US2923131A - Hydraulic control apparatus - Google Patents

Hydraulic control apparatus Download PDF

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Publication number
US2923131A
US2923131A US479112A US47911254A US2923131A US 2923131 A US2923131 A US 2923131A US 479112 A US479112 A US 479112A US 47911254 A US47911254 A US 47911254A US 2923131 A US2923131 A US 2923131A
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United States
Prior art keywords
control
piston
setup
liquid
pistons
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US479112A
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Frank J Furman
Hugo A Panissidi
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International Business Machines Corp
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International Business Machines Corp
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Priority to NL99868D priority Critical patent/NL99868C/xx
Priority to NL203251D priority patent/NL203251A/xx
Application filed by International Business Machines Corp filed Critical International Business Machines Corp
Priority to US479112A priority patent/US2923131A/en
Priority to FR1160667D priority patent/FR1160667A/fr
Priority to GB36984/55A priority patent/GB822442A/en
Priority to DEI11123A priority patent/DE1181718B/de
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J23/00—Power drives for actions or mechanisms
    • B41J23/20—Fluid-pressure power drives
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/08—Servomotor systems incorporating electrically operated control means
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L17/00—Apparatus or local circuits for transmitting or receiving codes wherein each character is represented by the same number of equal-length code elements, e.g. Baudot code
    • H04L17/16—Apparatus or circuits at the receiving end
    • H04L17/28—Apparatus or circuits at the receiving end using pneumatic or hydraulic translation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30505—Non-return valves, i.e. check valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50518—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using pressure relief valves

Definitions

  • HYDRAULIC CONTROL APPARATUS Filed Dec. 31. 1954 7 Sheets-Sheet 6 nun I y/M/Am zmim il/ mun mgmlk 2,923,131 v HYDRAULIC CONTROL APPARATUS.
  • the invention relates to hydraulic control systems and apparatus and more particularly to hydraulic control systems and apparatus for quickly adjusting or shifting a controlled element or elements to one of a pluralityof preselected positions.
  • One application of the improved hydraulic control apparatus relates to code rod setup mechanisms or means for wire printers.
  • various means have been proposed to operate code rod units for wire printers which for the most part involve electromechanical arrangements.
  • electrical control pulses are effective to selectively energize certain magnets or the like, which in turn operate to permit positioning of related mechanical links, interposers and the like to actuate or shift an associated code rod to any one of-a predetermined number of positions.
  • the code rod is laterally shifted in any suitable manner to axially shift certain of the aligned wires in each matrix to set up the desired character in a remotely located reciprocatable print head. Reciprocation of the print head results. in printing of the selected character on a suitable paper and such printing action returns the character forming wires to their normal retracted positions.
  • the hydraulic code rod setup mechanism as set forth in this invention utilizes any suitable code rod, lateral actuating mechanism therefor, print head driving means and other necessary control means.
  • This invention is primarily directed to the hydraulic setup means for selectively rotating or axially shifting, or simultaneously doing both, the code rod for a wire printer to one of a predetermined number of positions.
  • This setup mechanism includes a pair of driven or setup pistons for each code rod or character to be printed.
  • One setup piston is directly connected to the code rod to longitudinally or axially shift the same predetermined increments, while the other is connected to the code rodthrough a rack and pinion to selectively rotate the rod about its longitudinal axis.
  • Each setup piston is hydraulically coupled through a liquid column to an independent set of three control pistons which are disposed in individual control piston chambers.
  • Each control piston is mounted in its chamber to provide different displacements or increments of setup piston movement under the selective control of individual control pulse receiving or setup magnets. In one form, this includes magnetically operated valve means.
  • the operation of the setup mechanism is synchronized United States Patent tial starting positions.
  • liquid under pressure is periodically directed to the hydraulic column between the setup and control pistons at some point in the op- 25' erating cycle which adds liquid to the column, if necessary, and thereby compensates for any leakage which may have occurred during the previous cycle.
  • a constant volume of liquid is maintained between the pistons to insure accurate operation.
  • a plurality of setup valves have been provided which have been modified to be directly acted on by a related magnet. These valves are shifted in accordance with operation of the related magnets to transfer liquid under pressure from one side to the other of related control pistons to hydraulically shift the setup pistons the desired increments in a somewhat similar manner. -In still other modifications the setup valves are actuated to permit control piston operation which in turn actuate the setup pistons the desired number of increments.
  • H p I v Fig. 5 is a schematic sectionatview 'or'stinanntfier modification of a hydraulically'operated"setupmechanis'm;
  • Fig.'6 is a schematic sectional view of' 'yjetf an modification of the improved hydraulically operated "setup mechanism.
  • This printingi mechanism includes a suitable number of'wire printer units 12 having an array ofwires 13 arranged'in a-ver- 'ticakro'w and'whose upper ends '14, carried by a re-' -ciprocatable print-head -:1'5, 'face'a suitable platen.
  • This-1 carriage controls the 'movement'of the paper 18 on which the selecteddata' is to beprinted.
  • This printingv mechanismy may be oft-he type shown anddescribed in Frank J. Furman et-al.;, ap-
  • the hydraulically operatedsetup mechanism 10 includes-a body member 19 ,inwhich is housed valve and-piston'mechanisms to be hereinafter described.
  • This-body member may be'disposed within the confines of a suitable liquid retaining sump or reservoir 21 and the lattermay be also adapted to accommodate a liquid pressure generatingmeansin the form of a positive displacement gear pump orthe like 22.
  • the liquid in the reservoir 21 is withdrawn by the pump 22 through a suitable suction connection 23 and is delivered under pressure to a liquid pressure duct or conduit system 24.
  • the system includes a check valve 25, to prevent back flow of pressure should the pump stop, and a liquid pressure relief valve 26 adapted to maintain a substantially constant liquid pressure there- :in.
  • An accumulator 27 may also be connected to the duct system 24 to'compensate for minor pressure fluctuations therein. 7 n
  • a branch conduit 28 in the pressure duct System24 is directed to the pressure port 29 of a cyclically operated spool type setup valve 31.
  • This valve is shifted or reciprocated by means of an eccentric 32 rotated in timed relation with other machine elements and performs one complete revolution for each print or setup cycle.
  • the sp'ool'v'alve '31 is urged to follow the eccentric cam-32 by'means of a suitablecornpression spring 33'associated therewith.
  • a passage of duct 36 extending from the right-hand chamber of the valve 31 is divided and directly communicates With a pair of cylindrical chambers 37 and 38, wherein reciprocatable driven or setup pistons 39 and 41, respectivelygare mounted.
  • the chambers 37 and 38 are formed in ,a housing member 540"s'ecuredto the main body mernb'erd 9.
  • both pistons 39 and 41 are adapted for simultaneous movement in the same direction upon the application of liquid under pressure to the passage 36, assuming the appropriate individual control, means, 42" and 43, respectively, therefor have been previously actuated.
  • the setup" pistons "'39 and”41-” are provided with a re- 1y, each of which hasadb'wer inturnedend 45zr and flda, respectively, I'secu'red adjacent "the central P0111011 of its "related" s'etuf'or driven piston.
  • any'suitable means fordrivingthe print-head 15- may "be provided ⁇ however, a hydraulic mechanismshown in Figs. 1a and-lb is disclosedmAs shown,- a'painof's'ynchromed ecc'e'iitr ics fiP and 62,- provided with-the" proper phase; angle difference, individually operatc related print or control valves 63' and 64 in"a predeterminedmanner to alternatively direct fluid supplied; by thepressure system 24 through suitable conduits 6 and do. to opposite sides of a print piston 67, Fig.
  • This piston is connected to the print head by means of a drive rod and wire assembly 68 to either hold the piston and print piston retracted, as shown, or, to drive the same rapidly forward and perform the printing operation.
  • This cyclic operation is timed in accordance with the'setup means and other timed elements.
  • the above hydraulic drive mechanism is fully describedand claimed in Hugo A. Panissidi Patent 2,800,885, issued July 30, 1957. Since the particular print mechanism forms no part of the invention, a detailed description 'isnot deemed necessary.
  • each setup piston control means 42 an d 43 includes a set 0f three control pistons 71, 72and 73, each of which is- :mounted for reciprocation in related. control chambers 74, 2'75 and 76, respectively.
  • each code rod 48 includes two setup pistons 39 and 41 and two sets ofthree control pistons 71, 72 and 73, which when actuated simultaneously or individually in a predetermined or preselected manner, permit code rod movement to print any one of thirty-five possible characters on' the paper 18, Fig.1b. a
  • each code rod 48 for each ordered position is operated in an identical manner, only one of the print positions therefor will be described. Also, since the control means 42 and 431for' the rotational and the longitudinal movement of the code rod 48 are identical in construction and operation, only the longitudinal setup portion for the code rod setup will be described-in detail. However, it is to be understood that the number of code rods 48. utilized depends upon the number of characters to be printed during a cycle of operation and that separate and independent rotational and longitudinal control means for each code rod is necessary.
  • each control piston 71, 72 and 73 disposed in their separate chambers are each limited in upward travel by means of an adjustable abutment or stop 79.
  • Each of the stops is adjustedto establish different starting or home positions for the assoc ated control pistons to thereby provide different liquid storage capacities in'the lower portions of thechambers.
  • a feature of this control mechanism. is that each control platen is assigned a weighted value in accordance with coded data which is translated into pulses and delivered to any one or any. combination of three setup magnets 80, 81 and 82.
  • magnets and related control pistons may, in this instance, be labeled 1, 2 and 4, as in- ,dicated on each magnet, to provide a modified binary code handling mechanism capable of accepting and :processing any combination of pulses to move the code rod .48 to any one of seven predetermined longitudinal posi- :tions.
  • the ,liquid receiving space or control chamber beneath each ,,..control piston has a different liquid capacity dependent upon the assigned weighted value. That is, the chamber 1 74 below piston 71 stores liquid equal to l increment of .,setup piston movement, chamber 75 stores liquid equal am 2 increments of movement and chamber 76 stores ..;-1..iq id q a to 4 men s 9i magma
  • a valve means in the fo'rm'of ap'oppet type control valve 83 At the lower end of each control chamber is a valve means in the fo'rm'of ap'oppet type control valve 83,
  • each poppet valve having an upw'ardly projecting' guiding stem, normally [urged against'its seat by spring means 84.
  • Each valve normally seals its related'jcha mber.”
  • the Itrapped liquid inthe'associated chamber beneath each individual control piston will be effective to maintain the same against its related stop 79 during the hereinafter described setup operation for theassociated piston- 41.
  • Projecting from the lower endof each poppet valve is a drive rod or wire 85 whose outer end .is secured to the free end of a related armature. 86 forming a part of'the associated control magnet.
  • the liquid supplied to the lower portions of-the control chambers is directed by the setup valve 31, when the spool therein has been shifted to the right by the eccentric 32, through a passage or channel 87. Opening the pressure port 29 in this direction directs high pressure liquid through the passage 87 to-therbottom side of the poppet valves 83 and opens the samelto supply liquid to any of the control chambers which mayhave been drained duriing a previous cycle, as 'will hereinafter be more fully described.
  • the passage 36 leading to the top surface of the setup pistons 39 and 41 is connected to drain at one of the exhaust lands on the setup valve 31 to thereby permit return motion of the 7 opened to drain by the other exhaust land 35.
  • Liquid under pressure is not only continuously supplied to the setup valve 31, but also directed to the pressure port 88 of a supercharging or make-up pilot valve 89.
  • This valve is provided with the usual reciprocatable spool operated by a rotating eccentric 91 to control the supply of liquid to a divided passage or duct 92 terminating at a pair of spacedflsupercharge or make-up check valves 93.
  • Each supercharge check valve is spring biased in opposition to the applied liquid and communicates directly with the related passages forming'the hydraulic columns 77 and 78 between the lower portion of the setup piston chambers 37 and 38, respectively, and the upper surfaces of the associated control pistons.
  • the hydraulic columns parallel connects the upper portionsof the associated control pistons in the same manner as the passage 87 parallel connects the poppet valves 83.
  • the supercharge valve 89 is reciprocated by the cam means 91 in timed relation with the other timed elements.
  • Fig. 3 there isshown a timing chart of the various control or controlled elements which are necessary to properly synchronizethe code rod setup mechanism and printing along with the machine operation.
  • the setup valve 31 has .a motion shown by the curve A and it passes in a cyclic manner from a neutral position to alternatively supply liquid under pressure to the setup pistons 39 and 41 and the poppet valves 83.
  • the second curve B merely indicates the application of liquid under pressure from the setup valve 31 and includes the dotted line C to indicate setup piston motion with respect to time.
  • the timing of the supercharging valve 89 is such that a liquid pressure pulse is directed over the passage 92 and is made available at the hydraulic columns '77 and 78 once for each code rod setup cycle.
  • this liquid pressure pulse causes the appropriate check valve 93 to open shouldany leakage have occurred from the columns'during the previous cycle of operation -and thereby insure a'corlstahtvolume of 'liqui'd in the hydraulic columns 77.. and 78 at all'ti'rnes.
  • the cycle of operation is' such that" the setup pistons 39"and *41' and the control pistons 71,72 and73are-intlicirnormaLor i home positions and that thesupe'rcharge valve '89 has just been actuated tosu'pply liquid under pressure t-hroughit-he passage 92 to the'hydraulic' columns 77 and 7840 insure a constant volumeofliquidtherein.
  • the rotatingecc'e'ntric'fl "automatically cuts 'oif the-supply of liquidand'connects the superchar'ge passage 92 to drain.
  • piston 71 With no back pressure on the control, piston 71,.downward displacement takes place and forces the liquid thereunder into the now low:pressure passage87. This dis- ..placement continues until the piston .71strikes' the upwardly projecting stem on the related open poppet valve which reacts through the drive rod 85 tof knock 01f the armature 86 of-the magnet 80. Such action returns the poppet'valve to itsseat and stops or interrupts further movement of the control. piston 71. As previously mentioned, the liquid capacity under thisparticular control ,i-piston is -weighted tomprovide one increment of control piston-rnovement.
  • the setuppiston4l is moved hy drulically one increment, which isa"'di'stai'1ce”exactly equal to the displaced liquid m the chamber 74' below 'the control piston 71 and is' then 'hydraulically arrested or stopped byithe liquid-'column 78.
  • This translation of the "setup piston longitudinally moves the code rod 48 to a predetermined one increment position. After the above setup of the code "rod takes place, it 4 is laterallynioved against the associated print wires 13 by "the -"cam'55 the liquid therein.
  • the rotational control would be identical. More or less than three' control pistons may be employed. The number used would depend upon the desired piston -movement.
  • Figs. 4a and 4b there'is schematically shown a modlfied control means for both the lateral .and rotational setup pistons 39 and 41 which are adapted to'either laterally shift and/or rotate the code rod 48 in accordance with pulses delivered to the two sets of control magnets 80, 81 and 82.
  • each code rod 48 includes Each setup piston includes scribed.
  • three pairs of oppositely disposed control pistons 96 and 97 aredisposed in each ,increment control section, andcontrol or setup spool .type valves 98, 99 and 100 have been provided therefor, ion'e'for each pair of control pistons.
  • control means for both the longitudinal and the rotation- ',al movement of the code rod 48 are identical in construction and operation, only the longitudinal control Since each set of means, shown in Fig. 4b, will be described.
  • each control valve includes the usual central control land 103 for directing the liquid delivered to the ports 102 and outer spaced lands for controlling fiow through related drain ports which, in
  • each setup valve is connected to a common drain passage 104.
  • the spool of each setup valve is biased to the right, in
  • each control piston 97 is hydraulically connected by means of passages or .ducts 108 to a chamber 109 Y at the right-hand side of the setup piston 41.
  • the champistons 96 are subjected to low pressure, they are maintained shifted to the right against a slide orspacing bar '112 which maintains each pair of opposed'control pistons 96 and 97 in equal spaced relation.
  • the left-hand side of each left-hand control piston 96 is hydraulically parallel connected through a passage 113, which provides a second hydraulic column leading to the left-hand side of the setup piston'41.
  • These control pistons 96 are maintained against the slide bars 112 by the pressure'transmitted through the hydraulic column 113 when the setup piston "41 is moved to'the left.
  • the right-hand check valve 117 is provided with a spring 118 having a lighter loading than that always urged to the left against its stop 44, defining its home position, and acts to hydraulically prevent piston movement to the right should the valve 116 be opened "by the applied pressure to supply make-up liquid to the second column 113.
  • Both driven or setup pistons 39 and 41 are shown in their normal or home positions.
  • Each control piston 96 is provided with an adjustable stop means 119.
  • a bail member 120 is associated with each valve, all ofv which are simultaneously reciprocated in timed sequence: with the normal machine operation in any suitable manner (not shown).
  • setup pistonAl may be movedany number of increments from 1107- by selec- -tively energizing any one or any combination of thethree "control magnets 180, i 81 and '82 and that the lop -tion in each instance would .be identical. The same would also apply to operation of the setupspiston 39.
  • liquid under pressure is supplied to both hydraulic columns 103 and 113, in the previously-described "manner, to
  • Fig. 5 schematically represents still another means-for hydraulically setting up the code rod 48 in-which'the operation of a pair of setup pistons 123 .and .124, mounted in a stationary body member-125, have been .modified slightly and-a slightly different control 'valveian'd: setup piston means have been provided.
  • each piston reactslthrough passages defining "hydraulic columns 127 and .128, eachof whichlis parallel connectedto the .left side of separate groups of .three control pistons 129.
  • Each control piston .129 is apro- -vided with an adjustable abutmentor stop member.131.
  • a 'branch'passage 132 conducts liquid under pressure to parallelconduits leading to the pressure :ports 1340f it-l tC tWO groups of three setup or controlvalves :135, "136- .and 137. Onegroup of valves controls therotational and the other controls longitudinal movement-of .the code rod id/through suitable linkage. Since eachucode rod-48 involves two identicalcontrol portionsvandtvalve control means therefor, only'one will be :described.
  • the setup valves 135, 136 and 137 are each:maintained latched to the right, as shown, by an armature:86 and magnet construction identical to that described in Fig; 4 and includes an identical reciprocatablebailmeans "120. With the control or setup valves shifted and Here again, the positionof :the stops 131 and movement :of the icontrol pistons 129 determines the increment of. movement 'of the :driven or setup piston 12.4. With i-theamechanism as shown,.
  • control pistons 129 are urgediagaihst their .respectivestops .131 by the liquid under pressure jsupplied over the line132.
  • the setup piston 123 will'have moved the desired number of increments to provide the proper positioning .of the .coderod 48 'for the character selected, after which the wire setup and printing operation occur in the usual manner. "The return movement of the bails 120 shifts the released control valves to the right to relatch the same with the related armature 86 and redirect liquid under pressure to the right-hand side ofthe COHtIOI'PlStODS IZQ, which. in turn are displaced to the left against :their. related .stops 131.
  • each lsetufp piston 39 and 41 in turn includes three individual conand 82 includes an armature 148 witha .downturned latch member .149 thereon adapted to engage in a .slot 148:: formed within the periphery of. its.related.control valve and anassociated spring .150 is adapted .to nor- .mally urge-the valveto the left.
  • the left-hand liquid chamber 152 is the left-hand liquid chamber 152.
  • This left-hand chamber in each directly communicates with a conduit or passage 153 hydraulically connected in parallel to similar passages by means of a first liquid passage or channel 154.
  • the passage 154 also parallel connects the chambers 146 for the left-hand control pistons 144 to the left-hand side of the setup piston 41 to provide a first hydraulic column.
  • each pair of oppositely disposed control pistons 144 and 145 are hydraulically urged against a related common eccentric 155.
  • These eccentrics are cash designed to provide for different control piston displacements, however, they are synchronized to rotate in 'unison and in phase so that all control pistons simuleffect short-circuited, through the passage 153, that is, as the eccentrics 155 rotate, liquid is displaced from the control piston chambers at one side to the other Since this represents a net zero displacement, the result-isthat the setup piston 41 is not effected; In addition, the setup piston is maintained in its normal orhome position by the trapped liquid in a second hydraulic column 156 communicating with the chamber 157 at the right side of thesetup piston 41. Thus, during this interval,
  • supercharge or make-up liquid poppet valves 158 and 159 are sequentially cammed open by means of a double lobed cam 160 and liquid under pressure is supplied to both hydraulic columns 154 and 156, to insure a constant volume of liquid in both.
  • the phase angle 'diiference of the lobes on the cam 160 is such as to apply the high pressure liquid pulse to the column 156 prior to the column 154. This insures the return of the setup piston 41 against its stop and acts as a buffer to prevent the piston from taking some intermediate position, should the pulses be applied simultaneously to each column.
  • eccentrics and the like are rotated in synchronism in timed relation to the machine cycle operation in any suitable manner, not shown.
  • control magnets 80, 81 or 82 are energized, during the proper portion of the printing cycle, the related armatures 148 are retracted from engagement with its associated setup valves, which are urged to the left against a related continuously rotating control valve eccentric 161. These eccentrics are rotated in synchronism with the control piston eccentrics 155,
  • a hydraulic control means for accurately positioning a code rod or the like which involves relatively low inertia elements capable of rapid movement to provide the desired increment of movement of the code rod or output member.
  • a hydraulic operating means for a code rod or the like which is supplied with liquid under pressure at some predetermined point in each cycle of operation to maintain constant volumes of liquid in the hydraulic operating means to thereby insure accurate movements of the driven members.
  • the combination'of a driven piston having an initialstarting position and whose limit of movement therefromis to be. selectively controlled to one of a plurality of positions
  • control assembly including control pistons for providing the preselected limits of driven piston travel, .means including a hydraulic column for connecting said control pistons to said driven piston, cyclically operated means for hydraulically shifting said driven piston to .oneof the plurality of positions'and for hydraulically returning the .same to its initial starting position through saidhydraulic column, means for holding said .drivenpiston stationary during cyclical operation of said last-named means, and valve means for periodically supplying liquidunderpressure-to said hydraulic column to maintain a constant vol- ,ume ofliquid between said control and driven pistons.
  • a cyclically operated controlled piston having aninitial starting position and whose limit of'rnove- -ment therefrom is to be selectively controlled toone of a plurality of positions
  • a control assembly for said con trolled piston providing for the preselected limits of controlled piston travel during a cycle of operation
  • said:'control assembly including a plurality of displaceable control 'pistons,*means for providing a hydraulic column between said control pistons and said controlled piston todirectly limit the extent of movement of said controlled piston
  • locking means for maintaining said control pistons inactive during cyclical operations to thereby hold said controlled piston fstationary through :said hydraulic 'i'COlllIlll'l, :means iassociated .with 'said last-named means for selectively activating one or more of said control pistons to permitthe displacementofliquid in said hydraulic column, the displacement of said controlled piston" corresponding to 'the "total displacement of the active control piston
  • cyclic-ally operated means for returning the activatedicontrol pistons and said controlled piston to *their initial starting positions, said locking means being operative with the control pistons to hold said controlled piston through said hydraulic column.
  • a cyclically operated hydraulic setup mechanism for selectively rotating andlongitudinally translating a code rod for a wire printer to one of a plurality of positions, comprising a'pair of drive pistonshaving startingpositions :and operatively connected to saidcode rod for selectively longitudinally translating and rotating the same in accordance with the desired character to be printed during a cyc'lesof operation, an .independentlyidperable .control assembly .for each drive piston-each control as- Lsemblybeing cyclically operable and including a plurality of.'ind ependently .displaceable control pistons 1 defining a group, :a';passage providing aliydraulic column'nbetween each group of control pistons and the associated drivejpiston to provide for simultaneous movement therebetween,
  • locking means associated with each control piston toselectivelyhold said drivepiston during a cyclic operation, means for selectively operating said controlassembly.
  • cyclically operated hydraulic control apparatus 5 .the combination .of a cylinderhaving a driven piston there- .in normally disposed at a starting position, a control pistonhydraulically movable from first to second positions, a passage providing a liquid pressure transfer 001- .umnbetween said driven and control .pistons to provide for simultaneous movement, valvemeans for hydraulically holding said control piston in the. first position, means for selectively conditioning said control piston displacement means for operating said valve means to'permit movement of .said control piston, and cyclically operated valve means operative to alternately supply liquid under pres .sure to.
  • said driven piston to shiftthe sameand .said .con- .trol piston through said liquid pressure transfer column an amount determined :by .the vresultant control ,piston movement to its second position and to return saiddriven piston to its starting position by applying liquid under pressure to said-control piston to return the same to -.first position, .said valve. means being operative afterreturn of said control piston to hold said driven piston stationary during continuous operation of said cyclically operated valve means.
  • control means including a plurality of control pistons each having a starting position, means including a hydraulic ,column-for-conneeting one side of said control pistons to one side .ofsaid drive piston for movement therewithat prese'lected lintervals, independent valve means normally '3 tSfill iQllOld eachcontrol piston in the starting positiorrdnrring cyclic operation of the system, said control pistons :beings operative through.
  • said hydraulic column tohold said drive piston stationary when at their starting positions, means for individually andselectivelyoperating one -.or more independent valve means to condition 'therelated control pistons for operation, cyclically operated means -'for applyingpressure to said drive piston, to move the :same a distance determined by hydraulic movement of the selectively conditioned controlpistons, means for reversing the application .of pressure to return said drive and controlpistons .to their startiugfi positions and means for resetting the selectively operated valverneans to hold :said control .and drive pistonsat the Startingpositions. 8.
  • a'hydraulic controlsystem thezcor'nbinationofa cylinderihaving a drive piston thereinnormally disposed .at astartingposition and movable to one-.of a-preselected .:number of positions, "a plurality of control .pistons each .imounted in an individual control chanrber andhavinga starting position, means'including a hydraulicicolumn for connecting one side of'said control pistonstto T0116 side'of said drive piston for movement therewith at preselected intervals, control valve means'associated' with:eacl'r cham- 'ber, said control valve means, when closed, 'beingeflective to hydraulically hold said driveand control ipistons stationary, means for individually and'selectively opening one ormore of said control valves to permitliquidfiow from the related control chamber, means for applying pressure to said drive piston to displace the-same and the 65 "control pistons through said hydraulic column whosevrelated controlvalves have been opened,
  • a driving piston normally maintained at a starting position Within a chamber and hydraulically movable to any one of a predetermined number of increments, a plurality of control pistons, each disposed in an individual control chamber and adapted to be independently movable therein, means including a hydraulic column for hydraulically parallel connecting one side of said control pistons to one side of said driving piston, individual valve means for each control chamber to trap liquid therein and block control piston movement, means for normally maintaining said valve means closed, means for selectively opening one or more of said valves in accordance with predetermined desired increments of driving piston movement, and means for applying liquid under pressure to the opposite side of said driving piston to displace the same and to hydraulically displace through said hydraulic column the control piston Whose valve means were opened, said displaced control pistons being operative after preselected driving piston travel to engage and close the associated valve and react through said hydraulic column to interrupt further travel of said driving piston, said last-named means being effective after the driving piston travel has been interrupted to apply liquid under pressure to said
  • a setup piston disposed in a chamber at a normal starting position and movable to one of a predetermined number of positions, a plurality of control pistons, a passage providing a liquid column for hydraulically connecting one side of said control pistons to one side of said setup piston,
  • a driving piston having an initial position and whose limit of travel is to be selectively controlled
  • a control piston having a predetermined limit of travel
  • a liquid passage providing a hydraulic transfer column connecting said driving and control pistons for providing simultaneous movement, therebetween
  • valve means for hydraulically holding said control piston stationary during cyclic operating of the system
  • cyclically operated means for applying pressure to said driving piston to displace the same and said controlpiston through said hydraulic col-.
  • control piston movement limiting said driving piston travel
  • said cyclically operated means being further operative through said valve means to apply liquid under pressure to said control piston to return the same and to hydraulically return said driving piston to its initial position, and means for maintaining a constant volume of liquid in said connecting passage;
  • a driving member normally maintained at a starting position and hydraulically shiftable to one of a plurality of positions
  • a control piston having a predetermined limit of travel
  • a passage providing a hydraulic column directly connecting said driving member and control piston for movement in unison
  • control valve means having a normal position for maintaining said control piston in its starting position to hold said driving member stationary
  • means for operating said control valve means to condition said control piston for movement cyclically operated means for applying pressure to one side of said driving member to displace the same an amount equal to the limit of travel of said control piston
  • said cyclically operated means being operative to transfer the application of pressure to said control piston to return thesame and said driving member to their starting positions
  • means for'r'eturning' the operated control valve means to the normal position at the end of each operation and means for periodically supplying liquid under pressure to said hydraulic column to maintain a constant volume of liquid therein.
  • a controlled piston Whose limit of movement is to be controlled, a control piston'assembly having a preselected limit of travel, means for hydraulically connecting said pistons for simultaneous movement, a control Valve for-normally holding said'pistons stationaryduringcyclic operation, means for operating said valve to direct liquid under pressure to said control piston assembly to shift the same'the preselected limit of travel and hydraulically displace said'controlled piston through the hydraulic connection, cyclically operated valve means for hydraulically returning said controlled piston to its starting position by redirecting the application of liquid under pressure to said control piston assembly, means for actuating said control valve to the normal holding position at the end of each cycle of operation, and means'for applying liquid under pressure to said hydraulic connecting'means to maintain a constant volume of liquid ther'ebetween.
  • a'setup piston selectively reciprocated within a chamber between a starting position and one of a plurality of forward positions, a plurality of first and second pairsof reciprocatable control pistons, means for holding each pair of pistons in spaced relation, separate passages providing first and second liquid columns extending from opposite faces of said setup piston to opposite faces of each pair of control pistons, a control valve for each pair of control pistons, means forholding said control valves in the first position to direct liquid under pressure to one of each pair of said control pistons to hydraulically maintain said setup piston in its starting position throughsaid first liquid column, means for operating said control valve to redirect the liquid under pressure to the associated second control piston, said second control piston acting through said second liquid column to hydraulically shift said setup piston an equal number of increments, said setup piston displacing liquid on the opposite side thereof through said first column to the first control piston to compensate for the liquid displacement, and means for returning said control valve to said one position to reapply the liquid under pressure to said first control piston to
  • control means for selectively positioning said driving piston to one of a predetermined number of positions
  • said control means including a plurality of pairs of spaced first and second control pistons, means for limiting the movement of said control pistons, means for hydraulically parallel connecting one side of said first pistons of each pair to one side of said driving piston to provide a first hydraulic column, means for hydraulically parallel connecting one side of said second pistons of each pair to the opposite face of said driving piston to provide a second hydraulic column, a control valve for each pair of control pistons, means for normally holding each of said control valves in one position to direct liquid under pressure to one side of each of said first control pistons to hydraulically hold the same and said driving piston stationary, means for selectively operating one or more of said control valves to redirect the liquid under pressure to said second control pistons of the actuated valves to hydraulically displace the related second control pistons a predetermined number of increments and hydraulically shift
  • a setup piston normally disposed within a chamber at a starting position and reciprocatable therein to one of a plurality of other positions, a source of liquid under pressure, means for continuously supply liquid to one side of said setup piston to urge the same in one direction, a control piston movable a preselected number of increments, a hydraulic column for connecting said control and setup pistons for simultaneous movement, a control valve means for maintaining said control valve in one position to direct liquid under pressure to one side of said control piston in opposition to the pressure supplied to said one side of said setup piston, means for operating said valve to connect said one side of said control piston to drain whereby the liquid under pressure acting on said one side of said setup piston shifts the same and acts through said hydraulic column to shift said control piston the predetermined number of increments, cyclically operated means for returning said control valve to said one position to reapply liquid under pressure to said control piston to return the same, said control piston acting through said column to return said hydraulic setup piston to its starting position, and means for applying high pressure liquid to said
  • a setup piston normally disposed in a chanmber at a starting position and movable therein to one of a plurality of preselected positions, a plurality of pairs of oppositely disposed control pistons each mounted in a control chamber, means defining first and second hydraulic column for hydraulically connecting one side of each pair of said control pistons to opposite sides of said setup piston, control piston cycling means for displacing said pairs of control pistons in synchronism to displace liquid in said control chambers, a control valve associated with each pair of related control chambers, means for reciprocating said control valves in synchronism with said control piston cycling means, latch means for holding said control valves out of engagement with said reciprocating means to provide continuous transfer of liquid between opposite control chambers of related pairs of control pistons, an independently operable magnet for each control valve operative upon energization to release the related control valve to interrupt transfer of liquid between related control chambers, said control piston cycling means being operative through the actuated control pistons to displace liquid through said first
  • said last-named means includes a pair of liquid make up valves, one for each side of said setup piston, and cam means for sequentially opening said make up valves to insure return of the setup piston to the starting position.
  • a driven piston normally disposed within a driven piston chamber at a starting position against a stop and adapted to be hydraulically moved to and held at any one of a predetermined number of positions, a plurality of pairs of opposed control pistons, said opposed control pistons each being disposed in an individual control chamber with each pair of said control pistons being independently displaceable preselected increments, means for reciprocating said pairs of opposed control pistons in synchronism and in the same direction, means for parallel connecting the control chambers of one of each of said pairs of opposed control pistons to one side of said driven piston chamber to provide a first hydraulic column, control valve means for hydraulically connecting the opposed control piston chambers to maintain said driven piston stationary as said opposed control pistons are reeiprocated, means for parallel connecting the other side of said driven piston chamber to said control valve means through a second hydraulic column, means for selectively operating said control valve means to close the hydraulic connection between the control chambers of the actuated control valve means, said first hydraulic column directing the displaced

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Reciprocating Pumps (AREA)
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US479112A 1954-12-31 1954-12-31 Hydraulic control apparatus Expired - Lifetime US2923131A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
NL99868D NL99868C (de) 1954-12-31
NL203251D NL203251A (de) 1954-12-31
US479112A US2923131A (en) 1954-12-31 1954-12-31 Hydraulic control apparatus
FR1160667D FR1160667A (fr) 1954-12-31 1955-12-21 Dispositif de commande hydraulique pour machine d'impression par fils
GB36984/55A GB822442A (en) 1954-12-31 1955-12-23 Hydraulic control apparatus for wire printers or the like
DEI11123A DE1181718B (de) 1954-12-31 1955-12-29 Einstellvorrichtung fuer ein Mittel zur Auswahl der Druckdraehte eines Drahtdruckkopfes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US479112A US2923131A (en) 1954-12-31 1954-12-31 Hydraulic control apparatus

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US2923131A true US2923131A (en) 1960-02-02

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Application Number Title Priority Date Filing Date
US479112A Expired - Lifetime US2923131A (en) 1954-12-31 1954-12-31 Hydraulic control apparatus

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US (1) US2923131A (de)
DE (1) DE1181718B (de)
FR (1) FR1160667A (de)
GB (1) GB822442A (de)
NL (2) NL203251A (de)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3068914A (en) * 1959-11-23 1962-12-18 Paul F Sanborn Sawmill
US3090552A (en) * 1961-07-03 1963-05-21 Ibm Control system
DE1155275B (de) * 1960-10-18 1963-10-03 Creed & Co Ltd Mosaikdrucker fuer elektronische Datenverarbeitungsanlagen
US3106823A (en) * 1960-04-18 1963-10-15 Earl A Thompson Mechanico-hydraulic drive unit
US3115012A (en) * 1961-12-29 1963-12-24 Ibm Fluid control means
US3128696A (en) * 1962-02-05 1964-04-14 Burroughs Corp Type setting means in serial printers
DE1252947B (de) * 1964-04-21 1967-10-26 Siemens Ag Einrichtung zum Abdrucken binaer codiert empfangener Information
DE1263364B (de) * 1964-04-21 1968-03-14 Siemens Ag Einrichtung zum Abdrucken binaer codiert empfangener Information
US3938436A (en) * 1973-04-18 1976-02-17 Hilti Aktiengesellschaft Selective embossing press with drum stop means
US4187762A (en) * 1977-02-14 1980-02-12 Buzby Nicholas L Drive and motion synchronizing apparatus for a hydraulic system
US4392204A (en) * 1980-12-01 1983-07-05 Prim David F Lumber marking system
US8813485B2 (en) 2011-06-21 2014-08-26 Ford Global Technologies, Llc Automatic transmission hydraulic accumulator
US20170234336A1 (en) * 2016-02-16 2017-08-17 Kubota Corporation Hydraulic Block

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US549809A (en) * 1895-11-12 Automatic pickling and washing apparatus
US1714528A (en) * 1926-07-23 1929-05-28 Horace M Staggs Hydraulic long-stroke pump mechanism
US1895732A (en) * 1930-11-18 1933-01-31 Nat Tube Co Pipe welding apparatus
US1934207A (en) * 1929-12-16 1933-11-07 George E Pennock Woodworking machine
US2217783A (en) * 1938-06-09 1940-10-15 F O Schoedinger Operating table
US2240287A (en) * 1940-01-05 1941-04-29 Joseph Sackel Radio apparatus tuning device
US2296864A (en) * 1941-04-09 1942-09-29 Douglas E Morrison Data transmission system
US2361326A (en) * 1942-07-15 1944-10-24 Deere & Co Power lift
US2437821A (en) * 1940-01-29 1948-03-16 Leigh E Hughes Hydraulic pulsator system and make-up means therefor
US2613703A (en) * 1950-06-29 1952-10-14 Harry B Calvert Volumetric hydraulic system for precisely controlling position
US2756038A (en) * 1951-10-31 1956-07-24 Joy Mfg Co Adjustable limit means for mining disintegrating mechanism

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2580788A (en) * 1946-11-06 1952-01-01 Ibm Selective printing and punching mechanism
IT491245A (de) * 1951-11-08 1900-01-01

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US549809A (en) * 1895-11-12 Automatic pickling and washing apparatus
US1714528A (en) * 1926-07-23 1929-05-28 Horace M Staggs Hydraulic long-stroke pump mechanism
US1934207A (en) * 1929-12-16 1933-11-07 George E Pennock Woodworking machine
US1895732A (en) * 1930-11-18 1933-01-31 Nat Tube Co Pipe welding apparatus
US2217783A (en) * 1938-06-09 1940-10-15 F O Schoedinger Operating table
US2240287A (en) * 1940-01-05 1941-04-29 Joseph Sackel Radio apparatus tuning device
US2437821A (en) * 1940-01-29 1948-03-16 Leigh E Hughes Hydraulic pulsator system and make-up means therefor
US2296864A (en) * 1941-04-09 1942-09-29 Douglas E Morrison Data transmission system
US2361326A (en) * 1942-07-15 1944-10-24 Deere & Co Power lift
US2613703A (en) * 1950-06-29 1952-10-14 Harry B Calvert Volumetric hydraulic system for precisely controlling position
US2756038A (en) * 1951-10-31 1956-07-24 Joy Mfg Co Adjustable limit means for mining disintegrating mechanism

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3068914A (en) * 1959-11-23 1962-12-18 Paul F Sanborn Sawmill
US3106823A (en) * 1960-04-18 1963-10-15 Earl A Thompson Mechanico-hydraulic drive unit
DE1155275B (de) * 1960-10-18 1963-10-03 Creed & Co Ltd Mosaikdrucker fuer elektronische Datenverarbeitungsanlagen
US3090552A (en) * 1961-07-03 1963-05-21 Ibm Control system
US3115012A (en) * 1961-12-29 1963-12-24 Ibm Fluid control means
US3128696A (en) * 1962-02-05 1964-04-14 Burroughs Corp Type setting means in serial printers
DE1252947B (de) * 1964-04-21 1967-10-26 Siemens Ag Einrichtung zum Abdrucken binaer codiert empfangener Information
DE1263364B (de) * 1964-04-21 1968-03-14 Siemens Ag Einrichtung zum Abdrucken binaer codiert empfangener Information
US3938436A (en) * 1973-04-18 1976-02-17 Hilti Aktiengesellschaft Selective embossing press with drum stop means
US4187762A (en) * 1977-02-14 1980-02-12 Buzby Nicholas L Drive and motion synchronizing apparatus for a hydraulic system
US4392204A (en) * 1980-12-01 1983-07-05 Prim David F Lumber marking system
US8813485B2 (en) 2011-06-21 2014-08-26 Ford Global Technologies, Llc Automatic transmission hydraulic accumulator
US20170234336A1 (en) * 2016-02-16 2017-08-17 Kubota Corporation Hydraulic Block
US10626891B2 (en) * 2016-02-16 2020-04-21 Kubota Corporation Hydraulic block

Also Published As

Publication number Publication date
GB822442A (en) 1959-10-28
NL99868C (de)
FR1160667A (fr) 1958-07-24
NL203251A (de)
DE1181718B (de) 1964-11-19

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