Patent GB-845545-A (GB)
Title: A device for recording measure units, particularly weight units
IPC: G01G23/18
Filed: 1956-06-22
Abstract: 845,545. Electric selective signalling. KOOPERATIVA FORBUNDET ECONOMIST FORENING. June 22, 1956 [June 23, 1955; May 29, 1956], No. 19501/56. Class 40 (1). An electrically-operated indicator for a weighing-machine or the like, of the type in which denominational members are set according to the weight and co-operate with feelers, comprises a disc 5 attached to a shaft 4 of the weighing-machine, which is provided with holes 6 corresponding to tenths, projections 7 corresponding to units, projections 8 corresponding to tens and a projection corresponding to onehundreds. A movable holder 9 carries pins 10, which co-operate with holes 6 and have a vernier relation, pins 11 which co-operate with projections 7, pins 12 which co-operate with projections 8, and a pin 39 which co-operates with the " hundred " projection. The capacity of the scale is 100 kilogrammes. Each of the pins on the holder co-operates with a pair of contactsprings 17 and when the electromagnet DR is energized the holder 9 is moved towards the disc 5. The contacts for the pins 10 are normally closed, but only those associated with the pins 10 which pass through the holes 6 remain closed, the remaining contacts on the pins 11, 12 and 39 being normally opened and selectively closed by whichever pins are in contact with their corresponding projections. As shown, in Fig. 3, the " hundred " switch is connected via contacts a5, u5, to a relay AB, the " tens " switches are connected to relays U to AA, respectively, the " units " switches are connected to relays K to T, respectively, and the " tenths " switches are connected via contacts j1, and a1 to i1, to relays A to J, respectively. In operation, with mains switch Hs on, the start button St is pressed, and assuming that the scale is unloaded, i.e. zero reading, relay HR is energized and is held over hr1, and is followed by DR which moves the holder 9 towards disc 5, and via contact dr energizes motor M driving arm m of a selector switch. The switch 17 operated by the " zero " pin 10 remains closed and energizes relay A which is held over a2. Similarly the switch operated by the " zero " pin 11 is closed and operates relay K, which is held over k3, and the switch operated by the " zero " pin 12 is closed, energizing relay U, which holds over u3. The " hundred " pin 39 does not close its switch and relay AB is not energized. When the arm m of the selector switch reaches contact 1 relay AE picks up and holds over ae1, and through ae2 contacts the supply to the common line 18. When the arm reaches contact 2 AF is energized and holds over af1, contacts af4 release DR, and contacts af5 disconnect line 18, Fig. 1. With arm m on contact 3, the " hundreds " circuit is tested and via contact abl and line O applies a potential to a recording-device. On contact 4 the " tens " circuit is tested and via contacts u1 applies a potential to line O, and on contact 5 the " units " circuit is tested and via kl a potential is applied to line O. Similarly, on contact 6 the " tenths '' circuit is tested and a potential is applied via contacts a3 to line O. On contact 7 a potential is applied to a release magnet, at the recording- device, relay OR is energized and releases HR and the apparatus reverts to normal. Assuming a weight of 99.9 kilogrammes, the switch 17 corresponding to the " ninth " pin 10 is operated, the switches corresponding to the " zero " and the " ninth " pins 11 are operated, the switches corresponding to the " zero " and " ninth " pins 12 are operated, and the switch corresponding to the " hundred " pin 39 is operated. Thus relays J, K, T, U, and AA are operated. Relay AB is not operated since contacts a5 are open. Relay J via contact j3 completes the " tenths " circuit via line 9 to the recording device, and relay T via contact t1 completes the " units " circuit to line 9 and through contact t2 breaks the circuit which would otherwise be completed by relay K to line O. Relay AA via contact aa1 completes the " tens " circuit to line 9 and via contact aa2 opens the circuit to line O which would otherwise be completed through relay U. When the arm m moves to contacts 3, 4, 5 and 6, the circuits are tested as before. When 100.0 kilogrammes is to be recorded, relays A, K, T, U, AA, and AB, are energized. Relay A completes the circuit for line O to the recording machine, relay T, via t1, completes the circuit for line 9, and via t2 opens the circuit to line O which would otherwise be completed by relay K, but relay AD is energized via contacts k4, t4, a4, and reverses the connections to lines O and 9, whereby only the circuit to line O is completed. Similarly, relay AA via aa1 completes the circuit to line 9 and via aa2 opens the circuit to line O which would otherwise have been completed by relay U, but AC is energized over contacts u4, aa4, and kk1 and reverses the connections to lines O and 9. Relay KK is energized via k4, t4, a4, t6, k5, and via kk2 completes the circuit for AB, which via ab2 completes the " hundreds " circuit to line 1.