Patent GB-513811-A (GB)
Title: Improvements in impulse registering devices of the type used in telephone systems
IPC: H04Q1/34
Filed: 1938-07-20
Abstract: 513,811. Automatic exchange systems. GENERAL ELECTRIC CO., Ltd., PUCKETTE, C. C., and DEWAR, G. July 20, 1938, No. 21485. [Class 40 (iv)] In an impulse regenerator comprising a plurality of storage wheels, the wheels are rotated to store impulses by a magnet and armature common to them all, the impulses are counted out by a similar magnet and armature and means is provided for continuing impulsing out until all the stored impulses have been sent out. General operation. When the regenerator is seized relay A, Fig. 6, operates, B follows and remains operated, and C operates during impulse trains. Each impulse operates a magnet 4 to move a storage wheel 7 by means of the pawl 6. When C releases, the magnet 5 releases to associate another wheel 7 with the magnet 4 and to close contacts 11 by operation of cams 9, 10 (see Figs. 2, 3). An impulse machine connected to 22 then operates the magnet 12 and pawl 13 to step the wheel 7 back to its initial position where it encounters a stop. Each time the pawl 13 operates, a cam 15, pivoted at 57, opens the contacts 3 to repeat the impulses stored. The cam 15 and contacts 13 may be adjusted to vary the impulse ratio, or the contacts 13 may mask the generating contacts of an impulse machine. When all the impulses have been counted out and 7 meets the stop, contacts 17 (see Fig. 1) are closed so that the impulse machine operates the magnet 16 to step on the sequence switch 24. Every tenth contact of the switch is connected to the magnet 12, the others being connected to 16. The wiper 23 has to step on ten contacts before 12 is operated to count out the impulses stored on the next wheel 7 which is brought into operation by a device controlled by the wiper shaft of the switch. The time taken for the wiper 23 to step on ten contacts defines a minimum interdigital pause. The switch comprises two banks of contacts, only one being shown, so that five digits are counted out in one complete revolution of the wiper arm. Constructional features. Five storage wheels 7 (only four shown in Fig. 4) slotted at 42 are mounted on a shaft 27 and another shaft 43 engaging the slots serves as a stop. Each wheel is engaged by a retaining spring 40. The armatures of magnets 4 and 12 each carry five pawls 6, 13 respectively. The pawls are pivoted to the armatures and are biassed into engagement with the storage wheels by springs. Slotted barrel cams 29, 35 determine which one of each set of pawls shall be effective. The cam 29 is controlled by the magnet 5 through a pawl 30, Fig. 1, ratchet 31, gear 32, and a small gear (not shown) on the shaft 45. The cam 35 is rotated by the spindle of the switch 24. After storing or counting out a complete digit, the appropriate barrel cam is rotated a fifth of a complete revolution to bring the next wheel 7 into use. The device controlling the contacts 11 consists of two slotted cams 9, 10, Figs. 2, 3, which keep the contacts closed if the slots are not in line. Cam 10 is controlled by cam 29 through gears 46, Fig..4, and 44, Fig. 3. An arm 18 is controlled by cam 35 through gears 39, 48. A spring 64 tends to keep the slots out of line. Normally, when no digits are stored, the arm 18 engages a pin 19 on the cam 9, stretches the spring 64 and holds the slots in line. When a digit is stored, cam 10 rotates 72 degrees anticlockwise, Fig. 2, and allows 64 to contract and pull the slots out of line. When the digit is repeated, 18 moves 72 degrees engaging pin 19 to extend the spring again and bring the slots into line. The slots come into line and the contacts 11 open when all the stored impulses are sent out..