig. 11, comprises the motor 04, a change-speed drive of the expansion roller type having adjustable cone discs I04, HIS-and V- belts I 06. This change-speed drive is adjusted by means of a handwheel I01 (Fig. 2), a shaft I08, bevel gears I09, spur gears IIO, III and an externally threaded sleeve II2, which latter serves for adjusting the bottom cone disc I0 4--relative to the top disc I05. A worm I I4 is fastlysecured to the shaft H3 of the cone discs I04 and engages a worm wheel H5 secured to-the cam shaft I03.

An excess pressure valve is provided in the pressure line I8 of the pump, comprisinga tapered valve stem H6 and a valve seat H8 loaded by the spring I. A handwheel IIO permits of adjusting the spring pressure and thus the desired-- 9 and cylinder III or from thecheck valve iscaught in the pan I22 provided on the bottom abutment 4, and flows through filters I23 into the sump I20. Oil-losses due to leaks do not impair the function of the individual presses, since, as described above, an air pad is provided in each cylinder I0 which permits of only a gradual pressure drop. In the manufacture of pressed products of, e. g., a synthetic resin, it is sufficient when the maximum pressure is maintained over only a short length of time. The pressure then may gradually drop to zero during the rotation of the press devices from the oil-charging station to the pay-out station of the final product, since no special pressure is required for the condensation of the press product made of a synthetic resin.

The flanges 6 and I of the head structure of the turn-table are electrically heated by means of built-in resistances I24 and I25, and the press tools I5, I6 secured to the flange 1, as well as the lower tool I3 secured on the holder I2 are thus heated by convection and radiation. Thermostats I26 control the temperature of the said flange I, and additional thermostats are provided in the flange 6. Current is supplied to the heating resistances I24 and I25 by the lines I2'I which pass from below through the quill 2, and by the slip rings I28. For the purpose of heat insulation, insulating layers I20 are provided, as well as a 6. bell I30 extending downwardly over the top struc--, ture of the bearing. Said bell is suspended from wires I3I which run over sheaves I32 and are anchored in counterweights I33 to permit of readily lifting same e. g. for the purpose of exchanging the press tools.

Having described the action and operation of the various parts of themachine, a repeated description of the overall operation may be dispensed with. It will be observed that the stepby-step motion of the turn-table and thus of the ten individual presses represented in Fig. 13, is taking place, e. g., in the sense of the arrow shown. One of the said presses being positioned at the delivery station A for the final products, the preceding press is under the pay-out station B for the blanks, the second preceding under the charging station 0 for the pressure-medium, while the next following is on the point D, on which the pressure-medium is discharged by lifting the check valve and where the pressure tools are moving away from each other. In the presses positioned between the points C and D the condensation of the synthetic resin is taking place, if such a material is used for the manufacture of the pressed articles. All of the ten pressing devices pass these points one by one.

In such an individual press more than a pair of pressing tools may be disposed also, and instead of removing the final products by means of the grippers described, they also may be blown off the upper or the lower press tools, provided that they are not threaded. The compre sed-air feed may be controlled by a cam I34 of the cam shaft I03.

Only those features of the machine which are of specific interest for its operation, have been described above. Aside from these, safety devices are provided for, such as electrically operated locking appliances which, e. g., permit of moving theturn-table only when, e. g., the cylinder has reached its lowest position, in order to prevent a collision between the device for removing the pressed products and the lower pressing tools which have not yet been entirely lowered, which might cause damages to the machine.

What I claim and desire to secure by Letters Patent is:

'1. A press of the class described, comprising in combination, a turn-table, a plurality of pressunits each provided with a pressure cylinder reciprocably mounted on said turn-table and with a die fixedly secured to said turn-table, means for intermittently turning said turn-table to bring each press-unit successively into a determined position in which each press-unit starts its operation, a blank pay-out mechanism for dispensing blanks to each press-unit successively, a pump supplying pressure fluid, a pressure dispensing device, coupling means included in said pressure dispensing device and arranged at said operating position for mechanically connecting successively each pressure cylinder with said pressure dispensing device for producing the pressed article, a pressure relief valve in said pressure dispensing device and arranged on the pressure side of said pump, a final-product delivery mechanism including means for removing the pressed articles from the dies of each successive press-unit, and cam means for controlling said pressure relief valve and the means for intermittently turning the said turn-table and the said blank pay-out and final-product delivery mechanism in timed relationship.

2. A press according to claim 1, and in which the pressure dispensingdevice comprises a staa tionary cylinder, a conduit forsupplying pres-- sure fluid toisaid cylinder, a spring-loaded hol loW- piston 'reciprocable in said cylinder and formingpart of said-coupling means for mechana ically connecting the press cylinders of successive superjacent press-units by action-of the fluid pressure, 7 and a spring-loaded 'valve disposed within the said hollow piston and opening only whenthesaid connection has beenestablished.

-31; Anpress according to claim 1, and a hollow piston. provided in the cylinders of each press-:

unit'and secured to and extending downwardly throuehthe said turntable and having a central bore,:a spring-loaded check :valve disposed" within the-said piston, and a valve stem guide extending through the-said bore to project from the lower endthereof and of a length which is "a multiple oftits'diameter, theair volume in'said guide providingandmaintaining an air pad in the said cylinders 'of thepress-unitsat each pressing oporation, and a'stationary dog'disposed below the. turntable for cooperation with'the said check valvestem lifting the latter when a press-unit.

passes over it for the purpose of discharging the press fiuid from the said cylinder.

4. A press as claimed in claim 1, and'in which the s'aid blank-pay-out mechanism comprises a magazine disc supporting-"blanks and inclinedtoward the press-units, a similarly inclined chute for receiving the blanks from said magazine disc, driving means for rotating said magazine disc intermittently, and safety means for interrupting said driving means When said chute is filled with todisengage the pawl from the'ratchet wheel when contacting a blank in the-"said" chute. v

6. A press according to claim 1, and a blankfeed-mechanism having a magazine disc forsu-pporting blanks, an inclined chute for receiving the blanks from the latter and feeding same one by one into passing press-units, and comprising a swing lever having two blades opposite each other andprojecting .into the saidchute, one of sa 7 blades, releasing thelfrontemost blank, in the, said chute upon an outward movement of the saidswing lever while the other blade at thesame time passes in front of the succeeding .blankpand prevents same from sliding ofi into the respective press-unit. I

7. A press as claimed in claim'i; and in which the said blank-pay.-out.mechanismcomprises a magazine disc supporting blanks and inclined, toward the press-units, ,a similarly inclinedchute for receiving the blanks fron said magazinesdiscg driving means for-rotating saidmagazineldiscintermittently, and at least twice as fast as required,

bythe number of blanks necessary for, feeding vthe press-.units so to eliminate any'int'erruption in the blank-feed due to themagazine disc being not fully charged.

8. A press accordingto claim 1,.and;a.,fir;1.ale

product delivery mechanism comprisinga device. for removing the final-productsfrom each press, unit in succession, and controlledfrom the said I. cam shaft, said-device being rockable horizontally-- and 'displaceable vertically.

9. A press according toclaim 1, and a, .final= 'product deliverymechanism having a device .ior

stripping'the threaded 'final product from each press unitin successionand controlled from the. said cam-shaft,- said device being rockable .h0ri--, zontally and displaceable vertically, and com-.1 pri in -agripper rotatably n aging the final. product inrthe manner oia wrench for .the,pur-. pose of unscrewing the productiromrthe diaihe' said vertical displacement being adapted toithe steepness-of the thread pitch on the final product.

10. A press according to claim 1, andin the drive mechanism for the said cam .,shaft includes a chan e-speeda H NS STUDLL REF RENoES CITED The-following references-areof record in the file of this patent:

"UNITlilD STATES PATENTS mater Name. Date ,117,400 Cobb. A, 1,. May ,.1 3 2;;l55,316 Lauterbach Apr. 13, 1939 5i-,Q29. 7 Kin st n P

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