Browse Prior Art Database

Microcontrolled Ribbon Motion And Splice Detection System

IP.com Disclosure Number: IPCOM000048722D
Original Publication Date: 1982-Mar-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Cavill, BR: AUTHOR [+3]

Abstract

When using continuous-loop ribbon in a slant head matrix printer, printing must not occur on the splice connecting the two ends of the ribbon because the actuators hitting the splice cause premature ribbon failure. This article describes a ribbon system in which a hole provided in the ribbon adjacent to the splice can be used with a simple detector to determine not only whether a splice has been detected, but also when a ribbon jam has occurred.

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Microcontrolled Ribbon Motion And Splice Detection System

When using continuous-loop ribbon in a slant head matrix printer, printing must not occur on the splice connecting the two ends of the ribbon because the actuators hitting the splice cause premature ribbon failure. This article describes a ribbon system in which a hole provided in the ribbon adjacent to the splice can be used with a simple detector to determine not only whether a splice has been detected, but also when a ribbon jam has occurred.

The detection system for detecting a ribbon splice and a ribbon error condition Is comprised of a mechanical roller 11, a magnet 12, a magnetic Hall effect sensor 13, and a microcomputer 14. As an alternate to a magnetic sensor, optical sensing means can be employed.

The roller 11 is driven by the motion of the ribbon, with movement detected by the changing magnetic field detected by the Hall effect sensor 13. While motion cf the ribbon occurs, the system will produce a continuous, although varying, pulse train. These pulses are monitored by the microcomputer 14, and as long as they occur at a sufficiently frequent interval, ribbon motion is verified.

The microcomputer samples the pulses, and if they do not occur for a certain minimum time, the microcomputer times the absence of pulses. If the pulses again occur before a maximum time, the hole in the ribbon is detected and printing is delayed until the splice clears the print area. The ribbon hole width is chosen t...