Printer 600 Adjustable Screen Mount.pdf - 第6页
$'-867$ %/(6&5(( 102817 $60 0(&+$1 ,&$/'(7$ ,/ 12.6 Technical Reference Manual Chapter Issue 3 May 03 Right Hand Rail Assembly The right hand r ail assembly is att ached to the ch ase via a we…
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Chapter Issue 3 May 03 Technical Reference Manual 12.5
MECHANICAL DETAIL
Chase Casting The chase casting is a ‘C’ shaped one piece casting containing the components
of the screen change module. It is the interface between the screen change
module and the machine. The chase is mounted on the machine chassis via
four chase bearing sets.
Chase Bearing The chase bearing consists of two major components:
• Roller Counter Plate
• Roller Bearing Assembly
The roller counter plates are attached to the chase in four positions. The roller
counter plates and roller bearing assemblies provide a floating chase arrange-
ment, the roller bearing assemblies are attached to the machine chassis and to
the chase via the roller counter plates.
The level of the chase relative to the rising table can be adjusted by varying the
height of the adjuster, using an Allen key through the access hole in the locking
collar, details of how this is achieved is given in the Adjustments and Settings
Section later in this chapter.
Figure 12-2 Chase Bearing
Sectional View ‘B - B’
(Through Chassis)
Locking Collar
Adjuster
Roller Counter Plate
Roller Bearing Assembly
Machine Chassis
Plan View of Chase
A
View on Arrow A
B
B
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12.6 Technical Reference Manual Chapter Issue 3 May 03
Right Hand Rail
Assembly
The right hand rail assembly is attached to the chase via a web assembly at
either end of the rail. The web assemblies clamp the rail to the front and rear
linear ball bush shafts securing the rail in the required position within the chase.
Figure 12-3 Right Hand Chase Rail Assembly
Attached to the inner face of the rail assembly are three location leaf springs
interspersed with segments of the nylon stencil guide strip. The springs provide
positive location for the stencil against the left hand rail assembly. Providing
support to a loaded stencil is the stainless steel stencil support plate attached
to the underside of the rail assembly.
A double acting pneumatic cylinder fitted to the external face of the rail assem-
bly is operated by the user via the Change Screen function button. Pneumatic
pressure is applied to the cylinder causing the cylinder piston to retract.
Attached to the end of the cylinder piston is a pulley. A fixed length cable
assembly is threaded from it’s retaining bracket around the piston pulley to a
pulley situated at the front end of the rail assembly. The cable runs from the front
of the rail to the cable retainer bracket at the rear of the rail assembly. The cable
assembly is routed around three pulleys associated with each of the four flap
assemblies. The two lower pulleys are fixed and the top pulley is attached to the
free end of the flap.
Stencil Guide Strips
(in 5 positions)
Stencil Location Leaf Springs
(in 3 positions)
Flap Assembly
(in 4 positions)
Stencil Support Plate
Screen at Centre
Opto Transmitter
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Chapter Issue 3 May 03 Technical Reference Manual 12.7
Figure 12-4 Rail Assembly - Cable Routing
As the pneumatic cylinder piston is retracted the cable assembly is effectively
shortened causing the top pulley and hence the flap to be pulled down towards
the stencil support plate against spring pressure. The screen is now clamped
between the flaps and the stencil support plate.
To release the screen, pneumatic pressure is applied to the cylinder extending
the piston and lengthening the cable assembly. This allows the flaps to return
to the horizontal plane under spring pressure, releasing the screen. The routing
of the cable assembly within the rail assembly is shown in the diagram above.
The Screen at Centre opto transmitter is fitted to the right hand chase rail
assembly.
Flap Assembly
Pulley
(in 3 positions)
Pneumatic Cylinder
Cable Assembly
View on Underside of Rail Assembly
(Stencil Support and Guides Removed for Clarity)