Tool holder for forward and backward planing

摘要

432,691. Planing - machine toolholders. BRUNNER, G., Ebnat - Kappel, Switzerland. Jan. 28, 1935, No. 2715. [Class 83 (iii)] In a double-cutting planing - tool holder the tool b is mounted in a holder a which rocks about horizontal pivots n to relieve the non- cutting edge of the tool and which is also oscillated about its longitudinal axis by the engagement of projections i with abutments k on the holder frame in order to set the tool at the correct clearance angle for each direction of cutting. The tool post includes a support w having lugs m provided with bearings n in which a member d having a vertical bearing e for the holder a is mounted. The tool is secured by screws o. The tool-holder slides on the inner faces of the frame and is provided with mutually inclined flat surfaces p, p1 which coact with stop faces q, q1 within the frame l the face q1 being located on an adjustable cheek c. The upper side of the frame l is provided with four recessed abutment members k which coact with projections i located on opposite sides of a central plane X X. Springs f engaging a ring v tend to maintain the tool-holder in its central position, Fig. 1. In operation, when the tool encounters the work the holder is swung until one of the projections i, Fig. 7, engages its abutment to cause the holder to rotate about its longitudinal axis to give the required tool clearance. In this position the surface p engages squarely with the stop face q1 which provides the abutment for the cutting stroke. On the return stroke the holder is swung so that the surfaces p, q are in engagement and the axial rotation to provide clearance is effected by the engagement of the second projection i with its abutment. By rotating the tool holder through 180‹ by means of the wheel g the projections i are placed so that they coact with the second pair of abutments, and the axial rotations at the ends of the stroke are reversed in direction. The machine can thus be changed from left-hand to right-hand feed without resetting the tool. The toolholder may also be used for planing a vertical surface either on the left, Fig. 12, or on the right.