KE-750_MAINTE.pdf - 第114页

3.13 Bad Mark Detection The bad mark detection is performed as follows: ① Move the X-Y axes to the bad mark det ection coordinate. In this case, when starting movement, the LED of the bad mark sensor is simultaneously tu…

Angular correction value θ can be obtained as the angle made by vectors

(M1→P) and (M1'→P'). So, it can be obtained as follows:

(x' - x1')

(Y' - y1')

(xp - x1)

(yp - y1)

- atan ( )θ = atan ( )

For the BOC mark of two points (the same for IC mark)

As shown in the figure above, the theoretical coordinate of the BOC mark of two

points is defined M1 and M2, and the coordinate where each mark is detected is

defined M1' and M2'. In this case, coordinate Mv is where point M2 is rotated

by 90° with point M1 set at the center, and coordinate Mv' is where point M2' is

rotated by 90° with point M1' set at the center. Using Mv and Mv' as the

theoretical coordinate of the 3rd BOC mark which is virtual point, and using M1,

M2, M1', and M2' as the physical coordinate, in the same manner as the BOC

mark of three points, coordinate correction can be made by obtaining the

coordinate of point P' from the coordinate of point P.

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3.13 Bad Mark Detection

The bad mark detection is performed as follows:

① Move the X-Y axes to the bad mark detection coordinate. In this case,

when starting movement, the LED of the bad mark sensor is simultaneously

turned on.

② When damping of the X-Y axes is complete, the status of the bad mark

sensor is read, and execution or skip of the circuit is recorded. Then, the

LED of the bad mark sensor is turned off.

③ Steps ① to ② are repeated from circuit No.1 to the last circuit.

The order of the circuits subject to bad mark detection is the same as the one

for the BOC mark. For non-matrix split boards, the order of the number is the

one for the circuit location input from the board data input. For matrix split

boards, it is to be counted in an increasing order of the X axis at the side of the

circuit close to the machine origin of the X axis. This is repeated in increasing

order of the Y axis from the machine origin side of the Y axis. (See the figure

below.)

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3.14 Feeder Drive Timing Chart

When standard feed is performed (Forward

only

)

Z Up

Down

Knock for feeder send

When pick attitude is to be held

Z down

Waiting time for arrival

Vacuum check

Knock for feeder send

When push up knock to the part is required (44 mm)

Z down

Knock for push up

Knock for feeder send

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