Dainippon Screen Mfg. Co., Ltd.

Mitsubishi Denki Kabushiki Kaisha

Makoto Yahata

Fumihiko Nishida

Seiji Nanri

A masking device employed for a composer and the like for forming a desired opening portion by covering a glass plate holding an original includes a pair of light intercepting devices for covering the glass plate from the front and rear and left and right directions. One end of each of the light intercepting devices includes a holding portion for holding an end portion of masking sheet for covering the glass plate and a member for defining an opening portion on the glass plate. The holding member and the opening portion defining member in the front and rear directions are provided spaced part from each other in the up and down directions, and the light intercepting device in the left and right directions are posed in an opening portion formed between the holding member and the opening portion defining member of the light intercepting device in the front and rear directions to define the opening portion in left and right directions.

Automatic masking device

A vacuum contact type printing device, for carrying out printing with an original film and a photosensitive material maintained in contact with each other, includes a flexible sheet on which the photosensitive material is placed, a sheet holding portion provided below the sheet, an original holding portion for holding an original facing the sheet, and a sealable exposure chamber containing the sheet, the sheet holding portion and the original holding portion. Switching valves for switching the pressure of the central portion and of the peripheral portions of the sheet holding portion between a reduced pressure and the atmospheric pressure are provided at the central and peripheral portions. A vacuum pump is connected to the exposure chamber to reduce the pressure of the exposure chamber, and a pressure sensor for detecting the pressure in the exposure chamber is provided. The pressure between the sheet and the sheet holding portion is switched by the switching valves successively from the central portion outwardly to peripheral portions and from the reduced pressure to the atmospheric pressure in response to the output from the pressure sensor.

Vacuum contact type printing machine and method of contact therefor

A contact printer includes a printing table for mounting of photosensitive material thereon, a framework for supporting a light-transmitting plate, a packing, a conveyor belt for movement of an original in X and Y-directions, and an air-blowing nozzle and drive means for open and close operation of the framework. The framework is held at a position where it is in a slightly opened state during movement of the original, supported by the blown air in order to prevent the photosensitive material from being damaged and to insure accurate positioning of the original.

Growing community of inventors

Kyoto, Japan

Makoto Yahata