| 摘要 |
951,375. Making screws; rolling; lathe details. ALTENLOH, BRINCK & CO. Dec. 31, 1962 [Dec. 30, 1961], No. 49167/62. Headings B3A, B3M and B3T. A method of manufacturing wood screws from prefabricated blanks includes the steps of rolling a shank portion of a blank between thread rollers, and tapering the end of the blank by a cutting tool. Thread rollers 3 and 4 are driven through gears 6, 7, 9, 10 and 12, and a sliding coupling 14, by a motor 1, one of the rollers 3 being movable by an hydraulic cylinder 16 to alter the gap between the rollers. The same motor drives through gearing 11 to rotate cams on a shaft 5 to control the movement of a sliding table 23 on which is mounted a cutting head 20. When a shank portion of a blank has been rolled between the rollers 3 and 4, the head 20 approaches the screw end in recesses 19 and cuts a thread on the end. Axial movement of the table 23 and hence the head 20, relative to the blank is controlled by a lever 26 actuated by a cam 25, while transverse relative movement is controlled by a cam 30, the cam profiles determining the final profile of the screw end. Screws 34 and 35 permit adjustment of the head 20. The head, which has carbide tipped cutters 27 or external cutters, Fig. 4 (not shown), is driven by a motor 22. Cams 15, 17, 21 and 36 control the feed of the screw blanks, the transverse movement of the roller 3, and the ejection of the finished screw. The motor 1 can be controlled so that the speed of the rollers 3 and 4 is slower during cutting than during rolling. |
