SiplaceX4_en - 第392页
1 - 26 S tudent Guide SIPLACE X 8 Collect&Place-Head 20 Edition 09/2005 26 8.2.8 Measuring Z- axis position for Com ponent Recognition by the Component Sensor Fig. 8.2 - 8 Nozzle length measu rement at reference run …
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Student Guide SIPLACE X
Edition 09/2005 8 Collect&Place-Head 20
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8.2.7 Determining the Vacuum and Threshold Values
Fig. 8.2 - 7 Measuring and calculating the vacuum values for a reference run
1. The vacuum is measured twice at the reference point: once with closed and once with open
state, at the top of the nozzle.
2. The value with closed valve depends not anymore on the ambient pressure it is controlled by
the pressure control valve. A influence to the vacuum values are the nozzle fit on the segment
and the quality f the nottle top and the surface of transport rail at height measurement position.
3. The value by open valve depends on the nozzle size and condition. The smaller the nozzle,
the greater the open valve value will be. A contaminated or blocked nozzle will also give a
higher valve.
4. The difference between the open and closed nozzles has been preset by the line computer as
an ideal case minimum value. This value is different for all nozzle types e.g. 120 mbar for 1004,
1014 nozzles. If these values are not achieved, the error message "vacuum difference open-
closed is too low" will appear.
5. The threshold for component acceptance is also set now. Assumed are following values of 660
mbar by open nozzle and 852 mbar by closed nozzle on the transport rail.
The calculation is as follows:
Vacuum distance = 852(closed) - 660(open)= 192 mbar (larger than the min. distance on
nozzle type parameter set.
Threshold (192 mbar x 0.2)+ 660 (open value) = 698,4 mbar
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Student Guide SIPLACE X
8 Collect&Place-Head 20 Edition 09/2005
26
8.2.8 Measuring Z- axis position for Component Recognition by the Component
Sensor
Fig. 8.2 - 8 Nozzle length measurement at reference run for component recognition
During the height reference run the Component Sensor measures the Z axes position for each
segment, for detetecting the presence/absence of components in the pick up and placement po-
sition. During placement the Component Sensor can also recognize dirty nozzles.
While the Z axis moves downwards, the nozzle interrupts the IR beam of the Component sensor.
The axis position is saved and later used for the calculation of the component height and compo-
nent presence. At the upwards movement of the Z axis the IR beam is no longer interrupted and
the axis position is saved again. So the component presence can be determind during placement
by the programmed component height (Siplace Pro) and the nozzle length which was calculated
during the height reference run by the Z- axis position counter.
Receiver
LD - Transmitter
Nozzle
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Component Sensor
LD LASER Diode
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Student Guide SIPLACE X
Edition 09/2005 8 Collect&Place-Head 20
27
8.2.9 Height reference run
With this function we check the correct fitting of the nozzle on the sleeve and that the correct
nozzle type like the programmed one are set to the sleeves.
The nozzle length is taken to calculate the pick up and placement height for the subsequent place-
ments. !
Fig. 8.2 - 9 Measuring the nozzle height
(1) Top of the fixed conveyor side
(2) First step with segment 1 to measure the nozzle length.
(3) Last step with segment 20 to measure the nozzle length.
The gantry moves the placement head to the fixed conveyor rail at height measurement position.
The star turns the segment for measuring into the pickup/placement position
– The value "Vacuum open" is measured for each segment.
The Z-axis moves the segment downwards
– When the component sensor beam is interrupted, the Z-axis position of the component sen-
sor is determined for component sensor tasks.
When the Z -axis touches the conveyor rail, the nozzle length is determined by the Z- position
down value for nozzle length measurement.
– The closed vacuum is then determined for the accordant nozzle
The Z-axis moves upwards:
When the component sensor beam is no longer interrupted, the Z-axis position for the component
sensor will be measured again.
PLEASE NOTE: The measured length in component sensor is used for component presence or
height measurement only.
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CO - Sensor
CO - Sensor
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e.g. Segment 11
CO-
Camera
e.g. Segment 1
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