EP0507328A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Printing method for serial printer and serial printer

Assignee: Seiko Epson Corp

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Filing: 1992-04-03

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Granted: —

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Expires: 2012-04-03

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Abstract

Abstract A printing method for a serial printer in which data are printed with a print head having a plurality of print elements arranged in a sheet forwarding direction at a predetermined interval while moving the head in a head feeding direction perpendicular to the sheet forwarding direction. The method includes the steps of a) setting a printing density so that a first portion of the print head prints with a high density and a second portion of the print head permits with a low density; b) moving the print head in the head feeding direction to print a first pass with a first high density portion and a first low density portion on the paper; c) forwarding the paper in the sheet forwarding direction so that a portion of the print head overlaps the first low density printed portion; d) setting the printing density such that the overlapping portion of the print head prints with the low density and a nonoverlapping portion prints with the high density; and e) moving the print head in the head feeding direction to print a second low density portion overlapping the first low density portion and a second high density portion adjacent thereto opposite the first high density portion.

Inventors

👤 Seiichi Hirano
👤 Keiichi Ohshima

Bibliographic Details

Application Number —

Jurisdiction EP

Data Source google_patents

Last Synchronized 2026-11-09 11:53

CPC Classifications

B; B41; B41J; B41J2/00; B41J2/485; B41J2/505; B41J2/5056; G; G06; G06K; G06K15/00; G06K15/02; G06K15/10; H; H04; H04N; H04N1/00; H04N1/04; H04N1/12; H04N1/126; H04N1/128; H04N1/19; H04N1/191; H04N1/1911; G06K2215/00; G06K2215/111; H04N2201/00; H04N2201/04; H04N2201/0402; H04N2201/0414

Claims Analysis

Total Claims: 6

Claim 1

Independent Claim 150 words

A printing method for a serial printer in which data are printed with a print head having plurality of print elements arranged in a sheet forwarding direction at a predetermined interval while moving said head in a head moving direction perpendicular to said sheet forwarding direction, said printing method comprising the step of: reducing the recording density in said head moving direction by half a recording density in a nonoverlapping row every pass, so that, when print data whose height is greater than a maximum height printable with a single pass without forwarding said sheet, a part of said print data to be recorded in a next pass can be recorded so as to overlap a previous pass by one or more dot rows and so that, in said overlapping dot row or rows, dots of said previous pass and dots of said next pass are arranged in staggered manner.

Claim 2

Dependent Claim 166 words

A serial printer, comprising: data judgment means (30) for detecting selection of an image data print mode; sheet forwarding distance output means (31) for forwarding a sheet by, H-N dots obtained by subtracting at least N dot(s), N being an integer equal to and greater than 1, from a maximum print height consisting of H dots; sampling means (33) for extracting all data belonging to an area from a first dot row to an H-Nth dot row and one of even digits and odd digits of data belonging to an area from an H-N+lth dot row and onwards in a first print pass, and extracting all data belonging to an area from an N+lth dot row and onwards and the other of said even digits and odd digits of data belonging to an area from a first dot row to an Nth dot row in a second print pass; and means (26) for driving a recording head (106) based on data from said sampling means (33).

Claim 3

Dependent Claim 205 words

A printing method for a serial printer in which data are printed with a print head having a plurality of print elements arranged in a sheet forwarding direction at a predetermined interval while moving said head in a head feeding direction perpendicular to said sheet forwarding direction, said method comprising the following steps: a) setting a printing density so that a first portion of said print head prints with a high density and a second portion of said print head prints with a low density; b) moving said print head in said head feeding direction to print a first pass with a first high density portion and a first low density portion on said paper; c) forwarding said paper in said sheet forwarding direction so that a portion of said print head overlaps said first low density printed portion; d) setting said printing density such that said overlapping portion of said print head prints with said low density and a nonoverlapping portion prints with said high density; and e) moving said print head in said head feeding direction to print a second low density portion overlapping said first low density portion and a second high density portion adjacent thereto opposite said first high density portion.

Claim 4

Dependent Claim 53 words

The method of claim 3, wherein said step of setting the printing density so that said second portion of said printing head prints with a low density comprises setting said printing head so that only one of even and odd data points are printed as said head moves in said head feeding direction.

Claim 5

Dependent Claim 53 words

The method of claim 4, wherein said step of resetting the printing density of said head so that said overlapping portion prints with said low density comprises resetting said print head so that only the other of even and odd data points are printed as said head moves in said head feeding direction.

Claim 6

Independent Claim 27 words

The method of one of claims 3 to 5, wherein said forwarding step comprises forwarding said paper such that said overlapping portion corresponds to one dot line.

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