Vista Rail System Module.pdf - 第6页
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Chapter Issue 1 Sep 02 Technical Reference Manual 12.5
Foil-less Clamps This option is used on thin boards which are populated with components too
close to the edge of the board for traditional board clamps. The board is
secured during the print stroke by the use of vacuum. The clamps are
perpendicular to the board maintaining a good gasket between the board and
the stencil. The clamps are adjusted in height for different thicknesses of board
by two grub screws.
Figure 12-3 Side View of Foil-less Clamp Operation
Adjustment Grub Screw
Rail
Foil-less Clamp
Board
Vacuum Box
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12.6 Technical Reference Manual Chapter Issue 1 Sep 02
DRIVES AND SENSORS
Sensors
Motors
NOTE
Location of rail system sensors and drives are detailed on the Rail System
Overview Figure at the beginning of this chapter.
Name Type Test Point Functional Description
Rail Lifted Left Through Beam
Opto
NextMove Dig IN 3 Detects premature lifting of
rail
Rail Lifted Right Through Beam
Opto
NextMove Dig IN 4 Detects premature lifting of
rail
Moving Rail Home Through Beam
Opto
Stepper Multiplexer
MUX2
Provides home position of
moving rail thus providing
accurate board width settings
Board at Left Diffuse Opto NextMove Dig IN 16 Detects left side incoming/
outgoing board dependent
upon machine pass through
configuration
Board at Right Diffuse Opto NextMove Dig IN 17 Detects right side incoming/
outgoing board dependent
upon machine pass through
configuration
Name Type Functional Description
Moving Rail Drive Stepper Motor Moves the rear moving rail in the Y direction
Front Board
Transport Belt
Drive
DC Moving Coil
Motor
Turns the front transport belt in the clockwise or anti
clockwise direction (dependent upon upline/downline
feed direction)
Rear Board
Transport Belt
Drive
DC Moving Coil
Motor
Turns the rear transport belt in the clockwise or anti
clockwise direction (dependent upon upline/downline
feed direction)
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Chapter Issue 1 Sep 02 Technical Reference Manual 12.7
Rail Lifted Sensors The left and right rail lifted sensors are through beam opto type sensors.
These sensors are fitted to the bottom of the left and right moving rail support
arms. The sensor vanes are fitted to the entire length of the rail stop bars.
These sensors feed directly into NextMove card of the machine PC.
The purpose of the rail lifted sensors is to detect premature lifting of the rail as
the rising table rises. This may occur if tooling or any other object was placed
under the rear rail. They are checked:
1. Immediately after the rail has moved to its new board width following product
file change.
2. When Run is pressed, before the camera moves to board stop position.
3. After printing to check that the rail is fully down before the next print cycle
can commence.
4. When the table moves to rail lift check height before moving to vision height.
Figure 12-4 Rail Lift Setting
Right Rail
Support Bracket
Main Rear
Rail
Front View of Rail System
Left Rail
Support Bracket
Feeler Gauge -
0.5mm
Rail Stop Bar
Opto Vane
Bracket
Opto
Shock Absorber
Light Extinguishes
when Sensor lifted
0.5mm
Linear Rail
Enlarged View of Right Rail Opto