Coating Equipment

Abstract

To provide a coating device which can suppress occurrence of abnormal noise that is apt to occur along with rotation of a rotary drum.SOLUTION: A coating device includes: a rotary drum which stores granules to be treated therein, with a rear end side thereof transmitted with a rotation force of a rotary driving mechanism, and which is rotationally driven around an axis thereof; and roller mechanisms for rotatably supporting the rotary drum on a front end side of the rotary drum. The roller mechanism has a roller rolling while, from below, supporting a support part provided on the front end side of the rotary drum. The roller is composed of a plurality of roller compositions that each independently rotate.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a coating apparatus for coating, mixing, drying, etc., powdered or granular materials such as pharmaceuticals, foods, and agricultural chemicals, and in particular to a coating apparatus equipped with a rotary drum that is driven to rotate about its axis. [Background technology]

[0002] Coating equipment equipped with a ventilated rotating drum that rotates around its axis is used to apply film coating, sugar coating, etc. to pharmaceutical, food, pesticide, etc. tablets, soft capsules, pellets, granules, and other similar materials (hereinafter collectively referred to as powder and granular materials).

[0003] An example of a coating apparatus equipped with a rotating drum (coating pan) is disclosed in Patent Document 1. As shown in Figures 7 and 8, the coating apparatus described in Patent Document 1 includes a rotating drum 102 that contains powder or granular material to be treated and is driven to rotate about its axis by the rotational force of a rotation drive mechanism 101 transmitted to its rear end, and a roller mechanism 103 that rotatably supports the rotating drum 102 at its front end.

[0004] That is, it is rotated by a rotary drive mechanism 101 (for example, a motor, a reducer, a chain, a sprocket, etc.), but since the rotary drum 102 is heavy, a roller mechanism 103 is provided to support the front side of the rotary drum 102.

[0005] In this case, rollers 107 of roller mechanism 103 roll on a ring-shaped outer flange (mouth fitting) 106 provided along the opening edge of the front end opening 102a of the rotating drum 102, and two roller mechanisms 103 are provided on the front side of the device and support the mouth fittings 106 from below.

[0006] The roller (front support roller) 107 of the roller mechanism 103 is rotatably supported on a roller support shaft 110 that is supported by a bracket 109 provided on a housing 108. The roller 107 of the roller mechanism 103 is a resin roller whose outer diameter surface is cylindrical. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Patent Publication No. 2021-96106 Summary of the Invention [Problem to be solved by the invention]

[0008] In the coating device described above, the roller 107 rotates in synchronization with the rotation of the rotating drum 102. However, in this case, the roller 107 may become misaligned, and such misalignment may cause the roller 107 to become less synchronized with the rotation of the rotating drum 102, resulting in slippage and noise, or damage to the receiving roller.

[0009] In view of the above circumstances, the present invention has as its technical object to provide a coating device that can suppress the generation of abnormal noise that is likely to occur as the rotating drum rotates. [Means for solving the problem]

[0010] The coating apparatus of the present invention, which was invented to solve the above problems, comprises a rotating drum that contains powder or granular material to be processed and is driven to rotate about its axis by the rotational force of a rotation drive mechanism transmitted to its rear end, and a roller mechanism that rotatably supports the rotating drum at its front end, wherein the roller mechanism has rollers that rotate about a rotation axis parallel to the rotation axis of the rotating drum while being supported from below by a support portion consisting of the cylindrical surface of the rotating drum, and the rollers are composed of a plurality of roller assemblies that rotate independently. Note that the term "parallel" as used herein includes both parallel and approximately parallel states, and approximately parallel means a range from the parallel state (perfectly parallel) that a person skilled in the art would recognize as a setting or manufacturing error.

[0011] According to the coating device of the present invention, the roller is made up of a plurality of roller assemblies that rotate independently, so that the rollers are less likely to slip.

[0012] The outer diameter surface of each roller component may be cylindrical. By configuring in this way, each roller component has a simple shape, which improves productivity.

[0013] The roller may be configured with one central roller component disposed in the axial center and a pair of end roller components disposed on either side of the central roller component in the axial direction, sandwiching the central roller component. This configuration gives the roller a stable shape, and the stress on the roller is concentrated near the roller core, making it more difficult for the roller to slip.

[0014] The rotating drum may comprise a drum body having a front-end opening that opens horizontally, and a ring-shaped outer flange provided along the edge of the front-end opening of the drum body, the ring-shaped outer flange having a tapered wall that increases in diameter from the inside of the drum to the outside of the drum, and a cylindrical surface of a secondary member attached to the ring-shaped outer flange forming a support portion against which the outer diameter surfaces of the roller components of the roller mechanism roll. With this configuration, the front side of the rotating drum can be stably supported by the roller mechanism, and since the inner peripheral surface of the ring-shaped outer flange has a tapered surface that increases in diameter from the inside of the drum to the outside of the drum, the powder and granular material inside the rotating drum can be easily discharged.

[0015] The rotating drum may also include a drum body having a horizontally extending front-end opening and a ring-shaped outer flange provided along the edge of the front-end opening of the drum body, with the outer diameter surface of the ring-shaped outer flange forming a support portion against which the outer diameter surfaces of the roller components of the roller mechanism roll. This configuration allows the roller mechanism to stably support the front side of the rotating drum. Furthermore, since a secondary material having a cylindrical surface is not required, the number of parts can be reduced, improving the assembly of the coating device and reducing costs.

[0016] It is preferable that a pair of the roller mechanisms are disposed at a predetermined interval below the roller support portion, so that the rotating drum can be stably supported.

[0017] Each roller component of the roller mechanism may be made of resin or rubber and fitted onto a metal ring body on the inner diameter side. This configuration stabilizes the contact of the roller with the rotating drum, enabling stable synchronous rotation with the rotating drum. Moreover, the metal ring body on the inner diameter side effectively ensures the rigidity of the roller. [Effects of the Invention]

[0018] According to the present invention, roller slippage is less likely to occur, and the rollers of the roller mechanism rotate stably and synchronously with the rotation of the rotating drum, effectively preventing the generation of abnormal noise and preventing damage to the rollers, the support parts of the rotating drum, etc. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a longitudinal sectional view of a coating apparatus according to an embodiment of the present invention. [Figure 2] 1A and 1B show a rotary drum, in which FIG. 1A is a cross-sectional view and FIG. 1B is a longitudinal-sectional view. [Figure 3] FIG. [Figure 4] FIG. [Figure 5] FIG. [Figure 6] 3A and 3B show a roller mechanism, in which FIG. 3A is an enlarged cross-sectional view, and FIG. 3B is a simplified view showing the relationship between the roller support shaft and the receiving member. [Figure 7] 1 is a simplified side view of a conventional coating apparatus. [Figure 8] FIG. 1 is a simplified front view of a conventional coating apparatus. DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0021] As shown in FIG. 1, the coating apparatus according to this embodiment includes a ventilated rotating drum 1 that is driven to rotate about an axis X that is parallel or substantially parallel to the horizontal. The rotating drum 1 is rotatably housed within a casing 2 and is driven to rotate by a rotation drive mechanism 3 disposed at its rear end. The rotating drum 1 is housed within an inner housing 4 within the casing 2, the space of which is airtightly sealed from the outside. A spray nozzle unit 5 having one or more spray nozzles 5a that spray a coating liquid or other spray liquid toward a powder or granular material layer is also disposed within the rotating drum 1. In this embodiment, the rotating drum 1 has a front opening 1e at its front end and a rear opening 1g at its rear end. Air intakes A1 and A2 are provided on the sides of the front opening 1e and the rear opening 1g, respectively.

[0022] The front end of the casing 2 forms a chamber 2a, and the front of the chamber 2a is closed by a front panel 2b having an inspection window 2b1. In addition, a discharge port 2c for powder or granular material (processed powder or granular product: for example, tablets) is provided at the bottom of the chamber 2a.

[0023] The spray nozzle unit 5 is attached to the tip of an L-shaped support pipe 6 via a connecting pipe 7, and the base end of the support pipe 6 is connected to a vertical movement mechanism 8 attached to the inner surface of the front panel 2b. The vertical movement mechanism 8 allows the vertical position of the spray nozzle unit 5 to be adjusted manually or automatically (by an actuator mechanism such as an air cylinder or ball screw).

[0024] As shown in FIG. 2, in this embodiment, the rotating drum 1 includes a peripheral wall 1a having a polygonal cross-sectional shape (e.g., a decagon or dodecagon; in this embodiment, a dodecagon), an end wall 1b continuing from the front end of the peripheral wall 1a, and an end wall 1c continuing from the rear end of the peripheral wall 1a. Each side surface of the peripheral wall 1a is provided with a ventilation section formed by a perforated portion. In this embodiment, the ventilation section is formed by attaching a perforated plate to each side surface of the peripheral wall 1a. The front end of the end wall 1b continues with the rear end of an annular mouth ring 1d, and a front end opening 1e is provided at the front end of the mouth ring 1d.

[0025] That is, the rotating drum 1 comprises a drum body 1A having a front end opening 1e and a rear end opening 1g that open horizontally, and the mouth ring portion 1d, which is a ring-shaped outer flange portion provided along the opening edge of the front end opening 1e of the drum body 1A.

[0026] The inner diameter surface 1d1 of the mouth ring portion (ring-shaped outer flange portion) 1d is formed in a shape that gradually widens in diameter toward the front, for example, a conical surface that gradually widens in diameter toward the front at a cone angle α (the angle formed with the axis of the rotating drum 1). The inclination angle α of the inner diameter surface 1d1 is preferably, for example, 5° or greater. A connecting portion 1f is provided at the rear end of the end wall portion 1c, and a rear-end opening 1g is provided in the connecting portion 1f. An extension portion 1h (see FIG. 1) that serves as a mount for drive system components that rotate the rotating drum 1 is connected to the connecting portion 1f. The inner diameter surface 1d1 of the mouth ring portion 1d need only be formed in a shape that gradually widens in diameter toward the front; it does not necessarily have to be formed in a conical surface. For example, the inner diameter surface 1d1 of the mouth ring portion 1d may be formed in a shape that gradually widens in diameter toward the front, like a curved surface.

[0027] In this embodiment, annular seal rings 13 are provided at both axial ends of the peripheral wall 1a of the rotating drum 1, and multiple partitions 14 are provided at predetermined intervals in the rotational direction on the outer periphery of the peripheral wall 1a. The partitions 14 are generally plate-shaped, have a longitudinal dimension that is approximately the same as the axial dimension of the peripheral wall 1a, and are arranged on the outer periphery of the peripheral wall 1a in a direction parallel to the axis of the rotating drum 1. Furthermore, the partitions 14 are respectively arranged on each of the apexes 1a2 and each of the side faces 1a1 of the polygonal peripheral wall 1a.

[0028] In this case, the rotational force of the rotary drive mechanism 3 is transmitted to the rear end of the rotary drum 1, causing it to rotate about its axis X. The rotary drum is rotatably supported at its front end by a pair of roller mechanisms 15, 15 provided on the chamber 2a side of the front end of the casing 2.

[0029] As shown in Figures 3 to 5, each roller mechanism 15 is provided in the casing 2, placed on a support frame 16, and comprises a pair of support plates 18, 18 erected on a base plate 17 fixed to the support frame 16, a support shaft 19 supported by these support plates 18, 18, and a rotating body 21 rotatably fitted around this support shaft 19 via a bearing 20 (see Figure 6).

[0030] 6(a), the rotating body 21 comprises an inner diameter portion (metal ring body) 22 made of metal on the inner diameter side, an outer diameter portion (roller) 24 made of resin or rubber on the outer diameter side, and a pair of clamping plates 26 that clamp and hold the roller 24 and the metal ring body 22. In this case, the metal ring body 22 is formed of a short cylinder and has an inner flange 22a provided at the axial center of its inner diameter surface.With the metal ring body 22 clamped between the pair of clamping plates 26, 26, the outer ring of the bearing 20 fitted onto the support shaft 19 is clamped between the inner diameter side ring-shaped bulge 26a of the clamping plates 26 and the inner flange 22a of the metal ring body 22.

[0031] The support shaft 19 is composed of a support shaft main body 19a and outer fitting bodies 19b, 19b fitted onto the axial end sides of the support shaft main body 19a. A spacer 27 is fitted onto the axial center of the support shaft main body 19a, and the inner ring of the bearing 20 is sandwiched between the spacer 27 and the outer fitting bodies 19b, 19b.

[0032] In this case, the pair of clamping plates 26 and the metal ring body 22 of the rotating body 21 are integrated by bolt connections 30. That is, one of the clamping plates 26 is formed with a hole portion 31 consisting of an outer large-diameter hole 31a and an inner small-diameter hole 31b, a bolt insertion hole 32 is formed in the metal ring body 22 of the rotating body 21, and a screw hole 33 is provided in the other clamping plate 26. Then, a bolt member 34 is inserted from the side of one of the clamping plates 26, and the threaded portion of the bolt member 34 is screwed into the screw hole 33 of the other clamping plate 26. As a result, the rotating body 21 and the pair of clamping plates 26 are integrated and become rotatable around the support shaft 19. In this case, the head portion 34a of the bolt member 34 is fitted into the outer large-diameter hole 31a of the hole portion 31 of one of the clamping plates 26.

[0033] 6(a) and 6(b), notched recesses 18a are formed at the upper ends of the support plates 18, 18 serving as receiving members, and the end of the support shaft 19 is fitted into the notched recesses 18a, 18a. In this case, flat surface portions 41, 41 facing each other are formed at the end of the support shaft 19, and the flat surface portions 41, 41 engage with the side surfaces of the notched recesses 18a. This prevents the support shaft 19 from rotating.

[0034] In this embodiment, the roller 24 is made up of three roller components 25 (25A) at the center in the axial direction and roller components 25 (25B, 25B) at both ends in the axial direction, and each of the roller components 25A, 25B, 25B is made up of a ring body with a rectangular cross section and the same dimensions. The roller components 25A, 25B, 25B are not integrated, and can each rotate independently with respect to the metal ring body 22. The outer diameter surface of each roller component 25 is a cylindrical surface (straight surface).

[0035] As described above, each roller structure 25 is made of resin or rubber. Examples of resin materials that can be used include MC nylon (a registered trademark of Quadrant Polypenco Japan Co., Ltd.), nylon 6, POM (polyacetal), and PTFE (polytetrafluoroethylene). Examples of rubber that can be used include NR (natural rubber), CR (chloroprene), NBR (nitrile rubber), IIR (butyl rubber), EPDM (ethylene-propylene rubber), Q (silicone rubber), FKM (fluororubber), and U (urethane). The metal ring body 22 can be made of various metals, such as carbon steel, various stainless steels, various aluminum alloys, titanium, and various nickel-based high alloys.

[0036] Compared to nylon resin, MC nylon is a material with superior mechanical strength and durability, self-lubricating properties, and excellent sliding properties, and it also has excellent wear resistance, especially under heavy loads. It also has heat resistance, able to withstand temperatures of 120°C during continuous use. It also has chemical resistance, making it resistant to organic solvents, oils, and alkaline chemicals. This makes MC nylon ideal for rollers used in this type of coating equipment.

[0037] Furthermore, since the inner diameter surface 1d1 of the mouth ring portion 1d is formed in a shape that gradually widens toward the front, the outer diameter surface 1d2 of the mouth ring portion 1d also has a shape that gradually widens toward the front. In other words, the mouth ring portion (ring-shaped outer flange portion) 1d has a tapered wall. For this reason, the rollers 24 of the roller mechanism 15 cannot roll on the outer diameter surface 1d2 of the mouth ring portion 1d.

[0038] Therefore, in this coating apparatus, a secondary member 45 is attached to the mouth ring portion 1d as shown in FIG. 5. The secondary member 45 has a first portion 45a in the shape of a vertical flat ring that is connected to the mouth ring portion 1d by welding or other fastening means, and a second portion 45b in the shape of a short cylinder attached to the end wall portion 1b that is also connected by welding or other fastening means. The outer diameter end of the first portion 45a and the axial outer end of the second portion 45b are integrally connected by welding or other fastening means. Therefore, the cylindrical surface of the second portion 45b of the secondary member serves as the support portion 42 on which the outer diameter surfaces of the roller components 25 of the roller mechanism 15 roll. In this case, the support portion 42 is formed by a recessed surface 45b1 provided on the outer diameter surface of the second portion 45b.

[0039] 4, a pair of roller mechanisms 15 are disposed at a predetermined distance below the support portion 42. With respect to a vertical axis Oa perpendicular to the rotation axis O of the rotating drum 1, one roller mechanism 15A is tilted clockwise, for example, by 35 degrees, as viewed from the front, and the other roller mechanism 15B is tilted counterclockwise, for example, by 35 degrees, as viewed from the front. In this case, when the tilt angle of one roller mechanism 15A is θ1 and the tilt angle of the other roller mechanism 15B is θ2, θ1 = θ2. Note that θ1 + θ2 can be varied in various ways as long as it is not too small, causing the rollers 24 of each roller mechanism 15A and 15B to come into contact with each other, or too large, causing the rollers 24 of each roller mechanism 15A and 15B to be unable to support the support portion 42 of the rotating drum from below.

[0040] The axial length of support portion 42 is set to be longer than the axial length of roller 24. When the axial length of roller 24 is L1 (see FIG. 5) and the axial length of support portion 42 is L2 (see FIG. 5), L2 is approximately 1.5×L1 to 2.5×L1. Furthermore, when the diameter of roller 24 (diameter of the axial center portion) is D1 (see FIG. 4) and the diameter of support portion 42 is D2 (see FIG. 4), D2 is approximately 4.5×D1 to 6.5×D1. Note that these dimensional relationships are not limited to those in the present invention, but setting them in this manner has the advantage of more stably supporting support portion 42 of rotating drum 1 by roller mechanisms 15, 15.

[0041] The radial thickness of the roller 24 (the radial thickness of the roller assembly 25) and the radial thickness of the metal ring body 22 can be set arbitrarily, and the radial thickness of the roller assembly 25 and the radial thickness of the metal ring body 22 can be the same or different. For example, if the outer diameter of the roller 24 is D1 (see FIG. 4) and the radial thickness of the roller assembly 25 is B (see FIG. 6), then B can be approximately 0.10×D1 to 0.12×D1. If the radial thickness of the metal ring body 22 is C (see FIG. 6), then C can be approximately 0.10×D1 to 0.12×D1. These dimensional relationships are not limited to these approximate dimensions in the present invention, but can be set variously depending on the materials of the outer diameter portion 23 and the inner diameter portion 22. That is, the size and material of each member can be selected so that the roller mechanism can exhibit optimal strength and rigidity to support the support portion 42 of the rotating drum 1.

[0042] In the coating device configured as described above, when the rotary drive mechanism 3 is driven to rotate the rotary drum 1, the roller 24 rotates (rolls) around the rotation axis O1 that is parallel to the rotation axis O of the rotary drum 1 while being supported from below by the support part 42 of the rotary drum 1. Note that the term "parallel" as used above includes both a parallel state and an approximately parallel state, and the term "approximately parallel" refers to a range from the parallel state (perfectly parallel) that a person skilled in the art would recognize as a setting or manufacturing error.

[0043] In the coating device according to the present invention, the rollers 24 are made up of a plurality of roller assemblies 25 that rotate independently, making it difficult for the rollers 24 to slip. As a result, the rollers 24 of the roller mechanism 15 rotate stably and synchronously with the rotation of the rotating drum 1, effectively preventing the generation of abnormal noise and preventing damage to the rollers 24 and the support portion 42 of the rotating drum 1. The outer diameter surface of each roller assembly 25 may be cylindrical. This configuration allows each roller assembly 25 to have a simple shape, resulting in excellent productivity.

[0044] The roller may be configured with one central roller component 25 disposed in the axial center, and a pair of end roller components 25 disposed on both axial sides of the central roller component 25 so as to sandwich the central roller component 25. By configuring it in this way, the roller 24 has a stable shape, stress on the roller 24 is concentrated more near the roller core, and slippage of the roller 24 can be stably prevented.

[0045] In this embodiment, the rotating drum 1 includes a drum main body 1A having a front-end opening that opens horizontally, and a ring-shaped outer flange 1d provided along the edge of the front-end opening 1e of the drum main body 1A, the ring-shaped outer flange 1d being a tapered wall that increases in diameter from the inside of the drum toward the outside, and the cylindrical surface of a secondary member 45 attached to the ring-shaped outer flange forming a support portion 42 on which the outer diameter surfaces 24a of the rollers 24 of the roller mechanism 15 roll. With this configuration, the front side of the rotating drum 1 can be stably supported by the roller mechanism 15, and since the ring-shaped outer flange 1d is a tapered wall that increases in diameter from the inside of the drum toward the outside, and the inner diameter surface 1d1 of the ring-shaped outer flange 1d is a tapered surface that increases in diameter from the inside of the drum toward the outside, the rotating drum 1 has excellent dischargeability for powder and granular material.

[0046] However, if the ring-shaped outer flange 1d is not tapered and the outer diameter surface 1d2 of the ring-shaped outer flange 1d is cylindrical, the outer diameter surface of the ring-shaped outer flange 1d can form the support portion 42 on which the outer diameter surface 24a of the roller 24 of the roller mechanism 15 rolls, without the need for the secondary member 45. This configuration reduces the number of parts, improves the assembly of the coating device, and reduces costs. Even when the secondary member 45 is not provided, the axial length of the support portion 42 formed by the cylindrical surface of the outer diameter surface 1d2 of the ring-shaped outer flange 1d is set longer than the axial length of the roller 24. For example, when the axial length of the roller 24 is L1 and the axial length of the support portion 42 is L2, L2 can be approximately 1.5 × L1 to 2.5 × L1. Furthermore, When the diameter of the roller 24 (diameter of the axial center) is D1 and the diameter of the support portion 42 is D2, for example, D2 can be approximately 4.5×D1 to 6.5×D1. Of course, the present invention is not limited to this.

[0047] It is preferable that a pair of roller mechanisms 15 are disposed at a predetermined interval below the support portion 42. With this configuration, the rotating drum 1 can be supported stably.

[0048] Each roller component 25 of the rollers 24 of the roller mechanism 15 may be made of resin or rubber and fitted onto the inner diameter side of the metal ring body 22. This configuration stabilizes the contact of the rollers 24 with the rotating drum 1, enabling stable synchronous rotation with the rotating drum 1. Moreover, since the inner diameter side is made of the metal ring body 22, the rigidity of the rollers 24 can be effectively ensured.

[0049] Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments. Various modifications are possible. For example, in the embodiment, the roller 24 has three roller assemblies 25. However, the number is not limited to three, and may be four or more, or may be two. Furthermore, in the embodiment, the roller assemblies 25 have the same thickness (axial dimension). However, the thickness (axial dimension) of each roller assemblies may be different. For example, the roller assemblies 25A at the axial center may be longer than the roller assemblies 25B at the axial ends. Furthermore, the roller assemblies 25 may be made of the same or different materials. In this case, all of the assemblies may be made of different materials, or the roller assemblies 25B at the axial ends may be made of the same material, and the roller assemblies 25A at the axial center may be made of a different material.

[0050] The present invention is not limited to coating apparatuses equipped with rotating drums whose peripheral wall has a polygonal cross-sectional shape, but is also applicable to coating apparatuses equipped with rotating drums whose peripheral wall has a circular, conical, or polygonal conical cross-sectional shape. Furthermore, the present invention is not limited to coating apparatuses with a so-called jacketless structure, but is also applicable to coating apparatuses with a structure in which a jacket is attached to the peripheral wall of the rotating drum. Furthermore, the present invention is not limited to coating apparatuses in which the rotating drum is driven to rotate around an axis parallel or approximately parallel to the horizontal line, but is also applicable to coating apparatuses in which the rotating drum is driven to rotate around an axis inclined with respect to the horizontal line. [Explanation of symbols]

[0051] 1 rotating drum 1A Drum body 1d Ring-shaped outer flange (mouth ring) 15, 15A, 15B roller mechanism 24 Laura 25, 25A, 25B Roller assembly 42 Support part 45 Sub-material

Claims

1. A coating device comprising: a rotary drum in which powder or granular material to be treated is accommodated, the rotary drum being rotated about its axis by a rotational force transmitted from a rotary drive mechanism to a rear end thereof; and a pair of roller mechanisms rotatably supporting the rotary drum at a front end thereof, a coating device characterized in that each of the roller mechanisms has a single roller that rotates around a rotation axis parallel to the rotation axis of the rotating drum while being supported from below on a support portion consisting of the cylindrical surface of the rotating drum, and each roller of one roller mechanism is composed of a plurality of roller structures that rotate independently as the rotating drum rotates.

2. 2. The coating apparatus according to claim 1, wherein the outer diameter surface of each roller member is cylindrical.

3. 3. The coating device according to claim 1, wherein the roller is composed of one central roller assembly disposed in the axial center and a pair of end roller assemblies disposed on both axial sides of the central roller assembly so as to sandwich the central roller assembly.

4. The coating device according to any one of claims 1 to 3, characterized in that the rotating drum comprises a drum main body having a front end opening that opens in the horizontal direction, and a ring-shaped outer flange provided along the opening edge of the front end opening of the drum main body, the ring-shaped outer flange having a tapered wall that expands in diameter from the inside of the drum toward the outside of the drum, and a cylindrical surface of a secondary material attached to the ring-shaped outer flange forming a support portion on which the outer diameter surfaces of each roller component of the roller mechanism roll.

5. 4. The coating device according to claim 1, wherein the rotating drum comprises a drum main body having a front end opening that opens in the horizontal direction, and a ring-shaped outer flange provided along the edge of the front end opening of the drum main body, and the outer diameter surface of the ring-shaped outer flange forms a support portion on which the outer diameter surfaces of each roller component of the roller mechanism roll.

6. The coating device according to any one of claims 1 to 5, characterized in that each roller component of the rollers of the roller mechanism is made of resin or rubber and is fitted onto an inner diameter side metal ring body.

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