 The Rotomatic 7 drive control panel from Dynaspede is a drive panel tailor-made to suit unwind turret, rewind turret and intermediate sections on a rotogravure printing press. It comprises the following sections:
Unwinder turret controls: In this zone, tension of the web entering the Infeed section is controlled. Motors connected to each unwind shaft will be controlled by four-quadrant digital drives. The controls incorporate feedback of dancer position. All the sequence and logic operations, including pre-drive of fresh roll, turret rotation, roll positioning, bump roll & knife actuation, and retraction are controlled through a suitable PLC with provision for fully automatic/semi-automatic splicing.
Infeed: The Infeed nip unit drive pulls the substrate off the unwinding roll, and simultaneously ensures that tension in the span between the Infeed section and the first printing station is maintained constant.
It maintains set tension independent of whether it is called to drive or to prevent overhauling. An AC or DC motor actuates the Infeed nip through an appropriate mechanical transmission arrangement. Tension transducers or dancer position sensors are used for feedback. Speed-follow-tension-trim (or dancer-trim) controls along with vector-controlled digital AC drive or digital DC drive ensures that process tension is maintained constant.
Main drive: A single AC or DC motor through the line shaft powers all colour stations of the printing section. It is the pilot or master section of the rotogravure printing press. Speed can be set by means of push buttons and monitored by a digital tension readout. The digital AC or DC drive ensures that the set speed is maintained. Acceleration and deceleration times are adjusted on this drive.
Outfeed drive: The Outfeed unit establishes outlet tension values and isolates the processing section from tension disturbances of the rewinder. The principle of operation of the drive and controls in this section will be similar to that of the Infeed. The only difference is that while the Infeed operates at a speed slightly lower than the line speed, the Outfeed operates at a marginally higher speed.
Rewinder turret controls: In this zone, tension of the web coming out of the Outfeed section is controlled. Motors connected to each rewind shaft will be controlled by four-quadrant digital drives. The controls incorporate feedback of dancer position. All the sequence and logic operations including pre-drive of fresh roll, turret rotation, roll positioning, bump roll & knife actuation and retraction are controlled through the PLC with provision for fully automatic/semi-automatic splicing.
7 Drive Rotogravure Press |
A Choice of operator control station is available. Dynaspede offers a freestanding floor-mounted panel as shown alongside. Optional features include PC-based management system for machine control with additional facility for storage of jobs, generating reports and monitoring overall machine performance and output. Temperature controls / indicators, electricals for exhaust / blower motors, heater controls and impressions nip controls are provided on request. 