Patent GB-686030-A (GB)
Abstract: 686,030. Workmen's time-recorders. STOCKALL, MARPLES & CO., Ltd., and STOCKALL, J. J. May 21, 1951 [May 24, 1950; Nov. 24, 1950], Nos. 13016/50 and 28788/50. Class 106 (iv). A workmen's time-recorder ribbon-colour change mechanism comprises a 24-hour disc arranged adjacent and parallel to the wheels carrying the stamping dies and carries movable projections for actuating a lever connected to the ribbon-colour change arm and a resilient abutment engages each projection in turn to resist the rotation of the 24-hour disc shortly before the latter reaches the position which it occupies at the moment when the engaged projection actuates the lever, the resistance to rotation of the 24-hour disc being maintained until after the actuation of the lever. A clockdriven spindle 10, Fig. 1, carries both a bevelgear 11 driving wheels 12 carrying stamping dies and also a worm 13 rotating a spindle 15 once every 24 hours through a worm-wheel 14 to which is secured adjacent and parallel to the wheels 12 a 24-hour disc 16 carrying movable projections, each with a drop-off dog 17 which raise and let fall a lever 18 connected through a spindle 19 to a ribbon colour change-arm 21. The spindle 19 is mounted in a bracket carrying the colour change mechanism while the spindle 15 is mounted in a bracket carrying the wheels 12 and may be the spindle which carries a pinion meshing with a rack of a card lifter and may carry a two-lobed cam actuating a wheel carrying a.m. and p.m. stamping dies. When a dog 17 lifts the arm 18 against the action of a spring 22 acting on the arm 21 and allows it to fall, a stirrup 23, pivoted on the arm 21 and linked by a spring 25 to a lever 24, advances one tooth a 12-tooth locking-wheel 26, and a 6-lobe cam 27 either lifts or lowers a lever 35 and through a link 36 lifts or lowers a fork 37, 38 to align one of its arms with one or other of the arms 41, 42 of a fork which supports one ribbon spindle 43 and is connected by a shaft 44 to a support 45 for a second ribbon spindle 46, thus setting the parts so that when the recording mechanism is next actuated the appropriate coloured ribbon will be operative. As the arm 21 falls a tooth 32 on the lever 24 engages a projection 30 on a locking arm 28 and moves a tooth 29 out of engagement with the wheel 26 and thereafter the tail 33 of the lever 24 engages a fixed pin 34 causing the tooth 32 to release the arm 28 for relocking the wheel 26. The movable projections may comprise a pair of plates 47, 48, Fig. 3, clamped to the disc 16 by a screw 49 each with a projection entering an annular groove in the disc 16, the plate 47 carrying the dog 17. Another form, Fig. 6, comprises a saddle-piece 50 to which a clamping- plate 51, engaging an annular groove in the plate 16, is secured by a screw 52. Dogs 17, 53 are carried by the saddle-piece 50, the dog 17 having a flat rear face and being screwed in so that after clamping the projection to the disc 16 in approximate position a final adjustment may be made by rotating the dog 17. A further form, Fig. 5, comprises two plates 54 secured together by a screw 55 and having inclined upper surfaces co-operating with a roller 56 on a modified lever 18 having a drop-off edge 64. Shortly before the lever 18 drops behind a dog 17, the dog 53 or screw 49 engages a leaf-spring 58 which prevents undesirable back-lash. In a modification, Fig. 2, the dog 53 or screw 49 engages a lever 59 mounted on a fixed pivot 60 and loaded by a plunger 63 held in a screwthreaded tube 62 passing through a fixed arm 61 with a compression spring housed in the tube. Additional projections or recesses may be provided on one or both sides of the 24-hour disc to control other actions, e.g. a switch in the circuit of a bell or a " shift-change " mechanism to move the record card holder so that recording will be in the appropriate " in " or " out " column on the card.