Scraping knife mechanism and printing machine

Abstract

The utility model provides a scraping knife mechanism and a printing machine, and relates to the technical field of screen printing equipment. The scraping knife mechanism can comprise at least one scraping knife assembly and at least one first driving mechanism, and each scraping knife assembly can comprise a second driving mechanism and a scraper assembly. The scraper assembly can further comprise the scraper assembly connected to the output end of the second driving mechanism so as to be driven by the second driving mechanism to move in the second preset direction. The scraper assembly can comprise a buffering part and a scraper, one end of the buffering part is connected with the second driving mechanism, and the other end of the buffering part is connected with the scraper so as to play a buffering role when the scraper acts. Through the buffer component, when the scraper is driven by the second driving mechanism to move to make contact with the silk screen, the problem that the silk screen is damaged due to too large force is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of screen printing equipment, in particular to a scraping and sharpening knife mechanism and a printing press. Background Art

[0002] With the development of the photovoltaic industry, screen printing has been widely used to print patterns on silicon wafers due to its low cost and high speed. In the process of printing on silicon wafers, current screen printing mechanisms generally use scrapers and grinders to move back and forth on the screen to complete printing. Both the scraper and the grinder directly use the drive mechanism to move up and down. When reaching the screen, the scraper needs to have a certain force with the screen. If the force is too large, the screen will be damaged, and if the force is too small, the printing effect will be poor. Utility Model Content

[0003] An object of the first aspect of the utility model is to provide a scraper sharpening mechanism to solve the problem in the prior art that the wire mesh is damaged due to excessive force between the scraper and the wire mesh.

[0004] Another object of the first aspect of the utility model is to solve the problem in the prior art that the force between the scraper and the screen cannot be kept constant, resulting in damage to the screen or poor printing effect.

[0005] In particular, the utility model provides a scraping and sharpening knife mechanism, comprising at least one scraping and sharpening knife assembly and at least one first driving mechanism, each of the first driving mechanisms driving one or more scraping and sharpening knife assemblies to move along a first preset direction;

[0006] Each of the scraper and sharpener assemblies comprises:

[0007] A second driving mechanism extending along a second preset direction; wherein the second preset direction is perpendicular to the first preset direction; and

[0008] A scraper assembly is connected to the output end of the second driving mechanism so as to move along the second preset direction under the drive of the second driving mechanism; wherein the scraper assembly includes a buffer component and a scraper, one end of the buffer component is connected to the second driving mechanism, and the other end is connected to the scraper to play a buffering role when the scraper is in action.

[0009] Optionally, the buffer component includes a cylinder or a spring.

[0010] Optionally, the scraper assembly further comprises:

[0011] A first connecting plate, disposed at the output end of the buffer component, and connecting the scraper and the buffer component through the connecting plate;

[0012] a first sliding block connected to a side of the first connecting plate; and

[0013] The first slide rail is connected to the first driving mechanism, and the first slide rail extends along the second preset direction. The first slide rail cooperates with the first sliding block to play a guiding role when the second driving mechanism drives the connecting plate and the scraper to move.

[0014] Optionally, the scraper assembly further comprises:

[0015] A third driving mechanism, which is arranged side by side with the second driving mechanism, and the third driving mechanism extends along the second preset direction; and

[0016] a sharpening assembly, which is arranged side by side with the scraper assembly, and the sharpening assembly is connected to the output end of the third driving mechanism to move along the second preset direction under the drive of the third driving mechanism;

[0017] Wherein, the knife sharpening assembly comprises:

[0018] a second connecting plate connected to an output end of the third driving mechanism, so that the second connecting plate moves along the second preset direction under the drive of the third driving mechanism;

[0019] A sharpening tool is connected to the second connecting plate to follow the second connecting plate to move along the second preset direction.

[0020] Optionally, the number of the first driving mechanisms is the same as the number of the scraping and grinding blade assemblies, and the first driving mechanisms and the scraping and grinding blade assemblies are arranged in a one-to-one correspondence.

[0021] Optionally, the first driving mechanism includes a first motor, a first coupling and a first module extending along the first preset direction which are connected in sequence, and the first module is connected to the corresponding scraper assembly so that the scraper assembly moves along the first module driven by the corresponding first motor.

[0022] Optionally, it also includes at least one connecting rod assembly, each of which is connected to the output end of one of the first driving mechanisms and at least one scraper assembly, so as to move along the first preset direction under the drive of the first driving mechanism, thereby driving the scraper assembly to move along the first preset direction.

[0023] Optionally, the number of the first driving mechanisms is one or more, and the number of the scraping and sharpening blade assemblies is multiple;

[0024] Each of the first driving mechanisms drives a plurality of the scraping and sharpening blade assemblies.

[0025] Optionally, the first driving mechanism includes a second motor and a screw connected to an output end of the second motor, the screw rotates under the drive of the second motor; the screw extends along the first preset direction;

[0026] The connecting rod assembly comprises:

[0027] A connecting rod, which is provided with an internal threaded hole, and the internal threaded hole of the connecting rod is sleeved on the screw rod, so that when the screw rod rotates, the connecting rod moves in a translational manner along the axial direction of the screw rod;

[0028] The guide assembly comprises a second sliding block connected to the connecting rod and a second sliding rail matched with the second sliding block, wherein the second sliding rail extends along the first preset direction.

[0029] In particular, the utility model also provides a printing machine, comprising the scraping and sharpening blade mechanism described above.

[0030] The scraper mechanism of the present solution may include at least one scraper assembly and at least one first driving mechanism, and each scraper assembly may include a second driving mechanism and a scraper assembly. The scraper assembly may further include a scraper assembly connected to the output end of the second driving mechanism so as to move along a second preset direction under the drive of the second driving mechanism. The scraper assembly may include a buffer component and a scraper, one end of the buffer component is connected to the second driving mechanism, and the other end is connected to the scraper to play a buffering role when the scraper acts. The buffer component ensures that when the scraper moves to contact the screen under the drive of the second driving mechanism, there will be no problem of excessive force causing damage to the screen.

[0031] The buffer component of this solution may include a cylinder or a spring. When there is a cylinder or a spring, when the force of the scraper contacting the screen under the drive of the second drive mechanism is too large, it will play a buffering role to avoid damage to the screen due to excessive force caused by hard contact. At the same time, the cylinder will also keep the contact force between the scraper and the screen in a constant state, thereby improving the effect of screen printing.

[0032] The scraper assembly of the present invention is provided with a first slider and a first slide rail, which play a guiding role through the cooperation of the first slider and the first slide rail, thereby improving the stability of the scraper moving along the second preset direction under the drive of the second driving mechanism.

[0033] Based on the detailed description of the specific embodiments of the present invention in combination with the accompanying drawings below, those skilled in the art will become more aware of the above and other purposes, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0035] Figure 1 It is a front view of a scraping and sharpening mechanism according to a specific embodiment of the utility model;

[0036] Figure 2 is a schematic three-dimensional diagram of a scraping and sharpening mechanism according to a specific embodiment of the utility model;

[0037] Figure 3 is a front view of a scraping and sharpening mechanism according to another specific embodiment of the utility model;

[0038] Figure 4 is a schematic three-dimensional diagram of a scraping and sharpening mechanism according to another specific embodiment of the utility model;

[0039] Figure 5 is a schematic three-dimensional diagram of a scraping and sharpening mechanism according to another specific embodiment of the utility model;

[0040] Description of reference numerals:

[0041] Scraping and sharpening mechanism - 100;

[0042] Scraping and sharpening knife assembly-200; second driving mechanism-210; third motor-211, second coupling-212; second module-213; scraper assembly-220; buffer component-21; scraper-222; first connecting plate-223; first slider-224; first slide rail-225; third driving mechanism-230; fourth motor-231; third coupling-232; third module-233; sharpening knife assembly-240; second connecting plate-241; sharpening knife-242;

[0043] First driving mechanism-300; first motor-310; first module-320; second motor-330; screw-340;

[0044] Connecting rod assembly-400; connecting rod-410; internal threaded hole-411; guide assembly-420; second sliding block-421; second sliding rail-422;

[0045] Support plate-500; mounting hole-510. DETAILED DESCRIPTION

[0046] In the description of this embodiment, it should be understood that the terms "length", "width", "height", "up", "down", "left", "right", "vertical", "horizontal", "bottom", "inside" and "outside" etc. indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do 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 should not be understood as a limitation on the present invention.

[0047] As a specific embodiment of the present invention, Figure 1-Figure 5 As shown, the present embodiment discloses a scraper mechanism 100, which may include at least one scraper assembly 200 and at least one first drive mechanism 300, each first drive mechanism 300 drives one or more scraper assemblies 200 to move along a first preset direction. Each scraper assembly 200 may include a second drive mechanism 210 and a scraper assembly 220. The second drive mechanism 210 extends along a second preset direction. The second preset direction is perpendicular to the first preset direction. The scraper assembly 220 is connected to the output end of the second drive mechanism 210 to move along the second preset direction under the drive of the second drive mechanism 210. The scraper assembly 220 may include a buffer component 221 and a scraper 222 (such as Figure 5 As shown), one end of the buffer component 221 is connected to the second driving mechanism 210, and the other end is connected to the scraper 222 to play a buffering role when the scraper 222 is in action.

[0048] The scraper mechanism 100 in this embodiment may include at least one scraper assembly 200 and at least one first driving mechanism 300, and each scraper assembly 200 may include a second driving mechanism 210 and a scraper assembly 220. The scraper assembly 220 may include a scraper assembly 220 connected to the output end of the second driving mechanism 210 to move along a second preset direction under the drive of the second driving mechanism 210. The scraper assembly 220 may include a buffer component 221 and a scraper 222, one end of the buffer component 221 is connected to the second driving mechanism 210, and the other end is connected to the scraper 222 to play a buffering role when the scraper 222 acts. The buffer component 221 ensures that when the scraper 222 moves to contact the screen under the drive of the second driving mechanism 210, there will be no problem of excessive force causing the screen to be destroyed.

[0049] As a specific embodiment of the utility model, the buffer component 221 of this embodiment may include a cylinder or a spring. When there is a cylinder or a spring, when the force of the scraper 222 contacting the screen under the drive of the second drive mechanism 210 is too large, it will play a buffering role to avoid the screen being damaged by excessive force caused by hard contact. At the same time, the cylinder will also keep the contact force between the scraper 222 and the screen in a constant state, thereby improving the effect of screen printing.

[0050] In addition, the number of scraper assemblies 200 in this embodiment can be one or more. If the number of scraper assemblies 200 is multiple, multiple scraper assemblies 200 are arranged in the same scraper mechanism 100, and multiple screens can be printed at the same time, making the structure compact, occupying less space, and having high printing efficiency.

[0051] As a specific embodiment of the present invention, Figure 5 As shown, the scraper assembly 220 of this embodiment may also include a first connecting plate 223, a first slider 224 and a first slide rail 225. The first connecting plate 223 is arranged at the output end of the buffer component 221, and the scraper 222 and the buffer component 221 are connected through the connecting plate. The first slider 224 is connected to the side of the connecting plate. The first slide rail 225 is connected to the first driving mechanism 300, and the first slide rail 225 extends along the second preset direction. The first slide rail 225 cooperates with the first slider 224 to play a guiding role when the second driving mechanism 210 drives the connecting plate and the scraper 222 to move.

[0052] Specifically, the scraper assembly 220 of this embodiment is provided with a first slider 224 and a first slide rail 225, which play a guiding role through the cooperation of the first slider 224 and the first slide rail 225, thereby improving the stability of the scraper 222 moving along the second preset direction under the drive of the second driving mechanism 210.

[0053] As a specific embodiment of the present invention, Figure 5 As shown, the scraping and sharpening knife assembly 200 of this embodiment may also include a third driving mechanism 230 and a sharpening knife assembly 240. The third driving mechanism 230 is arranged side by side with the second driving mechanism 210, and the third driving mechanism 230 extends along the second preset direction. The sharpening knife assembly 240 is arranged side by side with the scraping knife assembly 220, and the sharpening knife assembly 240 is connected to the output end of the third driving mechanism 230 to move along the second preset direction under the drive of the third driving mechanism 230. The sharpening knife assembly 240 may also include a second connecting plate 241 and a sharpening knife 242. The second connecting plate 241 is connected to the output end of the third driving mechanism 230 to move along the second preset direction under the drive of the third driving mechanism 230 when the second connecting plate 241 moves along the second preset direction. The sharpening knife 242 is connected to the second connecting plate 241 to follow the second connecting plate 241 to move along the second preset direction.

[0054] Specifically, the second connecting plate 241 of this embodiment is designed to be L-shaped, with the upper end connected to the third driving mechanism 230 and the lower end connected to the sharpening knife 242, so that the sharpening knife 242 and the scraper 222 can be arranged side by side in the first preset direction.

[0055] As a specific embodiment of the present invention, Figure 1 and Figure 2 As shown, the number of the first driving mechanisms 300 in this embodiment is the same as the number of the scraping and sharpening blade assemblies 200 , and the first driving mechanisms 300 and the scraping and sharpening blade assemblies 200 are arranged in a one-to-one correspondence.

[0056] Specifically, in this embodiment, the first driving mechanism 300 and the scraping and sharpening knife assembly 200 are arranged in a one-to-one correspondence, and each first driving mechanism 300 can independently drive the corresponding scraping and sharpening knife assembly 200, so that each scraping and sharpening knife assembly 200 can operate independently to avoid mutual interference.

[0057] As a specific embodiment of the utility model, in this embodiment, when each first driving mechanism 300 corresponds to a scraper assembly 200, the first driving mechanism 300 may include a first motor 310, a first coupling (not shown in the figure) and a first module 320 extending along a first preset direction connected in sequence, and the first module 320 is connected to the corresponding scraper assembly 200 so that the scraper assembly 200 moves along the first module 320 driven by the corresponding first motor 310.

[0058] Specifically, the first module 320 is an existing standard component, which can convert the rotation of the motor into a translational motion along the length direction of the first module 320. Therefore, the length direction of the first module 320 is parallel to the first preset direction. The first motor 310 drives the first coupling to move, and the first coupling drives the first module 320, thereby driving the scraper assembly 200 to move along the first module 320.

[0059] As a specific embodiment of the utility model, the scraper mechanism 100 of this embodiment may also include at least one connecting rod assembly 400, each connecting rod assembly 400 is connected to the output end of one of the first driving mechanisms 300 and at least one scraper assembly 200, so as to move along the first preset direction under the drive of the first driving mechanism 300, thereby driving the scraper assembly 200 to move along the first preset direction.

[0060] As one of the embodiments, a first driving mechanism 300 is connected to one of the scraping and sharpening blade assemblies 200 using a connecting rod assembly 400 .

[0061] As another specific embodiment, Figure 3 and Figure 4 As shown, the number of the first driving mechanism 300 is one or more, and the number of the scraping and sharpening blade assemblies 200 is multiple. Each first driving mechanism 300 drives multiple scraping and sharpening blade assemblies 200. And in this embodiment, one driving mechanism is connected to multiple scraping and sharpening blade assemblies 200 using a connecting rod assembly 400.

[0062] When a first driving mechanism 300 drives a plurality of scraping blade assemblies 200, the first driving mechanism 300 may include a second motor 330 and a screw 340 connected to an output end of the second motor 330, and the screw 340 rotates under the drive of the second motor 330. The screw 340 extends along a first preset direction.

[0063] Specifically, the connecting rod assembly 400 may include a connecting rod 410 and a guide assembly 420, wherein the connecting rod 410 is provided with an internal threaded hole 411, and the internal threaded hole 411 of the connecting rod 410 is sleeved on the screw rod 340, so that when the screw rod 340 rotates, the connecting rod 410 moves in a translational manner along the axial direction of the screw rod 340. The guide assembly 420 may include a second slider 421 connected to the connecting rod 410 and a second slide rail 422 matched with the second slider 421, and the second slide rail 422 extends along the first preset direction.

[0064] Specifically, in this embodiment, the second motor 330 rotates to drive the screw rod 340 to rotate, the screw rod 340 drives the connecting rod 410 to move horizontally, and the connecting rod 410 drives the scraping and grinding knife assembly 200 to move horizontally. Since the connecting rod assembly 400 can also include a guide assembly 420, the scraping and grinding knife assembly 200 can also move under the guidance of the guide assembly 420, thereby improving the stability of the movement.

[0065] Specifically, the guide assembly 420 of this embodiment can be one group or multiple groups, and the multiple groups of guide assemblies 420 are parallel to the screw rod 340. For example, the number of the guide assemblies can be 2 groups, 3 groups or even more. Take the number of guide assemblies 420 as 2 groups. The two groups of guide assemblies 420 are respectively arranged on both sides of the connecting rod 410, and the screw rod 340 is arranged in the middle. At this time, the scraping blade assembly 200 is arranged between the two guide assemblies 420, thereby ensuring the stability of the movement.

[0066] As a specific embodiment of the utility model, the second driving mechanism 210 of this embodiment may include a third motor 211, a second coupling 212 and a second module 213 extending along a second preset direction connected in sequence, and the second module is connected to the buffer component 221 to drive the scraper assembly 220 to move along the second module 213.

[0067] As a specific embodiment of the utility model, the third driving mechanism 230 of this embodiment includes a fourth motor 231, a third coupling 232 and a third module 233 extending along a second preset direction which are connected in sequence. The third module 233 is connected to the second connecting plate 241 to drive the sharpening assembly 240 to move along the third module 233.

[0068] Specifically, the second module 213 and the third module 233 of this embodiment are both standard parts, which can convert the rotation of the motor into translation, thereby driving the objects connected to the modules to translate.

[0069] Specifically, the structure and operation principle of the scraping and sharpening mechanism 100 of this embodiment (taking the use of a first driving mechanism 300 to drive two scraping and sharpening assemblies 200 to move as an example, that is, Figure 3 and Figure 4 The structure shown) is as follows:

[0070] A support plate 500 is provided (the support plate 500 may be any other component capable of supporting the scraping and sharpening mechanism 100), and the first driving mechanism 300 is arranged on the support plate 500. The output end of the first driving mechanism 300 is connected to the screw rod 340, and the connecting rod 410 is sleeved on the screw rod 340 and moves in translation with the rotation of the screw rod 340. Second sliders 421 are arranged at both ends of the connecting rod 410, and the second slide rails 422 are arranged on the support plate 500. The second slider 421 and the second slide rails 422 cooperate with each other. The screw rod 340 and the two second slide rails 422 are parallel to each other and extend along the first preset direction.

[0071] Two mounting holes 510 are provided between the screw rod 340 and the second slide rail 422 on the support plate 500, and each mounting hole 510 can accommodate a scraper assembly 200. Each scraper assembly 200 is connected to the connecting rod 410 through the support plate 500.

[0072] The second driving mechanism 210 and the third driving mechanism 230 of each scraper and sharpener assembly 200 are arranged side by side. The output end of the second driving mechanism 210 is connected to the buffer component 221, and the buffer component 221 is further connected to the first connecting plate 223, so that the second driving mechanism 210 can drive the buffer component 221 and the first connecting plate 223 to drive the scraper 222 to move along the second preset direction. A first slider 224 and a first slide rail 225 are arranged between the first connecting plate 223 and the support plate 500 to guide the movement of the scraper 222. The third driving mechanism 230 is interconnected with the second connecting plate 241, thereby driving the sharpener 242 to move along the second preset direction.

[0073] Specifically, when screen printing is performed by the scraper and sharpener mechanism 100, first, the second drive mechanism 210 is used to drive the scraper 222 to descend to contact with the screen, and the first drive mechanism 300 drives the scraper and sharpener mechanism 100 to move in one direction along the first preset direction. After moving to the limit position, the second drive mechanism 210 drives the scraper 222 to rise and separate from the screen. The third drive mechanism 230 drives the sharpener 242 to descend to contact with the screen, and the first drive mechanism 300 drives the scraper and sharpener mechanism 100 to move in the opposite direction along the first preset direction. After returning to the original position, the third drive mechanism 230 lifts the sharpener 242 to separate from the screen. When the next screen printing is performed, the above process is repeated.

[0074] As a specific embodiment of the present utility model, this embodiment provides a printing machine, which may include a scraping and sharpening blade mechanism 100.

[0075] At this point, those skilled in the art should recognize that, although multiple exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived from the contents disclosed in the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all such other variations or modifications.

Claims

1. A scraping and sharpening mechanism, characterized in that: It comprises at least one scraping and sharpening blade assembly and at least one first driving mechanism, each of the first driving mechanisms drives one or more scraping and sharpening blade assemblies to move along a first preset direction; Each of the scraper and sharpener assemblies comprises: A second driving mechanism extending along a second preset direction; wherein the second preset direction is perpendicular to the first preset direction; and A scraper assembly is connected to the output end of the second driving mechanism so as to move along the second preset direction under the drive of the second driving mechanism; wherein the scraper assembly includes a buffer component and a scraper, one end of the buffer component is connected to the second driving mechanism, and the other end is connected to the scraper to play a buffering role when the scraper is in action.

2. The scraper sharpening mechanism according to claim 1, characterized in that: The buffer component includes a cylinder or a spring.

3. The scraping and sharpening mechanism according to claim 1, characterized in that: The scraper assembly also includes: A first connecting plate, disposed at the output end of the buffer component, and connecting the scraper and the buffer component through the connecting plate; a first sliding block connected to a side of the first connecting plate; and The first slide rail is connected to the first driving mechanism, and the first slide rail extends along the second preset direction. The first slide rail cooperates with the first sliding block to play a guiding role when the second driving mechanism drives the connecting plate and the scraper to move.

4. The scraper and sharpening mechanism according to claim 1, characterized in that: The scraper assembly also includes: A third driving mechanism, which is arranged side by side with the second driving mechanism, and the third driving mechanism extends along the second preset direction; and a sharpening assembly, which is arranged side by side with the scraper assembly, and the sharpening assembly is connected to the output end of the third driving mechanism to move along the second preset direction under the drive of the third driving mechanism; Wherein, the knife sharpening assembly comprises: a second connecting plate connected to an output end of the third driving mechanism, so that the second connecting plate moves along the second preset direction under the drive of the third driving mechanism; A sharpening tool is connected to the second connecting plate to follow the second connecting plate to move along the second preset direction.

5. The scraper sharpening mechanism according to any one of claims 1 to 4, characterized in that: The number of the first driving mechanisms is the same as the number of the scraping and grinding blade assemblies, and the first driving mechanisms and the scraping and grinding blade assemblies are arranged in a one-to-one correspondence.

6. The scraper and sharpening mechanism according to claim 5, characterized in that: The first driving mechanism includes a first motor, a first coupling and a first module extending along the first preset direction which are connected in sequence, and the first module is connected to the corresponding scraper assembly so that the scraper assembly moves along the first module driven by the corresponding first motor.

7. The scraper sharpening mechanism according to any one of claims 1 to 4, characterized in that: It also includes at least one connecting rod assembly, each of which is connected to the output end of one of the first driving mechanisms and at least one scraper assembly to move along the first preset direction under the drive of the first driving mechanism, thereby driving the scraper assembly to move along the first preset direction.

8. The scraper and sharpening mechanism according to claim 7, characterized in that: The number of the first driving mechanisms is one or more, and the number of the scraping and sharpening blade assemblies is multiple; Each of the first driving mechanisms drives a plurality of the scraping and sharpening blade assemblies.

9. The scraper-sharpening mechanism according to claim 8, characterized in that: The first driving mechanism includes a second motor and a screw connected to an output end of the second motor, the screw rotates under the drive of the second motor; the screw extends along the first preset direction; The connecting rod assembly comprises: A connecting rod is provided with an internal threaded hole, and the internal threaded hole of the connecting rod is sleeved on the screw rod, so that when the screw rod rotates, the connecting rod moves in translation along the axial direction of the screw rod; The guide assembly comprises a second sliding block connected to the connecting rod and a second sliding rail matched with the second sliding block, wherein the second sliding rail extends along the first preset direction.

10. A printing press, characterized in that: The utility model comprises the scraping and sharpening mechanism according to any one of claims 1 to 9.

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