Grinding wheel mechanism of a knife sharpener

Abstract

The application relates to a grinding wheel mechanism of a knife grinder, and belongs to the technical field of knife grinding. The grinding wheel mechanism of the knife grinder comprises a mounting seat, a mounting cover, a grinding wheel mounting shaft, a disc-shaped grinding wheel, a double-sided convex grinding wheel, a first wear detection assembly and a second wear detection assembly. The mounting seat is movably arranged on the body of the knife grinder. The mounting cover is arranged on the mounting seat. The first wear detection assembly is arranged in the mounting cover and is used for detecting the wear condition of the disc-shaped grinding wheel. The second wear detection assembly is arranged in the mounting cover and is used for detecting the wear condition of the double-sided convex grinding wheel. The application has the advantages that the operator can timely find the excessive wear condition of the disc-shaped grinding wheel or the double-sided convex grinding wheel, and the subsequent machining quality and precision are ensured to a certain extent.

Description

Technical Field

[0001] This application relates to the field of tool sharpening technology, and in particular to a grinding wheel mechanism for a tool sharpening machine. Background Technology

[0002] A tool grinding machine is a device used to grind metal cutting tools such as lathe tools and milling cutters. It mainly includes a grinding wheel mechanism, a tool clamping mechanism, and a control system. Among them, the grinding wheel mechanism, as the component that directly contacts the tool, is responsible for grinding the cutting edge of the tool.

[0003] In related technologies, the grinding wheel mechanism of a knife sharpening machine includes a mounting base, a grinding power source, a grinding wheel mounting shaft, a disc grinding wheel, and a double-sided convex grinding wheel. The mounting base is movably mounted on the body of the knife sharpening machine as needed. The grinding power source is mounted on the mounting base, and the grinding wheel mounting shaft is connected to the output end of the grinding power source. Both the disc grinding wheel and the double-sided convex grinding wheel are fixedly sleeved on the grinding wheel mounting shaft, with a certain gap between them. In use, the grinding power source drives the disc grinding wheel and the double-sided convex grinding wheel to rotate via the grinding wheel mounting shaft. The tool clamping mechanism drives the end face of the tool to contact the disc grinding wheel, thereby achieving grinding of the tool end face. The double-sided convex grinding wheel contacts the groove at the end of the tool, enabling grinding of the tool groove.

[0004] Regarding the aforementioned technologies, disc grinding wheels and double-sided convex grinding wheels are prone to excessive wear during long-term use, which operators often fail to detect in time, leading to a reduction in subsequent processing quality and precision. Utility Model Content

[0005] To facilitate operators in timely detection of excessive wear on disc grinding wheels or double-sided convex grinding wheels, and to a certain extent ensure the quality and precision of subsequent processing, this application provides a grinding wheel mechanism for a knife grinding machine.

[0006] The grinding wheel mechanism of the knife sharpening machine provided in this application adopts the following technical solution: A grinding wheel mechanism for a knife sharpening machine includes: Mounting base, which is movably mounted on the body of the grinding machine; Mounting cover, which is disposed on the mounting base; A grinding wheel mounting shaft is rotatably mounted on a mounting cover for connection to a power source; A disc grinding wheel, wherein the disc grinding wheel is sleeved on a grinding wheel mounting shaft; A double-sided convex grinding wheel, wherein the double-sided convex grinding wheel is sleeved on a grinding wheel mounting shaft; The first wear detection component is disposed inside the mounting cover and is used to detect the wear condition of the disc grinding wheel; The second wear detection component is installed inside the mounting cover and is used to detect the wear condition of the double-sided convex grinding wheel.

[0007] Preferably, both the first wear detection component and the second wear detection component include a bracket disposed within a mounting cover, multiple detection rods slidably passing through the bracket, an elastic element disposed on the bracket, and a movable detection element disposed within the mounting cover. In the first wear detection component, the sliding direction of the detection rods is perpendicular to the rotation axis of the disc grinding wheel, and in the second wear detection component, the sliding direction of the detection rods is perpendicular to the grinding surface of the double-sided convex grinding wheel. The multiple detection rods in the first wear detection component are used to abut against the outer surface of the disc grinding wheel, and the multiple detection rods in the second wear detection component are used to abut against the grinding surface of the double-sided convex grinding wheel. The elastic element is used to ensure that the corresponding detection rod always has a tendency to move towards the corresponding disc grinding wheel or double-sided convex grinding wheel. The movable detection element is used to measure the displacement change of the corresponding detection rod.

[0008] Preferably, the elastic element includes a first spring, which corresponds one-to-one with the detection rod. One end of the first spring is disposed on the corresponding bracket, and the other end is disposed on the corresponding detection rod.

[0009] Preferably, the moving detection component includes a sliding block and a displacement sensor. The sliding block is slidably disposed inside the mounting cover or on a corresponding bracket. The displacement sensor is disposed on the corresponding sliding block, mounting cover, or corresponding bracket and is used to measure the displacement change of the corresponding sliding block and send it to an external control platform. Each detection rod is connected to the corresponding sliding block by a connecting rope. When any detection rod in the first wear detection component or the second wear detection component moves toward the direction close to the corresponding disc grinding wheel or double-sided convex grinding wheel, the detection rod pulls the corresponding sliding block to move through the connecting rope.

[0010] Preferably, the mounting cover is provided with a second spring, which corresponds one-to-one with the sliding block. The second spring is used to pull the sliding block to move away from the corresponding detection rod, and the elastic force of the first spring is greater than that of the second spring.

[0011] Preferably, a guide wheel is installed inside the mounting cover, and the guide wheel corresponds one-to-one with the connecting rope. The connecting rope between the detection rod and the corresponding sliding block is slidably connected to the corresponding guide wheel, and the extension directions of the two ends of the connecting rope slidably connected to the guide wheel are perpendicular to each other.

[0012] Preferably, each of the detection rods is rotatably mounted with ball bearings, which are used to abut against the corresponding disc grinding wheel or double-sided convex grinding wheel.

[0013] Preferably, a chip-proof curtain is provided on the mounting cover, and the first wear detection component and the second wear detection component are both located in the space enclosed by the mounting cover and the chip-proof curtain. The positions of the corresponding tools on the disc grinding wheel and the double-sided convex grinding wheel are located outside the chip-proof curtain.

[0014] In summary, this application includes the following beneficial technical effects: During operation, the power source drives the disc grinding wheel and the double-sided convex grinding wheel to rotate via the grinding wheel mounting shaft. The tool clamping mechanism on the grinding machine moves the tool, such as moving the end face of the milling cutter to contact the grinding surface of the disc grinding wheel or the double-sided convex grinding wheel for grinding. During this process, the wear condition of the disc grinding wheel is detected by the first wear detection component, and the wear condition of the double-sided convex grinding wheel is detected by the second wear detection component. This helps the operator to detect excessive wear on the disc grinding wheel and the double-sided convex grinding wheel in a timely manner, so that the operator can replace the disc grinding wheel and / or the double-sided convex grinding wheel in a timely manner, thereby ensuring the quality and accuracy of subsequent processing to a certain extent. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0016] Figure 2 This is a partial structural diagram of an embodiment of this application.

[0017] Figure 3 This is a partial structural cross-sectional view of an embodiment of this application.

[0018] Figure 4 yes Figure 3 Enlarged view of part A in the middle.

[0019] Explanation of reference numerals in the attached drawings: 1. Mounting base; 2. Mounting cover; 3. Grinding wheel mounting shaft; 4. Disc grinding wheel; 5. Double-sided convex grinding wheel; 6. Bracket; 7. Detection rod; 8. First spring; 9. Sliding block; 10. Connecting rope; 11. Second spring; 12. Guide wheel; 13. Ball bearing; 14. Chip guard; 15. Power source; 16. Opening. Detailed Implementation

[0020] The following combination Figures 1-4 This application will be described in further detail.

[0021] This application discloses a grinding wheel mechanism for a knife sharpening machine. (Refer to...) Figure 1The grinding wheel mechanism of the knife sharpening machine includes a mounting base 1, a power source 15, a mounting cover 2, a grinding wheel mounting shaft 3, a disc grinding wheel 4, a double-sided convex grinding wheel 5, a first wear detection component, and a second wear detection component. The mounting base 1 is movably mounted on the body of the knife sharpening machine. Specifically, the mounting base 1 can be slidably mounted on the body of the knife sharpening machine along multiple degrees of freedom as needed, driven by a cylinder, electric cylinder, or other driving component. The movability and driving method of the mounting base 1 are existing technologies and will not be elaborated upon here. The mounting cover 2 is fixedly mounted on the mounting base 1, and the power source 15 is also fixedly mounted on the mounting base 1. The mounting cover 2 is fixedly connected to the housing of the power source 15. In this application, the power source 15 can be either a servo motor or a stepper motor, without limitation. The grinding wheel mounting shaft 3 is rotatably mounted on the mounting cover 2 via bearings, and the grinding wheel mounting shaft 3 is coaxially and fixedly connected to the output shaft of the power source 15.

[0022] Reference Figure 1 and Figure 2 Both the disc grinding wheel 4 and the double-sided convex grinding wheel 5 are fixedly mounted on the grinding wheel mounting shaft 3 via flanges, with a certain gap between them. Specifically, the disc grinding wheel 4 is located on the side of the double-sided convex grinding wheel 5 closer to the power source 15, and the mounting cover 2 covers the upper ends of both the disc grinding wheel 4 and the double-sided convex grinding wheel 5. The thickness of the disc grinding wheel 4 is greater than that of the double-sided convex grinding wheel 5. The grinding surface of the disc grinding wheel 4 is the radially outer wall surface, while the grinding surface of the double-sided convex grinding wheel 5 is the axially two side surfaces. The grinding surface of the double-sided convex grinding wheel 5 can be divided into a conical surface and a flat surface as needed.

[0023] Reference Figure 1 and Figure 2 The first wear detection component and the second wear detection component are both installed inside the mounting cover 2. The first wear detection component is used to detect the wear of the disc grinding wheel 4, and the second wear detection component is used to detect the wear of the double-sided convex grinding wheel 5. Both the first wear detection component and the second wear detection component are electrically connected to the external control platform.

[0024] During operation, the power source 15 drives the disc grinding wheel 4 and the double-sided convex grinding wheel 5 to rotate via the grinding wheel mounting shaft 3. The tool clamping mechanism on the grinding machine moves the tool, such as moving the end face of the milling cutter to contact the disc grinding wheel 4, or making the groove on the end face of the milling cutter contact the grinding surface of the double-sided convex grinding wheel 5 for grinding. During this process, the wear condition of the disc grinding wheel 4 is detected by the first wear detection component, and the wear condition of the double-sided convex grinding wheel 5 is detected by the second wear detection component. When the first wear detection component and / or the second wear detection component detects excessive wear of the corresponding disc grinding wheel 4 or double-sided convex grinding wheel 5, the operator is promptly notified through the external control platform. This helps the operator to promptly detect the excessive wear of the disc grinding wheel 4 and the double-sided convex grinding wheel 5, facilitating the replacement or other treatment of the disc grinding wheel 4 and / or the double-sided convex grinding wheel 5, thereby ensuring the quality and accuracy of subsequent processing to a certain extent.

[0025] Reference Figure 3 and Figure 4 To facilitate the detection of wear on the disc grinding wheel 4 and the double-sided convex grinding wheel 5, both the first and second wear detection components include a bracket 6, a detection rod 7, an elastic element, and a movable detection element. The bracket 6 is fixedly installed inside the mounting cover 2 and is located above the corresponding disc grinding wheel 4 or double-sided convex grinding wheel 5. Furthermore, since the double-sided convex grinding wheel 5 has two grinding surfaces, the second wear detection component has two brackets 6, which are located on both sides of the double-sided convex grinding wheel 5.

[0026] Reference Figure 3 and Figure 4 The detection rod 7 is slidably mounted on the corresponding bracket 6. Specifically, multiple detection rods 7 are slidably mounted on each bracket 6. The arrangement direction of the multiple detection rods 7 in the first wear detection assembly is parallel to the axial direction of the grinding wheel mounting shaft 3. The sliding direction of the detection rods 7 in the first wear detection assembly is perpendicular to the rotation axis of the disc grinding wheel 4. The sliding direction of the detection rods 7 in the second wear detection assembly is perpendicular to the corresponding grinding surface of the double-sided convex grinding wheel 5. The multiple first detection rods 7 in the first wear detection assembly are used to abut against the outer surface of the disc grinding wheel 4. The multiple detection rods 7 on the bracket 6 in the second wear detection assembly are used to abut against the corresponding grinding surface of the double-sided convex grinding wheel 5. In order to reduce the wear between the disc grinding wheel 4 and the double-sided convex grinding wheel 5 and the detection rod 7 during rotation, a ball bearing 13 is rolled at the end of the detection rod 7. The ball bearing 13 is used to abut against the surface of the corresponding disc grinding wheel 4 or double-sided convex grinding wheel 5.

[0027] Reference Figure 3 and Figure 4The elastic element is mounted on the bracket 6. The elastic element is used to make the corresponding detection rod 7 always tend to move towards the corresponding disc grinding wheel 4 or double-sided convex grinding wheel 5. The moving detection element is mounted inside the mounting cover 2. The moving detection element is used to measure the displacement change of the corresponding detection rod 7. The moving detection element is electrically connected to the external control platform.

[0028] When the disc grinding wheel 4 or the double-sided convex grinding wheel 5 becomes excessively worn, the corresponding detection rod 7 will move towards the corresponding disc grinding wheel 4 or the double-sided convex grinding wheel 5 under the action of the elastic element. The displacement change of the corresponding detection rod 7 is detected by the moving detection element and sent to the external control platform, so as to promptly prompt the operator to carry out subsequent processing to ensure processing quality and accuracy.

[0029] Reference Figure 3 and Figure 4 To ensure that the corresponding detection rod 7 always tends to move towards the corresponding disc grinding wheel 4 or double-sided convex grinding wheel 5, the elastic element includes a first spring 8. The first spring 8 corresponds one-to-one with the detection rod 7. The first spring 8 is movably sleeved on the side of the corresponding detection rod 7 away from the corresponding grinding surface. One end of the first spring 8 is fixedly mounted on the corresponding bracket 6, and the other end is fixedly mounted on the corresponding detection rod 7. When the ball 13 on the detection rod 7 abuts against the corresponding disc grinding wheel 4 or double-sided convex grinding wheel 5, the first spring 8 is always in a stretched state.

[0030] Reference Figure 3 and Figure 4 To facilitate the detection of displacement changes of the detection rod 7, the movable detection component includes a sliding block 9 and a displacement sensor (not shown in the figure). The sliding block 9 corresponds one-to-one with the bracket 6. The sliding block 9 is slidably mounted on the inner wall of the mounting cover 2 or on the corresponding bracket 6. Specifically, the sliding block 9 in the first wear detection assembly is slidably mounted on the inner wall of the mounting cover 2 via a guide rail, while one sliding block 9 in the second wear detection assembly is slidably mounted on the inner wall of the mounting cover 2 via a guide rail, and the other sliding block 9 is slidably mounted on the corresponding bracket 6 via a guide rail. The sliding direction of each sliding block 9 is perpendicular to the sliding direction of the corresponding detection rod 7. Each detection rod 7 on the bracket 6 is fixedly connected to the corresponding sliding block 9 by a non-elastic connecting rope 10. The sliding block 9 is located on the same side of the multiple detection rods 7 on the corresponding bracket 6. Reference Figure 3 and Figure 4Each displacement sensor corresponds to a sliding block 9. The displacement sensor is installed on the corresponding sliding block 9, the inner wall of the mounting cover 2, or the corresponding bracket 6. The displacement sensor is used to electrically connect to the external control platform. The displacement sensor is used to measure the displacement change of the corresponding sliding block 9 and send it to the external control platform. Specifically, the installation position of the displacement sensor is designed according to the type of displacement sensor. For example, if a contact displacement sensor is used, the displacement sensors can all be installed on the corresponding sliding block 9, and the probe of the displacement sensor abuts against the inner wall of the mounting cover 2 or the corresponding bracket 6.

[0031] Reference Figure 3 and Figure 4 When any of the detection rods 7 in the first wear detection assembly or the second wear detection assembly moves toward the corresponding disc grinding wheel 4 or double-sided convex grinding wheel 5, the detection rod 7 pulls the corresponding sliding block 9 to move via the connecting rope 10, so that the operator can be promptly alerted when there is excessive wear at any position on the grinding surface of the disc grinding wheel 4 or the double-sided convex grinding wheel 5.

[0032] Reference Figure 3 and Figure 4 To ensure the positional stability of the sliding block 9 when the detection rod 7 is not moved, a second spring 11 is fixedly installed on the mounting cover 2 or the bracket 6. The second spring 11 corresponds to the sliding block 9 one by one. The second spring 11 is used to pull the corresponding sliding block 9 to move away from the corresponding detection rod 7. One end of the second spring 11 is fixed on the side of the corresponding sliding block 9 away from the detection rod 7, and the other end is fixed on the mounting cover 2 or the corresponding bracket 6. The elastic force of the first spring 8 is greater than the elastic force of the second spring 11.

[0033] The position of the sliding block 9 is limited by the pulling action of the second spring 11 and the connecting rope 10. When the detection rod 7 moves toward the direction of the corresponding disc grinding wheel 4 or double-sided convex grinding wheel 5, the sliding block 9 will be moved by the connecting rope 10 because the elastic force of the first spring 8 is greater than that of the second spring 11.

[0034] Reference Figure 3 and Figure 4 Guide wheels 12 are installed inside the mounting cover 2 or on the bracket 6. The guide wheels 12 correspond one-to-one with the connecting ropes 10. The connecting ropes 10 between the detection rod 7 and the corresponding sliding block 9 are slidably overlapped on the corresponding guide wheels 12. The extension directions of the connecting ropes 10 on both sides of the guide wheels 12 are perpendicular to each other. The setting of the guide wheels 12 can guide the connecting ropes 10 so that multiple connecting ropes 10 will not get tangled.

[0035] Reference Figure 1 and Figure 2The mounting cover 2 has an opening 16 on the side near the tool. A chip guard 14 is fixedly bonded to the mounting cover 2. The chip guard 14 is located at the opening 16 of the mounting cover 2. The chip guard 14 includes multiple flexible belts, which are in contact with the surfaces of the disc grinding wheel 4 and the double-sided convex grinding wheel 5. The first wear detection component and the second wear detection component are located in the space enclosed by the mounting cover 2 and the chip guard 14. The positions of the disc grinding wheel 4 and the double-sided convex grinding wheel 5 corresponding to the tool are located outside the chip guard 14, so that the tool is located outside the chip guard 14 when it is being ground.

[0036] The chip curtain 14 can prevent machining chips from entering the mounting cover 2 and inhibit the adhesion of machining chips to the disc grinding wheel 4 and the double-sided convex grinding wheel 5, thereby reducing the impact on the detection of the first wear detection component and the second wear detection component.

[0037] The implementation principle of this application embodiment is as follows: During operation, the power source 15 drives the disc grinding wheel 4 and the double-sided convex grinding wheel 5 to rotate via the grinding wheel mounting shaft 3. The tool clamping mechanism on the grinding machine drives the tool to approach the disc grinding wheel 4 or the double-sided convex grinding wheel 5, such as driving the end face of the milling cutter to contact the disc grinding wheel 4, or driving the groove on the end face of the milling cutter to contact the grinding surface of the double-sided convex grinding wheel 5, so as to realize the grinding operation. During this process, the ball 13 on the detection rod 7 is always in contact with the grinding surface of the corresponding grinding wheel. When the disc grinding wheel 4 or the double-sided convex grinding wheel 5 is excessively worn, when the ball 13 of the detection rod 7 contacts the excessively worn area, the detection rod 7 will... The probe 7 moves toward the corresponding disc grinding wheel 4 or double-sided convex grinding wheel 5. The movement of any of the detection rods 7 will pull the corresponding sliding block 9 to move via the connecting rope 10. The displacement change of the sliding block 9 is detected by the displacement sensor and sent to the external control platform. When the external control platform receives the displacement change of the sliding block 9 exceeding the preset range, it will alert the operator. This helps the operator to detect the excessive wear of the disc grinding wheel 4 and the double-sided convex grinding wheel 5 in a timely manner, making it convenient for the operator to replace the disc grinding wheel 4 and / or the double-sided convex grinding wheel 5 or perform other treatments, thus ensuring the quality and accuracy of subsequent processing to a certain extent.

[0038] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A grinding wheel mechanism for a knife sharpening machine, characterized in that, include: Mounting base (1), which is movably mounted on the body of the grinding machine; Mounting cover (2), which is disposed on mounting base (1); A grinding wheel mounting shaft (3) is rotatably mounted on a mounting cover (2) for connection to a power source (15); A disc grinding wheel (4) is sleeved on a grinding wheel mounting shaft (3); A double-sided convex grinding wheel (5) is sleeved on the grinding wheel mounting shaft (3); The first wear detection component is installed inside the mounting cover (2) and is used to detect the wear of the disc grinding wheel (4); The second wear detection component is installed inside the mounting cover (2) and is used to detect the wear of the double-sided convex grinding wheel (5).

2. The grinding wheel mechanism of a knife sharpening machine according to claim 1, characterized in that: Both the first wear detection assembly and the second wear detection assembly include a bracket (6) disposed within a mounting cover (2), multiple detection rods (7) slidably passing through the bracket (6), an elastic element disposed on the bracket (6), and a movable detection element disposed within the mounting cover (2). In the first wear detection assembly, the sliding direction of the detection rods (7) is perpendicular to the rotation axis of the disc grinding wheel (4), and in the second wear detection assembly, the sliding direction of the detection rods (7) is perpendicular to the grinding surface of the double-sided convex grinding wheel (5). The multiple detection rods (7) in the first wear detection assembly are used to abut against the outer surface of the disc grinding wheel (4), and the multiple detection rods (7) in the second wear detection assembly are used to abut against the grinding surface of the double-sided convex grinding wheel (5). The elastic element is used to make the corresponding detection rod (7) always have a tendency to move towards the corresponding disc grinding wheel (4) or double-sided convex grinding wheel (5). The movable detection element is used to measure the displacement change of the corresponding detection rod (7).

3. The grinding wheel mechanism of a knife sharpening machine according to claim 2, characterized in that: The elastic element includes a first spring (8), which corresponds one-to-one with the detection rod (7). One end of the first spring (8) is set on the corresponding bracket (6), and the other end is set on the corresponding detection rod (7).

4. The grinding wheel mechanism of a knife sharpening machine according to claim 3, characterized in that: The moving detection component includes a sliding block (9) and a displacement sensor. The sliding block (9) is slidably disposed inside the mounting cover (2) or on the corresponding bracket (6). The displacement sensor is disposed on the corresponding sliding block (9), the mounting cover (2) or the corresponding bracket (6) and is used to measure the displacement change of the corresponding sliding block (9) and send it to the external control platform. Each detection rod (7) is connected to the corresponding sliding block (9) by a connecting rope (10). When any detection rod (7) in the first wear detection component or the second wear detection component moves toward the corresponding disc grinding wheel (4) or double-sided convex grinding wheel (5), the detection rod (7) pulls the corresponding sliding block (9) to move through the connecting rope (10).

5. The grinding wheel mechanism of a knife sharpening machine according to claim 4, characterized in that: The mounting cover (2) is provided with a second spring (11), which corresponds one-to-one with the sliding block (9). The second spring (11) is used to pull the sliding block (9) to move away from the corresponding detection rod (7). The elastic force of the first spring (8) is greater than that of the second spring (11).

6. The grinding wheel mechanism of a knife sharpening machine according to claim 4, characterized in that: The mounting cover (2) is equipped with guide wheels (12), and the guide wheels (12) correspond one-to-one with the connecting ropes (10). The connecting ropes (10) between the detection rod (7) and the corresponding sliding block (9) are slidably connected to the corresponding guide wheels (12). The extension directions of the two ends of the connecting ropes (10) slidably connected to the guide wheels (12) are perpendicular to each other.

7. The grinding wheel mechanism of a knife sharpening machine according to claim 2, characterized in that: Each of the detection rods (7) is equipped with a ball bearing (13) that is used to abut against the corresponding disc grinding wheel (4) or double-sided convex grinding wheel (5).

8. The grinding wheel mechanism of a knife sharpening machine according to any one of claims 1-7, characterized in that: A chip filter curtain (14) is provided on the mounting cover (2). The first wear detection component and the second wear detection component are both located in the space enclosed by the mounting cover (2) and the chip filter curtain (14). The positions of the corresponding tools on the disc grinding wheel (4) and the double-sided convex grinding wheel (5) are located outside the chip filter curtain (14).

Images