A print head position automatic adjustment device
By controlling the rotation of the eccentric shaft with a servo motor and using the left and right adjustment plates to automatically adjust the printhead, the problem of printhead installation accuracy relying on operator experience in existing technologies is solved, achieving precise, controllable, and uniform adjustment results.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI TONGYIN INKJET TECHNOLOGY CO LTD
- Filing Date
- 2025-09-22
- Publication Date
- 2026-07-21
AI Technical Summary
The installation precision of printheads in existing inkjet printers depends on the operator's experience, resulting in unpredictable, inconsistent, and unreproducible adjustment results.
The eccentric shaft is controlled by a servo motor, and the left and right positions and deflection angles of the print head are automatically adjusted by the left and right adjustment plates. Precise fine-tuning is achieved by using the combination of limit pins and the eccentric shaft.
It achieves precise and controllable control over the position and angle of the print head, with strong consistency and good reproducibility of adjustment results, reducing reliance on the operator's experience.
Smart Images
Figure CN224528283U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of inkjet printing equipment technology, and in particular to an automatic printhead position adjustment device. Background Technology
[0002] An inkjet printer has a base plate inside the printhead, on which the printheads are mounted. To meet the requirements of large-format, high-efficiency printing, several printhead groups are typically installed on the printhead mounting frame. Each printhead group contains several vertically staggered printheads. To ensure printing accuracy, the installation precision of the printheads is very high. The nozzles of the printheads are at the micrometer level, and the printheads require fine-tuning and calibration to ensure that the physical positions of the nozzles in the same row completely overlap and that the vertical spacing between the printheads meets the requirements. In actual printing, the pattern formed by the ink droplets ejected from the printhead must also be parallel to the edge of the printing medium in the same direction to ensure correct orientation of the printed pattern. However, due to assembly errors during installation, the edge of the printhead may deflect at a certain angle to the edge of the printing medium, thus requiring adjustment of the printhead deflection angle.
[0003] In existing technologies, a nozzle position adjustment structure is typically installed on the base plate, allowing manual adjustment of the nozzle's left and right position and deflection angle. For example, Chinese patent CN210161762U discloses a multi-nozzle position adjustment structure, which includes an industrial-grade nozzle, a nozzle mounting base plate, tapered screws, and nozzle fixing screws. The industrial-grade nozzle has a fastening through hole for connecting to the nozzle mounting base plate. Both ends of the industrial-grade nozzle have a lateral adjustment groove and an angle adjustment groove, respectively. The nozzle fixing screws connect the industrial-grade nozzle to the nozzle mounting base plate through the fastening through hole. The nozzle mounting base plate is connected to the multi-nozzle mounting assembly. When adjusting the position of the printhead in the aforementioned prior art, the printhead fixing screw is first loosened, and then the tapered screw is rotated with a screwdriver to bring the horizontal adjustment groove and the angle adjustment groove closer to or further away from the axis of the tapered screw, thereby achieving the adjustment of the position and angle of the industrial-grade printhead. However, the aforementioned prior art method of adjustment by operators relies more on the operator's experience and expertise, and the operation results vary depending on the operator. The adjustment results cannot be precisely controlled, are highly inconsistent, and are not easily replicated.
[0004] In view of this, the present invention provides an automatic printhead position adjustment device, which adjusts the left and right position and deflection angle of the printhead by controlling the rotation of the eccentric shaft through a servo motor. It has a compact structure and ingenious design, does not rely on the experience and expertise of the operator, and has the beneficial effects of accurate and controllable adjustment results, strong uniformity and strong reproducibility. Utility Model Content
[0005] The present invention aims to provide an automatic adjustment device for the position of a printer nozzle to overcome the shortcomings of the prior art. The technical problem to be solved by the present invention is achieved through the following technical solution.
[0006] An automatic printhead position adjustment device includes a base plate, a printhead, a servo motor, a left adjustment plate, a right adjustment plate, and an eccentric shaft. The left and right adjustment plates are respectively disposed at the left and right ends of the printhead. The printhead is mounted on the base plate via the left and right adjustment plates. The eccentric shaft is fixedly connected to the output end of the servo motor. The left adjustment plate is provided with a left elongated oval hole, and the right adjustment plate is provided with a right elongated oval hole. The axes of the left and right elongated oval holes are perpendicular to each other. There are two servo motors, which are respectively installed at the left and right ends of the base plate. After the servo motors are installed at the left and right ends of the base plate, their output ends face downwards, and the eccentric sections of the two eccentric shafts are respectively placed in the left and right elongated oval holes. A limit pin is provided on the front or rear side of the left adjustment plate.
[0007] Preferably, the base plate has mounting blocks at both ends of one diagonal and bosses at both ends of the other diagonal, and the servo motor is mounted above the mounting blocks and the bosses.
[0008] Preferably, pressure platforms are provided at both ends of one diagonal of the base plate, the mounting block is mounted on the pressure platforms, the limiting pin is mounted on the side of the pressure platforms facing the print head, and the ball head end abuts against the side of the left adjustment plate and the right adjustment plate respectively.
[0009] Preferably, the mounting block is provided with a plunger mounting hole, and a positioning plunger is installed in the plunger mounting hole, with the ball head of the positioning plunger facing downward and abutting against the print head.
[0010] Preferably, the bottom plate is provided with adjustment plate receiving grooves at its left and right ends, the adjustment plate receiving grooves are used to receive the left adjustment plate and the right adjustment plate, and the adjustment plate receiving grooves are provided with positioning holes.
[0011] Preferably, the eccentric shaft includes an eccentric section and a positioning section located below the eccentric section. After the two servos are mounted on the base plate, the eccentric section is placed in the left elongated hole and the right elongated hole respectively, and the positioning section is placed in the positioning hole.
[0012] In this invention, the print head is located above the printing medium, and a base plate mounting frame is provided at the bottom of the print head. The base plate is mounted on the base plate mounting frame, and the print head is mounted on the base plate. The long axis of the left elongated hole is longitudinal, and the long axis of the right elongated hole is transverse. When adjusting the left and right position of the print head, the printer's control system controls the servo motor on the left side of the base plate to operate, causing the eccentric shaft below the left servo motor to rotate. The rotation of the eccentric section of the left eccentric shaft drives the left adjustment plate to move left and right, thereby moving the print head and the right adjustment plate left and right. When the right servo motor is not operating, the eccentric section of the right eccentric shaft, in conjunction with the right elongated hole, limits and guides the left and right movement of the print head, preventing the right end of the print head from shifting forward or backward during left and right movement. The limiting pin on the side of the left adjustment plate also limits the left and right movement of the left adjustment plate, preventing the left end of the print head from shifting forward or backward during left and right movement, thus completing the fine adjustment of the left and right position of the print head. When adjusting the deflection angle of the print head, the printer's control system controls the servo motor on the right side of the base plate to rotate the eccentric shaft below the servo motor. The rotation of the eccentric section of the right eccentric shaft causes the right adjustment plate to move back and forth, which in turn causes the right end of the print head to move back and forth. This causes the print head to rotate around the eccentric shaft on the left end. At the same time, the limit pin restricts the back and forth movement of the left end of the print head, thus completing the fine adjustment of the print head's deflection angle.
[0013] This embodiment provides an automatic printhead position adjustment device that uses a servo motor to control the rotation of an eccentric shaft to adjust the left and right position and deflection angle of the printhead. The servo motor's deflection angle is precise and controllable, making the adjustment of the printhead position and deflection angle more accurate. The device has a compact structure and ingenious design, does not rely on the operator's experience or expertise, and has the beneficial effects of precise and controllable adjustment results, strong uniformity, and strong reproducibility. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the structure of this utility model;
[0015] Figure 2 This is a schematic diagram of the printing nozzle in this utility model;
[0016] Figure 3 This is a schematic diagram of the installation structure of the left and right adjustment plates in this utility model;
[0017] Figure 4 This is a schematic diagram of the structure of this utility model after the print head has been removed;
[0018] Figure 5 This is a schematic diagram of the structure of the bottom plate in this utility model;
[0019] Figure 6This is a schematic diagram of the servo motor and eccentric shaft in this utility model;
[0020] The reference numerals in the attached figures are as follows: 1. Base plate; 11. Nozzle mounting hole; 12. Pressure plate; 13. Adjustment plate receiving groove; 14. Boss; 15. Positioning hole; 2. Printing nozzle; 3. Servo motor; 4. Mounting block; 41. Plunger mounting hole; 5. Left adjustment plate; 51. Left oblong hole; 6. Right adjustment plate; 61. Right oblong hole; 7. Positioning plunger; 8. Limit pin; 9. Eccentric shaft; 91. Eccentric section; 92. Positioning section. Detailed Implementation
[0021] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.
[0022] An automatic printhead position adjustment device is improved in that it includes a base plate 1, a printhead 2, a servo motor 3, a left adjustment plate 5, a right adjustment plate 6, and an eccentric shaft 9. The left adjustment plate 5 and the right adjustment plate 6 are respectively disposed at the left and right ends of the printhead 2. The printhead 2 is mounted on the base plate 1 through the left adjustment plate 5 and the right adjustment plate 6. The eccentric shaft 9 is fixedly connected to the output end of the servo motor 3. The left adjustment plate 5 is provided with a left elongated oval hole 51, and the right adjustment plate 6 is provided with a right elongated oval hole 61. The axes of the left elongated oval hole 51 and the right elongated oval hole 61 are perpendicular to each other. There are two servo motors 3, which are respectively installed at the left and right ends of the base plate 1. After the servo motors 3 are installed at the left and right ends of the base plate 1, their output ends face downwards, and the eccentric sections 91 of the two eccentric shafts 9 are respectively placed in the left elongated oval hole 51 and the right elongated oval hole 61. A limit pin 8 is provided on the front or rear side of the left adjustment plate 5.
[0023] In this embodiment, the printer head is located above the printing medium, and a base plate mounting frame is provided at the bottom of the printer head. The base plate 1 is mounted on the base plate mounting frame, and the print head 2 is mounted on the base plate 1. The long axis of the left elongated hole 51 is longitudinal, and the long axis of the right elongated hole 61 is transverse. When adjusting the left and right position of the print head, the printer's control system controls the servo motor 3 on the left side of the base plate 1 to rotate the eccentric shaft 9 below the servo motor 3. The rotation of the eccentric section 91 of the eccentric shaft 9 causes the left adjustment plate 5 to move left and right, which in turn causes the print head 2 and the right adjustment plate 6 to move left and right. The right servo motor 3 is not working, so the eccentric section 91 of the right eccentric shaft 9 and the right elongated hole 61 play a limiting and guiding role in the left and right movement of the print head 2, so as to prevent the right end of the print head 2 from shifting back and forth when moving left and right. The limiting pin 8 on the side of the left adjustment plate 5 also plays a limiting role in the left and right movement of the left adjustment plate 5, so as to prevent the left end of the print head 2 from shifting back and forth during the left and right movement, thus completing the fine adjustment of the left and right position of the print head 2. When adjusting the deflection angle of the print head 2, the printer's control system controls the servo motor 3 on the right side of the base plate 1 to rotate the eccentric shaft 9 below the servo motor 3. As a result, the rotation of the eccentric section 91 of the right eccentric shaft 9 drives the right adjustment plate 6 to move back and forth, thereby driving the right end of the print head 2 to move back and forth. This causes the print head 2 to rotate around the left end of the eccentric shaft 9. At the same time, the setting of the limit pin 8 restricts the back and forth movement of the left end of the print head 2, thus completing the fine adjustment of the deflection angle of the print head 2.
[0024] Furthermore, mounting blocks 4 are provided at both ends of one diagonal of the base plate 1, and bosses 14 are provided at both ends of the other diagonal. The servo motor 3 is mounted above the mounting blocks 4 and the bosses 14.
[0025] Furthermore, pressure plates 12 are respectively provided at both ends of a diagonal of the base plate 1, the mounting block 4 is installed on the pressure plate 12, the limiting pin 8 is installed on the side of the pressure plate 12 facing the print head 2, and the ball end abuts against the side of the left adjustment plate 5 and the right adjustment plate 6 respectively.
[0026] Furthermore, the mounting block 4 is provided with a plunger mounting hole 41, and a positioning plunger 7 is installed in the plunger mounting hole 41. The ball head of the positioning plunger 7 faces downward and abuts against the printing nozzle 2.
[0027] In this embodiment, the positioning plunger 7 is an elastic plunger. After it is installed on the mounting block 4, the ball head at the lower end abuts against the print head 2, thereby pressing and fixing the print head 2 onto the base plate 1 from both ends of the diagonal. The position of the print head 2 is fixed by the setting of the left adjustment plate 5, the right adjustment plate 6, and the eccentric shaft 9.
[0028] In this embodiment, after the mounting block 4 is installed on the base plate 1, its upper end face is flush with the upper end face of the boss 14, which facilitates the installation of the servo motor 3. The positioning plunger 7 is pressed against the top of the print head 2, that is, part of the structure of the mounting block 4 needs to be placed above the print head 2. In order to facilitate the installation of the print head 2, the mounting block 4 is set separately, rather than being integrated with the base plate 1.
[0029] Furthermore, adjustment plate receiving grooves 13 are respectively provided at the left and right ends of the base plate 1. The adjustment plate receiving grooves 13 are used to accommodate the left adjustment plate 5 and the right adjustment plate 6. Positioning holes 15 are provided in the adjustment plate receiving grooves 13.
[0030] Furthermore, the eccentric shaft 9 includes an eccentric section 91 and a positioning section 92 located below the eccentric section 91. After the two servo motors 3 are installed on the base plate 1, the eccentric section 91 is placed in the left elongated hole 51 and the right elongated hole 61 respectively, and the positioning section 92 is placed in the positioning hole 15.
[0031] It should be noted that the above detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.
[0032] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments described in this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.
[0033] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.
[0034] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or apparatus.
[0035] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways, such as rotated 90 degrees or in other orientations, and the spatial relative descriptions used herein will be interpreted accordingly.
[0036] In the detailed description above, reference has been made to the accompanying drawings, which form part of this document. In the drawings, similar symbols typically identify similar parts unless the context otherwise indicates otherwise. The illustrated embodiments described in the detailed specification, drawings, and claims are not intended to be limiting. Other embodiments may be used and other changes may be made without departing from the spirit or scope of the subject matter presented herein.
[0037] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. An automatic printhead position adjustment device, characterized in that: The device includes a base plate (1), a print head (2), a servo motor (3), a left adjustment plate (5), a right adjustment plate (6), and an eccentric shaft (9). The left adjustment plate (5) and the right adjustment plate (6) are respectively located at the left and right ends of the print head (2). The print head (2) is mounted on the base plate (1) via the left adjustment plate (5) and the right adjustment plate (6). The eccentric shaft (9) is fixedly connected to the output end of the servo motor (3). The left adjustment plate (5) is provided with a left elongated hole (51). The right adjustment plate (6) is provided with a left elongated hole (51). The plate (6) is provided with a right elongated hole (61), and the axes of the left elongated hole (51) and the right elongated hole (61) are perpendicular to each other. There are two servo motors (3) and they are respectively installed at the left and right ends of the base plate (1). After the servo motors (3) are installed at the left and right ends of the base plate (1), their output ends face down, and the eccentric sections (91) of the two eccentric shafts (9) are respectively placed in the left elongated hole (51) and the right elongated hole (61). The front or rear side of the left adjustment plate (5) is provided with a limit pin (8).
2. The automatic printhead position adjustment device according to claim 1, characterized in that: The base plate (1) has mounting blocks (4) at both ends of one diagonal and bosses (14) at both ends of the other diagonal. The servo motor (3) is mounted above the mounting blocks (4) and the bosses (14).
3. The automatic printhead position adjustment device according to claim 2, characterized in that: A pressure plate (12) is provided at both ends of a diagonal of the base plate (1). The mounting block (4) is installed on the pressure plate (12). The limiting pin (8) is installed on the side of the pressure plate (12) facing the print head (2), and the ball end abuts against the side of the left adjustment plate (5) and the right adjustment plate (6) respectively.
4. The automatic printhead position adjustment device according to claim 2, characterized in that: The mounting block (4) is provided with a plunger mounting hole (41), and a positioning plunger (7) is installed in the plunger mounting hole (41). The ball head of the positioning plunger (7) faces downward and abuts against the printing nozzle (2).
5. The automatic printhead position adjustment device according to claim 2, characterized in that: The bottom plate (1) is provided with adjustment plate receiving grooves (13) at its left and right ends respectively. The adjustment plate receiving grooves (13) are used to receive the left adjustment plate (5) and the right adjustment plate (6). The adjustment plate receiving grooves (13) are provided with positioning holes (15).
6. The automatic printhead position adjustment device according to claim 5, characterized in that: The eccentric shaft (9) includes an eccentric section (91) and a positioning section (92) located below the eccentric section (91). After the two servos (3) are installed on the base plate (1), the eccentric section (91) is placed in the left elongated hole (51) and the right elongated hole (61) respectively, and the positioning section (92) is placed in the positioning hole (15).