Galaxy EX Squeegee Module.pdf - 第3页
SQUEEG EE MODULE OVERV IEW Ch apte r Issue 4, J un 18 Tech nical Ref erenc e Ma nual 10.3 Squeegee Dri p Tr a y NOTE If La te ral Squeegee s are fitt ed, the drip tray is tal ler in height; to accommodate th e ex tr a he…
SQUEEGEE MODULE
OVERVIEW
10.2 Technical Reference Manual Chapter Issue 4, Jun 18
The squeegee mechanism is driven backwards and forwards across the
screen by the print carriage.
The squeegee printhead mechanism incorporates two stepper motors to drive
the two squeegees independently down onto the screen when a print stroke is
required. During the rearward stroke, the front squeegee is in contact with the
screen performing a rear print stroke. During the forward stroke, the rear
squeegee is in contact with the screen performing a forward print stroke.
The pressure being applied during the print stroke is measured by a strain
gauge bridge (located in the spring beam assembly of the squeegee
mechanism) and if necessary, a correction to the pressure is made by the
software.
Figure 10-1 Squeegee Sensor Locations
Paste Deflectors Paste deflectors may be used to keep paste and low density print mediums in
front of the squeegees.
View on Rear of Squeegee Printhead Mechanism
Rear Squeegee Mount Front Squeegee Mount
Front Squeegee Home
Sensor
Rear Squeegee Home
Sensor
Spring Beam Assembly
(rear plate shown
transparent)
Strain Gauge Bridge
(inside spring beam
assembly)
Paste Deflector Securing Screws
Paste Deflectors
Squeegee
SQUEEGEE MODULE
OVERVIEW
Chapter Issue 4, Jun 18 Technical Reference Manual 10.3
Squeegee Drip
Tray
NOTE
If Lateral Squeegees are fitted, the drip tray is taller in height; to accommodate
the extra height the ‘tray’ width is reduced.
The squeegee drip tray mechanism secures to the underneath of the print
carriage. The drip tray pneumatic actuator extends the drip tray below the
squeegees to prevent print medium from dripping onto the screen during print
carriage initialisation or auto screen loading.
The squeegee drip tray mechanism is also used to accommodate the auto
screen loader mechanism, refer to the Adjustable Screen Mount (ASM)
Module chapter for more information.
The drip tray retracted sensor is used by software to check that the pneumatic
actuator has retracted the drip tray before lowering the squeegees.
Squeegee Drip Tray Overview
1 Squeegee Drip Tray Thumbscrew 5 Squeegee Drip Tray
2 Speed Control Valves (Rear View) 6 Drip Tray Guide Shaft
3 Drip Tray Retracted Sensor (Rear
View)
7 Squeegee Drip Tray Mechanism
4 Drip Tray Pneumatic Actuator (Rear
View)
SQUEEGEE MODULE
OVERVIEW
10.4 Technical Reference Manual Chapter Issue 4, Jun 18
Lateral Squeegee
Adjust Mechanism
An option for printing on 3D stencils is the Lateral Squeegee Adjust
Mechanism. When printing 3D stencils, slit-edge squeegee blades are used,
front and rear. The printing edge of each squeegee blade has slits cut into it
that correspond to the raised surfaces of the stencil. As the squeegee
traverses the image, the slits rise up over the leading edge (or fall into the
recesses) of the stencil’s surface features.
Figure 10-2 Slit Edged Squeegee (depicting mis-alignment)
With the squeegee blades fitted (not shown above) they can be adjusted in the
X direction using the front and rear lateral adjusters (micrometer scales).
Stencil Step
Slitted Squeegee Blade
Squeegee Placed Above the Stencil Step
Diagramatic Representation
Squeegee Mechanism (squeegees not shown)
Squeegee Mechanism
Squeegee Mount (Rear)
Squeegee Mount (Front)
Lateral Adjuster (Rear)
Lateral Adjuster (Front)
Front Drive Shaft