Patent GB-337916-A (GB)
Title: Improvements in or relating to conveyor systems
IPC: B65G51/46
Filed: 1929-10-02
Abstract: 337,916. Telephon - Apparat - Fabrik E. Zwietusch & Co., Ges. Nov. 16, 1928, [Convention date]. Discharging and feeding devices for endless-belt conveyers. -In a control arrangement for a conveyer system having a plurality of sending stations in which the destination setting for each carrier is predetermined and is passed on from section to section in the same sequence as the carriers, if a carrier is despatched from an intermediate station, the sequence of the destination settings is altered in the same manner as the sequence of the carriers. The control devices, which are remote from the sending stations, are set by dials of the automatic telephone type. The invention is described as applied to a pneumatic postal tube system with several stations, the apparatus indicated at B (Figs. 1 and 2) and in detail in Fig. 3 being provided at each station. The system is arranged as a closed loop in which the direction of travel is that indicated by the arrow Fig. 1. In each section a magazine y is provided and at each station a delivery tube EB and a despatch tube SB is fitted. The carriers are released to pass through each section singly and carriers stored for despatch in magazine z are not sent unless the magazine y is empty. Contacts yk and zk are operated when carriers are in magazines y and z and contacts ek, ak and dk operate when a carrier arrives, is discharged, or has passed through a section, respectively. Magnet WM is energized when a carrier is to be delivered. The switching devices comprise a number of selectors ES, AS, N1 - - N4 and NZ, the number of switches N being determined by the number of selectors simultaneously passing through a section. When a carrier reaches a section, switch ES steps its wipers on to the next contact and a switch N, say N1, picked up by ESI hunts over its wiper for a marking potential indicating the destination of the carrier passed forward from the preceding station. As other carriers arrive their destinations are stored on switches N2, N3, N4. The carriers are stored in y and as the first is released ASI connects potential over wiper II of N1 either to operate WM to discharge the carrier or to store its designation on one of the switches at the next station. Switch ES1 operates each time a carrier passes dk to move its wipers into engagement with the next register. A carrier to be despatched from B is placed in SB and the identification number of its designation is dialled, setting NZ. When no carriers are held in y the carrier in z is released and its designation is transferred from NZ to one of the registers N<1> whence it is passed on to its destination in the carrier sequence. The circuit arrangements for the transmission of a carrier from station B are shown in Fig. 3. When the carrier enters the magazine z contact zk operates and K energizes. The dial is operated and springs JK intermittently energize J which repeats the. impulses to magnet NZM stepping NZ to the required position. JC pulls up to the first impulse and remains energized throughout the train. When JC falls back T pulls up and W operates lighting lamp BL to indicate that a carrier is awaiting transmission. If no carrier is in course of transmission through the section Sp will be de-energized and N pulls up from interrupter Un1 and energizes M. After a short time the interrupter Un1 operates S and ZM energizes to release the carrier. Contact zk releases and K falls back. Test potential is now applied over the wiper NZII to the conductor indicating the destination of the carrier. As the carrier leaves z contact sk operates and at the next section, which is equipped with apparatus similar to Fig. 3, D pulls up, energizing B and operating ESM to step ES on to the next contacts. When sk releases D falls back and switch N1 starts hunting for the marked line over which P operates to stop hunting and A at the despatching station pulls up. Relays A and P energize during the slow release period of T and when this relay falls away NZ is returned to normal by Un. Relays A and W release and a further carrier may then be stored for despatch. If carriers are waiting in magazine y they are sent in preference to carriers in z. When a carrier arrives in y contact yk pulls up and YM energizes to release the carrier. As the carrier enters the section ek operates and Sp pulls up, breaking the circuit of YM. If the carrier is to be discharged WM operates; if it is to pass on the marking potential is passed forward by NII. When the carrier actuates discharge contact ak or through contact dk relay F responds, stepping AS on to the next contacts and releasing Sp to allow the next carrier to be dealt with.