Thermal printer ribbon cartridge for wide ribbons

Abstract

A user-friendly ribbon cartridge to house and to facilitate handling a wide thermal transfer ribbon for a thermal color printer is composed of first and second casing sections which define a slotted let-off tube and a slotted take-up tube and turnbar. A pair of casing end pieces connect the corresponding ends of the casing sections so that they are juxtaposed with their axes parallel to one another so as to define a plane and the turnbar is spaced parallel to that plane so that a stretch of ribbon wound about cores rotatively mounted in the tubes can extend out through the tube slots and over the turnbar creating a large unobstructed planar ribbon area that is accessible from both sides for printing. A handle and latch member integral to one of the end pieces facilitate positioning the cartridge properly in the associated printing apparatus and locking it in place during printing. The cores are removable from the casing tubes by releasable cap assemblies in the end piece at the handle end of the cartridge so that all of the components of the cartridge can be reused if desired. The ribbon is advanced by means of a gear motor coupled to the core in the take-up tube by way of a mechanical slip clutch so that the take-up core can be rotated at different speeds without overloading the motor. There is also provision for monitoring the position of the ribbon in the cartridge.