A detachable roller magnetic therapy massage apparatus

Abstract

[Problem] This invention provides a detachable magnetic roller massager for easy and quick cleaning, and helps promote blood circulation and reduce dandruff buildup. [Solution] The magnetic massager mainly includes a handle, a metal decorative shell, a bottom cover, surface rollers, and silicone sleeves; it is equipped with release buttons to allow removal of each roller assembly for cleaning or replacement. The magnetic beads on the rollers are arranged in a specific manner so that the magnetic force can be exerted without applying excessive force during use. [Effect] Therefore, this device improves cleaning convenience, helps promote blood circulation, and avoids discomfort caused by excessive force.

Description

This utility model relates to a massager, specifically a roller magnetic therapy massager that is easy to assemble and disassemble. Background: With the continuous improvement of people's health awareness, the market demand for muscle and fascia relaxation and daily physiotherapy is growing rapidly. Roller magnetic therapy massagers combine the dual effects of physical rolling fascia relaxation and magnetic therapy. They can generate a magnetic field through the magnetic material on the roller, driving the movement of iron elements in the blood, improving local blood circulation efficiency, and promoting the excretion of metabolic waste. Combined with physical rolling, this achieves a synergistic effect of fascia relaxation and improved circulation. Furthermore, they are easy to operate, highly portable, and can be operated independently. Therefore, they are widely used in scenarios such as muscle relaxation after exercise, relieving stiffness caused by prolonged sitting or standing, and facial and body meridian therapy. Users cover multiple groups, including athletes, office workers who sit for long periods, and those seeking daily physiotherapy and care, and the market application scale continues to expand. Currently, the core structure of roller magnetic therapy massagers on the market mainly includes a handle body and a magnetic bead roller installed at the front of the handle. During use, the roller is driven to roll by holding the handle, thus achieving the massage and therapy function. However, existing roller magnetic therapy massagers are generally one-piece structures, and the rollers are fixed inside the handle during manufacturing and cannot be disassembled. This one-piece structure has the following core drawbacks: First, users cannot quickly change to different specifications and types of rollers according to their differentiated needs, such as fine facial massage, deep fascia relaxation, and precise acupoint pressure, greatly limiting the product's adaptability and applicable scenarios. On the other hand, after long-term use, the rollers are prone to wear and tear, demagnetization of the magnetic beads, and rotational jamming. If the rollers cannot be disassembled, the entire product must be scrapped, resulting in serious resource waste and significantly increasing the user's operating costs. Second, the product is extremely difficult to clean and maintain, posing significant hygiene and safety hazards. There are gaps between the rollers and the handle shell, and sweat, skin care products, body lotion, dust, and other contaminants can easily accumulate inside these gaps during use. The one-piece, non-disassembly structure prevents users from thoroughly cleaning and disinfecting the internal hard-to-reach areas, making it easy for bacteria and mold to grow over time. Especially for massage devices used for facial care, which come into direct contact with the delicate skin, residual dirt and microorganisms can easily cause skin allergies, inflammation, and other problems, posing serious hygiene and safety hazards. In summary, existing roller magnetic therapy massage devices, due to their integrated structural defects, have significant shortcomings in terms of scene adaptability and cleaning and maintenance feasibility, failing to meet the increasing demands of the market and users for roller magnetic therapy massage devices. Therefore, how to overcome the above-mentioned defects has become an important issue that urgently needs to be addressed by those skilled in the art. The present invention overcomes the shortcomings of the above-mentioned technology by providing a roller magnetic therapy massage device that is easy to assemble and disassemble.To achieve the above objectives, the present invention adopts the following technical solution: A roller magnetic massager that is easy to assemble and disassemble, the massager body (1) has a handle (2) connected to the top of the massager body (1) and includes the massager body (1), wherein the bottom of the massager body (1) is detachably connected to a bottom cover (4) via a quick-release assembly (3), a receiving cavity (5) is formed between the massager body (1) and the bottom cover (4), and a magnetic bead roller (6) is placed in the receiving cavity (5), and the bottom of the bottom cover (4) has an opening (41) for exposing the magnetic bead roller (6) so that the magnetic bead roller (6) can contact the human body, and the quick-release assembly (3) includes unlocking buttons (31) exposed on the left and right sides of the massager body (1), and the unlocking buttons (31) are used by the user to press to unlock the quick-release assembly (3) so as to separate the massager body (1) and the bottom cover. Preferably, the quick-release assembly (3) includes movable blocks (32) disposed on the left and right sides inside the massager body (1), the unlock button (31) protruding on the outer side of the corresponding movable block (32), the massager body (1) is also provided with a slide rail (33) extending left and right for the movable blocks (32) to be fitted on it and move left and right, the movable block (32) is provided with a downwardly extending extension (34), the outer side of the extension (34) is provided with a buckle (35), the inner wall of the bottom cover (4) is recessed with a slot (36) corresponding to the buckle (35), the buckle (35) is used to extend into the slot (36) as the movable block (32) moves outward so as to prevent the bottom cover (4) from detaching from the massager body (1), the quick-release assembly (3) also includes a return spring (37) abutting between the two movable blocks (32), the return spring (37) is used to drive the two movable blocks (32) to move outward and reset. Alternatively, the quick-release assembly (3) may include two movable pieces (38) that extend upward from the left and right sides of the bottom cover (4) and are inserted into the massager body (1). The unlocking button (31) is protruding on the outer side of the corresponding movable piece (38). The massager body (1) has locking holes (39) on both the left and right sides for the corresponding unlocking button (31) to be inserted into in order to prevent the bottom cover (4) from detaching from the massager body (1). Preferably, the magnetic bead roller (6) includes a roller (61), the surface of which is inlaid with a number of magnetic beads (62), and the surface of which is also covered with a silicone sleeve (63). A rotating shaft (64) is inserted through the center of the roller (61). Rotating shaft grooves (51) are recessed on the left and right sides of the receiving cavity (5) at the junction of the massager body (1) and the bottom cover (4). The rotating shaft grooves (51) are used to limit the rotation of the corresponding end of the rotating shaft (64) within them. Preferably, there are two magnetic bead rollers (6), which are arranged parallel to each other in the receiving cavity (5).Preferably, the magnetic beads (62) are evenly distributed in an array along the axial and circumferential directions of the roller (61) on the surface of the roller (61), and the polarity of adjacent magnetic beads (62) is opposite. Compared with the prior art, the beneficial effects of this utility model are: The massager of this case realizes the quick disassembly and assembly of the massager body (1) and the bottom cover (4) by setting the quick disassembly component (3), which can completely solve the core defect of the integrated roller magnetic therapy massager that cannot disassemble the roller. Users of this massager can quickly replace the magnetic bead rollers (6) of different specifications and types according to different usage needs, which can greatly expand the applicable scenarios and applicability of this product. Meanwhile, the detachable structure allows users to disassemble the massager and thoroughly clean the internal hard-to-reach areas, preventing the growth of bacteria from sweat and skincare product residue, thus eliminating hygiene and safety hazards. Furthermore, when the magnetic ball roller (6) experiences wear, demagnetization, or jamming, the magnetic ball roller (6) can be replaced individually without scrapping the entire massager, significantly reducing user costs and minimizing resource waste. Figure 1 is one schematic diagram of the massager in this case. Figure 2 is another schematic diagram of the massager in this case. Figure 3 is one cross-sectional schematic diagram of the massager in this case. Figure 4 is another cross-sectional schematic diagram of the massager in this case. Figure 5 is one exploded schematic diagram of the massager in this case. Figure 6 is another schematic diagram of the massager in this case, where the quick-release component is the second embodiment. Figure 7 is another exploded schematic diagram of the massager in this case, where the quick-release component is the second embodiment. The following detailed embodiments further illustrate the features of this utility model and other related features to facilitate understanding by those skilled in the art: As shown in Figures 1 to 7, a conveniently detachable roller magnetic massager includes a massager body (1) 4 3 HK 30138172 A. A handle (2) is connected to the top of the massager body (1). A bottom cover (4) is detachably connected to the bottom of the massager body (1) via a quick-release assembly (3). A receiving cavity (5) is formed between the massager body (1) and the bottom cover (4). A magnetic bead roller (6) is placed in the receiving cavity (5). An opening (41) is provided at the bottom of the bottom cover (4) to expose the magnetic bead roller (6) so that the magnetic bead roller (6) can contact the human body. The quick-release assembly (3) includes unlocking buttons (31) exposed on the left and right sides of the massager body (1). The unlocking buttons (31) are used by the user to press and unlock the quick-release assembly (3) so as to separate the massager body (1) and the bottom cover.The main structure of the massager in this case includes a massager body (1), a handle (2) for the user to hold and operate is connected to the top of the massager body (1), and a bottom cover (4) is detachably connected to the bottom of the massager body (1) through a quick-release assembly (3). After the massager body (1) and the bottom cover (4) are in place, they form a cavity (5) between them. A magnetic bead roller (6) for massage and magnetic therapy is placed in the cavity (5). At the same time, the bottom of the bottom cover (4) has an opening (41) that matches the size of the magnetic bead roller (6). The lower part of the magnetic bead roller (6) is exposed outside the bottom cover (4) through the opening (41), ensuring that the magnetic bead roller (6) can directly contact the human skin to achieve rolling massage when using the massager. The quick-release assembly (3) includes two unlocking buttons (31) exposed on the left and right outer walls of the massager body (1). Users can trigger the unlocking action of the quick-release assembly (3) by pressing the unlocking buttons (31) on both sides at the same time, thereby quickly separating the massager body (1) and the bottom cover (4), and then taking out the magnetic ball roller (6) for replacement, cleaning and other operations. As mentioned above, the massager in this case achieves quick disassembly and assembly of the massager body (1) and the bottom cover (4) by setting the quick-release assembly (3), which can completely solve the core defect of the integrated roller magnetic therapy massager that cannot disassemble the roller. Users of the massager in this case can quickly replace the magnetic ball roller (6) of different specifications and types according to different usage needs, which can greatly expand the applicable scenarios and applicability of the product in this case. Meanwhile, the detachable structure allows users to disassemble the massager and thoroughly clean the hard-to-reach areas inside, preventing the growth of bacteria from sweat and skincare product residue, thus eliminating hygiene and safety hazards. Moreover, when the magnetic ball roller (6) experiences wear, demagnetization, jamming, or other damage, the magnetic ball roller (6) can be replaced separately without scrapping the entire massager. This can significantly reduce the user's operating costs and reduce resource waste.As shown in Figures 1 to 5, this is the first embodiment of the quick-release component (3) of this case. The quick-release component (3) includes movable blocks (32) disposed on the left and right sides inside the massager body (1). The unlock button (31) is protruding on the outer side of the corresponding movable block (32). The massager body (1) is also provided with a slide rail (33) extending left and right for the movable blocks (32) to move left and right on it. The movable block (32) is provided with a downwardly extending extension (34 5 4 HK 30138172 A). The outer side of the extension (34) is provided with a buckle (35). The inner wall of the bottom cover (4) is recessed with a slot (36) corresponding to the buckle (35). The quick-release assembly (3) is designed to extend into the slot (36) as the movable block (32) moves outward to prevent the bottom cover (4) from detaching from the massager body (1). The quick-release assembly (3) also includes a return spring (37) abutting between the two movable blocks (32), which is used to drive the two movable blocks (32) to move outward and reset. A first embodiment of the quick-release assembly (3) includes an unlock button (31), movable blocks (32), a slide rail (33), an extension (34), a buckle (35), a slot (36), and a return spring (37). With the massager body (1) and bottom cover (4) assembled, pressing the unlocking buttons (31) on both sides at the same time will allow the two movable blocks (32) to overcome the elastic force of the reset spring (37) and move inward simultaneously. The movement of the movable blocks (32) will simultaneously drive the extension (34) and the buckle (35) to move inward, so that the buckle (35) will disengage from the slot (36) and no longer obstruct the separation of the massager body (1) and bottom cover (4). When assembling the massager body (D) and the bottom cover (4), simply press the unlock buttons (31) on both sides simultaneously, then align and place the massager body (1) and the bottom cover (4) in place, and then release the unlock button (31). The unlock button (31) will then move outward and reset under the force of the reset spring (37), and simultaneously move the extension part (34) and the buckle (35) outward, so that the buckle (35) is engaged in the slot (36) to prevent the massager body (1) and the bottom cover (4) from separating. At the same time, the massager body (1) is also provided with a slide rail (33) for the movable block (32) to be fitted on its upper limit and move left and right to prevent the movable block (32) from deviating during movement. As described above, the first embodiment of the quick-release component (3) in this case uses the slide rail (33) to precisely limit the movement of the movable block (32), ensuring the smoothness of the quick-release component (3)'s movement and avoiding problems such as jamming or displacement of the movable block (32). At the same time, the reset spring (37) provides a stable reset driving force to ensure that the buckle (35) can be stably inserted into the slot (36), preventing the bottom cover (4) from falling off during product use and improving the safety of product use.During disassembly, simply pressing the unlock button (31) moves the movable block (32) inward, causing the buckle (35) to disengage from the slot (36) and unlock. The unlocking operation can be completed with one hand, making disassembly and assembly convenient and efficient, which can greatly improve the user's experience when replacing the magnetic ball roller (6) and cleaning. As shown in Figures 4 and 5, preferably, the lower end face of the buckle (35) is provided with a guide slope (351). The guide slope (351) is used to guide the movable block (32) to move inward against the elastic force of the return spring (37) when it comes into contact with the edge of the bottom cover (4). As described above, the lower end face of the buckle (35) in this case is provided with a guide slope (351). The guide slope (351) extends gradually downwards towards the massager body (1) at an angle. During the process of assembling the bottom cover (4) upwards to connect with the massager body (1), the guide slope (6 5 HK 30138172 A 351) can first abut against the upper edge of the bottom cover (4). As the bottom cover (4) continues to move upwards, the guide slope (351) can convert the vertical upward thrust into a horizontal thrust that drives the movable block (32) to move inwards. This allows the movable block (32) to overcome the elastic force of the return spring (37) and move inwards, so that the buckle (35) can smoothly avoid the edge of the bottom cover (4). In this way, even if the unlock button (31) is not pressed, the bottom cover (4) can be assembled by direct insertion without pressing. In this way, the operation steps when installing the bottom cover (4) can be further simplified. As shown in Figures 6 and 7, this is the second embodiment of the quick-release component (3) of this invention. The quick-release component (3) includes two movable pieces (38) that extend upwards and are inserted into the massager body (1) on the left and right sides of the bottom cover (4). The unlocking button (31) is protruding on the outer side of the corresponding movable piece (38). The massager body (1) has locking holes (39) on both sides for the corresponding unlocking button (31) to be inserted into in order to prevent the bottom cover (4) from detaching from the massager body (1). The second embodiment of the quick-release component (3) of this invention includes an unlocking button (31), movable pieces (38), and locking holes (39). When removing the bottom cover (4), simply press the unlocking buttons (31) on both sides at the same time to make the movable pieces (38) elastically deform inwards, allowing the unlocking button (31) to disengage from the locking hole (39), and then pull the bottom cover (4) downwards to complete the unlocking. When assembling the bottom cover (4), you only need to press the movable piece (38) slightly inward and insert the movable piece (38) upward into the massager body (1). After it is inserted into place, the unlock button (31) falls into the card hole (39) through the elastic deformation of the movable piece (38). The assembly and locking of the massager body (1) and the bottom cover (4) are achieved through the cooperation of the unlock button (31) and the card hole (39).As described above, the second embodiment of the quick-release component (3) of this case adopts a cantilevered movable piece (38) structure to integrate the core structure of the quick-release component (3) onto the bottom cover (4), which can simplify the internal structure of the massager body (1) and allow the massager body (1) and bottom cover (4) to be quickly disassembled even in small-sized massagers, and the operation is equally convenient and efficient. As shown in Figures 2, 3, 4, 5 and 7, preferably, the magnetic bead roller (6) includes a roller (61), the surface of the roller (61) is inlaid with a number of magnetic beads (62), the surface of the roller (61) is also wrapped with a silicone sleeve (63), a rotating shaft (64) is provided in the center of the roller (61), and the left and right sides of the receiving cavity (5) are recessed with rotating shaft grooves (51) at the junction of the massager body (1) and the bottom cover (4), and the rotating shaft grooves (51) are used to limit the rotation of the end of the rotating shaft (64) on the corresponding side. The magnetic bead roller (6) of this case includes a roller (61), a magnetic bead (62), a silicone sleeve (63), and a rotating shaft (64). The magnetic bead (62) is embedded in the surface of the roller (61), and the surface of the roller (61) is also covered with a layer of silicone sleeve (63). The rotating shaft (64) is axially inserted at the center of the roller (61), and both ends of the rotating shaft (64) extend out of the end face of the roller (61). The left and right sides of the receiving cavity (5) are also recessed at the junction of the massager body (1) and the bottom cover (4) and are provided with a rotating shaft groove (51). The rotating shaft groove (51) is used as the shaft hole of the rotating shaft (64) for the end of the rotating shaft (64) to be installed therein, so that the magnetic bead roller (6) can roll smoothly. As described above, the magnetic bead roller (6) in this case provides a stable magnetic therapy effect through the magnetic beads (62). Combined with the soft material of the silicone sleeve (63), the magnetic bead roller (6) can take into account both the magnetic therapy effect and the comfort of massage. The roller (61) and the rotating shaft (64) are matched to ensure the strength of the roller structure and the smoothness of rotation, and reduce jamming and wear problems. As shown in Figures 1 to 7, preferably, a protective cover (7) is also provided on the lower part of the bottom cover (4). The protective cover (7) is fitted on the lower part of the bottom cover (4) by interference fit to protect the magnetic bead roller (6) when the massager is not in use. As described above, this invention also includes a protective cover (7) fitted under the bottom cover (4). The protective cover (7) is fitted under the bottom cover (4) with an interference fit. The protective cover (7) can cover the exposed magnetic ball roller (6) when the massager is not in use, thus providing comprehensive protection for the magnetic ball roller (6) and preventing it from getting dusty or dirty. It can also prevent the magnetic ball roller (6) from being bumped or deformed by external forces, thereby extending the service life of the magnetic ball roller (6). In addition, it can also prevent the magnetic ball roller (6) from coming into contact with the external environment and breeding bacteria when it is not in use, further improving the hygiene and safety of the product. Moreover, the interference fit installation method is convenient to install and remove and is not easy to fall off, resulting in a good user experience.As shown in Figures 1 to 7, preferably, the handle (2) is hinged to the massager body (1), and the hinge axis of the handle (2) is parallel to the axis of the magnetic bead roller (6). As described above, the handle (2) of this invention is hinged to the top of the massager body (1), and the hinge axis of the handle (2) is parallel to the axis of the magnetic bead roller (6). The handle (2) can rotate relative to the massager body (1) around the hinge axis. The user can freely adjust the angle between the handle (2) and the massager body (1) according to the different massage parts and massage postures, so as to adapt to different usage scenarios. By freely adjusting the grip angle of the handle (2), the user can flexibly adjust the angle of the handle (2) according to the usage needs of different massage parts, making the grip operation more comfortable and the massage force smoother. Different parts can be massaged without awkwardly adjusting the grip posture. This can further expand the applicable scenarios of this product and improve the user experience. As shown in Figures 1 to 7, preferably, the surface of the massager body (1) is also covered with a metal decorative shell (8). As described above, the massager in this case is also wrapped with a metal decorative shell (8) on the surface of the massager body (1). The metal decorative shell (8) is fastened to the outer surface of the massager body (1) by an edge-flanging structure. By wrapping with the metal decorative shell (8), the appearance and quality of the product can be greatly improved, so as to meet the aesthetic needs of different users. It can also play a certain protective role for the internal structure of the massager body (1) and extend the service life of the product. As shown in Figures 2, 3, 5 and 7, preferably, there are two magnetic bead rollers (6). The two magnetic bead rollers (6) are arranged in parallel in the front and back in the receiving cavity (5). In this way, compared with the single roller structure, a larger area of ​​massage coverage can be achieved in a single rolling operation, which effectively improves the operation efficiency of massage therapy. In addition, during the synchronous rolling of the two rollers, a more uniform and stable massage pressure can be formed, which enhances the effect of muscle relaxation and magnetic therapy. Furthermore, as a preferred embodiment, a spacing adaptive adjustment mechanism can also be provided between the two magnetic rollers (6). The spacing adaptive adjustment mechanism includes a slide groove in the receiving cavity (5) for the rotating shafts (64) of the two magnetic rollers (6) to be fixed and moved back and forth relative to each other. The position of the rotating shafts (64) is pre-tightened and positioned in the slide groove by a spring. Through the elastic pre-tightening force of the spring, the two rotating shafts (64) are continuously provided with opposite reset thrust, so that the center distance between the two magnetic rollers (6) can be within the range of 0-15 legs. It can be automatically adjusted according to the changes in the facial contours and body curves during the massage, and always maintain close contact with the human skin. At the same time, through the pre-tightening of the spring and the travel limit of the slide groove, it can be ensured that when the user applies normal massage pressure, the two magnetic rollers (6) will not separate excessively in opposite directions, and there will be no problem of skin pinching due to excessive pre-tightening force.Preferably, the magnetic beads (62) are evenly arrayed on the surface of the roller (61) along the axial and circumferential directions of the roller (61), with adjacent magnetic beads (62) having opposite polarity orientations. This allows the roller (61) to form a continuous and uniform magnetic field that covers the entire area without any blind spots during the rolling massage process, adapting to the massage rolling path and the direction of human blood vessels throughout the process. Moreover, the design of adjacent magnetic beads (62) having opposite polarity orientations can form a stable and interlaced gradient magnetic field on the surface of the roller (61), thereby more efficiently driving the movement of iron elements in the blood, significantly improving local blood circulation efficiency, and achieving a synergistic effect of magnetic therapy and fascia relaxation in conjunction with the physical rolling massage of the magnetic bead roller (6), further accelerating the excretion of metabolic waste in the blood, and fully exerting the therapeutic and conditioning effects of the product. As mentioned above, this case protects a roller magnetic therapy massager that is easy to disassemble and assemble. All technical solutions that are the same as or similar to this case should be considered to fall within the protection scope of this case. 9 8 HK 30138172 A Claim 1. A conveniently detachable roller magnetic massager, characterized in that it includes a massager body (1), a handle (2) connected to the top of the massager body (1), a bottom cover (4) detachably connected to the bottom of the massager body (1) via a quick-release assembly (3), a receiving cavity (5) is formed between the massager body (1) and the bottom cover (4), a magnetic bead roller (6) is placed in the receiving cavity (5), and an opening (41) is provided at the bottom of the bottom cover (4) for exposing the magnetic bead roller (6) so that the magnetic bead roller (6) can contact the human body, and the quick-release assembly (3) includes unlocking buttons (31) exposed on the left and right sides of the massager body (1), the unlocking buttons (31) are used for the user to press to unlock and separate the quick-release assembly (3) from the massager body (1) and the bottom cover. 2. A conveniently detachable roller magnetic massager according to claim 1, characterized in that the quick-release assembly (3) includes movable blocks (32) disposed on the left and right sides inside the massager body (1), the unlock button (31) protruding on the outer side of the corresponding movable block (32), the massager body (1) is also provided with a slide rail (33) extending left and right for the movable blocks (32) to be fitted on and move left and right, the movable block (32) is provided with a downwardly extending extension (34), the outer side of the extension (34) is provided with a buckle (35), and the inner wall of the bottom cover (4) is recessed with a groove (36) corresponding to the buckle (35). The buckle (35) is used to extend into the slot (36) as the movable block (32) moves outward so as to prevent the bottom cover (4) from detaching from the massager body (1). The quick release assembly (3) also includes a reset spring (37) abutting between the two movable blocks (32). The reset spring (37) is used to drive the two movable blocks (32) to move outward and reset.3. A roller magnetic massager that is easy to assemble and disassemble according to claim 1, characterized in that the quick-release assembly (3) includes two movable pieces (38) that extend upward and are inserted into the massager body (1) on the left and right sides of the bottom cover (4), the unlocking button (31) is protruding on the outer side of the corresponding movable piece (38), and the massager body (1) is provided with locking holes (39) on both the left and right sides for the corresponding unlocking button (31) to be inserted therein so as to prevent the bottom cover (4) from being dislodged from the massager body (1). 4. A conveniently detachable roller magnetic massager according to claim 1, characterized in that the magnetic roller (6) includes a roller (61), a plurality of magnetic beads (62) are inlaid on the surface of the roller (61), the surface of the roller (61) is also covered with a silicone sleeve (63), a rotating shaft (64) is provided through the center of the roller (61), and rotating shaft grooves (51) are recessed on the left and right sides of the receiving cavity (5) at the junction of the massager body (1) and the bottom cover (4), the rotating shaft grooves (51) are used to limit the corresponding end of the rotating shaft (64) to rotate within it. 5. A conveniently detachable roller magnetic massager according to claim 4, characterized in that the magnetic beads (62) are evenly arrayed on the surface of the roller (61) along the axial and circumferential directions of the roller (61), and the polarity orientation of adjacent magnetic beads (62) is opposite. 1 1 HK 30138172 A 2 Figure 1 10 1 HK 30138172 A 2 HK 30138172 A AA 12 3 HK 30138172 A 2 BB 8 13 4 HK 30138172 A 8 2 H5 14 5 HK 30138172 A Figure 6 15 6 HK 30138172 A 6 1 8 39 39 2 16 7 HK 30138172 A.

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