SU1131806A1 - Device for controlling sticking of paper sheets - Google Patents

Abstract

1. A DEVICE FOR CONTROLLING THE DOUBLE OF PAPER SHEETS, having a light source and a photoelectronic receiver located on opposite sides of the trajectory of the paper sheets and optically interconnected, a DC amplifier whose input is connected to the photoelectronic receiver, the comparison of voltages, the first input which is connected to the output of a DC amplifier, and a pulse duration selector, characterized in that, in order to increase the control accuracy by eliminating the effect of changing the level of extraneous The wires, the driver of the control signals, the modulator, are entered into the device. the intensity of the light source, the sampling and storing unit of the analog signal characterizing extraneous illumination, and the blocking circuit, the input of the driver of control signals is connected to the output of the direct current amplifier and the input of the block of sampling and storage, the first output of the driver of control signals is connected to the control input of the blocking circuit , the second output of the driver of control signals is connected to the control input of the sampling and storage unit, the third output of the driver of control signals is connected to the control m input of the modulator of the intensity of the light source, the fourth output of the control signal generator is connected to the second input of the blocking circuit; the output of the sampling and storage unit is connected to the input of the voltage comparison circuit. the third input of the blocking circuit is connected to the output of the voltage comparison circuit, and the output of the blocking circuit is connected to the input of the pulse width selector. 2. The device according to claim 1, characterized in that the driver of the control signals consists of a voltage comparator connected in series, two NOT circuits, a single-oscillator and two RC circuits, the input of the voltage comparator being the input of the driver, the output of the comparator is connected the input of the first NOT circuit, the output of which is connected to the input of the first RC circuit, the output of which is the first output of the driver and simultaneously connected to the input of the one-oscillator, the output of which is the second output of the driver and is connected to One of the second circuit is NOT, the output of which (L is the third output of the driver AND is connected to the input of the second RC circuit, the output of which is the fourth output of the driver. 3. The device according to claim 1, characterized in that the blocking circuit contains RSj trigger and circuit 2I-NOT, the 5 and R inputs of the trigger are respectively the first and second inputs of the blocking circuit, the Q output of the trigger is connected to the first input of the 2I-HE circuit, the second input is the third input of the blocking circuit, and the output of the 2I circuit NOT a 00 block circuit output. o 4. The device according to claim 1, characterized by O5 in that the pulse width selector consists of two NOT circuits and an integrating RC circuit, the input of the first circuit is NOT the input of the pulse duration selector and connected to the output of the blocking circuit, the output of the first circuit NOT through the integrating RC circuit is connected to the input of the second NOT circuit, the output of which is the output of the PULSE duration selector.

Description

The invention relates to devices intended for handling thin flexible materials, such as sheets of paper, and can be used to control the doubleness of sheets of paper (money tickets) in machines for their automatic sorting and counting.

A device is known to contain an HJ, a light source, a photoelectric receiver, a DC amplifier, a peak detector, and a voltage comparison circuit for controlling the duplicity of sheets of incomplete documents.

The disadvantage of this device is the inaccuracy in the operation in the presence of a backlight from extraneous light sources with time-varying intensity.

The purpose of the invention is to improve the accuracy of controlling the doubleness of sheets of paper |||:) n and the change in the level of illumination from constant light sources.

This goal is achieved by introducing the control signal generator; 1, the sample signal and the storage unit of the current signal characterizing extraneous illumination, the light source intensity modulator, and the blocking circuit, and the input of the control signaling generator connected to the output of the DC amplifier and the input of the block select1, and storage, the first output of the control signal generator is connected to the nerve input of the blocking circuit, the second output of the driver is connected to Yupdim input of the sample and storage unit, the third output of the imaging unit is connected to the input of the light source intensity modulator, the fourth output of the imaging unit is connected to the second input of the blocking circuit, the output of the sampling and storage unit is connected to the input of the comparison circuit of the inclusions, the third input of the circuit. the blocking is connected to the output of the voltage comparison circuit, and the output of the blocking circuit is connected to the input of the pulse width selector.

The drawing shows the block diagram of the device.

The circuit contains a light source 1, a photoelectronic receiver 2, an amplifier of a constant current 3, a driver of control signals 4, a light source intensity modulator 5, a sampling and storage unit 6, a voltage comparison circuit 7, a blocking circuit 8, and an emulsion duration selector 9.

The source 1 and the photoelectric receiver 2 are located but different sides from the path of the sheets of paper 10 and are optically interconnected. The photoelectric receiver 2 is connected to the input of a DC amplifier 3, which uses an inverting optical amplifier. The driver of the control signals 4 contains a voltage comparator 11, two circuits NOT 12 and 13, a single oscillator 14 and two RC-uiiH 15 and 16, connected in series with each other, with the input of the comparator 11 being the input of the phantomizer.

Q control signals 4, the output of the comparator 11 is connected to the input of the circuit 12, the output of which is connected to the input of the RC-value 15, the output of which is the first output of the control signaling generator 4 and simultaneously connected to the input

one-shot 14, the output of which is the second output of the control signal shaper 4 and connected to the input m of the HE circuit 13, the output of which is the third output of the unformer 4 of the 4 and connected to the input of the RC circuit 16, the output of which is the fourth output of the driver control signals 4.

The light source intensity modulator 5 is a transistor

5, the control input of which is connected to the third output of the control signal generator 4. The transistor switch has eaten only. It is connected to the light source 1 and the power source. The intensity modulator of the light source 5 is cooled to turn off the light source 1 for a finite time interval at the moment when the leading edge of the paper 10 enters the optical coupling zone between the light source 1 and the photoelectron box 2.

The sample and hold unit 6 contains a transistor switch 17, a storage capacitor, and a voltage generator 18, assembled on an operating amplifier. The control input of the transistor switch 17 is connected to the secondary output of the control signal generator 4. The input of the new array body 18 and the storage capacitor through the transistor switch 17 is connected to the output of the DC amplifier 3. The sampling and storage unit 6 serves

5 for storing the magnitude of the voltage at the output of the dc amplifier 3 when disconnected from the power source of the light source 1, i.e. for storing the level of illumination from external light sources. The voltage comparison circuit of the SRI 7 contains a two-input adder 19 and a voltage comparator 20. The inverting input of the complexor 20 is the first input of the voltage comparison circuit 7 and is connected to the output of an amplifier with a current amplifier of 3. A two-input input of the two-input adder 19 is the second input of the voltage comparison circuit 7 and is connected to the output of the sampling and storage unit b.

The output of the adder 19 is connected to the non-inverting input of the comparator 20. The output of the comparator 20 is the output of the voltage comparison circuit 7. The voltage comparison circuit 7 is designed to algebraically add the voltage value stored by the sampling and storage unit 6 to the second voltage the input of the adder 19 and the comparison of their sum with the magnitude of the voltage at the output of the DC amplifier 3.

The blocking circuit 8 contains an inverse RS-trigger and a 2I-NO circuit. The S and R inputs of the trigger are respectively the first and second inputs of blocking circuit 8. The S input is connected to the first output of control signal generator 4, and the R input is connected to the fourth output of control signal generator 4. Q output is connected to the first input 2INE schemes. The second input of the 2I-NOT circuit is the third input of the interlocking circuit 8 and is connected to the output of the voltage comparison circuit 7. The output of the 2I-NOT circuit is the output of the interlocking circuit 8. The interlock circuit 8 serves to protect the device from false alarms associated with tripping light source 1 from the power source. The pulse duration selector 9 contains two circuits, HE 21 and 23, and an integrating RC circuit 22, connected in series with each other. The input of the HE circuit 21 is the input of the pulse width selector 9 and is connected to the output of the blocking circuit 8. The output of the HE circuit 23 is the output of the entire device for controlling the doubleness of paper sheets. Pulse width selector 9 is a pulse selector of maximum duration and serves to reduce the likelihood of false indication of doubleness in the presence of significant local contamination on the sheets of paper being processed 10.

The operation of the device is as follows.

In the initial state, in the absence of a sheet of paper 10 in the optical communication zone between the light source 1 and the photoelectric receiver 2, the latter produces a signal proportional to the intensity of the light source 1. The signal produced by the photoelectric receiver 2 is amplified by a DC amplifier 3 and is fed to the inverting input voltage comparator 11. The non-inverting input of voltage comparator 11 is preliminarily set to a constant reference voltage, which is the voltage from the inverting input to voltage comparator 11 in the initial state. In this case, the voltage at the output of the voltage comparator 11 is equal to "O. The output voltage of the circuit is NOT 12 and if ,. the second and fourth outputs of the signal controller 4 ravi .. Tpai; the sampling key 17 of the sampling and storage unit 6 is open and the unit 6 is in the storage mode. The voltage at the third output of the imaging signal generator 4 is equal to "O and the transistor switch of the modulator of the intense T) of the 5 light is closed, i.e., the light source 1 is connected to the power source.

When the leading edge of a sheet of paper 10 enters the zone of optical communication between the light source 1 and the photoelectronic receiver 2, the luminous flux incident on the photoelectronic receiver decreases by more than 20%. Accordingly, the signal at the inverting input of the voltage comparator 11 is reduced. The comparator 11 is switched, and 1 "1 is set at its output. From arisen on you.code

The voltage comparator 11 across the voltage drop with the NE-12 circuit and the differentiating RC circuit 15 forms a short (less than 0.1 ms) synchronizing voltage pulse with a negative front voltage drop

The front 5, which from the first output of the driver control signals 4 enters the S-input of the RS flip-flop of the blocking circuit 8 and sets the trigger output Q to the “O” state. An additional sync pulse triggers the one-shot 14. The one-shot 14 produces a voltage pulse with a negative front-edge voltage of 3 ms, which is less than 10% of the time the paper 10 passes through the optical link between the light source 1 and the photoelectronic receiver 2 The voltage pulse generated by the one-shot 14, comes through the second output of the signal conditioning control 4

0 to the control input of the transistor switch 17 of the sample and hold unit 6 and closes it for 3 ms. At the same time, this pulse is inverted by the HE-I3 circuit and fed through the third output of the control signal generator 4 to the control input of the transistor switch of the light source intensity modulator o. The transistor switch of the intensity modulator of the light source 5 opens and opens the light source 1 from 3 ms for 3 ms

0 sources, eg power supply. For 3 ms, the sampling block n storage 6 produces a memory level at the output of a constant current amplifier 3. associated with the presence of a backlight from extraneous light sources of a printed paper sheet between the light source and the photoelectronic receiver 2.

After 3 IU one-shot 14 return to the initial state. In this case, the transistor switch 17 of the sampling and storage unit 6 is opened and the block 6 goes into storage mode, and the transistor switch mod.1 of the intensity torch of the light source 5 is closed, but the light source 1 is connected to the power source. From denial, tpc) non-repetition of the arising at the output of the HE13 circuit, at the moment when the one-shot 14 finishes, the differentiating RC-value 16 forms the second cncrrrrrrr impulse with a negative edge of the warping of the leading front, which is from the output of the signal generator control 4 enters the R-input of the RS-flip-flop of the blocking circuit 8 and the flush of the trigger to the state “1 pas Q-turn. Thus, during the operation of the one-vibration vibrator 14, the voltage at the Q-output of the grpger and, accordingly, at the 1st input of the exema 2I-HP, the blocking circuit B paBiio "O. In this case, the voltage on the output of the blocking circuit 8 is equal to "1, regardless of the voltage at the third stage of the travel lock circuit 8.

The memorized voltage from the output of the sampling block and snore 6 is fed to a two-input adder 19, where the total storage |, 1 is supplied with a reference voltage, but not the second input of the adder 19. Be first: o: iopH (prefix jro set. equal to the same paIe output of usiigelgusto ppogo current 3 when the optical zone between the light source 1 and the photoelectric zone 2 is barely used in the optical communication zone and there is no illumination from post-light sources.

The connections from the output of the adder 19 receive the non-inverting input of the voltage comparator 20. The inverting input of the comparator of the voltage 20 receives the s1d; a; 1 from the output of the input current; (1H) of the current 3. At There are only 10 sheets of paper in the I) and one of the OG1Ticheskogo connections between the light source 1 and the photoelectronic receiver 2 and the voltage inverting the input is larger than the noninversion input of the room) and 20, the same below the comparator 20 is equal to ABOUT. When the light source I comes from the power source and; or double sheets of paper K), in the optical communication zone between the light source 1 and the photoelectrochm receiver 2, the wiring of the inverting input becomes the mejbine voltage of the inverter of the voltage comparator 20 and the comparator 20 switches to the state with " 1 at the output. The voltage comparator 20 can be switched to "1 pa output

in the presence of

and a sheet of paper31 of the contaminant at 20 has 10 gi. In this case, the comparator

The output is “1” for a period of time proportional to the linear size of the contaminated area.

The signal from the output of the nanr 20 nominal comes through the third input of the blocking mode B to the first input of the 2I – NO circuit. Pa the output of the 2P-NOT circuit and, respectively, the pa of the output of the blocking mode 8 and the input of the pulse width selector 9, the voltage O is generated only when simultaneously at the output of the voltage comparator 20 and the Q output of the RS flip-flop of the blocking circuit 8 Signals with a level of "1" are present, i.e., when light source 1 is connected to a voltage source, and in the optical communication zone between light source 1 and photoelectronic receiver 2 there are double sheets of paper 10 or paper sheets with significant contamination,

In the pulse width selector 9 S1D1al, arriving at its input, is inverted by the HE 21 circuit and fed to the input of the integrator.1, RC circuit 22, When the double sheets of paper 10 are passing, the output pulse 21 of the PE 21 circuit is generated with an amplitude of The duration of the circuit exceeds the time required for charging the capacitor of the integrating RC circuit 22 to the threshold switching voltage of the HE 23 circuit to the state of "O at the output.

With the passage of contaminated sheets of paper 10, the pulse duration at the output of the HE 21 circuit is not sufficient to switch the HE 23 circuit to the state E at the exit. Thus, only when passing double sheets of paper 10 at the output of ce; i.KTOpa of pulse duration 9 a pulse of voltage e is formed by a negative voltage drop of the leading front, in other cases the voltage does not form at the output of the device.

During the passage of the first successive sheets of paper 10, the operation cycle of the device repeats, while the sampling and snoring unit 6 remembers the level of illumination from other light sources and accordingly adjusts the threshold value of the voltage parameter 20 for each sheet of paper 10. Since when the leading edge of a sheet of paper 10 is in the optical communication zone between the source 1 and the photoelectric receiver 2, the device is blocked for 3 ms from false alarms by the blocking circuit 8, then the folded edges of the paper sheets 10 Do not affect the operation of the device.

Thus, the use of the device improves the accuracy of control.

the doubleness of sheets of paper when the backlight level changes from external light sources and to avoid false positives of the device if the front edges of the sheets of paper are bent.

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Claims (4)

1. DEVICE FOR CONTROL OF TWO PAPER SHEETS, having a light source and a photoelectronic receiver, located on opposite sides of the path of the paper sheets and optically coupled, a DC amplifier, the input of which is connected to the photoelectric receiver, a voltage comparison circuit, the first input of which is connected with the output of a DC amplifier, and a pulse width selector, characterized in that, in order to improve the accuracy of control by eliminating the influence of changes in the level of extraneous illumination In this case, a control signal generator, a modulator are introduced into the device. The light source intensity, an sampling and storage unit for an analog signal characterizing extraneous illumination, and a blocking circuit, the input of the control signal generator being connected to the output of the DC amplifier and the input of the sampling and storage unit, the first output control signal generator is connected to the control input of the blocking circuit, the second output of the control signal generator is connected to the control input of the sampling and storage unit, t th output control signal generator coupled to the control input of the light intensity modulator, a fourth driver output control signal connected to the second input of the lockout circuit; the output of the sampling and storage unit is connected to the input of the voltage comparison circuit, the third input of the blocking circuit is connected to the output of the voltage comparison circuit, and the output of the blocking circuit is connected to the input of the pulse duration selector. 2. The device according to π. 1, characterized in that the control signal generator consists of a voltage comparator connected in series, two NOT circuits, a single vibrator and two RC circuits, the voltage comparator input being the input of the former, the output of the comparator connected to the input of the first NOT circuit, the output of which is connected to the input of the first RC circuit, the output of which is the first output of the driver and at the same time connected to the input of the one-shot, the output of which is the second output of the driver and connected to the input of the second circuit NOT One of which is the third output of the shaper and is connected to the input of the second RC circuit, the output of which is the fourth output of the shaper. 3. The device according to π. 1, characterized in that the blocking circuit contains an RS trigger and a 2I-NOT circuit, with the S and R inputs of the trigger being the first and second inputs of the blocking circuit, Q, the output of the trigger is connected to the first input of the 2I-NOT circuit, the second input of which is the third input of the circuit blocking, and the output of circuit 2I is NOT the output of the locking circuit. 4. The device according to π. 1, characterized in that the pulse width selector consists of two NOT circuits and an integrating RC circuit, wherein the input of the first circuit is NOT the input of the pulse duration selector and connected to the output of the blocking circuit, the output of the first circuit is NOT connected through the integrating RC circuit to the input of the second circuit NOT, the output of which is the output of the pulse width selector. >