A method of manufacturing a raw tire of one aspect of the present disclosure includes: winding a strip-shaped body on a forming drum in a circumferential direction, and overlapping and joining together respective end portions of the strip-shaped body in a winding direction so as to form a joined portion; and layering a ribbon on the strip-shaped body by winding the ribbon on the strip-shaped body in a direction in which the ribbon runs up onto a step of an end portion that is positioned at a radial direction outer side among the respective end portions configuring the joined portion.

A supply apparatus of tire material members includes a feeder that feeds out first and second continuous material members from which first and second material member is to be cut out, respectively, a conveyer that conveys the first and second continuous material members, a cutter that cuts the first and second continuous material members at a cutting position extending perpendicularly to a conveyance direction every time when the first and second continuous material members are conveyed by a predetermined length, a position detector that detects positions of the first and second continuous material members during a conveyance by the predetermined length from the cutting position, and a position adjuster that, during the conveyance by the predetermined length from the cutting position, adjusts conveyance distances of the first and second continuous material members based on the detected positions of the first and second continuous material members.

A method of manufacturing a pneumatic tire comprising a belt which is wound with a belt-under diameter D outside a carcass ply in a tire-radial direction, includes preparing a strip-like rubber-coated cord member where a plurality of belt cords which are arranged approximately parallel are coated with rubber and a width of the cord member in a lateral direction is D sin . The cord member is cut at the cord angle with respect to a longitudinal direction to cut out a belt forming member having a parallelogram which includes circumferential direction sides extending in a tire circumferential direction in a wound state and formed as cut portions and inclined sides extending parallel to the belt cord and defined as both side portions of the cord member. The belt forming member is wound into a circular cylindrical shape and joined the inclined sides which face each other to each other.

A belt layer of a pneumatic tire includes a first main working belt, a second main working belt arranged at an outer side of the first main working belt in a tire-radial direction, the second main working belt having a cord angle which differs from a cord angle of the first main working belt in a direction with respect to a tire-circumferential direction, and a reinforcement belt. A cord angle of the reinforcement belt is not smaller than 6 degrees and not larger than 9 degrees. a width of the reinforcement belt is equal to or wider than 50% of a tire-section width and not wider than a width of a narrower one of the first and second main working belts, and is equal to or wider than 30% of a periphery length of the carcass and not wider than 50% thereof.

A method of manufacturing a pneumatic tire includes preparing a belt forming member formed of belt cords arranged parallel and covered with rubber. In a development state, the belt forming member is formed into a parallelogram, so that in a state wound with the belt cords extending in a direction inclined at a cord angle , the belt forming member is formed into a circular cylindrical configuration where a belt-under diameter D is not smaller than 940 mm and not larger than 960 mm and a belt width W is not smaller than 270 mm and not larger than 310 mm, and the cord angle , the belt-under diameter D and the belt width W satisfy a relationship of 0.577 DW/tan<1.07D. The belt forming member is wound and joined at a joint portion where the inclined sides are brought into contact with each other.

Disclosed is a dual tire component servicer and a method for supplying a first tire component and a second tire component to a tire building drum, wherein the dual tire component servicer includes a first conveyor and a second conveyor for conveying the first tire component and the second tire component, respectively, in a supply direction towards the tire building drum. The dual tire component servicer further includes a first pick-and-place unit and a second pick-and-place unit for transferring the first tire component and the second tire component, respectively, from their respective conveyors to the tire building drum. The first pick-and-place unit and the second pick-and-place unit are automatically and independently movable relative to each other in a lateral direction perpendicular to the supply direction.

The cutting system is configured to cut a continuous strip which extends lengthwise in a longitudinal direction and widthwise between a first edge and a second edge into strips. The cutting system includes a drive device which imparts to the continuous strip a feed speed, a first cutting roller and a contrarotating second cutting roller that cooperate to cut the continuous strip across its full width. The first cutting roller is provided with a first helical blade and is driven in rotation A variable synchronizer makes it possible to select and to modify the synchronization ratio between the rotational speed of the first cutting roller and the non-zero forward speed of the continuous strip in such a way as to be able to adjust the cutting angle according to which the cross-section of the continuous strip is oriented with respect to the longitudinal direction of the continuous strip.

A process for building tyres for wheels of vehicles, with the following building operations: winding a cut-to-size semifinished element around a forming drum, thereby forming a corresponding component of a tyre, wherein the semi-finished element has opposite ends juxtaposed with each other to form a junction zone; repeating the winding operation until completion of the building operations on the forming drum. During the building operations, a checking operation is performed on the tyre, including: acquiring a two-dimensional image of the tyre; identifying, in the image, at least one junction zone in a radially external position of the tyre; providing reference images, each representing a junction zone type; comparing the at least one identified junction zone with each reference image; selecting a junction zone type; classifying the at least one identified junction zone on the basis of the junction zone type; and generating a stop or a consent signal.