Inner ring fine polishing device for bearing machining

Abstract

The application relates to the technical field of bearing inner ring polishing, in particular to an inner ring fine polishing device for bearing machining, which comprises a feeding frame installed on one side of the machining area of a grinding machine, a temporary storage hole is formed in the outer wall of the feeding frame, a touch pressure ring is inlaid on one side of the end of the temporary storage hole, a push block is slidably connected to the inner wall of the side of the feeding frame away from the touch pressure ring, and the inner wall of the temporary storage hole is provided with an elastic block. A driving motor drives the feeding frame to rotate, the temporary storage hole is sequentially aligned with a feeding hole of a material supplementing table and a three-jaw chuck, automatic feeding is realized, a touch pressure elastic rod, a moving block and a pushing plate cooperate to push workpieces to the temporary storage hole one by one, the limiting block and the elastic block stabilize the workpieces when the feeding frame rotates, the workpieces are fed by the elastic plate driven by the touch pressure ring, the whole process does not need manual intervention, the feeding efficiency and precision are improved, the labor cost is reduced, and the production efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of bearing inner ring grinding technology, and in particular to a bearing inner ring precision grinding device. Background Technology

[0002] During the bearing manufacturing process, after the inner ring undergoes processes such as turning, burrs will remain on the surface. Therefore, a special grinding device is needed to finely grind the inner ring of the bearing to remove burrs and improve surface finish and dimensional accuracy.

[0003] When machining the inner ring of a bearing, the bearing is usually clamped in a three-jaw chuck. During machining, the bearing needs to be placed in the center area of ​​the three-jaw chuck for clamping. After machining, the bearing needs to be removed after the clamping is released. This unloading and loading process requires repeated operation by the worker.

[0004] Manual unloading and loading require human intervention for each individual bearing during grinding, necessitating a worker to monitor the operation of each grinding machine. This increases the production cost of bearing components, and the inconsistent manual operation and slow loading and unloading times negatively impact the processing efficiency of bearings. Summary of the Invention

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0006] In view of the aforementioned problem of requiring manual feeding, this invention is proposed.

[0007] Therefore, the purpose of this invention is to provide a precision grinding device for inner rings in bearing machining.

[0008] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a bearing inner ring precision grinding device, comprising a grinding machine, a three-jaw chuck, and a grinding mechanism, and further comprising... A loading rack is installed on one side of the processing area of ​​the grinding machine, and a drive motor is installed on one side of the loading rack. The drive motor drives the loading rack to rotate and move. A temporary storage hole is opened on the outer wall of the loading rack. A pressure ring is embedded in one side of the end of the temporary storage hole. The embedded end of the pressure ring is connected to a steering transmission belt. A push block is slidably connected to the inner wall of the loading rack away from the pressure ring. The push block is connected to one end of the steering transmission belt. A spring block is provided on the inner wall of the temporary storage hole. The inner wall of the push block is provided with a flip plate through a pin shaft, and a torsion spring is connected between the flip plate and the inner wall of the push block. One end of the steering transmission belt is connected to one end of the flip plate.

[0009] In a preferred embodiment of the bearing machining inner ring precision grinding device of the present invention, when the loading rack rotates to the side of the three-jaw chuck, the pressing ring is pressed by the end of the three-jaw chuck, and the movement of the pressing ring also drives the push block to move to the side of the three-jaw chuck.

[0010] As a preferred embodiment of the bearing inner ring precision grinding device of the present invention, the grinding machine is equipped with a feeding table on the top, the feeding table is located on one side of the rotation path of the loading frame, the bottom of the feeding table is equipped with a pressing spring rod, one end of the pressing spring rod is embedded in the interior of the feeding table, a moving block is movably placed at the embedded end of the pressing spring rod, a pusher plate is connected to the outer wall of the moving block, and a discharge hole is opened at the bottom of the feeding table.

[0011] As a preferred embodiment of the bearing inner ring precision grinding device for bearing processing described in this invention, the bearing workpieces to be inner-circle ground are stacked inside the feeding platform, the pusher plate is located on one side of the bottom workpiece, the pusher plate pushes one workpiece at a time to the side of the discharge hole, when the loading rack rotates and moves to the side of the feeding platform, the temporary storage hole is located directly below the discharge hole, so that the workpiece falling from the discharge hole can enter the temporary storage hole.

[0012] As a preferred embodiment of the bearing machining inner ring precision grinding device of the present invention, a limiting block is embedded in the inner wall of the temporary storage hole, the limiting block has an inclined groove, a pressing rod is installed on one side of the inclined groove, the pressing rod faces the bottom of the feeding table, and a support spring is installed on one side of the outer wall of the limiting block.

[0013] As a preferred embodiment of the bearing machining inner ring precision grinding device of the present invention, the grinding machine is provided with a mating block on the top, a return spring on the inner wall of the mating block, a piston plate on one end of the return spring, a pressing rod on the outer wall of the piston plate, one end of the pressing rod extending to one side of the rotation path of the loading rack, a sealing ring on one side of the outer ring of the three-jaw chuck, an air inflator on the bottom of the mating block, one end of the air inflator connected to the outer wall of the sealing ring, and two sets of sealing bladders on the inner ring of the sealing ring, with multiple connecting ports between the two sets of sealing bladders.

[0014] As a preferred embodiment of the bearing machining inner ring precision grinding device of the present invention, wherein: a valve is provided in the communication port, and after the sealing bladder bulges and the air pressure increases, the valve opens the communication port due to the change in air pressure.

[0015] As a preferred embodiment of the bearing machining inner ring precision grinding device of the present invention, the inner ring of the three-jaw chuck is connected to a fixed ring, a sealing plate is installed on the inner wall of the fixed ring, a connecting pipe is installed at the end of the fixed ring, and the connecting pipe extends to one side of the outer ring of the three-jaw chuck, and a discharge plate is installed on one side of the fixed ring.

[0016] As a preferred embodiment of the bearing machining inner ring precision grinding device of the present invention, the unloading plate is located on the side of the workpiece clamping. When the unloading plate moves, the ground workpiece is pushed out to the outside of the three-jaw chuck, thereby completing the unloading of the three-jaw chuck.

[0017] Beneficial effects The technical solution provided by this invention has the following advantages compared with the known prior art: I. This invention drives the loading rack to rotate via a drive motor, aligning the temporary storage hole with the discharge hole of the replenishment table and the three-jaw chuck in sequence to achieve automatic loading. The contact spring, moving block and pusher plate work together to push the workpieces one by one to the temporary storage hole. The limit block and spring block stabilize the workpiece when the loading rack rotates. After the contact ring is pressed, the telescopic plate pushes the workpiece to load. The whole process does not require manual intervention, improving loading efficiency and accuracy, reducing labor costs and improving production efficiency. 2. Automatic unloading: The piston plate is driven to return to its original position by the reset spring, causing the sealing bladder to inflate and seal the connecting pipe area. The air pressure increases and opens the connecting port. Gas enters the fixed ring and pushes the sealing plate and unloading plate to move, pushing the workpiece out. This process is closely connected with automatic feeding to form a complete automated process, shortening clamping time, improving processing efficiency, and ensuring processing continuity. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of an inner ring precision grinding device for bearing processing.

[0020] Figure 2 This is a schematic diagram of the loading rack of a bearing inner ring precision grinding device.

[0021] Figure 3 for Figure 2 Enlarged view of point A in the image.

[0022] Figure 4 This is a schematic diagram of a feeding platform for a bearing inner ring precision grinding device.

[0023] Figure 5 This is a schematic diagram of the mating block of an inner ring precision grinding device for bearing processing.

[0024] Figure 6 This is a schematic diagram of a pusher block for a bearing inner ring precision grinding device.

[0025] Figure 7 This is a schematic diagram of the flow pipe of a bearing inner ring precision grinding device.

[0026] Reference numerals: 1. Grinding machine; 11. Three-jaw chuck; 12. Grinding mechanism; 2. Loading rack; 21. Drive motor; 22. Temporary storage hole; 23. Contact ring; 24. Steering transmission belt; 25. Push block; 251. Tilting plate; 27. Spring block; 3. Feeding table; 31. Contact spring rod; 32. Moving block; 33. Pushing plate; 34. Discharge hole; 4. Limiting block; 41. Inclined groove; 42. Contact rod; 43. Support spring; 5. Mating block; 51. Return spring; 52. Piston plate; 53. Pressing rod; 54. Inflation pipe; 55. Sealing ring; 56. Sealing bladder; 57. Connecting port; 6. Fixing ring; 61. Sealing plate; 62. Connecting pipe; 63. Unloading plate. Detailed Implementation

[0027] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0028] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0029] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0030] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0031] Example Reference Figures 1-7This embodiment provides a bearing inner ring precision grinding device, including a grinding machine 1, a three-jaw chuck 11, and a grinding mechanism 12. It also includes a loading rack 2 mounted on one side of the processing area of ​​the grinding machine 1, a drive motor 21 mounted on one side of the loading rack 2, the drive motor 21 driving the loading rack 2 to rotate and move, a temporary storage hole 22 formed on the outer wall of the loading rack 2, a pressure ring 23 embedded in one end of the temporary storage hole 22, and a steering transmission belt 24 connected to the embedded end of the pressure ring 23. A push block 25 is slidably connected to the inner wall on the side away from the pressure ring 23, and a spring block 27 is provided on the inner wall of the temporary storage hole 22; a flip plate 251 is provided on the inner wall of the push block 25 through a pin, and a torsion spring is connected between the flip plate 251 and the inner wall of the push block 25; one end of the steering transmission belt 24 is connected to one end of the flip plate 251, and an elastic band is connected between the push block 25 and the inner wall of the feeding rack 2, which can be used for the restoration action of the push block 25, and the torsion spring is also used to restore the tilted flip plate.

[0032] Specifically, when the loading rack 2 rotates to one side of the three-jaw chuck 11, the pressing ring 23 is pressed by the end of the three-jaw chuck 11. The movement of the pressing ring 23 also drives the push block 25 to move to one side of the three-jaw chuck 11. When the loading rack 2 moves upward, the pressing rod 42 touches the inclined groove 41 of the limiting block 4, causing the limiting block 4 to retract, so that the limiting block 4 does not protrude in the temporary storage hole 22 at this time, ensuring that the limiting block 4 does not affect the complete falling of the workpiece into the temporary storage hole 22.

[0033] Furthermore, a feeding platform 3 is installed on the top of the grinding machine 1. The feeding platform 3 is located on one side of the rotation path of the loading frame 2. A pressing spring rod 31 is installed at the bottom of the feeding platform 3. One end of the pressing spring rod 31 is embedded in the interior of the feeding platform 3. A moving block 32 is movably placed at the embedded end of the pressing spring rod 31. A pusher plate 33 is connected to the outer wall of the moving block 32. A discharge hole 34 is opened at the bottom of the feeding platform 3. When the loading frame 2 moves to the side of the feeding platform 3, the outer wall of the loading frame 2 touches the pressing spring rod 31. The pressing spring rod 31 moves to touch the inclined surface of the moving block 32, causing the moving block 32 to move as well. The movement of the moving block 32 drives the pusher plate 33 to move, causing the pusher plate 33 to push the bottom set of bearing workpieces in the feeding platform 3 to move. When the workpiece moves to above the discharge hole 34, the temporary storage hole 22 of the loading frame 2 is also located below the discharge hole 34, causing the workpiece to slide into the temporary storage hole 22.

[0034] Furthermore, the inside of the feeding platform 3 is stacked with bearing workpieces to be ground on the inner circle. The pusher plate 33 is located on one side of the bottom workpiece. The pusher plate 33 pushes one workpiece at a time to the side of the discharge hole 34. When the loading rack 2 rotates and moves to the side of the feeding platform 3, the temporary storage hole 22 is located directly below the discharge hole 34, so that the workpiece falling from the discharge hole 34 can enter the temporary storage hole 22.

[0035] Furthermore, a limiting block 4 is embedded in the inner wall of the temporary storage hole 22. The limiting block 4 has an inclined groove 41. A pressing rod 42 is installed on one side of the inclined groove 41, with the pressing rod 42 facing the bottom of the feeding platform 3. A support spring 43 is installed on the outer wall of one side of the limiting block 4.

[0036] Furthermore, a mating block 5 is installed on the top of the grinding machine 1, a return spring 51 is installed on the inner wall of the mating block 5, a piston plate 52 is installed on one end of the return spring 51, a pressing rod 53 is installed on the outer wall of the piston plate 52, one end of the pressing rod 53 extends to one side of the rotation path of the loading rack 2, a sealing ring 55 is installed on one side of the outer ring of the three-jaw chuck 11, an air inlet pipe 54 is installed at the bottom of the mating block 5, one end of the air inlet pipe 54 is connected to the outer wall of the sealing ring 55, and two sets of sealing bladders 56 are installed on the inner ring of the sealing ring 55, with a space between the two sets of sealing bladders 56. There are multiple sets of connecting ports 57. When the feeding rack 2 is far away from the replenishing platform 3, its return spring 51 will restore the pressing rod 53. The pressing rod 53 drives the piston plate 52 to move. At this time, the movement of the piston plate 52 is an inflation action, which causes the two sets of sealing bladders 56 to bulge first. When the bulging seals the area of ​​the connecting pipe 62, the increase in air pressure causes the valve of the connecting port 57 to open. At this time, the inflation action drives the sealing plate 61 to move within the fixed ring 6, which causes the sealing plate 61 to move the unloading plate 63, thereby unloading the workpiece on one side of the unloading plate 63.

[0037] Furthermore, a valve is provided inside the connecting port 57. After the sealing bladder 56 bulges and the air pressure increases, the valve opens the connecting port 57 due to the change in air pressure.

[0038] Furthermore, the inner ring of the three-jaw chuck 11 is connected to a fixing ring 6, and a sealing plate 61 is installed on the inner wall of the fixing ring 6. A connecting pipe 62 is installed at the end of the fixing ring 6, and the connecting pipe 62 extends to one side of the outer ring of the three-jaw chuck 11. A discharge plate 63 is installed on one side of the fixing ring 6. The two sets of sealing bladders 56 inflate to seal the area of ​​the connecting pipe 62. At this time, the increase in air pressure causes the valve of the connecting port 57 to open. At this time, the inflation action drives the sealing plate 61 to move within the fixing ring 6, causing the sealing plate 61 to move the discharge plate 63, thereby discharging the workpiece on one side of the discharge plate 63.

[0039] Furthermore, the unloading plate 63 is located on the side holding the workpiece. When the unloading plate 63 moves, it pushes the polished workpiece to the outside of the three-jaw chuck 11, thereby completing the unloading of the three-jaw chuck 11.

[0040] Operation process: When the drive motor 21 moves the loading rack 2 to one side of the replenishment platform 3, the pressing rod 53 is squeezed by the outer wall of one side of the loading rack 2, causing the pressing rod 53 to move and drive the piston plate 52 to move. At this time, the return spring 51 is stretched and in a stored state. During the process of the loading rack 2 moving to one side of the replenishment platform 3, the outer wall of the loading rack 2 touches the pressing spring rod 31. The pressing spring rod 31 moves and touches the inclined surface of the moving block 32, causing the moving block 32 to move as well. The movement of the moving block 32 drives the pusher plate 33 to move, causing the pusher plate 33 to push the bottom set of bearing workpieces in the replenishment platform 3 to move. When the workpiece moves to above the discharge hole 34, the temporary storage hole 22 of its loading rack 2 is also located below the discharge hole 34, causing the workpiece to slide into the temporary storage hole 22. When the loading rack 2 moves upward, the pressing rod 42 touches the inclined groove 41 of the limiting block 4, causing the limiting block 4 to retract, so that the limiting block 4 does not protrude into the temporary storage hole 22 at this time, ensuring that the limiting block 4 does not affect the complete falling of the workpiece into the temporary storage hole 22. When the workpiece at the three-jaw chuck 11 is finished and needs to be unloaded and loaded, the drive motor 21 drives the loading rack 2 to rotate and move towards the side of the three-jaw chuck 11. When the loading rack 2 moves away from the replenishment table 3, its limiting block 4 is restored by the support spring 43, so that the workpiece in the temporary storage hole 22 is restricted by the spring block 27 and the limiting block 4. Moreover, the movement of the loading rack 2 causes the pressing rod 53 to no longer be pressed by the loading rack 2. At this time, the return spring 51 restores the piston plate 52. During the restoration of the piston plate 52, the gas in the mating block 5 is subjected to Piston plate 52 presses through inflation tube 54 into sealing ring 55. The inner cavity of sealing ring 55 is directly connected to two sets of sealing bladders 56, causing the sealing bladders 56 to bulge and fit against the outer wall of three-jaw chuck 11. At this time, the connecting tube 62 of three-jaw chuck 11 is also located between the two sets of sealing bladders 56. At this time, the air pressure in sealing ring 55 will increase slightly until the valve in connecting port 57 opens. At this time, the gas enters the interior of fixed ring 6 through connecting port 57 and flow tube. The sealing plate 61 in fixed ring 6 is pushed by the air pressure change to move unloading plate 63. The movement of unloading plate 63 pushes the workpiece that has been ground on one side, so that the workpiece is unloaded on three-jaw chuck 11. As the loading rack 2 rotates, its contact ring 23 finally contacts one end of three-jaw chuck 11, and as... As the loading rack 2 continues to rotate and move, the pressing ring 23 gradually embeds into the interior of the loading rack 2. The embedding and movement of the pressing ring 23 drives the tilting plate 251 to rotate via the steering transmission belt 24, causing the tilting plate 251 to protrude into the temporary storage hole 22. This protruding tilting plate 251 contacts one end of the bearing workpiece, so that when the steering transmission belt 24 subsequently moves the push block 25, the tilting plate 251 can push the bearing workpiece to move. Furthermore, when the tilting plate 251 tilts, the end of the tilting plate 251 that was originally located on one side of the push plate is flipped to the opposite side of the push block 25. When the push block 25 moves to the end of its stroke, the tilted tilting plate 251 slightly protrudes from one end of the temporary storage hole 22, allowing the tilting plate 251 to completely push out the bearing workpiece.This completes the transfer of the bearing workpiece from the loading rack 2 to the three-jaw chuck 11. The loading rack 2 then rotates upwards to replenish the workpiece in the temporary storage hole 22, allowing the feeding process to continue cyclically. This structure eliminates the need for manual intervention; only periodic replenishment of the workpiece material on the replenishment table 3 is required, effectively improving processing efficiency.

[0041] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A precision grinding device for inner rings in bearing machining, comprising a grinding machine (1), a three-jaw chuck (11), and a grinding mechanism (12), characterized in that: Also includes, A loading rack (2) is installed on one side of the processing area of ​​the grinding machine (1). A drive motor (21) is installed on one side of the loading rack (2). The drive motor (21) drives the loading rack (2) to rotate and move. A temporary storage hole (22) is opened on the outer wall of the loading rack (2). A pressure ring (23) is embedded in one side of the end of the temporary storage hole (22). The embedded end of the pressure ring (23) is connected to a steering transmission belt (24). A push block (25) is slidably connected to the inner wall of the loading rack (2) away from the pressure ring (23). A spring block (27) is provided on the inner wall of the temporary storage hole (22). The inner wall of the push block (25) is provided with a flip plate (251) through a pin shaft, and a torsion spring is connected between the flip plate (251) and the inner wall of the push block (25). One end of the steering transmission belt (24) is connected to one end of the flip plate (251).

2. The bearing inner ring precision grinding device as described in claim 1, characterized in that: When the feeding rack (2) rotates to the side of the three-jaw chuck (11), the pressing ring (23) is pressed by the end of the three-jaw chuck (11), and the movement of the pressing ring (23) also drives the push block (25) to move to the side of the three-jaw chuck (11).

3. The bearing inner ring precision grinding device as described in claim 2, characterized in that: The top of the grinding machine (1) is equipped with a feeding platform (3), which is located on one side of the rotation path of the loading rack (2). The bottom of the feeding platform (3) is equipped with a pressing spring rod (31), one end of which is embedded in the interior of the feeding platform (3). A moving block (32) is movably placed at the embedded end of the pressing spring rod (31). A pusher plate (33) is connected to the outer wall of the moving block (32). A discharge hole (34) is opened at the bottom of the feeding platform (3).

4. The bearing inner ring precision grinding device as described in claim 3, characterized in that: The inside of the feeding platform (3) is stacked bearing workpieces to be ground on the inner circle. The pusher plate (33) is located on one side of the bottom workpiece. The pusher plate (33) pushes one workpiece at a time to the side of the discharge hole (34). When the loading rack (2) rotates and moves to the side of the feeding platform (3), the temporary storage hole (22) is located directly below the discharge hole (34), so that the workpiece falling from the discharge hole (34) can enter the temporary storage hole (22).

5. The bearing inner ring precision grinding device as described in claim 4, characterized in that: A limiting block (4) is embedded in the inner wall of the temporary storage hole (22). The limiting block (4) has an inclined groove (41). A pressing rod (42) is installed on one side of the inclined groove (41). The pressing rod (42) faces the bottom of the feeding platform (3). A support spring (43) is installed on the outer wall of one side of the limiting block (4).

6. The bearing inner ring precision grinding device as described in claim 5, characterized in that: The grinding machine (1) is equipped with a mating block (5) on its top. A return spring (51) is installed on the inner wall of the mating block (5). A piston plate (52) is installed on one end of the return spring (51). A pressing rod (53) is installed on the outer wall of the piston plate (52). One end of the pressing rod (53) extends to one side of the rotation path of the loading rack (2). A sealing ring (55) is installed on one side of the outer ring of the three-jaw chuck (11). An air inflator (54) is installed at the bottom of the mating block (5). One end of the air inflator (54) is connected to the outer wall of the sealing ring (55). Two sets of sealing bladders (56) are installed on the inner ring of the sealing ring (55). Multiple sets of connecting ports (57) are provided between the two sets of sealing bladders (56).

7. The bearing inner ring precision grinding device as described in claim 6, characterized in that: The connecting port (57) is provided with a valve. After the sealing bladder (56) bulges and the air pressure increases, the valve opens the connecting port (57) due to the change in air pressure.

8. The bearing inner ring precision grinding device as described in claim 7, characterized in that: The inner ring of the three-jaw chuck (11) is connected to a fixing ring (6), a sealing plate (61) is installed on the inner wall of the fixing ring (6), a connecting pipe (62) is installed at the end of the fixing ring (6), and the connecting pipe (62) extends to one side of the outer ring of the three-jaw chuck (11). A discharge plate (63) is installed on one side of the fixing ring (6).

9. The bearing inner ring precision grinding device as described in claim 8, characterized in that: The unloading plate (63) is located on the side holding the workpiece. When the unloading plate (63) moves, the polished workpiece is pushed out to the outside of the three-jaw chuck (11), thereby completing the unloading of the three-jaw chuck (11).

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