Duplo DBM 350

It must be my week for breakdowns!

The booklet maker can run fine for hours on end with no problem but then randomly start failing to eject the booklet from the stitching area, the staple are well formed and not deformed - its almost like something is sticking and keeping hold of the booklet but we cant see what - I have checked the clinchers and they all seem free.

Any suggestions before it drives us insane

Thanks
Chris

Welcome to insanity. Look at the stitch head stopper fingers. Is it broken? Or is it sluggish when dropping out of the way? If it gets warm and sluggish it will delay the book movement and cause a false jam.

Pennypicher said:

Welcome to insanity. Look at the stitch head stopper fingers. Is it broken? Or is it sluggish when dropping out of the way? If it gets warm and sluggish it will delay the book movement and cause a false jam.

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We actually thought it was the stopper that was the problem, but we have replaced the selinoid that controls it and ensured its well oiled and to the best of our experiance its certainly free. It definatly is weather/usage dependant as the longer/harder its used the more likely it is to play up. we bookleted around 700 books this morning with no problems and now we cant get 2 in a row out of it.

So when the book gets stapled the stopper drops down and the pusher on the center belt advances the book forward. When this happens what happens to the book is it crunched or does it just sit there till another crashes into it? What size sheet and how many pages>

So the book gets stapled and the pusher begins to push it but its like the stopper doesn't drop in time or the book is held somehow in the stitching area and it gets all crunched up as its forced into the exit shute. The thinner the book the worse it is because it has no weight or stiffness to it. I cant work out if its the stitching heads that are holding the book and causing the crash or if its the stopper that is not dropping down fast enough. I would have thought that the new selenoid would have helped in that regard. I do have some spray lubricant which I might try spraying all over the stopper mechanism to see if that helps.

Is it every book now? Maybe try a bunch with no staple just to eliminate them. Try leaving the rear jog loose so there is NO pressure against the front stopper first.

Hi.

This is getting more weird as time goes on.

If I send it through 6 sheets of 80gsm paper that is blank they will staple and exit correctly all day, the minute I switch it to the actual printed books it fails! exact same paper etc the only difference is one is printed the other is not!

Things I have now tried.

1. released the stopper so it was down all the time - this ruled out that it was slow to drop causing it to back up.
2. Increased the length of the paper in the settings to try and give it a bit more wiggle room
3. Turned off stitching so that it did the fold only and it will run all day like this - narrows it down to the stitching only.
4. Removed 1 stitching head in turn and ran it with only one head in at a time and it jammed every single time.
5. Swapped stitching heads over so they are in different positions and it still jammed every time - this rules out the stitching heads.

I have also experimented with staple length to see if that makes a difference but even if I run it with the legs almost touching or with a gap in the legs its still the same.

The only thing left I can see is the clincher assembly but because its common to both heads I think I can rule out each clincher assembly which leaves only the link bar that is between them - could this not be dropping down fast enough to release the staples before the pusher comes to push out the paper?

This would potentially explain why stiffer books or books with more pages go through because there is more mass for the pusher to push the book free even if its not fully released yet.

I have oiled this bar and the tracks in slides in and to the best of my ability it looks free to move.

Any more suggestions!