Scissors with stable structure

Abstract

The utility model discloses a cutter with a stable structure, and relates to the technical field of cutters. The device comprises a shell, a fixed blade, a movable blade, an arc-shaped tooth piece, driving teeth, a driving device, a mobile power source and a mounting frame, a battery bin for placing the mobile power source is arranged at the bottom end of the shell, the mobile power source is transversely limited and mounted in the battery bin through a clamping piece, the driving device is arranged in the shell, and the output end of the driving device is connected with the driving teeth. The driving teeth are meshed with arc-shaped tooth pieces, the arc-shaped tooth pieces are connected with the movable blades through linkage shafts, a gear ring is arranged on the periphery of the nut, a plurality of clamping teeth are arranged on the gear ring at equal intervals, clamping jaws are fixedly installed on the installation frame in a locking mode, and the clamping jaws are clamped into gaps between the clamping teeth to limit deviation of the nut. Through the meshing locking design of the three-clamping-head clamping jaw and the gear ring, blade deviation caused by nut looseness is effectively prevented, contact of at least two points can still be kept even under the condition that a single clamping head is abraded or foreign matter invades, and it is guaranteed that a blade set works stably for a long time.

Description

Technical Field

[0001] This utility model relates to the field of cutting shears, specifically a structurally stable cutting shear. Background Technology

[0002] Current electric cutting shears generally use a conventional nut-fixed blade assembly design, which has significant drawbacks in practical use: under continuous high-frequency vibration, traditional nuts are prone to gradual loosening, leading to increased clearance in the blade assembly and directly affecting cutting accuracy and work efficiency. Especially in high-intensity industrial cutting operations, this structural defect can cause blade misalignment and poor engagement, not only reducing product quality but also posing a safety hazard of blade detachment. While existing technologies have attempted to use spring washers or thread-locking adhesives to prevent loosening, they cannot fundamentally solve the connection failure problem caused by high-frequency vibration. Therefore, there is an urgent need to develop a new blade fixing mechanism with a self-locking function to improve the structural stability and safety of the cutting shears, meeting the reliability requirements of modern industrial manufacturing for precision cutting tools. Utility Model Content

[0003] This invention provides a structurally stable cutting tool that overcomes the shortcomings described in the background art.

[0004] The technical solution adopted by this utility model to solve its technical problem is:

[0005] A structurally stable cutting shear includes a housing, a fixed blade, a movable blade, an arc-shaped toothed blade, a drive tooth, a drive device, a power supply, and a mounting frame. The bottom of the housing has a battery compartment for housing the power supply, which is laterally secured within the battery compartment by fasteners. A drive device is located inside the housing, with its output end connected to drive teeth that mesh with the arc-shaped toothed blade. The housing has an arc-shaped groove for displacing the arc-shaped toothed blade. The arc-shaped toothed blade, movable blade, and fixed blade are stacked on the mounting frame via a shaft and nut. The arc-shaped toothed blade is connected to the movable blade via a linkage shaft. A toothed ring is provided around the nut, with several evenly spaced locking teeth on the ring. A locking claw is locked onto the mounting frame, engaging with the gaps between the locking teeth to restrict nut displacement.

[0006] The drive gear (pinion) meshes with the arc-shaped gear (arc gear), converting the rotational motion of the drive unit into the reciprocating oscillation of the arc-shaped gear. The motion trajectory of the arc-shaped gear is constrained by the arc groove on the housing, ensuring it moves along a fixed path. The fixed blade is fixed to the mounting bracket and does not move, providing support for the shearing force; the movable blade is connected to the arc-shaped gear via a linkage shaft and reciprocates with the oscillation of the arc-shaped gear, forming a shearing action with the fixed blade. The outer ring of the nut is equipped with a toothed ring (with retaining teeth), and the retaining claws on the mounting bracket engage with the gap of the toothed ring to prevent the nut from loosening and causing the blade to misalign.

[0007] A preferred technical solution: Several locking heads are provided on the jaws. The locking heads engage with the gaps between the teeth to limit nut displacement, and the gaps are adapted to the locking heads. Multiple (e.g., 2-3) locking heads are provided at the ends of the jaws. The locking heads are wedge-shaped or hemispherical and match the gaps between the teeth on the gear ring. Their function is to distribute the stress points and avoid single-point wear. When the locking heads engage with multiple gaps simultaneously, multi-point locking is formed, which strengthens the anti-displacement capability. The gap width between the teeth is slightly larger than the thickness of the locking heads (approximately 0.1-0.2mm gap) to ensure no rigid collision during engagement and reduce metal fatigue.

[0008] A preferred technical solution: Three clamps are set up, and the three clamps are simultaneously engaged in the gap of the toothed ring. Even if a single clamp wears out or foreign objects intrude, at least two points of contact can still be maintained, improving the anti-displacement capability by more than 50%.

[0009] A preferred technical solution: The drive unit includes a speed reducer.

[0010] A preferred technical solution: A control circuit board is installed above the battery compartment, and control buttons are installed on the housing.

[0011] A preferred technical solution: The inner side of the battery compartment is provided with a slot for cooperating with a fastener. The fastener includes a button, a connector, and a spring. The connector is integrally provided on the side of the button, and the spring is installed at the bottom of the button. By pressing the spring with the button, the connector is offset downward and disengaged from the slot.

[0012] A preferred technical solution: The power bank is a lithium battery.

[0013] A preferred technical solution: A magnetic switch is installed on the housing. Integrating a magnetic switch on the housing of the scissors enables intelligent start and stop control of the drive device, improving safety and ease of operation. The magnetic switch is usually installed on the inside of the handle of the housing (near the thumb operating area). Its triggering logic is: the circuit is open when not pressed, and closed and energized when the magnet is close, directly controlling the start and stop of the drive device.

[0014] A preferred technical solution: the drive gear is a bevel gear.

[0015] A preferred technical solution: The reducer incorporates a torque limiter. Common reducers incorporate a torque limiter (such as a spring-loaded ball bearing structure), which slips when the shearing resistance exceeds 15 N·m, protecting the drive gears. Specifically, a planetary gear reducer (reduction ratio 10:1 to 15:1) can be used to reduce the drive's 3000 rpm output to 200-300 rpm, meeting the shearing frequency requirement (30-50 times / minute).

[0016] By adopting the above technical solution, the beneficial effects of this utility model are:

[0017] This invention utilizes a three-jaw chuck locking design with a gear ring to effectively prevent blade misalignment caused by nut loosening. Even with wear on a single chuck or foreign object intrusion, at least two points of contact are maintained, ensuring long-term stable operation of the blade assembly. The arc-shaped groove precisely guides the movement trajectory of the arc-shaped gear blades, and combined with the high-precision transmission of the drive unit and planetary reducer, the cutting action becomes more accurate and reliable, significantly improving the durability and stability of the cutting shears in high-frequency industrial applications. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0021] Figure 3 This is a schematic diagram of the structure where the arc-shaped gear plate and the drive gear mesh.

[0022] Figure 4 for Figure 1 A magnified view of a section at point A in the middle;

[0023] Figure 5 This is a schematic diagram of the arc-shaped toothed plate.

[0024] Figure 6 This is a schematic diagram of the card firmware structure;

[0025] Figure 7 This is a schematic diagram of the card slot inside the battery compartment.

[0026] Explanation of key figure labels:

[0027] 1. Housing; 101. Battery compartment; 102. Arc groove; 103. Slot; 2. Fixed blade; 3. Movable blade; 31. Arc-shaped toothed plate; 32. Linkage shaft; 4. Drive unit; 41. Drive gear; 42. Reducer; 5. Power bank; 51. Fastener; 511. Button; 512. Connector; 6. Mounting bracket; 7. Shaft; 8. Nut; 81. Gear ring; 82. Clamping tooth; 83. Gap; 9. Clamping claw; 91. Clamping head; 10. Control circuit board; 11. Control button; 12. Magnetic switch. Detailed Implementation

[0028] like Figures 1-7As shown, a structurally stable cutting shear includes a housing 1, a fixed blade 2, a movable blade 3, an arc-shaped toothed piece 31, a drive tooth 41, a drive device 4, a power supply 5, and a mounting frame 6. The bottom of the housing 1 is provided with a battery compartment 101 for the power supply 5 to be placed inside, and the power supply 5 is laterally limited and installed in the battery compartment 101 by a fastener 51. The drive device 4 is provided inside the housing 1, and the output end of the drive device 4 is connected to the drive tooth 41. The drive tooth 41 meshes with the arc-shaped toothed piece 31. The housing 1 is provided with an arc-shaped groove 102 for the displacement of the arc-shaped toothed piece 31. The arc-shaped toothed piece 31, the movable blade 3, and the fixed blade 2 are stacked and installed on the mounting frame 6 through a shaft 7 and a nut 8. The arc-shaped toothed piece 31 is connected to the movable blade 3 through a linkage shaft 32. A toothed ring 81 is provided around the outer periphery of the nut 8, and a number of locking teeth 82 are provided at equal intervals on the toothed ring 81. A locking claw 9 is locked on the mounting frame 6, and the locking claw 9 engages with the gap 83 between the locking teeth 82 to limit the displacement of the nut 8.

[0029] The drive gear 41 (pinion) meshes with the arc-shaped gear 31 (arc gear), converting the rotational motion of the drive device 4 into the reciprocating oscillation of the arc-shaped gear 31. The movement trajectory of the arc-shaped gear 31 is constrained by the arc groove 102 on the housing 1, ensuring that it moves along a fixed path. The fixed blade 2 is fixed on the mounting bracket 6 and does not move, providing support for shearing force; the movable blade 3 is connected to the arc-shaped gear 31 through the linkage shaft 32, and reciprocates with the oscillation of the arc-shaped gear 31, forming a shearing action with the fixed blade 2. The outer ring of the nut 8 is provided with a toothed ring 81 (with retaining teeth 82), and the retaining claws 9 on the mounting bracket 6 are engaged in the gap of the toothed ring 81 to prevent the nut 8 from loosening and causing the blade to misalign.

[0030] Furthermore, the jaw 9 is provided with several clamping heads 91. The clamping heads 91 engage with the gaps 83 between the clamping teeth 82 to limit the displacement of the nut 8. The gaps 83 are adapted to the clamping heads 91. Multiple (e.g., 2-3) clamping heads 91 are provided at the end of the jaw 9. The clamping heads 91 are wedge-shaped or hemispherical and match the gaps of the clamping teeth 82 on the gear ring 81. Their function is to distribute the stress points and avoid single-point wear. When the clamping heads 91 engage with multiple gaps at the same time, multi-point locking is formed, which has a stronger anti-displacement ability. The width of the gaps 83 between the clamping teeth 82 is slightly larger than the thickness of the clamping heads 91 (about 0.1-0.2mm gap) to ensure that there is no rigid collision when engaging and reduce metal fatigue.

[0031] Furthermore, three clamping heads 91 are provided, and the three clamping heads 91 are simultaneously engaged in the gap 83 of the toothed ring 81. Even if a single clamping head 91 is worn or foreign objects intrude, at least two points of contact can still be maintained, improving the anti-displacement capability by more than 50%.

[0032] Furthermore, the drive unit 4 includes a speed reducer 42.

[0033] Furthermore, a control circuit board 10 is provided above the battery compartment 101, and control buttons 11 are provided on the housing 1.

[0034] Furthermore, the inner side of the battery compartment 101 is provided with a slot 103 for cooperating with the fastener 51. The fastener 51 includes a button 511, a connector 512, and a spring. The connector 512 is integrally provided on the side end of the button 511, and the spring is installed at the bottom end of the button 511. By pressing the spring with the button 511, the connector 512 is offset downward and disengaged from the slot 103.

[0035] Furthermore, the power bank 5 uses a lithium battery.

[0036] Furthermore, a magnetic switch 12 is provided on the housing 1. The magnetic switch 12 is integrated on the housing 1 of the scissors, which can realize intelligent start and stop control of the drive device 4, improving safety and ease of operation. The magnetic switch 12 is usually installed on the inside of the handle of the housing 1 (near the thumb operation area). Its triggering logic is: the circuit is open when not pressed, and closed and energized when the magnet is close, directly controlling the start and stop of the drive device 4.

[0037] Furthermore, the drive gear 41 is a bevel gear.

[0038] Furthermore, the reducer 42 incorporates a built-in torque limiter (such as a spring ball structure) that slips when the shearing resistance exceeds 15 N·m, protecting the gears of the drive unit 4. Specifically, the reducer 42 can be a planetary gear reducer (reduction ratio 10:1 to 15:1), reducing the drive unit's 3000 rpm output to 200-300 rpm to meet the shearing frequency requirement (30-50 times / minute).

[0039] This cutting shear adopts a structure design of drive device 4 + gear transmission + blade linkage to achieve efficient and stable cutting function. Its working principle is as follows: After drive device 4 is started, the planetary reducer 42 reduces the speed and increases the torque. The output end of drive device 4 drives drive gear 41 to rotate. Drive gear 41 meshes with arc-shaped gear 31 (arc gear), converting the rotational motion into the reciprocating oscillation of arc-shaped gear 31. The oscillation trajectory is precisely limited by the arc groove 102 on the housing 1. Fixed blade 2 is fixed on mounting bracket 6, forming a cutting edge with movable blade 3. The relative motion achieves material cutting. The blade assembly (arc-shaped gear 31, movable blade 3, fixed blade 2) is fixed by a shaft 7 and nut 8. The outer ring 81 of nut 8 meshes with the three-jaw chuck 91 on mounting bracket 6 to prevent the nut 8 from loosening and causing blade misalignment. The elastic design of the chuck 9 allows manual adjustment of nut 8 while maintaining a locked position under high load. The magnetic switch 12 is triggered by thumb pressure to control the start and stop of the drive unit 4. Releasing the switch cuts off the power and brakes, ensuring operational safety. The reducer 42 has a built-in torque limiter to protect the drive unit 4 from slippage in case of overload. Powered by a lithium battery, the locking mechanism 51 facilitates quick battery replacement. This cutting shears achieve efficient cutting, long-term stable operation, and reliable safety through precision gear transmission and multi-point mechanical locking, making it suitable for high-frequency applications such as industrial cutting and garden pruning.

[0040] The above description is only a preferred embodiment of the present utility model, and therefore cannot be used to limit the scope of the present utility model. All equivalent changes and modifications made in accordance with the scope of the present utility model patent and the contents of the specification should still fall within the scope of the present utility model.

Claims

1. A constructionally stable cutting knife characterized in that, The utility model provides a cutting device, including casing, fixed blade, movable blade, arc toothed piece, driving tooth, drive arrangement, mobile power supply, mounting frame, the casing bottom is provided with the battery compartment that mobile power supply is placed into, and mobile power supply is installed in the battery compartment through the lateral limit of card fastener, drive arrangement is arranged in the casing, the output of drive arrangement is connected driving tooth, driving tooth and arc toothed piece are engaged, the casing is provided with the arc groove that arc toothed piece displacement is arranged, arc toothed piece, movable blade, fixed blade are installed on mounting frame through the cooperation of shaft stem, nut and are added, arc toothed piece is connected with movable blade through linkage shaft, the outer periphery of nut is provided with gear ring, a plurality of clamping teeth are arranged on the gear ring at equal intervals, the pawl is locked and is installed on the mounting frame, and the pawl is clamped into the clearance between clamping teeth and restricts the deviation of nut.

2. The structurally stable cutting tool of claim 1, wherein, The pawl is provided with a plurality of clamping heads, the clamping heads are clamped into the clearance between the clamping teeth to restrict the deviation of the nut, and the clearance is matched with the clamping heads.

3. The structurally stable cutting tool of claim 2, wherein, The clamping head is provided with three.

4. The structurally stable cutting tool of claim 1, wherein, The drive arrangement includes a speed reducer.

5. The structurally stable cutting tool of claim 1, wherein, A control circuit board is arranged above the battery compartment, and the casing is provided with control buttons.

6. The structurally stable cutting tool of claim 1, wherein, The inner side of the battery compartment is provided with a clamping groove for cooperation with the clamping piece, and the clamping piece includes a button, a connecting head and a spring.

7. The structurally stable cutting tool of claim 1, wherein, The mobile power supply is a lithium battery.

8. The structurally stable cutting tool of claim 1, wherein, A magnetic control switch is arranged on the casing.

9. The structurally stable cutting tool of claim 1, wherein, The driving tooth is a bevel gear.

10. The structurally stable cutting tool of claim 4, wherein, The speed reducer is provided with a torque limiter.

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