Abstract: An integrated adjustable core support and medium guide device comprises a left support member, a right support member substantially parallel to the left support member, and a connecting mechanism coupled between the left and the right support members at opposite ends, the left support member having a left adjustable core support ear integrated with a left guide wall and a left guide rail, the right support member having a right adjustable core support ear integrated with a right guide wall and a right guide rail, the left and the right core support ears respectively including a semicircular upper half securely coupled to the left and the right support members respectively and including a semicircular lower half movably coupled to the left and the right support members respectively, the lower halves being vertically adjustable and the connecting mechanism being laterally adjustable of its width.

Abstract: A portable printer comprising a door pivotally coupled to a main body of the portable printer at a back end, a printing medium roller support rotatably mounted on the door of the portable printer, a platen rotatably positioned at a front end of the door, a door locking mechanism having a pair of door locking latches respectively positioned at opposite ends of the platen, a roller movably and rotatably coupled to the door locking mechanism and positioned parallel to the platen, a pair of levers movably coupled to the door locking mechanism for pressing the roller against the platen when the door is closed to the main body, a support frame positioned within the main body, a print head pivotally coupled to the support frame, a pair of coil springs coupled between the print head and the support frame such that the print head is essentially floating against the support frame, a body locking mechanism having a pair of body locking latches for latching with respective door locking latches, a gear system coupled to t