Drying apparatus with deodorizing system for a printing machine

A drying apparatus with a deodorizing means for a printing machine comprising:

• a hot blast nozzle for directing, a hot blast against a printed web for drying the printed material;
• deodorizing means including a preheating chamber provided with a burner for preheating a collective process gas including a portion of a used process gas already used during drying operation;
• a catalytic layer for oxidizing the used process gas;
• a fan for supplying the used process gas through the catalytic layer to an outlet conduit for said preheating chamber, said outlet conduit including first damper means for dividing a treated process gas, including a hot blast obtained by the treatment with the deodorizing means into two parts and discharging one part of the two parts and a second damper means operatively connected in a returning duct for subdividing the other part into two parts and introducing one part thereof to an odor collective chamber connecting to the preheating chamber and introducing the other part to a hot blast mixing chamber into which the other part of the foregoing used process gas is supplied;
• and
• a hot blast circulating blower for supplying a mixture process gas of the treated process gas and the used process gas in the foregoing hot blast mixing chamber to the hot blast nozzle, said outlet conduit being provided with a first diverging portion between an exhaust duct for discharging part of the treated process gas and said returning duct connected between the deodorizing means and the hot blast mixing chamber;
• said first diverging portion is provided with said first damper means for adjusting diverged amounts of the treated process gas flowing into both the exhaust duct and the returning duct, said first damper means being provided with a control circuit including a first motor and a first switching means for controlling the first damper means to a position for decreasing an amount of the process gas flowing into the exhaust duct when the feeding of the printed sheet is stopped;
• said returning duct being provided with a second diverging portion between the deodorizing means and the hot blast mixing chamber;
• said second diverging portion is provided with said second damper means for adjusting diverged ratio amounts of the treated process gas flowing into the deodorizing means and the hot blast mixing chamber;
• said second damper means is provided with a control circuit including a second motor and a second switching means for controlling the second damper means to adjust an amount of the treated process gas flowing into the hot blast mixing chamber according to increases and decreases of a predetermined set temperature of the mixture process gas contained in the hot blast mixing chamber.