19,978. Briden, R., [representative of Palmer, C.]. Aug. 26. Cash registers with operating-means; differential mechanism.-Machines of the type described in Specification 9400/97 are provided with actuating - mechanism for the totalizer, such that these parts may be readily interchangeable with the corresponding mechanism in the type of apparatus described in Specification 10,213/93. The actuating - mechanism in the tens-of-shillings denomination comprises two independently movable members, and is operated in a special manner. An amount key 1, when depressed, determines the extent of movement of a segment 13 when the main crank-handle is actuated, as described in Specifiation 9400/97, and this segment 13 engages gear-wheels 14, which mesh with pinions 15 attached to the indicating-disks. To the hub of each gear-wheel 14 is secured a pinion 19, which meshes with a rack 20 attached to a slide 21, adapted to move in a slot 22 and provided at its front end with a slot engaging a pin 26 on a segment 27 adapted to actuate the totalizer. The totalizer wheels 81, mounted on a rocking frame 92, are normally out of gear with the segment 27. The rocking frame has a depending arm rocked in the usual manner by means of a pin thereon engaging an L-shaped slot in one end of a lever 97, the other end of which is forked and has a pin engaging a cam-slot 99 on a disk 100 secured to the main shaft 5. The pounds and farthings segments 27 are connected to their respective slides 21 by arms and sleeves surrounding the spindle 28. The segment 27 for the tens-of-shillings position is secured to the spindle 28 which is provided with a depending arm 32 engaging a slot 34 in a plate on an arm 36, which arm at its lower end is connected to a lever 37 formed at its forward end with a recess 39, into which is adapted to project a pin 40 on a snap pawl 41. The pawl 41 is pivoted to the lower end of a member 43 working in a pin-and-slot connexion on a pivoted member 47 guided about its pivot by a pin 51. On the depression of the tens-ofshillings key 42, the stem engages the flange 55 and rocks the member 47 so as to allow the pin 40 to enter the recess 39. The key is held in its depressed position by a slide 62 pivoted to the bell-crank lever 65 connected by a link 66 to an arm 67 on a spindle 38. At the beginning of a rotation of the crank-handle, the shaft 10 is rocked in the direction of the arrow, Fig. 2, and, by the engagement of the arm 73 with the slot 75, rocks the bell-crank lever 77, thereby causing its bevelled end to press back the pin 40 until the recess 80 allows the pin to return to engage both recesses. On the return of the shaft 10 to its normal position, the lever 77 is lowered, and carries with it the pawl and member 43; this movement rocks the lever 37 to raise the arm 36 and rock the segment 27 to actuate the corresponding totalizer wheel, and, through a rack, to actuate the corresponding indicator. At the end of an operation of the handle, the arm 9 on the shaft 10 engages a pin on the arm 67, disengages the slide 62, and allows the key 42 to return to its normal position. The succeeding operation of the machine through the lever 77 and pin 90 on the lever 37 returns the above-described actuating-mechanism to its initial position. Keys for special transactions.-When a special transaction is to be entered upon the machine, it is desirable to hold the totalizer inoperative. This is effected by providing the special keys with sliding plates, which, on the key being depressed, are forced rearwardly to bring a projection on one of the slides into the path of a bell-crank lever, which is adapted to be rocked by a cam on the main shaft 5 to impart an additional rearward movement to the slides, which movement, through an arm attached to the slides, rocks the spindle 38, and, through an arm 121, Fig. 1, raises the link 97 to bring the pin 95 into the horizontal part of the L- shaped slot. The rear end of one of the slides actuates the feeding-roller for the check strip as described in Specification 2943/01. Transfer mechanism. - Transfer between the totalizer wheels is effected, after they have been moved out of gear with the actuating-segments, by means of pawls 102, which are tripped by the lower wheel and rocked to actuate the next higher wheel. The extensions on the pawl arms engage one end of a link 105, which is operated by a cam on the main shaft.