US2573938A

US2573938A - Hydraulic drive for winding machines

Info

Publication number: US2573938A
Application number: US32578A
Authority: US
Inventors: Tyler Ransom; Ewald H Parduhn
Original assignee: Oilgear Co
Current assignee: Oilgear Co
Priority date: 1948-06-12
Filing date: 1948-06-12
Publication date: 1951-11-06
Anticipated expiration: 1968-11-06

Description

Nov. 6, 195] R. TYLER ET AL HYDRAULIC DRIVE FOR WINDING MACHINES 3 Sheets-Sheec l N R H s E U m v m T N M E M w H N w A A R W E 55 6 522355 mv r "I I 4 Q o. u wv m v mm 55w 2253mm we 5 I 3 195 8 $522550 Q. mm 7 m i 8 0 MP mm L v FiledJune 12, 1948 ATTORNEY Nov. 6, 1951 R. TYLER ET AL 2,573,938

HYDRAULIC DRIVE FOR WINDING MACHINES Filed June 12, 1948 3 sheets sheei 2 lOl I I2 00 n3 n4 2 1 V 2 W FIG. 2 30 2| 4 v. 28 3 '00 lol 8 .u |2 n3 n4 7 M 2 2 FIG. 3 /& 3| 2 2s 24 19 I03 7/5 76 ll? 4 7 E FIG. 4 a P 63 62 64 H6 I03 & 7a 75 76 r9 7 72 FIG. 5 4% 1 BI 70 7] INVENTORS RANsoM TYLER EWALD H. PARDUHN ATTOFNEY W us 9 R2 E 52 Nov. 6, 195] R. TYLER ET AL 2,573,938

HYDRAULIC DRIVE FOR WINDING MACHINES,

Filed June 12, 1948 Sheets-Sheet 3 L1 F 6 L2 .100 30 lol I02 1 f o C 3 I03 0 I04 RI R36 8 5 n D Eh/E 0 o o 7 O67 b7 no? R2 START I08 I T j c o w w b R2 S3 w 1 o m s op R4 7 124 O O Y 5 so. 33 I I29 L135 Q .INVENTORS RA'NSOM TYL ER EWALD H. PARDUHN ATTORNEY Patented Nov. 6, 1951 UNITED- .s mr

PATENT OFFICE HYDRAULIC DRIVE FOR WINDING 4 I g MACHINES v Ransom Tyler, Greenfield, and EwaldH. Parduhn,

Milwaukee, Wis a'ssignors' to TheOilgear Com pany,,Milwaukee', Wis -a corporation of Wisconsin Application June-'12, 1948,'Serial No.- 3257:?

This invention relates to hydraulic drives :for" winding machines" and more particularly to a winder drive of'the type employed to drive a winding shaf-t upon which a sheet, strip or strand offlexible material is wound into a rollas' fast as the material is delivered thereto from anothermachine or from another part of the machine ofwliich the windingshaft-forms a part.

A 'winder' drive must maintain tension onthe" material during the winding operatii in a'r idthe tension mustbemaintained within close limits in order'tojprodiice a roll of the desired density: and toflprevenf-tli efmaterial from-wrinkl n orbreakiiigor the-"innerturns of the material'- fi'om movingaxially during" the'winding of other turnsoutward therefrom. p I

The present invention-has as an object to provide a winder drive capable-'of'-maintaining; the correct tension upon'fix'iblen'iaterial While wiiidingthe i'material -into'a rollwhieh has a' very large outside d i am'eter weave to" the diameter otthe eore upon which the material is wound;

Another" object is to provide a winder driveinwl-"iich the tension-onthe material being wound into aroll" may be maintained constant" or may be varied ata predetermined rate l throughout the winding operetiom- 7 Ahotherpb j eat is to providea hydraulie winderdrive wh will m a-"lntain the correot tension e motive liquid by directingia part of the motive liquid through a resistance as is: cus'-- tomary in some of the prior drivesi 'Ahctner'eejecms to provide a winder drive 'be reset to windanother roll. -"Ai-'i0the'r object is to provide awinderdrive: which will maintain a- 'substan-tiallyconstant ten: s-ionupon tlie material being'wouridinto" a roll" until therollis ofsubstantial' di'aineter-andtliereafterto *ma'i-ntain a graduallydecreas'ingtension upoe tlie'materiap p a Other objects and advantages will be apparent from" the description" hereinafter given of" 'awinder-drive irrwhiclithe invention 'iserhbodied The invention is exemplified b the wi'ndr drive shown schematicallyfin the ompanying drawings =i'ri' whiohj tlfe views "are as follows l is a -dia'g1ammati'c view illustrating the Hydraulic circuit of an embodiment f themvention and showing the relation of' the various pace to" each other. 7

Figs. 2 and 3 are viewsshowing a directionalaterial without wastingpowerer heat- 30 after completing?one-rollmay 'quicklwand 5 controlfvaive ni -positions different from those FigS."4: and 5' are views showing another valveinpositions' diiferentfrom those shown in Fig. 1.

Fi 6 is a diagram of an electric circuit which may be employed to control the drive 'shown in' Fig; 7 is a diagrammatic representation of the" relays indicated in Fig. 6.

For the purpose of illustration, the drive: hasbeen' shown as being employed to drive the shaft 5 of a winding machine and cause it to winda strip of paper 2 thereon into' a roll 3"a's fast as the paper is delivered by the deliveryrolls' iof a'calender. Since the windingmachinei the calender andthe paper donot per se term any part ofthe present invention; only parts thereof have been indicatedin the drawing;

The drive includes a' hydraulic transmission for driving the winding machine and a control for starting and stopping the transmission and for causing the drive to maintain a substantially constant tension upon the paper as it iswound into a roll.

The transmission includes arotary hydraulic motor 5'which is adapted to drive shaft 1 throu h a suitable drive 6, a pump 7 which is continuously driven when the drive is in operation and which is adapted to deliver motive liquid to motor 5- switch I3 will open and break the electric circuit in response --to paper 2 breaking aswill presently be explained. Channel I2 has connected therein a check valve l lwhi-ch permits liquid to flow freely'therethrough from motor 5 to valve '8 but prevents liquid from flowing through channel 12 from valve 3 to motor 5: Channel l2 also commun'icates with the inlet ofa resistance valve I5 which'will hereinafter be referred to as a-br'ake valve for the reason'that it resists'thedischa'rge of'liquidfrom motor 5 and therebyimposesa brake load thereon when the drive is being stopped. Valve I5 has its outlet connected 'bya channel |6to a reservoir I! from which pump '1 is suppliedwith liquid. F

Control valve 8 has an axial bore ZFformed in its casing 21 and a valve-member 22 slidably' fitted in bore 26 to control communication between five annular grooves or

ports

23, 24, 25, 26 and 21 which are formed in the wall of bore 26. Channel 9 communicates with port 23 which is arranged intermediate the ends of bore 26. Channels II and i2 communicate, respectively, with

ports

24 and 25 which are arranged at opposite sides of port 23. Channel has several branches and communicates with

ports

26 and 21 which are arranged outward from

ports

24 and 25 respectively. Channel 10 also communicates with bore 26 at points adjacent both ends thereof so that movement of valve member 22 may not be hampered by liquid trapped in the end portions of bore 26.

Valve member 22 is urged to and normally held in its central or neutral position by two

springs

23 and 29, which are arranged in opposite end portions of bore 20, and it is adapted to be moved in one direction or the other by one or the other of two

solenoids

39 and 31 which have been shown as having the armatures thereon connected directly to the stems of valve member 22 but inupractice valve member 22 is shifted in opposite directions selectively by two hydraulic serv-omotors controlled by separate pilot valves which are shifted by solenoids corresponding to

solenoids

30 and 31.

The arrangement is such that, when valve member 22 is in the position shown in Fig. 1, port 23 is open to

ports

24 and 26 and port 25 is blocked so that pump I is bypassed through valve 8 and, if motor 5 is being driven by roll 3, it will besupplied with liquid from valve 6 and it will have to discharge through brake valve [5 which will quickly decelerate it to zero speed.

When valve member 22 is in the position shown in Fig. 2, liquid discharged by pump 1 will flow through channel 9, valve 8, channel ll, motor 5, channel [2, valve 8 and channel ii] to the intake of pump 1, thereby energizing motor 5 which will drive shaft I. When valve member 22 is in the position shown in Fig. 3, the liquid discharged by pump 1 will flow through channel 9 and valve 3 into channel 12 and be employed for resetting the control as will presently be explained. The liquid cannot flow through channel l2 to motor 5 due to check valve [4.

Pump 1, which is continuously driven when the drive is in operation, is of the type which will discharge liquid at a predetermined maximum rate until pump pressure reaches a predetermined maximum and then it will automatically reduce its displacement until it is discharging just enough liquid to maintain that maximum pressure constant, such as the pump shown in Patent No. 2,080,810.

Since such pumps are well known and in extensive commercial use, it is deemed suflicient to state herein that pump 1 is provided with a control 35 which reduces pump displacement in response to pump pressure reaching a given maximum and that control 35 is adjustable to vary the pressure at which it will operate.

Control 35 has been shown as being adjustable by means of a shaft 36 which has been indicated as being a screw for varying the tension of a spring (not shown) which determines the pressure at which the control will operate as such an arrangement is according to the usual practice but the control may be adjusted by other means as it is only necessary that the adjusting element, such as shaft 36, be rotary in order that it may be operated in response to roll 3 increasing in diameter as will presently be explained.

Shaft 36 is connected by suitable gearing such as

gears

31 and 38 to the screw 39 of a limit switch 46 which limits the adjustment of control 35, as will presently be explained, and which has been shown in Fig. 6 as including two alternatively operable switches LS! and LS2. Shaft 36 is also connected by suitable gearing such as two gears 4! and 42 to an adjusting shaft 43 which is connected through an overrunning clutch 44 and a reduction gear 45 to a small pilot motor 46; Reduction gear 45 is also connected through an overrunning clutch 41 to a reset shaft 48 which is connected to adjusting shaft 43 by a suitable drive 49.

Pilot motor 46 is adapted to adjust control 35 in response to roll 3 increasing in diameter. As shown, motor 46 is energized by liquid delivered thereto in response to variations in the volumetric delivery of a small variable displacement zpilot pump relative to the volumetric delivery of a small variable displacement'pilot pump 56. Pump 55 is driven at a speed proportional to the linear speed of paper 2 as by being connected to calender rolls 4 by a suitable drive 51. Pump 56 is driven at a speed proportional to the rotary speed of roll 3 as by being connected to the shaft of motor 5 by a suitable drive 58.

Pilot pumps

55 and 56 are connected in series by'two channels 59 and 66 which form therewith a hydraulic pilot circuit of the closed type. That is, all of the liquid discharged by either pump enters or attempts to enter the other pump. Channel 59 is connected intermediate its ends by a channel 6| to the normal outlet of pilot pump 46 and channel 60 is connected intermediate its ends by a channel 62 to a reversing valve 63 which is connected by a channel 64 to the normal inlet of motor 46.

The pressures created by

pumps

55 and 56 are limited, respectively, by two relief valves 65 and 66 which have been shown connected between

channels

59 and 60 but which in practice are arranged inside the pump casings as is customary.

Valve 63 includes a valve casing 10 having an axial bore 'Il formed therein and a valve member 12 slidably fitted in bore II to control communication between four annular grooves or

ports

13, 14, 15 and 16 which are formed in the wall of bore H. Ports I3 and 14 have

channels

62 and 64 connected thereto respectively. Ports I5 and 16 and the end portions of bore H communicate with branches of an exhaust channel 11 which discharges into reservoir I1.

Valve member 12 is urged to and normally held in its central or neutral position by two springs 18 and 19, which are arranged in opposite end portions of bore H, and it is adapted to be moved in one direction or the other by one or the other of two solenoids and BI which have been shown as having the armatures thereof connected directly to the stems of valve member 72 but in practice valve member 12 is shifted in opposite directions selectively by two hydraulic servomotors controlled by separate pilot valves which are shifted by solenoids corresponding to solenoids 80 and Bi.

The arrangement is such that, when valve member 12 is in its central or neutral position as shown in Fig. 1, port 13 is open to exhaust channel 11 and port 14 is blocked so that if pump 55 is driven by roll 4, it can discharge into reservoir I1 and pump 56 cannot be operated by liquid discharged by pump 55.

When valve member I2 is in the position shown in Fig. 4,

channels

62 and 64 are in communi- 2-,"5mawse to: motor-48 and cause itto adjust -the controlr bynpump=55 in excess of-theliquid which can. enterlpump 56: willfiow fronrchannel 68" through channel-62; valve 63, channel 64, motor 46 i and channel fit. into-return channel 59 and cause:-

-When valvemembei lz'isinthe positionshown 52, motor 46 to rotate adjusting shaft43' through in Fig. 5; port 14-isaopen-to-exhaust channel 11 and port 13 is blockedz-so that-motor lfi may-be:

reve sedt rgse thg qnt cols-ij V v ,o

Reversal of motor" 46 is effected by supplying liquid to channel 84 from pump 1:" As-=shown-,

channel59 is connected by a channel'82 tochainnerll at apointbetween valve sand-check valve M sc that,-- when valve member--22 is shifted tothe position shown in-Fig 3 ,--liquid mayflow frompump l through channel 9gvalve 8-; channels |2,- 82% 59 sna e to 'motor 46 -and causeit to operatein the reverse direction and to discharge liquid through channel 64?, valve-63 andcha-nnel 11-into reservoir l-'|.'- Channel 82 ha's connected therein a flow control valve I 83, which limits the rate at which liquidmay-now frompump- 1-- ,to motor- 46; and a check-valve 84-which permits-liquidto-flow from channel I2- te channel'59 but-pre-- vents the flow-from channel 59 --to channel l-2 The pilotcircuit iskeptflooded with liquid by a' gearpump 85 which in practiceis-- driven in unison with pump 1 andisarranged in the casing thereof as is cu'stomary- -butwhichfor the pur-' pose of illustration has beenshown separate from pumph Gear pump 85= drawsliquid from-reservoir--l Land discharges-it into achannel -88- which is connected to theretur-n side of the pilot circuit as by being connected to channel 82 through a check valve 81- whieh permitsgear pump- 85 tosupply liquid-to the pilot circuit-but prevents flow -from the" pilot circuit. into the gear pump circuit: 7 H V i Liquid discharged by -gear pump 85 ordinarily is -also used-for: control pu-rposesandmay be used to supercharge' pump w-hen motor 5 is driving shaft 'l but-such use has not beenillustrated as it is according to -common practice; Gear pump 85: discharges liquid at a rate---inexcess ofrequirements and theexcessliquid isexhausted into-reservoir 11 through a low pressure relief valve 88 which enables gear pump 85 to maintain a low pressure in the return 4 side ofthe pilot'- circuit; 1

Pump 55 is a well known type which has its displacementivaried by means of -a 'screw 9'5-havinganadjusting knob 96fixedto-the outer end thereof so .that pumpdisplacement may be adjusted-'manually. Pump 56'isthe.same type-as pump 55 and ithas itsadjusting screw 97 connected by a suitable drive 98 to adjusting shaft Maj-so that the displacement of pump 56 is adjusted when shaft 43 rotates.

-Bumps fii'and 56 are initially so adjusted that each will discharge liguid: at exactly the same volumetric rate each time shaft l first starts to wind'paper thereon, that is, when the paper has been attachedito; a; suitable, core on shaft l I and shaft l has rotated justenough .to. pull the slack out of the strip of: paper; between it and the al n er- Y,

Rotation of shaft I will cause paper to accu-n late thereon, and form-, a roll 3 which will gradually increase in diarneter, Since the peripheral speed of roll 3-remains equal to the linear'speed ot paperi 2, therotary speed of shaft l; wil l decrease relative to. therlinear speed of paper 2 in, proportion to' the increase in the diameter of;

roll t thereby causing pump 56-to slow down softhat alli'of thQliquiddischarged by pump sgcaneg nter mnis; 'I' b i idd s hare d creasing pressure.

a speed proportional to the-rate at which roll' reduction gear 45 and clutch 44.

duction-gear-45 to shaftand will permit shaft 48ato be rotatedaidly by 'shaft 43 through drive 49.

Rotaticnof shaft 43 causes drive: 98 to turn adjustingscrew 91 to increase-the displacement oflpu'mp 56; Since pump 55 is driven at a speed proportional to the linear speed of paper2= and pump 56- is driven at a speed proportional to thetrotaryspeedof. shaft 1 which gradually de-' creases relativeto the-speedof paper 2 as roll 3=increases in-diameter, and since motor 481s 20genergi'zed'solely by'liq-uid discharged' by pump 55: in excessof the"liquid-which can enter pump;

56; the displacement of pump 56=willbe increased at a-rrate'proportional to the rate at which roll 3 increases in diameter, thereby causing the 255; speed of shaft 43-tobe maintained at a rate prop'ortional to the rate at which roll 3'increase's in diameter.

giveni-tension onpaper -2 in order to produce a roll 3 of the desired-density.- Pump control 35* is. .initially-soadjusted" that, as soon as motor 5 has: exerted the desired tension upon paper 2,

itlwilllcause pump- '1 to reduce its displacement} until'it is delive'ring just enough liquid to enable" motor 5 'to wind up paper? as fast as it isde livered lay-roll 4 and to sionon paper 2; p

As roll -3 gradually increases in diameter, motor 5-: must drive shaft l at a graduallydecreasing speed and it must exert a gradually increasing torquecin order to maintain the desired tension upon paper 2, thereby requiring pump 1 to gradually decrease-its displacement and to gradually increase the pressure of theliquid deliveredto motor 5:'

However, gradual-rotation of adjusting-shaft 43' causes-gears 42 and 41 to gradually turn shaft 36 which-will adjust control 35 to requireing v pump I -to deliver liquidto motor 5 at a gradually decreasing rate and at a gradually in- Since shaft 43' is rotated at 3 increases in-diameter as explained above, the reduction in pump displacement and the increase in pump pressure will'be proportional to the rate at which r0113 increases in diameter.

Consequently, theitorquezof motor 5 will increase at .therate at'which roll 3 increases in diameter so that motor 5::awill maintain a, constant tension on paperZ.

The drive maybe. controlled'manually suchj as-by shifting the valves manually or shiftingthe valves as by means of the solenoids controlled by individual manually operated" switches but preferably the drive is controlled by an electric circuit such as that'shown in Fig. 6.

As shown, solenoid 38 is controlled by a relay- RI, solenoid Bil-is controlled by arelay R2 and arelay R3,"solen0ids --3l and 8| are controlled by a re1ay-R4,- relay R'I- is controlled by relay" RZgand a starting switch-S1, relaylRl' is con-- maintain the desired tentrolled-by pressure switch I3;:relay R3 is .con-.

Electric current for energizing the solenoids and the magnets of the relays is supplied thereto from two power lines LI and L2 which :are connected to opposite sides of an electric'power circuit through a suitablejswitch not shown.

The "winding of solenoid 30 is connected :to line LI by a wire IBE and it isconnectable to line L2 through a wire IGI, relay contact RI and a wire I02; connected to-line LI by a wire I03 and it is con.- nectableito line L2 through a wire:-IM,- relay contact R2 'a wire I85, relay contact R3 and a wire I06. The magnet RI of relay RI' is connected to line LI and it is connectable to line L2 through a wire Hl'i, starting switch SI and a wire I08 and it is also connectable to line L2 through a wireIUEl, relay contact RI, a wire IIIL'relay contact-R2, a wire II, stop switch S3and awire II2.'

. The -winding 'of solenoid 3| is connected to" line LI; by a wire H3 and it is connectable to line L2 through a wire H4, relay contact R4, a -wire II5, wire III, stop switohS3 and wire 2. The windingof solenoid 8| is connected to line -Ll by a wire H6 and it is connected to wire IN by a wire III so that solenoids 3| and 8| are operated in unison.

'The magnet R2 of relay R2 is connected to line LI and it is connectableto wire II through a wire II8, pressure switch I3 and a wire H9. The magnet R3 of relay R3 is connected to line LI and it is connectable to wire II5 through a wire I20, switch LS2 of limit switch 40 and,

a wire I2I and also through a wire I22, relay contact R3 and a wire I23. The magnet R I of relay R4 is connected to line LI and it is connectable to wire Il5 through a wire I24, .reset switch S2 and a wire I25 and also through a wire I26, relay contact R4 and a wire I21, switch LSI of limit switch 49, and a wire I28.

It is desirable that the operator be notified when pump control 35 has been adjusted to a predetermined limit. This may be accomplished by causing relay R3 to effect operation of a signal such as a lamp I29. As shown, a transformer. I3Il has the ends of its primary winding connected to lines LI and L2 by two wires I3I and I32 and one end of its secondary winding connectable to the other end thereof through a wire I33, relay contact RS a wire I34, lamp I29 and a wire I35 so that lamp I29 will be lighted when relay R3 is operated.

Operation Assuming that main pump I and gear pump 85 are running, that the end of the strip of paper 2 hasbeen fastened to a suitable core fixed on winding shaft I, that pilot pumps 55 and 58 have been so adjusted that they will discharge liquid at the same volumetric rate when the drive is started and that pump control 35 has been so adjusted that pump I will create just enough pressure'to' enable motor 5 to exert just enough torque to exert the proper tension upon paper 2 when the drive is started, the drive will operate as follows:

With the parts in the positions shown in Fig. 1 pum I will be at full stroke'and' will circulate liquid idly'through valve 8, and gear pump 85 will discharge through relief valve 88 and will The winding of solenoid 80 is maintain aulow pressurein the pilot circuit butthat pressure cannot cause pilot motor'fifito operate becausechannel 64 is blocked at valve-63; 1": i

The drive 'may be startedby closing start-' 1 ing :switchfSI whichjwill; -establishfla circuit (LIfiRI +I0I--SI;I08;L2) to cause relay RI;

l will flow through channel-9, valve 8 and channel I I to motor 5 and cause it to rotate shaftl and the liquid discharged by -motor -5 will flow through channel l2, valve-8 and channel I0 to the intake of; pump 1.

Since at this time theload on motor 5 as light and pump I is at full stroke, motor 5' would accelerate very rapidly if switch SI were held closed'and, if there were considerable slack in the-strip of paper 2 between shaft I and rolls 4, motor 5 would gain so much momentum before the slack was pulled out that the strip would be broken-when it became taut. Therefore, motor 5 should be inched until all slack is pulled out of the paper. That is, switch S I- should be closed,

and opened repeatedly and held closed only momentarily so that motor 5 cannot accelerate to a speed high enough to cause the paper'to break when it-becomes taut. If the paper is pulled taut before being fastened to the core on shaft I, inching would be unnecessary. 1

Pilot pump 56 will be driven a limited amount by motor 5-during the inching process but the liquid discharged by pump 56 cannot cause pilot motor 46 to rotate as channel 64 is blocked at valve 63. The limited amount of liquid discharged by pump 56 at this time is bypassed through relief valve 66 to the intake of pump 56.

Until the paperbecomes taut, relay RI will open and deenergize solenoid 30 to permit valve member 22- to return to neutral each time starting switch SI opens because a holding circuit for relay RI cannot be established until pressure switch I3 closes. However, when switch SI is closed after the paper becomes taut, a circuit will be established through magnet RI and solenoid 30 valve member 22 will be shifted to direct liquid from pump I to motor 5, as explained above, and motor 5 will 'tryto wind paper 2 upon shaft I which will cause pump :pressure to rise. When pump pressure reaches a givenvalue, pressure switch I3 will close and establish a circuit to hold relay RI closed when starting switch SI is released, thereby maintaining the previously established 'circuit'througlf solenoid 30 which'w'ill hold valve member 22 in the position shownirl Fig. 2.

Relay R2 will also establish a circuit deliver liquid through channel 9, valve 8, channels i2, 82, 53 and 6! to pilot motor at which will be operated in a direction opposite to that in which it operated when adjusting the controls and it will discharge liquid through channel E i, valve 63 and channel ll into reservoir ll.

The displacement of motor 46 is only a small fraction of the full displacement of pump 1 and, if motor 46 were operated by the full volumetric delivery of pump 1', .it would be driven at such a high speed that it would soon be destroyed. However, flow control valve 83 limits the flow to motor 46 to a rate which will cause motor 46 to operate at a safe high speed and the resistance of valve 83 causes pump pressure to rise sufiiciently to enable control 35 to adjust pump 1 until it is delivering liquid at the rate determined by valve 33.

Motor 46 will drive reset shafts 48 at high speed through overrunning clutch 41 but it cannot drive adjusting shaft 43 due to overrunning clutch 44. Shaft 48 will rotate shaft 43 through drive 49 at high speed in the reverse direction, that is, in a direction opposite to that in which it rotates when adjusting pump controls 35 and 91. Screw 36 will be rotated in the reverse direction by shaft 43 through gears 42 and 41, screw 39 of limit switch 40 will be rotated in the reverse direction by screw 36 through

gears

31 and 38, and pump adjusting member 91 of pump 55 will be rotated in the reverse direction by shaft 43 through drive 93 at such high speeds that the controls will be reset in a very short time such as four or five seconds.

When the controls are adjusted to their initial positions, switch LSI of limit switch 40 will open and deenergize the magnet R4 of relay R4 which will cause switches R4 and R4 to open. Switch R4 will provide a second gap in the holding circuit of relay R4 so that it cannot be reestablished until both of switches R4 and LS! are closed. Switch R4 will break the circuit through solenoids 3i and BI which will thu be deenergized and

permit valve members

22 and 12 to return to their neutral positions so that pump 1 will be bypassed and the drive brought to rest with the parts thereof in positions to start another cycle of operations when starting switch SI is closed as explained above.

The winder drive illustrated and described herein may be modified in various wayswithout departing from the scope of the invention which is hereby claimed as follows:

1. In a hydraulic drive for rotating a winding shaft on which flexible material is wound into a roll as fast as said material is delivered by a machine, the combination of a main hydraulic motor connected to said shaft to rotate the same, a main pump for supplying motive .liquid to said motor to enable it to drive said shaft, said main pump having a control which in response to the pressure created by said pump rising to a given value will automatically reduce the displacement of said pump until said pump is delivering just enough liquid to maintain the pump pressure at that value and which includes an element for adjusting said control to vary the pressure required to eifect operation of said control, a first pilot pump driven at a speed proportional to the linear speed of said material, a second pilot pump driven at a speed proportional to the rotary speed of said roll of material so that the speed of said second pilot pump decreases relative to the speed of said first pilot pump as said roll increases in diameter, said second pilot pump having a said mainpump and -12 member rotatable to vary its displacement, a hydraulic pilot motor adapted to be operated by liquid delivered thereto in response to variations in the relative speeds offsaidpilot pumps; and driving means connecting said pilot motor to said adjusting element and'to said displacement-varying member to enable said pilot motor to'adjust said second pilot pump simultaneously. 5

2. A hydraulic drive according to claim 1 and including means operable inresponse to breakage of said material for preventing fiowof liquid from saidmain pump to said main motor.

3. A hydraulic drive according to claim land including a brake valve connected to the outlet of said main motor, and means operable in response to breakage of said material for preventing how of liquid from said main pump to'said main motor and for preventing discharge of liquid from said main motor except through said brake valve. v

i. A hydraulic drive according to claim 1 and including a'direction control valve connected between said main" pump and said main motor, a brake valve connected to the outlet of said main motor, said control valve including a valve member shiftable to two positionsin the first of which it directs liquid from said main pump to said main motor and from said motor to said pump and in the second of which it bypassessaid pump and blocks communication between said pump and the outlet of said motor to thereby cause any liquid discharged by said motor to be exhausted through said brake valve, means for shifting said valve member to its first position to thereby efiect operation of said main motor, and means responsive to pump pressure dropping below a predetermined value for causing said valve member to be shifted to its second position to thereby stop said main motor.

5. A hydraulic drive according to claim 1 and including means responsive to said main pump control being adjusted to a. predetermined maximum pressure to effect operation of said means for preventing further operation of said pilot motor.

6. A hydraulic drive according to claim 1 and including a valve for controlling said pilot motor and shiftable to two positions in one of which it permits liquid to flow through said'pilot motor and in the second of which it blocks flow through said pilot motor, means including a solenoid for shifting said valve, and an electric circuit for energizing and controlling said solenoid including a limit switch operable in response to said main pump control being adjusted to require a predetermined maximum pressure to effect operation thereof.

'7. A hydraulic drive according to claim 1 and including a first valve for controlling said main motor, a first solenoid for adjusting said first valve to' direct liquid from said main pump to said main motor, a second valve for controlling said pilot motor, a second solenoid for adjusting said second valve to permit liquid to flow through said pilot motor, and an electric circuit for con-' trolling said solenoids and including a manual switch for effecting operation of said first solenoid, and a switch responsive to said main pump creating a given pressure for keeping said first solenoid operated and for effecting operation of said second solenoid.

8. A hydraulic drive according to claim 1 and including a first valve for controlling said main motor, a first solenoid for adjusting said first operation thereof.

fval-ve to direct liquid -froin enema-messiah said 'inai-n 'motor; a secondvalve" U H r-controll-ing d pilot motor, a second solenoid for adjusting second valveto permit liquidj'to fiow through switch adapted when operated "to-cause said first solenoid to *be en rgized, a switchresponsi-ve to id main "pump creating a predetermined presincluding a limit switch operable in response to "said main pump control being adjusted to require pilot m otor, and an lectric-circiii-t for con- "trol 'ng said solenoids an'd' including a manual pilot i ndtor to cause the same to operate in the oppos'itedirection a d "thereby 'reset the co itrols of-said mampum and saidseoond-piiot=pump l2. 'A hydrau-li'c drive accordingjto claimf and including a onection control "valve connected between *said 1 am pump said -main motor "and" also connected "to said pilot motor; a brake a predetermined "maximum pressure to "e'ffect lo 9. In a hydraulic drive for rotating awiriding shaft on which flexible material i wound 'fin'to -=a=ro11=as fast as said material 'is deliveredby "a main pump for supplying motive liquidto "said required'to-efiectoperation of said control, a first pilotpump driven at a speed proportional to the linear speed of said material a second pilot pump driven at a speed proportional to-the rotary speed of said roll :of :material so that the speed of said second pilot pump decreases relative .to the speed of said firstpilot-rpump assaid-roll increases in diameter, said second pilot pump'having a member ro tatable to vary its displacement, fiuidch'a'nneis fconh'ectingsaid pilot pumps in series with '-"e'abh other and forming therewith a pilot circuit, 7

a pilot motor having its inlet and outlet connected to opposite sides of said circuit so that it is operated in a given direction by liquid discharged by said first pilot pump in excess of the liquid that can enter said second pilot pump, and driving means connecting said pilot motor to said element and to said member to enable said pilot motor to adjust the controls ofsaid main pump and said second pilot pump in response to said roll increasing in diameter.

10. A hydraulic drive according to claim 9 and including a direction control valve connected between said main pump and said main motor, and a brake valve connected to the outlet of said main motor, said control valve including a valve member shiftable to two positions in one of which it directs liquid from said main pump to said main motor and from said motor to said pump and in another of which it bypasses said pump and blocks communication between said pump and the outlet of said motor to thereby cause any liquid discharged by said motor to be exhausted through said brake valve.

11. A hydraulic drive according to claim 9 and including a direction control valve connected between said main pump and said main motor and also connected to said pilot motor, and a check valve connected between said control valve and the outlet of said motor, said control valve including a valve member shiftable to two positions in one of which it directs liquid from said main pump to said main motor and from said motor to said pump and in another of which it directs liquid from said main pump to said "valve' connected" to the outlet of 'sa'iid ma otor, anda check valve-connected between:s 11 control sure'for keepirrg said first solenoid energized{and "valve'and-the connection o'f' -said brake vave wan {for causing said second solenoid to '-be energized, "and means for deenergizing=saidsecond '-'so1eno'id the outlet of said main motorfsaid-controlvalve including *aWa-l-ve *meniber shiftable to' th-ree posi- "ti'cns in {one at which it directs liquid from -s'aid "to thereby cause any li'quid discharged by 's'a'id motor to' be exhausted through said brake'valve machine, th combination of ama'in hydraulic go finotor 'con'ne'ctedto said shaft to rotate "the-same,

andin the third of which ittiirects liquid from 's'aidjma'in pump to said pilot motor to cause the same to "operate in the opposite direct-ionnrid thereby reset the controls of said main'p'uni'p an'd said'seeon'd'pilotpump; r 7

f1 3. *A hydraulic drive according'to' claim' Q'and including a"reversi ng valve connected b'etween one'pmt of said pilot motor andone s e cr am pilotcircuit;saidreversing-valve inclu'd l valve member shiftable totwopositionsin oneof which it "connects isaifd one port to said i one *side or said pilot circuit and in the other 'oif' whi'ch itblocks said one port andconnectssa'id one side oi said pilot L-ircuittO eiihaust. y

Q14. A 'iiydraulic'driveaccording to claim sand including 'a direction "contrdl "Valve connected "between said m'ain *pujm'p and' said mam motor and also connected -*to--said pilot" circuit; said connoi valve including a valve member shii teibl'e to two positions in one of which it directs liqiiid from said mainpumjpto said ma'in'fmdt r'a d 'f rcrn sa id motor to said um an'd in another' of ill which it directs liquid from said main pump to said pilot circuit, and a reversing valve connected between one port of said pilot motor and one side of said pilot circuit, said reversing valve including a valve member shiftable to two positions in one of which it connects said one port to said one side of said pilot circuit and in another of which it connects said one port to exhaust and blocks communication between said one side of said pilot circuit and exhaust.

15. A hydraulic drive according to claim 9 and including a direction control valve connected between said main pump and said main motor and also connected to said pilot circuit, said control valve including a valve member shiftable to two positions in one of which it directs liquid from said main pump to said main motor and from said motor to said pump and in another of which it directs liquid from said main pump to said pilot circuit, and a reversing valve connected between one port of said pilot motor and one side of said pilot circuit, said reversing valve including a valve member shiftable to three positions in one of which it connects said one port to said one side of said pilot circuit, in another of which it connects said one port to exhaust and blocks communication between said one side of said pilot circuit and exhaust and in the third of which it blocks said one port and connects said one side of said pilot circuit to exhaust.

16. A hydraulic drive according to claim 9 and. including a control valve having a member shiftable to either of two positions for directing liquid from said main pump to said main motor or to said pilot motor, a reversing valve connected to said pilot motor and including a valve member shiftable to different positions to control the flow of liquid through said pilot motor, means for shifting said control valve member to a position to cause said main pump to deliver liquid to said pilot motor, and means for shifting said'reversing valve member to a position to cause said liquid to operate said pilot motor in the reverse direction and thereby cause said pilot motor to reset said controls.

1'7. A hydraulic drive according to claim 9 and including a control valve having a member shiftable to either of two positions for directing liquid from said main pump to said main motor or to said pilot motor, a reversing valve connected to saidpilot motor and including a valve member shiftable to different positions to control the flow of liquid through said pilot motor, means for shifting said control valve member to a position to cause said main pump to deliver liquid to said pilot motor, means for shifting said reversing valve member to a position to cause said liquid to operate said pilot motor in the reverse direction and thereby cause said pilot motor to reset said controls, and means responsive to said main pump control being reset to its initial position for shifting said valve members to positions to discontinue delivery of liquid from said main pump to said pilot motor and stop further operation of said pilot motor in said reverse direction.

18. A hydraulic drive according to claim'1 and .therethrough, means for adjusting said: control valve to cause said main pump to deliver liquid to said pilot :motor, and means for adjusting said reversing valve to cause said liquid to operate said pilot motor in the reverse direction and thereby cause said pilot motor to reset said controls', said drivingzmeans including a reduction gear driven by said pilot motor, an adjusting shaft adapted to be driven from said reduction gear and connected to said main pump control including a signal for indicating when the pres- --sure created by said main pump has reached a predetermined maximum, and means responsive to said main pump control being adjusted to said predetermined maximum pressure to effect operation of said means for efiecting operation of said signal. a

19. A hydraulic drive according to claim 1 and including a signal for indicating when the presadjusting element and to said pilot pump adjusting member, a reset shaft adapted to be driven by said reduction gear and connected to said adjusting shaft, and overrunning clutches connected between said reduction gear and. said shafts to permit said adjusting shaft to'be driven directly from said reduction gear or to be driven by said reset shaft. 1

7 RANSOM TYLER.

EWALD H. PARDUHN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date a 2,082,473 Tyler June 1, 1937 2,164,600

Tyler July 4,1933