Printed Unit Block Aligning Device and Printed Unit Block Aligning Method

A printed unit block aligning method of cutting a large sheet with multiple prints having an imposition structure in vertical lines and horizontal lines into printed unit blocks, aligning the printed unit blocks, and transferring the printed unit blocks at a speed constant for any imposition structure to a subsequent step, the method comprising:

• a primary cutting step of cutting a large sheet block including a stack of the large sheets into line unit blocks arranged side by side;
• a secondary cutting step of cutting the line unit block into printed unit blocks;
• a vertically feeding step of feeding a group of the printed unit blocks vertically and charging the printed unit blocks in each line unit block on an upper rail;
• a horizontally feeding step of releasing the printed unit blocks from the upper rail, dropping the printed unit blocks onto a lower rail group perpendicular to the upper rail, receiving each of the printed unit blocks in a group in each line unit block, and feeding the group of the printed unit blocks horizontally;
• and
• an alignment transferring step of receiving the group of the printed unit blocks in each line unit block fed horizontally and transferred from the lower rail group with supporting means, releasing the supporting means and making an alignment transfer rail receive the group of the printed unit blocks, aligning the group of the printed unit blocks in each line unit block in a vertical direction, and feeding the group of the printed unit blocks vertically, wherein
• in the alignment transferring step, electrical controlling means is provided that electrically controls timing of drop from the supporting means onto the alignment transfer rail, and the electrical controlling means controls timing of drop in a manner that depends on the numbers of layers in each vertical line in different imposition structures while determining a speed of transfer in the horizontal feeding and transferring step to be uniform for any imposition structure.