Method for automatically changing a material cassette in the manufacture of vehicle tyres, comprising the following steps: a) providing a first material cassette having a wound-up first material ply, b) feeding the first material ply by a cassette roller out of the material cassette to a storage loop of a tyre building machine, c) using a stopping device for stopping the material ply in a feeding device, f) using a cutting device, the first material ply being cut through in the feeding device by the cutting device, g) feeding the first material ply back into the first material cassette, h) exchanging the first material cassette for a second material cassette having a new, second material ply, i) feeding the front material end of the second material ply onto the cassette roller of the second material cassette, j) gripping the rear material end of the first material ply by a gripping means, k) joining the rear material end of the first material ply to the front material end of the new, second material ply, the two material ends (13, 14) being joined by an overlapping splice, the gripping means being a suction bar, by which the rear material end of the first material ply is gripped and transported over the cassette roller, the joining of the two material ends (13, 14) taking place by the suction bar on the cassette roller, l) feeding the joined first and second material plies (1, 17) further to the storage loop of the tyre building machine. comprising the following steps: a) providing a first material cassette having a wound-up first material ply, b) feeding the first material ply by a cassette roller out of the material cassette to a storage loop of a tyre building machine, c) using a stopping device for stopping the material ply in a feeding device, f) using a cutting device, the first material ply being cut through in the feeding device by the cutting device, g) feeding the first material ply back into the first material cassette, h) exchanging the first material cassette for a second material cassette having a new, second material ply, i) feeding the front material end of the second material ply onto the cassette roller of the second material cassette, j) gripping the rear material end of the first material ply by a gripping means, k) joining the rear material end of the first material ply to the front material end of the new, second material ply, the two material ends (13, 14) being joined by an overlapping splice, the gripping means being a suction bar, by which the rear material end of the first material ply is gripped and transported over the cassette roller, the joining of the two material ends (13, 14) taking place by the suction bar on the cassette roller, l) feeding the joined first and second material plies (1, 17) further to the storage loop of the tyre building machine. a) providing a first material cassette having a wound-up first material ply, b) feeding the first material ply by a cassette roller out of the material cassette to a storage loop of a tyre building machine, c) using a stopping device for stopping the material ply in a feeding device, f) using a cutting device, the first material ply being cut through in the feeding device by the cutting device, g) feeding the first material ply back into the first material cassette, h) exchanging the first material cassette for a second material cassette having a new, second material ply, i) feeding the front material end of the second material ply onto the cassette roller of the second material cassette, j) gripping the rear material end of the first material ply by a gripping means, k) joining the rear material end of the first material ply to the front material end of the new, second material ply, the two material ends (13, 14) being joined by an overlapping splice, the gripping means being a suction bar, by which the rear material end of the first material ply is gripped and transported over the cassette roller, the joining of the two material ends (13, 14) taking place by the suction bar on the cassette roller, the two material ends (13, 14) being joined by an overlapping splice, the gripping means being a suction bar, by which the rear material end of the first material ply is gripped and transported over the cassette roller, the joining of the two material ends (13, 14) taking place by the suction bar on the cassette roller, l) feeding the joined first and second material plies (1, 17) further to the storage loop of the tyre building machine.