Dek-265GSX-User-Manual.pdf.pdf - 第86页

54. Remove the head prop. Lower the printhead using two button control. 55. Press the System button. 56. Select Exit (F8). Exit 57. Go to Stage 7. 1.70 User Manual Software Version 6 MACHINE PROGRAMMING STAGE 6F

48.

Select Home Position (F7).

Home

Position

49.

Select Raise Head (F2).

Raise

Head

50. Raise the printhead using two button control. Fit the head prop.

51.

Select Board Clamps (F3), to open the clamps.

Board

Clamps

52. Remove the board from the rails.

53.

Select Head (F2).

Head

Software Version 6 User Manual 1.69

MACHINE PROGRAMMING

STAGE 6F

54. Remove the head prop. Lower the printhead using two button control.

55.

Press the System button.

56.

Select Exit (F8).

Exit

57. Go to Stage 7.

1.70 User Manual Software Version 6

MACHINE PROGRAMMING

STAGE 6F

STAGE 7

Vision System Setup

Introduction

The printer uses a vision system to carry out the following:

• Stencil/Board Alignment

• 2Di Inspection (optional)

• Board Identification - Selective Print/Pass Through (optional)

After the board is fed to the board stop position, the camera moves into position

to view the relative board and screen features. The information from these

camera images is used by the vision system to identify the board, if selective

print/pass through is enabled and to calculate the screen correction needed to

align the screen to the board. The camera and vision system is also used for 2Di

inspection, if enabled, for further information refer to the 2Di chapter in this

manual.

Fiducials A fiducial is an alignment mark which is produced as a part of the artwork of the

board and the screen. There are normally several of these marks on each board,

some of which are used for board alignment and some for alignment when

placing components on the board. These marks, therefore, should be in the same

relative position on both board and screen.

The vision system has a library of synthetic fiducials of the most commonly

found shapes. The dimensions of these fiducials can be tailored by the operator

to fit the fiducials on the board and screen. After the vision system has been

taught these fiducial parameters, it is able to search the field of view of the

cameraand recognize any features which resemble these fiducials. The centre of

the fiducial is calculated and used as the point of location.

The vision system conducts a search in the field of view of the camera looking

for any shape that resembles the programmed fiducial. After finding a shape itis

assigned a score comparing itsshapeandsize to the shape andsizeof the fiducial

in the vision system memory. This score is set between 1 and 999, the better the

fit the higher the score.

NOTE

However, this does not mean that a fiducial score of 900 for example aligns more

accurately than a fiducial score of 700 for example.

This score is used, in conjunction with acceptance parameters set by the

operator, to recognize the fiducial. The available fiducial shapes are:

• Circle

• Rectangle

• Diamond

• Triangle

• Double Square

• Cross

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MACHINE PROGRAMMING

STAGE 7

CIRCLE CROSS DIAMOND TRIANGLE RECTANGLE DOUBLE SQUARE