MYDATA MY500 JetPrinter, Руководство по обслуживанию

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MYDATA
MY500 JetPrinter Machine Systems
P-030-0014-EN – Service Manual
Rev. 0003 2008-06
3 - 1
3.
Machine Systems
This chapter contains brief descriptions of the various systems that make up
the MY500 JetPrinter machine. The object is to give an orientation rather than
an in-depth understanding of the systems. At the end of the chapter you will
find block diagrams.
MY500 JetPrinter
With a technique inspired from computer ink jet printers, solder paste is
printed, stencil less, on Printed Wiring Boards (PWBs). Applying solder paste
with this technique gives more opportunities to design and manufacture PCBs
in an inventive and flexible way. The jet printing process is controlled by
powerful software, which enables fast changeovers and last minute changes.
Jet Printing
The jet printing system is made up of three main parts: the printer itself, the
cassette and cartridge, and a computer offline terminal.
The printer itself is the machines foundation, which integrates the motion
system, the positioning system as well as production conveyers.
The cassette is the heart of the system and contains the solder paste cartridge
and a solder paste ejector. Its main function is to deposit solder paste onto the
PWB with help of a step motor. Ink jet technology (piezo technology) is used
to shoot droplets of solder paste onto the PWBs surface mount lands.
The offline terminal consists of a PC and software. The software is capable to
read CAD files and transfer them into actual machine layouts. Machine
movements are guided by a machine control software, acting on instructions
in the form of a machine programs (layouts).
Piezo technology
With piezo technology the paste is squeezed out of the nozzle by mechanical
pressure. This is made possible by a ceramic piezo crystal, which is also used
in lighters. Its shape changes when it is fed by voltage. This in turn creates
pressure on the paste channel, causing the paste to be expelled from the nozzle.