GB638869A - Improvements in engraving, copying and like machines - Google Patents

Abstract

638,869. Engraving. NEW HERMES, Inc. April 23, 1947, No. 10908. Convention date, May 9, 1945. [Class 100 (ii)] [Also in Group XXII] An engraving or copy-milling machine has a pantograph 18 carrying a stylus 88, a tool head 22 and rotary tool 41, the pantograph being pivotable about a vertical axis 20 on a support 14 which is in turn pivotable about a horizontal axis 16 on the base, and spring means 39 being provided to bias the support upwardly about the horizontal axis so as to move the tool away from a work holder 23 on the base. The stylus 88 is carried on a hinged arm 35, and a button 74 is provided on the tool head for pressing the tool into engagement with the work 73 against the action of the spring 39, Fig. 3, attached to an arm 38 of the support 14. To control the depth of cut, the engraving needle 49, Fig. 4, projects by an adjustable distance beyond a conical abutment member 46 secured to a boss 45 on the pantograph arm 32. A screwed sleeve 53, after adjustment on the needle to give the required projection, is locked to the needle by a screw 55 and is then screwed into a tubular holder 48 rotatably mounted in the boss 45 and having a pulley 59 connected by a belt to a driving motor 62. To maintain the belt tension during movement of the pantograph, a spring 68 tends to turn the motor on a pivot 63. Pantographs giving different reduction ratios may be substituted for the pantograph 18 and are placed on an additional pivot such as 76 positioned on the arm 14 so that the tool head and stylus occupy the same positions as before. The diameters of the pivots may be different so as to co-operate only with the corresponding pantograph. The Specification as open to inspection under Sect. 91 describes also elongated bolt holes in the guide member 46, thus allowing it to be centred with the point of the tool, and states also that the machine is portable. This subjectmatter does not appear in the Specification as accepted.