I'm new to this forum and am hoping I can get some direction and or conformation on trouble shooting a slur issue I'm having on a Komori SP40. It's 6 over 6 no coater. I recently had a jam in the infeed. 5 bad sheets made it thru the double sheeter and folded in the infeed forcing the swing arm back an inch off of factory set and breaking four of the gripper pads on swing arm two on each side of infeed inside of a 36 inch sheet marker. No sheets made it thru the the press, but day shift operator swears up and down jackets were damaged. Since the incident we have 0 set swing arm to spec and replaced only the gripper pads damaged and replaced almost all jackets and yet we are still getting slur on all image top and bottom primarily at the tail and always the same amount of dot. I know all gripper pads should have been changed out on the swing arm on account of wear. But day shift lead pressman is fighting me on it. Am I right or wrong or am I ruling out something more complex?
I would check if the "A" cylinder bearrings are OK or damaged. I fail to believe the problem is with the gripper pads and if all grippers are set right , can't see the problem there. What do Komori say ?
Unfortunately Komori has givin us two different answers. One tech says all the pads should have all been replaced on acount of the miles on the press and one says no. So managment is going with no cause it costs less.
what ??? Komori gripper pads do not go by the mile...they hold like for ever. If some have been damaged by the crash (fail to see why) , the rest should not be an issue... I would ask Komori to send in one of the Jap's to give a 3rd opinion.... Meny
The Gripper pad assembly on the swing arm before the register drum are ridiculously cheap. They are made of cheap cast aluminum with a hard rubber pad. From the Register drum all the way to the Delivery I know they will last almost forever. But the swing arm pads are very prone to wear. I'll take photos monday and attach them.
sorry , sorry.. Had an LS in mind , not an SP.... Do not like them , not built as good as the regular ones - similar to the H machines... May be stepping on some toas...but , that's my opinion...no offence
None taken. It really is a good Publication press and with the amount of time we spent on R&D after install we can run nice high end pieces such as high quality annual reports etc.. Its not for everyone. We've been profitable with it. This is the first we have had an issue with print quality, all be it is on account of a crash. Thanks for your input Meny.
Firstly I agree with the comments about the swing gripper pads, if there is doubt change them to eliminate a cause, not too expensive. If it is doubling all through the machine I would also look elswhere. You say you have changed nearly all the cylinder jackets? Who did this because I know from experience how very difficult it is to get it right. You only need a few microns difference in size to get significant doubling, usually at the tail. Tension and front edge fitting need to be exact. I would check tension first then pull solids in cyan with the pressures backed out so the solid is just breaking, then check the prints from each unit in relation to each other. Assuming your blankets are good, packed identically and tensioned the same, the printed solids should be identical. Bet they aren't. YG
As a Komori engineer with experience of SP I know they are good presses. If you don't know the machine you shouldn't condemn it. Did anyone check the pad bar in the swing arm? I have seen these bend and cause print problems.
+1 Pad bar. Seen it on three different komoris after chasing the same stuff. Not cheap or fast. Took most of a morning to half a day if all went well
