Common paper feeder failures and solutions

One, universal shaft failure

Because some printing machine knuckle shaft fork exposed, making paper powder and other fine particles easily stay in the cardan shaft fork and the connection between the ball, over time, resulting in two fork wear, with the increase in clearance, transmission time The vibration will be generated and reflected on the paper. It will cause jitters and result in unstable paper feeding.

Solution: Replace the worn cardan shaft yoke and connecting ball. When replacing the cardan shaft fork, it is necessary to pay attention to make the two fork planes into a plane, otherwise it will generate a new vibration source.

Second, the poor maintenance of the gas distribution valve

Because paper powder and sand particles are often sucked into the air intake valve by the suction nozzle, over time, the wear of the valve body and the valve housing is exacerbated, and some operators are improperly manipulating the wind groove of the valve body, causing the paper feed nozzle to work. In the extreme position, when the take-up roller is pressed down, the suction nozzle still has suction force, and the paper feeding process generates a pause. This phenomenon has a great influence on the accuracy of overprinting of products, and it plagues the operators.

Solution: Remove the air distribution valve and observe the damper of the valve body. If the wear is severe, clean the air duct. Use the welding rod to fill the tail of the air duct about 2~4mm (depending on the pause time and corrective action). .

Third, gear wear and pin break

A pair of bevel gears on the side of the clutches of the paper transport, because the whole gear is exposed, the working environment is rather harsh. If the maintenance is not proper, the wear of the tooth surface is easily aggravated, and the matching relationship between the bevel gear and the inside key becomes a clearance fit, resulting in walking. Paper jitter and a series of unsteady phenomena. Sometimes due to long-term lack of oil rust rust or other parts of the valve caused by the failure of excessive force caused by a pin break, causing the host and the feeder with the wrong time, with printing trouble.

Solution: If the gear or square key is worn, replace it. If the pin is broken, you should find out the reason of the break and carefully check whether the pins have fever or iron powder. It should be eliminated according to the actual situation. .

Of course, in addition to the above-mentioned factors that cause uneven paper feeding, brake spring pressure springs that are too loose, roller bearings bearing loose, and separation heads entering the head pins of the connecting rods can also cause unsteady paper feeds. Then repeat them one by one.