QM 46-4 Di. Plate advances too far

[Deadspread4]

I run a QM 46-4 DI. Today I was in the process of burning plates when my #4 unit abruptly ran out. According to my computer I had 10 plates left on the unit, so it should have been no where close to out. When I pulled out the used roll of material I was shocked to see that the press was advancing about half a plate length too far on each burn. I had huge spans of unused plate material between each job, instead of the usual inch or so gap. I am aware that there is a setting in the computer or in the command that controls the distance of advancements. To my knowledge all other units are functioning properly. I was curious if anyone could help me out on this issue, so that I don't waste another $100 of plates on this roll.

 

[maverick1971]

Hi,

Just had the exact same problem on my DI. Problem is not computer setting - clutch inside plate roll cylinder needs to be adjusted. Inside plate cylinder there are 2 gears (DS). The gears each have an llen key screw in their center. The gear which meshes with the new roll needs adjustment. Turning the screw clockwise increases tension on the roll and reduces the amount of plate material advanced. Turning anti-clockwise reduces the tension and increases the amount of plate material that is advanced.

You need to measure the force required to cause the roll to slip in order to set the clutch. Insert a new plate roll or one with a new tongue cut out. Attach a spring balance to the end of the roll and with the gear released, pull on the spring balance checking the force required befor the plate roll slips. Force should be around 2,5 to 3 Kg (not sure what the conversion to lbs is). You will need to measure and adjust the screw accordingly - you may have to insert and remove the roll a few times. Do not over tighten the screw - clutch will be too tight and plate will not advance enough resulting in your old job not completely winding off before your next burn. Gap should ideally be 80 - 100mm according to Heidelberg tech.

Hope this helps - please advise.

Regards - Maverick