Patent GB-364210-A (GB)
Title: Improvements in and relating to typewriter calculating machines
IPC: G06C25/00
Filed: 1930-10-13
Abstract: 364,210. Typewriters. MERCEDES BœROMASCHINENWERKE AKT.-GES., Benshausen, Mehlis, Zella, Thuringia, Germany. Oct. 13, 1930, No. 30557. Convention date, Dec. 24,1929. [Class 100 (iv).] Relay type-lever actions.-In a typewriter calculating- machine having separate numeralcalculating and numeral-typing keys, the latter are locked when the totalizer is in the calculating position, the type-levers being operable by members associated with the calculating mechanism without the depression of the numeral-typing keys. The depression of a numeral-calculating key 8, Fig. 2, causes the transmission of the corresponding value either additively or subtractively to the totalizer Z secured to the paper-carriage 3. The depression of a numeral-typing key 93 rocks a lever 45 about its pivot 49 and draws down a link 43 thereby causing a hook 39 to engage a rotating toothed wheel N. This causes the hook to be drawn to the right and, by means of a lever 33 pivoted at 34, to swing the type-lever 37 in an anticlockwise direction about its pivot 36. On reaching its extreme left-hand position the carriage is automatically returned to the right by the action of the righthand margin setter Rr on mechanism, not shown, which makes a coupling 55, 56 to move the carriage through gearing 57 .. 66 until the left-hand setter Rl interrupts the coupling. Locking-devices.-The depression of the numeral-typing keys is prevented when the totalizer is in the calculating position. Means are also provided to prevent action of the calculating mechanism and to release the numeral-typing keys when, with the totalizer in operative position, it is desired to type an item without entering the same. The rocking of the lever 68b by a projection on the totalizer on reaching its active position causes an extension 75 of the lever to move to the left a bar 79, Fig. 3, to cause a stop 83 pivoted at its end to prevent the raising of a link 85 connected to a bar 92 running beneath the heads of the numeral-typing keys 93. The key stem 95 is slotted and through the slots project pins secured to the key lever 45. The two parts are normally held together by a spring 98 but the lever 45 may be depressed independently of the key when the latter is locked by the bar 92. To the lever 45 is pivoted at 45a a lever 97 having a slot engaging a pin 45b secured to the lever 45. The lever 97 is retained in its upper position by the spring 98. Each slide 21 released for operation by a numeral-calculating key has a projection 21d which engages the lever 97 and depresses the lever 45, the double levers 97, 45 allowing for variations in the movements of the various parts. Wedges 45d secured to the levers 45 engage a roller-type crowding lock. A slide 99 can be moved manually to the right to cause projections 100 thereon to engage slots in the slides 21 to lock them in their upper positions, an arm 101a on the slide 99 at the same time rocking the lever 68b to push the bar 79 far enough to the left to move the stop 83 out of the path of the link 85 and thus to free the keys 93. In a modification, the link 85 is connected to the bar 79 by a V slot so that,' in its two end positions, the bar pulls the link upwards and releases the keys, whereas in its mid-position the link is lowered and the keys locked.