EP0390876B1 - Durchlauf-entwicklungsgerät - Google Patents

Durchlauf-entwicklungsgerät Download PDF

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Publication number
EP0390876B1
EP0390876B1 EP89902198A EP89902198A EP0390876B1 EP 0390876 B1 EP0390876 B1 EP 0390876B1 EP 89902198 A EP89902198 A EP 89902198A EP 89902198 A EP89902198 A EP 89902198A EP 0390876 B1 EP0390876 B1 EP 0390876B1
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EP
European Patent Office
Prior art keywords
flooding
troughs
treatment
treatment chamber
trough
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
EP89902198A
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German (de)
English (en)
French (fr)
Other versions
EP0390876A1 (de
Inventor
Siegfried Haag
Joachim Korn
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.)
Duerr Dental SE
Original Assignee
Duerr Dental SE
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Duerr Dental SE filed Critical Duerr Dental SE
Priority to AT89902198T priority Critical patent/ATE67321T1/de
Publication of EP0390876A1 publication Critical patent/EP0390876A1/de
Application granted granted Critical
Publication of EP0390876B1 publication Critical patent/EP0390876B1/de
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
    • 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
    • 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
    • G03D3/08—Liquid processing apparatus involving immersion; Washing apparatus involving immersion having progressive mechanical movement of exposed material
    • G03D3/13—Liquid processing apparatus involving immersion; Washing apparatus involving immersion having progressive mechanical movement of exposed material for long films or prints in the shape of strips, e.g. fed by roller assembly
    • G03D3/132—Liquid processing apparatus involving immersion; Washing apparatus involving immersion having progressive mechanical movement of exposed material for long films or prints in the shape of strips, e.g. fed by roller assembly fed by roller assembly

Definitions

  • the invention relates to a continuous processing device for photographic films, in particular X-ray films, according to the preamble of claim 1.
  • the present invention is intended to develop a development device according to the preamble of claim 1 in such a way that, even when the device is at a standstill for a long time, there are no salt crusts on the conveying means which serve to move the development material through the treatment chambers.
  • a flood tank is additionally arranged under at least one treatment chamber. This releases the input gap and the output gap of the assigned treatment chamber in a standby position set when the device is working, so that there the same working conditions are present as in the known development device described at the outset, with the only difference that treatment liquid overflowing through the treatment chamber does not drip directly back into the outer tank Rather, it first reaches the flood tank and then overflows from the latter into the outer tank. This difference is irrelevant as far as the liquid treatment of the development material is concerned.
  • the overflow edge of the flood trough lies over all the conveying means of the assigned treatment chamber.
  • the conveying means are thus completely immersed in the treatment liquid, and can therefore remain on them even after a very long standstill state of the developing device does not form salt crusts. Since the trough is usually filled with treatment liquid at the beginning of the lifting process and part of this liquid is displaced by the funding and the other parts of the treatment chamber when the trough is lifted, a sufficiently high liquid level is always guaranteed, even if the circulation pump already is switched off at the beginning of the lifting process.
  • US Pat. No. 3,624,728 shows an automatic development device with a vertically movable tank arrangement. This ensures that the chemicals can be easily replaced without having to intervene in the conveyor mechanism.
  • US-PS 3587429 a developing device is shown which has a deformable tank bottom. By deforming this bottom, the treatment liquid can optionally be lifted onto the conveying path of the development material.
  • US-PS 3093051 a liquid application station is described, in which two trays containing different treatment liquids can optionally be placed in the conveying path of the material to be treated, for which purpose a parallelogram linkage is used in connection with a crank drive.
  • the movement of a tank is used to selectively bring a treatment liquid to the delivery level of the material to be treated.
  • the aim is not to completely immerse conveyor devices of a dynamically sealed treatment chamber in a volume of treatment liquid when the development device is at a standstill.
  • the tank itself is moved, while in the device according to the invention the outer tank is just as fixed as in the known development device described in the introduction according to US Pat. No. 4,023,190.
  • the development device according to the invention is raised and lowered an additionally provided trough, as is found in none of the known devices recognized above.
  • the liquid stream overflowing from the flood troughs flows back into the outer tank in each case without hitting the free surface of the liquid located in the associated outer tank.
  • a plurality of successive flood troughs in the conveying direction can be raised and lowered by a common lifting device, which reduces both the mechanical outlay and the circuitry outlay.
  • a partition wall separating successive outer tanks can be pulled up particularly far, which is advantageous in view of the good partitioning of these outer tanks from one another.
  • the drive motor of the lifting device only needs to apply a small residual force.
  • This drive therefore does not have to be designed for high performance;
  • he can quickly move the troughs between their two positions, so that the operational state of the device is reached particularly quickly. Since the total weight of the trough and the treatment liquid located in it decreases when lifted by overflowing treatment liquid, but the force of the spring arrangement also decreases with the lifting movement, a residual force that is almost independent of the distance traveled can be achieved overall.
  • the coil springs and the lifting rods do not have to be made of a corrosion-resistant material.
  • the guide device for the lifting rods does not have to perform a sealing function at the same time, so that this guide device can be designed to be particularly easy to move, e.g. can give the lifting rods cross-shaped cross-sectional geometry.
  • the flood tanks can be quickly and easily lifted out of the outer tanks, e.g. then, when liquid still in them has to be emptied in order to completely exchange the treatment liquids.
  • the treatment liquids are introduced uniformly distributed into the treatment chambers, at such a point that the entire treatment chamber is flowed through.
  • the feed part supplying the treatment liquid has small dimensions, in addition, the sealing point at the inlet end of the feed part is close to that device area which is anyway specially designed for the return of treatment liquid, so that the Tightness there are no very great requirements.
  • connection between the feed part and the housing-fixed discharge opening for the treatment liquid is automatically established with the vertical insertion and can be interrupted with the vertical removal of the troughs.
  • the cantilevered portion of the food section is short in the vertical direction, that is, when pressed against the housing-fixed discharge opening is only exposed to slight bending loads.
  • the development of the invention according to claim 19 is advantageous with regard to a controlled immediate return of leaked liquid emerging at the sealing point between the feed part and the discharge opening fixed to the housing into the assigned external tank of the device.
  • the development of the invention according to claim 20 serves the uniformity of the delivery of fresh treatment liquid to the interior of the treatment chamber under consideration.
  • the development of the invention according to claim 21 is advantageous in terms of simple manufacture of the entire lower region of a treatment chamber, which is not sealed by conveyor rollers, also with regard to simple assembly and replacement of this region and with regard to simple cleaning of this region and on both sides Accessibility of the conveyor rollers for periodic thorough cleaning.
  • the development of the invention according to claim 24 serves for the simple manufacture of the base part and sealing lips in a single injection process.
  • a lifting device as specified in claim 25, produces a large stroke of the flood tanks with compact overall dimensions. Due to the crank characteristics, the upper and lower end positions of the flood troughs are still well maintained when the drive motor of the lifting device is controlled by end position sensors which do not respond very precisely.
  • the total power transmission between the drive motor and flood tanks is independent of the travel distance covered.
  • the troughs are automatically lowered when introducing development material into the development device if they were previously in their raised flood position. Furthermore, after a development process has ended, the flood tanks are automatically moved from the lower standby position to the entire funding flooding flood position raised.
  • the catchment area accepts development material even if the conveying path is still blocked by a raised trough at a point further back in the device. The user therefore does not have to wait until the device is fully operational and can immediately turn to another activity. He also does not get the impression that the device is not ready for operation.
  • the remaining amounts of treatment liquid in the flood tanks can be emptied to the associated external tank, so that the flood tanks do not have to be removed from the device to completely renew the treatment liquids.
  • the development of the invention is advantageous with regard to particularly simple actuation of the drain valves of the flood tanks, in particular servo actuation using the drive of the lifting device.
  • FIG 1 designates a housing for a continuous development device. This gives an entrance room 12, which is delimited by a front end wall 14 and a rear first intermediate wall 16 as well as the left side wall 18 and the right side wall 20 and a projecting wall 22.
  • details such as “front”, “rear”, “left” and “right” relate to the direction of conveyance of the development material passing through the development device, that is to say to an observer position at the input end of the development device.
  • a developer tank space 30 is delimited by a front end wall 24, a second intermediate wall 26 and the side walls 18 and 20 and a bottom wall 28 of the housing 10.
  • a washing tank space 36 is defined by a third intermediate wall 38, a fourth intermediate wall lying downstream thereof, not shown in the drawing, the side walls 18 and 20 and a raised bottom wall 40 of the housing 10.
  • feed rack designated as a whole with 42, with feed roller pairs 44, 46.
  • a light barrier 48 working in reflection then generates an output signal when film material to be developed is immediately below it, ie shortly before the one specified by the roller pair 44 Feed gap of the device is located.
  • roller pairs 44, 46 are mounted in side plates 50, 52 which are firmly connected to one another by rods 54.
  • two side plates 56, 58 which are also connected by rods 54, form the supporting structure for a double rack which can be handled in one piece, the portion of which is assigned to the developer area in the drawing as a whole is designated by 60 and its section assigned to the fixer is designated overall by 62.
  • the developer rack 60 includes four roller pairs 64 to 70, which are arranged essentially symmetrically to the rack transverse center plane and which in the developer area specify a curved conveying path section for the development material.
  • a single guide roller 72 is arranged between the roller pairs 66 and 68, which guides the development material to the roller pair 68 at the lowest point of the conveying path.
  • a bottom part 74 is detachably attached in the developer area using a bayonet connection, which will be described in more detail later with reference to FIG. 4.
  • the bottom part 74 is a hollow molded part with a central distribution chamber 76 which communicates with the interior of the developer rack 60 via a plurality of uniformly distributed openings 78.
  • two feed channels 80, 82 for the developer liquid extend perpendicular to the drawing plane of FIG. 1 and are connected to the distribution chamber 76 via openings 84. Details of the supply of the developer liquid to the supply channels 80, 82 will also be described in more detail later with reference to FIGS. 3 and 4.
  • sealing lips 86, 88 are injection molded perpendicular to the plane of the drawing in FIG.
  • the latter consist of an elastically resilient soft plastic material and are molded directly onto the bottom part 74.
  • the sealing lips 86, 88 stand vertically on the surface of the bottom part 74.
  • the sealing lips 86, 88 lie in the manner shown in FIG. 1 under bending prestress on the outer surface of the lower roller 90 of the pair of rollers 64 and 64, respectively the lower Roller 92 of the roller pair 70 on.
  • the roller pairs 64 and 70 - like the other rollers of the developing device - consist of a hard core 94 and an elastically resilient support 98.
  • the center distance of the rollers of a roller pair is chosen so that the peripheral surfaces of these rollers lie close together.
  • the front and rear end faces of the supports 98 are brought directly to the side plates 56, 58 and run on them with sliding friction.
  • a washer made of low-friction material can be inserted between the end of the support 98 and the adjacent side plate.
  • roller pairs 64 and 70 thus, together with the sealing lips 86, 88 and the bottom part 74 supporting the latter, form a substantially liquid-tight developer chamber 100.
  • Dynamic sealing points formed emerge only small liquid leakage flows, which are negligible compared to the flow of developer liquid supplied to the feed channels 80, 82.
  • An overflow opening 102 is provided in the side plate 56, the lower edge of which specifies the working level of the developer liquid so that the developer liquid continuously supplied by circulating pumps in stationary work operation does not flow out via the upper rollers of the roller pairs 64, 70 located at the ends of the developer chamber 100.
  • This level is obviously above the input gap of the developer chamber 100 specified by the pair of rollers 64, and above the output gap specified by the pair of rollers 70 the developer chamber 100 and over all intermediate areas of the conveying path of the development material. The latter thus comes into good contact with developer liquid from both surfaces.
  • the fixer rack 62 is constructed very similarly to the developer rack 60 just described in detail. Pairs of rollers 104, 106, 108 provide a straight conveying path in the developer area.
  • a bottom part 110 connected to the side plates 56, 58 via a bayonet connection has a central distribution chamber 112, which communicates via openings 114 with the interior of the fixer rack 62, and lateral feed channels 116, 118, via openings 120 with the distribution chamber 112 stay in contact.
  • Resiliently flexible sealing lips 122, 124 are again injection molded onto the ends of the base part 110 and cooperate with the lower roller 126 of the roller pair 104 or the lower roller 128 of the roller pair 108.
  • roller pairs 104 and 108 together with the sealing lips 122 and 124 and the bottom part 110 again form an essentially liquid-tight treatment chamber, namely the developer chamber 130.
  • An overflow opening 132 in the side plate 56 again specifies the working level of the developer liquid so that the development material is released its entire path through the developer chamber 130 is flushed on both sides with developer liquid.
  • a washing rack 134 is inserted into the washing tank chamber 36.
  • a double flood pan 142 is arranged below the developer rack 60 and the fixer rack 62. This consists of a developer trough 144 and a fixer trough 146, which are held together by a common partition 148.
  • the cross-sectional contour of the two flood tanks 144 and 146 is selected such that the different wall sections of the flood tanks surround the developer rack 60 or the fixer rack 62 with a small distance when the double flood tank 142 is in a raised flood position, which in Figure 1 is shown in full.
  • the bottom of the double flood trough 142 is provided in the region of the intermediate wall 148 with a recess 149 into which the intermediate wall 26 can enter when the double flood trough 142 moves out of its roller-flood position shown in FIG. 1 into a position shown in FIG. 1 standby position shown in dashed lines is lowered.
  • the front and rear end walls of the double flood trough 142 lie below the path of the material to be developed, which is predetermined by the conveyor rollers, and thus release them.
  • the tub end walls block this path and maintain such a high liquid level in the developer rack 60 and in the fixer rack 62 regardless of the fact that developer chamber 100 and fixer chamber 130 are only dynamically sealed, i.e.
  • the double flood trough 142 has lateral support arms 150, 152 with which it is attached to the upper ends of two lifting rods 154, 156 is, for example, using a nut 158 which is screwed onto a threaded end section 160 of the lifting rod under consideration, which end is threaded through the support arm in question.
  • the lifting rods 154, 156 have a cross-shaped transverse cross section and run in guide bushes 162, 164, which are also molded into the housing 10.
  • the upper ends of the lifting rods 154, 156 are surrounded by coil springs 166, the lower end of which is supported on a horizontal intermediate wall 168 of the housing 10 and the upper end of which engages on the underside of the support arms 150, 152.
  • the coil springs 166 are in turn surrounded by bellows 170, the upper end of which is tightly connected to the associated support arm 150 or 152 and the lower end of which is tightly connected to the horizontal intermediate wall 168.
  • the lower ends of the lifting rods 154, 156 are connected to the driving end of a connecting rod 176 and 178 via connecting rods 172, 174. Its driven end is articulated on a crank pin 180 or 182, which is carried by a crank disk 184 or 186.
  • crank disks 184, 186 are rotationally connected by a shaft 188, which runs in bearing eyes 200 molded onto the bottom wall 28.
  • crank disk 186 is provided with a ring gear and meshes with a free-running gear wheel 202, on which the pinion 204 of a synchronous motor 206 works.
  • the synchronous motor 206 is screwed to a retracted housing shoulder 208 and to the bottom wall 28 formed on the side edges of two standing ribs 210, 212, which on the one hand allow unobstructed drainage of the crank disks 184, 186 and on the other hand the laying of hoses and cables on the underside of the device.
  • Drawn-in areas 214, 216 of the side walls 18, 20 of the housing 10 receive an upper section of the crank disks 184, 186 and allow the connecting rods 176 and 178 to be pivoted out laterally. As can also be seen from FIG.
  • a larger compartment 218 remains under the washing space 36 , in which pumps for circulating the various working fluids, for the dosed feeding of chemicals and heating devices for the treatment fluids can be accommodated.
  • four hoses are also shown laid between the standing ribs 210, 212, namely a developer return hose 222 connected to a developer drainage connection 220, a developer supply hose 226 connected to a developer feed connection 224 of the housing 10, one with a fixer -Filler connector 228 connected fixer return hose 230 and a fixer supply hose 234 connected to a fixer feed connector 232 of the housing 10.
  • cables 238, 240, 242 are led into the hose and cable channel delimited by the standing ribs 210, 212 via an opening 236 in the standing rib 210, said cable channel being provided with light barriers 244, 246 or the synchronous motor operating in reflection 206 are connected.
  • the light barrier 244 represents a sensor for the upper end position of the double flood trough 142. When the double flood trough is fully raised, it is opposed by a mirror 248 carried by the crank disk 186.
  • the light barrier 246 is a sensor for the lower end position of the double flood tank 142 and works with a second one mirror 250 carried by the crank disk 186, which faces the light barrier 246 when the crank pins 180, 182 have reached their bottom dead center.
  • the light barriers 244, 246 together with the light barrier 48 serve to control the raising and lowering of the double flood tank 142, as will be explained in more detail later with reference to FIG. 8.
  • the flood tanks 144 and 146 are provided with an overflow recess 252 and 254, respectively. Treatment liquid displaced from the interior of the flood tanks therefore only flows out of the flood tanks at a precisely predetermined location in the vicinity of the center of the developer area or the fixer area. In the vertical direction, aligned with the overflow recesses 252, 254, the flood tanks 144 and 146 are provided with drip strips 256, 258 which hang downward. Their height is such that the lower end of the drip strips 256 and 258 are still immersed in the liquid even at the lowest still permissible liquid level in the developer tank space 30 or fixer tank space 34. In this way, treatment liquid that has been displaced from the interior of the troughs reaches the tank space below without splashing in a laminar, well-defined liquid flow.
  • a transverse support rib 260 is formed on the bottom of the flood pan 146, the height of which corresponds to the height of the drip strip 258.
  • the housing 10 for accommodating the synchronous motor 206 can also be drawn in there.
  • the side plates 56, 58 carry four support pins 262, on which a cover 264 and a cover 266 lie. These lids engage with little play between the side plates 56, 58 and the transverse walls of the troughs 144, 146.
  • the position of the support pins 262 is selected so that the underside of the cover 264, 266 is flush with the lower edge of the overflow recesses 252, 254 which specifies the height of the liquid level in the flood position.
  • the developer and fixer liquid are supplied to the bottom parts 74 and 110 using feed parts 268, 270 placed on the outside of the side plate 56. These have a front part in FIGS. vertically downward inlet section 272, 274, as well as a discharge section 276 immediately adjacent to the side plate 56 and also downward.
  • the lower end of the inlet sections 272, 274 is provided with a flange 280 or 282, which is fitted tightly onto the top of the horizontal intermediate wall 168 using a sealing ring 284 or 286.
  • the inlet portion 274 of the feed portion 270 communicates with a fixer feed channel 290 that comes from the fixer feed port 232.
  • the lower end of the dispensing section 276 of the feed part 268 is connected to two branch channels 292 running in the longitudinal direction of the side plate 56, the ends of which are connected via openings 296 of the side plate 56 to the feed channels 80, 82 of the base part 74.
  • bayonet grooves 298 are provided in the lower end of the side plate 56 and analogously in the lower end of the side plate 58, in which bayonet pins 300 carried by the end walls of the base part 74 run.
  • the liquid supply and the fastening of the base part takes place in the case of the fixer rack 62 in the same way as described for the developer rack 60.
  • FIGS. 5 and 6 show a modified base part 302 with elastically deformable sealing lips 304, 306 molded onto the front and rear ends, which are represented by solid lines in the unloaded state and by dashed lines in the installed state. Also shown in dashed lines in FIG. 5 are the lower rolls of pairs of rolls which cooperate with the sealing lips 304, 306.
  • the bottom part 302 has a single feed opening 308 which is connected to a U-shaped distribution channel 310 when viewed from above. The latter releases the treatment liquid through a plurality of openings 312.
  • the end walls of the base part 302 carry bayonet pins 314, which cooperate with corresponding bayonet grooves in the side plates 56, 58.
  • the movement to be carried out for inserting the base part 302 into the side plates 56, 58 is indicated in FIG. 5 by a vertical arrow 316 and a horizontal arrow 318 adjoining it.
  • the horizontal arrow 318 is so long that the sealing lips 304, 306 when performing the vertical Do not hit arrow 116 with the specified movement on the rollers that will later cooperate with the sealing lips. It is only when the second movement represented by the horizontal arrow 318 is carried out that the sealing lips 304, 306 come into contact with the associated rollers, wherein they are elastically stressed to bend.
  • the output of the light barrier 246, which represents a lower end position sensor for the flood tanks, is connected via an inverter 320 to a first input of an AND gate 322.
  • the latter receives at its second input the output signal of the light barrier 48, which responds to the presence of film material to be developed in front of the device's feed gap. A signal is thus obtained at the output of the AND gate 322 when film material is to be developed, but the two flood pans are not in their lower end position, that is to say they still block the conveying path.
  • the output signal of the AND gate 322 is applied to the down control terminal of a control circuit 324 for the synchronous motor 206.
  • the control circuit 324 sets the synchronous motor 206 in such a direction of rotation that the crank disc 184 runs counterclockwise. This movement is ended when the lower end position sensor formed by the light barrier 246 generates an output signal.
  • the output signal of the AND gate 322 also reaches a slow control terminal of a control circuit 326 for a drive motor 328 of the conveyor, which drives the various rollers of the various racks of the developing device synchronously via power transmissions (gear trains, toothed belts or the like) which are not shown in the figures.
  • the control circuit 326 causes the drive motor 328 to run at such a speed that the rollers are driven just so fast that the leading edge of the film piece input for development passes just over the intermediate wall 16 when the upper edge of the front wall of the developer Flood tank 144 has released access to the developer slot 60's nip predetermined by the roller pair 64.
  • the corresponding fraction of the full working speed of the drive motor 328 is indicated at the control terminal of the control circuit 326 with "x%".
  • the second, full working speed of the drive motor 328 causing "100%" control terminal of the control circuit 326 is supplied with a signal when there is development material behind the partition 16 in the development device.
  • an OR gate 330 is connected upstream of this control terminal. Its input is connected to the output of an AND gate 332, the inputs of which receive the output signal of the light barrier 246 and the output signal of the light barrier 48.
  • the full working speed of the drive motor 328 is thus always set when the double flood tank 142 is fully lowered and the light barrier 48 is opposed to film material still to be developed.
  • a monostable multivibrator 334 triggering on falling edges is also connected to the output of the light barrier 48, the output of which is connected to the second input of the OR gate 330.
  • the period of the monostable flip-flop 334 is chosen to be somewhat longer than the period of time that the trailing edge of the piece of film leaving the light barrier 48 still needs to be around the developing device to go through completely.
  • the upward control terminal of the control circuit 324 is preceded by a NAND gate 336, the inputs of which are connected to the output of the AND gate 322, the light barrier 244 and the OR gate 330.
  • the double flood pan 142 is thus only raised when there is no more development material in the entire development device and no new film piece is introduced into the development device.
  • a temperature sensor for the temperature of the developer liquid is shown at 338, which can be arranged in the developer tank 60 or at another point in the circuit of the developer liquid.
  • the temperature sensor 338 is connected to one input of a comparator 340, the second input of which is acted upon by a setpoint temperature sensor shown as an adjustable resistor 342. If the measured temperature is below the target temperature, the comparator 340 controls a control circuit 344, via which a heating resistor 346 is supplied with energy.
  • the heating resistor 346 sits on a heat-conducting plate 348, on the ends of which two pipe sections 350, 352 are welded. The latter are connected to the outlet openings of two circulation pumps 354, 356, which draw developer liquid or fixer liquid out of the corresponding tank spaces of the housing 10 via the return hoses 222, 230 and press them into the supply hoses 226 and 234.
  • the circulation pumps 354 and 356 are driven by a common pump motor 358, for which a control circuit 360 is provided.
  • the input terminal of the control circuit 360 is connected to the output of an OR gate 362, the inputs of which are connected to the output of the OR gate 330, the output of the AND gate 322, the output of the comparator 340 and the output a monostable multivibrator 364 are connected.
  • the monostable flip-flop 364 ensures that the pump motor 358 continues to run for so long that the heat stored in the heating device formed by the components 348 to 352 is safely released to the treatment liquids, so that there is no overheating in the latter Heater of standing liquid components takes place.
  • the return hoses 222 and 230 are connected to the sewage system via valves, not shown, and the treatment liquids remaining in the tank rooms flow there. Then the developer rack 60 and the fixer rack 62 are lifted up together (when the device is switched off, that is to say the double flood tank 142 is raised). With the dipping of the racks, the liquid level in the flood tanks 144 and 146 drops considerably, so that when Removing and lifting the troughs, even larger unintentional tipping, does not lead to an overflow of treatment liquid.
  • the double flood pan 142 which then typically still contains a 3/4 liter of the corresponding treatment liquid, can then be carried to a spout and emptied there and cleaned with running water.
  • the return hoses 222 and 230 are then separated from the sewage system again by switching the corresponding valves, and a supply of 5 liters of developer liquid and fixer liquid can be obtained , which is sufficient for working for another four weeks, simply pour from above into the developer unit or the fuser unit.
  • the larger proportion of the treatment liquids that cannot be retained by the flood tanks 144 and 146 then flows via the overflow recesses 252, 254 into the tank rooms below. After this chemical exchange, the rollers of the developer unit and the fuser unit are protected against the formation of salt crusts even without the developer being switched on again.
  • FIGS. 9 and 10 show two correspondingly modified developer flood troughs 144. Drain valves of similar design are provided on the fixer flood trough 146, which is not shown in FIGS. 8 and 9.
  • the bottom is designed to drop slightly towards the center. and a drain opening 366 is provided at this deepest floor location.
  • the latter is covered by a valve body 368, which carries an elastic sealing disk 370.
  • valve body 368 is seated at the free end of a rocker arm 372, which is supported via a pivot pin 374 in a bearing eye 376 formed on the bottom of the flood pan 144 at the bottom.
  • the second end of the rocker arm 372 is formed with a spring seat plate 378.
  • a helical compression spring 380 is inserted between the top of the spring seat plate 378 and the bottom of the bottom of the flood pan 144. The latter holds the valve body 368 in the position closing the drain openings 366.
  • the housing 10 carries a stop 382 vertically aligned with the spring seat plate 378, which is shown in broken lines in FIG. This stop is arranged in such a way that it is reached by the spring seat plate 378 either shortly before the ready position of the flood pan 144 is reached or only after it has been moved over this ready position.
  • valve body 368 is forcibly opened with each lowering of the flood pan 144, so that the flood pan 144 acts as a funnel in the ready position.
  • the overflow recess 252 then only becomes active in the raised flood position of the flood pan 144.
  • the pump motor 358 must still be run even when the flood tanks are raised, so that the flood tanks, which now contain only little liquid, are filled with treatment liquid.
  • the stop 382 is so deep that it is in the lower standby position, which releases the conveying path Flood pans are not yet reached, so one must choose the working stroke of the lifting device somewhat larger than the vertical distance between the flood position and the ready position of the flood pans 144, 146.
  • the light barrier responsive to the reaching of the ready position and the mirror 250 cooperating with it remain arranged such that the synchronous motor 206 is switched off when the ready position is reached. In this position, however, the crank pins 180 and 182 have not yet reached their bottom dead center.
  • the spring seat plate 378 can move against the stop 382 and thus lift the valve body 368 from the drain opening 366.
  • the contents of the flood tanks 144, 146 then flow into the tank space below and from there into the sewage system.
  • the drain opening 366 is provided at the lower end of the left side wall of the developer flood pan 144.
  • the bearing eye 376, the rocker arm 372, the helical compression spring 380 and the spring seat plate 378 are also arranged in front of this side wall.
  • the end lying at the top in FIG. 10 is provided with an actuating plate 386 which is easily accessible from above.
  • FIG. 10 shows a vertical section through a modified developer unit along its transverse median plane.
  • the outer, downwardly leading inlet section 272 has been omitted, and an inlet opening has been machined directly into the lower wall of the projecting section.
  • This inlet opening is conical Wall formed and sits directly on a correspondingly tapered end of the developer feed nozzle 224. The latter is seated in a sloping shoulder 388 of the left side wall 18 adjacent to the overflow recess 252.
  • the flood level predetermined by the overflow recess 252 is also designated by F and the working level set by the overflow opening 102 when the device is operating is designated by A.
  • the crowned lower ends of the lifting rods 154, 156 run on wedge bodies 390. These have a thread in their lower section, which runs on a threaded spindle 392 in each case.
  • the threaded spindle 392 is driven by a synchronous motor 206 via a gear 394 and the pinion 204.
  • a chain drive 396 is used to couple the two threaded spindles.
  • the coil springs 166 must be chosen so weak that the flood troughs themselves sink under their own weight and the weight of the liquid volumes contained in them.
  • the wedge surface of the wedge bodies 390 must be replaced by a correspondingly inclined cam groove of a cam plate running on the threaded spindle 392, in which a cam pin which replaces the connecting rod pin 172 then runs.
  • the lower end of the lifting rods 154, 156 is designed as a threaded spindle 398.
  • This cooperates with an axially fixed, rotatable threaded sleeve 400, which is mounted in a bearing block 402 of the housing 10 and carries a ring gear 404 which meshes with the free-running gear wheel 202, which is driven by the pinion 204 from the synchronous motor 206.
  • For coupling the two threaded sleeves 400 again serves the chain drive 396.
  • the vertical adjustment of the double flood tank 142 can also be carried out directly by two hydraulic cylinders, the working spaces of which are connected in series and which are thus hydraulically synchronized.
  • lever linkage e.g. Paralellogram rods are suitable for raising and lowering the double flood tank in parallel.
  • the light barriers 244 and 246 are replaced by end position sensors that work directly with the flood tanks, e.g. Inductive proximity switches.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Photographic Processing Devices Using Wet Methods (AREA)
  • Photographic Developing Apparatuses (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
EP89902198A 1987-12-07 1988-12-03 Durchlauf-entwicklungsgerät Expired - Lifetime EP0390876B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89902198T ATE67321T1 (de) 1987-12-07 1988-12-03 Durchlauf-entwicklungsgeraet.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3741376A DE3741376C2 (de) 1987-12-07 1987-12-07 Durchlauf-Entwicklungsgerät
DE3741376 1987-12-07

Publications (2)

Publication Number Publication Date
EP0390876A1 EP0390876A1 (de) 1990-10-10
EP0390876B1 true EP0390876B1 (de) 1991-09-11

Family

ID=6342016

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89902198A Expired - Lifetime EP0390876B1 (de) 1987-12-07 1988-12-03 Durchlauf-entwicklungsgerät

Country Status (8)

Country Link
US (1) US5140355A (fi)
EP (1) EP0390876B1 (fi)
JP (1) JP2641579B2 (fi)
AT (1) ATE67321T1 (fi)
CA (1) CA1306135C (fi)
DE (2) DE3741376C2 (fi)
FI (1) FI91811C (fi)
WO (1) WO1989005479A1 (fi)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0789276A1 (en) * 1996-02-08 1997-08-13 Agfa-Gevaert N.V. Apparatus for the processing of photographic sheet material
DE19724034C2 (de) * 1997-06-06 2001-02-01 Agfa Gevaert Ag Vorrichtung zum Behandeln von fotografischen Einzelblatt-Schichtträgern
EP0895126A1 (en) * 1997-07-28 1999-02-03 Agfa-Gevaert N.V. Vessel for the wet processing of photographic sheet material
US20060249178A1 (en) * 2005-05-05 2006-11-09 Vectis Technologies Inc. Printing plate processor
US8534937B2 (en) * 2009-10-19 2013-09-17 Eastman Kodak Company Plate developer with a configurable transport path

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3093051A (en) * 1958-08-14 1963-06-11 Ritzerfeld Wilhelm Apparatus for treating printing foils
US3057282A (en) * 1959-04-06 1962-10-09 Eastman Kodak Co Fluid treating device for sheet or strip materials
GB1216477A (en) * 1967-11-20 1970-12-23 Charles William Clark Photographic apparatus
US3587429A (en) * 1968-11-06 1971-06-28 Eastman Kodak Co Integral processing tray and liquid container
GB1495745A (en) * 1975-05-22 1977-12-21 Kodak Ltd Liquid containers
US4023190A (en) * 1975-06-02 1977-05-10 Sybron Corporation Film processor
DE2633145A1 (de) * 1976-07-23 1978-06-08 Agfa Gevaert Ag Vorrichtung zur nassbehandlung fotografischer schichttraeger
DE2731045A1 (de) * 1977-07-08 1979-01-25 Agfa Gevaert Ag Vorrichtung zur nassbehandlung fotografischer schichttraeger
DE3345084C2 (de) * 1983-12-13 1985-10-10 Agfa-Gevaert Ag, 5090 Leverkusen Entwicklungsvorrichtung für horizontal geführte Schichtträger
US4758857A (en) * 1986-04-03 1988-07-19 Nix Company, Ltd. Automatic film developing machine

Also Published As

Publication number Publication date
WO1989005479A1 (en) 1989-06-15
FI91811C (fi) 1994-08-10
DE3741376C2 (de) 1996-09-05
CA1306135C (en) 1992-08-11
US5140355A (en) 1992-08-18
DE3741376A1 (de) 1989-06-15
ATE67321T1 (de) 1991-09-15
JP2641579B2 (ja) 1997-08-13
FI91811B (fi) 1994-04-29
JPH03501536A (ja) 1991-04-04
EP0390876A1 (de) 1990-10-10
DE3864834D1 (de) 1991-10-17
FI902563A0 (fi) 1990-05-23

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