An automatic feeding device for printing on rice paper

Abstract

The utility model discloses an automatic feeding device for rice paper printing belongs to printing machinery technical field. The utility model adopts technical scheme for, an automatic feeding device for rice paper printing, including the short stroke vertical lifting mechanism of setting in the front end of printing machine printing subassembly, the drive end fixed connection negative pressure sucking disc of lifting mechanism, a plurality of first adsorption channels are equipped with in the negative pressure sucking disc bottom, the bottom sliding connection of negative pressure sucking disc has the adjusting plate, be equipped with a plurality of second adsorption channels with first adsorption channel number, position all mutually matched on the adjusting plate, the lateral wall of negative pressure sucking disc is equipped with the drive portion for driving the sliding of adjusting plate, the utility model discloses change adsorption channel coincident area through the sliding adjusting plate, and the feedback of pressure sensor is combined and realizes suction power dynamic regulation, has solved the problem that traditional equipment leads to the breakage or adhesion of rice paper because of suction power fixed, has the advantage that accurately control adsorption, protect the integrity of rice paper.

Description

Technical Field

[0001] This utility model belongs to the field of printing machinery technology, specifically relating to an automatic feeding device for Xuan paper printing. Background Technology

[0002] Xuan paper, as an outstanding representative of traditional Chinese handmade paper, is widely used in the printing of calligraphy, paintings, and cultural classics due to its fine fibers, light and thin texture, and excellent ink absorption. However, the physical properties of Xuan paper also bring unique challenges to automated printing production: its paper strength is relatively low, its tear resistance is poor, and the thickness of a single sheet is usually only 0.05-0.1mm, making it prone to wrinkles, damage, or multiple sheets sticking together during automated feeding.

[0003] Currently, the feeding process in the Xuan paper printing industry largely relies on manual operation. Workers must manually separate individual sheets of Xuan paper and feed them one by one into the printing components of the printing press. This method is not only labor-intensive and inefficient, but also makes it difficult to ensure the consistency of the feeding position, directly affecting printing accuracy. At the same time, hand oils and sweat during manual handling can easily contaminate the surface of the Xuan paper, reducing the quality of the finished product.

[0004] To address these issues, some companies have attempted to use automated feeding equipment for ordinary paper to feed Xuan paper, but the results have been unsatisfactory. Friction-type paper separators separate individual sheets of paper through friction between the friction wheel and the paper surface, but Xuan paper fibers are fragile and easily become fuzzy or damaged due to friction. Traditional vacuum suction cup feeders have fixed suction channel sizes, making it impossible to adjust the suction force according to the thickness and material of the Xuan paper. If the suction force is too weak, it is difficult to stably absorb individual sheets of Xuan paper, while if the suction force is too strong, the Xuan paper fibers will be sucked into the channels, causing paper damage or leaving suction marks, which seriously affects the printing effect.

[0005] It is particularly noteworthy that existing automatic feeding devices generally suffer from the following technical defects: First, they cannot achieve precise adjustment of the adsorption force, resulting in poor adaptability to special materials such as Xuan paper; second, they lack intelligent control methods and cannot automatically adjust adsorption parameters according to actual working conditions; and third, their mechanical structure design is unreasonable, easily causing secondary damage to the Xuan paper during operation. These problems seriously restrict the promotion and application of automation in Xuan paper printing. Utility Model Content

[0006] This utility model provides an automatic feeding device for Xuan paper printing to solve at least one of the above-mentioned technical problems.

[0007] The technical solution adopted in this utility model is as follows: An automatic feeding device for Xuan paper printing includes a short-stroke vertical lifting mechanism disposed at the front end of the printing assembly of a printing machine. The driving end of the lifting mechanism is fixedly connected to a negative pressure suction cup. The bottom surface of the negative pressure suction cup is provided with a plurality of first adsorption channels. An adjusting plate is slidably connected to the bottom of the negative pressure suction cup. The adjusting plate is provided with a plurality of second adsorption channels that match the number and position of the first adsorption channels. The side wall of the negative pressure suction cup is provided with a driving part for driving the adjusting plate to slide. The adjusting plate slides to adjust the overlapping area of ​​the second adsorption channels and the first adsorption channels.

[0008] Furthermore, this application also proposes that a mesh plate is provided inside the second adsorption channel, and the end face of the mesh plate is flush with the bottom surface of the adjustment plate.

[0009] Furthermore, this application also proposes to include a negative pressure vacuum machine, wherein a gas guiding hose is connected between the negative pressure vacuum machine and the inner cavity of the negative pressure suction cup.

[0010] Furthermore, this application also proposes that the side wall of the negative pressure suction cup is provided with a sliding groove, and the side wall of the adjusting plate is provided with a guide flange that slides in cooperation with the sliding groove.

[0011] Furthermore, this application also proposes that the lifting mechanism includes vertical guide rails, two of which are symmetrically arranged, and mounting plates are slidably connected to the inner sides of the two vertical guide rails. The lower end of the mounting plate is fixedly connected to the negative pressure suction cup. A first telescopic cylinder is provided on the vertical guide rail. The first telescopic cylinder has a first telescopic end, and the lower end of the first telescopic end is fixedly connected to the upper end face of the negative pressure suction cup.

[0012] Furthermore, this application also proposes that the drive unit includes a second telescopic cylinder, the second telescopic cylinder having a second telescopic end, the second telescopic end being fixedly connected to the side wall of the adjustment plate.

[0013] Furthermore, this application also proposes a control mechanism, which includes an instruction input terminal, a pressure detection terminal, and a control adjustment terminal. The pressure detection terminal includes a pressure sensor, which is disposed on the bottom surface of the adjustment plate and located around the second adsorption channel. After the suction value is input through the instruction input terminal, the control adjustment terminal controls the second telescopic cylinder to adjust the telescopic amount of the second telescopic end, thereby adjusting the overlapping area of ​​the second adsorption channel and the first adsorption channel, so that the negative pressure suction value detected by the pressure detection terminal is the same as the input suction value.

[0014] Due to the adoption of the above technical solution, the beneficial effects achieved by this utility model are as follows: 1. This solution achieves dynamic adjustment of suction force by changing the overlapping area of ​​the adsorption channels using a sliding adjustment plate. Compared to friction-type paper separators, this solution uses a non-contact adsorption method, avoiding damage to the Xuan paper fibers caused by mechanical friction. Compared to vacuum suction cups with fixed channels, this solution solves the problem of mismatch between suction force and paper strength by adjusting the effective adsorption area. This application can adjust the adsorption force in real time according to the thickness and material of the Xuan paper, ensuring stable adsorption of single sheets of Xuan paper while avoiding excessive suction that could cause paper damage or adsorption marks. This device realizes automated control of the Xuan paper feeding process, improving feeding accuracy and printing quality, and solving the problems of low efficiency and easy paper contamination caused by traditional manual operation.

[0015] 2. The mesh plate disperses the adsorption force into multiple tiny points of action, reducing the force per unit area. Simultaneously, the mesh size restricts fiber entry into the channels. Furthermore, the flush design of the mesh plate and the bottom of the adjusting plate prevents localized bending of the paper due to structural height differences, solving the problem of Xuan paper fiber damage caused by concentrated suction in traditional adsorption channels, preventing adsorption residue, and ensuring stable adsorption of individual sheets of Xuan paper during the sliding of the adjusting plate through the even distribution of adsorption force. This prevents multiple sheets from sticking together or accidentally falling off, improving the yield rate of high-quality Xuan paper.

[0016] 3. By automatically sliding the adjusting plate through the second telescopic cylinder, the device can quickly respond to changes in adsorption force during operation, avoiding adjustment delays or errors caused by manual intervention. This also reduces paper damage or adsorption failure caused by unstable adsorption force. This application achieves precise control of the adsorption force on Xuan paper, ensuring stable adsorption of individual sheets while preventing fiber damage or adsorption marks. It effectively solves the problems of paper damage, adhesion, and reduced printing quality caused by the unadjustable adsorption force in traditional equipment.

[0017] 4. Through the synergistic effect of real-time monitoring by pressure sensors and automatic adjustment mechanisms, optimal adsorption force can be dynamically maintained during the feeding of Xuan paper of different thicknesses. This avoids paper slippage due to insufficient adsorption and prevents fiber damage or adsorption residue caused by excessive adsorption. This application achieves precise closed-loop control of the adsorption force of Xuan paper, solving the problem of paper damage or adsorption failure caused by the unadjustable adsorption force in traditional fixed-aperture adsorption devices. It ensures that ultra-thin Xuan paper maintains its integrity and accurate positioning during automated feeding, while adapting to the process requirements of Xuan paper of different weights. Attached Figure Description

[0018] Figure 1 This is one of the structural schematic diagrams of a specific embodiment of the present utility model; Figure 2 This is the second structural schematic diagram of a specific embodiment of the present utility model; Figure 3 This is a front view of a specific embodiment of the present utility model; Figure 4 This is a top view of a specific embodiment of the present utility model.

[0019] The accompanying drawings, which are provided to further illustrate the present invention and constitute a part of the present invention, illustrate exemplary embodiments of the present invention and are used to explain the present invention, but do not constitute an undue limitation of the present invention.

[0020] In the attached diagram: 1. Vertical guide rail; 11. Mounting plate; 12. First telescopic cylinder; 121. First telescopic end; 2. Negative pressure suction cup; 21. Slide groove; 22. First adsorption channel; 3. Adjusting plate; 31. Second adsorption channel; 311. Mesh plate; 4. Second telescopic cylinder; 5. Negative pressure vacuum machine; 51. Air guide hose. Detailed Implementation

[0021] To more clearly illustrate the overall concept of this utility model, a detailed description will be provided below with reference to the accompanying drawings.

[0022] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0023] Furthermore, it should be understood in the description of this utility model that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship 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. Therefore, they should not be construed as limitations on this utility model.

[0024] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between 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.

[0025] In this invention, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "implementation," "example," "aspect," or "specific example" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0026] Reference Figures 1 to 4 An automatic feeding device for Xuan paper printing includes a short-stroke vertical lifting mechanism located at the front end of the printing assembly of a printing machine. The driving end of the lifting mechanism is fixedly connected to a negative pressure suction cup 2. The bottom surface of the negative pressure suction cup 2 is provided with a plurality of first adsorption channels 22. An adjusting plate 3 is slidably connected to the bottom of the negative pressure suction cup 2. The adjusting plate 3 is provided with a plurality of second adsorption channels 31 that match the number and position of the first adsorption channels 22. The side wall of the negative pressure suction cup 2 is provided with a driving part for driving the adjusting plate 3 to slide. The adjusting plate 3 slides to adjust the overlapping area of ​​the second adsorption channels 31 and the first adsorption channels 22.

[0027] The short-stroke vertical lifting mechanism refers to a mechanical structure capable of small-range vertical lifting movements, specifically implemented using a cylinder or electric push rod, used to control the contact distance between the negative pressure suction cup 2 and the stack of Xuan paper. The negative pressure suction cup 2 is a component with an internal cavity that generates adsorption force through an external negative pressure source. Its bottom surface has multiple first adsorption channels 22 for contacting the Xuan paper surface to form negative pressure adsorption. The adjusting plate 3 is a plate-shaped component slidably connected to the bottom of the negative pressure suction cup 2. The second adsorption channels 31 on its surface correspond to the positions of the first adsorption channels 22. Lateral displacement changes the overlapping area of ​​the two channels, thereby adjusting the effective adsorption channel size. The driving unit is the power element that drives the adjusting plate 3 to slide, specifically implemented using a linear motor or cylinder, used to precisely control the displacement of the adjusting plate 3.

[0028] Specifically, when Xuan paper needs to be adsorbed, the short-stroke vertical lifting mechanism lowers the negative pressure suction cup 2 to contact the stack of Xuan paper. The negative pressure vacuum machine 5 provides negative pressure to the inner cavity of the negative pressure suction cup 2 through the air guide hose 51. At this time, the overlapping area of ​​the first adsorption channel 22 and the second adsorption channel 31 forms an effective adsorption channel. By controlling the sliding position of the adjustment plate 3 through the drive unit, the second adsorption channel 31 is laterally offset relative to the first adsorption channel 22, thereby changing the overlapping area of ​​the two. When it is necessary to increase the suction force, the drive adjustment plate 3 makes the second adsorption channel 31 completely overlap with the first adsorption channel 22, at which time the effective adsorption area is maximized; when it is necessary to decrease the suction force, the drive adjustment plate 3 makes the second adsorption channel 31 partially block the first adsorption channel 22, reducing the effective adsorption area. This adjustment process can be adjusted in real time according to the thickness and material of the Xuan paper to avoid excessive suction causing paper damage or insufficient suction causing adsorption failure.

[0029] Traditional vacuum suction cups have fixed adsorption channel sizes, making them unsuitable for the varying physical properties of different types of Xuan paper. This solution, however, uses a sliding adjustment plate 3 to change the overlapping area of ​​the adsorption channels, achieving dynamic adjustment of the suction force. Compared to friction-type paper separators, this solution employs a non-contact adsorption method, avoiding damage to the Xuan paper fibers from mechanical friction. Compared to vacuum suction cups with fixed channels, this solution solves the problem of mismatch between suction force and paper strength by adjusting the effective adsorption area.

[0030] Through the above technical solution, this application can adjust the adsorption force in real time according to the thickness and material of Xuan paper, ensuring stable adsorption of single sheets of Xuan paper while avoiding excessive suction that could damage the paper or leave adsorption marks. This device achieves automated control of the Xuan paper feeding process, improving feeding accuracy and printing quality, and solving the problems of low efficiency and easy paper contamination associated with traditional manual operations.

[0031] As a preferred example of the above implementation method, refer to Figure 2 A mesh plate 311 is installed inside the second adsorption channel 31, with its end face flush with the bottom surface of the adjusting plate 3. The mesh plate 311 is a porous structure covering the opening of the second adsorption channel 31, and can be made of stainless steel woven mesh or nylon filter mesh. By setting the mesh plate 311, the local intensity of the negative pressure adsorption force on the Xuan paper can be dispersed, preventing fibers from being sucked into the channel. The end face being flush with the bottom surface of the adjusting plate 3 means that the outer surface of the mesh plate 311 is on the same plane as the bottom of the adjusting plate 3, which can be achieved through embedded installation or surface welding. This structure ensures that the mesh plate 311 is in complete contact with the surface of the Xuan paper during adsorption, avoiding local pressure concentration caused by protrusions or depressions in the mesh plate 311.

[0032] During the sliding of the adjusting plate 3, the overlap area between the second adsorption channel 31 and the first adsorption channel 22 changes. At this time, the mesh plate 311 always covers the opening of the second adsorption channel 31. When the negative pressure suction cup 2 adsorbs Xuan paper, the negative pressure is transmitted to the surface of the mesh plate 311 through the first adsorption channel 22 and the second adsorption channel 31. The mesh plate 311 disperses the concentrated negative pressure adsorption force into multiple tiny points of action. Because the pore size of the mesh plate 311 is smaller than the length of the Xuan paper fibers, the fibers cannot penetrate the mesh to enter the adsorption channels. Simultaneously, the distribution of these tiny pores ensures that the adsorption force is evenly distributed on the surface of the Xuan paper. For example, when the adjusting plate 3 slides until the second adsorption channel 31 and the first adsorption channel 22 completely overlap, the coverage area of ​​the mesh plate 311 reaches its maximum, resulting in the largest adsorption area and a uniformly distributed adsorption force. When the adjusting plate 3 slides to partial overlap, the mesh plate 311 only covers the effective adsorption area, preventing negative pressure leakage from ineffective areas.

[0033] This solution disperses the adsorption force into multiple tiny points of action through the screen plate 311, reducing the force per unit area. Simultaneously, the mesh size restricts fiber entry into the channels. Furthermore, the flush design between the screen plate 311 and the bottom surface of the adjusting plate 3 prevents localized bending of the paper due to structural height differences, solves the problem of Xuan paper fiber damage caused by concentrated suction in traditional adsorption channels, prevents adsorption residue, and ensures stable adsorption of individual sheets of Xuan paper during the sliding of the adjusting plate 3 by the evenly distributed adsorption force of the screen plate 311. This prevents multiple sheets from sticking together or accidentally falling off, improving the yield rate of finished products.

[0034] Additionally, a negative pressure vacuum pump 5 is included, with a flexible air guide hose 51 connecting the negative pressure vacuum pump 5 to the inner cavity of the negative pressure suction cup 2. The negative pressure vacuum pump 5 is a device that mechanically creates a negative pressure environment within a closed space; specifically, it can be implemented using a rotary vane vacuum pump or a vortex vacuum pump, providing a controllable negative pressure source for the adsorption process. The flexible air guide hose 51 is a flexible and airtight tubular connector, specifically made of corrugated rubber or silicone material, ensuring airflow continuity during the lifting and lowering of the negative pressure suction cup 2.

[0035] The negative pressure vacuum machine 5 forms a closed airway system with the inner cavity of the negative pressure suction cup 2 through the air guide hose 51. When the negative pressure suction cup 2 contacts the surface of the Xuan paper, the negative pressure vacuum machine 5 starts and creates a negative pressure environment in the inner cavity of the suction cup, generating an adsorption force on the Xuan paper through the overlapping area of ​​the first adsorption channel 22 and the second adsorption channel 31. The flexible nature of the air guide hose 51 allows the airway connection to be unaffected by rigid constraints when the negative pressure suction cup 2 moves vertically under the drive of the lifting mechanism. The independent setting of the negative pressure vacuum machine 5 allows it to dynamically adjust the negative pressure intensity according to the thickness of the Xuan paper, for example, reducing the vacuum degree when adsorbing ultra-thin Xuan paper to avoid fiber damage.

[0036] This solution uses an independently set negative pressure vacuum machine 5 in conjunction with a gas guide hose 51 to achieve precise control of negative pressure intensity and avoid the impact of equipment vibration on the stability of the gas path. It can adjust the adsorption force in real time according to the thickness and fiber strength of the Xuan paper, ensuring that a single sheet of Xuan paper is stably adsorbed while preventing fibers from being sucked into the adsorption channel or causing indentations due to excessive negative pressure. This effectively solves the problem of paper damage caused by traditional fixed negative pressure systems.

[0037] As another preferred example of the above-described implementation method, refer to Figures 1-3 The negative pressure suction cup 2 has a groove 21 on its side wall, and the adjusting plate 3 has a guide flange on its side wall that slides in conjunction with the groove 21. The engagement of the groove 21 and the guide flange ensures that the adjusting plate 3 is always limited by the side wall of the groove 21 when sliding horizontally at the bottom of the negative pressure suction cup 2, thus ensuring that the relative position adjustment process between the second adsorption channel 31 and the first adsorption channel 22 remains linear and controllable. After the guide flange is embedded in the groove 21, a clearance fit is formed between its contact surface and the inner wall of the groove 21. For example, the clearance is controlled within the range of 0.1-0.3 mm, allowing the adjusting plate 3 to slide smoothly while preventing the adjusting plate 3 from tilting or wobbling due to excessive clearance. This structure further ensures that the adjusting plate 3 will not disengage from the groove 21 during sliding by matching the depth of the groove 21 with the height of the guide flange, for example, the depth of the groove 21 is 1.2-1.5 times the height of the guide flange, while also reducing the frictional resistance between the sliding surfaces.

[0038] The design of the sliding groove 21 and the guide flange, through mechanical limiting and guiding, strictly constrains the sliding trajectory of the adjusting plate 3, effectively avoiding movement deviation caused by unilateral force or assembly errors, and improving the reliability of adsorption force adjustment. This application achieves stable guidance of the adjusting plate 3 during the sliding process, avoiding the problem of adsorption hole misalignment caused by movement trajectory deviation, ensuring the accuracy of negative pressure suction adjustment, while reducing wear between sliding parts, extending the service life of the device, and reducing the risk of Xuan paper damage caused by mechanical jamming.

[0039] As one specific embodiment of the lifting mechanism in this application, refer to Figures 1-3 The lifting mechanism includes a vertical guide rail 1, two vertical guide rails 1 are symmetrically arranged, and mounting plates 11 are slidably connected to the inner side of each of the two vertical guide rails 1. The lower end of the mounting plate 11 is fixedly connected to the negative pressure suction cup 2. A first telescopic cylinder 12 is provided on the vertical guide rail 1. The first telescopic cylinder 12 has a first telescopic end 121. The lower end of the first telescopic end 121 is fixedly connected to the upper end face of the negative pressure suction cup 2.

[0040] The vertical guide rail 1 is a linear guide component used to constrain the direction of lifting and lowering motion. Its symmetrical distribution structure ensures balanced force during lifting and lowering. The mounting plate 11 is a load-bearing component that slides and connects to the guide rail. Specifically, it can be a steel plate fixed to the slider with bolts, used to transfer the load of the negative pressure suction cup 2 to the guide rail. The first telescopic cylinder 12 is a linear drive element that provides lifting power. Specifically, it can be a single-rod double-acting cylinder. Its telescopic end is rigidly connected to the negative pressure suction cup 2 through a flange, thereby directly controlling the lifting and lowering stroke of the suction cup.

[0041] Two vertical guide rails 1 are arranged parallel to each other on both sides of the printing press assembly. The mounting plate 11 forms a sliding pair with the inner slide rail of the guide rail via a slider. The negative pressure suction cup 2 is fixed to the lower end of the mounting plate 11 by bolts, so that the lifting and lowering movement of the suction cup is completely constrained by the guide rail. The first telescopic cylinder 12 is vertically mounted on the top of the guide rail, and its telescopic end extends downward and is fixed to the upper surface of the suction cup. When the cylinder extends or retracts, it drives the suction cup to move vertically along the guide rail. The symmetrical layout of the guide rail cancels out the lateral torque, ensuring that the suction cup always remains horizontal.

[0042] Compared to existing technologies, traditional automatic feeding equipment often uses chain or screw lifting mechanisms, which suffer from large deviations in motion trajectory and are prone to shaking. This solution eliminates positional offset during lifting by combining symmetrical dual-guide rails with direct cylinder drive, preventing uneven force on the Xuan paper caused by suction cup tilt. This application achieves precise vertical lifting of the negative pressure suction cup 2, effectively preventing misalignment of the Xuan paper or excessive localized force caused by suction cup positional offset, ensuring that the thin and fragile Xuan paper remains flat and wrinkle-free during adsorption and transfer, and improving the stability and reliability of automated feeding.

[0043] As a specific embodiment of the drive unit in this application, refer to Figures 1-4 The drive unit includes a second telescopic cylinder 4, which has a second telescopic end fixedly connected to the side wall of the adjusting plate 3. The second telescopic cylinder 4 is a pneumatically driven linear motion device, specifically a double-acting or single-acting cylinder. Its internal piston undergoes reciprocating linear motion under pneumatic pressure, thereby driving the second telescopic end to extend or retract. The second telescopic end is the moving part that outputs power from the cylinder, specifically a piston rod or push rod structure. Its end is fixed to the side wall of the adjusting plate 3 via a threaded connection or snap-fit, used to transmit the cylinder's thrust or pull force to the adjusting plate 3. The fixed connection to the side wall of the adjusting plate 3 means that a rigid connection is formed between the second telescopic end and the adjusting plate 3, specifically achieved through welding, bolting, or integral molding processes, ensuring that the adjusting plate 3 moves synchronously when the cylinder actuates.

[0044] The second telescopic cylinder 4 receives compressed air through the air passage system, driving the internal piston to move along the cylinder axis, thereby causing the second telescopic end to extend and retract. When the second telescopic end extends, it pushes the adjusting plate 3 to slide along the bottom of the negative pressure suction cup 2, reducing the overlapping area of ​​the second adsorption channel 31 and the first adsorption channel 22, thus reducing the negative pressure adsorption force. When the second telescopic end retracts, it pulls the adjusting plate 3 to slide in the opposite direction, increasing the overlapping area of ​​the second adsorption channel 31 and the first adsorption channel 22, thereby increasing the negative pressure adsorption force. By controlling the extension and retraction of the second telescopic end, the effective ventilation area of ​​the adsorption channel can be precisely adjusted, achieving dynamic adjustment of the adsorption force.

[0045] This solution uses a second telescopic cylinder 4 to drive the adjusting plate 3 to slide automatically, enabling rapid response to changes in adsorption force during equipment operation. This avoids adjustment delays or errors caused by manual intervention and reduces paper damage or adsorption failure due to unstable adsorption force. This application achieves precise control of the adsorption force on Xuan paper, ensuring stable adsorption of individual sheets while avoiding fiber damage or adsorption marks. It effectively solves the problems of paper damage, adhesion, and reduced printing quality caused by the unadjustable adsorption force in traditional equipment.

[0046] In a preferred embodiment of this application, a control mechanism is also included. The control mechanism includes an instruction input terminal, a pressure detection terminal, and a control adjustment terminal. The pressure detection terminal includes a pressure sensor, which is disposed on the bottom surface of the adjustment plate 3 and located around the second adsorption channel 31. After the suction value is input through the instruction input terminal, the control adjustment terminal controls the second telescopic cylinder 4 to adjust the extension and retraction of the second telescopic end, thereby adjusting the overlapping area of ​​the second adsorption channel 31 and the first adsorption channel 22, so that the negative pressure suction value detected by the pressure detection terminal is the same as the input suction value. The control mechanism refers to an automated system for realizing closed-loop adjustment of adsorption force. Specifically, it can be implemented using a PLC controller or an embedded microprocessor. It compares the set value received from the instruction input terminal with the real-time feedback value from the pressure detection terminal and outputs a control signal to the execution component. The pressure sensor is a sensing element used to detect negative pressure suction force. Specifically, it can be implemented using a piezoelectric or capacitive sensor. It is disposed on the bottom surface of the adjustment plate 3 and arranged around the adsorption channel to monitor the actual suction value of the adsorption area in real time. The command input end refers to the human-machine interface used to set the target suction value. This can be implemented using a touchscreen or a physical knob, allowing operators to input corresponding parameters based on the thickness or material differences of the Xuan paper. The control and adjustment end refers to the control unit used to drive the actuator's movements. This can be implemented using a proportional valve or a stepper motor driver, adjusting the stroke of the second telescopic cylinder 4 to change the overlapping area of ​​the adsorption channels.

[0047] Specifically, after the operator sets the target suction value via the command input terminal, the control mechanism compares the target value with the suction data detected in real time by the pressure sensor. If the actual suction is lower than the set value, the control adjustment terminal drives the second telescopic cylinder 4 to extend, causing the adjustment plate 3 to slide relative to the first adsorption channel 22, increasing the overlapping area of ​​the two to enhance the effective adsorption area, thereby reducing the local suction intensity while maintaining a constant negative pressure source power. If the actual suction is higher than the set value, the control mechanism reverses the adjustment to reduce the overlapping area to enhance the local suction. This adjustment process continues until the suction value fed back by the pressure sensor and the set value reach a dynamic balance, forming a closed-loop control system.

[0048] This solution, through the synergistic action of a pressure sensor and an automatic adjustment mechanism, dynamically maintains optimal adsorption force during the feeding of Xuan paper of varying thicknesses. This avoids paper slippage due to insufficient suction, while also preventing fiber damage or adsorption residue caused by excessive suction. This application achieves precise closed-loop control of the Xuan paper adsorption force, solving the problem of paper damage or adsorption failure caused by the unadjustable suction force in traditional fixed-aperture adsorption devices. It ensures that ultra-thin Xuan paper maintains its integrity and accurate positioning during automated feeding, while also adapting to the process requirements of Xuan paper of different weights.

[0049] For any parts not mentioned in this utility model, existing technologies can be used or referenced.

[0050] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0051] The above description is merely an embodiment of this utility model and is not intended to limit the scope of this 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 principle of this utility model should be included within the scope of the claims of this utility model.

Claims

1. An automatic feeding device for Xuan paper printing, characterized in that, The device includes a short-stroke vertical lifting mechanism located at the front end of the printing assembly of a printing machine. The driving end of the lifting mechanism is fixedly connected to a negative pressure suction cup (2). The bottom surface of the negative pressure suction cup (2) is provided with a plurality of first adsorption channels (22). An adjusting plate (3) is slidably connected to the bottom of the negative pressure suction cup (2). The adjusting plate (3) is provided with a plurality of second adsorption channels (31) that match the number and position of the first adsorption channels (22). The side wall of the negative pressure suction cup (2) is provided with a driving part for driving the adjusting plate (3) to slide. The adjusting plate (3) slides to adjust the overlapping area of ​​the second adsorption channels (31) and the first adsorption channels (22).

2. The automatic feeding device for Xuan paper printing according to claim 1, characterized in that, The second adsorption channel (31) is provided with a mesh plate (311), and the end face of the mesh plate (311) is flush with the bottom surface of the adjustment plate (3).

3. The automatic feeding device for Xuan paper printing according to claim 2, characterized in that, It also includes a negative pressure vacuum machine (5), and a gas guide hose (51) is connected between the negative pressure vacuum machine (5) and the inner cavity of the negative pressure suction cup (2).

4. The automatic feeding device for Xuan paper printing according to claim 1, characterized in that, The negative pressure suction cup (2) has a sliding groove (21) on its side wall, and the adjustment plate (3) has a guide flange that slides in cooperation with the sliding groove (21) on its side wall.

5. The automatic feeding device for Xuan paper printing according to claim 3, characterized in that, The lifting mechanism includes a vertical guide rail (1), two vertical guide rails (1) are symmetrically arranged, and an mounting plate (11) is slidably connected to the inner side of each of the two vertical guide rails (1). The lower end of the mounting plate (11) is fixedly connected to the negative pressure suction cup (2). A first telescopic cylinder (12) is provided on the vertical guide rail (1). The first telescopic cylinder (12) has a first telescopic end (121). The lower end of the first telescopic end (121) is fixedly connected to the upper end face of the negative pressure suction cup (2).

6. The automatic feeding device for Xuan paper printing according to claim 1, characterized in that, The drive unit includes a second telescopic cylinder (4), which has a second telescopic end and is fixedly connected to the side wall of the adjusting plate (3).

7. An automatic feeding device for Xuan paper printing according to any one of claims 1-6, characterized in that, It also includes a control mechanism, which includes an instruction input terminal, a pressure detection terminal, and a control adjustment terminal. The pressure detection terminal includes a pressure sensor, which is set on the bottom surface of the adjustment plate (3) and is located around the second adsorption channel (31). After the suction value is input through the instruction input terminal, the control adjustment terminal controls the second telescopic cylinder (4) to adjust the telescopic amount of the second telescopic end, thereby adjusting the overlapping area of ​​the second adsorption channel (31) and the first adsorption channel (22), so that the negative pressure suction value detected by the pressure detection terminal is the same as the input suction value.

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