Patent GB-191395-A (GB)
Title: Apparatus for indicating, recording and integrating values of any kind
IPC: G08C15/08
Filed: 1923-01-06
Abstract: 191,395. Roucka, E. Jan. 7, 1922, [Convention date]. Indicating; recording by co-ordinates; integrating; damping-arrangements. - In a system for giving an indication &c. of measured physical &c. values or for controlling apparatus in accordance therewith, a movable indicating member is normally locked while an auxiliary force is varied, the arrangement being such that when an indication is to be given or when the auxiliary force has a value corresponding to the value to be indicated, the movable member is momentarily released and is moved by the force to an appropriate position. As shown in Fig. 1, a resistance coil 158 carrying current from the source 160 is arranged in series with one of a number of thermocouples 152, 154, 156 across the relay 172. The thermocouples are connected in this circuit in turn by the distributor g. If the E.M.F. of the coil 158 is not equal and opposite to that of the thermocouple 154 in the case shown, the relay is operated and the motor 180 operates the slider 164 to vary the current through coil 158 until the E.M.F. across it balances that of the thermocouple. At the same time the current in coils 210, 310 is varied and pointers 212, 312 tend to move but are restrained by springs 204, 304. At the end of the period allotted to the thermocouple 154 the distributor through contact 182 sends an impulse to energize momentarily the magnet 302 and so release the pointer 312 which thereupon assumes a position depending on the strength of current through the coil 310, a record being made on the strip 316. The other indicators are similarly operated. In a further example, Fig. 2, in which a record is required of the movements of a pointer 4, the latter has at its end a flexible conducting strip 6 adapted when depressed to bridge conducting strips 8 in the circuit of a relay 90 which on being energized sends through contacts 94, 499, a momentary impulse to the line 24. The strip 6 is depressed by a member 10 shaped as shown in Fig. 3 and operated by a cam 15 on a constantly driven shaft during a third of its rotation. The point of the rotation at which the circuit of relay 90 is completed thus depends on the position of pointer 4. At the receiver a similar, synchronously-driven cam 60 oscillates the member 50 which is connected by a spring to the arm 30 of the recording member which is normally locked by the member 44. At the instant contacts 8 at the transmitter are bridged, the impulse sent out by relay 90 momentarily energizes magnet 46 and releases the arm 30 which takes up a position corresponding to that of the arm 50 at that instant. A second release on the return of armature 93 is prevented by the interruption of the circuit by the commutator 64. The swing of arm 30 is damped by magnet 40. Operation of the other systems b, b<1> and c, c' is exactly similar during the remaining two-thirds of the rotation of the cam shafts. A modified method of connecting the recording pointer to the member controlling the variable force is shown in Fig. 10. An auxiliary shaft 104 is connected through pin 106 and spring 114 with a member 100 corresponding to the part 50 and similarly by a spring 116 with the shaft 102 of the recording pointer. The shaft 104 also carries fixed arms 110, 112, which in the zero position, come in contact with the parts 106, 108. In a further modification, Fig. 12, the lever 120 corresponding to the shaft 102, Fig. 10, has its end 128 between two springs 130, 131, carried by a member 124 corresponding to the part 100. In an apparatus for registering or integrating, Fig. 13, a part 232 carrying counting mechanism is adapted to be oscillated by an arm 233 connected to a member corresponding to pointer 30, Fig. 2, to move a friction wheel 244 over the surface of a constantly rotated disc 242, and thus determine the rate at which the counter is operated.