Patent GB-190516920-A (GB)
Title: Improvements in Knife-grinding Machines.
Inventor: ROBINSON HANSON
Filed: 1905-08-21
Granted: 1906-01-04
Abstract: 16,920. Robinson, H. Sept: 1, 1904, [date applied for under Patents Act, 1901]. Surfacing; sharpening; bevelling.- Relates to a knifegrinding machine in which the blades are mounted on pedestals fixed at regular intervals round a circular table, which is intermittently rotated so as to bring the blades successively under a number of grinding-disks and finally opposite an ejecting-apparatus. The circular table or support F, Fig. 1, is supported on rollers E carried on pillars D, and rotates round the circular column C. A slowlyrotating bowl L on the eccentric. M is driven from the main shaft by spur and bevel gearing, and enters guideways K between plates J fastened radially to the support, thus causing it to rotate. When the bowl L leaves the guideway, a cam Z mounted on the shaft a raises a lever X so as to make it engage with one of the guides and so lock the supports until the bowl L enters the next guideway, when the cam Z moves the locking-lever X out of contact. The blade supports are bolted to the floor of the support F, and comprise pedestals c, Fig. 15, carrying removable tops d with upstanding pieces e shaped to conform to the blank f, the inmost one having a pin g to fit the hole in the blade for the pivot pin. In treating blades with tangs, the support is made of the requisite shape and a groove is provided to receive the tang and hold it in position. The blanks are held on to the supports by clamping-fingers i normally held down by springs j. The knife blank is put on the support during one of the intervals during which the rotary support is locked, and is then passed on to the first face-grinder. The grinders, a section of one of which is shown on the right in Fig. 1, are mounted in bearings B', B<3> carried on a frame A<3> bolted to the central support and are provided with hoods H<3>. The driving-pulley E<3> is mounted on the spindle C<2> in such a manner that the spindle is capable of longitudinal motion. The grinder, which is composed of a ring 3 of emery held on to a faceplate 7 by a clamping-ring 8 and a plate 9, is held down to the work by a weight R<2> at the end of the lever O<2>. An adjustable stop S<2> is provided to limit the downward movement of the grinder. The grinding-disks are raised, to allow the knifeblades to be shifted, by lifting-rods V<2> which terminate in rollers W<2> running along the top I of the inside flange G of the rotary support F, which is undutated in the requisite manner so as to raise all the grinders simultaneously as soon as the eccentric L begins to rotate the support and to lower them on to the work as soon as the motion ceases. In the machine illustrated, the knife blank passes under four face-grinders and then comes under two angle-grinders, which level and round off the end to the usual shape. These angle-grinders, one of which is shown on the left in Fig. 1, are mounted similarly to the face-grinders except that the bearings in which the spindle rotates are clamped, so as to be capable of radial adjustment, to a frame Y<2>, which is in turn bolted to a frame X<2> attached to the central column B. The lower bolt Z<3> acts as a pivot for the frame Y<3>, and the upper bolt Z<3> moves in a slot to allow for angular adjustment. The arrangement for lifting the angle-grinders is similar to that described above. After the knife blank has been operated on by the last grinder, during the ensuing motion, a projection k, Figs. 3 and 13, on the top of the clamping-finger enters the flared mouth of a channel-piece l, which is arranged tangentially to the circumference of the flange G, and thus gradually raises the clamping- finger i until, when the rotary support conies to rest again and the knife blank is opposite the discharging-mechanism, the clamping-finger is raised to its highest point, the knife blank being thus released and removed. The empty support is then turned forward through another step to the position where the blanks are inserted. The clamping- finger i is kept elevated until this is accomplished by the projection k running along another channelpiece n. This piece n is pivoted at the end joining on to the track l, and a bell-crank lever p, Fig. 3, one arm of which is attached to the track n and which is worked by a cam u, keeps it held inwardly until the fresh blank is inserted and then allows it to move gradually outwardly so that the clamping- finger i is gradually lowered on to the blank. Before the knife blank comes under the first grinder, the projection k escapes from the track n and the clamping-finger rests on the blank. The discharging-mechanism comprises a channel N', Fig. 3, the end of which is shaped as in Fig. 13, with fingers S<1>, T<1>, U<1>, so as to slip under the knife blank between the projections on the support. Thechannel is supported on the pivoted levers L<1>, R<1>, which are operated by cams D' so devised as first to raise the finished knife-blade to free it from the pin g, and then to move it outwardly to free it from the clamping-finger i, and then to combine a turning and outward motion so as to make the knife-blade slide down the channel N' on to an endless conveyer or other suitable contrivance.