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Heidelberg Introduces Improved Delivery on the Speedmaster CD 74 for Even Higher Productivity
The dynamic sheet distance control which has so far only been available on long perfecting presses is now also available for shorter perfectors. This provides for mark-free sheet travel to the delivery. An ultrasonic sensor after the final printing unit measures the distance between the sheet and the guiding devices. It uses predefined characteristic curves to control the air which ensures that no contact occurs. This process is fully automatic for the various paper grammages and cuts make-ready times.
A number of key components have been added to the Smart Sheet Travel concept to ensure reliable and mark-free sheet travel. As of October 2006, the new dynamic sheet brake will come as standard on the Speedmaster CD 74 in combination with the optional speed of 18,000 sheets per hour and can be ordered as an option for perfecting presses and straight-printing presses with speeds of 15,000 sheets per hour. The new air system in the delivery will be standard on all Speedmaster CD 74 presses as of October 2006. In addition, the standard package for all long perfectors with eight or more printing units will include the dynamic sheet distance control and it will also be optionally available for shorter perfecting presses from October 2006.
"We process a wide range of jobs and print runs from 100 to 300,000 sheets, so we opted for a Speedmaster CD 74 five-color press with the speed of 18,000 sheets per hour. The new suction head in the feeder and the new dynamic sheet brake in the delivery enabled us to boost our average print speed by between 2,000 and 3,000 sheets per hour, particularly with thinner papers," says Axel Zimmer of Zimmer Print + Medien. "The stable speed of 18,000 sheets per hour is crucial for cost-effective pro-duction, particularly when it comes to long print runs," adds Zimmer. The print shop, located near Paderborn, Germany, has nine employees. Cologne-based print shop Häuser, a full-service commercial print shop with a staff of 38, reports similar increases in productivity. "We were one of the first print shops to test the new dynamic sheet brake in a Speedmaster CD 74 eight-color perfector. We have increased our production speed for critical paper grades by up to 2,000 sheets per hour," reports Heiko Mazur, owner and CEO of Häuser. His business model is based increasingly on an Internet sales platform that demands high quality and the fastest possible delivery times for print jobs.
The art of clean sheet transport
The key to the new drive concept is a dynamic and therefore exactly-defined braking process. Rather than the sheet brake having a consistent speed, as was the case previously, the dynamic brake supports changes of speed while one sheet passes. The sheet is transferred to the brakes almost completely without any speed differen-tial, slowed down to an adjustable speed and then deposited in the delivery. A no-play drive train with up to six sheet brakes ensures a mechanically stable and rigid system. The brake modules can be adjusted vertically and laterally, meaning a wide range of printing stocks can be processed and effective sheet tensioning achieved. Depending on the print product, the sheet brakes can be inserted and removed in just a few steps.
All Speedmaster CD 74 models are to incorporate the drive concept with new brake, but without dynamic features, as standard from the start of 2007 onward. The braking speed is then set to a fixed value.
Speedmaster CD 74 - a real all-rounder
The Speedmaster CD 74 was introduced at drupa 2000. Since drupa 2004, the press has also been available with a perfecting device and, since summer 2005, as a long perfecting press with up to 12 printing units. It is the high productivity, flexibility and large scope of application offered by the Speedmaster CD 74 that customers rate so highly. A ten-color press with a coating unit before and after sheet reversal was presented at Ipex 2006. It enables customers to boost productivity by 30 percent, as the printed sheet reaches the finishing stage much faster. At Ipex 06, the Speedmaster CD 74 also showed that it runs at a maximum speed of 18,000 sheets per hour.
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