SiplaceX4_en - 第471页

1 - 3 S tudent Guide SIPLACE X Edition 09/2005 10 Modular conveyor 3 10 Modular conveyor 10.1 Description of the functions 10.1.1 General The placement system is suppl ied with a PCB single conveyor as standard. A dual c…

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Student Guide SIPLACE X

Contents Edition 09/2005

10.2.12 Checks after mechanical work on the conveyor . . . . . . . . . . . . . . . . . . . . . . . . . . 32

10.3 Conveyor control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

10.3.1 TSP 301 transport control for HF. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

10.3.2 Transport control board TSP 301 with Siemens interface(Option) . . . . . . . . . . . . . 34

10.3.3 LED display on the TSP 301 conveyor control . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

10.3.3.1 Assignment table: LEDs on the TSP 301 conveyor control . . . . . . . . . . . . . . . 36

10.3.3.2 Siemens/SMEMA TSP 301 interface description . . . . . . . . . . . . . . . . . . . . . . . 38

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Student Guide SIPLACE X

Edition 09/2005 10 Modular conveyor

10 Modular conveyor

10.1 Description of the functions

10.1.1 General

The placement system is supplied with a PCB single conveyor as standard. A dual conveyor is

available as an option. Depending on your requirements, you can choose the left or right conveyor

side as a fixed conveyor side.

In the Processing Area (PA1 or PA2), the PCB board will be clamped from the bottom side against

the fixed holder on the conveyor system.Therfore, the distance between the top of the PCB board

and the placement head will always be the same for every PCB board, regardless of the PCB tick-

ness.This has the following advantages:

– The placement rate is also no longer dependent on the PCB board thickness.

– Furthermore, the fiducial recognition can be optimized, because the distance between the PCB

and the PCB camera is always the same.

– The PCB fiducial shape is optimally imaged on the CCD chip of the PCB camera.

The PCB conveyor is configured in the placement machine so that components up to 6 mm high

can be placed with the 12-segment Collect&Place head or components up to 8.5 mm with the 6-

segment Collect&Place head.

The machine height can be selected to allow the machines to be integrated into lines with a trans-

port height of 830, 900, 930 or 950 mm. The PCB conveyors can communicate with the individual

machines via the SMEMA or the SIEMENS interface.

Movement of the PCBs in the input conveyor, intermediate conveyor and output conveyor is mon-

itored and controlled with light barriers consisting of a sender module and a receiver module:

– When the PCB reaches the placement area, the PCB is detected by a light barrier and the

speed of the conveyor belt is reduced.

– Around 100 ms later, a laser beam detects the leading edge of the PCB as it slowly moves in.

This stops the PCB, which is then clamped from below.

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Student Guide SIPLACE X

10 Modular conveyor Edition 09/2005

10.1.2 Clamping

The PCB is lifted for placement of components and pressed up against the PCB clamping rail.

When the lifting table rises the PCB and the complete conveyor drive unit is lifted up to the clamp-

ing position. Therefore the placement level is constant and independent of the thickness of the

PCB.

PCBs up to 450 mm long are clamped in the appropriate placement areas. Clamping does not

take place on the input and output conveyor. PCBs that are more than 450 mm long (max. 610mm)

lie on the belts up to a length of 450 mm, but are only supported by the lifting table in the placement

area.

10.1.3 Width adjustment

The width is adjusted by means of a motor as programmed. With the dual conveyor, different

widths are possible for the two conveyor tracks. The width is adjusted with a stepping motor to

allow the new PCB width to be set independently of the other machine components (e.g. Y-axis).

There is no BERO proximity switch on the conveyor rail.

The conveyor rails are fixed by means of a clamping unit on a steel strip.

The PCB width is adjusted via three drivers, they are fitted near the input conveyor, at intermedi-

ate conveyor and near output conveyor.

– The three drivers are moved synchronously by the stepping motor by means of ball screws and

a toothed belt.

– The three drivers are positioned under the conveyor rail to be moved in order to adjust the PCB

width. The precise position is detected by a BERO on the driver.

– The conveyor rail is mechanically connected to the driver by extending the pneumatically-ac-

tuated fixing pins. This disable the clamping of the conveyor rail (at the steel strip).

– Once the new PCB width is reached the fixing pins of the driver are retracted once more. The

conveyor rail is clamped again.

On the dual conveyor, the widths of the conveyor tracks have to be set one after the other (just

one drive for both conveyor tracks). The maximum and minimum PCB widths are protected by limit

switches. If the two conveyor rails of a conveyor track are not parallel, this is automatically cor-

rected during the width adjustment. The three drivers are moved under the fixed conveyor rail and

depened on the average value of the positions of the three drivers will be adjust the moveable con-

veyor rail. The driver that reaches its position under the moveable conveyor rail first fixes the con-

veyor rail. The movement then continues until the second and third drivers have reached their

positions and have also fixed the moveable conveyor rail. The conveyor rail is now conected and

the correct PCB width can be set. The moveable rail is adjusted according the width adjust. units.

The flexible dual conveyor can also be used as a single conveyor by closing up track 2 (max. PCB

format 450 x 450 mm).