EP0082336A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Selective density printing using dot matrix print heads in fixed spatial relation
Assignee: International Business Machines Corp
•
Filing: 1982-11-23
•
Granted: —
•
Expires: 2002-11-23
Abstract
Abstract The dot matrix printer comprises a plurality of print heads with each print head printing a portion of the line. In order to obtain quality print, alternate print head (54) are horizontally aligned with respect to one another so that the dots of one of the two alternate print heads prints dots between previously printed dots of the other of the alternate print heads. The heads would be controlled to print over two portions of the line whereby quality printed dot matrix characters would result.
Inventors
- 👤 Frank R. Humphreys
- 👤 Donald K. Rex
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 05:54
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/485; B41J2/505; B41J2/515
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
99 words
l. A method for varying the density within printed dot matrix characters by selectively overstriking the same print medium position with the same character or portion thereof positionally offset in at least one direction, characterized by the steps of: partitioning each recording medium print line extent into n zones and assigning n print heads to counterpart zones; positioning the n heads in vertical offset relation from each other; and selectively causing each head to imprint the medium within its zone for low density and to overstrike a designated position within another zone with a predetermined character for high density.
Claim 2
Dependent Claim
32 words
A method according to claim 1 whereby the positioning step further includes the step of maintaining a vertical offset among selected pairs of heads to be within one-half dot character overlap relation.
Claim 3
Dependent Claim
99 words
Wire matrix printer for printing a line of characters on a record medium, said printer having a plurality of print heads, each positioned to print a portion of the line and each including a plurality of wires which print dots separated by a given distance, characterized by: corresponding wires of one of the alternate print heads being horizontally aligned to print dots between printed dots of the other of the alternate print heads; and said printer including control means for selecting whether each print head is to print in either one or two portions of said line of characters.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.