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INFINITY EX CAME RA SYSTE M MODULE CALIBR ATIONS Chapter Issue 3 J an 04 Technical Reference Manual 17.47 part of the calibration data. Calibr ation Pr ocedure NO TE The vision height adjustment must be carried out prior…

INFINITY

CAMERA SYSTEM MODULE

CALIBRATIONS

17.46 Technical Reference Manual Chapter Issue 3 Jan 04

8. Select Maint. Select Set Prefs.

9. Select Board Stop X Offset and enter the value recorded in Step 11 above.

10.Select Exit twice.

Vision System

Calibration

For the vision alignment to function accurately a full system calibration is

required. This should be carried out by the maintenance personnel at the

required period and during installation of the machine.

The calibration of the vision system is carried out in two stages using a

calibration screen, DEK Part No. 134764, containing 25 equally spaced fiducials

and a calibration board, DEK Part No. 134765.

The first stage, Calibrate Vision is employed to precisely calibrate the machine’s

alignment system in the X, Y and Theta axes. Once the vision system is aligned

any alignment errors between the screen and board can be effectively reduced.

If this calibration is not carried out at the required periods there is an increased

possibility of misalignment of the vision system thereby; screen to board errors

cannot be eliminated causing misaligned prints.

Calibrate Video X, Y calculates the screen movement in millimetres to vision

system pixels. This is achieved by looking up at the calibration screen fiducials

and moving the screen in the X and Y directions by a fixed amount, for each of

the 25 fiducials.

The movements are calculated for each fiducial and the mean taken. This

average screen movement is recorded and used as part of the calibration data.

Calibrate Theta calibrates the screen theta movement. The camera selects three

screen fiducials and the screen moves in theta (using the two X axes and

implementing +2mm in X rear and -2mm in X forward to achieve the theta

movement). The movements are calculated for each fiducial and the average

taken. The data is recorded and the calibration is complete.

The second stage, Calibrate Offset is to compensate for any optical discrepancies

of the telecentric camera between viewing the board and screen, caused by

tolerances in machine build and or manufacture of the camera. This calibration

eliminates any resultant constant offset errors in print results produced by the

camera. If this procedure is not carried out at the required periods the resultant

prints may have a constant offset error present.

This is achieved by printing the calibration screen and measuring the differences

between the centroid of the screen fiducials and the centroid of the printed

fiducials. The average of these differences are calculated, recorded and used as

Set Preferences

.. more

CHANGE MODE OPTION

SCREEN SIZE

PAPER/SOLV/PASTE LOW

IMAGE RECORDING

UNDER SCREEN CLNR

TRANSPORT WAIT MODE

CLAMP TYPE

SNUGGER THICKNESS

DISPLAY TYPE

FIDUCIAL MONITORING

FIDUCIAL SEARCH

BOARD STOP X OFFSET

SPC PORT CONFIG

RAIL JUSTIFICATION

MANUAL

265

WARN

OFF

STANDARD

BOARD CLAMPS

1.6 mm

TYPE 2

SMART

DISABLED

28.0 mm

EDIT

Front

INFINITY

CAMERA SYSTEM MODULE

CALIBRATIONS

Chapter Issue 3 Jan 04 Technical Reference Manual 17.47

part of the calibration data.

Calibration

Procedure

NOTE

The vision height adjustment must be carried out prior to calibrating the vision

system

The calibration sequence is as follows:

a. Select Setup and use Load Data and recall the CALIBRA. file.

b. Insert the calibration screen.

c. Adjust the print parameters so that a good print quality of the calibration

fiducials is achieved.

d. Use the Maint function and select the vision calibration modes. These

modes should be used in sequence and are as follows:

• Stage 1 - Calibrate Vision

• Stage 2 - Calibrate Offset

Stage 1 - Calibrate

Vision

NOTE

DEK recommends that the calibration board and screen are cleaned with

Isopropyl Alcohol (IPA) impregnated lint free wipe prior to calibrating vision or

offset.

1. Press Setup.

2. Press the Mode key repeatedly until Step is displayed on the main control

screen.

3. Press Load Data, select the Calibra file from the listing. Press Load, press

Exit. Calibra is loaded and fiducial training takes place.

4. Press Setup.

5. Press Change Screen. If there is no screen fitted the message, ‘Insert

Screen’ is displayed in the message prompt bar. If a screen is fitted the

machine ejects it, displaying the message ‘Remove Screen’ in the message

prompt bar.

SEMI 2

Run Head

Paste

Load

Clean

Screen

Adjust Setup Monitor Maint.

Mode

Load

Data

Edit

Data

Setup

Squeegee

Change

Screen

Change

Tool in g

Change

Language

Exit

Mode

Load

Data

Edit

Data

Setup

Squeegee

Change

Screen

Change

Tool in g

Change

Language

Exit

Run Head

Paste

Load

Clean

Screen

Adjust Setup Monitor Maint.

Mode

Load

Data

Edit

Data

Setup

Squeegee

Change

Screen

Change

Tool in g

Change

Language

Exit

INFINITY

CAMERA SYSTEM MODULE

CALIBRATIONS

17.48 Technical Reference Manual Chapter Issue 3 Jan 04

6. Raise the front cover and remove the screen, if fitted. Insert the calibration

screen so that the front edge of the screen frame is approximately flush with

the panelling on the machine. Close the cover and press the System button

and press Change Screen. The screen automatically loads into the machine.

7. Press Exit.

8. Press Maint.

9. Press Calibrat Vision.

10.Press Screen OK key, the table moves to transport height and the camera

moves to the board stop position.

11.Place a calibration board, fiducials uppermost, onto the upline conveyor,

press Auto Board. The board moves to the board stop position.

12.Press the Step key, the board is clamped to the rails and the board stop

retracts.

13.Press the Step key, the camera moves to the first fiducial (rear left corner).

14.Using the Incr. and Decr. buttons and viewing the right hand side of the

vision monitor, position the screen fiducial so that it is placed centrally about

the box displayed. On completion of positioning the first fiducial, press Step

and repeat the procedure above for the three fiducials positioned on the

remaining three corners.

The control screen displays the following message, ‘Printer configuration

data filed saved’.

Mode

Load

Data

Edit

Data

Setup

Squeegee

Change

Screen

Change

Tool in g

Change

Language

Exit

Run Head

Paste

Load

Clean

Screen

Adjust Setup Monitor Maint.

Calibrat

Pressure

Calibrat

Offset

Calibrat

Vision

House

Keeping

Set

Prefs

Diagnost

Test

Cycles

Exit

Screen

Restore

Defaults

Change

Screen

Exit

Auto

Board

Manual

Board

Knead

Paste

Exit

Step Head Single Exit