Isaberg Rapid Ab

Isaberg Rapid as

Marcus Borjesson

Mats Andersson

Olle Strååt

Trygrve Gustafsson

A staple-former () in a stapler () that uses a driver blade () to drive staples (), preferably into a sheaf of paper (). The stapler contains a magazine () of staple blanks (). A feed device () advances staple blanks onto an integral bending die () for bending into staple shape. Each staple has a first and a second leg () and a crown portion (). The staple-former () includes first and second leg-bending parts () and crown-forming part (). A staple forms when a drive device (), moves the leg-bending parts () and the crown-forming part over the bending die () causing a staple blank () to assume a staple shape. The staple-former then reciprocates to its starting positions, the staple advances to the driver blade (), and a biasing element () urges the crown-forming part () away from the staple-former ().

Staple-former in a stapler

A clinching mechanism has an anvil composed of first ( ), second ( ) and third ( ) plates arranged in a spaced apart stack with the second plate ( ) positioned between the other two. The plates ( ) are mounted on a housing ( ) so as to be slidable relative thereto and the second plate is also connected to the first and third plates ( ) so as to be slidably movable relative to said first and third plates between a first aligned position in which at least one edge of the first, second and third plates ( ) are aligned to form and anvil face and a second retracted position in which the second plate ( ) is retracted from the anvil face. With the second plate in its aligned position, a staple to be clinched in received with its two legs ( ) on either side of the second plate ( ), the second plate operating to guide the legs ( ) into engagement with associated clinching device ( ) positioned between the first and second, and the second and third plates. Once the staple is located, the second plate ( ) is moved to its retracted position in which it is partially retracted from between the legs. The clinching device are then operated to fold the legs ( ) towards the staple crown and also urge the legs ( ) laterally towards each other, the retraction of the second plate ( ) permitting the legs ( ) to be clinched into close alignment with each other.

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Hestra, Sweden

Marcus Borjesson