Patent GB-214692-A (GB)
Abstract: 214,692. Odhner, V. J. Jan. 16, 1923. Multiplying and dividing apparatus; adding and subtracting apparatus.-In a cam-disc and pinwheel machine having a crank handle lock, the cam discs are rotated by transmission racks permanently in operative connection with setting elements (keys or levers) and movable towards or away from the cam-disc shaft, there being also an interlock between these racks and the crank handle lock such that these transmission racks are automatically and positively thrown into, or out of, engagement with the cam-discs when the crank handle is locked or unlocked respectively. The cam-discs 5 mounted on a shaft 2 have teeth 16 adapted to engage with transmission racks 15 slidably carried in a. common frame 13 pivoted at 14 and having a member 12 rigid therewith, with which co-operates a cam 10 rigid on a shaft 11 at one end of the barrel. The crank handle lock is not shown but is as in Specification 213,305 in which the shaft 20 corresponds with the shaft 11 in the present application. Fig. 1 shows the shaft 11 in the position in which the crank handle is locked in zero position whereby the cam 10 is in the position shown, holding the frame 13 raised and the racks 15 in mesh with the teeth 16. When the crank handle is unlocked and rotated the cam 10 rotates, the frame 13 is thereby lowered and the racks 15 disengaged. When the racks 15 are engaged they are held in adjusted position by a device such as shown at 45, Fig. 3, and when in disengaged position they are locked by a bar 17, Fig. 1. For adjusting each rack 15 there are two adjacent bell cranks 18, 19 and 20, 21 pivoted at 25, 26, controlled by springs 27, 28, and co-operating with pins 22, 23 on the racks 15. These cranks are depressed to set differentially the rack 15 by keys 24. If, for example, the key 24 with the numeral 3 is depressed the arms 18, 20 are depressed but the arm 19 swings farther than the arm 21 since this key is nearer the pivot 25 than the pivot 26. The arm 21 then moves the pin 23 and rack 15 to the position shown in dotted lines where the rack is then arrested by the arm 19 contacting with the pin 22. It is obvious that another number may be set without first zeroizing the rack. The " 0 " and " 9 " keys actuate the arm 18 only and the arm 20 only, respectively. Attached to each rack 15 is a metal band 29 moving in a guide 30 and bearing numerals so as to show at a window the value of the rack setting. A device not shown in the drawings is used to zeroize simultaneously all the transmission racks. In a modification, Figs. 3 and 5, the shaft 11 carries an arm 32 pivoted at 33 to an arm 34 pivoted at 35 to the member 13, the pivots 11, 33, 35 being approximately in line when the crank handle is locked and the racks 15 are engaged. In this case the racks 15 are circular and are mounted on a common shaft 36. Co-operating with each rack 15 is a lever 37 rigid with it and a lever 38 pivoted at 39 and having an arm 40. This arm 40 actuates a pivoted' bell crank 41, 42 controlled by a spring 43 and having a roller 44. When the racks 15 are engaged they are held bv pawls 45 and when disengaged, by a bar 48. When a key 24 is depressed the lever 38 is first actuated so that an arm 46 on it removes the pawl 45 from the rack teeth and on further depression the lever 37 is depressed to rotate the rack. According to the value of the key depressed when the correct number of pin have been protruded the lever 38 will cause the roller 44 to arrest the lever 37. Upon release of the key the pawl 45 re-engages the rack. To reset, the " 0 " key is depressed, causing the roller 44 to rise and restore the lever 37 to normal position. According to a further modification, Figs. 7 and 8, the frame 13 carrying the transmission racks 15 also carries a roller 49 moving in a cam-groove 50 in a disc 51 on the shaft 11 so that the roller 49 occupies one of two positions according to whether the crank handle is locked or unlocked. Each rack 15 is connected to a lever 61 pivoted at 63 and having a segment 64 operating an indicator drum 67 in place of the numeral band 29. Connected with each lever 61 hy a link 62 is a sliding bar 52 having a pin 53 for each key 24. Each pin co-operates with cam surfaces 54, 55 on a member 56 pivoted at 59 and also pivoted to the key, the two cam surfaces being joined by a groove 60. In the normal positions of the keys a locking bar 70 engages in notches 69 in the keys, but when any key is depressed the bar 70 is momentarily displaced and then locks in a second notch 68 in the depressed key. The members 56 are arranged alternately on each side of the bar 52 and the pins 53 normally occupy the positions shown in dotted lines, Fig. 8, adjacent the surfaces 55. When a key is depressed the corresponding surface 55 moves the pin 53 and bar 52 to the left the appropriate amount due to the size and shape of the cam surface 55. The other surface 54 would move the pin the complement of this amount to the right. When a key (e.g. the " 0 " key) is depressed any other already depressed key is released by the bar 70 and restored by a spring 57. A device is described for simultaneously depressing all " 0 " keys to zeroize the bars 52. The "0" keys are thus normally depressed. When the racks 15 are disengaged pawls 73 attached to the members 13 rise and lock the locking bars 70. In a third modification, Fig. 6, each rack 15 is integral with a setting finger 80. When the racks are engaged they may wipe past spring-pressed locking pawls 81 but when the racks are disengaged the pawls 81 rest on a member 82 and positively lock the racks. A shaft 75 has rigid with it a resetting key 78 and arms 76 coacting with pins 77 on the racks when the latter are restored to zero. Pivoted at 86 to each arm 76 is a member 85 having a roller 88 and a shoulder 87 coacting with the arm 76 so that when zeroizing begins each member 85 depresses an arm 89 rigid with each pawl 81 so that these pawls are disengaged from the racks. During return of the zeroizing device the members 85 swing on their pivots to move past the ends of, and along, the arms 89 back to original position. In all the embodiments shown the frame 13, instead of being pivoted at 14, may slide towards and away from the cam discs.