Automatic cover folding and sealing machine

Abstract

The application discloses an automatic cover folding and carton sealing machine and relates to the technical field of carton sealing. The automatic cover folding and carton sealing machine comprises a device rack, a first device rack, a conveying unit, a folding unit and a carton sealing unit. The conveying unit is installed on the device rack. The folding unit is installed on one side of the first device rack. The carton sealing unit is installed on the other side of the first device rack. Second device racks are arranged at the two ends of the device rack. Platform plates are arranged in the second device racks. A moving mechanism is arranged between the second device racks and the platform plates. In the application, the platform plates and the rotating discs are horizontally displaced and rotated through the moving mechanism and the overturning mechanism. The platform plates and the rotating discs horizontally displace and overturn the cartons sealed in the middle part, change the positions of the cartons and overturn the edges of the cartons, make the four edges of the cover plates of the cartons correspond to the folding unit and the carton sealing unit, complete the back-to-back type sealing of the cartons, and thus the back-to-back type sealing of the cartons is conveniently realized, and the convenience of the back-to-back type sealing of the cartons is effectively improved.

Description

Technical Field

[0001] This invention relates to the field of carton sealing technology, specifically to an automatic folding and sealing machine. Background Technology

[0002] A carton sealing machine is a type of machinery used for sealing and packaging cartons. It can operate as a standalone machine or be used in conjunction with an assembly line. The sealing machine uses self-adhesive tape to seal the cartons, which is economical, fast, easy to adjust, and produces flat, standardized, and aesthetically pleasing seals. It can simultaneously seal both the top and bottom of the carton and is easily adjustable to accommodate cartons of different sizes. It is widely used in industries such as household appliances, textiles, food, department stores, pharmaceuticals, and chemicals.

[0003] However, existing automatic carton folding and sealing machines still have some problems:

[0004] Existing automatic folding and sealing machines can only seal the center of the carton lid when folding and sealing cartons. When some industries require sealing the four sides of the carton, existing automatic folding and sealing machines cannot do so, making sealing the four sides of the carton inconvenient. To address these issues, the inventor proposes an automatic folding and sealing machine. Summary of the Invention

[0005] In order to solve the problem that automatic folding and sealing machines are inconvenient for sealing the four sides of cartons, the purpose of this invention is to provide an automatic folding and sealing machine.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: an automatic folding and sealing carton machine, comprising a machine frame, a first machine frame, a conveying unit, a folding unit, and a sealing unit. The conveying unit is installed on the machine frame, the folding unit is installed on one side of the first machine frame, and the sealing unit is installed on the other side of the first machine frame. A second machine frame is provided at both ends of the machine frame. A platform plate is provided in each of the two second machine frames. A moving mechanism is provided between the second machine frames and the platform plates. A flipping mechanism is provided on the two platform plates. A limiting mechanism is also provided on the two platform plates.

[0007] Preferably, the moving mechanism includes two moving shafts, each of the two second equipment frames has a first sliding groove in the middle, each of the two first sliding grooves has a first slider slidably mounted in the middle, and each of the two first sliders has a connecting seat fixedly mounted on its upper surface, with one end of one of the moving shafts rotatably connected to the upper surface of the connecting seat.

[0008] Preferably, each of the two second equipment frames is rotatably mounted with a lead screw, one of the lead screws passes through a first slide groove and is rotatably connected to a first slider by a thread, one end of each of the two lead screws is fixedly mounted with a first synchronous pulley, and a first synchronous belt is installed between the two first synchronous pulleys for transmission.

[0009] Preferably, a first motor is fixedly installed on one side of one of the second equipment racks, a first rotating rod is fixedly installed on the drive output end of the first motor, the end of the first rotating rod away from the first motor is rotatably connected to one side of one of the second equipment racks, and a transmission gear is fixedly installed on the middle part of the first rotating rod and one end of one of the lead screws, and the two transmission gears are meshed together.

[0010] Preferably, the flipping mechanism includes two rotating disks, one of which is rotatably mounted on the middle of a platform plate, and one of the moving shafts is fixedly connected at one end away from the connecting seat to the lower surface of a rotating disk. A second synchronous pulley is fixedly mounted at one end of each of the moving shafts near the rotating disks, and a second synchronous belt is driven between the two second synchronous pulleys.

[0011] Preferably, a second motor is fixedly installed on the lower surface of one of the platform plates, a second rotating rod is fixedly installed on the drive output end of the second motor, and a drive gear is fixedly installed on the end of the second rotating rod away from the second motor and the end of one of the moving shafts near the rotating disk, and the two drive gears are meshed together.

[0012] Preferably, the limiting mechanism includes two U-shaped fixing frames, one of which is fixedly installed on the lower surface of a platform plate, and two frame plates are provided above the two U-shaped fixing frames. The two frame plates pass through the conveying unit, and several evenly distributed limiting rollers are rotatably installed on the opposite sides of the two frame plates.

[0013] Preferably, each of the two U-shaped fixing frames has two second sliding grooves on its upper surface, and a second slider is slidably installed in the middle of each of the four second sliding grooves. An L-shaped connecting plate is fixedly installed on the upper surface of each of the four second sliders, wherein one end of each of the two L-shaped connecting plates is fixedly connected to the side of a frame plate away from the limiting roller.

[0014] Preferably, a double-ended screw is rotatably mounted on each of the two U-shaped fixing brackets, and one of the double-ended screws passes through the two second sliding grooves and is rotatably connected to the two second sliders by threads.

[0015] Preferably, an L-shaped support plate is fixedly installed on the lower surface of each of the two U-shaped fixing frames, a transmission rod is rotatably installed on one end of each of the two L-shaped support plates, a bevel gear is fixedly installed on one end of each of the two transmission rods and the middle of each of the two double-ended screws, wherein two adjacent bevel gears mesh with each other, a third synchronous pulley is fixedly installed on the other end of each of the two transmission rods and the end of each of the two moving shafts near the rotating disk, and a third synchronous belt is installed between the two third synchronous pulleys.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. In this invention, the platform plate and the rotating disk are horizontally displaced and rotated by the moving mechanism and the flipping mechanism. The platform plate and the rotating disk cause the cardboard box after the middle is sealed to be horizontally displaced and flipped to change the edge. This makes the four sides of the cardboard box cover plate correspond to the folding unit and the sealing unit, changing the position of the cardboard box and the flipping edge, thus completing the square-shaped sealing of the cardboard box. This conveniently realizes the square-shaped sealing of the cardboard box and effectively improves the convenience of the square-shaped sealing of the cardboard box.

[0018] 2. In this invention, by driving the two frame plates and the limiting rollers in the limiting mechanism to move closer or further apart, the limiting rollers limit the carton during the flipping and changing process, thereby conveniently realizing the limiting of the carton during the flipping and changing process, improving the stability of the carton, avoiding the carton from running off-center, and thus improving the effect of the carton's square-shaped sealing. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of an automatic folding and sealing box machine according to the present invention.

[0021] Figure 2 This is a front view of an automatic box-sealing machine according to the present invention.

[0022] Figure 3 This is a schematic diagram of the connection structure of the moving mechanism, the flipping mechanism and the limiting mechanism of the present invention.

[0023] Figure 4 This is a cross-sectional structural diagram of the connection, platform plate, and rotating disk of the moving mechanism of the present invention.

[0024] Figure 5 For the present invention Figure 4 Enlarged schematic diagram of part A in the diagram.

[0025] Figure 6 This is a schematic diagram of the connection structure between the limiting mechanism and the moving shaft of the present invention.

[0026] Figure 7 For the present invention Figure 6 Enlarged schematic diagram of part B in the diagram.

[0027] In the diagram: 1. Equipment frame; 11. First equipment frame; 12. Second equipment frame; 13. Platform plate; 2. Conveying unit; 3. Folding unit; 4. Sealing unit; 5. Moving mechanism; 51. Moving shaft; 52. First chute; 53. First slider; 54. Connecting seat; 55. Lead screw; 56. First synchronous pulley; 57. First synchronous belt; 58. First motor; 59. First rotating rod; 591. Transmission gear; 6. Tilting mechanism; 61 61. Rotating disc; 62. Second synchronous pulley; 63. Second synchronous belt; 64. Second motor; 65. Second rotating rod; 66. Drive gear; 7. Limiting mechanism; 71. U-shaped fixing frame; 72. Frame plate; 73. Limiting roller; 74. Second slide groove; 75. Second slider; 76. L-shaped connecting plate; 77. Double-ended screw; 78. L-shaped support plate; 79. Transmission rod; 80. Bevel gear; 81. Third synchronous pulley; 82. Third synchronous belt. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Example: Figure 1-7 As shown, the present invention provides an automatic folding and sealing carton machine, including a machine frame 1, a first machine frame 11, a conveying unit 2, a folding unit 3, and a sealing unit 4. The conveying unit 2 is installed on the machine frame 1, the folding unit 3 is installed on one side of the first machine frame 11, and the sealing unit 4 is installed on the other side of the first machine frame 11. A second machine frame 12 is provided at both ends of the machine frame 1. A platform plate 13 is provided in each of the two second machine frames 12. A moving mechanism 5 is provided between the second machine frames 12 and the platform plate 13. A flipping mechanism 6 is provided on the two platform plates 13. A limiting mechanism 7 is also provided on the two platform plates 13.

[0030] By adopting the above technical solution, a folding and sealing machine consisting of a conveying unit 2, a folding unit 3, and a sealing unit 4 is used. The conveying unit 2 conveys the carton to be sealed, the folding unit 3 folds the carton cover, and the sealing unit 4 seals the middle of the carton cover, thus completing the automatic sealing of the carton. This is existing technology and will not be elaborated here. By providing a moving mechanism 5, a flipping mechanism 6, and a limiting mechanism 7 at both ends of the machine frame 1, the moving mechanism 5 and the flipping mechanism 6 can cause the carton to move horizontally after the middle of the carton cover is sealed, and can also cause the carton to flip and turn in both directions. This allows the edge of the carton cover to correspond with the folding unit 3 and the sealing unit 4, thus completing the U-shaped sealing of the carton. The limiting mechanism 7 can limit the carton during the horizontal displacement and flipping process, thereby improving the stability of the carton, preventing the carton from shifting, and improving the accuracy of the U-shaped sealing of the carton.

[0031] The moving mechanism 5 includes two moving shafts 51. A first slide groove 52 is provided in the middle of each of the two second equipment racks 12. A first slider 53 is slidably installed in the middle of each of the two first slide grooves 52. A connecting seat 54 is fixedly installed on the upper surface of each of the two first sliders 53. One end of one of the moving shafts 51 is rotatably connected to the upper surface of the connecting seat 54.

[0032] By adopting the above technical solution, by driving the first slider 53 to slide horizontally along the inner wall of the first slide groove 52, the first slider 53 can cause the platform plate 13 to move horizontally through the connecting seat 54 and the moving shaft 51. When the carton is located on the upper surface of the platform plate 13, the platform plate 13 can cause the carton to move horizontally synchronously.

[0033] Two second equipment racks 12 are each rotatably mounted with lead screws 55. One of the lead screws 55 passes through a first slide groove 52 and is rotatably connected to a first slider 53 by a thread. One end of each of the two lead screws 55 is fixedly mounted with a first synchronous pulley 56. A first synchronous belt 57 is installed between the two first synchronous pulleys 56 for transmission.

[0034] By adopting the above technical solution, by driving one lead screw 55 to rotate, one lead screw 55 can cause another lead screw 55 to rotate synchronously and in the same direction through two first synchronous pulleys 56 and the first synchronous belt 57, and the lead screw 55 can drive the first slider 53 to slide horizontally along the inner wall of the first slide groove 52.

[0035] A first motor 58 is fixedly installed on one side of one of the second equipment racks 12. A first rotating rod 59 is fixedly installed on the drive output end of the first motor 58. The end of the first rotating rod 59 away from the first motor 58 is rotatably connected to one side of one of the second equipment racks 12. A transmission gear 591 is fixedly installed on the middle of the first rotating rod 59 and one end of one of the lead screws 55. The two transmission gears 591 are meshed together.

[0036] By adopting the above technical solution, by turning on the first motor 58, the drive shaft of the first motor 58 can make the first rotating rod 59 rotate, and the first rotating rod 59 can make a lead screw 55 rotate through two transmission gears 591.

[0037] The flipping mechanism 6 includes two rotating disks 61. One of the rotating disks 61 is rotatably mounted on the middle of a platform plate 13. One of the moving shafts 51 is fixedly connected at one end away from the connecting seat 54 to the lower surface of a rotating disk 61. A second synchronous pulley 62 is fixedly mounted at one end of each of the two moving shafts 51 near the rotating disk 61. A second synchronous belt 63 is installed between the two second synchronous pulleys 62 for transmission.

[0038] By adopting the above technical solution, when the first slider 53 slides horizontally along the inner wall of the first slide groove 52, the first slider 53 can cause the rotating disk 61 and the platform plate 13 to move horizontally through the connecting seat 54 and the moving shaft 51. By driving the moving shaft 51 to rotate, the moving shaft 51 causes the carton to flip and change sides through the rotating disk 61. When one moving shaft 51 rotates, the other moving shaft 51 can rotate synchronously in the same direction through the two second synchronous wheels 62 and the second synchronous belt 63.

[0039] A second motor 64 is fixedly installed on the lower surface of one of the platform plates 13. A second rotating rod 65 is fixedly installed on the drive output end of the second motor 64. A drive gear 66 is fixedly installed on the end of the second rotating rod 65 away from the second motor 64 and the end of one of the moving shafts 51 near the rotating disk 61. The two drive gears 66 are meshed and connected.

[0040] By adopting the above technical solution, by turning on the second motor 64, the drive shaft of the second motor 64 can make the second rotating rod 65 rotate, and the second rotating rod 65 can make the moving shaft 51 rotate through two drive gears 66.

[0041] The limiting mechanism 7 includes two U-shaped fixing frames 71, one of which is fixedly installed on the lower surface of a platform plate 13. Two frame plates 72 are provided above the two U-shaped fixing frames 71. The two frame plates 72 pass through the conveying unit 2. Several evenly distributed limiting rollers 73 are rotatably installed on the opposite sides of the two frame plates 72.

[0042] By adopting the above technical solution and setting the limiting roller 73 of the frame plate 72, when the two frame plates 72 move towards each other or away from each other, the limiting roller 73 can limit the carton in the flipping and changing process.

[0043] Two second slide grooves 74 are opened on the upper surface of each of the two U-shaped fixing frames 71. A second slider 75 is slidably installed in the middle of each of the four second slide grooves 74. An L-shaped connecting plate 76 is fixedly installed on the upper surface of each of the four second sliders 75. One end of each of the two L-shaped connecting plates 76 is fixedly connected to the side of a frame plate 72 away from the limiting roller 73.

[0044] By adopting the above technical solution, by driving the second slider 75 to slide horizontally along the inner wall of the second slide groove 74, the second slider 75 can make the frame plate 72 and the limiting roller 73 move horizontally synchronously through the L-shaped connecting plate 76.

[0045] Two U-shaped fixing brackets 71 are each rotatably mounted with a double-headed screw 77, one of which passes through two second sliding grooves 74 and is rotatably connected to two second sliders 75 by threads.

[0046] By adopting the above technical solution, by driving the double-ended screw 77 to rotate, the double-ended screw 77 can drive the second slider 75 to slide horizontally along the inner wall of the second slide groove 74.

[0047] L-shaped support plates 78 are fixedly installed on the lower surfaces of the two U-shaped fixed frames 71. A transmission rod 79 is rotatably installed on one end of each of the two L-shaped support plates 78. A bevel gear 8 is fixedly installed on one end of each of the two transmission rods 79 and the middle of each of the two double-ended screws 77. Adjacent bevel gears 8 mesh with each other. A third synchronous pulley 81 is fixedly installed on the other end of each of the two transmission rods 79 and the end of each of the two moving shafts 51 near the rotating disk 61. A third synchronous belt 82 is installed between the two third synchronous pulleys 81.

[0048] By adopting the above technical solution, when the moving shaft 51 rotates, the moving shaft 51 can make the transmission rod 79 rotate through the two third synchronous pulleys 81 and the third synchronous belt 82, and the transmission rod 79 can make the double-headed screw 77 rotate through the two bevel gears 8.

[0049] Working principle: When the carton moves horizontally along the conveying unit 2, after the folding unit 3 and the sealing unit 4 complete the sealing of the middle of the carton cover, the conveying unit 2 continues to convey the carton, and the carton is conveyed to a rotating disk 61 near the sealing unit 4.

[0050] At this time, the operator first turns on the first motor 58. The drive shaft of the first motor 58 causes the first rotating rod 59 to rotate. The first rotating rod 59 causes the corresponding lead screw 55 to rotate through two transmission gears 591. At this time, one lead screw 55 causes the other lead screw 55 to rotate synchronously in the same direction through two first synchronous pulleys 56 and a first synchronous belt 57. The two lead screws 55 drive the two first sliders 53 to slide horizontally along the inner wall of the corresponding first slide groove 52. The two first sliders 53 cause the two rotating disks 61 and two platform plates 13 to move horizontally through two connecting seats 54 and two moving shafts 51. At this time, one of the rotating disks 61 causes the carton to move horizontally synchronously, so that the edge of the carton cover plate corresponds to the folding unit 3 and the sealing unit 4.

[0051] Then, the two sides of the carton cover are sealed with glue through the conveying unit 2, folding unit 3 and sealing unit 4. After the two sides of the carton cover are sealed with glue, the carton is conveyed by the conveying unit 2 to a rotating disk 61 on the side away from the sealing unit 4.

[0052] At this time, the operator turns on the second motor 64. The drive shaft of the second motor 64 causes the second rotating rod 65 to rotate. The second rotating rod 65 causes the corresponding moving shaft 51 to rotate through two drive gears 66. The moving shaft 51 causes the other moving shaft 51 to rotate synchronously in the same direction through two second synchronous pulleys 62 and a second synchronous belt 63. The two moving shafts 51 cause the two rotating disks 61 to rotate. At this time, one rotating disk 61 causes the carton to flip and change sides. After the carton is flipped 90 degrees, the second motor 64 is turned off. Then, according to the steps described above, the horizontal position of the carton after the flipped sides is finely adjusted so that the edge of the carton cover corresponds to the folding unit 3 and the sealing unit 4. Then, the edge of the carton is sealed with glue. This completes the sealing of the four sides of the carton, thus conveniently realizing the U-shaped sealing of the carton and effectively improving the convenience of the U-shaped sealing of the carton.

[0053] During the carton flipping and edge conversion process, two moving shafts 51 rotate two transmission rods 79 via two corresponding third synchronous wheels 81 and a third synchronous belt 82. The two transmission rods 79 rotate two double-headed screws 77 via four bevel gears 8. The two double-headed screws 77 drive two corresponding second sliders 75 to slide horizontally along the inner wall of the corresponding second slide groove 74. Adjacent second sliders 75 slide towards each other or away from each other. The four second sliders 75 are connected by four L-shaped connecting plates 76, which bring the two frame plates 72 and multiple limiting rollers 73 closer together or further apart (the specific state of moving towards each other or away from each other depends on the direction of the carton flipping and edge conversion). The multiple limiting rollers 73 on the opposite sides of the two frame plates 72 are always in contact with the two sides of the carton during the flipping and edge conversion process, limiting the carton. This conveniently realizes the limiting of the carton during the flipping and edge conversion process, improves the stability of the carton, avoids the carton from deviating, and thus improves the effect of the carton's swivel seal.

[0054] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. An automatic carton folding and sealing machine, comprising a machine frame (1), a first machine frame (11), a conveying unit (2), a folding unit (3), and a sealing unit (4), wherein the conveying unit (2) is mounted on the machine frame (1), the folding unit (3) is mounted on one side of the first machine frame (11), and the sealing unit (4) is mounted on the other side of the first machine frame (11), characterized in that: The equipment frame (1) is provided with a second equipment frame (12) at both ends, and a platform plate (13) is provided in each of the two second equipment frames (12). A moving mechanism (5) is provided between the second equipment frame (12) and the platform plate (13). A flipping mechanism (6) is provided on the two platform plates (13). A limiting mechanism (7) is also provided on the two platform plates (13). The moving mechanism (5) includes two moving shafts (51), and a first slide groove (52) is provided in the middle of each of the two second equipment frames (12). A first slider (53) is slidably installed in the middle of each of the two first slide grooves (52). A connecting seat (54) is fixedly installed on the upper surface of each of the two first sliders (53). One end of one of the moving shafts (51) is rotatably connected to the upper surface of the connecting seat (54). The flipping mechanism (6) includes two rotating disks (61), one of which is rotatably mounted on the middle of a platform plate (13), and one of which is fixedly connected to the lower surface of a rotating disk (61) at one end away from the connecting seat (54). A second synchronous pulley (62) is fixedly mounted on one end of each of the two moving shafts (51) near the rotating disk (61), and a second synchronous belt (63) is installed between the two second synchronous pulleys (62). A second motor (64) is fixedly installed on the lower surface of one of the platform plates (13). A second rotating rod (65) is fixedly installed on the drive output end of the second motor (64). A drive gear (66) is fixedly installed on the end of the second rotating rod (65) away from the second motor (64) and the end of one of the moving shafts (51) near the rotating disk (61). The two drive gears (66) are meshed together.

2. The automatic cap-folding and sealing machine as described in claim 1, characterized in that, Both of the second equipment racks (12) are rotatably mounted with lead screws (55), one of the lead screws (55) passes through a first slide groove (52) and is rotatably connected to a first slider (53) by a thread. One end of both lead screws (55) is fixedly mounted with a first synchronous pulley (56), and a first synchronous belt (57) is installed between the two first synchronous pulleys (56).

3. An automatic box-sealing and folding machine as described in claim 2, characterized in that, A first motor (58) is fixedly installed on one side of one of the second equipment racks (12). A first rotating rod (59) is fixedly installed on the drive output end of the first motor (58). The end of the first rotating rod (59) away from the first motor (58) is rotatably connected to one side of one of the second equipment racks (12). A transmission gear (591) is fixedly installed on the middle part of the first rotating rod (59) and one end of one of the lead screws (55). The two transmission gears (591) are meshed together.

4. An automatic box-sealing and capping machine as described in claim 1, characterized in that, The limiting mechanism (7) includes two U-shaped fixing frames (71), one of which is fixedly installed on the lower surface of a platform plate (13). Two frame plates (72) are provided above the two U-shaped fixing frames (71). The two frame plates (72) pass through the conveying unit (2). Several evenly distributed limiting rollers (73) are rotatably installed on the opposite sides of the two frame plates (72).

5. An automatic box-sealing and folding machine as described in claim 4, characterized in that, Two second slide grooves (74) are opened on the upper surface of the two U-shaped fixing frames (71). A second slider (75) is slidably installed in the middle of the four second slide grooves (74). An L-shaped connecting plate (76) is fixedly installed on the upper surface of the four second sliders (75). One end of the two L-shaped connecting plates (76) is fixedly connected to the side of a frame plate (72) away from the limiting roller (73).

6. An automatic box-sealing and folding machine as described in claim 5, characterized in that, Both of the U-shaped fixing brackets (71) are rotatably mounted with double-headed screws (77), one of which passes through the two second sliding grooves (74) and is rotatably connected to the two second sliders (75) by threads.

7. An automatic box-sealing and folding machine as described in claim 6, characterized in that, L-shaped support plates (78) are fixedly installed on the lower surfaces of the two U-shaped fixed brackets (71). A transmission rod (79) is rotatably installed on one end of each of the two L-shaped support plates (78). A bevel gear (8) is fixedly installed on one end of each of the two transmission rods (79) and the middle of each of the two double-headed screws (77). Adjacent bevel gears (8) mesh with each other. A third synchronous pulley (81) is fixedly installed on the other end of each of the two transmission rods (79) and the end of each of the two moving shafts (51) near the rotating disk (61). A third synchronous belt (82) is installed between the two third synchronous pulleys (81).

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