Patent GB-470289-A (GB)
Title: Platen mechanism for addressing or like series printing machines
IPC: B41L47/46
Filed: 1936-04-02
Abstract: 470,289. Addressing and like machines. ADDRESSOGRAPH CO. April 2, 1936, No. 9745. Convention date, Feb. 12. [Class 100 (ii)] In impression arrangements comprising a roller platen carried by toggle-links and arranged to travel in a plane parallel to the printing-plates, the roller platen is so controlled that predetermined parts of the printing- plates can be skipped. In the preferred arrangement, a segmental roller platen is angularly adjustable to determine the initial point of engagement with the printing-plate, and adjustable stops for raising the togglelinks determine the final point of engagement. In the addressing-machine shown in Figs. 1 and 2, a roller platen 40, having a segmental impression-surface 45, is revoluble on a shaft 42 mounted in arms 44 suspended from a shaft 48 which is suspended by arms 47 from a shaft 49 mounted in a carriage C. The platen is normally held in raised position, as shown in Fig. 4, by means of spring-urged arms 51 which are mounted on a shaft 50 on the carriage and engage bushings 43 on the shaft 42. The carriage is provided with upper and lower rollers 67, 66 engaging rails 30 on framemembers 20a, 20b, and is reciprocated by means of links 37 in connection with rockarms 33 operated by an eccentric 31. The printing-plates D are stacked between the frame-members. To permit adjustment of the platen, the shaft 49 is journalled in bushings 59 each having a pin 60 engaging a recess 61 in a yoke 62 having a threaded stem 63 engaging a threaded adjusting-sleeve 64 on the carriage. Further adjustment can be effected by means of the rails, these being mounted at the rear on pivots 68 and provided at the front with adjusting-eccentrics and clamp-screws. For rotating the platen, the shaft 50 is provided with a loose pinion 90 which engages a rack 89 on the frame-member 20b and is connected to a pinion 92 in engagement with a pinion 93 on the platen. When the carriage approaches the front position, pivoted arms 73 on the rails 30 are rocked by means of the front rollers, and forks 77 in the arms co-operate with pintles 76 on the shaft 48 to rock the arms 47, 44, 51 and thereby depress the platen into sheet-engaging position. In this position, the arms 47, 44 are in alignment, the tops of the arms 44 abutting on shoulders on the arms 47, and alignment being maintained by the spring-urged arms 51. During return of the carriage, the platen rolls over the sheet until the pintles 76 engage stops 100, 101, and the arms 47, 44, 51 are thereby caused to raise the platen into the position shown in Fig. 4. During further movement of the carriage, the pintles clear the stops, and the platen can rise further, until a sleeve 102 on the shaft 48 comes into engagement with abutments on the carriage. To permit skipping of one or more of the last lines on the printing-plate D, the stops are adjustable to cause the platen to rise after a predetermined number of lines have been printed. The stops are secured in adjusted position by means of screws 104. To permit skipping of one or more of the first lines on the printing-plate, the platen is released by pulling out the shaft 42, and is then re-set with reference to the pinion 92 to determine the initial point of engagement of the segment 45 with the printing-plate. The shaft is maintained in normal position by means of a releasable latch 97. To disconnect the platen if an obstruction such as the operator's fingers is met when the platen is being depressed, the links 37 are formed with notches 36, having sloping front walls, engaging pins 35 on the arms 33, engagement being maintained by springs 39. If the platen is obstructed, the pins slide down the front walls of the notches, and the platen is disconnected during one stroke of the machine. The shaft 42 is provided with an auxiliary platen 110 for printing dates &c. from a plate 111. Specification 470,290 is referred to.