GALLANTIC1217 CD HIGH SPEED OFFSET PRINTING MACHINE

The GALLANTIC1217 CD HIGH SPEED OFFSET PRINTING MACHINE employs the process of offset lithography to make reproduction of a desired image. Following is a description of the process, which is referenced to shown figure.The process begins when an image is produced on a plate, or master, which is a sheet of metal or special type of paper. The image is made of a substance that has an affinity for grease-containing material, so that printer's ink (greasy) will tend to be held more strongly by the image that by the blank (non-imaged) areas of the plate.Next, water is manually applied to the surface of the plate. This application renders the clear (non-image) area repellent to ink while the image is not materially affected in its affinity for ink. The process is generally referred to as "pre-dampening".At this point, the imaged plate is mounted on the plate cylinder of the machine. Then, the machine is turned on and the cylinders begin to rotate in the directions shown by the arrows in the figure.With the rollers having been properly inked and damped beforehand, the single-lever control is moved to the (damping), position. This brings the damping form roller into contact with the plate on the plate cylinder so that damping in the form of water is applied to the entire surface of the plate. The application of water maintains the condition initially established by pre-dampening procedure.After the cylinders have made four or five revolutions, the single-lever control is moved to the (inking), position. By this action the two ink form rollers also are brought into contact with the plate, and the image becomes inked while the clear area remains free of ink. The ink adheres to the image and is not driven off by the damping because the attractive tendency of the image remains stronger than the repelling tendency of water. This condition is maintained as long as ink and damping are applied in the proper amounts, in which case they are said to be "imbalance".After ink has been applied for three or four revolutions, the single-lever control is move to the Impression, position. This brings the plate cylinder into contact with the rubber blanket on the blanket cylinder, with the result that a reversed (or mirror) image is offset onto the blanket. This image is allowed to build up for a few revolutions of the cylinder before paper is fed.The feeding of paper begins when the pump switch is turned on with the machine running. The vacuum nozzle picks up the topmost sheet and feed in to the pullout wheels, and the pullout wheels feed the sheet onto the conveyer belts of the register board. The belts in turn carry the sheet to the feed rollers. Which in turn feed the sheet to the grippers of the impression cylinder.A mechanism detects the sheet and causes the impression cylinder to press the sheet against the blanket as the sheet passes through in between the impression cylinder and the blanket cylinder. Consequently, the already reversed image on the blanket is impressed upon the sheet and thereby reversed again to become a right-reading image (as is the image on the plate). When the leading edge of the sheet emerges from the nip of the cylinders, the grippers open to release the sheet, at same time the sheet is catch by chain delivery gripper bar?s Gripper Tips & it will carry the sheet to the delivery tray. Their sheet will align & set as stake form.This process goes on revolution after revolution and sheet after sheet until the machine stops or runs out of supplies. The plate is continuously damped and inked, with the flowerets of both ink and water so adjusted that the water input is equal to the water lost to the plate, and the ink input is equal to the amount of ink used by the sheets.