Patent GB-132838-A (GB)
Title: Improvements in Knife Controlling Mechanism for Cutlery Revonating Machines.
Inventor: DILG CHARLES HERMANN JULIUS
IPC: B24B3/54
Filed: 1918-07-26
Abstract: 132,838. Dilg, C. H. J. July 26, 1918. Knives, cleaning and polishing.-Comprises means for preventing the insertion of a knife into a knife-cleaning machine except in the particular way contemplated in the design of the machine. The invention is shown in Figs. 1 and 4 applied to a machine having three co-operating pairs of tangent-wheels, in which the knife is first brought down between the pairs of wheels when they are separated, and then, by depressing a knife-rest 27, it causes the wheels to close together into the acting position. The present mechanism prevents damage to the wheels by the knife blade being reciprocated in a lateral direction during the run of the machine. The outer pair of wheels is guarded by two weighted levers 33 having interpenetrating co-operating surfaces which prevent access of the knife blade x to the rest, unless the levers are moved outwards by the engagement of the shoulder of the knife with camsurfaces 32a. These levers and their supports move up and down with the knife-rest and are guided by rods 31<a> sliding in the framing of the machine. Guards for the pairs of inner wheels prevent the knife blade from being re-inserted between any pairs of wheels after being withdrawn laterally during the run of the machine. The knife guides 38, Fig. 4, which are adjustable laterally in fixed guides 36, 37, carry weighted levers 40 which are moved aside by the knife blade engaging the cam-shaped upper edge. The levers 40 for the centre and rear pair of wheels are connected together, and the lever for the rear pair of wheels is set in advance of the lever for the middle pair as shown at 41, so that a knife blade which has been withdrawn laterally from the rear pair, while still remaining between the middle pair, cannot be re-inserted between the rear pair of wheels. The inward swinging movement of the levers 40 is limited by pins 40'. A modified construction of this " interior gate mechanism " is described which differs mainly from the construction described above in the means used for supporting the knife-rest. Figs. 6 and 8 show modified gate mechanisms for the outer pair of wheels. The construction shown in Fig. 6 is on the same general lines as the constructions of interior gate mechanism described above, and comprises a lever 56 which is notched at 56<b> to arrest the knife blade, but which is moved aside by the engagement of the shoulder of the knife with the cam-surface 56a. In a modification of this particular form, used with machines having fixed knife-rests, the lever 56 is of U-section and embraces the knife guide. The notch is formed on one edge of the lever and the cam-surface on the other edge. In the construction shown in Fig. 8, plates 60, spring pivoted on shafts 62, are moved outwards by the engagement of the shoulder of the knife with cam-surfaces at their meeting edges. A notch diverts the knife blade from the line of contact of the plates, so that it is impossible to open the plates by exerting pressure with the knife blade.