RO92507B1

RO92507B1 - Roller for producing characters for a printing machine and process for manufacturing the same

Info

Publication number: RO92507B1
Application number: RO118502A
Authority: RO
Inventors: Liviu Livescu
Original assignee: îNTREPRINDEREA DE SCULE SI ELEMENTE HIDRAULICE
Priority date: 1985-04-23
Filing date: 1985-04-23
Publication date: 1987-10-31
Also published as: RO92507A2

Abstract

Inventia se refera la un cilindru si un procedeu de prelucrare a caracterelor cilindrului pentru imprimantele calculatoarelor electronice. Cilindrul pentru obtinerea caracterelor pentru imprimanta cuprinde un ax principal ce sustine la capete niste rulmenti care primesc la exterior câte o bucse care, împreuna cu axul, primesc si delimiteaza un cilindru metalic cauciucat, peste care se îmbraca un cilindru propriu-zis pe suprafata caruia se realizeaza prin electrocoroziune caracterele de imprimare. Procedeul consta din faptul ca cilindrul propriu-zis se executa din otel aliat de cementare caruia i se aplica un tratament de cementare pe un strat de 1..1,2 mm adancime dupa care se face o calire plus revenire obtinându-se o duritate de 58..59 HRC, urmata de o normalizare la 120..140grade C, în mediul de ulei, timp de 48 h dupa care în faza urmatoare se executa electrocoroziunea, obtinând caractere cu sectiunea normala cu profil trapezoidal avand baza mica, fateta de contact egala cu 0,25 mm, iar fiecare din flancurile profilului înclinate la un unghi de 20 grade cu înaltimea cuprinsa între 0,3 si 0,35 mm.The invention relates to a cylinder and a process for processing the cylinder characters for electronic computer printers. The cylinder for obtaining characters for the printer comprises a main shaft which supports at the ends some bearings which receive on the outside a bush which, together with the shaft, receive and delimit a rubberized metal cylinder over which a proper cylinder is placed on the surface of which performs the print characters by electrocorosion. The process consists in the fact that the cylinder itself is made of cemented alloy steel which is applied to a cementitious treatment on a layer of 1 ... 1,2 mm depth, after which a hardening and rewinding is achieved, obtaining a hardness of 58..59 HRC, followed by a normalization at 120..140grade C in the oil environment for 48 hours, after which the electrocorosion is performed in the next stage, obtaining characters with the normal section with a trapezoidal profile having a small base, the contact face equal to 0.25 mm, and each of the profile flanks inclined at an angle of 20 degrees with a height of between 0.3 and 0.35 mm.