Abstract: A furnace assembly for automatically transporting circuit board of varying sizes through a firing chamber and for maintaining heat within the firing chamber and preventing ambient air from entering into the firing chamber by having an adjustable twin-track rail assembly for housing and positioning conveyor belts which secure the circuit boards and by having baffle gate chambers in which a series of baffle gates maintain a constant atmosphere at the open ends of the firing chamber.

Abstract: A tool changing mechanism or assembly for a machine tool, which has a spindle for rotating a tool on an operating axis and has a tool storage magazine having at least one tool receiving means such as a socket for supporting a tool on a storage axis, has an improvement which enables increased distances between the spindle and the storage axis. The improvement is that a tool changing arm is mounted on a housing or a shuttle to rotate about a first axis and the shuttle is mounted on the frame of the machine tool so that it can be moved between two linear positions as the arm is rotated so that the axis of rotation of the arm is shifted in a linear path.