Recording paper clamping apparatus

Claim 1

Recording paper winding apparatus comprising: a rotary drum having an air-pervious circumferential periphery for winding recording paper thereon, said drum having a longitudinal slot in said periphery; means for creating a negative pressure in said drum when paper is wound thereon; a bar having an L-shaped section arranged with one flange thereof movable radially in said slot and the other flange thereof opposed to said drum periphery for pinching therebetween the front end of recording paper so that rotation of said drum will wind the paper therearound with the paper being held tightly on said drum by the negative pressure therein; means engaged with said bar and drum for urging said bar to pinching position; motor means for driving said drum; and means engageable with said drum for stopping rotation thereof with said bar uppermost when said motor means is shut off, for raising said bar to paper-receiving position, and for allowing said bar to return to paper pinching position after the front end of the paper has been inserted between said one flange and said drum periphery, to wind the paper therearound when the motor means is restarted and thus hold the paper tightly on said drum by the negative pressure therein, said engageable means including: bar-engaging and raising means mounted to the ends of said drum for rotation about the axis thereof and for linear movement diametrically of said axis; disc means mounted to said drum ends for rotation about said axis and having notch means in the periphery thereof; and detent means engageable in said notch means for stopping rotation of said drum with the bar uppermost and for pushing said bar-engaging and raising means upward to engage and raise said bar.