Patent GB-140117-A (GB)
Title: Method and machine for reducing chips produced in turning and the like operations
IPC: B23D31/00
Filed: 1918-07-05
Abstract: 140,117. Philipp, R., and Bing, J. July 5, 1918. Roller and roller-and-breast mills; apparatus.-Metal chips, produced by turning, drilling, planing, and other operations, are reduced by an apparatus comprising one or more rollers provided with longitudinal knives and co-operating with similar rollers or a stationary breast, the bales of chips being drawn into the apparatus, and the chips being disentangled and disintegrated by the action of the rollers. A series of such rollers may be employed for effecting reduction in stages, and the appanatus may be provided with a fine-grinding device. The roller 1 shown in Fig. 1 is provided with oblique knives and may co-operate with a roller having the knives set in the opposite direction and rotating in the opposite direction and at a different speed, the arrangement causing the chips to be sheared and to be fed in the direction of the arrow II from one end of the roller to the other. To prevent choking, the knives may be formed with gaps 3 which may be formed with sharp bevelled ends 3<a>. The gaps on adjacent knives are staggered to prevent long chips from winding round the rollers. The roller 1 may cooperate with an adjustable pivoted breast d, Fig. 5, or with an upper roller and a lower roller. In some cases, a pair of long rollers are arranged as cantilevers and are supplied with chips from a hopper arranged near the support of the rollers. The chips are fed by the knives towards the free ends of the rollers, and, upon being disintegrated, are discharged, whilst foreign bodies such as bolts are discharged at the free ends of the rollers. In the apparatus shown in Figs. 7 and 8, two knife rollers 1 geared together by pinions 9 are mounted vertically in a casing 7 formed with a hopper 8 for the bale, and with helical ribs 5 which approach the knives 2 closely. The rollers are formed with fingers 4 which eater the bale and carry the chips around the outside of the rollers and into the rear nip of the rollers, the chips being disintegrated by the co-operation of the knives 2 with each other and the ribs 5. The rihs may be formed with sharp edges. The knives and the ribs are formed with gaps 3, 6 for the passage of the fingers 4. The knives may be formed with cutting- edges which co-operate with cutting-edges at the top and bottom of the gaps, the top and bottom parts of the gaps being offset relatively or being inclined in opposite directions. The knives may be arranged to engage in the manner of helical gears, in which case the knife rollers are driven at the same speed; or, as shown in Fig. 8, the knives on the two rollers may be arranged to approach closely to each other, the rollers being driven at different speeds. The knives may be fitted in grooves in the rollers, or may be secured to the faces of square rollers. Converging spaces may be provicled between the rollers and the casing, the arrangement causing the chips to be compressed before entering the rollers. The rollers are provided at the bottom with the projections 14, Fig. 7, which stir up the chips and prevent the outlet of the casing from being chokecl. The rollers may be fitted at the outlet with a finegrinding device 10 consisting of a milling-cutter which co-operates with a stationary sleeve 13 formed with helical webs 12. To prevent objects such as bolts from entering the fine-grinding device, the upper surfaces of the parts 10, 13 are arranged in the same plane. The reduced chips pass through annular openings 16 arranged between members 17 on the casing and conical rings 15 on the rollers, the openings being adjusted by employing members 17 and rings 13 of different sizes. The members 17, 15 may be arranged above the device 10. Specification 4871/86 is referred to.