Patent GB-410360-A (GB)
Title: Improvements in and relating to engraving machines
IPC: B44B3/04
Filed: 1933-07-31
Abstract: 410,360. Engraving-machines. DECKEL, F., (trading as DECKEL, PRAZISIONS-MECHANIK UND MASCHINENBAU, F.), 7, Waakirchnerstrasse, Munich, Germany. July 31, 1933, Nos. 21488/33 and 1208/34. Convention dates, Aug. 1, 1932 and Oct. 20, 1932. [Class 100 (ii).] In machines for engraving workpieces of cylindrical, conical, or other curved forms but adapted for engraving flat work also, the work is caused to rotate solely by frictional engagement, with or without the interposition of a roller support, with a stationary track, which may be arranged in the plane of the tool so as to engage the work, or in a parallel plane so as to engage the roller support, the work being moved together with the tool in the direction of rotation of the work. As shown, a rotary tool 2, Fig. 1, is mounted in a support 1 carried by a pantograph linkage ; the tool 2 may, however, be stationary and the work movable, or both may be movable, and reverse copies may be produced by positioning the tool below the work instead of above it. A cylindrical work-piece 9 is pressed upwardly against frictional surfaces on arms 10 by a spring 5 acting on a bracket 4 in which is mounted a rotatable block carrying a roller 6 engaging a rail 7 on a carriage 13 in which work-supporting rollers 8 are mounted. The bracket 4 has a telescopic non-rotatable connection with a bracket 3 attached to the tool-support so that the work remains stationary during movement of the tool 2 axially of the work, whereas transverse movement causes the work-carriage to move bodily transversely and the work to be rotated on the arms 10. The work-carriage is guided by means of a rod 14 sliding in a guide 15 movable vertically in a block 12 and supported on a spring 16 which helps to press the work up to the tool, and the depth of cut may be regulated by turning a nut 22 whereby the block 12 is raised by or lowered against the action of a spring 20 ; the block may also be lowered by means of a handle 21. The arms 10 are clamped against flats 12' on the block 12 by means of eccentrics ; by turning the latter, the arms may be released for adjustment towards and away from each other to accommodate different lengths of work. When the work is conical or of other non-cylindrical shape, the work-carriage is tilted by turning the rod 14 ; when the work has an irregular surface the depth of engraving is varied by means of a screw-adjustable feeler which is mounted in the bracket 3 and rests on the work adjacent to the tool point; and when flat work is to be dealt with, such as prisms, tooth brushes, combs, slide rules, &c., the parts 3-6 are removed and the work-carriage is held stationary by means of a spring-pressed plunger placed in a bore 31 in the block 12 and arranged to engage the rail 7. In a modification, the rotation of the work 9 is ensured by providing a stationary support for the rollers which are rotated thereby when the carriage moves transversely, and, in turn, rotate the work. The block 12, in this case, is pivotally mounted. In a further modification particularly for engraving soft materials, the work is rolled entirely by its supporting-rollers, and the tool carriage slides axially of the work in a slot in a bracket connected to the workcarriage by a telescopic tube, the roller 6 and rail 7 being dispensed with ; and in a still further modification, the work 9 is pushed in the transverse direction by shaped rollers mounted in a bracket swivelled to the tool support.