Patent GB-288375-A (GB)
Title: Improvements in methods of and machines for grinding or sharpening the edges of continuous metal strips
IPC: B24B3/48
Filed: 1927-01-10
Abstract: 288,375. Heide, H. C., (Gaisman, H. J.). Jan. 10, 1927. Cutting-edges, shaping and treating; wheels; guides and rests.-A machine for grinding, sharpening, and honing the edges of a metal strip which is afterwards cut into lengths to form safety razor blades consists of a frame 1 provided with spaced rods 2 for supporting the grinding &c. parts. The strip A is unwound from a reel 3, passes through the machine and is rewound on a reel 4. The grinding is effected by four wheels 9 - - 12 mounted opposite each other in pairs to act on diagonally opposed edges of the strip, the wheels being mounted on shafts 13 and located within a casing 8 mounted on the rods 2. The wheels are removably mounted by means of screws 28, Fig. 10, and a rod 27 held in place by a screw 30, the shafts 13 being hollow to receive the rods 27; the shafts are carried by bearings in blocks 22 adjustable by screws 22a in frames 20, which are angularly adjustable, to position the wheels relatively to the strip, by means of a curved bed and screws 38. In the casing 8 are apertures 8<a> for the passage of the strip A which is guided by plates 42, 43, Fig. 7, held by screws in frames 40 in the apertures 8<a>. The plates are shaped to present an opening 44 for the strip, which is held down on to a block 44<b> by a spring-pressed block 44<c> movable by a lever j to admit a new strip. The plates 42, 43, are cut out at 42<b>, 43<b>, to allow access of the grinding-wheels to the strip. The wheels are driven by belts 17 from a main shaft 18. After passing the grinding wheels, the strip is honed by a pair of rotary hones 48, 49, which hone the upper edge, and a pair of hones which hone the lower edge, each pair of hones is located in a separate head 52 carried on the main frame. The hones have spiral operating surfaces and are driven, through gearing 73, 74, 76 and a jointed shaft, from a pulley 70 driven by a belt 71 from the shaft 18. The hones are carried by frames 55, Fig. 14, pivoted to the head 52 and are pressed up to the strip by springs 60, nuts 61 engaging arms 52b of the head serving to adjust the hones. The heads are adjustable by screws 66, 65, or as shown in Fig. 22, may be yieldingly supported by a system of weighted levers 85, 89. The strip is retained in position during honing by guides comprising two plates 78 held together by screws and provided with hardened facing strips. The strip is propelled by feed rolls 95, 96, Fig. 3, carried by a bracket 99 mounted on the rods 2 and driven through worm gearing 107, 109 by a chain 112 from the shaft 18; the pressure of the roll 96 against the strip is adjusted by a screw 166 acting against the pressure of a spring. The strip is kept in correct horizontal position by means of devices at B. The ground and honed strip is wound flatwise on the reel 4, Fig. 1, being turned into position by a roller 114. Water is supplied to the heads by a pump 131 leading to a tank 125 the heads having outflow pipes leading to a tank 129. Specification 288,514 is referred to.