A reciprocating high-precision large-format inkjet printer based on a concave path structure

Abstract

The application discloses a reciprocating high-precision large-format inkjet printer based on a concave belt structure, which comprises fixed and movable platform main frames, five main rolling shafts, a punching conveyor belt, a negative pressure adsorption device, a platform driving mechanism and an inkjet printing unit. A shaft and an E shaft are arranged on the movable platform, and B / C / D shafts are arranged on the fixed platform. The punching conveyor belt forms a transverse concave loop around the five shafts. When the movable platform moves forward and backward, the stretching length of the conveyor belt between the A shaft and the B shaft is equal to the contraction length of the conveyor belt from the A section to the D section via the E section, so that the section of the conveyor belt remains relatively static, the positioning of the printing object is stable, and the positioning error caused by the soft connection and the friction connection is eliminated. The conveyor belt driving motor can be connected to any main rolling shaft, and when the motor is connected to the A shaft and adopts a servo or stepping motor, a locking device can be omitted. After printing, the printing object is vertically dropped and flatly stacked by using the forward inertia of the printing object and the reverse trend of the platform. The application can realize high-precision printing of the offset printing level and continuous flat stacking and collection of large-format single printing objects by matching the comb-tooth-shaped staggered negative pressure cavity groove.

Description

Technical Field

[0001] This invention relates to the field of inkjet printing equipment technology, and in particular to a reciprocating inkjet printer suitable for large-format, high-precision continuous inkjet printing operations. Background Technology

[0002] Inkjet printers, as commonly used digital image output devices, have been widely applied in industries such as advertising, decoration, art reproduction, packaging, and textile printing and dyeing. Based on the movement of the substrate during the printing process, the mainstream large-format inkjet printers currently employ the following paper feeding structures: The first type is the roller-type paper feeding structure. The substrate is transported by the friction between the driving roller and the driven roller. This method has a simple structure, but the friction is unstable and prone to problems such as slippage, deviation, and wrinkling. In addition, it has high requirements for the thickness and coating of the substrate, making it difficult to meet the increasingly diverse printing requirements.

[0003] The second type is the flat, fixed structure. The substrate is laid flat and fixed on the printing platform, and the printhead moves in both the X and Y directions to complete the printing of the entire image. This method has high positioning accuracy, but the printhead movement mechanism is complex, the equipment is bulky, and it can only process one substrate per operation, resulting in low efficiency.

[0004] The third type is the conveyor belt structure. The substrate is adhered to a circulating conveyor belt, which carries the substrate continuously through the printing area. This is currently the most common solution for large-format inkjet printers.

[0005] In existing conveyor belt inkjet printers, the most typical structure uses two main rollers to support the conveyor belt, with a drive motor mounted on one of the rollers. The motor drives the conveyor belt to reciprocate, and the substrate is adhered to the surface of the conveyor belt by the negative pressure generated by a fixed negative pressure chamber beneath the belt, moving with it. During printing, the substrate is dragged by the conveyor belt under the inkjet printhead fixed to the frame, completing line-by-line printing.

[0006] However, the aforementioned existing conveyor belt inkjet printers have the following significant drawbacks: (1) Limited printing accuracy. The positioning of the substrate depends entirely on the movement of the conveyor belt, which is driven by the drive shaft through friction. The elastic elongation of the conveyor belt, the clearance of the bearings, the eccentricity error of the drive wheel, and the frictional connection between the conveyor belt and each roller shaft will all cause the substrate to have a small positional shift and repeated positioning error during the printing process, making it difficult to achieve high-precision printing, especially offset printing level accuracy.

[0007] (2) The position of the pores in the negative pressure adsorption will change. In the existing structure, the negative pressure cavity is fixedly set below the conveyor belt. During the cyclic movement of the conveyor belt, the position of the pores on it relative to the negative pressure cavity changes continuously, causing the adsorption position of the negative pressure cavity on the substrate to shift, which will further affect the positioning accuracy of the substrate.

[0008] (3) It is difficult to collect and stack large-format single-sheet printed materials. Since the existing printing platform is a fixed structure, especially after the large-format single-sheet printed materials are printed, the printed materials cannot be laid out and stacked in an orderly manner without interrupting the printing process. They can only be sent out by the rotation of the conveyor belt or stacked at the end of the conveyor belt, which makes it difficult to achieve continuous operation.

[0009] Therefore, how to design an inkjet printer that can both ensure printing accuracy and solve the problem of continuous flat stacking and collection of large-format printed materials has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0010] The purpose of this invention is to address the technical problems of existing conveyor belt inkjet printers, such as low printing accuracy, positioning errors caused by changes in the position of the negative pressure adsorption holes, and difficulty in continuously laying and stacking large-format single-sheet printing materials, by providing a reciprocating high-precision large-format inkjet printer based on a concave conveyor belt structure.

[0011] This invention provides a reciprocating high-precision large-format inkjet printer based on a concave conveyor belt structure, including a fixed platform main frame, a movable platform main frame, five main rolling shafts, a perforated conveyor belt, a fixed negative pressure chamber, a movable negative pressure chamber, a platform drive mechanism, a conveyor belt drive motor, and an inkjet printing unit.

[0012] in: The main frame of the fixed platform is equipped with a slide rail, a platform drive screw, and a platform drive motor; the lower part of the main frame of the movable platform is equipped with a slider, which slides with the slide rail and is connected to the platform drive screw through a screw connecting seat, so that the movable platform can move linearly back and forth along the slide rail under the drive of the platform drive motor.

[0013] The five main rolling axes are A-axis, B-axis, C-axis, D-axis, and E-axis. A-axis and E-axis are mounted on the main frame of the movable platform; B-axis, C-axis, and D-axis are mounted on the main frame of the fixed platform. Bearings are installed at both ends of each main rolling axis.

[0014] The perforated conveyor belt passes sequentially around axes A, B, C, and D on its inner side. Axe E presses in from the outer side of the conveyor belt between axes A and D to tighten it, forming a transverse "U"-shaped closed loop structure.

[0015] The conveyor belt drive motor is connected to any one of the five main rolling shafts to drive the conveyor belt in a cyclical manner. Depending on the connection position and type of the conveyor belt drive motor, the locking method for the A-axis falls into three categories: When the conveyor belt drive motor is connected to the A-axis and a servo motor or stepper motor is used, the motor's own locking function keeps the A-axis locked during printing, requiring no additional locking device; when the conveyor belt drive motor is connected to the A-axis but a regular motor is used, the regular motor does not have a self-locking function, requiring a separate locking device on the A-axis; when the conveyor belt drive motor is connected to an axis other than the A-axis, such as the B, C, D, or E axes, regardless of the motor type, a separate locking device must be installed on the A-axis to lock it during printing.

[0016] The fixed negative pressure chamber is set on the main frame of the machine's fixed platform, below the conveyor belt between the A and B axes; the movable negative pressure chamber is set on the main frame of the movable platform, below the conveyor belt between the A and B axes; the two are arranged in a comb-like staggered pattern to continuously form negative pressure adsorption support for the substrate during the back-and-forth movement of the movable platform.

[0017] The inkjet printing unit is fixedly mounted on the main frame of the machine's fixed platform, with the inkjet nozzle facing downwards and directly above the conveyor belt between axes A and B.

[0018] Compared with existing conveyor belt inkjet printers, the present invention has the following advantages: 1. Significantly improved printing accuracy, achieving offset printing level precision. Because axes A and E are mounted on a movable platform, while axes B, C, and D are mounted on a fixed platform, when the movable platform moves back and forth relative to the fixed platform, the extension length of the conveyor belt between axes A and B is exactly equal to the contraction length of the conveyor belt from axis A through axis E to axis D. This ensures that the conveyor belt segment between axes A and B remains relatively stationary. The substrate, held in place by negative pressure in this segment, also maintains a stable position during printing. The pushing motion of the substrate relies entirely on the precise linear motion of the platform drive motor and the lead screw mechanism, eliminating soft and frictional connections. Therefore, positioning errors caused by conveyor belt elastic elongation and frictional fluctuations are eliminated, resulting in significantly improved printing accuracy, reaching offset printing level precision.

[0019] 2. Stable and reliable negative pressure adsorption. The fixed and movable negative pressure chambers are arranged in a comb-like staggered pattern, forming a continuous negative pressure adsorption working surface. This ensures stable and uniform negative pressure adsorption support for the substrate throughout the entire movement of the movable platform. Simultaneously, because the conveyor belt between the A and B axes is relatively stationary, the positions of the holes on the conveyor belt relative to the negative pressure chambers remain unchanged, ensuring the stability of the negative pressure adsorption points.

[0020] 3. Enables efficient continuous printing and flat stacking of large-format single-sheet printing. Since the inkjet printing unit is fixed to the main frame of the machine's fixed platform, the movable platform drives the substrate in a reciprocating linear motion below the inkjet printhead, allowing for line-by-line printing beyond the single inkjet print area. After printing, the forward movement of the conveyor belt and the backward movement of the movable platform work together to cause the substrate to fall vertically into the collection area below the fixed platform, achieving flat stacking of sheets without the need for additional mechanical levers or pushing mechanisms. The structure is simple and the stacking is neat.

[0021] 4. Compact structure and reliable transmission. The entire printing platform adopts a 5-main rolling shaft and a U-shaped conveyor structure, which is simple in structure and reasonable in layout. The platform drive uses a servo motor or stepper motor in conjunction with a ball screw, which can achieve micron-level position control. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 for Figure 1 Top view; Figure 3 This is a schematic diagram of the structure of the present invention with an inkjet printing unit installed; Explanation of reference numerals in the attached figures: 1—A-axis; 2—B-axis; 3—C-axis; 4—D-axis; 5—E-axis; 6—Perforating conveyor belt; 7—Moving negative pressure chamber; 8—Fixed negative pressure chamber; 9—Conveyor belt drive motor; 10—Moving platform main frame; 11—Fixed platform main frame; 12—Slide rail; 13—Platform drive motor; 14—Platform drive screw; 15—Slider; 16—Screw connector; 17—Inkjet printing unit. Detailed Implementation

[0023] The specific embodiments of the present invention are described below with reference to the accompanying drawings. Example 1

[0024] like Figure 1 , Figure 2 As shown, the present invention provides a reciprocating high-precision large-format inkjet printer based on a concave conveyor structure, which mainly includes a fixed platform main frame 11, a movable platform main frame 10, five main rolling axes including A-axis 1, B-axis 2, C-axis 3, D-axis 4, and E-axis 5, a perforating conveyor belt 6, a movable negative pressure chamber 7, a fixed negative pressure chamber 8, a conveyor belt drive motor 9, a platform drive motor 13, a platform drive screw 14, a slide rail 12, a slider 15, a screw connecting seat 16, an A-axis locking device, and an inkjet printing unit 17.

[0025] A slide rail 12 and a platform drive screw 14 are horizontally mounted on the main frame 11 of the fixed platform. The platform drive screw 14 is driven to rotate by a platform drive motor 13, which can be a servo motor or a stepper motor. A slider 15 is mounted below the movable platform main frame 10. The slider 15 is slidably engaged on the slide rail 12 and connected to the platform drive screw 14 via a screw connecting seat 16. When the platform drive motor 13 drives the screw 14 to rotate, the screw connecting seat 16 drives the slider 15 to reciprocate linearly along the slide rail 12, thereby enabling the movable platform main frame 10 to perform precise reciprocating linear motion relative to the fixed platform main frame 11.

[0026] Bearings are installed at both ends of the five main rolling shafts, which are horizontally mounted on the platform. The bearing seats of A-axis 1 and E-axis 5 are fixed on the main frame of the movable platform 10; the bearing seats of B-axis 2, C-axis 3 and D-axis 4 are fixed on the main frame of the machine tool fixed platform 11.

[0027] The perforating conveyor belt 6 is an annular belt with evenly distributed small holes, which sequentially passes around axis A1, axis B2, axis C3, and axis D4 on its inner side. Axis E5, serving as a pressure adjustment shaft, is mounted on the main frame 10 of the movable platform and presses into the outer side of conveyor belt 6 between axis A1 and axis D4, causing conveyor belt 6 to be tightened outwards. This creates a flat working area section, the printing area conveyor belt section, between axis A1 and axis B2 in a transverse U-shaped closed loop. Axis C3 and axis D4 are located on the side away from the working area of ​​axis A1 and axis B2, forming the return section of the loop.

[0028] By adjusting the position of axis E5, the conveyor belt 6 can be kept at a suitable tension.

[0029] The conveyor belt drive motor 9 can be connected to any one of the five main rolling shafts. Depending on the connection location and motor type, the locking method for axis A 1 can be categorized into the following three cases: ① When the conveyor belt drive motor 9 is connected to axis A1 and a servo motor or stepper motor is selected, the motor's own shaft locking function is used to keep axis A1 locked, so that the conveyor belt 6 in the working section between axis A1 and axis B2 remains relatively stationary during the printing process.

[0030] ② When the conveyor belt drive motor 9 is connected to axis A1 but a regular motor is used, the output shaft of the regular motor can rotate freely after power is cut off and cannot lock axis A1. Therefore, an independent locking device still needs to be set on axis A1 to lock axis A1 during printing.

[0031] ③ When the conveyor belt drive motor 9 is connected to an axis other than A-axis 1, such as B-axis 2, C-axis 3, D-axis 4 or E-axis 5, regardless of the motor type, an independent locking device must be set on A-axis 1 to lock A-axis 1 during printing. At this time, the conveyor belt drive motor 9 drives the connected axis to rotate, and through friction, drives the punching conveyor belt 6 to perform a cyclic motion, which in turn drives the other driven shafts to rotate. A-axis 1, being locked, does not rotate with the movement of the conveyor belt.

[0032] This embodiment uses a conveyor belt drive motor 9 connected to the C-axis 3 and a locking device installed on the A-axis 1 as an example for explanation. The conveyor belt drive motor 9 is mounted on the main frame 11 of the machine tool fixed platform and connected to one end of the C-axis 3 via a coupling or synchronous belt. When the conveyor belt drive motor 9 drives the C-axis 3 to rotate, the C-axis 3 drives the perforated conveyor belt 6 to circulate through friction, thereby driving the A-axis 1 and E-axis 5 to rotate accordingly.

[0033] Below the flat working area section of conveyor belt 6 between axis A1 and axis B2 in the transverse U-shaped closed loop, two groups of negative pressure cavities are set up: The fixed negative pressure chamber 8 is fixedly installed on the main frame 11 of the machine tool fixed platform; The movable negative pressure chamber 7 is fixedly installed on the main frame 10 of the movable platform.

[0034] Both the fixed negative pressure chamber 8 and the movable negative pressure chamber 7 are elongated groove structures with multiple elongated teeth arranged perpendicular to the printing direction on their top surfaces. A small gap is left between the top surface of the teeth and the bottom surface of the conveyor belt 6. These teeth, arranged in a comb-like staggered pattern, form a continuous negative pressure adsorption working surface. The inside of the negative pressure chamber is connected to a negative pressure fan (not shown in the figure) via pipes. When the negative pressure fan is working, outside air is drawn into the negative pressure chamber through small holes in the conveyor belt 6, causing the substrate to be adsorbed onto the upper surface of the conveyor belt 6.

[0035] Since the conveyor belt 6 of the working section between axis A1 and axis B2 remains relatively stationary during the printing process, the position of the movable negative pressure chamber 7 relative to the conveyor belt 6 remains unchanged, and the position of the negative pressure adsorption hole is always consistent.

[0036] Depending on the connection position and type of the conveyor belt drive motor 9, the locking method of axis A1 can be categorized as follows: The conveyor belt drive motor 9 is connected to the C-axis 3, and an electromagnetic brake (not shown in the figure) is installed on the A-axis 1. When the printing substrate is transported by the conveyor belt 6 to the working area between the A-axis 1 and the B-axis 2 and is attracted by negative pressure, the electromagnetic brake is activated to lock the A-axis 1 relative to the movable platform main frame 10, preventing the A-axis 1 from rotating, thereby ensuring that the conveyor belt 6 in the working section between the A-axis 1 and the B-axis 2 is relatively stationary.

[0037] When the conveyor belt drive motor 9 is connected to axis A1 but a regular motor is used, an electromagnetic brake or mechanical locking pin should be installed on axis A1 as a locking device.

[0038] When the conveyor belt drive motor 9 is connected to axis A1 and a servo motor or stepper motor is used, the servo motor or stepper motor itself has a shaft locking function, and no locking device is provided on axis A1.

[0039] like Figure 3 As shown, the inkjet printing unit 17 is fixedly mounted on the main frame 11 of the machine tool platform, with the inkjet nozzle facing downwards and directly above the conveyor belt 6 between axis A1 and axis B2. The inkjet printing unit 17 can be equipped with one or more sets of printheads in the printing direction as needed.

[0040] The entire printing process is as follows: ① Feeding: The conveyor belt drive motor 9 drives the conveyor belt 6 to move, transporting the substrate to be printed from the feeding end to the printing work area between axis A1 and axis B2, and fixing it on the conveyor belt 6 by negative pressure adsorption.

[0041] ② Axis locking and positioning: Axis 1 is locked, either by the electromagnetic brake being energized and locked, or by the servo / stepper motor connected to Axis 1 being self-locked. The movable platform is also precisely positioned to the printing start position through the lead screw mechanism.

[0042] ③ Printing: The platform drive motor 13 drives the lead screw 14 to rotate, causing the movable platform main frame 10 to make precise linear reciprocating motion along the slide rail 12 relative to the fixed platform main frame 11. A-axis 1 is locked and moves with the movable platform, while B-axis 2 remains stationary. The distance between the two will extend as driven by the drive motor 13. Since the extension length of this section of the conveyor belt 6 is exactly compensated by the contraction of the section of the conveyor belt from A-axis 1 through E-axis 5 to D-axis 4, this section of the conveyor belt 6 always remains relatively stationary. The positional change of the substrate relative to the fixed platform main frame 11 is completely determined by the precise movement of the platform drive motor 13 and the lead screw 14.

[0043] During the reciprocating motion of the movable platform driven by the platform drive motor 13, the inkjet printhead 17 prints ink line by line above the substrate. Since the position change of the substrate is precisely controlled by the lead screw mechanism, errors such as elastic elongation and friction fluctuation caused by traditional conveyor belt friction drive are eliminated, thus enabling high-precision offset printing.

[0044] ④ Material Collection and Stacking: After one substrate is printed, the locking of A-axis 1 is released, i.e., the electromagnetic brake is released or the servo / stepper motor is unlocked. The conveyor belt drive motor 9 drives the conveyor belt 6 to rotate, applying a forward motion tendency to the substrate adsorbed on the conveyor belt 6. At the same time, the platform drive motor 13 drives the movable platform main frame 10 to move A-axis 1 and E-axis 5 back to the printing start position, applying a backward motion tendency to the substrate. Under the combined action of these two opposite motion tendencies, the substrate loses its net horizontal displacement in the area between A-axis 1 and B-axis 2, falls vertically from the conveyor belt 6, and stacks flat in the collection area below and in front of the fixed platform main frame 11. Then, the platform drive motor 13 drives the movable platform to reposition itself to the printing start position of the next substrate, entering the next printing cycle.

[0045] By repeating this process, high-precision continuous printing of large-format single-sheet printing materials and orderly flat-laying and stacking collection can be achieved. Example 2

[0046] This embodiment is basically the same as embodiment 1, except that the teeth of the fixed negative pressure chamber 8 and the movable negative pressure chamber 7 are alternately staggered along the printing direction, and the gap between the teeth is covered by the teeth of the other side, forming a complete and continuous negative pressure adsorption working surface, which avoids the disturbance of the gap between the teeth to the adsorption of the substrate. Example 3

[0047] This embodiment is basically the same as embodiment 1, except that the bearing seats of A-axis 1 and E-axis 5 are mounted on the main frame 10 of the movable platform through linear guide pairs, and an adjusting screw is provided on E-axis 5 to precisely adjust the tension of the conveyor belt 6 before printing. Example 4

[0048] This embodiment is basically the same as Embodiment 1, except that the conveyor belt drive motor 9 is a servo motor or stepper motor, and is directly connected to axis A1 as the drive source for axis A1. Since the conveyor belt drive motor 9 has its own shaft locking function, no additional locking devices such as electromagnetic brakes or mechanical locking pins are required on axis A1. During printing, the conveyor belt drive motor 9 remains locked, keeping axis A1 stationary, and similarly keeping the working section of the conveyor belt 6 between axis A1 and axis B2 relatively stationary. This solution reduces the number of components in the locking device. Example 5

[0049] This embodiment is basically the same as Embodiment 1, except that the conveyor belt drive motor 9 is connected to either axis B2 or axis D4, and an electromagnetic brake is installed on axis A1 as a locking device. Since the conveyor belt drive motor 9 is not connected to axis A1, the conveyor belt 6 will drive axis A1 to rotate during the cyclic movement. Therefore, axis A1 must be locked by the electromagnetic brake during printing to ensure that the working section of the conveyor belt 6 remains relatively stationary. Example 6

[0050] This embodiment is basically the same as Embodiment 1, except that the conveyor belt drive motor 9 is a common DC motor or an AC asynchronous motor, and is directly connected to the A-axis 1. Since a common motor does not have a self-locking function, it cannot maintain the locked state of the A-axis 1 by itself during the printing process. Therefore, an electromagnetic brake is still required on the A-axis 1 as a locking device, which is energized to lock the axis during printing.

[0051] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A reciprocating high-precision large-format inkjet printer based on a concave conveyor structure, characterized in that, include: The main frame (11) of the machine tool fixed platform is provided with a slide rail (12), a platform drive screw (14) and a platform drive motor (13). The platform drive screw (14) is connected to the slide rail (12) through a screw connecting seat (16). The main frame (10) of the movable platform has a slider (15) below it. The slider (15) is slidably engaged with the slide rail (12). The slider (15) is connected to the platform drive screw (14) through the screw connecting seat (16), so that the movable platform moves linearly back and forth along the slide rail (12) under the drive of the platform drive motor (13). Five main rolling shafts are A-axis (1), B-axis (2), C-axis (3), D-axis (4) and E-axis (5). A-axis (1) and E-axis (5) are mounted on the main frame of the movable platform (10), while B-axis (2), C-axis (3) and D-axis (4) are mounted on the main frame of the fixed platform (11). Bearings are provided at both ends of each main rolling shaft. The perforated conveyor belt (6) passes in sequence around the A-axis (1), the B-axis (2), the C-axis (3) and the D-axis (4) on its inner side. The E-axis (5) presses in and tightens the perforated conveyor belt (6) from the outside between the A-axis (1) and the D-axis (4), so that the perforated conveyor belt (6) forms a transverse "U"-shaped closed loop structure. The conveyor belt drive motor (9) is connected to any one of the five main rolling shafts and is used to drive the perforated conveyor belt (6) to run in a cycle. A fixed negative pressure chamber (8) is set on the main frame (11) of the machine tool fixed platform, below the perforated conveyor belt (6) between the A axis (1) and the B axis (2), and forms a negative pressure adsorption area with the holes on the perforated conveyor belt (6); The movable negative pressure chamber (7) is set on the main frame (10) of the movable platform, below the perforated conveyor belt (6) between the A axis (1) and the B axis (2). The fixed negative pressure chamber (8) and the movable negative pressure chamber (7) are arranged in a comb-like staggered manner to continuously form negative pressure adsorption support for the substrate during the back-and-forth movement of the movable platform. The locking device is provided when the conveyor belt drive motor (9) is connected to the A-axis (1) and is a servo motor or a stepper motor. The conveyor belt drive motor (9) locks itself to replace the locking device. When the conveyor belt drive motor (9) is connected to the A-axis (1) and is a regular motor, or is connected to an axis other than the A-axis (1), the locking device is provided on the A-axis (1) to lock the A-axis (1) relative to the movable platform main frame (10) during printing. as well as The inkjet printing unit (17) is fixedly installed on the main frame (11) of the machine tool fixed platform, with the inkjet nozzle facing downwards and directly above the perforated conveyor belt (6) between the A axis (1) and the B axis (2).

2. The reciprocating high-precision large-format inkjet printer according to claim 1, characterized in that, The teeth of the fixed negative pressure chamber (8) and the teeth of the movable negative pressure chamber (7) are alternately staggered along the movement direction of the perforated conveyor belt (6), and the top surfaces of the teeth of both form a continuous negative pressure adsorption working surface between the perforated conveyor belt (6).

3. The reciprocating high-precision large-format inkjet printer according to claim 1, characterized in that, The E-axis (5) is a clamping adjustment axis, the position of which can be adjusted relative to the main frame (10) of the movable platform to tension the perforated conveyor belt (6).

4. The reciprocating high-precision large-format inkjet printer according to claim 1, characterized in that, When the conveyor belt drive motor (9) is a common motor and is connected to the A-axis (1), the locking device is provided on the A-axis (1). The locking device is an electromagnetic brake or a mechanical locking pin, which is used to lock the A-axis (1) during the printing process to prevent it from rotating with the movement of the punching conveyor belt (6).

5. The reciprocating high-precision large-format inkjet printer according to claim 1, characterized in that, The platform drive motor (13) is a servo motor or a stepper motor, which works in conjunction with the platform drive screw (14) to achieve micron-level position control.

6. The reciprocating high-precision large-format inkjet printer according to claim 1, characterized in that, When the conveyor belt drive motor (9) is connected to a shaft other than the A-axis (1), the locking device of the A-axis (1) is an electromagnetic brake or a mechanical locking pin, which is used to prevent the A-axis (1) from rotating with the movement of the punching conveyor belt (6) during the printing process.

7. The reciprocating high-precision large-format inkjet printer according to claim 1, characterized in that, The distance between the A-axis (1) and the B-axis (2) is greater than the width of a single inkjet printout of the inkjet printing unit (17).

8. The reciprocating high-precision large-format inkjet printer according to claim 1, characterized in that, The difference between the effective length of the conveyor belt along the path from A-axis (1) through E-axis (5) to D-axis (4) and the effective length of the conveyor belt between A-axis (1) and B-axis (2) is equal to the maximum travel of the movable platform.

9. The reciprocating high-precision large-format inkjet printer according to claim 1, characterized in that, The maximum stroke of the main frame (10) of the movable platform is not less than the width of a single inkjet printout of the inkjet printing unit (17).

10. The reciprocating high-precision large-format inkjet printer according to claim 1, characterized in that, After printing is completed, the conveyor belt drive motor (9) drives the perforated conveyor belt (6) to apply a forward motion tendency to the substrate, while the platform drive motor (13) drives the movable platform main frame (10) to retract to the printing start position and apply a backward motion tendency to the substrate. Under the combined action of the forward motion tendency and the backward motion tendency, the substrate falls vertically and is stacked flat in the collection area in front of and below the fixed platform main frame (11).

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