Adjustable steel plate rolling mill roller
By introducing lifting components and driving components into the rolling rolls of the steel plate mill, the problem of inconvenient adjustment of roll spacing is solved, the efficiency and quality of steel plate processing is improved, and the stability and convenience of rolling rolls under different steel plate thicknesses are ensured.
Patent Information
- Application Number
- CN202421034097.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-13
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-05-13
AI Technical Summary
During the rolling process of existing rolling mills, the roll spacing cannot be adjusted accurately according to different steel plate thicknesses, resulting in uneven extrusion pressure, reducing processing efficiency and affecting product quality.
An adjustable steel plate rolling roll is designed, including a bottom plate, an upper roll, a first roll shaft, a lower roll and a second roll shaft. It adopts a lifting assembly, a driving assembly and a locking assembly to realize the upper rolling roll by electric push rod and motor drive. Height adjustment and rotation ensure flexible adjustment and stability of roll spacing.
It realizes rapid adjustment of the thickness of the steel plate, improves processing efficiency and quality, and ensures the stability and convenience of the upper roll during the processing process.
Smart Images
Figure CN222268221U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of steel plate rolling mill rollers, in particular to an adjustable steel plate rolling mill roller. Background Art
[0002] Rollers are the main working parts and tools on the rolling mill that cause continuous plastic deformation of metal. Rollers are mainly composed of three parts: roll body, roll neck and shaft head. The roll body is the middle part of the roll that actually participates in rolling metal. It has a smooth cylindrical or grooved surface. Rollers can be arranged in the form of two rolls, three rolls, four rolls or multiple rolls in the rolling mill frame. The rolling mill is a key equipment for steel rolling. Short-stress rolling mills are widely used because of their long service life and easy replacement of roll bearings. At present, the short-stress rolling mills used for rolling metal plates have the same roll body length for the working rolls and support rolls. The two ends of the working rolls are fixed and cannot be moved. During the rolling process of the rolling mill, it is usually necessary to control the edge waves of the steel plate by adjusting the height of the upper and lower drive rolls.
[0003] When existing rollers roll steel plates of different thicknesses in a steel rolling mill, the rollers basically have no adjustment function, so the steel plates are subjected to different extrusion pressures, and it is impossible to ensure that the same extrusion pressure is applied to different steel plates, thereby reducing processing efficiency. In addition, the structures of roller adjustment mechanisms on the market are relatively complex. During the adjustment process, the distance between the two rollers cannot be accurately adjusted according to the thickness of different steel plates, which is prone to operational errors, thereby greatly affecting product quality.
[0004] Based on this, an adjustable steel plate rolling mill roll is now provided, which can eliminate the disadvantages of the existing device. Utility Model Content
[0005] The utility model aims to provide an adjustable steel plate rolling mill roll to solve the problems in the background technology.
[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0007] An adjustable steel plate rolling mill roller comprises a bottom plate, an upper roller, a first roller shaft, a lower roller and a second roller shaft, a plurality of legs are provided at the lower end of the bottom plate, first roller shafts are provided at both ends of the upper roller, second roller shafts are provided at both ends of the lower roller, a lifting assembly for adjusting the height of the upper roller is provided at the upper end of the bottom plate, and a moving assembly for moving the device is provided at the lower end of the bottom plate, a driving assembly for driving the upper roller to rotate and a locking assembly for improving the stability of the upper roller when processing the steel plate are respectively provided on the lifting assembly, the upper roller is rotatably arranged on the driving assembly through the first roller shaft, and the lower roller is rotatably arranged on the lifting assembly through the second roller shaft.
[0008] On the basis of the above technical solutions, the present invention also provides the following optional technical solutions:
[0009] In an optional scheme: the lifting assembly includes two support plates, the two support plates are symmetrically arranged on the upper end of the base plate, two rectangular windows are symmetrically penetrated on the support plates, and a first through slot is penetrated in the middle position of the support plates, a sliding rod and a lifting block are provided in the first through slot, the lifting block is inserted on the sliding rod, the upper end of the sliding rod is fixedly connected to the top end of the first through slot, and the lower end of the sliding rod is fixedly connected to the bottom end of the first through slot, a connecting plate is provided at one end of the lifting block facing the upper roller, and the bottom of the end of the lifting block away from the upper roller is fixedly connected to the lifting plate, two electric push rods are provided at the lower end of the lifting plate, the output end of the electric push rod is fixedly connected to the lifting plate, the electric push rod is arranged at the upper end of the base plate, and the lower roller is rotatably arranged on the support plate through the second roller shaft.
[0010] In an optional scheme: the driving assembly includes a support plate and a first belt, a first motor is provided on the support plate, a rotating shaft is fixedly provided on the first motor, a first pulley is provided on the end of the rotating shaft away from the first motor, a second pulley is provided on the first roller shaft, the first pulley is connected to the second pulley through a first belt, and the upper roller is rotatably arranged on the connecting plate through the first roller shaft.
[0011] In an optional scheme: the locking assembly includes a fixing plate, which is arranged in the rectangular window, and a pull rod is inserted in the middle position of the fixing plate, a pull cap is provided at one end of the pull rod, and a mounting plate is provided at the other end of the pull rod, a spring is provided on the pull rod outer sleeve, one end of the spring is fixedly connected to the fixing plate, and the other end of the spring is fixedly connected to the mounting plate, and a plurality of pressure blocks arranged longitudinally are provided at the end of the mounting plate away from the spring, a first wedge surface is provided at the top of the pressure block, second through grooves are penetrated at the inner walls at both ends of the first through groove, the first through groove is connected to the rectangular window through the second through groove, a lower pressure block is slidably provided in the second through groove, the end of the lower pressure block away from the rectangular window is fixedly connected to the lifting block, and the bottom end of the lower pressure block is provided with a second wedge surface matching the first wedge surface.
[0012] In an optional scheme: the moving component includes a second motor, a second belt and a fixed frame, a rotating rod is fixedly provided at the output end of the second motor, one end of the rotating rod passes through the bottom plate and is fixedly connected to the third pulley, the fixed frame is arranged at the lower end of the bottom plate, and a moving plate is slidably provided inside the fixed frame, two screws are symmetrically provided on the moving plate, the two screws pass through the moving plate and are threadedly connected thereto, a fixing sleeve is fixedly provided on the outer surfaces of the two screws, the two fixing sleeves are transmission-connected to the third pulley through the second belt, a plurality of moving wheels are provided at the lower end of the moving plate, limiting grooves are provided at both ends of the inner wall of the fixed frame, limiting rods are slidably provided in the two limiting grooves, and the two limiting rods are respectively arranged at both ends of the moving plate.
[0013] In an optional solution: an anti-slip pad is provided at the lower end of the supporting leg.
[0014] In an optional solution: a reinforcing plate is provided at one end of the support plate away from the upper roller, and the bottom end of the reinforcing plate is fixedly arranged on the bottom plate.
[0015] In an optional solution: a scale is provided at one end of the support plate away from the upper roller.
[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:
[0017] 1. The utility model can quickly and conveniently realize the lifting and lowering of the upper roller through the lifting component, so that the device can adjust the distance between the upper roller and the lower roller according to the thickness of the steel plate when processing the steel plate, thereby improving the processing efficiency and processing quality of the steel plate, and under the action of the locking component, the position of the upper roller that has completed the height adjustment can be fixed, thereby improving the stability of the upper roller when processing the steel plate, and further improving the processing quality of the steel plate.
[0018] 2. The utility model can quickly and conveniently make the first roller drive the upper roller to rotate through the driving component, so that the upper roller and the lower roller can cooperate with each other to process the plate, thereby improving the convenience of processing the steel plate.
[0019] 3. The utility model can quickly and conveniently move and fix the device through the cooperation between the bottom plate and the moving assembly, and the universal wheels can be freely retracted and extended, thereby improving the flexibility of the movement of the device. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 A structural schematic diagram of one side of the utility model.
[0021] Figure 2 It is a schematic diagram of the structure of the utility model from a top view angle.
[0022] Figure 3 It is a schematic diagram of the structure of the utility model from an upward viewing angle.
[0023] Figure 4 It is a structural schematic diagram of the drive assembly of the utility model.
[0024] Figure 5 For this utility model Figure 1 Schematic diagram of the structure of part A.
[0025] Figure 6 It is a structural schematic diagram of the locking assembly of the utility model.
[0026] Figure 7 It is a cross-sectional view of the support plate in the utility model.
[0027] Figure 8 It is a structural schematic diagram of the mobile component of the utility model.
[0028] Figure numerals: 100, bottom plate; 101, support leg; 102, anti-skid pad; 103, upper roller; 104, first roller shaft; 105, lower roller; 106, second roller shaft; 107, reinforcing plate; 108, scale; 200, lifting assembly; 201, support plate; 202, rectangular window; 203, first through slot; 204, slide bar; 205, lifting block; 206, connecting plate; 207, lifting plate; 208, electric push rod; 300, driving assembly; 301, support plate; 302, first motor; 303, rotating shaft; 304, first pulley; 305, first Belt; 306, second pulley; 400, locking assembly; 401, fixed plate; 402, pull rod; 403, pull cap; 404, spring; 405, mounting plate; 406, pressure block; 407, lower pressure block; 408, second through groove; 409, first wedge surface; 410, second wedge surface; 500, moving assembly; 501, second motor; 502, rotating rod; 503, second belt; 504, third pulley; 505, screw; 506, moving plate; 507, limiting rod; 508, moving wheel; 509, fixing sleeve; 510, limiting groove; 511, fixing frame. DETAILED DESCRIPTION
[0029] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.
[0030] In one embodiment, Figure 1-Figure 8As shown, an adjustable steel plate rolling mill roller comprises a bottom plate 100, an upper roller 103, a first roller shaft 104, a lower roller 105 and a second roller shaft 106. A plurality of legs 101 are provided at the lower end of the bottom plate 100. Both ends of the upper roller 103 are provided with a first roller shaft 104, and both ends of the lower roller 105 are provided with a second roller shaft 106. A lifting component 200 is provided at the upper end of the bottom plate 100 for adjusting the height of the upper roller 103, and a moving component 500 is provided at the lower end of the bottom plate 100 for moving the device. A driving component 300 and a locking component 400 are provided on the lifting component 200, which are respectively used to drive the upper roller 103 to rotate and improve the stability of the upper roller 103 when processing the steel plate. The upper roller 103 is rotatably arranged on the driving component 300 through the first roller shaft 104, and the lower roller 105 is rotatably arranged on the lifting component 200 through the second roller shaft 106.
[0031] like Figure 1-Figure 6 As shown, the lifting assembly 200 includes two support plates 201, the two support plates 201 are symmetrically arranged at the upper end of the bottom plate 100, the support plates 201 are symmetrically penetrated with two rectangular windows 202, and the middle position of the support plates 201 is penetrated with a first through slot 203, a slide bar 204 and a lifting block 205 are arranged in the first through slot 203, the lifting block 205 is inserted on the slide bar 204, the upper end of the slide bar 204 is fixedly connected to the top end of the first through slot 203, and the lower end of the slide bar 204 is fixedly connected to the bottom end of the first through slot 203, and the lifting block 205 faces the upper roller 10 3 is provided with a connecting plate 206, and the bottom of the lifting block 205 away from the upper roller 103 is fixedly connected to the lifting plate 207, and two electric push rods 208 are provided at the lower end of the lifting plate 207, and the output end of the electric push rod 208 is fixedly connected to the lifting plate 207, and the electric push rod 208 is arranged on the upper end of the bottom plate 100. By turning on the electric push rod 208, the lifting plate 207 is moved up or down, thereby driving the lifting block 205 and the connecting plate 206 on the lifting block 205 to move up or down, and the lower roller 105 is rotatably arranged on the support plate 201 through the second roller shaft 106.
[0032] like Figure 1-Figure 4As shown, the driving assembly 300 includes a support plate 301 and a first belt 305, the support plate 301 is provided with a first motor 302, the first motor 302 is fixedly provided with a rotating shaft 303, the rotating shaft 303 is provided with a first pulley 304 at one end away from the first motor 302, the first roller shaft 104 is provided with a second pulley 306, the first pulley 304 is connected to the second pulley 306 through the first belt 305, the upper roller 103 is rotatably arranged on the connecting plate 206 through the first roller shaft 104, the first pulley 304 is rotated by turning on the first motor 302, and under the action of the first belt 305, the second pulley 306 starts to rotate, driving the first roller shaft 104 to rotate, and finally the upper roller 103 starts to rotate.
[0033] like Figure 1-Figure 7 As shown, the locking assembly 400 includes a fixing plate 401, which is arranged in the rectangular window 202, and a pull rod 402 is inserted in the middle position of the fixing plate 401, a pull cap 403 is provided at one end of the pull rod 402, and a mounting plate 405 is provided at the other end of the pull rod 402, a spring 404 is provided on the outer sleeve of the pull rod 402, one end of the spring 404 is fixedly connected to the fixing plate 401, and the other end of the spring 404 is fixedly connected to the mounting plate 405, a plurality of longitudinally arranged pressure blocks 406 are provided at one end of the mounting plate 405 away from the spring 404, a first wedge surface 409 is provided at the top of the pressure block 406, second through grooves 408 are penetrated at the inner walls of the left and right ends of the first through groove 203, the first through groove 203 is connected to the rectangular window 202 through the second through groove 408, and a lower through groove 408 is provided in the second through groove 408 for sliding The pressing block 407 has one end away from the rectangular window 202 and is fixedly connected to the lifting block 205. The bottom end of the pressing block 407 is provided with a second wedge surface 410 which cooperates with the first wedge surface 409. If the lifting block 205 moves downward, the pressing block 407 starts to move downward. Under the action of the first wedge surface 409 and the second wedge surface 410, multiple pressure blocks 406 move in a direction away from the pressing block 407. When the upper roller 103 moves downward to a suitable position, the pressing block 407 stops moving. Under the action of the spring 404, multiple pressure blocks 406 return to their original positions and fix the position of the pressing block 407 at the same time, thereby fixing the position of the lifting block 205, thereby improving the stability of the upper roller 103 when processing the steel plate. If the lifting block 205 moves upward, it is only necessary to pull the pull cap 403 outward while the lifting plate 207 moves upward.
[0034] like Figure 1 , Figure 2 , Figure 3 and Figure 8As shown, the moving assembly 500 includes a second motor 501, a second belt 503 and a fixed frame 511, a rotating rod 502 is fixedly provided at the output end of the second motor 501, one end of the rotating rod 502 passes through the bottom plate 100 and is fixedly connected to the third pulley 504, the fixed frame 511 is arranged at the lower end of the bottom plate 100, and a moving plate 506 is slidably provided inside the fixed frame 511, two screws 505 are symmetrically provided on the moving plate 506, the two screws 505 pass through the moving plate 506 and are threadedly connected thereto, the outer surfaces of the two screws 505 are fixedly provided with fixed sleeves 509, the two fixed sleeves 509 are transmission-connected to the third pulley 504 through the second belt 503, and by opening The second motor 501 causes the third pulley 504 to start rotating. Under the action of the second belt 503, the third pulley 504 rotates to drive the fixed sleeve 509 to rotate, thereby driving the screw 505 to rotate. A plurality of moving wheels 508 are provided at the lower end of the moving plate 506. Limiting grooves 510 are provided at both ends of the inner wall of the fixed frame 511. Limiting rods 507 are slidably provided in the two limiting grooves 510. The two limiting rods 507 are respectively arranged at both ends of the moving plate 506. The rotation of the screw 505 causes the moving plate 506 to start moving upward or downward, thereby causing the moving wheel 508 to start moving upward or downward. The cooperation between the limiting rods 507 and the limiting grooves 510 makes the moving plate 506 more stable when moving.
[0035] like Figure 1-Figure 3 As shown, an anti-skid pad 102 is provided at the lower end of the supporting leg 101, and the anti-skid pad 102 makes the device more stable when in use.
[0036] like Figure 1-Figure 2 As shown, a reinforcing plate 107 is provided at one end of the support plate 201 away from the upper roller 103, and the bottom end of the reinforcing plate 107 is fixedly arranged on the bottom plate 100. The reinforcing plate 107 makes the support plate 201 more stable, avoiding the situation where the support plate 201 shakes when the device is used.
[0037] like Figure 5 As shown, a scale 108 is provided at one end of the support plate 201 away from the upper roller 103. The scale 108 improves the accuracy of controlling the position of the upper roller 103 when it is raised or lowered, thereby better enabling the upper roller 103 to move to a required position according to the thickness of the steel plate.
[0038] The above embodiment discloses an adjustable steel plate rolling mill roller, wherein when in use, if the device needs to be moved, the third pulley 504 starts to rotate by turning on the second motor 501, and under the action of the second belt 503, the third pulley 504 rotates to drive the fixed sleeve 509 to rotate, thereby driving the screw 505 to rotate, and the screw 505 rotates to cause the movable plate 506 to start moving downward, thereby causing the movable wheel 508 to move downward until the movable wheel 508 leaves the fixed frame 511, and finally the device can be moved. When the device moves to the required position, the first motor 302 is turned on to cause the first pulley 304 to rotate, and under the action of the first belt 305, the second pulley 306 starts to rotate, driving the first roller shaft 104 to rotate, thereby causing the upper roller 103 to start rotating, and finally the upper roller 103 and the lower roller 105 cooperate with each other to process the plate. When the height of the upper roller 103 is adjusted, if the upper roller 103 needs to move downward, the electric push rod 208 is turned on to cause the lifting plate 207 to rotate. The lifting block 205 moves downward, thereby driving the lifting block 205 to move downward, and then driving the upper roller 103 on the connecting plate 206 to move downward, and the lifting block 205 moves downward so that the lower pressing block 407 starts to move downward. Under the action of the first wedge surface 409 and the second wedge surface 410, the multiple pressure blocks 406 move in the direction away from the lower pressing block 407. When the upper roller 103 moves downward to a suitable position, the lower pressing block 407 stops moving. Under the action of the spring 404, the multiple pressure blocks 406 return to their original positions, and at the same time, the lower pressing block 407 is pressed downward. The position is fixed, thereby fixing the position of the lifting block 205, thereby improving the stability of the upper roller 103 when processing the steel plate. If the upper roller 103 needs to move upward, it is only necessary to pull the pull cap 403 outward while controlling the lifting plate 207 to move upward through the electric push rod 208. When the upper roller 103 moves up to a suitable position, stop pulling the pull cap 403, and the multiple pressure blocks 406 return to their original positions, and fix the position of the lower pressure block 407, thereby completing the fixation of the position of the lifting block 205.
[0039] The above is only a specific implementation of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.
Claims
1. An adjustable steel plate rolling mill roll, comprising a bottom plate (100), an upper rolling roll (103), a first rolling shaft (104), a lower rolling roll (105) and a second rolling shaft (106), wherein a plurality of legs (101) are provided at the lower end of the bottom plate (100), the first rolling shaft (104) is provided at both ends of the upper rolling roll (103), and the second rolling shaft (106) is provided at both ends of the lower rolling roll (105), characterized in that: A lifting assembly (200) for adjusting the height of an upper roller (103) is provided at the upper end of the bottom plate (100), and a moving assembly (500) for enabling the device to move is provided at the lower end of the bottom plate (100). A driving assembly (300) for driving the upper roller (103) to rotate and a locking assembly (400) for improving the stability of the upper roller (103) when processing a steel plate are provided on the lifting assembly (200). The upper roller (103) is rotatably arranged on the driving assembly (300) via a first roller shaft (104), and the lower roller (105) is rotatably arranged on the lifting assembly (200) via a second roller shaft (106).
2. The adjustable steel plate rolling mill roll according to claim 1, characterized in that: The lifting assembly (200) comprises two support plates (201), the two support plates (201) are symmetrically arranged on the upper end of the bottom plate (100), two rectangular windows (202) are symmetrically penetrated on the support plates (201), and a first through slot (203) is penetrated in the middle of the support plates (201), a slide bar (204) and a lifting block (205) are arranged in the first through slot (203), the lifting block (205) is inserted on the slide bar (204), the upper end of the slide bar (204) is fixedly connected to the top end of the first through slot (203), and the lower end of the slide bar (204) is fixedly connected to the first through slot (203). The bottom end of the through groove (203) is fixedly connected, one end of the lifting block (205) facing the upper roller (103) is provided with a connecting plate (206), and the bottom of one end of the lifting block (205) away from the upper roller (103) is fixedly connected to a lifting plate (207), two electric push rods (208) are provided at the lower end of the lifting plate (207), and the output end of the electric push rod (208) is fixedly connected to the lifting plate (207), and the electric push rod (208) is arranged on the upper end of the bottom plate (100), and the lower roller (105) is rotatably arranged on the support plate (201) through the second roller shaft (106).
3. The adjustable steel plate rolling mill roll according to claim 2, characterized in that: The driving assembly (300) comprises a support plate (301) and a first belt (305); a first motor (302) is provided on the support plate (301); a rotating shaft (303) is fixedly provided on the first motor (302); a first pulley (304) is provided on one end of the rotating shaft (303) away from the first motor (302); a second pulley (306) is provided on the first roller shaft (104); the first pulley (304) is transmission-connected to the second pulley (306) via a first belt (305); and the upper roller (103) is rotatably arranged on a connecting plate (206) via the first roller shaft (104).
4. The adjustable steel plate rolling mill roll according to claim 2, characterized in that: The locking assembly (400) comprises a fixing plate (401), the fixing plate (401) is arranged in a rectangular window (202), a pull rod (402) is inserted in the middle of the fixing plate (401), one end of the pull rod (402) is provided with a pull cap (403), and the other end of the pull rod (402) is provided with a mounting plate (405), a spring (404) is provided on the outer sleeve of the pull rod (402), one end of the spring (404) is fixedly connected to the fixing plate (401), and the other end of the spring (404) is fixedly connected to the mounting plate (405), and the mounting plate (405) is provided with a plurality of A pressure block (406) is arranged in a longitudinal direction, a first wedge surface (409) is provided at the top of the pressure block (406), a second through groove (408) is penetrated at the inner walls of the left and right ends of the first through groove (203), the first through groove (203) is connected with the rectangular window (202) through the second through groove (408), a lower pressure block (407) is slidably provided in the second through groove (408), the end of the lower pressure block (407) away from the rectangular window (202) is fixedly connected to the lifting block (205), and the bottom end of the lower pressure block (407) is provided with a second wedge surface (410) matched with the first wedge surface (409).
5. The adjustable steel plate rolling mill roll according to claim 1, characterized in that: The moving assembly (500) comprises a second motor (501), a second belt (503) and a fixed frame (511); a rotating rod (502) is fixedly provided at the output end of the second motor (501); one end of the rotating rod (502) passes through the bottom plate (100) and is fixedly connected to the third pulley (504); the fixed frame (511) is arranged at the lower end of the bottom plate (100); a moving plate (506) is slidably provided inside the fixed frame (511); two screw rods (505) are symmetrically provided on the moving plate (506); the two screw rods (505) pass through the bottom plate (100); The movable plate (506) is passed through and threadedly connected thereto. The outer surfaces of the two screw rods (505) are fixedly provided with fixing sleeves (509). The two fixing sleeves (509) are transmission-connected to the third pulley (504) through the second belt (503). A plurality of movable wheels (508) are provided at the lower end of the movable plate (506). Both ends of the inner wall of the fixing frame (511) are provided with limiting grooves (510). Limiting rods (507) are slidably provided in the two limiting grooves (510). The two limiting rods (507) are respectively provided at both ends of the movable plate (506).
6. The adjustable steel plate rolling mill roll according to claim 1, characterized in that: An anti-slip pad (102) is provided at the lower end of the supporting leg (101).
7. The adjustable steel plate rolling mill roll according to claim 2, characterized in that: A reinforcing plate (107) is provided at one end of the support plate (201) away from the upper roller (103), and the bottom end of the reinforcing plate (107) is fixedly arranged on the bottom plate (100).
8. The adjustable steel plate rolling mill roll according to claim 2, characterized in that: A scale (108) is provided at one end of the support plate (201) away from the upper roller (103).