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Disclosed is a method for controlling the depth of the print
image of a dot-matrix-printer which has a ink ribbon cassette with an ink
English (United States)
This text was extracted from a PDF file.
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This is the abbreviated version, containing approximately
97% of the total text.
Page 1 of 3
A method to control the depth of the ink ribbon of a dot-impact printer
In a ribbon-cassette which has an ink tank to supply ink to the ink ribbon, a certain amount of ink moves from the ink tank to the ink ribbon through a gear which feeds the ribbon when the print carrier of the printer moves. Also, a certain amount of ink moves from the ink ribbon onto a sheet of paper (a form) when the printer prints.
In a short period, for example while the printer prints one page, the amount of consumed ink 'Ic' is proportional to the number of printed dot 'Nd', and the amount of supplied ink from the ink tank 'Ip' is proportional to the amount of the carrier movement 'Lc'. Figure 1 shows the flow chart of this disclosure. The printer microcode counts 'Nd' and 'Lc' and calculates 'Ic' and 'Ip' when the printer is printing on a sheet of paper. After the printer ejects the sheet, the printer microcode compares 'Ic' and 'Ip'. When 'Ic' is larger than 'Ip', the printer microcode moves carrier without printing, until 'Ip' reaches 'Ic'.
Page 2 of 3
Insertion of a form
Receive Transaction data
Count Total Print Dot
Print Image and Calculate length
of Carrier move
Compare the quantity of consumed ink and supplied ink
End of transaction
Move carrier to
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