SiplaceX4_en.pdf - 第69页

1 - 45 S tudent Guide SIPLACE X Edition 09/2005 2 Overview 45 Controlling the PCB inside the conveyors 2 The PCB is check ed with light barr iers (transm itter module and receiver module). The light barrier transmitter i…

1 - 44

Student Guide SIPLACE X

2 Overview Edition 09/2005

2.2.13 Conveyor system

2.2.13.1 General

The standard Siplace X machine is supplied with a single conveyor. The dual conveyor system 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, the PCB board is clamped from the bottom side against the fixed holder

on the conveyor system. The distance between the top of the PCB board and the C&P Head there-

fore remains the same for each PCB board, regardless of the PCB thickness. This means that the

placement rate is also no longer dependent on the PCB board thickness. Futhermore, fiducial rec-

ognition can be optimized, as the distance between the top of the PCB board and the PCB camera

is always the same. This ensures that the fiducial shape image on the CCD chip of the PCB cam-

era remains in focus.

The 12 C&P head can handle components with a maximum height of 6 mm, the 6 C&P head com-

ponents with a maximum height of 8.5 mm and the C&P20 head components with a maximum

height of 4 mm.

The conveyor system uses a SMEMA or SIEMENS (optional) interface for communication be-

tween the PCB conveyors on different machines and can be adjusted to heights of 830, 900, 930

or 950 mm.

The transfer of PCB boards is monitored and controlled with light barriers which consist of a trans-

mitter module and a receiving module. When the PCB board arrives at the placement area, it is

recognized by a laser beam; the conveyor speed is reduced and the board is clamped into position

from the bottom side.

Clamping 2

The PCB is lifted for the placement process and pressed against the PCB holder (guide rails on

the side). As the lifting table moves upwards, the PCB is lifted and clamped into place with the

complete transportation drive unit. The placement level remains, irrespective of the PCB thick-

ness.

PCBs with lengths up to 450 mm (368mm for the HS60) are clamped in their respective placement

areas and not in the input or output conveyors. However, PCBs with lengths between 450 mm

(368mm for HS60) and 610 mm are placed on the conveyor belt and are only supported by the

lifting table when in the placement area.

Width Adjustment 2

Width adjustment is performed via a motor, after reception of a job from the Siplace Pro computer.

The two conveyor tracks of a dual conveyor can have different widths. The width adjustment step-

ping motor allows PCB widths to be adjusted independently of all other machine components(e.g.

axis gantry). The width adjustment proximity switch on the conveyor side is no longer needed.

The PCB width is adjusted with 3 adjusting units (pneumatic cylinder), installed under the input,

intermediate and output conveyors. These adjusting units are moved synchronously back and

forth by a ballscrew and belt, driven by the stepping motor.

1 - 45

Student Guide SIPLACE X

Edition 09/2005 2 Overview

Controlling the PCB inside the conveyors 2

The PCB is checked with light barriers (transmitter module and receiver module). The light barrier

transmitter is positioned below the conveyor belt and the receiver opposite to it, above the belt.

The light barriers stop the PCB in the input conveyor, intermediate conveyor and output conveyor.

The signal from the light barrier in the placement areas, triggers the brake application of the DC

motor and switches the laser (stopper) on. The PCB then moves in a set time (100ms) and with

reduced speed to the stop position (laser). The software-controlled brake application is adjusted

to suit the weight of the PCB, ensuring a constant travel time for all PCBs.

PCB stopper 2

The PCB in the placement area is stopped via a laser light barrier. The laser light barrier recog-

nizes the front edge of the PCB and stops it. This prevents the PCb hitting the stopper.

The position accuracy of the PCB is +/-0.5mm.

– A mechanical stopper for long boards up to 610mm is available as an option

Lifting table 2

Each placement area has one or two lifting tables working independently of one another (dual/sin-

gle conveyor). The lifting table is driven indirectly via a pneumatic cylinder controlled by a 5/2 way

valve. Different PCB thicknesses are automatically compensated. The vertical guide for the lifting

table plate (up/down) is defined at four points. The lifting distance is determined via an incremental

system.

The upper position is controlled via the measurement system with incremental encoder and a set

time period. The transport motor checks whether clamping was successful.

The lower position is checked via the measurement system and a proximity switch (BERO) on the

pneumatic cylinder, plus a set time period.

Additional we check the time which we need in both directions.

The clearance under the PCB is 40mm.

The old, 74 mm high, red PCB supports must not be used on the HF and Siplace X ma-

chines.

The dual conveyor can be used as an single conveyor when you move the conveyor rails of track

2 together (flexible dual conveyor).

1 - 46

Student Guide SIPLACE X

2 Overview Edition 09/2005

2.2.13.2 Construction of Single Conveyor

The single conveyor consists of the input conveyor, two placements areas, intermediate conveyor

and output conveyor. Each conveyor has automatic width adjustment and a lifting table for clamp-

ing the PCB.

Fig. 2.2 - 29 Construction of PCB conveyor

2.2.13.3 Construction of Dual Conveyor

Dual conveyors have two transportation tracks (1 and 2). In the standard conveyor, the right-hand

side of each track is the fixed side. The fixed conveyor side can be changed to the left, where re-

quired.

Fig. 2.2 - 30 Construction of dual conveyort

(1)Input conveyor (2)Conveyor for placement area 1

(3)Intermediate conveyor (4)Conveyor for placement area 2

(5)Output conveyor (6)Lifting table 1

(7)Lifting table 2 (8)Conveyor vat

(1)Input conveyor (2)Conveyor for placement area 1

(3)Lifting table 1 (4)Intermediate conveyor

(5)Conveyor for placement area 2 (6)Lifting table 2

(7)Output conveyor (8)Conveyor vat