Linear guides offer precise positioning on paper cutter

Dean Palmer reports on how linear slides are being used on a paper slitting and rewinding machine to precisely position the knife and core

When it comes to paper converting machines, precise positioning of the knife and core are essential. Therefore, the positioning system must be rigid and provide minimum deflection.

Based in Somerset, T.S. Converting manufactures a range of 'Elite Cameron' core cutters and slitting and rewinding machines. For the positioning of the slitting system for paper and medical film, the company uses a linear system from HepcoMotion, the SBM GV3 slide with integral supports, that carries a precision measurement device and laser source. As Rob Snell, design engineer at Elite Cameron explained: "Any deflection in the shaft would be amplified on the position of the laser beam, compromising slitting accuracy. The beam and double row bearings are also robust enough to withstand the rigours of the industry, an operator can even stand or swing on the system with no adverse effect."

According to Snell, as well as giving a high value appearance to the firm's end product, HepcoMotion's linear system also proved to be the most effective option, providing versatility in mounting yet also being strong enough to withstand any misuse.

The slide specified by T.S. Converting is double-edged and its carriage plate, which carries the measuring elements, is moved manually. The load on the carriage is less than 1kg. Although smooth movement is essential, some friction is required to prevent the carriage from over-running and to give the operator some 'feel' for setting the alignment of knives for the slitting process.

For this reason, the linear system bearings were supplied pre-loaded. It was also fitted with cap wipers that not only introduced an element of friction, but also keep the guideway free from ingress of paper dust.

"The V-guide principle central to this system gives us excellent reliability," Snell concluded. "This supported unit was easy to install and has proven to be simple to service." Although the fundamental operation of the knife and core positioning system remains the same, it is packaged by the company to fit different machines. T.S. Converting therefore specifies the HepcoMotion SBM in various sizes to meet these requirements.

Tom Shelley

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