Patent GB-728630-A (GB)
Title: Improvements in integrating apparatus
IPC: G06G3/08
Filed: 1953-05-01
Abstract: 728,630. Integrating-apparatus. BAILEY METERS & CONTROLS, Ltd. May 1, 1953 [May 2, 1952], No. 12108/53. Class 106 (4). Integrating-apparatus of the kind having a driven shaft 9 coupled with a constant speed driving shaft 11 through friction means 13 and arranged to operate a register 8 and locking means including an escapement wheel 14 rotatable with the driven shaft 9 and a co-operating pawl 20 movable to and from a locking position and arranged to be located in part by means 28 for imparting an oscillation and in part by means responsive to a variable to be integrated, comprises auxiliary locking means 30 adapted through movement thereof from a locking position assumed while the locking means 20, 14 are effective to release the driven shaft 9 thus determining the commencement of the periods during which the register 8 is actuated. The pawl 20, pivoted on an adjustable arm 22, is urged into engagement with the escapement wheel 14 by its counterweight 24 unless engaged by a pin 25 adjustably fixed on a floating lever 26 oscillated up and down once in each revolution of the cam 28 fixed to the driving shaft 11 driven by a constant speed motor 12. The other end of the lever 26 is pivoted to a crank 6 positioned by a shaft 3 which moves a pointer 4 over a scale 5 or a recording pen over a time-driven record sheet in accordance with the value of a variable sensed by means 1, e.g. a Bourdon tube. Thus while the lever 26 is continuously oscillated the periods in each oscillation during which the pawl 20 frees the escapement wheel 14 to drive the register 8 through gearing 10 and driven shaft 9 are determined by the instantaneous value of the variable which is thus integrated by the register 8. In order to prevent a reaction between the escapement wheel 14 and pawl 20 upon unlocking from disturbing the indication or record the escapement wheel is turned back half a tooth division by the pawl 30 which takes over the locking function and allows the pawl 20 to swing clear at the appropriate time under control of the variable. While the pawl 20 is exercising its locking function, Fig. 2 (not shown), and the high dwell of a cam 33, also driven by the drive shaft 11, is rocking a lever 31 against the action of a spring 34, an adjustable eccentric pin 35 on the lever 31 holds the pawl 30 clear of the escapement wheel, when the cam follower 311 of the lever 31 has ridden down two-thirds of the fall to the low dwell of the cam 33 the pawl 30 engages a tooth of the wheel 14 and during the final third of the fall the pawl 30 drives the wheel 14 half a tooth division backwards thus leaving the pawl 20 free to swing clear at the appropriate time before the pawl 30 finally frees the wheel 14 when the follower 31<1> reaches the top of the rise to the high dwell of the cam 33. In order to pass the same number of teeth of the escapement wheel past the main pawl 20 during an integrating period when this type of integrating-apparatus is modified according to the invention it will be necessary to operate the motor 12 twice as fast. Specification 393,795 is referred to.