The invention comprises novel compounds that are effective in the prophylaxis and treatment of diseases, such as integrin receptors mediated diseases, in particular, diseases or conditions mediated by integrin receptors, such as a \u03b1v\u03b23, \u03b1v\u03b25, \u03b1v\u03b26, \u03b15\u03b21 and the like. The reversing and re-dispensing procedure is repeated to have overlapped sheet members be separated, and the transferring roller set is reversed to move overlapped sheet members backwards and then the machine is shut down for examination if overlapped sheet members still cannot be separated after the reversing and re-dispensing procedure has been repeated a predetermined number of times. The first and second tubes include an annular end via which the tubes are secured to each other so as to preserve the radial elasticity of the first tube. Therefore, deterioration of the light-emitting portion of the laser diode and the photosensitive member can be suppressed.