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User Manual S-23 HM 1 Introduction Software Version SR.405.xx 05/99 Issue 1.13 Overview of the modules - revolver head 41 1.13 O vervi ew of the mod ules - re volver head 1.13 .1 Structure of t he 12-se gment re volver h…

1 Introduction User Manual S-23 HM

1.12 Overview of the modules - gantries Software Version SR.405.xx 05/99 Issue

1.12.3 Technical data for the x axis

1.12.4 Structure of the y axis

The y axis essentially consists of the following main modules: 1

– y axis three-phase AC servomotor

– y axis toothed belt

– y axis guide system

– y axis measuring system

Each y axis is driven by a three-phase AC servomotor. An anti-crash circuit prevents the traversing

paths of the gantries meeting. 1

1.12.5 Technical data for the y axis

Drive Three-phase AC servomotor/toothed belt

Maximum speed 2.5 m/sec.

Traversing path 620 mm

Distance measuring system Metal linear scale

Scale length 646 mm

Resolution 2.5 µm

Drive Three-phase AC servomotor/toothed belt

Maximum speed 2.5 m/sec.

Traversing path of the gantries 910 mm

Distance measuring system Metal linear scale

Scale length 970 mm

Resolution 2.5 µm

User Manual S-23 HM 1 Introduction

Software Version SR.405.xx 05/99 Issue 1.13 Overview of the modules - revolver head

1.13 Overview of the modules - revolver head

1.13.1 Structure of the 12-segment revolver head

Fig. 1.13 - 1 Structure of the 12-segment revolver head

(1) Star with 12 sleeves (2) Motor for "Reject" valve adjustment drive

(3) Turning station (4) Component vision system

(5) Z axis drive (6) Star motor

1 Introduction User Manual S-23 HM

1.13 Overview of the modules - revolver head Software Version SR.405.xx 05/99 Issue

All the components are inserted with the same cycle time. Before the component is inserted, it is

measured by the optoelectronic vision system. 1

– The component vision camera creates an image of the current component.

– The precise position of the component is also determined.

– The package form of the current component is compared against the programmed package

form in order to identify it. Any components that cannot be identified are rejected.

– The turning station turns the component to the required placement position.

1.13.2 Description of the 12-segment revolver head

– The 12-segment revolver head works using the "collect & place" principle, i.e. the components

are held by the nozzles with the aid of a vacuum and, after one complete pick-up cycle, are

placed gently and accurately on the PCB with the aid of forced air. The vacuum in the nozzles

is also checked several times to determine whether the components were picked up and set

down correctly.

– The "adaptive" sensor stop mode of the z axis compensates for any irregularity of the PCB sur-

face when the components are set down.

– Defective components are rejected and are picked up again during a repair run.

1.13.3 Technical data - revolver placement head

Range of components

0402 to PLCC44, including BGA, µBGA, flip-chip,

TSOP, QFP, PLCC, SO to SO32, DRAM

Maximum height 6 mm

Minimum lead pitch 0.5 mm

Minimum dimensions 0.5 mm x 1.0 mm

Maximum dimensions 18.7 mm x 18.7 mm

Maximum weight 2 g

Maximum travel of the z axis 16 mm

Programmable set-down force 2.4 to 5.0 N

Nozzle types 9xx

Angular accuracy 0.7° at 4 sigma

Placement accuracy ± 90 µm at 4 sigma

± 67.5 µm at 3 sigma