Patent GB-343245-A (GB)
Title: Improvements in or relating to printing machines
IPC: B41L47/46
Filed: 1929-12-19
Abstract: 343,245. Printing-machines. ADDRESSOGRAPH CO., 901, West Van Buren Street, Chicago, U.S.A. Dec. 19, 1929, No. 38976. Convention date, June 10. [Class 100 (ii).] Addressing and like machines; cylinder machines. -In machines wherein a number of printing-devices are fed successively to the printing position and print on a single sheet, each printing-device has a number of type-lines and is automatically shifted to cause the type-lines to be presented to the impression mechanism in predetermined sequence. The sheet may be provided with feeding means for causing the type-lines on a printing-device to be printed in alignment. In the machine shown in Figs. 2, 3, and 8, a printing-plate A having four type-lines is fed on to a bed 42, and is engaged by a member G which is automatically shifted to bring the type-lines into printing position in any desired sequence, and a carriage B for a sheet is automatically moved to cause the type-lines to print in alignment on the sheet. The printing-plates are stacked in a magazine 40 and are fed on to the bed 42 by a reciprocating feed bar 43, Fig. 3, having pawls 44 for engaging the rear edges of the printing plates. The feed-bar is connected by a link 49 to a bell crank 48 co-operating with a pivoted trigger 51 on a bell crank 44<11> connected to an arm 371 on a rock-shaft 16. The trigger is controlled by a rod 54 connected to a rocking arm 58 operated by a ratchet wheel 53 having at intervals of four teeth deep notches 53<1> for permitting the trigger to engage the bell crank 48 and transmit movement to the feed-bar once during four cycles of the machine. An impression arm 15 rocking on the shaft 16, and provided with a slide 20 carrying an impression roller 19, is rocked by means of a cam 13<1> on a rocking arm 13, the impression roller being traversed over the sheet by means of linkage including a toggle 29, 30. The toggle arm 30 is connected to a link 31 on the impression arm, and the toggle arm 29 rocks on the shaft 16 and has a finger 29<1> engaging a gap in a collar 35 on the shaft. The toggle is connected by a link 27, rocking arm 22, and link 23 to the slide 20. When the impression arm descends, the toggle effects traverse of the impression roller, the movement being completed by a spring 32 which carries the toggle over the dead centre. The carriage B is provided with a guide 95 and feed rollers 96, 97 for the sheet, and can slide on guides 70. The carriage is connected by a belt 73 to a drum 71 associated with a stepfeed device for advancing the carriage comprising a disc 121 connected to the drum and having three notches 122, Fig. 8, co-operating with a pawl 115 and a detent 125. The pawl is carried by a rocking arm 112 connected to a rack 116 engaging a sector 117 connected to the impression arm. The member G is provided with a cam 81 engaging a roller 82 on the carriage B, engagement being maintained by a spring 84. The cam has steps for causing, for instance, the fourth, third, first, and second type-lines to be positioned successively beneath a slot 67 in a guard-plate 66 for the inkribbon 65. The cam 81 may be replaced by an arrangement comprising a stepped cam on the drum 71, and a co-operating lever connected to the member G. The member G has notched spring- fingers 76 for engaging a bead on the top edge of the printing-plate, or if printing-plates having flat edges are employed, the spring fingers have bevelled ends for engaging the top and bottom edges. After use, the printing-plates drop into a drawer 79, Fig. 3, and are packed by an arm 80. When the impression arm descends to print the fourth typeline, the pawl 115 is retracted idly into engagement with an abutment 124<1> and on return of the impression arm the pawl co-operates with one of the notches 122 to turn the drum, the carriage being moved and the member G being shifted to bring the third type-line into printing position. Similarly, during the second and third operation of the impression arm, the third and first type-lines are printed, the carriage is moved twice, and the first and second type-lines respectively are brought into printing position. During the fourth operation of the impression arm, the second type-line is printed and the drum is released by means described below, thereby permitting a spring 74 to return the carriage to initial position. The feed roller 97 is geared to a ratchet wheel 102 co-operating with a pawl 104 on a rocking arm 103, and at the end of the return movement of the carriage, the arm abuts on an adjustable stop 106 and the feed rollers are turned to line-space the sheet. The releasing means for the drum 71 comprises a loose disc 126 having a notch 130 for receiving the pawl 115. The disc is initially in the position shown in Fig. 8 and during the first operation of the impression arm is turned by a spring 129, Fig. 2, to carry the notch slightly beyond the abutment 124<1>. During the second and third operations of the impression arm a pin 128 on the disc 121 engages a pin 127 on the disc 126 and the notch is moved slightly in front of the abutment. During the fourth operation of the impression arm the pawl enters the notch 130 and turns the disc 126, until the pawl engages and releases the detent 125 thereby permitting the carriage to return in the above-described manner.