Roller detecting and adjusting device for printing equipment and printing equipment

Abstract

The utility model belongs to the technical field of ink-jet printing, and provides a roller detection and adjustment device for printing equipment and the printing equipment, which solve the problem that the adjustment of the downward pressure of a roller on a printing medium in the prior art is not convenient and accurate enough, and the roller detection and adjustment device comprises a roller used for applying the downward pressure on the printing medium, the nozzle is used for spraying ink of at least one color to a printing medium; the pressure sensing mechanism is used for detecting the pressure value of the downward pressure; and the driving mechanism drives the roller to move according to the pressure value detected by the pressure sensing mechanism, so that the pressure value applied to the printing medium is adjusted to meet the expected pressure value. The roller detecting and adjusting device for the printing equipment and the printing equipment have the advantage of being capable of conveniently and accurately adjusting the downward pressure of the roller on a printing medium.

Description

Technical Field

[0001] The utility model relates to the technical field of inkjet printing, in particular to a roller detection and adjustment device for printing equipment and the printing equipment. Background Art

[0002] Inkjet printing technology refers to the technology of spraying ink droplets onto the printing medium through the nozzles on the printing head of the printing device to obtain printed content with images and / or text. The printing medium is generally a two-dimensional plane. The printing device usually uses four nozzles that spray four different colors of ink, C, M, Y, and K, to perform inkjet printing on the printing medium below. The printing device also uses a power roller to drive the printing medium to move under the nozzle.

[0003] In order to ensure that the print content of multiple nozzles can be matched and printed at the same position on the print medium, the printing device is also provided with an encoder and a roller. The encoder is connected to the roller, and the outer periphery of the roller is in contact with the surface of the print medium. The encoder can calculate the moving distance of the print medium according to the number of rolling circles of the roller and the diameter of the roller.

[0004] To prevent slippage between the roller and the print medium, the roller needs to be in contact with the print medium under a certain downward pressure. The pressure value of the downward pressure cannot be too small, otherwise slippage will occur and the printing accuracy will be affected; nor can it be too large, otherwise the smoothness of the movement of the print medium will be affected. Moreover, for print media of different materials, different friction coefficients between the roller and the print medium produce different friction forces, so the optimal pressure value range of the roller's downward pressure is also different.

[0005] Therefore, after each replacement of the printing medium, in order to ensure that the printing medium moves reliably relative to the nozzle, the debugging personnel need to repeatedly adjust the position of the roller relative to the printing medium basically based on experience to change the downward pressure of the roller on the printing medium, and need to perform multiple printing tests before the adjustment is completed. Therefore, a cumbersome process is required to adjust the downward pressure of the roller on the printing medium, which makes the adjustment very inconvenient. Moreover, the downward pressure obtained by the adjustment cannot be known in time during the adjustment process, which reduces the accuracy of the adjustment and also reduces the printing efficiency.

[0006] Therefore, how to provide a roller detection and adjustment device for a printing device and a printing device that can conveniently and accurately adjust the downward pressure of the roller on the printing medium has become a technical problem that needs to be solved urgently. Utility Model Content

[0007] The present invention aims at the shortcomings of the prior art that the downward pressure exerted by the roller on the printing medium is inconvenient to adjust and cannot be adjusted in a timely and accurate manner. To achieve one purpose of the present invention, a roller detection and adjustment device for a printing device is provided, comprising: a roller, which is used to apply downward pressure to the printing medium, and a nozzle is used to spray at least one color of ink onto the printing medium; a pressure sensing mechanism, which is used to detect the pressure value of the downward pressure; and a driving mechanism, which drives the roller to move according to the pressure value detected by the pressure sensing mechanism, so as to adjust the pressure value exerted on the printing medium to meet the expected pressure value.

[0008] Furthermore, the pressure sensing mechanism includes: a pressure sensor and a controller, the driving mechanism includes a hydraulic mechanism and a push rod, one end of the push rod is connected to the hydraulic mechanism, and a roller is installed on the other end of the push rod, the hydraulic mechanism includes a hydraulic cylinder, the pressure sensor is arranged on the hydraulic cylinder and is used to detect the downward pressure value generated by the push rod due to the action of the hydraulic cylinder, the controller is connected to the hydraulic mechanism, the controller controls the hydraulic mechanism according to the pressure value, and the hydraulic mechanism drives the push rod to move so that the roller moves up and down relatively in a direction perpendicular to the plane where the printing medium is located, thereby adjusting the pressure value.

[0009] Furthermore, the hydraulic mechanism includes a reversing valve, which is connected to the hydraulic cylinder. The reversing valve is used to perform hydraulic reversal on the hydraulic cylinder to achieve upward or downward movement of the push rod. The controller is respectively connected to the pressure sensor and the driving mechanism.

[0010] Furthermore, a rotating roller is passed through the rotating hole of the roller, and the roller rolls on the printing medium under the support of the supporting roller. The pressure sensing mechanism includes a bearing cover, a bearing, an elastomer, a resistance strain gauge, a connector, a shell and a support seat. The bearing is embedded in the inner side of the front section of the elastomer, and the outer ring of the bearing cooperates with the inner side wall of the front section of the elastomer. The inner ring diameter of the bearing is smaller than the inner side wall diameter of the middle section of the elastomer, and the inner ring diameter of the bearing is equal to the outer diameter of the movable roller to be measured. The elastomer and the supporting roller are connected through the bearing, and a bearing cover is installed on the elastomer. A through hole is provided in the middle of the bearing cover, and the diameter of the through hole of the bearing cover is equal to the diameter of the inner ring of the bearing; the shell is nested on the outside of the elastomer, and the resistance strain gauge is covered in the gap between the inner side wall of the shell and the outer side wall of the elastomer. The shell The rear end is connected to the elastic body through a thread, a connector is provided on the outer shell, and the connecting wire of the resistance strain gauge is led out from the connector provided on the outer shell. The support seat is vertically arranged, and the rear end of the elastic body is fixedly connected to the side wall of the support seat, and the central axis of the elastic body is perpendicular to the side wall of the support seat, and the elastic body is connected to the support seat through bolts. The supporting roller and the bearing transmit the downward pressure to the elastic body in the form of reaction force. Two resistance strain gauges are installed on the busbars at 12 o'clock, 3 o'clock, 6 o'clock and 9 o'clock on the elastic body respectively; the four resistance strain gauges on the busbars at 12 o'clock and 6 o'clock directions form a differential full-bridge circuit to measure the bending strain in the vertical direction: the four resistance strain gauges on the busbars at 3 o'clock and 9 o'clock directions form another differential full-bridge circuit to measure the bending strain in the horizontal direction.

[0011] Furthermore, the distance between the two resistance strain gauges on the busbar in each direction is equal, and four of the resistance strain gauges are located on the same circumference, and the other four resistance strain gauges are located on another circumference.

[0012] Furthermore, the pressure sensing mechanism includes a pressure sensor connected to the roller, a driven rod is fixed on the pressure sensor, and the driving mechanism includes a driving motor and a ball screw, the ball screw is connected to the driven rod, and the ball screw drives the driven rod to move under the drive of the motor, thereby synchronously driving the pressure sensor and the roller to make relative up and down movements in a direction perpendicular to the plane where the printing medium is located.

[0013] Further, the pressure sensing mechanism includes a pressure sensor, and the driving mechanism includes a cylinder with a telescopic rod, a vertically arranged bracket, a first slider and a third slider installed oppositely at the upper and lower ends of the side surface of the bracket, a fourth slider and a fifth slider installed oppositely at the left and right ends of the side surface of the bracket, and a second slider that is in the same straight line as the first slider and the third slider and is between the above four sliders; and a first connecting rod, a second connecting rod, a third connecting rod and a fourth connecting rod, each of which has a mounting hole surface at both ends, are used to sequentially connect the fourth slider to the second slider, the second slider to the fifth slider, the fifth slider to the third slider, and the fifth slider to the first slider, and wherein the right end of the first connecting rod The mounting hole surface of the second connecting rod and the mounting hole surface of the left end are kept coaxially matched, and the mounting hole surface of the right end of the second connecting rod, the mounting hole surface of the lower end of the fourth connecting rod, and the mounting hole surface of the upper end of the third connecting rod are kept coaxially matched, thereby jointly forming a rib-type multi-link transmission mechanism; the vertical opposite ends of the second slider are respectively connected to the roller and the pressure sensor, the telescopic rod is drivingly connected to the upper end of the fourth connecting rod, and the cylinder drives the telescopic rod to perform telescopic movement in response to the pressure value detected by the pressure sensor, so that the fourth connecting rod drives the remaining connecting rods to move, and then drives the second slider to move up and down to adjust the upward or downward movement distance of the roller in a direction perpendicular to the plane where the printing medium is located.

[0014] Furthermore, the roller detection and adjustment device includes a fixed frame, a first frame, a second frame, a first slide and a second slide. The first frame is fixed on the fixed frame and is provided with a first slide rail. The first slide slidably cooperates with the first slide rail. The second frame is fixed on the first slide and is provided with a second slide rail. The second slide slidably cooperates with the second slide rail. The pressure sensor and the cylinder are both connected to the second slide. The bracket is connected to the pressure sensor. The first slide and the second slide cooperate with each other to move relative to the first slide and the second slide respectively, so as to be quantitatively adjustable and free to move in the horizontal and vertical directions relative to the printing medium. The roller detection and adjustment device also includes an elastic element and a displacement sensor. The elastic element abuts against the pressure sensor and is used to feedback the reaction force of the printing medium on the roller below in the form of elastic displacement. The displacement sensor is used to obtain the distance between it and the printing medium in the vertical direction in real time.

[0015] Furthermore, the pressure sensor includes a display screen, and the display screen displays the pressure value in real time.

[0016] To achieve another purpose of the utility model, a printing device is provided, including a nozzle and a roller detection and adjustment device, the roller detection and adjustment device is any of the above roller detection and adjustment devices, and the roller drives the printing medium to pass through the nozzle to receive the ink spray.

[0017] The beneficial effects of the utility model are:

[0018] The roller detection and adjustment device of the utility model is provided with a pressure sensing mechanism and a driving mechanism, which not only relies on the pressure sensing mechanism to conveniently obtain the pressure value of the roller's downward pressure on the printing medium, but also utilizes the driving mechanism to adjust the downward pressure according to the pressure value, thereby improving the adjustment accuracy and the printing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the embodiment of the utility model, the drawings required for use in the embodiment of the utility model will be briefly introduced below. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work, and these are all within the protection scope of the utility model.

[0020] Figure 1 A schematic diagram of the structure of a roller detection and adjustment device for a printing device provided in one embodiment of the utility model;

[0021] Figure 2 A schematic structural diagram of a roller detection and adjustment device for a printing device provided by another embodiment of the utility model;

[0022] Figure 3 A schematic structural diagram of a roller detection and adjustment device for a printing device provided by another embodiment of the utility model;

[0023] Figure 4 To correspond to Figure 3 A cross-sectional schematic diagram of;

[0024] Figure 5 A partial structural diagram of a roller detection and adjustment device for a printing device provided in yet another embodiment of the utility model;

[0025] Figure 6 To correspond to Figure 5 Schematic diagram of the overall structure;

[0026] Description of reference numerals:

[0027] 1-roller; 2-pressure sensor; 3-hydraulic cylinder; 4-reversing valve; 5-rod; 6-bearing cover; 7-bearing; 8-elastic body; 9-resistance strain gauge; 10-connector; 11-housing; 12-support seat; 13-support roller; 14-driven rod; 15-motor; 16-ball screw; 17-bracket; 18-first slider; 19-second slider; 20-third slider; 21-fourth slider; 22-fifth slider; 23-first connecting rod; 24-second connecting rod; 25-third connecting rod; 26-fourth connecting rod; 27-first bracket; 28-second bracket; 29-first slide; 30-second slide; 31-elastic element; 32-displacement sensor; 100-printing medium. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the embodiment of the utility model clearer, the technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. It should be noted that, in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. In the description of the utility model, it should be understood that the orientation or position relationship indicated by the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the utility model. Moreover, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element limited by the sentence "includes..." does not exclude the presence of other identical elements in the process, method, article or device including the element. If there is no conflict, the embodiments of the utility model and the various features in the embodiments can be combined with each other, all within the scope of protection of the utility model.

[0029] refer to Figures 1 to 6As an object of the utility model, a roller detection and adjustment device is provided, which includes a roller 1, a pressure sensing mechanism and a driving mechanism. The roller 1 is used to apply downward pressure to the printing medium. The downward pressure applied can make the printing medium pass through the nozzle relatively smoothly and smoothly and receive the ink droplets sprayed by the nozzle. The nozzle is used to spray at least one color of ink to the printing medium. The pressure sensing mechanism is used to detect the pressure value of the downward pressure. The driving mechanism drives the roller 1 to move according to the pressure value detected by the pressure sensing mechanism, so as to adjust the pressure value applied to the printing medium to meet the expected pressure value, which is neither too small to avoid slipping between the roller 1 and the printing medium and affecting the printing accuracy, nor too large to prevent adverse conditions that affect the smoothness of the movement of the printing medium. In addition, it is known that the printing medium also includes a power roller and a guide frame, and the power roller drives the printing medium to move on the guide frame to pass through the nozzle. Therefore, the roller detection and adjustment device provided by the utility model, by setting a pressure sensing mechanism and a driving mechanism, can not only rely on the pressure sensing mechanism to conveniently obtain the pressure value of the downward pressure of the roller 1 on the printing medium, but also utilize the driving mechanism to adjust the downward pressure according to the pressure value, thereby improving the accuracy of the adjustment and also improving the printing efficiency.

[0030] Please refer to Figure 1 Specifically, as a specific embodiment of the roller detection and adjustment device for printing equipment, the pressure sensing mechanism includes: a pressure sensor 2 and a controller, the driving mechanism includes a hydraulic mechanism and a push rod 5, one end of the push rod 5 is connected to the hydraulic mechanism, and the other end of the push rod 5 is installed with a roller 1, the hydraulic mechanism includes a hydraulic oil cylinder 3, the pressure sensor 2 is arranged on the hydraulic oil cylinder 3 and is used to detect the downward pressure value of the push rod 5 due to the action of the hydraulic oil cylinder 3, the controller is connected to the hydraulic mechanism, the controller controls the hydraulic mechanism according to the pressure value, and the hydraulic mechanism drives the push rod 5 to move so that the roller 1 moves up and down relative to the direction perpendicular to the plane where the printing medium is located, thereby adjusting the size of the pressure value. In this embodiment, the roller detection and adjustment device uses a hydraulic method to control the movement of the roller 1 pressing down on the printing medium, which is not only highly accurate, but also convenient for automatic control.

[0031] Preferably, the hydraulic mechanism includes a reversing valve 4, which is connected to the hydraulic cylinder 3. The reversing valve 4 is used to hydraulically reversing the hydraulic cylinder 3, so as to realize the upward or downward movement of the push rod 5. The controller is respectively connected to the pressure sensor 2 and the driving mechanism by wire or wireless means. In this way, by using the reversing valve 4, the switching and distance value of the up and down movement of the roller 1 can be accurately controlled to obtain an accurate desired pressure value.

[0032] Please refer to Figure 2Specifically, as another specific embodiment of the roller detection and adjustment device for a printing device, a support roller 13 is inserted into the rotation hole of the roller 1, and the roller 1 rolls on the printing medium under the support of the support roller 13. The pressure sensing mechanism includes a bearing cover 6, a bearing 7, an elastic body 8, a resistance strain gauge 9, a connector 10, a housing 11 and a support seat 12. The resistance strain gauge 9 is pasted on the outer wall of the middle section of the elastic body 8 to measure the strain of the elastic body 8. The bearing 7 is embedded in the inner side of the front section of the elastic body 8, and the outer ring of the bearing 7 is matched with the inner wall of the front section of the elastic body 8. The inner ring diameter of the bearing 7 is smaller than the inner wall diameter of the middle section of the elastic body 8. The inner ring diameter of the bearing 7 is equal to the outer diameter of the support roller 13. The elastic body 8 and the support roller 13 are connected through the bearing 7, and the external load on the support roller 13 is transmitted to the elastic body 8 through the bearing 7, so that the elastic body 8 is deformed. The elastomer 8 is provided with a bearing cover 6, that is, the bearing cover 6 covers the front end of the elastomer 8 to prevent dust and other impurities from entering the bearing 7. A through hole is provided in the middle of the bearing cover 6, and the diameter of the through hole of the bearing cover 6 is equal to the diameter of the inner ring of the bearing 7. The housing 11 is nested on the outside of the elastomer 8, and the resistance strain gauge 9 is covered in the gap between the inner wall of the housing 11 and the outer wall of the elastomer 8, which plays a role in protecting the connection line and the resistance strain gauge 9. The rear end of the housing 11 is connected to the elastomer 8 through a thread. Preferably, the edge gap between the front end of the housing 11 and the elastomer 8 is filled with silicone to protect the elastomer 8 from erosion by water and oil, etc., and improve durability. In order to facilitate the lead-out of the connection wire of the resistance strain gauge 9, a connector 10 is provided on the housing 11, and the connection wire of the resistance strain gauge 9 is led out by the connector 10 provided on the housing 11. The support seat 12 is vertically arranged, the rear end of the elastomer 8 is fixedly connected to the side wall of the support seat 12, and the central axis of the elastomer 8 is perpendicular to the side wall of the support seat 12. The elastic body 8 is connected to the support seat 12 by bolts. The supporting roller 13 and the bearing 7 transmit the downward pressure to the elastic body 8 in the form of reaction force. Two resistance strain gauges 9 are installed on the busbars in the directions of 12 o'clock, 3 o'clock, 6 o'clock and 9 o'clock on the elastic body 8; among them, four resistance strain gauges 9, namely the first, third, fifth and seventh resistance strain gauges, are evenly distributed on a circumference of the elastic body 8 close to the support seat 12, and the other four resistance strain gauges 9, namely the second, fourth, sixth and eighth resistance strain gauges 9, are evenly distributed on another circumference of the elastic body 8 close to the bearing 7. The first and second resistance strain gauges 9 are located on the busbar in the direction of 12 o'clock of the elastic body 8, and the third and fourth resistance strain gauges 94 are located on the busbar in the direction of 6 o'clock of the elastic body 8. Figure 2 As shown, in Figure 2The two resistance strain gauges 9 located on the relatively upper side are the first and second resistance strain gauges from left to right, and the two resistance strain gauges 9 located on the relatively lower side are the third and fourth resistance strain gauges from left to right. The four resistance strain gauges 9 on the busbars in the 12 o'clock and 6 o'clock directions form a differential full-bridge circuit to measure the bending strain in the vertical direction: the four resistance strain gauges 9 on the busbars in the 3 o'clock and 9 o'clock directions form another differential full-bridge circuit to measure the bending strain in the horizontal direction. Therefore, on the basis of the two strains in the vertical and horizontal directions measured by the resistance strain gauges, the external load is calculated according to Newton's third law and Hooke's theorem, which belongs to the technical knowledge known to those skilled in the art and will not be repeated here, so as to obtain the pressure value of the downward pressure equal to the external load. Therefore, each resistance strain gauge essentially plays the role of a pressure sensing mechanism for detecting the pressure value of the downward pressure. Therefore, the external load of the elastic body 8 is measured by pasting 8 resistance strain gauges 9 on the outer surface of the elastic body 8. Since the pressure values ​​are equal and the reaction force of the downward pressure of the roller 1 acts on the support roller 13, the load is transmitted to the sensor elastic body 8 through the support roller 13 and the bearing 7, so that the elastic body 8 is subjected to a bending deformation caused by a load with the same vector. The external load of the elastic body 8 is measured by the resistance strain gauge 9, and the load on the support roller 13 can be calculated, so as to conveniently and accurately detect the pressure value of the roller 1 pressing down on the printing medium.

[0033] Preferably, the distance between the two resistance strain gauges 9 on the busbar in each direction is equal, and four of the resistance strain gauges 9 are located on the same circumference, and the other four resistance strain gauges 9 are located on another circumference. In this way, the resistance strain gauges 9 are arranged in a circumferentially symmetrical manner, so that the detection result of the pressure value is more accurate.

[0034] Please refer to Figure 3 and Figure 4 Specifically, as another specific embodiment of the roller detection and adjustment device for a printing device, the pressure sensing mechanism includes a pressure sensor 2 connected to the roller 1, a driven rod 14 is fixed on the pressure sensor 2, and the driving mechanism includes a driving motor 15 and a ball screw 16, the ball screw 16 is connected to the driven rod 14, and the ball screw 16 drives the driven rod 14 to move under the drive of the motor 15, thereby synchronously driving the pressure sensor 2 and the roller 1 to move up and down relative to each other in a direction perpendicular to the plane where the printing medium is located. Since the driving displacement of the ball screw 16 has the advantage of high precision, the movement of the pressure sensor 2 and the roller 1 connected thereto has high precision, thereby facilitating accurate detection and adjustment of the above-mentioned pressure value.

[0035] Please refer to Figure 5 and Figure 6Specifically, as another specific embodiment of the roller detection and adjustment device for a printing device, the pressure sensing mechanism includes a pressure sensor 2, and the driving mechanism includes a cylinder with a telescopic rod (not shown), a vertically arranged bracket 17, a first slider 18 and a third slider 20 oppositely mounted at the upper and lower ends of the side of the bracket 17, a fourth slider 21 and a fifth slider 22 oppositely mounted at the left and right ends of the side of the bracket 17, and a second slider 19 that is in the same straight line as the first slider 18 and the third slider 20 and is between the above four sliders; and a first connecting rod 23, a second connecting rod 24, a third connecting rod 25 and a fourth connecting rod 26, each of which has a mounting hole surface at both ends, are used to sequentially connect the fourth slider 21 to the second slider 19, the second slider 19 to the fifth slider 22, the fifth slider 22 to the third slider 20, and the fifth slider 22 to the third slider 20. They are respectively connected to the first slider 18, and the mounting hole surface at the right end of the first connecting rod 23 and the mounting hole surface at the left end of the second connecting rod 24 are kept coaxially matched, and the mounting hole surface at the right end of the second connecting rod 24, the mounting hole surface at the lower end of the fourth connecting rod 26, and the mounting hole surface at the upper end of the third connecting rod 25 are kept coaxially matched, thereby jointly forming a rib-type multi-link transmission mechanism; the vertical opposite ends of the second slider 19 are respectively connected to the roller 1 and the pressure sensor 2, the telescopic rod is drivingly connected to the upper end of the fourth connecting rod 26, and the cylinder drives the telescopic rod to perform telescopic movement in response to the pressure value detected by the pressure sensor 2, so that the fourth connecting rod 26 drives the remaining connecting rods to move, and then drives the second slider 19 to move up and down to adjust the upward or downward movement distance of the roller 1 in a direction perpendicular to the plane where the printing medium 100 is located. In this way, the roller detection and adjustment device embodiment has a multi-link structure, and utilizes the rotation of the fourth link 26 serving as the active rod to drive the slider connected to the roller 1 to move up and down, thereby achieving the technical effect of fine-tuning and precisely adjusting the movement of the second slider 19 brought about by the multi-link structure.

[0036] Please refer to Figure 6Preferably, the roller detection and adjustment device comprises a fixed frame, a first bracket 27, a second bracket 28, a first slide 29 and a second slide 30, the first bracket 27 is fixed on the fixed frame and is provided with a first slide rail, the first slide 29 is slidably matched with the first slide rail, the second bracket 28 is fixed on the first slide 29 and is provided with a second slide rail, the second slide 30 is slidably matched with the second slide rail, the pressure sensor 2 and the cylinder are both connected to the second slide 30, the bracket 17 is connected to the pressure sensor 2, the first slide 29 and the second slide 30 cooperate with each other to move respectively relative to the first slide 29 and the second slide 30, thereby driving the various components on the second slide 30 to move freely in the horizontal direction and the vertical direction relative to the printing medium 100 synchronously and quantitatively adjustable. Therefore, the position of the roller 1 relative to the printing medium 100 can be preliminarily adjusted to adapt to printing media 100 of different widths or / and different thicknesses. The roller detection and adjustment device also includes an elastic element 31 and a displacement sensor 32. The elastic element 31 is in contact with the pressure sensor 2 and is used to feed back the reaction force of the printing medium 100 on the roller 1 below in the form of elastic displacement. Therefore, the synchronization and reliability of the adjustment of the position of the pressure sensor 2 relative to the position of the roller 1 are high. The displacement sensor 32 is used to obtain the vertical distance between it and the printing medium 100 in real time. Therefore, by setting the displacement sensor 32, it is more conducive to initially and more accurately adjust the position of the roller 1 for printing media 100 of different thicknesses.

[0037] Preferably, for each of the above roller detection and adjustment device embodiments, the pressure sensor 2 includes a display screen, and the display screen displays the pressure value in real time. In this way, the pressure value can be grasped in real time, so that the pressure value of the downward pressure can be adjusted visually and quickly, and abnormal conditions in the movement process of the printing medium can be discovered in time.

[0038] As another object of the utility model, the utility model further provides a printing device, which includes a nozzle and a roller detection and adjustment device, the roller detection and adjustment device is any of the above embodiments of the roller detection and adjustment device, the printing device can obtain the beneficial effects brought by any of the embodiments of the roller detection and adjustment device, which will not be described in detail here. Therefore, the printing device has the advantage of being able to conveniently and accurately adjust the downward pressure of the roller on the printing medium.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A roller detection and adjustment device for a printing device, characterized in that: include: A roller for applying downward pressure to a printing medium, and a nozzle of the printing device for spraying ink of at least one color onto the printing medium; A pressure sensing mechanism, which is used to detect the pressure value of the downward force; A driving mechanism drives the roller to move according to the pressure value detected by the pressure sensing mechanism, thereby adjusting the pressure value applied to the printing medium to meet the expected pressure value.

2. The roller detection and adjustment device according to claim 1, characterized in that: The pressure sensing mechanism includes: a pressure sensor and a controller, the driving mechanism includes a hydraulic mechanism and a push rod, one end of the push rod is connected to the hydraulic mechanism, and the other end of the push rod is installed with the roller, the hydraulic mechanism includes a hydraulic cylinder, the pressure sensor is arranged on the hydraulic cylinder and is used to detect the downward pressure value of the push rod generated by the action of the hydraulic cylinder, the controller is connected to the hydraulic mechanism, and the controller controls the hydraulic mechanism according to the pressure value, and the hydraulic mechanism drives the push rod to move so that the roller moves up and down relatively in a direction perpendicular to the plane where the printing medium is located, thereby adjusting the size of the pressure value.

3. The roller detection and adjustment device according to claim 2, characterized in that: The hydraulic mechanism includes a reversing valve, which is connected to the hydraulic cylinder. The reversing valve is used to perform hydraulic reversal on the hydraulic cylinder, thereby realizing the upward or downward movement of the push rod. The controller is respectively connected to the pressure sensor and the driving mechanism.

4. The roller detection and adjustment device according to claim 3, characterized in that: A rotating roller is inserted into the rotating hole of the roller, and the roller rolls on the printing medium under the support of the supporting roller. The pressure sensing mechanism includes a bearing cover, a bearing, an elastomer, a resistance strain gauge, a connector, a shell and a support seat. The bearing is embedded in the inner side of the front section of the elastomer, and the outer ring of the bearing cooperates with the inner side wall of the front section of the elastomer. The inner ring diameter of the bearing is smaller than the inner side wall diameter of the middle section of the elastomer. The inner ring diameter of the bearing is equal to the outer diameter of the moving roller to be measured. The elastomer and the supporting roller are connected through the bearing, and a bearing cover is installed on the elastomer. A through hole is provided in the middle of the bearing cover, and the diameter of the through hole of the bearing cover is equal to the diameter of the inner ring of the bearing; the shell is nested on the outside of the elastomer, and the resistance strain gauge is covered in the gap between the inner side wall of the shell and the outer side wall of the elastomer. The rear end of the shell is connected to the elastomer through a thread. A connector is provided on the shell, and the connecting wire of the resistance strain gauge is led out from the connector provided on the shell. The support seat is vertically arranged, and the rear end of the elastic body is fixedly connected to the side wall of the support seat, and the central axis of the elastic body is perpendicular to the side wall of the support seat, and the elastic body is connected to the support seat by bolts. The supporting roller and the bearing transmit the downward pressure to the elastic body in the form of reaction force. Two resistance strain gauges are installed on the busbars at 12 o'clock, 3 o'clock, 6 o'clock and 9 o'clock on the elastic body respectively; the four resistance strain gauges on the busbars at 12 o'clock and 6 o'clock directions form a differential full-bridge circuit to measure the bending strain in the vertical direction: the four resistance strain gauges on the busbars at 3 o'clock and 9 o'clock directions form another differential full-bridge circuit to measure the bending strain in the horizontal direction.

5. The roller detection and adjustment device according to claim 4, characterized in that: The distances between the two resistance strain gauges on the busbar in each direction are equal, and four of the resistance strain gauges are located on the same circumference, and the other four resistance strain gauges are located on another circumference.

6. The roller detection and adjustment device according to claim 1, characterized in that: The pressure sensing mechanism includes a pressure sensor connected to the roller, a driven rod is fixed on the pressure sensor, and the driving mechanism includes a driving motor and a ball screw, the ball screw is connected to the driven rod, and the ball screw drives the driven rod to move under the drive of the motor, thereby synchronously driving the pressure sensor and the roller to make relative up and down movements in a direction perpendicular to the plane where the printing medium is located.

7. The roller detection and adjustment device according to claim 1, characterized in that: The pressure sensing mechanism includes a pressure sensor, the driving mechanism includes a cylinder with a telescopic rod, a vertically arranged bracket, a first slider and a third slider installed oppositely at the upper and lower ends of the side of the bracket, a fourth slider and a fifth slider installed oppositely at the left and right ends of the side of the bracket, and a second slider that is in the same straight line as the first slider and the third slider and is between the above four sliders; and a first connecting rod, a second connecting rod, a third connecting rod and a fourth connecting rod, each of which has a mounting hole surface at both ends, are used to sequentially connect the fourth slider with the second slider, the second slider with the fifth slider, the fifth slider with the third slider, and the fifth slider with the first slider, and wherein the right end of the first connecting rod The mounting hole surface of the second connecting rod and the mounting hole surface of the left end are kept coaxially matched, and the mounting hole surface of the right end of the second connecting rod and the mounting hole surface of the lower end of the fourth connecting rod and the mounting hole surface of the upper end of the third connecting rod are kept coaxially matched, thereby jointly forming a rib-type multi-link transmission mechanism; the vertical opposite ends of the second sliding block are respectively connected to the roller and the pressure sensor, the telescopic rod is drivingly connected to the upper end of the fourth connecting rod, and the cylinder drives the telescopic rod to perform telescopic movement in response to the pressure value detected by the pressure sensor, so that the fourth connecting rod drives the remaining connecting rods to move, and then drives the second sliding block to move up and down to adjust the upward or downward movement distance of the roller in a direction perpendicular to the plane where the printing medium is located.

8. The roller detection and adjustment device according to claim 7, characterized in that: The roller detection and adjustment device includes a fixed frame, a first bracket, a second bracket, a first slide and a second slide, the first bracket is fixed on the fixed frame and is provided with a first slide rail, the first slide is slidably matched with the first slide rail, the second bracket is fixed on the first slide rail and is provided with a second slide rail, the second slide is slidably matched with the second slide rail, the pressure sensor and the cylinder are both connected to the second slide, the bracket is connected to the pressure sensor, the first slide and the second slide cooperate with each other to move relative to the first slide and the second slide respectively, so as to be quantitatively adjustable and free to move in the horizontal direction and the vertical direction relative to the printing medium; the roller detection and adjustment device also includes an elastic element and a displacement sensor, the elastic element abuts against the pressure sensor and is used to feedback the reaction force of the printing medium on the roller below in the form of elastic displacement, and the displacement sensor is used to obtain the distance between it and the printing medium in the vertical direction in real time.

9. The roller detection and adjustment device according to any one of claims 2 to 8, characterized in that: The pressure sensor comprises a display screen, and the display screen displays the pressure value in real time.

10. A printing device, characterized in that It comprises a nozzle and a roller detection and adjustment device, wherein the roller detection and adjustment device is the roller detection and adjustment device according to any one of claims 1 to 9, and the roller drives the printing medium to pass through the nozzle to receive the ink jet.

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