Patent GB-1125377-A (GB)
Title: Rotary knife machine for cutting single or multiple rolls
IPC: B26D7/12
Filed: 1966-03-01
Abstract: 1,125,377. Sharpening cutters in situ. O. I. JUDELSHON Inc. 1 March, 1966 [26 April, 1965], No. 8820/66. Heading B3D. [Also in Division B4] A rotary knife machine for cutting single or multiple rolls comprises stationary shaft means 20 for receiving at least one roll R1 of material to be slit-mounted on a frame 12, a cutting mechanism 24 including a rotary knife 28 movable on the frame through a cutting cycle relative to the roll, a grinding mechanism 82 mounted on the cutting mechanism in operative relation to the rotary knife for movement therewith to sharpen the knife, and control means for periodically moving the grinding mechanism out of operative relation to the knife such that the grinding mechanism will continue to move with the knife but will be ineffective to sharpen the same. The rotary knife 28 is mounted on a shaft 30 in bearings 32 on a knife carrier 34 and driven from a motor 44 by a chain drive 54. The carrier is slidable along guideways 40 by a rack-andpinion mechanism 62, 66, the pinion being rotated by a chain drive 78 from an automatic control or, as shown, a hand wheel 30, to cut a pair of rolls R1, R2 into lengths, the rolls being mounted on shafts C1, C2 and rotated by chucks. The guideways 40 are mounted on carriage 26 which is indexable along rails 14, 16 on the frame 12 to enable the knife to cut successive lengths from the rolls. The grinding mechanism 82 comprises a grinding wheel 86, Fig. 2 which has a plane face for grinding the bevel edge 28a of the knife and is mounted on the shaft 84a of a motor 84 mounted on a slide 88 movable along a guideway 90 on knife carrier 34. The movement of the slide 88 is effected by rotation of a lead screw 92 which is in threaded engagement with the slide and is received in an actuating member 102 screw threaded into an upstanding part 90a, Fig. 4 of the guideway 90, the lead screw being axially located relative to the member 102 by collars 104, 106. The lead screw is rotatable manually by a hand wheel 94 to initially adjust the position of the grinding wheel, and the actuating member 102 is rotated by operation of a pneumatic cylinder 96 under the control of a timer to move the grinding wheel into and out of operative relation with the knife while permitting it to move with the knife. In another embodiment for cutting a single roll R1, Fig. 7, the knife 224 is mounted on a shaft 226 supported in a carrier 228 mounted on a pivot 230 on a carriage 222 movable along rails 214, 216, the shaft being driven by chains 238, 242 from a motor 234. The grinding mechanism 248 is mounted on a carrier 250 also mounted on the pivot 230 for movement with the knife carrier 228 by means of a handle 232. The carriers 228, 250 are interconnected by a lead screw 260 which is rotatable by a handle 262 to initially adjust the grinding mechanism relative to the knife, and an actuator 270 in threaded engagement with a member mounted on the carrier and in which the screw is axially located by collars is rotatable by a pneumatic device 264 to move the grinding mechanism towards or away from the knife while permitting the mechanism to rock with the knife about the pivot 230.