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Part 1 1 – 46 FCP IV -3 Operation Chapter 6 Basic Operation V ersion 4.0

Part 1

6.8 Discarding Picked Parts

On the FCP IV-3 data is managed for the picked parts that are at each

station. In the case that distribution of part information to each station

cannot be guaranteed, the picked parts will unavoidably have to be

discarded in order to preserve placement accuracy and reliability.

The discarding of picked parts will be carried out in the following cases.

• After an emergency stop

After the occurrence of an emergency stop the status of the parts that

have been picked and vision processed may not have been preserved.

If the cam axis is rotated manually (using the cam handle) the picked

parts will be discarded since there is a possibility that the information

for the processed parts is different from the actual status of the parts.

• After the cam axis has been inched

For the same reason as mentioned above, picked parts will be

discarded if the cam axis is rotated via inching since there is a

possibility that the information for the processed parts will be

different from the actual status of the parts.

• After the placing sequence order has been changed

If the number of the placing sequence or a block skip is specified by a

command operation, the picked parts will be judged as useless and

thus discarded since the placing sequence order will have changed.

• Execution of the nozzle center measurement command

Picked parts will be discarded when nozzle center measurement is

carried out since these parts are a hindrance to the execution of this

command.

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FCP IV-3 Operation

Chapter 6 Basic Operation

Version 4.0

Part 1

1 – 46

FCP IV-3 Operation

Chapter 6 Basic Operation

Version 4.0

Part 1

7. Nozzle Center Measurement

In order to achieve high placing accuracy, the FCP IV-3 stores data on the center

of rotation of nozzle holders, the amount of bend and other such data for each

nozzle. These values are used in effect for center compensation in the

measurement operation. Nozzle center measurement is an indispensable part

of being able to carry out highly accurate image processing.

This chapter provides an explanation of this nozzle center measurement.

7.1 An Explanation of Nozzle Center Measurement

Nozzle center measurement

carries out a measurement of

the center of rotation of

nozzle holders. The amount

of bend in the nozzle is also

measured at the same time.

The distance from the center

of rotation to the nozzle tip is

calculated. The nozzle bend

is compared to the amount of

allowable bend (bend

tolerance) and a decision is

made. When the nozzle is

rotated 180° this yields the maximum amplitude of the nozzle tip and thus

the maximum amount of bend tolerance.

The nozzle center measurement is carried out twice on a single nozzle.

The first measurement looks at the current nozzle tip position. The

second measure of the nozzle tip position is carried out after the nozzle

has been rotated 180°. During this second measurement the maximum

amplitude of the nozzle tip, the center of rotation and the degree of nozzle

bend are calculated.

Further, in order to gain an image of the nozzle tip for nozzle center

measurement, image processing for a single nozzle is carried out using

both a standard (wide view) camera and a narrow view camera since the

camera resolution, field of vision and other such variables are different.

Note: The narrow field of view camera (in effect the image is magnified by this

camera) has a small area image and is not used to perform nozzle center

measurement on nozzles with a diameter 2.0 mm or greater.

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FCP IV-3 Operation

Chapter 7 Nozzle Center Measurement

Version 5.0