Re: [PPLetterpress] Windmill Registration Problem
- The register pins are called lay pins or guides, and come in 5 different
lengths. They are still made by Heidelberg and we stock them.
----- Original Message -----
Sent: Monday, October 04, 2004 11:06 PM
Subject: Re: [PPLetterpress] Windmill Registration Problem
> Check the rubber inside the gripper, be sure its clean. If it has been
> with vinyl tape (electrical or bookbinding) which can be and is often done,
> make sure it is
> not sticky.
> Make sure the gripper is properly holding the stock. Bring a sheet into the
> stop it as the gripper enters the press and pull on each side of the sheet to
> sure the bite is even and adequate. . The gripper pressure can also be
> adjusted on each
> individual arm.
> If you are not using register pins on the guides, I suggest you do. The
> guides with
> the flat lip do not always catch the sheet when it is dropped.
> Decurl the stock. If the curl is up it can fall over the guide specially at
> the tail of the
> sheet. Use a longer pin at the rear of the sheet if possible. It also might
> be necessary
> to slightly bend the register pins open so the sheet will not override them.
> Check the bite on each gripper arm. Bring a sheet up with the suckers until
> the gripper
> closes on it. I then draw a line along the gripper edge. Do it to each arm.
> If the bite is
> considerably different between arms, it may be necessary to force them into
> I would not attempt this yourself, but a Heidleberg serviceman with windmill
> usually has a long bar to accomplish this.
> You may be running the press too slow for the momentem of the sheet to reach
> sheet stop. I have found also that is is often necessary to move the stack
> side guide
> about 1/8" to 1/4" further to the right than the adjustment for the brass
> guide stop.
> I have also found that too much speed with certain types of stock, will cause
> the stock
> to bounce back from the front guide, after it is released.
> I currently have three 10 x 15 windmills and they are all different. No two
> run exactly the
> Good luck,
> [Non-text portions of this message have been removed]
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