| 摘要 |
1,094,030. Sawing. CONTINENTAL MACHINES Inc. Nov. 10, 1966 [Feb. 11, 1966], No. 50390/66. Addition to 1,068,200. Heading B5L. A band saw machine comprises an endless flexible ribbon-like saw band 11, Fig. 1, saw guide means 70, 71 engaging spaced side portions of the band to define a cutting zone, a substantially flat backer band 60 having a thickness no greater than the front cutting edge of the blade mounted coplanar with the blade and with an edge abutting the back edge of the blade to reinforce the cutting zone against edgewise deflection, one of the abutting edges of the band and saw being provided with a shallow lengthwise extending groove 61 in which the other abutting edge is guidingly received to keep the saw band from slipping laterally off the edge of the backer band. The upper saw guide means 70 may be vertically adjustable on a post 72 to vary the extent of the cutting zone of the saw blade. The backer band extends between a portion 63 of the frame of the machine and a member 65 carried by a rod 66 acted upon by a spring 68 and nut 69 to tension the backer band. The groove 61 is preferably formed in the edge of the backer band and has a shallow V-shape or concave shape, and the edge of the saw band 11 is either shaped to match the groove or flat. The edge of the backer band may be hardened. In an arrangement in which the initial cutting action takes place on a narrow section, Fig. 4, a starting guide 75 and a further starting guide 76 in the form of jaws which clamp on to the backer band 60 and retains the saw band coplanar with the backer band. The backer band in the machines shown in Figs. 1 to 6, in which the saw band is twisted, and Figs. 11 to 14 of the parent Specification may be provided with a groove in its edge abutting the back edge of the saw band. |
