9 is rotatably mounted on the outer circumference of the stationary shaft 11 at one axial end of the core member a metallic flange 12 is formed which acts as an abutment member for holding one side of the supply roll 9 a spacer 32 is sandwiched between the frame 33 of the thermal printer and the flange 12 at the end of the core member 14 on the outer circumference of the stationary shaft 11 there is rotatably mounted a core member 14 an idle rotation restraining or stopping friction means in the form of leaf spring 13 is mounted on the outer circumference of the core member 14 the spring 13 has a free end that engages the interior of the reel 19 of the roll as described below the end of the spring is bent so that it engages the reel obliquely for permitting reel rotation in one direction while digging into the reel and inhibiting reverse rotation against the other axial end of that core member 14 there abuts a collar 16 which is biased toward the frame of the machine and the spacer 32 by an elastic member such as a thrust coil spring 15 a pin p is provided on the stationary shaft 11 a key groove not shown which engages with the pin p is provided in the collar 16 to enable the collar 16 to be integrated.