GB683132A - Improvements in and relating to hectographic duplicators - Google Patents

Abstract

683,132. Copying documents; printing surfaces. FLACH, W. Sept. 30, 1949 [Oct. 1, 1948], No. 25119/49. Class 100 (ii). In a hectographic duplicating apparatus in which the drum accommodates simultaneously a plurality of mirror script originals, at least one of the originals has both ends connected to means disposed inside the drum by which it can be displaced from inside the drum for part printing such as a single line or a series of lines therefrom. The drum 1 has an original 3 with its total text, such as main headings, lying on the outside of the drum and secured by a spring actuated clamping ledge 4, and a second original 8 with a part 13 of its text, such as single lines, on the outside of the drum, the original 8 being secured at each end to a roller 14, 15 and passing over a bridge block 10 freely fitting into a slot 9 at a suitable distance on the drum from the clamp 4. Guides 16 are provided either side of the block 10 which is tapered as shown and, if the whole drum is required for a single original, can be turned so that it completely fills the slot 9. Each roller 14, 15 comprises a roller 17 with slot 24 in which the end of original 8 is secured by small spring pressed pins 22 on an axle 20, a slot 21 being provided for positioning the end, and the axle 20 being then turned by a knob 26 till the pins 22 abut the edge of the slot 24, a stop 27 being provided at this position of the axle 20. The rollers 14, 15 are operated from driving wheels (not shown), extending beyond the periphery of the drum which engage gear wheels 18 so that either roller can be turned to move the original 8 across the slot 9 to present a fresh surface 13 between each copying operation. Several bridges 10 may be provided over the circumference of the drum, each having rollers 14, 15 for an original 8. In place of the clamping ledge 4, the original 3 may be clamped by a roller 17 similarly to the original 8.