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In The Loop

Vamatex S.p.A. positions the new Leonardo DynaTerry as successor to SP1151ES.

Jim Phillips

  Vamatex S.p.A. positions the new Leonardo DynaTerry as succesor to SP1151ES. Enhancement of the production process the ability to more meticulously control each element of production for the sake of both profitability and productivity takes many avenues in the worlds textile industry. 

Many are the plants in which shuttle looms are still the standard equipment, although these are becoming fewer in number with each passing day, even in the more remote corners of the globe. These machines progressively become more expensive to run in terms of productivity, quality, labor and maintenance costs. Still relatively rare, as well, are those plants that have the very latest technological marvels as machinery on the absolute cutting edge is usually unproven in a production environment. Most of these machines currently up and running in plants are in trial operation.So, its not surprising that many of the advancements in technology that offer immediate benefits to textile plants encompass improvements of existing technology enhancements that increase productivity, quality and efficiency, while reducing labor, power and maintenance costs.In this issue, ATI looks at two such weaving machines manufactured for terry weaving. In this report, the focus is the Leonardo DynaTerry from Vamatex S.p.A. In the following report, a European installation of the Sulzer G6200 F is reviewed. New Machine Means QualityThis past September, the doors of Vamatex in Villa di Serio, Bergamo, Italy, were opened to a host of European mill representatives and writers for the unveiling of a new machine the latest incarnation in the companys three-year-old Leonardo line. This series has appeared in multiple sectors of the industry, and has garnered a reputation for quality, productivity and low-cost maintenance. First launched in 1997 and sold since 1998, more than 4,000 of the Leonardo series machines have been installed worldwide.The new Leonardo DynaTerry is the successor to the popular Vamatex SP1151ES weaving machine, which, according to the company, accounts for 70 percent of the world market for rapier weaving machines in the terry sector. 
Quality terry cloth has to do more than just dry well, said Riccardo Mautino, communications manager for Vamatex. It must envelop, caress, and be soft and gentle to the skin. To produce really special terry, we have developed the Leonardo DynaTerry the result of a genial design that combines the unmatched quality of rapier looms with exceptional productivity, and merges versatility with reliability and a thoroughly demonstrated operating economy.Weft-insertion levels for the Leonardo DynaTerry exceed 1,350 meters per minute, Mautino said. The superior quality of the terry cloth produced on the loom is the result of perfect, continuous control of the tension of two different warps, he said. This tension control is achieved with electronic fabric let-off and take-up powered by electronic controls a technological trick necessary for obtaining the best weft density and the most timely tension correction during the loop formation process, he said.Rapiers are popular in the production of terry cloth because of the flexibility they offer for production, Mautino said. The Leonardo DynaTerry is lightweight and small-sized, yet very rugged and reliable, he said. It allows the weaving of the most diverse and difficult yarns those characteristic of the most recent fashion trends in the terry sector with precision and reliability. One can tackle even the most imaginative borders without the slightest reservation, and with little or no productivity loss. New Features And ControlsAmong the new features of the weaving machine, according to Vamatex, is the electronically controlled loop-formation system. This new system allows for changing the pile height by simply inputting the settings on the integrated keyboard.The Propeller ribbon and rapier drive system are the real heart of the Leonardo DynaTerry. The Propeller consists of two coupled devices: the connecting rod-crank unit and the variable pitch screw-nutscrew unit. This, says Mautino, ensures optimal rapier speed and acceleration, and enables maximum operating performance.In addition, the structural simplicity of the units, combined with high structural strength and reduced dynamic mass, allows for stable, reliable motion, even at high speeds, he said. These factors contribute to low energy consumption, low noise level and low maintenance requirements. A slow-motion, pick-finding device, integrated into the rear of the left-hand drive unit, uses a pair of electromagnetic drive couplings. This device helps the Leonardo DynaTerry withstand heavy work loads. In the jacquard version, the Cardan-drive bevel transmission is put into motion directly by a drive unit without a transmission belt, which, according to Vamatex, ensures perfect transmission under any load conditions.The Leonardo DynaTerry has two sley-drive units on narrow machines and three on wide versions. These are positioned in the main cross bar and connected by shafts to produce, according to Mautino, a constant, powerful and reliable motion.The temple supports are installed on moving sleds, in phase with fabric motion, to support the loop formation, which avoids loosening of the yarn and, according to Mautino, assures consistent quality over the entire width of the fabric. A practical droplifter system reduces warp-yarn rubbing during loop formation, improving both the overall efficiency of the machine and consistent pile height.The Vamatex machine features several new features in control systems, according to the company. The brain governing the Leonardo has been designed using the concept of shared intelligence, the innovative systems architecture now found in state-of-the-art technology in the automation field, Mautino said. Every single action of the various parts of the machine is coordinated and optimized according to data that is collected and then shared between the devices.The control system is based on a CAN-BUS, first designed for applications in automotive and aerospace applications. The CAN-BUS was developed to facilitate communication speed and data transmission in environments where a large number of actuators is employed. The Vamatex controller, called the Fulltronic, uses this technology to instantly coordinate all loom functions, including operating conditions, heald movements, color selection, warp tension and weft density. Additionally, the system monitors the status of the lubrication circuit, current operating mode of all devices, output speeds and all statistics relative to the overall performance of the machine. Monitoring takes place at a frequency of more than 700 messages per second, which offers continuous real-time check-up. The Fulltronic system can be programmed through its console and can be immediately interfaced with computerized detection systems to send and receive production data on-line.The Leonardo DynaTerry is capable of up to 520 picks per minute and can process four, eight or 12 colors in any order. 
Vamatex representatives Nikolaos Perackis, Miro Radici and Riccardo Mautino stand before the Leonardo DynaTerry during the loom's introduction in Bergamo, Italy.

February 2001