Heidelberg CD74 - how to align slat on cylinder plate?

Hello my friends. How to align (mechanically) the slat on a cylinder plate (grip side) on CD74? Do I need some specific key or instrument? Have you any idea? Best Regards Sebastian

 

What do you mean by "Slat"? Do you mean "punch pin" on plate clamp?

 

yes

 

Basically they are adjusted in the factory and you have to write down these adjustments before taking apart the clamp. There are instructions in service manual but I recommend you to ask a mechanic for this job.

 

Ill list the procedure that ive used for this... you first want to square off your headstop adjustments, so that the presses gripper bite is centered and at factory spec. Sheet compensator should be zeroed if so equipped. This procedure may require the moving of individual headstops. Once you know the sheets are entering the press square, then its a matter of making sure all your units are printing to the same length, and with correct pressures between both plate to blanket, and blanket to impression cylinder. Ive outlined this procedure before on this forum. I would then have prepress image a fine line grid plate to the presses maximum sheet size. You could use a single plate and just move down the press from unit to unit, or you could image multiple plates, with one for each unit. No need for color bars, but center marks in both directions for the max sheet size would be required. It would also smart to be sure your paper is both square and measures to the correct size, with nominal accuracy within 1mm. I then like to be sure that all of the spring loaded indexing pins on each units plate cylinder drive gear are set to the proper gripper margin and that pins are properly engaged. Also be sure that all of the running registers on each unit are centered to include plate cocking if so equipped. At this point you would hang the grid plate on the presses first printing unit, and run a few sheets,getting the press up to full production speed. Fan out a few printed sheets to be sure the press is side guiding and printing with no headstop bounce. At this point you will register your 1st unit plate to the sheet in all 3 directions, making ALL register moves using ONLY your plate clamp. Time spent getting this perfect will show the obvious benefit, as all subsequent units will be registered the same way to this standard. Once you have the first unit registered perfect in all 3 directions then its just a matter of turning your plate clamps indexing bolts in until they just touch the plate cylinders landing pad. When moving your plate clamp be sure that you use only the outside plate clamp bolts, with the inner bolts backed off enough to not make contact ,and obstruct your clamps movement. Time spent doing this perfectly will be rewarded. Once the indexing bolts have made correct contact then its a matter of tightening up the bolts jam nut, to lock it into position. Once your locked into position on the first unit double check your work by running a few more sheets at full production speed. If you've registered your first unit correctly then its just a matter of going down the line, unit by unit, registering each unit the same way to the first unit. If your press is equipped with a perfector any adjustments here should only be carried out AFTER you register everything in straight printing mode. These perfector calibrations should be made at the perfector itself without disturbing any plate clamp positions after the perfector. Try to schedule a time to do this when your not rushed, as the time spent getting this perfect will reduce makeready times on every single multicolor job.