GB627330A - Improvements in or relating to work supports for grinding machines and the like - Google Patents

Abstract

627,330. Grinding knife-blades. FAIREST, Ltd., M., FAIREST, M., and FAIREST, D. H. Jan. 27, 1947, No. 2435. [Class 60] [Also in Group XXII] A grinding or other machine tool comprises a machine bed, a table movable longitudinally on the bed and carrying a transverselyslidable work slide and a push rod having a positivelylimited movement longitudinally of the table, a cam on the push rod to move the work slide, steps on the bed to engage the push rod near the ends of its movement with the table, the positive engagement of the push rod with the table at the ends of its limited movement determining the stroke of the table, together with hydraulic means for movement of the table. As applied to a knife-grinding machine a work slide 17 is carried on a table 12 which is moved towards or away from a cup wheel 16 by means of a piston 47 working in a cylinder 46. The table 12 has two V-grooves 35 inclined at 45 degrees to the axis thereof, corresponding grooves 36 being formed in the slide 17; blocks 37 secured to the table by screws 38 form guides for the slide which is held vertically by washers 39 on pins 41 projecting from the table through slots 42 in the slide. A longitudinal slot 52 on the table carries a push-rod 54 having a lateral arm 55 and a cam surface 58 on which bears a follower roller 60 secured to the slide 17. The slide 17 carries a bracket to which is pivoted at 20 a work holder 21 provided with a long block 22 and pad 23 against which the knife blade is held. An arm 30 of the work support 21 carries a roller 31 which runs on a bar 32, adjustment of the bar serving to impart a slight rotary movement to the work holder if required. In operation the table is moved towards the wheel 16, the blade 25 lying clear of the wheel as shown in Fig. 1. When the pushrod 54 encounters the stop 63, further movement of the table causes the roller 60 to ride over the cam surface 58 and move the work slide in to the grinding wheel against the pressure of spring 44. The movement of the table is then reversed and the blade is drawn across the wheel until the stop 67 contacts arm 55 of the pushrod; further movement of the table carries roller 60 to the lip of the cam surface 58, when the pressure of spring 44 causes the roller to push the rod 54 to the right and the slide 17 is retracted with a snap action.