Patent GB-695127-A (GB)
Title: Improvements in or relating to printing machines, particularly card controlled printing machines
IPC: B41J2/23
Filed: 1950-09-14
Abstract: 695,127. Record-controlled printing-apparatus. BURROUGHS ADDING MACHINE CO. Sept. 14, 1950 [Sept. 27, 1949], No. 22650/50. Class 100(iv) [Also in Group XIX] A printing-machine comprises characters made up df a number of separate elements which are movable to and from print positions by rotary means such as shafts 59 and 60, Fig. 7, or shaft 65, Fig. 7a, engaging with interposers 51 selectively held for engagement with the shaft by a series of character-identifying devices, shown as electromagnets 38. Printing is effected by printing heads 35, Fig. 1, each formed of thirty-five wire printing elements as described in Specification 674,343, and in the machine shown three such heads are mounted on each of seventeen upper sections 32 of panels 18. The panels 18 are of varying lengths so that they extend to seventeen print selector units 17 carried on shelves 16 fitted in between main walls 15. The shelves each have a cutaway portion 19 of decreasing size according to the number of panels having to pass therethrough. The longest panel is shown on Fig. 3 and comprises the upper section 32, two depending rods 26 assembled with spacing tubes 31, and guide members 27 through which pass rods 29 resiliently connected at their upper ends to the flexible wire printing elements 42. At the lower ends the rods are pivotally connected to a series of interponents 51, Fig. 7, in the print-selector units 17. The units 17 rest on transverse members 23 on the shelves 16 and comprise side walls 21 having upwardly extending portions into which the rods 26 are screwed, and a base 55 with cross pieces 48 on which are assembled the cores 49 of print selector magnets 38. The armatures 50 of the magnets 38 are coupled to connectors 52 guided by a forward comb 57 and by an underslung extension 53 sliding in a comb 56. The extensions 53 are of various lengths to suit the staggered arrangement of the magnets 38. The connectors 52 are coupled by a slotted connection to the interposers 51 which are all cyclically moved rightward, Fig. 7, by a cam-actuated bail 58 of a rocking member 67. After all the interposers 51 have been moved to the right a record card is sensed and in accordance with electrical circuits identical with those described in Specification 692,096 the appropriate magnets 38 are energized and thus hold in rightward position certain of the interposers 51 while the others return with the return movement of the bail 58 under power of the armature springs 49a. The held interposers are now engaged by the continuously driven shaft 59 having a projection 61 which engages a shoulder 62 on the interposers and effects an upward printing stroke to certain of the rods 29. An oppositely rotating shaft 60 effects return of the rods and by now magnets 38 are de-energized ready for the next cycle of operation. The shafts 59 and 60 are geared together and to cams 124, Fig. 1, which through rollers 125 of followers 126 effect the rocking of the member 67 and bail 58. The shafts of each print unit 17 are coupled together by bevel gearing and shafting 130, 133, 134, 136, 137, 139, 140, 142, 143, 144, 145. In a modification the shafts 59, 60 are replaced by a single shaft 65, Fig. 7a, which has a projection 61a engaging a shoulder 62a on the interposers 51a, and a cam 63a engaging firstly link 66 pivotally and slottedly connected to the interposers 51a which are thus moved downwardly to effect a return stroke and, secondly, engaging the edge of the interposer itself and moving it leftwardly into its initial position. Electrical circuit arrangements as described in Specification 692,137 may be incorporated in the machine for the suppression of the printing of zeros.