Patent GB-897784-A (GB)
Title: Tool grinder
IPC: B24B3/34
Filed: 1959-02-26
Abstract: 897,784. Tool grinders. DE VLIEG MACHINE CO. Feb. 26, 1959 [April 14, 1958], No. 6731/59. Class 60. A tool grinder for grinding arcuate cutting edges about a pivot axis includes a base, a supporting member pivotally carried by the base, a tool inclination adjusting member carried by the supporting member and arcuately movable about an axis intersecting the pivot axis of the supporting member at right-angles thereto, a tool-holding fixture carried by the tool inclination adjusting member adapted to hold a tool with its cutting edge in the vicinity of the point of intersection of the axes, means for supporting a grinding wheel with its grinding face adjacent the point of intersection of the axes, and feed means for advancing the tool-holding fixture relative to the point of intersection of the axes and at rightangles to the axis about which the tool inclination adjusting member is movable. A machine comprises a stand 1 serving as a storage compartment for coolant tanks and having a panel 2 with switches 3 for controlling electric motors of the machine. A base member 4 is secured to the top of the stand 1 by screws 5. Supporting, positioning, reciprocating and driving the grinding wheel 8. A pair of parallel, horizontal, transversely extending guide bars 11 carried by the upper rear portion of the base 4 support a table 12 which is reciprocated so as to equalise wear on the annular grinding face 8A of the wheel 8. The reciprocation is effected by a shaft 19 rotatably mounted in the base 4 and driven by an electric motor 14 through reduction unit 16 and chain and sprocket gearing. A rod 21 extending eccentrically through the shaft 19 has secured to one end a retaining member 22 carrying a screw 24 offset from the axis of the rod 21. A lever 25 is pivoted at one end to the screw 24 and is pivoted at the other end to a bracket 26 secured to a bar 27 slidable in the base 4 and secured to the table 12. The rod 21 is rotatable, relative to the shaft 19, by a graduated knob 30 keyed thereto, and clamped in adjusted position by a lock nut 32. A grinding wheel spindle housing 36 is supported on the upper surface of the table 12 and is transversely adjustable thereon by a shaft 37 mounted in the housing 36 and having at its opposite ends a graduated dial member 40 and a collar 41 with socket holes to receive a bar for turning the shaft 37. The latter carries a piston 39 meshing with a rack 38 on the table 12. Clamping in adjusted position is effected by a screw 43. The housing 36 supports a spindle cartridge unit 45 including an outer body member 46 within which is rotatably supported a shaft 47 on end of which the grinding wheel 8 is secured. A pulley 48 secured to the other end of the shaft is belt driven by an electric motor 51. Longitudinal adjustment of the cartridge unit is effected by rotating a nut 53 carrying an adjustable graduated collar 54. The nut 53 meshes with a threaded collar 52 integral with the cartridge body 46, the body having an elongated slot 56 engaged by a key extending through the housing 36. Clamping in adjusted position is effected by tightening against the housing 36 a lock nut 58 mounted on the body 46. Additionally, the housing 36 is split and can be tightened on to the cartridge unit by a screw 61. Supporting and positioning the cutting tool to be ground. The front of the base 4 has a pair of special vertical ribs 6 with upper arcuate surfaces 7 supporting arcuate surfaces 63 on a pivot axis adjusting member 62. Adjustment of the member 62 is effected by rotating a pinion 64 mounted on one of the ribs 6 by a stud 65 and meshing with a rack 66 on a graduated plate 67 fastened to the member 62. The member 62 is secured in adjusted position by nuts 68, 68A which tighten the plates 67, 67A against the ribs. The member 62 rotatably supports in bearings 70, 71 a spindle 72. To limit rotation of the spindle 72 a graduated disc 138 secured to its lower end carries two circumferentially adjustable limit blocks 141 each carrying a pin 143 co-operating with an abutment block 144. Each pin 143 is mounted in a cartridge 145 axially adjustable in the block 141 and is biased by a spring 152. A supporting member 75 secured to the upper end of the spindle 72 has on its upper surface a pair of arcuate surfaces 77 supporting arcuate surfaces 80 on a tool inclination adjusting member 79. A scale on the member 75 indicates the inclination of the member 79 which is clamped in adjusted position by a wedge 83 and jib 84. The member 79 supports a transverse slide 85; the latter having secured thereto a pair of guide bars 88 sliding in bores 90 in the member 79. The slide 85 is transversely adjusted relative to the member 79 by a screw 92 journalled in the slide 85 and meshing with a nut 93 fixed in the member 79. The screw 92 is rotatable by calibrated knobs 96, 97. Backlash is taken up by a non-rotatable axially-movable nut 99 between which and the nut 93 is interposed a spring 100. A lever 135 is secured to the slide 85 to effect rocking about the shaft 72. A feed slide 102 is movable on guide bars 103, 103 secured to the transverse slide 85, a screw 108 secured to the slide 85 being engaged by a nut 110 rotatable by a knob 113, in a bracket 112 fastened to the slide 102. An anti-backlash nut 117 is biased by a spring 118. To limit the feed, a collar 119 on the nut 110 carries a pin 120 which can be extended to abut a finger 122 secured in the bracket 112. The collar 119 is split and after adjustment on the nut 110 is clamped thereto by tightening a screw 123. The feed slide 102 has an upper arcuate surface 125 supporting on arcuate surface 127 on a workholding fixture 126. The fixture 126 is adjusted with the aid of a scale 134 and clamped in adjusted position by a screw 133 and a T-nut 132. The fixture 126 has a yoke 130 carrying a screw 131 to clamp a holding block 129 against a V-surface 128 on the fixture. Setting up is facilitated by a gauge bar 153 having a flat forward face 154 and slidable in brackets 155 on the spindle housing 36 so that it can be moved to bring a collar 156 thereon into contact with the surface of one bracket. A gauge is used having three aligned legs two of which contact the grinding face and the third contacts the face 154, so as to bring the faces into a common plane. The graduated collar 54 is then set at zero on the nut 53, and the nut 53 then rotated to move the grinding face 8A rearwardly the desired distance to establish the size of the nose radius of the cutting tool. Specification 622,342 is referred to.