Patent GB-643142-A (GB)
Title: Improvements in duplicating machines
IPC: B41L11/00
Filed: 1946-08-14
Abstract: 643,142. Copying documents; feeding sheets. FORD, R. M. Aug. 14, 1946, No. 24080. [Classes 100 (i) and 100 (ii)] A rotary mirror script duplicator comprises a main sheet-feed tray or trays for use when the whole of the matter on a master sheet is to be reproduced, and a second tray or trays for line or other part reproduction, the trays being so disposed that sheets from the trays are fed to a printing-cylinder 13 at positions spaced around the cylinder, and the angular position of the cylinder being adjustable relatively to mechanism for bringing the cylinder to rest temporarily in a correct position for feeding sheets, thus providing two different registration positions for the two sets of trays. Feed tables.-A main tray 18, Fig. 4, is movable horizontally to and from a printing- cylinder 13 and a pressure roller 17, by means of a hand-lever 29 working in a slot 36 in a plate 37, a spring-pressed sleeve 34, the end 35 of which bears against the plate retaining the lever in either the operative or the withdrawn position of the tray. Two secondary trays 75, Fig. 3, and 76, Fig. 6, for line and heading reproduction respectively are mounted side by side on brackets 73 pivoted about a bar 46, the tray 75 being movable step-by-step to print lines consecutively, and the tray 76 being adjustable parallel to the cylinder 13. Associated with each tray is a slide 85 which, when released by turning a lever 99 carrying a cam 102 engaging a roller 103 on the slide, is pressed to the left by a spring 98 whereby a nose 86 on the slide engages a rod 45 causing the tray to rock about the bar 46 and bring a pressure roller 88 into contact with the cylinder 13. The step-by-step movement of the tray 75 is effected by an escapement mechanism comprising a lever 110, Fig. 4, which is normally held in the position shown by the roller 103, and when released by movement of the slide, is rocked about a pivot 109 (not shown in Figs. 1, 3, 4 or 6) by a lever 119 oscillated by a cam on the cylinder 13, whereupon a tooth on the end of the lever 110 moves out of a notch 49 in a fixed bar 48 into a notch 61 in a movable angle plate 56 and the tray is moved to the left, Fig. 3, one tooth space by a cable 130, a constant pull on which is exerted by a balance weight 140 acting on a cable pulley 138, or by hand-crank pressure on the pulley. On return of the lever 110, a spring returns the plate 56 to normal position. A hand lever 120 can be rocked about a pivot 121 to trip the lever 119. Stopping arrangements; cylinder trips.-The cylinder 13 is retained in the position of rest by a spring-pressed lever 199, Fig. 1, carrying a roller 201 engaging a notch 184 in a boss 183 fixed to a driving sprocket 185 which is coupled to the shaft 14 of the cylinder 13 in either of two angular positions by a cap 190 keyed to the shaft 14 and carrying a pin which can be engaged in either of two angularly-spaced holes in the sprocket 185 according to which trays are in use. A cam 213 is provided for tripping the lever 199 when the sheets are longer than the circumference of the cylinder. The tray 18, Fig. 6, carries a moistener comprising a receptacle 19 from which liquid is fed by wicks 23 to a pad 21 against which the sheets are pressed by a roller 41 on pivoted spring-pressed arms 40. In the registration position, Fig. 1, a pin 43 on an arm 210 fixed to the lever 199 trips the roller 41. A moistener is provided for each tray 75, 76 and comprises a pad 148 part of which projects through a slot in a carrier plate 147 releasably clipped on to a bar 146 extending from the tray 75. Moisture is transferred from a pad 145 supplied by a wick 143 dipping in a container 142, by a wick 170 carried by a plate 162 rocked about pivots 163, not shown, on the bar 146 by a cam 71 actuated by a bar 204 on the lever 199, Fig. 1, whereby the wick 170 contacts both pads 145, 148 during printing, but not in the registration position of the cylinder 13. The copy sheets are pressed against the pad 148 by a bar 72 actuated from a bar 207, Fig. 1, whereby the bar 72 is out of action in the registration position. Specification 643,143 is referred to.