Patent GB-715011-A (GB)
Title: Improvements in duplicating machines
Inventor: FORD RONALD MAX
IPC: B41L11/00
Filed: 1949-12-30
Abstract: 715,011. Copying documents. FORD, Ltd., F. R., and FORD, R. M. Dec. 27, 1950 [Dec. 30, 1949], No. 33318/49. Class 100 (2) In a duplicating machine of the kind having a frame in which is mounted a cylinder to which is secured a master sheet having the matter to be reproduced in reverse, the machine also comprising moistening means for the copy sheets, a feed tray for the copy sheets and a pressure roller to press the moistened copy sheets into contact with the master when the cylinder is revolved, there is provided an element which can be moved parallel to the axis of the cylinder and which has movably mounted at its forward end a plurality of further pressure rollers of different lengths which are individually movable towards the cylinder for pressing a copy sheet or card against the master, and a secondary feed tray supported on the machine above the element and independently of the element, said feed tray being movable along the entire length of the cylinder. The machine is of the general construction disclosed in Specification 643,142, having as therein described a main feed tray for copy sheets for full width reproduction. For use for the reproduction of se!ected matter on narrower copy sheets, a secondary tray 73 is mounted to be movable axially of the cylinder by means of rollers 76 engaging a fixed plate 74, the tray having a latch engaging notches in a bar secured to a bracket 78 on an element 15, to lock it in a desired position. Mounted on two separate pivoted levers 21 on the element 15 are two pressure rollers 17 of different length, one twice as long as the other, which can be selectively moved into the operative full-line positions by means of rods 26 manually movable into cammmg engagement with portions 23 of the levers 21. The element 15 is pivoted to the machine frame 11 on a shaft 13 and is held in a tilted position with the roller or rollers 17 which is or are in operative position in contact with the cylinder by means .of an enlarged portion 38 of a cam bar 30 pivoted to the frame. The bar 30 has a mechanical connection with the cylinder registration lever so that when the cylinder is in registration position and a roller on the said lever drops into a notch on the registration disc, the bar is oscillated, and a flat on the portion 38 allows the element 15 to drop to withdraw the pressure roller or rollers to the position shown, by means of an adjustable lever 41 pivoted to the element. Also pivoted on the element is a lever 44 having a screw 45 engaged by a bar 46 carried on arms 7 fixed on the bar 30, and having a spring pawl 47 engaging in notches in bars 51 or 52, bar 51 being secured to the fiame 11 and bar 52 being mounted on bar 51 by screws 5 and slots which allow the bar 52 to slide under the action of a spring or of the pawl the distance of one notch. The element 15 is urged in one direction axially of the cylinder by means of a weight, its brackets 14 sliding on the shaft 13. When the cylinder reaches registration position, the bar 46 allows the lever 44 to rock to bring the pawl into engagement with a notch in the bar 52, whereupon the weight moves the element axially one notch. When the cylinder moves out of registration position, the pawl engages a notch in the bar 51, and the bar 52 is returned by its spring, so that the element moves one notch each cylinder revolution. If a slide 71 on an arm 66 is moved to bring a screw 72 clear of a stop bar 50, a handlever 65 can be depressed far enough to bring the pawl clear of the bars 51, 52, and the element can then be moved manually. A sight 104 divided to correspond with the lengths of the rollers 17 is provided on the moistening unit 103 to facilitate correct alignment of the element for reproducing selected portions of the master sheet. A pair of guide wheels mounted on the element contact the cylinder to prevent skewing sideways of a copy sheet. Moistening means for the copy sheets is described and claimed in Specification 715,019.