Heidelberg 2005 Heidelberg 74- 2 colour

[junker1984]

Not if it’s the issue I’m assuming. Very labor intensive, no short cut. 4-6 hrs for a pro, + parts.

 

[junker1984]

Try to find the pin/bushing and see if there’s a grease point on the face of the outer gear. Spray penetrant into pin/bush and if the cup grease point is there, lube accordingly. Maybe help or resolve?

 

[Alistair Tinsley]

Hello again.
On closer inspection of the problem area I noticed that the servo motor had become quite loose so tighten.Cannot see how that would have caused problem though so not hopeful.
I did notice though that on the run this morning that the plate had moved a fraction.
So going to keep an eye on this.
Is there a way of putting more pressure on clamp?
I am not the operator so can never get time to stay with machine as a factory to see to and so many moaners lol.
Thanks for your help
A

 

[junker1984]

Clamping pressure is predetermined by air bladder inflation and many internal components put in motion by that action. Many years since I've been into a 74 clamp, and without seeing one, I can't say if you can remove front clamp bar for examination/cleaning of the gripping surfaces without disturbing critical tolerances. Anyone?

 

[junker1984]

Dawned on me that, yes, removal of front clamp bar requires critical repositioning tolerances.

 

[Alistair Tinsley]

Okay.
Thanks for that

 

[Alistair Tinsley]

Hi Junker.
It seems plate is slipping on the gripper.
There are Allen screws you can tighten along the gripper which closes the gap.
Is this the method of tighting grip on the plate and is there any particular percedure?.
Thank you
Alistair

 

[Jack liston]

I don't think the Allen on 74 will tighten grip . Two people required to remove plate clamp assembly
You also need to lock clamp in place with special Allen bolt before removing clamp dozen of spring underneath.you would need to study video.or schematic thoroughly.care on this one

 

[junker1984]

Agreed, jack. In my days of running service, I recall a number of times that in the course of repairs, I found moisture from fount solution and wash up had migrated extensively down into clamp mechanism and thoroughly rusted components where they did not move freely. I might suggest, without having tried this, to spray a penetrant down into clamp and let sit over the weekend with clamps facing upward, but you'll be slinging oil for days afterward.

 

[Alistair Tinsley]

Okay
Thanks guys.
Will take advice on board.

 

[Jack liston]

Aliister You must use plastic safe penetrant or you can damage plastic bladder.be careful

 

[Alistair Tinsley]

okay.
Anyone know if there are videos and links on it.
Thank you

 

[junker1984]

This is not a proven procedure. It’s off the top of my head, as I’d mentioned in my post.

 

[Alistair Tinsley]

Hi Junker.
Excuse my ignorants as I am still learning about the PM 74.
When you put a plate in machine you use manual lever both ends.
When does the air force (bladder) be activated?
Is this on both ends, front and back of the plate.
Thank you
Alistair

 

[junker1984]

I'm surprised to hear of manual plate clamping in a 74, guess I never worked on any "Printmaster" versions of the machine, that being g the less automated version. My mistake in assuming your machine had the pneumatic clamping mechanism. Sorry a out the confusion.

 

[Steve F]

I'm very surprised that a 2005 PM74 doesn't have EasyPlate Clamping system on it.

On the EasyPlate system the front and rear plate clamps are spring loaded closed, and pressing the console button activates the bladder (the front and back edge clamps have their own bladder) which forces against the springs to open the clamp up, and then pressing it again deflates the bladder and the springs now force the clamp shut again. So the springs and the bladder together, do what we used to with a lever, back in the day...

If there is a leak in the bladder you will hear a slight air leak when the clamp is open.
A bladder that leaks but still opens the clamp is as good as a bladder that doesn't leak, until it doesn't open the clamp and you can't mount/dismount a plate!
I've been running with a leak for aprox 6 months on a rear plate edge clamp. During production the bladder does nothing.

To satisfy my curiosity, I'd check the operation of the circumferential register motors. I'm guessing you're using CP2000, so on the main console, register page, select both units and move them both to their extremes. As they are moving the figures will go white showing that they are moving, then turn black once they are in the correct position. Both units should turn black at approx the same time. If one unit is taking quite a bit longer you've got a sticky motor. (It's good practice every couple of months to move all registration motors to their extremes as it keeps the spindles clean and just gives them a bit of a workout!)
When you're having this problem are the figures on the register screen still black or is the bad unit figure turning white?
Could it be a dodgy connection to the register motor, disconnect/reconnect?

Frustratingly, at a previous work place there was a 5 col SM74 that had this exact problem, however, I didn't run that press so I haven't a clue how they sorted it :-( but it did get sorted.

I think if a plate was slipping out of the front clamp you'd have greater worries.
To see if it is slipping in the clamp though, during a run when you've had to alter the register to keep it in the correct position, stop the press, dismount the plate, remount it, and see if you have to move the register back to where you had it at the start of production.

Steve

 

[Alistair Tinsley]

I'm surprised to hear of manual plate clamping in a 74, guess I never worked on any "Printmaster" versions of the machine, that being g the less automated version. My mistake in assuming your machine had the pneumatic clamping mechanism. Sorry a out the confusion.

 

[Alistair Tinsley]

Hi Junker.
Does the manual opening still have the bladder?
Regards
A

 

[junker1984]

If the clamps are manually operated, there would be no bladder.

 

[Alistair Tinsley]

I'm very surprised that a 2005 PM74 doesn't have EasyPlate Clamping system on it.

On the EasyPlate system the front and rear plate clamps are spring loaded closed, and pressing the console button activates the bladder (the front and back edge clamps have their own bladder) which forces against the springs to open the clamp up, and then pressing it again deflates the bladder and the springs now force the clamp shut again. So the springs and the bladder together, do what we used to with a lever, back in the day...

If there is a leak in the bladder you will hear a slight air leak when the clamp is open.
A bladder that leaks but still opens the clamp is as good as a bladder that doesn't leak, until it doesn't open the clamp and you can't mount/dismount a plate!
I've been running with a leak for aprox 6 months on a rear plate edge clamp. During production the bladder does nothing.

To satisfy my curiosity, I'd check the operation of the circumferential register motors. I'm guessing you're using CP2000, so on the main console, register page, select both units and move them both to their extremes. As they are moving the figures will go white showing that they are moving, then turn black once they are in the correct position. Both units should turn black at approx the same time. If one unit is taking quite a bit longer you've got a sticky motor. (It's good practice every couple of months to move all registration motors to their extremes as it keeps the spindles clean and just gives them a bit of a workout!)
When you're having this problem are the figures on the register screen still black or is the bad unit figure turning white?
Could it be a dodgy connection to the register motor, disconnect/reconnect?

Frustratingly, at a previous work place there was a 5 col SM74 that had this exact problem, however, I didn't run that press so I haven't a clue how they sorted it :-( but it did get sorted.

I think if a plate was slipping out of the front clamp you'd have greater worries.
To see if it is slipping in the clamp though, during a run when you've had to alter the register to keep it in the correct position, stop the press, dismount the plate, remount it, and see if you have to move the register back to where you had it at the start of production.

Steve

Hi Steve.
But I can see clearly that the plate moves in the clamp after x amount of sheets.
The problem surely has nothing to do with the register motors.
Regards
A

If the clamps are manually operated, there would be no bladder.

If the clamps are manually operated, there would be no bladder.