Printing equipment compatible with gravure printing and flexographic printing

Abstract

The invention provides a printing device compatible with gravure and flexography, which comprises a lower wallboard assembly, a plate roller assembly and a pressing rubber roller mechanism, the plate roller assembly is arranged on the lower wallboard assembly and comprises a plate roller cylinder, and the plate roller cylinder adopts a gravure plate roller or a flexography plate roller; the pressing rubber roller mechanism is arranged on the lower wall plate assembly and located above the plate roller assembly and comprises a matching roller, and a gravure coining rubber roller or a metal printing roller is adopted as the matching roller. The device further comprises a scraper assembly or a flexographic printing unit assembly. According to the printing equipment, the gravure printing roller or the flexographic printing roller which can be replaced with each other is arranged, the gravure coining rubber roller or the metal printing roller which can be replaced with each other and the scraper assembly or the flexographic printing unit assembly which can be replaced with each other are correspondingly arranged, replacement of gravure printing and flexographic printing is achieved, and printing machines of different formats are prevented from being purchased; the cost is reduced, and meanwhile, the occupied area is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of printing equipment, in particular to a printing equipment compatible with gravure printing and flexographic printing. Background Art

[0002] Gravure and flexographic printing are two different printing methods, each with its own advantages and disadvantages, and each with its own suitable printing areas. At present, printing machines, whether gravure or flexographic, are all single printing methods, either flexographic printing or gravure printing. Therefore, according to the needs, different printing machines must be used, and gravure and flexographic printing machines need to be purchased at the same time, which greatly increases the cost and floor space.

[0003] In view of this, the inventor specially designed a printing device that is compatible with gravure printing and flexographic printing, and this case was thus generated. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present invention is to provide a printing device that can be compatible with gravure printing and flexographic printing on the same printing press base, by providing mutually replaceable gravure plate rollers or flexographic plate rollers, correspondingly providing mutually replaceable gravure embossing rubber rollers or metal printing rollers and mutually replaceable scraper assemblies or flexographic printing unit assemblies, so as to realize the replacement of gravure printing and flexographic printing, and overcome the disadvantages of the current printing presses with a single printing mode.

[0005] A printing device compatible with gravure printing and flexographic printing is provided according to the present invention, comprising: Lower wall panel assembly; A printing plate roller assembly, which is arranged on the lower wall plate assembly and comprises a printing plate roller cylinder, and the printing plate roller cylinder is a gravure printing plate roller or a flexographic printing plate roller; A laminating rubber roller mechanism, which is arranged on the lower wallboard assembly and located above the plate roller assembly, and comprises a matching roller, wherein the matching roller is a gravure embossing rubber roller or a metal printing roller; and: a scraper assembly, the scraper assembly being arranged on the lower wall assembly and arranged side by side with the pressing roller mechanism; or A flexographic printing unit assembly, wherein the flexographic printing unit assembly is arranged on the lower wall assembly and arranged side by side with the plate roller assembly; The plate roller adopts a gravure plate roller, the corresponding matching roller adopts a gravure embossing rubber roller, and a scraper assembly is arranged on the lower wall panel assembly; the plate roller adopts a flexographic plate roller, the corresponding matching roller adopts a metal printing roller, and a flexographic printing unit assembly is arranged on the lower wall panel assembly.

[0006] The printing equipment of the present invention realizes the replacement of gravure printing and flexographic printing by providing interchangeable gravure plate rollers or flexographic plate rollers, correspondingly providing interchangeable gravure embossing rubber rollers or metal printing rollers and interchangeable scraper assemblies or flexographic printing unit assemblies, thereby avoiding the purchase of printing machines with different formats, reducing costs, and reducing the floor space.

[0007] In some embodiments of the present invention, the plate roller assembly comprises: First bracket; A plate roller shaft, the plate roller shaft is rotatably connected to the first bracket; A first limiting seat, wherein the first limiting seat is sleeved on the plate roller shaft; A second limiting seat, wherein the second limiting seat is sleeved on the plate roller shaft; A limiting device, the limiting device is arranged on the second limiting seat and is detachably connected to the first bracket; The plate roller is sleeved on the plate roller shaft and is located between the first limiting seat and the second limiting seat; the limiting device and the second limiting seat are removed in sequence or simultaneously to replace the plate roller.

[0008] In some embodiments of the present invention, the first bracket includes a first bottom plate and two first vertical plates disposed on the first bottom plate and arranged side by side.

[0009] In some embodiments of the present invention, a first driving device is disposed on a side of the first bracket away from the limiting device.

[0010] In some embodiments of the present invention, the two first vertical plates and the first bottom plate are overall U-shaped, the first driving device is arranged on the outer side of one of the first vertical plates and is used to drive the plate roller shaft to rotate and drive the plate roller to rotate, and the limiting device is arranged on the other first vertical plate and is detachably connected to the first vertical plate.

[0011] In some embodiments of the present invention, a plate roller gear is further provided on one end surface of the plate roller, and a avoidance hole is provided inside the plate roller gear, and the inner diameter of the avoidance hole is larger than the maximum outer diameter of the first limiting seat.

[0012] In some embodiments of the present invention, the limiting device includes: A first flange, embedded in the first bracket; A second flange, disposed on the first flange; The first bearing is sleeved on the second limiting seat and is located in the second flange.

[0013] In some embodiments of the present invention, a pressing rubber roller mechanism is further included above the plate roller assembly, and the pressing rubber roller mechanism includes: Support plate; A second bracket, disposed below the support plate and movable in a vertical direction; A second driving device, disposed on the support plate and used to drive the second bracket to move along a vertical direction; A rubber roller shaft, which is disposed on the second bracket and has two ends detachably connected to the second bracket; The matching roller is arranged on the rubber roller shaft and is used in conjunction with the plate roller.

[0014] In some embodiments of the present invention, a groove for accommodating the rubber roller shaft is provided on the second bracket, and a fixing seat for confining the rubber roller shaft in the groove is provided at the opening of the groove.

[0015] In some embodiments of the present invention, the groove is U-shaped, and its opening faces the side wall of the second bracket.

[0016] In some embodiments of the present invention, one end of the fixing seat is rotatably connected to the second bracket, and the other end is detachably connected to the second bracket.

[0017] In some embodiments of the present invention, a threaded hole is further provided on the fixing seat, and a bolt is threadedly connected to the fixing seat to abut against the outer side wall of the rubber roller shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0019] in: Figure 1 The structure of the printing device compatible with gravure printing and flexographic printing of the present invention is shown in FIG. Figure 1 ; Figure 2 The structure of the printing device compatible with gravure printing and flexographic printing of the present invention is shown in FIG. Figure 2 ; Figure 3 It is a structural schematic diagram of the plate roller assembly of the present invention; Figure 4 The exploded view of the plate roller assembly of the present invention is Figure 1 ; Figure 5 The exploded view of the plate roller assembly of the present invention is Figure 2 ; Figure 6 is a side view of the plate roller assembly of the present invention; Figure 7 The present invention Figure 6 Sectional view AA; Figure 8 The present invention Figure 7 A partial enlarged view of Fig. 9 It is a structural schematic diagram of the pressing roller mechanism of the present invention; Fig.10 is a side view of the pressing roller mechanism of the present invention; Fig.11 The present invention Fig.10 Sectional view BB.

[0020] Description of labels: 10. Lower wall panel assembly; 20. Plate roller assembly; 21. First bracket; 211. First bottom plate; 212. First vertical plate; 2121. Support column; 2122. First fixing member; 22. Plate roller shaft; 23. First limiting seat; 24. Second limiting seat; 25. Plate roller; 251. Plate roller gear; 26. Limiting device; 261. First flange; 2611. First handle; 262. Second flange; 263. First bearing; 264. Guide cover; 27. First driving device; 28. Transition cone sleeve; 30. Pressing roller mechanism; 31. Support plate; 32. Second bracket; 321. Groove; 33. Second driving device; 34. Rubber roller shaft; 35. Matching roller; 36. Fixed seat; 37. Second bearing; 38. Limiting ring; 40. Scraper assembly; 50. Flexographic printing unit assembly. DETAILED DESCRIPTION

[0021] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer and more understandable, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0022] See also Figures 1 to 11, is a printing device compatible with gravure printing and flexographic printing as embodiment 1 of the present invention, including a lower wall panel assembly 10, a plate roller assembly 20, and a pressing rubber roller mechanism, wherein the plate roller assembly 20 is arranged on the lower wall panel assembly 10, including a plate roller 25, and the plate roller 25 adopts a gravure plate roller or a flexographic plate roller; the pressing rubber roller mechanism is arranged on the lower wall panel assembly 10 and is located above the plate roller assembly 20, including a matching roller 35, and the matching roller 35 adopts a gravure embossing rubber roller or a metal printing roller; it also includes a scraper assembly 40 or a flexographic printing unit assembly 50 (i.e., anilox roller assembly), the scraper assembly 40 is arranged on the lower wall assembly and arranged side by side with the pressing roller mechanism 30; the flexographic printing unit assembly 50 is arranged on the lower wall assembly and arranged side by side with the plate roller assembly 20 Setting: the plate roller 25 adopts a gravure plate roller, the corresponding matching roller 35 adopts a gravure embossing rubber roller, and a scraper assembly 40 is arranged on the lower wall panel assembly 10; the plate roller 25 adopts a flexographic plate roller, the corresponding matching roller 35 adopts a metal printing roller, and a flexographic printing unit assembly 50 is arranged on the lower wall panel assembly 10; specifically, when gravure printing is required, the plate roller 25 is replaced with a gravure plate roller, the matching roller 35 is replaced with a gravure embossing rubber roller, and the scraper assembly 40 is installed at a designated position; when flexographic printing is required, the plate roller 25 is replaced with a flexographic plate roller, the matching roller 35 is replaced with a metal printing roller, and the flexographic printing unit assembly 50 is installed at a designated position, wherein the flexographic printing unit assembly 50 includes a flexographic printing unit scraper group and anilox roller group. The printing device of the present invention realizes the replacement of gravure printing and flexographic printing by providing interchangeable gravure plate rollers or flexographic plate rollers, correspondingly providing interchangeable gravure embossing rubber rollers or metal printing rollers and interchangeable scraper assemblies 40 or flexographic printing unit assemblies 50, thereby avoiding the purchase of printing machines of different formats, reducing costs, and reducing the floor space.

[0023] Please refer to Figure 3-5 The plate roller assembly 20 includes a first bracket 21, a plate roller shaft 22, a first limiting seat 23, a second limiting seat 24, and a limiting device 26. The plate roller shaft 22 is rotatably connected to the first bracket 21; the first limiting seat 23 is sleeved on the plate roller shaft 22; the second limiting seat 24 is sleeved on the plate roller shaft 22; the plate roller 25 is sleeved on the plate roller shaft 22 and is located between the first limiting seat 23 and the second limiting seat 24; the limiting device 26 is arranged on the second limiting seat 24 and is detachably connected to the first bracket 21; the limiting device 26 and the second limiting seat 24 are removed in sequence or simultaneously to replace the plate roller 25, and the plate roller 25 adopts a gravure plate roller or a flexographic plate roller. The structure of the present invention is used to limit the plate roller 25 by setting a first limiting seat 23 and a second limiting seat 24, and at the same time uses a limiting device 26 for limiting. When the plate roller 25 needs to be replaced, the second limiting seat 24 and the limiting device 26 can be removed to realize the replacement of the gravure plate roller and the flexographic plate roller.

[0024] Please refer to Figure 3The first bracket 21 includes a first bottom plate 211 and two first vertical plates 212 arranged side by side on the first bottom plate 211. A first driving device 27 is arranged on the first bracket 21 at a side away from the limiting device 26. The two first vertical plates 212 and the first bottom plate 211 are in a U-shape as a whole. The first driving device 27 is arranged on the outer side of one of the first vertical plates 212 and is used to drive the plate roller shaft 22 to rotate and drive the plate roller 25 to rotate. The limiting device 26 is arranged on the other first vertical plate 212 and is detachably connected to the first vertical plate 212.

[0025] Please refer to Figure 3-5 The first limiting seat 23 of the present invention is directly arranged on the plate roller shaft 22, and the two are relatively fixed (that is, when the plate roller shaft 22 rotates, the first limiting seat 23 rotates together). Specifically, the first limiting seat 23 can be connected to the plate roller shaft 22 by a keyway and a key tooth. The first limiting seat 23 is truncated in shape and can limit the plate roller 25 from moving along the central axis of the plate roller shaft 22. The plate roller 25 and the first limiting seat 23 are also relatively fixed and connected by a keyway and a key tooth. Specifically, the inner side of one end of the plate roller 25 connected to the first limiting seat 23 is provided with a shape that matches the first limiting seat 23, and the outer side wall of the first limiting seat 23 can be embedded with a key tooth, and the inner side of the plate roller 25 is provided with a keyway that matches the key tooth. A transition cone sleeve is also sleeved on the plate roller shaft 22. The transition cone sleeve 28 is arranged side by side with the first limit seat 23 and is relatively fixed to the plate roller shaft 22. Specifically, bolts can be threadedly connected to the transition cone sleeve 28. After the bolts are tightened, they directly rest against the outer wall of the plate roller shaft 22 to fix or limit the transition cone sleeve 28.

[0026] Please refer to Figure 4 A plate roller gear 251 is also provided on one end surface of the plate roller 25 , and a avoidance hole is provided inside the plate roller gear 251 , and the inner diameter of the avoidance hole is larger than the maximum outer diameter of the first limit seat 23 .

[0027] The limiting device 26 includes a first flange 261, a second flange 262, and a first bearing 263. The first flange 261 is embedded in the first bracket 21; the second flange 262 is arranged on the first flange 261; the first bearing 263 is sleeved on the second limiting seat 24 and is located in the second flange 262; the first bearing 263 is sleeved on the second limiting seat 24 and is limited on the second limiting seat 24 by a first C-shaped retaining ring, and guide covers 264 are also sleeved on both end surfaces of the first bearing 263, and are all located in the second flange 262, that is, one guide cover 264, the first bearing 263 and the other guide cover 264 are arranged side by side in the second flange 262, and then are limited in the second flange 262 by the second retaining ring, and the second flange 262 is fixed to the first flange 261 by a plurality of bolts, so that when the first flange 261 is taken out, the second flange 262 and the second limiting seat 24 will be driven to separate from the plate roller 22. An avoidance hole needs to be provided on the first vertical plate 212 near the second limiting seat 24 to facilitate operations such as adding ink to the ink cartridge or smoothing the ink cartridge. Therefore, an avoidance groove also needs to be provided on the first flange 261. The first vertical plate 212 is also provided with a mounting position for matching the first flange 261. In order to improve the stability of the support, two support columns 2121 are provided on the first vertical plate 212 with the avoidance hole to support the first flange 261, and then quickly locked and disassembled through N first fixing members 2122. The specific first fixing member 2122 is L-shaped when viewed from the side. The bolts are locked on the first bracket 21. When the limiting device 26 needs to be installed, the bolts are loosened and the first fixing member 2122 is rotated to avoid dryness when installing the limiting device 26. After the limiting device 26 is installed in place, the first fixing member 2122 is rotated to make it partially against the end surface of the first flange 261, and then the bolts are locked to achieve rapid locking and disassembly. The number of N is set according to needs. In this embodiment, two are set. The limiting device 26 can be quickly and stably limited on the first bracket 21 by matching the support column 2121 with the first fixing member 2122. In order to further improve the stability after installation, the second limiting seat 24 is sleeved on one end of the plate roller shaft 22, and then further fixed by bolts from the end of the second limiting seat 24. The bolts directly pass through the first flange 261, the second flange 262 and the second limiting seat 24, and are threadedly connected to the end of the plate roller shaft 22. Two first handles 2611 are also provided on the outer end surface of the first flange 261 to facilitate the removal of the limiting device 26.

[0028] Please refer to Figure 9-11The present invention also includes a pressing rubber roller mechanism located above the plate roller assembly 20, the pressing rubber roller mechanism includes a support plate 31, a second bracket 32, a second driving device 33, a rubber roller shaft 34, and a matching roller 35. The second bracket 32 ​​is arranged below the support plate 31 and can move in the vertical direction; the second driving device 33 is arranged on the support plate 31 and is used to drive the second bracket 32 ​​to move in the vertical direction, wherein the motor used by the second driving device 33 can be a high-precision motor to drive the matching roller 35 up and down in the vertical direction; the rubber roller shaft 34 is arranged on the second bracket 32 ​​and the two ends are detachably connected to the second bracket 32; the matching roller 35 is arranged on the rubber roller shaft 34 and is used to cooperate with the plate roller 25. Specifically, the plate roller 25 adopts a gravure plate roller or a flexographic plate roller, and the corresponding matching roller 35 adopts a gravure embossing rubber roller or a metal printing roller. The second driving device 33 drives the second bracket 32 ​​to approach the plate roller assembly 20 or move away from the plate roller assembly 20 in the vertical direction. The second driving device 33 can be in two groups, including a driving motor with an output end facing the second bracket 32, a screw rod arranged at the output end of the driving motor, and a screw rod sleeve arranged on the second bracket 32 ​​and matched with the screw rod. The driving motor drives the screw rod to rotate, thereby driving the screw rod sleeve to move along the direction of the screw rod center axis. Since the screw rod sleeve is fixed on the second bracket 32, it drives the second bracket 32 ​​to move. In order to ensure smooth and stable up and down movement, slide rails can be arranged on both sides of the second bracket 32, and a slider matching the slide rails is arranged on the lower wall panel assembly 10, and the slider is slidably connected to the slide rails.

[0029] The second bracket 32 ​​is provided with a groove 321 for placing the rubber roller shaft 34, and the opening of the groove 321 is provided with a fixing seat 36 for restricting the rubber roller shaft 34 to the groove 321. The groove 321 is U-shaped, and the opening faces the side of the second bracket 32. One end of the fixing seat 36 is rotatably connected to the second bracket 32, and the other end is detachably connected to the second bracket 32. Specifically, the fixing seat 36 and the detachable end of the second bracket 32 ​​are locked to the second bracket 32 ​​by bolts. By loosening the bolts and rotating the fixing seat 36, the rubber roller shaft 34 with the matching roller 35 can be removed from the second bracket 32. In order to prevent the rubber roller shaft 34 from rotating in the present invention, a threaded hole is further provided on the fixing seat 36, which is threadedly connected to the fixing seat 36 by bolts and abuts against the outer wall of the rubber roller shaft 34 to prevent the rubber roller shaft 34 from being rotatably connected to the second bracket 32. Two second bearings 37 are provided on the rubber roller shaft 34 and are located at both ends of the matching roller 35. The matching roller 35 is sleeved on the two second bearings 37 to facilitate the smooth rotation of the matching roller 35. Specifically, the two second bearings 37 are first embedded in the two ends of the matching roller 35 and then sleeved on the rubber roller shaft 34. The two ends of the matching roller 35 with the second bearings 37 are limited by limit rings 38. The limit rings 38 are directly sleeved on the rubber roller shaft 34 and are locked and limited by bolts.

[0030] In the existing gravure printing or flexographic printing, most of the plate rollers 25 (gravure plate rollers or flexographic plate rollers) are installed in the lower board wall assembly, which is not convenient for replacement. The present invention focuses on improving the structure of the plate roller 25 that is not easy to replace, so as to realize the disassembly, replacement and installation of the plate roller 25 from the side of the whole. The matching roller 35 (gravure embossing rubber roller or metal printing roller) used in conjunction with the plate roller 25 is in a higher position and is not convenient for replacement. Therefore, a groove 321 is provided to cooperate with the fixing seat 36 to realize the rapid replacement of the matching roller 35, and the ink cartridge can be moved out of position on the first bracket 21 to facilitate replacement from the side. Since the metal scraper for gravure printing and the anilox roller assembly for flexographic printing are in a lower position and have enough space for replacement, they only need to be modularized and conveniently replaced by a number of bolts and positioning columns.

[0031] In summary, the printing equipment of the present invention realizes the replacement of gravure printing and flexographic printing by providing interchangeable gravure plate rollers or flexographic plate rollers, correspondingly providing interchangeable gravure embossing rubber rollers or metal printing rollers and interchangeable scraper assemblies or flexographic printing unit assemblies, thereby avoiding the purchase of printing machines with different formats, reducing costs, and reducing the floor space.

[0032] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A printing device compatible with gravure printing and flexographic printing, characterized in that: include: Lower wall panel assembly; A printing plate roller assembly, which is arranged on the lower wall plate assembly and comprises a printing plate roller cylinder, and the printing plate roller cylinder is a gravure printing plate roller or a flexographic printing plate roller; A pressing rubber roller mechanism, which is arranged on the lower wallboard assembly and located above the plate roller assembly, and comprises a matching roller, wherein the matching roller is a gravure embossing rubber roller or a metal printing roller; as well as: a scraper assembly, the scraper assembly being arranged on the lower wall assembly and arranged side by side with the pressing roller mechanism; or A flexographic printing unit assembly, wherein the flexographic printing unit assembly is arranged on the lower wall assembly and arranged side by side with the plate roller assembly; The plate roller adopts a gravure plate roller, the corresponding matching roller adopts a gravure embossing rubber roller, and a scraper assembly is arranged on the lower wall panel assembly; the plate roller adopts a flexographic plate roller, the corresponding matching roller adopts a metal printing roller, and a flexographic printing unit assembly is arranged on the lower wall panel assembly.

2. The printing device compatible with gravure printing and flexographic printing according to claim 1, characterized in that: The plate roller assembly comprises: First bracket; A plate roller shaft, the plate roller shaft is rotatably connected to the first bracket; A first limiting seat, wherein the first limiting seat is sleeved on the plate roller shaft; A second limiting seat, wherein the second limiting seat is sleeved on the plate roller shaft; A limiting device, the limiting device is arranged on the second limiting seat and is detachably connected to the first bracket; The plate roller is sleeved on the plate roller shaft and is located between the first limiting seat and the second limiting seat; the limiting device and the second limiting seat are removed in sequence or simultaneously to replace the plate roller.

3. The printing device compatible with gravure printing and flexographic printing according to claim 2, characterized in that: The first bracket includes a first bottom plate and two first vertical plates which are arranged on the first bottom plate and arranged side by side.

4. The printing device compatible with gravure printing and flexographic printing according to claim 2, characterized in that: A first driving device is arranged on a side of the first bracket away from the limiting device.

5. The printing device compatible with gravure printing and flexographic printing according to claim 2, characterized in that: A plate roller gear is also arranged on one end surface of the plate roller, and a avoidance hole is arranged inside the plate roller gear, and the inner diameter of the avoidance hole is larger than the maximum outer diameter of the first limiting seat.

6. The printing device compatible with gravure printing and flexographic printing according to claim 2, characterized in that: The limiting device comprises: A first flange, embedded in the first bracket; A second flange, disposed on the first flange; The first bearing is sleeved on the second limiting seat and is located in the second flange.

7. The printing device compatible with gravure printing and flexographic printing according to claim 1, characterized in that: The laminating rubber roller mechanism comprises: Support plate; A second bracket, disposed below the support plate and movable in a vertical direction; A second driving device, disposed on the support plate and used to drive the second bracket to move along a vertical direction; A rubber roller shaft, which is disposed on the second bracket and has two ends detachably connected to the second bracket; The matching roller is arranged on the rubber roller shaft and is used in conjunction with the plate roller.

8. The printing device compatible with gravure printing and flexographic printing according to claim 7, characterized in that: The second bracket is provided with a groove for accommodating the rubber roller shaft, and the opening of the groove is provided with a fixing seat for confining the rubber roller shaft in the groove.

9. The printing device compatible with gravure printing and flexographic printing according to claim 8, characterized in that: One end of the fixing seat is rotatably connected to the second bracket, and the other end is detachably connected to the second bracket.

10. The printing device compatible with gravure printing and flexographic printing according to claim 8, characterized in that: The fixing seat is also provided with a threaded hole, which is threadedly connected with the fixing seat by a bolt and abuts against the outer side wall of the rubber roller shaft.

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