Manual laser lamp demonstration device

Abstract

The utility model discloses a manual laser lamp demonstration device, which comprises a protective cover, a fixed plate, a first hand wheel, a second hand wheel, a horizontal rotating assembly, a first synchronous belt, a vertical rotating assembly, a second synchronous belt and a laser lamp, and is characterized in that the fixed plate is transversely and fixedly connected inside the protective cover, and the first hand wheel and the second hand wheel are arranged on the protective cover in parallel; a rotating shaft of the first hand wheel and a rotating shaft of the second hand wheel penetrate through the protective cover to be rotationally connected to the fixing plate, the horizontal rotating assembly is vertically and fixedly connected to one end of the fixing plate, the horizontal rotating assembly and the first hand wheel are connected through a first synchronous belt, and the vertical rotating assembly is arranged in the horizontal rotating assembly and connected to the horizontal rotating assembly; and the vertical rotating assembly is connected with the second hand wheel through the second synchronous belt, the laser lamp is connected to the vertical rotating assembly, and the laser lamp can be effectively controlled to conduct corresponding horizontal and angle adjustment through rotation of the first hand wheel and the second hand wheel instead of an electric control handle.

Description

Technical Field

[0001] The utility model relates to the technical field of projection equipment, in particular to a manual laser light demonstration device. Background Art

[0002] In interactive devices or demonstration devices using laser lights, the light angle of the laser light is generally adjusted by turning an electric control handle. However, the electric control handle has a high failure rate and a short service life. After some devices use the electric control handle, the laser light has a lagging action and the user experience is poor. Utility Model Content

[0003] The utility model aims to overcome the shortcomings of the prior art, such as high failure rate and short service life of the electric control handle, and the lagging action of the laser light and poor user experience after some equipment adopts the electric control handle.

[0004] A manual laser light demonstration device is proposed, comprising a protective cover, a fixed plate for installation, a first hand wheel for adjusting the horizontal swing angle position of the laser light, a second hand wheel for adjusting the vertical pitch angle position of the laser light, a horizontal rotation component for driving the laser light to swing horizontally, a first synchronous belt for assisting the horizontal rotation component in adjustment, a vertical rotation component for driving the laser light to rotate at a pitch angle, a second synchronous belt for assisting the vertical rotation component in adjustment, and a laser light, wherein the fixed plate is laterally fixedly connected to the inside of the protective cover, the first hand wheel and the second hand wheel are arranged on the protective cover in parallel with each other, and the rotating axes of the first hand wheel and the second hand wheel pass through the protective cover and are rotatably connected to the fixed plate, the horizontal rotation component is vertically arranged at one end of the fixed plate and fixedly connected to the fixed plate, and the horizontal rotation component is connected to the first hand wheel by a first synchronous belt, the vertical rotation component is arranged inside the horizontal rotation component and fixedly connected to the horizontal rotation component, and the vertical rotation component and the second hand wheel are also connected by a second synchronous belt, and the laser light is fixedly connected to the vertical rotation component.

[0005] In the technical solution of the utility model, when the first hand wheel rotates forward, the first hand wheel will drive the first synchronous belt wheel to rotate clockwise through the second synchronous belt wheel using the first synchronous belt. The first synchronous belt wheel will drive the laser light frame and the laser light of the vertical rotating component to rotate horizontally according to the rotation direction of the first hand wheel through the first rotating shaft. Conversely, when the first hand wheel is rotated counterclockwise, the laser light will also rotate horizontally along with the laser light frame and the counterclockwise rotation direction of the first hand wheel. When the pitch angle of the laser light needs to be adjusted, only the second hand wheel needs to be rotated. When the second hand wheel rotates clockwise, the second hand wheel will synchronously drive the third synchronous belt wheel and the main gear to rotate clockwise through the fourth synchronous belt wheel, and the second rotating shaft will rotate counterclockwise together with the driving wheel driven by the secondary gear. At this time, the third rotating shaft rotates forward driven by the driven wheel, and the lens part of the laser light will also rotate downward driven by the third rotating shaft. Conversely, when the second hand wheel rotates counterclockwise, the lens part of the laser light will also be lifted upward driven by the third rotating shaft.

[0006] It is used to solve the shortcomings of high failure rate and short service life of the electric control handle mentioned in the technical background, and the lagging action of the laser light and poor user experience after some equipment uses the electric control handle.

[0007] Preferably, the first synchronous belt and the second synchronous belt are both synchronous belts, which have good elasticity and toughness, so that the synchronous belts can withstand greater impact and pressure, adapt to different working conditions, maintain stable performance in high-speed or low-speed operation, and the synchronous belts have sensitive braking. When emergency braking is required, the synchronous belts can respond quickly and provide strong braking force.

[0008] Preferably, a light-transmitting hole is provided on the protective cover at the position of the horizontal rotating assembly. After the laser lamp is turned on, the light beam generated by the laser lamp can be emitted to the outside of the protective cover through the light-transmitting hole for identifying a target or for demonstration.

[0009] In the preferred embodiment of the technical solution of the utility model, the horizontal rotation component includes a support frame, a first rotating shaft, a first synchronous belt pulley and a second synchronous belt pulley. The support frame is vertically arranged at one end of a fixed plate and fixedly connected to the fixed plate. The vertical rotation component is rotatably connected to the inside of the support frame. The first rotating shaft is vertically arranged at the center position of the bottom of the laser light frame of the vertical rotation component, and the bottom end of the first rotating shaft is rotatably connected to the fixed plate. The top of the first rotating shaft is fixedly connected to the laser light frame. The first synchronous belt pulley is horizontally sleeved on the first rotating shaft, and the second synchronous belt pulley is horizontally sleeved on the rotating shaft of the first hand wheel. The first synchronous belt pulley and the second synchronous belt pulley have the same height and the first synchronous belt is sleeved on the first synchronous belt pulley and the second synchronous belt pulley. When the first hand wheel rotates, it will drive the first synchronous belt pulley to rotate through the second synchronous belt pulley using the first synchronous belt, and when the first synchronous belt pulley rotates, it will drive the laser light frame to rotate synchronously, and the rotation direction of the laser light frame is the same as the rotation direction of the first hand wheel. The laser light is arranged inside the laser light frame, so when the laser light frame rotates, it will synchronously drive the laser light to swing horizontally.

[0010] In the preferred embodiment of the technical solution of the utility model, the vertical rotation assembly includes a laser light frame, a main gear, a second rotating shaft, a sub-gear, a third synchronous pulley, a driving wheel, a driven wheel, a third rotating shaft and a fourth synchronous pulley. The laser light frame is vertically arranged inside the support frame, the main gear is laterally rotatably connected to the center position above the laser light frame, the second rotating shaft is vertically rotatably connected to one side of the main gear, the sub-gear is laterally sleeved on the top of the second rotating shaft, and the sub-gear and the main gear are meshed with each other, the third synchronous pulley is laterally arranged above the main gear, and the third synchronous pulley is fixedly connected to the main gear, the bottom end of the second rotating shaft passes through the laser light frame and is fixedly connected to the driving wheel, the third rotating shaft is laterally rotatably connected to the inside of the laser light frame and the third rotating shaft is located below the driving wheel, and the driven wheel is located below the driving wheel. The fourth synchronous belt pulley is horizontally sleeved on the rotating shaft of the second hand wheel, and the third synchronous belt pulley and the fourth synchronous belt pulley have the same height and the second synchronous belt is sleeved on the third synchronous belt pulley and the fourth synchronous belt pulley. The second hand wheel will use the fourth synchronous belt pulley to synchronously drive the third synchronous belt pulley and the main gear to rotate clockwise, and the second rotating shaft will rotate reversely together with the driving wheel driven by the sub gear. At this time, the third rotating shaft rotates forward driven by the driven wheel, and the lens part of the laser lamp will also rotate downward driven by the third rotating shaft. Conversely, when the second hand wheel rotates counterclockwise, the lens part of the laser lamp will also be lifted upward driven by the third rotating shaft.

[0011] Preferably, the driving wheel and the driven wheel are bevel gears, and the outer covers of the driving wheel and the driven wheel are provided with a box body, which has the function of protecting the driving wheel and the driven wheel and can effectively prevent dust, water and other corrosive substances from contacting the driving wheel and the driven wheel.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] The utility model provides a laser light control mechanism, which uses a first hand wheel and a second hand wheel to respectively use a horizontal rotation component and a vertical rotation component to control the horizontal swing and vertical swing of the laser light. The utility model has simple operation, stable structure, long service life, and no lag in action, and can effectively replace the electric control handle to control the laser light to perform corresponding horizontal position adjustment and pitch angle adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a three-dimensional structural diagram of a manual laser light demonstration device;

[0015] Figure 2 A schematic diagram of the internal structure of a manual laser light demonstration device (the protective cover is a whole, and a piece is removed to show the internal structure.);

[0016] Figure 3 A schematic diagram of the coordination of the first hand wheel and the second hand wheel with the vertical rotation component and the horizontal rotation component of a manual laser light demonstration device (the first hand wheel and the second hand wheel are a whole, and a piece is removed to show the internal structure.);

[0017] Figure 4 This is a schematic diagram of the horizontal rotation component structure of a manual laser light demonstration device (the support frame is a whole, and a piece is removed to show the internal structure.);

[0018] Figure 5 A schematic diagram of the structure of a vertical rotating component of a manual laser light demonstration device;

[0019] In the figure: 1-protective cover, 11-light transmission hole, 2-fixed plate, 3-first hand wheel, 4-second hand wheel, 5-horizontal rotation assembly, 51-support frame, 52-first rotating shaft, 53-first synchronous pulley, 54-second synchronous pulley, 6-first synchronous belt, 7-vertical rotation assembly, 71-laser light frame, 72-main gear, 73-second rotating shaft, 74-sub gear, 75-third synchronous pulley, 76-driving wheel, 77-driven wheel, 78-third rotating shaft, 79-fourth synchronous pulley, 8-second synchronous belt, 9-laser light. DETAILED DESCRIPTION

[0020] The following will be combined with the attached embodiment of the present utility model Figure 1-5, the technical solutions in the embodiments of the utility model are described in detail.

[0021] like Figure 1-2 As shown, a manual laser lamp 9 demonstration device includes a protective cover 1 and a fixed plate 2, the fixed plate 2 is horizontally arranged inside the protective cover 1 and fixedly connected to the side plate of the protective cover 1, the first hand wheel 3 and the second hand wheel 4 are vertically arranged at the front end of the protective cover 1, the rotating shafts of the first hand wheel 3 and the second hand wheel 4 pass through the protective cover 1 and are rotatably connected to one end of the fixed plate 2, and the first hand wheel 3 and the second hand wheel 4 are parallel to each other, and a horizontal rotation component 5 for adjusting the horizontal position of the laser lamp 9 is vertically fixedly connected to the other end of the fixed plate 2, and the horizontal rotation component 5 and the first hand wheel 3 are connected by a first synchronous belt 6. Therefore, when it is necessary to adjust the horizontal swing position of the laser lamp 9 light beam, only the first hand wheel 3 needs to be rotated. When the first hand wheel 3 rotates, it can drive the horizontal rotation component 5 to rotate horizontally to the left and right through the first synchronous belt 6, and the horizontal height of the laser lamp 9 remains unchanged. When the horizontal rotation component 5 rotates horizontally to the left and right, it can drive the laser lamp 9 to swing horizontally.

[0022] like Figure 1-2 As shown, the vertical rotation component 7 for adjusting the pitch angle of the laser light 9 is arranged inside the horizontal rotation component 5, and the vertical rotation component 7 is connected to the second hand wheel 4 by the second synchronous belt 8. Therefore, when it is necessary to adjust the pitch angle of the laser light beam 9, it is only necessary to rotate the second hand wheel 4, and the second hand wheel 4 can drive the laser light 9 to adjust the pitch angle through the second synchronous belt 8 by using the vertical rotation component 7 when rotating. The laser light 9 is fixedly connected inside the vertical rotation component 7, and the back of the protective cover 1 is located at the position of the horizontal rotation component 5 to open a light hole 11 for passing the light beam generated when the laser light 9 is turned on. Therefore, after the laser light 9 is turned on, the light beam generated by the laser light 9 can pass through the light hole 11 for identifying the target or demonstrating. The first synchronous belt 6 and the second synchronous belt 8 are both synchronous belts. Therefore, when the first hand wheel 3 and the second hand wheel 4 are rotated, the horizontal rotation component 5 and the vertical rotation component 7 can be driven to rotate by the first synchronous belt 6 and the second synchronous belt 8.

[0023] like Figure 3-5As shown, the horizontal rotation assembly 5 includes a support frame 51, a first rotating shaft 52, a first synchronous pulley 53 and a second synchronous pulley 54. The support frame 51 is vertically arranged at one end of the fixed plate 2, and the vertical rotation assembly 7 is arranged inside the support frame 51. The first rotating shaft 52 is vertically arranged at the center position of the bottom of the laser light frame 71 of the vertical rotation assembly 7, and the bottom end of the first rotating shaft 52 is rotatably connected to the fixed plate 2, and the top end of the first rotating shaft 52 is fixedly connected to the laser light frame 71. Therefore, when the first rotating shaft 52 rotates, the first rotating shaft 52 will synchronously drive the laser light frame 71 to rotate. The light frame 71 rotates, and the first synchronous pulley 53 is horizontally arranged above the first rotating shaft 52 and fixedly connected to the first rotating shaft 52. Therefore, the rotation of the first synchronous pulley 53 will drive the first rotating shaft 52 to rotate. The second synchronous pulley 54 is mounted on the first hand wheel 3 and fixedly connected to the first hand wheel 3. Therefore, when the first hand wheel 3 rotates, it will drive the second synchronous pulley 54 to rotate, and the second synchronous pulley 54 has the same horizontal height as the first synchronous pulley 53. The first synchronous belt 6 is mounted on the first synchronous pulley 53 and the second synchronous pulley 54.

[0024] like Figure 3-5 As shown, when the horizontal position of the laser lamp 9 needs to be adjusted, it is only necessary to rotate the first hand wheel 3 clockwise or counterclockwise. When the first hand wheel 3 rotates, it will drive the first synchronous pulley 53 to rotate through the second synchronous belt 54 through the first synchronous belt 6 by friction. When the first synchronous belt 53 rotates, it will drive the laser lamp frame 71 of the vertical rotation component 7 to rotate through the first rotating shaft 52. The laser lamp 9 is fixedly connected to the vertical rotation component 7. Therefore, when the laser lamp frame 71 rotates, the laser lamp 9 will rotate synchronously with the laser lamp frame 71, and the direction of rotation of the laser lamp frame 71 is the same as the rotation direction of the first hand wheel 3. When the horizontal rotation component 5 rotates, the vertical rotation component 7 will not rotate. Therefore, when the laser lamp frame 71 rotates, the pitch angle of the laser lamp 9 will not change and it will only rotate horizontally following the laser lamp frame 71.

[0025] like Figure 3-5As shown, the vertical rotation assembly 7 includes a laser light frame 71, a main gear 72, a second rotating shaft 73, a sub-gear 74, a third synchronous pulley 75, a driving wheel 76, a driven wheel 77, a third rotating shaft 78 and a fourth synchronous pulley 79. The laser light frame 71 is vertically arranged inside the support frame 51. The laser light frame 71 is vertically arranged inside the support frame 51. The main gear 72 is horizontally rotationally connected to the center position above the laser light frame 71. The bottom end of the fixed shaft of the main gear 72 is fixedly connected to the center position of the top of the laser light frame 71. The top end of the fixed shaft of the main gear 72 is rotationally connected to the support frame 51 of the horizontal rotation assembly 5. Therefore, when the first synchronous pulley 53 rotates, the laser light frame 71 can be driven to rotate. The second rotating shaft 73 is vertically rotationally connected to one side of the main gear 72. The sub-gear 74 is horizontally sleeved on the top of the second rotating shaft 73, and the sub-gear 74 is meshed with the main gear 72.

[0026] like Figure 3-5 The third synchronous belt pulley 75 is arranged horizontally above the main gear 72, and the third synchronous belt pulley 75 is fixedly connected to the main gear 72. Therefore, when the third synchronous belt pulley 75 rotates, the third synchronous belt pulley 75 will synchronously drive the main gear 72 to rotate. The third rotating shaft 78 is laterally rotatably connected to the inside of the laser light frame 71 and the third rotating shaft 78 is located below the driving wheel 76. The driven wheel 77 is located below the driving wheel 76 and is laterally sleeved on the third rotating shaft 78. The driven wheel 77 is fixedly connected to the third rotating shaft 78.

[0027] like Figure 3-5 As shown, the driven wheel 77 and the driving wheel 76 are meshed with each other, so when the driving wheel 76 is driven by the second shaft 73 to rotate, the driving wheel 76 will synchronously drive the driven wheel 77 to rotate, and the driven wheel 77 will drive the third shaft 78 to rotate when rotating. The laser lamp 9 is fixedly connected to the third shaft 78, so when the driven wheel 77 drives the third shaft 78 to rotate, the third shaft 78 will synchronously drive the laser lamp 9 to rotate, and when the second hand wheel 4 rotates clockwise, it will synchronously drive the driven wheel 77 and the third shaft 78 to rotate forward. At this time, the lens part of the laser lamp 9 starts to rotate downward, conversely, when the second hand wheel 4 rotates counterclockwise, it will synchronously drive the driven wheel 77 and the third shaft 78 to rotate in the opposite direction. At this time, the lens part of the laser lamp 9 starts to rise upward, and the fourth synchronous pulley 79 is horizontally sleeved on the rotating shaft of the second hand wheel 4.

[0028] like Figure 3-5 As shown, the third synchronous pulley 75 has the same height as the fourth synchronous pulley 79 and the second synchronous belt 8 is sleeved on the third synchronous pulley 75 and the fourth synchronous pulley 79. Therefore, when the second hand wheel 4 rotates, the second hand wheel 4 will synchronously drive the third synchronous pulley 75 to rotate through the fourth synchronous pulley 79 using the second synchronous belt 8, and the third synchronous pulley 75 has the same rotation direction as the second hand wheel 4. The driving wheel 76 and the driven wheel 77 used are both bevel gears, and the driving wheel 76 and the driven wheel 77 are covered with a box.

[0029] The movement process of this embodiment: when it is necessary to adjust the horizontal angle of the laser light beam 9, it is only necessary to rotate the first hand wheel 3. When the first hand wheel 3 is rotated clockwise, the first hand wheel 3 will synchronously drive the first synchronous pulley 53 of the horizontal rotation component 5 to rotate clockwise through the second synchronous pulley 54 using the first synchronous belt 6. When the first synchronous pulley 53 rotates clockwise, it will drive the laser light frame 71 of the vertical rotation component 7 to rotate clockwise synchronously through the first rotating shaft 52. When the laser light frame 71 rotates clockwise, it will synchronously drive the laser light 9 to rotate horizontally according to the rotation direction of the first hand wheel 3. Conversely, when the first hand wheel 3 is rotated counterclockwise, the laser light 9 will also follow the laser light frame 71 and follow the counterclockwise rotation direction of the first hand wheel 3 to rotate horizontally.

[0030] When the pitch angle of the laser lamp 9 needs to be adjusted, it is only necessary to rotate the second hand wheel 4. When the second hand wheel 4 rotates clockwise, the second hand wheel 4 will synchronously drive the third synchronous pulley 75 and the main gear 72 to rotate clockwise through the fourth synchronous pulley 79 using the second synchronous belt 8, and the second rotating shaft 73 will rotate in the opposite direction together with the driving wheel 76 driven by the secondary gear 74. At this time, the third rotating shaft 78 rotates forward driven by the driven wheel 77, and the lens part of the laser lamp 9 will also rotate downward driven by the third rotating shaft 78. Conversely, when the second hand wheel 4 rotates counterclockwise, the lens part of the laser lamp 9 will also be lifted upward driven by the third rotating shaft 78.

[0031] The above embodiments are only for illustrating the technical idea of ​​the present utility model, and cannot be used to limit the protection scope of the present utility model. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A manual laser light demonstration device, characterized in that: The invention comprises a protective cover (1), a fixing plate (2) for installation, a first hand wheel (3) for adjusting the horizontal swing angle position of the laser light (9), a second hand wheel (4) for adjusting the vertical pitch angle position of the laser light (9), a horizontal rotation component (5) for driving the laser light (9) to swing horizontally, a first synchronous belt (6) for assisting the horizontal rotation component (5) to be adjusted, a vertical rotation component (7) for driving the laser light (9) to rotate the pitch angle, a second synchronous belt (8) for assisting the vertical rotation component (7) to be adjusted, and the laser light (9), wherein the fixing plate (2) is laterally fixedly connected to the inside of the protective cover (1), and the first hand wheel (3) and the second hand wheel (4) are parallel to each other. The first hand wheel (3) and the second hand wheel (4) are arranged on the protective cover (1), and the rotating shafts of the first hand wheel (3) and the second hand wheel (4) pass through the protective cover (1) and are rotatably connected to the fixed plate (2). The horizontal rotating assembly (5) is vertically arranged at one end of the fixed plate (2) and is fixedly connected to the fixed plate (2). The horizontal rotating assembly (5) and the first hand wheel (3) are connected by a first synchronous belt (6). The vertical rotating assembly (7) is arranged inside the horizontal rotating assembly (5) and is fixedly connected to the horizontal rotating assembly (5). The vertical rotating assembly (7) and the second hand wheel (4) are also connected by a second synchronous belt (8). The laser light (9) is fixedly connected to the vertical rotating assembly (7).

2. A manual laser light demonstration device according to claim 1, characterized in that: The first synchronous belt (6) and the second synchronous belt (8) are both synchronous belts.

3. A manual laser light demonstration device according to claim 1, characterized in that: The protective cover (1) is provided with a light-transmitting hole (11) at the location of the horizontal rotating component (5).

4. A manual laser light demonstration device according to claim 3, characterized in that: The horizontal rotation component (5) comprises a support frame (51), a first rotating shaft (52), a first synchronous belt pulley (53) and a second synchronous belt pulley (54); the support frame (51) is vertically arranged at one end of a fixed plate (2) and fixedly connected to the fixed plate (2); the vertical rotation component (7) is rotationally connected to the inside of the support frame (51); the first rotating shaft (52) is vertically arranged at the center position of the bottom of a laser light frame (71) of the vertical rotation component (7); the bottom end of the first rotating shaft (52) is rotationally connected to the fixed plate (2); the top end of the first rotating shaft (52) is fixedly connected to the laser light frame (71); the first synchronous belt pulley (53) is transversely sleeved on the first rotating shaft (52); the second synchronous belt pulley (54) is transversely sleeved on the rotating shaft of the first hand wheel (3); the first synchronous belt pulley (53) and the second synchronous belt pulley (54) have the same height; and the first synchronous belt (6) is sleeved on the first synchronous belt pulley (53) and the second synchronous belt pulley (54).

5. A manual laser light demonstration device according to claim 4, characterized in that: The vertical rotation assembly (7) comprises a laser light frame (71), a main gear (72), a second rotating shaft (73), a sub-gear (74), a third synchronous pulley (75), a driving wheel (76), a driven wheel (77), a third rotating shaft (78) and a fourth synchronous pulley (79); the laser light frame (71) is vertically arranged inside the support frame (51); the main gear (72) is laterally rotatably connected to a central position above the laser light frame (71); the second rotating shaft (73) is vertically rotatably connected to one side of the main gear (72); the sub-gear (74) is laterally sleeved on the top of the second rotating shaft (73), and the sub-gear (74) and the main gear (72) are meshed with each other; the third synchronous pulley (75) is laterally arranged above the main gear (72), and the third synchronous pulley (75) is meshed with the main gear (72); The gear (72) is fixedly connected, the bottom end of the second rotating shaft (73) passes through the laser light frame (71) and is fixedly connected to a driving wheel (76), the third rotating shaft (78) is rotatably connected to the inside of the laser light frame (71) and the third rotating shaft (78) is located below the driving wheel (76), the driven wheel (77) is located below the driving wheel (76) and is laterally sleeved on the third rotating shaft (78), and the driven wheel (77) and the driving wheel (76) are meshed with each other, the laser light (9) is fixedly connected to the third rotating shaft (78), the fourth synchronous belt pulley (79) is laterally sleeved on the rotating shaft of the second hand wheel (4), the third synchronous belt pulley (75) and the fourth synchronous belt pulley (79) have the same height, and the second synchronous belt (8) is sleeved on the third synchronous belt pulley (75) and the fourth synchronous belt pulley (79).

6. A manual laser light demonstration device according to claim 5, characterized in that: The driving wheel (76) and the driven wheel (77) are both bevel gears, and a box body is provided outside the driving wheel (76) and the driven wheel (77).

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