Patent GB-228567-A (GB)
Title: Improvements in or relating to the differential mechanism of cash registers
IPC: G06C7/10
Filed: 1925-01-31
Abstract: 228,567. National Cash Register Co., (Assignees of Brand, S.). Feb. 2, 1924, [Convention date]. Cash registers.-In a key-set lever-operated machine having the general arrangement of totalizers in three lines of the type described in Specification 8119/15 modified arrangements and constructions of the various parts are described involving a special form of differential mechanism and associated latch members. Keyboards.-The machine as shown comprises four banks of amount keys, three banks of control keys for the transactions, departments, and clerks, and a total lever 33. The keys in each bank are mounted in a frame 34, Fig. 2, and cooperate with the usual detent plate 39, Fig. 3. Differential mechanism.-A plurality of supporting plates 41 are mounted on shafts 42, 43 and carry hubs 51 on which are pivotally mounted the driving members 45 and differentially movable members 52. Each differential member 52 is normally latched to a corresponding driving member 45 by means of a two-armed latch member 54, Figs. 2 and 4, the arm of which is provided with a lateral projection 55 engaging the upper end of a flange 56 on the member 45, the other arm having a nose 63 that is adapted, on the clockwise rotation of the differential member, to engage the projecting pin 38 on the depressed key to release the latch, whereupon an arm 57 integral with the lever 54 engages the corresponding notch of a plate 58 to hold the differential in set position. The latch is maintained in the inoperative position until the depressed key is met by reason of the forward side of the nose 63 being long enough to be in contact with one of the undepressed pins 38. Rooking of the latch in the opposite direction is prevented by a pin 60 at the upper end of a bell-crank lever 59 engaging a flange 61 on a plate carried by the supporting plate 41. The driving members 45 receive an oscillatory movement successively from a crank lever on a shaft 46 that carries a number of arms 48 each having a. roller 49 for engaging a shaped slot 50 in the corresponding member 45. The outer parts of the slot are shaped to be concentric with the shaft 46 at the extreme positions of the member 45. If no key in a bank is depressed the latch member is released by a zero trip pin 74 on an arm 73 on a shaft 72 and normally lying in the path of the lever 54. The depression of a key, however, through an arm 75 pivoted to the lower end of the detent 39, Fig. 3, rocks an arm 77 on the. shaft 72 and causes the arm 73 to remove the pin 74 from the. path of the lever 54. Return of the differential members is effected by a pin thereon 103 co-operating with a projection 104 on the driving members 45. Each differential member 52 carries three slidably mounted totalizer actuating racks 131. Machines with several item-value totalizers.- The machine as shown comprises three lines of four totalizers with the wheels arranged in denominational groups. Each of the control key banks is provided with a differential mechanism similar to that described above and has a beam actuator and link mechanism to select the totalizer. Differentially-moved indicators.-Each differential member 52 has pivoted thereto a beam 81 connected at its other end by a link 82 to a lever 83 carrying a segment 89 with bevel teeth engaging a pinion 90 on the shaft of the indicator drum 93. A bar 86 operated by suitable means cooperates with teeth 85 to serve as an aligning means for the indicators. Another segment 100 carried by the lever 83 engages a pinion 101 on a shaft 102 to transmit the setting of the lever to a second indicator viewable from the rear of the machine. The shafts 102 may also be utilized to position printing wheels in any suitable manner. The Specification as open to inspection under Sect. 91 (3) (a) comprises also transfer-mechanism forming the subject-matter of Specification 242,307, and total and sub-total taking mechanism forming the subject-matter of Specification 242,308. This subject-matter does not appear in the Specification as accepted.