Patent GB-656485-A (GB)
Title: Improvements in and relating to record card-controlled interpreters
Filed: 1948-07-01
Abstract: 656,485. Record-card-controlled printing machines. BRITISH TABULATING MACHINE CO., Ltd. July 17, 1948, No. 1742. Convention date, July 1, 1947. [Class 100 (iv)] A record card controlled interpreter similar to that described in Specification 374,960, [Group XIX], having a main sensing station for sensing data to be printed on the record cards, comprises means to set type carriers according to the data sensed, a supplemental checking station which together with the type carrier settings sets up checking circuits which indicate that the setting of the type is in accord with the data sensed, and means for separating the incorrectly matched record cards from the others. The machine differs from that described in Specification 374,960, [Group XIX], in that it includes the supplemental sensing station comprising bushes 31c and common 32c positioned six points in the machine cycle behind the main sensing brushes 31 and roller 32 and before the printing position comprising the type 73 and an impression roller 81. The machine includes a printing suppression mechanism, and interconnected therewith a deflecting finger 103 which either directs correctly printed record cards below a light flexible spring 102, Fig. 7, between guides 100, 101 and into a hopper 43 or directs record cards-which have not been printed due to incorrectly positioned type carriers-above the spring 102 so that they are directed into a separate hopper 43a. The finger 103 is attached to one oscillatable bar 75 pivotally carrying the hammers 72 and remains in its anticlockwise position shown in Fig. 1 when printing is suppressed but moves to the position shown in Fig. 7 if printing takes place, the record card being deflected above or below the spring 102 respectively. In operation the record cards are picked from the hopper 24 and led by feeding rollers 30 to the main sensing brushes 31 which effect operation of the type carrier selecting magnets 58 releasing a pawl 59 which engages the appropriate notches 60 in the carrier bars 45, thus positioning the type 73 in printing position. At the same time contact springs 92 (one fixed on each type bar) make contact between individual contacts 92 and one of a series of ten contact bars 94 extending transversely of all type bars. These contacts each form part of the checking mechanism and partly complete circuits (see Fig. 9) comprising a distributer E, contacts 94, 92, a series of column relays R3 and the brushes 31c of the supplemental sensing station. If now the data on the record card allows contact between the brushes 31c of each column and rollers 32c and the type bars in each column have been correctly positioned, the relay R3 of each column operates. If the relay R3 in every column operates, a relay R4 operates which breaks a circuit to the printing suppression magnet 89. If relay R4 does not operate then at the appropriate time in the machine cycle, cam contacts CC6 close and energize magnet 89. Magnet 89 suppresses the printing stroke by pivoting an arm 85, Fig. 1, which positions an attached member 86 below a lug 80 on a cam 78 which operates the printing hammer 72 against the pull of spring 76 by means of a follower 77a. When the follower reaches the high point of the cam 78 moving the hammer anti-clockwise, it would normally then drop rapidly to the low point of the cam allowing the spring 76 to actuate the hammer 72, but in the case of operation of magnet 89 the follower 77a is prevented from descending so that no printing takes place and the finger 103 remains in its anti-clockwise position. Specification 535,740 also is referred to.