Patent GB-191321049-A (GB)
Title: Improvements in or relating to Adding Machines.
Inventor: HOLLOWAY WILLIAM MICHAEL
Filed: 1913-09-17
Granted: 1914-09-17
Abstract: 21,049. Holloway, W. M. Sept. 17. Adding-apparatus with operating-means. - A multiple-bank adding - apparatus, comprising differentially-set pawl-carrying disks which are restored by means of an operating bail or frame, thereby driving the toothed wheels cooperating with the pawls, is provided with an interlock for the setting and zeroizing members, and for the unmoved setting - disks and operating-member, transfer mechanism including means for preventing overthrow at transfer, means for clearing the total indicated, errorcorrecting devices, means for locking the machine to prevent tampering therewith, a full-stroke device, and means for preventing overthrow during an operation of the machine. In order to set an item, the setting-disks 30, Figs. 4 and 9, are rotated by means of their extensions 34, which are raised until the digits of the given item are seen through apertures 35. A spring pawl 31, 32 forming part of the disk 30 rotates, during this setting movement, idly over a ring 28 of ratchet teeth fastened to one face of the receiving-wheel 27 of the totalizing-counter. The movement of a disk 30 raises a corresponding locking-lever 38, owing to the co-operation of the edge 39<a> of the notch 36 with a lug 37<a> on the lever. The levers 38 in turn lift a pivoted plate 41, 46, carried by the operating-bail 42, so that the plate, when the bail is moved, rides on the exterior surface of a fixed cam 47, Fig. 5. The item having been set, the bail 42 mounted loosely on the shaft 29 is moved downwards by means of a handle (not shown), whereupon a flanged plate 48, the rear edge 49 of which normally locks the numeral-drums 24, engages the extensions 34, 32<a> of the setting-disks and restores them to normal position, the pawls 31, 32 meanwhile driving the ratchet-rings 28 and receiving-wheels 27. The wheels 27 actuate the numeral-drums through toothed wheels attached thereto. To lock the machine, the shaft 29 is turned so that the projecting arms of the disks 78 are forced against the projections 80 when the setting-disks 30 are in their normal position; the shaft 29 is locked in this position by a locking-member 85 adapted to engage with a projection 86 of a disk 81 secured to the said shaft. The rotation of the disk 81 with the shaft raises a pivoted member 92 so that its flange 93 forms a continuation of the surface of the fixed cam 47, and prevents the plate 41, 46 from riding beneath it, and consequently from clearing the machine by engaging with the projections 52. Interlocking.-The raising of the plate 41, 46 so that it rides on the exterior surface of the cam 47 renders it impossible to zeroize the totalizing-counter. When the bail 42 is moved, projections 49 on the flanged plate 48, which normally engage with cam-surfaces 38<a> on the locking - levers 38, allow the levers associated with the setting-disks which have not received a setting - movement, to be pulled by their springs so that the lugs 37<a> fall into the notches 36 of the disks and lock them until the operating-bail is returned to normal position. Transfer mechanism. - For transfer, one of the transfer-teeth 52 on a disk 51 attached to the receiving-wheel 27 engages a lug 53 on a plate 54 pivoted at 55, and rocks it so that it rocks in turn a guard-plate 60, pivoted at 61 in a T-shaped slot in the plate 54, from the position shown in Fig. 4 to that shown in Fig. 10. In the former position, the guardplate prevents the series of transfer-actuating pawls 65, arranged in echelon on the frame 43 of the operating-bail 42, from engaging with the ratchet-wheels 58 attached to the transfer pinions (not shown) co-operating respectively with the receiving-wheels 27. In the latter position, the notches 62 of the fixed partitions 63 are exposed to the pawls, which consequently drive the ratchet-wheels through a single step. The guard-plates 60 are turned during the downward stroke of the operating-bails, whereas the transfer movement takes place during the upward stroke; the plates 54 are consequently latched by pivoted plates 66 until the cooperation of the pawls 65 and ratchet-wheels 58 has ceased, whereupon the latches are released by the engagement therewith of the frame 43 or the plate 41, 46. Overthrow at transfer is prevented by pivoted detents 72 which are turned by the pawls 65 engaging their cam-edges 77, and so forcing projections 75 into the path of the teeth of the ratchetwheels 58. Zeroizing-mechanism. - When the setting- disks 30 are all in their zero position, the movement of the operating-bail 42 will cause the plate 41, 46 to move beneath the fixed cam 47, Fig. 5, and to engage the transfer-teeth 52 on the disks 51, thus rotating the receiving- wheels 27 and the numeral - wheels engaging therewith to their zero positions. The zeroizing-mechanism may be locked out of action as stated above. Error levers.-Disks 78, Fig. 4, having projecting arms are secured to the shaft 29, which can be rotated by a handle (not shown) so as to disengage the pawls 31, 32 of the setting- disks 30 from the ratchet teeth 38, and by engagement with projections 80 restore the setting-disks to their normal position. Full-stroke mechanism. - A full-stroke pawl (not shown) co-operates with notches on the frame 43 of the operating-bail. Overthrow - preventing mechanism. - Overthrow of the wheels 27 during the operation of the bail is prevented by the spring-controlled detents 40, the tails 40<a> of which, at the end of the downward stroke of the operating-bail 42, are engaged by the rear edge thereof.