A cleaning device for processing aluminum veneer

Abstract

The application provides a cleaning device for aluminum veneer processing, which comprises a rack, a plurality of groups of conveying rollers driven to rotate are arranged on the rack, a brushing mechanism is further arranged on the rack, a plurality of groups of spray heads are arranged on one side of the brushing mechanism at intervals, a supporting frame is arranged on the other side of the brushing mechanism on the rack, a lifting frame is arranged on the supporting frame in a lifting mode, a sponge roller is rotatably arranged on the lifting frame, a driving mechanism is arranged on the rack, the sponge roller is driven to descend and rotate in contact with the aluminum veneer when the aluminum veneer is supported on the conveying roller, an extrusion mechanism is arranged on the rack, and the sponge roller is extruded by the extrusion mechanism when the sponge roller does not descend. The device can automatically clean water stains on the aluminum veneer during the cleaning process, can perform dehydration treatment on the sponge roller to ensure the water absorption effect, and does not need manual subsequent cleaning, thereby effectively reducing the labor intensity of workers.

Description

Technical Field

[0001] This invention specifically relates to a cleaning device for aluminum single-panel processing. Background Technology

[0002] During the processing of aluminum panels, impurities such as rolling oil, dust, and oxide scale will adhere to the surface. If they are not cleaned in time, they will affect the processing quality of subsequent processes such as spraying and bending. Therefore, special cleaning equipment is needed to clean aluminum panels.

[0003] Existing aluminum panel cleaning devices mainly adopt spray cleaning or cleaning tank cleaning methods. For example, Chinese invention patent with publication number CN111545519A provides a high-efficiency cleaning device for aluminum panels, which can push stacked aluminum panels to create displacement differences between the panels, thereby allowing the liquid to better contact the surface of the aluminum panels and making the cleaning of aluminum panels more convenient.

[0004] However, current methods for cleaning aluminum panels mostly involve removing surface water stains through heating wires and hot air circulation. These drying methods consume significant amounts of electricity to maintain the high-temperature environment, resulting in high energy costs. Furthermore, the heating and evaporation processes are time-consuming, leading to low cleaning efficiency and making them unsuitable for large-scale production. Even after drying, some water stains may remain on the surface of the aluminum panels, requiring secondary manual wiping and increasing labor intensity. Therefore, this paper proposes a cleaning device for aluminum panel processing to address these issues. Summary of the Invention

[0005] Therefore, it is necessary to provide a cleaning device for aluminum panel processing to address the problem that existing aluminum panel cleaning devices are inefficient and energy-consuming in removing water stains by drying after cleaning, and are not convenient for automatically and quickly cleaning water stains on aluminum panels after cleaning, which leads to the need for subsequent manual cleaning and increases the labor intensity of workers.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a cleaning device for aluminum single-panel processing, comprising: The frame is equipped with multiple sets of electrically driven rotating conveyor rollers, and the frame is also equipped with a brushing mechanism. Multiple sets of spray heads are arranged at intervals, all located on one side of the washing mechanism, and their spraying direction is towards the conveying roller; A support frame is fixedly mounted on the machine frame and located on the other side of the brushing mechanism, and a lifting frame is provided that can be raised and lowered, on which a sponge roller is rotatably mounted; A drive mechanism, mounted on the frame, drives the sponge roller to descend, contact the aluminum panel, and rotate when the aluminum panel is supported on the conveyor roller; and An extrusion mechanism, mounted on the frame, is used to extrude the sponge roller when the sponge roller is not descending.

[0007] In one embodiment, the drive mechanism includes: Two sets of drive frames are provided and are vertically adjustable on the frame and located on both sides of the support frame. The two sets of drive frames are fixedly connected, and guide ramps are provided on both sides of the drive frames. A reset assembly is mounted on the drive frame and connected to the frame. A linkage component, mounted on the drive frame and connected to the lifting frame, converts the lifting of the drive frame into the lifting of the lifting frame; and A power unit, mounted on the frame, is connected to the conveyor roller and the sponge roller after the lifting frame descends, and converts the rotation of the conveyor roller into driving the rotation of the sponge roller.

[0008] In one embodiment, the top ends of both sets of drive frames are rotatably equipped with support rollers.

[0009] In one embodiment, the reset component includes: A guide rod is mounted on the drive frame, and a guide frame is provided on the frame. The guide rod is vertically and flexibly inserted through the guide frame. A drive plate is mounted on the guide rod, and an elastic element is provided between it and the guide frame.

[0010] In one embodiment, the extrusion mechanism includes: Two sets of extrusion claws are arranged opposite each other. A crossbar is provided on the extrusion claw, and the crossbar is slidably passed through the support frame. A linkage frame, mounted on the lifting frame, is provided with a first inclined groove, the end of which is connected to a flat groove; and The drive rod is fixedly mounted on the crossbar and slidably engaged in the first inclined groove.

[0011] In one embodiment, the opening width of the extrusion claw is greater than the diameter of the sponge roller, and the gaps of the two sets of extrusion claws are staggered.

[0012] In one embodiment, the linkage component includes: The second inclined groove is formed on the drive plate, and the drive rod is slidably engaged in the second inclined groove.

[0013] In one embodiment, the power assembly includes: The first gear is fixedly disposed at the end of one of the sets of conveying rollers; The second gear is rotatably mounted on the frame and meshes with the first gear; A first ratchet disc is rotatably mounted on the lifting frame and connected to the sponge roller via a first bevel gear pair; and The second ratchet disc is rotatably mounted on the frame, and a second bevel gear pair is provided at its bottom. The second bevel gear pair is connected to the second gear through a first synchronous belt mechanism. After the first ratchet disc descends, it can mesh with the second ratchet disc.

[0014] In one embodiment, the scrubbing mechanism includes: The mounting rod is rotatably mounted on the frame and is connected to the second bevel gear pair via a second synchronous belt mechanism; A roller brush, slidably fitted onto the mounting rod, and its length being greater than the width of the frame; and A transmission assembly is disposed on the second ratchet disc and connected to the roller brush to convert the rotation of the second ratchet disc into driving the roller brush to reciprocate.

[0015] In one embodiment, the transmission assembly includes: A drive shaft is mounted on the second ratchet disc and extends through the first ratchet disc; A sliding frame, which can slide laterally on the frame, is connected to a mounting ring, and the end of the roller brush is rotatably disposed within the sliding frame; and The drive disk is rotatably mounted on the frame, and a drive column is eccentrically mounted on its bottom. The drive column is slidably engaged in the slide frame, and the drive disk is connected to the drive shaft through a third synchronous belt mechanism.

[0016] Compared with the prior art, the present invention has at least the following advantages: This device uses conveyor rollers to continuously transport aluminum panels. After the spray heads and brushing mechanism complete the initial cleaning, the drive mechanism automatically lowers the lifting frame when the aluminum panel reaches the designated position, ensuring close contact between the sponge roller and the panel surface. The conveyor rollers' power linkage enables the sponge roller to rotate synchronously, utilizing the sponge's high absorbency to quickly absorb water stains. Compared to traditional drying methods, this method requires no additional energy and significantly improves water stain removal efficiency. Furthermore, a squeezing mechanism automatically dehydrates the sponge roller when it is not in operation, ensuring the sponge maintains good absorbency and preventing water stain residue due to sponge saturation. This device automatically cleans water stains from the aluminum panel during the cleaning process, eliminating the need for subsequent manual cleaning and effectively reducing the labor intensity of workers. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention, the accompanying drawings used in the specific embodiments will be briefly described below. In all the drawings, the elements or parts are not necessarily drawn to scale.

[0018] Figure 1 This is a three-dimensional structural diagram of a cleaning device for aluminum single-panel processing provided by the present invention; Figure 2 This is a schematic diagram of the frame structure in a cleaning device for aluminum single-panel processing according to the present invention; Figure 3 This is a schematic diagram of the structure of the parts above the frame in a cleaning device for aluminum single-panel processing according to the present invention; Figure 4 This is a schematic diagram of the drive frame in a cleaning device for aluminum single-panel processing according to the present invention; Figure 5 This is a schematic diagram of the installation structure of the sponge roller in a cleaning device for aluminum single-panel processing according to the present invention. Figure 6 This is a schematic diagram of the power component in a cleaning device for aluminum single-panel processing according to the present invention; Figure 7 This is a schematic diagram of the structure of the roller brush in a cleaning device for aluminum single-panel processing according to the present invention.

[0019] Figure label: 1. Frame; 2. Conveyor roller; 3. First gear; 4. Spray head; 5. Support frame; 6. Guide frame; 7. Lifting frame; 8. Sponge roller; 9. First bevel gear pair; 10. First ratchet disc; 11. Linkage frame; 12. First inclined groove; 13. Flat groove; 14. Crossbar; 15. Extrusion claw; 16. Drive rod; 17. Drive frame; 18. Support roller; 19. Guide rod; 20. Drive plate; 21. Second inclined groove; 22. Elastic element; 23. Second gear; 24. First synchronous belt mechanism; 25. Second bevel gear pair; 26. Second ratchet disc; 27. Drive shaft; 28. Mounting rod; 29. ​​Second synchronous belt mechanism; 30. Roller brush; 31. Sliding frame; 32. Mounting ring; 33. Drive disc; 34. Drive column; 35. Third synchronous belt mechanism. Detailed Implementation

[0020] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the invention; therefore, the invention is not limited to the specific embodiments disclosed below.

[0021] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0023] Example: Please see Figure 1 , 2 5. The present invention provides a cleaning device for aluminum single-panel processing, including a frame 1, a plurality of electrically driven rotating conveyor rollers 2 on the frame 1, a brushing mechanism on the frame 1, a plurality of spray heads 4 arranged at intervals on one side of the brushing mechanism on the frame 1, the spraying direction of the spray heads 4 facing the conveyor rollers 2, a support frame 5 fixedly installed on the other side of the brushing mechanism on the frame 1, a lifting frame 7 that can be raised and lowered on the support frame 5, and a sponge roller 8 that can be rotatably installed on the lifting frame 7.

[0024] When in use, the device can convey aluminum panels through the conveyor roller 2. During the conveying process, the cleaning liquid can be sprayed from the spray head 4 to rinse the surface of the aluminum panels. The surface of the aluminum panels can also be brushed by the brushing mechanism to remove stubborn stains. After brushing, when the aluminum panels pass under the support frame 5 and the lifting frame 7 is in a low position, the surface of the aluminum panels can be wiped with water by the sponge roller 8. At the same time, the sponge roller 8 can be rotated to improve the water absorption effect and avoid excessive local water absorption, which would reduce the water absorption effect.

[0025] Please see Figures 2 to 4 In this embodiment, a drive mechanism is provided on the frame 1. When the aluminum single panel is supported on the conveying roller 2, the drive mechanism drives the sponge roller 8 to descend, contact the aluminum single panel, and rotate. The drive mechanism includes two sets of liftable drive frames 17 on the frame 1. The two sets of drive frames 17 are located on both sides of the support frame 5 and are fixedly connected. Both sides of the drive frames 17 are provided with guide slopes. The top of both sets of drive frames 17 are rotatably provided with support rollers 18. A reset assembly connected to the frame 1 is provided on the drive frame 17. The reset assembly includes a guide rod 19 on the drive frame 17. A guide frame 6 is provided on the frame 1. The guide rod 19 is liftably inserted through the guide frame 6. A drive plate 20 is provided on the guide rod 19. An elastic element 22 is provided between the drive plate 20 and the guide frame 6.

[0026] When aluminum panels are conveyed by multiple sets of conveying rollers 2, the aluminum panels can push the inclined surface of the drive frame 17 to lower the drive frame 17 and make contact with the support rollers 18. The arrangement of the support rollers 18 can reduce the friction between the drive frame 17 and the aluminum panels, thus protecting the aluminum panels. Furthermore, the arrangement of two sets of drive frames 17 ensures that the drive frame 17 can be controlled to descend when there are aluminum panels at the bottom of the support frame 5. The drive frame 17 is controlled to descend before the aluminum panels enter the bottom of the support frame 5. Only after the aluminum panels have completely moved out of the bottom of the support frame 5 can the drive frame 17 be controlled to rise under the action of the elastic element 22, so as to ensure that the aluminum panels can be thoroughly wiped afterwards.

[0027] Please see Figures 3 to 5 In this embodiment, the frame 1 is equipped with a pressing mechanism, which presses the sponge roller 8 when it is not descending. The pressing mechanism includes two sets of opposing pressing claws 15, each with a crossbar 14 that slidably passes through the support frame 5. The lifting frame 7 is equipped with a linkage frame 11, which has a first inclined groove 12. The end of the first inclined groove 12 is connected to a flat groove 13. A drive rod 16 is fixedly mounted on the crossbar 14 and slidably engaged within the first inclined groove 12. The driving mechanism also includes a linkage component mounted on the drive frame 17 and connected to the lifting frame 7. The linkage component converts the lifting of the drive frame 17 into the lifting of the lifting frame 7. The linkage component includes a second inclined groove 21 on the drive plate 20, and the drive rod 16 slidably engaged within the second inclined groove 21.

[0028] When the drive frame 17 rises, the two sets of squeezing claws 15 can be controlled to close by the cooperation of the second inclined groove 21 on the drive plate 20 and the drive rod 16. At the same time as controlling the squeezing claws 15 to close, the lifting frame 7 can also be controlled to rise by the cooperation of the drive rod 16 and the first inclined groove 12 until the drive rod 16 slides into the flat groove 13 and fixes the position of the lifting frame 7. The continuous closing of the squeezing claws 15 can squeeze and dehydrate the sponge roller 8 on the lifting frame 7. The opening width of the squeezing claws 15 is larger than the diameter of the sponge roller 8 to fully squeeze the sponge roller 8. The gaps of the two sets of squeezing claws 15 are staggered so that the two sets of squeezing claws 15 can fit in a cross state when they close, which can fully squeeze the sponge roller 8, thereby avoiding the sponge roller 8 from absorbing too much water and affecting its subsequent water absorption effect.

[0029] Please see Figure 3 , 56. In this embodiment, the drive mechanism further includes a power component mounted on the frame 1. After the lifting frame 7 descends, the power component connects to the conveying roller 2 and the sponge roller 8, converting the rotation of the conveying roller 2 into driving the rotation of the sponge roller 8. The power component includes a first gear 3 fixedly mounted at the end of one set of conveying rollers 2. A second gear 23 is rotatably mounted on the frame 1, meshing with the first gear 3. A first ratchet disc 10 is rotatably mounted on the lifting frame 7, connected to the sponge roller 8 via a first bevel gear pair 9. A second ratchet disc 26 is rotatably mounted on the frame 1, with a second bevel gear pair 25 at the bottom of the second ratchet disc 26. The second bevel gear pair 25 is connected to the second gear 23 via a first synchronous belt mechanism 24. After the first ratchet disc 10 descends, it can mesh with the second ratchet disc 26.

[0030] When there is no aluminum panel on the conveyor roller 2, the lifting frame 7 is in a high position, and the first ratchet disc 10 and the second ratchet disc 26 are not engaged, thus not controlling the rotation of the sponge roller 8, avoiding damage to the sponge roller 8 when it rotates during compression. When there is an aluminum panel on the conveyor roller 2, the lifting frame 7 is lowered by the drive frame 17, causing the first ratchet disc 10 to descend and engage with the second ratchet disc 26. When the conveyor roller 2 rotates, the rotation direction can be reversed by the cooperation of the first gear 3 and the second gear 23 and transmitted to the second bevel gear pair 25. The second bevel gear pair 25 drives the second ratchet disc 26 to rotate, and then transmits the rotation power to the first ratchet disc 10. The first bevel gear pair 9 drives the sponge roller 8 to rotate, and the rotation direction of the sponge roller 8 is the same as that of the conveyor roller 2, so as to increase the relative speed between the sponge roller 8 and the aluminum panel, thereby improving the water absorption effect.

[0031] Please see Figure 1 , 3 7. In this embodiment, the brushing mechanism includes a mounting rod 28 rotatably mounted on the frame 1. The mounting rod 28 is connected to the second bevel gear pair 25 via a second synchronous belt mechanism 29. A roller brush 30 is slidably mounted on the mounting rod 28. The length of the roller brush 30 is greater than the width of the frame 1. A transmission assembly connected to the roller brush 30 is provided on the second ratchet disc 26. The rotation of the second ratchet disc 26 is converted into driving the roller brush 30 to reciprocate. The transmission assembly includes a drive shaft 27 mounted on the second ratchet disc 26 and passing through the first ratchet disc 10. A slide frame 31 is slidably mounted on the frame 1. A mounting ring 32 is connected to the slide frame 31. The end of the roller brush 30 is rotatably mounted in the slide frame 31. A drive disc 33 is rotatably mounted on the frame 1. A drive column 34 is eccentrically mounted at the bottom of the drive disc 33. The drive column 34 is slidably engaged in the slide frame 31. The drive disc 33 and the drive shaft 27 are connected via a third synchronous belt mechanism 35.

[0032] The second ratchet disc 26 remains rotating, driving the drive shaft 27 to rotate. Through the cooperation of the second bevel gear pair 25 and the second synchronous belt mechanism 29, the mounting rod 28 is driven to rotate, thereby driving the roller brush 30 to rotate. During the rotation of the drive shaft 27, the drive disc 33 is controlled to rotate through the third synchronous belt mechanism 35. Through the cooperation of the drive column 34 at the bottom of the drive disc 33 and the slide frame 31, the roller brush 30 is driven to slide back and forth on the drive shaft 27. Thus, the roller brush 30 can both rotate to brush the aluminum panel longitudinally and slide to brush the aluminum panel laterally, effectively cleaning the stains attached to the surface of the aluminum panel.

[0033] Specific usage and beneficial effects of the present invention: This device uses conveyor rollers 2 to continuously transport aluminum panels. After the spray heads 4 and the brushing mechanism complete the initial cleaning, the drive mechanism automatically lowers the lifting frame 7 when the aluminum panel reaches the designated position, ensuring close contact between the sponge rollers 8 and the surface of the aluminum panel. The sponge rollers 8 rotate synchronously via the power linkage of the conveyor rollers 2, utilizing the high absorbency of the sponge to quickly absorb water stains. Compared to traditional drying methods, this method requires no additional energy consumption and significantly improves water stain removal efficiency. Furthermore, the extrusion mechanism automatically squeezes and dehydrates the sponge rollers 8 when they are not in operation, ensuring the sponge maintains good absorbency and preventing water stain residue due to sponge saturation. This device automatically cleans water stains from the aluminum panels during the cleaning process, eliminating the need for subsequent manual cleaning and effectively reducing the labor intensity of workers.

[0034] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A cleaning device for aluminum single-panel processing, characterized in that, Including: A frame (1) is provided with multiple sets of electrically driven rotating conveyor rollers (2), and a brushing mechanism is also provided on the frame (1). Multiple sets of spray heads (4) are arranged at intervals, and all are located on one side of the brushing mechanism, with their spraying direction facing the conveying roller (2). The support frame (5) is fixedly installed on the frame (1) and located on the other side of the brushing mechanism, and is equipped with a lifting frame (7) that can be raised and lowered. A sponge roller (8) is rotatably installed on the lifting frame (7). A drive mechanism is provided on the frame (1) to drive the sponge roller (8) to descend and contact the aluminum single plate when the aluminum single plate is supported on the conveying roller (2); and An extrusion mechanism is provided on the frame (1) to extrude the sponge roller (8) when the sponge roller (8) is not descending.

2. The cleaning device for aluminum single-panel processing according to claim 1, characterized in that, The driving mechanism includes: Two sets of drive frames (17) are provided and are mounted on the frame (1) in a height-adjustable manner, and are located on both sides of the support frame (5). The two sets of drive frames (17) are fixedly connected, and guide ramps are provided on both sides of the drive frames (17). A reset assembly is mounted on the drive frame (17) and connected to the frame (1); A linkage component is provided on the drive frame (17) and connected to the lifting frame (7) to convert the lifting of the drive frame (17) into the lifting of the lifting frame (7); and A power unit is provided on the frame (1) to connect with the conveyor roller (2) and the sponge roller (8) after the lifting frame (7) descends, and to convert the rotation of the conveyor roller (2) into driving the sponge roller (8) to rotate.

3. The cleaning device for aluminum single-panel processing according to claim 2, characterized in that: Both sets of drive frames (17) are rotatably equipped with support rollers (18) at their top ends.

4. The cleaning device for aluminum single-panel processing according to claim 2, characterized in that, The reset component includes: A guide rod (19) is mounted on the drive frame (17), and a guide frame (6) is mounted on the frame (1). The guide rod (19) is vertically and flexibly mounted on the guide frame (6). A drive plate (20) is disposed on the guide rod (19) and an elastic element (22) is disposed between it and the guide frame (6).

5. A cleaning device for aluminum single-panel processing according to claim 4, characterized in that, The extrusion mechanism includes: Two sets of extrusion claws (15) are arranged opposite each other. A crossbar (14) is provided on the extrusion claw (15). The crossbar (14) is slidably passed through the support frame (5). A linkage frame (11) is mounted on the lifting frame (7) and has a first inclined groove (12), the end of which is connected to a flat groove (13); and The drive rod (16) is fixedly mounted on the crossbar (14) and slidably engaged in the first inclined groove (12).

6. The cleaning device for aluminum single-panel processing according to claim 5, characterized in that: The opening width of the extrusion claw (15) is greater than the diameter of the sponge roller (8), and the gaps of the two sets of extrusion claws (15) are staggered.

7. A cleaning device for aluminum single-panel processing according to claim 5, characterized in that, The linkage components include: The second inclined groove (21) is formed on the drive plate (20), and the drive rod (16) is slidably engaged in the second inclined groove (21).

8. A cleaning device for aluminum single-panel processing according to claim 2, characterized in that, The power assembly includes: The first gear (3) is fixedly disposed at the end of one of the sets of conveying rollers (2); The second gear (23) is rotatably mounted on the frame (1) and meshes with the first gear (3); A first ratchet disc (10) is rotatably mounted on the lifting frame (7) and connected to the sponge roller (8) via a first bevel gear pair (9); and The second ratchet disc (26) is rotatably mounted on the frame (1), and a second bevel gear pair (25) is provided at its bottom. The second bevel gear pair (25) is connected to the second gear (23) through the first synchronous belt mechanism (24). After the first ratchet disc (10) descends, it can mesh with the second ratchet disc (26).

9. A cleaning device for aluminum single-panel processing according to claim 8, characterized in that, The scrubbing mechanism includes: Mounting rod (28) is rotatably mounted on the frame (1) and connected to the second bevel gear pair (25) via the second synchronous belt mechanism (29); A roller brush (30) is slidably fitted onto the mounting rod (28), and its length is greater than the width of the frame (1); and A transmission assembly is disposed on the second ratchet disc (26) and connected to the roller brush (30) to convert the rotation of the second ratchet disc (26) into driving the roller brush (30) to reciprocate.

10. A cleaning device for aluminum single-panel processing according to claim 9, characterized in that, The transmission assembly includes: The drive shaft (27) is disposed on the second ratchet disc (26) and passes through the first ratchet disc (10); A sliding frame (31) is slidably mounted on the frame (1) and connected to a mounting ring (32). The end of the roller brush (30) is rotatably mounted within the sliding frame (31). The drive disk (33) is rotatably mounted on the frame (1), and a drive column (34) is eccentrically mounted on its bottom. The drive column (34) is slidably mounted in the slide frame (31). The drive disk (33) is connected to the drive shaft (27) through a third synchronous belt mechanism (35).

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