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Radial Displacement of a Two-Row Daisy Printwheel

IP.com Disclosure Number: IPCOM000043389D
Original Publication Date: 1984-Aug-01
Included in the Prior Art Database: 2005-Feb-04
Document File: 2 page(s) / 52K

Publishing Venue

IBM

Related People

Albrecht, JM: AUTHOR

Abstract

The selection of printing with characters arranged on the inner or outer ring of a daisy printwheel, which comprises two concentric character rows, is done by radially shifting the petals carrying the characters. Each individual petal is flexible and bent into a radially outward direction by a co-rotating channel plate which contains a channel for each petal and allows radial movement of the petal but no concentric movement. The petals are centrally kept together by a hub which is displaced along the rotation axis of the printwheel for splaying the petals, bending them and displacing them radially. Fig. 1 shows a daisy printwheel 1 contained and rotatably assembled in a cartridge 2. Printwheel 1 comprises petals 3 which carry on their outer ends an inner row 4 and an outer row 5 of characters.

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Radial Displacement of a Two-Row Daisy Printwheel

The selection of printing with characters arranged on the inner or outer ring of a daisy printwheel, which comprises two concentric character rows, is done by radially shifting the petals carrying the characters. Each individual petal is flexible and bent into a radially outward direction by a co-rotating channel plate which contains a channel for each petal and allows radial movement of the petal but no concentric movement. The petals are centrally kept together by a hub which is displaced along the rotation axis of the printwheel for splaying the petals, bending them and displacing them radially. Fig. 1 shows a daisy printwheel 1 contained and rotatably assembled in a cartridge 2. Printwheel 1 comprises petals 3 which carry on their outer ends an inner row 4 and an outer row 5 of characters. Centrally the petals 3 are connected to a hub 6 which is interconnected to an interlock 7 that couples printwheel 1 to a selection motor (not shown) which performs character selection within a row 4 or 5 by rotating printwheel 1 around axis 8. Printing is performed by hammer 9 on the position of the outer row 5, as shown in solid lines. Petals 3 rest glidingly against a channel plate 10 which co-rotates and bears on a block 11 of cartridge 2 via a bearing 12, both provided on rotation axis 8. Between hub 6 of printwheel 1 and channel plate 10 a compression spring 13 is provided and guided centrally by retainers 14 attached on one side to hub 6 and on the other side to channel plate 10. Compression spring 13 tries to expand and therefore pushes apart hub 6 and channel plate 10 which are kept in place by cartridge 2. Hub 6 and character rows 4, 5 are arranged in different planes such that these planes are esse...