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CARRIAGE DISPLACEMENT ARRANGEMENT FOR PRINTWHEEL REPLACEMENT IN IMPACT PRINTER

IP.com Disclosure Number: IPCOM000024973D
Original Publication Date: 1983-Feb-28
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 106K

Publishing Venue

Xerox Disclosure Journal

Abstract

Printwheel replacement in impact printers is important since many present day printer operations require the use of multiple fonts. In conventional daisywheel-type impact printers, a reciprocating carriage, which moves parallel to the printer platen, carries the printwheel, printwheel drive motor, hammer assembly, ribbon cartridge, and ribbon advance mechanism. Since the carriage is usually driven by a cable or timing belt arrangement, its position (other than transverse movement) is fixed. Therefore, in order to move the printwheel, the printwheel motor and the hammer assembly out of the way during removal or replacement of the printwheel, a tiltable subcarriage is usually provided upon the traversing carriage. This requires a complex and relatively expensive construction.

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"OX DISCLOSURE JOURNAL

I

CARRIAGE DISPLACEMENT ARRANGE- Proposed Classification VENT FOR PRINTWHEEL REPLACEMENT
IN IMPACT PRINTER
Henry E. Smith

US. Cl. 400/354.3 Int. CI. B41j 11/22

I, 111 \

'14

FIG. 1

I4

FIG 2

Volume 8 Number 1 January/February 1983 67

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CARRIAGE DISPLACEMENT ARRANGEMENT FOR PRINTWHEEL REPLACE- MENT IN IMPACT PRINTER (Cont'd)

Printwheel replacement in impact printers is important since many present day printer operations require the use of multiple fonts. In conventional daisywheel- type impact printers, a reciprocating carriage, which moves parallel to the printer platen, carries the printwheel, printwheel drive motor, hammer assembly, ribbon cartridge, and ribbon advance mechanism. Since the carriage is usually driven by a cable or timing belt arrangement, its position (other than transverse movement) is fixed. Therefore, in order to move the printwheel, the printwheel motor and the hammer assembly out of the way during removal or replacement of the printwheel, a tiltable subcarriage is usually provided upon the traversing carriage. This requires a complex and relatively expensive construction.

In the present arrangement, as illustrated, the entire traversing carriage 10, supporting printwheel 12 and printwheel motor 14, is tiltable from an upper, operational position to a lower, printwheel removal position. The printwheel is shown at a location beneath the platen 16, spaced therefrom by a distance D in its upper position and by a distance D in its lower position. The distance 0 is sufficient for ready removal of the printwheel. As carriage 10 traverses in a plane parallel to the axis of the platen 16, it rides upon carriage drive shaft 18 and...