Patent GB-328257-A (GB)
Title: Improvements relating to duplicators
IPC: B41L11/00
Filed: 1929-01-22
Abstract: 328,257. Ritzerfeld, W. Jan. 22, 1929. Copying documents; addressing and like machines.-In apparatus for sectionally or line - by - line copying bookheeping entries &c, from a reversed copy, produced on the back of the sheet at the time the original is written, and on to cards &c. moistened along a transverse strip by a device which is moved across the card, the device is automatically lowered on to and moved across the card, and is then automatically raised while the card is being moved to printing position. As shown, the sheet is wrapped round a cylinder 3, which is rotated step-by-step. A card is laid on a reciprocating bed 4 so that holes in the card engage' registering-pins 6 and the strip to be printed is supported by a bar 5, the bed 4 is moved to the right, a damping-device 17 is drawn across the strip, and the bar is raised to print when it is in correct position below the cylinder 3. On the return stroke of the bed, the card is delivered from the machine by rollers 36, 40<1>, and a mark is printed on the original by means of a type on the end of an arm 58 to indicate that the line opposite to the mark has been copied. The bar 5 is arrested in printing position by stops 31, and the continued movement of the bed 4 tensions springs, which subsequently return the bar to normal position. The means for raising the bar 5 comprises pins 32 on a, bar 30 which is raised by cams 29 fixed to the bed 4. The arm 58 is pivoted to a slidable block 60 mounted in a guide 61 adjustably fixed to a cross rod 61<1>, and is rocked on the return stroke of the bed 4 by a trip lever 63 engaging a projection 59 on the arm. Where repeat impressions are required from any one line, the block 60 is shifted laterally between impressions so that a corresponding number of marks is printed. By means of a mirror 65, the line in printing position may be viewed. The cylinder 3 is rotated by a ratchet disc 53 actuated by a pawl 51 rocked by an arm 49 mounted on the shaft of the cylinder and carrying a roller 50 lying in the path of a bar 9 on the bed 4. The arm 49 acts on the pawl through a screw 54 by turning which the angular position of the cylinder may be adjusted to bring the line to be printed into exact register. A hand lever 57 may be actuated to knock off the pawl 51 when repeat impressions are required. Overrunning of the cylinder 3 is prevented by a brake band 68 tightened by turning a screw 57. The delivery rollers 36 are rotated by a pinion engaging a fixed rack, and the coacting rollers 40<1> are mounted on the ends of arms 40 fixed on a pivot shaft 39 carrying an arm 48 provided with a projecting pin 47, which, on the return stroke of the bed 4 runs up a ramp 42 and over a rail 41 whereby the rollers 40<1> are raised into operative position. By pushing in a hand lever 45, the ramp 42 may be rocked upwardly so that the pin 47 rides under the rail 41 and the rollers 40<1> remain out of action. Extensions 39<1> on the arm 40 engage the printed card and lift it off the pins 6. Printing-surfaces.-The printing-sheet has holes engaging headed studs on the cylinder 3. To fix the sheet on the cylinder, a bar provided with keyhole slots is placed over the studs and moved longitudinally. Damping-apparatus. - A damping-device 17, Fig. 3, is carried by a carriage 10 traversable on lateral rails 8<1> on a slide 8 mounted on guide bars 9 carried by the bed 4, the carriage 10 being coupled to the bed for part of its movement in either direction by means of pawls 12, 12<1>, Fig. 1, on the carriage which alternately engage a rail 11 on the bed 4, fixed cams 13, 13<1> being provided for disengaging the pawls. A cord 14 fixed to each end of the carriage 10 passes over pulleys 15, 16 and is connected to the machine frame so that as the slide 8 moves longitudinally the carriage 10 travels laterally, the connection to the frame comprising a pivoted spring-controlled lever 25 which takes up tensional changes in the cord 14. In the normal position, a pad inside the device 17 projects through a, gap into a, container 19 and engages a pad supplied with moisture trom a vessel 21. The device 17 is pivoted on the car riage 10 and is spring-pressed downwardly, and a lever 18 normally engaging under the device retains it in a raised position until its operative stroke commences when the lever is removed by a spring catch 23. A stop 24 subsequently moves the lever back and raises the pad for its return stroke. Catches and stops may be arranged at various points to provide discontinuous damping. Tripping-arrangements.-The pins 32 rest on cones 33 fixed on a shaft 34 which is moved axially to adjust the printing pressure by raising or lowering the pins. Inking-apparatus.-The type on the end of the lever 58 is inked by a pad 64 on the bed 4.