Patent GB-190008956-A (GB)
Title: Duplicate Ink Copy Attachment for Typewriting Machines.
Inventor: GORIN FRED PROCTOR
Filed: 1900-05-15
Granted: 1900-07-14
Abstract: 8956. Gorin, F. P. May 15. Type-writers. - Relates to duplicating-devices for type-writers, and is described with reference to the Remington machine. In addition to the usual ink ribbon, the machine is provided with one or more auxiliary ink ribbons, which are used for duplicating purposes instead of carbon paper. To prevent reverse impressions being produced on the back of each sheet by the ribbon beneath it, sheets of thin paper may be placed between the other sheets, additional copies being thus obtained which can be read through the thin paper. As an alternative, a protecting - strip may be wound with each ribbon upon the ribbon spools or upon separate spools, the protecting-strip may be clamped in the holder of the auxiliary ribbon and be replaced as often as it becomes impregnated with ink. Fig. 3 is a vertical section through the platen, showing an auxiliary ribbon C, guides D, and spools E. The spools are mounted on a shaft I which bears a ratchet-wheel T actuated by the linespacing mechanism. The shaft I is surrounded by a sleeve H, to which are secured arms G, Figs. 3 and 4, which carry the ribbon guides D. To the arms G are pivoted spring catches n adapted to engage with either of three notches m<2> in a fixed plate K. In Fig. 4, the guide D is shown in its lowest or working position, the catch n being engaged in the central notch of the plate K. It can, however, be thrown either backwards or forwards for the respective purposes of facilitating the insertion of the sheets of paper between the ribbons, or of enabling the ordinary type-writing operation to be carried out when duplicate copies are not required. The ribbon-guides each consists of a plate D, Fig. 8, extending from the pivoted arm G, an intermediate plate D<1>, and a bottom plate D<2>. The intermediate plate is shown detached in Fig. 9. The plates D' and D<2> are hinged at D<3>, and are turned against the tension of the spring D' by the contact of the lever G<1> with a fixed stud when the ribbon is moved out of the type line, as indicated by dotted lines in Fig. 7. The ribbon is thus carried further from the platen than would be done by the swinging movement of the arms G alone. The ribbon is guided between wires F and within the overhung slot a<1>. It passes upwards through the slot b, downwards over the guiding-edge c, and upwards over the roller d to the ribbon spool E, which is braked to tension the ribbon. Spring bolts Z, Fig. 3, enable each spool alternately to be clutched to the shaft I, while the other runs loose thereon. The guiding and feeding of the sheets on the platen is effected by end paper guides M and clamping-rolls 0, Fig. 11, and a central paper guide N and clamping-roll P, Fig. 12. All the clamping rolls and guides can be removed simultaneously from the paper by means of a rocking shaft carrying slotted arms or pins which engage with the shafts of the clamping-rolls. Fig. 16 is a view of the carriage from beneath, showing a modification in which the auxiliary ribbon C passes directly between the spools E and is not capable of being moved out of the type line. A friction disc C<2> engages with the platen, and drives one or other of the spools through bevel-wheels D<3>.