CN210283611U - Detection system of printing machine - Google Patents
Detection system of printing machine Download PDFInfo
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- CN210283611U CN210283611U CN201920495952.3U CN201920495952U CN210283611U CN 210283611 U CN210283611 U CN 210283611U CN 201920495952 U CN201920495952 U CN 201920495952U CN 210283611 U CN210283611 U CN 210283611U
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- 238000001514 detection method Methods 0.000 title claims abstract description 15
- 239000003990 capacitor Substances 0.000 claims description 51
- 230000005669 field effect Effects 0.000 claims description 12
- 238000007689 inspection Methods 0.000 claims 1
- 238000001914 filtration Methods 0.000 abstract description 9
- 230000035945 sensitivity Effects 0.000 abstract description 7
- 238000007493 shaping process Methods 0.000 abstract description 5
- 230000001105 regulatory effect Effects 0.000 abstract description 3
- 230000003321 amplification Effects 0.000 description 10
- 238000003199 nucleic acid amplification method Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
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Abstract
The utility model provides a detecting system of printing machine, including amplifier circuit, filter circuit, amplifier rectifier circuit, comparison output circuit, amplifier circuit connects filter circuit, and filter circuit connects amplifier rectifier circuit, and amplifier rectifier circuit connects comparison output circuit, the effectual clutter signal interference of having solved, signal poor stability, the not high problem of sensitivity. The utility model discloses an echo that ultrasonic wave receiving transducer LS1 was reflected back to printing ink in real time detects the analog signal of telecommunication who changes, amplify the analog small signal through amplifier circuit, then get into filter circuit and accomplish the filtering that frequency is less than 37KHz and the frequency is higher than the 42KHz signal, improve signal quality, later signal gets into the amplified shaping circuit, amplifier circuit through gain automatically regulated, improve the signal controllability, by shaping circuit again, the sensitivity of signal has been improved, at last accomplish the detection to the printing ink volume with signal input control chip through comparison circuit and AND gate chip U8.
Description
Technical Field
The utility model relates to a printing machine field, especially a detecting system of printing machine.
Background
The printing machine is a machine for printing characters and images, ink is an important raw material for the printing machine, and the ink shortage or ink shortage is directly related to the printing effect and quality, so the detection of the printing machine on the ink quantity is important, at present, the detection of the ink quantity of the printing machine is usually performed by adopting an automatic detection module, which generally comprises an ultrasonic detection module, a control chip module and an execution module, wherein the ultrasonic module is used for detecting the quantity of the oil quantity, the control chip is used for analyzing signals, and the execution module is used for completing signals (an ink adding signal, an ink too low alarm signal and the like) transmitted by the control chip.
So the utility model provides a new scheme to solve the problem.
Disclosure of Invention
To above-mentioned condition, for overcoming prior art's defect, the utility model aims at providing a detecting system of printing machine, the effectual clutter signal interference of having solved, the poor, the not high problem of sensitivity of signal stability.
The detection system of the printing machine comprises an amplifying circuit, a filter circuit, an amplifying and rectifying circuit and a comparison output circuit, and is characterized in that the amplifying circuit is connected with the filter circuit, the filter circuit is connected with the amplifying and rectifying circuit, and the amplifying and rectifying circuit is connected with the comparison output circuit;
the amplifying and rectifying circuit comprises a resistor R12, one end of the resistor R12 is connected with the output end of an operational amplifier U3, the other end of the resistor R12 is respectively connected with the inverting input end of the operational amplifier U4, one end of the resistor R8 and the drain of an N-type field effect transistor Q1, the other end of the resistor R8 is respectively connected with the output end of the operational amplifier U4 and the cathode of a diode D1, the non-inverting input end of the operational amplifier U4 is grounded through a resistor R15, the anode of a diode D1 is respectively connected with one end of a resistor R3, one end of a resistor R6 and one end of a capacitor C2, the other end of a resistor R6 is respectively connected with one end of a capacitor C1 and one end of a resistor R4, the other end of a capacitor C2, the other end of a resistor R3 and the other end of a capacitor C1 are simultaneously grounded, the other end of the resistor R1 is connected with the non-, One end of a resistor R2, the other ends of resistors R1-R2 are grounded simultaneously, the output end of an operational amplifier U1 is connected with the gate of an N-type field effect transistor Q1, the source of the N-type field effect transistor Q1 is grounded, the output end of the operational amplifier U4 is connected with the cathode of a diode D1 and one end of a resistor R14 respectively, the other end of a resistor R14 is connected with one end of a resistor R17, the inverting input end of an operational amplifier U8 and one end of a resistor R23 respectively, the other end of a resistor R17 is connected with the cathode of a diode D2 and the non-inverting input end of an operational amplifier U7 respectively, the other ends of resistors R23 are connected with the anode of a diode D4 and one end of a resistor R22 respectively, the output end of the operational amplifier U22 is connected with the cathode of a diode D22 and the anode of a diode D22 respectively, the other end of a resistor R22 is connected with the inverting input end of an operational amplifier U22, The anode of the diode D3 and the anode of the diode D3 are connected to one end of the capacitor C6, one end of the resistor R18, one end of the capacitor C7, and the other end of the resistor R18 and the other end of the capacitor C6, respectively, and are commonly grounded.
Preferably, the amplifying circuit comprises an ultrasonic receiving sensor LS1, one end of an ultrasonic receiving sensor LS1 is connected with a resistor R9, the other end of the ultrasonic receiving sensor LS1 is grounded, the other end of the resistor R9 is connected with one end of a capacitor C4, the other end of the capacitor C4 is respectively connected with one end of a resistor R5 and an inverting input end of an operational amplifier U2, a non-inverting input end of the operational amplifier U2 is grounded through the resistor R11, and the other end of the resistor R5 is connected with an output end of the operational amplifier U2;
preferably, the filter circuit includes a resistor R10, one end of the resistor R10 is connected to the output terminal of the operational amplifier U2, the other end of the resistor R10 is connected to one end of a resistor R13, one end of a capacitor C3, and one end of a capacitor C5, the other end of the resistor R13 is grounded, the other end of the capacitor C3 is connected to the output terminal of the operational amplifier U3 and one end of the resistor R7, the other end of the capacitor C5 is connected to the other end of the resistor R7 and the inverting input terminal of the operational amplifier U3, and the homodromous input terminal of the operational amplifier U3 is grounded through the resistor R16;
preferably, the comparison output circuit includes a resistor R19, one end of the resistor R19 is connected to the capacitor C7, the other end of the resistor R19 is connected to the non-inverting input terminal of the operational amplifier U6, the inverting input terminal of the operational amplifier U6 is connected to one end of a resistor R20, the anode of the reference voltage diode U9, and the pin 2 of the potentiometer RW1, the other end of the resistor R20 is connected to +12V, the cathode of the reference voltage diode U9 and the pin 1 of the potentiometer RW1 are grounded at the same time, the adjustable terminal of the reference voltage diode U9 is connected to the adjustable terminal of the potentiometer RW1, the output terminal of the operational amplifier U6 is connected to the pin 2 of the and gate chip U5, the pin 1 of the and gate chip is connected to the control chip clock signal, and the pin 3 of the and.
The model of the ultrasonic receiving sensor LS1 is MA40S4R, the model of the reference voltage diode U9 is LM136, and the model of the and chip U5 is 74LS 09.
The utility model discloses an echo that ultrasonic wave receiving transducer LS1 was reflected back to printing ink in real time detects the analog signal of telecommunication who changes, enlarge the analog small signal through amplifier circuit, signal after the amplification gets into filter circuit and accomplishes the filtering that frequency is less than 37KHz and the frequency is higher than 42KHz signal, guarantee that the signal does not have the clutter interference, improve signal quality, later high-quality signal gets into and amplifies shaping circuit, amplifier circuit through gain automatically regulated, improve the signal controllability, again by shaping circuit, make signal output's waveform more accurate, the sensitivity of signal has been improved, at last accomplish the detection to the printing ink volume with signal input control chip through comparison circuit and AND gate chip U5.
Drawings
Fig. 1 is a block diagram of a detection system of a printing machine according to the present invention.
Fig. 2 is a circuit diagram of a detection system of a printing machine according to the present invention.
Detailed Description
The foregoing and other technical matters, features and effects of the present invention will be more clearly understood from the following detailed description of the embodiments with reference to fig. 1 to 2. The structural contents mentioned in the following embodiments are all referred to the attached drawings of the specification.
Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
Embodiment one, a detecting system of a printing machine, receive the echo after the ultrasonic wave hits the ink by the model MA40S4R ultrasonic receiving sensor LS1, convert the received ultrasonic echo signal into an analog electrical signal and output, one end of the ultrasonic receiving sensor LS1 is grounded, the model MA40S4R ultrasonic receiving sensor LS1 another end inputs the converted analog electrical signal into an amplifying circuit, carry on the primary amplification process of the small signal, the amplified signal is output through the output end of the operational amplifier U2, enter the filter circuit, carry on the filter process, the band-pass filter filters the interference signal with the frequency lower than 37KHz and higher than 42KHz, only pass through the amplified ultrasonic echo signal around 40KHz, improve the signal quality, the high quality signal is output through the output end of the operational amplifier U3, enter the amplifying rectifier circuit, pass through the amplifying circuit which can carry on gain automatic adjustment, the amplification effect of the signal is controlled within a certain range, the controllability and the stability of the signal are improved, then rectification processing is carried out to convert a negative signal of ultrasonic waves into a positive signal, the density of the signal in the positive range is improved, the capacitor C3 is charged through the diode D3, the waveform output after ultrasonic detection by the amplification rectification circuit is more accurate, the sensitivity of the signal is improved, the signal enters the comparison output circuit through the resistor R19, the signal is compared with the reference value voltage of the minimum ink amount to obtain an output signal, and the output signal phase of the comparison circuit and the clock signal of the control chip are input to the control chip for analyzing the ink amount, so that the addition of ink or the alarm of the over-low ink amount is controlled;
the amplifying and rectifying circuit receives an analog voltage signal output by the filter circuit, the analog voltage signal is input into an amplifying circuit consisting of a resistor R15, a resistor R8 and an operational amplifier U4 through a resistor R12, wherein the gain of the amplifying circuit is adjusted through circuits connected in parallel at two ends of a resistor R8, different amplifying effects are carried out on signals with different amplitudes, the stability of the output signal is ensured, a diode D1 rectifies the signal output by the operational amplifier U4, and then filtering processing is carried out through a capacitor C2, a resistor R6, a resistor R3 and a capacitor C1, a negative voltage value changing along with the output voltage amplitude of the operational amplifier U4 is generated, the voltage is followed through the operational amplifier U1 to control the resistance between the drain and the source of the N-type field effect transistor Q1, the effect of automatically controlling the gain of the amplifying circuit is achieved, when the amplitude of the signal output by the operational amplifier U4 is large, the gate input negative voltage of the N-type field effect transistor Q1, the drain and source resistances of the N-type field effect transistor Q1 are increased, the gain of the amplifying circuit formed by the operational amplifier U4 is decreased, otherwise the gain of the amplifying circuit formed by the operational amplifier U4 is increased, the signal which is amplified again is output from the output end of the operational amplifier U4 and enters the rectifying circuit formed by the operational amplifier U8, the resistor R17, the resistors R21-R23, the diode D2, the diode D4 and the operational amplifier U7 through the resistor R14, the input negative signal is changed into a positive signal, the positive signal is kept unchanged, the density of the positive signal is improved, when the positive signal is input from the inverting input end of the operational amplifier U8, the diode D2 is turned off, the diode D4 is turned on, the operational amplifier U8 is equivalent to form an inverting follower, the signal enters the inverting input end of the operational amplifier U7 through the resistor R22, the output end of the operational amplifier U7 outputs the positive signal, when a negative signal is input from the inverting input end of the operational amplifier U8, the diode D2 is turned on, the diode D4 is turned off, the negative signal is changed into a positive signal by the inverting follower formed by the operational amplifier U8, then the positive signal enters the non-inverting follower formed by the operational amplifier U7 to output the positive signal, the positive signal with the increased density charges the capacitor C6 through the diode D3, so that the waveform output after ultrasonic detection by the amplifying and rectifying circuit is more accurate, and the sensitivity of the signal is improved, the circuit comprises a resistor R12, one end of the resistor R12 is connected with the output end of the operational amplifier U3, the other end of the resistor R12 is respectively connected with the inverting input end of the operational amplifier U4, one end of the resistor R8 and the drain of the N-type field effect transistor Q1, the other end of the resistor R8 is respectively connected with the output end of the operational amplifier U4 and the cathode of the diode D1, the anode of the diode D1 is connected to one end of the resistor R3, one end of the resistor R6 and one end of the capacitor C2, the other end of the resistor R6 is connected to one end of the capacitor C1 and one end of the resistor R4, the other end of the capacitor C2, the other end of the resistor R3 and the other end of the capacitor C1 are grounded simultaneously, the other end of the resistor R4 is connected to the non-inverting input terminal of the operational amplifier U1, the inverting input terminal of the operational amplifier U1 is connected to one end of the resistor R1 and one end of the resistor R2, the other ends of the resistors R1-R2 are grounded simultaneously, the output terminal of the operational amplifier U1 is connected to the gate of the N-type field effect transistor Q1, the source of the N-type field effect transistor Q1 is grounded, the output terminal of the operational amplifier U1 is connected to the cathode of the diode D1 and one end of the resistor R1, the other end of the resistor R1 is connected, the other end of the resistor R17 is connected with the cathode of the diode D2 and the non-inverting input end of the operational amplifier U7, the other end of the resistor R23 is connected with the anode of the diode D4 and the one end of the resistor R22, the output end of the operational amplifier U8 is connected with the cathode of the diode D4 and the anode of the diode D2, the other end of the resistor R22 is connected with the inverting input end of the operational amplifier U7 and the one end of the resistor R12, the other end of the resistor R12 is connected with the output end of the operational amplifier U7 and the anode of the diode D3, the anode of the diode D3 is connected with the one end of the capacitor C6, the one end of the resistor R18 and the one end of the capacitor C7, and the other end of the resistor R18 and the.
In the second embodiment, on the basis of the first embodiment, the amplification circuit detects the echo reflected by the ink in real time through an ultrasonic receiving sensor LS1 with the model number MA40S4R and converts the echo into a changed analog electric signal, the changed analog electric signal enters a coupling circuit formed by a resistor R9 and a capacitor C4, enters an operational amplifier U2 and a resistor R11, the reverse proportion amplifying circuit formed by the resistor R5 is used for amplifying analog small signals and comprises an ultrasonic receiving sensor LS1 with the model of MA40S4R, one end of the ultrasonic receiving sensor LS1 with the model of MA40S4R is connected with a resistor R9, the other end of the ultrasonic receiving sensor LS1 with the model of MA40S4R is grounded, the other end of the resistor R9 is connected with one end of a capacitor C4, the other end of the capacitor C4 is respectively connected with one end of a resistor R5 and the inverting input end of an operational amplifier U2, the non-inverting input end of the operational amplifier U2 is grounded through a resistor R11, and the other end of the resistor R5 is connected with the output end of the operational amplifier U2;
the filter circuit receives a signal output by the amplifying circuit, the signal enters a band-pass filter circuit consisting of a resistor R13, a resistor R16, a resistor R7, a capacitor C3, a capacitor C5 and an operational amplifier U3 through a resistor R10, wherein the resistor R10 and the capacitor C3 form low-pass filtering for filtering noise waves with frequency higher than 42KHz, the capacitor C5 and the resistor R7 form high-pass filtering for filtering noise waves with frequency lower than 37KHz, the signal quality is improved only through ultrasonic echo signals with frequency about 40KHz, a high-quality signal is output from an output end of the operational amplifier U3 and comprises a resistor R10, one end of the resistor R10 is connected with an output end of the operational amplifier U2, the other end of the resistor R10 is respectively connected with one end of the resistor R13, one end of the capacitor C3 and one end of the capacitor C5, the other end of the resistor R13 is grounded, the other end of the capacitor C3 is respectively connected with an output end of the, the other end of the capacitor C5 is respectively connected with the other end of the resistor R7 and the inverting input end of the operational amplifier U3, and the homodromous input end of the operational amplifier U3 is grounded through the resistor R16;
the comparison output circuit receives the signal output by the amplifying and shaping circuit, the signal is input into a comparison circuit consisting of an operational amplifier U6, a resistor R20, a potentiometer RW1 and a reference diode U9 with the model of LM136 through a resistor R19, the signal is input from the non-inverting input end of the operational amplifier U6 and is compared with the reference voltage of the inverting input end of the operational amplifier U6 to generate an output signal, the value of the reference voltage is set to be the voltage value corresponding to the minimum ink amount through the adjustment of the adjustable end of the potentiometer RW1, when the ink amount is larger than the minimum ink amount, a high-low level signal with change is output from the output end of the operational amplifier U6 so as to calculate the ink amount later, when the ink amount is smaller than the minimum ink amount, the operational amplifier U6 outputs a low-level signal all the time, the signal output from the output end of the operational amplifier U6 enters an AND gate chip U5 with the model of 74LS09 and is, the phase-contrast is transmitted to the input end of a control chip through a pin 3 of an AND gate chip U5 with the model number of 74LS09, the clock signal of the control chip controls the collection of ultrasonic signals, when the collected signals are signals with high and low level changes, the control chip calculates the oil quantity, when the collected signals are low level signals all the time, the control chip performs low oil quantity reporting and simultaneously performs ink adding, the control chip comprises a resistor R19, one end of the resistor R19 is connected with a capacitor C7, the other end of the resistor R19 is connected with the non-inverting input end of an operational amplifier U6, the inverting input end of the operational amplifier U6 is respectively connected with one end of a resistor R20, the anode of a reference voltage diode U9 and a pin 2 of a potentiometer RW1, the other end of the resistor R20 is connected with a power supply +12V, the cathode of the reference voltage diode U9 and a pin 1 of the potentiometer RW1 are grounded simultaneously, the adjustable end of the reference voltage diode U9 is connected, the output end of the operational amplifier U6 is connected with a pin 2 of an AND gate chip U5, a pin 1 of the AND gate chip is connected with a clock signal of the control chip, and a pin 3 of the AND gate chip is connected with the input end of the control chip.
The utility model discloses when using, receive the echo after the ultrasonic wave meets printing ink by the model for MA40S4R ultrasonic wave receiving transducer LS1, convert received ultrasonic wave echo signal into analog electric signal and export, then get into amplifier circuit and carry out the elementary amplification processing of small signal, the signal after the amplification gets into filter circuit, carry out filtering processing, by band pass filter filtering frequency be less than 37KHz and be higher than 42KHz interference signal, only through the ultrasonic wave echo signal about 40KHz through the amplification, improve signal quality, high-quality signal gets into the amplification rectifier circuit, through the amplifier circuit that can carry out gain automatically regulated, control the amplification effect of signal within certain scope, improve the controllability and the stability of signal, later carry out rectification processing and change the negative value signal of ultrasonic wave into the density of positive value signal improvement signal in the positive value scope, the capacitor C3 is charged through the diode D3, so that the waveform output after ultrasonic detection by the amplifying and rectifying circuit is more accurate, the sensitivity of the signal is improved, the signal enters the resistor R19 and enters the comparison output circuit, the output signal is obtained by comparing the signal with the reference value voltage of the minimum ink amount, the phase of the output signal of the comparison circuit is compared with the phase of the output signal of the control chip, the output signal is input to the control chip for analyzing the ink amount, and the addition of ink or the alarm of the excessively low ink amount is controlled and completed.
The above description is provided for further details of the present invention with reference to the specific embodiments, which should not be construed as limiting the present invention; to the utility model discloses affiliated and relevant technical field's technical personnel are based on the utility model discloses under the technical scheme thinking prerequisite, the extension of doing and the replacement of operating method, data all should fall within the utility model discloses within the protection scope.
Claims (3)
1. The detection system of the printing machine comprises an amplifying circuit, a filter circuit, an amplifying and rectifying circuit and a comparison output circuit, and is characterized in that the amplifying circuit is connected with the filter circuit, the filter circuit is connected with the amplifying and rectifying circuit, and the amplifying and rectifying circuit is connected with the comparison output circuit;
the amplifying and rectifying circuit comprises a resistor R12, one end of the resistor R12 is connected with the output end of an operational amplifier U3, the other end of the resistor R12 is respectively connected with the inverting input end of the operational amplifier U4, one end of the resistor R8 and the drain of an N-type field effect transistor Q1, the other end of the resistor R8 is respectively connected with the output end of the operational amplifier U4 and the cathode of a diode D1, the non-inverting input end of the operational amplifier U4 is grounded through a resistor R15, the anode of a diode D1 is respectively connected with one end of a resistor R3, one end of a resistor R6 and one end of a capacitor C2, the other end of a resistor R6 is respectively connected with one end of a capacitor C1 and one end of a resistor R4, the other end of a capacitor C2, the other end of a resistor R3 and the other end of a capacitor C1 are simultaneously grounded, the other end of the resistor R1 is connected with the non-, One end of a resistor R2, the other ends of resistors R1-R2 are grounded simultaneously, the output end of an operational amplifier U1 is connected with the gate of an N-type field effect transistor Q1, the source of the N-type field effect transistor Q1 is grounded, the output end of the operational amplifier U4 is connected with the cathode of a diode D1 and one end of a resistor R14 respectively, the other end of a resistor R14 is connected with one end of a resistor R17, the inverting input end of an operational amplifier U8 and one end of a resistor R23 respectively, the other end of a resistor R17 is connected with the cathode of a diode D2 and the non-inverting input end of an operational amplifier U7 respectively, the other ends of resistors R23 are connected with the anode of a diode D4 and one end of a resistor R22 respectively, the output end of the operational amplifier U22 is connected with the cathode of a diode D22 and the anode of a diode D22 respectively, the other end of a resistor R22 is connected with the inverting input end of an operational amplifier U22, The anode of the diode D3 and the anode of the diode D3 are connected to one end of the capacitor C6, one end of the resistor R18, one end of the capacitor C7, and the other end of the resistor R18 and the other end of the capacitor C6, respectively, and are commonly grounded.
2. The detecting system of a printing machine as claimed in claim 1, wherein said amplifying circuit includes an ultrasonic receiving sensor LS1, one end of the ultrasonic receiving sensor LS1 is connected to a resistor R9, the other end of the ultrasonic receiving sensor LS1 is grounded, the other end of the resistor R9 is connected to one end of a capacitor C4, the other end of the capacitor C4 is connected to one end of a resistor R5 and the inverting input terminal of an operational amplifier U2, the non-inverting input terminal of the operational amplifier U2 is grounded through a resistor R11, and the other end of the resistor R5 is connected to the output terminal of the operational amplifier U2;
the filter circuit comprises a resistor R10, one end of a resistor R10 is connected with the output end of an operational amplifier U2, the other end of the resistor R10 is respectively connected with one end of a resistor R13, one end of a capacitor C3 and one end of a capacitor C5, the other end of the resistor R13 is grounded, the other end of the capacitor C3 is respectively connected with the output end of an operational amplifier U3 and one end of a resistor R7, the other end of the capacitor C5 is respectively connected with the other end of the resistor R7 and the inverting input end of an operational amplifier U3, and the homodromous input end of the operational amplifier U3 is grounded through a resistor R16;
the comparison output circuit comprises a resistor R19, one end of a resistor R19 is connected with a capacitor C7, the other end of the resistor R19 is connected with a non-inverting input end of an operational amplifier U6, an inverting input end of the operational amplifier U6 is respectively connected with one end of a resistor R20, the anode of a reference voltage diode U9 and a pin 2 of a potentiometer RW1, the other end of a resistor R20 is connected with a power supply +12V, the cathode of the reference voltage diode U9 and a pin 1 of the potentiometer RW1 are grounded simultaneously, an adjustable end of the reference voltage diode U9 is connected with an adjustable end of the potentiometer RW1, an output end of the operational amplifier U6 is connected with a pin 2 of an AND gate chip U5, a pin 1 of the AND gate chip is connected with a control chip clock signal, and a pin 3 of the.
3. The inspection system of a printing press as claimed in claim 2, wherein said ultrasonic receiving transducer LS1 is of type MA40S4R, said reference voltage diode U9 is of type LM136, and said and gate chip U5 is of type 74LS 09.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920495952.3U CN210283611U (en) | 2019-04-12 | 2019-04-12 | Detection system of printing machine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920495952.3U CN210283611U (en) | 2019-04-12 | 2019-04-12 | Detection system of printing machine |
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| CN210283611U true CN210283611U (en) | 2020-04-10 |
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| CN201920495952.3U Expired - Fee Related CN210283611U (en) | 2019-04-12 | 2019-04-12 | Detection system of printing machine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115107382A (en) * | 2022-07-25 | 2022-09-27 | 上海商米科技集团股份有限公司 | Photoelectric sensing device of printer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115107382A (en) * | 2022-07-25 | 2022-09-27 | 上海商米科技集团股份有限公司 | Photoelectric sensing device of printer |
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