Browse Prior Art Database

Interlock for Preventing Ribbon Break

IP.com Disclosure Number: IPCOM000062519D
Original Publication Date: 1986-Dec-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Bush, HG: AUTHOR

Abstract

A resistive ribbon is prevented from being broken during installation through locking a printhead actuation gear when a load lever is left open, the ribbon is loaded with slack, or the thermal printhead is resting on a cam ramp rather than a dwell when in its home position. A ribbon 1 has a spring-loaded ribbon brake arm 2 engaging therewith. If the ribbon 1 is slack when installed, the spring-loaded ribbon brake arm 2 rotates clockwise about its pivot 3 to the dashed line position to cause teeth 4 of the ribbon brake arm 2 to engage teeth 5 on a head-actuation gear 6, which rotates a thermal printhead (not shown), to prevent the head-actuation gear 6 from rotating counterclockwise to rotate the printhead. If an operator tries to type with the teeth 4 and 5 engaging, an error signal and an error light code are received.

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 57% of the total text.

Page 1 of 2

Interlock for Preventing Ribbon Break

A resistive ribbon is prevented from being broken during installation through locking a printhead actuation gear when a load lever is left open, the ribbon is loaded with slack, or the thermal printhead is resting on a cam ramp rather than a dwell when in its home position. A ribbon 1 has a spring-loaded ribbon brake arm 2 engaging therewith. If the ribbon 1 is slack when installed, the spring-loaded ribbon brake arm 2 rotates clockwise about its pivot 3 to the dashed line position to cause teeth 4 of the ribbon brake arm 2 to engage teeth 5 on a head-actuation gear 6, which rotates a thermal printhead (not shown), to prevent the head- actuation gear 6 from rotating counterclockwise to rotate the printhead. If an operator tries to type with the teeth 4 and 5 engaging, an error signal and an error light code are received. It is necessary for the operator to remove the slack from the ribbon 1 before typing can continue. This prevents destruction of the ribbon 1 or the thermal printhead since the printhead will burn through the ribbon 1 to destroy the ribbon 1 and damage the printhead if the ribbon 1 contains slack. When a load lever 7 is rotated clockwise about its pivot 8 to its ribbon load position (phantom line position), the ribbon brake arm 2 is pivoted counterclockwise against the force of its spring by a finger 9 on the load lever 7, engaging a finger 10 on the ribbon brake arm 2. This results in teeth 11 on the ribbon b...