Linear sensors used in TV screen manufacture.

Philips Components is using Penny & Giles SLS32O sealed linear
sensors, in a process which manufactures 600 TV screens an hour.

Following a recent rebuild of its two glass presses, the company
specified the sensors to provide feedback on the position of a plunger
and a press table during the screen moulding process.

The company required sensors capable of withstanding the extremes
of temperature experienced during the moulding process. The sensor
already fitted to the presses was neither fast enough (at 100 milliseconds)
nor accurate enough for the purpose. The SLS32O sensors, besides
being extremely accurate, also provide readings every 10 milliseconds.

"Penny & Giles has supplied sensors for other process applications at
Philips and, with standard lP66 sealing on the SLS32O, were the natural
choice for this one," said engineer Nancy Richards.
"A glass gob is dropped from the furnace feeder into a mould, where a
plunger is used to press the glass into shape.

One sensor is attached to the plunger to provide two position measurements
- the first when it reaches the glass gob, and the second when the mould
is filled and the plunger has reached its dead point. Three other SLS32Os
are fixed to the underside of the press table which carries 11 moulds, to
indicate where the table is in three predetermined positions, enabling
gobs to be placed precisely on the table."

Data from the sensors is fed into a computer which, as part of a new
production control system, is providing accurate information to help
monitor the screen-making process.

For more information contact:-

Penny & Giles Controls Ltd.
Tel: +44(0) 1202 409409

July 2001

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