It also has the least risk of tearing the pages in heavy use, as the pressure is shared between four ‘weak’ areas rather than two or three. This form of fitting, keeps all the pages in line. Three rings also prevent the transfer of pages to and from other binders, since most will be two or four rings. Three ring mechanisms are mostly used when the binder contains pages going to or from the United States – nearly all loose-leaf supplies in the USA are based on three rings. They are not suitable for heavy use since the pages are more likely to tear out. Two ring mechanisms are the most economic and also the most suitable for use when simple additions to the binder are envisaged (most offices use a two hole punch). The spine size is how much space it takes up on the shelf.The capacity is how much the binder can hold. This spacing can also be referred to as the hole punch spacing.Ī ring binder’s capacity can easily get confused with the size of the spine which is larger to fit round the mechanism. The ring spacing is the distance between the rings of the mechanism with various standards utilised across the wide range of mechanisms available.We measure the capacity based on the gap between the mechanism base plate and the usable vertical length of the ring before it curves around at the top.Two key measurements of any mechanism are its capacity and ring spacing, measured in millimetres. This style of mechanism is often favoured by legal and account firms or departments due to the increased capacity as well as its ease of use. Like the D-ring it has a flat edge providing the same benefits. This style of mechanism is often supplied with a compressor bar that allows the document stack to be clipped securely to minimise movement. The lever action allows it to be opened and closed easily allowing for quick and easy organisation of your contents. Lever arch mechanisms are fitted into the back cover of the binder. Any print or pockets on the spine will have to be designed to avoid the rivets. This type of mechanism is best suited for easel binders as its spine fixing location allows the pages to turn easily. The O-ring or round mechanism, named because of its O like shape, is usually fitted into the spine of the ring binder. This shape of ring is suitable for the majority of ring binders archiving, presentation, display books, handbooks, training manuals, reference materials, student notes and more. This also allows the front cover to be opened and closed without moving your documents, as found when using the O-ring, minimising any pull and tear along the punch holes of your contents. The mechanism is fitted into the back cover, with the rivets less noticeable and keeping the spine clear for artwork and print. The D-ring named as it is shaped like a backwards ‘D’ is by far the most popular shape of mechanism we supply, with the flat edge keeping your paperwork in a neat flush stack. As a specialist supplier however, if there is a mechanism you require our sales team is more than happy to help discuss your needs further. For simplicity, we’ve only included the three most commonly used mechanisms. In this article, we’ll break down: what the different mechanisms look like, what they’re best used for and how they’re sized. At Duraweld, we use three different mechanisms when it comes to our ring binders: D Ring, O Ring and Lever Arch.
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