Half Up Half Down Printshaft Having Variable Stiffness
Original Publication Date: 1987-Dec-01
Included in the Prior Art Database: 2005-Feb-02
A printshaft has its stiffness increased by a factor of three when it is positioned in the correction mode in comparison with when it is positioned in the print mode. This prevents misalignment of the correction box with the print box, which the correction box is to correct, since the force on the printshaft during correction is a factor of three times that during printing. During printing, a carrier 1 (Fig. 1) is moved by a cable along a printshaft, which has previously been a round printshaft 2 with a keyway 3. As the carrier 1 has been moved along the printshaft 2, a ribbon feed mechanism has been driven from a shaft 4 of a gear 5 rotating along a fixed rack 6, which is supported at each of its ends but not intermediate its ends.