Patent GB-521300-A (GB)
Abstract: 521,300. Type-lever actions. MERCEDES. BUROMASCHINEN-WERKE AKT.-GES. Nov. 14, 1938, No. 33043. Convention date, Dec. 1, 1937. [Class 100 (iv)] [Also in Group XIX] In a typewriting calculating machine having number-typing keys for causing typing only and also calculating keys for causing digits to be. entered into the calculating mechanism and to be typed, a driving shaft for the typing mechanism, and a driving shaft for the calculating mechanism, the type levers are connected to the typing-mechanism driving shaft by the number-typing keys and to the calculating- mechanism driving shaft by the calculating keys. The type levers are also connected to the latter driving shaft to record the total during totaltaking.  Typing. The depression of a numbertyping key 11z, Fig. 1, lowers a lever c carrying a link d which pulls down a link b into contact with a rotary, ribbed shaft a, the link b being thereby pulled suddenly to the right to rock a lever 80 operating the type lever 81. Item entering and typing. The depression of a " calculating " key 16, Fig. 3, releases a pawl 609 slidably mounted on a pair of cams 42a, 612, the pawl being moved to the right by a spring 614 to engage its end 609a with a pinion 616 secured to a rotary shaft 43 forming the calculating- mechanism driving shaft. The cams are thus  clutched to the shaft, but after one revolution the key lever 16 is released as described below and engages the pawl 609 to declutch the cams. The cams are held at rest by the contact of a roller 617, Fig. 1, on the cam 42a with a spring- controlled lever 619. An actuating slide 46 bears on the cam 612 and is, reciprocated to enter the digit into the totalizer by known means. During the descent of the slide 46, a projection 628, Fig. 3, thereof rocks a member 627 about an axis 631 so that a roller 637 on the member comes into the path of the cam 42a. The member 627 and its axis 631 are, carried on a lever 632 which is thus rocked clockwise about its pivot 643 bythe cam 42a, the lever 632 being connected by a link-651 to a lever 653 which rocks anticlockwise a lever 664 connected by a link 670 to the lever 80 operating the type lever 81. The cam 42a also controls the paper-carriage feed through means not described. In a modification, Fig. 13, when an actuating slide 46 descends a pin 697 thereon pushes down a rod 687 so that its end 686 is engaged by a lever 678 rocked by the cam 42a, the rod 687 thus being moved to the left to operate the corresponding type lever (not shown in Fig. 13). Total - taking. The depression of the totaltaking key 17, Fig. 8, causes a pair of cams 129, 131 to be clutched to the rotary shaft 43. A release slide 179 bearing on the cam 131 thereupon descends, a pin 272 on the slide rocking clockwise a lever 341, 342 to move to the right a coupler 347 slidable on a lever 319, the lever thus being coupled, by means of a lug 351, with a link 353 on arm 360. The lever 319 forms one side of a frame 319, 327 pivoted at 368 and carrying the axis 317 of the levers 664 operating the type levers 81. The levers 664 have arms 340 adjacent a set of fingers (not shown in Fig. 8) operated as described in Specification 496,720 so that a finger is above the arm 340 of that lever 664 operating the type lever of the total digit to be typed. The cam 129 rocks the arm 360 to lower the link 353 and swing the frame 319 clockwise, the shaft 317 and all the levers 664 being elevated. The lever 664 beneath the set finger is engaged by the finger and caused to rock, the type lever 81 thus being operated through the connection 670, 80. To prevent distortion of the frame, a rod 373 secured therein is engaged by forks 713, 714 fixed to a shaft 710 urged anticlockwise by a spring.