CN216526234U - Detection circuit of printer nozzle - Google Patents
Detection circuit of printer nozzle Download PDFInfo
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- CN216526234U CN216526234U CN202122903338.6U CN202122903338U CN216526234U CN 216526234 U CN216526234 U CN 216526234U CN 202122903338 U CN202122903338 U CN 202122903338U CN 216526234 U CN216526234 U CN 216526234U
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Abstract
The utility model relates to a detection circuit of a printer nozzle, comprising: a power supply module; the method is characterized in that: further comprising: the thermistor array comprises a plurality of thermistors, and each thermistor is correspondingly arranged in each nozzle in the spray head respectively; the gating module is electrically connected with the thermistors respectively, and the power supply end of the power supply module is connected with the gating module; and the control module comprises a detection port for detecting the voltage between the power supply end of the power supply module and the gating module, and is connected with the control end of the gating module. The utility model has the advantages that: this circuit can realize detecting every nozzle to obtain the state of every nozzle, and shield trouble nozzle when printing, make can also continue to use when few part nozzles in the shower nozzle break down, promoted the utilization ratio and the life of shower nozzle, corresponding also promoted the printing effect.
Description
Technical Field
The utility model relates to the technical field of printing, in particular to a detection circuit of a printer nozzle.
Background
In the ink jet printing technology, the output of ink can be effectively realized after the ink is heated, and a good printing effect is achieved. The nozzle of the existing ink-jet printer consists of a plurality of nozzles, and if one or more nozzles of the nozzle are abnormal, the problems of pull lines, blank spaces and the like of a printed image can be caused. Therefore, each nozzle needs to be tested.
In order to solve the technical problem, for example, chinese patent application No. CN 201810168361.5 (application publication No. CN110202937A) discloses a method, an apparatus, a device, an inkjet printer, and a medium for detecting a nozzle of a head, wherein the method for detecting a nozzle of a head includes: acquiring detection time for detecting all nozzles, and when the nozzles of the detection nozzle are started, acquiring ink jet starting time and ink jet stopping time for simultaneously jetting ink by all the nozzles according to the detection time; sending a detection signal to pass through the preset jetting tracks of all the nozzles simultaneously according to the ink jetting starting time and the ink jetting stopping time of all the nozzles, wherein the preset jetting tracks are the motion tracks of ink drops jetted by the nozzles when the nozzles are normal; controlling all nozzles to jet ink simultaneously and obtaining feedback signals of detection signals passing through preset jetting tracks of all nozzles; and determining whether each nozzle of the spray head is abnormal or not according to the feedback signal. Although the detection method can realize abnormal detection of the nozzle, the phenomenon that ink cannot be discharged from the nozzle part of the nozzle and ink cannot be discharged at all due to the fact that the heating device of the nozzle is short-circuited or disconnected after the printer is started or works for a period of time is caused.
In addition, in the existing method, only the short circuit detection is carried out on the whole spray head, and if the short circuit detection is carried out according to the existing method, the whole spray head is judged to be short-circuited and cannot work integrally; in the actual use process, in order to save resources, if only a single or a small number of nozzles in the spray head are short-circuited, the spray head can be actually used continuously, but the short-circuit or open-circuit condition of the single nozzle cannot be detected in the existing method, so that further improvement is needed.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is to provide a detection circuit of a printer nozzle, which can detect the short circuit and open circuit states of a single nozzle in the nozzle, aiming at the prior art.
The technical scheme adopted by the utility model for solving the technical problems is as follows: a detection circuit for a printer head, comprising:
a power supply module;
the method is characterized in that: further comprising:
the thermistor array comprises a plurality of thermistors, and each thermistor is correspondingly arranged in each nozzle in the spray head;
the gating module is electrically connected with each thermistor respectively, and the power supply end of the power supply module is connected with the gating module;
and the control module comprises a detection port for detecting the voltage between the power supply end of the power supply module and the gating module, and the control module is connected with the control end of the gating module.
In order to realize the on or off of the detection circuit, the power supply device further comprises a first switch module connected with the control module, and the power supply end of the power supply module is connected with the gating module through the first switch module.
In order to protect the detection circuit, the detection circuit preferably further includes a voltage dividing module, and the voltage dividing module is disposed between a power supply end of the power supply module and the first switch module, or between the first switch module and the gating module.
Preferably, the first switch module includes a first MOS transistor and a third MOS transistor, a source of the first MOS transistor is connected to a power supply end of the power supply module, a drain of the first MOS transistor is connected to the gating module, a gate of the first MOS transistor is connected to a drain of the third MOS transistor, a gate of the third MOS transistor is connected to the control module, and a source of the third MOS transistor is grounded.
In order to prevent the breakdown of surrounding components caused by the over-fast switching rate of the MOS tube, the first switching module further comprises a third resistor and a fifth resistor, the third resistor is connected between the grid electrode of the third MOS tube and the control module, and the fifth resistor is connected between the grid electrode of the first MOS tube and the drain electrode of the third MOS tube.
Preferably, the voltage dividing module includes a first resistor disposed between the power supply end of the power supply module and the first switch module, and the source of the first MOS transistor is connected to the power supply end of the power supply module through the first resistor.
In order to prevent the detection signal of the detection port from being damaged due to the fact that the voltage and the current are too large, the detection circuit preferably further comprises a protection circuit, the protection circuit comprises a second resistor and a voltage-regulator tube, the negative electrode of the voltage-regulator tube is connected with one end of the second resistor, the other end of the second resistor is connected between the drain electrode of the first MOS tube and the gating module, the voltage-regulator tube and the second resistor are correspondingly connected with the detection port of the control module, and the positive electrode of the voltage-regulator tube is connected with the grounding end.
Compared with the prior art, the utility model has the advantages that: carry out the electricity through gating module and the thermistor in locating each nozzle in the shower nozzle and be connected, thereby can gate the gating module through control module, and detect single nozzle in proper order, control module obtains the resistance of thermistor in each nozzle through the detected signal analysis of detection port in addition, consequently this detection circuitry can realize detecting every nozzle, in order to obtain the state of every nozzle, and shield trouble nozzle when printing, make and still can continue to use when few nozzles in the shower nozzle break down, the utilization ratio and the life of shower nozzle have been promoted, corresponding printing effect has also been promoted.
Drawings
FIG. 1 is a block diagram of a detection circuit according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a detection circuit in an embodiment of the utility model.
FIG. 3 is a flowchart of a printing method of a printer according to an embodiment of the present invention.
Detailed Description
The utility model is described in further detail below with reference to the accompanying examples.
As shown in fig. 1 to 2, the detection circuit of the printer head in this embodiment includes a power supply module 1, a voltage dividing module 6, a first switch module 5, a thermistor array 2, a gating module 3, and a control module 4. The power supply end VCC of the power supply module 1 is electrically connected with the gating module 3 through the voltage division module 6 and the first switch module 5 which are connected in series, and the control module 4 is respectively connected with the first switch module 5 and the gating module 3, so that the first switch module 5 is controlled to be switched on and off and a gating signal is issued to the gating module 3. In this embodiment, the control module 4 is a single chip microcomputer.
The printer nozzle is composed of a plurality of nozzles, in order to realize detection of each nozzle, the thermistor array 2 and the gating module 3 are arranged in the printer nozzle, the thermistor array 2 comprises a plurality of thermistors, each thermistor is electrically connected with the gating module 3, and in addition, the first switch module 5 is electrically connected with the gating module 3 in the printer nozzle. The number of the thermistors is determined according to the number of nozzles in the printer head, each thermistor is respectively arranged in each nozzle in the head in a one-to-one correspondence manner, the resistance value of each thermistor can be changed along with the change of the temperature of the nozzle, and the resistance-temperature relationship of each thermistor is determined according to the material characteristics of the thermistor, so that the abnormal condition of each nozzle can be judged according to the resistance value of the thermistor. The relationship between the thermistor and the nozzle is not limited to the one-to-one relationship in the present embodiment, and one or more thermistors may be provided in each nozzle.
In addition, the control module 4 further includes a detection port T3 for detecting a voltage between the power supply terminal of the power supply module and the gating module, and the control module 4 can calculate a resistance value of the turned-on thermistor according to the detected voltage.
In this embodiment, the first switch module 5 includes a first MOS transistor Q1, a third resistor R3, a fifth resistor R5, and a third MOS transistor Q3, a source of the first MOS transistor Q1 is connected to a power supply terminal VCC of the power supply module 1, a drain of the first MOS transistor Q1 is connected to the gating module 3, a gate of the first MOS transistor Q1 is connected to a drain of the third MOS transistor Q3 through the fifth resistor R5, a gate of the third MOS transistor Q3 is connected to the control module 4 through the third resistor R3, and a source of the third MOS transistor Q3 is grounded. The first MOS transistor Q1 is a PMOS transistor, and the third MOS transistor Q3 is an NMOS transistor, but may also be implemented in a triode manner. As shown in FIG. 2, the third resistor R3 is connected to the first port T1 of the control module 4.
The voltage dividing module 6 is disposed between the power supply terminal VCC of the power supply module 1 and the first switch module 5, or between the first switch module 5 and the gating module 3. In this embodiment, the voltage dividing module 6 includes a first resistor R1, and the source of the first MOS transistor Q1 is connected to the power supply terminal VCC of the power supply module 1 through the first resistor R1. The number and the resistance value of the divider resistors are specifically set according to actual needs. In this embodiment, the power supply terminal VCC of the power supply module 1 inputs 15V voltage.
The detection circuit further comprises a protection circuit 7, the protection circuit 7 comprises a second resistor R2 and a voltage regulator tube D1, the negative electrode of the voltage regulator tube D1 is connected with one end of the second resistor R2, the other end of the second resistor R2 is connected between the drain electrode of the first MOS tube Q1 and the gating module 3, the voltage regulator tube D1 and the second resistor R2 are correspondingly connected with a detection port T3 of the control module 4, and the positive electrode of the voltage regulator tube D1 is connected with a ground terminal GND. Therefore, the detection signal can be effectively prevented from being damaged when the current or the voltage in the detection loop is overlarge, and the detection process is protected.
The detection principle of the detection circuit is as follows:
the first switch module 5 is controlled to be conducted by the control module 4, that is: the control module 4 sends a conducting signal through the first port T1, the level of the first port T1 is changed from low level to high level, the third MOS transistor Q3 is conducted, the gate of the first MOS transistor Q1 is pulled down after the third MOS transistor Q3 is conducted, so that the first MOS transistor Q1 is conducted, and the power supply input of the power supply module 1 reaches the nozzle part through the first MOS transistor Q1 after being subjected to voltage division by the first resistor R1. In addition, the control module 4 sends a gating signal to the gating module 3 to gate each nozzle in the printer head in sequence, meanwhile, the first resistor R1 and the thermistor in any nozzle form a voltage division circuit, the divided voltage is obtained through the detection port T3 and fed back to the control module 4, the resistance value of the thermistor corresponding to the nozzle can be obtained through setting a lookup table between the voltage and the resistor in the control module 4, and the short circuit, the open circuit and the deviation of the thermistor can be judged according to the comparison between the actual resistance value and the theoretical resistance value.
The detection circuit can be applied to a printer, wherein the printer nozzle can be detected when the printer is started, a new nozzle is replaced or a fault is reported.
The printer in this embodiment includes the above-mentioned power module 1, voltage division module 6, constitute first power supply circuit between first switch module 5 and the gating module 3, in order to make the detection circuit of above-mentioned print head only carry out when needs detect, do not influence the normal work of print head, still be provided with second power supply circuit between the power supply end VCC of power module 1 of this printer and the print head, as shown in fig. 2, this second power supply circuit still includes the second switch module 8 that is connected with control module 4, the power supply end VCC of power module 1 passes through second switch module 8 and connects gating module 3. In this embodiment, the second switch module 8 includes a second MOS transistor Q2, a fourth resistor R4, a sixth resistor R6, and a fourth MOS transistor Q4, a source of the second MOS transistor Q2 is connected to the power supply terminal VCC of the power supply module 1, a drain of the second MOS transistor Q2 is connected to the gating module 3, a gate of the second MOS transistor Q2 is connected to a drain of the fourth MOS transistor Q4 through the sixth resistor R6, a gate of the fourth MOS transistor Q4 is connected to the control module 4 through the fourth resistor R4, and a source of the fourth MOS transistor Q4 is grounded. The second MOS transistor Q2 is a PMOS transistor, and the fourth MOS transistor Q4 is an NMOS transistor, but may also be implemented in a triode manner. As shown in FIG. 2, the fourth resistor R4 is connected to the second port T2 of the control module 4.
As shown in fig. 3, the printing method of the printer includes the following steps:
step 1, before the printer executes printing work, the control module 4 controls the detection circuit to detect the thermistor in each nozzle in the printer nozzle, and feeds back the detection result to the control module 4, and further judges one of the following states of each nozzle in the printer nozzle according to the difference of the detection signal: short circuit state, open circuit state, deviation state and normal state; wherein the short circuit state and the open circuit state are fault states;
step 2, after all nozzles in the printer nozzle are detected, closing the first switch module 5 through the control module 4;
step 4, resetting heating parameters of the nozzles in the deviation state;
and 5, generating a new printing decoding, turning on the second switch module 8 through the control module 4, and then supplying power to the printer nozzle through the second power supply circuit by the power supply module 1, receiving a printing task and executing the printing task.
The deviation state means that the resistance value of the thermistor is within the set range of the theoretical resistance value, but has a certain deviation from the theoretical set value, and the corresponding heating parameter in step 4 is the heating time, so that the heating time can be increased or decreased to adjust different heating values, thereby realizing stable image processing.
In addition, the printing principle in the step 5 is as follows: the control module 4 sends a conducting signal through the second port T2, the level of the second port T2 is changed from low level to high level, the fourth MOS transistor Q4 is conducted, the gate of the second MOS transistor Q2 is pulled down after the fourth MOS transistor Q4 is conducted, so that the second MOS transistor Q2 is conducted, and the power supply input of the power supply module 1 reaches the nozzle part after passing through the second MOS transistor Q2. In addition, the control module 4 sends a gating signal to the gating module 3 to gate all nozzles in the printer nozzle in sequence, and sends the gating signal to the gating module 3 with the control system, and 432 nozzles of the nozzle normally jet ink after being gated according to the portrait.
Therefore, the detection circuit in the utility model can detect the state of each nozzle in the sprayer, and in addition, the skipping action of each nozzle is realized through the state of each nozzle when the printer prints, and the image forming path is recalculated, so that the problems of image deletion and short-time short circuit of a circuit system can be eliminated, the utilization rate of the sprayer can be obviously improved, and the service life of the sprayer is prolonged.
Claims (7)
1. A detection circuit for a printer head, comprising:
a power supply module (1);
the method is characterized in that: further comprising:
the thermistor array (2) comprises a plurality of thermistors, and each thermistor is correspondingly arranged in each nozzle in the spray head;
the gating module (3) is respectively and electrically connected with each thermistor, and a power supply end (VCC) of the power supply module (1) is connected with the gating module (3); and
the control module (4) comprises a detection port (T3) for detecting voltage between a power supply terminal (VCC) of the power supply module (1) and a gating module (3), and the control module (4) is connected with a control terminal of the gating module (3).
2. The detection circuit of a printer head as claimed in claim 1, wherein: the power supply system is characterized by further comprising a first switch module (5) connected with the control module (4), wherein a power supply end (VCC) of the power supply module (1) is connected with the gating module (3) through the first switch module (5).
3. The detection circuit of a printer head as claimed in claim 2, wherein: still include partial pressure module (6), partial pressure module (6) are located between power supply module (1) power supply end (VCC) and first switch module (5), or between first switch module (5) and gating module (3).
4. The detection circuit of a printer head as claimed in claim 3, wherein: the first switch module (5) comprises a first MOS tube (Q1) and a third MOS tube (Q3), the source electrode of the first MOS tube (Q1) is connected with the power supply end (VCC) of the power supply module (1), the drain electrode of the first MOS tube (Q1) is connected with the gating module (3), the gate electrode of the first MOS tube (Q1) is connected with the drain electrode of the third MOS tube (Q3), the gate electrode of the third MOS tube (Q3) is connected with the control module (4), and the source electrode of the third MOS tube (Q3) is grounded.
5. The detection circuit of a printer head as claimed in claim 4, wherein: the first switch module (5) further comprises a third resistor (R3) and a fifth resistor (R5), the third resistor (R3) is connected between the gate of the third MOS transistor (Q3) and the control module (4), and the fifth resistor (R5) is connected between the gate of the first MOS transistor (Q1) and the drain of the third MOS transistor (Q3).
6. The detection circuit of a printer head as claimed in claim 4 or 5, wherein: the voltage division module (6) is including locating first resistance (R1) between power supply terminal (VCC) of power module (1) and first switch module (5), the power supply terminal (VCC) of power module (1) is connected through first resistance (R1) to the source electrode of first MOS pipe (Q1).
7. The detection circuit of a printer head as claimed in claim 4 or 5, wherein: the protection circuit (7) comprises a second resistor (R2) and a voltage regulator tube (D1), the negative electrode of the voltage regulator tube (D1) is connected with one end of the second resistor (R2), the other end of the second resistor (R2) is connected between the drain electrode of the first MOS tube (Q1) and the gating module (3) and between the voltage regulator tube (D1) and the second resistor (R2), the detection port (T3) of the control module (4) is correspondingly connected, and the positive electrode of the voltage regulator tube (D1) is connected with a ground terminal (GND).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122903338.6U CN216526234U (en) | 2021-11-23 | 2021-11-23 | Detection circuit of printer nozzle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122903338.6U CN216526234U (en) | 2021-11-23 | 2021-11-23 | Detection circuit of printer nozzle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216526234U true CN216526234U (en) | 2022-05-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122903338.6U Active CN216526234U (en) | 2021-11-23 | 2021-11-23 | Detection circuit of printer nozzle |
Country Status (1)
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|---|---|
| CN (1) | CN216526234U (en) |
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2021
- 2021-11-23 CN CN202122903338.6U patent/CN216526234U/en active Active
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