An ink machine taper spindle and piston mounting connection structure

Abstract

The utility model discloses a kind of ink machine conical main shaft and piston installation connecting structure, it is characterized in that, it includes main shaft and guide pillar type conical piston, main shaft is provided with at least two screw holes and at least two guide pillars, piston is provided with the piston hole corresponding with guide pillar, piston keeps parallel with main shaft axis when moving in axial direction;Piston is provided with the corresponding connecting hole corresponding with screw hole, fastener is provided in connecting hole and is threadedly connected with screw hole, while providing necessary fixed, also allow piston to be guided under guide pillar and carry out axial adjustment.The utility model has good stability, can greatly improve the accuracy and stability of adjustment while keeping the flexibility of adjustment.

Description

Technical Field

[0001] This utility model relates to the field of color printing machine technology, and more specifically to an inkjet printer conical spindle and piston mounting and connection structure. Background Technology

[0002] In the industrial production process of aluminum two-piece cans, the color printing machine plays a crucial role in printing the can body pattern. The inkjet printer's conical spindle, as the core component for power transmission, receives rotational power from the large gear of the color printing machine and transmits it to other parts of the inkjet printer. It also serves as the mounting carrier for the conical sleeve, printing drum, and backlash-eliminating gear. The piston, a cylindrical component mounted to the inkjet printer spindle via shoulder screws, allows the conical sleeve to move axially by adjusting the feed screws, thereby adjusting the vertical position of the printing ink to meet the registration accuracy requirements of different printed patterns. In existing technology, the piston is connected to the spindle via four shoulder screws. To meet printing quality requirements, the piston needs to be pulled out significantly, resulting in a smaller contact area between the piston and the spindle head. When the feed screws are tightened, the small contact area makes the piston prone to wobble and deformation. This wobble and deformation cause slight deformation of the spindle head, leading to increased runout and ultimately affecting the accuracy of printing registration and reducing printing quality. Further structural improvements are necessary. Summary of the Invention

[0003] The purpose of this invention is to provide a stable and reliable inkjet printer conical spindle and piston mounting and connection structure that effectively improves the accuracy and stability of piston axial movement, avoids printing registration errors caused by sway deformation, and thus improves printing quality, in order to overcome the shortcomings of existing technologies.

[0004] This utility model achieves the above-mentioned objective by adopting the following technical solution: a tapered spindle and piston mounting and connection structure for an inkjet printer, characterized in that it includes a spindle and a guide-post type tapered piston. The spindle is provided with at least two screw holes and at least two guide posts. The piston is provided with piston holes corresponding to the guide posts. The piston remains parallel to the spindle axis when moving axially. The piston is provided with connecting holes corresponding to the screw holes. Fasteners are provided in the connecting holes and threadedly connected to the screw holes. While providing necessary fixation, it also allows the piston to be axially adjusted under the guidance of the guide posts.

[0005] As a further explanation of the above scheme, the guide post and the piston bore adopt a hole-based transition fit, which ensures the accuracy and stability of piston movement. This tight fit greatly reduces the possible displacement or deformation of the piston.

[0006] Preferably, the guide post and the piston bore have a fit tolerance of 0.01-0.02 mm.

[0007] Furthermore, at least two guide pillars are symmetrically arranged with the main shaft centerline as the axis of symmetry. The at least two symmetrical guide pillars provide precise guidance, which effectively prevents piston wobble.

[0008] Furthermore, at least two screw holes are symmetrically arranged with the spindle centerline as the axis of symmetry, and the spindle and piston are connected and fixed using shoulder screws.

[0009] Furthermore, the screw holes and guide posts are spaced apart, and the screw end of the shoulder screw is threaded to the screw hole of the spindle. The shoulder end abuts against the piston end face to achieve a fixed connection between the spindle and the piston. This connection method provides the necessary axial fixing force while allowing the piston to make precise axial adjustments under the guidance of the guide post.

[0010] The beneficial effects that this utility model can achieve by adopting the above-mentioned technical solution are:

[0011] This invention employs a design with at least two screw holes and at least two guide pillars on the main shaft, and a piston with a corresponding piston hole on the guide pillar. The piston remains parallel to the main shaft axis during axial movement. A connecting hole corresponding to the screw hole is also provided on the piston, with a fastener threaded into the connecting hole. Through the precise fit between the guide pillar and the piston hole, the axial movement of the piston is converted into linear sliding along the guide pillar, fundamentally solving the wobble problem caused by relying solely on screw connections in existing technologies. This ensures that the parallelism error between the piston's movement trajectory and the main shaft axis is ≤0.03mm. The guide pillar structure increases the contact area between the piston and the main shaft, providing continuous radial support even when the piston is pulled out a large distance, preventing deformation due to insufficient contact area and improving the rigidity and reliability of the connection structure. By reducing piston wobble and main shaft runout, the printing registration accuracy can be improved from ±0.15mm in existing technologies to within ±0.05mm, significantly improving the printing quality of aluminum two-piece cans. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model.

[0013] Figure 2 This is a schematic diagram of a guide post type conical piston structure.

[0014] Figure 3 for Figure 2 Side view.

[0015] Figure 4 This is a schematic diagram of the main shaft structure.

[0016] Figure 5 This is a schematic diagram of the main shaft structure.

[0017] Explanation of reference numerals in the attached diagram: 1. Spindle; 2. Guide post type conical piston; 3. Conical sleeve; 4. Screw hole; 5. Guide post; 6. Shoulder screw. Detailed Implementation

[0018] In the description of this utility model, it should be noted that the directional terms such as "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this utility model.

[0019] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Thus, the use of "first" and "second" to define a feature may explicitly or implicitly include one or more of that feature, and in this description of the utility model, "at least" means one or more, unless otherwise explicitly specified.

[0020] In this utility model, unless otherwise explicitly specified and limited, the terms "assembly," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can also refer to a mechanical connection; they can refer to a direct connection or a connection through an intermediate medium; or they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0021] In this utility model, unless otherwise specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "below," and "over" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Above," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0022] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings, making the technical solution and beneficial effects of this utility model clearer and more explicit. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0023] like Figures 1-5 As shown, this utility model is a conical spindle and piston mounting and connection structure for an inkjet printer, including a spindle 1 and a guide-post type conical piston 2. A conical sleeve 3 is installed at the end of the spindle 1. The spindle 1 has two screw holes 4 and two guide posts 5. The guide-post type conical piston 2 is provided with piston holes corresponding to the guide posts 5, and the piston remains parallel to the spindle axis when moving axially. The guide-post type conical piston is provided with connecting holes corresponding to the screw holes, and fasteners are provided in the connecting holes to connect with the screw holes threadedly, providing necessary fixation while also allowing the piston to be axially adjusted under the guidance of the guide posts. A fit tolerance of 0.01-0.02mm is used between the guide posts and the piston holes to ensure the accuracy and stability of piston movement; this tight fit greatly reduces the possible displacement or deformation of the piston. The two screw holes are connected by shoulder screws 6, a design that provides necessary fixation while also allowing the piston to be axially adjusted under the guidance of the guide posts.

[0024] The two guide pillars are symmetrically arranged with the spindle centerline as the axis of symmetry. These symmetrical pillars provide precise guidance, effectively preventing piston wobble. Two screw holes are also symmetrically arranged with the spindle centerline as the axis of symmetry, using shoulder screws to connect and secure the spindle to the piston. The screw holes are spaced apart from the guide pillars. The threaded end of the shoulder screw connects to the screw hole on the spindle, with the shoulder end abutting against the piston end face, thus achieving a fixed connection between the spindle and piston. This connection method provides the necessary axial fixing force while allowing the piston to make precise axial adjustments under the guidance of the guide pillars. In practical applications, the adjustment of the screw is performed as follows: Assuming the ink needs to be moved upwards by 0.1mm, the operator can rotate the adjusting screw clockwise. Each rotation may move the piston by 0.5mm (depending on the thread pitch). Therefore, the operator needs to precisely rotate the screw one-fifth of a turn. Through this fine adjustment, the ink position can be finely adjusted, ensuring accurate registration between different colors. This adjustment mechanism, combined with the improved guide post design, can greatly improve the accuracy and stability of the adjustment while maintaining its flexibility.

[0025] After modification, the installation steps are as follows: 1. Align the modified spindle with the piston, inserting the guide post into the corresponding precision hole on the piston. 2. Connect and fix the piston to the spindle using shoulder screws through the remaining two screw holes. 3. Adjust the infeed screws; the piston can move smoothly axially under the guidance of the guide post, achieving precise adjustment of the printing position. This modified structure ensures that the piston remains parallel to the spindle axis during adjustment, effectively avoiding wobble and deformation. Therefore, even when the piston needs to be pulled out significantly, stability is maintained, reducing the impact on the spindle head, decreasing spindle head runout, and thus improving the accuracy of printing registration and overall printing quality.

[0026] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present utility model, and these all fall within the protection scope of the present utility model.

Claims

1. A conical spindle and piston mounting and connection structure for an inkjet printer, characterized in that, It includes a spindle and a guide-post type conical piston. The spindle is provided with at least two screw holes and at least two guide posts. The piston is provided with piston holes corresponding to the guide posts. The piston remains parallel to the spindle axis when moving axially. The piston is provided with corresponding connecting holes corresponding to the screw holes. Fasteners are provided in the connecting holes and threadedly connected to the screw holes.

2. The inkjet printer conical spindle and piston mounting connection structure according to claim 1, characterized in that, The guide post and piston bore adopt a hole-based transition fit.

3. The inkjet printer tapered spindle and piston mounting connection structure according to claim 1, characterized in that, The guide post and piston bore have a fit tolerance of 0.01-0.02mm.

4. The inkjet printer conical spindle and piston mounting connection structure according to claim 1, characterized in that, At least two guide posts are symmetrically arranged with the main axis centerline as the axis of symmetry.

5. The inkjet printer conical spindle and piston mounting connection structure according to claim 1, characterized in that, At least two screw holes are symmetrically arranged with the spindle centerline as the axis of symmetry, and the spindle and piston are connected and fixed by shoulder screws.

6. The inkjet printer tapered spindle and piston mounting connection structure according to claim 5, characterized in that, The screw holes and guide posts are spaced apart. The screw end of the shoulder screw is threaded to the screw hole of the spindle, and the shoulder end abuts against the piston end face to achieve a fixed connection between the spindle and the piston.

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