A wrapping machine capable of adjusting a wrapping angle and a wrapping method thereof

Abstract

The application discloses a wrapping machine capable of adjusting a wrapping angle and a wrapping method thereof. The wrapping machine comprises a wrapping cover and a wrapping unit arranged in the wrapping cover. The wrapping unit comprises two groups of symmetrically arranged wrapping mechanisms. Each group of the wrapping mechanisms comprises a wrapping part comprising four groups of circumferentially distributed wrapping pieces, a driving part comprising an adjusting driving piece connected with the wrapping part, a rotating wheel connected with the adjusting driving piece, and a rotating shaft connected with the rotating wheel. The adjusting driving piece comprises a shell, a proximal end driving piece arranged in the shell, a proximal end motor connected with the shell, a proximal end output gear sleeved on an output end of the proximal end motor, and a proximal end transmission gear engaged with the proximal end output gear, and a distal end driving piece arranged in the shell, a distal end motor connected with the shell, a distal end output gear sleeved on an output end of the distal end motor, and a distal end transmission gear engaged with the distal end output gear.

Description

Technical Field

[0001] This invention relates to the field of paper wrapping, specifically to a paper wrapping machine with an adjustable paper wrapping angle and a paper wrapping method thereof. Background Technology

[0002] The manufacturing process of copper cables generally includes: Raw material preparation: Select high-purity copper ore or recycled copper materials as raw materials.

[0003] Copper smelting: The process of processing copper ore or recycled copper materials through copper smelting technology, including ore beneficiation, leaching, smelting and refining, to obtain high-purity copper metal.

[0004] Continuous casting: The refined copper metal is melted and poured into a continuous casting machine through a continuous casting process, where it is quickly solidified into copper rods or copper billets.

[0005] Rolling: The copper rods or billets obtained from continuous casting are fed into a rolling mill for rolling, gradually reducing their cross-sectional area and size to form the required copper wire.

[0006] Drawing: The rolled copper wire is passed through a drawing machine and continuously through multiple dies, gradually reducing its diameter while increasing its length.

[0007] Annealing: The drawn copper wire needs to undergo annealing, which involves exposing it to high temperatures to rearrange the grains, eliminate internal stress, and improve its conductivity and flexibility.

[0008] Insulation: If it is necessary to prepare insulated copper cables, insulating materials such as polyethylene (PE), polyvinyl chloride (PVC) or cross-linked polyethylene (XLPE) can be coated on the surface of the copper wire.

[0009] Stranding: Stranding multiple insulated copper wires together according to a certain pattern to form a multi-core copper cable.

[0010] Packaging and Testing: The prepared copper cables are packaged and tested to ensure they meet relevant technical requirements and standards; When packaging copper cables, insulating paper is typically wrapped around them to complete the packaging. Current paper-wrapping machines generally work by rotating a turntable carrying the insulating paper around the copper cable. However, during the wrapping process, if the wrapping angle needs to be changed, the traditional machine must be stopped, and the adjusting roller must be changed to adjust the incident angle of the insulating paper. This manual adjustment method has the following disadvantages: 1. The paper wrapping machine needs to be stopped, which affects the paper wrapping efficiency; 2. Paper wrapping machines generally have multiple turntables with insulating paper, and each turntable is equipped with a set of adjusting rollers. Therefore, after adjusting the positions of multiple adjusting rollers, the positions of the adjusting rollers need to be consistent. Thus, it is necessary to measure the position of the adjusting rollers during adjustment, which affects the adjustment speed. Summary of the Invention

[0011] Purpose of the invention: To provide a paper wrapping machine with an adjustable paper wrapping angle and a paper wrapping method thereof, so as to solve the above-mentioned problems existing in the prior art.

[0012] Technical solution: A paper wrapping machine with adjustable wrapping angle, comprising: A paper wrapping cover, and a paper wrapping unit disposed within the paper wrapping cover; The paper wrapping unit includes two sets of symmetrically arranged paper wrapping mechanisms; Each paper-wrapping mechanism includes: The paper wrapping section includes four sets of paper wrapping components arranged in a circular pattern; The drive unit includes an adjustment drive connected to the paper wrapping unit, a rotating wheel connected to the adjustment drive, and a rotating shaft connected to the rotating wheel.

[0013] In a further embodiment, the adjustment drive includes: case; The proximal drive unit is disposed within the housing and includes a proximal motor connected to the housing, a proximal output gear sleeved on the output end of the proximal motor, and a proximal transmission gear meshing with the proximal output gear. The remote drive unit is disposed within the housing and includes a remote motor connected to the housing, a remote output gear sleeved on the output end of the remote motor, and a remote transmission gear meshing with the remote output gear. The distal drive gear and the proximal drive gear are arranged side by side, and a through slot is opened in the center to allow the copper cable to pass through.

[0014] This invention uses an adjustable drive unit to work with the paper wrapping unit to adjust the roller group. The near-end drive unit and the far-end drive unit drive the near-end screw and the far-end screw to rotate, thereby driving the near-end adjusting roller group and the far-end adjusting roller group to adjust their positions, thereby changing the wrapping angle of the insulating paper. Meanwhile, the near-end drive and the far-end drive are each a drive source that drives the near-end adjusting roller group and the far-end adjusting roller group in multiple paper wrapping parts to complete the adjustment, so that the movement distance of the adjusting roller group is consistent. Compared with the traditional adjustment method, there is no need to stop the machine or measure the position of the adjusting roller group.

[0015] In a further embodiment, the wheel is connected to the housing. A through groove is formed at the center of the housing, the wheel, and the shaft to allow a copper cable to pass through. In a further embodiment, the paper wrapping component includes: The paper tray is mounted on the housing; it rotates as the insulating paper is pulled and can be removed from the housing.

[0016] The tensioning roller assembly is located on the side of the paper tray near the housing, and includes a tensioning roller frame on the housing and a tensioning roller body located at the end of the tensioning roller frame. A spring is provided between the housing and the tensioning roller frame. The paper wrapping adjustment tube is connected to the housing and extends into the housing. The inside of the paper wrapping adjustment tube is hollow and the surface has a sliding groove. The near-end regulating roller assembly is sleeved on the paper-wrapping regulating tube and located on the paper-wrapping regulating tube near the paper-wrapping tray. It includes a near-end roller frame sleeved on the paper-wrapping regulating tube and a near-end roller body disposed at the end of the near-end roller frame. The remote adjusting roller assembly is sleeved on the paper-wrapping adjusting tube and located at the end of the paper-wrapping adjusting tube away from the paper-wrapping tray. It includes a remote roller frame sleeved on the paper-wrapping adjusting tube and a remote roller body disposed at the end of the remote roller frame. The traction rod is connected to the paper wrapping adjustment tube via a connecting frame and is located on one side of the paper wrapping adjustment tube.

[0017] In a further embodiment, the paper wrapping adjustment tube is provided with a proximal lead screw, and a proximal slide and a proximal input gear are sleeved on the proximal lead screw; The proximal carriage passes through the slide groove and is connected to the proximal roller frame; The proximal lead screw is hollow and has a distal lead screw inside. A distal slide and a distal input gear are fitted on the distal lead screw. The distal carriage passes through the slide groove and is connected to the distal roller frame; The length of the proximal lead screw is shorter than that of the distal lead screw.

[0018] The proximal lead screw, distal lead screw, and paper wrapping adjustment tube are interconnected by bearings. A bearing is fitted on the proximal lead screw and its outer ring is connected to the inner wall of the paper wrapping adjustment tube. A bearing is fitted on the distal lead screw and its outer ring is connected to the inner wall of the proximal lead screw.

[0019] In a further embodiment, the proximal input gear meshes with the proximal drive gear, and the distal input gear meshes with the distal drive gear.

[0020] In a further embodiment, the near-end roller frame and the far-end roller frame have a height difference.

[0021] In a further embodiment, the paper-wrapping cover is provided with a matching bearing frame, the bearing frame is provided with a matching bearing, and the matching bearing is sleeved on the rotating shaft; The paper-wrapping cover is equipped with a paper-wrapping motor, and the output end of the paper-wrapping motor is connected to the rotary wheel drive.

[0022] The transmission method can be belt drive, with a drive wheel fitted at the output end of the paper wrapping motor, and the transmission is completed by a belt fitted between the wheel and the drive wheel.

[0023] A paper wrapping method with an adjustable wrapping angle includes: Step 1: Wrap the insulating paper on the paper tray around the near-end roller, tension roller, far-end roller, and traction rod in sequence, and then wrap it around the copper cable; Step 2: During the paper wrapping process, the paper wrapping motor drives the rotating shaft to rotate, which in turn drives the insulating paper to wind around the copper cable, thus completing the paper wrapping. Step 3: During the paper wrapping process, when it is necessary to adjust the paper wrapping angle, the near-end motor drives the near-end output gear to rotate, which in turn drives the near-end transmission gear to rotate, which in turn drives the near-end input gear to rotate, which in turn drives the near-end lead screw to rotate, which in turn drives the near-end slide to move, which in turn drives the near-end roller frame to slide along the paper wrapping adjustment tube, which in turn drives the near-end roller body to move. Then, the remote motor drives the remote output gear to rotate, which in turn drives the remote transmission gear to rotate, which in turn drives the remote input gear to rotate, which in turn drives the remote lead screw to rotate, which in turn drives the remote slide to move, which in turn drives the remote roller frame to slide along the paper wrapping adjustment tube, which in turn drives the remote roller body to move. The wrapping angle of the insulating paper is adjusted by adjusting the near-end roller and the far-end roller.

[0024] During the paper wrapping process, the copper cable needs to move continuously, which can be accomplished by a traction mechanism or a winding mechanism.

[0025] Beneficial effects: This invention discloses a paper wrapping machine with an adjustable paper wrapping angle and a paper wrapping method thereof. This invention designs an adjusting drive component to cooperate with the paper wrapping component to complete the adjustment of the adjusting roller group. The near-end drive component and the far-end drive component drive the near-end screw and the far-end screw to rotate, thereby driving the near-end adjusting roller group and the far-end adjusting roller group to adjust their positions, thereby changing the paper wrapping angle of the insulating paper. Meanwhile, the near-end drive and the far-end drive are each a drive source that synchronously drives the near-end adjustment roller group and the far-end adjustment roller group in multiple paper wrapping parts to complete the adjustment, so that the movement distance of the adjustment roller group is consistent. Compared with the traditional adjustment method, there is no need to stop the machine or measure the position of the adjustment roller group. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the present invention.

[0027] Figure 2 This is a schematic diagram of the paper wrapping unit of the present invention.

[0028] Figure 3 This is a schematic diagram of the paper wrapping part structure of the present invention.

[0029] Figure 4This is a schematic diagram of the paper wrapping component structure of the present invention.

[0030] Figure 5 This is a schematic diagram of the internal structure of the adjustment drive component of the present invention.

[0031] Figure 6 This is a schematic diagram of the insulating paper winding method of the present invention.

[0032] The attached figures are labeled as follows: 1. Paper cover; 2. Paper wrapping unit; 21. Paper wrapping section; 211. Paper wrapping tray; 211A. Insulating paper; 212. Tensioning roller assembly; 213. Paper wrapping adjusting tube; 213A. Proximal lead screw; 213B. Proximal input gear; 213C. Distal lead screw; 213D. Distal input gear; 214. Proximal adjusting roller assembly; 215. Distal adjusting roller assembly; 216. Connecting frame; 217. Traction rod; 22. Drive unit; 221. Adjustment drive component; 221A. Distant drive gear; 221B. Proximal motor; 221C. Proximal output gear; 221D. Proximal drive gear; 221E. Distant motor; 222. Rotary wheel; 223. Rotating shaft; 3. Copper cable. Detailed Implementation

[0033] This application relates to an adjustable paper wrapping machine and a paper wrapping method thereof, which will be explained in detail below through specific embodiments.

[0034] A paper wrapping machine with adjustable wrapping angle, comprising: Paper wrapping cover 1, and paper wrapping unit 2 disposed inside the paper wrapping cover 1; The paper wrapping unit 2 includes two sets of symmetrically arranged paper wrapping mechanisms; Each paper-wrapping mechanism includes: The paper wrapping section 21 includes four sets of paper wrapping components arranged in a circular pattern; The drive unit 22 includes an adjustment drive 221 connected to the paper wrapping unit 21, a rotary wheel 222 connected to the adjustment drive 221, and a rotary shaft 223 connected to the rotary wheel 222.

[0035] The adjustment drive component 221 includes: case; The proximal drive unit is disposed within the housing and includes a proximal motor 221B connected to the housing, a proximal output gear 221C sleeved on the output end of the proximal motor 221B, and a proximal transmission gear 221D meshing with the proximal output gear 221C. The remote drive unit is disposed in the housing and includes a remote motor 221E connected to the housing, a remote output gear sleeved on the output end of the remote motor 221E, and a remote transmission gear 221A meshing with the remote output gear. The distal transmission gear 221A and the proximal transmission gear 221D are arranged side by side, and a through slot is opened in the center for the copper cable 3 to pass through.

[0036] The present invention uses an adjustable drive unit 221 to work with the paper wrapping unit to adjust the adjustable roller group. The near-end drive unit and the far-end drive unit drive the near-end lead screw 213A and the far-end lead screw 213C to rotate, thereby driving the near-end adjustable roller group 214 and the far-end adjustable roller group 215 to adjust their positions, thereby changing the wrapping angle of the insulating paper 211A. Meanwhile, the near-end drive and the far-end drive are each a drive source that drives the near-end adjusting roller group 214 and the far-end adjusting roller group 215 in multiple paper wrapping parts to complete the adjustment, so that the movement distance of the adjusting roller group is consistent. Compared with the traditional adjustment method, there is no need to stop the machine or measure the position of the adjusting roller group.

[0037] The rotating wheel 222 is connected to the housing. A through groove is formed at the center of the housing, the rotating wheel 222, and the rotating shaft 223 to allow the copper cable 3 to pass through. The paper wrapping component includes: The paper tray 211 is mounted on the housing; it can rotate as the insulating paper 211A is pulled and can be removed from the housing.

[0038] Tensioning roller assembly 212 is disposed on the side of the wrapping paper tray 211 near the housing, including a tensioning roller frame disposed on the housing and a tensioning roller body disposed at the end of the tensioning roller frame, and a spring is provided between the housing and the tensioning roller frame; The paper wrapping adjustment tube 213 is connected to the housing and extends into the housing. The inside of the paper wrapping adjustment tube 213 is hollow and the surface has a sliding groove. The near-end regulating roller assembly 214 is sleeved on the paper wrapping regulating tube 213 and located on the paper wrapping regulating tube 213 near the paper wrapping tray 211. It includes a near-end roller frame sleeved on the paper wrapping regulating tube 213 and a near-end roller body disposed at the end of the near-end roller frame. The remote adjusting roller assembly 215 is sleeved on the paper wrapping adjusting tube 213 and located at the end of the paper wrapping adjusting tube 213 away from the paper wrapping tray 211. It includes a remote roller frame sleeved on the paper wrapping adjusting tube 213 and a remote roller body disposed at the end of the remote roller frame. The traction rod 217 is connected to the paper wrapping adjustment tube 213 via the connecting frame 216 and is located on one side of the paper wrapping adjustment tube 213.

[0039] The paper wrapping adjustment tube 213 is provided with a proximal lead screw 213A, and a proximal slide and a proximal input gear 213B are sleeved on the proximal lead screw 213A; The proximal carriage passes through the slide groove and is connected to the proximal roller frame; The proximal lead screw 213A is hollow and has a distal lead screw 213C inside. A distal slide and a distal input gear 213D are fitted on the distal lead screw 213C. The distal carriage passes through the slide groove and is connected to the distal roller frame; The length of the proximal lead screw 213A is less than that of the distal lead screw 213C.

[0040] The proximal lead screw 213A, the distal lead screw 213C, and the paper wrapping adjustment tube 213 are interconnected by bearings. A bearing is fitted on the proximal lead screw 213A and the outer ring of the bearing is connected to the inner wall of the paper wrapping adjustment tube 213. A bearing is fitted on the distal lead screw 213C and the outer ring of the bearing is connected to the inner wall of the proximal lead screw 213A.

[0041] The proximal input gear 213B meshes with the proximal transmission gear 221D, and the distal input gear 213D meshes with the distal transmission gear 221A.

[0042] The near-end roller frame and the far-end roller frame have a height difference.

[0043] The paper cover 1 is provided with a matching bearing frame, the bearing frame is provided with a matching bearing, and the matching bearing is sleeved on the rotating shaft 223. The paper-wrapping cover 1 is equipped with a paper-wrapping motor, and the output end of the paper-wrapping motor is connected to the rotating wheel 222 for transmission.

[0044] The transmission method can be belt transmission, with a transmission wheel fitted at the output end of the paper wrapping motor, and the transmission is completed by fitting a belt between the rotating wheel 222 and the transmission wheel.

[0045] A paper wrapping method with an adjustable wrapping angle includes: Step 1: Wrap the insulating paper 211A on the paper tray 211 around the near end roller, tension roller, far end roller, and traction rod 217 in sequence, and then wrap it around the copper cable 3; Step 2: During the paper wrapping process, the paper wrapping motor drives the rotating shaft 223 to rotate, which in turn drives the insulating paper 211A to wind around the copper cable 3, thus completing the paper wrapping. Step 3: During the paper wrapping process, when it is necessary to adjust the paper wrapping angle, the near-end motor 221B drives the near-end output gear 221C to rotate, which in turn drives the near-end transmission gear 221D to rotate, which in turn drives the near-end input gear 213B to rotate, which in turn drives the near-end lead screw 213A to rotate, which drives the near-end slide to move, which in turn drives the near-end roller frame to slide along the paper wrapping adjustment tube 213, which in turn drives the near-end roller body to move. Then, the remote motor 221E drives the remote output gear to rotate, which drives the remote transmission gear 221A to rotate, which in turn drives the remote input gear 213D to rotate, which in turn drives the remote lead screw 213C to rotate, which drives the remote slide to move, which in turn drives the remote roller frame to slide along the paper wrapping adjustment tube 213, which in turn drives the remote roller body to move. The wrapping angle of the insulating paper 211A is adjusted by adjusting the near-end roller and the far-end roller.

[0046] During the paper wrapping process, the copper cable 3 needs to move continuously, which can be accomplished by a traction mechanism or a winding mechanism.

[0047] Working principle explanation: The insulating paper 211A on the paper tray 211 is passed around the near end roller, the tension roller, the far end roller, and the traction rod 217 in sequence, and then wound onto the copper cable 3; During the paper wrapping process, the paper wrapping motor drives the rotating shaft 223 to rotate, which in turn drives the insulating paper 211A to wind around the copper cable 3, thus completing the paper wrapping. During the paper wrapping process, when it is necessary to adjust the paper wrapping angle, the near-end motor 221B drives the near-end output gear 221C to rotate, which in turn drives the near-end transmission gear 221D to rotate, which in turn drives the near-end input gear 213B to rotate, which in turn drives the near-end lead screw 213A to rotate, which drives the near-end slide to move, which in turn drives the near-end roller frame to slide along the paper wrapping adjustment tube 213, which in turn drives the near-end roller body to move. Then, the remote motor 221E drives the remote output gear to rotate, which drives the remote transmission gear 221A to rotate, which in turn drives the remote input gear 213D to rotate, which in turn drives the remote lead screw 213C to rotate, which drives the remote slide to move, which in turn drives the remote roller frame to slide along the paper wrapping adjustment tube 213, which in turn drives the remote roller body to move. The wrapping angle of the insulating paper 211A is adjusted by adjusting the near-end roller and the far-end roller.

[0048] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and all such equivalent transformations fall within the protection scope of the present invention.

Claims

1. A paper wrapping machine with an adjustable wrapping angle, comprising: Paper wrapping cover (1), and paper wrapping unit (2) disposed inside the paper wrapping cover (1); The paper wrapping unit (2) is characterized in that it comprises two sets of symmetrically arranged paper wrapping mechanisms; Each paper-wrapping mechanism includes: The paper wrapping section (21) includes four sets of paper wrapping components arranged in a circular pattern; The drive unit (22) includes an adjustment drive (221) connected to the paper wrapping unit (21), a rotating wheel (222) connected to the adjustment drive (221), and a rotating shaft (223) connected to the rotating wheel (222). The adjustment drive (221) includes: case; The proximal drive unit is disposed within the housing and includes a proximal motor (221B) connected to the housing, a proximal output gear (221C) sleeved on the output end of the proximal motor (221B), and a proximal transmission gear (221D) meshing with the proximal output gear (221C). The remote drive unit is disposed within the housing and includes a remote motor (221E) connected to the housing, a remote output gear sleeved on the output end of the remote motor (221E), and a remote transmission gear (221A) meshing with the remote output gear. The paper wrapping component includes: A paper tray (211) is mounted on the housing; Tensioning roller assembly (212) is disposed on the side of the wrapping paper tray (211) near the housing, including a tensioning roller frame disposed on the housing and a tensioning roller body disposed at the end of the tensioning roller frame, and a spring is provided between the housing and the tensioning roller frame; The paper wrapping adjustment tube (213) is connected to the housing and extends into the housing. The inside of the paper wrapping adjustment tube (213) is hollow and the surface has a sliding groove. The near-end regulating roller assembly (214) is sleeved on the paper wrapping regulating tube (213) and located on the paper wrapping regulating tube (213) near the end of the paper wrapping tray (211). It includes a near-end roller frame sleeved on the paper wrapping regulating tube (213) and a near-end roller body disposed at the end of the near-end roller frame. The remote adjustment roller assembly (215) is sleeved on the paper wrapping adjustment tube (213) and located on the paper wrapping adjustment tube (213) at the end away from the paper wrapping tray (211). It includes a remote roller frame sleeved on the paper wrapping adjustment tube (213) and a remote roller body disposed at the end of the remote roller frame. The traction rod (217) is connected to the paper wrapping adjustment tube (213) via the connecting frame (216) and is located on one side of the paper wrapping adjustment tube (213); The paper wrapping adjustment tube (213) is provided with a proximal lead screw (213A), and a proximal slide and a proximal input gear (213B) are sleeved on the proximal lead screw (213A). The proximal carriage passes through the slide groove and is connected to the proximal roller frame; The proximal lead screw (213A) is hollow and has a distal lead screw (213C) inside. A distal slide and a distal input gear (213D) are fitted on the distal lead screw (213C). The distal carriage passes through the slide groove and is connected to the distal roller frame; The length of the proximal lead screw (213A) is less than that of the distal lead screw (213C); The proximal input gear (213B) meshes with the proximal transmission gear (221D), and the distal input gear (213D) meshes with the distal transmission gear (221A); the proximal roller frame and the distal roller frame have a height difference.

2. The paper wrapping machine with adjustable wrapping angle according to claim 1, characterized in that: The wheel (222) is connected to the housing.

3. The paper wrapping machine with adjustable wrapping angle according to claim 1, characterized in that: The paper cover (1) is provided with a matching bearing frame, the bearing frame is provided with a matching bearing, and the matching bearing is sleeved on the rotating shaft (223). The paper-wrapping cover (1) is equipped with a paper-wrapping motor, and the output end of the paper-wrapping motor is connected to the rotating wheel (222) for transmission.

4. A paper wrapping method with an adjustable paper wrapping angle, implemented based on a paper wrapping machine with an adjustable paper wrapping angle as described in any one of claims 1-3, characterized in that, include: Step 1: Wrap the insulating paper (211A) on the paper tray (211) around the near end roller, tension roller, far end roller, and traction rod (217) in sequence, and then wrap it around the copper cable (3); Step 2: During the paper wrapping process, the paper wrapping motor drives the rotating shaft (223) to rotate, which in turn drives the insulating paper (211A) to wind around the copper cable (3) to complete the paper wrapping. Step 3: During the paper wrapping process, when it is necessary to adjust the paper wrapping angle, the near-end motor (221B) drives the near-end output gear (221C) to rotate, which in turn drives the near-end transmission gear (221D) to rotate, which in turn drives the near-end input gear (213B) to rotate, which in turn drives the near-end lead screw (213A) to rotate, which in turn drives the near-end slide to move, which in turn drives the near-end roller frame to slide along the paper wrapping adjustment tube (213), which in turn drives the near-end roller body to move. Then, the remote motor (221E) drives the remote output gear to rotate, which in turn drives the remote transmission gear (221A) to rotate, which in turn drives the remote input gear (213D) to rotate, which in turn drives the remote lead screw (213C) to rotate, which in turn drives the remote slide to move, which in turn drives the remote roller frame to slide along the paper wrapping adjustment tube (213), which in turn drives the remote roller body to move. The wrapping angle of the insulating paper (211A) is adjusted by adjusting the near-end roller and the far-end roller.

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