| 摘要 |
PROBLEM TO BE SOLVED: To enable a blade to linearly move up and down without rotating in a chopper folding device. SOLUTION: In the chopper folding device is provided with a gear mechanism comprising a first internal tooth gear 23 for which rotation is restricted, a first external tooth gear 21 to engage with the first internal teeth gear 23, and a second external tooth gear 20 to engage with the first external tooth tear 21. The blade 11 arranged parallel to the traveling direction of a signature 1 is fixed on a the second external tooth gear 20. The distance from the center of the first internal tooth gear 23 to the center of the first external tooth gear 21 and the distance from the center of the first external tooth gear 21 to the center of the second external tooth gear 20 are set to be equal. A driving means rotatively drives the first external tooth gear 21 around the central axis of the first internal tooth gear 23 while controlling means 12, 13, 24, 25 restricting movement of the position of the center of the second external tooth gear 20 to be on a line extending in a diameter direction of the first internal tooth gear 23.
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