DE2207137A1 - PLANT FOR THE DEVELOPMENT OF PHOTOGRAPHIC MATERIAL - Google Patents

Description

DiPL-ING. GRÄMKOW DR. MÖLLER-BORE

DlPL-PHYS. DR. MANITZ DIPL-CHEM. DR. DEUFEL DIPL-ING. Fl NSTERWALD

PATENT LAWYERS "- ^ ^ _{n / n}

Seelbergstrasse 23/25

7 STUTTGART 50 (BAD CANNSTATT) ΜβΒΧΙ »35ΒΑ8« ΚΧ

Gr / Rö 3/4

February 15, 1972

Applicant:

Werner Merz, 79H ObereIchingen, Napoleonweg 3

"Plant for developing photographic material"

The invention relates to a system for developing photographic material, in particular color development, with a developing device that receives the material to be developed and to which the chemicals required for development be forwarded.

The invention is based on the object of a plant. create that with simple operation and high performance enables particularly efficient work.

In particular, it is essential for the flawless, high-quality development of photographic material, especially for Production of color photographs, a precise measurement of the quantities of the various chemicals used for development are of great importance. The usual measures provided for this guarantee this Accuracy not or require a circumstance-like handling

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The invention avoids these disadvantages. Accordingly, it consists in an essential part of the fact that a metering device for the amount to be delivered to the processor Chemical is provided and the metering device means for setting the preselectable to be metered Has amount and means for automatic dosing of the preselected amount.

According to a further feature of the invention, the metering device has for automatic metering of the chemicals to be used one or more vessel-like dosing heads containing the chemicals to be dosed into the same arranged sensors of an electrical circuit system that protrude differently downwards and can be switched on as required on, in such a way that the inflow of the chemical liquid when reaching a through the respectively preselected A sensor determines the liquid level, e.g. by switching off a feed pump that drives the chemicals Electric motor, is interrupted. As soon as the liquid level is one or the other, a contact for one has reached the sensor forming the electrical circuit, e.g. a circuit is closed which is in a suitable Way prevents the further influx of the chemical in question.

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_ 25 -

In particular to prevent the formation of drops, the electrodes surrounding the current-conducting electrodes can be insulated Sensor tubes be beveled at their ends. It is also advantageous, in particular to form a faulty circuit preventing air bubble, the insulation in the sensor tubes surrounding the conductive electrodes set back towards the lower open end of the same.

One of the sensors against the supply pipes for the chemicals shielding calming wall, which divides the interior of the dosing head, can be provided to prevent premature or to prevent interrupted response of the sensors as a result of liquid waves inside the dosing head. That Rinsing water intended for the metering device is preferably fed to the feed pipes for the chemicals at their outlet openings fed into the dosing head (s) for washing out the outlet mouths to remove drops or residues to remove the same. For this purpose, the rinsing water for rinsing the outlet openings of several chemicals supply pipes in one upstream of the outlet openings, above them, e.g. in a cover part of the Dosing head, arranged collecting space are passed.

To further increase the economic efficiency of the plant and the development processes is according to a further feature of Invention a common system for flushing both the developing device and the metering device is provided. This allows with relatively little structural

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Effort to rinse both devices clean, so that no undesired after the individual development processes Mixing of the chemicals take place and the dosage is falsified by dripping or the like. avoided will. In addition, residues can be found in the supply lines as well as within the chemical-absorbing areas of the processor be removed cleanly.

Since there is a risk that the developing device The development chamber containing the chemicals or the rinse water accumulates by clogging the drain, is a safety device according to a further feature of the invention provided, which when a certain liquid level is exceeded in the development chamber or increased drainage if the outflow of rinsing water or the chemical mixture is obstructed causes and / or the inflow of the rinsing water or possibly the chemical mixture to the development chamber or to the developing device completely or partially interrupted. For this purpose, a drainage pump can be provided which for additional drainage in operation or in increased operation. Simultaneously with the increased drainage or with the interruption of the flow to the developing device or when a maximum permissible is reached A warning signal, e.g. of an optical or acoustic type, can be activated at the liquid level. A constantly changing Switching on and off in the area of the regulated

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Avoiding levels becomes expedient the full or partial Disabling the drainage pump and / or reopening the inflow only after the Liquid level causes below a level which is below that at which the drainage pump is in operation or increased operation is set or the inflow is interrupted.

For controlling the outflow or inflow to and from the developing device can be one or more, protruding at different depths into a Plüssigkeltssammelraum electrical circuit system can be provided over the liquid-controlling sensor, in particular such that the effect or increased effect of the drainage pump or, if necessary, the interruption of the inflow only in the event of a drop the liquid level is canceled below the lowest probe.

Dosing device and chemical tanks and / or developing device form - preferably together with the associated lines and pumps - a common cabinet-like Construction unit in which, for example, the chemical tanks form a lower part and the dosing device an upper part of the construction unit form.

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As for the quality of the development and for the image quality, the developer must maintain a certain temperature is responsible, a thermostatic device is also provided that the temperature in a die Chemical cabinet containing chemical tanks and / or in the metering device or in the structural unit on a holds a certain height. For further air conditioning of the system, a with heating and / or cooling devices and possibly with one or more air circulation accelerators such as fans or the like. provided air circulation system be provided within the chemical cabinet or the structural unit.

Around the tanks for the chemicals to prevent the ingress of oxygen To secure in the simplest possible way, the tanks can have floats and / or covering dust covers.

The invention seeks to achieve maximum performance with consistently high quality of the developed material furthermore a programming device, through which the supply of chemicals to the dosing device, the Dosing of the chemicals, their transfer to the developing device and their expiry from this including the The supply and discharge of the rinsing water from and to the metering device and, if necessary, the developing device are controlled will. In the course of the desired programs, a Switching element row, for example in the form of buttons, can be provided, which makes it possible, depending on the desired

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Chemicals or other prerequisites to initiate and run the required program.

Further details of the invention can be found in the following description of an exemplary embodiment.

Show here

Fig. 1 shows an overall view of the system in the form of a Circuit diagram,

2 shows a schematic longitudinal section through the development device,

3 shows a schematic axial section through a metering device,

4 shows a longitudinal section through one in the metering device sensor used according to Fig. 3,

Fig. 5 is an electrical circuit diagram for the operation the dosing device,

6 is a circuit diagram for the electrical control system of a drainage pump used in the developing device;

7 shows the perspective representation of a chemical barrier which simultaneously accommodates the dosing device, with FIG. Yes showing the chemical cabinet and FIG.

8 is a schematic overall view of a chemical cabinet, dosing device and developing device containing it Unit and

FIG. 9 is a view in section along line 9-9 of FIG. 8.

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Fig. 1 shows a circuit diagram of the entire system, the is preferably combined in a structural unit according to FIG.

A chemical cabinet 10, which contains the chemicals required for the development process in individual tanks 11, supplies the liquid required in each case via lines 12 and, for example, via two branch lines IJ) and 14, further via feed pumps 15 and 16 and via lines 17 and 18 Dosing device 19 with the dosing heads 20, of which two are provided in the exemplary embodiment, corresponding to the number of developing devices used.

From the dosing heads 20, preferably from their lowest points, inflow lines 21, which are controlled by, for example, electromagnetically operated valves 21a, lead to the development device 22 with a development chamber 2J>, inside of which developer devices 24, preferably in the form of horizontally positioned developer tubes, are housed . The dosed liquids flow through the feed lines 21 into feed funnels 25, which in turn feed the liquids required for development to the development devices 24 via lines. The developer tubes are used to receive the exposed photographic material to be developed, which is distributed, for example, on the inner circumferential surface of the tubes. A suitable drive 24a drives, as for example Fig. 2 indicates,

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the tubes 24 alternately in one and the other Direction of rotation x ,, x “over a certain angle, so that the material to be developed through the chemical which fills part of the tubes 24 and serves as the developer liquid is passed in one direction or the other. In addition, a device 24b can be provided which to generate a longitudinal rocking movement of the developer stirrer is driven accordingly.

The development chamber 23 becomes the one used, more or less used desiccant liquid by a drain pump 27 via a drain line 28 to the outside or discharged into a collecting room. The pump 27 can also be arranged in addition to a direct discharge line 28a or be designed as an open-gap pump. Furthermore, an overflow can be installed at a suitable height in the lower part of the room 23 or the tub 23a may be provided.

The flushing system of the installation indicated by dashed lines in FIG. 1 has a supply line 29 which is connected, for example, to the local water supply network. It branches into a line 30 for rinsing the dosing heads. The lines 30 are connected via valves 32 and leads 33 ^a 25 n the ZuIauftrichter the developer devices are connected, while the lines 31 through valves 34 and leads 35 leading to the dosing heads 20 of the metering device. Overflow lines 36 ensure that the liquid

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such as one of the chemicals or rinse water Do not exceed a certain liquid level in the dosing heads 20. They are functional at the highest Place of the interior 20a of the dosing head connected to this, so that the entire height of the dosing head can be used for dosing, and lead to the outside or into a special collection container.

3 to 5 show details of a metering device 19 » As can be seen from Fig. 3, the embodiment of the dosing head shown has a hollow, preferably removable cover part 37, the cavity 38 as Collection space for the flushing water supplied through line 35 serves. The collecting space 38 is of the the pipe openings forming pipe ends 39 of the supply lines 17, which are as close as possible above the cover part 37 are bent down to the feed pumps I5 or l6, so that when the promotion is interrupted only a relatively small amount of liquid between the mouths of the Pipe ends 39 and the bends in the supply lines remains. The collecting space 38 stands with the interior 20a through annular openings 38a which surround the outlet openings 39 the dosing heads 20 in connection, in such a way that the rinsing water 38, optionally under pressure, directly to the Outlet openings 39 of the inflow lines 17 into the interior of the dosing head occurs and thereby effectively flushes the pipe openings.

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- li -

To control the valve 21a, which in turn the Connection of the chamber 20a of the dosing head with the inflow line 21 to the developer device controls, a hub in particular serves a solenoid valve,

magnet 40, / whose actuation preferably takes place automatically within the selected programming.

An intermediate wall 4l divides the interior 20a of the dosing head into an inflow chamber 42, into which the inflow pipes 17 open from above, and into a sensor chamber 4j5 which is shielded from the inflow chamber by the intermediate wall and in which the individual sensors 44 can be in any number and with different lengths as well a counter electrode 45 serving as the opposite pole to the sensors are arranged. The sensors 44 and possibly also the counter-electrode 45 are, for example, in the cover part yj, expediently attached removable or replaceable by means of a special insert and protrude up to different heights into the sensor chamber 45 from above.

The number of sensors 44 is arbitrary, so that the dosage can be very finely graduated. The feelers can also be arranged to be longitudinally displaceable or screwable, so that their contacts 46 can be precisely adjusted to a desired height are.

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Of course, the sensors can also be arranged in a different way, provided that only the respective contacts the sensor is at different levels within the chamber 4} and the one inside 20a of the dosing head or in its sensor chamber 4> rising liquid level 47 reached the individual contacts 46 of the sensors at different times. The counter electrode 45 extends at least over a height from the lowest to the highest contact point 46 of the sensors 44.

4 shows a longitudinal section through one of the sensors 44 on a larger scale. The probe has an inner electrode 48, e.g. made of stainless steel, the lower free end of which forms one of the contacts 46 and which are spaced within one of them surrounding pipe 49, from which it is insulated by insulating material 50 such as a polyester resin is. The tube 49 is at its lower end, which in the chamber 4 ^ protruding contact 46 more or less encloses, beveled, wherein the bevel 51 has the purpose of a drop formation when the liquid level falls 47 to prevent below the level of contact 46.

Furthermore, the insulating compound 50 is preferably in the region of the contact 46 against the lower beveled end 51 deposited upwards, so that an air bubble 52 in the lower Part of the sensor tube 49 is formed and an electrical breakdown from contact with moisture on the sensor wall is prevented.

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In Fig. 5 is a circuit diagram for the metering device for example shown. As already described, the electrodes protrude into the sensor chamber 4 3 of the dosing head 20 48 with the contacts 46 of the individual (otherwise not shown) sensors 44 and the counter electrode 45 of in from above. The electrical system receives its current, for example, from the local network indicated at 53, for example with a Operating voltage of 220 volts. There is a motor 54 on the Metz connected, which drives one of the feed pumps 15 or l6 when the power is closed. If necessary, for each of the feed pumps 15 or 16 a separate motor can be provided, or motors 54 can be used, which the pumps 15> l6 drive in groups or as a whole, but a special circuit must be provided so that each after The pump selected in the program is driven alone or, if necessary, together with others, while the rest unselected pumps remain at a standstill or ineffective circulate without delivery to the dosing device.

A switch 55 in the circuit is used to switch on the motor 54 56 of the motor, which is switched on or off by a relay 57

Low voltage

is switchable. The relay 57 is arranged in a / circuit 58, which contains the secondary side of a transformer 59, which in turn is connected to the network 55. The line 58a of the circuit. 58 leads to the counter electrode '45, which e.g. forms the negative pole in circuit 58,

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while the line 58b leads to individual contacts 60, which can be electrically connected to the electrodes 48 of the sensors via individual switches 6l.

The mode of operation of the described control device for the metering device is as follows:

If one of the switches 6l, e.g. the switch 6la that is decisive for the desired dosage, is manually or automatically brought into the closed position 6la 'and the sensor chamber 43 is empty, the circuit 5ö initially remains interrupted. The same applies if liquid, e.g. one of the chemicals from one of the tanks 11, is conveyed into the dosing head 20 for as long the liquid level still remains below the selected contact 46a. However, as soon as the corresponding to this contact Height h is reached, the circuit between the counter electrode 45 and the contact 46a is closed. That Relay 57 thereby opens switch 55 and turns off motor 54. So that driven by the motor 54 is Pump 15 or 16 is stopped and the liquid is conveyed via the associated feed line 17 into the dosing head 20 completed.

FIG. 6 shows the arrangement of a control device indicated in FIG. 2 62 in the lower part 23a of the development chamber 23 *, for example designed as a trough or collecting space, to which the drain line 28a or 28 with drain pump 27 is connected. The control device has the task, for example, that

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Drain pump 27 in operation or in increased operation to set, or a valve in one of the supply lines to the development chamber 23, e.g. the one in the line 33 for the Rinse water arranged valve 32 (Fig.l) or a Valve in the inflow line 21, which a mixture of rinsing water and consumed during the rinsing process Chemicals will switch off or regulate to lower flow rates as soon as the liquid level is in the Trough 23a of the developing chamber 23 a certain level has reached. The main aim of this is to prevent the developing chamber from being flooded by rinsing water or rinsing water mixtures from the line or lines 33 or the line or lines 21 is prevented.

In FIG. 6, for example, the local power supply is again indicated at 53, and a transformer is indicated at 63, whose Primary side is connected to the power grid 53. Furthermore, there is one connected to the network 53 Circuit 64 of the motor 65 of the pump 27, which by a switch 66 closing the circuit can be put into operation.

Lines 67, 68 are also connected to the secondary side of the transformer 63, the line 67 being closed e.g. a negative electrode 69 acting as a sensor and the line 68 with its branch lines 68a and 68b

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lead to two positive electrodes 70 and 71, also acting as sensors. The electrodes 69, 70, 71 are with Contacts 72,73 * 74 provided, which dip into the tub 23a to different depths. The connection to the electrodes 70 and 71 takes place via a relay 75 or, to the electrode 70, via a switch 76 connected downstream of the relay 75, at the end of which the electrode 70 is connected to the line 68.

A relay 77 is also located in a line 68c, which leads to a third positive electrode 78 which acts as a sensor and has a contact 79. Contacts 72,73,74 and 79 are, as can be seen from FIG. 6, staggered in height. The relay 77 actuates a switch 80 in a circuit 8l, by means of which, for example, a magnet 82 of the solenoid valve 32 in the inflow line 33 is actuated, and a switch 83 in a circuit 84 for a warning signal 85.

The operation of the control shown in FIG. 6 is as follows: As long as the liquid level in the tub 23a the development chamber is located below the contact 73, this is in Fig. 6 via the transformer 65 on the network 53 connected electrical power system is de-energized. Since the circuits between the negative contact 72 and the Plus contacts 73,74,79 interrupted sünö. Just that

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Valve 32 is connected to the switch 8o and circuit 8l Network 53 connected and opened, so that the rinse water unimpeded, e.g., through line 33, into the development chamber 22 can flow into it.

But even there, when the liquid level reaches the contact 73 in the trough 23a, the circuit remains interrupted since the switch 76 is open. Only when the liquid level has risen to contact Jk does the circuit between contacts 72 and and the relay 75 are actuated. It closes the switch 66 on the one hand and the switch 76 on the other hand. The closure of the switch 66 has the consequence that the motor 65 of the drain pump 27 is put into operation, so that liquid is conveyed away from the tub 23a and the liquid level in the tub falls. At the same time, however, the switch 76 is closed, closes the circuit for the electrode 70 to the contact 73 and causes even after the level of fluid drops closed under the contact ¹ J ^ a circuit between the contacts 72 and 73 and thus the Entteerungspumpe 27 remains in action until the liquid level also falls below the contact. This delayed switching off of the pump 27 prevents it from being continuously switched on and off as soon as the liquid level rises above or falls below the contact 74.

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Should the liquid level rise even further in the tub 23a despite the operation of the drainage pump 27 increase contact 7 ^ and reach contact 79 will The switch 8o is opened by the relay 77 and the switch 83 is closed. The opening of the switch 80 has to Result that the valve 32 in the inflow line 33 of the rinse water is closed, while the closing of the switch 83 generates a warning signal 85, e.g. optical or acoustic Kind of putting into action. This indicates that the drainage from the tub 23a is no longer working properly and there is a risk of the development equipment being flooded. It must then, under certain circumstances, provided that the liquid level is does not sink again, the drain line and any units arranged in it checked or also be expanded.

Fig. 7 shows the chemicals cabinet in the lower part (Fig. 7a) 10 with the tanks 11, the pumps 15> l6 and the lines 17. In the illustration, the front cupboard wall, as well as one side wall 86, is partially removed. On the Chemical cabinet 10, the upper part 87 (Fig. 7b) can be attached, which contains the dosing device 19 with the dosing heads 20. The controls are on the front wall the necessary actuating elements attached to the system. These have a programmer 88 for receiving a Control card 89 on which the computer program for the sequence of the development of the photographic material

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required work processes is applied. A row of dosing buttons 90 in the form of pushbuttons is used to set the desired dosage by switching on the relevant Sensor 44 must be preselected.

8 and 9 show an entire assembled unit with the chemical cabinets 10, the tanks 11 and a Upper part 87 with the programmer 88 and the dosing buttons On the right chemicals cabinet 10 is a further set-up 91 placed, which can also serve to hold chemical tanks 11. The dosed chemical liquid

.swiveling
passes through two / overflow pipes 21 into the feed funnel (not shown in FIG. 8) and from there into the indicated developer devices 24, which are accommodated within the cabinet 92 enclosing the developer chamber.

An air circulation system indicated by the arrows ζ with an air accelerator such as a fan 93 ensuring that the temperature inside the chemical cabinet remains as constant as possible. The fan 93 supplies here via a channel 94 formed between the tanks and the walls Channels through which the circulating air flows. A heater 95 and a cooling device 96, from which the heat is withdrawn by a compressor 97, ensures that depending on a thermostat 98 the desired Temperature is maintained in the circulating air system. A water catcher 100 is in the lower part of the chemicals cabinet arranged to collect condensation.

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A timer 90a may be provided to vary the programmed timing.

in a schematic section Fig. 8 further shows in the upper part 9l / a single tank 11, the contents of which, formed by the chemical 11a, are sealed against the ingress of oxygen by a float 101. A The dust cover 102 also ensures that dust or other foreign bodies are kept away from the interior of the tank 11 will.

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Claims (1)

- 21 - Mz 103 Expectations; Plant for the development of photographic material, in particular color development, with one that is to be developed Developing device that receives material and feeds the chemicals required for development are characterized by a metering device (19) for the amount of the developing device (24) chemical to be supplied with means (90) for setting the preselectable amount to be dosed and with Means (sensors 44) for automatic dosing of the preselected amount. 2. Plant for developing photographic material with a developing device to which the chemicals required for development are fed in doses via a metering device, in particular according to claim 1, characterized in that the metering device (I9) has one or more vessel-like metering heads ( 20) with sensors (44) of an electrical circuit system (58) which are arranged in the same and which protrude downwards to different degrees and can be held in place, in such a way that the inflow of the chemical liquid when a liquid level (47) is reached , for example by switching off a feed pump (I5, l6) for the chemicals driving electric motor (54) is interrupted.
309835/0623 ^. System according to claim 2, characterized in that the sensors (4 ¹ J-) are connected or optionally connectable to one pole of the electrical circuit (58) and a counter-electrode (45) assigned to the sensors and connected to the other pole of the electrical circuit ) is provided, which is at least to the same depth of the dosing head (20) as the deepest. reaches down into this protruding antennae. 4. Plant according to claim 2 or ~ $, characterized in that the sensor tubes (49) enclosing the electrically conductive electrodes (48) in an insulated manner are beveled (51) at their ends, in particular to prevent the formation of drops. 5. Plant according to one of claims 2 to 4, characterized in that that the insulation (50) in the sensor tubes (49) enclosing the electrically conductive electrodes (48) in an insulated manner, in particular to form an air bubble (52) preventing incorrect switching, against the lower open end of the | sensor tube (49) is reset. 6. Plant according to one of claims 2 to 5> characterized in that the sensors (44) are countered by a calming wall (41) which divides the interior of the dosing head the supply pipes (17) for the chemicals are shielded are. 309838/0623 7. Plant according to one of claims 2 to 6, characterized in that the one or more dosing heads (20) at its lowest point by a drain valve (21a) that can be operated e.g. by means of a lifting magnet (4o) can be controlled for forwarding the metered chemicals to the developing device (24). 8. Plant for the development of photographic material, especially color development, with one that is to be developed Material-absorbing developing device to which the chemicals required for developing are fed, in particular according to one of claims 1 to 7 * characterized by a metering device (19) for dosing the chemicals to be fed to the device (24) and a common water flushing system (29,30,31) for rinsing both the developing device (24) and the developing device containing the same (22) as well as the dosing device (19) 9. Plant according to claim 2, characterized in that the flushing line systems (29,30,31) for the developing device (24) on the one hand and the metering device (19) on the other hand as valve-controlled branch line systems a common supply line (29), in particular a power line system, are connected in parallel to one another. 309835/0623 10. Plant according to one of claims 1 to 9 *, characterized in that that the rinsing water the supply pipes (17) for the chemicals at their outlet openings (39) is fed into the dosing head (s) (20) for washing out the outlet mouths. 11. Plant according to claim 10, characterized in that the rinsing water for rinsing the outlet openings (39) of several chemicals supply pipes (17) in one of the Outlet mouths (39) upstream, above the same arranged collecting space (38) is passed. 12. Plant according to claim 11, characterized in that the Collecting space (38) and the pipe sections of the chemical supply pipes which penetrate it and form the outlet openings (39) (17) in a preferably removable and preferably also the sensor (44) receiving Lid part (37) of the dosing head (20) are arranged. 13. Plant according to one of claims 1 to 12, characterized in that that the feed pipes (17) for dd4 chemicals which open into the dosing heads (20) from above just above the outlet mouths (39) down to deep - preferably separate feed pumps (15 * 16) are bent. 309835/0623 14. Plant according to one of claims 1 to Ij5, characterized in that the or each of the chemicals receiving dosing head (20) of the dosing device (19) are provided with an overflow (j56) arranged in the upper part for rinsing water. 15 · Plant for the development of photographic material with a developing device which is necessary for the development Chemicals are fed and that is turned into a water flush system, especially after one of the Claims 1 to 14, characterized by a safety device (62), which when a certain liquid level is exceeded in the developing device (22) or increased drainage if the flow of water or chemicals from the developing device is hindered causes and / or the flow of the rinsing water or, if necessary, the chemicals to the developing device interrupts in whole or in part. 16. Plant according to claim 15, characterized in that at the same time or approximately simultaneously with the increased drainage or with the interruption of the inflow to the developing device, but in particular when a maximum permissible liquid level is exceeded, a warning signal (85) is actuated. 309835/0623 17. Plant according to claim 13 or 14, characterized by a drainage pump (27) * which for additional drainage in operation or in increased operation is set. 18. Plant according to claim 15, 16 or 17, characterized in that that the device to interrupt the inflow or to increase the outflow in one Collecting space or a trough (23a) of the developing device (22) is arranged. 19. Plant according to one of claims 15 to l8, characterized in that that the complete or partial deactivation of the increased drainage, e.g. by stopping a drainage pump (27), is only effected after the liquid level has dropped below a level, which is below that at which the drainage increases, e.g. the drainage pump (27) in operation is set. 20. Plant according to one of claims 15 to I9, characterized in that that the increased drainage of the developing device (22) by one or more in a liquid collecting space (tub 2} a) protruding at different depths, an electrical circuit system (67,68) is controlled via the liquid-controlling sensors (electrodes 69, 70, 71, 79). 309835/0623 21. Plant according to claim 20, characterized in that in addition to an electrode (69) connected to one pole of the circuit, three further sensors (70.71 * 79) projecting differently deep into the liquid collection space (2 ^ a) are provided, of which the on
at least deeply protruding fillers (78) the inflow to the
The developing device (24) is partially or (preferably) completely interrupted, the second-lowest protruding sensor influences a circuit (67, 68a) via the lowest-reaching sensor (69) and via the liquid to the second-lowest sensor (72) and thus influences the increased drainage, In particular, a drainage pump (27) starts up or intensifies its operation, in such a way that the increased drainage, for example the effect or increased effect of the drainage pump (27), if necessary also the interruption of the inflow to the developing device (22), only when the liquid level falls below the lowest point Sensor (72) is canceled. 22. Plant according to one of claims 1 to 21, characterized in that that the liquid collecting space (trough 2j5a) of the developing device (22) for protection against Flooding is provided with an overflow in addition to a drainage pump (27). 309835/0623 2yy. Installation according to one of Claims 1 to 22, characterized characterized in that dosing device (19) and chemical tanks (11) and / or developing device (22) - preferably with the associated lines and pumps - a common cabinet-like Form unit. 24. Plant-according to claim 2J>, characterized in that the chemical tanks (11) form a lower part and the metering device (19) form an upper part (87) of the structural unit. 25. Plant according to one of claims 1 to 24, characterized by the temperature in one of the chemical tanks (11) containing chemicals cabinet (10) and / or in the metering device (19) or in the A thermostatic device (98) that maintains a certain height. 26. Plant according to one of claims 1 to 25> characterized by one with heating and / or cooling devices (95i96) and optionally with one or more air circulation accelerators provided air circulation system within the chemical cabinet or the structural unit. 309835/0623 27 · Plant according to one of claims 1 to 26, characterized characterized in that the tanks (11) for the chemicals against Have floats (101) and / or dust covers (102) that secure oxygen access. 28. Plant according to one of claims 1 to 27 *, characterized in that that the developing device (22) in addition to the preferably on a chemicals cabinet (1O) attached metering device (19) and lower than this is arranged and the dosed chemicals through the feed funnel (25) of the developing device (24) swiveling inlet pipes (21) to the, for example, accessible from above Developing device (24) are supplied. 29. Plant for developing photographic material with tanks holding the chemicals, a metering device for dosing the chemicals, a developing device to which the dosed chemicals are fed and a water rinsing system for dosing device and / or developing device, in particular after a of claims 1 to 28, characterized by a programming device (88,89,90) through which the inlet of the Chemicals to the dosing device (I9), the dosing of the chemicals, their transfer to the developing device (24) and its drainage from this including the supply and discharge of the rinsing water from and to the metering device and the developing device is controlled. 309835/0623 30. Plant according to claim 29, characterized in that for triggering the programming device a the metering preselecting switching element row (90) is provided. 31. Plant according to claim 29 or 30, characterized in that the programming device (88.89 * 90) is arranged on a box-like cabinet part (87) containing the metering device (I9). 309835/0623