Film roll splitting method

Abstract

The present invention discloses a film roll cutting method, in which a first conveying assembly and a second conveying assembly are used to convey the film roll; a film guide and film cutting assembly is provided corresponding to the film on the second conveying assembly; a first driving mechanism of the film guide and film cutting assembly drives the cutting mechanism of the film guide and film cutting assembly to move transversely along the film to a first position; the cutting mechanism is rotationally connected to the moving end of the first driving mechanism; the first driving mechanism is paused, and the cutter of the cutting mechanism extends to cut strips of the film of a required length; the first driving mechanism is started, and the first driving mechanism drives the cutting mechanism to continue to move transversely along the film, and the cutter cuts off the remaining film; the first driving mechanism drives the cutting mechanism to continue to move transversely along the film to a second position. In the present invention, the film guide and film cutting assembly is used instead of manual labor to cut the film, which saves time and labor, and can also prevent manual labor from entering the inside of the equipment, thereby improving the safety of manual operation.

Description

Technical Field

[0001] The present invention relates to the field of film penetration technology, in particular to a film roll splitting method. Background Art

[0002] Film stretching equipment requires a chain film threading mechanism due to its high roller temperature, small roller spacing, and high density. This chain film threading requires the film to be cut into strips of appropriate width before entering the component to ensure smooth film threading. Therefore, the film roll needs to be split before threading to obtain strips of appropriate width. The current film roll splitting method uses conveying equipment to transport the film roll. Since the film tension inside the equipment is conducive to cutting, manual labor is required to enter the equipment and use a handheld knife to cut the film to obtain strips of appropriate width. This is time-consuming and labor-intensive, and due to the high film conveying speed, there is a risk of the body being caught in the equipment when manually cutting and guiding the film. Summary of the Invention

[0003] The purpose of this application is to provide a film roll splitting method to solve the problems raised in the above background technology.

[0004] To achieve the above objectives, this application provides the following technical solutions:

[0005] A film roll segmentation method includes a first conveying assembly and a second conveying assembly for conveying the film roll, wherein the second conveying assembly is arranged downstream of the first conveying assembly; and further comprising the following steps:

[0006] A film guiding and cutting assembly is provided corresponding to the film on the second conveying assembly. The first driving mechanism of the film guiding and cutting assembly drives the cutting mechanism of the film guiding and cutting assembly to move in the transverse direction of the film to a first position. The cutting mechanism is rotatably connected to the moving end of the first driving mechanism. The first driving mechanism pauses, and the cutter of the cutting mechanism extends to cut strips of the required length from the film; the first driving mechanism is started, and the first driving mechanism drives the cutting mechanism to continue to move in the transverse direction of the film, and the cutter cuts off the remaining film; the first driving mechanism drives the cutting mechanism to continue to move in the transverse direction of the film to a second position.

[0007] Furthermore, the film guiding and cutting assembly also includes a core shaft, a bearing and a bearing seat. The core shaft is connected to the moving end of the first driving mechanism, the axis of the core shaft is perpendicular to the moving direction of the first driving mechanism, the core shaft and the bearing seat are respectively connected to the inner ring and outer ring of the bearing, and the bearing seat is connected to the cutting mechanism.

[0008] Furthermore, the cutting mechanism includes a second drive mechanism and a cutter, the fixed end of the second drive mechanism is connected to the bearing seat, the movable end of the second drive mechanism is connected to one end of the cutter, and the moving direction of the second drive mechanism is parallel to the axis of the core shaft.

[0009] Furthermore, a protective cover is provided outside the cutter.

[0010] Furthermore, the movable end of the first driving mechanism is provided with a travel switch approach plate, and the fixed end of the driving mechanism is provided with a first travel switch and a second travel switch corresponding to the first position and the second position respectively.

[0011] Furthermore, the second conveying assembly includes a first wall panel, a pressure roller mechanism, a first guide roller, a second guide roller and a third guide roller. The first guide roller, the second guide roller and the third guide roller are all rotatably connected to the first wall panel. The first guide roller and the third guide roller are sequentially arranged on the upper part of the first wall panel along the conveying direction of the film roll. The second guide roller is located in the middle below the first guide roller and the third guide roller. The pressure roller mechanism is arranged corresponding to the third guide roller.

[0012] Furthermore, the first conveying assembly includes a second wall plate, a fourth guide roller and a fifth guide roller. The fourth guide roller and the fifth guide roller are both rotatably connected to the second wall plate. The fifth guide roller is arranged above the fourth guide roller and close to the side of the second conveying assembly.

[0013] Furthermore, a connecting rod is connected between the first wall plate and the second wall plate, and a thickness gauge is provided on the connecting rod.

[0014] Furthermore, a guardrail is provided above and / or below the connecting rod.

[0015] Furthermore, the film guiding and cutting assembly is arranged between the first guide roller and the second guide roller.

[0016] In summary, the technical effects and advantages of the present invention are as follows:

[0017] 1. In the present invention, a film-guiding and film-cutting assembly is used to replace manual film cutting, which saves time and effort and avoids manual entry into the inner side of the device, thereby improving the safety of manual operation. The cutting mechanism is rotatably connected to the moving end of the first driving mechanism, and the cutter automatically adjusts the film cutting angle according to the pulling direction of the film path and its own lateral movement direction along the film, so that the cutter can smoothly cut off the remaining film.

[0018] 2. In the present invention, the cutting mechanism and the movable end of the first driving mechanism are rotatably connected by a bearing, which can reduce the resistance of the rotational connection between the two and improve the adaptability of the cutting mechanism to the film traction direction and the direction of its own transverse movement along the film.

[0019] 3. In the present invention, a travel switch approach plate is provided at the movable end of the first drive mechanism, and a first travel switch and a second travel switch are provided at the fixed end of the first drive mechanism corresponding to the first position and the second position, respectively. This enables the first drive mechanism and the second drive mechanism to be linked to the first position and the second position, thereby facilitating automatic control of the first drive mechanism and the second drive mechanism, and achieving a high degree of automation.

[0020] 4. In the present invention, the film roll is first conveyed from top to bottom through the first guide roller and the second guide roller in the second conveying assembly, and then output from bottom to top through the third guide roller, which can make the film tensioned, which is beneficial to the cutting of the film cutting assembly. The first guide roller and the third guide roller are located on the upper part of the first wall panel, and can raise the film path height to the required height; the third guide roller is the final output guide roller, and a pressure roller mechanism is provided at the third guide roller. On the one hand, the pressure roller mechanism forms traction on the film when pressing, and on the other hand, it can facilitate the flattening of the film. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 Schematic diagram of the structure of a film roll splitting device in one embodiment of the present invention;

[0023] Figure 2 This is a working principle diagram of a cutter in an initial state according to an embodiment of the present invention;

[0024] Figure 3 This is a working principle diagram of a cutter in a first position according to an embodiment of the present invention;

[0025] Figure 4 This is a diagram showing the working principle of the cutter in the strip cutting state in one embodiment of the present invention;

[0026] Figure 5 This is a working principle diagram of the cutter moving to the second position in one embodiment of the present invention;

[0027] Figure 6 This is a working principle diagram of the membrane cutting assembly in one embodiment of the present invention;

[0028] Figure 7 The structure of the membrane cutting assembly in one embodiment of the present invention is shown as follows: Figure 1 ;

[0029] Figure 8 The structure of the membrane cutting assembly in one embodiment of the present invention is shown as follows: Figure 2 ;

[0030] Figure 9 The structure of the membrane cutting assembly in one embodiment of the present invention is shown as follows: Figure 3 .

[0031] In the figure: 100, film; 1, first conveyor assembly; 2, second conveyor assembly; 3, film guiding and cutting assembly; 4, thickness gauge; 5, slitting strip; 6, film threading wheel; 7, film stretching device; 8, waste film; 9, waste film reel; 10, qualified film; 11, second wall plate; 12, fourth guide roller; 13, fifth guide roller; 21, first wall plate; 22, pressing roller mechanism; 23, first guide roller; 24, second guide roller; 25, third guide roller Roller; 31. First drive mechanism; 32. Cutting mechanism; 33. Mandrel; 34. Bearing; 35. Bearing seat; 311. Electric cylinder; 312. Motor; 313. Electric cylinder fixing seat; 314. Travel switch; 315. First travel switch approach plate; 321. Cylinder; 322. Air pipe; 323. Protective cover; 324. Knife handle; 325. Cutter fixing plate; 326. Blade; 41. Connecting rod; 42. Guardrail. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0035] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0036] In order to solve the problems in the prior art, an embodiment of the present invention provides a film roll splitting method, comprising:

[0037] The first conveying assembly 1 and the second conveying assembly 2 are used to convey the film roll. Figure 1 The figure shows a schematic structural diagram of a film roll splitting device, in which the second conveying component 2 is arranged downstream of the first conveying component 1 .

[0038] like Figure 1 As shown, in the film roll splitting device, a film guiding and cutting assembly 3 is provided corresponding to the film 100 on the second conveying assembly 2; the film guiding and cutting assembly 3 includes a first driving mechanism 31 and a cutting mechanism 32, the cutting mechanism 32 including a retractable cutter, which can cut the film when extended and separate from the film when retracted; the cutting mechanism 32 is rotatably connected to the moving end of the first driving mechanism 31, so that the cutter has the freedom to rotate in the running direction during operation. Figure 2 As shown, in the initial state, the cutter is at the initial position; after the film corresponding to the cutting mechanism 32 is stretched by the second conveying assembly 2, the first driving mechanism 31 is started, as shown Figure 3 As shown, the first driving mechanism 31 drives the cutting mechanism 32 to move to the first position along the transverse direction of the film, the first driving mechanism 31 is paused, the cutter of the cutting mechanism 32 extends, and due to the action of the second conveying assembly 2, the film is conveyed forward all the time, and the film moves longitudinally relative to the cutter, and the cutter can cut out a strip 5; when the strip 5 is long enough for manual film drawing and stretching, the operator goes to the downstream side of the second conveying assembly 2 to perform film drawing, as shown in FIG. Figure 4 As shown, the cut strip 5 passes through the film-threading wheel 6 of the film stretching device 7 in sequence according to the chain trajectory through the chain tied to the film-threading wheel 6. During the film-threading process, the excess film can enter the waste film reel 9; after the film-threading is completed, the first drive mechanism 31 is started, as shown in FIG. Figure 5 As shown, the first driving mechanism 31 drives the cutting mechanism 32 to continue to move in the transverse direction of the film, and the cutter cuts off the remaining film, as shown in FIG. Figure 6 As shown, the film on the other side of the cut strip 5 is waste film 8, which needs to be cut off from the film. The film behind the waste film 8 is qualified film 10. After the cut strip 5 passes through the film passing wheel 6 of the film stretching device 7, the connected qualified film 10 can be smoothly delivered to the film stretching device 7; Figure 5As shown, during the cutting of waste film 8, from a kinematic perspective, the film's motion exerts a force Fx on the cutter in the film's direction of motion. Furthermore, the film's motion exerts a resistance Fy in the lateral direction of the film. These two forces form a resultant force Fr. Since the cutting mechanism 32 is rotatably connected to the first drive mechanism 31, the cutter must be adjusted to the direction of the resultant force to smoothly cut the film when using an automatically operated cutter. Furthermore, since the magnitude of Fy is related to the speed of the blade 326, and the magnitude of Fx is related to the speed of the film, the direction of the resultant force may change at any time. The cutter of this embodiment can fully adapt to such changes in the direction of the resultant force, thereby replacing manual film cutting. The first drive mechanism 31 drives the cutting mechanism 32 to continue moving in the lateral direction of the film to a second position.

[0039] In this embodiment, a film-guiding and cutting assembly 3 is used instead of manual film cutting, which saves time and effort, and can avoid manual entry into the inside of the equipment, thereby improving the safety of manual operation; the cutting mechanism 32 is rotatably connected to the moving end of the first driving mechanism 31, and the cutter automatically adjusts the film cutting angle according to the traction direction of the film path and its own lateral movement direction along the film, so that the cutter can smoothly cut off the remaining film.

[0040] Optionally, after the first driving mechanism 31 drives the cutting mechanism 32 to continue moving to the second position along the transverse direction of the film, the first driving mechanism 31 pauses and the cutter retracts; the first driving mechanism 31 starts to drive the cutting mechanism 32 back to the initial position.

[0041] Further, if Figure 7-9 As shown, the film guide and cutting assembly 3 also includes a mandrel 33, a bearing 34, and a bearing seat 35. The mandrel 33 is connected to the movable end of the first drive mechanism 31, with the axis of the mandrel 33 perpendicular to the direction of movement of the first drive mechanism 31. The mandrel 33 and the bearing seat 35 are respectively connected to the inner and outer rings of the bearing 34, and the bearing seat 35 is connected to the cutting mechanism 32. In this embodiment, the use of the bearing 34 to achieve the rotational connection between the cutting mechanism 32 and the movable end of the first drive mechanism 31 reduces the resistance of the rotational connection between the two, and improves the adaptability of the cutting mechanism 32 to the film guide direction and its own lateral movement along the film. The bearing seat 35 can automatically adjust the film cutting angle of the cutter according to the film guide direction and its own movement direction. In this embodiment, the first drive mechanism 31 utilizes an electric cylinder 311, which is driven by a motor 312. The first drive mechanism 31 can also utilize a motor 312 with a screw nut or a belt drive structure. Optionally, the first driving mechanism 31 further includes two electric cylinder fixing seats 313 , and both ends of the electric cylinder 311 are respectively mounted on the second conveying assembly 2 through the electric cylinder fixing seats 313 .

[0042] Furthermore, the cutting mechanism 32 includes a second drive mechanism and a cutter. The fixed end of the second drive mechanism is connected to the bearing seat 35, and the movable end of the second drive mechanism is connected to one end of the cutter. The movement direction of the second drive mechanism is parallel to the axis of the core shaft 33. In this embodiment, the second drive mechanism is a cylinder 321, which is connected to the air source via an air pipe 322. The second drive mechanism can also be a hydraulic cylinder, a linear module, etc.

[0043] Furthermore, a protective cover 323 is provided on the outside of the cutter. The cutter extends out of the protective cover 323 when cutting and retracts into the protective cover 323 when not in use, meeting CE safety requirements. Optionally, the cutter includes a handle 324, a cutter fixing plate 325, and a blade 326. One end of the handle 324 is connected to the movable end of the second drive mechanism. The other end of the handle 324 has a mounting notch. One end of the blade 326 is mounted in the mounting notch via the cutter fixing plate 325. The other end of the blade 326 extends beyond the other end of the handle 324. Blade 326 has cutting edges on both sides.

[0044] Furthermore, a travel switch access plate 314 is provided at the movable end of the first drive mechanism 31, and a first travel switch 315 and a second travel switch are provided at the fixed end of the drive mechanism, corresponding to the first position and the second position, respectively. In the present invention, the travel switch access plate 314 is provided at the movable end of the first drive mechanism 31, and the first travel switch 315 and the second travel switch are provided at the fixed end of the first drive mechanism 31, corresponding to the first position and the second position, respectively. This enables linkage between the first drive mechanism 31 and the second drive mechanism and the first and second positions, facilitating automatic control of the first drive mechanism 31 and the second drive mechanism, and achieving a high degree of automation. Specifically, the cutter moves from the initial position to the first position, and the travel switch approaching plate 314 and the first travel switch 315 act to send a first in-position signal to the controller, and the controller controls the first drive mechanism 31 to pause, and the controller controls the cylinder 321 to drive the blade 326 out of the protective cover 323 to cut the film; after a preset time, the controller controls the first drive mechanism 31 to start, driving the cutter to continue to move laterally along the film to cut off the remaining film; the first drive mechanism 31 continues to drive the cutter to move, and the travel switch approaching plate 314 and the second travel switch act to send a second in-position signal to the controller, and the controller controls the cylinder 321 to retract the cutter; the controller controls the first drive mechanism 31 to drive the cutter back to the initial position.

[0045] Furthermore, the second conveying assembly 2 includes a first wall panel 21, a pressure roller mechanism 22, a first guide roller 23, a second guide roller 24 and a third guide roller 25. The first guide roller 23, the second guide roller 24 and the third guide roller 25 are all rotatably connected to the first wall panel 21. The first guide roller 23 and the third guide roller 25 are arranged in sequence on the upper part of the first wall panel 21 along the conveying direction of the film roll. The second guide roller 24 is located in the middle below the first guide roller 23 and the third guide roller 25. The pressure roller mechanism 22 is arranged corresponding to the third guide roller 25. In this embodiment, the film roll in the second conveyor assembly 2 is first conveyed from top to bottom over the first guide roller 23 and the second guide roller 24, and then discharged from bottom to top over the third guide roller 25. This tensions the film, facilitating cutting by the film guiding and cutting assembly 3. The first and third guide rollers 23 and 25 are located above the first wall panel 21, raising the film path to the desired height. The third guide roller 25 is the final discharge roller and is provided with a pressure roller mechanism 22. This pressure roller mechanism 22 not only tractions the film during compression but also facilitates flattening the film. In this embodiment, the first, second, and third guide rollers 23, 24, and 25 are all made of aluminum. Compared to steel guide rollers, aluminum rollers are lighter, have lower rotational resistance, are resistant to oxidation, and have a low friction coefficient, preventing scratches on the film. In this embodiment, the pressure roller mechanism includes a pressure roller and a reduction motor. The pressure roller and the third guide roller 25 work together to flatten and convey the film. The pressure roller is a rubber roller, which has a large friction force and can flatten the film, which is beneficial to the next procedure. The rubber roller receives the power of the reduction motor through the coupling so that it can traction the film when pressing.

[0046] Furthermore, the film guiding and cutting assembly 3 is mainly placed at the work station that needs to be processed. For example, the film cutting device film guiding and cutting assembly 3 is placed between the first guide roller 23 and the second guide roller 24. The film and the guide roller can form a larger wrap angle, so that the film can be stressed and stretched here, preventing the film from moving or shaking during the cutter operation, which will reduce the quality of the cut or even make it impossible to cut.

[0047] Furthermore, the first conveyor assembly 1 includes a second wall plate 11, a fourth guide roller 12, and a fifth guide roller 13. The fourth guide roller 12 and the fifth guide roller 13 are both rotatably connected to the second wall plate 11. The fifth guide roller 13 is located above the fourth guide roller 12, near the side of the second conveyor assembly 2. The film path enters at a low position and exits at a high position. Therefore, the first conveyor assembly 1 and the second conveyor assembly 2 function to elevate the film path. In this embodiment, the centerlines of the first guide roller 23, the third guide roller 25, and the fifth guide roller 13 are aligned; the second guide roller 24 and the fourth guide roller 12 are in a low position.

[0048] Furthermore, a connecting rod 41 is connected between the first wall panel 21 and the second wall panel 11, and a thickness gauge 4 is provided on the connecting rod 41. The thickness gauge 4 is capable of measuring the thickness of the film and is a commercially available product and will not be described in detail here. The overall components are compact, reducing the footprint. Furthermore, guardrails 42 are provided above and / or below the connecting rod 41. The position of the guardrails 42 prevents people from reaching out to touch the rotating guide rollers or the moving film, thereby preventing them from being caught in the machine; the guardrails 42 also prevent people from entering the equipment with their entire body, potentially causing mechanical injury.

[0049] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A film roll cutting method, wherein a first conveying component (1) and a second conveying component (2) are used to convey the film roll, and the second conveying component (2) is arranged downstream of the first conveying component (1); characterized in that: The following steps are also included: A film guiding and cutting assembly (3) is provided corresponding to the film on the second conveying assembly (2); the first driving mechanism (31) of the film guiding and cutting assembly (3) drives the cutting mechanism (32) of the film guiding and cutting assembly (3) to move to a first position in the transverse direction of the film; the cutting mechanism (32) is rotatably connected to the moving end of the first driving mechanism (31); the first driving mechanism (31) is paused, and the cutter of the cutting mechanism (32) extends to cut a strip (5) of a required length from the film; the first driving mechanism (31) is started, and the first driving mechanism (31) drives the cutting mechanism (32) to continue to move in the transverse direction of the film, and the cutter cuts off the remaining film; the first driving mechanism (31) drives the cutting mechanism (32) to continue to move in the transverse direction of the film to a second position; The second conveying assembly (2) comprises a first wall plate (21), a pressure roller mechanism (22), a first guide roller (23), a second guide roller (24) and a third guide roller (25); the first guide roller (23), the second guide roller (24) and the third guide roller (25) are all rotatably connected to the first wall plate (21); the first guide roller (23) and the third guide roller (25) are sequentially arranged on the upper part of the first wall plate (21) along the conveying direction of the film roll; the second guide roller (24) is located in the middle below the first guide roller (23) and the third guide roller (25); the pressure roller mechanism (22) is arranged corresponding to the third guide roller (25); The film guiding and cutting assembly (3) also includes a core shaft (33), a bearing (34) and a bearing seat (35), wherein the core shaft (33) is connected to the moving end of the first driving mechanism (31), the axis of the core shaft (33) is perpendicular to the moving direction of the first driving mechanism (31), the core shaft (33) and the bearing seat (35) are respectively connected to the inner ring and outer ring of the bearing (34), and the bearing seat (35) is connected to the cutting mechanism (32).

2. A film roll cutting method according to claim 1, characterized in that: The cutting mechanism (32) includes a second driving mechanism and a cutter, wherein the fixed end of the second driving mechanism is connected to the bearing seat (35), the movable end of the second driving mechanism is connected to one end of the cutter, and the moving direction of the second driving mechanism is parallel to the axis of the core shaft (33).

3. A film roll cutting method according to claim 2, characterized in that: A protective cover (323) is provided outside the cutter.

4. A film roll cutting method according to any one of claims 1 to 3, characterized in that: The movable end of the first driving mechanism (31) is provided with a travel switch approach plate (314), and the fixed end of the driving mechanism is provided with a first travel switch (315) and a second travel switch corresponding to the first position and the second position, respectively.

5. A film roll cutting method according to claim 1, characterized in that: The first conveying assembly (1) comprises a second wall plate (11), a fourth guide roller (12) and a fifth guide roller (13); the fourth guide roller (12) and the fifth guide roller (13) are both rotatably connected to the second wall plate (11); the fifth guide roller (13) is arranged above the fourth guide roller (12) and close to one side of the second conveying assembly (2).

6. A film roll cutting method according to claim 5, characterized in that: A connecting rod (41) is connected between the first wall plate (21) and the second wall plate (11), and a thickness gauge (4) is provided on the connecting rod (41).

7. A film roll cutting method according to claim 6, characterized in that: A guardrail (42) is provided above and / or below the connecting rod (41).

8. A film roll cutting method according to any one of claims 5 to 7, characterized in that: The film guiding and cutting assembly (3) is arranged between the first guide roller (23) and the second guide roller (24).

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