Abstract: A low-cost screen apparatus capable of realizing, with its simple mechanism, a method of obtaining flatness of a screen body that has been difficult to realize with expansion using an upper and lower crossbar for support. A holding member 11 holding an upper end of a screen body is provided inside a tubular crossbar provided to the upper end of the screen body. The holding member 11 is formed of at least three divisions including: a left-end-part holding member 12 that holds a left end part of the screen body and pulls the screen body toward a left end of the crossbar; a right-end-part holding member 13 that holds a right end part of the screen body and pulls the screen body toward a right end of the crossbar; and a central-part holding member 14 that is disposed between the left-end-part holding member 12 and the right-end-part holding member 13 and holds a central part of the screen body.

Abstract: A low-cost screen apparatus capable of realizing, with its simple mechanism, a method of obtaining flatness of a screen body that has been difficult to realize with expansion using an upper and lower crossbar for support. A holding member 11 holding an upper end of a screen body is provided inside a tubular crossbar provided to the upper end of the screen body. The holding member 11 is formed of at least three divisions including: a left-end-part holding member 12 that holds a left end part of the screen body and pulls the screen body toward a left end of the crossbar; a right-end-part holding member 13 that holds a right end part of the screen body and pulls the screen body toward a right end of the crossbar; and a central-part holding member 14 that is disposed between the left-end-part holding member 12 and the right-end-part holding member 13 and holds a central part of the screen body.

Abstract: A tension panel includes a frame, and a retaining device affixed to and retaining respective corners of a display sheet. A stretching and fixing assembly is provided which includes an L-shaped bar formed by two legs joined together to define a bent region of the bar. The legs each have a free end attached to the frame so that the bar is movable from a raised position, through an intermediate position, to a lowered position in which the bar lies essentially flush with the frame. The assembly further includes a resilient member having one end attached to the bent region of the bar, and another end attached to the retaining device for exerting a tensile force on the retaining device when the bar is in the lowered position. The tensile force extends in a direction along an imaginary line that divides an interior angle of the respective corner into two angles, so as to stretch and fix the display sheet on the frame. When the bar is in the raised position, the tensile force is not exerted.

Abstract: An electrostatic notice board system in which characters can be written on the surface while attraction force sufficient to hold objects thereon being maintained. In the system, a hard coating material layer is formed at the surface off the attraction layer consisting of a layered dielectric substance and the back face of the attraction layer is provided with a pair of positive and negative electrodes in the form of comb-teeth, so that the objects such as paper sheets are attracted and held by coulomb force on the surface of the hard coating material layer. The hard coating material layer is, for example, formed by applying acrylic urethane coating material to the surface of the attraction layer and hardening the material with ultraviolet ray irradiation. The hard coating material layer has a volume resistivity of 10.sup.10 .OMEGA. cm or more and thickness of 50 .mu. or less.

Abstract: The object is to prevent the degradation of an attraction layer in an electrostatic attraction board system when objects are attracted for a long time. The electrostatic attraction board system comprises a coating layer disposed over the surface of the attraction layer formed of a layered dielectric substance and a pair of positive/negative comb-teeth like electrodes disposed in a laminating structure on the back face of the attraction layer. Objects such as paper sheets are attracted and held on the surface of the coating layer by coulomb force, The coating layer is formed of a plastic material such as biaxial drawn polyester having a low oxygen permeability and a low vapor permeability, and has a volume resistivity of 10.sup.10 .OMEGA.cm or more and thickness of 5 to 50.mu..

Abstract: An electrostatic attracting sheet which is incorporated in X-Y plotters or the like machines in order to attract drawing papers to a supporting board in the machines while the drawing of any given letters and/or figures is done on the drawing papers, the attracting sheet comprising crystal whiskers of potassium titanate which are coated with a white conductive substance such as tin and are dispersed in plastics sheet at a content such that a volume resitivity of an order of 10.sup.12 to 10.sup.14 .OMEGA..cm is imparted to the sheet, which sheet is made white or light gray due to such white whiskers dispersed therein.

Abstract: The invention relates to a billboard device suitable for use in posting a sheet of advertisement of guide bill, in particular, on the structure of a vehicle. The billboard device eliminates the necessity of using elastic material such as cardboard for sheets or bills and does not impair the design aesthetics of the bills. The billboard device includes an electrostatic attracting plate which has an attracting layer of dielectric material and at least one pair of comb-tooth shaped electrodes formed on the back surface of the attracting layer. The electrostatic attracting plate is warped so that the attracting layer is concave on the front surface. Voltage is applied to central comb-tooth electrodes first, and then the comb-tooth electrodes surrounding the central electrodes.

Abstract: A paper sheet transporting method comprises a step of superposing a paper sheet on a reinforcing sheet and a step of affording an electrostatic attractive force between the sheets due to electrostatic charges given thereto. The reinforcing sheet is made of a substance selected from plastics that are of a highly insulating nature and retain the electrostatic charge for a long period of time so as to have a remaining attractive force. A step of gripping the thus electrostatically charged sheets between a pair of transporting rollers is carried out so as to transport the sheets in a tangential direction of the rollers while the sheets are still sticking to each other. The paper sheet is transported by the reinforcing sheet to a work station therefor without producing any deformation or torsion, and the paper sheet is removed from the reinforcing sheet after being processed at the work station.

Abstract: This invention relates to an electrostatic absorption sheet having an absorption layer, a group of electrodes and an insulation layer integrally connected to each other, wherein the insulation layer is formed by an insulation material having an adhering characteristic and then the insulation layer is reinforced by a core member.