Patent GB-1012831-A (GB)
Abstract: 1,012,831. Cash registers; transfer mechanism. H. GROSS, and S. GROSS. Sept. 7, 1962 [Nov. 8, 1961], Nos. 39972/61 and 39973/61. Headings G4D and G4T. A cash register or like adding machine of the kind having a pair of totalizers movable to engage toothed racks which are differentially set under the control of amount keys or the like, is characterized in that the totalizers each have a cam follower axially movable against spring pressure relative to an associated cam-shaft under control of manually operable members to co-operate with a selected cam, which cam rotates to engage the totalizer with the racks during a portion of their movement to perform the required function. As shown, a grand totalizer 73 pivoted at 71 and a second totalizer 72 pivoted at 70, e.g. for summing the purchases of a single customer, are rocked by cams on shafts 56, 124 into engagement with rack bars 45 which are moved under the action of springs 54 and arrested differentially by the stems 17 of depressed keys 18, which stems co-operate with abutments 62 on the rack bars. An abutment such as 38 on the stem of a selected key moves an associated rack 29 which rocks a pawl 65 to release the corresponding rack bar 45 for movement. The racks are returned to their initial positions by an arm 58 rocked by a cam 55 on the motordriven shaft 56. Type wheels 117 are set by teeth 140 on the rack bars 45; a receipt 150 is issued and a record 151 is taken. Each totalizer has a cam follower 128, 129 mounted on a shaft 130, 131 axially movable relative to the totalizer against the action of a spring 132. The grand totalizer 73 has three associated cams 125, 126, 127 for engaging the totalizer with the rack bars respectively during forward only, forward and return, and return only of the rack bars, respectively for adding a single purchase, subtotalling and totalling, while the " list " totalizer 72 has only two associated cams 122, 123, respectively for adding a single purchase to the list and for reading out the total. The keys are arranged in three banks: a central amount key bank, a right-hand bank consisting of a single item entering key, a list key and a list total key, and a left-hand bank consisting of grand and sub-total keys, a paid-out key, and a key which disengages the grand totalizer so that other calculations using the list totalizer 72 can be performed. The paid-out key allows amounts set up on the amount keys to be printed without using either totalizer. Each of the three keys of the right-hand bank operate in a similar manner. A pair of rocker members 246 pivoted on a common shaft 245 have followers 251 which engage abutments 133, 134 on the shafts 130, 131. According to which one of the keys is depressed, one and the other rocker is moved by the key stem and moves the corresponding cam follower or followers on the totalizers into co-operation with the selected cams 122, 123, 125. As shown, depression of the list key 201 moves both rockers, and thus both followers, into positions where the followers engage cams 125, 122 and the amount previously set up on the amount keys is added to both totalizers. The keys of the left-hand bank, such as the grand total key 300, operate similar rockers 326, 327, but have arms 333, 340 which pull the followers 128, 129 into place. These keys cause the followers to move greater distances than the keys of the right-hand bank and thus override the effect of the latter keys. The keys of the right-hand bank are locked against depression by key operable locks. Transfer mechanism. Each totalizer consists of a plurality of toothed wheels 79 freely mounted on a shaft 78 and having attached to each wheel a trip cam 80 and a ratchet-wheel 81. Associated with each toothed wheel 79 is a transfer lever 82 pivoted at 83 and carrying a transfer pawl 85 which meshes with the ratchet wheel 81 of the next higher denomination. From the position in which a pawl 90 pivoted to the transfer lever 82 engages the top face of a square bar 92, as shown, the toothed wheel 79 rotates clockwise until a lobe of the cam 80 engages the top end of the pawl 90 and rotates it clockwise slightly, disengaging the end 91 from the bar 92 and allowing the transfer lever 82 to rotate anti-clockwise under the action of a spring 95 causing the pawl 85 to step back one tooth of the ratchet-wheel 81. When the totalizer is next raised, a fixed bar 114 passing through the totalizer engages the sides of a slot 113 in a bale arm 111 and causes it to rotate anti-clockwise drawing back the pawls 85 which have not been stepped back, from out of engagement with the ratchet-wheels 81. A locating pawl 102 is also withdrawn from engagement with the toothed wheel 79 to allow it to rotate freely. While the totalizer is raised, transfer cams 101 engage the followers 100 on the transfer lever 82 and rotate them clockwise so that the operative pawls can move the toothed wheels of the next higher denomination through one step.