Patent GB-485358-A (GB)
Title: Improvements in or relating to grinding machines
IPC: B24B3/54
Filed: 1937-10-15
Abstract: 485,358. Grinding knives &c. VESSIR, D. J. F. Oct. 15, 1937, No. 28097. Convention. date, Oct. 17, 1936. [Class 60] A machine for grinding knives &c. comprises a pair of opposed cup-shaped grinding wheels 1 and 2 which are of different diameters, so that the smaller can enter partly within the larger, and between which the knife &c. is inserted and moved to-and-fro, the wheel spindles, driven by elastic bands, being journalled in casings 12, one of which may be fixed in a support 21 while the other has trunnions 19 engaging a longitudinal slot 20 in the support so as to be adjustable both angularly and axially by means of a rod 28 connected to the casing by a pin 27. In the form shown in Figs. 2 and 3, both casings 12 are simultaneously adjustable, angularly by a knob 5 and axially by a knob 6. The knobs are connected to their spindles 44 and 47 respectively by a slipping clutch comprising a spring-loaded ball 53 co-operating with a recess 52. The support 21 is fixed to a bed 26 in an adjustable inclined position by bolts 24. Each rod 28 is pivoted at its lower end to a plate 30 which is guided vertically on the support 21. The spindle 44, which is universally journalled in the support 21, is threaded to engage in a nut 42 pivotally carried by one arm of a lever 35 mounted on the support, the other arm 39 extending through an aperture 40 in the plate 30, whereby rotation of the knob 5 effects lengthwise movement of the rods 28 and thus angular movement of the casings 12. The spindle 47 is carried by the plate 30 and has right- and left-hand threaded portions engaging nuts 50 which have projections 34 passing through horizontal slots 33 in the plate 30 into vertical slots 32 in the rods 28. Thus, rotation of the knob 6 moves the rods 28 angularly in opposite directions to move the casings 12 axially. The trunnions 19 and the pin 27 may, in the case of the small wheel, be arranged further from the wheel than in the case of the large wheel, thereby causing the angular movement of the small wheel to be larger than that of the large wheel. The casings 12 may be so arranged that the wheels lie at an angle to each other both in elevation and in plan. The vertical movement of the plate 30 can be effected by means of a vertical screw spindle, or the rods 28 may be connected directly to the levers 35 and the spindle 47 be carried by the support 21, the plate 30 being then dispensed with. The two knobs may be replaced by a single knob secured to a spindle 57, Fig. 8, which is movable endwise and has a radial pin 63 co-operating with axial slots in the adjacent ends of sleeves 59 and 69 loosely mounted on the spindle. Sleeve 59 is integral with a bevel gear 58 meshing with a bevel gear 64 splined on a spindle 65 geared to the spindle 47, while sleeve 69 is threaded and engages a nut 42 having trunnions engaging grooves 72 in the lever 35. Thus, by moving the spindle 57 to the left, to couple it to the sleeve 59, and then rotating it, axial adjustment of the casings 12 is effected, while by moving the spindle to the right it is coupled to the sleeve 69 for angular adjustment of the casings. In an intermediate position, the spindle 57 is coupled to both sleeves.