Patent GB-191302318-A (GB)
Title: Improvements in or relating to Adding Machines.
Inventor: WADE HAROLD
Filed: 1913-01-28
Granted: 1914-01-01
Abstract: 2318. Wade, H., [Austin Adding Machine Corporation]. Jan. 28. Adding-apparatus. - Key-set lever-operated single-bank adding-machines having a group of wheels which are successively set, as the keys are depressed, and moved step-by-step into engagement with the receiving-wheels until the setting-up of the item has been completed, whereupon the item is transferred to the receiving-wheels by the movement of the operating-lever, are provided with transfer mechanism of special form adapted, moreover, to prevent overthrow, with means for operating the transfer mechanism, such means serving also as an interlock for the keyboard and operating-lever, and with a full-stroke device, and error-preventing means. Selecting denomination.-The wheels 1 of the group of item or selecting-wheels, Figs. 2 and 7, are consecutively set by the keys 8 and slid, one by one, by means of the escapement-device 9 ... 14, into engagement with the group of receiving-wheels 15 for the adding-wheels 33. The wheels are returned to their normal position to one side of the receiving-wheels bv a cam mounted on the shaft 22 and actuated by the main operating-lever. Transfer mechanism; dash-pots. - Transfer wheels 50, Fig. 2, engage with the receiving- wheels 15. At transfer projections 51 attached to the wheels 50 rock a pivoted plate 53, Fig. 8, having slot-and-pin connexions with the transfer pawl 52. The pawl is thus lowered, a detent 62 moving from a notch 65 in the pawl to a notch 64. Upon the ensuing half-revolution of a drum 56 provided with two series of staggered cams 55, the pawl is rocked round the pin 63 as a pivot and is thus caused to engage with the next higher transfer wheel 50 and drive this wheel a distance of one tooth. At the end of the movement of the higher wheel, the pawl remains in engagement with the wheel, thus preventing overthrow, and then falls owing to the release of the plate 53 and the action of the detent 62. The drum 56 is driven from the main operating- handle through a clutch 68 ... 70, Fig. 4. A spring-controlled detent 61 is provided for the transfer wheels 50, Fig. 8. Interlocking.-The drum 56 receives its movement from the operating-handle through a link 20, Fig. 4, arm 21, shaft 22, toothed wheels 23, 24, shaft 25, and clutch 68 connecting the shaft 25 and the drum. The periphery of the clutch is provided with a notch 85 co-operating with a locking-arm 84, Fig. 2, attached to the escapement-arm 13. When the operating-handle is not in its normal position, the notch 85 is displaced and the periphery of the clutch prevents the ascent of the locking-arm and consequently the actuation of the keys. A dash-pot 86, Fig. 2, the piston of which is connected to the shaft 22, cushions the return stroke of the operating-lever. Full - stroke mechanism. - The full - stroke device, Fig. 5, comprises a sector 77 mounted upon the shaft 22 and co-operating with a pair of rollers. In the forward movement of the handle, the upper roller is held out of engagement with the sector by means of a disk 73 and lever 74, but the lower roller in case of a reverse movement would be jammed between a vertical wall 78 and the sector. In the backward movement of the handle, the lower roller is disengaged from the sector by the disk 73 and lever 81, and the upper roller prevents accidental forward movement, before the stroke is completed; the completion of the stroke allows the rollers 71, 80<1> to fall into notches in the disk 73. Error keys. - Mounted on a rod 47 is an escapement-arm 13 co-operating with a rack 45 carried by the carriage bearing the item-wheels 1. The arm 13 is normally rocked by a link 12. If the key 47<Î> on the rod 47 is pressed in, however, a slight lateral movement to the right is given to the wheels 1 and the carriage, causing the wheels to take up an intermediate position between the receivirg-wheels 15 of the adding- wheels. They are zeroized in this position by the subsequent movement of the operating-lever.