A printhead anti-collision device and digital printing equipment

Abstract

This utility model applies to the field of collision prevention, providing a printhead anti-collision device and digital printing equipment. The printhead anti-collision device includes: an anti-collision mounting base; an anti-collision baffle, disposed on the anti-collision mounting base and partially extending beyond the bottom of the mounting base, the baffle having a light-transmitting hole, which deflects when the baffle is subjected to force; and a through-beam photoelectric sensor electrically connected to a control board, including a transmitter and a receiver, disposed on the anti-collision mounting base and positioned on opposite sides of the light-transmitting hole. The photoelectric signal emitted by the transmitter passes through the light-transmitting hole to reach the receiver. When the baffle deflects the light-transmitting hole, the control board issues a touch alarm signal. The printhead anti-collision device provided by this utility model combines mechanical and photoelectric sensing detection, resulting in extremely high obstacle detection sensitivity, effectively protecting the printhead, reducing printhead damage rates during production, and extending printhead lifespan.

Description

Technical Field

[0001] This utility model belongs to the field of anti-collision, and particularly relates to a printhead anti-collision device and digital printing equipment. Background Technology

[0002] When digital printing equipment is in operation, the printing carriage reciprocates left and right at a certain height above the printing platform to print. During the printing process, situations may occur such as the printing media cracking, bulging, wrinkling, or foreign objects falling onto the platform. If the printing carriage continues to move over these bulges or fallen objects, it may damage the printhead, and in severe cases, damage the printing carriage or printing platform itself. To avoid these phenomena, a printhead collision protection system is installed on both sides of the reciprocating printing carriage. Traditional printhead collision structures are purely mechanical. Their principle is as follows: when the anti-collision plate touches a foreign object, the carriage anti-collision plate rotates clockwise around the hinge axis. When the carriage anti-collision plate touches the microswitch contact, it triggers the on / off signal inside the microswitch. The PLC detects this on / off signal and immediately outputs a signal to stop the carriage, thus preventing damage to components from foreign objects. Purely mechanical anti-collision systems have at least the following drawbacks: they are not sensitive enough. The anti-collision plate of the vehicle is triggered by a micro switch, which requires a large force and a large displacement of the anti-collision plate to trigger. Therefore, it often happens that a certain amount of medium has accumulated under the vehicle's bottom plate before the micro switch is triggered, which increases the risk of damage to the nozzle. Utility Model Content

[0003] This utility model provides a nozzle anti-collision device, which aims to solve the problem that the purely mechanical anti-collision in the prior art is not sensitive enough and thus has an excessive risk of nozzle damage.

[0004] This utility model is implemented as follows: a nozzle anti-collision device includes:

[0005] Anti-collision mounting bracket, used to fix the printing carriage to the side in the direction of movement;

[0006] A collision protection plate is provided on the collision protection mounting base and extends partially beyond the bottom of the collision protection mounting base. The collision protection plate is provided with a light-transmitting hole, and the light-transmitting hole can be deflected when the collision protection plate is subjected to force.

[0007] A through-beam photoelectric sensor, electrically connected to a control board, includes a transmitter and a receiver. The transmitter and receiver are mounted on the anti-collision mounting base and are located on opposite sides of the light-transmitting hole. The photoelectric signal emitted by the transmitter passes through the light-transmitting hole and reaches the receiver. When the anti-collision baffle causes the light-transmitting hole to deflect, the control board emits a touch alarm signal.

[0008] Furthermore, the through-beam photoelectric sensor is an optical fiber sensor, and the nozzle anti-collision device also includes an optical fiber amplifier. The transmitting end of the optical fiber sensor is connected to the input end of the optical fiber amplifier, the receiving end of the optical fiber sensor is connected to the first output end of the optical fiber amplifier, and the second output end of the optical fiber amplifier is electrically connected to the control board. The optical fiber amplifier is used to set a preset threshold. The preset threshold is less than the light received by the receiving end. When the light received by the receiving end is less than the preset threshold, the optical fiber amplifier outputs a control signal to the control board.

[0009] Furthermore, the anti-collision baffle includes several spliced ​​anti-collision units, each of the anti-collision units is provided with a light-transmitting hole, and the light-transmitting holes of each of the anti-collision units are coaxially arranged.

[0010] Furthermore, the anti-collision baffle has the ability to deform under force. When the anti-collision baffle is subjected to force, the anti-collision baffle deforms and causes the light-transmitting hole to deflect.

[0011] Furthermore, the anti-collision baffle has an L-shaped structure, including a blocking part and a connecting part that are connected to each other. The blocking part extends out of the bottom of the anti-collision mounting base, the light-transmitting hole is located on one side of the blocking part, and the connecting part is connected and fixed to the anti-collision mounting base.

[0012] Furthermore, the portion of the blocking part extending beyond the anti-collision mounting base is inclined toward the side opposite to the printing carriage.

[0013] Furthermore, the nozzle anti-collision device also includes a baffle mounting strip. The anti-collision mounting base includes a first mounting part and a second mounting part disposed on one side of the first mounting part. The blocking part is attached to the side of the first mounting part facing the printing carriage and extends out of the first mounting part. The blocking part is fixed to the second mounting part by the baffle mounting strip.

[0014] Furthermore, the anti-collision mounting base also includes a third mounting part connected to the second mounting part and disposed opposite to the first mounting part, the third mounting part being provided with a cable passage for the transmitter and the receiver.

[0015] Furthermore, the anti-collision mounting base is provided with a fixed shaft arranged parallel to the axis of the light-transmitting hole, and the transmitting end and the receiving end pass through the fixed shaft.

[0016] This utility model also provides a digital printing device, including a printing carriage and the aforementioned printhead anti-collision device. The printing carriage is provided with a plurality of printheads for spraying ink, and the anti-collision mounting base of the printhead anti-collision device is located on the bottom side of the printing carriage in the reciprocating movement direction.

[0017] The beneficial effects achieved by this invention are as follows: By setting a light-transmitting hole on the anti-collision baffle and using a through-beam photoelectric sensor to position the transmitter and receiver on opposite sides of the light-transmitting hole, the light beam emitted by the transmitter passes through the light-transmitting hole and is then transmitted to the receiver. When the anti-collision baffle is subjected to force, causing the light-transmitting hole to deflect, the light beam emitted by the transmitter is partially blocked, and the photoelectric signal received by the receiver changes. This causes the control board to detect the change in the photoelectric signal input by the transmitter and the light signal received by the receiver, thus generating an alarm. This design allows for a change in the photoelectric signal input by the transmitter and the photoelectric signal received by the receiver to be generated even with a slight deflection of the anti-collision baffle, i.e., even when the deflection angle of the current obstacle on the anti-collision baffle is small, thus generating an alarm. It has high detection sensitivity and can effectively protect the nozzle. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of a nozzle anti-collision device provided by this utility model;

[0019] Figure 2 yes Figure 1 A cross-sectional view of point AA under normal conditions;

[0020] Figure 3 yes Figure 1 Cross-sectional view of point AA under impact conditions;

[0021] Figure 4 This is a structural diagram of the baffle mounting strip and anti-collision baffle of a nozzle anti-collision device provided by this utility model;

[0022] Figure 5 This is another perspective view of the anti-collision device for nozzles provided by this utility model;

[0023] Figure 6 This is a structural diagram of the through-beam sensor and fixed shaft of a nozzle anti-collision device provided by this utility model.

[0024] 1. Anti-collision mounting base; 11. First mounting part; 12. Second mounting part; 13. Third mounting part; 131. Cable tray; 132. Mounting hole; 2. Anti-collision baffle; 2a. Anti-collision unit; 2a1. Blocking part; 2a2. Connecting part; 21. Light transmission hole; 3. Through-beam photoelectric sensor; 31. Transmitting end; 311. Beam; 32. Receiving end; 4. Baffle mounting strip; 5. Fixed shaft; 6. Sensor mounting base. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0026] See Figures 1-3 This utility model provides a nozzle anti-collision device, including an anti-collision mounting base 1, an anti-collision baffle 2, and a through-beam photoelectric sensor 3. The anti-collision mounting base 1 is fixed to the side of a printing carriage (not shown) in the direction of movement. The printing carriage is equipped with several nozzles (not shown) for spraying liquids (including but not limited to ink). The anti-collision baffle 2 is disposed on the anti-collision mounting base 1 and partially extends beyond the bottom of the anti-collision mounting base 1, allowing the anti-collision baffle 2 to extend a preset distance towards the printing medium to ensure that the anti-collision baffle 2 can contact obstacles on the printing medium. The anti-collision baffle 2 is provided with a light-transmitting hole 21, which allows the anti-collision baffle 2 to be pulled forward when subjected to force. When the light-transmitting aperture 21 deflects, the through-beam photoelectric sensor 3 is electrically connected to the control board (not shown in the figure). The control board is the control module of the digital printing equipment where the printing carriage is located. The through-beam photoelectric sensor 3 includes a transmitter 31 and a receiver 32. The transmitter 31 and the receiver 32 are located on the anti-collision mounting base 1 and are located on opposite sides of the light-transmitting aperture 21. The photoelectric signal emitted by the transmitter 31 reaches the receiver 32 after passing through the light-transmitting aperture 21. When the anti-collision baffle 2 causes the light-transmitting aperture 21 to deflect, the control board issues a touch alarm signal.

[0027] By setting a light-transmitting hole 21 on the anti-collision baffle 2 and using a through-beam photoelectric sensor 3 to position the transmitter 31 and receiver 32 on opposite sides of the light-transmitting hole 21, the light beam 311 emitted by the transmitter 31 passes through the light-transmitting hole 21 and is then transmitted to the receiver 32. When the anti-collision baffle 2 is subjected to force, causing the light-transmitting hole 21 to deflect, the light beam 311 emitted by the transmitter is partially blocked, and the photoelectric signal received by the receiver 32 changes. This causes the control board to detect the change in the photoelectric signal input by the transmitter 31 and the light signal received by the receiver 32, thereby generating an alarm. This design allows the anti-collision baffle 2 to change the photoelectric signal input by the transmitter 31 and the photoelectric signal received by the receiver 32 even with a slight deflection, i.e., a small deflection angle caused by the obstacle, thus generating an alarm. It has high detection sensitivity and can effectively protect the nozzle.

[0028] The nozzle anti-collision device provided by this utility model adopts mechanical and photoelectric sensing detection, which makes the obstacle detection sensitivity extremely high, effectively protecting the nozzle, reducing the nozzle damage rate during production, and extending the nozzle service life.

[0029] Furthermore, the light-transmitting hole 21 is a strip-shaped hole with its long axis set vertically. This allows for effective vertical compatibility between the installation of the transmitter 31 and the receiver 32, reducing the installation difficulty of the receiver 32 and the transmitter 31.

[0030] Furthermore, the through-beam photoelectric sensor 3 is a fiber optic sensor, and the nozzle anti-collision device also includes a fiber optic amplifier (not shown in the figure). The transmitting end 31 of the fiber optic sensor is connected to the input end of the fiber optic amplifier, the receiving end 32 of the fiber optic sensor is connected to the first output end of the fiber optic amplifier, and the second output end of the fiber optic amplifier is electrically connected to the control board. The fiber optic amplifier is used to set a preset threshold, which is less than the light received by the receiving end 32. When the light received by the receiving end 32 is less than the preset threshold, the fiber optic amplifier outputs a control signal to the control board. By selecting a fiber optic sensor as the detection element in the through-beam photoelectric sensor 3 and setting the fiber optic amplifier to work in conjunction with the fiber optic sensor, the preset threshold set by the fiber optic amplifier is compared with the light received by the receiving end of the fiber optic sensor, and the result is output to the control board. This allows the control board to determine whether to trigger an alarm signal based on the received signal, thereby adjusting the sensitivity of obstacle detection.

[0031] Specifically, the fiber optic amplifier receives and converts the light source signals from the transmitter 31 and receiver 32, then outputs a control signal to the control board. During use, trigger parameters are set in the fiber optic amplifier, i.e., a preset threshold is set based on the amount of light received by the receiver 32 from the transmitter 31. For example, if the amount of light received by the receiver 32 from the transmitter 31 at the factory is 7735mW, then the preset threshold can be any value less than 7735mW, such as 7500mW, 7300mW, 7000mW, etc. In this embodiment, a preset threshold of 7000mW is used as an example. When the anti-collision baffle 2 does not contact an obstacle, the beam 311 emitted by the transmitter reaches the receiver through the light-transmitting hole 21 (see...). Figure 2 The fiber optic amplifier detected that the input light intensity at the transmitter 31 was 7735 mW, and the received light intensity at the receiver 32 was also 7735 mW. When the anti-collision baffle 2 touched an obstacle, the anti-collision baffle 2 caused the light transmission hole 21 to deflect, and the light beam 311 emitted by the transmitter 31 was partially blocked (see...). Figure 3 At this time, the amount of light received by the receiver is less than 7735mW. When the amount of light received is less than 7000mW, the fiber optic amplifier sends a control signal to the control board, and the control board issues an alarm signal.

[0032] It should be noted that the closer the set threshold of the fiber optic amplifier is to the light received value of the receiver 32, the higher the sensitivity. The preset threshold can be set according to the actual detection sensitivity requirements, and is not limited here.

[0033] See Figure 4 Furthermore, the anti-collision baffle 2 comprises several spliced ​​anti-collision units 2a, each anti-collision unit 2a having a light-transmitting hole 21, and the light-transmitting holes 21 of each anti-collision unit 2a are coaxially arranged. Based on the arrangement of the light-transmitting holes 21 and the detection method of the through-beam photoelectric sensor 3 cooperating with the light-transmitting holes 21, the anti-collision baffle 2 can be divided into multiple anti-collision units 2a spliced ​​together. Thus, when there is an obstacle in a local position on the printing medium, the obstacle can cause the corresponding anti-collision unit 2a on the anti-collision baffle 2 to deflect. After the current anti-collision unit 2a deflects, the light-transmitting hole 21 on it can also block part of the light beam 311, thereby causing the control board to issue an alarm signal. Compared with the traditional photoelectric switch method, which requires the anti-collision baffle 2 to adopt an integral structure, this design scheme makes it easier to detect the presence of local obstacles on the printing medium, has higher obstacle detection efficiency, and can more effectively protect the printhead from collisions.

[0034] Furthermore, the anti-collision plate 2 has the ability to deform under force. When the anti-collision plate 2 is subjected to force, it deforms and causes the light-transmitting hole 21 to deflect. Thus, when the anti-collision plate 2 touches an obstacle, only a small obstacle force is needed to cause the light-transmitting hole 21 to shift due to the deformation of the anti-collision plate 2 itself. There is no need to set up an installation structure that causes the anti-collision plate 2 to shift its position as a whole, nor is there a need to set up additional elastic elements to reset the anti-collision plate 2 after it has shifted. This not only simplifies the structure to improve the reliability of the device and saves costs, but also reduces the difficulty of the anti-collision plate 2 causing the light-transmitting hole 21 to shift, thereby further improving the sensitivity of obstacle detection.

[0035] See Figure 3 Specifically, the anti-collision baffle 2 has an L-shaped structure, including an interconnected blocking part 2a1 and a connecting part 2a2. Each anti-collision unit 2a has the same L-shaped structure. The blocking part 2a1 extends beyond the bottom of the anti-collision mounting base 1, and a light-transmitting hole 21 is located on one side of the blocking part 2a1. The connecting part 2a2 is connected and fixed to the anti-collision mounting base 1. Thus, the L-shaped blocking part 2a1 and connecting part 2a2 have a bent structure. Compared to a straight structure, this structure has better elasticity and is more prone to elastic deformation when it encounters an obstacle, further improving the sensitivity of obstacle detection.

[0036] See Figure 3Furthermore, the portion of the blocking part 2a1 extending beyond the anti-collision mounting base 1 is tilted towards the side opposite to the printing carriage. Thus, during the movement of the printing carriage, when encountering an obstacle, the tilted portion of the blocking part 2a1 will contact the obstacle first, providing sufficient time for the control board to receive the signal and issue an alarm response, effectively further enhancing the protection of the printhead. In addition, the blocking part 2a1 itself also forms a bent structure, which further improves the elastic deformation capability of the anti-collision baffle 2, further enhancing the sensitivity of obstacle detection.

[0037] Furthermore, the printhead anti-collision device also includes a baffle mounting strip 4. The anti-collision mounting base 1 includes a first mounting part 11 and a second mounting part 12 located on one side of the first mounting part 11. The blocking part 2a1 is attached to the side of the first mounting part 11 facing the printing carriage and extends out of the first mounting part 11. The first mounting part 11 can support the blocking part 2a1 on the side located on the non-load-bearing surface (i.e., the side facing the printing carriage), preventing accidental contact and thus preventing false alarms. The blocking part 2a1 is mounted by the baffle. The mounting strip 4 is fixed on the second mounting part 12. When installing the anti-collision baffle 2 and the nozzle anti-collision device, several anti-collision units 2a can be fixed to the baffle mounting strip 4 first, and the light transmission holes 21 can be aligned coaxially. Then, the baffle mounting strip 4 is fixed on the second mounting part 12. Compared with the method of directly fixing several anti-collision units 2a of the anti-collision baffle 2 to the anti-collision mounting base 1 in sequence, this solution can facilitate the installation of several anti-collision units on the anti-collision mounting plate and ensure that the light transmission holes 21 of several anti-collision units are aligned.

[0038] See Figure 3 , Figure 5 Furthermore, the anti-collision mounting base 1 also includes a third mounting part 13 connected to the second mounting part 12 and disposed opposite to the first mounting part 11. The third mounting part 13 is provided with a wire passage groove 131 for the transmitter 31 and the receiver 32. The wire passage groove 131 facilitates the routing of the transmitter 31 and the receiver 32, which is beneficial to the simplification of the routing layout.

[0039] Furthermore, the third mounting part 13 is also provided with mounting holes 132 for fixing the anti-collision mounting base 1 to the printing carriage. The mounting holes 132 facilitate the installation and fixing of the anti-collision mounting base 1 and the printing carriage.

[0040] See Figure 3 , Figure 6Furthermore, the anti-collision mounting base 1 is provided with a fixed shaft 5 arranged parallel to the axis of the light transmission hole 21, and the transmitter 31 and receiver 32 pass through the fixed shaft 5. In this way, the fixed shaft 5 can be used to position the transmitter 31 and receiver 32, that is, the transmitter 31 and receiver 32 can be ensured to be on the same horizontal line. In addition, the fixed shaft 5 can also provide space for adjusting the angle of the transmitter 31 and receiver 32. Compared with directly mounting the transmitter 31 and receiver 32 on the anti-collision mounting base 1, this design can reduce the difficulty of adjusting the signal of the transmitter 31 and receiver 32 after installation.

[0041] See Figure 6 Specifically, two sensor mounting bases 6 are provided on opposite sides of the light-transmitting hole 21 on the fixed shaft 5, and the transmitting end 31 and the receiving end 32 are respectively mounted on one sensor mounting base 6.

[0042] This utility model embodiment also provides a digital printing device, including a printing carriage and the aforementioned printhead anti-collision device. The printing carriage is provided with a plurality of printheads for spraying ink, and the anti-collision mounting base 1 of the printhead anti-collision device is located on the bottom side of the printing carriage in the reciprocating movement direction.

[0043] The digital printing equipment provided by this utility model employs a combination of mechanical and photoelectric sensing detection, resulting in extremely high obstacle detection sensitivity. This effectively protects the printhead, reduces printhead damage during production, and extends printhead lifespan. The above description is merely a preferred embodiment of this utility model and is not intended to limit its scope. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within its protection scope.

Claims

1. A showerhead collision avoidance apparatus, comprising: include: Anti-collision mounting bracket, used to fix the printing carriage to the side in the direction of movement; A collision protection plate is provided on the collision protection mounting base and extends partially beyond the bottom of the collision protection mounting base. The collision protection plate is provided with a light-transmitting hole, and the light-transmitting hole can be deflected when the collision protection plate is subjected to force. A through-beam photoelectric sensor, electrically connected to a control board, includes a transmitter and a receiver. The transmitter and receiver are mounted on the anti-collision mounting base and are located on opposite sides of the light-transmitting hole. The photoelectric signal emitted by the transmitter passes through the light-transmitting hole and reaches the receiver. When the anti-collision baffle causes the light-transmitting hole to deflect, the control board emits a touch alarm signal.

2. The showerhead collision avoidance apparatus of claim 1, wherein The through-beam photoelectric sensor is an optical fiber sensor. The nozzle anti-collision device also includes an optical fiber amplifier. The transmitting end of the optical fiber sensor is connected to the input end of the optical fiber amplifier, the receiving end of the optical fiber sensor is connected to the first output end of the optical fiber amplifier, and the second output end of the optical fiber amplifier is electrically connected to the control board. The optical fiber amplifier is used to set a preset threshold. The preset threshold is less than the light received by the receiving end. When the light received by the receiving end is less than the preset threshold, the optical fiber amplifier outputs a control signal to the control board.

3. The showerhead collision avoidance apparatus of claim 1, wherein The anti-collision baffle includes several spliced ​​anti-collision units, each of which is provided with a light-transmitting hole, and the light-transmitting holes of each anti-collision unit are coaxially arranged.

4. The showerhead collision avoidance apparatus of claims 1 or 3, wherein, The anti-collision baffle has the ability to deform under force. When the anti-collision baffle is subjected to force, the anti-collision baffle deforms and causes the light-transmitting hole to deflect.

5. The showerhead collision avoidance apparatus of claim 4, wherein The anti-collision baffle has an L-shaped structure, including a blocking part and a connecting part that are connected to each other. The blocking part extends out of the bottom of the anti-collision mounting base, the light-transmitting hole is located on one side of the blocking part, and the connecting part is connected and fixed to the anti-collision mounting base.

6. The nozzle anti-collision device as described in claim 5, characterized in that, The portion of the blocking part extending beyond the anti-collision mounting base is tilted toward the side away from the printing carriage.

7. The showerhead collision avoidance apparatus of claim 5, wherein The nozzle anti-collision device also includes a baffle mounting strip. The anti-collision mounting base includes a first mounting part and a second mounting part disposed on one side of the first mounting part. The blocking part is attached to the side of the first mounting part facing the printing carriage and extends out of the first mounting part. The blocking part is fixed to the second mounting part by the baffle mounting strip.

8. The showerhead collision avoidance apparatus of claim 7, wherein The anti-collision mounting base also includes a third mounting part connected to the second mounting part and disposed opposite to the first mounting part, the third mounting part being provided with a cable passage for the transmitter and the receiver.

9. The showerhead collision avoidance apparatus of claim 1, wherein The anti-collision mounting base is provided with a fixed shaft arranged parallel to the axis of the light-transmitting hole, and the transmitting end and the receiving end pass through the fixed shaft.

10. A digital printing apparatus characterized by comprising: The device includes a printing carriage and a printhead anti-collision device as described in any one of claims 1-9, wherein the printing carriage is provided with a plurality of printheads for spraying ink, and the anti-collision mounting base of the printhead anti-collision device is located on the bottom side of the printing carriage in the reciprocating direction.

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