Abstract: An ultraviolet beam from an ultraviolet radiation source is projected to an object having a fluorescent substance such as an adhesive-applied position on a continuous sheet of paper which is being transported and the luminous emission from the fluorescent substance is detected by light reception elements in a detection unit. In this case, at least more than two light reception elements are provided and the arithmetic process of the value of the output from each of the light reception elements is executed by a control computer disposed in a device main body. The value thus obtained is compared with a comparison value stored in storage means, thereby detecting the failure or the degree of adhesive application. When the failure of adhesive application is detected, an alarm buzzer is actuated while a lamp is turned on.

Abstract: In a combination of a cleaning device of a cylinder of an offset sheet-fed press and a cylinder to be cleaned, the cleaning device is provided with a blade member as a cleaning cloth pressing member against the cylinder to be cleaned, the blade member having a relatively sharp edge pressing the cleaning cloth against the cylinder. The cylinder is an impression cylinder provided with sheet holding grippers projecting over the outer peripheral surface of the impression cylinder. The grippers are protected so as not to directly contact the cleaning cloth under the pressed condition by locating cam members to cover the grippers or by locating a cleaning device moving mechanism in a manner such that when the grippers approach the blade member during the rotation of the impression cylinder, the cleaning device is moved away therefrom.

Abstract: In a one-bath etching process in which gravure cells are formed in the surface of a gravure cylinder with one kind of etching solution having a predetermined density, in order to control the cell depths by suitably selecting the cylinder speed, data is provided by correlating a permeation characteristic which is obtained by an inspecting solution substantially similar in characteristic to the etching solution to that which is obtained by the etching solution, while data is obtained by correlating to cylinder speeds, and these data are compared with data which are obtained from the resist layer of the cylinder which is to be used for printing, to determine the total etching time and the cylinder speeds.