| 摘要 |
PROBLEM TO BE SOLVED: To provide a bag making machine that can make a bag while matching patterns without accumulating a difference in a printing pitch between a front packing material and a back packing material reeled out from two web rolls.SOLUTION: A bag making machine includes: a packing material joining roll 18; an upper packing material feeding roll 16 and upper nip roll 17; a lower packing material feeding roll 24 and lower nip roll 25; an intermediate packing material feeding roll 34 and intermediate nip roll 35; registration mark sensors 51-53; individual moving parts 57a, 57b and simultaneous moving part 57c that move and adjust the first and second registration mark sensors 51, 52; and a shooting indicator 58 that shoots and indicates vertical patterns at a reference position A that matches the patterns, each other. The lengths from the upper nip roll 17 and the lower nip roll 25 to the reference position A are equal. Intermittent rotation is given to the upper and lower packing material feeding rolls 16, 24 and the intermediate packing material feeding roll 34 based on the size of one pitch between the registration marks calculated based on the detection of the registration marks by the corresponding registration mark sensors 51-53. |
