| 摘要 |
661,411. Date indicators. KAMPEN, M. T. VAN. Feb. 1, 1949 [March 18, 1948], No. 2749/49. Class 106 (iv). In a date-indicator a driving arm 14 with a spring-pressed catch 22 is driven with the hour hand of a clock and in alternate revolutions engages with a pin 23 a large or small tooth of a wheel 52 to be guided outside a blade 51 or inside to follow the contour of a fixed disc 8 which has a depression to expose a tooth 16 of a day name disc 5 further depressed potentially to expose a tooth 19 of a month name disc 6 and again to expose a tooth 20 of a number disc 7, these arcuate depressions being suitably dimensioned and spaced so that each day the driving member 14 advances the day name and number discs to expose the day and date through windows in the discs 7, 8 and in the clock dial. The number disc 7 carries a pivoted pawl 25 provided with a spring tail 28 and a tooth 26 extending backwards through the plane of the disc 8 whose inner periphery 30 it follows and a tooth 27 extending forwards through the plane of the month disc 6 lying normally within a sleeve 9 fixed to the clock dial 1, which sleeve forms a bearing for the three discs 5, 6, 7 which are spaced by fixed washers 10, 11, 12. The inner periphery of the month disc has twelve depressions suitably dimensioned and spaced according to the lengths of the months; the fixed disc 8 carries a rotatable wheel 46 formed with two sets of three depressions 49 alternating with high faces 47. Towards the end of each month the spring tail 28 engages a pin 29 in the fixed disc 8 which urges the teeth 26, 27 radially outwards through gaps in the peripheries of the discs 6, 7, 8 and sleeve 9 unless otherwise prohibited. Thus in a month of 31 days the teeth 26, 27 cannot swing outwards until the number disc begins to advance at the end of the 31st day and allows the tooth 27 to slip into an appropriate depression in the month disc which it then advances to expose a tooth 19 in the path of the pin 23 which subsequently advances it. At the end of the last day of a shorter month the number wheel advances and the appropriate depression in the month disc allows the tooth 27 to swing outwards and put the tooth 26 in the path of a pin 45 on the driving-arm 14 which then advances the number disc to one and in passing through the 31st position advances the month disc as before. At the end of February in normal years the tooth 26 engages a depression of the wheel 46 and advances it one step so that at the end of the 28th day of February in a leap year a high face 47 of the wheel prevents the tooth 26 from advancing the number disc until the end of the next day when it will advance the wheel 46 and effect transfer to the first of the next month as before. |
