(57) The machine comprises an endless belt (1) stretched between two end rollers (2,3).
One roller (2) is driven by a motor for causing translatory motion of the belt (1)
and the other roller (3) acts as a transmission element. At least one printing station
(5) is arranged above the belt (1) and a device (15-15b) for detecting and measuring
the translatory speed of the belt (1) is arranged proximate to the printing station
(5). The device comprises a detector forthe movement and alignment of the belt (1),
comprising a plurality of indicia associated with the belt (1), toothed wheels (15,15a,15b)
adapted for cooperation with the indicia, and an encoder associated with the detector,
for providing output electric signals matching the speed of rotation of the detector,
for convertion, by control members operatively associated with said encoder and with
said belt driving motor, into electric signals for the control of the motor.
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