Iwatsu Electric Company Ltd.

Nobuyoshi Hatori

Toshio Koike

Tamio Iwamoto

Satoshi Okabe

Masanori Kai

Akira Kobashikawa

A printing-plate making apparatus is constructed such that a mode selecting switch adapted to change a master supplying process depending on properties of a master X is disposed on a housing 1 of the printing-plate making apparatus and various conditions, e.g., a master supplying process, locking member 4 for a master supplying roller 3, a temperature preset for a panel heater 33 and a compressing force given by press rollers 35a and 35b are automatically changed to optimal conditions corresponding to masters selected by the mode selecting switch. The printing-plate making apparatus is provided with a master heating switch on the housing 1 of the printing-plate making apparatus and when the master heating switch is actuated, applying of a certain voltage to at least a charger is stopped so that the panel heater 33 arranged at a fixing step is kept in the heated state so as to serve as a master heating unit.

Printing plate making apparatus for two different kinds of masters

A post-processing apparatus for washing off a photosensitive layer in a non-image area of an organic photoconductive master plate that has been prepared on a platemaker through the steps of exposure, development and fixing. The apparatus including a swelling/wetting section for rendering the photosensitive layer in the non-image area swollen and wet; a stripping section for stripping and removing the photosensitive layer; a cleaning section for washing the photosensitive layer with water; solution receiving tanks provided for the respective sections for receiving processing solution; spray pipes provided along a width of the master plate for spraying the processing solution from the solution receiving tanks respectively associated with the swelling/wetting, the stripping and the cleaning sections; and a detector for detecting a temperature of the processing solution. The detector being provided in a rear end of a fluid passageway of the spray pipe in the swelling/wetting section. The apparatus further including an outlet for injecting the processing solution toward the master plate, the outlet being bored in a wall of the rear end portion of the spray pipe facing with a temperature sensing head of the detector; a heater for the processing solution being provided in the solution receiving tank of the swelling/wetting section; and a controller for controlling the heater according to an output signal from the detector.

Post-processing apparatus with solution's temperature detector

A plate making machine of a compact size has a mechanism for dealing with jamming, by which jammed master paper can be easily removed, and the maintenance of an exposure stage and a supply transfer system can be performed without disassembling the machine body. The supply transfer system for feeding the master paper X to the exposure stage 9 is provided in a generally horizontal direction at an upper portion of the plate making machine body 1. A lamp house 13 for projecting the original image is provided above the exposure stage 9. An exposure plate 24 is provided at the exposure stage 9, and the exposure plate is tiltable about tilting shaft 25 provided at the side thereof opposite to the supply transfer system. An endless feed belt 33 for feeding and discharging the master paper X relative to the exposure plate 24 is provided in surrounding relation to the exposure plate 24. A discharge transfer system is provided in a slanting manner below the supply transfer system, and the discharge transfer system takes up the master paper X, subjected to exposure, from the exposure plate 24 so as to develop and fix the latent image when the exposure plate 24 is in a tilted position.

Plate making machine

An electrophotographic plate-making machine including a light source and a movable copy holder forming a scanning exposure system for focusing a light at a focus region. A first electric motor is connected to the copy holder, and a sensitive paper is conveyed by a plurality of conveying rollers. Two of the conveying rollers are arranged at the focus region in series with the remaining conveying rollers. A second electric motor is connected to the conveying rollers and a third electric motor is connected to the focus region rollers. Accordingly, the first, second and third electric drive motors, respectively, can move the copy holder, the conveying rollers and the focus region rollers independently of each other, so that a first scanning exposure can be carried out on one portion of a sensitive paper and a second scanning exposure can be carried out on the remaining portion of the sensitive paper.

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Tokyo, Japan

Nobuyoshi Hatori