High-precision angle adjusting cutting machine for intelligent manufacturing numerical control machinery

Abstract

The invention relates to the technical field of cutting machines, in particular to an intelligent manufacturing numerical control mechanical high-precision angle adjusting cutting machine which comprises a machining table and a cutting machine body slidably mounted on the side face of the machining table, a supporting frame is slidably mounted on the side face of the machining table, a telescopic piece is arranged on the side face of the supporting frame, and a rotating shaft is rotatably mounted on the supporting frame; one end of the rotating shaft is connected with the cutting machine, and the other end of the rotating shaft is provided with a rotation adjusting box; a mounting frame is fixedly mounted on the rotating shaft, a protective frame is slidably mounted on the mounting frame, and an air storage cylinder is fixedly mounted on the protective frame and used for cooling a cutting blade of the cutting machine. According to the cutting machine, the cutting blade of the cutting machine can be conveniently protected, the cutting blade can be rapidly cooled in the continuous working process of the cutting blade, the temperature of the surface of the cutting blade is reduced, and the service life of the cutting blade is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of cutting machines, and particularly relates to a cutting machine with high-precision angle adjustment for intelligent manufacturing numerical control machinery. Background Art

[0002] A cutting machine is a common device for cutting materials such as square and flat metal pipes, square and flat steel, I-beams, channel steel, carbon yuan steel, and round pipes. It mainly consists of a base, a grinding wheel, an electric motor or other power source, a bracket, a protective cover, a water feeder, etc. The grinding wheel is arranged on the top surface of the base, and the base has a space for accommodating the power source inside; During the process of the cutting blade of the cutting machine cutting an object, the contact surface between the cutting blade and the object will rub against the object at high speed. Especially the part where the cutting blade inserts into the object's cut surface (usually the part near the cutting teeth of the cutting blade, and the linear velocity of this part is relatively large during the rotation of the cutting blade, and the corresponding friction is also the most). Especially when the cutting blade is working continuously; the overheated cutting blade will accelerate the wear of the cutting teeth and reduce the service life of the cutting blade. Summary of the Invention

[0003] Technical Problems to be Solved Aiming at the above-mentioned shortcomings of the existing technology, the present invention provides a cutting machine with high-precision angle adjustment for intelligent manufacturing numerical control machinery, which can effectively solve the problem that during the process of the cutting blade of the cutting machine in the existing technology cutting an object, the contact surface between the cutting blade and the object will rub against the object at high speed. Especially the part where the cutting blade inserts into the object's cut surface. Especially when the cutting blade is working continuously; the overheated cutting blade will accelerate the wear of the cutting teeth and reduce the service life of the cutting blade.

[0004] Technical Solutions To achieve the above purposes, the present invention is realized through the following technical solutions: The present invention provides a cutting machine with high-precision angle adjustment for intelligent manufacturing numerical control machinery, including a processing table and a cutting machine slidably installed on the side of the processing table. A support frame is slidably installed on the side of the processing table. An expansion member for driving the support frame to approach or move away from the processing table is arranged on the side of the support frame. A rotating shaft is rotatably installed on the support frame. One end of the rotating shaft is connected to the cutting machine, and a rotating adjustment box is arranged at the other end of the rotating shaft for adjusting the rotation angle of the rotating shaft; An installation frame is fixedly installed on the rotating shaft. A protective frame is slidably installed on the installation frame for protecting the cutting blade of the cutting machine. An air storage cylinder is fixedly installed on the protective frame for cooling the cutting blade of the cutting machine.

[0005] Further, the protective frame includes semi-circular protective rods that are protectively installed on both sides of the cutting blade of the cutting machine. Connecting rods are fixedly installed on the protective rods. The middle of the connecting rod passes through the mounting frame and is slidably connected to the mounting frame. A guide rod for guiding the horizontal sliding of the connecting rod is provided on the mounting frame, and a return spring for driving the connecting rod to reset is sleeved outside the guide rod.

[0006] Further, a plurality of heat dissipation holes are arranged in a circumferential array on the side of the protective rod facing the cutting blade of the cutting machine. A connecting pipe is provided on the air storage cylinder, and the connecting pipe is used to guide the gas inside the air storage cylinder to enter the heat dissipation holes to cool the cutting blade.

[0007] Further, a piston rod is slidably installed inside the air storage cylinder. One end of the piston rod extending out of the air storage cylinder is connected to the connecting rod. A one-way intake valve is provided at one end of the air storage cylinder facing the connecting rod. During the process of the connecting rod driving the piston rod to slide away from the air storage cylinder, the piston rod is driven to squeeze the gas inside the air storage cylinder into the heat dissipation holes to dissipate heat and cool the cutting blade.

[0008] Further, the central axis of the heat dissipation hole is inclined towards the direction of the serration of the cutting blade. A semi-circular disc is fixedly installed at the end of the protective rod facing the processing table, and the semi-circular disc is used to abut against the side of the processing table when the cutting machine moves towards the processing table.

[0009] Further, a cutting groove is provided at the position of the processing table directly opposite the cutting blade of the cutting machine. A limiting groove is provided on one side of the upper end surface of the processing table close to the cutting machine. The limiting groove is used to guide the movement of the raw material to be cut, and a pressing member for fixing the raw material to be cut is fixedly installed above the limiting groove.

[0010] Further, pressing members are fixedly installed on both sides of the cutting groove. The pressing member includes a pressing platform and a pressing plate that slides up and down below the pressing platform. A telescopic rod for driving the pressing plate is fixedly installed on the pressing platform, and the pressing plate is used to press and fix the raw material to be cut inside the limiting groove.

[0011] Further, an installation through hole is provided on the limiting groove, and a support member is provided below the installation through hole. The support member includes a support elastic member, and a support roller is provided above the support elastic member. The support roller is used to pass through the installation through hole to support the raw material to be cut.

[0012] Further, an installation groove is provided on the side of the processing table. A slider is slidably installed inside the installation groove. A return elastic member for driving the slider to move towards the cutting machine is provided on the slider, and a limiting wedge block for driving the support roller to move downward is provided on the side of the slider away from the cutting machine.

[0013] Beneficial effects The technical solution provided by the present invention has the following beneficial effects compared with the known public technologies: 1. In the present invention, the rotating shaft is rotatably installed on the support frame, and the cutting machine is fixedly installed at one end of the rotating shaft. Since a rotating adjustment box is provided at the other end of the rotating shaft, during use, the rotation angle of the rotating shaft can be adjusted according to the required cutting angle. In addition, since protective frames are provided on both sides of the cutting blade of the cutting machine, and air storage cylinders for cooling the cutting blade are provided on the protective frames, during use, it is not only convenient to protect the cutting blade of the cutting machine, but also can quickly cool the cutting blade during the continuous operation of the cutting blade, reduce the temperature on the surface of the cutting blade, and increase the service life of the cutting blade.

[0014] 2. In the present invention, protective rods adapted to the contour of the cutting blade are provided on both sides of the cutting blade, and heat dissipation holes are provided on the end faces of the two protective rods facing each other. When using the cutting blade to cut raw materials, the telescopic member drives the entire support frame to move towards the processing table. When the protective rod abuts against the side of the processing table, the movement of the protective rod towards the processing table will be restricted, so that the cutting blade extends between the two protective rods to cut the raw materials. After cutting is completed, the telescopic member retracts to drive the cutting blade to retract between the two protective rods. At the same time, the air storage cylinder supplies cooling air to the heat dissipation holes, accelerating the air flow rate around the serrations of the cutting blade, enabling the surface of the cutting blade to exchange heat with the air faster, and cooling the cutting blade faster.

[0015] 3. In the present invention, the central axis of the heat dissipation hole is inclined towards the direction of the serrations of the cutting blade, which can make the cooling air blow along the serration direction, making it easier for the cutting debris remaining on the serrations to fall off the cutting blade, and increasing the cutting efficiency of the serrations during use.

[0016] 4. In the present invention, a support member is provided below the limiting groove. When placing the raw material to be cut into the limiting groove, the support rollers of the support member can support the raw material to be cut. When it is necessary to push the raw material to be cut for movement, the rolling friction between the support rollers and the raw material to be cut makes it easier to push the raw material to be cut. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 Side view of the overall structure of the present invention; Figure 3 Schematic diagram of the overall structure of the protective frame of the present invention; Figure 4 Schematic diagram of the overall structure of the protective frame and the cutting disc of the present invention; Figure 5 Schematic diagram of the internal structure of the air storage tank of the present invention; Figure 6 Partial cross-sectional view of the processing table of the present invention; Figure 7 For the present invention Figure 6 Schematic diagram of the enlarged partial structure at position A; Figure 8 Exploded view of the overall structure of the processing table of the present invention; Figure 9 Schematic diagram of the overall structure of the support member of the present invention mounted on the bottom plate.

[0019] The reference numerals in the figure respectively represent: 1. Processing table; 101. Cutting groove; 102. Installation groove; 11. Limit groove; 1101. Installation through hole; 12. Pressing member; 121. Pressing plate; 13. Slide block; 131. Reset elastic member; 132. Limit wedge block; 14. Support member; 141. Support elastic member; 142. Support roller; 15. Bottom plate; 2. Cutting machine; 21. Rotating shaft; 22. Rotating adjustment box; 23. Driving motor; 24. Telescopic member; 25. Installation frame; 26. Support frame; 3. Protective frame; 301. Heat dissipation hole; 31. Protective rod; 311. Semi-circular disc; 312. Connecting rod; 32. Air storage cylinder; 321. Piston rod; 322. One-way air inlet valve; 33. Connecting pipe; 34. Reset spring; 35. Guide rod. Detailed implementation manners

[0020] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0021] The present invention will be further described below with reference to the embodiments.

[0022] Embodiment: A cutting machine for intelligently manufacturing a numerically controlled machine tool with high-precision angle adjustment, as Figure 1 - Figure 3As shown in the figure, it includes a processing table 1 and a cutting machine 2 slidably installed on the side of the processing table 1. A support frame 26 is slidably installed on the side of the processing table 1. An expansion member 24 for driving the support frame 26 to approach or move away from the processing table 1 is arranged on the side of the support frame 26. A rotating shaft 21 is rotatably installed on the support frame 26. One end of the rotating shaft 21 is connected to the cutting machine 2, and a rotating adjustment box 22 is arranged at the other end of the rotating shaft 21. A meshing gear set and a driving motor 23 are arranged on the rotating adjustment box 22. The driving motor 23 adjusts the rotation of the rotating shaft 21 by driving the meshing gear set to rotate, and the rotating adjustment box 22 is used to adjust the rotation angle of the rotating shaft 21; An installation frame 25 is fixedly installed on the rotating shaft 21. A protective frame 3 is slidably installed on the installation frame 25. The protective frame 3 is used to protect the cutting blade of the cutting machine 2. An air storage cylinder 32 is fixedly installed on the protective frame 3. The air storage cylinder 32 is used to cool the cutting blade of the cutting machine 2.

[0023] In the present invention, the rotating shaft 21 is rotatably installed on the support frame 26, and the cutting machine 2 is fixedly installed at one end of the rotating shaft 21. Since a rotating adjustment box 22 is arranged at the other end of the rotating shaft 21, during use, the rotation angle of the rotating shaft 21 can be adjusted according to the required cutting angle. In addition, since protective frames 3 are arranged on both sides of the cutting blade of the cutting machine 2, and an air storage cylinder 32 for cooling the cutting blade is arranged on the protective frame 3, during use, it is not only convenient to protect the cutting blade of the cutting machine 2, but also can quickly cool the cutting blade during the continuous operation of the cutting blade, reduce the temperature on the surface of the cutting blade, and increase the service life of the cutting blade.

[0024] Further, as Figure 3 and Figure 4 shown, the protective frame 3 includes semi-circular protective rods 31 installed on both sides of the cutting blade of the cutting machine 2. The protective rods 31 can prevent cutting debris from splashing to the side far from the processing table 1 during the cutting process of the cutting blade, reduce the splashing range of the cutting debris, and make it more convenient for cleaning (in addition, the protective cover can prevent the cutting blade from colliding with other objects during storage and reduce the risk of damage). A connecting rod 312 is fixedly installed on the protective rod 31. The middle part of the connecting rod 312 passes through the installation frame 25 and is slidably connected to the installation frame 25. A guide rod 35 for guiding the horizontal sliding of the connecting rod 312 is arranged on the installation frame 25. A return spring 34 for driving the connecting rod 312 to reset is sleeved outside the guide rod 35; A plurality of heat dissipation holes 301 are arranged in a circumferential array on the side of the protective rod 31 facing the cutting blade of the cutting machine 2. A connecting pipe 33 is arranged on the air storage cylinder 32. The connecting pipe 33 is used to guide the gas inside the air storage cylinder 32 to enter the heat dissipation holes 301 to cool the cutting blade.

[0025] Among them, by arranging protective rods 31 that are mutually adapted to the contour of the cutting disc on both sides of the cutting disc, and arranging heat dissipation holes 301 on the end faces of the two protective rods 31 facing each other, when using the cutting disc to cut raw materials, the telescopic member 24 drives the entire support frame 26 to move towards the processing table 1. When the protective rod 31 abuts against the side of the processing table 1, the movement of the protective rod 31 towards the processing table 1 will be restricted, so that the cutting disc extends between the two protective rods 31 to cut the raw materials. After cutting is completed, the telescopic member 24 retracts to drive the cutting disc to retract between the two protective rods 31. At the same time, the air storage cylinder 32 supplies cooling air to the heat dissipation holes 301, accelerating the air flow rate around the saw teeth of the cutting disc, enabling the surface of the cutting disc to exchange heat with the air faster, and cooling the cutting disc faster.

[0026] Further, as Figure 4 and Figure 5 shown, a piston rod 321 is slidably installed inside the air storage cylinder 32. A through hole is provided on the side of the air storage cylinder 32 away from the processing table 1. One end of the piston rod 321 extending out of the air storage cylinder 32 is connected to the connecting rod 312. A one-way intake valve 322 is provided at one end of the air storage cylinder 32 facing the connecting rod 312. During the sliding process of the connecting rod 312 driving the piston rod 321 away from the air storage cylinder 32, the piston rod 321 is driven to squeeze the gas inside the air storage cylinder 32 into the heat dissipation holes 301 to dissipate heat and cool the cutting disc.

[0027] Among them, by slidably installing the piston rod 321 inside the air storage cylinder 32, when the cutting machine 2 moves towards the processing table 1, the connecting rod 312 moves away from the processing table 1 relative to the cutting disc of the cutting machine 2, causing the piston rod 321 inside the air storage cylinder 32 to move away from the processing table 1 relative to the air storage cylinder 32, allowing air to enter the space on the right side of the piston of the piston rod 321. Then, when the cutting machine 2 moves away from the processing table 1, the piston rod 321 squeezes the air on the right side of the piston, causing the air here to enter the heat dissipation holes 301 through the connecting pipe 33 and be discharged, cooling the cutting disc of the cutting machine 2.

[0028] Further, as Figure 3 shown, the central axis of the heat dissipation hole 301 is inclined towards the direction of the saw teeth of the cutting disc. A semi-circular disc 311 is fixedly installed at the end of the protective rod 31 facing the processing table 1. The semi-circular disc 311 is used to abut against the side of the processing table 1 during the movement of the cutting machine 2 towards the processing table 1.

[0029] Among them, the central axis of the heat dissipation hole 301 being inclined towards the direction of the saw teeth of the cutting disc can cause the cooling air to blow along the direction of the saw teeth, making it easier for the cutting debris remaining on the saw teeth to fall off the cutting disc, increasing the cutting efficiency during the use of the saw teeth.

[0030] Furthermore, as shown in Figure 6 and Figure 7 , a cutting groove 101 is provided at the position of the cutting blade of the cutting machine 2 facing the processing table 1. A limiting groove 11 is provided on one side of the upper end surface of the processing table 1 close to the cutting machine 2. The limiting groove 11 is used to guide the movement of the raw material to be cut. A pressing member 12 for fixing the raw material to be cut is fixedly installed above the limiting groove 11. Pressing members 12 are fixedly installed on both sides of the cutting groove 101. The pressing member 12 includes a pressing platform and a pressing plate 121 slidably installed up and down below the pressing platform. A telescopic rod for driving the pressing plate 121 is fixedly installed on the pressing platform. The pressing plate 121 is used to press and fix the raw material to be cut inside the limiting groove 11.

[0031] Among them, by providing a pressing platform on the processing table 1 and installing the pressing plate 121 below the pressing platform through a telescopic rod, the up and down movement of the pressing plate 121 can be conveniently controlled to fix the raw material to be cut, avoiding the position deviation of the raw material to be cut during the cutting process and cutting out the raw material of the corresponding size more accurately.

[0032] Furthermore, as shown in Figure 8 and Figure 9 , an installation through hole 1101 is provided on the limiting groove 11. A support member 14 is provided below the installation through hole 1101. The support member 14 includes a support elastic member 141. A support roller 142 is provided above the support elastic member 141. A bottom plate 15 is provided below the processing table 1. The lower part of the support elastic member 141 is fixedly installed on the bottom plate 15. The upper part of the support elastic member 141 is connected to the support roller 142. The support roller 142 is used to pass through the installation through hole 1101 to support the raw material to be cut. An installation groove 102 is provided on the side surface of the processing table 1. A slider 13 is slidably installed inside the installation groove 102. A reset elastic member 131 for driving the slider 13 to move towards the cutting machine 2 is provided on the slider 13. The elastic moduli of the reset elastic member 131 and the support elastic member 141 are much smaller than that of the reset spring 34. A limiting wedge 132 for driving the support roller 142 to move downward is provided on the side of the slider 13 away from the cutting machine 2.

[0033] Among them, by arranging a support member 14 below the limit groove 11, when placing the raw material to be cut into the limit groove 11, the support roller 142 of the support member 14 can support the raw material to be cut. When it is necessary to push the raw material to be cut for movement, the support roller 142 and the raw material to be cut are in rolling friction, making it easier to push the raw material to be cut. During the cutting process, the cutting machine 2 moves towards the processing table 1 driven by the telescopic member 24, so that the semi-circular disk 311 abuts against the processing table 1. At this time, the semi-circular disk 311 presses the slider 13, causing the slider 13 to move towards the support member 14, and the limit wedge 132 on the side of the slider 13 drives the entire support member 14 to move downward, so that the support roller 142 is hidden inside the installation through hole 1101 and no longer supports the raw material to be cut, making the bottom of the raw material to be cut closely contact with the upper end surface of the limit groove 11, and making the raw material to be cut more stably fixed inside the limit groove 11. Then, as the cutting machine 2 continues to move towards the processing table 1, the cutting blade of the cutting machine 2 is inserted into the cutting groove 101 to cut and process the raw material to be cut.

[0034] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the various embodiments of the present invention.

Claims

1. An intelligent manufacturing CNC mechanical high-precision angle adjustment cutting machine, comprising a processing table (1) and a cutting machine (2) slidably mounted on the side of the processing table (1), characterized in that: A support frame (26) is slidably mounted on the side of the processing table (1); a telescopic member (24) is arranged on the side of the support frame (26) for driving the support frame (26) to move closer to or away from the processing table (1); a rotating shaft (21) is rotatably mounted on the support frame (26); one end of the rotating shaft (21) is connected to the cutting machine (2); and a rotating adjustment box (22) is arranged on the other end of the rotating shaft (21); the rotating adjustment box (22) is used to adjust the rotation angle of the rotating shaft (21); A mounting frame (25) is fixedly mounted on the rotating shaft (21), a protective frame (3) is slidably mounted on the mounting frame (25), the protective frame (3) is used to protect a cutting blade of the cutting machine (2), and an air cylinder (32) is fixedly mounted on the protective frame (3), the air cylinder (32) is used to cool the cutting blade of the cutting machine (2).

2. According to claim 1, the intelligent manufacturing CNC mechanical high-precision angle adjustment cutting machine is characterized in that: The protective frame (3) comprises a semicircular protective rod (31) mounted on both sides of a cutting blade of the cutting machine (2); a connecting rod (312) is fixedly mounted on the protective rod (31); a middle portion of the connecting rod (312) passes through the mounting frame (25) and is slidably connected to the mounting frame (25); a guide rod (35) for guiding the connecting rod (312) to slide horizontally is provided on the mounting frame (25); a return spring (34) for driving the connecting rod (312) to return to its original position is sleeved on the outer side of the guide rod (35).

3. The intelligent manufacturing CNC mechanical high-precision angle adjustment cutting machine according to claim 2 is characterized in that: A plurality of heat dissipation holes (301) are arranged in a circular array on one side of the protection rod (31) facing the cutting blade of the cutting machine (2), and a connecting pipe (33) is arranged on the gas cylinder (32), wherein the connecting pipe (33) is used to guide the gas inside the gas cylinder (32) to enter the heat dissipation holes (301) to cool the cutting blade.

4. The intelligent manufacturing CNC mechanical high-precision angle adjustment cutting machine according to claim 3 is characterized in that: A piston rod (321) is slidably mounted inside the gas cylinder (32); one end of the piston rod (321) extending out of the gas cylinder (32) is connected to a connecting rod (312); one end of the gas cylinder (32) facing the connecting rod (312) is provided with a one-way air intake valve (322); when the connecting rod (312) drives the piston rod (321) to slide away from the gas cylinder (32), the piston rod (321) is driven to squeeze the gas inside the gas cylinder (32) into the heat dissipation hole (301) to dissipate heat and cool the cutting blade.

5. The intelligent manufacturing CNC mechanical high-precision angle adjustment cutting machine according to claim 4 is characterized in that: The central axis of the heat dissipation hole (301) is inclined toward the direction of the saw teeth of the cutting blade, and a semi-circular disk (311) is fixedly mounted on the end of the protective rod (31) facing the processing table (1), and the semi-circular disk (311) is used to abut against the side of the processing table (1) when the cutting machine (2) moves toward the processing table (1).

6. The intelligent manufacturing CNC mechanical high-precision angle adjustment cutting machine according to claim 5, characterized in that: The processing table (1) is provided with a cutting groove (101) at a position facing the cutting blade of the cutting machine (2); a limiting groove (11) is provided on a side of the upper end surface of the processing table (1) close to the cutting machine (2); the limiting groove (11) is used to guide the movement of the material to be cut; and a clamping member (12) for fixing the material to be cut is fixedly installed above the limiting groove (11).

7. The intelligent manufacturing CNC mechanical high-precision angle adjustment cutting machine according to claim 6, characterized in that: A clamping member (12) is fixedly mounted on both sides of the cutting groove (101), the clamping member (12) comprising a clamping platform and a pressing plate (121) mounted below the clamping platform for sliding up and down, a telescopic rod for driving the pressing plate (121) is fixedly mounted on the clamping platform, and the pressing plate (121) is used to press and fix the material to be cut inside the limiting groove (11).

8. The intelligent manufacturing CNC mechanical high-precision angle adjustment cutting machine according to claim 7, characterized in that: The limiting groove (11) is provided with a mounting through hole (1101), a support member (14) is provided below the mounting through hole (1101), the support member (14) comprises a supporting elastic member (141), a supporting roller (142) is provided above the supporting elastic member (141), and the supporting roller (142) is used to pass through the mounting through hole (1101) to support the material to be cut.

9. The intelligent manufacturing CNC mechanical high-precision angle adjustment cutting machine according to claim 8, characterized in that: A mounting groove (102) is provided on the side of the processing table (1), a slider (13) is slidably mounted inside the mounting groove (102), a reset elastic member (131) is provided on the slider (13) for driving the slider (13) to move in the direction of the cutting machine (2), and a limiting wedge block (132) is provided on the side of the slider (13) away from the cutting machine (2) for driving the supporting roller (142) to move downward.

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