Patent GB-426058-A (GB)
Title: Improvements in or relating to record-card controlled printing mechanism
Filed: 1933-09-27
Abstract: 426,058. Typewriters &c. BRITISH TABULATING MACHINE CO., Ltd., Victoria House, Vernon Place, Southampton Row, London. Sept. 27, 1933, No. 26621. Convention date, Sept. 29, 1932. [Class 100 (iv)] Relay type-bar actions.-In record-card controlled printing-mechanism comprising a typemember which is yieldingly coupled to a reciprocating driving-member and is differentially arrested under control of the reading- device, the type-member, after arrest, is coupled under control of the reading-device to an additional reciprocating driving-member arranged to move the type-member differentially in the opposite direction to the main driving-member. The record-cards may be perforated, or have marks for controlling light-sensitive devices. In the mechanism shown in Figs. 4, 4<a>, each type-bar 37 is connected by a link 38 to a spring-urged rocking arm 39 co-operating with a universal bail 44 which is connected by links 43 to rocking arms 45 operated by cams 50 on the printing-shaft 36. The typebar has stops 51 co-operating with a stoppawl 52 which is normally restrained by a latch 61 connected to the armature 59 of a magnet 57, connected to one of the lower reading-brushes. The type-bar is now provided with teeth 53 for co-operating with a pawl 54 on a cross-head 64 which can slide on posts 65 and is connected to rocking arms operated by cams on a shaft 70 geared to the printing-shaft. The pawl co-operates with a restoring-bail 75 which is pivoted at 76 to the crosa-head and has a part co-operating with a cam 78 on the shaft 70. A latch 80 for the pawl is pivoted on the cross-head and co-operates with a lug 87 on the latch 61. The latch 80 co-operates also with a shoulder on a sliding plate 81 which is mounted on the cross-head and engages a forked lever 82 operated by a cam 85 on the shaft 70. When the cross-head descends, the plate permits the latch 80 to hold the pawl until it is released by means of the latch 61. A recordcard is fed from a stack during alternate cycles of the machine, a pinion for driving the feed-rollers and picker being provided with a one-revolution coupling controlled by a magnet which is energized during alternate cycles. The printing-shaft 36 makes one revolution for each card that is fed. When a numeral is printed, the type-bar is arrested by means of the stop-pawl 52 when the magnet 57 is energized under control of one of the holes 0 .. 9. When a letter is printed, the type-bar is arrested by the stop-pawl under control of one of the holes 1 .. 9, and subsequently the magnet is re-energized under control of one of holes R, X, O. Thereby, the pawl 54 is permitted to engage one of the teeth 53, and the type-bar is coupled to the descending cross-head and is moved downwards one, two, or three steps to select the required letter-type. A restoring-bail 103 for the stop-pawls 52 is connected to a belt-crank operated by the shaft 70. A restoring-bail 111 for the latches 61 is connected to a toggle 114 in connection with a link 116 which is operated by the cam, and is returned by a spring-urged bell-crank 119. Hammer - impression arrangements.-Hammers 89, Fig. 4, and an operating-bar 90 therefor are pivoted on a rod 91, the bar being connected by links 92, 95 and a lever 93 to a lever 96, Fig. 4<a>, having a roller 98 and a block 99 which co-operate with a cam and a block thereon. The cam retracts the hammers and tensions a spring 102, and when the block is tripped, the hammers strike the types 55.