Scraper device

Abstract

The utility model discloses a scraper device, and relates to the technical field of battery processing, the scraper device comprises a first base plate, a first lifting mechanism and two scraper assemblies arranged in parallel, each scraper assembly comprises a first mounting plate and a scraper rotatably mounted at the lower end of the first mounting plate, and the first lifting mechanism is arranged on the first base plate; the two scraper assemblies are both arranged at the driving end of the first lifting mechanism, the horizontal rotating axes of the two scrapers are both perpendicular to the blade extending direction of the scrapers, and the first lifting mechanism is configured to drive the two scrapers to ascend and descend. According to the scraper device, the two scrapers rotationally mounted on the corresponding first mounting plates are arranged, so that the blades of the two scrapers can be completely attached to the screen printing plates in the corresponding printing areas, the consistency of the depths of printing grid lines in the two printing areas through the scraper device at the same time is improved, the phenomena of grid missing and line breaking are avoided, and the overall printing effect is improved.

Description

Technical Field

[0001] The present application relates to the field of battery processing technology, and in particular to a scraper device. Background Art

[0002] During the production of battery modules, a printing mechanism is required to print conductive material on the surface of the battery cell to form grid lines for collecting current.

[0003] To improve printing efficiency, existing printing mechanisms use screens with two printing areas, allowing the printing mechanism to print two half-sheets of solar cells in a single squeegee. However, when a single squeegee simultaneously squeegees cells in both printing areas, it can easily lead to uneven grid lines in the two printing areas, or even grid lines missing or broken, resulting in poor printing results. Utility Model Content

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application provides a scraper device that solves the problem in the prior art that a single scraper, when simultaneously scraping two printing areas of a cell, can easily result in grid lines of varying depths or even broken lines in the two printing areas.

[0005] The purpose of this application can be achieved through the following technical solutions:

[0006] The present application provides a scraper device, which includes a first substrate, a first lifting mechanism, and two scraper assemblies arranged in parallel. The scraper assembly includes a first mounting plate and a scraper rotatably mounted at the lower end of the first mounting plate. The first lifting mechanism is arranged on the first substrate. The two scraper assemblies are both arranged on the driving end of the first lifting mechanism. The horizontal rotation axes of the two scrapers are both perpendicular to the extension direction of the scraper blade. The first lifting mechanism is configured to drive the two scrapers to rise and fall.

[0007] By setting up two parallel scrapers, the scrapers are rotatably mounted on corresponding mounting frames, and the horizontal rotation axes of the two scrapers are perpendicular to the extension direction of the scraper blades, the two scrapers can adjust their own postures separately, so that the two scraper blades can fully fit with the screen in the corresponding printing area, thereby improving the consistency of the depth of the printed grid lines of the scraper device in the two printing areas, avoiding the occurrence of missing grids and broken lines, and improving the overall printing effect.

[0008] Optionally, the scraper assembly further includes a constant pressure mechanism, the fixed end of the constant pressure mechanism is mounted on the driving end of the first lifting mechanism, the first mounting plate is mounted on the driving end of the constant pressure mechanism, and the constant pressure mechanism is configured to make the corresponding scraper contact the screen at a predetermined pressure.

[0009] The constant pressure mechanism is arranged to make the scraper and the screen plate elastically contact each other each time and the contact pressure is equal, so that the requirement for the lifting precision of the first lifting mechanism is reduced, and the consistency of printing is improved.

[0010] Optionally, the first lifting mechanism comprises a first lifting driving member and a connecting plate, the first lifting driving member is fixedly arranged on the first base plate, and the connecting plate is arranged at the driving end of the first lifting driving member; the fixed end of each constant pressure mechanism is respectively mounted at two ends of the connecting plate.

[0011] The constant pressure mechanism is selected from a pneumatic cylinder or a voice coil motor.

[0012] The specific first lifting mechanism and constant pressure mechanism are provided, and the structure is simple, the maintenance is convenient, and the running stability is good.

[0013] Optionally, the first base plate is provided with a first sliding rail extending in the vertical direction, and the connecting plate and the first mounting plate are respectively slidably mounted on the same first sliding rail through sliding blocks.

[0014] By sharing the first sliding rail by the connecting plate and the first mounting plate, the number of first sliding rails is saved, and the compactness of the structure among the connecting plate, the first mounting plate and the first base plate is improved.

[0015] Optionally, the scraper device further comprises a magnetic scale and a reading head matched with the magnetic scale, one of the magnetic scale and the reading head is mounted on the connecting plate, the other of the magnetic scale and the reading head is mounted on the first mounting plate, and the mounting positions of the magnetic scale and the reading head are corresponding.

[0016] By arranging the magnetic scale and the reading head, the distance of the constant pressure mechanism from the force rebound after the scraper contacts the screen plate can be monitored in real time, when the preset distance is reached, the first lifting driving member stops descending, and the scraper is ready for scraping at the current position.

[0017] Optionally, the scraper assembly further comprises a scraper mounting frame, the scraper mounting frame is rotatably mounted on the lower end of the first mounting plate through a rotating shaft, and the scraper is fixedly mounted on the corresponding scraper mounting frame.

[0018] The lower end of the first mounting plate is provided with a limiting pin, and the limiting pin is arranged at both ends of the rotating path of the scraper mounting frame.

[0019] By arranging the scraper mounting frame to be rotatably mounted on the first mounting plate through the rotating shaft, the scraper can automatically adjust its posture when it touches the printing screen plate, so that the blade of the scraper is in close contact with the printing screen plate, and the printing effect is ensured.

[0020] Optionally, the scraper mounting frame comprises a mounting frame body and a fixing strip arranged on one side of the mounting frame body, and the scraper is locked between the mounting frame body and the fixing strip through fasteners.

[0021] The structure of the specific scraper mounting frame is provided, facilitating the disassembly and assembly of the scraper.

[0022] Optionally, the two scrapers are provided with first baffles at the ends away from each other, and the first baffles are configured to collect the paste flowing out of the printing area back to the printing area.

[0023] Or,

[0024] The two ends of each scraper are provided with first baffles.

[0025] Two specific structure modes of the first baffles are provided. By providing the first baffles, the first baffles can collect the paste flowing out of the printing area back to the corresponding printing area during the scraping process, avoiding waste of the paste.

[0026] Optionally, the scraper forms an angle of 30-75° with the horizontal plane.

[0027] By setting the scraper to form an angle of 30-75° with the horizontal plane, the scraper can be facilitated to gather the paste during the scraping process, improving the scraping effect.

[0028] Optionally, the scraper device further comprises a rack, a second base plate, a second lifting mechanism mounted on the second base plate, and a ink returning blade. The second base plate is parallel to the first base plate and is mounted on the rack. The ink returning blade is arranged on the driving end of the second lifting mechanism, and the second lifting mechanism is configured to drive the ink returning blade to rise and fall.

[0029] The ink returning blade is provided with one, and the one ink returning blade is configured to simultaneously smear the paste layer on the two printing areas. The two ends of the ink returning blade are provided with second baffles, and the second baffles are configured to collect the paste; or,

[0030] The ink returning blade is provided with two corresponding to the scraper, and the two ink returning blades are provided with second baffles at the ends away from each other; or,

[0031] The ink returning blade is provided with two corresponding to the scraper, and the two ink returning blades are provided with second baffles at the ends away from each other.

[0032] By setting the ink returning blade and mounting the ink returning blade and the scraper on the same rack, the ink returning blade and the scraper can be used synchronously under the driving of the horizontal moving mechanism, realizing the printing while smearing the paste, and improving the printing efficiency. By providing the second baffles on the ink returning blade and providing three specific structure modes of the ink returning blade and the second baffles, the ink returning blade can collect the paste flowing out of the printing area back to the corresponding printing area through the second baffles during the smearing process, avoiding waste of the paste. BRIEF DESCRIPTION OF DRAWINGS

[0033] The application will be further described below with reference to the drawings.

[0034] Figure 1is a schematic diagram of the overall structure of the scraper device in one embodiment of the present application;

[0035] Figure 2 is a schematic diagram of the structure of the scraper and related components in one embodiment of the present application;

[0036] Figure 3 is a schematic diagram of the structure of the ink return blade and related components in one embodiment of the present application.

[0037] Legend:

[0038] 10, first base plate; 11, first lifting mechanism; 111, first lifting driving member; 112, connecting plate; 12, first mounting plate; 13, scraper; 14, constant pressure mechanism; 15, first sliding rail; 16, scraper mounting bracket; 161, mounting bracket body; 162, fixing strip; 17, rotating shaft; 18, knob; 19, limiting pin; 20, first baffle; 21, rack; 22, second base plate; 23, second lifting driving member; 24, second mounting plate; 25, ink return blade; 26, second sliding rail; 27, second baffle. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0040] Please refer to Figure 1 and Figure 2 In some embodiments, the present application provides a scraper device, which includes a first base plate 10, a first lifting mechanism 11, and two scraper assemblies arranged side by side, the scraper assembly including a first mounting plate 12 and a scraper 13 rotatably mounted at the lower end of the first mounting plate 12, the first lifting mechanism 11 being arranged on the first base plate 10, both of the scraper assemblies being arranged on the driving end of the first lifting mechanism 11, the horizontal rotation axes of both of the scrapers 13 being perpendicular to the extending direction of the blade edge of the scraper 13, and the first lifting mechanism 11 being configured to simultaneously drive both of the scrapers 13 to lift.

[0041] In the present application, the transverse movement mechanism can drive the first lifting mechanism 11 and the two scrapers 13 to move synchronously through the first substrate 10. When the first lifting mechanism 11 and the two scrapers 13 move to the preset position, the first lifting mechanism 11 drives the two scrapers 13 to lower, so that the two scrapers 13 are pressed on the screens of the two printing areas respectively. At this time, the blades of the two scrapers 13 adaptively adjust their own postures to align with the screen surfaces in the two printing areas respectively, ensuring that the blades of the two scrapers 13 are completely fitted with the screens in the corresponding printing areas, thereby improving the printing consistency of the scraper device, avoiding the occurrence of missing grids and broken lines, and improving the overall printing effect.

[0042] The horizontality of the blade of the scraper 13 is adjusted by rotating the scraper 13 relative to the first mounting plate 12 around the corresponding horizontal rotation axis.

[0043] See also Figure 2 As shown, in some embodiments, the scraper assembly further includes a constant pressure mechanism 14, the fixed end of the constant pressure mechanism 14 is mounted on the driving end of the first lifting mechanism 11, the first mounting plate 12 is fixedly mounted on the driving end of the constant pressure mechanism 14, and the constant pressure mechanism 14 is configured to make the corresponding scraper 13 contact the screen at a predetermined pressure.

[0044] When the first lifting mechanism 11 drives the two scrapers 13 to press on the screens in the two printing areas respectively, the corresponding constant pressure mechanism 14 can preset pressure to make the scrapers 13 elastically press on the screen surface in the corresponding printing area.

[0045] See also Figure 2 As shown, in some embodiments, a specific first lifting mechanism 11 is provided, and the first lifting mechanism 11 includes a first lifting drive member 111 and a connecting plate 112. The first lifting drive member 111 is fixedly arranged on the first substrate 10, and the connecting plate 112 is arranged at the driving end of the first lifting drive member 111. The connecting plate 112 is generally T-shaped. The fixed ends of each constant pressure mechanism 14 are respectively installed at both ends of the connecting plate 112. The first lifting drive member 111 can drive the two constant pressure mechanisms 14 to rise and fall synchronously through the connecting plate 112, and then drive the two scrapers 13 to rise and fall synchronously through the two constant pressure mechanisms 14.

[0046] See also Figure 2 As shown, in some embodiments, the first lifting drive member 111 is a combination of a cylinder or a motor and a linear module. The constant pressure mechanism 14 is a cylinder or a voice coil motor, which can achieve elastic contact between the scraper 13 and the screen by setting the torque of the voice coil motor or the predetermined air pressure of the cylinder.

[0047] See also Figure 2As shown, in some embodiments, the first substrate 10 is provided with a first slide rail 15 extending in the vertical direction, the first slide rail 15 is located between the connecting plate 112 and the first substrate 10, the connecting plate 112 and the first mounting plate 12 are respectively slidably mounted on the same first slide rail 15, and the first mounting plate 12 is parallel to and below the connecting plate 112. By sharing the first slide rail 15 by the connecting plate 112 and the first mounting plate 12, the number of first slide rails 15 is saved, and the compactness of the structure between the connecting plate 112, the first mounting plate 12 and the first substrate 10 is improved.

[0048] Further, the first slide rail 15 is spaced apart in the horizontal direction, and the connecting plate 112 and the first mounting plate 12 are slidably mounted on the two first slide rails 15, further improving the stability of the movement of the connecting plate 112 and the first mounting plate 12.

[0049] In some embodiments, the scraper device further comprises a magnetic scale (not shown) and a reading head (not shown) adapted thereto, one of the magnetic scale and the reading head is mounted on the connecting plate 112, the other of the magnetic scale and the reading head is mounted on the first mounting plate 12, and the mounting positions of the magnetic scale and the reading head correspond.

[0050] When the first lifting drive 111 drives the scraper 13 to descend, no relative displacement occurs between the magnetic scale and the reading head; when the scraper 13 contacts the printing screen, the scraper 13 is subjected to a reaction force from the printing screen, so that the driving end of the constant pressure mechanism 13 is compressed, and relative displacement occurs between the magnetic scale and the reading head; when the reading head reads a predetermined distance on the magnetic scale, the first lifting drive 111 stops driving the scraper 13, at this time the scraper 13 has a predetermined pressure on the printing screen that meets the process requirements, and is ready to perform the scraping process.

[0051] Please refer to Figure 1 and Figure 2 As shown, in some embodiments, the scraper assembly further comprises a scraper mounting bracket, the scraper mounting bracket is rotatably mounted on the lower end of the first mounting plate 12 through the pivot shaft 17, and the scraper 13 is fixedly installed on the corresponding scraper mounting bracket.

[0052] Please refer to Figure 1 As shown, in some embodiments, the lower end of the first mounting plate 12 is fixedly provided with two limit pins 19, the two limit pins 19 are respectively arranged on both sides of the pivot shaft 17 and are located at both ends of the rotation path of the scraper mounting bracket, so as to limit the rotation range of the scraper 13 and avoid damage caused by excessive rotation of the scraper 13 and collision with other structures.

[0053] Please refer to Figure 1 and Figure 2As shown, in some embodiments, a specific structure of the scraper mounting rack is provided. The scraper mounting rack includes a mounting rack body 161 and a fixed strip 162 arranged on one side of the mounting rack body 161. The scraper 13 is locked between the mounting rack body 161 and the fixed strip 162 by fasteners (such as screws, bolts), facilitating the disassembly and assembly of the scraper 13.

[0054] In some embodiments, to avoid pushing the paste away from the printing area during the scraping process of the scraper 13, a first baffle 20 is fixedly installed at one end of each of the two scrapers 13 away from each other. The first baffle 20 extends from the end of the scraper 13 to the scraping direction of the scraper 13 and is arranged obliquely away from the scraper 13. During the scraping process, the paste flowing along the blade of the scraper 13 to the side away from each other of the two printing areas is collected back into the printing area.

[0055] Further, the two ends of each scraper 13 are provided with a first baffle 20. The first baffles 20 at the two ends collect the paste flowing along the blade of the scraper 13 to the two sides of the two printing areas, respectively, back into the corresponding printing area, avoiding waste of the paste.

[0056] Please refer to Figure 2 As shown, in some embodiments, the scraper 13 and the horizontal plane of the scraping direction form an angle of 30-75°. Specifically, the scraper 13 and the horizontal plane can form an angle of 40°, 45°, 50°, 55°, 60°, or 70°, facilitating the scraper 13 to apply a downward force to the paste during the scraping process, ensuring that the paste passes through the screen hole stably, and improving the scraping effect.

[0057] In some embodiments, the scraper 13 includes a scraper plate and a blade extending along the horizontal direction at the lower end of the scraper plate. The scraper plate and the blade can be made of carbon fiber or polyurethane.

[0058] Please refer to Figures 1-3 As shown, in some embodiments, the scraper device further includes a rack 21, a second base plate 22, a second lifting mechanism mounted on the second base plate 22, and an ink return blade 25. The second base plate 22 is installed on the rack 21 in parallel with the first base plate 10. The ink return blade 25 is arranged on the driving end of the second lifting mechanism, and the second lifting mechanism is configured to drive the ink return blade 25 to lift and lower.

[0059] Specifically, the rack 21 can be fixedly installed at the driving end of the transverse movement mechanism (not shown) to enable the transverse movement mechanism to simultaneously drive the ink returning blade 25 and the squeegee 13 to move transversely. The second lifting mechanism includes a second lifting driving member 23 and a second mounting plate 24. The fixed end of the second lifting driving member 23 is installed on the second base plate 22, and the upper end of the second mounting plate 24 is installed at the driving end of the second lifting driving member 23. The ink returning blade 25 is installed at the lower end of the second mounting plate 24, and is used to coat a pulp layer with a predetermined thickness on the screen surface of the printing area, so that the squeegee 13 performs squeegeeing subsequently, to ensure the printing effect.

[0060] The second base plate 22 is provided with a second sliding rail 26 extending in the vertical direction, and the second mounting plate 24 is slidingly installed on the second sliding rail 26 through a sliding block, to improve the stability of the movement of the second mounting plate 24 relative to the second base plate 22.

[0061] During printing, the second lifting driving member 23 first controls the ink returning blade 25 to descend to a preset position along the second sliding rail 26, and then is driven by the transverse movement mechanism (not shown) to move transversely to coat a pulp layer on the screen of the printing area. After the coating of the pulp layer is completed, the ink returning blade 25 is raised again. Subsequently, the first lifting driving member 111 controls the squeegee 13 to descend to a preset position along the first sliding rail 15, and the transverse movement mechanism drives the squeegee 13 to move transversely to perform squeegeeing. After the squeegeeing is completed, the squeegee 13 is raised again, and thus one printing process is completed.

[0062] In some embodiments, the transverse movement mechanism drives the ink returning blade 25 and the squeegee 13 to move from the first end of the screen to the second end, and the ink returning blade 25 coats a pulp layer in the process. The transverse movement mechanism drives the ink returning blade 25 and the squeegee 13 to move from the second end of the screen back to the first end, and the squeegee 13 performs squeegeeing in the process, to improve the printing efficiency.

[0063] In some embodiments, one ink returning blade 25 is provided. At this time, the length of the ink returning blade 25 spans the screens in the two printing areas, to simultaneously coat the screens in the two printing areas with pulp.

[0064] Further, the second baffle 27 is formed by bending the ink returning blade 25 towards the coating direction and is obliquely arranged away from the ink returning blade 25, so that the second baffle 27 can gather the pulp flowing away from the two printing areas to the corresponding printing area along the ink returning blade 25 during the coating of the ink returning blade 25, to avoid the pulp flowing out from the opposite sides of the two printing areas, and thus to avoid the waste of the pulp.

[0065] In some embodiments, the two ink return blades 25 are arranged in correspondence with the two printing areas respectively and are spaced apart from each other. The two ink return blades 25 are respectively used for coating the screen printing paste layer in the two printing areas, so that each ink return blade 25 can be adaptively adjusted according to the state of the screen printing in the corresponding printing area, thereby improving the uniformity of the coating paste layer.

[0066] Further, the two ink return blades 25 are respectively provided with a second baffle 27 at one end away from each other. During the process of coating the paste layer by the two ink return blades 25, the paste flowing to the sides of the two printing areas away from each other is collected back into the corresponding printing area, thereby avoiding the waste of paste caused by the paste flowing out from the opposite sides of the two printing areas.

[0067] Further, the two ends of each ink return blade 25 are respectively provided with a second baffle 27. The four second baffles 27 can collect the paste flowing to the sides of the two printing areas back into the corresponding printing area, thereby avoiding the waste of paste caused by the paste flowing out from the opposite sides of the two printing areas and between the two printing areas.

[0068] The above describes one embodiment of the present application in detail, but the content described is only a preferred embodiment of the present application and cannot be considered as limiting the scope of the present application. Any equivalent changes and improvements made within the scope of the present application should still be attributed to the scope of the patent of the present application.

[0069] It should be noted that the terms "first", "second", and the like used in the present application do not represent any order, quantity or importance, but are only used to distinguish different components. The description of the present application with respect to "left", "right", "left side", "right side", "upper", "lower", "top", "bottom" and the like is defined based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the structure must be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the present application. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0070] In the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

Claims

1. A doctor blade device, characterized in that, The scraper device comprises a first base plate, a first lifting mechanism and two groups of parallel scraper assemblies, the scraper assembly comprises a first mounting plate and a scraper rotatably mounted at the lower end of the first mounting plate, the first lifting mechanism is arranged on the first base plate, and the two scraper assemblies are arranged on the driving end of the first lifting mechanism, the horizontal rotation axis of the two scrapers is perpendicular to the extending direction of the blade edge of the scraper, and the first lifting mechanism is configured to drive the two scrapers to lift.

2. The doctoring apparatus of claim 1, wherein, The scraper assembly further comprises a constant pressure mechanism, the fixed end of the constant pressure mechanism is mounted on the driving end of the first lifting mechanism, and the first mounting plate is mounted on the driving end of the constant pressure mechanism, and the constant pressure mechanism is configured to make the corresponding scraper contact the screen plate with a predetermined pressure.

3. The doctoring apparatus of claim 2, wherein, The first lifting mechanism comprises a first lifting driving member and a connecting plate, the first lifting driving member is fixedly arranged on the first base plate, and the connecting plate is arranged on the driving end of the first lifting driving member; the fixed end of each constant pressure mechanism is respectively mounted on the two ends of the connecting plate. The constant pressure mechanism is selected from a gas cylinder or a voice coil motor.

4. The doctoring apparatus of claim 3, wherein, The first base plate is provided with a first sliding rail extending in the vertical direction, and the connecting plate and the first mounting plate are respectively slidably mounted on the same first sliding rail through sliding blocks.

5. The doctoring apparatus of claim 3, wherein, The scraper device further comprises a magnetic scale and a reading head matched therewith, one of the magnetic scale and the reading head is mounted on the connecting plate, the other of the magnetic scale and the reading head is mounted on the first mounting plate, and the mounting positions of the magnetic scale and the reading head correspond to each other.

6. The doctoring apparatus of claim 1 wherein, The scraper assembly further comprises a scraper mounting bracket, the scraper mounting bracket is rotatably mounted on the lower end of the first mounting plate through a rotating shaft, and the scraper is fixedly mounted on the corresponding scraper mounting bracket. The lower end of the first mounting plate is provided with a limiting pin arranged on the rotating path of the scraper mounting bracket.

7. The doctoring apparatus of claim 6, wherein, The scraper mounting bracket comprises a mounting bracket body and a fixing strip arranged on one side of the mounting bracket body, and the scraper is locked between the mounting bracket body and the fixing strip through fasteners.

8. The doctoring apparatus of claim 1, wherein, The distal ends of the two scrapers are provided with first baffles, and the first baffles are configured to collect the paste flowing out of the outside of the printing area back to the printing area. Or, The two ends of each scraper are provided with first baffles.

9. The doctoring apparatus of claim 1 wherein, The included angle between the scraper and the horizontal plane is 30-75°.

10. The doctoring apparatus of any one of claims 1 to 9, wherein, The scraper device further comprises a rack, a second base plate, a second lifting mechanism mounted on the second base plate and a doctor blade, the second base plate is parallel to the first base plate and is mounted on the rack, the doctor blade is arranged on the driving end of the second lifting mechanism, and the second lifting mechanism is configured to drive the doctor blade to lift. One doctor blade is arranged, and the doctor blade is configured to simultaneously smear paste layers on two printing areas, the two ends of the doctor blade are provided with second baffles, and the second baffles are configured to collect the paste; or Two doctor blades corresponding to the scrapers are arranged, and the distal ends of the two doctor blades are provided with second baffles; or The two ink return blades are arranged on the squeegee, and each of the two ink return blades is provided with a second baffle at both ends.

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