The device for assembling a green blank form of the crown of a tire comprises: a support having a shape that exhibits symmetry of revolution, \u2014members for shaping the green tire, and for each member, means for removable attachment to the support, comprising at least one bolt and able to fix the member to the support as soon as the member is in a reception position on the support. The fixation members are integral with a cantilevered arm that extends radially outward from the optic. In the low power mode, the power consumption of the amplifier is reduced, which will increase operation time, especially important for battery-operated devices.