Offset Printing Mechanism

yes there is a bar with rubber suction cups ,which hold the sheet when the cup pressed on it and it carry the sheet till feeder .that all .

Google is your friend. Get to know him.

I tried to Google but no sufficient inmormation found.

I suggest that you learn how to properly search the internet. Almost everything in the printed world can be found with the proper search technique.

Sheet feed mechanism for offset printing machines and the like ...

Offset Lithography - PrintWiki

Click on the↓ image below to go to the link

The paper is picked up by suction (tube to the plastic cups) lifted, and with a forward motion
(sometimes rotary) of the bar (which holds the cups) the paper is "fed" to the grippers.
Grippers are several small "plier" like clamps which as the name suggests grip the paper edge.

The grippers take (feed) the paper on to the rollers and through the press. It is common
when printing in several colours for the paper to be passed from one bar of grippers
to another bar of grippers for each colour in turn to print. (for the full colour process. CYMK.)

One of the the successes of digital (laser printers) is that they use none of this "feed"
mechanism using instead a friction feed roller to directly insert the paper.
The downside to this very efficient system is some loss in accurately positioning the paper,
critical for full colour printing, and this is overcome (in digital printing) by depositing
all 4 colours on the paper at the same time. This works for the accuracy of the 4 colours
however, while a sharp image is created the whole imposition is not (usually) on the paper
exactly in the same position (on all the sheets) due to the friction feed of the roller varying
the position of each paper sheet by only a few millimetre.

Hope this overly simple explanation is enough, pop along to your local printer?

jt.

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I am looking for the mechanism design of suction lift bar and pile up mechanism.

How about a with the equipment manufacturer?

Can anyone lend me a spoon?

http://yy8128.en.alibaba.com/product/1097521469-213684966/New_Delivery_Gripper_Bar_Assembly_for_font_b_Heidelberg_b_font_GTO_Offset_Printing_Press.html

http://www.alibaba.com/product-gs/386339811/Delivery_gripper_bar_for_heidelberg_SM74/showimage.html

http://www.google.co.uk/imgres?imgurl=http://www.masterworkgraphics.co.uk/UserFiles/Image/MK%25201020%2520E/1020E-Gripper-1.jpg&imgrefurl=http://www.masterworkgraphics.co.uk/shop/cat,MK%25201020/cID,17&h=212&w=290&sz=15&tbnid=g6RtZGnZlFISSM:&tbnh=124&tbnw=169&zoom=1&usg=__bP1E8gZ4UXfCx31NETCUnBBlRmA=&docid=2pV7Ma1zobqsbM&sa=X&ei=ZwZAUtqkC-mw0QWD3ICgBw&ved=0CEwQ9QEwCA

https://www.youtube.com/results?search_query=printing+press+feed+&oq=printing+press+feed+&gs_l=youtube.12...246.11716.0.16608.17.14.0.3.3.0.279.1745.9j2j3.14.0...0.0...1ac.1.11.youtube.CjETlNCPivI

ad infinitum... jt

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