Patent GB-838815-A (GB)
Abstract: 838,815. Calculating-apparatus. SCHNEIDER, A., BARTHELMES, H., HENGELHAUPT, W., EICHHORN, H., and ANSCHUTZ, E. Sept. 4, 1956, No. 26956/56. Class 106 (1). In a calculating typewriter having totalizers on the record material carriage and adjacent means on the stationary frame for actuating the totalizers denomination by denomination, a single intermediate transmission member interconnects the actuating means with a remotely situated fingered differential shaft for the purpose of transmitting digit values both during item entry and total-taking. Entering items.-Depression of a numeral key 6, Fig. 2, releases an assembly 21 of powerdriven cams for one revolution, the rear end 8 of the key lever raising a corresponding digit stop 10 to control rotation of a differential shaft 11 having fingers 12 adapted to abut the stops. A pawl 19, displaceable on the cam assembly, is spring-urged into engagement with a continuously driven pinion 23 but is normally held clear of the pinion by engagement with therearend of an intercepting lever 17. The end 16 of this lever 17 is engaged in a pivoted bail 14 and the numeral keys 6 overlie the bail. Key depression rocks the bail and intercepting lever clockwise, so raising the rear end of the intercepting lever clear of the pawl 19, which thereupon engages the pinion 23 so that the cam assembly commences clockwise rotation. A locking lever 32 actuated by a spring 33 is slidable longitudinally on the intercepting lever 17 and engages under a bar 29 to hold the lever 17 and bail 14 depressed, the key being held by engagement of a pawl 48 thereon under the bail. Towards the end of one revolution of the cams, a lug on the pawl 19 trips the locking lever 32 so that the intercepting lever 17 returns counterclockwise and disengages the pawl 19 as the revolution is completed. The bail 14 and key return with the intercepting lever. The cam assembly comprises four cams 68, 71, 85 and 114, Fig. 1. During their revolution, the follower 73 of the cam 71 first raises a sector 59, carried by the upper arm of a three-armed lever, into mesh with a pinion 60 adapted to drive the usual master actuating wheel 61 for the carriageborne totalizers of the apparatus. The threearmed lever is then rocked counterclockwise, under control of the cam 68, whilst a sector 52 on an arm 53 drives the differential shaft 11 until rotation of the shaft and lever is arrested by the abutment of the appropriate finger 12, Fig. 2, with the raised digit stop 10. The rotation so imparted to the three-armed lever corresponds to the digit value keyed and is transmitted by the wheel 61 to the totalizer. Slight reverse rotation is imparted to the arm 53, to take up backlash and bring it into exact digital position, by engagement of a pawl 95 with ratchet teeth on the arm under control of the cam 85. Printing items. The type actions are controlled by additional fingers 97, Fig. 1, on the differential shaft 11 and disposed around the shaft so that the finger corresponding to the digit keyed extends vertically upwards. The type levers 120 are connected, through individual levers 116 on a shaft 102 and links 115, with bell-crank levers 99 having abutment surfaces 100 overlying the shaft 11. Subsequent to differential adjustment of the shaft 11, the follower 111 of the cam 114 thrusts a bar 108 rearwardly, rocking the shaft 102 clockwise which lowers the support shaft 98 of the bellcranks 99. The relevant bell-crank 99 then abuts its vertically disposed finger 97 and so rocks counterclockwise on the shaft 98 to actuate the corresponding type lever 120. Taking totals. Depression of the total key 124, Fig. 3, inserts a reversing wheel 123, Fig. 1, between the totalizer actuating wheels 60, 61 and raises a stop 122 so as to be effective to arrest each totalizer wheel in turn in the zero position. The key also depresses the bail 14 to release the assembly of cams 68, 71, 85 and 114 which are now effective to clear the engaged totalizer wheel and print the digit value of the total. In order to maintain continued action until all totalizer wheels have been cleared, the key 124 is retained by a latch 126 and, through a link 130, rocks a lever 131 clockwise, the upper end of this lever rocking the pivoted rear end 38 of the locking lever 32, Fig. 2, laterally clear of the lug on the pawl 19, so preventing pawl disengagement at the end of each revolution of the cams. When the last totalizer wheel is cleared, the latch 126 is tripped in known manner, the key 124 returns and the lever 131 becomes ineffective. The drive to the cams is then interrupted at the completion of the revolution in the manner previously described. The modified construction of Fig. 5 differs from that of Figs. 1, 2 and 3 mainly in that a rack bar 142 replaces the three-armed lever of the latter construction. The bar directly interconnects a wheel 141 on the fingered differential shaft and the totalizer actuating wheel 60, and is slidable longitudinally on studs 143 and 144 under the action of a spring 154 and the follower 155 of a cam 161. The stud 144 is carried by a lever 145 which is rocked by a cam 150 to engage the rack with the wheel 60 during the appropriate part of the cycle. A bar 167, controlled by a cam 162, actuates a retaining pawl 170 and a correcting backlash take-up pawl 174 for the differential wheel 141. Specification 496,720 is referred to.