Printing medium caching device and printing equipment
By adopting the moving structure of floating roller group and fixed roller group in the printing medium buffering device, adjusting the buffer amount and stabilizing tension, the problems of insufficient buffer and unstable tension are solved, and efficient printing medium transmission and equipment efficiency are achieved.
Patent Information
- Application Number
- CN202422333874.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-24
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-09-24
AI Technical Summary
When the printing speed of the existing printing media cache device is high, the buffer amount is insufficient and the response speed is poor, resulting in low overall working efficiency of the equipment and unstable tension when the strip is long, affecting the subsequent process.
Using a structure including the first and second buffer units, the floating roller group is driven to move relative to the fixed roller group by a driving device, changing the roller group spacing, adjusting the buffer amount, and alternately circling the floating roller and the fixed roller through a printing medium to stabilize the tension.
The cache amount and response speed of the cache device are improved, the printing speed is maintained, the tension during the transmission of the printing medium is stabilized, and the overall printing efficiency of the equipment is improved.
Smart Images
Figure CN223131634U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of inkjet printing, in particular to a printing medium buffer device and a printing device. Background Art
[0002] In the inkjet printing industry, the printing medium of some printed products needs to be changed from the form of a coil to the form of a single sheet. The process sequence is usually uncoiling → printing → buffering → single-sheet cutting → stacking. Since the working logics of single-sheet cutting and stacking are intermittent, a buffer unit needs to be equipped between printing and single-sheet cutting. However, when the existing buffer device has a high printing speed, there is a situation of insufficient buffer capacity and poor response speed, and it is necessary to reduce the printing speed for printing, which affects the overall working efficiency of the equipment. Moreover, when the buffered strip is long, the tension is unstable, affecting the subsequent processes. Summary of the Utility Model
[0003] In view of this, the utility model provides a printing medium buffer device and a printing device, which are used to solve the technical problem that the existing printing medium buffer device affects the overall working efficiency of the equipment.
[0004] The technical solution adopted by the utility model is as follows:
[0005] In the first aspect, the utility model provides a printing medium buffer device, which includes a frame, a first buffer unit and a driving device. The first buffer unit and the driving device are installed on the frame. The first buffer unit includes a first fixed roller group and a first floating roller group:
[0006] The first fixed roller group includes a plurality of first fixed rollers arranged along a first direction;
[0007] The first floating roller group includes a plurality of first floating rollers arranged along the first direction. The first floating roller group is located on one side of the first fixed roller group along a second direction;
[0008] The driving device is used to drive the first floating roller group to move relative to the first fixed roller group along the second direction to change the distance between the first floating roller group and the first fixed roller group;
[0009] The printing medium alternately winds around the first fixed rollers and the first floating rollers.
[0010] Preferably, it further includes a second buffer unit. The second buffer unit is installed on the frame. The printing medium enters the second buffer unit after passing through the first buffer unit;
[0011] The second buffer unit includes a second fixed roller group and a second floating roller group;
[0012] The second fixed roller group includes a plurality of second fixed rollers arranged along the first direction;
[0013] The second floating roller group includes a plurality of second floating rollers arranged in a first direction, and the second floating roller group is located on one side of the second fixed roller group in a second direction;
[0014] The driving device is further configured to drive the second floating roller group to move relative to the second fixed roller group in the second direction to change the distance between the second floating roller group and the second fixed roller group;
[0015] The printing medium alternately winds around the second fixed roller and the second floating roller.
[0016] Preferably, a tension detection member is further included, and the tension detection member is located on the conveying path of the printing medium between the first buffer unit and the second buffer unit, and the tension detection member is configured to detect the tension of the printing medium;
[0017] A speed detection member is further included, and the speed detection member is located on the printing medium conveying path before the printing medium enters the first buffer unit.
[0018] Preferably, the second buffer unit is located on one side of the first buffer unit in the second direction, and the paper feeding direction of the printing medium in the first buffer unit is opposite to the paper feeding direction in the second buffer unit.
[0019] Preferably, in the second direction, the first fixed roller group and the second fixed roller group are located between the first floating roller group and the second floating roller group, and the moving directions of the first floating roller group and the second floating roller group are opposite.
[0020] Preferably, the driving device includes a power device, a first sprocket and a chain. The power device is installed on the frame, the chain is engaged with the first sprocket, the chain is connected to the first floating roller group, the output end of the power device is connected to the first sprocket, and the first sprocket is configured to drive the chain to move in the second direction.
[0021] Preferably, the driving device further includes a tensioning sprocket. The tensioning sprocket is installed on the frame, the tensioning sprocket is located at one end of the chain away from the first sprocket, and the tensioning sprocket is engaged with the chain.
[0022] Preferably, the first floating roller group includes a first mounting plate, the first floating roller is installed on the first mounting plate, and the driving device further includes a first connecting member, and the first connecting member is respectively connected to the chain and the first mounting plate.
[0023] Preferably, the second floating roller group includes a second mounting plate, the second floating roller is mounted on the second mounting plate, the driving device further includes two connecting members, the second connecting member is respectively connected to the chain and the second mounting plate, the chain bypasses from one side of the sprocket to the other side, and the connection positions of the second connecting member and the first connecting member with the chain are respectively located on both sides of the sprocket.
[0024] In a second aspect, the present invention further provides a printing device, which includes the printing medium buffer device described in the first aspect.
[0025] Beneficial effects: The printing medium buffer device and the printing device of the present invention use a driving device to drive the first floating roller to move relative to the first fixed roller, so as to change the length of the printing medium between each pair of adjacent first floating rollers and first fixed rollers, thereby changing the buffer capacity of the entire buffer device. Therefore, the present invention can adjust the buffer capacity of the buffer device by adjusting the relative distance between the first floating roller group and the first fixed roller group. When the printing speed is relatively fast, the buffer capacity of the buffer device can be increased by moving the first floating roller group, so that the printing device can maintain a relatively high printing speed, ensuring that the printing device has a relatively high printing efficiency. Since the present invention uses the method of alternately bypassing the printing medium between the first floating roller and the first fixed roller, the length of the printing medium between the connected rollers is also smaller, so the tension during the transmission of the printing medium is more stable. Description of the Drawings
[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required to be used in the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to these drawings, and all of these are within the protection scope of the present invention.
[0027] Figure 1 is a schematic structural diagram of the printing medium buffer device of the present invention;
[0028] Figure 2 is a schematic structural diagram of the printing medium buffer device of the present invention in a buffer state;
[0029] Figure 3 is a three-dimensional structural diagram of the printing medium buffer device of the present invention from one perspective;
[0030] Figure 4 is a three-dimensional structural diagram of the printing medium buffer device of the present invention from another perspective.
[0031] Parts and their numbers in the figure:
[0032] Speed detector 1, first floating roller group 2, first floating roller 21, first mounting plate 22, tension detector 3, first fixed roller group 41, first fixed roller 411, second fixed roller group 42, second fixed roller 421, second floating roller group 5, first floating roller 51, second mounting plate 52, power assembly 6, tensioning sprocket 7, first connecting member 81, second connecting member 82, chain 9, power device 10, first sprocket 110, linkage shaft 120, frame 130. Detailed implementation
[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present 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 any actual relationship or sequence between these entities or operations. In the description of the present utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply 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 of the present utility model. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, elements defined by the statement "comprising..." do not exclude the presence of additional identical elements in the process, method, article or device including the said elements. If there is no conflict, the embodiments of the present utility model and the various features in the embodiments can be combined with each other, and all are within the protection scope of the present utility model.
[0034] Embodiment 1
[0035] As Figure 1 shown, the present utility model provides a printing medium caching device. The printing medium caching device of this embodiment includes a frame 130, a first caching unit, and a driving device. The first caching unit and the driving device are installed on the frame 130. The first caching unit includes a first fixed roller group 41 and a first floating roller group 2:
[0036] Among them, the frame 130 serves as the bearing foundation of the printing medium caching device for supporting and installing other components of the printing medium caching device.
[0037] In this embodiment, the first fixed roller group 41 includes a plurality of first fixed rollers 411 arranged in a first direction; the first fixed rollers 411 in the first fixed roller group 41 are fixed in position relative to the frame 130 and can rotate about their own axes. Specifically, in implementation, the first fixed rollers 411 can be arranged in a row in the horizontal direction.
[0038] In this embodiment, the first floating roller group 2 includes a plurality of first floating rollers 21 arranged in a first direction, and the first floating roller group 2 is located on one side of the first fixed roller group 41 in a second direction; the second floating roller 51 can change its position relative to the frame 130 and can rotate about its own axis.
[0039] The driving device is used to drive the first floating roller group 2 to move relative to the first fixed roller group 41 in the second direction to change the distance between the first floating roller group 2 and the first fixed roller group 41;
[0040] Specifically, in implementation, the first floating roller group 2 can move up and down relative to the first fixed roller group 41 in the vertical direction. When the first floating roller group 2 moves towards the direction close to the first fixed roller group 41, the distance between the first floating roller group 2 and the first fixed roller group 41 becomes smaller, and when the first floating roller group 2 moves towards the direction away from the first fixed roller group 41, the distance between the first floating roller group 2 and the first fixed roller group 41 becomes larger.
[0041] In this embodiment, the printing medium alternately winds around the first fixed rollers 411 and the first floating rollers 21. Here, winding means that a part of the printing medium winds around a part of the outer surface of the roller. Alternate winding means that the printing medium first winds around one of a pair of the first fixed rollers 411 and the first floating rollers 21 along the forward conveying path and then winds around the other, and so on until the printing medium exits the first caching unit.
[0042] For example, as shown in Figure 1 and Figure 2 As shown, the first fixed rollers 411 are arranged in a row, and the first floating rollers 21 are also arranged in a row above the first fixed rollers 411. The printing medium winds around the first fixed roller 411 at the bottom first, then winds around the first floating roller 21 closest to this first fixed roller 411 above, and then winds down to the first fixed roller 411 closest to this first floating roller 21, and so on alternately until the printing medium exits the first caching unit from the last fixed roller.
[0043] Such as Figure 2As shown in the figure, after adopting the foregoing structure, when the first floating roller 21 moves away from the first fixed roller 411 under the drive of the driving device, the distance between the first floating roller group 2 and the first fixed roller group 41 increases, and the length of the printing medium between each pair of adjacent first floating rollers 21 and first fixed rollers 411 increases. As a result, the length of the printing medium in the first buffer unit increases, and thus the buffer capacity of the entire buffer device also increases. On the contrary, when the first floating roller 21 moves closer to the first fixed roller 411 under the drive of the driving device, the distance between the first floating roller group 2 and the first fixed roller group 41 decreases, and the length of the printing medium between each pair of adjacent first floating rollers 21 and first fixed rollers 411 decreases. As a result, the length of the printing medium in the first buffer unit decreases, and thus the buffer capacity of the entire buffer device also decreases. Therefore, in this embodiment, the buffer capacity of the buffer device can be adjusted by moving the first floating roller group 2 relative to the first fixed roller group 41. In this way, when the printing speed is relatively high, the buffer capacity of the buffer device can be increased, so that the printing device can maintain a relatively high printing speed to ensure that the printing device has a relatively high printing efficiency. Since the printing medium alternates and winds around the first floating roller 21 and the first fixed roller 411, the length of the printing medium between adjacent rollers is also smaller, so the tension during the transmission of the printing medium is more stable.
[0044] The printing medium buffer device of this embodiment further includes a second buffer unit, which is installed on the frame 130, and the printing medium enters the second buffer unit after passing through the first buffer unit;
[0045] The second buffer unit includes a second fixed roller group 42 and a second floating roller group 5;
[0046] The second fixed roller group 42 includes a plurality of second fixed rollers 421 arranged along the first direction;
[0047] The second floating roller group 5 includes a plurality of second floating rollers 51 arranged along the second direction, and the second floating roller group 5 is located on one side of the second fixed roller group 42 along the second direction;
[0048] The driving device is further configured to drive the second floating roller group 5 to move relative to the second fixed roller group 42 along the second direction to change the distance between the second floating roller group 5 and the second fixed roller group 42;
[0049] The printing medium alternates and winds around the second fixed roller 421 and the second floating roller 51.
[0050] In this embodiment, the second buffer unit adopts a structure and principle similar to that of the first buffer unit, and adjusts the buffer capacity of the printing medium buffer device by driving the second floating roller group 5 to move relative to the second fixed roller group 42.
[0051] After adopting two buffer units in this embodiment, both the maximum buffer capacity and the adjustable range of the buffer capacity of the printing medium buffer device can be doubled.
[0052] In this embodiment, the second buffer unit is located on one side of the first buffer unit along the second direction. The second buffer unit and the first buffer unit are arranged along the moving direction of the floating roller group, which can make full use of the space, enabling both floating roller groups to have sufficient moving space, saving volume, and making the entire device more compact.
[0053] The paper feeding direction of the printing medium in the first buffer unit is opposite to that in the second buffer unit. Since two sets of buffer units are adopted to improve the buffer response speed, and the paper feeding direction of the printing medium is opposite between the second buffer unit and the first buffer unit, the entire device can be made more compact.
[0054] In this embodiment, in the second direction, the first fixed roller group 41 and the second fixed roller group 42 are located between the first floating roller group 2 and the second floating roller group 5, and the moving directions of the first floating roller group 2 and the second floating roller group 5 are opposite. For example Figure 2 as shown in, when the buffer capacity increases, the first floating roller group 2 moves upward, and the second floating roller group 5 moves downward. When the buffer capacity decreases, the first floating roller group 2 moves downward, and the second floating roller group 5 moves upward. This not only makes the structure of the buffer device more compact but also enables the two floating roller groups to be independent of each other during the process of adjusting the buffer capacity.
[0055] As Figure 3 and Figure 4 shown, in this embodiment, the driving device includes a power device 10, a first sprocket 110, and a chain 9. The power device 10 is installed on the frame 130. The chain 9 cooperates with the first sprocket 110. The chain 9 is connected to the first floating roller group 2. The output end of the power device 10 is connected to the first sprocket 110. The first sprocket 110 is used to drive the chain 9 to move along the second direction. The power device 10 can adopt a motor. The motor drives the first sprocket 110 to rotate, and the first sprocket 110 drives the cooperating chain 9 to move along the second direction. While moving along the second direction, the first chain 9 drives the first floating roller group 2 to move along the second direction.
[0056] The driving device further includes a tensioning sprocket 7. The tensioning sprocket 7 is installed on the frame 130. The tensioning sprocket 7 is located at one end of the chain 9 away from the first sprocket 110, and the tensioning sprocket 7 cooperates with the chain 9.
[0057] The first sprocket 110 and the tensioning sprocket 7 are arranged at both ends of the chain 9 in the second direction. One end of the first sprocket 110 is the driving end, and one end of the tensioning sprocket 7 is the driven end. The chain 9 is wound around the first sprocket 110 and the tensioning sprocket 7 and is connected end to end. When the first sprocket 110 rotates driven by the power device 10, the tensioning sprocket 7 will also rotate driven by the chain 9, and the tensioning sprocket 7 can keep the chain 9 in a tensioned state.
[0058] The first floating roller group 2 includes a first mounting plate 22, the first floating roller 21 is mounted on the first mounting plate 22, the driving device further includes a first connecting member 81, and the first connecting member 81 is respectively connected to the chain 9 and the first mounting plate 22. When the chain 9 moves up and down, it drives the first connecting member 81 to move up and down. The first connecting member 81 drives the first mounting plate 22 to move up and down, and the first mounting plate 22 drives a plurality of first floating rollers 21 mounted thereon to move up and down.
[0059] As Figure 3 and Figure 4 shown, the second floating roller group 5 includes a second mounting plate 52, the second floating roller 51 is mounted on the second mounting plate 52, the driving device further includes a second connecting member, and the second connecting member 82 is respectively connected to the chain 9 and the second mounting plate 52. Similarly, when the chain 9 moves up and down, it drives the second connecting member 82 to move up and down. The second connecting member 82 drives the second mounting plate 52 to move up and down, and the second mounting plate 52 drives a plurality of second floating rollers 51 mounted thereon to move up and down.
[0060] On the basis of the foregoing structure, in this embodiment, the chain 9 is also wound from one side of the sprocket to the other side, and the connection positions of the second connecting member 82 and the first connecting member 81 with the chain 9 are respectively located on both sides of the sprocket.
[0061] After adopting the foregoing structure, a chain 9 is divided into left and right sides by the first sprocket 110, and when the first sprocket 110 rotates, the moving directions of both sides of the chain 9 are just opposite. This embodiment utilizes this characteristic to connect the first floating roller group 2 and the second floating roller group 5 to both sides of the chain 9 respectively on both sides of the chain 9. In this way, when the first sprocket 110 rotates, it can drive the first floating roller group 2 and the second floating roller group 5 to move simultaneously, and the moving directions are just opposite, so that when the first sprocket 110 rotates by a small angle, the buffer capacity of the buffer device can be changed greatly, thereby significantly improving the buffer response speed. And after adopting the foregoing structure, the length of the printing medium between the roller groups is also smaller, and the tension of the printing medium is more stable.
[0062] Since the driving device adopts the foregoing structure, it can drive the second floating roller to move relative to the second fixed roller while driving the first floating roller to move relative to the first fixed roller, thereby changing the length of the printing medium between each pair of adjacent first floating rollers and first fixed rollers, second floating rollers and second fixed rollers, and thus changing the buffering capacity of the entire buffering device. Therefore, in this embodiment, the buffering capacity of the buffering device can be adjusted by simultaneously adjusting the relative distances between the two sets of floating roller sets and the two sets of fixed roller sets. When the printing speed is relatively high, the buffering capacity of the buffering device can be increased by simultaneously moving the two sets of floating roller sets, so that the printing device can maintain a relatively high printing speed, thereby ensuring that the printing device has a relatively high printing efficiency.
[0063] Since the present utility model adopts two sets of floating roller sets and two sets of fixed roller sets, and the fixed roller sets are arranged between the floating roller sets, the length to be stored each time between the connected rollers is smaller when the printing medium alternately winds around, so the tension during the transmission of the printing medium is more stable.
[0064] Since the fixed roller and the floating roller have two ends. Therefore, the frame 130 includes two fixing plates, and the two ends of the fixed roller are respectively installed on the two fixing plates. The foregoing first sprocket 110, chain 9, tensioning sprocket 7, first mounting plate 22, first connecting member 81, second mounting plate 52, second connecting member 82, etc. are all provided in pairs, and the two components in the same pair are respectively installed on the two fixing plates. The power device 10 can also be provided with only one. In this case, one of the first sprockets 110 is connected to the output end of the power device 10, and the other first sprocket 110 is connected to the first sprocket 110 connected to the power device 10 through a linkage shaft 120.
[0065] As Figure 1 and Figure 2 shown, the printing medium buffering device of this embodiment further includes a tension detection member 3. The tension detection member 3 is located on the transmission path of the printing medium between the first buffering unit and the second buffering unit, and the tension detection member 3 is used to detect the tension of the printing medium;
[0066] The printing medium buffering device of this embodiment further includes a speed detection member 1. The speed detection member 1 is located on the printing medium conveying path before the printing medium enters the first buffering unit. The speed detection member 1 is used to detect the real-time running speed of the printing medium at this position.
[0067] The printing medium buffering device of this embodiment further includes a power assembly 6. The power assembly 6 is used to traction the printing medium to the subsequent process. When the strip needs to be buffered, the power assembly 6 stops the traction action, and the system controls the first floating roller set 2 and the second floating roller set 5 to move away from the fixed roller set according to the speed feedback of the speed detection member 1.
[0068] Embodiment 2
[0069] This embodiment also provides a printing device, which includes the printing medium caching device described in Embodiment 1.
[0070] As described above, these are only the specific implementation manners of the present utility model. Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the above-described systems, modules, and units can refer to the corresponding processes in the foregoing method embodiments, and will not be described herein again. It should be understood that the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered within the protection scope of the present utility model.
[0071] As described above, these are only the specific implementation manners of the present utility model. Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the above-described systems, modules, and units can refer to the corresponding processes in the foregoing method embodiments, and will not be described herein again. It should be understood that the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered within the protection scope of the present utility model.
Claims
1. A printing medium caching device, characterized in that, It includes a frame, a first buffer unit and a driving device. The first buffer unit and the driving device are installed on the frame. The first buffer unit includes a first fixed roller group and a first floating roller group: The first fixed roller group includes a number of first fixed rollers arranged in a first direction; The first floating roller group includes a number of first floating rollers arranged in a first direction. The first floating roller group is located on one side of the first fixed roller group in a second direction; The driving device is used to drive the first floating roller group to move relative to the first fixed roller group in the second direction to change the distance between the first floating roller group and the first fixed roller group; The printing medium alternately winds around the first fixed roller and the first floating roller.
2. The printing medium caching device according to claim 1, wherein It further includes a second buffer unit. The second buffer unit is installed on the frame. The printing medium enters the second buffer unit after passing through the first buffer unit; The second buffer unit includes a second fixed roller group and a second floating roller group; The second fixed roller group includes a number of second fixed rollers arranged in a first direction; The second floating roller group includes a number of second floating rollers arranged in a first direction. The second floating roller group is located on one side of the second fixed roller group in a second direction; The driving device is also used to drive the second floating roller group to move relative to the second fixed roller group in the second direction to change the distance between the second floating roller group and the second fixed roller group; The printing medium alternately winds around the second fixed roller and the second floating roller.
3. The printing medium caching device according to claim 2, wherein It further includes a tension detection member. The tension detection member is located on the transmission path of the printing medium between the first buffer unit and the second buffer unit. The tension detection member is used to detect the tension of the printing medium; It further includes a speed detection member. The speed detection member is located on the printing medium conveying path before the printing medium enters the first buffer unit.
4. The printing medium caching device according to claim 2, wherein The second buffer unit is located on one side of the first buffer unit in the second direction. The paper feeding direction of the printing medium in the first buffer unit is opposite to that in the second buffer unit.
5. The printing medium caching device according to claim 4, wherein, In the second direction, the first fixed roller group and the second fixed roller group are located between the first floating roller group and the second floating roller group. The moving directions of the first floating roller group and the second floating roller group are opposite.
6. The printing medium caching device according to claim 5, characterized in that, The driving device includes a power device, a first sprocket and a chain. The power device is installed on the frame. The chain is engaged with the first sprocket. The chain is connected to the first floating roller group. The output end of the power device is connected to the first sprocket. The first sprocket is used to drive the chain to move in the second direction.
7. The printing medium caching device according to claim 6, wherein, The driving device further includes a tensioning sprocket. The tensioning sprocket is installed on the frame. The tensioning sprocket is located at one end of the chain away from the first sprocket. The tensioning sprocket is engaged with the chain.
8. The printing medium caching device according to claim 6, characterized in that, The first floating roller group includes a first mounting plate. The first floating roller is installed on the first mounting plate. The driving device further includes a first connecting member. The first connecting member is respectively connected to the chain and the first mounting plate.
9. The printing medium caching device according to claim 8, wherein The second floating roller group includes a second mounting plate, and the second floating roller is mounted on the second mounting plate. The driving device further includes a second connecting member, and the second connecting member is respectively connected to the chain and the second mounting plate. The chain bypasses from one side of the sprocket to the other side, and the connection positions of the second connecting member and the first connecting member to the chain are respectively located on both sides of the sprocket. The printing medium enters and exits from the lower part of the printing medium buffer device.
10. A printing device, characterized in that, Including the printing medium buffer device according to any one of claims 1 to 9.