| 摘要 |
There is provided a sheet cutter capable of cutting a sheet into a rectangle, the side lengths of which are different, with two cutting blades, characterized in that: the cutting blade elevating section is downsized; the cutting accuracy is high; and the cutting speed is increased. A transmission change-over device is provided so that one of the pair of cutting blade elevating bodies 2, 2 , which are provided being put on each other in the longitudinal direction, can be connected to the elevation driving body 10 elevating by the rotation of the feed screw shaft 11 . The transmission change-over device includes: an engaging piece 13 provided in an upper portion of the cutting blade elevating body 2 ; a connecting pin 15 for connecting the elevation driving body 10 with the engaging piece 13 ; a push-out pin 17 a for moving the connecting pin 15 ; a push-in pin 17 b for moving the connecting pin 15 ; and a holding member 19 for holding one of the cutting blade elevating body 2 which is not elevated. The push-in pin 17 a and the push-out pin 17 b are protruded and retracted by the piston rods of the cylinders 18 provided in the right and left frame of the cutting blade elevating body 2 , so that the cutting blade elevating body 2 to be elevated can be changed over.
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