Canvas prints banding, help please?

[David Rogers]

Just on canvas? Tried any other media?

Had banding be a damper issue before with stifled ink flow.

Other than that…not sure.

Dave

[Dan Osterbery]

Hi Dave,
been printing all day, have printed on monomeric, polimeric vinyl, blueback paper? Just on the canvas, very odd?

[Chris Wool]

oh nasty

don’t know the exact reason but this is what i would do
give the heads and machine a good manual clean all the fumbling about should get rid of all static.

try a bit with the head speed slowed to 400mm /sec uni-direction might be a bit of ink starvation from a low level cart.

else if new roll material could be suspect.
best of luck

[Dan Osterbery]

All ink carts are over half full in versaworks. Have done a powerful head clean, will do a manual one now. Thanks

Dan

[Simon Worrall]

Cracked end roller mount. Roller not gripping media properly.

Simon.

[Dan Osterbery]

Hi Simon,
have you had a similiar experience? I ask because we changed the rollers last year. It does take a bit of time to remove the end ones? but i will check them again, if this is what was causing banding for you?

thanks

Dan

[Simon Worrall]

Dan
Close the clamps on some material, machine turned on, and tug with your hand.
If you can get it to move youve probably got a crack.
The end roller springs are much stronger than the middle ones, so they are the housings that go first. It is hard to see the crack but you dont have to take the machine apart to see it on a 540.
Yes I had this problem for years, techies couldnt figure it out.
It ruined a lot of banners in that time. It was usually so subtle you couldnt see it. Very light blue was the worst.

Finally I figured it, got free ones off him cos he felt bad, and its been good ever since. 🙂

Simon.

[Dan Osterbery]

thanks Simon, yup left hand end moves much much easier than the right hand side! Just checked and we changed the wheels not the housing, so that might be it! Will order new ones. fingers crossed! Thanks

Dan

[Simon Worrall]

😀

[Chris Wool]

good one simon 😀

of interest is there any bow in the feed direction of the edge of the print as i wood of expected to try and print in a big arc.

[Simon Worrall]

Sorry Chris I didnt understand your question.

[Dan Osterbery]

edges of print parallel. Left hand pinch roller gives a lot easier than the right. So we would suspect its has a drama! Two new ones on the way, as it is recommended to replace both at once! Also fired photos to the supplier of the roll of canvas to see their views on it?

thanks guys

Dan

[Dan Osterbery]

supplier has also agreed to send a new roll of canvas! So will have updates for you soon! Either way with new wheels and new canvas on the way we should hopefully get to the bottom of the problem!

Thanks guys

Dan

[Dan Osterbery]

Hi guys, the new wheels have arrived before the new roll of canvas, how do you change them as they dont come out of the holes is it easy or is it a technician job?

cheers

Dan

[Chris Wool]

Carefully the shaft is held by 2 c clips remove one and slide out the shaft
The wheels should have a red dot one side which if I remember correctly go on the outside need to double check that. Will check a manual when I get back.

yes red dot to the outside of the machine

[Dan Osterbery]

Hi Chris,
thanks, brain not in gear when I wrote the post, it is not just the wheels its the housing as well! We changed the wheels last year, but we need to change the whole housing now.
thanks

Dan

[Chris Wool]

2 different types either one looks a bit more involved

[Dan Osterbery]

Ok have managed to remove the two end wheel assembly’s, we nipped round to a local engineering shop and got them to heat up and bend a phillips screwdriver so we could access the 7mm entrance space. Slowly slowly but managed to get them out! Spoke to roland and the other option is a massive effort dismantling the machine! fingers crossed we can get the new ones in!
New canvas has just arrived so hopefully we can get these jobs out!

thanks for your help guys!

Dan

[Simon Worrall]

Mmm yes Dan I forgot to say its a major effort to replace these mounts…actually I cheated..took off the metal gizmo locator thingy screwed to the top, cut off the back of the bent metal, and put the assemblies in from the front where you put in the middle rollers and slid them to an end position.I removed the cracked ones by bending the metal up from the back. The actual metal tag is to tell the machine where the rollers are, and its bent down at the back to prevent removal.
It saved me from taking the whole thing apart and it works perfectly.

[Dan Osterbery]

Yes we have done something similiar, removed the screws and then prised out the metal and then removed the black assembly through the front, its a swine getting the screws back in! just taken us about half an hour to get the screws in and tighten them! About to start attacking the other one! Will update when we are done!

Cheers

Dan

[Dan Osterbery]

here is the weapon we made to get into the gap and remove the assembly!

---

Attachments:

[Dan Osterbery]

Absolutely fuming! having changed the wheel assembly’s and received the new roll of canvas, and have done three more test prints, we still have the same problem, so i called our canvas supplier, bearing in mind I sent them an email and photos and asked of they had any problems with the rolls of canvas, to which they replied no, but we will send you a replacement roll. Just spoke to someone else at the firm who said they have had loads of problems with humidity in the rolls and it can cause white lines and pink banding!!!! If they had said that the first time, we would have saved masses of ink and time, transport costs for the new roll, and the cost of the assembly’s!! Arrgghh so frustrating! Just thought i would let you know for future people reading the thread! thanks to all that helped.

Dan

[John Harding]

I feel your pain Dan 😥

[Simon Worrall]

I am very sorry Dan…it was my suggestion that caused you to go down this route.
Simon.

[Dan Osterbery]

Simon please dont apologise! My rage (which has now subsided) was with my supplier not with you, i just hate it when they are not honest with you! Everyone makes mistakes, the professionals amongst us, put our hands in the air and find a solution quickly, not deny, and make excuses. They also charged us for the transport to send the second roll to us, which is what set me off. When we did the pull test the left side did give a lot easier than the right, and cuts have been off at that end, so hopefully that will now be better (running some stickers this morning) so no dramas, really appreciate everyone helping!!!

Cheers

Dan

[Dan Osterbery]

Simon, just cut two sets of stickers and the cuts are mint!! So assemblys needed changing! thank you!

[Stephen Morriss]

Hi Dan

Where did you get the roller assemblies and how much were they?

Mine is a bit weak on the grip at the Head side and I’ve been wondering about changing them?

Steve

[Dan Osterbery]

Hi Steve,
i did, i bought them from digiprint supplies, they are genuine roland parts not copies though! Must add it has made such a difference to print and cut as well, now absolutely spot on! You have to replace left and right at the same time! Right hand end is a bit of a mare to change, but we found away without have to dismantle everything! Let me know when you have got the parts, and ill dig out the photos we took and some instructions.

Good luck

Dan

[Stephen Morriss]

Thanks Dan.

Is this the one?

http://www.digiprint-supplies.com/sp-54 … 01500.html

Quite expensive! But if they need changing then I’d better just get them, mine are very weak and don’t seem to fit the square properly so they can’t be putting the correct pressure on the roll.

I’ve looked and it looks the same and I can see about the pain getting them out, I’d be tempted to bend the old plate to get the old ones off.
Does the stop on the right just unscrew with the one screw at the front?

Steve

[Dan Osterbery]

Hi Steve,
i think that is the middle one? SP-540V Assy, Pinch roller L/R – 22805581 PMEROSP6003 that is the one we bought. You can tell by the camber of the wheels which is left and which is right. http://www.digiprint-supplies.com/sp-54 … 05581.html

cheers

Dan

[Stephen Morriss]

yep I can see that now, I’d forgotten the the middle pinch rollers also had the metal tab as well.

I presume you flip the wheel over for left and right and have to order 2?

Steve

[Dan Osterbery]

we were told order two! one for each end.

[Stephen Morriss]

Ordered 2, I was just being hopeful that there was 2 in the packet for that price 😉

Steve