Patent GB-227883-A (GB)
Title: Improvements in apparatus for measuring, indicating or recording quantities or qualities of any kind
Filed: 1923-08-22
Abstract: 227,883. Roucka, E. Aug. 22, 1923. Differential speed indicators; speed indicators with recording-apparatus. - In a system for measuring at a distance the variations in the reading of a speedometer a movable member actuated bv the variations co-operates with a continuously oscillated member to produce impulses of electrical energy which operate synchronous receiving apparatus. The speed of the movable member determines the position of the impulse in a time interval and this position serves as a measure of the variation. A member 2 is rotated by means sensitive to the variations of speed. A disc 4 is mounted on a shaft 10 carried by a lever 12 pivoted at 14 and carries an arm 6 provided with contacts 40, 44. At the commencement of a cycle of operations the contacts 40, 42, 36 are closed, the latter being held closed by a projection 26 which holds down an armature 28 of an electromagnet 32. Under these conditions the electromagnet 24 is energized and the armature 22 is attracted to swing the disc 4, against the force of the spring 16, into engagement with the member 2. The projection 26 is thus displaced and movement of the armature 28 by a spring 30 breaks the contacts 36 and makes the contacts 34. The disc 4 is then driven frictionally by the member 2 and the arm 6 is moved away from the contact 42. The disc 4 is held in contact with the member 2 by a lip on the armature 28 engaging the projection 26 of the armature 22. Simultaneously with the movement of the arm 6, a contact 46 carried by a lever 48 is moved towards the arm. A lever 54 carrying electromagnets 56 and pivoted coaxially with the shaft 10 is oscillated continuously by a cam 74, Fig. 3, driven by a synchronous motor 78. The lever 48 is pivoted coaxially with the shaft 10 and carries by a spring 64, Fig. 2, a head 62 arranged within a slot 60 of the armature 58 of the electromagnets 56. The lever 48 is held normally against a stop 50 by a spring 52. The circuit of the electromagnets 56 is closed for the measuring time interval by the segment 84 on a rotating switch 82. Upon energization of the electromagnets 56, the armature 58 is attracted and the lever 48 is carried toward the arm 6 to finally complete the circuit at the contacts 44, 46 from the source 80 of auxiliary energy to the electromagnets 92 of the receiver. The armature lever 96 thus forces a pen 104, which is oscillated by a synchronous motor 116, into contact with a record strip 100. As soon as the impulse is produced the magnet 32, which is in circuit, attracts the armature 28 to (1) disengage the contacts 34 and break the circuit of the electromagnets 56 to allow the lever 48 to assume its normal position, (2) release the projection 26 and allow the disc 4 to move away from the member 2 under the action of a spring 16 and also allow the contact 40 to re-engage the contact 42 under the action of a spring 8, and (3) complete the circuit at the contacts 36, in order that the cycle of operations may be repeated. The position of the impulse in the time period of the arm 48 depends on the speed of the member 6 and thereby forms a measure of the quantity actuating the sensitive member 2.