In a message dated 98-03-27 12:24:59 EST, [log in to unmask] writes:
<< Hi all.
I have a problem with our Fuji CP642 being able to cut TI
carrier tape. The problem is this:
> "TI's carrier tape is able to cut into single pieces by Fuji CP642 but
> TI's tensile strength is too high. It is 5.3-5.6kg/mm^2 compared to
> 2.9-3.3kg/mm^2 of the others. This physical characteristic allows
> these single cut-carrier tape to sit on top of each other while it
> does not happen with the other vendors. Thus the TI stacked
> cut-carrier-tape are too big and heavy for the air vacuum unit of the
> CP642 (which was designed to deal with single and equal or less then
> 32mm cut-carrier tape only)."
>
Is there anyone else out there with a CP642 having a similar problem
with TI's carrier tape, and if so what have you done to resolve this
problem?
All comments and suggestions will be greatly appreciated, and thanks in
advance!
Kathy Palumbo
>>
Kathy,
Honestly, I'm not trying to be mean or anything, but lemme ask;"...did
anybody else have to read that paragraph a few times before you got the gist
of what Fuji was trying to say?"...don't worry, I've been there too Kathy,
before I got my current job most of the equipment I've worked with has been
Fuji machines...
Anyways, I never had that exact problem with a CP-6, but I have had a
similar problem with all the other CP's...from a CP-2 to a CP-4. Not with the
tape from TI, but with the vacuum hose at the tape cutter getting clogged-up,
which is what I'm assuming is happening, or maybe you have another problem
back there that I've seen, which is the tape not being cut cleanly and causes
the empty section of the tape to jam itself in the area around the waste tape
cutter causing the feeder to mispick...am I right?
When the vacuum hose clogs up, it can keep the machine down for a couple
of hours...it really is a bear getting it unclogged! But before something on
the machine is blamed for that, one thing to be sure of is that the operator
is emptying the waste tape box often enough. If it becomes filled, the tape
cuttings will back-up inside the vacuum hose. It doesn't take long to fill the
box either when you're building memory with 32mm taped components!!
If the boxes are being emptied like they should be, what I found would
cause the problem is simply dull cutter blades, and at $175.00 a set,
(..that's what they were when I bought them) they not be cheap! (but what Fuji
part isn't?). They tend to get dulled quite easily if an operator isn't
careful about making sure the feeder is indexed correctly and the part is in
the correct position before it's loaded on the device table. If it's a half a
pitch off, the machine will start chopping the DRAM's in half, dat' ain't too
good for da' blades! I don't know for sure, but Fuji was supposed to put a
sensor at station #3 to detect whether or not a part was on the nozzel when it
was running production, if it wasn't, the machine was supposed to stop to keep
it from chopping parts in half.
I've never really worked closely on a CP-6, but I'm pretty sure that the
tape cutter mechanism is basically the same type of design as the was the
earlier generation machines...it stayed the same on the CP-2's through
CP-4's.Other than making sure that the blades are perfectly sharp, there's one
other area that you can check. Since the movable cutter blade is cam actuated,
you can slowly rotate the cam and look at the stroke the movable blade is
making. There's an adjustable pushrod that comes off of the cam that you can
fiddle with to change the stroke. I've seen it sometime be set where if you
were running components that were on 32mm tape, it wouldn't open-up wide
enough to let the empty section of carrier tape come in between the blades
cleanly and cause problems.
There's only been one type of tape in all my experience with the FUJI
machines since 1987 that's caused problems. That is some sort of mylar carrier
tape that had a type of aluminumized backing on it...that WAS some tough stuff
to cut! In fact, we used to ask our customers not to supply us components that
was in that type of tape...it was mostly 8mm and 12mm parts. We could cut it,
but only with a fresh set of blades and then it would dull them up pretty
fast. I've never seen that type of tape in 32mm before...
I hope this helps a
little..
-Steve Gregory-
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