Film digital direct-injection printing feeding mechanism capable of adjusting winding tightness

Abstract

The invention relates to the technical field of digital jet printing, in particular to a film digital direct-jet printing feeding mechanism capable of adjusting winding tightness, which comprises a rack and a case on the outer side of the rack, a discharging inflatable shaft assembly is arranged on the inner side of the rack, a printing trolley is arranged in the case, a printing platform is arranged at the bottom of the printing trolley, and the printing platform is arranged on the outer side of the rack. Movable drying assemblies are arranged on the two sides of the printing platform, and swing rod assemblies are arranged at the bottoms of the movable drying assemblies. Accurate detection of the mass of the gravity rods with different gravities is achieved through the gravity rod balance weight detection mechanism and the gravity balance mechanism, the winding tension is adaptively adjusted according to the detection result, a fixed tension structure or a complex electric control adjusting system in the prior art is replaced, tedious electric control programming or mechanical transformation is not needed in the design, and the production cost is reduced. And thin films of different types and thicknesses can be quickly adapted only by replacing gravity rods of different weights, and the requirements of different printing processes for winding tension can be met.

Description

Technical Field

[0001] This invention relates to the field of digital inkjet printing technology, and in particular to a film digital direct inkjet printing feed mechanism with adjustable winding tension. Background Technology

[0002] With the rapid development of digital printing technology, film materials, due to their lightweight, flexibility, and strong weather resistance, are widely used in packaging, advertising, electronic devices, and other fields. However, existing film digital direct-to-garment printing feeding mechanisms are prone to inaccurate stepping issues in practical applications. Film materials are thin, flexible, and easily affected by the gravity of the printing swing arm during transport. As a key component of the feeding mechanism, the printing swing arm's own weight directly acts on the film surface, causing uneven stress on the film. This leads to slippage and displacement deviations during stepping transport, resulting in decreased accuracy of the printed pattern and defects such as ghosting and misalignment. This problem is particularly pronounced in high-precision printing scenarios. Furthermore, adjusting the take-up tension is difficult. Different types and thicknesses of film have different requirements for take-up tension, and the same film requires different take-up tensions under different printing processes. Currently, most feeding mechanisms on the market use fixed-tension take-up structures or adjust tension through complex electronic control systems. These adjustment methods are cumbersome, costly, and difficult to achieve precise and stable tension control, failing to meet diverse production needs.

[0003] To address the problems of inaccurate stepping and poor adjustability of winding tension in existing film digital direct-to-garment printing feed mechanisms, there is an urgent need to develop a feed mechanism that is simple in structure, easy to adjust, and highly stable, in order to improve the accuracy of film printing and product quality. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a film digital direct-to-garment printing feed mechanism with adjustable winding tension, which solves the technical problems of inaccurate stepping and poor adjustability of winding tension in film digital direct-to-garment printing feed mechanisms.

[0005] To solve the above technical problems, the present invention provides the following technical solution: a film digital direct-to-garment printing feeding mechanism with adjustable winding tension, including a frame and a housing outside the outer frame. The inner side of the frame is provided with a feeding air shaft assembly. The inside of the housing is provided with a printing carriage. The bottom of the printing carriage is provided with a printing platform. The two sides of the printing platform are provided with movable drying components. The bottom of the movable drying components is provided with a swing arm assembly. The bottom of the housing is provided with a bottom drying assembly. The lower part of the printing platform is provided with a lifting corner wrapping roller assembly. The upper part of the lifting corner wrapping roller assembly is provided with a stepping active roller assembly. The stepping active roller assembly is located between the lifting corner wrapping roller assembly and the printing platform. A feeding signal gravity rod assembly is provided at the connection between the frame and the chassis. A cloth-rubbing control assembly is provided on the inner side of the frame near the inner side of the chassis. A receiving and wrinkle-removing motor is provided next to the cloth-rubbing control assembly. A cooling air assembly is provided on the outer bottom of the frame. A receiving air shaft assembly is provided on the top of the cooling air assembly. A gravity rod counterweight detection mechanism is provided inside the cloth-rubbing control assembly. A cloth-rubbing roller is provided at the bottom of the inner wall of the longitudinal guide rail near the frame. A rubber pressure roller is provided on the top of the cloth-rubbing roller. A lifting cylinder for controlling the lifting and lowering of the rubber pressure roller is provided on the top of the rubber pressure roller.

[0006] The inside of the material receiving and wrinkle removal motor is equipped with a material receiving and wrinkle removal component. At the end of the material receiving and wrinkle removal component is a rubber strip roller expansion roller. A winding rod is provided on the side of the rubber strip roller expansion roller near the cold air component. An infrared distance sensor is provided on the top of the longitudinal guide rail.

[0007] Preferably, the fabric-rubbing control assembly includes a longitudinal guide rail fixedly connected to the inner wall of the frame, an electromagnet fixedly installed on the inner top of the longitudinal guide rail, a spring fixedly connected to the bottom of the electromagnet, and a longitudinal slider fixedly installed on the other end of the spring. The longitudinal slider is slidably installed on the longitudinal guide rail in the vertical direction.

[0008] Preferably, the gravity bar counterweight detection mechanism includes a fixed sleeve disposed inside the longitudinal slider, an installation block slidably mounted inside the fixed sleeve, an elastic air bladder at the bottom of the installation block, conductive contact pieces on both sides of the installation block, conductive rods symmetrically arranged longitudinally on the outer side of the elastic air bladder, and conductive wires fixedly connected to the top of each conductive rod.

[0009] Preferably, both the conductive contact and the conductive rod are electrically connected to the electromagnet.

[0010] By employing the above technical solution, the present invention provides a film digital direct-to-garment printing feed mechanism with adjustable winding tension, which has at least the following beneficial effects: 1. This invention effectively overcomes the direct effect of the printing arm's gravity on the film by setting up a fabric-feeding structure. The fabric-feeding structure can provide stable support and force balance for the printing arm, avoiding uneven local stress on the film caused by the arm's gravity, reducing slippage and displacement deviation of the film during the stepping conveyor process, significantly improving the registration accuracy of the printed pattern, and eliminating defects such as ghosting and misalignment. It is especially suitable for high-precision film printing scenarios, ensuring the stability of printing quality.

[0011] 2. This invention achieves accurate detection of the mass of gravity bars under different weights through a gravity bar counterweight detection mechanism and a gravity balance mechanism, and adaptively adjusts the winding tension based on the detection results. This replaces the fixed tension structure or complex electronic control adjustment system in the prior art. This design does not require cumbersome electronic control programming or mechanical modification. It can quickly adapt to different types and thicknesses of films and the winding tension requirements of different printing processes simply by changing gravity bars of different weights. The adjustment operation is simple and convenient, and the tension control is accurate and stable, reducing equipment costs and operating thresholds, and meeting diverse production needs. Attached Figure Description

[0012] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the internal structure of the chassis of the present invention; Figure 3 This is a side view of the structure of the present invention; Figure 4 This is a schematic diagram of the printing medium rewinding state structure of the present invention; Figure 5 This is a three-dimensional structural diagram of the fabric feeding control component of the present invention; Figure 6 This is a schematic diagram of the internal structure of the fabric feeding control component of the present invention; Figure 7 For the present invention Figure 6 Enlarged schematic diagram of the structure at point A in the middle.

[0013] In the diagram: 1. Frame; 2. Feeding air shaft assembly; 3. Printing carriage; 4. Printing platform; 5. Movable drying assembly; 6. Swing arm assembly; 7. Bottom drying assembly; 8. Lifting corner rubber roller assembly; 9. Stepping active rubber roller assembly; 10. Feeding signal gravity rod assembly; 11. Machine housing; 12. Fabric feeding control assembly; 120. Longitudinal guide rail; 121. Electromagnet; 122. Spring; 123. Longitudinal slider; 13. Receiving element. 14. Wrinkle-removing motor; 15. Cooling air assembly; 16. Take-up air shaft assembly; 17. Fabric rubbing roller; 18. Rubber pressure roller; 19. Lifting cylinder; 20. Infrared ranging sensor; 20. Gravity bar counterweight detection mechanism; 200. Fixing sleeve; 201. Mounting block; 202. Elastic airbag; 203. Conductive contact piece; 204. Conductive rod; 205. Conductive wire; 21. Take-up wrinkle-removing assembly; 22. Rubber strip roller expansion roller; 23. Take-up rod. Detailed Implementation

[0014] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0015] Example 1 Please refer to Figure 1 - Figure 5 An adjustable winding tension film digital direct-to-garment printing feeding mechanism includes a frame 1 and a housing 11 on the outer side of the frame 1. A feeding air shaft assembly 2 is provided on the inner side of the frame 1. A printing carriage 3 is located inside the housing 11. A printing platform 4 is located at the bottom of the printing carriage 3. Movable drying components 5 are located on both sides of the printing platform 4. A swing arm assembly 6 is located at the bottom of the movable drying components 5. A bottom drying assembly 7 is located at the bottom of the housing 11. The printing carriage 3 moves along a preset trajectory to perform digital direct-to-garment printing on the film on the printing platform 4. The movable drying components 5 on both sides of the printing platform 4 and the bottom drying assembly 7 at the bottom of the housing 11 work together to quickly and evenly dry the printed film, preventing ink smudging and improving printing quality. Below the printing platform 4 is a lifting corner-wrapping roller assembly 8, and above the lifting corner-wrapping roller assembly 8 is a stepping active roller assembly 9. The stepping active roller assembly 9 is located between the lifting corner-wrapping roller assembly 8 and the printing platform 4. The lifting corner-wrapping roller assembly 8 is controlled by a cylinder to move up and down. When feeding material, the cylinder retracts to leave sufficient space for feeding; when printing, the cylinder extends, so that the film forms a stable wrapping angle on the stepping active roller assembly 9. The stepping active roller assembly 9 is driven by a high-precision servo motor and reducer, combined with PLC control, to achieve precise stepping delivery of the film, ensuring high-quality printing. A feeding signal gravity rod assembly 10 is provided at the connection between the frame 1 and the chassis 11. The feeding motor operates upon receiving instructions from the PLC. A photoelectric switch senses the position of the feeding signal gravity rod assembly 10 in real time and feeds it back to the PLC. The PLC then controls the start and stop of the servo feeding motor to achieve precise matching between the feeding speed and subsequent processes, ensuring feeding stability. A fabric crimping control assembly 12 is provided on the inner side of the frame 1, near the inner side of the chassis 11. A take-up and wrinkle-removing motor 13 is provided next to the fabric crimping control assembly 12. A cooling air assembly 14 is provided on the outer bottom of the frame 1. The top of the machine is equipped with a receiving air shaft assembly 15. The inside of the fabric feeding control assembly 12 is equipped with a gravity bar counterweight detection mechanism 20. A fabric feeding roller 16 is located at the bottom of the inner wall of the longitudinal guide rail 120 near the frame 1. A rubber pressure roller 17 is located on top of the fabric feeding roller 16, and a lifting cylinder 18 is located on top of the rubber pressure roller 17 to control its lifting and lowering. The fabric feeding control assembly 12 is located beside the connection between the frame 1 and the housing 11. The fabric feeding roller 16 is installed at the bottom of the inner wall of the longitudinal guide rail 120, and its top rubber pressure roller 17 is controlled to move up and down by the lifting cylinder 18, facilitating the material feeding operation. The fabric feeding roller 16 is driven by a servo motor controlled by a PLC, which not only matches the printing speed but also effectively overcomes the gravity of the swing arm assembly 6, avoiding uneven local stress on the film caused by the swing arm's gravity. The internal gravity bar counterweight detection mechanism 20 can monitor the tension status in real time, further ensuring the tension balance of the film transport.

[0016] The take-up wrinkle removal motor 13 has a take-up wrinkle removal component 21 inside. The end of the take-up wrinkle removal component 21 is equipped with a rubber strip roller expansion roller 22. The side of the rubber strip roller expansion roller 22 near the cooling air component 14 is equipped with a winding rod 23. The servo take-up motor receives PLC commands to operate. The photoelectric switch and the infrared distance sensor 19 work together to sense the position of the take-up signal gravity rod. After feedback to the PLC, the servo take-up motor is controlled to start and stop, realizing the adjustment of the take-up speed. By replacing the take-up signal gravity rod with different weights, different winding tightness requirements can be accurately adapted to meet the diverse requirements of subsequent processes. During the take-up process, the take-up wrinkle removal motor 13 drives the take-up wrinkle removal component 21 to operate, which works with the rubber strip roller expansion roller 22 to eliminate film wrinkles. The cooling air component 14 cools and shapes the film before winding. Finally, the winding rod 23 completes the uniform winding.

[0017] Example 2 Please refer to Figure 6 - Figure 7 This embodiment is basically the same as Embodiment 1. This embodiment is made on the basis of Embodiment 1 and has the same beneficial effects as Embodiment 1. The same parts can be referred to each other, and will not be described in detail here.

[0018] The fabric-rubbing control assembly 12 includes a longitudinal guide rail 120 fixedly connected to the inner wall of the frame 1. An electromagnet 121 is fixedly installed on the top inner side of the longitudinal guide rail 120, and a spring 122 is fixedly connected to the bottom of the electromagnet 121. A longitudinal slider 123 is fixedly installed on the other end of the spring 122. The longitudinal slider 123 is slidably installed on the longitudinal guide rail 120 in the vertical direction. The gravity bar counterweight detection mechanism 20 includes a fixing sleeve 200 disposed inside the longitudinal slider 123. An mounting block 201 is slidably installed inside the fixing sleeve 200. An elastic airbag 202 is provided at the bottom of the mounting block 201. Conductive contacts 203 are provided on both sides of the mounting block 201. Conductive rods 204 are symmetrically arranged longitudinally on the outer side of the elastic airbag 202. The top of each of the four components is fixedly connected with a conductive wire 205. To ensure that the winding tension can be adjusted adaptively when using gravity rods with different weights, after the gravity rod is replaced, the gravity rod with a greater weight causes the mounting block 201 to move down a greater distance. At this time, the elastic airbag 202 is compressed a greater distance. At this time, the contact position of the conductive contact 203 and the conductive rod 204 is closer to the side of the elastic airbag 202. At this time, the greater the current in the circuit formed by the conductive contact 203, the conductive rod 204 and the conductive wire 205, the greater the current flowing through the control electromagnet 121, and the greater the electromagnetic attraction force corresponding to the gravity rod with a greater weight. This maintains the balance between the electromagnetic attraction force and the weight of the gravity rod, thereby achieving adaptive adjustment of the winding tension of different gravity rods. As a preferred technical solution in this embodiment, both the conductive contact 203 and the conductive rod 204 are electrically connected to the electromagnet 121. After the conductive contact 203 and the conductive rod 204 are in contact and energized, the electromagnetic attraction force of the electromagnet 121 is generated synchronously. An infrared ranging sensor 19 is provided on the top of the longitudinal guide rail 120. The infrared ranging sensor 19 is used for real-time monitoring of the running status of the internal gravity rod.

[0019] The control method of this invention is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the art. Furthermore, since this invention is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail here.

[0020] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0021] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. Since the above embodiments are substantially similar to the method embodiments, their descriptions are relatively simple; relevant parts can be referred to the descriptions of the method embodiments.

[0022] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A film digital direct-to-garment printing feed mechanism with adjustable winding tension, comprising a frame (1) and a housing (11) outside the outer frame (1), wherein the inner side of the frame (1) is provided with a feeding air shaft assembly (2), the inside of the housing (11) is provided with a printing carriage (3), the bottom of the printing carriage (3) is provided with a printing platform (4), the two sides of the printing platform (4) are provided with movable drying components (5), the bottom of the movable drying components (5) is provided with a swing arm assembly (6), and the bottom of the housing (11) is provided with a bottom drying component (7), characterized in that: The lower side of the printing platform (4) is provided with a lifting angle rubber roller assembly (8), the upper side of the lifting angle rubber roller assembly (8) is provided with a stepping active rubber roller assembly (9), and the stepping active rubber roller assembly (9) is located between the lifting angle rubber roller assembly (8) and the printing platform (4); The connecting part of the rack (1) and the cabinet (11) is provided with a feeding signal gravity rod assembly (10), the inner side of the rack (1) close to the inner side of the cabinet (11) is provided with a cloth rubbing control assembly (12), the side of the cloth rubbing control assembly (12) is provided with a receiving material wrinkle removing motor (13), the outer side of the bottom of the rack (1) is provided with a cold air assembly (14), the top of the cold air assembly (14) is provided with a receiving material air inflation shaft assembly (15), and the inside of the cloth rubbing control assembly (12) is provided with a gravity rod counterweight detection mechanism (20).

2. The film digital direct inkjet printing and walking mechanism with adjustable take-up tightness according to claim 1, characterized in that: The cloth rubbing control assembly (12) comprises a longitudinal guide rail (120) fixedly connected to the inner wall of the rack (1), an electromagnet (121) fixedly installed at the inner top of the longitudinal guide rail (120), a spring (122) fixedly connected to the bottom of the electromagnet (121), and a longitudinal sliding block (123) fixedly installed at the other end of the spring (122) and vertically slidingly installed on the longitudinal guide rail (120).

3. The film digital direct inkjet printing and unwinding mechanism with adjustable tension according to claim 2, characterized in that: The gravity rod counterweight detection mechanism (20) comprises a fixed sleeve (200) arranged in the longitudinal sliding block (123), an installation block (201) slidingly installed in the fixed sleeve (200), an elastic air bag (202) arranged at the bottom of the installation block (201), conductive tabs (203) arranged at the two sides of the installation block (201), conductive rods (204) symmetrically arranged at the outer side of the elastic air bag (202) in the longitudinal direction, and conductive wires (205) fixedly connected to the top of the conductive rods (204).

4. The film digital direct inkjet printing and unwinding mechanism with adjustable tension according to claim 3, characterized in that: The conductive tabs (203) and the conductive rods (204) are electrically connected to the electromagnet (121).

5. The adjustable take-up tension film digital direct inkjet printing media advance mechanism of claim 2, wherein: The inner wall bottom of the rack (1) close to the longitudinal guide rail (120) is provided with a cloth rubbing roller (16), the top of the cloth rubbing roller (16) is provided with a rubber pressure roller (17), and the top of the rubber pressure roller (17) is provided with a lifting cylinder (18) for controlling the lifting of the rubber pressure roller (17).

6. The film digital direct inkjet printing and unwinding mechanism with adjustable tension according to claim 1, characterized in that: The inside of the receiving material wrinkle removing motor (13) is provided with a receiving material wrinkle removing assembly (21), the end of the receiving material wrinkle removing assembly (21) is provided with a rubber strip roller expansion roller (22), and the side of the rubber strip roller expansion roller (22) close to the cold air assembly (14) is provided with a winding rod (23).

7. The adjustable take-up tension film digital direct inkjet printing media advance mechanism of claim 2, wherein: The top of the longitudinal guide rail (120) is provided with an infrared distance sensor (19).

8. The adjustable take-up tension film digital direct inkjet printing media advance mechanism of claim 3, wherein: A plurality of clamping blocks for mounting the gravity rod are arranged on the installation block (201), and the gravity rod can be quickly disassembled through the plurality of clamping blocks during installation.

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