Weaving winding device

Abstract

The utility model relates to the technical field of knitting winding equipment, and discloses a knitting winding device which comprises a mounting frame, a function box is fixedly mounted on the left side of the mounting frame, a motor is fixedly mounted on the inner wall of the left side of the function box, an output shaft of the motor extends into the mounting frame, a winding mechanism is arranged on the output shaft of the motor, and an adjusting box is arranged in the mounting frame. A tensioning mechanism is arranged in the adjusting box, a first electric push rod is fixedly mounted at the top of the mounting frame, the bottom end of an output shaft of the first electric push rod extends into the mounting frame and is fixedly provided with a lifting plate, and the left side of the lifting plate is slidably connected with the inner wall of the left side of the mounting frame. Compared with the prior art, the device has the following advantages and effects that by arranging the adjusting mechanism, the roller can be driven to be adjusted left and right, the braided fabric can return to a correct winding path again, and the purpose of avoiding the problems of irregular winding, wrinkles and the like caused by deviation of the braided fabric can be achieved.

Description

Technical Field

[0001] This application relates to the field of knitting winding equipment technology, and in particular to a knitting winding device. Background Technology

[0002] Plastic weaving machinery is widely used in the food and pharmaceutical packaging industry, primarily for producing high-strength, durable plastic woven bags. The weaving and winding of the plastic mesh is a crucial step in the production process, directly affecting the quality and appearance of the final product. Currently, common plastic weaving machinery on the market suffers from uneven mesh during the winding stage. This not only affects the product's appearance but can also lead to reduced efficiency and material waste in subsequent processing. As the food and pharmaceutical packaging industry continues to demand higher product quality, the requirements for the flatness of the plastic mesh during winding are also becoming increasingly stringent.

[0003] In practical use, we have found that traditional knitting winding devices have many problems. On the one hand, during the winding process, the knitted fabric is prone to wrinkles and loosening due to uneven tension, resulting in loose winding and poor flatness, which seriously affects the appearance and performance of the product. On the other hand, the knitted fabric is prone to generating static electricity during winding. Static electricity not only attracts dust and other impurities, reducing product quality, but may also cause safety hazards and threaten production safety. In addition, existing devices are also unable to effectively deal with the problem of knitted fabric shifting during the winding process. Shifting will cause irregular winding, increasing the difficulty and cost of subsequent processing. Therefore, we have proposed a knitting winding device to solve the above problems. Utility Model Content

[0004] The purpose of this application is to address the shortcomings of existing technologies, such as: easy to cause loose winding, poor flatness, easy to cause deviation during winding, seriously affecting the appearance and performance of the product, and inability to eliminate static electricity, which may cause safety hazards. Therefore, a braiding winding device is proposed.

[0005] The above-mentioned technical objective of this application is achieved through the following technical solution: a braiding and winding device, including a mounting frame, a function box fixedly mounted on the left side of the mounting frame, a motor fixedly mounted on the inner wall of the left side of the function box, the motor output shaft extending into the mounting frame, a winding mechanism being provided on the motor output shaft, an adjustment box being provided inside the mounting frame, a tensioning mechanism being provided inside the adjustment box, a first electric push rod fixedly mounted on the top of the mounting frame, the bottom end of the output shaft of the first electric push rod extending into the mounting frame, a lifting plate fixedly mounted on the bottom end of the output shaft of the first electric push rod, the left side of the lifting plate being slidably connected to the inner wall of the left side of the mounting frame, an adjustment mechanism being provided on the right side of the lifting plate; the bottom of the lifting plate being slidably connected to the top of the adjustment box, a pressing mechanism being provided below the adjustment box, a support plate fixedly mounted on the inner wall of the bottom of the mounting frame, a reciprocating mechanism being provided between the support plate and the function box, a controller being provided on the front side of the function box, a photoelectric sensor being provided on the inner wall of the rear side of the mounting frame, and the photoelectric sensor being electrically connected to the controller.

[0006] A further feature of this application is that the winding mechanism includes a rotating roller and a winding drum, a rotating roller is fixedly sleeved on the motor output shaft, a winding drum is sleeved on the rotating roller, and a limit mechanism is provided between the winding drum and the rotating roller.

[0007] By adopting the above technical solution and by setting up a winding mechanism, the motor can drive the winding drum to rotate, thereby achieving the purpose of winding the woven fabric through the winding drum.

[0008] A further feature of this application is that the limiting mechanism includes a rod groove and an insert rod. A rod groove is provided on the right side of the rotating roller, and an insert rod is fixedly installed on the inner wall of the right side of the take-up drum. The insert rod is engaged with the rod groove. An external thread is provided on the motor output shaft, and a nut is installed on the external thread. The nut is compatible with the take-up drum.

[0009] By adopting the above technical solution and setting a limiting mechanism, the rod groove can be tightly engaged with the insertion rod, and the nut can axially limit the winding drum. This ensures that the winding drum will not move axially or radially during the winding process, thereby guaranteeing the stability and accuracy of winding.

[0010] A further configuration of this application is as follows: the tensioning mechanism includes a sliding plate, a sliding column, and a spring; the sliding plate is slidably installed inside the adjustment box; a sliding column is fixedly installed at the bottom of the sliding plate; the bottom end of the sliding column extends into the adjustment box; a spring is fixedly installed at the top of the sliding plate; a pressure sensor is provided on the inner wall of the top of the adjustment box; the pressure sensor is electrically connected to the controller; and the spring is adapted to the pressure sensor.

[0011] By adopting the above technical solution and by setting up a tensioning mechanism, the spring can use its elastic potential energy to press against the sliding column, thereby achieving the purpose of pressing the roller frame and the roller downward.

[0012] A further configuration of this application is as follows: the adjustment mechanism includes a fixed plate and a second electric push rod, a fixed plate is fixedly installed on the right side of the lifting plate, a second electric push rod is fixedly installed on the right side of the fixed plate, and the left end of the output shaft of the second electric push rod is fixedly connected to the right side of the adjustment box.

[0013] By adopting the above technical solution and by setting an adjustment mechanism, the second electric push rod can push the adjustment box to move horizontally, thereby driving the roller to adjust left and right, so that the woven fabric can return to the correct winding path, thus avoiding problems such as irregular winding and wrinkles caused by the deviation of the woven fabric.

[0014] A further feature of this application is that the clamping mechanism includes a roller frame and a roller, with the roller frame fixedly installed at the bottom of the slide column and the roller rotatably installed on the roller frame.

[0015] By adopting the above technical solution and by setting up a pressing mechanism, the roller can press the woven fabric on the take-up drum downwards, thereby ensuring the tightness and flatness of the take-up.

[0016] A further configuration of this application is as follows: the reciprocating mechanism includes a reciprocating lead screw and a lead screw seat. The same reciprocating lead screw is rotatably installed on the left inner wall of the functional box and the left side of the support plate. The reciprocating lead screw is located below the motor. A lead screw seat is threaded onto the reciprocating lead screw. The lead screw seat is located inside the mounting frame. An electrostatic ion bar is provided on the top of the lead screw seat. A transmission mechanism is provided between the reciprocating lead screw and the motor output shaft.

[0017] By adopting the above technical solution and setting up a reciprocating mechanism, the reciprocating screw can drive the electrostatic ion bar to move back and forth, thereby achieving the goal of fully eliminating static electricity generated during the winding process of the woven fabric, ensuring product quality and safe and stable winding operation.

[0018] A further configuration of this application is as follows: the transmission mechanism includes two transmission wheels and a transmission belt. Transmission wheels are fixedly sleeved on both the reciprocating lead screw and the motor output shaft. The transmission wheels are located inside the function box, and the same transmission belt is sleeved on both transmission wheels.

[0019] By adopting the above technical solution and by setting up a transmission mechanism, the motor output shaft can drive the reciprocating lead screw to rotate synchronously.

[0020] The beneficial effects of this application are:

[0021] 1. Through the cooperation of the motor, rotating roller and take-up drum, the take-up drum can be driven to rotate, so as to achieve the purpose of taking up the woven fabric. Through the cooperation of the motor, transmission wheel, transmission belt, reciprocating screw, screw seat and electrostatic ion bar, the motor can drive the electrostatic ion bar to move back and forth, so as to effectively eliminate the static electricity generated during the winding of the woven fabric, so as to ensure product quality and safe and stable winding work.

[0022] 2. By cooperating with the pressure sensor, controller and first electric push rod, the pressure sensor can monitor the pressure of the roller on the woven fabric in real time, and the controller can adjust the first electric push rod to adjust the height of the adjustment box and the roller. This ensures that the pressing force of the roller and take-up drum on the woven fabric is always within a suitable range under different take-up thicknesses, thus ensuring the tightness and flatness of the take-up.

[0023] 3. Through the cooperation of photoelectric sensors, controllers and second electric push rods, the photoelectric sensors can monitor the left and right position of the woven fabric, and the controllers can adjust the second electric push rods to drive the rollers to adjust left and right, so that the woven fabric can return to the correct winding path and avoid problems such as irregular winding and wrinkles caused by the offset of the woven fabric. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a three-dimensional structural diagram of the weaving and winding device of this application;

[0026] Figure 2 This is a schematic diagram of the internal structure of the mounting frame of the braiding and winding device of this application;

[0027] Figure 3 This is a schematic diagram of the winding mechanism, reciprocating mechanism and transmission mechanism of the braiding winding device of this application;

[0028] Figure 4 This is an exploded view of the winding mechanism of the braiding winding device of this application and a schematic diagram showing the partial cross-sectional results of the winding drum.

[0029] In the diagram: 1. Mounting frame; 101. First electric push rod; 102. Lifting plate; 2. Function box; 201. Motor; 202. Rotary roller; 203. Rewinding drum; 204. Nut; 205. Rod groove; 206. Insert rod; 3. Adjustment box; 301. Slide plate; 302. Slide column; 303. Spring; 304. Pressure sensor; 4. Support plate; 401. Reciprocating lead screw; 402. Lead screw seat; 403. Electrostatic ion bar; 5. Fixing plate; 501. Second electric push rod; 6. Roller frame; 601. Roller; 7. Photoelectric sensor; 8. Transmission wheel; 801. Transmission belt. Detailed Implementation

[0030] The technical solution of this application will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0031] See Figures 1-4 This application provides a braiding winding device, including a mounting frame 1. A function box 2 is fixedly mounted on the left side of the mounting frame 1. A motor 201 is fixedly mounted on the inner wall of the left side of the function box 2. The output shaft of the motor 201 extends into the mounting frame 1, and a winding mechanism is provided on the output shaft of the motor 201. An adjustment box 3 is provided inside the mounting frame 1, and a tensioning mechanism is provided inside the adjustment box 3. A first electric push rod 101 is fixedly mounted on the top of the mounting frame 1. The bottom end of the output shaft of the first electric push rod 101 extends into the mounting frame 1, and the first electric push rod 101 outputs... A lifting plate 102 is fixedly installed at the bottom of the shaft. The left side of the lifting plate 102 is slidably connected to the inner wall of the left side of the mounting frame 1. An adjustment mechanism is provided on the right side of the lifting plate 102. The bottom of the lifting plate 102 is slidably connected to the top of the adjustment box 3. A pressing mechanism is provided below the adjustment box 3. A support plate 4 is fixedly installed on the inner wall of the bottom of the mounting frame 1. A reciprocating mechanism is provided between the support plate 4 and the function box 2. A controller is provided on the front side of the function box 2. A photoelectric sensor 7 is provided on the inner wall of the rear side of the mounting frame 1. The photoelectric sensor 7 is electrically connected to the controller.

[0032] Specifically, the winding mechanism includes a rotating roller 202 and a winding drum 203. The rotating roller 202 is fixedly sleeved on the output shaft of the motor 201, and the winding drum 203 is sleeved on the rotating roller 202. A limit mechanism is provided between the winding drum 203 and the rotating roller 202.

[0033] Specifically, the limiting mechanism includes a rod groove 205 and an insert rod 206. The rod groove 205 is opened on the right side of the roller 202, and the insert rod 206 is fixedly installed on the inner wall of the right side of the take-up drum 203. The insert rod 206 is engaged with the rod groove 205. The output shaft of the motor 201 is provided with an external thread, and a nut 204 is installed on the external thread. The nut 204 is compatible with the take-up drum 203.

[0034] Specifically, the tensioning mechanism includes a slide plate 301, a sliding column 302, and a spring 303. The slide plate 301 is slidably installed inside the adjustment box 3. The sliding column 302 is fixedly installed at the bottom of the slide plate 301, and the bottom end of the sliding column 302 extends into the adjustment box 3. The spring 303 is fixedly installed at the top of the slide plate 301. A pressure sensor 304 is provided on the inner wall of the top of the adjustment box 3. The pressure sensor 304 is electrically connected to the controller, and the spring 303 is adapted to the pressure sensor 304.

[0035] Specifically, the adjustment mechanism includes a fixed plate 5 and a second electric push rod 501. The fixed plate 5 is fixedly installed on the right side of the lifting plate 102, and the second electric push rod 501 is fixedly installed on the right side of the fixed plate 5. The left end of the output shaft of the second electric push rod 501 is fixedly connected to the right side of the adjustment box 3.

[0036] Specifically, the clamping mechanism includes a roller frame 6 and a roller 601. The roller frame 6 is fixedly installed at the bottom of the slide column 302, and the roller 601 is rotatably installed on the roller frame 6.

[0037] Specifically, the reciprocating mechanism includes a reciprocating lead screw 401 and a lead screw seat 402. The same reciprocating lead screw 401 is rotatably mounted on the left inner wall of the function box 2 and the left side of the support plate 4. The reciprocating lead screw 401 is located below the motor 201. The lead screw seat 402 is threaded onto the reciprocating lead screw 401. The lead screw seat 402 is located inside the mounting bracket 1. An electrostatic ion bar 403 is provided on the top of the lead screw seat 402. A transmission mechanism is provided between the reciprocating lead screw 401 and the output shaft of the motor 201.

[0038] Specifically, the transmission mechanism includes two transmission wheels 8 and a transmission belt 801. The transmission wheels 8 are fixedly sleeved on both the reciprocating screw 401 and the output shaft of the motor 201. The transmission wheels 8 are located inside the function box 2, and the same transmission belt 801 is sleeved on both transmission wheels 8.

[0039] In this application, when the knitting and winding device is working, the motor 201 is first started. Its output shaft drives the rotating roller 202 to rotate synchronously with stable rotational power. The rotating roller 202 then drives the winding drum 203 sleeved on it to rotate, which can realize the purpose of winding the knitted fabric through the winding drum 203. The spring 303 on the top of the slide plate 301 in the regulating box 3 works in conjunction with the pressure sensor 304 on the inner wall of the top of the regulating box 3 to monitor the pressure of the roller 601 on the knitted fabric on the roller frame 6 at the bottom of the slide column 302 in real time. As the knitted fabric is continuously wound and the thickness gradually increases, the pressure on the roller 601 changes. When the spring 303 deforms, the pressure sensor 304 converts the pressure signal into an electrical signal and transmits it to the controller. The controller accurately calculates the current winding thickness of the woven fabric based on the preset pressure-thickness correspondence, and then sends a command to the first electric push rod 101. The first electric push rod 101 adjusts the extension and retraction of the output shaft according to the command, which can drive the lifting plate 102 to move up and down, thereby adjusting the height of the adjusting box 3 and the roller 601. This ensures that the pressing force of the roller 601 and the winding drum 203 on the woven fabric is always within a suitable range under different winding thicknesses, thus ensuring the winding tightness and flatness.

[0040] Meanwhile, the photoelectric sensor 7 on the inner wall of the rear side of the mounting frame 1 continuously monitors the position of the wound fabric. Once the fabric deviates during the winding process, the photoelectric sensor 7 detects the signal change and immediately converts it into an electrical signal, which is then transmitted to the controller. The controller quickly analyzes the direction and degree of deviation and issues a control command to the second electric push rod 501. The output shaft of the second electric push rod 501 extends and retracts, which can push the adjustment box 3 to move horizontally, thereby driving the roller 601 to adjust left and right. This allows the fabric to return to the correct winding path, thus avoiding problems such as irregular winding and wrinkles caused by fabric deviation.

[0041] At the same time, the output shaft of the motor 201 can drive the reciprocating screw 401 to rotate through two transmission wheels 8 and transmission belt 801; it can drive the screw seat 402 to move back and forth in the mounting frame 1, and the electrostatic ion bar 403 on the top of the screw seat 402 moves synchronously, which can fully eliminate the static electricity generated during the winding process of the woven fabric through the electrostatic ion bar 403, so as to ensure product quality and safe and stable winding work.

[0042] When the winding is completed and the winding drum 203 needs to be disassembled, first unscrew the nut 204 to release the axial limit on the winding drum 203; then, by controlling the first electric push rod 101 and the second electric push rod 501, adjust the position of the lifting plate 102 and the adjusting box 3, so that the positional relationship between the winding drum 203 and other components changes, creating space conditions for disassembly; at this time, due to the snap-fit ​​structure between the insert rod 206 and the rod groove 205, when the winding drum 203 is subjected to a certain axial tension, the insert rod 206 can slide relative to the rod groove 205, so that the winding drum 203 can be smoothly pulled out along the axial direction of the roller 202, realizing the convenient disassembly of the winding drum 203; it can facilitate the disassembly of the wound woven fabric, thereby improving the operational convenience and working efficiency of the entire weaving winding device.

[0043] In some embodiments, during the winding process of the woven fabric, the pressure sensor 304 in the tensioning mechanism monitors the deformation of the spring 303 in real time: if the winding thickness increases, causing the pressure of the roller 601 on the woven fabric to increase, the spring 303 is compressed, and the pressure sensor 304 transmits an electrical signal to the controller. The controller calculates the pressure deviation value through a preset algorithm and then sends a command to the first electric push rod 101 to extend its output shaft, causing the lifting plate 102 to rise, and the adjusting box 3 to move upward synchronously. The distance between the roller 601 and the winding drum 203 increases, thereby reducing the clamping force; conversely, if the pressure decreases, the first electric push rod 101 contracts, the lifting plate 102 descends, and the roller 601 presses down to maintain a constant tension force, thereby solving the wrinkle problem caused by uneven tension in the prior art.

[0044] The photoelectric sensor 7 on the inner rear wall of the mounting bracket 1 adopts a through-beam detection principle, with its transmitter and receiver respectively positioned on both sides of the woven fabric. When the woven fabric shifts, the position blocking the photoelectric signal changes, and the sensor 7 converts the shift into an electrical signal, which is then transmitted to the controller. The controller controls the extension and retraction of the output shaft of the second electric push rod 501 based on the direction of the shift (left or right) and the distance (e.g., exceeding a 5mm threshold). If the woven fabric shifts to the right, the second electric push rod 501 extends, pushing the adjusting box 3 to the left, and the roller 601 presses the woven fabric to the left. If it shifts to the left, the push rod retracts, and the adjusting box 3 moves to the right, ensuring that the woven fabric remains on the winding centerline, effectively solving the problem of irregular winding caused by shifting in the prior art.

[0045] The electrostatic ion bar 403 in the reciprocating mechanism is electrically connected to the power module inside the function box 2 via wires, and its start and stop can be controlled by the controller. When the motor 201 is running, the controller simultaneously turns on the electrostatic ion bar 403, and its internal high-voltage generator produces positive and negative ions, which are released to the surface of the woven fabric through needle-shaped electrodes to neutralize the static charge generated by friction during the winding process. At the same time, the reciprocating screw 401 drives the electrostatic ion bar 403 to move back and forth at a speed of 0.5 m / s (the reciprocating stroke covers the full width of the winding drum 203), ensuring that static electricity on the surface of the woven fabric is completely eliminated, avoiding the problems of static electricity attracting dust and safety hazards in the prior art.

[0046] In the limiting mechanism of the winding mechanism, the external thread of nut 204 and the external thread of motor 201 have a matching accuracy of 6g / 6H. After tightening, its left end face is in close contact with the right end face of winding drum 203, and the axial limiting accuracy reaches ±0.1mm. With the clearance matching between the insertion rod 206 and the rod groove 205 (clearance ≤0.05mm), it can effectively prevent the winding drum 203 from axial movement when rotating at high speed (speed range 50-200r / min), and ensure the flatness of winding.

Claims

1. A weaving and winding device, characterized in that, The system includes a mounting frame (1), a functional box (2) fixedly mounted on the left side of the mounting frame (1), a motor (201) fixedly mounted on the inner wall of the left side of the functional box (2), the output shaft of the motor (201) extending into the mounting frame (1), a winding mechanism provided on the output shaft of the motor (201), an adjustment box (3) provided inside the mounting frame (1), a tensioning mechanism provided inside the adjustment box (3), a first electric push rod (101) fixedly mounted on the top of the mounting frame (1), the bottom end of the output shaft of the first electric push rod (101) extending into the mounting frame (1), a lifting plate (102) fixedly mounted on the bottom end of the output shaft of the first electric push rod (101), the left side of the lifting plate (102) slidingly connected to the inner wall of the left side of the mounting frame (1), and an adjustment mechanism provided on the right side of the lifting plate (102). The bottom of the lifting plate (102) is slidably connected to the top of the regulating box (3). A pressing mechanism is provided below the regulating box (3). A support plate (4) is fixedly installed on the inner wall of the bottom of the mounting frame (1). A reciprocating mechanism is provided between the support plate (4) and the function box (2). A controller is provided on the front side of the function box (2). A photoelectric sensor (7) is provided on the inner wall of the rear side of the mounting frame (1). The photoelectric sensor (7) is electrically connected to the controller.

2. The weaving and winding device according to claim 1, characterized in that: The winding mechanism includes a rotating roller (202) and a winding drum (203). The rotating roller (202) is fixedly sleeved on the output shaft of the motor (201), and the winding drum (203) is sleeved on the rotating roller (202). A limit mechanism is provided between the winding drum (203) and the rotating roller (202).

3. The weaving and winding device according to claim 2, characterized in that: The limiting mechanism includes a rod groove (205) and a rod (206). The rod groove (205) is provided on the right side of the roller (202). The rod (206) is fixedly installed on the inner wall of the right side of the take-up drum (203). The rod (206) is engaged with the rod groove (205). The output shaft of the motor (201) is provided with an external thread. A nut (204) is threaded on the external thread. The nut (204) is adapted to the take-up drum (203).

4. The weaving and winding device according to claim 1, characterized in that: The tensioning mechanism includes a sliding plate (301), a sliding column (302), and a spring (303). The sliding plate (301) is slidably installed inside the adjustment box (3). The sliding column (302) is fixedly installed at the bottom of the sliding plate (301). The bottom end of the sliding column (302) extends into the adjustment box (3). The spring (303) is fixedly installed at the top of the sliding plate (301). A pressure sensor (304) is provided on the inner wall of the top of the adjustment box (3). The pressure sensor (304) is electrically connected to the controller. The spring (303) is adapted to the pressure sensor (304).

5. The weaving and winding device according to claim 1, characterized in that: The adjustment mechanism includes a fixed plate (5) and a second electric push rod (501). The fixed plate (5) is fixedly installed on the right side of the lifting plate (102), and the second electric push rod (501) is fixedly installed on the right side of the fixed plate (5). The left end of the output shaft of the second electric push rod (501) is fixedly connected to the right side of the adjustment box (3).

6. The braiding and winding device according to claim 4, characterized in that: The pressing mechanism includes a roller frame (6) and a roller (601). The roller frame (6) is fixedly installed at the bottom of the slide column (302), and the roller (601) is rotatably installed on the roller frame (6).

7. The braiding winding device according to claim 1, characterized in that: The reciprocating mechanism includes a reciprocating lead screw (401) and a lead screw seat (402). The same reciprocating lead screw (401) is rotatably installed on the left inner wall of the functional box (2) and the left side of the support plate (4). The reciprocating lead screw (401) is located below the motor (201). The lead screw seat (402) is threaded on the reciprocating lead screw (401). The lead screw seat (402) is located inside the mounting frame (1). An electrostatic ion bar (403) is provided on the top of the lead screw seat (402). A transmission mechanism is provided between the reciprocating lead screw (401) and the output shaft of the motor (201).

8. The braiding winding device according to claim 7, characterized in that: The transmission mechanism includes two transmission wheels (8) and a transmission belt (801). The reciprocating screw (401) and the output shaft of the motor (201) are both fixedly fitted with transmission wheels (8). The transmission wheels (8) are located inside the function box (2). The two transmission wheels (8) are fitted with the same transmission belt (801).

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