Patent ID: 7753308

Claim:
A roll paper winding slack preventing mechanism, wherein a first rotation support member, a second rotation support member, and an inclined surface are provided in a housing, said second rotation support member is disposed in said housing so as to be rotatable on its own axis and movable in a horizontal direction, a position of said first rotation support member is set higher than that of said second rotation support member and the position of said second rotation support member is set lower than that of said inclined surface, when a roll paper is held in said housing with no winding slack, a wound portion of said roll paper is supported by said first rotation support member and said second rotation support member, and said first rotation support member and said second rotation support member rotate in one direction, respectively, and when said wound portion of the roll paper is displaced due to vibration or impact, said wound portion of the roll paper rides on said inclined surface and then slides down said inclined surface to push said second rotation support member so that said second rotation support member rotates in a direction opposite to said one direction and moves in the horizontal direction, while said wound portion of the roll paper rotates in a direction to eliminate winding slack of said roll paper.