Analysis of Overall Walking Causes in Carton Printing (1)

The printing quality of carton printers is generally understood as two aspects. On the one hand is the clarity of printing, including the consistent color depth, pattern no adhesion, no ghosting, no bottom leakage. On the other hand, the overprint accuracy of multi-color printing should generally be within ±1 mm, and a good printing press can be within ±0.5 mm or even ±0.3 mm. In fact, the printing press also has a very important printing quality indicator - the overall printing position, that is, several color registration accurate, but are inconsistent with the paperboard datum spacing, the error is larger. Due to the lax requirement of the general quality of the carton box, it is easily overlooked. If the overall walking error exceeds 3mm or 5mm, the problem is more serious.

Regardless of the chain feed or automatic feed (post feed or leading feed), the reference edge of the overall print position is perpendicular to the paper board transport direction, and the whole direction (paper feed direction) is less likely to generate an overall pass (unless The cardboard runs obliquely). This article will analyze the reason why the post-push paper automatic printing press prints the overall position.

The paper feeding of the automatic paper feeding printing machine is carried out by pushing the paper board to push the bottom sheet of the paper board forward to the upper and lower conveying rollers, and conveyed by the upper and lower conveying rollers forward to the printing department. paper. Analyzing the transport process of the cardboard can help us find the reason for the overall walk.
First of all, in the paper pushing process, the drive chain of the push paper board must not have a large accumulation gap. The automatic paper feed printing machine pushes the paperboard in a reciprocating linear motion. Most manufacturers use a crank (slider) guide rod mechanism plus a rocker slider mechanism. In order to make the mechanism light and wear small, the slider of the crank slider guide mechanism is a bearing. Because the gap between the bearing and the two slides is too large, the uncertainty of the movement of the push-pull board may be caused, thereby causing a paper feed error and causing the print to take an overall position. Therefore, it is crucial to ensure that the bearing performs pure rolling between the two slide plates of the guide bar without making the bearing and the two sliders have large gaps. With the double bearing structure, whether the bearing moves down or moves up along the slide plate, the pure rolling without clearance between the two slide plates can be ensured, so that the mechanism can not only be lightly worn but also can eliminate the gap.