Patent GB-765035-A (GB)
Abstract: 765,035. Electric indicating systems. C.O.R.E.I. COMPAGNIE DE REGULATION ET DE CONTROLE INDUSTRIEL. March 16, 1955 [March 24, 1954], No. 7643/55. Class 40 (1). [Also in Group XIX] Apparatus for recording successive values of a plurality of variables comprises a plurality of printing carriages 10 movable along guides 3 regularly disposed round a rotatable support 1, 2, each carriage 10 being positioned along its guides in accordance with the value of one of the variables and the support being intermittently rotated whereby to bring the carriages, thus positioned, successively to operative position D with respect to the chart 42 for printing a dot thereon. Cyclic drive. The carriages 10 slide on pairs of guides 3 supported by end-plates 1, 2 secured on a shaft 4 to which is fixed a six-armed Maltese Cross 5 turned 60 degrees intermittently by a motor-driven pinion 6, thus carrying each carriage 10 repeatedly through a cycle of six positions A, B, C, D, E and F and simultaneously advancing auxiliary drums 27, 37 and a cam-shaft 46 each through corresponding cycles. Measuring. Cams 47 on the shaft 46 actuate switches 48 to put six thermocouples 58 successively into circuit with a source of direct current 60, a two-way relay 59 and a potentiometer 25 fixed parallel to the shaft 4 and contacted by the brush 24 on the carriage 10 then in position A. To complete the circuit the brush 24 contacts through another brush one of the guides 3 which contacts through a brush 12 a stationary contact 54 connected to the relay 59. The relay 59 responds to a difference in potential between the thermocouple 58 and the brush 24 to control the direction of rotation of a motor 61. The motor 61 drives the carriage 10 along its guides 3 by means of a gear-wheel 26 meshing with a carriage gear-wheel 9 actuating screw-and-nut means with the result that the brush 24 traverses the potentiometer 25 in a direction to balance the potentials and the carriage 10 is set along its guides 3 in accordance with the temperature sensed by the corresponding thermocouple 58. Inking and printing. On each carriage 10 an arm 15, provided with a rounded printing head 16, is pivoted on a pin 13 by integral lugs 14 carrying at their lower ends a rod 18. The rod 18 carries an iron disc 21 and enters a coil 19 within a magnetic armature 20. The ends of the coil 19 are connected to the brushes which sweep the guides 3 whose brushes 12 engage pairs of fixed contacts in positions C and D so that while a switch 52 is actuated for a short time by the driving pinion 6, the coils 19 of the carriages 10 in positions C and D are connected in parallel and are energized to swing their arms 15 against the action of restoring springs 22 and cause their heads 16 to be inked and to print respectively. The auxiliary drum 37 opposite position C comprises six felt covered rollers each impregnated with ink of a different colour to characterize the corresponding carriage 10 and thermocouple 58. A transparent record sheet 42 travels over a guide surface 44 with a window in position D having disposed in front thereof a transparent plate 45. Signalling particular values. The auxiliary drum 28 opposite position B comprises six carriages 29, which may be manually set by screw-and-nut means against a scale 53 to predetermined positions along guides 28 parallel to the shaft 4. When a carriage 10 reaches position B the brush 12 on one of its guides 3 engages a fixed contact and, if its brush 24 engages the preset carriage 29, a circuit is completed to a lamp to signal that a predetermined temperature has been reached. The lamps may be replaced by relays actuating other apparatus. Indicating at a distance. Each carriage 10 may carry a reflecting prism which, when in position D, receives a beam of light parallel to the shaft 4 and reflects it towards the record chart 42 through which the value may be read from a distance.