Abstract: A developing device includes a developer bearer rotatable in a rotation direction and forming a developing range, a holder, and an entrance seal. The holder has a facing face facing the developer bearer upstream from the developing range in the rotation direction, a support face defining a part of an outer face of the developing device, and a relay face extending from one end of the support face to one end of the relay face connected to the facing face to form an acute tip portion closer to the developing range than the one end. The entrance seal has a free end projecting from the one end as a cantilever, and a length of the entrance seal from a tip of the free end of the entrance seal to the one end is shorter than a length of the relay face from the acute tip portion to the one end.

Abstract: An object is to provide a spin welding component that has a simple configuration of a welding surface and provides enhanced welding strength. A spin welding component 1 includes a shaft portion 2 formed in an approximately columnar shape, a flange portion 3 extended outward from below the shaft portion 2 to be formed in a disk-like shape, and an opening 4 formed by opening part of a bottom face of the flange portion 3. A molten resin 9 as molten material is applied on the bottom face. High-speed rotation causes the molten resin 9 to be melted by the frictional heat, and part of the molten resin 9 enters the opening 4 to be welded.

Abstract: A phenol resin foamed plate contains hydrocarbon and/or chlorinated aliphatic hydrocarbon, in which an average cell diameter is in a range of 5 ?m or more and 200 ?m or less, a void area ratio is 5% or less in its cross section, a density is 15 kg/m3 or more and 26 kg/m3 or less, and when compression is made by a 10% displacement in a direction perpendicular to the thickness direction, a recovery rate 1 minute after release of this compression is 96.0% or more and 98.5% or less and a degree of change in recovery rates C is 0.030%/hr or more and 0.060%/hr or less.

Abstract: An object is to provide a spin welding component that has a simple configuration of a welding surface and provides enhanced welding strength. A spin welding component 1 includes a shaft portion 2 formed in an approximately columnar shape, a flange portion 3 extended outward from below the shaft portion 2 to be formed in a disk-like shape, and an opening 4 formed by opening part of a bottom face of the flange portion 3. A molten resin 9 as molten material is applied on the bottom face. High-speed rotation causes the molten resin 9 to be melted by the frictional heat, and part of the molten resin 9 enters the opening 4 to be welded.

Abstract: A phenol resin foamed plate contains hydrocarbon and/or chlorinated aliphatic hydrocarbon, in which an average cell diameter is in a range of 5 ?m or more and 200 ?m or less, a void area ratio is 5% or less in its cross section, a density is 15 kg/m3 or more and 26 kg/m3 or less, and when compression is made by a 10% displacement in a direction perpendicular to the thickness direction, a recovery rate 1 minute after release of this compression is 96.0% or more and 98.5% or less and a degree of change in recovery rates C is 0.030%/hr or more and 0.060%/hr or less.

Abstract: A bill validator is provided which comprises a rotator with a slit and being rotatably attached to the bill validator, the slit being capable of aligning with a passageway when the rotator is in an initial position; a driving device for rotating the rotator; and a validator control circuit for judging authenticity of the bill by outputs of detective sensors and for controlling the driving device. The validator control circuit produces outputs to operate the driving device and thereby to rotate the rotator so as to wind some pulling string connected to the bill around the rotator after the bill passes the slit of the rotator, and the circuit evaluates the rotation rate of the rotator, and detects the unauthorized pulling string.