Multi-jet high-speed variable data inkjet printer

Abstract

The application relates to the field of code ink-jet printers, and discloses a multi-nozzle high-speed variable data code ink-jet printer, which is characterized in that the technical scheme comprises a rack, an adjusting roller, a plurality of winding rollers and a plurality of nozzles arranged on the rack, the adjusting roller and the winding rollers are used for winding a to-be-printed object, the adjusting roller is slidably connected to the rack, a linear driving element is fixedly connected to the rack, the linear driving element drives the adjusting roller to slide on the rack to adjust the position of the to-be-printed object and the nozzles, a control system comprises an image acquisition module, a stroboscopic element and an image processing module, the image acquisition module shoots an image of a code ink-jet position to define the image information, the image processing module acquires the image information and obtains the code ink-jet position according to a code ink-jet position identification strategy, the code ink-jet position reflects the position of the code ink-jet on the to-be-printed object, if the code ink-jet position is built in a printing range, standby signals are generated to the stroboscopic element and the image acquisition module, and if the code ink-jet position exceeds the printing range, adjusting signals are generated to the linear driving element to adjust the printing position.

Description

Technical Field

[0001] This invention relates to the field of inkjet printers, and more specifically to a multi-head high-speed variable data inkjet printer. Background Technology

[0002] An inkjet printer is a microcontroller-controlled device that marks products using a non-contact method. It applies pressure to the ink within the system by controlling an internal gear pump or by supplying compressed gas externally, forcing the ink through a nozzle with an aperture of tens of micrometers. A crystal oscillation signal applied above the nozzle splits the continuous ink stream into droplets of equal size and frequency with a specific spacing. These droplets are charged as they pass through charging electrodes, the amount of charge controlled by the CPU. A detection electrode then checks the actual charge and phase of each droplet. Finally, the charged droplets are deflected in a deflection field created by deflection electrodes and ejected from the printhead, striking different locations on the product surface to form various texts, patterns, and other markings. It can be used to print production dates, batch numbers, barcodes, QR codes, trademarks, anti-counterfeiting marks, and Chinese characters. During operation, the inkjet printer does not have strict requirements on the printing position; it only needs to ensure the printed content is within a certain range and complete. High-speed inkjet printers can print at speeds up to 80 meters per minute, which places high demands on the coordination between the moving speed of the printed object and the printing speed. However, existing inkjet printers have difficulty monitoring the printing position during the printing process, and by the time defective parts are discovered, a large number of defective parts have already been generated. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a multi-head high-speed variable data inkjet printer to overcome the above-mentioned defects in the existing technology.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A multi-head high-speed variable data inkjet printer includes a frame, on which are mounted an adjusting roller, several winding rollers, and several printheads. The adjusting roller and winding rollers are for winding the object to be printed. The adjusting roller is slidably connected to the frame. A linear drive is fixedly connected to the frame, and the linear drive drives the adjusting roller to slide on the frame to adjust the position of the object to be printed and the printheads facing each other. The inkjet printer is equipped with a control system, which includes...

[0006] The image acquisition module captures images of the inkjet-printed area and defines them as image information.

[0007] A strobe element is mounted on the frame and operates synchronously with the image acquisition module.

[0008] The image processing module has a preset inkjet printing position recognition strategy. The image processing module acquires the image information and obtains the inkjet printing position according to the inkjet printing position recognition strategy. The inkjet printing position reflects the position of the inkjet printing on the printed object. The inkjet printing position is compared with a preset printing range. If the inkjet printing position is within the printing range, a standby signal is generated to the strobe element and the image acquisition module. If the inkjet printing position exceeds the printing range, an adjustment signal is generated to the linear drive to adjust the printing position.

[0009] In this invention, preferably, the inkjet printing location identification strategy includes an inkjet printing identification step, which includes:

[0010] Several line segments are identified in the image information to be defined as basic line segments. Two basic line segments that are parallel are defined as a group of parallel line segments. A group of parallel line segments that intersect is defined as a reference block. The intersection relationship is specifically that each basic line segment in one group of parallel line segments intersects with two basic line segments in another group of parallel line segments. The basic line segments in each reference block are extended to form several closed quadrilateral regions. The quadrilateral region with the largest area is defined as the coding region. The coding region is specifically the area covered by the QR code on the image information.

[0011] In this invention, preferably, the inkjet printing position identification strategy includes an inkjet printing positioning step, which specifically includes:

[0012] The coding area is acquired, its four vertices are identified, and the four edges of the printed object within the image information are identified. Two edges along the conveying direction of the printed object are defined as reference edges, and the other two edges are defined as distance judgment edges. An auxiliary line segment parallel to the reference edges is drawn, such that the auxiliary line segment intersects the vertex to form several distance line segments. The distance line segment starts from the vertex and ends at the intersection of the auxiliary line segment and the distance judgment edge. The length ratio of the distance line segment to the reference edge is calculated to define the coding position.

[0013] In this invention, preferably, the control system includes a displacement prediction module. The displacement prediction module controls the strobe element of the image acquisition module to operate at a preset time interval to acquire two image informations sequentially. The module identifies the inkjet printing position within the two image informations and compares them to calculate the displacement amount and displacement direction. The displacement amount reflects the change in the position of the inkjet printing area in the two image informations, and the displacement direction reflects the direction of movement of the inkjet printing area in the two image informations. Based on the displacement amount, displacement direction, and preset time interval, a critical moment is predicted. The critical moment reflects the moment when the inkjet printing position is about to exceed the printing position. When the time reaches the critical moment, the displacement prediction module generates an adjustment signal to the linear drive.

[0014] In this invention, preferably, the displacement prediction module is configured with an output distance calculation strategy. The output distance calculation strategy includes obtaining the position of the adjusting roller on the frame to define the current position, obtaining the radius of the adjusting roller, the radius of the winding roller, the position of the winding roller, and the inkjet printing movement distance to calculate the target position. The target position reflects the position of the winding roller on the frame after the linear drive is output. The radius of the winding roller reflects the radius of the two winding rollers adjacent to the adjusting roller. The position of the winding roller reflects the position of the two winding rollers adjacent to the adjusting roller on the frame. The inkjet printing movement distance reflects the length of the printed object moved after the adjusting roller is adjusted.

[0015] In this invention, preferably, the displacement prediction module is configured with a movement distance calculation strategy. The movement distance calculation strategy includes an adjustment direction judgment strategy and an adjustment distance selection strategy. Specifically, the direction judgment strategy involves obtaining the displacement direction. If the displacement direction is consistent with the conveying direction of the printed object, a linear drive component drives the adjusting roller to move away from the winding roller to increase the distance between the adjusting roller and the adjacent winding roller. If the displacement direction is opposite to the conveying direction of the printed object, a linear drive component drives the adjusting roller to move closer to the winding roller to decrease the distance between the adjusting roller and the winding roller.

[0016] The adjustment distance selection strategy specifically involves predicting the inkjet printing position at the critical moment based on the displacement amount, displacement direction, and preset interval time, defining the predicted position as the predicted position, calculating the inkjet printing movement distance based on the predicted position and printing range, and subtracting a preset error from the inkjet printing movement distance to obtain the inkjet printing movement distance.

[0017] In this invention, preferably, the position of the adjusting roller on the frame is specifically the position of the adjusting roller axis in a vertical section, and the position of the winding roller is specifically the position of the winding roller axis in a vertical section, wherein the vertical section reflects any section perpendicular to the adjusting roller.

[0018] In this invention, preferably, the frame is formed with a slide groove for the adjusting roller to slide, and a ranging component is provided on the frame. The ranging component measures the position of the axis of the adjusting roller relative to the starting point of the slide groove by means of contact or non-contact principle to obtain the position of the adjusting roller on the frame.

[0019] In this invention, preferably, the control system is equipped with a verification module. The verification module performs verification after the adjustment roller completes the position adjustment to adjust the size of the preset error. The image acquisition module acquires the verification image information and acquires the verification inkjet printing position within the verification image information. If the inkjet printing verification position falls within the printing range, the preset error is reduced by a unit value until the distance between the inkjet printing position and the printing range is less than the preset distance value.

[0020] The beneficial effects of this invention are:

[0021] 1. This invention utilizes the combination of an image acquisition module and a strobe element to acquire images of the inkjet printing area under high-speed motion. The image processing module acquires the position of the inkjet printing on the printed object and compares it with a preset printing range. This can be used to monitor the position of the inkjet printing and calculate the adjustment direction and distance of the adjustment roller based on the change in the inkjet printing position, so that the printing position can change accordingly, reducing the generation of waste parts, ensuring the continuous operation of the inkjet printer, and ensuring work efficiency.

[0022] 2. This invention uses a coding recognition step to identify the coding area of ​​an image. The recognition process is simple and highly accurate. The coding positioning step obtains the specific position of the coding area on the printed object. The coding position is represented by the ratio of the length of the distance line segment to the length of the reference edge line. It can obtain relatively accurate data without calculating the actual length of the distance line segment. Furthermore, the setting of the reference edge line eliminates the influence of lens distortion of the image acquisition unit. The entire calculation process is simpler while ensuring the reliability of the data. Attached Figure Description

[0023] Figure 1 This is a cross-sectional structural diagram of this embodiment;

[0024] Figure 2 This is a schematic diagram of the control system architecture in this embodiment.

[0025] Figure label:

[0026] 1. Frame; 2. Adjusting roller; 3. Winding roller; 4. Nozzle; 5. Image acquisition module; 6. Strobe element; 7. Image processing module; 8. Displacement prediction module; 9. Verification module. Detailed Implementation

[0027] 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.

[0028] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is described as "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is described as "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0030] Please also see Figures 1 to 2 This embodiment provides a multi-head high-speed variable data inkjet printer. For specific structural details, please refer to [link / reference needed]. Figure 1 The inkjet printer includes a frame 1, on which are mounted an adjusting roller 2, several winding rollers 3, and several printheads 4. The adjusting roller 2 and winding rollers 3 are used to wind the object to be printed. The object is released from the rightmost winding roller, passes through multiple winding rollers and adjusting rollers, and is output from the left side. The adjusting roller 2 is slidably connected to the frame 1, which has a groove for sliding. A ranging component is mounted on the frame 1. This component measures the position of the adjusting roller 2 relative to the starting point of the groove using contact or non-contact principles to obtain its position on the frame 1. For example, an infrared rangefinder is fixedly connected to the frame 1. The infrared rangefinder's measuring direction is along the length of the groove, and the rangefinder must be directly facing the adjusting roller 2. Therefore, when the adjusting roller 2 moves, the infrared rangefinder can obtain the position of the adjusting roller 2 relative to the frame 1. A linear drive unit is fixedly connected to the frame 1. The linear drive unit drives the adjusting roller 2 to slide on the frame 1 to adjust the position of the object to be printed and the printhead 4. In the same inkjet printer, the positions of each winding roller 3 are relatively fixed and can be obtained by measurement, while the position of the adjusting roller 2 can also be estimated by an infrared rangefinder.

[0031] The inkjet printer is equipped with a control system, which includes an image acquisition module 5, a strobe element 6, an image processing module 7, a displacement prediction module 8, and a verification module 9.

[0032] The image acquisition module and the strobe element need to be positioned facing the object to be printed. The image acquisition module 5 captures an image of the area to be printed and defines it as image information. The strobe element 6 is mounted on the frame 1 and works synchronously with the image acquisition module 5. When the flashing frequency of the strobe element 6 is close to or synchronized with the rotation or movement speed of the object being measured, the surface quality or running condition of the high-speed moving object can be easily observed by utilizing the persistence of vision or video synchronization. This characteristic can be used to acquire images of the object being printed during the high-speed printing process.

[0033] The image processing module 7 has a preset inkjet printing position recognition strategy. The image processing module 7 acquires image information and obtains the inkjet printing position according to the inkjet printing position recognition strategy. The inkjet printing position reflects the position of the inkjet printing on the printed object. The inkjet printing position is compared with the preset printing range. If the inkjet printing position is within the printing range, a standby signal is generated to the strobe element 6 and the image acquisition module 5. If the inkjet printing position exceeds the printing range, an adjustment signal is generated to the linear drive to adjust the printing position. This setting facilitates real-time monitoring of the inkjet printing position and timely adjustments, reducing the generation of defective parts.

[0034] The inkjet printing location recognition strategy includes inkjet printing recognition steps, which include:

[0035] Several line segments are identified in the image information and defined as basic line segments. Two basic line segments that are parallel are defined as a group of parallel line segments. Groups of parallel line segments that are intersecting are defined as reference blocks. The intersection relationship is specifically defined as each basic line segment in one group of parallel line segments intersecting with two basic line segments in another group of parallel line segments. The basic line segments in each reference block are extended to form several closed quadrilateral regions. The quadrilateral region with the largest area is defined as the coding region. The coding region is specifically the area covered by the QR code on the image information.

[0036] The inkjet printing location identification strategy includes an inkjet printing positioning step, which specifically includes:

[0037] The process involves acquiring the coding area, identifying its four vertices, and recognizing the four edges of the object to be printed within the image information. Two edges along the object's transport direction are defined as baseline edges, and the other two are defined as distance judgment edges. Auxiliary line segments parallel to the baseline edges are drawn, intersecting the vertices to form several distance segments. Each distance segment starts at a vertex and ends at the intersection of the auxiliary line segment and the distance judgment edge. The ratio of the distance segment's length to the baseline edge's length is calculated to define the coding position. In the coding positioning step, the coding position is represented by the ratio of the distance segment's length to the baseline edge's length. This eliminates the need to calculate the actual length of the distance segments, providing relatively accurate data. Furthermore, the baseline edge setting eliminates the influence of lens distortion from the image acquisition unit, simplifying the calculation process while ensuring data reliability. The specific coding position consists of eight data points. Each vertex includes two distance segments, for a total of four vertices, resulting in eight data points. The use of eight data points is specifically chosen to account for potential position shifts during the actual printing process, allowing for a more gradual change in vertex data.

[0038] The displacement prediction module 8 controls the strobe element 6 of the image acquisition module to operate at a preset time interval to acquire two image informations sequentially. It identifies and compares the inkjet printing position within the two image informations to calculate the displacement amount and direction. The displacement amount reflects the change in the inkjet printing area position in the two image informations, and the displacement direction reflects the direction of movement of the inkjet printing area in the two image informations. Based on the displacement amount, displacement direction, and preset time interval, a critical moment is predicted. The critical moment indicates the moment when the inkjet printing position is about to exceed the printing position. When the critical moment is reached, the displacement prediction module 8 generates an adjustment signal to the linear drive. This setting specifically aims to reduce the number of operations of the strobe element 6 and the image acquisition unit by extending the interval between the two calculations using a preset time interval. This setting can reduce errors in the measurement process, provide better detection results, and predict the adjustment time of the adjustment roller 2. When the predicted critical moment is reached, the adjustment roller 2 is adjusted, reducing the data processing load of the control system and achieving greater energy efficiency.

[0039] The displacement prediction module 8 is configured with an output distance calculation strategy. This strategy includes obtaining the position of the adjusting roller 2 on the frame 1 to define the current position, and obtaining the radius of the adjusting roller 2, the radius of the winding roller 3, the position of the winding roller 3, and the coding movement distance to calculate the target position. The target position reflects the position of the winding roller 3 on the frame 1 after the linear drive is output. The radius of the winding roller 3 reflects the radius of the two winding rollers 3 adjacent to the adjusting roller 2. The position of the winding roller 3 reflects the position of the two winding rollers 3 adjacent to the adjusting roller 2 on the frame 1. The coding movement distance reflects the length of the printed object moved after the adjusting roller 2 is adjusted. Specifically, the position of the adjusting roller 2 on the frame 1 is the position of its axis within a vertical section. The position of the winding roller 3 is specifically the position of its axis within a vertical section, where the vertical section refers to any section perpendicular to the adjusting roller 2.

[0040] The displacement prediction module 8 is configured with a movement distance calculation strategy, which includes an adjustment direction judgment strategy and an adjustment distance selection strategy. The direction judgment strategy specifically involves obtaining the displacement direction. If the displacement direction is consistent with the conveying direction of the printed object, the linear drive component drives the adjusting roller 2 to move away from the winding roller 3 to increase the distance between the adjusting roller 2 and the adjacent winding roller 3. If the displacement direction is opposite to the conveying direction of the printed object, the linear drive component drives the adjusting roller 2 to move closer to the winding roller 3 to decrease the distance between the adjusting roller 2 and the winding roller 3. For example, according to... Figure 1 If the measured displacement direction is from right to left, it means the inkjet printer position is gradually moving to the left side of the printed object. After adjusting roller 2, the inkjet printer needs to appear on the right side of the image information, which means the printed object needs to move a certain distance to the left. This distance is the inkjet printer movement distance. At this time, adjusting roller 2 should move downward. Conversely, if the measured displacement direction is from left to right, it means the inkjet printer position is gradually moving to the right side of the printed object. After adjusting roller 2, the inkjet printer needs to appear on the left side of the image information, which means the printed object needs to move a certain distance to the left. This distance is the inkjet printer movement distance. At this time, adjusting roller 2 should move upward.

[0041] The adjustment distance selection strategy is as follows: the predicted position is defined as the inkjet printing position at the critical moment based on the displacement amount, displacement direction, and preset interval time. The inkjet printing movement distance is calculated based on the predicted position and the printing range. The inkjet printing movement distance is then subtracted from the preset error to obtain the inkjet printing movement distance. The preset error is set primarily to account for system errors, ensuring the inkjet printing movement distance is slightly less than the actual printing movement distance, preventing the inkjet from exceeding the printing range during a single adjustment. The control system is equipped with a verification module 9. After the adjustment roller 2 completes its position adjustment, the verification module 9 verifies the preset error to adjust its magnitude. The image acquisition module acquires the verification image information and obtains the verification inkjet printing position within the verification image information. If the verified inkjet printing position falls within the printing range, the preset error is reduced by a unit value until the distance between the inkjet printing position and the printing range is less than the preset distance value. The verification module 9 is set primarily to account for discrepancies between the preset error value and the actual situation. Multiple adjustment processes are used to adjust the predicted error value to make it closer to the actual situation.

[0042] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A multi-head high speed variable data inkjet printer characterized by: The application relates to a printing machine comprising a frame (1), an adjusting roller (2), a plurality of winding rollers (3) and a plurality of nozzles (4) arranged on the frame (1), the adjusting roller (2) and the winding rollers (3) being used for winding a to-be-printed object, the adjusting roller (2) being in sliding connection with the frame (1), a linear driving element being fixedly connected to the frame (1), the linear driving element driving the adjusting roller (2) to slide on the frame (1) so as to adjust the position of the to-be-printed object and the nozzles (4) facing each other, and the printing machine being provided with a control system, the control system comprising an image acquisition module (5) for shooting an image of a printing position to define image information, a stroboscopic element (6) installed on the frame (1) and working synchronously with the image acquisition module (5), an image processing module (7) provided with a printing position recognition strategy, the image processing module (7) acquiring the image information and obtaining a printing position according to the printing position recognition strategy, the printing position reflecting the position of a printing code on the to-be-printed object, comparing the printing position with a preset printing range, and generating a standby signal to the stroboscopic element (6) and the image acquisition module (5) if the printing position is within the printing range or generating an adjusting signal to the linear driving element to adjust the printing position if the printing position is out of the printing range.

2. A multi-head high-speed variable data inkjet printer according to claim 1, characterized in that: The printing position recognition strategy comprises a printing code recognition step, the printing code recognition step comprising identifying a plurality of line segments in the image information to define basic line segments, judging two basic line segments with parallel relationship to define parallel line segment groups, judging the parallel line segment groups with intersection relationship to define reference blocks, the intersection relationship being that each basic line segment in one of the parallel line segment groups intersects with two basic line segments in another parallel line segment group, extending the basic line segments in each reference block to form a plurality of closed quadrilateral areas, and judging the largest quadrilateral area to define a printing code area, the printing code area being the covering area of a two-dimensional code on the image information.

3. A multi-head high-speed variable data inkjet printer according to claim 2, wherein: The printing position recognition strategy comprises a printing code positioning step, the printing code positioning step comprising acquiring the printing code area, identifying four vertices of the printing code area, identifying four edge lines of the to-be-printed object in the image information, wherein two edge lines along the conveying direction of the to-be-printed object are defined as reference edge lines, and the other two edge lines are defined as distance judgment edge lines, drawing an auxiliary line segment parallel to the reference edge lines, so that the auxiliary line segment intersects with the vertices to form a plurality of distance line segments, the distance line segments having the vertices as starting points and the intersection points of the auxiliary line segment and the distance judgment edge lines as ending points, and calculating the length ratio of the distance line segments and the reference edge lines to define the printing position.

4. A multi-head high-speed variable data inkjet printer according to claim 2, wherein: The control system comprises a displacement prediction module (8), which controls the stroboscopic element (6) of the image acquisition module to work at preset time intervals to acquire two image information in succession, identifies the inkjet position in the two image information and compares to calculate the displacement amount and the displacement direction, the displacement amount reflects the change amount of the inkjet area position in the two image information, and the displacement direction reflects the moving direction of the inkjet area in the two image information, the critical moment is predicted according to the displacement amount, the displacement direction and the preset interval time, the critical moment reflects the moment when the inkjet position is about to exceed the inkjet position, and when the time reaches the critical moment, the displacement prediction module (8) generates an adjustment signal to the linear drive.

5. A multi-head high-speed variable data inkjet printer according to claim 4, wherein: The displacement prediction module (8) is configured with an output distance calculation strategy, which comprises acquiring the position of the adjustment roller (2) on the rack (1) to define as the current position, acquiring the radius of the adjustment roller (2), the radius of the winding roller (3), the position of the winding roller (3) and the inkjet moving distance to calculate the target position, the target position reflects the position of the winding roller (3) on the rack (1) after the linear drive outputs, the winding roller radius reflects the radius of the two winding rollers (3) adjacent to the adjustment roller (2), the winding roller position reflects the position of the two winding rollers (3) adjacent to the adjustment roller (2) on the rack (1), and the inkjet moving distance reflects the length of the printed matter moved after the adjustment of the adjustment roller (2).

6. A multi-head high-speed variable data inkjet printer according to claim 5, wherein: The displacement prediction module (8) is configured with a moving distance calculation strategy, which comprises an adjustment direction judgment strategy and an adjustment distance selection strategy, the direction judgment strategy specifically acquires the displacement direction, if the displacement direction is consistent with the conveying direction of the printed matter, the linear drive drives the adjustment roller (2) to move away from the winding roller (3) to increase the distance between the adjustment roller (2) and the adjacent winding roller (3), if the displacement direction is opposite to the conveying direction of the printed matter, the linear drive drives the adjustment roller (2) to move close to the winding roller (3) to reduce the distance between the adjustment roller (2) and the winding roller (3), The adjustment distance selection strategy specifically acquires the inkjet position at the critical moment predicted according to the displacement amount, the displacement direction and the preset interval time to define as the predicted position, calculates the inkjet moving distance according to the predicted position and the inkjet range, and obtains the inkjet moving distance by subtracting the preset error from the inkjet moving distance.

7. A multi-head high-speed variable data inkjet printer according to claim 5, wherein: The position of the adjustment roller (2) on the rack (1) is specifically the position of the shaft center of the adjustment roller (2) in the vertical section, the winding roller (3) position is specifically the position of the shaft line of the winding roller (3) in the vertical section, and the vertical section reflects any section perpendicular to the adjustment roller (2).

8. A multi-head high-speed variable data inkjet printer according to claim 1, wherein: The rack (1) is formed with a sliding groove for the adjusting roller (2) to slide, and a distance measuring assembly is arranged on the rack (1), which measures the position of the shaft center of the adjusting roller (2) relative to the starting point of the sliding groove by contact or non-contact principle to obtain the position of the adjusting roller (2) on the rack (1).

9. A multi-head high-speed variable data inkjet printer according to claim 6, wherein: The control system is configured with a verification module (9) which verifies the size of the preset error after the adjusting roller (2) completes the position adjustment, an image acquisition module acquires verification image information, obtains a verification code position in the verification image information, and if the verification code position falls within the inkjet range, the preset error is reduced by a unit value until the distance between the verification code position and the inkjet range is less than a preset distance value.

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