Imprinting problem caused by the misalignment of the front gauge side gauge
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Whether the paper can be accurately positioned and transmitted by the transfer paper is the key to ensuring overprinting. Let's explore some of the more common faults we have in production.
1 The front swing type is too high, or the hem on the hem-type front gauge is too high, causing the leading edge of the paper to be tilted when positioned.
2 The fall time of the front gauge is incorrect and cannot be correctly positioned.
Readjust the fall time (change the position of the cam)
<This kind of situation is generally rare. Sometimes it can be seen after the machine has been overhauled. The usual adjustment procedure is to pull out the positioning pin on the front cam to change the angular position of the cam by adjusting the position of the long hole. After finishing, be sure to re-drill the locating pin hole and insert the locating pin to prevent position change in the future operation.
3 If the front gauge of the pendulum type is to be used for empty sheet inspection, it is easy to block the paper positioning because the reed is too hard. The reeds used in domestic printing presses are not standard parts, and it is easy to have uneven thickness. This kind of situation can be sanded with sandpaper>
Foreign objects (such as paper or ink dots) on the 4 wheels or on the bezel can cause the paper to not reach the positioning position smoothly.
5 The side gauge cover is too high to cause it to be pulled, or it is too low to cause the position to be pulled.
The correct height should be thin paper*3 or thick paper +0.2.
6 If the spring is too tight, it will be pulled or loose, which will not pull the position.
Adjust according to the thickness of the paper
**345 refers to the easy overprinting failure of mechanical side gauges**
Pneumatic side gauges are easily blocked by paper, etc. It is recommended to clean them frequently.
7 The side gauge falls too early, causing the paper to be pressed by the side gauge before it is properly positioned by the front gauge.
Adjust the side gauge to the exact drop time according to the angular position of the machine. Wait until the paper is properly positioned before it can drop the paper (or start the paper suction on the vacuum side gauge).
When adjusting the side gauges, it should be noted that the side gauges should be lifted when the paper feeder bites the paper to avoid the “three nos”, ie the paper is free on the paperboard.