Patent GB-670465-A (GB)
Title: Improvements in duplicating machines
IPC: B41L19/06
Filed: 1949-10-10
Abstract: 670,465. Copying documents; feeding sheets. FORD, R. M. Oct. 10, 1949, No. 25913/49. Addition to 643,142. Classes 100 (i) and 100 (ii). In a duplicating machine of the kind described in the parent Specification, each secondary tray is moved pivotally to bring its pressure roller into contact with the cylinder and allowed to move pivotally to bring its pressure roller away from the cylinder by means of an oscillating shaft operated by a mechanical connection to the cylinder registration means. Two secondary trays 14 and 15, Figs. 4 and 6, are adjustable laterally of the cylinder 11, the former tray 14 operating in the same manner as the corresponding tray in the parent Specification. Supports 20, Fig. 6, of each of the secondary trays are provided with a bracket 18 mounted on a bar 19 connecting side members 10 of the frame. Each support 20 is provided with a bracket 21 at the rearward end carrying a pressure roller 22 movable into contact with the master sheet on the cylinder. This movement is produced by an oscillating shaft 23 having a flat 24 which engages the underside of a lever 25 pivoted at 26 to a bracket 27 on the underside of the support 20, a spring 28 being interposed between the support 20 and the lever 25. The shaft 23, Fig. 1, is oscillated by a lever 44 having a pin 45 engaging in a slot 46 in a lever 33. The lever 33 is pivoted at 37 on one of the plates 10 and is acted on by a spring 38, such that a roller 34 carried on the lever is held in engagement with a disc 36 secured to the cylinder shaft. When 'a notch 35 in the disc 36 passes the roller 34 the lever 33 is rocked to cause the roller 22, Fig. 6, to move away from the cylinder 11. Each of the supports 20, Fig. 6, carries a damping member 29 pivoted at 30 and actuated by a cam 31 having a lever 41, Fig. 1, provided with a projecting pin 42 engaging a slot in the lever 33. A spindle 40, Fig. 1, of the damping roller used for sheet reproduction is also moved when the lever 33 is rocked. The shaft 23, Fig. 6, may be provided with portions 47 of reduced diameter and without flats so that when the trays are above these portions they are not rocked. Moistening means for each tray comprises a liquid container 76, Fig. 1, a pipe 77 enclosing wicks 78, Fig. 6, which feed liquid to an absorbent member 81 having a depending portion 82, and a second absorbent member 88 normally urged into contact with the member 81 by a spring 89, the members 81 and 88 being separable when the machine is out of use by rocking a lever 86. The lever 86 may be rocked by a pin 92 carried on adjustable brackets 91. Feed tables.-The tray 14, Fig. 6, is given an automatic step-by-step movement axially of the cylinder 11 by a means similar to that described in the parent specification, and which incorporates a reciprocating rack 17 spring-loaded towards the right hand end of the machine, and a stationary rack 16. A ratchet tooth 54 pivoted to a lever 50 is disengaged from the rack 17 and brought into engagement with the rack 16 when the lever 50 is rocked through an adjustable screw 51 by a bar 52 mounted between cranks 53 secured to the shaft 23, so that when the reverse movement takes place the tooth 54 re-engages the rack 17, such that the tray 14 under the tension of a cable 55 is moved one step to the left-hand end of the machine. The lever 50 is provided with a finger-piece 56 so that it can be rocked downwardly by hand to bring the tooth 54 clear of both racks 16 and 17 to permit free lateral movement of the tray 14. A member 58 bearing rows of figures corresponding to the lines on the master co-operates with a mask 59 having an opening 60 on the support 20 to indicate which line will be produced on a card passed over the tray 14. The tray 14 may be provided with a slide 61, Fig. 6, engaging a guide 62 secured to the support 20 such that the tray may be retained frictionally in any position along the guide 62. The rearward end of the tray may have a shield 63 under which cards are passed. The tray 15, Fig. 4, is mounted on a support 64 movable along the bar 19 and having a lever 65 which can be engaged in one of two notches 66 in a bar 67, the lever 65 being pivoted to a block 69. The tray 15, which is spring-loaded by a spring 70, may be locked in position along a rack 75 by a spring-loaded lever 73.