Intelligent coating head

Abstract

This application relates to an intelligent coating head, belonging to the technical field of coating equipment. It includes a frame and an anilox roller rotatably mounted on the frame, and further includes: a material trough located below the anilox roller and slidably mounted on the frame in a vertical direction; a doctor blade mechanism located on one side of the anilox roller and movably connected to the frame; a cleaning mechanism located on the side of the anilox roller away from the doctor blade mechanism and movably connected to the frame; a first drive member located on the frame for driving the cleaning mechanism closer to or away from the anilox roller; a second drive member located on the frame and connected to the material trough; a third drive member located on the frame for driving the doctor blade mechanism closer to or away from the anilox roller; and a controller connected to the first, second, and third drive members respectively. This application improves the automation level and work efficiency of equipment operation, and reduces labor costs and operational complexity.

Description

Technical Field

[0001] This application relates to the field of coating equipment, and more particularly to an intelligent coating head. Background Technology

[0002] The coating head is the core component of coating equipment, its function being to uniformly and continuously transfer a specific coating onto the substrate surface. Common coating heads typically consist of a frame and an anilox roller rotatably connected to the frame. A trough for holding the coating is located below the anilox roller, and a scraper mechanism on one side removes excess coating from the roller's surface. Under the drive of the coating head, the substrate typically passes sequentially around a front corner roller located behind the anilox roller and a rear corner roller located in front of it, thus contacting the anilox roller surface to complete the coating transfer.

[0003] However, existing coating heads of this type have significant shortcomings in terms of automation and efficiency. Their feed troughs, doctor blade mechanisms, and front and rear corner rollers are mostly fixed manually or mechanically, with position adjustments relying on manual experience, making it difficult to guarantee accuracy and consistency. Particularly problematic is the extremely cumbersome process of periodically cleaning the anilox rollers: the feed trough, doctor blade mechanism, and other components must be manually pulled apart to a sufficient physical safety distance for cleaning; after cleaning, these components must be manually moved back to their working positions. During this retraction process, it is often impossible to accurately reset them to their initial process positions before cleaning, requiring time-consuming fine-tuning by the operator to ensure coating quality recovery. The entire cleaning and adjustment process has a low degree of automation, heavily relies on manual operation, resulting in long equipment downtime and requiring improvement in overall work efficiency. Summary of the Invention

[0004] To improve the automation level and overall efficiency of coating operations, this application provides an intelligent coating head.

[0005] This application provides an intelligent coating head, which adopts the following technical solution: An intelligent coating head includes a frame and an anilox roller rotatably mounted on the frame. It further includes: a material trough located below the anilox roller and slidably mounted on the frame in a vertical direction; a doctor blade mechanism located on one side of the anilox roller and movably connected to the frame; a cleaning mechanism located on the side of the anilox roller away from the doctor blade mechanism and movably connected to the frame; a first driving member located on the frame for driving the cleaning mechanism closer to or away from the anilox roller; a second driving member located on the frame and connected to the material trough; a third driving member located on the frame for driving the doctor blade mechanism closer to or away from the anilox roller; and a controller connected to the first, second, and third driving members respectively.

[0006] Optionally, it also includes: a first sensor for detecting the position of the cleaning mechanism; a second sensor for detecting the position of the material trough; and a third sensor for detecting the position of the scraper mechanism; the first, second, and third sensors are all connected to the controller signal.

[0007] Optionally, it also includes a front roller frame and a rear roller frame mounted on the frame. The front roller frame and the rear roller frame are located on opposite sides above the anilox roller. Wrapping rollers are rotatably connected to the front roller frame and the rear roller frame respectively. The frame is provided with a first lifting member for driving the front roller frame to rise and fall and a second lifting member for driving the rear roller frame to rise and fall. The first lifting member and the second lifting member are respectively connected to the controller signal.

[0008] Optionally, the frame is equipped with a fourth sensor for detecting the position of the front roller frame and a fifth sensor for detecting the position of the rear roller frame, both of which are connected to the controller signal.

[0009] Optionally, the controller is configured to: when cleaning is required, control the second drive member, the third drive member, the first lifting member, and the second lifting member to move the material trough, the scraper mechanism, the front roller frame, and the rear roller frame to their respective avoidance positions away from the anilox roller, and control the first drive member to drive the cleaning mechanism to the working position; after cleaning is completed, control the first drive member to drive the cleaning mechanism to reset, and control the second drive member, the third drive member, the first lifting member, and the second lifting member to move the material trough, the scraper mechanism, the front roller frame, and the rear roller frame back to their respective preset working positions.

[0010] Optionally, the cleaning mechanism includes a cleaning frame and a cleaning box disposed on the cleaning frame. The cleaning box is openable and closable. The cleaning frame is slidably connected to the frame along the width direction of the frame. The cleaning frame is connected to the output end of the first driving component.

[0011] Optionally, the cleaning box includes an upper box and a lower box that are interlocked. Both ends of the upper box and the lower box are provided with through holes through which the roller shaft of the anilox roller can pass. The lower box is provided with an inlet for connecting an external cleaning hose. The upper box and the lower box are connected by a hinge on the side near the first driving member. The cleaning rack is provided with an opening and closing drive assembly for driving the upper box and the lower box to open and close.

[0012] Optionally, the opening and closing drive assembly includes a rotary drive component and symmetrically arranged upper and lower gears. The upper and lower gears are rotatably connected to the cleaning frame. The upper gear is fixed to the upper housing through an upper connector, and the lower gear is fixed to the lower housing through a lower connector. The meshing point of the upper and lower gears coincides with the rotation center of the hinge. The rotary drive component is located on the cleaning frame, and the output end of the rotary drive component is coaxially fixed with the upper or lower gear.

[0013] Optionally, the cleaning rack is provided with a guide arc groove, the meshing point of the upper gear and the lower gear coincides with the center of the guide arc groove, and both the upper and lower housings are provided with support bolts, which are slidably disposed in the guide arc groove.

[0014] Optionally, the lower housing is provided with collection boxes at both ends of the lower housing. The collection boxes are used to collect the cleaning fluid flowing out from the perforation. The cleaning rack is provided with a clearance drive for driving the collection boxes to move toward the first drive.

[0015] In summary, this application includes at least one of the following beneficial technical effects: 1. By setting up a material trough and a doctor blade mechanism driven by a second and a third driving component respectively, and a cleaning mechanism driven by a first driving component, and coordinating and controlling them all with a unified controller, the movement of the material trough, doctor blade mechanism, and cleaning mechanism is automated. This structure allows the material trough and doctor blade mechanism to be precisely positioned during normal coating; during anilox roller cleaning, the controller can instruct the material trough and doctor blade mechanism to automatically move to a clearance position, while simultaneously driving the cleaning mechanism to approach the anilox roller to perform the cleaning operation. The entire process requires no manual intervention, significantly improving the automation level and work efficiency of equipment operation, and reducing labor costs and operational complexity.

[0016] 2. By setting up independently adjustable front and rear roller frames, driven by the first and second lifting components respectively, the height of the corner rolls installed on them can be adjusted independently and flexibly. This allows the controller to precisely control the position of the front and rear roller frames relative to the anilox rollers according to process requirements, thereby optimizing the tension distribution of the substrate, the contact corner, and the coating transfer process, enhancing the flexibility of process adjustment and the adaptability of coating effect.

[0017] 3. Through the configuration of the upper and lower chambers, the liquid inlet, hinges, and the opening / closing drive assembly, during the cleaning process, the first drive unit can drive the open cleaning frame to move to a preset position on the side of the anilox roller. Subsequently, the opening / closing drive assembly drives the upper and lower chambers to close, allowing cleaning fluid to enter through the liquid inlet during the closing process. After the cleaning chamber is completely closed and covers the anilox roller surface, the anilox roller is driven to rotate, allowing the roller surface and cells of the anilox roller to be fully immersed and rinsed by the cleaning fluid in the relatively enclosed cavity. This method differs from traditional cleaning methods that use high-pressure water jet impact or mechanical friction with brushes, effectively avoiding erosion or wear on the surface of the anilox roller, thus protecting the precision surface structure of the anilox roller. At the same time, the rotation of the anilox roller will cause the cleaning fluid around it to continuously tumble and agitate, enhancing the collision and exchange between the cleaning fluid and the residual coating in the cells, thereby improving the thoroughness and efficiency of the cleaning. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of an intelligent coating head according to an embodiment of this application.

[0019] Figure 2 This is a structural schematic diagram illustrating the positional relationship between the anilox roller, the feed trough, the scraper mechanism, and the cleaning mechanism in the embodiments of this application.

[0020] Figure 3 This is a cross-sectional view illustrating an embodiment of this application.

[0021] Figure 4 This is a schematic diagram illustrating the structure of the scraper mechanism in the embodiments of this application.

[0022] Figure 5 This is a schematic diagram illustrating the structure of the cleaning mechanism in the embodiments of this application.

[0023] Figure 6 This is a schematic diagram illustrating the structure of the cleaning box in the embodiments of this application.

[0024] Figure 7 This is a cross-sectional view illustrating the opening and closing drive component in the embodiments of this application.

[0025] Explanation of reference numerals in the attached drawings: 1. Frame; 11. First drive component; 12. Second drive component; 13. Third drive component; 14. First sensor; 15. Second sensor; 16. Third sensor; 17. Front roller frame; 171. First lifting component; 172. Fourth sensor; 18. Rear roller frame; 181. Second lifting component; 182. Fifth sensor; 2. Anilox roller; 3. Feed trough; 4. Scraper mechanism; 5. Cleaning mechanism; 51. Cleaning rack; 511, guide arc groove; 52, upper box; 521, groove; 53, lower box; 531, liquid inlet; 54, perforation; 55, hinge; 56, opening and closing drive assembly; 561, rotation drive component; 562, upper gear; 563, lower gear; 564, upper connector; 565, lower connector; 57, support bolt; 58, collection box; 59, avoidance drive component; 6, controller; 7, corner roller; 8, substrate. Detailed Implementation

[0026] The following combination Figures 1-7 This application will be described in further detail below.

[0027] Example:

[0028] This application discloses an intelligent coating head. (Refer to...) Figure 1 and Figure 2An intelligent coating head includes a frame 1 and an anilox roller 2 rotatably mounted on the frame 1. The length direction of the frame 1 is the same as the axial direction of the anilox roller 2. The frame 1 is also provided with a material trough 3, a scraper mechanism 4, and a cleaning mechanism 5. The material trough 3 is located below the anilox roller 2 and is used to supply coating to the anilox roller 2. The scraper mechanism 4 is located on the rear side of the anilox roller 2 and is used to scrape off excess coating from the surface of the anilox roller 2 to control the amount of coating transferred to the substrate 8. The cleaning mechanism 5 is located on the front side of the anilox roller 2 and is used to clean the anilox roller 2.

[0029] Reference Figures 1-3 The material trough 3 is slidably connected to the side wall of the frame 1 in a vertical direction. The scraper mechanism 4 and the cleaning mechanism 5 are slidably connected to the frame 1 in the width direction. A first drive member 11, a second drive member 12, and a third drive member 13 are also fixed on the frame 1. The first drive member 11 drives the cleaning mechanism 5 closer to or away from the anilox roller 2. The output end of the second drive member 12 is fixed to the bottom of the material trough 3. The output end of the third drive member 13 is connected to the scraper mechanism 4 and drives the scraper mechanism 4 closer to or away from the anilox roller 2. A controller 6 is installed on one side of the frame 1. The controller 6 is signal-connected to the first drive member 11, the second drive member 12, and the third drive member 13. In this embodiment, the first drive member 11, the second drive member 12, and the third drive member 13 are all pneumatic components.

[0030] Reference Figure 3 and Figure 4 The frame 1 is also fixedly equipped with a first sensor 14, a second sensor 15 and a third sensor 16. The first sensor 14 is used to detect the position of the cleaning mechanism 5, the second sensor 15 is used to detect the position of the material tank 3, and the third sensor 16 is used to detect the position of the scraper mechanism 4. The first sensor 14, the second sensor 15 and the third sensor 16 are all connected to the controller 6.

[0031] During normal coating, the material trough 3 and the scraper mechanism 4 can be precisely positioned. When cleaning the anilox roller 2, the controller 6 can instruct the material trough 3 and the scraper mechanism 4 to automatically move away to a clearance position, while driving the cleaning mechanism 5 to approach the anilox roller 2 to perform the cleaning operation. The entire process does not require manual intervention, which improves the automation level and work efficiency of the equipment operation and reduces labor costs and operational complexity.

[0032] Reference Figures 1-3The coating head also includes a front roller frame 17 and a rear roller frame 18, which are slidably connected to the frame 1 in a vertical direction. The front roller frame 17 and the rear roller frame 18 are located on opposite sides above the anilox roller 2. Corner rollers 7 are rotatably connected to the front roller frame 17 and the rear roller frame 18, respectively. The substrate 8 passes through the corner rollers 7 of the front roller frame 17 and the rear roller frame 18 from below. The corner rollers 7 of the front roller frame 17 determine the contact angle and initial tension of the substrate 8 before it enters the coating area of ​​the anilox roller 2; the corner rollers 7 of the rear roller frame 18 determine the departure angle of the substrate 8 when it leaves the anilox roller 2, and affect the transfer and initial shaping of the wet coating. A first lifting component 171 for driving the front roller frame 17 to rise and fall and a second lifting component 181 for driving the rear roller frame 18 to rise and fall are fixedly installed on the frame 1. Both the first lifting component 171 and the second lifting component 181 are lifting cylinders and are respectively connected to the controller 6 via signals. The frame 1 is also fixedly equipped with a fourth sensor 172 for detecting the position of the front roller frame 17 and a fifth sensor 182 for detecting the position of the rear roller frame 18. Both the fourth sensor 172 and the fifth sensor 182 are connected to the controller 6. Thus, during use, the controller 6 can precisely control the positions of the front and rear corner rollers 7 relative to the anilox roller 2 according to process requirements, thereby optimizing the tension distribution of the substrate 8, the contact corner, and the coating transfer process, enhancing the flexibility of process adjustment and the adaptability of coating effect.

[0033] When cleaning is required, the controller 6 controls the second drive component 12, the third drive component 13, the first lifting component 171, and the second lifting component 181 to move the material trough 3, the scraper mechanism 4, the front roller frame 17, and the rear roller frame 18 to their respective avoidance positions away from the anilox roller 2, and controls the first drive component 11 to drive the cleaning mechanism 5 to the working position. After cleaning is completed, the controller 6 controls the first drive component 11 to drive the cleaning mechanism 5 to reset, and controls the second drive component 12, the third drive component 13, the first lifting component 171, and the second lifting component 181 to move the material trough 3, the scraper mechanism 4, the front roller frame 17, and the rear roller frame 18 back to their respective preset working positions. In this way, the coating head realizes fully automatic operation from working state to cleaning state and then reset back to working state, shortening the time required for cleaning preparation and production resumption, and avoiding errors and safety hazards that may be caused by manual operation.

[0034] Reference Figure 2 and Figure 5 The cleaning mechanism 5 includes a cleaning frame 51 and a cleaning box disposed on the cleaning frame 51. The cleaning box is openable and closable. The cleaning frame 51 is slidably connected to the frame 1 along the width direction of the frame 1. The front side of the cleaning frame 51 is connected to the output end of the first drive member 11.

[0035] Reference Figure 3 , Figures 5-7The cleaning box includes an upper box 52 and a lower box 53 that are interlocked. Both ends of the upper box 52 and the lower box 53 have through holes 54 through which the roller shaft of the anilox roller 2 can pass. A liquid inlet 531 for connecting an external cleaning hose is fixedly connected to the center of the front side of the lower box 53. The upper box 52 and the lower box 53 are connected near the first driving member 11 by a hinge 55. The cleaning frame 51 is equipped with an opening and closing drive assembly 56 for driving the upper box 52 and the lower box 53 to open and close. To improve the sealing of the relative contact surfaces when the upper box 52 and the lower box 53 are closed, a groove 521 is provided at the lower end of the upper box 52, and a sealing strip is fixedly installed in the groove 521.

[0036] During the cleaning process, the first drive unit 11 drives the open cleaning frame 51 to move to a preset position on the side of the anilox roller 2. Then, the opening and closing drive assembly 56 drives the upper box 52 and the lower box 53 to close, allowing cleaning fluid to enter through the inlet pipe 531 during the closing process. After the cleaning box is completely closed and covers the surface of the anilox roller 2, the anilox roller 2 is driven to rotate, so that the surface of the anilox roller 2 and the cells are fully immersed and rinsed by the cleaning fluid in the relatively closed cavity. This method is different from the traditional cleaning method that uses high-pressure water jet impact or mechanical friction of brushes, and can effectively avoid erosion or wear on the surface of the anilox roller 2, thereby protecting the precision surface structure of the anilox roller 2. At the same time, the rotation of the anilox roller 2 will cause the cleaning fluid around it to continuously tumble and disturb, enhancing the collision and exchange between the cleaning fluid and the residual coating in the cells, thereby improving the thoroughness and efficiency of cleaning.

[0037] Reference Figures 5-7 The opening and closing drive assembly 56 includes a rotary drive component 561 and symmetrically arranged upper gear 562 and lower gear 563. Both upper gear 562 and lower gear 563 are rotatably connected to the cleaning frame 51. The upper gear 562 is fixed to the upper housing 52 via an upper connector 564, which is integrally formed on one side of the circumferential surface of the upper gear 562. The lower gear 563 is fixed to the lower housing 53 via a lower connector 565, which is integrally formed on one side of the circumferential surface of the lower gear 563. The meshing point of the upper gear 562 and lower gear 563 coincides with the rotation center of the hinge 55. The rotary drive component 561 is fixedly mounted on the cleaning frame 51, and its output end is coaxially fixed with either the upper gear 562 or the lower gear 563. In this embodiment, the rotary drive component 561 is a rotary cylinder. In use, the upper gear 562 can be driven to rotate by rotating the drive component 561. Through the meshing transmission of the gear pair, the upper box 52 and the lower box 53 are driven to open and close symmetrically around the rotation center of the hinge 55 in a synchronous and reverse manner, ensuring that the opening and closing action of the cleaning box is smooth, accurate and fast.

[0038] Reference Figure 6 and Figure 7The cleaning rack 51 has guide grooves 511 on both side walls, and the meshing points of the upper gear 562 and lower gear 563 coincide with the center of the guide grooves 511. Support bolts 57 are fixed to both side walls of the upper housing 52 and lower housing 53, and these support bolts 57 are slidably positioned within their respective adjacent guide grooves 511. This ensures that the movement trajectory of the upper housing 52 and lower housing 53 strictly follows an arc centered on the hinge 55 axis throughout the entire opening and closing stroke. Simultaneously, the cooperation between the support bolts 57 and the guide grooves 511 provides guidance and reliably connects the movable ends of the upper housing 52 and lower housing 53 to the cleaning rack 51, forming a stable connection point. This effectively prevents the cleaning box from shifting, jamming, or becoming structurally unstable during opening and closing due to suspension or force.

[0039] Reference Figure 5 Collection boxes 58 are slidably mounted on the lower sides of both ends of the lower housing 53. The collection boxes 58 collect cleaning fluid flowing out from the perforation 54. A clearance drive component 59, which is a cylinder, is fixedly installed on the cleaning frame 51 to drive the collection boxes 58 toward the first drive component 11. During the cleaning process, the collection boxes 58 can catch the cleaning fluid leaking from the gap between the perforation 54 and the anilox roller 2 shaft, preventing it from contaminating the equipment and working environment. The clearance drive component 59 can drive the collection boxes 58 to move away when the cleaning tank needs to be opened or closed, or when other maintenance is required, avoiding interference with the opening and closing movement of the cleaning tank.

[0040] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An intelligent coating head, comprising a frame (1) and an anilox roller (2) rotatably mounted on the frame (1), characterized in that, Also includes: A material trough (3) is located below the anilox roller (2) and is slidably mounted on the frame (1) in the vertical direction; a scraper mechanism (4) is located on one side of the anilox roller (2) and is movably connected to the frame (1); a cleaning mechanism (5) is located on the side of the anilox roller (2) away from the scraper mechanism (4) and is movably connected to the frame (1); a first drive member (11) is located on the frame (1) and is used to drive the cleaning mechanism (5) to approach or move away from the anilox roller (2); a second drive member (12) is located on the frame (1) and is connected to the material trough (3); a third drive member (13) is located on the frame (1) and is used to drive the scraper mechanism (4) to approach or move away from the anilox roller (2); and a controller (6) is signal-connected to the first drive member (11), the second drive member (12), and the third drive member (13), respectively.

2. The intelligent coating head according to claim 1, characterized in that, Also includes: The first sensor (14) is used to detect the position of the cleaning mechanism (5); the second sensor (15) is used to detect the position of the material tank (3); the third sensor (16) is used to detect the position of the scraper mechanism (4); the first sensor (14), the second sensor (15), and the third sensor (16) are all connected to the controller (6) via signals.

3. The intelligent coating head according to claim 2, characterized in that: It also includes a front roller frame (17) and a rear roller frame (18) mounted on the frame (1). The front roller frame (17) and the rear roller frame (18) are located on the upper sides of the anilox roller (2), respectively. Corner rollers (7) are rotatably connected to the front roller frame (17) and the rear roller frame (18). The frame (1) is provided with a first lifting member (171) for driving the front roller frame (17) to rise and fall and a second lifting member (181) for driving the rear roller frame (18) to rise and fall. The first lifting member (171) and the second lifting member (181) are respectively connected to the controller (6) via signals.

4. The intelligent coating head according to claim 3, characterized in that: The frame (1) is equipped with a fourth sensor (172) for detecting the position of the front roller frame (17) and a fifth sensor (182) for detecting the position of the rear roller frame (18). Both the fourth sensor (172) and the fifth sensor (182) are connected to the controller (6) via signals.

5. The intelligent coating head according to claim 4, characterized in that, The controller (6) is configured to: when cleaning is required, control the second drive member (12), the third drive member (13), the first lifting member (171) and the second lifting member (181) to move the material trough (3), the scraper mechanism (4), the front roller frame (17) and the rear roller frame (18) to their respective avoidance positions away from the anilox roller (2), and control the first drive member (11) to drive the cleaning mechanism (5) to move to the working position; after cleaning is completed, control the first drive member (11) to drive the cleaning mechanism (5) to reset, and control the second drive member (12), the third drive member (13), the first lifting member (171) and the second lifting member (181) to move the material trough (3), the scraper mechanism (4), the front roller frame (17) and the rear roller frame (18) back to their respective preset working positions.

6. The intelligent coating head according to claim 1, characterized in that: The cleaning mechanism (5) includes a cleaning frame (51) and a cleaning box disposed on the cleaning frame (51). The cleaning box is openable and closable. The cleaning frame (51) is slidably connected to the frame (1) along the width direction of the frame (1). The cleaning frame (51) is connected to the output end of the first driving member (11).

7. The intelligent coating head according to claim 6, characterized in that: The cleaning box includes an upper box (52) and a lower box (53) that are interlocked. Both ends of the upper box (52) and the lower box (53) are provided with through holes (54) through which the roller shaft of the anilox roller (2) can pass. The lower box (53) is provided with an inlet (531) for connecting an external cleaning hose. The upper box (52) and the lower box (53) are connected by a hinge (55) on the side near the first driving member (11). The cleaning frame (51) is provided with an opening and closing drive assembly (56) for driving the upper box (52) and the lower box (53) to open and close.

8. The intelligent coating head according to claim 7, characterized in that: The opening and closing drive assembly (56) includes a rotary drive component (561) and symmetrically arranged upper gear (562) and lower gear (563). The upper gear (562) and lower gear (563) are rotatably connected to the cleaning rack (51). The upper gear (562) is fixed to the upper housing (52) through the upper connector (564), and the lower gear (563) is fixed to the lower housing (53) through the lower connector (565). The meshing point of the upper gear (562) and the lower gear (563) coincides with the rotation center of the hinge (55). The rotary drive component (561) is located on the cleaning rack (51), and the output end of the rotary drive component (561) is coaxially fixed with the upper gear (562) or the lower gear (563).

9. The intelligent coating head according to claim 8, characterized in that: The cleaning rack (51) is provided with a guide arc groove (511), and the meshing point of the upper gear (562) and the lower gear (563) coincides with the center of the guide arc groove (511). The upper box (52) and the lower box (53) are both provided with support bolts (57), and the support bolts (57) are slidably disposed in the guide arc groove (511).

10. The intelligent coating head according to claim 7, characterized in that: The lower housing (53) has collection boxes (58) on its lower sides at both ends. The collection boxes (58) are used to collect the cleaning fluid flowing out from the perforation (54). The cleaning rack (51) is provided with a clearance drive (59) for driving the collection boxes (58) to move toward the first drive (11).

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