PURPOSE: To switch the positions of pairs of side fences exactly and simply in response to the width of the recording paper used by rotating a cam follower after a cam groove via the rotating operation of a cam member.

CONSTITUTION: To switch the positions of side fences 16, 17 to longitudinally feed the decalcomania paper with an A4 size, a size setting disk (cam member) 38 is rotated counter-clockwise, a cam follower 33 is rotated clockwise after a cam groove 37, an operation lever 32 is rotated clockwise around a pin 31, and a shift plate 19 is moved in the arrow direction via a roller 34 and a pin 35. As a result of this shift, a pinion 26 is rotated in the arrow direction, a shift plate 20 is moved in the arrow direction via a rack 20a, pairs of side fences 16, 17 provided on both plates 19, 20 respectively are separated from each other, and the side fences 16, 17 are faced to each other at a distance in response to the width of the longitudinally fed decalcomania paper with an A4 size.