US2887029A - Developer feed tank apparatus - Google Patents

Developer feed tank apparatus Download PDF

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Publication number
US2887029A
US2887029A US42447454A US2887029A US 2887029 A US2887029 A US 2887029A US 42447454 A US42447454 A US 42447454A US 2887029 A US2887029 A US 2887029A
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United States
Prior art keywords
developer
tank
feed tank
rollers
liquid
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Expired - Lifetime
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Druce William John
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BASF Catalysts UK Holdings Ltd
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Engelhard Industries Ltd
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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
    • 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
    • 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
    • Y10T137/7498—Barometric

Definitions

  • the invention relates to a semi-dry developer unit for use in photo-contact printing processes of the kind in which a sheet of sensitized paper after the printing operation is passed for development between a pair of rollers which take up and carry a film of developing solution, from a tank.
  • the invention is of particular application to a method and apparatus of the kind described and claimed in the co-pending application of the United Kingdom No. 12679/53.
  • the invention has among its objects to provide a developer unit in which the print is evenly wetted over the whole surface in its passage between the rollers of the developer unit; is readily removed in a semi-dry condition after its passage between the rollers, and in which the developer solution is maintained without substantial fluctuation in level in the tank of the developer unit.
  • the developer unit comprises a pair of rollers mounted in superposed relation with the lower roller in the tank of developer solution and means for controlling the level of liquid in the tank consisting of a feed tank in communication with the developer tank and a cylindrical drum mounted for vertical movement in guides in the feed tank with a short length of pipe, advantageously provided at a mid-position in the length of the drum and projecting both inwardly and outwardly of the drum, whereby the drum can be filled with the outwardly projecting end of pipe directed upwardly and after filling the drum rotated through 180 into the position in which the said end of pipe is downwardly directed and dips into the liquid in the feed tank.
  • lateral holes are drilled in that length of pipe projecting inwardly into the drum to facilitate even flow of liquid from the drum to the tank as the level of the liquid in the tank falls.
  • the lower of the two rollers is formed of a hard substance such as rubber and the upper of the two rollers made of a resilient substance such for example as porous rubber, the two rollers being in peripheral contact, so that the sheet of material to which the developer is to be applied on being passed between the rollers is covered over its entire surface with a thin even film of developer liquid, and on passing out between the rollers is semi-dried by the pressure exerted between the rollers.
  • the roller made of a resilient substance serves to absorb solution which is squeezed out on to the print on being passed in between the rollers and, excess liquid absorbed by the roller on the passage of the sheet out.
  • an adjacent series of fingers advantageously made of a plastic material are pivotally mounted to extend across the width of the lower of the rollers with their ends closely adjacent or lightly in contact with the periphery of the roller, whereby any tendency of the print to stick to the roller is avoided and the print peeled from the roller.
  • Figure l is a plan view of the developer unit
  • Figure 2 is a section on the line A--A of Figure 1;
  • Figure 3 is a section on the line BB of Figure 1;
  • Figure 4 is a section on the line CC of Figure l.
  • Figures 5, 6 and 7 are respectively side elevation, end elevation and plan of a finger.
  • a long developer tank 1 of rectangular section is supported in brackets 2.
  • a lower roller 3 mounted for rotation with the lower peripheral surface in contact with the liquid in the tank.
  • an upper roller 4 mounted above and in contact with the roller 3 and slightly out of vertical alignment is an upper roller 4 made of a resilient porous substance, such as sponge rubber having non-communicating cells.
  • the rollers are of equal length and extend substantially the length of the tank 1.
  • the lower roller 3 is rotatable as through a shaft 5 projecting through a slot in one end bracket 2, from a source of power.
  • the tank 1 extends through the bracket and is connected as by welding at a midposition at the bottom of a transversely disposed feed tank 6 of rectangular section.
  • Eccentrically mounted on a shaft 7 which is adapted for limited rotation is a cylinder 9.
  • the shaft 7 together with the cylinder 9 is mounted in slots 8 formed in the end walls of the feed tank 6.
  • a short pipe 11 is mounted in the lower part of the cylinder 9 so as to project inwardly to a slightly greater extent than outwardly.
  • Diametrically oppositely disposed pairs of holes 12 are formed in the inwardly projecting ends of the pipe 11.
  • the shaft 7 on which the cylinder 9 is eccentrically mounted is extended and bent at right angles in such manner as to be adapted to be snapped into two fixed positions between two pairs of spring arms 13 and 14, these two fixed positions corresponding to the filling position with the pipe 11 upwardly directed and the operative position in which the pipe is downwardly directed, and at to the first or filling position.
  • fingers 15 Pivotally mounted in series to bear with their ends on the peripheral surface of the lower roller 3 are fingers 15 made of a plastic substance and formed to a section to present a rib 16 which is effective to prevent the developer solution collecting on it, and preventing an uneven application of developer to the leading edge of the print on ejection from between the developer rollers.
  • the sensitized print after being subjected in contact with the master to a source of light is passed between the rollers 3, 4.
  • the roller 4 absorbs the developer solution which is evenly smeared over the whole surface of the print on passing in-between the rollers.
  • the upper roller 4 from which the solution has been pressed out by contact with the hard rubber roller 3, is now effective to absorb any surplus liquid left on the print, which thus issues in a semi-dry condition.
  • the holes 12 serve to render the automatic feed of the feed tank 6 more sensitive, so that there is substantially no fluctuation in the level of the developer liquid in the tank 1.
  • the cylinder is rotated until the projecting end of the pipe 11- is uppermost in which position the end of the shaft 7 is snapped between the spring arms 13 so that the cylinder is held against movement during the filling operation.
  • the cylinder is rotated through 180 into the position in which the pipe 11 extends vertically downwards and the bent end of the arm of the shaft 7 i is snapped into position between the spring arms 14.
  • Feed tank apparatus adapted to be connected to a developer tank for feeding a liquid supply to said developer tank and maintaining the level of the liquid in said developer tank, comprising a feed tank for holding liquid to be fed to the developer tank, a cylinder with sealed ends within said feed tank mounted for pivotal movement to a filling position and to an operative feeding position, a short open ended pipe sealed into the wall of the cylinder to project inwardly and outwardly to the cylinder, the outwardly projecting end of said pipe being adapted in the feeding position to dip into the liquid in said feed tank to maintain the level of the liquid in said feed tank which correspondingly maintains the level of the liquid in the developer tank in communication with said feed tank.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Photographic Developing Apparatuses (AREA)

Description

May 19, 1959 w. J. DRUCE DEVELOPER FEED TANK APPARATUS 2 Sheets-Sheet 1 Filed April 20. 1954 IvwemTov A Wovmzy S y 19, 1 5 w. J. DRUCE 2,887,029
DEVELOPER FEED TANK APPARATUS Filed April 20, 1954 Q 2 Sheets-Sheet 2 United States Patent DEVELOPER FEED TANK APPARATUS William John Druce, Cippenham, Slough, England, assignor to Engelhard Industries Limited, London, England, a British company Application April 20, 1954, Serial No. 424,474
Claims priority, application Great Britain April 7, 1954 1 Claim. (Cl. 95-89) The invention relates to a semi-dry developer unit for use in photo-contact printing processes of the kind in which a sheet of sensitized paper after the printing operation is passed for development between a pair of rollers which take up and carry a film of developing solution, from a tank.
The invention is of particular application to a method and apparatus of the kind described and claimed in the co-pending application of the United Kingdom No. 12679/53.
The invention has among its objects to provide a developer unit in which the print is evenly wetted over the whole surface in its passage between the rollers of the developer unit; is readily removed in a semi-dry condition after its passage between the rollers, and in which the developer solution is maintained without substantial fluctuation in level in the tank of the developer unit.
According to the invention, the developer unit comprises a pair of rollers mounted in superposed relation with the lower roller in the tank of developer solution and means for controlling the level of liquid in the tank consisting of a feed tank in communication with the developer tank and a cylindrical drum mounted for vertical movement in guides in the feed tank with a short length of pipe, advantageously provided at a mid-position in the length of the drum and projecting both inwardly and outwardly of the drum, whereby the drum can be filled with the outwardly projecting end of pipe directed upwardly and after filling the drum rotated through 180 into the position in which the said end of pipe is downwardly directed and dips into the liquid in the feed tank.
According to the invention furthermore, lateral holes are drilled in that length of pipe projecting inwardly into the drum to facilitate even flow of liquid from the drum to the tank as the level of the liquid in the tank falls.
According to the invention furthermore, the lower of the two rollers is formed of a hard substance such as rubber and the upper of the two rollers made of a resilient substance such for example as porous rubber, the two rollers being in peripheral contact, so that the sheet of material to which the developer is to be applied on being passed between the rollers is covered over its entire surface with a thin even film of developer liquid, and on passing out between the rollers is semi-dried by the pressure exerted between the rollers. Thus it will be understood that the roller made of a resilient substance serves to absorb solution which is squeezed out on to the print on being passed in between the rollers and, excess liquid absorbed by the roller on the passage of the sheet out.
According to the invention furthermore, an adjacent series of fingers advantageously made of a plastic material are pivotally mounted to extend across the width of the lower of the rollers with their ends closely adjacent or lightly in contact with the periphery of the roller, whereby any tendency of the print to stick to the roller is avoided and the print peeled from the roller.
2,887,029 Patented May 19, 1959 The invention further comprises the features of construction hereinafter described.
The invention is diagrammatically illustrated by way of example in the accompanying drawings, in which:
Figure l is a plan view of the developer unit;
Figure 2 is a section on the line A--A of Figure 1;
Figure 3 is a section on the line BB of Figure 1;
Figure 4 is a section on the line CC of Figure l; and
Figures 5, 6 and 7 are respectively side elevation, end elevation and plan of a finger.
In carrying the invention into effect according to the construction illustrated in the drawings, a long developer tank 1 of rectangular section is supported in brackets 2. Mounted for rotation with the lower peripheral surface in contact with the liquid in the tank is a lower roller 3 made of hard rubber. Mounted above and in contact with the roller 3 and slightly out of vertical alignment is an upper roller 4 made of a resilient porous substance, such as sponge rubber having non-communicating cells. The rollers are of equal length and extend substantially the length of the tank 1. The lower roller 3 is rotatable as through a shaft 5 projecting through a slot in one end bracket 2, from a source of power. At the other end, the tank 1 extends through the bracket and is connected as by welding at a midposition at the bottom of a transversely disposed feed tank 6 of rectangular section.
Eccentrically mounted on a shaft 7 which is adapted for limited rotation is a cylinder 9. The shaft 7 together with the cylinder 9 is mounted in slots 8 formed in the end walls of the feed tank 6. A short pipe 11 is mounted in the lower part of the cylinder 9 so as to project inwardly to a slightly greater extent than outwardly. Diametrically oppositely disposed pairs of holes 12 are formed in the inwardly projecting ends of the pipe 11.
The shaft 7 on which the cylinder 9 is eccentrically mounted is extended and bent at right angles in such manner as to be adapted to be snapped into two fixed positions between two pairs of spring arms 13 and 14, these two fixed positions corresponding to the filling position with the pipe 11 upwardly directed and the operative position in which the pipe is downwardly directed, and at to the first or filling position.
Pivotally mounted in series to bear with their ends on the peripheral surface of the lower roller 3 are fingers 15 made of a plastic substance and formed to a section to present a rib 16 which is effective to prevent the developer solution collecting on it, and preventing an uneven application of developer to the leading edge of the print on ejection from between the developer rollers.
In operation, the sensitized print after being subjected in contact with the master to a source of light is passed between the rollers 3, 4. The roller 4 absorbs the developer solution which is evenly smeared over the whole surface of the print on passing in-between the rollers. On emerging, the upper roller 4 from which the solution has been pressed out by contact with the hard rubber roller 3, is now effective to absorb any surplus liquid left on the print, which thus issues in a semi-dry condition.
The holes 12 serve to render the automatic feed of the feed tank 6 more sensitive, so that there is substantially no fluctuation in the level of the developer liquid in the tank 1.
To fill the cylinder 9, the cylinder is rotated until the projecting end of the pipe 11- is uppermost in which position the end of the shaft 7 is snapped between the spring arms 13 so that the cylinder is held against movement during the filling operation. After the filling operation is completed, the cylinder is rotated through 180 into the position in which the pipe 11 extends vertically downwards and the bent end of the arm of the shaft 7 i is snapped into position between the spring arms 14.
I claim:
Feed tank apparatus adapted to be connected to a developer tank for feeding a liquid supply to said developer tank and maintaining the level of the liquid in said developer tank, comprising a feed tank for holding liquid to be fed to the developer tank, a cylinder with sealed ends within said feed tank mounted for pivotal movement to a filling position and to an operative feeding position, a short open ended pipe sealed into the wall of the cylinder to project inwardly and outwardly to the cylinder, the outwardly projecting end of said pipe being adapted in the feeding position to dip into the liquid in said feed tank to maintain the level of the liquid in said feed tank which correspondingly maintains the level of the liquid in the developer tank in communication with said feed tank.
References Cited in the file of this patent UNITED STATES PATENTS Thornton Jan. 18, Murck Dec. 20, Hall -1 June 27, Murck Sept. 17, Nomiya Sept. 13, Lankes et al. Aug. 8, Alink et al. Sept. 12, Debrie Feb. 27, Van Der Grinten May 6, Nagels et a1 Aug. 5,
FOREIGN PATENTS France Jan. 29,
US42447454 1954-04-07 1954-04-20 Developer feed tank apparatus Expired - Lifetime US2887029A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3038492A (en) * 1957-05-31 1962-06-12 Barmart Automatic coffee brewer
US3357337A (en) * 1965-05-17 1967-12-12 Polaroid Corp Photographic process and apparatus for producing photographic images
US3875581A (en) * 1972-07-15 1975-04-01 Ricoh Kk Developing device for copying apparatus of the diazo type

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1169096A (en) * 1913-05-09 1916-01-18 John Owden O Brien Apparatus for developing and finishing cinematograph color-films.
US1891722A (en) * 1931-09-22 1932-12-20 Bruning Charles Co Inc Sensitized paper developing apparatus
US1916108A (en) * 1930-04-07 1933-06-27 Hall Benjamin Fairfax Machine for developing photographic prints
US2014744A (en) * 1934-09-12 1935-09-17 Bruning Charles Co Inc Method and apparatus for developing and treating sheets of sensitized paper
US2140432A (en) * 1936-12-05 1938-12-13 Berkeley Frank K Nomiya Storage battery water supply fountain
US2168997A (en) * 1937-12-16 1939-08-08 Eastman Kodak Co Liquid applying pan
US2172783A (en) * 1936-05-29 1939-09-12 Philips Nv Method and device for developing
US2191850A (en) * 1936-12-21 1940-02-27 Debrie Andre Leon Vict Clement Film developing machine
FR854896A (en) * 1938-07-14 1940-04-26 Roto Und Debego Werke Ag Wetting device for multicopy of reverse writing clichés
US2241104A (en) * 1939-01-19 1941-05-06 Naamlooze Vennootschap Chemisc Process and apparatus for the treatment of photographic coatings
US2605684A (en) * 1947-10-06 1952-08-05 Grinten Chem L V D Apparatus for semiwet development of photoprints

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1169096A (en) * 1913-05-09 1916-01-18 John Owden O Brien Apparatus for developing and finishing cinematograph color-films.
US1916108A (en) * 1930-04-07 1933-06-27 Hall Benjamin Fairfax Machine for developing photographic prints
US1891722A (en) * 1931-09-22 1932-12-20 Bruning Charles Co Inc Sensitized paper developing apparatus
US2014744A (en) * 1934-09-12 1935-09-17 Bruning Charles Co Inc Method and apparatus for developing and treating sheets of sensitized paper
US2172783A (en) * 1936-05-29 1939-09-12 Philips Nv Method and device for developing
US2140432A (en) * 1936-12-05 1938-12-13 Berkeley Frank K Nomiya Storage battery water supply fountain
US2191850A (en) * 1936-12-21 1940-02-27 Debrie Andre Leon Vict Clement Film developing machine
US2168997A (en) * 1937-12-16 1939-08-08 Eastman Kodak Co Liquid applying pan
FR854896A (en) * 1938-07-14 1940-04-26 Roto Und Debego Werke Ag Wetting device for multicopy of reverse writing clichés
US2241104A (en) * 1939-01-19 1941-05-06 Naamlooze Vennootschap Chemisc Process and apparatus for the treatment of photographic coatings
US2605684A (en) * 1947-10-06 1952-08-05 Grinten Chem L V D Apparatus for semiwet development of photoprints

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3038492A (en) * 1957-05-31 1962-06-12 Barmart Automatic coffee brewer
US3357337A (en) * 1965-05-17 1967-12-12 Polaroid Corp Photographic process and apparatus for producing photographic images
US3875581A (en) * 1972-07-15 1975-04-01 Ricoh Kk Developing device for copying apparatus of the diazo type

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