AL1_SiplaceX-en.pdf - 第193页

1 - 31 S tudent Guide SIPLACE X Edition 02/2005 5 Collect&Place-Head 20 31 Fig. 5.3 - 3 PCB position recogniti on run to the PCB nominal position – PCB position recognitio n is performed before the first componen t i…

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Student Guide SIPLACE X
5 Collect&Place-Head 20 Edition 02/2005
30
5.3.2 20 Nozzle Collect & Place Head in Home Position 0
°
Fig. 5.3 - 2 20 nozzle collect & place head in home position 0°
5.3.3 PCB position recognition and temperature compensation
The PCB recognition is necessary to determined the correct position of the PCB in the machine
(Transport --> Placement area).
It should be two fiducials on each PCB minimum. With this two fiducial we are able to determined
the X/Y position and the angle of the PCB in the transport. The fiducials shouldn‘t be in one line
on the PCB.
Up to 3 fiducials can program for the PCB recognition. With the third fiducial, we determined ad-
ditional to the position of the PCB the geometric data of the PCB layout, that means is the PCB
stretch.
The Siplace X machine increase the accuracy, so that we make additional to the PCB recognition
a temperature compensation with the second gantry in the placement area.
the
Star
axis
is
turned
to
home
position
Placement position
CO-
Camera position
1
2
3
4
5
6
7
8
9
10
12
11
13
14
15
16
17
18
19
20
Segment 1
Segment 11
S
t
a
r
p
o
s
i
t
i
o
n
CO- Camera
Star position
Digit: 10
Angle: 0°
1° is equivalent to 1000 digits
The Z-axis retract unit prevents seg-
ment 1 from falling.
TSP
30
1
Gantry 1
Gantry 3
Gantry 4
Siplace X 3
TSP
30
1
Gantry 1
Gantry 3
Gantry 4
Transport
direction
Siplace X 4
Gantry 2
TSP
30
1
Gantry 1
Gantry 2
Siplace X 2
Transport
direction
Transport
direction
Gantry 1 and 2 PCB recog-
nition with max. 3 fiducials
Gantry 4 PCB recognition with
max. 3 fiducials Gantry 3 with
2 fiducials
Gantry 1 temperature compensa-
tion with 2 fiducials.
Gantryl 4 PCB recognition with
max. 3 fiducials Gantry 2 with
2 fiducials
Gantry 1 and 3 temperature com-
pensation with 2 fiducials.
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Student Guide SIPLACE X
Edition 02/2005 5 Collect&Place-Head 20
31
Fig. 5.3 - 3 PCB position recognition run to the PCB nominal position
– PCB position recognition is performed before the first component is picked up.
– The gantry axes move the PCB camera to the theoretical fiducial position. The camera takes
the picture of the first fiducial and the vision system calculates the center position.
5.3.4 PCB Position Recognition - Centering of the PCB Fiducials
Fig. 5.3 - 4 PCB position recognition - centering of the PCB fiducials
– The camera takes the picture of the second fiducial and the vision system calculates the center
position of this picture.
– With both fiducial positions is the board position and board angle calculated.
– All board fiducials are optically centered with this procedure.
– This data is sent to the machine controller
– The correction values are calculated for the X, Y and the angular position of the PCB and the
board internal dilation.
– Now the gantry axes move the placement head to the first pick up position.
PLEASE NOTE: If synthetic fiducials are used, this does not change the described sequence,
although inkspot recognition will now be performed after fiducial recognition. 5
The fiducial is expected at this nominal position. The PCB cam-
era is moved from waiting position to this fiducial position.
The centered fiducial now defines the actual posi-
tion of the board.
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Student Guide SIPLACE X
5 Collect&Place-Head 20 Edition 02/2005
32
5.3.5 Turning Nozzles 1 to 20 to the Pickup Angle (0° or 90°)
Fig. 5.3 - 5 Turning segments 1 to 20 to the pickup angle (0° or 90°)
5.3.6 Check Nozzle Length for Component Recognition
Fig. 5.3 - 6 Check nozzle length "component recognition by the component sensor, before pick up"
1
2
3
4
5
6
7
8
9
10
12
11
13
14
15
16
17
18
19
20
Segment 1
Segment 11
S
t
a
r
p
o
s
i
t
i
o
n
CO-Camera
– The segments in the collect & place 20
head are turned
in succession, begin-
ning with segment 1, to the required
pickup angle of 0° or 90°.
– Note: each segment has its own DP drive
1
2
3
4
5
6
7
8
9
10
12
11
13
14
15
16
17
18
19
20
CO- Sensor
CO- Sensor
Segment 1
Segment 11
S
t
a
r
p
o
s
i
t
i
o
n
CO- Camera
Component sensor measures at star
pickup position:
– Vacuum measurement: ’Segment open’
value
–the
component sensor measures the
nozzle length. The measured length be-
fore pickup is verified with the reference
length.
– If a length difference of -0.15mm or +
0.1mm is detected, the gantry axes
move the placement head into the ser-
vice position so that the nozzle can be
replaced.
– Measurement is performed during Z-
movement in the star pickup/placement
position.