Table of Contents
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Sub-Section
1
2
1.
INTRODUCTION
1.1
The ZX Printer is designed for use with the S i n c l a i r range of micro-
computers, and provides a permanent record of any computer output
which may be displayed on the TV screen.
always ' j o i n u p ' , l o n g programs, tables of results, elaborate patterns
and graphs can be printed out as continuous records, even if carried
out in several parts.
2.
PRINCIPLE OF OPERATION
2.1
The printing mechanism is unconventional, and consists of two styli
which pass successively across the surface of the paper.
represents one row of dots, and six rows of dots form the matrix for a
single line of print. A moderately high voltage (50V) is generated in
the electronics within the printer, and is routed to a conductor strip
in the top cover.
2.2
Each stylus is hairpin-shaped so that one end passes over the surface
of the paper whilst the other end contacts the conductor strip, thus
carrying the current to the natal l i e coating of the paper.
path is through the coating to the conductive rubber roller, which
also feeds the paper through the printer, to the earth connections
within the electronic circuitry.
paper, the stylus passes over an 'L'-shaped insulating wafer; as the
stylus leaves the wafer,
continuity is sensed by the control electronics which then pulses the
applied voltage to provide the printing action.
2.3
A description of the control circuit is given in Section 2.
SECTION 1
GENERAL INFORMATION
LIST OF CONTENTS
Introduction
Principle of Operation
it touches the paper and the electrical
1.1
Because of graphic d i s p l a y s
Before making contact with the
Page No.
1.1
1.1
Each pass
The return
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