Patent GB-190524039-A (GB)
Title: Improvements in or relating to Automatic Date Indicators
Inventor: PERSSON PER ERIK
Filed: 1905-11-21
Granted: 1906-02-22
Abstract: 24,039. Persson, P. E. Nov. 21. Calendar mechanism.-A clock-actuated date indicator comprises four cylinders 8, 9, 10, 11, as shown from behind in Fig. 2, which are rotated, preferably from the striking-train, by a star-wheel and a crank linked to a transverse pivoted lever 4. This actuating-lever is arranged to be lifted at noon and lowered at midnight by a star-wheel and cam device acting suddenly. The day cylinder 8 is driven by a pawl on a balanced lever pivoted on the common spindle 7 and linked to the actuating-lever 4. The date cylinder 10, having figures from 0 to 9, is driven similarly by a lever 21, Fig. 3, and carries a tooth 30 for transferring to the tens' cylinder or sector 9, shown as a halfcylinder. This tens' sector 9 has three spring pins 23, Fig. 2, projecting towards the day cylinder in the path of a cam-plate 24. At the beginning of each month, this cam - plate is rocked through links by the raising of another lever 22 on the spindle 7. This is effected by the actuating-lever 4 when the month indication is changed. The cam-plate 24 is shaped to press back the uppermost spring pin 23 into the path of the transfer tooth 30, so that after one revolution of the date cylinder 10 this tooth, engaging the uppermost pin, moves the tens'sector one division. This pin is then free of the cam-disk and rests on the top of it, but the next pin is pressed back into the path of the transfer tooth and is acted upon similarly. At the end of a month, the camplate 24 is rocked back when the month-changing lever 22 is lowered, and thus allows the tens' sector to be returned by a weight or spring. This lever 22 is raised by the actuating-lever 4, and, with the month cylinder 11, is held during the month by the end 37 of a lever 36 engaging one of twelve projections inside the month cylinder. The other end of the locking-lever 36 is slotted for the passage of a doubly-notched piece 35, pivoted to the date-changing lever 21. This notched piece is also connected by pin and slot to a rod linked to the framework and to the tens' sector 9. This causes the upper notch of the piece 35 to engage the edge of its slot after thirty days and to depress the locking-lever 36 on the following day. This action lifts the locking end 37 over a projection in the month cylinder corresponding to a thirty-day month but only into a notch in the longer projection of a thirty-one-day month. In the first case, the month changing lever 22 is free to rotate the month cylinder 11, and in the latter this action is delayed for a day until the second notch on the piece 35 raises the locking end 37 over its projection. In this case, moreover, for the commencing day of the next month 1 has to be shown on the date cylinder 10 and not 2, and to effect this the additional lift given to the locking end 37 is used to raise a slide 41 and by a bell-crank and link to withdraw the date-changing pawl from action during the next depression of its lever 21. At the end of February, the date and month disks are adjusted by hand, the latter by rotation of its spindle 7 and the former by lever and pawl mechanism (not shown).