Offset printing on-line ink-jet head protection device

Abstract

The utility model discloses a kind of offset printing line code head protection devices, relating to offset printing machine technical field, including the stop component in the upper portion of the negative pressure action area of the inner chamber of roller, and stop component is located in the movement path of printing paper tail end swing towards code head, to when printing paper tail end moves towards code head, stop component is used to stop printing paper tail end. The utility model can effectively intercept the abnormal movement of paper tail end, prevent paper tail end from contacting or polluting code head due to excessive swing, thereby reduce printing defects and equipment damage risk, improve the overall stability of production efficiency and printing quality.

Description

Technical Field

[0001] This utility model relates to the field of offset printing machine technology, specifically to a protective device for offset printing line inkjet printing. Background Technology

[0002] On the offset printing production line, the rollers have a structure with multiple sets of evenly distributed through holes on their surface. Simultaneously, two sets of negative pressure components are installed at the top of the roller, located at opposite ends of the top. These components generate a constant negative pressure at the midpoint between the two ends. This negative pressure area is located in the upper part of the roller's inner cavity (preferably occupying one-quarter of the inner cavity). This layout, viewed from above, can be... Figure 1 To represent, the side view layout state can be represented by Figure 2 To represent, the working state of the side view layout can be represented by... Figure 3 The following symbols are used to represent the negative pressure: arrows indicate the direction of negative pressure application; 101 represents the roller; 102 represents the negative pressure component; 103 represents the inkjet printer described below; 104 represents the inkjet printer's printhead; and 105 represents the negative pressure application area within the roller's inner cavity. Figure 2 (The part enclosed by the dashed line) 106 represents the paper grippers on the roller, and a represents the printing paper. When a constant negative pressure is generated at the middle position of the two sets of negative pressure components, since multiple sets of through holes are evenly distributed on the surface of the roller, the negative pressure generated in the upper part of the inner cavity of the roller will generate a corresponding negative pressure effect on the through holes that move to its upper position. That is, only the through holes located in the upper part of the roller have a negative pressure effect.

[0003] Typically, a roller is equipped with several sets of inkjet printers. During maintenance, the printers are positioned above the roller, and the inkjet headers are not in operation. During normal operation, the printers move downwards towards the roller until the distance between the inkjet header and the upper surface of the roller is within the coding range. The downward suction of the printing paper through the through-holes at the upper part of the roller stabilizes the paper and allows for precise coding.

[0004] After the coding is completed, the rotation of the roller can detach the printed paper from the roller. During this detachment process, because the distance between the inkjet pad and the upper surface of the roller is small, the tail of the printed paper will often come into contact with or scrape the inkjet pad. This contact or scraping action will damage the inkjet pad and interfere with the subsequent coding work of the inkjet pad. Utility Model Content

[0005] The purpose of this utility model is to solve the problems in the prior art by proposing a protective device for the inkjet printing nozzle in offset printing. By setting a stop component between the negative pressure area inside the cylinder and the inkjet printing nozzle, the device interferes with the swinging motion of the end of the printing paper, thereby preventing the printing paper from contacting or scraping the inkjet printing nozzle.

[0006] To solve the above problems, this utility model provides the following technical solution: A protective device for the inkjet printing line includes a stop assembly located above the negative pressure area inside the cylinder. The stop assembly is positioned in the movement path of the printing paper tail end swinging toward the inkjet printing line, so that the stop assembly can stop the printing paper tail end when it moves toward the inkjet printing line.

[0007] As a further aspect of this invention, the stop assembly is used to apply a passive stop effect to the printing paper.

[0008] As a further embodiment of this utility model: the stop assembly includes a bracket located above the drum and a roller rotatably mounted on the bracket. The roller is located between the negative pressure area inside the drum and the spray nozzle, and the rotation axis of the roller is parallel to the rotation axis of the drum.

[0009] As a further embodiment of this utility model: the position of the bracket is adjustable so that the distance between the roller in the negative pressure area of ​​the drum cavity and the spray nozzle is adjustable.

[0010] As a further embodiment of this invention, the bracket is slidably mounted on the inkjet printer along the vertical direction.

[0011] As a further embodiment of this invention, the stop assembly is used to apply an active stop effect to the printing paper.

[0012] As a further embodiment of this utility model: the stop assembly includes a nozzle located between the negative pressure area inside the cylinder and the spray nozzle. The nozzle can generate downward air pressure on the negative pressure area inside the cylinder so that when the tail end of the printed paper moves toward the spray nozzle, the downward air pressure is used to resist the upward swinging action of the tail end of the printed paper.

[0013] As a further embodiment of this invention, the stop assembly also includes an air pipe fixedly installed on the inkjet printer, the air pipe being used for connecting and installing the nozzle.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. By setting the stop assembly above the negative pressure area inside the cylinder and in the movement path of the printing paper tail end swinging towards the inkjet nozzle, it can effectively intercept abnormal movement of the paper tail end, prevent the paper tail end from swinging excessively and contacting or contaminating the inkjet nozzle, thereby reducing printing defects and equipment damage risks, and improving production efficiency and overall stability of printing quality.

[0015] 2. By applying a passive stopping effect through a limited stop component, this passive mechanism relies on the paper's own movement force to trigger the stop. It does not require external energy or a complex control system, has a simple and reliable structure, and reduces equipment costs and maintenance requirements.

[0016] 3. Under the passive stop design, the limited stop components include a bracket and rollers. The rollers are designed to contact the paper in a rolling manner, minimizing friction and static electricity generation, preventing scratches on the paper surface or ink smudging. At the same time, the layout of the rollers parallel to the roller axis ensures coordination with the roller movement, making the stopping process at the end of the paper smoother and more uniform.

[0017] 4. The adjustable bracket position allows for flexible adjustment of the distance between the rollers and the negative pressure area and the inkjet nozzle according to paper type, size, or printing speed, thereby optimizing the stopping effect, adapting to different production conditions, and improving the flexibility and efficiency of the production line.

[0018] 5. By applying an active stop effect through the limited stop component, this mechanism actively controls the movement of the paper tail end through external force, which can respond to paper swing more quickly and accurately. Especially in high-speed printing environment, it effectively prevents the paper tail end from curling up or shifting.

[0019] 6. With active stop design, the stop assembly includes a nozzle to generate downward air pressure. By using non-contact air pressure, physical contact with the paper is avoided, thereby completely eliminating potential damage to the paper surface. At the same time, the air pressure can be generated and adjusted quickly to precisely resist the upward swinging force of the paper, which is suitable for thin paper or sensitive materials. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings.

[0021] Figure 1 This is a top view of the existing technology's roller and two sets of negative pressure components. Figure 2 This is a side view of the existing technology's roller and two sets of negative pressure components. Figure 3 This is a side view of the working structure of the roller and two sets of negative pressure components in the prior art; Figure 4 This is a side view schematic diagram of the passive stop structure of this utility model; Figure 5 This is a schematic diagram of the active stop side test structure of this utility model.

[0022] In the diagram: 101, roller; 102, negative pressure component; 103, inkjet printer; 104, inkjet nozzle; 105, negative pressure area inside the roller cavity; 106, gripper; 2, stop assembly; 201, bracket; 202, roller; 203, nozzle; 204, air pipe; a, printing paper. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0024] like Figures 4-5 As shown, in the aforementioned area formed by the roller 101, negative pressure component 102, inkjet printer 103, inkjet nozzle 104, and negative pressure action zone within the roller cavity ( Figure 2 In the offset printing inkjet printing system consisting of components such as the dotted line frame (105) and the gripper 106 on the roller 101, this application provides an offset printing inline inkjet printing dock protection device. This device is used to interfere with and stop the swinging motion of the end of the printing paper a when the gripper 106 on the roller 101 carries the printing paper a away from the roller 101 after inkjet printing is completed, so as to prevent it from scraping the inkjet printing dock 104 above.

[0025] Specifically, a protective device for offset printing inline inkjet printer terminals includes a stop assembly 2. Based on the aforementioned spatial layout of the inkjet printer 103 and the roller 101, the stop assembly 2 is positioned above the negative pressure area 105 inside the roller cavity, and is located in the movement path of the printing paper a swinging towards the inkjet printer terminal 104. Figure 4 In the indicated state, the left end of the printing paper a is fixed by the gripper 106 on the roller 101. Therefore, after the coding is completed, the counterclockwise rotation of the roller 101 can drive the printing paper a to move to the left. Since the right end of the printing paper a is in a free state, during this rotation, the tail end of the printing paper a often moves towards the upper inkjet pad 104. At this time, the stop assembly 2 can stop the tail end of the printing paper a to prevent the tail end of the printing paper a from scraping the inkjet pad 104.

[0026] This application proposes the following two types of stop components, as follows: (1) The stop assembly 2 is used to apply a passive stop to the printing paper a; (2) The stop assembly 2 is used to apply an active stop to the printing paper a.

[0027] Under passive stop design, such as Figure 4 As shown, the stop assembly 2 includes a bracket 201 located above the drum 101 and a roller 202 rotatably mounted on the bracket 201. The roller 202 is located between the negative pressure area 105 inside the drum and the spray nozzle 104, and the rotation axis of the roller 202 is parallel to the rotation axis of the drum 101. This state can be achieved by... Figure 4To illustrate, when the tail end of the printing paper a moves toward the upper spray nozzle 104, the tail end of the printing paper a will contact the roller 202. Since the rotation axis of the roller 202 is parallel to the rotation axis of the roller 101, the tail end of the printing paper a will be in rolling contact with the roller 202. Subsequently, the roller 202 can roll with the swing of the tail end of the printing paper a, avoiding damage to the printing paper a caused by hard contact friction.

[0028] Preferably, the position of the bracket 201 is set to be adjustable, that is, the distance between the roller 202 and the negative pressure area 105 inside the cylinder cavity and the spray nozzle 104 is adjustable. This design can adapt to the swinging motion of the tail end of different types of printing paper a.

[0029] Furthermore, with the inkjet printer 103 in place, the bracket 201 is movably mounted on the inkjet printer 103, using the inkjet printer 103 as the mounting carrier. Preferably, the bracket 201 is slidably mounted along the vertical direction, and a scale mark (not shown in the figure) is set on the inkjet printer 103 along the vertical direction, so that precise adjustment can be achieved subsequently using the scale mark.

[0030] Under active stop design, such as Figure 5 As shown, the stop assembly 2 includes a nozzle 203 located between the negative pressure area 105 inside the roller cavity and the spray nozzle 104. The nozzle 203 can generate downward air pressure on the negative pressure area 105 inside the roller cavity. When the tail end of the printed paper a moves towards the spray nozzle 104, this downward air pressure is used to counteract the upward swinging action of the tail end of the printed paper a, preventing the tail end of the printed paper a from scraping against the spray nozzle 104. The magnitude of this downward air pressure can be adjusted according to the corresponding type of printed paper a, and its opening and closing can also be controlled by the rotation speed of the roller 101, sensors, and controllers, etc. This is prior art, and will not be elaborated here to avoid unnecessary detail.

[0031] Preferably, in addition to the inkjet printer 103, the stop assembly 2 further includes an air pipe 204. The air pipe 204 is mounted on the inkjet printer 103 and is connected to the nozzle 203. The air pipe 204 is used to supply gas at a certain pressure to the nozzle 203. Alternatively, the air pipe 204 can be configured as a multi-port type, with corresponding connection ports set according to the number of nozzles 203 to be installed. For example, in a three-port type, one end is connected to the corresponding pipe of the air compressor, and the other two ends are connected to install two nozzles 203.

[0032] The above description provides a detailed account of one embodiment of the present invention. However, this description is merely a preferred embodiment and should not be construed as limiting the scope of the present invention. All equivalent variations and improvements made within the scope of the claims of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A protective device for offset printing line inkjet printing terminals, characterized in that, The device includes a stop assembly (2) located above the negative pressure area (105) inside the cylinder cavity, and the stop assembly (2) is located in the movement path of the printing paper (a) swinging toward the spray nozzle (104) so ​​that when the printing paper (a) moves toward the spray nozzle (104), the stop assembly (2) is used to stop the printing paper (a) at the end.

2. The offset printing line inkjet printing protective device according to claim 1, characterized in that, The stop assembly (2) is used to apply a passive stop to the printing paper (a).

3. A protective device for offset printing line inkjet printing terminals according to claim 2, characterized in that, The stop assembly (2) includes a bracket (201) located above the drum (101) and a roller (202) rotatably mounted on the bracket (201). The roller (202) is located between the negative pressure area (105) inside the drum cavity and the spray nozzle (104), and the rotation axis of the roller (202) is parallel to the rotation axis of the drum (101).

4. A protective device for offset printing line inkjet printing terminals according to claim 3, characterized in that, The position of the bracket (201) is adjustable so that the distance between the roller (202) and the spray nozzle (104) in the negative pressure area (105) inside the roller cavity is adjustable.

5. A protective device for offset printing line inkjet printing terminals according to claim 4, characterized in that, The bracket (201) is slidably mounted on the inkjet printer (103) in the vertical direction.

6. A protective device for offset printing line inkjet printing terminals according to claim 1, characterized in that, The stop assembly (2) is used to apply an active stop to the printing paper (a).

7. A protective device for offset printing line inkjet printing terminals according to claim 6, characterized in that, The stop assembly (2) includes a nozzle (203) located between the negative pressure area (105) inside the cylinder and the spray nozzle (104). The nozzle (203) can generate downward air pressure on the negative pressure area (105) inside the cylinder so that when the end of the printed paper (a) moves toward the spray nozzle (104), the downward air pressure is used to resist the upward swinging action of the end of the printed paper (a).

8. A protective device for offset printing line inkjet printing terminals according to claim 7, characterized in that, The stop assembly (2) also includes an air pipe (204) fixedly installed on the inkjet printer (103), the air pipe (204) being used to connect the nozzle (203) for installation.

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