GB190926481A - Improvements in and relating to Time Stamps. - Google Patents

Abstract

26,481. Obermiller, M. W. Nov. 18,1908, [Convention date]. Detent and overt h r o w - preventing mechanism.-In a date and time stamp of the type operated electro-magnotically from a distant clock, and having type wheels operated by a stepped pawl-bar engaging with the various ratchet-wheels, cam-controlled locking-devices are provided to prevent movement of the type-wheels except at the required intervals. The electro-magnet 18, mounted in the base attracts momentarity at intervals the pivoted armature 23, and thereby, through the link 24 and lever 25 the movement of which is controlled by a stop 27 and spring 28, reciprocates the pawl frame 33, Fig. 3, pivoted on the shaft 32. While the frame 33 moves towards the left, the spring-controlled pawl bar 36, having pawls of various depths, rides over the ratchet-wheels connected to the day, hour, and minute printing-wheels, which are kept from moving by the pawls 43; and, at the end of the movement, a bar 31 engages with and lifts a cam 57 fixed to the pivoted locking pawls 48 and lifts them clear of the ratchet-wheels, so that one or more of them may be moved one step forward by the return movement of the pawl-bar 36. At the end of the return movement, the bar 31 engages with a cam-piece 50<a> at the end of a lever 50 attached to the pawls 48, and holds them against ratchet-wheels, which are thus positively locked against further movement until the next reciprocation of the pawl frame.