Feeding device and cutting machine

Abstract

The utility model relates to the technical field of cutting equipment, in particular to a feeding device and a cutting machine, the feeding device comprises a base, a clamping assembly and a guide roller device, the clamping assembly is arranged on the base and used for clamping materials, the guide roller device is arranged on one side of the clamping assembly, and the guide roller device is arranged on the other side of the clamping assembly. The guide roller device comprises a guide roller body and a support assembly, and the support assembly guides the guide roller body to move up and down. In the return stroke process of the feeding device, the guide roller body can be lifted upwards, so that materials are supported, a certain space is generated between the materials and the base, friction between the materials and the base is avoided, friction force between the materials and the base is converted into rotating friction of the guide roller, and the material conveying efficiency is improved. Therefore, the problem that the materials are dragged back in the return process is effectively avoided, the feeding efficiency is improved, and the materials are protected.

Description

TECHNICAL FIELD

[0001] The utility model relates to cutting equipment technical field, especially a feeding device and cutting machine. BACKGROUND

[0002] In the precise cutting process of modern industrial production, the precise cutting of long strip material generally relies on efficient feeding device. This device is responsible for firmly clamping the long strip material to be processed and realizing accurate reciprocating motion along the preset guide rail, ensuring the accuracy of feeding operation.

[0003] After the feeding device accurately delivers the material to the specified position, the clamping assembly will be timely loosened to ensure that the material stays on the specified station. Then, the feeding device needs to return to its initial position to fully prepare for the next feeding task. However, due to the fact that part of the long strip material is still resting on the platform of the feeding device, the friction caused by gravity may inadvertently drag the material back during the return of the feeding device. This phenomenon not only interferes with the precise positioning of the material, but also may adversely affect the entire subsequent processing process. SUMMARY

[0004] The technical problem to be solved by the utility model is to solve one or more technical problems existing in the prior art and at least provide a beneficial option or create conditions.

[0005] The solution to the technical problem of the utility model is a feeding device, which includes a base, a clamping assembly, and a guide roller device. The clamping assembly is arranged on the base and is used to clamp the material. The guide roller device is arranged on one side of the clamping assembly and includes a guide roller body and a bracket assembly. The bracket assembly guides the up-and-down movement of the guide roller body.

[0006] The utility model has the beneficial effects that in the feeding process, the guide roller device can guide the smooth entry of the material into the clamping assembly, the clamping assembly effectively clamps the material, and the stability and accuracy of the material during the feeding process are ensured. During the return process of the feeding device, the guide roller body can be lifted upward to support the material, creating a space between the material and the base, avoiding friction between the material and the base, and converting the friction between the material and the base into rotational friction of the guide roller, thereby effectively avoiding the problem of the material being dragged back during the return process, improving the efficiency of feeding, and protecting the material.

[0007] As a further improvement of the above technical solution, the bracket assembly includes two bracket bodies, the guide roller body is arranged between the two bracket bodies, the bracket bodies are provided with a sliding groove extending upward and downward, the depth of the sliding groove penetrates the bracket body, and the two ends of the guide roller body are slidingly installed in the sliding groove.

[0008] As a further improvement of the above technical solution, the two bracket bodies are used in cooperation with each other, and the guide roller body is arranged between the bracket bodies to ensure its stability and functionality. The bracket body is provided with a sliding groove extending upward and downward, and the depth of the sliding groove penetrates the bracket body, thereby providing sufficient space for the installation of the guide roller body. The two ends of the guide roller body are slidingly installed in the sliding groove, which ensures the stability of the guide roller body in the sliding groove and also allows the guide roller body to move up and down in the vertical direction, thereby flexibly adjusting the position of the guide roller body to adapt to different working requirements.

[0009] As a further improvement of the above technical solution, the guide roller body comprises a roller shaft, a roller cylinder and two bearings. The two ends of the roller shaft are slidingly installed in the sliding groove. The roller cylinder is sleeved on the roller shaft. The bearings are arranged between the roller shaft and the roller cylinder. The inner wall of the bearing abuts against the outer wall of the roller shaft. The outer wall of the bearing abuts against the inner wall of the roller cylinder. The roller cylinder is used for placing materials.

[0010] As a further improvement of the above technical solution, the bearings ensure smooth relative rotation between the roller cylinder and the sliding groove, improve the passing efficiency of the materials, reduce the wear caused by friction, and disperse and absorb the impact and pressure during work, thereby reducing the noise generated during equipment operation and providing a quieter working environment for the operators.

[0011] As a further improvement of the above technical solution, the bracket assembly further comprises a first driving device and two inclined wedge blocks. The bracket body is further provided with a guide groove. The guide groove is arranged vertically with the sliding groove. The inclined wedge blocks are correspondingly inserted into the guide grooves. The first driving device drives the inclined wedge blocks to slide in the guide grooves. The top of the sliding block abuts against the outer wall of the roller shaft.

[0012] As a further improvement of the above technical solution, the first driving device drives the inclined wedge blocks to slide along a predetermined path in the guide groove with high precision. The top of the sliding block is designed to abut against the outer wall of the roller shaft. When the inclined wedge block slides in the guide groove, the contact between the top of the inclined wedge block and the outer wall of the roller shaft can effectively push the roller shaft, thereby achieving fine adjustment of the position of the roller shaft.

[0013] As a further improvement of the above technical solution, the top of the inclined wedge block is provided with an inclined surface, which abuts against the outer wall of the roller shaft.

[0014] As a further improvement of the above technical solution, when the wedge block moves during operation, the interaction force between the inclined surface and the outer wall of the roller shaft will guide the roller shaft to move up and down accordingly. The inclined surface provides a stable contact surface, ensuring the stability of the wedge block when sliding in the guide groove, and reducing errors caused by poor contact or smooth sliding. The inclined surface makes the force transmission between the wedge block and the roller shaft more uniform and effective, reducing the risk of roller shaft deviation or damage caused by uneven force distribution, thereby enhancing the stability and durability of the entire system.

[0015] As a further improvement of the above technical solution, the bracket body is further provided with a pulley, which is arranged at the bottom of the guide groove, and the outer surface of the pulley is in contact with the bottom surface of the wedge block.

[0016] As a further improvement of the above technical solution, the movement of the wedge block in the guide groove becomes smoother and more efficient, improving the stability and reliability of the overall structure, reducing friction during operation, prolonging the service life of the equipment, and enhancing the convenience of operation.

[0017] As a further improvement of the above technical solution, the bracket body is further provided with a fixed part, and the fixed part is provided with a positioning hole, which is fixed to the base through a bolt.

[0018] As a further improvement of the above technical solution, the installation process of the bracket is simplified through the fixed part and the positioning hole, and the stability of the bracket is enhanced by using a bolt fastening, effectively reducing the risk of equipment caused by shaking; in addition, the adaptability of the bracket is significantly improved, making it able to adapt to various bases and installation environments, meeting more diversified use requirements.

[0019] As a further improvement of the above technical solution, the clamping assembly includes a first clamping device, a second clamping device, and a second driving device. The first clamping device and the second clamping device are arranged at both ends of the base, and the second driving device drives the first clamping device and the second clamping device to clamp up and down.

[0020] As a further improvement of the above technical solution, the first clamping device and the second clamping device clamp and fix the starting end of the material, effectively realizing the transfer and transportation of the material. The two independently liftable clamping devices allow the operator to flexibly adjust the clamping action of the first clamping device and the second clamping device according to the specific length and shape of the material, thereby achieving the best clamping effect. This improvement not only improves the efficiency of material processing, but also reduces the risk during operation, ensuring the smoothness and safety of the entire material transfer and transportation process.

[0021] As a further improvement to the above technical solution, the clamping assembly further includes a third clamping device and a third driving device, wherein the third driving device drives the third clamping device to perform front and rear clamping.

[0022] As a further improvement to the above technical solution, the third clamping device can effectively clamp and position the material in the front-to-back direction, which improves the stability of the material during the cutting process and effectively prevents the material from shifting back and forth during the cutting process. This not only improves the cutting accuracy but also ensures the smoothness and efficiency of the entire processing process.

[0023] A cutting machine includes a frame and a drive module, a guide rail, and a feeding device as described in any of the above, all mounted on the frame. The feeding device is slidably connected to the guide rail, and the drive module is drively connected to the feeding device. The drive module drives the feeding device to reciprocate along the length direction of the guide rail.

[0024] The beneficial effects of this utility model are as follows: This utility model provides a cutting machine, including a frame and a drive module, a guide rail, and a feeding device mounted on the frame. The feeding device is slidably connected to the guide rail, and the drive module is drively connected to the feeding device. The drive module drives the feeding device to reciprocate along the length of the guide rail. Through this design, the guide roller device on the feeding device can effectively avoid the pull-back phenomenon caused by the friction of the material's gravity when the feeding device returns to the initial position, thereby ensuring the accurate positioning of the material and avoiding adverse effects on subsequent processing. Attached Figure Description

[0025] Fig. 1 This is one of the structural schematic diagrams of this utility model;

[0026] Fig. 2 This is the second structural schematic diagram of this utility model;

[0027] Fig. 3 This is a schematic diagram of the guide roller device;

[0028] Fig. 4 This is a cross-sectional view of the support assembly.

[0029] In the attached figures: 1-base, 2-clamping assembly, 201-first clamping device, 202-second clamping device, 203-second driving device, 204-third clamping device, 205-third driving device, 3-guide roller device, 301-guide roller body, 302-support assembly, 303-support body, 304-slide groove, 305-roller shaft, 306-roller, 307-bearing, 308-first driving device, 309-wedge slider, 310-guide groove, 311-pulley, 312-fixed part, 313-positioning hole. DETAILED DESCRIPTION

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the above embodiment description are briefly introduced. Obviously, the described drawings are only a part of the embodiments of the present application, rather than all the embodiments, and the person skilled in the art can obtain other design schemes and drawings from these drawings without creative labor.

[0031] The concept, specific structure and generated technical effects of the present application will be clearly and completely described below in combination with the embodiments and drawings, so as to fully understand the purpose, features and effects of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments, and the person skilled in the art can obtain other embodiments without creative labor based on the embodiments of the present application, which all belong to the protection scope of the present application. In addition, all the coupling / connection relations mentioned in the text do not mean that the components are directly connected, but that a better coupling structure can be composed by adding or reducing coupling accessories according to the specific implementation situation. The various technical features in the present application can be interactively combined without mutual contradiction and conflict.

[0032] In the precise cutting process of modern industrial production, the precise cutting of long strip materials generally relies on an efficient feeding device. This device is responsible for firmly clamping the long strip material to be processed and realizing accurate reciprocating motion along the preset guide rail, ensuring the accuracy of the feeding operation.

[0033] After the feeding device accurately delivers the material to the specified position, the clamping assembly 2 will be timely loosened to ensure that the material stays on the specified station. Then, the feeding device needs to return to its initial position in order to fully prepare for the next round of feeding task. However, due to the fact that part of the long strip material is still placed on the platform of the feeding device, the friction force caused by gravity may inadvertently drag the material back during the return of the feeding device. This phenomenon not only interferes with the accurate positioning of the material, but also may have an adverse effect on the entire subsequent processing process.

[0034] Therefore, the present application provides a feeding device, which refers to Figs. 1-4 which comprises a base 1, a clamping assembly 2 and a guide roller device 3, the clamping assembly 2 is arranged on the base 1, the clamping assembly 2 is used for clamping the material, the guide roller device 3 is arranged on one side of the clamping assembly 2, the guide roller device 3 comprises a guide roller body 301 and a bracket assembly 302, the bracket assembly 302 guides the guide roller body 301 to move up and down.

[0035] In the feeding process, the guide roller device 3 can guide the material to smoothly enter the clamping assembly 2, and the clamping assembly 2 effectively clamps the material to ensure the stability and accuracy of the material during the feeding process. In the return process of the feeding device, the guide roller body 301 can be lifted upward to support the material, so that a certain space is generated between the material and the base 1, thereby avoiding the friction between the material and the base 1. The friction between the material and the base 1 is converted into the rotational friction of the guide roller, thereby effectively avoiding the problem that the material is dragged back during the return process, improving the efficiency of feeding and protecting the material.

[0036] When bearing load or being subjected to external force, the guide roller body 301 may sway or deviate. Therefore, in an embodiment, the support assembly 302 includes two support bodies 303, the guide roller body 301 is arranged between the two support bodies 303, the support body 303 is provided with a sliding groove 304 extending upward and downward, the depth of the sliding groove 304 penetrates the support body 303, and the two ends of the guide roller body 301 are slidingly installed in the sliding groove 304. The two support bodies 303 are used in cooperation, the guide roller body 301 is arranged between the support bodies 303 to ensure its stability and functionality, the support body 303 is provided with a sliding groove 304 extending upward and downward, the depth of the sliding groove 304 penetrates the support body 303, thereby providing sufficient space for the installation of the guide roller body 301, and the two ends of the guide roller body 301 are slidingly installed in the sliding groove 304 to ensure the stability of the guide roller body 301 in the sliding groove 304, while allowing it to move up and down in the vertical direction, thereby flexibly adjusting the position of the guide roller body 301 to adapt to different working requirements.

[0037] If the guide roller body 301 does not rotate smoothly, it will affect the passing efficiency of the material. Therefore, in an embodiment, the guide roller body 301 includes a roller shaft 305, a roller barrel 306 and two bearings 307, the two ends of the roller shaft 305 are slidingly installed in the sliding groove 304, the roller barrel 306 is sleeved on the roller shaft 305, the bearing 307 is arranged between the roller shaft 305 and the roller barrel 306, the inner wall of the bearing 307 abuts against the outer wall of the roller shaft 305, the outer wall of the bearing 307 abuts against the inner wall of the roller barrel 306, and the roller barrel 306 is used for placing the material. The bearing 307 ensures that the roller barrel 306 and the sliding groove 304 can rotate smoothly relative to each other, improves the passing efficiency of the material, reduces the wear caused by friction, and the bearing 307 can disperse and absorb the impact and pressure during work, thereby reducing the noise generated during equipment operation, thereby providing a quieter working environment for the operator.

[0038] The position adjustment of the roller shaft 305 is not accurate, which will affect the overall performance and accuracy of the device. Therefore, in an embodiment, the support assembly 302 further comprises a first driving device 308 and two inclined wedge blocks 309, and the support body 303 is further provided with guide grooves 310 which are arranged vertically with the sliding groove 304, the inclined wedge blocks 309 are correspondingly inserted into the guide grooves 310, and the first driving device 308 drives the inclined wedge blocks 309 to slide in the guide grooves 310, and the top of the sliding block is in close contact with the outer wall of the roller shaft 305. The first driving device 308 drives the inclined wedge blocks 309 to slide along the predetermined path in the guide grooves 310, and the top of the sliding block is designed to be in close contact with the outer wall of the roller shaft 305. When the inclined wedge blocks 309 slide in the guide grooves 310, the contact between the top of the inclined wedge blocks 309 and the outer wall of the roller shaft 305 can effectively push the roller shaft 305, so as to realize fine adjustment of the position of the roller shaft 305.

[0039] Preferably, the first driving device 308 is a pneumatic cylinder, and can be replaced by a linear motor, a hydraulic machine, a gear and rack device, etc.

[0040] The inclined wedge blocks 309 and the roller shaft 305 are not in good contact or smooth sliding, which will cause errors. Therefore, in an embodiment, the top of the inclined wedge blocks 309 is provided with an inclined surface which is in contact with the outer wall of the roller shaft 305. When the inclined wedge blocks 309 are displaced during operation, the interaction force between the inclined surface and the outer wall of the roller shaft 305 will guide the roller shaft 305 to move up and down correspondingly. The inclined surface provides a stable contact surface, ensures the stability of the inclined wedge blocks 309 when sliding in the guide grooves 310, and reduces the errors caused by poor contact or smooth sliding. The inclined surface makes the force transmission between the inclined wedge blocks 309 and the roller shaft 305 more uniform and effective, reduces the risk of roller shaft 305 deviation or damage caused by uneven distribution of force, and further enhances the stability and durability of the entire system.

[0041] The movement of the inclined wedge blocks 309 in the guide grooves 310 will be resisted, which may cause the movement to be not smooth and affect the operation efficiency of the device. Therefore, in an embodiment, the support body 303 is further provided with a pulley 311 which is arranged at the bottom of the guide grooves 310, and the outer surface of the pulley 311 is in contact with the bottom surface of the inclined wedge blocks 309. The movement of the inclined wedge blocks 309 in the guide grooves 310 becomes more smooth and efficient, which improves the stability and reliability of the overall structure, reduces the friction force during operation, prolongs the service life of the device, and enhances the convenience of operation.

[0042] More time and effort may be required to ensure the stability and accuracy of the bracket during installation. Thus, in an embodiment, the bracket body 303 is further provided with a fixing portion 312, which is provided with a positioning hole 313 that is fixed to the base 1 by a bolt. Through the fixing portion 312 and the positioning hole 313, the installation process of the bracket is simplified, the stability of the bracket is enhanced by using bolt fastening, and the risk of equipment caused by shaking is effectively reduced; in addition, the adaptability of the bracket is significantly improved, which can adapt to various bases 1 and installation environments, and meet more diversified use requirements.

[0043] During the material transfer process, the material may be raised due to various reasons, causing damage to the material. Thus, in an embodiment, the clamping assembly 2 includes a first clamping device 201, a second clamping device 202, and a second driving device 203, the first clamping device 201 and the second clamping device 202 are respectively arranged at both ends of the base 1, and the second driving device 203 drives the first clamping device 201 and the second clamping device 202 to clamp up and down. The first clamping device 201 and the second clamping device 202 clamp and fix the starting end of the material, effectively realizing the transfer and transportation of the material. Two independently liftable clamping devices allow the operator to flexibly adjust the clamping action of the first clamping device 201 and the second clamping device 202 according to the specific length and shape of the material, so as to achieve the best clamping effect. This improvement not only improves the efficiency of material processing, but also reduces the risk in the operation process, ensuring the smoothness and safety of the entire material transfer and transportation process. The first clamping device 201 and the second clamping device 202 in the present embodiment are well-known technologies in the art, which will not be described here.

[0044] Preferably, the second driving device 203 is a pneumatic cylinder, and can be replaced by a linear motor, a hydraulic machine, a gear rack device, etc.

[0045] Preferably, the first clamping device 201 and the second clamping device 202 can use independent driving sources.

[0046] Preferably, the first clamping device 201 and the second clamping device 202 are driven by the same power source, which can simplify the overall structure and reduce the overall production cost.

[0047] In the process of material transfer, the material may slide, which may cause damage to the material. Thus, in an embodiment, the clamping assembly 2 further comprises a third clamping device 204 and a third driving device 205, which drives the third clamping device 204 to clamp front and back. The third clamping device 204 can effectively clamp and position the material in the front and back directions, improve the stability of the material in the cutting process, effectively prevent the front and back deviation of the material in the cutting process, not only improve the cutting accuracy, but also ensure the smoothness and efficiency of the whole processing process. The third clamping device 204 in the embodiment is a known technology in the art, which will not be described here.

[0048] Preferably, the third driving device 205 is a cylinder, and can be replaced by a linear motor, a hydraulic machine, a gear rack device and the like linear driving source.

[0049] A cutting machine comprises a rack and a driving module, a guide rail and a feeding device as described in any one of the above embodiments, wherein the feeding device is in sliding connection with the guide rail, the driving module is in transmission connection with the feeding device, and the driving module drives the feeding device to reciprocate along the length direction of the guide rail.

[0050] The utility model provides a kind of cutting machine, including rack and driving module, guide rail and feeding device being set on rack. Feeding device is in sliding connection with guide rail, driving module is in transmission connection with feeding device, and driving module drives feeding device to reciprocate along the length direction of guide rail. By this design, the back-pulling phenomenon caused by friction due to material gravity when the guide roller device 3 on feeding device returns to initial position can be effectively avoided, so as to ensure the accurate positioning of material, avoid the adverse effect on subsequent processing process.

[0051] Preferably, the driving module is a linear sliding module.

[0052] In the feeding process, the material is guided into the clamping assembly 2 through the guide roller device 3, the first clamping device 201 and the second clamping device 202 in the clamping assembly 2 perform up-down movement under the drive of the second driving device 203, the material is clamped in the vertical direction, the third clamping device 204 performs front-back movement under the drive of the third driving device 205, and the material is clamped in the front-back direction; after ensuring that the material is firmly clamped, the driving module is started, the feeding device is pushed to move along the guide rail, and the clamped material is accurately transported to the next station; after the feeding is completed, the clamping assembly 2 releases the material, and the material stays on the specified station, at this time, the material contacts the base 1, then the first driving device 308 is started, the inclined wedge block 309 slides in the guide groove 310, the pulley 311 at the bottom of the guide groove 310 assists the movement of the inclined wedge block 309, the inclined surface at the top of the inclined wedge block 309 abuts against the outer wall of the guide roller, under the drive of the first driving device 308, the inclined wedge block 309 exerts force on the guide roller, the guide roller body 301 rotates upward along the inclined surface, so that the guide roller body 301 moves upward in the sliding groove 304, lifts the end of the material, forms a certain space between the material and the base 1, avoids the friction between the material and the base 1, and converts the friction between the material and the base 1 into the rotational friction of the guide roller, effectively preventing the problem that the material is dragged back during the return process; finally, the driving module return is started, the feeding device returns to the initial position, and the next feeding is prepared.

[0053] The preferred embodiments of the utility model are specifically described above, but the utility model is not limited to the described embodiments, and those skilled in the art can make various equivalent modifications or replacements without departing from the spirit of the utility model, and these equivalent modifications or replacements are all included in the range defined by the claims of the present application.

Claims

1. A feeding device, characterized in that, The utility model provides a material clamping device, including base (1), clamping assembly (2) and guide roller device (3), clamping assembly (2) is arranged on base (1), clamping assembly (2) is used for clamping material, guide roller device (3) is arranged in one side of clamping assembly (2), guide roller device (3) includes guide roller body (301) and support assembly (302), support assembly (302) guides the up and down movement of guide roller body (301).

2. A feeder as claimed in claim 1, wherein The support assembly (302) includes two support bodies (303), the guide roller body (301) is arranged between the two support bodies (303), the support body (303) is provided with a chute (304) extending upward and downward, the depth of the chute (304) penetrates the support body (303), and the two ends of the guide roller body (301) are slidably installed in the chute (304).

3. A feeder device according to claim 2, wherein, The guide roller body (301) includes a roller shaft (305), a roller barrel (306), and two bearings (307), the two ends of the roller shaft (305) are slidably installed in the chute (304), the roller barrel (306) is sleeved on the roller shaft (305), the bearings (307) are arranged between the roller shaft (305) and the roller barrel (306), the inner wall of the bearing (307) abuts against the outer wall of the roller shaft (305), the outer wall of the bearing (307) abuts against the inner wall of the roller barrel (306), and the roller barrel (306) is used for placing material.

4. A feeder device according to claim 3, wherein The support assembly (302) further includes a first driving device (308) and two inclined wedge blocks (309), the support body (303) is further provided with a guide groove (310), the guide groove (310) is arranged perpendicularly to the chute (304), the inclined wedge blocks (309) are correspondingly inserted into the guide groove (310), the first driving device (308) drives the inclined wedge blocks (309) to slide in the guide groove (310), and the top of the sliding block abuts against the outer wall of the roller shaft (305).

5. A feeder device according to claim 4, wherein The top of the inclined wedge block (309) is provided with an inclined surface, and the inclined surface abuts against the outer wall of the roller shaft (305).

6. A feeder device according to claim 4, wherein, The support body (303) is further provided with a pulley (311), the pulley (311) is arranged at the bottom of the guide groove (310), and the outer surface of the pulley (311) abuts against the bottom surface of the inclined wedge block (309).

7. A feeder as claimed in claim 2, wherein The support body (303) is further provided with a fixing portion (312), the fixing portion (312) is provided with a positioning hole (313), and the positioning hole (313) is fixed to the base (1) by bolts.

8. A feeder as claimed in claim 1, wherein The clamping assembly (2) includes a first clamping device (201), a second clamping device (202), and a second driving device (203), the first clamping device (201) and the second clamping device (202) are arranged at the two ends of the base (1) respectively, and the second driving device (203) drives the first clamping device (201) and the second clamping device (202) to clamp upward and downward.

9. A feeder as claimed in claim 1, wherein The clamping assembly (2) further comprises a third clamping device (204) and a third driving device (205) for driving the third clamping device (204) to clamp forwardly and backwardly.

10. A cutting machine characterized by, The machine comprises a frame, a driving module, a guide rail and a feeding device as claimed in any one of claims 1-9, the feeding device being in sliding connection with the guide rail, the driving module being in transmission connection with the feeding device, and the driving module driving the feeding device to reciprocate along the length direction of the guide rail.

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