Patent GB-292121-A (GB)
Title: Improvements in address printing machines
IPC: B41L47/58
Filed: 1928-05-29
Abstract: 292,121. Adrema Maschinenbauges. June 14, 1927, [Convention date]. Addressing-machines ; tripping-arrangements. -In addressing-machines of the type wherein the printing-plates are provided with projections for selectively operating one or more of a series of switches, which control the energization of an electromagnet adapted, in turn, to control the printing operation, the switches are in parallel with each other and in series with a, normally open main switch, and are all closed until or just before the printing-plates arrive at the printing position, whereupon all the switches which are not locked in their closed positions by the projections on the printing-plates are opened, the main switch being closed at the same timer as or immediately after the other switches are opened. As shown, the machine is of the type comprising a guideway 2, Figs. 1 and 2, along which printing-plates 3 are advanced in succession by a slide 5 to printing position 7 beneath a printing-platen 10 carried by an oscillating arm 8, the movement into operative position of the platen being under the control of an electromagnet 12, the circuit of which is controlled by a series of switches arranged in side-by-side compartments at the printing station 7. Each switch comprises two conducting plates 16, 17, Fig. 12, insulated from each other and provided with pivoted contact arms 20, 22 respectively, the arm 20 being spring-pressed towards a stop 16<11>, and the arm 22 being hooked round a stop 17<11> and pressed upwards by a spring 23 to engage an arm 25 of a. bell-crank pivoted at 27. The arm 25 is normally held down to close the whole series of switches by a segmental shaft 30, to one end of which is fixed an arm 32, Fig. 6, adapted to be engaged by a lug 38, Fig. 2, on a reciprocating rod 39 connected to the end 8<1> of the arm 8, whereby the shaft 30 is rotated until the fiat side faces the arms 25 and the bell cranks are released. Projections 14, Fig. 1, are provided on each plate 3 near one side edge, and these obstruct the vertical arms 26 of certain of the bell cranks and retain the corresponding switches in the closed position while the remainder are opened. The actual selection of the plates 3 from which impressions are required is made by pressing push-buttons 13<1> on a switchboard 13, Fig. 1, each push-button being in series with a switch. On the end of the shaft 30 opposite to that which carries the arm 32 is fixed an arm 41, Fig. 8, which, immediately after the other switches are opened, closes a main switch comprising conductor plates 42, 43, the former carrying a fixed contact 45, and the latter a spring contact 44 adapted to be engaged by the end of the arm 41. The shaft 30 is held against returr. by a catch 35, Fig. 6, engaging a latch 33 or. the shaft, and the latch is subsequently engaged by a pin, on a reciprocating bar 48 fixed to the feed slide 5 to release the shaft 30 and allow it to return under spring action. A device for locking the shaft 30 in the position in which the selective switches are closed comprises a pivoted lever 53, Fig. 6, which is moved by means of a handle 54 so as to engage behind the arm 32.