Split type bulk yarn pressing and chamfering device

Abstract

The application discloses a split type bobbin yarn batch pressing and chamfering device, which comprises a rack, a conveying mechanism, a plurality of lifting mechanisms and two yarn pressing mechanisms; the conveying mechanism comprises a conveying roller, a driving motor and a transmission assembly; the lifting mechanism comprises a Z-axis linear driving device, a lifting plate and a supporting arm; and the yarn pressing mechanism comprises an X-axis linear driving device, a Y-axis linear driving device, a first guide rail, a first Y-axis sliding plate, an X-axis pushing frame, a fixed guide rod and a yarn pressing assembly. The bobbin yarn conveyed by the conveying mechanism is lifted by the plurality of lifting mechanisms, the yarn pressing assemblies of the two yarn pressing mechanisms are controlled to be close to each other, the bobbin yarn is pressed and chamfered, the batch pressing and chamfering operation of the bobbin yarn is realized, and therefore the production efficiency is improved; the chamfering die adopts a split type structure and is formed by splicing, the space required by the yarn pressing mechanism in the vertical and horizontal directions can be reduced, and the split type structure is especially suitable for being applied to a scene with limited space; and the processing time can be reduced and the production efficiency can be improved.

Description

Technical Field

[0001] This invention relates to the field of yarn package processing technology, and in particular to a split-type batch yarn pressing and chamfering device. Background Technology

[0002] During the production of yarn packages, dyeing is required. Uniform yarn density is crucial during dyeing. As the dye liquor circulates and penetrates the yarn layer, it encounters resistance. Higher density areas experience greater resistance, resulting in less dye penetration. Consequently, less dye adheres, and vice versa, leading to color differences, and in severe cases, "white spots." Therefore, uniform density is essential throughout the yarn packages. Besides controlling the loose winding machine's process, this can be mitigated through subsequent yarn pressing and chamfering processes.

[0003] The patent with publication number CN214821106U discloses an inclined rotary yarn cone chamfering forming machine, which uses an intermittent method to feed, chamfer, and unload yarn cones one by one. The waiting period for feeding and unloading is long, the production efficiency is low, and it can only be applied to small spinning mills. It cannot meet the needs of mass production and needs to be improved. Summary of the Invention

[0004] Therefore, it is necessary to provide a split-type batch yarn pressing and chamfering device to address the above-mentioned technical problems.

[0005] To achieve the above objectives, the present invention provides a split-type batch yarn pressing and chamfering device for yarn packages, comprising a frame, a conveying mechanism, a lifting mechanism, and a pressing mechanism;

[0006] The conveying mechanism includes several conveying rollers arranged in a straight line and rotatably mounted on the frame, and a drive motor fixedly mounted on the frame for driving the conveying rollers to rotate.

[0007] The lifting mechanism is configured as multiple and evenly arranged in a straight line. The lifting mechanism includes a Z-axis linear drive device, a lifting plate, and a support arm. The Z-axis linear drive device is fixedly installed on the frame. The lifting plate is fixedly installed on the output end of the Z-axis linear drive device. At least two support arms for lifting the yarn bobbins located on the conveying rollers are installed on the lifting plate. The support arms move up and down in a straight line in the gap between two adjacent conveying rollers.

[0008] The yarn pressing mechanism is symmetrically arranged on both sides of the conveying mechanism. The yarn pressing mechanism includes an X-axis linear drive device, a Y-axis linear drive device, a first guide rail, a first Y-axis sliding plate, an X-axis pusher, a fixed guide rod, and a yarn pressing assembly. The first guide rail and the Y-axis linear drive device are both fixedly mounted on the frame. The first Y-axis sliding plate is fixedly mounted on the slider of the first guide rail. The X-axis linear drive device is fixedly mounted on the first Y-axis sliding plate. The X-axis pusher and the fixed guide rod are fixedly mounted on the first Y-axis sliding plate. The output end of the Y-axis linear drive device is connected to the fixed guide rod, and a... Multiple yarn pressing components; each yarn pressing component includes a guide sleeve, a movable connecting plate, a movable half-beveling mold, a fixed connecting plate, and a fixed half-beveling mold. The guide sleeve is slidably mounted on a fixed guide rod and does not rotate relative to the fixed guide rod. The movable connecting plate and the X-axis pusher are fixedly connected to the guide sleeve. The movable half-beveling mold is fixedly connected to the movable connecting plate. The fixed connecting plate is fixedly mounted on the fixed guide rod. The fixed half-beveling mold is fixedly connected to the fixed connecting plate. The fixed half-beveling mold and the movable half-beveling mold are arranged facing each other. Two fixed half-beveling molds can be assembled into a bowl shape, and two movable half-beveling molds can be assembled into a bowl shape.

[0009] Preferably, the drive motor drives the conveying rollers to rotate through a transmission assembly, which includes a drive pulley, a driven pulley, and a transmission belt. The drive pulley is installed at the output end of the drive motor, and each conveying roller is equipped with a driven pulley. The drive pulley is connected to each driven pulley through the transmission belt.

[0010] Preferably, the lifting mechanism further includes a proximity switch, which is fixedly mounted on the frame and used to detect the position of the yarn package.

[0011] Preferably, the yarn pressing mechanism further includes a second guide rail fixedly installed on the frame and a second Y-axis sliding plate located above the second guide rail, wherein the second Y-axis sliding plate is fixedly connected to the slider of the fixed guide rod and the second guide rail.

[0012] Preferably, the conveying roller is a V-shaped roller.

[0013] Preferably, the support arm includes a lifting portion located at its top, and the top of the lifting portion forms a concave limiting space for restricting the radial movement of the yarn package.

[0014] Preferably, the top of the lifting part is provided with several negative pressure suction ports, and the support arm is provided with an air intake port that communicates with the negative pressure suction ports. The air intake port is connected to a negative pressure source through a negative pressure suction pipe.

[0015] Preferably, a solenoid valve is installed on the negative pressure suction tube.

[0016] Preferably, there are two fixed guide rods, and the guide sleeve is slidably fitted onto the two fixed guide rods.

[0017] Compared with existing technologies, this technical solution has at least one of the following beneficial effects:

[0018] 1. The yarn cones conveyed by the conveying mechanism are supported by multiple lifting mechanisms. By controlling the yarn pressing components of two yarn pressing mechanisms to move closer together, two fixed half-beveling dies are combined to form a bowl-shaped fixed beveling die, and two movable half-beveling dies are combined to form a bowl-shaped movable beveling die. The movable half-beveling die is driven by an X-axis linear drive device to move closer to the yarn cone and push the yarn cone on the lifting part until it contacts the fixed half-beveling die. Finally, the movable beveling die and the fixed beveling die cooperate to contact the two ends of the yarn cone and press and bevele the yarn cone, realizing batch pressing and beveling of the yarn cone, thereby improving production efficiency.

[0019] 2. The chamfering die adopts a split structure and is constructed by splicing. This reduces the space required by the yarn pressing mechanism in the vertical and horizontal directions, making it especially suitable for applications with limited space. After the yarn pressing and chamfering are completed, the movable half-chamfering die and the fixed half-chamfering die are reset, allowing the lifting mechanism to quickly drive the yarn bobbin down onto the conveyor roller. The conveyor roller then outputs the yarn bobbin that has been pressed and chamfered, reducing time consumption and improving production efficiency. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a structure according to an embodiment of the present invention;

[0021] Figure 2 This is a top view of an embodiment of the present invention (omitting the conveying mechanism);

[0022] Figure 3 This is a side sectional view of an embodiment of the present invention;

[0023] Figure 4 for Figure 3 Another state diagram;

[0024] Figure 5 This is a schematic diagram of the support arm structure;

[0025] In the diagram: 1. Frame; 2. Conveying mechanism; 21. Conveying roller; 22. Drive motor; 23. Driving pulley; 24. Driven pulley; 25. Transmission belt; 3. Lifting mechanism; 31. Z-axis linear drive device; 32. Lifting plate; 33. Support arm; 331. Lifting part; 332. Negative pressure suction port; 333. Air suction port; 34. Proximity switch; 35. Negative pressure suction pipe; 36. Negative pressure source; 37. Solenoid valve; 4. Yarn pressing device. Mechanism; 41. X-axis linear drive device; 42. Y-axis linear drive device; 43. First guide rail; 44. First Y-axis sliding plate; 45. X-axis push frame; 46. Fixed guide rod; 47. Yarn pressing assembly; 471. Guide sleeve; 472. Movable connecting plate; 473. Movable half-beveling mold; 474. Fixed connecting plate; 475. Fixed half-beveling mold; 48. Second guide rail; 49. Second Y-axis sliding plate; 5. Yarn cone. Detailed Implementation

[0026] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0027] Please see Figures 1 to 5 This application provides a split-type batch yarn pressing and chamfering device for yarn bobbins, including a frame 1, a conveying mechanism 2, a lifting mechanism 3, and two yarn pressing mechanisms 4;

[0028] The conveying mechanism 2 includes several conveying rollers 21 arranged in a straight line and rotatably mounted on the frame 1, and a drive motor 22 fixedly mounted on the frame 1 for driving the conveying rollers 21 to rotate. The drive motor 22 drives the conveying rollers 21 to rotate through a transmission assembly, which includes a driving pulley 23, a driven pulley 24, and a transmission belt 25. The driving pulley 23 is mounted on the output end of the drive motor 22, and each conveying roller 21 is equipped with a driven pulley 24. The driving pulley 23 is connected to each driven pulley 24 through the transmission belt 25. In a specific embodiment, in order to achieve radial limiting of the yarn package 5, the conveying rollers 21 are set as V-shaped rollers, so that the yarn package 5 can be radially limited by the V-shaped groove formed by the V-shaped roller.

[0029] Multiple lifting mechanisms 3 are arranged in a straight line and are uniformly distributed. Each lifting mechanism 3 includes a Z-axis linear drive device 31, a lifting plate 32, and lifting arms 33. The Z-axis linear drive device 31 is a cylinder; in other embodiments, an electric cylinder or hydraulic cylinder or other device capable of linear drive can also be used. The Z-axis linear drive device 31 is fixedly mounted on the frame 1. The lifting plate 32 is fixedly mounted on the output end of the Z-axis linear drive device 31. At least two lifting arms 33 are mounted on the lifting plate 32 for lifting the yarn package 5 located on the conveying roller 21. The lifting arms 33 move linearly up and down within the gap between two adjacent conveying rollers 21. In one specific embodiment, to ensure that the lifting arms 33 accurately lift the yarn package 5 to a suitable position, the lifting mechanism 3 also includes a proximity switch 34, which is fixedly mounted on the frame 1 and used to detect the position of the yarn package 5. In another specific embodiment, to improve lifting stability and prevent the yarn from falling due to movement on the lifting arms 33, the lifting arms 33 include a lifting part 331 located at their top. The top of part 331 forms a concave limiting space to restrict the radial movement of the yarn package 5; the top of the supporting part 331 is provided with several negative pressure suction ports 332, and the support arm 33 is provided with air intake ports 333 that communicate with the negative pressure suction ports 332. The air intake ports 333 are connected to the negative pressure source 36 through the negative pressure suction pipe 35. The negative pressure source 36 is a vacuum pump, and a solenoid valve 37 is installed on the negative pressure suction pipe 35; when the proximity switch 34 detects the arrival of the yarn package 5 in its corresponding sequence, the solenoid valve 37 automatically opens, and the air intake ports 333 are connected to the negative pressure source 36 through the negative pressure suction pipe 35. The negative pressure suction tube 35 is connected to the negative pressure source 36, which causes the negative pressure suction port 332 to generate negative pressure. The Z-axis linear drive device 31 drives the lifting plate 32 and the support arm 33 to rise. The support arm 33 contacts the bottom of the yarn package 5 on the conveying roller 21 and supports and lifts the yarn package 5 instead of the conveying roller 21, so that the yarn package 5 rises above the conveying roller 21, which is convenient for subsequent yarn pressing and chamfering operations. The negative pressure generated by the negative pressure suction port 332 can firmly adhere to the yarn package 5, ensuring the position of the yarn package 5 and preventing the yarn package 5 from moving significantly due to inertia.

[0030] The yarn pressing mechanism 4 is symmetrically arranged on both sides of the conveying mechanism 2. The yarn pressing mechanism 4 includes an X-axis linear drive device 41, a Y-axis linear drive device 42, a first guide rail 43, a first Y-axis sliding plate 44, an X-axis pusher 45, a fixed guide rod 46, and a yarn pressing assembly 47. The first guide rail 43 and the Y-axis linear drive device 42 are both fixedly mounted on the frame 1. The X-axis linear drive device 41 and the Y-axis linear drive device 42 are cylinders. In other embodiments, electric cylinders or hydraulic cylinders or other devices capable of linear drive can also be used. The first Y-axis sliding plate 44 is fixedly mounted on the slider of the first guide rail 43. The X-axis linear drive device 41 is fixedly mounted on the first Y-axis sliding plate 44. The X-axis pusher 45 and the fixed guide rod 46 are fixedly mounted on the first Y-axis sliding plate 44. The output end of the Y-axis linear drive device 42 is connected to the fixed guide rod 46. Multiple yarn pressing assemblies 47 are mounted on the fixed guide rod 46. The yarn pressing assembly 47 includes a guide sleeve 471, a movable connecting plate 472, a movable semi-chamfering mold 473, and a fixed connecting plate 474. A fixed half-chamfering mold 475 is provided. Two fixed guide rods 46 are provided. A guide sleeve 471 is slidably fitted onto the two fixed guide rods 46, so that the guide sleeve 471 does not rotate relative to the fixed guide rods 46. A movable connecting plate 472 and an X-axis pusher 45 are fixedly connected to the guide sleeve 471. A movable half-chamfering mold 473 is fixedly connected to the movable connecting plate 472. A fixed connecting plate 474 is fixedly installed on the fixed guide rods 46. A fixed half-chamfering mold 475 is fixedly connected to the fixed connecting plate 474. The fixed half-chamfering mold 475 and... The movable half-beveling molds 473 are all the same size, and the fixed half-beveling molds 475 are arranged facing each other. Two fixed half-beveling molds 475 can be combined to form a bowl-shaped fixed beveling mold, and two movable half-beveling molds 473 can be combined to form a bowl-shaped movable beveling mold. The yarn pressing mechanism 4 also includes a second guide rail 48 fixedly installed on the frame 1 and a second Y-axis sliding plate 49 located above the second guide rail 48. The second Y-axis sliding plate 49 is fixedly connected to the fixed guide rod 46 and the slider of the second guide rail 48. The fixed guide rod 46 guides and supports the guide sleeve 471, and supports and fixes the fixed connecting plate 474. This fixes the position of the fixed half-beveling molds 475 on the fixed guide rod 46, allowing the movable half-beveling molds 473 to move linearly along the fixed guide, thus moving closer to or away from each other.

[0031] During operation, the drive motor 22 drives the active pulley 23 to rotate, which in turn drives the transmission belt 25 and the driven pulley 24 to move, which in turn drives each conveying roller 21 to rotate. The yarn 5 moves towards the yarn pressing mechanism 4 under the conveying action of the conveying roller 21.

[0032] When the yarn package 5 moves to the proximity switch 34 of the first lifting mechanism 3 at the far right, the proximity switch 34 detects the right end of the yarn package 5. Subsequently, the solenoid valve 37 automatically opens, and the suction port 333 is connected to the negative pressure source 36 through the negative pressure suction pipe 35, causing the negative pressure suction port 332 to generate negative pressure. The Z-axis linear drive device 31 drives the lifting plate 32 and the support arm 33 to rise. The lifting part 331 of the support arm 33 contacts the bottom of the yarn package 5, adsorbing and lifting the yarn package 5, so that the yarn package 5 rises stably above the conveyor roller 21. When the yarn package 5 moves to the proximity switch 34 of the second lifting mechanism 3 at the far right, the lifting mechanism 3 works in the same way as above, causing the lifting part 331 to adsorb and lift the yarn package 5, so that the yarn package 5 rises stably above the conveyor roller 21. This process is repeated until all the lifting mechanisms 3 have lifted the yarn package 5. Then the negative pressure source 36 is turned off, the negative pressure of the negative pressure suction port 332 disappears, and it no longer adsorbs the yarn package 5.

[0033] Subsequently, the two yarn pressing mechanisms 4 work synchronously. The telescopic end of the Y-axis linear drive device 42 extends, driving the fixed guide rod 46 to move closer to the conveying mechanism 2. The first Y-axis sliding plate 44 slides through the first guide rail 43, and the second Y-axis sliding plate 49 slides through the second guide rail 48. This allows the yarn pressing components 47 of the two yarn pressing mechanisms 4 to come together, so that the two fixed half-beveling molds 475 are assembled into a bowl-shaped fixed beveling mold, and the two movable half-beveling molds 473 are assembled into a bowl-shaped movable beveling mold. When the matching fixed beveling molds and movable beveling molds are assembled, they are located on both sides of the yarn package 5, as shown below. Figure 2 As shown; then the two X-axis linear drive devices 41 work synchronously. The X-axis linear drive device 41 drives the X-axis pusher 45 to move to the right. The X-axis pusher 45 drives the guide sleeve 471 to slide on the fixed guide rod 46. The guide sleeve 471 drives the movable half-chamfering mold 473 to move to the right. During the movement, the movable half-chamfering mold 473 always maintains the movable chamfering mold that is assembled into a bowl shape. The movable chamfering mold moves closer to the yarn package 5 and pushes the yarn package 5 to move on the support part 331 until it contacts the fixed chamfering mold. Finally, the movable chamfering mold cooperates with the fixed chamfering mold, contacts both ends of the yarn package 5 and presses the yarn package 5 to chamfer it.

[0034] After the yarn pressing and chamfering are completed, as follows: Figure 4 As shown, the telescopic end of the Y-axis linear drive device 42 retracts to drive the movable half-beveling mold 473 and the fixed half-beveling mold 475 to reset. The lifting mechanism 3 resets and drives the yarn package 5 to descend onto the conveying roller 21. The conveying roller 21 outputs the yarn package 5 that has completed the yarn pressing and beveling, thereby realizing batch yarn pressing and beveling operations and improving production efficiency.

[0035] For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept, and all such modifications and improvements fall within the scope of protection of this invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

[0036] 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 this invention.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0038] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

Claims

1. A split-type batch yarn pressing and chamfering device for yarn packages, comprising a frame (1), characterized in that, It also includes a conveying mechanism (2), a lifting mechanism (3), and two yarn pressing mechanisms (4); The conveying mechanism (2) includes several conveying rollers (21) arranged in a straight line and rotatably mounted on the frame (1), and a drive motor (22) fixedly mounted on the frame (1) for driving the conveying rollers (21) to rotate. The lifting mechanism (3) is configured as multiple and arranged in a straight line. The lifting mechanism (3) includes a Z-axis linear drive device (31), a lifting plate (32), and a support arm (33). The Z-axis linear drive device (31) is fixedly installed on the frame (1). The lifting plate (32) is fixedly installed on the output end of the Z-axis linear drive device (31). At least two support arms (33) for lifting the yarn (5) located on the conveying roller (21) are installed on the lifting plate (32). The support arms (33) move up and down in a straight line in the gap between two adjacent conveying rollers (21). The yarn pressing mechanism (4) is symmetrically arranged on both sides of the conveying mechanism (2). The yarn pressing mechanism (4) includes an X-axis linear drive device (41), a Y-axis linear drive device (42), a first guide rail (43), a first Y-axis sliding plate (44), an X-axis pusher (45), a fixed guide rod (46), and yarn pressing components (47). The first guide rail (43) and the Y-axis linear drive device (42) are both fixedly installed on the frame (1). The first Y-axis sliding plate (44) is fixedly installed on the slider of the first guide rail (43). The X-axis linear drive device (41) is fixedly installed on the first Y-axis sliding plate (44). The X-axis pusher (45) and the fixed guide rod (46) are fixedly installed on the first Y-axis sliding plate (44). The output end of the Y-axis linear drive device (42) is connected to the fixed guide rod (46). Multiple yarn pressing components (47) are installed on the fixed guide rod (46). The yarn pressing assembly (47) includes a guide sleeve (471), a movable connecting plate (472), a movable half-beveling mold (473), a fixed connecting plate (474), and a fixed half-beveling mold (475). The guide sleeve (471) is slidably mounted on the fixed guide rod (46) and does not rotate relative to the fixed guide rod (46). The movable connecting plate (472) and the X-axis pusher (45) are fixedly connected to the guide sleeve (471). The movable half-beveling mold (473) is fixedly connected to the movable connecting plate (472). The fixed connecting plate (474) is fixedly mounted on the fixed guide rod (46). The fixed half-beveling mold (475) is fixedly connected to the fixed connecting plate (474). The fixed half-beveling mold (475) and the movable half-beveling mold (473) are arranged facing each other. The two fixed half-beveling molds (475) can be assembled into a bowl shape, and the two movable half-beveling molds (473) can be assembled into a bowl shape.

2. The split-type batch yarn pressing and chamfering device according to claim 1, characterized in that, The drive motor (22) drives the conveying roller (21) to rotate through the transmission assembly. The transmission assembly includes a drive pulley (23), a driven pulley (24) and a transmission belt (25). The drive pulley (23) is installed at the output end of the drive motor (22). Each conveying roller (21) is equipped with a driven pulley (24). The drive pulley (23) is connected to each driven pulley (24) through the transmission belt (25).

3. The split-type batch yarn pressing and chamfering device according to claim 1, characterized in that, The lifting mechanism (3) also includes a proximity switch (34), which is fixedly installed on the frame (1) and used to detect the position of the yarn package (5).

4. The split-type batch yarn pressing and chamfering device according to claim 1, characterized in that, The yarn pressing mechanism (4) also includes a second guide rail (48) fixedly installed on the frame (1) and a second Y-axis sliding plate (49) located above the second guide rail (48). The second Y-axis sliding plate (49) is fixedly connected to the slider of the fixed guide rod (46) and the second guide rail (48).

5. The split-type batch yarn pressing and chamfering device according to claim 1, characterized in that, The conveying roller (21) is a V-shaped roller.

6. The split-type batch yarn pressing and chamfering device according to claim 1, characterized in that, The support arm (33) includes a support portion (331) located at its top, the top of which forms a concave limiting space for restricting the radial movement of the yarn package (5).

7. The split-type batch yarn pressing and chamfering device according to claim 6, characterized in that, The top of the lifting part (331) is provided with several negative pressure suction ports (332), and the support arm (33) is provided with an air intake port (333) that communicates with the negative pressure suction ports (332). The air intake port (333) is connected to the negative pressure source (36) through the negative pressure suction tube (35).

8. The split-type batch yarn pressing and chamfering device according to claim 7, characterized in that, A solenoid valve (37) is installed on the negative pressure suction tube (35).

9. The split-type batch yarn pressing and chamfering device according to claim 1, characterized in that, The fixed guide rod (46) is provided in two parts, and the guide sleeve (471) is slidably fitted on the two fixed guide rods (46).

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