Patent GB-311330-A (GB)
Title: Improvements in duplicating apparatus
IPC: B41L23/12
Filed: 1929-05-03
Abstract: 311,330. Ritzerfeld, W. May 9, 1928, [Convention date]. Copying documents, drawings, and the like; printing-apparatus combined with paper-damping apparatus; printing. surfaces. - Relates to a duplicating-machine employing a printing-sheet of the kind comprising a paper sheet having a reversed copy of writing &c. on the face of the sheet formed in copying-ink on the back of the sheet. On rotation of a printing- roller on which the original is mounted or in contact with which it is led, a sheet to be printed is drawn through the machine, a damping-device is automatically displaced into contact with the sheet to be printed, and damping, printing, and delivery of the sheet are effected. The sheet may be stretched over a roller 2, Fig. 2, with the copy on the outside, and copy sheets, or, alternatively, a web, previously moistened by means of a damping-pad 11 are fed between the roller 2 and a pressure roller 3, the roller 2 being rotated by a hand crank or by power. The damping pad 11 is pivoted at 11<1> and is pressed by springs 11<2> into the plane of a feed table 41. A pivoted arm 13 fixed to the pad casing is periodically rocked by a rotary cam 12 fixed to the roller 2 to raise the pad 11 off the copy sheet. When a web is to be printed, the arm 13 is moved into a position where the pad 11 rests continually on the web, and also when the printing-sheet is greater in length than the circumference of the roller 2, in which case the printing-sheet is placed over the pad 11 and passes together with a copy sheet between the rollers 2, 3. A damping-fluid is supplied from a vessel 40. The ends of the printing-sheet wrapped round the roller 2 are secured by clamping-bars 19, 20, Fig. 6, conforming with the periphery of the roller, and the bars are movable radially and are provided with guide pins 23 engaging holes in lugs 22 extending from a guide. Either bar 19 or 20 may be raised by turning a hand lever fixed to a shaft 25 provided with arms 27, 28. The arm 27 is so engaged with a lug on the bar 19 that the bar remains in the raised position until the shaft 25 is turned back, but the bar 20 is immediately returned by a spring coiled round the pin 23 when the shaft is released. Stopping, starting, and tripping arrangements. -When the roller 2 is rotated by power, a one-revolution clutch is provided comprising a springed-pressed pawl 35, Fig. 4, on the roller 2 and a ratchet disc 30 fixed to a driving-gear 31. The machine is started by depressing a lever 38 connected to a link 37 adapted to rock a cam lever 34 about the axis of the roller 2 and to release the pawl 35 which thereupon engages the ratchet 30 and couples the roller to the drive. After one revolution, the lever 38 having returned to normal position, the cam 34 lifts the pawl 35, and the roller is locked in normal position by a roller 17, Fig. 2, mounted on an arm 18 and engaging a recess 17 in the cam 12. The position of rest of the roller 2 may be altered to register the impression with lines on the copy sheet by adjusting the cam 12 angularly with respect to the roller 2. The impression roller 3 is mounted for pressure adjustment in eccentric bearings rotated by turning a handle 7, Fig. 2, carrying a spring-pressed ball adapted to engage one of a series of recesses arranged in a segment fixed on the machine frame. The ends of the roller may, in addition, be separately adjusted by turning eccentric studs 10 on which are mounted arms 5, 6 supporting the roller bearings. The Specification as open to inspection under Sect. 91 (3) (a) comprises also (1) a stop-pin in place of the roller on the arm 18, this pin being removed automatically when the lever 38 is rocked, and (2) an impression roller mounting comprising at each end of the roller shaft a bearing 46, Fig. 7 (Cancelled), adjustable in a frame 45 by means of screws 47 and clamping-plates 48. This subject-matter does not appear in the Specification as accepted.