Patent GB-628636-A (GB)
Abstract: 628,636. Calculating-apparatus. NILSSON, R. S. Feb. 3, 1947, No. 3193. [Class 106 (i)] In a calculating-machine having a row of main sectors, one for each denomination, which on operation of the main shaft of the machine assume positions determined by setting-up mechanism, each such sector has a co-axially mounted supplemental toothed sector, connected thereto by pin-and-slot and spring means and movable with the main sector at appropriate times in the machine cycle to actuate the totalizer, and transfer is effected by tappets on the totalizer wheels rocking corresponding retaining detents out of the path of movement of stops on the supplemental sectors, the detents being held in the displaced position by means of locking pawls to permit a limited movement of the supplemental sectors relative to the main sectors at the end of their return movement. The transfer parts are restored to normal at the beginning of the subsequent operation. The machine shown is of the single bank type with a settable pin carriage to control the differential movement of the sectors and type-bars. The main sectors 6, Figs. 1 and 12, have teeth engaging racks on the typebars 34 and the supplemental sectors 31, which have teeth to engage the totalizer wheels 30, are co-axially mounted with the main sectors on an axis 18 and are connected by a lost-motion connection 50, 51 and a spring 52. Each sector 31 is associated with a detent lever 53, pivoted at 54, on which is a lug 56 held in engagement with a locking pawl 57 by means of a spring 60. In the normal or non-transfer position a lug 63 on the lever 53 engages a stop 64 on sector 31. During an item entry operation of the machine any lever 53 displaced during the preceding operation is restored to normal when the printing hammer 39 is moved to effect an impression by a trip bar 66 having side arms pivotally mounted and operated by links 70, 71, Fig. 3, connected to the actuating lever 69 of the printing hammer, as described in Specification 628,630. At the end of the half cycle, after printing, the totalizer wheels are engaged with the sectors 31 and on the return movement of the sectors accumulate the item set up, the sectors 31 being arrested by engagement of the stops 64 with the lugs 63 on the detent levers 53 before the sectors 6 reach their initial position. To effect a transfer, a tappet 65 on a totalizer-wheel 30 depresses the associated lever 53 via a projection 65a thereon so that the lug 63 moves out of the path of stop 64 and the next higher supplemental sector 31 is moved an extra unit by spring 52 to abut on the projection 32 of the sector 6, the lever 53 being held by a latch 62 on the locking pawl 57. The displaced levers 53 are subsequently restored by the trip bar 66, as previously described, on the next forward stroke of the main shaft 5. Totalizer-engaging means. There are a positive and a negative set of totalizer wheels carried in a cradle 90 and permanently in mesh with each other, rocking from one position to the other being effected by depression of a subtraction key which operates through links 93 and 94, Fig. 3, quadrant 96, shaft 98, arm 99, Fig. 1, and link 100. Pins 132 on cams 124, Fig. 6, which operate the printing hammer actuator levers 69 (one at each end) depress levers 133, each of which depresses a tongue 136 and pulls down slide assemblies 102, 106, thus causing the totalizer wheels to mesh with the supplemental sectors 31, the slides being locked by catches 114. At the beginning of an operation the main shaft 5 rotates anticlockwise and a trip 121 strikes the nose 137 of a bell-crank 118 which is held against rotation by a lug 138 abutting a finger 139 on a catch 140. Thus a catch plate 112 is swung outwards about a pivot 117 and releases the catches 114. As the pin 132 has left the lever 133, springs 104 move the slides upward, disengaging the totalizer wheels from the sectors 31. Continued movement of the cams 124 causes noses 143 to engage foot-plates 144 and depress the slides to re-engage the totalizer wheels with the sectors 31, the catches 114 re-engaging so that the totalizer wheels are held in mesh throughout the return stroke of the main shaft 5. Totals and sub-totals.-To ensure that all levers 53 are in the non-transfer position when a total or sub-total is taken, the vertical arms of levers 53 each have a nose 73 normally out of the path of movement of a clearance bar 74 connected with the total and sub-total keys. If any lever 53 is in the " transfer " position its nose 73 moves into the path of bar 74 and prevents operation of the total or sub-total key until a " clearing " operation is performed. When the sub-total key is depressed link 88, Figs. 3 and 7, moves back, lever 84 turns anticlockwise and a cam surface 84a on it depresses catch finger 139 so that it is out of the path of lug 138 on lever 118, Fig. 6, and allows lever 118 to swing about its pivot 119 under the impetus of trip 121. Thus catch plate 112 is unaffected and the slide assemblies are held down, so that the totalizer wheels 30 remain in mesh with the sectors 31 for a whole cycle. Depression of the total key also depresses the sub-total key so that the operation for the first half-cycle is the same. A link 145 is moved to the right (Fig. 3), and turns a sleeve 147 clockwise via an arm 146. A pin 149 on an arm 148 attached to the sleeve turns a lever 151 clockwise and swings the slide 106 about a pivot 107 until its foot-plate 144 is clear of the path of movement of nose 143. Thus, near the end of the forward stroke of main shaft 5, trip 122 (not shown), similar to trip 121, strikes lever 120. This cannot turn anti-clockwise because of stop 156 and thus moves forward against catch-plate 112, Fig. 6, freeing the catches 114 and allowing the slide assemblies 102, 106 to move upwardly. The totalizer wheels 30 are now out of mesh with the sectors 31 and remain so until the end of the return stroke of main shaft 5, when the pin 132 on cam 124 presses lever 133 so that its nose 135 bears on the lug 136. ' Specification 620,175 also is referred to.