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Half Up Half Down Printshaft Having Variable Stiffness

IP.com Disclosure Number: IPCOM000040692D
Original Publication Date: 1987-Dec-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Stafford, DW: AUTHOR

Abstract

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.

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Half Up Half Down Printshaft Having Variable Stiffness

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. The carrier 1 has a printhead 7 mounted on a pivot shaft 8 for printing when held against a platen 9 during printing by being spring loaded. During correction the printshaft 2 is rotated 90o counterclockwise. At this time, the ribbon is held against the platen 9 by a pressure bar force that increases the total force on the printshaft 2 to three times that when printing is occurring. As a result of the deflection of the printshaft 2, the shaft 4 and the gear 5 to the left in Fig. 1 and the deflection of the intermediate non-supported portion of the rack 6 to the right, there is counterclockwise rotation due to these deflections whereby there is a vertical deflection of the printhea...