There is provided a mold clamping apparatus which has a space-saving apparatus construction and can easily carry out mold replacement. In one embodiment of the invention, the retaining means is integrated into the rim of the receptacle and may form an upwardly opening cavity in which replacement liners may be stored, a notch into which a separate storage tray may be fitted and held in place with a slot and tab mechanism, or other similar formations. A current detect circuit portion 36 solely detects all of the voltages supplied to the lamps 21 to 28 inclusive, respectively. The motor is slideably mounted in a retainer for movement parallel to the extendable arm. The detection system utilizes a stripe pattern area filter value that directly exploits the shape of the stripe pattern in the local processing of each pixel in an image to detect the stripe pattern area. The driving pulley, the driven pulley and the drive belt together form a continuously variable transmission.