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A buckle for tightening or loosening a band, including: a buckle body having a pair of hinge holes; a plate spring arranged in the buckle body with a leading part positioned in a sliding path of the band, the leading part being shaped to slope with a leading end contacting a back side of the band so

A buckle for tightening or loosening a band, including: a buckle body having a pair of hinge holes; a plate spring arranged in the buckle body with a leading part positioned in a sliding path of the band, the leading part being shaped to slope with a leading end contacting a back side of the band so as to be caught by a catch projection of the band; and a buckle switch having a pivot pressure piece with hinge projections, and an operation lever connected to a pivot pressure piece so as to be exposed to one side of the buckle body. The leading end of the plate spring is separated from the band so as to make the band slide in a loosening direction when the plate spring is pressed by the pivot pressure piece.

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1. A buckle for tightening or loosening a band with a back side having at least one catch projections formed widthwise, the buckle comprising: a buckle body having an insertion hole and an exit hole for slidingly passing the band, and a pair of hinge holes formed across a sliding path of the band;a

1. A buckle for tightening or loosening a band with a back side having at least one catch projections formed widthwise, the buckle comprising: a buckle body having an insertion hole and an exit hole for slidingly passing the band, and a pair of hinge holes formed across a sliding path of the band;a plate spring arranged in the buckle body with a leading part positioned in the sliding path of the band, the leading part being shaped to slope with a leading end contacting the back side of the band by an elastic force of the plate spring so as to be caught by the at least one catch projections of the band when pulling or pushing the band toward a loosening direction and thus to control a slide of the band; anda buckle switch having a pivot pressure piece with hinge projections at both ends inserted in the pair of hinge holes so as to be hinged to the buckle body and positioned between the band and the plate spring, and an operation lever connected to the pivot pressure piece so as to be exposed to one side of the buckle body and configured to be rotated by a user,wherein the pivot pressure piece is configured to rotate and press the plate spring against the elastic force of the plate spring by a rotation of the operation lever,wherein, when the plate spring is pressed by the pivot pressure piece, the leading end of the plate spring is separated from the band so as to make the band slide in the loosening direction, andwherein, when the plate spring is not pressed by the pivot pressure piece, the leading end of the plate spring catches the at least one catch projections of the band by the elastic force of the plate spring. 2. The buckle of claim 1, wherein the pivot pressure piece is tilted in the same direction as a tilted direction of the plate spring, the leading part is positioned on the sliding path of the band, and thus if the band is pulled or pushed in the loosening direction, the leading part of the pivot pressure piece along with the leading part of the plate spring are caught on the at least one catch projections of the band so that the slide of the band is controlled. 3. The buckle of claim 1, wherein the plate spring is mounted on the buckle body as a separate part or is integrally formed with the buckle body. 4. The buckle of claim 1, wherein the plate spring is formed by folding a part of the buckle body. 5. The buckle of claim 1, wherein the leading part of the plate spring comprises: a first slope part which is caught on the at least one catch projections as the first slope part gets tilted toward a distal end of the first slope part to be close to the band;a second slope part which is extended from the distal end of the first slope part and have a gradient lower than a gradient of the first slope part; anda third slope part which is extended from a distal end of the second slope part to have a gradient larger than the gradient of the second slope part,wherein a projection is formed between the second slope part and the third slope part and the projection is pressured by a rotation of the pivot pressure piece. 6. The buckle of claim 5, wherein, in the plate spring, a concave part, which is concave in a direction opposite to a tilted direction of the leading part of the plate spring, is formed at a distal end of the third slope part, and wherein the pivot pressure piece is hinge-jointed to the buckle body to be positioned at the concave part. 7. The buckle of claim 1, wherein the buckle body is formed by bending a metal plate, wherein an opening is formed on the buckle body by a cut piece which is cut in a form that divides each hinge hole, andwherein, if the pivot pressure piece is inserted into the buckle body through the opening and then the opening is closed with the cut piece, the pivot pressure piece is hinge-jointed to the each hinge hole. 8. The buckle of claim 1, wherein the buckle body is injection-molded, wherein an opening for inserting the pivot pressure piece into the buckle body is extended, and a pair of V-shaped projections facing each other are formed between each hinge hole and the opening,wherein a notch corresponding to the V-shaped projections is formed at the end of the pivot pressure piece,wherein, if the pivot pressure piece is inserted into the buckle body by arranging the V-shaped projections and the notch, the pivot pressure piece is elastically supported by the plate spring and is rotated with a slope, andwherein hinge projections are moved from the each hinge hole to the opening by the V-shaped projections.