Patent GB-1357375-A (GB)
Title: Machines for sharpening the knives of guillotines
IPC: B24B23/02
Filed: 1971-06-17
Abstract: 1357375 Grinding CARILLON ENG Ltd 8 Feb 1972 [17 June 1971] 28527/71 Heading B3D A portable machine for sharpening the knife of a power operated guillotine having a bed while the knife remains in situ in the guillotine, comprises a base 1 for movement along the bed, a carrier 6 which is mounted for pivotal movement about an axis 7 parallel to the base and has means 11, 13 by which it can be held at a set angle to the base, an arm 26 which is pivotally mounted at one end on the carrier so that it can swing about an axis at right angles to the pivotal axis of the carrier to cause it to project beyond the carrier in any direction upwardly and laterally from the base, and a powerdriven grinding wheel 43 which is mounted on the other end of the arm and is rotatable about an axis parallel to the pivotal axis of the arm. The base is channel shaped with a bottom 2, on which are feet 4, and sides 3 between which the carrier 6 is pivotally mounted on bolts 7. The carrier can be clamped in a set angular position between limits determined by clamping bolts 10, 13 mounted on the carrier and extending through arcuate slots 11 in the sides 3. A plate 14 is pivotally mounted on one of the bolts 7 and at one end has a pin 18 engaging a relatively short arcuate slot 19 in the carrier, and, at the other end, has a slot 17 through which a bolt 16 extends for clamping the plate in a predetermined position on the side 3 of the base. An electric motor 20 is mounted in the carrier and has a spindle 21 which extends through a boss 23 secured to the front face 22 of the carrier. The arm 26 and a further arm 27 are mounted between friction washers and a nut 30 on the boss so as to be able to be manually swung but firmly held in position on the boss. The spindle 21 has wheel 31 which, by way of a toothed belt 32 drives a wheel 33 mounted in an intermediate position on the arm and secured to a wheel 37 which by way of a second toothed belt 38 drives a wheel 39 secured to the grinding wheel 43, the wheel 39 being mounted on a hollow hub 41 on the end of the arm 26. An adjustable stop screw 44 extends through the hub. The arm 27 is cranked and carries an adjustable pad 48.  The machine is used for grinding the inclined face of the guillotine knife and, in use, is placed on the bed of the machine and, using a bevel gauge, the face of the grinding wheel is adjusted to the angle of the inclined face with both clamping screws 13 and 15 loose and the pin 18 engaging the upper end of the slot 19. The nut 15 is then tightened and the carrier rocked upwardly so that the pin 18 engages the lower end of the slot, so that the face of the wheel is at an angle of approximately 1 degree to the inclined face, and the screws 13 are tightened. The wheel is placed in engagement with the face of the knife and the pad 48 adjusted to be in the plane and at the same height as the wheel. With the motor switched on, the machine is moved to grind the blade up to one end which extends beyond the side wall of the bed. The arms 26, 27 are then swung to the reverse position shown for grinding up to the other end of the knife boyond the other side wall.