Method and apparatus for controlling the laying down of components of tyres on forming drums

1. An apparatus for controlling the laying down of components of tyres on forming drums, comprising:

an emission device to send a first electromagnetic radiation incident on a radially external surface of a first laying structure comprising a forming drum and a first component of a tyre laid down on the forming drum;

a detection device configured to detect a corresponding first reflected radiation; and

a processing unit configured to:

determine, as a function of the first reflected radiation a first parameter representative of a first main length of the first component;

compare the first main length with one or more pre-stored reference parameters;

generate a first correction signal as a function of the comparison; and

send the first correction signal to at least a preparation station adapted to prepare the first component to regulate the preparation of further components,

wherein a queue is arranged comprising one or more auxiliary components ready to be laid down on the forming drum, the auxiliary components being prepared by the preparation station before receiving the first correction signal, the processing unit being configured to:

wait until each one of the auxiliary components is laid down on, and afterwards removed from, the forming drum;

identify a second component laid down on the forming drum after the auxiliary components, the second component being prepared by the preparation station after receiving the first correction signal;

when the second component is laid down on the forming drum, activate the emission device to send a second electromagnetic radiation incident on a second laying structure comprising the forming drum and the second component laid down on the forming drum;

detect at least one corresponding second reflected radiation;

determine, as a function of the second reflected radiation detected by the detection device, a second a main length of the second component, wherein the second main length is a circumferential distance between a first end laid down and a second end laid down of the second component;

determine a time parameter representative of a waiting time of the second component after being prepared by the preparation station and before being laid down on the forming drum;

generate a second correction signal as a function of the first main length, of the second main length and of the second time parameter; and

send the second correction signal to the preparation station.

2. The apparatus according to claim 1 , wherein the processing unit, in order to wait until each one of the auxiliary components is laid down on, and afterwards removed from, the forming drum, is configured to:

determine a number N representative of how many auxiliary components are included in the queue; and

verify that N auxiliary components are laid down on, and afterwards removed from, the forming drum.

3. The apparatus according to claim 1 , wherein the emission device and the detection device are mounted on a support structure and are movable along one or more respective guides substantially parallel to a rotation axis of the forming drum.

4. The apparatus according to claim 3 , further comprising at least an actuator active on the emission device and on the detection device to move the latter along the one or more guides.

5. The apparatus according to claim 4 , wherein the processing unit is configured to receive an identification parameter representative of a type and/or of a material of at least the first component.

6. The apparatus according to claim 5 , wherein the processing unit is configured to drive the at least an actuator as a function of the identification parameter.