Patent GB-219558-A (GB)
Title: Improvements in or relating to pencil sharpening machines
IPC: B43L23/00
Filed: 1923-11-09
Abstract: 219,558. Page, S. E., (Industrie-Dienst Ein-und Ausfuhr-Ges.). Nov. 9, 1923. Pencil sharpeners.- In pencil-sharpening machines of the kind wherein the pencil chuck is rotated synchronously with a cutting-disc which which is fed laterally towards the pencil, the cutting-disc 15, Figs. 2 and 4, is fixed on a lengthwise movable shaft 14, and am adjustable stop 8 is provided to obstruct the shaft at a point where the cutter and shaft have advanced sufficiently to complete the sharpening operation. The cutting-disc is screwed upon the hub of a pinion 18 keyed upon the shaft 14, rotation being imparted by a handle 22 driving a shaft carrying a pinion 23 which engages both the pinion 18 and teeth 24 on the periphery of the rotatable chuck. A helical spring 16 on the shaft 14 is compressed when the shaft and cutting-disc are fed forward, by means of a hand lever 58 pivoted upon the machine casing and provided with a nose piece bearing against the rear face of the pinion 18. The end of the shaft is projected through a shouldered bush 19 loosely held in a slot in the casing to facilitate the withdrawal of the shaft and cutting-disc. The adjustable stop 8 for the shaft consists of an arm extending from an angle piece 10 pivoted at 9 on the chuck support 6, and arranged to be in alignment with the shaft when a screw 13 on the chuck support abuts against the bottom of a slot in the member 10. The chuck carrier 6 is pivoted by a bolt x upon the fla.t portion 2 of the casing, and carries a pointer 30 to indicate on a scale 29 the angular direction of its axis with respect to the cutting-disc. The chuck carrier can be clamped in a set position by operating a handle, 25 on a shaft 28, which carries a cam co-operating with a loose washer 4 on a bolt 5 screwed into the bottom of the carrier, clamping being effected by the cam forcing the washer 4 against the underside of the flat portion 2 of the casing. The chuck comprises a casing 7 rotatably mounted in the carrier 6 and containing a slidable sleeve 33, Figs. 6 and 8, which has annular flanges 31, 32, 35 and a conical extension 37 provided with six radial slots 38 extending into the flange 32. An annular groove 36 between the flanges 32, 35 receives a split ring 43 which is threaded through holes ir the inner ends of self-centring jaws 39 inserted within the radial slots 38. A conical member 44 tapered to correspond with the outer ends 41 of the jaws is inserted within the casing 7 and held in position by a ring 45 screwed upon the end of the casing. The gearing teeth 24 of the chuck are disposed around the periphery of the ring 45. The jaws of the chuck are normally closed by a spring 34 surrounding the sleeve 33 between the flanges 32 and the closed end of the casing, the jaws being pushed forward with their tapered ends projecting through a central hole in the conical insert 44. The sleeve 33 may be drawn back by hand to enable a pencil to be inserted in the chuck, but preferably the flange 31 is engaged by the yoke 50, Fig. 2, of a forked lever 49 pivoted at 48 on a bracket 6a on the chuck carrier and carrying a swinging lever 51 at its lower end which is depressed when a pivoted bridge 56 is pushed down by means of a hand-lever 57.