Apparatus and method for calibrating printing at a specified distance from a document edge
US4960336A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 26, 1990 |
| Grant date | Oct 2, 1990 |
| Priority date | — |
| Expiry date | Jan 26, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J11/46
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method for calibrating a printer to print data beginning at a specified distance from the reference edge of a document. Several test documents are moved through a print station and a test symbol is printed on each of them with a preselected set of heating elements from a dot matrix thermal printer. The test documents are then processed through the same print station whereupon a sensor detects the reference edge of the document and the test symbol. A master controller then determines a test symbol distance between the reference edge and the midpoint of the test symbol for each test document. A plurality of test documents is processed in this manner, and the master controller determines an average test symbol distance for the plurality of test documents. Using an average test symbol distance, the master controller determines the distance between the sensor and a given hewating element of the thermal printer. The master controller than calculates a calibration distance which is based on a comparison of actual distance between the reference edge and the preselected heating elements versus average test symbol distance. In order to calibrate the printer to account for the calibration d…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.