Patent GB-191002164-A (GB)
Title: Improvements in Die and Roller "Eccentric" Engraving Machines.
Inventor: CROSSLAND ARTHUR ALBERT
IPC: B44B3/00
Filed: 1910-01-28
Granted: 1911-01-27
Abstract: 2164. Crossland, A. A., and Crossland, J. A. Jan. 28. Engraving.-Relates to an engraving-macbine for engraving pin patterns on mills for the production of designs on printing-rollers, in which the depth of cut is determined by a tracer, and the i n t e rmittent action of the tool is obtained by an independent mechanism. The slide B, Fig. 1, carrying the toolspindle is adapted to slide on the frame A. The tool-spindle b is rotated by a belt h, and is normally raised by a helical spring, but is depressed into contact with the mill e by a set-screw p<1> in a plate p pivoted between centres o<2> on a plate carried by the end of a pivoted tracer lever m connected by a link to a tracer which co-operates with a pattern roll. The set-screw p<1> carried by the plate p is adapted to bear on a plate q, pivoted at c' and arranged to bear on the upper end of the tool-spindle. Bearing upon the outer end of the plate p is a set-screw r in a plate s attached to a drill-feeding lever t, which is mounted between centres u and connected by a link t' to a pivoted lever v. On the lever v is a block v<1> adapted to bear on a cam w, whereby the plate p is depressed intermittently, and independently of, but only to a depth determined by, the tracer. The mill e is rotated intermittently by means of interrupted gearing, so that the mill is stationary during each operation of the tool. As soon as the mill e has made one revolution, the tool carriage B is traversed by means of a screw operated by a winch handle, or automatically. A spring catch prevents further accidental movement of the screw. To enable the design to be produced in lines other than circumferential, the tool-holder is mounted so as to be capable of intermittent movement longitudinally of the carriage B. The tool-carrier c is mounted on centres 2, and is provided with an arm 3 adapted to bear against a bell-crank 4 connected to a lever 6 mounted on centres 7. The lever 6 is connected to a block 8, which bears on a cam 1 so formed that, as the mill e rotates, the tool is slowly advanced longitudinally. The cam 1 is driven from the intermittent die operating shaft, so that the die and the tool move simultaneously. Instead of working around the mill e, the tool carriage B may be traversed, and the die rotated only as each line is completed. For this purpose, the mill e could be arranged both to move endways and to rotate, and the tool carriage B held stationary. Two pattern rollers may be employed, the tool being controlled by one or the other as required. Two or more drills may also be employed to act on the mill at different points. If a gap is required to be left on the circumference of the roller, a second cam, driven in synchronism with the roller, may serve to hold the block v<1> away from the operating-cam w. The intermittent gearing for turning the mill 7 when the tool is out of action, Fig. 5, comprises a wheel y<1>, having two stops y<3> thereon, the wheel being toothed on one side and plain on the other. One stop y<3>, contacting with a stop y<4> on the wheel y<2>, starts the latter wheel, which is driven for a half-revolution, and left stationary during the other half. The other stop y<3>, not being diametrically opposite, remains idle, but becomes operative if the driver y' is reversed.