US3905698A - Photoprinting apparatus in which developer is replenished in proportion to the treated surface area - Google Patents

Photoprinting apparatus in which developer is replenished in proportion to the treated surface area Download PDF

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US3905698A
US3905698A US499645A US49964574A US3905698A US 3905698 A US3905698 A US 3905698A US 499645 A US499645 A US 499645A US 49964574 A US49964574 A US 49964574A US 3905698 A US3905698 A US 3905698A
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voltage
output
photoprinting
input
paper
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Herbert Schroter
Werner Dennhardt
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Hoechst AG
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Hoechst AG
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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
    • G03D13/007—Processing control, e.g. test strip, timing devices
    • 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
    • G03D3/065—Liquid supply; Liquid circulation outside tanks replenishment or recovery apparatus

Definitions

  • the width of the or ign Application Priority Data paper is detected by discrete switches to produce an Aug. 25, 1973 Germany 2343067 ri l ign l which has a magnitude indicating the width and which is multiplied by a further signal indi- [52] US. Cl 355/27; 354/298 ing he length of p p r- This multiplied signal in [51] Int.
  • the present invention relates to an improved photoprinting apparatus.
  • the DPD process is a dry development process in which fine-grained materials containing certain amines are cascaded over the exposed diaxo paper for development thereof, these amines effecting coupling of the unsplit diazo compounds.
  • small quantities of the amines are constantly extracted from the developer material.
  • This DPD process is described, for example, in German Offenlegungsschrift No. 2,126,160.
  • the present invention generally provides a photoprinting apparatus in which this replenishing may be easily and reliably performed, even in relatively difficult cases, such as the described DPD process.
  • German Offenlegungsschrift No. 1,522,884 describes a regenerating system in which the regeneration coefficient is determined by measuring the blackness and the surface area of the original with the aid of a single photoelectric cell and using the measured value for controlling the supply of fresh developer solution to be added.
  • This method can not be used in conventional photoprinting apparatuses because the quantity of developer consumed is substantially independent of the degree of blackness of the original. Instead, the developer consumption is substantially determined by the area of the photoprinting paper to be developed.
  • German Offenlegunsschrift No. 1,597,650 For regeneration of the developer in continuous photographic developing machines, it has already been proposed, in German Offenlegunsschrift No. 1,597,650, to control the speed of the motor driving the dosing pump by switching different resistors into the motor circuit, using various switches which are actuated by the material passing through the machine and are dependent on the width of the material. Further, it has been suggested, in the same German Offenlegungsschrift, to record the length of the material passing through the machine and to store the values obtained, and to actuate a timer after a predetermined length of material has passed through the machine, so that regenerating material is introduced for an appropriate length of time. This latter method is only suitable for materials of the same width.
  • German Auslegeschrift No. 1,098,362 a process is described according to which the rate of travel of the material through a photoprinting apparatus using ammonia is determined by the evaporation speed. In this process, materials of different widths can not be taken into account, and there is no means for an exact, discontinuous dosage of developer at relatively long inter vals.
  • German Auslegeschrift No. 1,814,980 describes a photoprinting apparatus which comprises a system for supplying liquid developer.
  • This supplying system is operated by an R/C module, the resistance of this R/C module being diminished, in accordance with the width of the photoprinting paper, by shortcircuiting parts of the total resistance.
  • the capacitor voltage necessary for operating the supply system is reached more rapidly in the case of paper of large width than it is for paper of narrower width.
  • This relatively simple device can only be used for the continuous replenishing of developer during operation of the machine. If the developer dosage is to take place at very long intervals, which may even amount to several days, as in the case of the DPD process, this system can not be used.
  • German Utility Pat. No. 1,865,362 describes a photoprinting machine which is provided with a regenerator dosage system and in which photoprinting papers of different widths are withdrawn from magazines.
  • a plurality of microswitches are arranged transversely to the direction of feed, each of these microswitches being connected with a pulse generator transmitting electrical pulses to a counter, which pulses correspond to the length and width of the carrier material.
  • a regenerator dosage system may be provided which is actuated by a defined number of counting pulses indicating the width and length of the photoprinting material. In this apparatus, counting pulses corresponding to the length and the width of the material are thus passed to the counter.
  • German Offenlegungsschrift No. 1,772,564 describes a closing system for use in a developing apparatus operating simultaneously with several webs of paper of different widths.
  • the papers control the application of a voltage to the appropriate number of poles of a multi-pole revolving switch.
  • This switch is driven at a constant speed and operates dosing motors each time it taps a live contact during its revolution. In this manner, the dosage is proportionate to the width and, at the same time, the machine is capable of processing several webs of paper.
  • This last-described device is only suitable for the introduction of developer during development. It can not be used in such cases in which the replenishing of developer substance takes place at very long intervals, possibly after several days. Further, this device may not be used in an apparatus in which the speed of travel of the copying material may be varied.
  • the construction of the apparatus is preferably such that no manual adjustment is necessary when one of the parameters described (length, width, or speed of travel) is varied. Further, the apparatus is preferably simple in construction, cheap in its manufacture, and not susceptible to trouble during operation.
  • a pulse train proportionate to the treated surface area is produced by a pulse genera tor which produces a number of pulses in proportion to the length of the copying material passing through the apparatus and in which the proportionality factor is adjusted according to the width of the copying material being processed, by means of scanners arranged in the path of travel of the copying material.
  • FIG. 1 is a diagrammatic representation showing the arrangement of scanners related to copying materials of different widths.
  • FIG. 2a is a block diagram showing the electric control of the replenishing system according to the invention.
  • FIG. 2b is a modified block diagram.
  • FIG. 3 is a block diagram showing the conversion of an area-related voltage into an arearelated number of pulses.
  • FIG. 4 is a further modification of the electric circuit of a replenishing system according to the invention.
  • FIG. 5 is a block diagram showing a further modification of the electric wiring for the replenishing system according to the invention.
  • FIG. 6 is a block diagram showing an electric wiring for the control of the replenishing system.
  • FIG. 7 is a diagrammatic representation showing an embodiment in which the pulse train is mechanically generated.
  • Switches S1, S2, and S3 are arranged in the path of travel of the photoprinting materials. These conventional switches are so constructed and arranged that the narrowest paper al actuates only switch S1. Paper a2, which is next in width, actuates switch S1 and switch S2, the wiring of switch S2 being such that it simultaneously switches off switch S1.
  • switch S2 is equipped with an on-contact and an off-contact, the off-contact being connected in series with switch S1.
  • switch S3 is provided with an on-contact and an off-contact, and the offcontact of switch S3 is likewise connected in series with the on-contact of switch S2.
  • switch S1 is effective when paper of the width a1 is processed, whereas in the case of paper a2 only switch S2 and in the case of paper a3 only switch S3 is operated.
  • This inter-connection may also be produced by means of electronic logic, e.g. an OR- gate. Any number of switches suitable for a given photocopying machine can be employed.
  • a direct current signal is gener ated in generator 3, the magnitude of the current being proportional to the speed of the copying material.
  • the direct current signal may be produced, for example, by means of a tacho-alternator or by any other known means.
  • a switch S4 is actuated by way of a control unit 4.
  • This control unit may consist of an OR-gate with three inputs each connected to one of the switches S1, S2 or S3, the output of which triggers a transistor having a relay coil in its collector-emitter-path, which relay coil, in turn, actuates switch S4.
  • the OR-gate has only 0 at its output when all its inputs are at 0.
  • the control unit 4 sends a brief electrical pulse through line 40, which serves to reset integrator 5 to zero, which may be effected, for example, by briefly short-circuiting the capacitor (see below) by way of a transistor.
  • the voltage of generator 3 is integrated in the integrator 5.
  • the integrator may be, as shown, an opera tional amplifier having a capacitor circuit in feedback, such as the integrator marketed by Burr-Brown (Burr- Brown Research Corporation, Arlington, Arizona, USA) under the designation 3268.
  • switch S4 Upon detection of the trailing edge of the paper, switch S4 reopens and switches S5 and S7 are closed by switch control unit 7.
  • Unit 7 can similarly consist of conventional logic gates, together with a multivibrator so that switches S5 and S7 are closed for a fixed time.
  • the integrated voltage of generator 3 is applied to input x, of multiplier 8 via closed switch S5 and a voltage signal is applied to the second input y, of multiplier 8 by unit 6, the magnitude of the latter voltage being proportional to the width of the paper.
  • the switches S1, S2 and S3 may each control a different relay in control unit 7 which connect predetermined voltage sources to the switch S7, or alternately the switches may control a transistor, the emitter circuit of which may comprise resistors of different sizes, which, in turn, apply the correct voltage to switch S7.
  • a voltage is produced at the output of multiplier 8 whose magnitude corresponds to the product of the numeral values of the input voltages (for practical reasons multiplied by a factor of 0.1, e.g.).
  • This output voltage of the multiplier 8 is accordingly in proportion to the surface area of the paper passing through the apparatus.
  • This voltage is passed to an analogue-to-digital convertor 9, such as the unit marketed by Burr-Brown under the designation of ADC-3012N- USB.
  • an analogue-to-digital convertor 9 such as the unit marketed by Burr-Brown under the designation of ADC-3012N- USB.
  • pulses are produced whose frequency is proportional to the magnitude of the input voltage.
  • These pulses are coupled to a preset subtraction counter 10, such as the counting unit marketed by Messrs. Landis- Gyr (Zug, Switzerland) under the designation RP 214 E. After reaching a certain preset number, the counter 10 triggers a dosing process by means of its switch 11, e.g.
  • subtract counter 10 is perferably connected to switch control 7 by line 70 so as to be operable only while switches S5 and S7 are closed.
  • the number of pulses emitted by the analogue-todigital converter is proportional to the surface area of the paper which passed through the apparatusv
  • a convertor circuit 17 as diagrammatically shown in FIG. 3 may be used for converting the output voltage of the multiplier 8 into counting pulses.
  • the control unit 7 actuated by the trailing edge of the paper starts a sawtooth generator 12 and a pulse generator 13.
  • the output voltage of the sawtooth generator 12 is passed to one of the inputs of a comparator l4, and the output voltage of the multiplier 8 is passed to the other input of comparator 14.
  • comparator 14 emits a pulse which stops the pulse generator 13, which may be a multivibrator.
  • the pulse generator 13 supplies a number of counting pulses which is proportional to the output voltage of the multiplier 8.
  • These counting pulses are passed to a preset counter 10 which actuates the dosing unit 15 for a predetermined period of time after the preset number as set by preset control 10' has been reached, for example by opening a valve in the amine supply line. Thereafter, the
  • a step-by-step motor may be used, the angular position of which is proportionate to the number of pulses received. If necessary, the stepby-step motor may be preceded by a frequency divider which causes a step to be switched by every twohundredth pulse only, for example. At a specific angular position, the step-by-step motor may release a pulse, either directly or in combination with a gear, which, in turn, effects the addition of a defined quantity of amine.
  • the embodiment shown in FIG. 2b differs from the one just described mainly by the absence of an integrator 5 and the control unit 4 with its associated switch S4, and by a different control unit 71.
  • the switches S1, S2, or S3 When one of the switches S1, S2, or S3 is closed, the switches S5 and S7 are caused to be closed by way of the control unit 71, which may be a relay control] by suitable logic gates.
  • the voltage of the generator 3 the magnitude of which is in proportion to the speed of travel, is applied to input x of the multiplier 8, and a constant voltage is applied to input y, which, by way of unit 6 and depending on which switch is actuated, is proportional to the width of the copying material being processed.
  • the output voltage of the multiplier 8 is proportional to the area speed (cm /sec) of the copying paper.
  • the analogueto-digital convertor 91 converts this voltage into a pulse train whose frequency is proportional to the input voltage.
  • the number of pulses counted by the counter 10 is thus proportional to the surface area of the copying material being processed.
  • the counter 10 is switched on only during the time in which the copying paper actuates at least one of the switches S1, S2 and S3. Instead of switches S5 and S7. it is also possible for the control unit 71 to operate only one switch arranged in the connecting line between the multiplier 8 and the analogue-todigital converter 91 (see FIG. 4).
  • FIG. 4 shows afurther embodiment of the replenishing control according to the invention.
  • the leading edge of the photoprinting paper actuates switch S4 and thus causes the voltage of the voltage generator 3 which corresponds to the speed of travel to be applied to integrator 5.
  • the output of integrator 5 is directly connected with the multiplying input of the multiplier 8.
  • one of the voltages U,,,, U or U which correspond to the width of the selected copying material is applied to the other input of the multiplier 8 by way of the control unit 6.
  • a voltage U results whose magnitude is proportional to the surface area of the copying paper which passes through the apparatus.
  • the control unit 7 actuated by the trailing edge of the material, this output voltage U is applied for a constant period of time to the circuit 17, as shown in FIG. 3 and described above.
  • the voltage at the output of the amplifier 81 is proportional to the treated surface area, and this voltage is converted into counting pulses, upon actuation by the trailing edge of the material and by way of the control unit 7, by the analogue-to-digital converter de scribed in detail with reference to FIG. 3.
  • the resulting counting pulses whose number is proportional to the voltage, are added up. Since the frequency of these pulses is constant, as soon as a predetermined number has been reached, the dosing device is actuated.
  • FIG. 6 A further embodiment is shown in FIG. 6.
  • the leading edge of the photoprinting paper applies to the integrator the voltage produced by pulse generator 3, which is proportional to the speed (cm/sec) of the photoprinting paper passing through the apparatus.
  • the control unit 6 and depending on which of the switches S1, S2 or S3 is actuated, a voltage corresponding to the width of the material is produced.
  • the output voltage of the generator 5 and the reference voltage U(b), which is inversely proportionate to the width, are applied to the two inputs of conventional comparator circuit 18.
  • the comparator 18 produces a pulse by way of its start-stop-switch which resets integrator 5 to zero, i.e. the pulse restarts the sawtooth voltage.
  • the comparator 18 passes a counting pulse to the counter 10.
  • the voltages U(b) are selected such that the comparator 18 releases a pulse immediately after a fraction of the smallest surface area to be treated has passed the apparatus. If the smallest surface area to be treated is of size DIN A 4, for example, the pulse is to be related to a surface representing a fraction of the DIN A 4 formate.
  • the number of pulses for a certain surface area of paper remains nevertheless constant, because the voltage reaching the integrator is correspondingly higher, so that the comparator 18 releases pulses more frequently within a given unit of time than in the case of a lower speed of travel.
  • the integrator which in the present case is used as a sawtooth generator is this time adjusted such that, with one and the same voltage U(b), the sawtooth generated is the steeper the larger the width of the paper, at a constant voltage of the tacho alternator 3.
  • the part areas may be counted at the beginning or at the end of the sawtooth.
  • FIG. 7 illustrates a further embodiment of the invention in which the pulse train is mechanically generated.
  • Element is rotated by the photoprinting machine as a direct function of the speed at which paper is being fed through the machine.
  • Element 20 may be coupled to the drive motor or otherwise driven.
  • Three apertured discs 21, 22, and 23 are mounted on shaft 20 for rotation therewith respectively past sources of light 211, 221, and 231, so that holes 210, 220, and 230 in discs 21, 22, and 23 periodically transmit light from the light source to associated photoconducting elements 212, 222, and 232.
  • photoconducting elements 212, 222, and 232 produce pulse trains having a frequency which is directly related to the number of apertures in the associated plate. From FIG.
  • the frequency of the pulses produced by photoconductor element 222 will be roughly twice the frequency of the pulses produced by photoconductor element 212.
  • the pulse train produced by element 232 will have a frequency which is twice the frequency of the pulses produced by element 222.
  • pulse trains are applied to the three inputs of control unit 24 and the frequency of these pulse trains is proportional to the speed of travel of the photoprinting paper.
  • the switches S S and S take care that in each case only one of the three pulse trains reaches counter 10 which, as described above, actuates the dosing of a certain quantity of amine when a predetermined value is reached.
  • the three switches S S and S are connected with three AND-gates U,, U and U having four inputs each, in a manner such that the first AND-gate U, allows passage of the pulses of the phototransistor 212 only when S, is on L and S and 3,, lie on 0; that the second AND- gate U allows passage of the pulses of phototransistor 222 only when the switches S, and S are on L and switch S lies on 0; and that the third AND-gate U allows passage of the pulses of phototransistor 232 only when all the switches S,, S and 5;, lie on 0.
  • This logical circuit may be produced by two negation members, as shown in FIG. 7.
  • Photoprinting apparatus comprising an exposure station,
  • said pulse generator includes means for generating a voltage proportional to the speed of the photoprinting paper and wherein said control circuit includes a voltage source whose voltage is proportional to the width of the respective photoprinting material and which is switched on by the respective switching elements; means for applying the output of said generating means and said voltage source to the inputs of an electronic multiplier which produces an output voltage whose amplitude is proportional to the product of the numerical values of the input voltages; means for connecting the output of said multiplier to the input of an analogue-to-digital converter which generates, as its output, a number of pulses which is proportional to the input voltage, and means for connecting the output of said analogue-to-digital converter to the input of said counter.
  • said switching means includes, connected between said generating means and one of the inputs of said multiplier: a first control switch switched on by the leading edge and off by the trailing edge of said paper and wherein said control circuit includes an integrator and a second control switch means switched on for a constant period of time by the trailing edge of said paper, means connected between said voltage source and the other input of said multiplier, switched on by the trailing edge of the copying material for the same period of time for producing voltage proportional to the width of the material and applying that voltage to second input of said multiplier; an analogue-to-digital con-- verter connected to said multiplier for producing a pulse train whose frequency is proportional to its input voltage; and means connecting output of said analogueto-digital converter to said counter means.
  • Photoprinting apparatus wherein the signal at the output of said generating means is connected to one of the inputs of said multiplier by way of a first control switch which is switched on by the leading edge of the copying material and switched off by its trailing edge; that voltage of the control circuit is connected by way of a control switch wired in the same way as control switch with the other input of the multiplier, the output voltage of said multiplier being proportional to the product of the numerical values of the input voltages; and the output of the multiplier is connected with the input of said pulse generator.
  • control circuit includes a single control switch arranged between the output of said pulse generator and the input of said counter, said control switch being switched on by the leading edge of the copying material and switched off by its trailing edge.
  • the pulse generator comprises a generator which generates a voltage which is proportional to the speed of the photoprinting paper; a first control switch 1 actuated by the leading edge of the copying material for applying the speed-related signal of the generator to an electrical integrator unit which thus yields at its output a voltage which is proportional to the time integral of the time slope of the voltage at the input; a voltage generator whose voltage is inversely proportional to the width of the copying material being processed and which is switched on by a switching element relating to the respective width; means for connecting the output voltage of the integrator and the adjusted voltage at the output of the control circuit to the inputs of a comparator which releases a pulse at its output when the two voltages are identical; and means for connecting the output of the comparator with the input of said counter, and, at the same time, with the reset input of the integrator unit in a manner such that the pulse released by the comparator resets the integrator.
  • said pulse generator includes a speed-related generator connected, by way of a switch which is actuated, by the leading edge of the copying material with the input of an integrator; the output signal of the integrator being connected to one of the inputs of a multiplier whose other inputs are connected, by way of a control unit with a width-related voltage; the signal at the output of the multiplier being operated by a further control circuit responsive to one of the inputs of a comparator whose second input-is connected with the output of a sawtooth; said further control circuit being actuated by the trailing edge of the paper to start a pulse generator which passes pulses of a constant frequency to said counter means; and that, when the input volt ages are identical, the comparator releases a pulse which stops the pulse generator.
  • a speedrelated generator is connected, by way of a switch actuated through control circuit by the leading edge of the material, with an integrator the output of which is connected with the input of an amplifier; the amplifying ratio of the amplifier is adjusted in proportion to the width of the material by a control circuit actuated by the leading edge of the paper; the output voltage of the amplifier which is proportional to the surface area of the material is converted by means of an analogue-to-digital converter into a number of pulses which is proportional to the input voltage, and that these pulses are connected to the counter means.
  • Photoprinting apparatus wherein the drive of the feeding system for the copying material is provided with elements which revolve with it and which produce, with each revolution, a number of electrical pulses in the connections associated with them the ratios between the numbers of pulses being the same as the ratios between the different widths of copying material; switches actuated by the leading edge of the copying material connect the one of the connections which relates to the copying material of the selected width, to the input of a pulse counter; and the counter actuates the replenishing system as soon as a predetermined number has been reached.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Controlling Sheets Or Webs (AREA)
  • Projection-Type Copiers In General (AREA)
  • Paper (AREA)
  • Photographic Processing Devices Using Wet Methods (AREA)
  • Dry Development In Electrophotography (AREA)
  • Control Or Security For Electrophotography (AREA)
US499645A 1973-08-25 1974-08-22 Photoprinting apparatus in which developer is replenished in proportion to the treated surface area Expired - Lifetime US3905698A (en)

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DE2343067A DE2343067C3 (de) 1973-08-25 1973-08-25 Lichtpausgerät mit einer Einrichtung zum flächenproportionalen Nachdosieren von Entwicklermaterial

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JP (1) JPS5056237A (cg-RX-API-DMAC7.html)
DE (1) DE2343067C3 (cg-RX-API-DMAC7.html)
FR (1) FR2241811B3 (cg-RX-API-DMAC7.html)
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Cited By (8)

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Publication number Priority date Publication date Assignee Title
US4104670A (en) * 1977-04-08 1978-08-01 Pako Corporation Automatic replenisher control
US4134663A (en) * 1975-12-19 1979-01-16 Agfa-Gevaert Ag Method and apparatus for feeding replenishment chemicals in film processors
US4332456A (en) * 1980-07-14 1982-06-01 Pako Corporation Graphic arts processor having switch selectable replenishment control information matrices
US4480901A (en) * 1981-11-27 1984-11-06 Agfa-Gevaert Aktiengesellschaft Arrangement for and a method of processing photosensitive articles
US4945381A (en) * 1986-10-07 1990-07-31 Seiko Epson Corporation Image forming apparatus
US5280318A (en) * 1992-10-02 1994-01-18 Eastman Kodak Company Apparatus for processing photosensitive material
US5518845A (en) * 1989-02-01 1996-05-21 Eastman Kodak Company Method and apparatus for controlling the rate of replenishment of chemical solutions in photographic processing
WO2005101119A1 (en) * 2004-04-15 2005-10-27 Eastman Kodak Company Exposing photosensitive material with a sequence of images allowing optimum usage of processing solution

Families Citing this family (3)

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Publication number Priority date Publication date Assignee Title
DE2613331C2 (de) * 1976-03-29 1981-06-25 Hoechst Ag, 6230 Frankfurt Vorrichtung zur Erzeugung von ammoniakhaltigem Entwicklergas für die Entwicklungseinrichtung eines Diazo-Kopiergerätes
JPS5562470A (en) * 1978-11-02 1980-05-10 Mita Ind Co Ltd Toner replenish control device of electrostatic copier
DE3028675C2 (de) * 1980-07-29 1987-02-19 Agfa-Gevaert Ag, 5090 Leverkusen Vorrichtung zum Entwickeln von fotografischen Schichtträgern, insbesondere von Filmen

Citations (3)

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Publication number Priority date Publication date Assignee Title
US3472143A (en) * 1967-01-12 1969-10-14 Itek Corp Apparatus for processing photographic material
US3763758A (en) * 1972-09-25 1973-10-09 Logetronics Inc Control unit for minimizing water and power consumption in automatic film processors
US3852793A (en) * 1973-01-31 1974-12-03 E Mcclintock Apparatus for conserving the use of water electricity, and the like in automatic film processors

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3472143A (en) * 1967-01-12 1969-10-14 Itek Corp Apparatus for processing photographic material
US3763758A (en) * 1972-09-25 1973-10-09 Logetronics Inc Control unit for minimizing water and power consumption in automatic film processors
US3852793A (en) * 1973-01-31 1974-12-03 E Mcclintock Apparatus for conserving the use of water electricity, and the like in automatic film processors

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4134663A (en) * 1975-12-19 1979-01-16 Agfa-Gevaert Ag Method and apparatus for feeding replenishment chemicals in film processors
US4104670A (en) * 1977-04-08 1978-08-01 Pako Corporation Automatic replenisher control
US4332456A (en) * 1980-07-14 1982-06-01 Pako Corporation Graphic arts processor having switch selectable replenishment control information matrices
US4480901A (en) * 1981-11-27 1984-11-06 Agfa-Gevaert Aktiengesellschaft Arrangement for and a method of processing photosensitive articles
US4945381A (en) * 1986-10-07 1990-07-31 Seiko Epson Corporation Image forming apparatus
US5518845A (en) * 1989-02-01 1996-05-21 Eastman Kodak Company Method and apparatus for controlling the rate of replenishment of chemical solutions in photographic processing
US5280318A (en) * 1992-10-02 1994-01-18 Eastman Kodak Company Apparatus for processing photosensitive material
WO2005101119A1 (en) * 2004-04-15 2005-10-27 Eastman Kodak Company Exposing photosensitive material with a sequence of images allowing optimum usage of processing solution
US20070171435A1 (en) * 2004-04-15 2007-07-26 Eastman Kodak Company Optimum usage of processing solution in printing

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NL7410896A (nl) 1975-02-27
FR2241811A1 (cg-RX-API-DMAC7.html) 1975-03-21
DE2343067C3 (de) 1980-11-06
FR2241811B3 (cg-RX-API-DMAC7.html) 1977-06-17
DE2343067A1 (de) 1975-02-27
DE2343067B2 (de) 1977-03-03
JPS5056237A (cg-RX-API-DMAC7.html) 1975-05-16
GB1481062A (en) 1977-07-27

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