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The J2205 two-color and J2108 monochrome offset presses produced by the Beijing People's Printing Machinery Plant are controlled by the time difference between the front gauge and the magnetic switch. With the use of this control, often due to the improper adjustment of the time between the front gauge and the magnetic switch, there often occurs a combined pressure and paper feed, that is, shut down, so that the machine can not work properly; or after the machine is pressurized, there is an empty sheet. Paper feeding keeps the rubber belt dirty and can't print out good products. Therefore, adjusting the time difference between the front gauge and the magnetic switch is the premise of air tension control.
So, how to adjust the time difference between the two? Here, I introduce a very simple and feasible adjustment method: open the paper feeder, press the bell button, then press the positive button, the machine runs slowly forward, When the current gauge falls and the electric tooth contacts the fuselage, see if the metal plate of the magnetic switch begins to enter the working state. If it does not enter the working state, adjust the metal plate of the magnetic switch so that it can enter the working state.
Front gauge and magnetic switch working time adjustment tips
In offset printing, air tension control is indispensable. If the control of air tension fails, it is possible that several sheets or even several tens of sheets of paper are sent to the impression cylinder, causing the machine to overload, jam, and squeezing the blanket. In severe cases, the surface of the impression cylinder may be depressed. . If the main motor does not have an overload protection device, it is very likely to be burned out, which will bring significant economic losses to the company. Therefore, air-break control must be well utilized.