DE2414792A1 - CONTROL CIRCUIT FOR MALFUNCTION DETECTION AND A SYSTEM FOR ITS ELIMINATION IN A COPY / DIFFERENTIAL MACHINE - Google Patents

Description

Patent attorneys

ping. A. Grünecker - 1 -

Dr.-Ing H. i \>. liikisy

Dr.-Ing. VV. StccLvair March 25, 1974

• Munich 22, Maximiliane. 43
CF :. K. SCHUMANN - DIPL.-ING. P. JAKOB ρ

XEROX CORP.

Xerox Square, Rochester, N.Y. 14603, USA

Control circuit for strength detection and system for their elimination in a copier / multiplier machine

The invention relates to a copier / duplicator with staggered copy counting and display devices, the a first counter for displaying copies up to a predetermined number and a second counter for displaying copies. Have copies above the predetermined number, and with a device for detecting an actually occurring state of insufficient paper supply during a copy run and to interrupt the operation in the machine, the counting and display devices and transfer to the interruption mode, whereby the paper supply is renewed and copying, Counting and displaying can be resumed to end the copy run.

Copy-duplicating machines based on that of F. CarXson discovered and described in US Pat. No. 2,297,691 have become an important part of the present day Business tools have become used. With the progressive

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In the trend of technology in the field of copy / reproduction machines, highly developed functions were introduced into the basic type of machine in order to automate and improve their operation.The increasing complexity and complexity caused by the advanced copy / reproduction machines results in the demand for a more precise one , more reliable and faster control circuit for controlling or "dos control operation of various machine elements, and for synchronizing various machine functions.

One of these functions is a staggered calculation scheme, which is used to charge the customer a higher price pxo copy for the use of the machine if a number of copies below a certain maximum value is made with a machine start or a copy run, and to charge a lower price per copy if the number of copies made during a copy run exceeds this maximum value. In such a case, it is desirable that. the uniformity of the total copy count as well as the staggered copy count is retained, so that the customer is not burdened with a higher billing rate. This is when the engine operation ⁿ the middle of a copy run oh a start interrupted necessary in particular, wherein the interruption may be due to any number of special conditions such as jamming of the paper, a going out of paper supply, or a fraudulent manipulation of the staggered charge counter, occur .

The object of the present invention is to provide an improved control circuit for a reproduction machine.

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This object is achieved according to the invention in a copier / Duplication machine of the type mentioned, achieved by an arrangement which is characterized by a Detector for detecting the artificially created state of missing paper supply and for generating a "paper supply all" signal,

a device for determining from the nature of the "paper supply all" signal, whether this indicates the actual or an artificially induced state, and for generation a first signal, which indicates the actual state, and a second signal, which is artificially induced State indicates

means responsive to the first signal for placing the machine and counting and display devices in the interrupt -To set operating mode and

a device that responds to the second signal and the Copy run ended, whereby an attempt to create the staggered counter by introducing a -artificial "Paper supply-all" -status- is prevented.

The improved control circuit according to the invention can advantageously be used in conjunction with a device for detection a deadlock condition and / or in connection with a device that determines whether the paper has run out is, and / or in connection with a device that determines whether the counting device of the copier / duplicating machine fraudulently manipulated.

Another advantage of the control circuit according to the invention

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is to maintain the integrity of the counts of the prints made, regardless of an interruption of the engine after the start, but before completion of the preparation of a pre-set by the operator number of .Kopien. In addition, it is possible with the control circuit according to the invention to maintain the completeness of the copy count in a staggered calculation device of the copier / duplicating machine regardless of an interruption of the copying operation during the copying run.

These and other features of the present invention are achieved according to the invention in that a device is provided in the control circuit which prevents further counting of the counting devices if the machine operation stops due to a jamming condition or a lack of paper supply, and a device which enables the counting devices to do so To continue counting after the fault conditions have been cleared and copier operation has restarted , and that further means are in place to ensure that the copies are counted correctly regardless of the interruption.

Another feature of the present invention is that there is provided in the control circuit means which has the effect that the counting devices count up to the occurrence of a deadlock condition and still include this, which means an additional erroneous counting, and that a device is provided which prevents the counting devices the first of the machine after removing the fault

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state and restart count.

Another feature of the present invention is to provide a means to remedy the out-of-paper condition detects during a copy run and distinguishes whether he is on a fraudulent influence of the paper supply or based on an actual paper run out.

For a copier / duplicating machine, an improved one is used Control circuit created for coping with situations related to the interruption of machine operation. The circuit has detectors for the detection of abnormal conditions, such as a paper jam or a paper shortage during a copy run for a predetermined number of copies, as well as to maintain the completeness or integrity of the counting of the copies, which is based on a graduated calculation scheme regardless of the interruption of machine operation during the copy run. In addition, the Circuit a detector for detecting a paper jam condition, which was artificially created to fraudulently influence the tiered billing meters, as well as a facility to control the machine stop and return the billing meters to the higher calculation mode.

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The foregoing and other features of the present invention are from the detailed description of the exemplary embodiments in connection with the drawings even more clearly understandable.

It shows: ■

1 shows a perspective view of a copier / duplicating machine, in which the control circuit of the present invention can be used,

Fig. 2 schematically shows the operating parts of a xerographic copier / Duplicating machines which can be part of the machine shown in FIG. 1 and with which the control circuit is connected the present invention can be used,

3 schematically certain internal machine elements of the control circuit of the present invention,

Fig. 4 is a schematic drawing of a locking switch according to Fig. 3, which is used to turn off the power to certain parts of the machine so that the operator the machine can safely open in order to eliminate a deadlock or malfunction,

Fig. 5 is a schematic end view of a scanning device shown in a xerographic copying / duplicating machine according to FIGS. 1-3 is used,

6 schematically shows various input and output signals which act on the control circuit or on which the control circuit acts, and a highly generalized block diagram, which represents larger functional elements of the control circuit,

Figures 7A-7C

certain types of circuits used in the control circuit of the present invention

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8A-8C show an example of a timing signal generator circuit; which is used in the control circuit,

Figs. 9A-9B, when connected as shown in Fig. 10, show a detailed block diagram of the control circuit of the present invention,

11 is a truth table useful in understanding the circuit of the present invention in its Disruption phase is

Figures 12A-12D

Timing waveforms showing the state of the missing

Contain paper supply that was detected by the control circuit, _

Figures 13A-13G

Timing waveforms showing the ability of the present control circuit to switch between the state of the To distinguish between a lack of paper supply and a fraudulent influence on the apparatus.

In order to understand the control circuit of the present invention To facilitate this, its operating parts will be described in connection with a xerographic copier / duplicator, the perspective view of which is shown in FIG. Under Referring to Figure 2, it may be a xerographic machine of the following type. She has a drum a photosensitive, insulating outer coating 3 to the various operating elements to achieve the usual xerographic functions are arranged, namely a cleaning wing 4, a charge corotron electrode 9, a device 10, the a scanning device 13 and an optical system 14 in order to

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scanned image of an original Π on the light-sensitive, to apply insulating coating, as well as a device 15 for applying tint particles to the light-sensitive, insulating coating, a transmission corotron 17, a paper removal corotron 16, a pre-cleaning or pre-extinguishing corotron 22, so / ie a detector device 23. During operation, the & o Elements used in a known manner to uniformly charge the photosensitive, insulating coating, image-wise to expose to a latent electrostatographic image in the coating to produce this image with Tö « nungsprtikoln to develop and the developed image on a To transfer paper advancing into contact with the drum will. The paper provided with the image is then removed, and the image is applied by means of heat through a suitable Device 26 is fixed on the paper and the paper is then conveyed into a container 27.

The xerographic apparatus of the vorunceciongenen T * 'ps generally contains a number of detector devices to indicate various operating conditions. Thus is used a designated in Fig. 2 at 31, schematically illustrated suitable detecting means to detect the state of the Papierverklemmung when the paper moves along a path. The apparatus may also include means 23 for determining whether the paper is still adhering to the drum instead of the removal or removal step having been performed by the removal corotron 18. More generally, the failure condition may be due to a failure of the operational parts, such as when the scanner fails to complete its normal scan and cycles back during a copier operation. Referring to Figures 3 and 5, a failure condition may be that the scanner does not complete the scan, but repeats it

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can be determined as follows:

The apparatus may have a scan or home run switch 33 with switching means. The switching device can have contacts 37 and 37 which ^{briefly close at the beginning of each start of the defrosting cycle 1} when the scanning device 13 touches them for a moment (FIG. 5). According to a feature of the present invention ^w ^ ^r d the fact that the scanning device 13 to the home position switch at regular time intervals in synchronization with each sampling cycle closes and opens, used to scan the time control signals to various elements of the control circuit and various operational parts of the machine to monitor or control. Therefore, if the scanner fails to close the run home switch 33 at the expected regular time interval, the control circuit interprets this as an indication of a malfunction of the machine. Certain logical networks, which are provided in the control circuit, then interpret the error and interrupt the machine run.

For the sake of simplicity and for the reasons given above, the jammed paper condition, the paper failure condition or, more generally, the scanning device error, summarized and considered the jammed condition of the apparatus in general. Therefore, when the jammed state is used in the following description, it is intended to include not only the paper jammed state or the acceptance jammed state, but also other impracticable or abnormal ones as well Scan and reverse operations that result in the failure of the scanner, thereby completing the scan cycle.

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In connection with this application, a "copy run" means a perfect cycle beginning with the machine starting, going through a number of copies, and stopping the machine. In connection with the present machine this means that the operator sets a number on the dial for the number of copies, the print button presses and receives a number of copies. The machine stops automatically after the copy run *

The term "staggered calculation scheme" referred to in this application indicates a suitable arrangement with which the number of copies of successive copy runs is recorded, with different calculation rates being used for the copies, depending on the number of copies per copy run. Such a scheme is disclosed in the American patent application (Serial HoJ D / 73185 / of .21.3.1973) ". In this system a number of counters are used The second counter records cumulatively the number of copies made up to a certain maximum number, e.g. 6 copies. A third counter records cumulatively the number of copies that are above this maximum limit, ie 7 copies or more in the example above, the counts up to the first cap will be charged at an appropriate rate and the counts above the cap will be charged at a cheaper rate.

The apparatus is provided with a closure 41 (Fig. 3) so that the operator can open the apparatus. The shutter includes a shutter switch 42 which switches between a change

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power supply and certain parts of the machine are arranged, so that the operator can safely open the machine to clear the fault condition. According to Fig. 1, the control panel contain a number of manually operated pushbuttons, such as a push button 51, a stop button 52 and a display window 54 in which appropriate information is illuminated can to get a visual indication of machine conditions to accomplish. The console can also have an arrangement 43 with a certain number of separate dials for the number of copies, such as disks 47 and 48 for tens and units, respectively, which the operator can use to control the machine preset for the desired number of copies. The machine is also equipped with a device for displaying the invoice amount, the several counters 57, 53 and 59 which are assigned to a staggered calculation scheme of the machine.

The control circuit of the present invention interacts with various inputs and outputs mentioned above and various machine elements involved in running the machine. According to FIG. 6, the "start" or "print" signal 62 and the "stop" signal 63 can be present at manual input signals for the control circuit, which are triggered by the operator, as well as a ^{ll number of} copies "signal 65, which comes from the amount dials. the control circuit also processes those signals indicative of a fault condition, and provides appropriate output signals to the operator. Thus, the machine, for example, can emit a fault signal 66, the state of the Papierverklemmung or lack of paper loss or erroneous function of the scanner; this signal indicates that the machine is not malfunctioning

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One type of input signal for a fault condition is the paper supply signal 67, which indicates when the paper supply on the paper support 68 (Fig. 1) runs out while the machine is making a predetermined number of copies according to the setting of the copy amount dials. Another input signal processed by the control circuit is the signal 67, which indicates a fraudulent influence if the operator pulls down a lever, not shown, which is coupled to the paper carrier, thereby simulating the state of the lack of paper supply and enjoying a lower display of the counters 57, 58 and 59 of the staggered calculation scheme.

The control circuit of the present machine is designed so that when a fault condition is detected, the machine cycle interrupts. During the interruption, the control circuit causes the visual indicator 54 to light up, the has several separate lights to identify the type of failure condition, i.e. exit of paper or jam condition. The machine is designed in such a way that the operator only has a detected jamming condition must eliminate or, in the case of paper output, this must first be refilled before the control circuit starts again the machine allows. More specifically, the control circuit is designed so that in the deadlock condition, the operator the shutter 41 (Fig. 3) and the machine must open, eliminate the fault condition and then close the machine again got to. Only then will the machine start again on a corresponding command ^ Jer by pressing the push button. the Control circuit is designed so that during the interruption

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as a result of the deadlock or the lack of paper supply the power supply for certain parts of the machine is maintained; so for the counter 89 so that the counter reading reached up to the point in time of the interruption is not deleted. This represents the uniformity of the calculation scheme secure.

There are a number of other features of the present control circuit which will now be described since understanding thereof will benefit an understanding of the overall control circuit. The control circuit uses many logic elements organized into a number of logical networks. Many of the logic elements are involved in different logical networks. The logic elements can be of conventional types such as AND, OR and NAND gates, as well as LATCH or FLIP-FLOP circuits. They are used in a conventional manner. Some of the logic circuits, although shown as a single block for the sake of simplicity, for example in FIG. 7k , contain many conventional logic or circuit elements which are put together to achieve particular functions to be described. Figures 7B and 7C illustrate other examples of logic circuits. For example, a combination of optical coupling (light-emitting diode and photo-Darlington transistor) and triac can advantageously be used as a switch for switching the alternating current supply to the motor on and off, as shown schematically in FIG. 7B. Such a circuit is disclosed in the American patent application No. D / 73144 of 8.3.73. The arrangement of light emitting diode and photo darling to. -Transistor can also be used as light coupling between different detector elements /

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such as the deadlock detector. or the; Locking detector, and logic elements such as a LATCH circuit or a FLIP-FLOP, as shown in Figure 7C.

Different pulse trains are generated by the timing signal generator; they are used as copy counting pulses for the copies made or as a time control for the keying of certain logical networks and the like. The timing signal generator supplies Ircpulse chains, whose creation is sent to the. Actuation of the sampling switch 33 and / or certain other circuit elements is bound and delayed by a predetermined amount compared to the actuation of the linked elements. Fig. 3A shows an example of a pulse generator used as a timing signal generator. It contains a binary counter consisting of a number of FLIP- FLOPs ah, which are connected in a chain in order to count pulses from a clock generator. To generate the copy counting pulses (Fig. 8 C) ₁ . which represent the number of copies made, the outputs £, £ _f d, Jh of the Q lines of the first FLIP-FLOP a, the third c, the fourth d and the last h are connected to a NAND gate 101. In operation, all of the FLIP-FLOP's a, b, c, d / e # f # g and h are reset every time a sampling pulse is applied from the sampling switch. The FLIP-FLOPs count the 60 Hertz (mains frequency) clock pulses after each reset and generate a Q pulse as a counting pulse. The last two FLIP-FLOP 'sg and h are also under the influence of the deadlock signal, which is connected via an OR gate 103 from a deadlock signal line 104 to their reset lines. The FLIP-FLOP's are controlled by the 60 Hz clock and the outputs of the FLIP-FLOP's a, b, c, d, e, F, g and h switch to logic 1 if they are in the sequence as a response

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the clock pulses are set. When a deadlock condition occurs, the deadlock detection device detects this and supplies the deadlock signal to the FLIP-FLOPs g and h through the OR gate 103. As a result, the FLIP-FLOP ¹ S g and h are reset and remain in this status for so long held as long as the deadlock signal is present. This has the consequence that the input h of the NAND gate 101 remains at logic 0. As long as the deadlock signal is present on the line 10-i, the NAND gate 101 cannot generate a clock pulse, although the inputs a, c and d become logical 1 when the ÖO Hz clock increases and the FLIP-FLOPs a, c and d sets.

The foregoing is shown in Figures 8B and 8C. In the following, reference is made to FIGS. 8B-8C. After a warm-up time & t after the push button has been depressed, the scanner 13 scans successively at regular time intervals. As a result, the sampling switch 33 generates a train of sampling pulses S 1, S 2, S3 (FIG. 8B). The FLIP-FLOPs are reset by each sampling pulse. After resetting, the FLIP-FLOP's a, b, c, d, e, f, g and h are preset in successive order in response to the incoming pulse train of 60 Hz clock pulses from the AC power supply. Yet a certain number of the 60 Hz pulses, that is, after 141 pulses after the reset of all flip-flop ¹ S were counted, all inputs a, c, d and h of the NAND gate 101 to a logic. The NAND gate then generates a counting pulse Ci, unless a deadlock ^{condition occurs, by which the FLIPFLOP 1} sg and h are held in the reset state and thereby prevent the generation of a counting pulse C 1. The foregoing is repeated in order to generate a chain of counting pulses C1, C 2, C (FIG. 8 C) in response to the scanning pulses S1, S 2, S3, etc.

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create.

The NAND gate 101 is therefore used as a time delay circuit, the amount of time delay between an input sampling pulse and an output counting pulse, for example between the pulses S1 and C1, depends on which of the outputs of the FLIP-FLOPs ah is used as an input for the NAND gate will. In addition, it follows from the circuit that pulse generation at every predetermined time interval after the chain counting of the 60 Hz clock pulses has been disrupted can be prevented by holding selected FLIP-FLOPs in the reset state so that they are not affected by the 60 Hz clock pulses can be set. This is illustrated in the circuit described, where the deadlock signal, in the form of a logic 1, is applied to the FLIP-FLOPs g and h in order to reset them so that the clock pulses cannot clock the FLIP-FLOPs g and h and thereby prevent the NAND gate 101 generates a Zähliirpuls.

The functional and operational characteristics of the control circuit according to the present invention are intended to be brief will be described in connection with FIG. As roughly shown in Fig. 6, the control circuit contains in the functional sense a clock 81 which receives the basic time information from the 60 Hz AC power source derives; a frequency other than 60 Hz could also be used. The circuit has timing generator logic 82, which by and large uses the basic clock signal from the clock generator 81 and the sample signal 78 to derive a variety of different timing signals 83 for normal machine operation. The circuit possesses also an interrupt logic 84. The network 84 responds

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to certain fault conditions mentioned above and interrupts the normal operation of various machine elements 87 via a suitable intermediate circuit 85. The timing generator logic 82 enables via the intermediate circuit 85 that the copy counter 89 the charge counters 90 continues. In response to the fault signal, the interrupt logic 84 stops the copying process and holds the counter 89 and the charge meters in a static state so that after the fault condition has been eliminated the actuation of the charge counter can be continued as long as no interruption occurred during the copy run were. This is to ensure the consistency of the copy count and to give the customer the lower one To give the calculation rate to which he is entitled. The machine will resume copying, provided that the Fault has been eliminated. Logic 82, 84 and 85 ensure that meter 89 and billing meters 90 are correct Display the number of copies corresponding to the copies actually ejected from the operator; these Logic also ensures that the copies are counted according to the staggered calculation scheme. The logic also provides determines whether there is fraudulent influence, if necessary stops the machine and sets the counting device and the graduated billing meters so that the calculation for the additional copies - after restarting the machine to complete the original copy run - to

higher calculation mode returns.

FIGS. 9 A and 9 B, assembled according to FIG. 10, show a detailed block diagram of an embodiment of FIG

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Control circuit according to the present invention. The circuit is described below in its normal mode of operation, in Interrupt operation as a result of a deadlock or insufficient paper supply as well as in such a situation Function described, which occurs when the machine is influenced to fraudulently use the staggered calculation scheme to take advantage of.

A. Normal operation

For normal operation, the control circuit having a functional logic network, which is used to counting means 89 and the charge counter 90 continue to switch the staggered calculation scheme as a function of successive sampling pulses. The logic network contains the sampling switch 33, a time delay circuit TD 1 in the timing generator 82, and an AND gate 110. A start chain is provided for starting the machine, the counting device and the charge counter. The chain contains the push button 51, the AND gate 113, a start logic 114 and an AND gate 115 which, as shown, are connected to form a chain. The output of the start logic 114 also serves to st ¹ S und.120 a presetting / reset logic 117, an OR gate 118 and the flip-flop th _ar. This is done, as shown in the following, certain by imitation Functions. The preset / reset logic is connected to machine element storage logic which energizes and actuates a number of machine elements of the copier. The machine element storage logic is triggered when the presetting-ZResetting logic 117 is preset by the start signal from the start chain; this happens cds response to the pressure signal from the pressure

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Button 51 via chain elements 3, 114 and 117. The machine elements connected to the machine element memory logic can be a number of operable elements present in machine 124. It can, _for example, the developer, the exposure lamp, a main motor for driving various moving parts such as selenium drum, the Abtastantriebs, the paper feed, etc., as well as the high voltage supply, act dio AC power supply, etc.. The machine element memory logic 123 may be made of any suitable design, such as a series of FLIP-FLOP ¹ s exist, which include a memory, which turns in a machine cycle the corresponding programmed sequence, various elements and energized. When switching on AC loads, such as the main motor, the machine element memory logic 123 is used to set a triac switch 124 in the We ore; el st romp fad between the AC voltage source and the main motor using a light emitting diode and a photo Darlington transistor to control (see Fig. 7B).

Under normal operating conditions, the following operations take place instead of; under normal operating conditions is understood that

sufficient paper in the paper container, and that this paper is i ⁿ the correct position for insertion into the copying apparatus and that the machine is on the other hand interference. The operator places a document on platen 130 (FIG. 1) above scanner 13. He sets dials 47 and 48 (FIG. 1) to the number of copies desired. Then she presses the push button 51, whereupon the start logic and various other logic networks of the control circuit start the machine.

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set drive until the set number of copies was automatically ejected into the paper output tray 27 (Fig. 2).

Depressing the push button generates a push command signal applied to the start logic 114 via the AND gate 113.

The logic 114 in turn sends the start pulse to the preset / reset logic 117, the OR gate 118, the FLIP-FLOP 120, and via the AND gate 115 to the counter 89 and sets in motion a chain of actions. The preset / reset logic sends a signal to the machine learning memory logic 123 to initiate a chain of operations within the copying process.

The start pulse applied to DC machine power logic 133 through OR gate 118 enables the latter to connect various circuit elements of the control circuit to DC power sources through a photocoupler 126 of the type shown in Figure 7C. The start pulse given to the AND gate 115 sets the counter 09 back to a start position. This indicates that the copies to be made belong to a new copy run. The counter 89 can be made up of a suitable buffer, such as a chain of FLIP-FLOPs connected in a conventional manner to form a binary up counter _; exist.

After the push button is currently t ~ (FIG. 8 C) has been depressed and a time Δ t has passed, a scanning pulse S 1 is generated by switching on the scanning switch 33 when the scanning device 13 begins to move away from its rest position; the sampling switch 33 is turned off and leaves

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this causes the sampling pulse to decay. As indicated above in connection with the copy cooling pulse generator in connection with FIG. 8, the time delay circuit TD 1 generates the first copy count pulse Cl after a time delay period At, after a predetermined number of 60 Hz power supply pulses have been counted. In the same way, the Sampling switch 33 a pulse train Sl, S 2, S3 ..., if the Scanner 13 the switch 33 closes and opens one after the other. In response to this, the time delay circuit TD generates 1 a pulse chain Cl, C 2, C 3 ...

The output pulse train C1, C 2, C 3 ».. of the time delay circuit is given via the AND gate 110 to the copy counter 89 (the AND gate 110 allows the pulses arriving from the time delay circuit TD 1 to pass as long as they are not blocked) . The counter 89 receives the counting pulses Cl, C 2, C 3 ... from the time delay circuit TD 1 and switches the respective FLIP-FLOP ¹ S on. The states of the individual FLIP-FLOP's are applied to a programmable connection device, and the logic 136 causes the charge counters 57, 58 and 59 to advance in a certain manner in connection with pulses from a time delay circuit TD 7, as in the above-mentioned American patent application is described. The status of the copy counter, which is contained in the states of the various FLIP-FLOPs of the counter 89, is sent to a comparator 135 and via the programmable connection device with the associated logic 136 to selected charge counters. The programmable connector and associated logic 136 control

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the charge counter 57 so that the total cumulative count of copies made according to the pulses from the time delay circuit TD 7 is displayed. The logic 136 also responds to the counts of the counter 89 and switches the charge counter 58 and 59 according to the staggered calculation ι voltage scheme in the American patent application no. D / 73185 of March 21, 1973.

As described in that application, the billing meter is used to indicate the cumulative total amount of copies made. The second counter 58 shows the cumulative total amount of copies up to a maximum number, for example 6, and the third counter 59 registers the copies above this maximum number up to a second maximum number in successive runs.

When the number of copies is set on the dials Number corresponds, the machine ends its run in the following Way. The comparator 135 compares the counts of the pulses from the counter with the count information that from the copy dial setting. V / hen the Number of pulses from the counter 89 corresponds to the counter setting, the comparator outputs a "machine running off" signal Ah. This "machine running off" signal is sent via the OR gate 138 to a corresponding logic with a FLIP-FLOP circuit 120 given. The FLIP-FLOP circuit 120 in turn sets the preset / reset logic 117 via a Line 139 back. The FLIP-FLOP circuit 120 also gives its output to a blocking input b of the Utö) gate 110.

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^The AND gate 110 then prevents the counter 89 from receiving any counting pulses from the time delay circuit TD 1. The reset pre-set Z ^ reset logic 117 provides a reset signal to the machine element storage logic 123. The machine element storage logic 123 in turn causes various load elements, such as the high voltage supply for the main motor, the DC power supply, etc. to be switched off. The preset / reset logic 117 also supplies a pulse to the timing signal generator via an OR gate 172 and resets the FLIP-FLOP ¹ s ah (FIG. 3A). The FLIP-FLOP's begin to count 60 Hz pulse pulses in order to initiate a machine idle cycle. Switching off the main motor results in a logical 1 at one of the two inputs of an AND gate 171 via line 162. This AND gate 171 is used to prevent a machine dormant cycle when the machine is in the idle state due to lack of paper supply, as will be described later.

When a predetermined time has passed after the engine was turned off a time delay NAND gate 106 (Fig. 8A) a machine dormant cycle pulse to an OR gate 135. The OR gate 135 then sets the machine performance logic 133 back, and causes! The latter the DC voltage from the control circuit and thereby the machine completely matters. Switching off the DC power supply sets the counter 89, the programmable connection device and logic 136 back so that it is cleared for the next copy run and returned to the higher calculation mode will.

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B. Interrupt service

The control circuit of the present invention includes functional elements Logic networks which interrupt the normal operation described above and guide the machine through interruption procedures so that the operator can experience fault conditions can eliminate. The networks have a facility that allows the operator to restart only when if a deadlock or out of paper condition causing the interruption has caused has been eliminated, as well as a facility to set the charge meter v / uring the interruption in a static Condition and enable them to perform their function of displaying staggered counts of the copies made . as if no interruption had occurred. The network also has a facility around the machine to switch to the idle state if it was influenced to deceive the staggered calculation method. These interrupt and shutdown features will now be described.

Damping mode

The deadlock mode situation occurs when the deadlock detector 141 determines that the paper is jammed or has not been removed from the surface of the drum.

Il II

The sensed deadlock signal sets a FLIP-FLOP 119. The FLIP-FLOP 119 in turn gives its output to the preset / reset logic 117, to an input of the OR gate 118, one of the inputs of AND gate 143, one of the inputs the Nor gate 144 and to the timing signal generator 82.

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The output of the FLIP-FLOP detecting the deadlock signal is also connected to appropriate circuitry 146 in the visual indicator 54 in which a lamp illuminates to indicate to the operator that a deadlock condition exists.

In response to a sensed deadlock signal, the deadlock FLIP-FLOP asserts 119 by the control circuit a number of operations in operation. It enables the machine to perform various Circuit elements continue to be supplied with DC voltage by setting the FLIP-FLOP's 133 via the OR gate 118 The logic 133, in turn, holds the DC power supply for certain elements, such as the counter 89 and the tiered billing meters 90, upright. This enables the devices 89 and 90, their status and the counting information which are passed through them to the billing meters 57, 58 and 59 · In detail, this means by reference on Fig. 8A that prevents the flip-FLOP 119 from being set, that the NAND gate 105 of the time delay circuit TD 8 outputs its "cycle off" signal. This signal would be sent to the DC power supply logic and if the DC power supply had been removed from the control circuit, the machine would have been put out of operation and, among others, the counter 89 and the programmable connector and logic 136 cleared or postponed and thereby transferred to the higher calculation mode.

In this way, the control circuit according to the present invention prevents Invention in the deadlock mode that the machine loses the counter reading reached in the course of the copy run, while

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^e iner interruption, which was created from the clamp state hervoi *, and the circuit allows the machine resumes operation, and terminates the copy run, while the completeness of the copy counts is obtained according to the staggered counting scheme.

The output of FLIP-FLOP 119 also goes to gate 147 which is used to signal the machine power storage logic 133 and turn off the DC power when the machine is opened without being in deadlock mode. The output of the FLIP-FLOP ^J s 119 also interacts with the NOR gate 144 for normal start-up of the machine and with the AND gate 143, which is used in the start-up circuit during the deadlock mode, as follows see. The output of FLIP-FLOP 119 causes timing signal generator 82 to turn off its counters from pulse generators FLIP-FLOPs g and h (Fig. 8A) to prevent pulses from TD 1 - TD 8 from appearing. As indicated above, the suppression of TD 8 prevents the completion of power down cycle ^{1 of} the machine, and more specifically, the FLIPFLOP 133 from being set and the machine shutting down.

After the above-mentioned events have elapsed, the machine remains in an interrupted state, although the energy supply is still in place is maintained. At this point the counter is powered and it will indicate the copies, that have been made so far, including one more that was not completed, which is due to the way in which the counting pulses Cl, C 2, etc. depending on the sampling

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pulses S 1, S 2, etc. are generated as explained below. The machine cannot start again until the operator opens the safety lock 41, clears the jam, closes the safety lock 41 again and depresses the push button 51 again, which amounts to the AND gate 143 providing a start signal. Reference is made below to FIGS. 9A and 9B. Certain parts of the logic elements that are used for the aforementioned functions respond to the opening and closing of the interlock switch 42 and are reset in order to restart the machine after an interruption due to a jam. The control circuit has a lock detector 151. When the lock switch 42 is opened, the lock detector 151 provides a signal directly to the AND gate 143 and through a deadlock latch circuit 152. The output of the lock detector is also applied to a FLIP-FLOP 153. The output of the FLIP-FLOP ¹ ^ 153 is applied to a blocking input of the AND gate 115 ^ the AND gate 115 prevents a restart of the counter 89 after a deadlock condition has been cleared and the push button has been pressed, which would otherwise clear the counting memory and would have the consequence that an incorrect number of copies would be made with incorrect computation rates.

Various elements involved in the operation of the lock act as follows. As described above, in the normal operating mode the scanner delivers scanning pulses Si, S 2, S 3 etc., which the time delay circuit TD 1 in the timing signal generator 82 causes the counting pulses C 1, C 2, C 3, etc., as shown in FIG. 8. V. if a paper

A098A3 / 1006

jamming occurs or the paper has not been removed from the drum, a jamming signal which is detected by a circuit 141 is generated. Referring to FIG. 8B, assume that this occurs during the third scan cycle ^one . The third sampling pulse S 3 has already been generated since the sampling switch 33 is actuated each time at the beginning of sampling cycle ^1. The third sampling pulse S 3, which was generated by the sampling switch 33, has already set the necessary operations in motion which cause the time delay circuit TD 1 to emit the third counting pulse C, as shown in FIG. 8C and above in connection with Fig. 8A is described. At the time a deadlock is determined, the third pulse has therefore already been counted by the counter 89 as a copy counting pulse. The third count C 3 is erroneous, however, because the third copy is either jammed or not removed from the drum surface 3, or because the scanner became inoperative during the third copy cycle, with the result that the machine cannot provide a completed third copy.

In response to the deadlock signal, the FLIP-FLOP Π9 causes the preset / reset logic 117 to start the machine element storage logic 123 to shut down the engine and other operational machine elements. The FLIP-FLOP also holds the DC voltage supply logic 133 via the OR gate 118 in a hold state, as a result of which the DC voltage supply for the control circuit is maintained. This pet / tt ni? Counting device 89 and the time control signal ncm? Rcjtor f etc. in a static, not sensed state. Lic n,: srhioht before ti cm four-tone start of scanning.

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The fourth and subsequent counting pulses therefore do not appear. The counter 89, the comparator 135, 'and the charge counters 57, 58 and 59 are now held in a static, non-keyed state. As previously stated, maintaining the DC power supply to the logic elements while the machine is open, e.g. to remove a jammed copy, is made possible by the fact that the output of the FLIP-FLOP 119 is connected to the machine power logic 133 via the OR gate 118 is. The machine power logic is designed in such a way that it enables a direct current power logic 133 to continue to supply the counter etc. with direct current during the interruption if it was set by the deadlock signal via the OR gate 118. To. At this point in time, the operator is made aware of the deadlock condition by a visual indicator light 146 which lights up in response to the fact that the FLIP-FLOP 119 has been set. The OR gate 103 (FIG. 8 A) prevents the normal power-off cycle during the variable time within which a jammed copy is cleared by applying a reset signal to the FLIP-FLOPs g and h, whereby TD 8 in the timing control Signal generator and the direct application of the FLIP-FLOP 119 to the machine performance logic 133 can be prevented, as indicated above.

To remove the jamming, the operator opens the machine by opening the safety lock. This is detected by the lock detector 151. In turn, it emits a signal that the locking FLIP-FLOP 153 and the "Verklemniungs-Er! Iolungs" FLIP-FLOP 152 are set. The FLIP-i-'LOP

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gives its output to a blocking line> X of the AND gate Π and 110. These locked AND gates are used to prevent any incoming Counting pulses from the time delay circuit TD 1 of the timing signal generator 82 to it. prevent the counter 89 to switch on when the lock 41 is open.

During the deadlock interruption, the deadlock start logic prevents the machine from restarting; this logic contains the "deadlock recovery" ~ FLIP-FLOP 152, the AND gate 143 and the Nor gate 144 between the FLIP-FLOP 119 and the start AND gate 113 is arranged, as well other elements that are connected in the form shown. Fig. 11 shows a truth table showing the state of the various Inputs and outputs of the logic gates are involved in the start logic chain.

Reference is made below to FIGS. 9 and 11. Inside the start logic chain there is the logic circuit in response to a logical 1 at the output of the AND gate in the normal deadlock-free state or at the output of the Start AND gate 143, if there is a deadlock condition, an impulse. The output of the is normally located AND gate 143 is not at logic 1, since not all of its input signals are at logic 1. The normal start AND gate 113 controls the activation of the start logic 1 * 4. This is shown in Fig. 11 in the first column which denotes is: normal operation, push button pressed. In the normal case, the AND gate 143 can not have an output for controlling the Supply start logic 114, since if the deadlock does not

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state the input line m of the AND gate 143 is at logic 0. More specifically, under normal deadlock conditions, start logic 114 is under control of Nor gate 144 and AND gate 113. If either a deadlock condition or a paper out of paper condition (as discussed later) occurs, the Nor gate delivers 144 a logic 0 dai.iit to the aND gate 113 and prevents DAQ the aND gate 113 the start command from the print button 51 passes. If one of the two states mentioned occurs, the NOR gate 144 outputs a logical 1 to the AND gate 113. In this case, the AND gate 113 can forward the print command from the pressure button 51 under normal conditions. When the push button 51 is depressed, the pulse is then applied to the start logic 114 through the AND gate 113. The start logic 114 uses the start signal to enable the AND gate 115, the preset / reset logic 117, the OR gate 118, the FLIP-FLOP 119 and the machine latch or FLIP- FLOP 120 cause various machine elements to be started and work as previously written.

In the event of a deadlock, AND gate becomes 113 disabled by Nor gate 144 in the following manner. As long as the deadlock signal is present at the output of the FLIP-FLOP 119 (The same applies to the signal that indicates the lack of paper supply, as explained later), delivers the jamming ' state a logical 1 at the input of the Nor gate 1 ·! ί. The exit of the Nor gate 144 subsequently goes to logic 0 and prevents the AND gate Π3 from receiving the print command from the push button forwards ". As long as this state exists,

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the start happens via the alternative route from the push button 51 via the AND gate 143. '

The AND gate 143 only supplies a logical 1 if all of its inputs m, η, ο, ρ are at logical 1. According to Fig. Π this only happens when the machine is opened, the jamming is eliminated, the machine is then closed again and then the push button is depressed. More precisely, the start logic chain and in particular the AND gate work as follows, assuming a deadlock condition. If the signal indicating a deadlock condition is detected, the FLIP-FLOP 119 supplies a logic 1 to the m-line of the AND gate 143. However, the input of the ^II deadlock-recovery "FLIP-FLOP ^l s 152, which is connected to the input line η of the AND gate 143 is connected, is at logic 0. Therefore, the AND gate 143 cannot output a logic 1 at this point in order to start the machine, regardless of whether the input p, the one with the push button 51 is connected, goes to logic 1 or 0, ie whether the operator presses the push button or not This is shown in the two columns in FIG is pressed and not pressed once.

The operator now opens the machine lock In response to this, the FLIP-FLOP circuit 152 provides a logic 1 to the input α of the AND gate 143 and sets the "Deadlock" recovery "FLIP-FLOP on logic 1. This goes However, the output of AND gate 143 is not yet at logic 1,

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since the lock detector 151 is still at logic 0 and this arrives at the input η of the AND gate 143. After the lock is closed, the AND gate gives a logical 1 to the start circuit 114, since the three conditions: the deadlock has been eliminated (lock opened), the The lock is closed and the push button 51 is depressed, are fulfilled. The aforesaid logical operations involving the latch and the "deadlock recovery" FLIP-FLOP 152 are among those with "latch open" and "latch closed and PB" (but, push-button not pressed) designated columns in Fig. 11 is shown. If the operator presses the push button at that moment 51 depressed, it supplies the fourth and last required logical 1 to the input ρ of the AND gate 143. If you press the push button, the input ρ goes to logic 1, and thus all inputs m, η, ο and ρ are located to logic 1, as shown in the last column in FIG which is labeled "latch closed and PB" (push button pressed). The AND gate gives 143 in response a start pulse to various elements of the control circuit and thus starts the machine. Subsequent to this Pulse the normal start signal is generated by the AND gate 113, which is also based on the fact that the push button is still is operated when the FLIP-FLOP 119 is reset. The machine then completes the interrupted copy run, and the counter 89, as well as the staggered count indicator 90 resume operations and complete the counting and recording functions assigned to them the number of copies according to the staggered

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Calculation method as if no interruption occurred.

Counter equalization

It should again be pointed out that the logic control circuit of the present invention controls the count, the vird registered by the counter, balance, as well as the completeness of the output calculation as well as that allowed calculation scheme.

409843/1006

With reference to the mode of operation of the control circuit in the event of the deadlock condition, it should be remembered that that the counter has registered one more pulse than corresponds to the number of copies output; this is based on the time relationship between the generation of a count and the time a deadlock is detected. Therefore used the circuit according to the present invention has certain logic elements to prevent the counter 89 from the first Counting pulse (i.e., C 4 in the above example, Fig. 8C) coming from timing signal generator 82, the counter 89 reached. This is done in the following way.

The operator removes the failure conditions, i.e., them opens the machine, clears the jam, closes the machine and then depresses the push button 51. Thereupon AND gate 143 actuates start logic 114 to generate the start signal output as explained above. It should be noted once again that the locking FLIP-FLOP 153 with opening

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- co -

the machine has been set. The FLIP-FLOP 153 then delivered a blocking signal to the AND gates 115 and 110. As a result, the AND gate 110 is prevented from forwarding counting pulses from the time delay circuit TD 1 to the counter 89. This lockout signal is removed after the deadlock condition has been cleared, the machine closed, the push button depressed, and after a suitable amount of time delay has elapsed. The time delay is introduced into the timing signal generator by the time delay signal from a suitable delay circuit TD 3. TD 3 provides a reset signal to the latch FLIP-FLOP 153 after a predetermined number of 60 Hz pulses; the flip-flop 153 is in turn from an output that allows a logical! signal from the gates 115 and 110 * The time delay of TD 3 is set so that the signal after the time appears to the first count after recovery of the FLIP-FLOP 119 would appear. Therefore, if the operator depresses the push button after the jam has been cleared and the lock has been closed, this immediately starts the other switching elements including the scanner, so that the scanner starts to end the remaining cycle and return to the starting point at switch 33, to close this and thereby ^ to generate the first sampling pulse S 4 (Fig. 8 B). The time delay introduced by TD 3 is chosen so that the disable signal which is applied from the output of FLIP-FLOP ¹ S 153 to AND gates 115 and 110 is not canceled before the time at which the fourth pulse C 4 appears would. as

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The result of this is the fourth pulse C 4, which is shown in dashed lines in FIG. 8C and that in response to the 'fourth sampling pulse S 4 of the sampling switch from the time delay circuit TD 1 is generated, prevented from reaching the counter 89 through the gate.

It will be recalled that the control circuit of the present invention prevents the meter 89 and the charging device 90 from being disconnected from the DC power supply during the interruption. This is ensured during "deadlock" operation by the fact that the signal from FLIP-FLOP 119 provides a reset to OR gate 118 and machine power FLIP-FLOP 133 as long as the deadlock has not been cleared. The signal which would result in an immediate shutdown of the machine power supply if the lock were opened without a deadlock condition existing is prevented from passing through gate 147 to machine power logic 133. As indicated above, the signal which is responsible for switching off the machine and which would be generated by the time delay circuit TD 8 and would pass through the OR gate 137 to the logic 133 in order to switch off the direct current from the control circuit is prevented from being generated by the deadlock signal which reaches the FLIP-FLOP ¹ S g and h (FIG. 8 A) via the line 104.

If there is no jam and the machine is opened, the gate 147 provides a signal for switching off the

409843 / 100S

Machine to OR gate 137 and then to machine power logic 133. This turns off DC power 125, clearing the memory in counter 89 and the programmable connector and logic 136. In addition to other machine outputs, the machine output logic 133 completely switches off the main motor via the photo-detector arrangement. Such a photo-detector arrangement is disclosed in American patent application No. D / 73144 and is briefly described in connection with FIG. 7B above. As a result, when the machine is started again, the counting device 89 and the logic 136 advance the charge counters 57, 58 and 59 according to the higher calculation rate, as in the case of a new copy run.

The control circuit contains a logic circuit, s 161, which is only then supplies a start or reset signal to the FLIP-FLOP 153 when the push button is pressed after previously the machine power supply had been switched off as a result of the normal machine switch-off cycle *, or when the machine was opened when there was no deadlock. Circuit 161 is also used to reset a FLIP-FLOP 162 that is used in the out of paper mode. The circuit 161 differs from circuit 114 in that it contains certain storage elements, such as FLIP-FLOPs 151 and 162, which cannot be restarted after a deadlock condition has been cleared, but instead the start of which must be delayed, e.g. in order to count the number of copies

409843/1006

with the copies issued.

Operating mode if there is no paper supply

In accordance with another aspect of the present In accordance with the invention, the control circuit includes a chain of logical networks for interrupting machine operation in response the condition of the lack of paper supply and, in order to enable the machine to be restarted, to initiate the copy run stop when the paper has been refilled and the push button has been pressed again. The control circuit also has a Chain of logical networks to determine if the paper feed has been fraudulently ^ manipulated and in order to to end the copy run and to switch the display device 90 of the staggered counting to the higher calculation rate.

The logical networks for the operating modes in the event of a lack of paper supply or fraudulent influence include AND gates 164 and 165, a (paper supply recovery) FLIP-FLOP 162, time delay circuits TD 4, TD 5 and TD 6, and switch 167 for detection the state of missing paper supply, which can be implemented in a suitable manner and switched on in the manner shown. The time delay circuit TD 4 supplies an interrogation pulse to the AND gate 164 to determine the status of the lack of paper supply. An interrogation pulse appears during each scan cycle ¹ , with each pulse appearing at nearly the end of each ^{scan cycle 1} , as shown in Figure 12B. Everyone who asks impulses

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in the following way whether or not a missing paper condition has occurred: The interrogation pulse is to a of the two inputs of the AND gate 164 is applied. The second input of AND gate 164 comes from switch 167. One suitable device, such as a micro-switch, is in the A receptacle is provided for the paper entering the machine to determine if there is no paper. When such a condition is detected by the switch, it provides an output which is applied to the AND gate 164. The state missing Paper supply is visually indicated by the lamp 175, which is arranged in the visual display area 54 (Fig. 1) is.

A logical 1 at the output of the gate 164 sets the FLIPFLOP 162. The output of this FLIP-FLOP 162 changes with it from logic 0 to logic 1. This change sets a number of chain reactions, including the mode of operation of the missing Paper supply in progress, which interrupts the machine in the manner described below, so that the paper is replenished can be. In the event of a lack of paper supply, no steps are required to set the counting device 89 with the output copies, as was the case with the deadlock mode, as in this one If both coincide. This is because the time relationship of the counting pulses (Fig. 12 B) with respect to the Signal that indicates the lack of paper supply (Fig. 12 D) and to the interrogation pulses (Fig. 12 C) to determine whether Paper missing is such that the number of copies counted

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and the number of copies output is the same.

As shown in FIGS. 12 B and 12 C, each of the counting pulses C 1, C 2, C 3 ... from the time delay circuit TD 1 appears a little before each of the interrogation pulses Pi, P 2, P 3 ... coming from the delay circuit TD 4 come. The operation of the paper feed mechanism and that of the switch 167 for detecting the condition of the lack of paper are related to one another in such a way that the signal for the lack of paper (FIG. 12D) is registered before the interrogation pulse appears at the end of each cycle ¹ .

It is assumed that a lack of paper is detected during operation at time t 1 after the third scanning cycle will. The next interrogation pulse P 3, which immediately follows the lack of paper signal, causes the AND gate emits a signal (logic 1) as a result of the coincidence of the both entrances. Thereupon the FLIP-FLOP 162 gives a blocking signal to the blocking line B of the enabling the counting AND gate 115 that switching off the DC power supply prevented. This lock remains until a reset signal reaches the FLIPFLOP 162 via a time delay circuit TD 5 after the paper supply has been filled and the Machine was restarted. As a result, the start pulse that arrives at AND gate 115 via gate 114 becomes there prevented from resetting the counter 89. This prevents the programmable connector and logic 136

started and returned to the higher calculation rate. More precisely, the lack of paper logic allows a re-

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Start of operation of the counter 89 and the logic "36", based on the copy count or the calculation type that existed during the time in which the last copy sheet was printed from the input tray If the machine is interrupted due to a lack of paper, the completeness of the count is maintained, ie the memory in the counter 89 and the programmable logic 136 are not cleared during the interruption. In response to the logic signal from the FLIP-FLOP 162, the FLIP- FLOP 120. This causes the preset / reset logic 117 to shut down the machine elements, such as the motor, via the machine element memory logic 123, in a sequential manner which has an output at the input £ of the AND Gate 171 via the path 162. This input, in conjunction with an input from the FLIP-FLOP 162, which at the second input fc> of the AND gate 171 is applied so that the AND gate 171 receives a logic 1 at the output. This logical 1 is given to the machine time control counter (FIG. 8 A) via the OR gate 172 and thus holds all of them. FLIP-FLOP's in the reset state, whereby the generation of any machine time control signal is prevented as long as the paper supply has not been refilled and the push button has been pressed. This logical 1 is there until the FLIP-FLOP 162 is later reset. As a result, TD 8 is prevented from delivering a pulse that causes the Maschincnleistungslogik 133, the DC power supply during the variable time period in which the paper supply is replenished, turns off.

409843/1006

The output of the FLIP-FLOP 162 starts the machine switch-off cycle, when the FLIP-FLOP from the output of AND gate 164 is set. However, the cycle does not end, and the machine is switched to an interrupt mode in that the two signals, one of the shutdown of the main motor and the other from the output of the FLIP-FLOP 162 via the AND gate 171, generating an output of the Time delay circuit TD 8 prevent the line performance logic 133 would switch off via the OR gate 118. As a result, the counter 89 and the programmable Connector and logic 136, as in the case of the deadlock mode, prevented from reverting to the initial count and the higher computation rate.

While the switch 167 for detecting the paper shortage state continues to detect such a defect, the NOR gate 144 continues to supply a logic 0 to the in the start circuit Start AND gate 113. This prevents the operator from operating the machine again by pressing the push button start before the paper is replenished. After the paper container 68 (Fig. 1) is lowered, again with paper has been filled and returned to the paper removal position, the switch 167 changes the paper shortage signal to a logical one at the entrance of the Nor gate 144.

At this point the Nor gate 144 no longer locks. If therefore the operator depresses the push button 51, it provides a pulse to the logic 114 via the AND gate 113.

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The logic 114 in turn sends a signal to the presetting / Reset logic 117, OR gate 118, and LATCK 120 for the machine switch-off cycle and resets this for a restart of the copier mode. The main engine will re-energized in response to the start signal sent to the machine element storage logic 123 via the preset / reset logic 117 is applied. After an initial delay period at the start of each copy run occurs to bring the engine up to working speed, etc., the scanning device 13 starts to scan, and successive scanning pulses S 4, S 5, S 6 are transmitted each time, as in the normal operating mode, when the switch 33 is operated. The time delay circuit TD 1 then delivers successive counting pulses C 4, C 5 ... which are then applied to the counter 89 via the gate 110 in the manner previously described.

In accordance with another aspect of the present In the invention, the control circuit comprises a time delay circuit TD 5, which the FLIP-FLOP 162 resets so that a logical 0 appears at its output. This logical 0 reaches the gate 115 and thus removes the blocking signal which is transmitted via the line j> plant. This allows the machine power logic 133 to run after the completion of the Copy run is set via the OR gate 135 and the machine is switched off as a result.

Mode of operation in the event of fraudulent influence on the machine

According to a further feature of the present invention, the control circuit has a device which determines

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whether the operator tries to influence the machine via the paper supply container and thereby deceive the display device 90 for the staggered counting in order to obtain a lower calculation rate. One possibility of attempting fraud by the operator, if he has recognized that the control circuit of the present machine has a detector for detecting a paper shortage, is that the paper container is lowered in order to operate the switch 167 for the detection of the paper shortage and thus the To convert the machine to a paper shortage interruption mode in order to achieve a lower calculation rate. In detail, the operator can try to achieve this result in the following way. First she sets the dials to a high number (e.g. 20) "for a copy run so that the machine does not stop until 20 copies have been made. The operator then presses the print button and waits for the machine to make 8 copies so that the counter 58 for the higher calculation rate has already switched off and the counter 59 for the lower calculation rate has started to count Determine the out-of-paper condition and put the machine in the interrupt mode for this situation, the operator would then

place another original on the plate, move the paper tray back to its starting position, press the push button down

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press and then end the copy run; as far as the machine is concerned, these operations are referred to as "a single copy run." taken with an interruption due to lack of paper supply. Therefore, all remaining copies up to the 20th are made according to the lower calculation scheme.

According to the invention, the control circuit has a device which detects the false paper shortage state and can distinguish it from the true one. Referring to Figures 9A, 9B and 13AG, the fraud detection means includes AND gate 165 and time delay circuit TD. Time delay circuit TD 6 provides an interrogation pulse with each scan cycle whose pulse width is from the end of the scan pulse extended to the point at which the normally occurring paper shortage condition would be detected _t (Fig. 13 B, t,) ►

The pulse length of this fraud detection signal from the time delay circuit TD 6 is long enough to cover a very substantial part of the sampling cycle ¹ , as shown in FIG. 13C. If the AND gate 165 detects a coincidence of the two inputs, i.e. the interrogation pulse for the fraudulent influence and the paper shortage signal from switch 167, artificially generated by the operator, and if this happens at any time during the pulse from TD 6 (Fig 13 F), the AND gate 165 then supplies a logic 1 via the OR gate 138 in order to switch off the machine via the LATCH circuit 120. In response, the LATCH circuit 120 resets the preset / reset device 117, which in turn thereupon

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the operating elements by actuating the machine element storage logic 123 turns off. The preset / reset logic 117 also provides a pulse to the OR gate 172. As TD 8 will respond to the pulse from O.DER gate 172 as a A predetermined time delay is generated which sends a reset pulse to machine power logic 133 via the OR gate 135 to turn off DC power from counter 89 and logic 136; the staggered Counter 90 is on a starting state or the higher calculation method deferred.

The distinction between the signals for the legit-men Paper shortage and the illegitimate paper shortage will be short said, achieved by having 2 paper switch interrogation pulses .different pulse lengths at different times in the Occur with regard to the generation of a sampling pulse.

According to another aspect of the invention, the pulse length of the interrogation pulse generated by the time delay circuit TD for detecting a fraudulent influence is supplied, preferably much longer than the normal paper shortage interrogation pulse chosen (see Fig. 13 C - 13 E), and both are temporally such that they do not overlap. As a result, there is a likelihood that the operator will Lowering paper containers during the short period of time associated with the detection of a legitimate paper shortage, practically 0. Likewise, the probability is that a human operator will use the device for detection overcoming fraudulent influence. On the previous

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said way prevents the operator from a lower calculation rate obtained by attempting to create a paper shortage situation in the future.

In the event that the last sheet of paper entering the machine is also the last desired copy, the digital compare logic 89 compares the dial setting and the copy counter 89 at some point prior to the generation of the abbreviated shutdown cycle or start an interruption operation due to a lack of paper. In this case, a full and normal machine shutdown cycle occurs with the paper shortage indicator kept energized until machine power is shut down via machine power logic 133. In the foregoing a control circuit in conjunction with a specific & us guide die of the principles of the present inventions has been described. Many other modifications and changes can be made to the invention described without departing from the scope of the invention.

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Claims (11)

.49- 24H792 Claims MIj / Kopier-ZDuplicating machine with staggered copy counting and display devices having a first counter for displaying copies up to a predetermined number and one have a second counter for the display of copies above the predetermined number, and with a device for detection an actually occurring state of insufficient paper supply during a copy run and for interrupting the Operation in the machine, the counting and display devices and transfer to the interruption mode, with the Paper supply renewed and copying, counting and display can be resumed to end the copy run, characterized by a detector (167) for detecting the artificially induced state of missing paper supply and for generating a "paper supply all" signal, means (165, TD 6) for determining from the nature of the "Paper supply all" signal, whether this indicates the actual or an artificially induced state, and for generation a first signal indicating the actual condition and a second signal indicating the artificially induced one State indicates means responsive to the first signal to set the machine and the counting and display devices (G '?, 90) in « to set the interrupt mode and means (138, 120) responsive to the second signal and the copy run ends, which makes an attempt to stagger the dio «· 409843/1006 .50- 24U792 Counting device by introducing an artificially generated "paper supply-all" status is prevented. 2. copier-duplicating machine according to claim 1, characterized by a device (31) for detecting a jammed state and for creating an interrupt signal, by a circuit which, based on the interrupt signal, the machine and the counting and display devices (89, 90 ) is set to the interrupt mode, and by means of a detection of the removal of the deadlock condition which caused the interrupt, which enables the apparatus and the counting and display means (89, 90) to terminate the "copy run." 3. Machine according to at least one of claims 1 or 2, characterized by a scanning device (13) which operates in successive cycles at regular time intervals, a device (33, TD I) - which, depending on the operation of the scanning device (13) a Chain of counting pulses (C 1, C 2y C 3 ...) generated, the counting and display devices (89, 90) counting the chain of counting pulses (Cl, C 2, C 3 ...) and the amount of the pulses as the amount of copies made by the machine, the scanning device (13) and the device for generating the counting pulses (33, TD 1) also stopping when a deadlock signal occurs, the device for generating the counting pulses (33 , TD 1) generates one pulse more than corresponds to the number of copies actually made, and by means (110, TD 3) which blocks the first pulse of the chain of counting pulses after the machine has resumed copying has what makes the 40 9 843/1006 2AU732 the number of copies displayed by the display device (90) corresponds to the number of copies actually made. 4. Machine according to at least one of claims 1-3, characterized by means (23) for determining whether a sheet being conveyed has been erroneously not removed from the image surface (3) the machine has been removed and which generates an interrupt signal. 5. Machine according to at least one of claims 1-4, g e k e η n ~ draws through a detector '(167) showing the state detected the missing paper supply and generated an interrupt signal. 6. Machine according to at least one of claims 1-5, g e k e η η records by a safety lock (41), by a device (151) which, when the safety lock (41) is opened interrupts the power supply for the machine for safety reasons and to remove a jammed sheet of paper, wherein the device which enables the resumption of the copy run has a coincidence gate (143) which only then opens a command signal to resume copier operation reacts when the safety lock (41) is opened, the deadlock eliminated and the safety lock (41) closed again. 7. Machine according to claim 6, characterized by a device (147, 123) for switching off the counting and display devices (89, 90) when the safety lock (41) is opened without an interrupt signal being present. 8. Machine according to at least one of claims 1-7, with a 409843/1006 24U792 Device for presetting the number of copies to be produced in a copy run, characterized in that that the facility that decides whether the condition of missing paper has actually occurred or is artificially created, has the following circuit elements: A first coincidence gate (164); a second coincidence gate (165); a connection which applies the signal indicating the lack of paper supply to the first coincidence gate (164) and the second coincidence gate (165); a device (TD A) for generating a first train of pulses (P 1, P 2, ...) and for applying these pulses to the first coincidence gate (164), this first pulse train (P 1, P 2, ...) is synchronized so that the pulses occur in the same sequence in which the paper sheets are fed, and the pulses of the first pulse train (P 1, P 2, ...) occur in such a time pattern that, if the state of missing paper supply actually occurs and is detected, one of the pulses (P 1, P 2, ...) coincides at least partially with the signal which characterizes the missing paper supply, and occurs in the case of the actual state of missing paper supply; and means (TD 6) for generating a second pulse train which is applied to the second coincidence gate (165), the second pulse train being synchronized with the feed speed of the paper sheets, but with respect to the first pulse train (P 1, P 2, ...) is staggered in time, so that the second pulse train does not overlap with the first pulse train, and wherein the pulses of the second pulse train so are time that when the state of artificially generated lack of paper supply occurs and is detected, one of the pulses of the second Pulse chain, at least in part 409843/1006 2AU792 coincides with this artificially generated signal, so that the first coincidence gate (164) the actual state missing paper supply and the second coincidence gate (165) detects the artificially generated state. 9. Machine according to claim 8, characterized by a device (162) which, depending on the output of the first coincidence gate (164) interrupts the operation of the machine, so that the machine can be restarted after the paper supply has been replenished by a Device (138, 120), which depends on the output of the second coincidence gate (165) - the machine run ends. 10. Machine according to at least one of claims 8 or 9, characterized characterized in that the device (TD 6) for generating the second pulse chain generates pulses which one have considerably longer pulse lengths than those of the first pulse chain in order to enable the coincidence gates to distinguish (164, 165) between the signals representing the actual or identify the artificially created state of lack of paper supply, to improve. 11. Machine according to at least one of claims 1-10, characterized by a container for the paper supply, which is arranged at a first location from which the sheets are automatically fed, and which can be moved to a second location for filling, wherein the detector (167) is arranged such that it detects the zugoführte paper and a signal when the last sheet has been removed, and wherein the detector (167) except spine, the movement of the container is first position to the zv / OITE position during a Machinery--· 403343/1006 detected during the run and generated a signal that resembles the artificially induced Indicates the state of missing paper. 409843/1006 si Blank page