Abstract: A sheet-fed printing press includes a printing section for printing on sheets of paper, a sheet discharge section for discharging sheets of paper printed at the printing section from the printing section, a see-through part provided on the upper side of the sheet discharge section so that the inside of the sheet discharge section can be visually observed therethrough, and a color check table, on which a printed sheet of paper picked up from the sheet discharge section is placed for color checking thereof The color check table is located so as to at least partially cover the see-through part from above. The color check table is designed to be movable in a sheet transfer direction so that an area of the see-through part exposed to the outside on the downstream side of the color check table is increased as the color check table is moved towards an upstream side of the sheet transfer direction.

Abstract: A printing press is provided with a temperature control unit for controlling the temperature of a surface of a printing plate mounted on a plate cylinder by feeding air onto the plate cylinder. A plate-replacement space is provided in a certain region around the plate cylinder for replacement of a printing plate mounted on the plate cylinder with a new one introduced from the outside of the printing press. The temperature control unit is designed to be selectively shifted between a temperature control mode and a space opening mode, in which the temperature control mode enables air to be fed through the plate-replacement space onto the plate cylinder, and the space opening mode makes the plate-replacement space open to the outside of the printing press so that the replacement of a printing plate can be done.

Abstract: A support structure for a blanket cylinder of an offset printing press includes: a first eccentric bearing that is rotatably supported by frames of the offset printing press; a second eccentric bearing that is rotatably supported by the first eccentric bearing so as to rotatably support an shaft of a blanket cylinder; a printing pressure adjustment device that rotates the first eccentric bearing relative to the frames, thereby adjusting a clearance between an impression cylinder and a blanket cylinder; and a throw-on device that rotates the second eccentric bearing relative to the first eccentric bearing, thereby performing throw-on and throw-out operations. In the thus arranged support structure, a throw-on distance of the throw-on device is variable.

Abstract: An air blower/vacuum includes a nozzle, a fan, and a main body. The main body is formed with a vacuum pathway and a blower pathway, located upstream and downstream, respectively, from the fan with respect to the flow of air. The main body is also formed with an attachment hole in fluid communication with both the vacuum pathway and the blower pathway. The attachment hole supports the nozzle rotatable between a vacuum mode orientation and a blower mode orientation. In the vacuum mode orientation, the pathway of the nozzle is in fluid communication with the vacuum pathway. In the blower mode orientation, the pathway of the nozzle is in fluid communication with the blower pathway.

Abstract: There is provided a printing press with a sheet-turning-over-mechanism for turning over a printing sheet, enabling the printing press to be selectively operable in a one-sided printing mode and a double-sided printing mode. The printing press includes a controller which, when any failure stops any one of steps of a mode switching operation for switching the printing press from the one-sided printing mode to the double-sided printing mode or vice versa, stores the information representative of a state of the mode switching operation at the moment of the stop due to the failure, and when a normal operable state is restored from the failure, resumes the mode switching operation from a step of the mode switching operation indicated by the operational state stored therein.

Abstract: An offset printer capable of contacting a plurality of ink rollers of a predetermined ink supply unit with a predetermined plate segment on a plate cylinder, and capable of out of contacting the ink rollers from a remaining plate segment on the plate cylinder. Roller support arms each supporting each ink roller are pivotally movably supported on a frame, and each support arm is moved by each, cam members pivotally movably supported on the frame. Each cam member is in contact with a center cam provided coaxially with and rotatable together with the plate cylinder, so that the ink rollers are successively moved. An interlocking mechanism including a lever is further provided. The lever moves concurrently the cam members to concurrently move the ink rollers.

Abstract: Prior to printing work, the operator of the printing machine selectively inputs a kind of the printing paper (such as one of coated paper, mat-coated paper, and non-coated paper and so on) through a paper-type input portion 17. A CPU 11 controls the supply of ink according to the type of printing paper to be used as a result of controlling one of the operation of ink fountain keys, an ink fountain roller, and an ink ductor roller using an ink fountain key controller 21, an ink fountain roller controller 22, and an ink ductor roller controller 23.

Abstract: A sheet-fed printing press is provided to shorten the operation time thereof for feeding the printing plate on the plate cylinder in a printing operation without the tail edge of the printing plate clamped. For this purpose, the sheet-fed printing press is operable in the standard-sized printing plate feeding mode and the shorter-sized printing plate feeding mode. When the shorter-sized printing plate feeding mode is selected, the plate cylinder is rotated in the forward direction with the leading edge of the printing plate clamped by the first clamp device, so that the printing plate is wound around the plate cylinder. In this operation, the second clamp device is not actuated.

Abstract: A leading edge side shaft 6, a tail edge side shaft 12 and a pulling shaft 14 are interlocked with one another through gears. The gears are rotated by using rotation of the plate cylinder. A leading edge side part 10a of the plate 10 is clamped with a leading edge side clamp 4 in accordance with the rotation of the leading edge side shaft 6. Thereafter, a tail edge side part 10b of the plate 10 disposed on the cylinder surface of the plate cylinder 60 is clamped with a tail edge side clamp 5. The plate 10 is pulled in a plate tensioning direction as a result of moving the tail edge side clamp 5 in the direction of the arrow 90 in accordance with the rotation of the pulling shaft 14.

Abstract: A LED radiates light on a plate held on plate cylinder upon receiving a radiation start signal, so as to form an irradiated area on plate. A photo diode (PD) senses substantially only conventional catoptric light reflected from irradiated area and generates the sensed signal representing the conventional catoptric light intensity. A data processing unit computes the dampening volume based on the sensed signal which is stored in storage device 9, storage device 9 then generates dampening volume signal. The LED is held in such manner that an incident angle of the light in connection with the surface of the irradiated area is made at predetermined angle sufficient for changing the conventional catoptric light intensity sensed by PD in accordance with the dampening volume.

Abstract: An automatic molten metal supplying device capable of supplying the molten metal within a short period of time while maintaining accuracy in a supply amount and preventing dripping of the molten metal from a ladle and temperature decrease of the molten metal during its transferring state even if the transferred molten metal is of a small volume. A molten metal intake/discharge port is formed at a bottom portion of a ladle, and an atmosphere communication/blockage unit is provided which selectively communicates an internal space of the ladle with an atmosphere. After the molten metal is introduced into the ladle through the intake/discharge port, the space is shut off from the atmosphere. A cross-sectional area of the intake/discharge port is in a range of from 28 to 80 mm.sup.2.