A sheet post-processing device includes a conveying section that conveys a paper sheet; a punch section that punches punch holes in the paper sheet conveyed by the conveying section; a stacker section that stores the paper sheet in which the punch holes are punched by the punch section; a binding section that binds a paper sheet bundle stored in the stacker section with a binding member; and a controller that controls the above sections. The controller selectively performs a ring binding mode and a direct binding mode. The ring binding mode is a mode in which punch holes are punched in the paper sheet by the punch section and then the binding member is made to penetrate the punch holes for binding. The direct binding mode is a mode in which the binding member is directly driven into the paper sheet bundle without punching the punch holes in the sheet.

A staple includes a crown section including a first curve, a second curve, a third curve, a first straight segment extending between the first curve and the second curve, and a second straight segment extending between the first curve and the third curve. The second curve and the third curve define, respectively, opposite ends of the crown section. The staple includes a pair of leg sections extending from the opposite ends of the crown section.

The present invention relates to a nail assembly having one or more double-pin nails. Each nail includes a nail body and two nail pins extending from the nail body. Each nail pin has a tail end having at least one inclined face formed as a nail edge, where the inclined face is provided with at least one of a concave structure and a convex structure. The concave structure includes one or more grooves, and the convex structure includes one or more tenons. The assembly of double-pin nails having nail pin inclined faces provided with at least one of the concave and convex structures enables, after entering an object, the two nail pins of a double-pin nail are staggered to interlock with each other, thereby effectively connecting the object firmly with a strong anti-pull capability, and having desirable economic and technical benefits.

The disclosure relates to a fastener element for fixating boards to a frame structure, the fastener element comprises: a pair of legs each comprising a first end and a second end, and a head, which extends between the legs and which is connected to the first end of each leg, wherein the head of the fastener element has a straight extension and is ductile to a convex arch-shape which during a fastening operation, for driving of the fastener element into the board and frame structure, is ductile to a convex arch-shape; wherein the convex arch-shape of the head has a curved path along the entire extension of the head, and wherein a distance (d1-dn) between any point (P1-Pn) on the head and the second end of each leg increases during the fastening operation. The disclosure further relates to a tool for driving a fastener element into boards and a frame structure. The disclosure further relates to a fastener system for fastening boards to a frame structure.

An anchoring tool includes a driving member defining a striking axis and a driving actuator configured to actuate the driving member along the striking axis to drive a first fastener into a workpiece. The anchoring tool further includes a bending mechanism having a first deforming member configured to deform the first fastener at least partially out of the striking axis.

A fastener includes an elongated body having a striking end, a middle region, and a tip end region. The striking end and the middle region define a longitudinal axis. The striking end has a first cross-section that is substantially equivalent to a second cross-section of the middle region, and the tip end region includes a tip that is offset relative to the longitudinal axis.

A refill includes: a bottom wall; a first side wall; a second side wall; and a front wall in which a discharge opening is formed. The first side wall includes, in a part thereof in a stacking direction, a first inclined wall extending in a coupling direction of staples and inclined in an axial direction. The second side wall includes, in a part thereof in the stacking direction, a second inclined wall extending in the coupling direction of the staples and inclined in the axial direction. The first inclined wall and the second inclined wall are inclined in the same direction, and at least a part of the first inclined wall and at least a part of the second inclined wall are formed at the same height from a bottom surface of the bottom wall in the stacking direction.

A staple has a pair of legs extending approximately parallel to each other. Base ends of the pair of legs are connected to a crown. The crown has a width greater than a separation distance between the pair of legs. The crown has a planar top surface facing away from the pair of legs.

A refill includes: a bottom wall; a first side wall; a second side wall; and a front wall in which a discharge opening is formed. The first side wall includes, in a part thereof in a stacking direction, a first inclined wall extending in a coupling direction of staples and inclined in an axial direction. The second side wall includes, in a part thereof in the stacking direction, a second inclined wall extending in the coupling direction of the staples and inclined in the axial direction. The first inclined wall and the second inclined wall are inclined in the same direction, and at least a part of the first inclined wall and at least a part of the second inclined wall are formed at the same height from a bottom surface of the bottom wall in the stacking direction.