Patent GB-377331-A (GB)
Title: Improvements in or relating to weighing apparatus
IPC: G01G23/18
Filed: 1931-05-08
Abstract: 377,331. Weighing-apparatus. JOKSCH, R., 18, Blechturmgasse, Vienna. May 8, 1931, No. 13718. [Class 143.] Indicating - mechanism ; printed records, apparatus for giving.- Relates to a weighing machine provided with an electrically driven and controlled indicating and recording device which is adjustable to the deflection of the pointer and which is put into operation by establishing contact at any given time between an arm of the weighing device and an arm of the indicating and recording device. According to the invention, when the weighing platform is loaded or unloaded a switch arm 14 rotating with the pointer shaft 9 comes into contact with a rotatable control arm 49 connected by means of a readily yielding connection having extensive lost motion, with the indicating and recording device, the connection between members 52, 53 and 55, 56 (which are in driving contact with one another) being effected by means of an external force, for example a weight 58 or 58a, the arrangement giving freedom of action to the weighing device, independence of speed to the indicating and recording device and avoidance of damage due to sudden loading or premature unloading. As shown, a toothed quadrant 8 secured to a pendulum-lever rotates the indicating spindle 9 in proportion to the load on the machine. The switch arm 14 terminates in a U-shaped bridge contact 22 situated loosely within the forked contact-bearing end 49a, 49b of the control arm 49 which is rigidly secured to a drum 51 mounted on a screwed spindle 23. Weighted conductors 60 are coiled round the drum 51 and are connected at one end to the contacts on the fork 49a, 49b, and at the other end to the leads 59 of an electric motor 30. A second drum 54 on the spindle carries the two stops 53, 55 engaging respectively the stop 52 on the drum 51 and the stop 56 projecting from a pinion 26. The electric motor 30 is in driving connection with the pinion 26 and with a series of weight-indicating discs 27a and type discs 31. The operation is as follows: when a load is placed on the machine the switch arm 14 rotates, closes the circuit of the motor 30 at the bridge contact 22 and displaces the control arm 49 an angular distance proportional to the load. The stop 52 simultaneously rotates the drum 54 thereby separating the two stops 55, 56. The motor 30 rotates the pinion 26 until the stop 56 again engages the stop 55 and thereby with the assistance of the weights 58 removes the contact fork 49a, 49b from engagement with the bridge contact 22 and arrests the motor, the weighing mechanism thus being entirely disconnected from the indicating and recording mechanism. The suspended weight 58a tends to maintain the stops 55, 56 in engagement and the motor is reversed by the fork contacts during the return movement. If the load is suddenly applied and the indicator spindle 9 makes more than one revolution, the screw thread on the spindle 23 temporarily displaces the drum 54 axially to prevent the stop 55 striking the opposite side of the stop 56. If the electric supply fails, or it is desired to adjust the weighing apparatus, the spindle 23 may be displaced to the right by means of a hook 34 to move the contact fork 49a, 49b clear of the arm 14.