Patent GB-409006-A (GB)
Title: Improvements in calculating apparatus for calculations relating to statistics
Inventor: MATTHEW JOHN ALEXANDER
Filed: 1932-10-21
Abstract: 409,006. Calculating-apparatus; testing and registering strength of yarns. LINEN INDUSTRY RESEARCH ASSOCIATION, MATTHEW, J. A., and KEIG, R. J. B., Research Institute, Lambeg, Co. Antrim, Northern Ireland. Oct. 21, 1932, No. 29440. [Classes 106 (i) and 106 (ii).] Calculating- apparatus for determining the number of items in a set and the total of the items comprises a shaft differentially rotated for each item, a sleeve which can be fixed to the shaft, an arm on the sleeve operating a first counter for counting the number of the items, a wheel loose on the sleeve and carrying a plurality of pins operating a second counter giving the total of the items, a second arm on the sleeve carrying a spring pawl engaging ratchet teeth on the wheel, and a retaining pawl for the wheel. In the form described, the apparatus has a third counter giving the number of items which exceed a predetermined value and a fourth counter for the sum of the excesses of said items above the predetermined value. A sleeve D, Fig. 2<a>, carries three arms, H, K, L, and is secured to a graduated setting wheel E. The first arm H actuates a counter C<1> one step each time the setting wheel is moved, this counter giving the number of items entered. Each item is entered by turning the setting wheel an amount corresponding to the item as indicated by a fixed pointer F. The total of all the items is shown on a counter C<2> actuated by a pin-wheel N driven from the arm K by ratchet gearing b<3>. The sleeve D surrounds a shaft A provided with a disc B which can be adjusted angularly with respect to the wheel E and then locked thereto by a screw G. The shaft A carries an arm M having a pin m which can engage an arm S secured to a shaft R. The arm L on the sleeve D can also engage the arm S to restore it to its initial position. The angle between the arms M, L is set to a predetermined value by setting the disc B relative to the wheel E. The wheel E must thus be moved an angle corresponding to this value before the arm M contacts with the arm S. A counter C<3>, driven by the arm M, registers the number of items which exceed the predetermined value, whilst a counter C<4>, driven from the shaft R by an arm V, ratchet gearing b<3> and pin-wheel W, registers the total of the excesses of such items above the said value. The calculating apparatus is shown in Fig. 3 arranged for direct actuation from a machine for testing the strength of yarns. The yarn 7 is attached to a spring balance 1 and to a rod 5, Fig. 4<c>, carrying a valve which normally closes an opening 52 in a piston 51 moving in an oil cylinder 3. When a tube 4 attached to the piston 51 is released by a catch 8 the piston descends and oil passes through the opening 52. The weight of the rod 5 is thus gradually transferred from the piston 51 (on which it normally rests) to the yarn 7. When the yarn breaks, the rod 5 falls to close the opening 52 and the piston remains stationary until restored by hand. A lever 22 is rocked as the balance 1 extends and lowers a cord 21 connected to a rod 20, Fig. 4<c>, carrying a valve 41 which is thus moved to allow a piston 34 to fall by its own weight in an oil cylinder 19. The piston 34 carries a tube 18 connected by cords 15, 16 to the calculating machine C<1>-C<4>. When the yarn breaks, the valve 41 closes and the motion of the calculating machine is stopped, one item having been entered. The tubes 4, 18 are restored simultaneously, the valve 41 being opened to facilitate the lifting of the piston 34. The cords 15, 16 actuate the calculating machine through a cord 11 and pulley 9, which latter is returned to its initial position after each test by a weight 12.