CN217447623U - Floor washing machine with reverse auxiliary force - Google Patents

Abstract

The utility model discloses a floor cleaning machine with reverse auxiliary force. Comprises a handle, a liquid storage bin, a machine body, a cleaning component and a reverse auxiliary driving mechanism. The cleaning assembly is detachably arranged on the machine body, and the reverse auxiliary driving mechanism is arranged on the machine body and is positioned on the side, opposite to the advancing direction, of the cleaning assembly, namely the reverse auxiliary driving mechanism is positioned on the rear side of the cleaning assembly. The floor washing machine has the function of providing auxiliary force for reverse dragging. When a user uses the floor washing machine to work and the floor washing machine moves in the direction opposite to the driving direction of the cleaning assembly, the reverse auxiliary driving mechanism can provide auxiliary force opposite to the advancing direction of the cleaning assembly, so that the dragging force of the user is reduced.

Description

Floor washing machine with reverse auxiliary force

Technical Field

The utility model relates to a domestic cleaning device field, in particular to floor cleaning machine with reverse auxiliary force.

Background

With the changing market of consumers, the cleaning equipment industry is developing new applications to meet the needs of different scenes, including the production of floor-washing machines of the type that clean the floor by the rotation of a rolling brush.

When the user uses this washing machine work, the direction of drive of clean subassembly is forward, if the pulling washing machine carries out the back direction and drags, the drive of clean subassembly can cause the hindrance.

SUMMERY OF THE UTILITY MODEL

According to one aspect of the utility model, a floor washing machine with reverse auxiliary force is provided, which comprises a machine body, a power part and a power part, wherein the power part is arranged on the machine body;

the cleaning component is arranged on the machine body and is in driving connection with the power part;

the reverse auxiliary driving mechanism is arranged on the machine body and comprises a pulley and a driving piece, the driving piece is arranged on the machine body, the pulley is arranged at the driving end of the driving piece,

the reverse assist drive mechanism is capable of providing an assist force opposite to the direction of advancement of the cleaning assembly.

The floor washing machine has the function of providing auxiliary force for reverse dragging. When a user uses the floor washing machine to work and the floor washing machine moves in the direction opposite to the driving direction of the cleaning assembly, the reverse auxiliary driving mechanism can provide auxiliary force opposite to the advancing direction of the cleaning assembly, so that the dragging force of the user is reduced.

In some embodiments, the reverse auxiliary drive mechanism further comprises a sensor in signal connection with the drive member;

the sensor can sense the rotation direction/rotation trend of the pulley; or, the sensor can sense the moving direction/moving trend of the body.

Therefore, the state of the floor washing machine is detected through the sensor, and the reverse auxiliary driving mechanism is automatically controlled.

In some embodiments, the reverse assist drive mechanism further comprises a controller coupled to the drive member.

The reverse assist drive mechanism is thereby actively opened by the controller.

In some embodiments, there are two reverse auxiliary driving mechanisms, and the two reverse auxiliary driving mechanisms are symmetrically distributed.

Thus, the counter auxiliary drive mechanisms, both counter auxiliary drive mechanisms may be controlled synchronously or separately differentially.

In some embodiments, the reverse assist drive mechanism is located on the opposite side of the cleaning assembly from the forward direction.

The auxiliary reverse auxiliary drive mechanism is thus located behind the cleaning assembly.

In some embodiments, the first roller body is rotatably arranged on the machine body and is in transmission connection with the power part of the machine body;

the second roller body is rotatably arranged on the machine body;

the cleaning belt is connected to the first roller body and the second roller body, and the first roller body and the second roller body are driven through the cleaning belt.

In some embodiments, the surface of the first roller body is sleeved with a first anti-slip layer, the surface of the first anti-slip layer is provided with first anti-slip lines, and the first anti-slip lines are in contact with the inner surface of the cleaning belt.

From this, set up first skid resistant course on first roll body in this cleaning assembly very much, the internal surface contact of first skid resistant course and clean area when first roll body is carried out the transmission to clean area, can avoid clean area to take place the phenomenon of skidding to improve the clean efficiency of clean area to ground. The utility model discloses simple structure, practicality, through set up can tight first skid resistant course that rises.

In some embodiments, the first roller body is provided with a first transmission insection, the second roller body is provided with a second transmission insection at two ends of the surface, the cleaning belt is provided with a transmission belt at two ends of the inner surface, and the first transmission insection and the second transmission insection are both meshed with the transmission belt.

Therefore, the utility model provides a be used for installing two roller roll brush formula clean subassembly on the organism of floor cleaning machine specially, set up the insection on first roll body, second roll body very much in this clean subassembly to set up the drive belt on clean the area, when first roll body, second roll body, clean area carry out the transmission, can avoid clean area to take place the phenomenon of skidding, axial leap up and the axial skew phenomenon, thereby improve clean area to the clean efficiency on ground the utility model discloses simple structure, practicality.

In some embodiments, the inner surface of the cleaning belt is provided with a convex ring, the surfaces of the first roller body and the second roller body are provided with limit grooves, and the convex ring is embedded into the limit grooves.

Therefore, the utility model provides a be used for installing two roller roll brush formula's on floor cleaning machine's organism cleaning assembly specially. In order to solve the problem of axial deviation of the cleaning belt in the work, the inner surface of the cleaning belt is provided with a convex ring, the first roller body and the second roller body are respectively provided with a limiting groove, and when the cleaning belt is installed on the first roller body and the second roller body, the convex ring is embedded into the limiting groove, so that the axial deviation of the cleaning belt in the rotating process can be prevented.

In some embodiments, the cleaning tape comprises a socketing layer, a cleaning layer wound in a tape shape and conforming to an outer surface of the socketing layer

Therefore, the cleaning layer is wound on the surface of the sleeving layer in a strip shape, the attaching direction of the cleaning layer is approximately the same as the rotating direction in the rotating process of the cleaning belt, and the cleaning layer can be prevented from falling off from the sleeving layer; and in the process of high-speed rotation of the cleaning belt, the outer cleaning layer is only bonded with the sleeving layer more and more tightly, so that the service life of the cleaning belt is prolonged.

Drawings

Fig. 1 is a schematic plan view of a floor washing device according to an embodiment of the present invention.

Fig. 2 is a schematic perspective view of a portion of the structure shown in fig. 1.

Fig. 3 is an exploded perspective view of a portion of the structure shown in fig. 2.

Figure 4 is a perspective view of the cleaning assembly shown in the partial configuration of figure 2.

Fig. 5 is a perspective view of the cleaning belt of the cleaning assembly of fig. 4.

Fig. 6 is a schematic cross-sectional view of a portion of the structure shown in fig. 2.

Fig. 7 is a cross-sectional view of the cleaning assembly shown in fig. 4.

Fig. 8 is a schematic sectional view showing a part of the structure of the second embodiment of the present invention in one direction.

Fig. 9 is a schematic cross-sectional view of the partial structure shown in fig. 8 in another direction.

Fig. 10 is a partially enlarged schematic view of fig. 9.

Fig. 11 is a schematic sectional view showing a part of the structure of the third embodiment of the present invention in one direction.

Fig. 12 is a schematic cross-sectional view of the partial structure shown in fig. 11 in another direction.

Fig. 13 is a partially enlarged structural view of fig. 12.

Fig. 14 is a schematic cross-sectional view of a portion of the structure shown in fig. 1.

Reference numbers in the figures: 100-handle, 200-liquid storage bin, 300-machine body, 310-main body, 320-installation side plate, 330-tension wheel, 340-cover cap, 301-liquid spraying part, 302-power part, 303-suction channel, 400-cleaning component, 410-first roller body, 411-first anti-slip layer, 412-first transmission insection, 413-limit groove, 420-second roller body, 421-second anti-slip layer, 422-second transmission insection, 430-cleaning belt, 431-cleaning layer, 432-socket layer, 4321-third transmission insection, 4322-convex ring, 433-500-sewage bin, 600-reverse auxiliary driving mechanism, 610-pulley, 620-driving belt, 630-sensor, 640-controller,

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Example one

Fig. 1 to 3 schematically show a floor washing device according to an embodiment of the present invention, which cleans a floor by rolling a cleaning belt 430. The floor washing device comprises a handle 100, a liquid storage bin 200, a machine body 300, a cleaning assembly 400 and a reverse auxiliary driving mechanism 500. The handle 100 is disposed on the liquid storage bin 200, the body 300 is disposed at a lower end position of the liquid storage bin 200, the cleaning assembly 400 is detachably disposed on the body 300, and the reverse auxiliary driving mechanism 600 is disposed on the body 300 and located at a side of the cleaning assembly 400 opposite to the advancing direction, that is, the reverse auxiliary driving mechanism 600 is located at a rear position of the cleaning assembly 400. In particular, the amount of the solvent to be used,

the handle 100 is arranged at the upper end of the liquid storage bin 200 in a detachable mode, and the handle 100 can be contracted on the liquid storage bin 200, so that the length of the handle 100 can be adjusted to meet the heights of different users.

The liquid storage bin 200 can store cleaning liquid, which can be common clear water, water added with a cleaning agent or directly prepared finished cleaning liquid;

the machine body 300 is arranged at the lower end of the liquid storage bin 200, the machine body 300 is provided with a liquid spraying part 301 and a power part 302, the liquid spraying part 301 is communicated with the liquid storage bin 200 through a flow channel, a spray head of the liquid spraying part 301 is aligned with the cleaning assembly 400, and the cleaning assembly 400 is arranged on the machine body 300 and is in driving connection with the power part 302;

generally, the machine body 300 is further provided with a suction channel 303 and a sewage bin 500, negative pressure can be formed in the suction channel 303 by using an exhaust fan, and then water which is cleaned on the ground enters the sewage bin 500 through suction, so that sewage is recycled, moisture cannot be remained on an object to be cleaned, and the cleaning effect is ensured.

Referring to fig. 3 to 5, in the cleaning assembly 400, the cleaning assembly 400 includes a first roller body 410, a second roller body 420, and a cleaning belt 430. The first roller 410 is rotatably arranged on the machine body 300 and is in transmission connection with the power part 302 of the machine body 300; the second roller 420 is also rotatably disposed on the body 300; the cleaning belt 430 is detachably connected to the first roller 410 and the second roller 420, and the first roller 410 and the second roller 420 are driven by the cleaning belt 430. The first roller 410 and the second roller 420 are detachably attached to the housing 300. Body 300 includes main part 310, installation curb plate 320, is equipped with the mounting groove on the main part 310, and one side of main part 310 is located to installation curb plate 320 detachably, forms the mounting groove between installation curb plate 320, the main part 310, and the one end at the mounting groove is established to the drive end of power portion 302, and first roll body 410, second roll body 420 are all detachably located in the mounting groove, and first roll body 410 can be dismantled with the drive end of power portion 302 and be connected. Preferably, one ends of the first roller 410 and the second roller 420 are both arranged on the mounting side plate 320 in a bearing manner and are non-detachably connected, and the other ends of the first roller 410 and the second roller 420 are detachably connected with the machine body 300; in this way, the first roller 410, the second roller 420, and the cleaning belt 430 can be removed together by withdrawing the mounting side plate 320, which is convenient and fast.

The floor washing machine has the function of providing auxiliary force for reverse dragging. When a user works with the floor washing machine and moves the floor washing machine in a direction opposite to the driving direction of the cleaning assembly 400, the reverse auxiliary driving mechanism 600 can provide an auxiliary force opposite to the advancing direction of the cleaning assembly 400, thereby reducing the user's dragging force.

The traditional rolling brush is manufactured by flocking on a cylindrical roller, or the flocking is directly transferred on the rolling brush by a strong adhesion mode. This kind of mode just can guarantee that fine hair and round brush are complete integral type, guarantees clean effect, and traditional round brush does not have the scheme of any set of round brush cover of taking fine hair because can skid each other like this to influence clean effect. Although the cleaning effect is ensured, the fluff of the integral rolling brush is easy to wear. When the traditional rolling brush is worn, the whole rolling brush can only be replaced, the replacement cost is very high, and the resource saving is not facilitated. According to the cleaning belt 430, the first roller body 410 and the second roller body 420 are sleeved with the cleaning belt 430, so that a detachable structure is formed, when the cleaning belt 430 is damaged to cause poor cleaning effect, the cleaning belt 430 with the annular structure can be replaced independently, the cleaning belt 430 with the annular structure serves as a consumable, the stickiness between a manufacturer and a user is kept, and the purchase rate of the cleaning belt 430 of the user is increased. Meanwhile, different models of the cleaning belts 430 may be provided to allow the user to selectively purchase them. Different types of cleaning belts 430 can be provided with different thicknesses of fluff, such as the cleaning belt 430 with the fine fluff and the cleaning belt 430 with the coarse fluff, and when a user mainly cleans a relatively coarse floor (such as a cement floor), the cleaning belt 430 with the coarse fluff can be selected as much as possible, so that the cleaning belt 430 has a longer service life. When the user primarily cleans a relatively flat floor (e.g., wood), the choice of the cleaning strip 430 with nap may be made.

Referring to fig. 3, the surface of the first roller 410 is sleeved with a first anti-slip layer 411, and first anti-slip patterns are arranged on the surface of the first anti-slip layer 411 and contact with the inner surface of the cleaning belt 430. After the cleaning belt 430 is installed, the surface of the first anti-slip layer 411 is tensioned and closely contacted with the inner surface of the cleaning belt 430, and when the first roller body 410 transmits the cleaning belt 430, the cleaning belt 430 can be prevented from slipping, so that the cleaning efficiency of the cleaning belt 430 on the ground is improved.

Referring to fig. 3, a second anti-slip layer 421 is sleeved on the surface of the second roller body 420, second anti-slip patterns are arranged on the surface of the second anti-slip layer 421, and the second anti-slip patterns contact with the inner surface of the cleaning belt 430. The surface of the second roller body 420 is provided with an anti-slip layer, which can provide tension to the cleaning belt 430, further prevent the cleaning belt 430 from slipping in the rotating process, and improve the cleaning efficiency of the ground.

Referring to fig. 3, the first anti-slip layer 411 and the second anti-slip layer 421 are both soft rubber, and the first anti-slip layer 411 and the second anti-slip layer 421 are both in a plurality of stripe shapes, a plurality of twill shapes, a plurality of block shapes or a plurality of granular shapes. In this embodiment, the granules are preferably distributed in a rectangular array, and are uniformly distributed, which helps to uniformly distribute the tension of the anti-slip layer.

Referring to fig. 6 and 9 to 10, in order to solve the problem of the axial displacement of the cleaning belt 430, protruding rings 4322 are provided on both sides of the inner surface of the cleaning belt 430, and both ends of the first roller body 410 and the second roller body 420 are provided with the spacing grooves 413, so that when the cleaning belt 430 is mounted on the first roller body 410 and the second roller body 420, the protruding rings 4322 are inserted into the spacing grooves 413, thereby preventing the axial displacement of the cleaning belt 430 during the rotation. In this embodiment, the shape of the limiting groove 413 and the convex ring 4322 is preferably trapezoidal, especially isosceles trapezoid, which has a better limiting effect.

Referring to fig. 3-5, the cleaning belt 430 includes a cleaning layer 431 and a socket layer 432, the cleaning layer 431 is wound around and attached to the surface of the socket layer 432, and the third transmission insections 4321 and the raised rings 4322 are disposed at two ends of the inner surface of the socket layer 432. The cleaning belt 430 is composed of two parts, a sleeve layer 432 is used for driving with the roller body, and a cleaning layer 431 is used for cleaning by contacting with the ground. In this embodiment, the cleaning layer 431 is the above-mentioned wool layer, and the sleeving layer 432 may be an integrally formed elastic silica gel object cylinder or an elastic silica gel object cylinder spliced end to end. In this embodiment, the socket layer 432 may be an integrally formed elastic silicone cylinder.

Referring to fig. 5, the cleaning layer 431 is spirally wound, the cleaning layer 431 is a long strip-shaped object before winding, and the strip-shaped object is spirally wound on the sleeving layer 432 and attached to form the cleaning layer 431; gaps may exist between the wound strips, and the gaps between the cleaning layers 431 may be spliced to each other in order to form the cleaning layers 431 into a non-discrete whole. The cleaning layer 431 is spirally wound on the surface of the sleeving layer 432, and in the rotating process of the cleaning belt 430, the attaching direction of the cleaning layer 431 is approximately the same as the rotating direction, so that the cleaning layer 431 can be prevented from falling off from the sleeving layer 432.

Preferably, the cleaning layers 431 are spliced with each other in an adhesive bonding or sewing manner to further improve the tightness of the cleaning layers 431, and the cleaning layers 431 are spliced with each other in an adhesive bonding or sewing manner to avoid dead cleaning corners.

Referring to fig. 6 to 7, the diameter of the first roller 410 is set larger than that of the second roller 420, the second roller 420 is located at a front position in an advancing direction in which the apparatus is operated, and the first roller 410 is located at a rear of the second roller 420. Meanwhile, the lowest point of the first roller body 410 and the lowest point of the second roller body 420 are ensured to be on the same horizontal plane, namely, the lowest point of the first roller body 410 and the lowest point of the second roller body 420 are tangent to a horizontal line, so that the bottom surface of the cleaning belt 430 can be ensured to have a larger contact area with the cleaning surface. Moreover, the smaller the diameter of the second roller body 420 is, the better the diameter is, and the smaller the diameter of the second roller body 420 is, the smaller the corresponding cleaning dead zone is; meanwhile, the second roller body 420 has a smaller diameter and is located at the front end, so that the whole machine body 300 has a small tip protruding forwards, and the second roller body 420 protruding forwards can extend into some areas with smaller height to perform cleaning work, similar to a bed bottom, cabinet feet and the like.

Referring to fig. 6, a tension wheel 330 is further disposed on the body 300, and the tension wheel 330 is attached to a cleaning belt 430 having a ring structure. Generally, the front upper side of the machine body 300 is provided with the cover 340, an accommodating groove may be formed on an inner wall of the cover 340, a spring is disposed on the accommodating groove, and the tensioning wheel 330 is disposed on the spring, so that the tensioning force of the tensioning wheel 330 is realized by the elastic force of the spring.

Referring to fig. 14, two reverse auxiliary driving mechanisms 600 are provided, and the two reverse auxiliary driving mechanisms 600 are symmetrically disposed. The reverse auxiliary driving mechanism 600 includes a pulley 610 and a driving member 620. The driving member 620 is disposed on the machine body 300, and the pulley 610 is disposed at the driving end of the driving member 620. The reverse auxiliary driving mechanism 600 can provide an auxiliary force opposite to the advancing direction of the cleaning assembly 400. In this embodiment, the driving member 620 is a motor.

The reverse auxiliary drive mechanism 600 further comprises a sensor 630, the sensor 630 being in signal connection with the drive member 620; sensor 630 is capable of sensing the direction/trend of rotation of pulley 610; or, the sensor 630 can sense the moving direction/moving trend of the body 300. The sensor 630 may be a differential sensor, a gyroscope, etc., and is not limited thereto as long as it can recognize a rotation direction/rotation tendency of the pulley 610 or a movement direction/movement tendency of the body 300.

In other embodiments, the reverse assist drive mechanism 600 further includes a controller 640, the controller 640 is disposed on the handle, and the controller 640 is coupled to the drive member 620. The rotation of the driving member 620 is controlled by the control.

Example two

The second embodiment is substantially the same as the first embodiment, and is different from the first embodiment in that the first roller 410, the second roller 420, and the cleaning belt 430 in the first embodiment simply transmit force by friction. In this embodiment, the first roller 410, the second roller 420, and the cleaning belt 430 are not only transmitted by friction, but also have insections between the first roller 410, the second roller 420, and the cleaning belt 430 for force transmission, which specifically includes:

referring to fig. 8 to 10, the first roller 410 has first driving insections 412 at opposite ends of the surface thereof, the second roller 420 has second driving insections 422 at opposite ends of the surface thereof, and the cleaning belt 430 has third driving insections 4321 at opposite ends of the inner surface thereof; the first transmission insections 412 and the second transmission insections 422 are engaged with the third transmission insections 4321. In order to further improve the power transmission efficiency, the surfaces of the first roller body 410, the second roller body 420, and the inner surface of the cleaning belt 430 are provided with power transmission insections, and the power transmission efficiency is improved by the mutual engagement between the insections.

Moreover, the first transmission insection 412 is located between the first anti-slip layer 411 and the limiting groove 413, the second transmission insection 422 is located between the second anti-slip layer 421 and the limiting groove 413, and the third transmission insection 4321 is located inside the limiting convex ring 4322. When the cleaning belt 430 is installed, i.e. the third transmission insection 4321 is engaged with the first transmission insection 412 and the second transmission insection 422, the convex ring 4322 is embedded into the spacing groove 413 to achieve spacing, and the spacing structure is located at the outer side of the insection engaging structure.

EXAMPLE III

The third embodiment is substantially the same as the first embodiment, and the difference is that the first roller 410, the second roller 420, and the cleaning belt 430 in the first embodiment simply rely on friction force to transmit force. In this embodiment, the first roller 410, the second roller 420, and the cleaning belt 430 are not only transmitted by friction, but also have insections between the first roller 410, the second roller 420, and the cleaning belt 430 for force transmission, which specifically includes:

referring to fig. 11 to 13, the first roller 410 has first driving serrations 412 at opposite ends of a surface thereof, the second roller 420 has second driving serrations 422 at opposite ends of a surface thereof, the cleaning belt 430 has a driving belt 433 at opposite ends of an inner surface thereof, and the first driving serrations 412 and the second driving serrations 422 are engaged with the driving belt 433. In order to further improve the power transmission efficiency, the surfaces of the first roller body 410, the second roller body 420, and the inner surface of the cleaning belt 430 are provided with power transmission teeth, and the power transmission efficiency is improved by the mutual engagement between the teeth.

In this embodiment, the first roller 410 and the second roller 420 do not need to be provided with a structure of the limiting groove 413, the transmission belt 433 is disposed on the outermost side of the cleaning belt 430, the first transmission insection 412 is also disposed on the outermost side of the first roller 410, the second transmission insection 422 is also disposed on the outermost side of the second roller 420, and after the cleaning belt 430 is installed, that is, after the transmission belt 433 is engaged with the second transmission insection 422 and the first transmission insection 412, the transmission belt 433 at both ends just forms a limiting fit with the second transmission insection 422 and the first transmission insection 412 at both ends.

What has been described above are only some embodiments of the invention. For those skilled in the art, without departing from the inventive concept, several modifications and improvements can be made, which are within the scope of the invention.

Claims (8)

1. The floor washing machine with the reverse auxiliary force is characterized by comprising

A machine body (300) provided with a power unit (302);

the cleaning assembly (400) is arranged on the machine body (300) and is in driving connection with the power part (302);

the reverse auxiliary driving mechanism (600) is arranged on the machine body (300) and comprises a pulley (610) and a driving part (620), the driving part (620) is arranged on the machine body (300), the pulley (610) is arranged at the driving end of the driving part (620),

the reverse auxiliary driving mechanism (600) can provide an auxiliary force opposite to the advancing direction of the cleaning assembly (400).

2. The floor washing machine with reverse assist as in claim 1, wherein the reverse assist drive mechanism (600) further comprises a sensor (630), the sensor (630) in signal communication with the drive (620);

the sensor (630) is capable of sensing the direction/trend of rotation of the pulley (610); or, the sensor (630) can sense the moving direction/moving trend of the machine body (300).

3. The floor washing machine with reverse assist as in claim 1, wherein the reverse assist drive mechanism (600) further comprises a controller (640), the controller (640) being connected to the drive (620).

4. Floor washing machine with inverted auxiliary power according to claim 1, characterized in that there are two inverted auxiliary drives (600), two inverted auxiliary drives (600) being symmetrically distributed.

5. The floor washing machine with reverse assist as in claim 1, wherein the reverse assist drive mechanism (600) is located on a side of the cleaning assembly (400) opposite the forward direction.

6. The floor washing machine with reverse assisting power according to any one of claims 1-5, characterized in that the first roller body (410) is rotatably arranged on the machine body (300) and is in transmission connection with the power part (302) of the machine body (300);

a second roller body (420) rotatably arranged on the machine body (300);

and the cleaning belt (430) is connected to the first roller body (410) and the second roller body (420), and the first roller body (410) and the second roller body (420) are driven by the cleaning belt (430).

7. Floor washing machine with counter-assistance according to claim 6, characterized in that the surface of the first roller (410) is sheathed with a first anti-slip layer (411), the surface of the first anti-slip layer (411) being provided with first anti-slip threads, which are in contact with the inner surface of the cleaning belt (430).

8. The floor washing machine with the reverse assisting force according to claim 6, characterized in that the first roller body (410) is provided with a first transmission insection (412), the second roller body (420) is provided with a second transmission insection (422) at two end positions of the surface, the cleaning belt (430) is provided with a transmission belt (433) at two end positions of the inner surface, and the first transmission insection (412) and the second transmission insection (422) are both meshed with the transmission belt (433).

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