Patent GB-618357-A (GB)
Title: Improvements in or relating to cash registers and like machines
IPC: G06C11/02
Filed: 1946-10-25
Abstract: 618,357. Cash registers. GROSS, H., and GROSS, S. Oct. 25, 1946, No. 31697. [Class 106 (i)] In a key set and operated cash register of the kind in which the keys are operatively and differentially associated with toothed elements by means of cams (key lever cams), the toothed elements engaging toothed wheels which can drive a pivotally mounted totalizer, and operatively associated with a pivotally mounted cam element adapted to rock the totalizer to bring the toothed wheels into engagement with the toothed elements, the totalizer being held in this position during actuation of the toothed elements, overrunning and jarring of the toothed wheels are prevented by shaping each key lever cam to first move the toothed element the required amount and then hold it stationary and arranging the totalizer holding means to hold the parts in toothed engagement until the toothed elements are held stationary, but permitting rocking of the totalizer to disengage the parts before the keys reach the limit of their downward movement. Each key lever cam 24 has a surface 25 ending in an arcuate slot 26 which is on the circumference of a circle having its centre on a shaft 11 about which the keys rock, so that when a key is pressed, the surface 25 moves one of four coaxial bars 28 to rotate one of four toothed elements 31 (for pounds, shillings, pence and halfpence) and the bar 28 then rides in the slot 26 without further movement of the toothed element. Depression of a key also lifts a bar 41 and rocks a sector plate 39 so that a projection 38 on the totalizer is lifted by the front surface 47 of a pawl 46. This rocks the totalizer into engagement with the toothed elements and the projection 38 then rides on an arcuate cam rib 42. When the projection moves beyond the rib, which it does after the toothed elements have stopped moving and before the key is fully depressed, the totalizer is returned to inoperative position by a spring 50, the projection riding underneath the rib 42 and forcing its way past the end of the pawl 46. Transfer mechanism. Three transfer levers 56 are provided for effecting transfers from halfpence to pence, pence to shillings and shillings to tens of shillings. Each carries a transfer pawl 57 and a trip pawl 58 normally engaging a common abutment bar 61. Transfer pins 62 on the indicator wheels trip the pawls when a transfer is due and the transfer pawl is brought behind the next lower tooth of ratchetwheel 54. Abutments 67 on the transfer levers 56 are actuated by three cam projections 69 on cam plates 68 carried on shaft 12 when the keys move back to their normal position. The projections are staggered so as to operate the transfer levers in succession. The Provisional Specification describes the provision of a series of balls or stop levers in a cage for each bank to prevent simultaneous operation of two keys in one bank. The levers carry arms which must pass between the balls when the lever is depressed, and the total spacing between the balls is only sufficient to permit one arm to pass. Specification 600,446 is referred to.