Precise shifting and feeding structure

Abstract

The application discloses a precise shifting and feeding structure, which comprises a feeding pipe, a swinging long shaft and a clamping mechanism, the feeding pipe is used for conveying workpieces; the swinging long shaft is driven to rotate by a driving mechanism, so that the swinging long shaft reciprocates within a certain angle range; the clamping mechanism comprises a clamping front plate and a clamping back plate, the clamping back plate is fixedly connected to the bottom end of the swinging long shaft, the clamping front plate is rotatably connected to the bottom end of the swinging long shaft, the clamping mechanism further comprises a spring, the spring is used for abutting against one side of the clamping front plate away from the clamping back plate, so that the clamping front plate and the clamping back plate clamp the workpieces conveyed by the feeding pipe; through the cooperation of the swinging long shaft, the clamping front plate, the clamping back plate, a material supporting plate, a second limiting rod, a limiting block, a fixing rod and the spring, the clamping mechanism can be self-adaptively opened and closed in the process of receiving the workpieces conveyed by the feeding pipe and putting the workpieces into a material cylinder, the workpieces can be conveniently transferred into the material cylinder one by one, and the operation convenience is remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of workpiece feeding technology, specifically a precision shifting feeding structure. Background Technology

[0002] In the production of precision hardware parts, pneumatic vibratory feeders are used to arrange workpieces (brass, stainless steel, steel, and aluminum, etc.) in an orderly manner for feeding into automated assembly or machining centers. This allows the automated assembly equipment to assemble the various parts of the product into a complete unit, or the automated machining center to process the workpieces. However, the process of conveying workpieces using pneumatic vibratory feeders is uncontrollable; it cannot guarantee that workpieces will be delivered to the automated assembly or machining center one by one, and multiple workpieces may be conveyed at once. Furthermore, to improve production efficiency, automated assembly or machining machines typically have multiple stations, usually driven by a rotating mechanism. However, vibratory feeders cannot connect to the stations of rotating automated assembly or machining centers. Summary of the Invention

[0003] The purpose of this invention is to improve and innovate upon the shortcomings and problems existing in the prior art, and to provide a precision shifting and feeding structure.

[0004] A precision shifting and feeding structure, comprising:

[0005] The feed pipe is used to convey materials;

[0006] A swing axis, which is driven to rotate by a drive mechanism, so that the swing axis reciprocates within a certain angle range;

[0007] The clamping mechanism includes a clamping front plate and a clamping back plate. The clamping back plate is fixedly connected to the bottom end of the swing shaft, and the clamping front plate is rotatably connected to the bottom end of the swing shaft. The clamping mechanism also includes a spring, which is used to press against the side of the clamping front plate away from the clamping back plate so that the clamping front plate and the clamping back plate clamp the material conveyed by the feed pipe.

[0008] A barrel fixing platform, on which a barrel is provided;

[0009] The limiting block, when the swing shaft drives the material clamped by the clamping mechanism to move to the top of the material cylinder, the limiting block abuts against the clamping back plate, and the upper surface of the clamping back plate always abuts against the next material extending out of the feed pipe;

[0010] The second limiting rod abuts against the clamping back plate when the swing shaft drives the clamping mechanism to move directly below the feed pipe.

[0011] A further option includes a material support plate, the inner bottom wall of which is used to receive the material conveyed by the feed pipe, and the second limiting rod is installed on the side wall of the material support plate.

[0012] A further embodiment is that a first limiting rod is installed on the clamping plate, and a round pad is installed at one end of the first limiting rod near the clamping back plate. The round pad is used to abut against the side of the clamping back plate near the clamping plate.

[0013] A further option is to provide a limiting groove on the clamping back plate that is compatible with the material.

[0014] A further embodiment includes a material ejection mechanism, which includes a second cylinder. The output end of the second cylinder is provided with a material ejection shaft, and the bottom end of the material ejection shaft is fixedly connected to a material ejection needle. When the swinging shaft drives the material held by the clamping mechanism to move to the top of the material cylinder, the material ejection needle is used to push the material into the material cylinder.

[0015] A further embodiment is that an upper piston and a lower piston are slidably fitted inside the second cylinder, and a soft magnetic ring is provided between the upper piston and the lower piston. The soft magnetic ring corresponds to a magnetic switch. The side of the lower piston away from the soft magnetic ring is connected to the top material long shaft. The outer surface of the top material long shaft is slidably fitted with the top material rod limiting sleeve and the first linear bearing. The top material rod limiting sleeve and the first linear bearing are installed on the feeding main shaft.

[0016] A further solution is to provide limit buffer pads on both the top and bottom walls of the second cylinder's inner cavity.

[0017] A further embodiment is that a second linear bearing and a third linear bearing are fitted at the upper and lower ends of the outer surface of the swing shaft, and a deep groove ball bearing is also fitted at the upper end of the swing shaft. The deep groove ball bearing, the second linear bearing, and the third linear bearing are also installed on the feeding spindle.

[0018] Compared with the prior art, the beneficial effects of the present invention are: (1) The present invention, through the coordinated cooperation of the swing long shaft, clamping plate, clamping back plate, supporting plate, second limiting rod, limiting block, fixing rod and spring, when the clamping mechanism hits the limiting block, the clamping plate and clamping back plate automatically separate from each other under the action of inertia; and when the clamping mechanism hits the second limiting rod, the clamping plate and clamping back plate can also automatically separate from each other under the transmission of impact force, so that the clamping mechanism can adaptively open and close during the process of receiving the feed pipe and putting the material into the cylinder, which makes it convenient for the clamping mechanism to transfer the material into the cylinder one by one, and significantly improves the convenience of operation;

[0019] (2) By setting up a top material mechanism, the present invention can easily push the parts contaminated with metal cutting oil into the barrel, effectively solving the problem that it is difficult to make the parts contaminated with metal cutting oil fall automatically by gravity alone; in addition, the outer surface of the top material long shaft in the top material mechanism slides with the top material rod limiting sleeve and the first linear bearing, and the top material rod limiting sleeve and the first linear bearing play a guiding role, ensuring that the top material long shaft will not be eccentric during the up and down extension process;

[0020] (3) The present invention has a compact overall structure and small size, and is suitable for processing precision hardware parts in multiple fields such as new energy, pen manufacturing, medical and automobiles;

[0021] (4) The precision shifting and feeding structure provided by the present invention has the advantages of quick disassembly and replacement, easy adjustment, stable structure, high precision and low maintenance cost. It can meet the requirements of various shaped raw materials, such as round, square, polygonal, etc.; there are no restrictions on the material of the raw materials, such as brass, stainless steel, steel, aluminum, etc. Attached Figure Description

[0022] Figure 1 A three-dimensional structural diagram of a precision shifting and feeding structure provided in an embodiment of the present invention. Figure 1 ;

[0023] Figure 2 A three-dimensional structural diagram of a precision shifting and feeding structure provided in an embodiment of the present invention. Figure 2 (Excluding the fixed platform and the feeding spindle);

[0024] Figure 3 This is a schematic diagram of the clamping mechanism provided in an embodiment of the present invention. Figure 1 ;

[0025] Figure 4 This is a schematic diagram of the clamping mechanism provided in an embodiment of the present invention. Figure 2 (Excluding sandwich panels);

[0026] Figure 5 This is a schematic diagram of the structure of the material support plate provided in an embodiment of the present invention;

[0027] Figure 6 This is a schematic diagram of the swing shaft and clamping mechanism provided in an embodiment of the present invention;

[0028] Figure 7 This is a schematic diagram of the structure of the feeding spindle and clamping mechanism provided in an embodiment of the present invention;

[0029] Figure 8 This is a three-dimensional structural diagram of the top-feeding mechanism provided in an embodiment of the present invention;

[0030] Figure 9This is a cross-sectional structural diagram of the top-loading mechanism provided in an embodiment of the present invention;

[0031] Figure 10 This is a cross-sectional structural diagram of the cage and feeding spindle provided in an embodiment of the present invention.

[0032] Reference numerals: 1. Fixed platform; 2. Material cylinder fixing table; 3. Material cylinder; 4. Cage; 5. Lateral connector; 6. First cylinder; 7. Second cylinder; 8. Feeding spindle; 9. Fine-tuning rod; 10. Feed pipe; 11. Material support plate; 12. Clamping mechanism; 121. Clamping front plate; 122. Clamping back plate; 123. Fixing rod; 124. Spring; 125. Locking nut; 126. First limiting rod; 127. Round washer; 128. Second limiting rod; 129. Limiting groove; 13. Limiting stop; 14. Swinging long shaft; 15. Ejector rod limiting sleeve; 16. Ejector long shaft; 17. Ejector fine needle; 18. Cylinder cover plate; 19. Limiting buffer pad; 20. Upper piston; 21. Lower piston; 22. Soft magnetic ring; 23. First linear bearing; 24. Second linear bearing; 25. Deep groove ball bearing; 26. Inner bushing; 27. Third linear bearing; 28. Material; 29. ​​Straight tooth push-pull rod; 30. Swinging straight tooth. Detailed Implementation

[0033] To make the objectives, 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.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0035] Please see Figures 1-2 This invention provides a precision shifting and feeding structure, including a fixed platform 1 and a cylinder fixing table 2. A plurality of cylinders 3 are mounted on the cylinder fixing table 2; however, only one cylinder 3 is shown in the figure. The cylinder fixing table 2 can rotate relative to the fixed platform 1, allowing the cylinders 3 to rotate sequentially to a position directly below the fixed platform 1. The mechanism driving the rotation of the cylinder fixing table 2 is not shown in the figure. Specifically, the cylinder fixing table 2 can be mounted on a slewing bearing, and a motor drives a gear to rotate. The gear meshes with the teeth on the outer surface of the slewing bearing, thereby driving the slewing bearing to rotate. A fine-tuning rod 9 is mounted on the upper surface of the fixed platform 1, and a retainer 4 is mounted on the upper end of the fine-tuning rod 9. A feeding spindle 8 is mounted on the retainer 4, and the bottom end of the feeding spindle 8 passes through the fixed platform 1 and extends directly above the cylinders 3.

[0036] Please see Figure 1 and Figure 7 The cage 4 is also equipped with a feed pipe 10. The upper end of the feed pipe 10 is connected to the pneumatic vibrating plate. The pneumatic vibrating plate is used to orderly transport the material 28 into the feed pipe 10. The material 28 can be any one of brass, stainless steel, steel and aluminum. The bottom end of the feed pipe 10 extends to the bottom end of the feeding spindle 8.

[0037] Further, please refer to Figures 1-5 A first cylinder 6 is mounted on one side of the retainer 4 via a transverse connector 5. A spur tooth push-pull rod 29 is fixedly connected to the output end of the first cylinder 6. The first cylinder 6 drives the spur tooth push-pull rod 29 to reciprocate. The spur tooth push-pull rod 29 is engaged with a swinging spur tooth 30, which is mounted on the upper end of the swinging long shaft 14. When the output end of the first cylinder 6 extends or retracts, it drives the swinging spur tooth 30 to reciprocate within a certain angle range, thereby driving the swinging long shaft 14 to reciprocate within a certain angle range. A clamping mechanism 12 is provided at the bottom end of the swing shaft 14. Specifically, the clamping mechanism 12 includes a clamping front plate 121 and a clamping back plate 122. The clamping back plate 122 is fixedly connected to the bottom end of the swing shaft 14, and the clamping front plate 121 is rotatably connected to the bottom end of the swing shaft 14 through a sleeve. The clamping mechanism 12 also includes a fixing rod 123, which is installed on the clamping back plate 122 and extends through the clamping front plate 121 to the clamping back plate. On the side away from the clamping back plate 122, a spring 124 and two washers are fitted on the fixing rod 123. The two ends of the spring 124 abut against the washers. A locking nut 125 is also threaded onto the fixing rod 123. The spring 124 is in a slightly compressed state, so that the washers at both ends of the spring 124 abut against the clamping plate 121 and the locking nut 125 respectively, thereby enabling the clamping back plate 122 and the clamping plate 121 to clamp the material 28 conveyed by the feed pipe 10.

[0038] Preferably, please refer to Figure 6 The upper and lower ends of the outer surface of the swing shaft 14 are fitted with a second linear bearing 24 and a third linear bearing 27. The upper outer surface of the swing shaft 14 is also rotatably connected to a deep groove ball bearing 25 by a sleeve 26. The deep groove ball bearing 25, the second linear bearing 24 and the third linear bearing 27 are mounted on the feeding spindle 8.

[0039] Please continue reading Figures 1-5The bottom end of the feeding spindle 8 is provided with a material support plate 11 and a limiting block 13; specifically, the material support plate 11 is directly installed at the bottom end of the feeding spindle 8, a second limiting rod 128 is installed on the side wall of the material support plate 11, and the limiting block 13 is installed at the bottom end of the feeding spindle 8 through a fixing block. When the first cylinder 6 extends, it drives the swing shaft 14 to rotate toward the limiting block 13, causing the clamping plate 121 and the clamping back plate 122 to rotate together toward the limiting block 13 until the edge of the clamping back plate 122, which extends beyond the clamping plate 121, collides with the limiting block 13. At this time, the material 28 held by the clamping mechanism 12 is located directly above the material cylinder 3. Under the action of inertia, the clamping plate 121 rotates relative to the swing shaft 14 and compresses the spring 124, causing the clamping plate 121 and the clamping back plate 122 to separate from each other. The clamping plate 121 and the clamping back plate 122 no longer hold the material 28. At this time, the material 28 can automatically fall downward into the material cylinder 3. When the first cylinder 6 retracts, it drives the swing shaft 14 to rotate toward the second limit rod 128, causing the clamping plate 121 and the clamping back plate 122 to rotate together toward the second limit rod 128 until the back of the clamping back plate 122 collides with the second limit rod 128. The impact force is transmitted to the clamping plate 121, causing it to compress the spring 124, thus separating the clamping plate 121 and the clamping back plate 122. This allows the bottom of the next material piece 28 to fall from the upper surface of the clamping back plate 122 between the clamping plate 121 and the clamping back plate 122. Then, the spring 124 immediately returns to its original position, clamping the fallen material piece 28. This allows the clamping mechanism 12 to transfer the material pieces 28 to the material cylinder 3 one by one. At the same time, the material cylinder fixing platform 2 can also rotate relative to the fixing platform 1, making it convenient for each material cylinder 3 to receive materials in sequence.

[0040] It should be noted that during the process of the clamping mechanism 12 transferring the material 28 to the top of the material cylinder 3, the bottom end of the next material 28 extends out of the feed pipe 10 and falls onto the upper surface of the clamping back plate 122, so that it will not fall and can be clamped by the clamping mechanism 12 after it rotates back.

[0041] Preferably, such as Figure 4 As shown, a first limiting rod 126 is installed on the clamping plate 121. A round pad 127 is installed at one end of the first limiting rod 126 near the clamping back plate 122. The round pad 127 is used to abut against the side of the clamping back plate 122 near the clamping plate 121. During the clamping process of the clamping mechanism 12 clamping the workpiece 28, after the round pad 127 abuts against the clamping back plate 122, it can prevent the clamping plate 121 from getting too close to the clamping back plate 122 and damaging the brass or other workpieces 28.

[0042] Optionally, the clamping back plate 122 is provided with a limiting groove 129 adapted to the material 28. The limiting groove 129 is used to accommodate the falling material 28 and to guide it.

[0043] It should be noted that during the production and processing, the material 28 is usually contaminated with metal cutting oil. This makes it difficult for the material 28 to fall automatically under gravity alone after the clamping plate 121 separates from the clamping back plate 122. Therefore, the present invention provides a top-loading mechanism, such as... Figures 8-10 As shown, the ejector mechanism includes a second cylinder 7, which is mounted on a retainer 4. The output end of the second cylinder 7 is provided with an ejector shaft 16, and the bottom end of the ejector shaft 16 is fixedly connected to an ejector needle 17 adapted to the material 28. When the swing shaft 14 drives the material 28 held by the clamping mechanism 12 to move directly above the material cylinder 3, as described above, under the action of inertia, the clamping plate 121 rotates relative to the swing shaft 14, causing the clamping plate 121 and the clamping back plate 122 to separate from each other. At this time, the second cylinder 7 drives the ejector needle 17 to act on the top of the material 28, thereby pushing the material 28 into the material cylinder 3.

[0044] Optionally, a cylinder cover plate 18 is detachably connected to the top wall of the second cylinder 7. An upper piston 20 and a lower piston 21 are slidably fitted inside the second cylinder 7. A soft magnetic ring 22 is disposed between the upper piston 20 and the lower piston 21. The soft magnetic ring 22 corresponds to a magnetic switch (not shown in the diagram). Through the interaction between the soft magnetic ring 22 and the magnetic switch, the movement position of the upper piston 20 and the lower piston 21 can be sensed, thereby facilitating the control of the vertical extension and retraction displacement of the top material shaft 16. The side of the lower piston 21 away from the soft magnetic ring 22 is connected to the top material shaft 16. The outer surface of the top material shaft 16 is slidably fitted with the top material rod limiting sleeve 15 and the first linear bearing 23. The top material rod limiting sleeve 15 and the first linear bearing 23 are mounted on the feeding main shaft 8. The top material rod limiting sleeve 15 and the first linear bearing 23 serve as guides, ensuring that the vertical extension and retraction of the top material shaft 16 is not eccentric.

[0045] Preferably, the top and bottom walls of the inner cavity of the second cylinder 7 are provided with limiting buffer pads 19, which serve to limit the upper piston 20 and the lower piston 21 vertically.

[0046] The working principle of this invention is as follows: In specific use, the material 28 is conveyed into the feed pipe 10 by a pneumatic vibrating disc. Under the guidance of the feed pipe 10, the material 28 falls onto the support plate 11 and is held by the clamping mechanism 12. At this time, the first material 28 falls out completely, and the bottom end of the next material 28 extends out of the feed pipe 10. Then, the first cylinder 6 extends, driving the clamping mechanism 12 to rotate toward the limiting block 13 until the edge of the clamping back plate 122 collides with the limiting block 13. At this time, the material 28 held by the clamping mechanism 12 is exactly above the material cylinder 3. Under the action of inertia, the clamping plate 121 rotates relative to the swing axis 14 and compresses the spring 124, causing the clamping plate 121 and the clamping back plate 122 to separate from each other. The clamping plate 121 and the clamping back plate 122 no longer hold the material 28. At the same time, the second cylinder 7 drives... The moving ejector pin 17 acts on the top of the material part 28, thereby pushing the material part 28 into the material cylinder 3; then the first cylinder 6 retracts, driving the clamping mechanism 12 to rotate in the opposite direction until the back of the clamping back plate 122 collides with the second limit rod 128. The impact force is transmitted to the clamping front plate 121, causing the clamping front plate 121 to also compress the spring 124, thereby causing the clamping front plate 121 and the clamping back plate 122 to separate, so that the bottom end of the next material part 28 can fall from the upper surface of the clamping back plate 122 into the space between the clamping front plate 121 and the clamping back plate 122. Then the spring 124 immediately returns to its original position, clamping the fallen material part 28, thereby realizing the adaptive opening and closing of the clamping mechanism 12, which facilitates the clamping mechanism 12 to transfer the material part 28 to the material cylinder 3 one by one; at the same time, the material cylinder fixing platform 2 can also rotate relative to the fixing platform 1, so that each material cylinder 3 can receive materials in sequence.

[0047] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.

[0048] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0049] Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. The reference to "embodiment" herein means that a specific feature, structure, or characteristic described in connection with an embodiment can be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily indicate the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application. Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A precision shifting and feeding structure, characterized in that, include: Feed pipe (10), the feed pipe (10) is used to convey material (28); The swing axis (14) is driven to rotate by a drive mechanism so that the swing axis (14) reciprocates within a certain angle range; The clamping mechanism (12) includes a clamping front plate (121) and a clamping back plate (122). The clamping back plate (122) is fixedly connected to the bottom end of the swing shaft (14), and the clamping front plate (121) is rotatably connected to the bottom end of the swing shaft (14). The clamping mechanism (12) also includes a spring (124), which is used to press against the side of the clamping front plate (121) away from the clamping back plate (122) so that the clamping front plate (121) and the clamping back plate (122) clamp the material (28) conveyed by the feed pipe (10). A barrel fixing platform (2) is provided with a barrel (3); When the swing shaft (14) drives the clamping mechanism (12) to move the material (28) held by the limiting block (13) to the top of the material cylinder (3), the limiting block (13) abuts against the clamping back plate (122), and the upper surface of the clamping back plate (122) always abuts against the next material (28) extending out of the feed pipe (10). When the swing shaft (14) drives the clamping mechanism (12) to move directly below the feed pipe (10), the second limiting rod (128) abuts against the clamping back plate (122). The material ejection mechanism includes a second cylinder (7), the output end of which is provided with a material ejection shaft (16), and the bottom end of the material ejection shaft (16) is fixedly connected with a material ejection needle (17); when the swing shaft (14) drives the material clamping mechanism (12) to move the material (28) held by it to the top of the material cylinder (3), the material ejection needle (17) is used to push the material (28) into the material cylinder (3).

2. The precision shifting and feeding structure according to claim 1, characterized in that: It also includes a material support plate (11), the inner bottom wall of which is used to receive the material (28) conveyed by the feed pipe (10), and the second limiting rod (128) is installed on the side wall of the material support plate (11).

3. The precision shifting and feeding structure according to claim 1, characterized in that: A first limiting rod (126) is installed on the clamping plate (121). A round pad (127) is installed on one end of the first limiting rod (126) near the clamping back plate (122). The round pad (127) is used to abut against the side of the clamping back plate (122) near the clamping plate (121).

4. The precision shifting and feeding structure according to claim 1, characterized in that: The clamping back plate (122) is provided with a limiting groove (129) that is compatible with the material (28).

5. The precision shifting and feeding structure according to claim 1, characterized in that: The second cylinder (7) has an upper piston (20) and a lower piston (21) that slide together. A soft magnetic ring (22) is provided between the upper piston (20) and the lower piston (21). The soft magnetic ring (22) corresponds to a magnetic switch. The side of the lower piston (21) away from the soft magnetic ring (22) is connected to the top material long shaft (16). The outer surface of the top material long shaft (16) slides together with the top material rod limiting sleeve (15) and the first linear bearing (23). The top material rod limiting sleeve (15) and the first linear bearing (23) are mounted on the feeding main shaft (8).

6. The precision shifting and feeding structure according to claim 5, characterized in that: The second cylinder (7) has limit buffer pads (19) on both the top and bottom walls of its inner cavity.

7. The precision shifting and feeding structure according to claim 5, characterized in that: The upper and lower ends of the outer surface of the swing shaft (14) are fitted with a second linear bearing (24) and a third linear bearing (27). The upper end of the swing shaft (14) is also fitted with a deep groove ball bearing (25). The deep groove ball bearing (25), the second linear bearing (24) and the third linear bearing (27) are also installed on the feeding spindle (8).

Images