Patent GB-447485-A (GB)
Abstract: 447,485. Calculating - apparatus. BURROUGHS ADDING MACHINE CO., 6071, 2nd Boulevard, Detroit, Michigan, U.S.A. Nov. 19, 1934, No. 33231. Convention date, Nov. 20, 1933. [Class 106 (i)] A machine with printing mechanism and relatively movable paper-supporting means is provided with a designation mechanism requiring the manipulation of a selecting member to release a part of the machine for operation and with automatically controlled means for rendering the designation mechanism active or inoperative in accordance with selected columnar printing positions. The invention is shown applied to a Burroughs machine of the type described in Specification 285,885, [Class 106 (i)], the designation control being applied to the motor drive. The machine is given a stroke of operation by throwing in a one revolution clutch by the action of a control link 22, Fig. 1, on the depression of the motor bar 27. A bank of designation keys 50 is provided ; this bank is similar to the other banks and is associated with a type bar for printing designation characters. The designation bank of keys may be used for other purposes and in the embodiment shown, serves to control the selection of the multiple lower registers by known means. The keys 50 co-operate with a slide 53 having a lug 60 engaging under a projection on a pivoted arm 62 which may be the usual zero stop. The arm carries a stud 64 over which is hooked one end of a link 65, the other end of which is connected to a spring-controlled bail 44. When one of the keys 50 is depressed, the slide 53 is moved rearwardly and raises the link 65 to rock the bail 44. An arm 43 of the bail has connected thereto a link 40 with a lateral projection 41 which normally overlies a stud 42 on the link 22 and thus prevents the link being raised to start the machine operation unless the link 40 has been moved by the mechanism above described on depression of a designation key 50. The displacement of the link 40 may be effected automatically under the control of the paper carriage so that in certain column positions the machine may be operated without depressing a key 50. For this purpose the rear end of the link 40 is connected to a pivoted arm 70, the shaft of which carries a second arm resiliently connected to a lever 73, the rear end of which is pivotally attached to a vertically movable slide 80 having a pin 85 that co-operates with a cam 86 adjustably mounted on the carriage. In another embodiment shown in Fig. 4, several banks of keys may be employed as designation controls while the mechanism preventing operation is normally inoperative and is rendered effective in predetermined column positions. In this form, the zero stop arm 62 of each designation bank is connected to a link 107, Figs. 4 and 5, the lower end of which is pivoted to a latch 105 normally preventing a rocking movement being imparted to the bail 101. The bail is operatively connected to a link 90, the rear end of which has slots 92 in which operate pins 93 on a member resiliently connected to the link 90 by means of a spring 95 and pivoted on the end of an arm 94. The link 90 has a lateral projection 91 which is normally ineffective, but when the paper carriage arrives at a predetermined column the cam 86 through the slide 80 and lever 73 rocks the arm 94 and displaces the link 90 so that the projection 91 overlies the stud 42 on the link 22. In this column position a key in each of the designation banks must be depressed to raise the latches 105 whereupon the spring 95 moves the link 90 to its extreme forward position to free the link 22.