Patent GB-196667-A (GB)
Title: Improvements in or relating to speed, time and work recording instruments
IPC: B41J35/22
Filed: 1922-01-23
Abstract: 196,667. Jackson, W. J. Mellersh-, (Bruce, W. M., and Matheson, J. N.). Jan. 23, 1922. Recording by co-ordinates; recording by distinctive marks.-Relates to apparatus of the periodic counter type for indicating and recording the speed, time, and quantity of work done by a machine or self-propelled vehicle and consists in the provision of a pair of racks one of which, viz. the transmission rack, is reciprocated by a spring - controlled oscillatory pinion actuated by the shaft of the machine, &c., under observation, and which is adapted to actuate a parallel recording rack that carries a pencil in contact with a clock-driven record strip and operates a second spring-controlled pinion which co-operates with an indicating pointer. Means are also provided for recording the number of revolutions or distance travelled, for rotating the recording pencil, and for preventing damage if the clockwork should stop. The mechanism comprises a shaft 13, Fig. 1, operated through a unidirectional drive 14 by a shaft 15 which can be coupled to a shaft of a machine or rotating part of a vehicle; the shaft 13 carries a worm 12 which through gearing 10, 11 drives a master-wheel M, Figs. 8, 9, with gear teeth 9, ratchet teeth 8, and crown ratchet teeth 7, fixed to a sleeve 4<a> rotatably mounted on a shaft 4. On the shaft 4 an oscillatory pinion 16 controlled by a spring 17 is loosely mounted and is provided with lugs 20 which support a rocker bar 18 carrying a spring-controlled pawl 21 adapted to engage the ratchet teeth 7. The pawl 21 is released periodically from the master-wheel M by means of the head 27 of a skeleton sleeve 23 which is raised by the pins 29, Fig. 5, of a rocker 28 when the arm 30 thereof is rocked by a spring- controlled lever 31, Fig. 10, associated with a cam 36 on the spindle 37 of the clock escapement wheel. A pawl 38 engaging with the ratchet teeth 8 is provided with an adjustable stop 40 to regulate the action of the pawl 21. The pinion 16 engages a transmitting rack 48, Fig. 11, slidably mounted on one side of a slotted bridge member 43 on the other side of which is a second rack 49 having projections 50 in front of similar projections on the rack 48. The rack 49 engages a spring-controlled gear wheel 55, Figs. 3, 11, on the spindle 57 of which is fixed the speed indicating pointer that co-operates with the scale 3 shown in dotted lines (Fig. 1). At the lower end of the spindle 57 is provided a ratchet wheel 58 with which engages a pawl. 59 adapted to be periodically released therefrom by a lever 60 actuated by an arm 62 on the escapement wheel spindle slightly in advance of the release of the pawl 21. The rack 49 carries a pencil 63, Fig. 3, mounted on a spindle in bearings 65 and which is provided with a pinion 67 engaging a rack 68 reciprocated by a lever 70 attached to an extension 69 thereof and having a roller 72 engaging a star wheel 73 on the shaft 13 which causes the pencil to rotate to ensure a plain marking. To record the distance travelled or revolutions in a given period a second pencil 81, Fig. 3, carried on a spring arm 80, is adapted to mark the edge of the record-strip by means of a projection on a rocking member 79 which is periodically struck by an arm 77 mounted on a spindle 76 rotated by worm gearing from the shaft 13. The record-strip passes from a slotted drum or roller 87 over a feeding roller 86 to a spring-controlled winding roller 88. The feeding roller 86 is provided with pins 95 engaging perforations in the edge of the record-sheet and is rotated by means of bevel gearing 83, 84 from the hour hand spindle 82. If the clockwork should stop, the pawl 21 is automatically released before the wheel 16 completes a revolution by means of a lever 97 controlled by a spring 198 and having a hooked end 98 which raises the pawl when the lever is pressed back.