Patent GB-773439-A (GB)
Title: Improvements relating to the sharpening of edged cutting tools
IPC: B24B3/02
Filed: 1955-06-30
Abstract: 773,439. Grinding tools.. GLEASON WORKS. June 30, 1955 [July 12, 1954], No. 18957/55. Class 60 A machine for sharpening cutting tools such as multi-bladed face mill cutters or disc cutters comprises a member 26, Fig. 1, mounted for angular oscillation, a head 29 movable relatively to this member in a plane perpendicular to the axis of oscillation, a grinding wheel W supported by the head 29 for rotation about an axis inclined at an acute angle to the axis of oscillation, and means for oscillating the member 26 so as to stroke the grinding wheel back and forth across a plane face of the tool and for moving the head 29 alternately in opposite directions between successive. strokes so that the grinding wheel traverses the tool in different paths on successive strokes. The tool C is is mounted on a work spindle journalled on a horizontal axis 32 in a head 33 adjustable on a turret 34 about a second horizontal axis 35; the turret is adjustable about a vertical axis on a compound slide 36, 37. The conical grinding wheel W, Figs. 1 and 3, is carried for rotation about an axis inclined at an acute angle to the vertical by the head 29 which is mounted for oscillation about a vertical axis 28 on trunnions in the member 26; this member is mounted for both oscillation about, and movement along, a second vertical axis 27 on a turret 24 adjustable. about a horizontal axis 25 on a slide 23 movable vertically on a column 22. The oscillation of the head 29 and member 26 are effected by a motor 39, Fig. 3, through a vertical shaft 42 carrying an elongated pinion 43 and two gears 44, 45. The gear 44, Fig. 6, drives through an idler gear 48 and pinion 49 a shaft which is journalled in an arm 53 mounted in the turret 24 to swing about the axis 54 of the idler 48 and carries an eccentric roller 52 engaging a cam track 56 in the underside of a cam 46 driven from the elongated pinion 43. The rotating eccentric 52 causes the arm 53 to oscillate about the axis 54 and by means of a gear segment on the arm 53' meshing with a pinion segment 55 keyed to the member 26 results in the latter member swinging in opposite directions about the axis 27. The head 29 is oscillated about the axis 28 by being provided with a follower roll 68, Fig. 4. which is urged by a spring 69 acting between the head 29 and member 26 against a cam 67 on the upper end of a shaft 66 rotating within the member 26 on the axis 27 under the action of the gear 45. The cam 67 has two concentric surfaces of different radii co-operating with the roll 68 so that the head 29 is swung about the axis 28 to vary the radial distance of the wheel W from the axis 27 between opposite swings of the member 26 and thereby move the active surface of the wheel in the closed path indicated by the dotted line 78 in Fig. 4. These oscillations occur as long as the eccentric 52 is in the circular portion of the cam track 56, and, when the continued rotation of the cam 46 causes the non-circular track portion to become effective, the arm 53 is swung about the axis 54 and the wheel W is thereby withdrawn from the cutter. A spring-pressed roller 61, which during the oscillatory cycle engages a curved part 59 of the segment 55, acts against a stop face 58 of the latter when the -eccentric 52 reaches the open portion 57 of the cam track and urges the segment 55 against a stop 63 so that the wheel is held in its limit position to permit of dressing the wheel or indexing the tool. To provide for slow feed of the wheel into the cutter blade during the sharpening operation, the member 26 is journalled in a slide 71, Fig. 3, which is movable vertically along a guide way 72 in the turret by means of a follower roll on the slide engaging a peripheral track in the cam 46. This cam is mounted for rotation on a vertical shaft 47 which is adjustable vertically by hand-operated worm gearing so as to set the slide 71 and therefore the wheel W in correct position for dressing. Specification 756,808 is referred to.