Fully automatic fiber optic cutter

Abstract

This utility model discloses a fully automatic fiber optic cleaver, relating to the field of fiber optic cleaver technology. It includes a base box with a hinged flip-top plate at the rear top. A through-hole penetrating the inner cavity is formed in the top of the base box. Two base pad mechanisms are provided on the left and right sides of the top of the base box, respectively located on the left and right sides of the through-hole. A fiber optic limiting mechanism is fixedly installed on the right side of the base box, located to the right of the right base pad mechanism. A waste collection box is fixedly installed on the left side of the base box, located to the left of the left base pad mechanism. This utility model, through its magnetically stackable base pad mechanism and auxiliary docking pad structure, achieves rapid and tool-adjustable fiber optic support height adjustment, solving the problems of cumbersome adjustment and difficulty in guaranteeing cutting accuracy associated with traditional pressure pads. This significantly improves on-site operation efficiency and cutting success rate.

Description

Technical Field

[0001] This utility model relates to the field of fiber optic cutter technology, specifically to a fully automatic fiber optic cutter. Background Technology

[0002] High-quality fiber end face preparation is a key step in ensuring low-loss fusion splicing and efficient connection. The fiber optic cleaver is the core tool for preparing fiber end faces, and its performance directly determines the flatness, perpendicularity, and defect-free degree of the fiber end face. Currently, fiber optic cleavers on the market are mainly divided into manual, semi-automatic, and fully automatic types. For manual and semi-automatic cleavers, especially the widely used one-step mechanical cleaver, the basic working principle is that the user presses down on the top cover to complete the clamping of the fiber and the cutting of the blade in a continuous action.

[0003] Chinese patent document CN217861524U discloses a fully automatic fiber optic cleaver, including a base, a blade holder, a top cover, a blade return device, a pushing device, a top rod, and a positioning pin. The base has a sliding groove for the blade holder, which is slidably connected within the groove. One end of the top cover is hinged to the base, and one end of the pushing device is fixedly connected to the top cover, with the other end extending into the sliding groove through an opening. When the top cover is released, the pushing device, fixed to the top cover, operates, pushing the blade holder to a second position. At this point, the positioning pin extends into a positioning hole, completing the automatic blade loading action. When cutting the fiber, the top cover is pressed, and the top cover abuts against the top rod, causing the positioning pin to slide out of the positioning hole, driving the pushing device to move the blade holder to a first position. During this movement, the cutting blade on the blade holder automatically cuts the fiber, eliminating the need for any manual operation. This truly achieves fully automatic fiber optic cleaver operation, simplifying the operation steps of the fiber optic cleaver and significantly improving user efficiency and experience. The existing technology has the following problems:

[0004] Because the fiber optic clamping pad is a key component for positioning and holding the fiber, its position must precisely correspond to the cutting trajectory of the blade. In the aforementioned literature, the clamping pad and the base are connected by a complex screw structure. Adjustment requires special tools and involves repeatedly tightening multiple screws, which is cumbersome and makes it difficult to guarantee accuracy, greatly affecting on-site operation efficiency and cutting success rate. At the same time, the core advantage of the cutter lies in its automatic reset, that is, after the top cover is lifted, the blade holder can automatically return to the initial position to prepare for the next cut. However, the aforementioned literature uses a simple spring to directly pull back the blade holder. After long-term high-frequency use, these structures are prone to failure to reset due to wear, spring fatigue, or jamming. Once the reset fails, the blade will be exposed at the cutting position, which not only prevents the next cut but also poses a risk of scratching the operator or damaging the blade tip. Utility Model Content

[0005] This invention provides a fully automatic fiber optic cutter to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0007] A fully automatic fiber optic cleaver includes a base box with a hinged flip-up cover at the rear top. The top of the base box has a through-hole penetrating its interior. Two base pad mechanisms are located on the left and right sides of the top of the base box, respectively, on the left and right sides of the through-hole. A fiber optic limiting mechanism is fixedly installed on the right side of the base box, to the right of the right base pad mechanism. A waste collection box is fixedly installed on the left side of the base box, to the left of the left base pad mechanism. Both base pad mechanisms include mounting plates, which are fixedly installed on the base box. The top of the mounting plate has docking slots on both the front and rear sides. Several adjusting magnetic pads are provided on the top of the mounting plate. Positioning blocks are fixedly installed on the front and rear sides of the bottom of each adjusting magnetic pad. The bottom two positioning blocks of the lowest adjusting magnetic pad engage with the two docking slots on the bottom of the mounting plate, and the lowest adjusting magnetic pad adheres to the mounting plate. The top of each adjusting magnetic pad has two adjusting positioning grooves on both the front and rear sides. Adjacent adjusting magnetic pads are fixed together by the engagement of positioning blocks with the adjusting positioning grooves and by mutual adhesion.

[0008] A further improvement of the present invention is that the optical fiber limiting mechanism includes an optical fiber limiting plate, which is fixedly installed on the top right side of the base box, and a limiting groove is opened on the top of the optical fiber limiting plate. Positioning holes are opened on both the left and right sides of the bottom of the inner wall of the limiting groove, and the bottom of the inner wall of the limiting groove is horizontally aligned with the top of the mounting plate.

[0009] A further improvement of this utility model is that: the inner cavity of the limiting groove is fitted with a plurality of auxiliary docking pads stacked vertically, the plurality of auxiliary docking pads are respectively horizontally aligned with a plurality of adjusting magnetic pads, the right ends of the plurality of auxiliary docking pads all penetrate to the right side of the fiber optic limiting plate, two mounting blocks are fixedly installed at the bottom of the auxiliary docking pads, two mounting holes are opened at the bottom of the auxiliary docking pads, the two mounting blocks at the bottom of the lowest auxiliary docking pads are respectively engaged with the two positioning holes, and adjacent auxiliary docking pads are fixed together by the engagement of the mounting blocks and the mounting holes.

[0010] A further improvement of this utility model is that: a reset push rod is fixedly installed at the bottom of the flip cover; a push rod hole 1 penetrating the inner cavity is opened on the rear top side of the base box; a push rod hole 2 penetrating the inner cavity is opened on the rear bottom side of the base box; the bottom end of the reset push rod penetrates the push rod hole 1 into the inner cavity of the base box and is located above the push rod hole 2; a guide inclined plate is fixedly installed at the bottom of the inner wall of the base box; a blade plate is provided above the guide inclined plate; a cutting blade is fixedly installed on the left side of the blade plate; and the cutting blade is located inside the cutting through hole.

[0011] A further improvement of this utility model is that: a second sliding groove is provided on the front side of the reset push rod, a second sliding rod is fixedly installed between the upper and lower sides of the inner wall of the second sliding groove, a slider is slidably installed on the outer wall of the second sliding rod, a movable ring is fixedly installed at the front end of the slider, an extension rod is fixedly installed on the rear left side of the blade plate, and the movable ring is rotatably connected to the outer wall of the extension rod.

[0012] A further improvement of this utility model is that: a groove is provided on the top inclined surface of the guide plate; a sliding rod is fixedly installed between the front and rear sides of the inner wall of the groove; a metal slider is slidably connected to the outer wall of the sliding rod; a magnetic plate is fixedly installed on the front side of the inner wall of the groove; the magnetic plate and the metal slider are attracted to each other; and the top of the metal slider is movably connected to the bottom of the rear end of the blade plate.

[0013] Due to the adoption of the above technical solution, the technological progress achieved by this utility model compared to the prior art is as follows:

[0014] This utility model provides a fully automatic fiber optic cutter. Through a magnetically stackable base pad mechanism and an auxiliary docking pad structure, it achieves rapid, tool-free adjustment of the fiber optic support height, solving the problems of cumbersome adjustment and difficulty in ensuring accuracy in traditional pressure pad adjustments, and significantly improving on-site operation efficiency and cutting success rate.

[0015] This utility model provides a fully automatic fiber optic cutter, which adopts a reset mechanism that combines mechanical linkage and magnetic adsorption to ensure that the blade automatically and stably resets to the initial position when the flip cover is opened. This avoids the reset failure problem caused by spring fatigue or wear, and improves the safety and reliability of use. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the base pad mechanism of this utility model.

[0018] Figure 3 This is a schematic diagram of the fiber optic limiting mechanism of the present invention.

[0019] Figure 4 This is a schematic diagram of the inner cavity of the base box of this utility model.

[0020] Figure 5 This is a cross-sectional schematic diagram of the guide plate and reset push rod of this utility model.

[0021] In the diagram: 1. Base box; 11. Push rod hole one; 12. Push rod hole two; 13. Blade plate; 131. Cutting blade; 132. Extension rod; 14. Guide ramp; 141. Slide groove one; 142. Slide rod one; 143. Metal slider; 144. Magnetic plate; 2. Flip cover plate; 21. Reset push rod; 211. Slide groove two; 212. Slide rod two; 213. Slider; 214. Movable ring; 3. Cutting through hole; 4. Base pad mechanism; 41. Mounting plate; 42. Docking slot; 43. Adjusting magnetic pad; 44. Positioning block; 45. Adjusting positioning groove; 5. Fiber optic limiting mechanism; 51. Fiber optic limiting plate; 52. Limiting groove; 53. Positioning hole; 54. Auxiliary docking pad; 55. Mounting block; 56. Mounting hole; 6. Waste collection box. Detailed Implementation

[0022] To make the technical means, creative features, objectives and effects of this utility model easier to understand

[0023] Understood. The present invention will now be further described in conjunction with specific implementation methods.

[0024] like Figure 1 , Figure 2As shown, this utility model provides a fully automatic fiber optic cutter, including a base box 1. A flip-top plate 2 is hinged to the rear of the top of the base box 1. A cutting through hole 3 is opened on the top of the base box 1, penetrating its inner cavity. Two base pad mechanisms 4 are provided on the left and right sides of the top of the base box 1, respectively located on the left and right sides of the cutting through hole 3. A fiber optic limiting mechanism 5 is fixedly installed on the right side of the base box 1, located to the right of the right base pad mechanism 4. A waste collection box 6 is fixedly installed on the left side of the base box 1, located to the left of the left base pad mechanism 4. Both base pad mechanisms 4 include mounting plates 41, which are fixedly installed on the top of the base box 1. The mounting plate 41 has docking slots 42 on both the front and rear sides of the top. The top of the mounting plate 41 is provided with several adjusting magnetic pads 43. The bottom front and rear sides of the several adjusting magnetic pads 43 are fixedly installed with positioning blocks 44. The bottom two positioning blocks 44 of the bottom one of the several adjusting magnetic pads 43 are respectively engaged with the two docking slots 42 at the bottom of the mounting plate 41, and the bottom adjusting magnetic pad 43 is attracted to the mounting plate 41. The top of the several adjusting magnetic pads 43 has two front and rear adjusting positioning slots 45. Adjacent adjusting magnetic pads 43 are fixed by the engagement of positioning blocks 44 and adjusting positioning slots 45 and mutual attraction.

[0025] The base box 1 and the flip cover 2 are hinged and flipped together by a shaft. A torsion spring is provided at the connection between the base box 1 and the flip cover 2 to assist the flip cover 2 in opening. During operation, the cut fiber optic waste can fall directly into the inner cavity of the waste collection box 6 in the open state. At the same time, the bottom pad mechanism 4 is used to support the fiber optics. When it is necessary to adjust the height of the bottom pad mechanism 4, several mutually attracted adjustment magnetic pads 43 can be removed one by one to reduce the height until only the mounting plate 41 remains, which is the lowest height. Conversely, the adjustment magnetic pads 43 can be inserted into the docking slots 42 with the help of positioning blocks 44 and mutually attracted with the stainless steel mounting plate 41 to complete the addition of one layer of adjustment magnetic pads 43. Then, several adjustment magnetic pads 43 can be inserted one by one into the docking slots 42 on the top of the lower adjustment magnetic pads 43 with the help of positioning blocks 44 to complete the positioning. The mutual attraction of the adjustment magnetic pads 43 further improves the stability. The height can be adjusted without disassembly.

[0026] like Figure 3As shown, the fiber optic limiting mechanism 5 includes a fiber optic limiting plate 51, which is fixedly installed on the top right side of the base box 1. A limiting groove 52 is opened on the top of the fiber optic limiting plate 51. Positioning holes 53 are opened on both the left and right sides of the bottom of the inner wall of the limiting groove 52. The bottom of the inner wall of the limiting groove 52 is horizontally aligned with the top of the mounting plate 41. Several auxiliary docking pads 54 stacked vertically are engaged in the inner cavity of the limiting groove 52. The several auxiliary docking pads 54 are horizontally aligned with several adjusting magnetic pads 43. The right ends of the several auxiliary docking pads 54 all penetrate to the right side of the fiber optic limiting plate 51. Two mounting blocks 55 are fixedly installed on the bottom of the auxiliary docking pads 54. Two mounting holes 56 are opened on the bottom of the auxiliary docking pads 54. The two mounting blocks 55 at the bottom of the bottom of the lowest auxiliary docking pads 54 are engaged with the two positioning holes 53 respectively. Adjacent auxiliary docking pads 54 are fixed by the engagement of the mounting blocks 55 and the mounting holes 56.

[0027] To ensure stability during fiber optic cutting, the light can be limited by passing through the limiting groove 52. When only the mounting plate 41 remains in the bottom pad mechanism 4, the bottom of the limiting groove 52 can be aligned with the bottom of the mounting plate 41 without the need to add auxiliary docking pads 54. Similarly, as the height of the bottom pad mechanism 4 is adjusted, auxiliary docking pads 54 can be added one by one. The height of the upper and lower auxiliary docking pads 54 can be adjusted by the engagement of the mounting block 55 and the positioning hole 53, and by the engagement of the mounting block 55 and the mounting hole 56. This ensures that the part of the fiber optic cable inside the limiting groove 52 is level with the part above the bottom pad mechanism 4.

[0028] like Figure 4 , Figure 5As shown, a reset push rod 21 is fixedly installed at the bottom of the flip cover 2. A push rod hole 11 penetrating the inner cavity is opened on the rear side of the top of the base box 1, and a push rod hole 22 penetrating the inner cavity is opened on the rear side of the bottom of the base box 1. The bottom end of the reset push rod 21 passes through the push rod hole 11 to the inner cavity of the base box 1 and is located above the push rod hole 22. A guide plate 14 is fixedly installed at the bottom of the inner wall of the base box 1. A blade plate 13 is provided above the guide plate 14. A cutting blade 131 is fixedly installed on the left side of the blade plate 13. The cutting blade 131 is located inside the cutting through hole 3. A sliding groove 211 is opened on the front side of the reset push rod 21. A sliding groove 211 is fixedly installed between the upper and lower sides of the inner wall of the sliding groove 211. The slide bar 212 has a slider 213 slidably mounted on its outer wall. A movable ring 214 is fixedly mounted on the front end of the slider 213. An extension rod 132 is fixedly mounted on the rear left side of the blade plate 13. The movable ring 214 is rotatably connected to the outer wall of the extension rod 132. A slide groove 141 is opened on the top inclined surface of the guide plate 14. A slide bar 142 is fixedly mounted between the front and rear sides of the inner wall of the slide groove 141. A metal slider 143 is slidably connected to the outer wall of the slide bar 142. A magnetic plate 144 is fixedly mounted on the front side of the inner wall of the slide groove 141. The magnetic plate 144 and the metal slider 143 attract each other. The top end of the metal slider 143 is movably connected to the bottom rear end of the blade plate 13.

[0029] When cutting begins, the flip-top plate 2 is rotated and closed as a whole, thereby causing the reset push rod 21 to change from an inclined state to a vertical state. The movement trajectory of the reset push rod 21 is realized through the push rod hole 11 and the push rod hole 12. During the process of the reset push rod 21 moving towards the vertical state, the blade plate 13 can slide the slider 213 upward on the outer wall of the slider 212 in the slide groove 211 through the movable connection between the extension rod 132 and the movable ring 214, avoiding motion interference, thereby pulling the blade plate 13 to move backward. At the same time, since the lower rear end of the blade plate 13 is movably connected to the metal slider 143, the blade plate 13 will move towards the metal slider 143 through the sliding connection between the metal slider 143 and the slider 142. The upward and backward tilting motion trajectory eventually causes the cutting blade 131 to pass through the cutting through hole 3 and cut the optical fiber sandwiched between the base box 1 and the flip cover 2. When the flip cover 2 is opened, the reset push rod 21 can swing forward, so that the slider 213 controls the blade plate 13 to slide forward with the help of the movable ring 214. The blade plate 13 falls from a height by sliding the metal slider 143 and the slide rod 142 until it is in a horizontal state, thus retracting into the inside of the cutting through hole 3 to avoid leakage and accidental injury to the user. When resetting, the stainless steel metal slider 143 will attract each other to the magnetic plate 144, so that the blade plate 13 always remains in a horizontal and stable state, unaffected by the life of the spring.

[0030] The working principle of this fully automatic fiber optic cutter will be explained in detail below.

[0031] like Figure 1-5 As shown, the base box 1 and the flip cover 2 are hinged and flipped together via a shaft. A torsion spring is provided at the connection between the base box 1 and the flip cover 2 to assist in opening the flip cover 2. During operation, the cut fiber optic waste can fall directly into the inner cavity of the waste collection box 6 in the open state. At the same time, the bottom pad mechanism 4 is used to support the fiber optics. When it is necessary to adjust the height of the bottom pad mechanism 4, several mutually attracted adjustment magnetic pads 43 can be removed one by one to reduce the height until only the mounting plate 41 remains, which is the lowest height. Conversely, the adjustment magnetic pads 43 are inserted into the docking slots 42 with the help of positioning blocks 44 and are attracted to the stainless steel mounting plate 41 to complete the addition of one layer of adjustment magnetic pads 43. Then, several adjustment magnetic pads 43 can be removed one by one. The magnetic pads 43 are positioned one by one by the positioning blocks 44 and inserted into the docking slots 42 on the top of the lower adjusting magnetic pads 43. The mutual attraction of the adjusting magnetic pads 43 further improves stability, and the height can be adjusted without disassembly. At the same time, in order to ensure stability during fiber optic cutting, the light can be limited by passing through the limiting slot 52. When only the mounting plate 41 remains in the bottom pad mechanism 4, the bottom of the limiting slot 52 can be aligned with the bottom of the mounting plate 41 without the need to add auxiliary docking pads 54. Similarly, as the height of the bottom pad mechanism 4 is adjusted, auxiliary docking pads 54 can be added one by one. The height adjustment is achieved by the engagement of the mounting block 55 with the positioning hole 53 and the engagement of the upper and lower auxiliary docking pads 54 with the mounting block 55 with the mounting hole 56. The optical fiber is positioned so that the portion inside the limiting groove 52 is aligned with the portion above the base pad mechanism 4, maintaining a horizontal state. When cutting is required, the flip cover 2 is rotated and closed, thereby causing the reset push rod 21 to change from an inclined state to a vertical state. The movement trajectory of the reset push rod 21 is achieved through push rod hole 11 and push rod hole 12. During the movement of the reset push rod 21 towards the vertical state, the blade plate 13 can slide upward on the outer wall of the slide rod 212 within the slide groove 211 through the movable connection between the extension rod 132 and the movable ring 214, avoiding motion interference, thereby pulling the blade plate 13 backward. At the same time, since the lower rear end of the blade plate 13 is movably connected to the metal slider 143, the blade plate 13 will utilize the metal... The slider 143 and the slide rod 142 slide together, moving in a backward and upward tilting motion trajectory. This allows the cutting blade 131 to pass through the cutting through hole 3 and cut the optical fiber sandwiched between the base box 1 and the flip cover 2. When the flip cover 2 is opened, the reset push rod 21 swings forward, causing the slider 213 to slide forward using the movable ring 214. The blade plate 13 then falls from a height using the sliding of the metal slider 143 and the slide rod 142 until it remains horizontal, thus retracting into the inside of the cutting through hole 3 to prevent accidental injury to the user. During reset, the stainless steel metal slider 143 attracts the magnetic plate 144, keeping the blade plate 13 in a stable horizontal position, unaffected by the lifespan of the spring.

[0032] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the protection scope of the present invention.

Claims

1. Fully automatic optical fiber cutter comprising a base box (1), characterized in that: A flip cover plate (2) is hinged to the rear top of the base box (1). A through-hole (3) penetrating the inner cavity is opened on the top of the base box (1). A base pad mechanism (4) is provided on both the left and right sides of the top of the base box (1). The two base pad mechanisms (4) are located on the left and right sides of the through-hole (3), respectively. A fiber optic limiting mechanism (5) is fixedly installed on the right side of the base box (1). The fiber optic limiting mechanism (5) is located to the right of the right base pad mechanism (4). A waste collection box (6) is fixedly installed on the left side of the base box (1). The waste collection box (6) is located to the left of the left base pad mechanism (4). Both base pad mechanisms (4) include a mounting plate (41). The mounting plate (41) is fixedly installed on the top of the base box (1). The top and front and back sides of the mounting plate (41) are provided with docking slots (42). The top of the mounting plate (41) is provided with several adjusting magnetic pads (43). The bottom and front and back sides of the several adjusting magnetic pads (43) are fixedly installed with positioning blocks (44). The bottom two positioning blocks (44) of the bottom one of the several adjusting magnetic pads (43) are respectively engaged with the two docking slots (42) at the bottom of the mounting plate (41). The bottom adjusting magnetic pad (43) and the mounting plate (41) are mutually attracted. The top of the several adjusting magnetic pads (43) is provided with two front and back adjusting positioning grooves (45). The two adjacent adjusting magnetic pads (43) are fixed by the engagement of the positioning blocks (44) and the adjusting positioning grooves (45) and mutual attraction.

2. The fully automatic optical fiber cleaver according to claim 1, characterized in that: The fiber optic limiting mechanism (5) includes a fiber optic limiting plate (51), which is fixedly installed on the top right side of the base box (1). A limiting groove (52) is opened on the top of the fiber optic limiting plate (51), and positioning holes (53) are opened on both the left and right sides of the bottom of the inner wall of the limiting groove (52). The bottom of the inner wall of the limiting groove (52) is horizontally aligned with the top of the mounting plate (41).

3. The fully automatic optical fiber cleaver according to claim 2, characterized in that: The inner cavity of the limiting groove (52) is fitted with several auxiliary docking pads (54) stacked vertically. The auxiliary docking pads (54) are horizontally aligned with several adjusting magnetic pads (43) respectively. The right ends of the auxiliary docking pads (54) all extend to the right side of the fiber optic limiting plate (51). Two mounting blocks (55) are fixedly installed at the bottom of the auxiliary docking pads (54). Two mounting holes (56) are opened at the bottom of the auxiliary docking pads (54). The two mounting blocks (55) at the bottom of the lowest auxiliary docking pads (54) are respectively engaged with the two positioning holes (53). The two adjacent auxiliary docking pads (54) are fixed by the engagement of the mounting blocks (55) and the mounting holes (56).

4. The fully automatic optical fiber cleaver according to claim 1, wherein: A reset push rod (21) is fixedly installed at the bottom of the flip cover (2). A push rod hole (11) penetrating the inner cavity is opened on the rear side of the top of the base box (1). A push rod hole (12) penetrating the inner cavity is opened on the rear side of the bottom of the base box (1). The bottom end of the reset push rod (21) passes through the push rod hole (11) to the inner cavity of the base box (1) and is located above the push rod hole (12). A guide plate (14) is fixedly installed at the bottom of the inner wall of the base box (1). A blade plate (13) is provided above the guide plate (14). A cutting blade (131) is fixedly installed on the left side of the blade plate (13). The cutting blade (131) is located inside the cutting through hole (3).

5. The fully automatic optical fiber cleaver according to claim 4, characterized in that: The reset push rod (21) has a sliding groove (211) on its front side. A sliding rod (212) is fixedly installed between the upper and lower sides of the inner wall of the sliding groove (211). A slider (213) is slidably installed on the outer wall of the sliding rod (212). A movable ring (214) is fixedly installed at the front end of the slider (213). An extension rod (132) is fixedly installed on the rear left side of the blade plate (13). The movable ring (214) is rotatably connected to the outer wall of the extension rod (132).

6. The fully automatic fiber optic cleaver according to claim 4, characterized in that: The top inclined surface of the guide plate (14) is provided with a sliding groove (141). A sliding rod (142) is fixedly installed between the front and rear sides of the inner wall of the sliding groove (141). A metal slider (143) is slidably connected to the outer wall of the sliding rod (142). A magnetic plate (144) is fixedly installed on the front side of the inner wall of the sliding groove (141). The magnetic plate (144) and the metal slider (143) are attracted to each other. The top of the metal slider (143) is movably connected to the bottom of the rear end of the blade plate (13).

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