US 4,238,999 AGranted

Rotary cylindrical screen printing apparatus for specularly printing equal patterns and/or colors onto the opposite faces of fabrics or the like

AssigneeReggiani Macchine S.p.A.

InventorsAdolfo Giani, Mario Panseri, Umberto Mascioni

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Abstract

A rotary cylindrical-screen printing apparatus for specularly printing equal patterns and/or colors onto the opposite faces of a fabric is disclosed, comprising two rotary screen printing machines, each equipped with electromechanical means for synchronizing the speed of the belt with the speed of the printing rollers, in which said machines are coupled by arranging one machine over the other, the fabric entering the underlying machine and thereafter entering the second upper machine which prints the opposite face of the fabric, the second machine comprising a transmission roller associated with its belt having a diameter equal to at least twice the diameter of the contiguous roller of the first machine, the apparatus comprising means for synchronizing the speeds of the printing rollers of two machines, including a transducer linked to the speed of the belt of a machine, whose outgoing frequency signal is sent to pilot the electrohydraulic motors controlling the printing rollers of both machines and means for synchronizing the speeds and phase of the two belts by linking the speed of the belt of one machine with the speed of the other belt through digital-analogue converters effecting a comparison between frequency signals picked up proportionally to the speeds of the two belts so as to emit a signal for the correction of speed and phase, said signal being sent to a means for driving the belt of the controlled machine.

Claims6

Dependent claims

A rotary cylindrical-screen printing apparatus for specularly printing equal patterns or colors onto the opposite faces of a fabric comprising:

first and second rotary cylindrical screen printing machines of the type having a carrier belt and transmission roller for supporting and moving fabric with respect to a printing roller, said machines being connected with each other, said first machine being supported above said second machine;
means for feeding said fabric to said second machine, whereby printing on one face occurs;
means for feeding printed fabric exiting said second machine to said first machine whereby the opposite face of the fabric is printed;
said upper machine transmission roller having a diameter equal to at least twice the diameter of the transmission roller of the underlying machine;
means for synchronizing the speeds of the printing rollers of the two machines, including a transducer means interlocked to the speed of the belt of one machine, having an outgoing frequency signal sent to first and second electrohydraulic motors for controlling the printing rollers of each machine;
and
means for synchronizing the speed and phase of the two belts by interlocking the speed of the belt of one machine with the speed of the other belt comprising digital-analog converter means for effecting a comparison between the speeds of the two belts so as to emit an outgoing signal for the correction of speed and synchronization;
and
means for controlling the speed of each belt in response to said outgoing signal whereby said belts are synchronized.

6 more elements

Dependencies are inferred from the claim text.