Patent GB-239607-A (GB)
Title: Improvements in or relating to record-card-controlled statistical machines
Filed: 1924-06-13
Abstract: 239,607. Campbell, C., and British Tabulating Machine Co., Ltd. June 13, 1924. Statistical machines comprise in combination a designation-reading device, a statistics-reading device, registering or recording mechanisms each having a connection with the statistics-reading device, and selecting means operatively joined to the designation-reading device for selectively rendering one or other of the connections operative in accordance with the designation, for example one of two perforated designation or control holes signifying credit and debit. The invention is described as applied to an electrically-controlled printing statistical machine similar in its mechanical parts to that described in Specification 216,142, and in which itemregistering, item-printing, and total-printing are controlled by mechanism described in Specifications 183,867, 190,144, and 216,142. The cards are fed past upper and lower reading brushes 14, 34 spaced one card cycle apart and controlling card levers GL and contacts 9, 9<a> and 31 in a similar manner to that described in Specification 190,144 (Fig. 3). Depression of the start key 2 closes a circuit L, stop key 1, motor relay 3, card-feed clutch magnet 4, motor TM, and R. Attraction of the armature of magnet 3 shunts the start key through contacts 9 or 6. Contacts 7 shunt both keys 1 and 2 and open after contacts 6 in order to pass the last card through the machine. Just prior to the opening of contacts 7, contacts 8 close momentarily to de-clutch the card-feed. Debit is represented by a hole at No. 1 index point in the designation column and credit at No. 5 in the same column; 36, 36<a>, Fig. 4, are the debit counter-magnet windings and 136, 136<a> those for credit. The designation contact block 14<a> is connected to a rotating contact arm 100 geared to the card-feed mechanism so that when the index point No. 5 or No. 1 is under the brush this arm 100 contacts with studs 115 or 15 respectively. The arm 100 and disc 101 are diagrammatic; suitable constructions of selectors such as those shown in Specifications 197,073 and 205,863 may be used. This stud 15 (or 115) is in series with a magnet 17 (or 117) and normally closed contacts 18 (or 118), the magnet controlling the contacts 18 and normally open contacts 18<a>, Fig. 3, in a similar manner to that described in Specification 190,144 (Fig. 11) so that when 17 is energized, bell-crank 140 is unlatched to open contacts 18 and close contacts 18<a >(or 118<a>). If, therefore, there is a " 1 " hole (debit) in the designation column, a circuit 14, 14<a>, 100, 15, 16, 17, 18, E<11> is closed, and energization of 17 closes 18<a>; this energizes a magnet 28, which attracts its armature 38 and completes a circuit from 34<a>, 35, debit magnets 36, 36<a>, and contacts 38, 39, G'. The armature 38 (or 138) is connected to the lead from the magnets 28 (or 128 in the case of credit) to the contact 18<a> (or 118<a>). Current, therefore, flows from G through magnet 28, to contacts 38, 39, G<1>. After the last index point has passed the brush 14 the arm 410, Fig. 3, is relatched by cam 412, contacts 18<a> are opened and 18 are closed. Subsequently while the second card is being read by the brush 14 the first card is being read by the brush 34 and the statistics thereon are registered on the counters 36, 36<a> which were previously rendered receptive. Instead of using two card-reading devices 14, 34 as above, a delay-action device such as described in Specification 215,842 may be used. For straight tabulating the debit and credit magnet circuits may be short-circuited by switches 41, 141. In a modification the two card-reading devices are at the same point in the path of the cards, and are constituted by a single row of reading brushes. In this case the designation hole (e.g. debit or credit) occupies the " leading " position in either of two separate columns, instead of one of two positions in the same column. The invention is also applicable for use with code cards of the Peirce type.