Cartridge-type ink supply device for labeling machines

In an ink supply device for supplying ink onto a type surface of a printing mechanism of a labeling machine, said printing mechanism being used for printing inscriptions on each of a series of labels fed by indexed movement along a travel path thereof within the machine, said ink supply device comprising an ink roller cartridge holder provided at one end thereof with a part adapted for supporting and attaching detachably the ink supply device onto the labeling machine and at the other end with a U-shaped inking roller support adapted for detachably engagement with an inking roller cartridge having therein at least one inking roller:

• an improvement wherein said cartridge holder comprises a traverse pin fixedly supported adjacent said printing mechanism parallel to the axis thereof and between the opposed side walls of the labeling machine frame, a fingerhold tab formed at one end thereof and at least a pair of gripping jaws adjacent said fingerhold tab which are integrally made of plastic material for relatively loose gripping or clamping engagement with said transverse pin;
• and spring means adapted for urging said jaw part against said traverse pin;
• said cartridge holder being easily and securely mountable on and easily dismountable from said traverse pin as said gripping jaws are manipulated into and out of gripping engagement with said traverse pin by grasping said fingerhold tab.