Quantitative packing scale calibration device
By designing a quantitative packaging scale calibration device, which uses a motor-driven clamping plate to hold the material and infrared signals to control the feeding, the problem of bag tipping is solved, achieving stable packaging and efficient cleaning, and ensuring the normal operation of the packaging scale.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI CHEM IND INSPECTION CO LTD
- Filing Date
- 2025-06-20
- Publication Date
- 2026-05-08
AI Technical Summary
Existing packaging scales often cause bags to tip over when materials fall into them, making packaging operations difficult.
A quantitative packaging scale calibration device was designed, including a base, a rotating column, a material tray, a clamping mechanism, and a cleaning mechanism. The device uses a motor to drive the clamping plate to hold the material and combines infrared signals to control the feeding, thereby achieving stable clamping and cleaning.
It effectively prevents material bags from tipping over, ensuring smooth packaging operations, and keeps the equipment clean through an efficient cleaning mechanism, reducing the amount of manual cleaning work.
Smart Images

Figure CN224211354U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of packaging scale technology, and in particular to a quantitative packaging scale calibration device. Background Technology
[0002] Packaging scales are automated instruments used to quickly pack and package items. They are widely used in various packaging industries. In actual use, a feeding device is required to complete the material weighing and loading of the packaging scale. In practice, packaging scales have the advantages of simple operation, stable structure and long service life.
[0003] A search revealed Chinese publication number CN218477672U, which discloses a dual-calibration feeding device for intelligent quantitative packaging scales. The device includes a storage hopper, with a mounting plate fixedly fitted to the side wall of the hopper. A vertical plate is welded to one side of the mounting plate, and a base is welded to one side of the vertical plate. The upper part of the base has an internal groove, and a partition is welded inside the internal groove. A motor is installed at the lower part of the partition, and a positioning column is installed at the output end of the motor. Four sets of placement slots are provided on the upper part of the positioning column, and two sets of first pressure sensors are installed on the bottom surface of each of the four placement slots. Beneficial effects: This invention employs an infrared receiver, an infrared transmitter, and a second pressure sensor. Through the arrangement of the infrared receiver, infrared transmitter, and second pressure sensor, a calibration structure is established, preventing misalignment between the bag on the weighing pan and the storage hopper during feeding. This ensures accurate feeding operation of the dual-calibration feeding device for intelligent quantitative packaging scales.
[0004] The patent description mentions that "when the bag on the upper part of a set of weighing pans and the storage hopper are on the same vertical line, the controller opens and closes the electric slide valve, and the material falls into the inside of the bag, which will press down on a set of weighing pans on the same side and two sets of first pressure sensors on the same side. When the two sets of first pressure sensors on the same side reach the expected load capacity, they send a signal to the controller, and the controller closes the electric slide valve." However, when the material falls into the bag, the bag is prone to tipping over, making the packaging operation difficult to carry out smoothly. In view of the above problems, a quantitative packaging scale calibration device is proposed. Utility Model Content
[0005] The present invention proposes a quantitative packaging scale calibration device, which aims to improve the problem in some existing devices that cause the bag to tip over during packaging, making packaging difficult.
[0006] To achieve the above objectives, the present invention provides the following technical solution:
[0007] A quantitative packaging scale calibration device includes a base, a rotating column rotatably connected inside the base, a material tray fixedly connected outside the rotating column, the bottom of the material tray slidably connected to the outer surface of the base, a clamping mechanism on the top of the material tray, and a cleaning mechanism on the top of the base.
[0008] The clamping mechanism includes a clamping seat, the bottom of which is fixedly connected to the top of the material tray. A fixed ring seat is fixedly connected to the outside of the rotating column. A motor is fixedly connected inside the fixed ring seat. A disk is fixedly connected to the drive end of the motor. A connecting rod is rotatably connected to the outside of the disk. A clamping plate is rotatably connected to the other end of the connecting rod. A guide assembly is fixedly connected to the top of the clamping seat.
[0009] The above scheme involves: a rotating column rotatably connected inside the base, a material tray fixed outside the rotating column with its bottom sliding on the outer surface of the base, facilitating the rotation and adjustment of the material tray's position; a clamping mechanism on top of the material tray, with one drive end of a motor connected to a disc, a connecting rod rotatably connected to the outside of the disc, and a clamping plate rotatably connected to the other end of the connecting rod; and a guide component on top of the clamping base, enabling stable clamping of materials and facilitating calibration operations; and a cleaning mechanism on top of the base for cleaning and maintenance of the device, keeping it clean and in good operating condition.
[0010] As a further description of the above technical solution:
[0011] The cleaning mechanism includes a water tank, the bottom of which is fixedly connected to the top of the base. A delivery pipe is fixedly connected to the outside of the water tank, and a water pump is provided outside the delivery pipe. The bottom of the water pump is fixedly connected to the top of the base, and a spraying assembly is fixedly connected to the top of the base.
[0012] Through the above solution: the cleaning mechanism provides efficient cleaning assurance for the quantitative packaging scale calibration device; the water storage tank provides water reserves for cleaning operations; the water storage tank is connected to a delivery pipe, and with the water pump fixed on the top of the base, the water in the storage tank can be efficiently delivered through the delivery pipe to achieve directional water flow; the spray component fixed on the top of the base can spray out the delivered water to thoroughly rinse and clean the device, promptly remove residual materials and other impurities during the use of the device, effectively maintain the cleanliness of the device, and reduce the impact of dirt accumulation on calibration accuracy.
[0013] As a further description of the above technical solution:
[0014] The guide assembly includes a fixing plate, the bottom of which is fixedly connected to the top of the clamping seat, a guide rod is fixedly connected inside the fixing plate, and the inside of the clamping plate is slidably connected to the outside of the guide rod.
[0015] Through the above solution: the guide assembly optimizes the performance of the clamping mechanism, the fixing plate stabilizes the installation of the entire guide assembly, and the guide rod provides a precise guide track for the movement of the clamping plate, enabling the clamping plate to slide smoothly along the outside of the guide rod inside, effectively avoiding shaking or deviation of the clamping plate during the clamping process, ensuring that the clamping plate can accurately and stably perform clamping and releasing operations on the material under the drive of the motor, and improving the clamping accuracy and reliability of the clamping mechanism.
[0016] As a further description of the above technical solution:
[0017] The spraying assembly includes a spraying pipe, the bottom of which is fixedly connected to the top of the base, a nozzle is fixedly connected to the outside of the spraying pipe, and one end of the delivery pipe is fixedly connected to the inside of the spraying pipe.
[0018] Through the above solution: the spray assembly enables the cleaning mechanism to achieve its cleaning function efficiently. The bottom of the spray pipe is fixed to the top of the base, providing stable support and ensuring the stability of the spraying process. The nozzle can spray out the water transmitted from the delivery pipe to clean the quantitative packaging scale calibration device. One end of the delivery pipe is fixedly connected to the inside of the spray pipe to ensure that the water flow is smoothly delivered to the nozzle, forming a continuous cleaning water path. This can quickly and thoroughly rinse the dirt on the surface and in the crevices of the device, greatly improving cleaning efficiency and cleaning effect.
[0019] As a further description of the above technical solution:
[0020] A hopper is fixedly connected to the upper part of the base, and an electric slide valve is provided at the bottom of the hopper.
[0021] The above scheme, with the hopper located at the top of the base and the electric slide gate valve at the bottom working together, brings practical convenience to the quantitative packaging scale calibration device. The hopper can store the material to be calibrated, serving as a temporary storage and transfer mechanism. The electric slide gate valve is used to open and close the scale.
[0022] As a further description of the above technical solution:
[0023] An infrared generator is fixedly connected to the bottom of the electric slide gate valve, and an infrared receiver is fixedly connected to the top of the clamping seat.
[0024] Through the above scheme: the infrared generator can emit infrared signals. When the bottom of the hopper is aligned with the clamping seat, the infrared signal is emitted to the infrared receiver. The receiver can control motor one, thereby controlling the movement of the clamping seat.
[0025] As a further description of the above technical solution:
[0026] The base is fixedly connected to a fixed seat on the outside, and a second motor is fixedly connected to the inside of the fixed seat. A drive wheel is fixedly connected to the drive end of the second motor.
[0027] With the above solution: the fixed base provides a stable mounting support for the second motor, the second motor is fixed inside the fixed base, can operate stably and output power, and the drive wheel connected to the drive end of the second motor can rotate under the drive of the second motor.
[0028] As a further description of the above technical solution:
[0029] A driven wheel is fixedly connected to the outer bottom of the rotating column. The driven wheel is fixedly connected to the inside of the base. A belt is coupled to the outside of the driving wheel and the driven wheel.
[0030] The above scheme involves the drive wheel being driven by motor two, and the drive wheel and driven wheel being coupled together by a belt. This allows the power of motor two to be transmitted stably and efficiently to the rotating column, driving the material tray to rotate smoothly. This enables the clamping seat to switch orderly between different workstations, ensuring the continuity of the packaging work.
[0031] This utility model has the following beneficial effects:
[0032] 1. In this utility model, a motor drives a disc to rotate, and the disc converts the rotational motion into linear motion via a connecting rod. This causes the clamping plate to slide along the clamping seat under the guidance of a guide rod, thereby clamping the bag. The guide rod ensures that the movement of the clamping plate is precise and stable, and it can fit tightly against the surface of the bag, preventing the bag from tipping over during the filling process and ensuring the smooth progress of quantitative packaging operations.
[0033] 2. In this utility model, the water pump is started to draw out the cleaning water from the water storage tank, pressurize and transport it to the spray pipe through the delivery pipe, and finally spray it out from the nozzle. The cleaning water can evenly cover all parts of the device, quickly remove residual materials, thereby cleaning the device, keeping the device clean, reducing the amount of manual cleaning work, and ensuring the efficient and hygienic operation of the quantitative packaging scale calibration device. Attached Figure Description
[0034] Figure 1 This is a three-dimensional schematic diagram of a quantitative packaging scale calibration device proposed in this utility model;
[0035] Figure 2 This is a schematic diagram of the structure of an electric slide gate valve for a quantitative packaging scale calibration device proposed in this utility model;
[0036] Figure 3 This is a schematic diagram of the clamping plate of a quantitative packaging scale calibration device proposed in this utility model;
[0037] Figure 4This is a schematic diagram of the driven wheel of a quantitative packaging scale calibration device proposed in this utility model.
[0038] Legend:
[0039] 1. Base; 2. Rotating column; 3. Material tray; 4. Clamping mechanism; 401. Clamping seat; 402. Fixed ring seat; 403. Motor 1; 404. Disc; 405. Connecting rod; 406. Clamping plate; 407. Guide assembly; 40701. Fixed plate; 40702. Guide rod; 5. Cleaning mechanism; 501. Water tank; 502. Conveying pipe; 503. Water pump; 504. Spray assembly; 50401. Spray pipe; 50402. Nozzle; 6. Hopper; 7. Electric slide gate valve; 8. Infrared generator; 9. Infrared receiver; 10. Driven wheel; 11. Fixed seat; 12. Motor 2; 13. Drive wheel; 14. Belt. Detailed Implementation
[0040] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0041] Reference Figures 1 to 3 This utility model provides an embodiment of a quantitative packaging scale calibration device, including a base 1, which is the basic support structure of the entire quantitative packaging scale calibration device. A rotating column 2 is rotatably connected inside the base 1. The rotating column 2 is a key transmission component of the device, which carries and drives the material tray 3 to move. The material tray 3 is fixedly connected to the outside of the rotating column 2. The material tray 3 can slide smoothly along the surface of the base 1 under the drive of the rotating column 2. The bottom of the material tray 3 is slidably connected to the outer surface of the base 1. A clamping mechanism 4 is provided on the top of the material tray 3. The clamping mechanism 4 is used to clamp and fix the bag during the receiving process to prevent the bag from tipping over during the filling process. A cleaning mechanism 5 is provided on the top of the base 1. The cleaning mechanism 5 is used to facilitate the cleaning of the device and play a role in rapid cleaning.
[0042] Specifically, the base 1 serves as the basic support, and the rotating column 2 rotates inside the base 1, causing the externally fixed material tray 3 to slide smoothly along the surface of the base 1. When the material tray 3 slides to the designated position, the clamping mechanism 4 at the top clamps and fixes the bag. At this time, the material tray 3 receives the material. After receiving the material, the material tray 3 continues to move under the drive of the rotating column 2. The cleaning mechanism 5 can clean the device to ensure the cleanliness of the device when it is used next time.
[0043] The clamping mechanism 4 includes a clamping seat 401, which provides an installation support platform for the guide assembly 407 and also provides a carrying platform for the bag. The bottom of the clamping seat 401 is fixedly connected to the top of the material tray 3. A fixed ring seat 402 is fixedly connected to the outside of the rotating column 2. The fixed ring seat 402 provides a stable installation position for the motor 403, ensuring that the motor 403 will not shake during operation. The motor 403 is fixedly connected inside the fixed ring seat 402. The motor 403 provides power to the clamping mechanism 4. The drive end of the motor 403 is connected to the disc 404, which can drive the disc 404 to rotate. The drive end of the motor 403 is fixedly connected to... A disc 404 is connected. When the disc 404 rotates under the drive of the motor 403, the disc 404 can transmit force to the clamping plate 406 through the connecting rod 405, thereby realizing the movement of the clamping plate 406. The external part of the disc 404 is rotatably connected to the connecting rod 405. The function of the connecting rod 405 is to convert the rotational motion of the disc 404 into the linear motion of the clamping plate 406. The other end of the connecting rod 405 is rotatably connected to the clamping plate 406. The clamping plate 406 is used to directly clamp the bag. The shape of the clamping plate 406 is arc-shaped, which can closely fit the surface of the container to achieve stable clamping. The top of the clamping seat 401 is fixedly connected to the guide component 407. The guide component 407 is used to provide sliding guidance for the clamping plate 406.
[0044] Specifically, when the material tray 3 moves to the receiving position, the clamping mechanism 4 starts to work. The motor 403 is fixed inside the fixed ring seat 402. The driving end of the motor 403 drives the disc 404 to rotate. When the disc 404 rotates, the rotational motion is converted into linear motion through the connecting rod 405. This causes the arc-shaped clamping plate 406 connected to the other end of the connecting rod 405 to slide along the top of the clamping seat 401 under the guidance of the guide assembly 407, thereby clamping the bag placed on the clamping seat 401.
[0045] The guide assembly 407 includes a fixing plate 40701, which provides a mounting base for the guide rod 40702, ensuring that the guide rod 40702 remains stable during operation. The bottom of the fixing plate 40701 is fixedly connected to the top of the clamping seat 401. The guide rod 40702 is fixedly connected inside the fixing plate 40701. The guide rod 40702 provides guidance for the linear movement of the clamping plate 406 and restricts the movement of the clamping plate 406 along the direction of the guide rod 40702, thereby ensuring the accuracy and stability of the movement of the clamping plate 406. The inside of the clamping plate 406 is slidably connected to the outside of the guide rod 40702.
[0046] Specifically, when clamping the bag, motor 403 drives disc 404 to rotate, and disc 404 drives clamping plate 406 to move through connecting rod 405. The inside of clamping plate 406 slides along guide rod 40702 fixed to fixed plate 40701. Under the restriction and guidance of guide rod 40702, clamping plate 406 moves in the horizontal direction, and can clamp the bag placed on clamping seat 401 with precise and stable action.
[0047] Reference Figure 1 and Figure 4 The cleaning mechanism 5 includes a water storage tank 501 for storing cleaning water. The bottom of the water storage tank 501 is fixedly connected to the top of the base 1. A delivery pipe 502 is fixedly connected to the outside of the water storage tank 501. The delivery pipe 502 is usually a flexible hose that can deliver the cleaning water in the water storage tank 501 to the spray assembly 504. A water pump 503 is provided outside the delivery pipe 502. The water pump 503 can extract the cleaning liquid in the water storage tank 501 and pressurize and deliver it to the spray assembly 504 through the delivery pipe 502. The bottom of the water pump 503 is fixedly connected to the top of the base 1. The top of the base 1 is fixedly connected to the spray assembly 504, which is a component used to clean the device.
[0048] Specifically, when the device is being cleaned, the water pump 503 located at the top of the base 1 is started to extract the cleaning water stored in the water tank 501, pressurize it, and then deliver it to the spray assembly 504 through the delivery pipe 502. Subsequently, the spray assembly 504 sprays out the cleaning water to clean the device.
[0049] The spray assembly 504 includes a spray pipe 50401, which is fixed to the top of the base 1. One end of the spray pipe 50401 is connected to the delivery pipe 502, and the other end is equipped with a nozzle 50402. The bottom of the spray pipe 50401 is fixedly connected to the top of the base 1, and the nozzle 50402 is fixedly connected to the outside of the spray pipe 50401. The nozzle 50402 can cover the area to be cleaned with cleaning water to achieve efficient cleaning. One end of the delivery pipe 502 is fixedly connected to the inside of the spray pipe 50401.
[0050] Specifically, the water pump 503 draws water from the water storage tank 501, pressurizes it, and then delivers the cleaning water through the delivery pipe 502 to the spray pipe 50401 connected to the delivery pipe 502. The water flow is transmitted along the spray pipe 50401 to the externally fixed nozzle 50402, and finally the nozzle 50402 sprays the cleaning water to cover the area of the device that needs to be cleaned.
[0051] Reference Figure 2 and Figure 4A hopper 6 is fixedly connected to the upper part of the base 1. The hopper 6 is used to hold materials and ensures that the materials fall smoothly. An electric slide gate valve 7 is provided at the bottom of the hopper 6. The electric slide gate valve 7 opens and closes the material discharge channel. An infrared generator 8 is fixedly connected to the bottom of the electric slide gate valve 7. The infrared generator 8 is a device that can emit infrared rays and emit infrared signals downwards. An infrared receiver 9 is fixedly connected to the top of the clamping seat 401. The infrared receiver 9 is used in conjunction with the infrared generator 8 and can receive the infrared signals emitted by the infrared generator 8 and transmit the received signals to the second motor 12. A fixing seat 11 is fixedly connected to the outside of the base 1. The fixing seat 11 provides a mounting base for the second motor 12. The mounting support platform has a motor 12 fixedly connected inside the fixed base 11. The motor 12 is the power source that drives the rotating column 2 to rotate. The drive end of the motor 12 is fixedly connected to the drive wheel 13. The drive wheel 13, through cooperation with the driven wheel 10, transmits the power of the motor 12 to the rotating column 2, thereby realizing the rotation of the rotating column 2. The driven wheel 10 is fixedly connected to the outer bottom of the rotating column 2. The driven wheel 10 can rotate synchronously under the drive of the drive wheel 13, thereby driving the rotating column 2 to rotate. The driven wheel 10 is fixedly connected to the inside of the base 1. The drive wheel 13 and the driven wheel 10 are coupled to the outside of the driven wheel 13 and the driven wheel 10 by a belt 14. The belt 14 is a transmission component that connects the drive wheel 13 and the driven wheel 10 and can transmit power during the transmission process.
[0052] Specifically, the material is placed in the hopper 6 above the base 1. The motor 2 12 is started, and the drive end of the motor 2 12 drives the drive wheel 13 to rotate. The drive wheel 13 drives the driven wheel 10 to rotate through the belt 14, which in turn causes the rotating column 2 to rotate. The rotating column 2 then drives the material tray 3 to move. When the infrared receiver 9 receives the infrared signal emitted by the infrared generator 8, it transmits the signal to the motor 2 12. The motor 2 12 stops rotating, aligning the bottom of the hopper 6 with the material tray 3, thus achieving calibration. At the same time, the electric slide valve 7 opens, and the material falls smoothly from the hopper 6 into the bag on the clamping seat 401 at the top of the material tray 3.
[0053] Working principle: The material is placed into the feeding hopper 6, and then the second motor 12 is started. The drive end of the second motor 12 drives the drive wheel 13 to rotate. The drive wheel 13 drives the driven wheel 10 to rotate through the belt 14. The driven wheel 10 then drives the rotating column 2 to rotate. The rotating column 2 drives the material tray 3 to move. The material tray 3 drives the clamping seat 401 to move. When the infrared receiver 9 at the top of the clamping seat 401 receives the infrared signal emitted by the infrared generator 8 at the bottom of the electric slide valve 7, it transmits the signal to the second motor 12. The second motor 12 stops rotating, so that the bottom of the feeding hopper 6 is aligned with the material tray 3. At this time, the first motor 403 drives the disc 404 to rotate. The disc 404 converts the rotational motion into linear motion through the connecting rod 405, so that the arc-shaped clamping plate 406 slides along the top of the clamping seat 401 to clamp the bag under the guidance of the guide rod 40702. Then the electric slide valve 7 opens, and the material falls from the feeding hopper 6 into the bag.
[0054] After receiving the material, the material tray 3 continues to move under the drive of the rotating column 2. The water pump 503 draws water from the water storage tank 501, pressurizes it, and then delivers it to the spray pipe 50401 through the conveying pipe 502. Finally, the nozzle 50402 sprays the cleaning water to cover the device for cleaning.
[0055] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A quantitative packaging scale calibration device, comprising a base (1), characterized in that: The base (1) is rotatably connected to a rotating column (2), and a material tray (3) is fixedly connected to the outside of the rotating column (2). The bottom of the material tray (3) is slidably connected to the outer surface of the base (1). The top of the material tray (3) is provided with a clamping mechanism (4), and the top of the base (1) is provided with a cleaning mechanism (5). The clamping mechanism (4) includes a clamping seat (401), the bottom of which is fixedly connected to the top of the material tray (3). A fixed ring seat (402) is fixedly connected to the outside of the rotating column (2). A motor (403) is fixedly connected inside the fixed ring seat (402). A disc (404) is fixedly connected to the drive end of the motor (403). A connecting rod (405) is rotatably connected to the outside of the disc (404). A clamping plate (406) is rotatably connected to the other end of the connecting rod (405). A guide assembly (407) is fixedly connected to the top of the clamping seat (401).
2. The quantitative packaging scale calibration device according to claim 1, characterized in that: The cleaning mechanism (5) includes a water storage tank (501), the bottom of which is fixedly connected to the top of the base (1), a delivery pipe (502) is fixedly connected to the outside of the water storage tank (501), a water pump (503) is provided outside the delivery pipe (502), the bottom of which is fixedly connected to the top of the base (1), and a spray assembly (504) is fixedly connected to the top of the base (1).
3. The quantitative packaging scale calibration device according to claim 1, characterized in that: The guide assembly (407) includes a fixing plate (40701), the bottom of which is fixedly connected to the top of the clamping seat (401), and a guide rod (40702) is fixedly connected inside the fixing plate (40701). The inside of the clamping plate (406) is slidably connected to the outside of the guide rod (40702).
4. The quantitative packaging scale calibration device according to claim 2, characterized in that: The spray assembly (504) includes a spray pipe (50401), the bottom of which is fixedly connected to the top of the base (1), and a nozzle (50402) is fixedly connected to the outside of the spray pipe (50401). One end of the delivery pipe (502) is fixedly connected to the inside of the spray pipe (50401).
5. A quantitative packaging scale calibration device according to claim 1, characterized in that: A hopper (6) is fixedly connected to the upper part of the base (1), and an electric slide valve (7) is provided at the bottom of the hopper (6).
6. The quantitative packaging scale calibration device according to claim 5, characterized in that: An infrared generator (8) is fixedly connected to the bottom of the electric slide gate valve (7), and an infrared receiver (9) is fixedly connected to the top of the clamping seat (401).
7. The quantitative packaging scale calibration device according to claim 1, characterized in that: The base (1) is fixedly connected to a fixed seat (11) on the outside, and a motor (12) is fixedly connected to the inside of the fixed seat (11). The drive end of the motor (12) is fixedly connected to a drive wheel (13).
8. A quantitative packaging scale calibration device according to claim 7, characterized in that: A driven wheel (10) is fixedly connected to the bottom outer side of the rotating column (2). The driven wheel (10) is fixedly connected to the outside of the base (1). A belt (14) is coupled to the outside of the driving wheel (13) and the driven wheel (10).