Product Structure; Mechanism And Electromechanical Devices - CPG Compuprint SP 40 Maintenance Manual

Maintenance Manual
1.5

Product Structure

1.5.1 Mechanism and Electromechanical Devices

The basic mechanism has been designed to support a flat-bed path oriented to an high reliability of the paper
handling.
Paper Handling
A stepper motor, supporting 1/180" paper step together with a minipitch belt, provides the movement to the paper
alignment and pressing front and rear rollers.
Rollers opening and Aligner selection
A stepper motor drives a guide installed in the left side of the printer that allows to open/close the paper pressing
rollers and to activate the Aligner mechanism (special rollers + stop bar) to provide the Auto Document Alignment or
Skew Adjustment feature.
Carriage Movement
A stepper motor provides the movement of a carriage, carrying the print head, which is driven by a stepper motor and
a minipitch belt.
Ribbon movement
The motion of the ribbon is driven by mechanical coupling and plastic gears assy that translate the bidirectional
movenent of the carriage to one way movement for the the pivot driving the ribbon. The ribbon drive assy is installed on
the left side of the vertical frame, near the pulley of the carriage motor.
Gap Distance
A special wheel installed on the body of the print head and a flexiible platen realize together the function of Automatic
Adjustment of the printhead gap according to the paper thickness in real time. The AGA wheel forcing continuosly on
the platen with a force depending from the thickness of the media interposed between them.
Sensors
There are 5 sensors in this printer for the following features:
Cut Sheet Loading
Cut Sheet Skewing
Paper Edge Detection
Home Position Detection
Ribbon Present and Movement (on the mechanical assy)
See chapter 7 for the electrical schematics.
Printhead
The printhead to be used is the ER24W with the following characteristics:
Printhead type:
Number of wires:
Needle diameter:
Configuration:
Technology:
Max. frequency
Energy per dot
Life
Copies
Dimensions
See chapter 7 for the electrical schematics.
Rev. 005
(on the sensor board)
(on the sensor board)
(on the print head assy)
(on the mechanical assy)
ER24W
24
0.25 mm
diamond
Electromagnetic not Ballistic
2400 Hz (Text Mode)
2100 Hz (Graphic Mode)
5 mJ
400 Million chars @ Draft 10 cpi
1 + 5
Length (53 mm), Diameter (62 mm), Weight (300 g)
6
SP 40
Chapter 1
General