Device and method for detecting condition of unvulcanized rubber sheet

Abstract

To provide a device and a method for detecting the condition of an unvulcanized rubber sheet, which can accurately grasp the condition of the unvulcanized rubber sheet when the sheet is unwound from a winding drum together with a liner and / or when the sheet is wound onto a winding drum together with a liner.SOLUTION: There is provided a device and method for detecting the condition of an unvulcanized rubber sheet, comprising: a sensor unit 2; a holding unit 3; a guide unit 4; and a maintenance mechanism 5. The device and method are configured such that the holding unit holding the sensor unit is made slidable in a drum radial direction by the guide unit, the maintenance mechanism that abuts against a surface of a liner L at an outermost periphery of a winding drum 8 maintains a constant distance in the drum radial direction between a surface of the liner L at the outermost periphery of the winding drum 8 and the sensor unit 2, and the sensor unit 2 detects designated detection items of a sheet S at the outermost periphery of the winding drum 8 while a distance between the sensor unit 2 and the sheet S at the outermost periphery of the winding drum 8 in the drum radial direction is maintained substantially constant.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a device and method for detecting the condition of an unvulcanized rubber sheet, and more specifically to a device and method for detecting the condition of an unvulcanized rubber sheet that can accurately grasp the condition of the unvulcanized rubber sheet when it is unwound from a winding drum together with a liner and / or when it is wound onto a winding drum together with the liner. [Background technology]

[0002] At manufacturing sites of rubber products such as tires, for example, a long unvulcanized rubber sheet extruded by an extruder or the like is sometimes wound onto a winding drum with a liner interposed therebetween and temporarily stored. The wound long unvulcanized rubber sheet is then unwound from the winding drum when needed. The unvulcanized rubber sheet is then cut to a specified length and supplied to a forming drum or the like.

[0003] Because unvulcanized rubber sheets shrink over time, various methods and devices have been proposed for measuring the condition of unvulcanized rubber sheets that have been cut to a fixed length and wound around a forming drum (see, for example, Patent Document 1). On the other hand, the condition of the unvulcanized rubber sheet is not fully understood on the winding drum. Furthermore, when the unvulcanized rubber sheet is unwound from or wound onto the winding drum, the winding diameter of the unvulcanized rubber sheet on the winding drum changes, so some ingenuity is required to accurately grasp the condition of the unvulcanized rubber sheet on the winding drum. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2017-42971 Summary of the Invention [Problem to be solved by the invention]

[0005] The object of the present invention is to provide an unvulcanized rubber sheet condition detection device and method that can accurately grasp the condition of an unvulcanized rubber sheet when it is unwound from a winding drum together with a liner and / or when it is wound onto a winding drum together with a liner. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the unvulcanized rubber sheet condition detection device of the present invention is an unvulcanized rubber sheet condition detection device that grasps the condition of the unvulcanized rubber sheet when the unvulcanized rubber sheet is unwound from a winding drum together with a liner and / or when it is wound onto a winding drum together with the liner, and is characterized in that it has a sensor unit arranged above the winding drum, a holding unit that holds the sensor unit, a guide unit that slides the holding unit in the drum radial direction, and a maintenance mechanism that abuts against the surface of the liner at the outermost periphery of the winding drum and always maintains a constant radial distance between the surface and the sensor unit, and is characterized in that specified detection items of the unvulcanized rubber sheet at the outermost periphery of the winding drum are detected by the sensor unit.

[0007] The method for detecting the condition of an unvulcanized rubber sheet of the present invention is a method for detecting the condition of an unvulcanized rubber sheet, which grasps the condition of the unvulcanized rubber sheet when it is unwound from a winding drum together with a liner and / or when it is wound onto a winding drum together with the liner, and is characterized in that a sensor unit is held by a holding unit and positioned above the winding drum, the holding unit is made slidable in the drum radial direction by a guide unit, and a maintenance mechanism abutting against the surface of the liner at the outermost periphery of the winding drum always maintains the radial distance between the surface and the sensor unit constant, and the sensor unit detects specified detection items of the unvulcanized rubber sheet at the outermost periphery of the winding drum. [Effects of the Invention]

[0008] According to the present invention, the maintaining mechanism, which abuts against the surface of the liner at the outermost periphery of the winding drum, always maintains a constant distance in the drum radial direction between the surface and the sensor unit. Therefore, even if the winding diameter of the unvulcanized rubber sheet on the winding drum changes when the unvulcanized rubber sheet together with the liner is unwound from or wound onto the winding drum, the distance in the drum radial direction between the unvulcanized rubber sheet at the outermost periphery of the winding drum and the sensor unit is maintained substantially constant. As a result, the state of the unvulcanized rubber sheet when being unwound from or wound onto the winding drum can be accurately determined from the detection data by the sensor unit. [Brief explanation of the drawings]

[0009] [Figure 1] 10 is an explanatory diagram illustrating an embodiment of a detection device when an unvulcanized rubber sheet is being unwound from a winding drum, as viewed from the side; FIG. [Figure 2] 2 is an explanatory diagram illustrating the detection device of FIG. 1 in a plan view. FIG. [Figure 3] FIG. 2 is an explanatory diagram illustrating an enlarged example of the detection device of FIG. 1. [Figure 4] 4 is an explanatory diagram illustrating a detection device as viewed from an arrow A in FIG. 3. [Figure 5] 4 is an explanatory diagram illustrating a state in which the winding diameter of the winding drum in FIG. 3 is reduced. FIG. [Figure 6] FIG. 3 is an explanatory diagram illustrating detection data by a sensor unit. [Figure 7] 10 is an explanatory diagram illustrating an embodiment of a detection device when an unvulcanized rubber sheet is being wound onto a winding drum, as viewed from the side; FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The unvulcanized rubber sheet condition detection device and method of the present invention will be described below based on the embodiments shown in the drawings.

[0011] In the embodiment of the unvulcanized rubber sheet condition detection device 1 (hereinafter referred to as the detection device 1) illustrated in FIGS. 1 to 4, a sensor unit 2 detects the condition of an unvulcanized rubber sheet S (hereinafter referred to as the sheet S) being unwound from a winding drum 8. A desired, specified detection item P is detected as the condition of the sheet S. A long sheet S is wound around the winding drum 8 with a liner L interposed therebetween. The winding drum 8 and a liner drum 9 are arranged vertically in front and behind on a drum frame 11, such as a dolly. The drum frame 11 is also provided with a known peeling unit 11b that peels the sheet S from the liner L. The peeling unit 11b may be, for example, a roller supported on a shaft extending in the drum width direction. In the drawings, arrows Fw and Bw indicate the front and rear, respectively, and arrows W and R indicate the drum width and drum radial directions of the winding drum 8 and the liner drum 9, respectively. The dashed-dotted line CL in the drawings indicates the center of the winding drum 8 (liner drum 9) in the drum width direction.

[0012] The detection device 1 has a sensor unit 2, a holding unit 3 that holds the sensor unit 2, a guide unit 4, a maintenance mechanism 5, and a calculation unit 7. The detection device 1 further has an outer diameter detection unit 6. The outer diameter detection unit 6 can be provided optionally.

[0013] Examples of the sheet S include various known types of tire tread rubber and side rubber made entirely of unvulcanized rubber, and carcass material made of unvulcanized rubber and reinforcing cords. Because the sheet S contains unvulcanized rubber, it is prone to adhesion and deformation. Therefore, when the sheet S is wound up, a liner L is inserted between the sheets S to prevent them from adhering to each other. The liner L is made of various known hard resins or metals such as aluminum. To prevent the wound up sheet S from being crushed, convex spacers Ls are provided at both widthwise ends of the liner L.

[0014] The sheet S unwound from the winding drum 8 is peeled off from the liner L and transported to a forming drum or the like located in front. The liner L peeled off from the sheet S is taken up onto the liner drum 9. Not only may one long sheet S (tread rubber or the like) be placed (wound) on the liner L, but two long sheets S (side rubber or the like) arranged side by side in the width direction of the drum may also be placed on the liner L.

[0015] The long sheet S unwound from the winding drum 8 is cut to a fixed length while being fed to the forming drum. The sheet S cut to a fixed length is wound around the forming drum and used as a tire component.

[0016] The winding drum 8 is supported by a drum frame 11 so as to be rotatable about a drum shaft 8a. The liner drum 9 is supported by the drum frame 11 so as to be rotatable about a drum shaft 9a. The winding drum 8 and the liner drum 9 are rotated in opposite directions by a drive motor 10. Specifically, the winding drum 8 and the liner drum 9 are driven to rotate outward relative to each other.

[0017] The sensor unit 2 is disposed above the winding drum 8. The sensor unit 2 detects the state of the sheet S (detection item P) in a non-contact manner. As the sensor unit 2, various known laser sensors, camera devices, etc. suitable for the detection item P are used. In this embodiment, one sensor unit 2 is disposed diagonally above the center of the width direction of the winding drum 8. Multiple sensor units 2 may be disposed depending on the detectable range of the sensor unit 2, the position of the detection target, the number of types of detection items P, etc.

[0018] The types of detection items P include at least one of five items: width, thickness, presence or absence of defects, surface temperature, and widthwise position of the sheet S relative to the winding drum 8. Any one of these detection items P may be detected, or a combination of any two, three, or four items, or all five items may be specified. In addition, the presence or absence of defects on the surface of the liner L at the outermost periphery of the winding drum 8 may be added to the detection items P. The presence or absence of defects in the sheet S or liner L in the detection item P refers to the presence or absence of unnecessary cuts or tears in the sheet S or liner L.

[0019] By setting the widthwise position of the sheet S relative to the winding drum 8 as detection item P, it is possible to grasp the degree of meandering of the sheet S relative to the winding drum 8. More specifically, the drum widthwise position of this sensor unit 2 is invariant with respect to the drum frame 11. The drum widthwise positions of the winding drum 8 and the liner L are also basically invariant with respect to the drum frame 11. Therefore, the positions of both widthwise ends of the sheet S are detected by the sensor unit 2, and the widthwise center position of the detected widthwise end positions is taken as the widthwise position of the sheet S. Then, the widthwise position of the sheet S relative to the known widthwise center position of the winding drum 8 is taken as the widthwise position of the sheet S relative to the winding drum 8, which is detection item P. In this way, it is possible to grasp the degree of meandering of the sheet S relative to the winding drum 8 based on the detection data by the sensor unit 2.

[0020] When the detection item P relates to dimensions and positions of the sheet S, such as the width, thickness, and widthwise position relative to the winding drum 8, a laser sensor or the like is used as the sensor unit 2. When the detection item P is the surface temperature of the sheet S, a temperature sensor is used as the sensor unit 2. When the detection item P is the presence or absence of defects in the sheet S or liner L, a camera device or the like is used as the sensor unit 2.

[0021] The holding portion 3 holds the sensor portion 2. In this embodiment, a beam-shaped member extending in the width direction of the drum is used as the holding portion 3, and the sensor portion 2 is detachably held therein.

[0022] The guide unit 4 slides the holding unit 3 in the radial direction of the winding drum 8. The guide unit 4 has a support unit 4a that is detachably attached to a part of the drum frame 11 (protruding frame 11a) and a sliding unit 4b that moves along the support unit 4a. In this embodiment, the support unit 4a is fixed to the protruding frame 11a that protrudes upward in a triangular shape from the side of the drum frame 11, but the support unit 4a can also be fixed to other parts of the drum frame 11. One longitudinal end of the holding unit 3 is fixed to the sliding unit 4b (cantilever structure). It is also possible to attach support units 4a, 4a to both sides of the drum frame 11 in the width direction, and to create a structure in which the holding unit 3 is hung across and fixed to the sliding units 4b, 4b that slide along the support units 4a, 4a (double-supported beam structure). Various known linear guides can be used as the guide unit 4.

[0023] The maintenance mechanism 5 abuts against the surface of the liner L at the outermost periphery of the winding drum 8, and maintains a constant distance between this surface and the sensor unit 2 in the radial direction of the drum. The maintenance mechanism 5 has a rotating roller 5a that rolls on the surface of the liner L at the outermost periphery as the winding drum 8 rotates, and a connecting body 5b that connects the rotating roller 5a to the holding unit 3. The rotating roller 5a rolls on the widthwise end of the liner L to which the spacer Ls is attached. Due to the presence of the spacer Ls, the widthwise end of the liner L is more rigid and less likely to deform than other parts of the liner L. Therefore, the rotating roller 5a can roll along the longitudinal direction of the liner L, which is substantially free of distortion or vertical waviness.

[0024] The maintaining mechanism 5 is not limited to a configuration having the rotating roller 5a and the connecting body 5b, and other configurations may be adopted. For example, the rotating roller 5a can be replaced by using a material (such as fluororesin) with an extremely low coefficient of dynamic friction for the lower end of the connecting body 5b, or by performing a surface treatment (such as fluorine treatment).

[0025] The outer diameter detection unit 6 detects the winding diameter of the winding drum 8 when the specified detection item P is detected by the sensor unit 2. The winding diameter is the outer diameter of the outermost portion of the sheet S or liner L wound around the winding drum 8. Since the winding diameter of the liner L is easier to detect than that of the sheet S, it is sufficient to detect the winding diameter of the liner L. Since the thickness of the sheet S is known, when the winding diameter of the sheet S is required, it can be calculated based on the winding diameter of the liner L. The outer diameter detection unit 6 can be a known laser sensor or the like that detects the position of the outer edge of the liner L wound around the winding drum 8 when viewed from the side of the drum.

[0026] The calculation unit 7 receives detection data from the sensor unit 2 and the outer diameter detection unit 6. The calculation unit 7 performs various calculations based on the input detection data and other information. A known computer can be used as the calculation unit 7.

[0027] Next, an example of a procedure for detecting the state of the sheet S being unwound from the winding drum 8 will be described.

[0028] As illustrated in Figures 1 to 4, a rotating roller 5a is placed at the widthwise end of the outermost liner L of the winding drum 8 (at a position corresponding to the spacer Ls), and the sensor unit 2 is set at a predetermined position above the center of the widthwise direction of the winding drum 8. The radial distance between the outermost liner L (sheet S) of the winding drum 8 and the sensor unit 2 is determined by the length of the connecting member 5b. Therefore, the connecting member 5b is set to an appropriate length depending on the detectable range of the sensor unit 2 and the position of the detection target.

[0029] In this embodiment, one sensor unit 2 detects two types of detection items P, namely, the width of the sheet S and the widthwise position of the sheet S relative to the winding drum 8, so the detection target position is a range that includes the entire width of the sheet S. Since the sheet S is basically wound around the center in the widthwise direction of the winding drum 8 (liner L), by setting the sensor unit 2 at a predetermined position above the center in the widthwise direction of the winding drum 8, one sensor unit 2 is positioned above the center in the widthwise direction of the sheet S.

[0030] The holding unit 3 may be fixed at a different position in the drum radial direction relative to the connecting body 5b. For example, the holding unit 3 may be slidable in the drum radial direction relative to the connecting body 5b so that it can be fixed at any position. Alternatively, fixing holes (engagement portions) may be formed at intervals in the longitudinal direction (drum radial direction) of the connecting body 5b, and the holding unit 3 may be fixed to the connecting body 5b using each fixing hole (engagement portion). This type of specification makes it possible to appropriately set the radial distance between the outermost liner L (sheet S) of the winding drum 8 and the sensor unit 2 as needed.

[0031] After completing the setting work of the detection device 1 as described above, the winding drum 8 and the liner drum 9 are rotated in opposite directions. As a result, the sheet S unwound from the winding drum 8 passes over the peeling section 11b, and the liner L passes under the peeling section 11b, causing the sheet S and liner L to be peeled off. After passing the peeling section 11b, the sheet S is unwound forward. After passing the peeling section 11b, the liner L moves around the outermost periphery of the winding drum 8 in the drum circumferential direction and is taken up by the liner drum 9.

[0032] As shown in Figure 5, the winding diameter of the winding drum 8 gradually decreases as the wound sheet S and liner L are unwound. The winding diameter of the liner drum 9 gradually increases as the unwound liner L is wound up. As the winding diameter of the winding drum 8 decreases, the sensor unit 2 moves together with the holding unit 3 along the guide unit 4 (support unit 4a) toward the drum shaft 8a (moves radially inward). Therefore, the radial separation distance between the surface of the liner L (surface of the sheet S) at the outermost periphery of the winding drum 8 and the sensor unit 2 is always maintained constant.

[0033] If there is a change in the distance in the drum radial direction between the sensor unit 2 and the sheet S while detecting the detection item P, the change is likely to cause an error in the detection data. However, in this detection device 1, the distance in the drum radial direction between the sensor unit 2 and the sheet S is always constant, so it is possible to suppress errors in the detection data caused by the change in the distance. Therefore, it becomes possible for the sensor unit 2 to accurately detect the width of the sheet S being paid out from the winding drum 8 and its position in the drum width direction relative to the winding drum 8.

[0034] In other words, with this detection device 1, there is no need to perform complex correction processing on the detection data in order to correct errors in the detection data caused by fluctuations in the radial distance between the sensor unit 2 and the sheet S. This detection device 1 has a simple configuration, yet is capable of accurately grasping the state of the sheet S and the liner L.

[0035] The detection data from the sensor unit 2 is input to the calculation unit 7, and the state of the sheet S can be grasped as shown in the example of Fig. 6. The vertical axis in Fig. 6 represents the width of the sheet S and the drum width direction position of the sheet S with respect to the winding drum 8, and the horizontal axis represents the elapsed time (i.e., the longitudinal direction position of the sheet S). The data shown in Fig. 6 makes it possible to grasp the degree of change in the width of the sheet S (shown by a dashed line in Fig. 6) and the degree of meandering (shown by a solid line in Fig. 6). In Fig. 6, the reference line when the sheet S is not meandering is shown by a dashed line.

[0036] When the detection item P is the thickness or surface temperature of the sheet S, the vertical axis of the graph in Figure 6 represents the thickness and the vertical axis represents the surface temperature, respectively. This shows the changes in the thickness and surface temperature in the longitudinal direction of the width of the sheet S. When the detection item P is the presence or absence of defects in the sheet S or the liner L, image data is obtained over time by continuously photographing the sheet S and the liner L. This makes it possible to determine whether or not there is a defect in the sheet S or the liner L.

[0037] The outer diameter detection unit 6 can also detect the winding diameter of the winding drum 8 when the sensor unit 2 detects the detection item P, and input the detection data to the calculation unit 7. The calculation unit 7 associates the detection data by the sensor unit 2 with the winding diameter detection data by the outer diameter detection unit 6. This makes it possible to grasp the correlation between the detection data of the detection item P and the winding diameter of the winding drum 8. For example, it is possible to grasp the correlation such that the width of the sheet S is larger in a portion of the sheet S that is wound closer to the drum shaft 8a on the winding drum 8, and the width of the sheet S is smaller in a portion of the sheet S that is wound farther from the drum shaft 8a (closer to the outer periphery).

[0038] 7, the sheet S is wound around the winding drum 8 with a liner L interposed therebetween. When the sheet S is wound around the winding drum 8 together with the liner L, the detection device 1 can grasp the state of the sheet S (detection item P) using the sensor unit 2 in the same way as in the previous embodiment.

[0039] In this embodiment, the winding drum 8 and the liner drum 9 are rotated in opposite directions by a drive motor 10. Specifically, the winding drum 8 and the liner drum 9 are driven to rotate inward toward each other. The sheet S supplied to the winding drum 8 by a transport conveyor or the like is placed on a liner L unwound from the liner drum 9 and is then wound onto the winding drum 8. In this embodiment, the winding diameter of the winding drum 8 gradually increases as the sheet S and liner L are wound up. The winding diameter of the liner drum 9 gradually decreases as the liner L is unwound.

[0040] As the winding diameter of the winding drum 8 increases, the sensor unit 2 moves together with the holding unit 3 along the guide unit 4 (support unit 4a) toward the drum shaft 8a (moves radially outward). Therefore, the distance in the drum radial direction between the surface of the liner L (surface of the sheet S) at the outermost periphery of the winding drum 8 and the sensor unit 2 is always maintained constant. Therefore, errors in the detection data due to fluctuations in this distance can be suppressed, which is advantageous for accurately detecting the state of the sheet S and liner L being wound onto the winding drum 8.

[0041] Using this detection device 1, the sensor unit 2 may detect the same detection item P when the sheet S together with the liner L is wound onto the winding drum 8 and when the sheet S together with the liner is paid out from the winding drum 8. Then, by comparing the detection data when the sheet S is wound and when it is paid out, it is possible to understand the degree of change in the detection item P while the sheet S (liner L) is wound onto the winding drum 8 and temporarily stored.

[0042] The present disclosure encompasses the following inventions: Invention 1: A state detection device for an unvulcanized rubber sheet that detects the state of the unvulcanized rubber sheet when the unvulcanized rubber sheet is unwound from a winding drum together with a liner and / or when the unvulcanized rubber sheet is wound onto a winding drum together with the liner, An unvulcanized rubber sheet condition detection device comprising: a sensor unit arranged above the winding drum; a holding unit that holds the sensor unit; a guide unit that slides the holding unit in the drum radial direction; and a maintenance mechanism that abuts against the surface of the liner at the outermost periphery of the winding drum and always maintains a constant radial distance between the surface and the sensor unit, wherein specified detection items of the unvulcanized rubber sheet at the outermost periphery of the winding drum are detected by the sensor unit. Invention 2: The condition detection device for an unvulcanized rubber sheet described in Invention 1, wherein the maintenance mechanism has a rotating roller that rolls on the surface as the winding drum rotates, and a connecting body that connects this rotating roller to the holding portion. Invention 3: An unvulcanized rubber sheet condition detection device according to invention 1 or 2, wherein the detection items are at least one of the width, thickness, presence or absence of defects, surface temperature, and widthwise position of the unvulcanized rubber sheet relative to the winding drum. Invention 4: An unvulcanized rubber sheet condition detection device according to any one of inventions 1 to 3, having an outer diameter detection unit that detects the winding diameter of the winding drum when the specified detection item is detected by the sensor unit. Invention 5: 5. The device for detecting a condition of an unvulcanized rubber sheet according to any one of Inventions 1 to 4, wherein the sensor unit detects whether or not there is a defect on the surface. Invention 6: A method for detecting a state of an unvulcanized rubber sheet, which detects the state of the unvulcanized rubber sheet when the unvulcanized rubber sheet together with a liner is unwound from a winding drum and / or when the unvulcanized rubber sheet together with the liner is wound onto a winding drum, A method for detecting the condition of an unvulcanized rubber sheet, in which a sensor unit is held by a holding unit and positioned above the winding drum, the holding unit is made slidable in the drum radial direction by a guide unit, and a maintenance mechanism abuts against the surface of the liner at the outermost periphery of the winding drum to always maintain a constant radial distance between the surface and the sensor unit, and the sensor unit detects specified detection items of the unvulcanized rubber sheet at the outermost periphery of the winding drum using the sensor unit. [Explanation of symbols]

[0043] 1. Detection device 2 Sensor section 3 Holding part 4 Guide section 4a Support column 4b Slide part 5 Maintenance mechanism 5a Rotating roller 5b Connector 6. Outer diameter detection unit 7 Arithmetic section 8-wrap drum 8a Drum shaft 9 Liner drum 9a Drum shaft 10 Drive motor 11 Drum Frame 11a Protruding frame 11b Peeling part S Unvulcanized rubber sheet L Liner Ls spacer

Claims

1. A state detection device for an unvulcanized rubber sheet that detects the state of the unvulcanized rubber sheet when the unvulcanized rubber sheet is unwound from a winding drum together with a liner and / or when the unvulcanized rubber sheet is wound onto a winding drum together with the liner, An unvulcanized rubber sheet condition detection device comprising: a sensor unit arranged above the winding drum; a holding unit that holds the sensor unit; a guide unit that slides the holding unit in the drum radial direction; and a maintenance mechanism that abuts against the surface of the liner at the outermost periphery of the winding drum and always maintains a constant radial distance between the surface and the sensor unit, wherein specified detection items of the unvulcanized rubber sheet at the outermost periphery of the winding drum are detected by the sensor unit.

2. 2. The device for detecting the condition of an unvulcanized rubber sheet according to claim 1, wherein the maintenance mechanism comprises a rotating roller that rolls on the surface as the winding drum rotates, and a connecting member that connects the rotating roller to the holding portion.

3. 3. The unvulcanized rubber sheet condition detection device according to claim 1, wherein the detection items are at least one of the width, thickness, presence or absence of defects, surface temperature, and widthwise position of the unvulcanized rubber sheet relative to the winding drum.

4. 3. The device for detecting the condition of an unvulcanized rubber sheet according to claim 1, further comprising an outer diameter detection unit for detecting the winding diameter of the winding drum when the specified detection item is detected by the sensor unit.

5. 3. The device for detecting the condition of an unvulcanized rubber sheet according to claim 1, wherein the sensor unit detects whether or not there is a defect on the surface.

6. A method for detecting a state of an unvulcanized rubber sheet, which detects the state of the unvulcanized rubber sheet when the unvulcanized rubber sheet together with a liner is unwound from a winding drum and / or when the unvulcanized rubber sheet together with the liner is wound onto a winding drum, A method for detecting the condition of an unvulcanized rubber sheet, in which a sensor unit is held by a holding unit and positioned above the winding drum, the holding unit is made slidable in the drum radial direction by a guide unit, and a maintenance mechanism abuts against the surface of the liner at the outermost periphery of the winding drum to always maintain a constant radial distance between the surface and the sensor unit, and the sensor unit detects specified detection items of the unvulcanized rubber sheet at the outermost periphery of the winding drum using the sensor unit.

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