A needle shaft grooving device and method

Abstract

This invention provides a needle shaft grooving device and method. The needle shaft grooving device includes a vertical rotating disk, a grooving cutter, and an ejection mechanism. The rotating disk has evenly spaced receiving grooves for receiving the needle shaft and arc-shaped rolling surfaces located between adjacent receiving grooves on its circumferential surface. The grooving cutter is a thick-bladed cutter with a continuous arc-shaped cutting edge facing the circumferential surface of the rotating disk at its front end. A grooving gap exists between the arc-shaped cutting edge and the circumferential surface of the rotating disk. The ejection mechanism ejects the needle shaft from the receiving groove when the rotating disk rotates it to the inlet position of the arc-shaped cutting edge. As the rotating disk rotates, the ejected needle shaft is transferred to the rear arc-shaped rolling surface and driven into the grooving gap. The arc-shaped rolling surface presses and rubs against the needle shaft during the rotation of the rotating disk, causing it to roll forward on the arc-shaped cutting edge and thus chisel out an annular groove. This invention enables the machining of annular grooves on needle shafts with high hardness without damaging the cutting edge of the grooving cutter.

Description

Technical Field

[0001] This invention relates to the pin shaft of a micro motor gear, to processing equipment for the pin shaft, and particularly to a pin shaft grooving equipment and method. Background Technology

[0002] In micro motors, a pin shaft is needed to support the internal micro gears. To ensure the pin shaft is mounted and positioned on the housing and to prevent axial movement, annular grooves are created on the circumferential surfaces at both ends of the pin shaft. Currently, pin shafts used in micro motors include... Figure 1 As shown, depending on the specifications, the diameter of the needle shaft 1 ranges from 1.0 to 3.0 mm, the length ranges from 6.4 to 25.0 mm, the width of the groove 1a typically ranges from 0.05 to 0.5 mm, and the depth typically ranges from 0.01 to 0.2 mm. It is evident that the needle shaft is a tiny, precision part, which makes it quite difficult to machine the annular grooves at both ends of the needle shaft.

[0003] Previously, existing technology used disc milling cutters to machine the grooves at both ends of the needle shaft. For example... Figure 2 As shown, the disc milling cutter has teeth 11 distributed circumferentially along the edge of the disc 10. By rotating the disc 11, annular grooves are machined around the needle shaft using the teeth 11. However, in actual machining, it has been found that disc milling cutters can only machine needle shafts with relatively low hardness. For needle shafts with high hardness, such as stainless steel, the teeth are prone to chipping when machined with disc milling cutters. Therefore, there is currently no grooving equipment or method in the art capable of machining annular grooves on needle shafts with high hardness. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a needle shaft grooving device that can process annular grooves on needle shafts with high hardness, so as to overcome the shortcomings of the prior art.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A pin shaft grooving device, comprising:

[0007] The upright rotating disk has receiving grooves for receiving the needle shaft and arc-shaped rolling surfaces located between adjacent receiving grooves distributed at equal intervals along its circumference.

[0008] The grooving tool is a thick-bladed tool with a continuous arc-shaped cutting edge at the front end facing the circumferential surface of the rotating disk, and a grooving gap between the arc-shaped cutting edge and the circumferential surface of the rotating disk.

[0009] The ejection mechanism ejects the needle shaft from the receiving groove when the rotating disk rotates the needle shaft to the inlet position of the arc-shaped cutting edge;

[0010] As the rotating disk rotates, the ejected needle shaft is transferred to the rear arc rolling surface and driven into the slotted gap. During the rotation of the rotating disk, the arc rolling surface presses and rubs the needle shaft on the arc cutting edge, causing it to roll forward and thus chisel out an annular groove.

[0011] Using the above technical solution, the receiving groove of the vertical rotating disk can bring the needle shaft to the inlet position of the grooving tool, and the ejection mechanism can eject the needle shaft in the receiving groove that has reached the inlet position of the grooving tool and transfer it to the arc rolling surface behind. The arc rolling surface can apply a large compressive force to the needle shaft, and a relatively thick blade with a continuous arc cutting edge is used. The cutting edge can withstand this large compressive force and will not break. Therefore, it is possible to process annular grooves on needle shafts with high hardness, such as stainless steel.

[0012] In a specific embodiment of the present invention, a feed trough is further included, the outlet of which faces and is close to the circumferential surface of the rotating disk. By using the feed trough in conjunction with the vibrating disk, needle shafts can be continuously fed onto the rotating disk, improving the automation level of the equipment and increasing processing efficiency.

[0013] In a specific embodiment of the invention, a buffer mechanism is further included, the buffer mechanism having an elastic element on a circumferential surface facing the rotating disk near the inlet end position of the arc-shaped cutting edge. This added buffer mechanism can prevent the ejected needle shaft from impacting the cutting edge of the grooving tool, protecting the cutting edge from breakage.

[0014] In a specific embodiment of the invention, a blocking member is also included. This blocking member has a circumferential surface that approaches and faces the rotating disk and extends from the feed groove to the blocking arc surface of the elastic member along the rotation direction of the rotating disk. This structure prevents the needle shaft from being thrown out and falling off during the rotation of the rotating disk.

[0015] In a specific embodiment of the present invention, the ejection mechanism includes a top plate with elastic telescopic function disposed at the bottom of each of the receiving grooves and a blocking block disposed next to the rotating disk and at a position relative to the inlet end of the arc-shaped cutting edge for abutting the protrusion of the top plate.

[0016] In a specific embodiment of the present invention, the grooving cutter comprises two pieces, arranged side-by-side at an interval in front of the circumferential surface of the rotating disk, near the inner side of the left and right edges of the circumferential surface. With this structure, annular grooves can be machined simultaneously at both ends of the needle shaft.

[0017] In a specific embodiment of the present invention, a tool adjustment mechanism for adjusting the grooving gap is also included. This tool adjustment mechanism allows for adjustment of the grooving gap, thereby enabling adjustment of the depth and width of the annular groove.

[0018] In a specific embodiment of the present invention, the elastic member includes a movable baffle hinged at its upper end to the lower end of the blocking member and an elastic support connected to the back of the movable baffle. The movable baffle has an arc-shaped stop surface facing the circumferential surface of the rotating disk, and the arc-shaped stop surface is closer to the circumferential surface of the rotating disk than the cutting edge of the grooving tool.

[0019] In addition, the present invention also provides a needle shaft grooving method based on the above-mentioned needle shaft grooving equipment, the process of which is as follows:

[0020] A needle shaft is fed into the feed trough, and the needle shafts in the feed trough fall into the receiving groove of the rotating disk in sequence by the rotation of the rotating disk.

[0021] When the rotating disk rotates one of the receiving grooves to the inlet end position of the arc-shaped cutting edge, the ejection mechanism ejects the needle shaft from the receiving groove;

[0022] As the rotating disk rotates, the ejected needle shaft is transferred to the rear arc rolling surface and driven into the slotted gap. During the rotation of the rotating disk, the arc rolling surface presses and rubs the needle shaft on the arc cutting edge, causing it to roll forward and thus chisel out an annular groove.

[0023] In summary, the present invention enables the creation of grooved annular grooves on high-hardness needle shafts without damaging the cutting edge of the grooving tool. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the needle shaft structure;

[0025] Figure 2 This is a schematic diagram of a disc milling cutter.

[0026] Figure 3 This is a schematic diagram of the pin shaft grooving device of the present invention;

[0027] Figure 4 A schematic diagram of the top plate structure equipped with a return spring;

[0028] Figure 5 This is a partial schematic diagram of the invention located at the top plate position;

[0029] Figure 6 This is a partial schematic diagram of the present invention located at the entrance end of the arc-shaped cutting edge;

[0030] Figure 7 This is a schematic diagram of the grooving tool of the present invention. Detailed Implementation

[0031] like Figure 1As shown, the needle shaft grooving device of the present invention includes a base 100, a rotating disk 200, a grooving cutter 300, a feeding groove 400, an ejection mechanism 500, a cutter adjustment mechanism 600, a blocking member 700, and a buffer mechanism 800.

[0032] The base 100 is equipped with a support frame 101. The rotating disk 200 is vertically mounted on the support frame 101, supported by a rotating shaft 101a. The rotating shaft 101a is driven to rotate by a motor (not shown in the figure), which in turn drives the rotating disk 200 to rotate on the support frame 101. In this invention, the rotating disk 200 is made of a relatively hard material. In this embodiment, the rotating disk 200 is made of bearing steel, which meets the requirements for wear resistance and is also relatively economical.

[0033] A blanking station A and a grooving station B are provided around the circumference of the rotating disk 200. In this embodiment, the blanking station A is located above the circumference of the rotating disk 200, and the grooving station B is located in front of the circumference of the rotating disk 200.

[0034] The rotating disk 200 has axially penetrating receiving grooves 201 evenly spaced along its circumference, with an arc-shaped rolling surface 202 formed between adjacent receiving grooves 201. The width and depth of the receiving grooves 201 can only accommodate one needle shaft. The axial thickness of the rotating disk 200 is slightly less than the length of the needle shaft being processed, by 0.1-0.2 mm.

[0035] A feeding trough 400 is provided at the unloading station A. The trough body of the feeding trough 400 is fixed on the support frame 101 and is located above the rotating disk 200. The main body section 401 of the feeding trough 400 is vertically located above the rotating disk 200, and the discharge port 402 faces and is close to the circumferential surface of the rotating disk 200. The upper end of the feeding trough 400 has an arc-shaped, smoothly transitioned feeding port 403 that communicates with the main body section 401. There is a small gap between the discharge port 402 and the discharge end face 404 of the feeding trough 400 and the circumferential surface of the rotating disk 200. This gap is much smaller than the diameter of the needle shaft. This structure ensures that the rotation of the rotating disk is not affected. In addition, it also ensures that the needle shaft in the feeding trough 400 will not fall into the receiving groove 201 when it has not rotated to below the discharge port. This ensures that as the rotating disk 200 rotates, each receiving groove 201 can receive one needle shaft in sequence.

[0036] The grooving tool 300 is located at grooving station B. Specifically, a tool holder 310 is installed on the base 100 at the position corresponding to grooving station B. The grooving tool 300 is mounted on the tool holder 310.

[0037] Combination Figure 6 and Figure 7As shown, in this embodiment, the grooving tool 300 consists of two blades, spaced apart and side-by-side, located in front of the circumference of the rotating disk 200 and near the inner side of the left and right edges of the circumference. Both blades are thick inserts made of tungsten carbide alloy, with a thickness ranging from 0.6 to 1.0 mm, preferably 0.7 mm in this embodiment. The front end of the grooving tool 300 has a continuous, uninterrupted arc-shaped cutting edge 301 along its width. The cross-sectional shape of the arc-shaped cutting edge 301 is an isosceles trapezoid. The length of the cutting edge must ensure that the needle shaft can roll at least one revolution on the cutting edge. Therefore, the cutting edge length is typically 2-4 times the circumference of the needle shaft being processed. For example, when processing a needle shaft with a diameter of 1.0-1.5 mm, the cutting edge length can be 14 mm. This grooving tool 300 has high strength and the cutting edge is not easily damaged even under high pressure, enabling grooving on materials with high hardness. By using two grooving tools spaced side-by-side, annular grooves can be processed simultaneously at both ends of the needle shaft in one operation. The arc-shaped cutting edge 301 faces the circumferential surface of the rotating disk 200 and forms a slotted gap 302 between the circumferential surface and the disk.

[0038] Similarly, in order to ensure that the arc rolling surface 202 can always press the needle shaft to roll on the arc cutting edge of the grooving tool 300 during the grooving process, the arc length of the arc rolling surface 202 should not be less than the length of the arc cutting edge 301, and should be slightly longer than the length of the arc cutting edge 301, preferably 1 / 7 to 1 / 6 longer than the length of the arc cutting edge 301.

[0039] As shown in the figure Figures 4 to 6 As shown, the ejection mechanism 500 includes a top plate 510 with elastic telescopic function located at the bottom of each receiving groove 201 and a blocking block 520 located next to the rotating disk 200 corresponding to the entrance end of the arc-shaped cutting edge 301 for abutting the extension of the top plate 501.

[0040] Specifically, the top plate 510 is integrally formed by three parts: a protruding plate 511, an intermediate plate 512, and a contact block 513. The protruding plate 511 and the intermediate plate 512 are of equal thickness. The contact block 513 protrudes from the intermediate plate 512 on both the front and rear sides to form steps 514 on both the front and rear sides of the root of the intermediate plate. The intermediate plate 512 and the contact block 513 are of equal width and both protrude from the protruding plate 511 from the left and right sides (consistent with the axis of the rotating disk) to form shoulders 515 on the left and right sides of the upper end of the intermediate plate 512.

[0041] Additionally, the rotating disk 200 has cavities 230 axially penetrating the rotating disk 200 located inside each receiving groove 201. A through hole 231, which connects the receiving groove 201 and the cavity 230 and is adapted to the shape of the protruding plate 511, is provided between them. Furthermore, the cavity 230 is divided into a narrow cavity portion 232 near the receiving groove 201 and a wide cavity portion 233 away from the receiving groove 201. The protruding plate 511 of the top plate 510 is located in the through hole 231, and the intermediate plate 512 and contact block 513 are located within the cavity 230, with both ends protruding from the left and right end faces of the rotating disk 200. The contact block 513 is located in the wide cavity portion 233, and the upper part of the intermediate plate 512 is located within the narrow cavity portion 232, creating an ejection stroke between the shoulder 515 and the top surface of the narrow cavity portion 232. A spring hole 516 is also provided in the middle of the intermediate plate 512. The top plate 510 also includes a return spring 517 placed in the spring hole 516. The two sides of the return spring 517 protrude from the middle plate 512, such that the upper end of the return spring 517 abuts against the top surface of the wide cavity 233, and the lower end abuts against the step 514, thus giving the top plate 510 an elastic function. Under the action of the return spring 517, in the initial state, the top surface of the protruding plate 511 of the top plate 510 retracts to the bottom of the receiving groove 201.

[0042] There are two blocking blocks 520, symmetrically arranged on the left and right end faces of the rotating disk 200, opposite to the entry end of the arc-shaped cutting edge 301, and located on the travel trajectory of the contact portion 513a at the bottom of the contact block 513. In this embodiment, the blocking block 520 is a circular roller. Specifically, roller brackets 521 are provided on the left and right sides of the rotating disk 200 on the base 100, and the rollers are mounted on the roller brackets 521 through support shafts. In this invention, the blocking block 520 is a circular roller. On one hand, the circumferential surface of the roller has an arc surface that changes from low to high and then from high to low. This allows the roller to contact the contact blocks 513 in each receiving groove 201 as they pass through the roller sequentially. The roller gradually presses the top plate upwards, pushing out the needle shaft located in the receiving groove 201. After passing the highest point, the top plate gradually retracts under the action of the return spring 517, thus realizing the extension and retraction function of the top plate. On the other hand, the roller also rotates during the pressing of the top plate, allowing the contact blocks 513 of the top plate to smoothly pass through the blocking member, ensuring the smooth rotation of the rotating disk 200. To make the contact blocks 513 pass over the roller more smoothly, the corners where the contact blocks 513 first contact the roller are chamfered.

[0043] The tool adjustment mechanism 600 consists of a slide rail 601, a slide block 602, a locking post 603, a locking bolt 604, and a locking nut 605. The slide rail 601 is located below the tool holder 310 and fixed to the base 100. The extension direction of the slide rail 601 is consistent with the extension direction of the grooving tool 300. The slide block 602 is fixed below the tool holder 310 and slidably mounted on the slide rail 601, allowing the grooving tool 300 on the tool holder 310 to slide back and forth. The locking post 603 is fixed to the base 100 and located in front of the slide rail 601. The upper end of the locking post 603 has a through hole. The locking bolt 604 is located in this through hole, and its rear end is fixedly connected to the tool holder 310. There are two locking nuts 605, one sleeved on the locking bolt 604, used to clamp and fix the locking bolt 604 to the locking post 603 from the front and rear of the through hole. When the position of the grooving tool 300 needs to be adjusted, loosen the two locking nuts 605 and manually drive the slide block 602 to slide on the slide rail 601, thereby adjusting the gap between the tool cutting edge and the circumferential surface of the rotating disk 200, i.e., adjusting the grooving gap. After the position of the grooving tool 300 is adjusted, tighten the two locking nuts to clamp and fix the locking bolt 604 on the locking column 603, thereby ensuring that the width of the grooving gap does not change during the grooving process.

[0044] To prevent the needle shaft in the receiving groove 201 from being thrown out during the rotation of the rotating disk 200, a blocking member 700 is provided on the outer side of the circumferential surface of the rotating disk 200 along the rotation direction, located between the blanking station A and the grooving station B. This blocking member 700 has a blocking arc surface 701 that faces and approaches the circumferential surface of the rotating disk 200 and extends circumferentially. The gap between the blocking arc surface 701 and the circumferential surface of the rotating disk 200 should be small enough to prevent the needle shaft from escaping, but should not obstruct the rotation of the rotating disk 200.

[0045] As the rotating disk 200 rotates, when the receiving groove 201 rotates to the inlet end position of the grooving tool 300, the ejection mechanism 500 will eject the needle shaft. However, the suddenly ejected needle shaft will impact the arc-shaped cutting edge of the grooving tool, which may damage the cutting edge. To avoid this situation, a buffer mechanism 800 is also provided at the grooving station B.

[0046] The buffer mechanism 800 has an elastic element 810 located on the circumferential surface facing the rotating disk 200 near the inlet end of the circular arc cutting edge. The elastic element 810 comprises a movable baffle 811 and an elastic support 820 supported on the back of the movable baffle 811. The elastic support 820 includes a support column 821 fixed to the tool holder 310, a rod sleeve 822 fixed to the top of the support column 821, and a push rod 823 and a supporting spring (not shown) disposed within the rod sleeve 822. One end of the rod sleeve 822 is closed, and the other end is open, facing the circumferential surface of the rotating disk 200. The push rod 823 is located within the rod sleeve 822 and extends from the open end of the rod sleeve 822, connecting to the movable baffle 811. One end of the supporting spring within the rod sleeve 822 abuts against the closed end of the rod sleeve, and the other end abuts against the push rod 823. The upper end of the movable baffle 811 is hinged to the lower end of the blocking member 700 (i.e., the end near the grooving tool 300). The movable baffle 811 also has an arc-shaped stop surface 811a facing and approaching the circumferential surface of the rotating disk 200. The lower end of the arc-shaped stop surface 811a is close to the entrance end of the arc-shaped cutting edge and is pressed against the circumferential surface of the rotating disk 200 under the action of the elastic support 820. That is, under the action of the supporting spring, the lower end of the arc-shaped stop surface 811 is closer to the circumferential surface of the rotating disk 200 than the arc-shaped cutting edge 301 of the grooving tool 300. In this way, when the ejector mechanism 500 ejects the needle shaft from the receiving groove 201, the needle shaft will first impact the movable baffle 811. Under the action of the elastic support 820, the movable baffle 811 first provides an elastic resistance to the ejected needle shaft. Then, under the ejection action of the ejector mechanism 500, the needle shaft will come into contact with the arc-shaped cutting edge of the grooving tool 300. This reduces the impact of the ejected needle shaft on the cutting edge of the grooving tool 300, and can prevent the cutting edge of the grooving tool from being damaged, thereby extending the service life of the tool.

[0047] In this invention, the axial length of the rotating disk 200 is slightly shorter than the length of the needle shaft being processed, by 0.1-0.2 mm. By axially aligning the feed groove 400 and the rotating disk 200, the needle shaft, while entering the receiving groove 201 on the arc-shaped rolling surface, has its two ends symmetrically protruding 0.05-0.1 mm from the end face of the rotating disk 200. This ensures that when the needle shaft is rolled by force applied to the arc-shaped rolling surface, the force distributed on the needle shaft and the two cutting edges is balanced, thereby ensuring that the width and depth of the annular grooves processed at both ends of the needle shaft are consistent, thus guaranteeing processing accuracy.

[0048] The base 100 also has a discharge port 102 located below the grooving tool 300. After the needle shaft that has finished processing the annular groove separates from the grooving tool 300 and the rotating disk 200, it falls downward and finally falls into the collection box (not shown in the figure) placed below the discharge port 102.

[0049] The above describes the needle shaft grooving device of the present invention, with the grooving method as follows:

[0050] 1. Connect the outlet of the vibratory feeder to the inlet of the feed trough 400, and use the vibration of the vibratory feeder to feed the needle shafts into the feed trough 400 in sequence;

[0051] 2. The rotating disk 200 is driven by a motor to rotate. During the rotation of the rotating disk 200, the needle shafts located in the feed trough 400 fall into each receiving trough 201 in sequence.

[0052] 3. When one of the receiving grooves 201 drives a needle shaft to rotate to the entrance end of the arc-shaped cutting edge 301 of the grooving tool 300, the top plate in the ejection mechanism 500 slides on the surface of the round roller that serves as the blocking block 520 through the contact part at the inner end. The top plate gradually rises and ejects the needle shaft in the receiving groove 201 outward. During the ejection process, the needle shaft is first blocked by the buffer mechanism 800 and then gradually contacts the entrance end of the arc-shaped cutting edge.

[0053] 4. As the rotating disk 200 continues to rotate, the ejected needle shaft is transferred to the arc-shaped rolling surface 202 behind the receiving groove 201 and driven into the grooving gap. During the rotation of the rotating disk 200, the arc-shaped rolling surface presses and rubs against the needle shaft, causing it to roll forward on the arc-shaped cutting edge 301 until it reaches the exit end of the arc-shaped cutting edge. Finally, it falls out, separating from the grooving tool 300 and the rotating disk 200. This completes the chiseling of an annular groove on the needle shaft. During this process, after the needle shaft enters the grooving gap, the contact block 513 of the top plate in the ejection mechanism 500 passes the highest point of the circular roller as the rotating disk 200 rotates and gradually retracts under the action of the return spring. Once it has completely passed the circular roller, the top surface of the protruding plate of the top plate retracts back to the bottom of the receiving groove 201.

[0054] As can be seen from the above description, the present invention can transfer the needle shaft to the arc rolling surface by rotating the rotating disk. The arc rolling surface can apply a large compressive force to the needle shaft. By using a relatively thick blade with a continuous arc cutting edge, the cutting edge can withstand this large compressive force without breaking. Therefore, it is possible to process annular grooves on needle shafts with high hardness, such as stainless steel.

Claims

1. A needle shaft slitting apparatus characterized by comprising: The application relates to a needle shaft slotting device and a needle shaft slotting method. The device comprises: a vertical rotating disc, the circumferential surface of which is circumferentially and equidistantly provided with receiving grooves for receiving the needle shafts and arc rolling surfaces between adjacent receiving grooves; a slotting cutter, which is a thick piece cutter and has a continuous arc blade edge at the front end, the arc blade edge facing the circumferential surface of the rotating disc and having a slotting gap with the circumferential surface of the rotating disc; an ejection mechanism for ejecting the needle shaft from the receiving groove when the rotating disc rotates the needle shaft to the entrance end position of the arc blade edge; 2. The needle shaft slitting apparatus according to claim 1, characterized by with the rotation of the rotating disc, the ejected needle shaft is transferred to the rear arc rolling surface and enters the slotting gap, and the arc rolling surface presses and rubs the needle shaft to roll on the arc blade edge to cut out a ring-shaped groove.

3. The needle shaft slitting apparatus according to claim 2, characterized by The device further comprises a feeding groove, the discharge port of the feeding groove facing and approaching the circumferential surface of the rotating disc.

4. The needle shaft slitting apparatus according to claim 3, characterized by The device further comprises a buffer mechanism, the buffer mechanism having an elastic piece facing the circumferential surface of the rotating disc and close to the entrance end position of the arc blade edge.

5. The needle shaft slitting apparatus of claim 1, wherein: The device further comprises a blocking piece, the blocking piece having a blocking arc surface close to and facing the circumferential surface of the rotating disc and extending from the feeding groove to the elastic piece along the rotating direction of the rotating disc.

6. The needle shaft slitting apparatus of claim 1, wherein: The ejection mechanism comprises a top plate with elastic expansion function arranged at the bottom of each receiving groove and a blocking block arranged beside the rotating disc and opposite to the position of the entrance end of the arc blade edge.

7. The needle shaft slitting apparatus of claim 1, wherein: The slotting cutter has two pieces and is arranged in parallel and spaced apart in front of the circumferential surface of the rotating disc and close to the inner side of the left and right edges of the circumferential surface.

8. The needle shaft slitting apparatus of claim 4, wherein: The thickness of the slotting cutter is 0.6-1.0 mm, and the length of the arc blade edge is 2-4 times the circumference of the processed needle shaft.

9. The needle shaft slitting apparatus of claim 8, wherein: The elastic piece comprises a movable baffle hinged at the lower end of the blocking piece and an elastic support connected to the back of the movable baffle. The movable baffle has an arc-shaped blocking surface facing the circumferential surface of the rotating disc, and the arc-shaped blocking surface is closer to the circumferential surface of the rotating disc than the blade edge of the slotting cutter.

10. A needle shaft slotting method of the needle shaft slotting device of claim 2, characterized in that: needle shafts are input into the feeding groove, and the needle shafts in the feeding groove are sequentially dropped into the receiving grooves of the rotating disc through the rotation of the rotating disc; when one of the receiving grooves of the rotating disc is rotated to the entrance end position of the arc blade edge, the ejection mechanism ejects the needle shaft in the receiving groove; with the rotation of the rotating disc, the ejected needle shaft is transferred to the rear arc rolling surface and enters the slotting gap, and the arc rolling surface presses and rubs the needle shaft to roll on the arc blade edge to cut out a ring-shaped groove.

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