GB1262621A - Error detecting means for counters - Google Patents

Abstract

1,262,621. Counter resetting mechanisms. S. MULLER, and H. MULLER, [trading as J. HENGSTLER K.G.]. 7 April, 1970 [20 June, 1969], No. 16305/70. Heading G4D. A counter has a number of digit wheels and a transfer mechanism comprising a number of pinions which are taken out of mesh with the digit wheels during zero-resetting. A mechanical feeler determines whether the resetting has been correctly performed by taking a certain position only when all the digit wheels have been reset and when the pinions are in mesh. Each digit wheel 2 has a cam 3 and an associated resetting lever 4. When key 5 is pressed the transfer pinions 6 are displaced vertically downwards and the levers 4 rotate to reset the wheels 3 to the zero position illustrated. At the same time pin 12 rotates a spring-loaded pawl 13 mounted on feeler rake 10 until it passes beneath it, allowing the pawl to return to the horizontal. When key 5 is released its upward movement causes pin 12 to act on the inclined surface of pawl 13 so attempting to rotate feeler rake 10 about axis 19. If the counter is correctly reset this rotation will take place, feeler fingers 14 entering deep notches 15 and button 11 being depressed to generate an electric signal. If any digit wheel is not correctly reset the feeler rake 10 cannot rotate so no signal can be generated and the key can not rise to its rest position. Similarly, if the transfer pinions 6 have not meshed with the digit wheels as in Fig. 5, nose 17 of an arm 7 carrying the pinions abuts part of the feeler rake, so preventing its rotation. The digit wheels may have a two-part construction, Fig. 6 (not shown), one part carrying the teeth and the other the cam and deep notch, or may be of unitary construction, Fig. 7 (not shown). If the counter includes electromagnetic resetting means an associated relay gives an output if the counter is not correctly reset. This output may be used to initiate a further resetting operation.