Horizontal adjustment device of upper base of barcode printer

A horizontal adjustment device of an upper base of a barcode printer, comprising:

• a chassis of the barcode printer, which forms at least one threaded hole;
• a printing-device upper base being mounted to a side wall of the chassis of the barcode printer and providing a function of printing labels, the printing-device upper base forming therein a through bore, the through bore having an end where a coupling mouth is formed, the printing-device upper base having a front face forming an opening through which a carbon ribbon and label paper pass through;
• at least one adjustment bolt having an end forming at least one screwing engagement section, the adjustment bolt having an opposite end forming a fitting section, the fitting section forming a locking threaded hole, an end of the fitting section extending from one side of the chassis of the barcode printer through the threaded hole of the chassis and further extending through the through bore of the printing-device upper base to fit into the coupling mouth, the coupling mouth receiving a bolt inserted from outside to engage and lock the threaded hole, whereby the fitting section is rotatably coupled to the coupling mouth of the through bore of the printing-device upper base, the screwing engagement section being in engagement with the threaded hole of the chassis of the barcode printer;
• at least one adjustment threaded fastener engaging an end of the screwing engagement section of the adjustment bolt so that the adjustment threaded fastener serves as an element for stopping rotation of the screwing engagement section of the adjustment bolt within the threaded hole of the chassis of the barcode printer, whereby through clockwise or counterclockwise rotation of the adjustment threaded fastener, the adjustment bolt is caused to rotate clockwise or counterclockwise to have the screwing engagement section of the adjustment bolt move through engagement with the threaded hole of the chassis of the barcode printer, so as to move the printing-device upper base horizontally toward left or right and thus adjusting a left-side end gap or a right-side end gap of a label paper roll of the label paper.