Band saw blade

#The invention concerns a band saw blade with teeth having a tooth point with a tooth edge, a tooth face on the front side of the tooth as viewed in the direction of sawing, a tooth back behind the tooth edge, and a tooth bottom between the tooth face on each tooth and the tooth back on the next tooth in front of said each tooth, and tooth gullets, wherein a tooth gullet is defined as the space between the tooth edges of two adjacent teeth, said saw blade having two planar sides; a right hand side and a left hand side when the saw blade is viewed obliquely from above in the direction of sawing, wherein said tooth edge extends between a right hand tooth corner and a left hand tooth corner with reference to said viewing direction.

#Saw teeth of band saw blade work as tiny planing tools generating chips at high speed by planing and/or tearing, the chips being collected and removed in the tooth gullets. The development of increasingly efficient band saws has aimed at further developing this planing and/or tearing function of band saw blades. It is a typical feature of band saw blades that the teeth are set or swaged, so that the kerf will be somewhat wider than the blade is thick. The kerf is formed due to their milling away material.

#It is also typical for band saw blades that they vibrate and give rise to noise at a volume which in many cases can be uncomfortably high. Further, the surfaces of the kerfs will be grooved or otherwise uneven, which requires considerable finishing in those cases when smooth surfaces are desired. Among other drawbacks can be mentioned that setting and swaging cause wide kerfs and hence substantial losses of material.

#In the following description, reference will be made to the accompanying drawings, in which:

#FIGS. 1A, 1B, show a section of a band saw blade according to the first preferred, and

#FIGS. 1C and 1D tested embodiment in a perspective view, from the side, in a vertical cross-section view and in a horisontal cross-section view, respectively,

#In the drawings, the saw blade has been shown with strongly exaggerated thickness.

#With reference first to FIGS. 1A and 1B, there is shown a section of a band saw blade 1 according to an embodiment which, when sawing in wood, plastics, fresh victuals and in comparatively soft metals, such as brass, has turned out to give very good results, as has been mentioned in the foregoing. The sawing direction is shown by an arrow 2. The blade thickness (gauge) is strongly exaggerated. A first tooth is designated T1 and second teeth on each side of the first tooth have been designated T2. The tooth edges at the tip of the tooth points of the teeth T1 and T2 have been designated E1 and E2, respectively. The tooth edge E1 on the first tooth T1 extends over the saw blade 1 between a right hand tooth corner A1 and a left hand tooth corner B1, while the tooth edges E2 extend between a right hand tooth corner A2 and a left hand tooth corner B2. The right planar side of the blade 1, which is hidden in FIGS. 1A and 1B, is denoted R, while the opposite, left hand planar side, turned towards the viewer, is designated L. A first tooth gullet between the tooth edge A1 and the tooth edge A2 in front thereof has been designated G1, while the tooth gullets in front of and at the rear of said tooth gullet G1 have been designated G2. A tooth face on the first tooth T1 in the tooth gullet G1 is designated F1. A tooth back on the tooth T2 in front thereof in the tooth gullet G1 is designated H1, while the tooth bottom in tooth gullet G1 is designated J1. Corresponding details in the tooth gullets G2 are designated F2, H2, and J2, respectively. The tooth face F1 is concave and it first extends downwards-rearwards from the edge E1, forming a hook angle α of approximately 5° (see FIG. 1B) whereafter it turns forwards towards the tooth bottom J1. The tooth back H1 extends convexly upwards from the tooth bottom J1 towards the tooth edge E2 on the tooth T2 in front thereof.

#According to the embodiment shown in FIGS. 1A-1D, the saw blade is bevelled in the region of the entire tooth gullet G1 in such a mode that the bevelled saw blade surface S1 will slope towards the left hand side L of the saw blade forming an angle β of about 5° (see FIG. 1C) with said left side, which means that the bevelled region with said sloping surface S1 will extend from the first tooth edge E1 in the rear end of the first tooth gullet G1, down the tooth face F1 and up the tooth back H1 all the way to the tooth edge E2 on the next tooth T2 in front of the first tooth. The bevelled region S1 is bordered to the right by a first line K1, which extends from the right hand tooth corner A1 of the tooth T1 to the right hand tooth corner A2 on the next tooth T2 in front of the first tooth T1. The line K1 coincides with the plane of the right hand planar side R of the blade and forms an edge line of a first longitudinal edge X1, the edge angle β (see FIG. 1C) of which according the embodiment is about 5°. The said first longitudinal edge X1 thus has the shape of a longitudinal knife edge in the region of the entire tooth gullet G1 with an edge line K1, which follows the profile of the tooth gullet. The bevelled first region S1, which forms one side of the knife edge X1, is bordered to the left by the border line against the left hand side L of the blade, while the second knife edge side coincides with the plane of the right hand side R of the saw bade.