Patent ID: 8564634

Claim:
An aligning device for a printing member in a printer, the printer including a supplying unit configured to hold a rolled printing member in a one-end supporting manner; and a printing unit configured to print information of a predetermined content on the printing member that is fed in a strip from the supplying unit to a transfer path, wherein the supplying unit includes: an attachment tubular shaft having a cylindrical shaft to which a core tube of the printing member is applied from a free end of the cylindrical shaft, and a one-side contact circular plate disposed at a push-in end of the cylindrical shaft which is on an opposite side from the free end, a pinion rotatably provided within the cylindrical shaft of the attachment tubular shaft and on a line across a width direction of the transfer path, a pair of racks extending along an axial direction of the cylindrical shaft, the racks being so positioned and also engaged with the pinion such that the pair of racks are movable in opposite directions from each other; a push-in projection at a one-side contact end of one of the racks and also projecting in a radial direction of the cylindrical shaft, and configured to push the one of the racks toward the push-in end of the cylindrical shaft by means of a core tube of the printing member; a positioning projection swingably attached to a positioning end of the other of the racks, and configured to detachably engage with any of a plurality of positioning engagement holes defined in the cylindrical shaft, each engagement hole is at a predetermined interval along the axial direction from the other engagement holes, wherein the push-in projection drives the racks and the pinion by the pushing of the core tube toward the push-in end of the cylindrical shaft, and the positioning projection engages with one of the positioning engagement holes in the cylindrical shaft at a position at which the core tube is determined to be at a central position across the width direction of the transfer path, whereby the core tube is positioned at the central position across the width direction.