D-serie level 1 EN.pdf - 第93页

C&P6/12 Placement Heads C&P12 in Basic Positon Star 15° Placement Procedure S tude nt Guide Advanced Level 1 SIPLACE D-Series EN 05/2 007 C&P6/12 Placement Heads 6-13 6.2.2 C&P12 in Basic Positon St ar 15…

C&P6/12 Placement Heads

Placement Procedure Air Blast and Vacuum Supply - Description

Student Guide Advanced Level 1 SIPLACE D-Series

C&P6/12 Placement Heads EN 05/2007

6-12

6.1.10 Air Blast and Vacuum Supply - Description

The two diagrams show that there are 3 states for air supply to the segments.

 Electromagnetic valves ON & valve plunger inside: air blast is present at the segment for placement

(reject).

 Electromagnetic valves OFF & valve plunger inside: the segment is airtight i.e. it is cut off from the

air blast and vacuum supplies.

 Valve plunger pulled (towards back): the connection to the vacuum supply exists, even if the

electromagnetic valve is switched on.

This function description illustrates that the valve plunger is the element with the greatest influence on

the placement and pickup reliability. It is therefore important to maintain this key part with the tools

specially developed for this purpose.

6.2 Placement Procedure

6.2.1 Working Position on Placement Head

6-9: Working position on placement head

Legend

1. optical centering

2. Turning station / DLM2

3. Service position for segment: check/remove

the nozzles and sleeves

4. Pickup and placement station (reject station

for D1/D2 and D3)

5. Reject position for D4 machines

6. Direction of operation

7. Position of component sensor option (only

C&P12)

C&P6/12 Placement Heads

C&P12 in Basic Positon Star 15° Placement Procedure

Student Guide Advanced Level 1 SIPLACE D-Series

EN 05/2007 C&P6/12 Placement Heads

6-13

6.2.2 C&P12 in Basic Positon Star 15°

6.2.3 Boards – Position Recognition

Board position recognition is used to determine the exact position of the board in the machine (conveyor

--> placement area). There should be at least two fiducials on the board. These are then used to

calculated the X/Y position and the rotary angle of the board, in the conveyor system. A maximum of 3

fiducials can be programmed for position recognition. The fiducials should not be on the same line as

one another. In addition to determining the position of the board in the conveyor system, this 3rd fiducial

enables you to determine and correct any displacement within the board (jolted, stretched).

6.2.3.1 Temperature Compensation

In addition to board recognition, SIPLACE D-series machines perform temperature compensation with

the 2nd gantry in the placement area, through PCB position recognition. This compensates another error

source which could affect accuracy.

6-10: C&P12 in basic position star 15°

Star position:

Digits: 15000

Angle 15°

1° is equivalent to 1000 digits

This is the basic C&P12 setting. When the X and

Y axes are in the waiting position, the star axis is

rotated into this basic position (30° at C&P6).

6-11: Board recognition in SIPLACE D4

Legend

1. Gantry 1

2. Gantry 2

3. Gantry 3

4. Gantry 4

5. Transport direction

Gantry 4: position recognition with max. 3

fiducials,

Gantry 2: position recognition with max. 2

fiducials, in PA 2 of D4

Gantries 1 and 3: Temperature compensation

by approaching the fiducials - a position

difference to gantry 4 or 2 is recognized by the

Vision system and is then taken into account and

compensated in the following placement

procedure.

C&P6/12 Placement Heads

Placement Procedure Boards – Position Recognition

Student Guide Advanced Level 1 SIPLACE D-Series

C&P6/12 Placement Heads EN 05/2007

6-14

6.2.3.2 PCB Position Recognition - Centering the PCB Fiducials

6-12: Board recognition run to target position of board

A fiducial is expected at this target position. The

PCB camera moves out of the waiting position to

this fiducial position.

 PCB position recognition is performed,

generally before the gantry takes up the 1st

component.

 The gantry axes move the PCB camera to the

theoretical fiducial position. The camera

records an image of the 1st fiducial. The Vision

system calculates the center position.

6-13: PCB position recognition - centering the PCB fiducials

The centered fiducial now defines the actual

position of the board.

 The camera takes a shot of the 2nd fiducial

and the Vision system calculates the center of

the image.

 A second calculation detects any deviation

between the target fiducial position and the

position actually determined.

 All PCB fiducials are optically centered using

this method.

 This data is then sent to the machine

controller.

 The corrected values are then used for the X/

Y and angle positions of the board.

 The gantry axes now move the placement

head to the first pickup position.

NOTE: SIPLACE Vision or synthetic fiducials

If synthetic fiducials are used, this does not change the procedure described; although inkspot

recognition is performed after fiducial recognition.