Device and method for inspecting cylindrical member

1. A method for inspecting a cylindrical member that is molded into a cylindrical shape, comprising:

winding a strip-shaped member around a molding drum;

placing a longitudinal distal end and a longitudinal rear end of the strip-shaped member against each other;

detecting, by using a position sensor, drum-widthwise end positions of the strip-shaped member wound around the molding drum along an entire length of the strip-shaped member in a longitudinal direction thereof;

rotating the cylindrical member while detecting the drum-widthwise end positions of the strip-shaped member;

calculating, by using a control unit, a degree of widthwise misalignment of the strip-shaped member wound around the molding drum on the basis of detection data from the position sensor and position data of drum-widthwise end faces that are perpendicular to a drum axial center of the molding drum; and

determining whether the widthwise misalignment of the strip-shaped member is inside or outside an allowable range on the basis of the calculation result.

2. The method for inspecting a cylindrical member according to claim 1 , wherein

upon molding another strip-shaped member into a cylindrical shape by winding the another strip-shaped member around an outer peripheral surface of the cylindrical member so as to be laminated thereon, drum-widthwise end positions of the another strip-shaped member with respect to the drum-widthwise end faces of the molding drum are detected, by the position sensor, along an entire length of the another strip-shaped member in a longitudinal direction thereof, a degree of widthwise misalignment of the another strip-shaped member is detected, by the control unit, on the basis of detection data from the position sensor, the detection data from the position sensor for the strip-shaped member wound around the molding drum earlier, and the position data of the drum-widthwise end faces of the molding drum, and the widthwise misalignment of the another strip-shaped member is determined to be inside or outside an allowable range on the basis of the calculation result.

3. The method for inspecting a cylindrical member according to claim 2 , wherein

a control unit calculates, on the basis of the detection data from the position sensor with respect to the another strip-shaped member, average lines which are obtained by averaging out the drum-widthwise end positions of the another strip-shaped member over a whole circumference; and

the degree of the widthwise misalignment of the another strip-shaped member is calculated on the basis of position data of the average lines and position data of the drum-widthwise end faces of the molding drum;

the control unit calculates the degree of an offset amount of the another strip-shaped member with respect to the strip-shaped member wound around earlier on the basis of position data of the average lines of the another strip-shaped member and position data of the average lines of the strip-shaped member wound around the molding drum earlier; and

the offset amount is determined to be inside or outside the allowable range on the basis of the calculation result.

4. The method for inspecting a cylindrical member according to claim 1 , wherein,

a position of the longitudinal distal end and a position of the longitudinal rear end of the strip-shaped member molded into the cylindrical shape on the molding drum are detected by the position sensor, a matching length, over which the longitudinal distal end and the longitudinal rear end of the strip-shaped member are matched up with each other, is calculated, by the control unit, on the basis of detection data from the position sensor, and

whether a spliced state of the strip-shaped member is appropriate is determined on the basis of the calculation result.

5. The method for inspecting a cylindrical member according to claim 1 , wherein

a thickness of the strip-shaped member molded into the cylindrical shape on the molding drum is detected, by a thickness sensor, in a peripheral area over which the longitudinal distal end and the longitudinal rear end of the strip-shaped member face each other and whether a spliced state of the strip-shaped member is appropriate is determined on the basis of detection data from the thickness sensor.

6. The method for inspecting a cylindrical member according to claim 1 , wherein

the control unit calculates, on the basis of the detection data from the position sensor, average lines which are obtained by averaging out the drum-widthwise end positions of the strip-shaped member over a whole circumference; and

the degree of the widthwise misalignment of the strip-shaped member is calculated on the basis of position data of the average lines and position data of the drum-widthwise end faces which are perpendicular to the drum axial center of the molding drum.

7. A device for inspecting a cylindrical member that is molded into a cylindrical shape by winding a strip-shaped member around a molding drum and placing a longitudinal distal end and a longitudinal rear end of the strip-shaped member against each other, the device comprising:

a position sensor configured to detect drum-widthwise end positions of the strip-shaped member wound around the molding drum along an entire length of the strip-shaped member in a longitudinal direction thereof;

a driving mechanism that drives the molding drum such that the molding drum rotates; and

a control unit into which detection data from the position sensor is input and which controls the driving mechanism to drive the molding drum during detection of the drum-widthwise end positions of the strip-shaped member by the position sensor, wherein

position data of drum-widthwise end faces that are perpendicular to a drum axial center of the molding drum is input into the control unit in advance, a degree of widthwise misalignment of the strip-shaped member wound around the molding drum is calculated by the control unit on the basis of detection data from the position sensor and the position data of the widthwise end faces of the molding drum, and the widthwise misalignment of the strip-shaped member is determined to be inside or outside an allowable range on the basis of the calculation result.

8. The device for inspecting a cylindrical member according to claim 7 , wherein

upon molding another strip-shaped member into a cylindrical shape by winding the another strip-shaped member around an outer peripheral surface of the cylindrical member so as to be laminated thereon, drum-widthwise end positions of the another strip-shaped member are detected, by the position sensor, along an entire length of the another strip-shaped member in a longitudinal direction thereof, a degree of widthwise misalignment of the another strip-shaped member is detected by the control unit on the basis of detection data from the position sensor, the detection data from the position sensor for the strip-shaped member wound around the molding drum earlier, and the position data of the drum-widthwise end faces of the molding drum, and

the widthwise misalignment of the another strip-shaped member is determined to be inside or outside an allowable range on the basis of the calculation result.

9. The device for inspecting a cylindrical member according to claim 8 , wherein

a control unit calculates, on the basis of the detection data from the position sensor with respect to the another strip-shaped member, average lines which are obtained by averaging out the drum-widthwise end positions of the another strip-shaped member over a whole circumference;

the degree of the widthwise misalignment of the another strip-shaped member is calculated on the basis of position data of the average lines and position data of the drum-widthwise end faces of the molding drum;

the control unit calculates the degree of an offset amount of the another strip-shaped member with respect to the strip-shaped member wound around earlier on the basis of position data of the average lines of the another strip-shaped member and position data of the average lines of the strip-shaped member wound around the molding drum earlier; and

the offset amount is determined to be inside or outside the allowable range on the basis of the calculation result.

10. The device for inspecting a cylindrical member according to claim 7 , wherein

a position of a longitudinal distal end and a position of a longitudinal rear end of the strip-shaped member molded into the cylindrical shape on the molding drum are detected by the position sensor, a matching length, over which the longitudinal distal end and the longitudinal rear end of the strip-shaped member are matched up with each other, is calculated by the control unit on the basis of detection data from the position sensor, whether a spliced state of the strip-shaped member is appropriate is determined on the basis of the calculation result.

11. The device for inspecting a cylindrical member according to claim 7 , further comprising a thickness sensor configured to detect a thickness of the strip-shaped member molded into the cylindrical shape on the molding drum, in a peripheral area over which the longitudinal distal end and the longitudinal rear end of the strip-shaped member face each other, wherein

whether a spliced state of the strip-shaped member is appropriate is determined on the basis of detection data from the thickness sensor.

12. The device for inspecting a cylindrical member according to claim 7 , wherein

the control unit calculates, on the basis of the detection data from the position sensor, average lines which are obtained by averaging out the drum-widthwise end positions of the strip-shaped member over a whole circumference; and

the degree of the widthwise misalignment of the strip-shaped member is calculated on the basis of position data of the average lines and position data of the drum-widthwise end faces which are perpendicular to the drum axial center of the molding drum.