Patent GB-383638-A (GB)
Title: Improvements in and relating to automatic registering devices
IPC: G01G23/18
Filed: 1931-05-21
Abstract: 383,638. Electric signalling systems. BAUML, M., 37, Porzellangasse, BONWITT, W., KUHNEL, R., SAHALKHAMMER, J., HOLITACHER, P., (trading as NORMA INSTRUMENTENFABRIK BONWITT & CO.), 11, Fickerysstrasse, both in Vienna. May 21, 1931, No. 15002. [Class 40 (i).] In a measuring instrument, more particularly a weighing machine wherein a member having groups of digital elements co-operates with a similar member in accordance with the setting of the instrument to effect the operation of type-wheels, auxiliary contacts are provided on the members at points corresponding to the points of transition between consecutive digits of the higher digit denominations in order that inaccurate registration at the points of transition may be avoided. In Fig. 1, the spindle of the measuring instrument controls a disc 4 having groups of units tens and hundreds digital elements A, B, C arranged as shown in Fig. 2. A disc 5 carries corresponding groups of contacts a, b, c, Fig. 3, and the arrangement is such that after the pointer 2 and disc 4 have taken up their measuring positions, relay V is operated to move the disc 5 in the frame 6 into engagement with the disc 4 in order to effect selection of contacts in the groups a, b, c appropriate to the setting of the pointer. The selected contacts are thereby opened and effect the control of corresponding chain of relays, Fig. 5, to operate the corresponding stripping magnets Ra, Rb, Rc of the type-wheels. For the purpose of precluding the registration of wrong numbers at the transition points from one numeral to the next higher in the higher digit denominations, groups of auxiliary elements HB, HC1, MC2, &c ; and contacts hb1, hb2, etc.; hcl, hc2, &c., Fig. 6, are provided on the discs 4, 5 at the points of transition and ensure correct operation of the typewheels. Fig. 5 shows the equipment for transmitting impulses to the stepping magnets of the type-wheels. Assuming the pointer 2 comes to rest at indication " 66 " relay V then operates to move the disc 5 and effect operation of contacts a6, b6. The relays X, Y in the digital chains are normally energized so that upon operation of the contacts a6, b6, corresponding pairs of relays X6, Y6 are de-energized. The Y relays are slow release so that when relays X6 release contacts x<1>6 close to impulse the stepping magnets Ra, Rb. The relays Y6 then open contacts y<1>6 to terminate the impulse and close contacts y6 to short-circuit relays X5, Y5 the release of which initiates transmission of another impulse. This operation is repeated to transmit stepping impulses to the respective digital magnets until upon operation of relays X1, Y1 contacts y1 prepare the circuits of relays Z. When the pointer 2 is returned to normal, e.g. upon removal of the article to be weighed from the weighing machine relay V1 is released and contacts v1 are closed to cause energization of relays Z, which at contacts z1 .. z9 reenergize the relays X, Y and thereby restore the equipment to normal ready for the next registration. The auxiliary elements and contacts are arranged so that co-operation takes place prior to co-operation between the members A, B, C and contacts a, b, c. The auxiliary contacts h6 are arranged in series with the contacts b so that operation thereof produces stepping of the associated relay chain in a manner similar to that previously described. Moreover the auxiliary contacts when operated interrupt the circuit of the lower digital magnet to prevent incorrect operation. In a modified system of registration, adapted for the registrations of the measurements of instruments having fine graduations, the elements A, B, C are replaced by contacts, the members carrying the contacts being continuously driven by an external source of power, the member carrying the '' units contacts being driven at a higher speed than the member carrying the tens " and " hundreds '' contacts. The latter member also carries a lamp which during rotation throws a beam of light through an aperture in a member controlled by the pointer on to a selenium cell. The rotatable contacts cooperate with stationary groups of digital contacts and the arrangement is such that when the pointer comes to rest the selenium cell is illuminated to initiate a registration corresponding to the stationary contacts selected at the moment. Relays in the corresponding digital chains are operated and the chains run off to operate the stepping magnets of the type-wheels.