Patent GB-326128-A (GB)
Title: Improvements in or relating to clock actuated calendars
IPC: G04B19/243
Filed: 1928-08-20
Abstract: 326,128. Tuma, M. Aug. 20, 1928. Date indicators.-A clockactuated calendar has a pair of numbered drums for the date figures actuated once a day by the striking mechanism of the clock, the units drum having five -rotatable plates with a figure on each side, the plates being automatically turned through 180‹ at the change of date while the tens drum has five faces marked with the figures 1, 2, 3, 3, and a blank respectively. As shown in Figs. 1, 2 and 3, the striking mechanism through gearing 1. 2 rotates a shaft 30 one revolution at midnight, the rotation being transmitted through bevel wheels 3, 4 to a train of gears 5 - - 9. The shaft 10 of the wheel 9 has keyed thereon a units drum 11 with five plates 12 each rotatable on an axis 13 and marked with the digits 0, 5; 1, 6; 2, 7; 3, 8; and 4, 9, respectively. During the movement of the drum the section 12<1> of a plate encounters a projection 17 on the casing to effect a turn over of the plate so as to present the second number of a pair of numbers to the inspection aperture 16 in the casing. The tens drum marked as above described is loose on the shaft 10 and is connected as shown in Figs. 2, 9 and 10 to mutilated pin wheels 22, 24 associated with transfer pinions 23, 25 for the purpose of effecting the transfer operations, the two toothed pinion 23 being active on the night of the 9th, 19th, and 29th and the four toothed pinion 25 being brought into operation on the 30th and 31st. The shaft 19 on which the pinions 23, 25 are mounted carries the wheel 8 composed of three sections, viz., a wheel 35 with twenty-two pin teeth, the pinion 8 proper with twenty teeth and a space, and a Geneva locking pin wheel 34. Projecting into the space between the sections 34, 35 as shown in a development, Fig. 5, are pins 8<1> for co-operation with the transmission pinion 7. The pinion 7 is integral with a two-toothed pinion 32, Fig. 7, co-operating with the section 35 and with a notched locking pinion 33 for the section 34. The composite pinion 32, 7, 33 rotates once a day and is laterally movable to one of four positions depending on the number of days in the month by mounting it on a shaft 31 displaceable under the control of cam members 38, 39 and 56. The shaft 31 is connected to a spring-controlled arm 36 provided with cam contact arms 58, 59 and 57 respectively. The cam 56 is adapted to displace the pinion 7 at the appropriate time during the month so that it is in a position at the end of the month to co-operate with two pins 8<1>, or no pins, or with four pins 8<1> or with six pins 8<1> for months with 30, 31, 29, and 28 days, respectively, whereby on these days the shaft 19 may be rotated through four, two, six, or eight steps respectively to bring the necessary units figure to view. The shaft 19, in addition to pinions 23, 25, carries a six-toothed pinion 42, Fig. 4, which on the 10th, 11th, 20th, 21st, 30th, and 31st of a month rotates a shaft 45 through a pinion 43 and by means of a single toothed member 46 on the shaft actuates once, a month a twelve-toothed pinion 47 connected to the cam 38. This movement is transmitted through pinion 48, 49 to an indicating hand 50 on the clock face co-operating with a month name indicating scale. The shaft of the pinion 48 carries a two-toothed pinion 51 cooperating with a pin wheel 33 carrying the cam 39 and geared to an indicator 54 for showing the ordinary and leap years. The adjustment of the cam 56 is effected by gearing connected with the pinion 43 as shown in Fig. 4. The day names are marked on an annular disc 26 rotatable on rollers 27 and provided with teeth 28 engaged by a pinion 29 on the actuating shaft 30. The sets of pinions described are associated with Geneva type locking mechanism which serves to hold the parts in adjusted position.