A cleaning production device for temperature sensors
Patent Information
- Application Number
- CN202521771562.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-20
- Publication Date
- 2026-09-29
- Estimated Expiration
- 2035-08-20
AI Technical Summary
温度传感器芯片是温度传感器的一个重要组成部件，因此需要对每一步工艺的清洁度都有严苛要求，随着温度传感器芯片制造工艺先进程度的不断提升，对温度传感器芯片表面污染物的控制要求也不断提高，在生产加工的过程中，污染物会附着在温度传感器芯片表面，会导致后续工艺的良率下降，因此在温度传感器芯片加工后，需要使用清洗装置进行清洗，避免杂质影响温度传感器芯片良率和温度传感器芯片产品的性能
[0011]1、该温度传感器的清洗生产装置，工人在将放置有若干个传感器产品的清洗笼放置到清洗液箱或第二水箱的内部后，清洗笼上的两个圆板均与两个圆杆接触，通过驱动机构带动其中一个圆杆转动，能够使该圆杆带动清洗笼整体转动，进而使清洗笼中的若干个传感器产品不断发生位置的改变，使清洗液能够对传感器产品表面进行全面清洗，提高清洗液对传感器产品的清洗质量。
Smart Images
Figure CN224807950U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of temperature sensor manufacturing technology, and more specifically, to a cleaning production device for temperature sensors. Background Technology
[0002] A temperature sensor is a sensor that can sense temperature and convert it into a usable output signal. The temperature sensor chip is a crucial component of a temperature sensor, therefore requiring stringent cleanliness standards at every stage of the process. As the manufacturing process of temperature sensor chips becomes increasingly sophisticated, the control requirements for surface contaminants also rise. During production, contaminants can adhere to the surface of the temperature sensor chip, leading to a decrease in yield for subsequent processes. Therefore, after processing, temperature sensor chips need to be cleaned using a cleaning device to prevent impurities from affecting the yield and performance of the temperature sensor chip product.
[0003] In existing ultrasonic cleaning devices, when cleaning multiple sensor products, workers often place them in a perforated container for easy loading and unloading. The container is then placed inside the cleaning device, which uses its internal cleaning fluid for ultrasonic cleaning. However, the container and the sensors are typically stationary relative to the device, resulting in overlapping contact surfaces between adjacent sensors. These contact surfaces are obstructed during cleaning, preventing proper cleaning and leaving dirt on the sensors. This reduces the cleaning quality. Furthermore, the dirt and impurities include rosin, which has a lower density than the cleaning fluid. Rosin has high recycling value; after washing away the rosin, it floats on the surface of the cleaning fluid. Existing devices cannot separate the rosin from the cleaning fluid, hindering rosin recycling for workers. Utility Model Content
[0004] The purpose of this invention is to provide a cleaning production device for temperature sensors to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, one objective of this utility model is to provide a cleaning production device for temperature sensors, comprising a cleaning liquid tank and a cleaning cage disposed within the cleaning liquid tank. A first water tank is disposed on one side of the cleaning liquid tank, and a second water tank is disposed on the side of the first water tank away from the cleaning liquid tank. An ultrasonic generator is fixedly installed on one side of the bottom surface of both the cleaning liquid tank and the second water tank, and a side plate is fixedly disposed on the other side of the cleaning liquid tank and the second water tank. Two round rods are rotatably connected to the side plates and the ultrasonic generators near their respective ends, with the axes of the two round rods located on the same horizontal plane. A driving mechanism is provided on both the cleaning liquid tank and the second water tank, and the driving mechanism is used to drive one of the round rods to rotate. The cleaning cage comprises a hexagonal cage, the interior of which is used to place the sensor product. Two round plates are symmetrically fixedly connected to both ends of the hexagonal cage. When the hexagonal cage is located inside the cleaning liquid tank or the second water tank, the circumferential surface of the round plates is in contact with the circumferential surface of the two round rods. When the driving mechanism drives the round rods to rotate, the round rods drive the cleaning cage to rotate.
[0006] As a further improvement to this technical solution, a partition is fixedly installed inside the cleaning fluid tank near one side. The upper surface of the partition is lower than the upper surface of the cleaning fluid tank. A separation chamber is set between one side of the partition and the inner wall of the cleaning fluid tank. When the hexagonal cage is installed inside the cleaning fluid tank, the hexagonal cage is installed on the side of the partition away from the separation chamber. A drain pipe is connected to the bottom of the separation chamber.
[0007] As a further improvement to this technical solution, the driving mechanism includes two uprights respectively fixedly mounted on the side plate and the ultrasonic generator. A transmission shaft is rotatably mounted between the two uprights near the top. A motor for driving the transmission shaft is fixed on one of the uprights. A sprocket is coaxially fixedly connected to one end of both the round rod and the transmission shaft. The same chain is drivingly connected to the two sprockets.
[0008] As a further improvement to this technical solution, the cleaning cage also includes an opening on the hexagonal cage, with a cage cover hinged to one side of the opening. A buckle is fixedly provided at the end of the cage cover away from the hinge, and a locking groove is fixedly provided at the position of the opening away from the hinge between the cage cover and the hexagonal cage. When the buckle is engaged and fixed with the locking groove, the cage cover blocks the opening. Several leakage holes are provided on both the hexagonal cage and the cage cover.
[0009] As a further improvement to this technical solution, the two circular plates are rotatably connected to the same handle on the side away from each other. When the circular plates are rotated by the circular rod, one end of the handle contacts the side wall of the drive shaft.
[0010] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0011] 1. In the cleaning production device for this temperature sensor, after the worker places the cleaning cage containing several sensor products into the cleaning liquid tank or the second water tank, the two circular plates on the cleaning cage are in contact with the two circular rods. The drive mechanism drives one of the circular rods to rotate, which in turn drives the entire cleaning cage to rotate. This causes the position of the several sensor products in the cleaning cage to change continuously, allowing the cleaning liquid to thoroughly clean the surface of the sensor products and improve the cleaning quality of the sensor products.
[0012] 2. In the cleaning production device for this temperature sensor, when the rosin washed off the sensor product floats on the surface of the cleaning liquid, the cleaning liquid is continuously injected into the interior of the cleaning liquid tank, causing the level of the cleaning liquid on one side of the separation chamber to rise. When the level of the cleaning liquid is higher than the upper surface of the partition, the cleaning liquid in the upper layer will carry the rosin across the partition and flow into the interior of the separation chamber, thereby separating the rosin from most of the cleaning liquid outside the separation chamber, making it convenient for workers to recycle the rosin. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0014] Figure 2 This is a schematic diagram of the combined structure of the cleaning fluid tank and the cleaning cage of this utility model;
[0015] Figure 3 For the present utility model Figure 2 A sectional view;
[0016] Figure 4 This is one of the structural diagrams of the combined round rod and cleaning cage of this utility model;
[0017] Figure 5 This is the second schematic diagram of the structure of the round rod and the cleaning cage combined according to this utility model;
[0018] Figure 6 This is a schematic diagram of the cleaning fluid tank of this utility model;
[0019] Figure 7 This is a cross-sectional view of the cleaning fluid tank of this utility model;
[0020] Figure 8 This is one of the structural schematic diagrams of the cleaning cage of this utility model;
[0021] Figure 9 This is the second schematic diagram of the cleaning cage of this utility model.
[0022] The meanings of the labels in the diagram are as follows:
[0023] 1. Cleaning fluid tank; 11. Partition; 12. Drain pipe;
[0024] 2. First water tank;
[0025] 3. Second water tank;
[0026] 4. Cleaning cage; 41. Round plate; 42. Hexagonal cage; 43. Cage lid; 44. Handle; 45. Drain hole;
[0027] 5. Drive mechanism; 51. Frame; 52. Drive shaft; 53. Motor; 54. Sprocket; 55. Chain;
[0028] 6. Side plate; 61. Ultrasonic generator; 62. Round rod. Detailed Implementation
[0029] 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.
[0030] Example 1
[0031] Please see Figures 1-9 As shown, one of the objectives of this embodiment is to provide a cleaning production apparatus for a temperature sensor, including a cleaning liquid tank 1 and a cleaning cage 4 disposed in the cleaning liquid tank 1. The structure of the cleaning cage 4 is described in detail below, referring to... Figure 8 and Figure 9 The cleaning cage 4 includes a hexagonal cage 42, the interior of which is used to place sensor products. Two circular plates 41 are symmetrically fixed to both ends of the hexagonal cage 42, sealing both ends. The cleaning cage 4 also includes an opening in the hexagonal cage 42 through which the sensor products are placed. A cage cover 43 is hinged to one side of the opening. A buckle is fixedly provided at the end of the cage cover 43 away from the hinge. A locking groove is fixedly provided at the position of the opening away from the hinge between the cage cover 43 and the hexagonal cage 42. When the worker places the sensor products inside... After the cleaned sensor product is placed into the hexagonal cage 42 through the opening, the worker flips the cage cover 43 to cover the opening. During the flipping of the cage cover 43, the buckle and the locking groove come closer to each other. When the buckle and the locking groove are engaged and fixed, the cage cover 43 seals the opening. At this time, the sensor product is sealed inside the hexagonal cage 42. At the same time, several drainage holes 45 are opened on both the hexagonal cage 42 and the cage cover 43. The diameter of the drainage holes 45 is smaller than the size of the sensor product, so that the sensor product cannot fall out of the hexagonal cage 42 through the drainage holes 45.
[0032] A first water tank 2 is located on one side of the cleaning solution tank 1, and a second water tank 3 is located on the side of the first water tank 2 away from the cleaning solution tank 1. The cleaning solution tank 1 contains cleaning solution, while the first water tank 2 and the second water tank 3 both contain clean water. The worker places the sensor product to be cleaned into the cleaning cage 4. After the worker removes the cleaning cage 4 from the cleaning solution tank 1, some cleaning solution will remain on the surface of the cleaning cage 4 and the sensor product inside. The cleaning solution remaining on the surface of the sensor product can damage the sensor product. At this time, the worker first places the cleaning cage 4 taken out of the cleaning solution tank 1 into the first water tank 2, and uses the clean water in the first water tank 2 to perform a preliminary rinse on the cleaning cage 4 and the sensor product. Then, the worker transfers the cleaning cage 4 from the first water tank 2 to the second water tank 3, and uses the clean water in the second water tank 3 to perform a second rinse on the cleaning cage 4 and the sensor product, thereby removing the cleaning solution from the sensor product and preventing the cleaning solution from damaging the surface of the sensor product.
[0033] When several sensor products are placed in the hexagonal cage 42, they will be stacked and in contact with each other. There will be contact points between these stacked sensor products. When the cleaning cage 4 is placed in the cleaning solution tank 1, the first water tank 2, and the second water tank 3, the cleaning solution and clean water cannot fully contact the surface of the sensor products. This results in incomplete cleaning of the sensor product surface, meaning that the dirt on the surface of the sensor products cannot be completely cleaned by the cleaning solution in the cleaning solution tank 1. When the cleaning cage 4 is placed in the first water tank 2 and the second water tank 3, the clean water in the first and second water tanks cannot completely remove the cleaning solution from the sensor products. This reduces the cleaning effect on the sensor products because the first water tank 2 is only responsible for removing most of the cleaning solution, and the cleaning cage 4 does not need to be finely cleaned while in the first water tank 2. However, the cleaning solution in the cleaning solution tank 1 and the clean water in the second water tank 3 are required for fine cleaning of the sensor products. Therefore, it is necessary to improve the cleaning effect of the cleaning solution in the cleaning solution tank 1 and the clean water in the second water tank 3 on the sensors in the cleaning cage 4.
[0034] Therefore, this solution proposes to fix an ultrasonic generator 61 on one side of the bottom surface inside the cleaning fluid tank 1 and the second water tank 3. When the cleaning cage 4 is placed into the cleaning fluid tank 1 or the second water tank 3, the cleaning fluid or clean water enters the interior of the hexagonal cage 42 through the leakage hole 45. By activating the ultrasonic generator 61, the ultrasonic generator 61 emits ultrasonic waves to vibrate the cleaning fluid or clean water, so that the cleaning fluid or clean water performs ultrasonic cleaning on the sensor product, thereby cleaning most of the sensor product.
[0035] To clean the contact points between several sensor products, a side plate 6 is fixedly installed inside the cleaning liquid tank 1 and the second water tank 3 near one side. Two round rods 62 are rotatably connected to the side plate 6 and the ultrasonic generator 61 near both ends of the cleaning liquid tank 1 and the second water tank 3. The axes of the two round rods 62 are on the same horizontal plane, and the distance between the axes of the two round rods 62 is less than the diameter of the circular plate 41. A drive mechanism 5 is installed on both the cleaning liquid tank 1 and the second water tank 3 to drive one of the round rods 62 to rotate. The drive mechanism 5 includes two rods respectively fixedly installed... A support frame 51 is placed on the side plate 6 and the ultrasonic generator 61. A drive shaft 52 is rotatably installed between the two supports 51 near the top. A motor 53 for driving the drive shaft 52 is fixed on one of the supports 51. A sprocket 54 is coaxially fixed to one end of a rod 62 and the drive shaft 52. The two sprockets 54 are connected to the same chain 55. When the motor 53 starts, its output shaft drives the drive shaft 52 to rotate. The drive shaft 52 drives one of the sprockets 54 to rotate. The sprocket 54 drives the other sprocket 54 and one of the rods 62 to rotate through the chain 55.
[0036] When the cleaning cage 4 is placed inside the cleaning fluid tank 1 or the second water tank 3, the cleaning fluid in the cleaning fluid tank 1 or the clean water in the second water tank 3 enters the interior of the hexagonal cage 42 through the leakage hole 45. During the downward movement of the cleaning cage 4, the circumferential surface of the circular plate 41 contacts the circumferential surface of the two circular rods 62. The two circular rods 62 support the two circular plates 41, allowing the cleaning cage 4 to be stably placed on the two circular rods 62. When the drive mechanism 5 drives the circular rods 62 to rotate, because the weight of the cleaning cage 4 is pressed against the two circular rods 62, the side walls of the circular plate 41 and the circular rods 62 are in close contact. When the round rod 62 rotates, the friction between the round rod 62 and the round plate 41 causes the round rod 62 to drive the round plate 41 to rotate. The rotating round plate 41 drives the hexagonal cage 42 to rotate together, thereby causing the round rod 62 to drive the cleaning cage 4 to rotate. When the drive mechanism 5 drives the cleaning cage 4 to rotate, the cleaning cage 4 rotates slowly in the cleaning liquid tank 1 or the second water tank 3. The slow rotation of the cleaning cage 4 causes the sensor products inside the cleaning cage 4 to move slowly, thereby ensuring that the sensor products flipped over in the later layer of the cleaning cage 4 will not be damaged due to flipping.
[0037] During the rotation of the cleaning cage 4, the sensor products rotate inside the cleaning cage 4, causing several sensor products to move and continuously change position within the hexagonal cage 42. This constantly changes the contact surface between the sensor products, preventing cleaning dead zones caused by overlapping of the sensor products. This allows the cleaning fluid to thoroughly clean the surface of the sensor products, improving the cleaning quality and ensuring effective removal of dirt. Simultaneously, the rotation of the cleaning cage 4 agitates the cleaning fluid or water, causing it to flow within the cage 4. This ensures the cleaning fluid or water thoroughly rinses the sensor products within the cleaning cage 4, enhancing the cleaning effect. The cleaning fluid removes dirt from the sensor products, and the water rinses away the cleaning fluid, ensuring the normal operation of the sensor products.
[0038] When the cleaning cage 4 is placed into the cleaning liquid tank 1, the dirt adhering to the surface of the sensor product includes rosin, which has a density less than that of the cleaning liquid, and iron filings, which have a density greater than that of the cleaning liquid. After the cleaning liquid washes away the dirt from the surface of the sensor product, the iron filings will sink to the bottom of the cleaning liquid tank 1 through the drain hole 45, while the rosin will float on the surface of the cleaning liquid through the drain hole 45. Rosin is an essential material for welding sensor products and has recycling value. In order to separate the rosin from the cleaning liquid and facilitate the recycling of the rosin, a partition 11 is fixedly installed inside the cleaning liquid tank 1 near one side. The upper surface of the partition 11 is lower than the upper surface of the cleaning liquid tank 1, and a separation chamber is formed between one side of the partition 11 and the inner wall of the cleaning liquid tank 1. When the hexagonal cage 42 is placed inside the cleaning liquid tank 1, both the cleaning liquid and the hexagonal cage 42 are placed on the partition 11 away from the separation chamber. On one side, near the bottom of the cleaning fluid tank 1, there is an inlet pipe. A water pump is installed at the end of the inlet pipe away from the cleaning fluid tank 1. When rosin floats on the surface of the cleaning fluid, the water pump continuously pumps the cleaning fluid into the cleaning fluid tank 1 through the inlet pipe, causing the liquid level of the cleaning fluid to rise. When the liquid level of the cleaning fluid is higher than the upper surface of the partition 11, the upper layer of cleaning fluid carries the rosin and flows across the partition 11 into the separation chamber. When there is no more rosin on the side of the partition 11 away from the separation chamber, the water pump stops working. The above method separates the rosin from most of the cleaning fluid outside the separation chamber, so as to facilitate the subsequent collection of rosin. At the same time, a drain pipe 12 is connected to the bottom of the separation chamber. The rosin and a small part of the cleaning fluid inside the separation chamber will flow into the rosin collection container through the drain pipe 12, so as to facilitate the workers to recycle the rosin.
[0039] After the cleaning solution or water removes the dirt from the surface of the sensor product, the worker needs to remove the cleaning cage 4 from the cleaning solution tank 1 or the second water tank 3. To facilitate the worker's removal of the cleaning cage 4 from the cleaning solution tank 1 or the second water tank 3, a handle 44 is rotatably connected to the side of the two circular plates 41 that are far apart from each other. The circular rod 62 drives the circular plates 41 to rotate towards the drive shaft 52. When the circular plates 41 are rotated by the circular rod 62, the circular plates 41 will drive the handle 44 to rotate. At this time, the handle 44 will rotate in the same direction as the circular plates 41. One end of the rotating handle 44 will contact the side wall of the drive shaft 52, at which point the drive shaft 52 will block it. The movement of the handle 44 prevents changes in its position. Because the circular plate 41 rotates slowly, the rotation speed of the transmission shaft 52 that drives the circular rod 62 is also slow. At this time, the friction between the handle 44 and the transmission shaft 52 is small. If there is concern about the friction between the transmission shaft 52 and the handle 44, a stop bar can be fixed between the two uprights 51. This stop bar is used to specifically block the rotation of the handle 44. When the worker needs to remove the cleaning cage 4 from the cleaning liquid tank 1 or the second water tank 3, the worker holds the handle 44 and lifts the cleaning cage 4 upwards, so that the worker can easily remove the cleaning cage 4 from the cleaning liquid tank 1 or the second water tank 3.
[0040] The overall procedure of this device is as follows: The sensor product is placed into the cleaning cage 4, and then the cleaning cage 4 is placed into the cleaning liquid tank 1. The drive mechanism 5 in the cleaning liquid tank 1 drives the cleaning cage 4 to rotate slowly in the cleaning liquid tank 1, so that the cleaning liquid cleans the sensor product from all directions. During the cleaning process, cleaning liquid is added to the cleaning liquid tank 1 to guide the rosin washed off the sensor product into the separation chamber. After the sensor product is cleaned, the cleaning cage 4 is transferred to the first water tank 2. The cleaning cage 4 is simply cleaned in the first water tank 2 to remove most of the cleaning liquid from the sensor product. Then the cleaning cage 4 is transferred from the first water tank 2 to the second water tank 3. The drive mechanism 5 in the second water tank 3 drives the cleaning cage 4 to rotate, so that the clean water in the second water tank 3 cleans the sensor product in the cleaning cage 4 from all directions and washes away the cleaning liquid from the sensor product.
[0041] Meanwhile, inlet and outlet pipes are installed on the cleaning fluid tank 1, the first water tank 2, and the second water tank 3. Both the inlet and outlet pipes are connected to external water pumps. When it is necessary to replace the cleaning fluid in the cleaning fluid tank 1, the cleaning fluid in the cleaning fluid tank 1 is drained through the outlet pipe, and then the new cleaning fluid is pumped into the cleaning fluid tank 1 through the inlet pipe. When it is necessary to replace the clean water in the first water tank 2 and the second water tank 3, the clean water in the first water tank 2 and the second water tank 3 is drained through the outlet pipe, and then the new clean water is pumped into the first water tank 2 and the second water tank 3 through the inlet pipe.
[0042] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. A cleaning production apparatus for a temperature sensor, comprising a cleaning liquid tank (1) and a cleaning cage (4) disposed in the cleaning liquid tank (1), wherein a first water tank (2) is disposed on one side of the cleaning liquid tank (1), and a second water tank (3) is disposed on the side of the first water tank (2) away from the cleaning liquid tank (1), characterized in that: An ultrasonic generator (61) is fixedly installed on one side of the bottom surface inside the cleaning fluid tank (1) and the second water tank (3). A side plate (6) is fixedly installed on the other side of the inside of the cleaning fluid tank (1) and the second water tank (3). Two round rods (62) are rotatably connected to the side plate (6) and the ultrasonic generator (61) near both ends of the cleaning fluid tank (1) and the second water tank (3). The axes of the two round rods (62) are located on the same horizontal plane. A drive mechanism (5) is provided on both the cleaning fluid tank (1) and the second water tank (3). The drive mechanism (5) is used to drive one of the round rods (62) to rotate. The cleaning cage (4) includes a hexagonal cage (42). The interior of the hexagonal cage (42) is used to place the sensor product. Two round plates (41) are symmetrically fixedly connected to both ends of the hexagonal cage (42). When the hexagonal cage (42) is located inside the cleaning liquid tank (1) or the second water tank (3), the circumferential surface of the round plate (41) is in contact with the circumferential surface of the two round rods (62). When the drive mechanism (5) drives the round rods (62) to rotate, the round rods (62) drive the cleaning cage (4) to rotate.
2. The cleaning production apparatus for temperature sensors according to claim 1, characterized in that: A partition (11) is fixedly installed inside the cleaning fluid tank (1) near one side. The upper surface of the partition (11) is lower than the upper surface of the cleaning fluid tank (1). A separation chamber is set between one side of the partition (11) and the inner wall of the cleaning fluid tank (1). When the hexagonal cage (42) is installed inside the cleaning fluid tank (1), the hexagonal cage (42) is installed on the side of the partition (11) away from the separation chamber. A drain pipe (12) is connected to the bottom of the separation chamber.
3. The cleaning production apparatus for temperature sensors according to claim 1, characterized in that: The drive mechanism (5) includes two uprights (51) respectively fixed on the side plate (6) and the ultrasonic generator (61). A drive shaft (52) is rotatably arranged between the two uprights (51) near the top. A motor (53) for driving the drive shaft (52) to rotate is fixed on one of the uprights (51). A sprocket (54) is coaxially fixedly connected to one end of both the round rod (62) and the drive shaft (52). The same chain (55) is connected to the two sprockets (54).
4. The cleaning production apparatus for temperature sensors according to claim 1, characterized in that: The cleaning cage (4) also includes an opening on the hexagonal cage (42), with a cage cover (43) hinged to one side of the opening. A buckle is fixedly provided at the end of the cage cover (43) away from the hinge. A locking groove is fixedly provided at the position of the opening away from the hinge of the cage cover (43) and the hexagonal cage (42). When the buckle is engaged with the locking groove, the cage cover (43) blocks the opening. Several leakage holes (45) are provided on both the hexagonal cage (42) and the cage cover (43).
5. The cleaning production apparatus for temperature sensors according to claim 3, characterized in that: Two circular plates (41) are rotatably connected to the same handle (44) on opposite sides. When the circular plates (41) are rotated by the circular rod (62), one end of the handle (44) contacts the side wall of the drive shaft (52).