stepping switch การใช้

• The central office switching equipment had a two-motion stepping switch.
• An array of uniselector stepping switches as installed in a telephone exchange.
• The flat track stepping switch was mounted to the transformer.
• Stepping switches are used in a variety of applications, other than telephone systems.
• The 18-step flat track BBC stepping switch was mounted on the transformer.
• The major use of stepping switches was in early automatic telephone exchanges to route telephone calls.
• Initially the stepping switch was controlled by a crank handle, later by a control wheel.
• The selector was similar in effect to a stepping switch though it moved continuously over the contacts.
• Eikichi Suzuki suggested the use of a stepping switch instead of the more troublesome half-rotor switch.
• Sometime around 1964, this was replaced by a second system built around the stepping switches and relays.
• Later stepping switches were arranged in banks, the first stage of which was a " linefinder ".
• One early method was based on the selector principle, and used the switches as functional replacement for Strowger or stepping switches.
• In a uniselector, the stepping switch steps only on one axis, although there are often several sets of contacts in parallel.
• It was possible to operate the stepping switch by hand, but only by someone actually at the switch inside the centre locomotive body.
• A basic stepping switch is an electrically operated rotary switch with a single ( typically input ) terminal, and multiple ( typically output ) terminals.
• Stepping switches were quite noisy in operation ( especially when self-stepping ), because their mechanisms accelerated and stopped quickly to minimize operating time.
• Most stepping switches rotate the wipers in only one direction, but some are bidirectional; the latter have a second magnet to rotate the wipers the other way.
• While some stepping switches have only one pole ( layer of contacts ), a typical switch has more; in the latter case, all wipers are aligned and move together.
• The flat track stepping switch was mounted on the transformer and consisted of 18 steps providing voltages between 237V and 1350V . To suppress sparks during switching, spark switches were used.
• Exhibits include a manual telephone switchboard, a Step-by-Step private automatic branch exchange ( demonstrating the stepping switch principle ), and a phone booth from the 1930s.