Browse Prior Art Database

# A method to control the depth of the ink ribbon of a dot-impact printer

IP.com Disclosure Number: IPCOM000011855D
Original Publication Date: 2003-Mar-20
Included in the Prior Art Database: 2003-Mar-20
Document File: 3 page(s) / 10K

IBM

## Abstract

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 tank.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
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'.

1

Page 2 of 3

Insertion of a form

Eject?

Create Print

Image

Count Total Print Dot

Print Image and Calculate length

of Carrier move

N

N

Y

Eject form

Calculate and

Compare the quantity of consumed ink  and supplied ink

Y

Ink Shortage?

End of transaction

N

Move carrier to

supply ink

2