Browse Prior Art Database

Sensor Adjusting

IP.com Disclosure Number: IPCOM000088201D
Original Publication Date: 1977-May-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 54K

Publishing Venue

IBM

Related People

Waddell, JM: AUTHOR

Abstract

In some data processing apparatus, such as a printer, the carriage containing a print-causing element, such as mechanical fonts, ink jets, electrical electrodes, and the like, is transported back and forth on a travel path in a carriage under control of a programmable servo computer. The extent of the travel is determined by left and right stops. Such stops can be coincident with the edge of a web being printed. In the alternative, control points can replace the left and right stops for turning the print elements of the carriage on and off. For the programmable servo computer to control the carriage properly, it has to know exactly where the stops/web edges are. Optical sensors are positioned adjacent the stop/edges.

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 100% of the total text.

Page 1 of 2

Sensor Adjusting

In some data processing apparatus, such as a printer, the carriage containing a print-causing element, such as mechanical fonts, ink jets, electrical electrodes, and the like, is transported back and forth on a travel path in a carriage under control of a programmable servo computer. The extent of the travel is determined by left and right stops. Such stops can be coincident with the edge of a web being printed. In the alternative, control points can replace the left and right stops for turning the print elements of the carriage on and off. For the programmable servo computer to control the carriage properly, it has to know exactly where the stops/web edges are. Optical sensors are positioned adjacent the stop/edges.

A microprocessor routine shown in the flow chart of the drawing assists installers and maintenance personnel in adjusting the sensors under program control for precisely locating the control points. In the flow chart the term "home" is a position wherein the carriage is abutting one of the stops. The term "tachs" refers to tachometer signals from the carriage for indicating position on the travel path away from the respective stops. The lights A, B and C are indicating lights (not shown), indicating that the adjustment is correct to the left or to the right of the carriage at the control point.

1

Page 2 of 2

2

[This page contains 4 pictures or other non-text objects]