Detection circuit and detection method of printing nozzle

Abstract

The invention provides a detection circuit and a detection method of a printing nozzle, the detection circuit is arranged on a clamping plate, the clamping plate comprises a plurality of connectors, the printing nozzle comprises a plurality of cables, the cables are in one-to-one butt joint with the connectors, the connectors comprise a plurality of connecting terminals, the plurality of connecting terminals comprise grounding terminals, and the grounding terminals are connected with the clamping plate. The FPGA outputs a test signal and sends the test signal to the tested contact point through the isolation circuit and the grounding terminal, the tested contact point sends a feedback signal to the FPGA according to the test signal, the FPGA judges whether the tested contact point is consistent with the test signal sent by the FPGA according to the feedback signal, if the tested contact point is consistent with the test signal sent by the FPGA, the connection is normal, and if the tested contact point is kept constant, the connection is normal. If the test signal does not change along with the test signal sent by the FPGA, the connection is abnormal. According to the detection circuit and the detection method of the printing nozzle, whether the position of the grounding point of the cable is correct or not can be automatically detected, so that whether the cable is connected to a correct connector or not is judged. The innovative design significantly improves the reliability and stability of the printing system.

Description

Technical Field

[0001] The present invention relates to the field of printing technology, and in particular to a detection circuit and a detection method for a printing nozzle. Background Art

[0002] The description in this section merely provides background information related to the present disclosure and does not constitute prior art.

[0003] Printer heads are usually equipped with multiple cables, which need to be connected to multiple connectors on the card board one by one. However, in existing technical solutions, due to the similar shapes and sizes of the cables, it is easy for the cables to be mistakenly connected to the wrong connector. This incorrect connection not only causes the device to malfunction, but may also cause circuit damage, thus affecting the reliability and stability of the entire system.

[0004] It should be noted that the above introduction to the technical background is only for the convenience of providing a clear and complete description of the technical solutions of the present invention and for the convenience of understanding by those skilled in the art. It cannot be considered that the above technical solutions are well known to those skilled in the art simply because these solutions are described in the background technology section of the present invention. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a detection circuit and a detection method for a printing nozzle.

[0006] In order to solve the above technical problems, a detection circuit for a print head is provided, the detection circuit is arranged on a card board, the card board includes multiple connectors, the print head includes multiple cables, the cables are connected to the connectors one by one, the connector includes multiple connection terminals, the multiple connection terminals include a ground terminal, the detection circuit includes an FPGA, an isolation circuit, the first output end of the FPGA is connected to the input end of the isolation circuit, the output end of the isolation circuit is connected to the ground terminal of the connector, the ground terminal is connected to one of the contact points of the cable of the print head, the contact point is a tested contact point, the ground terminal is connected to the first input end of the FPGA, the FPGA outputs a test signal and sends it to the tested contact point through the isolation circuit and the ground terminal, the tested contact point sends a feedback signal to the FPGA according to the test signal, the FPGA determines whether the tested contact point is consistent with the test signal sent by the FPGA according to the feedback signal, if they are consistent, the connection is normal, if the tested contact point maintains a constant value and does not change with the test signal sent by the FPGA, the connection is abnormal.

[0007] Preferably, the detection circuit also includes a switching circuit, the input port of the switching circuit is connected to a high-voltage power supply, the output port of the switching circuit is connected to the high-voltage terminal of the connector, the second output end of the FPGA is connected to the control port of the switching circuit, and before the detection circuit detects, the FPGA controls the switching circuit to be in a disconnected state. When the detection circuit detects that the connector and the cable are connected normally, the FPGA controls the switching circuit to be in a connected state.

[0008] Preferably, the test signals output by the FPGA are low-level signals and high-level signals. When the FPGA outputs a high-level signal and the feedback signal is a low-level signal, the FPGA outputs a low-level signal again. When the feedback signal is a low-level signal, it is judged that the tested contact point is a grounding point and the cable and connector of the print head are abnormally connected; when the FPGA outputs a high-level signal and the feedback signal is a high-level signal, it is judged that the tested contact point is not a grounding point and the cable and connector of the print head are normally connected.

[0009] Preferably, the print head has 4 cables, each cable has 16 contact points, the 16 contact points include one or more grounding points, and the grounding points of each cable are located at different positions.

[0010] The present application also provides a method for detecting a print head, comprising the following steps: an FPGA outputs a test signal that is sent to a contact point under test through an isolation circuit and a ground terminal; the contact point under test sends a feedback signal to the FPGA based on the test signal; the FPGA determines based on the feedback signal whether the contact point under test is consistent with the test signal sent by the FPGA; if they are consistent, the connection is normal; if the contact point under test maintains a constant value and does not change with the test signal sent by the FPGA, the connection is abnormal.

[0011] Preferably, before the detection circuit detects, the FPGA controls the switch circuit to be in a disconnected state, and when the detection circuit detects that the connector and the cable are connected normally, the FPGA controls the switch circuit to be in a connected state.

[0012] Preferably, the detection method is specifically as follows: when the FPGA outputs a high-level signal and the feedback signal is a low-level signal, then the FPGA outputs a low-level signal again, and when the feedback signal is a low-level signal, it is judged that the tested contact point is a grounding point, and the cable and connector of the print head are abnormally connected; when the FPGA outputs a high-level signal and the feedback signal is a high-level signal, it is judged that the tested contact point is not a grounding point, and the cable and connector of the print head are normally connected.

[0013] By means of the above technical solution, the beneficial effects of the present invention are as follows:

[0014] The detection circuit and detection method of the print head of the present invention can automatically detect whether the grounding point position of the cable is correct, thereby determining whether the cable is connected to the correct connector. This innovative design effectively prevents circuit damage caused by incorrect cable connection and improves the reliability and stability of the printing system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the printing nozzle of the present application.

[0016] Figure 2 It is a structural schematic diagram of the card board of this application. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] It should be noted that, in the description of the present invention, the terms "first", "second", etc. are only used for descriptive purposes and to distinguish similar objects. There is no order of precedence between the two, and they cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0019] like Figure 1 As shown, a print head of the present application has 4 cables, each cable has 16 contact points, the 16 contact points include one or more grounding points, and the grounding points of each cable are located at different positions. Therefore, as long as the grounding point is tested to be connected to the correct position, it can be determined whether the cable is connected correctly. The number of cables used by the print head in the present application is not limited to a specific number. Similarly, the number of contact points on the cable can also be changed.

[0020] The present invention provides a detection circuit for a print head, which is arranged on a card board. The card board includes multiple connectors. The print head includes multiple cables. The cables are connected to the connectors one by one. The connector includes multiple connection terminals. The multiple connection terminals include a ground terminal. The detection circuit includes an FPGA and an isolation circuit. The first output end of the FPGA is connected to the input end of the isolation circuit. The output end of the isolation circuit is connected to the ground terminal of the connector. The ground terminal is connected to one of the contact points of the cable of the print head, and the contact point is a tested contact point. The ground terminal is connected to the first input end of the FPGA. The FPGA outputs a test signal and sends it to the tested contact point through the isolation circuit and the ground terminal. The tested contact point sends a feedback signal to the FPGA according to the test signal. The FPGA determines whether the tested contact point is consistent with the test signal sent by the FPGA according to the feedback signal. If they are consistent, the connection is normal. If the tested contact point maintains a constant value and does not change with the test signal sent by the FPGA, the connection is abnormal.

[0021] The detection circuit also includes a switch circuit, the input port of the switch circuit is connected to a high-voltage power supply, the output port of the switch circuit is connected to the high-voltage terminal of the connector, and the second output end of the FPGA is connected to the control port of the switch circuit. Before the detection circuit detects, the FPGA controls the switch circuit to be in a disconnected state. When the detection circuit detects that the connector is correctly connected to the cable, the FPGA controls the switch circuit to be in a connected state. The test signal output by the FPGA is a low-level signal and a high-level signal. When the FPGA outputs a high-level signal and the feedback signal is a low-level signal, the FPGA outputs a low-level signal again. When the feedback signal is a low-level signal, it is judged that the tested contact point is a grounding point and the cable of the print head is abnormally connected to the connector; when the FPGA outputs a high-level signal and the feedback signal is a high-level signal, it is judged that the tested contact point is not a grounding point and the cable of the print head is normally connected to the connector.

[0022] The detection circuit and detection method of the print head of the present invention can automatically detect whether the grounding point position of the cable is correct, thereby determining whether the cable is connected to the correct connector. This innovative design effectively prevents circuit damage caused by incorrect cable connection and improves the reliability and stability of the printing system.

[0023] The above-described embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or changes made by those skilled in the art based on the present invention are within the protection scope of the present invention. The protection scope of the present invention shall be subject to the claims.

Claims

1. A detection circuit for a print head, characterized in that: The detection circuit is arranged on a card board, the card board includes a plurality of connectors, the print head includes a plurality of cables, the cables are connected to the connectors one by one, the connector includes a plurality of connection terminals, the plurality of connection terminals include a ground terminal, the detection circuit includes an FPGA, an isolation circuit, The first output terminal of the FPGA is connected to the input terminal of the isolation circuit, the output terminal of the isolation circuit is connected to the ground terminal of the connector, the ground terminal is connected to one of the contact points of the cable of the print head, the contact point is the tested contact point, and the ground terminal is connected to the first input terminal of the FPGA. The FPGA outputs a test signal that is sent to the contact point under test through the isolation circuit and the ground terminal. The contact point under test sends a feedback signal to the FPGA based on the test signal. The FPGA determines whether the contact point under test is consistent with the test signal sent by the FPGA based on the feedback signal. If they are consistent, the connection is normal. If the contact point under test maintains a constant value and does not change with the test signal sent by the FPGA, the connection is abnormal.

2. The detection circuit according to claim 1, characterized in that: The detection circuit further includes a switch circuit, wherein an input port connected to the switch circuit is connected to a high voltage power supply, an output port of the switch circuit is connected to a high voltage terminal of a connector, and a second output end of the FPGA is connected to a control port of the switch circuit. Before the detection circuit detects, the FPGA controls the switch circuit to be in a disconnected state. When the detection circuit detects that the connector and the cable are connected normally, the FPGA controls the switch circuit to be in a connected state.

3. The detection circuit according to claim 2, characterized in that: The test signals output by the FPGA are low level signals and high level signals. When the FPGA outputs a high-level signal and the feedback signal is a low-level signal, the FPGA outputs a low-level signal again, and when the feedback signal is a low-level signal, it is determined that the tested contact point is a grounding point, and the cable and connector of the print head are abnormally connected; When the FPGA outputs a high-level signal and the feedback signal is a high-level signal, it is determined that the tested contact point is not a grounding point and the cable and connector of the print head are connected normally.

4. The detection circuit according to claim 3, characterized in that: The print head has four cables, each cable has 16 contact points, the 16 contact points include one or more grounding points, and the grounding points of each cable are located at different positions.

5. A method for detecting a printing nozzle, characterized in that: The method comprises the following steps: the FPGA outputs a test signal which is sent to the contact point under test through an isolation circuit and a ground terminal; the contact point under test sends a feedback signal to the FPGA according to the test signal; the FPGA determines whether the contact point under test is consistent with the test signal sent by the FPGA according to the feedback signal; if they are consistent, the connection is normal; if the contact point under test maintains a constant value and does not change with the test signal sent by the FPGA, the connection is abnormal.

6. The detection method according to claim 5, characterized in that: Before the detection circuit detects, the FPGA controls the switch circuit to be in a disconnected state. When the detection circuit detects that the connector and the cable are connected normally, the FPGA controls the switch circuit to be in a connected state.

7. The detection method according to claim 6, characterized in that: The detection method is specifically as follows: when the FPGA outputs a high-level signal and the feedback signal is a low-level signal, then the FPGA outputs a low-level signal again. When the feedback signal is a low-level signal, it is judged that the tested contact point is a grounding point and the cable and connector of the print head are abnormally connected; when the FPGA outputs a high-level signal and the feedback signal is a high-level signal, it is judged that the tested contact point is not a grounding point and the cable and connector of the print head are normally connected.

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