US3580158A - Liquid level sensing device - Google Patents

Liquid level sensing device Download PDF

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Publication number
US3580158A
US3580158A US3580158DA US3580158A US 3580158 A US3580158 A US 3580158A US 3580158D A US3580158D A US 3580158DA US 3580158 A US3580158 A US 3580158A
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US
United States
Prior art keywords
fluid
developer
reservoir
electrode
conductive
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
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English (en)
Inventor
Peter T Scholle
Samuel L Webb
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.)
AB Dick Co
Original Assignee
Multigraphics Inc
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Publication date
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Publication of US3580158A publication Critical patent/US3580158A/en
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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03D—APPARATUS FOR PROCESSING EXPOSED PHOTOGRAPHIC MATERIALS; ACCESSORIES THEREFOR
    • G03D5/00—Liquid processing apparatus in which no immersion is effected; Washing apparatus in which no immersion is effected
    • G03D5/06—Applicator pads, rollers or strips
    • G03D5/067—Rollers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/24—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid
    • G01F23/241—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid for discrete levels
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03D—APPARATUS FOR PROCESSING EXPOSED PHOTOGRAPHIC MATERIALS; ACCESSORIES THEREFOR
    • G03D3/00—Liquid processing apparatus involving immersion; Washing apparatus involving immersion
    • G03D3/02—Details of liquid circulation
    • G03D3/06—Liquid supply; Liquid circulation outside tanks
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7287—Liquid level responsive or maintaining systems
    • Y10T137/7306—Electrical characteristic sensing
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8158—With indicator, register, recorder, alarm or inspection means
    • Y10T137/8342—Liquid level responsive indicator, recorder or alarm

Definitions

  • SHEET 1 [IF 2 BACKGROUND OF THE INVENTION This invention relates generally to liquid level control arrangements and more particularly to liquid level sensing devices for use with copying machines employing liquid developing apparatus requiring a minimum level of developer fluid to be present at all times.
  • a second reservoir of developer fluid in addition to the main reservoir of develop.- ing solution in which the applicator roller is mounted, a second reservoir of developer fluid. Developer fluid is dispensed from the second reservoir to the first reservoir for the purpose of maintaining the latter filled to the proper level with fluid.
  • the second reservoir is the first to run dry without the critical roller reservoir being effected fora time thereafter.
  • the supply of fluid in the first reservoir could likewise be depleted and the roller surface would once again 1 be damaged by the action of the wiper thereagainst.
  • a preferred embodiment of liquid level sensing apparatus comprises first sensing circuitry for monitoring the level of diazo developing fluid in a reserve fluid tank or container used to feed amain fluid reservoir in which an applicator roller is mounted. Upon detecting the liquid level in the reserve tank to drop below a predetermined level, a warning light or alarm is activated by control means included in the circuitry. If the reserve containeris refilled, the light is deactivated and the system is brought back to a normal condition.
  • second liquid level sensing circuitry monitoring the level-of developer fluid in the main fluid reservoir serves to detect the depletion of fluid below a predetermined level therein.
  • control means of the last-mentioned circuitry respond to shut down completely the developing apparatus, thereby protecting the apparatus from being damaged as described heretofore.
  • FIG. 1 is a diagrammatical representation of a diazo-type developing apparatus'in which a preferred embodiment of the liquid level sensing apparatus according to the invention is employed;
  • FIG. 2 is a schematic diagram of a preferred embodiment of the liquid level sensing circuitryaccordingto the invention.
  • FIG. 1 of the drawings there is shown therein a diagrammatic representation of a diazo-type developing arrangement 10 in which liquid level sensing apparatus according to the invention is employed.
  • the developing arrangement includes a developer section 12 and a reserve fluid section 14.
  • the developer-section 12 includes a reservoir 16 containing a quantity of conductive developer fluid 18.
  • a developer applicator roller 20 Rotatably mounted on the reservoir is a developer applicator roller 20.
  • a fountain roller 21, mounted within reservoir 16 in driving engagement with roller 20, is immersed in the developer fluid 18 and provides roller 20 with developer fluid, thereby maintain ing the surface of roller 20 in a wetted condition while roller 20 is being rotated.
  • the upper roller pair 20, 22 form therebetween a copy sheet developing zone 24.
  • a wiper device in this case an elongated blade member 26, extending the length of the roller 20 is provided adjacent the applicator roller 20 to remove excess developing fluid from the roller surface prior to the application of the developer fluid to a copysheet 28 in .the developing zone. In this manner it is possible to apply a minimum amount of fluid to a copy sheet 28 being developed so as to provide dry-to-tlie-touch copies and eliminate the need for further drying.
  • copy sheet 28 is fed in the direction of arrow 29 through the developing zone 24.
  • a quantity of fluid, metered onto the surface of applicator roller 20 by wiper 26 is applied to the copy sheet as the roller 20 is rotated in a counterclockwise direction as seen in FIG. 1.
  • the copy sheet is developed as it passes through zone 24 and emerges therefrom in a dry-to-the-touchcondition-
  • US. Pat. No. 3,446,620 assigned to the same assignee.
  • the conductive developing fluid 18 in reservoir 16 eventually is depleted therefrom. If the fluid is not replenished,.damage to the applicator roller 20 might.
  • a reserve fluid section 14 comprising a container 30, herein illustrated as an insulative bottle 32 in which developer fluid 18 is present.
  • the bottle 32 includes a cap member 34 of conductive material for sealing the mouth or opening 36 of the bottle.
  • the cap member 34 servesadditional purposes other than merely sealing the bottle 32.
  • a conduit or tube 38 extends into bottle 32 through an aperture 40 in cap member 34.
  • the conduit is connected .to the inlet 42 of a pump 44.
  • a second conduit 46 connected to the outlet 48'of pump 44 terminates at reservoir 16 0f the developer section 12 at spout 50.
  • Pump 44- serves to carry liquid developer from the reserve bottle or supply through conduits 38 and 46 to the developer section, thereby to replenish liquid developer 18 used in the development'of copy sheets.
  • the overflow tube empties into a funnel. 54 connected with the interior of the reserve bottle 32 by means of a tube 56.extending through an aperture 57 in cap member 34..
  • a filter (not. shown) located within funnel 54 serves to remove impurities from the-fluid. as it is circulated.
  • the fluid in the reservebottle 32 will eventually be depleted through continued copy making operations, and similarly the developer fluid.
  • the reservoir wall 70 is connected to In order to protect against the unnoticed depletion of developer fluid orliquid from reserve container 30, as well as the depletion of. fluid from reservoir 16, liquid level sensing apparatus according to theinvention has been provided.
  • a sensing electrode 58 In the reserve fluid section 14 of the developing arrangement, there-is connected to cap member 34 of reserve bottle '32, a sensing electrode 58.
  • the electrode 58 extends a predetermined distance d1 through an aperture 59 in the cap member into the reserve bottle 32.
  • the electrode 58 is constructed with an inner conductive portion 60 which is insulated by means of insulative material 62 from outer conductive portion 64.
  • the outer conductive portion 64 is connected to ground potential via lead 65 connected to conductive cap member 34, while the inner conductive portion 60 is connected via a conductor 66 to circuitry v,jsown in FIG. 2 of the drawings.
  • the circuitry willbe explained in greater detail hereinafter.
  • Electrode 68 herein shown in the form of a screw-type elemerit is mounted through a conductive wall 70 of the reservoir andextends into the interior of reservoir 16. The electrode is ;the applicator roller is maintained in a wetted state.
  • electrode is insulated from the conductive wall of reservoir 16 and is connected to circuitry illustrated in FIG. 2 by means of ground potential via lead 74.
  • FIG. 2 of the drawings there is illustrated therein a schematic diagram of the circuitry included in a preferred embodiment of liquid levelsensing apparatus according to the invention.
  • tacts 122 comprising normally closed terminal 124 and open terminal 118, which-.will be discussed hereinafter.
  • the developer section circuitry 77 is similar to that used in the reserve fluidsection, including an electrode 68, connected at junction 126 to a first resistor 128, which in combination with resistor 82, forms a voltage divider configuration like that formed by resistors 80, 82. Also connected at junction 126 is a diode 130 which in turn is connected to the anode 131 of a trigger diode or SUS 132. SUS 132 is connected at its cathode 133 to the gate electrode 134 of a silicon controlled rectifier (SCR) 136. The SCR is itself connected at electrodes 138, 140 between the grounded side of AC power source 120 and a relay driver circuit 142 (shown in dotted lines) for operating relay 144.
  • SCR silicon controlled rectifier
  • the relay driver circuit includes a full wave bridge 146, a resistor' 148 connected at one side thereof to an output terminal 150 of the bridge and at the other terminal to relay terminal 152.
  • the other relay terminal 154 is connected directly to bridge output tenninal 156.
  • a pair of capacitors 160, 162,v are connected directly to bridge output tenninal 156.
  • relay coil 144 is connected in parallel relation with respect to each other, in parallel relation with relay coil 144.
  • a normally closed set of contacts 164 of relay 144 is connected across SCR 136.
  • the drive motor 166 used to operate the applicator roller 20 (FIG. 1) of the developer section 12, is also connected across a pair of normally closed contacts 168 of relay 144.
  • the related circuit components comprising a capacitor 170 in parallel relation with SUS 132 and the combination capacitor 172 and resistor 174 connected on opposite sides of SUS 132 and to the grounded side of power source 120 via lead 94 are also provided in the developer section circuitry portion of I the liquid level sensing apparatus according to the invention.
  • a first circuit portion 75 of the sche- I matic is provided for monitoring or sensing the level of conductive developer fluid maintained in the Reserve Fluid Section 14 (bottle 32) of the developer arrangement 10, and a second circuit portion 77 is provided for sensing the level of liquid developer in the developer section 12 reservoir 16 of the developing arrangement 10.
  • the gate electrode of silicon-controlled rectifier (SCR) 97 mentioned above, is connected to the cathode 95 of SUS 86 and related circuitry describedv heretofore.
  • the other electrodes 98, 100 of the SCR are connected to ground lead 94 and to a lamp flasher circuit 102 (shown indotted lines) including resistors 104, 106, 108, capacitor 110 and silicon controlled rectifier (SCR) 112.
  • the flasher circuit is connected to a lamp 114 which is connected in turn to one of the power input conductors 116 of 50 volt AC power source 120 via diode 118.
  • the other power input lead 94, connected to AC power source 120 is the ground side thereof and is connected to a normally open terminal of a pair of break-make relay con- These components serve the same purpose as the counterpart components of the'reserve fluid section described heretofore.
  • a clipping (Zener) diode 176 is connected across the output of AC Power Source 120 to leads 178 and 94 to prevent spurious signals from the line, etc., from causing false operation of the circuit components included in the level sensing circuitry.
  • the fluid developer 18 of reserve fluid container 30 (FIG. 1) is the first to be depleted beyond the depth of the electrode 58. As explained above, when this occurs, the current flow through fluid l8 ceases and trigger diode SUS 86 conducts, causing SCR 97 to fire. A resulting output voltage across SCR 97 serves to operate flasher circuit 102, to in turn flash lamp 114, indicating the need for the replenishment of developer fluid in bottle 32.
  • the conductive developer fluid 18 in reservoir 16 soon will also be depleted below the operating level.
  • the'current flow in the developer section between'electrode 68 and the developer fluid 18 ceases, causing the conduction of trigger diode, SUS 132 and the firing or conduction of SCR 136.
  • the latter provides an output voltage at leads 138, 140.
  • the last-mentioned output voltage is sufiicient to operate relay driver circuit 142 which in turn operates relay 144.
  • the operation of relay 144 operates contacts 122, breaking the connection at tenninal 124 and making a connection at terminal 118.
  • flasher circuit 102 will continue to function, flashing lamp 114 to indicate the need for developer fluid in reserve fluid container 30.
  • the flasher circuit will cease to function when the fluid in container is replaced to the proper level.
  • the basic circuitry including an electrode such as 58, 68, a trigger diode (SUS) and associated components and an SCR connected as illustrated in either the developer section orthe reserve fluid section circuitry (FIG. 2) would be used.
  • the output across the SCR would, in the same fashion as illustrated in F1 2 be connected to circuitry for either energizing an alarm circuit, as in the case of reserve fluid section 14, or for performing a control function of some sort, as in the case of developer section 12.
  • Apparatus for developing diazo-type copy sheets by the application of an electrically conductive developing fluid to said copy sheets comprising in combination, a developer section includirg a main reservoir containing a quantity of said conductive eveloper fluid and developer means mounted at said reservoir and operable to apply to the copy sheets said fluid, said developer means including a liquid applicator roller having a surface adapted to carry a predetermined quantity of developer fluid, mounted for rotation within said main reservoir, drive means for rotating said roller, means for supplying developer fluid from said main reservoir to the surface of said applicator roller, and wiper means mounted in wiping engagement with said roller surface for removing excess developer fluid therefrom prior to the application of said fluid to said copy sheets by said roller, a reserve reservoir also containing a quantity of said conductive developer fluid, connected to said main reservoir, from which fluid is dispensed to maintain the supply of developer fluid in said main reservoir at an operating level, pump means for dispensing developer fluid from said reserve reservoir to said main reservoir, and liquid level sensing means comprising first sensing circuit means

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Wet Developing In Electrophotography (AREA)
US3580158D 1969-09-29 1969-09-29 Liquid level sensing device Expired - Lifetime US3580158A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US86157469A 1969-09-29 1969-09-29

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US3580158D Expired - Lifetime US3580158A (en) 1969-09-29 1969-09-29 Liquid level sensing device

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US (1) US3580158A (fr)
BE (1) BE756799A (fr)
CA (1) CA924793A (fr)
FR (1) FR2063060B1 (fr)
GB (1) GB1310840A (fr)
NL (1) NL7013841A (fr)

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3772531A (en) * 1971-11-22 1973-11-13 Creears T H Corp Method and control circuit for liquid level control systems
US3875581A (en) * 1972-07-15 1975-04-01 Ricoh Kk Developing device for copying apparatus of the diazo type
US4024440A (en) * 1975-02-13 1977-05-17 Conax Corporation Water activated pressurized gas release device
US4054148A (en) * 1975-10-06 1977-10-18 Rolf Gurr Cooling device for liquid cooling of thermoplastic extrusions and a calibrating device for thermoplastics extrusions incorporating such a cooling device
US4150372A (en) * 1977-11-07 1979-04-17 Foote Allen Humidity control system
US4186849A (en) * 1978-04-04 1980-02-05 Spangler Searle T Control circuit for automatically monitoring, dispensing, and filling a liquid in a container
EP0008095A1 (fr) * 1978-08-12 1980-02-20 Hoechst Aktiengesellschaft Station de développement pour matériau de diazotypie à deux composants
EP0192282A1 (fr) * 1985-01-24 1986-08-27 Océ-Nederland B.V. Récipient pour la distribution d'un liquide
US4852604A (en) * 1985-10-30 1989-08-01 Automation, Inc. Ink monitor system
WO1989007284A1 (fr) * 1988-02-08 1989-08-10 Eastman Kodak Company Systeme automatique d'amenee et de circulation de liquide pour machine de developpement de films photographiques
EP0488207A2 (fr) * 1990-11-27 1992-06-03 Dainippon Screen Mfg. Co., Ltd. Méthode et dispositif de traitement d'un matériau photosensible
US5179405A (en) * 1990-04-26 1993-01-12 Fuji Photo Film Co., Ltd. Replenisher supply device for photosensitive planographic printing plate processing apparatus
USRE34337E (en) * 1985-06-11 1993-08-10 Imi Cornelius Inc. Beverage dispenser with automatic cup-filling control and method for beverage dispensing
US5427136A (en) * 1991-11-27 1995-06-27 The Langston Corporation Fluid level detection system
US5469879A (en) * 1994-05-23 1995-11-28 Rasmussen; John Condensate trap and drain for systems under pressure
WO1997027054A1 (fr) * 1996-01-24 1997-07-31 Goss Grahic Systems, Inc. Systeme de detection du niveau de l'encre dans une presse a imprimer
US5903223A (en) * 1997-05-01 1999-05-11 Dampp-Chaser Electronics Corporation Humidifier control system
US6256460B1 (en) * 1999-03-30 2001-07-03 Fuji Photo Film Co., Ltd. Detecting device and processing device
US6337959B1 (en) * 1999-11-24 2002-01-08 Samsung Electronics Co., Ltd. Liquid level detector and liquid level measuring apparatus of printer adopting the same
US6485171B1 (en) 1999-12-13 2002-11-26 Goss Graphic Systems, Inc Apparatus and method for sensing the fluid level in a mixing device
US20040047655A1 (en) * 2002-09-09 2004-03-11 Samsung Electronics Co., Ltd. System for supplying high-density developing solution in image forming apparatus
US20050247330A1 (en) * 2004-04-30 2005-11-10 Hp Intellectual Corp. Liquid presence sensor
US7028914B1 (en) 2003-09-29 2006-04-18 Dampp-Chaser Electronics Corporation Piano humidistat

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4165509A (en) * 1977-08-24 1979-08-21 Eaton Corporation Dual liquid level monitor
GB2260000A (en) * 1991-09-28 1993-03-31 Kodak Ltd X-ray processing apparatus

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1979127A (en) * 1933-06-12 1934-10-30 Bender Warrick Corp Electrical control device
US2713678A (en) * 1948-06-17 1955-07-19 Christiania Spigewerk Warning device for cooling water system for transformers
US3179033A (en) * 1962-02-14 1965-04-20 Zindler Lumoprint Kg Device for manufacturing copies
US3206615A (en) * 1962-12-27 1965-09-14 Pointe Joseph Leo La Liquid detector device
US3307466A (en) * 1963-05-27 1967-03-07 Fuji Photo Film Co Ltd Device for applying a treating solution to sensitized paper
US3477460A (en) * 1965-08-02 1969-11-11 Mallory & Co Inc P R Fluid level control system
US3498131A (en) * 1967-08-29 1970-03-03 Eltop Corp Liquid level measuring or indicating device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1979127A (en) * 1933-06-12 1934-10-30 Bender Warrick Corp Electrical control device
US2713678A (en) * 1948-06-17 1955-07-19 Christiania Spigewerk Warning device for cooling water system for transformers
US3179033A (en) * 1962-02-14 1965-04-20 Zindler Lumoprint Kg Device for manufacturing copies
US3206615A (en) * 1962-12-27 1965-09-14 Pointe Joseph Leo La Liquid detector device
US3307466A (en) * 1963-05-27 1967-03-07 Fuji Photo Film Co Ltd Device for applying a treating solution to sensitized paper
US3477460A (en) * 1965-08-02 1969-11-11 Mallory & Co Inc P R Fluid level control system
US3498131A (en) * 1967-08-29 1970-03-03 Eltop Corp Liquid level measuring or indicating device

Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3772531A (en) * 1971-11-22 1973-11-13 Creears T H Corp Method and control circuit for liquid level control systems
US3875581A (en) * 1972-07-15 1975-04-01 Ricoh Kk Developing device for copying apparatus of the diazo type
US4024440A (en) * 1975-02-13 1977-05-17 Conax Corporation Water activated pressurized gas release device
US4054148A (en) * 1975-10-06 1977-10-18 Rolf Gurr Cooling device for liquid cooling of thermoplastic extrusions and a calibrating device for thermoplastics extrusions incorporating such a cooling device
US4150372A (en) * 1977-11-07 1979-04-17 Foote Allen Humidity control system
US4186849A (en) * 1978-04-04 1980-02-05 Spangler Searle T Control circuit for automatically monitoring, dispensing, and filling a liquid in a container
EP0008095A1 (fr) * 1978-08-12 1980-02-20 Hoechst Aktiengesellschaft Station de développement pour matériau de diazotypie à deux composants
US4284343A (en) * 1978-08-12 1981-08-18 Hoechst Aktiengesellschaft Apparatus for the electric level control of a developing solution in a storage tank
EP0192282A1 (fr) * 1985-01-24 1986-08-27 Océ-Nederland B.V. Récipient pour la distribution d'un liquide
AU576930B2 (en) * 1985-01-24 1988-09-08 Oce-Nederland B.V. Liquid supply reservoir
USRE34337E (en) * 1985-06-11 1993-08-10 Imi Cornelius Inc. Beverage dispenser with automatic cup-filling control and method for beverage dispensing
US4852604A (en) * 1985-10-30 1989-08-01 Automation, Inc. Ink monitor system
WO1989007284A1 (fr) * 1988-02-08 1989-08-10 Eastman Kodak Company Systeme automatique d'amenee et de circulation de liquide pour machine de developpement de films photographiques
US5179405A (en) * 1990-04-26 1993-01-12 Fuji Photo Film Co., Ltd. Replenisher supply device for photosensitive planographic printing plate processing apparatus
EP0488207A3 (en) * 1990-11-27 1993-02-03 Dainippon Screen Mfg. Co., Ltd. Method and apparatus for processing photosensitive material
EP0488207A2 (fr) * 1990-11-27 1992-06-03 Dainippon Screen Mfg. Co., Ltd. Méthode et dispositif de traitement d'un matériau photosensible
US5427136A (en) * 1991-11-27 1995-06-27 The Langston Corporation Fluid level detection system
US5469879A (en) * 1994-05-23 1995-11-28 Rasmussen; John Condensate trap and drain for systems under pressure
GB2320222B (en) * 1996-01-24 1999-05-12 Goss Graphic Syst Inc Fluid level detection system for ink in a printing press
WO1997027054A1 (fr) * 1996-01-24 1997-07-31 Goss Grahic Systems, Inc. Systeme de detection du niveau de l'encre dans une presse a imprimer
US5694974A (en) * 1996-01-24 1997-12-09 Goss Graphic Systems, Inc. Fluid level detection system for ink in a printing press
GB2320222A (en) * 1996-01-24 1998-06-17 Goss Graphic Syst Inc Fluid level detection system for ink in a printing press
US5903223A (en) * 1997-05-01 1999-05-11 Dampp-Chaser Electronics Corporation Humidifier control system
US6256460B1 (en) * 1999-03-30 2001-07-03 Fuji Photo Film Co., Ltd. Detecting device and processing device
US6337959B1 (en) * 1999-11-24 2002-01-08 Samsung Electronics Co., Ltd. Liquid level detector and liquid level measuring apparatus of printer adopting the same
US6485171B1 (en) 1999-12-13 2002-11-26 Goss Graphic Systems, Inc Apparatus and method for sensing the fluid level in a mixing device
US20040047655A1 (en) * 2002-09-09 2004-03-11 Samsung Electronics Co., Ltd. System for supplying high-density developing solution in image forming apparatus
US7028914B1 (en) 2003-09-29 2006-04-18 Dampp-Chaser Electronics Corporation Piano humidistat
US20050247330A1 (en) * 2004-04-30 2005-11-10 Hp Intellectual Corp. Liquid presence sensor

Also Published As

Publication number Publication date
GB1310840A (en) 1973-03-21
CA924793A (en) 1973-04-17
FR2063060A1 (fr) 1971-07-02
BE756799A (fr) 1971-03-01
NL7013841A (fr) 1971-03-31
FR2063060B1 (fr) 1975-02-21

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