A cutting tool for a fixed length cutting machine

Abstract

The present application relates to a kind of knives for fixed-length cutting machine, including installation bottom plate, lower bottom plate, first tool seat, second tool seat, first moving blade, second moving blade, entrance static blade, exit static blade, transition guide groove, guide groove pressure piece, pressing plate and two reset compression springs;First moving blade, entrance static blade, exit static blade and second moving blade are respectively provided with cutting hole;When two moving blades are in reset position, four cutting holes in the same hole position are coaxially arranged along the direction of wire conveying;Transition guide groove is arranged between entrance static blade and exit static blade;Pressing plate is across the top of two moving blades;Two reset compression springs are respectively arranged between corresponding moving blade and tool seat.The knife for fixed-length cutting machine designed using the present application can solve the technical problems of insufficient positioning stability, irregular cut, insufficient length consistency and inconvenient specification switching when cutting small-diameter nickel-titanium alloy wire.

Description

Technical Field

[0001] This invention relates to the field of metal wire processing equipment technology, and specifically to a cutting tool for a fixed-length cutting machine. Background Technology

[0002] Nickel-titanium alloy wires possess shape memory effect, superelasticity, corrosion resistance, and biocompatibility, making them widely used in medical devices, precision electronics, and aerospace components. The manufacturing process for these products typically requires processing continuous wires into short segments of specified lengths. The consistency of the cut length, the flatness of the end face, and the stability of the feeding process affect subsequent assembly, forming, and quality inspection. For smaller diameter nickel-titanium alloy wires, which have lower stiffness and stronger elastic recovery, the cutting process is easily affected by feeding resistance, lateral shearing forces, and tool clearance. Therefore, high requirements are placed on the positioning accuracy, guiding method, shearing synchronization, and repeatability of the cutting tool.

[0003] Existing small-diameter wire cutting equipment mostly uses a single moving blade in conjunction with a fixed blade to complete the cutting. The wire lacks continuous guidance and stable constraint near the cutting position. When the moving blade applies unilateral shearing force, the flexible wire is prone to bending, springing back, or axial movement, resulting in slanted cuts, end deformation, and fluctuations in cutting length. When switching between different target lengths or different wire diameters, some equipment requires replacing the entire blade and guide components or reassembling the cutting assembly. Inconsistent adjustment benchmarks and cumbersome hole alignment and cutting position calibration make it difficult to balance processing accuracy, changeover efficiency, and continuous operation stability.

[0004] Therefore, existing technologies have shortcomings and need to be improved and developed. Summary of the Invention

[0005] The present invention provides a cutting tool for a fixed-length cutting machine to solve the technical problems of insufficient positioning stability, irregular cut, insufficient length consistency and inconvenient specification switching when cutting small-diameter nickel-titanium alloy wires to a fixed length in the prior art.

[0006] This invention provides a cutting tool for a fixed-length cutting machine, comprising a mounting base plate, two lower base plates, two tool holders, two moving blades, an inlet stationary blade, an outlet stationary blade, a transition guide groove, a guide groove clamping element, a pressure plate, and two reset springs;

[0007] Two lower base plates are installed at intervals on the mounting base plate along the wire conveying direction, and two tool holders are respectively fixed to the two lower base plates; along the wire conveying direction, the two tool holders are respectively a first tool holder and a second tool holder, and the two moving blades are respectively a first moving blade and a second moving blade.

[0008] The first moving blade, the inlet stationary blade, the outlet stationary blade, and the second moving blade are each provided with a cutting hole; when the two moving blades are in the reset position, the four cutting holes in the same position are coaxially arranged along the wire conveying direction;

[0009] The transition guide groove is disposed between the inlet stationary blade and the outlet stationary blade. The transition guide groove has a wire guide channel that extends along the wire conveying direction. The inlet of the wire guide channel is coaxial with a selected cutting hole in the inlet stationary blade, and the outlet of the wire guide channel is coaxial with a selected cutting hole in the outlet stationary blade. The guide groove clamping member presses and positions the transition guide groove between the two blade holders by fastening bolts.

[0010] The pressure plate spans over the two moving blades, and the lower surface of the pressure plate is respectively positioned opposite to the upper ends of the two moving blades. When the pressure plate moves downward, it simultaneously abuts against and pushes the two moving blades downward.

[0011] Two reset springs are respectively disposed between the corresponding moving blade and the blade holder; when the pressure plate pushes the two moving blades downward, the cutting hole of the first moving blade is offset downward relative to the cutting hole of the inlet stationary blade, and the cutting hole of the second moving blade is offset downward relative to the cutting hole of the outlet stationary blade, so as to form a shearing action between the first moving blade and the inlet stationary blade and between the outlet stationary blade and the second moving blade respectively; after the pressure plate moves upward and releases the downward pressure on the two moving blades, the two reset springs respectively push the corresponding moving blades back to the reset position.

[0012] Furthermore, the moving blade includes a blade body extending in the vertical direction and a transverse shoulder disposed on the upper part of the blade body to form a T-shaped structure; the tool holder is provided with a T-shaped groove extending in the vertical direction and adapted to the moving blade, the T-shaped groove including a guide portion for sliding of the blade body and a limiting surface cooperating with the transverse shoulder; one end of the reset spring abuts against the lower end of the moving blade, and the other end is supported on the tool holder; when the reset spring pushes the moving blade upward until the transverse shoulder abuts against the limiting surface, the moving blade is in the reset position, and the cutting hole of the moving blade is coaxial with the cutting hole in the adjacent stationary blade that is in the same position.

[0013] Furthermore, the first moving blade, the inlet stationary blade, the outlet stationary blade, and the second moving blade are each provided with six cutting holes laterally distributed along the horizontal plane perpendicular to the wire conveying direction. The six cutting holes on each blade have the same hole position distribution. The six cutting holes include a first hole group and a second hole group, and the first hole group and the second hole group each include three cutting holes. The diameter of each cutting hole in the first hole group is 0.8 mm, used for threading wire with a diameter of 0.7 mm. The diameter of each cutting hole in the second hole group is 0.85 mm, used for threading wire with a diameter of 0.75 mm. The center distance between two adjacent cutting holes in the same hole group is 3 mm. When the two moving blades are in the reset position, the four cutting holes in the same hole position on each blade are coaxially arranged along the wire conveying direction.

[0014] Furthermore, the first moving blade, the second moving blade, the inlet stationary blade, and the outlet stationary blade are all made of Cr12MoV material with a hardness of HRC 58~63; the two lower base plates and the two tool holders are all made of Cr12 material with a hardness of HRC 55~60.

[0015] Furthermore, each of the lower base plates is provided with at least one first waist hole extending along the wire conveying direction. The length of the first waist hole is 26mm. An M5 hexagon socket bolt passes through the first waist hole and is connected to the mounting base plate. When the M5 hexagon socket bolt is in the loose state, the two lower base plates slide relative to the mounting base plate along the wire conveying direction. After the M5 hexagon socket bolt is tightened, the two lower base plates are fixed in the adjustment position, so that the distance between the first shearing plane and the second shearing plane is 52mm~104mm.

[0016] Furthermore, the mounting base plate is provided with at least one second waist hole extending laterally in the horizontal plane perpendicular to the wire conveying direction. The length of the second waist hole is 16mm. An M5 hexagon socket bolt passes through the second waist hole and is connected to the equipment base plate of the fixed-length cutting machine. When the M5 hexagon socket bolt is in the loose state, the mounting base plate slides relative to the equipment base plate in the lateral direction. After the M5 hexagon socket bolt is tightened, the axis of the four cutting holes on each blade at the same position coincides with the wire conveying path.

[0017] Furthermore, the guide groove clamping member is disposed above the transition guide groove, and the guide groove clamping member has at least one third waist hole extending along the wire conveying direction. The fastening bolt passes through the third waist hole and is connected to the corresponding tool holder. When the fastening bolt is in the loose state, the guide groove clamping member releases the clamping of the transition guide groove, and the transition guide groove is adjusted along the wire conveying direction. After the guide groove clamping member is adjusted to the clamping position along the third waist hole and the fastening bolt is locked, the guide groove clamping member clamps and fixes the transition guide groove between the inlet stationary blade and the outlet stationary blade.

[0018] Furthermore, the transition guide groove is provided with a guide channel for the filament to pass through. The inlet section of the guide channel is a funnel-shaped opening that gradually narrows along the filament conveying direction. The larger end of the funnel-shaped opening is located on the feeding side, and the diameter of the larger end is larger than the diameter of the smaller end of the funnel-shaped opening but not greater than 1.3 mm. The smaller end of the funnel-shaped opening is located on the discharge side. When the cutter is used to cut filament with a diameter of 0.70 mm, the diameter of the smaller end is 0.75 mm. When the cutter is used to cut filament with a diameter of 0.75 mm, the diameter of the smaller end is 0.80 mm.

[0019] Furthermore, the pressure plate is connected to the cylinder output end of the fixed-length cutting machine; when the cylinder output end moves downward, the pressure plate simultaneously pushes the two moving blades from the reset position to the cutting position; when the cylinder output end returns and drives the pressure plate to move upward, the pressure plate releases the downward pressure on the two moving blades, and the two reset springs respectively push the corresponding moving blades back to the reset position.

[0020] Beneficial effects:

[0021] As can be seen from the above technical solutions, the present invention provides a cutting tool for a fixed-length cutting machine, which has the following beneficial effects:

[0022] 1. Synchronized action at both shearing positions facilitates control of the cutting length: The first moving blade and the inlet stationary blade constitute the first shearing position, while the outlet stationary blade and the second moving blade constitute the second shearing position. Both moving blades are pushed downwards simultaneously by the same pressure plate. Since the two shearing actions are triggered by the same drive stroke, the structural distance between the first and second shearing positions directly limits the length of the resulting filament segment, reducing the cumulative error caused by continued feeding movement, filament springback, or changes in positioning reference during sequential cutting. Shearing is completed at both ends within the same work cycle, with the two ends of the filament segment sheared by the corresponding moving and stationary blades respectively. This transforms the determination of the cutting length from being solely controlled by the feeding stroke to being jointly controlled by the feeding position and the structural distance between the two shearing planes, thus improving the consistency of the filament segment length during continuous cutting.

[0023] 2. Multi-segment continuous guidance helps reduce flexible filament deviation: The filament passes sequentially through the first moving blade, the inlet stationary blade, the transition guide groove, the outlet stationary blade, and the second moving blade. The four cutting holes and the wire guide channel of the transition guide groove together form a continuous feeding path. The inlet and outlet stationary blades are located at opposite ends of the transition guide groove, keeping the filament in a constrained state between the two shearing positions, reducing sagging, bending, and lateral swaying caused by low stiffness and hyperelasticity in the middle suspended section. The inlet section of the transition guide groove adopts a gradually narrowing flared opening, allowing the slightly deviated filament to gradually enter the small end channel, reducing the probability of the filament end directly hitting the edge of the small hole. The above continuous guiding relationship keeps the feeding path, hole axis, and shearing position consistent, which helps improve feeding smoothness and cut flatness.

[0024] 3. T-shaped guide and spring return mechanism improve repeatability and stability: The moving blade is embedded in a T-shaped groove extending vertically. The T-shaped groove provides lateral constraint to the moving blade, causing it to reciprocate in a defined direction during cutting and resetting. The lateral shoulder on the upper part of the moving blade abuts against the limiting surface inside the blade holder to determine the reset height, while the reset spring continuously applies an upward reset force to the moving blade. Thus, after each cut, the moving blade returns to the position determined by the solid limiting surface, rather than relying solely on the cylinder return position or the spring's free length to determine the hole position. The cutting hole is re-coaxial with the cutting hole of the adjacent stationary blade in the reset position, which helps reduce lateral offset and cumulative height errors after multiple cycles and provides a stable path for subsequent wire feeding.

[0025] 4. Longitudinal Adjustment Structure Expands the Target Length Adaptation Range: Two lower base plates are mounted on the mounting base plate through first waist holes extending along the wire feeding direction. After loosening the fastening bolts, the two lower base plates move longitudinally, thereby changing the distance between the first and second shearing planes. Each first waist hole provides a 26mm longitudinal adjustment stroke, and the combined position of the two lower base plates allows the shearing plane spacing to cover 52mm~104mm. Length adjustment uses the two shearing planes as the measurement reference, avoiding mistaking blade thickness, blade holder shape, or lower base plate edge as the cutting length. The longitudinal fine-tuning structure, in conjunction with transition guide grooves of different lengths, can adapt to various target lengths while maintaining the dual-blade synchronous shearing method, reducing the need for separate complete blade assemblies for each length specification.

[0026] 5. The transverse hole-changing structure accommodates different wire diameters and multiple working hole positions: Six cutting holes with the same hole position distribution are set on each of the four blades. Three are located in the first hole group with a 0.8mm diameter, and the other three are located in the second hole group with a 0.85mm diameter, adapting to wire diameters of 0.7mm and 0.75mm respectively. The mounting base plate moves relative to the equipment base plate via a transversely extending second waist hole, allowing the cutting holes on the four blades at the same position to sequentially coincide with the wire conveying path. Switching between different hole positions does not require disassembling the blades and blade holder, accommodating changes in wire specifications and facilitating the switching to other cutting holes in the same group after one cutting hole wears out. Multiple working hole positions distribute the localized wear caused by long-term cutting, helping to maintain the condition of the cutting edge and extending the effective service life of the entire blade group.

[0027] 6. Improved Feeding Adaptability Through Transition Guide Groove Size and Adjustment: The transition guide groove is located between the inlet and outlet stationary blades. Its length is selected according to the target cutting length, and its longitudinal position is adjusted via the guide groove pressure plate and the third waist hole. During adjustment, first release the pressure of the guide groove pressure plate, then move the transition guide groove along the wire conveying direction to adjust the distance between the wire guide channel inlet and outlet and the stationary blades on both sides. After completion, the guide groove pressure plate is tightened again. The large end diameter of the flared opening is limited to within 1.3mm to reduce jamming caused by two 0.70mm diameter wires entering the inlet side-by-side; the small ends are set at 0.75mm and 0.80mm respectively to correspond to the two wire diameters. Thus, the transition guide groove simultaneously serves as the guide, guide, and intermediate support, and adapts to different cutting lengths and wire diameter combinations.

[0028] 7. A single pressure plate synchronous drive simplifies motion transmission: The pressure plate spans above the two moving blades. When the cylinder output end moves downward, the pressure plate synchronously transmits the same driving force to both moving blades. Compared to structures with two independent drive components, the single pressure plate reduces the problem of asynchronous movement between the two moving blades caused by differences in drive response time, air pressure fluctuations, or stroke settings. After the cylinder returns, the pressure plate releases its downward pressure, and the two reset springs push the corresponding moving blades back to their reset positions, thus separating the driving and reset actions. This structure reduces the complex rigid connection between the moving blades and the cylinder, making the disassembly, maintenance, and reset inspection of the blade assembly more direct, and facilitating the formation of repetitive feeding, cutting, reset, and unloading cycles when used with an automatic feeding mechanism.

[0029] It should be understood that all combinations of the foregoing concepts and the additional concepts described in more detail below can be considered part of the inventive subject matter of this disclosure, provided that such concepts do not contradict each other.

[0030] The foregoing and other aspects, embodiments, and features of the teachings of the present invention will be more fully understood from the following description in conjunction with the accompanying drawings. Other additional aspects of the invention, such as features and / or beneficial effects of exemplary embodiments, will become apparent from the following description or may be learned through practice of specific embodiments according to the teachings of the present invention. Attached Figure Description

[0031] The accompanying drawings are not drawn to scale. In the drawings, each identical or nearly identical component shown in the various figures may be denoted by the same reference numeral. For clarity, not every component is labeled in each figure. Embodiments of various aspects of the invention will now be described by way of example and with reference to the accompanying drawings, wherein:

[0032] Figure 1 This is a schematic diagram of the structure of a cutting tool for a fixed-length cutting machine according to an embodiment of this application.

[0033] Figure 2 This is an exploded view of the structure of a cutting tool for a fixed-length cutting machine according to an embodiment of this application.

[0034] Explanation of icon numbers:

[0035] 1. Pressure plate; 2. Moving blade; 3. Inlet stationary blade; 4. Reset spring; 5. Lower base plate; 6. Mounting base plate; 7. Transition guide groove; 8. Guide groove clamping element; 9. Outlet stationary blade; 10. Tool holder. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by those skilled in the art to which this invention pertains.

[0037] The terms "first," "second," and similar words used in the specification and claims of this patent application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, unless the context clearly indicates otherwise, the singular forms of "an," "a," or "the," etc., do not indicate a quantity limitation, but rather indicate the presence of at least one. Terms such as "comprising" or "including" mean that the element or object preceding "comprising" encompasses the features, integrals, steps, operations, elements, and / or components listed following "comprising" or "including," and do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or collections thereof. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described object changes.

[0038] Existing small-diameter wire cutting equipment mostly uses a single moving blade in conjunction with a fixed blade to complete the cutting. The wire lacks continuous guidance and stable constraint near the cutting position. When the moving blade applies unilateral shearing force, the flexible wire is prone to bending, springing back, or axial movement, resulting in slanted cuts, end deformation, and fluctuations in cutting length. When switching between different target lengths or different wire diameters, some equipment requires replacing the entire blade and guide components or reassembling the cutting assembly. Inconsistent adjustment benchmarks and cumbersome hole alignment and cutting position calibration make it difficult to balance processing accuracy, changeover efficiency, and continuous operation stability.

[0039] Therefore, embodiments of the present invention provide a cutting tool for a fixed-length cutting machine, referring to... Figure 1 and Figure 2 It includes a mounting base plate 6, two lower base plates 5, two tool holders 10, two moving blades 2, an inlet stationary blade 3, an outlet stationary blade 9, a transition guide groove 7, a guide groove pressure piece 8, a pressure plate 1, and two reset springs 4.

[0040] Two lower base plates 5 are installed at intervals on the mounting base plate 6 along the wire conveying direction, and two tool holders 10 are fixed to the two lower base plates 5 respectively; along the wire conveying direction, the two tool holders 10 are the first tool holder and the second tool holder respectively, and the two moving blades 2 are the first moving blade and the second moving blade respectively.

[0041] The first moving blade, the inlet stationary blade 3, the outlet stationary blade 9, and the second moving blade are each provided with cutting holes; when the two moving blades 2 are in the reset position, the four cutting holes in the same position are coaxially arranged along the wire conveying direction.

[0042] The transition guide groove 7 is located between the inlet stationary blade 3 and the outlet stationary blade 9. The transition guide groove 7 has a wire guide channel that runs through the wire conveying direction. The inlet of the wire guide channel is coaxial with the selected cutting hole in the inlet stationary blade 3, and the outlet of the wire guide channel is coaxial with the selected cutting hole in the outlet stationary blade 9. The guide groove clamping member 8 presses and positions the transition guide groove 7 between the two tool holders 10 by fastening bolts.

[0043] The pressure plate 1 spans above the two moving blades 2. The lower surface of the pressure plate 1 is positioned opposite to the upper ends of the two moving blades 2. When the pressure plate 1 moves downward, it simultaneously abuts against and pushes the two moving blades 2 downward.

[0044] Two reset springs 4 are respectively disposed between the corresponding moving blade 2 and the blade holder 10; when the pressure plate 1 pushes the two moving blades 2 downward, the cutting hole of the first moving blade is offset downward relative to the cutting hole of the inlet stationary blade 3, and the cutting hole of the second moving blade is offset downward relative to the cutting hole of the outlet stationary blade 9, so as to form a shearing action between the first moving blade and the inlet stationary blade 3 and between the outlet stationary blade 9 and the second moving blade respectively; after the pressure plate 1 moves upward and releases the downward pressure on the two moving blades 2, the two reset springs 4 respectively push the corresponding moving blades 2 back to the reset position.

[0045] The reset position refers to the position where the moving blade 2 moves upward to the limit position under the elastic force of the reset spring 4, and the selected cutting hole on the moving blade 2 is coaxial with the selected cutting hole on the adjacent stationary blade. The cutting position refers to the position where the moving blade 2 moves downward under the action of the pressure plate 1, causing the selected cutting hole on the moving blade 2 to be radially misaligned with the selected cutting hole on the adjacent stationary blade. The first shearing plane is formed between the adjacent surfaces of the first moving blade and the inlet stationary blade 3, and the second shearing plane is formed between the adjacent surfaces of the outlet stationary blade 9 and the second moving blade. The distance between the first shearing plane and the second shearing plane along the wire conveying direction constitutes the cutting length of the wire.

[0046] The mounting base plate 6 serves as the unified mounting foundation for the cutting tool assembly. Two lower base plates 5 are spaced apart on the mounting base plate 6 along the wire feeding direction, and a first cutter holder and a second cutter holder are respectively mounted on the two lower base plates 5. The first cutter holder contains a first moving blade and an inlet stationary blade 3, while the second cutter holder contains an outlet stationary blade 9 and a second moving blade, allowing the wire to pass sequentially through the first moving blade, the inlet stationary blade 3, the transition guide groove 7, the outlet stationary blade 9, and the second moving blade along the feeding direction. Both moving blades 2 slide vertically, while the inlet stationary blade 3 and the outlet stationary blade 9 remain fixed. The pressure plate 1 spans above the two moving blades 2 and applies downward pressure to both moving blades 2 simultaneously during its downward movement, thereby synchronously completing the cutting of both ends of the wire at two spaced-apart shearing positions.

[0047] Instead of relying solely on a single shearing position and feeding stop position to determine the wire length, two shearing positions with a fixed distance are set within the same tool assembly, and the two moving blades 2 are synchronously driven by the same pressure plate 1. A first shearing plane is formed between the first moving blade and the inlet stationary blade 3, and a second shearing plane is formed between the outlet stationary blade 9 and the second moving blade. The distance between the two shearing planes constitutes a fixed length reference. A transition guide groove 7 is set between the two shearing positions, ensuring that the low-stiffness wire is continuously guided within the area forming the fixed length segment. This structure integrates length limitation, wire guidance, and double-end shearing into a single tool assembly. The two moving blades 2 move synchronously under the action of the same pressure plate 1, and the two shearing actions are completed within the same work cycle, reducing length errors caused by continued displacement of the feeding mechanism, wire springback, and repositioning during multiple cutting processes. The length of the wire segment is limited by the physical distance between the two shearing planes, ensuring a stable cutting reference. The inlet stationary blade 3, the outlet stationary blade 9, and the transition guide groove 7 also provide continuous support for the filament between the two shearing positions, reducing the lateral displacement and end warping of the flexible filament under shearing force, which helps to improve the flatness of the cut and the consistency of continuous cutting.

[0048] In some embodiments, the moving blade 2 includes a blade body extending in the vertical direction and a transverse shoulder disposed on the upper part of the blade body to form a T-shaped structure; the blade holder 10 is provided with a T-shaped groove extending in the vertical direction and adapted to the moving blade 2, the T-shaped groove including a guide portion for sliding of the blade body and a limiting surface cooperating with the transverse shoulder; one end of the reset spring 4 abuts against the lower end of the moving blade 2, and the other end is supported on the blade holder 10; when the reset spring 4 pushes the moving blade 2 upward to the point where the transverse shoulder abuts against the limiting surface, the moving blade 2 is in the reset position, and the cutting hole of the moving blade 2 is coaxial with the cutting hole in the adjacent stationary blade that is in the same hole position.

[0049] The moving blade 2 adopts a T-shaped structure, with its blade body extending vertically and a transverse shoulder at the top. A T-shaped groove adapted to the shape of the moving blade 2 is formed in the tool holder 10. The T-shaped groove includes a guide portion extending vertically and a limiting surface for restricting the upward movement of the moving blade 2. The moving blade 2 is embedded in the T-shaped groove and slides vertically along the guide portion. A reset spring 4 is disposed between the lower end of the moving blade 2 and the tool holder 10. After the pressure plate 1 releases the downward pressure on the moving blade 2, the reset spring 4 pushes the moving blade 2 upward until the transverse shoulder abuts against the limiting surface. At this point, the moving blade 2 returns to its reset position, and the cutting hole of the moving blade 2 becomes coaxial with the cutting hole of the adjacent stationary blade.

[0050] The combination of T-shaped sliding guide, elastic reset, and solid limiting mechanism restricts the freedom of the moving blade 2 in the transverse and wire feeding directions, causing it to move primarily in the vertical direction. The reset spring 4 provides a continuous upward force, and the contact between the transverse shoulder and the limiting surface determines the final reset height. The reset position is determined by the solid structure between the tool holder 10 and the moving blade 2, independent of the cylinder's return accuracy and the spring's free length, thus forming a repeatable hole alignment reference.

[0051] The T-shaped groove constrains the movement direction of the moving blade 2, reducing lateral swaying or rotation around the axis after multiple cuts. The reset spring 4 promptly pushes the moving blade 2 back to its original position after the pressure plate 1 moves upward, reopening the feeding channel. After the lateral shoulder abuts against the limiting surface, the moving blade 2 stops at the same height each time, ensuring the cutting hole remains coaxial with the adjacent stationary blade's cutting hole. Therefore, subsequent wire is less likely to impact the hole wall due to fluctuations in the moving blade 2's reset height, and the impact of cutting hole misalignment on feeding resistance and cut position is reduced.

[0052] In some embodiments, the first moving blade, the inlet stationary blade 3, the outlet stationary blade 9, and the second moving blade are each provided with six cutting holes laterally distributed along the horizontal plane perpendicular to the wire conveying direction. The six cutting holes on each blade have the same hole position distribution. The six cutting holes include a first hole group and a second hole group, each of which includes three cutting holes. The diameter of each cutting hole in the first hole group is 0.8 mm, used for threading wire with a diameter of 0.7 mm. The diameter of each cutting hole in the second hole group is 0.85 mm, used for threading wire with a diameter of 0.75 mm. The center distance between two adjacent cutting holes in the same hole group is 3 mm. When the two moving blades 2 are in the reset position, the four cutting holes at the same hole position on each blade are coaxially arranged along the wire conveying direction.

[0053] Each blade has six cutting holes machined with the same hole dimensions. When the mounting base 6 is adjusted laterally, the four cutting holes in the same lateral position coincide with the wire feeding path. The first group of holes corresponds to wire with a diameter of 0.7 mm, and the second group of holes corresponds to wire with a diameter of 0.75 mm. The 3 mm spacing between adjacent cutting holes in the same group refers to the distance between the axes of two adjacent cutting holes.

[0054] The first moving blade, the inlet stationary blade 3, the outlet stationary blade 9, and the second moving blade each have six identically distributed cutting holes. These six cutting holes are distributed laterally and divided into a first group and a second group, with each group containing three cutting holes. The center-to-center distance between adjacent cutting holes within the same group is 3 mm. The cutting holes in the first group have a diameter of 0.8 mm and are used for threading wires with a diameter of 0.7 mm; the cutting holes in the second group have a diameter of 0.85 mm and are used for threading wires with a diameter of 0.75 mm. When all blades are in the installed state and both moving blades 2 are in the reset position, the cutting holes on the four blades located at the same transverse position are coaxial along the wire feeding direction.

[0055] Two aperture sizes and multiple repeating working positions are simultaneously set on the same set of blades, combining wire specification adaptation and cutting hole life allocation. Different aperture sizes correspond to wires of different diameters, ensuring smooth wire passage while limiting lateral sway of the wire. Each aperture size has three working positions. When one position wears due to long-term shearing, it can be switched to another position in the same set by laterally moving the mounting base 6, without immediately replacing the entire set of moving blades 2 and stationary blades. The four blades use the same aperture distribution, maintaining a complete straight feeding path after changing apertures.

[0056] Designing corresponding cutting holes for different wire diameters prevents the wire from wobbling within the hole due to excessively large holes, and also avoids increased feeding resistance due to excessively small holes. Multiple working holes of the same diameter disperse the shearing working area of ​​the blades, reducing localized wear caused by long-term shearing friction at a single hole. If the cutting edge condition at a certain hole deteriorates, the same set of blades can be used again by laterally switching holes, reducing downtime for replacements. The coaxial alignment of the corresponding holes on the four blades also ensures a consistent guiding reference for the wire at the entry, transition, and exit positions.

[0057] In some embodiments, the first moving blade, the second moving blade, the inlet stationary blade 3, and the outlet stationary blade 9 are all made of Cr12MoV material with a hardness of HRC 58~63; the two lower base plates 5 and the two tool holders 10 are all made of Cr12 material with a hardness of HRC 55~60.

[0058] The moving blade 2 and the stationary blade, as components that directly form the shearing edge, are made of Cr12MoV material and heat-treated to achieve HRC 58~63. The lower base plate 5 and the tool holder 10, as components for mounting, guiding, and supporting the blades, are made of Cr12 material and heat-treated to achieve HRC 55~60. Different components use corresponding materials and hardness ranges to meet the working requirements of cutting edge shearing, sliding guidance, and structural support.

[0059] The moving blade 2 and the stationary blade bear the contact, friction, and cyclic shear loads during the cutting process, and are made of Cr12MoV material with a corresponding hardness range. Using Cr12MoV material and achieving the specified hardness for the moving blade 2 and the stationary blade helps maintain the shape of the cutting hole edge and the state of the shearing edge, reducing the occurrence of blade rolling, collapse, or hole enlargement during continuous cutting. In addition to bearing the load, the blade holder 10 also forms a sliding fit with the moving blade 2, and the lower base plate 5 needs to bear the functions of fastening and position adjustment; therefore, it is made of Cr12 material with a corresponding hardness range. The use of Cr12 material and a corresponding hardness for the blade holder 10 and the lower base plate 5 meets the requirements for blade installation, sliding guidance, and fastening load bearing. The separate material and hardness range for each component avoids using the same material as the cutting edge for non-shearing components and helps control blade wear, guiding fit, and overall structural stability.

[0060] In some embodiments, each lower base plate 5 is provided with at least one first waist hole extending along the wire conveying direction. The length of the first waist hole is 26mm. An M5 hexagon socket bolt passes through the first waist hole and is connected to the mounting base plate 6. When the M5 hexagon socket bolt is in the loose state, the two lower base plates 5 slide relative to the mounting base plate 6 along the wire conveying direction. After the M5 hexagon socket bolt is tightened, the two lower base plates 5 are fixed in the adjustment position, so that the distance between the first shearing plane and the second shearing plane is 52mm~104mm.

[0061] The two lower base plates 5 are adjusted along the wire feeding direction via the first waist holes. During adjustment, the first shearing plane formed between the first moving blade and the inlet stationary blade 3, and the second shearing plane formed between the outlet stationary blade 9 and the second moving blade are used as measurement references. A length measuring tool is used to measure the distance between the two shearing planes. Each of the two first waist holes provides an adjustment stroke of 26mm. By adjusting the relative position of the two lower base plates 5, the distance between the two shearing planes is adjusted to cover 52mm~104mm. After adjustment, the M5 socket head cap bolts are tightened, and then a test cut and length verification are performed.

[0062] Two lower base plates 5 are each provided with a first waist hole extending along the wire conveying direction, with a length of 26mm. M5 hexagon socket bolts pass through the first waist holes and connect to the mounting base plate 6. After loosening the M5 hexagon socket bolts, the two lower base plates 5 move along the wire conveying direction, causing a change in the relative position between the first and second cutter holders. During adjustment, the first shearing plane between the first moving blade and the inlet stationary blade 3, and the second shearing plane between the outlet stationary blade 9 and the second moving blade, are used as length measurement references. After adjustment and tightening the bolts, the distance between the two shearing planes remains at the set value.

[0063] The cutting length adjustment is set at the two lower base plates 5 of the supporting blade holder 10, rather than compensating for the blade size separately by changing the feeding program. Each of the two lower base plates 5 has a longitudinal adjustment stroke of 26mm, and their relative movement allows the distance between the two shearing planes to range from 52mm to 104mm. The adjustment targets two complete blade holder assemblies 10, therefore the original shearing fit between the moving blade 2 and its corresponding stationary blade will not change due to length adjustment. The length adjustment and blade shearing gap adjustment are separated, which helps avoid recalibrating the relative shearing positions of the moving blade 2 and the stationary blade when changing the target length.

[0064] The distance between the two shearing planes can be adjusted by moving the two lower base plates 5, allowing the same tool structure to adapt to multiple target lengths. The adjustment process uses the first waist hole as a guide, and the direction of movement is consistent with the wire feeding direction, reducing the lateral offset of the tool holder 10. Each of the two tool holders 10 maintains the assembly relationship between the moving blade 2 and the stationary blade, so it is not necessary to disassemble the shearing pair when adjusting the length. Using the shearing plane as the measurement reference can also avoid measurement errors caused by differences in blade thickness, tool holder 10 dimensions, or installation gaps, which helps to improve the accuracy and repeatability of length setting.

[0065] In some embodiments, the mounting base plate 6 is provided with at least one second waist hole extending laterally in the horizontal plane perpendicular to the wire conveying direction. The length of the second waist hole is 16mm. An M5 hexagon socket bolt passes through the second waist hole and is connected to the equipment base plate of the fixed-length cutting machine. When the M5 hexagon socket bolt is in the loose state, the mounting base plate 6 slides laterally relative to the equipment base plate. After the M5 hexagon socket bolt is tightened, the axis of the four cutting holes on each blade at the same hole position coincides with the wire conveying path.

[0066] When changing holes laterally, first loosen the M5 hex socket bolts inserted in the second waist hole, then guide the template wire into the desired cutting hole along the feeding direction, and move the mounting base plate 6 laterally. When the template wire passes sequentially through the corresponding cutting holes on the first moving blade, the inlet stationary blade 3, the outlet stationary blade 9, and the second moving blade, and there is no obvious lateral bending of the template wire within each cutting hole, tighten the M5 hex socket bolts. The 16mm length of the second waist hole provides adjustment stroke for lateral switching between the six cutting holes.

[0067] The mounting base plate 6 has a second slotted hole extending laterally, with a length of 16mm. An M5 hex bolt passes through this second slotted hole and connects to the equipment base plate. After loosening the bolt, the mounting base plate 6, along with the two lower base plates 5, the two cutter holders 10, and all the blades, moves laterally as a whole, causing the different lateral holes to move sequentially to the wire feeding path. During adjustment, a sample wire is fed into the selected cutting hole, and the mounting base plate 6 is moved until the sample wire passes through the corresponding cutting holes on the four blades sequentially without significant lateral bending. The bolt is then tightened to ensure the selected hole position coincides with the feeding path.

[0068] The hole position switching is completed by moving the mounting base plate 6 laterally as a whole, and the relative positions of the four blades remain unchanged during the hole switching process. Compared with moving individual blades separately, the overall adjustment avoids the problem of calibrating each of the four cutting holes individually. The extension direction of the second waist hole is perpendicular to the wire feeding direction, so that the mounting base plate 6 only changes the hole position selection without changing the longitudinal distance between the two shearing planes. The longitudinal length adjustment and the lateral hole position adjustment are handled by different waist holes, and the two adjustment functions are independent of each other in terms of direction and target.

[0069] After the mounting base plate 6 is moved laterally as a whole, the first moving blade, the inlet stationary blade 3, the outlet stationary blade 9, and the second moving blade are simultaneously moved to the same lateral hole position, reducing the inconsistency of hole axes caused by single-blade adjustments. Using a template wire through the four cutting holes for centering directly reflects the actual feeding path, reducing errors caused by calibration based solely on external dimensions. Lateral adjustment is suitable for switching hole diameters between 0.7mm and 0.75mm wires, as well as switching between different working hole positions within the same hole group, thereby shortening downtime required for specification conversion and hole position maintenance.

[0070] In some embodiments, the guide groove clamping member 8 is disposed above the transition guide groove 7. The guide groove clamping member 8 is provided with at least one third waist hole extending along the wire conveying direction. The fastening bolt passes through the third waist hole and is connected to the corresponding tool holder 10. When the fastening bolt is in the loose state, the guide groove clamping member 8 releases the clamping of the transition guide groove 7, and the transition guide groove 7 is adjusted along the wire conveying direction. After the guide groove clamping member 8 is adjusted to the clamping position along the third waist hole and the fastening bolt is locked, the guide groove clamping member 8 clamps and fixes the transition guide groove 7 between the inlet stationary blade 3 and the outlet stationary blade 9.

[0071] The lower part of the transition guide 7 is supported on the support area formed by the corresponding lower base plate 5, and the guide trough clamping member 8 is located above the transition guide 7. The fastening bolt passes through the third waist hole and is connected to the lower base plate 5. After loosening the fastening bolt, the guide trough clamping member 8 is released from clamping, and the transition guide 7 moves along the wire conveying direction, so that the inlet and outlet of the wire guide channel are close to the inlet stationary blade 3 and the outlet stationary blade 9, respectively. After the adjustment is completed, the guide trough clamping member 8 is moved to the clamping position and the fastening bolt is tightened.

[0072] The transition guide 7 is positioned between the inlet stationary blade 3 and the outlet stationary blade 9, with the guide plate 1 located above it. The guide plate 1 has a third slot extending along the wire feeding direction, through which fastening bolts pass and connect to the corresponding lower base plate 5. After loosening the fastening bolts, the guide plate 1 releases its pressure on the transition guide 7, allowing it to move along the wire feeding direction to adjust the positions of the wire guide channel inlet and outlet relative to the stationary blades on both sides. After adjustment, the guide plate 1 is moved to a suitable pressing position, and the fastening bolts are tightened to fix the transition guide 7 between the two blade holders 10.

[0073] The transition guide groove 7 is configured as an independently adjustable and clamping component, ensuring that its length and position are adapted to the longitudinal distance between the two cutter holders 10. The third waist hole allows the clamping position of the guide groove pressure plate 1 to change with the position of the transition guide groove 7, thereby avoiding the limitation of the adjustment range of the transition guide groove 7 by using a pressure plate 1 with a fixed hole position. The transition guide groove 7 and the guide groove pressure plate 1 are clamped and fixed, facilitating the replacement of transition guide grooves 7 of different lengths according to the target cutting length. The longitudinal cutter holder 10 adjustment, the selection of the transition guide groove 7, and the position adjustment of the guide groove pressure plate 1 together form a length adaptation structure.

[0074] After the transition guide 7 is positioned, its inlet and outlet can be positioned close to the inlet stationary blade 3 and outlet stationary blade 9, respectively, reducing the unsupported distance between the stationary blade and the transition guide 7. The guide plate 1 changes its clamping position through the third waist hole, ensuring stable fixation of transition guides 7 of different lengths. The clamping method facilitates the disassembly and replacement of the transition guide 7 and also helps to recalibrate the wire guide channel after length adjustment. By reducing the suspended section of wire between the two shearing positions, the occurrence of sagging, arching, or deviation from the cutting hole axis of the flexible wire during feeding can be reduced.

[0075] In some embodiments, the transition guide groove 7 is provided with a guide channel for the filament to pass through. The inlet section of the guide channel is a flared mouth that gradually narrows along the filament conveying direction. The larger end of the flared mouth is located on the feeding side, and the diameter of the larger end is larger than the diameter of the smaller end of the flared mouth but not greater than 1.3 mm. The smaller end of the flared mouth is located on the discharge side. When the cutter is used to cut filament with a diameter of 0.70 mm, the diameter of the smaller end is 0.75 mm. When the cutter is used to cut filament with a diameter of 0.75 mm, the diameter of the smaller end is 0.80 mm.

[0076] The diameter of the larger end of the bell mouth is no greater than 1.3mm, ensuring that the opening at the larger end is smaller than the width required for two 0.70mm diameter wires to pass side-by-side, thus reducing the possibility of two wires entering the inlet simultaneously and getting stuck. The bell mouth continuously narrows from the larger end to the smaller end, gradually guiding wires that deviate from the axis of the wire guide channel. The diameter of the smaller end is configured according to the wire diameter, maintaining a feeding gap between the wire and the wire guide channel.

[0077] A through-flow wire guide channel is provided in the transition guide trough 7. The inlet section of the wire guide channel forms a bell mouth that gradually narrows along the wire conveying direction. The larger end of the bell mouth is located on the feed side, with a diameter larger than the smaller end but not exceeding 1.3 mm; the smaller end is located on the discharge side. When using wire with a diameter of 0.70 mm, the smaller end diameter is set to 0.75 mm; when using wire with a diameter of 0.75 mm, the smaller end diameter is set to 0.80 mm. After entering from the larger end, the wire gradually approaches the axis of the smaller end under the guidance of the continuously narrowing channel wall, and then enters the cutting hole of the outlet stationary blade 9 along the smaller end. Because the wire is straightened, and the cutting hole and the wire guide channel are on the same horizontal line, both the transition guide trough 7 and the outlet stationary blade 9 are guided by the bell mouth. The transition guide trough 7 does not need to be tightly fitted with the inlet stationary blade 3 or the outlet stationary blade 9. As long as the distance between the inlet stationary blade 3 and the outlet stationary blade 9 is controlled within 15 mm, the wire can pass through normally without obstruction.

[0078] By limiting the size of the large end of the bell mouth and setting separate small end sizes adapted to the two types of filaments, a balance is achieved between the feed range and the limitation on single filaments. The large end provides a wider inlet range than the small end to receive filament ends with slight deviations; the diameter of the large end is limited to within 1.3mm to reduce the possibility of two filaments with a diameter of 0.70mm entering side by side. The diameter of the small end is larger than the diameter of the corresponding filament, allowing for a feeding gap in the filaments while limiting large lateral oscillations at the outlet, thus balancing the requirements of feed, guidance, and prevention of double filament jamming.

[0079] The larger end of the flared opening facilitates the entry of the wire tip into the guide channel, reducing the probability of the wire tip directly impacting the edge of the small-diameter channel entrance and bending. The gradually narrowing inner wall provides continuous guidance for the wire, allowing it to gradually align with the axis of the cutting hole before approaching the exit stationary blade 9. The large-end diameter limitation reduces blockage caused by simultaneous entry of two wires, while the small-end size configuration helps maintain the feeding gap and exit positioning accuracy. This structure provides a relatively smooth guiding process for small-diameter wires with high elasticity and low stiffness, which helps improve the feeding stability of the intermediate transition section.

[0080] In some embodiments, the pressure plate 1 is connected to the cylinder output end of the fixed-length cutting machine; when the cylinder output end moves downward, the pressure plate 1 simultaneously pushes the two moving blades 2 from the reset position to the cutting position; when the cylinder output end returns and drives the pressure plate 1 to move upward, the pressure plate 1 releases the downward pressure on the two moving blades 2, and the two reset springs 4 respectively push the corresponding moving blades 2 back to the reset position.

[0081] The downward movement of the cylinder output end is simultaneously transmitted to the two moving blades 2 via the pressure plate 1, so that the two shearing actions are completed in the same drive stroke. After the cylinder returns, the pressure plate 1 leaves the pressure position of the moving blade 2, and the two return springs 4 apply an upward return force to the corresponding moving blade 2. The pressure plate 1 does not bear the upward pull-back return action of the moving blade 2; the return of the moving blade 2 is completed by the corresponding return spring 4.

[0082] The pressure plate 1 is connected to the output end of the cylinder of the fixed-length cutting machine and spans the first and second moving blades. When the cylinder output end moves downward, the lower surface of the pressure plate 1 abuts against the upper ends of the two moving blades 2, and synchronously transmits the downward pressure of the cylinder to the two moving blades 2, causing them to move from the reset position to the cutting position. When the cylinder output end returns, the pressure plate 1 moves upward and releases the downward pressure on the two moving blades 2. The two reset springs 4 push the corresponding moving blades 2 upward until the moving blades 2 reach the reset position defined by the T-shaped groove limiting surface.

[0083] A single cylinder and a transverse pressure plate 1 drive two moving blades 2, unifying the driving actions of the two shear pairs within the same force transmission path. The two moving blades 2 are not equipped with independent cylinders, thus reducing differences in response time, stroke, and output force between independent driving components. The pressure plate 1 is only responsible for downward pushing; the upward reset of the moving blades 2 is accomplished by corresponding reset springs 4, allowing for different actuators for driving and reset. This action relationship maintains synchronous downward pressing of the two moving blades 2 while ensuring that each moving blade 2 independently resets after the pressure plate 1 is released.

[0084] The same cylinder synchronously pushes two moving blades 2 through the same pressure plate 1, which helps to ensure that the two shearing actions occur at similar times, reducing wire pulling, bending, and length changes caused by asynchronous actions of the two independent drive components. The pressure plate 1 simultaneously bears and distributes the driving force, making the pneumatic control circuit and mechanical transmission relationship more concentrated. After the cylinder returns, the two return springs 4 push the moving blades 2 to reset, so even if there is a slight difference in the sliding resistance of the two moving blades 2, each moving blade 2 is still subjected to the corresponding reset force. This structure is suitable for use with automatic feeding programs to form a continuous cycle.

[0085] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the invention. Therefore, the scope of protection of the present invention shall be determined by the claims.

Claims

1. A cutting tool for a fixed-length cutting machine, characterized in that, It includes a mounting base plate, two lower base plates, two tool holders, two moving blades, an inlet stationary blade, an outlet stationary blade, a transition guide groove, a guide groove clamping component, a pressure plate, and two reset springs; Two lower base plates are installed at intervals on the mounting base plate along the wire conveying direction, and two tool holders are respectively fixed to the two lower base plates; along the wire conveying direction, the two tool holders are respectively a first tool holder and a second tool holder, and the two moving blades are respectively a first moving blade and a second moving blade. The first moving blade, the inlet stationary blade, the outlet stationary blade, and the second moving blade are each provided with a cutting hole; when the two moving blades are in the reset position, the four cutting holes in the same position are coaxially arranged along the wire conveying direction; The transition guide groove is disposed between the inlet stationary blade and the outlet stationary blade. The transition guide groove has a wire guide channel that extends along the wire conveying direction. The inlet of the wire guide channel is coaxial with a selected cutting hole in the inlet stationary blade, and the outlet of the wire guide channel is coaxial with a selected cutting hole in the outlet stationary blade. The guide groove clamping member presses and positions the transition guide groove between the two blade holders by fastening bolts. The pressure plate spans over the two moving blades, and the lower surface of the pressure plate is respectively positioned opposite to the upper ends of the two moving blades. When the pressure plate moves downward, it simultaneously abuts against and pushes the two moving blades downward. Two reset springs are respectively disposed between the corresponding moving blade and the blade holder; when the pressure plate pushes the two moving blades downward, the cutting hole of the first moving blade is offset downward relative to the cutting hole of the inlet stationary blade, and the cutting hole of the second moving blade is offset downward relative to the cutting hole of the outlet stationary blade, so as to form a shearing action between the first moving blade and the inlet stationary blade and between the outlet stationary blade and the second moving blade respectively; after the pressure plate moves upward and releases the downward pressure on the two moving blades, the two reset springs respectively push the corresponding moving blades back to the reset position.

2. A cutting tool for a fixed-length cutting machine according to claim 1, characterized in that, The moving blade includes a blade body extending in the vertical direction and a transverse shoulder disposed on the upper part of the blade body to form a T-shaped structure; the tool holder has a T-shaped groove extending in the vertical direction and adapted to the moving blade, the T-shaped groove includes a guide portion for sliding of the blade body and a limiting surface that cooperates with the transverse shoulder; one end of the reset spring abuts against the lower end of the moving blade, and the other end is supported on the tool holder; when the reset spring pushes the moving blade upward until the transverse shoulder abuts against the limiting surface, the moving blade is in the reset position, and the cutting hole of the moving blade is coaxial with the cutting hole in the adjacent stationary blade that is in the same position.

3. A cutting tool for a fixed-length cutting machine according to claim 1, characterized in that, The first moving blade, the inlet stationary blade, the outlet stationary blade, and the second moving blade are each provided with six cutting holes laterally distributed along the horizontal plane perpendicular to the wire conveying direction. The six cutting holes on each blade have the same hole position distribution. The six cutting holes include a first hole group and a second hole group, and the first hole group and the second hole group each include three cutting holes. The diameter of each cutting hole in the first hole group is 0.8 mm, used for threading wire with a diameter of 0.7 mm. The diameter of each cutting hole in the second hole group is 0.85 mm, used for threading wire with a diameter of 0.75 mm. The center distance between two adjacent cutting holes in the same hole group is 3 mm. When the two moving blades are in the reset position, the four cutting holes at the same hole position on each blade are coaxially arranged along the wire conveying direction.

4. A cutting tool for a fixed-length cutting machine according to claim 1, characterized in that, The first moving blade, the second moving blade, the inlet stationary blade, and the outlet stationary blade are all made of Cr12MoV material with a hardness of HRC 58~63; the two lower base plates and the two tool holders are all made of Cr12 material with a hardness of HRC 55~60.

5. A cutting tool for a fixed-length cutting machine according to claim 1, characterized in that, Each of the lower base plates is provided with at least one first waist hole extending along the wire conveying direction. The length of the first waist hole is 26mm. An M5 hexagon socket bolt passes through the first waist hole and is connected to the mounting base plate. When the M5 hexagon socket bolt is in the loose state, the two lower base plates slide relative to the mounting base plate along the wire conveying direction. After the M5 hexagon socket bolt is tightened, the two lower base plates are fixed in the adjustment position, so that the distance between the first shearing plane and the second shearing plane is 52mm~104mm.

6. A cutting tool for a fixed-length cutting machine according to claim 3, characterized in that, The mounting base plate is provided with at least one second waist hole extending laterally in the horizontal plane perpendicular to the wire conveying direction. The length of the second waist hole is 16mm. An M5 hexagon socket bolt passes through the second waist hole and is connected to the equipment base plate of the fixed-length cutting machine. When the M5 hexagon socket bolt is in the loose state, the mounting base plate slides relative to the equipment base plate in the lateral direction. After the M5 hexagon socket bolt is tightened, the axis of the four cutting holes on each blade at the same position coincides with the wire conveying path.

7. A cutting tool for a fixed-length cutting machine according to claim 1, characterized in that, The guide groove clamping member is disposed above the transition guide groove. The guide groove clamping member has at least one third waist hole extending along the wire conveying direction. The fastening bolt passes through the third waist hole and is connected to the corresponding tool holder. When the fastening bolt is in the loose state, the guide groove clamping member releases the clamping of the transition guide groove, and the transition guide groove is adjusted along the wire conveying direction. After the guide groove clamping member is adjusted to the clamping position along the third waist hole and the fastening bolt is locked, the guide groove clamping member presses and fixes the transition guide groove between the inlet stationary blade and the outlet stationary blade.

8. A cutting tool for a fixed-length cutting machine according to claim 7, characterized in that, The transition guide groove is provided with a guide channel for the filament to pass through. The inlet section of the guide channel is a funnel-shaped opening that gradually narrows along the filament conveying direction. The larger end of the funnel-shaped opening is located on the feeding side, and the diameter of the larger end is larger than the diameter of the smaller end of the funnel-shaped opening but not greater than 1.3 mm. The smaller end of the funnel-shaped opening is located on the discharge side. When the cutter is used to cut filament with a diameter of 0.70 mm, the diameter of the smaller end is 0.75 mm. When the cutter is used to cut filament with a diameter of 0.75 mm, the diameter of the smaller end is 0.80 mm.

9. A cutting tool for a fixed-length cutting machine according to claim 1, characterized in that, The pressure plate is connected to the cylinder output end of the fixed-length cutting machine; when the cylinder output end moves downward, the pressure plate simultaneously pushes the two moving blades from the reset position to the cutting position; when the cylinder output end returns and drives the pressure plate to move upward, the pressure plate releases the downward pressure on the two moving blades, and the two reset springs push the corresponding moving blades back to the reset position.

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