DE2343067C3 - Blueprint device with a device for area-proportional replenishment of developer material - Google Patents

Description

35

The invention relates to a blueprint device as detailed in the preamble of the main claim is described.

In blueprint devices of the type described, there is in some cases, especially in the so-called DPD (Diazo Powder Development) devices, the problem of replenishing used developer. at The DPD process is a dry development process in which certain amines Enriched fine-grained materials for developing the exposed diazo paper trickle over it, the amines bring about the coupling of the uncleaved diazo compounds.

During this process, small amounts of amine compounds are always removed from the developer material. The DPD process is described in DE-OS 21 26 160, for example. In this process, good copies are obtained over a long period of time, ie for many m ² of material to be developed, but a larger amount of amine must then be added. The invention is generally concerned with the creation of a blueprint device in which the subsequent metering can be carried out easily and safely even in such more difficult cases as the DPD method described.

The replenishment or the regeneration of developers is already on in reproduction technology tried in many ways. In DE-OS 22 884 such a regeneration device described, in which the regeneration coefficient is determined by the fact that the original image in Blackness and area measured with the help of a single photocell and the value obtained for Control of the supply of fresh developer solution used wjrd. This method is forbidden with normal. Blueprint machines because of developer consumption is largely independent of the degree of darkness of the original essentially depends on the area of the tracing paper to be developed.

For regeneration in photographic continuous developing devices, it has already been proposed in DE-OS 15 97 650 to adjust the speed of a motor operating the metering pump by switching on different resistors in the motor circuit with the help of various switches that can be controlled by the material passing through depending on its width are to be operated. In the same DE-OS it has also already been proposed to register and store the length of material that has passed and, after passing a predetermined length, to put the timer for the metering of regenerated material into operation for the corresponding time. The solution described last is only suitable for film material of a certain width. As soon as materials of different width and length are used alternately, there is again the problem of adequate metering, which cannot be solved by the possibilities disclosed in the DE-OS. In particular, with this replenishing device the actuation of the diaphragm pump for replenishing developer does not take place when a certain area of material has been developed, but only when the length required for replenishing has just been reached with a certain roll width. If, on the other hand, the memory for the other roll widths is just before the value required for metering, there is still only a small additional metering, although considerably more developer would have to be added, since a lot of material has already been developed for other widths as well, which is also the case contributed to the impoverishment of the developer.

DE-AS 10 98 362 describes the evaporation rate of an ammonia to couple the working blueprint device with the throughput speed of the material. With this one There is no way of taking different paper widths into account, and there is no method also no possibility of exact metering of developer discontinuously after longer periods of time to undertake.

In DE-AS 18 14 980 a photocopier is described which has a device for supplying liquid developer. This feed device contains an RC element for actuation, the resistance of this fiC element being reduced by short-circuiting parts of a total resistance, the greater the width of the paper, depending on the width of the tracing paper. This has the effect that the capacitor voltage required for actuating the feed device is reached more quickly with larger paper widths than with smaller paper widths. This very simple device, however, can only be used for the constant addition of developer during operation. If, on the other hand, as in the DPD process, the developer is only to be metered in at very long intervals, which can be several days, this process cannot be used.

In DE-OS 17 72 564 a metering device is at a roll paper developing machine described,

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which can work with several paper webs of different widths at the same time. Control the papers the application of a voltage to a different number of poles of a multi-pole via push-button switch Switch. The switch is driven at constant speed and always operates the dosing motors when the contact that has just been tapped during rotation is live. That way becomes a Simultaneous width-proportional metering when working with several paper webs at the same time enables. In order to prevent that, especially with short sections of the path in one treatment line the redosing does not take place because the rotary switch has not yet reached the corresponding point of its circumference has arrived. is also provided in this DE-OS, the contacts assigned to the individual tracks of the To arrange the switch offset. - This facility is not suitable for working with different Throughput speeds of the copy material.

By DE-GM 18 65 362 is a blueprint with a device for area-proportional replenishment of developer material of the relevant here Genus described in which tracing papers of different formats are taken from magazines will. In this utility model, there are a plurality of microswitches across the direction of passage provided, whereby »each of the microswitches in the sense of a feed of the length and width of the Electric counting impulses corresponding to the layer substrate to a counter a pulse generator switched on « is. Depending on a certain number of the width or length of the photographic support A regenerator metering device can be provided for indicating counting pulses. At this facility thus counting pulses corresponding to length and standardized width values of the layer carrier are a Counter fed - in view of the pulse generator assigned to each standardized width value the effort for this device is relatively large and it must be susceptible to failure, which is not inconsiderable can be expected in particular if the pulse generators are electromechanical.

Finally, the state of the art includes a device similar to the utility model discussed, namely according to DE-AS 12 78 240, which also has a device for replenishing Developer material of the relevant genus describes here are transverse to the direction of transport an arc lying sensing organs are provided, which are connected to a pulse generating device, whose Pulse sequence is proportional to the sheet feed speed. The width of a sheet is thus in individual Divided into intervals with a tactile organ assigned to each interval Surface is then the number of the pulse generating device depending on the feed speed the impulses generated by the arc are counted. that is provided for a portion of the width of the sheet to be developed is an individual one Switch of a pulse generator device which is coupled to the feed is assigned to each width switch is connected in series to a switch of the pulse generator All series connections of the switches are connected in parallel to the input of a pulse counter. This arrangement acts so that in the series connections connected in series according to the width of the material to be developed Pulses are generated, which are counted in the pulse counter. The sum of the impulses thus corresponds to several pulse series, with each pulse series according to a width segment is produced. - This circuit arrangement can only function in the desired manner if all switches work properly. With the multitude of in the known arrangement necessarily However, the switches to be provided are to be feared of malfunctions.

The object of the present invention is therefore to provide a blueprint machine with a device for post-metering to create developer material of the kind specified in the preamble of the main claim, the automatic exact replenishment of developer material - even at longer intervals - permitted, even if several rolls of copier material of different widths are used, the copy material is separated in lengths adapted to the original and the copy material in different speeds is processed. At the same time, the facility should be characterized by a low Expense, in particular characterized by a small number of required pulse generators and switches and, above all, be insusceptible to faults in operation.

According to the invention, this object is achieved by a device as defined by the main claim is marked in more detail.

The subject matter of the invention is particularly characterized in that only one for all width sections only common encoder, a voltage encoder, is provided, which one of the speed of the Tracing paper supplies proportional voltage. In the formation of the developer replenishment-determining Signal only a single multiplication is carried out, namely the multiplication for the Voltage transmitter output speed proportional voltage with a voltage value, which corresponds to the largest scanned width. However, as according to the state of the Technique, a large number of the individual width sections, the total of the largest scanned width result, corresponding partial sizes are formed. Rather, according to the invention, the pulses that ultimately are added in the counter, derived from a voltage value, which is already the total product corresponds to the copy material area and not the width sections corresponding to the partial products.

Preferred embodiments of the invention are defined in the subclaims and in the following Examples described with reference to the figures can be seen. It shows

F i g. 1 shows a schematic representation of the arrangement of pushbutton switches for the various paper widths assigned,

2a shows a block diagram of the electrical control the redosing device,

F i g. 2b a modified block diagram,

Fig.3 is a block diagram for converting the area-proportional voltage into an area-proportional number of pulses,

F i g. 4 another embodiment of the electrical Switching of the dosing device,

5 shows a block diagram of a further exemplary embodiment an electrical circuit for the dispenser,

Fig. 6 is a block diagram of an electrical circuit for controlling the metering device and

F i g. 7 shows a schematic representation of an embodiment with mechanical generation of the pulse sequence.

In the DPD process, in which amine compounds adsorbed on granular carrier materials are allowed to trickle over the exposed tracing paper, for example, after 300 m ^{2 of} paper has been used, a defined amount of developer (amines) should be added so that the development of the papers again done optimally. In modern blueprint machines, several rolls of blueprint paper of different widths are provided in order to be able to accommodate the most varied of original formats. In Fig. 1 the infeed of tracing papers of different widths of different lengths is shown schematically. The direction of entry is indicated by the arrow 1 and the contact edge by the line 2. Switches 51, 52 and 53 are arranged in the path of movement of the tracing papers. These switches are designed and arranged in such a way that the narrowest paper a 1 only actuates switch 51. The next wider paper a 2 actuates both the switch 51 and the switch 52. The switch 52 is switched so that it simultaneously switches the switch 51 off again. The switch 52 has an “on contact” and an “off contact” for this purpose, the “off contact” being connected in series with the switch 51. The switch 53 likewise has an on contact and an off contact, the off contact of the switch 53 being connected in series with the on contact of the switch 52. In this way it is ensured that when the paper a 1 passes through only the switch 51, the paper a 2 only the switch 52 and the paper a 3 only the switch 53 is effective. This link can also be achieved with electronic digital modules, for example an OR element.

To explain the first example of a control of the metering of z. B. amines reference is now made to the block diagram of FIG. In the generator 3 is a DC voltage whose size is proportional to the speed of the copy paper. This DC voltage can be generated, for example, by a tachometer voltage generator or in any other known manner. As soon as the leading edge of one of the paper formats has reached the switch 51, 52 or 53, the Control unit 4 actuates a switch 54. The control unit can be an OR gate with three Acting inputs whose output controls a transistor, in whose collector-emitter branch a Relay coil is arranged, which in turn actuates switch 54. The OR gate 4a has at the output only then 0 if all inputs are 0. Instead of this a direct electrical control without a mechanical switch can of course also be used will. As soon as at least one of the switches 51, 52, 53 is closed, the control unit 4 is via the Line 40 from a short pulse which resets the integrator 5 to zero, for example by the capacitor (see below) a transistor is briefly short-circuited.

The voltage of the tachometer generator 3 is integrated in the integrator 5. With this integrator it can be an operational amplifier with a capacitor circuit in the feedback branch, for example under the type designation 3268 from BURR-BROWN.

The trailing edge of the paper causes switch 54 to open and switches 55 and 57 to open getting closed. This closing of the switches is effected by the unit 7.

Via the closed switch 55 and 57, the integrated voltage of the tachometer generator 3 arrives at one input x \ of a multiplier 8 and, on the other hand, a voltage arrives through the control unit 6 at the second input y \ of the multiplier 8, the size of which is proportional to the paper width. The switches 51, 52, 53 can each control different relays, which apply predetermined voltage sources to the switch 57, or the switches can each control a transistor that has resistors of different sizes in its emitter branch.

ö de has, which in turn provide the voltage for the switch 57. A voltage thus appears at the output of the multiplier 8, the magnitude of which is equal to the product of the numerical values of the input voltages (multiplied for practical reasons, for example by a factor of 0.1). This output voltage of the multiphier 8 is proportional to the paper surface passed through. The voltage is fed to an analog-to-digital converter 9, for example the unit which is commercially available from BURR-BROWN under the type designation ADC-30-12N-USB. At the output of this analog-to-digital converter, pulses are emitted at a frequency that is proportional to the input voltage. These pulses are fed to a subtracting preset counter 10, for example the counting unit which is commercially available from Landis-Gyr under the type designation RP 214 E. When a certain predeterminable number is reached, the counter 10 controls a metering process with its switch 11, for example adding a certain amount of amine to the developer container. If desired, a frequency divider can also be switched on between the analog-digital converter and the counter. Since the control unit 7 switches the multiplier to voltage via the inputs xt and y \ only during a defined, constant time, which z. B. can be done with the help of a non-stable multivibrator, the number of pulses emitted by the analog-digital converter is proportional to the area of the paper passed through.

Instead of a finished analog-digital converter, the output voltage of the integrator 8 can also be used With the help of a circuit it can be converted into counting pulses, as shown schematically in FIG. Both a sawtooth generator 12 and a pulse generator 13 are generated by the trailing edge control 7 started. The output voltage of the sawtooth generator 12 becomes one input of a comparator 14 and the output voltage of the integrator 8 is fed to the other input of this comparator 14 As soon as the sawtooth voltage has risen from 0 to the same value as the output voltage of the integrator 8, the comparator 14 outputs a pulse that the pulse generator 13, for example a multivibrator, stops. In this way, the pulse generator 13 has a number of counting pulses which is proportional to the output voltage of the integrator 8. These counts become one Preselection counter 10 supplied to the metering unit 15, for example, when the preselected number is reached

se by opening a valve in the amine supply line, actuated for a defined period of time. Thereafter, the counter 10 begins to count again.
Instead of a preset counter, a

Stepper motor are used, the angular position of which is proportional to the number of supplied Impulse is. If necessary, a frequency divider can be connected upstream of the stepper motor causes z. B. only every two hundredth pulse causes a step circuit. The stepper motor can directly or in connection with a gear at a certain angular position trigger a pulse that in turn causes the defined amine supply.

In order to eliminate errors as far as possible, there is a between the control unit 7 and the adder 10 Control line 70 is provided, which also makes the adder ready to receive only during the defined time.

The in Fig. 2b differs from the example just described essentially in the absence of the integrator 5 and the control unit 4 with switch 54 and another control unit 71. B. a relay, the closing of the switches 55 and 57. This arrives at the input λϊ of the multiplier 8, the voltage of the generator 3, the size of which is proportional to the speed, and at the input yt a constant voltage that is generated by the unit 6 accordingly the actuated switch is proportional to the width of the copy paper passing through. The output voltage of the multiplier 8 is therefore proportional to the surface speed (cm ² / sec) of the copy paper. The analog-digital converter 91 converts this voltage into a pulse train, the frequency of which is proportional to the input voltage. The number of pulses counted by the counter 10 is therefore proportional to the mentioned area of the copy paper passed through. The line 70 between the control unit 7i and the counter 10 has the meaning that the counter 10 is only switched on during the time in which at least one of the switches 51, 52, 53 is actuated for copy paper. Instead of the switches 55, 57, the control unit 71 can also operate a single switch which is arranged in the connecting line between the multiplier 8 and the analog-digital converter 91 (see FIG. 4).

Another embodiment of the control of the post-metering device is shown in FIG. In this example, the front edge of the tracing paper causes the switch 54 to be switched on and thus the application of the voltage proportional to the speed of the voltage generator 3 to the integrator, the output of which is this time connected directly to the multiplier input of the multiplier 8. The respectively actuated switch 51 or 52 or 53 applies via the control unit 6 the to the further input of the lYiUiLtpiizicrciT ο uic L / rGitcnproporiionsic opsnnung i4i or Ubi or Ua. This results in a voltage t / 3 at the output of the multiplier, the size of which is proportional to the area of the copy paper passed through. This output voltage £ / 3 is applied by the control unit 7, which is actuated by the trailing edge, to the circuit 17 for a constant period of time, as shown in FIG. 3 was shown in more detail and described above.

In Fig. 5, finally, an example of a control circuit is shown schematically in which instead of a Multiplier an amplifier 81 is used, which converts the voltage coming from the integrator 5 amplified a factor, which in turn is determined by the switches 51, 52, 53 and is proportional to the width of the paper The gain selection takes place in a switching unit arranged in the amplifier 81 82 with the help of switches 51, 52 and 53. At the output of amplifier 81 there is again a The voltage proportional to the area covered, which is transmitted from the trailing edge via the control circuit 7 controlled with the aid of the analog-digital converter 17 described in detail in connection with FIG is converted into counting pulses, the number of which is proportional to the voltage, which are added up. the The frequency of the impulses is constant. When a preselected amount is reached, the metering device actuated.

Another example is shown in FIG. The leading edge of the tracing paper lays over the Control unit 4 the voltage generated by the tachometer generator 3, which is proportional to the speed (cm / sec) of the tracing paper passing through is to the integrator 5. At essentially constant Speed results in an approximately linearly increasing voltage at the output of the integrator.

A width-dependent voltage is generated by the control unit 6 in accordance with the paper width, ie by the respective switch 51, 52 or 53. Both the output voltage of the generator 5 and the reference voltage U (b) , which is inversely proportional to the width, are applied to the two inputs of a comparator circuit 18. As soon as the two voltages on the comparator 18 match, it emits a pulse via its slart-stop connection, which resets the integrator 5 to zero, ie the pulse causes the "sawtooth voltage" to start again and the comparator 18 emits a counting pulse the counter 10 from. The voltages U (b) are selected in comparison to the voltage rise at the integrator so that the comparator 18 always emits a pulse after passing through a fraction of the smallest area to be treated. If the smallest area to be treated is, for example, a DIN A4 format, then a pulse should be assigned to an area that represents a fraction of a DIN A4 format. If the speed of the tracing paper changes, the number of pulses for a certain paper surface is retained because the tachometer voltage reaching the integrator is correspondingly higher, so that a pulse is emitted by the comparator 18 more often in the unit of time than at a lower speed . _

Instead of selecting the reference voltage U (b) , it is also possible to vary the rise of the sawtooth generator 5 via the switches 51, 52, 53. While in the case described first, the largest voltage U (b) is applied to the comparator with the narrow width of paper and the smallest voltage U (b), that is, the voltages U (b) behave inversely to the widths i In this case, the setting of the integrator - which is operated like a sawtooth generator - is carried out in this case at one and the same voltage U (b) in such a way that the sawtooth generated at a constant voltage of the tacho generator 3, the steeper the The width of the paper is The counting of the partial areas can take place at the beginning or at the end of the sawtooth.

Finally, an example is shown schematically in FIG in which the electrical impulses are generated by a mechanical unit. At 20 should schematically a drive roller for the transport of the copy paper be marked. On the wave there are several (e.g. three)

Perforated disks 21, 22, 23. The number of holes 210 or 220 or 230 is proportional to the assigned Paper widths. Each perforated disk is assigned a light source 211, 221, 231, e.g. a light bulb, and a receiver 212,222,232, e.g. B. a phototransistor.

At the three inputs of a control unit 24 there are pulse trains during operation, the frequency of which is proportional to the speed of the copy paper. The switches 51, 52, 53 have the effect that only one of the three incoming pulse trains reaches the counter 10, which, as above, controls the replenishment of amine when a certain number is reached. For this purpose, the three switches 51 , 52, 53 are connected to three AND elements Ui, U2, t / 3, each with four inputs, in such a way that the first AND element allows the pulses of the phototransistor 212 to pass through when 51 is connected to L, 52 and S3, however, are at 0, that the second AND element 212 only lets through the pulses of the phototransistor 222 when the switches 51 and 52 are at L , the switch 53, however, is at 0, and that the third AND element i / 3 die Pulses of the phototransistor 232 only pass when all switches 51, 52 and 53 are on 0. This logical combination can be achieved with two negation elements as shown in FIG. The three outputs of the AND elements are combined via a triple OR element 0123 and the output of the OR element is connected to the counter 10. This circuit shown above by way of example is for the circuit shown in FIG. 1 of the paper inlet of three rolls with a common leading edge 2, in which the paper al only closes switch 51, paper a2 switches 51 and 52 and paper a 3 closes all switches 51, 52 and 53, ie from 0 to L represents. For other configurations of the paper inlet, other circuits can be provided within the scope of the invention.

In addition 8 sheets of drawings

Claims (8)

Patent claims: 1. Blueprinting device with a device for the optional supply of blueprint paper of at least two different paper widths to an exposure station, a developing device for developing the exposed tracing paper, a device for scanning the tracing paper, which is controlled by the leading edge and the trailing edge of the respective width of the used Switching elements assigned to the tracing paper operated, and a device for area-proportional Re-dosing of developer material, with at least one with a paper feed device coupled electrical transmitter, a control circuit, ϊ.13 the signal of the electrical transmitter and the signals formed by switching elements are linked to one another to form pulses as well as with a counter that adds the pulses and when a preselectable value is reached Value switches on the device for replenishing the developer material, characterized in that that a transmitter is a voltage transmitter (3) that supplies a voltage that is proportional to the speed of the tracing paper (tacho voltage transmitter) that the control circuit (6) has a voltage source, the voltage of which is proportional to the respective width of the tracing paper is and which is switched on by the relevant switching element (51,52, 53) that the speed-proportional voltage of the voltage generator (3) and the voltage of the control circuit (6) are connected to the inputs of an electronic multiplier (8), the one Output voltage supplies whose numerical value is the product of the numerical values of the input voltages is proportional that the output of the multiplier (8) with the input of an analog-digital converter (91, Fig. 2b) is connected, the one of the input voltage proportional pulse number at the output generated, and that the output of the analog-digital converter with the input of the counter (10) connected is. 2. Blueprint device according to claim 1, characterized in that between the voltage transmitter the voltage proportional to the speed and the one input of the multiplier of the series after a first control switch (S4), an integrator (5) and a second control switch (55) are switched on are that the first control switch (54) by the leading edge of each copy material web on (electrical Connection) and switched off by the trailing edge (electrical interruption) that the second control switch (55), however, only through the rear edge by means of a control circuit (7) for a constant duration is switched on, and that between the voltage source (6) of the control circuit and the other input of the multiplier, a third control switch (57) is switched on, the as well as the second control switch by the trailing edge of the copy material web over the Control circuit (7) is switched on for the same duration and thereby the voltage proportional to the width to the second input of the multiplier. 3. Blueprint device according to claim 1, characterized in that the output of the speed-proportional Voltage transmitter (3) switched on via a first of the leading edge of the copy material and of the trailing edge of the Copy material switched off control switch (55, Fi g. 2b) to one input of a multiplier (8) is placed that the voltage of the control circuit (6) with the other input of the Multiplier (8) is connected via a second control switch (57), which is switched in the same way as the control switch (55) that the output of the multiplier with the input of a pulse generator is connected, which emits a pulse train, the frequency of which is proportional to the input voltage and that the output of the pulse generator is connected to an adder 4. Blueprinting device according to claim 3, characterized in that instead of the two to the Control switches (55) and (57) arranged between the output of the multiplier inputs pulse generator and the input of the adder, a control switch is provided which is controlled by the Leading edge on and off by the trailing edge of the copy material. 5. Blueprinting device according to claim 1, characterized in that a first control switch (54) can be actuated by the front edge of the copy material and this control switch shows the voltage of the voltage generator (3) in F i g, which is proportional to the speed. 6 to an electrical integration unit (5) switches that the control circuit (6) has a voltage source whose voltage (Ub) is inversely proportional to the respective width of the copy material and is switched on by the switching element arranged for the respective width, that the output voltage of the integrator and the The set voltage (Ub) of the voltage generator (6) is fed to the inputs of a comparator circuit (18) which, if the two voltages match, emits a pulse at its output that this output is connected to the input of the counter and that this output is also connected to the Reset input of the integration unit is connected in such a way that the pulse of the comparator circuit resets the integration unit to zero. 6. blueprint device according to claim 1, characterized in that the speed proportional Voltage transmitter (3) via a switch (54) operated by a leading edge control (4) is connected to the input of an integrator (5) that the output of the integrator (5) with the one Input of a multiplier (8) is connected, the other inputs with a voltage that is proportional to the width, connected through the control unit (6) that the output of the multiplier lying tension through the rear edge of the material by means of a control circuit (7, S5, F i g. 4) to which one input of a comparator circuit (14) is connected, the second input of which is connected to the output of a sawtooth generator (12), which in turn is controlled by the control circuit (7, Fig. 3) is set in motion that a pulse generator (13) by the trailing edge control circuit (17) is started, which emits pulses at a constant frequency to a counter (10), and that the comparator (14) emits a pulse when the input voltages match, which the Pulse generator stops. 7. Blueprint device according to claim 1, characterized characterized in that the speed proportional Voltage transmitter (3) via a switch operated by a leading edge control circuit (4) (54) is connected to an integrator (5), the output of which is connected to the input of an amplifier (81 in Fig. 5) is connected that represents. The amplification ratio of the amplifier (81) by one of the Front edge of the copy material actuated control circuit (82) is set proportionally wide that the area-proportional output voltage of the amplifier (81) by means of an analog-digital converter (17) is converted into a number of pulses proportional to the input voltage, and that these pulses are fed to the adder (10). 8. blueprint device according to claim 1, characterized in that the drive (20) has a feed device for the copying material co-rotating elements (21, 22, 23 in Fi g. 7) are provided which a number of electrical pulses per revolution on the assigned to the elements Release line (213,223,233), with the numbers are in the same ratio to each other as the corresponding copy material widths that of the Copy material leading edge operated switches (S1, S2, S3) each one of the corresponding copy material width Connect the associated line (213, 223, 233) to the input of the pulse adder (10) and that the adder (10) actuates the post-metering device when a certain number is reached.