Book edge printing method and book edge printing machine

Abstract

The invention provides a book edge printing method. The method comprises the steps that to-be-printed book edges of multiple book blocks are arranged upwards and aligned, a partition plate is arrangedbetween every two book blocks, the multiple book blocks are clamped through a clamp baffle, and the color and / or gray scale of the partition plates and the clamp baffle and the color and / or gray scale of the book edges have recognizable color difference and / or gray scale difference; the multiple clamped book blocks are placed below a printing spray head; the boundary of the book edges is recognized through the color difference and / or gray difference between the partition plate and the book edges and between the clamp baffle and the book edges, the printing starting position of each book blockis calculated, and the width size of each book block is calculated; a pattern to be printed is stretched according to the width size to obtain a corrected image; and the printing spray head is movedto the printing starting position of each book block, and the printing spray head sprays and prints the corrected image corresponding to each book block to the book edge. By recognizing the book edgeboundary and adjusting the image width, the book edge printing quality is improved.

Description

technical field [0001] The invention relates to the field of printing, in particular to a book edge printing method and a book edge printing machine. Background technique [0002] With the improvement of people's living standards, more and more people read books, and not only have higher expectations for the content of books, but also have more and more sophisticated requirements for the external decoration and aesthetic design of books, which requires booksellers Constantly strive for perfection, especially the details of book decoration, to enhance readers' reading pleasure. In addition to the effect of the cover and back cover, the decoration of the book also includes the printing effect of the side of the book. [0003] The Chinese patent application with the application number 201710127394.0 provides a method of edge printing to achieve color printing on the edge of the book. In this method, the edge of the book block faces upwards, in the area surrounded by the front ...

AI Technical Summary

Problems solved by technology

[0005] (1) if figure 1 As shown, when printing the side 11 of the top of the book block or the side of the foot of the book block, ideally they are rectangular, and the width of the spine 13 side of the book block should be equal to the width of the front mouth 12 side of the book block, but due to After the book block spine 13 side is processed such as glue binding, thread sewing, and saddle stitching, the width of the book block spine 13 side will be thicker than the book block front mouth 12, such as figure 2 As shown, the actual state is not a strict rectangle, but will produce deformation on the spine side after processing 14, if printed according to the ideal state, it will cause partial loss of the image on the spine side

[0006] (2) After the book block and the partition are clamped by the clamp, the ideal state is as follows image 3 As shown, the spacing between the partition and the book block is evenly distributed, but in actual printing it is as follows Figure 4 As shown, the spacing between the book block and the divider is uneven

The printed image is produced according to the ideal state of uniform distribution. In order to overcome the problem of uneven spacing between the book block and the partition, the image required for actual production is larger than the book block, that is, the image bleeds, and the bleeding part will be printed on the partition. board, which can cause deviations in image position and size for each book block

[0007] (3) Ideally, the height of the book block is the same, but in actual production, some book blocks and partitions in the middle of the clamping will bulge, such as Figure 5 As shown, the print head is easy to hit the raised part, which will interrupt the printing process. If the distance between the print head and the edge of the book is increased to avoid the print head from being damaged, the farther the print head is from the surface of the substrate, the worse the printing image quality will be. This leads to a decrease in the printing quality of the image on the edge of the book. At the same time, due to the inconsistent distance between the edge of the book and the nozzle, the quality of the printing is also uneven.

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