Roller structure of a printer

Abstract

The application provides a roller pressing structure of a printer, which is used for improving the feeding efficiency of the roller pressing structure. A first transmission gear is installed on a host driven roller, and a second transmission gear is installed on a platen roller. A host driving component drives the host driven roller to rotate through a host conveying belt. The host driven roller drives the platen roller to rotate through the first transmission gear and the second transmission gear. The transmission ratio of the first transmission gear and the second transmission gear is determined according to the radii of the host driven roller and the platen roller, so that the linear speed of the platen roller is the same as the speed of the host conveying belt. Compared with the prior art, the platen roller does not need to be driven by the print substrate, and the platen roller can drive the print substrate to move. If the leading corner of the print substrate is lifted, when the lifted part contacts the platen roller, the platen roller can drive the lifted part to move to the platen gap between the platen roller and the host conveying belt, so that the print substrate with the lifted part can be successfully fed.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the field of printers, and in particular to a roller pressing structure of a printer. BACKGROUND

[0002] At present, a digital printer usually adopts a conveying belt to convey, and a printing object moves continuously on the conveying belt, and a printing unit is fixed to print. The printing characteristic of a nozzle of the printing unit determines that when high-speed and high-precision printing is performed, the gap allowed for the printing object to pass between the nozzle and the conveying belt is very small (generally 0.5-3 mm), so the flatness of the printing object is required to be high. When the printing object is a flat material, due to transportation, handling, storage and the characteristics of the material itself, etc., deformation often exists. In actual production, a roller pressing structure is needed to be added to flatten the deformation of the material.

[0003] In the roller pressing structure of the prior art, the printing object moves continuously on the conveying belt, and pressure and friction force are generated between the printing object and a paper pressing roller. The paper pressing roller rotates with the movement of the printing object under the action of the friction force.

[0004] Since the paper pressing roller rotates with the movement of the printing object, when feeding, if the leading edge corner of the printing object is raised, the raised part is difficult to enter the paper pressing gap between the paper pressing roller and the main machine conveying belt when the raised part contacts the paper pressing roller, and feeding failure is prone to occur. SUMMARY

[0005] Embodiments of the present application provide a roller pressing structure of a printer, which is used to improve the feeding efficiency of the roller pressing structure.

[0006] A first aspect of embodiments of the present application provides a roller pressing structure of a printer, comprising: a main machine driving component, a main machine conveying belt, a main machine driven roller, a first transmission gear, a second transmission gear and a paper pressing roller;

[0007] The first transmission gear is installed on the main machine driven roller, and the second transmission gear is installed on the paper pressing roller;

[0008] The main machine driving component drives the main machine driven roller to rotate through the main machine conveying belt, and the main machine driven roller drives the paper pressing roller to rotate through the first transmission gear and the second transmission gear which are in mesh with each other; wherein the transmission ratio of the first transmission gear and the second transmission gear is determined according to the radii of the main machine driven roller and the paper pressing roller, so that the linear speed of the paper pressing roller is the same as the speed of the main machine conveying belt.

[0009] Based on the first aspect of the embodiments of the present application, in a first implementation manner of the first aspect of the embodiments of the present application, a frame beam, an adjusting connecting rod, an adjusting gear and an eccentric gear are further included; the adjusting gear comprises a first adjusting gear and a second adjusting gear, and the eccentric gear comprises a first eccentric gear and a second eccentric gear;

[0010] The adjusting connecting rod is fixedly installed with a first adjusting gear and a second adjusting gear at two ends thereof respectively, the paper pressing roller is rotatably installed with a first eccentric gear and a second eccentric gear at two ends thereof respectively, the first adjusting gear meshes with the first eccentric gear, and the second adjusting gear meshes with the second eccentric gear.

[0011] According to the first aspect or the first implementation manner of the first aspect of the embodiment of the present application, in the second implementation manner of the first aspect of the embodiment of the present application, the adjusting motor is further included.

[0012] The output end of the adjusting motor is connected with the first adjusting gear.

[0013] According to any one of the first aspect, the first implementation manner and the second implementation manner of the first aspect of the embodiment of the present application, in the third implementation manner of the first aspect of the embodiment of the present application, the sliding block is further included.

[0014] The sliding block is in a cylindrical shape, the sliding block is matched with the first circular hole of the frame beam, and the sliding block is rotatably connected with the frame beam; the sliding block is provided with a second circular hole, the sliding block is fixedly connected with the eccentric gear, and the eccentric gear is rotatably connected with the frame beam through the sliding block.

[0015] According to any one of the first aspect, the first implementation manner to the third implementation manner of the first aspect of the embodiment of the present application, in the fourth implementation manner of the first aspect of the embodiment of the present application, the flange plate is further included, and the outer diameter of the flange plate is greater than the diameter of the first circular hole of the frame beam.

[0016] The sliding block is provided with a shaft shoulder at a position close to the eccentric gear, and the bottom surface of the sliding block away from the eccentric gear is connected with the flange plate.

[0017] The shaft shoulder and the flange plate are used to limit the axial position of the sliding block in the first circular hole of the frame beam.

[0018] According to any one of the first aspect, the first implementation manner to the fourth implementation manner of the first aspect of the embodiment of the present application, in the fifth implementation manner of the first aspect of the embodiment of the present application, the two ends of the adjusting connecting rod are fixedly installed with the first adjusting gear and the second adjusting gear through the expansion sleeve respectively.

[0019] According to any one of the first aspect, the first implementation manner to the fifth implementation manner of the first aspect of the embodiment of the present application, in the sixth implementation manner of the first aspect of the embodiment of the present application, the two ends of the paper pressing roller are rotatably installed with the first eccentric gear and the second eccentric gear through the bearing respectively.

[0020] According to any one of the first aspect, the first implementation manner to the sixth implementation manner of the first aspect of the embodiment of the present application, in the seventh implementation manner of the first aspect of the embodiment of the present application, the universal coupling is further included.

[0021] The second transmission gear and the platen roller are connected through a universal joint, a power input end of the universal joint is connected with the second transmission gear, and a power output end of the universal joint is connected with the platen roller.

[0022] According to any one of the first aspect, the first implementation manner to the seventh implementation manner of the first aspect of the embodiment of the present application, in the eighth implementation manner of the first aspect of the embodiment of the present application, the universal joint is a cross slider joint.

[0023] The cross slider joint comprises a first eccentric block, a cross slider and a second eccentric block, and the first eccentric block and the second eccentric block are slidably connected through the cross slider.

[0024] The first eccentric block is fixedly connected with the second transmission gear through an expansion sleeve, and the second eccentric block is fixedly connected with the platen roller through the expansion sleeve.

[0025] According to any one of the first aspect, the first implementation manner to the eighth implementation manner of the first aspect of the embodiment of the present application, in the ninth implementation manner of the first aspect of the embodiment of the present application, further comprising a host computer adsorption component.

[0026] The host computer conveying belt is provided with a plurality of adsorption holes, and the host computer adsorption component reduces the air pressure on the side of the host computer conveying belt away from the printing substrate, so that the printing substrate is adsorbed on the surface of the host computer conveying belt by the adsorption holes.

[0027] From the above technical solution, the embodiment of the present application has the following advantages:

[0028] In the embodiment of the present application, the power output by the host computer driving component is transmitted in sequence through the host computer conveying belt, the host computer driven roller, the first transmission gear and the second transmission gear, and reaches the platen roller. Compared with the prior art, the platen roller does not need to be driven by the printing substrate, and the platen roller can actively drive the printing substrate to move. If there is a raised part on the leading edge corner of the printing substrate, when the raised part contacts the platen roller, the platen roller can drive the raised part to move to the platen gap between the platen roller and the host computer conveying belt, so that the printing substrate with the raised part can be successfully fed.

[0029] The transmission ratio of the first transmission gear and the second transmission gear is determined according to the radii of the host computer driven roller and the platen roller, so that the linear speed of the platen roller is the same as the speed of the host computer conveying belt. When the platen roller is pressed, the platen roller and the printing substrate are in rolling friction rather than sliding friction, so as to avoid the printing substrate from slipping, wearing and deviating due to the different speeds of the upper and lower surfaces. By using the first transmission gear and the second transmission gear, the transmission is accurate, and even if the speed of the host computer conveying belt changes due to load changes, the speed of the host computer conveying belt and the platen roller can still remain the same. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a working state schematic diagram of the platen structure of the printer of the embodiment of the present application;

[0031] Figure 2 is a sectional view of the roller structure of the printer of the embodiment of the present application;

[0032] Figure 3 is a partial enlarged view of Figure 2 ;

[0033] Figure 4 is a perspective view of the roller structure of the embodiment of the present application;

[0034] Figure 5 is a partial enlarged view of Figure 4 ;

[0035] Figure 6 is a partial sectional view of the roller structure of the embodiment of the present application;

[0036] Figure 7 is a partial perspective view of the roller structure of the embodiment of the present application;

[0037] Figure 8 is a schematic view of various states of the eccentric gear of the embodiment of the present application;

[0038] Reference signs:

[0039] A: print substrate;

[0040] B: print host paper feeding structure; B-1: host driven roller; B-2: first transmission gear; B-3: host conveying belt;

[0041] C: roller structure; C-1: platen roller; C-2: second transmission gear; C-3: fixed side plate; C-4: frame beam; C-5: adjusting connecting rod; C-6: adjusting gear; C-7: first expansion sleeve; C-8: eccentric gear; C-9: fixed column; C-10: gear fixing plate; C-11: gear shaft; C-12: bearing; C-13: cross slide coupling; C-13-1: first eccentric block; C-13-2: cross slide; C-13-3: second eccentric block; C-14: bearing; C-15: bearing limiting block; C-16: sliding block; C-17: sliding flange; C-18: second expansion sleeve; C-19: third expansion sleeve; C-20: check ring; C-21: speed reducer connecting plate; C-22: speed reducer; C-23: adjusting motor. DETAILED DESCRIPTION

[0042] The terms "first", "second", "third", "fourth", and the like in the description and in the claims of the present application and in the above-described drawings mean for distinguishing similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the use of data herein is not per se a limitation on the scope of the embodiments described herein. Embodiments described herein can be practiced in locations other than those illustrated or described herein. Furthermore, the terms "comprise", "have", and any variations thereof are intended to cover a non-exclusive inclusion, for example, a process, method, article, or apparatus that comprises a list of steps or units not necessarily limited to those specifically listed, but can include additional steps or units not expressly listed or inherent to such process, method, article, or apparatus.

[0043] When printing on flat materials such as corrugated paper using a printer, especially when printing using a OnePass digital printer, the flat material needs to be pressed flat. The pressing flat requires the use of a roller pressing structure of the printer. The existing roller pressing structure has many problems and needs to be improved, for example: since the pressing roller C-1 rotates with the movement of the printing material A, when feeding, if the leading edge corner of the printing material A is raised, the raised part will be difficult to enter the pressing gap between the pressing roller C-1 and the main machine conveying belt B-3 when it contacts the pressing roller C-1, and feeding failure is likely to occur; since the pressing roller C-1 rotates with the movement of the printing material A, when pressing, slippage, wear and deviation are likely to occur between the printing material A and the pressing roller C-1. The printing material A can be paper or the like. The roller pressing structure can also be referred to as a pressing structure.

[0044] As shown in Figures 1 to 3 , the roller pressing structure includes a printing main machine paper feeding structure B and a roller structure C, and the roller structure C is installed on the printing main machine paper feeding structure B. When the printer is printing, the printing material A passes through the pressing gap L between the roller structure C and the printing main machine paper feeding structure B. The roller structure C and the printing main machine paper feeding structure B move with the printing material A sandwiched therebetween, thereby achieving the purpose of pressing the printing material A flat. In order to adapt to the material properties of different printing materials A, pressing rollers C-1 of different sizes, hardness and density can be used.

[0045] As shown in Figures 1 to 8 , the present application provides a roller pressing structure of a printer, which comprises a main machine driving component, a main machine conveying belt B-3, a main machine driven roller B-1, a first transmission gear B-2, a second transmission gear C-2 and a pressing roller C-1.

[0046] The first transmission gear B-2 is installed on the main machine driven roller B-1, and the second transmission gear C-2 is installed on the platen roller C-1. The first transmission gear B-2 is installed on one end of the main machine driven roller B-1, and the second transmission gear C-2 is installed on one end of the platen roller C-1; or the first transmission gear B-2 is installed on both ends of the main machine driven roller B-1, and the second transmission gear C-2 is installed on both ends of the platen roller C-1. The main machine driving component includes a main machine motor and a main machine driving roller, and the main machine motor drives the main machine driving roller to rotate. The main machine transmission belt B-3 passes around the main machine driving roller and the main machine driven roller B-1, and the main machine driving roller and the main machine driven roller B-1 tension the main machine transmission belt B-3.

[0047] The main machine driving component drives the main machine driven roller B-1 to rotate through the main machine transmission belt B-3, and the main machine driven roller B-1 drives the platen roller C-1 to rotate through the first transmission gear B-2 and the second transmission gear C-2. The transmission ratio of the first transmission gear B-2 and the second transmission gear C-2 is determined according to the radii of the main machine driven roller B-1 and the platen roller C-1, so that the linear speed of the platen roller C-1 is the same as the speed of the main machine transmission belt B-3. The main machine driving roller of the main machine driving component drives the main machine transmission belt B-3 to move, and the main machine transmission belt B-3 drives the main machine driven roller B-1 to rotate. The main machine driven roller B-1 drives the first transmission gear B-2 to rotate. The first transmission gear B-2 drives the second transmission gear C-2 to rotate. The second transmission gear C-2 drives the platen roller C-1 to rotate. The transmission ratio of the first transmission gear B-2 and the second transmission gear C-2 is equal to the ratio of the radius of the platen roller C-1 to the sum of the radius of the main machine driven roller B-1 and the thickness of the main machine transmission belt B-3, that is, the transmission ratio of the first transmission gear B-2 and the second transmission gear C-2 = the number of teeth of the second transmission gear C-2 : the number of teeth of the first transmission gear B-2 = the radius of the platen roller C-1 : (the radius of the main machine driven roller B-1 + the thickness of the main machine transmission belt B-3). When the thickness of the main machine transmission belt B-3 can be ignored, the transmission ratio of the first transmission gear B-2 and the second transmission gear C-2 is equal to the ratio of the radius of the platen roller C-1 to the radius of the main machine driven roller B-1, that is, the transmission ratio of the first transmission gear B-2 and the second transmission gear C-2 = the number of teeth of the second transmission gear C-2 : the number of teeth of the first transmission gear B-2 = the radius of the platen roller C-1 : the radius of the main machine driven roller B-1.

[0048] In this embodiment, the power output from the main drive component is sequentially transmitted through the main drive conveyor belt B-3, the main drive driven roller B-1, the first transmission gear B-2, and the second transmission gear C-2, reaching the pressure roller C-1. Compared with the prior art, the pressure roller C-1 does not require the substrate A to drive it; the pressure roller C-1 can actively drive the substrate A to move. If the leading edge corner of the substrate A is raised, and the raised part contacts the pressure roller C-1, the pressure roller C-1 can drive the raised part to move into the pressure gap between the pressure roller C-1 and the main drive conveyor belt B-3, so that the raised substrate A can be successfully fed.

[0049] The transmission ratio of the first transmission gear B-2 and the second transmission gear C-2 is determined based on the radii of the driven roller B-1 and the pressure roller C-1 of the main machine. This ensures that the linear velocity of the pressure roller C-1 is the same as the speed of the main machine conveyor belt B-3. During rolling, the pressure roller C-1 and the substrate A experience rolling friction rather than sliding friction, preventing slippage, wear, and misalignment of the substrate A due to differences in speed between its upper and lower surfaces. Using the first transmission gear B-2 and the second transmission gear C-2 ensures precise transmission; even if the speed of the main machine conveyor belt B-3 changes due to load variations, the speed of the main machine conveyor belt B-3 and the pressure roller C-1 remain the same.

[0050] The pressure roller C-1 and the main conveyor belt B-3 share the same power source—the main drive unit—which saves costs and simplifies the structure. A rigid transmission is used between the driven roller B-1 and the pressure roller C-1, resulting in higher synchronization accuracy between the linear speed of the pressure roller C-1 and the belt speed. This is more reliable than a solution using an independent power source for the pressure roller C-1, and can adapt to speed variations in the main conveyor belt B-3, ensuring that the linear speed of the pressure roller C-1 and the main conveyor belt B-3 are always consistent.

[0051] The first drive gear B-2 can also be called the lower drive gear; the second drive gear C-2 can also be called the upper drive gear. The main unit conveyor belt B-3 can also be called the main unit annular belt, or simply a belt. The roller structure C can also be called the pressure paper structure. The printing main unit paper feeding structure B can also be called the main unit conveyor platform.

[0052] like Figure 4 As shown, in one implementation of this application embodiment, the printer's roller pressing structure further includes a frame beam C-4, an adjusting rod C-5, an adjusting gear C-6, and an eccentric gear C-8. The adjusting gear C-6 includes a first adjusting gear and a second adjusting gear, and the eccentric gear C-8 includes a first eccentric gear and a second eccentric gear. The frame beam C-4 is used to mount the pressure roller C-1 and its power mechanism and adjusting mechanism. The power mechanism includes, for example, a second transmission gear C-2, and the adjusting mechanism includes, for example, the adjusting rod C-5, the adjusting gear C-6, and the eccentric gear C-8.

[0053] likeFigure 8 As shown, the center O of the pitch circle of the eccentric gear C-8 does not coincide with the center P of the eccentric hole used to mount the platen roller C-1. The eccentricity of the eccentric gear C-8 is |OP|. Figure 8 As shown, the center O of the pitch circle of the eccentric gear C-8 does not coincide with the center P of the eccentric hole used to mount the platen roller C-1. The eccentricity of the eccentric gear C-8 is |OP|.

[0054] The adjusting link C-5 is parallelly mounted with the platen roller C-1 on the frame beam C-4, and the two ends of the adjusting link C-5 are fixedly mounted with the first adjusting gear and the second adjusting gear respectively. The two ends of the platen roller C-1 are rotatably mounted with the first eccentric gear and the second eccentric gear respectively, and the first adjusting gear and the first eccentric gear are engaged, and the second adjusting gear and the second eccentric gear are engaged. The frame beam C-4 is provided with a first circular hole for mounting the adjusting link C-5 and the platen roller C-1, and the adjusting link C-5 and the platen roller C-1 are parallel to each other. The adjusting link C-5 and the adjusting gear C-6 are fixedly connected to rotate synchronously. The platen roller C-1 and the eccentric gear C-8 are rotatably connected, and the platen roller C-1 is driven to rotate by the second transmission gear C-2 and will not cause the rotation of the eccentric gear C-8. The eccentric gear C-8 rotates around the center O of the pitch circle, which causes the center P of the eccentric hole to rotate around the center O and produce displacement, so that the platen roller C-1 rotates around the center O with the eccentric hole and produces displacement. In the case that the center O of the pitch circle of the eccentric gear C-8 remains stationary relative to the driven roller B-1 of the main machine, the platen roller C-1 produces displacement relative to the driven roller B-1 of the main machine with the rotation of the eccentric gear C-8, changes the distance between the platen roller C-1 and the driven roller B-1 of the main machine, and also changes the paper pressing gap L between the platen roller C-1 and the main conveying belt B-3. The adjustment range of the paper pressing gap L is 2 times the eccentricity |OP| of the eccentric gear C-8, that is, the adjustment range = 2|OP|. Since the rotation angle of the eccentric gear C-8 can be adjusted arbitrarily, the adjustment of the paper pressing gap L can be stepless, and a variety of thicknesses of the printing substrate A can be used. When printing the printing substrate A with different thicknesses, the paper pressing gap L can be quickly and flexibly adjusted, the adjustment efficiency is high, and the adjustment effect is good.

[0055] As Figure 6 shown, in an implementation manner of the embodiment of the present application, the roller pressing structure of the printer further includes an adjusting motor C-23.

[0056] The output of the adjusting motor C-23 is connected to the first adjusting gear. The output of the adjusting motor C-23 can be directly connected to the first adjusting gear, or it can be connected to the first adjusting gear via the reducer C-22. The adjusting motor C-23 can be installed at either end of the pressure roller C-1, but installing it at the end furthest from the second transmission gear C-2 is more convenient and avoids interference between the adjusting motor C-23 and the second transmission gear C-2.

[0057] The use of the C-23 regulating motor enables precise digital automatic control that is stable and reliable.

[0058] like Figure 5 As shown in one implementation of this application embodiment, the printer's roller pressing structure further includes a sliding block C-16.

[0059] The sliding block C-16 is cylindrical and matches the first circular hole of the frame beam C-4, allowing for rotatable connection. The sliding block C-16 also has a second circular hole, which is fixedly connected to the eccentric gear C-8. The eccentric gear C-8 is rotatably connected to the frame beam C-4 via the sliding block C-16. The sliding block C-16 and the eccentric gear C-8 can be fixedly connected via gears. The pressure roller C-1 passes through the second circular hole and connects to the eccentric gear C-8. To prevent interference between the pressure roller C-1 and the sliding block C-16 when the eccentric gear C-8 rotates, the radius of the second circular hole should be greater than the sum of the eccentricity of the eccentric gear C-8 (|OP|) and the radius of the pressure roller C-1 at the second circular hole; that is, the radius of the second circular hole > |OP| + the radius of the pressure roller C-1 at the second circular hole. The center of the first circular hole, the center of the pitch circle O of the eccentric gear C-8, and the center of the second circular hole coincide.

[0060] In one implementation of this application, the printer's roller pressing structure further includes a flange C-17, the outer diameter of which is larger than the diameter of the first circular hole in the frame beam C-4.

[0061] A shoulder is provided on the sliding block C-16 near the eccentric gear C-8. The bottom surface of the sliding block C-16, away from the eccentric gear C-8, is connected to the flange C-17. A shoulder is provided at one end of the sliding block C-16, and the diameter of the shoulder is larger than the diameter of the first circular hole in the frame beam C-4. The length of the shoulder in the axial direction should be greater than a preset value to avoid friction between the eccentric gear C-8 and the frame beam C-4. The flange C-17 and the sliding block C-16 can be fixedly connected by bolts. A certain gap may exist between the bottom surface of the sliding block C-16 away from the eccentric gear C-8 and the flange C-17, or they may be in close contact. The flange C-17 can also be referred to as a sliding flange.

[0062] The shaft shoulder and the flange C-17 are used to limit the axial position of the sliding block C-16 in the first circular hole of the frame beam C-4. The flange C-17 is installed on the side of the sliding block C-16 away from the shaft shoulder, and the shaft shoulder and the flange C-17 can prevent the axial movement of the sliding block C-16 along the first circular hole in the frame beam C-4, thereby ensuring the stability of the structure.

[0063] In an implementation manner of the embodiment of the present application, the two ends of the adjusting connecting rod C-5 are respectively fixedly installed with the first adjusting gear and the second adjusting gear through the first expansion sleeve C-7. The first expansion sleeve C-7 can be used to conveniently fix and connect the adjusting connecting rod C-5 and the adjusting gear C-6. The inner ring of the first expansion sleeve C-7 is sleeved on the adjusting connecting rod C-5, and the outer ring of the first expansion sleeve C-7 is tightly attached to the inner hole of the adjusting gear C-6. It should be noted that the adjusting connecting rod C-5 and the adjusting gear C-6 can also be connected through a key connection or other connection modes.

[0064] In an implementation manner of the embodiment of the present application, the two ends of the platen roller C-1 are respectively installed with the first eccentric gear and the second eccentric gear through the bearing C-14. The inner ring of the bearing C-14 is sleeved on the platen roller C-1, and the outer ring of the bearing C-14 is embedded in the eccentric hole of the eccentric gear C-8. The bearing C-14 can be a rolling bearing.

[0065] In an implementation manner of the embodiment of the present application, the roller pressing structure of the printer further includes a universal coupling. The universal coupling can be a cross shaft type, a ball cage type, a ball fork type, a protrusion type, a ball pin type, a ball hinge type, a ball hinge plunger type, a three-pin type, a three-pronged rod type, a three-ball pin type, a hinge rod type, and the like.

[0066] The second transmission gear C-2 and the platen roller C-1 are connected through the universal coupling. The power input end of the universal coupling is connected to the second transmission gear C-2, and the power output end of the universal coupling is connected to the platen roller C-1. The use of the universal coupling enables the platen roller C-1 to move relative to the second transmission gear C-2, while the power can still be transmitted from the second transmission gear C-2 to the platen roller C-1, which facilitates the adjustment of the positional relationship between the platen roller C-1 and the host driven roller B-1, and further adjusts the paper pressing gap.

[0067] In an implementation manner of the embodiment of the present application, the universal coupling is a cross slider coupling C-13.

[0068] The cross slider coupling C-13 includes a first eccentric block C-13-1, a cross slider C-13-2, and a second eccentric block C-13-3. The first eccentric block C-13-1 and the second eccentric block C-13-3 are slidably connected through the cross slider C-13-2.

[0069] The first eccentric block C-13-1 is fixedly connected with the second transmission gear C-2 through the second expansion sleeve C-18, and the second eccentric block C-13-3 is fixedly connected with the platen roller C-1 through the third expansion sleeve C-19. The expansion sleeve is used to conveniently connect the cross slider coupling C-13, the second transmission gear C-2 and the platen roller C-1. The cross slider coupling C-13 is used to enable the second transmission gear C-2 and the platen roller C-1 to transmit power in the case of different shafts, thereby improving the flexibility of the platen roller C-1.

[0070] In an implementation manner of the embodiment of the application, the frame beam C-4 is fixedly provided with a gear fixing plate C-10. The gear fixing plate C-10 can be arranged on the frame beam C-4 through a plurality of fixing columns C-9.

[0071] The second transmission gear C-2 is mounted on the gear fixing plate C-10 through a bearing C-12. The second transmission gear C-2 can only perform a rotating motion relative to the frame beam C-4 and cannot be displaced. The gear fixing plate C-10 is arranged to improve the stability of the structure.

[0072] The frame beam C-4 is provided with a speed reducer connecting plate C-21 for mounting a speed reducer C-22.

[0073] In an implementation manner of the embodiment of the application, the roller pressing structure of the printer further comprises a host suction component. The host suction component comprises a vacuum pump for sucking air to form low pressure.

[0074] The host conveying belt B-3 is provided with a plurality of suction holes, and the host suction component reduces the air pressure on the side of the host conveying belt B-3 away from the printing substrate A, so that the printing substrate A is adsorbed on the surface of the host conveying belt B-3 by the suction holes. Under the action of the host suction component, the air flow at the suction holes flows from the side of the host conveying belt B-3 close to the printing substrate A to the side away from the printing substrate A. The suction holes can be densely and uniformly distributed to stably adsorb the printing substrate A, so that the printing substrate A can be laid flat on the surface of the host conveying belt B-3.

[0075] In order to better understand the roller pressing structure of the printer of the embodiment of the application, the working process of the roller pressing structure is described below.

[0076] The movement of the host conveying belt B-3 drives the host driven roller B-1 and the first transmission gear B-2 to rotate, and the first transmission gear B-2 is engaged with the second transmission gear C-2, so that the second transmission gear C-2 moves in the same linear speed and in the opposite rotating direction of the first transmission gear B-2.

[0077] The second transmission gear C-2 can be connected with the cross slider coupling C-13 through a gear shaft C-11, one end of the gear shaft C-11 is fixedly connected with the second transmission gear C-2, and the other end of the gear shaft C-11 is fixedly connected with the first eccentric block C-13-1 through a second expansion sleeve C-18. The gear shaft C-11 is fixedly connected with the gear fixing plate C-10 through a bearing C-12, the inner ring of the bearing C-12 is sleeved on the gear shaft C-11, and the outer ring of the bearing C-12 is embedded in the gear fixing plate C-10. A bearing limiting block C-15 is arranged between the second transmission gear C-2 and the gear fixing plate C-10 to limit the position of the second transmission gear C-2, and a check ring C-20 is arranged on the side, away from the gear fixing plate C-10, of the second transmission gear C-2 to limit the position of the second transmission gear C-2. Under the action of the check ring C-20 and the bearing limiting block C-15, the second transmission gear C-2 is fixed on the gear fixing plate C-10 and can rotate.

[0078] The paper pressing roller C-1 is fixedly connected with the second eccentric block C-13-3 in the cross slider coupling C-13 through a third expansion sleeve C-19. The paper pressing roller C-1 is connected with the eccentric gear C-8 through a bearing C-14, the inner ring of the bearing C-14 is sleeved on the paper pressing roller C-1, the outer ring of the bearing C-14 is embedded in the eccentric hole of the eccentric gear C-8, and the paper pressing roller C-1 can rotate on the eccentric gear C-8. The paper pressing roller C-1 is fixedly connected with the second eccentric block C-13-3 in the cross slider coupling C-13. The paper pressing roller C-1 is driven by the second transmission gear C-2 and rotates in the eccentric hole of the eccentric gear C-8.

[0079] By designing the meshing transmission ratio of the first transmission gear B-2 and the second transmission gear C-2, the tangential velocity of the paper pressing roller C-1 is made to be the same as the speed of the main machine conveying belt B-3, so that the print substrate A between the paper pressing roller C-1 and the main machine conveying belt B-3 is clamped and conveyed to the plane of the main machine conveying belt B-3.

[0080] In actual production, the thickness of the print substrate A has different sizes, so the paper pressing gap L needs to be steplessly adjustable. In the embodiment of the application, the paper pressing gap L is adjusted by the eccentric gear C-8, as shown in Figure 7 The paper pressing roller C-1 is installed in the eccentric hole with B point as the center of the eccentric gear C-8. The eccentric gear C-8 is fixedly connected with the sliding block C-16, the center O of the index circle of the eccentric gear C-8 coincides with the center of the sliding block C-16. The flange plate C-17 is fixedly connected with the sliding block C-16, and the flange plate C-17 limits the position of the sliding block C-16.

[0081] The frame beam C-4 can be integrally formed or assembled. The assembled frame beam C-4 can be provided with fixed side plates C-3 at both ends to mount the paper pressing roller C-1 and the like. The sliding block C-16 can rotate on the fixed side plate C-3 of the frame beam C-4, and the eccentric gear C-8 can also rotate relative to the frame beam C-4. With the rotation of the eccentric gear C-8, the center P can produce a displacement of 2 times the eccentric distance |OP| relative to the center O in the vertical direction. When the paper pressing gap L needs to be adjusted, the eccentric gear C-8 can be rotated by a certain angle to obtain different paper pressing gaps L.

[0082] The adjusting motor C-23 is connected with the first adjusting gear through the speed reducer C-22.

[0083] The action principle of adjusting the gap is that the rotation angle of the adjusting motor C-23 is controlled by the program, and the first adjusting gear is driven to rotate. The first adjusting gear and the second adjusting gear are fixedly connected at both ends of the adjusting connecting rod C-5 through the first expansion sleeve C-7, so that the first adjusting gear and the second adjusting gear rotate synchronously. The second adjusting gear rotates to drive the eccentric gear C-8 to rotate. The adjusting motor C-23 drives the rotation of the eccentric gear C-8, so as to realize the adjustment of the paper pressing gap L.

[0084] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A roller pressure structure of a printer, characterized by, Comprise: Host drive components, host conveyor belt (B-3), host driven roller (B-1), first transmission gear (B-2), second transmission gear (C-2), platen roller (C-1), frame beam (C-4), adjusting connecting rod (C-5), adjusting gear (C-6), eccentric gear (C-8) and universal coupling; The first transmission gear (B-2) is installed in the host driven roller (B-1), the second transmission gear (C-2) is installed in the platen roller (C-1); the second transmission gear (C-2) and the platen roller (C-1) are connected through the universal coupling, the power input end of the universal coupling is connected with the second transmission gear (C-2), and the power output end of the universal coupling is connected with the platen roller (C-1); The host drive components drive the host driven roller (B-1) to rotate through the host conveyor belt (B-3), and the host driven roller (B-1) drives the platen roller (C-1) to rotate through the first transmission gear (B-2) and the second transmission gear (C-2) which are in mesh with each other; wherein the transmission ratio of the first transmission gear (B-2) and the second transmission gear (C-2) is determined according to the radii of the host driven roller (B-1) and the platen roller (C-1), so that the linear speed of the platen roller (C-1) is the same as the speed of the host conveyor belt (B-3); The adjusting gear (C-6) comprises a first adjusting gear and a second adjusting gear, and the eccentric gear (C-8) comprises a first eccentric gear and a second eccentric gear; the adjusting connecting rod (C-5) is installed in parallel with the platen roller (C-1) on the frame beam (C-4), and the two ends of the adjusting connecting rod (C-5) are fixedly installed with the first adjusting gear and the second adjusting gear respectively, and the two ends of the platen roller (C-1) are rotatably installed with the first eccentric gear and the second eccentric gear respectively, the first adjusting gear is in mesh with the first eccentric gear, and the second adjusting gear is in mesh with the second eccentric gear.

2. The roller pressure structure of a printer according to claim 1, wherein Further comprising an adjusting motor (C-23); The output end of the adjusting motor (C-23) is connected with the first adjusting gear.

3. The roller pressure structure of a printer according to claim 1, wherein Further comprising a sliding block (C-16); The sliding block (C-16) is a cylindrical body, the sliding block (C-16) matches with the first circular hole of the frame beam (C-4), and the sliding block (C-16) is rotatably connected with the frame beam (C-4); the sliding block (C-16) is provided with a second circular hole, the sliding block (C-16) is fixedly connected with the eccentric gear (C-8), and the eccentric gear (C-8) is rotatably connected with the frame beam (C-4) through the sliding block (C-16).

4. The roller pressure structure of the printer according to claim 3, wherein Further comprising a flange plate (C-17), and the outer diameter of the flange plate (C-17) is greater than the diameter of the first circular hole of the frame beam (C-4); The sliding block (C-16) is provided with a shaft shoulder close to the eccentric gear (C-8), and the bottom surface of the sliding block (C-16) away from the eccentric gear (C-8) is connected with the flange plate (C-17). The shaft shoulder and the flange plate (C-17) are used to limit the axial position of the sliding block (C-16) in the first round hole of the frame beam (C-4).

5. The roll structure of a printer according to claim 1, wherein The two ends of the adjusting connecting rod (C-5) are respectively fixedly installed with the first adjusting gear and the second adjusting gear through the first expansion sleeve (C-7).

6. The roll structure of a printer according to claim 1, wherein The two ends of the paper pressing roller (C-1) are respectively installed with the first eccentric gear and the second eccentric gear through the bearing (C-14).

7. The roll structure of a printer according to claim 1, wherein The universal coupling is a cross slider coupling (C-13); The cross slider coupling (C-13) comprises a first eccentric block (C-13-1), a cross slider (C-13-2) and a second eccentric block (C-13-3), the first eccentric block (C-13-1) and the second eccentric block (C-13-3) are slidably connected through the cross slider (C-13-2); The first eccentric block (C-13-1) is fixedly connected with the second transmission gear (C-2) through the second expansion sleeve (C-18), and the second eccentric block (C-13-3) is fixedly connected with the paper pressing roller (C-1) through the third expansion sleeve (C-19).

8. The roll structure of a printer according to claim 1, wherein It also includes a host suction component; The host conveying belt (B-3) is provided with a plurality of suction holes, and the host suction component reduces the air pressure on the side of the host conveying belt (B-3) away from the printing substrate (A), so that the printing substrate (A) is adsorbed on the surface of the host conveying belt (B-3) by the suction holes.

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