Label roll holder returning mechanism for barcode printer

A label roll holder returning mechanism for a barcode printer, comprising:

• at least one restoration roller, which forms at least one positive-movement engagement section, the restoration roller being rotatably mounted to a bottom of a chassis of the barcode printer;
• at least one coiled resilient element, which is received and retained inside a lower portion of the restoration roller and has an inner end coupled to the bottom of the chassis of the barcode printer and an outer end coupled to the restoration roller to provide the restoration roller with a restoration force for rotation thereof;
• at least two movable rails, which are set in the bottom of the chassis of the barcode printer in a substantially parallel manner, the movable rails each forming a counterpart positive-movement engagement section corresponding to and engaging with the positive-movement engagement section of the restoration roller so that the restoration force of the restoration roller is allowed to act on the movable rails to induce linear and reciprocal motion of the movable rails;
• at least two label roll holding elements, which are fixed at a top of the chassis of the barcode printer, the label roll holding elements forming label roll clamping sections to clamp a roll of label therebetween, the label roll holding elements being respectively attached to the movable rails so that the label roll holding elements are caused by the restoration force of the restoration roller to selectively move outward for separation from each other or move inward to approach each other by means of the linear motion of the movable rails.