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Browse Prior Art Database

Variable Lift and Feed Increment Ribbon/Correction Mechanism

IP.com Disclosure Number: IPCOM000046862D
Original Publication Date: 1983-Aug-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 3 page(s) / 69K

Publishing Venue

IBM

Related People

Greenlief, GL: AUTHOR [+4]

Abstract

A simple mechanism for providing both feed and lift to the printing ribbon using a single stepping motor while at the same time providing feed and lift for the correction ribbon is described and illustrated. The elimination of duplicate parts is desirable as in cost savings and reliability consideration in the building of ribbon feed mechanisms while at the same time getting the desired ribbon feed characteristics. Lift arms 10 are pivotally mounted on the carrier and act to elevate the ribbon lift arms of a cartridge. The cartridge may be pivoted, have movable lift arms or, by modifying the ends of the lift arms of the ribbon feed mechanism, may lift the ribbon itself and leave the cartridge in a fixed position.

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Variable Lift and Feed Increment Ribbon/Correction Mechanism

A simple mechanism for providing both feed and lift to the printing ribbon using a single stepping motor while at the same time providing feed and lift for the correction ribbon is described and illustrated. The elimination of duplicate parts is desirable as in cost savings and reliability consideration in the building of ribbon feed mechanisms while at the same time getting the desired ribbon feed characteristics. Lift arms 10 are pivotally mounted on the carrier and act to elevate the ribbon lift arms of a cartridge. The cartridge may be pivoted, have movable lift arms or, by modifying the ends of the lift arms of the ribbon feed mechanism, may lift the ribbon itself and leave the cartridge in a fixed position. The lifting of the lift arms 10 is a result of the interaction between follower 12, attached to the lift arms 10, and thimble cam 14. The thimble cam 14 is mounted on a shaft 16 which connects with a stepper motor 18 to rotate the thimble cam
14. By rotation of the thimble cam 14, follower 12 will be raised and thus effect the raising of the ribbon. The thimble cam 14 can then be reversed to lower the ribbon by reversing the stepper motor 18. Precise control of the extent of elevation and lowering of the ribbon lift guides 10 can be accomplished by controlling the steps of stepper motor rotation. On the exterior of the thimble cam 14 are two sets of intermittent gear teeth 20 and 22. Gear teeth 22 have a short length in comparison with the gear teeth 20. Positioned adjacent the periphery of the thimble cam 14 are two clutch and gear mechanisms 24 and 26. Gear 24 is positioned vertically such as to engage only gear teeth 22 on the periphery of thimble cam 14. Gear 26 is positioned vertically such that it may be engaged by both sets of gear teeth 20 and 22. Thus, as the thimble cam 14 is rotated clockwise, gear 26 will engage teeth 20 and 22 and rotate in an idling direction with respect to the clutch drive associated therewith. As cam 14 then rotates in a counterclockwise direction to lower the ribbon lift guide arms, the clutch 28 will engage such that shaft 30 will rotate in response to the gear engagement between teeth 20 or 22 and driven gear 26. As thimble cam 14 rotates, the gear 24 will engage with teeth 20 but w...