RS-1_instruction manual.pdf - 第67页

Part 1 B asic O peration Chapter 1 Overv iew of the Machine 1- 49 (1) Flow of laser align c entering 1) For LNC120 - 8 ① ② ③ ④ ⑤ ⑥ Part attracting Pick the component by driving Z- axis, and adjust the component at laser …

Part 1 Basic Operation Chapter 1 Overview of the Machine

1-48

Centering system

Instead of using conventional mechanical centering system, this machine uses touchless centering

system where LED align sensor is used to read the position and angle of components. This can be

achieved by detecting the shade of the components created by the laser rays applied horizontally to

the components.

LNC120-8

By moving Z-axis up and down, a component is picked with vacuum, and the LED is applied to the

component. A shade is made where the LED is obstructed by the component. By turning the

component along q-axis, the shade changes.

◇ According to the change of the shade, offsets of the position and angle of the picked component

are calculated. These offsets are corrected when mounting.

Caution

If the surface of the glass that covers the component detecting section of the

laser unit is scratched, it causes a component recognition error with laser.

Note the following points to use the machine.

1. Do not use any component whose size exceeds the regulated maximum

component size.

2. Even though a component size is the regulated maximum component size

or smaller, the component may become in contact with the glass surface

when you change the component pick-up position.

Specifications (Maximum component size)

LNC120-8 Square component: □ 50 mm Length of a diagonal line: 70 mm

Glass

Part 1 Basic Operation Chapter 1 Overview of the Machine

1-49

(1) Flow of laser align centering

1) For LNC120-8

①

②

③

④

⑤

⑥

Part attracting

Pick the component by driving

Z-axis, and adjust the

component at laser align height.

Rotation in θ direction starts.

While the θ-axis is accelerating, the system

does not start measuring a component.

Laser align measurement

Edge

When the speed of the rotation in θ direction

reaches the certain value, the system starts

laser align measurement.

Placement

The sensor obtains the edge position of the

area shadowed by a component.

The system saves a beam corresponding to

the edge position as a “tangent line” into the

sensor.

The system obtains the tangent line data on

each angle by rotating the θ axis 360

degrees.

When the θ axis finishes rotating by 360

degrees, the sensor generates and

analyzes the outer shape of a component

based on the tangent line data obtained at

each angle to return the measurement

result to the mounter.

- Component size

(X direction: wX Y direction: wY)

- Distance between the center of the

nozzle rotation and the center of a

component

(X direction: dX Y direction: dY)

- Angle (θ) error: dRz

The system corrects the following errors

and places a component on a board.

Positioning error (dX, dY)

Angle error (dRz)

Part 1 Basic Operation Chapter 1 Overview of the Machine

1-50

(2) Laser align measurement position for major component types

Mold

Square chip

MELF

SOT

SOP/TSOP

SOJ

(Center between the top and bottom

surfaces of the component)

(Center of the component)

(0.25 mm above the top of the component)

(Center between the bottom surface of the

component and the foot of the leads)

(Center between the bottom surface of the

component and the foot of the leads)

Laser align

measurement position

Laser align

measurement position

Laser align

measurement position

Laser align

measurement position

Laser align

measurement position