US2351264A - Power transmission - Google Patents

Power transmission Download PDF

Info

Publication number
US2351264A
US2351264A US357896A US35789640A US2351264A US 2351264 A US2351264 A US 2351264A US 357896 A US357896 A US 357896A US 35789640 A US35789640 A US 35789640A US 2351264 A US2351264 A US 2351264A
Authority
US
United States
Prior art keywords
reel
strip
pressure
section
driving section
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US357896A
Inventor
Ferris T Harrington
Robinson James
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vickers Inc
Original Assignee
Vickers Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Vickers Inc filed Critical Vickers Inc
Priority to US357896A priority Critical patent/US2351264A/en
Application granted granted Critical
Publication of US2351264A publication Critical patent/US2351264A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
    • B21C47/003—Regulation of tension or speed; Braking
    • 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
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • 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
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/20507—Type of prime mover
    • F15B2211/20515—Electric motor
    • 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
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20538—Type of pump constant capacity
    • 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
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20546—Type of pump variable capacity
    • F15B2211/20553—Type of pump variable capacity with pilot circuit, e.g. for controlling a swash plate
    • 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
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20569—Type of pump capable of working as pump and motor
    • 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
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/20576—Systems with pumps with multiple pumps
    • 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
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/21—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge
    • F15B2211/214—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being hydrotransformers
    • 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
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/25—Pressure control functions
    • 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
    • F15B2211/30—Directional control
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/321—Directional control characterised by the type of actuation mechanically
    • F15B2211/324—Directional control characterised by the type of actuation mechanically manually, e.g. by using a lever or pedal
    • 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
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/329—Directional control characterised by the type of actuation actuated by fluid pressure
    • 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
    • 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
    • F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
    • F15B2211/5151—Pressure control characterised by the connections of the pressure control means in the circuit being connected to a pressure source and a 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
    • F15B2211/55—Pressure control for limiting a pressure up to a maximum pressure, e.g. by using a pressure relief 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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/635—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements
    • F15B2211/6355—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements having valve means
    • 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
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F15B2211/7053—Double-acting output members
    • 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
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7058—Rotary output members
    • 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
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/75—Control of speed of the output member
    • 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
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/76—Control of force or torque of the output member
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S60/00—Power plants
    • Y10S60/905—Winding and reeling

Definitions

  • This invention relates to power transmissions
  • the problem of driving the reel so as to maintain constant linear speed or constant tension in the strip as it is wound or unwound from the reel presents certain dimculties due to the necessity of varying both the torque on the reel shaft and the speed of the reel shaft as the diameter of the reel changes.
  • Figure 1 is a diagrammatic view of a hydraulic power transmission system incorporating a pre-l ferred form of the present invention.
  • Figure 2 is a fragmentary sectional view of part of the mechanism shown in Figure 1.
  • a sectional machine for operating on continuous strip material is there illustrated, and, by way of example, comprises a roller leveler Ill which constitutes a driving section.
  • the details of the roller leveler form no part of the present invention, it being understood that many other ymechanisms'for operating on strip stock and at the same time moving it longitudinally from right to left could equally well form the driving section of the machine.
  • a supply reel is indicated at ⁇ il. comprising a coil of strip I4 which, as disclosed, is partly unwound so that a fiat section of strip I6 extends through the driving section i0 to a take-up reel Il where the strip is again reeled into a coil 20.
  • the roller leveler i0 has a'drive shaft 22 which motor 28.
  • the latter may be of the variable'dis'- placement type provided with a manual control wheel 28 for adjusting the displacement to conseen that the power required to drive the take-upk 40 tr01 the Speed of the leveler l0.
  • a further object is to provide a power transmission of this character wherein'the reels may be operated at different values of tensionin the
  • a double set of pumps 30 and 32 driven by an electric motor 34 and withdrawing oil from a tank 36 through suc- 5 tion conduits 38 and 40- and delivering the same through delivery conduits 40 and 42.
  • 'I'he latter include check valves 46 and 48 through which uid is delivered to a single supply conduit 50 vhaving the customary relief valve 52 therein for bypassing oil to the tank through a conduit 54 whenever the pressure in delivery line 50 exceeds a predetermined value.
  • the supply conduit 50 extends to a port 56 of a manually-controlled stop-go valve 58, the ports strip while still transferring whatever power is 55 60, 62 and 64 of which are connected to the tank vice regulates.
  • the regulator disclosed comprises a block
  • the latter has a stem 202 to which is connected the swinging yoke of thepump or motor unit to which the regulator is attached.
  • 'I'he piston 200 is biased tothe right by a relatively light spring 204 the tension of which, however, does not determine the pressure to which the de- A limit stop 206 is adjustably mounted by means of a threaded stem 208 in an end cap 2
  • 2 is also carried by the stem 208.
  • the limit stop 206 serves to determine the minimum displacement position in the regulator
  • 4 is formed near the lefthand end of cylinder bore
  • 98 is in restricted communication with the interior of the pump casing through a passage 220., It is also in communication with the discharge port of a relief valve 222 through 'a passage 224.
  • the relief valve 222 operates similarly to that disclosed in the patent to Harry F, Vickers, No. 2,043,453, and is pilot controlled by means of a small pilot relief valve 228 which exhausts to tank 36 through a passage 228 leading to the groove 2 I4 and passage 2
  • of relief vvalve 222 connect respectively with the conduit
  • 34 are all drained to the tank by a drainage network 232.
  • the parts are shown in idle position with ⁇ the drive section circuit bypassed but with the reel coupling circuit in condition for operation whenever the driving section I0 is started.
  • the delivery of pumps 30 and 32 is bypassed to tank, as previously described, so long as electricmotor 34 operates, while the delivery of pumps 12 and II6 is bypassed to tank through their respective relief valves 18 and
  • valve 58 When it is desired to start the entire apparatus the valve 58 may be shifted to the right toconnect ports 68 and 66- thus causing motor 26 to wound from coil I4 due to the gradual decrease in the diameter thereof.
  • 34 since unit
  • Hydraulic horsepower being the product oi' rate unit 'I2C must operate at constant horsepower because unit
  • a driving section having means for ensaging the strip and moving it longitudinally, power means for driving the driving section at a controlled speed, a supply reel section from which the. strip is unreeled by the pull'of the driving section, and ⁇ means for controlling-'the tension of the strip between said sections comprising a variable displacement pump mechanically coupled to the reel section in predetermined speed ratio.
  • a ehydraulic motor mechanically coupled to the driving seciion in predetermined speed ratio, a series hydraulic I circuit connecting the pump to deliver all its iiuid outputto the motor, and means responsive to an increase in pressure in said circuit for reducing the pump displacement to maintain said tions in operating' conditions'atthe'pressure regulators
  • a sectional' machine for operating on ⁇ strip material the' combination of a driving section having means for engaging the strip and moving it longitudinally, power means for driving the driving section at a controlled speed, a supply reel section from which the strip is unreeledI by the pull of the driving section, and means for controlling the tension of the strip vbetween said sections comprising a variable displacement pump mechanically coupled' to the :reel section in predetermined speed ratio, a nxed displacement hydraulic motor mechanically. coupled to. the
  • a driving section having means for engaging the strip and moving it longitudinally, power means for driving the driving section at a controlled speed, a supply reel section from which the strip is unreeled from a progressively decreasing diameter by the pull of the driving section, and means for'controlling the tension of' the strip between said sections com prising a variable speed ratio hydraulic power transmission system connected to be driven by the supply reel section and to drive the driving section, and means responsive to operating pressure in said transmission for controlling the speed ratio of said transmission.
  • a driving section having means for engaging the strip and moving it longitudinally, power means for driving the driving section at a controlled speed.
  • a supply reel section from which the strip is unreeled from a progressively decreasing diameter by the pull of the driving section, and means for controlling the tension of the strip between said sections comprising a variable speed ratio hydraulic power transmission system -connected to be driven by the supply reel section and to drive the driving section and comprising a pair of iluid pressure energy translating devices, one of which is of the variable displacement type, and pressure responsive means for regulating the displacement of said one device.
  • a driving section having means 'for engaging the strip and moving it longitudinally, power means for driving the driving section at a controlled speed, a supply reel section from which the strip is unreeled by the pull of the driving section, a take-up reel section onto which the strip is reeled after leaving the driving section, and means for controlling the tension of the strip between said three sections comprising a variable displacement pump unit coupled to the supply reel section and having means for controlling its displacement to mtaintain a substantially constant delivery pressure, a variable displacement motor unit coupled with the take-up reel section and having means 'for controlling its displacement to maintain a substantially constant inlet pressure, and means mechanically coupled with the driving section and hydraulically connected with said units for metering the quantity of uid passing through each of said variable displacement units in predetermined ratio to the longitudinal movement 'of the strip through the driving section.
  • a driving section having means for engaging the strip and moving it longitudinally, power means for driving the driving secizlon at a controlled speed, a supply reel section from which the strip is unreeled by the pull of the driving section, a take-up reel section onto which the strip is ⁇ reeled after leaving the driving section, and means for controlling the ⁇ tension of the strip between said three sections comprising a variable displacement pump unit coupled to the supply reel section and having means for controlling its displacement to maintain a substantially constant delivery pressure, a variable displacement motor unit coupled with ⁇ the take-up reel section and having means for controlling its displacement to maintain a sub- 'f units being adjustable to regulate to diierent pressures whereby the strip tension on one side of the driving section may be varied relative to that on the other side thereof.
  • a sectional machine for operating on strip material the combination of a driving section having means for engaging the strip and moving it longitudinally, power means for driving the driving section at a controlled speed, a driving section having means for engaging the strip and moving it longitudinally, power means for driving the driving section at a controlled speed, a driving section having means for engaging the strip and moving it longitudinally, power means for driving the driving section at a controlled speed, a driving section having means for engaging the strip and moving it longitudinally, power means for driving the driving section at a controlled speed, a driving section having means for engaging the strip and moving it longitudinally, power means for driving the driving section at a controlled speed, a driving section having means for engaging the strip and moving it longitudinally, power means for driving the driving section at a controlled speed, a driving section having means for engaging the strip and moving it longitudinally, power means for driving the driving section at a controlled speed, a driving section having means for engaging the strip and moving it longitudinally, power means for driving the driving section at a controlled speed, a driving section having means for engaging the
  • variable displacement pump unit coupled to the supply reel section and having means for controlling its displacement to maintain -a substantially constant delivery pressure
  • variable displacement motor unit coupled with the take-up reel section and having means for controlling its displacement to maintain a-substantially constant linlet pressure
  • a driving section having means for engaging the strip and moving it strip material the combination of a Ydriving sec- A tain a substantially constant delivery pressure, a
  • variable displacement motor unit coupled with the take-up reel section and having means for controlling its displacement to maintain a substantially constant inlet pressure, and means includ'- ing a xed displacement fluid pressure energy translating device mechanically coupled with the driving section and hydraulically connected in a series circuit with both said units for metering the quantity of fluid passing through each of said .variable displacement units in predetermined ratio to the longitudinal movement of the strip through the'driving section.
  • a strip material handling device comprising y l a supply reel from which the strip is to be unwound and a take-up reel onto which the same strip is to be wound, a pair of constantA pressure, variable volume, hydraulic displacement devices, one connected in driving relation to each reel, a
  • a sectional machine for operating on tion having means for engaging the strip and moving it longitudinally, power means for driving the driving section at a controlled speed, a supply reel ⁇ section from which the strip is unreeled by the pull of the driving section, a take-up reel section onto which the strip is reeled after leaving the driving section, and means for controlling the tension of the strip between said three sections comprising a variable displacement pump unit coupled to the supplyl reel section and having means for controlling its displacement to maintain a substantially constant delivery pressure, a variable displacement motor unit coupled with the take-up reel section land having means for controlling its displacement to maintain a substantially constant inlet pressure, means mechanically coupled with the driving section and hydraulically connected with said units for metering the quantity of fluid passing through'eachA of said variable displacement units in predetermined ratio to the longitudinal movement of the 6 y strikthoushizhcdrivinizsection..niimennlin#A cludingi.vulveselectivelyshiiiumbletociismm-v nectone

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)

Description

June 13, 1944.
F. T. HARRINGTON ET 11u.l
POWER TRANSMISSION Filed Sept. 23. 1940 FIG ' INVENTORS FERRIS w m m T .A
Patented June 13, 1944 UNITED STATES PATENT OFFICE POWER TRANSMISSION Ferris T. Harrington and James Robinson, De-
troit, Mich., assignors to Vickers Incorporated, Detroit, Mich., a corporation of Michigan Appueenep september 23, 1940, serial Ne. 351,396
41.1 Claims.
This invention relates to power transmissions,
particularly to those of the type comprising two availableat the supply reel to operate the takel up reel.
It is also an object of the present invention to provide an improved means for absorbing power generated at the supply reel independently of whether the strip material to be treated is later rewound on a reel or is utilized in the flat condition.
versely 'varying torque and speed is involved.
vWhere strip material is wound in a coil, one
layer on top of another, the problem of driving the reel so as to maintain constant linear speed or constant tension in the strip as it is wound or unwound from the reel presents certain dimculties due to the necessity of varying both the torque on the reel shaft and the speed of the reel shaft as the diameter of the reel changes.
In the handling of strip material as. for example, 'sheet metal, paper, cloth, and similar materials, it is frequently desirableto feed the strip into a treating machine of one sort or anotherv from a supply reel and to again rewind the same strip into a coil by a take-up reel located at the output side of the treating machine. In such machines as heretofore constructed the apparatus provided for driving the take-up reel and the supply reel have been constructed as separate drives entirely independent of one another. In any drive of this character the take-up reel requires positive work to be performed on it while the supply reel performs work as the strip material is unwound from the coil; If the tension in the strip as it leaves the supply reel and as it approaches the take-up reel is the same and if the reel core diameters are the same, it will be Further objects and advantages of the present invention will be apparent from the following de scription, reference being had to the accompanying drawing wherein a preferred form of the present invention is clearly shown.
In the drawing:
Figure 1 is a diagrammatic view of a hydraulic power transmission system incorporating a pre-l ferred form of the present invention.
Figure 2 is a fragmentary sectional view of part of the mechanism shown in Figure 1.
A sectional machine for operating on continuous strip material is there illustrated, and, by way of example, comprises a roller leveler Ill which constitutes a driving section. The details of the roller leveler form no part of the present invention, it being understood that many other ymechanisms'for operating on strip stock and at the same time moving it longitudinally from right to left could equally well form the driving section of the machine. l
A supply reel is indicated at `il. comprising a coil of strip I4 which, as disclosed, is partly unwound so that a fiat section of strip I6 extends through the driving section i0 to a take-up reel Il where the strip is again reeled into a coil 20. The roller leveler i0 has a'drive shaft 22 which motor 28. The latter may be of the variable'dis'- placement type provided with a manual control wheel 28 for adjusting the displacement to conseen that the power required to drive the take-upk 40 tr01 the Speed of the leveler l0.
reel is substantially the same as the amount of power generated by the supply reel neglecting losses. v V- It is an object of the present invention to/rovide an improved hydraulic power transmission system wherein the drive at the take-up reel is so connected with the power absorbing means at the supply reel as to transfer this energy eiliciently fromone reel to the other with provisions for supplying any additional energy required to make up losses.
A further object is to provide a power transmission of this character wherein'the reels may be operated at different values of tensionin the For the purpose of supplying fluid to operate the motor 26 there is provided a double set of pumps 30 and 32 driven by an electric motor 34 and withdrawing oil from a tank 36 through suc- 5 tion conduits 38 and 40- and delivering the same through delivery conduits 40 and 42. 'I'he latter include check valves 46 and 48 through which uid is delivered to a single supply conduit 50 vhaving the customary relief valve 52 therein for bypassing oil to the tank through a conduit 54 whenever the pressure in delivery line 50 exceeds a predetermined value. i
The supply conduit 50 extends to a port 56 of a manually-controlled stop-go valve 58, the ports strip while still transferring whatever power is 55 60, 62 and 64 of which are connected to the tank vice regulates.
|18 and conduit |38 and thus provides pressure relief protection to the output side of unit |34 whenever valve |42 is in the center position; For the purpose of initially filling the system with oil, a conduit |86 having a check valve |88 Vconnectsbetween conduit |58 and conduit |32.
Referring now to Figure 2, there is illustrated a pressure regulator particularly adapted for use with 'the present invention although it will be understood that other types of pressure regulators may be used at |28 and |50. The regulator disclosed comprises a block |96 having a cylinder bore 98 formed therein in which is slidable a piston 200. The latter has a stem 202 to which is connected the swinging yoke of thepump or motor unit to which the regulator is attached. 'I'he piston 200 is biased tothe right by a relatively light spring 204 the tension of which, however, does not determine the pressure to which the de- A limit stop 206 is adjustably mounted by means of a threaded stem 208 in an end cap 2|0 which closes the lefthand end of cylinder bore |98. A springguide pin 2|2 is also carried by the stem 208. The limit stop 206 serves to determine the minimum displacement position in the regulator |28 and the maximum displacement position in the regulator |50. A circumferential grove 2|4 is formed near the lefthand end of cylinder bore |98 to intersect a passage 2|6 communicating with the interior of the casing of the pump or motor unit. This groove is blocked oi by the piston 200 as the latter approaches the lefthand end of its stroke sothat thereafter communication between the pump casing and the lefthand end of cylinder bore |98 is through needle valve ZIB, thus cushioning the movement of piston 200 at the lefthand end of its stroke. The righthand end of cylinder bore' |98 is in restricted communication with the interior of the pump casing through a passage 220., It is also in communication with the discharge port of a relief valve 222 through 'a passage 224. The relief valve 222 operates similarly to that disclosed in the patent to Harry F, Vickers, No. 2,043,453, and is pilot controlled by means of a small pilot relief valve 228 which exhausts to tank 36 through a passage 228 leading to the groove 2 I4 and passage 2|6. 'I'he pressure at which valve 222 opens is governed by the spring adjustment of valve 226'. The pressure connections 230 and 23| of relief vvalve 222 connect respectively with the conduit |32 leading from pump |26 or with conduit |44 leading to motor |46. The interiors of the casings of the three units |26, |46, and |34 are all drained to the tank by a drainage network 232.
In operation, the parts are shown in idle position with` the drive section circuit bypassed but with the reel coupling circuit in condition for operation whenever the driving section I0 is started. During idle position the delivery of pumps 30 and 32 is bypassed to tank, as previously described, so long as electricmotor 34 operates, while the delivery of pumps 12 and II6 is bypassed to tank through their respective relief valves 18 and |22.
y When it is desired to start the entire apparatus the valve 58 may be shifted to the right toconnect ports 68 and 66- thus causing motor 26 to wound from coil I4 due to the gradual decrease in the diameter thereof.
Unit |34 is also driven at a xed speed determined by the speed of driving section I0, and
` since unit |34 is of xed displacement, it controls Y the rate at which'uid can pass from pump orifice 220, the piston 200 is under a constant tendency to move to the right and increase the stroke of pump |26. `The instant that such stroke tends to increase beyond the value necessary to supply the quantity which' unit |34 takes, the
y pressure in conduit |32 will immediately build up and open relief valve 222 thus admitting oil to the righthand end of cylinder |98 at a fasterrate than it can escape through the orifice 220. Ac-
cordingly, the piston 200 will be moved back to the left, thus decreasing the stroke of pump |26 and counteracting the tendency for the-pressure in conduit |32 to rise.
In actual operation the parts will come to a steady condition in whichthe relief `valve 222 is cracked open sumciently to pass oil into cylinder |98 at a slightly higher rate Athan it passes out of cylinder |98 through orice 220. Thus the piston 200 will move to the left slowly at a speed proportional to the gradual decrease in diameter of coil I4. In this manner the volumetric delivery rate of pump ,|26 is maintained constant I during the gradually increasing speed thereof.
The oil discharged from unit |34 iiows through conduit |38, ports |40 and |43 and conduit |44 to the inlet of uid motor |46. The quantity flowing through this path is also constant due to the constant speed of displacement of unit |34. Accordingly, pressure regulator |50 will act to increase the stroke of motor |46 as is necessary to decrease the speed of reel I8 as the diameter of coil 20 increases. The speed of reel I8 can never exceed that where the linear speed of the strip is equal to the linear speed of the strip through driving section I0 since to do so would "stretch, and eventually-rupture, the strip. Accordingly, any tendency for motor |46 to drive the' reel faster than this speed causes an increase in pressure in line |44 which.reacts on the pressure regulator |50 to increase the stroke of motor |46 and thereby decrease the speed of reel I8 restoring the original condition.
In actual operation the piston 200 and pressure regulator |50 will also move slowly -to the left to gradually swing yoke |48 at a speed proportional to the gradual increase in diameter of coil 20. Oil discharged from motor |46 returns directly to the inlet of pump |26. This path is through conduit |52, ports |54 and |56, conduit |58 anci check valve |60. I
It will be noted that under these conditions of operation the speed of the reels I2 and I8 is controlied automatically in such a way that a constant tension isv maintained in the strip between the reels and the driving unit l0. This value of tension moreoveris not necessarily the same at the right and lefthand sides of the driving section |0. 4Ihe operation o f a reel at constant strip tension or constant linear speed requires constant horsepower operation at the reel shaft. This is .4 a Y I vvvevident from the fact that'the torque Aon lthe reel driving section lo by the imit in shalt, being the product lof striptension and coil diameter. varies directly with the diameter of the coil, while the angular speed-being the quotient of strip speed and coil diameter. varies inversely with :t'hecoil diameter. -Since the horsepower at .the shait` is' the product of torque and speed, Athe factor of reel diameter disappears asta factor aifecting horsepower. Ac-
cordingly, since the constant ytension reel produces (at the supply reel) vor requires (at the vtake-up reel) a constant horsepower, it follows that any hydraulic drive which requires or produces constant horsepower will automatically and inherently cause constant tension operation at the reel, assuming, of course, that the drive provides both variable speed and variable torque.
Hydraulic horsepower being the product oi' rate unit 'I2C must operate at constant horsepower because unit |24 maintains a constant rate of ow through unit |25. while the regulator |28 maintains a constant pressure of operation. Likewise at motor |46 a constant horsepower is always produced because of the constantl rate of now determined by unit |34 and the constant operating pressure determined by regulator |50.
It should be noted, however; that |46 unless both pressure regulators are set .to operate at`the same pressure. lWhen they are thus set, equal tension will be maintained in the a motor.
lDuringsettingupopex'atio'ns'itisnecessaryto be able to turn the reel i2 without operating the v reel coupling circuit, and for this 'purpose the control valve ||l may be shifted to direct pilot Also 'it is occasionally desirable to reverse the rotation of the reel Il for attaching the end of a new strip, and forthis= purpose'valve |42 may be shiftedto its extreme right-hand position t0 re- -verse the direction of -iiow through motor |48.
While the form of embodiment of the invention as herein disclosed constitutes a preferred form,
A it is to be understood that other forms might be Vof 4ilow and operating pressure, fit follows thatl the horsee power at unit I2( is not identical to that at unit strip on both sides o the drive section il, and v the unit m win-operate et zero pressure dinerential, thus neither absorbing nor giving out power `from.,or to the driving section I0. 'I'he only function which the unit |34 4performs under' 'these conditions is a sort of synchronizing function to -prevent hunting causedby momentary uctua adopted, all coming within the scope of the claims which follow.
What is claimed is'as follows:
1. In a sectional machine for operating on strip material the combination o f a driving section having means for ensaging the strip and moving it longitudinally, power means for driving the driving section at a controlled speed, a supply reel section from which the. strip is unreeled by the pull'of the driving section, and` means for controlling-'the tension of the strip between said sections comprising a variable displacement pump mechanically coupled to the reel section in predetermined speed ratio. a ehydraulic motor mechanically coupled to the driving seciion in predetermined speed ratio, a series hydraulic I circuit connecting the pump to deliver all its iiuid outputto the motor, and means responsive to an increase in pressure in said circuit for reducing the pump displacement to maintain said tions in operating' conditions'atthe'pressure regulators |28 and IM.
If the pressure regulator |2l is set for a liigherpressure than 'pressure regulator lit, Ithen the power produced at reel i2 in excessiof'that required at reel 'il is returned to the driving unit It by unit ,|34 acting as a motor operating at the pressure diiferential between unit'l28` and-|50.
-Conversely, should the reel- I2 produce less power than required to operate reel l2 at a given adjustment of the pressure regulators, 'the unit |34 will make upthe deficiency by transferring power from driving unit III to the reel I3. It isunder-` f stood, of course, that the above discussion has neglected losses in thehydraulic circuit and invv the mechanical parts of the reel as well as the hysteresis losses in the bending of the sheet material.
Undercertain conditions of operation it is sometimes desired to operate the strip handling device without recoiling the material after it has lllto ports |56 an'd |50 where it ilows to the conduit |58. It will be seen that under vthese conditions the entire quantity of power generated at the reel l2, neglecting losses. is returned to the pressure substantially constant. i..
2. Inra sectional' machine for operating on `strip material the' combination of a driving section having means for engaging the strip and moving it longitudinally, power means for driving the driving section at a controlled speed, a supply reel section from which the strip is unreeledI by the pull of the driving section, and means for controlling the tension of the strip vbetween said sections comprising a variable displacement pump mechanically coupled' to the :reel section in predetermined speed ratio, a nxed displacement hydraulic motor mechanically. coupled to. the
driving section in predetermined speed ratio, a series hydraulic circuit connecting the pump to deliver all its iiuid output'to the motor, and
means responsive to an increase in pressure in said circuit for reducing the pump displacement to maintain said pressure substantially constant.
3. In a sectional-machine for'operating on stripmaterial the combination of a driving section having means for engaging the strip and moving it longitudinally, power means for driving the driving section at a controlled speed, a supply reel section from which the strip is unreeled from a progressively decreasing diameter by the pull of the driving section, and means for'controlling the tension of' the strip between said sections com prising a variable speed ratio hydraulic power transmission system connected to be driven by the supply reel section and to drive the driving section, and means responsive to operating pressure in said transmission for controlling the speed ratio of said transmission.
4. In a scctionalmachine for operating on strip material the combination of a driving section having means for engaging the strip and moving it longitudinally, power means for driving the driving section at a controlled speed. a supply reel section from which the strip is unreeled from a progressively decreasing diameter by the pull of the driving section, and means for controlling the tension of the strip between said sections comprising a variable speed ratio hydraulic power transmission system -connected to be driven by the supply reel section and to drive the driving section and comprising a pair of iluid pressure energy translating devices, one of which is of the variable displacement type, and pressure responsive means for regulating the displacement of said one device.
5. In a sectional machine for operating on strip material the combination of a driving section having means 'for engaging the strip and moving it longitudinally, power means for driving the driving section at a controlled speed, a supply reel section from which the strip is unreeled by the pull of the driving section, a take-up reel section onto which the strip is reeled after leaving the driving section, and means for controlling the tension of the strip between said three sections comprising a variable displacement pump unit coupled to the supply reel section and having means for controlling its displacement to mtaintain a substantially constant delivery pressure, a variable displacement motor unit coupled with the take-up reel section and having means 'for controlling its displacement to maintain a substantially constant inlet pressure, and means mechanically coupled with the driving section and hydraulically connected with said units for metering the quantity of uid passing through each of said variable displacement units in predetermined ratio to the longitudinal movement 'of the strip through the driving section.
6. In a sectional machine for operating on strip material the combination of a driving section having means for engaging the strip and moving it longitudinally, power means for driving the driving secizlon at a controlled speed, a supply reel section from which the strip is unreeled by the pull of the driving section, a take-up reel section onto which the strip is `reeled after leaving the driving section, and means for controlling the` tension of the strip between said three sections comprising a variable displacement pump unit coupled to the supply reel section and having means for controlling its displacement to maintain a substantially constant delivery pressure, a variable displacement motor unit coupled with `the take-up reel section and having means for controlling its displacement to maintain a sub- 'f units being adjustable to regulate to diierent pressures whereby the strip tension on one side of the driving section may be varied relative to that on the other side thereof.
7. In a sectional machine for operating on strip material the combination of a driving section having means for engaging the strip and moving it longitudinally, power means for driving the driving section at a controlled speed, a
supply reel section from which the strip is unreeled by the pull of the driving section, a takeup reel section onto which the strip is reeled after leaving the driving section, and means for controlling the tension of the strip between said three sections comprising a variable displacement pump unit coupled to the supply reel section and having means for controlling its displacement to maintain -a substantially constant delivery pressure, a variable displacement motor unit coupled with the take-up reel section and having means for controlling its displacement to maintain a-substantially constant linlet pressure, and means including a xed displacement iluid pressure energy translating device mechanically coupled with the driving section and hydraulically connected with said units for metering the quantity of fluid passing through each of said variable displacement units in predetermined ratio to the longitudinal movement of the strip through the driving section. Y
8. In a sectional machine foroperating on strip material the combination of a driving section having means for engaging the strip and moving it strip material the combination of a Ydriving sec- A tain a substantially constant delivery pressure, a
variable displacement motor unit coupled with the take-up reel section and having means for controlling its displacement to maintain a substantially constant inlet pressure, and means includ'- ing a xed displacement fluid pressure energy translating device mechanically coupled with the driving section and hydraulically connected in a series circuit with both said units for metering the quantity of fluid passing through each of said .variable displacement units in predetermined ratio to the longitudinal movement of the strip through the'driving section.
9. A strip material handling device comprising y l a supply reel from which the strip is to be unwound and a take-up reel onto which the same strip is to be wound, a pair of constantA pressure, variable volume, hydraulic displacement devices, one connected in driving relation to each reel, a
constant volume, variable pressure, hydraulic displacement device, means for driving the lastmentioned device at a controlled speed, and uid supply and return conduits connecting said three devices in a series circuit. e
10. In a sectional machine for operating on tion having means for engaging the strip and moving it longitudinally, power means for driving the driving section at a controlled speed, a supply reel `section from which the strip is unreeled by the pull of the driving section, a take-up reel section onto which the strip is reeled after leaving the driving section, and means for controlling the tension of the strip between said three sections comprising a variable displacement pump unit coupled to the supplyl reel section and having means for controlling its displacement to maintain a substantially constant delivery pressure, a variable displacement motor unit coupled with the take-up reel section land having means for controlling its displacement to maintain a substantially constant inlet pressure, means mechanically coupled with the driving section and hydraulically connected with said units for metering the quantity of fluid passing through'eachA of said variable displacement units in predetermined ratio to the longitudinal movement of the 6 y strikthoushizhcdrivinizsection..niimennlin#A cludingi.vulveselectivelyshiiiumbletociismm-v nectoneofsaidunitstromnidmetermzmelnl -11.. Astripmnteridhandlin'z devicecomln'isinz asupplyxeeltromwhichthextripistobeuni woundandatoke-upreeiontowhichthenme sisx'ipis1:0hevound,ammiro!constanizprenure.A variablevolumghydrsulicdisplacementdevices, oneconnechedindrivingrelstionfoeochnel.:
constant volume. -vu'iable pressure, hydraulic 10 'theremniningtwodevicesinseri mms T. mRRmGToN. Jem RoniNSON.
US357896A 1940-09-23 1940-09-23 Power transmission Expired - Lifetime US2351264A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US357896A US2351264A (en) 1940-09-23 1940-09-23 Power transmission

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US357896A US2351264A (en) 1940-09-23 1940-09-23 Power transmission

Publications (1)

Publication Number Publication Date
US2351264A true US2351264A (en) 1944-06-13

Family

ID=23407470

Family Applications (1)

Application Number Title Priority Date Filing Date
US357896A Expired - Lifetime US2351264A (en) 1940-09-23 1940-09-23 Power transmission

Country Status (1)

Country Link
US (1) US2351264A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2425496A (en) * 1944-10-16 1947-08-12 Oilgear Co Winder drive
US2507297A (en) * 1948-11-26 1950-05-09 Western Electric Co Tension equalizing apparatus
US2626110A (en) * 1948-01-15 1953-01-20 Revere Copper & Brass Inc Constant speed control for strip annealing
US2655060A (en) * 1947-03-19 1953-10-13 Vickers Armstrongs Ltd Hydraulic driving means for winding and rolling machines
US3584804A (en) * 1968-12-13 1971-06-15 Cornelis Johannes Van Os Web winding control
US3704993A (en) * 1970-07-27 1972-12-05 Canada Steel Co Drive system for strip material

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2425496A (en) * 1944-10-16 1947-08-12 Oilgear Co Winder drive
US2655060A (en) * 1947-03-19 1953-10-13 Vickers Armstrongs Ltd Hydraulic driving means for winding and rolling machines
US2626110A (en) * 1948-01-15 1953-01-20 Revere Copper & Brass Inc Constant speed control for strip annealing
US2507297A (en) * 1948-11-26 1950-05-09 Western Electric Co Tension equalizing apparatus
US3584804A (en) * 1968-12-13 1971-06-15 Cornelis Johannes Van Os Web winding control
US3704993A (en) * 1970-07-27 1972-12-05 Canada Steel Co Drive system for strip material

Similar Documents

Publication Publication Date Title
US2194078A (en) Hold-down system
US2291011A (en) Speed governor
US2267380A (en) Hold-down system
US1937077A (en) Reversible hydraulic driving mechanism
US4508281A (en) Hydraulic drive system for cable stringing apparatus
US2285069A (en) Hydraulic feed control system
US2238063A (en) Fluid pressure system and valve mechanism therefor
USRE23300E (en) Cable reel
US1964196A (en) Regulator for hydraulic cylinders
US2283321A (en) Power transmission
US2351264A (en) Power transmission
US2082473A (en) Hydraulic transmission
US2181049A (en) Hydraulic drive
US2779203A (en) Variable speed control
EP0305761B1 (en) Secondarily controlled hydrostatic transmission with an open circuit
US2164600A (en) Hydraulic drive for winding apparatus
US2328980A (en) Power transmission
US2487520A (en) Hydraulic power transmission with bypass flow control valve
US2425496A (en) Winder drive
US2493512A (en) Power transmission
US2437139A (en) Hydraulic speed control apparatus
US2079268A (en) Hydraulic transmission
US3246471A (en) Hydraulic drive control
US2276916A (en) Level winder for cable drum
US2110428A (en) Sectional drive