Patent ID: 8182163

Claim:
A label roll positioning device for a barcode printer comprising: at least one slide rail and one positioning rail arranged in a parallel manner inside a housing of the barcode printer, the positioning rail having teeth formed on a surface thereof; and at least one pair of roll retainers, at least one of the roll retainers having a mounting portion disposed at a bottom portion thereof and slidably fit to the slide rail for being slidable along the slide rail, the roll retainers having top portions opposing each other and configured to receive a label roll therebetween, the at least one roll retainer having a longitudinally extended accommodation chamber that has a projection notch formed through a lower end thereof disposed in correspondence with the teeth of the positioning rail, the at least one roll retainer having a longitudinally extended guide rail formed inside the accommodation chamber, the at least one roll retainer including: (a) positioning plug being received in the accommodation chamber and being longitudinally displaceable therein, the positioning plug having a U-shaped cross-sectional contour to define a longitudinally extended slotted opening therein, the longitudinally extended slotted opening of the positioning plug being fit over the guide rail, the positioning plug further having an operation handle extending laterally therefrom and a locking section formed at a longitudinal end thereof and disposed in correspondence with the projection notch; and (b) a face panel forming a closure for the accommodation chamber, the face panel having an operation opening formed therethrough and through which the operation handle of positioning plug extends and is longitudinally displaceable therein, whereby the positioning plug is reversibly longitudinally displaceable responsive to corresponding displacement of the operation handle within the operation opening to thereby selectively extend the locking section through the projection notch and engage the locking section with the teeth of the positioning rail for fixing the at least one roll retainer at a selected position.