Springs keep the tills ringing
Cash tills are in constant use in stores around the world and checkout operators demand that they operate reliably and smoothly. Most cash tills use a spring to perform the opening and closing operation of the cash drawer and one till manufacturer was experiencing problems with the closing operation, with failures occurring after 200,000 to 300,000 operations.
These failures were very inconvenient and the till manufacturer needed to find a fast and reliable solution. So engineers from the company approached specialist spring manufacturer William Hughes to see what could be done to modify the existing design. The aim was to improve the operation and feel of the till action, while significantly extending the operational life up to a target of 1,000,000 operations.
The engineers at William Hughes have extensive knowledge of spring design and alternative materials and they proposed an improved design featuring a double torsion spring with opened up coils to reduce friction and stress. To further improve the action, all the burrs and sharp edges on the spring were removed during manufacture, and a special lubricant was lightly applied. The William Hughes design also incorporated an ancillary spring to give failsafe operation.
Prototypes were quickly produced and tested by the till manufacturer and found to exceed its demanding requirements. Following their acceptance, bulk supplies are now being supplied to meet production demands. William Hughes has been making springs for over 200 years and specialises in problem solving for its customers. The company has the technical resources to help its customers design and manufacture a range of springs and bent wire components, as well as helping to solve a wide range of engineering and design challenges.
A rapid design and prototyping service is available for wire products including springs and bent wire components. Quality systems to ISO 9002 and compliance with TS16949 ensure consistency and accuracy of supply and by investing in the latest CNC machines and quality procedures, William Hughes assures continuity of supply.
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