WO2004080866A1 - 給紙装置 - Google Patents
給紙装置 Download PDFInfo
- Publication number
- WO2004080866A1 WO2004080866A1 PCT/JP2004/003132 JP2004003132W WO2004080866A1 WO 2004080866 A1 WO2004080866 A1 WO 2004080866A1 JP 2004003132 W JP2004003132 W JP 2004003132W WO 2004080866 A1 WO2004080866 A1 WO 2004080866A1
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- WIPO (PCT)
- Prior art keywords
- ultrasonic sensor
- output
- receiving
- value
- side ultrasonic
- Prior art date
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H7/00—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles
- B65H7/02—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors
- B65H7/06—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors responsive to presence of faulty articles or incorrect separation or feed
- B65H7/12—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors responsive to presence of faulty articles or incorrect separation or feed responsive to double feed or separation
- B65H7/125—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors responsive to presence of faulty articles or incorrect separation or feed responsive to double feed or separation sensing the double feed or separation without contacting the articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2553/00—Sensing or detecting means
- B65H2553/30—Sensing or detecting means using acoustic or ultrasonic elements
Definitions
- the present invention relates to a paper feeder, and more particularly, to a double feed detection using an ultrasonic wave, a threshold value that can reliably detect a double feed even when there is a sensor output fluctuation due to variations in sensitivity, sound pressure variation, etc. of an ultrasonic sensor.
- a threshold value that can reliably detect a double feed even when there is a sensor output fluctuation due to variations in sensitivity, sound pressure variation, etc. of an ultrasonic sensor.
- an ultrasonic detector that detects, using ultrasonic waves, that a plurality of (for example, two) sheets are conveyed or fed (double feed or DF) is known. Have been.
- the ultrasonic wave output from the transmitting ultrasonic sensor is received by the receiving ultrasonic sensor, and based on the level (wave height) of the received ultrasonic wave, whether one sheet is fed or not is determined. Detect if it is a sheet.
- Patent Document 1 Japanese Patent Laid-Open No. 6-26363. 288 Publication (see pages 2-3).
- the gain is adjusted according to the characteristics of the ultrasonic sensor by a variable resistor with one sheet of paper sandwiched at the time of shipment of the apparatus, or a threshold for judging double feed detection (hereinafter, judgment). (Also called slice value) is determined by prior evaluation. Since it is applied to the Z-apparatus, it is necessary to make adjustments for each apparatus. In addition, it is necessary to readjust when replacing the sensor due to the ultrasonic sensor failure.
- double feed may not be detected.
- the present invention relates to an ultrasonic sensor output variation caused by sensitivity, sound pressure variation, etc. It is an object of the present invention to provide a sheet feeding device in which a threshold value that can reliably detect a double feed even when there is a movement. Disclosure of the invention
- the paper feeder of the present invention is a paper feeder that detects conveyance of a plurality of papers using ultrasonic waves, and transmits the ultrasonic waves to a transmitting ultrasonic sensor and a transmitting ultrasonic sensor.
- the threshold value in detecting the conveyance of a plurality of sheets is set using the output of the receiving ultrasonic sensor when the output of the transmitting ultrasonic sensor is stopped as a reference value.
- the set threshold value (judgment slice value) is not fixed. Therefore, it is possible to follow changes in the detection environment (for example, changes in the paper feeder) and changes in the characteristics of the ultrasonic sensor itself (for example, aging). It can always be accurately detected. In other words, even if the sensor output fluctuates due to the sensitivity and sound pressure fluctuation of the ultrasonic sensor, the fluctuation of the device installation (accuracy), the environment, and the adhesion of paper powder, it is possible to reliably detect the double feed.
- the paper feeding device of the present invention is a paper feeding device that detects conveyance of a plurality of papers using ultrasonic waves, and includes a transmitting ultrasonic sensor that outputs ultrasonic waves, and a transmitting ultrasonic sensor.
- a driving circuit for supplying a driving signal for driving the ultrasonic sensor, a receiving-side ultrasonic sensor that is provided opposite to the transmitting-side ultrasonic sensor with a conveyance path in the paper feeding device interposed therebetween and receives ultrasonic waves;
- the paper feeder of the present invention may further comprise a paper feeder for detecting conveyance of a plurality of papers using ultrasonic waves.
- a transmitting-side ultrasonic sensor that outputs ultrasonic waves
- a driving circuit that supplies a driving signal to drive the transmitting-side ultrasonic sensor
- a transmitting-side ultrasonic sensor and a sheet feeding device A receiving-side ultrasonic sensor, which is provided opposite to the conveyance path and receives ultrasonic waves, an amplifier that amplifies the output of the receiving-side ultrasonic sensor, and a control signal that adjusts the output of the amplifier are formed.
- the driving circuit changes the wave number or the duty ratio of the microwave supplied to the transmission-side ultrasonic sensor in accordance with the control signal from the (second) adjusting means.
- the output value of the receiving ultrasonic sensor is adjusted by changing the reference voltage of the operational amplifier or changing the clock frequency or the duty ratio supplied by the drive circuit. Therefore, for example, when the paper feeder is shipped, it is not necessary to adjust the amplification factor of the amplifier in the ultrasonic receiving circuit by using a variable resistor. This is the same when, for example, replacing the ultrasonic sensor. Further, even when the ultrasonic receiving side circuit includes a band pass filter, it is possible to prevent the output of the ultrasonic sensor on the receiving side from being attenuated.
- FIG. 1 is a configuration diagram of a scanner, and is a diagram schematically illustrating a configuration of a scanner to which the sheet feeding device of the present invention is applied.
- FIG. 2 is a configuration diagram of a scanner, and is a diagram schematically illustrating a configuration of a scanner to which the sheet feeding device of the present invention is applied.
- FIG. 3 is a diagram showing an example of the configuration of the ultrasonic detector.
- FIG. 4 is a diagram showing an example of the configuration of the ultrasonic detector.
- FIGS. 5 (A) and 5 (B) are diagrams showing an operation example of the CPU.
- FIG. 6 is a diagram showing an example of an operation processing flow at the time of adjustment for determining Vs1 ice.
- FIG. 7 is a diagram showing a transition of paper and the output of the ultrasonic sensor (US sensor) on the receiving side.
- FIG. 5 is a diagram showing an example of an operation processing flow at the time of reading.
- FIG. 9 is a diagram showing a sensor reception waveform detected by the CPU.
- FIG. 10 is a diagram showing an example of a correction value ⁇ calculation processing flow.
- FIG. 11 ( ⁇ ), FIG. 11 ( ⁇ ) and FIG. 11 (C) show tables used for determining the correction value ⁇ .
- FIG. 12 ( ⁇ ) and FIG. 12 ( ⁇ ) show an example of a device configuration for adjusting the input value of the ultrasonic receiving sensor.
- FIG. 13 is a diagram showing a double feed output level adjustment sequence.
- FIG. 14 is a diagram showing a double feed output level adjustment sequence.
- FIG. 1 and 2 are configuration diagrams of a scanner, and schematically show the configuration of a scanner to which the sheet feeding device of the present invention is applied.
- Fig. 1 shows the appearance of the scanner
- Fig. 2 shows a schematic cross section of the scanner.
- the paper feeder consists of a paper table (shut) 31, pick roller 32, pick arm 33, separation pad 34, feed rollers 35, 36, and discharge roller 3. 7 and 38, and a transmitting ultrasonic sensor 17 and a receiving ultrasonic sensor 18 of the ultrasonic detector 1 described later.
- the two-dot chain line indicates the transport path of the sheet 100
- the arrow R indicates the reading position of the sheet 100.
- the paper 100 placed on the paper mounting table (shutter) 31 is picked up by the pick roller 32 in a state where an appropriate pressing force is applied by the pick arm 33. At this time, the paper 100 is separated one by one from the lower side by the pick roller 32 and the separation pad 34.
- the picked paper 100 is further conveyed to the feed rollers 35 and 36 by the pick roller 32, is conveyed to the reading position by the feed rollers 35 and 36, and is discharged by the discharge rollers 37 and 38. Is discharged.
- the transmission-side ultrasonic sensor 17 and the reception-side ultrasonic sensor 18 are provided upstream of the reading position in the transport path, as shown in FIG.
- the feed It is provided near either downstream or upstream of the rollers 35, 36. This makes it possible to detect the double-fed sheet 100 before it reaches the reading position and perform necessary processing (for example, stop conveyance).
- the scanner shown in FIGS. 1 and 2 is an example of an image processing apparatus to which the sheet feeding device of the present invention is applied.
- INDUSTRIAL APPLICABILITY The present invention is not limited to a scanner, and can be applied to a paper feeding device such as a copying machine and a facsimile.
- FIG. 3 and FIG. 4 are diagrams illustrating an example of the configuration of an ultrasonic detector included in the sheet feeding device of the present invention.
- an ultrasonic detector 1 detects the conveyance of a plurality of papers 100 using ultrasonic waves.
- the ultrasonic detector 1 of the paper feeding device includes a transmitting-side ultrasonic sensor 17, a driving circuit (a transmitting-side circuit, the same applies hereinafter) 41, a receiving-side ultrasonic sensor 18, and a plurality of sheets 100.
- a setting means (26) for setting a threshold value in detection of conveyance (double feed) and a detection means (26) for detecting conveyance of a plurality of sheets 100 are provided.
- the transmission-side ultrasonic sensor 17 outputs an ultrasonic wave.
- the drive circuit 41 supplies a drive signal for driving the ultrasonic sensor 17 on the transmission side.
- the drive circuit 41 is composed of a circuit that oscillates at a frequency near the resonance frequency of the transmission-side ultrasonic sensor 17 (ON / OF control is possible).
- the receiving-side ultrasonic sensor 18 is provided so as to face the transmitting-side ultrasonic sensor 17 across a sheet conveying path of the sheet feeding device, and receives ultrasonic waves.
- the setting means sets a threshold value for detecting the transport of the plurality of sheets 100 using the output of the receiving ultrasonic sensor 18 when the output of the transmitting ultrasonic sensor 17 is stopped by the drive circuit 41 as a reference value. Set.
- the detecting unit detects the conveyance of the plurality of sheets 100 by comparing the output of the receiving-side ultrasonic sensor 18 with a threshold.
- the ultrasonic detector 1 further includes an (a first stage) amplifier circuit 2 1 BPF (B and Pass Filter) 22, a (second stage) amplifier circuit 23, a sample and hold (S & H) circuit 24, an AD converter 25, CPU26, motor driver 27, motor 28, ROM29, RAM30.
- BPF B and Pass Filter
- S & H sample and hold circuit 24
- AD converter 25 CPU26
- motor driver 27 motor 28, ROM29, RAM30.
- the receiving ultrasonic sensor 18 outputs an electric signal corresponding to the ultrasonic wave received from the transmitting ultrasonic sensor 17, amplifies the electric signal with the amplifier circuit 21, and then removes noise with the BPF 22. After this, the signal after noise removal is further amplified by an amplifier circuit. Amplify in step 2.
- the AD converter 25 converts the value (analog signal) into a digital value (digital signal).
- This digital signal (input signal) is input to the CPU 26 (setting means and detecting means) and analyzed. That is, the input signal is analyzed by setting means and detecting means (see FIG. 5) realized by a setting and detection processing program (and hardware) on the CPU 26.
- the setting and detection processing program is stored in, for example, ROM 29 and Z or RAM 30.
- the CPU 26 ie, the detection means
- the ultrasonic detector 1 includes a transmission-side circuit (drive circuit) 41.
- the transmission side circuit 41 includes a driving IC 13, a resistance frequency adjusting oscillator (OSC) 15, and a variable resistor 16 shown in FIG.
- the drive IC 13 shown in FIG. 4 is a drive circuit that supplies a drive signal for driving the ultrasonic sensor 17 on the transmission side.
- the transmission-side ultrasonic sensor 17 outputs ultrasonic waves.
- the receiving ultrasonic sensor 18 receives this ultrasonic wave and outputs a detection signal in accordance with the intensity of the received ultrasonic wave. For example, if paper 100 does not exist between the transmitting ultrasonic sensor 17 and the receiving ultrasonic sensor 18, the receiving ultrasonic sensor 18 detects a signal at a certain level (normal level).
- a signal of a level (normal level) smaller than the normal level and larger than a predetermined threshold is detected, and if two sheets of paper 100 (or more) are present, A signal having a normal level and a level (abnormal level) smaller than the threshold value is detected.
- the drive IC 13 is controlled so that the receiving ultrasonic sensor 18 detects a signal of a normal level (actually, a signal equal to or larger than the normal level). Control is performed. That is, based on the ultrasonic waves received by the receiving ultrasonic sensor 18, the driving frequency of the driving signal matches the resonance frequency of the transmitting ultrasonic sensor 17, as described later (without using a variable resistor).
- the drive IC 13 is controlled as described above.
- Fig. 5 (A) shows an example of the setting means
- Fig. 6 shows the setting process flow when setting the threshold. Show one.
- the setting means uses the output of the receiving ultrasonic sensor 18 when the output of the transmitting ultrasonic sensor 17 is stopped by the drive circuit 41 as a reference value, and Set (generate) the threshold value (judgement slice value or V slice) for transport detection.
- the threshold is obtained by adding a fixed value to the output of the receiving ultrasonic sensor when the output of the transmitting ultrasonic sensor is stopped.
- the sensor control means 101 transmits a control signal to the transmission side circuit 41 and stops the oscillation of the transmission side circuit 41. Further, the sensor control means 101 applies a predetermined bias voltage to the amplifier circuit 23 (the operational amplifier 106 thereof, see FIG. 12 (A)).
- the ice1126 31 ice generating means 102 repeatedly receives the input signal from the AD converter 25 from the receiving ultrasonic sensor 18 several tens times, for example, 32 times, and receives the signal.
- the average value is calculated and set as a reference value V base (step S 11). That is, for example, a signal at 32 points in one raster is measured.
- the correction value is empirically determined for each installed device in consideration of the influence of noise and the like.
- the value of the calibration value ⁇ may be determined in advance, and the influence of the sensitivity and sound pressure variation of the ultrasonic sensor, the mounting variation, the environment, the adhesion of paper powder, etc., shall be taken into consideration for each device. May be determined each time as a variable value.
- FIG. 7 is a diagram showing the output transition of the paper and the receiving-side ultrasonic sensor (US sensor), and shows an example of the threshold value set by the above setting processing.
- the vertical axis indicates the output (digital value) of the receiving ultrasonic (US) sensor
- the horizontal axis indicates the paper sub-scanning direction (raster).
- the threshold value Vs1ice after capture is set to the level shown in Fig. 7 and used for double feed detection. For example, if the transported paper is
- 45K paper (hereinafter referred to as 45K paper)
- the input signal level (Vi n) is below the threshold value V s 1 ice, so it is determined that double feed has occurred (abnormal paper feed).
- the input signal level (V) is larger and heavier (or thicker) than in the case of 135 K paper and 195 K paper. in) is larger than the threshold value V s 1 ice, so it is determined that the paper is normally fed.
- 1 3 5 K paper and 2 1 9 5 K paper are not shown, but double feed because input signal level is lower than that of 45 K paper and lower than threshold V s 1 ice Is determined.
- the input signal level exceeds the threshold value Vs1 ice, it is determined that the paper is normally fed.
- the double feed can be detected correctly, though the ream is very small and thin. That is, although not shown, the input signal level becomes higher than that of the case of 135K paper and exceeds the threshold value Vs1 ice when one 22K paper is used. .
- the value of the input signal V in varies as shown in FIG. However, on the right side of FIG. 7, the input signal V in becomes smaller and is smaller than the threshold value V s1 i c e, so that it can be determined that the double feed is performed. This is because the input signal becomes extremely small in the vicinity where the sheet 100 is pressed by the feed rollers 35 to 38. According to the present invention, a double feed can be correctly detected over a wide range.
- FIG. 5 (B) shows an example of the detection means
- FIG. 8 shows a flow of the double feed detection process after setting the threshold value
- FIG. 9 shows the drive output from the transmitting circuit 41 in double feed detection. Indicates a pulse.
- the detecting unit detects the conveyance of the plurality of sheets 100 by comparing the output of the receiving-side ultrasonic sensor 18 with the threshold. That is, as shown in Fig. 5 (B), C
- the sensor control means 101 transmits a control signal to the transmission side circuit 41 and the like, and oscillates the transmission side circuit 41. Also, the sensor control means 101 is an amplifier circuit.
- a predetermined bias voltage is applied to 2 3 (the operational amplifier 106). In this state, C P
- the comparison means 104 of U26 receives and holds the input signal (digital value) from the AD connector 25 from the ultrasonic sensor 28 on the receiving side several tens of times, for example, 32 times. You (Step S21).
- the sensor control means 101 or the comparison means 104 sets a timer using an SH interrupt (step S22), and determines whether or not an interrupt has occurred (step S23).
- the SH interrupt is generated 32 times when, for example, 32 input signals are obtained as described above. That is, triggered by the SH interrupt, a continuous drive pulse on the transmitting side shown in FIG. 9 is output. For example, once every raster, 32 SH interrupts are generated with the elapse of a predetermined time. If no interrupt has occurred, repeat step S23. If an interrupt occurs, calculate the average of the 32 values received and held earlier, for example, the moving average, and use this as the input signal value Vin for double-feed (DF) detection (Step S24).
- DF double-feed
- the comparing means 104 compares the value V in of the input signal with the threshold value V slice of the register 103 (step S25). If V in ⁇ V s 1 ice is not satisfied, it is determined that the paper is normally fed. to decide. On the other hand, if V in ⁇ V s 1 ice, the comparing means 104 determines whether the number of times V in ⁇ V s 1 ice is a predetermined number, for example, 10 or more (step S26). If it is 10 times or more, it is determined that double feed has occurred, and an error signal is output. If it is not 10 times or more, step S22 and subsequent steps are repeated.
- FIGS. 10 and 11 are explanatory diagrams of the ultrasonic detector 1 in the sheet feeding device according to another example of the present invention, and show an example in which the correction value ⁇ is a variable value. That is, in the above example, as shown in step S12 of FIG. 6, a fixed value is used as the correction value ⁇ , but the correction value ⁇ may be a variable value.
- the threshold ⁇ in detecting the conveyance of a plurality of sheets is determined by the output Vbase of the receiving ultrasonic sensor when the output of the transmitting ultrasonic sensor 17 is stopped.
- the driving circuit 41 drives the transmitting ultrasonic sensor 17 step by step. (First) correlation between the output Vt of the receiving ultrasonic sensor 18 and the output Vt corresponding to the output Vt of the receiving ultrasonic sensor 18 in the case of moving (Fig. 11 (A )) And the receiving ultrasonic sensor determined based on the (second) correlation (shown in FIG. 11B) between the mounting position of the receiving ultrasonic sensor 18 and the output Vt. 18 It is obtained by adding the value ⁇ obtained according to the (third) correlation (shown in Fig. 11 (C)) between the output of 18 and the correction value ⁇ .
- a reference voltage Vbase is measured by applying a bias voltage in the same manner as in step S11 (step S31).
- the transmission-side ultrasonic sensor 17 is step-driven with no paper (step S32). That is, the drive circuit 41 applies a single drive pulse to the transmission-side ultrasonic sensor 17.
- the output Vt of the receiving-side ultrasonic sensor 28 is measured (step S33), and the output Vt corresponding to the output Vt is calculated using the third correlation shown in FIG. 11 (C).
- the correction value is specifically determined using the correlation diagram shown in FIG. That is, the sensor sensitivity and the sensor output Vt are in a proportional relationship as shown in FIG. 11 (A). Also, the sensor mounting position and the sensor output Vt have a correlation as shown in FIG. 11 (B). From the two correlations shown in Fig. 11 (A) and Fig. 11 (B), the third correlation between the sensor output Vt and the correction value a as shown in Fig. 11 (C) is obtained. Is led.
- FIGS. 12 (A), 13 and 14 show the configuration of the ultrasonic detector 1 in a paper feeding device according to another embodiment of the present invention, wherein the output of the amplification circuit 23 is varied in the amplification factor.
- An example is shown in which adjustment is made by other means instead of adjustment by resistance.
- a first adjusting means for forming a control signal for adjusting the output of the control amplifier 23, wherein the first adjusting means adjusts the reference voltage Vref of the operational amplifier 106.
- Adjust the output value from 23 Specifically, the offset of the operational amplifier 106 is adjusted (optimized for the receiving side circuit 14).
- This first means of adjustment is actually It comprises a sensor control means 101 and a voltage regulator 107.
- the amplifier circuit 23 is the second-stage amplifier in FIG.
- the amplifier circuit 23 includes a fixed resistor 105, an operational amplifier 106, and a voltage regulator 107 such as a DA converter.
- 108 is a fixed resistor. According to this example, it is possible to absorb variations in the resistance values and temperature characteristics of the fixed resistors 105 and 108, and eliminate the need for manual adjustment at the time of shipment or replacement of the sensor. Can respond to state changes due to
- FIG. 13 shows the double feed output level adjustment processing.
- the sensor control means 101 sets the conversion center value of the DA converter which is the voltage regulator 107 to an original value (for example, X80 of 256 gradations),
- the wave number of the burst wave applied to 7 is set to “0 wave” (step S41). That is, the output of the transmission-side ultrasonic sensor 17 is set to “0”.
- the sensor control means 101 monitors (acquires) the input value Vin from the receiving ultrasonic sensor 18 (step S42), the first slice upper limit value> input value? It is determined whether or not it is (step S43).
- This first slice upper limit is a value determined empirically.
- the sensor control means 101 sets the conversion center value of the DA converter, which is the voltage regulator 107, to a value obtained by adding + X01 (step S4). 4) Repeat steps S42 and below. If the first slice upper limit> the input value, the sensor control means 101 further determines whether the input value> the first slice lower limit (step S45). This first slice lower limit is a value determined empirically. If the input value is not greater than the first slice lower limit value, the sensor control means 101 sets the conversion center value of the DA converter, which is the voltage regulator 107, to a value obtained by subtracting X 1 from the value (step S46) ), And repeat steps S42 and subsequent steps. If input value> first slice lower limit, processing ends.
- the second adjusting means for forming a control signal for adjusting the output of the amplifier circuit 23 for amplifying the output of the receiving ultrasonic sensor 18 is provided.
- the drive circuit 41 sets the wave number (number of pulses) or duty ratio of the drive clock (burst wave) supplied to the transmission-side ultrasonic sensor 17 in accordance with the control signal from the second adjusting means. Change. Thereby, the input value from the amplifier circuit 23 is adjusted.
- the second adjusting means is composed of the sensor control means 101 and the transmitting circuit (driving Circuit) 4 1 According to this example, it is possible to absorb variations in the sensitivity of the receiving-side ultrasonic sensor 18 and prevent the sensor output from attenuating even when the receiving-side circuit 14 includes a band-pass filter.
- FIG. 14 shows the output level adjustment processing.
- the sensor control means 101 sets the pulse number (wave number) of the drive pulse (burst wave) applied to the transmission-side ultrasonic sensor 17 to "1 wave J (step S51).
- the duty ratio is 50% .
- the sensor control means 101 monitors the input value Vin from the receiving ultrasonic sensor 18 (step S52), the input value> It is determined whether or not the slice lower limit value is 2 (step S53) This second slice lower limit value is an empirically determined value and is different from the first slice lower limit. If it is not the slice lower limit value, the sensor control means 101 sets the burst wave number to +1 (step S54) and repeats the steps below S52.
- the sensor control means 101 further controls the receiving ultrasonic sensor 18 After monitoring the input value Vin from the first slice (step S55), it is determined whether or not the second slice upper limit> the input value (step S56). When the second slice upper limit value is not> the input value, the sensor control means 101 sets the duty ratio value (%) to a value obtained by subtracting 11% from the input value. Set (step S57) and repeat the steps from step S55 onwards If the second slice upper limit value> the input value, the process ends.
- FIG. 12 (B) shows an example of input value adjustment from the conventional receiving-side ultrasonic sensor 18.
- 42 is an amplifying circuit
- 108 is a fixed resistor
- 109 is a variable resistor
- 110 is an operational amplifier
- Vref is a reference voltage.
- the input value from the receiving ultrasonic sensor 18 is adjusted by changing the gain of the operational amplifier 110 by a variable resistor 109.
- this method requires manual adjustment at the time of shipment or sensor replacement, and cannot cope with state changes due to the usage environment.
- the set threshold value (judgment slice value) is not fixed in the paper feeding device, it is necessary to follow a change in the detection environment and a change in the characteristics of the ultrasonic sensor itself. Even after shipping, double feed in the paper feeder can always be accurately detected. In other words, even if the sensor output fluctuates due to the sensitivity of the ultrasonic sensor-sound pressure variation, device installation (accuracy) variation, environment, paper dust adhesion, etc., it is possible to reliably detect double feed.
- the input from the receiving side ultrasonic sensor is changed by changing the reference voltage of the operational amplifier or changing the clock frequency or the duty ratio supplied by the drive circuit. Adjust the value. Therefore, for example, when the paper feeder is shipped, it is not necessary to adjust the amplification factor of the amplifier in the ultrasonic receiving side circuit with a variable resistor. This is the same when, for example, replacing the ultrasonic sensor. Further, even when the ultrasonic receiving circuit includes a band-pass filter, the output of the ultrasonic sensor on the receiving side can be prevented from being attenuated.
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- Controlling Sheets Or Webs (AREA)
- Handling Of Sheets (AREA)
- Paper Feeding For Electrophotography (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04719090A EP1612168A4 (en) | 2003-03-12 | 2004-03-10 | PAPER HANDLING DEVICE |
US10/546,781 US20060145412A1 (en) | 2003-03-12 | 2004-03-10 | Paper feeder |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003-066277 | 2003-03-12 | ||
JP2003066277A JP2004269241A (ja) | 2003-03-12 | 2003-03-12 | 給紙装置 |
Publications (1)
Publication Number | Publication Date |
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WO2004080866A1 true WO2004080866A1 (ja) | 2004-09-23 |
Family
ID=32984529
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2004/003132 WO2004080866A1 (ja) | 2003-03-12 | 2004-03-10 | 給紙装置 |
Country Status (4)
Country | Link |
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US (1) | US20060145412A1 (ja) |
EP (1) | EP1612168A4 (ja) |
JP (1) | JP2004269241A (ja) |
WO (1) | WO2004080866A1 (ja) |
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Also Published As
Publication number | Publication date |
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JP2004269241A (ja) | 2004-09-30 |
EP1612168A1 (en) | 2006-01-04 |
US20060145412A1 (en) | 2006-07-06 |
EP1612168A4 (en) | 2008-04-02 |
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