Patent GB-954492-A (GB)
Title: A typewriting accounting machine
Inventor: GULDNER HARRY
IPC: G06C11/04
Filed: 1960-06-24
Abstract: 954,492. Typewriters &c. BUCHUNGSMASCHINENWERK KARL - MARX - STADT VEB. June 24, 1960, No. 22203/60. Heading B6F. An accounting machine, has the usual numerical type-bars N, but in addition, has an horizontally-arranged type-wheel 142, Fig. 5, settable by power in either direction and adjustable by power to different heights to position either of the two rows of letters and other characters in printing position, the typewheel 142 being arranged on a type-carrier 114 and set by bails 53, Fig. 6, associated with a group of key-slides 4, and setting latches 58 swung into the path of a type-wheel setting slider 49 provided with stops 67, 68, 69 and actuated by a setting control mechanism 35, 40, 38, 39, 47. Power actions; sliding type-selecting mechanism.-Upon the operation of a key 1 a setting slide 4 is moved and through mechanism 10-15, Fig. 3, a pin 19 is engaged and a latch 20 with square stud 22 is released. A pawl 23 thereby engages a continuously rotating drive ratchet 27 and a one revolution drive is effected to a coupling member 25 and a cam 44. A pin 28 displaces lever 18 and a further revolution of coupling member 25 is prevented, even if key is held down, because part 15 is moved by the lever 18 away from pin 19; the pawl 23 is stopped by the stud 22. Action of the setting slider 4 also causes a lever 34 to act on the control mechanism compressing a left-hand latch 35, Fig. 6, and the rotation of the cam 44 and an anchor 39 or drive lever 47 moves a slider 49. A rack 137 rotates a toothed shaft 138 to set the type-wheel 142 through gearing, Fig. 12. The slider 49 carries the stops 68, 69 and a double-ended stop 67. These engage one of the setting-latches 53 to determine the amount of rotation of the type-wheel. The control mechanism, Fig. 6, ensures that after a one-revolution drive of the cam 44 and the setting action of the slider 49, the slider 49 and type-wheel 142 are returned to a central position. Wheel case-shift action.-Either row of characters is, during the same power cycle as the setting of the slider 49, positioned for printing. The shifting, if necessary, being effected by a follower 108, Fig. 11, and the one revolution cam 44. The type-wheel carrier 114 is pivotally mounted at 118 on the framework and is normally urged to its upper position so that the lower row of characters is in printing position. If shifting is required, the setting sliders 4, a notched bail 93 is pivoted and a slider 95 is removed from the path of a press rod 96 connected to the cam mechanism 44, 108. Removal of the slider 95 means a rocking of a bellcrank lever 110, Fig. 10, and raising of push-bar 113 which swings the type-wheel carrier so the upper row of type is ready for printing. Sliding for impression.-After the type-wheel has been selectively rotated and vertically positioned, the type-wheel carriage 114 is slid towards the platen to effect impression. This action is derived from the cam 44, drive lever 107, a delay linkage 119, a press lever 120, a press arm 126, bar 127 and lever 129 which is connected by pin and slot 136 to the carrier 114. Aligning for impression.-On movement of the carrier 114, an aligning slider 147 is also carried along but is arrested by a stop 149 so that an aligning latch 151 is brought into the toothing of the type-wheel 142 by means of the spring 154. In order to ensure the setting of the slider 49 at the stops 67, 68, 69, two check pawls 73, 74 are provided for engagement with toothing 72.