Abstract: A multiple welding gun system includes a plurality of welding guns, simultaneously performing welding operations, mounted to a robot arm of a welding robot and a pitch changing device as a space adjusting device disposed between the plurality of welding guns. The pitch changing device is configured to change a gun pitch so as to adjust a space between the welding guns by rotating one of the welding guns relative to other one of the welding guns to thereby move the welding guns closer to or separate from each other.

Abstract: A multiple welding gun system includes a plurality of welding guns, simultaneously performing welding operations, mounted to a robot arm of a welding robot and a pitch changing device as a space adjusting device disposed between the plurality of welding guns. The pitch changing device is configured to change a gun pitch so as to adjust a space between the welding guns by rotating one of the welding guns relative to other one of the welding guns to thereby move the welding guns closer to or separate from each other.

Abstract: An elevator control system comprises an elevator controller for controlling the running of a cage and a plurality of input/output terminal equipments for controlling devices provided at a landing place on each floor and/or in the cage, each of the elevator controller and the plurality of input/output terminal equipments including a transmission controller provided with a transmission circuit and a reception circuit so that the elevator controller and the plurality of input/output terminal equipments are connected to each other through transmission lines, wherein each of the elevator controller and the plurality of input/output terminal equipments is provided with an abnormality detector for detecting an abnormality and a transmission stopping device for inhibiting transmission through the transmission circuit of its own transmission controller upon detection of occurrence of an abnormality by the abnormality detector.