US3896468A - Apparatus for wet treatment of photographic materials or the like - Google Patents

Apparatus for wet treatment of photographic materials or the like Download PDF

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Publication number
US3896468A
US3896468A US472899A US47289974A US3896468A US 3896468 A US3896468 A US 3896468A US 472899 A US472899 A US 472899A US 47289974 A US47289974 A US 47289974A US 3896468 A US3896468 A US 3896468A
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US
United States
Prior art keywords
hose
vessel
liquid
insulator
heating element
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
US472899A
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English (en)
Inventor
Jurgen Muller
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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
Priority claimed from DE19732326679 external-priority patent/DE2326679C3/de
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Application granted granted Critical
Publication of US3896468A publication Critical patent/US3896468A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03D—APPARATUS FOR PROCESSING EXPOSED PHOTOGRAPHIC MATERIALS; ACCESSORIES THEREFOR
    • G03D13/00—Processing apparatus or accessories therefor, not covered by groups G11B3/00 - G11B11/00
    • G03D13/006—Temperature control of the developer

Definitions

  • the present invention relates to apparatus for wet treatment of photographic materiaL. such as webs or sheets of photographic. film. paper or the like. More particularly, the invention relates to improvements in apparatus wherein discrete sheets, webs, strips or the like must be transported through a body of liquid which is heated so that its tempe ature is maintained within a predetermined range.
  • a heating unit including one or more elongated heating rods which are connected with a source of electrical energy and are fluidtightly confined in corrosion-resistant metallic pipes.
  • Such heating units are quite expensive because each rod must be sealingly received'in a discrete pipe, because the pipes must consist of a material which can stand the chemical action of fluids used for the processing of photographic material, and also because each rod must be insulated from the metallic material of the respective pipe.
  • An object of the invention is to provide a novel and improved apparatus for wet treatment of sheets or webs of photographic material or the like at a predetermined temperature or within a predetermined temperature range.
  • Another object of the invention is to provide an apparatus which meets all existing requirements regarding the safety of employees and/or prevention of fires but is simpler, less expensive and longer-lasting than heretofore known apparatus.
  • a further object of the invention is to provide novel and improved means for heating a body of water or another liquid in a vessel for wet treatment of photographic sheet or strip material.
  • An additional object of the invention is to provide an apparatus wherein one or more parts which are likely or expected to break or to undergo other damage can be rapidly replaced with prefabricated parts at a minimum of cost and without necessitating material alterations of the remaining parts and/or lengthy interruptions in operation.
  • Still another object of the invention is to provide a novel and improvedheating unit which can be used in apparatus for wet treatment of photographic sheet or web material which can be installed in existing vessels presently using conventional types of heating units.
  • the invention is embodiedin an apparatus for wet treatment of photographic sheets, webs or the like and comprises a vessel for a body of water or another liquid.
  • the vessel comprises one or more overflow openings or analogous means for maintaining the upper surface of the body of liquid therein below a predetermined level, and the apparatus further includes novel and improved means for heating the body of liquid in the vessel.
  • the heating means comprises at least one insulator (preferably an elongated tube or rod) consisting of glass or other brittle material, at least one filament, wire, rod oran analogous electric resistance heating element which is confined in the insulator, a flexible hose which sealingly surrounds the insulator and the heating element therein and at least one end of which extends above the aforementioned level. and conductor means extending through the one end of the hose and connecting the heating element with a suitable source of electrical energy.
  • the hose preferably consists of an insulating synthetic plastic material which can withstand the corrosive action of liquid in the vessel as well as the temperature at which the liquid is maintained when the circuit of the electric heating element is completed.
  • the hose is shrunk onto and thus closely follows the contour or contours of one or more insulators therein.
  • Such insulator or insulators can be maintained tion, together with additional features and advantages thereof, will be best understood upon perusal of the following detailed description of certain specific embodiments with reference to the accompanying drawing.
  • FIG. 1 is a plan view of an apparatus which embodies the invention
  • FIG. 2 is a longitudinal vertical sectional view as seen in the direction of arrows from the line IIII of FIG. 1;
  • FIG. 3 is a transverse vertical sectional view as seen in the direction of arrows from the line III-III of FIG. 1.
  • the apparatus which is shown in FIGS. 1-3 comprises an elongated trough-shaped vessel or tank 1 which may consist of a corrosion-resistant synthetic plastic material and supports one or more rollers, drums or analogous rotary devices (not shown) for the transport of continuous webs and/or discrete sheets of photographic material through a body of liquid.
  • a body of liquid can fill the vessel 1 to the level of the lowermost portion of an overflow opening lb provided I in an upright end wall 1a of the vessel 1.
  • the liquid which overflows through the opening 1b enters a compartment or chamber 10 which is adjacent to the end wall 1a.
  • the compartment 10 has an outlet (not shown) through which the liquid can leave to be introduced into a suitable regenerating unit or to be discharged into a drain. It will be noted that the opening lb prevents the upper surface of liquid in the vessel 1 from rising above the level 1d.
  • the upper edge portions of theend walls 1a, 1e of the vessel 1 are connected to or removably support an I elongated plate-like bridge memberor rail 2 which is located above the level 1d.
  • the bridge member 2 preferably consists of a corrosion-resistant metallic alloy.
  • the underside of the bridge member 2 is connected with the web of a U-shaped distancing member 3 having two flanges 3a, 3b which extend downwardly into the body of liquid in the vessel 1.
  • the lower edge faces of the flanges 3a, 3b have recesses or sockets 31' (see FIG.
  • each tube has a relatively thin cylindrical wall with a helical metallic filament (11A or 12A) embedded into such wall.
  • the terminals of each filament are connected to conductor means which serve to connect the filaments with a suitable source of electrical energy.
  • the conductor means may extend through one or both end portions 4a, 4b of the flexible hose 4.
  • Each of the conductor means is surrounded by a suitable flexible sheath of insulating material.
  • the filaments 11A, 11B are embedded into the tubesll, 12 while the material of the tubes is in a molten state so that, once the vitreous material sets, the filaments are fluid-tightly sealed therein save for the terminals which are connected with the conductor means.
  • the hose 4 is longer than the tube 1 l or 12; for example, the overall length of the hose may be twice the length of a tube and the tubes are preferably located midway between the end portions 4a, 4b. Those parts (4c, 4d) of the hose 4 which extend beyond the ends of the tubes 11, 12 are bent upwardly and extend through suitable holes of the bridge member 2. The end portions 4a, 4b are sealed and secured to the upper side of the bridge member 2 by discrete sheet metal clamps 5, 6 best shown in FIG. 1.
  • That portion of the hose 4 which is shrunk onto the tubes 11, 12 extends into the sockets 3c of the flanges 3a, 3b so that the member 3 maintains the tubes at a predetermined distance from the level 1d and in the body of liquid which is confined in the vessel 1.
  • the reference characters 4, 4" denote those portions of the hose 4 which are shrunk onto the largerdiameter end portions of the tubes 11, 12; such end portions surround the terminals of the respective heating elements 11A, 12A. It will be noted that the portions 4, 4" are located at the opposite ends of the two parallel tubes 11 and 12. The tendency of the hose 4 to straighten automatically insures that the ends of the tubes 11, 12 extend into the sockets 3c of the flanges 3a, 3b when the portions 4c, 4d are flexed in a manner shown in FIG. 2, i.e., when the end portions 4a, 4b are clamped to the upper side of the bridge member 2.
  • the conductor means of the apparatus shown in FIGS. l-3 comprises two insulated conductors 7, 8 which respectively extend through and beyond the end portions 4b, 4a of the hose 4. These conductors are connected to a temperature regulating device 10 (e.g., a conventional thermostat) which is preferably adjustable to insure that the temperature of liquid in the vessel l is maintained within a predetermined range;
  • the temperature sensing element or elements of the regulating device 10 monitor the temperature of liquid in the vessel 1; such sensing device or devices can be installed in the hose 4 to be held out of direct contact with the body of liquid and they can be connected with the regulating device 10 by one or more wires in the sheath of the conductor 7 or 8.
  • the improved heating means is susceptible of many further modifications.
  • the hose 4 can be shrunk onto a single glass tube or onto three or more glass tubes. It has been'found that, in most instances, two commerically available glass tubes (with their heating elements connected in series) suffice to insure proper tempering of liquid in the vessel of a photographic developing, fixing, rinsing or like unit. The heat furnished by such pairs of tubes can be readily withstood by a plastic hose.
  • the median portion of the hose 4 can surround one or more plate-like spacers (see the plate 9 in FIG. 3) serving to maintain the tubes 11 and 12 in parallelism with and at an optimum distance from each other.
  • the spacer or spacers 9 preferably consist of a metallic material which is a good conductor of heat so as to insure a uniform distribution of heat to the entire median portion of the hose 4 which latter exchanges heat with the surrounding liquid. 7
  • the apparatus can be equipped with means for insuring that the upper surface of the body of liquid in the vessel 1 can not descend below the level 1d.
  • the opening 2a of the bridge member can receive the neck of a liquid-containing bottle which supplies liquid into the vessel whenever the upper surface of the body of liquid in the vessel 1 descends below the level 1d.
  • Such types of liquid supplying means are known in the art of treatment of photographic films or the like as well as in many other arts. They are commonly known as fountains.
  • An important advantage of the improved apparatus is that its heating means is much less expensive than but just as safe as presently known heating means wherein the electric resistance heating elements are confined in and insulated from corrosion-resistant metallic piping.
  • the hose 4 confines the fragments in the event of breakage of the tube 11 and/or 12 and constitutes a fluid-tight seal around the tubes and heating elements 11A, 12A.
  • the end portions 4a, 4b of the tube 4 extend well above the level la and are sealed by the clamps 5, 6, the heating elements and their terminals are protected againstcontact with water or another liquid even if such liquid is poured onto the upper side of the bridge member 2, for example, during placing of the neck of a filled bottle onto the opening 2a.
  • a further important advantage of the improved apparatus is that the entire heating means can be readily replaced within short periods of time. Thus, if the tube 11 and/or 12 breaks, the person in charge simply removes the screws which connect the clamps 5, 6 to the bridge member 2 and disconnects the conductors 7, 8 from the regulating device 10. The hose 4 is then removed and replaced by a hose containing one or more intact glass tubes. The apparatus can be furnished with one or more spare heating means.
  • the hose Since the hose is flexible, it not only intercepts the fragments in the event of breakage of the tube 11 or 12 but also reduces the likelihood of such breakage since it can yield in response to stresses which, in theabsence of the hose, would be transmitted directly to the tubes and would cause breakage.
  • Apparatus for wet treatment of photographic sheets, webs or the like comprising a vessel for a body of liquid, said vessel having means for maintaining the upper surface of the body of liquid therein below a predetermined level; and means for heating the body of liquid in said vessel, comprising at least one insulator consisting of brittle material, at least one electric resistance heating element confined in said insulator, a flexible hose sealingly surrounding said insulator and said heating element therein, said hose having at least one end portion extending above said level, and electric conductor means extending through said one end portion of said hose and connected to said heating element.
  • said heating means comprises a plurality of insulators and said hose sealingly surrounds said plurality of insulators. each of said insulators confining a discrete heating element.
  • Apparatus as defined in claim 1 further comprising means for regulating the heating action of said heating element, said regulating means being connected to said conductor means outside of the body of liquid in said vessel.
  • said securing means comprises a device for fluid-tightly sealing the end portion of said hose.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Of Resistance Heating (AREA)
  • Resistance Heating (AREA)
  • Photographic Developing Apparatuses (AREA)
US472899A 1973-05-25 1974-05-23 Apparatus for wet treatment of photographic materials or the like Expired - Lifetime US3896468A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19732326679 DE2326679C3 (de) 1973-05-25 Behälter zur Naßbehandlung fotografischer Schichtträger

Publications (1)

Publication Number Publication Date
US3896468A true US3896468A (en) 1975-07-22

Family

ID=5882128

Family Applications (1)

Application Number Title Priority Date Filing Date
US472899A Expired - Lifetime US3896468A (en) 1973-05-25 1974-05-23 Apparatus for wet treatment of photographic materials or the like

Country Status (7)

Country Link
US (1) US3896468A (ko)
JP (1) JPS5028835A (ko)
BE (1) BE815094A (ko)
DK (1) DK279474A (ko)
FR (1) FR2231036B3 (ko)
IT (1) IT1012353B (ko)
NL (1) NL7406814A (ko)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4996999U (ko) * 1972-12-14 1974-08-21
JPS5570779U (ko) * 1978-11-08 1980-05-15

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2178397A (en) * 1937-12-07 1939-10-31 Larkey Riley Emery Electric water heater
US2463386A (en) * 1948-04-08 1949-03-01 Pittsburgh & West Virginia Rai Photographic developing machine having an extensible light-sealing hood and automatic film feed
US2811629A (en) * 1956-10-23 1957-10-29 Eugene G Danner Aquarium heating and indicating device
US3663799A (en) * 1970-10-12 1972-05-16 Angus H Mcarn Fluoroplastic encapsulated electrical resistance heaters
US3737621A (en) * 1971-11-09 1973-06-05 S Elkins Water-immersible electrical heating device
US3796858A (en) * 1972-12-05 1974-03-12 J Cohn Decorative aquarium heater

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2178397A (en) * 1937-12-07 1939-10-31 Larkey Riley Emery Electric water heater
US2463386A (en) * 1948-04-08 1949-03-01 Pittsburgh & West Virginia Rai Photographic developing machine having an extensible light-sealing hood and automatic film feed
US2811629A (en) * 1956-10-23 1957-10-29 Eugene G Danner Aquarium heating and indicating device
US3663799A (en) * 1970-10-12 1972-05-16 Angus H Mcarn Fluoroplastic encapsulated electrical resistance heaters
US3737621A (en) * 1971-11-09 1973-06-05 S Elkins Water-immersible electrical heating device
US3796858A (en) * 1972-12-05 1974-03-12 J Cohn Decorative aquarium heater

Also Published As

Publication number Publication date
JPS5028835A (ko) 1975-03-24
BE815094A (nl) 1974-11-18
DK279474A (ko) 1975-01-13
DE2326679B2 (de) 1976-04-08
DE2326679A1 (de) 1974-12-05
IT1012353B (it) 1977-03-10
FR2231036A1 (ko) 1974-12-20
FR2231036B3 (ko) 1977-03-18
NL7406814A (ko) 1974-10-25

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