Posted to News on 13th Jun 2008, 10:20
WEISS launches LS280 high-speed linear transfer system
With traditional rotary type assembly systems, the machine cycle time, and therefore the output, is determined by the slowest operation. However, the new WEISS LS280 high-speed linear transfer system enables several assembly operations, with different processing times, to be performed within the same machine, therefore offering the potential to reduce the overall cycle time and maximise the output.
As one of Europe's leading manufacturers of indexing technology, WEISS says it is committed to providing the highest quality engineering combined with the most innovative and practical products for both machine builders and end users. The WEISS LS280, with its simple design and modular construction, enables the assembly system to be easily tailored to suit individual customer and application requirements.
The system comprises assembly modules that use indexing scrolls to transport work carriers through the system. The LS280 concept allows several work carriers to be indexed through the system at the same time, and, with four different indexing pitches available (70, 140, 280 and 560mm), the system can accommodate different assembly or process times without compromising the overall machine cycle time and output.
For example, simple part transfer or assembly operations can be performed with the work carriers indexing through a single pick-and-place station on a 70mm pitch, working on one assembly at a time and achieving a 2.0s cycle. For more complex assembly operations or process operations, the work carriers can be indexed at a longer pitch through multi-tooled stations. These multi-tooled stations can be used to process perhaps two or four parts for each index, thereby providing a longer time to perform the required operation - but still achieving the overall cycle time of 2.0s for each individual part. WEISS says this flexibility allows machine builders or end users to configure the system to provide the optimum process time for each individual operation and still maintain the maximum throughput.
Scroll indexing system
The LS280 is based upon a high-reliability, high-speed indexing drive system, and is capable of achieving exceptionally low cycle times. While conventional linear indexing systems are reaching their limits at 20 cycles per minute (typically having to stop, and raise and lower workpiece pallets), the LS280 is capable of up to 45 smooth indexing cycles per minute using its high-precision scroll indexing system.
WEISS says the modular design of the LS280 also allows each of the individual assembly cells to work autonomously with a buffer between one cell and the next ensuring optimum operation. In addition, the speed of the conveyor belts, which transport the work carriers between the scroll stations, is matched to the sine motion curve of the scroll to ensure smooth and jerk-free operation at all times.
Another benefit from the design of the LS280 is the fact that during the operation of the system no electrostatic charge is generated. This means that the system can be used for applications where ESD capability is a requirement. Further flexibility can be obtained by including automatic and manual stations within the same system, making the LS280 adaptable to a multitude of potential assembly and processing applications.
The design of the LS280 enables maintenance-free three-shift operation due to a combination of hardened and ground bearing tracks and a fully integrated central lubrication system.
WEISS manufacture a complete range of rotary and linear indexing systems, plus fully programmable pick-and-place units, which can be applied to a wide range of automation applications.
For more information on the LS280 linear transfer system and to view an animation, go to www.weiss-gmbh.de/index.php?option=com_content&task=view&id=31&Itemid=51.
