Forming drum for producing tyres for vehicle wheels and method for controlling geometry of forming drum for producing tyres for vehicle wheels

Abstract

The invention describes a forming drum (1) for producing tyres for vehicle wheels, comprising: a central shaft (2); the two lateral deposition surfaces (3 and 4) are axially opposite and are driven by the central shaft (2) to rotate; an adjustment linkage (17) configured to axially move the two lateral deposition surfaces (3, 4) and comprising an adjustment shaft (18), at least one actuation device (25) fixedly connected to the adjustment shaft (18), and at least one locking device (26) operating on the actuation device (25) between a first state in which the adjustment shaft (18) is movable relative to the at least one lateral deposition surface (3, 4), and a second state in which the adjustment shaft (18) is movable relative to the at least one lateral deposition surface (3, 4). The locking device prevents rotation between the actuating device (25) and the central shaft (2) in a first state in which the locking device prevents rotation between the actuating device (25) and the central shaft (2) and in a second state in which the locking device allows rotation between the actuating device (25) and the central shaft (2). The locking device (26) defines a plurality of locking positions for the actuating device (25) in a first state, and the actuating device (25) can reach any locking position starting from a previous locking position after a predetermined rotation between the actuating device (25) and the central shaft (2) in a second state of the locking device (26).

Description

technical field [0001] The present invention relates to a forming drum for the production of wheel tires, and a method for controlling the geometry of the forming drum for the production of wheel tires. Background technique [0002] A tire for a wheel generally comprises a carcass structure, a crown structure arranged in a radially outer position relative to the carcass structure, and a pair of sidewalls representing the tire's Axial outer surface. [0003] The carcass structure includes at least one carcass ply formed from reinforcing cords incorporated in a matrix of elastomeric material. The carcass ply has opposite end edges respectively joined to the annular anchoring structure. The annular anchoring structures are arranged in the area of ​​the tire generally identified by the designation "beads" and are generally each formed by substantially circumferential annular inserts called "bead cores" on which at least A filler insert that tapers radially away from the axis ...

AI Technical Summary

Problems solved by technology

[0037] However, the applicant has observed that the "continuous" adjustment of the axial extension of the forming drum requires precise and reliable control over the dimensions achieved; moreover, the mechanisms envisioned for such adjustment must be in each condition of use Keeping the axial extension fixed without allowing "reversible" movement of the members making up the mechanism, for example in the event of an accident or sudden shock during a machining cycle

[0038] More precisely, the Applicant has demonstrated that the continuous measurement of the progressively occupied axial extension of the forming drum may require the use of complex measuring tools which, if used incorrectly, may provide imprecise indications; moreover, during use In , after an axial stress is applied to the sectors, the axial adjustment is slightly reversible due to the loss of the axial position of the sectors due to vibrations or small shocks experienced in the movement of the drum itself

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