A copper-free toothbrush hair transplanting machine

Abstract

The present invention discloses a copper-free toothbrush hair transplanting machine, including a support cabinet, a negative pressure pump is installed at the lower end of the support cabinet, a No. 1 support workbench is installed at the upper end of the support cabinet, a No. 2 support workbench is installed at the front of the upper end of the No. 1 support workbench, five toothbrush wire conveying devices are installed at the upper end of the No. 2 support workbench, and a toothbrush wire sorting device is installed at the middle of the upper end of the No. 1 support workbench. The copper-free toothbrush hair transplanting machine described in the present invention can simultaneously insert different toothbrush wires into corresponding holes through the toothbrush wire conveying device, can be compatible with multiple products, and can produce other types of products by replacing a small number of accessories. The toothbrush head and the toothbrush handle are produced separately, reducing the increase in production costs caused by defective products. At the same time, the bristles treated by hot melt technology will be very stable when cooled down, and the bristles will not fall off easily. In addition, the hair transplanting production efficiency of the toothbrush head is improved, and one toothbrush head is produced every 4-5 seconds.

Description

Technical Field

[0001] The invention relates to the technical field of toothbrush manufacturing, in particular to a copper-free toothbrush hair transplanting machine. Background Art

[0002] With the rapid development of science and technology and medicine, people's living standards have been greatly improved, and the awareness of preventive health care has been continuously improved. People are also paying more and more attention to oral self-care. As an important daily necessity, toothbrushes also play an important role in people's lives. The most important self-care method to remove plaque on the tooth surface and keep the oral cavity clean and hygienic is brushing teeth, so the production efficiency and quality of toothbrushes are particularly important. At present, the toothbrush production equipment uses the bobbin to move back and forth in the bobbin case for wire drawing, and continuously feeds the toothbrush wire into the implanted mouth. The cam mechanism drives the aluminum sheet feeding mechanism to feed the aluminum sheet into the slicing knife box for slicing, and then implants each bundle of toothbrush wire into each hole of the toothbrush head in turn. The toothbrush wires of different colors are implanted according to the programming settings. A toothbrush can be produced in 6 seconds, which is relatively inefficient. At the same time, defective products will cause the entire toothbrush to be scrapped, increasing the production cost. The production process of toothbrushes with different toothbrush wires will be more complicated, which limits the number, length, color and shape of the hair material of a single toothbrush head, and the types of toothbrushes that can be produced are few. Therefore, we propose a copper-free toothbrush hair transplanting machine. Summary of the invention

[0003] The main purpose of the present invention is to provide a copper-free toothbrush hair transplanting machine, which can effectively solve the problems in the background technology.

[0004] To achieve the above object, the technical solution adopted by the present invention is:

[0005] A copper-free toothbrush hair transplanting machine comprises a supporting cabinet, a negative pressure pump is installed at the lower end of the supporting cabinet, a supporting workbench No. 1 is installed at the upper end of the supporting cabinet, a supporting workbench No. 2 is installed at the front of the upper end of the supporting workbench No. 1, five toothbrush wire conveying devices are installed at the upper end of the supporting workbench No. 2, a toothbrush wire sorting device is installed at the middle of the upper end of the supporting workbench No. 1, a toothbrush wire planting device is installed at the rear end of the toothbrush wire sorting device, a toothbrush welding and forming device is installed at the left part of the upper end of the supporting workbench No. 1, a mechanical arm and a feeding port are respectively installed at the rear part of the upper end of the supporting workbench No. 1, a supporting frame is installed at the right end of the supporting cabinet, a vibration disk is installed at the upper end of the supporting frame, a toothbrush sheet feeding guide rail is installed at the left end of the vibration disk, and the left end of the toothbrush sheet feeding guide rail is connected to the toothbrush wire planting device.

[0006] Preferably, the toothbrush filament conveying device includes a bobbin case, a fixed base is installed at the right end of the bobbin case, a driving motor is installed at the upper end of the fixed base, a toothbrush filament grabber is installed at the left end of the driving motor, a pen-shaped cylinder is installed at the rear end of the fixed base, a wire taking turntable is installed at the rear of the lower end of the bobbin case, a wire taking turntable is installed at the middle of the upper end of the No. 2 supporting workbench, a tube insertion seat is installed at the upper end of the No. 2 supporting workbench, a plurality of vacuum straws are installed at the upper end of the tube insertion seat, a pushing cylinder is installed at the rear end of the tube insertion seat, the pushing cylinder is installed at the rear end of the upper end of the No. 2 supporting workbench, and the bobbin case is installed at the front of the upper end of the No. 2 supporting workbench.

[0007] Preferably, the toothbrush filament implanting device includes an electric push rod, an anti-static tube mounting plate is installed in the middle of the front end of the electric push rod, a toothbrush filament integration mold plate is installed at the lower end of the anti-static tube mounting plate, a support is installed at the right end of the toothbrush filament integration mold plate, a piston air pump is installed at the upper end of the support, a carrier is respectively installed at the lower part of the front end of the electric push rod, and a shaking carrier cylinder is installed at the left and right ends of the carrier, and the electric push rod is installed at the rear end of the toothbrush filament sorting device.

[0008] Preferably, the toothbrush filament arrangement device includes a carrier toggle plate, a connecting plate is installed at the right end of the carrier toggle plate, a shaping height lifting cylinder is installed at the rear end of the connecting plate, an air pump is installed at the front end of the connecting plate, and the carrier toggle plate is installed in the middle of the upper end of the No. 1 support workbench.

[0009] Preferably, the toothbrush welding and forming device includes a fixed frame, a KK module is installed on the fixed frame, a heating core is installed in the middle of the front end of the fixed frame, a processing table is installed in the lower part of the front end of the fixed frame, and the fixed frame is installed on the left part of the upper end of the No. 1 support workbench.

[0010] Preferably, the five bobbin cases are distributed equidistantly from left to right.

[0011] Preferably, the toothbrush filament grabbing hook is located just above the bobbin case.

[0012] Preferably, the anti-static tube mounting plate is located correspondingly to the upper and lower sides of the carrier.

[0013] Preferably, the heating core corresponds to the processing table in upper and lower positions.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. A copper-free toothbrush hair transplanting machine of the present invention manually puts the toothbrush filaments into the shuttle shell on the toothbrush filament conveying device, and the pen-shaped cylinder drives the fixed base to slide, thereby driving the motor to slide accordingly, and the driving motor drives the toothbrush filament grabbing hook to convey the toothbrush filaments to the filament taking turntable, and the filament taking turntable automatically brushes the toothbrush filaments, and then the toothbrush filaments are sucked into the anti-static tube by vacuum extraction by a negative pressure pump, so that the device can simultaneously insert different toothbrush filaments into the corresponding holes, can be compatible with multiple products, and can produce other types of products by replacing a small number of accessories. The toothbrush head and the toothbrush handle are produced separately, which reduces the increase in production costs caused by defective products, and then the anti-static tube mounting plate on the toothbrush filament implanting device and The anti-static tube is connected to the toothbrush wire so that the toothbrush wire is sent into the toothbrush wire integration mold plate, and then the carrier cylinder is shaken to assist the toothbrush wire to be smoothly inserted into the toothbrush head. The carrier toggle plate on the toothbrush wire sorting device moves the toothbrush head to the processing table on the toothbrush welding and forming device, and then the KK module controls the lifting and shifting of the riveting pressure. The thermostat controls the temperature of the heating core at 900±2℃, and the shaped toothbrush wire and the toothbrush head are welded together with high-temperature sol, and the roots of the bristles are welded in the toothbrush head. The bristles treated with hot melt technology will be very stable when cooled down, and the bristles will not fall off easily. It also improves the hair planting production efficiency of the toothbrush head, and produces one toothbrush head every 4-5 seconds.

[0016] 2. At the top of the toothbrush filament planting device are two mounting plates for inserting antistatic tubes. The antistatic tubes inserted on the mounting plates have two sizes, namely, an inner diameter of φ2.5mm and an outer diameter of φ3.3mm and an inner diameter of φ3.0mm and an outer diameter of φ4.0mm. The number of inserted tubes corresponds to the toothbrush holes of the toothbrush head. The tube lengths are 0.6 meters and 1.0 meters. The tubes are fixed with the top two layers of plates, and the matching clearance with the fixed plate holes is 0.05mm. The holes of all mold plates are larger on the top and smaller on the bottom, but the holes of the two fitting surfaces are smaller on the top and slightly larger on the bottom, reducing the chance of hair blockage. The holes of the topmost fixed plate are relatively scattered, and the holes are gradually gathered to the middle at an inclination angle of 5°-8°, so that the holes on the last plate are distributed directly above the corresponding holes of the toothbrush head, and the shape of the holes gradually transitions from the circular holes on the top layer to the same shape as the holes on the toothbrush head. The slide plate of the carrier has two cavities. When the toothbrush filaments are implanted, the cavity works with a leaky mesh and a fine metal mesh to ensure ventilation without causing the toothbrush filaments to leak out during vacuuming.

[0017] 3. The number of the shuttle shells is determined by the number of types of toothbrush filaments required by the toothbrush head. A single toothbrush head can be implanted with multiple types (colors, quantities, lengths) of toothbrush filaments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is an overall structural diagram of a copper-free toothbrush hair transplanting machine of the present invention;

[0019] Figure 2 It is a structural schematic diagram of a toothbrush filament conveying device and a toothbrush filament planting device of a copper-free toothbrush hair transplanting machine of the present invention;

[0020] Figure 3 It is a structural schematic diagram of a toothbrush filament conveying device of a copper-free toothbrush hair transplanting machine of the present invention;

[0021] Figure 4 It is a structural diagram of a toothbrush filament implanting device of a copper-free toothbrush hair implanting machine of the present invention;

[0022] Figure 5 It is a structural schematic diagram of a toothbrush filament arrangement device of a copper-free toothbrush hair transplanting machine of the present invention;

[0023] Figure 6 The present invention is a schematic structural diagram of a toothbrush welding and forming device of a copper-free toothbrush hair transplanting machine.

[0024] In the figure: 1. Support cabinet; 2. Toothbrush wire conveying device; 3. Toothbrush wire planting device; 4. Toothbrush wire sorting device; 5. Toothbrush welding and forming device; 6. No. 1 support workbench; 7. Support frame; 8. Vibration plate; 9. Feeding port; 10. Robot arm; 11. Negative pressure pump; 12. No. 2 support workbench; 13. Toothbrush sheet feeding guide rail; 20. Shuttle case; 21. Fixed base; 22. Driving motor; 23. Toothbrush wire grabber; 24. Pen-shaped cylinder; 25. Wire-taking turntable; 26. Insertion seat; 27. Vacuum suction tube; 28. Push cylinder; 30. Electric push rod; 31. Anti-static tube mounting plate; 32. Toothbrush wire integration mold plate; 33. Carrier; 34. Shake carrier cylinder; 35. Piston air pump; 36. Support; 40. Carrier toggle plate; 41. Connecting plate; 42. Shaping height lifting cylinder; 43. Air pump; 50. Fixed frame; 51. KK module; 52. Processing table; 53. Heating core. DETAILED DESCRIPTION

[0025] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0026] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] like Figure 1-6 As shown, a copper-free toothbrush hair transplanting machine includes a supporting cabinet 1, a negative pressure pump 11 is installed at the lower end of the supporting cabinet 1, a supporting workbench No. 1 is installed at the upper end of the supporting cabinet 1, a supporting workbench No. 2 is installed at the front of the upper end of the supporting workbench No. 1 6, five toothbrush wire conveying devices 2 are installed at the upper end of the supporting workbench No. 2 12, a toothbrush wire sorting device 4 is installed at the middle of the upper end of the supporting workbench No. 1 6, a toothbrush wire planting device 3 is installed at the rear end of the toothbrush wire sorting device 4, a toothbrush welding and forming device 5 is installed at the left part of the upper end of the supporting workbench No. 1 6, a mechanical arm 10 and a feeding port 9 are respectively installed at the rear part of the upper end of the supporting workbench No. 1 6, a supporting frame 7 is installed at the right end of the supporting cabinet 1, a vibration plate 8 is installed at the upper end of the supporting frame 7, a toothbrush sheet feeding guide rail 13 is installed at the left end of the vibration plate 8, and the left end of the toothbrush sheet feeding guide rail 13 is connected to the toothbrush wire planting device 3.

[0029] The toothbrush wire conveying device 2 includes a bobbin case 20, a fixed base 21 is installed at the right end of the bobbin case 20, a driving motor 22 is installed at the upper end of the fixed base 21, a toothbrush wire grabber 23 is installed at the left end of the driving motor 22, a pen-shaped cylinder 24 is installed at the rear end of the fixed base 21, a wire-taking turntable 25 is installed at the rear of the lower end of the bobbin case 20, a wire-taking turntable 25 is installed at the middle of the upper end of the No. 2 support workbench 12, a tube insertion seat 26 is installed at the upper end of the No. 2 support workbench 12, and a plurality of vacuum suction pipes 27 are installed at the upper end of the tube insertion seat 26, and a push cylinder 28 is installed at the rear end of the tube insertion seat 26, and the push cylinder 28 is installed at the rear end of the upper end of the No. 2 support workbench 12. At the front upper end of the No. 2 support workbench 12, after the toothbrush filaments are manually placed into the bobbin case 20, the pen-shaped cylinder 24 drives the fixed base 21 to slide, and the fixed base 21 causes the driving motor 22 to slide accordingly. The driving motor 22 slides and drives the toothbrush filament grabber 23 to grab the toothbrush filaments and transport them to the filament taking turntable 25, and the filament taking turntable 25 automatically brushes the toothbrush filaments. At the same time, the number of bobbin cases 20 is determined by the number of toothbrush filament types required by the toothbrush head, so that a single toothbrush head can be implanted with multiple types (color, quantity, length) of toothbrush filaments, and the toothbrush filaments are sucked into the anti-static tube by vacuum extraction by the negative pressure pump 11 so that the device can be used simultaneously When inserting different toothbrush filaments into the corresponding holes, it can be compatible with multiple products. By replacing a small number of accessories, other types of products can be produced. The toothbrush head and the toothbrush handle are produced separately to reduce the increase in production costs caused by defective products; the toothbrush filament planting device 3 includes an electric push rod 30, an anti-static tube mounting plate 31 is installed in the middle of the front end of the electric push rod 30, a toothbrush filament integration mold plate 32 is installed at the lower end of the anti-static tube mounting plate 31, a support 36 is installed at the right end of the toothbrush filament integration mold plate 32, a piston air pump 35 is installed at the upper end of the support 36, a carrier 33 is installed at the lower part of the front end of the electric push rod 30, and a shaking carrier cylinder 34 is installed at the left and right ends of the carrier 33. The push rod 30 is installed at the rear end of the toothbrush wire arrangement device 4, and is connected to the antistatic tube through the antistatic tube installation plate 31, so that the toothbrush wire is sent into the toothbrush wire integration mold plate 32, and then shaken by the shaking carrier cylinder 34 to assist the toothbrush wire to be smoothly inserted into the toothbrush head. At the same time, the antistatic tube inserted on the antistatic tube installation plate 31 has two sizes, namely, an antistatic tube with an inner diameter of φ2.5mm and an outer diameter of φ3.3mm and an antistatic tube with an inner diameter of φ3.0mm and an outer diameter of φ4.0mm. The number of inserted tubes corresponds to the toothbrush holes of the toothbrush head, and the length of the tube is 0.6m and 1.0m. The tube is fixed with the top two layers of plates, and the matching clearance with the fixing plate hole is 0.05mm; the toothbrush filament finishing device 4 includes a carrier toggle plate 40, a connecting plate 41 is installed at the right end of the carrier toggle plate 40, a shaping height lifting cylinder 42 is installed at the rear end of the connecting plate 41, an air pump 43 is installed at the front end of the connecting plate 41, and the carrier toggle plate 40 is installed in the middle of the upper end of the No. 1 support workbench 6; the toothbrush welding and forming device 5 includes a fixed frame 50, a KK module 51 is installed on the fixed frame 50, a heating core 53 is installed in the middle of the front end of the fixed frame 50, a processing table 52 is installed at the lower front end of the fixed frame 50, and the fixed frame 50 is installed at the upper left end of the No. 1 support workbench 6, and the toothbrush piece head is toggled to the No. 1 support workbench 6 through the carrier toggle plate 40 On the processing table 52, the KK module 51 controls the lifting and displacement of the riveting press, and the temperature controller controls the temperature of the heating core at 900±2℃, and the shaped toothbrush filaments and the toothbrush head are welded together with high-temperature sol, so that the roots of the bristles are welded inside the toothbrush head piece. The bristles treated by hot melt technology will be very stable when cooled down, and the bristles will not fall off easily, and the hair planting production efficiency of the toothbrush head will also be improved; the five bobbin cases 20 are distributed in equal distances from left to right; the position of the toothbrush filament grabber 23 is located directly above the bobbin case 20; the position of the anti-static tube mounting plate 31 corresponds to the upper and lower positions of the carrier 33; the heating core 53 corresponds to the upper and lower positions of the processing table 52. .

[0030] It should be noted that the present invention is a copper-free toothbrush hair transplanting machine. When toothbrush production is required, the toothbrush filaments are first manually placed into the bobbin case 20 on the toothbrush filament conveying device 2, and the pen-shaped cylinder 24 drives the fixed base 21 to slide, thereby driving the motor 22 to slide accordingly, and the driving motor 22 simultaneously drives the toothbrush filament grabber 23 to convey the toothbrush filaments to the filament taking turntable 25, and the filament taking turntable 25 automatically brushes the toothbrush filaments, and the number of bobbin cases 20 is determined by the number of types of toothbrush filaments required by the toothbrush head, so that a single toothbrush head can be implanted with multiple types (color, quantity, length) of toothbrush filaments, and then the negative pressure pump 11 vacuum extracts the toothbrush filaments into the anti-static tube, so that the device can simultaneously insert different toothbrush filaments into the corresponding holes, and can be compatible with multiple products. By replacing a small number of accessories, other types of products can be produced. Separate production can reduce the increase in production costs caused by defective products. The anti-static tube mounting plate 31 on the toothbrush filament planting device 3 is connected to the anti-static tube, so that the toothbrush filament is sent into the toothbrush filament integration mold plate 32, and then shaken by the shaking carrier cylinder 34 to assist the toothbrush filament to be smoothly inserted into the toothbrush head. The carrier toggle plate 40 on the toothbrush filament sorting device 4 moves the toothbrush head to the processing table 52 on the toothbrush welding and molding device 5, and then the KK module 51 controls the lifting and shifting of the riveting pressure. The temperature controller controls the temperature of the heating core 53 at 900±2℃, and the shaped toothbrush filament and the toothbrush head are welded together with high-temperature sol, and the roots of the bristles are welded in the toothbrush head piece. The bristles treated with hot melt technology will be very stable when cooled down, and the bristles will not fall off easily. It also improves the hair planting production efficiency of the toothbrush head, and one toothbrush head is produced every 4-5 seconds.

[0031] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A copper-free toothbrush hair transplanting machine, comprising a supporting cabinet (1), characterized in that: A negative pressure pump (11) is installed at the lower end of the support cabinet (1); a No. 1 support workbench (6) is installed at the upper end of the support cabinet (1); a No. 2 support workbench (12) is installed at the front of the upper end of the No. 1 support workbench (6); five toothbrush wire conveying devices (2) are installed at the upper end of the No. 2 support workbench (12); a toothbrush wire arrangement device (4) is installed at the middle of the upper end of the No. 1 support workbench (6); and a toothbrush wire planting device (3) is installed at the rear end of the toothbrush wire arrangement device (4). ), a toothbrush welding and forming device (5) is installed at the left part of the upper end of the No. 1 support workbench (6), a mechanical arm (10) and a feed port (9) are installed at the rear part of the upper end of the No. 1 support workbench (6), a support frame (7) is installed at the right end of the support cabinet (1), a vibration plate (8) is installed at the upper end of the support frame (7), a toothbrush sheet feeding guide rail (13) is installed at the left end of the vibration plate (8), and the left end of the toothbrush sheet feeding guide rail (13) is connected to the toothbrush filament implantation device (3); Each of the toothbrush filament conveying devices (2) comprises a bobbin case (20), a fixed base (21) being mounted on the right end of the bobbin case (20), a driving motor (22) being mounted on the upper end of the fixed base (21), a toothbrush filament grabbing hook (23) being mounted on the left end of the driving motor (22), a pen-shaped cylinder (24) being mounted on the rear end of the fixed base (21), a wire-taking turntable (25) being mounted on the rear portion of the lower end of the bobbin case (20), a wire-taking turntable (25) being mounted on the middle portion of the upper end of the No. 2 supporting workbench (12), a tube insertion seat (26) being mounted on the upper end of the No. 2 supporting workbench (12), a plurality of vacuum suction tubes (27) being mounted on the upper end of the tube insertion seat (26), a pushing cylinder (28) being mounted on the rear end of the tube insertion seat (26), the pushing cylinder (28) being mounted on the rear portion of the upper end of the No. 2 supporting workbench (12), and the bobbin case (20) being mounted on the upper front portion of the No. 2 supporting workbench (12); The toothbrush filament planting device (3) comprises an electric push rod (30), an antistatic tube mounting plate (31) is mounted at the middle of the front end of the electric push rod (30), a toothbrush filament integration mold plate (32) is mounted at the lower end of the antistatic tube mounting plate (31), a support (36) is mounted at the right end of the toothbrush filament integration mold plate (32), a piston air pump (35) is mounted at the upper end of the support (36), a carrier (33) is mounted at the lower part of the front end of the electric push rod (30), a shaking carrier cylinder (34) is mounted at the left and right ends of the carrier (33), and the electric push rod (30) is mounted at the rear end of the toothbrush filament finishing device (4).

2. A copper-free toothbrush hair transplanting machine according to claim 1, characterized in that: The toothbrush filament arrangement device (4) comprises a carrier dial (40), a connecting plate (41) is installed at the right end of the carrier dial (40), a shaping height lifting cylinder (42) is installed at the rear end of the connecting plate (41), and an air pump (43) is installed at the front end of the connecting plate (41), and the carrier dial (40) is installed at the middle of the upper end of the No. 1 support workbench (6).

3. The copper-free toothbrush hair transplanting machine according to claim 1, characterized in that: The toothbrush welding and forming device (5) comprises a fixing frame (50), a KK module (51) is installed on the fixing frame (50), a heating core (53) is installed in the middle of the front end of the fixing frame (50), a processing table (52) is installed in the lower part of the front end of the fixing frame (50), and the fixing frame (50) is installed on the upper left part of the No. 1 supporting workbench (6).

4. The copper-free toothbrush hair transplanting machine according to claim 1, characterized in that: The five bobbin cases (20) are distributed in order and at equal distances from left to right.

5. The copper-free toothbrush hair transplanting machine according to claim 1, characterized in that: The toothbrush filament grabbing hook (23) is located directly above the bobbin case (20).

6. The copper-free toothbrush hair transplanting machine according to claim 1, characterized in that: The anti-static tube mounting plate (31) is located in a position corresponding to the carrier (33) in the upper and lower directions.

7. The copper-free toothbrush hair transplanting machine according to claim 3, characterized in that: The heating core (53) and the processing table (52) are located in corresponding positions up and down.

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